Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/kernel/irq/manage.c |
| 3 | * |
Ingo Molnar | a34db9b | 2006-06-29 02:24:50 -0700 | [diff] [blame] | 4 | * Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar |
| 5 | * Copyright (C) 2005-2006 Thomas Gleixner |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | * |
| 7 | * This file contains driver APIs to the irq subsystem. |
| 8 | */ |
| 9 | |
Andrew Morton | 97fd75b | 2012-05-31 16:26:07 -0700 | [diff] [blame] | 10 | #define pr_fmt(fmt) "genirq: " fmt |
| 11 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | #include <linux/irq.h> |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 13 | #include <linux/kthread.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #include <linux/module.h> |
| 15 | #include <linux/random.h> |
| 16 | #include <linux/interrupt.h> |
Robert P. J. Day | 1aeb272 | 2008-04-29 00:59:25 -0700 | [diff] [blame] | 17 | #include <linux/slab.h> |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 18 | #include <linux/sched.h> |
Clark Williams | 8bd75c7 | 2013-02-07 09:47:07 -0600 | [diff] [blame] | 19 | #include <linux/sched/rt.h> |
Oleg Nesterov | 4d1d61a | 2012-05-11 10:59:08 +1000 | [diff] [blame] | 20 | #include <linux/task_work.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | |
| 22 | #include "internals.h" |
| 23 | |
Thomas Gleixner | 8d32a30 | 2011-02-23 23:52:23 +0000 | [diff] [blame] | 24 | #ifdef CONFIG_IRQ_FORCED_THREADING |
| 25 | __read_mostly bool force_irqthreads; |
| 26 | |
| 27 | static int __init setup_forced_irqthreads(char *arg) |
| 28 | { |
| 29 | force_irqthreads = true; |
| 30 | return 0; |
| 31 | } |
| 32 | early_param("threadirqs", setup_forced_irqthreads); |
| 33 | #endif |
| 34 | |
Thomas Gleixner | 18258f7 | 2014-02-15 00:55:18 +0000 | [diff] [blame] | 35 | static void __synchronize_hardirq(struct irq_desc *desc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | { |
Thomas Gleixner | 32f4125 | 2011-03-28 14:10:52 +0200 | [diff] [blame] | 37 | bool inprogress; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | |
Herbert Xu | a98ce5c | 2007-10-23 11:26:25 +0800 | [diff] [blame] | 39 | do { |
| 40 | unsigned long flags; |
| 41 | |
| 42 | /* |
| 43 | * Wait until we're out of the critical section. This might |
| 44 | * give the wrong answer due to the lack of memory barriers. |
| 45 | */ |
Thomas Gleixner | 32f4125 | 2011-03-28 14:10:52 +0200 | [diff] [blame] | 46 | while (irqd_irq_inprogress(&desc->irq_data)) |
Herbert Xu | a98ce5c | 2007-10-23 11:26:25 +0800 | [diff] [blame] | 47 | cpu_relax(); |
| 48 | |
| 49 | /* Ok, that indicated we're done: double-check carefully. */ |
Thomas Gleixner | 239007b | 2009-11-17 16:46:45 +0100 | [diff] [blame] | 50 | raw_spin_lock_irqsave(&desc->lock, flags); |
Thomas Gleixner | 32f4125 | 2011-03-28 14:10:52 +0200 | [diff] [blame] | 51 | inprogress = irqd_irq_inprogress(&desc->irq_data); |
Thomas Gleixner | 239007b | 2009-11-17 16:46:45 +0100 | [diff] [blame] | 52 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
Herbert Xu | a98ce5c | 2007-10-23 11:26:25 +0800 | [diff] [blame] | 53 | |
| 54 | /* Oops, that failed? */ |
Thomas Gleixner | 32f4125 | 2011-03-28 14:10:52 +0200 | [diff] [blame] | 55 | } while (inprogress); |
Thomas Gleixner | 18258f7 | 2014-02-15 00:55:18 +0000 | [diff] [blame] | 56 | } |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 57 | |
Thomas Gleixner | 18258f7 | 2014-02-15 00:55:18 +0000 | [diff] [blame] | 58 | /** |
| 59 | * synchronize_hardirq - wait for pending hard IRQ handlers (on other CPUs) |
| 60 | * @irq: interrupt number to wait for |
| 61 | * |
| 62 | * This function waits for any pending hard IRQ handlers for this |
| 63 | * interrupt to complete before returning. If you use this |
| 64 | * function while holding a resource the IRQ handler may need you |
| 65 | * will deadlock. It does not take associated threaded handlers |
| 66 | * into account. |
| 67 | * |
| 68 | * Do not use this for shutdown scenarios where you must be sure |
| 69 | * that all parts (hardirq and threaded handler) have completed. |
| 70 | * |
Peter Zijlstra | 02cea39 | 2015-02-05 14:06:23 +0100 | [diff] [blame] | 71 | * Returns: false if a threaded handler is active. |
| 72 | * |
Thomas Gleixner | 18258f7 | 2014-02-15 00:55:18 +0000 | [diff] [blame] | 73 | * This function may be called - with care - from IRQ context. |
| 74 | */ |
Peter Zijlstra | 02cea39 | 2015-02-05 14:06:23 +0100 | [diff] [blame] | 75 | bool synchronize_hardirq(unsigned int irq) |
Thomas Gleixner | 18258f7 | 2014-02-15 00:55:18 +0000 | [diff] [blame] | 76 | { |
| 77 | struct irq_desc *desc = irq_to_desc(irq); |
| 78 | |
Peter Zijlstra | 02cea39 | 2015-02-05 14:06:23 +0100 | [diff] [blame] | 79 | if (desc) { |
Thomas Gleixner | 18258f7 | 2014-02-15 00:55:18 +0000 | [diff] [blame] | 80 | __synchronize_hardirq(desc); |
Peter Zijlstra | 02cea39 | 2015-02-05 14:06:23 +0100 | [diff] [blame] | 81 | return !atomic_read(&desc->threads_active); |
| 82 | } |
| 83 | |
| 84 | return true; |
Thomas Gleixner | 18258f7 | 2014-02-15 00:55:18 +0000 | [diff] [blame] | 85 | } |
| 86 | EXPORT_SYMBOL(synchronize_hardirq); |
| 87 | |
| 88 | /** |
| 89 | * synchronize_irq - wait for pending IRQ handlers (on other CPUs) |
| 90 | * @irq: interrupt number to wait for |
| 91 | * |
| 92 | * This function waits for any pending IRQ handlers for this interrupt |
| 93 | * to complete before returning. If you use this function while |
| 94 | * holding a resource the IRQ handler may need you will deadlock. |
| 95 | * |
| 96 | * This function may be called - with care - from IRQ context. |
| 97 | */ |
| 98 | void synchronize_irq(unsigned int irq) |
| 99 | { |
| 100 | struct irq_desc *desc = irq_to_desc(irq); |
| 101 | |
| 102 | if (desc) { |
| 103 | __synchronize_hardirq(desc); |
| 104 | /* |
| 105 | * We made sure that no hardirq handler is |
| 106 | * running. Now verify that no threaded handlers are |
| 107 | * active. |
| 108 | */ |
| 109 | wait_event(desc->wait_for_threads, |
| 110 | !atomic_read(&desc->threads_active)); |
| 111 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | EXPORT_SYMBOL(synchronize_irq); |
| 114 | |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 115 | #ifdef CONFIG_SMP |
| 116 | cpumask_var_t irq_default_affinity; |
| 117 | |
Thomas Gleixner | 9c25558 | 2016-07-04 17:39:23 +0900 | [diff] [blame] | 118 | static bool __irq_can_set_affinity(struct irq_desc *desc) |
Jiang Liu | e019c24 | 2015-06-23 20:29:34 +0200 | [diff] [blame] | 119 | { |
| 120 | if (!desc || !irqd_can_balance(&desc->irq_data) || |
| 121 | !desc->irq_data.chip || !desc->irq_data.chip->irq_set_affinity) |
Thomas Gleixner | 9c25558 | 2016-07-04 17:39:23 +0900 | [diff] [blame] | 122 | return false; |
| 123 | return true; |
Jiang Liu | e019c24 | 2015-06-23 20:29:34 +0200 | [diff] [blame] | 124 | } |
| 125 | |
Thomas Gleixner | 771ee3b | 2007-02-16 01:27:25 -0800 | [diff] [blame] | 126 | /** |
| 127 | * irq_can_set_affinity - Check if the affinity of a given irq can be set |
| 128 | * @irq: Interrupt to check |
| 129 | * |
| 130 | */ |
| 131 | int irq_can_set_affinity(unsigned int irq) |
| 132 | { |
Jiang Liu | e019c24 | 2015-06-23 20:29:34 +0200 | [diff] [blame] | 133 | return __irq_can_set_affinity(irq_to_desc(irq)); |
Thomas Gleixner | 771ee3b | 2007-02-16 01:27:25 -0800 | [diff] [blame] | 134 | } |
| 135 | |
Thomas Gleixner | 591d2fb | 2009-07-21 11:09:39 +0200 | [diff] [blame] | 136 | /** |
Thomas Gleixner | 9c25558 | 2016-07-04 17:39:23 +0900 | [diff] [blame] | 137 | * irq_can_set_affinity_usr - Check if affinity of a irq can be set from user space |
| 138 | * @irq: Interrupt to check |
| 139 | * |
| 140 | * Like irq_can_set_affinity() above, but additionally checks for the |
| 141 | * AFFINITY_MANAGED flag. |
| 142 | */ |
| 143 | bool irq_can_set_affinity_usr(unsigned int irq) |
| 144 | { |
| 145 | struct irq_desc *desc = irq_to_desc(irq); |
| 146 | |
| 147 | return __irq_can_set_affinity(desc) && |
| 148 | !irqd_affinity_is_managed(&desc->irq_data); |
| 149 | } |
| 150 | |
| 151 | /** |
Thomas Gleixner | 591d2fb | 2009-07-21 11:09:39 +0200 | [diff] [blame] | 152 | * irq_set_thread_affinity - Notify irq threads to adjust affinity |
| 153 | * @desc: irq descriptor which has affitnity changed |
| 154 | * |
| 155 | * We just set IRQTF_AFFINITY and delegate the affinity setting |
| 156 | * to the interrupt thread itself. We can not call |
| 157 | * set_cpus_allowed_ptr() here as we hold desc->lock and this |
| 158 | * code can be called from hard interrupt context. |
| 159 | */ |
| 160 | void irq_set_thread_affinity(struct irq_desc *desc) |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 161 | { |
Daniel Lezcano | f944b5a | 2016-01-14 10:54:13 +0100 | [diff] [blame] | 162 | struct irqaction *action; |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 163 | |
Daniel Lezcano | f944b5a | 2016-01-14 10:54:13 +0100 | [diff] [blame] | 164 | for_each_action_of_desc(desc, action) |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 165 | if (action->thread) |
Thomas Gleixner | 591d2fb | 2009-07-21 11:09:39 +0200 | [diff] [blame] | 166 | set_bit(IRQTF_AFFINITY, &action->thread_flags); |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 167 | } |
| 168 | |
Thomas Gleixner | 1fa46f1 | 2011-02-07 16:46:58 +0100 | [diff] [blame] | 169 | #ifdef CONFIG_GENERIC_PENDING_IRQ |
Thomas Gleixner | 0ef5ca1 | 2011-03-28 21:59:37 +0200 | [diff] [blame] | 170 | static inline bool irq_can_move_pcntxt(struct irq_data *data) |
Thomas Gleixner | 1fa46f1 | 2011-02-07 16:46:58 +0100 | [diff] [blame] | 171 | { |
Thomas Gleixner | 0ef5ca1 | 2011-03-28 21:59:37 +0200 | [diff] [blame] | 172 | return irqd_can_move_in_process_context(data); |
Thomas Gleixner | 1fa46f1 | 2011-02-07 16:46:58 +0100 | [diff] [blame] | 173 | } |
Thomas Gleixner | 0ef5ca1 | 2011-03-28 21:59:37 +0200 | [diff] [blame] | 174 | static inline bool irq_move_pending(struct irq_data *data) |
Thomas Gleixner | 1fa46f1 | 2011-02-07 16:46:58 +0100 | [diff] [blame] | 175 | { |
Thomas Gleixner | 0ef5ca1 | 2011-03-28 21:59:37 +0200 | [diff] [blame] | 176 | return irqd_is_setaffinity_pending(data); |
Thomas Gleixner | 1fa46f1 | 2011-02-07 16:46:58 +0100 | [diff] [blame] | 177 | } |
| 178 | static inline void |
| 179 | irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask) |
| 180 | { |
| 181 | cpumask_copy(desc->pending_mask, mask); |
| 182 | } |
| 183 | static inline void |
| 184 | irq_get_pending(struct cpumask *mask, struct irq_desc *desc) |
| 185 | { |
| 186 | cpumask_copy(mask, desc->pending_mask); |
| 187 | } |
| 188 | #else |
Thomas Gleixner | 0ef5ca1 | 2011-03-28 21:59:37 +0200 | [diff] [blame] | 189 | static inline bool irq_can_move_pcntxt(struct irq_data *data) { return true; } |
Thomas Gleixner | cd22c0e | 2011-03-29 11:36:05 +0200 | [diff] [blame] | 190 | static inline bool irq_move_pending(struct irq_data *data) { return false; } |
Thomas Gleixner | 1fa46f1 | 2011-02-07 16:46:58 +0100 | [diff] [blame] | 191 | static inline void |
| 192 | irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask) { } |
| 193 | static inline void |
| 194 | irq_get_pending(struct cpumask *mask, struct irq_desc *desc) { } |
| 195 | #endif |
| 196 | |
Jiang Liu | 818b0f3 | 2012-03-30 23:11:34 +0800 | [diff] [blame] | 197 | int irq_do_set_affinity(struct irq_data *data, const struct cpumask *mask, |
| 198 | bool force) |
| 199 | { |
| 200 | struct irq_desc *desc = irq_data_to_desc(data); |
| 201 | struct irq_chip *chip = irq_data_get_irq_chip(data); |
| 202 | int ret; |
| 203 | |
Thomas Gleixner | 01f8fa4 | 2014-04-16 14:36:44 +0000 | [diff] [blame] | 204 | ret = chip->irq_set_affinity(data, mask, force); |
Jiang Liu | 818b0f3 | 2012-03-30 23:11:34 +0800 | [diff] [blame] | 205 | switch (ret) { |
| 206 | case IRQ_SET_MASK_OK: |
Jiang Liu | 2cb6254 | 2014-11-06 22:20:18 +0800 | [diff] [blame] | 207 | case IRQ_SET_MASK_OK_DONE: |
Jiang Liu | 9df872f | 2015-06-03 11:47:50 +0800 | [diff] [blame] | 208 | cpumask_copy(desc->irq_common_data.affinity, mask); |
Jiang Liu | 818b0f3 | 2012-03-30 23:11:34 +0800 | [diff] [blame] | 209 | case IRQ_SET_MASK_OK_NOCOPY: |
| 210 | irq_set_thread_affinity(desc); |
| 211 | ret = 0; |
| 212 | } |
| 213 | |
| 214 | return ret; |
| 215 | } |
| 216 | |
Thomas Gleixner | 01f8fa4 | 2014-04-16 14:36:44 +0000 | [diff] [blame] | 217 | int irq_set_affinity_locked(struct irq_data *data, const struct cpumask *mask, |
| 218 | bool force) |
David Daney | c2d0c55 | 2011-03-25 12:38:50 -0700 | [diff] [blame] | 219 | { |
| 220 | struct irq_chip *chip = irq_data_get_irq_chip(data); |
| 221 | struct irq_desc *desc = irq_data_to_desc(data); |
| 222 | int ret = 0; |
| 223 | |
| 224 | if (!chip || !chip->irq_set_affinity) |
| 225 | return -EINVAL; |
| 226 | |
Thomas Gleixner | 0ef5ca1 | 2011-03-28 21:59:37 +0200 | [diff] [blame] | 227 | if (irq_can_move_pcntxt(data)) { |
Thomas Gleixner | 01f8fa4 | 2014-04-16 14:36:44 +0000 | [diff] [blame] | 228 | ret = irq_do_set_affinity(data, mask, force); |
David Daney | c2d0c55 | 2011-03-25 12:38:50 -0700 | [diff] [blame] | 229 | } else { |
| 230 | irqd_set_move_pending(data); |
| 231 | irq_copy_pending(desc, mask); |
| 232 | } |
| 233 | |
| 234 | if (desc->affinity_notify) { |
| 235 | kref_get(&desc->affinity_notify->kref); |
| 236 | schedule_work(&desc->affinity_notify->work); |
| 237 | } |
David Daney | c2d0c55 | 2011-03-25 12:38:50 -0700 | [diff] [blame] | 238 | irqd_set(data, IRQD_AFFINITY_SET); |
| 239 | |
| 240 | return ret; |
| 241 | } |
| 242 | |
Thomas Gleixner | 01f8fa4 | 2014-04-16 14:36:44 +0000 | [diff] [blame] | 243 | int __irq_set_affinity(unsigned int irq, const struct cpumask *mask, bool force) |
Thomas Gleixner | 771ee3b | 2007-02-16 01:27:25 -0800 | [diff] [blame] | 244 | { |
Yinghai Lu | 08678b0 | 2008-08-19 20:50:05 -0700 | [diff] [blame] | 245 | struct irq_desc *desc = irq_to_desc(irq); |
Thomas Gleixner | f6d87f4 | 2008-11-07 13:18:30 +0100 | [diff] [blame] | 246 | unsigned long flags; |
David Daney | c2d0c55 | 2011-03-25 12:38:50 -0700 | [diff] [blame] | 247 | int ret; |
Thomas Gleixner | 771ee3b | 2007-02-16 01:27:25 -0800 | [diff] [blame] | 248 | |
David Daney | c2d0c55 | 2011-03-25 12:38:50 -0700 | [diff] [blame] | 249 | if (!desc) |
Thomas Gleixner | 771ee3b | 2007-02-16 01:27:25 -0800 | [diff] [blame] | 250 | return -EINVAL; |
| 251 | |
Thomas Gleixner | 239007b | 2009-11-17 16:46:45 +0100 | [diff] [blame] | 252 | raw_spin_lock_irqsave(&desc->lock, flags); |
Thomas Gleixner | 01f8fa4 | 2014-04-16 14:36:44 +0000 | [diff] [blame] | 253 | ret = irq_set_affinity_locked(irq_desc_get_irq_data(desc), mask, force); |
Thomas Gleixner | 239007b | 2009-11-17 16:46:45 +0100 | [diff] [blame] | 254 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
Thomas Gleixner | 1fa46f1 | 2011-02-07 16:46:58 +0100 | [diff] [blame] | 255 | return ret; |
Thomas Gleixner | 771ee3b | 2007-02-16 01:27:25 -0800 | [diff] [blame] | 256 | } |
| 257 | |
Peter P Waskiewicz Jr | e7a297b | 2010-04-30 14:44:50 -0700 | [diff] [blame] | 258 | int irq_set_affinity_hint(unsigned int irq, const struct cpumask *m) |
| 259 | { |
Peter P Waskiewicz Jr | e7a297b | 2010-04-30 14:44:50 -0700 | [diff] [blame] | 260 | unsigned long flags; |
Marc Zyngier | 31d9d9b | 2011-09-23 17:03:06 +0100 | [diff] [blame] | 261 | struct irq_desc *desc = irq_get_desc_lock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL); |
Peter P Waskiewicz Jr | e7a297b | 2010-04-30 14:44:50 -0700 | [diff] [blame] | 262 | |
| 263 | if (!desc) |
| 264 | return -EINVAL; |
Peter P Waskiewicz Jr | e7a297b | 2010-04-30 14:44:50 -0700 | [diff] [blame] | 265 | desc->affinity_hint = m; |
