Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Heiko Carstens | a53c8fa | 2012-07-20 11:15:04 +0200 | [diff] [blame] | 2 | * Copyright IBM Corp. 2004, 2011 |
Heiko Carstens | d7b250e | 2011-05-26 09:48:24 +0200 | [diff] [blame] | 3 | * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>, |
| 4 | * Holger Smolinski <Holger.Smolinski@de.ibm.com>, |
| 5 | * Thomas Spatzier <tspat@de.ibm.com>, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | * |
| 7 | * This file contains interrupt related functions. |
| 8 | */ |
| 9 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | #include <linux/kernel_stat.h> |
| 11 | #include <linux/interrupt.h> |
| 12 | #include <linux/seq_file.h> |
Heiko Carstens | 55dff52 | 2007-02-05 21:16:44 +0100 | [diff] [blame] | 13 | #include <linux/proc_fs.h> |
| 14 | #include <linux/profile.h> |
Heiko Carstens | d7b250e | 2011-05-26 09:48:24 +0200 | [diff] [blame] | 15 | #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 Gleixner | 257ceab | 2014-03-04 23:57:29 +0100 | [diff] [blame] | 21 | #include <linux/irq.h> |
Heiko Carstens | d7b250e | 2011-05-26 09:48:24 +0200 | [diff] [blame] | 22 | #include <asm/irq_regs.h> |
| 23 | #include <asm/cputime.h> |
| 24 | #include <asm/lowcore.h> |
| 25 | #include <asm/irq.h> |
Martin Schwidefsky | 1f44a22 | 2013-06-27 09:01:09 +0200 | [diff] [blame] | 26 | #include <asm/hw_irq.h> |
Heiko Carstens | d7b250e | 2011-05-26 09:48:24 +0200 | [diff] [blame] | 27 | #include "entry.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | |
Heiko Carstens | 420f42e | 2013-01-02 15:18:18 +0100 | [diff] [blame] | 29 | DEFINE_PER_CPU_SHARED_ALIGNED(struct irq_stat, irq_stat); |
| 30 | EXPORT_PER_CPU_SYMBOL_GPL(irq_stat); |
| 31 | |
Heiko Carstens | 052ff46 | 2011-01-05 12:47:28 +0100 | [diff] [blame] | 32 | struct irq_class { |
Hendrik Brueckner | e2213e0 | 2014-07-22 16:58:52 +0200 | [diff] [blame] | 33 | int irq; |
Heiko Carstens | 052ff46 | 2011-01-05 12:47:28 +0100 | [diff] [blame] | 34 | char *name; |
| 35 | char *desc; |
| 36 | }; |
| 37 | |
Heiko Carstens | 420f42e | 2013-01-02 15:18:18 +0100 | [diff] [blame] | 38 | /* |
Masanari Iida | cf2fbdd | 2013-03-16 20:53:05 +0900 | [diff] [blame] | 39 | * The list of "main" irq classes on s390. This is the list of interrupts |
Heiko Carstens | 420f42e | 2013-01-02 15:18:18 +0100 | [diff] [blame] | 40 | * 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 Schwidefsky | 1f44a22 | 2013-06-27 09:01:09 +0200 | [diff] [blame] | 48 | static const struct irq_class irqclass_main_desc[NR_IRQS_BASE] = { |
Hendrik Brueckner | e2213e0 | 2014-07-22 16:58:52 +0200 | [diff] [blame] | 49 | {.irq = EXT_INTERRUPT, .name = "EXT"}, |
| 50 | {.irq = IO_INTERRUPT, .name = "I/O"}, |
| 51 | {.irq = THIN_INTERRUPT, .name = "AIO"}, |
