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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 | |
16 | #include "internals.h" |
17 | |
18 | static struct proc_dir_entry *root_irq_dir; |
19 | |
20 | #ifdef CONFIG_SMP |
21 | |
22 | static int show_irq_affinity(int type, struct seq_file *m, void *v) |
23 | { |
24 | struct irq_desc *desc = irq_to_desc((long)m->private); |
25 | const struct cpumask *mask = desc->irq_data.affinity; |
26 | |
27 | #ifdef CONFIG_GENERIC_PENDING_IRQ |
28 | if (irqd_is_setaffinity_pending(&desc->irq_data)) |
29 | mask = desc->pending_mask; |
30 | #endif |
31 | if (type) |
32 | seq_cpumask_list(m, mask); |
33 | else |
34 | seq_cpumask(m, mask); |
35 | seq_putc(m, '\n'); |
36 | return 0; |
37 | } |
38 | |
39 | static int irq_affinity_hint_proc_show(struct seq_file *m, void *v) |
40 | { |
41 | struct irq_desc *desc = irq_to_desc((long)m->private); |
42 | unsigned long flags; |
43 | cpumask_var_t mask; |
44 | |
45 | if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) |
46 | return -ENOMEM; |
47 | |
48 | raw_spin_lock_irqsave(&desc->lock, flags); |
49 | if (desc->affinity_hint) |
50 | cpumask_copy(mask, desc->affinity_hint); |
51 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
52 | |
53 | seq_cpumask(m, mask); |
54 | seq_putc(m, '\n'); |
55 | free_cpumask_var(mask); |
56 | |
57 | return 0; |
58 | } |
59 | |
60 | #ifndef is_affinity_mask_valid |
61 | #define is_affinity_mask_valid(val) 1 |
62 | #endif |
63 | |
64 | int no_irq_affinity; |
65 | static int irq_affinity_proc_show(struct seq_file *m, void *v) |
66 | { |
67 | return show_irq_affinity(0, m, v); |
68 | } |
69 | |
70 | static int irq_affinity_list_proc_show(struct seq_file *m, void *v) |
71 | { |
72 | return show_irq_affinity(1, m, v); |
73 | } |
74 | |
75 | |
76 | static ssize_t write_irq_affinity(int type, struct file *file, |
77 | const char __user *buffer, size_t count, loff_t *pos) |
78 | { |
79 | unsigned int irq = (int)(long)PDE(file->f_path.dentry->d_inode)->data; |
80 | cpumask_var_t new_value; |
81 | int err; |
82 | |
83 | if (!irq_can_set_affinity(irq) || no_irq_affinity) |
84 | return -EIO; |
85 | |
86 | if (!alloc_cpumask_var(&new_value, GFP_KERNEL)) |
87 | return -ENOMEM; |
88 | |
89 | if (type) |
90 | err = cpumask_parselist_user(buffer, count, new_value); |
91 | else |
92 | err = cpumask_parse_user(buffer, count, new_value); |
93 | if (err) |
94 | goto free_cpumask; |
95 | |
96 | if (!is_affinity_mask_valid(new_value)) { |
97 | err = -EINVAL; |
98 | goto free_cpumask; |
99 | } |
100 | |
101 | /* |
102 | * Do not allow disabling IRQs completely - it's a too easy |
103 | * way to make the system unusable accidentally :-) At least |
104 | * one online CPU still has to be targeted. |
105 | */ |
106 | if (!cpumask_intersects(new_value, cpu_online_mask)) { |
107 | /* Special case for empty set - allow the architecture |
108 | code to set default SMP affinity. */ |
109 | err = irq_select_affinity_usr(irq, new_value) ? -EINVAL : count; |
110 | } else { |
111 | irq_set_affinity(irq, new_value); |
112 | err = count; |
113 | } |
114 | |
115 | free_cpumask: |
116 | free_cpumask_var(new_value); |
117 | return err; |
118 | } |
119 | |
120 | static ssize_t irq_affinity_proc_write(struct file *file, |
121 | const char __user *buffer, size_t count, loff_t *pos) |
122 | { |
123 | return write_irq_affinity(0, file, buffer, count, pos); |
124 | } |
125 | |
126 | static ssize_t irq_affinity_list_proc_write(struct file *file, |
127 | const char __user *buffer, size_t count, loff_t *pos) |
128 | { |
129 | return write_irq_affinity(1, file, buffer, count, pos); |
130 | } |
131 | |
