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 | * |
| 71 | * This function may be called - with care - from IRQ context. |
| 72 | */ |
| 73 | void synchronize_hardirq(unsigned int irq) |
| 74 | { |
| 75 | struct irq_desc *desc = irq_to_desc(irq); |
| 76 | |
| 77 | if (desc) |
| 78 | __synchronize_hardirq(desc); |
| 79 | } |
| 80 | EXPORT_SYMBOL(synchronize_hardirq); |
| 81 | |
| 82 | /** |
| 83 | * synchronize_irq - wait for pending IRQ handlers (on other CPUs) |
| 84 | * @irq: interrupt number to wait for |
| 85 | * |
| 86 | * This function waits for any pending IRQ handlers for this interrupt |
| 87 | * to complete before returning. If you use this function while |
| 88 | * holding a resource the IRQ handler may need you will deadlock. |
| 89 | * |
| 90 | * This function may be called - with care - from IRQ context. |
| 91 | */ |
| 92 | void synchronize_irq(unsigned int irq) |
| 93 | { |
| 94 | struct irq_desc *desc = irq_to_desc(irq); |
| 95 | |
| 96 | if (desc) { |
| 97 | __synchronize_hardirq(desc); |
| 98 | /* |
| 99 | * We made sure that no hardirq handler is |
| 100 | * running. Now verify that no threaded handlers are |
| 101 | * active. |
| 102 | */ |
| 103 | wait_event(desc->wait_for_threads, |
| 104 | !atomic_read(&desc->threads_active)); |
| 105 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | EXPORT_SYMBOL(synchronize_irq); |
| 108 | |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 109 | #ifdef CONFIG_SMP |
| 110 | cpumask_var_t irq_default_affinity; |
| 111 | |
Thomas Gleixner | 771ee3b | 2007-02-16 01:27:25 -0800 | [diff] [blame] | 112 | /** |
| 113 | * irq_can_set_affinity - Check if the affinity of a given irq can be set |
| 114 | * @irq: Interrupt to check |
| 115 | * |
| 116 | */ |
| 117 | int irq_can_set_affinity(unsigned int irq) |
| 118 | { |
Yinghai Lu | 08678b0 | 2008-08-19 20:50:05 -0700 | [diff] [blame] | 119 | struct irq_desc *desc = irq_to_desc(irq); |
Thomas Gleixner | 771ee3b | 2007-02-16 01:27:25 -0800 | [diff] [blame] | 120 | |
Thomas Gleixner | bce4303 | 2011-02-10 22:37:41 +0100 | [diff] [blame] | 121 | if (!desc || !irqd_can_balance(&desc->irq_data) || |
| 122 | !desc->irq_data.chip || !desc->irq_data.chip->irq_set_affinity) |
Thomas Gleixner | 771ee3b | 2007-02-16 01:27:25 -0800 | [diff] [blame] | 123 | return 0; |
| 124 | |
| 125 | return 1; |
| 126 | } |
| 127 | |
Thomas Gleixner | 591d2fb | 2009-07-21 11:09:39 +0200 | [diff] [blame] | 128 | /** |
| 129 | * irq_set_thread_affinity - Notify irq threads to adjust affinity |
| 130 | * @desc: irq descriptor which has affitnity changed |
| 131 | * |
| 132 | * We just set IRQTF_AFFINITY and delegate the affinity setting |
| 133 | * to the interrupt thread itself. We can not call |
| 134 | * set_cpus_allowed_ptr() here as we hold desc->lock and this |
| 135 | * code can be called from hard interrupt context. |
| 136 | */ |
| 137 | void irq_set_thread_affinity(struct irq_desc *desc) |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 138 | { |
| 139 | struct irqaction *action = desc->action; |
| 140 | |
| 141 | while (action) { |
| 142 | if (action->thread) |
Thomas Gleixner | 591d2fb | 2009-07-21 11:09:39 +0200 | [diff] [blame] | 143 | set_bit(IRQTF_AFFINITY, &action->thread_flags); |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 144 | action = action->next; |
| 145 | } |
| 146 | } |
| 147 | |
Thomas Gleixner | 1fa46f1 | 2011-02-07 16:46:58 +0100 | [diff] [blame] | 148 | #ifdef CONFIG_GENERIC_PENDING_IRQ |
Thomas Gleixner | 0ef5ca1 | 2011-03-28 21:59:37 +0200 | [diff] [blame] | 149 | static inline bool irq_can_move_pcntxt(struct irq_data *data) |
Thomas Gleixner | 1fa46f1 | 2011-02-07 16:46:58 +0100 | [diff] [blame] | 150 | { |
Thomas Gleixner | 0ef5ca1 | 2011-03-28 21:59:37 +0200 | [diff] [blame] | 151 | return irqd_can_move_in_process_context(data); |
Thomas Gleixner | 1fa46f1 | 2011-02-07 16:46:58 +0100 | [diff] [blame] | 152 | } |
Thomas Gleixner | 0ef5ca1 | 2011-03-28 21:59:37 +0200 | [diff] [blame] | 153 | static inline bool irq_move_pending(struct irq_data *data) |
Thomas Gleixner | 1fa46f1 | 2011-02-07 16:46:58 +0100 | [diff] [blame] | 154 | { |
Thomas Gleixner | 0ef5ca1 | 2011-03-28 21:59:37 +0200 | [diff] [blame] | 155 | return irqd_is_setaffinity_pending(data); |
Thomas Gleixner | 1fa46f1 | 2011-02-07 16:46:58 +0100 | [diff] [blame] | 156 | } |
| 157 | static inline void |
| 158 | irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask) |
| 159 | { |
| 160 | cpumask_copy(desc->pending_mask, mask); |
| 161 | } |
| 162 | static inline void |
| 163 | irq_get_pending(struct cpumask *mask, struct irq_desc *desc) |
| 164 | { |
| 165 | cpumask_copy(mask, desc->pending_mask); |
| 166 | } |
| 167 | #else |
Thomas Gleixner | 0ef5ca1 | 2011-03-28 21:59:37 +0200 | [diff] [blame] | 168 | 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] | 169 | static inline bool irq_move_pending(struct irq_data *data) { return false; } |
Thomas Gleixner | 1fa46f1 | 2011-02-07 16:46:58 +0100 | [diff] [blame] | 170 | static inline void |
| 171 | irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask) { } |
| 172 | static inline void |
| 173 | irq_get_pending(struct cpumask *mask, struct irq_desc *desc) { } |
| 174 | #endif |
| 175 | |
Jiang Liu | 818b0f3 | 2012-03-30 23:11:34 +0800 | [diff] [blame] | 176 | int irq_do_set_affinity(struct irq_data *data, const struct cpumask *mask, |
| 177 | bool force) |
| 178 | { |
| 179 | struct irq_desc *desc = irq_data_to_desc(data); |
| 180 | struct irq_chip *chip = irq_data_get_irq_chip(data); |
| 181 | int ret; |
| 182 | |
Thomas Gleixner | 01f8fa4 | 2014-04-16 14:36:44 +0000 | [diff] [blame] | 183 | ret = chip->irq_set_affinity(data, mask, force); |
Jiang Liu | 818b0f3 | 2012-03-30 23:11:34 +0800 | [diff] [blame] | 184 | switch (ret) { |
| 185 | case IRQ_SET_MASK_OK: |
| 186 | cpumask_copy(data->affinity, mask); |
| 187 | case IRQ_SET_MASK_OK_NOCOPY: |
| 188 | irq_set_thread_affinity(desc); |
| 189 | ret = 0; |
| 190 | } |
| 191 | |
| 192 | return ret; |
| 193 | } |
| 194 | |
Thomas Gleixner | 01f8fa4 | 2014-04-16 14:36:44 +0000 | [diff] [blame] | 195 | int irq_set_affinity_locked(struct irq_data *data, const struct cpumask *mask, |
| 196 | bool force) |
David Daney | c2d0c55 | 2011-03-25 12:38:50 -0700 | [diff] [blame] | 197 | { |
| 198 | struct irq_chip *chip = irq_data_get_irq_chip(data); |
| 199 | struct irq_desc *desc = irq_data_to_desc(data); |
| 200 | int ret = 0; |
| 201 | |
| 202 | if (!chip || !chip->irq_set_affinity) |
| 203 | return -EINVAL; |
| 204 | |
Thomas Gleixner | 0ef5ca1 | 2011-03-28 21:59:37 +0200 | [diff] [blame] | 205 | if (irq_can_move_pcntxt(data)) { |
Thomas Gleixner | 01f8fa4 | 2014-04-16 14:36:44 +0000 | [diff] [blame] | 206 | ret = irq_do_set_affinity(data, mask, force); |
David Daney | c2d0c55 | 2011-03-25 12:38:50 -0700 | [diff] [blame] | 207 | } else { |
| 208 | irqd_set_move_pending(data); |
| 209 | irq_copy_pending(desc, mask); |
| 210 | } |
| 211 | |
| 212 | if (desc->affinity_notify) { |
| 213 | kref_get(&desc->affinity_notify->kref); |
| 214 | schedule_work(&desc->affinity_notify->work); |
| 215 | } |
David Daney | c2d0c55 | 2011-03-25 12:38:50 -0700 | [diff] [blame] | 216 | irqd_set(data, IRQD_AFFINITY_SET); |
| 217 | |
| 218 | return ret; |
| 219 | } |
| 220 | |
Thomas Gleixner | 01f8fa4 | 2014-04-16 14:36:44 +0000 | [diff] [blame] | 221 | 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] | 222 | { |
Yinghai Lu | 08678b0 | 2008-08-19 20:50:05 -0700 | [diff] [blame] | 223 | struct irq_desc *desc = irq_to_desc(irq); |
Thomas Gleixner | f6d87f4 | 2008-11-07 13:18:30 +0100 | [diff] [blame] | 224 | unsigned long flags; |
David Daney | c2d0c55 | 2011-03-25 12:38:50 -0700 | [diff] [blame] | 225 | int ret; |
Thomas Gleixner | 771ee3b | 2007-02-16 01:27:25 -0800 | [diff] [blame] | 226 | |
David Daney | c2d0c55 | 2011-03-25 12:38:50 -0700 | [diff] [blame] | 227 | if (!desc) |
Thomas Gleixner | 771ee3b | 2007-02-16 01:27:25 -0800 | [diff] [blame] | 228 | return -EINVAL; |
| 229 | |
Thomas Gleixner | 239007b | 2009-11-17 16:46:45 +0100 | [diff] [blame] | 230 | raw_spin_lock_irqsave(&desc->lock, flags); |
Thomas Gleixner | 01f8fa4 | 2014-04-16 14:36:44 +0000 | [diff] [blame] | 231 | 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] | 232 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
Thomas Gleixner | 1fa46f1 | 2011-02-07 16:46:58 +0100 | [diff] [blame] | 233 | return ret; |
Thomas Gleixner | 771ee3b | 2007-02-16 01:27:25 -0800 | [diff] [blame] | 234 | } |
| 235 | |
Peter P Waskiewicz Jr | e7a297b | 2010-04-30 14:44:50 -0700 | [diff] [blame] | 236 | int irq_set_affinity_hint(unsigned int irq, const struct cpumask *m) |
| 237 | { |
Peter P Waskiewicz Jr | e7a297b | 2010-04-30 14:44:50 -0700 | [diff] [blame] | 238 | unsigned long flags; |
Marc Zyngier | 31d9d9b | 2011-09-23 17:03:06 +0100 | [diff] [blame] | 239 | 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] | 240 | |
| 241 | if (!desc) |
| 242 | return -EINVAL; |
Peter P Waskiewicz Jr | e7a297b | 2010-04-30 14:44:50 -0700 | [diff] [blame] | 243 | desc->affinity_hint = m; |
Thomas Gleixner | 02725e7 | 2011-02-12 10:37:36 +0100 | [diff] [blame] | 244 | irq_put_desc_unlock(desc, flags); |
Peter P Waskiewicz Jr | e7a297b | 2010-04-30 14:44:50 -0700 | [diff] [blame] | 245 | return 0; |
| 246 | } |
| 247 | EXPORT_SYMBOL_GPL(irq_set_affinity_hint); |
| 248 | |
Ben Hutchings | cd7eab4 | 2011-01-19 21:01:44 +0000 | [diff] [blame] | 249 | static void irq_affinity_notify(struct work_struct *work) |
| 250 | { |
| 251 | struct irq_affinity_notify *notify = |
| 252 | container_of(work, struct irq_affinity_notify, work); |
| 253 | struct irq_desc *desc = irq_to_desc(notify->irq); |
| 254 | cpumask_var_t cpumask; |
| 255 | unsigned long flags; |
| 256 | |
Thomas Gleixner | 1fa46f1 | 2011-02-07 16:46:58 +0100 | [diff] [blame] | 257 | if (!desc || !alloc_cpumask_var(&cpumask, GFP_KERNEL)) |
Ben Hutchings | cd7eab4 | 2011-01-19 21:01:44 +0000 | [diff] [blame] | 258 | goto out; |
| 259 | |
| 260 | raw_spin_lock_irqsave(&desc->lock, flags); |
Thomas Gleixner | 0ef5ca1 | 2011-03-28 21:59:37 +0200 | [diff] [blame] | 261 | if (irq_move_pending(&desc->irq_data)) |
Thomas Gleixner | 1fa46f1 | 2011-02-07 16:46:58 +0100 | [diff] [blame] | 262 | irq_get_pending(cpumask, desc); |
Ben Hutchings | cd7eab4 | 2011-01-19 21:01:44 +0000 | [diff] [blame] | 263 | else |
Thomas Gleixner | 1fb0ef3 | 2011-01-31 08:57:41 +0100 | [diff] [blame] | 264 | cpumask_copy(cpumask, desc->irq_data.affinity); |
Ben Hutchings | cd7eab4 | 2011-01-19 21:01:44 +0000 | [diff] [blame] | 265 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
| 266 | |
| 267 | notify->notify(notify, cpumask); |
| 268 | |
| 269 | free_cpumask_var(cpumask); |
| 270 | out: |
| 271 | kref_put(¬ify->kref, notify->release); |
| 272 | } |
| 273 | |
| 274 | /** |
| 275 | * irq_set_affinity_notifier - control notification of IRQ affinity changes |
| 276 | * @irq: Interrupt for which to enable/disable notification |
| 277 | * @notify: Context for notification, or %NULL to disable |
| 278 | * notification. Function pointers must be initialised; |
| 279 | * the other fields will be initialised by this function. |
| 280 | * |
| 281 | * Must be called in process context. Notification may only be enabled |
| 282 | * after the IRQ is allocated and must be disabled before the IRQ is |
| 283 | * freed using free_irq(). |
| 284 | */ |
| 285 | int |
| 286 | irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify) |
| 287 | { |
| 288 | struct irq_desc *desc = irq_to_desc(irq); |
| 289 | struct irq_affinity_notify *old_notify; |
| 290 | unsigned long flags; |
| 291 | |
| 292 | /* The release function is promised process context */ |
| 293 | might_sleep(); |
| 294 | |
| 295 | if (!desc) |
| 296 | return -EINVAL; |
| 297 | |
| 298 | /* Complete initialisation of *notify */ |
| 299 | if (notify) { |
| 300 | notify->irq = irq; |
| 301 | kref_init(¬ify->kref); |
| 302 | INIT_WORK(¬ify->work, irq_affinity_notify); |
| 303 | } |
| 304 | |
| 305 | raw_spin_lock_irqsave(&desc->lock, flags); |
| 306 | old_notify = desc->affinity_notify; |
| 307 | desc->affinity_notify = notify; |
| 308 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
| 309 | |
| 310 | if (old_notify) |
| 311 | kref_put(&old_notify->kref, old_notify->release); |
| 312 | |
| 313 | return 0; |
| 314 | } |
| 315 | EXPORT_SYMBOL_GPL(irq_set_affinity_notifier); |
| 316 | |
