Loading...
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 1992, 1998-2004 Linus Torvalds, Ingo Molnar
4 *
5 * This file contains spurious interrupt handling.
6 */
7
8#include <linux/jiffies.h>
9#include <linux/irq.h>
10#include <linux/module.h>
11#include <linux/interrupt.h>
12#include <linux/moduleparam.h>
13#include <linux/timer.h>
14
15#include "internals.h"
16
17static int irqfixup __read_mostly;
18
19#define POLL_SPURIOUS_IRQ_INTERVAL (HZ/10)
20static void poll_spurious_irqs(struct timer_list *unused);
21static DEFINE_TIMER(poll_spurious_irq_timer, poll_spurious_irqs);
22static int irq_poll_cpu;
23static atomic_t irq_poll_active;
24
25/*
26 * We wait here for a poller to finish.
27 *
28 * If the poll runs on this CPU, then we yell loudly and return
29 * false. That will leave the interrupt line disabled in the worst
30 * case, but it should never happen.
31 *
32 * We wait until the poller is done and then recheck disabled and
33 * action (about to be disabled). Only if it's still active, we return
34 * true and let the handler run.
35 */
36bool irq_wait_for_poll(struct irq_desc *desc)
37{
38 if (WARN_ONCE(irq_poll_cpu == smp_processor_id(),
39 "irq poll in progress on cpu %d for irq %d\n",
40 smp_processor_id(), desc->irq_data.irq))
41 return false;
42
43#ifdef CONFIG_SMP
44 do {
45 raw_spin_unlock(&desc->lock);
46 while (irqd_irq_inprogress(&desc->irq_data))
47 cpu_relax();
48 raw_spin_lock(&desc->lock);
49 } while (irqd_irq_inprogress(&desc->irq_data));
50 /* Might have been disabled in meantime */
51 return !irqd_irq_disabled(&desc->irq_data) && desc->action;
52#else
53 return false;
54#endif
55}
56
57
58/*
59 * Recovery handler for misrouted interrupts.
60 */
61static int try_one_irq(struct irq_desc *desc, bool force)
62{
63 irqreturn_t ret = IRQ_NONE;
64 struct irqaction *action;
65
66 raw_spin_lock(&desc->lock);
67
68 /*
69 * PER_CPU, nested thread interrupts and interrupts explicitly
70 * marked polled are excluded from polling.
71 */
72 if (irq_settings_is_per_cpu(desc) ||
73 irq_settings_is_nested_thread(desc) ||
74 irq_settings_is_polled(desc))
75 goto out;
76
77 /*
78 * Do not poll disabled interrupts unless the spurious
79 * disabled poller asks explicitly.
80 */
81 if (irqd_irq_disabled(&desc->irq_data) && !force)
82 goto out;
83
84 /*
85 * All handlers must agree on IRQF_SHARED, so we test just the
86 * first.
