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1 : : // SPDX-License-Identifier: GPL-2.0
2 : : /*
3 : : * Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar
4 : : * Copyright (C) 2005-2006 Thomas Gleixner
5 : : *
6 : : * This file contains driver APIs to the irq subsystem.
7 : : */
8 : :
9 : : #define pr_fmt(fmt) "genirq: " fmt
10 : :
11 : : #include <linux/irq.h>
12 : : #include <linux/kthread.h>
13 : : #include <linux/module.h>
14 : : #include <linux/random.h>
15 : : #include <linux/interrupt.h>
16 : : #include <linux/irqdomain.h>
17 : : #include <linux/slab.h>
18 : : #include <linux/sched.h>
19 : : #include <linux/sched/rt.h>
20 : : #include <linux/sched/task.h>
21 : : #include <linux/sched/isolation.h>
22 : : #include <uapi/linux/sched/types.h>
23 : : #include <linux/task_work.h>
24 : :
25 : : #include "internals.h"
26 : :
27 : : #if defined(CONFIG_IRQ_FORCED_THREADING) && !defined(CONFIG_PREEMPT_RT)
28 : : __read_mostly bool force_irqthreads;
29 : : EXPORT_SYMBOL_GPL(force_irqthreads);
30 : :
31 : 0 : static int __init setup_forced_irqthreads(char *arg)
32 : : {
33 : 0 : force_irqthreads = true;
34 : 0 : return 0;
35 : : }
36 : : early_param("threadirqs", setup_forced_irqthreads);
37 : : #endif
38 : :
39 : 13 : static void __synchronize_hardirq(struct irq_desc *desc, bool sync_chip)
40 : : {
41 : 13 : struct irq_data *irqd = irq_desc_get_irq_data(desc);
42 : : bool inprogress;
43 : :
44 : : do {
45 : : unsigned long flags;
46 : :
47 : : /*
48 : : * Wait until we're out of the critical section. This might
49 : : * give the wrong answer due to the lack of memory barriers.
50 : : */
51 [ - + ]: 13 : while (irqd_irq_inprogress(&desc->irq_data))
52 : 0 : cpu_relax();
53 : :
54 : : /* Ok, that indicated we're done: double-check carefully. */
55 : 13 : raw_spin_lock_irqsave(&desc->lock, flags);
56 [ + - ]: 13 : inprogress = irqd_irq_inprogress(&desc->irq_data);
57 : :
58 : : /*
59 : : * If requested and supported, check at the chip whether it
60 : : * is in flight at the hardware level, i.e. already pending
61 : : * in a CPU and waiting for service and acknowledge.
62 : : */
63 [ + - ]: 13 : if (!inprogress && sync_chip) {
64 : : /*
65 : : * Ignore the return code. inprogress is only updated
66 : : * when the chip supports it.
67 : : */
68 : : __irq_get_irqchip_state(irqd, IRQCHIP_STATE_ACTIVE,
69 : : &inprogress);
70 : : }
71 : 13 : raw_spin_unlock_irqrestore(&desc->lock, flags);
72 : :
73 : : /* Oops, that failed? */
74 [ - + ]: 13 : } while (inprogress);
75 : 13 : }
76 : :
77 : : /**
78 : : * synchronize_hardirq - wait for pending hard IRQ handlers (on other CPUs)
79 : : * @irq: interrupt number to wait for
80 : : *
81 : : * This function waits for any pending hard IRQ handlers for this
82 : : * interrupt to complete before returning. If you use this
83 : : * function while holding a resource the IRQ handler may need you
84 : : * will deadlock. It does not take associated threaded handlers
85 : : * into account.
86 : : *
87 : : * Do not use this for shutdown scenarios where you must be sure
88 : : * that all parts (hardirq and threaded handler) have completed.
89 : : *
90 : : * Returns: false if a threaded handler is active.
91 : : *
92 : : * This function may be called - with care - from IRQ context.
93 : : *
94 : : * It does not check whether there is an interrupt in flight at the
95 : : * hardware level, but not serviced yet, as this might deadlock when
96 : : * called with interrupts disabled and the target CPU of the interrupt
97 : : * is the current CPU.
98 : : */
99 : 0 : bool synchronize_hardirq(unsigned int irq)
100 : : {
101 : 0 : struct irq_desc *desc = irq_to_desc(irq);
102 : :
103 [ # # ]: 0 : if (desc) {
104 : 0 : __synchronize_hardirq(desc, false);
105 : 0 : return !atomic_read(&desc->threads_active);
106 : : }
107 : :
108 : : return true;
109 : : }
110 : : EXPORT_SYMBOL(synchronize_hardirq);
111 : :
112 : : /**
113 : : * synchronize_irq - wait for pending IRQ handlers (on other CPUs)
114 : : * @irq: interrupt number to wait for
115 : : *
116 : : * This function waits for any pending IRQ handlers for this interrupt
117 : : * to complete before returning. If you use this function while
118 : : * holding a resource the IRQ handler may need you will deadlock.
119 : : *
120 : : * Can only be called from preemptible code as it might sleep when
121 : : * an interrupt thread is associated to @irq.
122 : : *
123 : : * It optionally makes sure (when the irq chip supports that method)
124 : : * that the interrupt is not pending in any CPU and waiting for
125 : : * service.
126 : : */
127 : 0 : void synchronize_irq(unsigned int irq)
128 : : {
129 : 0 : struct irq_desc *desc = irq_to_desc(irq);
130 : :
131 [ # # ]: 0 : if (desc) {
132 : 0 : __synchronize_hardirq(desc, true);
133 : : /*
134 : : * We made sure that no hardirq handler is
135 : : * running. Now verify that no threaded handlers are
136 : : * active.
137 : : */
138 [ # # # # ]: 0 : wait_event(desc->wait_for_threads,
139 : : !atomic_read(&desc->threads_active));
140 : : }
141 : 0 : }
142 : : EXPORT_SYMBOL(synchronize_irq);
143 : :
144 : : #ifdef CONFIG_SMP
145 : : cpumask_var_t irq_default_affinity;
146 : :
147 : 117 : static bool __irq_can_set_affinity(struct irq_desc *desc)
148 : : {
149 [ + + - - : 117 : if (!desc || !irqd_can_balance(&desc->irq_data) ||
- - - - ]
150 [ + - + - : 104 : !desc->irq_data.chip || !desc->irq_data.chip->irq_set_affinity)
- - - - -
- - - ]
151 : 0 : return false;
152 : : return true;
153 : : }
154 : :
155 : : /**
156 : : * irq_can_set_affinity - Check if the affinity of a given irq can be set
157 : : * @irq: Interrupt to check
158 : : *
159 : : */
160 : 0 : int irq_can_set_affinity(unsigned int irq)
161 : : {
162 : 0 : return __irq_can_set_affinity(irq_to_desc(irq));
163 : : }
164 : :
165 : : /**
166 : : * irq_can_set_affinity_usr - Check if affinity of a irq can be set from user space
167 : : * @irq: Interrupt to check
168 : : *
169 : : * Like irq_can_set_affinity() above, but additionally checks for the
170 : : * AFFINITY_MANAGED flag.
171 : : */
172 : 0 : bool irq_can_set_affinity_usr(unsigned int irq)
173 : : {
174 : 0 : struct irq_desc *desc = irq_to_desc(irq);
175 : :
176 [ # # # # ]: 0 : return __irq_can_set_affinity(desc) &&
177 : : !irqd_affinity_is_managed(&desc->irq_data);
178 : : }
179 : :
180 : : /**
181 : : * irq_set_thread_affinity - Notify irq threads to adjust affinity
182 : : * @desc: irq descriptor which has affitnity changed
183 : : *
184 : : * We just set IRQTF_AFFINITY and delegate the affinity setting
185 : : * to the interrupt thread itself. We can not call
186 : : * set_cpus_allowed_ptr() here as we hold desc->lock and this
187 : : * code can be called from hard interrupt context.
188 : : */
189 : 104 : void irq_set_thread_affinity(struct irq_desc *desc)
190 : : {
191 : 104 : struct irqaction *action;
192 : :
193 [ - + ]: 104 : for_each_action_of_desc(desc, action)
194 [ # # ]: 0 : if (action->thread)
195 : 0 : set_bit(IRQTF_AFFINITY, &action->thread_flags);
196 : 104 : }
197 : :
198 : 104 : static void irq_validate_effective_affinity(struct irq_data *data)
199 : : {
200 : : #ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK
201 [ - + ]: 104 : const struct cpumask *m = irq_data_get_effective_affinity_mask(data);
202 [ - + ]: 104 : struct irq_chip *chip = irq_data_get_irq_chip(data);
203 : :
204 [ - + ]: 104 : if (!cpumask_empty(m))
205 : : return;
206 [ # # ]: 0 : pr_warn_once("irq_chip %s did not update eff. affinity mask of irq %u\n",
207 : : chip->name, data->irq);
208 : : #endif
209 : : }
210 : :
211 : 104 : int irq_do_set_affinity(struct irq_data *data, const struct cpumask *mask,
212 : : bool force)
213 : : {
214 [ + - ]: 104 : struct irq_desc *desc = irq_data_to_desc(data);
215 [ + - ]: 104 : struct irq_chip *chip = irq_data_get_irq_chip(data);
216 : 104 : int ret;
217 : :
218 [ + - + - ]: 104 : if (!chip || !chip->irq_set_affinity)
219 : : return -EINVAL;
220 : :
221 : : /*
222 : : * If this is a managed interrupt and housekeeping is enabled on
223 : : * it check whether the requested affinity mask intersects with
224 : : * a housekeeping CPU. If so, then remove the isolated CPUs from
225 : : * the mask and just keep the housekeeping CPU(s). This prevents
226 : : * the affinity setter from routing the interrupt to an isolated
227 : : * CPU to avoid that I/O submitted from a housekeeping CPU causes
228 : : * interrupts on an isolated one.
229 : : *
230 : : * If the masks do not intersect or include online CPU(s) then
231 : : * keep the requested mask. The isolated target CPUs are only
232 : : * receiving interrupts when the I/O operation was submitted
233 : : * directly from them.
234 : : *
235 : : * If all housekeeping CPUs in the affinity mask are offline, the
236 : : * interrupt will be migrated by the CPU hotplug code once a
237 : : * housekeeping CPU which belongs to the affinity mask comes
238 : : * online.
239 : : */
240 [ - + - - ]: 104 : if (irqd_affinity_is_managed(data) &&
241 : 0 : housekeeping_enabled(HK_FLAG_MANAGED_IRQ)) {
242 : 0 : const struct cpumask *hk_mask, *prog_mask;
243 : :
244 : 0 : static DEFINE_RAW_SPINLOCK(tmp_mask_lock);
245 : 0 : static struct cpumask tmp_mask;
246 : :
247 : 0 : hk_mask = housekeeping_cpumask(HK_FLAG_MANAGED_IRQ);
248 : :
249 : 0 : raw_spin_lock(&tmp_mask_lock);
250 [ # # ]: 0 : cpumask_and(&tmp_mask, mask, hk_mask);
251 [ # # ]: 0 : if (!cpumask_intersects(&tmp_mask, cpu_online_mask))
252 : : prog_mask = mask;
253 : : else
254 : 0 : prog_mask = &tmp_mask;
255 : 0 : ret = chip->irq_set_affinity(data, prog_mask, force);
256 : 0 : raw_spin_unlock(&tmp_mask_lock);
257 : : } else {
258 : 104 : ret = chip->irq_set_affinity(data, mask, force);
259 : : }
260 [ + - - ]: 104 : switch (ret) {
261 : 104 : case IRQ_SET_MASK_OK:
262 : : case IRQ_SET_MASK_OK_DONE:
263 : 104 : cpumask_copy(desc->irq_common_data.affinity, mask);
264 : : /* fall through */
265 : 104 : case IRQ_SET_MASK_OK_NOCOPY:
266 : 104 : irq_validate_effective_affinity(data);
267 : 104 : irq_set_thread_affinity(desc);
268 : 104 : ret = 0;
269 : : }
270 : :
271 : : return ret;
272 : : }
273 : :
274 : : #ifdef CONFIG_GENERIC_PENDING_IRQ
275 : 0 : static inline int irq_set_affinity_pending(struct irq_data *data,
276 : : const struct cpumask *dest)
277 : : {
278 : 0 : struct irq_desc *desc = irq_data_to_desc(data);
279 : :
280 : 0 : irqd_set_move_pending(data);
281 : 0 : irq_copy_pending(desc, dest);
282 : 0 : return 0;
283 : : }
284 : : #else
285 : : static inline int irq_set_affinity_pending(struct irq_data *data,
286 : : const struct cpumask *dest)
287 : : {
288 : : return -EBUSY;
289 : : }
290 : : #endif
291 : :
292 : 0 : static int irq_try_set_affinity(struct irq_data *data,
293 : : const struct cpumask *dest, bool force)
294 : : {
295 : 0 : int ret = irq_do_set_affinity(data, dest, force);
296 : :
297 : : /*
298 : : * In case that the underlying vector management is busy and the
299 : : * architecture supports the generic pending mechanism then utilize
300 : : * this to avoid returning an error to user space.
301 : : */
302 [ # # ]: 0 : if (ret == -EBUSY && !force)
303 : 0 : ret = irq_set_affinity_pending(data, dest);
304 : 0 : return ret;
305 : : }
306 : :
307 : 0 : int irq_set_affinity_locked(struct irq_data *data, const struct cpumask *mask,
308 : : bool force)
309 : : {
310 [ # # ]: 0 : struct irq_chip *chip = irq_data_get_irq_chip(data);
311 [ # # ]: 0 : struct irq_desc *desc = irq_data_to_desc(data);
312 : 0 : int ret = 0;
313 : :
314 [ # # # # ]: 0 : if (!chip || !chip->irq_set_affinity)
315 : : return -EINVAL;
316 : :
317 [ # # # # ]: 0 : if (irq_can_move_pcntxt(data) && !irqd_is_setaffinity_pending(data)) {
318 : 0 : ret = irq_try_set_affinity(data, mask, force);
319 : : } else {
320 : 0 : irqd_set_move_pending(data);
321 : 0 : irq_copy_pending(desc, mask);
322 : : }
323 : :
324 [ # # ]: 0 : if (desc->affinity_notify) {
325 : 0 : kref_get(&desc->affinity_notify->kref);
326 [ # # ]: 0 : if (!schedule_work(&desc->affinity_notify->work)) {
327 : : /* Work was already scheduled, drop our extra ref */
328 : 0 : kref_put(&desc->affinity_notify->kref,
329 : 0 : desc->affinity_notify->release);
330 : : }
331 : : }
332 : 0 : irqd_set(data, IRQD_AFFINITY_SET);
333 : :
334 : 0 : return ret;
335 : : }
336 : :
337 : 0 : int __irq_set_affinity(unsigned int irq, const struct cpumask *mask, bool force)
338 : : {
339 : 0 : struct irq_desc *desc = irq_to_desc(irq);
340 : 0 : unsigned long flags;
341 : 0 : int ret;
342 : :
343 [ # # ]: 0 : if (!desc)
344 : : return -EINVAL;
345 : :
346 : 0 : raw_spin_lock_irqsave(&desc->lock, flags);
347 : 0 : ret = irq_set_affinity_locked(irq_desc_get_irq_data(desc), mask, force);
348 : 0 : raw_spin_unlock_irqrestore(&desc->lock, flags);
349 : 0 : return ret;
350 : : }
351 : :
352 : 0 : int irq_set_affinity_hint(unsigned int irq, const struct cpumask *m)
353 : : {
354 : 0 : unsigned long flags;
355 : 0 : struct irq_desc *desc = irq_get_desc_lock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL);
356 : :
357 [ # # ]: 0 : if (!desc)
358 : : return -EINVAL;
359 : 0 : desc->affinity_hint = m;
360 : 0 : irq_put_desc_unlock(desc, flags);
361 : : /* set the initial affinity to prevent every interrupt being on CPU0 */
362 [ # # ]: 0 : if (m)
363 : 0 : __irq_set_affinity(irq, m, false);
364 : : return 0;
365 : : }
366 : : EXPORT_SYMBOL_GPL(irq_set_affinity_hint);
367 : :
368 : 0 : static void irq_affinity_notify(struct work_struct *work)
369 : : {
370 : 0 : struct irq_affinity_notify *notify =
371 : 0 : container_of(work, struct irq_affinity_notify, work);
372 : 0 : struct irq_desc *desc = irq_to_desc(notify->irq);
373 : 0 : cpumask_var_t cpumask;
374 : 0 : unsigned long flags;
375 : :
376 [ # # ]: 0 : if (!desc || !alloc_cpumask_var(&cpumask, GFP_KERNEL))
377 : 0 : goto out;
378 : :
379 : 0 : raw_spin_lock_irqsave(&desc->lock, flags);
380 [ # # ]: 0 : if (irq_move_pending(&desc->irq_data))
381 : 0 : irq_get_pending(cpumask, desc);
382 : : else
383 : 0 : cpumask_copy(cpumask, desc->irq_common_data.affinity);
384 : 0 : raw_spin_unlock_irqrestore(&desc->lock, flags);
385 : :
386 : 0 : notify->notify(notify, cpumask);
387 : :
388 : 0 : free_cpumask_var(cpumask);
389 : 0 : out:
390 : 0 : kref_put(¬ify->kref, notify->release);
391 : 0 : }
392 : :
393 : : /**
394 : : * irq_set_affinity_notifier - control notification of IRQ affinity changes
395 : : * @irq: Interrupt for which to enable/disable notification
396 : : * @notify: Context for notification, or %NULL to disable
397 : : * notification. Function pointers must be initialised;
398 : : * the other fields will be initialised by this function.