Max Krasnyansky | 1840475 | 2008-05-29 11:02:52 -0700 | [diff] [blame] | 317 | #ifndef CONFIG_AUTO_IRQ_AFFINITY |
| 318 | /* |
| 319 | * Generic version of the affinity autoselector. |
| 320 | */ |
Thomas Gleixner | 3b8249e | 2011-02-07 16:02:20 +0100 | [diff] [blame] | 321 | static int |
| 322 | setup_affinity(unsigned int irq, struct irq_desc *desc, struct cpumask *mask) |
Max Krasnyansky | 1840475 | 2008-05-29 11:02:52 -0700 | [diff] [blame] | 323 | { |
Thomas Gleixner | 569bda8 | 2011-02-07 17:05:08 +0100 | [diff] [blame] | 324 | struct cpumask *set = irq_default_affinity; |
Jiang Liu | 818b0f3 | 2012-03-30 23:11:34 +0800 | [diff] [blame] | 325 | int node = desc->irq_data.node; |
Thomas Gleixner | 569bda8 | 2011-02-07 17:05:08 +0100 | [diff] [blame] | 326 | |
Thomas Gleixner | b008207 | 2011-02-07 17:30:50 +0100 | [diff] [blame] | 327 | /* Excludes PER_CPU and NO_BALANCE interrupts */ |
Max Krasnyansky | 1840475 | 2008-05-29 11:02:52 -0700 | [diff] [blame] | 328 | if (!irq_can_set_affinity(irq)) |
| 329 | return 0; |
| 330 | |
Thomas Gleixner | f6d87f4 | 2008-11-07 13:18:30 +0100 | [diff] [blame] | 331 | /* |
| 332 | * Preserve an userspace affinity setup, but make sure that |
| 333 | * one of the targets is online. |
| 334 | */ |
Thomas Gleixner | 2bdd105 | 2011-02-08 17:22:00 +0100 | [diff] [blame] | 335 | if (irqd_has_set(&desc->irq_data, IRQD_AFFINITY_SET)) { |
Thomas Gleixner | 569bda8 | 2011-02-07 17:05:08 +0100 | [diff] [blame] | 336 | if (cpumask_intersects(desc->irq_data.affinity, |
| 337 | cpu_online_mask)) |
| 338 | set = desc->irq_data.affinity; |
Thomas Gleixner | 0c6f8a8 | 2011-03-28 13:32:20 +0200 | [diff] [blame] | 339 | else |
Thomas Gleixner | 2bdd105 | 2011-02-08 17:22:00 +0100 | [diff] [blame] | 340 | irqd_clear(&desc->irq_data, IRQD_AFFINITY_SET); |
Thomas Gleixner | f6d87f4 | 2008-11-07 13:18:30 +0100 | [diff] [blame] | 341 | } |
Max Krasnyansky | 1840475 | 2008-05-29 11:02:52 -0700 | [diff] [blame] | 342 | |
Thomas Gleixner | 3b8249e | 2011-02-07 16:02:20 +0100 | [diff] [blame] | 343 | cpumask_and(mask, cpu_online_mask, set); |
Prarit Bhargava | 241fc64 | 2012-03-26 15:02:18 -0400 | [diff] [blame] | 344 | if (node != NUMA_NO_NODE) { |
| 345 | const struct cpumask *nodemask = cpumask_of_node(node); |
| 346 | |
| 347 | /* make sure at least one of the cpus in nodemask is online */ |
| 348 | if (cpumask_intersects(mask, nodemask)) |
| 349 | cpumask_and(mask, mask, nodemask); |
| 350 | } |
Jiang Liu | 818b0f3 | 2012-03-30 23:11:34 +0800 | [diff] [blame] | 351 | irq_do_set_affinity(&desc->irq_data, mask, false); |
Max Krasnyansky | 1840475 | 2008-05-29 11:02:52 -0700 | [diff] [blame] | 352 | return 0; |
| 353 | } |
Thomas Gleixner | f6d87f4 | 2008-11-07 13:18:30 +0100 | [diff] [blame] | 354 | #else |
Thomas Gleixner | 3b8249e | 2011-02-07 16:02:20 +0100 | [diff] [blame] | 355 | static inline int |
| 356 | setup_affinity(unsigned int irq, struct irq_desc *d, struct cpumask *mask) |
Thomas Gleixner | f6d87f4 | 2008-11-07 13:18:30 +0100 | [diff] [blame] | 357 | { |
| 358 | return irq_select_affinity(irq); |
| 359 | } |
Max Krasnyansky | 1840475 | 2008-05-29 11:02:52 -0700 | [diff] [blame] | 360 | #endif |
| 361 | |
Thomas Gleixner | f6d87f4 | 2008-11-07 13:18:30 +0100 | [diff] [blame] | 362 | /* |
| 363 | * Called when affinity is set via /proc/irq |
| 364 | */ |
Thomas Gleixner | 3b8249e | 2011-02-07 16:02:20 +0100 | [diff] [blame] | 365 | int irq_select_affinity_usr(unsigned int irq, struct cpumask *mask) |
Thomas Gleixner | f6d87f4 | 2008-11-07 13:18:30 +0100 | [diff] [blame] | 366 | { |
| 367 | struct irq_desc *desc = irq_to_desc(irq); |
| 368 | unsigned long flags; |
| 369 | int ret; |
| 370 | |
Thomas Gleixner | 239007b | 2009-11-17 16:46:45 +0100 | [diff] [blame] | 371 | raw_spin_lock_irqsave(&desc->lock, flags); |
Thomas Gleixner | 3b8249e | 2011-02-07 16:02:20 +0100 | [diff] [blame] | 372 | ret = setup_affinity(irq, desc, mask); |
Thomas Gleixner | 239007b | 2009-11-17 16:46:45 +0100 | [diff] [blame] | 373 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
Thomas Gleixner | f6d87f4 | 2008-11-07 13:18:30 +0100 | [diff] [blame] | 374 | return ret; |
| 375 | } |
| 376 | |
| 377 | #else |
Thomas Gleixner | 3b8249e | 2011-02-07 16:02:20 +0100 | [diff] [blame] | 378 | static inline int |
| 379 | setup_affinity(unsigned int irq, struct irq_desc *desc, struct cpumask *mask) |
Thomas Gleixner | f6d87f4 | 2008-11-07 13:18:30 +0100 | [diff] [blame] | 380 | { |
| 381 | return 0; |
| 382 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | #endif |
| 384 | |
Rafael J. Wysocki | 0a0c516 | 2009-03-16 22:33:49 +0100 | [diff] [blame] | 385 | void __disable_irq(struct irq_desc *desc, unsigned int irq, bool suspend) |
| 386 | { |
| 387 | if (suspend) { |
Ian Campbell | 685fd0b | 2010-07-29 11:16:32 +0100 | [diff] [blame] | 388 | if (!desc->action || (desc->action->flags & IRQF_NO_SUSPEND)) |
Rafael J. Wysocki | 0a0c516 | 2009-03-16 22:33:49 +0100 | [diff] [blame] | 389 | return; |
Thomas Gleixner | c531e83 | 2011-02-08 12:44:58 +0100 | [diff] [blame] | 390 | desc->istate |= IRQS_SUSPENDED; |
Rafael J. Wysocki | 0a0c516 | 2009-03-16 22:33:49 +0100 | [diff] [blame] | 391 | } |
| 392 | |
Thomas Gleixner | 3aae994 | 2011-02-04 10:17:52 +0100 | [diff] [blame] | 393 | if (!desc->depth++) |
Thomas Gleixner | 8792347 | 2011-02-03 12:27:44 +0100 | [diff] [blame] | 394 | irq_disable(desc); |
Rafael J. Wysocki | 0a0c516 | 2009-03-16 22:33:49 +0100 | [diff] [blame] | 395 | } |
| 396 | |
Thomas Gleixner | 02725e7 | 2011-02-12 10:37:36 +0100 | [diff] [blame] | 397 | static int __disable_irq_nosync(unsigned int irq) |
| 398 | { |
| 399 | unsigned long flags; |
Marc Zyngier | 31d9d9b | 2011-09-23 17:03:06 +0100 | [diff] [blame] | 400 | 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] | 401 | |
| 402 | if (!desc) |
| 403 | return -EINVAL; |
| 404 | __disable_irq(desc, irq, false); |
| 405 | irq_put_desc_busunlock(desc, flags); |
| 406 | return 0; |
| 407 | } |
| 408 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | /** |
| 410 | * disable_irq_nosync - disable an irq without waiting |
| 411 | * @irq: Interrupt to disable |
| 412 | * |
| 413 | * Disable the selected interrupt line. Disables and Enables are |
| 414 | * nested. |
| 415 | * Unlike disable_irq(), this function does not ensure existing |
| 416 | * instances of the IRQ handler have completed before returning. |
| 417 | * |
| 418 | * This function may be called from IRQ context. |
| 419 | */ |
| 420 | void disable_irq_nosync(unsigned int irq) |
| 421 | { |
Thomas Gleixner | 02725e7 | 2011-02-12 10:37:36 +0100 | [diff] [blame] | 422 | __disable_irq_nosync(irq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | EXPORT_SYMBOL(disable_irq_nosync); |
| 425 | |
| 426 | /** |
| 427 | * disable_irq - disable an irq and wait for completion |
| 428 | * @irq: Interrupt to disable |
| 429 | * |
| 430 | * Disable the selected interrupt line. Enables and Disables are |
| 431 | * nested. |
| 432 | * This function waits for any pending IRQ handlers for this interrupt |
| 433 | * to complete before returning. If you use this function while |
| 434 | * holding a resource the IRQ handler may need you will deadlock. |
| 435 | * |
| 436 | * This function may be called - with care - from IRQ context. |
| 437 | */ |
| 438 | void disable_irq(unsigned int irq) |
| 439 | { |
Thomas Gleixner | 02725e7 | 2011-02-12 10:37:36 +0100 | [diff] [blame] | 440 | if (!__disable_irq_nosync(irq)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | synchronize_irq(irq); |
| 442 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | EXPORT_SYMBOL(disable_irq); |
| 444 | |
Rafael J. Wysocki | 0a0c516 | 2009-03-16 22:33:49 +0100 | [diff] [blame] | 445 | void __enable_irq(struct irq_desc *desc, unsigned int irq, bool resume) |
Thomas Gleixner | 1adb085 | 2008-04-28 17:01:56 +0200 | [diff] [blame] | 446 | { |
Thomas Gleixner | dc5f219 | 2011-02-04 13:19:20 +0100 | [diff] [blame] | 447 | if (resume) { |
Thomas Gleixner | c531e83 | 2011-02-08 12:44:58 +0100 | [diff] [blame] | 448 | if (!(desc->istate & IRQS_SUSPENDED)) { |
Thomas Gleixner | dc5f219 | 2011-02-04 13:19:20 +0100 | [diff] [blame] | 449 | if (!desc->action) |
| 450 | return; |
| 451 | if (!(desc->action->flags & IRQF_FORCE_RESUME)) |
| 452 | return; |
| 453 | /* Pretend that it got disabled ! */ |
| 454 | desc->depth++; |
| 455 | } |
Thomas Gleixner | c531e83 | 2011-02-08 12:44:58 +0100 | [diff] [blame] | 456 | desc->istate &= ~IRQS_SUSPENDED; |
Thomas Gleixner | dc5f219 | 2011-02-04 13:19:20 +0100 | [diff] [blame] | 457 | } |
Rafael J. Wysocki | 0a0c516 | 2009-03-16 22:33:49 +0100 | [diff] [blame] | 458 | |
Thomas Gleixner | 1adb085 | 2008-04-28 17:01:56 +0200 | [diff] [blame] | 459 | switch (desc->depth) { |
| 460 | case 0: |
Rafael J. Wysocki | 0a0c516 | 2009-03-16 22:33:49 +0100 | [diff] [blame] | 461 | err_out: |
Arjan van de Ven | b8c512f | 2008-07-25 19:45:36 -0700 | [diff] [blame] | 462 | WARN(1, KERN_WARNING "Unbalanced enable for IRQ %d\n", irq); |
Thomas Gleixner | 1adb085 | 2008-04-28 17:01:56 +0200 | [diff] [blame] | 463 | break; |
| 464 | case 1: { |
Thomas Gleixner | c531e83 | 2011-02-08 12:44:58 +0100 | [diff] [blame] | 465 | if (desc->istate & IRQS_SUSPENDED) |
Rafael J. Wysocki | 0a0c516 | 2009-03-16 22:33:49 +0100 | [diff] [blame] | 466 | goto err_out; |
Thomas Gleixner | 1adb085 | 2008-04-28 17:01:56 +0200 | [diff] [blame] | 467 | /* Prevent probing on this irq: */ |
Thomas Gleixner | 1ccb4e6 | 2011-02-09 14:44:17 +0100 | [diff] [blame] | 468 | irq_settings_set_noprobe(desc); |
Thomas Gleixner | 3aae994 | 2011-02-04 10:17:52 +0100 | [diff] [blame] | 469 | irq_enable(desc); |
Thomas Gleixner | 1adb085 | 2008-04-28 17:01:56 +0200 | [diff] [blame] | 470 | check_irq_resend(desc, irq); |
| 471 | /* fall-through */ |
| 472 | } |
| 473 | default: |
| 474 | desc->depth--; |
| 475 | } |
| 476 | } |
| 477 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | /** |
| 479 | * enable_irq - enable handling of an irq |
| 480 | * @irq: Interrupt to enable |
| 481 | * |
| 482 | * Undoes the effect of one call to disable_irq(). If this |
| 483 | * matches the last disable, processing of interrupts on this |
| 484 | * IRQ line is re-enabled. |
| 485 | * |
Thomas Gleixner | 70aedd2 | 2009-08-13 12:17:48 +0200 | [diff] [blame] | 486 | * This function may be called from IRQ context only when |
Thomas Gleixner | 6b8ff31 | 2010-10-01 12:58:38 +0200 | [diff] [blame] | 487 | * 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] | 488 | */ |
| 489 | void enable_irq(unsigned int irq) |
| 490 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | unsigned long flags; |
Marc Zyngier | 31d9d9b | 2011-09-23 17:03:06 +0100 | [diff] [blame] | 492 | 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] | 493 | |
Yinghai Lu | 7d94f7c | 2008-08-19 20:50:14 -0700 | [diff] [blame] | 494 | if (!desc) |
Matthew Wilcox | c2b5a25 | 2005-11-03 07:51:18 -0700 | [diff] [blame] | 495 | return; |
Thomas Gleixner | 50f7c03 | 2011-02-03 13:23:54 +0100 | [diff] [blame] | 496 | if (WARN(!desc->irq_data.chip, |
| 497 | KERN_ERR "enable_irq before setup/request_irq: irq %u\n", irq)) |
Thomas Gleixner | 02725e7 | 2011-02-12 10:37:36 +0100 | [diff] [blame] | 498 | goto out; |
Thomas Gleixner | 2656c36 | 2010-10-22 14:47:57 +0200 | [diff] [blame] | 499 | |
Rafael J. Wysocki | 0a0c516 | 2009-03-16 22:33:49 +0100 | [diff] [blame] | 500 | __enable_irq(desc, irq, false); |
Thomas Gleixner | 02725e7 | 2011-02-12 10:37:36 +0100 | [diff] [blame] | 501 | out: |
| 502 | irq_put_desc_busunlock(desc, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 504 | EXPORT_SYMBOL(enable_irq); |
| 505 | |
David Brownell | 0c5d1eb | 2008-10-01 14:46:18 -0700 | [diff] [blame] | 506 | 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] | 507 | { |
Yinghai Lu | 08678b0 | 2008-08-19 20:50:05 -0700 | [diff] [blame] | 508 | struct irq_desc *desc = irq_to_desc(irq); |
Uwe Kleine-König | 2db8732 | 2008-07-23 14:42:25 +0200 | [diff] [blame] | 509 | int ret = -ENXIO; |
| 510 | |
Santosh Shilimkar | 60f96b4 | 2011-09-09 13:59:35 +0530 | [diff] [blame] | 511 | if (irq_desc_get_chip(desc)->flags & IRQCHIP_SKIP_SET_WAKE) |
| 512 | return 0; |
| 513 | |
Thomas Gleixner | 2f7e99b | 2010-09-27 12:45:50 +0000 | [diff] [blame] | 514 | if (desc->irq_data.chip->irq_set_wake) |
| 515 | 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] | 516 | |
| 517 | return ret; |
