[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 <linux/mutex.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_usr(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_each_action_of_desc(desc, action) {
		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;

	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)
{
	static DEFINE_MUTEX(register_lock);
	char name [MAX_NAMELEN];

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

	/*
	 * irq directories are registered only when a handler is
	 * added, not when the descriptor is created, so multiple
	 * tasks might try to register at the same time.
	 */
	mutex_lock(&register_lock);

	if (desc->dir)
		goto out_unlock;

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

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

#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);

out_unlock:
	mutex_unlock(&register_lock);
}

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);

	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)
		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 || irq_desc_is_chained(desc)) && !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>
95c2b175	15	#include <linux/mutex.h>
1da177e4	16
97a41e26 AB	17	#include "internals.h"
97a41e26 AB	18
c291ee62 TG	19	/*
	20	* Access rules:
	21	*
	22	* procfs protects read/write of /proc/irq/N/ files against a
	23	* concurrent free of the interrupt descriptor. remove_proc_entry()
	24	* immediately prevents new read/writes to happen and waits for
	25	* already running read/write functions to complete.
	26	*
	27	* We remove the proc entries first and then delete the interrupt
	28	* descriptor from the radix tree and free it. So it is guaranteed
	29	* that irq_to_desc(N) is valid as long as the read/writes are
	30	* permitted by procfs.
	31	*
	32	* The read from /proc/interrupts is a different problem because there
	33	* is no protection. So the lookup and the access to irqdesc
	34	* information must be protected by sparse_irq_lock.
	35	*/
4a733ee1	36	static struct proc_dir_entry *root_irq_dir;
1da177e4 LT	37
	38	#ifdef CONFIG_SMP
	39
4b060420	40	static int show_irq_affinity(int type, struct seq_file m, void v)
1da177e4	41	{
08678b08	42	struct irq_desc *desc = irq_to_desc((long)m->private);
9df872fa	43	const struct cpumask *mask = desc->irq_common_data.affinity;
42ee2b74 AK	44
42ee2b74 AK	45	#ifdef CONFIG_GENERIC_PENDING_IRQ
f230b6d5	46	if (irqd_is_setaffinity_pending(&desc->irq_data))
7f7ace0c	47	mask = desc->pending_mask;
42ee2b74	48	#endif
4b060420	49	if (type)
c1d7f03f	50	seq_printf(m, "%*pbl\n", cpumask_pr_args(mask));
4b060420	51	else
c1d7f03f	52	seq_printf(m, "%*pb\n", cpumask_pr_args(mask));
f18e439d	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);
e7a297b0 PWJ	69
c1d7f03f	70	seq_printf(m, "%*pb\n", cpumask_pr_args(mask));
e7a297b0 PWJ	71	free_cpumask_var(mask);
	72
	73	return 0;
	74	}
	75
25d61578 JK	76	#ifndef is_affinity_mask_valid
	77	#define is_affinity_mask_valid(val) 1
	78	#endif
	79
1da177e4	80	int no_irq_affinity;
4b060420 MT	81	static int irq_affinity_proc_show(struct seq_file m, void v)
	82	{
	83	return show_irq_affinity(0, m, v);
	84	}
	85
	86	static int irq_affinity_list_proc_show(struct seq_file m, void v)
	87	{
	88	return show_irq_affinity(1, m, v);
	89	}
	90
	91
	92	static ssize_t write_irq_affinity(int type, struct file *file,
