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> | |
10 | #include <linux/proc_fs.h> | |
f18e439d | 11 | #include <linux/seq_file.h> |
1da177e4 LT |
12 | #include <linux/interrupt.h> |
13 | ||
97a41e26 AB |
14 | #include "internals.h" |
15 | ||
4a733ee1 | 16 | static struct proc_dir_entry *root_irq_dir; |
1da177e4 LT |
17 | |
18 | #ifdef CONFIG_SMP | |
19 | ||
f18e439d | 20 | static int irq_affinity_proc_show(struct seq_file *m, void *v) |
1da177e4 | 21 | { |
08678b08 | 22 | struct irq_desc *desc = irq_to_desc((long)m->private); |
7f7ace0c | 23 | const struct cpumask *mask = desc->affinity; |
42ee2b74 AK |
24 | |
25 | #ifdef CONFIG_GENERIC_PENDING_IRQ | |
26 | if (desc->status & IRQ_MOVE_PENDING) | |
7f7ace0c | 27 | mask = desc->pending_mask; |
42ee2b74 | 28 | #endif |
f18e439d AD |
29 | seq_cpumask(m, mask); |
30 | seq_putc(m, '\n'); | |
31 | return 0; | |
1da177e4 LT |
32 | } |
33 | ||
25d61578 JK |
34 | #ifndef is_affinity_mask_valid |
35 | #define is_affinity_mask_valid(val) 1 | |
36 | #endif | |
37 | ||
1da177e4 | 38 | int no_irq_affinity; |
f18e439d AD |
39 | static ssize_t irq_affinity_proc_write(struct file *file, |
40 | const char __user *buffer, size_t count, loff_t *pos) | |
1da177e4 | 41 | { |
f18e439d | 42 | unsigned int irq = (int)(long)PDE(file->f_path.dentry->d_inode)->data; |
0de26520 | 43 | cpumask_var_t new_value; |
f18e439d | 44 | int err; |
1da177e4 | 45 | |
08678b08 | 46 | if (!irq_to_desc(irq)->chip->set_affinity || no_irq_affinity || |
950f4427 | 47 | irq_balancing_disabled(irq)) |
1da177e4 LT |
48 | return -EIO; |
49 | ||
0de26520 RR |
50 | if (!alloc_cpumask_var(&new_value, GFP_KERNEL)) |
51 | return -ENOMEM; | |
52 | ||
53 | err = cpumask_parse_user(buffer, count, new_value); | |
1da177e4 | 54 | if (err) |
0de26520 | 55 | goto free_cpumask; |
1da177e4 | 56 | |
6bdf197b | 57 | if (!is_affinity_mask_valid(new_value)) { |
0de26520 RR |
58 | err = -EINVAL; |
59 | goto free_cpumask; | |
60 | } | |
25d61578 | 61 | |
1da177e4 LT |
62 | /* |
63 | * Do not allow disabling IRQs completely - it's a too easy | |
64 | * way to make the system unusable accidentally :-) At least | |
65 | * one online CPU still has to be targeted. | |
66 | */ | |
0de26520 | 67 | if (!cpumask_intersects(new_value, cpu_online_mask)) { |
eee45269 IK |
68 | /* Special case for empty set - allow the architecture |
69 | code to set default SMP affinity. */ | |
0de26520 RR |
70 | err = irq_select_affinity_usr(irq) ? -EINVAL : count; |
71 | } else { | |
72 | irq_set_affinity(irq, new_value); | |
73 | err = count; | |
74 | } | |
75 | ||
76 | free_cpumask: | |
77 | free_cpumask_var(new_value); | |
78 | return err; | |
1da177e4 LT |
79 | } |
80 | ||
f18e439d | 81 | static int irq_affinity_proc_open(struct inode *inode, struct file *file) |
18404756 | 82 | { |
f18e439d | 83 | return single_open(file, irq_affinity_proc_show, PDE(inode)->data); |
18404756 MK |
84 | } |
85 | ||
f18e439d AD |
86 | static const struct file_operations irq_affinity_proc_fops = { |
87 | .open = irq_affinity_proc_open, | |
88 | .read = seq_read, | |
89 | .llseek = seq_lseek, | |
90 | .release = single_release, | |
91 | .write = irq_affinity_proc_write, | |
92 | }; | |
93 | ||
94 | static int default_affinity_show(struct seq_file *m, void *v) | |
