[deliverable/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"

/*
 * Access rules:
 *
 * procfs protects read/write of /proc/irq/N/ files against a
 * concurrent free of the interrupt descriptor. remove_proc_entry()
 * immediately prevents new read/writes to happen and waits for
 * already running read/write functions to complete.
 *
 * We remove the proc entries first and then delete the interrupt
 * descriptor from the radix tree and free it. So it is guaranteed
 * that irq_to_desc(N) is valid as long as the read/writes are
 * permitted by procfs.
 *
 * The read from /proc/interrupts is a different problem because there
 * is no protection. So the lookup and the access to irqdesc
 * information must be protected by sparse_irq_lock.
 */
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_common_data.affinity;

#ifdef CONFIG_GENERIC_PENDING_IRQ
	if (irqd_is_setaffinity_pending(&desc->irq_data))
		mask = desc->pending_mask;
#endif
	if (type)
		seq_printf(m, "%*pbl\n", cpumask_pr_args(mask));
	else
		seq_printf(m, "%*pb\n", cpumask_pr_args(mask));
	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_printf(m, "%*pb\n", cpumask_pr_args(mask));
	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_printf(m, "%*pb\n", cpumask_pr_args(irq_default_affinity));
	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", irq_desc_get_node(desc));
	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');
	}

	irq_lock_sparse();
	desc = irq_to_desc(i);
	if (!desc)
		goto outsparse;

	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);
outsparse:
	irq_unlock_sparse();
	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
c291ee62 TG	18	/*
	19	* Access rules:
	20	*
	21	* procfs protects read/write of /proc/irq/N/ files against a
	22	* concurrent free of the interrupt descriptor. remove_proc_entry()
	23	* immediately prevents new read/writes to happen and waits for
	24	* already running read/write functions to complete.
	25	*
	26	* We remove the proc entries first and then delete the interrupt
	27	* descriptor from the radix tree and free it. So it is guaranteed
	28	* that irq_to_desc(N) is valid as long as the read/writes are
	29	* permitted by procfs.
	30	*
	31	* The read from /proc/interrupts is a different problem because there
	32	* is no protection. So the lookup and the access to irqdesc
	33	* information must be protected by sparse_irq_lock.
	34	*/
4a733ee1	35	static struct proc_dir_entry *root_irq_dir;
1da177e4 LT	36
	37	#ifdef CONFIG_SMP
	38
4b060420	39	static int show_irq_affinity(int type, struct seq_file m, void v)
1da177e4	40	{
08678b08	41	struct irq_desc *desc = irq_to_desc((long)m->private);
9df872fa	42	const struct cpumask *mask = desc->irq_common_data.affinity;
42ee2b74 AK	43
42ee2b74 AK	44	#ifdef CONFIG_GENERIC_PENDING_IRQ
f230b6d5	45	if (irqd_is_setaffinity_pending(&desc->irq_data))
7f7ace0c	46	mask = desc->pending_mask;
42ee2b74	47	#endif
4b060420	48	if (type)
c1d7f03f	49	seq_printf(m, "%*pbl\n", cpumask_pr_args(mask));
4b060420	50	else
c1d7f03f	51	seq_printf(m, "%*pb\n", cpumask_pr_args(mask));
f18e439d	52	return 0;
1da177e4 LT	53	}
1da177e4 LT	54
e7a297b0 PWJ	55	static int irq_affinity_hint_proc_show(struct seq_file m, void v)
	56	{
	57	struct irq_desc *desc = irq_to_desc((long)m->private);
	58	unsigned long flags;
	59	cpumask_var_t mask;
	60
4308ad80	61	if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
e7a297b0 PWJ	62	return -ENOMEM;
	63
	64	raw_spin_lock_irqsave(&desc->lock, flags);
	65	if (desc->affinity_hint)
	66	cpumask_copy(mask, desc->affinity_hint);
e7a297b0 PWJ	67	raw_spin_unlock_irqrestore(&desc->lock, flags);
e7a297b0 PWJ	68
c1d7f03f	69	seq_printf(m, "%*pb\n", cpumask_pr_args(mask));
e7a297b0 PWJ	70	free_cpumask_var(mask);
	71
	72	return 0;
	73	}
	74
25d61578 JK	75	#ifndef is_affinity_mask_valid
	76	#define is_affinity_mask_valid(val) 1
	77	#endif
	78
1da177e4	79	int no_irq_affinity;
4b060420 MT	80	static int irq_affinity_proc_show(struct seq_file m, void v)
	81	{
	82	return show_irq_affinity(0, m, v);
	83	}
	84
	85	static int irq_affinity_list_proc_show(struct seq_file m, void v)
	86	{
	87	return show_irq_affinity(1, m, v);
	88	}
	89
	90
	91	static ssize_t write_irq_affinity(int type, struct file *file,
