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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 1992, 1998-2004 Linus Torvalds, Ingo Molnar
4 *
5 * This file contains the /proc/irq/ handling code.
6 */
7
8#include <linux/irq.h>
9#include <linux/gfp.h>
10#include <linux/proc_fs.h>
11#include <linux/seq_file.h>
12#include <linux/interrupt.h>
13#include <linux/kernel_stat.h>
14#include <linux/mutex.h>
15
16#include "internals.h"
17
18/*
19 * Access rules:
20 *
21 * procfs protects read/write of /proc/irq/N/ files against a
22 * concurrent free of the interrupt descriptor. remove_proc_entry()
23 * immediately prevents new read/writes to happen and waits for
24 * already running read/write functions to complete.
25 *
26 * We remove the proc entries first and then delete the interrupt
27 * descriptor from the radix tree and free it. So it is guaranteed
28 * that irq_to_desc(N) is valid as long as the read/writes are
29 * permitted by procfs.
30 *
31 * The read from /proc/interrupts is a different problem because there
32 * is no protection. So the lookup and the access to irqdesc
33 * information must be protected by sparse_irq_lock.
34 */
35static struct proc_dir_entry *root_irq_dir;
36
37#ifdef CONFIG_SMP
38
39enum {
40 AFFINITY,
41 AFFINITY_LIST,
42 EFFECTIVE,
43 EFFECTIVE_LIST,
44};
45
46static int show_irq_affinity(int type, struct seq_file *m)
47{
48 struct irq_desc *desc = irq_to_desc((long)m->private);
49 const struct cpumask *mask;
50
51 switch (type) {
52 case AFFINITY:
53 case AFFINITY_LIST:
54 mask = desc->irq_common_data.affinity;
55#ifdef CONFIG_GENERIC_PENDING_IRQ
56 if (irqd_is_setaffinity_pending(&desc->irq_data))
57 mask = desc->pending_mask;
58#endif
59 break;
60 case EFFECTIVE:
61 case EFFECTIVE_LIST:
62#ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK
63 mask = irq_data_get_effective_affinity_mask(&desc->irq_data);
64 break;
65#endif
66 default:
67 return -EINVAL;
68 }
69
70 switch (type) {
71 case AFFINITY_LIST:
72 case EFFECTIVE_LIST:
73 seq_printf(m, "%*pbl\n", cpumask_pr_args(mask));
74 break;
75 case AFFINITY:
76 case EFFECTIVE:
77 seq_printf(m, "%*pb\n", cpumask_pr_args(mask));
78 break;
79 }
80 return 0;
81}
82
83static int irq_affinity_hint_proc_show(struct seq_file *m, void *v)
84{
85 struct irq_desc *desc = irq_to_desc((long)m->private);
86 unsigned long flags;
87 cpumask_var_t mask;
88
89 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
90 return -ENOMEM;
91
92 raw_spin_lock_irqsave(&desc->lock, flags);
93 if (desc->affinity_hint)
94 cpumask_copy(mask, desc->affinity_hint);
95 raw_spin_unlock_irqrestore(&desc->lock, flags);
96
97 seq_printf(m, "%*pb\n", cpumask_pr_args(mask));
98 free_cpumask_var(mask);
99
100 return 0;
101}
102
103int no_irq_affinity;
104static int irq_affinity_proc_show(struct seq_file *m, void *v)
105{
106 return show_irq_affinity(AFFINITY, m);
107}
108
109static int irq_affinity_list_proc_show(struct seq_file *m, void *v)
110{
111 return show_irq_affinity(AFFINITY_LIST, m);
112}
113
114
115static ssize_t write_irq_affinity(int type, struct file *file,
116 const char __user *buffer, size_t count, loff_t *pos)
117{
118 unsigned int irq = (int)(long)PDE_DATA(file_inode(file));
119 cpumask_var_t new_value;
120 int err;
121
122 if (!irq_can_set_affinity_usr(irq) || no_irq_affinity)
123 return -EIO;
124
125 if (!alloc_cpumask_var(&new_value, GFP_KERNEL))
126 return -ENOMEM;
127
128 if (type)
129 err = cpumask_parselist_user(buffer, count, new_value);
130 else
131 err = cpumask_parse_user(buffer, count, new_value);
132 if (err)
133 goto free_cpumask;
134
135 /*
136 * Do not allow disabling IRQs completely - it's a too easy
137 * way to make the system unusable accidentally :-) At least
138 * one online CPU still has to be targeted.
