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> |
1da177e4 | 15 | |
97a41e26 AB |
16 | #include "internals.h" |
17 | ||
c291ee62 TG |
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 | */ | |
4a733ee1 | 35 | static struct proc_dir_entry *root_irq_dir; |
1da177e4 LT |
36 | |
37 | #ifdef CONFIG_SMP | |
38 | ||
4b060420 | 39 | static int show_irq_affinity(int type, struct seq_file *m, void *v) |
1da177e4 | 40 | { |
08678b08 | 41 | struct irq_desc *desc = irq_to_desc((long)m->private); |
9df872fa | 42 | const struct cpumask *mask = desc->irq_common_data.affinity; |
42ee2b74 AK |
43 | |
44 | #ifdef CONFIG_GENERIC_PENDING_IRQ | |
f230b6d5 | 45 | if (irqd_is_setaffinity_pending(&desc->irq_data)) |
7f7ace0c | 46 | mask = desc->pending_mask; |
42ee2b74 | 47 | #endif |
4b060420 | 48 | if (type) |
c1d7f03f | 49 | seq_printf(m, "%*pbl\n", cpumask_pr_args(mask)); |
4b060420 | 50 | else |
c1d7f03f | 51 | seq_printf(m, "%*pb\n", cpumask_pr_args(mask)); |
f18e439d | 52 | return 0; |
1da177e4 LT |
53 | } |
54 | ||
e7a297b0 PWJ |
55 | static int irq_affinity_hint_proc_show(struct seq_file *m, void *v) |
56 | { | |
57 | struct irq_desc *desc = irq_to_desc((long)m->private); | |
58 | unsigned long flags; | |
59 | cpumask_var_t mask; | |
60 | ||
4308ad80 | 61 | if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) |
e7a297b0 PWJ |
62 | return -ENOMEM; |
63 | ||
64 | raw_spin_lock_irqsave(&desc->lock, flags); | |
65 | if (desc->affinity_hint) | |
66 | cpumask_copy(mask, desc->affinity_hint); | |
e7a297b0 PWJ |
67 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
68 | ||
c1d7f03f | 69 | seq_printf(m, "%*pb\n", cpumask_pr_args(mask)); |
e7a297b0 PWJ |
70 | free_cpumask_var(mask); |
71 | ||
72 | return 0; | |
73 | } | |
74 | ||
25d61578 JK |
75 | #ifndef is_affinity_mask_valid |
76 | #define is_affinity_mask_valid(val) 1 | |
77 | #endif | |
78 | ||
1da177e4 | 79 | int no_irq_affinity; |
4b060420 MT |
80 | static int irq_affinity_proc_show(struct seq_file *m, void *v) |
81 | { | |
82 | return show_irq_affinity(0, m, v); | |
83 | } | |
84 | ||
85 | static int irq_affinity_list_proc_show(struct seq_file *m, void *v) | |
86 | { | |
87 | return show_irq_affinity(1, m, v); | |
88 | } | |
89 | ||
90 | ||
91 | static ssize_t write_irq_affinity(int type, struct file *file, | |
f18e439d | 92 | const char __user *buffer, size_t count, loff_t *pos) |
1da177e4 | 93 | { |
d9dda78b | 94 | unsigned int irq = (int)(long)PDE_DATA(file_inode(file)); |
0de26520 | 95 | cpumask_var_t new_value; |
f18e439d | 96 | int err; |
1da177e4 | 97 | |
bce43032 | 98 | if (!irq_can_set_affinity(irq) || no_irq_affinity) |
1da177e4 LT |
99 | return -EIO; |
100 | ||
0de26520 RR |
101 | if (!alloc_cpumask_var(&new_value, GFP_KERNEL)) |
102 | return -ENOMEM; | |
103 | ||
4b060420 MT |
104 | if (type) |
105 | err = cpumask_parselist_user(buffer, count, new_value); | |
106 | else | |
107 | err = cpumask_parse_user(buffer, count, new_value); | |
1da177e4 | 108 | if (err) |
0de26520 | 109 | goto free_cpumask; |
1da177e4 | 110 | |
6bdf197b | 111 | if (!is_affinity_mask_valid(new_value)) { |
0de26520 RR |
112 | err = -EINVAL; |
113 | goto free_cpumask; | |
114 | } | |
25d61578 | 115 | |
1da177e4 LT |
116 | /* |
117 | * Do not allow disabling IRQs completely - it's a too easy | |
118 | * way to make the system unusable accidentally :-) At least | |
119 | * one online CPU still has to be targeted. | |
