Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Infrastructure for profiling code inserted by 'gcc -pg'. |
| 3 | * |
| 4 | * Copyright (C) 2007-2008 Steven Rostedt <srostedt@redhat.com> |
| 5 | * Copyright (C) 2004-2008 Ingo Molnar <mingo@redhat.com> |
| 6 | * |
| 7 | * Originally ported from the -rt patch by: |
| 8 | * Copyright (C) 2007 Arnaldo Carvalho de Melo <acme@redhat.com> |
| 9 | * |
| 10 | * Based on code in the latency_tracer, that is: |
| 11 | * |
| 12 | * Copyright (C) 2004-2006 Ingo Molnar |
| 13 | * Copyright (C) 2004 William Lee Irwin III |
| 14 | */ |
| 15 | |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 16 | #include <linux/stop_machine.h> |
| 17 | #include <linux/clocksource.h> |
| 18 | #include <linux/kallsyms.h> |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 19 | #include <linux/seq_file.h> |
Frederic Weisbecker | 4a2b8dd | 2009-01-14 13:33:27 -0800 | [diff] [blame] | 20 | #include <linux/suspend.h> |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 21 | #include <linux/debugfs.h> |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 22 | #include <linux/hardirq.h> |
Ingo Molnar | 2d8b820 | 2008-02-23 16:55:50 +0100 | [diff] [blame] | 23 | #include <linux/kthread.h> |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 24 | #include <linux/uaccess.h> |
Steven Rostedt | 5855fea | 2011-12-16 19:27:42 -0500 | [diff] [blame] | 25 | #include <linux/bsearch.h> |
Paul Gortmaker | 56d82e0 | 2011-05-26 17:53:52 -0400 | [diff] [blame] | 26 | #include <linux/module.h> |
Ingo Molnar | 2d8b820 | 2008-02-23 16:55:50 +0100 | [diff] [blame] | 27 | #include <linux/ftrace.h> |
Steven Rostedt | b0fc494 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 28 | #include <linux/sysctl.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 29 | #include <linux/slab.h> |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 30 | #include <linux/ctype.h> |
Steven Rostedt | 6895061 | 2011-12-16 17:06:45 -0500 | [diff] [blame] | 31 | #include <linux/sort.h> |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 32 | #include <linux/list.h> |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 33 | #include <linux/hash.h> |
Paul E. McKenney | 3f379b0 | 2010-03-05 15:03:25 -0800 | [diff] [blame] | 34 | #include <linux/rcupdate.h> |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 35 | |
Steven Rostedt | ad8d75f | 2009-04-14 19:39:12 -0400 | [diff] [blame] | 36 | #include <trace/events/sched.h> |
Steven Rostedt | 8aef2d2 | 2009-03-24 01:10:15 -0400 | [diff] [blame] | 37 | |
Steven Rostedt | 2af15d6 | 2009-05-28 13:37:24 -0400 | [diff] [blame] | 38 | #include <asm/setup.h> |
Abhishek Sagar | 395a59d | 2008-06-21 23:47:27 +0530 | [diff] [blame] | 39 | |
Steven Rostedt | 0706f1c | 2009-03-23 23:12:58 -0400 | [diff] [blame] | 40 | #include "trace_output.h" |
Steven Rostedt | bac429f | 2009-03-20 12:50:56 -0400 | [diff] [blame] | 41 | #include "trace_stat.h" |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 42 | |
Steven Rostedt | 6912896 | 2008-10-23 09:33:03 -0400 | [diff] [blame] | 43 | #define FTRACE_WARN_ON(cond) \ |
Steven Rostedt | 0778d9a | 2011-04-29 10:36:31 -0400 | [diff] [blame] | 44 | ({ \ |
| 45 | int ___r = cond; \ |
| 46 | if (WARN_ON(___r)) \ |
Steven Rostedt | 6912896 | 2008-10-23 09:33:03 -0400 | [diff] [blame] | 47 | ftrace_kill(); \ |
Steven Rostedt | 0778d9a | 2011-04-29 10:36:31 -0400 | [diff] [blame] | 48 | ___r; \ |
| 49 | }) |
Steven Rostedt | 6912896 | 2008-10-23 09:33:03 -0400 | [diff] [blame] | 50 | |
| 51 | #define FTRACE_WARN_ON_ONCE(cond) \ |
Steven Rostedt | 0778d9a | 2011-04-29 10:36:31 -0400 | [diff] [blame] | 52 | ({ \ |
| 53 | int ___r = cond; \ |
| 54 | if (WARN_ON_ONCE(___r)) \ |
Steven Rostedt | 6912896 | 2008-10-23 09:33:03 -0400 | [diff] [blame] | 55 | ftrace_kill(); \ |
Steven Rostedt | 0778d9a | 2011-04-29 10:36:31 -0400 | [diff] [blame] | 56 | ___r; \ |
| 57 | }) |
Steven Rostedt | 6912896 | 2008-10-23 09:33:03 -0400 | [diff] [blame] | 58 | |
Steven Rostedt | 8fc0c70 | 2009-02-16 15:28:00 -0500 | [diff] [blame] | 59 | /* hash bits for specific function selection */ |
| 60 | #define FTRACE_HASH_BITS 7 |
| 61 | #define FTRACE_FUNC_HASHSIZE (1 << FTRACE_HASH_BITS) |
Steven Rostedt | 33dc9b1 | 2011-05-02 17:34:47 -0400 | [diff] [blame] | 62 | #define FTRACE_HASH_DEFAULT_BITS 10 |
| 63 | #define FTRACE_HASH_MAX_BITS 12 |
Steven Rostedt | 8fc0c70 | 2009-02-16 15:28:00 -0500 | [diff] [blame] | 64 | |
Jiri Olsa | e248491 | 2012-02-15 15:51:48 +0100 | [diff] [blame] | 65 | #define FL_GLOBAL_CONTROL_MASK (FTRACE_OPS_FL_GLOBAL | FTRACE_OPS_FL_CONTROL) |
| 66 | |
Steven Rostedt | 4eebcc8 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 67 | /* ftrace_enabled is a method to turn ftrace on or off */ |
| 68 | int ftrace_enabled __read_mostly; |
Steven Rostedt | d61f82d | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 69 | static int last_ftrace_enabled; |
Steven Rostedt | b0fc494 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 70 | |
Steven Rostedt | 60a7ecf | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 71 | /* Quick disabling of function tracer. */ |
| 72 | int function_trace_stop; |
| 73 | |
jolsa@redhat.com | 756d17e | 2009-10-13 16:33:52 -0400 | [diff] [blame] | 74 | /* List for set_ftrace_pid's pids. */ |
| 75 | LIST_HEAD(ftrace_pids); |
| 76 | struct ftrace_pid { |
| 77 | struct list_head list; |
| 78 | struct pid *pid; |
| 79 | }; |
| 80 | |
Steven Rostedt | 4eebcc8 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 81 | /* |
| 82 | * ftrace_disabled is set when an anomaly is discovered. |
| 83 | * ftrace_disabled is much stronger than ftrace_enabled. |
| 84 | */ |
| 85 | static int ftrace_disabled __read_mostly; |
| 86 | |
Steven Rostedt | 52baf11 | 2009-02-14 01:15:39 -0500 | [diff] [blame] | 87 | static DEFINE_MUTEX(ftrace_lock); |
Steven Rostedt | b0fc494 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 88 | |
Paul McQuade | bd38c0e | 2011-05-31 20:51:55 +0100 | [diff] [blame] | 89 | static struct ftrace_ops ftrace_list_end __read_mostly = { |
Steven Rostedt | fb9fb01 | 2009-03-25 13:26:41 -0400 | [diff] [blame] | 90 | .func = ftrace_stub, |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 91 | }; |
| 92 | |
Steven Rostedt | b848914 | 2011-05-04 09:27:52 -0400 | [diff] [blame] | 93 | static struct ftrace_ops *ftrace_global_list __read_mostly = &ftrace_list_end; |
Jiri Olsa | e248491 | 2012-02-15 15:51:48 +0100 | [diff] [blame] | 94 | static struct ftrace_ops *ftrace_control_list __read_mostly = &ftrace_list_end; |
Steven Rostedt | b848914 | 2011-05-04 09:27:52 -0400 | [diff] [blame] | 95 | static struct ftrace_ops *ftrace_ops_list __read_mostly = &ftrace_list_end; |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 96 | ftrace_func_t ftrace_trace_function __read_mostly = ftrace_stub; |
Steven Rostedt | 6331c28 | 2011-07-13 15:11:02 -0400 | [diff] [blame] | 97 | static ftrace_func_t __ftrace_trace_function_delay __read_mostly = ftrace_stub; |
Steven Rostedt | 60a7ecf | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 98 | ftrace_func_t __ftrace_trace_function __read_mostly = ftrace_stub; |
Steven Rostedt | df4fc31 | 2008-11-26 00:16:23 -0500 | [diff] [blame] | 99 | ftrace_func_t ftrace_pid_function __read_mostly = ftrace_stub; |
Steven Rostedt | 2b49938 | 2011-05-03 22:49:52 -0400 | [diff] [blame] | 100 | static struct ftrace_ops global_ops; |
Jiri Olsa | e248491 | 2012-02-15 15:51:48 +0100 | [diff] [blame] | 101 | static struct ftrace_ops control_ops; |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 102 | |
Steven Rostedt | b848914 | 2011-05-04 09:27:52 -0400 | [diff] [blame] | 103 | static void |
| 104 | ftrace_ops_list_func(unsigned long ip, unsigned long parent_ip); |
| 105 | |
Paul E. McKenney | 3f379b0 | 2010-03-05 15:03:25 -0800 | [diff] [blame] | 106 | /* |
Steven Rostedt | b848914 | 2011-05-04 09:27:52 -0400 | [diff] [blame] | 107 | * Traverse the ftrace_global_list, invoking all entries. The reason that we |
Paul E. McKenney | 3f379b0 | 2010-03-05 15:03:25 -0800 | [diff] [blame] | 108 | * can use rcu_dereference_raw() is that elements removed from this list |
| 109 | * are simply leaked, so there is no need to interact with a grace-period |
| 110 | * mechanism. The rcu_dereference_raw() calls are needed to handle |
Steven Rostedt | b848914 | 2011-05-04 09:27:52 -0400 | [diff] [blame] | 111 | * concurrent insertions into the ftrace_global_list. |
Paul E. McKenney | 3f379b0 | 2010-03-05 15:03:25 -0800 | [diff] [blame] | 112 | * |
| 113 | * Silly Alpha and silly pointer-speculation compiler optimizations! |
| 114 | */ |
Steven Rostedt | b848914 | 2011-05-04 09:27:52 -0400 | [diff] [blame] | 115 | static void ftrace_global_list_func(unsigned long ip, |
| 116 | unsigned long parent_ip) |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 117 | { |
Steven Rostedt | b1cff0a | 2011-05-25 14:27:43 -0400 | [diff] [blame] | 118 | struct ftrace_ops *op; |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 119 | |
Steven Rostedt | b1cff0a | 2011-05-25 14:27:43 -0400 | [diff] [blame] | 120 | if (unlikely(trace_recursion_test(TRACE_GLOBAL_BIT))) |
| 121 | return; |
| 122 | |
| 123 | trace_recursion_set(TRACE_GLOBAL_BIT); |
| 124 | op = rcu_dereference_raw(ftrace_global_list); /*see above*/ |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 125 | while (op != &ftrace_list_end) { |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 126 | op->func(ip, parent_ip); |
Paul E. McKenney | 3f379b0 | 2010-03-05 15:03:25 -0800 | [diff] [blame] | 127 | op = rcu_dereference_raw(op->next); /*see above*/ |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 128 | }; |
Steven Rostedt | b1cff0a | 2011-05-25 14:27:43 -0400 | [diff] [blame] | 129 | trace_recursion_clear(TRACE_GLOBAL_BIT); |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 130 | } |
| 131 | |
Steven Rostedt | df4fc31 | 2008-11-26 00:16:23 -0500 | [diff] [blame] | 132 | static void ftrace_pid_func(unsigned long ip, unsigned long parent_ip) |
| 133 | { |
Steven Rostedt | 0ef8cde | 2008-12-03 15:36:58 -0500 | [diff] [blame] | 134 | if (!test_tsk_trace_trace(current)) |
Steven Rostedt | df4fc31 | 2008-11-26 00:16:23 -0500 | [diff] [blame] | 135 | return; |
| 136 | |
| 137 | ftrace_pid_function(ip, parent_ip); |
| 138 | } |
| 139 | |
| 140 | static void set_ftrace_pid_function(ftrace_func_t func) |
| 141 | { |
| 142 | /* do not set ftrace_pid_function to itself! */ |
| 143 | if (func != ftrace_pid_func) |
| 144 | ftrace_pid_function = func; |
| 145 | } |
| 146 | |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 147 | /** |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 148 | * clear_ftrace_function - reset the ftrace function |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 149 | * |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 150 | * This NULLs the ftrace function and in essence stops |
| 151 | * tracing. There may be lag |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 152 | */ |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 153 | void clear_ftrace_function(void) |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 154 | { |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 155 | ftrace_trace_function = ftrace_stub; |
Steven Rostedt | 60a7ecf | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 156 | __ftrace_trace_function = ftrace_stub; |
Steven Rostedt | 6331c28 | 2011-07-13 15:11:02 -0400 | [diff] [blame] | 157 | __ftrace_trace_function_delay = ftrace_stub; |
Steven Rostedt | df4fc31 | 2008-11-26 00:16:23 -0500 | [diff] [blame] | 158 | ftrace_pid_function = ftrace_stub; |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 159 | } |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 160 | |
Steven Rostedt | 60a7ecf | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 161 | #ifndef CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST |
| 162 | /* |
| 163 | * For those archs that do not test ftrace_trace_stop in their |
| 164 | * mcount call site, we need to do it from C. |
| 165 | */ |
| 166 | static void ftrace_test_stop_func(unsigned long ip, unsigned long parent_ip) |
| 167 | { |
| 168 | if (function_trace_stop) |
| 169 | return; |
| 170 | |
| 171 | __ftrace_trace_function(ip, parent_ip); |
| 172 | } |
| 173 | #endif |
| 174 | |
Jiri Olsa | e248491 | 2012-02-15 15:51:48 +0100 | [diff] [blame] | 175 | static void control_ops_disable_all(struct ftrace_ops *ops) |
| 176 | { |
| 177 | int cpu; |
| 178 | |
| 179 | for_each_possible_cpu(cpu) |
| 180 | *per_cpu_ptr(ops->disabled, cpu) = 1; |
| 181 | } |
| 182 | |
| 183 | static int control_ops_alloc(struct ftrace_ops *ops) |
| 184 | { |
| 185 | int __percpu *disabled; |
| 186 | |
| 187 | disabled = alloc_percpu(int); |
| 188 | if (!disabled) |
| 189 | return -ENOMEM; |
| 190 | |
| 191 | ops->disabled = disabled; |
| 192 | control_ops_disable_all(ops); |
| 193 | return 0; |
| 194 | } |
| 195 | |
| 196 | static void control_ops_free(struct ftrace_ops *ops) |
| 197 | { |
| 198 | free_percpu(ops->disabled); |
| 199 | } |
| 200 | |
Steven Rostedt | 2b49938 | 2011-05-03 22:49:52 -0400 | [diff] [blame] | 201 | static void update_global_ops(void) |
Steven Rostedt | 491d0dc | 2011-04-27 21:43:36 -0400 | [diff] [blame] | 202 | { |
| 203 | ftrace_func_t func; |
| 204 | |
| 205 | /* |
| 206 | * If there's only one function registered, then call that |
| 207 | * function directly. Otherwise, we need to iterate over the |
| 208 | * registered callers. |
| 209 | */ |
Steven Rostedt | b848914 | 2011-05-04 09:27:52 -0400 | [diff] [blame] | 210 | if (ftrace_global_list == &ftrace_list_end || |
| 211 | ftrace_global_list->next == &ftrace_list_end) |
| 212 | func = ftrace_global_list->func; |
Steven Rostedt | 491d0dc | 2011-04-27 21:43:36 -0400 | [diff] [blame] | 213 | else |
Steven Rostedt | b848914 | 2011-05-04 09:27:52 -0400 | [diff] [blame] | 214 | func = ftrace_global_list_func; |
Steven Rostedt | 491d0dc | 2011-04-27 21:43:36 -0400 | [diff] [blame] | 215 | |
| 216 | /* If we filter on pids, update to use the pid function */ |
| 217 | if (!list_empty(&ftrace_pids)) { |
| 218 | set_ftrace_pid_function(func); |
| 219 | func = ftrace_pid_func; |
| 220 | } |
Steven Rostedt | 2b49938 | 2011-05-03 22:49:52 -0400 | [diff] [blame] | 221 | |
| 222 | global_ops.func = func; |
| 223 | } |
| 224 | |
| 225 | static void update_ftrace_function(void) |
| 226 | { |
| 227 | ftrace_func_t func; |
| 228 | |
| 229 | update_global_ops(); |
| 230 | |
Steven Rostedt | cdbe61b | 2011-05-05 21:14:55 -0400 | [diff] [blame] | 231 | /* |
| 232 | * If we are at the end of the list and this ops is |
| 233 | * not dynamic, then have the mcount trampoline call |
| 234 | * the function directly |
| 235 | */ |
Steven Rostedt | b848914 | 2011-05-04 09:27:52 -0400 | [diff] [blame] | 236 | if (ftrace_ops_list == &ftrace_list_end || |
Steven Rostedt | cdbe61b | 2011-05-05 21:14:55 -0400 | [diff] [blame] | 237 | (ftrace_ops_list->next == &ftrace_list_end && |
| 238 | !(ftrace_ops_list->flags & FTRACE_OPS_FL_DYNAMIC))) |
Steven Rostedt | b848914 | 2011-05-04 09:27:52 -0400 | [diff] [blame] | 239 | func = ftrace_ops_list->func; |
| 240 | else |
| 241 | func = ftrace_ops_list_func; |
Steven Rostedt | 2b49938 | 2011-05-03 22:49:52 -0400 | [diff] [blame] | 242 | |
Steven Rostedt | 491d0dc | 2011-04-27 21:43:36 -0400 | [diff] [blame] | 243 | #ifdef CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST |
| 244 | ftrace_trace_function = func; |
| 245 | #else |
Steven Rostedt | 6331c28 | 2011-07-13 15:11:02 -0400 | [diff] [blame] | 246 | #ifdef CONFIG_DYNAMIC_FTRACE |
| 247 | /* do not update till all functions have been modified */ |
| 248 | __ftrace_trace_function_delay = func; |
| 249 | #else |
Steven Rostedt | 491d0dc | 2011-04-27 21:43:36 -0400 | [diff] [blame] | 250 | __ftrace_trace_function = func; |
Steven Rostedt | 6331c28 | 2011-07-13 15:11:02 -0400 | [diff] [blame] | 251 | #endif |
Rajesh Bhagat | db6544e | 2012-02-17 13:59:15 +0530 | [diff] [blame] | 252 | ftrace_trace_function = |
| 253 | (func == ftrace_stub) ? func : ftrace_test_stop_func; |
Steven Rostedt | 491d0dc | 2011-04-27 21:43:36 -0400 | [diff] [blame] | 254 | #endif |
| 255 | } |
| 256 | |
Steven Rostedt | 2b49938 | 2011-05-03 22:49:52 -0400 | [diff] [blame] | 257 | static void add_ftrace_ops(struct ftrace_ops **list, struct ftrace_ops *ops) |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 258 | { |
Steven Rostedt | 2b49938 | 2011-05-03 22:49:52 -0400 | [diff] [blame] | 259 | ops->next = *list; |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 260 | /* |
Steven Rostedt | b848914 | 2011-05-04 09:27:52 -0400 | [diff] [blame] | 261 | * We are entering ops into the list but another |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 262 | * CPU might be walking that list. We need to make sure |
| 263 | * the ops->next pointer is valid before another CPU sees |
Steven Rostedt | b848914 | 2011-05-04 09:27:52 -0400 | [diff] [blame] | 264 | * the ops pointer included into the list. |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 265 | */ |
Steven Rostedt | 2b49938 | 2011-05-03 22:49:52 -0400 | [diff] [blame] | 266 | rcu_assign_pointer(*list, ops); |
| 267 | } |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 268 | |
Steven Rostedt | 2b49938 | 2011-05-03 22:49:52 -0400 | [diff] [blame] | 269 | static int remove_ftrace_ops(struct ftrace_ops **list, struct ftrace_ops *ops) |
| 270 | { |
| 271 | struct ftrace_ops **p; |
| 272 | |
| 273 | /* |
| 274 | * If we are removing the last function, then simply point |
| 275 | * to the ftrace_stub. |
| 276 | */ |
| 277 | if (*list == ops && ops->next == &ftrace_list_end) { |
| 278 | *list = &ftrace_list_end; |
| 279 | return 0; |
| 280 | } |
| 281 | |
| 282 | for (p = list; *p != &ftrace_list_end; p = &(*p)->next) |
| 283 | if (*p == ops) |
| 284 | break; |
| 285 | |
| 286 | if (*p != ops) |
| 287 | return -1; |
| 288 | |
| 289 | *p = (*p)->next; |
| 290 | return 0; |
| 291 | } |
| 292 | |
Jiri Olsa | e248491 | 2012-02-15 15:51:48 +0100 | [diff] [blame] | 293 | static void add_ftrace_list_ops(struct ftrace_ops **list, |
| 294 | struct ftrace_ops *main_ops, |
| 295 | struct ftrace_ops *ops) |
| 296 | { |
| 297 | int first = *list == &ftrace_list_end; |
| 298 | add_ftrace_ops(list, ops); |
| 299 | if (first) |
| 300 | add_ftrace_ops(&ftrace_ops_list, main_ops); |
| 301 | } |
| 302 | |
| 303 | static int remove_ftrace_list_ops(struct ftrace_ops **list, |
| 304 | struct ftrace_ops *main_ops, |
| 305 | struct ftrace_ops *ops) |
| 306 | { |
| 307 | int ret = remove_ftrace_ops(list, ops); |
| 308 | if (!ret && *list == &ftrace_list_end) |
| 309 | ret = remove_ftrace_ops(&ftrace_ops_list, main_ops); |
| 310 | return ret; |
| 311 | } |
| 312 | |
Steven Rostedt | 2b49938 | 2011-05-03 22:49:52 -0400 | [diff] [blame] | 313 | static int __register_ftrace_function(struct ftrace_ops *ops) |
| 314 | { |
| 315 | if (ftrace_disabled) |
| 316 | return -ENODEV; |
| 317 | |
| 318 | if (FTRACE_WARN_ON(ops == &global_ops)) |
| 319 | return -EINVAL; |
| 320 | |
Steven Rostedt | b848914 | 2011-05-04 09:27:52 -0400 | [diff] [blame] | 321 | if (WARN_ON(ops->flags & FTRACE_OPS_FL_ENABLED)) |
| 322 | return -EBUSY; |
| 323 | |
Jiri Olsa | e248491 | 2012-02-15 15:51:48 +0100 | [diff] [blame] | 324 | /* We don't support both control and global flags set. */ |
| 325 | if ((ops->flags & FL_GLOBAL_CONTROL_MASK) == FL_GLOBAL_CONTROL_MASK) |
| 326 | return -EINVAL; |
| 327 | |
Steven Rostedt | cdbe61b | 2011-05-05 21:14:55 -0400 | [diff] [blame] | 328 | if (!core_kernel_data((unsigned long)ops)) |
| 329 | ops->flags |= FTRACE_OPS_FL_DYNAMIC; |
| 330 | |
Steven Rostedt | b848914 | 2011-05-04 09:27:52 -0400 | [diff] [blame] | 331 | if (ops->flags & FTRACE_OPS_FL_GLOBAL) { |
Jiri Olsa | e248491 | 2012-02-15 15:51:48 +0100 | [diff] [blame] | 332 | add_ftrace_list_ops(&ftrace_global_list, &global_ops, ops); |
Steven Rostedt | b848914 | 2011-05-04 09:27:52 -0400 | [diff] [blame] | 333 | ops->flags |= FTRACE_OPS_FL_ENABLED; |
Jiri Olsa | e248491 | 2012-02-15 15:51:48 +0100 | [diff] [blame] | 334 | } else if (ops->flags & FTRACE_OPS_FL_CONTROL) { |
| 335 | if (control_ops_alloc(ops)) |
| 336 | return -ENOMEM; |
| 337 | add_ftrace_list_ops(&ftrace_control_list, &control_ops, ops); |
Steven Rostedt | b848914 | 2011-05-04 09:27:52 -0400 | [diff] [blame] | 338 | } else |
| 339 | add_ftrace_ops(&ftrace_ops_list, ops); |
| 340 | |
Steven Rostedt | 491d0dc | 2011-04-27 21:43:36 -0400 | [diff] [blame] | 341 | if (ftrace_enabled) |
| 342 | update_ftrace_function(); |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 343 | |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 344 | return 0; |
| 345 | } |
| 346 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 347 | static int __unregister_ftrace_function(struct ftrace_ops *ops) |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 348 | { |
Steven Rostedt | 2b49938 | 2011-05-03 22:49:52 -0400 | [diff] [blame] | 349 | int ret; |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 350 | |
Steven Rostedt | 2b49938 | 2011-05-03 22:49:52 -0400 | [diff] [blame] | 351 | if (ftrace_disabled) |
| 352 | return -ENODEV; |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 353 | |
Steven Rostedt | b848914 | 2011-05-04 09:27:52 -0400 | [diff] [blame] | 354 | if (WARN_ON(!(ops->flags & FTRACE_OPS_FL_ENABLED))) |
| 355 | return -EBUSY; |
| 356 | |
Steven Rostedt | 2b49938 | 2011-05-03 22:49:52 -0400 | [diff] [blame] | 357 | if (FTRACE_WARN_ON(ops == &global_ops)) |
| 358 | return -EINVAL; |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 359 | |
Steven Rostedt | b848914 | 2011-05-04 09:27:52 -0400 | [diff] [blame] | 360 | if (ops->flags & FTRACE_OPS_FL_GLOBAL) { |
Jiri Olsa | e248491 | 2012-02-15 15:51:48 +0100 | [diff] [blame] | 361 | ret = remove_ftrace_list_ops(&ftrace_global_list, |
| 362 | &global_ops, ops); |
Steven Rostedt | b848914 | 2011-05-04 09:27:52 -0400 | [diff] [blame] | 363 | if (!ret) |
| 364 | ops->flags &= ~FTRACE_OPS_FL_ENABLED; |
Jiri Olsa | e248491 | 2012-02-15 15:51:48 +0100 | [diff] [blame] | 365 | } else if (ops->flags & FTRACE_OPS_FL_CONTROL) { |
| 366 | ret = remove_ftrace_list_ops(&ftrace_control_list, |
| 367 | &control_ops, ops); |
| 368 | if (!ret) { |
| 369 | /* |
| 370 | * The ftrace_ops is now removed from the list, |
| 371 | * so there'll be no new users. We must ensure |
| 372 | * all current users are done before we free |
| 373 | * the control data. |
| 374 | */ |
| 375 | synchronize_sched(); |
| 376 | control_ops_free(ops); |
| 377 | } |
Steven Rostedt | b848914 | 2011-05-04 09:27:52 -0400 | [diff] [blame] | 378 | } else |
| 379 | ret = remove_ftrace_ops(&ftrace_ops_list, ops); |
| 380 | |
Steven Rostedt | 2b49938 | 2011-05-03 22:49:52 -0400 | [diff] [blame] | 381 | if (ret < 0) |
| 382 | return ret; |
Steven Rostedt | b848914 | 2011-05-04 09:27:52 -0400 | [diff] [blame] | 383 | |
Steven Rostedt | 491d0dc | 2011-04-27 21:43:36 -0400 | [diff] [blame] | 384 | if (ftrace_enabled) |
| 385 | update_ftrace_function(); |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 386 | |
Steven Rostedt | cdbe61b | 2011-05-05 21:14:55 -0400 | [diff] [blame] | 387 | /* |
| 388 | * Dynamic ops may be freed, we must make sure that all |
| 389 | * callers are done before leaving this function. |
| 390 | */ |
| 391 | if (ops->flags & FTRACE_OPS_FL_DYNAMIC) |
| 392 | synchronize_sched(); |
| 393 | |
Steven Rostedt | e6ea44e | 2009-02-14 01:42:44 -0500 | [diff] [blame] | 394 | return 0; |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 395 | } |
| 396 | |
Steven Rostedt | df4fc31 | 2008-11-26 00:16:23 -0500 | [diff] [blame] | 397 | static void ftrace_update_pid_func(void) |
| 398 | { |
Steven Rostedt | 491d0dc | 2011-04-27 21:43:36 -0400 | [diff] [blame] | 399 | /* Only do something if we are tracing something */ |
Steven Rostedt | df4fc31 | 2008-11-26 00:16:23 -0500 | [diff] [blame] | 400 | if (ftrace_trace_function == ftrace_stub) |
KOSAKI Motohiro | 10dd3eb | 2009-03-06 15:29:04 +0900 | [diff] [blame] | 401 | return; |
Steven Rostedt | df4fc31 | 2008-11-26 00:16:23 -0500 | [diff] [blame] | 402 | |
Steven Rostedt | 491d0dc | 2011-04-27 21:43:36 -0400 | [diff] [blame] | 403 | update_ftrace_function(); |
Steven Rostedt | df4fc31 | 2008-11-26 00:16:23 -0500 | [diff] [blame] | 404 | } |
| 405 | |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 406 | #ifdef CONFIG_FUNCTION_PROFILER |
| 407 | struct ftrace_profile { |
| 408 | struct hlist_node node; |
| 409 | unsigned long ip; |
| 410 | unsigned long counter; |
Steven Rostedt | 0706f1c | 2009-03-23 23:12:58 -0400 | [diff] [blame] | 411 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
| 412 | unsigned long long time; |
Chase Douglas | e330b3b | 2010-04-26 14:02:05 -0400 | [diff] [blame] | 413 | unsigned long long time_squared; |
Steven Rostedt | 0706f1c | 2009-03-23 23:12:58 -0400 | [diff] [blame] | 414 | #endif |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 415 | }; |
| 416 | |
| 417 | struct ftrace_profile_page { |
| 418 | struct ftrace_profile_page *next; |
| 419 | unsigned long index; |
| 420 | struct ftrace_profile records[]; |
| 421 | }; |
| 422 | |
Steven Rostedt | cafb168 | 2009-03-24 20:50:39 -0400 | [diff] [blame] | 423 | struct ftrace_profile_stat { |
| 424 | atomic_t disabled; |
| 425 | struct hlist_head *hash; |
| 426 | struct ftrace_profile_page *pages; |
| 427 | struct ftrace_profile_page *start; |
| 428 | struct tracer_stat stat; |
| 429 | }; |
| 430 | |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 431 | #define PROFILE_RECORDS_SIZE \ |
| 432 | (PAGE_SIZE - offsetof(struct ftrace_profile_page, records)) |
| 433 | |
| 434 | #define PROFILES_PER_PAGE \ |
| 435 | (PROFILE_RECORDS_SIZE / sizeof(struct ftrace_profile)) |
| 436 | |
Steven Rostedt | fb9fb01 | 2009-03-25 13:26:41 -0400 | [diff] [blame] | 437 | static int ftrace_profile_bits __read_mostly; |
| 438 | static int ftrace_profile_enabled __read_mostly; |
| 439 | |
| 440 | /* ftrace_profile_lock - synchronize the enable and disable of the profiler */ |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 441 | static DEFINE_MUTEX(ftrace_profile_lock); |
| 442 | |
Steven Rostedt | cafb168 | 2009-03-24 20:50:39 -0400 | [diff] [blame] | 443 | static DEFINE_PER_CPU(struct ftrace_profile_stat, ftrace_profile_stats); |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 444 | |
| 445 | #define FTRACE_PROFILE_HASH_SIZE 1024 /* must be power of 2 */ |
| 446 | |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 447 | static void * |
| 448 | function_stat_next(void *v, int idx) |
| 449 | { |
| 450 | struct ftrace_profile *rec = v; |
| 451 | struct ftrace_profile_page *pg; |
| 452 | |
| 453 | pg = (struct ftrace_profile_page *)((unsigned long)rec & PAGE_MASK); |
| 454 | |
| 455 | again: |
Li Zefan | 0296e42 | 2009-06-26 11:15:37 +0800 | [diff] [blame] | 456 | if (idx != 0) |
| 457 | rec++; |
| 458 | |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 459 | if ((void *)rec >= (void *)&pg->records[pg->index]) { |
| 460 | pg = pg->next; |
| 461 | if (!pg) |
| 462 | return NULL; |
| 463 | rec = &pg->records[0]; |
| 464 | if (!rec->counter) |
| 465 | goto again; |
| 466 | } |
| 467 | |
| 468 | return rec; |
| 469 | } |
| 470 | |
| 471 | static void *function_stat_start(struct tracer_stat *trace) |
| 472 | { |
Steven Rostedt | cafb168 | 2009-03-24 20:50:39 -0400 | [diff] [blame] | 473 | struct ftrace_profile_stat *stat = |
| 474 | container_of(trace, struct ftrace_profile_stat, stat); |
| 475 | |
| 476 | if (!stat || !stat->start) |
| 477 | return NULL; |
| 478 | |
| 479 | return function_stat_next(&stat->start->records[0], 0); |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 480 | } |
| 481 | |
Steven Rostedt | 0706f1c | 2009-03-23 23:12:58 -0400 | [diff] [blame] | 482 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
| 483 | /* function graph compares on total time */ |
| 484 | static int function_stat_cmp(void *p1, void *p2) |
| 485 | { |
| 486 | struct ftrace_profile *a = p1; |
| 487 | struct ftrace_profile *b = p2; |
| 488 | |
| 489 | if (a->time < b->time) |
| 490 | return -1; |
| 491 | if (a->time > b->time) |
| 492 | return 1; |
| 493 | else |
| 494 | return 0; |
| 495 | } |
| 496 | #else |
| 497 | /* not function graph compares against hits */ |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 498 | static int function_stat_cmp(void *p1, void *p2) |
| 499 | { |
| 500 | struct ftrace_profile *a = p1; |
| 501 | struct ftrace_profile *b = p2; |
| 502 | |
| 503 | if (a->counter < b->counter) |
| 504 | return -1; |
| 505 | if (a->counter > b->counter) |
| 506 | return 1; |
| 507 | else |
| 508 | return 0; |
| 509 | } |
Steven Rostedt | 0706f1c | 2009-03-23 23:12:58 -0400 | [diff] [blame] | 510 | #endif |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 511 | |
| 512 | static int function_stat_headers(struct seq_file *m) |
| 513 | { |
Steven Rostedt | 0706f1c | 2009-03-23 23:12:58 -0400 | [diff] [blame] | 514 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
Steven Rostedt | 34886c8 | 2009-03-25 21:00:47 -0400 | [diff] [blame] | 515 | seq_printf(m, " Function " |
Chase Douglas | e330b3b | 2010-04-26 14:02:05 -0400 | [diff] [blame] | 516 | "Hit Time Avg s^2\n" |
Steven Rostedt | 34886c8 | 2009-03-25 21:00:47 -0400 | [diff] [blame] | 517 | " -------- " |
Chase Douglas | e330b3b | 2010-04-26 14:02:05 -0400 | [diff] [blame] | 518 | "--- ---- --- ---\n"); |
Steven Rostedt | 0706f1c | 2009-03-23 23:12:58 -0400 | [diff] [blame] | 519 | #else |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 520 | seq_printf(m, " Function Hit\n" |
| 521 | " -------- ---\n"); |
Steven Rostedt | 0706f1c | 2009-03-23 23:12:58 -0400 | [diff] [blame] | 522 | #endif |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 523 | return 0; |
| 524 | } |
| 525 | |
| 526 | static int function_stat_show(struct seq_file *m, void *v) |
| 527 | { |
| 528 | struct ftrace_profile *rec = v; |
| 529 | char str[KSYM_SYMBOL_LEN]; |
Li Zefan | 3aaba20 | 2010-08-23 16:50:12 +0800 | [diff] [blame] | 530 | int ret = 0; |
Steven Rostedt | 0706f1c | 2009-03-23 23:12:58 -0400 | [diff] [blame] | 531 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
Steven Rostedt | 34886c8 | 2009-03-25 21:00:47 -0400 | [diff] [blame] | 532 | static struct trace_seq s; |
| 533 | unsigned long long avg; |
Chase Douglas | e330b3b | 2010-04-26 14:02:05 -0400 | [diff] [blame] | 534 | unsigned long long stddev; |
Steven Rostedt | 0706f1c | 2009-03-23 23:12:58 -0400 | [diff] [blame] | 535 | #endif |
Li Zefan | 3aaba20 | 2010-08-23 16:50:12 +0800 | [diff] [blame] | 536 | mutex_lock(&ftrace_profile_lock); |
| 537 | |
| 538 | /* we raced with function_profile_reset() */ |
| 539 | if (unlikely(rec->counter == 0)) { |
| 540 | ret = -EBUSY; |
| 541 | goto out; |
| 542 | } |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 543 | |
| 544 | kallsyms_lookup(rec->ip, NULL, NULL, NULL, str); |