399 : : *
400 : : * Must be called in process context. Notification may only be enabled
401 : : * after the IRQ is allocated and must be disabled before the IRQ is
402 : : * freed using free_irq().
403 : : */
404 : : int
405 : 0 : irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify)
406 : : {
407 : 0 : struct irq_desc *desc = irq_to_desc(irq);
408 : 0 : struct irq_affinity_notify *old_notify;
409 : 0 : unsigned long flags;
410 : :
411 : : /* The release function is promised process context */
412 : 0 : might_sleep();
413 : :
414 [ # # # # ]: 0 : if (!desc || desc->istate & IRQS_NMI)
415 : : return -EINVAL;
416 : :
417 : : /* Complete initialisation of *notify */
418 [ # # ]: 0 : if (notify) {
419 : 0 : notify->irq = irq;
420 : 0 : kref_init(¬ify->kref);
421 : 0 : INIT_WORK(¬ify->work, irq_affinity_notify);
422 : : }
423 : :
424 : 0 : raw_spin_lock_irqsave(&desc->lock, flags);
425 : 0 : old_notify = desc->affinity_notify;
426 : 0 : desc->affinity_notify = notify;
427 : 0 : raw_spin_unlock_irqrestore(&desc->lock, flags);
428 : :
429 [ # # ]: 0 : if (old_notify) {
430 [ # # ]: 0 : if (cancel_work_sync(&old_notify->work)) {
431 : : /* Pending work had a ref, put that one too */
432 : 0 : kref_put(&old_notify->kref, old_notify->release);
433 : : }
434 : 0 : kref_put(&old_notify->kref, old_notify->release);
435 : : }
436 : :
437 : : return 0;
438 : : }
439 : : EXPORT_SYMBOL_GPL(irq_set_affinity_notifier);
440 : :
441 : : #ifndef CONFIG_AUTO_IRQ_AFFINITY
442 : : /*
443 : : * Generic version of the affinity autoselector.
444 : : */
445 : 117 : int irq_setup_affinity(struct irq_desc *desc)
446 : : {
447 : 117 : struct cpumask *set = irq_default_affinity;
448 [ + - ]: 117 : int ret, node = irq_desc_get_node(desc);
449 : 117 : static DEFINE_RAW_SPINLOCK(mask_lock);
450 : 117 : static struct cpumask mask;
451 : :
452 : : /* Excludes PER_CPU and NO_BALANCE interrupts */
453 [ + - ]: 117 : if (!__irq_can_set_affinity(desc))
454 : : return 0;
455 : :
456 : 104 : raw_spin_lock(&mask_lock);
457 : : /*
458 : : * Preserve the managed affinity setting and a userspace affinity
459 : : * setup, but make sure that one of the targets is online.
460 : : */
461 [ + - - + ]: 104 : if (irqd_affinity_is_managed(&desc->irq_data) ||
462 : : irqd_has_set(&desc->irq_data, IRQD_AFFINITY_SET)) {
463 [ # # ]: 0 : if (cpumask_intersects(desc->irq_common_data.affinity,
464 : : cpu_online_mask))
465 : 0 : set = desc->irq_common_data.affinity;
466 : : else
467 : 0 : irqd_clear(&desc->irq_data, IRQD_AFFINITY_SET);
468 : : }
469 : :
470 [ - + ]: 104 : cpumask_and(&mask, cpu_online_mask, set);
471 [ - + ]: 104 : if (cpumask_empty(&mask))
472 : 0 : cpumask_copy(&mask, cpu_online_mask);
473 : :
474 [ + - ]: 104 : if (node != NUMA_NO_NODE) {
475 [ + - ]: 104 : const struct cpumask *nodemask = cpumask_of_node(node);
476 : :
477 : : /* make sure at least one of the cpus in nodemask is online */
478 [ + - ]: 104 : if (cpumask_intersects(&mask, nodemask))
479 : 104 : cpumask_and(&mask, &mask, nodemask);
480 : : }
481 : 104 : ret = irq_do_set_affinity(&desc->irq_data, &mask, false);
482 : 104 : raw_spin_unlock(&mask_lock);
483 : 104 : return ret;
484 : : }
485 : : #else
486 : : /* Wrapper for ALPHA specific affinity selector magic */
487 : : int irq_setup_affinity(struct irq_desc *desc)
488 : : {
489 : : return irq_select_affinity(irq_desc_get_irq(desc));
490 : : }
491 : : #endif /* CONFIG_AUTO_IRQ_AFFINITY */
492 : : #endif /* CONFIG_SMP */
493 : :
494 : :
495 : : /**
496 : : * irq_set_vcpu_affinity - Set vcpu affinity for the interrupt
497 : : * @irq: interrupt number to set affinity
498 : : * @vcpu_info: vCPU specific data or pointer to a percpu array of vCPU
499 : : * specific data for percpu_devid interrupts
500 : : *
501 : : * This function uses the vCPU specific data to set the vCPU
502 : : * affinity for an irq. The vCPU specific data is passed from
503 : : * outside, such as KVM. One example code path is as below:
504 : : * KVM -> IOMMU -> irq_set_vcpu_affinity().
505 : : */
506 : 0 : int irq_set_vcpu_affinity(unsigned int irq, void *vcpu_info)
507 : : {
508 : 0 : unsigned long flags;
509 : 0 : struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
510 : 0 : struct irq_data *data;
511 : 0 : struct irq_chip *chip;
512 : 0 : int ret = -ENOSYS;
513 : :
514 [ # # ]: 0 : if (!desc)
515 : : return -EINVAL;
516 : :
517 : 0 : data = irq_desc_get_irq_data(desc);
518 : 0 : do {
519 [ # # ]: 0 : chip = irq_data_get_irq_chip(data);
520 [ # # # # ]: 0 : if (chip && chip->irq_set_vcpu_affinity)
521 : : break;
522 : : #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
523 : 0 : data = data->parent_data;
524 : : #else
525 : : data = NULL;
526 : : #endif
527 [ # # ]: 0 : } while (data);
528 : :
529 [ # # ]: 0 : if (data)
530 : 0 : ret = chip->irq_set_vcpu_affinity(data, vcpu_info);
531 : 0 : irq_put_desc_unlock(desc, flags);
532 : :
533 : 0 : return ret;
534 : : }
535 : : EXPORT_SYMBOL_GPL(irq_set_vcpu_affinity);
536 : :
537 : 0 : void __disable_irq(struct irq_desc *desc)
538 : : {
539 [ # # ]: 0 : if (!desc->depth++)
540 : 0 : irq_disable(desc);
541 : 0 : }
542 : :
543 : 0 : static int __disable_irq_nosync(unsigned int irq)
544 : : {
545 : 0 : unsigned long flags;
546 : 0 : struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL);
547 : :
548 [ # # ]: 0 : if (!desc)
549 : : return -EINVAL;
550 [ # # ]: 0 : __disable_irq(desc);
551 : 0 : irq_put_desc_busunlock(desc, flags);
552 : 0 : return 0;
553 : : }
554 : :
555 : : /**
556 : : * disable_irq_nosync - disable an irq without waiting
557 : : * @irq: Interrupt to disable
558 : : *
559 : : * Disable the selected interrupt line. Disables and Enables are
560 : : * nested.
561 : : * Unlike disable_irq(), this function does not ensure existing
562 : : * instances of the IRQ handler have completed before returning.
563 : : *
564 : : * This function may be called from IRQ context.
565 : : */
566 : 0 : void disable_irq_nosync(unsigned int irq)
567 : : {
568 : 0 : __disable_irq_nosync(irq);
569 : 0 : }
570 : : EXPORT_SYMBOL(disable_irq_nosync);
571 : :
572 : : /**
573 : : * disable_irq - disable an irq and wait for completion
574 : : * @irq: Interrupt to disable
575 : : *
576 : : * Disable the selected interrupt line. Enables and Disables are
577 : : * nested.
578 : : * This function waits for any pending IRQ handlers for this interrupt
579 : : * to complete before returning. If you use this function while
580 : : * holding a resource the IRQ handler may need you will deadlock.
581 : : *
582 : : * This function may be called - with care - from IRQ context.
583 : : */
584 : 0 : void disable_irq(unsigned int irq)
585 : : {
586 [ # # ]: 0 : if (!__disable_irq_nosync(irq))
587 : 0 : synchronize_irq(irq);
588 : 0 : }
589 : : EXPORT_SYMBOL(disable_irq);
590 : :
591 : : /**
592 : : * disable_hardirq - disables an irq and waits for hardirq completion
593 : : * @irq: Interrupt to disable
594 : : *
595 : : * Disable the selected interrupt line. Enables and Disables are
596 : : * nested.
597 : : * This function waits for any pending hard IRQ handlers for this
598 : : * interrupt to complete before returning. If you use this function while
599 : : * holding a resource the hard IRQ handler may need you will deadlock.
600 : : *
601 : : * When used to optimistically disable an interrupt from atomic context
602 : : * the return value must be checked.
603 : : *
604 : : * Returns: false if a threaded handler is active.
605 : : *
606 : : * This function may be called - with care - from IRQ context.
607 : : */
608 : 0 : bool disable_hardirq(unsigned int irq)
609 : : {
610 [ # # ]: 0 : if (!__disable_irq_nosync(irq))
611 : 0 : return synchronize_hardirq(irq);
612 : :
613 : : return false;
614 : : }
615 : : EXPORT_SYMBOL_GPL(disable_hardirq);
616 : :
617 : : /**
618 : : * disable_nmi_nosync - disable an nmi without waiting
619 : : * @irq: Interrupt to disable
620 : : *
621 : : * Disable the selected interrupt line. Disables and enables are
622 : : * nested.
623 : : * The interrupt to disable must have been requested through request_nmi.
624 : : * Unlike disable_nmi(), this function does not ensure existing
625 : : * instances of the IRQ handler have completed before returning.
626 : : */
627 : 0 : void disable_nmi_nosync(unsigned int irq)
628 : : {
629 : 0 : disable_irq_nosync(irq);
630 : 0 : }
631 : :
632 : 0 : void __enable_irq(struct irq_desc *desc)
633 : : {
634 [ # # # ]: 0 : switch (desc->depth) {
635 : : case 0:
636 : 0 : err_out:
637 : 0 : WARN(1, KERN_WARNING "Unbalanced enable for IRQ %d\n",
638 : : irq_desc_get_irq(desc));
639 : 0 : break;
640 : 0 : case 1: {
641 [ # # ]: 0 : if (desc->istate & IRQS_SUSPENDED)
642 : 0 : goto err_out;
643 : : /* Prevent probing on this irq: */
644 : 0 : irq_settings_set_noprobe(desc);
645 : : /*
646 : : * Call irq_startup() not irq_enable() here because the
647 : : * interrupt might be marked NOAUTOEN. So irq_startup()
648 : : * needs to be invoked when it gets enabled the first
649 : : * time. If it was already started up, then irq_startup()
650 : : * will invoke irq_enable() under the hood.
651 : : */
652 : 0 : irq_startup(desc, IRQ_RESEND, IRQ_START_FORCE);
653 : 0 : break;
654 : : }
655 : 0 : default:
656 : 0 : desc->depth--;
657 : : }
658 : 0 : }
659 : :
660 : : /**
661 : : * enable_irq - enable handling of an irq
662 : : * @irq: Interrupt to enable
663 : : *
664 : : * Undoes the effect of one call to disable_irq(). If this
665 : : * matches the last disable, processing of interrupts on this
666 : : * IRQ line is re-enabled.
667 : : *
668 : : * This function may be called from IRQ context only when
669 : : * desc->irq_data.chip->bus_lock and desc->chip->bus_sync_unlock are NULL !
670 : : */
671 : 0 : void enable_irq(unsigned int irq)
672 : : {
673 : 0 : unsigned long flags;
674 : 0 : struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL);
675 : :
676 [ # # ]: 0 : if (!desc)
677 : 0 : return;
678 [ # # # # ]: 0 : if (WARN(!desc->irq_data.chip,
679 : : KERN_ERR "enable_irq before setup/request_irq: irq %u\n", irq))
680 : 0 : goto out;
681 : :
682 : 0 : __enable_irq(desc);
683 : 0 : out:
684 : 0 : irq_put_desc_busunlock(desc, flags);
685 : : }
686 : : EXPORT_SYMBOL(enable_irq);
687 : :
688 : : /**
689 : : * enable_nmi - enable handling of an nmi
690 : : * @irq: Interrupt to enable
691 : : *
692 : : * The interrupt to enable must have been requested through request_nmi.
693 : : * Undoes the effect of one call to disable_nmi(). If this
694 : : * matches the last disable, processing of interrupts on this
695 : : * IRQ line is re-enabled.
696 : : */
697 : 0 : void enable_nmi(unsigned int irq)
698 : : {
699 : 0 : enable_irq(irq);
700 : 0 : }
701 : :
702 : 0 : static int set_irq_wake_real(unsigned int irq, unsigned int on)
703 : : {
704 : 0 : struct irq_desc *desc = irq_to_desc(irq);
705 : 0 : int ret = -ENXIO;
706 : :
707 [ # # ]: 0 : if (irq_desc_get_chip(desc)->flags & IRQCHIP_SKIP_SET_WAKE)
708 : : return 0;
709 : :
710 [ # # ]: 0 : if (desc->irq_data.chip->irq_set_wake)
711 : 0 : ret = desc->irq_data.chip->irq_set_wake(&desc->irq_data, on);
712 : :
713 : : return ret;
714 : : }
715 : :
716 : : /**
717 : : * irq_set_irq_wake - control irq power management wakeup
718 : : * @irq: interrupt to control
719 : : * @on: enable/disable power management wakeup
720 : : *
721 : : * Enable/disable power management wakeup mode, which is
722 : : * disabled by default. Enables and disables must match,
723 : : * just as they match for non-wakeup mode support.
