[linux.git] / kernel / irq / proc.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/gfp.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/interrupt.h>
#include <linux/kernel_stat.h>

#include "internals.h"

static struct proc_dir_entry *root_irq_dir;

#ifdef CONFIG_SMP

static int show_irq_affinity(int type, struct seq_file *m, void *v)
{
	struct irq_desc *desc = irq_to_desc((long)m->private);
	const struct cpumask *mask = desc->irq_data.affinity;

#ifdef CONFIG_GENERIC_PENDING_IRQ
	if (irqd_is_setaffinity_pending(&desc->irq_data))
		mask = desc->pending_mask;
#endif
	if (type)
		seq_cpumask_list(m, mask);
	else
		seq_cpumask(m, mask);
	seq_putc(m, '\n');
	return 0;
}

static int irq_affinity_hint_proc_show(struct seq_file *m, void *v)
{
	struct irq_desc *desc = irq_to_desc((long)m->private);
	unsigned long flags;
	cpumask_var_t mask;

	if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
		return -ENOMEM;

	raw_spin_lock_irqsave(&desc->lock, flags);
	if (desc->affinity_hint)
		cpumask_copy(mask, desc->affinity_hint);
	raw_spin_unlock_irqrestore(&desc->lock, flags);

	seq_cpumask(m, mask);
	seq_putc(m, '\n');
	free_cpumask_var(mask);

	return 0;
}

#ifndef is_affinity_mask_valid
#define is_affinity_mask_valid(val) 1
#endif

int no_irq_affinity;
static int irq_affinity_proc_show(struct seq_file *m, void *v)
{
	return show_irq_affinity(0, m, v);
}

static int irq_affinity_list_proc_show(struct seq_file *m, void *v)
{
	return show_irq_affinity(1, m, v);
}


static ssize_t write_irq_affinity(int type, struct file *file,
		const char __user *buffer, size_t count, loff_t *pos)
{
	unsigned int irq = (int)(long)PDE_DATA(file_inode(file));
	cpumask_var_t new_value;
	int err;

	if (!irq_can_set_affinity(irq) || no_irq_affinity)
		return -EIO;

	if (!alloc_cpumask_var(&new_value, GFP_KERNEL))
		return -ENOMEM;

	if (type)
		err = cpumask_parselist_user(buffer, count, new_value);
	else
		err = cpumask_parse_user(buffer, count, new_value);
	if (err)
		goto free_cpumask;

	if (!is_affinity_mask_valid(new_value)) {
		err = -EINVAL;
		goto free_cpumask;
	}

	/*
	 * 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 (!cpumask_intersects(new_value, cpu_online_mask)) {
		/* Special case for empty set - allow the architecture
		   code to set default SMP affinity. */
		err = irq_select_affinity_usr(irq, new_value) ? -EINVAL : count;
	} else {
		irq_set_affinity(irq, new_value);
		err = count;
	}

free_cpumask:
	free_cpumask_var(new_value);
	return err;
}

static ssize_t irq_affinity_proc_write(struct file *file,
		const char __user *buffer, size_t count, loff_t *pos)
{
	return write_irq_affinity(0, file, buffer, count, pos);
}

static ssize_t irq_affinity_list_proc_write(struct file *file,
		const char __user *buffer, size_t count, loff_t *pos)
{
	return write_irq_affinity(1, file, buffer, count, pos);
}

static int irq_affinity_proc_open(struct inode *inode, struct file *file)
{
	return single_open(file, irq_affinity_proc_show, PDE_DATA(inode));
}

static int irq_affinity_list_proc_open(struct inode *inode, struct file *file)
{
	return single_open(file, irq_affinity_list_proc_show, PDE_DATA(inode));
}

static int irq_affinity_hint_proc_open(struct inode *inode, struct file *file)
{
	return single_open(file, irq_affinity_hint_proc_show, PDE_DATA(inode));
}

static const struct file_operations irq_affinity_proc_fops = {
	.open		= irq_affinity_proc_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
	.write		= irq_affinity_proc_write,
};

static const struct file_operations irq_affinity_hint_proc_fops = {
	.open		= irq_affinity_hint_proc_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