Thomas Gleixner | 02725e7 | 2011-02-12 10:37:36 +0100 | [diff] [blame] | 266 | irq_put_desc_unlock(desc, flags); |
Jesse Brandeburg | e2e64a9 | 2014-12-18 17:22:06 -0800 | [diff] [blame] | 267 | /* set the initial affinity to prevent every interrupt being on CPU0 */ |
Jesse Brandeburg | 4fe7ffb | 2015-01-28 10:57:39 -0800 | [diff] [blame] | 268 | if (m) |
| 269 | __irq_set_affinity(irq, m, false); |
Peter P Waskiewicz Jr | e7a297b | 2010-04-30 14:44:50 -0700 | [diff] [blame] | 270 | return 0; |
| 271 | } |
| 272 | EXPORT_SYMBOL_GPL(irq_set_affinity_hint); |
| 273 | |
Ben Hutchings | cd7eab4 | 2011-01-19 21:01:44 +0000 | [diff] [blame] | 274 | static void irq_affinity_notify(struct work_struct *work) |
| 275 | { |
| 276 | struct irq_affinity_notify *notify = |
| 277 | container_of(work, struct irq_affinity_notify, work); |
| 278 | struct irq_desc *desc = irq_to_desc(notify->irq); |
| 279 | cpumask_var_t cpumask; |
| 280 | unsigned long flags; |
| 281 | |
Thomas Gleixner | 1fa46f1 | 2011-02-07 16:46:58 +0100 | [diff] [blame] | 282 | if (!desc || !alloc_cpumask_var(&cpumask, GFP_KERNEL)) |
Ben Hutchings | cd7eab4 | 2011-01-19 21:01:44 +0000 | [diff] [blame] | 283 | goto out; |
| 284 | |
| 285 | raw_spin_lock_irqsave(&desc->lock, flags); |
Thomas Gleixner | 0ef5ca1 | 2011-03-28 21:59:37 +0200 | [diff] [blame] | 286 | if (irq_move_pending(&desc->irq_data)) |
Thomas Gleixner | 1fa46f1 | 2011-02-07 16:46:58 +0100 | [diff] [blame] | 287 | irq_get_pending(cpumask, desc); |
Ben Hutchings | cd7eab4 | 2011-01-19 21:01:44 +0000 | [diff] [blame] | 288 | else |
Jiang Liu | 9df872f | 2015-06-03 11:47:50 +0800 | [diff] [blame] | 289 | cpumask_copy(cpumask, desc->irq_common_data.affinity); |
Ben Hutchings | cd7eab4 | 2011-01-19 21:01:44 +0000 | [diff] [blame] | 290 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
| 291 | |
| 292 | notify->notify(notify, cpumask); |
| 293 | |
| 294 | free_cpumask_var(cpumask); |
| 295 | out: |
| 296 | kref_put(¬ify->kref, notify->release); |
| 297 | } |
| 298 | |
| 299 | /** |
| 300 | * irq_set_affinity_notifier - control notification of IRQ affinity changes |
| 301 | * @irq: Interrupt for which to enable/disable notification |
| 302 | * @notify: Context for notification, or %NULL to disable |
| 303 | * notification. Function pointers must be initialised; |
| 304 | * the other fields will be initialised by this function. |
| 305 | * |
| 306 | * Must be called in process context. Notification may only be enabled |
| 307 | * after the IRQ is allocated and must be disabled before the IRQ is |
| 308 | * freed using free_irq(). |
| 309 | */ |
| 310 | int |
| 311 | irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify) |
| 312 | { |
| 313 | struct irq_desc *desc = irq_to_desc(irq); |
| 314 | struct irq_affinity_notify *old_notify; |
| 315 | unsigned long flags; |
| 316 | |
| 317 | /* The release function is promised process context */ |
| 318 | might_sleep(); |
| 319 | |
| 320 | if (!desc) |
| 321 | return -EINVAL; |
| 322 | |
| 323 | /* Complete initialisation of *notify */ |
| 324 | if (notify) { |
| 325 | notify->irq = irq; |
| 326 | kref_init(¬ify->kref); |
| 327 | INIT_WORK(¬ify->work, irq_affinity_notify); |
| 328 | } |
| 329 | |
| 330 | raw_spin_lock_irqsave(&desc->lock, flags); |
| 331 | old_notify = desc->affinity_notify; |
| 332 | desc->affinity_notify = notify; |
| 333 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
| 334 | |
| 335 | if (old_notify) |
| 336 | kref_put(&old_notify->kref, old_notify->release); |
| 337 | |
| 338 | return 0; |
| 339 | } |
| 340 | EXPORT_SYMBOL_GPL(irq_set_affinity_notifier); |
| 341 | |
Max Krasnyansky | 1840475 | 2008-05-29 11:02:52 -0700 | [diff] [blame] | 342 | #ifndef CONFIG_AUTO_IRQ_AFFINITY |
| 343 | /* |
| 344 | * Generic version of the affinity autoselector. |
| 345 | */ |
Jiang Liu | a8a98ea | 2015-06-04 12:13:30 +0800 | [diff] [blame] | 346 | static int setup_affinity(struct irq_desc *desc, struct cpumask *mask) |
Max Krasnyansky | 1840475 | 2008-05-29 11:02:52 -0700 | [diff] [blame] | 347 | { |
Thomas Gleixner | 569bda8 | 2011-02-07 17:05:08 +0100 | [diff] [blame] | 348 | struct cpumask *set = irq_default_affinity; |
Jiang Liu | 6783011 | 2015-06-01 16:05:13 +0800 | [diff] [blame] | 349 | int node = irq_desc_get_node(desc); |
Thomas Gleixner | 569bda8 | 2011-02-07 17:05:08 +0100 | [diff] [blame] | 350 | |
Thomas Gleixner | b008207 | 2011-02-07 17:30:50 +0100 | [diff] [blame] | 351 | /* Excludes PER_CPU and NO_BALANCE interrupts */ |
Jiang Liu | e019c24 | 2015-06-23 20:29:34 +0200 | [diff] [blame] | 352 | if (!__irq_can_set_affinity(desc)) |
Max Krasnyansky | 1840475 | 2008-05-29 11:02:52 -0700 | [diff] [blame] | 353 | return 0; |
| 354 | |
Thomas Gleixner | f6d87f4 | 2008-11-07 13:18:30 +0100 | [diff] [blame] | 355 | /* |
Thomas Gleixner | 06ee6d5 | 2016-07-04 17:39:24 +0900 | [diff] [blame] | 356 | * Preserve the managed affinity setting and an userspace affinity |
| 357 | * setup, but make sure that one of the targets is online. |
Thomas Gleixner | f6d87f4 | 2008-11-07 13:18:30 +0100 | [diff] [blame] | 358 | */ |
Thomas Gleixner | 06ee6d5 | 2016-07-04 17:39:24 +0900 | [diff] [blame] | 359 | if (irqd_affinity_is_managed(&desc->irq_data) || |
| 360 | irqd_has_set(&desc->irq_data, IRQD_AFFINITY_SET)) { |
Jiang Liu | 9df872f | 2015-06-03 11:47:50 +0800 | [diff] [blame] | 361 | if (cpumask_intersects(desc->irq_common_data.affinity, |
Thomas Gleixner | 569bda8 | 2011-02-07 17:05:08 +0100 | [diff] [blame] | 362 | cpu_online_mask)) |
Jiang Liu | 9df872f | 2015-06-03 11:47:50 +0800 | [diff] [blame] | 363 | set = desc->irq_common_data.affinity; |
Thomas Gleixner | 0c6f8a8 | 2011-03-28 13:32:20 +0200 | [diff] [blame] | 364 | else |
Thomas Gleixner | 2bdd105 | 2011-02-08 17:22:00 +0100 | [diff] [blame] | 365 | irqd_clear(&desc->irq_data, IRQD_AFFINITY_SET); |
Thomas Gleixner | f6d87f4 | 2008-11-07 13:18:30 +0100 | [diff] [blame] | 366 | } |
Max Krasnyansky | 1840475 | 2008-05-29 11:02:52 -0700 | [diff] [blame] | 367 | |
Thomas Gleixner | 3b8249e | 2011-02-07 16:02:20 +0100 | [diff] [blame] | 368 | cpumask_and(mask, cpu_online_mask, set); |
Prarit Bhargava | 241fc64 | 2012-03-26 15:02:18 -0400 | [diff] [blame] | 369 | if (node != NUMA_NO_NODE) { |
| 370 | const struct cpumask *nodemask = cpumask_of_node(node); |
| 371 | |
| 372 | /* make sure at least one of the cpus in nodemask is online */ |
| 373 | if (cpumask_intersects(mask, nodemask)) |
| 374 | cpumask_and(mask, mask, nodemask); |
| 375 | } |
Jiang Liu | 818b0f3 | 2012-03-30 23:11:34 +0800 | [diff] [blame] | 376 | irq_do_set_affinity(&desc->irq_data, mask, false); |
Max Krasnyansky | 1840475 | 2008-05-29 11:02:52 -0700 | [diff] [blame] | 377 | return 0; |
| 378 | } |
Thomas Gleixner | f6d87f4 | 2008-11-07 13:18:30 +0100 | [diff] [blame] | 379 | #else |
Jiang Liu | a8a98ea | 2015-06-04 12:13:30 +0800 | [diff] [blame] | 380 | /* Wrapper for ALPHA specific affinity selector magic */ |
| 381 | static inline int setup_affinity(struct irq_desc *d, struct cpumask *mask) |
Thomas Gleixner | f6d87f4 | 2008-11-07 13:18:30 +0100 | [diff] [blame] | 382 | { |
Jiang Liu | a8a98ea | 2015-06-04 12:13:30 +0800 | [diff] [blame] | 383 | return irq_select_affinity(irq_desc_get_irq(d)); |
Thomas Gleixner | f6d87f4 | 2008-11-07 13:18:30 +0100 | [diff] [blame] | 384 | } |
Max Krasnyansky | 1840475 | 2008-05-29 11:02:52 -0700 | [diff] [blame] | 385 | #endif |
| 386 | |
Thomas Gleixner | f6d87f4 | 2008-11-07 13:18:30 +0100 | [diff] [blame] | 387 | /* |
| 388 | * Called when affinity is set via /proc/irq |
| 389 | */ |
Thomas Gleixner | 3b8249e | 2011-02-07 16:02:20 +0100 | [diff] [blame] | 390 | int irq_select_affinity_usr(unsigned int irq, struct cpumask *mask) |
Thomas Gleixner | f6d87f4 | 2008-11-07 13:18:30 +0100 | [diff] [blame] | 391 | { |
| 392 | struct irq_desc *desc = irq_to_desc(irq); |
| 393 | unsigned long flags; |
| 394 | int ret; |
| 395 | |
Thomas Gleixner | 239007b | 2009-11-17 16:46:45 +0100 | [diff] [blame] | 396 | raw_spin_lock_irqsave(&desc->lock, flags); |
Jiang Liu | a8a98ea | 2015-06-04 12:13:30 +0800 | [diff] [blame] | 397 | ret = setup_affinity(desc, mask); |
Thomas Gleixner | 239007b | 2009-11-17 16:46:45 +0100 | [diff] [blame] | 398 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
Thomas Gleixner | f6d87f4 | 2008-11-07 13:18:30 +0100 | [diff] [blame] | 399 | return ret; |
| 400 | } |
| 401 | |
| 402 | #else |
Thomas Gleixner | 3b8249e | 2011-02-07 16:02:20 +0100 | [diff] [blame] | 403 | static inline int |
Jiang Liu | a8a98ea | 2015-06-04 12:13:30 +0800 | [diff] [blame] | 404 | setup_affinity(struct irq_desc *desc, struct cpumask *mask) |
Thomas Gleixner | f6d87f4 | 2008-11-07 13:18:30 +0100 | [diff] [blame] | 405 | { |
| 406 | return 0; |
| 407 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | #endif |
| 409 | |
Feng Wu | fcf1ae2 | 2015-10-03 16:20:38 +0800 | [diff] [blame] | 410 | /** |
| 411 | * irq_set_vcpu_affinity - Set vcpu affinity for the interrupt |
| 412 | * @irq: interrupt number to set affinity |
| 413 | * @vcpu_info: vCPU specific data |
| 414 | * |
| 415 | * This function uses the vCPU specific data to set the vCPU |
| 416 | * affinity for an irq. The vCPU specific data is passed from |
| 417 | * outside, such as KVM. One example code path is as below: |
| 418 | * KVM -> IOMMU -> irq_set_vcpu_affinity(). |
| 419 | */ |
| 420 | int irq_set_vcpu_affinity(unsigned int irq, void *vcpu_info) |
| 421 | { |
| 422 | unsigned long flags; |
| 423 | struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0); |
| 424 | struct irq_data *data; |
| 425 | struct irq_chip *chip; |
| 426 | int ret = -ENOSYS; |
| 427 | |
| 428 | if (!desc) |
| 429 | return -EINVAL; |
| 430 | |
| 431 | data = irq_desc_get_irq_data(desc); |
| 432 | chip = irq_data_get_irq_chip(data); |
| 433 | if (chip && chip->irq_set_vcpu_affinity) |
| 434 | ret = chip->irq_set_vcpu_affinity(data, vcpu_info); |
| 435 | irq_put_desc_unlock(desc, flags); |
| 436 | |
| 437 | return ret; |
| 438 | } |
| 439 | EXPORT_SYMBOL_GPL(irq_set_vcpu_affinity); |
| 440 | |
Jiang Liu | 79ff1cd | 2015-06-23 19:52:36 +0200 | [diff] [blame] | 441 | void __disable_irq(struct irq_desc *desc) |
Rafael J. Wysocki | 0a0c516 | 2009-03-16 22:33:49 +0100 | [diff] [blame] | 442 | { |
Thomas Gleixner | 3aae994 | 2011-02-04 10:17:52 +0100 | [diff] [blame] | 443 | if (!desc->depth++) |
Thomas Gleixner | 8792347 | 2011-02-03 12:27:44 +0100 | [diff] [blame] | 444 | irq_disable(desc); |
Rafael J. Wysocki | 0a0c516 | 2009-03-16 22:33:49 +0100 | [diff] [blame] | 445 | } |
| 446 | |
Thomas Gleixner | 02725e7 | 2011-02-12 10:37:36 +0100 | [diff] [blame] | 447 | static int __disable_irq_nosync(unsigned int irq) |
| 448 | { |
| 449 | unsigned long flags; |
Marc Zyngier | 31d9d9b | 2011-09-23 17:03:06 +0100 | [diff] [blame] | 450 | struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL); |
Thomas Gleixner | 02725e7 | 2011-02-12 10:37:36 +0100 | [diff] [blame] | 451 | |
| 452 | if (!desc) |
| 453 | return -EINVAL; |
Jiang Liu | 79ff1cd | 2015-06-23 19:52:36 +0200 | [diff] [blame] | 454 | __disable_irq(desc); |
Thomas Gleixner | 02725e7 | 2011-02-12 10:37:36 +0100 | [diff] [blame] | 455 | irq_put_desc_busunlock(desc, flags); |
| 456 | return 0; |
| 457 | } |
| 458 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 459 | /** |
| 460 | * disable_irq_nosync - disable an irq without waiting |
| 461 | * @irq: Interrupt to disable |
| 462 | * |
| 463 | * Disable the selected interrupt line. Disables and Enables are |
| 464 | * nested. |
| 465 | * Unlike disable_irq(), this function does not ensure existing |
| 466 | * instances of the IRQ handler have completed before returning. |
| 467 | * |
| 468 | * This function may be called from IRQ context. |
| 469 | */ |
| 470 | void disable_irq_nosync(unsigned int irq) |
| 471 | { |
Thomas Gleixner | 02725e7 | 2011-02-12 10:37:36 +0100 | [diff] [blame] | 472 | __disable_irq_nosync(irq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | EXPORT_SYMBOL(disable_irq_nosync); |
| 475 | |
| 476 | /** |
| 477 | * disable_irq - disable an irq and wait for completion |
| 478 | * @irq: Interrupt to disable |
| 479 | * |
| 480 | * Disable the selected interrupt line. Enables and Disables are |
| 481 | * nested. |
| 482 | * This function waits for any pending IRQ handlers for this interrupt |
| 483 | * to complete before returning. If you use this function while |
| 484 | * holding a resource the IRQ handler may need you will deadlock. |
| 485 | * |
| 486 | * This function may be called - with care - from IRQ context. |
| 487 | */ |
| 488 | void disable_irq(unsigned int irq) |
| 489 | { |
Thomas Gleixner | 02725e7 | 2011-02-12 10:37:36 +0100 | [diff] [blame] | 490 | if (!__disable_irq_nosync(irq)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | synchronize_irq(irq); |
| 492 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 493 | EXPORT_SYMBOL(disable_irq); |
| 494 | |
Peter Zijlstra | 02cea39 | 2015-02-05 14:06:23 +0100 | [diff] [blame] | 495 | /** |
| 496 | * disable_hardirq - disables an irq and waits for hardirq completion |
| 497 | * @irq: Interrupt to disable |
| 498 | * |
| 499 | * Disable the selected interrupt line. Enables and Disables are |
| 500 | * nested. |
| 501 | * This function waits for any pending hard IRQ handlers for this |
| 502 | * interrupt to complete before returning. If you use this function while |
| 503 | * holding a resource the hard IRQ handler may need you will deadlock. |
| 504 | * |
| 505 | * When used to optimistically disable an interrupt from atomic context |
| 506 | * the return value must be checked. |
| 507 | * |
| 508 | * Returns: false if a threaded handler is active. |
| 509 | * |
| 510 | * This function may be called - with care - from IRQ context. |
| 511 | */ |
| 512 | bool disable_hardirq(unsigned int irq) |
| 513 | { |
| 514 | if (!__disable_irq_nosync(irq)) |
| 515 | return synchronize_hardirq(irq); |
| 516 | |
| 517 | return false; |
| 518 | } |
| 519 | EXPORT_SYMBOL_GPL(disable_hardirq); |
| 520 | |
Jiang Liu | 79ff1cd | 2015-06-23 19:52:36 +0200 | [diff] [blame] | 521 | void __enable_irq(struct irq_desc *desc) |
Thomas Gleixner | 1adb085 | 2008-04-28 17:01:56 +0200 | [diff] [blame] | 522 | { |
| 523 | switch (desc->depth) { |
| 524 | case 0: |
Rafael J. Wysocki | 0a0c516 | 2009-03-16 22:33:49 +0100 | [diff] [blame] | 525 | err_out: |
Jiang Liu | 79ff1cd | 2015-06-23 19:52:36 +0200 | [diff] [blame] | 526 | WARN(1, KERN_WARNING "Unbalanced enable for IRQ %d\n", |
| 527 | irq_desc_get_irq(desc)); |
Thomas Gleixner | 1adb085 | 2008-04-28 17:01:56 +0200 | [diff] [blame] | 528 | break; |
| 529 | case 1: { |
Thomas Gleixner | c531e83 | 2011-02-08 12:44:58 +0100 | [diff] [blame] | 530 | if (desc->istate & IRQS_SUSPENDED) |
Rafael J. Wysocki | 0a0c516 | 2009-03-16 22:33:49 +0100 | [diff] [blame] | 531 | goto err_out; |
Thomas Gleixner | 1adb085 | 2008-04-28 17:01:56 +0200 | [diff] [blame] | 532 | /* Prevent probing on this irq: */ |
Thomas Gleixner | 1ccb4e6 | 2011-02-09 14:44:17 +0100 | [diff] [blame] | 533 | irq_settings_set_noprobe(desc); |
Thomas Gleixner | 3aae994 | 2011-02-04 10:17:52 +0100 | [diff] [blame] | 534 | irq_enable(desc); |
Jiang Liu | 0798abe | 2015-06-04 12:13:27 +0800 | [diff] [blame] | 535 | check_irq_resend(desc); |
Thomas Gleixner | 1adb085 | 2008-04-28 17:01:56 +0200 | [diff] [blame] | 536 | /* fall-through */ |
| 537 | } |
| 538 | default: |
| 539 | desc->depth--; |
| 540 | } |
| 541 | } |
| 542 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | /** |
