Commit | Line | Data |
---|---|---|
1da177e4 LT |
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> | |
5a0e3ad6 | 10 | #include <linux/gfp.h> |
1da177e4 | 11 | #include <linux/proc_fs.h> |
f18e439d | 12 | #include <linux/seq_file.h> |
1da177e4 | 13 | #include <linux/interrupt.h> |
c78b9b65 | 14 | #include <linux/kernel_stat.h> |
95c2b175 | 15 | #include <linux/mutex.h> |
1da177e4 | 16 | |
97a41e26 AB |
17 | #include "internals.h" |
18 | ||
c291ee62 TG |
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 | */ | |
4a733ee1 | 36 | static struct proc_dir_entry *root_irq_dir; |
1da177e4 LT |
37 | |
38 | #ifdef CONFIG_SMP | |
39 | ||
4b060420 | 40 | static int show_irq_affinity(int type, struct seq_file *m, void *v) |
1da177e4 | 41 | { |
08678b08 | 42 | struct irq_desc *desc = irq_to_desc((long)m->private); |
9df872fa | 43 | const struct cpumask *mask = desc->irq_common_data.affinity; |
42ee2b74 AK |
44 | |
45 | #ifdef CONFIG_GENERIC_PENDING_IRQ | |
f230b6d5 | 46 | if (irqd_is_setaffinity_pending(&desc->irq_data)) |
7f7ace0c | 47 | mask = desc->pending_mask; |
42ee2b74 | 48 | #endif |
4b060420 | 49 | if (type) |
c1d7f03f | 50 | seq_printf(m, "%*pbl\n", cpumask_pr_args(mask)); |
4b060420 | 51 | else |
c1d7f03f | 52 | seq_printf(m, "%*pb\n", cpumask_pr_args(mask)); |
f18e439d | 53 | return 0; |
1da177e4 LT |
54 | } |
55 | ||
e7a297b0 PWJ |
56 | static 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 | ||
4308ad80 | 62 | if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) |
e7a297b0 PWJ |
63 | return -ENOMEM; |
64 | ||
65 | raw_spin_lock_irqsave(&desc->lock, flags); | |
66 | if (desc->affinity_hint) | |
67 | cpumask_copy(mask, desc->affinity_hint); | |
e7a297b0 PWJ |
68 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
69 | ||
c1d7f03f | 70 | seq_printf(m, "%*pb\n", cpumask_pr_args(mask)); |
e7a297b0 PWJ |
71 | free_cpumask_var(mask); |
72 | ||
73 | return 0; | |
74 | } | |
75 | ||
25d61578 JK |
76 | #ifndef is_affinity_mask_valid |
77 | #define is_affinity_mask_valid(val) 1 | |
78 | #endif | |
79 | ||
1da177e4 | 80 | int no_irq_affinity; |
4b060420 MT |
81 | static int irq_affinity_proc_show(struct seq_file *m, void *v) |
82 | { | |
83 | return show_irq_affinity(0, m, v); | |
84 | } | |
85 | ||
86 | static int irq_affinity_list_proc_show(struct seq_file *m, void *v) | |
87 | { | |
88 | return show_irq_affinity(1, m, v); | |
89 | } | |
90 | ||
91 | ||
92 | static ssize_t write_irq_affinity(int type, struct file *file, | |
f18e439d | 93 | const char __user *buffer, size_t count, loff_t *pos) |
1da177e4 | 94 | { |
d9dda78b | 95 | unsigned int irq = (int)(long)PDE_DATA(file_inode(file)); |
0de26520 | 96 | cpumask_var_t new_value; |
f18e439d | 97 | int err; |
1da177e4 | 98 | |
9c255583 | 99 | if (!irq_can_set_affinity_usr(irq) || no_irq_affinity) |
1da177e4 LT |
100 | return -EIO; |
101 | ||
0de26520 RR |
102 | if (!alloc_cpumask_var(&new_value, GFP_KERNEL)) |
103 | return -ENOMEM; | |
104 | ||
4b060420 MT |
105 | if (type) |
106 | err = cpumask_parselist_user(buffer, count, new_value); | |
107 | else | |
108 | err = cpumask_parse_user(buffer, count, new_value); | |
1da177e4 | 109 | if (err) |
0de26520 | 110 | goto free_cpumask; |
1da177e4 | 111 | |
6bdf197b | 112 | if (!is_affinity_mask_valid(new_value)) { |
0de26520 RR |
113 | err = -EINVAL; |
114 | goto free_cpumask; | |
115 | } | |
25d61578 | 116 | |
1da177e4 LT |
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 | */ | |
0de26520 | 122 | if (!cpumask_intersects(new_value, cpu_online_mask)) { |
