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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(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 memset(name, 0, MAX_NAMELEN);
315 snprintf(name, MAX_NAMELEN, "%s", action->name);
316
317 /* create /proc/irq/1234/handler/ */
318 action->dir = proc_mkdir(name, desc->dir);
319}
320
321#undef MAX_NAMELEN
322
323#define MAX_NAMELEN 10
324
325void register_irq_proc(unsigned int irq, struct irq_desc *desc)
326{
327 static DEFINE_MUTEX(register_lock);
328 char name [MAX_NAMELEN];
329
330 if (!root_irq_dir || (desc->irq_data.chip == &no_irq_chip))
331 return;
332
333 /*
334 * irq directories are registered only when a handler is
335 * added, not when the descriptor is created, so multiple
336 * tasks might try to register at the same time.
337 */
338 mutex_lock(®ister_lock);
339
340 if (desc->dir)
341 goto out_unlock;
342
343 memset(name, 0, MAX_NAMELEN);
344 sprintf(name, "%d", irq);
345
346 /* create /proc/irq/1234 */
347 desc->dir = proc_mkdir(name, root_irq_dir);
348 if (!desc->dir)
349 goto out_unlock;
350
351#ifdef CONFIG_SMP
352 /* create /proc/irq/<irq>/smp_affinity */
353 proc_create_data("smp_affinity", 0644, desc->dir,
354 &irq_affinity_proc_fops, (void *)(long)irq);
355
356 /* create /proc/irq/<irq>/affinity_hint */
357 proc_create_data("affinity_hint", 0444, desc->dir,
358 &irq_affinity_hint_proc_fops, (void *)(long)irq);
359
360 /* create /proc/irq/<irq>/smp_affinity_list */
361 proc_create_data("smp_affinity_list", 0644, desc->dir,
362 &irq_affinity_list_proc_fops, (void *)(long)irq);
363
364 proc_create_data("node", 0444, desc->dir,
365 &irq_node_proc_fops, (void *)(long)irq);
366#endif
367
368 proc_create_data("spurious", 0444, desc->dir,
369 &irq_spurious_proc_fops, (void *)(long)irq);
370
371out_unlock:
372 mutex_unlock(®ister_lock);
373}
374
375void unregister_irq_proc(unsigned int irq, struct irq_desc *desc)
376{
377 char name [MAX_NAMELEN];
378
379 if (!root_irq_dir || !desc->dir)
380 return;
381#ifdef CONFIG_SMP
382 remove_proc_entry("smp_affinity", desc->dir);
383 remove_proc_entry("affinity_hint", desc->dir);
384 remove_proc_entry("smp_affinity_list", desc->dir);
385 remove_proc_entry("node", desc->dir);
386#endif
387 remove_proc_entry("spurious", desc->dir);
388
389 memset(name, 0, MAX_NAMELEN);
390 sprintf(name, "%u", irq);
391 remove_proc_entry(name, root_irq_dir);
392}
393
394#undef MAX_NAMELEN
395
396void unregister_handler_proc(unsigned int irq, struct irqaction *action)
397{
398 proc_remove(action->dir);
399}
400
401static void register_default_affinity_proc(void)
402{
403#ifdef CONFIG_SMP
404 proc_create("irq/default_smp_affinity", 0644, NULL,
405 &default_affinity_proc_fops);
406#endif
407}
408
409void init_irq_proc(void)
410{
411 unsigned int irq;
412 struct irq_desc *desc;
413
414 /* create /proc/irq */
415 root_irq_dir = proc_mkdir("irq", NULL);
416 if (!root_irq_dir)
417 return;
418
419 register_default_affinity_proc();
420
421 /*
422 * Create entries for all existing IRQs.