Steven Rostedt | 0706f1c | 2009-03-23 23:12:58 -0400 | [diff] [blame] | 545 | seq_printf(m, " %-30.30s %10lu", str, rec->counter); |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 546 | |
Steven Rostedt | 0706f1c | 2009-03-23 23:12:58 -0400 | [diff] [blame] | 547 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
| 548 | seq_printf(m, " "); |
Steven Rostedt | 34886c8 | 2009-03-25 21:00:47 -0400 | [diff] [blame] | 549 | avg = rec->time; |
| 550 | do_div(avg, rec->counter); |
| 551 | |
Chase Douglas | e330b3b | 2010-04-26 14:02:05 -0400 | [diff] [blame] | 552 | /* Sample standard deviation (s^2) */ |
| 553 | if (rec->counter <= 1) |
| 554 | stddev = 0; |
| 555 | else { |
| 556 | stddev = rec->time_squared - rec->counter * avg * avg; |
| 557 | /* |
| 558 | * Divide only 1000 for ns^2 -> us^2 conversion. |
| 559 | * trace_print_graph_duration will divide 1000 again. |
| 560 | */ |
| 561 | do_div(stddev, (rec->counter - 1) * 1000); |
| 562 | } |
| 563 | |
Steven Rostedt | 34886c8 | 2009-03-25 21:00:47 -0400 | [diff] [blame] | 564 | trace_seq_init(&s); |
| 565 | trace_print_graph_duration(rec->time, &s); |
| 566 | trace_seq_puts(&s, " "); |
| 567 | trace_print_graph_duration(avg, &s); |
Chase Douglas | e330b3b | 2010-04-26 14:02:05 -0400 | [diff] [blame] | 568 | trace_seq_puts(&s, " "); |
| 569 | trace_print_graph_duration(stddev, &s); |
Steven Rostedt | 0706f1c | 2009-03-23 23:12:58 -0400 | [diff] [blame] | 570 | trace_print_seq(m, &s); |
Steven Rostedt | 0706f1c | 2009-03-23 23:12:58 -0400 | [diff] [blame] | 571 | #endif |
| 572 | seq_putc(m, '\n'); |
Li Zefan | 3aaba20 | 2010-08-23 16:50:12 +0800 | [diff] [blame] | 573 | out: |
| 574 | mutex_unlock(&ftrace_profile_lock); |
Steven Rostedt | 0706f1c | 2009-03-23 23:12:58 -0400 | [diff] [blame] | 575 | |
Li Zefan | 3aaba20 | 2010-08-23 16:50:12 +0800 | [diff] [blame] | 576 | return ret; |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 577 | } |
| 578 | |
Steven Rostedt | cafb168 | 2009-03-24 20:50:39 -0400 | [diff] [blame] | 579 | static void ftrace_profile_reset(struct ftrace_profile_stat *stat) |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 580 | { |
| 581 | struct ftrace_profile_page *pg; |
| 582 | |
Steven Rostedt | cafb168 | 2009-03-24 20:50:39 -0400 | [diff] [blame] | 583 | pg = stat->pages = stat->start; |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 584 | |
| 585 | while (pg) { |
| 586 | memset(pg->records, 0, PROFILE_RECORDS_SIZE); |
| 587 | pg->index = 0; |
| 588 | pg = pg->next; |
| 589 | } |
| 590 | |
Steven Rostedt | cafb168 | 2009-03-24 20:50:39 -0400 | [diff] [blame] | 591 | memset(stat->hash, 0, |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 592 | FTRACE_PROFILE_HASH_SIZE * sizeof(struct hlist_head)); |
| 593 | } |
| 594 | |
Steven Rostedt | cafb168 | 2009-03-24 20:50:39 -0400 | [diff] [blame] | 595 | int ftrace_profile_pages_init(struct ftrace_profile_stat *stat) |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 596 | { |
| 597 | struct ftrace_profile_page *pg; |
Steven Rostedt | 318e0a7 | 2009-03-25 20:06:34 -0400 | [diff] [blame] | 598 | int functions; |
| 599 | int pages; |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 600 | int i; |
| 601 | |
| 602 | /* If we already allocated, do nothing */ |
Steven Rostedt | cafb168 | 2009-03-24 20:50:39 -0400 | [diff] [blame] | 603 | if (stat->pages) |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 604 | return 0; |
| 605 | |
Steven Rostedt | cafb168 | 2009-03-24 20:50:39 -0400 | [diff] [blame] | 606 | stat->pages = (void *)get_zeroed_page(GFP_KERNEL); |
| 607 | if (!stat->pages) |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 608 | return -ENOMEM; |
| 609 | |
Steven Rostedt | 318e0a7 | 2009-03-25 20:06:34 -0400 | [diff] [blame] | 610 | #ifdef CONFIG_DYNAMIC_FTRACE |
| 611 | functions = ftrace_update_tot_cnt; |
| 612 | #else |
| 613 | /* |
| 614 | * We do not know the number of functions that exist because |
| 615 | * dynamic tracing is what counts them. With past experience |
| 616 | * we have around 20K functions. That should be more than enough. |
| 617 | * It is highly unlikely we will execute every function in |
| 618 | * the kernel. |
| 619 | */ |
| 620 | functions = 20000; |
| 621 | #endif |
| 622 | |
Steven Rostedt | cafb168 | 2009-03-24 20:50:39 -0400 | [diff] [blame] | 623 | pg = stat->start = stat->pages; |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 624 | |
Steven Rostedt | 318e0a7 | 2009-03-25 20:06:34 -0400 | [diff] [blame] | 625 | pages = DIV_ROUND_UP(functions, PROFILES_PER_PAGE); |
| 626 | |
| 627 | for (i = 0; i < pages; i++) { |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 628 | pg->next = (void *)get_zeroed_page(GFP_KERNEL); |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 629 | if (!pg->next) |
Steven Rostedt | 318e0a7 | 2009-03-25 20:06:34 -0400 | [diff] [blame] | 630 | goto out_free; |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 631 | pg = pg->next; |
| 632 | } |
| 633 | |
| 634 | return 0; |
Steven Rostedt | 318e0a7 | 2009-03-25 20:06:34 -0400 | [diff] [blame] | 635 | |
| 636 | out_free: |
| 637 | pg = stat->start; |
| 638 | while (pg) { |
| 639 | unsigned long tmp = (unsigned long)pg; |
| 640 | |
| 641 | pg = pg->next; |
| 642 | free_page(tmp); |
| 643 | } |
| 644 | |
| 645 | free_page((unsigned long)stat->pages); |
| 646 | stat->pages = NULL; |
| 647 | stat->start = NULL; |
| 648 | |
| 649 | return -ENOMEM; |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 650 | } |
| 651 | |
Steven Rostedt | cafb168 | 2009-03-24 20:50:39 -0400 | [diff] [blame] | 652 | static int ftrace_profile_init_cpu(int cpu) |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 653 | { |
Steven Rostedt | cafb168 | 2009-03-24 20:50:39 -0400 | [diff] [blame] | 654 | struct ftrace_profile_stat *stat; |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 655 | int size; |
| 656 | |
Steven Rostedt | cafb168 | 2009-03-24 20:50:39 -0400 | [diff] [blame] | 657 | stat = &per_cpu(ftrace_profile_stats, cpu); |
| 658 | |
| 659 | if (stat->hash) { |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 660 | /* If the profile is already created, simply reset it */ |
Steven Rostedt | cafb168 | 2009-03-24 20:50:39 -0400 | [diff] [blame] | 661 | ftrace_profile_reset(stat); |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 662 | return 0; |
| 663 | } |
| 664 | |
| 665 | /* |
| 666 | * We are profiling all functions, but usually only a few thousand |
| 667 | * functions are hit. We'll make a hash of 1024 items. |
| 668 | */ |
| 669 | size = FTRACE_PROFILE_HASH_SIZE; |
| 670 | |
Steven Rostedt | cafb168 | 2009-03-24 20:50:39 -0400 | [diff] [blame] | 671 | stat->hash = kzalloc(sizeof(struct hlist_head) * size, GFP_KERNEL); |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 672 | |
Steven Rostedt | cafb168 | 2009-03-24 20:50:39 -0400 | [diff] [blame] | 673 | if (!stat->hash) |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 674 | return -ENOMEM; |
| 675 | |
Steven Rostedt | cafb168 | 2009-03-24 20:50:39 -0400 | [diff] [blame] | 676 | if (!ftrace_profile_bits) { |
| 677 | size--; |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 678 | |
Steven Rostedt | cafb168 | 2009-03-24 20:50:39 -0400 | [diff] [blame] | 679 | for (; size; size >>= 1) |
| 680 | ftrace_profile_bits++; |
| 681 | } |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 682 | |
Steven Rostedt | 318e0a7 | 2009-03-25 20:06:34 -0400 | [diff] [blame] | 683 | /* Preallocate the function profiling pages */ |
Steven Rostedt | cafb168 | 2009-03-24 20:50:39 -0400 | [diff] [blame] | 684 | if (ftrace_profile_pages_init(stat) < 0) { |
| 685 | kfree(stat->hash); |
| 686 | stat->hash = NULL; |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 687 | return -ENOMEM; |
| 688 | } |
| 689 | |
| 690 | return 0; |
| 691 | } |
| 692 | |
Steven Rostedt | cafb168 | 2009-03-24 20:50:39 -0400 | [diff] [blame] | 693 | static int ftrace_profile_init(void) |
| 694 | { |
| 695 | int cpu; |
| 696 | int ret = 0; |
| 697 | |
| 698 | for_each_online_cpu(cpu) { |
| 699 | ret = ftrace_profile_init_cpu(cpu); |
| 700 | if (ret) |
| 701 | break; |
| 702 | } |
| 703 | |
| 704 | return ret; |
| 705 | } |
| 706 | |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 707 | /* interrupts must be disabled */ |
Steven Rostedt | cafb168 | 2009-03-24 20:50:39 -0400 | [diff] [blame] | 708 | static struct ftrace_profile * |
| 709 | ftrace_find_profiled_func(struct ftrace_profile_stat *stat, unsigned long ip) |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 710 | { |
| 711 | struct ftrace_profile *rec; |
| 712 | struct hlist_head *hhd; |
| 713 | struct hlist_node *n; |
| 714 | unsigned long key; |
| 715 | |
| 716 | key = hash_long(ip, ftrace_profile_bits); |
Steven Rostedt | cafb168 | 2009-03-24 20:50:39 -0400 | [diff] [blame] | 717 | hhd = &stat->hash[key]; |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 718 | |
| 719 | if (hlist_empty(hhd)) |
| 720 | return NULL; |
| 721 | |
| 722 | hlist_for_each_entry_rcu(rec, n, hhd, node) { |
| 723 | if (rec->ip == ip) |
| 724 | return rec; |
| 725 | } |
| 726 | |
| 727 | return NULL; |
| 728 | } |
| 729 | |
Steven Rostedt | cafb168 | 2009-03-24 20:50:39 -0400 | [diff] [blame] | 730 | static void ftrace_add_profile(struct ftrace_profile_stat *stat, |
| 731 | struct ftrace_profile *rec) |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 732 | { |
| 733 | unsigned long key; |
| 734 | |
| 735 | key = hash_long(rec->ip, ftrace_profile_bits); |
Steven Rostedt | cafb168 | 2009-03-24 20:50:39 -0400 | [diff] [blame] | 736 | hlist_add_head_rcu(&rec->node, &stat->hash[key]); |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 737 | } |
| 738 | |
Steven Rostedt | 318e0a7 | 2009-03-25 20:06:34 -0400 | [diff] [blame] | 739 | /* |
| 740 | * The memory is already allocated, this simply finds a new record to use. |
| 741 | */ |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 742 | static struct ftrace_profile * |
Steven Rostedt | 318e0a7 | 2009-03-25 20:06:34 -0400 | [diff] [blame] | 743 | ftrace_profile_alloc(struct ftrace_profile_stat *stat, unsigned long ip) |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 744 | { |
| 745 | struct ftrace_profile *rec = NULL; |
| 746 | |
Steven Rostedt | 318e0a7 | 2009-03-25 20:06:34 -0400 | [diff] [blame] | 747 | /* prevent recursion (from NMIs) */ |
Steven Rostedt | cafb168 | 2009-03-24 20:50:39 -0400 | [diff] [blame] | 748 | if (atomic_inc_return(&stat->disabled) != 1) |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 749 | goto out; |
| 750 | |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 751 | /* |
Steven Rostedt | 318e0a7 | 2009-03-25 20:06:34 -0400 | [diff] [blame] | 752 | * Try to find the function again since an NMI |
| 753 | * could have added it |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 754 | */ |
Steven Rostedt | cafb168 | 2009-03-24 20:50:39 -0400 | [diff] [blame] | 755 | rec = ftrace_find_profiled_func(stat, ip); |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 756 | if (rec) |
Steven Rostedt | cafb168 | 2009-03-24 20:50:39 -0400 | [diff] [blame] | 757 | goto out; |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 758 | |
Steven Rostedt | cafb168 | 2009-03-24 20:50:39 -0400 | [diff] [blame] | 759 | if (stat->pages->index == PROFILES_PER_PAGE) { |
| 760 | if (!stat->pages->next) |
| 761 | goto out; |
| 762 | stat->pages = stat->pages->next; |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 763 | } |
| 764 | |
Steven Rostedt | cafb168 | 2009-03-24 20:50:39 -0400 | [diff] [blame] | 765 | rec = &stat->pages->records[stat->pages->index++]; |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 766 | rec->ip = ip; |
Steven Rostedt | cafb168 | 2009-03-24 20:50:39 -0400 | [diff] [blame] | 767 | ftrace_add_profile(stat, rec); |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 768 | |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 769 | out: |
Steven Rostedt | cafb168 | 2009-03-24 20:50:39 -0400 | [diff] [blame] | 770 | atomic_dec(&stat->disabled); |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 771 | |
| 772 | return rec; |
| 773 | } |
| 774 | |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 775 | static void |
| 776 | function_profile_call(unsigned long ip, unsigned long parent_ip) |
| 777 | { |
Steven Rostedt | cafb168 | 2009-03-24 20:50:39 -0400 | [diff] [blame] | 778 | struct ftrace_profile_stat *stat; |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 779 | struct ftrace_profile *rec; |
| 780 | unsigned long flags; |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 781 | |
| 782 | if (!ftrace_profile_enabled) |
| 783 | return; |
| 784 | |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 785 | local_irq_save(flags); |
Steven Rostedt | cafb168 | 2009-03-24 20:50:39 -0400 | [diff] [blame] | 786 | |
| 787 | stat = &__get_cpu_var(ftrace_profile_stats); |
Steven Rostedt | 0f6ce3d | 2009-06-01 21:51:28 -0400 | [diff] [blame] | 788 | if (!stat->hash || !ftrace_profile_enabled) |
Steven Rostedt | cafb168 | 2009-03-24 20:50:39 -0400 | [diff] [blame] | 789 | goto out; |
| 790 | |
| 791 | rec = ftrace_find_profiled_func(stat, ip); |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 792 | if (!rec) { |
Steven Rostedt | 318e0a7 | 2009-03-25 20:06:34 -0400 | [diff] [blame] | 793 | rec = ftrace_profile_alloc(stat, ip); |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 794 | if (!rec) |
| 795 | goto out; |
| 796 | } |
| 797 | |
| 798 | rec->counter++; |
| 799 | out: |
| 800 | local_irq_restore(flags); |
| 801 | } |
| 802 | |
Steven Rostedt | 0706f1c | 2009-03-23 23:12:58 -0400 | [diff] [blame] | 803 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
| 804 | static int profile_graph_entry(struct ftrace_graph_ent *trace) |
| 805 | { |
| 806 | function_profile_call(trace->func, 0); |
| 807 | return 1; |
| 808 | } |
| 809 | |
| 810 | static void profile_graph_return(struct ftrace_graph_ret *trace) |
| 811 | { |
Steven Rostedt | cafb168 | 2009-03-24 20:50:39 -0400 | [diff] [blame] | 812 | struct ftrace_profile_stat *stat; |
Steven Rostedt | a2a16d6 | 2009-03-24 23:17:58 -0400 | [diff] [blame] | 813 | unsigned long long calltime; |
Steven Rostedt | 0706f1c | 2009-03-23 23:12:58 -0400 | [diff] [blame] | 814 | struct ftrace_profile *rec; |
Steven Rostedt | cafb168 | 2009-03-24 20:50:39 -0400 | [diff] [blame] | 815 | unsigned long flags; |
Steven Rostedt | 0706f1c | 2009-03-23 23:12:58 -0400 | [diff] [blame] | 816 | |
| 817 | local_irq_save(flags); |
Steven Rostedt | cafb168 | 2009-03-24 20:50:39 -0400 | [diff] [blame] | 818 | stat = &__get_cpu_var(ftrace_profile_stats); |
Steven Rostedt | 0f6ce3d | 2009-06-01 21:51:28 -0400 | [diff] [blame] | 819 | if (!stat->hash || !ftrace_profile_enabled) |
Steven Rostedt | cafb168 | 2009-03-24 20:50:39 -0400 | [diff] [blame] | 820 | goto out; |
| 821 | |
Steven Rostedt | 37e44bc | 2010-04-27 21:04:24 -0400 | [diff] [blame] | 822 | /* If the calltime was zero'd ignore it */ |
| 823 | if (!trace->calltime) |
| 824 | goto out; |
| 825 | |
Steven Rostedt | a2a16d6 | 2009-03-24 23:17:58 -0400 | [diff] [blame] | 826 | calltime = trace->rettime - trace->calltime; |
| 827 | |
| 828 | if (!(trace_flags & TRACE_ITER_GRAPH_TIME)) { |
| 829 | int index; |
| 830 | |
| 831 | index = trace->depth; |
| 832 | |
| 833 | /* Append this call time to the parent time to subtract */ |
| 834 | if (index) |
| 835 | current->ret_stack[index - 1].subtime += calltime; |
| 836 | |
| 837 | if (current->ret_stack[index].subtime < calltime) |
| 838 | calltime -= current->ret_stack[index].subtime; |
| 839 | else |
| 840 | calltime = 0; |
| 841 | } |
| 842 | |
Steven Rostedt | cafb168 | 2009-03-24 20:50:39 -0400 | [diff] [blame] | 843 | rec = ftrace_find_profiled_func(stat, trace->func); |
Chase Douglas | e330b3b | 2010-04-26 14:02:05 -0400 | [diff] [blame] | 844 | if (rec) { |
Steven Rostedt | a2a16d6 | 2009-03-24 23:17:58 -0400 | [diff] [blame] | 845 | rec->time += calltime; |
Chase Douglas | e330b3b | 2010-04-26 14:02:05 -0400 | [diff] [blame] | 846 | rec->time_squared += calltime * calltime; |
| 847 | } |
Steven Rostedt | a2a16d6 | 2009-03-24 23:17:58 -0400 | [diff] [blame] | 848 | |
Steven Rostedt | cafb168 | 2009-03-24 20:50:39 -0400 | [diff] [blame] | 849 | out: |
Steven Rostedt | 0706f1c | 2009-03-23 23:12:58 -0400 | [diff] [blame] | 850 | local_irq_restore(flags); |
| 851 | } |
| 852 | |
| 853 | static int register_ftrace_profiler(void) |
| 854 | { |
| 855 | return register_ftrace_graph(&profile_graph_return, |
| 856 | &profile_graph_entry); |
| 857 | } |
| 858 | |
| 859 | static void unregister_ftrace_profiler(void) |
| 860 | { |
| 861 | unregister_ftrace_graph(); |
| 862 | } |
| 863 | #else |
Paul McQuade | bd38c0e | 2011-05-31 20:51:55 +0100 | [diff] [blame] | 864 | static struct ftrace_ops ftrace_profile_ops __read_mostly = { |
Steven Rostedt | fb9fb01 | 2009-03-25 13:26:41 -0400 | [diff] [blame] | 865 | .func = function_profile_call, |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 866 | }; |
| 867 | |
Steven Rostedt | 0706f1c | 2009-03-23 23:12:58 -0400 | [diff] [blame] | 868 | static int register_ftrace_profiler(void) |
| 869 | { |
| 870 | return register_ftrace_function(&ftrace_profile_ops); |
| 871 | } |
| 872 | |
| 873 | static void unregister_ftrace_profiler(void) |
| 874 | { |
| 875 | unregister_ftrace_function(&ftrace_profile_ops); |
| 876 | } |
| 877 | #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ |
| 878 | |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 879 | static ssize_t |
| 880 | ftrace_profile_write(struct file *filp, const char __user *ubuf, |
| 881 | size_t cnt, loff_t *ppos) |
| 882 | { |
| 883 | unsigned long val; |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 884 | int ret; |
| 885 | |
Peter Huewe | 22fe9b5 | 2011-06-07 21:58:27 +0200 | [diff] [blame] | 886 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
| 887 | if (ret) |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 888 | return ret; |
| 889 | |
| 890 | val = !!val; |
| 891 | |
| 892 | mutex_lock(&ftrace_profile_lock); |
| 893 | if (ftrace_profile_enabled ^ val) { |
| 894 | if (val) { |
| 895 | ret = ftrace_profile_init(); |
| 896 | if (ret < 0) { |
| 897 | cnt = ret; |
| 898 | goto out; |
| 899 | } |
| 900 | |
Steven Rostedt | 0706f1c | 2009-03-23 23:12:58 -0400 | [diff] [blame] | 901 | ret = register_ftrace_profiler(); |
| 902 | if (ret < 0) { |
| 903 | cnt = ret; |
| 904 | goto out; |
| 905 | } |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 906 | ftrace_profile_enabled = 1; |
| 907 | } else { |
| 908 | ftrace_profile_enabled = 0; |
Steven Rostedt | 0f6ce3d | 2009-06-01 21:51:28 -0400 | [diff] [blame] | 909 | /* |
| 910 | * unregister_ftrace_profiler calls stop_machine |
| 911 | * so this acts like an synchronize_sched. |
| 912 | */ |
Steven Rostedt | 0706f1c | 2009-03-23 23:12:58 -0400 | [diff] [blame] | 913 | unregister_ftrace_profiler(); |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 914 | } |
| 915 | } |
| 916 | out: |
| 917 | mutex_unlock(&ftrace_profile_lock); |
| 918 | |
Jiri Olsa | cf8517c | 2009-10-23 19:36:16 -0400 | [diff] [blame] | 919 | *ppos += cnt; |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 920 | |
| 921 | return cnt; |
| 922 | } |
| 923 | |
| 924 | static ssize_t |
| 925 | ftrace_profile_read(struct file *filp, char __user *ubuf, |
| 926 | size_t cnt, loff_t *ppos) |
| 927 | { |
Steven Rostedt | fb9fb01 | 2009-03-25 13:26:41 -0400 | [diff] [blame] | 928 | char buf[64]; /* big enough to hold a number */ |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 929 | int r; |
| 930 | |
| 931 | r = sprintf(buf, "%u\n", ftrace_profile_enabled); |
| 932 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
| 933 | } |
| 934 | |
| 935 | static const struct file_operations ftrace_profile_fops = { |
| 936 | .open = tracing_open_generic, |
| 937 | .read = ftrace_profile_read, |
| 938 | .write = ftrace_profile_write, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 939 | .llseek = default_llseek, |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 940 | }; |
| 941 | |
Steven Rostedt | cafb168 | 2009-03-24 20:50:39 -0400 | [diff] [blame] | 942 | /* used to initialize the real stat files */ |
| 943 | static struct tracer_stat function_stats __initdata = { |
Steven Rostedt | fb9fb01 | 2009-03-25 13:26:41 -0400 | [diff] [blame] | 944 | .name = "functions", |
| 945 | .stat_start = function_stat_start, |
| 946 | .stat_next = function_stat_next, |
| 947 | .stat_cmp = function_stat_cmp, |
| 948 | .stat_headers = function_stat_headers, |
| 949 | .stat_show = function_stat_show |
Steven Rostedt | cafb168 | 2009-03-24 20:50:39 -0400 | [diff] [blame] | 950 | }; |
| 951 | |
Steven Rostedt | 6ab5d66 | 2009-06-04 00:55:45 -0400 | [diff] [blame] | 952 | static __init void ftrace_profile_debugfs(struct dentry *d_tracer) |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 953 | { |
Steven Rostedt | cafb168 | 2009-03-24 20:50:39 -0400 | [diff] [blame] | 954 | struct ftrace_profile_stat *stat; |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 955 | struct dentry *entry; |
Steven Rostedt | cafb168 | 2009-03-24 20:50:39 -0400 | [diff] [blame] | 956 | char *name; |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 957 | int ret; |
Steven Rostedt | cafb168 | 2009-03-24 20:50:39 -0400 | [diff] [blame] | 958 | int cpu; |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 959 | |
Steven Rostedt | cafb168 | 2009-03-24 20:50:39 -0400 | [diff] [blame] | 960 | for_each_possible_cpu(cpu) { |
| 961 | stat = &per_cpu(ftrace_profile_stats, cpu); |
| 962 | |
| 963 | /* allocate enough for function name + cpu number */ |
| 964 | name = kmalloc(32, GFP_KERNEL); |
| 965 | if (!name) { |
| 966 | /* |
| 967 | * The files created are permanent, if something happens |
| 968 | * we still do not free memory. |
| 969 | */ |
Steven Rostedt | cafb168 | 2009-03-24 20:50:39 -0400 | [diff] [blame] | 970 | WARN(1, |
| 971 | "Could not allocate stat file for cpu %d\n", |
| 972 | cpu); |
| 973 | return; |
| 974 | } |
| 975 | stat->stat = function_stats; |
| 976 | snprintf(name, 32, "function%d", cpu); |
| 977 | stat->stat.name = name; |
| 978 | ret = register_stat_tracer(&stat->stat); |
| 979 | if (ret) { |
| 980 | WARN(1, |
| 981 | "Could not register function stat for cpu %d\n", |
| 982 | cpu); |
| 983 | kfree(name); |
| 984 | return; |
| 985 | } |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 986 | } |
| 987 | |
| 988 | entry = debugfs_create_file("function_profile_enabled", 0644, |
| 989 | d_tracer, NULL, &ftrace_profile_fops); |
| 990 | if (!entry) |
| 991 | pr_warning("Could not create debugfs " |
| 992 | "'function_profile_enabled' entry\n"); |
| 993 | } |
| 994 | |
| 995 | #else /* CONFIG_FUNCTION_PROFILER */ |
Steven Rostedt | 6ab5d66 | 2009-06-04 00:55:45 -0400 | [diff] [blame] | 996 | static __init void ftrace_profile_debugfs(struct dentry *d_tracer) |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 997 | { |
| 998 | } |
| 999 | #endif /* CONFIG_FUNCTION_PROFILER */ |
| 1000 | |
Ingo Molnar | 73d3fd9 | 2009-02-17 11:48:18 +0100 | [diff] [blame] | 1001 | static struct pid * const ftrace_swapper_pid = &init_struct_pid; |
| 1002 | |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1003 | #ifdef CONFIG_DYNAMIC_FTRACE |
Ingo Molnar | 73d3fd9 | 2009-02-17 11:48:18 +0100 | [diff] [blame] | 1004 | |
Steven Rostedt | 99ecdc4 | 2008-08-15 21:40:05 -0400 | [diff] [blame] | 1005 | #ifndef CONFIG_FTRACE_MCOUNT_RECORD |
Steven Rostedt | cb7be3b | 2008-10-23 09:33:05 -0400 | [diff] [blame] | 1006 | # error Dynamic ftrace depends on MCOUNT_RECORD |
Steven Rostedt | 99ecdc4 | 2008-08-15 21:40:05 -0400 | [diff] [blame] | 1007 | #endif |
| 1008 | |
Steven Rostedt | 8fc0c70 | 2009-02-16 15:28:00 -0500 | [diff] [blame] | 1009 | static struct hlist_head ftrace_func_hash[FTRACE_FUNC_HASHSIZE] __read_mostly; |
| 1010 | |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 1011 | struct ftrace_func_probe { |
Steven Rostedt | 8fc0c70 | 2009-02-16 15:28:00 -0500 | [diff] [blame] | 1012 | struct hlist_node node; |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 1013 | struct ftrace_probe_ops *ops; |
Steven Rostedt | 8fc0c70 | 2009-02-16 15:28:00 -0500 | [diff] [blame] | 1014 | unsigned long flags; |
| 1015 | unsigned long ip; |
| 1016 | void *data; |
| 1017 | struct rcu_head rcu; |
| 1018 | }; |
| 1019 | |
Steven Rostedt | b448c4e | 2011-04-29 15:12:32 -0400 | [diff] [blame] | 1020 | struct ftrace_func_entry { |
| 1021 | struct hlist_node hlist; |
| 1022 | unsigned long ip; |
| 1023 | }; |
| 1024 | |
| 1025 | struct ftrace_hash { |
| 1026 | unsigned long size_bits; |
| 1027 | struct hlist_head *buckets; |
| 1028 | unsigned long count; |
Steven Rostedt | 07fd551 | 2011-05-05 18:03:47 -0400 | [diff] [blame] | 1029 | struct rcu_head rcu; |
Steven Rostedt | b448c4e | 2011-04-29 15:12:32 -0400 | [diff] [blame] | 1030 | }; |
| 1031 | |
Steven Rostedt | 33dc9b1 | 2011-05-02 17:34:47 -0400 | [diff] [blame] | 1032 | /* |
| 1033 | * We make these constant because no one should touch them, |
| 1034 | * but they are used as the default "empty hash", to avoid allocating |
| 1035 | * it all the time. These are in a read only section such that if |
| 1036 | * anyone does try to modify it, it will cause an exception. |
| 1037 | */ |
| 1038 | static const struct hlist_head empty_buckets[1]; |
| 1039 | static const struct ftrace_hash empty_hash = { |
| 1040 | .buckets = (struct hlist_head *)empty_buckets, |
Steven Rostedt | b448c4e | 2011-04-29 15:12:32 -0400 | [diff] [blame] | 1041 | }; |
Steven Rostedt | 33dc9b1 | 2011-05-02 17:34:47 -0400 | [diff] [blame] | 1042 | #define EMPTY_HASH ((struct ftrace_hash *)&empty_hash) |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1043 | |
Steven Rostedt | 2b49938 | 2011-05-03 22:49:52 -0400 | [diff] [blame] | 1044 | static struct ftrace_ops global_ops = { |
Steven Rostedt | f45948e | 2011-05-02 12:29:25 -0400 | [diff] [blame] | 1045 | .func = ftrace_stub, |
Steven Rostedt | 33dc9b1 | 2011-05-02 17:34:47 -0400 | [diff] [blame] | 1046 | .notrace_hash = EMPTY_HASH, |
| 1047 | .filter_hash = EMPTY_HASH, |
Steven Rostedt | f45948e | 2011-05-02 12:29:25 -0400 | [diff] [blame] | 1048 | }; |
| 1049 | |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 1050 | static DEFINE_MUTEX(ftrace_regex_lock); |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1051 | |
Steven Rostedt | 3c1720f | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1052 | struct ftrace_page { |
| 1053 | struct ftrace_page *next; |
Steven Rostedt | a790087 | 2011-12-16 16:23:44 -0500 | [diff] [blame] | 1054 | struct dyn_ftrace *records; |
Steven Rostedt | 431aa3f | 2009-01-06 12:43:01 -0500 | [diff] [blame] | 1055 | int index; |
Steven Rostedt | a790087 | 2011-12-16 16:23:44 -0500 | [diff] [blame] | 1056 | int size; |
David Miller | aa5e5ce | 2008-05-13 22:06:56 -0700 | [diff] [blame] | 1057 | }; |
Steven Rostedt | 3c1720f | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1058 | |
Steven Rostedt | 85ae32a | 2011-12-16 16:30:31 -0500 | [diff] [blame] | 1059 | static struct ftrace_page *ftrace_new_pgs; |
| 1060 | |
Steven Rostedt | a790087 | 2011-12-16 16:23:44 -0500 | [diff] [blame] | 1061 | #define ENTRY_SIZE sizeof(struct dyn_ftrace) |
| 1062 | #define ENTRIES_PER_PAGE (PAGE_SIZE / ENTRY_SIZE) |
Steven Rostedt | 3c1720f | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1063 | |
| 1064 | /* estimate from running different kernels */ |
| 1065 | #define NR_TO_INIT 10000 |
| 1066 | |
| 1067 | static struct ftrace_page *ftrace_pages_start; |
| 1068 | static struct ftrace_page *ftrace_pages; |
| 1069 | |
Steven Rostedt | 06a51d9 | 2011-12-19 19:07:36 -0500 | [diff] [blame] | 1070 | static bool ftrace_hash_empty(struct ftrace_hash *hash) |
| 1071 | { |
| 1072 | return !hash || !hash->count; |
| 1073 | } |
| 1074 | |
Steven Rostedt | b448c4e | 2011-04-29 15:12:32 -0400 | [diff] [blame] | 1075 | static struct ftrace_func_entry * |
| 1076 | ftrace_lookup_ip(struct ftrace_hash *hash, unsigned long ip) |
| 1077 | { |
| 1078 | unsigned long key; |
| 1079 | struct ftrace_func_entry *entry; |
| 1080 | struct hlist_head *hhd; |
| 1081 | struct hlist_node *n; |
| 1082 | |
Steven Rostedt | 06a51d9 | 2011-12-19 19:07:36 -0500 | [diff] [blame] | 1083 | if (ftrace_hash_empty(hash)) |
Steven Rostedt | b448c4e | 2011-04-29 15:12:32 -0400 | [diff] [blame] | 1084 | return NULL; |
| 1085 | |
| 1086 | if (hash->size_bits > 0) |
| 1087 | key = hash_long(ip, hash->size_bits); |
| 1088 | else |
| 1089 | key = 0; |
| 1090 | |
| 1091 | hhd = &hash->buckets[key]; |
| 1092 | |
| 1093 | hlist_for_each_entry_rcu(entry, n, hhd, hlist) { |
| 1094 | if (entry->ip == ip) |
| 1095 | return entry; |
| 1096 | } |
| 1097 | return NULL; |
| 1098 | } |
| 1099 | |
Steven Rostedt | 33dc9b1 | 2011-05-02 17:34:47 -0400 | [diff] [blame] | 1100 | static void __add_hash_entry(struct ftrace_hash *hash, |
| 1101 | struct ftrace_func_entry *entry) |
| 1102 | { |
| 1103 | struct hlist_head *hhd; |
| 1104 | unsigned long key; |
| 1105 | |
| 1106 | if (hash->size_bits) |
| 1107 | key = hash_long(entry->ip, hash->size_bits); |
| 1108 | else |
| 1109 | key = 0; |
| 1110 | |
| 1111 | hhd = &hash->buckets[key]; |
| 1112 | hlist_add_head(&entry->hlist, hhd); |
| 1113 | hash->count++; |
| 1114 | } |
| 1115 | |
Steven Rostedt | b448c4e | 2011-04-29 15:12:32 -0400 | [diff] [blame] | 1116 | static int add_hash_entry(struct ftrace_hash *hash, unsigned long ip) |
| 1117 | { |
| 1118 | struct ftrace_func_entry *entry; |
Steven Rostedt | b448c4e | 2011-04-29 15:12:32 -0400 | [diff] [blame] | 1119 | |
| 1120 | entry = kmalloc(sizeof(*entry), GFP_KERNEL); |
| 1121 | if (!entry) |
| 1122 | return -ENOMEM; |
| 1123 | |
Steven Rostedt | b448c4e | 2011-04-29 15:12:32 -0400 | [diff] [blame] | 1124 | entry->ip = ip; |
Steven Rostedt | 33dc9b1 | 2011-05-02 17:34:47 -0400 | [diff] [blame] | 1125 | __add_hash_entry(hash, entry); |
Steven Rostedt | b448c4e | 2011-04-29 15:12:32 -0400 | [diff] [blame] | 1126 | |
| 1127 | return 0; |
| 1128 | } |
| 1129 | |
| 1130 | static void |
Steven Rostedt | 33dc9b1 | 2011-05-02 17:34:47 -0400 | [diff] [blame] | 1131 | free_hash_entry(struct ftrace_hash *hash, |
| 1132 | struct ftrace_func_entry *entry) |
| 1133 | { |
| 1134 | hlist_del(&entry->hlist); |
| 1135 | kfree(entry); |
| 1136 | hash->count--; |
| 1137 | } |
| 1138 | |
| 1139 | static void |
Steven Rostedt | b448c4e | 2011-04-29 15:12:32 -0400 | [diff] [blame] | 1140 | remove_hash_entry(struct ftrace_hash *hash, |
| 1141 | struct ftrace_func_entry *entry) |
| 1142 | { |
| 1143 | hlist_del(&entry->hlist); |
Steven Rostedt | b448c4e | 2011-04-29 15:12:32 -0400 | [diff] [blame] | 1144 | hash->count--; |
| 1145 | } |
| 1146 | |
| 1147 | static void ftrace_hash_clear(struct ftrace_hash *hash) |
| 1148 | { |
| 1149 | struct hlist_head *hhd; |
| 1150 | struct hlist_node *tp, *tn; |
| 1151 | struct ftrace_func_entry *entry; |
| 1152 | int size = 1 << hash->size_bits; |
| 1153 | int i; |
| 1154 | |
