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