423 */
424 for_each_irq_desc(irq, desc) {
425 if (!desc)
426 continue;
427
428 register_irq_proc(irq, desc);
429 }
430}
431
432#ifdef CONFIG_GENERIC_IRQ_SHOW
433
434int __weak arch_show_interrupts(struct seq_file *p, int prec)
435{
436 return 0;
437}
438
439#ifndef ACTUAL_NR_IRQS
440# define ACTUAL_NR_IRQS nr_irqs
441#endif
442
443int show_interrupts(struct seq_file *p, void *v)
444{
445 static int prec;
446
447 unsigned long flags, any_count = 0;
448 int i = *(loff_t *) v, j;
449 struct irqaction *action;
450 struct irq_desc *desc;
451
452 if (i > ACTUAL_NR_IRQS)
453 return 0;
454
455 if (i == ACTUAL_NR_IRQS)
456 return arch_show_interrupts(p, prec);
457
458 /* print header and calculate the width of the first column */
459 if (i == 0) {
460 for (prec = 3, j = 1000; prec < 10 && j <= nr_irqs; ++prec)
461 j *= 10;
462
463 seq_printf(p, "%*s", prec + 8, "");
464 for_each_online_cpu(j)
465 seq_printf(p, "CPU%-8d", j);
466 seq_putc(p, '\n');
467 }
468
469 irq_lock_sparse();
470 desc = irq_to_desc(i);
471 if (!desc)
472 goto outsparse;
473
474 raw_spin_lock_irqsave(&desc->lock, flags);
475 for_each_online_cpu(j)
476 any_count |= kstat_irqs_cpu(i, j);
477 action = desc->action;
478 if ((!action || irq_desc_is_chained(desc)) && !any_count)
479 goto out;
480
481 seq_printf(p, "%*d: ", prec, i);
482 for_each_online_cpu(j)
483 seq_printf(p, "%10u ", kstat_irqs_cpu(i, j));
484
485 if (desc->irq_data.chip) {
486 if (desc->irq_data.chip->irq_print_chip)
487 desc->irq_data.chip->irq_print_chip(&desc->irq_data, p);
488 else if (desc->irq_data.chip->name)
489 seq_printf(p, " %8s", desc->irq_data.chip->name);
490 else
491 seq_printf(p, " %8s", "-");
492 } else {
493 seq_printf(p, " %8s", "None");
494 }
495 if (desc->irq_data.domain)
496 seq_printf(p, " %*d", prec, (int) desc->irq_data.hwirq);
497#ifdef CONFIG_GENERIC_IRQ_SHOW_LEVEL
498 seq_printf(p, " %-8s", irqd_is_level_type(&desc->irq_data) ? "Level" : "Edge");
499#endif
500 if (desc->name)
501 seq_printf(p, "-%-8s", desc->name);
502
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');
510out:
511 raw_spin_unlock_irqrestore(&desc->lock, flags);
512outsparse:
513 irq_unlock_sparse();
514 return 0;
515}
516#endif
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
103#ifndef is_affinity_mask_valid
104#define is_affinity_mask_valid(val) 1
105#endif
106
107int no_irq_affinity;
108static int irq_affinity_proc_show(struct seq_file *m, void *v)
109{
110 return show_irq_affinity(AFFINITY, m);
111}
112
113static int irq_affinity_list_proc_show(struct seq_file *m, void *v)
114{
115 return show_irq_affinity(AFFINITY_LIST, m);
116}
117
118
119static ssize_t write_irq_affinity(int type, struct file *file,
120 const char __user *buffer, size_t count, loff_t *pos)
121{
122 unsigned int irq = (int)(long)PDE_DATA(file_inode(file));
123 cpumask_var_t new_value;
124 int err;
125
126 if (!irq_can_set_affinity_usr(irq) || no_irq_affinity)
127 return -EIO;
128
129 if (!alloc_cpumask_var(&new_value, GFP_KERNEL))
130 return -ENOMEM;
131
132 if (type)
133 err = cpumask_parselist_user(buffer, count, new_value);
134 else
135 err = cpumask_parse_user(buffer, count, new_value);
136 if (err)
137 goto free_cpumask;
138
139 if (!is_affinity_mask_valid(new_value)) {
140 err = -EINVAL;
141 goto free_cpumask;
142 }
143
144 /*
145 * Do not allow disabling IRQs completely - it's a too easy
146 * way to make the system unusable accidentally :-) At least
147 * one online CPU still has to be targeted.
148 */
149 if (!cpumask_intersects(new_value, cpu_online_mask)) {
150 /*
151 * Special case for empty set - allow the architecture code
152 * to set default SMP affinity.
