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Linux/kernel/irq/proc.c

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  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/seq_file.h>
 12 #include <linux/interrupt.h>
 13 
 14 #include "internals.h"
 15 
 16 static struct proc_dir_entry *root_irq_dir;
 17 
 18 #ifdef CONFIG_SMP
 19 
 20 static int irq_affinity_proc_show(struct seq_file *m, void *v)
 21 {
 22         struct irq_desc *desc = irq_to_desc((long)m->private);
 23         const struct cpumask *mask = desc->affinity;
 24 
 25 #ifdef CONFIG_GENERIC_PENDING_IRQ
 26         if (desc->status & IRQ_MOVE_PENDING)
 27                 mask = desc->pending_mask;
 28 #endif
 29         seq_cpumask(m, mask);
 30         seq_putc(m, '\n');
 31         return 0;
 32 }
 33 
 34 #ifndef is_affinity_mask_valid
 35 #define is_affinity_mask_valid(val) 1
 36 #endif
 37 
 38 int no_irq_affinity;
 39 static ssize_t irq_affinity_proc_write(struct file *file,
 40                 const char __user *buffer, size_t count, loff_t *pos)
 41 {
 42         unsigned int irq = (int)(long)PDE(file->f_path.dentry->d_inode)->data;
 43         cpumask_var_t new_value;
 44         int err;
 45 
 46         if (!irq_to_desc(irq)->chip->set_affinity || no_irq_affinity ||
 47             irq_balancing_disabled(irq))
 48                 return -EIO;
 49 
 50         if (!alloc_cpumask_var(&new_value, GFP_KERNEL))
 51                 return -ENOMEM;
 52 
 53         err = cpumask_parse_user(buffer, count, new_value);
 54         if (err)
 55                 goto free_cpumask;
 56 
 57         if (!is_affinity_mask_valid(new_value)) {
 58                 err = -EINVAL;
 59                 goto free_cpumask;
 60         }
 61 
 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          */
 67         if (!cpumask_intersects(new_value, cpu_online_mask)) {
 68                 /* Special case for empty set - allow the architecture
 69                    code to set default SMP affinity. */
 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;
 79 }
 80 
 81 static int irq_affinity_proc_open(struct inode *inode, struct file *file)
 82 {
 83         return single_open(file, irq_affinity_proc_show, PDE(inode)->data);
 84 }
 85 
 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 {
 96         seq_cpumask(m, irq_default_affinity);
 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 {
104         cpumask_var_t new_value;
105         int err;
106 
107         if (!alloc_cpumask_var(&new_value, GFP_KERNEL))
108                 return -ENOMEM;
109 
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         }
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          */
124         if (!cpumask_intersects(new_value, cpu_online_mask)) {
125                 err = -EINVAL;
126                 goto out;
127         }
128 
129         cpumask_copy(irq_default_affinity, new_value);
130         err = count;
131 
132 out:
133         free_cpumask_var(new_value);
134         return err;
135 }
136 
137 static int default_affinity_open(struct inode *inode, struct file *file)
138 {
139         return single_open(file, default_affinity_show, NULL);
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 };
149 #endif
150 
151 static int irq_spurious_read(char *page, char **start, off_t off,
152                                   int count, int *eof, void *data)
153 {
154         struct irq_desc *desc = irq_to_desc((long) data);
155         return sprintf(page, "count %u\n"
156                              "unhandled %u\n"
157                              "last_unhandled %u ms\n",
158                         desc->irq_count,
159                         desc->irqs_unhandled,
160                         jiffies_to_msecs(desc->last_unhandled));
161 }
162 
163 #define MAX_NAMELEN 128
164 
165 static int name_unique(unsigned int irq, struct irqaction *new_action)
166 {
167         struct irq_desc *desc = irq_to_desc(irq);
168         struct irqaction *action;
169         unsigned long flags;
170         int ret = 1;
171 
172         spin_lock_irqsave(&desc->lock, flags);
173         for (action = desc->action ; action; action = action->next) {
174                 if ((action != new_action) && action->name &&
175                                 !strcmp(new_action->name, action->name)) {
176                         ret = 0;
177                         break;
178                 }
179         }
180         spin_unlock_irqrestore(&desc->lock, flags);
181         return ret;
182 }
183 
184 void register_handler_proc(unsigned int irq, struct irqaction *action)
185 {
186         char name [MAX_NAMELEN];
187         struct irq_desc *desc = irq_to_desc(irq);
188 
189         if (!desc->dir || action->dir || !action->name ||
190                                         !name_unique(irq, action))
191                 return;
192 
193         memset(name, 0, MAX_NAMELEN);
194         snprintf(name, MAX_NAMELEN, "%s", action->name);
195 
196         /* create /proc/irq/1234/handler/ */
197         action->dir = proc_mkdir(name, desc->dir);
198 }
199 
200 #undef MAX_NAMELEN
201 
202 #define MAX_NAMELEN 10
203 
204 void register_irq_proc(unsigned int irq, struct irq_desc *desc)
205 {
206         char name [MAX_NAMELEN];
207         struct proc_dir_entry *entry;
208 
209         if (!root_irq_dir || (desc->chip == &no_irq_chip) || desc->dir)
210                 return;
211 
212         memset(name, 0, MAX_NAMELEN);
213         sprintf(name, "%d", irq);
214 
215         /* create /proc/irq/1234 */
216         desc->dir = proc_mkdir(name, root_irq_dir);
217 
218 #ifdef CONFIG_SMP
219         /* create /proc/irq/<irq>/smp_affinity */
220         proc_create_data("smp_affinity", 0600, desc->dir,
221                          &irq_affinity_proc_fops, (void *)(long)irq);
222 #endif
223 
224         entry = create_proc_entry("spurious", 0444, desc->dir);
225         if (entry) {
226                 entry->data = (void *)(long)irq;
227                 entry->read_proc = irq_spurious_read;
228         }
229 }
230 
231 #undef MAX_NAMELEN
232 
233 void unregister_handler_proc(unsigned int irq, struct irqaction *action)
234 {
235         if (action->dir) {
236                 struct irq_desc *desc = irq_to_desc(irq);
237 
238                 remove_proc_entry(action->dir->name, desc->dir);
239         }
240 }
241 
242 static void register_default_affinity_proc(void)
243 {
244 #ifdef CONFIG_SMP
245         proc_create("irq/default_smp_affinity", 0600, NULL,
246                     &default_affinity_proc_fops);
247 #endif
248 }
249 
250 void init_irq_proc(void)
251 {
252         unsigned int irq;
253         struct irq_desc *desc;
254 
255         /* create /proc/irq */
256         root_irq_dir = proc_mkdir("irq", NULL);
257         if (!root_irq_dir)
258                 return;
259 
260         register_default_affinity_proc();
261 
262         /*
263          * Create entries for all existing IRQs.
264          */
265         for_each_irq_desc(irq, desc) {
266                 if (!desc)
267                         continue;
268 
269                 register_irq_proc(irq, desc);
270         }
271 }
272 
273 

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