[linux-2.6-block.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_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');
	}

	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);
6b8ff312	42	const struct cpumask *mask = desc->irq_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 MT	48	if (type)
	49	seq_cpumask_list(m, mask);
	50	else
	51	seq_cpumask(m, mask);
f18e439d AD	52	seq_putc(m, '\n');
f18e439d AD	53	return 0;
1da177e4 LT	54	}
1da177e4 LT	55
e7a297b0 PWJ	56	static int irq_affinity_hint_proc_show(struct seq_file m, void v)
	57	{
	58	struct irq_desc *desc = irq_to_desc((long)m->private);
	59	unsigned long flags;
	60	cpumask_var_t mask;
	61
4308ad80	62	if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
e7a297b0 PWJ	63	return -ENOMEM;
	64
	65	raw_spin_lock_irqsave(&desc->lock, flags);
	66	if (desc->affinity_hint)
	67	cpumask_copy(mask, desc->affinity_hint);
e7a297b0 PWJ	68	raw_spin_unlock_irqrestore(&desc->lock, flags);
	69
	70	seq_cpumask(m, mask);
	71	seq_putc(m, '\n');
	72	free_cpumask_var(mask);
	73
	74	return 0;
	75	}
	76
25d61578 JK	77	#ifndef is_affinity_mask_valid
	78	#define is_affinity_mask_valid(val) 1
	79	#endif
	80
1da177e4	81	int no_irq_affinity;
4b060420 MT	82	static int irq_affinity_proc_show(struct seq_file m, void v)
	83	{
	84	return show_irq_affinity(0, m, v);
	85	}
	86
	87	static int irq_affinity_list_proc_show(struct seq_file m, void v)
	88	{
	89	return show_irq_affinity(1, m, v);
	90	}
	91
	92
	93	static ssize_t write_irq_affinity(int type, struct file *file,
f18e439d	94	const char __user buffer, size_t count, loff_t pos)
1da177e4	95	{
d9dda78b	96	unsigned int irq = (int)(long)PDE_DATA(file_inode(file));
0de26520	97	cpumask_var_t new_value;
f18e439d	98	int err;
1da177e4	99
bce43032	100	if (!irq_can_set_affinity(irq) \|\| no_irq_affinity)
1da177e4 LT	101	return -EIO;
1da177e4 LT	102
0de26520 RR	103	if (!alloc_cpumask_var(&new_value, GFP_KERNEL))
	104	return -ENOMEM;
	105
4b060420 MT	106	if (type)
	107	err = cpumask_parselist_user(buffer, count, new_value);
	108	else
	109	err = cpumask_parse_user(buffer, count, new_value);
1da177e4	110	if (err)
0de26520	111	goto free_cpumask;
1da177e4	112
6bdf197b	113	if (!is_affinity_mask_valid(new_value)) {
0de26520 RR	114	err = -EINVAL;
	115	goto free_cpumask;
	116	}
25d61578	117
1da177e4 LT	118	/*
	119	* Do not allow disabling IRQs completely - it's a too easy
	120	* way to make the system unusable accidentally :-) At least
	121	* one online CPU still has to be targeted.