Heiko Carstens | 420f42e | 2013-01-02 15:18:18 +0100 | [diff] [blame] | 52 | }; |
| 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 Carstens | 57fe1b2 | 2015-03-25 08:05:49 +0100 | [diff] [blame] | 59 | static const struct irq_class irqclass_sub_desc[] = { |
Hendrik Brueckner | e2213e0 | 2014-07-22 16:58:52 +0200 | [diff] [blame] | 60 | {.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 Hoppe | 8f933b1 | 2013-04-08 09:52:57 +0200 | [diff] [blame] | 72 | {.irq = IRQEXT_FTP, .name = "FTP", .desc = "[EXT] HMC FTP Service"}, |
Hendrik Brueckner | e2213e0 | 2014-07-22 16:58:52 +0200 | [diff] [blame] | 73 | {.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 Brueckner | e2213e0 | 2014-07-22 16:58:52 +0200 | [diff] [blame] | 81 | {.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 Carstens | 052ff46 | 2011-01-05 12:47:28 +0100 | [diff] [blame] | 91 | }; |
| 92 | |
Martin Schwidefsky | 1f44a22 | 2013-06-27 09:01:09 +0200 | [diff] [blame] | 93 | void __init init_IRQ(void) |
| 94 | { |
Heiko Carstens | 57fe1b2 | 2015-03-25 08:05:49 +0100 | [diff] [blame] | 95 | BUILD_BUG_ON(ARRAY_SIZE(irqclass_sub_desc) != NR_ARCH_IRQS); |
Martin Schwidefsky | 1f44a22 | 2013-06-27 09:01:09 +0200 | [diff] [blame] | 96 | init_cio_interrupts(); |
| 97 | init_airq_interrupts(); |
| 98 | init_ext_interrupts(); |
| 99 | } |
| 100 | |
| 101 | void 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | /* |
| 116 | * show_interrupts is needed by /proc/interrupts. |
| 117 | */ |
| 118 | int show_interrupts(struct seq_file *p, void *v) |
| 119 | { |
Hendrik Brueckner | e2213e0 | 2014-07-22 16:58:52 +0200 | [diff] [blame] | 120 | int index = *(loff_t *) v; |
| 121 | int cpu, irq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | |
Heiko Carstens | 8dd79cb | 2008-05-15 16:52:39 +0200 | [diff] [blame] | 123 | get_online_cpus(); |
Hendrik Brueckner | e2213e0 | 2014-07-22 16:58:52 +0200 | [diff] [blame] | 124 | if (index == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | seq_puts(p, " "); |
Heiko Carstens | 420f42e | 2013-01-02 15:18:18 +0100 | [diff] [blame] | 126 | for_each_online_cpu(cpu) |
| 127 | seq_printf(p, "CPU%d ", cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | seq_putc(p, '\n'); |
| 129 | } |
Sebastian Ott | bb98f39 | 2016-06-02 14:57:17 +0200 | [diff] [blame] | 130 | if (index < NR_IRQS_BASE) { |
Hendrik Brueckner | e2213e0 | 2014-07-22 16:58:52 +0200 | [diff] [blame] | 131 | seq_printf(p, "%s: ", irqclass_main_desc[index].name); |
| 132 | irq = irqclass_main_desc[index].irq; |
Heiko Carstens | 420f42e | 2013-01-02 15:18:18 +0100 | [diff] [blame] | 133 | for_each_online_cpu(cpu) |
Martin Schwidefsky | 1f44a22 | 2013-06-27 09:01:09 +0200 | [diff] [blame] | 134 | seq_printf(p, "%10u ", kstat_irqs_cpu(irq, cpu)); |
Heiko Carstens | 420f42e | 2013-01-02 15:18:18 +0100 | [diff] [blame] | 135 | seq_putc(p, '\n'); |