87 */
88 action = desc->action;
89 if (!action || !(action->flags & IRQF_SHARED) ||
90 (action->flags & __IRQF_TIMER))
91 goto out;
92
93 /* Already running on another processor */
94 if (irqd_irq_inprogress(&desc->irq_data)) {
95 /*
96 * Already running: If it is shared get the other
97 * CPU to go looking for our mystery interrupt too
98 */
99 desc->istate |= IRQS_PENDING;
100 goto out;
101 }
102
103 /* Mark it poll in progress */
104 desc->istate |= IRQS_POLL_INPROGRESS;
105 do {
106 if (handle_irq_event(desc) == IRQ_HANDLED)
107 ret = IRQ_HANDLED;
108 /* Make sure that there is still a valid action */
109 action = desc->action;
110 } while ((desc->istate & IRQS_PENDING) && action);
111 desc->istate &= ~IRQS_POLL_INPROGRESS;
112out:
113 raw_spin_unlock(&desc->lock);
114 return ret == IRQ_HANDLED;
115}
116
117static int misrouted_irq(int irq)
118{
119 struct irq_desc *desc;
120 int i, ok = 0;
121
122 if (atomic_inc_return(&irq_poll_active) != 1)
123 goto out;
124
125 irq_poll_cpu = smp_processor_id();
126
127 for_each_irq_desc(i, desc) {
128 if (!i)
129 continue;
130
131 if (i == irq) /* Already tried */
132 continue;
133
134 if (try_one_irq(desc, false))
135 ok = 1;
136 }
137out:
138 atomic_dec(&irq_poll_active);
139 /* So the caller can adjust the irq error counts */
140 return ok;
141}
142
143static void poll_spurious_irqs(struct timer_list *unused)
144{
145 struct irq_desc *desc;
146 int i;
147
148 if (atomic_inc_return(&irq_poll_active) != 1)
149 goto out;
150 irq_poll_cpu = smp_processor_id();
151
152 for_each_irq_desc(i, desc) {
153 unsigned int state;
154
155 if (!i)
156 continue;
157
158 /* Racy but it doesn't matter */
159 state = desc->istate;
160 barrier();
161 if (!(state & IRQS_SPURIOUS_DISABLED))
162 continue;
163
164 local_irq_disable();
165 try_one_irq(desc, true);
166 local_irq_enable();
167 }
168out:
169 atomic_dec(&irq_poll_active);
170 mod_timer(&poll_spurious_irq_timer,
171 jiffies + POLL_SPURIOUS_IRQ_INTERVAL);
172}
173
174static inline int bad_action_ret(irqreturn_t action_ret)
175{
176 unsigned int r = action_ret;
177
178 if (likely(r <= (IRQ_HANDLED | IRQ_WAKE_THREAD)))
179 return 0;
180 return 1;
181}
182
183/*
184 * If 99,900 of the previous 100,000 interrupts have not been handled
185 * then assume that the IRQ is stuck in some manner. Drop a diagnostic
186 * and try to turn the IRQ off.
187 *
188 * (The other 100-of-100,000 interrupts may have been a correctly
189 * functioning device sharing an IRQ with the failing one)
190 */
191static void __report_bad_irq(struct irq_desc *desc, irqreturn_t action_ret)
192{
193 unsigned int irq = irq_desc_get_irq(desc);
194 struct irqaction *action;
195 unsigned long flags;
196
197 if (bad_action_ret(action_ret)) {
198 printk(KERN_ERR "irq event %d: bogus return value %x\n",
199 irq, action_ret);
200 } else {
201 printk(KERN_ERR "irq %d: nobody cared (try booting with "
202 "the \"irqpoll\" option)\n", irq);
203 }
204 dump_stack();
205 printk(KERN_ERR "handlers:\n");
206
207 /*
208 * We need to take desc->lock here. note_interrupt() is called
209 * w/o desc->lock held, but IRQ_PROGRESS set. We might race
210 * with something else removing an action. It's ok to take
211 * desc->lock here. See synchronize_irq().
212 */
213 raw_spin_lock_irqsave(&desc->lock, flags);
214 for_each_action_of_desc(desc, action) {
215 printk(KERN_ERR "[<%p>] %ps", action->handler, action->handler);
216 if (action->thread_fn)
217 printk(KERN_CONT " threaded [<%p>] %ps",
218 action->thread_fn, action->thread_fn);
219 printk(KERN_CONT "\n");
220 }
221 raw_spin_unlock_irqrestore(&desc->lock, flags);
222}
223
224static void report_bad_irq(struct irq_desc *desc, irqreturn_t action_ret)
225{
226 static int count = 100;
227
228 if (count > 0) {
229 count--;
230 __report_bad_irq(desc, action_ret);
231 }
232}
233
234static inline int
235try_misrouted_irq(unsigned int irq, struct irq_desc *desc,
236 irqreturn_t action_ret)
237{
238 struct irqaction *action;
239
240 if (!irqfixup)
241 return 0;
242
243 /* We didn't actually handle the IRQ - see if it was misrouted? */
244 if (action_ret == IRQ_NONE)
245 return 1;
246
247 /*
248 * But for 'irqfixup == 2' we also do it for handled interrupts if
249 * they are marked as IRQF_IRQPOLL (or for irq zero, which is the
250 * traditional PC timer interrupt.. Legacy)
251 */
252 if (irqfixup < 2)
253 return 0;
254
255 if (!irq)
256 return 1;
257
258 /*
259 * Since we don't get the descriptor lock, "action" can
260 * change under us. We don't really care, but we don't
261 * want to follow a NULL pointer. So tell the compiler to
262 * just load it once by using a barrier.