static const struct file_operations irq_affinity_list_proc_fops = {
	.open		= irq_affinity_list_proc_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
	.write		= irq_affinity_list_proc_write,
};

static int default_affinity_show(struct seq_file *m, void *v)
{
	seq_cpumask(m, irq_default_affinity);
	seq_putc(m, '\n');
	return 0;
}

static ssize_t default_affinity_write(struct file *file,
		const char __user *buffer, size_t count, loff_t *ppos)
{
	cpumask_var_t new_value;
	int err;

	if (!alloc_cpumask_var(&new_value, GFP_KERNEL))
		return -ENOMEM;

	err = cpumask_parse_user(buffer, count, new_value);
	if (err)
		goto out;

	if (!is_affinity_mask_valid(new_value)) {
		err = -EINVAL;
		goto out;
	}

	/*
	 * 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 (!cpumask_intersects(new_value, cpu_online_mask)) {
		err = -EINVAL;
		goto out;
	}

	cpumask_copy(irq_default_affinity, new_value);
	err = count;

out:
	free_cpumask_var(new_value);
	return err;
}

static int default_affinity_open(struct inode *inode, struct file *file)
{
	return single_open(file, default_affinity_show, PDE_DATA(inode));
}

static const struct file_operations default_affinity_proc_fops = {
	.open		= default_affinity_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
	.write		= default_affinity_write,
};

static int irq_node_proc_show(struct seq_file *m, void *v)
{
	struct irq_desc *desc = irq_to_desc((long) m->private);

	seq_printf(m, "%d\n", desc->irq_data.node);
	return 0;
}

static int irq_node_proc_open(struct inode *inode, struct file *file)
{
	return single_open(file, irq_node_proc_show, PDE_DATA(inode));
}

static const struct file_operations irq_node_proc_fops = {
	.open		= irq_node_proc_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};
#endif

static int irq_spurious_proc_show(struct seq_file *m, void *v)
{
	struct irq_desc *desc = irq_to_desc((long) m->private);

	seq_printf(m, "count %u\n" "unhandled %u\n" "last_unhandled %u ms\n",
		   desc->irq_count, desc->irqs_unhandled,
		   jiffies_to_msecs(desc->last_unhandled));
	return 0;
}

static int irq_spurious_proc_open(struct inode *inode, struct file *file)
{
	return single_open(file, irq_spurious_proc_show, PDE_DATA(inode));
}

static const struct file_operations irq_spurious_proc_fops = {
	.open		= irq_spurious_proc_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

#define MAX_NAMELEN 128

static int name_unique(unsigned int irq, struct irqaction *new_action)
{
	struct irq_desc *desc = irq_to_desc(irq);
	struct irqaction *action;
	unsigned long flags;
	int ret = 1;

	raw_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;
		}
	}
	raw_spin_unlock_irqrestore(&desc->lock, flags);
	return ret;
}

void register_handler_proc(unsigned int irq, struct irqaction *action)
{
	char name [MAX_NAMELEN];
	struct irq_desc *desc = irq_to_desc(irq);

	if (!desc->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, desc->dir);
}

#undef MAX_NAMELEN

#define MAX_NAMELEN 10

void register_irq_proc(unsigned int irq, struct irq_desc *desc)
{
	char name [MAX_NAMELEN];

	if (!root_irq_dir || (desc->irq_data.chip == &no_irq_chip) || desc->dir)
		return;

	memset(name, 0, MAX_NAMELEN);
	sprintf(name, "%d", irq);

	/* create /proc/irq/1234 */
	desc->dir = proc_mkdir(name, root_irq_dir);
	if (!desc->dir)
		return;

#ifdef CONFIG_SMP
	/* create /proc/irq/<irq>/smp_affinity */
	proc_create_data("smp_affinity", 0644, desc->dir,
			 &irq_affinity_proc_fops, (void *)(long)irq);

	/* create /proc/irq/<irq>/affinity_hint */
	proc_create_data("affinity_hint", 0444, desc->dir,
			 &irq_affinity_hint_proc_fops, (void *)(long)irq);