139 */
140 if (!cpumask_intersects(new_value, cpu_online_mask)) {
141 /*
142 * Special case for empty set - allow the architecture code
143 * to set default SMP affinity.
144 */
145 err = irq_select_affinity_usr(irq) ? -EINVAL : count;
146 } else {
147 err = irq_set_affinity(irq, new_value);
148 if (!err)
149 err = count;
150 }
151
152free_cpumask:
153 free_cpumask_var(new_value);
154 return err;
155}
156
157static ssize_t irq_affinity_proc_write(struct file *file,
158 const char __user *buffer, size_t count, loff_t *pos)
159{
160 return write_irq_affinity(0, file, buffer, count, pos);
161}
162
163static ssize_t irq_affinity_list_proc_write(struct file *file,
164 const char __user *buffer, size_t count, loff_t *pos)
165{
166 return write_irq_affinity(1, file, buffer, count, pos);
167}
168
169static int irq_affinity_proc_open(struct inode *inode, struct file *file)
170{
171 return single_open(file, irq_affinity_proc_show, PDE_DATA(inode));
172}
173
174static int irq_affinity_list_proc_open(struct inode *inode, struct file *file)
175{
176 return single_open(file, irq_affinity_list_proc_show, PDE_DATA(inode));
177}
178
179static const struct file_operations irq_affinity_proc_fops = {
180 .open = irq_affinity_proc_open,
181 .read = seq_read,
182 .llseek = seq_lseek,
183 .release = single_release,
184 .write = irq_affinity_proc_write,
185};
186
187static const struct file_operations irq_affinity_list_proc_fops = {
188 .open = irq_affinity_list_proc_open,
189 .read = seq_read,
190 .llseek = seq_lseek,
191 .release = single_release,
192 .write = irq_affinity_list_proc_write,
193};
194
195#ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK
196static int irq_effective_aff_proc_show(struct seq_file *m, void *v)
197{
198 return show_irq_affinity(EFFECTIVE, m);
199}
200
201static int irq_effective_aff_list_proc_show(struct seq_file *m, void *v)
202{
203 return show_irq_affinity(EFFECTIVE_LIST, m);
204}
205#endif
206
207static int default_affinity_show(struct seq_file *m, void *v)
208{
209 seq_printf(m, "%*pb\n", cpumask_pr_args(irq_default_affinity));
210 return 0;
211}
212
213static ssize_t default_affinity_write(struct file *file,
214 const char __user *buffer, size_t count, loff_t *ppos)
215{
216 cpumask_var_t new_value;
217 int err;
218
219 if (!alloc_cpumask_var(&new_value, GFP_KERNEL))
220 return -ENOMEM;
221
222 err = cpumask_parse_user(buffer, count, new_value);
223 if (err)
224 goto out;
225
226 /*
227 * Do not allow disabling IRQs completely - it's a too easy
228 * way to make the system unusable accidentally :-) At least
229 * one online CPU still has to be targeted.