	122	*/
0de26520	123	if (!cpumask_intersects(new_value, cpu_online_mask)) {
eee45269 IK	124	/* Special case for empty set - allow the architecture
eee45269 IK	125	code to set default SMP affinity. */
3b8249e7	126	err = irq_select_affinity_usr(irq, new_value) ? -EINVAL : count;
0de26520 RR	127	} else {
	128	irq_set_affinity(irq, new_value);
	129	err = count;
	130	}
	131
	132	free_cpumask:
	133	free_cpumask_var(new_value);
	134	return err;
1da177e4 LT	135	}
1da177e4 LT	136
4b060420 MT	137	static ssize_t irq_affinity_proc_write(struct file *file,
	138	const char __user buffer, size_t count, loff_t pos)
	139	{
	140	return write_irq_affinity(0, file, buffer, count, pos);
	141	}
	142
	143	static ssize_t irq_affinity_list_proc_write(struct file *file,
	144	const char __user buffer, size_t count, loff_t pos)
	145	{
	146	return write_irq_affinity(1, file, buffer, count, pos);
	147	}
	148
f18e439d	149	static int irq_affinity_proc_open(struct inode inode, struct file file)
18404756	150	{
d9dda78b	151	return single_open(file, irq_affinity_proc_show, PDE_DATA(inode));
18404756 MK	152	}
18404756 MK	153
4b060420 MT	154	static int irq_affinity_list_proc_open(struct inode inode, struct file file)
4b060420 MT	155	{
d9dda78b	156	return single_open(file, irq_affinity_list_proc_show, PDE_DATA(inode));
4b060420 MT	157	}
4b060420 MT	158
e7a297b0 PWJ	159	static int irq_affinity_hint_proc_open(struct inode inode, struct file file)
e7a297b0 PWJ	160	{
d9dda78b	161	return single_open(file, irq_affinity_hint_proc_show, PDE_DATA(inode));
e7a297b0 PWJ	162	}
e7a297b0 PWJ	163
f18e439d AD	164	static const struct file_operations irq_affinity_proc_fops = {
	165	.open = irq_affinity_proc_open,
	166	.read = seq_read,
	167	.llseek = seq_lseek,
	168	.release = single_release,
	169	.write = irq_affinity_proc_write,
	170	};
	171
e7a297b0 PWJ	172	static const struct file_operations irq_affinity_hint_proc_fops = {
	173	.open = irq_affinity_hint_proc_open,
	174	.read = seq_read,
	175	.llseek = seq_lseek,
	176	.release = single_release,
	177	};
	178
4b060420 MT	179	static const struct file_operations irq_affinity_list_proc_fops = {
	180	.open = irq_affinity_list_proc_open,
	181	.read = seq_read,
	182	.llseek = seq_lseek,
	183	.release = single_release,
	184	.write = irq_affinity_list_proc_write,
	185	};
	186
f18e439d AD	187	static int default_affinity_show(struct seq_file m, void v)
f18e439d AD	188	{
d036e67b	189	seq_cpumask(m, irq_default_affinity);
f18e439d AD	190	seq_putc(m, '\n');
	191	return 0;
	192	}
	193
	194	static ssize_t default_affinity_write(struct file *file,
	195	const char __user buffer, size_t count, loff_t ppos)
18404756	196	{
d036e67b	197	cpumask_var_t new_value;
f18e439d	198	int err;
18404756	199
d036e67b RR	200	if (!alloc_cpumask_var(&new_value, GFP_KERNEL))
	201	return -ENOMEM;
	202
	203	err = cpumask_parse_user(buffer, count, new_value);
18404756	204	if (err)
d036e67b	205	goto out;
18404756	206
d036e67b RR	207	if (!is_affinity_mask_valid(new_value)) {
	208	err = -EINVAL;
	209	goto out;
	210	}
18404756 MK	211
	212	/*
	213	* Do not allow disabling IRQs completely - it's a too easy
	214	* way to make the system unusable accidentally :-) At least
	215	* one online CPU still has to be targeted.