	/* create /proc/irq/<irq>/smp_affinity_list */
	proc_create_data("smp_affinity_list", 0644, desc->dir,
			 &irq_affinity_list_proc_fops, (void *)(long)irq);

	proc_create_data("node", 0444, desc->dir,
			 &irq_node_proc_fops, (void *)(long)irq);
#endif

	proc_create_data("spurious", 0444, desc->dir,
			 &irq_spurious_proc_fops, (void *)(long)irq);
}

void unregister_irq_proc(unsigned int irq, struct irq_desc *desc)
{
	char name [MAX_NAMELEN];

	if (!root_irq_dir || !desc->dir)
		return;
#ifdef CONFIG_SMP
	remove_proc_entry("smp_affinity", desc->dir);
	remove_proc_entry("affinity_hint", desc->dir);
	remove_proc_entry("smp_affinity_list", desc->dir);
	remove_proc_entry("node", desc->dir);
#endif
	remove_proc_entry("spurious", desc->dir);

	memset(name, 0, MAX_NAMELEN);
	sprintf(name, "%u", irq);
	remove_proc_entry(name, root_irq_dir);
}

#undef MAX_NAMELEN

void unregister_handler_proc(unsigned int irq, struct irqaction *action)
{
	proc_remove(action->dir);
}

static void register_default_affinity_proc(void)
{
#ifdef CONFIG_SMP
	proc_create("irq/default_smp_affinity", 0644, NULL,
		    &default_affinity_proc_fops);
#endif
}

void init_irq_proc(void)
{
	unsigned int irq;
	struct irq_desc *desc;

	/* create /proc/irq */
	root_irq_dir = proc_mkdir("irq", NULL);
	if (!root_irq_dir)
		return;

	register_default_affinity_proc();

	/*
	 * Create entries for all existing IRQs.
	 */
	for_each_irq_desc(irq, desc) {
		if (!desc)
			continue;

		register_irq_proc(irq, desc);
	}
}

#ifdef CONFIG_GENERIC_IRQ_SHOW

int __weak arch_show_interrupts(struct seq_file *p, int prec)
{
	return 0;
}

#ifndef ACTUAL_NR_IRQS
# define ACTUAL_NR_IRQS nr_irqs
#endif

int show_interrupts(struct seq_file *p, void *v)
{
	static int prec;

	unsigned long flags, any_count = 0;
	int i = *(loff_t *) v, j;
	struct irqaction *action;
	struct irq_desc *desc;

	if (i > ACTUAL_NR_IRQS)
		return 0;

	if (i == ACTUAL_NR_IRQS)
		return arch_show_interrupts(p, prec);

	/* print header and calculate the width of the first column */
	if (i == 0) {
		for (prec = 3, j = 1000; prec < 10 && j <= nr_irqs; ++prec)
			j *= 10;

		seq_printf(p, "%*s", prec + 8, "");
		for_each_online_cpu(j)
			seq_printf(p, "CPU%-8d", j);
		seq_putc(p, '\n');
	}

	desc = irq_to_desc(i);
	if (!desc)
		return 0;

	raw_spin_lock_irqsave(&desc->lock, flags);
	for_each_online_cpu(j)
		any_count |= kstat_irqs_cpu(i, j);
	action = desc->action;
	if (!action && !any_count)
		goto out;

	seq_printf(p, "%*d: ", prec, i);
	for_each_online_cpu(j)
		seq_printf(p, "%10u ", kstat_irqs_cpu(i, j));

	if (desc->irq_data.chip) {
		if (desc->irq_data.chip->irq_print_chip)
			desc->irq_data.chip->irq_print_chip(&desc->irq_data, p);
		else if (desc->irq_data.chip->name)
			seq_printf(p, " %8s", desc->irq_data.chip->name);
		else
			seq_printf(p, " %8s", "-");
	} else {
		seq_printf(p, " %8s", "None");
	}
	if (desc->irq_data.domain)
		seq_printf(p, " %*d", prec, (int) desc->irq_data.hwirq);
#ifdef CONFIG_GENERIC_IRQ_SHOW_LEVEL
	seq_printf(p, " %-8s", irqd_is_level_type(&desc->irq_data) ? "Level" : "Edge");
#endif
	if (desc->name)
		seq_printf(p, "-%-8s", desc->name);