95 | { | |
d036e67b | 96 | seq_cpumask(m, irq_default_affinity); |
f18e439d AD |
97 | seq_putc(m, '\n'); |
98 | return 0; | |
99 | } | |
100 | ||
101 | static ssize_t default_affinity_write(struct file *file, | |
102 | const char __user *buffer, size_t count, loff_t *ppos) | |
18404756 | 103 | { |
d036e67b | 104 | cpumask_var_t new_value; |
f18e439d | 105 | int err; |
18404756 | 106 | |
d036e67b RR |
107 | if (!alloc_cpumask_var(&new_value, GFP_KERNEL)) |
108 | return -ENOMEM; | |
109 | ||
110 | err = cpumask_parse_user(buffer, count, new_value); | |
18404756 | 111 | if (err) |
d036e67b | 112 | goto out; |
18404756 | 113 | |
d036e67b RR |
114 | if (!is_affinity_mask_valid(new_value)) { |
115 | err = -EINVAL; | |
116 | goto out; | |
117 | } | |
18404756 MK |
118 | |
119 | /* | |
120 | * Do not allow disabling IRQs completely - it's a too easy | |
121 | * way to make the system unusable accidentally :-) At least | |
122 | * one online CPU still has to be targeted. | |
123 | */ | |
d036e67b RR |
124 | if (!cpumask_intersects(new_value, cpu_online_mask)) { |
125 | err = -EINVAL; | |
126 | goto out; | |
127 | } | |
18404756 | 128 | |
d036e67b RR |
129 | cpumask_copy(irq_default_affinity, new_value); |
130 | err = count; | |
18404756 | 131 | |
d036e67b RR |
132 | out: |
133 | free_cpumask_var(new_value); | |
134 | return err; | |
18404756 | 135 | } |
f18e439d AD |
136 | |
137 | static int default_affinity_open(struct inode *inode, struct file *file) | |
138 | { | |
34769945 | 139 | return single_open(file, default_affinity_show, PDE(inode)->data); |
f18e439d AD |
140 | } |
141 | ||
142 | static const struct file_operations default_affinity_proc_fops = { | |
143 | .open = default_affinity_open, | |
144 | .read = seq_read, | |
145 | .llseek = seq_lseek, | |
146 | .release = single_release, | |
147 | .write = default_affinity_write, | |
148 | }; | |
1da177e4 LT |
149 | #endif |
150 | ||
a1afb637 | 151 | static int irq_spurious_proc_show(struct seq_file *m, void *v) |
96d97cf0 | 152 | { |
a1afb637 AD |
153 | struct irq_desc *desc = irq_to_desc((long) m->private); |
154 | ||
155 | seq_printf(m, "count %u\n" "unhandled %u\n" "last_unhandled %u ms\n", | |
156 | desc->irq_count, desc->irqs_unhandled, | |
157 | jiffies_to_msecs(desc->last_unhandled)); | |
158 | return 0; | |
159 | } | |
160 | ||
161 | static int irq_spurious_proc_open(struct inode *inode, struct file *file) | |
162 | { | |
163 | return single_open(file, irq_spurious_proc_show, NULL); | |
96d97cf0 AK |
164 | } |
165 | ||
a1afb637 AD |
166 | static const struct file_operations irq_spurious_proc_fops = { |
167 | .open = irq_spurious_proc_open, | |
168 | .read = seq_read, | |
169 | .llseek = seq_lseek, | |
170 | .release = single_release, | |
171 | }; | |
172 | ||
1da177e4 LT |
173 | #define MAX_NAMELEN 128 |
174 | ||
175 | static int name_unique(unsigned int irq, struct irqaction *new_action) | |
176 | { | |
08678b08 | 177 | struct irq_desc *desc = irq_to_desc(irq); |
1da177e4 | 178 | struct irqaction *action; |
d2d9433a DA |
179 | unsigned long flags; |
180 | int ret = 1; | |
1da177e4 | 181 | |
239007b8 | 182 | raw_spin_lock_irqsave(&desc->lock, flags); |
d2d9433a | 183 | for (action = desc->action ; action; action = action->next) { |