132 | static int irq_affinity_proc_open(struct inode *inode, struct file *file) |
133 | { |
134 | return single_open(file, irq_affinity_proc_show, PDE(inode)->data); |
135 | } |
136 | |
137 | static int irq_affinity_list_proc_open(struct inode *inode, struct file *file) |
138 | { |
139 | return single_open(file, irq_affinity_list_proc_show, PDE(inode)->data); |
140 | } |
141 | |
142 | static int irq_affinity_hint_proc_open(struct inode *inode, struct file *file) |
143 | { |
144 | return single_open(file, irq_affinity_hint_proc_show, PDE(inode)->data); |
145 | } |
146 | |
147 | static const struct file_operations irq_affinity_proc_fops = { |
148 | .open = irq_affinity_proc_open, |
149 | .read = seq_read, |
150 | .llseek = seq_lseek, |
151 | .release = single_release, |
152 | .write = irq_affinity_proc_write, |
153 | }; |
154 | |
155 | static const struct file_operations irq_affinity_hint_proc_fops = { |
156 | .open = irq_affinity_hint_proc_open, |
157 | .read = seq_read, |
158 | .llseek = seq_lseek, |
159 | .release = single_release, |
160 | }; |
161 | |
162 | static const struct file_operations irq_affinity_list_proc_fops = { |
163 | .open = irq_affinity_list_proc_open, |
164 | .read = seq_read, |
165 | .llseek = seq_lseek, |
166 | .release = single_release, |
167 | .write = irq_affinity_list_proc_write, |
168 | }; |
169 | |
170 | static int default_affinity_show(struct seq_file *m, void *v) |
171 | { |
172 | seq_cpumask(m, irq_default_affinity); |
173 | seq_putc(m, '\n'); |
174 | return 0; |
175 | } |
176 | |
177 | static ssize_t default_affinity_write(struct file *file, |
178 | const char __user *buffer, size_t count, loff_t *ppos) |
179 | { |
180 | cpumask_var_t new_value; |
181 | int err; |
182 | |
183 | if (!alloc_cpumask_var(&new_value, GFP_KERNEL)) |
184 | return -ENOMEM; |
185 | |
186 | err = cpumask_parse_user(buffer, count, new_value); |
187 | if (err) |
188 | goto out; |
189 | |
190 | if (!is_affinity_mask_valid(new_value)) { |
191 | err = -EINVAL; |
192 | goto out; |
193 | } |
194 | |
195 | /* |
196 | * Do not allow disabling IRQs completely - it's a too easy |
197 | * way to make the system unusable accidentally :-) At least |
198 | * one online CPU still has to be targeted. |
199 | */ |
200 | if (!cpumask_intersects(new_value, cpu_online_mask)) { |
201 | err = -EINVAL; |
202 | goto out; |
203 | } |
204 | |
205 | cpumask_copy(irq_default_affinity, new_value); |
206 | err = count; |
207 | |
208 | out: |
209 | free_cpumask_var(new_value); |
210 | return err; |
211 | } |
212 | |
213 | static int default_affinity_open(struct inode *inode, struct file *file) |
214 | { |
215 | return single_open(file, default_affinity_show, PDE(inode)->data); |
216 | } |
217 | |
218 | static const struct file_operations default_affinity_proc_fops = { |
219 | .open = default_affinity_open, |
220 | .read = seq_read, |
221 | .llseek = seq_lseek, |
222 | .release = single_release, |
223 | .write = default_affinity_write, |
224 | }; |
225 | |
226 | static int irq_node_proc_show(struct seq_file *m, void *v) |
227 | { |
228 | struct irq_desc *desc = irq_to_desc((long) m->private); |
229 | |
230 | seq_printf(m, "%d\n", desc->irq_data.node); |
231 | return 0; |
232 | } |
233 | |
234 | static int irq_node_proc_open(struct inode *inode, struct file *file) |
235 | { |
236 | return single_open(file, irq_node_proc_show, PDE(inode)->data); |
237 | } |
238 | |
239 | static const struct file_operations irq_node_proc_fops = { |
240 | .open = irq_node_proc_open, |
241 | .read = seq_read, |
242 | .llseek = seq_lseek, |
243 | .release = single_release, |
244 | }; |
245 | #endif |
246 | |