Steven Rostedt | 33dc9b1 | 2011-05-02 17:34:47 -0400 | [diff] [blame] | 1155 | if (!hash->count) |
| 1156 | return; |
| 1157 | |
Steven Rostedt | b448c4e | 2011-04-29 15:12:32 -0400 | [diff] [blame] | 1158 | for (i = 0; i < size; i++) { |
| 1159 | hhd = &hash->buckets[i]; |
| 1160 | hlist_for_each_entry_safe(entry, tp, tn, hhd, hlist) |
Steven Rostedt | 33dc9b1 | 2011-05-02 17:34:47 -0400 | [diff] [blame] | 1161 | free_hash_entry(hash, entry); |
Steven Rostedt | b448c4e | 2011-04-29 15:12:32 -0400 | [diff] [blame] | 1162 | } |
| 1163 | FTRACE_WARN_ON(hash->count); |
| 1164 | } |
| 1165 | |
Steven Rostedt | 33dc9b1 | 2011-05-02 17:34:47 -0400 | [diff] [blame] | 1166 | static void free_ftrace_hash(struct ftrace_hash *hash) |
| 1167 | { |
| 1168 | if (!hash || hash == EMPTY_HASH) |
| 1169 | return; |
| 1170 | ftrace_hash_clear(hash); |
| 1171 | kfree(hash->buckets); |
| 1172 | kfree(hash); |
| 1173 | } |
| 1174 | |
Steven Rostedt | 07fd551 | 2011-05-05 18:03:47 -0400 | [diff] [blame] | 1175 | static void __free_ftrace_hash_rcu(struct rcu_head *rcu) |
| 1176 | { |
| 1177 | struct ftrace_hash *hash; |
| 1178 | |
| 1179 | hash = container_of(rcu, struct ftrace_hash, rcu); |
| 1180 | free_ftrace_hash(hash); |
| 1181 | } |
| 1182 | |
| 1183 | static void free_ftrace_hash_rcu(struct ftrace_hash *hash) |
| 1184 | { |
| 1185 | if (!hash || hash == EMPTY_HASH) |
| 1186 | return; |
| 1187 | call_rcu_sched(&hash->rcu, __free_ftrace_hash_rcu); |
| 1188 | } |
| 1189 | |
Jiri Olsa | 5500fa5 | 2012-02-15 15:51:54 +0100 | [diff] [blame] | 1190 | void ftrace_free_filter(struct ftrace_ops *ops) |
| 1191 | { |
| 1192 | free_ftrace_hash(ops->filter_hash); |
| 1193 | free_ftrace_hash(ops->notrace_hash); |
| 1194 | } |
| 1195 | |
Steven Rostedt | 33dc9b1 | 2011-05-02 17:34:47 -0400 | [diff] [blame] | 1196 | static struct ftrace_hash *alloc_ftrace_hash(int size_bits) |
| 1197 | { |
| 1198 | struct ftrace_hash *hash; |
| 1199 | int size; |
| 1200 | |
| 1201 | hash = kzalloc(sizeof(*hash), GFP_KERNEL); |
| 1202 | if (!hash) |
| 1203 | return NULL; |
| 1204 | |
| 1205 | size = 1 << size_bits; |
Thomas Meyer | 47b0edc | 2011-11-29 22:08:00 +0100 | [diff] [blame] | 1206 | hash->buckets = kcalloc(size, sizeof(*hash->buckets), GFP_KERNEL); |
Steven Rostedt | 33dc9b1 | 2011-05-02 17:34:47 -0400 | [diff] [blame] | 1207 | |
| 1208 | if (!hash->buckets) { |
| 1209 | kfree(hash); |
| 1210 | return NULL; |
| 1211 | } |
| 1212 | |
| 1213 | hash->size_bits = size_bits; |
| 1214 | |
| 1215 | return hash; |
| 1216 | } |
| 1217 | |
| 1218 | static struct ftrace_hash * |
| 1219 | alloc_and_copy_ftrace_hash(int size_bits, struct ftrace_hash *hash) |
| 1220 | { |
| 1221 | struct ftrace_func_entry *entry; |
| 1222 | struct ftrace_hash *new_hash; |
| 1223 | struct hlist_node *tp; |
| 1224 | int size; |
| 1225 | int ret; |
| 1226 | int i; |
| 1227 | |
| 1228 | new_hash = alloc_ftrace_hash(size_bits); |
| 1229 | if (!new_hash) |
| 1230 | return NULL; |
| 1231 | |
| 1232 | /* Empty hash? */ |
Steven Rostedt | 06a51d9 | 2011-12-19 19:07:36 -0500 | [diff] [blame] | 1233 | if (ftrace_hash_empty(hash)) |
Steven Rostedt | 33dc9b1 | 2011-05-02 17:34:47 -0400 | [diff] [blame] | 1234 | return new_hash; |
| 1235 | |
| 1236 | size = 1 << hash->size_bits; |
| 1237 | for (i = 0; i < size; i++) { |
| 1238 | hlist_for_each_entry(entry, tp, &hash->buckets[i], hlist) { |
| 1239 | ret = add_hash_entry(new_hash, entry->ip); |
| 1240 | if (ret < 0) |
| 1241 | goto free_hash; |
| 1242 | } |
| 1243 | } |
| 1244 | |
| 1245 | FTRACE_WARN_ON(new_hash->count != hash->count); |
| 1246 | |
| 1247 | return new_hash; |
| 1248 | |
| 1249 | free_hash: |
| 1250 | free_ftrace_hash(new_hash); |
| 1251 | return NULL; |
| 1252 | } |
| 1253 | |
Steven Rostedt | 41fb61c | 2011-07-13 15:03:44 -0400 | [diff] [blame] | 1254 | static void |
| 1255 | ftrace_hash_rec_disable(struct ftrace_ops *ops, int filter_hash); |
| 1256 | static void |
| 1257 | ftrace_hash_rec_enable(struct ftrace_ops *ops, int filter_hash); |
| 1258 | |
Steven Rostedt | 33dc9b1 | 2011-05-02 17:34:47 -0400 | [diff] [blame] | 1259 | static int |
Steven Rostedt | 41fb61c | 2011-07-13 15:03:44 -0400 | [diff] [blame] | 1260 | ftrace_hash_move(struct ftrace_ops *ops, int enable, |
| 1261 | struct ftrace_hash **dst, struct ftrace_hash *src) |
Steven Rostedt | 33dc9b1 | 2011-05-02 17:34:47 -0400 | [diff] [blame] | 1262 | { |
| 1263 | struct ftrace_func_entry *entry; |
| 1264 | struct hlist_node *tp, *tn; |
| 1265 | struct hlist_head *hhd; |
Steven Rostedt | 07fd551 | 2011-05-05 18:03:47 -0400 | [diff] [blame] | 1266 | struct ftrace_hash *old_hash; |
| 1267 | struct ftrace_hash *new_hash; |
Steven Rostedt | 33dc9b1 | 2011-05-02 17:34:47 -0400 | [diff] [blame] | 1268 | unsigned long key; |
| 1269 | int size = src->count; |
| 1270 | int bits = 0; |
Steven Rostedt | 41fb61c | 2011-07-13 15:03:44 -0400 | [diff] [blame] | 1271 | int ret; |
Steven Rostedt | 33dc9b1 | 2011-05-02 17:34:47 -0400 | [diff] [blame] | 1272 | int i; |
| 1273 | |
| 1274 | /* |
Steven Rostedt | 41fb61c | 2011-07-13 15:03:44 -0400 | [diff] [blame] | 1275 | * Remove the current set, update the hash and add |
| 1276 | * them back. |
| 1277 | */ |
| 1278 | ftrace_hash_rec_disable(ops, enable); |
| 1279 | |
| 1280 | /* |
Steven Rostedt | 33dc9b1 | 2011-05-02 17:34:47 -0400 | [diff] [blame] | 1281 | * If the new source is empty, just free dst and assign it |
| 1282 | * the empty_hash. |
| 1283 | */ |
| 1284 | if (!src->count) { |
Steven Rostedt | 07fd551 | 2011-05-05 18:03:47 -0400 | [diff] [blame] | 1285 | free_ftrace_hash_rcu(*dst); |
| 1286 | rcu_assign_pointer(*dst, EMPTY_HASH); |
Steven Rostedt | d4d34b9 | 2011-11-04 20:32:39 -0400 | [diff] [blame] | 1287 | /* still need to update the function records */ |
| 1288 | ret = 0; |
| 1289 | goto out; |
Steven Rostedt | 33dc9b1 | 2011-05-02 17:34:47 -0400 | [diff] [blame] | 1290 | } |
| 1291 | |
Steven Rostedt | 33dc9b1 | 2011-05-02 17:34:47 -0400 | [diff] [blame] | 1292 | /* |
| 1293 | * Make the hash size about 1/2 the # found |
| 1294 | */ |
| 1295 | for (size /= 2; size; size >>= 1) |
| 1296 | bits++; |
| 1297 | |
| 1298 | /* Don't allocate too much */ |
| 1299 | if (bits > FTRACE_HASH_MAX_BITS) |
| 1300 | bits = FTRACE_HASH_MAX_BITS; |
| 1301 | |
Steven Rostedt | 41fb61c | 2011-07-13 15:03:44 -0400 | [diff] [blame] | 1302 | ret = -ENOMEM; |
Steven Rostedt | 07fd551 | 2011-05-05 18:03:47 -0400 | [diff] [blame] | 1303 | new_hash = alloc_ftrace_hash(bits); |
| 1304 | if (!new_hash) |
Steven Rostedt | 41fb61c | 2011-07-13 15:03:44 -0400 | [diff] [blame] | 1305 | goto out; |
Steven Rostedt | 33dc9b1 | 2011-05-02 17:34:47 -0400 | [diff] [blame] | 1306 | |
| 1307 | size = 1 << src->size_bits; |
| 1308 | for (i = 0; i < size; i++) { |
| 1309 | hhd = &src->buckets[i]; |
| 1310 | hlist_for_each_entry_safe(entry, tp, tn, hhd, hlist) { |
| 1311 | if (bits > 0) |
| 1312 | key = hash_long(entry->ip, bits); |
| 1313 | else |
| 1314 | key = 0; |
| 1315 | remove_hash_entry(src, entry); |
Steven Rostedt | 07fd551 | 2011-05-05 18:03:47 -0400 | [diff] [blame] | 1316 | __add_hash_entry(new_hash, entry); |
Steven Rostedt | 33dc9b1 | 2011-05-02 17:34:47 -0400 | [diff] [blame] | 1317 | } |
| 1318 | } |
| 1319 | |
Steven Rostedt | 07fd551 | 2011-05-05 18:03:47 -0400 | [diff] [blame] | 1320 | old_hash = *dst; |
| 1321 | rcu_assign_pointer(*dst, new_hash); |
| 1322 | free_ftrace_hash_rcu(old_hash); |
| 1323 | |
Steven Rostedt | 41fb61c | 2011-07-13 15:03:44 -0400 | [diff] [blame] | 1324 | ret = 0; |
| 1325 | out: |
| 1326 | /* |
| 1327 | * Enable regardless of ret: |
| 1328 | * On success, we enable the new hash. |
| 1329 | * On failure, we re-enable the original hash. |
| 1330 | */ |
| 1331 | ftrace_hash_rec_enable(ops, enable); |
| 1332 | |
| 1333 | return ret; |
Steven Rostedt | 33dc9b1 | 2011-05-02 17:34:47 -0400 | [diff] [blame] | 1334 | } |
| 1335 | |
Steven Rostedt | 265c831 | 2009-02-13 12:43:56 -0500 | [diff] [blame] | 1336 | /* |
Steven Rostedt | b848914 | 2011-05-04 09:27:52 -0400 | [diff] [blame] | 1337 | * Test the hashes for this ops to see if we want to call |
| 1338 | * the ops->func or not. |
| 1339 | * |
| 1340 | * It's a match if the ip is in the ops->filter_hash or |
| 1341 | * the filter_hash does not exist or is empty, |
| 1342 | * AND |
| 1343 | * the ip is not in the ops->notrace_hash. |
Steven Rostedt | cdbe61b | 2011-05-05 21:14:55 -0400 | [diff] [blame] | 1344 | * |
| 1345 | * This needs to be called with preemption disabled as |
| 1346 | * the hashes are freed with call_rcu_sched(). |
Steven Rostedt | b848914 | 2011-05-04 09:27:52 -0400 | [diff] [blame] | 1347 | */ |
| 1348 | static int |
| 1349 | ftrace_ops_test(struct ftrace_ops *ops, unsigned long ip) |
| 1350 | { |
| 1351 | struct ftrace_hash *filter_hash; |
| 1352 | struct ftrace_hash *notrace_hash; |
| 1353 | int ret; |
| 1354 | |
Steven Rostedt | b848914 | 2011-05-04 09:27:52 -0400 | [diff] [blame] | 1355 | filter_hash = rcu_dereference_raw(ops->filter_hash); |
| 1356 | notrace_hash = rcu_dereference_raw(ops->notrace_hash); |
| 1357 | |
Steven Rostedt | 06a51d9 | 2011-12-19 19:07:36 -0500 | [diff] [blame] | 1358 | if ((ftrace_hash_empty(filter_hash) || |
Steven Rostedt | b848914 | 2011-05-04 09:27:52 -0400 | [diff] [blame] | 1359 | ftrace_lookup_ip(filter_hash, ip)) && |
Steven Rostedt | 06a51d9 | 2011-12-19 19:07:36 -0500 | [diff] [blame] | 1360 | (ftrace_hash_empty(notrace_hash) || |
Steven Rostedt | b848914 | 2011-05-04 09:27:52 -0400 | [diff] [blame] | 1361 | !ftrace_lookup_ip(notrace_hash, ip))) |
| 1362 | ret = 1; |
| 1363 | else |
| 1364 | ret = 0; |
Steven Rostedt | b848914 | 2011-05-04 09:27:52 -0400 | [diff] [blame] | 1365 | |
| 1366 | return ret; |
| 1367 | } |
| 1368 | |
| 1369 | /* |
Steven Rostedt | 265c831 | 2009-02-13 12:43:56 -0500 | [diff] [blame] | 1370 | * This is a double for. Do not use 'break' to break out of the loop, |
| 1371 | * you must use a goto. |
| 1372 | */ |
| 1373 | #define do_for_each_ftrace_rec(pg, rec) \ |
| 1374 | for (pg = ftrace_pages_start; pg; pg = pg->next) { \ |
| 1375 | int _____i; \ |
| 1376 | for (_____i = 0; _____i < pg->index; _____i++) { \ |
| 1377 | rec = &pg->records[_____i]; |
| 1378 | |
| 1379 | #define while_for_each_ftrace_rec() \ |
| 1380 | } \ |
| 1381 | } |
Abhishek Sagar | ecea656 | 2008-06-21 23:47:53 +0530 | [diff] [blame] | 1382 | |
Steven Rostedt | 5855fea | 2011-12-16 19:27:42 -0500 | [diff] [blame] | 1383 | |
| 1384 | static int ftrace_cmp_recs(const void *a, const void *b) |
| 1385 | { |
| 1386 | const struct dyn_ftrace *reca = a; |
| 1387 | const struct dyn_ftrace *recb = b; |
| 1388 | |
| 1389 | if (reca->ip > recb->ip) |
| 1390 | return 1; |
| 1391 | if (reca->ip < recb->ip) |
| 1392 | return -1; |
| 1393 | return 0; |
| 1394 | } |
| 1395 | |
Steven Rostedt | c88fd86 | 2011-08-16 09:53:39 -0400 | [diff] [blame] | 1396 | /** |
| 1397 | * ftrace_location - return true if the ip giving is a traced location |
| 1398 | * @ip: the instruction pointer to check |
| 1399 | * |
| 1400 | * Returns 1 if @ip given is a pointer to a ftrace location. |
| 1401 | * That is, the instruction that is either a NOP or call to |
| 1402 | * the function tracer. It checks the ftrace internal tables to |
| 1403 | * determine if the address belongs or not. |
| 1404 | */ |
| 1405 | int ftrace_location(unsigned long ip) |
| 1406 | { |
| 1407 | struct ftrace_page *pg; |
| 1408 | struct dyn_ftrace *rec; |
Steven Rostedt | 5855fea | 2011-12-16 19:27:42 -0500 | [diff] [blame] | 1409 | struct dyn_ftrace key; |
Steven Rostedt | c88fd86 | 2011-08-16 09:53:39 -0400 | [diff] [blame] | 1410 | |
Steven Rostedt | 5855fea | 2011-12-16 19:27:42 -0500 | [diff] [blame] | 1411 | key.ip = ip; |
| 1412 | |
| 1413 | for (pg = ftrace_pages_start; pg; pg = pg->next) { |
| 1414 | rec = bsearch(&key, pg->records, pg->index, |
| 1415 | sizeof(struct dyn_ftrace), |
| 1416 | ftrace_cmp_recs); |
| 1417 | if (rec) |
Steven Rostedt | c88fd86 | 2011-08-16 09:53:39 -0400 | [diff] [blame] | 1418 | return 1; |
Steven Rostedt | 5855fea | 2011-12-16 19:27:42 -0500 | [diff] [blame] | 1419 | } |
Steven Rostedt | c88fd86 | 2011-08-16 09:53:39 -0400 | [diff] [blame] | 1420 | |
| 1421 | return 0; |
| 1422 | } |
| 1423 | |
Steven Rostedt | ed926f9 | 2011-05-03 13:25:24 -0400 | [diff] [blame] | 1424 | static void __ftrace_hash_rec_update(struct ftrace_ops *ops, |
| 1425 | int filter_hash, |
| 1426 | bool inc) |
| 1427 | { |
| 1428 | struct ftrace_hash *hash; |
| 1429 | struct ftrace_hash *other_hash; |
| 1430 | struct ftrace_page *pg; |
| 1431 | struct dyn_ftrace *rec; |
| 1432 | int count = 0; |
| 1433 | int all = 0; |
| 1434 | |
| 1435 | /* Only update if the ops has been registered */ |
| 1436 | if (!(ops->flags & FTRACE_OPS_FL_ENABLED)) |
| 1437 | return; |
| 1438 | |
| 1439 | /* |
| 1440 | * In the filter_hash case: |
| 1441 | * If the count is zero, we update all records. |
| 1442 | * Otherwise we just update the items in the hash. |
| 1443 | * |
| 1444 | * In the notrace_hash case: |
| 1445 | * We enable the update in the hash. |
| 1446 | * As disabling notrace means enabling the tracing, |
| 1447 | * and enabling notrace means disabling, the inc variable |
| 1448 | * gets inversed. |
| 1449 | */ |
| 1450 | if (filter_hash) { |
| 1451 | hash = ops->filter_hash; |
| 1452 | other_hash = ops->notrace_hash; |
Steven Rostedt | 06a51d9 | 2011-12-19 19:07:36 -0500 | [diff] [blame] | 1453 | if (ftrace_hash_empty(hash)) |
Steven Rostedt | ed926f9 | 2011-05-03 13:25:24 -0400 | [diff] [blame] | 1454 | all = 1; |
| 1455 | } else { |
| 1456 | inc = !inc; |
| 1457 | hash = ops->notrace_hash; |
| 1458 | other_hash = ops->filter_hash; |
| 1459 | /* |
| 1460 | * If the notrace hash has no items, |
| 1461 | * then there's nothing to do. |
| 1462 | */ |
Steven Rostedt | 06a51d9 | 2011-12-19 19:07:36 -0500 | [diff] [blame] | 1463 | if (ftrace_hash_empty(hash)) |
Steven Rostedt | ed926f9 | 2011-05-03 13:25:24 -0400 | [diff] [blame] | 1464 | return; |
| 1465 | } |
| 1466 | |
| 1467 | do_for_each_ftrace_rec(pg, rec) { |
| 1468 | int in_other_hash = 0; |
| 1469 | int in_hash = 0; |
| 1470 | int match = 0; |
| 1471 | |
| 1472 | if (all) { |
| 1473 | /* |
| 1474 | * Only the filter_hash affects all records. |
| 1475 | * Update if the record is not in the notrace hash. |
| 1476 | */ |
Steven Rostedt | b848914 | 2011-05-04 09:27:52 -0400 | [diff] [blame] | 1477 | if (!other_hash || !ftrace_lookup_ip(other_hash, rec->ip)) |
Steven Rostedt | ed926f9 | 2011-05-03 13:25:24 -0400 | [diff] [blame] | 1478 | match = 1; |
| 1479 | } else { |
Steven Rostedt | 06a51d9 | 2011-12-19 19:07:36 -0500 | [diff] [blame] | 1480 | in_hash = !!ftrace_lookup_ip(hash, rec->ip); |
| 1481 | in_other_hash = !!ftrace_lookup_ip(other_hash, rec->ip); |
Steven Rostedt | ed926f9 | 2011-05-03 13:25:24 -0400 | [diff] [blame] | 1482 | |
| 1483 | /* |
| 1484 | * |
| 1485 | */ |
| 1486 | if (filter_hash && in_hash && !in_other_hash) |
| 1487 | match = 1; |
| 1488 | else if (!filter_hash && in_hash && |
Steven Rostedt | 06a51d9 | 2011-12-19 19:07:36 -0500 | [diff] [blame] | 1489 | (in_other_hash || ftrace_hash_empty(other_hash))) |
Steven Rostedt | ed926f9 | 2011-05-03 13:25:24 -0400 | [diff] [blame] | 1490 | match = 1; |
| 1491 | } |
| 1492 | if (!match) |
| 1493 | continue; |
| 1494 | |
| 1495 | if (inc) { |
| 1496 | rec->flags++; |
| 1497 | if (FTRACE_WARN_ON((rec->flags & ~FTRACE_FL_MASK) == FTRACE_REF_MAX)) |
| 1498 | return; |
| 1499 | } else { |
| 1500 | if (FTRACE_WARN_ON((rec->flags & ~FTRACE_FL_MASK) == 0)) |
| 1501 | return; |
| 1502 | rec->flags--; |
| 1503 | } |
| 1504 | count++; |
| 1505 | /* Shortcut, if we handled all records, we are done. */ |
| 1506 | if (!all && count == hash->count) |
| 1507 | return; |
| 1508 | } while_for_each_ftrace_rec(); |
| 1509 | } |
| 1510 | |
| 1511 | static void ftrace_hash_rec_disable(struct ftrace_ops *ops, |
| 1512 | int filter_hash) |
| 1513 | { |
| 1514 | __ftrace_hash_rec_update(ops, filter_hash, 0); |
| 1515 | } |
| 1516 | |
| 1517 | static void ftrace_hash_rec_enable(struct ftrace_ops *ops, |
| 1518 | int filter_hash) |
| 1519 | { |
| 1520 | __ftrace_hash_rec_update(ops, filter_hash, 1); |
| 1521 | } |
| 1522 | |
Steven Rostedt | 05736a4 | 2008-09-22 14:55:47 -0700 | [diff] [blame] | 1523 | static void print_ip_ins(const char *fmt, unsigned char *p) |
| 1524 | { |
| 1525 | int i; |
| 1526 | |
| 1527 | printk(KERN_CONT "%s", fmt); |
| 1528 | |
| 1529 | for (i = 0; i < MCOUNT_INSN_SIZE; i++) |
| 1530 | printk(KERN_CONT "%s%02x", i ? ":" : "", p[i]); |
| 1531 | } |
| 1532 | |
Steven Rostedt | c88fd86 | 2011-08-16 09:53:39 -0400 | [diff] [blame] | 1533 | /** |
| 1534 | * ftrace_bug - report and shutdown function tracer |
| 1535 | * @failed: The failed type (EFAULT, EINVAL, EPERM) |
| 1536 | * @ip: The address that failed |
| 1537 | * |
| 1538 | * The arch code that enables or disables the function tracing |
| 1539 | * can call ftrace_bug() when it has detected a problem in |
| 1540 | * modifying the code. @failed should be one of either: |
| 1541 | * EFAULT - if the problem happens on reading the @ip address |
| 1542 | * EINVAL - if what is read at @ip is not what was expected |
| 1543 | * EPERM - if the problem happens on writting to the @ip address |
| 1544 | */ |
| 1545 | void ftrace_bug(int failed, unsigned long ip) |
Steven Rostedt | b17e8a3 | 2008-11-14 16:21:19 -0800 | [diff] [blame] | 1546 | { |
| 1547 | switch (failed) { |
| 1548 | case -EFAULT: |
| 1549 | FTRACE_WARN_ON_ONCE(1); |
| 1550 | pr_info("ftrace faulted on modifying "); |
| 1551 | print_ip_sym(ip); |
| 1552 | break; |
| 1553 | case -EINVAL: |
| 1554 | FTRACE_WARN_ON_ONCE(1); |
| 1555 | pr_info("ftrace failed to modify "); |
| 1556 | print_ip_sym(ip); |
Steven Rostedt | b17e8a3 | 2008-11-14 16:21:19 -0800 | [diff] [blame] | 1557 | print_ip_ins(" actual: ", (unsigned char *)ip); |
Steven Rostedt | b17e8a3 | 2008-11-14 16:21:19 -0800 | [diff] [blame] | 1558 | printk(KERN_CONT "\n"); |
| 1559 | break; |
| 1560 | case -EPERM: |
| 1561 | FTRACE_WARN_ON_ONCE(1); |
| 1562 | pr_info("ftrace faulted on writing "); |
| 1563 | print_ip_sym(ip); |
| 1564 | break; |
| 1565 | default: |
| 1566 | FTRACE_WARN_ON_ONCE(1); |
| 1567 | pr_info("ftrace faulted on unknown error "); |
| 1568 | print_ip_sym(ip); |
| 1569 | } |
| 1570 | } |
| 1571 | |
Steven Rostedt | 3c1720f | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1572 | |
Masami Hiramatsu | 2cfa197 | 2010-02-02 16:49:11 -0500 | [diff] [blame] | 1573 | /* Return 1 if the address range is reserved for ftrace */ |
| 1574 | int ftrace_text_reserved(void *start, void *end) |
| 1575 | { |
| 1576 | struct dyn_ftrace *rec; |
| 1577 | struct ftrace_page *pg; |
| 1578 | |
| 1579 | do_for_each_ftrace_rec(pg, rec) { |
| 1580 | if (rec->ip <= (unsigned long)end && |
| 1581 | rec->ip + MCOUNT_INSN_SIZE > (unsigned long)start) |
| 1582 | return 1; |
| 1583 | } while_for_each_ftrace_rec(); |
| 1584 | return 0; |
| 1585 | } |
| 1586 | |
Steven Rostedt | c88fd86 | 2011-08-16 09:53:39 -0400 | [diff] [blame] | 1587 | static int ftrace_check_record(struct dyn_ftrace *rec, int enable, int update) |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1588 | { |
Xiao Guangrong | 64fbcd1 | 2009-07-15 12:32:15 +0800 | [diff] [blame] | 1589 | unsigned long flag = 0UL; |
Frederic Weisbecker | e7d3737 | 2008-11-16 06:02:06 +0100 | [diff] [blame] | 1590 | |
Steven Rostedt | 982c350 | 2008-11-15 16:31:41 -0500 | [diff] [blame] | 1591 | /* |
Jiri Olsa | 30fb6aa | 2011-12-05 18:22:48 +0100 | [diff] [blame] | 1592 | * If we are updating calls: |
Steven Rostedt | 982c350 | 2008-11-15 16:31:41 -0500 | [diff] [blame] | 1593 | * |
Steven Rostedt | ed926f9 | 2011-05-03 13:25:24 -0400 | [diff] [blame] | 1594 | * If the record has a ref count, then we need to enable it |
| 1595 | * because someone is using it. |
Steven Rostedt | 982c350 | 2008-11-15 16:31:41 -0500 | [diff] [blame] | 1596 | * |
Steven Rostedt | ed926f9 | 2011-05-03 13:25:24 -0400 | [diff] [blame] | 1597 | * Otherwise we make sure its disabled. |
| 1598 | * |
Jiri Olsa | 30fb6aa | 2011-12-05 18:22:48 +0100 | [diff] [blame] | 1599 | * If we are disabling calls, then disable all records that |
Steven Rostedt | ed926f9 | 2011-05-03 13:25:24 -0400 | [diff] [blame] | 1600 | * are enabled. |
Steven Rostedt | 982c350 | 2008-11-15 16:31:41 -0500 | [diff] [blame] | 1601 | */ |
Steven Rostedt | c88fd86 | 2011-08-16 09:53:39 -0400 | [diff] [blame] | 1602 | if (enable && (rec->flags & ~FTRACE_FL_MASK)) |
Steven Rostedt | ed926f9 | 2011-05-03 13:25:24 -0400 | [diff] [blame] | 1603 | flag = FTRACE_FL_ENABLED; |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1604 | |
Xiao Guangrong | 64fbcd1 | 2009-07-15 12:32:15 +0800 | [diff] [blame] | 1605 | /* If the state of this record hasn't changed, then do nothing */ |
| 1606 | if ((rec->flags & FTRACE_FL_ENABLED) == flag) |
Steven Rostedt | c88fd86 | 2011-08-16 09:53:39 -0400 | [diff] [blame] | 1607 | return FTRACE_UPDATE_IGNORE; |
Xiao Guangrong | 64fbcd1 | 2009-07-15 12:32:15 +0800 | [diff] [blame] | 1608 | |
| 1609 | if (flag) { |
Steven Rostedt | c88fd86 | 2011-08-16 09:53:39 -0400 | [diff] [blame] | 1610 | if (update) |
| 1611 | rec->flags |= FTRACE_FL_ENABLED; |
| 1612 | return FTRACE_UPDATE_MAKE_CALL; |
Xiao Guangrong | 64fbcd1 | 2009-07-15 12:32:15 +0800 | [diff] [blame] | 1613 | } |
| 1614 | |
Steven Rostedt | c88fd86 | 2011-08-16 09:53:39 -0400 | [diff] [blame] | 1615 | if (update) |
| 1616 | rec->flags &= ~FTRACE_FL_ENABLED; |
| 1617 | |
| 1618 | return FTRACE_UPDATE_MAKE_NOP; |
| 1619 | } |
| 1620 | |
| 1621 | /** |
| 1622 | * ftrace_update_record, set a record that now is tracing or not |
| 1623 | * @rec: the record to update |
| 1624 | * @enable: set to 1 if the record is tracing, zero to force disable |
| 1625 | * |
| 1626 | * The records that represent all functions that can be traced need |
| 1627 | * to be updated when tracing has been enabled. |
| 1628 | */ |
| 1629 | int ftrace_update_record(struct dyn_ftrace *rec, int enable) |
| 1630 | { |
| 1631 | return ftrace_check_record(rec, enable, 1); |
| 1632 | } |
| 1633 | |
| 1634 | /** |
| 1635 | * ftrace_test_record, check if the record has been enabled or not |
| 1636 | * @rec: the record to test |
| 1637 | * @enable: set to 1 to check if enabled, 0 if it is disabled |
| 1638 | * |
| 1639 | * The arch code may need to test if a record is already set to |
| 1640 | * tracing to determine how to modify the function code that it |
| 1641 | * represents. |
| 1642 | */ |
| 1643 | int ftrace_test_record(struct dyn_ftrace *rec, int enable) |
| 1644 | { |
| 1645 | return ftrace_check_record(rec, enable, 0); |
| 1646 | } |
| 1647 | |
| 1648 | static int |
| 1649 | __ftrace_replace_code(struct dyn_ftrace *rec, int enable) |
| 1650 | { |
| 1651 | unsigned long ftrace_addr; |
| 1652 | int ret; |
| 1653 | |
| 1654 | ftrace_addr = (unsigned long)FTRACE_ADDR; |
| 1655 | |
| 1656 | ret = ftrace_update_record(rec, enable); |
| 1657 | |
| 1658 | switch (ret) { |
| 1659 | case FTRACE_UPDATE_IGNORE: |
| 1660 | return 0; |
| 1661 | |
| 1662 | case FTRACE_UPDATE_MAKE_CALL: |
| 1663 | return ftrace_make_call(rec, ftrace_addr); |
| 1664 | |
| 1665 | case FTRACE_UPDATE_MAKE_NOP: |
| 1666 | return ftrace_make_nop(NULL, rec, ftrace_addr); |
| 1667 | } |
| 1668 | |
| 1669 | return -1; /* unknow ftrace bug */ |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1670 | } |
| 1671 | |
Jiri Olsa | 30fb6aa | 2011-12-05 18:22:48 +0100 | [diff] [blame] | 1672 | static void ftrace_replace_code(int update) |
Steven Rostedt | 3c1720f | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1673 | { |
Steven Rostedt | 3c1720f | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1674 | struct dyn_ftrace *rec; |
| 1675 | struct ftrace_page *pg; |
Steven Rostedt | 6a24a24 | 2009-02-17 11:20:26 -0500 | [diff] [blame] | 1676 | int failed; |
Steven Rostedt | 3c1720f | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1677 | |
Steven Rostedt | 45a4a23 | 2011-04-21 23:16:46 -0400 | [diff] [blame] | 1678 | if (unlikely(ftrace_disabled)) |
| 1679 | return; |
| 1680 | |
Steven Rostedt | 265c831 | 2009-02-13 12:43:56 -0500 | [diff] [blame] | 1681 | do_for_each_ftrace_rec(pg, rec) { |
Jiri Olsa | 30fb6aa | 2011-12-05 18:22:48 +0100 | [diff] [blame] | 1682 | failed = __ftrace_replace_code(rec, update); |
Zhaolei | fa9d13c | 2009-03-13 17:16:34 +0800 | [diff] [blame] | 1683 | if (failed) { |
Steven Rostedt | 3279ba3 | 2009-10-07 16:57:56 -0400 | [diff] [blame] | 1684 | ftrace_bug(failed, rec->ip); |
| 1685 | /* Stop processing */ |
| 1686 | return; |
Steven Rostedt | 265c831 | 2009-02-13 12:43:56 -0500 | [diff] [blame] | 1687 | } |
| 1688 | } while_for_each_ftrace_rec(); |
Steven Rostedt | 3c1720f | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1689 | } |
| 1690 | |
Steven Rostedt | c88fd86 | 2011-08-16 09:53:39 -0400 | [diff] [blame] | 1691 | struct ftrace_rec_iter { |
| 1692 | struct ftrace_page *pg; |
| 1693 | int index; |
| 1694 | }; |
| 1695 | |
| 1696 | /** |
| 1697 | * ftrace_rec_iter_start, start up iterating over traced functions |
| 1698 | * |
| 1699 | * Returns an iterator handle that is used to iterate over all |
| 1700 | * the records that represent address locations where functions |
| 1701 | * are traced. |
| 1702 | * |
| 1703 | * May return NULL if no records are available. |
| 1704 | */ |
| 1705 | struct ftrace_rec_iter *ftrace_rec_iter_start(void) |
| 1706 | { |
| 1707 | /* |
| 1708 | * We only use a single iterator. |
| 1709 | * Protected by the ftrace_lock mutex. |
| 1710 | */ |
| 1711 | static struct ftrace_rec_iter ftrace_rec_iter; |
| 1712 | struct ftrace_rec_iter *iter = &ftrace_rec_iter; |
| 1713 | |
| 1714 | iter->pg = ftrace_pages_start; |
| 1715 | iter->index = 0; |
| 1716 | |
| 1717 | /* Could have empty pages */ |
| 1718 | while (iter->pg && !iter->pg->index) |
| 1719 | iter->pg = iter->pg->next; |
| 1720 | |
| 1721 | if (!iter->pg) |
| 1722 | return NULL; |
| 1723 | |
| 1724 | return iter; |
| 1725 | } |
| 1726 | |
| 1727 | /** |
| 1728 | * ftrace_rec_iter_next, get the next record to process. |
| 1729 | * @iter: The handle to the iterator. |
| 1730 | * |
| 1731 | * Returns the next iterator after the given iterator @iter. |
| 1732 | */ |
| 1733 | struct ftrace_rec_iter *ftrace_rec_iter_next(struct ftrace_rec_iter *iter) |
| 1734 | { |
| 1735 | iter->index++; |
| 1736 | |
| 1737 | if (iter->index >= iter->pg->index) { |
| 1738 | iter->pg = iter->pg->next; |
| 1739 | iter->index = 0; |
| 1740 | |
| 1741 | /* Could have empty pages */ |
| 1742 | while (iter->pg && !iter->pg->index) |
| 1743 | iter->pg = iter->pg->next; |
| 1744 | } |
| 1745 | |
| 1746 | if (!iter->pg) |
| 1747 | return NULL; |
| 1748 | |
| 1749 | return iter; |
| 1750 | } |
| 1751 | |
| 1752 | /** |
| 1753 | * ftrace_rec_iter_record, get the record at the iterator location |
| 1754 | * @iter: The current iterator location |
| 1755 | * |
| 1756 | * Returns the record that the current @iter is at. |
| 1757 | */ |
| 1758 | struct dyn_ftrace *ftrace_rec_iter_record(struct ftrace_rec_iter *iter) |
| 1759 | { |
| 1760 | return &iter->pg->records[iter->index]; |
| 1761 | } |
| 1762 | |
Abhishek Sagar | 492a7ea5 | 2008-05-25 00:10:04 +0530 | [diff] [blame] | 1763 | static int |
Steven Rostedt | 31e8890 | 2008-11-14 16:21:19 -0800 | [diff] [blame] | 1764 | ftrace_code_disable(struct module *mod, struct dyn_ftrace *rec) |
Steven Rostedt | 3c1720f | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1765 | { |
| 1766 | unsigned long ip; |
Steven Rostedt | 593eb8a | 2008-10-23 09:32:59 -0400 | [diff] [blame] | 1767 | int ret; |
Steven Rostedt | 3c1720f | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1768 | |
| 1769 | ip = rec->ip; |
| 1770 | |
Steven Rostedt | 45a4a23 | 2011-04-21 23:16:46 -0400 | [diff] [blame] | 1771 | if (unlikely(ftrace_disabled)) |
| 1772 | return 0; |
| 1773 | |
Shaohua Li | 25aac9d | 2009-01-09 11:29:40 +0800 | [diff] [blame] | 1774 | ret = ftrace_make_nop(mod, rec, MCOUNT_ADDR); |
Steven Rostedt | 593eb8a | 2008-10-23 09:32:59 -0400 | [diff] [blame] | 1775 | if (ret) { |
Steven Rostedt | 31e8890 | 2008-11-14 16:21:19 -0800 | [diff] [blame] | 1776 | ftrace_bug(ret, ip); |
Abhishek Sagar | 492a7ea5 | 2008-05-25 00:10:04 +0530 | [diff] [blame] | 1777 | return 0; |
Steven Rostedt | 37ad508 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 1778 | } |
Abhishek Sagar | 492a7ea5 | 2008-05-25 00:10:04 +0530 | [diff] [blame] | 1779 | return 1; |
Steven Rostedt | 3c1720f | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1780 | } |
| 1781 | |
Steven Rostedt | 000ab69 | 2009-02-17 13:35:06 -0500 | [diff] [blame] | 1782 | /* |
| 1783 | * archs can override this function if they must do something |
| 1784 | * before the modifying code is performed. |
| 1785 | */ |
| 1786 | int __weak ftrace_arch_code_modify_prepare(void) |
| 1787 | { |
| 1788 | return 0; |
| 1789 | } |
| 1790 | |
| 1791 | /* |
| 1792 | * archs can override this function if they must do something |
| 1793 | * after the modifying code is performed. |
| 1794 | */ |
| 1795 | int __weak ftrace_arch_code_modify_post_process(void) |
| 1796 | { |
| 1797 | return 0; |
| 1798 | } |
| 1799 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1800 | static int __ftrace_modify_code(void *data) |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1801 | { |
Steven Rostedt | d61f82d | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1802 | int *command = data; |
| 1803 | |
Jiri Olsa | 30fb6aa | 2011-12-05 18:22:48 +0100 | [diff] [blame] | 1804 | if (*command & FTRACE_UPDATE_CALLS) |
Steven Rostedt | d61f82d | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1805 | ftrace_replace_code(1); |
Steven Rostedt | a358324 | 2008-11-11 15:01:42 -0500 | [diff] [blame] | 1806 | else if (*command & FTRACE_DISABLE_CALLS) |
Steven Rostedt | d61f82d | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1807 | ftrace_replace_code(0); |
| 1808 | |
| 1809 | if (*command & FTRACE_UPDATE_TRACE_FUNC) |
| 1810 | ftrace_update_ftrace_func(ftrace_trace_function); |
| 1811 | |
Steven Rostedt | 5a45cfe | 2008-11-26 00:16:24 -0500 | [diff] [blame] | 1812 | if (*command & FTRACE_START_FUNC_RET) |
| 1813 | ftrace_enable_ftrace_graph_caller(); |
| 1814 | else if (*command & FTRACE_STOP_FUNC_RET) |
| 1815 | ftrace_disable_ftrace_graph_caller(); |
| 1816 | |
Steven Rostedt | c88fd86 | 2011-08-16 09:53:39 -0400 | [diff] [blame] | 1817 | return 0; |
| 1818 | } |
| 1819 | |
| 1820 | /** |
| 1821 | * ftrace_run_stop_machine, go back to the stop machine method |
| 1822 | * @command: The command to tell ftrace what to do |
| 1823 | * |
| 1824 | * If an arch needs to fall back to the stop machine method, the |
| 1825 | * it can call this function. |
| 1826 | */ |
| 1827 | void ftrace_run_stop_machine(int command) |
| 1828 | { |
| 1829 | stop_machine(__ftrace_modify_code, &command, NULL); |
| 1830 | } |
| 1831 | |
| 1832 | /** |
| 1833 | * arch_ftrace_update_code, modify the code to trace or not trace |
| 1834 | * @command: The command that needs to be done |
