Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Alexey Dobriyan | f18e439 | 2008-08-12 15:09:03 -0700 | [diff] [blame] | 11 | #include <linux/seq_file.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | #include <linux/interrupt.h> |
| 13 | |
Adrian Bunk | 97a41e2 | 2006-01-08 01:02:17 -0800 | [diff] [blame] | 14 | #include "internals.h" |
| 15 | |
Ingo Molnar | 4a733ee | 2006-06-29 02:24:42 -0700 | [diff] [blame] | 16 | static struct proc_dir_entry *root_irq_dir; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | |
| 18 | #ifdef CONFIG_SMP |
| 19 | |
Alexey Dobriyan | f18e439 | 2008-08-12 15:09:03 -0700 | [diff] [blame] | 20 | static int irq_affinity_proc_show(struct seq_file *m, void *v) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | { |
Yinghai Lu | 08678b0 | 2008-08-19 20:50:05 -0700 | [diff] [blame] | 22 | struct irq_desc *desc = irq_to_desc((long)m->private); |
Mike Travis | 7f7ace0 | 2009-01-10 21:58:08 -0800 | [diff] [blame] | 23 | const struct cpumask *mask = desc->affinity; |
Andi Kleen | 42ee2b7 | 2007-07-21 17:09:54 +0200 | [diff] [blame] | 24 | |
| 25 | #ifdef CONFIG_GENERIC_PENDING_IRQ |
| 26 | if (desc->status & IRQ_MOVE_PENDING) |
Mike Travis | 7f7ace0 | 2009-01-10 21:58:08 -0800 | [diff] [blame] | 27 | mask = desc->pending_mask; |
Andi Kleen | 42ee2b7 | 2007-07-21 17:09:54 +0200 | [diff] [blame] | 28 | #endif |
Alexey Dobriyan | f18e439 | 2008-08-12 15:09:03 -0700 | [diff] [blame] | 29 | seq_cpumask(m, mask); |
| 30 | seq_putc(m, '\n'); |
| 31 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | } |
| 33 | |
John Keller | 25d6157 | 2007-05-10 22:42:44 -0700 | [diff] [blame] | 34 | #ifndef is_affinity_mask_valid |
| 35 | #define is_affinity_mask_valid(val) 1 |
| 36 | #endif |
| 37 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | int no_irq_affinity; |
Alexey Dobriyan | f18e439 | 2008-08-12 15:09:03 -0700 | [diff] [blame] | 39 | static ssize_t irq_affinity_proc_write(struct file *file, |
| 40 | const char __user *buffer, size_t count, loff_t *pos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | { |
Alexey Dobriyan | f18e439 | 2008-08-12 15:09:03 -0700 | [diff] [blame] | 42 | unsigned int irq = (int)(long)PDE(file->f_path.dentry->d_inode)->data; |
Rusty Russell | 0de2652 | 2008-12-13 21:20:26 +1030 | [diff] [blame] | 43 | cpumask_var_t new_value; |
Alexey Dobriyan | f18e439 | 2008-08-12 15:09:03 -0700 | [diff] [blame] | 44 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | |
Yinghai Lu | 08678b0 | 2008-08-19 20:50:05 -0700 | [diff] [blame] | 46 | if (!irq_to_desc(irq)->chip->set_affinity || no_irq_affinity || |
Thomas Gleixner | 950f442 | 2007-02-16 01:27:24 -0800 | [diff] [blame] | 47 | irq_balancing_disabled(irq)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | return -EIO; |
| 49 | |
Rusty Russell | 0de2652 | 2008-12-13 21:20:26 +1030 | [diff] [blame] | 50 | if (!alloc_cpumask_var(&new_value, GFP_KERNEL)) |
| 51 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | |
Rusty Russell | 0de2652 | 2008-12-13 21:20:26 +1030 | [diff] [blame] | 53 | err = cpumask_parse_user(buffer, count, new_value); |
| 54 | if (err) |
| 55 | goto free_cpumask; |
| 56 | |
Ingo Molnar | 6bdf197 | 2009-01-03 12:50:46 +0100 | [diff] [blame] | 57 | if (!is_affinity_mask_valid(new_value)) { |
Rusty Russell | 0de2652 | 2008-12-13 21:20:26 +1030 | [diff] [blame] | 58 | err = -EINVAL; |
| 59 | goto free_cpumask; |
| 60 | } |