153 */
154 err = irq_select_affinity_usr(irq) ? -EINVAL : count;
155 } else {
156 err = irq_set_affinity(irq, new_value);
157 if (!err)
158 err = count;
159 }
160
161free_cpumask:
162 free_cpumask_var(new_value);
163 return err;
164}
165
166static ssize_t irq_affinity_proc_write(struct file *file,
167 const char __user *buffer, size_t count, loff_t *pos)
168{
169 return write_irq_affinity(0, file, buffer, count, pos);
170}
171
172static ssize_t irq_affinity_list_proc_write(struct file *file,
173 const char __user *buffer, size_t count, loff_t *pos)
174{
175 return write_irq_affinity(1, file, buffer, count, pos);
176}
177
178static int irq_affinity_proc_open(struct inode *inode, struct file *file)
179{
180 return single_open(file, irq_affinity_proc_show, PDE_DATA(inode));
181}
182
183static int irq_affinity_list_proc_open(struct inode *inode, struct file *file)
184{
185 return single_open(file, irq_affinity_list_proc_show, PDE_DATA(inode));
186}
187
188static int irq_affinity_hint_proc_open(struct inode *inode, struct file *file)
189{
190 return single_open(file, irq_affinity_hint_proc_show, PDE_DATA(inode));
191}
192
193static const struct file_operations irq_affinity_proc_fops = {
194 .open = irq_affinity_proc_open,
195 .read = seq_read,
196 .llseek = seq_lseek,
197 .release = single_release,
198 .write = irq_affinity_proc_write,
199};
200
201static const struct file_operations irq_affinity_hint_proc_fops = {
202 .open = irq_affinity_hint_proc_open,
203 .read = seq_read,
204 .llseek = seq_lseek,
205 .release = single_release,
206};
207
208static const struct file_operations irq_affinity_list_proc_fops = {
209 .open = irq_affinity_list_proc_open,
210 .read = seq_read,
211 .llseek = seq_lseek,
212 .release = single_release,
213 .write = irq_affinity_list_proc_write,
214};
215
216#ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK
217static int irq_effective_aff_proc_show(struct seq_file *m, void *v)
218{
219 return show_irq_affinity(EFFECTIVE, m);
220}
221
222static int irq_effective_aff_list_proc_show(struct seq_file *m, void *v)
223{
224 return show_irq_affinity(EFFECTIVE_LIST, m);
225}
226
227static int irq_effective_aff_proc_open(struct inode *inode, struct file *file)
228{
229 return single_open(file, irq_effective_aff_proc_show, PDE_DATA(inode));
230}
231
232static int irq_effective_aff_list_proc_open(struct inode *inode,
233 struct file *file)
234{
235 return single_open(file, irq_effective_aff_list_proc_show,
236 PDE_DATA(inode));
237}
238
239static const struct file_operations irq_effective_aff_proc_fops = {
240 .open = irq_effective_aff_proc_open,
241 .read = seq_read,
242 .llseek = seq_lseek,
243 .release = single_release,
244};
245
246static const struct file_operations irq_effective_aff_list_proc_fops = {
247 .open = irq_effective_aff_list_proc_open,
248 .read = seq_read,
249 .llseek = seq_lseek,
250 .release = single_release,
251};
252#endif
253
254static int default_affinity_show(struct seq_file *m, void *v)
255{
256 seq_printf(m, "%*pb\n", cpumask_pr_args(irq_default_affinity));
257 return 0;
258}
259
260static ssize_t default_affinity_write(struct file *file,
261 const char __user *buffer, size_t count, loff_t *ppos)
262{
263 cpumask_var_t new_value;
264 int err;
265
266 if (!alloc_cpumask_var(&new_value, GFP_KERNEL))
267 return -ENOMEM;
268
269 err = cpumask_parse_user(buffer, count, new_value);
270 if (err)
271 goto out;
272
273 if (!is_affinity_mask_valid(new_value)) {
274 err = -EINVAL;
275 goto out;
276 }
277
278 /*
279 * Do not allow disabling IRQs completely - it's a too easy
280 * way to make the system unusable accidentally :-) At least
281 * one online CPU still has to be targeted.