f18e439d	92	const char __user buffer, size_t count, loff_t pos)
1da177e4	93	{
d9dda78b	94	unsigned int irq = (int)(long)PDE_DATA(file_inode(file));
0de26520	95	cpumask_var_t new_value;
f18e439d	96	int err;
1da177e4	97
bce43032	98	if (!irq_can_set_affinity(irq) \|\| no_irq_affinity)
1da177e4 LT	99	return -EIO;
1da177e4 LT	100
0de26520 RR	101	if (!alloc_cpumask_var(&new_value, GFP_KERNEL))
	102	return -ENOMEM;
	103
4b060420 MT	104	if (type)
	105	err = cpumask_parselist_user(buffer, count, new_value);
	106	else
	107	err = cpumask_parse_user(buffer, count, new_value);
1da177e4	108	if (err)
0de26520	109	goto free_cpumask;
1da177e4	110
6bdf197b	111	if (!is_affinity_mask_valid(new_value)) {
0de26520 RR	112	err = -EINVAL;
	113	goto free_cpumask;
	114	}
25d61578	115
1da177e4 LT	116	/*
	117	* Do not allow disabling IRQs completely - it's a too easy
	118	* way to make the system unusable accidentally :-) At least
	119	* one online CPU still has to be targeted.
	120	*/
0de26520	121	if (!cpumask_intersects(new_value, cpu_online_mask)) {
eee45269 IK	122	/* Special case for empty set - allow the architecture
eee45269 IK	123	code to set default SMP affinity. */
3b8249e7	124	err = irq_select_affinity_usr(irq, new_value) ? -EINVAL : count;
0de26520 RR	125	} else {
	126	irq_set_affinity(irq, new_value);
	127	err = count;
	128	}
	129
	130	free_cpumask:
	131	free_cpumask_var(new_value);
	132	return err;
1da177e4 LT	133	}
1da177e4 LT	134
4b060420 MT	135	static ssize_t irq_affinity_proc_write(struct file *file,
	136	const char __user buffer, size_t count, loff_t pos)
	137	{
	138	return write_irq_affinity(0, file, buffer, count, pos);
	139	}
	140
	141	static ssize_t irq_affinity_list_proc_write(struct file *file,
	142	const char __user buffer, size_t count, loff_t pos)
	143	{
	144	return write_irq_affinity(1, file, buffer, count, pos);
	145	}
	146
f18e439d	147	static int irq_affinity_proc_open(struct inode inode, struct file file)
18404756	148	{
d9dda78b	149	return single_open(file, irq_affinity_proc_show, PDE_DATA(inode));
18404756 MK	150	}
18404756 MK	151
4b060420 MT	152	static int irq_affinity_list_proc_open(struct inode inode, struct file file)
4b060420 MT	153	{
d9dda78b	154	return single_open(file, irq_affinity_list_proc_show, PDE_DATA(inode));
4b060420 MT	155	}
4b060420 MT	156
e7a297b0 PWJ	157	static int irq_affinity_hint_proc_open(struct inode inode, struct file file)
e7a297b0 PWJ	158	{
d9dda78b	159	return single_open(file, irq_affinity_hint_proc_show, PDE_DATA(inode));
e7a297b0 PWJ	160	}
e7a297b0 PWJ	161
f18e439d AD	162	static const struct file_operations irq_affinity_proc_fops = {
	163	.open = irq_affinity_proc_open,
	164	.read = seq_read,
	165	.llseek = seq_lseek,
	166	.release = single_release,
	167	.write = irq_affinity_proc_write,
	168	};
	169
e7a297b0 PWJ	170	static const struct file_operations irq_affinity_hint_proc_fops = {
	171	.open = irq_affinity_hint_proc_open,
	172	.read = seq_read,
	173	.llseek = seq_lseek,
	174	.release = single_release,
	175	};
	176
4b060420 MT	177	static const struct file_operations irq_affinity_list_proc_fops = {
	178	.open = irq_affinity_list_proc_open,
	179	.read = seq_read,
	180	.llseek = seq_lseek,
	181	.release = single_release,
	182	.write = irq_affinity_list_proc_write,
	183	};
	184
f18e439d AD	185	static int default_affinity_show(struct seq_file m, void v)
f18e439d AD	186	{
c1d7f03f	187	seq_printf(m, "%*pb\n", cpumask_pr_args(irq_default_affinity));
f18e439d AD	188	return 0;
	189	}
	190
	191	static ssize_t default_affinity_write(struct file *file,
	192	const char __user buffer, size_t count, loff_t ppos)
18404756	193	{
d036e67b	194	cpumask_var_t new_value;
f18e439d	195	int err;
18404756	196
d036e67b RR	197	if (!alloc_cpumask_var(&new_value, GFP_KERNEL))
	198	return -ENOMEM;
	199
	200	err = cpumask_parse_user(buffer, count, new_value);
18404756	201	if (err)
d036e67b	202	goto out;
18404756	203
d036e67b RR	204	if (!is_affinity_mask_valid(new_value)) {
	205	err = -EINVAL;
	206	goto out;
	207	}
18404756 MK	208
	209	/*
	210	* Do not allow disabling IRQs completely - it's a too easy
	211	* way to make the system unusable accidentally :-) At least
	212	* one online CPU still has to be targeted.
