blob: 285d6561076d2edd780ab788ceccc000cc2c46ea [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Heiko Carstensa53c8fa2012-07-20 11:15:04 +02002 * Copyright IBM Corp. 2004, 2011
Heiko Carstensd7b250e2011-05-26 09:48:24 +02003 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>,
4 * Holger Smolinski <Holger.Smolinski@de.ibm.com>,
5 * Thomas Spatzier <tspat@de.ibm.com>,
Linus Torvalds1da177e2005-04-16 15:20:36 -07006 *
7 * This file contains interrupt related functions.
8 */
9
Linus Torvalds1da177e2005-04-16 15:20:36 -070010#include <linux/kernel_stat.h>
11#include <linux/interrupt.h>
12#include <linux/seq_file.h>
Heiko Carstens55dff522007-02-05 21:16:44 +010013#include <linux/proc_fs.h>
14#include <linux/profile.h>
Heiko Carstensd7b250e2011-05-26 09:48:24 +020015#include <linux/module.h>
16#include <linux/kernel.h>
17#include <linux/ftrace.h>
18#include <linux/errno.h>
19#include <linux/slab.h>
20#include <linux/cpu.h>
Thomas Gleixner257ceab2014-03-04 23:57:29 +010021#include <linux/irq.h>
Heiko Carstensd7b250e2011-05-26 09:48:24 +020022#include <asm/irq_regs.h>
23#include <asm/cputime.h>
24#include <asm/lowcore.h>
25#include <asm/irq.h>
Martin Schwidefsky1f44a222013-06-27 09:01:09 +020026#include <asm/hw_irq.h>
Heiko Carstensd7b250e2011-05-26 09:48:24 +020027#include "entry.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070028
Heiko Carstens420f42e2013-01-02 15:18:18 +010029DEFINE_PER_CPU_SHARED_ALIGNED(struct irq_stat, irq_stat);
30EXPORT_PER_CPU_SYMBOL_GPL(irq_stat);
31
Heiko Carstens052ff462011-01-05 12:47:28 +010032struct irq_class {
Hendrik Bruecknere2213e02014-07-22 16:58:52 +020033 int irq;
Heiko Carstens052ff462011-01-05 12:47:28 +010034 char *name;
35 char *desc;
36};
37
Heiko Carstens420f42e2013-01-02 15:18:18 +010038/*
Masanari Iidacf2fbdd2013-03-16 20:53:05 +090039 * The list of "main" irq classes on s390. This is the list of interrupts
Heiko Carstens420f42e2013-01-02 15:18:18 +010040 * that appear both in /proc/stat ("intr" line) and /proc/interrupts.
41 * Historically only external and I/O interrupts have been part of /proc/stat.
42 * We can't add the split external and I/O sub classes since the first field
43 * in the "intr" line in /proc/stat is supposed to be the sum of all other
44 * fields.
45 * Since the external and I/O interrupt fields are already sums we would end
46 * up with having a sum which accounts each interrupt twice.
47 */
Martin Schwidefsky1f44a222013-06-27 09:01:09 +020048static const struct irq_class irqclass_main_desc[NR_IRQS_BASE] = {
Hendrik Bruecknere2213e02014-07-22 16:58:52 +020049 {.irq = EXT_INTERRUPT, .name = "EXT"},
50 {.irq = IO_INTERRUPT, .name = "I/O"},
51 {.irq = THIN_INTERRUPT, .name = "AIO"},
Heiko Carstens420f42e2013-01-02 15:18:18 +010052};
53
54/*
55 * The list of split external and I/O interrupts that appear only in
56 * /proc/interrupts.
57 * In addition this list contains non external / I/O events like NMIs.
