Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*

 * 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;

#ifdef CONFIG_SMP

static int irq_affinity_read_proc(char *page, char **start, off_t off,

                                  int count, int *eof, void *data)

{

        struct irq_desc *desc = irq_desc + (long)data;

        cpumask_t *mask = &desc->affinity;

        int len;

#ifdef CONFIG_GENERIC_PENDING_IRQ

        if (desc->status & IRQ_MOVE_PENDING)

                mask = &desc->pending_mask;

#endif

        len = cpumask_scnprintf(page, count, *mask);

        if (count - len < 2)

                return -EINVAL;

        len += sprintf(page + len, "\n");

        return len;

}

#ifndef is_affinity_mask_valid

#define is_affinity_mask_valid(val) 1

#endif

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 ||

            irq_balancing_disabled(irq))

                return -EIO;

        err = cpumask_parse_user(buffer, count, new_value);

        if (err)

                return err;

        if (!is_affinity_mask_valid(new_value))

                return -EINVAL;

        /*

         * 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;

        irq_set_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;

        unsigned long flags;

        int ret = 1;

        spin_lock_irqsave(&desc->lock, flags);

        for (action = desc->action ; action; action = action->next) {

                if ((action != new_action) && action->name &&

                                !strcmp(new_action->name, action->name)) {

                        ret = 0;

                        break;

                }

        }

        spin_unlock_irqrestore(&desc->lock, flags);

        return ret;

}

void register_handler_proc(unsigned int irq, struct irqaction *action)

{

        char name [MAX_NAMELEN];

        if (!irq_desc[irq].dir || 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_desc[irq].dir);

}

#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_chip) ||

                        irq_desc[irq].dir)

                return;

        memset(name, 0, MAX_NAMELEN);

        sprintf(name, "%d", irq);

        /* create /proc/irq/1234 */

        irq_desc[irq].dir = 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_desc[irq].dir);

                if (entry) {

                        entry->data = (void *)(long)irq;

                        entry->read_proc = irq_affinity_read_proc;

                        entry->write_proc = irq_affinity_write_proc;

                }

        }

#endif

}

#undef MAX_NAMELEN

void unregister_handler_proc(unsigned int irq, struct irqaction *action)

{

        if (action->dir)

                remove_proc_entry(action->dir->name, irq_desc[irq].dir);

}

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);

}