Martin Schwidefsky | 1f44a22 | 2013-06-27 09:01:09 +0200 | [diff] [blame] | 136 | goto out; |
Heiko Carstens | 420f42e | 2013-01-02 15:18:18 +0100 | [diff] [blame] | 137 | } |
Sebastian Ott | bb98f39 | 2016-06-02 14:57:17 +0200 | [diff] [blame] | 138 | if (index > NR_IRQS_BASE) |
| 139 | goto out; |
| 140 | |
Hendrik Brueckner | e2213e0 | 2014-07-22 16:58:52 +0200 | [diff] [blame] | 141 | 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 Carstens | 420f42e | 2013-01-02 15:18:18 +0100 | [diff] [blame] | 144 | for_each_online_cpu(cpu) |
Martin Schwidefsky | 1f44a22 | 2013-06-27 09:01:09 +0200 | [diff] [blame] | 145 | seq_printf(p, "%10u ", |
| 146 | per_cpu(irq_stat, cpu).irqs[irq]); |
Hendrik Brueckner | e2213e0 | 2014-07-22 16:58:52 +0200 | [diff] [blame] | 147 | if (irqclass_sub_desc[index].desc) |
| 148 | seq_printf(p, " %s", irqclass_sub_desc[index].desc); |
Heiko Carstens | 420f42e | 2013-01-02 15:18:18 +0100 | [diff] [blame] | 149 | seq_putc(p, '\n'); |
| 150 | } |
Martin Schwidefsky | 1f44a22 | 2013-06-27 09:01:09 +0200 | [diff] [blame] | 151 | out: |
Heiko Carstens | 8dd79cb | 2008-05-15 16:52:39 +0200 | [diff] [blame] | 152 | put_online_cpus(); |
Heiko Carstens | 420f42e | 2013-01-02 15:18:18 +0100 | [diff] [blame] | 153 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | } |
| 155 | |
Thomas Gleixner | be40340 | 2014-05-07 15:44:20 +0000 | [diff] [blame] | 156 | unsigned int arch_dynirq_lower_bound(unsigned int from) |
| 157 | { |
Sebastian Ott | afaa7d2 | 2014-11-14 11:01:37 +0100 | [diff] [blame] | 158 | return from < NR_IRQS_BASE ? NR_IRQS_BASE : from; |
Thomas Gleixner | be40340 | 2014-05-07 15:44:20 +0000 | [diff] [blame] | 159 | } |
| 160 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | * Switch to the asynchronous interrupt stack for softirq execution. |
| 163 | */ |
Frederic Weisbecker | 7d65f4a | 2013-09-05 15:49:45 +0200 | [diff] [blame] | 164 | void do_softirq_own_stack(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | { |
Frederic Weisbecker | 7d65f4a | 2013-09-05 15:49:45 +0200 | [diff] [blame] | 166 | unsigned long old, new; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | |
Heiko Carstens | 76737ce | 2016-01-31 17:06:16 +0100 | [diff] [blame] | 168 | old = current_stack_pointer(); |
Frederic Weisbecker | 7d65f4a | 2013-09-05 15:49:45 +0200 | [diff] [blame] | 169 | /* 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | } |
Heiko Carstens | 55dff52 | 2007-02-05 21:16:44 +0100 | [diff] [blame] | 187 | |
Heiko Carstens | d7b250e | 2011-05-26 09:48:24 +0200 | [diff] [blame] | 188 | /* |
Jan Glauber | 89c9b66 | 2011-07-24 10:48:27 +0200 | [diff] [blame] | 189 | * ext_int_hash[index] is the list head for all external interrupts that hash |
| 190 | * to this index. |