f18e439d	93	const char __user buffer, size_t count, loff_t pos)
1da177e4	94	{
d9dda78b	95	unsigned int irq = (int)(long)PDE_DATA(file_inode(file));
0de26520	96	cpumask_var_t new_value;
f18e439d	97	int err;
1da177e4	98
9c255583	99	if (!irq_can_set_affinity_usr(irq) \|\| no_irq_affinity)
1da177e4 LT	100	return -EIO;
1da177e4 LT	101
0de26520 RR	102	if (!alloc_cpumask_var(&new_value, GFP_KERNEL))
	103	return -ENOMEM;
	104
4b060420 MT	105	if (type)
	106	err = cpumask_parselist_user(buffer, count, new_value);
	107	else
	108	err = cpumask_parse_user(buffer, count, new_value);
1da177e4	109	if (err)
0de26520	110	goto free_cpumask;
1da177e4	111
6bdf197b	112	if (!is_affinity_mask_valid(new_value)) {
0de26520 RR	113	err = -EINVAL;
	114	goto free_cpumask;
	115	}
25d61578	116
1da177e4 LT	117	/*
	118	* Do not allow disabling IRQs completely - it's a too easy
	119	* way to make the system unusable accidentally :-) At least
	120	* one online CPU still has to be targeted.
	121	*/
0de26520	122	if (!cpumask_intersects(new_value, cpu_online_mask)) {
eee45269 IK	123	/* Special case for empty set - allow the architecture
eee45269 IK	124	code to set default SMP affinity. */
3b8249e7	125	err = irq_select_affinity_usr(irq, new_value) ? -EINVAL : count;
0de26520 RR	126	} else {
	127	irq_set_affinity(irq, new_value);
	128	err = count;
	129	}
	130
	131	free_cpumask:
	132	free_cpumask_var(new_value);
	133	return err;
1da177e4 LT	134	}
1da177e4 LT	135
4b060420 MT	136	static ssize_t irq_affinity_proc_write(struct file *file,
	137	const char __user buffer, size_t count, loff_t pos)
	138	{
	139	return write_irq_affinity(0, file, buffer, count, pos);
	140	}
	141
	142	static ssize_t irq_affinity_list_proc_write(struct file *file,
	143	const char __user buffer, size_t count, loff_t pos)
	144	{
	145	return write_irq_affinity(1, file, buffer, count, pos);
	146	}
	147
f18e439d	148	static int irq_affinity_proc_open(struct inode inode, struct file file)
18404756	149	{
d9dda78b	150	return single_open(file, irq_affinity_proc_show, PDE_DATA(inode));
18404756 MK	151	}
18404756 MK	152
4b060420 MT	153	static int irq_affinity_list_proc_open(struct inode inode, struct file file)
4b060420 MT	154	{
d9dda78b	155	return single_open(file, irq_affinity_list_proc_show, PDE_DATA(inode));
4b060420 MT	156	}
4b060420 MT	157
e7a297b0 PWJ	158	static int irq_affinity_hint_proc_open(struct inode inode, struct file file)
e7a297b0 PWJ	159	{
d9dda78b	160	return single_open(file, irq_affinity_hint_proc_show, PDE_DATA(inode));
e7a297b0 PWJ	161	}
e7a297b0 PWJ	162
f18e439d AD	163	static const struct file_operations irq_affinity_proc_fops = {
	164	.open = irq_affinity_proc_open,
	165	.read = seq_read,
	166	.llseek = seq_lseek,
	167	.release = single_release,
	168	.write = irq_affinity_proc_write,
	169	};
	170
e7a297b0 PWJ	171	static const struct file_operations irq_affinity_hint_proc_fops = {
	172	.open = irq_affinity_hint_proc_open,
	173	.read = seq_read,
	174	.llseek = seq_lseek,
	175	.release = single_release,
	176	};
	177
4b060420 MT	178	static const struct file_operations irq_affinity_list_proc_fops = {
	179	.open = irq_affinity_list_proc_open,
	180	.read = seq_read,
	181	.llseek = seq_lseek,
	182	.release = single_release,
	183	.write = irq_affinity_list_proc_write,
	184	};
	185