120 | */ | |
0de26520 | 121 | if (!cpumask_intersects(new_value, cpu_online_mask)) { |
eee45269 IK |
122 | /* Special case for empty set - allow the architecture |
123 | code to set default SMP affinity. */ | |
3b8249e7 | 124 | err = irq_select_affinity_usr(irq, new_value) ? -EINVAL : count; |
0de26520 RR |
125 | } else { |
126 | irq_set_affinity(irq, new_value); | |
127 | err = count; | |
128 | } | |
129 | ||
130 | free_cpumask: | |
131 | free_cpumask_var(new_value); | |
132 | return err; | |
1da177e4 LT |
133 | } |
134 | ||
4b060420 MT |
135 | static ssize_t irq_affinity_proc_write(struct file *file, |
136 | const char __user *buffer, size_t count, loff_t *pos) | |
137 | { | |
138 | return write_irq_affinity(0, file, buffer, count, pos); | |
139 | } | |
140 | ||
141 | static ssize_t irq_affinity_list_proc_write(struct file *file, | |
142 | const char __user *buffer, size_t count, loff_t *pos) | |
143 | { | |
144 | return write_irq_affinity(1, file, buffer, count, pos); | |
145 | } | |
146 | ||
f18e439d | 147 | static int irq_affinity_proc_open(struct inode *inode, struct file *file) |
18404756 | 148 | { |
d9dda78b | 149 | return single_open(file, irq_affinity_proc_show, PDE_DATA(inode)); |
18404756 MK |
150 | } |
151 | ||
4b060420 MT |
152 | static int irq_affinity_list_proc_open(struct inode *inode, struct file *file) |
153 | { | |
d9dda78b | 154 | return single_open(file, irq_affinity_list_proc_show, PDE_DATA(inode)); |
4b060420 MT |
155 | } |
156 | ||
e7a297b0 PWJ |
157 | static int irq_affinity_hint_proc_open(struct inode *inode, struct file *file) |
158 | { | |
d9dda78b | 159 | return single_open(file, irq_affinity_hint_proc_show, PDE_DATA(inode)); |
e7a297b0 PWJ |
160 | } |
161 | ||
f18e439d AD |
162 | static const struct file_operations irq_affinity_proc_fops = { |
163 | .open = irq_affinity_proc_open, | |
164 | .read = seq_read, | |
165 | .llseek = seq_lseek, | |
166 | .release = single_release, | |
167 | .write = irq_affinity_proc_write, | |
168 | }; | |
169 | ||
e7a297b0 PWJ |
170 | static const struct file_operations irq_affinity_hint_proc_fops = { |
171 | .open = irq_affinity_hint_proc_open, | |
172 | .read = seq_read, | |
173 | .llseek = seq_lseek, | |
174 | .release = single_release, | |
175 | }; | |
176 | ||
4b060420 MT |
177 | static const struct file_operations irq_affinity_list_proc_fops = { |
178 | .open = irq_affinity_list_proc_open, | |
179 | .read = seq_read, | |
180 | .llseek = seq_lseek, | |
181 | .release = single_release, | |
182 | .write = irq_affinity_list_proc_write, | |
183 | }; | |
184 | ||
f18e439d AD |
185 | static int default_affinity_show(struct seq_file *m, void *v) |
186 | { | |
c1d7f03f | 187 | seq_printf(m, "%*pb\n", cpumask_pr_args(irq_default_affinity)); |
f18e439d AD |
188 | return 0; |
189 | } | |
190 | ||
191 | static ssize_t default_affinity_write(struct file *file, | |
192 | const char __user *buffer, size_t count, loff_t *ppos) | |
18404756 | 193 | { |
d036e67b | 194 | cpumask_var_t new_value; |
f18e439d | 195 | int err; |
18404756 | 196 | |
d036e67b RR |
197 | if (!alloc_cpumask_var(&new_value, GFP_KERNEL)) |
198 | return -ENOMEM; | |
199 | ||
200 | err = cpumask_parse_user(buffer, count, new_value); | |
18404756 | 201 | if (err) |
d036e67b | 202 | goto out; |
18404756 | 203 | |
d036e67b RR |
204 | if (!is_affinity_mask_valid(new_value)) { |
205 | err = -EINVAL; | |
206 | goto out; | |