263 */
264 action = desc->action;
265 barrier();
266 return action && (action->flags & IRQF_IRQPOLL);
267}
268
269#define SPURIOUS_DEFERRED 0x80000000
270
271void note_interrupt(struct irq_desc *desc, irqreturn_t action_ret)
272{
273 unsigned int irq;
274
275 if (desc->istate & IRQS_POLL_INPROGRESS ||
276 irq_settings_is_polled(desc))
277 return;
278
279 if (bad_action_ret(action_ret)) {
280 report_bad_irq(desc, action_ret);
281 return;
282 }
283
284 /*
285 * We cannot call note_interrupt from the threaded handler
286 * because we need to look at the compound of all handlers
287 * (primary and threaded). Aside of that in the threaded
288 * shared case we have no serialization against an incoming
289 * hardware interrupt while we are dealing with a threaded
290 * result.
291 *
292 * So in case a thread is woken, we just note the fact and
293 * defer the analysis to the next hardware interrupt.
294 *
295 * The threaded handlers store whether they successfully
296 * handled an interrupt and we check whether that number
297 * changed versus the last invocation.
298 *
299 * We could handle all interrupts with the delayed by one
300 * mechanism, but for the non forced threaded case we'd just
301 * add pointless overhead to the straight hardirq interrupts
302 * for the sake of a few lines less code.
303 */
304 if (action_ret & IRQ_WAKE_THREAD) {
305 /*
306 * There is a thread woken. Check whether one of the
307 * shared primary handlers returned IRQ_HANDLED. If
308 * not we defer the spurious detection to the next
309 * interrupt.
310 */
311 if (action_ret == IRQ_WAKE_THREAD) {
312 int handled;
313 /*
314 * We use bit 31 of thread_handled_last to
315 * denote the deferred spurious detection
316 * active. No locking necessary as
317 * thread_handled_last is only accessed here
318 * and we have the guarantee that hard
319 * interrupts are not reentrant.
320 */
321 if (!(desc->threads_handled_last & SPURIOUS_DEFERRED)) {
322 desc->threads_handled_last |= SPURIOUS_DEFERRED;
323 return;
324 }
325 /*
326 * Check whether one of the threaded handlers
327 * returned IRQ_HANDLED since the last
328 * interrupt happened.
329 *
330 * For simplicity we just set bit 31, as it is
331 * set in threads_handled_last as well. So we
332 * avoid extra masking. And we really do not
333 * care about the high bits of the handled
334 * count. We just care about the count being
335 * different than the one we saw before.
336 */
337 handled = atomic_read(&desc->threads_handled);
338 handled |= SPURIOUS_DEFERRED;
339 if (handled != desc->threads_handled_last) {
340 action_ret = IRQ_HANDLED;
341 /*
342 * Note: We keep the SPURIOUS_DEFERRED
343 * bit set. We are handling the
344 * previous invocation right now.
345 * Keep it for the current one, so the
346 * next hardware interrupt will
347 * account for it.
348 */
349 desc->threads_handled_last = handled;
350 } else {
351 /*
352 * None of the threaded handlers felt
353 * responsible for the last interrupt
354 *
355 * We keep the SPURIOUS_DEFERRED bit
356 * set in threads_handled_last as we
357 * need to account for the current
358 * interrupt as well.