| 518 | } |
| 519 | |
Thomas Gleixner | ba9a233 | 2006-06-29 02:24:55 -0700 | [diff] [blame] | 520 | /** |
Thomas Gleixner | a0cd9ca | 2011-02-10 11:36:33 +0100 | [diff] [blame] | 521 | * irq_set_irq_wake - control irq power management wakeup |
Thomas Gleixner | ba9a233 | 2006-06-29 02:24:55 -0700 | [diff] [blame] | 522 | * @irq: interrupt to control |
| 523 | * @on: enable/disable power management wakeup |
| 524 | * |
David Brownell | 15a647e | 2006-07-30 03:03:08 -0700 | [diff] [blame] | 525 | * Enable/disable power management wakeup mode, which is |
| 526 | * disabled by default. Enables and disables must match, |
| 527 | * just as they match for non-wakeup mode support. |
| 528 | * |
| 529 | * Wakeup mode lets this IRQ wake the system from sleep |
| 530 | * states like "suspend to RAM". |
Thomas Gleixner | ba9a233 | 2006-06-29 02:24:55 -0700 | [diff] [blame] | 531 | */ |
Thomas Gleixner | a0cd9ca | 2011-02-10 11:36:33 +0100 | [diff] [blame] | 532 | int irq_set_irq_wake(unsigned int irq, unsigned int on) |
Thomas Gleixner | ba9a233 | 2006-06-29 02:24:55 -0700 | [diff] [blame] | 533 | { |
Thomas Gleixner | ba9a233 | 2006-06-29 02:24:55 -0700 | [diff] [blame] | 534 | unsigned long flags; |
Marc Zyngier | 31d9d9b | 2011-09-23 17:03:06 +0100 | [diff] [blame] | 535 | 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] | 536 | int ret = 0; |
Thomas Gleixner | ba9a233 | 2006-06-29 02:24:55 -0700 | [diff] [blame] | 537 | |
Jesper Juhl | 13863a6 | 2011-06-09 23:14:58 +0200 | [diff] [blame] | 538 | if (!desc) |
| 539 | return -EINVAL; |
| 540 | |
David Brownell | 15a647e | 2006-07-30 03:03:08 -0700 | [diff] [blame] | 541 | /* wakeup-capable irqs can be shared between drivers that |
| 542 | * don't need to have the same sleep mode behaviors. |
| 543 | */ |
David Brownell | 15a647e | 2006-07-30 03:03:08 -0700 | [diff] [blame] | 544 | if (on) { |
Uwe Kleine-König | 2db8732 | 2008-07-23 14:42:25 +0200 | [diff] [blame] | 545 | if (desc->wake_depth++ == 0) { |
| 546 | ret = set_irq_wake_real(irq, on); |
| 547 | if (ret) |
| 548 | desc->wake_depth = 0; |
| 549 | else |
Thomas Gleixner | 7f94226 | 2011-02-10 19:46:26 +0100 | [diff] [blame] | 550 | irqd_set(&desc->irq_data, IRQD_WAKEUP_STATE); |
Uwe Kleine-König | 2db8732 | 2008-07-23 14:42:25 +0200 | [diff] [blame] | 551 | } |
David Brownell | 15a647e | 2006-07-30 03:03:08 -0700 | [diff] [blame] | 552 | } else { |
| 553 | if (desc->wake_depth == 0) { |
Arjan van de Ven | 7a2c477 | 2008-07-25 01:45:54 -0700 | [diff] [blame] | 554 | WARN(1, "Unbalanced IRQ %d wake disable\n", irq); |
Uwe Kleine-König | 2db8732 | 2008-07-23 14:42:25 +0200 | [diff] [blame] | 555 | } else if (--desc->wake_depth == 0) { |
| 556 | ret = set_irq_wake_real(irq, on); |
| 557 | if (ret) |
| 558 | desc->wake_depth = 1; |
| 559 | else |
Thomas Gleixner | 7f94226 | 2011-02-10 19:46:26 +0100 | [diff] [blame] | 560 | irqd_clear(&desc->irq_data, IRQD_WAKEUP_STATE); |
Uwe Kleine-König | 2db8732 | 2008-07-23 14:42:25 +0200 | [diff] [blame] | 561 | } |
David Brownell | 15a647e | 2006-07-30 03:03:08 -0700 | [diff] [blame] | 562 | } |
Thomas Gleixner | 02725e7 | 2011-02-12 10:37:36 +0100 | [diff] [blame] | 563 | irq_put_desc_busunlock(desc, flags); |
Thomas Gleixner | ba9a233 | 2006-06-29 02:24:55 -0700 | [diff] [blame] | 564 | return ret; |
| 565 | } |
Thomas Gleixner | a0cd9ca | 2011-02-10 11:36:33 +0100 | [diff] [blame] | 566 | EXPORT_SYMBOL(irq_set_irq_wake); |
Thomas Gleixner | ba9a233 | 2006-06-29 02:24:55 -0700 | [diff] [blame] | 567 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | /* |
| 569 | * Internal function that tells the architecture code whether a |
| 570 | * particular irq has been exclusively allocated or is available |
| 571 | * for driver use. |
| 572 | */ |
| 573 | int can_request_irq(unsigned int irq, unsigned long irqflags) |
| 574 | { |
Thomas Gleixner | cc8c3b7 | 2010-03-23 22:40:53 +0100 | [diff] [blame] | 575 | unsigned long flags; |
Marc Zyngier | 31d9d9b | 2011-09-23 17:03:06 +0100 | [diff] [blame] | 576 | struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0); |
Thomas Gleixner | 02725e7 | 2011-02-12 10:37:36 +0100 | [diff] [blame] | 577 | int canrequest = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 578 | |
Yinghai Lu | 7d94f7c | 2008-08-19 20:50:14 -0700 | [diff] [blame] | 579 | if (!desc) |
| 580 | return 0; |
| 581 | |
Thomas Gleixner | 02725e7 | 2011-02-12 10:37:36 +0100 | [diff] [blame] | 582 | if (irq_settings_can_request(desc)) { |
Ben Hutchings | 2779db8 | 2013-06-28 02:40:30 +0100 | [diff] [blame] | 583 | if (!desc->action || |
| 584 | irqflags & desc->action->flags & IRQF_SHARED) |
| 585 | canrequest = 1; |
Thomas Gleixner | 02725e7 | 2011-02-12 10:37:36 +0100 | [diff] [blame] | 586 | } |
| 587 | irq_put_desc_unlock(desc, flags); |
| 588 | return canrequest; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | } |
| 590 | |
David Brownell | 0c5d1eb | 2008-10-01 14:46:18 -0700 | [diff] [blame] | 591 | int __irq_set_trigger(struct irq_desc *desc, unsigned int irq, |
Thomas Gleixner | b2ba2c3 | 2010-09-27 12:45:47 +0000 | [diff] [blame] | 592 | unsigned long flags) |
Uwe Kleine-König | 82736f4 | 2008-07-23 21:28:54 -0700 | [diff] [blame] | 593 | { |
Thomas Gleixner | 6b8ff31 | 2010-10-01 12:58:38 +0200 | [diff] [blame] | 594 | struct irq_chip *chip = desc->irq_data.chip; |
Thomas Gleixner | d4d5e08 | 2011-02-10 13:16:14 +0100 | [diff] [blame] | 595 | int ret, unmask = 0; |
Uwe Kleine-König | 82736f4 | 2008-07-23 21:28:54 -0700 | [diff] [blame] | 596 | |
Thomas Gleixner | b2ba2c3 | 2010-09-27 12:45:47 +0000 | [diff] [blame] | 597 | if (!chip || !chip->irq_set_type) { |
Uwe Kleine-König | 82736f4 | 2008-07-23 21:28:54 -0700 | [diff] [blame] | 598 | /* |
| 599 | * IRQF_TRIGGER_* but the PIC does not support multiple |
| 600 | * flow-types? |
| 601 | */ |
Andrew Morton | 97fd75b | 2012-05-31 16:26:07 -0700 | [diff] [blame] | 602 | pr_debug("No set_type function for IRQ %d (%s)\n", irq, |
Thomas Gleixner | f5d8947 | 2012-04-19 12:06:13 +0200 | [diff] [blame] | 603 | chip ? (chip->name ? : "unknown") : "unknown"); |
Uwe Kleine-König | 82736f4 | 2008-07-23 21:28:54 -0700 | [diff] [blame] | 604 | return 0; |
| 605 | } |
| 606 | |
Thomas Gleixner | 876dbd4 | 2011-02-08 17:28:12 +0100 | [diff] [blame] | 607 | flags &= IRQ_TYPE_SENSE_MASK; |
Thomas Gleixner | d4d5e08 | 2011-02-10 13:16:14 +0100 | [diff] [blame] | 608 | |
| 609 | if (chip->flags & IRQCHIP_SET_TYPE_MASKED) { |
Thomas Gleixner | 32f4125 | 2011-03-28 14:10:52 +0200 | [diff] [blame] | 610 | if (!irqd_irq_masked(&desc->irq_data)) |
Thomas Gleixner | d4d5e08 | 2011-02-10 13:16:14 +0100 | [diff] [blame] | 611 | mask_irq(desc); |
Thomas Gleixner | 32f4125 | 2011-03-28 14:10:52 +0200 | [diff] [blame] | 612 | if (!irqd_irq_disabled(&desc->irq_data)) |
Thomas Gleixner | d4d5e08 | 2011-02-10 13:16:14 +0100 | [diff] [blame] | 613 | unmask = 1; |
| 614 | } |
| 615 | |
David Brownell | f2b662d | 2008-12-01 14:31:38 -0800 | [diff] [blame] | 616 | /* caller masked out all except trigger mode flags */ |
Thomas Gleixner | b2ba2c3 | 2010-09-27 12:45:47 +0000 | [diff] [blame] | 617 | ret = chip->irq_set_type(&desc->irq_data, flags); |
Uwe Kleine-König | 82736f4 | 2008-07-23 21:28:54 -0700 | [diff] [blame] | 618 | |
Thomas Gleixner | 876dbd4 | 2011-02-08 17:28:12 +0100 | [diff] [blame] | 619 | switch (ret) { |
| 620 | case IRQ_SET_MASK_OK: |
| 621 | irqd_clear(&desc->irq_data, IRQD_TRIGGER_MASK); |
| 622 | irqd_set(&desc->irq_data, flags); |
| 623 | |
| 624 | case IRQ_SET_MASK_OK_NOCOPY: |
| 625 | flags = irqd_get_trigger_type(&desc->irq_data); |
| 626 | irq_settings_set_trigger_mask(desc, flags); |
| 627 | irqd_clear(&desc->irq_data, IRQD_LEVEL); |
| 628 | irq_settings_clr_level(desc); |
| 629 | if (flags & IRQ_TYPE_LEVEL_MASK) { |
| 630 | irq_settings_set_level(desc); |
| 631 | irqd_set(&desc->irq_data, IRQD_LEVEL); |
| 632 | } |
Thomas Gleixner | 4673247 | 2010-06-07 17:53:51 +0200 | [diff] [blame] | 633 | |
Thomas Gleixner | d4d5e08 | 2011-02-10 13:16:14 +0100 | [diff] [blame] | 634 | ret = 0; |
Thomas Gleixner | 8fff39e | 2011-02-21 14:19:42 +0100 | [diff] [blame] | 635 | break; |
Thomas Gleixner | 876dbd4 | 2011-02-08 17:28:12 +0100 | [diff] [blame] | 636 | default: |
Andrew Morton | 97fd75b | 2012-05-31 16:26:07 -0700 | [diff] [blame] | 637 | pr_err("Setting trigger mode %lu for irq %u failed (%pF)\n", |
Thomas Gleixner | 876dbd4 | 2011-02-08 17:28:12 +0100 | [diff] [blame] | 638 | flags, irq, chip->irq_set_type); |
David Brownell | 0c5d1eb | 2008-10-01 14:46:18 -0700 | [diff] [blame] | 639 | } |
Thomas Gleixner | d4d5e08 | 2011-02-10 13:16:14 +0100 | [diff] [blame] | 640 | if (unmask) |
| 641 | unmask_irq(desc); |
Uwe Kleine-König | 82736f4 | 2008-07-23 21:28:54 -0700 | [diff] [blame] | 642 | return ret; |
| 643 | } |
| 644 | |
Thomas Gleixner | 293a7a0 | 2012-10-16 15:07:49 -0700 | [diff] [blame] | 645 | #ifdef CONFIG_HARDIRQS_SW_RESEND |
| 646 | int irq_set_parent(int irq, int parent_irq) |
| 647 | { |
| 648 | unsigned long flags; |
| 649 | struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0); |
| 650 | |
| 651 | if (!desc) |
| 652 | return -EINVAL; |
| 653 | |
| 654 | desc->parent_irq = parent_irq; |
| 655 | |
| 656 | irq_put_desc_unlock(desc, flags); |
| 657 | return 0; |
| 658 | } |
| 659 | #endif |
| 660 | |
Thomas Gleixner | b25c340 | 2009-08-13 12:17:22 +0200 | [diff] [blame] | 661 | /* |
| 662 | * Default primary interrupt handler for threaded interrupts. Is |
| 663 | * assigned as primary handler when request_threaded_irq is called |
| 664 | * with handler == NULL. Useful for oneshot interrupts. |
| 665 | */ |
| 666 | static irqreturn_t irq_default_primary_handler(int irq, void *dev_id) |
| 667 | { |
| 668 | return IRQ_WAKE_THREAD; |
| 669 | } |
| 670 | |
Thomas Gleixner | 399b5da | 2009-08-13 13:21:38 +0200 | [diff] [blame] | 671 | /* |
| 672 | * Primary handler for nested threaded interrupts. Should never be |
| 673 | * called. |
| 674 | */ |
| 675 | static irqreturn_t irq_nested_primary_handler(int irq, void *dev_id) |
| 676 | { |
| 677 | WARN(1, "Primary handler called for nested irq %d\n", irq); |
| 678 | return IRQ_NONE; |
| 679 | } |
| 680 | |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 681 | static int irq_wait_for_interrupt(struct irqaction *action) |
| 682 | { |
Ido Yariv | 550acb1 | 2011-12-01 13:55:08 +0200 | [diff] [blame] | 683 | set_current_state(TASK_INTERRUPTIBLE); |
| 684 | |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 685 | while (!kthread_should_stop()) { |
Thomas Gleixner | f48fe81 | 2009-03-24 11:46:22 +0100 | [diff] [blame] | 686 | |
| 687 | if (test_and_clear_bit(IRQTF_RUNTHREAD, |
| 688 | &action->thread_flags)) { |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 689 | __set_current_state(TASK_RUNNING); |
| 690 | return 0; |
Thomas Gleixner | f48fe81 | 2009-03-24 11:46:22 +0100 | [diff] [blame] | 691 | } |
| 692 | schedule(); |
Ido Yariv | 550acb1 | 2011-12-01 13:55:08 +0200 | [diff] [blame] | 693 | set_current_state(TASK_INTERRUPTIBLE); |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 694 | } |
Ido Yariv | 550acb1 | 2011-12-01 13:55:08 +0200 | [diff] [blame] | 695 | __set_current_state(TASK_RUNNING); |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 696 | return -1; |
| 697 | } |
| 698 | |
Thomas Gleixner | b25c340 | 2009-08-13 12:17:22 +0200 | [diff] [blame] | 699 | /* |
| 700 | * Oneshot interrupts keep the irq line masked until the threaded |
| 701 | * handler finished. unmask if the interrupt has not been disabled and |
| 702 | * is marked MASKED. |
| 703 | */ |
Thomas Gleixner | b5faba2 | 2011-02-23 23:52:13 +0000 | [diff] [blame] | 704 | static void irq_finalize_oneshot(struct irq_desc *desc, |
Alexander Gordeev | f3f79e3 | 2012-03-21 17:22:35 +0100 | [diff] [blame] | 705 | struct irqaction *action) |
Thomas Gleixner | b25c340 | 2009-08-13 12:17:22 +0200 | [diff] [blame] | 706 | { |
Thomas Gleixner | b5faba2 | 2011-02-23 23:52:13 +0000 | [diff] [blame] | 707 | if (!(desc->istate & IRQS_ONESHOT)) |
| 708 | return; |
Thomas Gleixner | 0b1adaa | 2010-03-09 19:45:54 +0100 | [diff] [blame] | 709 | again: |
Thomas Gleixner | 3876ec9 | 2010-09-27 12:44:35 +0000 | [diff] [blame] | 710 | chip_bus_lock(desc); |
Thomas Gleixner | 239007b | 2009-11-17 16:46:45 +0100 | [diff] [blame] | 711 | raw_spin_lock_irq(&desc->lock); |
Thomas Gleixner | 0b1adaa | 2010-03-09 19:45:54 +0100 | [diff] [blame] | 712 | |
| 713 | /* |