	216	*/
d036e67b RR	217	if (!cpumask_intersects(new_value, cpu_online_mask)) {
	218	err = -EINVAL;
	219	goto out;
	220	}
18404756	221
d036e67b RR	222	cpumask_copy(irq_default_affinity, new_value);
d036e67b RR	223	err = count;
18404756	224
d036e67b RR	225	out:
	226	free_cpumask_var(new_value);
	227	return err;
18404756	228	}
f18e439d AD	229
	230	static int default_affinity_open(struct inode inode, struct file file)
	231	{
d9dda78b	232	return single_open(file, default_affinity_show, PDE_DATA(inode));
f18e439d AD	233	}
	234
	235	static const struct file_operations default_affinity_proc_fops = {
	236	.open = default_affinity_open,
	237	.read = seq_read,
	238	.llseek = seq_lseek,
	239	.release = single_release,
	240	.write = default_affinity_write,
	241	};
92d6b71a DS	242
	243	static int irq_node_proc_show(struct seq_file m, void v)
	244	{
	245	struct irq_desc *desc = irq_to_desc((long) m->private);
	246
6b8ff312	247	seq_printf(m, "%d\n", desc->irq_data.node);
92d6b71a DS	248	return 0;
	249	}
	250
	251	static int irq_node_proc_open(struct inode inode, struct file file)
	252	{
d9dda78b	253	return single_open(file, irq_node_proc_show, PDE_DATA(inode));
92d6b71a DS	254	}
	255
	256	static const struct file_operations irq_node_proc_fops = {
	257	.open = irq_node_proc_open,
	258	.read = seq_read,
	259	.llseek = seq_lseek,
	260	.release = single_release,
	261	};
1da177e4 LT	262	#endif
1da177e4 LT	263
a1afb637	264	static int irq_spurious_proc_show(struct seq_file m, void v)
96d97cf0	265	{
a1afb637 AD	266	struct irq_desc *desc = irq_to_desc((long) m->private);
	267
	268	seq_printf(m, "count %u\n" "unhandled %u\n" "last_unhandled %u ms\n",
	269	desc->irq_count, desc->irqs_unhandled,
	270	jiffies_to_msecs(desc->last_unhandled));
	271	return 0;
	272	}
	273
	274	static int irq_spurious_proc_open(struct inode inode, struct file file)
	275	{
d9dda78b	276	return single_open(file, irq_spurious_proc_show, PDE_DATA(inode));
96d97cf0 AK	277	}
96d97cf0 AK	278
a1afb637 AD	279	static const struct file_operations irq_spurious_proc_fops = {
	280	.open = irq_spurious_proc_open,
	281	.read = seq_read,
	282	.llseek = seq_lseek,
	283	.release = single_release,
	284	};
	285
1da177e4 LT	286	#define MAX_NAMELEN 128
	287
	288	static int name_unique(unsigned int irq, struct irqaction *new_action)
	289	{
08678b08	290	struct irq_desc *desc = irq_to_desc(irq);
1da177e4	291	struct irqaction *action;
d2d9433a DA	292	unsigned long flags;
d2d9433a DA	293	int ret = 1;
1da177e4	294
239007b8	295	raw_spin_lock_irqsave(&desc->lock, flags);
d2d9433a	296	for (action = desc->action ; action; action = action->next) {
1da177e4	297	if ((action != new_action) && action->name &&
d2d9433a DA	298	!strcmp(new_action->name, action->name)) {
	299	ret = 0;
	300	break;
	301	}
	302	}
239007b8	303	raw_spin_unlock_irqrestore(&desc->lock, flags);
d2d9433a	304	return ret;
1da177e4 LT	305	}
	306
	307	void register_handler_proc(unsigned int irq, struct irqaction *action)
	308	{
	309	char name [MAX_NAMELEN];
08678b08	310	struct irq_desc *desc = irq_to_desc(irq);
1da177e4	311
08678b08	312	if (!desc->dir \|\| action->dir \|\| !action->name \|\|
1da177e4 LT	313	!name_unique(irq, action))
