1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
159 lines
3.4 KiB
C
159 lines
3.4 KiB
C
/*
|
|
* linux/kernel/irq/proc.c
|
|
*
|
|
* Copyright (C) 1992, 1998-2004 Linus Torvalds, Ingo Molnar
|
|
*
|
|
* This file contains the /proc/irq/ handling code.
|
|
*/
|
|
|
|
#include <linux/irq.h>
|
|
#include <linux/proc_fs.h>
|
|
#include <linux/interrupt.h>
|
|
|
|
static struct proc_dir_entry *root_irq_dir, *irq_dir[NR_IRQS];
|
|
|
|
#ifdef CONFIG_SMP
|
|
|
|
/*
|
|
* The /proc/irq/<irq>/smp_affinity values:
|
|
*/
|
|
static struct proc_dir_entry *smp_affinity_entry[NR_IRQS];
|
|
|
|
void __attribute__((weak))
|
|
proc_set_irq_affinity(unsigned int irq, cpumask_t mask_val)
|
|
{
|
|
irq_affinity[irq] = mask_val;
|
|
irq_desc[irq].handler->set_affinity(irq, mask_val);
|
|
}
|
|
|
|
static int irq_affinity_read_proc(char *page, char **start, off_t off,
|
|
int count, int *eof, void *data)
|
|
{
|
|
int len = cpumask_scnprintf(page, count, irq_affinity[(long)data]);
|
|
|
|
if (count - len < 2)
|
|
return -EINVAL;
|
|
len += sprintf(page + len, "\n");
|
|
return len;
|
|
}
|
|
|
|
int no_irq_affinity;
|
|
static int irq_affinity_write_proc(struct file *file, const char __user *buffer,
|
|
unsigned long count, void *data)
|
|
{
|
|
unsigned int irq = (int)(long)data, full_count = count, err;
|
|
cpumask_t new_value, tmp;
|
|
|
|
if (!irq_desc[irq].handler->set_affinity || no_irq_affinity)
|
|
return -EIO;
|
|
|
|
err = cpumask_parse(buffer, count, new_value);
|
|
if (err)
|
|
return err;
|
|
|
|
/*
|
|
* Do not allow disabling IRQs completely - it's a too easy
|
|
* way to make the system unusable accidentally :-) At least
|
|
* one online CPU still has to be targeted.
|
|
*/
|
|
cpus_and(tmp, new_value, cpu_online_map);
|
|
if (cpus_empty(tmp))
|
|
return -EINVAL;
|
|
|
|
proc_set_irq_affinity(irq, new_value);
|
|
|
|
return full_count;
|
|
}
|
|
|
|
#endif
|
|
|
|
#define MAX_NAMELEN 128
|
|
|
|
static int name_unique(unsigned int irq, struct irqaction *new_action)
|
|
{
|
|
struct irq_desc *desc = irq_desc + irq;
|
|
struct irqaction *action;
|
|
|
|
for (action = desc->action ; action; action = action->next)
|
|
if ((action != new_action) && action->name &&
|
|
!strcmp(new_action->name, action->name))
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
void register_handler_proc(unsigned int irq, struct irqaction *action)
|
|
{
|
|
char name [MAX_NAMELEN];
|
|
|
|
if (!irq_dir[irq] || action->dir || !action->name ||
|
|
!name_unique(irq, action))
|
|
return;
|
|
|
|
memset(name, 0, MAX_NAMELEN);
|
|
snprintf(name, MAX_NAMELEN, "%s", action->name);
|
|
|
|
/* create /proc/irq/1234/handler/ */
|
|
action->dir = proc_mkdir(name, irq_dir[irq]);
|
|
}
|
|
|
|
#undef MAX_NAMELEN
|
|
|
|
#define MAX_NAMELEN 10
|
|
|
|
void register_irq_proc(unsigned int irq)
|
|
{
|
|
char name [MAX_NAMELEN];
|
|
|
|
if (!root_irq_dir ||
|
|
(irq_desc[irq].handler == &no_irq_type) ||
|
|
irq_dir[irq])
|
|
return;
|
|
|
|
memset(name, 0, MAX_NAMELEN);
|
|
sprintf(name, "%d", irq);
|
|
|
|
/* create /proc/irq/1234 */
|
|
irq_dir[irq] = proc_mkdir(name, root_irq_dir);
|
|
|
|
#ifdef CONFIG_SMP
|
|
{
|
|
struct proc_dir_entry *entry;
|
|
|
|
/* create /proc/irq/<irq>/smp_affinity */
|
|
entry = create_proc_entry("smp_affinity", 0600, irq_dir[irq]);
|
|
|
|
if (entry) {
|
|
entry->nlink = 1;
|
|
entry->data = (void *)(long)irq;
|
|
entry->read_proc = irq_affinity_read_proc;
|
|
entry->write_proc = irq_affinity_write_proc;
|
|
}
|
|
smp_affinity_entry[irq] = entry;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
#undef MAX_NAMELEN
|
|
|
|
void unregister_handler_proc(unsigned int irq, struct irqaction *action)
|
|
{
|
|
if (action->dir)
|
|
remove_proc_entry(action->dir->name, irq_dir[irq]);
|
|
}
|
|
|
|
void init_irq_proc(void)
|
|
{
|
|
int i;
|
|
|
|
/* create /proc/irq */
|
|
root_irq_dir = proc_mkdir("irq", NULL);
|
|
if (!root_irq_dir)
|
|
return;
|
|
|
|
/*
|
|
* Create entries for all existing IRQs.
|
|
*/
|
|
for (i = 0; i < NR_IRQS; i++)
|
|
register_irq_proc(i);
|
|
}
|
|
|