724 : : *
725 : : * Wakeup mode lets this IRQ wake the system from sleep
726 : : * states like "suspend to RAM".
727 : : *
728 : : * Note: irq enable/disable state is completely orthogonal
729 : : * to the enable/disable state of irq wake. An irq can be
730 : : * disabled with disable_irq() and still wake the system as
731 : : * long as the irq has wake enabled. If this does not hold,
732 : : * then the underlying irq chip and the related driver need
733 : : * to be investigated.
734 : : */
735 : 0 : int irq_set_irq_wake(unsigned int irq, unsigned int on)
736 : : {
737 : 0 : unsigned long flags;
738 : 0 : struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL);
739 : 0 : int ret = 0;
740 : :
741 [ # # ]: 0 : if (!desc)
742 : : return -EINVAL;
743 : :
744 : : /* Don't use NMIs as wake up interrupts please */
745 [ # # ]: 0 : if (desc->istate & IRQS_NMI) {
746 : 0 : ret = -EINVAL;
747 : 0 : goto out_unlock;
748 : : }
749 : :
750 : : /* wakeup-capable irqs can be shared between drivers that
751 : : * don't need to have the same sleep mode behaviors.
752 : : */
753 [ # # ]: 0 : if (on) {
754 [ # # ]: 0 : if (desc->wake_depth++ == 0) {
755 : 0 : ret = set_irq_wake_real(irq, on);
756 [ # # ]: 0 : if (ret)
757 : 0 : desc->wake_depth = 0;
758 : : else
759 : 0 : irqd_set(&desc->irq_data, IRQD_WAKEUP_STATE);
760 : : }
761 : : } else {
762 [ # # ]: 0 : if (desc->wake_depth == 0) {
763 : 0 : WARN(1, "Unbalanced IRQ %d wake disable\n", irq);
764 [ # # ]: 0 : } else if (--desc->wake_depth == 0) {
765 : 0 : ret = set_irq_wake_real(irq, on);
766 [ # # ]: 0 : if (ret)
767 : 0 : desc->wake_depth = 1;
768 : : else
769 : 0 : irqd_clear(&desc->irq_data, IRQD_WAKEUP_STATE);
770 : : }
771 : : }
772 : :
773 : 0 : out_unlock:
774 : 0 : irq_put_desc_busunlock(desc, flags);
775 : 0 : return ret;
776 : : }
777 : : EXPORT_SYMBOL(irq_set_irq_wake);
778 : :
779 : : /*
780 : : * Internal function that tells the architecture code whether a
781 : : * particular irq has been exclusively allocated or is available
782 : : * for driver use.
783 : : */
784 : 0 : int can_request_irq(unsigned int irq, unsigned long irqflags)
785 : : {
786 : 0 : unsigned long flags;
787 : 0 : struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
788 : 0 : int canrequest = 0;
789 : :
790 [ # # ]: 0 : if (!desc)
791 : : return 0;
792 : :
793 [ # # ]: 0 : if (irq_settings_can_request(desc)) {
794 [ # # ]: 0 : if (!desc->action ||
795 [ # # ]: 0 : irqflags & desc->action->flags & IRQF_SHARED)
796 : 0 : canrequest = 1;
797 : : }
798 : 0 : irq_put_desc_unlock(desc, flags);
799 : 0 : return canrequest;
800 : : }
801 : :
802 : 0 : int __irq_set_trigger(struct irq_desc *desc, unsigned long flags)
803 : : {
804 : 0 : struct irq_chip *chip = desc->irq_data.chip;
805 : 0 : int ret, unmask = 0;
806 : :
807 [ # # # # ]: 0 : if (!chip || !chip->irq_set_type) {
808 : : /*
809 : : * IRQF_TRIGGER_* but the PIC does not support multiple
810 : : * flow-types?
811 : : */
812 : : pr_debug("No set_type function for IRQ %d (%s)\n",
813 : : irq_desc_get_irq(desc),
814 : : chip ? (chip->name ? : "unknown") : "unknown");
815 : : return 0;
816 : : }
817 : :
818 [ # # ]: 0 : if (chip->flags & IRQCHIP_SET_TYPE_MASKED) {
819 [ # # ]: 0 : if (!irqd_irq_masked(&desc->irq_data))
820 : 0 : mask_irq(desc);
821 [ # # ]: 0 : if (!irqd_irq_disabled(&desc->irq_data))
822 : 0 : unmask = 1;
823 : : }
824 : :
825 : : /* Mask all flags except trigger mode */
826 : 0 : flags &= IRQ_TYPE_SENSE_MASK;
827 : 0 : ret = chip->irq_set_type(&desc->irq_data, flags);
828 : :
829 [ # # # ]: 0 : switch (ret) {
830 : 0 : case IRQ_SET_MASK_OK:
831 : : case IRQ_SET_MASK_OK_DONE:
832 : 0 : irqd_clear(&desc->irq_data, IRQD_TRIGGER_MASK);
833 : 0 : irqd_set(&desc->irq_data, flags);
834 : : /* fall through */
835 : :
836 : 0 : case IRQ_SET_MASK_OK_NOCOPY:
837 [ # # ]: 0 : flags = irqd_get_trigger_type(&desc->irq_data);
838 [ # # ]: 0 : irq_settings_set_trigger_mask(desc, flags);
839 [ # # ]: 0 : irqd_clear(&desc->irq_data, IRQD_LEVEL);
840 [ # # ]: 0 : irq_settings_clr_level(desc);
841 [ # # ]: 0 : if (flags & IRQ_TYPE_LEVEL_MASK) {
842 : 0 : irq_settings_set_level(desc);
843 : 0 : irqd_set(&desc->irq_data, IRQD_LEVEL);
844 : : }
845 : :
846 : : ret = 0;
847 : : break;
848 : 0 : default:
849 : 0 : pr_err("Setting trigger mode %lu for irq %u failed (%pS)\n",
850 : : flags, irq_desc_get_irq(desc), chip->irq_set_type);
851 : : }
852 [ # # ]: 0 : if (unmask)
853 : 0 : unmask_irq(desc);
854 : : return ret;
855 : : }
856 : :
857 : : #ifdef CONFIG_HARDIRQS_SW_RESEND
858 : : int irq_set_parent(int irq, int parent_irq)
859 : : {
860 : : unsigned long flags;
861 : : struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
862 : :
863 : : if (!desc)
864 : : return -EINVAL;
865 : :
866 : : desc->parent_irq = parent_irq;
867 : :
868 : : irq_put_desc_unlock(desc, flags);
869 : : return 0;
870 : : }
871 : : EXPORT_SYMBOL_GPL(irq_set_parent);
872 : : #endif
873 : :
874 : : /*
875 : : * Default primary interrupt handler for threaded interrupts. Is
876 : : * assigned as primary handler when request_threaded_irq is called
877 : : * with handler == NULL. Useful for oneshot interrupts.
878 : : */
879 : 0 : static irqreturn_t irq_default_primary_handler(int irq, void *dev_id)
880 : : {
881 : 0 : return IRQ_WAKE_THREAD;
882 : : }
883 : :
884 : : /*
885 : : * Primary handler for nested threaded interrupts. Should never be
886 : : * called.
887 : : */
888 : 0 : static irqreturn_t irq_nested_primary_handler(int irq, void *dev_id)
889 : : {
890 : 0 : WARN(1, "Primary handler called for nested irq %d\n", irq);
891 : 0 : return IRQ_NONE;
892 : : }
893 : :
894 : 0 : static irqreturn_t irq_forced_secondary_handler(int irq, void *dev_id)
895 : : {
896 : 0 : WARN(1, "Secondary action handler called for irq %d\n", irq);
897 : 0 : return IRQ_NONE;
898 : : }
899 : :
900 : 0 : static int irq_wait_for_interrupt(struct irqaction *action)
901 : : {
902 : 0 : for (;;) {
903 : 0 : set_current_state(TASK_INTERRUPTIBLE);
904 : :
905 [ # # ]: 0 : if (kthread_should_stop()) {
906 : : /* may need to run one last time */
907 [ # # ]: 0 : if (test_and_clear_bit(IRQTF_RUNTHREAD,
908 : 0 : &action->thread_flags)) {
909 : 0 : __set_current_state(TASK_RUNNING);
910 : 0 : return 0;
911 : : }
912 : 0 : __set_current_state(TASK_RUNNING);
913 : 0 : return -1;
914 : : }
915 : :
916 [ # # ]: 0 : if (test_and_clear_bit(IRQTF_RUNTHREAD,
917 : 0 : &action->thread_flags)) {
918 : 0 : __set_current_state(TASK_RUNNING);
919 : 0 : return 0;
920 : : }
921 : 0 : schedule();
922 : : }
923 : : }
924 : :
925 : : /*
926 : : * Oneshot interrupts keep the irq line masked until the threaded
927 : : * handler finished. unmask if the interrupt has not been disabled and
928 : : * is marked MASKED.
929 : : */
930 : 0 : static void irq_finalize_oneshot(struct irq_desc *desc,
931 : : struct irqaction *action)
932 : : {
933 [ # # ]: 0 : if (!(desc->istate & IRQS_ONESHOT) ||
934 [ # # ]: 0 : action->handler == irq_forced_secondary_handler)
935 : : return;
936 : 0 : again:
937 [ # # ]: 0 : chip_bus_lock(desc);
938 : 0 : raw_spin_lock_irq(&desc->lock);
939 : :
940 : : /*
941 : : * Implausible though it may be we need to protect us against
942 : : * the following scenario:
943 : : *
944 : : * The thread is faster done than the hard interrupt handler
945 : : * on the other CPU. If we unmask the irq line then the
946 : : * interrupt can come in again and masks the line, leaves due
947 : : * to IRQS_INPROGRESS and the irq line is masked forever.
948 : : *
949 : : * This also serializes the state of shared oneshot handlers
950 : : * versus "desc->threads_onehsot |= action->thread_mask;" in
951 : : * irq_wake_thread(). See the comment there which explains the
952 : : * serialization.
953 : : */
954 [ # # ]: 0 : if (unlikely(irqd_irq_inprogress(&desc->irq_data))) {
955 : 0 : raw_spin_unlock_irq(&desc->lock);
956 [ # # ]: 0 : chip_bus_sync_unlock(desc);
957 : 0 : cpu_relax();
958 : 0 : goto again;
959 : : }
960 : :
961 : : /*
962 : : * Now check again, whether the thread should run. Otherwise
963 : : * we would clear the threads_oneshot bit of this thread which
964 : : * was just set.
965 : : */
966 [ # # ]: 0 : if (test_bit(IRQTF_RUNTHREAD, &action->thread_flags))
967 : 0 : goto out_unlock;
968 : :
969 : 0 : desc->threads_oneshot &= ~action->thread_mask;
970 : :
971 [ # # # # : 0 : if (!desc->threads_oneshot && !irqd_irq_disabled(&desc->irq_data) &&
# # ]
972 : : irqd_irq_masked(&desc->irq_data))
973 : 0 : unmask_threaded_irq(desc);
974 : :
975 : 0 : out_unlock:
976 : 0 : raw_spin_unlock_irq(&desc->lock);
977 [ # # ]: 0 : chip_bus_sync_unlock(desc);
978 : : }
979 : :
980 : : #ifdef CONFIG_SMP
981 : : /*
982 : : * Check whether we need to change the affinity of the interrupt thread.
983 : : */
984 : : static void
985 : 0 : irq_thread_check_affinity(struct irq_desc *desc, struct irqaction *action)
986 : : {
987 : 0 : cpumask_var_t mask;
988 : 0 : bool valid = true;
989 : :
990 [ # # ]: 0 : if (!test_and_clear_bit(IRQTF_AFFINITY, &action->thread_flags))
991 : 0 : return;
992 : :
993 : : /*
994 : : * In case we are out of memory we set IRQTF_AFFINITY again and
995 : : * try again next time
996 : : */
997 : 0 : if (!alloc_cpumask_var(&mask, GFP_KERNEL)) {
998 : : set_bit(IRQTF_AFFINITY, &action->thread_flags);
999 : : return;
1000 : : }
1001 : :
1002 : 0 : raw_spin_lock_irq(&desc->lock);
1003 : : /*
1004 : : * This code is triggered unconditionally. Check the affinity
1005 : : * mask pointer. For CPU_MASK_OFFSTACK=n this is optimized out.
1006 : : */
1007 : 0 : if (cpumask_available(desc->irq_common_data.affinity)) {
1008 : 0 : const struct cpumask *m;
1009 : :
1010 : 0 : m = irq_data_get_effective_affinity_mask(&desc->irq_data);
1011 : 0 : cpumask_copy(mask, m);
1012 : : } else {
1013 : : valid = false;
1014 : : }
1015 : 0 : raw_spin_unlock_irq(&desc->lock);
1016 : :
1017 : 0 : if (valid)
1018 : 0 : set_cpus_allowed_ptr(current, mask);
1019 : 0 : free_cpumask_var(mask);
1020 : : }
1021 : : #else
1022 : : static inline void
1023 : : irq_thread_check_affinity(struct irq_desc *desc, struct irqaction *action) { }
1024 : : #endif
1025 : :
1026 : : /*
1027 : : * Interrupts which are not explicitly requested as threaded
1028 : : * interrupts rely on the implicit bh/preempt disable of the hard irq
1029 : : * context. So we need to disable bh here to avoid deadlocks and other
1030 : : * side effects.
1031 : : */
1032 : : static irqreturn_t
1033 : 0 : irq_forced_thread_fn(struct irq_desc *desc, struct irqaction *action)
1034 : : {
1035 : 0 : irqreturn_t ret;
1036 : :
1037 : 0 : local_bh_disable();
1038 : 0 : ret = action->thread_fn(action->irq, action->dev_id);
1039 [ # # ]: 0 : if (ret == IRQ_HANDLED)
1040 : 0 : atomic_inc(&desc->threads_handled);
1041 : :
1042 : 0 : irq_finalize_oneshot(desc, action);
1043 : 0 : local_bh_enable();
1044 : 0 : return ret;
1045 : : }
1046 : :
1047 : : /*
1048 : : * Interrupts explicitly requested as threaded interrupts want to be
1049 : : * preemtible - many of them need to sleep and wait for slow busses to
1050 : : * complete.