| 1835 | * |
| 1836 | * Archs can override this function if it does not need to |
| 1837 | * run stop_machine() to modify code. |
| 1838 | */ |
| 1839 | void __weak arch_ftrace_update_code(int command) |
| 1840 | { |
| 1841 | ftrace_run_stop_machine(command); |
| 1842 | } |
| 1843 | |
| 1844 | static void ftrace_run_update_code(int command) |
| 1845 | { |
| 1846 | int ret; |
| 1847 | |
| 1848 | ret = ftrace_arch_code_modify_prepare(); |
| 1849 | FTRACE_WARN_ON(ret); |
| 1850 | if (ret) |
| 1851 | return; |
| 1852 | /* |
| 1853 | * Do not call function tracer while we update the code. |
| 1854 | * We are in stop machine. |
| 1855 | */ |
| 1856 | function_trace_stop++; |
| 1857 | |
| 1858 | /* |
| 1859 | * By default we use stop_machine() to modify the code. |
| 1860 | * But archs can do what ever they want as long as it |
| 1861 | * is safe. The stop_machine() is the safest, but also |
| 1862 | * produces the most overhead. |
| 1863 | */ |
| 1864 | arch_ftrace_update_code(command); |
| 1865 | |
Steven Rostedt | 6331c28 | 2011-07-13 15:11:02 -0400 | [diff] [blame] | 1866 | #ifndef CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST |
| 1867 | /* |
| 1868 | * For archs that call ftrace_test_stop_func(), we must |
| 1869 | * wait till after we update all the function callers |
| 1870 | * before we update the callback. This keeps different |
| 1871 | * ops that record different functions from corrupting |
| 1872 | * each other. |
| 1873 | */ |
| 1874 | __ftrace_trace_function = __ftrace_trace_function_delay; |
| 1875 | #endif |
| 1876 | function_trace_stop--; |
| 1877 | |
Steven Rostedt | 000ab69 | 2009-02-17 13:35:06 -0500 | [diff] [blame] | 1878 | ret = ftrace_arch_code_modify_post_process(); |
| 1879 | FTRACE_WARN_ON(ret); |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1880 | } |
| 1881 | |
Steven Rostedt | d61f82d | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1882 | static ftrace_func_t saved_ftrace_func; |
Steven Rostedt | 60a7ecf | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 1883 | static int ftrace_start_up; |
Steven Rostedt | b848914 | 2011-05-04 09:27:52 -0400 | [diff] [blame] | 1884 | static int global_start_up; |
Steven Rostedt | df4fc31 | 2008-11-26 00:16:23 -0500 | [diff] [blame] | 1885 | |
| 1886 | static void ftrace_startup_enable(int command) |
| 1887 | { |
| 1888 | if (saved_ftrace_func != ftrace_trace_function) { |
| 1889 | saved_ftrace_func = ftrace_trace_function; |
| 1890 | command |= FTRACE_UPDATE_TRACE_FUNC; |
| 1891 | } |
| 1892 | |
| 1893 | if (!command || !ftrace_enabled) |
| 1894 | return; |
| 1895 | |
| 1896 | ftrace_run_update_code(command); |
| 1897 | } |
Steven Rostedt | d61f82d | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1898 | |
Steven Rostedt | a1cd617 | 2011-05-23 15:24:25 -0400 | [diff] [blame] | 1899 | static int ftrace_startup(struct ftrace_ops *ops, int command) |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1900 | { |
Steven Rostedt | b848914 | 2011-05-04 09:27:52 -0400 | [diff] [blame] | 1901 | bool hash_enable = true; |
| 1902 | |
Steven Rostedt | 4eebcc8 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 1903 | if (unlikely(ftrace_disabled)) |
Steven Rostedt | a1cd617 | 2011-05-23 15:24:25 -0400 | [diff] [blame] | 1904 | return -ENODEV; |
Steven Rostedt | 4eebcc8 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 1905 | |
Steven Rostedt | 60a7ecf | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 1906 | ftrace_start_up++; |
Jiri Olsa | 30fb6aa | 2011-12-05 18:22:48 +0100 | [diff] [blame] | 1907 | command |= FTRACE_UPDATE_CALLS; |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1908 | |
Steven Rostedt | b848914 | 2011-05-04 09:27:52 -0400 | [diff] [blame] | 1909 | /* ops marked global share the filter hashes */ |
| 1910 | if (ops->flags & FTRACE_OPS_FL_GLOBAL) { |
| 1911 | ops = &global_ops; |
| 1912 | /* Don't update hash if global is already set */ |
| 1913 | if (global_start_up) |
| 1914 | hash_enable = false; |
| 1915 | global_start_up++; |
| 1916 | } |
| 1917 | |
Steven Rostedt | ed926f9 | 2011-05-03 13:25:24 -0400 | [diff] [blame] | 1918 | ops->flags |= FTRACE_OPS_FL_ENABLED; |
Steven Rostedt | b848914 | 2011-05-04 09:27:52 -0400 | [diff] [blame] | 1919 | if (hash_enable) |
Steven Rostedt | ed926f9 | 2011-05-03 13:25:24 -0400 | [diff] [blame] | 1920 | ftrace_hash_rec_enable(ops, 1); |
| 1921 | |
Steven Rostedt | df4fc31 | 2008-11-26 00:16:23 -0500 | [diff] [blame] | 1922 | ftrace_startup_enable(command); |
Steven Rostedt | a1cd617 | 2011-05-23 15:24:25 -0400 | [diff] [blame] | 1923 | |
| 1924 | return 0; |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1925 | } |
| 1926 | |
Steven Rostedt | bd69c30 | 2011-05-03 21:55:54 -0400 | [diff] [blame] | 1927 | static void ftrace_shutdown(struct ftrace_ops *ops, int command) |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1928 | { |
Steven Rostedt | b848914 | 2011-05-04 09:27:52 -0400 | [diff] [blame] | 1929 | bool hash_disable = true; |
| 1930 | |
Steven Rostedt | 4eebcc8 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 1931 | if (unlikely(ftrace_disabled)) |
| 1932 | return; |
| 1933 | |
Steven Rostedt | 60a7ecf | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 1934 | ftrace_start_up--; |
Frederic Weisbecker | 9ea1a15 | 2009-06-20 06:52:21 +0200 | [diff] [blame] | 1935 | /* |
| 1936 | * Just warn in case of unbalance, no need to kill ftrace, it's not |
| 1937 | * critical but the ftrace_call callers may be never nopped again after |
| 1938 | * further ftrace uses. |
| 1939 | */ |
| 1940 | WARN_ON_ONCE(ftrace_start_up < 0); |
| 1941 | |
Steven Rostedt | b848914 | 2011-05-04 09:27:52 -0400 | [diff] [blame] | 1942 | if (ops->flags & FTRACE_OPS_FL_GLOBAL) { |
| 1943 | ops = &global_ops; |
| 1944 | global_start_up--; |
| 1945 | WARN_ON_ONCE(global_start_up < 0); |
| 1946 | /* Don't update hash if global still has users */ |
| 1947 | if (global_start_up) { |
| 1948 | WARN_ON_ONCE(!ftrace_start_up); |
| 1949 | hash_disable = false; |
| 1950 | } |
| 1951 | } |
| 1952 | |
| 1953 | if (hash_disable) |
Steven Rostedt | ed926f9 | 2011-05-03 13:25:24 -0400 | [diff] [blame] | 1954 | ftrace_hash_rec_disable(ops, 1); |
| 1955 | |
Steven Rostedt | b848914 | 2011-05-04 09:27:52 -0400 | [diff] [blame] | 1956 | if (ops != &global_ops || !global_start_up) |
Steven Rostedt | ed926f9 | 2011-05-03 13:25:24 -0400 | [diff] [blame] | 1957 | ops->flags &= ~FTRACE_OPS_FL_ENABLED; |
Steven Rostedt | b848914 | 2011-05-04 09:27:52 -0400 | [diff] [blame] | 1958 | |
Jiri Olsa | 30fb6aa | 2011-12-05 18:22:48 +0100 | [diff] [blame] | 1959 | command |= FTRACE_UPDATE_CALLS; |
Steven Rostedt | d61f82d | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1960 | |
| 1961 | if (saved_ftrace_func != ftrace_trace_function) { |
| 1962 | saved_ftrace_func = ftrace_trace_function; |
| 1963 | command |= FTRACE_UPDATE_TRACE_FUNC; |
| 1964 | } |
| 1965 | |
| 1966 | if (!command || !ftrace_enabled) |
Steven Rostedt | e6ea44e | 2009-02-14 01:42:44 -0500 | [diff] [blame] | 1967 | return; |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1968 | |
Steven Rostedt | d61f82d | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1969 | ftrace_run_update_code(command); |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1970 | } |
| 1971 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1972 | static void ftrace_startup_sysctl(void) |
Steven Rostedt | b0fc494 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1973 | { |
Steven Rostedt | 4eebcc8 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 1974 | if (unlikely(ftrace_disabled)) |
| 1975 | return; |
| 1976 | |
Steven Rostedt | d61f82d | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1977 | /* Force update next time */ |
| 1978 | saved_ftrace_func = NULL; |
Steven Rostedt | 60a7ecf | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 1979 | /* ftrace_start_up is true if we want ftrace running */ |
| 1980 | if (ftrace_start_up) |
Jiri Olsa | 30fb6aa | 2011-12-05 18:22:48 +0100 | [diff] [blame] | 1981 | ftrace_run_update_code(FTRACE_UPDATE_CALLS); |
Steven Rostedt | b0fc494 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1982 | } |
| 1983 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1984 | static void ftrace_shutdown_sysctl(void) |
Steven Rostedt | b0fc494 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1985 | { |
Steven Rostedt | 4eebcc8 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 1986 | if (unlikely(ftrace_disabled)) |
| 1987 | return; |
| 1988 | |
Steven Rostedt | 60a7ecf | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 1989 | /* ftrace_start_up is true if ftrace is running */ |
| 1990 | if (ftrace_start_up) |
Steven Rostedt | 79e406d | 2010-09-14 22:19:46 -0400 | [diff] [blame] | 1991 | ftrace_run_update_code(FTRACE_DISABLE_CALLS); |
Steven Rostedt | b0fc494 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1992 | } |
| 1993 | |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1994 | static cycle_t ftrace_update_time; |
| 1995 | static unsigned long ftrace_update_cnt; |
| 1996 | unsigned long ftrace_update_tot_cnt; |
| 1997 | |
Steven Rostedt | f7bc8b6 | 2011-07-14 23:02:27 -0400 | [diff] [blame] | 1998 | static int ops_traces_mod(struct ftrace_ops *ops) |
| 1999 | { |
| 2000 | struct ftrace_hash *hash; |
| 2001 | |
| 2002 | hash = ops->filter_hash; |
Steven Rostedt | 06a51d9 | 2011-12-19 19:07:36 -0500 | [diff] [blame] | 2003 | return ftrace_hash_empty(hash); |
Steven Rostedt | f7bc8b6 | 2011-07-14 23:02:27 -0400 | [diff] [blame] | 2004 | } |
| 2005 | |
Steven Rostedt | 31e8890 | 2008-11-14 16:21:19 -0800 | [diff] [blame] | 2006 | static int ftrace_update_code(struct module *mod) |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2007 | { |
Steven Rostedt | 85ae32a | 2011-12-16 16:30:31 -0500 | [diff] [blame] | 2008 | struct ftrace_page *pg; |
Lai Jiangshan | e94142a | 2009-03-13 17:51:27 +0800 | [diff] [blame] | 2009 | struct dyn_ftrace *p; |
Abhishek Sagar | f22f9a8 | 2008-06-21 23:50:29 +0530 | [diff] [blame] | 2010 | cycle_t start, stop; |
Steven Rostedt | f7bc8b6 | 2011-07-14 23:02:27 -0400 | [diff] [blame] | 2011 | unsigned long ref = 0; |
Steven Rostedt | 85ae32a | 2011-12-16 16:30:31 -0500 | [diff] [blame] | 2012 | int i; |
Steven Rostedt | f7bc8b6 | 2011-07-14 23:02:27 -0400 | [diff] [blame] | 2013 | |
| 2014 | /* |
| 2015 | * When adding a module, we need to check if tracers are |
| 2016 | * currently enabled and if they are set to trace all functions. |
| 2017 | * If they are, we need to enable the module functions as well |
| 2018 | * as update the reference counts for those function records. |
| 2019 | */ |
| 2020 | if (mod) { |
| 2021 | struct ftrace_ops *ops; |
| 2022 | |
| 2023 | for (ops = ftrace_ops_list; |
| 2024 | ops != &ftrace_list_end; ops = ops->next) { |
| 2025 | if (ops->flags & FTRACE_OPS_FL_ENABLED && |
| 2026 | ops_traces_mod(ops)) |
| 2027 | ref++; |
| 2028 | } |
| 2029 | } |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2030 | |
Ingo Molnar | 750ed1a | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2031 | start = ftrace_now(raw_smp_processor_id()); |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2032 | ftrace_update_cnt = 0; |
| 2033 | |
Steven Rostedt | 85ae32a | 2011-12-16 16:30:31 -0500 | [diff] [blame] | 2034 | for (pg = ftrace_new_pgs; pg; pg = pg->next) { |
Abhishek Sagar | f22f9a8 | 2008-06-21 23:50:29 +0530 | [diff] [blame] | 2035 | |
Steven Rostedt | 85ae32a | 2011-12-16 16:30:31 -0500 | [diff] [blame] | 2036 | for (i = 0; i < pg->index; i++) { |
| 2037 | /* If something went wrong, bail without enabling anything */ |
| 2038 | if (unlikely(ftrace_disabled)) |
| 2039 | return -1; |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2040 | |
Steven Rostedt | 85ae32a | 2011-12-16 16:30:31 -0500 | [diff] [blame] | 2041 | p = &pg->records[i]; |
| 2042 | p->flags = ref; |
Abhishek Sagar | 0eb9670 | 2008-06-01 21:47:30 +0530 | [diff] [blame] | 2043 | |
Steven Rostedt | 85ae32a | 2011-12-16 16:30:31 -0500 | [diff] [blame] | 2044 | /* |
| 2045 | * Do the initial record conversion from mcount jump |
| 2046 | * to the NOP instructions. |
| 2047 | */ |
| 2048 | if (!ftrace_code_disable(mod, p)) |
| 2049 | break; |
Jiri Olsa | 5cb084b | 2009-10-13 16:33:53 -0400 | [diff] [blame] | 2050 | |
Steven Rostedt | 85ae32a | 2011-12-16 16:30:31 -0500 | [diff] [blame] | 2051 | ftrace_update_cnt++; |
Jiri Olsa | 5cb084b | 2009-10-13 16:33:53 -0400 | [diff] [blame] | 2052 | |
Steven Rostedt | 85ae32a | 2011-12-16 16:30:31 -0500 | [diff] [blame] | 2053 | /* |
| 2054 | * If the tracing is enabled, go ahead and enable the record. |
| 2055 | * |
| 2056 | * The reason not to enable the record immediatelly is the |
| 2057 | * inherent check of ftrace_make_nop/ftrace_make_call for |
| 2058 | * correct previous instructions. Making first the NOP |
| 2059 | * conversion puts the module to the correct state, thus |
| 2060 | * passing the ftrace_make_call check. |
| 2061 | */ |
| 2062 | if (ftrace_start_up && ref) { |
| 2063 | int failed = __ftrace_replace_code(p, 1); |
| 2064 | if (failed) |
| 2065 | ftrace_bug(failed, p->ip); |
| 2066 | } |
Jiri Olsa | 5cb084b | 2009-10-13 16:33:53 -0400 | [diff] [blame] | 2067 | } |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2068 | } |
| 2069 | |
Steven Rostedt | 85ae32a | 2011-12-16 16:30:31 -0500 | [diff] [blame] | 2070 | ftrace_new_pgs = NULL; |
| 2071 | |
Ingo Molnar | 750ed1a | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2072 | stop = ftrace_now(raw_smp_processor_id()); |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2073 | ftrace_update_time = stop - start; |
| 2074 | ftrace_update_tot_cnt += ftrace_update_cnt; |
| 2075 | |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2076 | return 0; |
| 2077 | } |
| 2078 | |
Steven Rostedt | a790087 | 2011-12-16 16:23:44 -0500 | [diff] [blame] | 2079 | static int ftrace_allocate_records(struct ftrace_page *pg, int count) |
Steven Rostedt | 3c1720f | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2080 | { |
Steven Rostedt | a790087 | 2011-12-16 16:23:44 -0500 | [diff] [blame] | 2081 | int order; |
Steven Rostedt | 3c1720f | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2082 | int cnt; |
Steven Rostedt | 3c1720f | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2083 | |
Steven Rostedt | a790087 | 2011-12-16 16:23:44 -0500 | [diff] [blame] | 2084 | if (WARN_ON(!count)) |
| 2085 | return -EINVAL; |
| 2086 | |
| 2087 | order = get_count_order(DIV_ROUND_UP(count, ENTRIES_PER_PAGE)); |
Steven Rostedt | 3c1720f | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2088 | |
| 2089 | /* |
Steven Rostedt | a790087 | 2011-12-16 16:23:44 -0500 | [diff] [blame] | 2090 | * We want to fill as much as possible. No more than a page |
| 2091 | * may be empty. |
Steven Rostedt | 3c1720f | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2092 | */ |
Steven Rostedt | a790087 | 2011-12-16 16:23:44 -0500 | [diff] [blame] | 2093 | while ((PAGE_SIZE << order) / ENTRY_SIZE >= count + ENTRIES_PER_PAGE) |
| 2094 | order--; |
Steven Rostedt | 3c1720f | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2095 | |
Steven Rostedt | a790087 | 2011-12-16 16:23:44 -0500 | [diff] [blame] | 2096 | again: |
| 2097 | pg->records = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, order); |
| 2098 | |
| 2099 | if (!pg->records) { |
| 2100 | /* if we can't allocate this size, try something smaller */ |
| 2101 | if (!order) |
| 2102 | return -ENOMEM; |
| 2103 | order >>= 1; |
| 2104 | goto again; |
| 2105 | } |
| 2106 | |
| 2107 | cnt = (PAGE_SIZE << order) / ENTRY_SIZE; |
| 2108 | pg->size = cnt; |
| 2109 | |
| 2110 | if (cnt > count) |
| 2111 | cnt = count; |
| 2112 | |
| 2113 | return cnt; |
| 2114 | } |
| 2115 | |
| 2116 | static struct ftrace_page * |
| 2117 | ftrace_allocate_pages(unsigned long num_to_init) |
| 2118 | { |
| 2119 | struct ftrace_page *start_pg; |
| 2120 | struct ftrace_page *pg; |
| 2121 | int order; |
| 2122 | int cnt; |
| 2123 | |
| 2124 | if (!num_to_init) |
| 2125 | return 0; |
| 2126 | |
| 2127 | start_pg = pg = kzalloc(sizeof(*pg), GFP_KERNEL); |
| 2128 | if (!pg) |
| 2129 | return NULL; |
| 2130 | |
| 2131 | /* |
| 2132 | * Try to allocate as much as possible in one continues |
| 2133 | * location that fills in all of the space. We want to |
| 2134 | * waste as little space as possible. |
| 2135 | */ |
| 2136 | for (;;) { |
| 2137 | cnt = ftrace_allocate_records(pg, num_to_init); |
| 2138 | if (cnt < 0) |
| 2139 | goto free_pages; |
| 2140 | |
| 2141 | num_to_init -= cnt; |
| 2142 | if (!num_to_init) |
| 2143 | break; |
| 2144 | |
| 2145 | pg->next = kzalloc(sizeof(*pg), GFP_KERNEL); |
| 2146 | if (!pg->next) |
| 2147 | goto free_pages; |
| 2148 | |
| 2149 | pg = pg->next; |
| 2150 | } |
| 2151 | |
| 2152 | return start_pg; |
| 2153 | |
| 2154 | free_pages: |
| 2155 | while (start_pg) { |
| 2156 | order = get_count_order(pg->size / ENTRIES_PER_PAGE); |
| 2157 | free_pages((unsigned long)pg->records, order); |
| 2158 | start_pg = pg->next; |
| 2159 | kfree(pg); |
| 2160 | pg = start_pg; |
| 2161 | } |
| 2162 | pr_info("ftrace: FAILED to allocate memory for functions\n"); |
| 2163 | return NULL; |
| 2164 | } |
| 2165 | |
| 2166 | static int __init ftrace_dyn_table_alloc(unsigned long num_to_init) |
| 2167 | { |
| 2168 | int cnt; |
| 2169 | |
| 2170 | if (!num_to_init) { |
| 2171 | pr_info("ftrace: No functions to be traced?\n"); |
| 2172 | return -1; |
| 2173 | } |
Steven Rostedt | 3c1720f | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2174 | |
Steven Rostedt | 68bf21a | 2008-08-14 15:45:08 -0400 | [diff] [blame] | 2175 | cnt = num_to_init / ENTRIES_PER_PAGE; |
Steven Rostedt | 08f5ac90 | 2008-10-23 09:33:07 -0400 | [diff] [blame] | 2176 | pr_info("ftrace: allocating %ld entries in %d pages\n", |
walimis | 5821e1b | 2008-11-15 15:19:06 +0800 | [diff] [blame] | 2177 | num_to_init, cnt + 1); |
Steven Rostedt | 3c1720f | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2178 | |
Steven Rostedt | 3c1720f | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2179 | return 0; |
| 2180 | } |
| 2181 | |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2182 | #define FTRACE_BUFF_MAX (KSYM_SYMBOL_LEN+4) /* room for wildcards */ |
| 2183 | |
| 2184 | struct ftrace_iterator { |
Steven Rostedt | 98c4fd0 | 2010-09-10 11:47:43 -0400 | [diff] [blame] | 2185 | loff_t pos; |
Steven Rostedt | 4aeb696 | 2010-09-09 10:00:28 -0400 | [diff] [blame] | 2186 | loff_t func_pos; |
| 2187 | struct ftrace_page *pg; |
| 2188 | struct dyn_ftrace *func; |
| 2189 | struct ftrace_func_probe *probe; |
| 2190 | struct trace_parser parser; |
Steven Rostedt | 1cf41dd7 | 2011-04-29 20:59:51 -0400 | [diff] [blame] | 2191 | struct ftrace_hash *hash; |
Steven Rostedt | 33dc9b1 | 2011-05-02 17:34:47 -0400 | [diff] [blame] | 2192 | struct ftrace_ops *ops; |
Steven Rostedt | 4aeb696 | 2010-09-09 10:00:28 -0400 | [diff] [blame] | 2193 | int hidx; |
| 2194 | int idx; |
| 2195 | unsigned flags; |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2196 | }; |
| 2197 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 2198 | static void * |
Steven Rostedt | 4aeb696 | 2010-09-09 10:00:28 -0400 | [diff] [blame] | 2199 | t_hash_next(struct seq_file *m, loff_t *pos) |
Steven Rostedt | 8fc0c70 | 2009-02-16 15:28:00 -0500 | [diff] [blame] | 2200 | { |
| 2201 | struct ftrace_iterator *iter = m->private; |
Steven Rostedt | 4aeb696 | 2010-09-09 10:00:28 -0400 | [diff] [blame] | 2202 | struct hlist_node *hnd = NULL; |
Steven Rostedt | 8fc0c70 | 2009-02-16 15:28:00 -0500 | [diff] [blame] | 2203 | struct hlist_head *hhd; |
| 2204 | |
Steven Rostedt | 8fc0c70 | 2009-02-16 15:28:00 -0500 | [diff] [blame] | 2205 | (*pos)++; |
Steven Rostedt | 98c4fd0 | 2010-09-10 11:47:43 -0400 | [diff] [blame] | 2206 | iter->pos = *pos; |
Steven Rostedt | 8fc0c70 | 2009-02-16 15:28:00 -0500 | [diff] [blame] | 2207 | |
Steven Rostedt | 4aeb696 | 2010-09-09 10:00:28 -0400 | [diff] [blame] | 2208 | if (iter->probe) |
| 2209 | hnd = &iter->probe->node; |
Steven Rostedt | 8fc0c70 | 2009-02-16 15:28:00 -0500 | [diff] [blame] | 2210 | retry: |
| 2211 | if (iter->hidx >= FTRACE_FUNC_HASHSIZE) |
| 2212 | return NULL; |
| 2213 | |
| 2214 | hhd = &ftrace_func_hash[iter->hidx]; |
| 2215 | |
| 2216 | if (hlist_empty(hhd)) { |
| 2217 | iter->hidx++; |
| 2218 | hnd = NULL; |
| 2219 | goto retry; |
| 2220 | } |
| 2221 | |
| 2222 | if (!hnd) |
| 2223 | hnd = hhd->first; |
| 2224 | else { |
| 2225 | hnd = hnd->next; |
| 2226 | if (!hnd) { |
| 2227 | iter->hidx++; |
| 2228 | goto retry; |
| 2229 | } |
| 2230 | } |
| 2231 | |
Steven Rostedt | 4aeb696 | 2010-09-09 10:00:28 -0400 | [diff] [blame] | 2232 | if (WARN_ON_ONCE(!hnd)) |
| 2233 | return NULL; |
| 2234 | |
| 2235 | iter->probe = hlist_entry(hnd, struct ftrace_func_probe, node); |
| 2236 | |
| 2237 | return iter; |
Steven Rostedt | 8fc0c70 | 2009-02-16 15:28:00 -0500 | [diff] [blame] | 2238 | } |
| 2239 | |
| 2240 | static void *t_hash_start(struct seq_file *m, loff_t *pos) |
| 2241 | { |
| 2242 | struct ftrace_iterator *iter = m->private; |
| 2243 | void *p = NULL; |
Li Zefan | d82d624 | 2009-06-24 09:54:54 +0800 | [diff] [blame] | 2244 | loff_t l; |
| 2245 | |
Steven Rostedt | 69a3083 | 2011-12-19 15:21:16 -0500 | [diff] [blame] | 2246 | if (!(iter->flags & FTRACE_ITER_DO_HASH)) |
| 2247 | return NULL; |
| 2248 | |
Steven Rostedt | 2bccfff | 2010-09-09 08:43:22 -0400 | [diff] [blame] | 2249 | if (iter->func_pos > *pos) |
| 2250 | return NULL; |
Steven Rostedt | 8fc0c70 | 2009-02-16 15:28:00 -0500 | [diff] [blame] | 2251 | |
Li Zefan | d82d624 | 2009-06-24 09:54:54 +0800 | [diff] [blame] | 2252 | iter->hidx = 0; |
Steven Rostedt | 2bccfff | 2010-09-09 08:43:22 -0400 | [diff] [blame] | 2253 | for (l = 0; l <= (*pos - iter->func_pos); ) { |
Steven Rostedt | 4aeb696 | 2010-09-09 10:00:28 -0400 | [diff] [blame] | 2254 | p = t_hash_next(m, &l); |
Li Zefan | d82d624 | 2009-06-24 09:54:54 +0800 | [diff] [blame] | 2255 | if (!p) |
| 2256 | break; |
| 2257 | } |
Steven Rostedt | 4aeb696 | 2010-09-09 10:00:28 -0400 | [diff] [blame] | 2258 | if (!p) |
| 2259 | return NULL; |
| 2260 | |
Steven Rostedt | 98c4fd0 | 2010-09-10 11:47:43 -0400 | [diff] [blame] | 2261 | /* Only set this if we have an item */ |
| 2262 | iter->flags |= FTRACE_ITER_HASH; |
| 2263 | |
Steven Rostedt | 4aeb696 | 2010-09-09 10:00:28 -0400 | [diff] [blame] | 2264 | return iter; |
Steven Rostedt | 8fc0c70 | 2009-02-16 15:28:00 -0500 | [diff] [blame] | 2265 | } |
| 2266 | |
Steven Rostedt | 4aeb696 | 2010-09-09 10:00:28 -0400 | [diff] [blame] | 2267 | static int |
| 2268 | t_hash_show(struct seq_file *m, struct ftrace_iterator *iter) |
Steven Rostedt | 8fc0c70 | 2009-02-16 15:28:00 -0500 | [diff] [blame] | 2269 | { |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 2270 | struct ftrace_func_probe *rec; |
Steven Rostedt | 8fc0c70 | 2009-02-16 15:28:00 -0500 | [diff] [blame] | 2271 | |
Steven Rostedt | 4aeb696 | 2010-09-09 10:00:28 -0400 | [diff] [blame] | 2272 | rec = iter->probe; |
| 2273 | if (WARN_ON_ONCE(!rec)) |
| 2274 | return -EIO; |
Steven Rostedt | 8fc0c70 | 2009-02-16 15:28:00 -0500 | [diff] [blame] | 2275 | |
Steven Rostedt | 809dcf2 | 2009-02-16 23:06:01 -0500 | [diff] [blame] | 2276 | if (rec->ops->print) |
| 2277 | return rec->ops->print(m, rec->ip, rec->ops, rec->data); |
| 2278 | |
Steven Rostedt | b375a11 | 2009-09-17 00:05:58 -0400 | [diff] [blame] | 2279 | seq_printf(m, "%ps:%ps", (void *)rec->ip, (void *)rec->ops->func); |
Steven Rostedt | 8fc0c70 | 2009-02-16 15:28:00 -0500 | [diff] [blame] | 2280 | |
| 2281 | if (rec->data) |
| 2282 | seq_printf(m, ":%p", rec->data); |
| 2283 | seq_putc(m, '\n'); |
| 2284 | |
| 2285 | return 0; |
| 2286 | } |
| 2287 | |
| 2288 | static void * |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2289 | t_next(struct seq_file *m, void *v, loff_t *pos) |
| 2290 | { |
| 2291 | struct ftrace_iterator *iter = m->private; |
Steven Rostedt | fc13cb0 | 2011-12-19 14:41:25 -0500 | [diff] [blame] | 2292 | struct ftrace_ops *ops = iter->ops; |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2293 | struct dyn_ftrace *rec = NULL; |
| 2294 | |
Steven Rostedt | 45a4a23 | 2011-04-21 23:16:46 -0400 | [diff] [blame] | 2295 | if (unlikely(ftrace_disabled)) |
| 2296 | return NULL; |
| 2297 | |
Steven Rostedt | 8fc0c70 | 2009-02-16 15:28:00 -0500 | [diff] [blame] | 2298 | if (iter->flags & FTRACE_ITER_HASH) |
Steven Rostedt | 4aeb696 | 2010-09-09 10:00:28 -0400 | [diff] [blame] | 2299 | return t_hash_next(m, pos); |
Steven Rostedt | 8fc0c70 | 2009-02-16 15:28:00 -0500 | [diff] [blame] | 2300 | |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2301 | (*pos)++; |
Jiri Olsa | 1106b69 | 2011-02-16 17:35:34 +0100 | [diff] [blame] | 2302 | iter->pos = iter->func_pos = *pos; |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2303 | |
Steven Rostedt | 0c75a3e | 2009-02-16 11:21:52 -0500 | [diff] [blame] | 2304 | if (iter->flags & FTRACE_ITER_PRINTALL) |
Steven Rostedt | 57c072c | 2010-09-14 11:21:11 -0400 | [diff] [blame] | 2305 | return t_hash_start(m, pos); |
Steven Rostedt | 0c75a3e | 2009-02-16 11:21:52 -0500 | [diff] [blame] | 2306 | |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2307 | retry: |
| 2308 | if (iter->idx >= iter->pg->index) { |
| 2309 | if (iter->pg->next) { |
| 2310 | iter->pg = iter->pg->next; |
| 2311 | iter->idx = 0; |
| 2312 | goto retry; |
| 2313 | } |
| 2314 | } else { |
| 2315 | rec = &iter->pg->records[iter->idx++]; |
Steven Rostedt | 3208230 | 2011-12-16 14:42:37 -0500 | [diff] [blame] | 2316 | if (((iter->flags & FTRACE_ITER_FILTER) && |
Steven Rostedt | f45948e | 2011-05-02 12:29:25 -0400 | [diff] [blame] | 2317 | !(ftrace_lookup_ip(ops->filter_hash, rec->ip))) || |
Steven Rostedt | 0183fb1 | 2008-11-07 22:36:02 -0500 | [diff] [blame] | 2318 | |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 2319 | ((iter->flags & FTRACE_ITER_NOTRACE) && |
Steven Rostedt | 647bcd0 | 2011-05-03 14:39:21 -0400 | [diff] [blame] | 2320 | !ftrace_lookup_ip(ops->notrace_hash, rec->ip)) || |
| 2321 | |
| 2322 | ((iter->flags & FTRACE_ITER_ENABLED) && |
| 2323 | !(rec->flags & ~FTRACE_FL_MASK))) { |
| 2324 | |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2325 | rec = NULL; |
| 2326 | goto retry; |
| 2327 | } |
| 2328 | } |
| 2329 | |
Steven Rostedt | 4aeb696 | 2010-09-09 10:00:28 -0400 | [diff] [blame] | 2330 | if (!rec) |
Steven Rostedt | 57c072c | 2010-09-14 11:21:11 -0400 | [diff] [blame] | 2331 | return t_hash_start(m, pos); |
Steven Rostedt | 4aeb696 | 2010-09-09 10:00:28 -0400 | [diff] [blame] | 2332 | |
| 2333 | iter->func = rec; |
| 2334 | |
| 2335 | return iter; |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2336 | } |
| 2337 | |
Steven Rostedt | 98c4fd0 | 2010-09-10 11:47:43 -0400 | [diff] [blame] | 2338 | static void reset_iter_read(struct ftrace_iterator *iter) |
| 2339 | { |
| 2340 | iter->pos = 0; |
| 2341 | iter->func_pos = 0; |
| 2342 | iter->flags &= ~(FTRACE_ITER_PRINTALL & FTRACE_ITER_HASH); |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2343 | } |
| 2344 | |
| 2345 | static void *t_start(struct seq_file *m, loff_t *pos) |
| 2346 | { |
| 2347 | struct ftrace_iterator *iter = m->private; |
Steven Rostedt | fc13cb0 | 2011-12-19 14:41:25 -0500 | [diff] [blame] | 2348 | struct ftrace_ops *ops = iter->ops; |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2349 | void *p = NULL; |
Li Zefan | 694ce0a | 2009-06-24 09:54:19 +0800 | [diff] [blame] | 2350 | loff_t l; |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2351 | |
Steven Rostedt | 8fc0c70 | 2009-02-16 15:28:00 -0500 | [diff] [blame] | 2352 | mutex_lock(&ftrace_lock); |
Steven Rostedt | 45a4a23 | 2011-04-21 23:16:46 -0400 | [diff] [blame] | 2353 | |
| 2354 | if (unlikely(ftrace_disabled)) |
| 2355 | return NULL; |
| 2356 | |
Steven Rostedt | 0c75a3e | 2009-02-16 11:21:52 -0500 | [diff] [blame] | 2357 | /* |
Steven Rostedt | 98c4fd0 | 2010-09-10 11:47:43 -0400 | [diff] [blame] | 2358 | * If an lseek was done, then reset and start from beginning. |
| 2359 | */ |
| 2360 | if (*pos < iter->pos) |
| 2361 | reset_iter_read(iter); |
| 2362 | |
| 2363 | /* |
Steven Rostedt | 0c75a3e | 2009-02-16 11:21:52 -0500 | [diff] [blame] | 2364 | * For set_ftrace_filter reading, if we have the filter |
| 2365 | * off, we can short cut and just print out that all |
| 2366 | * functions are enabled. |
| 2367 | */ |
Steven Rostedt | 06a51d9 | 2011-12-19 19:07:36 -0500 | [diff] [blame] | 2368 | if (iter->flags & FTRACE_ITER_FILTER && |
| 2369 | ftrace_hash_empty(ops->filter_hash)) { |
Steven Rostedt | 0c75a3e | 2009-02-16 11:21:52 -0500 | [diff] [blame] | 2370 | if (*pos > 0) |
Steven Rostedt | 8fc0c70 | 2009-02-16 15:28:00 -0500 | [diff] [blame] | 2371 | return t_hash_start(m, pos); |
Steven Rostedt | 0c75a3e | 2009-02-16 11:21:52 -0500 | [diff] [blame] | 2372 | iter->flags |= FTRACE_ITER_PRINTALL; |
Chris Wright | df09162 | 2010-09-09 16:34:59 -0700 | [diff] [blame] | 2373 | /* reset in case of seek/pread */ |
| 2374 | iter->flags &= ~FTRACE_ITER_HASH; |
Steven Rostedt | 0c75a3e | 2009-02-16 11:21:52 -0500 | [diff] [blame] | 2375 | return iter; |
| 2376 | } |
| 2377 | |
Steven Rostedt | 8fc0c70 | 2009-02-16 15:28:00 -0500 | [diff] [blame] | 2378 | if (iter->flags & FTRACE_ITER_HASH) |
| 2379 | return t_hash_start(m, pos); |
| 2380 | |
Steven Rostedt | 98c4fd0 | 2010-09-10 11:47:43 -0400 | [diff] [blame] | 2381 | /* |
| 2382 | * Unfortunately, we need to restart at ftrace_pages_start |
| 2383 | * every time we let go of the ftrace_mutex. This is because |
| 2384 | * those pointers can change without the lock. |
| 2385 | */ |
Li Zefan | 694ce0a | 2009-06-24 09:54:19 +0800 | [diff] [blame] | 2386 | iter->pg = ftrace_pages_start; |
| 2387 | iter->idx = 0; |
| 2388 | for (l = 0; l <= *pos; ) { |
| 2389 | p = t_next(m, p, &l); |
| 2390 | if (!p) |
| 2391 | break; |
Liming Wang | 50cdaf0 | 2008-11-28 12:13:21 +0800 | [diff] [blame] | 2392 | } |
walimis | 5821e1b | 2008-11-15 15:19:06 +0800 | [diff] [blame] | 2393 | |
Steven Rostedt | 69a3083 | 2011-12-19 15:21:16 -0500 | [diff] [blame] | 2394 | if (!p) |
| 2395 | return t_hash_start(m, pos); |
Steven Rostedt | 4aeb696 | 2010-09-09 10:00:28 -0400 | [diff] [blame] | 2396 | |
| 2397 | return iter; |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2398 | } |
| 2399 | |
| 2400 | static void t_stop(struct seq_file *m, void *p) |
| 2401 | { |
Steven Rostedt | 8fc0c70 | 2009-02-16 15:28:00 -0500 | [diff] [blame] | 2402 | mutex_unlock(&ftrace_lock); |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2403 | } |
| 2404 | |
| 2405 | static int t_show(struct seq_file *m, void *v) |
| 2406 | { |
Steven Rostedt | 0c75a3e | 2009-02-16 11:21:52 -0500 | [diff] [blame] | 2407 | struct ftrace_iterator *iter = m->private; |
Steven Rostedt | 4aeb696 | 2010-09-09 10:00:28 -0400 | [diff] [blame] | 2408 | struct dyn_ftrace *rec; |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2409 | |