	if (action) {
		seq_printf(p, "  %s", action->name);
		while ((action = action->next) != NULL)
			seq_printf(p, ", %s", action->name);
	}

	seq_putc(p, '\n');
out:
	raw_spin_unlock_irqrestore(&desc->lock, flags);
	return 0;
}
#endif
Commit	Line	Data
1da177e4 LT	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>
5a0e3ad6	10	#include <linux/gfp.h>
1da177e4	11	#include <linux/proc_fs.h>
f18e439d	12	#include <linux/seq_file.h>
1da177e4	13	#include <linux/interrupt.h>
c78b9b65	14	#include <linux/kernel_stat.h>
1da177e4	15
97a41e26 AB	16	#include "internals.h"
97a41e26 AB	17
4a733ee1	18	static struct proc_dir_entry *root_irq_dir;
1da177e4 LT	19
	20	#ifdef CONFIG_SMP
	21
4b060420	22	static int show_irq_affinity(int type, struct seq_file m, void v)
1da177e4	23	{
08678b08	24	struct irq_desc *desc = irq_to_desc((long)m->private);
6b8ff312	25	const struct cpumask *mask = desc->irq_data.affinity;
42ee2b74 AK	26
42ee2b74 AK	27	#ifdef CONFIG_GENERIC_PENDING_IRQ
f230b6d5	28	if (irqd_is_setaffinity_pending(&desc->irq_data))
7f7ace0c	29	mask = desc->pending_mask;
42ee2b74	30	#endif
4b060420 MT	31	if (type)
	32	seq_cpumask_list(m, mask);
	33	else
	34	seq_cpumask(m, mask);
f18e439d AD	35	seq_putc(m, '\n');
f18e439d AD	36	return 0;
1da177e4 LT	37	}
1da177e4 LT	38
e7a297b0 PWJ	39	static int irq_affinity_hint_proc_show(struct seq_file m, void v)
	40	{
	41	struct irq_desc *desc = irq_to_desc((long)m->private);
	42	unsigned long flags;
	43	cpumask_var_t mask;
	44
4308ad80	45	if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
e7a297b0 PWJ	46	return -ENOMEM;
	47
	48	raw_spin_lock_irqsave(&desc->lock, flags);
	49	if (desc->affinity_hint)
	50	cpumask_copy(mask, desc->affinity_hint);
e7a297b0 PWJ	51	raw_spin_unlock_irqrestore(&desc->lock, flags);
	52
	53	seq_cpumask(m, mask);
	54	seq_putc(m, '\n');
	55	free_cpumask_var(mask);
	56
	57	return 0;
	58	}
	59
25d61578 JK	60	#ifndef is_affinity_mask_valid
	61	#define is_affinity_mask_valid(val) 1
	62	#endif
	63
1da177e4	64	int no_irq_affinity;
4b060420 MT	65	static int irq_affinity_proc_show(struct seq_file m, void v)
	66	{
	67	return show_irq_affinity(0, m, v);
	68	}
	69
	70	static int irq_affinity_list_proc_show(struct seq_file m, void v)
	71	{
	72	return show_irq_affinity(1, m, v);
	73	}
	74
	75
	76	static ssize_t write_irq_affinity(int type, struct file *file,
f18e439d	77	const char __user buffer, size_t count, loff_t pos)
1da177e4	78	{
d9dda78b	79	unsigned int irq = (int)(long)PDE_DATA(file_inode(file));
0de26520	80	cpumask_var_t new_value;
f18e439d	81	int err;
1da177e4	82
bce43032	83	if (!irq_can_set_affinity(irq) \|\| no_irq_affinity)
1da177e4 LT	84	return -EIO;
1da177e4 LT	85
0de26520 RR	86	if (!alloc_cpumask_var(&new_value, GFP_KERNEL))
	87	return -ENOMEM;
	88
4b060420 MT	89	if (type)
	90	err = cpumask_parselist_user(buffer, count, new_value);
	91	else
	92	err = cpumask_parse_user(buffer, count, new_value);
1da177e4	93	if (err)
0de26520	94	goto free_cpumask;
1da177e4	95
6bdf197b	96	if (!is_affinity_mask_valid(new_value)) {
0de26520 RR	97	err = -EINVAL;
	98	goto free_cpumask;
	99	}
25d61578	100