eee45269 IK |
123 | /* Special case for empty set - allow the architecture |
124 | code to set default SMP affinity. */ | |
3b8249e7 | 125 | err = irq_select_affinity_usr(irq, new_value) ? -EINVAL : count; |
0de26520 RR |
126 | } else { |
127 | irq_set_affinity(irq, new_value); | |
128 | err = count; | |
129 | } | |
130 | ||
131 | free_cpumask: | |
132 | free_cpumask_var(new_value); | |
133 | return err; | |
1da177e4 LT |
134 | } |
135 | ||
4b060420 MT |
136 | static 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 | ||
142 | static 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 | ||
f18e439d | 148 | static int irq_affinity_proc_open(struct inode *inode, struct file *file) |
18404756 | 149 | { |
d9dda78b | 150 | return single_open(file, irq_affinity_proc_show, PDE_DATA(inode)); |
18404756 MK |
151 | } |
152 | ||
4b060420 MT |
153 | static int irq_affinity_list_proc_open(struct inode *inode, struct file *file) |
154 | { | |
d9dda78b | 155 | return single_open(file, irq_affinity_list_proc_show, PDE_DATA(inode)); |
4b060420 MT |
156 | } |
157 | ||
e7a297b0 PWJ |
158 | static int irq_affinity_hint_proc_open(struct inode *inode, struct file *file) |
159 | { | |
d9dda78b | 160 | return single_open(file, irq_affinity_hint_proc_show, PDE_DATA(inode)); |
e7a297b0 PWJ |
161 | } |
162 | ||
f18e439d AD |
163 | static 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 | ||
e7a297b0 PWJ |
171 | static 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 | ||
4b060420 MT |
178 | static 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 | ||
f18e439d AD |
186 | static int default_affinity_show(struct seq_file *m, void *v) |
187 | { | |
c1d7f03f | 188 | seq_printf(m, "%*pb\n", cpumask_pr_args(irq_default_affinity)); |
f18e439d AD |
189 | return 0; |
190 | } | |
191 | ||
192 | static ssize_t default_affinity_write(struct file *file, | |
193 | const char __user *buffer, size_t count, loff_t *ppos) | |
18404756 | 194 | { |
d036e67b | 195 | cpumask_var_t new_value; |
f18e439d | 196 | int err; |
18404756 | 197 | |
d036e67b RR |
198 | if (!alloc_cpumask_var(&new_value, GFP_KERNEL)) |
199 | return -ENOMEM; | |
200 | ||
201 | err = cpumask_parse_user(buffer, count, new_value); | |
18404756 | 202 | if (err) |
d036e67b | 203 | goto out; |
18404756 | 204 | |
d036e67b RR |
205 | if (!is_affinity_mask_valid(new_value)) { |
206 | err = -EINVAL; | |
207 | goto out; | |
208 | } | |
18404756 MK |
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 | */ | |
d036e67b RR |
215 | if (!cpumask_intersects(new_value, cpu_online_mask)) { |
216 | err = -EINVAL; | |
217 | goto out; | |
218 | } | |
18404756 | 219 | |
d036e67b RR |
220 | cpumask_copy(irq_default_affinity, new_value); |
221 | err = count; | |
18404756 | 222 | |
d036e67b RR |
223 | out: |
224 | free_cpumask_var(new_value); | |
225 | return err; | |
18404756 | 226 | } |
f18e439d AD |
227 | |
228 | static int default_affinity_open(struct inode *inode, struct file *file) | |
229 | { | |
d9dda78b | 230 | return single_open(file, default_affinity_show, PDE_DATA(inode)); |
f18e439d AD |
231 | } |
232 | ||
233 | static 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 | }; | |
92d6b71a DS |
240 | |
241 | static int irq_node_proc_show(struct seq_file *m, void *v) | |
242 | { | |
243 | struct irq_desc *desc = irq_to_desc((long) m->private); | |
244 | ||
6783011b | 245 | seq_printf(m, "%d\n", irq_desc_get_node(desc)); |
92d6b71a DS |
246 | return 0; |
247 | } | |
248 | ||
249 | static int irq_node_proc_open(struct inode *inode, struct file *file) | |