282 */
283 if (!cpumask_intersects(new_value, cpu_online_mask)) {
284 err = -EINVAL;
285 goto out;
286 }
287
288 cpumask_copy(irq_default_affinity, new_value);
289 err = count;
290
291out:
292 free_cpumask_var(new_value);
293 return err;
294}
295
296static int default_affinity_open(struct inode *inode, struct file *file)
297{
298 return single_open(file, default_affinity_show, PDE_DATA(inode));
299}
300
301static const struct file_operations default_affinity_proc_fops = {
302 .open = default_affinity_open,
303 .read = seq_read,
304 .llseek = seq_lseek,
305 .release = single_release,
306 .write = default_affinity_write,
307};
308
309static int irq_node_proc_show(struct seq_file *m, void *v)
310{
311 struct irq_desc *desc = irq_to_desc((long) m->private);
312
313 seq_printf(m, "%d\n", irq_desc_get_node(desc));
314 return 0;
315}
316
317static int irq_node_proc_open(struct inode *inode, struct file *file)
318{
319 return single_open(file, irq_node_proc_show, PDE_DATA(inode));
320}
321
322static const struct file_operations irq_node_proc_fops = {
323 .open = irq_node_proc_open,
324 .read = seq_read,
325 .llseek = seq_lseek,
326 .release = single_release,
327};
328#endif
329
330static int irq_spurious_proc_show(struct seq_file *m, void *v)
331{
332 struct irq_desc *desc = irq_to_desc((long) m->private);
333
334 seq_printf(m, "count %u\n" "unhandled %u\n" "last_unhandled %u ms\n",
335 desc->irq_count, desc->irqs_unhandled,
336 jiffies_to_msecs(desc->last_unhandled));
337 return 0;
338}
339
340static int irq_spurious_proc_open(struct inode *inode, struct file *file)
341{
342 return single_open(file, irq_spurious_proc_show, PDE_DATA(inode));
343}
344
345static const struct file_operations irq_spurious_proc_fops = {
346 .open = irq_spurious_proc_open,
347 .read = seq_read,
348 .llseek = seq_lseek,
349 .release = single_release,
350};
351
352#define MAX_NAMELEN 128
353
354static int name_unique(unsigned int irq, struct irqaction *new_action)
355{
356 struct irq_desc *desc = irq_to_desc(irq);
357 struct irqaction *action;
358 unsigned long flags;
359 int ret = 1;
360
361 raw_spin_lock_irqsave(&desc->lock, flags);
362 for_each_action_of_desc(desc, action) {
363 if ((action != new_action) && action->name &&
364 !strcmp(new_action->name, action->name)) {
365 ret = 0;
366 break;
367 }
368 }
369 raw_spin_unlock_irqrestore(&desc->lock, flags);
370 return ret;
371}
372
373void register_handler_proc(unsigned int irq, struct irqaction *action)
374{
375 char name [MAX_NAMELEN];
376 struct irq_desc *desc = irq_to_desc(irq);
377
378 if (!desc->dir || action->dir || !action->name ||
379 !name_unique(irq, action))
380 return;
381
382 snprintf(name, MAX_NAMELEN, "%s", action->name);
383
384 /* create /proc/irq/1234/handler/ */
385 action->dir = proc_mkdir(name, desc->dir);
386}
387
388#undef MAX_NAMELEN
389
390#define MAX_NAMELEN 10
391
392void register_irq_proc(unsigned int irq, struct irq_desc *desc)
393{
394 static DEFINE_MUTEX(register_lock);
395 void __maybe_unused *irqp = (void *)(unsigned long) irq;
396 char name [MAX_NAMELEN];
397
398 if (!root_irq_dir || (desc->irq_data.chip == &no_irq_chip))
399 return;
400
401 /*
402 * irq directories are registered only when a handler is
403 * added, not when the descriptor is created, so multiple
404 * tasks might try to register at the same time.
405 */
406 mutex_lock(®ister_lock);
407
408 if (desc->dir)
409 goto out_unlock;
410
411 sprintf(name, "%d", irq);
412
413 /* create /proc/irq/1234 */
414 desc->dir = proc_mkdir(name, root_irq_dir);
415 if (!desc->dir)
416 goto out_unlock;
417
418#ifdef CONFIG_SMP
419 /* create /proc/irq/<irq>/smp_affinity */
420 proc_create_data("smp_affinity", 0644, desc->dir,
421 &irq_affinity_proc_fops, irqp);
422
423 /* create /proc/irq/<irq>/affinity_hint */
424 proc_create_data("affinity_hint", 0444, desc->dir,
425 &irq_affinity_hint_proc_fops, irqp);
426
427 /* create /proc/irq/<irq>/smp_affinity_list */
428 proc_create_data("smp_affinity_list", 0644, desc->dir,
429 &irq_affinity_list_proc_fops, irqp);
430
431 proc_create_data("node", 0444, desc->dir,
432 &irq_node_proc_fops, irqp);
433# ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK
434 proc_create_data("effective_affinity", 0444, desc->dir,
435 &irq_effective_aff_proc_fops, irqp);
436 proc_create_data("effective_affinity_list", 0444, desc->dir,
437 &irq_effective_aff_list_proc_fops, irqp);
438# endif
439#endif
440 proc_create_data("spurious", 0444, desc->dir,
441 &irq_spurious_proc_fops, (void *)(long)irq);
442
443out_unlock:
444 mutex_unlock(®ister_lock);
445}
446
447void unregister_irq_proc(unsigned int irq, struct irq_desc *desc)
448{
449 char name [MAX_NAMELEN];
450
451 if (!root_irq_dir || !desc->dir)
452 return;
453#ifdef CONFIG_SMP
454 remove_proc_entry("smp_affinity", desc->dir);
455 remove_proc_entry("affinity_hint", desc->dir);
456 remove_proc_entry("smp_affinity_list", desc->dir);
457 remove_proc_entry("node", desc->dir);
458# ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK
459 remove_proc_entry("effective_affinity", desc->dir);
460 remove_proc_entry("effective_affinity_list", desc->dir);
461# endif
462#endif
463 remove_proc_entry("spurious", desc->dir);
464
465 sprintf(name, "%u", irq);
466 remove_proc_entry(name, root_irq_dir);
467}
468
469#undef MAX_NAMELEN
470
471void unregister_handler_proc(unsigned int irq, struct irqaction *action)
472{
473 proc_remove(action->dir);
474}
475
476static void register_default_affinity_proc(void)
477{
478#ifdef CONFIG_SMP
479 proc_create("irq/default_smp_affinity", 0644, NULL,
480 &default_affinity_proc_fops);
481#endif
482}
483
484void init_irq_proc(void)
485{
486 unsigned int irq;
487 struct irq_desc *desc;
488
489 /* create /proc/irq */
490 root_irq_dir = proc_mkdir("irq", NULL);
491 if (!root_irq_dir)
492 return;
493
494 register_default_affinity_proc();
495
496 /*
497 * Create entries for all existing IRQs.