1051 : : */
1052 : 0 : static irqreturn_t irq_thread_fn(struct irq_desc *desc,
1053 : : struct irqaction *action)
1054 : : {
1055 : 0 : irqreturn_t ret;
1056 : :
1057 : 0 : ret = action->thread_fn(action->irq, action->dev_id);
1058 [ # # ]: 0 : if (ret == IRQ_HANDLED)
1059 : 0 : atomic_inc(&desc->threads_handled);
1060 : :
1061 : 0 : irq_finalize_oneshot(desc, action);
1062 : 0 : return ret;
1063 : : }
1064 : :
1065 : 0 : static void wake_threads_waitq(struct irq_desc *desc)
1066 : : {
1067 [ # # ]: 0 : if (atomic_dec_and_test(&desc->threads_active))
1068 : 0 : wake_up(&desc->wait_for_threads);
1069 : 0 : }
1070 : :
1071 : 0 : static void irq_thread_dtor(struct callback_head *unused)
1072 : : {
1073 [ # # ]: 0 : struct task_struct *tsk = current;
1074 : 0 : struct irq_desc *desc;
1075 : 0 : struct irqaction *action;
1076 : :
1077 [ # # # # ]: 0 : if (WARN_ON_ONCE(!(current->flags & PF_EXITING)))
1078 : : return;
1079 : :
1080 : 0 : action = kthread_data(tsk);
1081 : :
1082 : 0 : pr_err("exiting task \"%s\" (%d) is an active IRQ thread (irq %d)\n",
1083 : : tsk->comm, tsk->pid, action->irq);
1084 : :
1085 : :
1086 : 0 : desc = irq_to_desc(action->irq);
1087 : : /*
1088 : : * If IRQTF_RUNTHREAD is set, we need to decrement
1089 : : * desc->threads_active and wake possible waiters.
1090 : : */
1091 [ # # ]: 0 : if (test_and_clear_bit(IRQTF_RUNTHREAD, &action->thread_flags))
1092 : 0 : wake_threads_waitq(desc);
1093 : :
1094 : : /* Prevent a stale desc->threads_oneshot */
1095 : 0 : irq_finalize_oneshot(desc, action);
1096 : : }
1097 : :
1098 : : static void irq_wake_secondary(struct irq_desc *desc, struct irqaction *action)
1099 : : {
1100 : : struct irqaction *secondary = action->secondary;
1101 : :
1102 : : if (WARN_ON_ONCE(!secondary))
1103 : : return;
1104 : :
1105 : : raw_spin_lock_irq(&desc->lock);
1106 : : __irq_wake_thread(desc, secondary);
1107 : : raw_spin_unlock_irq(&desc->lock);
1108 : : }
1109 : :
1110 : : /*
1111 : : * Interrupt handler thread
1112 : : */
1113 : 0 : static int irq_thread(void *data)
1114 : : {
1115 : 0 : struct callback_head on_exit_work;
1116 : 0 : struct irqaction *action = data;
1117 : 0 : struct irq_desc *desc = irq_to_desc(action->irq);
1118 : 0 : irqreturn_t (*handler_fn)(struct irq_desc *desc,
1119 : : struct irqaction *action);
1120 : :
1121 [ # # # # ]: 0 : if (force_irqthreads && test_bit(IRQTF_FORCED_THREAD,
1122 : 0 : &action->thread_flags))
1123 : : handler_fn = irq_forced_thread_fn;
1124 : : else
1125 : : handler_fn = irq_thread_fn;
1126 : :
1127 : 0 : init_task_work(&on_exit_work, irq_thread_dtor);
1128 : 0 : task_work_add(current, &on_exit_work, false);
1129 : :
1130 : 0 : irq_thread_check_affinity(desc, action);
1131 : :
1132 [ # # ]: 0 : while (!irq_wait_for_interrupt(action)) {
1133 : 0 : irqreturn_t action_ret;
1134 : :
1135 : 0 : irq_thread_check_affinity(desc, action);
1136 : :
1137 : 0 : action_ret = handler_fn(desc, action);
1138 [ # # ]: 0 : if (action_ret == IRQ_WAKE_THREAD)
1139 : 0 : irq_wake_secondary(desc, action);
1140 : :
1141 : 0 : wake_threads_waitq(desc);
1142 : : }
1143 : :
1144 : : /*
1145 : : * This is the regular exit path. __free_irq() is stopping the
1146 : : * thread via kthread_stop() after calling
1147 : : * synchronize_hardirq(). So neither IRQTF_RUNTHREAD nor the
1148 : : * oneshot mask bit can be set.
1149 : : */
1150 : 0 : task_work_cancel(current, irq_thread_dtor);
1151 : 0 : return 0;
1152 : : }
1153 : :
1154 : : /**
1155 : : * irq_wake_thread - wake the irq thread for the action identified by dev_id
1156 : : * @irq: Interrupt line
1157 : : * @dev_id: Device identity for which the thread should be woken
1158 : : *
1159 : : */
1160 : 0 : void irq_wake_thread(unsigned int irq, void *dev_id)
1161 : : {
1162 : 0 : struct irq_desc *desc = irq_to_desc(irq);
1163 : 0 : struct irqaction *action;
1164 : 0 : unsigned long flags;
1165 : :
1166 [ # # # # : 0 : if (!desc || WARN_ON(irq_settings_is_per_cpu_devid(desc)))
# # ]
1167 : : return;
1168 : :
1169 : 0 : raw_spin_lock_irqsave(&desc->lock, flags);
1170 [ # # ]: 0 : for_each_action_of_desc(desc, action) {
1171 [ # # ]: 0 : if (action->dev_id == dev_id) {
1172 [ # # ]: 0 : if (action->thread)
1173 : 0 : __irq_wake_thread(desc, action);
1174 : : break;
1175 : : }
1176 : : }
1177 : 0 : raw_spin_unlock_irqrestore(&desc->lock, flags);
1178 : : }
1179 : : EXPORT_SYMBOL_GPL(irq_wake_thread);
1180 : :
1181 : 117 : static int irq_setup_forced_threading(struct irqaction *new)
1182 : : {
1183 [ - + ]: 117 : if (!force_irqthreads)
1184 : : return 0;
1185 [ # # ]: 0 : if (new->flags & (IRQF_NO_THREAD | IRQF_PERCPU | IRQF_ONESHOT))
1186 : : return 0;
1187 : :
1188 : : /*
1189 : : * No further action required for interrupts which are requested as
1190 : : * threaded interrupts already
1191 : : */
1192 [ # # ]: 0 : if (new->handler == irq_default_primary_handler)
1193 : : return 0;
1194 : :
1195 : 0 : new->flags |= IRQF_ONESHOT;
1196 : :
1197 : : /*
1198 : : * Handle the case where we have a real primary handler and a
1199 : : * thread handler. We force thread them as well by creating a
1200 : : * secondary action.
1201 : : */
1202 [ # # # # ]: 0 : if (new->handler && new->thread_fn) {
1203 : : /* Allocate the secondary action */
1204 : 0 : new->secondary = kzalloc(sizeof(struct irqaction), GFP_KERNEL);
1205 [ # # ]: 0 : if (!new->secondary)
1206 : : return -ENOMEM;
1207 : 0 : new->secondary->handler = irq_forced_secondary_handler;
1208 : 0 : new->secondary->thread_fn = new->thread_fn;
1209 : 0 : new->secondary->dev_id = new->dev_id;
1210 : 0 : new->secondary->irq = new->irq;
1211 : 0 : new->secondary->name = new->name;
1212 : : }
1213 : : /* Deal with the primary handler */
1214 : 0 : set_bit(IRQTF_FORCED_THREAD, &new->thread_flags);
1215 : 0 : new->thread_fn = new->handler;
1216 : 0 : new->handler = irq_default_primary_handler;
1217 : 0 : return 0;
1218 : : }
1219 : :
1220 : 117 : static int irq_request_resources(struct irq_desc *desc)
1221 : : {
1222 : 117 : struct irq_data *d = &desc->irq_data;
1223 : 117 : struct irq_chip *c = d->chip;
1224 : :
1225 : 0 : return c->irq_request_resources ? c->irq_request_resources(d) : 0;
1226 : : }
1227 : :
1228 : 13 : static void irq_release_resources(struct irq_desc *desc)
1229 : : {
1230 : 13 : struct irq_data *d = &desc->irq_data;
1231 : 13 : struct irq_chip *c = d->chip;
1232 : :
1233 : 13 : if (c->irq_release_resources)
1234 : 0 : c->irq_release_resources(d);
1235 : : }
1236 : :
1237 : 0 : static bool irq_supports_nmi(struct irq_desc *desc)
1238 : : {
1239 [ # # # # ]: 0 : struct irq_data *d = irq_desc_get_irq_data(desc);
1240 : :
1241 : : #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
1242 : : /* Only IRQs directly managed by the root irqchip can be set as NMI */
1243 [ # # # # ]: 0 : if (d->parent_data)
1244 : : return false;
1245 : : #endif
1246 : : /* Don't support NMIs for chips behind a slow bus */
1247 [ # # # # : 0 : if (d->chip->irq_bus_lock || d->chip->irq_bus_sync_unlock)
# # # # ]
1248 : : return false;
1249 : :
1250 : 0 : return d->chip->flags & IRQCHIP_SUPPORTS_NMI;
1251 : : }
1252 : :
1253 : 0 : static int irq_nmi_setup(struct irq_desc *desc)
1254 : : {
1255 : 0 : struct irq_data *d = irq_desc_get_irq_data(desc);
1256 : 0 : struct irq_chip *c = d->chip;
1257 : :
1258 [ # # # # ]: 0 : return c->irq_nmi_setup ? c->irq_nmi_setup(d) : -EINVAL;
1259 : : }
1260 : :
1261 : 0 : static void irq_nmi_teardown(struct irq_desc *desc)
1262 : : {
1263 : 0 : struct irq_data *d = irq_desc_get_irq_data(desc);
1264 : 0 : struct irq_chip *c = d->chip;
1265 : :
1266 [ # # # # ]: 0 : if (c->irq_nmi_teardown)
1267 : 0 : c->irq_nmi_teardown(d);
1268 : : }
1269 : :
1270 : : static int
1271 : 0 : setup_irq_thread(struct irqaction *new, unsigned int irq, bool secondary)
1272 : : {
1273 : 0 : struct task_struct *t;
1274 : 0 : struct sched_param param = {
1275 : : .sched_priority = MAX_USER_RT_PRIO/2,
1276 : : };
1277 : :
1278 [ # # ]: 0 : if (!secondary) {
1279 : 0 : t = kthread_create(irq_thread, new, "irq/%d-%s", irq,
1280 : : new->name);
1281 : : } else {
1282 : 0 : t = kthread_create(irq_thread, new, "irq/%d-s-%s", irq,
1283 : : new->name);
1284 : 0 : param.sched_priority -= 1;
1285 : : }
1286 : :
1287 [ # # ]: 0 : if (IS_ERR(t))
1288 : 0 : return PTR_ERR(t);
1289 : :
1290 : 0 : sched_setscheduler_nocheck(t, SCHED_FIFO, ¶m);
1291 : :
1292 : : /*
1293 : : * We keep the reference to the task struct even if
1294 : : * the thread dies to avoid that the interrupt code
1295 : : * references an already freed task_struct.
1296 : : */
1297 : 0 : new->thread = get_task_struct(t);
1298 : : /*
1299 : : * Tell the thread to set its affinity. This is
1300 : : * important for shared interrupt handlers as we do
1301 : : * not invoke setup_affinity() for the secondary
1302 : : * handlers as everything is already set up. Even for
1303 : : * interrupts marked with IRQF_NO_BALANCE this is
1304 : : * correct as we want the thread to move to the cpu(s)
1305 : : * on which the requesting code placed the interrupt.
1306 : : */
1307 : 0 : set_bit(IRQTF_AFFINITY, &new->thread_flags);
1308 : 0 : return 0;
1309 : : }
1310 : :
1311 : : /*
1312 : : * Internal function to register an irqaction - typically used to
1313 : : * allocate special interrupts that are part of the architecture.
1314 : : *
1315 : : * Locking rules:
1316 : : *
1317 : : * desc->request_mutex Provides serialization against a concurrent free_irq()
1318 : : * chip_bus_lock Provides serialization for slow bus operations
1319 : : * desc->lock Provides serialization against hard interrupts
1320 : : *
1321 : : * chip_bus_lock and desc->lock are sufficient for all other management and
1322 : : * interrupt related functions. desc->request_mutex solely serializes
1323 : : * request/free_irq().
1324 : : */
1325 : : static int
1326 : 117 : __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
1327 : : {
1328 : 117 : struct irqaction *old, **old_ptr;
1329 : 117 : unsigned long flags, thread_mask = 0;
1330 : 117 : int ret, nested, shared = 0;
1331 : :
1332 [ + - ]: 117 : if (!desc)
1333 : : return -EINVAL;
1334 : :
1335 [ + - ]: 117 : if (desc->irq_data.chip == &no_irq_chip)
1336 : : return -ENOSYS;
1337 [ + - ]: 117 : if (!try_module_get(desc->owner))
1338 : : return -ENODEV;
1339 : :
1340 : 117 : new->irq = irq;
1341 : :
1342 : : /*
1343 : : * If the trigger type is not specified by the caller,
1344 : : * then use the default for this interrupt.
1345 : : */
1346 [ + - ]: 117 : if (!(new->flags & IRQF_TRIGGER_MASK))
1347 : 117 : new->flags |= irqd_get_trigger_type(&desc->irq_data);
1348 : :
1349 : : /*
1350 : : * Check whether the interrupt nests into another interrupt
1351 : : * thread.
1352 : : */
1353 [ - + ]: 117 : nested = irq_settings_is_nested_thread(desc);
1354 [ - + ]: 117 : if (nested) {
1355 [ # # ]: 0 : if (!new->thread_fn) {
1356 : 0 : ret = -EINVAL;
1357 : 0 : goto out_mput;
1358 : : }
1359 : : /*
1360 : : * Replace the primary handler which was provided from
1361 : : * the driver for non nested interrupt handling by the
1362 : : * dummy function which warns when called.
1363 : : */
1364 : 0 : new->handler = irq_nested_primary_handler;
1365 : : } else {
1366 [ + - ]: 117 : if (irq_settings_can_thread(desc)) {
1367 : 117 : ret = irq_setup_forced_threading(new);
1368 [ - + ]: 117 : if (ret)
1369 : 0 : goto out_mput;
1370 : : }
1371 : : }
1372 : :
1373 : : /*
1374 : : * Create a handler thread when a thread function is supplied
1375 : : * and the interrupt does not nest into another interrupt
1376 : : * thread.
1377 : : */
1378 [ - + - - ]: 117 : if (new->thread_fn && !nested) {
1379 : 0 : ret = setup_irq_thread(new, irq, false);
1380 [ # # ]: 0 : if (ret)
1381 : 0 : goto out_mput;
1382 [ # # ]: 0 : if (new->secondary) {
1383 : 0 : ret = setup_irq_thread(new->secondary, irq, true);
1384 [ # # ]: 0 : if (ret)
1385 : 0 : goto out_thread;
1386 : : }
1387 : : }
1388 : :
1389 : : /*
1390 : : * Drivers are often written to work w/o knowledge about the
1391 : : * underlying irq chip implementation, so a request for a
1392 : : * threaded irq without a primary hard irq context handler
1393 : : * requires the ONESHOT flag to be set. Some irq chips like
1394 : : * MSI based interrupts are per se one shot safe. Check the
1395 : : * chip flags, so we can avoid the unmask dance at the end of
1396 : : * the threaded handler for those.
1397 : : */
1398 [ - + ]: 117 : if (desc->irq_data.chip->flags & IRQCHIP_ONESHOT_SAFE)
1399 : 0 : new->flags &= ~IRQF_ONESHOT;
1400 : :
1401 : : /*
1402 : : * Protects against a concurrent __free_irq() call which might wait
1403 : : * for synchronize_hardirq() to complete without holding the optional
1404 : : * chip bus lock and desc->lock. Also protects against handing out
1405 : : * a recycled oneshot thread_mask bit while it's still in use by
1406 : : * its previous owner.