| 544 | * enable_irq - enable handling of an irq |
| 545 | * @irq: Interrupt to enable |
| 546 | * |
| 547 | * Undoes the effect of one call to disable_irq(). If this |
| 548 | * matches the last disable, processing of interrupts on this |
| 549 | * IRQ line is re-enabled. |
| 550 | * |
Thomas Gleixner | 70aedd2 | 2009-08-13 12:17:48 +0200 | [diff] [blame] | 551 | * This function may be called from IRQ context only when |
Thomas Gleixner | 6b8ff31 | 2010-10-01 12:58:38 +0200 | [diff] [blame] | 552 | * desc->irq_data.chip->bus_lock and desc->chip->bus_sync_unlock are NULL ! |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | */ |
| 554 | void enable_irq(unsigned int irq) |
| 555 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 556 | unsigned long flags; |
Marc Zyngier | 31d9d9b | 2011-09-23 17:03:06 +0100 | [diff] [blame] | 557 | struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | |
Yinghai Lu | 7d94f7c | 2008-08-19 20:50:14 -0700 | [diff] [blame] | 559 | if (!desc) |
Matthew Wilcox | c2b5a25 | 2005-11-03 07:51:18 -0700 | [diff] [blame] | 560 | return; |
Thomas Gleixner | 50f7c03 | 2011-02-03 13:23:54 +0100 | [diff] [blame] | 561 | if (WARN(!desc->irq_data.chip, |
| 562 | KERN_ERR "enable_irq before setup/request_irq: irq %u\n", irq)) |
Thomas Gleixner | 02725e7 | 2011-02-12 10:37:36 +0100 | [diff] [blame] | 563 | goto out; |
Thomas Gleixner | 2656c36 | 2010-10-22 14:47:57 +0200 | [diff] [blame] | 564 | |
Jiang Liu | 79ff1cd | 2015-06-23 19:52:36 +0200 | [diff] [blame] | 565 | __enable_irq(desc); |
Thomas Gleixner | 02725e7 | 2011-02-12 10:37:36 +0100 | [diff] [blame] | 566 | out: |
| 567 | irq_put_desc_busunlock(desc, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | EXPORT_SYMBOL(enable_irq); |
| 570 | |
David Brownell | 0c5d1eb | 2008-10-01 14:46:18 -0700 | [diff] [blame] | 571 | static int set_irq_wake_real(unsigned int irq, unsigned int on) |
Uwe Kleine-König | 2db8732 | 2008-07-23 14:42:25 +0200 | [diff] [blame] | 572 | { |
Yinghai Lu | 08678b0 | 2008-08-19 20:50:05 -0700 | [diff] [blame] | 573 | struct irq_desc *desc = irq_to_desc(irq); |
Uwe Kleine-König | 2db8732 | 2008-07-23 14:42:25 +0200 | [diff] [blame] | 574 | int ret = -ENXIO; |
| 575 | |
Santosh Shilimkar | 60f96b4 | 2011-09-09 13:59:35 +0530 | [diff] [blame] | 576 | if (irq_desc_get_chip(desc)->flags & IRQCHIP_SKIP_SET_WAKE) |
| 577 | return 0; |
| 578 | |
Thomas Gleixner | 2f7e99b | 2010-09-27 12:45:50 +0000 | [diff] [blame] | 579 | if (desc->irq_data.chip->irq_set_wake) |
| 580 | ret = desc->irq_data.chip->irq_set_wake(&desc->irq_data, on); |
Uwe Kleine-König | 2db8732 | 2008-07-23 14:42:25 +0200 | [diff] [blame] | 581 | |
| 582 | return ret; |
| 583 | } |
| 584 | |
Thomas Gleixner | ba9a233 | 2006-06-29 02:24:55 -0700 | [diff] [blame] | 585 | /** |
Thomas Gleixner | a0cd9ca | 2011-02-10 11:36:33 +0100 | [diff] [blame] | 586 | * irq_set_irq_wake - control irq power management wakeup |
Thomas Gleixner | ba9a233 | 2006-06-29 02:24:55 -0700 | [diff] [blame] | 587 | * @irq: interrupt to control |
| 588 | * @on: enable/disable power management wakeup |
| 589 | * |
David Brownell | 15a647e | 2006-07-30 03:03:08 -0700 | [diff] [blame] | 590 | * Enable/disable power management wakeup mode, which is |
| 591 | * disabled by default. Enables and disables must match, |
| 592 | * just as they match for non-wakeup mode support. |
| 593 | * |
| 594 | * Wakeup mode lets this IRQ wake the system from sleep |
| 595 | * states like "suspend to RAM". |
Thomas Gleixner | ba9a233 | 2006-06-29 02:24:55 -0700 | [diff] [blame] | 596 | */ |
Thomas Gleixner | a0cd9ca | 2011-02-10 11:36:33 +0100 | [diff] [blame] | 597 | int irq_set_irq_wake(unsigned int irq, unsigned int on) |
Thomas Gleixner | ba9a233 | 2006-06-29 02:24:55 -0700 | [diff] [blame] | 598 | { |
Thomas Gleixner | ba9a233 | 2006-06-29 02:24:55 -0700 | [diff] [blame] | 599 | unsigned long flags; |
Marc Zyngier | 31d9d9b | 2011-09-23 17:03:06 +0100 | [diff] [blame] | 600 | struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL); |
Uwe Kleine-König | 2db8732 | 2008-07-23 14:42:25 +0200 | [diff] [blame] | 601 | int ret = 0; |
Thomas Gleixner | ba9a233 | 2006-06-29 02:24:55 -0700 | [diff] [blame] | 602 | |
Jesper Juhl | 13863a6 | 2011-06-09 23:14:58 +0200 | [diff] [blame] | 603 | if (!desc) |
| 604 | return -EINVAL; |
| 605 | |
David Brownell | 15a647e | 2006-07-30 03:03:08 -0700 | [diff] [blame] | 606 | /* wakeup-capable irqs can be shared between drivers that |
| 607 | * don't need to have the same sleep mode behaviors. |
| 608 | */ |
David Brownell | 15a647e | 2006-07-30 03:03:08 -0700 | [diff] [blame] | 609 | if (on) { |
Uwe Kleine-König | 2db8732 | 2008-07-23 14:42:25 +0200 | [diff] [blame] | 610 | if (desc->wake_depth++ == 0) { |
| 611 | ret = set_irq_wake_real(irq, on); |
| 612 | if (ret) |
| 613 | desc->wake_depth = 0; |
| 614 | else |
Thomas Gleixner | 7f94226 | 2011-02-10 19:46:26 +0100 | [diff] [blame] | 615 | irqd_set(&desc->irq_data, IRQD_WAKEUP_STATE); |
Uwe Kleine-König | 2db8732 | 2008-07-23 14:42:25 +0200 | [diff] [blame] | 616 | } |
David Brownell | 15a647e | 2006-07-30 03:03:08 -0700 | [diff] [blame] | 617 | } else { |
| 618 | if (desc->wake_depth == 0) { |
Arjan van de Ven | 7a2c477 | 2008-07-25 01:45:54 -0700 | [diff] [blame] | 619 | WARN(1, "Unbalanced IRQ %d wake disable\n", irq); |
Uwe Kleine-König | 2db8732 | 2008-07-23 14:42:25 +0200 | [diff] [blame] | 620 | } else if (--desc->wake_depth == 0) { |
| 621 | ret = set_irq_wake_real(irq, on); |
| 622 | if (ret) |
| 623 | desc->wake_depth = 1; |
| 624 | else |
Thomas Gleixner | 7f94226 | 2011-02-10 19:46:26 +0100 | [diff] [blame] | 625 | irqd_clear(&desc->irq_data, IRQD_WAKEUP_STATE); |
Uwe Kleine-König | 2db8732 | 2008-07-23 14:42:25 +0200 | [diff] [blame] | 626 | } |
David Brownell | 15a647e | 2006-07-30 03:03:08 -0700 | [diff] [blame] | 627 | } |
Thomas Gleixner | 02725e7 | 2011-02-12 10:37:36 +0100 | [diff] [blame] | 628 | irq_put_desc_busunlock(desc, flags); |
Thomas Gleixner | ba9a233 | 2006-06-29 02:24:55 -0700 | [diff] [blame] | 629 | return ret; |
| 630 | } |
Thomas Gleixner | a0cd9ca | 2011-02-10 11:36:33 +0100 | [diff] [blame] | 631 | EXPORT_SYMBOL(irq_set_irq_wake); |
Thomas Gleixner | ba9a233 | 2006-06-29 02:24:55 -0700 | [diff] [blame] | 632 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 633 | /* |
| 634 | * Internal function that tells the architecture code whether a |
| 635 | * particular irq has been exclusively allocated or is available |
| 636 | * for driver use. |
| 637 | */ |
| 638 | int can_request_irq(unsigned int irq, unsigned long irqflags) |
| 639 | { |
Thomas Gleixner | cc8c3b7 | 2010-03-23 22:40:53 +0100 | [diff] [blame] | 640 | unsigned long flags; |
Marc Zyngier | 31d9d9b | 2011-09-23 17:03:06 +0100 | [diff] [blame] | 641 | struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0); |
Thomas Gleixner | 02725e7 | 2011-02-12 10:37:36 +0100 | [diff] [blame] | 642 | int canrequest = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | |
Yinghai Lu | 7d94f7c | 2008-08-19 20:50:14 -0700 | [diff] [blame] | 644 | if (!desc) |
| 645 | return 0; |
| 646 | |
Thomas Gleixner | 02725e7 | 2011-02-12 10:37:36 +0100 | [diff] [blame] | 647 | if (irq_settings_can_request(desc)) { |
Ben Hutchings | 2779db8 | 2013-06-28 02:40:30 +0100 | [diff] [blame] | 648 | if (!desc->action || |
| 649 | irqflags & desc->action->flags & IRQF_SHARED) |
| 650 | canrequest = 1; |
Thomas Gleixner | 02725e7 | 2011-02-12 10:37:36 +0100 | [diff] [blame] | 651 | } |
| 652 | irq_put_desc_unlock(desc, flags); |
| 653 | return canrequest; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 654 | } |
| 655 | |
Jiang Liu | a1ff541 | 2015-06-23 19:47:29 +0200 | [diff] [blame] | 656 | int __irq_set_trigger(struct irq_desc *desc, unsigned long flags) |
Uwe Kleine-König | 82736f4 | 2008-07-23 21:28:54 -0700 | [diff] [blame] | 657 | { |
Thomas Gleixner | 6b8ff31 | 2010-10-01 12:58:38 +0200 | [diff] [blame] | 658 | struct irq_chip *chip = desc->irq_data.chip; |
Thomas Gleixner | d4d5e08 | 2011-02-10 13:16:14 +0100 | [diff] [blame] | 659 | int ret, unmask = 0; |
Uwe Kleine-König | 82736f4 | 2008-07-23 21:28:54 -0700 | [diff] [blame] | 660 | |
Thomas Gleixner | b2ba2c3 | 2010-09-27 12:45:47 +0000 | [diff] [blame] | 661 | if (!chip || !chip->irq_set_type) { |
Uwe Kleine-König | 82736f4 | 2008-07-23 21:28:54 -0700 | [diff] [blame] | 662 | /* |
| 663 | * IRQF_TRIGGER_* but the PIC does not support multiple |
| 664 | * flow-types? |
| 665 | */ |
Jiang Liu | a1ff541 | 2015-06-23 19:47:29 +0200 | [diff] [blame] | 666 | pr_debug("No set_type function for IRQ %d (%s)\n", |
| 667 | irq_desc_get_irq(desc), |
Thomas Gleixner | f5d8947 | 2012-04-19 12:06:13 +0200 | [diff] [blame] | 668 | chip ? (chip->name ? : "unknown") : "unknown"); |
Uwe Kleine-König | 82736f4 | 2008-07-23 21:28:54 -0700 | [diff] [blame] | 669 | return 0; |
| 670 | } |
| 671 | |
Thomas Gleixner | d4d5e08 | 2011-02-10 13:16:14 +0100 | [diff] [blame] | 672 | if (chip->flags & IRQCHIP_SET_TYPE_MASKED) { |
Thomas Gleixner | 32f4125 | 2011-03-28 14:10:52 +0200 | [diff] [blame] | 673 | if (!irqd_irq_masked(&desc->irq_data)) |
Thomas Gleixner | d4d5e08 | 2011-02-10 13:16:14 +0100 | [diff] [blame] | 674 | mask_irq(desc); |
Thomas Gleixner | 32f4125 | 2011-03-28 14:10:52 +0200 | [diff] [blame] | 675 | if (!irqd_irq_disabled(&desc->irq_data)) |
Thomas Gleixner | d4d5e08 | 2011-02-10 13:16:14 +0100 | [diff] [blame] | 676 | unmask = 1; |
| 677 | } |
| 678 | |
Alexander Kuleshov | 00b992d | 2016-07-19 15:54:08 +0600 | [diff] [blame] | 679 | /* Mask all flags except trigger mode */ |
| 680 | flags &= IRQ_TYPE_SENSE_MASK; |
Thomas Gleixner | b2ba2c3 | 2010-09-27 12:45:47 +0000 | [diff] [blame] | 681 | ret = chip->irq_set_type(&desc->irq_data, flags); |
Uwe Kleine-König | 82736f4 | 2008-07-23 21:28:54 -0700 | [diff] [blame] | 682 | |
Thomas Gleixner | 876dbd4 | 2011-02-08 17:28:12 +0100 | [diff] [blame] | 683 | switch (ret) { |
| 684 | case IRQ_SET_MASK_OK: |
Jiang Liu | 2cb6254 | 2014-11-06 22:20:18 +0800 | [diff] [blame] | 685 | case IRQ_SET_MASK_OK_DONE: |
Thomas Gleixner | 876dbd4 | 2011-02-08 17:28:12 +0100 | [diff] [blame] | 686 | irqd_clear(&desc->irq_data, IRQD_TRIGGER_MASK); |
| 687 | irqd_set(&desc->irq_data, flags); |
| 688 | |
| 689 | case IRQ_SET_MASK_OK_NOCOPY: |
| 690 | flags = irqd_get_trigger_type(&desc->irq_data); |
| 691 | irq_settings_set_trigger_mask(desc, flags); |
| 692 | irqd_clear(&desc->irq_data, IRQD_LEVEL); |
| 693 | irq_settings_clr_level(desc); |
| 694 | if (flags & IRQ_TYPE_LEVEL_MASK) { |
| 695 | irq_settings_set_level(desc); |
| 696 | irqd_set(&desc->irq_data, IRQD_LEVEL); |
| 697 | } |
Thomas Gleixner | 4673247 | 2010-06-07 17:53:51 +0200 | [diff] [blame] | 698 | |
Thomas Gleixner | d4d5e08 | 2011-02-10 13:16:14 +0100 | [diff] [blame] | 699 | ret = 0; |
Thomas Gleixner | 8fff39e | 2011-02-21 14:19:42 +0100 | [diff] [blame] | 700 | break; |
Thomas Gleixner | 876dbd4 | 2011-02-08 17:28:12 +0100 | [diff] [blame] | 701 | default: |
Andrew Morton | 97fd75b | 2012-05-31 16:26:07 -0700 | [diff] [blame] | 702 | pr_err("Setting trigger mode %lu for irq %u failed (%pF)\n", |
Jiang Liu | a1ff541 | 2015-06-23 19:47:29 +0200 | [diff] [blame] | 703 | flags, irq_desc_get_irq(desc), chip->irq_set_type); |
David Brownell | 0c5d1eb | 2008-10-01 14:46:18 -0700 | [diff] [blame] | 704 | } |
Thomas Gleixner | d4d5e08 | 2011-02-10 13:16:14 +0100 | [diff] [blame] | 705 | if (unmask) |
| 706 | unmask_irq(desc); |
Uwe Kleine-König | 82736f4 | 2008-07-23 21:28:54 -0700 | [diff] [blame] | 707 | return ret; |
| 708 | } |
| 709 | |
Thomas Gleixner | 293a7a0 | 2012-10-16 15:07:49 -0700 | [diff] [blame] | 710 | #ifdef CONFIG_HARDIRQS_SW_RESEND |
| 711 | int irq_set_parent(int irq, int parent_irq) |
| 712 | { |
| 713 | unsigned long flags; |
| 714 | struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0); |
| 715 | |
| 716 | if (!desc) |
| 717 | return -EINVAL; |
| 718 | |
| 719 | desc->parent_irq = parent_irq; |
| 720 | |
| 721 | irq_put_desc_unlock(desc, flags); |
| 722 | return 0; |
| 723 | } |
Sudip Mukherjee | 3118dac | 2016-10-06 23:06:43 +0530 | [diff] [blame] | 724 | EXPORT_SYMBOL_GPL(irq_set_parent); |
Thomas Gleixner | 293a7a0 | 2012-10-16 15:07:49 -0700 | [diff] [blame] | 725 | #endif |
| 726 | |
Thomas Gleixner | b25c340 | 2009-08-13 12:17:22 +0200 | [diff] [blame] | 727 | /* |
| 728 | * Default primary interrupt handler for threaded interrupts. Is |
| 729 | * assigned as primary handler when request_threaded_irq is called |
| 730 | * with handler == NULL. Useful for oneshot interrupts. |
| 731 | */ |
| 732 | static irqreturn_t irq_default_primary_handler(int irq, void *dev_id) |
| 733 | { |
| 734 | return IRQ_WAKE_THREAD; |
| 735 | } |
| 736 | |
Thomas Gleixner | 399b5da | 2009-08-13 13:21:38 +0200 | [diff] [blame] | 737 | /* |
| 738 | * Primary handler for nested threaded interrupts. Should never be |
| 739 | * called. |
| 740 | */ |
| 741 | static irqreturn_t irq_nested_primary_handler(int irq, void *dev_id) |
| 742 | { |
| 743 | WARN(1, "Primary handler called for nested irq %d\n", irq); |
| 744 | return IRQ_NONE; |
| 745 | } |
| 746 | |
Thomas Gleixner | 2a1d3ab | 2015-09-21 11:01:10 +0200 | [diff] [blame] | 747 | static irqreturn_t irq_forced_secondary_handler(int irq, void *dev_id) |
| 748 | { |
| 749 | WARN(1, "Secondary action handler called for irq %d\n", irq); |
| 750 | return IRQ_NONE; |
| 751 | } |
| 752 | |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 753 | static int irq_wait_for_interrupt(struct irqaction *action) |
| 754 | { |
Ido Yariv | 550acb1 | 2011-12-01 13:55:08 +0200 | [diff] [blame] | 755 | set_current_state(TASK_INTERRUPTIBLE); |
| 756 | |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 757 | while (!kthread_should_stop()) { |
Thomas Gleixner | f48fe81 | 2009-03-24 11:46:22 +0100 | [diff] [blame] | 758 | |
| 759 | if (test_and_clear_bit(IRQTF_RUNTHREAD, |
| 760 | &action->thread_flags)) { |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 761 | __set_current_state(TASK_RUNNING); |
| 762 | return 0; |
Thomas Gleixner | f48fe81 | 2009-03-24 11:46:22 +0100 | [diff] [blame] | 763 | } |
| 764 | schedule(); |
Ido Yariv | 550acb1 | 2011-12-01 13:55:08 +0200 | [diff] [blame] | 765 | set_current_state(TASK_INTERRUPTIBLE); |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 766 | } |
Ido Yariv | 550acb1 | 2011-12-01 13:55:08 +0200 | [diff] [blame] | 767 | __set_current_state(TASK_RUNNING); |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 768 | return -1; |
| 769 | } |
| 770 | |
Thomas Gleixner | b25c340 | 2009-08-13 12:17:22 +0200 | [diff] [blame] | 771 | /* |
| 772 | * Oneshot interrupts keep the irq line masked until the threaded |
| 773 | * handler finished. unmask if the interrupt has not been disabled and |
| 774 | * is marked MASKED. |
| 775 | */ |
Thomas Gleixner | b5faba2 | 2011-02-23 23:52:13 +0000 | [diff] [blame] | 776 | static void irq_finalize_oneshot(struct irq_desc *desc, |
Alexander Gordeev | f3f79e3 | 2012-03-21 17:22:35 +0100 | [diff] [blame] | 777 | struct irqaction *action) |
Thomas Gleixner | b25c340 | 2009-08-13 12:17:22 +0200 | [diff] [blame] | 778 | { |
Thomas Gleixner | 2a1d3ab | 2015-09-21 11:01:10 +0200 | [diff] [blame] | 779 | if (!(desc->istate & IRQS_ONESHOT) || |
| 780 | action->handler == irq_forced_secondary_handler) |
Thomas Gleixner | b5faba2 | 2011-02-23 23:52:13 +0000 | [diff] [blame] | 781 | return; |
Thomas Gleixner | 0b1adaa | 2010-03-09 19:45:54 +0100 | [diff] [blame] | 782 | again: |
Thomas Gleixner | 3876ec9 | 2010-09-27 12:44:35 +0000 | [diff] [blame] | 783 | chip_bus_lock(desc); |