498 */
499 for_each_irq_desc(irq, desc)
500 register_irq_proc(irq, desc);
501}
502
503#ifdef CONFIG_GENERIC_IRQ_SHOW
504
505int __weak arch_show_interrupts(struct seq_file *p, int prec)
506{
507 return 0;
508}
509
510#ifndef ACTUAL_NR_IRQS
511# define ACTUAL_NR_IRQS nr_irqs
512#endif
513
514int show_interrupts(struct seq_file *p, void *v)
515{
516 static int prec;
517
518 unsigned long flags, any_count = 0;
519 int i = *(loff_t *) v, j;
520 struct irqaction *action;
521 struct irq_desc *desc;
522
523 if (i > ACTUAL_NR_IRQS)
524 return 0;
525
526 if (i == ACTUAL_NR_IRQS)
527 return arch_show_interrupts(p, prec);
528
529 /* print header and calculate the width of the first column */
530 if (i == 0) {
531 for (prec = 3, j = 1000; prec < 10 && j <= nr_irqs; ++prec)
532 j *= 10;
533
534 seq_printf(p, "%*s", prec + 8, "");
535 for_each_online_cpu(j)
536 seq_printf(p, "CPU%-8d", j);
537 seq_putc(p, '\n');
538 }
539
540 irq_lock_sparse();
541 desc = irq_to_desc(i);
542 if (!desc)
543 goto outsparse;
544
545 raw_spin_lock_irqsave(&desc->lock, flags);
546 for_each_online_cpu(j)
547 any_count |= kstat_irqs_cpu(i, j);
548 action = desc->action;
549 if ((!action || irq_desc_is_chained(desc)) && !any_count)
550 goto out;
551
552 seq_printf(p, "%*d: ", prec, i);
553 for_each_online_cpu(j)
554 seq_printf(p, "%10u ", kstat_irqs_cpu(i, j));
555
556 if (desc->irq_data.chip) {
557 if (desc->irq_data.chip->irq_print_chip)
558 desc->irq_data.chip->irq_print_chip(&desc->irq_data, p);
559 else if (desc->irq_data.chip->name)
560 seq_printf(p, " %8s", desc->irq_data.chip->name);
561 else
562 seq_printf(p, " %8s", "-");
563 } else {
564 seq_printf(p, " %8s", "None");
565 }
566 if (desc->irq_data.domain)
567 seq_printf(p, " %*d", prec, (int) desc->irq_data.hwirq);
568 else
569 seq_printf(p, " %*s", prec, "");
570#ifdef CONFIG_GENERIC_IRQ_SHOW_LEVEL
571 seq_printf(p, " %-8s", irqd_is_level_type(&desc->irq_data) ? "Level" : "Edge");
572#endif
573 if (desc->name)
574 seq_printf(p, "-%-8s", desc->name);
575
576 if (action) {
577 seq_printf(p, " %s", action->name);
578 while ((action = action->next) != NULL)
579 seq_printf(p, ", %s", action->name);
580 }
581
582 seq_putc(p, '\n');
583out:
584 raw_spin_unlock_irqrestore(&desc->lock, flags);
585outsparse:
586 irq_unlock_sparse();
587 return 0;
588}
589#endif