58 */
Heiko Carstens57fe1b22015-03-25 08:05:49 +010059static const struct irq_class irqclass_sub_desc[] = {
Hendrik Bruecknere2213e02014-07-22 16:58:52 +020060 {.irq = IRQEXT_CLK, .name = "CLK", .desc = "[EXT] Clock Comparator"},
61 {.irq = IRQEXT_EXC, .name = "EXC", .desc = "[EXT] External Call"},
62 {.irq = IRQEXT_EMS, .name = "EMS", .desc = "[EXT] Emergency Signal"},
63 {.irq = IRQEXT_TMR, .name = "TMR", .desc = "[EXT] CPU Timer"},
64 {.irq = IRQEXT_TLA, .name = "TAL", .desc = "[EXT] Timing Alert"},
65 {.irq = IRQEXT_PFL, .name = "PFL", .desc = "[EXT] Pseudo Page Fault"},
66 {.irq = IRQEXT_DSD, .name = "DSD", .desc = "[EXT] DASD Diag"},
67 {.irq = IRQEXT_VRT, .name = "VRT", .desc = "[EXT] Virtio"},
68 {.irq = IRQEXT_SCP, .name = "SCP", .desc = "[EXT] Service Call"},
69 {.irq = IRQEXT_IUC, .name = "IUC", .desc = "[EXT] IUCV"},
70 {.irq = IRQEXT_CMS, .name = "CMS", .desc = "[EXT] CPU-Measurement: Sampling"},
71 {.irq = IRQEXT_CMC, .name = "CMC", .desc = "[EXT] CPU-Measurement: Counter"},
Ralf Hoppe8f933b12013-04-08 09:52:57 +020072 {.irq = IRQEXT_FTP, .name = "FTP", .desc = "[EXT] HMC FTP Service"},
Hendrik Bruecknere2213e02014-07-22 16:58:52 +020073 {.irq = IRQIO_CIO, .name = "CIO", .desc = "[I/O] Common I/O Layer Interrupt"},
74 {.irq = IRQIO_QAI, .name = "QAI", .desc = "[I/O] QDIO Adapter Interrupt"},
75 {.irq = IRQIO_DAS, .name = "DAS", .desc = "[I/O] DASD"},
76 {.irq = IRQIO_C15, .name = "C15", .desc = "[I/O] 3215"},
77 {.irq = IRQIO_C70, .name = "C70", .desc = "[I/O] 3270"},
78 {.irq = IRQIO_TAP, .name = "TAP", .desc = "[I/O] Tape"},
79 {.irq = IRQIO_VMR, .name = "VMR", .desc = "[I/O] Unit Record Devices"},
80 {.irq = IRQIO_LCS, .name = "LCS", .desc = "[I/O] LCS"},
Hendrik Bruecknere2213e02014-07-22 16:58:52 +020081 {.irq = IRQIO_CTC, .name = "CTC", .desc = "[I/O] CTC"},
82 {.irq = IRQIO_APB, .name = "APB", .desc = "[I/O] AP Bus"},
83 {.irq = IRQIO_ADM, .name = "ADM", .desc = "[I/O] EADM Subchannel"},
84 {.irq = IRQIO_CSC, .name = "CSC", .desc = "[I/O] CHSC Subchannel"},
85 {.irq = IRQIO_PCI, .name = "PCI", .desc = "[I/O] PCI Interrupt" },
86 {.irq = IRQIO_MSI, .name = "MSI", .desc = "[I/O] MSI Interrupt" },
87 {.irq = IRQIO_VIR, .name = "VIR", .desc = "[I/O] Virtual I/O Devices"},
88 {.irq = IRQIO_VAI, .name = "VAI", .desc = "[I/O] Virtual I/O Devices AI"},
89 {.irq = NMI_NMI, .name = "NMI", .desc = "[NMI] Machine Check"},
90 {.irq = CPU_RST, .name = "RST", .desc = "[CPU] CPU Restart"},
Heiko Carstens052ff462011-01-05 12:47:28 +010091};
92
Martin Schwidefsky1f44a222013-06-27 09:01:09 +020093void __init init_IRQ(void)
94{
Heiko Carstens57fe1b22015-03-25 08:05:49 +010095 BUILD_BUG_ON(ARRAY_SIZE(irqclass_sub_desc) != NR_ARCH_IRQS);
Martin Schwidefsky1f44a222013-06-27 09:01:09 +020096 init_cio_interrupts();
97 init_airq_interrupts();
98 init_ext_interrupts();
99}
100
101void do_IRQ(struct pt_regs *regs, int irq)
102{
103 struct pt_regs *old_regs;
104
105 old_regs = set_irq_regs(regs);
106 irq_enter();
107 if (S390_lowcore.int_clock >= S390_lowcore.clock_comparator)
108 /* Serve timer interrupts first. */
109 clock_comparator_work();
110 generic_handle_irq(irq);
111 irq_exit();
112 set_irq_regs(old_regs);
113}
114
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115/*
116 * show_interrupts is needed by /proc/interrupts.