1da177e4 | 184 | if ((action != new_action) && action->name && |
d2d9433a DA |
185 | !strcmp(new_action->name, action->name)) { |
186 | ret = 0; | |
187 | break; | |
188 | } | |
189 | } | |
239007b8 | 190 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
d2d9433a | 191 | return ret; |
1da177e4 LT |
192 | } |
193 | ||
194 | void register_handler_proc(unsigned int irq, struct irqaction *action) | |
195 | { | |
196 | char name [MAX_NAMELEN]; | |
08678b08 | 197 | struct irq_desc *desc = irq_to_desc(irq); |
1da177e4 | 198 | |
08678b08 | 199 | if (!desc->dir || action->dir || !action->name || |
1da177e4 LT |
200 | !name_unique(irq, action)) |
201 | return; | |
202 | ||
203 | memset(name, 0, MAX_NAMELEN); | |
204 | snprintf(name, MAX_NAMELEN, "%s", action->name); | |
205 | ||
206 | /* create /proc/irq/1234/handler/ */ | |
08678b08 | 207 | action->dir = proc_mkdir(name, desc->dir); |
1da177e4 LT |
208 | } |
209 | ||
210 | #undef MAX_NAMELEN | |
211 | ||
212 | #define MAX_NAMELEN 10 | |
213 | ||
2c6927a3 | 214 | void register_irq_proc(unsigned int irq, struct irq_desc *desc) |
1da177e4 LT |
215 | { |
216 | char name [MAX_NAMELEN]; | |
217 | ||
08678b08 | 218 | if (!root_irq_dir || (desc->chip == &no_irq_chip) || desc->dir) |
1da177e4 LT |
219 | return; |
220 | ||
221 | memset(name, 0, MAX_NAMELEN); | |
222 | sprintf(name, "%d", irq); | |
223 | ||
224 | /* create /proc/irq/1234 */ | |
08678b08 | 225 | desc->dir = proc_mkdir(name, root_irq_dir); |
c82a43d4 CG |
226 | if (!desc->dir) |
227 | return; | |
1da177e4 LT |
228 | |
229 | #ifdef CONFIG_SMP | |
f18e439d | 230 | /* create /proc/irq/<irq>/smp_affinity */ |
08678b08 | 231 | proc_create_data("smp_affinity", 0600, desc->dir, |
f18e439d | 232 | &irq_affinity_proc_fops, (void *)(long)irq); |
1da177e4 | 233 | #endif |
96d97cf0 | 234 | |
a1afb637 AD |
235 | proc_create_data("spurious", 0444, desc->dir, |
236 | &irq_spurious_proc_fops, (void *)(long)irq); | |
1da177e4 LT |
237 | } |
238 | ||
239 | #undef MAX_NAMELEN | |
240 | ||
241 | void unregister_handler_proc(unsigned int irq, struct irqaction *action) | |
242 | { | |
08678b08 YL |
243 | if (action->dir) { |
244 | struct irq_desc *desc = irq_to_desc(irq); | |
d3c60047 | 245 | |
08678b08 YL |
246 | remove_proc_entry(action->dir->name, desc->dir); |
247 | } | |
1da177e4 LT |
248 | } |
249 | ||
3786fc71 | 250 | static void register_default_affinity_proc(void) |
18404756 MK |
251 | { |
252 | #ifdef CONFIG_SMP | |
f18e439d AD |
253 | proc_create("irq/default_smp_affinity", 0600, NULL, |
254 | &default_affinity_proc_fops); | |
18404756 MK |
255 | #endif |
256 | } | |
257 | ||
1da177e4 LT |
258 | void init_irq_proc(void) |
259 | { | |
2c6927a3 YL |
260 | unsigned int irq; |
261 | struct irq_desc *desc; | |
1da177e4 LT |
262 | |
263 | /* create /proc/irq */ | |
264 | root_irq_dir = proc_mkdir("irq", NULL); | |
265 | if (!root_irq_dir) | |
266 | return; | |
267 | ||
18404756 MK |
268 | register_default_affinity_proc(); |
269 | ||
1da177e4 LT |
270 | /* |
271 | * Create entries for all existing IRQs. | |
272 | */ | |
0b8f1efa YL |
273 | for_each_irq_desc(irq, desc) { |
274 | if (!desc) | |
275 | continue; | |
276 | ||
2c6927a3 | 277 | register_irq_proc(irq, desc); |
0b8f1efa | 278 | } |
1da177e4 LT |
279 | } |
280 |