Steven Rostedt | 8fc0c70 | 2009-02-16 15:28:00 -0500 | [diff] [blame] | 2410 | if (iter->flags & FTRACE_ITER_HASH) |
Steven Rostedt | 4aeb696 | 2010-09-09 10:00:28 -0400 | [diff] [blame] | 2411 | return t_hash_show(m, iter); |
Steven Rostedt | 8fc0c70 | 2009-02-16 15:28:00 -0500 | [diff] [blame] | 2412 | |
Steven Rostedt | 0c75a3e | 2009-02-16 11:21:52 -0500 | [diff] [blame] | 2413 | if (iter->flags & FTRACE_ITER_PRINTALL) { |
| 2414 | seq_printf(m, "#### all functions enabled ####\n"); |
| 2415 | return 0; |
| 2416 | } |
| 2417 | |
Steven Rostedt | 4aeb696 | 2010-09-09 10:00:28 -0400 | [diff] [blame] | 2418 | rec = iter->func; |
| 2419 | |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2420 | if (!rec) |
| 2421 | return 0; |
| 2422 | |
Steven Rostedt | 647bcd0 | 2011-05-03 14:39:21 -0400 | [diff] [blame] | 2423 | seq_printf(m, "%ps", (void *)rec->ip); |
| 2424 | if (iter->flags & FTRACE_ITER_ENABLED) |
| 2425 | seq_printf(m, " (%ld)", |
| 2426 | rec->flags & ~FTRACE_FL_MASK); |
| 2427 | seq_printf(m, "\n"); |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2428 | |
| 2429 | return 0; |
| 2430 | } |
| 2431 | |
James Morris | 88e9d34 | 2009-09-22 16:43:43 -0700 | [diff] [blame] | 2432 | static const struct seq_operations show_ftrace_seq_ops = { |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2433 | .start = t_start, |
| 2434 | .next = t_next, |
| 2435 | .stop = t_stop, |
| 2436 | .show = t_show, |
| 2437 | }; |
| 2438 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 2439 | static int |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2440 | ftrace_avail_open(struct inode *inode, struct file *file) |
| 2441 | { |
| 2442 | struct ftrace_iterator *iter; |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2443 | |
Steven Rostedt | 4eebcc8 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 2444 | if (unlikely(ftrace_disabled)) |
| 2445 | return -ENODEV; |
| 2446 | |
Jiri Olsa | 50e18b9 | 2012-04-25 10:23:39 +0200 | [diff] [blame] | 2447 | iter = __seq_open_private(file, &show_ftrace_seq_ops, sizeof(*iter)); |
| 2448 | if (iter) { |
| 2449 | iter->pg = ftrace_pages_start; |
| 2450 | iter->ops = &global_ops; |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2451 | } |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2452 | |
Jiri Olsa | 50e18b9 | 2012-04-25 10:23:39 +0200 | [diff] [blame] | 2453 | return iter ? 0 : -ENOMEM; |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2454 | } |
| 2455 | |
Steven Rostedt | 647bcd0 | 2011-05-03 14:39:21 -0400 | [diff] [blame] | 2456 | static int |
| 2457 | ftrace_enabled_open(struct inode *inode, struct file *file) |
| 2458 | { |
| 2459 | struct ftrace_iterator *iter; |
Steven Rostedt | 647bcd0 | 2011-05-03 14:39:21 -0400 | [diff] [blame] | 2460 | |
| 2461 | if (unlikely(ftrace_disabled)) |
| 2462 | return -ENODEV; |
| 2463 | |
Jiri Olsa | 50e18b9 | 2012-04-25 10:23:39 +0200 | [diff] [blame] | 2464 | iter = __seq_open_private(file, &show_ftrace_seq_ops, sizeof(*iter)); |
| 2465 | if (iter) { |
| 2466 | iter->pg = ftrace_pages_start; |
| 2467 | iter->flags = FTRACE_ITER_ENABLED; |
| 2468 | iter->ops = &global_ops; |
Steven Rostedt | 647bcd0 | 2011-05-03 14:39:21 -0400 | [diff] [blame] | 2469 | } |
| 2470 | |
Jiri Olsa | 50e18b9 | 2012-04-25 10:23:39 +0200 | [diff] [blame] | 2471 | return iter ? 0 : -ENOMEM; |
Steven Rostedt | 647bcd0 | 2011-05-03 14:39:21 -0400 | [diff] [blame] | 2472 | } |
| 2473 | |
Steven Rostedt | 1cf41dd7 | 2011-04-29 20:59:51 -0400 | [diff] [blame] | 2474 | static void ftrace_filter_reset(struct ftrace_hash *hash) |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2475 | { |
Steven Rostedt | 52baf11 | 2009-02-14 01:15:39 -0500 | [diff] [blame] | 2476 | mutex_lock(&ftrace_lock); |
Steven Rostedt | 1cf41dd7 | 2011-04-29 20:59:51 -0400 | [diff] [blame] | 2477 | ftrace_hash_clear(hash); |
Steven Rostedt | 52baf11 | 2009-02-14 01:15:39 -0500 | [diff] [blame] | 2478 | mutex_unlock(&ftrace_lock); |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2479 | } |
| 2480 | |
Steven Rostedt | fc13cb0 | 2011-12-19 14:41:25 -0500 | [diff] [blame] | 2481 | /** |
| 2482 | * ftrace_regex_open - initialize function tracer filter files |
| 2483 | * @ops: The ftrace_ops that hold the hash filters |
| 2484 | * @flag: The type of filter to process |
| 2485 | * @inode: The inode, usually passed in to your open routine |
| 2486 | * @file: The file, usually passed in to your open routine |
| 2487 | * |
| 2488 | * ftrace_regex_open() initializes the filter files for the |
| 2489 | * @ops. Depending on @flag it may process the filter hash or |
| 2490 | * the notrace hash of @ops. With this called from the open |
| 2491 | * routine, you can use ftrace_filter_write() for the write |
| 2492 | * routine if @flag has FTRACE_ITER_FILTER set, or |
| 2493 | * ftrace_notrace_write() if @flag has FTRACE_ITER_NOTRACE set. |
| 2494 | * ftrace_regex_lseek() should be used as the lseek routine, and |
| 2495 | * release must call ftrace_regex_release(). |
| 2496 | */ |
| 2497 | int |
Steven Rostedt | f45948e | 2011-05-02 12:29:25 -0400 | [diff] [blame] | 2498 | ftrace_regex_open(struct ftrace_ops *ops, int flag, |
Steven Rostedt | 1cf41dd7 | 2011-04-29 20:59:51 -0400 | [diff] [blame] | 2499 | struct inode *inode, struct file *file) |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2500 | { |
| 2501 | struct ftrace_iterator *iter; |
Steven Rostedt | f45948e | 2011-05-02 12:29:25 -0400 | [diff] [blame] | 2502 | struct ftrace_hash *hash; |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2503 | int ret = 0; |
| 2504 | |
Steven Rostedt | 4eebcc8 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 2505 | if (unlikely(ftrace_disabled)) |
| 2506 | return -ENODEV; |
| 2507 | |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2508 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); |
| 2509 | if (!iter) |
| 2510 | return -ENOMEM; |
| 2511 | |
jolsa@redhat.com | 689fd8b | 2009-09-11 17:29:29 +0200 | [diff] [blame] | 2512 | if (trace_parser_get_init(&iter->parser, FTRACE_BUFF_MAX)) { |
| 2513 | kfree(iter); |
| 2514 | return -ENOMEM; |
| 2515 | } |
| 2516 | |
Steven Rostedt | f45948e | 2011-05-02 12:29:25 -0400 | [diff] [blame] | 2517 | if (flag & FTRACE_ITER_NOTRACE) |
| 2518 | hash = ops->notrace_hash; |
| 2519 | else |
| 2520 | hash = ops->filter_hash; |
| 2521 | |
Steven Rostedt | 33dc9b1 | 2011-05-02 17:34:47 -0400 | [diff] [blame] | 2522 | iter->ops = ops; |
| 2523 | iter->flags = flag; |
| 2524 | |
| 2525 | if (file->f_mode & FMODE_WRITE) { |
| 2526 | mutex_lock(&ftrace_lock); |
| 2527 | iter->hash = alloc_and_copy_ftrace_hash(FTRACE_HASH_DEFAULT_BITS, hash); |
| 2528 | mutex_unlock(&ftrace_lock); |
| 2529 | |
| 2530 | if (!iter->hash) { |
| 2531 | trace_parser_put(&iter->parser); |
| 2532 | kfree(iter); |
| 2533 | return -ENOMEM; |
| 2534 | } |
| 2535 | } |
Steven Rostedt | 1cf41dd7 | 2011-04-29 20:59:51 -0400 | [diff] [blame] | 2536 | |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 2537 | mutex_lock(&ftrace_regex_lock); |
Steven Rostedt | 33dc9b1 | 2011-05-02 17:34:47 -0400 | [diff] [blame] | 2538 | |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2539 | if ((file->f_mode & FMODE_WRITE) && |
Steven Rostedt | 8650ae3 | 2009-07-22 23:29:30 -0400 | [diff] [blame] | 2540 | (file->f_flags & O_TRUNC)) |
Steven Rostedt | 33dc9b1 | 2011-05-02 17:34:47 -0400 | [diff] [blame] | 2541 | ftrace_filter_reset(iter->hash); |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2542 | |
| 2543 | if (file->f_mode & FMODE_READ) { |
| 2544 | iter->pg = ftrace_pages_start; |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2545 | |
| 2546 | ret = seq_open(file, &show_ftrace_seq_ops); |
| 2547 | if (!ret) { |
| 2548 | struct seq_file *m = file->private_data; |
| 2549 | m->private = iter; |
Li Zefan | 79fe249 | 2009-09-22 13:54:28 +0800 | [diff] [blame] | 2550 | } else { |
Steven Rostedt | 33dc9b1 | 2011-05-02 17:34:47 -0400 | [diff] [blame] | 2551 | /* Failed */ |
| 2552 | free_ftrace_hash(iter->hash); |
Li Zefan | 79fe249 | 2009-09-22 13:54:28 +0800 | [diff] [blame] | 2553 | trace_parser_put(&iter->parser); |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2554 | kfree(iter); |
Li Zefan | 79fe249 | 2009-09-22 13:54:28 +0800 | [diff] [blame] | 2555 | } |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2556 | } else |
| 2557 | file->private_data = iter; |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 2558 | mutex_unlock(&ftrace_regex_lock); |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2559 | |
| 2560 | return ret; |
| 2561 | } |
| 2562 | |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 2563 | static int |
| 2564 | ftrace_filter_open(struct inode *inode, struct file *file) |
| 2565 | { |
Steven Rostedt | 69a3083 | 2011-12-19 15:21:16 -0500 | [diff] [blame] | 2566 | return ftrace_regex_open(&global_ops, |
| 2567 | FTRACE_ITER_FILTER | FTRACE_ITER_DO_HASH, |
| 2568 | inode, file); |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 2569 | } |
| 2570 | |
| 2571 | static int |
| 2572 | ftrace_notrace_open(struct inode *inode, struct file *file) |
| 2573 | { |
Steven Rostedt | f45948e | 2011-05-02 12:29:25 -0400 | [diff] [blame] | 2574 | return ftrace_regex_open(&global_ops, FTRACE_ITER_NOTRACE, |
Steven Rostedt | 1cf41dd7 | 2011-04-29 20:59:51 -0400 | [diff] [blame] | 2575 | inode, file); |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 2576 | } |
| 2577 | |
Steven Rostedt | fc13cb0 | 2011-12-19 14:41:25 -0500 | [diff] [blame] | 2578 | loff_t |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 2579 | ftrace_regex_lseek(struct file *file, loff_t offset, int origin) |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2580 | { |
| 2581 | loff_t ret; |
| 2582 | |
| 2583 | if (file->f_mode & FMODE_READ) |
| 2584 | ret = seq_lseek(file, offset, origin); |
| 2585 | else |
| 2586 | file->f_pos = ret = 1; |
| 2587 | |
| 2588 | return ret; |
| 2589 | } |
| 2590 | |
Steven Rostedt | 64e7c44 | 2009-02-13 17:08:48 -0500 | [diff] [blame] | 2591 | static int ftrace_match(char *str, char *regex, int len, int type) |
Steven Rostedt | 9f4801e | 2009-02-13 15:56:43 -0500 | [diff] [blame] | 2592 | { |
Steven Rostedt | 9f4801e | 2009-02-13 15:56:43 -0500 | [diff] [blame] | 2593 | int matched = 0; |
Li Zefan | 751e998 | 2010-01-14 10:53:02 +0800 | [diff] [blame] | 2594 | int slen; |
Steven Rostedt | 9f4801e | 2009-02-13 15:56:43 -0500 | [diff] [blame] | 2595 | |
Steven Rostedt | 9f4801e | 2009-02-13 15:56:43 -0500 | [diff] [blame] | 2596 | switch (type) { |
| 2597 | case MATCH_FULL: |
| 2598 | if (strcmp(str, regex) == 0) |
| 2599 | matched = 1; |
| 2600 | break; |
| 2601 | case MATCH_FRONT_ONLY: |
| 2602 | if (strncmp(str, regex, len) == 0) |
| 2603 | matched = 1; |
| 2604 | break; |
| 2605 | case MATCH_MIDDLE_ONLY: |
| 2606 | if (strstr(str, regex)) |
| 2607 | matched = 1; |
| 2608 | break; |
| 2609 | case MATCH_END_ONLY: |
Li Zefan | 751e998 | 2010-01-14 10:53:02 +0800 | [diff] [blame] | 2610 | slen = strlen(str); |
| 2611 | if (slen >= len && memcmp(str + slen - len, regex, len) == 0) |
Steven Rostedt | 9f4801e | 2009-02-13 15:56:43 -0500 | [diff] [blame] | 2612 | matched = 1; |
| 2613 | break; |
| 2614 | } |
| 2615 | |
| 2616 | return matched; |
| 2617 | } |
| 2618 | |
Steven Rostedt | b448c4e | 2011-04-29 15:12:32 -0400 | [diff] [blame] | 2619 | static int |
Steven Rostedt | 1cf41dd7 | 2011-04-29 20:59:51 -0400 | [diff] [blame] | 2620 | enter_record(struct ftrace_hash *hash, struct dyn_ftrace *rec, int not) |
Steven Rostedt | 996e87b | 2011-04-26 16:11:03 -0400 | [diff] [blame] | 2621 | { |
Steven Rostedt | b448c4e | 2011-04-29 15:12:32 -0400 | [diff] [blame] | 2622 | struct ftrace_func_entry *entry; |
Steven Rostedt | b448c4e | 2011-04-29 15:12:32 -0400 | [diff] [blame] | 2623 | int ret = 0; |
| 2624 | |
Steven Rostedt | 1cf41dd7 | 2011-04-29 20:59:51 -0400 | [diff] [blame] | 2625 | entry = ftrace_lookup_ip(hash, rec->ip); |
| 2626 | if (not) { |
| 2627 | /* Do nothing if it doesn't exist */ |
| 2628 | if (!entry) |
| 2629 | return 0; |
| 2630 | |
Steven Rostedt | 33dc9b1 | 2011-05-02 17:34:47 -0400 | [diff] [blame] | 2631 | free_hash_entry(hash, entry); |
Steven Rostedt | b448c4e | 2011-04-29 15:12:32 -0400 | [diff] [blame] | 2632 | } else { |
Steven Rostedt | 1cf41dd7 | 2011-04-29 20:59:51 -0400 | [diff] [blame] | 2633 | /* Do nothing if it exists */ |
| 2634 | if (entry) |
| 2635 | return 0; |
Steven Rostedt | b448c4e | 2011-04-29 15:12:32 -0400 | [diff] [blame] | 2636 | |
Steven Rostedt | 1cf41dd7 | 2011-04-29 20:59:51 -0400 | [diff] [blame] | 2637 | ret = add_hash_entry(hash, rec->ip); |
Steven Rostedt | b448c4e | 2011-04-29 15:12:32 -0400 | [diff] [blame] | 2638 | } |
| 2639 | return ret; |
Steven Rostedt | 996e87b | 2011-04-26 16:11:03 -0400 | [diff] [blame] | 2640 | } |
| 2641 | |
Steven Rostedt | 64e7c44 | 2009-02-13 17:08:48 -0500 | [diff] [blame] | 2642 | static int |
Steven Rostedt | b9df92d | 2011-04-28 20:32:08 -0400 | [diff] [blame] | 2643 | ftrace_match_record(struct dyn_ftrace *rec, char *mod, |
| 2644 | char *regex, int len, int type) |
Steven Rostedt | 64e7c44 | 2009-02-13 17:08:48 -0500 | [diff] [blame] | 2645 | { |
| 2646 | char str[KSYM_SYMBOL_LEN]; |
Steven Rostedt | b9df92d | 2011-04-28 20:32:08 -0400 | [diff] [blame] | 2647 | char *modname; |
Steven Rostedt | 64e7c44 | 2009-02-13 17:08:48 -0500 | [diff] [blame] | 2648 | |
Steven Rostedt | b9df92d | 2011-04-28 20:32:08 -0400 | [diff] [blame] | 2649 | kallsyms_lookup(rec->ip, NULL, NULL, &modname, str); |
| 2650 | |
| 2651 | if (mod) { |
| 2652 | /* module lookup requires matching the module */ |
| 2653 | if (!modname || strcmp(modname, mod)) |
| 2654 | return 0; |
| 2655 | |
| 2656 | /* blank search means to match all funcs in the mod */ |
| 2657 | if (!len) |
| 2658 | return 1; |
| 2659 | } |
| 2660 | |
Steven Rostedt | 64e7c44 | 2009-02-13 17:08:48 -0500 | [diff] [blame] | 2661 | return ftrace_match(str, regex, len, type); |
| 2662 | } |
| 2663 | |
Steven Rostedt | 1cf41dd7 | 2011-04-29 20:59:51 -0400 | [diff] [blame] | 2664 | static int |
| 2665 | match_records(struct ftrace_hash *hash, char *buff, |
| 2666 | int len, char *mod, int not) |
Steven Rostedt | 9f4801e | 2009-02-13 15:56:43 -0500 | [diff] [blame] | 2667 | { |
Steven Rostedt | b9df92d | 2011-04-28 20:32:08 -0400 | [diff] [blame] | 2668 | unsigned search_len = 0; |
Steven Rostedt | 9f4801e | 2009-02-13 15:56:43 -0500 | [diff] [blame] | 2669 | struct ftrace_page *pg; |
| 2670 | struct dyn_ftrace *rec; |
Steven Rostedt | b9df92d | 2011-04-28 20:32:08 -0400 | [diff] [blame] | 2671 | int type = MATCH_FULL; |
| 2672 | char *search = buff; |
Li Zefan | 311d16d | 2009-12-08 11:15:11 +0800 | [diff] [blame] | 2673 | int found = 0; |
Steven Rostedt | b448c4e | 2011-04-29 15:12:32 -0400 | [diff] [blame] | 2674 | int ret; |
Steven Rostedt | 9f4801e | 2009-02-13 15:56:43 -0500 | [diff] [blame] | 2675 | |
Steven Rostedt | b9df92d | 2011-04-28 20:32:08 -0400 | [diff] [blame] | 2676 | if (len) { |
| 2677 | type = filter_parse_regex(buff, len, &search, ¬); |
| 2678 | search_len = strlen(search); |
| 2679 | } |
Steven Rostedt | 9f4801e | 2009-02-13 15:56:43 -0500 | [diff] [blame] | 2680 | |
Steven Rostedt | 52baf11 | 2009-02-14 01:15:39 -0500 | [diff] [blame] | 2681 | mutex_lock(&ftrace_lock); |
Steven Rostedt | b9df92d | 2011-04-28 20:32:08 -0400 | [diff] [blame] | 2682 | |
| 2683 | if (unlikely(ftrace_disabled)) |
| 2684 | goto out_unlock; |
| 2685 | |
Steven Rostedt | 265c831 | 2009-02-13 12:43:56 -0500 | [diff] [blame] | 2686 | do_for_each_ftrace_rec(pg, rec) { |
Steven Rostedt | b9df92d | 2011-04-28 20:32:08 -0400 | [diff] [blame] | 2687 | if (ftrace_match_record(rec, mod, search, search_len, type)) { |
Steven Rostedt | 1cf41dd7 | 2011-04-29 20:59:51 -0400 | [diff] [blame] | 2688 | ret = enter_record(hash, rec, not); |
Steven Rostedt | b448c4e | 2011-04-29 15:12:32 -0400 | [diff] [blame] | 2689 | if (ret < 0) { |
| 2690 | found = ret; |
| 2691 | goto out_unlock; |
| 2692 | } |
Li Zefan | 311d16d | 2009-12-08 11:15:11 +0800 | [diff] [blame] | 2693 | found = 1; |
Steven Rostedt | 265c831 | 2009-02-13 12:43:56 -0500 | [diff] [blame] | 2694 | } |
| 2695 | } while_for_each_ftrace_rec(); |
Steven Rostedt | b9df92d | 2011-04-28 20:32:08 -0400 | [diff] [blame] | 2696 | out_unlock: |
Steven Rostedt | 52baf11 | 2009-02-14 01:15:39 -0500 | [diff] [blame] | 2697 | mutex_unlock(&ftrace_lock); |
Li Zefan | 311d16d | 2009-12-08 11:15:11 +0800 | [diff] [blame] | 2698 | |
| 2699 | return found; |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2700 | } |
| 2701 | |
Steven Rostedt | 64e7c44 | 2009-02-13 17:08:48 -0500 | [diff] [blame] | 2702 | static int |
Steven Rostedt | 1cf41dd7 | 2011-04-29 20:59:51 -0400 | [diff] [blame] | 2703 | ftrace_match_records(struct ftrace_hash *hash, char *buff, int len) |
Steven Rostedt | 64e7c44 | 2009-02-13 17:08:48 -0500 | [diff] [blame] | 2704 | { |
Steven Rostedt | 1cf41dd7 | 2011-04-29 20:59:51 -0400 | [diff] [blame] | 2705 | return match_records(hash, buff, len, NULL, 0); |
Steven Rostedt | 64e7c44 | 2009-02-13 17:08:48 -0500 | [diff] [blame] | 2706 | } |
| 2707 | |
Steven Rostedt | 1cf41dd7 | 2011-04-29 20:59:51 -0400 | [diff] [blame] | 2708 | static int |
| 2709 | ftrace_match_module_records(struct ftrace_hash *hash, char *buff, char *mod) |
Steven Rostedt | 64e7c44 | 2009-02-13 17:08:48 -0500 | [diff] [blame] | 2710 | { |
Steven Rostedt | 64e7c44 | 2009-02-13 17:08:48 -0500 | [diff] [blame] | 2711 | int not = 0; |
Steven Rostedt | 6a24a24 | 2009-02-17 11:20:26 -0500 | [diff] [blame] | 2712 | |
Steven Rostedt | 64e7c44 | 2009-02-13 17:08:48 -0500 | [diff] [blame] | 2713 | /* blank or '*' mean the same */ |
| 2714 | if (strcmp(buff, "*") == 0) |
| 2715 | buff[0] = 0; |
| 2716 | |
| 2717 | /* handle the case of 'dont filter this module' */ |
| 2718 | if (strcmp(buff, "!") == 0 || strcmp(buff, "!*") == 0) { |
| 2719 | buff[0] = 0; |
| 2720 | not = 1; |
| 2721 | } |
| 2722 | |
Steven Rostedt | 1cf41dd7 | 2011-04-29 20:59:51 -0400 | [diff] [blame] | 2723 | return match_records(hash, buff, strlen(buff), mod, not); |
Steven Rostedt | 64e7c44 | 2009-02-13 17:08:48 -0500 | [diff] [blame] | 2724 | } |
| 2725 | |
Steven Rostedt | f618077 | 2009-02-14 00:40:25 -0500 | [diff] [blame] | 2726 | /* |
| 2727 | * We register the module command as a template to show others how |
| 2728 | * to register the a command as well. |
| 2729 | */ |
| 2730 | |
| 2731 | static int |
Steven Rostedt | 43dd61c | 2011-07-07 11:09:22 -0400 | [diff] [blame] | 2732 | ftrace_mod_callback(struct ftrace_hash *hash, |
| 2733 | char *func, char *cmd, char *param, int enable) |
Steven Rostedt | f618077 | 2009-02-14 00:40:25 -0500 | [diff] [blame] | 2734 | { |
| 2735 | char *mod; |
Steven Rostedt | b448c4e | 2011-04-29 15:12:32 -0400 | [diff] [blame] | 2736 | int ret = -EINVAL; |
Steven Rostedt | f618077 | 2009-02-14 00:40:25 -0500 | [diff] [blame] | 2737 | |
| 2738 | /* |
| 2739 | * cmd == 'mod' because we only registered this func |
| 2740 | * for the 'mod' ftrace_func_command. |
| 2741 | * But if you register one func with multiple commands, |
| 2742 | * you can tell which command was used by the cmd |
| 2743 | * parameter. |
| 2744 | */ |
| 2745 | |
| 2746 | /* we must have a module name */ |
| 2747 | if (!param) |
Steven Rostedt | b448c4e | 2011-04-29 15:12:32 -0400 | [diff] [blame] | 2748 | return ret; |
Steven Rostedt | f618077 | 2009-02-14 00:40:25 -0500 | [diff] [blame] | 2749 | |
| 2750 | mod = strsep(¶m, ":"); |
| 2751 | if (!strlen(mod)) |
Steven Rostedt | b448c4e | 2011-04-29 15:12:32 -0400 | [diff] [blame] | 2752 | return ret; |
Steven Rostedt | f618077 | 2009-02-14 00:40:25 -0500 | [diff] [blame] | 2753 | |
Steven Rostedt | 1cf41dd7 | 2011-04-29 20:59:51 -0400 | [diff] [blame] | 2754 | ret = ftrace_match_module_records(hash, func, mod); |
Steven Rostedt | b448c4e | 2011-04-29 15:12:32 -0400 | [diff] [blame] | 2755 | if (!ret) |
| 2756 | ret = -EINVAL; |
| 2757 | if (ret < 0) |
| 2758 | return ret; |
| 2759 | |
| 2760 | return 0; |
Steven Rostedt | f618077 | 2009-02-14 00:40:25 -0500 | [diff] [blame] | 2761 | } |
| 2762 | |
| 2763 | static struct ftrace_func_command ftrace_mod_cmd = { |
| 2764 | .name = "mod", |
| 2765 | .func = ftrace_mod_callback, |
| 2766 | }; |
| 2767 | |
| 2768 | static int __init ftrace_mod_cmd_init(void) |
| 2769 | { |
| 2770 | return register_ftrace_command(&ftrace_mod_cmd); |
| 2771 | } |
| 2772 | device_initcall(ftrace_mod_cmd_init); |
| 2773 | |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 2774 | static void |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 2775 | function_trace_probe_call(unsigned long ip, unsigned long parent_ip) |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 2776 | { |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 2777 | struct ftrace_func_probe *entry; |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 2778 | struct hlist_head *hhd; |
| 2779 | struct hlist_node *n; |
| 2780 | unsigned long key; |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 2781 | |
| 2782 | key = hash_long(ip, FTRACE_HASH_BITS); |
| 2783 | |
| 2784 | hhd = &ftrace_func_hash[key]; |
| 2785 | |
| 2786 | if (hlist_empty(hhd)) |
| 2787 | return; |
| 2788 | |
| 2789 | /* |
| 2790 | * Disable preemption for these calls to prevent a RCU grace |
| 2791 | * period. This syncs the hash iteration and freeing of items |
| 2792 | * on the hash. rcu_read_lock is too dangerous here. |
| 2793 | */ |
Steven Rostedt | 5168ae5 | 2010-06-03 09:36:50 -0400 | [diff] [blame] | 2794 | preempt_disable_notrace(); |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 2795 | hlist_for_each_entry_rcu(entry, n, hhd, node) { |
| 2796 | if (entry->ip == ip) |
| 2797 | entry->ops->func(ip, parent_ip, &entry->data); |
| 2798 | } |
Steven Rostedt | 5168ae5 | 2010-06-03 09:36:50 -0400 | [diff] [blame] | 2799 | preempt_enable_notrace(); |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 2800 | } |
| 2801 | |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 2802 | static struct ftrace_ops trace_probe_ops __read_mostly = |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 2803 | { |
Steven Rostedt | fb9fb01 | 2009-03-25 13:26:41 -0400 | [diff] [blame] | 2804 | .func = function_trace_probe_call, |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 2805 | }; |
| 2806 | |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 2807 | static int ftrace_probe_registered; |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 2808 | |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 2809 | static void __enable_ftrace_function_probe(void) |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 2810 | { |
Steven Rostedt | b848914 | 2011-05-04 09:27:52 -0400 | [diff] [blame] | 2811 | int ret; |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 2812 | int i; |
| 2813 | |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 2814 | if (ftrace_probe_registered) |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 2815 | return; |
| 2816 | |
| 2817 | for (i = 0; i < FTRACE_FUNC_HASHSIZE; i++) { |
| 2818 | struct hlist_head *hhd = &ftrace_func_hash[i]; |
| 2819 | if (hhd->first) |
| 2820 | break; |
| 2821 | } |
| 2822 | /* Nothing registered? */ |
| 2823 | if (i == FTRACE_FUNC_HASHSIZE) |
| 2824 | return; |
| 2825 | |
Steven Rostedt | b848914 | 2011-05-04 09:27:52 -0400 | [diff] [blame] | 2826 | ret = __register_ftrace_function(&trace_probe_ops); |
| 2827 | if (!ret) |
Steven Rostedt | a1cd617 | 2011-05-23 15:24:25 -0400 | [diff] [blame] | 2828 | ret = ftrace_startup(&trace_probe_ops, 0); |
Steven Rostedt | b848914 | 2011-05-04 09:27:52 -0400 | [diff] [blame] | 2829 | |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 2830 | ftrace_probe_registered = 1; |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 2831 | } |
| 2832 | |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 2833 | static void __disable_ftrace_function_probe(void) |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 2834 | { |
Steven Rostedt | b848914 | 2011-05-04 09:27:52 -0400 | [diff] [blame] | 2835 | int ret; |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 2836 | int i; |
| 2837 | |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 2838 | if (!ftrace_probe_registered) |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 2839 | return; |
| 2840 | |
| 2841 | for (i = 0; i < FTRACE_FUNC_HASHSIZE; i++) { |
| 2842 | struct hlist_head *hhd = &ftrace_func_hash[i]; |
| 2843 | if (hhd->first) |
| 2844 | return; |
| 2845 | } |
| 2846 | |
| 2847 | /* no more funcs left */ |
Steven Rostedt | b848914 | 2011-05-04 09:27:52 -0400 | [diff] [blame] | 2848 | ret = __unregister_ftrace_function(&trace_probe_ops); |
| 2849 | if (!ret) |
| 2850 | ftrace_shutdown(&trace_probe_ops, 0); |
| 2851 | |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 2852 | ftrace_probe_registered = 0; |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 2853 | } |
| 2854 | |
| 2855 | |
| 2856 | static void ftrace_free_entry_rcu(struct rcu_head *rhp) |
| 2857 | { |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 2858 | struct ftrace_func_probe *entry = |
| 2859 | container_of(rhp, struct ftrace_func_probe, rcu); |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 2860 | |
| 2861 | if (entry->ops->free) |
| 2862 | entry->ops->free(&entry->data); |
| 2863 | kfree(entry); |
| 2864 | } |
| 2865 | |
| 2866 | |
| 2867 | int |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 2868 | register_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops, |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 2869 | void *data) |
| 2870 | { |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 2871 | struct ftrace_func_probe *entry; |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 2872 | struct ftrace_page *pg; |
| 2873 | struct dyn_ftrace *rec; |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 2874 | int type, len, not; |
Steven Rostedt | 6a24a24 | 2009-02-17 11:20:26 -0500 | [diff] [blame] | 2875 | unsigned long key; |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 2876 | int count = 0; |
| 2877 | char *search; |
| 2878 | |
Frederic Weisbecker | 3f6fe06 | 2009-09-24 21:31:51 +0200 | [diff] [blame] | 2879 | type = filter_parse_regex(glob, strlen(glob), &search, ¬); |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 2880 | len = strlen(search); |
| 2881 | |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 2882 | /* we do not support '!' for function probes */ |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 2883 | if (WARN_ON(not)) |
| 2884 | return -EINVAL; |
| 2885 | |
| 2886 | mutex_lock(&ftrace_lock); |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 2887 | |
Steven Rostedt | 45a4a23 | 2011-04-21 23:16:46 -0400 | [diff] [blame] | 2888 | if (unlikely(ftrace_disabled)) |
| 2889 | goto out_unlock; |
| 2890 | |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 2891 | do_for_each_ftrace_rec(pg, rec) { |
| 2892 | |
Steven Rostedt | b9df92d | 2011-04-28 20:32:08 -0400 | [diff] [blame] | 2893 | if (!ftrace_match_record(rec, NULL, search, len, type)) |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 2894 | continue; |
| 2895 | |
| 2896 | entry = kmalloc(sizeof(*entry), GFP_KERNEL); |
| 2897 | if (!entry) { |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 2898 | /* If we did not process any, then return error */ |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 2899 | if (!count) |
| 2900 | count = -ENOMEM; |
| 2901 | goto out_unlock; |
| 2902 | } |
| 2903 | |
| 2904 | count++; |
| 2905 | |
| 2906 | entry->data = data; |
| 2907 | |
| 2908 | /* |
| 2909 | * The caller might want to do something special |
| 2910 | * for each function we find. We call the callback |
| 2911 | * to give the caller an opportunity to do so. |
| 2912 | */ |
| 2913 | if (ops->callback) { |
| 2914 | if (ops->callback(rec->ip, &entry->data) < 0) { |
| 2915 | /* caller does not like this func */ |
| 2916 | kfree(entry); |
| 2917 | continue; |
| 2918 | } |
| 2919 | } |
| 2920 | |
| 2921 | entry->ops = ops; |
| 2922 | entry->ip = rec->ip; |
| 2923 | |
| 2924 | key = hash_long(entry->ip, FTRACE_HASH_BITS); |
| 2925 | hlist_add_head_rcu(&entry->node, &ftrace_func_hash[key]); |
| 2926 | |
| 2927 | } while_for_each_ftrace_rec(); |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 2928 | __enable_ftrace_function_probe(); |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 2929 | |
| 2930 | out_unlock: |
| 2931 | mutex_unlock(&ftrace_lock); |
| 2932 | |
| 2933 | return count; |
| 2934 | } |
| 2935 | |
| 2936 | enum { |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 2937 | PROBE_TEST_FUNC = 1, |
| 2938 | PROBE_TEST_DATA = 2 |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 2939 | }; |
| 2940 | |
| 2941 | static void |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 2942 | __unregister_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops, |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 2943 | void *data, int flags) |
| 2944 | { |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 2945 | struct ftrace_func_probe *entry; |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 2946 | struct hlist_node *n, *tmp; |
| 2947 | char str[KSYM_SYMBOL_LEN]; |
| 2948 | int type = MATCH_FULL; |
| 2949 | int i, len = 0; |
| 2950 | char *search; |
| 2951 | |
Atsushi Tsuji | b36461d | 2009-09-15 19:06:30 +0900 | [diff] [blame] | 2952 | if (glob && (strcmp(glob, "*") == 0 || !strlen(glob))) |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 2953 | glob = NULL; |
Atsushi Tsuji | b36461d | 2009-09-15 19:06:30 +0900 | [diff] [blame] | 2954 | else if (glob) { |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 2955 | int not; |
| 2956 | |
Frederic Weisbecker | 3f6fe06 | 2009-09-24 21:31:51 +0200 | [diff] [blame] | 2957 | type = filter_parse_regex(glob, strlen(glob), &search, ¬); |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 2958 | len = strlen(search); |
| 2959 | |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 2960 | /* we do not support '!' for function probes */ |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 2961 | if (WARN_ON(not)) |
| 2962 | return; |
| 2963 | } |
| 2964 | |
| 2965 | mutex_lock(&ftrace_lock); |
| 2966 | for (i = 0; i < FTRACE_FUNC_HASHSIZE; i++) { |
| 2967 | struct hlist_head *hhd = &ftrace_func_hash[i]; |
| 2968 | |
| 2969 | hlist_for_each_entry_safe(entry, n, tmp, hhd, node) { |
| 2970 | |
| 2971 | /* break up if statements for readability */ |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 2972 | if ((flags & PROBE_TEST_FUNC) && entry->ops != ops) |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 2973 | continue; |
| 2974 | |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 2975 | if ((flags & PROBE_TEST_DATA) && entry->data != data) |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 2976 | continue; |
| 2977 | |
| 2978 | /* do this last, since it is the most expensive */ |
| 2979 | if (glob) { |
| 2980 | kallsyms_lookup(entry->ip, NULL, NULL, |