359 */
360 action_ret = IRQ_NONE;
361 }
362 } else {
363 /*
364 * One of the primary handlers returned
365 * IRQ_HANDLED. So we don't care about the
366 * threaded handlers on the same line. Clear
367 * the deferred detection bit.
368 *
369 * In theory we could/should check whether the
370 * deferred bit is set and take the result of
371 * the previous run into account here as
372 * well. But it's really not worth the
373 * trouble. If every other interrupt is
374 * handled we never trigger the spurious
375 * detector. And if this is just the one out
376 * of 100k unhandled ones which is handled
377 * then we merily delay the spurious detection
378 * by one hard interrupt. Not a real problem.
379 */
380 desc->threads_handled_last &= ~SPURIOUS_DEFERRED;
381 }
382 }
383
384 if (unlikely(action_ret == IRQ_NONE)) {
385 /*
386 * If we are seeing only the odd spurious IRQ caused by
387 * bus asynchronicity then don't eventually trigger an error,
388 * otherwise the counter becomes a doomsday timer for otherwise
389 * working systems
390 */
391 if (time_after(jiffies, desc->last_unhandled + HZ/10))
392 desc->irqs_unhandled = 1;
393 else
394 desc->irqs_unhandled++;
395 desc->last_unhandled = jiffies;
396 }
397
398 irq = irq_desc_get_irq(desc);
399 if (unlikely(try_misrouted_irq(irq, desc, action_ret))) {
400 int ok = misrouted_irq(irq);
401 if (action_ret == IRQ_NONE)
402 desc->irqs_unhandled -= ok;
403 }
404
405 desc->irq_count++;
406 if (likely(desc->irq_count < 100000))
407 return;
408
409 desc->irq_count = 0;
410 if (unlikely(desc->irqs_unhandled > 99900)) {
411 /*
412 * The interrupt is stuck
413 */
414 __report_bad_irq(desc, action_ret);
415 /*
416 * Now kill the IRQ
417 */
418 printk(KERN_EMERG "Disabling IRQ #%d\n", irq);
419 desc->istate |= IRQS_SPURIOUS_DISABLED;
420 desc->depth++;
421 irq_disable(desc);
422
423 mod_timer(&poll_spurious_irq_timer,
424 jiffies + POLL_SPURIOUS_IRQ_INTERVAL);
425 }
426 desc->irqs_unhandled = 0;
427}
428
429bool noirqdebug __read_mostly;
430
431int noirqdebug_setup(char *str)
432{
433 noirqdebug = 1;
434 printk(KERN_INFO "IRQ lockup detection disabled\n");
435
436 return 1;
437}
438
439__setup("noirqdebug", noirqdebug_setup);
440module_param(noirqdebug, bool, 0644);
441MODULE_PARM_DESC(noirqdebug, "Disable irq lockup detection when true");
442
443static int __init irqfixup_setup(char *str)
444{
445 irqfixup = 1;
446 printk(KERN_WARNING "Misrouted IRQ fixup support enabled.\n");
447 printk(KERN_WARNING "This may impact system performance.\n");
448
449 return 1;
450}
451
452__setup("irqfixup", irqfixup_setup);
453module_param(irqfixup, int, 0644);
454
455static int __init irqpoll_setup(char *str)
456{
457 irqfixup = 2;
458 printk(KERN_WARNING "Misrouted IRQ fixup and polling support "
459 "enabled\n");
460 printk(KERN_WARNING "This may significantly impact system "
461 "performance\n");
462 return 1;
463}
464
465__setup("irqpoll", irqpoll_setup);
1/*
2 * linux/kernel/irq/spurious.c
3 *
4 * Copyright (C) 1992, 1998-2004 Linus Torvalds, Ingo Molnar
5 *
6 * This file contains spurious interrupt handling.