f18e439d AD	186	static int default_affinity_show(struct seq_file m, void v)
f18e439d AD	187	{
c1d7f03f	188	seq_printf(m, "%*pb\n", cpumask_pr_args(irq_default_affinity));
f18e439d AD	189	return 0;
	190	}
	191
	192	static ssize_t default_affinity_write(struct file *file,
	193	const char __user buffer, size_t count, loff_t ppos)
18404756	194	{
d036e67b	195	cpumask_var_t new_value;
f18e439d	196	int err;
18404756	197
d036e67b RR	198	if (!alloc_cpumask_var(&new_value, GFP_KERNEL))
	199	return -ENOMEM;
	200
	201	err = cpumask_parse_user(buffer, count, new_value);
18404756	202	if (err)
d036e67b	203	goto out;
18404756	204
d036e67b RR	205	if (!is_affinity_mask_valid(new_value)) {
	206	err = -EINVAL;
	207	goto out;
	208	}
18404756 MK	209
	210	/*
	211	* Do not allow disabling IRQs completely - it's a too easy
	212	* way to make the system unusable accidentally :-) At least
	213	* one online CPU still has to be targeted.
	214	*/
d036e67b RR	215	if (!cpumask_intersects(new_value, cpu_online_mask)) {
	216	err = -EINVAL;
	217	goto out;
	218	}
18404756	219
d036e67b RR	220	cpumask_copy(irq_default_affinity, new_value);
d036e67b RR	221	err = count;
18404756	222
d036e67b RR	223	out:
	224	free_cpumask_var(new_value);
	225	return err;
18404756	226	}
f18e439d AD	227
	228	static int default_affinity_open(struct inode inode, struct file file)
	229	{
d9dda78b	230	return single_open(file, default_affinity_show, PDE_DATA(inode));
f18e439d AD	231	}
	232
	233	static const struct file_operations default_affinity_proc_fops = {
	234	.open = default_affinity_open,
	235	.read = seq_read,
	236	.llseek = seq_lseek,
	237	.release = single_release,
	238	.write = default_affinity_write,
	239	};
92d6b71a DS	240
	241	static int irq_node_proc_show(struct seq_file m, void v)
	242	{
	243	struct irq_desc *desc = irq_to_desc((long) m->private);
	244
6783011b	245	seq_printf(m, "%d\n", irq_desc_get_node(desc));
92d6b71a DS	246	return 0;
	247	}
	248
	249	static int irq_node_proc_open(struct inode inode, struct file file)
	250	{
d9dda78b	251	return single_open(file, irq_node_proc_show, PDE_DATA(inode));
92d6b71a DS	252	}
	253
	254	static const struct file_operations irq_node_proc_fops = {
	255	.open = irq_node_proc_open,
	256	.read = seq_read,
	257	.llseek = seq_lseek,
	258	.release = single_release,
	259	};
1da177e4 LT	260	#endif
1da177e4 LT	261
a1afb637	262	static int irq_spurious_proc_show(struct seq_file m, void v)
96d97cf0	263	{
a1afb637 AD	264	struct irq_desc *desc = irq_to_desc((long) m->private);
	265
	266	seq_printf(m, "count %u\n" "unhandled %u\n" "last_unhandled %u ms\n",
	267	desc->irq_count, desc->irqs_unhandled,
	268	jiffies_to_msecs(desc->last_unhandled));
	269	return 0;
	270	}
	271
	272	static int irq_spurious_proc_open(struct inode inode, struct file file)
	273	{
d9dda78b	274	return single_open(file, irq_spurious_proc_show, PDE_DATA(inode));
96d97cf0 AK	275	}
96d97cf0 AK	276
a1afb637 AD	277	static const struct file_operations irq_spurious_proc_fops = {
	278	.open = irq_spurious_proc_open,
	279	.read = seq_read,
	280	.llseek = seq_lseek,
	281	.release = single_release,
	282	};
	283
1da177e4 LT	284	#define MAX_NAMELEN 128
	285
	286	static int name_unique(unsigned int irq, struct irqaction *new_action)
	287	{
08678b08	288	struct irq_desc *desc = irq_to_desc(irq);
1da177e4	289	struct irqaction *action;
d2d9433a DA	290	unsigned long flags;