1da177e4 LT	101	/*
	102	* Do not allow disabling IRQs completely - it's a too easy
	103	* way to make the system unusable accidentally :-) At least
	104	* one online CPU still has to be targeted.
	105	*/
0de26520	106	if (!cpumask_intersects(new_value, cpu_online_mask)) {
eee45269 IK	107	/* Special case for empty set - allow the architecture
eee45269 IK	108	code to set default SMP affinity. */
3b8249e7	109	err = irq_select_affinity_usr(irq, new_value) ? -EINVAL : count;
0de26520 RR	110	} else {
	111	irq_set_affinity(irq, new_value);
	112	err = count;
	113	}
	114
	115	free_cpumask:
	116	free_cpumask_var(new_value);
	117	return err;
1da177e4 LT	118	}
1da177e4 LT	119
4b060420 MT	120	static ssize_t irq_affinity_proc_write(struct file *file,
	121	const char __user buffer, size_t count, loff_t pos)
	122	{
	123	return write_irq_affinity(0, file, buffer, count, pos);
	124	}
	125
	126	static ssize_t irq_affinity_list_proc_write(struct file *file,
	127	const char __user buffer, size_t count, loff_t pos)
	128	{
	129	return write_irq_affinity(1, file, buffer, count, pos);
	130	}
	131
f18e439d	132	static int irq_affinity_proc_open(struct inode inode, struct file file)
18404756	133	{
d9dda78b	134	return single_open(file, irq_affinity_proc_show, PDE_DATA(inode));
18404756 MK	135	}
18404756 MK	136
4b060420 MT	137	static int irq_affinity_list_proc_open(struct inode inode, struct file file)
4b060420 MT	138	{
d9dda78b	139	return single_open(file, irq_affinity_list_proc_show, PDE_DATA(inode));
4b060420 MT	140	}
4b060420 MT	141
e7a297b0 PWJ	142	static int irq_affinity_hint_proc_open(struct inode inode, struct file file)
e7a297b0 PWJ	143	{
d9dda78b	144	return single_open(file, irq_affinity_hint_proc_show, PDE_DATA(inode));
e7a297b0 PWJ	145	}
e7a297b0 PWJ	146
f18e439d AD	147	static const struct file_operations irq_affinity_proc_fops = {
	148	.open = irq_affinity_proc_open,
	149	.read = seq_read,
	150	.llseek = seq_lseek,
	151	.release = single_release,
	152	.write = irq_affinity_proc_write,
	153	};
	154
e7a297b0 PWJ	155	static const struct file_operations irq_affinity_hint_proc_fops = {
	156	.open = irq_affinity_hint_proc_open,
	157	.read = seq_read,
	158	.llseek = seq_lseek,
	159	.release = single_release,
	160	};
	161
4b060420 MT	162	static const struct file_operations irq_affinity_list_proc_fops = {
	163	.open = irq_affinity_list_proc_open,
	164	.read = seq_read,
	165	.llseek = seq_lseek,
	166	.release = single_release,
	167	.write = irq_affinity_list_proc_write,
	168	};
	169
f18e439d AD	170	static int default_affinity_show(struct seq_file m, void v)
f18e439d AD	171	{
d036e67b	172	seq_cpumask(m, irq_default_affinity);
f18e439d AD	173	seq_putc(m, '\n');
	174	return 0;
	175	}
	176
	177	static ssize_t default_affinity_write(struct file *file,
	178	const char __user buffer, size_t count, loff_t ppos)
18404756	179	{
d036e67b	180	cpumask_var_t new_value;
f18e439d	181	int err;
18404756	182
d036e67b RR	183	if (!alloc_cpumask_var(&new_value, GFP_KERNEL))
	184	return -ENOMEM;
	185
	186	err = cpumask_parse_user(buffer, count, new_value);