| 714 | * Implausible though it may be we need to protect us against |
| 715 | * the following scenario: |
| 716 | * |
| 717 | * The thread is faster done than the hard interrupt handler |
| 718 | * on the other CPU. If we unmask the irq line then the |
| 719 | * interrupt can come in again and masks the line, leaves due |
Thomas Gleixner | 009b4c3 | 2011-02-07 21:48:49 +0100 | [diff] [blame] | 720 | * to IRQS_INPROGRESS and the irq line is masked forever. |
Thomas Gleixner | b5faba2 | 2011-02-23 23:52:13 +0000 | [diff] [blame] | 721 | * |
| 722 | * This also serializes the state of shared oneshot handlers |
| 723 | * versus "desc->threads_onehsot |= action->thread_mask;" in |
| 724 | * irq_wake_thread(). See the comment there which explains the |
| 725 | * serialization. |
Thomas Gleixner | 0b1adaa | 2010-03-09 19:45:54 +0100 | [diff] [blame] | 726 | */ |
Thomas Gleixner | 32f4125 | 2011-03-28 14:10:52 +0200 | [diff] [blame] | 727 | if (unlikely(irqd_irq_inprogress(&desc->irq_data))) { |
Thomas Gleixner | 0b1adaa | 2010-03-09 19:45:54 +0100 | [diff] [blame] | 728 | raw_spin_unlock_irq(&desc->lock); |
Thomas Gleixner | 3876ec9 | 2010-09-27 12:44:35 +0000 | [diff] [blame] | 729 | chip_bus_sync_unlock(desc); |
Thomas Gleixner | 0b1adaa | 2010-03-09 19:45:54 +0100 | [diff] [blame] | 730 | cpu_relax(); |
| 731 | goto again; |
| 732 | } |
| 733 | |
Thomas Gleixner | b5faba2 | 2011-02-23 23:52:13 +0000 | [diff] [blame] | 734 | /* |
| 735 | * Now check again, whether the thread should run. Otherwise |
| 736 | * we would clear the threads_oneshot bit of this thread which |
| 737 | * was just set. |
| 738 | */ |
Alexander Gordeev | f3f79e3 | 2012-03-21 17:22:35 +0100 | [diff] [blame] | 739 | if (test_bit(IRQTF_RUNTHREAD, &action->thread_flags)) |
Thomas Gleixner | b5faba2 | 2011-02-23 23:52:13 +0000 | [diff] [blame] | 740 | goto out_unlock; |
| 741 | |
| 742 | desc->threads_oneshot &= ~action->thread_mask; |
| 743 | |
Thomas Gleixner | 32f4125 | 2011-03-28 14:10:52 +0200 | [diff] [blame] | 744 | if (!desc->threads_oneshot && !irqd_irq_disabled(&desc->irq_data) && |
| 745 | irqd_irq_masked(&desc->irq_data)) |
Thomas Gleixner | 328a497 | 2014-03-13 19:03:51 +0100 | [diff] [blame] | 746 | unmask_threaded_irq(desc); |
Thomas Gleixner | 32f4125 | 2011-03-28 14:10:52 +0200 | [diff] [blame] | 747 | |
Thomas Gleixner | b5faba2 | 2011-02-23 23:52:13 +0000 | [diff] [blame] | 748 | out_unlock: |
Thomas Gleixner | 239007b | 2009-11-17 16:46:45 +0100 | [diff] [blame] | 749 | raw_spin_unlock_irq(&desc->lock); |
Thomas Gleixner | 3876ec9 | 2010-09-27 12:44:35 +0000 | [diff] [blame] | 750 | chip_bus_sync_unlock(desc); |
Thomas Gleixner | b25c340 | 2009-08-13 12:17:22 +0200 | [diff] [blame] | 751 | } |
| 752 | |
Bruno Premont | 61f3826 | 2009-07-22 22:22:32 +0200 | [diff] [blame] | 753 | #ifdef CONFIG_SMP |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 754 | /* |
Chuansheng Liu | b04c644 | 2014-02-10 16:13:57 +0800 | [diff] [blame] | 755 | * Check whether we need to change the affinity of the interrupt thread. |
Thomas Gleixner | 591d2fb | 2009-07-21 11:09:39 +0200 | [diff] [blame] | 756 | */ |
| 757 | static void |
| 758 | irq_thread_check_affinity(struct irq_desc *desc, struct irqaction *action) |
| 759 | { |
| 760 | cpumask_var_t mask; |
Thomas Gleixner | 04aa530 | 2012-11-03 11:52:09 +0100 | [diff] [blame] | 761 | bool valid = true; |
Thomas Gleixner | 591d2fb | 2009-07-21 11:09:39 +0200 | [diff] [blame] | 762 | |
| 763 | if (!test_and_clear_bit(IRQTF_AFFINITY, &action->thread_flags)) |
| 764 | return; |
| 765 | |
| 766 | /* |
| 767 | * In case we are out of memory we set IRQTF_AFFINITY again and |
| 768 | * try again next time |
| 769 | */ |
| 770 | if (!alloc_cpumask_var(&mask, GFP_KERNEL)) { |
| 771 | set_bit(IRQTF_AFFINITY, &action->thread_flags); |
| 772 | return; |
| 773 | } |
| 774 | |
Thomas Gleixner | 239007b | 2009-11-17 16:46:45 +0100 | [diff] [blame] | 775 | raw_spin_lock_irq(&desc->lock); |
Thomas Gleixner | 04aa530 | 2012-11-03 11:52:09 +0100 | [diff] [blame] | 776 | /* |
| 777 | * This code is triggered unconditionally. Check the affinity |
| 778 | * mask pointer. For CPU_MASK_OFFSTACK=n this is optimized out. |
| 779 | */ |
| 780 | if (desc->irq_data.affinity) |
| 781 | cpumask_copy(mask, desc->irq_data.affinity); |
| 782 | else |
| 783 | valid = false; |
Thomas Gleixner | 239007b | 2009-11-17 16:46:45 +0100 | [diff] [blame] | 784 | raw_spin_unlock_irq(&desc->lock); |
Thomas Gleixner | 591d2fb | 2009-07-21 11:09:39 +0200 | [diff] [blame] | 785 | |
Thomas Gleixner | 04aa530 | 2012-11-03 11:52:09 +0100 | [diff] [blame] | 786 | if (valid) |
| 787 | set_cpus_allowed_ptr(current, mask); |
Thomas Gleixner | 591d2fb | 2009-07-21 11:09:39 +0200 | [diff] [blame] | 788 | free_cpumask_var(mask); |
| 789 | } |
Bruno Premont | 61f3826 | 2009-07-22 22:22:32 +0200 | [diff] [blame] | 790 | #else |
| 791 | static inline void |
| 792 | irq_thread_check_affinity(struct irq_desc *desc, struct irqaction *action) { } |
| 793 | #endif |
Thomas Gleixner | 591d2fb | 2009-07-21 11:09:39 +0200 | [diff] [blame] | 794 | |
| 795 | /* |
Thomas Gleixner | 8d32a30 | 2011-02-23 23:52:23 +0000 | [diff] [blame] | 796 | * Interrupts which are not explicitely requested as threaded |
| 797 | * interrupts rely on the implicit bh/preempt disable of the hard irq |
| 798 | * context. So we need to disable bh here to avoid deadlocks and other |
| 799 | * side effects. |
| 800 | */ |
Sebastian Andrzej Siewior | 3a43e05 | 2011-05-31 08:56:11 +0200 | [diff] [blame] | 801 | static irqreturn_t |
Thomas Gleixner | 8d32a30 | 2011-02-23 23:52:23 +0000 | [diff] [blame] | 802 | irq_forced_thread_fn(struct irq_desc *desc, struct irqaction *action) |
| 803 | { |
Sebastian Andrzej Siewior | 3a43e05 | 2011-05-31 08:56:11 +0200 | [diff] [blame] | 804 | irqreturn_t ret; |
| 805 | |
Thomas Gleixner | 8d32a30 | 2011-02-23 23:52:23 +0000 | [diff] [blame] | 806 | local_bh_disable(); |
Sebastian Andrzej Siewior | 3a43e05 | 2011-05-31 08:56:11 +0200 | [diff] [blame] | 807 | ret = action->thread_fn(action->irq, action->dev_id); |
Alexander Gordeev | f3f79e3 | 2012-03-21 17:22:35 +0100 | [diff] [blame] | 808 | irq_finalize_oneshot(desc, action); |
Thomas Gleixner | 8d32a30 | 2011-02-23 23:52:23 +0000 | [diff] [blame] | 809 | local_bh_enable(); |
Sebastian Andrzej Siewior | 3a43e05 | 2011-05-31 08:56:11 +0200 | [diff] [blame] | 810 | return ret; |
Thomas Gleixner | 8d32a30 | 2011-02-23 23:52:23 +0000 | [diff] [blame] | 811 | } |
| 812 | |
| 813 | /* |
Xie XiuQi | f788e7b | 2013-10-18 09:12:04 +0800 | [diff] [blame] | 814 | * Interrupts explicitly requested as threaded interrupts want to be |
Thomas Gleixner | 8d32a30 | 2011-02-23 23:52:23 +0000 | [diff] [blame] | 815 | * preemtible - many of them need to sleep and wait for slow busses to |
| 816 | * complete. |
| 817 | */ |
Sebastian Andrzej Siewior | 3a43e05 | 2011-05-31 08:56:11 +0200 | [diff] [blame] | 818 | static irqreturn_t irq_thread_fn(struct irq_desc *desc, |
| 819 | struct irqaction *action) |
Thomas Gleixner | 8d32a30 | 2011-02-23 23:52:23 +0000 | [diff] [blame] | 820 | { |
Sebastian Andrzej Siewior | 3a43e05 | 2011-05-31 08:56:11 +0200 | [diff] [blame] | 821 | irqreturn_t ret; |
| 822 | |
| 823 | ret = action->thread_fn(action->irq, action->dev_id); |
Alexander Gordeev | f3f79e3 | 2012-03-21 17:22:35 +0100 | [diff] [blame] | 824 | irq_finalize_oneshot(desc, action); |
Sebastian Andrzej Siewior | 3a43e05 | 2011-05-31 08:56:11 +0200 | [diff] [blame] | 825 | return ret; |
Thomas Gleixner | 8d32a30 | 2011-02-23 23:52:23 +0000 | [diff] [blame] | 826 | } |
| 827 | |
Ido Yariv | 7140ea1 | 2011-12-02 18:24:12 +0200 | [diff] [blame] | 828 | static void wake_threads_waitq(struct irq_desc *desc) |
| 829 | { |
Chuansheng Liu | c685689 | 2014-02-24 11:29:50 +0800 | [diff] [blame] | 830 | if (atomic_dec_and_test(&desc->threads_active)) |
Ido Yariv | 7140ea1 | 2011-12-02 18:24:12 +0200 | [diff] [blame] | 831 | wake_up(&desc->wait_for_threads); |
| 832 | } |
| 833 | |
Al Viro | 67d1214 | 2012-06-27 11:07:19 +0400 | [diff] [blame] | 834 | static void irq_thread_dtor(struct callback_head *unused) |
Oleg Nesterov | 4d1d61a | 2012-05-11 10:59:08 +1000 | [diff] [blame] | 835 | { |
| 836 | struct task_struct *tsk = current; |
| 837 | struct irq_desc *desc; |
| 838 | struct irqaction *action; |
| 839 | |
| 840 | if (WARN_ON_ONCE(!(current->flags & PF_EXITING))) |
| 841 | return; |
| 842 | |
| 843 | action = kthread_data(tsk); |
| 844 | |
Linus Torvalds | fb21aff | 2012-05-31 18:47:30 -0700 | [diff] [blame] | 845 | 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] | 846 | tsk->comm, tsk->pid, action->irq); |
Oleg Nesterov | 4d1d61a | 2012-05-11 10:59:08 +1000 | [diff] [blame] | 847 | |
| 848 | |
| 849 | desc = irq_to_desc(action->irq); |
| 850 | /* |
| 851 | * If IRQTF_RUNTHREAD is set, we need to decrement |
| 852 | * desc->threads_active and wake possible waiters. |
| 853 | */ |
| 854 | if (test_and_clear_bit(IRQTF_RUNTHREAD, &action->thread_flags)) |
| 855 | wake_threads_waitq(desc); |
| 856 | |
| 857 | /* Prevent a stale desc->threads_oneshot */ |
| 858 | irq_finalize_oneshot(desc, action); |
| 859 | } |
| 860 | |
Thomas Gleixner | 8d32a30 | 2011-02-23 23:52:23 +0000 | [diff] [blame] | 861 | /* |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 862 | * Interrupt handler thread |
| 863 | */ |
| 864 | static int irq_thread(void *data) |
| 865 | { |
Al Viro | 67d1214 | 2012-06-27 11:07:19 +0400 | [diff] [blame] | 866 | struct callback_head on_exit_work; |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 867 | struct irqaction *action = data; |
| 868 | struct irq_desc *desc = irq_to_desc(action->irq); |
Sebastian Andrzej Siewior | 3a43e05 | 2011-05-31 08:56:11 +0200 | [diff] [blame] | 869 | irqreturn_t (*handler_fn)(struct irq_desc *desc, |
| 870 | struct irqaction *action); |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 871 | |
Alexander Gordeev | 540b60e | 2012-03-09 14:59:13 +0100 | [diff] [blame] | 872 | if (force_irqthreads && test_bit(IRQTF_FORCED_THREAD, |
Thomas Gleixner | 8d32a30 | 2011-02-23 23:52:23 +0000 | [diff] [blame] | 873 | &action->thread_flags)) |
| 874 | handler_fn = irq_forced_thread_fn; |
| 875 | else |
| 876 | handler_fn = irq_thread_fn; |
| 877 | |
Al Viro | 41f9d29 | 2012-06-26 22:10:04 +0400 | [diff] [blame] | 878 | init_task_work(&on_exit_work, irq_thread_dtor); |
Oleg Nesterov | 4d1d61a | 2012-05-11 10:59:08 +1000 | [diff] [blame] | 879 | task_work_add(current, &on_exit_work, false); |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 880 | |
Sankara Muthukrishnan | f3de44e | 2012-10-31 15:41:23 -0500 | [diff] [blame] | 881 | irq_thread_check_affinity(desc, action); |
| 882 | |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 883 | while (!irq_wait_for_interrupt(action)) { |
Ido Yariv | 7140ea1 | 2011-12-02 18:24:12 +0200 | [diff] [blame] | 884 | irqreturn_t action_ret; |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 885 | |
Thomas Gleixner | 591d2fb | 2009-07-21 11:09:39 +0200 | [diff] [blame] | 886 | irq_thread_check_affinity(desc, action); |
| 887 | |
Ido Yariv | 7140ea1 | 2011-12-02 18:24:12 +0200 | [diff] [blame] | 888 | action_ret = handler_fn(desc, action); |
Thomas Gleixner | 1e77d0a | 2013-03-07 14:53:45 +0100 | [diff] [blame] | 889 | if (action_ret == IRQ_HANDLED) |
| 890 | atomic_inc(&desc->threads_handled); |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 891 | |
Ido Yariv | 7140ea1 | 2011-12-02 18:24:12 +0200 | [diff] [blame] | 892 | wake_threads_waitq(desc); |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 893 | } |
| 894 | |
Ido Yariv | 7140ea1 | 2011-12-02 18:24:12 +0200 | [diff] [blame] | 895 | /* |
| 896 | * This is the regular exit path. __free_irq() is stopping the |
| 897 | * thread via kthread_stop() after calling |
| 898 | * synchronize_irq(). So neither IRQTF_RUNTHREAD nor the |
Thomas Gleixner | e04268b | 2012-03-15 22:55:21 +0100 | [diff] [blame] | 899 | * oneshot mask bit can be set. We cannot verify that as we |
| 900 | * cannot touch the oneshot mask at this point anymore as |
| 901 | * __setup_irq() might have given out currents thread_mask |
| 902 | * again. |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 903 | */ |
Oleg Nesterov | 4d1d61a | 2012-05-11 10:59:08 +1000 | [diff] [blame] | 904 | task_work_cancel(current, irq_thread_dtor); |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 905 | return 0; |