| 2981 | NULL, str); |
| 2982 | if (!ftrace_match(str, glob, len, type)) |
| 2983 | continue; |
| 2984 | } |
| 2985 | |
| 2986 | hlist_del(&entry->node); |
| 2987 | call_rcu(&entry->rcu, ftrace_free_entry_rcu); |
| 2988 | } |
| 2989 | } |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 2990 | __disable_ftrace_function_probe(); |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 2991 | mutex_unlock(&ftrace_lock); |
| 2992 | } |
| 2993 | |
| 2994 | void |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 2995 | unregister_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops, |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 2996 | void *data) |
| 2997 | { |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 2998 | __unregister_ftrace_function_probe(glob, ops, data, |
| 2999 | PROBE_TEST_FUNC | PROBE_TEST_DATA); |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 3000 | } |
| 3001 | |
| 3002 | void |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 3003 | unregister_ftrace_function_probe_func(char *glob, struct ftrace_probe_ops *ops) |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 3004 | { |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 3005 | __unregister_ftrace_function_probe(glob, ops, NULL, PROBE_TEST_FUNC); |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 3006 | } |
| 3007 | |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 3008 | void unregister_ftrace_function_probe_all(char *glob) |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 3009 | { |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 3010 | __unregister_ftrace_function_probe(glob, NULL, NULL, 0); |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 3011 | } |
| 3012 | |
Steven Rostedt | f618077 | 2009-02-14 00:40:25 -0500 | [diff] [blame] | 3013 | static LIST_HEAD(ftrace_commands); |
| 3014 | static DEFINE_MUTEX(ftrace_cmd_mutex); |
| 3015 | |
| 3016 | int register_ftrace_command(struct ftrace_func_command *cmd) |
| 3017 | { |
| 3018 | struct ftrace_func_command *p; |
| 3019 | int ret = 0; |
| 3020 | |
| 3021 | mutex_lock(&ftrace_cmd_mutex); |
| 3022 | list_for_each_entry(p, &ftrace_commands, list) { |
| 3023 | if (strcmp(cmd->name, p->name) == 0) { |
| 3024 | ret = -EBUSY; |
| 3025 | goto out_unlock; |
| 3026 | } |
| 3027 | } |
| 3028 | list_add(&cmd->list, &ftrace_commands); |
| 3029 | out_unlock: |
| 3030 | mutex_unlock(&ftrace_cmd_mutex); |
| 3031 | |
| 3032 | return ret; |
| 3033 | } |
| 3034 | |
| 3035 | int unregister_ftrace_command(struct ftrace_func_command *cmd) |
| 3036 | { |
| 3037 | struct ftrace_func_command *p, *n; |
| 3038 | int ret = -ENODEV; |
| 3039 | |
| 3040 | mutex_lock(&ftrace_cmd_mutex); |
| 3041 | list_for_each_entry_safe(p, n, &ftrace_commands, list) { |
| 3042 | if (strcmp(cmd->name, p->name) == 0) { |
| 3043 | ret = 0; |
| 3044 | list_del_init(&p->list); |
| 3045 | goto out_unlock; |
| 3046 | } |
| 3047 | } |
| 3048 | out_unlock: |
| 3049 | mutex_unlock(&ftrace_cmd_mutex); |
| 3050 | |
| 3051 | return ret; |
| 3052 | } |
| 3053 | |
Steven Rostedt | 33dc9b1 | 2011-05-02 17:34:47 -0400 | [diff] [blame] | 3054 | static int ftrace_process_regex(struct ftrace_hash *hash, |
| 3055 | char *buff, int len, int enable) |
Steven Rostedt | 64e7c44 | 2009-02-13 17:08:48 -0500 | [diff] [blame] | 3056 | { |
Steven Rostedt | f618077 | 2009-02-14 00:40:25 -0500 | [diff] [blame] | 3057 | char *func, *command, *next = buff; |
Steven Rostedt | 6a24a24 | 2009-02-17 11:20:26 -0500 | [diff] [blame] | 3058 | struct ftrace_func_command *p; |
GuoWen Li | 0aff1c0 | 2011-06-01 19:18:47 +0800 | [diff] [blame] | 3059 | int ret = -EINVAL; |
Steven Rostedt | 64e7c44 | 2009-02-13 17:08:48 -0500 | [diff] [blame] | 3060 | |
| 3061 | func = strsep(&next, ":"); |
| 3062 | |
| 3063 | if (!next) { |
Steven Rostedt | 1cf41dd7 | 2011-04-29 20:59:51 -0400 | [diff] [blame] | 3064 | ret = ftrace_match_records(hash, func, len); |
Steven Rostedt | b448c4e | 2011-04-29 15:12:32 -0400 | [diff] [blame] | 3065 | if (!ret) |
| 3066 | ret = -EINVAL; |
| 3067 | if (ret < 0) |
| 3068 | return ret; |
| 3069 | return 0; |
Steven Rostedt | 64e7c44 | 2009-02-13 17:08:48 -0500 | [diff] [blame] | 3070 | } |
| 3071 | |
Steven Rostedt | f618077 | 2009-02-14 00:40:25 -0500 | [diff] [blame] | 3072 | /* command found */ |
Steven Rostedt | 64e7c44 | 2009-02-13 17:08:48 -0500 | [diff] [blame] | 3073 | |
| 3074 | command = strsep(&next, ":"); |
| 3075 | |
Steven Rostedt | f618077 | 2009-02-14 00:40:25 -0500 | [diff] [blame] | 3076 | mutex_lock(&ftrace_cmd_mutex); |
| 3077 | list_for_each_entry(p, &ftrace_commands, list) { |
| 3078 | if (strcmp(p->name, command) == 0) { |
Steven Rostedt | 43dd61c | 2011-07-07 11:09:22 -0400 | [diff] [blame] | 3079 | ret = p->func(hash, func, command, next, enable); |
Steven Rostedt | f618077 | 2009-02-14 00:40:25 -0500 | [diff] [blame] | 3080 | goto out_unlock; |
| 3081 | } |
Steven Rostedt | 64e7c44 | 2009-02-13 17:08:48 -0500 | [diff] [blame] | 3082 | } |
Steven Rostedt | f618077 | 2009-02-14 00:40:25 -0500 | [diff] [blame] | 3083 | out_unlock: |
| 3084 | mutex_unlock(&ftrace_cmd_mutex); |
Steven Rostedt | 64e7c44 | 2009-02-13 17:08:48 -0500 | [diff] [blame] | 3085 | |
Steven Rostedt | f618077 | 2009-02-14 00:40:25 -0500 | [diff] [blame] | 3086 | return ret; |
Steven Rostedt | 64e7c44 | 2009-02-13 17:08:48 -0500 | [diff] [blame] | 3087 | } |
| 3088 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 3089 | static ssize_t |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 3090 | ftrace_regex_write(struct file *file, const char __user *ubuf, |
| 3091 | size_t cnt, loff_t *ppos, int enable) |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3092 | { |
| 3093 | struct ftrace_iterator *iter; |
jolsa@redhat.com | 689fd8b | 2009-09-11 17:29:29 +0200 | [diff] [blame] | 3094 | struct trace_parser *parser; |
| 3095 | ssize_t ret, read; |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3096 | |
Li Zefan | 4ba7978 | 2009-09-22 13:52:20 +0800 | [diff] [blame] | 3097 | if (!cnt) |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3098 | return 0; |
| 3099 | |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 3100 | mutex_lock(&ftrace_regex_lock); |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3101 | |
Steven Rostedt | 45a4a23 | 2011-04-21 23:16:46 -0400 | [diff] [blame] | 3102 | ret = -ENODEV; |
| 3103 | if (unlikely(ftrace_disabled)) |
| 3104 | goto out_unlock; |
| 3105 | |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3106 | if (file->f_mode & FMODE_READ) { |
| 3107 | struct seq_file *m = file->private_data; |
| 3108 | iter = m->private; |
| 3109 | } else |
| 3110 | iter = file->private_data; |
| 3111 | |
jolsa@redhat.com | 689fd8b | 2009-09-11 17:29:29 +0200 | [diff] [blame] | 3112 | parser = &iter->parser; |
| 3113 | read = trace_get_user(parser, ubuf, cnt, ppos); |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3114 | |
Li Zefan | 4ba7978 | 2009-09-22 13:52:20 +0800 | [diff] [blame] | 3115 | if (read >= 0 && trace_parser_loaded(parser) && |
jolsa@redhat.com | 689fd8b | 2009-09-11 17:29:29 +0200 | [diff] [blame] | 3116 | !trace_parser_cont(parser)) { |
Steven Rostedt | 33dc9b1 | 2011-05-02 17:34:47 -0400 | [diff] [blame] | 3117 | ret = ftrace_process_regex(iter->hash, parser->buffer, |
jolsa@redhat.com | 689fd8b | 2009-09-11 17:29:29 +0200 | [diff] [blame] | 3118 | parser->idx, enable); |
Li Zefan | 313254a | 2009-12-08 11:15:30 +0800 | [diff] [blame] | 3119 | trace_parser_clear(parser); |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3120 | if (ret) |
Li Zefan | ed146b25 | 2009-11-03 08:55:38 +0800 | [diff] [blame] | 3121 | goto out_unlock; |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3122 | } |
| 3123 | |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3124 | ret = read; |
Li Zefan | ed146b25 | 2009-11-03 08:55:38 +0800 | [diff] [blame] | 3125 | out_unlock: |
jolsa@redhat.com | 689fd8b | 2009-09-11 17:29:29 +0200 | [diff] [blame] | 3126 | mutex_unlock(&ftrace_regex_lock); |
Li Zefan | ed146b25 | 2009-11-03 08:55:38 +0800 | [diff] [blame] | 3127 | |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3128 | return ret; |
| 3129 | } |
| 3130 | |
Steven Rostedt | fc13cb0 | 2011-12-19 14:41:25 -0500 | [diff] [blame] | 3131 | ssize_t |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 3132 | ftrace_filter_write(struct file *file, const char __user *ubuf, |
| 3133 | size_t cnt, loff_t *ppos) |
| 3134 | { |
| 3135 | return ftrace_regex_write(file, ubuf, cnt, ppos, 1); |
| 3136 | } |
| 3137 | |
Steven Rostedt | fc13cb0 | 2011-12-19 14:41:25 -0500 | [diff] [blame] | 3138 | ssize_t |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 3139 | ftrace_notrace_write(struct file *file, const char __user *ubuf, |
| 3140 | size_t cnt, loff_t *ppos) |
| 3141 | { |
| 3142 | return ftrace_regex_write(file, ubuf, cnt, ppos, 0); |
| 3143 | } |
| 3144 | |
Steven Rostedt | 33dc9b1 | 2011-05-02 17:34:47 -0400 | [diff] [blame] | 3145 | static int |
Steven Rostedt | f45948e | 2011-05-02 12:29:25 -0400 | [diff] [blame] | 3146 | ftrace_set_regex(struct ftrace_ops *ops, unsigned char *buf, int len, |
| 3147 | int reset, int enable) |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 3148 | { |
Steven Rostedt | 33dc9b1 | 2011-05-02 17:34:47 -0400 | [diff] [blame] | 3149 | struct ftrace_hash **orig_hash; |
Steven Rostedt | f45948e | 2011-05-02 12:29:25 -0400 | [diff] [blame] | 3150 | struct ftrace_hash *hash; |
Steven Rostedt | 33dc9b1 | 2011-05-02 17:34:47 -0400 | [diff] [blame] | 3151 | int ret; |
Steven Rostedt | f45948e | 2011-05-02 12:29:25 -0400 | [diff] [blame] | 3152 | |
Steven Rostedt | 936e074 | 2011-05-05 22:54:01 -0400 | [diff] [blame] | 3153 | /* All global ops uses the global ops filters */ |
| 3154 | if (ops->flags & FTRACE_OPS_FL_GLOBAL) |
| 3155 | ops = &global_ops; |
| 3156 | |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 3157 | if (unlikely(ftrace_disabled)) |
Steven Rostedt | 33dc9b1 | 2011-05-02 17:34:47 -0400 | [diff] [blame] | 3158 | return -ENODEV; |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 3159 | |
Steven Rostedt | f45948e | 2011-05-02 12:29:25 -0400 | [diff] [blame] | 3160 | if (enable) |
Steven Rostedt | 33dc9b1 | 2011-05-02 17:34:47 -0400 | [diff] [blame] | 3161 | orig_hash = &ops->filter_hash; |
Steven Rostedt | f45948e | 2011-05-02 12:29:25 -0400 | [diff] [blame] | 3162 | else |
Steven Rostedt | 33dc9b1 | 2011-05-02 17:34:47 -0400 | [diff] [blame] | 3163 | orig_hash = &ops->notrace_hash; |
| 3164 | |
| 3165 | hash = alloc_and_copy_ftrace_hash(FTRACE_HASH_DEFAULT_BITS, *orig_hash); |
| 3166 | if (!hash) |
| 3167 | return -ENOMEM; |
Steven Rostedt | f45948e | 2011-05-02 12:29:25 -0400 | [diff] [blame] | 3168 | |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 3169 | mutex_lock(&ftrace_regex_lock); |
| 3170 | if (reset) |
Steven Rostedt | 1cf41dd7 | 2011-04-29 20:59:51 -0400 | [diff] [blame] | 3171 | ftrace_filter_reset(hash); |
Jiri Olsa | ac483c4 | 2012-01-02 10:04:14 +0100 | [diff] [blame] | 3172 | if (buf && !ftrace_match_records(hash, buf, len)) { |
| 3173 | ret = -EINVAL; |
| 3174 | goto out_regex_unlock; |
| 3175 | } |
Steven Rostedt | 33dc9b1 | 2011-05-02 17:34:47 -0400 | [diff] [blame] | 3176 | |
| 3177 | mutex_lock(&ftrace_lock); |
Steven Rostedt | 41fb61c | 2011-07-13 15:03:44 -0400 | [diff] [blame] | 3178 | ret = ftrace_hash_move(ops, enable, orig_hash, hash); |
Steven Rostedt | 072126f | 2011-07-13 15:08:31 -0400 | [diff] [blame] | 3179 | if (!ret && ops->flags & FTRACE_OPS_FL_ENABLED |
| 3180 | && ftrace_enabled) |
Jiri Olsa | 30fb6aa | 2011-12-05 18:22:48 +0100 | [diff] [blame] | 3181 | ftrace_run_update_code(FTRACE_UPDATE_CALLS); |
Steven Rostedt | 072126f | 2011-07-13 15:08:31 -0400 | [diff] [blame] | 3182 | |
Steven Rostedt | 33dc9b1 | 2011-05-02 17:34:47 -0400 | [diff] [blame] | 3183 | mutex_unlock(&ftrace_lock); |
| 3184 | |
Jiri Olsa | ac483c4 | 2012-01-02 10:04:14 +0100 | [diff] [blame] | 3185 | out_regex_unlock: |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 3186 | mutex_unlock(&ftrace_regex_lock); |
Steven Rostedt | 33dc9b1 | 2011-05-02 17:34:47 -0400 | [diff] [blame] | 3187 | |
| 3188 | free_ftrace_hash(hash); |
| 3189 | return ret; |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 3190 | } |
| 3191 | |
Steven Rostedt | 77a2b37 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 3192 | /** |
| 3193 | * ftrace_set_filter - set a function to filter on in ftrace |
Steven Rostedt | 936e074 | 2011-05-05 22:54:01 -0400 | [diff] [blame] | 3194 | * @ops - the ops to set the filter with |
Steven Rostedt | 77a2b37 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 3195 | * @buf - the string that holds the function filter text. |
| 3196 | * @len - the length of the string. |
| 3197 | * @reset - non zero to reset all filters before applying this filter. |
| 3198 | * |
| 3199 | * Filters denote which functions should be enabled when tracing is enabled. |
| 3200 | * If @buf is NULL and reset is set, all functions will be enabled for tracing. |
| 3201 | */ |
Jiri Olsa | ac483c4 | 2012-01-02 10:04:14 +0100 | [diff] [blame] | 3202 | int ftrace_set_filter(struct ftrace_ops *ops, unsigned char *buf, |
Steven Rostedt | 936e074 | 2011-05-05 22:54:01 -0400 | [diff] [blame] | 3203 | int len, int reset) |
Steven Rostedt | 77a2b37 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 3204 | { |
Jiri Olsa | ac483c4 | 2012-01-02 10:04:14 +0100 | [diff] [blame] | 3205 | return ftrace_set_regex(ops, buf, len, reset, 1); |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 3206 | } |
Steven Rostedt | 936e074 | 2011-05-05 22:54:01 -0400 | [diff] [blame] | 3207 | EXPORT_SYMBOL_GPL(ftrace_set_filter); |
Steven Rostedt | 4eebcc8 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 3208 | |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 3209 | /** |
| 3210 | * ftrace_set_notrace - set a function to not trace in ftrace |
Steven Rostedt | 936e074 | 2011-05-05 22:54:01 -0400 | [diff] [blame] | 3211 | * @ops - the ops to set the notrace filter with |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 3212 | * @buf - the string that holds the function notrace text. |
| 3213 | * @len - the length of the string. |
| 3214 | * @reset - non zero to reset all filters before applying this filter. |
| 3215 | * |
| 3216 | * Notrace Filters denote which functions should not be enabled when tracing |
| 3217 | * is enabled. If @buf is NULL and reset is set, all functions will be enabled |
| 3218 | * for tracing. |
| 3219 | */ |
Jiri Olsa | ac483c4 | 2012-01-02 10:04:14 +0100 | [diff] [blame] | 3220 | int ftrace_set_notrace(struct ftrace_ops *ops, unsigned char *buf, |
Steven Rostedt | 936e074 | 2011-05-05 22:54:01 -0400 | [diff] [blame] | 3221 | int len, int reset) |
| 3222 | { |
Jiri Olsa | ac483c4 | 2012-01-02 10:04:14 +0100 | [diff] [blame] | 3223 | return ftrace_set_regex(ops, buf, len, reset, 0); |
Steven Rostedt | 936e074 | 2011-05-05 22:54:01 -0400 | [diff] [blame] | 3224 | } |
| 3225 | EXPORT_SYMBOL_GPL(ftrace_set_notrace); |
| 3226 | /** |
| 3227 | * ftrace_set_filter - set a function to filter on in ftrace |
| 3228 | * @ops - the ops to set the filter with |
| 3229 | * @buf - the string that holds the function filter text. |
| 3230 | * @len - the length of the string. |
| 3231 | * @reset - non zero to reset all filters before applying this filter. |
| 3232 | * |
| 3233 | * Filters denote which functions should be enabled when tracing is enabled. |
| 3234 | * If @buf is NULL and reset is set, all functions will be enabled for tracing. |
| 3235 | */ |
| 3236 | void ftrace_set_global_filter(unsigned char *buf, int len, int reset) |
| 3237 | { |
| 3238 | ftrace_set_regex(&global_ops, buf, len, reset, 1); |
| 3239 | } |
| 3240 | EXPORT_SYMBOL_GPL(ftrace_set_global_filter); |
| 3241 | |
| 3242 | /** |
| 3243 | * ftrace_set_notrace - set a function to not trace in ftrace |
| 3244 | * @ops - the ops to set the notrace filter with |
| 3245 | * @buf - the string that holds the function notrace text. |
| 3246 | * @len - the length of the string. |
| 3247 | * @reset - non zero to reset all filters before applying this filter. |
| 3248 | * |
| 3249 | * Notrace Filters denote which functions should not be enabled when tracing |
| 3250 | * is enabled. If @buf is NULL and reset is set, all functions will be enabled |
| 3251 | * for tracing. |
| 3252 | */ |
| 3253 | void ftrace_set_global_notrace(unsigned char *buf, int len, int reset) |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 3254 | { |
Steven Rostedt | f45948e | 2011-05-02 12:29:25 -0400 | [diff] [blame] | 3255 | ftrace_set_regex(&global_ops, buf, len, reset, 0); |
Steven Rostedt | 77a2b37 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 3256 | } |
Steven Rostedt | 936e074 | 2011-05-05 22:54:01 -0400 | [diff] [blame] | 3257 | EXPORT_SYMBOL_GPL(ftrace_set_global_notrace); |
Steven Rostedt | 77a2b37 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 3258 | |
Steven Rostedt | 2af15d6 | 2009-05-28 13:37:24 -0400 | [diff] [blame] | 3259 | /* |
| 3260 | * command line interface to allow users to set filters on boot up. |
| 3261 | */ |
| 3262 | #define FTRACE_FILTER_SIZE COMMAND_LINE_SIZE |
| 3263 | static char ftrace_notrace_buf[FTRACE_FILTER_SIZE] __initdata; |
| 3264 | static char ftrace_filter_buf[FTRACE_FILTER_SIZE] __initdata; |
| 3265 | |
| 3266 | static int __init set_ftrace_notrace(char *str) |
| 3267 | { |
| 3268 | strncpy(ftrace_notrace_buf, str, FTRACE_FILTER_SIZE); |
| 3269 | return 1; |
| 3270 | } |
| 3271 | __setup("ftrace_notrace=", set_ftrace_notrace); |
| 3272 | |
| 3273 | static int __init set_ftrace_filter(char *str) |
| 3274 | { |
| 3275 | strncpy(ftrace_filter_buf, str, FTRACE_FILTER_SIZE); |
| 3276 | return 1; |
| 3277 | } |
| 3278 | __setup("ftrace_filter=", set_ftrace_filter); |
| 3279 | |
Stefan Assmann | 369bc18 | 2009-10-12 22:17:21 +0200 | [diff] [blame] | 3280 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
Lai Jiangshan | f6060f4 | 2009-11-05 11:16:17 +0800 | [diff] [blame] | 3281 | static char ftrace_graph_buf[FTRACE_FILTER_SIZE] __initdata; |
Steven Rostedt | 801c29f | 2010-03-05 20:02:19 -0500 | [diff] [blame] | 3282 | static int ftrace_set_func(unsigned long *array, int *idx, char *buffer); |
| 3283 | |
Stefan Assmann | 369bc18 | 2009-10-12 22:17:21 +0200 | [diff] [blame] | 3284 | static int __init set_graph_function(char *str) |
| 3285 | { |
Frederic Weisbecker | 06f43d6 | 2009-10-14 20:43:39 +0200 | [diff] [blame] | 3286 | strlcpy(ftrace_graph_buf, str, FTRACE_FILTER_SIZE); |
Stefan Assmann | 369bc18 | 2009-10-12 22:17:21 +0200 | [diff] [blame] | 3287 | return 1; |
| 3288 | } |
| 3289 | __setup("ftrace_graph_filter=", set_graph_function); |
| 3290 | |
| 3291 | static void __init set_ftrace_early_graph(char *buf) |
| 3292 | { |
| 3293 | int ret; |
| 3294 | char *func; |
| 3295 | |
| 3296 | while (buf) { |
| 3297 | func = strsep(&buf, ","); |
| 3298 | /* we allow only one expression at a time */ |
| 3299 | ret = ftrace_set_func(ftrace_graph_funcs, &ftrace_graph_count, |
| 3300 | func); |
| 3301 | if (ret) |
| 3302 | printk(KERN_DEBUG "ftrace: function %s not " |
| 3303 | "traceable\n", func); |
| 3304 | } |
| 3305 | } |
| 3306 | #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ |
| 3307 | |
Steven Rostedt | 2a85a37 | 2011-12-19 21:57:44 -0500 | [diff] [blame] | 3308 | void __init |
| 3309 | ftrace_set_early_filter(struct ftrace_ops *ops, char *buf, int enable) |
Steven Rostedt | 2af15d6 | 2009-05-28 13:37:24 -0400 | [diff] [blame] | 3310 | { |
| 3311 | char *func; |
| 3312 | |
| 3313 | while (buf) { |
| 3314 | func = strsep(&buf, ","); |
Steven Rostedt | f45948e | 2011-05-02 12:29:25 -0400 | [diff] [blame] | 3315 | ftrace_set_regex(ops, func, strlen(func), 0, enable); |
Steven Rostedt | 2af15d6 | 2009-05-28 13:37:24 -0400 | [diff] [blame] | 3316 | } |
| 3317 | } |
| 3318 | |
| 3319 | static void __init set_ftrace_early_filters(void) |
| 3320 | { |
| 3321 | if (ftrace_filter_buf[0]) |
Steven Rostedt | 2a85a37 | 2011-12-19 21:57:44 -0500 | [diff] [blame] | 3322 | ftrace_set_early_filter(&global_ops, ftrace_filter_buf, 1); |
Steven Rostedt | 2af15d6 | 2009-05-28 13:37:24 -0400 | [diff] [blame] | 3323 | if (ftrace_notrace_buf[0]) |
Steven Rostedt | 2a85a37 | 2011-12-19 21:57:44 -0500 | [diff] [blame] | 3324 | ftrace_set_early_filter(&global_ops, ftrace_notrace_buf, 0); |
Stefan Assmann | 369bc18 | 2009-10-12 22:17:21 +0200 | [diff] [blame] | 3325 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
| 3326 | if (ftrace_graph_buf[0]) |
| 3327 | set_ftrace_early_graph(ftrace_graph_buf); |
| 3328 | #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ |
Steven Rostedt | 2af15d6 | 2009-05-28 13:37:24 -0400 | [diff] [blame] | 3329 | } |
| 3330 | |
Steven Rostedt | fc13cb0 | 2011-12-19 14:41:25 -0500 | [diff] [blame] | 3331 | int ftrace_regex_release(struct inode *inode, struct file *file) |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3332 | { |
| 3333 | struct seq_file *m = (struct seq_file *)file->private_data; |
| 3334 | struct ftrace_iterator *iter; |
Steven Rostedt | 33dc9b1 | 2011-05-02 17:34:47 -0400 | [diff] [blame] | 3335 | struct ftrace_hash **orig_hash; |
jolsa@redhat.com | 689fd8b | 2009-09-11 17:29:29 +0200 | [diff] [blame] | 3336 | struct trace_parser *parser; |
Steven Rostedt | ed926f9 | 2011-05-03 13:25:24 -0400 | [diff] [blame] | 3337 | int filter_hash; |
Steven Rostedt | 33dc9b1 | 2011-05-02 17:34:47 -0400 | [diff] [blame] | 3338 | int ret; |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3339 | |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 3340 | mutex_lock(&ftrace_regex_lock); |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3341 | if (file->f_mode & FMODE_READ) { |
| 3342 | iter = m->private; |
| 3343 | |
| 3344 | seq_release(inode, file); |
| 3345 | } else |
| 3346 | iter = file->private_data; |
| 3347 | |
jolsa@redhat.com | 689fd8b | 2009-09-11 17:29:29 +0200 | [diff] [blame] | 3348 | parser = &iter->parser; |
| 3349 | if (trace_parser_loaded(parser)) { |
| 3350 | parser->buffer[parser->idx] = 0; |
Steven Rostedt | 1cf41dd7 | 2011-04-29 20:59:51 -0400 | [diff] [blame] | 3351 | ftrace_match_records(iter->hash, parser->buffer, parser->idx); |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3352 | } |
| 3353 | |
jolsa@redhat.com | 689fd8b | 2009-09-11 17:29:29 +0200 | [diff] [blame] | 3354 | trace_parser_put(parser); |
jolsa@redhat.com | 689fd8b | 2009-09-11 17:29:29 +0200 | [diff] [blame] | 3355 | |
Steven Rostedt | 058e297 | 2011-04-29 22:35:33 -0400 | [diff] [blame] | 3356 | if (file->f_mode & FMODE_WRITE) { |
Steven Rostedt | ed926f9 | 2011-05-03 13:25:24 -0400 | [diff] [blame] | 3357 | filter_hash = !!(iter->flags & FTRACE_ITER_FILTER); |
| 3358 | |
| 3359 | if (filter_hash) |
Steven Rostedt | 33dc9b1 | 2011-05-02 17:34:47 -0400 | [diff] [blame] | 3360 | orig_hash = &iter->ops->filter_hash; |
Steven Rostedt | ed926f9 | 2011-05-03 13:25:24 -0400 | [diff] [blame] | 3361 | else |
| 3362 | orig_hash = &iter->ops->notrace_hash; |
Steven Rostedt | 33dc9b1 | 2011-05-02 17:34:47 -0400 | [diff] [blame] | 3363 | |
Steven Rostedt | 058e297 | 2011-04-29 22:35:33 -0400 | [diff] [blame] | 3364 | mutex_lock(&ftrace_lock); |
Steven Rostedt | 41fb61c | 2011-07-13 15:03:44 -0400 | [diff] [blame] | 3365 | ret = ftrace_hash_move(iter->ops, filter_hash, |
| 3366 | orig_hash, iter->hash); |
| 3367 | if (!ret && (iter->ops->flags & FTRACE_OPS_FL_ENABLED) |
| 3368 | && ftrace_enabled) |
Jiri Olsa | 30fb6aa | 2011-12-05 18:22:48 +0100 | [diff] [blame] | 3369 | ftrace_run_update_code(FTRACE_UPDATE_CALLS); |
Steven Rostedt | 41fb61c | 2011-07-13 15:03:44 -0400 | [diff] [blame] | 3370 | |
Steven Rostedt | 058e297 | 2011-04-29 22:35:33 -0400 | [diff] [blame] | 3371 | mutex_unlock(&ftrace_lock); |
| 3372 | } |
Steven Rostedt | 33dc9b1 | 2011-05-02 17:34:47 -0400 | [diff] [blame] | 3373 | free_ftrace_hash(iter->hash); |
| 3374 | kfree(iter); |
Steven Rostedt | 058e297 | 2011-04-29 22:35:33 -0400 | [diff] [blame] | 3375 | |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 3376 | mutex_unlock(&ftrace_regex_lock); |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3377 | return 0; |
| 3378 | } |
| 3379 | |
Steven Rostedt | 5e2336a | 2009-03-05 21:44:55 -0500 | [diff] [blame] | 3380 | static const struct file_operations ftrace_avail_fops = { |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3381 | .open = ftrace_avail_open, |
| 3382 | .read = seq_read, |
| 3383 | .llseek = seq_lseek, |
Li Zefan | 3be04b4 | 2009-08-17 16:54:03 +0800 | [diff] [blame] | 3384 | .release = seq_release_private, |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3385 | }; |
| 3386 | |
Steven Rostedt | 647bcd0 | 2011-05-03 14:39:21 -0400 | [diff] [blame] | 3387 | static const struct file_operations ftrace_enabled_fops = { |
| 3388 | .open = ftrace_enabled_open, |
| 3389 | .read = seq_read, |
| 3390 | .llseek = seq_lseek, |
| 3391 | .release = seq_release_private, |
| 3392 | }; |
| 3393 | |
Steven Rostedt | 5e2336a | 2009-03-05 21:44:55 -0500 | [diff] [blame] | 3394 | static const struct file_operations ftrace_filter_fops = { |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3395 | .open = ftrace_filter_open, |
Lai Jiangshan | 850a80c | 2009-03-13 17:47:23 +0800 | [diff] [blame] | 3396 | .read = seq_read, |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3397 | .write = ftrace_filter_write, |
Steven Rostedt | 98c4fd0 | 2010-09-10 11:47:43 -0400 | [diff] [blame] | 3398 | .llseek = ftrace_regex_lseek, |
Steven Rostedt | 1cf41dd7 | 2011-04-29 20:59:51 -0400 | [diff] [blame] | 3399 | .release = ftrace_regex_release, |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3400 | }; |
| 3401 | |
Steven Rostedt | 5e2336a | 2009-03-05 21:44:55 -0500 | [diff] [blame] | 3402 | static const struct file_operations ftrace_notrace_fops = { |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 3403 | .open = ftrace_notrace_open, |
Lai Jiangshan | 850a80c | 2009-03-13 17:47:23 +0800 | [diff] [blame] | 3404 | .read = seq_read, |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 3405 | .write = ftrace_notrace_write, |
| 3406 | .llseek = ftrace_regex_lseek, |
Steven Rostedt | 1cf41dd7 | 2011-04-29 20:59:51 -0400 | [diff] [blame] | 3407 | .release = ftrace_regex_release, |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 3408 | }; |
| 3409 | |
Steven Rostedt | ea4e2bc | 2008-12-03 15:36:57 -0500 | [diff] [blame] | 3410 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
| 3411 | |
| 3412 | static DEFINE_MUTEX(graph_lock); |
| 3413 | |
| 3414 | int ftrace_graph_count; |
Li Zefan | c7c6b1f | 2010-02-10 15:43:04 +0800 | [diff] [blame] | 3415 | int ftrace_graph_filter_enabled; |
Steven Rostedt | ea4e2bc | 2008-12-03 15:36:57 -0500 | [diff] [blame] | 3416 | unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS] __read_mostly; |
| 3417 | |
| 3418 | static void * |
Li Zefan | 8595184 | 2009-06-24 09:54:00 +0800 | [diff] [blame] | 3419 | __g_next(struct seq_file *m, loff_t *pos) |
Steven Rostedt | ea4e2bc | 2008-12-03 15:36:57 -0500 | [diff] [blame] | 3420 | { |
Li Zefan | 8595184 | 2009-06-24 09:54:00 +0800 | [diff] [blame] | 3421 | if (*pos >= ftrace_graph_count) |
Steven Rostedt | ea4e2bc | 2008-12-03 15:36:57 -0500 | [diff] [blame] | 3422 | return NULL; |
Li Zefan | a4ec5e0 | 2009-09-18 14:06:28 +0800 | [diff] [blame] | 3423 | return &ftrace_graph_funcs[*pos]; |
Li Zefan | 8595184 | 2009-06-24 09:54:00 +0800 | [diff] [blame] | 3424 | } |
Steven Rostedt | ea4e2bc | 2008-12-03 15:36:57 -0500 | [diff] [blame] | 3425 | |
Li Zefan | 8595184 | 2009-06-24 09:54:00 +0800 | [diff] [blame] | 3426 | static void * |
| 3427 | g_next(struct seq_file *m, void *v, loff_t *pos) |
| 3428 | { |
| 3429 | (*pos)++; |
| 3430 | return __g_next(m, pos); |
Steven Rostedt | ea4e2bc | 2008-12-03 15:36:57 -0500 | [diff] [blame] | 3431 | } |
| 3432 | |
| 3433 | static void *g_start(struct seq_file *m, loff_t *pos) |
| 3434 | { |
Steven Rostedt | ea4e2bc | 2008-12-03 15:36:57 -0500 | [diff] [blame] | 3435 | mutex_lock(&graph_lock); |
| 3436 | |
Frederic Weisbecker | f9349a8 | 2009-02-19 21:13:12 +0100 | [diff] [blame] | 3437 | /* Nothing, tell g_show to print all functions are enabled */ |
Li Zefan | c7c6b1f | 2010-02-10 15:43:04 +0800 | [diff] [blame] | 3438 | if (!ftrace_graph_filter_enabled && !*pos) |
Frederic Weisbecker | f9349a8 | 2009-02-19 21:13:12 +0100 | [diff] [blame] | 3439 | return (void *)1; |
| 3440 | |
Li Zefan | 8595184 | 2009-06-24 09:54:00 +0800 | [diff] [blame] | 3441 | return __g_next(m, pos); |
Steven Rostedt | ea4e2bc | 2008-12-03 15:36:57 -0500 | [diff] [blame] | 3442 | } |
| 3443 | |
| 3444 | static void g_stop(struct seq_file *m, void *p) |
| 3445 | { |
| 3446 | mutex_unlock(&graph_lock); |
| 3447 | } |
| 3448 | |
| 3449 | static int g_show(struct seq_file *m, void *v) |
| 3450 | { |
| 3451 | unsigned long *ptr = v; |
Steven Rostedt | ea4e2bc | 2008-12-03 15:36:57 -0500 | [diff] [blame] | 3452 | |
| 3453 | if (!ptr) |
| 3454 | return 0; |
| 3455 | |
Frederic Weisbecker | f9349a8 | 2009-02-19 21:13:12 +0100 | [diff] [blame] | 3456 | if (ptr == (unsigned long *)1) { |
| 3457 | seq_printf(m, "#### all functions enabled ####\n"); |
| 3458 | return 0; |
| 3459 | } |
| 3460 | |
Steven Rostedt | b375a11 | 2009-09-17 00:05:58 -0400 | [diff] [blame] | 3461 | seq_printf(m, "%ps\n", (void *)*ptr); |
Steven Rostedt | ea4e2bc | 2008-12-03 15:36:57 -0500 | [diff] [blame] | 3462 | |
| 3463 | return 0; |
| 3464 | } |
| 3465 | |
James Morris | 88e9d34 | 2009-09-22 16:43:43 -0700 | [diff] [blame] | 3466 | static const struct seq_operations ftrace_graph_seq_ops = { |
Steven Rostedt | ea4e2bc | 2008-12-03 15:36:57 -0500 | [diff] [blame] | 3467 | .start = g_start, |
| 3468 | .next = g_next, |
| 3469 | .stop = g_stop, |
| 3470 | .show = g_show, |
| 3471 | }; |
| 3472 | |
| 3473 | static int |
| 3474 | ftrace_graph_open(struct inode *inode, struct file *file) |
| 3475 | { |
| 3476 | int ret = 0; |
| 3477 | |
| 3478 | if (unlikely(ftrace_disabled)) |
| 3479 | return -ENODEV; |
| 3480 | |
| 3481 | mutex_lock(&graph_lock); |
| 3482 | if ((file->f_mode & FMODE_WRITE) && |
Steven Rostedt | 8650ae3 | 2009-07-22 23:29:30 -0400 | [diff] [blame] | 3483 | (file->f_flags & O_TRUNC)) { |
Li Zefan | c7c6b1f | 2010-02-10 15:43:04 +0800 | [diff] [blame] | 3484 | ftrace_graph_filter_enabled = 0; |
Steven Rostedt | ea4e2bc | 2008-12-03 15:36:57 -0500 | [diff] [blame] | 3485 | ftrace_graph_count = 0; |
| 3486 | memset(ftrace_graph_funcs, 0, sizeof(ftrace_graph_funcs)); |
| 3487 | } |
Steven Rostedt | ea4e2bc | 2008-12-03 15:36:57 -0500 | [diff] [blame] | 3488 | mutex_unlock(&graph_lock); |
| 3489 | |
Li Zefan | a4ec5e0 | 2009-09-18 14:06:28 +0800 | [diff] [blame] | 3490 | if (file->f_mode & FMODE_READ) |
| 3491 | ret = seq_open(file, &ftrace_graph_seq_ops); |
| 3492 | |
Steven Rostedt | ea4e2bc | 2008-12-03 15:36:57 -0500 | [diff] [blame] | 3493 | return ret; |
| 3494 | } |
| 3495 | |
Steven Rostedt | ea4e2bc | 2008-12-03 15:36:57 -0500 | [diff] [blame] | 3496 | static int |