Heiko Carstens | d7b250e | 2011-05-26 09:48:24 +0200 | [diff] [blame] | 191 | */ |
Heiko Carstens | 9e75c627 | 2013-09-09 07:44:43 +0200 | [diff] [blame] | 192 | static struct hlist_head ext_int_hash[32] ____cacheline_aligned; |
Heiko Carstens | d7b250e | 2011-05-26 09:48:24 +0200 | [diff] [blame] | 193 | |
| 194 | struct ext_int_info { |
Heiko Carstens | d7b250e | 2011-05-26 09:48:24 +0200 | [diff] [blame] | 195 | ext_int_handler_t handler; |
Heiko Carstens | 50ce749 | 2013-09-03 14:12:07 +0200 | [diff] [blame] | 196 | struct hlist_node entry; |
Jan Glauber | 89c9b66 | 2011-07-24 10:48:27 +0200 | [diff] [blame] | 197 | struct rcu_head rcu; |
Heiko Carstens | 50ce749 | 2013-09-03 14:12:07 +0200 | [diff] [blame] | 198 | u16 code; |
Heiko Carstens | d7b250e | 2011-05-26 09:48:24 +0200 | [diff] [blame] | 199 | }; |
| 200 | |
Jan Glauber | 89c9b66 | 2011-07-24 10:48:27 +0200 | [diff] [blame] | 201 | /* ext_int_hash_lock protects the handler lists for external interrupts */ |
Heiko Carstens | 63df41d6 | 2013-09-06 19:10:48 +0200 | [diff] [blame] | 202 | static DEFINE_SPINLOCK(ext_int_hash_lock); |
Jan Glauber | 89c9b66 | 2011-07-24 10:48:27 +0200 | [diff] [blame] | 203 | |
Heiko Carstens | d7b250e | 2011-05-26 09:48:24 +0200 | [diff] [blame] | 204 | static inline int ext_hash(u16 code) |
| 205 | { |
Heiko Carstens | 9e75c627 | 2013-09-09 07:44:43 +0200 | [diff] [blame] | 206 | 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 Carstens | d7b250e | 2011-05-26 09:48:24 +0200 | [diff] [blame] | 209 | } |
| 210 | |
Thomas Huth | 1dad093 | 2014-03-31 15:24:08 +0200 | [diff] [blame] | 211 | int register_external_irq(u16 code, ext_int_handler_t handler) |
Heiko Carstens | d7b250e | 2011-05-26 09:48:24 +0200 | [diff] [blame] | 212 | { |
| 213 | struct ext_int_info *p; |
Jan Glauber | 89c9b66 | 2011-07-24 10:48:27 +0200 | [diff] [blame] | 214 | unsigned long flags; |
Heiko Carstens | d7b250e | 2011-05-26 09:48:24 +0200 | [diff] [blame] | 215 | 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 Glauber | 89c9b66 | 2011-07-24 10:48:27 +0200 | [diff] [blame] | 223 | |
| 224 | spin_lock_irqsave(&ext_int_hash_lock, flags); |
Heiko Carstens | 50ce749 | 2013-09-03 14:12:07 +0200 | [diff] [blame] | 225 | hlist_add_head_rcu(&p->entry, &ext_int_hash[index]); |
Jan Glauber | 89c9b66 | 2011-07-24 10:48:27 +0200 | [diff] [blame] | 226 | spin_unlock_irqrestore(&ext_int_hash_lock, flags); |
Heiko Carstens | d7b250e | 2011-05-26 09:48:24 +0200 | [diff] [blame] | 227 | return 0; |
| 228 | } |
Thomas Huth | 1dad093 | 2014-03-31 15:24:08 +0200 | [diff] [blame] | 229 | EXPORT_SYMBOL(register_external_irq); |
Heiko Carstens | d7b250e | 2011-05-26 09:48:24 +0200 | [diff] [blame] | 230 | |
Thomas Huth | 1dad093 | 2014-03-31 15:24:08 +0200 | [diff] [blame] | 231 | int unregister_external_irq(u16 code, ext_int_handler_t handler) |