| 906 | } |
| 907 | |
Thomas Gleixner | a92444c | 2014-02-15 00:55:19 +0000 | [diff] [blame] | 908 | /** |
| 909 | * irq_wake_thread - wake the irq thread for the action identified by dev_id |
| 910 | * @irq: Interrupt line |
| 911 | * @dev_id: Device identity for which the thread should be woken |
| 912 | * |
| 913 | */ |
| 914 | void irq_wake_thread(unsigned int irq, void *dev_id) |
| 915 | { |
| 916 | struct irq_desc *desc = irq_to_desc(irq); |
| 917 | struct irqaction *action; |
| 918 | unsigned long flags; |
| 919 | |
| 920 | if (!desc || WARN_ON(irq_settings_is_per_cpu_devid(desc))) |
| 921 | return; |
| 922 | |
| 923 | raw_spin_lock_irqsave(&desc->lock, flags); |
| 924 | for (action = desc->action; action; action = action->next) { |
| 925 | if (action->dev_id == dev_id) { |
| 926 | if (action->thread) |
| 927 | __irq_wake_thread(desc, action); |
| 928 | break; |
| 929 | } |
| 930 | } |
| 931 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
| 932 | } |
| 933 | EXPORT_SYMBOL_GPL(irq_wake_thread); |
| 934 | |
Thomas Gleixner | 8d32a30 | 2011-02-23 23:52:23 +0000 | [diff] [blame] | 935 | static void irq_setup_forced_threading(struct irqaction *new) |
| 936 | { |
| 937 | if (!force_irqthreads) |
| 938 | return; |
| 939 | if (new->flags & (IRQF_NO_THREAD | IRQF_PERCPU | IRQF_ONESHOT)) |
| 940 | return; |
| 941 | |
| 942 | new->flags |= IRQF_ONESHOT; |
| 943 | |
| 944 | if (!new->thread_fn) { |
| 945 | set_bit(IRQTF_FORCED_THREAD, &new->thread_flags); |
| 946 | new->thread_fn = new->handler; |
| 947 | new->handler = irq_default_primary_handler; |
| 948 | } |
| 949 | } |
| 950 | |
Thomas Gleixner | c1bacba | 2014-03-08 08:59:58 +0100 | [diff] [blame] | 951 | static int irq_request_resources(struct irq_desc *desc) |
| 952 | { |
| 953 | struct irq_data *d = &desc->irq_data; |
| 954 | struct irq_chip *c = d->chip; |
| 955 | |
| 956 | return c->irq_request_resources ? c->irq_request_resources(d) : 0; |
| 957 | } |
| 958 | |
| 959 | static void irq_release_resources(struct irq_desc *desc) |
| 960 | { |
| 961 | struct irq_data *d = &desc->irq_data; |
| 962 | struct irq_chip *c = d->chip; |
| 963 | |
| 964 | if (c->irq_release_resources) |
| 965 | c->irq_release_resources(d); |
| 966 | } |
| 967 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 968 | /* |
| 969 | * Internal function to register an irqaction - typically used to |
| 970 | * allocate special interrupts that are part of the architecture. |
| 971 | */ |
Thomas Gleixner | d3c6004 | 2008-10-16 09:55:00 +0200 | [diff] [blame] | 972 | static int |
Ingo Molnar | 327ec56 | 2009-02-15 11:21:37 +0100 | [diff] [blame] | 973 | __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 974 | { |
Ingo Molnar | f17c754 | 2009-02-17 20:43:37 +0100 | [diff] [blame] | 975 | struct irqaction *old, **old_ptr; |
Thomas Gleixner | b5faba2 | 2011-02-23 23:52:13 +0000 | [diff] [blame] | 976 | unsigned long flags, thread_mask = 0; |
Thomas Gleixner | 3b8249e | 2011-02-07 16:02:20 +0100 | [diff] [blame] | 977 | int ret, nested, shared = 0; |
| 978 | cpumask_var_t mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 979 | |
Yinghai Lu | 7d94f7c | 2008-08-19 20:50:14 -0700 | [diff] [blame] | 980 | if (!desc) |
Matthew Wilcox | c2b5a25 | 2005-11-03 07:51:18 -0700 | [diff] [blame] | 981 | return -EINVAL; |
| 982 | |
Thomas Gleixner | 6b8ff31 | 2010-10-01 12:58:38 +0200 | [diff] [blame] | 983 | if (desc->irq_data.chip == &no_irq_chip) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 984 | return -ENOSYS; |
Sebastian Andrzej Siewior | b687380 | 2011-07-11 12:17:31 +0200 | [diff] [blame] | 985 | if (!try_module_get(desc->owner)) |
| 986 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 987 | |
| 988 | /* |
Thomas Gleixner | 399b5da | 2009-08-13 13:21:38 +0200 | [diff] [blame] | 989 | * Check whether the interrupt nests into another interrupt |
| 990 | * thread. |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 991 | */ |
Thomas Gleixner | 1ccb4e6 | 2011-02-09 14:44:17 +0100 | [diff] [blame] | 992 | nested = irq_settings_is_nested_thread(desc); |
Thomas Gleixner | 399b5da | 2009-08-13 13:21:38 +0200 | [diff] [blame] | 993 | if (nested) { |
Sebastian Andrzej Siewior | b687380 | 2011-07-11 12:17:31 +0200 | [diff] [blame] | 994 | if (!new->thread_fn) { |
| 995 | ret = -EINVAL; |
| 996 | goto out_mput; |
| 997 | } |
Thomas Gleixner | 399b5da | 2009-08-13 13:21:38 +0200 | [diff] [blame] | 998 | /* |
| 999 | * Replace the primary handler which was provided from |
| 1000 | * the driver for non nested interrupt handling by the |
| 1001 | * dummy function which warns when called. |
| 1002 | */ |
| 1003 | new->handler = irq_nested_primary_handler; |
Thomas Gleixner | 8d32a30 | 2011-02-23 23:52:23 +0000 | [diff] [blame] | 1004 | } else { |
Paul Mundt | 7f1b124 | 2011-04-07 06:01:44 +0900 | [diff] [blame] | 1005 | if (irq_settings_can_thread(desc)) |
| 1006 | irq_setup_forced_threading(new); |
Thomas Gleixner | 399b5da | 2009-08-13 13:21:38 +0200 | [diff] [blame] | 1007 | } |
| 1008 | |
| 1009 | /* |
| 1010 | * Create a handler thread when a thread function is supplied |
| 1011 | * and the interrupt does not nest into another interrupt |
| 1012 | * thread. |
| 1013 | */ |
| 1014 | if (new->thread_fn && !nested) { |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 1015 | struct task_struct *t; |
Ivo Sieben | ee23871 | 2013-06-03 12:12:02 +0200 | [diff] [blame] | 1016 | static const struct sched_param param = { |
| 1017 | .sched_priority = MAX_USER_RT_PRIO/2, |
| 1018 | }; |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 1019 | |
| 1020 | t = kthread_create(irq_thread, new, "irq/%d-%s", irq, |
| 1021 | new->name); |
Sebastian Andrzej Siewior | b687380 | 2011-07-11 12:17:31 +0200 | [diff] [blame] | 1022 | if (IS_ERR(t)) { |
| 1023 | ret = PTR_ERR(t); |
| 1024 | goto out_mput; |
| 1025 | } |
Ivo Sieben | ee23871 | 2013-06-03 12:12:02 +0200 | [diff] [blame] | 1026 | |
Thomas Pfaff | bbfe65c | 2013-10-11 13:00:40 +0200 | [diff] [blame] | 1027 | sched_setscheduler_nocheck(t, SCHED_FIFO, ¶m); |
Ivo Sieben | ee23871 | 2013-06-03 12:12:02 +0200 | [diff] [blame] | 1028 | |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 1029 | /* |
| 1030 | * We keep the reference to the task struct even if |
| 1031 | * the thread dies to avoid that the interrupt code |
| 1032 | * references an already freed task_struct. |
| 1033 | */ |
| 1034 | get_task_struct(t); |
| 1035 | new->thread = t; |
Thomas Gleixner | 04aa530 | 2012-11-03 11:52:09 +0100 | [diff] [blame] | 1036 | /* |
| 1037 | * Tell the thread to set its affinity. This is |
| 1038 | * important for shared interrupt handlers as we do |
| 1039 | * not invoke setup_affinity() for the secondary |
| 1040 | * handlers as everything is already set up. Even for |
| 1041 | * interrupts marked with IRQF_NO_BALANCE this is |
| 1042 | * correct as we want the thread to move to the cpu(s) |
| 1043 | * on which the requesting code placed the interrupt. |
| 1044 | */ |
| 1045 | set_bit(IRQTF_AFFINITY, &new->thread_flags); |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 1046 | } |
| 1047 | |
Thomas Gleixner | 3b8249e | 2011-02-07 16:02:20 +0100 | [diff] [blame] | 1048 | if (!alloc_cpumask_var(&mask, GFP_KERNEL)) { |
| 1049 | ret = -ENOMEM; |
| 1050 | goto out_thread; |
| 1051 | } |
| 1052 | |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 1053 | /* |
Thomas Gleixner | dc9b229 | 2012-07-13 19:29:45 +0200 | [diff] [blame] | 1054 | * Drivers are often written to work w/o knowledge about the |
| 1055 | * underlying irq chip implementation, so a request for a |
| 1056 | * threaded irq without a primary hard irq context handler |
| 1057 | * requires the ONESHOT flag to be set. Some irq chips like |
| 1058 | * MSI based interrupts are per se one shot safe. Check the |
| 1059 | * chip flags, so we can avoid the unmask dance at the end of |
| 1060 | * the threaded handler for those. |
| 1061 | */ |
| 1062 | if (desc->irq_data.chip->flags & IRQCHIP_ONESHOT_SAFE) |
| 1063 | new->flags &= ~IRQF_ONESHOT; |
| 1064 | |
| 1065 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1066 | * The following block of code has to be executed atomically |
| 1067 | */ |
Thomas Gleixner | 239007b | 2009-11-17 16:46:45 +0100 | [diff] [blame] | 1068 | raw_spin_lock_irqsave(&desc->lock, flags); |
Ingo Molnar | f17c754 | 2009-02-17 20:43:37 +0100 | [diff] [blame] | 1069 | old_ptr = &desc->action; |
| 1070 | old = *old_ptr; |
Ingo Molnar | 06fcb0c | 2006-06-29 02:24:40 -0700 | [diff] [blame] | 1071 | if (old) { |
Thomas Gleixner | e76de9f | 2006-06-29 02:24:56 -0700 | [diff] [blame] | 1072 | /* |
| 1073 | * Can't share interrupts unless both agree to and are |
| 1074 | * the same type (level, edge, polarity). So both flag |
Thomas Gleixner | 3cca53b | 2006-07-01 19:29:31 -0700 | [diff] [blame] | 1075 | * fields must have IRQF_SHARED set and the bits which |
Thomas Gleixner | 9d591ed | 2011-02-23 23:52:16 +0000 | [diff] [blame] | 1076 | * set the trigger type must match. Also all must |
| 1077 | * agree on ONESHOT. |
Thomas Gleixner | e76de9f | 2006-06-29 02:24:56 -0700 | [diff] [blame] | 1078 | */ |
Thomas Gleixner | 3cca53b | 2006-07-01 19:29:31 -0700 | [diff] [blame] | 1079 | if (!((old->flags & new->flags) & IRQF_SHARED) || |
Thomas Gleixner | 9d591ed | 2011-02-23 23:52:16 +0000 | [diff] [blame] | 1080 | ((old->flags ^ new->flags) & IRQF_TRIGGER_MASK) || |
Thomas Gleixner | f5d8947 | 2012-04-19 12:06:13 +0200 | [diff] [blame] | 1081 | ((old->flags ^ new->flags) & IRQF_ONESHOT)) |
Dimitri Sivanich | f516342 | 2006-03-25 03:08:23 -0800 | [diff] [blame] | 1082 | goto mismatch; |
| 1083 | |
Dimitri Sivanich | f516342 | 2006-03-25 03:08:23 -0800 | [diff] [blame] | 1084 | /* All handlers must agree on per-cpuness */ |
Thomas Gleixner | 3cca53b | 2006-07-01 19:29:31 -0700 | [diff] [blame] | 1085 | if ((old->flags & IRQF_PERCPU) != |
| 1086 | (new->flags & IRQF_PERCPU)) |
Dimitri Sivanich | f516342 | 2006-03-25 03:08:23 -0800 | [diff] [blame] | 1087 | goto mismatch; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1088 | |
| 1089 | /* add new interrupt at end of irq queue */ |
| 1090 | do { |
Thomas Gleixner | 52abb70 | 2012-03-06 23:18:54 +0100 | [diff] [blame] | 1091 | /* |
| 1092 | * Or all existing action->thread_mask bits, |
| 1093 | * so we can find the next zero bit for this |
| 1094 | * new action. |
| 1095 | */ |
Thomas Gleixner | b5faba2 | 2011-02-23 23:52:13 +0000 | [diff] [blame] | 1096 | thread_mask |= old->thread_mask; |
Ingo Molnar | f17c754 | 2009-02-17 20:43:37 +0100 | [diff] [blame] | 1097 | old_ptr = &old->next; |
| 1098 | old = *old_ptr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1099 | } while (old); |
| 1100 | shared = 1; |
| 1101 | } |
| 1102 | |
Thomas Gleixner | b5faba2 | 2011-02-23 23:52:13 +0000 | [diff] [blame] | 1103 | /* |
Thomas Gleixner | 52abb70 | 2012-03-06 23:18:54 +0100 | [diff] [blame] | 1104 | * Setup the thread mask for this irqaction for ONESHOT. For |
| 1105 | * !ONESHOT irqs the thread mask is 0 so we can avoid a |
| 1106 | * conditional in irq_wake_thread(). |
Thomas Gleixner | b5faba2 | 2011-02-23 23:52:13 +0000 | [diff] [blame] | 1107 | */ |
Thomas Gleixner | 52abb70 | 2012-03-06 23:18:54 +0100 | [diff] [blame] | 1108 | if (new->flags & IRQF_ONESHOT) { |
| 1109 | /* |
| 1110 | * Unlikely to have 32 resp 64 irqs sharing one line, |
| 1111 | * but who knows. |
| 1112 | */ |
| 1113 | if (thread_mask == ~0UL) { |
| 1114 | ret = -EBUSY; |
| 1115 | goto out_mask; |
| 1116 | } |
| 1117 | /* |
| 1118 | * The thread_mask for the action is or'ed to |
| 1119 | * desc->thread_active to indicate that the |
| 1120 | * IRQF_ONESHOT thread handler has been woken, but not |
| 1121 | * yet finished. The bit is cleared when a thread |
| 1122 | * completes. When all threads of a shared interrupt |
| 1123 | * line have completed desc->threads_active becomes |
| 1124 | * zero and the interrupt line is unmasked. See |
| 1125 | * handle.c:irq_wake_thread() for further information. |
| 1126 | * |
| 1127 | * If no thread is woken by primary (hard irq context) |
| 1128 | * interrupt handlers, then desc->threads_active is |
| 1129 | * also checked for zero to unmask the irq line in the |
| 1130 | * affected hard irq flow handlers |
| 1131 | * (handle_[fasteoi|level]_irq). |
| 1132 | * |
| 1133 | * The new action gets the first zero bit of |
| 1134 | * thread_mask assigned. See the loop above which or's |