	213	*/
d036e67b RR	214	if (!cpumask_intersects(new_value, cpu_online_mask)) {
	215	err = -EINVAL;
	216	goto out;
	217	}
18404756	218
d036e67b RR	219	cpumask_copy(irq_default_affinity, new_value);
d036e67b RR	220	err = count;
18404756	221
d036e67b RR	222	out:
	223	free_cpumask_var(new_value);
	224	return err;
18404756	225	}
f18e439d AD	226
	227	static int default_affinity_open(struct inode inode, struct file file)
	228	{
d9dda78b	229	return single_open(file, default_affinity_show, PDE_DATA(inode));
f18e439d AD	230	}
	231
	232	static const struct file_operations default_affinity_proc_fops = {
	233	.open = default_affinity_open,
	234	.read = seq_read,
	235	.llseek = seq_lseek,
	236	.release = single_release,
	237	.write = default_affinity_write,
	238	};
92d6b71a DS	239
	240	static int irq_node_proc_show(struct seq_file m, void v)
	241	{
	242	struct irq_desc *desc = irq_to_desc((long) m->private);
	243
6783011b	244	seq_printf(m, "%d\n", irq_desc_get_node(desc));
92d6b71a DS	245	return 0;
	246	}
	247
	248	static int irq_node_proc_open(struct inode inode, struct file file)
	249	{
d9dda78b	250	return single_open(file, irq_node_proc_show, PDE_DATA(inode));
92d6b71a DS	251	}
	252
	253	static const struct file_operations irq_node_proc_fops = {
	254	.open = irq_node_proc_open,
	255	.read = seq_read,
	256	.llseek = seq_lseek,
	257	.release = single_release,
	258	};
1da177e4 LT	259	#endif
1da177e4 LT	260
a1afb637	261	static int irq_spurious_proc_show(struct seq_file m, void v)
96d97cf0	262	{
a1afb637 AD	263	struct irq_desc *desc = irq_to_desc((long) m->private);
	264
	265	seq_printf(m, "count %u\n" "unhandled %u\n" "last_unhandled %u ms\n",
	266	desc->irq_count, desc->irqs_unhandled,
	267	jiffies_to_msecs(desc->last_unhandled));
	268	return 0;
	269	}
	270
	271	static int irq_spurious_proc_open(struct inode inode, struct file file)
	272	{
d9dda78b	273	return single_open(file, irq_spurious_proc_show, PDE_DATA(inode));
96d97cf0 AK	274	}
96d97cf0 AK	275
a1afb637 AD	276	static const struct file_operations irq_spurious_proc_fops = {
	277	.open = irq_spurious_proc_open,
	278	.read = seq_read,
	279	.llseek = seq_lseek,
	280	.release = single_release,
	281	};
	282
1da177e4 LT	283	#define MAX_NAMELEN 128
	284
	285	static int name_unique(unsigned int irq, struct irqaction *new_action)
	286	{
08678b08	287	struct irq_desc *desc = irq_to_desc(irq);
1da177e4	288	struct irqaction *action;
d2d9433a DA	289	unsigned long flags;
d2d9433a DA	290	int ret = 1;
1da177e4	291
239007b8	292	raw_spin_lock_irqsave(&desc->lock, flags);
d2d9433a	293	for (action = desc->action ; action; action = action->next) {
1da177e4	294	if ((action != new_action) && action->name &&
d2d9433a DA	295	!strcmp(new_action->name, action->name)) {
	296	ret = 0;
	297	break;
	298	}
	299	}
239007b8	300	raw_spin_unlock_irqrestore(&desc->lock, flags);
d2d9433a	301	return ret;
1da177e4 LT	302	}
	303
	304	void register_handler_proc(unsigned int irq, struct irqaction *action)
	305	{
	306	char name [MAX_NAMELEN];
08678b08	307	struct irq_desc *desc = irq_to_desc(irq);
1da177e4	308
08678b08	309	if (!desc->dir \|\| action->dir \|\| !action->name \|\|
1da177e4 LT	310	!name_unique(irq, action))