Heiko Carstens | d7b250e | 2011-05-26 09:48:24 +0200 | [diff] [blame] | 232 | { |
Jan Glauber | 89c9b66 | 2011-07-24 10:48:27 +0200 | [diff] [blame] | 233 | struct ext_int_info *p; |
| 234 | unsigned long flags; |
| 235 | int index = ext_hash(code); |
Heiko Carstens | d7b250e | 2011-05-26 09:48:24 +0200 | [diff] [blame] | 236 | |
Jan Glauber | 89c9b66 | 2011-07-24 10:48:27 +0200 | [diff] [blame] | 237 | spin_lock_irqsave(&ext_int_hash_lock, flags); |
Heiko Carstens | 50ce749 | 2013-09-03 14:12:07 +0200 | [diff] [blame] | 238 | hlist_for_each_entry_rcu(p, &ext_int_hash[index], entry) { |
Jan Glauber | 89c9b66 | 2011-07-24 10:48:27 +0200 | [diff] [blame] | 239 | if (p->code == code && p->handler == handler) { |
Heiko Carstens | 50ce749 | 2013-09-03 14:12:07 +0200 | [diff] [blame] | 240 | hlist_del_rcu(&p->entry); |
Paul E. McKenney | bc399d6 | 2012-01-06 16:59:51 -0800 | [diff] [blame] | 241 | kfree_rcu(p, rcu); |
Jan Glauber | 89c9b66 | 2011-07-24 10:48:27 +0200 | [diff] [blame] | 242 | } |
Heiko Carstens | 7968ca8 | 2012-04-11 14:28:09 +0200 | [diff] [blame] | 243 | } |
Jan Glauber | 89c9b66 | 2011-07-24 10:48:27 +0200 | [diff] [blame] | 244 | spin_unlock_irqrestore(&ext_int_hash_lock, flags); |
Heiko Carstens | d7b250e | 2011-05-26 09:48:24 +0200 | [diff] [blame] | 245 | return 0; |
| 246 | } |
Thomas Huth | 1dad093 | 2014-03-31 15:24:08 +0200 | [diff] [blame] | 247 | EXPORT_SYMBOL(unregister_external_irq); |
Heiko Carstens | d7b250e | 2011-05-26 09:48:24 +0200 | [diff] [blame] | 248 | |
Martin Schwidefsky | 1f44a22 | 2013-06-27 09:01:09 +0200 | [diff] [blame] | 249 | static irqreturn_t do_ext_interrupt(int irq, void *dummy) |
Heiko Carstens | d7b250e | 2011-05-26 09:48:24 +0200 | [diff] [blame] | 250 | { |
Martin Schwidefsky | 1f44a22 | 2013-06-27 09:01:09 +0200 | [diff] [blame] | 251 | struct pt_regs *regs = get_irq_regs(); |
Martin Schwidefsky | 48f6b00 | 2013-06-17 14:54:02 +0200 | [diff] [blame] | 252 | struct ext_code ext_code; |
Heiko Carstens | d7b250e | 2011-05-26 09:48:24 +0200 | [diff] [blame] | 253 | struct ext_int_info *p; |
| 254 | int index; |
| 255 | |
Martin Schwidefsky | 48f6b00 | 2013-06-17 14:54:02 +0200 | [diff] [blame] | 256 | ext_code = *(struct ext_code *) ®s->int_code; |
Thomas Huth | 1dad093 | 2014-03-31 15:24:08 +0200 | [diff] [blame] | 257 | if (ext_code.code != EXT_IRQ_CLK_COMP) |
Martin Schwidefsky | fe0f497 | 2014-09-30 17:37:52 +0200 | [diff] [blame] | 258 | set_cpu_flag(CIF_NOHZ_DELAY); |
Jan Glauber | 89c9b66 | 2011-07-24 10:48:27 +0200 | [diff] [blame] | 259 | |
Heiko Carstens | fde15c3 | 2012-03-11 11:59:31 -0400 | [diff] [blame] | 260 | index = ext_hash(ext_code.code); |
Jan Glauber | 89c9b66 | 2011-07-24 10:48:27 +0200 | [diff] [blame] | 261 | rcu_read_lock(); |