Li Zefan | 8782711 | 2009-07-23 11:29:11 +0800 | [diff] [blame] | 3497 | ftrace_graph_release(struct inode *inode, struct file *file) |
| 3498 | { |
| 3499 | if (file->f_mode & FMODE_READ) |
| 3500 | seq_release(inode, file); |
| 3501 | return 0; |
| 3502 | } |
| 3503 | |
| 3504 | static int |
Frederic Weisbecker | f9349a8 | 2009-02-19 21:13:12 +0100 | [diff] [blame] | 3505 | ftrace_set_func(unsigned long *array, int *idx, char *buffer) |
Steven Rostedt | ea4e2bc | 2008-12-03 15:36:57 -0500 | [diff] [blame] | 3506 | { |
Steven Rostedt | ea4e2bc | 2008-12-03 15:36:57 -0500 | [diff] [blame] | 3507 | struct dyn_ftrace *rec; |
| 3508 | struct ftrace_page *pg; |
Frederic Weisbecker | f9349a8 | 2009-02-19 21:13:12 +0100 | [diff] [blame] | 3509 | int search_len; |
Li Zefan | c7c6b1f | 2010-02-10 15:43:04 +0800 | [diff] [blame] | 3510 | int fail = 1; |
Frederic Weisbecker | f9349a8 | 2009-02-19 21:13:12 +0100 | [diff] [blame] | 3511 | int type, not; |
| 3512 | char *search; |
| 3513 | bool exists; |
| 3514 | int i; |
Steven Rostedt | ea4e2bc | 2008-12-03 15:36:57 -0500 | [diff] [blame] | 3515 | |
Frederic Weisbecker | f9349a8 | 2009-02-19 21:13:12 +0100 | [diff] [blame] | 3516 | /* decode regex */ |
Frederic Weisbecker | 3f6fe06 | 2009-09-24 21:31:51 +0200 | [diff] [blame] | 3517 | type = filter_parse_regex(buffer, strlen(buffer), &search, ¬); |
Li Zefan | c7c6b1f | 2010-02-10 15:43:04 +0800 | [diff] [blame] | 3518 | if (!not && *idx >= FTRACE_GRAPH_MAX_FUNCS) |
| 3519 | return -EBUSY; |
Frederic Weisbecker | f9349a8 | 2009-02-19 21:13:12 +0100 | [diff] [blame] | 3520 | |
| 3521 | search_len = strlen(search); |
| 3522 | |
Steven Rostedt | 52baf11 | 2009-02-14 01:15:39 -0500 | [diff] [blame] | 3523 | mutex_lock(&ftrace_lock); |
Steven Rostedt | 45a4a23 | 2011-04-21 23:16:46 -0400 | [diff] [blame] | 3524 | |
| 3525 | if (unlikely(ftrace_disabled)) { |
| 3526 | mutex_unlock(&ftrace_lock); |
| 3527 | return -ENODEV; |
| 3528 | } |
| 3529 | |
Steven Rostedt | 265c831 | 2009-02-13 12:43:56 -0500 | [diff] [blame] | 3530 | do_for_each_ftrace_rec(pg, rec) { |
Steven Rostedt | ea4e2bc | 2008-12-03 15:36:57 -0500 | [diff] [blame] | 3531 | |
Steven Rostedt | b9df92d | 2011-04-28 20:32:08 -0400 | [diff] [blame] | 3532 | if (ftrace_match_record(rec, NULL, search, search_len, type)) { |
Li Zefan | c7c6b1f | 2010-02-10 15:43:04 +0800 | [diff] [blame] | 3533 | /* if it is in the array */ |
Frederic Weisbecker | f9349a8 | 2009-02-19 21:13:12 +0100 | [diff] [blame] | 3534 | exists = false; |
Li Zefan | c7c6b1f | 2010-02-10 15:43:04 +0800 | [diff] [blame] | 3535 | for (i = 0; i < *idx; i++) { |
Frederic Weisbecker | f9349a8 | 2009-02-19 21:13:12 +0100 | [diff] [blame] | 3536 | if (array[i] == rec->ip) { |
| 3537 | exists = true; |
Steven Rostedt | 265c831 | 2009-02-13 12:43:56 -0500 | [diff] [blame] | 3538 | break; |
| 3539 | } |
Li Zefan | c7c6b1f | 2010-02-10 15:43:04 +0800 | [diff] [blame] | 3540 | } |
| 3541 | |
| 3542 | if (!not) { |
| 3543 | fail = 0; |
| 3544 | if (!exists) { |
| 3545 | array[(*idx)++] = rec->ip; |
| 3546 | if (*idx >= FTRACE_GRAPH_MAX_FUNCS) |
| 3547 | goto out; |
| 3548 | } |
| 3549 | } else { |
| 3550 | if (exists) { |
| 3551 | array[i] = array[--(*idx)]; |
| 3552 | array[*idx] = 0; |
| 3553 | fail = 0; |
| 3554 | } |
| 3555 | } |
Steven Rostedt | ea4e2bc | 2008-12-03 15:36:57 -0500 | [diff] [blame] | 3556 | } |
Steven Rostedt | 265c831 | 2009-02-13 12:43:56 -0500 | [diff] [blame] | 3557 | } while_for_each_ftrace_rec(); |
Li Zefan | c7c6b1f | 2010-02-10 15:43:04 +0800 | [diff] [blame] | 3558 | out: |
Steven Rostedt | 52baf11 | 2009-02-14 01:15:39 -0500 | [diff] [blame] | 3559 | mutex_unlock(&ftrace_lock); |
Steven Rostedt | ea4e2bc | 2008-12-03 15:36:57 -0500 | [diff] [blame] | 3560 | |
Li Zefan | c7c6b1f | 2010-02-10 15:43:04 +0800 | [diff] [blame] | 3561 | if (fail) |
| 3562 | return -EINVAL; |
| 3563 | |
| 3564 | ftrace_graph_filter_enabled = 1; |
| 3565 | return 0; |
Steven Rostedt | ea4e2bc | 2008-12-03 15:36:57 -0500 | [diff] [blame] | 3566 | } |
| 3567 | |
| 3568 | static ssize_t |
| 3569 | ftrace_graph_write(struct file *file, const char __user *ubuf, |
| 3570 | size_t cnt, loff_t *ppos) |
| 3571 | { |
jolsa@redhat.com | 689fd8b | 2009-09-11 17:29:29 +0200 | [diff] [blame] | 3572 | struct trace_parser parser; |
Li Zefan | 4ba7978 | 2009-09-22 13:52:20 +0800 | [diff] [blame] | 3573 | ssize_t read, ret; |
Steven Rostedt | ea4e2bc | 2008-12-03 15:36:57 -0500 | [diff] [blame] | 3574 | |
Li Zefan | c7c6b1f | 2010-02-10 15:43:04 +0800 | [diff] [blame] | 3575 | if (!cnt) |
Steven Rostedt | ea4e2bc | 2008-12-03 15:36:57 -0500 | [diff] [blame] | 3576 | return 0; |
| 3577 | |
| 3578 | mutex_lock(&graph_lock); |
| 3579 | |
jolsa@redhat.com | 689fd8b | 2009-09-11 17:29:29 +0200 | [diff] [blame] | 3580 | if (trace_parser_get_init(&parser, FTRACE_BUFF_MAX)) { |
| 3581 | ret = -ENOMEM; |
Li Zefan | 1eb90f1 | 2009-09-22 13:52:57 +0800 | [diff] [blame] | 3582 | goto out_unlock; |
jolsa@redhat.com | 689fd8b | 2009-09-11 17:29:29 +0200 | [diff] [blame] | 3583 | } |
Steven Rostedt | ea4e2bc | 2008-12-03 15:36:57 -0500 | [diff] [blame] | 3584 | |
jolsa@redhat.com | 689fd8b | 2009-09-11 17:29:29 +0200 | [diff] [blame] | 3585 | read = trace_get_user(&parser, ubuf, cnt, ppos); |
| 3586 | |
Li Zefan | 4ba7978 | 2009-09-22 13:52:20 +0800 | [diff] [blame] | 3587 | if (read >= 0 && trace_parser_loaded((&parser))) { |
jolsa@redhat.com | 689fd8b | 2009-09-11 17:29:29 +0200 | [diff] [blame] | 3588 | parser.buffer[parser.idx] = 0; |
| 3589 | |
| 3590 | /* we allow only one expression at a time */ |
Li Zefan | a4ec5e0 | 2009-09-18 14:06:28 +0800 | [diff] [blame] | 3591 | ret = ftrace_set_func(ftrace_graph_funcs, &ftrace_graph_count, |
jolsa@redhat.com | 689fd8b | 2009-09-11 17:29:29 +0200 | [diff] [blame] | 3592 | parser.buffer); |
Steven Rostedt | ea4e2bc | 2008-12-03 15:36:57 -0500 | [diff] [blame] | 3593 | if (ret) |
Li Zefan | 1eb90f1 | 2009-09-22 13:52:57 +0800 | [diff] [blame] | 3594 | goto out_free; |
Steven Rostedt | ea4e2bc | 2008-12-03 15:36:57 -0500 | [diff] [blame] | 3595 | } |
| 3596 | |
Steven Rostedt | ea4e2bc | 2008-12-03 15:36:57 -0500 | [diff] [blame] | 3597 | ret = read; |
Li Zefan | 1eb90f1 | 2009-09-22 13:52:57 +0800 | [diff] [blame] | 3598 | |
| 3599 | out_free: |
jolsa@redhat.com | 689fd8b | 2009-09-11 17:29:29 +0200 | [diff] [blame] | 3600 | trace_parser_put(&parser); |
Li Zefan | 1eb90f1 | 2009-09-22 13:52:57 +0800 | [diff] [blame] | 3601 | out_unlock: |
Steven Rostedt | ea4e2bc | 2008-12-03 15:36:57 -0500 | [diff] [blame] | 3602 | mutex_unlock(&graph_lock); |
| 3603 | |
| 3604 | return ret; |
| 3605 | } |
| 3606 | |
| 3607 | static const struct file_operations ftrace_graph_fops = { |
Li Zefan | 8782711 | 2009-07-23 11:29:11 +0800 | [diff] [blame] | 3608 | .open = ftrace_graph_open, |
| 3609 | .read = seq_read, |
| 3610 | .write = ftrace_graph_write, |
| 3611 | .release = ftrace_graph_release, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 3612 | .llseek = seq_lseek, |
Steven Rostedt | ea4e2bc | 2008-12-03 15:36:57 -0500 | [diff] [blame] | 3613 | }; |
| 3614 | #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ |
| 3615 | |
Steven Rostedt | df4fc31 | 2008-11-26 00:16:23 -0500 | [diff] [blame] | 3616 | static __init int ftrace_init_dyn_debugfs(struct dentry *d_tracer) |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3617 | { |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3618 | |
Frederic Weisbecker | 5452af6 | 2009-03-27 00:25:38 +0100 | [diff] [blame] | 3619 | trace_create_file("available_filter_functions", 0444, |
| 3620 | d_tracer, NULL, &ftrace_avail_fops); |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3621 | |
Steven Rostedt | 647bcd0 | 2011-05-03 14:39:21 -0400 | [diff] [blame] | 3622 | trace_create_file("enabled_functions", 0444, |
| 3623 | d_tracer, NULL, &ftrace_enabled_fops); |
| 3624 | |
Frederic Weisbecker | 5452af6 | 2009-03-27 00:25:38 +0100 | [diff] [blame] | 3625 | trace_create_file("set_ftrace_filter", 0644, d_tracer, |
| 3626 | NULL, &ftrace_filter_fops); |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 3627 | |
Frederic Weisbecker | 5452af6 | 2009-03-27 00:25:38 +0100 | [diff] [blame] | 3628 | trace_create_file("set_ftrace_notrace", 0644, d_tracer, |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 3629 | NULL, &ftrace_notrace_fops); |
Steven Rostedt | ad90c0e | 2008-05-27 20:48:37 -0400 | [diff] [blame] | 3630 | |
Steven Rostedt | ea4e2bc | 2008-12-03 15:36:57 -0500 | [diff] [blame] | 3631 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
Frederic Weisbecker | 5452af6 | 2009-03-27 00:25:38 +0100 | [diff] [blame] | 3632 | trace_create_file("set_graph_function", 0444, d_tracer, |
Steven Rostedt | ea4e2bc | 2008-12-03 15:36:57 -0500 | [diff] [blame] | 3633 | NULL, |
| 3634 | &ftrace_graph_fops); |
Steven Rostedt | ea4e2bc | 2008-12-03 15:36:57 -0500 | [diff] [blame] | 3635 | #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ |
| 3636 | |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3637 | return 0; |
| 3638 | } |
| 3639 | |
Steven Rostedt | 9fd4932 | 2012-04-24 22:32:06 -0400 | [diff] [blame] | 3640 | static int ftrace_cmp_ips(const void *a, const void *b) |
Steven Rostedt | 6895061 | 2011-12-16 17:06:45 -0500 | [diff] [blame] | 3641 | { |
Steven Rostedt | 9fd4932 | 2012-04-24 22:32:06 -0400 | [diff] [blame] | 3642 | const unsigned long *ipa = a; |
| 3643 | const unsigned long *ipb = b; |
Steven Rostedt | 6895061 | 2011-12-16 17:06:45 -0500 | [diff] [blame] | 3644 | |
Steven Rostedt | 9fd4932 | 2012-04-24 22:32:06 -0400 | [diff] [blame] | 3645 | if (*ipa > *ipb) |
| 3646 | return 1; |
| 3647 | if (*ipa < *ipb) |
| 3648 | return -1; |
| 3649 | return 0; |
| 3650 | } |
| 3651 | |
| 3652 | static void ftrace_swap_ips(void *a, void *b, int size) |
| 3653 | { |
| 3654 | unsigned long *ipa = a; |
| 3655 | unsigned long *ipb = b; |
| 3656 | unsigned long t; |
| 3657 | |
| 3658 | t = *ipa; |
| 3659 | *ipa = *ipb; |
| 3660 | *ipb = t; |
Steven Rostedt | 6895061 | 2011-12-16 17:06:45 -0500 | [diff] [blame] | 3661 | } |
| 3662 | |
Jiri Olsa | 5cb084b | 2009-10-13 16:33:53 -0400 | [diff] [blame] | 3663 | static int ftrace_process_locs(struct module *mod, |
Steven Rostedt | 31e8890 | 2008-11-14 16:21:19 -0800 | [diff] [blame] | 3664 | unsigned long *start, |
Steven Rostedt | 68bf21a | 2008-08-14 15:45:08 -0400 | [diff] [blame] | 3665 | unsigned long *end) |
| 3666 | { |
Steven Rostedt | 706c81f | 2012-04-24 23:45:26 -0400 | [diff] [blame^] | 3667 | struct ftrace_page *start_pg; |
Steven Rostedt | a790087 | 2011-12-16 16:23:44 -0500 | [diff] [blame] | 3668 | struct ftrace_page *pg; |
Steven Rostedt | 706c81f | 2012-04-24 23:45:26 -0400 | [diff] [blame^] | 3669 | struct dyn_ftrace *rec; |
Steven Rostedt | a790087 | 2011-12-16 16:23:44 -0500 | [diff] [blame] | 3670 | unsigned long count; |
Steven Rostedt | 68bf21a | 2008-08-14 15:45:08 -0400 | [diff] [blame] | 3671 | unsigned long *p; |
| 3672 | unsigned long addr; |
Steven Rostedt | 4376cac | 2011-06-24 23:28:13 -0400 | [diff] [blame] | 3673 | unsigned long flags = 0; /* Shut up gcc */ |
Steven Rostedt | a790087 | 2011-12-16 16:23:44 -0500 | [diff] [blame] | 3674 | int ret = -ENOMEM; |
| 3675 | |
| 3676 | count = end - start; |
| 3677 | |
| 3678 | if (!count) |
| 3679 | return 0; |
| 3680 | |
Steven Rostedt | 9fd4932 | 2012-04-24 22:32:06 -0400 | [diff] [blame] | 3681 | sort(start, count, sizeof(*start), |
| 3682 | ftrace_cmp_ips, ftrace_swap_ips); |
| 3683 | |
Steven Rostedt | 706c81f | 2012-04-24 23:45:26 -0400 | [diff] [blame^] | 3684 | start_pg = ftrace_allocate_pages(count); |
| 3685 | if (!start_pg) |
Steven Rostedt | a790087 | 2011-12-16 16:23:44 -0500 | [diff] [blame] | 3686 | return -ENOMEM; |
Steven Rostedt | 68bf21a | 2008-08-14 15:45:08 -0400 | [diff] [blame] | 3687 | |
Steven Rostedt | e6ea44e | 2009-02-14 01:42:44 -0500 | [diff] [blame] | 3688 | mutex_lock(&ftrace_lock); |
Steven Rostedt | a790087 | 2011-12-16 16:23:44 -0500 | [diff] [blame] | 3689 | |
Steven Rostedt | 3208230 | 2011-12-16 14:42:37 -0500 | [diff] [blame] | 3690 | /* |
| 3691 | * Core and each module needs their own pages, as |
| 3692 | * modules will free them when they are removed. |
| 3693 | * Force a new page to be allocated for modules. |
| 3694 | */ |
Steven Rostedt | a790087 | 2011-12-16 16:23:44 -0500 | [diff] [blame] | 3695 | if (!mod) { |
| 3696 | WARN_ON(ftrace_pages || ftrace_pages_start); |
| 3697 | /* First initialization */ |
Steven Rostedt | 706c81f | 2012-04-24 23:45:26 -0400 | [diff] [blame^] | 3698 | ftrace_pages = ftrace_pages_start = start_pg; |
Steven Rostedt | a790087 | 2011-12-16 16:23:44 -0500 | [diff] [blame] | 3699 | } else { |
Steven Rostedt | 3208230 | 2011-12-16 14:42:37 -0500 | [diff] [blame] | 3700 | if (!ftrace_pages) |
Steven Rostedt | a790087 | 2011-12-16 16:23:44 -0500 | [diff] [blame] | 3701 | goto out; |
Steven Rostedt | 3208230 | 2011-12-16 14:42:37 -0500 | [diff] [blame] | 3702 | |
Steven Rostedt | a790087 | 2011-12-16 16:23:44 -0500 | [diff] [blame] | 3703 | if (WARN_ON(ftrace_pages->next)) { |
| 3704 | /* Hmm, we have free pages? */ |
| 3705 | while (ftrace_pages->next) |
| 3706 | ftrace_pages = ftrace_pages->next; |
Steven Rostedt | 3208230 | 2011-12-16 14:42:37 -0500 | [diff] [blame] | 3707 | } |
Steven Rostedt | a790087 | 2011-12-16 16:23:44 -0500 | [diff] [blame] | 3708 | |
Steven Rostedt | 706c81f | 2012-04-24 23:45:26 -0400 | [diff] [blame^] | 3709 | ftrace_pages->next = start_pg; |
Steven Rostedt | 3208230 | 2011-12-16 14:42:37 -0500 | [diff] [blame] | 3710 | } |
| 3711 | |
Steven Rostedt | 68bf21a | 2008-08-14 15:45:08 -0400 | [diff] [blame] | 3712 | p = start; |
Steven Rostedt | 706c81f | 2012-04-24 23:45:26 -0400 | [diff] [blame^] | 3713 | pg = start_pg; |
Steven Rostedt | 68bf21a | 2008-08-14 15:45:08 -0400 | [diff] [blame] | 3714 | while (p < end) { |
| 3715 | addr = ftrace_call_adjust(*p++); |
Steven Rostedt | 20e5227 | 2008-11-14 16:21:19 -0800 | [diff] [blame] | 3716 | /* |
| 3717 | * Some architecture linkers will pad between |
| 3718 | * the different mcount_loc sections of different |
| 3719 | * object files to satisfy alignments. |
| 3720 | * Skip any NULL pointers. |
| 3721 | */ |
| 3722 | if (!addr) |
| 3723 | continue; |
Steven Rostedt | 706c81f | 2012-04-24 23:45:26 -0400 | [diff] [blame^] | 3724 | |
| 3725 | if (pg->index == pg->size) { |
| 3726 | /* We should have allocated enough */ |
| 3727 | if (WARN_ON(!pg->next)) |
| 3728 | break; |
| 3729 | pg = pg->next; |
| 3730 | } |
| 3731 | |
| 3732 | rec = &pg->records[pg->index++]; |
| 3733 | rec->ip = addr; |
Steven Rostedt | 68bf21a | 2008-08-14 15:45:08 -0400 | [diff] [blame] | 3734 | } |
| 3735 | |
Steven Rostedt | 706c81f | 2012-04-24 23:45:26 -0400 | [diff] [blame^] | 3736 | /* We should have used all pages */ |
| 3737 | WARN_ON(pg->next); |
| 3738 | |
| 3739 | /* Assign the last page to ftrace_pages */ |
| 3740 | ftrace_pages = pg; |
| 3741 | |
Steven Rostedt | 85ae32a | 2011-12-16 16:30:31 -0500 | [diff] [blame] | 3742 | /* These new locations need to be initialized */ |
Steven Rostedt | 706c81f | 2012-04-24 23:45:26 -0400 | [diff] [blame^] | 3743 | ftrace_new_pgs = start_pg; |
Steven Rostedt | 85ae32a | 2011-12-16 16:30:31 -0500 | [diff] [blame] | 3744 | |
Steven Rostedt | a4f18ed | 2011-06-07 09:26:46 -0400 | [diff] [blame] | 3745 | /* |
Steven Rostedt | 4376cac | 2011-06-24 23:28:13 -0400 | [diff] [blame] | 3746 | * We only need to disable interrupts on start up |
| 3747 | * because we are modifying code that an interrupt |
| 3748 | * may execute, and the modification is not atomic. |
| 3749 | * But for modules, nothing runs the code we modify |
| 3750 | * until we are finished with it, and there's no |
| 3751 | * reason to cause large interrupt latencies while we do it. |
Steven Rostedt | a4f18ed | 2011-06-07 09:26:46 -0400 | [diff] [blame] | 3752 | */ |
Steven Rostedt | 4376cac | 2011-06-24 23:28:13 -0400 | [diff] [blame] | 3753 | if (!mod) |
| 3754 | local_irq_save(flags); |
Steven Rostedt | 31e8890 | 2008-11-14 16:21:19 -0800 | [diff] [blame] | 3755 | ftrace_update_code(mod); |
Steven Rostedt | 4376cac | 2011-06-24 23:28:13 -0400 | [diff] [blame] | 3756 | if (!mod) |
| 3757 | local_irq_restore(flags); |
Steven Rostedt | a790087 | 2011-12-16 16:23:44 -0500 | [diff] [blame] | 3758 | ret = 0; |
| 3759 | out: |
Steven Rostedt | e6ea44e | 2009-02-14 01:42:44 -0500 | [diff] [blame] | 3760 | mutex_unlock(&ftrace_lock); |
Steven Rostedt | 68bf21a | 2008-08-14 15:45:08 -0400 | [diff] [blame] | 3761 | |
Steven Rostedt | a790087 | 2011-12-16 16:23:44 -0500 | [diff] [blame] | 3762 | return ret; |
Steven Rostedt | 68bf21a | 2008-08-14 15:45:08 -0400 | [diff] [blame] | 3763 | } |
| 3764 | |
Steven Rostedt | 93eb677 | 2009-04-15 13:24:06 -0400 | [diff] [blame] | 3765 | #ifdef CONFIG_MODULES |
Steven Rostedt | 3208230 | 2011-12-16 14:42:37 -0500 | [diff] [blame] | 3766 | |
| 3767 | #define next_to_ftrace_page(p) container_of(p, struct ftrace_page, next) |
| 3768 | |
jolsa@redhat.com | e7247a1 | 2009-10-07 19:00:35 +0200 | [diff] [blame] | 3769 | void ftrace_release_mod(struct module *mod) |
Steven Rostedt | 93eb677 | 2009-04-15 13:24:06 -0400 | [diff] [blame] | 3770 | { |
| 3771 | struct dyn_ftrace *rec; |
Steven Rostedt | 3208230 | 2011-12-16 14:42:37 -0500 | [diff] [blame] | 3772 | struct ftrace_page **last_pg; |
Steven Rostedt | 93eb677 | 2009-04-15 13:24:06 -0400 | [diff] [blame] | 3773 | struct ftrace_page *pg; |
Steven Rostedt | a790087 | 2011-12-16 16:23:44 -0500 | [diff] [blame] | 3774 | int order; |
Steven Rostedt | 93eb677 | 2009-04-15 13:24:06 -0400 | [diff] [blame] | 3775 | |
Steven Rostedt | 93eb677 | 2009-04-15 13:24:06 -0400 | [diff] [blame] | 3776 | mutex_lock(&ftrace_lock); |
Steven Rostedt | 45a4a23 | 2011-04-21 23:16:46 -0400 | [diff] [blame] | 3777 | |
| 3778 | if (ftrace_disabled) |
| 3779 | goto out_unlock; |
| 3780 | |
Steven Rostedt | 3208230 | 2011-12-16 14:42:37 -0500 | [diff] [blame] | 3781 | /* |
| 3782 | * Each module has its own ftrace_pages, remove |
| 3783 | * them from the list. |
| 3784 | */ |
| 3785 | last_pg = &ftrace_pages_start; |
| 3786 | for (pg = ftrace_pages_start; pg; pg = *last_pg) { |
| 3787 | rec = &pg->records[0]; |
jolsa@redhat.com | e7247a1 | 2009-10-07 19:00:35 +0200 | [diff] [blame] | 3788 | if (within_module_core(rec->ip, mod)) { |
Steven Rostedt | 93eb677 | 2009-04-15 13:24:06 -0400 | [diff] [blame] | 3789 | /* |
Steven Rostedt | 3208230 | 2011-12-16 14:42:37 -0500 | [diff] [blame] | 3790 | * As core pages are first, the first |
| 3791 | * page should never be a module page. |
Steven Rostedt | 93eb677 | 2009-04-15 13:24:06 -0400 | [diff] [blame] | 3792 | */ |
Steven Rostedt | 3208230 | 2011-12-16 14:42:37 -0500 | [diff] [blame] | 3793 | if (WARN_ON(pg == ftrace_pages_start)) |
| 3794 | goto out_unlock; |
| 3795 | |
| 3796 | /* Check if we are deleting the last page */ |
| 3797 | if (pg == ftrace_pages) |
| 3798 | ftrace_pages = next_to_ftrace_page(last_pg); |
| 3799 | |
| 3800 | *last_pg = pg->next; |
Steven Rostedt | a790087 | 2011-12-16 16:23:44 -0500 | [diff] [blame] | 3801 | order = get_count_order(pg->size / ENTRIES_PER_PAGE); |
| 3802 | free_pages((unsigned long)pg->records, order); |
| 3803 | kfree(pg); |
Steven Rostedt | 3208230 | 2011-12-16 14:42:37 -0500 | [diff] [blame] | 3804 | } else |
| 3805 | last_pg = &pg->next; |
| 3806 | } |
Steven Rostedt | 45a4a23 | 2011-04-21 23:16:46 -0400 | [diff] [blame] | 3807 | out_unlock: |
Steven Rostedt | 93eb677 | 2009-04-15 13:24:06 -0400 | [diff] [blame] | 3808 | mutex_unlock(&ftrace_lock); |
| 3809 | } |
| 3810 | |
| 3811 | static void ftrace_init_module(struct module *mod, |
| 3812 | unsigned long *start, unsigned long *end) |
Steven Rostedt | 90d595f | 2008-08-14 15:45:09 -0400 | [diff] [blame] | 3813 | { |
Steven Rostedt | 00fd61a | 2008-08-15 21:40:04 -0400 | [diff] [blame] | 3814 | if (ftrace_disabled || start == end) |
Steven Rostedt | fed1939 | 2008-08-14 22:47:19 -0400 | [diff] [blame] | 3815 | return; |
Jiri Olsa | 5cb084b | 2009-10-13 16:33:53 -0400 | [diff] [blame] | 3816 | ftrace_process_locs(mod, start, end); |
Steven Rostedt | 90d595f | 2008-08-14 15:45:09 -0400 | [diff] [blame] | 3817 | } |
| 3818 | |
Steven Rostedt | 93eb677 | 2009-04-15 13:24:06 -0400 | [diff] [blame] | 3819 | static int ftrace_module_notify(struct notifier_block *self, |
| 3820 | unsigned long val, void *data) |
| 3821 | { |
| 3822 | struct module *mod = data; |
| 3823 | |
| 3824 | switch (val) { |
| 3825 | case MODULE_STATE_COMING: |
| 3826 | ftrace_init_module(mod, mod->ftrace_callsites, |
| 3827 | mod->ftrace_callsites + |
| 3828 | mod->num_ftrace_callsites); |
| 3829 | break; |
| 3830 | case MODULE_STATE_GOING: |
jolsa@redhat.com | e7247a1 | 2009-10-07 19:00:35 +0200 | [diff] [blame] | 3831 | ftrace_release_mod(mod); |
Steven Rostedt | 93eb677 | 2009-04-15 13:24:06 -0400 | [diff] [blame] | 3832 | break; |
| 3833 | } |
| 3834 | |
| 3835 | return 0; |
| 3836 | } |
| 3837 | #else |
| 3838 | static int ftrace_module_notify(struct notifier_block *self, |
| 3839 | unsigned long val, void *data) |
| 3840 | { |
| 3841 | return 0; |
| 3842 | } |
| 3843 | #endif /* CONFIG_MODULES */ |
| 3844 | |
| 3845 | struct notifier_block ftrace_module_nb = { |
| 3846 | .notifier_call = ftrace_module_notify, |
| 3847 | .priority = 0, |
| 3848 | }; |
| 3849 | |
Steven Rostedt | 68bf21a | 2008-08-14 15:45:08 -0400 | [diff] [blame] | 3850 | extern unsigned long __start_mcount_loc[]; |
| 3851 | extern unsigned long __stop_mcount_loc[]; |
| 3852 | |
| 3853 | void __init ftrace_init(void) |
| 3854 | { |
| 3855 | unsigned long count, addr, flags; |
| 3856 | int ret; |
| 3857 | |
| 3858 | /* Keep the ftrace pointer to the stub */ |
| 3859 | addr = (unsigned long)ftrace_stub; |
| 3860 | |
| 3861 | local_irq_save(flags); |
| 3862 | ftrace_dyn_arch_init(&addr); |
| 3863 | local_irq_restore(flags); |
| 3864 | |
| 3865 | /* ftrace_dyn_arch_init places the return code in addr */ |
| 3866 | if (addr) |
| 3867 | goto failed; |
| 3868 | |
| 3869 | count = __stop_mcount_loc - __start_mcount_loc; |
| 3870 | |
| 3871 | ret = ftrace_dyn_table_alloc(count); |
| 3872 | if (ret) |
| 3873 | goto failed; |
| 3874 | |
| 3875 | last_ftrace_enabled = ftrace_enabled = 1; |
| 3876 | |
Jiri Olsa | 5cb084b | 2009-10-13 16:33:53 -0400 | [diff] [blame] | 3877 | ret = ftrace_process_locs(NULL, |
Steven Rostedt | 31e8890 | 2008-11-14 16:21:19 -0800 | [diff] [blame] | 3878 | __start_mcount_loc, |
Steven Rostedt | 68bf21a | 2008-08-14 15:45:08 -0400 | [diff] [blame] | 3879 | __stop_mcount_loc); |
| 3880 | |
Steven Rostedt | 93eb677 | 2009-04-15 13:24:06 -0400 | [diff] [blame] | 3881 | ret = register_module_notifier(&ftrace_module_nb); |
Ming Lei | 24ed0c4 | 2009-05-17 15:31:38 +0800 | [diff] [blame] | 3882 | if (ret) |
Steven Rostedt | 93eb677 | 2009-04-15 13:24:06 -0400 | [diff] [blame] | 3883 | pr_warning("Failed to register trace ftrace module notifier\n"); |
| 3884 | |
Steven Rostedt | 2af15d6 | 2009-05-28 13:37:24 -0400 | [diff] [blame] | 3885 | set_ftrace_early_filters(); |
| 3886 | |
Steven Rostedt | 68bf21a | 2008-08-14 15:45:08 -0400 | [diff] [blame] | 3887 | return; |
| 3888 | failed: |
| 3889 | ftrace_disabled = 1; |
| 3890 | } |
Steven Rostedt | 68bf21a | 2008-08-14 15:45:08 -0400 | [diff] [blame] | 3891 | |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3892 | #else |
Frederic Weisbecker | 0b6e4d5 | 2008-10-28 20:17:38 +0100 | [diff] [blame] | 3893 | |
Steven Rostedt | 2b49938 | 2011-05-03 22:49:52 -0400 | [diff] [blame] | 3894 | static struct ftrace_ops global_ops = { |
Steven Rostedt | bd69c30 | 2011-05-03 21:55:54 -0400 | [diff] [blame] | 3895 | .func = ftrace_stub, |
| 3896 | }; |
| 3897 | |
Frederic Weisbecker | 0b6e4d5 | 2008-10-28 20:17:38 +0100 | [diff] [blame] | 3898 | static int __init ftrace_nodyn_init(void) |
| 3899 | { |
| 3900 | ftrace_enabled = 1; |
| 3901 | return 0; |
| 3902 | } |
| 3903 | device_initcall(ftrace_nodyn_init); |
| 3904 | |
Steven Rostedt | df4fc31 | 2008-11-26 00:16:23 -0500 | [diff] [blame] | 3905 | static inline int ftrace_init_dyn_debugfs(struct dentry *d_tracer) { return 0; } |
| 3906 | static inline void ftrace_startup_enable(int command) { } |
Steven Rostedt | 5a45cfe | 2008-11-26 00:16:24 -0500 | [diff] [blame] | 3907 | /* Keep as macros so we do not need to define the commands */ |
Steven Rostedt | 3b6cfdb | 2011-05-23 15:33:49 -0400 | [diff] [blame] | 3908 | # define ftrace_startup(ops, command) \ |
| 3909 | ({ \ |
| 3910 | (ops)->flags |= FTRACE_OPS_FL_ENABLED; \ |
| 3911 | 0; \ |
| 3912 | }) |
Steven Rostedt | bd69c30 | 2011-05-03 21:55:54 -0400 | [diff] [blame] | 3913 | # define ftrace_shutdown(ops, command) do { } while (0) |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 3914 | # define ftrace_startup_sysctl() do { } while (0) |
| 3915 | # define ftrace_shutdown_sysctl() do { } while (0) |
Steven Rostedt | b848914 | 2011-05-04 09:27:52 -0400 | [diff] [blame] | 3916 | |
| 3917 | static inline int |
| 3918 | ftrace_ops_test(struct ftrace_ops *ops, unsigned long ip) |
| 3919 | { |
| 3920 | return 1; |
| 3921 | } |
| 3922 | |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3923 | #endif /* CONFIG_DYNAMIC_FTRACE */ |
| 3924 | |
Steven Rostedt | b848914 | 2011-05-04 09:27:52 -0400 | [diff] [blame] | 3925 | static void |
Jiri Olsa | e248491 | 2012-02-15 15:51:48 +0100 | [diff] [blame] | 3926 | ftrace_ops_control_func(unsigned long ip, unsigned long parent_ip) |
| 3927 | { |
| 3928 | struct ftrace_ops *op; |
| 3929 | |
| 3930 | if (unlikely(trace_recursion_test(TRACE_CONTROL_BIT))) |
| 3931 | return; |
| 3932 | |
| 3933 | /* |
| 3934 | * Some of the ops may be dynamically allocated, |
| 3935 | * they must be freed after a synchronize_sched(). |
| 3936 | */ |
| 3937 | preempt_disable_notrace(); |
| 3938 | trace_recursion_set(TRACE_CONTROL_BIT); |
| 3939 | op = rcu_dereference_raw(ftrace_control_list); |
| 3940 | while (op != &ftrace_list_end) { |
| 3941 | if (!ftrace_function_local_disabled(op) && |
| 3942 | ftrace_ops_test(op, ip)) |
| 3943 | op->func(ip, parent_ip); |
| 3944 | |
| 3945 | op = rcu_dereference_raw(op->next); |
| 3946 | }; |
| 3947 | trace_recursion_clear(TRACE_CONTROL_BIT); |
| 3948 | preempt_enable_notrace(); |
| 3949 | } |
| 3950 | |
| 3951 | static struct ftrace_ops control_ops = { |
| 3952 | .func = ftrace_ops_control_func, |
| 3953 | }; |
| 3954 | |
| 3955 | static void |
Steven Rostedt | b848914 | 2011-05-04 09:27:52 -0400 | [diff] [blame] | 3956 | ftrace_ops_list_func(unsigned long ip, unsigned long parent_ip) |
| 3957 | { |
Steven Rostedt | cdbe61b | 2011-05-05 21:14:55 -0400 | [diff] [blame] | 3958 | struct ftrace_ops *op; |
Steven Rostedt | b848914 | 2011-05-04 09:27:52 -0400 | [diff] [blame] | 3959 | |
Steven Rostedt | b1cff0a | 2011-05-25 14:27:43 -0400 | [diff] [blame] | 3960 | if (unlikely(trace_recursion_test(TRACE_INTERNAL_BIT))) |
| 3961 | return; |
| 3962 | |
| 3963 | trace_recursion_set(TRACE_INTERNAL_BIT); |
Steven Rostedt | cdbe61b | 2011-05-05 21:14:55 -0400 | [diff] [blame] | 3964 | /* |
| 3965 | * Some of the ops may be dynamically allocated, |
| 3966 | * they must be freed after a synchronize_sched(). |
| 3967 | */ |
| 3968 | preempt_disable_notrace(); |
| 3969 | op = rcu_dereference_raw(ftrace_ops_list); |
Steven Rostedt | b848914 | 2011-05-04 09:27:52 -0400 | [diff] [blame] | 3970 | while (op != &ftrace_list_end) { |
| 3971 | if (ftrace_ops_test(op, ip)) |
| 3972 | op->func(ip, parent_ip); |
| 3973 | op = rcu_dereference_raw(op->next); |
| 3974 | }; |
Steven Rostedt | cdbe61b | 2011-05-05 21:14:55 -0400 | [diff] [blame] | 3975 | preempt_enable_notrace(); |
Steven Rostedt | b1cff0a | 2011-05-25 14:27:43 -0400 | [diff] [blame] | 3976 | trace_recursion_clear(TRACE_INTERNAL_BIT); |
Steven Rostedt | b848914 | 2011-05-04 09:27:52 -0400 | [diff] [blame] | 3977 | } |
| 3978 | |
Steven Rostedt | e32d895 | 2008-12-04 00:26:41 -0500 | [diff] [blame] | 3979 | static void clear_ftrace_swapper(void) |
| 3980 | { |
| 3981 | struct task_struct *p; |
| 3982 | int cpu; |
| 3983 | |
| 3984 | get_online_cpus(); |
| 3985 | for_each_online_cpu(cpu) { |
| 3986 | p = idle_task(cpu); |
| 3987 | clear_tsk_trace_trace(p); |
| 3988 | } |
| 3989 | put_online_cpus(); |
| 3990 | } |
| 3991 | |
| 3992 | static void set_ftrace_swapper(void) |
| 3993 | { |
| 3994 | struct task_struct *p; |
| 3995 | int cpu; |
| 3996 | |
| 3997 | get_online_cpus(); |
| 3998 | for_each_online_cpu(cpu) { |
| 3999 | p = idle_task(cpu); |
| 4000 | set_tsk_trace_trace(p); |
| 4001 | } |
| 4002 | put_online_cpus(); |
| 4003 | } |
| 4004 | |
| 4005 | static void clear_ftrace_pid(struct pid *pid) |
Steven Rostedt | 978f3a4 | 2008-12-04 00:26:40 -0500 | [diff] [blame] | 4006 | { |
| 4007 | struct task_struct *p; |
| 4008 | |
Oleg Nesterov | 229c4ef | 2009-02-03 20:39:04 +0100 | [diff] [blame] | 4009 | rcu_read_lock(); |
Steven Rostedt | e32d895 | 2008-12-04 00:26:41 -0500 | [diff] [blame] | 4010 | do_each_pid_task(pid, PIDTYPE_PID, p) { |
Steven Rostedt | 978f3a4 | 2008-12-04 00:26:40 -0500 | [diff] [blame] | 4011 | clear_tsk_trace_trace(p); |
Steven Rostedt | e32d895 | 2008-12-04 00:26:41 -0500 | [diff] [blame] | 4012 | } while_each_pid_task(pid, PIDTYPE_PID, p); |
Oleg Nesterov | 229c4ef | 2009-02-03 20:39:04 +0100 | [diff] [blame] | 4013 | rcu_read_unlock(); |
| 4014 | |
Steven Rostedt | e32d895 | 2008-12-04 00:26:41 -0500 | [diff] [blame] | 4015 | put_pid(pid); |
Steven Rostedt | 978f3a4 | 2008-12-04 00:26:40 -0500 | [diff] [blame] | 4016 | } |
| 4017 | |
Steven Rostedt | e32d895 | 2008-12-04 00:26:41 -0500 | [diff] [blame] | 4018 | static void set_ftrace_pid(struct pid *pid) |
Steven Rostedt | 978f3a4 | 2008-12-04 00:26:40 -0500 | [diff] [blame] | 4019 | { |
| 4020 | struct task_struct *p; |
| 4021 | |
Oleg Nesterov | 229c4ef | 2009-02-03 20:39:04 +0100 | [diff] [blame] | 4022 | rcu_read_lock(); |
Steven Rostedt | 978f3a4 | 2008-12-04 00:26:40 -0500 | [diff] [blame] | 4023 | do_each_pid_task(pid, PIDTYPE_PID, p) { |
| 4024 | set_tsk_trace_trace(p); |
| 4025 | } while_each_pid_task(pid, PIDTYPE_PID, p); |
Oleg Nesterov | 229c4ef | 2009-02-03 20:39:04 +0100 | [diff] [blame] | 4026 | rcu_read_unlock(); |
Steven Rostedt | 978f3a4 | 2008-12-04 00:26:40 -0500 | [diff] [blame] | 4027 | } |
| 4028 | |
jolsa@redhat.com | 756d17e | 2009-10-13 16:33:52 -0400 | [diff] [blame] | 4029 | static void clear_ftrace_pid_task(struct pid *pid) |
Steven Rostedt | e32d895 | 2008-12-04 00:26:41 -0500 | [diff] [blame] | 4030 | { |
jolsa@redhat.com | 756d17e | 2009-10-13 16:33:52 -0400 | [diff] [blame] | 4031 | if (pid == ftrace_swapper_pid) |
Steven Rostedt | e32d895 | 2008-12-04 00:26:41 -0500 | [diff] [blame] | 4032 | clear_ftrace_swapper(); |
| 4033 | else |
jolsa@redhat.com | 756d17e | 2009-10-13 16:33:52 -0400 | [diff] [blame] | 4034 | clear_ftrace_pid(pid); |
Steven Rostedt | e32d895 | 2008-12-04 00:26:41 -0500 | [diff] [blame] | 4035 | } |
| 4036 | |
| 4037 | static void set_ftrace_pid_task(struct pid *pid) |