1407 : : */
1408 : 117 : mutex_lock(&desc->request_mutex);
1409 : :
1410 : : /*
1411 : : * Acquire bus lock as the irq_request_resources() callback below
1412 : : * might rely on the serialization or the magic power management
1413 : : * functions which are abusing the irq_bus_lock() callback,
1414 : : */
1415 [ - + ]: 117 : chip_bus_lock(desc);
1416 : :
1417 : : /* First installed action requests resources. */
1418 [ + - ]: 117 : if (!desc->action) {
1419 [ - + ]: 117 : ret = irq_request_resources(desc);
1420 [ # # ]: 0 : if (ret) {
1421 : 0 : pr_err("Failed to request resources for %s (irq %d) on irqchip %s\n",
1422 : : new->name, irq, desc->irq_data.chip->name);
1423 : 0 : goto out_bus_unlock;
1424 : : }
1425 : : }
1426 : :
1427 : : /*
1428 : : * The following block of code has to be executed atomically
1429 : : * protected against a concurrent interrupt and any of the other
1430 : : * management calls which are not serialized via
1431 : : * desc->request_mutex or the optional bus lock.
1432 : : */
1433 : 117 : raw_spin_lock_irqsave(&desc->lock, flags);
1434 : 117 : old_ptr = &desc->action;
1435 : 117 : old = *old_ptr;
1436 [ - + ]: 117 : if (old) {
1437 : : /*
1438 : : * Can't share interrupts unless both agree to and are
1439 : : * the same type (level, edge, polarity). So both flag
1440 : : * fields must have IRQF_SHARED set and the bits which
1441 : : * set the trigger type must match. Also all must
1442 : : * agree on ONESHOT.
1443 : : * Interrupt lines used for NMIs cannot be shared.
1444 : : */
1445 : 0 : unsigned int oldtype;
1446 : :
1447 [ # # ]: 0 : if (desc->istate & IRQS_NMI) {
1448 : 0 : pr_err("Invalid attempt to share NMI for %s (irq %d) on irqchip %s.\n",
1449 : : new->name, irq, desc->irq_data.chip->name);
1450 : 0 : ret = -EINVAL;
1451 : 0 : goto out_unlock;
1452 : : }
1453 : :
1454 : : /*
1455 : : * If nobody did set the configuration before, inherit
1456 : : * the one provided by the requester.
1457 : : */
1458 [ # # ]: 0 : if (irqd_trigger_type_was_set(&desc->irq_data)) {
1459 : 0 : oldtype = irqd_get_trigger_type(&desc->irq_data);
1460 : : } else {
1461 : 0 : oldtype = new->flags & IRQF_TRIGGER_MASK;
1462 : 0 : irqd_set_trigger_type(&desc->irq_data, oldtype);
1463 : : }
1464 : :
1465 [ # # ]: 0 : if (!((old->flags & new->flags) & IRQF_SHARED) ||
1466 [ # # ]: 0 : (oldtype != (new->flags & IRQF_TRIGGER_MASK)) ||
1467 [ # # ]: 0 : ((old->flags ^ new->flags) & IRQF_ONESHOT))
1468 : 0 : goto mismatch;
1469 : :
1470 : : /* All handlers must agree on per-cpuness */
1471 [ # # ]: 0 : if ((old->flags & IRQF_PERCPU) !=
1472 : : (new->flags & IRQF_PERCPU))
1473 : 0 : goto mismatch;
1474 : :
1475 : : /* add new interrupt at end of irq queue */
1476 : 0 : do {
1477 : : /*
1478 : : * Or all existing action->thread_mask bits,
1479 : : * so we can find the next zero bit for this
1480 : : * new action.
1481 : : */
1482 : 0 : thread_mask |= old->thread_mask;
1483 : 0 : old_ptr = &old->next;
1484 : 0 : old = *old_ptr;
1485 [ # # ]: 0 : } while (old);
1486 : : shared = 1;
1487 : : }
1488 : :
1489 : : /*
1490 : : * Setup the thread mask for this irqaction for ONESHOT. For
1491 : : * !ONESHOT irqs the thread mask is 0 so we can avoid a
1492 : : * conditional in irq_wake_thread().
1493 : : */
1494 [ - + ]: 117 : if (new->flags & IRQF_ONESHOT) {
1495 : : /*
1496 : : * Unlikely to have 32 resp 64 irqs sharing one line,
1497 : : * but who knows.
1498 : : */
1499 [ # # ]: 0 : if (thread_mask == ~0UL) {
1500 : 0 : ret = -EBUSY;
1501 : 0 : goto out_unlock;
1502 : : }
1503 : : /*
1504 : : * The thread_mask for the action is or'ed to
1505 : : * desc->thread_active to indicate that the
1506 : : * IRQF_ONESHOT thread handler has been woken, but not
1507 : : * yet finished. The bit is cleared when a thread
1508 : : * completes. When all threads of a shared interrupt
1509 : : * line have completed desc->threads_active becomes
1510 : : * zero and the interrupt line is unmasked. See
1511 : : * handle.c:irq_wake_thread() for further information.
1512 : : *
1513 : : * If no thread is woken by primary (hard irq context)
1514 : : * interrupt handlers, then desc->threads_active is
1515 : : * also checked for zero to unmask the irq line in the
1516 : : * affected hard irq flow handlers
1517 : : * (handle_[fasteoi|level]_irq).
1518 : : *
1519 : : * The new action gets the first zero bit of
1520 : : * thread_mask assigned. See the loop above which or's
1521 : : * all existing action->thread_mask bits.
1522 : : */
1523 : 0 : new->thread_mask = 1UL << ffz(thread_mask);
1524 : :
1525 [ - + ]: 117 : } else if (new->handler == irq_default_primary_handler &&
1526 [ # # ]: 0 : !(desc->irq_data.chip->flags & IRQCHIP_ONESHOT_SAFE)) {
1527 : : /*
1528 : : * The interrupt was requested with handler = NULL, so
1529 : : * we use the default primary handler for it. But it
1530 : : * does not have the oneshot flag set. In combination
1531 : : * with level interrupts this is deadly, because the
1532 : : * default primary handler just wakes the thread, then
1533 : : * the irq lines is reenabled, but the device still
1534 : : * has the level irq asserted. Rinse and repeat....
1535 : : *
1536 : : * While this works for edge type interrupts, we play
1537 : : * it safe and reject unconditionally because we can't
1538 : : * say for sure which type this interrupt really
1539 : : * has. The type flags are unreliable as the
1540 : : * underlying chip implementation can override them.
1541 : : */
1542 : 0 : pr_err("Threaded irq requested with handler=NULL and !ONESHOT for %s (irq %d)\n",
1543 : : new->name, irq);
1544 : 0 : ret = -EINVAL;
1545 : 0 : goto out_unlock;
1546 : : }
1547 : :
1548 [ + - ]: 117 : if (!shared) {
1549 : 117 : init_waitqueue_head(&desc->wait_for_threads);
1550 : :
1551 : : /* Setup the type (level, edge polarity) if configured: */
1552 [ - + ]: 117 : if (new->flags & IRQF_TRIGGER_MASK) {
1553 : 0 : ret = __irq_set_trigger(desc,
1554 : : new->flags & IRQF_TRIGGER_MASK);
1555 : :
1556 [ # # ]: 0 : if (ret)
1557 : 0 : goto out_unlock;
1558 : : }
1559 : :
1560 : : /*
1561 : : * Activate the interrupt. That activation must happen
1562 : : * independently of IRQ_NOAUTOEN. request_irq() can fail
1563 : : * and the callers are supposed to handle
1564 : : * that. enable_irq() of an interrupt requested with
1565 : : * IRQ_NOAUTOEN is not supposed to fail. The activation
1566 : : * keeps it in shutdown mode, it merily associates
1567 : : * resources if necessary and if that's not possible it
1568 : : * fails. Interrupts which are in managed shutdown mode
1569 : : * will simply ignore that activation request.
1570 : : */
1571 : 117 : ret = irq_activate(desc);
1572 [ - + ]: 117 : if (ret)
1573 : 0 : goto out_unlock;
1574 : :
1575 : 117 : desc->istate &= ~(IRQS_AUTODETECT | IRQS_SPURIOUS_DISABLED | \
1576 : : IRQS_ONESHOT | IRQS_WAITING);
1577 [ - + ]: 117 : irqd_clear(&desc->irq_data, IRQD_IRQ_INPROGRESS);
1578 : :
1579 [ - + ]: 117 : if (new->flags & IRQF_PERCPU) {
1580 : 0 : irqd_set(&desc->irq_data, IRQD_PER_CPU);
1581 : 0 : irq_settings_set_per_cpu(desc);
1582 : : }
1583 : :
1584 [ - + ]: 117 : if (new->flags & IRQF_ONESHOT)
1585 : 0 : desc->istate |= IRQS_ONESHOT;
1586 : :
1587 : : /* Exclude IRQ from balancing if requested */
1588 [ + + ]: 117 : if (new->flags & IRQF_NOBALANCING) {
1589 : 13 : irq_settings_set_no_balancing(desc);
1590 : 13 : irqd_set(&desc->irq_data, IRQD_NO_BALANCING);
1591 : : }
1592 : :
1593 [ + - ]: 117 : if (irq_settings_can_autoenable(desc)) {
1594 : 117 : irq_startup(desc, IRQ_RESEND, IRQ_START_COND);
1595 : : } else {
1596 : : /*
1597 : : * Shared interrupts do not go well with disabling
1598 : : * auto enable. The sharing interrupt might request
1599 : : * it while it's still disabled and then wait for
1600 : : * interrupts forever.
1601 : : */
1602 [ # # ]: 0 : WARN_ON_ONCE(new->flags & IRQF_SHARED);
1603 : : /* Undo nested disables: */
1604 : 0 : desc->depth = 1;
1605 : : }
1606 : :
1607 [ # # ]: 0 : } else if (new->flags & IRQF_TRIGGER_MASK) {
1608 : 0 : unsigned int nmsk = new->flags & IRQF_TRIGGER_MASK;
1609 [ # # ]: 0 : unsigned int omsk = irqd_get_trigger_type(&desc->irq_data);
1610 : :
1611 [ # # ]: 0 : if (nmsk != omsk)
1612 : : /* hope the handler works with current trigger mode */
1613 : 0 : pr_warn("irq %d uses trigger mode %u; requested %u\n",
1614 : : irq, omsk, nmsk);
1615 : : }
1616 : :
1617 : 117 : *old_ptr = new;
1618 : :
1619 : 117 : irq_pm_install_action(desc, new);
1620 : :
1621 : : /* Reset broken irq detection when installing new handler */
1622 : 117 : desc->irq_count = 0;
1623 : 117 : desc->irqs_unhandled = 0;
1624 : :
1625 : : /*
1626 : : * Check whether we disabled the irq via the spurious handler
1627 : : * before. Reenable it and give it another chance.
1628 : : */
1629 [ - + - - ]: 117 : if (shared && (desc->istate & IRQS_SPURIOUS_DISABLED)) {
1630 : 0 : desc->istate &= ~IRQS_SPURIOUS_DISABLED;
1631 : 0 : __enable_irq(desc);
1632 : : }
1633 : :
1634 : 117 : raw_spin_unlock_irqrestore(&desc->lock, flags);
1635 [ - + ]: 117 : chip_bus_sync_unlock(desc);
1636 : 117 : mutex_unlock(&desc->request_mutex);
1637 : :
1638 [ - + ]: 117 : irq_setup_timings(desc, new);
1639 : :
1640 : : /*
1641 : : * Strictly no need to wake it up, but hung_task complains
1642 : : * when no hard interrupt wakes the thread up.
1643 : : */
1644 [ - + ]: 117 : if (new->thread)
1645 : 0 : wake_up_process(new->thread);
1646 [ - + ]: 117 : if (new->secondary)
1647 : 0 : wake_up_process(new->secondary->thread);
1648 : :
1649 : 117 : register_irq_proc(irq, desc);
1650 : 117 : new->dir = NULL;
1651 : 117 : register_handler_proc(irq, new);
1652 : 117 : return 0;
1653 : :
1654 : 0 : mismatch:
1655 [ # # ]: 0 : if (!(new->flags & IRQF_PROBE_SHARED)) {
1656 : 0 : pr_err("Flags mismatch irq %d. %08x (%s) vs. %08x (%s)\n",
1657 : : irq, new->flags, new->name, old->flags, old->name);
1658 : : #ifdef CONFIG_DEBUG_SHIRQ
1659 : : dump_stack();
1660 : : #endif
1661 : : }
1662 : : ret = -EBUSY;
1663 : :
1664 : 0 : out_unlock:
1665 : 0 : raw_spin_unlock_irqrestore(&desc->lock, flags);
1666 : :
1667 [ # # ]: 0 : if (!desc->action)
1668 [ # # ]: 0 : irq_release_resources(desc);
1669 : 0 : out_bus_unlock:
1670 [ # # ]: 0 : chip_bus_sync_unlock(desc);
1671 : 0 : mutex_unlock(&desc->request_mutex);
1672 : :
1673 : 0 : out_thread:
1674 [ # # ]: 0 : if (new->thread) {
1675 : 0 : struct task_struct *t = new->thread;
1676 : :
1677 : 0 : new->thread = NULL;
1678 : 0 : kthread_stop(t);
1679 : 0 : put_task_struct(t);
1680 : : }
1681 [ # # # # ]: 0 : if (new->secondary && new->secondary->thread) {
1682 : 0 : struct task_struct *t = new->secondary->thread;
1683 : :
1684 : 0 : new->secondary->thread = NULL;
1685 : 0 : kthread_stop(t);
1686 : 0 : put_task_struct(t);
1687 : : }
1688 : 0 : out_mput:
1689 : 0 : module_put(desc->owner);
1690 : 0 : return ret;
1691 : : }
1692 : :
1693 : : /**
1694 : : * setup_irq - setup an interrupt
1695 : : * @irq: Interrupt line to setup
1696 : : * @act: irqaction for the interrupt
1697 : : *
1698 : : * Used to statically setup interrupts in the early boot process.
1699 : : */
1700 : 13 : int setup_irq(unsigned int irq, struct irqaction *act)
1701 : : {
1702 : 13 : int retval;
1703 : 13 : struct irq_desc *desc = irq_to_desc(irq);
1704 : :
1705 [ + - - + : 13 : if (!desc || WARN_ON(irq_settings_is_per_cpu_devid(desc)))
+ - ]
1706 : : return -EINVAL;
1707 : :
1708 : 13 : retval = irq_chip_pm_get(&desc->irq_data);
1709 [ + - ]: 13 : if (retval < 0)
1710 : : return retval;
1711 : :
1712 : 13 : retval = __setup_irq(irq, desc, act);
1713 : :
1714 [ - + ]: 13 : if (retval)
1715 : 0 : irq_chip_pm_put(&desc->irq_data);
1716 : :
1717 : : return retval;
1718 : : }
1719 : : EXPORT_SYMBOL_GPL(setup_irq);
1720 : :
1721 : : /*
1722 : : * Internal function to unregister an irqaction - used to free
1723 : : * regular and special interrupts that are part of the architecture.