Heiko Carstens | 50ce749 | 2013-09-03 14:12:07 +0200 | [diff] [blame] | 262 | 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 Glauber | 89c9b66 | 2011-07-24 10:48:27 +0200 | [diff] [blame] | 267 | rcu_read_unlock(); |
Martin Schwidefsky | 1f44a22 | 2013-06-27 09:01:09 +0200 | [diff] [blame] | 268 | return IRQ_HANDLED; |
Heiko Carstens | d7b250e | 2011-05-26 09:48:24 +0200 | [diff] [blame] | 269 | } |
| 270 | |
Martin Schwidefsky | 1f44a22 | 2013-06-27 09:01:09 +0200 | [diff] [blame] | 271 | static struct irqaction external_interrupt = { |
| 272 | .name = "EXT", |
| 273 | .handler = do_ext_interrupt, |
| 274 | }; |
| 275 | |
| 276 | void __init init_ext_interrupts(void) |
Jan Glauber | 89c9b66 | 2011-07-24 10:48:27 +0200 | [diff] [blame] | 277 | { |
Martin Schwidefsky | 1f44a22 | 2013-06-27 09:01:09 +0200 | [diff] [blame] | 278 | int idx; |
| 279 | |
| 280 | for (idx = 0; idx < ARRAY_SIZE(ext_int_hash); idx++) |
Heiko Carstens | 50ce749 | 2013-09-03 14:12:07 +0200 | [diff] [blame] | 281 | INIT_HLIST_HEAD(&ext_int_hash[idx]); |
Martin Schwidefsky | 1f44a22 | 2013-06-27 09:01:09 +0200 | [diff] [blame] | 282 | |
| 283 | irq_set_chip_and_handler(EXT_INTERRUPT, |
| 284 | &dummy_irq_chip, handle_percpu_irq); |
| 285 | setup_irq(EXT_INTERRUPT, &external_interrupt); |
Jan Glauber | 89c9b66 | 2011-07-24 10:48:27 +0200 | [diff] [blame] | 286 | } |
| 287 | |
Heiko Carstens | 82003c3 | 2013-09-04 13:35:45 +0200 | [diff] [blame] | 288 | static DEFINE_SPINLOCK(irq_subclass_lock); |
| 289 | static unsigned char irq_subclass_refcount[64]; |
Heiko Carstens | d7b250e | 2011-05-26 09:48:24 +0200 | [diff] [blame] | 290 | |
Heiko Carstens | 82003c3 | 2013-09-04 13:35:45 +0200 | [diff] [blame] | 291 | void irq_subclass_register(enum irq_subclass subclass) |
Heiko Carstens | d7b250e | 2011-05-26 09:48:24 +0200 | [diff] [blame] | 292 | { |
Heiko Carstens | 82003c3 | 2013-09-04 13:35:45 +0200 | [diff] [blame] | 293 | 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 Carstens | d7b250e | 2011-05-26 09:48:24 +0200 | [diff] [blame] | 298 | } |
Heiko Carstens | 82003c3 | 2013-09-04 13:35:45 +0200 | [diff] [blame] | 299 | EXPORT_SYMBOL(irq_subclass_register); |
Heiko Carstens | d7b250e | 2011-05-26 09:48:24 +0200 | [diff] [blame] | 300 | |
Heiko Carstens | 82003c3 | 2013-09-04 13:35:45 +0200 | [diff] [blame] | 301 | void irq_subclass_unregister(enum irq_subclass subclass) |
Heiko Carstens | d7b250e | 2011-05-26 09:48:24 +0200 | [diff] [blame] | 302 | { |
Heiko Carstens | 82003c3 | 2013-09-04 13:35:45 +0200 | [diff] [blame] | 303 | 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 Carstens | d7b250e | 2011-05-26 09:48:24 +0200 | [diff] [blame] | 308 | } |
Heiko Carstens | 82003c3 | 2013-09-04 13:35:45 +0200 | [diff] [blame] | 309 | EXPORT_SYMBOL(irq_subclass_unregister); |