	311	return;
	312
	313	memset(name, 0, MAX_NAMELEN);
	314	snprintf(name, MAX_NAMELEN, "%s", action->name);
	315
	316	/* create /proc/irq/1234/handler/ */
08678b08	317	action->dir = proc_mkdir(name, desc->dir);
1da177e4 LT	318	}
	319
	320	#undef MAX_NAMELEN
	321
	322	#define MAX_NAMELEN 10
	323
2c6927a3	324	void register_irq_proc(unsigned int irq, struct irq_desc *desc)
1da177e4 LT	325	{
	326	char name [MAX_NAMELEN];
	327
6b8ff312	328	if (!root_irq_dir \|\| (desc->irq_data.chip == &no_irq_chip) \|\| desc->dir)
1da177e4 LT	329	return;
	330
	331	memset(name, 0, MAX_NAMELEN);
	332	sprintf(name, "%d", irq);
	333
	334	/* create /proc/irq/1234 */
08678b08	335	desc->dir = proc_mkdir(name, root_irq_dir);
c82a43d4 CG	336	if (!desc->dir)
c82a43d4 CG	337	return;
1da177e4 LT	338
1da177e4 LT	339	#ifdef CONFIG_SMP
f18e439d	340	/* create /proc/irq/<irq>/smp_affinity */
bab5c790	341	proc_create_data("smp_affinity", 0644, desc->dir,
f18e439d	342	&irq_affinity_proc_fops, (void *)(long)irq);
92d6b71a	343
e7a297b0	344	/* create /proc/irq/<irq>/affinity_hint */
bab5c790	345	proc_create_data("affinity_hint", 0444, desc->dir,
e7a297b0 PWJ	346	&irq_affinity_hint_proc_fops, (void *)(long)irq);
e7a297b0 PWJ	347
4b060420	348	/* create /proc/irq/<irq>/smp_affinity_list */
bab5c790	349	proc_create_data("smp_affinity_list", 0644, desc->dir,
4b060420 MT	350	&irq_affinity_list_proc_fops, (void *)(long)irq);
4b060420 MT	351
92d6b71a DS	352	proc_create_data("node", 0444, desc->dir,
92d6b71a DS	353	&irq_node_proc_fops, (void *)(long)irq);
1da177e4	354	#endif
96d97cf0	355
a1afb637 AD	356	proc_create_data("spurious", 0444, desc->dir,
a1afb637 AD	357	&irq_spurious_proc_fops, (void *)(long)irq);
1da177e4 LT	358	}
1da177e4 LT	359
13bfe99e TG	360	void unregister_irq_proc(unsigned int irq, struct irq_desc *desc)
	361	{
	362	char name [MAX_NAMELEN];
	363
	364	if (!root_irq_dir \|\| !desc->dir)
	365	return;
	366	#ifdef CONFIG_SMP
	367	remove_proc_entry("smp_affinity", desc->dir);
	368	remove_proc_entry("affinity_hint", desc->dir);
def945ee	369	remove_proc_entry("smp_affinity_list", desc->dir);
13bfe99e TG	370	remove_proc_entry("node", desc->dir);
	371	#endif
	372	remove_proc_entry("spurious", desc->dir);
	373
	374	memset(name, 0, MAX_NAMELEN);
	375	sprintf(name, "%u", irq);
	376	remove_proc_entry(name, root_irq_dir);
	377	}
	378
1da177e4 LT	379	#undef MAX_NAMELEN
	380
	381	void unregister_handler_proc(unsigned int irq, struct irqaction *action)
	382	{
a8ca16ea	383	proc_remove(action->dir);
1da177e4 LT	384	}
1da177e4 LT	385
3786fc71	386	static void register_default_affinity_proc(void)
18404756 MK	387	{
18404756 MK	388	#ifdef CONFIG_SMP
bab5c790	389	proc_create("irq/default_smp_affinity", 0644, NULL,
f18e439d	390	&default_affinity_proc_fops);
18404756 MK	391	#endif
	392	}
	393
1da177e4 LT	394	void init_irq_proc(void)
1da177e4 LT	395	{
2c6927a3 YL	396	unsigned int irq;
2c6927a3 YL	397	struct irq_desc *desc;
1da177e4 LT	398
	399	/* create /proc/irq */
	400	root_irq_dir = proc_mkdir("irq", NULL);
	401	if (!root_irq_dir)
	402	return;
	403
18404756 MK	404	register_default_affinity_proc();
18404756 MK	405
1da177e4 LT	406	/*
	407	* Create entries for all existing IRQs.