John Keller | 25d6157 | 2007-05-10 22:42:44 -0700 | [diff] [blame] | 61 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
Rusty Russell | 0de2652 | 2008-12-13 21:20:26 +1030 | [diff] [blame] | 67 | if (!cpumask_intersects(new_value, cpu_online_mask)) { |
Ivan Kokshaysky | eee4526 | 2006-01-06 00:12:21 -0800 | [diff] [blame] | 68 | /* Special case for empty set - allow the architecture |
| 69 | code to set default SMP affinity. */ |
Rusty Russell | 0de2652 | 2008-12-13 21:20:26 +1030 | [diff] [blame] | 70 | err = irq_select_affinity_usr(irq) ? -EINVAL : count; |
| 71 | } else { |
| 72 | irq_set_affinity(irq, new_value); |
| 73 | err = count; |
| 74 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | |
Rusty Russell | 0de2652 | 2008-12-13 21:20:26 +1030 | [diff] [blame] | 76 | free_cpumask: |
| 77 | free_cpumask_var(new_value); |
| 78 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | } |
| 80 | |
Alexey Dobriyan | f18e439 | 2008-08-12 15:09:03 -0700 | [diff] [blame] | 81 | static int irq_affinity_proc_open(struct inode *inode, struct file *file) |
Max Krasnyansky | 1840475 | 2008-05-29 11:02:52 -0700 | [diff] [blame] | 82 | { |
Alexey Dobriyan | f18e439 | 2008-08-12 15:09:03 -0700 | [diff] [blame] | 83 | return single_open(file, irq_affinity_proc_show, PDE(inode)->data); |
Max Krasnyansky | 1840475 | 2008-05-29 11:02:52 -0700 | [diff] [blame] | 84 | } |
| 85 | |
Alexey Dobriyan | f18e439 | 2008-08-12 15:09:03 -0700 | [diff] [blame] | 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) |
Max Krasnyansky | 1840475 | 2008-05-29 11:02:52 -0700 | [diff] [blame] | 95 | { |
Rusty Russell | d036e67 | 2009-01-01 10:12:26 +1030 | [diff] [blame] | 96 | seq_cpumask(m, irq_default_affinity); |
Alexey Dobriyan | f18e439 | 2008-08-12 15:09:03 -0700 | [diff] [blame] | 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) |
| 103 | { |
Rusty Russell | d036e67 | 2009-01-01 10:12:26 +1030 | [diff] [blame] | 104 | cpumask_var_t new_value; |
Alexey Dobriyan | f18e439 | 2008-08-12 15:09:03 -0700 | [diff] [blame] | 105 | int err; |
Max Krasnyansky | 1840475 | 2008-05-29 11:02:52 -0700 | [diff] [blame] | 106 | |
Rusty Russell | d036e67 | 2009-01-01 10:12:26 +1030 | [diff] [blame] | 107 | if (!alloc_cpumask_var(&new_value, GFP_KERNEL)) |
| 108 | return -ENOMEM; |
Max Krasnyansky | 1840475 | 2008-05-29 11:02:52 -0700 | [diff] [blame] | 109 | |
Rusty Russell | d036e67 | 2009-01-01 10:12:26 +1030 | [diff] [blame] | 110 | err = cpumask_parse_user(buffer, count, new_value); |
| 111 | if (err) |
| 112 | goto out; |
| 113 | |
| 114 | if (!is_affinity_mask_valid(new_value)) { |
| 115 | err = -EINVAL; |
| 116 | goto out; |
| 117 | } |
Max Krasnyansky | 1840475 | 2008-05-29 11:02:52 -0700 | [diff] [blame] | 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 | */ |
Rusty Russell | d036e67 | 2009-01-01 10:12:26 +1030 | [diff] [blame] | 124 | if (!cpumask_intersects(new_value, cpu_online_mask)) { |
| 125 | err = -EINVAL; |
| 126 | goto out; |
| 127 | } |
Max Krasnyansky | 1840475 | 2008-05-29 11:02:52 -0700 | [diff] [blame] | 128 | |
Rusty Russell | d036e67 | 2009-01-01 10:12:26 +1030 | [diff] [blame] | 129 | cpumask_copy(irq_default_affinity, new_value); |
| 130 | err = count; |
Max Krasnyansky | 1840475 | 2008-05-29 11:02:52 -0700 | [diff] [blame] | 131 | |
Rusty Russell | d036e67 | 2009-01-01 10:12:26 +1030 | [diff] [blame] | 132 | out: |
| 133 | free_cpumask_var(new_value); |
| 134 | return err; |
Max Krasnyansky | 1840475 | 2008-05-29 11:02:52 -0700 | [diff] [blame] | 135 | } |