| 4038 | { |
| 4039 | if (pid == ftrace_swapper_pid) |
| 4040 | set_ftrace_swapper(); |
| 4041 | else |
| 4042 | set_ftrace_pid(pid); |
| 4043 | } |
| 4044 | |
jolsa@redhat.com | 756d17e | 2009-10-13 16:33:52 -0400 | [diff] [blame] | 4045 | static int ftrace_pid_add(int p) |
| 4046 | { |
| 4047 | struct pid *pid; |
| 4048 | struct ftrace_pid *fpid; |
| 4049 | int ret = -EINVAL; |
| 4050 | |
| 4051 | mutex_lock(&ftrace_lock); |
| 4052 | |
| 4053 | if (!p) |
| 4054 | pid = ftrace_swapper_pid; |
| 4055 | else |
| 4056 | pid = find_get_pid(p); |
| 4057 | |
| 4058 | if (!pid) |
| 4059 | goto out; |
| 4060 | |
| 4061 | ret = 0; |
| 4062 | |
| 4063 | list_for_each_entry(fpid, &ftrace_pids, list) |
| 4064 | if (fpid->pid == pid) |
| 4065 | goto out_put; |
| 4066 | |
| 4067 | ret = -ENOMEM; |
| 4068 | |
| 4069 | fpid = kmalloc(sizeof(*fpid), GFP_KERNEL); |
| 4070 | if (!fpid) |
| 4071 | goto out_put; |
| 4072 | |
| 4073 | list_add(&fpid->list, &ftrace_pids); |
| 4074 | fpid->pid = pid; |
| 4075 | |
| 4076 | set_ftrace_pid_task(pid); |
| 4077 | |
| 4078 | ftrace_update_pid_func(); |
| 4079 | ftrace_startup_enable(0); |
| 4080 | |
| 4081 | mutex_unlock(&ftrace_lock); |
| 4082 | return 0; |
| 4083 | |
| 4084 | out_put: |
| 4085 | if (pid != ftrace_swapper_pid) |
| 4086 | put_pid(pid); |
| 4087 | |
| 4088 | out: |
| 4089 | mutex_unlock(&ftrace_lock); |
| 4090 | return ret; |
| 4091 | } |
| 4092 | |
| 4093 | static void ftrace_pid_reset(void) |
| 4094 | { |
| 4095 | struct ftrace_pid *fpid, *safe; |
| 4096 | |
| 4097 | mutex_lock(&ftrace_lock); |
| 4098 | list_for_each_entry_safe(fpid, safe, &ftrace_pids, list) { |
| 4099 | struct pid *pid = fpid->pid; |
| 4100 | |
| 4101 | clear_ftrace_pid_task(pid); |
| 4102 | |
| 4103 | list_del(&fpid->list); |
| 4104 | kfree(fpid); |
| 4105 | } |
| 4106 | |
| 4107 | ftrace_update_pid_func(); |
| 4108 | ftrace_startup_enable(0); |
| 4109 | |
| 4110 | mutex_unlock(&ftrace_lock); |
| 4111 | } |
| 4112 | |
| 4113 | static void *fpid_start(struct seq_file *m, loff_t *pos) |
| 4114 | { |
| 4115 | mutex_lock(&ftrace_lock); |
| 4116 | |
| 4117 | if (list_empty(&ftrace_pids) && (!*pos)) |
| 4118 | return (void *) 1; |
| 4119 | |
| 4120 | return seq_list_start(&ftrace_pids, *pos); |
| 4121 | } |
| 4122 | |
| 4123 | static void *fpid_next(struct seq_file *m, void *v, loff_t *pos) |
| 4124 | { |
| 4125 | if (v == (void *)1) |
| 4126 | return NULL; |
| 4127 | |
| 4128 | return seq_list_next(v, &ftrace_pids, pos); |
| 4129 | } |
| 4130 | |
| 4131 | static void fpid_stop(struct seq_file *m, void *p) |
| 4132 | { |
| 4133 | mutex_unlock(&ftrace_lock); |
| 4134 | } |
| 4135 | |
| 4136 | static int fpid_show(struct seq_file *m, void *v) |
| 4137 | { |
| 4138 | const struct ftrace_pid *fpid = list_entry(v, struct ftrace_pid, list); |
| 4139 | |
| 4140 | if (v == (void *)1) { |
| 4141 | seq_printf(m, "no pid\n"); |
| 4142 | return 0; |
| 4143 | } |
| 4144 | |
| 4145 | if (fpid->pid == ftrace_swapper_pid) |
| 4146 | seq_printf(m, "swapper tasks\n"); |
| 4147 | else |
| 4148 | seq_printf(m, "%u\n", pid_vnr(fpid->pid)); |
| 4149 | |
| 4150 | return 0; |
| 4151 | } |
| 4152 | |
| 4153 | static const struct seq_operations ftrace_pid_sops = { |
| 4154 | .start = fpid_start, |
| 4155 | .next = fpid_next, |
| 4156 | .stop = fpid_stop, |
| 4157 | .show = fpid_show, |
| 4158 | }; |
| 4159 | |
| 4160 | static int |
| 4161 | ftrace_pid_open(struct inode *inode, struct file *file) |
| 4162 | { |
| 4163 | int ret = 0; |
| 4164 | |
| 4165 | if ((file->f_mode & FMODE_WRITE) && |
| 4166 | (file->f_flags & O_TRUNC)) |
| 4167 | ftrace_pid_reset(); |
| 4168 | |
| 4169 | if (file->f_mode & FMODE_READ) |
| 4170 | ret = seq_open(file, &ftrace_pid_sops); |
| 4171 | |
| 4172 | return ret; |
| 4173 | } |
| 4174 | |
Steven Rostedt | df4fc31 | 2008-11-26 00:16:23 -0500 | [diff] [blame] | 4175 | static ssize_t |
| 4176 | ftrace_pid_write(struct file *filp, const char __user *ubuf, |
| 4177 | size_t cnt, loff_t *ppos) |
| 4178 | { |
Ingo Molnar | 457dc92 | 2009-11-23 11:03:28 +0100 | [diff] [blame] | 4179 | char buf[64], *tmp; |
Steven Rostedt | df4fc31 | 2008-11-26 00:16:23 -0500 | [diff] [blame] | 4180 | long val; |
| 4181 | int ret; |
| 4182 | |
| 4183 | if (cnt >= sizeof(buf)) |
| 4184 | return -EINVAL; |
| 4185 | |
| 4186 | if (copy_from_user(&buf, ubuf, cnt)) |
| 4187 | return -EFAULT; |
| 4188 | |
| 4189 | buf[cnt] = 0; |
| 4190 | |
jolsa@redhat.com | 756d17e | 2009-10-13 16:33:52 -0400 | [diff] [blame] | 4191 | /* |
| 4192 | * Allow "echo > set_ftrace_pid" or "echo -n '' > set_ftrace_pid" |
| 4193 | * to clean the filter quietly. |
| 4194 | */ |
Ingo Molnar | 457dc92 | 2009-11-23 11:03:28 +0100 | [diff] [blame] | 4195 | tmp = strstrip(buf); |
| 4196 | if (strlen(tmp) == 0) |
jolsa@redhat.com | 756d17e | 2009-10-13 16:33:52 -0400 | [diff] [blame] | 4197 | return 1; |
| 4198 | |
Ingo Molnar | 457dc92 | 2009-11-23 11:03:28 +0100 | [diff] [blame] | 4199 | ret = strict_strtol(tmp, 10, &val); |
Steven Rostedt | df4fc31 | 2008-11-26 00:16:23 -0500 | [diff] [blame] | 4200 | if (ret < 0) |
| 4201 | return ret; |
| 4202 | |
jolsa@redhat.com | 756d17e | 2009-10-13 16:33:52 -0400 | [diff] [blame] | 4203 | ret = ftrace_pid_add(val); |
Steven Rostedt | 978f3a4 | 2008-12-04 00:26:40 -0500 | [diff] [blame] | 4204 | |
jolsa@redhat.com | 756d17e | 2009-10-13 16:33:52 -0400 | [diff] [blame] | 4205 | return ret ? ret : cnt; |
| 4206 | } |
Steven Rostedt | df4fc31 | 2008-11-26 00:16:23 -0500 | [diff] [blame] | 4207 | |
jolsa@redhat.com | 756d17e | 2009-10-13 16:33:52 -0400 | [diff] [blame] | 4208 | static int |
| 4209 | ftrace_pid_release(struct inode *inode, struct file *file) |
| 4210 | { |
| 4211 | if (file->f_mode & FMODE_READ) |
| 4212 | seq_release(inode, file); |
Steven Rostedt | df4fc31 | 2008-11-26 00:16:23 -0500 | [diff] [blame] | 4213 | |
jolsa@redhat.com | 756d17e | 2009-10-13 16:33:52 -0400 | [diff] [blame] | 4214 | return 0; |
Steven Rostedt | df4fc31 | 2008-11-26 00:16:23 -0500 | [diff] [blame] | 4215 | } |
| 4216 | |
Steven Rostedt | 5e2336a | 2009-03-05 21:44:55 -0500 | [diff] [blame] | 4217 | static const struct file_operations ftrace_pid_fops = { |
jolsa@redhat.com | 756d17e | 2009-10-13 16:33:52 -0400 | [diff] [blame] | 4218 | .open = ftrace_pid_open, |
| 4219 | .write = ftrace_pid_write, |
| 4220 | .read = seq_read, |
| 4221 | .llseek = seq_lseek, |
| 4222 | .release = ftrace_pid_release, |
Steven Rostedt | df4fc31 | 2008-11-26 00:16:23 -0500 | [diff] [blame] | 4223 | }; |
| 4224 | |
| 4225 | static __init int ftrace_init_debugfs(void) |
| 4226 | { |
| 4227 | struct dentry *d_tracer; |
Steven Rostedt | df4fc31 | 2008-11-26 00:16:23 -0500 | [diff] [blame] | 4228 | |
| 4229 | d_tracer = tracing_init_dentry(); |
| 4230 | if (!d_tracer) |
| 4231 | return 0; |
| 4232 | |
| 4233 | ftrace_init_dyn_debugfs(d_tracer); |
| 4234 | |
Frederic Weisbecker | 5452af6 | 2009-03-27 00:25:38 +0100 | [diff] [blame] | 4235 | trace_create_file("set_ftrace_pid", 0644, d_tracer, |
| 4236 | NULL, &ftrace_pid_fops); |
Steven Rostedt | 493762f | 2009-03-23 17:12:36 -0400 | [diff] [blame] | 4237 | |
| 4238 | ftrace_profile_debugfs(d_tracer); |
| 4239 | |
Steven Rostedt | df4fc31 | 2008-11-26 00:16:23 -0500 | [diff] [blame] | 4240 | return 0; |
| 4241 | } |
Steven Rostedt | df4fc31 | 2008-11-26 00:16:23 -0500 | [diff] [blame] | 4242 | fs_initcall(ftrace_init_debugfs); |
| 4243 | |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 4244 | /** |
Steven Rostedt | 81adbdc | 2008-10-23 09:33:02 -0400 | [diff] [blame] | 4245 | * ftrace_kill - kill ftrace |
Steven Rostedt | a2bb6a3 | 2008-07-10 20:58:15 -0400 | [diff] [blame] | 4246 | * |
| 4247 | * This function should be used by panic code. It stops ftrace |
| 4248 | * but in a not so nice way. If you need to simply kill ftrace |
| 4249 | * from a non-atomic section, use ftrace_kill. |
| 4250 | */ |
Steven Rostedt | 81adbdc | 2008-10-23 09:33:02 -0400 | [diff] [blame] | 4251 | void ftrace_kill(void) |
Steven Rostedt | a2bb6a3 | 2008-07-10 20:58:15 -0400 | [diff] [blame] | 4252 | { |
| 4253 | ftrace_disabled = 1; |
| 4254 | ftrace_enabled = 0; |
Steven Rostedt | a2bb6a3 | 2008-07-10 20:58:15 -0400 | [diff] [blame] | 4255 | clear_ftrace_function(); |
| 4256 | } |
| 4257 | |
| 4258 | /** |
Steven Rostedt | e0a413f | 2011-09-29 21:26:16 -0400 | [diff] [blame] | 4259 | * Test if ftrace is dead or not. |
| 4260 | */ |
| 4261 | int ftrace_is_dead(void) |
| 4262 | { |
| 4263 | return ftrace_disabled; |
| 4264 | } |
| 4265 | |
| 4266 | /** |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 4267 | * register_ftrace_function - register a function for profiling |
| 4268 | * @ops - ops structure that holds the function for profiling. |
| 4269 | * |
| 4270 | * Register a function to be called by all functions in the |
| 4271 | * kernel. |
| 4272 | * |
| 4273 | * Note: @ops->func and all the functions it calls must be labeled |
| 4274 | * with "notrace", otherwise it will go into a |
| 4275 | * recursive loop. |
| 4276 | */ |
| 4277 | int register_ftrace_function(struct ftrace_ops *ops) |
| 4278 | { |
Steven Rostedt | 45a4a23 | 2011-04-21 23:16:46 -0400 | [diff] [blame] | 4279 | int ret = -1; |
Steven Rostedt | 4eebcc8 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 4280 | |
Steven Rostedt | e6ea44e | 2009-02-14 01:42:44 -0500 | [diff] [blame] | 4281 | mutex_lock(&ftrace_lock); |
Frederic Weisbecker | e7d3737 | 2008-11-16 06:02:06 +0100 | [diff] [blame] | 4282 | |
Steven Rostedt | 45a4a23 | 2011-04-21 23:16:46 -0400 | [diff] [blame] | 4283 | if (unlikely(ftrace_disabled)) |
| 4284 | goto out_unlock; |
| 4285 | |
Steven Rostedt | b0fc494 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 4286 | ret = __register_ftrace_function(ops); |
Steven Rostedt | b848914 | 2011-05-04 09:27:52 -0400 | [diff] [blame] | 4287 | if (!ret) |
Steven Rostedt | a1cd617 | 2011-05-23 15:24:25 -0400 | [diff] [blame] | 4288 | ret = ftrace_startup(ops, 0); |
Steven Rostedt | b848914 | 2011-05-04 09:27:52 -0400 | [diff] [blame] | 4289 | |
Steven Rostedt | b0fc494 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 4290 | |
Steven Rostedt | 45a4a23 | 2011-04-21 23:16:46 -0400 | [diff] [blame] | 4291 | out_unlock: |
Steven Rostedt | e6ea44e | 2009-02-14 01:42:44 -0500 | [diff] [blame] | 4292 | mutex_unlock(&ftrace_lock); |
Steven Rostedt | b0fc494 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 4293 | return ret; |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 4294 | } |
Steven Rostedt | cdbe61b | 2011-05-05 21:14:55 -0400 | [diff] [blame] | 4295 | EXPORT_SYMBOL_GPL(register_ftrace_function); |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 4296 | |
| 4297 | /** |
Uwe Kleine-Koenig | 3263292 | 2009-01-12 23:35:50 +0100 | [diff] [blame] | 4298 | * unregister_ftrace_function - unregister a function for profiling. |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 4299 | * @ops - ops structure that holds the function to unregister |
| 4300 | * |
| 4301 | * Unregister a function that was added to be called by ftrace profiling. |
| 4302 | */ |
| 4303 | int unregister_ftrace_function(struct ftrace_ops *ops) |
| 4304 | { |
| 4305 | int ret; |
| 4306 | |
Steven Rostedt | e6ea44e | 2009-02-14 01:42:44 -0500 | [diff] [blame] | 4307 | mutex_lock(&ftrace_lock); |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 4308 | ret = __unregister_ftrace_function(ops); |
Steven Rostedt | b848914 | 2011-05-04 09:27:52 -0400 | [diff] [blame] | 4309 | if (!ret) |
| 4310 | ftrace_shutdown(ops, 0); |
Steven Rostedt | e6ea44e | 2009-02-14 01:42:44 -0500 | [diff] [blame] | 4311 | mutex_unlock(&ftrace_lock); |
Steven Rostedt | b0fc494 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 4312 | |
| 4313 | return ret; |
| 4314 | } |
Steven Rostedt | cdbe61b | 2011-05-05 21:14:55 -0400 | [diff] [blame] | 4315 | EXPORT_SYMBOL_GPL(unregister_ftrace_function); |
Steven Rostedt | b0fc494 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 4316 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 4317 | int |
Steven Rostedt | b0fc494 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 4318 | ftrace_enable_sysctl(struct ctl_table *table, int write, |
Alexey Dobriyan | 8d65af7 | 2009-09-23 15:57:19 -0700 | [diff] [blame] | 4319 | void __user *buffer, size_t *lenp, |
Steven Rostedt | b0fc494 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 4320 | loff_t *ppos) |
| 4321 | { |
Steven Rostedt | 45a4a23 | 2011-04-21 23:16:46 -0400 | [diff] [blame] | 4322 | int ret = -ENODEV; |
Steven Rostedt | 4eebcc8 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 4323 | |
Steven Rostedt | e6ea44e | 2009-02-14 01:42:44 -0500 | [diff] [blame] | 4324 | mutex_lock(&ftrace_lock); |
Steven Rostedt | b0fc494 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 4325 | |
Steven Rostedt | 45a4a23 | 2011-04-21 23:16:46 -0400 | [diff] [blame] | 4326 | if (unlikely(ftrace_disabled)) |
| 4327 | goto out; |
| 4328 | |
| 4329 | ret = proc_dointvec(table, write, buffer, lenp, ppos); |
Steven Rostedt | b0fc494 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 4330 | |
Li Zefan | a32c776 | 2009-06-26 16:55:51 +0800 | [diff] [blame] | 4331 | if (ret || !write || (last_ftrace_enabled == !!ftrace_enabled)) |
Steven Rostedt | b0fc494 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 4332 | goto out; |
| 4333 | |
Li Zefan | a32c776 | 2009-06-26 16:55:51 +0800 | [diff] [blame] | 4334 | last_ftrace_enabled = !!ftrace_enabled; |
Steven Rostedt | b0fc494 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 4335 | |
| 4336 | if (ftrace_enabled) { |
| 4337 | |
| 4338 | ftrace_startup_sysctl(); |
| 4339 | |
| 4340 | /* we are starting ftrace again */ |
Steven Rostedt | b848914 | 2011-05-04 09:27:52 -0400 | [diff] [blame] | 4341 | if (ftrace_ops_list != &ftrace_list_end) { |
| 4342 | if (ftrace_ops_list->next == &ftrace_list_end) |
| 4343 | ftrace_trace_function = ftrace_ops_list->func; |
Steven Rostedt | b0fc494 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 4344 | else |
Steven Rostedt | b848914 | 2011-05-04 09:27:52 -0400 | [diff] [blame] | 4345 | ftrace_trace_function = ftrace_ops_list_func; |
Steven Rostedt | b0fc494 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 4346 | } |
| 4347 | |
| 4348 | } else { |
| 4349 | /* stopping ftrace calls (just send to ftrace_stub) */ |
| 4350 | ftrace_trace_function = ftrace_stub; |
| 4351 | |
| 4352 | ftrace_shutdown_sysctl(); |
| 4353 | } |
| 4354 | |
| 4355 | out: |
Steven Rostedt | e6ea44e | 2009-02-14 01:42:44 -0500 | [diff] [blame] | 4356 | mutex_unlock(&ftrace_lock); |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 4357 | return ret; |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 4358 | } |
Ingo Molnar | f17845e | 2008-10-24 12:47:10 +0200 | [diff] [blame] | 4359 | |
Frederic Weisbecker | fb52607 | 2008-11-25 21:07:04 +0100 | [diff] [blame] | 4360 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
Frederic Weisbecker | e7d3737 | 2008-11-16 06:02:06 +0100 | [diff] [blame] | 4361 | |
Steven Rostedt | 597af81 | 2009-04-03 15:24:12 -0400 | [diff] [blame] | 4362 | static int ftrace_graph_active; |
Frederic Weisbecker | 4a2b8dd | 2009-01-14 13:33:27 -0800 | [diff] [blame] | 4363 | static struct notifier_block ftrace_suspend_notifier; |
Frederic Weisbecker | f201ae2 | 2008-11-23 06:22:56 +0100 | [diff] [blame] | 4364 | |
Steven Rostedt | e49dc19 | 2008-12-02 23:50:05 -0500 | [diff] [blame] | 4365 | int ftrace_graph_entry_stub(struct ftrace_graph_ent *trace) |
| 4366 | { |
| 4367 | return 0; |
| 4368 | } |
| 4369 | |
Frederic Weisbecker | 287b6e6 | 2008-11-26 00:57:25 +0100 | [diff] [blame] | 4370 | /* The callbacks that hook a function */ |
| 4371 | trace_func_graph_ret_t ftrace_graph_return = |
| 4372 | (trace_func_graph_ret_t)ftrace_stub; |
Steven Rostedt | e49dc19 | 2008-12-02 23:50:05 -0500 | [diff] [blame] | 4373 | trace_func_graph_ent_t ftrace_graph_entry = ftrace_graph_entry_stub; |
Frederic Weisbecker | f201ae2 | 2008-11-23 06:22:56 +0100 | [diff] [blame] | 4374 | |
| 4375 | /* Try to assign a return stack array on FTRACE_RETSTACK_ALLOC_SIZE tasks. */ |
| 4376 | static int alloc_retstack_tasklist(struct ftrace_ret_stack **ret_stack_list) |
| 4377 | { |
| 4378 | int i; |
| 4379 | int ret = 0; |
| 4380 | unsigned long flags; |
| 4381 | int start = 0, end = FTRACE_RETSTACK_ALLOC_SIZE; |
| 4382 | struct task_struct *g, *t; |
| 4383 | |
| 4384 | for (i = 0; i < FTRACE_RETSTACK_ALLOC_SIZE; i++) { |
| 4385 | ret_stack_list[i] = kmalloc(FTRACE_RETFUNC_DEPTH |
| 4386 | * sizeof(struct ftrace_ret_stack), |
| 4387 | GFP_KERNEL); |
| 4388 | if (!ret_stack_list[i]) { |
| 4389 | start = 0; |
| 4390 | end = i; |
| 4391 | ret = -ENOMEM; |
| 4392 | goto free; |
| 4393 | } |
| 4394 | } |
| 4395 | |
| 4396 | read_lock_irqsave(&tasklist_lock, flags); |
| 4397 | do_each_thread(g, t) { |
| 4398 | if (start == end) { |
| 4399 | ret = -EAGAIN; |
| 4400 | goto unlock; |
| 4401 | } |
| 4402 | |
| 4403 | if (t->ret_stack == NULL) { |
Frederic Weisbecker | 380c4b1 | 2008-12-06 03:43:41 +0100 | [diff] [blame] | 4404 | atomic_set(&t->tracing_graph_pause, 0); |
Frederic Weisbecker | f201ae2 | 2008-11-23 06:22:56 +0100 | [diff] [blame] | 4405 | atomic_set(&t->trace_overrun, 0); |
Steven Rostedt | 26c0162 | 2009-06-02 14:01:19 -0400 | [diff] [blame] | 4406 | t->curr_ret_stack = -1; |
| 4407 | /* Make sure the tasks see the -1 first: */ |
| 4408 | smp_wmb(); |
| 4409 | t->ret_stack = ret_stack_list[start++]; |
Frederic Weisbecker | f201ae2 | 2008-11-23 06:22:56 +0100 | [diff] [blame] | 4410 | } |
| 4411 | } while_each_thread(g, t); |
| 4412 | |
| 4413 | unlock: |
| 4414 | read_unlock_irqrestore(&tasklist_lock, flags); |
| 4415 | free: |
| 4416 | for (i = start; i < end; i++) |
| 4417 | kfree(ret_stack_list[i]); |
| 4418 | return ret; |
| 4419 | } |
| 4420 | |
Steven Rostedt | 8aef2d2 | 2009-03-24 01:10:15 -0400 | [diff] [blame] | 4421 | static void |
Steven Rostedt | 38516ab | 2010-04-20 17:04:50 -0400 | [diff] [blame] | 4422 | ftrace_graph_probe_sched_switch(void *ignore, |
| 4423 | struct task_struct *prev, struct task_struct *next) |
Steven Rostedt | 8aef2d2 | 2009-03-24 01:10:15 -0400 | [diff] [blame] | 4424 | { |
| 4425 | unsigned long long timestamp; |
| 4426 | int index; |
| 4427 | |
Steven Rostedt | be6f164 | 2009-03-24 11:06:24 -0400 | [diff] [blame] | 4428 | /* |
| 4429 | * Does the user want to count the time a function was asleep. |
| 4430 | * If so, do not update the time stamps. |
| 4431 | */ |
| 4432 | if (trace_flags & TRACE_ITER_SLEEP_TIME) |
| 4433 | return; |
| 4434 | |
Steven Rostedt | 8aef2d2 | 2009-03-24 01:10:15 -0400 | [diff] [blame] | 4435 | timestamp = trace_clock_local(); |
| 4436 | |
| 4437 | prev->ftrace_timestamp = timestamp; |
| 4438 | |
| 4439 | /* only process tasks that we timestamped */ |
| 4440 | if (!next->ftrace_timestamp) |
| 4441 | return; |
| 4442 | |
| 4443 | /* |
| 4444 | * Update all the counters in next to make up for the |
| 4445 | * time next was sleeping. |
| 4446 | */ |
| 4447 | timestamp -= next->ftrace_timestamp; |
| 4448 | |
| 4449 | for (index = next->curr_ret_stack; index >= 0; index--) |
| 4450 | next->ret_stack[index].calltime += timestamp; |
| 4451 | } |
| 4452 | |
Frederic Weisbecker | f201ae2 | 2008-11-23 06:22:56 +0100 | [diff] [blame] | 4453 | /* Allocate a return stack for each task */ |
Frederic Weisbecker | fb52607 | 2008-11-25 21:07:04 +0100 | [diff] [blame] | 4454 | static int start_graph_tracing(void) |
Frederic Weisbecker | f201ae2 | 2008-11-23 06:22:56 +0100 | [diff] [blame] | 4455 | { |
| 4456 | struct ftrace_ret_stack **ret_stack_list; |
Frederic Weisbecker | 5b058bc | 2009-02-17 18:35:34 +0100 | [diff] [blame] | 4457 | int ret, cpu; |
Frederic Weisbecker | f201ae2 | 2008-11-23 06:22:56 +0100 | [diff] [blame] | 4458 | |
| 4459 | ret_stack_list = kmalloc(FTRACE_RETSTACK_ALLOC_SIZE * |
| 4460 | sizeof(struct ftrace_ret_stack *), |
| 4461 | GFP_KERNEL); |
| 4462 | |
| 4463 | if (!ret_stack_list) |
| 4464 | return -ENOMEM; |
| 4465 | |
Frederic Weisbecker | 5b058bc | 2009-02-17 18:35:34 +0100 | [diff] [blame] | 4466 | /* The cpu_boot init_task->ret_stack will never be freed */ |
Steven Rostedt | 179c498 | 2009-06-02 12:03:19 -0400 | [diff] [blame] | 4467 | for_each_online_cpu(cpu) { |
| 4468 | if (!idle_task(cpu)->ret_stack) |
Steven Rostedt | 868baf0 | 2011-02-10 21:26:13 -0500 | [diff] [blame] | 4469 | ftrace_graph_init_idle_task(idle_task(cpu), cpu); |
Steven Rostedt | 179c498 | 2009-06-02 12:03:19 -0400 | [diff] [blame] | 4470 | } |
Frederic Weisbecker | 5b058bc | 2009-02-17 18:35:34 +0100 | [diff] [blame] | 4471 | |
Frederic Weisbecker | f201ae2 | 2008-11-23 06:22:56 +0100 | [diff] [blame] | 4472 | do { |
| 4473 | ret = alloc_retstack_tasklist(ret_stack_list); |
| 4474 | } while (ret == -EAGAIN); |
| 4475 | |
Steven Rostedt | 8aef2d2 | 2009-03-24 01:10:15 -0400 | [diff] [blame] | 4476 | if (!ret) { |
Steven Rostedt | 38516ab | 2010-04-20 17:04:50 -0400 | [diff] [blame] | 4477 | ret = register_trace_sched_switch(ftrace_graph_probe_sched_switch, NULL); |
Steven Rostedt | 8aef2d2 | 2009-03-24 01:10:15 -0400 | [diff] [blame] | 4478 | if (ret) |
| 4479 | pr_info("ftrace_graph: Couldn't activate tracepoint" |
| 4480 | " probe to kernel_sched_switch\n"); |
| 4481 | } |
| 4482 | |
Frederic Weisbecker | f201ae2 | 2008-11-23 06:22:56 +0100 | [diff] [blame] | 4483 | kfree(ret_stack_list); |
| 4484 | return ret; |
| 4485 | } |
| 4486 | |
Frederic Weisbecker | 4a2b8dd | 2009-01-14 13:33:27 -0800 | [diff] [blame] | 4487 | /* |
| 4488 | * Hibernation protection. |
| 4489 | * The state of the current task is too much unstable during |
| 4490 | * suspend/restore to disk. We want to protect against that. |
| 4491 | */ |
| 4492 | static int |
| 4493 | ftrace_suspend_notifier_call(struct notifier_block *bl, unsigned long state, |
| 4494 | void *unused) |
| 4495 | { |
| 4496 | switch (state) { |
| 4497 | case PM_HIBERNATION_PREPARE: |
| 4498 | pause_graph_tracing(); |
| 4499 | break; |
| 4500 | |
| 4501 | case PM_POST_HIBERNATION: |
| 4502 | unpause_graph_tracing(); |
| 4503 | break; |
| 4504 | } |
| 4505 | return NOTIFY_DONE; |
| 4506 | } |
| 4507 | |
Frederic Weisbecker | 287b6e6 | 2008-11-26 00:57:25 +0100 | [diff] [blame] | 4508 | int register_ftrace_graph(trace_func_graph_ret_t retfunc, |
| 4509 | trace_func_graph_ent_t entryfunc) |
Frederic Weisbecker | 15e6cb3 | 2008-11-11 07:14:25 +0100 | [diff] [blame] | 4510 | { |
Frederic Weisbecker | e7d3737 | 2008-11-16 06:02:06 +0100 | [diff] [blame] | 4511 | int ret = 0; |
| 4512 | |
Steven Rostedt | e6ea44e | 2009-02-14 01:42:44 -0500 | [diff] [blame] | 4513 | mutex_lock(&ftrace_lock); |
Frederic Weisbecker | e7d3737 | 2008-11-16 06:02:06 +0100 | [diff] [blame] | 4514 | |
Steven Rostedt | 05ce581 | 2009-03-24 00:18:31 -0400 | [diff] [blame] | 4515 | /* we currently allow only one tracer registered at a time */ |
Steven Rostedt | 597af81 | 2009-04-03 15:24:12 -0400 | [diff] [blame] | 4516 | if (ftrace_graph_active) { |
Steven Rostedt | 05ce581 | 2009-03-24 00:18:31 -0400 | [diff] [blame] | 4517 | ret = -EBUSY; |
| 4518 | goto out; |
| 4519 | } |
| 4520 | |
Frederic Weisbecker | 4a2b8dd | 2009-01-14 13:33:27 -0800 | [diff] [blame] | 4521 | ftrace_suspend_notifier.notifier_call = ftrace_suspend_notifier_call; |
| 4522 | register_pm_notifier(&ftrace_suspend_notifier); |
| 4523 | |
Steven Rostedt | 597af81 | 2009-04-03 15:24:12 -0400 | [diff] [blame] | 4524 | ftrace_graph_active++; |
Frederic Weisbecker | fb52607 | 2008-11-25 21:07:04 +0100 | [diff] [blame] | 4525 | ret = start_graph_tracing(); |
Frederic Weisbecker | f201ae2 | 2008-11-23 06:22:56 +0100 | [diff] [blame] | 4526 | if (ret) { |
Steven Rostedt | 597af81 | 2009-04-03 15:24:12 -0400 | [diff] [blame] | 4527 | ftrace_graph_active--; |
Frederic Weisbecker | f201ae2 | 2008-11-23 06:22:56 +0100 | [diff] [blame] | 4528 | goto out; |
| 4529 | } |
Steven Rostedt | e53a631 | 2008-11-26 00:16:25 -0500 | [diff] [blame] | 4530 | |
Frederic Weisbecker | 287b6e6 | 2008-11-26 00:57:25 +0100 | [diff] [blame] | 4531 | ftrace_graph_return = retfunc; |
| 4532 | ftrace_graph_entry = entryfunc; |
Steven Rostedt | e53a631 | 2008-11-26 00:16:25 -0500 | [diff] [blame] | 4533 | |
Steven Rostedt | a1cd617 | 2011-05-23 15:24:25 -0400 | [diff] [blame] | 4534 | ret = ftrace_startup(&global_ops, FTRACE_START_FUNC_RET); |
Frederic Weisbecker | e7d3737 | 2008-11-16 06:02:06 +0100 | [diff] [blame] | 4535 | |
| 4536 | out: |
Steven Rostedt | e6ea44e | 2009-02-14 01:42:44 -0500 | [diff] [blame] | 4537 | mutex_unlock(&ftrace_lock); |
Frederic Weisbecker | e7d3737 | 2008-11-16 06:02:06 +0100 | [diff] [blame] | 4538 | return ret; |
Frederic Weisbecker | 15e6cb3 | 2008-11-11 07:14:25 +0100 | [diff] [blame] | 4539 | } |
| 4540 | |
Frederic Weisbecker | fb52607 | 2008-11-25 21:07:04 +0100 | [diff] [blame] | 4541 | void unregister_ftrace_graph(void) |
Frederic Weisbecker | 15e6cb3 | 2008-11-11 07:14:25 +0100 | [diff] [blame] | 4542 | { |
Steven Rostedt | e6ea44e | 2009-02-14 01:42:44 -0500 | [diff] [blame] | 4543 | mutex_lock(&ftrace_lock); |
Frederic Weisbecker | e7d3737 | 2008-11-16 06:02:06 +0100 | [diff] [blame] | 4544 | |
Steven Rostedt | 597af81 | 2009-04-03 15:24:12 -0400 | [diff] [blame] | 4545 | if (unlikely(!ftrace_graph_active)) |
Steven Rostedt | 2aad1b7 | 2009-03-30 11:11:28 -0400 | [diff] [blame] | 4546 | goto out; |
| 4547 | |
Steven Rostedt | 597af81 | 2009-04-03 15:24:12 -0400 | [diff] [blame] | 4548 | ftrace_graph_active--; |
Frederic Weisbecker | 287b6e6 | 2008-11-26 00:57:25 +0100 | [diff] [blame] | 4549 | ftrace_graph_return = (trace_func_graph_ret_t)ftrace_stub; |
Steven Rostedt | e49dc19 | 2008-12-02 23:50:05 -0500 | [diff] [blame] | 4550 | ftrace_graph_entry = ftrace_graph_entry_stub; |
Steven Rostedt | bd69c30 | 2011-05-03 21:55:54 -0400 | [diff] [blame] | 4551 | ftrace_shutdown(&global_ops, FTRACE_STOP_FUNC_RET); |
Frederic Weisbecker | 4a2b8dd | 2009-01-14 13:33:27 -0800 | [diff] [blame] | 4552 | unregister_pm_notifier(&ftrace_suspend_notifier); |
Steven Rostedt | 38516ab | 2010-04-20 17:04:50 -0400 | [diff] [blame] | 4553 | unregister_trace_sched_switch(ftrace_graph_probe_sched_switch, NULL); |
Frederic Weisbecker | e7d3737 | 2008-11-16 06:02:06 +0100 | [diff] [blame] | 4554 | |
Steven Rostedt | 2aad1b7 | 2009-03-30 11:11:28 -0400 | [diff] [blame] | 4555 | out: |
Steven Rostedt | e6ea44e | 2009-02-14 01:42:44 -0500 | [diff] [blame] | 4556 | mutex_unlock(&ftrace_lock); |
Frederic Weisbecker | 15e6cb3 | 2008-11-11 07:14:25 +0100 | [diff] [blame] | 4557 | } |
Frederic Weisbecker | f201ae2 | 2008-11-23 06:22:56 +0100 | [diff] [blame] | 4558 | |
Steven Rostedt | 868baf0 | 2011-02-10 21:26:13 -0500 | [diff] [blame] | 4559 | static DEFINE_PER_CPU(struct ftrace_ret_stack *, idle_ret_stack); |
| 4560 | |
| 4561 | static void |
| 4562 | graph_init_task(struct task_struct *t, struct ftrace_ret_stack *ret_stack) |
| 4563 | { |
| 4564 | atomic_set(&t->tracing_graph_pause, 0); |
| 4565 | atomic_set(&t->trace_overrun, 0); |
| 4566 | t->ftrace_timestamp = 0; |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 4567 | /* make curr_ret_stack visible before we add the ret_stack */ |
Steven Rostedt | 868baf0 | 2011-02-10 21:26:13 -0500 | [diff] [blame] | 4568 | smp_wmb(); |
| 4569 | t->ret_stack = ret_stack; |
| 4570 | } |
| 4571 | |
| 4572 | /* |
| 4573 | * Allocate a return stack for the idle task. May be the first |
| 4574 | * time through, or it may be done by CPU hotplug online. |
| 4575 | */ |
| 4576 | void ftrace_graph_init_idle_task(struct task_struct *t, int cpu) |
| 4577 | { |
| 4578 | t->curr_ret_stack = -1; |
| 4579 | /* |
| 4580 | * The idle task has no parent, it either has its own |
| 4581 | * stack or no stack at all. |
| 4582 | */ |
| 4583 | if (t->ret_stack) |
| 4584 | WARN_ON(t->ret_stack != per_cpu(idle_ret_stack, cpu)); |
| 4585 | |
| 4586 | if (ftrace_graph_active) { |
| 4587 | struct ftrace_ret_stack *ret_stack; |
| 4588 | |
| 4589 | ret_stack = per_cpu(idle_ret_stack, cpu); |
| 4590 | if (!ret_stack) { |
| 4591 | ret_stack = kmalloc(FTRACE_RETFUNC_DEPTH |
| 4592 | * sizeof(struct ftrace_ret_stack), |
| 4593 | GFP_KERNEL); |
| 4594 | if (!ret_stack) |
| 4595 | return; |
| 4596 | per_cpu(idle_ret_stack, cpu) = ret_stack; |
| 4597 | } |
| 4598 | graph_init_task(t, ret_stack); |
| 4599 | } |
| 4600 | } |
| 4601 | |
Frederic Weisbecker | f201ae2 | 2008-11-23 06:22:56 +0100 | [diff] [blame] | 4602 | /* Allocate a return stack for newly created task */ |
Frederic Weisbecker | fb52607 | 2008-11-25 21:07:04 +0100 | [diff] [blame] | 4603 | void ftrace_graph_init_task(struct task_struct *t) |
Frederic Weisbecker | f201ae2 | 2008-11-23 06:22:56 +0100 | [diff] [blame] | 4604 | { |
Steven Rostedt | 84047e3 | 2009-06-02 16:51:55 -0400 | [diff] [blame] | 4605 | /* Make sure we do not use the parent ret_stack */ |
| 4606 | t->ret_stack = NULL; |
Steven Rostedt | ea14eb7 | 2010-03-12 19:41:23 -0500 | [diff] [blame] | 4607 | t->curr_ret_stack = -1; |
Steven Rostedt | 84047e3 | 2009-06-02 16:51:55 -0400 | [diff] [blame] | 4608 | |
Steven Rostedt | 597af81 | 2009-04-03 15:24:12 -0400 | [diff] [blame] | 4609 | if (ftrace_graph_active) { |
Steven Rostedt | 82310a3 | 2009-06-02 12:26:07 -0400 | [diff] [blame] | 4610 | struct ftrace_ret_stack *ret_stack; |
| 4611 | |
| 4612 | ret_stack = kmalloc(FTRACE_RETFUNC_DEPTH |
Frederic Weisbecker | f201ae2 | 2008-11-23 06:22:56 +0100 | [diff] [blame] | 4613 | * sizeof(struct ftrace_ret_stack), |
| 4614 | GFP_KERNEL); |
Steven Rostedt | 82310a3 | 2009-06-02 12:26:07 -0400 | [diff] [blame] | 4615 | if (!ret_stack) |
Frederic Weisbecker | f201ae2 | 2008-11-23 06:22:56 +0100 | [diff] [blame] | 4616 | return; |
Steven Rostedt | 868baf0 | 2011-02-10 21:26:13 -0500 | [diff] [blame] | 4617 | graph_init_task(t, ret_stack); |
Steven Rostedt | 84047e3 | 2009-06-02 16:51:55 -0400 | [diff] [blame] | 4618 | } |
Frederic Weisbecker | f201ae2 | 2008-11-23 06:22:56 +0100 | [diff] [blame] | 4619 | } |
| 4620 | |
Frederic Weisbecker | fb52607 | 2008-11-25 21:07:04 +0100 | [diff] [blame] | 4621 | void ftrace_graph_exit_task(struct task_struct *t) |
Frederic Weisbecker | f201ae2 | 2008-11-23 06:22:56 +0100 | [diff] [blame] | 4622 | { |
Frederic Weisbecker | eae849c | 2008-11-23 17:33:12 +0100 | [diff] [blame] | 4623 | struct ftrace_ret_stack *ret_stack = t->ret_stack; |
| 4624 | |
Frederic Weisbecker | f201ae2 | 2008-11-23 06:22:56 +0100 | [diff] [blame] | 4625 | t->ret_stack = NULL; |
Frederic Weisbecker | eae849c | 2008-11-23 17:33:12 +0100 | [diff] [blame] | 4626 | /* NULL must become visible to IRQs before we free it: */ |
| 4627 | barrier(); |
| 4628 | |
| 4629 | kfree(ret_stack); |
Frederic Weisbecker | f201ae2 | 2008-11-23 06:22:56 +0100 | [diff] [blame] | 4630 | } |
Steven Rostedt | 14a866c | 2008-12-02 23:50:02 -0500 | [diff] [blame] | 4631 | |
| 4632 | void ftrace_graph_stop(void) |
| 4633 | { |
| 4634 | ftrace_stop(); |
| 4635 | } |
Frederic Weisbecker | 15e6cb3 | 2008-11-11 07:14:25 +0100 | [diff] [blame] | 4636 | #endif |