| 1135 | * all existing action->thread_mask bits. |
| 1136 | */ |
| 1137 | new->thread_mask = 1 << ffz(thread_mask); |
Thomas Gleixner | 1c6c695 | 2012-04-19 10:35:17 +0200 | [diff] [blame] | 1138 | |
Thomas Gleixner | dc9b229 | 2012-07-13 19:29:45 +0200 | [diff] [blame] | 1139 | } else if (new->handler == irq_default_primary_handler && |
| 1140 | !(desc->irq_data.chip->flags & IRQCHIP_ONESHOT_SAFE)) { |
Thomas Gleixner | 1c6c695 | 2012-04-19 10:35:17 +0200 | [diff] [blame] | 1141 | /* |
| 1142 | * The interrupt was requested with handler = NULL, so |
| 1143 | * we use the default primary handler for it. But it |
| 1144 | * does not have the oneshot flag set. In combination |
| 1145 | * with level interrupts this is deadly, because the |
| 1146 | * default primary handler just wakes the thread, then |
| 1147 | * the irq lines is reenabled, but the device still |
| 1148 | * has the level irq asserted. Rinse and repeat.... |
| 1149 | * |
| 1150 | * While this works for edge type interrupts, we play |
| 1151 | * it safe and reject unconditionally because we can't |
| 1152 | * say for sure which type this interrupt really |
| 1153 | * has. The type flags are unreliable as the |
| 1154 | * underlying chip implementation can override them. |
| 1155 | */ |
Andrew Morton | 97fd75b | 2012-05-31 16:26:07 -0700 | [diff] [blame] | 1156 | 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] | 1157 | irq); |
| 1158 | ret = -EINVAL; |
| 1159 | goto out_mask; |
Thomas Gleixner | b5faba2 | 2011-02-23 23:52:13 +0000 | [diff] [blame] | 1160 | } |
Thomas Gleixner | b5faba2 | 2011-02-23 23:52:13 +0000 | [diff] [blame] | 1161 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1162 | if (!shared) { |
Thomas Gleixner | c1bacba | 2014-03-08 08:59:58 +0100 | [diff] [blame] | 1163 | ret = irq_request_resources(desc); |
| 1164 | if (ret) { |
| 1165 | pr_err("Failed to request resources for %s (irq %d) on irqchip %s\n", |
| 1166 | new->name, irq, desc->irq_data.chip->name); |
| 1167 | goto out_mask; |
| 1168 | } |
| 1169 | |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 1170 | init_waitqueue_head(&desc->wait_for_threads); |
| 1171 | |
Uwe Kleine-König | 82736f4 | 2008-07-23 21:28:54 -0700 | [diff] [blame] | 1172 | /* Setup the type (level, edge polarity) if configured: */ |
| 1173 | if (new->flags & IRQF_TRIGGER_MASK) { |
David Brownell | f2b662d | 2008-12-01 14:31:38 -0800 | [diff] [blame] | 1174 | ret = __irq_set_trigger(desc, irq, |
| 1175 | new->flags & IRQF_TRIGGER_MASK); |
Uwe Kleine-König | 82736f4 | 2008-07-23 21:28:54 -0700 | [diff] [blame] | 1176 | |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 1177 | if (ret) |
Thomas Gleixner | 3b8249e | 2011-02-07 16:02:20 +0100 | [diff] [blame] | 1178 | goto out_mask; |
Thomas Gleixner | 091738a | 2011-02-14 20:16:43 +0100 | [diff] [blame] | 1179 | } |
Ahmed S. Darwish | f75d222 | 2007-05-08 00:27:55 -0700 | [diff] [blame] | 1180 | |
Thomas Gleixner | 009b4c3 | 2011-02-07 21:48:49 +0100 | [diff] [blame] | 1181 | desc->istate &= ~(IRQS_AUTODETECT | IRQS_SPURIOUS_DISABLED | \ |
Thomas Gleixner | 32f4125 | 2011-03-28 14:10:52 +0200 | [diff] [blame] | 1182 | IRQS_ONESHOT | IRQS_WAITING); |
| 1183 | irqd_clear(&desc->irq_data, IRQD_IRQ_INPROGRESS); |
Thomas Gleixner | 94d39e1 | 2006-06-29 02:24:50 -0700 | [diff] [blame] | 1184 | |
Thomas Gleixner | a005677 | 2011-02-08 17:11:03 +0100 | [diff] [blame] | 1185 | if (new->flags & IRQF_PERCPU) { |
| 1186 | irqd_set(&desc->irq_data, IRQD_PER_CPU); |
| 1187 | irq_settings_set_per_cpu(desc); |
| 1188 | } |
Thomas Gleixner | 6a58fb3 | 2011-02-08 15:40:05 +0100 | [diff] [blame] | 1189 | |
Thomas Gleixner | b25c340 | 2009-08-13 12:17:22 +0200 | [diff] [blame] | 1190 | if (new->flags & IRQF_ONESHOT) |
Thomas Gleixner | 3d67bae | 2011-02-07 21:02:10 +0100 | [diff] [blame] | 1191 | desc->istate |= IRQS_ONESHOT; |
Thomas Gleixner | b25c340 | 2009-08-13 12:17:22 +0200 | [diff] [blame] | 1192 | |
Thomas Gleixner | 1ccb4e6 | 2011-02-09 14:44:17 +0100 | [diff] [blame] | 1193 | if (irq_settings_can_autoenable(desc)) |
Thomas Gleixner | b4bc724 | 2012-02-08 11:57:52 +0100 | [diff] [blame] | 1194 | irq_startup(desc, true); |
Thomas Gleixner | 4699923 | 2011-02-02 21:41:14 +0000 | [diff] [blame] | 1195 | else |
Thomas Gleixner | e76de9f | 2006-06-29 02:24:56 -0700 | [diff] [blame] | 1196 | /* Undo nested disables: */ |
| 1197 | desc->depth = 1; |
Max Krasnyansky | 1840475 | 2008-05-29 11:02:52 -0700 | [diff] [blame] | 1198 | |
Thomas Gleixner | 612e368 | 2008-11-07 13:58:46 +0100 | [diff] [blame] | 1199 | /* Exclude IRQ from balancing if requested */ |
Thomas Gleixner | a005677 | 2011-02-08 17:11:03 +0100 | [diff] [blame] | 1200 | if (new->flags & IRQF_NOBALANCING) { |
| 1201 | irq_settings_set_no_balancing(desc); |
| 1202 | irqd_set(&desc->irq_data, IRQD_NO_BALANCING); |
| 1203 | } |
Thomas Gleixner | 612e368 | 2008-11-07 13:58:46 +0100 | [diff] [blame] | 1204 | |
Max Krasnyansky | 1840475 | 2008-05-29 11:02:52 -0700 | [diff] [blame] | 1205 | /* Set default affinity mask once everything is setup */ |
Thomas Gleixner | 3b8249e | 2011-02-07 16:02:20 +0100 | [diff] [blame] | 1206 | setup_affinity(irq, desc, mask); |
David Brownell | 0c5d1eb | 2008-10-01 14:46:18 -0700 | [diff] [blame] | 1207 | |
Thomas Gleixner | 876dbd4 | 2011-02-08 17:28:12 +0100 | [diff] [blame] | 1208 | } else if (new->flags & IRQF_TRIGGER_MASK) { |
| 1209 | unsigned int nmsk = new->flags & IRQF_TRIGGER_MASK; |
| 1210 | unsigned int omsk = irq_settings_get_trigger_mask(desc); |
| 1211 | |
| 1212 | if (nmsk != omsk) |
| 1213 | /* hope the handler works with current trigger mode */ |
Andrew Morton | 97fd75b | 2012-05-31 16:26:07 -0700 | [diff] [blame] | 1214 | pr_warning("irq %d uses trigger mode %u; requested %u\n", |
Thomas Gleixner | 876dbd4 | 2011-02-08 17:28:12 +0100 | [diff] [blame] | 1215 | irq, nmsk, omsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1216 | } |
Uwe Kleine-König | 82736f4 | 2008-07-23 21:28:54 -0700 | [diff] [blame] | 1217 | |
Thomas Gleixner | 69ab849 | 2009-08-17 14:07:16 +0200 | [diff] [blame] | 1218 | new->irq = irq; |
Ingo Molnar | f17c754 | 2009-02-17 20:43:37 +0100 | [diff] [blame] | 1219 | *old_ptr = new; |
Uwe Kleine-König | 82736f4 | 2008-07-23 21:28:54 -0700 | [diff] [blame] | 1220 | |
Linus Torvalds | 8528b0f | 2007-01-23 14:16:31 -0800 | [diff] [blame] | 1221 | /* Reset broken irq detection when installing new handler */ |
| 1222 | desc->irq_count = 0; |
| 1223 | desc->irqs_unhandled = 0; |
Thomas Gleixner | 1adb085 | 2008-04-28 17:01:56 +0200 | [diff] [blame] | 1224 | |
| 1225 | /* |
| 1226 | * Check whether we disabled the irq via the spurious handler |
| 1227 | * before. Reenable it and give it another chance. |
| 1228 | */ |
Thomas Gleixner | 7acdd53 | 2011-02-07 20:40:54 +0100 | [diff] [blame] | 1229 | if (shared && (desc->istate & IRQS_SPURIOUS_DISABLED)) { |
| 1230 | desc->istate &= ~IRQS_SPURIOUS_DISABLED; |
Rafael J. Wysocki | 0a0c516 | 2009-03-16 22:33:49 +0100 | [diff] [blame] | 1231 | __enable_irq(desc, irq, false); |
Thomas Gleixner | 1adb085 | 2008-04-28 17:01:56 +0200 | [diff] [blame] | 1232 | } |
| 1233 | |
Thomas Gleixner | 239007b | 2009-11-17 16:46:45 +0100 | [diff] [blame] | 1234 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1235 | |
Thomas Gleixner | 69ab849 | 2009-08-17 14:07:16 +0200 | [diff] [blame] | 1236 | /* |
| 1237 | * Strictly no need to wake it up, but hung_task complains |
| 1238 | * when no hard interrupt wakes the thread up. |
| 1239 | */ |
| 1240 | if (new->thread) |
| 1241 | wake_up_process(new->thread); |
| 1242 | |
Yinghai Lu | 2c6927a | 2008-08-19 20:50:11 -0700 | [diff] [blame] | 1243 | register_irq_proc(irq, desc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1244 | new->dir = NULL; |
| 1245 | register_handler_proc(irq, new); |
Xiaotian Feng | 4f5058c | 2011-04-02 19:39:35 +0800 | [diff] [blame] | 1246 | free_cpumask_var(mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1247 | |
| 1248 | return 0; |
Dimitri Sivanich | f516342 | 2006-03-25 03:08:23 -0800 | [diff] [blame] | 1249 | |
| 1250 | mismatch: |
Thomas Gleixner | 3cca53b | 2006-07-01 19:29:31 -0700 | [diff] [blame] | 1251 | if (!(new->flags & IRQF_PROBE_SHARED)) { |
Andrew Morton | 97fd75b | 2012-05-31 16:26:07 -0700 | [diff] [blame] | 1252 | pr_err("Flags mismatch irq %d. %08x (%s) vs. %08x (%s)\n", |
Thomas Gleixner | f5d8947 | 2012-04-19 12:06:13 +0200 | [diff] [blame] | 1253 | irq, new->flags, new->name, old->flags, old->name); |
| 1254 | #ifdef CONFIG_DEBUG_SHIRQ |
Andrew Morton | 13e87ec | 2006-04-27 18:39:18 -0700 | [diff] [blame] | 1255 | dump_stack(); |
Alan Cox | 3f05044 | 2007-02-12 00:52:04 -0800 | [diff] [blame] | 1256 | #endif |
Thomas Gleixner | f5d8947 | 2012-04-19 12:06:13 +0200 | [diff] [blame] | 1257 | } |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 1258 | ret = -EBUSY; |
| 1259 | |
Thomas Gleixner | 3b8249e | 2011-02-07 16:02:20 +0100 | [diff] [blame] | 1260 | out_mask: |
Dan Carpenter | 1c38979 | 2011-03-17 14:43:07 +0300 | [diff] [blame] | 1261 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
Thomas Gleixner | 3b8249e | 2011-02-07 16:02:20 +0100 | [diff] [blame] | 1262 | free_cpumask_var(mask); |
| 1263 | |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 1264 | out_thread: |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 1265 | if (new->thread) { |
| 1266 | struct task_struct *t = new->thread; |
| 1267 | |
| 1268 | new->thread = NULL; |
Alexander Gordeev | 05d74ef | 2012-03-09 14:59:40 +0100 | [diff] [blame] | 1269 | kthread_stop(t); |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 1270 | put_task_struct(t); |
| 1271 | } |
Sebastian Andrzej Siewior | b687380 | 2011-07-11 12:17:31 +0200 | [diff] [blame] | 1272 | out_mput: |
| 1273 | module_put(desc->owner); |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 1274 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1275 | } |
| 1276 | |
| 1277 | /** |
Thomas Gleixner | d3c6004 | 2008-10-16 09:55:00 +0200 | [diff] [blame] | 1278 | * setup_irq - setup an interrupt |
| 1279 | * @irq: Interrupt line to setup |
| 1280 | * @act: irqaction for the interrupt |
| 1281 | * |
| 1282 | * Used to statically setup interrupts in the early boot process. |
| 1283 | */ |
| 1284 | int setup_irq(unsigned int irq, struct irqaction *act) |
| 1285 | { |
David Daney | 986c011 | 2011-02-09 16:04:25 -0800 | [diff] [blame] | 1286 | int retval; |
Thomas Gleixner | d3c6004 | 2008-10-16 09:55:00 +0200 | [diff] [blame] | 1287 | struct irq_desc *desc = irq_to_desc(irq); |
| 1288 | |
Marc Zyngier | 31d9d9b | 2011-09-23 17:03:06 +0100 | [diff] [blame] | 1289 | if (WARN_ON(irq_settings_is_per_cpu_devid(desc))) |
| 1290 | return -EINVAL; |
David Daney | 986c011 | 2011-02-09 16:04:25 -0800 | [diff] [blame] | 1291 | chip_bus_lock(desc); |
| 1292 | retval = __setup_irq(irq, desc, act); |
| 1293 | chip_bus_sync_unlock(desc); |
| 1294 | |
| 1295 | return retval; |
Thomas Gleixner | d3c6004 | 2008-10-16 09:55:00 +0200 | [diff] [blame] | 1296 | } |
Magnus Damm | eb53b4e | 2009-03-12 21:05:59 +0900 | [diff] [blame] | 1297 | EXPORT_SYMBOL_GPL(setup_irq); |
Thomas Gleixner | d3c6004 | 2008-10-16 09:55:00 +0200 | [diff] [blame] | 1298 | |
Marc Zyngier | 31d9d9b | 2011-09-23 17:03:06 +0100 | [diff] [blame] | 1299 | /* |
Magnus Damm | cbf94f0 | 2009-03-12 21:05:51 +0900 | [diff] [blame] | 1300 | * Internal function to unregister an irqaction - used to free |
| 1301 | * regular and special interrupts that are part of the architecture. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1302 | */ |
Magnus Damm | cbf94f0 | 2009-03-12 21:05:51 +0900 | [diff] [blame] | 1303 | static struct irqaction *__free_irq(unsigned int irq, void *dev_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1304 | { |
Thomas Gleixner | d3c6004 | 2008-10-16 09:55:00 +0200 | [diff] [blame] | 1305 | struct irq_desc *desc = irq_to_desc(irq); |
Ingo Molnar | f17c754 | 2009-02-17 20:43:37 +0100 | [diff] [blame] | 1306 | struct irqaction *action, **action_ptr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1307 | unsigned long flags; |
| 1308 | |
Ingo Molnar | ae88a23 | 2009-02-15 11:29:50 +0100 | [diff] [blame] | 1309 | 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] | 1310 | |
Yinghai Lu | 7d94f7c | 2008-08-19 20:50:14 -0700 | [diff] [blame] | 1311 | if (!desc) |
Magnus Damm | f21cfb2 | 2009-03-12 21:05:42 +0900 | [diff] [blame] | 1312 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1313 | |