117 */
118int show_interrupts(struct seq_file *p, void *v)
119{
Hendrik Bruecknere2213e02014-07-22 16:58:52 +0200120 int index = *(loff_t *) v;
121 int cpu, irq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122
Heiko Carstens8dd79cb2008-05-15 16:52:39 +0200123 get_online_cpus();
Hendrik Bruecknere2213e02014-07-22 16:58:52 +0200124 if (index == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125 seq_puts(p, " ");
Heiko Carstens420f42e2013-01-02 15:18:18 +0100126 for_each_online_cpu(cpu)
127 seq_printf(p, "CPU%d ", cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 seq_putc(p, '\n');
129 }
Sebastian Ottbb98f392016-06-02 14:57:17 +0200130 if (index < NR_IRQS_BASE) {
Hendrik Bruecknere2213e02014-07-22 16:58:52 +0200131 seq_printf(p, "%s: ", irqclass_main_desc[index].name);
132 irq = irqclass_main_desc[index].irq;
Heiko Carstens420f42e2013-01-02 15:18:18 +0100133 for_each_online_cpu(cpu)
Martin Schwidefsky1f44a222013-06-27 09:01:09 +0200134 seq_printf(p, "%10u ", kstat_irqs_cpu(irq, cpu));
Heiko Carstens420f42e2013-01-02 15:18:18 +0100135 seq_putc(p, '\n');
Martin Schwidefsky1f44a222013-06-27 09:01:09 +0200136 goto out;
Heiko Carstens420f42e2013-01-02 15:18:18 +0100137 }
Sebastian Ottbb98f392016-06-02 14:57:17 +0200138 if (index > NR_IRQS_BASE)
139 goto out;
140
Hendrik Bruecknere2213e02014-07-22 16:58:52 +0200141 for (index = 0; index < NR_ARCH_IRQS; index++) {
142 seq_printf(p, "%s: ", irqclass_sub_desc[index].name);
143 irq = irqclass_sub_desc[index].irq;
Heiko Carstens420f42e2013-01-02 15:18:18 +0100144 for_each_online_cpu(cpu)
Martin Schwidefsky1f44a222013-06-27 09:01:09 +0200145 seq_printf(p, "%10u ",
146 per_cpu(irq_stat, cpu).irqs[irq]);
Hendrik Bruecknere2213e02014-07-22 16:58:52 +0200147 if (irqclass_sub_desc[index].desc)
148 seq_printf(p, " %s", irqclass_sub_desc[index].desc);
Heiko Carstens420f42e2013-01-02 15:18:18 +0100149 seq_putc(p, '\n');
150 }
Martin Schwidefsky1f44a222013-06-27 09:01:09 +0200151out:
Heiko Carstens8dd79cb2008-05-15 16:52:39 +0200152 put_online_cpus();
Heiko Carstens420f42e2013-01-02 15:18:18 +0100153 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154}
155
Thomas Gleixnerbe403402014-05-07 15:44:20 +0000156unsigned int arch_dynirq_lower_bound(unsigned int from)
157{
Sebastian Ottafaa7d22014-11-14 11:01:37 +0100158 return from < NR_IRQS_BASE ? NR_IRQS_BASE : from;
Thomas Gleixnerbe403402014-05-07 15:44:20 +0000159}
160
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 * Switch to the asynchronous interrupt stack for softirq execution.
163 */
Frederic Weisbecker7d65f4a2013-09-05 15:49:45 +0200164void do_softirq_own_stack(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165{
Frederic Weisbecker7d65f4a2013-09-05 15:49:45 +0200166 unsigned long old, new;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167
Heiko Carstens76737ce2016-01-31 17:06:16 +0100168 old = current_stack_pointer();
Frederic Weisbecker7d65f4a2013-09-05 15:49:45 +0200169 /* Check against async. stack address range. */
170 new = S390_lowcore.async_stack;
171 if (((new - old) >> (PAGE_SHIFT + THREAD_ORDER)) != 0) {
172 /* Need to switch to the async. stack. */
173 new -= STACK_FRAME_OVERHEAD;
174 ((struct stack_frame *) new)->back_chain = old;
175 asm volatile(" la 15,0(%0)\n"
176 " basr 14,%2\n"
177 " la 15,0(%1)\n"
178 : : "a" (new), "a" (old),
179 "a" (__do_softirq)
180 : "0", "1", "2", "3", "4", "5", "14",
181 "cc", "memory" );
182 } else {
183 /* We are already on the async stack. */
184 __do_softirq();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186}
Heiko Carstens55dff522007-02-05 21:16:44 +0100187
Heiko Carstensd7b250e2011-05-26 09:48:24 +0200188/*
Jan Glauber89c9b662011-07-24 10:48:27 +0200189 * ext_int_hash[index] is the list head for all external interrupts that hash
190 * to this index.