7 */
8
9#include <linux/jiffies.h>
10#include <linux/irq.h>
11#include <linux/module.h>
12#include <linux/kallsyms.h>
13#include <linux/interrupt.h>
14#include <linux/moduleparam.h>
15#include <linux/timer.h>
16
17#include "internals.h"
18
19static int irqfixup __read_mostly;
20
21#define POLL_SPURIOUS_IRQ_INTERVAL (HZ/10)
22static void poll_spurious_irqs(unsigned long dummy);
23static DEFINE_TIMER(poll_spurious_irq_timer, poll_spurious_irqs, 0, 0);
24static int irq_poll_cpu;
25static atomic_t irq_poll_active;
26
27/*
28 * We wait here for a poller to finish.
29 *
30 * If the poll runs on this CPU, then we yell loudly and return
31 * false. That will leave the interrupt line disabled in the worst
32 * case, but it should never happen.
33 *
34 * We wait until the poller is done and then recheck disabled and
35 * action (about to be disabled). Only if it's still active, we return
36 * true and let the handler run.
37 */
38bool irq_wait_for_poll(struct irq_desc *desc)
39{
40 if (WARN_ONCE(irq_poll_cpu == smp_processor_id(),
41 "irq poll in progress on cpu %d for irq %d\n",
42 smp_processor_id(), desc->irq_data.irq))
43 return false;
44
45#ifdef CONFIG_SMP
46 do {
47 raw_spin_unlock(&desc->lock);
48 while (irqd_irq_inprogress(&desc->irq_data))
49 cpu_relax();
50 raw_spin_lock(&desc->lock);
51 } while (irqd_irq_inprogress(&desc->irq_data));
52 /* Might have been disabled in meantime */
53 return !irqd_irq_disabled(&desc->irq_data) && desc->action;
54#else
55 return false;
56#endif
57}
58
59
60/*
61 * Recovery handler for misrouted interrupts.
62 */
63static int try_one_irq(int irq, struct irq_desc *desc, bool force)
64{
65 irqreturn_t ret = IRQ_NONE;
66 struct irqaction *action;
67
68 raw_spin_lock(&desc->lock);
69
70 /* PER_CPU and nested thread interrupts are never polled */
71 if (irq_settings_is_per_cpu(desc) || irq_settings_is_nested_thread(desc))
72 goto out;
73
74 /*
75 * Do not poll disabled interrupts unless the spurious
76 * disabled poller asks explicitely.
77 */
78 if (irqd_irq_disabled(&desc->irq_data) && !force)
79 goto out;
80
81 /*
82 * All handlers must agree on IRQF_SHARED, so we test just the
83 * first. Check for action->next as well.
84 */
85 action = desc->action;
86 if (!action || !(action->flags & IRQF_SHARED) ||
87 (action->flags & __IRQF_TIMER) || !action->next)
88 goto out;
89
90 /* Already running on another processor */
91 if (irqd_irq_inprogress(&desc->irq_data)) {
92 /*
93 * Already running: If it is shared get the other
94 * CPU to go looking for our mystery interrupt too
95 */
96 desc->istate |= IRQS_PENDING;
97 goto out;
98 }
99
100 /* Mark it poll in progress */
101 desc->istate |= IRQS_POLL_INPROGRESS;
102 do {
103 if (handle_irq_event(desc) == IRQ_HANDLED)
104 ret = IRQ_HANDLED;
105 action = desc->action;
106 } while ((desc->istate & IRQS_PENDING) && action);
107 desc->istate &= ~IRQS_POLL_INPROGRESS;
108out:
109 raw_spin_unlock(&desc->lock);
110 return ret == IRQ_HANDLED;
111}
112
113static int misrouted_irq(int irq)
114{
115 struct irq_desc *desc;
116 int i, ok = 0;
117
118 if (atomic_inc_return(&irq_poll_active) == 1)
119 goto out;
120
121 irq_poll_cpu = smp_processor_id();
122
123 for_each_irq_desc(i, desc) {
124 if (!i)
125 continue;
126
127 if (i == irq) /* Already tried */
128 continue;
129
130 if (try_one_irq(i, desc, false))
131 ok = 1;
132 }
133out:
134 atomic_dec(&irq_poll_active);