18404756	187	if (err)
d036e67b	188	goto out;
18404756	189
d036e67b RR	190	if (!is_affinity_mask_valid(new_value)) {
	191	err = -EINVAL;
	192	goto out;
	193	}
18404756 MK	194
	195	/*
	196	* Do not allow disabling IRQs completely - it's a too easy
	197	* way to make the system unusable accidentally :-) At least
	198	* one online CPU still has to be targeted.
	199	*/
d036e67b RR	200	if (!cpumask_intersects(new_value, cpu_online_mask)) {
	201	err = -EINVAL;
	202	goto out;
	203	}
18404756	204
d036e67b RR	205	cpumask_copy(irq_default_affinity, new_value);
d036e67b RR	206	err = count;
18404756	207
d036e67b RR	208	out:
	209	free_cpumask_var(new_value);
	210	return err;
18404756	211	}
f18e439d AD	212
	213	static int default_affinity_open(struct inode inode, struct file file)
	214	{
d9dda78b	215	return single_open(file, default_affinity_show, PDE_DATA(inode));
f18e439d AD	216	}
	217
	218	static const struct file_operations default_affinity_proc_fops = {
	219	.open = default_affinity_open,
	220	.read = seq_read,
	221	.llseek = seq_lseek,
	222	.release = single_release,
	223	.write = default_affinity_write,
	224	};
92d6b71a DS	225
	226	static int irq_node_proc_show(struct seq_file m, void v)
	227	{
	228	struct irq_desc *desc = irq_to_desc((long) m->private);
	229
6b8ff312	230	seq_printf(m, "%d\n", desc->irq_data.node);
92d6b71a DS	231	return 0;
	232	}
	233
	234	static int irq_node_proc_open(struct inode inode, struct file file)
	235	{
d9dda78b	236	return single_open(file, irq_node_proc_show, PDE_DATA(inode));
92d6b71a DS	237	}
	238
	239	static const struct file_operations irq_node_proc_fops = {
	240	.open = irq_node_proc_open,
	241	.read = seq_read,
	242	.llseek = seq_lseek,
	243	.release = single_release,
	244	};
1da177e4 LT	245	#endif
1da177e4 LT	246
a1afb637	247	static int irq_spurious_proc_show(struct seq_file m, void v)
96d97cf0	248	{
a1afb637 AD	249	struct irq_desc *desc = irq_to_desc((long) m->private);
	250
	251	seq_printf(m, "count %u\n" "unhandled %u\n" "last_unhandled %u ms\n",
	252	desc->irq_count, desc->irqs_unhandled,
	253	jiffies_to_msecs(desc->last_unhandled));
	254	return 0;
	255	}
	256
	257	static int irq_spurious_proc_open(struct inode inode, struct file file)
	258	{
d9dda78b	259	return single_open(file, irq_spurious_proc_show, PDE_DATA(inode));
96d97cf0 AK	260	}
96d97cf0 AK	261
a1afb637 AD	262	static const struct file_operations irq_spurious_proc_fops = {
	263	.open = irq_spurious_proc_open,
	264	.read = seq_read,
	265	.llseek = seq_lseek,
	266	.release = single_release,
	267	};
	268
1da177e4 LT	269	#define MAX_NAMELEN 128
	270
	271	static int name_unique(unsigned int irq, struct irqaction *new_action)
	272	{
08678b08	273	struct irq_desc *desc = irq_to_desc(irq);
1da177e4	274	struct irqaction *action;
d2d9433a DA	275	unsigned long flags;
d2d9433a DA	276	int ret = 1;
1da177e4	277
239007b8	278	raw_spin_lock_irqsave(&desc->lock, flags);
d2d9433a	279	for (action = desc->action ; action; action = action->next) {
1da177e4	280	if ((action != new_action) && action->name &&
d2d9433a DA	281	!strcmp(new_action->name, action->name)) {
