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Commit | Line | Data |
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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> | |
11 | #include <linux/interrupt.h> | |
12 | ||
97a41e26 AB |
13 | #include "internals.h" |
14 | ||
1da177e4 LT |
15 | static struct proc_dir_entry *root_irq_dir, *irq_dir[NR_IRQS]; |
16 | ||
17 | #ifdef CONFIG_SMP | |
18 | ||
19 | /* | |
20 | * The /proc/irq/<irq>/smp_affinity values: | |
21 | */ | |
22 | static struct proc_dir_entry *smp_affinity_entry[NR_IRQS]; | |
23 | ||
54d5d424 AR |
24 | #ifdef CONFIG_GENERIC_PENDING_IRQ |
25 | void proc_set_irq_affinity(unsigned int irq, cpumask_t mask_val) | |
26 | { | |
1b61b910 ZY |
27 | set_balance_irq_affinity(irq, mask_val); |
28 | ||
54d5d424 AR |
29 | /* |
30 | * Save these away for later use. Re-progam when the | |
31 | * interrupt is pending | |
32 | */ | |
33 | set_pending_irq(irq, mask_val); | |
34 | } | |
35 | #else | |
36 | void proc_set_irq_affinity(unsigned int irq, cpumask_t mask_val) | |
1da177e4 | 37 | { |
1b61b910 | 38 | set_balance_irq_affinity(irq, mask_val); |
1da177e4 | 39 | irq_affinity[irq] = mask_val; |
d1bef4ed | 40 | irq_desc[irq].chip->set_affinity(irq, mask_val); |
1da177e4 | 41 | } |
54d5d424 | 42 | #endif |
1da177e4 LT |
43 | |
44 | static int irq_affinity_read_proc(char *page, char **start, off_t off, | |
45 | int count, int *eof, void *data) | |
46 | { | |
47 | int len = cpumask_scnprintf(page, count, irq_affinity[(long)data]); | |
48 | ||
49 | if (count - len < 2) | |
50 | return -EINVAL; | |
51 | len += sprintf(page + len, "\n"); | |
52 | return len; | |
53 | } | |
54 | ||
55 | int no_irq_affinity; | |
56 | static int irq_affinity_write_proc(struct file *file, const char __user *buffer, | |
57 | unsigned long count, void *data) | |
58 | { | |
59 | unsigned int irq = (int)(long)data, full_count = count, err; | |
60 | cpumask_t new_value, tmp; | |
61 | ||
d1bef4ed | 62 | if (!irq_desc[irq].chip->set_affinity || no_irq_affinity) |
1da177e4 LT |
63 | return -EIO; |
64 | ||
65 | err = cpumask_parse(buffer, count, new_value); | |
66 | if (err) | |
67 | return err; | |
68 | ||
69 | /* | |
70 | * Do not allow disabling IRQs completely - it's a too easy | |
71 | * way to make the system unusable accidentally :-) At least | |
72 | * one online CPU still has to be targeted. | |
73 | */ | |
74 | cpus_and(tmp, new_value, cpu_online_map); | |
75 | if (cpus_empty(tmp)) | |
eee45269 IK |
76 | /* Special case for empty set - allow the architecture |
77 | code to set default SMP affinity. */ | |
78 | return select_smp_affinity(irq) ? -EINVAL : full_count; | |
1da177e4 LT |
79 | |
80 | proc_set_irq_affinity(irq, new_value); | |
81 | ||
82 | return full_count; | |
83 | } | |
84 | ||
85 | #endif | |
86 | ||
87 | #define MAX_NAMELEN 128 | |
88 | ||
89 | static int name_unique(unsigned int irq, struct irqaction *new_action) | |
90 | { | |
91 | struct irq_desc *desc = irq_desc + irq; | |
92 | struct irqaction *action; | |
93 | ||
94 | for (action = desc->action ; action; action = action->next) | |
95 | if ((action != new_action) && action->name && | |
96 | !strcmp(new_action->name, action->name)) | |
97 | return 0; | |
98 | return 1; | |
99 | } | |
100 | ||
101 | void register_handler_proc(unsigned int irq, struct irqaction *action) | |
102 | { | |
103 | char name [MAX_NAMELEN]; | |
104 | ||
105 | if (!irq_dir[irq] || action->dir || !action->name || | |
106 | !name_unique(irq, action)) | |
107 | return; | |
108 | ||
109 | memset(name, 0, MAX_NAMELEN); | |
110 | snprintf(name, MAX_NAMELEN, "%s", action->name); | |
111 | ||
112 | /* create /proc/irq/1234/handler/ */ | |
113 | action->dir = proc_mkdir(name, irq_dir[irq]); | |
114 | } | |
115 | ||
116 | #undef MAX_NAMELEN | |
117 | ||
118 | #define MAX_NAMELEN 10 | |
119 | ||
120 | void register_irq_proc(unsigned int irq) | |
121 | { | |
122 | char name [MAX_NAMELEN]; | |
123 | ||
124 | if (!root_irq_dir || | |
d1bef4ed | 125 | (irq_desc[irq].chip == &no_irq_type) || |
1da177e4 LT |
126 | irq_dir[irq]) |
127 | return; | |
128 | ||
129 | memset(name, 0, MAX_NAMELEN); | |
130 | sprintf(name, "%d", irq); | |
131 | ||
132 | /* create /proc/irq/1234 */ | |
133 | irq_dir[irq] = proc_mkdir(name, root_irq_dir); | |
134 | ||
135 | #ifdef CONFIG_SMP | |
136 | { | |
137 | struct proc_dir_entry *entry; | |
138 | ||
139 | /* create /proc/irq/<irq>/smp_affinity */ | |
140 | entry = create_proc_entry("smp_affinity", 0600, irq_dir[irq]); | |
141 | ||
142 | if (entry) { | |
143 | entry->nlink = 1; | |
144 | entry->data = (void *)(long)irq; | |
145 | entry->read_proc = irq_affinity_read_proc; | |
146 | entry->write_proc = irq_affinity_write_proc; | |
147 | } | |
148 | smp_affinity_entry[irq] = entry; | |
149 | } | |
150 | #endif | |
151 | } | |
152 | ||
153 | #undef MAX_NAMELEN | |
154 | ||
155 | void unregister_handler_proc(unsigned int irq, struct irqaction *action) | |
156 | { | |
157 | if (action->dir) | |
158 | remove_proc_entry(action->dir->name, irq_dir[irq]); | |
159 | } | |
160 | ||
161 | void init_irq_proc(void) | |
162 | { | |
163 | int i; | |
164 | ||
165 | /* create /proc/irq */ | |
166 | root_irq_dir = proc_mkdir("irq", NULL); | |
167 | if (!root_irq_dir) | |
168 | return; | |
169 | ||
170 | /* | |
171 | * Create entries for all existing IRQs. | |
172 | */ | |
173 | for (i = 0; i < NR_IRQS; i++) | |
174 | register_irq_proc(i); | |
175 | } | |
176 |