Thomas Gleixner | 239007b | 2009-11-17 16:46:45 +0100 | [diff] [blame] | 784 | raw_spin_lock_irq(&desc->lock); |
Thomas Gleixner | 0b1adaa | 2010-03-09 19:45:54 +0100 | [diff] [blame] | 785 | |
| 786 | /* |
| 787 | * Implausible though it may be we need to protect us against |
| 788 | * the following scenario: |
| 789 | * |
| 790 | * The thread is faster done than the hard interrupt handler |
| 791 | * on the other CPU. If we unmask the irq line then the |
| 792 | * interrupt can come in again and masks the line, leaves due |
Thomas Gleixner | 009b4c3 | 2011-02-07 21:48:49 +0100 | [diff] [blame] | 793 | * to IRQS_INPROGRESS and the irq line is masked forever. |
Thomas Gleixner | b5faba2 | 2011-02-23 23:52:13 +0000 | [diff] [blame] | 794 | * |
| 795 | * This also serializes the state of shared oneshot handlers |
| 796 | * versus "desc->threads_onehsot |= action->thread_mask;" in |
| 797 | * irq_wake_thread(). See the comment there which explains the |
| 798 | * serialization. |
Thomas Gleixner | 0b1adaa | 2010-03-09 19:45:54 +0100 | [diff] [blame] | 799 | */ |
Thomas Gleixner | 32f4125 | 2011-03-28 14:10:52 +0200 | [diff] [blame] | 800 | if (unlikely(irqd_irq_inprogress(&desc->irq_data))) { |
Thomas Gleixner | 0b1adaa | 2010-03-09 19:45:54 +0100 | [diff] [blame] | 801 | raw_spin_unlock_irq(&desc->lock); |
Thomas Gleixner | 3876ec9 | 2010-09-27 12:44:35 +0000 | [diff] [blame] | 802 | chip_bus_sync_unlock(desc); |
Thomas Gleixner | 0b1adaa | 2010-03-09 19:45:54 +0100 | [diff] [blame] | 803 | cpu_relax(); |
| 804 | goto again; |
| 805 | } |
| 806 | |
Thomas Gleixner | b5faba2 | 2011-02-23 23:52:13 +0000 | [diff] [blame] | 807 | /* |
| 808 | * Now check again, whether the thread should run. Otherwise |
| 809 | * we would clear the threads_oneshot bit of this thread which |
| 810 | * was just set. |
| 811 | */ |
Alexander Gordeev | f3f79e3 | 2012-03-21 17:22:35 +0100 | [diff] [blame] | 812 | if (test_bit(IRQTF_RUNTHREAD, &action->thread_flags)) |
Thomas Gleixner | b5faba2 | 2011-02-23 23:52:13 +0000 | [diff] [blame] | 813 | goto out_unlock; |
| 814 | |
| 815 | desc->threads_oneshot &= ~action->thread_mask; |
| 816 | |
Thomas Gleixner | 32f4125 | 2011-03-28 14:10:52 +0200 | [diff] [blame] | 817 | if (!desc->threads_oneshot && !irqd_irq_disabled(&desc->irq_data) && |
| 818 | irqd_irq_masked(&desc->irq_data)) |
Thomas Gleixner | 328a497 | 2014-03-13 19:03:51 +0100 | [diff] [blame] | 819 | unmask_threaded_irq(desc); |
Thomas Gleixner | 32f4125 | 2011-03-28 14:10:52 +0200 | [diff] [blame] | 820 | |
Thomas Gleixner | b5faba2 | 2011-02-23 23:52:13 +0000 | [diff] [blame] | 821 | out_unlock: |
Thomas Gleixner | 239007b | 2009-11-17 16:46:45 +0100 | [diff] [blame] | 822 | raw_spin_unlock_irq(&desc->lock); |
Thomas Gleixner | 3876ec9 | 2010-09-27 12:44:35 +0000 | [diff] [blame] | 823 | chip_bus_sync_unlock(desc); |
Thomas Gleixner | b25c340 | 2009-08-13 12:17:22 +0200 | [diff] [blame] | 824 | } |
| 825 | |
Bruno Premont | 61f3826 | 2009-07-22 22:22:32 +0200 | [diff] [blame] | 826 | #ifdef CONFIG_SMP |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 827 | /* |
Chuansheng Liu | b04c644 | 2014-02-10 16:13:57 +0800 | [diff] [blame] | 828 | * Check whether we need to change the affinity of the interrupt thread. |
Thomas Gleixner | 591d2fb | 2009-07-21 11:09:39 +0200 | [diff] [blame] | 829 | */ |
| 830 | static void |
| 831 | irq_thread_check_affinity(struct irq_desc *desc, struct irqaction *action) |
| 832 | { |
| 833 | cpumask_var_t mask; |
Thomas Gleixner | 04aa530 | 2012-11-03 11:52:09 +0100 | [diff] [blame] | 834 | bool valid = true; |
Thomas Gleixner | 591d2fb | 2009-07-21 11:09:39 +0200 | [diff] [blame] | 835 | |
| 836 | if (!test_and_clear_bit(IRQTF_AFFINITY, &action->thread_flags)) |
| 837 | return; |
| 838 | |
| 839 | /* |
| 840 | * In case we are out of memory we set IRQTF_AFFINITY again and |
| 841 | * try again next time |
| 842 | */ |
| 843 | if (!alloc_cpumask_var(&mask, GFP_KERNEL)) { |
| 844 | set_bit(IRQTF_AFFINITY, &action->thread_flags); |
| 845 | return; |
| 846 | } |
| 847 | |
Thomas Gleixner | 239007b | 2009-11-17 16:46:45 +0100 | [diff] [blame] | 848 | raw_spin_lock_irq(&desc->lock); |
Thomas Gleixner | 04aa530 | 2012-11-03 11:52:09 +0100 | [diff] [blame] | 849 | /* |
| 850 | * This code is triggered unconditionally. Check the affinity |
| 851 | * mask pointer. For CPU_MASK_OFFSTACK=n this is optimized out. |
| 852 | */ |
Matthias Kaehlcke | 02e3a7d | 2017-04-12 11:20:30 -0700 | [diff] [blame] | 853 | if (cpumask_available(desc->irq_common_data.affinity)) |
Jiang Liu | 9df872f | 2015-06-03 11:47:50 +0800 | [diff] [blame] | 854 | cpumask_copy(mask, desc->irq_common_data.affinity); |
Thomas Gleixner | 04aa530 | 2012-11-03 11:52:09 +0100 | [diff] [blame] | 855 | else |
| 856 | valid = false; |
Thomas Gleixner | 239007b | 2009-11-17 16:46:45 +0100 | [diff] [blame] | 857 | raw_spin_unlock_irq(&desc->lock); |
Thomas Gleixner | 591d2fb | 2009-07-21 11:09:39 +0200 | [diff] [blame] | 858 | |
Thomas Gleixner | 04aa530 | 2012-11-03 11:52:09 +0100 | [diff] [blame] | 859 | if (valid) |
| 860 | set_cpus_allowed_ptr(current, mask); |
Thomas Gleixner | 591d2fb | 2009-07-21 11:09:39 +0200 | [diff] [blame] | 861 | free_cpumask_var(mask); |
| 862 | } |
Bruno Premont | 61f3826 | 2009-07-22 22:22:32 +0200 | [diff] [blame] | 863 | #else |
| 864 | static inline void |
| 865 | irq_thread_check_affinity(struct irq_desc *desc, struct irqaction *action) { } |
| 866 | #endif |
Thomas Gleixner | 591d2fb | 2009-07-21 11:09:39 +0200 | [diff] [blame] | 867 | |
| 868 | /* |
Thomas Gleixner | 8d32a30 | 2011-02-23 23:52:23 +0000 | [diff] [blame] | 869 | * Interrupts which are not explicitely requested as threaded |
| 870 | * interrupts rely on the implicit bh/preempt disable of the hard irq |
| 871 | * context. So we need to disable bh here to avoid deadlocks and other |
| 872 | * side effects. |
| 873 | */ |
Sebastian Andrzej Siewior | 3a43e05 | 2011-05-31 08:56:11 +0200 | [diff] [blame] | 874 | static irqreturn_t |
Thomas Gleixner | 8d32a30 | 2011-02-23 23:52:23 +0000 | [diff] [blame] | 875 | irq_forced_thread_fn(struct irq_desc *desc, struct irqaction *action) |
| 876 | { |
Sebastian Andrzej Siewior | 3a43e05 | 2011-05-31 08:56:11 +0200 | [diff] [blame] | 877 | irqreturn_t ret; |
| 878 | |
Thomas Gleixner | 8d32a30 | 2011-02-23 23:52:23 +0000 | [diff] [blame] | 879 | local_bh_disable(); |
Sebastian Andrzej Siewior | 3a43e05 | 2011-05-31 08:56:11 +0200 | [diff] [blame] | 880 | ret = action->thread_fn(action->irq, action->dev_id); |
Alexander Gordeev | f3f79e3 | 2012-03-21 17:22:35 +0100 | [diff] [blame] | 881 | irq_finalize_oneshot(desc, action); |
Thomas Gleixner | 8d32a30 | 2011-02-23 23:52:23 +0000 | [diff] [blame] | 882 | local_bh_enable(); |
Sebastian Andrzej Siewior | 3a43e05 | 2011-05-31 08:56:11 +0200 | [diff] [blame] | 883 | return ret; |
Thomas Gleixner | 8d32a30 | 2011-02-23 23:52:23 +0000 | [diff] [blame] | 884 | } |
| 885 | |
| 886 | /* |
Xie XiuQi | f788e7b | 2013-10-18 09:12:04 +0800 | [diff] [blame] | 887 | * Interrupts explicitly requested as threaded interrupts want to be |
Thomas Gleixner | 8d32a30 | 2011-02-23 23:52:23 +0000 | [diff] [blame] | 888 | * preemtible - many of them need to sleep and wait for slow busses to |
| 889 | * complete. |
| 890 | */ |
Sebastian Andrzej Siewior | 3a43e05 | 2011-05-31 08:56:11 +0200 | [diff] [blame] | 891 | static irqreturn_t irq_thread_fn(struct irq_desc *desc, |
| 892 | struct irqaction *action) |
Thomas Gleixner | 8d32a30 | 2011-02-23 23:52:23 +0000 | [diff] [blame] | 893 | { |
Sebastian Andrzej Siewior | 3a43e05 | 2011-05-31 08:56:11 +0200 | [diff] [blame] | 894 | irqreturn_t ret; |
| 895 | |
| 896 | ret = action->thread_fn(action->irq, action->dev_id); |
Alexander Gordeev | f3f79e3 | 2012-03-21 17:22:35 +0100 | [diff] [blame] | 897 | irq_finalize_oneshot(desc, action); |
Sebastian Andrzej Siewior | 3a43e05 | 2011-05-31 08:56:11 +0200 | [diff] [blame] | 898 | return ret; |
Thomas Gleixner | 8d32a30 | 2011-02-23 23:52:23 +0000 | [diff] [blame] | 899 | } |
| 900 | |
Ido Yariv | 7140ea1 | 2011-12-02 18:24:12 +0200 | [diff] [blame] | 901 | static void wake_threads_waitq(struct irq_desc *desc) |
| 902 | { |
Chuansheng Liu | c685689 | 2014-02-24 11:29:50 +0800 | [diff] [blame] | 903 | if (atomic_dec_and_test(&desc->threads_active)) |
Ido Yariv | 7140ea1 | 2011-12-02 18:24:12 +0200 | [diff] [blame] | 904 | wake_up(&desc->wait_for_threads); |
| 905 | } |
| 906 | |
Al Viro | 67d1214 | 2012-06-27 11:07:19 +0400 | [diff] [blame] | 907 | static void irq_thread_dtor(struct callback_head *unused) |
Oleg Nesterov | 4d1d61a | 2012-05-11 10:59:08 +1000 | [diff] [blame] | 908 | { |
| 909 | struct task_struct *tsk = current; |
| 910 | struct irq_desc *desc; |
| 911 | struct irqaction *action; |
| 912 | |
| 913 | if (WARN_ON_ONCE(!(current->flags & PF_EXITING))) |
| 914 | return; |
| 915 | |
| 916 | action = kthread_data(tsk); |
| 917 | |
Linus Torvalds | fb21aff | 2012-05-31 18:47:30 -0700 | [diff] [blame] | 918 | pr_err("exiting task \"%s\" (%d) is an active IRQ thread (irq %d)\n", |
Alan Cox | 19af395 | 2012-12-18 14:21:25 -0800 | [diff] [blame] | 919 | tsk->comm, tsk->pid, action->irq); |
Oleg Nesterov | 4d1d61a | 2012-05-11 10:59:08 +1000 | [diff] [blame] | 920 | |
| 921 | |
| 922 | desc = irq_to_desc(action->irq); |
| 923 | /* |
| 924 | * If IRQTF_RUNTHREAD is set, we need to decrement |
| 925 | * desc->threads_active and wake possible waiters. |
| 926 | */ |
| 927 | if (test_and_clear_bit(IRQTF_RUNTHREAD, &action->thread_flags)) |
| 928 | wake_threads_waitq(desc); |
| 929 | |
| 930 | /* Prevent a stale desc->threads_oneshot */ |
| 931 | irq_finalize_oneshot(desc, action); |
| 932 | } |
| 933 | |
Thomas Gleixner | 2a1d3ab | 2015-09-21 11:01:10 +0200 | [diff] [blame] | 934 | static void irq_wake_secondary(struct irq_desc *desc, struct irqaction *action) |
| 935 | { |
| 936 | struct irqaction *secondary = action->secondary; |
| 937 | |
| 938 | if (WARN_ON_ONCE(!secondary)) |
| 939 | return; |
| 940 | |
| 941 | raw_spin_lock_irq(&desc->lock); |
| 942 | __irq_wake_thread(desc, secondary); |
| 943 | raw_spin_unlock_irq(&desc->lock); |
| 944 | } |
| 945 | |
Thomas Gleixner | 8d32a30 | 2011-02-23 23:52:23 +0000 | [diff] [blame] | 946 | /* |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 947 | * Interrupt handler thread |
| 948 | */ |
| 949 | static int irq_thread(void *data) |
| 950 | { |
Al Viro | 67d1214 | 2012-06-27 11:07:19 +0400 | [diff] [blame] | 951 | struct callback_head on_exit_work; |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 952 | struct irqaction *action = data; |
| 953 | struct irq_desc *desc = irq_to_desc(action->irq); |
Sebastian Andrzej Siewior | 3a43e05 | 2011-05-31 08:56:11 +0200 | [diff] [blame] | 954 | irqreturn_t (*handler_fn)(struct irq_desc *desc, |
| 955 | struct irqaction *action); |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 956 | |
Alexander Gordeev | 540b60e | 2012-03-09 14:59:13 +0100 | [diff] [blame] | 957 | if (force_irqthreads && test_bit(IRQTF_FORCED_THREAD, |
Thomas Gleixner | 8d32a30 | 2011-02-23 23:52:23 +0000 | [diff] [blame] | 958 | &action->thread_flags)) |
| 959 | handler_fn = irq_forced_thread_fn; |
| 960 | else |
| 961 | handler_fn = irq_thread_fn; |
| 962 | |
Al Viro | 41f9d29 | 2012-06-26 22:10:04 +0400 | [diff] [blame] | 963 | init_task_work(&on_exit_work, irq_thread_dtor); |
Oleg Nesterov | 4d1d61a | 2012-05-11 10:59:08 +1000 | [diff] [blame] | 964 | task_work_add(current, &on_exit_work, false); |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 965 | |
Sankara Muthukrishnan | f3de44e | 2012-10-31 15:41:23 -0500 | [diff] [blame] | 966 | irq_thread_check_affinity(desc, action); |
| 967 | |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 968 | while (!irq_wait_for_interrupt(action)) { |
Ido Yariv | 7140ea1 | 2011-12-02 18:24:12 +0200 | [diff] [blame] | 969 | irqreturn_t action_ret; |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 970 | |
Thomas Gleixner | 591d2fb | 2009-07-21 11:09:39 +0200 | [diff] [blame] | 971 | irq_thread_check_affinity(desc, action); |
| 972 | |
Ido Yariv | 7140ea1 | 2011-12-02 18:24:12 +0200 | [diff] [blame] | 973 | action_ret = handler_fn(desc, action); |
Thomas Gleixner | 1e77d0a | 2013-03-07 14:53:45 +0100 | [diff] [blame] | 974 | if (action_ret == IRQ_HANDLED) |
| 975 | atomic_inc(&desc->threads_handled); |
Thomas Gleixner | 2a1d3ab | 2015-09-21 11:01:10 +0200 | [diff] [blame] | 976 | if (action_ret == IRQ_WAKE_THREAD) |
| 977 | irq_wake_secondary(desc, action); |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 978 | |
Ido Yariv | 7140ea1 | 2011-12-02 18:24:12 +0200 | [diff] [blame] | 979 | wake_threads_waitq(desc); |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 980 | } |
| 981 | |
Ido Yariv | 7140ea1 | 2011-12-02 18:24:12 +0200 | [diff] [blame] | 982 | /* |
| 983 | * This is the regular exit path. __free_irq() is stopping the |
| 984 | * thread via kthread_stop() after calling |
| 985 | * synchronize_irq(). So neither IRQTF_RUNTHREAD nor the |
Thomas Gleixner | e04268b | 2012-03-15 22:55:21 +0100 | [diff] [blame] | 986 | * oneshot mask bit can be set. We cannot verify that as we |
| 987 | * cannot touch the oneshot mask at this point anymore as |
| 988 | * __setup_irq() might have given out currents thread_mask |
| 989 | * again. |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 990 | */ |
Oleg Nesterov | 4d1d61a | 2012-05-11 10:59:08 +1000 | [diff] [blame] | 991 | task_work_cancel(current, irq_thread_dtor); |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 992 | return 0; |
| 993 | } |
| 994 | |
Thomas Gleixner | a92444c | 2014-02-15 00:55:19 +0000 | [diff] [blame] | 995 | /** |
| 996 | * irq_wake_thread - wake the irq thread for the action identified by dev_id |
| 997 | * @irq: Interrupt line |
| 998 | * @dev_id: Device identity for which the thread should be woken |
| 999 | * |
| 1000 | */ |
| 1001 | void irq_wake_thread(unsigned int irq, void *dev_id) |
| 1002 | { |
| 1003 | struct irq_desc *desc = irq_to_desc(irq); |
| 1004 | struct irqaction *action; |
| 1005 | unsigned long flags; |
| 1006 | |
| 1007 | if (!desc || WARN_ON(irq_settings_is_per_cpu_devid(desc))) |
| 1008 | return; |
| 1009 | |
| 1010 | raw_spin_lock_irqsave(&desc->lock, flags); |
Daniel Lezcano | f944b5a | 2016-01-14 10:54:13 +0100 | [diff] [blame] | 1011 | for_each_action_of_desc(desc, action) { |
Thomas Gleixner | a92444c | 2014-02-15 00:55:19 +0000 | [diff] [blame] | 1012 | if (action->dev_id == dev_id) { |
| 1013 | if (action->thread) |
| 1014 | __irq_wake_thread(desc, action); |
| 1015 | break; |
| 1016 | } |
| 1017 | } |
| 1018 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
| 1019 | } |
| 1020 | EXPORT_SYMBOL_GPL(irq_wake_thread); |
| 1021 | |
Thomas Gleixner | 2a1d3ab | 2015-09-21 11:01:10 +0200 | [diff] [blame] | 1022 | static int irq_setup_forced_threading(struct irqaction *new) |
Thomas Gleixner | 8d32a30 | 2011-02-23 23:52:23 +0000 | [diff] [blame] | 1023 | { |
| 1024 | if (!force_irqthreads) |
Thomas Gleixner | 2a1d3ab | 2015-09-21 11:01:10 +0200 | [diff] [blame] | 1025 | return 0; |
Thomas Gleixner | 8d32a30 | 2011-02-23 23:52:23 +0000 | [diff] [blame] | 1026 | if (new->flags & (IRQF_NO_THREAD | IRQF_PERCPU | IRQF_ONESHOT)) |
Thomas Gleixner | 2a1d3ab | 2015-09-21 11:01:10 +0200 | [diff] [blame] | 1027 | return 0; |
Thomas Gleixner | 8d32a30 | 2011-02-23 23:52:23 +0000 | [diff] [blame] | 1028 | |
Thomas Gleixner | eecd08a | 2018-08-03 14:44:59 +0200 | [diff] [blame] | 1029 | /* |