Heiko Carstensd7b250e2011-05-26 09:48:24 +0200191 */
Heiko Carstens9e75c6272013-09-09 07:44:43 +0200192static struct hlist_head ext_int_hash[32] ____cacheline_aligned;
Heiko Carstensd7b250e2011-05-26 09:48:24 +0200193
194struct ext_int_info {
Heiko Carstensd7b250e2011-05-26 09:48:24 +0200195 ext_int_handler_t handler;
Heiko Carstens50ce7492013-09-03 14:12:07 +0200196 struct hlist_node entry;
Jan Glauber89c9b662011-07-24 10:48:27 +0200197 struct rcu_head rcu;
Heiko Carstens50ce7492013-09-03 14:12:07 +0200198 u16 code;
Heiko Carstensd7b250e2011-05-26 09:48:24 +0200199};
200
Jan Glauber89c9b662011-07-24 10:48:27 +0200201/* ext_int_hash_lock protects the handler lists for external interrupts */
Heiko Carstens63df41d62013-09-06 19:10:48 +0200202static DEFINE_SPINLOCK(ext_int_hash_lock);
Jan Glauber89c9b662011-07-24 10:48:27 +0200203
Heiko Carstensd7b250e2011-05-26 09:48:24 +0200204static inline int ext_hash(u16 code)
205{
Heiko Carstens9e75c6272013-09-09 07:44:43 +0200206 BUILD_BUG_ON(!is_power_of_2(ARRAY_SIZE(ext_int_hash)));
207
208 return (code + (code >> 9)) & (ARRAY_SIZE(ext_int_hash) - 1);
Heiko Carstensd7b250e2011-05-26 09:48:24 +0200209}
210
Thomas Huth1dad0932014-03-31 15:24:08 +0200211int register_external_irq(u16 code, ext_int_handler_t handler)
Heiko Carstensd7b250e2011-05-26 09:48:24 +0200212{
213 struct ext_int_info *p;
Jan Glauber89c9b662011-07-24 10:48:27 +0200214 unsigned long flags;
Heiko Carstensd7b250e2011-05-26 09:48:24 +0200215 int index;
216
217 p = kmalloc(sizeof(*p), GFP_ATOMIC);
218 if (!p)
219 return -ENOMEM;
220 p->code = code;
221 p->handler = handler;
222 index = ext_hash(code);
Jan Glauber89c9b662011-07-24 10:48:27 +0200223
224 spin_lock_irqsave(&ext_int_hash_lock, flags);
Heiko Carstens50ce7492013-09-03 14:12:07 +0200225 hlist_add_head_rcu(&p->entry, &ext_int_hash[index]);
Jan Glauber89c9b662011-07-24 10:48:27 +0200226 spin_unlock_irqrestore(&ext_int_hash_lock, flags);
Heiko Carstensd7b250e2011-05-26 09:48:24 +0200227 return 0;
228}
Thomas Huth1dad0932014-03-31 15:24:08 +0200229EXPORT_SYMBOL(register_external_irq);
Heiko Carstensd7b250e2011-05-26 09:48:24 +0200230
Thomas Huth1dad0932014-03-31 15:24:08 +0200231int unregister_external_irq(u16 code, ext_int_handler_t handler)
Heiko Carstensd7b250e2011-05-26 09:48:24 +0200232{
Jan Glauber89c9b662011-07-24 10:48:27 +0200233 struct ext_int_info *p;
234 unsigned long flags;
235 int index = ext_hash(code);
Heiko Carstensd7b250e2011-05-26 09:48:24 +0200236
Jan Glauber89c9b662011-07-24 10:48:27 +0200237 spin_lock_irqsave(&ext_int_hash_lock, flags);
Heiko Carstens50ce7492013-09-03 14:12:07 +0200238 hlist_for_each_entry_rcu(p, &ext_int_hash[index], entry) {
Jan Glauber89c9b662011-07-24 10:48:27 +0200239 if (p->code == code && p->handler == handler) {
Heiko Carstens50ce7492013-09-03 14:12:07 +0200240 hlist_del_rcu(&p->entry);
Paul E. McKenneybc399d62012-01-06 16:59:51 -0800241 kfree_rcu(p, rcu);
Jan Glauber89c9b662011-07-24 10:48:27 +0200242 }
Heiko Carstens7968ca82012-04-11 14:28:09 +0200243 }
Jan Glauber89c9b662011-07-24 10:48:27 +0200244 spin_unlock_irqrestore(&ext_int_hash_lock, flags);
Heiko Carstensd7b250e2011-05-26 09:48:24 +0200245 return 0;
246}
Thomas Huth1dad0932014-03-31 15:24:08 +0200247EXPORT_SYMBOL(unregister_external_irq);
Heiko Carstensd7b250e2011-05-26 09:48:24 +0200248
