| /* |
| * 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> |
| |
| #include "internals.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]; |
| |
| #ifdef CONFIG_GENERIC_PENDING_IRQ |
| void proc_set_irq_affinity(unsigned int irq, cpumask_t mask_val) |
| { |
| set_balance_irq_affinity(irq, mask_val); |
| |
| /* |
| * Save these away for later use. Re-progam when the |
| * interrupt is pending |
| */ |
| set_pending_irq(irq, mask_val); |
| } |
| #else |
| void proc_set_irq_affinity(unsigned int irq, cpumask_t mask_val) |
| { |
| set_balance_irq_affinity(irq, mask_val); |
| irq_affinity[irq] = mask_val; |
| irq_desc[irq].chip->set_affinity(irq, mask_val); |
| } |
| #endif |
| |
| 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].chip->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)) |
| /* Special case for empty set - allow the architecture |
| code to set default SMP affinity. */ |
| return select_smp_affinity(irq) ? -EINVAL : full_count; |
| |
| 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].chip == &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); |
| } |
| |