	314	return;
	315
	316	memset(name, 0, MAX_NAMELEN);
	317	snprintf(name, MAX_NAMELEN, "%s", action->name);
	318
	319	/* create /proc/irq/1234/handler/ */
08678b08	320	action->dir = proc_mkdir(name, desc->dir);
1da177e4 LT	321	}
	322
	323	#undef MAX_NAMELEN
	324
	325	#define MAX_NAMELEN 10
	326
2c6927a3	327	void register_irq_proc(unsigned int irq, struct irq_desc *desc)
1da177e4 LT	328	{
	329	char name [MAX_NAMELEN];
	330
6b8ff312	331	if (!root_irq_dir \|\| (desc->irq_data.chip == &no_irq_chip) \|\| desc->dir)
1da177e4 LT	332	return;
	333
	334	memset(name, 0, MAX_NAMELEN);
	335	sprintf(name, "%d", irq);
	336
	337	/* create /proc/irq/1234 */
08678b08	338	desc->dir = proc_mkdir(name, root_irq_dir);
c82a43d4 CG	339	if (!desc->dir)
c82a43d4 CG	340	return;
1da177e4 LT	341
1da177e4 LT	342	#ifdef CONFIG_SMP
f18e439d	343	/* create /proc/irq/<irq>/smp_affinity */
bab5c790	344	proc_create_data("smp_affinity", 0644, desc->dir,
f18e439d	345	&irq_affinity_proc_fops, (void *)(long)irq);
92d6b71a	346
e7a297b0	347	/* create /proc/irq/<irq>/affinity_hint */
bab5c790	348	proc_create_data("affinity_hint", 0444, desc->dir,
e7a297b0 PWJ	349	&irq_affinity_hint_proc_fops, (void *)(long)irq);
e7a297b0 PWJ	350
4b060420	351	/* create /proc/irq/<irq>/smp_affinity_list */
bab5c790	352	proc_create_data("smp_affinity_list", 0644, desc->dir,
4b060420 MT	353	&irq_affinity_list_proc_fops, (void *)(long)irq);
4b060420 MT	354
92d6b71a DS	355	proc_create_data("node", 0444, desc->dir,
92d6b71a DS	356	&irq_node_proc_fops, (void *)(long)irq);
1da177e4	357	#endif
96d97cf0	358
a1afb637 AD	359	proc_create_data("spurious", 0444, desc->dir,
a1afb637 AD	360	&irq_spurious_proc_fops, (void *)(long)irq);
1da177e4 LT	361	}
1da177e4 LT	362
13bfe99e TG	363	void unregister_irq_proc(unsigned int irq, struct irq_desc *desc)
	364	{
	365	char name [MAX_NAMELEN];
	366
	367	if (!root_irq_dir \|\| !desc->dir)
	368	return;
	369	#ifdef CONFIG_SMP
	370	remove_proc_entry("smp_affinity", desc->dir);
	371	remove_proc_entry("affinity_hint", desc->dir);
def945ee	372	remove_proc_entry("smp_affinity_list", desc->dir);
13bfe99e TG	373	remove_proc_entry("node", desc->dir);
	374	#endif
	375	remove_proc_entry("spurious", desc->dir);
	376
	377	memset(name, 0, MAX_NAMELEN);
	378	sprintf(name, "%u", irq);
	379	remove_proc_entry(name, root_irq_dir);
	380	}
	381
1da177e4 LT	382	#undef MAX_NAMELEN
	383
	384	void unregister_handler_proc(unsigned int irq, struct irqaction *action)
	385	{
a8ca16ea	386	proc_remove(action->dir);
1da177e4 LT	387	}
1da177e4 LT	388
3786fc71	389	static void register_default_affinity_proc(void)
18404756 MK	390	{
18404756 MK	391	#ifdef CONFIG_SMP
bab5c790	392	proc_create("irq/default_smp_affinity", 0644, NULL,
f18e439d	393	&default_affinity_proc_fops);
18404756 MK	394	#endif
	395	}
	396
1da177e4 LT	397	void init_irq_proc(void)
1da177e4 LT	398	{
2c6927a3 YL	399	unsigned int irq;
2c6927a3 YL	400	struct irq_desc *desc;
1da177e4 LT	401
	402	/* create /proc/irq */
	403	root_irq_dir = proc_mkdir("irq", NULL);
	404	if (!root_irq_dir)
	405	return;
	406
18404756 MK	407	register_default_affinity_proc();
18404756 MK	408
1da177e4 LT	409	/*
	410	* Create entries for all existing IRQs.