Alexey Dobriyan | f18e439 | 2008-08-12 15:09:03 -0700 | [diff] [blame] | 136 | |
| 137 | static int default_affinity_open(struct inode *inode, struct file *file) |
| 138 | { |
Thomas Gleixner | 3476994 | 2009-11-20 11:46:21 +0100 | [diff] [blame] | 139 | return single_open(file, default_affinity_show, PDE(inode)->data); |
Alexey Dobriyan | f18e439 | 2008-08-12 15:09:03 -0700 | [diff] [blame] | 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 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | #endif |
| 150 | |
Alexey Dobriyan | a1afb63 | 2009-08-28 22:19:33 +0400 | [diff] [blame] | 151 | static int irq_spurious_proc_show(struct seq_file *m, void *v) |
Andi Kleen | 96d97cf | 2008-01-30 13:32:48 +0100 | [diff] [blame] | 152 | { |
Alexey Dobriyan | a1afb63 | 2009-08-28 22:19:33 +0400 | [diff] [blame] | 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; |
Andi Kleen | 96d97cf | 2008-01-30 13:32:48 +0100 | [diff] [blame] | 159 | } |
| 160 | |
Alexey Dobriyan | a1afb63 | 2009-08-28 22:19:33 +0400 | [diff] [blame] | 161 | static int irq_spurious_proc_open(struct inode *inode, struct file *file) |
| 162 | { |
| 163 | return single_open(file, irq_spurious_proc_show, NULL); |
| 164 | } |
| 165 | |
| 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | #define MAX_NAMELEN 128 |
| 174 | |
| 175 | static int name_unique(unsigned int irq, struct irqaction *new_action) |
| 176 | { |
Yinghai Lu | 08678b0 | 2008-08-19 20:50:05 -0700 | [diff] [blame] | 177 | struct irq_desc *desc = irq_to_desc(irq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | struct irqaction *action; |
Dmitry Adamushko | d2d9433 | 2007-05-08 00:27:31 -0700 | [diff] [blame] | 179 | unsigned long flags; |
| 180 | int ret = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | |
Dmitry Adamushko | d2d9433 | 2007-05-08 00:27:31 -0700 | [diff] [blame] | 182 | spin_lock_irqsave(&desc->lock, flags); |
| 183 | for (action = desc->action ; action; action = action->next) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | if ((action != new_action) && action->name && |
Dmitry Adamushko | d2d9433 | 2007-05-08 00:27:31 -0700 | [diff] [blame] | 185 | !strcmp(new_action->name, action->name)) { |
| 186 | ret = 0; |
| 187 | break; |
| 188 | } |
| 189 | } |
| 190 | spin_unlock_irqrestore(&desc->lock, flags); |
| 191 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | } |
| 193 | |
| 194 | void register_handler_proc(unsigned int irq, struct irqaction *action) |
| 195 | { |
| 196 | char name [MAX_NAMELEN]; |
Yinghai Lu | 08678b0 | 2008-08-19 20:50:05 -0700 | [diff] [blame] | 197 | struct irq_desc *desc = irq_to_desc(irq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | |
Yinghai Lu | 08678b0 | 2008-08-19 20:50:05 -0700 | [diff] [blame] | 199 | if (!desc->dir || action->dir || !action->name || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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/ */ |
Yinghai Lu | 08678b0 | 2008-08-19 20:50:05 -0700 | [diff] [blame] | 207 | action->dir = proc_mkdir(name, desc->dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | } |
| 209 | |
| 210 | #undef MAX_NAMELEN |
| 211 | |
| 212 | #define MAX_NAMELEN 10 |
| 213 | |
Yinghai Lu | 2c6927a | 2008-08-19 20:50:11 -0700 | [diff] [blame] | 214 | void register_irq_proc(unsigned int irq, struct irq_desc *desc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | { |
| 216 | char name [MAX_NAMELEN]; |
| 217 | |