| 1030 | * No further action required for interrupts which are requested as |
| 1031 | * threaded interrupts already |
| 1032 | */ |
| 1033 | if (new->handler == irq_default_primary_handler) |
| 1034 | return 0; |
| 1035 | |
Thomas Gleixner | 8d32a30 | 2011-02-23 23:52:23 +0000 | [diff] [blame] | 1036 | new->flags |= IRQF_ONESHOT; |
| 1037 | |
Thomas Gleixner | 2a1d3ab | 2015-09-21 11:01:10 +0200 | [diff] [blame] | 1038 | /* |
| 1039 | * Handle the case where we have a real primary handler and a |
| 1040 | * thread handler. We force thread them as well by creating a |
| 1041 | * secondary action. |
| 1042 | */ |
Thomas Gleixner | eecd08a | 2018-08-03 14:44:59 +0200 | [diff] [blame] | 1043 | if (new->handler && new->thread_fn) { |
Thomas Gleixner | 2a1d3ab | 2015-09-21 11:01:10 +0200 | [diff] [blame] | 1044 | /* Allocate the secondary action */ |
| 1045 | new->secondary = kzalloc(sizeof(struct irqaction), GFP_KERNEL); |
| 1046 | if (!new->secondary) |
| 1047 | return -ENOMEM; |
| 1048 | new->secondary->handler = irq_forced_secondary_handler; |
| 1049 | new->secondary->thread_fn = new->thread_fn; |
| 1050 | new->secondary->dev_id = new->dev_id; |
| 1051 | new->secondary->irq = new->irq; |
| 1052 | new->secondary->name = new->name; |
Thomas Gleixner | 8d32a30 | 2011-02-23 23:52:23 +0000 | [diff] [blame] | 1053 | } |
Thomas Gleixner | 2a1d3ab | 2015-09-21 11:01:10 +0200 | [diff] [blame] | 1054 | /* Deal with the primary handler */ |
| 1055 | set_bit(IRQTF_FORCED_THREAD, &new->thread_flags); |
| 1056 | new->thread_fn = new->handler; |
| 1057 | new->handler = irq_default_primary_handler; |
| 1058 | return 0; |
Thomas Gleixner | 8d32a30 | 2011-02-23 23:52:23 +0000 | [diff] [blame] | 1059 | } |
| 1060 | |
Thomas Gleixner | c1bacba | 2014-03-08 08:59:58 +0100 | [diff] [blame] | 1061 | static int irq_request_resources(struct irq_desc *desc) |
| 1062 | { |
| 1063 | struct irq_data *d = &desc->irq_data; |
| 1064 | struct irq_chip *c = d->chip; |
| 1065 | |
| 1066 | return c->irq_request_resources ? c->irq_request_resources(d) : 0; |
| 1067 | } |
| 1068 | |
| 1069 | static void irq_release_resources(struct irq_desc *desc) |
| 1070 | { |
| 1071 | struct irq_data *d = &desc->irq_data; |
| 1072 | struct irq_chip *c = d->chip; |
| 1073 | |
| 1074 | if (c->irq_release_resources) |
| 1075 | c->irq_release_resources(d); |
| 1076 | } |
| 1077 | |
Thomas Gleixner | 2a1d3ab | 2015-09-21 11:01:10 +0200 | [diff] [blame] | 1078 | static int |
| 1079 | setup_irq_thread(struct irqaction *new, unsigned int irq, bool secondary) |
| 1080 | { |
| 1081 | struct task_struct *t; |
| 1082 | struct sched_param param = { |
| 1083 | .sched_priority = MAX_USER_RT_PRIO/2, |
| 1084 | }; |
| 1085 | |
| 1086 | if (!secondary) { |
| 1087 | t = kthread_create(irq_thread, new, "irq/%d-%s", irq, |
| 1088 | new->name); |
| 1089 | } else { |
| 1090 | t = kthread_create(irq_thread, new, "irq/%d-s-%s", irq, |
| 1091 | new->name); |
| 1092 | param.sched_priority -= 1; |
| 1093 | } |
| 1094 | |
| 1095 | if (IS_ERR(t)) |
| 1096 | return PTR_ERR(t); |
| 1097 | |
| 1098 | sched_setscheduler_nocheck(t, SCHED_FIFO, ¶m); |
| 1099 | |
| 1100 | /* |
| 1101 | * We keep the reference to the task struct even if |
| 1102 | * the thread dies to avoid that the interrupt code |
| 1103 | * references an already freed task_struct. |
| 1104 | */ |
| 1105 | get_task_struct(t); |
| 1106 | new->thread = t; |
| 1107 | /* |
| 1108 | * Tell the thread to set its affinity. This is |
| 1109 | * important for shared interrupt handlers as we do |
| 1110 | * not invoke setup_affinity() for the secondary |
| 1111 | * handlers as everything is already set up. Even for |
| 1112 | * interrupts marked with IRQF_NO_BALANCE this is |
| 1113 | * correct as we want the thread to move to the cpu(s) |
| 1114 | * on which the requesting code placed the interrupt. |
| 1115 | */ |
| 1116 | set_bit(IRQTF_AFFINITY, &new->thread_flags); |
| 1117 | return 0; |
| 1118 | } |
| 1119 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1120 | /* |
| 1121 | * Internal function to register an irqaction - typically used to |
| 1122 | * allocate special interrupts that are part of the architecture. |
| 1123 | */ |
Thomas Gleixner | d3c6004 | 2008-10-16 09:55:00 +0200 | [diff] [blame] | 1124 | static int |
Ingo Molnar | 327ec56 | 2009-02-15 11:21:37 +0100 | [diff] [blame] | 1125 | __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1126 | { |
Ingo Molnar | f17c754 | 2009-02-17 20:43:37 +0100 | [diff] [blame] | 1127 | struct irqaction *old, **old_ptr; |
Thomas Gleixner | b5faba2 | 2011-02-23 23:52:13 +0000 | [diff] [blame] | 1128 | unsigned long flags, thread_mask = 0; |
Thomas Gleixner | 3b8249e | 2011-02-07 16:02:20 +0100 | [diff] [blame] | 1129 | int ret, nested, shared = 0; |
| 1130 | cpumask_var_t mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1131 | |
Yinghai Lu | 7d94f7c | 2008-08-19 20:50:14 -0700 | [diff] [blame] | 1132 | if (!desc) |
Matthew Wilcox | c2b5a25 | 2005-11-03 07:51:18 -0700 | [diff] [blame] | 1133 | return -EINVAL; |
| 1134 | |
Thomas Gleixner | 6b8ff31 | 2010-10-01 12:58:38 +0200 | [diff] [blame] | 1135 | if (desc->irq_data.chip == &no_irq_chip) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1136 | return -ENOSYS; |
Sebastian Andrzej Siewior | b687380 | 2011-07-11 12:17:31 +0200 | [diff] [blame] | 1137 | if (!try_module_get(desc->owner)) |
| 1138 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1139 | |
Thomas Gleixner | 2a1d3ab | 2015-09-21 11:01:10 +0200 | [diff] [blame] | 1140 | new->irq = irq; |
| 1141 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1142 | /* |
Jon Hunter | 4b357da | 2016-06-07 16:12:27 +0100 | [diff] [blame] | 1143 | * If the trigger type is not specified by the caller, |
| 1144 | * then use the default for this interrupt. |
| 1145 | */ |
| 1146 | if (!(new->flags & IRQF_TRIGGER_MASK)) |
| 1147 | new->flags |= irqd_get_trigger_type(&desc->irq_data); |
| 1148 | |
| 1149 | /* |
Thomas Gleixner | 399b5da | 2009-08-13 13:21:38 +0200 | [diff] [blame] | 1150 | * Check whether the interrupt nests into another interrupt |
| 1151 | * thread. |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 1152 | */ |
Thomas Gleixner | 1ccb4e6 | 2011-02-09 14:44:17 +0100 | [diff] [blame] | 1153 | nested = irq_settings_is_nested_thread(desc); |
Thomas Gleixner | 399b5da | 2009-08-13 13:21:38 +0200 | [diff] [blame] | 1154 | if (nested) { |
Sebastian Andrzej Siewior | b687380 | 2011-07-11 12:17:31 +0200 | [diff] [blame] | 1155 | if (!new->thread_fn) { |
| 1156 | ret = -EINVAL; |
| 1157 | goto out_mput; |
| 1158 | } |
Thomas Gleixner | 399b5da | 2009-08-13 13:21:38 +0200 | [diff] [blame] | 1159 | /* |
| 1160 | * Replace the primary handler which was provided from |
| 1161 | * the driver for non nested interrupt handling by the |
| 1162 | * dummy function which warns when called. |
| 1163 | */ |
| 1164 | new->handler = irq_nested_primary_handler; |
Thomas Gleixner | 8d32a30 | 2011-02-23 23:52:23 +0000 | [diff] [blame] | 1165 | } else { |
Thomas Gleixner | 2a1d3ab | 2015-09-21 11:01:10 +0200 | [diff] [blame] | 1166 | if (irq_settings_can_thread(desc)) { |
| 1167 | ret = irq_setup_forced_threading(new); |
| 1168 | if (ret) |
| 1169 | goto out_mput; |
| 1170 | } |
Thomas Gleixner | 399b5da | 2009-08-13 13:21:38 +0200 | [diff] [blame] | 1171 | } |
| 1172 | |
| 1173 | /* |
| 1174 | * Create a handler thread when a thread function is supplied |
| 1175 | * and the interrupt does not nest into another interrupt |
| 1176 | * thread. |
| 1177 | */ |
| 1178 | if (new->thread_fn && !nested) { |
Thomas Gleixner | 2a1d3ab | 2015-09-21 11:01:10 +0200 | [diff] [blame] | 1179 | ret = setup_irq_thread(new, irq, false); |
| 1180 | if (ret) |
Sebastian Andrzej Siewior | b687380 | 2011-07-11 12:17:31 +0200 | [diff] [blame] | 1181 | goto out_mput; |
Thomas Gleixner | 2a1d3ab | 2015-09-21 11:01:10 +0200 | [diff] [blame] | 1182 | if (new->secondary) { |
| 1183 | ret = setup_irq_thread(new->secondary, irq, true); |
| 1184 | if (ret) |
| 1185 | goto out_thread; |
Sebastian Andrzej Siewior | b687380 | 2011-07-11 12:17:31 +0200 | [diff] [blame] | 1186 | } |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 1187 | } |
| 1188 | |
Thomas Gleixner | 3b8249e | 2011-02-07 16:02:20 +0100 | [diff] [blame] | 1189 | if (!alloc_cpumask_var(&mask, GFP_KERNEL)) { |
| 1190 | ret = -ENOMEM; |
| 1191 | goto out_thread; |
| 1192 | } |
| 1193 | |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 1194 | /* |
Thomas Gleixner | dc9b229 | 2012-07-13 19:29:45 +0200 | [diff] [blame] | 1195 | * Drivers are often written to work w/o knowledge about the |
| 1196 | * underlying irq chip implementation, so a request for a |
| 1197 | * threaded irq without a primary hard irq context handler |
| 1198 | * requires the ONESHOT flag to be set. Some irq chips like |
| 1199 | * MSI based interrupts are per se one shot safe. Check the |
| 1200 | * chip flags, so we can avoid the unmask dance at the end of |
| 1201 | * the threaded handler for those. |
| 1202 | */ |
| 1203 | if (desc->irq_data.chip->flags & IRQCHIP_ONESHOT_SAFE) |
| 1204 | new->flags &= ~IRQF_ONESHOT; |
| 1205 | |
| 1206 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1207 | * The following block of code has to be executed atomically |
| 1208 | */ |
Thomas Gleixner | 239007b | 2009-11-17 16:46:45 +0100 | [diff] [blame] | 1209 | raw_spin_lock_irqsave(&desc->lock, flags); |
Ingo Molnar | f17c754 | 2009-02-17 20:43:37 +0100 | [diff] [blame] | 1210 | old_ptr = &desc->action; |
| 1211 | old = *old_ptr; |
Ingo Molnar | 06fcb0c | 2006-06-29 02:24:40 -0700 | [diff] [blame] | 1212 | if (old) { |
Thomas Gleixner | e76de9f | 2006-06-29 02:24:56 -0700 | [diff] [blame] | 1213 | /* |
| 1214 | * Can't share interrupts unless both agree to and are |
| 1215 | * the same type (level, edge, polarity). So both flag |
Thomas Gleixner | 3cca53b | 2006-07-01 19:29:31 -0700 | [diff] [blame] | 1216 | * fields must have IRQF_SHARED set and the bits which |
Thomas Gleixner | 9d591ed | 2011-02-23 23:52:16 +0000 | [diff] [blame] | 1217 | * set the trigger type must match. Also all must |
| 1218 | * agree on ONESHOT. |
Thomas Gleixner | e76de9f | 2006-06-29 02:24:56 -0700 | [diff] [blame] | 1219 | */ |
Thomas Gleixner | 3cca53b | 2006-07-01 19:29:31 -0700 | [diff] [blame] | 1220 | if (!((old->flags & new->flags) & IRQF_SHARED) || |
Greg Kroah-Hartman | 6c9ca57 | 2018-03-30 10:53:44 +0200 | [diff] [blame] | 1221 | ((old->flags ^ new->flags) & IRQF_TRIGGER_MASK) || |
Thomas Gleixner | f5d8947 | 2012-04-19 12:06:13 +0200 | [diff] [blame] | 1222 | ((old->flags ^ new->flags) & IRQF_ONESHOT)) |
Dimitri Sivanich | f516342 | 2006-03-25 03:08:23 -0800 | [diff] [blame] | 1223 | goto mismatch; |
| 1224 | |
Dimitri Sivanich | f516342 | 2006-03-25 03:08:23 -0800 | [diff] [blame] | 1225 | /* All handlers must agree on per-cpuness */ |
Thomas Gleixner | 3cca53b | 2006-07-01 19:29:31 -0700 | [diff] [blame] | 1226 | if ((old->flags & IRQF_PERCPU) != |
| 1227 | (new->flags & IRQF_PERCPU)) |
Dimitri Sivanich | f516342 | 2006-03-25 03:08:23 -0800 | [diff] [blame] | 1228 | goto mismatch; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1229 | |
| 1230 | /* add new interrupt at end of irq queue */ |
| 1231 | do { |
Thomas Gleixner | 52abb70 | 2012-03-06 23:18:54 +0100 | [diff] [blame] | 1232 | /* |
| 1233 | * Or all existing action->thread_mask bits, |
| 1234 | * so we can find the next zero bit for this |
| 1235 | * new action. |
| 1236 | */ |
Thomas Gleixner | b5faba2 | 2011-02-23 23:52:13 +0000 | [diff] [blame] | 1237 | thread_mask |= old->thread_mask; |
Ingo Molnar | f17c754 | 2009-02-17 20:43:37 +0100 | [diff] [blame] | 1238 | old_ptr = &old->next; |
| 1239 | old = *old_ptr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1240 | } while (old); |
| 1241 | shared = 1; |
| 1242 | } |
| 1243 | |
Thomas Gleixner | b5faba2 | 2011-02-23 23:52:13 +0000 | [diff] [blame] | 1244 | /* |
Thomas Gleixner | 52abb70 | 2012-03-06 23:18:54 +0100 | [diff] [blame] | 1245 | * Setup the thread mask for this irqaction for ONESHOT. For |
| 1246 | * !ONESHOT irqs the thread mask is 0 so we can avoid a |
| 1247 | * conditional in irq_wake_thread(). |
Thomas Gleixner | b5faba2 | 2011-02-23 23:52:13 +0000 | [diff] [blame] | 1248 | */ |
Thomas Gleixner | 52abb70 | 2012-03-06 23:18:54 +0100 | [diff] [blame] | 1249 | if (new->flags & IRQF_ONESHOT) { |
| 1250 | /* |
| 1251 | * Unlikely to have 32 resp 64 irqs sharing one line, |
| 1252 | * but who knows. |
| 1253 | */ |
| 1254 | if (thread_mask == ~0UL) { |
| 1255 | ret = -EBUSY; |
| 1256 | goto out_mask; |
| 1257 | } |
| 1258 | /* |
| 1259 | * The thread_mask for the action is or'ed to |
| 1260 | * desc->thread_active to indicate that the |
| 1261 | * IRQF_ONESHOT thread handler has been woken, but not |
| 1262 | * yet finished. The bit is cleared when a thread |
| 1263 | * completes. When all threads of a shared interrupt |
| 1264 | * line have completed desc->threads_active becomes |
| 1265 | * zero and the interrupt line is unmasked. See |
| 1266 | * handle.c:irq_wake_thread() for further information. |
| 1267 | * |
| 1268 | * If no thread is woken by primary (hard irq context) |
| 1269 | * interrupt handlers, then desc->threads_active is |
| 1270 | * also checked for zero to unmask the irq line in the |
| 1271 | * affected hard irq flow handlers |
| 1272 | * (handle_[fasteoi|level]_irq). |
| 1273 | * |
| 1274 | * The new action gets the first zero bit of |
| 1275 | * thread_mask assigned. See the loop above which or's |
| 1276 | * all existing action->thread_mask bits. |
| 1277 | */ |
| 1278 | new->thread_mask = 1 << ffz(thread_mask); |
Thomas Gleixner | 1c6c695 | 2012-04-19 10:35:17 +0200 | [diff] [blame] | 1279 | |
Thomas Gleixner | dc9b229 | 2012-07-13 19:29:45 +0200 | [diff] [blame] | 1280 | } else if (new->handler == irq_default_primary_handler && |
| 1281 | !(desc->irq_data.chip->flags & IRQCHIP_ONESHOT_SAFE)) { |
Thomas Gleixner | 1c6c695 | 2012-04-19 10:35:17 +0200 | [diff] [blame] | 1282 | /* |
| 1283 | * The interrupt was requested with handler = NULL, so |
| 1284 | * we use the default primary handler for it. But it |
| 1285 | * does not have the oneshot flag set. In combination |
| 1286 | * with level interrupts this is deadly, because the |
| 1287 | * default primary handler just wakes the thread, then |
| 1288 | * the irq lines is reenabled, but the device still |
| 1289 | * has the level irq asserted. Rinse and repeat.... |
| 1290 | * |
| 1291 | * While this works for edge type interrupts, we play |
| 1292 | * it safe and reject unconditionally because we can't |
| 1293 | * say for sure which type this interrupt really |
| 1294 | * has. The type flags are unreliable as the |
| 1295 | * underlying chip implementation can override them. |
| 1296 | */ |
Andrew Morton | 97fd75b | 2012-05-31 16:26:07 -0700 | [diff] [blame] | 1297 | pr_err("Threaded irq requested with handler=NULL and !ONESHOT for irq %d\n", |
Thomas Gleixner | 1c6c695 | 2012-04-19 10:35:17 +0200 | [diff] [blame] | 1298 | irq); |
| 1299 | ret = -EINVAL; |
| 1300 | goto out_mask; |
Thomas Gleixner | b5faba2 | 2011-02-23 23:52:13 +0000 | [diff] [blame] | 1301 | } |
Thomas Gleixner | b5faba2 | 2011-02-23 23:52:13 +0000 | [diff] [blame] | 1302 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1303 | if (!shared) { |
Thomas Gleixner | c1bacba | 2014-03-08 08:59:58 +0100 | [diff] [blame] | 1304 | ret = irq_request_resources(desc); |
| 1305 | if (ret) { |
| 1306 | pr_err("Failed to request resources for %s (irq %d) on irqchip %s\n", |
| 1307 | new->name, irq, desc->irq_data.chip->name); |
| 1308 | goto out_mask; |