	408	*/
0b8f1efa YL	409	for_each_irq_desc(irq, desc) {
	410	if (!desc)
	411	continue;
	412
2c6927a3	413	register_irq_proc(irq, desc);
0b8f1efa	414	}
1da177e4 LT	415	}
1da177e4 LT	416
c78b9b65 TG	417	#ifdef CONFIG_GENERIC_IRQ_SHOW
	418
	419	int __weak arch_show_interrupts(struct seq_file *p, int prec)
	420	{
	421	return 0;
	422	}
	423
a6e120ed TG	424	#ifndef ACTUAL_NR_IRQS
	425	# define ACTUAL_NR_IRQS nr_irqs
	426	#endif
	427
c78b9b65 TG	428	int show_interrupts(struct seq_file p, void v)
	429	{
	430	static int prec;
	431
	432	unsigned long flags, any_count = 0;
	433	int i = (loff_t ) v, j;
	434	struct irqaction *action;
	435	struct irq_desc *desc;
	436
a6e120ed	437	if (i > ACTUAL_NR_IRQS)
c78b9b65 TG	438	return 0;
c78b9b65 TG	439
a6e120ed	440	if (i == ACTUAL_NR_IRQS)
c78b9b65 TG	441	return arch_show_interrupts(p, prec);
	442
	443	/* print header and calculate the width of the first column */
	444	if (i == 0) {
	445	for (prec = 3, j = 1000; prec < 10 && j <= nr_irqs; ++prec)
	446	j *= 10;
	447
	448	seq_printf(p, "%*s", prec + 8, "");
	449	for_each_online_cpu(j)
	450	seq_printf(p, "CPU%-8d", j);
	451	seq_putc(p, '\n');
	452	}
	453
c291ee62	454	irq_lock_sparse();
c78b9b65 TG	455	desc = irq_to_desc(i);
c78b9b65 TG	456	if (!desc)
c291ee62	457	goto outsparse;
c78b9b65 TG	458
	459	raw_spin_lock_irqsave(&desc->lock, flags);
	460	for_each_online_cpu(j)
	461	any_count \|= kstat_irqs_cpu(i, j);
	462	action = desc->action;
	463	if (!action && !any_count)
	464	goto out;
	465
	466	seq_printf(p, "%*d: ", prec, i);
	467	for_each_online_cpu(j)
	468	seq_printf(p, "%10u ", kstat_irqs_cpu(i, j));
ab7798ff TG	469
	470	if (desc->irq_data.chip) {
	471	if (desc->irq_data.chip->irq_print_chip)
	472	desc->irq_data.chip->irq_print_chip(&desc->irq_data, p);
	473	else if (desc->irq_data.chip->name)
	474	seq_printf(p, " %8s", desc->irq_data.chip->name);
	475	else
	476	seq_printf(p, " %8s", "-");
	477	} else {
	478	seq_printf(p, " %8s", "None");
	479	}
c12d2f42 GL	480	if (desc->irq_data.domain)
c12d2f42 GL	481	seq_printf(p, " %*d", prec, (int) desc->irq_data.hwirq);
94b2c363	482	#ifdef CONFIG_GENERIC_IRQ_SHOW_LEVEL
ab7798ff TG	483	seq_printf(p, " %-8s", irqd_is_level_type(&desc->irq_data) ? "Level" : "Edge");
ab7798ff TG	484	#endif
ee0401ec TG	485	if (desc->name)
ee0401ec TG	486	seq_printf(p, "-%-8s", desc->name);
c78b9b65 TG	487
	488	if (action) {
	489	seq_printf(p, " %s", action->name);
	490	while ((action = action->next) != NULL)
	491	seq_printf(p, ", %s", action->name);
	492	}
	493
	494	seq_putc(p, '\n');
	495	out:
	496	raw_spin_unlock_irqrestore(&desc->lock, flags);
c291ee62 TG	497	outsparse:
c291ee62 TG	498	irq_unlock_sparse();
c78b9b65 TG	499	return 0;
	500	}
	501	#endif