Thomas Gleixner | 239007b | 2009-11-17 16:46:45 +0100 | [diff] [blame] | 1314 | raw_spin_lock_irqsave(&desc->lock, flags); |
Ingo Molnar | ae88a23 | 2009-02-15 11:29:50 +0100 | [diff] [blame] | 1315 | |
| 1316 | /* |
| 1317 | * There can be multiple actions per IRQ descriptor, find the right |
| 1318 | * one based on the dev_id: |
| 1319 | */ |
Ingo Molnar | f17c754 | 2009-02-17 20:43:37 +0100 | [diff] [blame] | 1320 | action_ptr = &desc->action; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1321 | for (;;) { |
Ingo Molnar | f17c754 | 2009-02-17 20:43:37 +0100 | [diff] [blame] | 1322 | action = *action_ptr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1323 | |
Ingo Molnar | ae88a23 | 2009-02-15 11:29:50 +0100 | [diff] [blame] | 1324 | if (!action) { |
| 1325 | WARN(1, "Trying to free already-free IRQ %d\n", irq); |
Thomas Gleixner | 239007b | 2009-11-17 16:46:45 +0100 | [diff] [blame] | 1326 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1327 | |
Magnus Damm | f21cfb2 | 2009-03-12 21:05:42 +0900 | [diff] [blame] | 1328 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1329 | } |
Ingo Molnar | ae88a23 | 2009-02-15 11:29:50 +0100 | [diff] [blame] | 1330 | |
Ingo Molnar | 8316e38 | 2009-02-17 20:28:29 +0100 | [diff] [blame] | 1331 | if (action->dev_id == dev_id) |
| 1332 | break; |
Ingo Molnar | f17c754 | 2009-02-17 20:43:37 +0100 | [diff] [blame] | 1333 | action_ptr = &action->next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1334 | } |
Ingo Molnar | ae88a23 | 2009-02-15 11:29:50 +0100 | [diff] [blame] | 1335 | |
| 1336 | /* Found it - now remove it from the list of entries: */ |
Ingo Molnar | f17c754 | 2009-02-17 20:43:37 +0100 | [diff] [blame] | 1337 | *action_ptr = action->next; |
Ingo Molnar | ae88a23 | 2009-02-15 11:29:50 +0100 | [diff] [blame] | 1338 | |
Ingo Molnar | ae88a23 | 2009-02-15 11:29:50 +0100 | [diff] [blame] | 1339 | /* If this was the last handler, shut down the IRQ line: */ |
Thomas Gleixner | c1bacba | 2014-03-08 08:59:58 +0100 | [diff] [blame] | 1340 | if (!desc->action) { |
Thomas Gleixner | 4699923 | 2011-02-02 21:41:14 +0000 | [diff] [blame] | 1341 | irq_shutdown(desc); |
Thomas Gleixner | c1bacba | 2014-03-08 08:59:58 +0100 | [diff] [blame] | 1342 | irq_release_resources(desc); |
| 1343 | } |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 1344 | |
Peter P Waskiewicz Jr | e7a297b | 2010-04-30 14:44:50 -0700 | [diff] [blame] | 1345 | #ifdef CONFIG_SMP |
| 1346 | /* make sure affinity_hint is cleaned up */ |
| 1347 | if (WARN_ON_ONCE(desc->affinity_hint)) |
| 1348 | desc->affinity_hint = NULL; |
| 1349 | #endif |
| 1350 | |
Thomas Gleixner | 239007b | 2009-11-17 16:46:45 +0100 | [diff] [blame] | 1351 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
Ingo Molnar | ae88a23 | 2009-02-15 11:29:50 +0100 | [diff] [blame] | 1352 | |
| 1353 | unregister_handler_proc(irq, action); |
| 1354 | |
| 1355 | /* Make sure it's not being used on another CPU: */ |
| 1356 | synchronize_irq(irq); |
| 1357 | |
| 1358 | #ifdef CONFIG_DEBUG_SHIRQ |
| 1359 | /* |
| 1360 | * It's a shared IRQ -- the driver ought to be prepared for an IRQ |
| 1361 | * event to happen even now it's being freed, so let's make sure that |
| 1362 | * is so by doing an extra call to the handler .... |
| 1363 | * |
| 1364 | * ( We do this after actually deregistering it, to make sure that a |
| 1365 | * 'real' IRQ doesn't run in * parallel with our fake. ) |
| 1366 | */ |
| 1367 | if (action->flags & IRQF_SHARED) { |
| 1368 | local_irq_save(flags); |
| 1369 | action->handler(irq, dev_id); |
| 1370 | local_irq_restore(flags); |
| 1371 | } |
| 1372 | #endif |
Linus Torvalds | 2d860ad | 2009-08-13 13:05:10 -0700 | [diff] [blame] | 1373 | |
| 1374 | if (action->thread) { |
Alexander Gordeev | 05d74ef | 2012-03-09 14:59:40 +0100 | [diff] [blame] | 1375 | kthread_stop(action->thread); |
Linus Torvalds | 2d860ad | 2009-08-13 13:05:10 -0700 | [diff] [blame] | 1376 | put_task_struct(action->thread); |
| 1377 | } |
| 1378 | |
Sebastian Andrzej Siewior | b687380 | 2011-07-11 12:17:31 +0200 | [diff] [blame] | 1379 | module_put(desc->owner); |
Magnus Damm | f21cfb2 | 2009-03-12 21:05:42 +0900 | [diff] [blame] | 1380 | return action; |
| 1381 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1382 | |
| 1383 | /** |
Magnus Damm | cbf94f0 | 2009-03-12 21:05:51 +0900 | [diff] [blame] | 1384 | * remove_irq - free an interrupt |
| 1385 | * @irq: Interrupt line to free |
| 1386 | * @act: irqaction for the interrupt |
| 1387 | * |
| 1388 | * Used to remove interrupts statically setup by the early boot process. |
| 1389 | */ |
| 1390 | void remove_irq(unsigned int irq, struct irqaction *act) |
| 1391 | { |
Marc Zyngier | 31d9d9b | 2011-09-23 17:03:06 +0100 | [diff] [blame] | 1392 | struct irq_desc *desc = irq_to_desc(irq); |
| 1393 | |
| 1394 | if (desc && !WARN_ON(irq_settings_is_per_cpu_devid(desc))) |
| 1395 | __free_irq(irq, act->dev_id); |
Magnus Damm | cbf94f0 | 2009-03-12 21:05:51 +0900 | [diff] [blame] | 1396 | } |
Magnus Damm | eb53b4e | 2009-03-12 21:05:59 +0900 | [diff] [blame] | 1397 | EXPORT_SYMBOL_GPL(remove_irq); |
Magnus Damm | cbf94f0 | 2009-03-12 21:05:51 +0900 | [diff] [blame] | 1398 | |
| 1399 | /** |
Magnus Damm | f21cfb2 | 2009-03-12 21:05:42 +0900 | [diff] [blame] | 1400 | * free_irq - free an interrupt allocated with request_irq |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1401 | * @irq: Interrupt line to free |
| 1402 | * @dev_id: Device identity to free |
| 1403 | * |
| 1404 | * Remove an interrupt handler. The handler is removed and if the |
| 1405 | * interrupt line is no longer in use by any driver it is disabled. |
| 1406 | * On a shared IRQ the caller must ensure the interrupt is disabled |
| 1407 | * on the card it drives before calling this function. The function |
| 1408 | * does not return until any executing interrupts for this IRQ |
| 1409 | * have completed. |
| 1410 | * |
| 1411 | * This function must not be called from interrupt context. |
| 1412 | */ |
| 1413 | void free_irq(unsigned int irq, void *dev_id) |
| 1414 | { |
Thomas Gleixner | 70aedd2 | 2009-08-13 12:17:48 +0200 | [diff] [blame] | 1415 | struct irq_desc *desc = irq_to_desc(irq); |
| 1416 | |
Marc Zyngier | 31d9d9b | 2011-09-23 17:03:06 +0100 | [diff] [blame] | 1417 | if (!desc || WARN_ON(irq_settings_is_per_cpu_devid(desc))) |
Thomas Gleixner | 70aedd2 | 2009-08-13 12:17:48 +0200 | [diff] [blame] | 1418 | return; |
| 1419 | |
Ben Hutchings | cd7eab4 | 2011-01-19 21:01:44 +0000 | [diff] [blame] | 1420 | #ifdef CONFIG_SMP |
| 1421 | if (WARN_ON(desc->affinity_notify)) |
| 1422 | desc->affinity_notify = NULL; |
| 1423 | #endif |
| 1424 | |
Thomas Gleixner | 3876ec9 | 2010-09-27 12:44:35 +0000 | [diff] [blame] | 1425 | chip_bus_lock(desc); |
Magnus Damm | cbf94f0 | 2009-03-12 21:05:51 +0900 | [diff] [blame] | 1426 | kfree(__free_irq(irq, dev_id)); |
Thomas Gleixner | 3876ec9 | 2010-09-27 12:44:35 +0000 | [diff] [blame] | 1427 | chip_bus_sync_unlock(desc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1428 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1429 | EXPORT_SYMBOL(free_irq); |
| 1430 | |
| 1431 | /** |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 1432 | * request_threaded_irq - allocate an interrupt line |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1433 | * @irq: Interrupt line to allocate |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 1434 | * @handler: Function to be called when the IRQ occurs. |
| 1435 | * Primary handler for threaded interrupts |
Thomas Gleixner | b25c340 | 2009-08-13 12:17:22 +0200 | [diff] [blame] | 1436 | * If NULL and thread_fn != NULL the default |
| 1437 | * primary handler is installed |
Thomas Gleixner | f48fe81 | 2009-03-24 11:46:22 +0100 | [diff] [blame] | 1438 | * @thread_fn: Function called from the irq handler thread |
| 1439 | * If NULL, no irq thread is created |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1440 | * @irqflags: Interrupt type flags |
| 1441 | * @devname: An ascii name for the claiming device |
| 1442 | * @dev_id: A cookie passed back to the handler function |
| 1443 | * |
| 1444 | * This call allocates interrupt resources and enables the |
| 1445 | * interrupt line and IRQ handling. From the point this |
| 1446 | * call is made your handler function may be invoked. Since |
| 1447 | * your handler function must clear any interrupt the board |
| 1448 | * raises, you must take care both to initialise your hardware |
| 1449 | * and to set up the interrupt handler in the right order. |
| 1450 | * |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 1451 | * 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] | 1452 | * then you need to supply @handler and @thread_fn. @handler is |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 1453 | * still called in hard interrupt context and has to check |
| 1454 | * whether the interrupt originates from the device. If yes it |
| 1455 | * needs to disable the interrupt on the device and return |
Steven Rostedt | 39a2edd | 2009-05-12 14:35:54 -0400 | [diff] [blame] | 1456 | * IRQ_WAKE_THREAD which will wake up the handler thread and run |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 1457 | * @thread_fn. This split handler design is necessary to support |
| 1458 | * shared interrupts. |
| 1459 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1460 | * Dev_id must be globally unique. Normally the address of the |
| 1461 | * device data structure is used as the cookie. Since the handler |
| 1462 | * receives this value it makes sense to use it. |
| 1463 | * |
| 1464 | * If your interrupt is shared you must pass a non NULL dev_id |
| 1465 | * as this is required when freeing the interrupt. |
| 1466 | * |
| 1467 | * Flags: |
| 1468 | * |
Thomas Gleixner | 3cca53b | 2006-07-01 19:29:31 -0700 | [diff] [blame] | 1469 | * IRQF_SHARED Interrupt is shared |
David Brownell | 0c5d1eb | 2008-10-01 14:46:18 -0700 | [diff] [blame] | 1470 | * IRQF_TRIGGER_* Specify active edge(s) or level |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1471 | * |
| 1472 | */ |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 1473 | int request_threaded_irq(unsigned int irq, irq_handler_t handler, |
| 1474 | irq_handler_t thread_fn, unsigned long irqflags, |
| 1475 | const char *devname, void *dev_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1476 | { |
Ingo Molnar | 06fcb0c | 2006-06-29 02:24:40 -0700 | [diff] [blame] | 1477 | struct irqaction *action; |
Yinghai Lu | 08678b0 | 2008-08-19 20:50:05 -0700 | [diff] [blame] | 1478 | struct irq_desc *desc; |
Thomas Gleixner | d3c6004 | 2008-10-16 09:55:00 +0200 | [diff] [blame] | 1479 | int retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1480 | |
David Brownell | 470c662 | 2008-12-01 14:31:37 -0800 | [diff] [blame] | 1481 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1482 | * Sanity-check: shared interrupts must pass in a real dev-ID, |
| 1483 | * otherwise we'll have trouble later trying to figure out |
| 1484 | * which interrupt is which (messes up the interrupt freeing |
| 1485 | * logic etc). |
| 1486 | */ |
Thomas Gleixner | 3cca53b | 2006-07-01 19:29:31 -0700 | [diff] [blame] | 1487 | if ((irqflags & IRQF_SHARED) && !dev_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1488 | return -EINVAL; |
Yinghai Lu | 7d94f7c | 2008-08-19 20:50:14 -0700 | [diff] [blame] | 1489 | |
Yinghai Lu | cb5bc83 | 2008-08-19 20:50:17 -0700 | [diff] [blame] | 1490 | desc = irq_to_desc(irq); |
Yinghai Lu | 7d94f7c | 2008-08-19 20:50:14 -0700 | [diff] [blame] | 1491 | if (!desc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1492 | return -EINVAL; |
Yinghai Lu | 7d94f7c | 2008-08-19 20:50:14 -0700 | [diff] [blame] | 1493 | |
Marc Zyngier | 31d9d9b | 2011-09-23 17:03:06 +0100 | [diff] [blame] | 1494 | if (!irq_settings_can_request(desc) || |
| 1495 | WARN_ON(irq_settings_is_per_cpu_devid(desc))) |
Thomas Gleixner | 6550c77 | 2006-06-29 02:24:49 -0700 | [diff] [blame] | 1496 | return -EINVAL; |
Thomas Gleixner | b25c340 | 2009-08-13 12:17:22 +0200 | [diff] [blame] | 1497 | |
| 1498 | if (!handler) { |
| 1499 | if (!thread_fn) |
| 1500 | return -EINVAL; |
| 1501 | handler = irq_default_primary_handler; |
| 1502 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1503 | |
Thomas Gleixner | 4553573 | 2009-02-22 23:00:32 +0100 | [diff] [blame] | 1504 | action = kzalloc(sizeof(struct irqaction), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1505 | if (!action) |