| 1309 | } |
| 1310 | |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 1311 | init_waitqueue_head(&desc->wait_for_threads); |
| 1312 | |
Uwe Kleine-König | 82736f4 | 2008-07-23 21:28:54 -0700 | [diff] [blame] | 1313 | /* Setup the type (level, edge polarity) if configured: */ |
| 1314 | if (new->flags & IRQF_TRIGGER_MASK) { |
Jiang Liu | a1ff541 | 2015-06-23 19:47:29 +0200 | [diff] [blame] | 1315 | ret = __irq_set_trigger(desc, |
| 1316 | new->flags & IRQF_TRIGGER_MASK); |
Uwe Kleine-König | 82736f4 | 2008-07-23 21:28:54 -0700 | [diff] [blame] | 1317 | |
Heiner Kallweit | 7662832 | 2017-06-11 00:38:36 +0200 | [diff] [blame] | 1318 | if (ret) { |
| 1319 | irq_release_resources(desc); |
Thomas Gleixner | 3b8249e | 2011-02-07 16:02:20 +0100 | [diff] [blame] | 1320 | goto out_mask; |
Heiner Kallweit | 7662832 | 2017-06-11 00:38:36 +0200 | [diff] [blame] | 1321 | } |
Thomas Gleixner | 091738a | 2011-02-14 20:16:43 +0100 | [diff] [blame] | 1322 | } |
Ahmed S. Darwish | f75d222 | 2007-05-08 00:27:55 -0700 | [diff] [blame] | 1323 | |
Thomas Gleixner | 009b4c3 | 2011-02-07 21:48:49 +0100 | [diff] [blame] | 1324 | desc->istate &= ~(IRQS_AUTODETECT | IRQS_SPURIOUS_DISABLED | \ |
Thomas Gleixner | 32f4125 | 2011-03-28 14:10:52 +0200 | [diff] [blame] | 1325 | IRQS_ONESHOT | IRQS_WAITING); |
| 1326 | irqd_clear(&desc->irq_data, IRQD_IRQ_INPROGRESS); |
Thomas Gleixner | 94d39e1 | 2006-06-29 02:24:50 -0700 | [diff] [blame] | 1327 | |
Thomas Gleixner | a005677 | 2011-02-08 17:11:03 +0100 | [diff] [blame] | 1328 | if (new->flags & IRQF_PERCPU) { |
| 1329 | irqd_set(&desc->irq_data, IRQD_PER_CPU); |
| 1330 | irq_settings_set_per_cpu(desc); |
| 1331 | } |
Thomas Gleixner | 6a58fb3 | 2011-02-08 15:40:05 +0100 | [diff] [blame] | 1332 | |
Thomas Gleixner | b25c340 | 2009-08-13 12:17:22 +0200 | [diff] [blame] | 1333 | if (new->flags & IRQF_ONESHOT) |
Thomas Gleixner | 3d67bae | 2011-02-07 21:02:10 +0100 | [diff] [blame] | 1334 | desc->istate |= IRQS_ONESHOT; |
Thomas Gleixner | b25c340 | 2009-08-13 12:17:22 +0200 | [diff] [blame] | 1335 | |
Thomas Gleixner | 1ccb4e6 | 2011-02-09 14:44:17 +0100 | [diff] [blame] | 1336 | if (irq_settings_can_autoenable(desc)) |
Thomas Gleixner | b4bc724 | 2012-02-08 11:57:52 +0100 | [diff] [blame] | 1337 | irq_startup(desc, true); |
Thomas Gleixner | 4699923 | 2011-02-02 21:41:14 +0000 | [diff] [blame] | 1338 | else |
Thomas Gleixner | e76de9f | 2006-06-29 02:24:56 -0700 | [diff] [blame] | 1339 | /* Undo nested disables: */ |
| 1340 | desc->depth = 1; |
Max Krasnyansky | 1840475 | 2008-05-29 11:02:52 -0700 | [diff] [blame] | 1341 | |
Thomas Gleixner | 612e368 | 2008-11-07 13:58:46 +0100 | [diff] [blame] | 1342 | /* Exclude IRQ from balancing if requested */ |
Thomas Gleixner | a005677 | 2011-02-08 17:11:03 +0100 | [diff] [blame] | 1343 | if (new->flags & IRQF_NOBALANCING) { |
| 1344 | irq_settings_set_no_balancing(desc); |
| 1345 | irqd_set(&desc->irq_data, IRQD_NO_BALANCING); |
| 1346 | } |
Thomas Gleixner | 612e368 | 2008-11-07 13:58:46 +0100 | [diff] [blame] | 1347 | |
Max Krasnyansky | 1840475 | 2008-05-29 11:02:52 -0700 | [diff] [blame] | 1348 | /* Set default affinity mask once everything is setup */ |
Jiang Liu | a8a98ea | 2015-06-04 12:13:30 +0800 | [diff] [blame] | 1349 | setup_affinity(desc, mask); |
David Brownell | 0c5d1eb | 2008-10-01 14:46:18 -0700 | [diff] [blame] | 1350 | |
Thomas Gleixner | 876dbd4 | 2011-02-08 17:28:12 +0100 | [diff] [blame] | 1351 | } else if (new->flags & IRQF_TRIGGER_MASK) { |
| 1352 | unsigned int nmsk = new->flags & IRQF_TRIGGER_MASK; |
Thomas Gleixner | 7ee7e87 | 2016-11-07 19:57:00 +0100 | [diff] [blame] | 1353 | unsigned int omsk = irqd_get_trigger_type(&desc->irq_data); |
Thomas Gleixner | 876dbd4 | 2011-02-08 17:28:12 +0100 | [diff] [blame] | 1354 | |
| 1355 | if (nmsk != omsk) |
| 1356 | /* hope the handler works with current trigger mode */ |
Joe Perches | a395d6a | 2016-03-22 14:28:09 -0700 | [diff] [blame] | 1357 | pr_warn("irq %d uses trigger mode %u; requested %u\n", |
Thomas Gleixner | 7ee7e87 | 2016-11-07 19:57:00 +0100 | [diff] [blame] | 1358 | irq, omsk, nmsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1359 | } |
Uwe Kleine-König | 82736f4 | 2008-07-23 21:28:54 -0700 | [diff] [blame] | 1360 | |
Ingo Molnar | f17c754 | 2009-02-17 20:43:37 +0100 | [diff] [blame] | 1361 | *old_ptr = new; |
Uwe Kleine-König | 82736f4 | 2008-07-23 21:28:54 -0700 | [diff] [blame] | 1362 | |
Thomas Gleixner | cab303b | 2014-08-28 11:44:31 +0200 | [diff] [blame] | 1363 | irq_pm_install_action(desc, new); |
| 1364 | |
Linus Torvalds | 8528b0f | 2007-01-23 14:16:31 -0800 | [diff] [blame] | 1365 | /* Reset broken irq detection when installing new handler */ |
| 1366 | desc->irq_count = 0; |
| 1367 | desc->irqs_unhandled = 0; |
Thomas Gleixner | 1adb085 | 2008-04-28 17:01:56 +0200 | [diff] [blame] | 1368 | |
| 1369 | /* |
| 1370 | * Check whether we disabled the irq via the spurious handler |
| 1371 | * before. Reenable it and give it another chance. |
| 1372 | */ |
Thomas Gleixner | 7acdd53 | 2011-02-07 20:40:54 +0100 | [diff] [blame] | 1373 | if (shared && (desc->istate & IRQS_SPURIOUS_DISABLED)) { |
| 1374 | desc->istate &= ~IRQS_SPURIOUS_DISABLED; |
Jiang Liu | 79ff1cd | 2015-06-23 19:52:36 +0200 | [diff] [blame] | 1375 | __enable_irq(desc); |
Thomas Gleixner | 1adb085 | 2008-04-28 17:01:56 +0200 | [diff] [blame] | 1376 | } |
| 1377 | |
Thomas Gleixner | 239007b | 2009-11-17 16:46:45 +0100 | [diff] [blame] | 1378 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1379 | |
Thomas Gleixner | 69ab849 | 2009-08-17 14:07:16 +0200 | [diff] [blame] | 1380 | /* |
| 1381 | * Strictly no need to wake it up, but hung_task complains |
| 1382 | * when no hard interrupt wakes the thread up. |
| 1383 | */ |
| 1384 | if (new->thread) |
| 1385 | wake_up_process(new->thread); |
Thomas Gleixner | 2a1d3ab | 2015-09-21 11:01:10 +0200 | [diff] [blame] | 1386 | if (new->secondary) |
| 1387 | wake_up_process(new->secondary->thread); |
Thomas Gleixner | 69ab849 | 2009-08-17 14:07:16 +0200 | [diff] [blame] | 1388 | |
Yinghai Lu | 2c6927a | 2008-08-19 20:50:11 -0700 | [diff] [blame] | 1389 | register_irq_proc(irq, desc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1390 | new->dir = NULL; |
| 1391 | register_handler_proc(irq, new); |
Xiaotian Feng | 4f5058c | 2011-04-02 19:39:35 +0800 | [diff] [blame] | 1392 | free_cpumask_var(mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1393 | |
| 1394 | return 0; |
Dimitri Sivanich | f516342 | 2006-03-25 03:08:23 -0800 | [diff] [blame] | 1395 | |
| 1396 | mismatch: |
Thomas Gleixner | 3cca53b | 2006-07-01 19:29:31 -0700 | [diff] [blame] | 1397 | if (!(new->flags & IRQF_PROBE_SHARED)) { |
Andrew Morton | 97fd75b | 2012-05-31 16:26:07 -0700 | [diff] [blame] | 1398 | pr_err("Flags mismatch irq %d. %08x (%s) vs. %08x (%s)\n", |
Thomas Gleixner | f5d8947 | 2012-04-19 12:06:13 +0200 | [diff] [blame] | 1399 | irq, new->flags, new->name, old->flags, old->name); |
| 1400 | #ifdef CONFIG_DEBUG_SHIRQ |
Andrew Morton | 13e87ec | 2006-04-27 18:39:18 -0700 | [diff] [blame] | 1401 | dump_stack(); |
Alan Cox | 3f05044 | 2007-02-12 00:52:04 -0800 | [diff] [blame] | 1402 | #endif |
Thomas Gleixner | f5d8947 | 2012-04-19 12:06:13 +0200 | [diff] [blame] | 1403 | } |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 1404 | ret = -EBUSY; |
| 1405 | |
Thomas Gleixner | 3b8249e | 2011-02-07 16:02:20 +0100 | [diff] [blame] | 1406 | out_mask: |
Dan Carpenter | 1c38979 | 2011-03-17 14:43:07 +0300 | [diff] [blame] | 1407 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
Thomas Gleixner | 3b8249e | 2011-02-07 16:02:20 +0100 | [diff] [blame] | 1408 | free_cpumask_var(mask); |
| 1409 | |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 1410 | out_thread: |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 1411 | if (new->thread) { |
| 1412 | struct task_struct *t = new->thread; |
| 1413 | |
| 1414 | new->thread = NULL; |
Alexander Gordeev | 05d74ef | 2012-03-09 14:59:40 +0100 | [diff] [blame] | 1415 | kthread_stop(t); |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 1416 | put_task_struct(t); |
| 1417 | } |
Thomas Gleixner | 2a1d3ab | 2015-09-21 11:01:10 +0200 | [diff] [blame] | 1418 | if (new->secondary && new->secondary->thread) { |
| 1419 | struct task_struct *t = new->secondary->thread; |
| 1420 | |
| 1421 | new->secondary->thread = NULL; |
| 1422 | kthread_stop(t); |
| 1423 | put_task_struct(t); |
| 1424 | } |
Sebastian Andrzej Siewior | b687380 | 2011-07-11 12:17:31 +0200 | [diff] [blame] | 1425 | out_mput: |
| 1426 | module_put(desc->owner); |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 1427 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1428 | } |
| 1429 | |
| 1430 | /** |
Thomas Gleixner | d3c6004 | 2008-10-16 09:55:00 +0200 | [diff] [blame] | 1431 | * setup_irq - setup an interrupt |
| 1432 | * @irq: Interrupt line to setup |
| 1433 | * @act: irqaction for the interrupt |
| 1434 | * |
| 1435 | * Used to statically setup interrupts in the early boot process. |
| 1436 | */ |
| 1437 | int setup_irq(unsigned int irq, struct irqaction *act) |
| 1438 | { |
David Daney | 986c011 | 2011-02-09 16:04:25 -0800 | [diff] [blame] | 1439 | int retval; |
Thomas Gleixner | d3c6004 | 2008-10-16 09:55:00 +0200 | [diff] [blame] | 1440 | struct irq_desc *desc = irq_to_desc(irq); |
| 1441 | |
Jon Hunter | 9b5d585 | 2016-05-10 16:14:35 +0100 | [diff] [blame] | 1442 | if (!desc || WARN_ON(irq_settings_is_per_cpu_devid(desc))) |
Marc Zyngier | 31d9d9b | 2011-09-23 17:03:06 +0100 | [diff] [blame] | 1443 | return -EINVAL; |
Jon Hunter | be45beb | 2016-06-07 16:12:29 +0100 | [diff] [blame] | 1444 | |
| 1445 | retval = irq_chip_pm_get(&desc->irq_data); |
| 1446 | if (retval < 0) |
| 1447 | return retval; |
| 1448 | |
David Daney | 986c011 | 2011-02-09 16:04:25 -0800 | [diff] [blame] | 1449 | chip_bus_lock(desc); |
| 1450 | retval = __setup_irq(irq, desc, act); |
| 1451 | chip_bus_sync_unlock(desc); |
| 1452 | |
Jon Hunter | be45beb | 2016-06-07 16:12:29 +0100 | [diff] [blame] | 1453 | if (retval) |
| 1454 | irq_chip_pm_put(&desc->irq_data); |
| 1455 | |
David Daney | 986c011 | 2011-02-09 16:04:25 -0800 | [diff] [blame] | 1456 | return retval; |
Thomas Gleixner | d3c6004 | 2008-10-16 09:55:00 +0200 | [diff] [blame] | 1457 | } |
Magnus Damm | eb53b4e | 2009-03-12 21:05:59 +0900 | [diff] [blame] | 1458 | EXPORT_SYMBOL_GPL(setup_irq); |
Thomas Gleixner | d3c6004 | 2008-10-16 09:55:00 +0200 | [diff] [blame] | 1459 | |
Marc Zyngier | 31d9d9b | 2011-09-23 17:03:06 +0100 | [diff] [blame] | 1460 | /* |
Magnus Damm | cbf94f0 | 2009-03-12 21:05:51 +0900 | [diff] [blame] | 1461 | * Internal function to unregister an irqaction - used to free |
| 1462 | * regular and special interrupts that are part of the architecture. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1463 | */ |
Magnus Damm | cbf94f0 | 2009-03-12 21:05:51 +0900 | [diff] [blame] | 1464 | static struct irqaction *__free_irq(unsigned int irq, void *dev_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1465 | { |
Thomas Gleixner | d3c6004 | 2008-10-16 09:55:00 +0200 | [diff] [blame] | 1466 | struct irq_desc *desc = irq_to_desc(irq); |
Ingo Molnar | f17c754 | 2009-02-17 20:43:37 +0100 | [diff] [blame] | 1467 | struct irqaction *action, **action_ptr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1468 | unsigned long flags; |
| 1469 | |
Ingo Molnar | ae88a23 | 2009-02-15 11:29:50 +0100 | [diff] [blame] | 1470 | WARN(in_interrupt(), "Trying to free IRQ %d from IRQ context!\n", irq); |
Yinghai Lu | 7d94f7c | 2008-08-19 20:50:14 -0700 | [diff] [blame] | 1471 | |
Yinghai Lu | 7d94f7c | 2008-08-19 20:50:14 -0700 | [diff] [blame] | 1472 | if (!desc) |
Magnus Damm | f21cfb2 | 2009-03-12 21:05:42 +0900 | [diff] [blame] | 1473 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1474 | |
Thomas Gleixner | abc7e40 | 2015-12-13 18:12:30 +0100 | [diff] [blame] | 1475 | chip_bus_lock(desc); |
Thomas Gleixner | 239007b | 2009-11-17 16:46:45 +0100 | [diff] [blame] | 1476 | raw_spin_lock_irqsave(&desc->lock, flags); |
Ingo Molnar | ae88a23 | 2009-02-15 11:29:50 +0100 | [diff] [blame] | 1477 | |
| 1478 | /* |
| 1479 | * There can be multiple actions per IRQ descriptor, find the right |
| 1480 | * one based on the dev_id: |
| 1481 | */ |
Ingo Molnar | f17c754 | 2009-02-17 20:43:37 +0100 | [diff] [blame] | 1482 | action_ptr = &desc->action; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1483 | for (;;) { |
Ingo Molnar | f17c754 | 2009-02-17 20:43:37 +0100 | [diff] [blame] | 1484 | action = *action_ptr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1485 | |
Ingo Molnar | ae88a23 | 2009-02-15 11:29:50 +0100 | [diff] [blame] | 1486 | if (!action) { |
| 1487 | WARN(1, "Trying to free already-free IRQ %d\n", irq); |
Thomas Gleixner | 239007b | 2009-11-17 16:46:45 +0100 | [diff] [blame] | 1488 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
Thomas Gleixner | abc7e40 | 2015-12-13 18:12:30 +0100 | [diff] [blame] | 1489 | chip_bus_sync_unlock(desc); |
Magnus Damm | f21cfb2 | 2009-03-12 21:05:42 +0900 | [diff] [blame] | 1490 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1491 | } |
Ingo Molnar | ae88a23 | 2009-02-15 11:29:50 +0100 | [diff] [blame] | 1492 | |
Ingo Molnar | 8316e38 | 2009-02-17 20:28:29 +0100 | [diff] [blame] | 1493 | if (action->dev_id == dev_id) |
| 1494 | break; |
Ingo Molnar | f17c754 | 2009-02-17 20:43:37 +0100 | [diff] [blame] | 1495 | action_ptr = &action->next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1496 | } |
Ingo Molnar | ae88a23 | 2009-02-15 11:29:50 +0100 | [diff] [blame] | 1497 | |
| 1498 | /* Found it - now remove it from the list of entries: */ |
Ingo Molnar | f17c754 | 2009-02-17 20:43:37 +0100 | [diff] [blame] | 1499 | *action_ptr = action->next; |
Ingo Molnar | ae88a23 | 2009-02-15 11:29:50 +0100 | [diff] [blame] | 1500 | |
Thomas Gleixner | cab303b | 2014-08-28 11:44:31 +0200 | [diff] [blame] | 1501 | irq_pm_remove_action(desc, action); |
| 1502 | |
Ingo Molnar | ae88a23 | 2009-02-15 11:29:50 +0100 | [diff] [blame] | 1503 | /* If this was the last handler, shut down the IRQ line: */ |
Thomas Gleixner | c1bacba | 2014-03-08 08:59:58 +0100 | [diff] [blame] | 1504 | if (!desc->action) { |
Thomas Gleixner | e984977 | 2015-10-09 23:28:58 +0200 | [diff] [blame] | 1505 | irq_settings_clr_disable_unlazy(desc); |
Thomas Gleixner | 4699923 | 2011-02-02 21:41:14 +0000 | [diff] [blame] | 1506 | irq_shutdown(desc); |
Thomas Gleixner | c1bacba | 2014-03-08 08:59:58 +0100 | [diff] [blame] | 1507 | irq_release_resources(desc); |
| 1508 | } |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 1509 | |
Peter P Waskiewicz Jr | e7a297b | 2010-04-30 14:44:50 -0700 | [diff] [blame] | 1510 | #ifdef CONFIG_SMP |
| 1511 | /* make sure affinity_hint is cleaned up */ |
| 1512 | if (WARN_ON_ONCE(desc->affinity_hint)) |
| 1513 | desc->affinity_hint = NULL; |
| 1514 | #endif |
| 1515 | |
Thomas Gleixner | 239007b | 2009-11-17 16:46:45 +0100 | [diff] [blame] | 1516 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
Thomas Gleixner | abc7e40 | 2015-12-13 18:12:30 +0100 | [diff] [blame] | 1517 | chip_bus_sync_unlock(desc); |
Ingo Molnar | ae88a23 | 2009-02-15 11:29:50 +0100 | [diff] [blame] | 1518 | |
| 1519 | unregister_handler_proc(irq, action); |
| 1520 | |
| 1521 | /* Make sure it's not being used on another CPU: */ |
| 1522 | synchronize_irq(irq); |
| 1523 | |
| 1524 | #ifdef CONFIG_DEBUG_SHIRQ |
| 1525 | /* |
| 1526 | * It's a shared IRQ -- the driver ought to be prepared for an IRQ |
| 1527 | * event to happen even now it's being freed, so let's make sure that |