230 */
231 if (!cpumask_intersects(new_value, cpu_online_mask)) {
232 err = -EINVAL;
233 goto out;
234 }
235
236 cpumask_copy(irq_default_affinity, new_value);
237 err = count;
238
239out:
240 free_cpumask_var(new_value);
241 return err;
242}
243
244static int default_affinity_open(struct inode *inode, struct file *file)
245{
246 return single_open(file, default_affinity_show, PDE_DATA(inode));
247}
248
249static const struct file_operations default_affinity_proc_fops = {
250 .open = default_affinity_open,
251 .read = seq_read,
252 .llseek = seq_lseek,
253 .release = single_release,
254 .write = default_affinity_write,
255};
256
257static int irq_node_proc_show(struct seq_file *m, void *v)
258{
259 struct irq_desc *desc = irq_to_desc((long) m->private);
260
261 seq_printf(m, "%d\n", irq_desc_get_node(desc));
262 return 0;
263}
264#endif
265
266static int irq_spurious_proc_show(struct seq_file *m, void *v)
267{
268 struct irq_desc *desc = irq_to_desc((long) m->private);
269
270 seq_printf(m, "count %u\n" "unhandled %u\n" "last_unhandled %u ms\n",
271 desc->irq_count, desc->irqs_unhandled,
272 jiffies_to_msecs(desc->last_unhandled));
273 return 0;
274}
275
276#define MAX_NAMELEN 128
277
278static int name_unique(unsigned int irq, struct irqaction *new_action)
279{
280 struct irq_desc *desc = irq_to_desc(irq);
281 struct irqaction *action;
282 unsigned long flags;
283 int ret = 1;
284
285 raw_spin_lock_irqsave(&desc->lock, flags);
286 for_each_action_of_desc(desc, action) {
287 if ((action != new_action) && action->name &&
288 !strcmp(new_action->name, action->name)) {
289 ret = 0;
290 break;
291 }
292 }
293 raw_spin_unlock_irqrestore(&desc->lock, flags);
294 return ret;
295}
296
297void register_handler_proc(unsigned int irq, struct irqaction *action)
298{
299 char name [MAX_NAMELEN];
300 struct irq_desc *desc = irq_to_desc(irq);
301
302 if (!desc->dir || action->dir || !action->name ||
303 !name_unique(irq, action))
304 return;
305
306 snprintf(name, MAX_NAMELEN, "%s", action->name);
307
308 /* create /proc/irq/1234/handler/ */
309 action->dir = proc_mkdir(name, desc->dir);
310}
311
312#undef MAX_NAMELEN
313
314#define MAX_NAMELEN 10
315
316void register_irq_proc(unsigned int irq, struct irq_desc *desc)
317{
318 static DEFINE_MUTEX(register_lock);
319 void __maybe_unused *irqp = (void *)(unsigned long) irq;
320 char name [MAX_NAMELEN];
321
322 if (!root_irq_dir || (desc->irq_data.chip == &no_irq_chip))
323 return;
324
325 /*
326 * irq directories are registered only when a handler is
327 * added, not when the descriptor is created, so multiple
328 * tasks might try to register at the same time.
329 */
330 mutex_lock(®ister_lock);
331
332 if (desc->dir)
333 goto out_unlock;
334
335 sprintf(name, "%d", irq);
336
337 /* create /proc/irq/1234 */
338 desc->dir = proc_mkdir(name, root_irq_dir);
339 if (!desc->dir)
340 goto out_unlock;
341
342#ifdef CONFIG_SMP
343 /* create /proc/irq/<irq>/smp_affinity */
344 proc_create_data("smp_affinity", 0644, desc->dir,
345 &irq_affinity_proc_fops, irqp);
346
347 /* create /proc/irq/<irq>/affinity_hint */
348 proc_create_single_data("affinity_hint", 0444, desc->dir,
349 irq_affinity_hint_proc_show, irqp);
350
351 /* create /proc/irq/<irq>/smp_affinity_list */
352 proc_create_data("smp_affinity_list", 0644, desc->dir,
353 &irq_affinity_list_proc_fops, irqp);
354
355 proc_create_single_data("node", 0444, desc->dir, irq_node_proc_show,
356 irqp);
357# ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK
358 proc_create_single_data("effective_affinity", 0444, desc->dir,
359 irq_effective_aff_proc_show, irqp);
360 proc_create_single_data("effective_affinity_list", 0444, desc->dir,
361 irq_effective_aff_list_proc_show, irqp);
362# endif
363#endif
364 proc_create_single_data("spurious", 0444, desc->dir,
365 irq_spurious_proc_show, (void *)(long)irq);
366
367out_unlock:
368 mutex_unlock(®ister_lock);
369}
370
371void unregister_irq_proc(unsigned int irq, struct irq_desc *desc)
372{
373 char name [MAX_NAMELEN];
374
375 if (!root_irq_dir || !desc->dir)
376 return;
377#ifdef CONFIG_SMP
378 remove_proc_entry("smp_affinity", desc->dir);
379 remove_proc_entry("affinity_hint", desc->dir);
380 remove_proc_entry("smp_affinity_list", desc->dir);
381 remove_proc_entry("node", desc->dir);
382# ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK
383 remove_proc_entry("effective_affinity", desc->dir);
384 remove_proc_entry("effective_affinity_list", desc->dir);
385# endif
386#endif
387 remove_proc_entry("spurious", desc->dir);
388
389 sprintf(name, "%u", irq);
390 remove_proc_entry(name, root_irq_dir);
391}
392
393#undef MAX_NAMELEN
394
395void unregister_handler_proc(unsigned int irq, struct irqaction *action)
396{
397 proc_remove(action->dir);
398}
399
400static void register_default_affinity_proc(void)
401{
402#ifdef CONFIG_SMP
403 proc_create("irq/default_smp_affinity", 0644, NULL,
404 &default_affinity_proc_fops);
405#endif
406}
407
408void init_irq_proc(void)
409{
410 unsigned int irq;
411 struct irq_desc *desc;
412
413 /* create /proc/irq */
414 root_irq_dir = proc_mkdir("irq", NULL);
415 if (!root_irq_dir)
416 return;
417
418 register_default_affinity_proc();
419
420 /*
421 * Create entries for all existing IRQs.