247 | static int irq_spurious_proc_show(struct seq_file *m, void *v) |
248 | { |
249 | struct irq_desc *desc = irq_to_desc((long) m->private); |
250 | |
251 | seq_printf(m, "count %u\n" "unhandled %u\n" "last_unhandled %u ms\n", |
252 | desc->irq_count, desc->irqs_unhandled, |
253 | jiffies_to_msecs(desc->last_unhandled)); |
254 | return 0; |
255 | } |
256 | |
257 | static int irq_spurious_proc_open(struct inode *inode, struct file *file) |
258 | { |
259 | return single_open(file, irq_spurious_proc_show, PDE(inode)->data); |
260 | } |
261 | |
262 | static const struct file_operations irq_spurious_proc_fops = { |
263 | .open = irq_spurious_proc_open, |
264 | .read = seq_read, |
265 | .llseek = seq_lseek, |
266 | .release = single_release, |
267 | }; |
268 | |
269 | #define MAX_NAMELEN 128 |
270 | |
271 | static int name_unique(unsigned int irq, struct irqaction *new_action) |
272 | { |
273 | struct irq_desc *desc = irq_to_desc(irq); |
274 | struct irqaction *action; |
275 | unsigned long flags; |
276 | int ret = 1; |
277 | |
278 | raw_spin_lock_irqsave(&desc->lock, flags); |
279 | for (action = desc->action ; action; action = action->next) { |
280 | if ((action != new_action) && action->name && |
281 | !strcmp(new_action->name, action->name)) { |
282 | ret = 0; |
283 | break; |
284 | } |
285 | } |
286 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
287 | return ret; |
288 | } |
289 | |
290 | void register_handler_proc(unsigned int irq, struct irqaction *action) |
291 | { |
292 | char name [MAX_NAMELEN]; |
293 | struct irq_desc *desc = irq_to_desc(irq); |
294 | |
295 | if (!desc->dir || action->dir || !action->name || |
296 | !name_unique(irq, action)) |
297 | return; |
298 | |
299 | memset(name, 0, MAX_NAMELEN); |
300 | snprintf(name, MAX_NAMELEN, "%s", action->name); |
301 | |
302 | /* create /proc/irq/1234/handler/ */ |
303 | action->dir = proc_mkdir(name, desc->dir); |
304 | } |
305 | |
306 | #undef MAX_NAMELEN |
307 | |
308 | #define MAX_NAMELEN 10 |
309 | |
310 | void register_irq_proc(unsigned int irq, struct irq_desc *desc) |
311 | { |
312 | char name [MAX_NAMELEN]; |
313 | |
314 | if (!root_irq_dir || (desc->irq_data.chip == &no_irq_chip) || desc->dir) |
315 | return; |
316 | |
317 | memset(name, 0, MAX_NAMELEN); |
318 | sprintf(name, "%d", irq); |
319 | |
320 | /* create /proc/irq/1234 */ |
321 | desc->dir = proc_mkdir(name, root_irq_dir); |
322 | if (!desc->dir) |
323 | return; |
324 | |
325 | #ifdef CONFIG_SMP |
326 | /* create /proc/irq/<irq>/smp_affinity */ |
327 | proc_create_data("smp_affinity", 0600, desc->dir, |
328 | &irq_affinity_proc_fops, (void *)(long)irq); |
329 | |
330 | /* create /proc/irq/<irq>/affinity_hint */ |
331 | proc_create_data("affinity_hint", 0400, desc->dir, |
332 | &irq_affinity_hint_proc_fops, (void *)(long)irq); |
333 | |
334 | /* create /proc/irq/<irq>/smp_affinity_list */ |
335 | proc_create_data("smp_affinity_list", 0600, desc->dir, |
336 | &irq_affinity_list_proc_fops, (void *)(long)irq); |
337 | |
338 | proc_create_data("node", 0444, desc->dir, |
339 | &irq_node_proc_fops, (void *)(long)irq); |
340 | #endif |
341 | |
342 | proc_create_data("spurious", 0444, desc->dir, |
343 | &irq_spurious_proc_fops, (void *)(long)irq); |
344 | } |
345 | |
346 | void unregister_irq_proc(unsigned int irq, struct irq_desc *desc) |
347 | { |
348 | char name [MAX_NAMELEN]; |
349 | |
350 | if (!root_irq_dir || !desc->dir) |
351 | return; |
352 | #ifdef CONFIG_SMP |
353 | remove_proc_entry("smp_affinity", desc->dir); |
354 | remove_proc_entry("affinity_hint", desc->dir); |
355 | remove_proc_entry("smp_affinity_list", desc->dir); |
356 | remove_proc_entry("node", desc->dir); |