Yinghai Lu | 08678b0 | 2008-08-19 20:50:05 -0700 | [diff] [blame] | 218 | if (!root_irq_dir || (desc->chip == &no_irq_chip) || desc->dir) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | return; |
| 220 | |
| 221 | memset(name, 0, MAX_NAMELEN); |
| 222 | sprintf(name, "%d", irq); |
| 223 | |
| 224 | /* create /proc/irq/1234 */ |
Yinghai Lu | 08678b0 | 2008-08-19 20:50:05 -0700 | [diff] [blame] | 225 | desc->dir = proc_mkdir(name, root_irq_dir); |
Cyrill Gorcunov | c82a43d | 2009-10-26 23:28:11 +0300 | [diff] [blame] | 226 | if (!desc->dir) |
| 227 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | |
| 229 | #ifdef CONFIG_SMP |
Alexey Dobriyan | f18e439 | 2008-08-12 15:09:03 -0700 | [diff] [blame] | 230 | /* create /proc/irq/<irq>/smp_affinity */ |
Yinghai Lu | 08678b0 | 2008-08-19 20:50:05 -0700 | [diff] [blame] | 231 | proc_create_data("smp_affinity", 0600, desc->dir, |
Alexey Dobriyan | f18e439 | 2008-08-12 15:09:03 -0700 | [diff] [blame] | 232 | &irq_affinity_proc_fops, (void *)(long)irq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | #endif |
Andi Kleen | 96d97cf | 2008-01-30 13:32:48 +0100 | [diff] [blame] | 234 | |
Alexey Dobriyan | a1afb63 | 2009-08-28 22:19:33 +0400 | [diff] [blame] | 235 | proc_create_data("spurious", 0444, desc->dir, |
| 236 | &irq_spurious_proc_fops, (void *)(long)irq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | } |
| 238 | |
| 239 | #undef MAX_NAMELEN |
| 240 | |
| 241 | void unregister_handler_proc(unsigned int irq, struct irqaction *action) |
| 242 | { |
Yinghai Lu | 08678b0 | 2008-08-19 20:50:05 -0700 | [diff] [blame] | 243 | if (action->dir) { |
| 244 | struct irq_desc *desc = irq_to_desc(irq); |
Thomas Gleixner | d3c6004 | 2008-10-16 09:55:00 +0200 | [diff] [blame] | 245 | |
Yinghai Lu | 08678b0 | 2008-08-19 20:50:05 -0700 | [diff] [blame] | 246 | remove_proc_entry(action->dir->name, desc->dir); |
| 247 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | } |
| 249 | |
roel kluin | 3786fc7 | 2008-10-21 19:49:09 -0400 | [diff] [blame] | 250 | static void register_default_affinity_proc(void) |
Max Krasnyansky | 1840475 | 2008-05-29 11:02:52 -0700 | [diff] [blame] | 251 | { |
| 252 | #ifdef CONFIG_SMP |
Alexey Dobriyan | f18e439 | 2008-08-12 15:09:03 -0700 | [diff] [blame] | 253 | proc_create("irq/default_smp_affinity", 0600, NULL, |
| 254 | &default_affinity_proc_fops); |
Max Krasnyansky | 1840475 | 2008-05-29 11:02:52 -0700 | [diff] [blame] | 255 | #endif |
| 256 | } |
| 257 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | void init_irq_proc(void) |
| 259 | { |
Yinghai Lu | 2c6927a | 2008-08-19 20:50:11 -0700 | [diff] [blame] | 260 | unsigned int irq; |
| 261 | struct irq_desc *desc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | |
| 263 | /* create /proc/irq */ |
| 264 | root_irq_dir = proc_mkdir("irq", NULL); |
| 265 | if (!root_irq_dir) |
| 266 | return; |
| 267 | |
Max Krasnyansky | 1840475 | 2008-05-29 11:02:52 -0700 | [diff] [blame] | 268 | register_default_affinity_proc(); |
| 269 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | /* |
| 271 | * Create entries for all existing IRQs. |
| 272 | */ |
Yinghai Lu | 0b8f1ef | 2008-12-05 18:58:31 -0800 | [diff] [blame] | 273 | for_each_irq_desc(irq, desc) { |
| 274 | if (!desc) |
| 275 | continue; |
| 276 | |
Yinghai Lu | 2c6927a | 2008-08-19 20:50:11 -0700 | [diff] [blame] | 277 | register_irq_proc(irq, desc); |
Yinghai Lu | 0b8f1ef | 2008-12-05 18:58:31 -0800 | [diff] [blame] | 278 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | } |
| 280 | |