422 */
423 for_each_irq_desc(irq, desc)
424 register_irq_proc(irq, desc);
425}
426
427#ifdef CONFIG_GENERIC_IRQ_SHOW
428
429int __weak arch_show_interrupts(struct seq_file *p, int prec)
430{
431 return 0;
432}
433
434#ifndef ACTUAL_NR_IRQS
435# define ACTUAL_NR_IRQS nr_irqs
436#endif
437
438int show_interrupts(struct seq_file *p, void *v)
439{
440 static int prec;
441
442 unsigned long flags, any_count = 0;
443 int i = *(loff_t *) v, j;
444 struct irqaction *action;
445 struct irq_desc *desc;
446
447 if (i > ACTUAL_NR_IRQS)
448 return 0;
449
450 if (i == ACTUAL_NR_IRQS)
451 return arch_show_interrupts(p, prec);
452
453 /* print header and calculate the width of the first column */
454 if (i == 0) {
455 for (prec = 3, j = 1000; prec < 10 && j <= nr_irqs; ++prec)
456 j *= 10;
457
458 seq_printf(p, "%*s", prec + 8, "");
459 for_each_online_cpu(j)
460 seq_printf(p, "CPU%-8d", j);
461 seq_putc(p, '\n');
462 }
463
464 rcu_read_lock();
465 desc = irq_to_desc(i);
466 if (!desc)
467 goto outsparse;
468
469 if (desc->kstat_irqs)
470 for_each_online_cpu(j)
471 any_count |= *per_cpu_ptr(desc->kstat_irqs, j);
472
473 if ((!desc->action || irq_desc_is_chained(desc)) && !any_count)
474 goto outsparse;
475
476 seq_printf(p, "%*d: ", prec, i);
477 for_each_online_cpu(j)
478 seq_printf(p, "%10u ", desc->kstat_irqs ?
479 *per_cpu_ptr(desc->kstat_irqs, j) : 0);
480
481 raw_spin_lock_irqsave(&desc->lock, flags);
482 if (desc->irq_data.chip) {
483 if (desc->irq_data.chip->irq_print_chip)
484 desc->irq_data.chip->irq_print_chip(&desc->irq_data, p);
485 else if (desc->irq_data.chip->name)
486 seq_printf(p, " %8s", desc->irq_data.chip->name);
487 else
488 seq_printf(p, " %8s", "-");
489 } else {
490 seq_printf(p, " %8s", "None");
491 }
492 if (desc->irq_data.domain)
493 seq_printf(p, " %*d", prec, (int) desc->irq_data.hwirq);
494 else
495 seq_printf(p, " %*s", prec, "");
496#ifdef CONFIG_GENERIC_IRQ_SHOW_LEVEL
497 seq_printf(p, " %-8s", irqd_is_level_type(&desc->irq_data) ? "Level" : "Edge");
498#endif
499 if (desc->name)
500 seq_printf(p, "-%-8s", desc->name);
501
502 action = desc->action;
503 if (action) {
504 seq_printf(p, " %s", action->name);
505 while ((action = action->next) != NULL)
506 seq_printf(p, ", %s", action->name);
507 }
508
509 seq_putc(p, '\n');
510 raw_spin_unlock_irqrestore(&desc->lock, flags);
511outsparse:
512 rcu_read_unlock();
513 return 0;
514}
515#endif
1/*
2 * linux/kernel/irq/proc.c
3 *
4 * Copyright (C) 1992, 1998-2004 Linus Torvalds, Ingo Molnar
5 *
6 * This file contains the /proc/irq/ handling code.