	282	ret = 0;
	283	break;
	284	}
	285	}
239007b8	286	raw_spin_unlock_irqrestore(&desc->lock, flags);
d2d9433a	287	return ret;
1da177e4 LT	288	}
	289
	290	void register_handler_proc(unsigned int irq, struct irqaction *action)
	291	{
	292	char name [MAX_NAMELEN];
08678b08	293	struct irq_desc *desc = irq_to_desc(irq);
1da177e4	294
08678b08	295	if (!desc->dir \|\| action->dir \|\| !action->name \|\|
1da177e4 LT	296	!name_unique(irq, action))
	297	return;
	298
	299	memset(name, 0, MAX_NAMELEN);
	300	snprintf(name, MAX_NAMELEN, "%s", action->name);
	301
	302	/* create /proc/irq/1234/handler/ */
08678b08	303	action->dir = proc_mkdir(name, desc->dir);
1da177e4 LT	304	}
	305
	306	#undef MAX_NAMELEN
	307
	308	#define MAX_NAMELEN 10
	309
2c6927a3	310	void register_irq_proc(unsigned int irq, struct irq_desc *desc)
1da177e4 LT	311	{
	312	char name [MAX_NAMELEN];
	313
6b8ff312	314	if (!root_irq_dir \|\| (desc->irq_data.chip == &no_irq_chip) \|\| desc->dir)
1da177e4 LT	315	return;
	316
	317	memset(name, 0, MAX_NAMELEN);
	318	sprintf(name, "%d", irq);
	319
	320	/* create /proc/irq/1234 */
08678b08	321	desc->dir = proc_mkdir(name, root_irq_dir);
c82a43d4 CG	322	if (!desc->dir)
c82a43d4 CG	323	return;
1da177e4 LT	324
1da177e4 LT	325	#ifdef CONFIG_SMP
f18e439d	326	/* create /proc/irq/<irq>/smp_affinity */
bab5c790	327	proc_create_data("smp_affinity", 0644, desc->dir,
f18e439d	328	&irq_affinity_proc_fops, (void *)(long)irq);
92d6b71a	329
e7a297b0	330	/* create /proc/irq/<irq>/affinity_hint */
bab5c790	331	proc_create_data("affinity_hint", 0444, desc->dir,
e7a297b0 PWJ	332	&irq_affinity_hint_proc_fops, (void *)(long)irq);
e7a297b0 PWJ	333
4b060420	334	/* create /proc/irq/<irq>/smp_affinity_list */
bab5c790	335	proc_create_data("smp_affinity_list", 0644, desc->dir,
4b060420 MT	336	&irq_affinity_list_proc_fops, (void *)(long)irq);
4b060420 MT	337
92d6b71a DS	338	proc_create_data("node", 0444, desc->dir,
92d6b71a DS	339	&irq_node_proc_fops, (void *)(long)irq);
1da177e4	340	#endif
96d97cf0	341
a1afb637 AD	342	proc_create_data("spurious", 0444, desc->dir,
a1afb637 AD	343	&irq_spurious_proc_fops, (void *)(long)irq);
1da177e4 LT	344	}
1da177e4 LT	345
13bfe99e TG	346	void unregister_irq_proc(unsigned int irq, struct irq_desc *desc)
	347	{
	348	char name [MAX_NAMELEN];
	349
	350	if (!root_irq_dir \|\| !desc->dir)
	351	return;
	352	#ifdef CONFIG_SMP
	353	remove_proc_entry("smp_affinity", desc->dir);
	354	remove_proc_entry("affinity_hint", desc->dir);
def945ee	355	remove_proc_entry("smp_affinity_list", desc->dir);
13bfe99e TG	356	remove_proc_entry("node", desc->dir);
	357	#endif
	358	remove_proc_entry("spurious", desc->dir);
	359
	360	memset(name, 0, MAX_NAMELEN);
	361	sprintf(name, "%u", irq);
	362	remove_proc_entry(name, root_irq_dir);
	363	}
	364
1da177e4 LT	365	#undef MAX_NAMELEN
	366
	367	void unregister_handler_proc(unsigned int irq, struct irqaction *action)
	368	{
a8ca16ea	369	proc_remove(action->dir);
1da177e4 LT	370	}
1da177e4 LT	371
3786fc71	372	static void register_default_affinity_proc(void)
18404756 MK	373	{
18404756 MK	374	#ifdef CONFIG_SMP