d2d9433a DA	291	int ret = 1;
1da177e4	292
239007b8	293	raw_spin_lock_irqsave(&desc->lock, flags);
f944b5a7	294	for_each_action_of_desc(desc, action) {
1da177e4	295	if ((action != new_action) && action->name &&
d2d9433a DA	296	!strcmp(new_action->name, action->name)) {
	297	ret = 0;
	298	break;
	299	}
	300	}
239007b8	301	raw_spin_unlock_irqrestore(&desc->lock, flags);
d2d9433a	302	return ret;
1da177e4 LT	303	}
	304
	305	void register_handler_proc(unsigned int irq, struct irqaction *action)
	306	{
	307	char name [MAX_NAMELEN];
08678b08	308	struct irq_desc *desc = irq_to_desc(irq);
1da177e4	309
08678b08	310	if (!desc->dir \|\| action->dir \|\| !action->name \|\|
1da177e4 LT	311	!name_unique(irq, action))
	312	return;
	313
1da177e4 LT	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	325	{
95c2b175	326	static DEFINE_MUTEX(register_lock);
1da177e4 LT	327	char name [MAX_NAMELEN];
1da177e4 LT	328
95c2b175	329	if (!root_irq_dir \|\| (desc->irq_data.chip == &no_irq_chip))
1da177e4 LT	330	return;
1da177e4 LT	331
95c2b175 BH	332	/*
	333	* irq directories are registered only when a handler is
	334	* added, not when the descriptor is created, so multiple
	335	* tasks might try to register at the same time.
	336	*/
	337	mutex_lock(&register_lock);
	338
	339	if (desc->dir)
	340	goto out_unlock;
	341
1da177e4 LT	342	sprintf(name, "%d", irq);
	343
	344	/* create /proc/irq/1234 */
08678b08	345	desc->dir = proc_mkdir(name, root_irq_dir);
c82a43d4	346	if (!desc->dir)
95c2b175	347	goto out_unlock;
1da177e4 LT	348
1da177e4 LT	349	#ifdef CONFIG_SMP
f18e439d	350	/* create /proc/irq/<irq>/smp_affinity */
bab5c790	351	proc_create_data("smp_affinity", 0644, desc->dir,
f18e439d	352	&irq_affinity_proc_fops, (void *)(long)irq);
92d6b71a	353
e7a297b0	354	/* create /proc/irq/<irq>/affinity_hint */
bab5c790	355	proc_create_data("affinity_hint", 0444, desc->dir,
e7a297b0 PWJ	356	&irq_affinity_hint_proc_fops, (void *)(long)irq);
e7a297b0 PWJ	357
4b060420	358	/* create /proc/irq/<irq>/smp_affinity_list */
bab5c790	359	proc_create_data("smp_affinity_list", 0644, desc->dir,
4b060420 MT	360	&irq_affinity_list_proc_fops, (void *)(long)irq);
4b060420 MT	361
92d6b71a DS	362	proc_create_data("node", 0444, desc->dir,
92d6b71a DS	363	&irq_node_proc_fops, (void *)(long)irq);
1da177e4	364	#endif
96d97cf0	365
a1afb637 AD	366	proc_create_data("spurious", 0444, desc->dir,
a1afb637 AD	367	&irq_spurious_proc_fops, (void *)(long)irq);
95c2b175 BH	368
	369	out_unlock:
	370	mutex_unlock(&register_lock);
1da177e4 LT	371	}
1da177e4 LT	372
13bfe99e TG	373	void unregister_irq_proc(unsigned int irq, struct irq_desc *desc)
	374	{
	375	char name [MAX_NAMELEN];
	376
	377	if (!root_irq_dir \|\| !desc->dir)
	378	return;
	379	#ifdef CONFIG_SMP
	380	remove_proc_entry("smp_affinity", desc->dir);
	381	remove_proc_entry("affinity_hint", desc->dir);
def945ee	382	remove_proc_entry("smp_affinity_list", desc->dir);
13bfe99e TG	383	remove_proc_entry("node", desc->dir);
	384	#endif
	385	remove_proc_entry("spurious", desc->dir);
	386
13bfe99e TG	387	sprintf(name, "%u", irq);
	388	remove_proc_entry(name, root_irq_dir);
	389	}
	390
1da177e4 LT	391	#undef MAX_NAMELEN
	392
	393	void unregister_handler_proc(unsigned int irq, struct irqaction *action)
	394	{
a8ca16ea	395	proc_remove(action->dir);
1da177e4 LT	396	}
1da177e4 LT	397