207 | } | |
18404756 MK |
208 | |
209 | /* | |
210 | * Do not allow disabling IRQs completely - it's a too easy | |
211 | * way to make the system unusable accidentally :-) At least | |
212 | * one online CPU still has to be targeted. | |
213 | */ | |
d036e67b RR |
214 | if (!cpumask_intersects(new_value, cpu_online_mask)) { |
215 | err = -EINVAL; | |
216 | goto out; | |
217 | } | |
18404756 | 218 | |
d036e67b RR |
219 | cpumask_copy(irq_default_affinity, new_value); |
220 | err = count; | |
18404756 | 221 | |
d036e67b RR |
222 | out: |
223 | free_cpumask_var(new_value); | |
224 | return err; | |
18404756 | 225 | } |
f18e439d AD |
226 | |
227 | static int default_affinity_open(struct inode *inode, struct file *file) | |
228 | { | |
d9dda78b | 229 | return single_open(file, default_affinity_show, PDE_DATA(inode)); |
f18e439d AD |
230 | } |
231 | ||
232 | static const struct file_operations default_affinity_proc_fops = { | |
233 | .open = default_affinity_open, | |
234 | .read = seq_read, | |
235 | .llseek = seq_lseek, | |
236 | .release = single_release, | |
237 | .write = default_affinity_write, | |
238 | }; | |
92d6b71a DS |
239 | |
240 | static int irq_node_proc_show(struct seq_file *m, void *v) | |
241 | { | |
242 | struct irq_desc *desc = irq_to_desc((long) m->private); | |
243 | ||
6783011b | 244 | seq_printf(m, "%d\n", irq_desc_get_node(desc)); |
92d6b71a DS |
245 | return 0; |
246 | } | |
247 | ||
248 | static int irq_node_proc_open(struct inode *inode, struct file *file) | |
249 | { | |
d9dda78b | 250 | return single_open(file, irq_node_proc_show, PDE_DATA(inode)); |
92d6b71a DS |
251 | } |
252 | ||
253 | static const struct file_operations irq_node_proc_fops = { | |
254 | .open = irq_node_proc_open, | |
255 | .read = seq_read, | |
256 | .llseek = seq_lseek, | |
257 | .release = single_release, | |
258 | }; | |
1da177e4 LT |
259 | #endif |
260 | ||
a1afb637 | 261 | static int irq_spurious_proc_show(struct seq_file *m, void *v) |
96d97cf0 | 262 | { |
a1afb637 AD |
263 | struct irq_desc *desc = irq_to_desc((long) m->private); |
264 | ||
265 | seq_printf(m, "count %u\n" "unhandled %u\n" "last_unhandled %u ms\n", | |
266 | desc->irq_count, desc->irqs_unhandled, | |
267 | jiffies_to_msecs(desc->last_unhandled)); | |
268 | return 0; | |
269 | } | |
270 | ||
271 | static int irq_spurious_proc_open(struct inode *inode, struct file *file) | |
272 | { | |
d9dda78b | 273 | return single_open(file, irq_spurious_proc_show, PDE_DATA(inode)); |
96d97cf0 AK |
274 | } |
275 | ||
a1afb637 AD |
276 | static const struct file_operations irq_spurious_proc_fops = { |
277 | .open = irq_spurious_proc_open, | |
278 | .read = seq_read, | |
279 | .llseek = seq_lseek, | |
280 | .release = single_release, | |
281 | }; | |
282 | ||
1da177e4 LT |
283 | #define MAX_NAMELEN 128 |
284 | ||
285 | static int name_unique(unsigned int irq, struct irqaction *new_action) | |
286 | { | |
08678b08 | 287 | struct irq_desc *desc = irq_to_desc(irq); |
1da177e4 | 288 | struct irqaction *action; |
d2d9433a DA |
289 | unsigned long flags; |
290 | int ret = 1; | |
1da177e4 | 291 | |
239007b8 | 292 | raw_spin_lock_irqsave(&desc->lock, flags); |
d2d9433a | 293 | for (action = desc->action ; action; action = action->next) { |
1da177e4 | 294 | if ((action != new_action) && action->name && |
d2d9433a DA |
295 | !strcmp(new_action->name, action->name)) { |
296 | ret = 0; | |