bab5c790	375	proc_create("irq/default_smp_affinity", 0644, NULL,
f18e439d	376	&default_affinity_proc_fops);
18404756 MK	377	#endif
	378	}
	379
1da177e4 LT	380	void init_irq_proc(void)
1da177e4 LT	381	{
2c6927a3 YL	382	unsigned int irq;
2c6927a3 YL	383	struct irq_desc *desc;
1da177e4 LT	384
	385	/* create /proc/irq */
	386	root_irq_dir = proc_mkdir("irq", NULL);
	387	if (!root_irq_dir)
	388	return;
	389
18404756 MK	390	register_default_affinity_proc();
18404756 MK	391
1da177e4 LT	392	/*
	393	* Create entries for all existing IRQs.
	394	*/
0b8f1efa YL	395	for_each_irq_desc(irq, desc) {
	396	if (!desc)
	397	continue;
	398
2c6927a3	399	register_irq_proc(irq, desc);
0b8f1efa	400	}
1da177e4 LT	401	}
1da177e4 LT	402
c78b9b65 TG	403	#ifdef CONFIG_GENERIC_IRQ_SHOW
	404
	405	int __weak arch_show_interrupts(struct seq_file *p, int prec)
	406	{
	407	return 0;
	408	}
	409
a6e120ed TG	410	#ifndef ACTUAL_NR_IRQS
	411	# define ACTUAL_NR_IRQS nr_irqs
	412	#endif
	413
c78b9b65 TG	414	int show_interrupts(struct seq_file p, void v)
	415	{
	416	static int prec;
	417
	418	unsigned long flags, any_count = 0;
	419	int i = (loff_t ) v, j;
	420	struct irqaction *action;
	421	struct irq_desc *desc;
	422
a6e120ed	423	if (i > ACTUAL_NR_IRQS)
c78b9b65 TG	424	return 0;
c78b9b65 TG	425
a6e120ed	426	if (i == ACTUAL_NR_IRQS)
c78b9b65 TG	427	return arch_show_interrupts(p, prec);
	428
	429	/* print header and calculate the width of the first column */
	430	if (i == 0) {
	431	for (prec = 3, j = 1000; prec < 10 && j <= nr_irqs; ++prec)
	432	j *= 10;
	433
	434	seq_printf(p, "%*s", prec + 8, "");
	435	for_each_online_cpu(j)
	436	seq_printf(p, "CPU%-8d", j);
	437	seq_putc(p, '\n');
	438	}
	439
	440	desc = irq_to_desc(i);
	441	if (!desc)
	442	return 0;
	443
	444	raw_spin_lock_irqsave(&desc->lock, flags);
	445	for_each_online_cpu(j)
	446	any_count \|= kstat_irqs_cpu(i, j);
	447	action = desc->action;
	448	if (!action && !any_count)
	449	goto out;
	450
	451	seq_printf(p, "%*d: ", prec, i);
	452	for_each_online_cpu(j)
	453	seq_printf(p, "%10u ", kstat_irqs_cpu(i, j));
ab7798ff TG	454
	455	if (desc->irq_data.chip) {
	456	if (desc->irq_data.chip->irq_print_chip)
	457	desc->irq_data.chip->irq_print_chip(&desc->irq_data, p);
	458	else if (desc->irq_data.chip->name)
	459	seq_printf(p, " %8s", desc->irq_data.chip->name);
	460	else
	461	seq_printf(p, " %8s", "-");
	462	} else {
	463	seq_printf(p, " %8s", "None");
	464	}
c12d2f42 GL	465	if (desc->irq_data.domain)
c12d2f42 GL	466	seq_printf(p, " %*d", prec, (int) desc->irq_data.hwirq);
94b2c363	467	#ifdef CONFIG_GENERIC_IRQ_SHOW_LEVEL
ab7798ff TG	468	seq_printf(p, " %-8s", irqd_is_level_type(&desc->irq_data) ? "Level" : "Edge");
ab7798ff TG	469	#endif
ee0401ec TG	470	if (desc->name)
ee0401ec TG	471	seq_printf(p, "-%-8s", desc->name);
c78b9b65 TG	472
	473	if (action) {
	474	seq_printf(p, " %s", action->name);
	475	while ((action = action->next) != NULL)
	476	seq_printf(p, ", %s", action->name);
	477	}
	478
	479	seq_putc(p, '\n');
	480	out:
	481	raw_spin_unlock_irqrestore(&desc->lock, flags);
	482	return 0;
	483	}
	484	#endif