| 1506 | return -ENOMEM; |
| 1507 | |
| 1508 | action->handler = handler; |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 1509 | action->thread_fn = thread_fn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1510 | action->flags = irqflags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1511 | action->name = devname; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1512 | action->dev_id = dev_id; |
| 1513 | |
Thomas Gleixner | 3876ec9 | 2010-09-27 12:44:35 +0000 | [diff] [blame] | 1514 | chip_bus_lock(desc); |
Thomas Gleixner | d3c6004 | 2008-10-16 09:55:00 +0200 | [diff] [blame] | 1515 | retval = __setup_irq(irq, desc, action); |
Thomas Gleixner | 3876ec9 | 2010-09-27 12:44:35 +0000 | [diff] [blame] | 1516 | chip_bus_sync_unlock(desc); |
Thomas Gleixner | 70aedd2 | 2009-08-13 12:17:48 +0200 | [diff] [blame] | 1517 | |
Anton Vorontsov | 377bf1e | 2008-08-21 22:58:28 +0400 | [diff] [blame] | 1518 | if (retval) |
| 1519 | kfree(action); |
| 1520 | |
Thomas Gleixner | 6d83f94 | 2011-02-18 23:27:23 +0100 | [diff] [blame] | 1521 | #ifdef CONFIG_DEBUG_SHIRQ_FIXME |
Luis Henriques | 6ce51c4 | 2009-04-01 18:06:35 +0100 | [diff] [blame] | 1522 | if (!retval && (irqflags & IRQF_SHARED)) { |
David Woodhouse | a304e1b | 2007-02-12 00:52:00 -0800 | [diff] [blame] | 1523 | /* |
| 1524 | * It's a shared IRQ -- the driver ought to be prepared for it |
| 1525 | * to happen immediately, so let's make sure.... |
Anton Vorontsov | 377bf1e | 2008-08-21 22:58:28 +0400 | [diff] [blame] | 1526 | * We disable the irq to make sure that a 'real' IRQ doesn't |
| 1527 | * run in parallel with our fake. |
David Woodhouse | a304e1b | 2007-02-12 00:52:00 -0800 | [diff] [blame] | 1528 | */ |
Jarek Poplawski | 59845b1 | 2007-08-30 23:56:34 -0700 | [diff] [blame] | 1529 | unsigned long flags; |
David Woodhouse | a304e1b | 2007-02-12 00:52:00 -0800 | [diff] [blame] | 1530 | |
Anton Vorontsov | 377bf1e | 2008-08-21 22:58:28 +0400 | [diff] [blame] | 1531 | disable_irq(irq); |
Jarek Poplawski | 59845b1 | 2007-08-30 23:56:34 -0700 | [diff] [blame] | 1532 | local_irq_save(flags); |
Anton Vorontsov | 377bf1e | 2008-08-21 22:58:28 +0400 | [diff] [blame] | 1533 | |
Jarek Poplawski | 59845b1 | 2007-08-30 23:56:34 -0700 | [diff] [blame] | 1534 | handler(irq, dev_id); |
Anton Vorontsov | 377bf1e | 2008-08-21 22:58:28 +0400 | [diff] [blame] | 1535 | |
Jarek Poplawski | 59845b1 | 2007-08-30 23:56:34 -0700 | [diff] [blame] | 1536 | local_irq_restore(flags); |
Anton Vorontsov | 377bf1e | 2008-08-21 22:58:28 +0400 | [diff] [blame] | 1537 | enable_irq(irq); |
David Woodhouse | a304e1b | 2007-02-12 00:52:00 -0800 | [diff] [blame] | 1538 | } |
| 1539 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1540 | return retval; |
| 1541 | } |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 1542 | EXPORT_SYMBOL(request_threaded_irq); |
Marc Zyngier | ae731f8 | 2010-03-15 22:56:33 +0000 | [diff] [blame] | 1543 | |
| 1544 | /** |
| 1545 | * request_any_context_irq - allocate an interrupt line |
| 1546 | * @irq: Interrupt line to allocate |
| 1547 | * @handler: Function to be called when the IRQ occurs. |
| 1548 | * Threaded handler for threaded interrupts. |
| 1549 | * @flags: Interrupt type flags |
| 1550 | * @name: An ascii name for the claiming device |
| 1551 | * @dev_id: A cookie passed back to the handler function |
| 1552 | * |
| 1553 | * This call allocates interrupt resources and enables the |
| 1554 | * interrupt line and IRQ handling. It selects either a |
| 1555 | * hardirq or threaded handling method depending on the |
| 1556 | * context. |
| 1557 | * |
| 1558 | * On failure, it returns a negative value. On success, |
| 1559 | * it returns either IRQC_IS_HARDIRQ or IRQC_IS_NESTED. |
| 1560 | */ |
| 1561 | int request_any_context_irq(unsigned int irq, irq_handler_t handler, |
| 1562 | unsigned long flags, const char *name, void *dev_id) |
| 1563 | { |
| 1564 | struct irq_desc *desc = irq_to_desc(irq); |
| 1565 | int ret; |
| 1566 | |
| 1567 | if (!desc) |
| 1568 | return -EINVAL; |
| 1569 | |
Thomas Gleixner | 1ccb4e6 | 2011-02-09 14:44:17 +0100 | [diff] [blame] | 1570 | if (irq_settings_is_nested_thread(desc)) { |
Marc Zyngier | ae731f8 | 2010-03-15 22:56:33 +0000 | [diff] [blame] | 1571 | ret = request_threaded_irq(irq, NULL, handler, |
| 1572 | flags, name, dev_id); |
| 1573 | return !ret ? IRQC_IS_NESTED : ret; |
| 1574 | } |
| 1575 | |
| 1576 | ret = request_irq(irq, handler, flags, name, dev_id); |
| 1577 | return !ret ? IRQC_IS_HARDIRQ : ret; |
| 1578 | } |
| 1579 | EXPORT_SYMBOL_GPL(request_any_context_irq); |
Marc Zyngier | 31d9d9b | 2011-09-23 17:03:06 +0100 | [diff] [blame] | 1580 | |
Marc Zyngier | 1e7c5fd | 2011-09-30 10:48:47 +0100 | [diff] [blame] | 1581 | void enable_percpu_irq(unsigned int irq, unsigned int type) |
Marc Zyngier | 31d9d9b | 2011-09-23 17:03:06 +0100 | [diff] [blame] | 1582 | { |
| 1583 | unsigned int cpu = smp_processor_id(); |
| 1584 | unsigned long flags; |
| 1585 | struct irq_desc *desc = irq_get_desc_lock(irq, &flags, IRQ_GET_DESC_CHECK_PERCPU); |
| 1586 | |
| 1587 | if (!desc) |
| 1588 | return; |
| 1589 | |
Marc Zyngier | 1e7c5fd | 2011-09-30 10:48:47 +0100 | [diff] [blame] | 1590 | type &= IRQ_TYPE_SENSE_MASK; |
| 1591 | if (type != IRQ_TYPE_NONE) { |
| 1592 | int ret; |
| 1593 | |
| 1594 | ret = __irq_set_trigger(desc, irq, type); |
| 1595 | |
| 1596 | if (ret) { |
Thomas Gleixner | 32cffdd | 2011-10-04 18:43:57 +0200 | [diff] [blame] | 1597 | WARN(1, "failed to set type for IRQ%d\n", irq); |
Marc Zyngier | 1e7c5fd | 2011-09-30 10:48:47 +0100 | [diff] [blame] | 1598 | goto out; |
| 1599 | } |
| 1600 | } |
| 1601 | |
Marc Zyngier | 31d9d9b | 2011-09-23 17:03:06 +0100 | [diff] [blame] | 1602 | irq_percpu_enable(desc, cpu); |
Marc Zyngier | 1e7c5fd | 2011-09-30 10:48:47 +0100 | [diff] [blame] | 1603 | out: |
Marc Zyngier | 31d9d9b | 2011-09-23 17:03:06 +0100 | [diff] [blame] | 1604 | irq_put_desc_unlock(desc, flags); |
| 1605 | } |
Chris Metcalf | 36a5df8 | 2013-02-01 15:04:26 -0500 | [diff] [blame] | 1606 | EXPORT_SYMBOL_GPL(enable_percpu_irq); |
Marc Zyngier | 31d9d9b | 2011-09-23 17:03:06 +0100 | [diff] [blame] | 1607 | |
| 1608 | void disable_percpu_irq(unsigned int irq) |
| 1609 | { |
| 1610 | unsigned int cpu = smp_processor_id(); |
| 1611 | unsigned long flags; |
| 1612 | struct irq_desc *desc = irq_get_desc_lock(irq, &flags, IRQ_GET_DESC_CHECK_PERCPU); |
| 1613 | |
| 1614 | if (!desc) |
| 1615 | return; |
| 1616 | |
| 1617 | irq_percpu_disable(desc, cpu); |
| 1618 | irq_put_desc_unlock(desc, flags); |
| 1619 | } |
Chris Metcalf | 36a5df8 | 2013-02-01 15:04:26 -0500 | [diff] [blame] | 1620 | EXPORT_SYMBOL_GPL(disable_percpu_irq); |
Marc Zyngier | 31d9d9b | 2011-09-23 17:03:06 +0100 | [diff] [blame] | 1621 | |
| 1622 | /* |
| 1623 | * Internal function to unregister a percpu irqaction. |
| 1624 | */ |
| 1625 | static struct irqaction *__free_percpu_irq(unsigned int irq, void __percpu *dev_id) |
| 1626 | { |
| 1627 | struct irq_desc *desc = irq_to_desc(irq); |
| 1628 | struct irqaction *action; |
| 1629 | unsigned long flags; |
| 1630 | |
| 1631 | WARN(in_interrupt(), "Trying to free IRQ %d from IRQ context!\n", irq); |
| 1632 | |
| 1633 | if (!desc) |
| 1634 | return NULL; |
| 1635 | |
| 1636 | raw_spin_lock_irqsave(&desc->lock, flags); |
| 1637 | |
| 1638 | action = desc->action; |
| 1639 | if (!action || action->percpu_dev_id != dev_id) { |
| 1640 | WARN(1, "Trying to free already-free IRQ %d\n", irq); |
| 1641 | goto bad; |
| 1642 | } |
| 1643 | |
| 1644 | if (!cpumask_empty(desc->percpu_enabled)) { |
| 1645 | WARN(1, "percpu IRQ %d still enabled on CPU%d!\n", |
| 1646 | irq, cpumask_first(desc->percpu_enabled)); |
| 1647 | goto bad; |
| 1648 | } |
| 1649 | |
| 1650 | /* Found it - now remove it from the list of entries: */ |
| 1651 | desc->action = NULL; |
| 1652 | |
| 1653 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
| 1654 | |
| 1655 | unregister_handler_proc(irq, action); |
| 1656 | |
| 1657 | module_put(desc->owner); |
| 1658 | return action; |
| 1659 | |
| 1660 | bad: |
| 1661 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
| 1662 | return NULL; |
| 1663 | } |
| 1664 | |
| 1665 | /** |
| 1666 | * remove_percpu_irq - free a per-cpu interrupt |
| 1667 | * @irq: Interrupt line to free |
| 1668 | * @act: irqaction for the interrupt |
| 1669 | * |
| 1670 | * Used to remove interrupts statically setup by the early boot process. |
| 1671 | */ |
| 1672 | void remove_percpu_irq(unsigned int irq, struct irqaction *act) |
| 1673 | { |
| 1674 | struct irq_desc *desc = irq_to_desc(irq); |
| 1675 | |
| 1676 | if (desc && irq_settings_is_per_cpu_devid(desc)) |
| 1677 | __free_percpu_irq(irq, act->percpu_dev_id); |
| 1678 | } |
| 1679 | |
| 1680 | /** |
| 1681 | * free_percpu_irq - free an interrupt allocated with request_percpu_irq |
| 1682 | * @irq: Interrupt line to free |
| 1683 | * @dev_id: Device identity to free |
| 1684 | * |
| 1685 | * Remove a percpu interrupt handler. The handler is removed, but |
| 1686 | * the interrupt line is not disabled. This must be done on each |
| 1687 | * CPU before calling this function. The function does not return |
| 1688 | * until any executing interrupts for this IRQ have completed. |
| 1689 | * |
| 1690 | * This function must not be called from interrupt context. |
| 1691 | */ |
| 1692 | void free_percpu_irq(unsigned int irq, void __percpu *dev_id) |
| 1693 | { |
| 1694 | struct irq_desc *desc = irq_to_desc(irq); |
| 1695 | |
| 1696 | if (!desc || !irq_settings_is_per_cpu_devid(desc)) |
| 1697 | return; |
| 1698 | |
| 1699 | chip_bus_lock(desc); |
| 1700 | kfree(__free_percpu_irq(irq, dev_id)); |
| 1701 | chip_bus_sync_unlock(desc); |
| 1702 | } |
| 1703 | |
| 1704 | /** |
| 1705 | * setup_percpu_irq - setup a per-cpu interrupt |
| 1706 | * @irq: Interrupt line to setup |
| 1707 | * @act: irqaction for the interrupt |
| 1708 | * |
| 1709 | * Used to statically setup per-cpu interrupts in the early boot process. |
| 1710 | */ |
| 1711 | int setup_percpu_irq(unsigned int irq, struct irqaction *act) |
| 1712 | { |
| 1713 | struct irq_desc *desc = irq_to_desc(irq); |
| 1714 | int retval; |
| 1715 | |
| 1716 | if (!desc || !irq_settings_is_per_cpu_devid(desc)) |
| 1717 | return -EINVAL; |
| 1718 | chip_bus_lock(desc); |
| 1719 | retval = __setup_irq(irq, desc, act); |
| 1720 | chip_bus_sync_unlock(desc); |
| 1721 | |
| 1722 | return retval; |
| 1723 | } |
| 1724 | |
| 1725 | /** |
| 1726 | * request_percpu_irq - allocate a percpu interrupt line |
| 1727 | * @irq: Interrupt line to allocate |
| 1728 | * @handler: Function to be called when the IRQ occurs. |
| 1729 | * @devname: An ascii name for the claiming device |
| 1730 | * @dev_id: A percpu cookie passed back to the handler function |
| 1731 | * |
| 1732 | * This call allocates interrupt resources, but doesn't |
| 1733 | * automatically enable the interrupt. It has to be done on each |
| 1734 | * CPU using enable_percpu_irq(). |
| 1735 | * |
| 1736 | * Dev_id must be globally unique. It is a per-cpu variable, and |
| 1737 | * the handler gets called with the interrupted CPU's instance of |
| 1738 | * that variable. |
| 1739 | */ |
| 1740 | int request_percpu_irq(unsigned int irq, irq_handler_t handler, |
| 1741 | const char *devname, void __percpu *dev_id) |
| 1742 | { |
| 1743 | struct irqaction *action; |
| 1744 | struct irq_desc *desc; |
| 1745 | int retval; |
| 1746 | |
| 1747 | if (!dev_id) |
| 1748 | return -EINVAL; |
| 1749 | |
| 1750 | desc = irq_to_desc(irq); |
| 1751 | if (!desc || !irq_settings_can_request(desc) || |
| 1752 | !irq_settings_is_per_cpu_devid(desc)) |
| 1753 | return -EINVAL; |
| 1754 | |
| 1755 | action = kzalloc(sizeof(struct irqaction), GFP_KERNEL); |
| 1756 | if (!action) |
| 1757 | return -ENOMEM; |
| 1758 | |
| 1759 | action->handler = handler; |
Marc Zyngier | 2ed0e64 | 2011-11-16 12:27:39 +0000 | [diff] [blame] | 1760 | action->flags = IRQF_PERCPU | IRQF_NO_SUSPEND; |
Marc Zyngier | 31d9d9b | 2011-09-23 17:03:06 +0100 | [diff] [blame] | 1761 | action->name = devname; |
| 1762 | action->percpu_dev_id = dev_id; |
| 1763 | |
| 1764 | chip_bus_lock(desc); |
| 1765 | retval = __setup_irq(irq, desc, action); |
| 1766 | chip_bus_sync_unlock(desc); |
| 1767 | |
| 1768 | if (retval) |
| 1769 | kfree(action); |
| 1770 | |
| 1771 | return retval; |
| 1772 | } |