Martin Schwidefsky1f44a222013-06-27 09:01:09 +0200249static irqreturn_t do_ext_interrupt(int irq, void *dummy)
Heiko Carstensd7b250e2011-05-26 09:48:24 +0200250{
Martin Schwidefsky1f44a222013-06-27 09:01:09 +0200251 struct pt_regs *regs = get_irq_regs();
Martin Schwidefsky48f6b002013-06-17 14:54:02 +0200252 struct ext_code ext_code;
Heiko Carstensd7b250e2011-05-26 09:48:24 +0200253 struct ext_int_info *p;
254 int index;
255
Martin Schwidefsky48f6b002013-06-17 14:54:02 +0200256 ext_code = *(struct ext_code *) &regs->int_code;
Thomas Huth1dad0932014-03-31 15:24:08 +0200257 if (ext_code.code != EXT_IRQ_CLK_COMP)
Martin Schwidefskyfe0f4972014-09-30 17:37:52 +0200258 set_cpu_flag(CIF_NOHZ_DELAY);
Jan Glauber89c9b662011-07-24 10:48:27 +0200259
Heiko Carstensfde15c32012-03-11 11:59:31 -0400260 index = ext_hash(ext_code.code);
Jan Glauber89c9b662011-07-24 10:48:27 +0200261 rcu_read_lock();
Heiko Carstens50ce7492013-09-03 14:12:07 +0200262 hlist_for_each_entry_rcu(p, &ext_int_hash[index], entry) {
263 if (unlikely(p->code != ext_code.code))
264 continue;
265 p->handler(ext_code, regs->int_parm, regs->int_parm_long);
266 }
Jan Glauber89c9b662011-07-24 10:48:27 +0200267 rcu_read_unlock();
Martin Schwidefsky1f44a222013-06-27 09:01:09 +0200268 return IRQ_HANDLED;
Heiko Carstensd7b250e2011-05-26 09:48:24 +0200269}
270
Martin Schwidefsky1f44a222013-06-27 09:01:09 +0200271static struct irqaction external_interrupt = {
272 .name = "EXT",
273 .handler = do_ext_interrupt,
274};
275
276void __init init_ext_interrupts(void)
Jan Glauber89c9b662011-07-24 10:48:27 +0200277{
Martin Schwidefsky1f44a222013-06-27 09:01:09 +0200278 int idx;
279
280 for (idx = 0; idx < ARRAY_SIZE(ext_int_hash); idx++)
Heiko Carstens50ce7492013-09-03 14:12:07 +0200281 INIT_HLIST_HEAD(&ext_int_hash[idx]);
Martin Schwidefsky1f44a222013-06-27 09:01:09 +0200282
283 irq_set_chip_and_handler(EXT_INTERRUPT,
284 &dummy_irq_chip, handle_percpu_irq);
285 setup_irq(EXT_INTERRUPT, &external_interrupt);
Jan Glauber89c9b662011-07-24 10:48:27 +0200286}
287
Heiko Carstens82003c32013-09-04 13:35:45 +0200288static DEFINE_SPINLOCK(irq_subclass_lock);
289static unsigned char irq_subclass_refcount[64];
Heiko Carstensd7b250e2011-05-26 09:48:24 +0200290
Heiko Carstens82003c32013-09-04 13:35:45 +0200291void irq_subclass_register(enum irq_subclass subclass)
Heiko Carstensd7b250e2011-05-26 09:48:24 +0200292{
Heiko Carstens82003c32013-09-04 13:35:45 +0200293 spin_lock(&irq_subclass_lock);
294 if (!irq_subclass_refcount[subclass])
295 ctl_set_bit(0, subclass);
296 irq_subclass_refcount[subclass]++;
297 spin_unlock(&irq_subclass_lock);
Heiko Carstensd7b250e2011-05-26 09:48:24 +0200298}
Heiko Carstens82003c32013-09-04 13:35:45 +0200299EXPORT_SYMBOL(irq_subclass_register);
Heiko Carstensd7b250e2011-05-26 09:48:24 +0200300
Heiko Carstens82003c32013-09-04 13:35:45 +0200301void irq_subclass_unregister(enum irq_subclass subclass)
Heiko Carstensd7b250e2011-05-26 09:48:24 +0200302{
Heiko Carstens82003c32013-09-04 13:35:45 +0200303 spin_lock(&irq_subclass_lock);
304 irq_subclass_refcount[subclass]--;
305 if (!irq_subclass_refcount[subclass])
306 ctl_clear_bit(0, subclass);
307 spin_unlock(&irq_subclass_lock);
Heiko Carstensd7b250e2011-05-26 09:48:24 +0200308}
Heiko Carstens82003c32013-09-04 13:35:45 +0200309EXPORT_SYMBOL(irq_subclass_unregister);