7 */
8
9#include <linux/irq.h>
10#include <linux/gfp.h>
11#include <linux/proc_fs.h>
12#include <linux/seq_file.h>
13#include <linux/interrupt.h>
14#include <linux/kernel_stat.h>
15#include <linux/mutex.h>
16
17#include "internals.h"
18
19/*
20 * Access rules:
21 *
22 * procfs protects read/write of /proc/irq/N/ files against a
23 * concurrent free of the interrupt descriptor. remove_proc_entry()
24 * immediately prevents new read/writes to happen and waits for
25 * already running read/write functions to complete.
26 *
27 * We remove the proc entries first and then delete the interrupt
28 * descriptor from the radix tree and free it. So it is guaranteed
29 * that irq_to_desc(N) is valid as long as the read/writes are
30 * permitted by procfs.
31 *
32 * The read from /proc/interrupts is a different problem because there
33 * is no protection. So the lookup and the access to irqdesc
34 * information must be protected by sparse_irq_lock.
35 */
36static struct proc_dir_entry *root_irq_dir;
37
38#ifdef CONFIG_SMP
39
40static int show_irq_affinity(int type, struct seq_file *m, void *v)
41{
42 struct irq_desc *desc = irq_to_desc((long)m->private);
43 const struct cpumask *mask = desc->irq_common_data.affinity;
44
45#ifdef CONFIG_GENERIC_PENDING_IRQ
46 if (irqd_is_setaffinity_pending(&desc->irq_data))
47 mask = desc->pending_mask;
48#endif
49 if (type)
50 seq_printf(m, "%*pbl\n", cpumask_pr_args(mask));
51 else
52 seq_printf(m, "%*pb\n", cpumask_pr_args(mask));
53 return 0;
54}
55
56static int irq_affinity_hint_proc_show(struct seq_file *m, void *v)
57{
58 struct irq_desc *desc = irq_to_desc((long)m->private);
59 unsigned long flags;
60 cpumask_var_t mask;
61
62 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
63 return -ENOMEM;
64
65 raw_spin_lock_irqsave(&desc->lock, flags);
66 if (desc->affinity_hint)
67 cpumask_copy(mask, desc->affinity_hint);
68 raw_spin_unlock_irqrestore(&desc->lock, flags);
69
70 seq_printf(m, "%*pb\n", cpumask_pr_args(mask));
71 free_cpumask_var(mask);
72
73 return 0;
74}
75
76#ifndef is_affinity_mask_valid
77#define is_affinity_mask_valid(val) 1
78#endif
79
80int no_irq_affinity;
81static int irq_affinity_proc_show(struct seq_file *m, void *v)
82{
83 return show_irq_affinity(0, m, v);
84}
85
86static int irq_affinity_list_proc_show(struct seq_file *m, void *v)
87{
88 return show_irq_affinity(1, m, v);
89}
90
91
92static ssize_t write_irq_affinity(int type, struct file *file,
93 const char __user *buffer, size_t count, loff_t *pos)
94{
95 unsigned int irq = (int)(long)PDE_DATA(file_inode(file));
96 cpumask_var_t new_value;
97 int err;
98
99 if (!irq_can_set_affinity_usr(irq) || no_irq_affinity)
100 return -EIO;
101
102 if (!alloc_cpumask_var(&new_value, GFP_KERNEL))
103 return -ENOMEM;
104
105 if (type)
106 err = cpumask_parselist_user(buffer, count, new_value);
107 else
108 err = cpumask_parse_user(buffer, count, new_value);
109 if (err)
110 goto free_cpumask;
111
112 if (!is_affinity_mask_valid(new_value)) {
113 err = -EINVAL;
114 goto free_cpumask;
115 }
116
117 /*
118 * Do not allow disabling IRQs completely - it's a too easy
119 * way to make the system unusable accidentally :-) At least
120 * one online CPU still has to be targeted.
