64e3df6ab1efdd32b9ea8088b4b565d536548b0c
[linux-2.6.git] / kernel / irq / proc.c
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("node", desc->dir);
356 #endif
357         remove_proc_entry("spurious", desc->dir);
358
359         memset(name, 0, MAX_NAMELEN);
360         sprintf(name, "%u", irq);
361         remove_proc_entry(name, root_irq_dir);
362 }
363
364 #undef MAX_NAMELEN
365
366 void unregister_handler_proc(unsigned int irq, struct irqaction *action)
367 {
368         if (action->dir) {
369                 struct irq_desc *desc = irq_to_desc(irq);
370
371                 remove_proc_entry(action->dir->name, desc->dir);
372         }
373 }
374
375 static void register_default_affinity_proc(void)
376 {
377 #ifdef CONFIG_SMP
378         proc_create("irq/default_smp_affinity", 0600, NULL,
379                     &default_affinity_proc_fops);
380 #endif
381 }
382
383 void init_irq_proc(void)
384 {
385         unsigned int irq;
386         struct irq_desc *desc;
387
388         /* create /proc/irq */
389         root_irq_dir = proc_mkdir("irq", NULL);
390         if (!root_irq_dir)
391                 return;
392
393         register_default_affinity_proc();
394
395         /*
396          * Create entries for all existing IRQs.
397          */
398         for_each_irq_desc(irq, desc) {
399                 if (!desc)
400                         continue;
401
402                 register_irq_proc(irq, desc);
403         }
404 }
405
406 #ifdef CONFIG_GENERIC_IRQ_SHOW
407
408 int __weak arch_show_interrupts(struct seq_file *p, int prec)
409 {
410         return 0;
411 }
412
413 #ifndef ACTUAL_NR_IRQS
414 # define ACTUAL_NR_IRQS nr_irqs
415 #endif
416
417 int show_interrupts(struct seq_file *p, void *v)
418 {
419         static int prec;
420
421         unsigned long flags, any_count = 0;
422         int i = *(loff_t *) v, j;
423         struct irqaction *action;
424         struct irq_desc *desc;
425
426         if (i > ACTUAL_NR_IRQS)
427                 return 0;
428
429         if (i == ACTUAL_NR_IRQS)
430                 return arch_show_interrupts(p, prec);
431
432         /* print header and calculate the width of the first column */
433         if (i == 0) {
434                 for (prec = 3, j = 1000; prec < 10 && j <= nr_irqs; ++prec)
435                         j *= 10;
436
437                 seq_printf(p, "%*s", prec + 8, "");
438                 for_each_online_cpu(j)
439                         seq_printf(p, "CPU%-8d", j);
440                 seq_putc(p, '\n');
441         }
442
443         desc = irq_to_desc(i);
444         if (!desc)
445                 return 0;
446
447         raw_spin_lock_irqsave(&desc->lock, flags);
448         for_each_online_cpu(j)
449                 any_count |= kstat_irqs_cpu(i, j);
450         action = desc->action;
451         if (!action && !any_count)
452                 goto out;
453
454         seq_printf(p, "%*d: ", prec, i);
455         for_each_online_cpu(j)
456                 seq_printf(p, "%10u ", kstat_irqs_cpu(i, j));
457
458         if (desc->irq_data.chip) {
459                 if (desc->irq_data.chip->irq_print_chip)
460                         desc->irq_data.chip->irq_print_chip(&desc->irq_data, p);
461                 else if (desc->irq_data.chip->name)
462                         seq_printf(p, " %8s", desc->irq_data.chip->name);
463                 else
464                         seq_printf(p, " %8s", "-");
465         } else {
466                 seq_printf(p, " %8s", "None");
467         }
468 #ifdef CONFIG_GENERIC_IRQ_SHOW_LEVEL
469         seq_printf(p, " %-8s", irqd_is_level_type(&desc->irq_data) ? "Level" : "Edge");
470 #endif
471         if (desc->name)
472                 seq_printf(p, "-%-8s", desc->name);
473
474         if (action) {
475                 seq_printf(p, "  %s", action->name);
476                 while ((action = action->next) != NULL)
477                         seq_printf(p, ", %s", action->name);
478         }
479
480         seq_putc(p, '\n');
481 out:
482         raw_spin_unlock_irqrestore(&desc->lock, flags);
483         return 0;
484 }
485 #endif