297 | break; | |
298 | } | |
299 | } | |
239007b8 | 300 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
d2d9433a | 301 | return ret; |
1da177e4 LT |
302 | } |
303 | ||
304 | void register_handler_proc(unsigned int irq, struct irqaction *action) | |
305 | { | |
306 | char name [MAX_NAMELEN]; | |
08678b08 | 307 | struct irq_desc *desc = irq_to_desc(irq); |
1da177e4 | 308 | |
08678b08 | 309 | if (!desc->dir || action->dir || !action->name || |
1da177e4 LT |
310 | !name_unique(irq, action)) |
311 | return; | |
312 | ||
313 | memset(name, 0, MAX_NAMELEN); | |
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 LT |
325 | { |
326 | char name [MAX_NAMELEN]; | |
327 | ||
6b8ff312 | 328 | if (!root_irq_dir || (desc->irq_data.chip == &no_irq_chip) || desc->dir) |
1da177e4 LT |
329 | return; |
330 | ||
331 | memset(name, 0, MAX_NAMELEN); | |
332 | sprintf(name, "%d", irq); | |
333 | ||
334 | /* create /proc/irq/1234 */ | |
08678b08 | 335 | desc->dir = proc_mkdir(name, root_irq_dir); |
c82a43d4 CG |
336 | if (!desc->dir) |
337 | return; | |
1da177e4 LT |
338 | |
339 | #ifdef CONFIG_SMP | |
f18e439d | 340 | /* create /proc/irq/<irq>/smp_affinity */ |
bab5c790 | 341 | proc_create_data("smp_affinity", 0644, desc->dir, |
f18e439d | 342 | &irq_affinity_proc_fops, (void *)(long)irq); |
92d6b71a | 343 | |
e7a297b0 | 344 | /* create /proc/irq/<irq>/affinity_hint */ |
bab5c790 | 345 | proc_create_data("affinity_hint", 0444, desc->dir, |
e7a297b0 PWJ |
346 | &irq_affinity_hint_proc_fops, (void *)(long)irq); |
347 | ||
4b060420 | 348 | /* create /proc/irq/<irq>/smp_affinity_list */ |
bab5c790 | 349 | proc_create_data("smp_affinity_list", 0644, desc->dir, |
4b060420 MT |
350 | &irq_affinity_list_proc_fops, (void *)(long)irq); |
351 | ||
92d6b71a DS |
352 | proc_create_data("node", 0444, desc->dir, |
353 | &irq_node_proc_fops, (void *)(long)irq); | |
1da177e4 | 354 | #endif |
96d97cf0 | 355 | |
a1afb637 AD |
356 | proc_create_data("spurious", 0444, desc->dir, |
357 | &irq_spurious_proc_fops, (void *)(long)irq); | |
1da177e4 LT |
358 | } |
359 | ||
13bfe99e TG |
360 | void unregister_irq_proc(unsigned int irq, struct irq_desc *desc) |
361 | { | |
362 | char name [MAX_NAMELEN]; | |
363 | ||
364 | if (!root_irq_dir || !desc->dir) | |
365 | return; | |
366 | #ifdef CONFIG_SMP | |
367 | remove_proc_entry("smp_affinity", desc->dir); | |
368 | remove_proc_entry("affinity_hint", desc->dir); | |
def945ee | 369 | remove_proc_entry("smp_affinity_list", desc->dir); |
13bfe99e TG |
370 | remove_proc_entry("node", desc->dir); |
371 | #endif | |
372 | remove_proc_entry("spurious", desc->dir); | |
373 | ||
374 | memset(name, 0, MAX_NAMELEN); | |
375 | sprintf(name, "%u", irq); | |
376 | remove_proc_entry(name, root_irq_dir); | |
377 | } | |
378 | ||
1da177e4 LT |
379 | #undef MAX_NAMELEN |
380 | ||
381 | void unregister_handler_proc(unsigned int irq, struct irqaction *action) | |
382 | { | |
a8ca16ea | 383 | proc_remove(action->dir); |
1da177e4 LT |
384 | } |
385 | ||
3786fc71 | 386 | static void register_default_affinity_proc(void) |
18404756 MK |
387 | { |
388 | #ifdef CONFIG_SMP | |
bab5c790 | 389 | proc_create("irq/default_smp_affinity", 0644, NULL, |
f18e439d | 390 | &default_affinity_proc_fops); |
18404756 MK |
391 | #endif |
392 | } | |
393 | ||
1da177e4 LT |
394 | void init_irq_proc(void) |
395 | { | |
2c6927a3 YL |
396 | unsigned int irq; |
397 | struct irq_desc *desc; | |