135 /* So the caller can adjust the irq error counts */
136 return ok;
137}
138
139static void poll_spurious_irqs(unsigned long dummy)
140{
141 struct irq_desc *desc;
142 int i;
143
144 if (atomic_inc_return(&irq_poll_active) != 1)
145 goto out;
146 irq_poll_cpu = smp_processor_id();
147
148 for_each_irq_desc(i, desc) {
149 unsigned int state;
150
151 if (!i)
152 continue;
153
154 /* Racy but it doesn't matter */
155 state = desc->istate;
156 barrier();
157 if (!(state & IRQS_SPURIOUS_DISABLED))
158 continue;
159
160 local_irq_disable();
161 try_one_irq(i, desc, true);
162 local_irq_enable();
163 }
164out:
165 atomic_dec(&irq_poll_active);
166 mod_timer(&poll_spurious_irq_timer,
167 jiffies + POLL_SPURIOUS_IRQ_INTERVAL);
168}
169
170static inline int bad_action_ret(irqreturn_t action_ret)
171{
172 if (likely(action_ret <= (IRQ_HANDLED | IRQ_WAKE_THREAD)))
173 return 0;
174 return 1;
175}
176
177/*
178 * If 99,900 of the previous 100,000 interrupts have not been handled
179 * then assume that the IRQ is stuck in some manner. Drop a diagnostic
180 * and try to turn the IRQ off.
181 *
182 * (The other 100-of-100,000 interrupts may have been a correctly
183 * functioning device sharing an IRQ with the failing one)
184 */
185static void
186__report_bad_irq(unsigned int irq, struct irq_desc *desc,
187 irqreturn_t action_ret)
188{
189 struct irqaction *action;
190 unsigned long flags;
191
192 if (bad_action_ret(action_ret)) {
193 printk(KERN_ERR "irq event %d: bogus return value %x\n",
194 irq, action_ret);
195 } else {
196 printk(KERN_ERR "irq %d: nobody cared (try booting with "
197 "the \"irqpoll\" option)\n", irq);
198 }
199 dump_stack();
200 printk(KERN_ERR "handlers:\n");
201
202 /*
203 * We need to take desc->lock here. note_interrupt() is called
204 * w/o desc->lock held, but IRQ_PROGRESS set. We might race
205 * with something else removing an action. It's ok to take
206 * desc->lock here. See synchronize_irq().
207 */
208 raw_spin_lock_irqsave(&desc->lock, flags);
209 action = desc->action;
210 while (action) {
211 printk(KERN_ERR "[<%p>] %pf", action->handler, action->handler);
212 if (action->thread_fn)
213 printk(KERN_CONT " threaded [<%p>] %pf",
214 action->thread_fn, action->thread_fn);
215 printk(KERN_CONT "\n");
216 action = action->next;
217 }
218 raw_spin_unlock_irqrestore(&desc->lock, flags);
219}
220
221static void
222report_bad_irq(unsigned int irq, struct irq_desc *desc, irqreturn_t action_ret)
223{
224 static int count = 100;
225
226 if (count > 0) {
227 count--;
228 __report_bad_irq(irq, desc, action_ret);
229 }
230}
231
232static inline int
233try_misrouted_irq(unsigned int irq, struct irq_desc *desc,
234 irqreturn_t action_ret)
235{
236 struct irqaction *action;
237
238 if (!irqfixup)
239 return 0;
240
241 /* We didn't actually handle the IRQ - see if it was misrouted? */
242 if (action_ret == IRQ_NONE)
243 return 1;
244
245 /*
246 * But for 'irqfixup == 2' we also do it for handled interrupts if
247 * they are marked as IRQF_IRQPOLL (or for irq zero, which is the
248 * traditional PC timer interrupt.. Legacy)
249 */
250 if (irqfixup < 2)
251 return 0;
252
253 if (!irq)
254 return 1;
255
256 /*
257 * Since we don't get the descriptor lock, "action" can
258 * change under us. We don't really care, but we don't
259 * want to follow a NULL pointer. So tell the compiler to
260 * just load it once by using a barrier.
