static struct proc_dir_entry * root_irq_dir;
static struct proc_dir_entry * irq_dir [NR_IRQS];
#define HEX_DIGITS 8
static unsigned int parse_hex_value (const char *buffer,
unsigned long count, unsigned long *ret)
{
unsigned char hexnum [HEX_DIGITS];
unsigned long value;
int i;
if (!count)
return -EINVAL;
if (count > HEX_DIGITS)
count = HEX_DIGITS;
if (copy_from_user(hexnum, buffer, count))
return -EFAULT;
/*
* Parse the first 8 characters as a hex string, any non-hex char
* is end-of-string. '00e1', 'e1', '00E1', 'E1' are all the same.
*/
value = 0;
for (i = 0; i < count; i++) {
unsigned int c = hexnum[i];
switch (c) {
case '0' ... '9': c -= '0'; break;
case 'a' ... 'f': c -= 'a'-10; break;
case 'A' ... 'F': c -= 'A'-10; break;
default:
goto out;
}
value = (value << 4) | c;
}
out:
*ret = value;
return 0;
}
#if CONFIG_SMP
static struct proc_dir_entry * smp_affinity_entry [NR_IRQS];
static unsigned long irq_affinity [NR_IRQS] = { [0 ... NR_IRQS-1] = ~0UL };
static int irq_affinity_read_proc (char *page, char **start, off_t off,
int count, int *eof, void *data)
{
if (count < HEX_DIGITS+1)
return -EINVAL;
return sprintf (page, "%08lx\n", irq_affinity[(long)data]);
}
static int irq_affinity_write_proc (struct file *file, const char *buffer,
unsigned long count, void *data)
{
int irq = (long) data, full_count = count, err;
unsigned long new_value;
if (!irq_desc[irq].handler->set_affinity)
return -EIO;
err = parse_hex_value(buffer, count, &new_value);
/*
* 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.
*/
if (!(new_value & cpu_online_map))
return -EINVAL;
irq_affinity[irq] = new_value;
irq_desc[irq].handler->set_affinity(irq, new_value);
return full_count;
}
#endif
static int prof_cpu_mask_read_proc (char *page, char **start, off_t off,
int count, int *eof, void *data)
{
unsigned long *mask = (unsigned long *) data;
if (count < HEX_DIGITS+1)
return -EINVAL;
return sprintf (page, "%08lx\n", *mask);
}
static int prof_cpu_mask_write_proc (struct file *file, const char *buffer,
unsigned long count, void *data)
{
unsigned long *mask = (unsigned long *) data, full_count = count, err;
unsigned long new_value;
err = parse_hex_value(buffer, count, &new_value);
if (err)
return err;
*mask = new_value;
return full_count;
}
#define MAX_NAMELEN 10
static 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);
#if CONFIG_SMP
{
struct proc_dir_entry *entry;
/* create /proc/irq/1234/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
}
unsigned long prof_cpu_mask = -1;
void init_irq_proc (void)
{
struct proc_dir_entry *entry;
int i;
/* create /proc/irq */
root_irq_dir = proc_mkdir("irq", 0);
/* create /proc/irq/prof_cpu_mask */
entry = create_proc_entry("prof_cpu_mask", 0600, root_irq_dir);
if (!entry)
return;
entry->nlink = 1;
entry->data = (void *)&prof_cpu_mask;
entry->read_proc = prof_cpu_mask_read_proc;
entry->write_proc = prof_cpu_mask_write_proc;
/*
* Create entries for all existing IRQs.
*/
for (i = 0; i < NR_IRQS; i++)
register_irq_proc(i);
}