1da177e4 LT |
398 | |
399 | /* create /proc/irq */ | |
400 | root_irq_dir = proc_mkdir("irq", NULL); | |
401 | if (!root_irq_dir) | |
402 | return; | |
403 | ||
18404756 MK |
404 | register_default_affinity_proc(); |
405 | ||
1da177e4 LT |
406 | /* |
407 | * Create entries for all existing IRQs. | |
408 | */ | |
0b8f1efa YL |
409 | for_each_irq_desc(irq, desc) { |
410 | if (!desc) | |
411 | continue; | |
412 | ||
2c6927a3 | 413 | register_irq_proc(irq, desc); |
0b8f1efa | 414 | } |
1da177e4 LT |
415 | } |
416 | ||
c78b9b65 TG |
417 | #ifdef CONFIG_GENERIC_IRQ_SHOW |
418 | ||
419 | int __weak arch_show_interrupts(struct seq_file *p, int prec) | |
420 | { | |
421 | return 0; | |
422 | } | |
423 | ||
a6e120ed TG |
424 | #ifndef ACTUAL_NR_IRQS |
425 | # define ACTUAL_NR_IRQS nr_irqs | |
426 | #endif | |
427 | ||
c78b9b65 TG |
428 | int show_interrupts(struct seq_file *p, void *v) |
429 | { | |
430 | static int prec; | |
431 | ||
432 | unsigned long flags, any_count = 0; | |
433 | int i = *(loff_t *) v, j; | |
434 | struct irqaction *action; | |
435 | struct irq_desc *desc; | |
436 | ||
a6e120ed | 437 | if (i > ACTUAL_NR_IRQS) |
c78b9b65 TG |
438 | return 0; |
439 | ||
a6e120ed | 440 | if (i == ACTUAL_NR_IRQS) |
c78b9b65 TG |
441 | return arch_show_interrupts(p, prec); |
442 | ||
443 | /* print header and calculate the width of the first column */ | |
444 | if (i == 0) { | |
445 | for (prec = 3, j = 1000; prec < 10 && j <= nr_irqs; ++prec) | |
446 | j *= 10; | |
447 | ||
448 | seq_printf(p, "%*s", prec + 8, ""); | |
449 | for_each_online_cpu(j) | |
450 | seq_printf(p, "CPU%-8d", j); | |
451 | seq_putc(p, '\n'); | |
452 | } | |
453 | ||
c291ee62 | 454 | irq_lock_sparse(); |
c78b9b65 TG |
455 | desc = irq_to_desc(i); |
456 | if (!desc) | |
c291ee62 | 457 | goto outsparse; |
c78b9b65 TG |
458 | |
459 | raw_spin_lock_irqsave(&desc->lock, flags); | |
460 | for_each_online_cpu(j) | |
461 | any_count |= kstat_irqs_cpu(i, j); | |
462 | action = desc->action; | |
463 | if (!action && !any_count) | |
464 | goto out; | |
465 | ||
466 | seq_printf(p, "%*d: ", prec, i); | |
467 | for_each_online_cpu(j) | |
468 | seq_printf(p, "%10u ", kstat_irqs_cpu(i, j)); | |
ab7798ff TG |
469 | |
470 | if (desc->irq_data.chip) { | |
471 | if (desc->irq_data.chip->irq_print_chip) | |
472 | desc->irq_data.chip->irq_print_chip(&desc->irq_data, p); | |
473 | else if (desc->irq_data.chip->name) | |
474 | seq_printf(p, " %8s", desc->irq_data.chip->name); | |
475 | else | |
476 | seq_printf(p, " %8s", "-"); | |
477 | } else { | |
478 | seq_printf(p, " %8s", "None"); | |
479 | } | |
c12d2f42 GL |
480 | if (desc->irq_data.domain) |
481 | seq_printf(p, " %*d", prec, (int) desc->irq_data.hwirq); | |
94b2c363 | 482 | #ifdef CONFIG_GENERIC_IRQ_SHOW_LEVEL |
ab7798ff TG |
483 | seq_printf(p, " %-8s", irqd_is_level_type(&desc->irq_data) ? "Level" : "Edge"); |
484 | #endif | |
ee0401ec TG |
485 | if (desc->name) |
486 | seq_printf(p, "-%-8s", desc->name); | |
c78b9b65 TG |
487 | |
488 | if (action) { | |
489 | seq_printf(p, " %s", action->name); | |
490 | while ((action = action->next) != NULL) | |
491 | seq_printf(p, ", %s", action->name); | |
492 | } | |
493 | ||
494 | seq_putc(p, '\n'); | |
495 | out: | |
496 | raw_spin_unlock_irqrestore(&desc->lock, flags); | |
c291ee62 TG |
497 | outsparse: |
498 | irq_unlock_sparse(); | |
c78b9b65 TG |
499 | return 0; |
500 | } | |
501 | #endif |