| 1528 | * is so by doing an extra call to the handler .... |
| 1529 | * |
| 1530 | * ( We do this after actually deregistering it, to make sure that a |
| 1531 | * 'real' IRQ doesn't run in * parallel with our fake. ) |
| 1532 | */ |
| 1533 | if (action->flags & IRQF_SHARED) { |
| 1534 | local_irq_save(flags); |
| 1535 | action->handler(irq, dev_id); |
| 1536 | local_irq_restore(flags); |
| 1537 | } |
| 1538 | #endif |
Linus Torvalds | 2d860ad | 2009-08-13 13:05:10 -0700 | [diff] [blame] | 1539 | |
| 1540 | if (action->thread) { |
Alexander Gordeev | 05d74ef | 2012-03-09 14:59:40 +0100 | [diff] [blame] | 1541 | kthread_stop(action->thread); |
Linus Torvalds | 2d860ad | 2009-08-13 13:05:10 -0700 | [diff] [blame] | 1542 | put_task_struct(action->thread); |
Thomas Gleixner | 2a1d3ab | 2015-09-21 11:01:10 +0200 | [diff] [blame] | 1543 | if (action->secondary && action->secondary->thread) { |
| 1544 | kthread_stop(action->secondary->thread); |
| 1545 | put_task_struct(action->secondary->thread); |
| 1546 | } |
Linus Torvalds | 2d860ad | 2009-08-13 13:05:10 -0700 | [diff] [blame] | 1547 | } |
| 1548 | |
Jon Hunter | be45beb | 2016-06-07 16:12:29 +0100 | [diff] [blame] | 1549 | irq_chip_pm_put(&desc->irq_data); |
Sebastian Andrzej Siewior | b687380 | 2011-07-11 12:17:31 +0200 | [diff] [blame] | 1550 | module_put(desc->owner); |
Thomas Gleixner | 2a1d3ab | 2015-09-21 11:01:10 +0200 | [diff] [blame] | 1551 | kfree(action->secondary); |
Magnus Damm | f21cfb2 | 2009-03-12 21:05:42 +0900 | [diff] [blame] | 1552 | return action; |
| 1553 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1554 | |
| 1555 | /** |
Magnus Damm | cbf94f0 | 2009-03-12 21:05:51 +0900 | [diff] [blame] | 1556 | * remove_irq - free an interrupt |
| 1557 | * @irq: Interrupt line to free |
| 1558 | * @act: irqaction for the interrupt |
| 1559 | * |
| 1560 | * Used to remove interrupts statically setup by the early boot process. |
| 1561 | */ |
| 1562 | void remove_irq(unsigned int irq, struct irqaction *act) |
| 1563 | { |
Marc Zyngier | 31d9d9b | 2011-09-23 17:03:06 +0100 | [diff] [blame] | 1564 | struct irq_desc *desc = irq_to_desc(irq); |
| 1565 | |
| 1566 | if (desc && !WARN_ON(irq_settings_is_per_cpu_devid(desc))) |
| 1567 | __free_irq(irq, act->dev_id); |
Magnus Damm | cbf94f0 | 2009-03-12 21:05:51 +0900 | [diff] [blame] | 1568 | } |
Magnus Damm | eb53b4e | 2009-03-12 21:05:59 +0900 | [diff] [blame] | 1569 | EXPORT_SYMBOL_GPL(remove_irq); |
Magnus Damm | cbf94f0 | 2009-03-12 21:05:51 +0900 | [diff] [blame] | 1570 | |
| 1571 | /** |
Magnus Damm | f21cfb2 | 2009-03-12 21:05:42 +0900 | [diff] [blame] | 1572 | * free_irq - free an interrupt allocated with request_irq |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1573 | * @irq: Interrupt line to free |
| 1574 | * @dev_id: Device identity to free |
| 1575 | * |
| 1576 | * Remove an interrupt handler. The handler is removed and if the |
| 1577 | * interrupt line is no longer in use by any driver it is disabled. |
| 1578 | * On a shared IRQ the caller must ensure the interrupt is disabled |
| 1579 | * on the card it drives before calling this function. The function |
| 1580 | * does not return until any executing interrupts for this IRQ |
| 1581 | * have completed. |
| 1582 | * |
| 1583 | * This function must not be called from interrupt context. |
| 1584 | */ |
| 1585 | void free_irq(unsigned int irq, void *dev_id) |
| 1586 | { |
Thomas Gleixner | 70aedd2 | 2009-08-13 12:17:48 +0200 | [diff] [blame] | 1587 | struct irq_desc *desc = irq_to_desc(irq); |
| 1588 | |
Marc Zyngier | 31d9d9b | 2011-09-23 17:03:06 +0100 | [diff] [blame] | 1589 | if (!desc || WARN_ON(irq_settings_is_per_cpu_devid(desc))) |
Thomas Gleixner | 70aedd2 | 2009-08-13 12:17:48 +0200 | [diff] [blame] | 1590 | return; |
| 1591 | |
Ben Hutchings | cd7eab4 | 2011-01-19 21:01:44 +0000 | [diff] [blame] | 1592 | #ifdef CONFIG_SMP |
| 1593 | if (WARN_ON(desc->affinity_notify)) |
| 1594 | desc->affinity_notify = NULL; |
| 1595 | #endif |
| 1596 | |
Magnus Damm | cbf94f0 | 2009-03-12 21:05:51 +0900 | [diff] [blame] | 1597 | kfree(__free_irq(irq, dev_id)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1598 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1599 | EXPORT_SYMBOL(free_irq); |
| 1600 | |
| 1601 | /** |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 1602 | * request_threaded_irq - allocate an interrupt line |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1603 | * @irq: Interrupt line to allocate |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 1604 | * @handler: Function to be called when the IRQ occurs. |
| 1605 | * Primary handler for threaded interrupts |
Thomas Gleixner | b25c340 | 2009-08-13 12:17:22 +0200 | [diff] [blame] | 1606 | * If NULL and thread_fn != NULL the default |
| 1607 | * primary handler is installed |
Thomas Gleixner | f48fe81 | 2009-03-24 11:46:22 +0100 | [diff] [blame] | 1608 | * @thread_fn: Function called from the irq handler thread |
| 1609 | * If NULL, no irq thread is created |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1610 | * @irqflags: Interrupt type flags |
| 1611 | * @devname: An ascii name for the claiming device |
| 1612 | * @dev_id: A cookie passed back to the handler function |
| 1613 | * |
| 1614 | * This call allocates interrupt resources and enables the |
| 1615 | * interrupt line and IRQ handling. From the point this |
| 1616 | * call is made your handler function may be invoked. Since |
| 1617 | * your handler function must clear any interrupt the board |
| 1618 | * raises, you must take care both to initialise your hardware |
| 1619 | * and to set up the interrupt handler in the right order. |
| 1620 | * |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 1621 | * If you want to set up a threaded irq handler for your device |
Javi Merino | 6d21af4 | 2011-10-26 10:16:11 +0100 | [diff] [blame] | 1622 | * then you need to supply @handler and @thread_fn. @handler is |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 1623 | * still called in hard interrupt context and has to check |
| 1624 | * whether the interrupt originates from the device. If yes it |
| 1625 | * needs to disable the interrupt on the device and return |
Steven Rostedt | 39a2edd | 2009-05-12 14:35:54 -0400 | [diff] [blame] | 1626 | * IRQ_WAKE_THREAD which will wake up the handler thread and run |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 1627 | * @thread_fn. This split handler design is necessary to support |
| 1628 | * shared interrupts. |
| 1629 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1630 | * Dev_id must be globally unique. Normally the address of the |
| 1631 | * device data structure is used as the cookie. Since the handler |
| 1632 | * receives this value it makes sense to use it. |
| 1633 | * |
| 1634 | * If your interrupt is shared you must pass a non NULL dev_id |
| 1635 | * as this is required when freeing the interrupt. |
| 1636 | * |
| 1637 | * Flags: |
| 1638 | * |
Thomas Gleixner | 3cca53b | 2006-07-01 19:29:31 -0700 | [diff] [blame] | 1639 | * IRQF_SHARED Interrupt is shared |
David Brownell | 0c5d1eb | 2008-10-01 14:46:18 -0700 | [diff] [blame] | 1640 | * IRQF_TRIGGER_* Specify active edge(s) or level |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1641 | * |
| 1642 | */ |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 1643 | int request_threaded_irq(unsigned int irq, irq_handler_t handler, |
| 1644 | irq_handler_t thread_fn, unsigned long irqflags, |
| 1645 | const char *devname, void *dev_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1646 | { |
Ingo Molnar | 06fcb0c | 2006-06-29 02:24:40 -0700 | [diff] [blame] | 1647 | struct irqaction *action; |
Yinghai Lu | 08678b0 | 2008-08-19 20:50:05 -0700 | [diff] [blame] | 1648 | struct irq_desc *desc; |
Thomas Gleixner | d3c6004 | 2008-10-16 09:55:00 +0200 | [diff] [blame] | 1649 | int retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1650 | |
Chen Fan | e237a55 | 2016-02-15 12:52:01 +0800 | [diff] [blame] | 1651 | if (irq == IRQ_NOTCONNECTED) |
| 1652 | return -ENOTCONN; |
| 1653 | |
David Brownell | 470c662 | 2008-12-01 14:31:37 -0800 | [diff] [blame] | 1654 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1655 | * Sanity-check: shared interrupts must pass in a real dev-ID, |
| 1656 | * otherwise we'll have trouble later trying to figure out |
| 1657 | * which interrupt is which (messes up the interrupt freeing |
| 1658 | * logic etc). |
Rafael J. Wysocki | 17f4803 | 2015-02-27 00:07:55 +0100 | [diff] [blame] | 1659 | * |
| 1660 | * Also IRQF_COND_SUSPEND only makes sense for shared interrupts and |
| 1661 | * it cannot be set along with IRQF_NO_SUSPEND. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1662 | */ |
Rafael J. Wysocki | 17f4803 | 2015-02-27 00:07:55 +0100 | [diff] [blame] | 1663 | if (((irqflags & IRQF_SHARED) && !dev_id) || |
| 1664 | (!(irqflags & IRQF_SHARED) && (irqflags & IRQF_COND_SUSPEND)) || |
| 1665 | ((irqflags & IRQF_NO_SUSPEND) && (irqflags & IRQF_COND_SUSPEND))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1666 | return -EINVAL; |
Yinghai Lu | 7d94f7c | 2008-08-19 20:50:14 -0700 | [diff] [blame] | 1667 | |
Yinghai Lu | cb5bc83 | 2008-08-19 20:50:17 -0700 | [diff] [blame] | 1668 | desc = irq_to_desc(irq); |
Yinghai Lu | 7d94f7c | 2008-08-19 20:50:14 -0700 | [diff] [blame] | 1669 | if (!desc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1670 | return -EINVAL; |
Yinghai Lu | 7d94f7c | 2008-08-19 20:50:14 -0700 | [diff] [blame] | 1671 | |
Marc Zyngier | 31d9d9b | 2011-09-23 17:03:06 +0100 | [diff] [blame] | 1672 | if (!irq_settings_can_request(desc) || |
| 1673 | WARN_ON(irq_settings_is_per_cpu_devid(desc))) |
Thomas Gleixner | 6550c77 | 2006-06-29 02:24:49 -0700 | [diff] [blame] | 1674 | return -EINVAL; |
Thomas Gleixner | b25c340 | 2009-08-13 12:17:22 +0200 | [diff] [blame] | 1675 | |
| 1676 | if (!handler) { |
| 1677 | if (!thread_fn) |
| 1678 | return -EINVAL; |
| 1679 | handler = irq_default_primary_handler; |
| 1680 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1681 | |
Thomas Gleixner | 4553573 | 2009-02-22 23:00:32 +0100 | [diff] [blame] | 1682 | action = kzalloc(sizeof(struct irqaction), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1683 | if (!action) |
| 1684 | return -ENOMEM; |
| 1685 | |
| 1686 | action->handler = handler; |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 1687 | action->thread_fn = thread_fn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1688 | action->flags = irqflags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1689 | action->name = devname; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1690 | action->dev_id = dev_id; |
| 1691 | |
Jon Hunter | be45beb | 2016-06-07 16:12:29 +0100 | [diff] [blame] | 1692 | retval = irq_chip_pm_get(&desc->irq_data); |
Shawn Lin | 4396f46 | 2016-08-22 16:21:52 +0800 | [diff] [blame] | 1693 | if (retval < 0) { |
| 1694 | kfree(action); |
Jon Hunter | be45beb | 2016-06-07 16:12:29 +0100 | [diff] [blame] | 1695 | return retval; |
Shawn Lin | 4396f46 | 2016-08-22 16:21:52 +0800 | [diff] [blame] | 1696 | } |
Jon Hunter | be45beb | 2016-06-07 16:12:29 +0100 | [diff] [blame] | 1697 | |
Thomas Gleixner | 3876ec9 | 2010-09-27 12:44:35 +0000 | [diff] [blame] | 1698 | chip_bus_lock(desc); |
Thomas Gleixner | d3c6004 | 2008-10-16 09:55:00 +0200 | [diff] [blame] | 1699 | retval = __setup_irq(irq, desc, action); |
Thomas Gleixner | 3876ec9 | 2010-09-27 12:44:35 +0000 | [diff] [blame] | 1700 | chip_bus_sync_unlock(desc); |
Thomas Gleixner | 70aedd2 | 2009-08-13 12:17:48 +0200 | [diff] [blame] | 1701 | |
Thomas Gleixner | 2a1d3ab | 2015-09-21 11:01:10 +0200 | [diff] [blame] | 1702 | if (retval) { |
Jon Hunter | be45beb | 2016-06-07 16:12:29 +0100 | [diff] [blame] | 1703 | irq_chip_pm_put(&desc->irq_data); |
Thomas Gleixner | 2a1d3ab | 2015-09-21 11:01:10 +0200 | [diff] [blame] | 1704 | kfree(action->secondary); |
Anton Vorontsov | 377bf1e | 2008-08-21 22:58:28 +0400 | [diff] [blame] | 1705 | kfree(action); |
Thomas Gleixner | 2a1d3ab | 2015-09-21 11:01:10 +0200 | [diff] [blame] | 1706 | } |
Anton Vorontsov | 377bf1e | 2008-08-21 22:58:28 +0400 | [diff] [blame] | 1707 | |
Thomas Gleixner | 6d83f94 | 2011-02-18 23:27:23 +0100 | [diff] [blame] | 1708 | #ifdef CONFIG_DEBUG_SHIRQ_FIXME |
Luis Henriques | 6ce51c4 | 2009-04-01 18:06:35 +0100 | [diff] [blame] | 1709 | if (!retval && (irqflags & IRQF_SHARED)) { |
David Woodhouse | a304e1b | 2007-02-12 00:52:00 -0800 | [diff] [blame] | 1710 | /* |
| 1711 | * It's a shared IRQ -- the driver ought to be prepared for it |
| 1712 | * to happen immediately, so let's make sure.... |
Anton Vorontsov | 377bf1e | 2008-08-21 22:58:28 +0400 | [diff] [blame] | 1713 | * We disable the irq to make sure that a 'real' IRQ doesn't |
| 1714 | * run in parallel with our fake. |
David Woodhouse | a304e1b | 2007-02-12 00:52:00 -0800 | [diff] [blame] | 1715 | */ |
Jarek Poplawski | 59845b1 | 2007-08-30 23:56:34 -0700 | [diff] [blame] | 1716 | unsigned long flags; |
David Woodhouse | a304e1b | 2007-02-12 00:52:00 -0800 | [diff] [blame] | 1717 | |
Anton Vorontsov | 377bf1e | 2008-08-21 22:58:28 +0400 | [diff] [blame] | 1718 | disable_irq(irq); |
Jarek Poplawski | 59845b1 | 2007-08-30 23:56:34 -0700 | [diff] [blame] | 1719 | local_irq_save(flags); |
Anton Vorontsov | 377bf1e | 2008-08-21 22:58:28 +0400 | [diff] [blame] | 1720 | |
Jarek Poplawski | 59845b1 | 2007-08-30 23:56:34 -0700 | [diff] [blame] | 1721 | handler(irq, dev_id); |
Anton Vorontsov | 377bf1e | 2008-08-21 22:58:28 +0400 | [diff] [blame] | 1722 | |
Jarek Poplawski | 59845b1 | 2007-08-30 23:56:34 -0700 | [diff] [blame] | 1723 | local_irq_restore(flags); |
Anton Vorontsov | 377bf1e | 2008-08-21 22:58:28 +0400 | [diff] [blame] | 1724 | enable_irq(irq); |
David Woodhouse | a304e1b | 2007-02-12 00:52:00 -0800 | [diff] [blame] | 1725 | } |
| 1726 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1727 | return retval; |
| 1728 | } |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 1729 | EXPORT_SYMBOL(request_threaded_irq); |
Marc Zyngier | ae731f8 | 2010-03-15 22:56:33 +0000 | [diff] [blame] | 1730 | |
| 1731 | /** |
| 1732 | * request_any_context_irq - allocate an interrupt line |
| 1733 | * @irq: Interrupt line to allocate |
| 1734 | * @handler: Function to be called when the IRQ occurs. |
| 1735 | * Threaded handler for threaded interrupts. |
| 1736 | * @flags: Interrupt type flags |
| 1737 | * @name: An ascii name for the claiming device |
| 1738 | * @dev_id: A cookie passed back to the handler function |
| 1739 | * |
| 1740 | * This call allocates interrupt resources and enables the |
| 1741 | * interrupt line and IRQ handling. It selects either a |
| 1742 | * hardirq or threaded handling method depending on the |
| 1743 | * context. |
| 1744 | * |
| 1745 | * On failure, it returns a negative value. On success, |
| 1746 | * it returns either IRQC_IS_HARDIRQ or IRQC_IS_NESTED. |
| 1747 | */ |
| 1748 | int request_any_context_irq(unsigned int irq, irq_handler_t handler, |
| 1749 | unsigned long flags, const char *name, void *dev_id) |
| 1750 | { |
Chen Fan | e237a55 | 2016-02-15 12:52:01 +0800 | [diff] [blame] | 1751 | struct irq_desc *desc; |
Marc Zyngier | ae731f8 | 2010-03-15 22:56:33 +0000 | [diff] [blame] | 1752 | int ret; |
| 1753 | |
Chen Fan | e237a55 | 2016-02-15 12:52:01 +0800 | [diff] [blame] | 1754 | if (irq == IRQ_NOTCONNECTED) |
| 1755 | return -ENOTCONN; |
| 1756 | |
| 1757 | desc = irq_to_desc(irq); |
Marc Zyngier | ae731f8 | 2010-03-15 22:56:33 +0000 | [diff] [blame] | 1758 | if (!desc) |