261 */
262 action = desc->action;
263 barrier();
264 return action && (action->flags & IRQF_IRQPOLL);
265}
266
267void note_interrupt(unsigned int irq, struct irq_desc *desc,
268 irqreturn_t action_ret)
269{
270 if (desc->istate & IRQS_POLL_INPROGRESS)
271 return;
272
273 /* we get here again via the threaded handler */
274 if (action_ret == IRQ_WAKE_THREAD)
275 return;
276
277 if (bad_action_ret(action_ret)) {
278 report_bad_irq(irq, desc, action_ret);
279 return;
280 }
281
282 if (unlikely(action_ret == IRQ_NONE)) {
283 /*
284 * If we are seeing only the odd spurious IRQ caused by
285 * bus asynchronicity then don't eventually trigger an error,
286 * otherwise the counter becomes a doomsday timer for otherwise
287 * working systems
288 */
289 if (time_after(jiffies, desc->last_unhandled + HZ/10))
290 desc->irqs_unhandled = 1;
291 else
292 desc->irqs_unhandled++;
293 desc->last_unhandled = jiffies;
294 }
295
296 if (unlikely(try_misrouted_irq(irq, desc, action_ret))) {
297 int ok = misrouted_irq(irq);
298 if (action_ret == IRQ_NONE)
299 desc->irqs_unhandled -= ok;
300 }
301
302 desc->irq_count++;
303 if (likely(desc->irq_count < 100000))
304 return;
305
306 desc->irq_count = 0;
307 if (unlikely(desc->irqs_unhandled > 99900)) {
308 /*
309 * The interrupt is stuck
310 */
311 __report_bad_irq(irq, desc, action_ret);
312 /*
313 * Now kill the IRQ
314 */
315 printk(KERN_EMERG "Disabling IRQ #%d\n", irq);
316 desc->istate |= IRQS_SPURIOUS_DISABLED;
317 desc->depth++;
318 irq_disable(desc);
319
320 mod_timer(&poll_spurious_irq_timer,
321 jiffies + POLL_SPURIOUS_IRQ_INTERVAL);
322 }
323 desc->irqs_unhandled = 0;
324}
325
326int noirqdebug __read_mostly;
327
328int noirqdebug_setup(char *str)
329{
330 noirqdebug = 1;
331 printk(KERN_INFO "IRQ lockup detection disabled\n");
332
333 return 1;
334}
335
336__setup("noirqdebug", noirqdebug_setup);
337module_param(noirqdebug, bool, 0644);
338MODULE_PARM_DESC(noirqdebug, "Disable irq lockup detection when true");
339
340static int __init irqfixup_setup(char *str)
341{
342 irqfixup = 1;
343 printk(KERN_WARNING "Misrouted IRQ fixup support enabled.\n");
344 printk(KERN_WARNING "This may impact system performance.\n");
345
346 return 1;
347}
348
349__setup("irqfixup", irqfixup_setup);
350module_param(irqfixup, int, 0644);
351
352static int __init irqpoll_setup(char *str)
353{
354 irqfixup = 2;
355 printk(KERN_WARNING "Misrouted IRQ fixup and polling support "
356 "enabled\n");
357 printk(KERN_WARNING "This may significantly impact system "
358 "performance\n");
359 return 1;
360}
361
362__setup("irqpoll", irqpoll_setup);