1724 : : */
1725 : 13 : static struct irqaction *__free_irq(struct irq_desc *desc, void *dev_id)
1726 : : {
1727 : 13 : unsigned irq = desc->irq_data.irq;
1728 : 13 : struct irqaction *action, **action_ptr;
1729 : 13 : unsigned long flags;
1730 : :
1731 [ - + ]: 13 : WARN(in_interrupt(), "Trying to free IRQ %d from IRQ context!\n", irq);
1732 : :
1733 : 13 : mutex_lock(&desc->request_mutex);
1734 [ - + ]: 13 : chip_bus_lock(desc);
1735 : 13 : raw_spin_lock_irqsave(&desc->lock, flags);
1736 : :
1737 : : /*
1738 : : * There can be multiple actions per IRQ descriptor, find the right
1739 : : * one based on the dev_id:
1740 : : */
1741 : 13 : action_ptr = &desc->action;
1742 : 13 : for (;;) {
1743 : 13 : action = *action_ptr;
1744 : :
1745 [ - + ]: 13 : if (!action) {
1746 : 0 : WARN(1, "Trying to free already-free IRQ %d\n", irq);
1747 : 0 : raw_spin_unlock_irqrestore(&desc->lock, flags);
1748 [ # # ]: 0 : chip_bus_sync_unlock(desc);
1749 : 0 : mutex_unlock(&desc->request_mutex);
1750 : 0 : return NULL;
1751 : : }
1752 : :
1753 [ - + ]: 13 : if (action->dev_id == dev_id)
1754 : : break;
1755 : 0 : action_ptr = &action->next;
1756 : : }
1757 : :
1758 : : /* Found it - now remove it from the list of entries: */
1759 : 13 : *action_ptr = action->next;
1760 : :
1761 : 13 : irq_pm_remove_action(desc, action);
1762 : :
1763 : : /* If this was the last handler, shut down the IRQ line: */
1764 [ + - ]: 13 : if (!desc->action) {
1765 : 13 : irq_settings_clr_disable_unlazy(desc);
1766 : : /* Only shutdown. Deactivate after synchronize_hardirq() */
1767 : 13 : irq_shutdown(desc);
1768 : : }
1769 : :
1770 : : #ifdef CONFIG_SMP
1771 : : /* make sure affinity_hint is cleaned up */
1772 [ - + - + ]: 13 : if (WARN_ON_ONCE(desc->affinity_hint))
1773 : 0 : desc->affinity_hint = NULL;
1774 : : #endif
1775 : :
1776 : 13 : raw_spin_unlock_irqrestore(&desc->lock, flags);
1777 : : /*
1778 : : * Drop bus_lock here so the changes which were done in the chip
1779 : : * callbacks above are synced out to the irq chips which hang
1780 : : * behind a slow bus (I2C, SPI) before calling synchronize_hardirq().
1781 : : *
1782 : : * Aside of that the bus_lock can also be taken from the threaded
1783 : : * handler in irq_finalize_oneshot() which results in a deadlock
1784 : : * because kthread_stop() would wait forever for the thread to
1785 : : * complete, which is blocked on the bus lock.
1786 : : *
1787 : : * The still held desc->request_mutex() protects against a
1788 : : * concurrent request_irq() of this irq so the release of resources
1789 : : * and timing data is properly serialized.
1790 : : */
1791 [ - + ]: 13 : chip_bus_sync_unlock(desc);
1792 : :
1793 : 13 : unregister_handler_proc(irq, action);
1794 : :
1795 : : /*
1796 : : * Make sure it's not being used on another CPU and if the chip
1797 : : * supports it also make sure that there is no (not yet serviced)
1798 : : * interrupt in flight at the hardware level.
1799 : : */
1800 : 13 : __synchronize_hardirq(desc, true);
1801 : :
1802 : : #ifdef CONFIG_DEBUG_SHIRQ
1803 : : /*
1804 : : * It's a shared IRQ -- the driver ought to be prepared for an IRQ
1805 : : * event to happen even now it's being freed, so let's make sure that
1806 : : * is so by doing an extra call to the handler ....
1807 : : *
1808 : : * ( We do this after actually deregistering it, to make sure that a
1809 : : * 'real' IRQ doesn't run in parallel with our fake. )
1810 : : */
1811 : : if (action->flags & IRQF_SHARED) {
1812 : : local_irq_save(flags);
1813 : : action->handler(irq, dev_id);
1814 : : local_irq_restore(flags);
1815 : : }
1816 : : #endif
1817 : :
1818 : : /*
1819 : : * The action has already been removed above, but the thread writes
1820 : : * its oneshot mask bit when it completes. Though request_mutex is
1821 : : * held across this which prevents __setup_irq() from handing out
1822 : : * the same bit to a newly requested action.
1823 : : */
1824 [ - + ]: 13 : if (action->thread) {
1825 : 0 : kthread_stop(action->thread);
1826 : 0 : put_task_struct(action->thread);
1827 [ # # # # ]: 0 : if (action->secondary && action->secondary->thread) {
1828 : 0 : kthread_stop(action->secondary->thread);
1829 : 0 : put_task_struct(action->secondary->thread);
1830 : : }
1831 : : }
1832 : :
1833 : : /* Last action releases resources */
1834 [ + - ]: 13 : if (!desc->action) {
1835 : : /*
1836 : : * Reaquire bus lock as irq_release_resources() might
1837 : : * require it to deallocate resources over the slow bus.
1838 : : */
1839 [ - + ]: 13 : chip_bus_lock(desc);
1840 : : /*
1841 : : * There is no interrupt on the fly anymore. Deactivate it
1842 : : * completely.
1843 : : */
1844 : 13 : raw_spin_lock_irqsave(&desc->lock, flags);
1845 : 13 : irq_domain_deactivate_irq(&desc->irq_data);
1846 : 13 : raw_spin_unlock_irqrestore(&desc->lock, flags);
1847 : :
1848 [ - + ]: 13 : irq_release_resources(desc);
1849 [ - + ]: 13 : chip_bus_sync_unlock(desc);
1850 : : irq_remove_timings(desc);
1851 : : }
1852 : :
1853 : 13 : mutex_unlock(&desc->request_mutex);
1854 : :
1855 : 13 : irq_chip_pm_put(&desc->irq_data);
1856 : 13 : module_put(desc->owner);
1857 : 13 : kfree(action->secondary);
1858 : 13 : return action;
1859 : : }
1860 : :
1861 : : /**
1862 : : * remove_irq - free an interrupt
1863 : : * @irq: Interrupt line to free
1864 : : * @act: irqaction for the interrupt
1865 : : *
1866 : : * Used to remove interrupts statically setup by the early boot process.
1867 : : */
1868 : 0 : void remove_irq(unsigned int irq, struct irqaction *act)
1869 : : {
1870 : 0 : struct irq_desc *desc = irq_to_desc(irq);
1871 : :
1872 [ # # # # : 0 : if (desc && !WARN_ON(irq_settings_is_per_cpu_devid(desc)))
# # ]
1873 : 0 : __free_irq(desc, act->dev_id);
1874 : 0 : }
1875 : : EXPORT_SYMBOL_GPL(remove_irq);
1876 : :
1877 : : /**
1878 : : * free_irq - free an interrupt allocated with request_irq
1879 : : * @irq: Interrupt line to free
1880 : : * @dev_id: Device identity to free
1881 : : *
1882 : : * Remove an interrupt handler. The handler is removed and if the
1883 : : * interrupt line is no longer in use by any driver it is disabled.
1884 : : * On a shared IRQ the caller must ensure the interrupt is disabled
1885 : : * on the card it drives before calling this function. The function
1886 : : * does not return until any executing interrupts for this IRQ
1887 : : * have completed.
1888 : : *
1889 : : * This function must not be called from interrupt context.
1890 : : *
1891 : : * Returns the devname argument passed to request_irq.
1892 : : */
1893 : 13 : const void *free_irq(unsigned int irq, void *dev_id)
1894 : : {
1895 : 13 : struct irq_desc *desc = irq_to_desc(irq);
1896 : 13 : struct irqaction *action;
1897 : 13 : const char *devname;
1898 : :
1899 [ + - - + : 13 : if (!desc || WARN_ON(irq_settings_is_per_cpu_devid(desc)))
+ - ]
1900 : : return NULL;
1901 : :
1902 : : #ifdef CONFIG_SMP
1903 [ - + - + ]: 13 : if (WARN_ON(desc->affinity_notify))
1904 : 0 : desc->affinity_notify = NULL;
1905 : : #endif
1906 : :
1907 : 13 : action = __free_irq(desc, dev_id);
1908 : :
1909 [ + - ]: 13 : if (!action)
1910 : : return NULL;
1911 : :
1912 : 13 : devname = action->name;
1913 : 13 : kfree(action);
1914 : 13 : return devname;
1915 : : }
1916 : : EXPORT_SYMBOL(free_irq);
1917 : :
1918 : : /* This function must be called with desc->lock held */
1919 : 0 : static const void *__cleanup_nmi(unsigned int irq, struct irq_desc *desc)
1920 : : {
1921 : 0 : const char *devname = NULL;
1922 : :
1923 : 0 : desc->istate &= ~IRQS_NMI;
1924 : :
1925 [ # # # # ]: 0 : if (!WARN_ON(desc->action == NULL)) {
1926 : 0 : irq_pm_remove_action(desc, desc->action);
1927 : 0 : devname = desc->action->name;
1928 : 0 : unregister_handler_proc(irq, desc->action);
1929 : :
1930 : 0 : kfree(desc->action);
1931 : 0 : desc->action = NULL;
1932 : : }
1933 : :
1934 : 0 : irq_settings_clr_disable_unlazy(desc);
1935 : 0 : irq_shutdown_and_deactivate(desc);
1936 : :
1937 [ # # ]: 0 : irq_release_resources(desc);
1938 : :
1939 : 0 : irq_chip_pm_put(&desc->irq_data);
1940 : 0 : module_put(desc->owner);
1941 : :
1942 : 0 : return devname;
1943 : : }
1944 : :
1945 : 0 : const void *free_nmi(unsigned int irq, void *dev_id)
1946 : : {
1947 : 0 : struct irq_desc *desc = irq_to_desc(irq);
1948 : 0 : unsigned long flags;
1949 : 0 : const void *devname;
1950 : :
1951 [ # # # # : 0 : if (!desc || WARN_ON(!(desc->istate & IRQS_NMI)))
# # ]
1952 : : return NULL;
1953 : :
1954 [ # # # # ]: 0 : if (WARN_ON(irq_settings_is_per_cpu_devid(desc)))
1955 : : return NULL;
1956 : :
1957 : : /* NMI still enabled */
1958 [ # # # # ]: 0 : if (WARN_ON(desc->depth == 0))
1959 : 0 : disable_nmi_nosync(irq);
1960 : :
1961 : 0 : raw_spin_lock_irqsave(&desc->lock, flags);
1962 : :
1963 [ # # ]: 0 : irq_nmi_teardown(desc);
1964 : 0 : devname = __cleanup_nmi(irq, desc);
1965 : :
1966 : 0 : raw_spin_unlock_irqrestore(&desc->lock, flags);
1967 : :
1968 : 0 : return devname;
1969 : : }
1970 : :
1971 : : /**
1972 : : * request_threaded_irq - allocate an interrupt line
1973 : : * @irq: Interrupt line to allocate
1974 : : * @handler: Function to be called when the IRQ occurs.
1975 : : * Primary handler for threaded interrupts
1976 : : * If NULL and thread_fn != NULL the default
1977 : : * primary handler is installed
1978 : : * @thread_fn: Function called from the irq handler thread
1979 : : * If NULL, no irq thread is created
1980 : : * @irqflags: Interrupt type flags
1981 : : * @devname: An ascii name for the claiming device
1982 : : * @dev_id: A cookie passed back to the handler function
1983 : : *
1984 : : * This call allocates interrupt resources and enables the
1985 : : * interrupt line and IRQ handling. From the point this
1986 : : * call is made your handler function may be invoked. Since
1987 : : * your handler function must clear any interrupt the board
1988 : : * raises, you must take care both to initialise your hardware
1989 : : * and to set up the interrupt handler in the right order.
1990 : : *
1991 : : * If you want to set up a threaded irq handler for your device
1992 : : * then you need to supply @handler and @thread_fn. @handler is
1993 : : * still called in hard interrupt context and has to check
1994 : : * whether the interrupt originates from the device. If yes it
1995 : : * needs to disable the interrupt on the device and return
1996 : : * IRQ_WAKE_THREAD which will wake up the handler thread and run
1997 : : * @thread_fn. This split handler design is necessary to support
1998 : : * shared interrupts.
1999 : : *
2000 : : * Dev_id must be globally unique. Normally the address of the
2001 : : * device data structure is used as the cookie. Since the handler
2002 : : * receives this value it makes sense to use it.
2003 : : *
2004 : : * If your interrupt is shared you must pass a non NULL dev_id
2005 : : * as this is required when freeing the interrupt.
2006 : : *
2007 : : * Flags:
2008 : : *
2009 : : * IRQF_SHARED Interrupt is shared
2010 : : * IRQF_TRIGGER_* Specify active edge(s) or level
2011 : : *
2012 : : */
2013 : 104 : int request_threaded_irq(unsigned int irq, irq_handler_t handler,
2014 : : irq_handler_t thread_fn, unsigned long irqflags,
2015 : : const char *devname, void *dev_id)
2016 : : {
2017 : 104 : struct irqaction *action;
2018 : 104 : struct irq_desc *desc;
2019 : 104 : int retval;
2020 : :
2021 [ + - ]: 104 : if (irq == IRQ_NOTCONNECTED)
2022 : : return -ENOTCONN;
2023 : :
2024 : : /*
2025 : : * Sanity-check: shared interrupts must pass in a real dev-ID,
2026 : : * otherwise we'll have trouble later trying to figure out
2027 : : * which interrupt is which (messes up the interrupt freeing
2028 : : * logic etc).
2029 : : *
2030 : : * Also IRQF_COND_SUSPEND only makes sense for shared interrupts and
2031 : : * it cannot be set along with IRQF_NO_SUSPEND.
2032 : : */
2033 [ + + + - ]: 104 : if (((irqflags & IRQF_SHARED) && !dev_id) ||
2034 [ + - ]: 104 : (!(irqflags & IRQF_SHARED) && (irqflags & IRQF_COND_SUSPEND)) ||
2035 [ + - ]: 104 : ((irqflags & IRQF_NO_SUSPEND) && (irqflags & IRQF_COND_SUSPEND)))
2036 : : return -EINVAL;
2037 : :
2038 : 104 : desc = irq_to_desc(irq);
2039 [ + - ]: 104 : if (!desc)
2040 : : return -EINVAL;
2041 : :
2042 [ + - ]: 104 : if (!irq_settings_can_request(desc) ||
2043 [ - + + - ]: 104 : WARN_ON(irq_settings_is_per_cpu_devid(desc)))
2044 : : return -EINVAL;
2045 : :
2046 [ - + ]: 104 : if (!handler) {
2047 [ # # ]: 0 : if (!thread_fn)
2048 : : return -EINVAL;
2049 : : handler = irq_default_primary_handler;
2050 : : }
2051 : :
2052 : 104 : action = kzalloc(sizeof(struct irqaction), GFP_KERNEL);
2053 [ + - ]: 104 : if (!action)
2054 : : return -ENOMEM;
2055 : :
2056 : 104 : action->handler = handler;
2057 : 104 : action->thread_fn = thread_fn;
2058 : 104 : action->flags = irqflags;
2059 : 104 : action->name = devname;
2060 : 104 : action->dev_id = dev_id;
2061 : :
2062 : 104 : retval = irq_chip_pm_get(&desc->irq_data);
2063 [ - + ]: 104 : if (retval < 0) {
2064 : 0 : kfree(action);
2065 : 0 : return retval;
2066 : : }
2067 : :
2068 : 104 : retval = __setup_irq(irq, desc, action);
2069 : :
2070 [ - + ]: 104 : if (retval) {
2071 : 0 : irq_chip_pm_put(&desc->irq_data);
2072 : 0 : kfree(action->secondary);
2073 : 0 : kfree(action);
2074 : : }
2075 : :
2076 : : #ifdef CONFIG_DEBUG_SHIRQ_FIXME
2077 : : if (!retval && (irqflags & IRQF_SHARED)) {
2078 : : /*
2079 : : * It's a shared IRQ -- the driver ought to be prepared for it
2080 : : * to happen immediately, so let's make sure....