121 */
122 if (!cpumask_intersects(new_value, cpu_online_mask)) {
123 /* Special case for empty set - allow the architecture
124 code to set default SMP affinity. */
125 err = irq_select_affinity_usr(irq, new_value) ? -EINVAL : count;
126 } else {
127 irq_set_affinity(irq, new_value);
128 err = count;
129 }
130
131free_cpumask:
132 free_cpumask_var(new_value);
133 return err;
134}
135
136static ssize_t irq_affinity_proc_write(struct file *file,
137 const char __user *buffer, size_t count, loff_t *pos)
138{
139 return write_irq_affinity(0, file, buffer, count, pos);
140}
141
142static ssize_t irq_affinity_list_proc_write(struct file *file,
143 const char __user *buffer, size_t count, loff_t *pos)
144{
145 return write_irq_affinity(1, file, buffer, count, pos);
146}
147
148static int irq_affinity_proc_open(struct inode *inode, struct file *file)
149{
150 return single_open(file, irq_affinity_proc_show, PDE_DATA(inode));
151}
152
153static int irq_affinity_list_proc_open(struct inode *inode, struct file *file)
154{
155 return single_open(file, irq_affinity_list_proc_show, PDE_DATA(inode));
156}
157
158static int irq_affinity_hint_proc_open(struct inode *inode, struct file *file)
159{
160 return single_open(file, irq_affinity_hint_proc_show, PDE_DATA(inode));
161}
162
163static const struct file_operations irq_affinity_proc_fops = {
164 .open = irq_affinity_proc_open,
165 .read = seq_read,
166 .llseek = seq_lseek,
167 .release = single_release,
168 .write = irq_affinity_proc_write,
169};
170
171static const struct file_operations irq_affinity_hint_proc_fops = {
172 .open = irq_affinity_hint_proc_open,
173 .read = seq_read,
174 .llseek = seq_lseek,
175 .release = single_release,
176};
177
178static const struct file_operations irq_affinity_list_proc_fops = {
179 .open = irq_affinity_list_proc_open,
180 .read = seq_read,
181 .llseek = seq_lseek,
182 .release = single_release,
183 .write = irq_affinity_list_proc_write,
184};
185
186static int default_affinity_show(struct seq_file *m, void *v)
187{
188 seq_printf(m, "%*pb\n", cpumask_pr_args(irq_default_affinity));
189 return 0;
190}
191
192static ssize_t default_affinity_write(struct file *file,
193 const char __user *buffer, size_t count, loff_t *ppos)
194{
195 cpumask_var_t new_value;
196 int err;
197
198 if (!alloc_cpumask_var(&new_value, GFP_KERNEL))
199 return -ENOMEM;
200
201 err = cpumask_parse_user(buffer, count, new_value);
202 if (err)
203 goto out;
204
205 if (!is_affinity_mask_valid(new_value)) {
206 err = -EINVAL;
207 goto out;
208 }
209
210 /*
211 * Do not allow disabling IRQs completely - it's a too easy
212 * way to make the system unusable accidentally :-) At least
213 * one online CPU still has to be targeted.