357 | #endif |
358 | remove_proc_entry("spurious", desc->dir); |
359 | |
360 | memset(name, 0, MAX_NAMELEN); |
361 | sprintf(name, "%u", irq); |
362 | remove_proc_entry(name, root_irq_dir); |
363 | } |
364 | |
365 | #undef MAX_NAMELEN |
366 | |
367 | void unregister_handler_proc(unsigned int irq, struct irqaction *action) |
368 | { |
369 | if (action->dir) { |
370 | struct irq_desc *desc = irq_to_desc(irq); |
371 | |
372 | remove_proc_entry(action->dir->name, desc->dir); |
373 | } |
374 | } |
375 | |
376 | static void register_default_affinity_proc(void) |
377 | { |
378 | #ifdef CONFIG_SMP |
379 | proc_create("irq/default_smp_affinity", 0600, NULL, |
380 | &default_affinity_proc_fops); |
381 | #endif |
382 | } |
383 | |
384 | void init_irq_proc(void) |
385 | { |
386 | unsigned int irq; |
387 | struct irq_desc *desc; |
388 | |
389 | /* create /proc/irq */ |
390 | root_irq_dir = proc_mkdir("irq", NULL); |
391 | if (!root_irq_dir) |
392 | return; |
393 | |
394 | register_default_affinity_proc(); |
395 | |
396 | /* |
397 | * Create entries for all existing IRQs. |
398 | */ |
399 | for_each_irq_desc(irq, desc) { |
400 | if (!desc) |
401 | continue; |
402 | |
403 | register_irq_proc(irq, desc); |
404 | } |
405 | } |
406 | |
407 | #ifdef CONFIG_GENERIC_IRQ_SHOW |
408 | |
409 | int __weak arch_show_interrupts(struct seq_file *p, int prec) |
410 | { |
411 | return 0; |
412 | } |
413 | |
414 | #ifndef ACTUAL_NR_IRQS |
415 | # define ACTUAL_NR_IRQS nr_irqs |
416 | #endif |
417 | |
418 | int show_interrupts(struct seq_file *p, void *v) |
419 | { |
420 | static int prec; |
421 | |
422 | unsigned long flags, any_count = 0; |
423 | int i = *(loff_t *) v, j; |
424 | struct irqaction *action; |
425 | struct irq_desc *desc; |
426 | |
427 | if (i > ACTUAL_NR_IRQS) |
428 | return 0; |
429 | |
430 | if (i == ACTUAL_NR_IRQS) |
431 | return arch_show_interrupts(p, prec); |
432 | |
433 | /* print header and calculate the width of the first column */ |
434 | if (i == 0) { |
435 | for (prec = 3, j = 1000; prec < 10 && j <= nr_irqs; ++prec) |
436 | j *= 10; |
437 | |
438 | seq_printf(p, "%*s", prec + 8, ""); |
439 | for_each_online_cpu(j) |
440 | seq_printf(p, "CPU%-8d", j); |
441 | seq_putc(p, '\n'); |
442 | } |
443 | |
444 | desc = irq_to_desc(i); |
445 | if (!desc) |
446 | return 0; |
447 | |
448 | raw_spin_lock_irqsave(&desc->lock, flags); |
449 | for_each_online_cpu(j) |
450 | any_count |= kstat_irqs_cpu(i, j); |
451 | action = desc->action; |
452 | if (!action && !any_count) |
453 | goto out; |
454 | |
455 | seq_printf(p, "%*d: ", prec, i); |
456 | for_each_online_cpu(j) |
457 | seq_printf(p, "%10u ", kstat_irqs_cpu(i, j)); |
458 | |
459 | if (desc->irq_data.chip) { |
460 | if (desc->irq_data.chip->irq_print_chip) |
461 | desc->irq_data.chip->irq_print_chip(&desc->irq_data, p); |
462 | else if (desc->irq_data.chip->name) |
463 | seq_printf(p, " %8s", desc->irq_data.chip->name); |
464 | else |
465 | seq_printf(p, " %8s", "-"); |
466 | } else { |
467 | seq_printf(p, " %8s", "None"); |
468 | } |
469 | #ifdef CONFIG_GENERIC_IRQ_SHOW_LEVEL |
470 | seq_printf(p, " %-8s", irqd_is_level_type(&desc->irq_data) ? "Level" : "Edge"); |
471 | #endif |
472 | if (desc->name) |
473 | seq_printf(p, "-%-8s", desc->name); |
474 | |
475 | if (action) { |
476 | seq_printf(p, " %s", action->name); |
477 | while ((action = action->next) != NULL) |
478 | seq_printf(p, ", %s", action->name); |
479 | } |
480 | |
481 | seq_putc(p, '\n'); |
482 | out: |
483 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
484 | return 0; |
485 | } |
486 | #endif |
487 |
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