2081 : : * We disable the irq to make sure that a 'real' IRQ doesn't
2082 : : * run in parallel with our fake.
2083 : : */
2084 : : unsigned long flags;
2085 : :
2086 : : disable_irq(irq);
2087 : : local_irq_save(flags);
2088 : :
2089 : : handler(irq, dev_id);
2090 : :
2091 : : local_irq_restore(flags);
2092 : : enable_irq(irq);
2093 : : }
2094 : : #endif
2095 : : return retval;
2096 : : }
2097 : : EXPORT_SYMBOL(request_threaded_irq);
2098 : :
2099 : : /**
2100 : : * request_any_context_irq - allocate an interrupt line
2101 : : * @irq: Interrupt line to allocate
2102 : : * @handler: Function to be called when the IRQ occurs.
2103 : : * Threaded handler for threaded interrupts.
2104 : : * @flags: Interrupt type flags
2105 : : * @name: An ascii name for the claiming device
2106 : : * @dev_id: A cookie passed back to the handler function
2107 : : *
2108 : : * This call allocates interrupt resources and enables the
2109 : : * interrupt line and IRQ handling. It selects either a
2110 : : * hardirq or threaded handling method depending on the
2111 : : * context.
2112 : : *
2113 : : * On failure, it returns a negative value. On success,
2114 : : * it returns either IRQC_IS_HARDIRQ or IRQC_IS_NESTED.
2115 : : */
2116 : 0 : int request_any_context_irq(unsigned int irq, irq_handler_t handler,
2117 : : unsigned long flags, const char *name, void *dev_id)
2118 : : {
2119 : 0 : struct irq_desc *desc;
2120 : 0 : int ret;
2121 : :
2122 [ # # ]: 0 : if (irq == IRQ_NOTCONNECTED)
2123 : : return -ENOTCONN;
2124 : :
2125 : 0 : desc = irq_to_desc(irq);
2126 [ # # ]: 0 : if (!desc)
2127 : : return -EINVAL;
2128 : :
2129 [ # # ]: 0 : if (irq_settings_is_nested_thread(desc)) {
2130 : 0 : ret = request_threaded_irq(irq, NULL, handler,
2131 : : flags, name, dev_id);
2132 [ # # ]: 0 : return !ret ? IRQC_IS_NESTED : ret;
2133 : : }
2134 : :
2135 : 0 : ret = request_irq(irq, handler, flags, name, dev_id);
2136 : 0 : return !ret ? IRQC_IS_HARDIRQ : ret;
2137 : : }
2138 : : EXPORT_SYMBOL_GPL(request_any_context_irq);
2139 : :
2140 : : /**
2141 : : * request_nmi - allocate an interrupt line for NMI delivery
2142 : : * @irq: Interrupt line to allocate
2143 : : * @handler: Function to be called when the IRQ occurs.
2144 : : * Threaded handler for threaded interrupts.
2145 : : * @irqflags: Interrupt type flags
2146 : : * @name: An ascii name for the claiming device
2147 : : * @dev_id: A cookie passed back to the handler function
2148 : : *
2149 : : * This call allocates interrupt resources and enables the
2150 : : * interrupt line and IRQ handling. It sets up the IRQ line
2151 : : * to be handled as an NMI.
2152 : : *
2153 : : * An interrupt line delivering NMIs cannot be shared and IRQ handling
2154 : : * cannot be threaded.
2155 : : *
2156 : : * Interrupt lines requested for NMI delivering must produce per cpu
2157 : : * interrupts and have auto enabling setting disabled.
2158 : : *
2159 : : * Dev_id must be globally unique. Normally the address of the
2160 : : * device data structure is used as the cookie. Since the handler
2161 : : * receives this value it makes sense to use it.
2162 : : *
2163 : : * If the interrupt line cannot be used to deliver NMIs, function
2164 : : * will fail and return a negative value.
2165 : : */
2166 : 0 : int request_nmi(unsigned int irq, irq_handler_t handler,
2167 : : unsigned long irqflags, const char *name, void *dev_id)
2168 : : {
2169 : 0 : struct irqaction *action;
2170 : 0 : struct irq_desc *desc;
2171 : 0 : unsigned long flags;
2172 : 0 : int retval;
2173 : :
2174 [ # # ]: 0 : if (irq == IRQ_NOTCONNECTED)
2175 : : return -ENOTCONN;
2176 : :
2177 : : /* NMI cannot be shared, used for Polling */
2178 [ # # ]: 0 : if (irqflags & (IRQF_SHARED | IRQF_COND_SUSPEND | IRQF_IRQPOLL))
2179 : : return -EINVAL;
2180 : :
2181 [ # # ]: 0 : if (!(irqflags & IRQF_PERCPU))
2182 : : return -EINVAL;
2183 : :
2184 [ # # ]: 0 : if (!handler)
2185 : : return -EINVAL;
2186 : :
2187 : 0 : desc = irq_to_desc(irq);
2188 : :
2189 [ # # # # : 0 : if (!desc || irq_settings_can_autoenable(desc) ||
# # ]
2190 : 0 : !irq_settings_can_request(desc) ||
2191 [ # # # # : 0 : WARN_ON(irq_settings_is_per_cpu_devid(desc)) ||
# # ]
2192 : : !irq_supports_nmi(desc))
2193 : : return -EINVAL;
2194 : :
2195 : 0 : action = kzalloc(sizeof(struct irqaction), GFP_KERNEL);
2196 [ # # ]: 0 : if (!action)
2197 : : return -ENOMEM;
2198 : :
2199 : 0 : action->handler = handler;
2200 : 0 : action->flags = irqflags | IRQF_NO_THREAD | IRQF_NOBALANCING;
2201 : 0 : action->name = name;
2202 : 0 : action->dev_id = dev_id;
2203 : :
2204 : 0 : retval = irq_chip_pm_get(&desc->irq_data);
2205 [ # # ]: 0 : if (retval < 0)
2206 : 0 : goto err_out;
2207 : :
2208 : 0 : retval = __setup_irq(irq, desc, action);
2209 [ # # ]: 0 : if (retval)
2210 : 0 : goto err_irq_setup;
2211 : :
2212 : 0 : raw_spin_lock_irqsave(&desc->lock, flags);
2213 : :
2214 : : /* Setup NMI state */
2215 : 0 : desc->istate |= IRQS_NMI;
2216 [ # # ]: 0 : retval = irq_nmi_setup(desc);
2217 [ # # ]: 0 : if (retval) {
2218 : 0 : __cleanup_nmi(irq, desc);
2219 : 0 : raw_spin_unlock_irqrestore(&desc->lock, flags);
2220 : 0 : return -EINVAL;
2221 : : }
2222 : :
2223 : 0 : raw_spin_unlock_irqrestore(&desc->lock, flags);
2224 : :
2225 : 0 : return 0;
2226 : :
2227 : : err_irq_setup:
2228 : 0 : irq_chip_pm_put(&desc->irq_data);
2229 : 0 : err_out:
2230 : 0 : kfree(action);
2231 : :
2232 : 0 : return retval;
2233 : : }
2234 : :
2235 : 0 : void enable_percpu_irq(unsigned int irq, unsigned int type)
2236 : : {
2237 : 0 : unsigned int cpu = smp_processor_id();
2238 : 0 : unsigned long flags;
2239 : 0 : struct irq_desc *desc = irq_get_desc_lock(irq, &flags, IRQ_GET_DESC_CHECK_PERCPU);
2240 : :
2241 [ # # ]: 0 : if (!desc)
2242 : 0 : return;
2243 : :
2244 : : /*
2245 : : * If the trigger type is not specified by the caller, then
2246 : : * use the default for this interrupt.
2247 : : */
2248 : 0 : type &= IRQ_TYPE_SENSE_MASK;
2249 [ # # ]: 0 : if (type == IRQ_TYPE_NONE)
2250 : 0 : type = irqd_get_trigger_type(&desc->irq_data);
2251 : :
2252 [ # # ]: 0 : if (type != IRQ_TYPE_NONE) {
2253 : 0 : int ret;
2254 : :
2255 : 0 : ret = __irq_set_trigger(desc, type);
2256 : :
2257 [ # # ]: 0 : if (ret) {
2258 : 0 : WARN(1, "failed to set type for IRQ%d\n", irq);
2259 : 0 : goto out;
2260 : : }
2261 : : }
2262 : :
2263 : 0 : irq_percpu_enable(desc, cpu);
2264 : 0 : out:
2265 : 0 : irq_put_desc_unlock(desc, flags);
2266 : : }
2267 : : EXPORT_SYMBOL_GPL(enable_percpu_irq);
2268 : :
2269 : 0 : void enable_percpu_nmi(unsigned int irq, unsigned int type)
2270 : : {
2271 : 0 : enable_percpu_irq(irq, type);
2272 : 0 : }
2273 : :
2274 : : /**
2275 : : * irq_percpu_is_enabled - Check whether the per cpu irq is enabled
2276 : : * @irq: Linux irq number to check for
2277 : : *
2278 : : * Must be called from a non migratable context. Returns the enable
2279 : : * state of a per cpu interrupt on the current cpu.
2280 : : */
2281 : 0 : bool irq_percpu_is_enabled(unsigned int irq)
2282 : : {
2283 : 0 : unsigned int cpu = smp_processor_id();
2284 : 0 : struct irq_desc *desc;
2285 : 0 : unsigned long flags;
2286 : 0 : bool is_enabled;
2287 : :
2288 : 0 : desc = irq_get_desc_lock(irq, &flags, IRQ_GET_DESC_CHECK_PERCPU);
2289 [ # # ]: 0 : if (!desc)
2290 : : return false;
2291 : :
2292 : 0 : is_enabled = cpumask_test_cpu(cpu, desc->percpu_enabled);
2293 : 0 : irq_put_desc_unlock(desc, flags);
2294 : :
2295 : 0 : return is_enabled;
2296 : : }
2297 : : EXPORT_SYMBOL_GPL(irq_percpu_is_enabled);
2298 : :
2299 : 0 : void disable_percpu_irq(unsigned int irq)
2300 : : {
2301 : 0 : unsigned int cpu = smp_processor_id();
2302 : 0 : unsigned long flags;
2303 : 0 : struct irq_desc *desc = irq_get_desc_lock(irq, &flags, IRQ_GET_DESC_CHECK_PERCPU);
2304 : :
2305 [ # # ]: 0 : if (!desc)
2306 : 0 : return;
2307 : :
2308 : 0 : irq_percpu_disable(desc, cpu);
2309 : 0 : irq_put_desc_unlock(desc, flags);
2310 : : }
2311 : : EXPORT_SYMBOL_GPL(disable_percpu_irq);
2312 : :
2313 : 0 : void disable_percpu_nmi(unsigned int irq)
2314 : : {
2315 : 0 : disable_percpu_irq(irq);
2316 : 0 : }
2317 : :
2318 : : /*
2319 : : * Internal function to unregister a percpu irqaction.
2320 : : */
2321 : 0 : static struct irqaction *__free_percpu_irq(unsigned int irq, void __percpu *dev_id)
2322 : : {
2323 : 0 : struct irq_desc *desc = irq_to_desc(irq);
2324 : 0 : struct irqaction *action;
2325 : 0 : unsigned long flags;
2326 : :
2327 [ # # ]: 0 : WARN(in_interrupt(), "Trying to free IRQ %d from IRQ context!\n", irq);
2328 : :
2329 [ # # ]: 0 : if (!desc)
2330 : : return NULL;
2331 : :
2332 : 0 : raw_spin_lock_irqsave(&desc->lock, flags);
2333 : :
2334 : 0 : action = desc->action;
2335 [ # # # # ]: 0 : if (!action || action->percpu_dev_id != dev_id) {
2336 : 0 : WARN(1, "Trying to free already-free IRQ %d\n", irq);
2337 : 0 : goto bad;
2338 : : }
2339 : :
2340 [ # # ]: 0 : if (!cpumask_empty(desc->percpu_enabled)) {
2341 : 0 : WARN(1, "percpu IRQ %d still enabled on CPU%d!\n",
2342 : : irq, cpumask_first(desc->percpu_enabled));
2343 : 0 : goto bad;
2344 : : }
2345 : :
2346 : : /* Found it - now remove it from the list of entries: */
2347 : 0 : desc->action = NULL;
2348 : :
2349 : 0 : desc->istate &= ~IRQS_NMI;
2350 : :
2351 : 0 : raw_spin_unlock_irqrestore(&desc->lock, flags);
2352 : :
2353 : 0 : unregister_handler_proc(irq, action);
2354 : :
2355 : 0 : irq_chip_pm_put(&desc->irq_data);
2356 : 0 : module_put(desc->owner);
2357 : 0 : return action;
2358 : :
2359 : 0 : bad:
2360 : 0 : raw_spin_unlock_irqrestore(&desc->lock, flags);
2361 : 0 : return NULL;
2362 : : }
2363 : :
2364 : : /**
2365 : : * remove_percpu_irq - free a per-cpu interrupt
2366 : : * @irq: Interrupt line to free
2367 : : * @act: irqaction for the interrupt
2368 : : *
2369 : : * Used to remove interrupts statically setup by the early boot process.
2370 : : */
2371 : 0 : void remove_percpu_irq(unsigned int irq, struct irqaction *act)
2372 : : {
2373 : 0 : struct irq_desc *desc = irq_to_desc(irq);
2374 : :
2375 [ # # # # ]: 0 : if (desc && irq_settings_is_per_cpu_devid(desc))
2376 : 0 : __free_percpu_irq(irq, act->percpu_dev_id);
2377 : 0 : }
2378 : :
2379 : : /**
2380 : : * free_percpu_irq - free an interrupt allocated with request_percpu_irq
2381 : : * @irq: Interrupt line to free
2382 : : * @dev_id: Device identity to free
2383 : : *
2384 : : * Remove a percpu interrupt handler. The handler is removed, but
2385 : : * the interrupt line is not disabled. This must be done on each
2386 : : * CPU before calling this function. The function does not return
2387 : : * until any executing interrupts for this IRQ have completed.
2388 : : *
2389 : : * This function must not be called from interrupt context.
2390 : : */
2391 : 0 : void free_percpu_irq(unsigned int irq, void __percpu *dev_id)
2392 : : {
2393 : 0 : struct irq_desc *desc = irq_to_desc(irq);
2394 : :
2395 [ # # # # ]: 0 : if (!desc || !irq_settings_is_per_cpu_devid(desc))
2396 : : return;
2397 : :
2398 [ # # ]: 0 : chip_bus_lock(desc);
2399 : 0 : kfree(__free_percpu_irq(irq, dev_id));
2400 [ # # ]: 0 : chip_bus_sync_unlock(desc);
2401 : : }
2402 : : EXPORT_SYMBOL_GPL(free_percpu_irq);
2403 : :
2404 : 0 : void free_percpu_nmi(unsigned int irq, void __percpu *dev_id)
2405 : : {
2406 : 0 : struct irq_desc *desc = irq_to_desc(irq);
2407 : :
2408 [ # # # # ]: 0 : if (!desc || !irq_settings_is_per_cpu_devid(desc))
2409 : : return;
2410 : :
2411 [ # # # # ]: 0 : if (WARN_ON(!(desc->istate & IRQS_NMI)))
2412 : : return;
2413 : :
2414 : 0 : kfree(__free_percpu_irq(irq, dev_id));
2415 : : }
2416 : :
2417 : : /**
2418 : : * setup_percpu_irq - setup a per-cpu interrupt
2419 : : * @irq: Interrupt line to setup
2420 : : * @act: irqaction for the interrupt
2421 : : *
2422 : : * Used to statically setup per-cpu interrupts in the early boot process.