3786fc71	398	static void register_default_affinity_proc(void)
18404756 MK	399	{
18404756 MK	400	#ifdef CONFIG_SMP
bab5c790	401	proc_create("irq/default_smp_affinity", 0644, NULL,
f18e439d	402	&default_affinity_proc_fops);
18404756 MK	403	#endif
	404	}
	405
1da177e4 LT	406	void init_irq_proc(void)
1da177e4 LT	407	{
2c6927a3 YL	408	unsigned int irq;
2c6927a3 YL	409	struct irq_desc *desc;
1da177e4 LT	410
	411	/* create /proc/irq */
	412	root_irq_dir = proc_mkdir("irq", NULL);
	413	if (!root_irq_dir)
	414	return;
	415
18404756 MK	416	register_default_affinity_proc();
18404756 MK	417
1da177e4 LT	418	/*
	419	* Create entries for all existing IRQs.
	420	*/
fe3464ca	421	for_each_irq_desc(irq, desc)
2c6927a3	422	register_irq_proc(irq, desc);
1da177e4 LT	423	}
1da177e4 LT	424
c78b9b65 TG	425	#ifdef CONFIG_GENERIC_IRQ_SHOW
	426
	427	int __weak arch_show_interrupts(struct seq_file *p, int prec)
	428	{
	429	return 0;
	430	}
	431
a6e120ed TG	432	#ifndef ACTUAL_NR_IRQS
	433	# define ACTUAL_NR_IRQS nr_irqs
	434	#endif
	435
c78b9b65 TG	436	int show_interrupts(struct seq_file p, void v)
	437	{
	438	static int prec;
	439
	440	unsigned long flags, any_count = 0;
	441	int i = (loff_t ) v, j;
	442	struct irqaction *action;
	443	struct irq_desc *desc;
	444
a6e120ed	445	if (i > ACTUAL_NR_IRQS)
c78b9b65 TG	446	return 0;
c78b9b65 TG	447
a6e120ed	448	if (i == ACTUAL_NR_IRQS)
c78b9b65 TG	449	return arch_show_interrupts(p, prec);
	450
	451	/* print header and calculate the width of the first column */
	452	if (i == 0) {
	453	for (prec = 3, j = 1000; prec < 10 && j <= nr_irqs; ++prec)
	454	j *= 10;
	455
	456	seq_printf(p, "%*s", prec + 8, "");
	457	for_each_online_cpu(j)
	458	seq_printf(p, "CPU%-8d", j);
	459	seq_putc(p, '\n');
	460	}
	461
c291ee62	462	irq_lock_sparse();
c78b9b65 TG	463	desc = irq_to_desc(i);
c78b9b65 TG	464	if (!desc)
c291ee62	465	goto outsparse;
c78b9b65 TG	466
	467	raw_spin_lock_irqsave(&desc->lock, flags);
	468	for_each_online_cpu(j)
	469	any_count \|= kstat_irqs_cpu(i, j);
	470	action = desc->action;
4717f133	471	if ((!action \|\| irq_desc_is_chained(desc)) && !any_count)
c78b9b65 TG	472	goto out;
	473
	474	seq_printf(p, "%*d: ", prec, i);
	475	for_each_online_cpu(j)
	476	seq_printf(p, "%10u ", kstat_irqs_cpu(i, j));
ab7798ff TG	477
	478	if (desc->irq_data.chip) {
	479	if (desc->irq_data.chip->irq_print_chip)
	480	desc->irq_data.chip->irq_print_chip(&desc->irq_data, p);
	481	else if (desc->irq_data.chip->name)
	482	seq_printf(p, " %8s", desc->irq_data.chip->name);
	483	else
	484	seq_printf(p, " %8s", "-");
	485	} else {
	486	seq_printf(p, " %8s", "None");
	487	}
c12d2f42 GL	488	if (desc->irq_data.domain)
c12d2f42 GL	489	seq_printf(p, " %*d", prec, (int) desc->irq_data.hwirq);
94b2c363	490	#ifdef CONFIG_GENERIC_IRQ_SHOW_LEVEL
ab7798ff TG	491	seq_printf(p, " %-8s", irqd_is_level_type(&desc->irq_data) ? "Level" : "Edge");
ab7798ff TG	492	#endif
ee0401ec TG	493	if (desc->name)
ee0401ec TG	494	seq_printf(p, "-%-8s", desc->name);
c78b9b65 TG	495
	496	if (action) {
	497	seq_printf(p, " %s", action->name);
	498	while ((action = action->next) != NULL)
	499	seq_printf(p, ", %s", action->name);
	500	}
	501
	502	seq_putc(p, '\n');
	503	out:
	504	raw_spin_unlock_irqrestore(&desc->lock, flags);
c291ee62 TG	505	outsparse:
c291ee62 TG	506	irq_unlock_sparse();
c78b9b65 TG	507	return 0;
	508	}
	509	#endif