250 | { | |
d9dda78b | 251 | return single_open(file, irq_node_proc_show, PDE_DATA(inode)); |
92d6b71a DS |
252 | } |
253 | ||
254 | static 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 | }; | |
1da177e4 LT |
260 | #endif |
261 | ||
a1afb637 | 262 | static int irq_spurious_proc_show(struct seq_file *m, void *v) |
96d97cf0 | 263 | { |
a1afb637 AD |
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 | ||
272 | static int irq_spurious_proc_open(struct inode *inode, struct file *file) | |
273 | { | |
d9dda78b | 274 | return single_open(file, irq_spurious_proc_show, PDE_DATA(inode)); |
96d97cf0 AK |
275 | } |
276 | ||
a1afb637 AD |
277 | static 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 | ||
1da177e4 LT |
284 | #define MAX_NAMELEN 128 |
285 | ||
286 | static int name_unique(unsigned int irq, struct irqaction *new_action) | |
287 | { | |
08678b08 | 288 | struct irq_desc *desc = irq_to_desc(irq); |
1da177e4 | 289 | struct irqaction *action; |
d2d9433a DA |
290 | unsigned long flags; |
291 | int ret = 1; | |
1da177e4 | 292 | |
239007b8 | 293 | raw_spin_lock_irqsave(&desc->lock, flags); |
f944b5a7 | 294 | for_each_action_of_desc(desc, action) { |
1da177e4 | 295 | if ((action != new_action) && action->name && |
d2d9433a DA |
296 | !strcmp(new_action->name, action->name)) { |
297 | ret = 0; | |
298 | break; | |
299 | } | |
300 | } | |
239007b8 | 301 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
d2d9433a | 302 | return ret; |
1da177e4 LT |
303 | } |
304 | ||
305 | void register_handler_proc(unsigned int irq, struct irqaction *action) | |
306 | { | |
307 | char name [MAX_NAMELEN]; | |
08678b08 | 308 | struct irq_desc *desc = irq_to_desc(irq); |
1da177e4 | 309 | |
08678b08 | 310 | if (!desc->dir || action->dir || !action->name || |
1da177e4 LT |
311 | !name_unique(irq, action)) |
312 | return; | |
313 | ||
1da177e4 LT |
314 | snprintf(name, MAX_NAMELEN, "%s", action->name); |
315 | ||
316 | /* create /proc/irq/1234/handler/ */ | |
08678b08 | 317 | action->dir = proc_mkdir(name, desc->dir); |
1da177e4 LT |
318 | } |
319 | ||
320 | #undef MAX_NAMELEN | |
321 | ||
322 | #define MAX_NAMELEN 10 | |
323 | ||
2c6927a3 | 324 | void register_irq_proc(unsigned int irq, struct irq_desc *desc) |
1da177e4 | 325 | { |
95c2b175 | 326 | static DEFINE_MUTEX(register_lock); |
1da177e4 LT |
327 | char name [MAX_NAMELEN]; |
328 | ||
95c2b175 | 329 | if (!root_irq_dir || (desc->irq_data.chip == &no_irq_chip)) |
1da177e4 LT |
330 | return; |
331 | ||
95c2b175 BH |
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 | ||
1da177e4 LT |
342 | sprintf(name, "%d", irq); |
343 | ||
344 | /* create /proc/irq/1234 */ | |
08678b08 | 345 | desc->dir = proc_mkdir(name, root_irq_dir); |
c82a43d4 | 346 | if (!desc->dir) |
95c2b175 | 347 | goto out_unlock; |
1da177e4 LT |
348 | |
349 | #ifdef CONFIG_SMP | |
f18e439d | 350 | /* create /proc/irq/<irq>/smp_affinity */ |
bab5c790 | 351 | proc_create_data("smp_affinity", 0644, desc->dir, |
f18e439d | 352 | &irq_affinity_proc_fops, (void *)(long)irq); |
92d6b71a | 353 | |
e7a297b0 | 354 | /* create /proc/irq/<irq>/affinity_hint */ |
bab5c790 | 355 | proc_create_data("affinity_hint", 0444, desc->dir, |
e7a297b0 PWJ |
356 | &irq_affinity_hint_proc_fops, (void *)(long)irq); |
357 | ||
4b060420 | 358 | /* create /proc/irq/<irq>/smp_affinity_list */ |
bab5c790 | 359 | proc_create_data("smp_affinity_list", 0644, desc->dir, |
4b060420 MT |
360 | &irq_affinity_list_proc_fops, (void *)(long)irq); |
361 | ||
92d6b71a DS |