214 */
215 if (!cpumask_intersects(new_value, cpu_online_mask)) {
216 err = -EINVAL;
217 goto out;
218 }
219
220 cpumask_copy(irq_default_affinity, new_value);
221 err = count;
222
223out:
224 free_cpumask_var(new_value);
225 return err;
226}
227
228static int default_affinity_open(struct inode *inode, struct file *file)
229{
230 return single_open(file, default_affinity_show, PDE_DATA(inode));
231}
232
233static const struct file_operations default_affinity_proc_fops = {
234 .open = default_affinity_open,
235 .read = seq_read,
236 .llseek = seq_lseek,
237 .release = single_release,
238 .write = default_affinity_write,
239};
240
241static int irq_node_proc_show(struct seq_file *m, void *v)
242{
243 struct irq_desc *desc = irq_to_desc((long) m->private);
244
245 seq_printf(m, "%d\n", irq_desc_get_node(desc));
246 return 0;
247}
248
249static int irq_node_proc_open(struct inode *inode, struct file *file)
250{
251 return single_open(file, irq_node_proc_show, PDE_DATA(inode));
252}
253
254static const struct file_operations irq_node_proc_fops = {
255 .open = irq_node_proc_open,
256 .read = seq_read,
257 .llseek = seq_lseek,
258 .release = single_release,
259};
260#endif
261
262static int irq_spurious_proc_show(struct seq_file *m, void *v)
263{
264 struct irq_desc *desc = irq_to_desc((long) m->private);
265
266 seq_printf(m, "count %u\n" "unhandled %u\n" "last_unhandled %u ms\n",
267 desc->irq_count, desc->irqs_unhandled,
268 jiffies_to_msecs(desc->last_unhandled));
269 return 0;
270}
271
272static int irq_spurious_proc_open(struct inode *inode, struct file *file)
273{
274 return single_open(file, irq_spurious_proc_show, PDE_DATA(inode));
275}
276
277static const struct file_operations irq_spurious_proc_fops = {
278 .open = irq_spurious_proc_open,
279 .read = seq_read,
280 .llseek = seq_lseek,
281 .release = single_release,
282};
283
284#define MAX_NAMELEN 128
285
286static int name_unique(unsigned int irq, struct irqaction *new_action)
287{
288 struct irq_desc *desc = irq_to_desc(irq);
289 struct irqaction *action;
290 unsigned long flags;
291 int ret = 1;
292
293 raw_spin_lock_irqsave(&desc->lock, flags);
294 for_each_action_of_desc(desc, action) {
295 if ((action != new_action) && action->name &&
296 !strcmp(new_action->name, action->name)) {
297 ret = 0;
298 break;
299 }
300 }
301 raw_spin_unlock_irqrestore(&desc->lock, flags);
302 return ret;
303}
304
305void register_handler_proc(unsigned int irq, struct irqaction *action)
306{
307 char name [MAX_NAMELEN];
308 struct irq_desc *desc = irq_to_desc(irq);
309
310 if (!desc->dir || action->dir || !action->name ||
311 !name_unique(irq, action))
312 return;
313
314 snprintf(name, MAX_NAMELEN, "%s", action->name);
315
316 /* create /proc/irq/1234/handler/ */
317 action->dir = proc_mkdir(name, desc->dir);
318}
319
320#undef MAX_NAMELEN
321
322#define MAX_NAMELEN 10
323
324void register_irq_proc(unsigned int irq, struct irq_desc *desc)
325{
326 static DEFINE_MUTEX(register_lock);
327 char name [MAX_NAMELEN];
328
329 if (!root_irq_dir || (desc->irq_data.chip == &no_irq_chip))
330 return;
331
332 /*
333 * irq directories are registered only when a handler is
334 * added, not when the descriptor is created, so multiple
335 * tasks might try to register at the same time.
336 */
337 mutex_lock(®ister_lock);
338
339 if (desc->dir)
340 goto out_unlock;
341
342 sprintf(name, "%d", irq);
343
344 /* create /proc/irq/1234 */
345 desc->dir = proc_mkdir(name, root_irq_dir);
346 if (!desc->dir)
347 goto out_unlock;
348
349#ifdef CONFIG_SMP
350 /* create /proc/irq/<irq>/smp_affinity */
351 proc_create_data("smp_affinity", 0644, desc->dir,
352 &irq_affinity_proc_fops, (void *)(long)irq);
353
354 /* create /proc/irq/<irq>/affinity_hint */
355 proc_create_data("affinity_hint", 0444, desc->dir,
356 &irq_affinity_hint_proc_fops, (void *)(long)irq);
357
358 /* create /proc/irq/<irq>/smp_affinity_list */
359 proc_create_data("smp_affinity_list", 0644, desc->dir,
360 &irq_affinity_list_proc_fops, (void *)(long)irq);
361
362 proc_create_data("node", 0444, desc->dir,
363 &irq_node_proc_fops, (void *)(long)irq);
364#endif
365
366 proc_create_data("spurious", 0444, desc->dir,
367 &irq_spurious_proc_fops, (void *)(long)irq);
368
369out_unlock:
370 mutex_unlock(®ister_lock);
371}
372
373void unregister_irq_proc(unsigned int irq, struct irq_desc *desc)
374{
375 char name [MAX_NAMELEN];
376
377 if (!root_irq_dir || !desc->dir)
378 return;
379#ifdef CONFIG_SMP
380 remove_proc_entry("smp_affinity", desc->dir);
381 remove_proc_entry("affinity_hint", desc->dir);
382 remove_proc_entry("smp_affinity_list", desc->dir);
383 remove_proc_entry("node", desc->dir);
384#endif
385 remove_proc_entry("spurious", desc->dir);
386
387 sprintf(name, "%u", irq);
388 remove_proc_entry(name, root_irq_dir);
389}
390
391#undef MAX_NAMELEN
392
393void unregister_handler_proc(unsigned int irq, struct irqaction *action)
394{
395 proc_remove(action->dir);
396}
397
398static void register_default_affinity_proc(void)
399{
400#ifdef CONFIG_SMP
401 proc_create("irq/default_smp_affinity", 0644, NULL,
402 &default_affinity_proc_fops);
403#endif
404}
405
406void init_irq_proc(void)
407{
408 unsigned int irq;
409 struct irq_desc *desc;
410
411 /* create /proc/irq */
412 root_irq_dir = proc_mkdir("irq", NULL);
413 if (!root_irq_dir)
414 return;
415
416 register_default_affinity_proc();
417
418 /*
419 * Create entries for all existing IRQs.