	411	*/
0b8f1efa YL	412	for_each_irq_desc(irq, desc) {
	413	if (!desc)
	414	continue;
	415
2c6927a3	416	register_irq_proc(irq, desc);
0b8f1efa	417	}
1da177e4 LT	418	}
1da177e4 LT	419
c78b9b65 TG	420	#ifdef CONFIG_GENERIC_IRQ_SHOW
	421
	422	int __weak arch_show_interrupts(struct seq_file *p, int prec)
	423	{
	424	return 0;
	425	}
	426
a6e120ed TG	427	#ifndef ACTUAL_NR_IRQS
	428	# define ACTUAL_NR_IRQS nr_irqs
	429	#endif
	430
c78b9b65 TG	431	int show_interrupts(struct seq_file p, void v)
	432	{
	433	static int prec;
	434
	435	unsigned long flags, any_count = 0;
	436	int i = (loff_t ) v, j;
	437	struct irqaction *action;
	438	struct irq_desc *desc;
	439
a6e120ed	440	if (i > ACTUAL_NR_IRQS)
c78b9b65 TG	441	return 0;
c78b9b65 TG	442
a6e120ed	443	if (i == ACTUAL_NR_IRQS)
c78b9b65 TG	444	return arch_show_interrupts(p, prec);
	445
	446	/* print header and calculate the width of the first column */
	447	if (i == 0) {
	448	for (prec = 3, j = 1000; prec < 10 && j <= nr_irqs; ++prec)
	449	j *= 10;
	450
	451	seq_printf(p, "%*s", prec + 8, "");
	452	for_each_online_cpu(j)
	453	seq_printf(p, "CPU%-8d", j);
	454	seq_putc(p, '\n');
	455	}
	456
c291ee62	457	irq_lock_sparse();
c78b9b65 TG	458	desc = irq_to_desc(i);
c78b9b65 TG	459	if (!desc)
c291ee62	460	goto outsparse;
c78b9b65 TG	461
	462	raw_spin_lock_irqsave(&desc->lock, flags);
	463	for_each_online_cpu(j)
	464	any_count \|= kstat_irqs_cpu(i, j);
	465	action = desc->action;
	466	if (!action && !any_count)
	467	goto out;
	468
	469	seq_printf(p, "%*d: ", prec, i);
	470	for_each_online_cpu(j)
	471	seq_printf(p, "%10u ", kstat_irqs_cpu(i, j));
ab7798ff TG	472
	473	if (desc->irq_data.chip) {
	474	if (desc->irq_data.chip->irq_print_chip)
	475	desc->irq_data.chip->irq_print_chip(&desc->irq_data, p);
	476	else if (desc->irq_data.chip->name)
	477	seq_printf(p, " %8s", desc->irq_data.chip->name);
	478	else
	479	seq_printf(p, " %8s", "-");
	480	} else {
	481	seq_printf(p, " %8s", "None");
	482	}
c12d2f42 GL	483	if (desc->irq_data.domain)
c12d2f42 GL	484	seq_printf(p, " %*d", prec, (int) desc->irq_data.hwirq);
94b2c363	485	#ifdef CONFIG_GENERIC_IRQ_SHOW_LEVEL
ab7798ff TG	486	seq_printf(p, " %-8s", irqd_is_level_type(&desc->irq_data) ? "Level" : "Edge");
ab7798ff TG	487	#endif
ee0401ec TG	488	if (desc->name)
ee0401ec TG	489	seq_printf(p, "-%-8s", desc->name);
c78b9b65 TG	490
	491	if (action) {
	492	seq_printf(p, " %s", action->name);
	493	while ((action = action->next) != NULL)
	494	seq_printf(p, ", %s", action->name);
	495	}
	496
	497	seq_putc(p, '\n');
	498	out:
	499	raw_spin_unlock_irqrestore(&desc->lock, flags);
c291ee62 TG	500	outsparse:
c291ee62 TG	501	irq_unlock_sparse();
c78b9b65 TG	502	return 0;
	503	}
	504	#endif