2423 : : */
2424 : 0 : int setup_percpu_irq(unsigned int irq, struct irqaction *act)
2425 : : {
2426 : 0 : struct irq_desc *desc = irq_to_desc(irq);
2427 : 0 : int retval;
2428 : :
2429 [ # # # # ]: 0 : if (!desc || !irq_settings_is_per_cpu_devid(desc))
2430 : : return -EINVAL;
2431 : :
2432 : 0 : retval = irq_chip_pm_get(&desc->irq_data);
2433 [ # # ]: 0 : if (retval < 0)
2434 : : return retval;
2435 : :
2436 : 0 : retval = __setup_irq(irq, desc, act);
2437 : :
2438 [ # # ]: 0 : if (retval)
2439 : 0 : irq_chip_pm_put(&desc->irq_data);
2440 : :
2441 : : return retval;
2442 : : }
2443 : :
2444 : : /**
2445 : : * __request_percpu_irq - allocate a percpu interrupt line
2446 : : * @irq: Interrupt line to allocate
2447 : : * @handler: Function to be called when the IRQ occurs.
2448 : : * @flags: Interrupt type flags (IRQF_TIMER only)
2449 : : * @devname: An ascii name for the claiming device
2450 : : * @dev_id: A percpu cookie passed back to the handler function
2451 : : *
2452 : : * This call allocates interrupt resources and enables the
2453 : : * interrupt on the local CPU. If the interrupt is supposed to be
2454 : : * enabled on other CPUs, it has to be done on each CPU using
2455 : : * enable_percpu_irq().
2456 : : *
2457 : : * Dev_id must be globally unique. It is a per-cpu variable, and
2458 : : * the handler gets called with the interrupted CPU's instance of
2459 : : * that variable.
2460 : : */
2461 : 0 : int __request_percpu_irq(unsigned int irq, irq_handler_t handler,
2462 : : unsigned long flags, const char *devname,
2463 : : void __percpu *dev_id)
2464 : : {
2465 : 0 : struct irqaction *action;
2466 : 0 : struct irq_desc *desc;
2467 : 0 : int retval;
2468 : :
2469 [ # # ]: 0 : if (!dev_id)
2470 : : return -EINVAL;
2471 : :
2472 : 0 : desc = irq_to_desc(irq);
2473 [ # # # # : 0 : if (!desc || !irq_settings_can_request(desc) ||
# # ]
2474 : : !irq_settings_is_per_cpu_devid(desc))
2475 : : return -EINVAL;
2476 : :
2477 [ # # ]: 0 : if (flags && flags != IRQF_TIMER)
2478 : : return -EINVAL;
2479 : :
2480 : 0 : action = kzalloc(sizeof(struct irqaction), GFP_KERNEL);
2481 [ # # ]: 0 : if (!action)
2482 : : return -ENOMEM;
2483 : :
2484 : 0 : action->handler = handler;
2485 : 0 : action->flags = flags | IRQF_PERCPU | IRQF_NO_SUSPEND;
2486 : 0 : action->name = devname;
2487 : 0 : action->percpu_dev_id = dev_id;
2488 : :
2489 : 0 : retval = irq_chip_pm_get(&desc->irq_data);
2490 [ # # ]: 0 : if (retval < 0) {
2491 : 0 : kfree(action);
2492 : 0 : return retval;
2493 : : }
2494 : :
2495 : 0 : retval = __setup_irq(irq, desc, action);
2496 : :
2497 [ # # ]: 0 : if (retval) {
2498 : 0 : irq_chip_pm_put(&desc->irq_data);
2499 : 0 : kfree(action);
2500 : : }
2501 : :
2502 : : return retval;
2503 : : }
2504 : : EXPORT_SYMBOL_GPL(__request_percpu_irq);
2505 : :
2506 : : /**
2507 : : * request_percpu_nmi - allocate a percpu interrupt line for NMI delivery
2508 : : * @irq: Interrupt line to allocate
2509 : : * @handler: Function to be called when the IRQ occurs.
2510 : : * @name: An ascii name for the claiming device
2511 : : * @dev_id: A percpu cookie passed back to the handler function
2512 : : *
2513 : : * This call allocates interrupt resources for a per CPU NMI. Per CPU NMIs
2514 : : * have to be setup on each CPU by calling prepare_percpu_nmi() before
2515 : : * being enabled on the same CPU by using enable_percpu_nmi().
2516 : : *
2517 : : * Dev_id must be globally unique. It is a per-cpu variable, and
2518 : : * the handler gets called with the interrupted CPU's instance of
2519 : : * that variable.
2520 : : *
2521 : : * Interrupt lines requested for NMI delivering should have auto enabling
2522 : : * setting disabled.
2523 : : *
2524 : : * If the interrupt line cannot be used to deliver NMIs, function
2525 : : * will fail returning a negative value.
2526 : : */
2527 : 0 : int request_percpu_nmi(unsigned int irq, irq_handler_t handler,
2528 : : const char *name, void __percpu *dev_id)
2529 : : {
2530 : 0 : struct irqaction *action;
2531 : 0 : struct irq_desc *desc;
2532 : 0 : unsigned long flags;
2533 : 0 : int retval;
2534 : :
2535 [ # # ]: 0 : if (!handler)
2536 : : return -EINVAL;
2537 : :
2538 : 0 : desc = irq_to_desc(irq);
2539 : :
2540 [ # # # # : 0 : if (!desc || !irq_settings_can_request(desc) ||
# # ]
2541 [ # # ]: 0 : !irq_settings_is_per_cpu_devid(desc) ||
2542 [ # # ]: 0 : irq_settings_can_autoenable(desc) ||
2543 : : !irq_supports_nmi(desc))
2544 : : return -EINVAL;
2545 : :
2546 : : /* The line cannot already be NMI */
2547 [ # # ]: 0 : if (desc->istate & IRQS_NMI)
2548 : : return -EINVAL;
2549 : :
2550 : 0 : action = kzalloc(sizeof(struct irqaction), GFP_KERNEL);
2551 [ # # ]: 0 : if (!action)
2552 : : return -ENOMEM;
2553 : :
2554 : 0 : action->handler = handler;
2555 : 0 : action->flags = IRQF_PERCPU | IRQF_NO_SUSPEND | IRQF_NO_THREAD
2556 : : | IRQF_NOBALANCING;
2557 : 0 : action->name = name;
2558 : 0 : action->percpu_dev_id = dev_id;
2559 : :
2560 : 0 : retval = irq_chip_pm_get(&desc->irq_data);
2561 [ # # ]: 0 : if (retval < 0)
2562 : 0 : goto err_out;
2563 : :
2564 : 0 : retval = __setup_irq(irq, desc, action);
2565 [ # # ]: 0 : if (retval)
2566 : 0 : goto err_irq_setup;
2567 : :
2568 : 0 : raw_spin_lock_irqsave(&desc->lock, flags);
2569 : 0 : desc->istate |= IRQS_NMI;
2570 : 0 : raw_spin_unlock_irqrestore(&desc->lock, flags);
2571 : :
2572 : 0 : return 0;
2573 : :
2574 : : err_irq_setup:
2575 : 0 : irq_chip_pm_put(&desc->irq_data);
2576 : 0 : err_out:
2577 : 0 : kfree(action);
2578 : :
2579 : 0 : return retval;
2580 : : }
2581 : :
2582 : : /**
2583 : : * prepare_percpu_nmi - performs CPU local setup for NMI delivery
2584 : : * @irq: Interrupt line to prepare for NMI delivery
2585 : : *
2586 : : * This call prepares an interrupt line to deliver NMI on the current CPU,
2587 : : * before that interrupt line gets enabled with enable_percpu_nmi().
2588 : : *
2589 : : * As a CPU local operation, this should be called from non-preemptible
2590 : : * context.
2591 : : *
2592 : : * If the interrupt line cannot be used to deliver NMIs, function
2593 : : * will fail returning a negative value.
2594 : : */
2595 : 0 : int prepare_percpu_nmi(unsigned int irq)
2596 : : {
2597 : 0 : unsigned long flags;
2598 : 0 : struct irq_desc *desc;
2599 : 0 : int ret = 0;
2600 : :
2601 : 0 : WARN_ON(preemptible());
2602 : :
2603 : 0 : desc = irq_get_desc_lock(irq, &flags,
2604 : : IRQ_GET_DESC_CHECK_PERCPU);
2605 [ # # ]: 0 : if (!desc)
2606 : : return -EINVAL;
2607 : :
2608 [ # # # # ]: 0 : if (WARN(!(desc->istate & IRQS_NMI),
2609 : : KERN_ERR "prepare_percpu_nmi called for a non-NMI interrupt: irq %u\n",
2610 : : irq)) {
2611 : 0 : ret = -EINVAL;
2612 : 0 : goto out;
2613 : : }
2614 : :
2615 [ # # ]: 0 : ret = irq_nmi_setup(desc);
2616 [ # # ]: 0 : if (ret) {
2617 : 0 : pr_err("Failed to setup NMI delivery: irq %u\n", irq);
2618 : 0 : goto out;
2619 : : }
2620 : :
2621 : 0 : out:
2622 : 0 : irq_put_desc_unlock(desc, flags);
2623 : 0 : return ret;
2624 : : }
2625 : :
2626 : : /**
2627 : : * teardown_percpu_nmi - undoes NMI setup of IRQ line
2628 : : * @irq: Interrupt line from which CPU local NMI configuration should be
2629 : : * removed
2630 : : *
2631 : : * This call undoes the setup done by prepare_percpu_nmi().
2632 : : *
2633 : : * IRQ line should not be enabled for the current CPU.
2634 : : *
2635 : : * As a CPU local operation, this should be called from non-preemptible
2636 : : * context.
2637 : : */
2638 : 0 : void teardown_percpu_nmi(unsigned int irq)
2639 : : {
2640 : 0 : unsigned long flags;
2641 : 0 : struct irq_desc *desc;
2642 : :
2643 : 0 : WARN_ON(preemptible());
2644 : :
2645 : 0 : desc = irq_get_desc_lock(irq, &flags,
2646 : : IRQ_GET_DESC_CHECK_PERCPU);
2647 [ # # ]: 0 : if (!desc)
2648 : 0 : return;
2649 : :
2650 [ # # # # ]: 0 : if (WARN_ON(!(desc->istate & IRQS_NMI)))
2651 : 0 : goto out;
2652 : :
2653 [ # # ]: 0 : irq_nmi_teardown(desc);
2654 : 0 : out:
2655 : 0 : irq_put_desc_unlock(desc, flags);
2656 : : }
2657 : :
2658 : 0 : int __irq_get_irqchip_state(struct irq_data *data, enum irqchip_irq_state which,
2659 : : bool *state)
2660 : : {
2661 : 0 : struct irq_chip *chip;
2662 : 0 : int err = -EINVAL;
2663 : :
2664 : 13 : do {
2665 [ - - - - : 13 : chip = irq_data_get_irq_chip(data);
- + ]
2666 [ - - - - : 13 : if (chip->irq_get_irqchip_state)
- + ]
2667 : : break;
2668 : : #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
2669 : 0 : data = data->parent_data;
2670 : : #else
2671 : : data = NULL;
2672 : : #endif
2673 [ # # # # : 0 : } while (data);
# # ]
2674 : :
2675 [ - - - - : 13 : if (data)
+ - ]
2676 : 13 : err = chip->irq_get_irqchip_state(data, which, state);
2677 : 0 : return err;
2678 : : }
2679 : :
2680 : : /**
2681 : : * irq_get_irqchip_state - returns the irqchip state of a interrupt.
2682 : : * @irq: Interrupt line that is forwarded to a VM
2683 : : * @which: One of IRQCHIP_STATE_* the caller wants to know about
2684 : : * @state: a pointer to a boolean where the state is to be storeed
2685 : : *
2686 : : * This call snapshots the internal irqchip state of an
2687 : : * interrupt, returning into @state the bit corresponding to
2688 : : * stage @which
2689 : : *
2690 : : * This function should be called with preemption disabled if the
2691 : : * interrupt controller has per-cpu registers.
2692 : : */
2693 : 0 : int irq_get_irqchip_state(unsigned int irq, enum irqchip_irq_state which,
2694 : : bool *state)
2695 : : {
2696 : 0 : struct irq_desc *desc;
2697 : 0 : struct irq_data *data;
2698 : 0 : unsigned long flags;
2699 : 0 : int err = -EINVAL;
2700 : :
2701 : 0 : desc = irq_get_desc_buslock(irq, &flags, 0);
2702 [ # # ]: 0 : if (!desc)
2703 : : return err;
2704 : :
2705 : 0 : data = irq_desc_get_irq_data(desc);
2706 : :
2707 : 0 : err = __irq_get_irqchip_state(data, which, state);
2708 : :
2709 : 0 : irq_put_desc_busunlock(desc, flags);
2710 : 0 : return err;
2711 : : }
2712 : : EXPORT_SYMBOL_GPL(irq_get_irqchip_state);
2713 : :
2714 : : /**
2715 : : * irq_set_irqchip_state - set the state of a forwarded interrupt.
2716 : : * @irq: Interrupt line that is forwarded to a VM
2717 : : * @which: State to be restored (one of IRQCHIP_STATE_*)
2718 : : * @val: Value corresponding to @which
2719 : : *
2720 : : * This call sets the internal irqchip state of an interrupt,
2721 : : * depending on the value of @which.
2722 : : *
2723 : : * This function should be called with preemption disabled if the
2724 : : * interrupt controller has per-cpu registers.
2725 : : */
2726 : 0 : int irq_set_irqchip_state(unsigned int irq, enum irqchip_irq_state which,
2727 : : bool val)
2728 : : {
2729 : 0 : struct irq_desc *desc;
2730 : 0 : struct irq_data *data;
2731 : 0 : struct irq_chip *chip;
2732 : 0 : unsigned long flags;
2733 : 0 : int err = -EINVAL;
2734 : :
2735 : 0 : desc = irq_get_desc_buslock(irq, &flags, 0);
2736 [ # # ]: 0 : if (!desc)
2737 : : return err;
2738 : :
2739 : 0 : data = irq_desc_get_irq_data(desc);
2740 : :
2741 : 0 : do {
2742 [ # # ]: 0 : chip = irq_data_get_irq_chip(data);
2743 [ # # ]: 0 : if (chip->irq_set_irqchip_state)
2744 : : break;
2745 : : #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
2746 : 0 : data = data->parent_data;
2747 : : #else
2748 : : data = NULL;
2749 : : #endif
2750 [ # # ]: 0 : } while (data);
2751 : :
2752 [ # # ]: 0 : if (data)
2753 : 0 : err = chip->irq_set_irqchip_state(data, which, val);
2754 : :
2755 : 0 : irq_put_desc_busunlock(desc, flags);
2756 : 0 : return err;
2757 : : }
2758 : : EXPORT_SYMBOL_GPL(irq_set_irqchip_state);
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