362 | proc_create_data("node", 0444, desc->dir, |
363 | &irq_node_proc_fops, (void *)(long)irq); | |
1da177e4 | 364 | #endif |
96d97cf0 | 365 | |
a1afb637 AD |
366 | proc_create_data("spurious", 0444, desc->dir, |
367 | &irq_spurious_proc_fops, (void *)(long)irq); | |
95c2b175 BH |
368 | |
369 | out_unlock: | |
370 | mutex_unlock(®ister_lock); | |
1da177e4 LT |
371 | } |
372 | ||
13bfe99e TG |
373 | void 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); | |
def945ee | 382 | remove_proc_entry("smp_affinity_list", desc->dir); |
13bfe99e TG |
383 | remove_proc_entry("node", desc->dir); |
384 | #endif | |
385 | remove_proc_entry("spurious", desc->dir); | |
386 | ||
13bfe99e TG |
387 | sprintf(name, "%u", irq); |
388 | remove_proc_entry(name, root_irq_dir); | |
389 | } | |
390 | ||
1da177e4 LT |
391 | #undef MAX_NAMELEN |
392 | ||
393 | void unregister_handler_proc(unsigned int irq, struct irqaction *action) | |
394 | { | |
a8ca16ea | 395 | proc_remove(action->dir); |
1da177e4 LT |
396 | } |
397 | ||
3786fc71 | 398 | static void register_default_affinity_proc(void) |
18404756 MK |
399 | { |
400 | #ifdef CONFIG_SMP | |
bab5c790 | 401 | proc_create("irq/default_smp_affinity", 0644, NULL, |
f18e439d | 402 | &default_affinity_proc_fops); |
18404756 MK |
403 | #endif |
404 | } | |
405 | ||
1da177e4 LT |
406 | void init_irq_proc(void) |
407 | { | |
2c6927a3 YL |
408 | unsigned int irq; |
409 | struct irq_desc *desc; | |
1da177e4 LT |
410 | |
411 | /* create /proc/irq */ | |
412 | root_irq_dir = proc_mkdir("irq", NULL); | |
413 | if (!root_irq_dir) | |
414 | return; | |
415 | ||
18404756 MK |
416 | register_default_affinity_proc(); |
417 | ||
1da177e4 LT |
418 | /* |
419 | * Create entries for all existing IRQs. | |
420 | */ | |
fe3464ca | 421 | for_each_irq_desc(irq, desc) |
2c6927a3 | 422 | register_irq_proc(irq, desc); |
1da177e4 LT |
423 | } |
424 | ||
c78b9b65 TG |
425 | #ifdef CONFIG_GENERIC_IRQ_SHOW |
426 | ||
427 | int __weak arch_show_interrupts(struct seq_file *p, int prec) | |
428 | { | |
429 | return 0; | |
430 | } | |
431 | ||
a6e120ed TG |
432 | #ifndef ACTUAL_NR_IRQS |
433 | # define ACTUAL_NR_IRQS nr_irqs | |
434 | #endif | |
435 | ||
c78b9b65 TG |
436 | int 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 | ||
a6e120ed | 445 | if (i > ACTUAL_NR_IRQS) |
c78b9b65 TG |
446 | return 0; |
447 | ||
a6e120ed | 448 | if (i == ACTUAL_NR_IRQS) |
c78b9b65 TG |
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 | ||
c291ee62 | 462 | irq_lock_sparse(); |
c78b9b65 TG |
463 | desc = irq_to_desc(i); |
464 | if (!desc) | |
c291ee62 | 465 | goto outsparse; |
c78b9b65 TG |
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; | |
4717f133 | 471 | if ((!action || irq_desc_is_chained(desc)) && !any_count) |
c78b9b65 TG |
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)); | |
ab7798ff TG |
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 | } | |
c12d2f42 GL |
488 | if (desc->irq_data.domain) |
489 | seq_printf(p, " %*d", prec, (int) desc->irq_data.hwirq); | |
94b2c363 | 490 | #ifdef CONFIG_GENERIC_IRQ_SHOW_LEVEL |
ab7798ff TG |
491 | seq_printf(p, " %-8s", irqd_is_level_type(&desc->irq_data) ? "Level" : "Edge"); |
492 | #endif | |
ee0401ec TG |
493 | if (desc->name) |
494 | seq_printf(p, "-%-8s", desc->name); | |
c78b9b65 TG |
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'); | |
503 | out: | |
504 | raw_spin_unlock_irqrestore(&desc->lock, flags); | |
c291ee62 TG |
505 | outsparse: |
506 | irq_unlock_sparse(); | |
c78b9b65 TG |
507 | return 0; |
508 | } | |
509 | #endif |