420 */
421 for_each_irq_desc(irq, desc)
422 register_irq_proc(irq, desc);
423}
424
425#ifdef CONFIG_GENERIC_IRQ_SHOW
426
427int __weak arch_show_interrupts(struct seq_file *p, int prec)
428{
429 return 0;
430}
431
432#ifndef ACTUAL_NR_IRQS
433# define ACTUAL_NR_IRQS nr_irqs
434#endif
435
436int show_interrupts(struct seq_file *p, void *v)
437{
438 static int prec;
439
440 unsigned long flags, any_count = 0;
441 int i = *(loff_t *) v, j;
442 struct irqaction *action;
443 struct irq_desc *desc;
444
445 if (i > ACTUAL_NR_IRQS)
446 return 0;
447
448 if (i == ACTUAL_NR_IRQS)
449 return arch_show_interrupts(p, prec);
450
451 /* print header and calculate the width of the first column */
452 if (i == 0) {
453 for (prec = 3, j = 1000; prec < 10 && j <= nr_irqs; ++prec)
454 j *= 10;
455
456 seq_printf(p, "%*s", prec + 8, "");
457 for_each_online_cpu(j)
458 seq_printf(p, "CPU%-8d", j);
459 seq_putc(p, '\n');
460 }
461
462 irq_lock_sparse();
463 desc = irq_to_desc(i);
464 if (!desc)
465 goto outsparse;
466
467 raw_spin_lock_irqsave(&desc->lock, flags);
468 for_each_online_cpu(j)
469 any_count |= kstat_irqs_cpu(i, j);
470 action = desc->action;
471 if ((!action || irq_desc_is_chained(desc)) && !any_count)
472 goto out;
473
474 seq_printf(p, "%*d: ", prec, i);
475 for_each_online_cpu(j)
476 seq_printf(p, "%10u ", kstat_irqs_cpu(i, j));
477
478 if (desc->irq_data.chip) {
479 if (desc->irq_data.chip->irq_print_chip)
480 desc->irq_data.chip->irq_print_chip(&desc->irq_data, p);
481 else if (desc->irq_data.chip->name)
482 seq_printf(p, " %8s", desc->irq_data.chip->name);
483 else
484 seq_printf(p, " %8s", "-");
485 } else {
486 seq_printf(p, " %8s", "None");
487 }
488 if (desc->irq_data.domain)
489 seq_printf(p, " %*d", prec, (int) desc->irq_data.hwirq);
490#ifdef CONFIG_GENERIC_IRQ_SHOW_LEVEL
491 seq_printf(p, " %-8s", irqd_is_level_type(&desc->irq_data) ? "Level" : "Edge");
492#endif
493 if (desc->name)
494 seq_printf(p, "-%-8s", desc->name);
495
496 if (action) {
497 seq_printf(p, " %s", action->name);
498 while ((action = action->next) != NULL)
499 seq_printf(p, ", %s", action->name);
500 }
501
502 seq_putc(p, '\n');
503out:
504 raw_spin_unlock_irqrestore(&desc->lock, flags);
505outsparse:
506 irq_unlock_sparse();
507 return 0;
508}
509#endif