| 1759 | return -EINVAL; |
| 1760 | |
Thomas Gleixner | 1ccb4e6 | 2011-02-09 14:44:17 +0100 | [diff] [blame] | 1761 | if (irq_settings_is_nested_thread(desc)) { |
Marc Zyngier | ae731f8 | 2010-03-15 22:56:33 +0000 | [diff] [blame] | 1762 | ret = request_threaded_irq(irq, NULL, handler, |
| 1763 | flags, name, dev_id); |
| 1764 | return !ret ? IRQC_IS_NESTED : ret; |
| 1765 | } |
| 1766 | |
| 1767 | ret = request_irq(irq, handler, flags, name, dev_id); |
| 1768 | return !ret ? IRQC_IS_HARDIRQ : ret; |
| 1769 | } |
| 1770 | EXPORT_SYMBOL_GPL(request_any_context_irq); |
Marc Zyngier | 31d9d9b | 2011-09-23 17:03:06 +0100 | [diff] [blame] | 1771 | |
Marc Zyngier | 1e7c5fd | 2011-09-30 10:48:47 +0100 | [diff] [blame] | 1772 | void enable_percpu_irq(unsigned int irq, unsigned int type) |
Marc Zyngier | 31d9d9b | 2011-09-23 17:03:06 +0100 | [diff] [blame] | 1773 | { |
| 1774 | unsigned int cpu = smp_processor_id(); |
| 1775 | unsigned long flags; |
| 1776 | struct irq_desc *desc = irq_get_desc_lock(irq, &flags, IRQ_GET_DESC_CHECK_PERCPU); |
| 1777 | |
| 1778 | if (!desc) |
| 1779 | return; |
| 1780 | |
Marc Zyngier | f35ad08 | 2016-06-13 10:39:44 +0100 | [diff] [blame] | 1781 | /* |
| 1782 | * If the trigger type is not specified by the caller, then |
| 1783 | * use the default for this interrupt. |
| 1784 | */ |
Marc Zyngier | 1e7c5fd | 2011-09-30 10:48:47 +0100 | [diff] [blame] | 1785 | type &= IRQ_TYPE_SENSE_MASK; |
Marc Zyngier | f35ad08 | 2016-06-13 10:39:44 +0100 | [diff] [blame] | 1786 | if (type == IRQ_TYPE_NONE) |
| 1787 | type = irqd_get_trigger_type(&desc->irq_data); |
| 1788 | |
Marc Zyngier | 1e7c5fd | 2011-09-30 10:48:47 +0100 | [diff] [blame] | 1789 | if (type != IRQ_TYPE_NONE) { |
| 1790 | int ret; |
| 1791 | |
Jiang Liu | a1ff541 | 2015-06-23 19:47:29 +0200 | [diff] [blame] | 1792 | ret = __irq_set_trigger(desc, type); |
Marc Zyngier | 1e7c5fd | 2011-09-30 10:48:47 +0100 | [diff] [blame] | 1793 | |
| 1794 | if (ret) { |
Thomas Gleixner | 32cffdd | 2011-10-04 18:43:57 +0200 | [diff] [blame] | 1795 | WARN(1, "failed to set type for IRQ%d\n", irq); |
Marc Zyngier | 1e7c5fd | 2011-09-30 10:48:47 +0100 | [diff] [blame] | 1796 | goto out; |
| 1797 | } |
| 1798 | } |
| 1799 | |
Marc Zyngier | 31d9d9b | 2011-09-23 17:03:06 +0100 | [diff] [blame] | 1800 | irq_percpu_enable(desc, cpu); |
Marc Zyngier | 1e7c5fd | 2011-09-30 10:48:47 +0100 | [diff] [blame] | 1801 | out: |
Marc Zyngier | 31d9d9b | 2011-09-23 17:03:06 +0100 | [diff] [blame] | 1802 | irq_put_desc_unlock(desc, flags); |
| 1803 | } |
Chris Metcalf | 36a5df8 | 2013-02-01 15:04:26 -0500 | [diff] [blame] | 1804 | EXPORT_SYMBOL_GPL(enable_percpu_irq); |
Marc Zyngier | 31d9d9b | 2011-09-23 17:03:06 +0100 | [diff] [blame] | 1805 | |
Thomas Petazzoni | f0cb322 | 2015-10-20 15:23:51 +0200 | [diff] [blame] | 1806 | /** |
| 1807 | * irq_percpu_is_enabled - Check whether the per cpu irq is enabled |
| 1808 | * @irq: Linux irq number to check for |
| 1809 | * |
| 1810 | * Must be called from a non migratable context. Returns the enable |
| 1811 | * state of a per cpu interrupt on the current cpu. |
| 1812 | */ |
| 1813 | bool irq_percpu_is_enabled(unsigned int irq) |
| 1814 | { |
| 1815 | unsigned int cpu = smp_processor_id(); |
| 1816 | struct irq_desc *desc; |
| 1817 | unsigned long flags; |
| 1818 | bool is_enabled; |
| 1819 | |
| 1820 | desc = irq_get_desc_lock(irq, &flags, IRQ_GET_DESC_CHECK_PERCPU); |
| 1821 | if (!desc) |
| 1822 | return false; |
| 1823 | |
| 1824 | is_enabled = cpumask_test_cpu(cpu, desc->percpu_enabled); |
| 1825 | irq_put_desc_unlock(desc, flags); |
| 1826 | |
| 1827 | return is_enabled; |
| 1828 | } |
| 1829 | EXPORT_SYMBOL_GPL(irq_percpu_is_enabled); |
| 1830 | |
Marc Zyngier | 31d9d9b | 2011-09-23 17:03:06 +0100 | [diff] [blame] | 1831 | void disable_percpu_irq(unsigned int irq) |
| 1832 | { |
| 1833 | unsigned int cpu = smp_processor_id(); |
| 1834 | unsigned long flags; |
| 1835 | struct irq_desc *desc = irq_get_desc_lock(irq, &flags, IRQ_GET_DESC_CHECK_PERCPU); |
| 1836 | |
| 1837 | if (!desc) |
| 1838 | return; |
| 1839 | |
| 1840 | irq_percpu_disable(desc, cpu); |
| 1841 | irq_put_desc_unlock(desc, flags); |
| 1842 | } |
Chris Metcalf | 36a5df8 | 2013-02-01 15:04:26 -0500 | [diff] [blame] | 1843 | EXPORT_SYMBOL_GPL(disable_percpu_irq); |
Marc Zyngier | 31d9d9b | 2011-09-23 17:03:06 +0100 | [diff] [blame] | 1844 | |
| 1845 | /* |
| 1846 | * Internal function to unregister a percpu irqaction. |
| 1847 | */ |
| 1848 | static struct irqaction *__free_percpu_irq(unsigned int irq, void __percpu *dev_id) |
| 1849 | { |
| 1850 | struct irq_desc *desc = irq_to_desc(irq); |
| 1851 | struct irqaction *action; |
| 1852 | unsigned long flags; |
| 1853 | |
| 1854 | WARN(in_interrupt(), "Trying to free IRQ %d from IRQ context!\n", irq); |
| 1855 | |
| 1856 | if (!desc) |
| 1857 | return NULL; |
| 1858 | |
| 1859 | raw_spin_lock_irqsave(&desc->lock, flags); |
| 1860 | |
| 1861 | action = desc->action; |
| 1862 | if (!action || action->percpu_dev_id != dev_id) { |
| 1863 | WARN(1, "Trying to free already-free IRQ %d\n", irq); |
| 1864 | goto bad; |
| 1865 | } |
| 1866 | |
| 1867 | if (!cpumask_empty(desc->percpu_enabled)) { |
| 1868 | WARN(1, "percpu IRQ %d still enabled on CPU%d!\n", |
| 1869 | irq, cpumask_first(desc->percpu_enabled)); |
| 1870 | goto bad; |
| 1871 | } |
| 1872 | |
| 1873 | /* Found it - now remove it from the list of entries: */ |
| 1874 | desc->action = NULL; |
| 1875 | |
| 1876 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
| 1877 | |
| 1878 | unregister_handler_proc(irq, action); |
| 1879 | |
Jon Hunter | be45beb | 2016-06-07 16:12:29 +0100 | [diff] [blame] | 1880 | irq_chip_pm_put(&desc->irq_data); |
Marc Zyngier | 31d9d9b | 2011-09-23 17:03:06 +0100 | [diff] [blame] | 1881 | module_put(desc->owner); |
| 1882 | return action; |
| 1883 | |
| 1884 | bad: |
| 1885 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
| 1886 | return NULL; |
| 1887 | } |
| 1888 | |
| 1889 | /** |
| 1890 | * remove_percpu_irq - free a per-cpu interrupt |
| 1891 | * @irq: Interrupt line to free |
| 1892 | * @act: irqaction for the interrupt |
| 1893 | * |
| 1894 | * Used to remove interrupts statically setup by the early boot process. |
| 1895 | */ |
| 1896 | void remove_percpu_irq(unsigned int irq, struct irqaction *act) |
| 1897 | { |
| 1898 | struct irq_desc *desc = irq_to_desc(irq); |
| 1899 | |
| 1900 | if (desc && irq_settings_is_per_cpu_devid(desc)) |
| 1901 | __free_percpu_irq(irq, act->percpu_dev_id); |
| 1902 | } |
| 1903 | |
| 1904 | /** |
| 1905 | * free_percpu_irq - free an interrupt allocated with request_percpu_irq |
| 1906 | * @irq: Interrupt line to free |
| 1907 | * @dev_id: Device identity to free |
| 1908 | * |
| 1909 | * Remove a percpu interrupt handler. The handler is removed, but |
| 1910 | * the interrupt line is not disabled. This must be done on each |
| 1911 | * CPU before calling this function. The function does not return |
| 1912 | * until any executing interrupts for this IRQ have completed. |
| 1913 | * |
| 1914 | * This function must not be called from interrupt context. |
| 1915 | */ |
| 1916 | void free_percpu_irq(unsigned int irq, void __percpu *dev_id) |
| 1917 | { |
| 1918 | struct irq_desc *desc = irq_to_desc(irq); |
| 1919 | |
| 1920 | if (!desc || !irq_settings_is_per_cpu_devid(desc)) |
| 1921 | return; |
| 1922 | |
| 1923 | chip_bus_lock(desc); |
| 1924 | kfree(__free_percpu_irq(irq, dev_id)); |
| 1925 | chip_bus_sync_unlock(desc); |
| 1926 | } |
Maxime Ripard | aec2e2a | 2015-09-25 18:09:33 +0200 | [diff] [blame] | 1927 | EXPORT_SYMBOL_GPL(free_percpu_irq); |
Marc Zyngier | 31d9d9b | 2011-09-23 17:03:06 +0100 | [diff] [blame] | 1928 | |
| 1929 | /** |
| 1930 | * setup_percpu_irq - setup a per-cpu interrupt |
| 1931 | * @irq: Interrupt line to setup |
| 1932 | * @act: irqaction for the interrupt |
| 1933 | * |
| 1934 | * Used to statically setup per-cpu interrupts in the early boot process. |
| 1935 | */ |
| 1936 | int setup_percpu_irq(unsigned int irq, struct irqaction *act) |
| 1937 | { |
| 1938 | struct irq_desc *desc = irq_to_desc(irq); |
| 1939 | int retval; |
| 1940 | |
| 1941 | if (!desc || !irq_settings_is_per_cpu_devid(desc)) |
| 1942 | return -EINVAL; |
Jon Hunter | be45beb | 2016-06-07 16:12:29 +0100 | [diff] [blame] | 1943 | |
| 1944 | retval = irq_chip_pm_get(&desc->irq_data); |
| 1945 | if (retval < 0) |
| 1946 | return retval; |
| 1947 | |
Marc Zyngier | 31d9d9b | 2011-09-23 17:03:06 +0100 | [diff] [blame] | 1948 | chip_bus_lock(desc); |
| 1949 | retval = __setup_irq(irq, desc, act); |
| 1950 | chip_bus_sync_unlock(desc); |
| 1951 | |
Jon Hunter | be45beb | 2016-06-07 16:12:29 +0100 | [diff] [blame] | 1952 | if (retval) |
| 1953 | irq_chip_pm_put(&desc->irq_data); |
| 1954 | |
Marc Zyngier | 31d9d9b | 2011-09-23 17:03:06 +0100 | [diff] [blame] | 1955 | return retval; |
| 1956 | } |
| 1957 | |
| 1958 | /** |
| 1959 | * request_percpu_irq - allocate a percpu interrupt line |
| 1960 | * @irq: Interrupt line to allocate |
| 1961 | * @handler: Function to be called when the IRQ occurs. |
| 1962 | * @devname: An ascii name for the claiming device |
| 1963 | * @dev_id: A percpu cookie passed back to the handler function |
| 1964 | * |
Maxime Ripard | a1b7feb | 2015-09-25 18:09:32 +0200 | [diff] [blame] | 1965 | * This call allocates interrupt resources and enables the |
| 1966 | * interrupt on the local CPU. If the interrupt is supposed to be |
| 1967 | * enabled on other CPUs, it has to be done on each CPU using |
| 1968 | * enable_percpu_irq(). |
Marc Zyngier | 31d9d9b | 2011-09-23 17:03:06 +0100 | [diff] [blame] | 1969 | * |
| 1970 | * Dev_id must be globally unique. It is a per-cpu variable, and |
| 1971 | * the handler gets called with the interrupted CPU's instance of |
| 1972 | * that variable. |
| 1973 | */ |
| 1974 | int request_percpu_irq(unsigned int irq, irq_handler_t handler, |
| 1975 | const char *devname, void __percpu *dev_id) |
| 1976 | { |
| 1977 | struct irqaction *action; |
| 1978 | struct irq_desc *desc; |
| 1979 | int retval; |
| 1980 | |
| 1981 | if (!dev_id) |
| 1982 | return -EINVAL; |
| 1983 | |
| 1984 | desc = irq_to_desc(irq); |
| 1985 | if (!desc || !irq_settings_can_request(desc) || |
| 1986 | !irq_settings_is_per_cpu_devid(desc)) |
| 1987 | return -EINVAL; |
| 1988 | |
| 1989 | action = kzalloc(sizeof(struct irqaction), GFP_KERNEL); |
| 1990 | if (!action) |
| 1991 | return -ENOMEM; |
| 1992 | |
| 1993 | action->handler = handler; |
Marc Zyngier | 2ed0e64 | 2011-11-16 12:27:39 +0000 | [diff] [blame] | 1994 | action->flags = IRQF_PERCPU | IRQF_NO_SUSPEND; |
Marc Zyngier | 31d9d9b | 2011-09-23 17:03:06 +0100 | [diff] [blame] | 1995 | action->name = devname; |
| 1996 | action->percpu_dev_id = dev_id; |
| 1997 | |
Jon Hunter | be45beb | 2016-06-07 16:12:29 +0100 | [diff] [blame] | 1998 | retval = irq_chip_pm_get(&desc->irq_data); |
Shawn Lin | 4396f46 | 2016-08-22 16:21:52 +0800 | [diff] [blame] | 1999 | if (retval < 0) { |
| 2000 | kfree(action); |
Jon Hunter | be45beb | 2016-06-07 16:12:29 +0100 | [diff] [blame] | 2001 | return retval; |
Shawn Lin | 4396f46 | 2016-08-22 16:21:52 +0800 | [diff] [blame] | 2002 | } |
Jon Hunter | be45beb | 2016-06-07 16:12:29 +0100 | [diff] [blame] | 2003 | |
Marc Zyngier | 31d9d9b | 2011-09-23 17:03:06 +0100 | [diff] [blame] | 2004 | chip_bus_lock(desc); |
| 2005 | retval = __setup_irq(irq, desc, action); |
| 2006 | chip_bus_sync_unlock(desc); |
| 2007 | |
Jon Hunter | be45beb | 2016-06-07 16:12:29 +0100 | [diff] [blame] | 2008 | if (retval) { |
| 2009 | irq_chip_pm_put(&desc->irq_data); |
Marc Zyngier | 31d9d9b | 2011-09-23 17:03:06 +0100 | [diff] [blame] | 2010 | kfree(action); |
Jon Hunter | be45beb | 2016-06-07 16:12:29 +0100 | [diff] [blame] | 2011 | } |
Marc Zyngier | 31d9d9b | 2011-09-23 17:03:06 +0100 | [diff] [blame] | 2012 | |
| 2013 | return retval; |
| 2014 | } |
Maxime Ripard | aec2e2a | 2015-09-25 18:09:33 +0200 | [diff] [blame] | 2015 | EXPORT_SYMBOL_GPL(request_percpu_irq); |
Marc Zyngier | 1b7047e | 2015-03-18 11:01:22 +0000 | [diff] [blame] | 2016 | |
| 2017 | /** |
| 2018 | * irq_get_irqchip_state - returns the irqchip state of a interrupt. |
| 2019 | * @irq: Interrupt line that is forwarded to a VM |
| 2020 | * @which: One of IRQCHIP_STATE_* the caller wants to know about |
| 2021 | * @state: a pointer to a boolean where the state is to be storeed |
| 2022 | * |
| 2023 | * This call snapshots the internal irqchip state of an |
| 2024 | * interrupt, returning into @state the bit corresponding to |
| 2025 | * stage @which |
| 2026 | * |
| 2027 | * This function should be called with preemption disabled if the |
| 2028 | * interrupt controller has per-cpu registers. |
| 2029 | */ |
| 2030 | int irq_get_irqchip_state(unsigned int irq, enum irqchip_irq_state which, |
| 2031 | bool *state) |
| 2032 | { |
| 2033 | struct irq_desc *desc; |
| 2034 | struct irq_data *data; |
| 2035 | struct irq_chip *chip; |
| 2036 | unsigned long flags; |
| 2037 | int err = -EINVAL; |
| 2038 | |
| 2039 | desc = irq_get_desc_buslock(irq, &flags, 0); |
| 2040 | if (!desc) |
| 2041 | return err; |
| 2042 | |
| 2043 | data = irq_desc_get_irq_data(desc); |
| 2044 | |
| 2045 | do { |
| 2046 | chip = irq_data_get_irq_chip(data); |
| 2047 | if (chip->irq_get_irqchip_state) |
| 2048 | break; |
| 2049 | #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY |
| 2050 | data = data->parent_data; |
| 2051 | #else |
| 2052 | data = NULL; |
| 2053 | #endif |
| 2054 | } while (data); |
| 2055 | |
| 2056 | if (data) |
| 2057 | err = chip->irq_get_irqchip_state(data, which, state); |
| 2058 | |
| 2059 | irq_put_desc_busunlock(desc, flags); |
| 2060 | return err; |
| 2061 | } |
Bjorn Andersson | 1ee4fb3 | 2015-07-22 12:43:04 -0700 | [diff] [blame] | 2062 | EXPORT_SYMBOL_GPL(irq_get_irqchip_state); |
Marc Zyngier | 1b7047e | 2015-03-18 11:01:22 +0000 | [diff] [blame] | 2063 | |
| 2064 | /** |
| 2065 | * irq_set_irqchip_state - set the state of a forwarded interrupt. |
| 2066 | * @irq: Interrupt line that is forwarded to a VM |
| 2067 | * @which: State to be restored (one of IRQCHIP_STATE_*) |
| 2068 | * @val: Value corresponding to @which |
| 2069 | * |
| 2070 | * This call sets the internal irqchip state of an interrupt, |
| 2071 | * depending on the value of @which. |
| 2072 | * |
| 2073 | * This function should be called with preemption disabled if the |
| 2074 | * interrupt controller has per-cpu registers. |
| 2075 | */ |
| 2076 | int irq_set_irqchip_state(unsigned int irq, enum irqchip_irq_state which, |
| 2077 | bool val) |
| 2078 | { |
| 2079 | struct irq_desc *desc; |
| 2080 | struct irq_data *data; |
| 2081 | struct irq_chip *chip; |
| 2082 | unsigned long flags; |
| 2083 | int err = -EINVAL; |
| 2084 | |
| 2085 | desc = irq_get_desc_buslock(irq, &flags, 0); |
| 2086 | if (!desc) |
| 2087 | return err; |
| 2088 | |
| 2089 | data = irq_desc_get_irq_data(desc); |
| 2090 | |
| 2091 | do { |
| 2092 | chip = irq_data_get_irq_chip(data); |
| 2093 | if (chip->irq_set_irqchip_state) |
| 2094 | break; |
| 2095 | #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY |
| 2096 | data = data->parent_data; |
| 2097 | #else |
| 2098 | data = NULL; |
| 2099 | #endif |
| 2100 | } while (data); |
| 2101 | |
| 2102 | if (data) |
| 2103 | err = chip->irq_set_irqchip_state(data, which, val); |
| 2104 | |
| 2105 | irq_put_desc_busunlock(desc, flags); |
| 2106 | return err; |
| 2107 | } |
Bjorn Andersson | 1ee4fb3 | 2015-07-22 12:43:04 -0700 | [diff] [blame] | 2108 | EXPORT_SYMBOL_GPL(irq_set_irqchip_state); |