[GitHub/mt8127/android_kernel_alcatel_ttab.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"

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)
{
	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;

	memset(name, 0, MAX_NAMELEN);
	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", 0600, desc->dir,
			 &irq_affinity_proc_fops, (void *)(long)irq);

	/* create /proc/irq/<irq>/affinity_hint */
	proc_create_data("affinity_hint", 0400, desc->dir,
			 &irq_affinity_hint_proc_fops, (void *)(long)irq);

	/* create /proc/irq/<irq>/smp_affinity_list */
	proc_create_data("smp_affinity_list", 0600, 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);

	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", 0600, 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");
	}
#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>
8938c105	15	#include <linux/mutex.h>
1da177e4	16
97a41e26 AB	17	#include "internals.h"
97a41e26 AB	18
4a733ee1	19	static struct proc_dir_entry *root_irq_dir;
1da177e4 LT	20
	21	#ifdef CONFIG_SMP
	22
4b060420	23	static int show_irq_affinity(int type, struct seq_file m, void v)
1da177e4	24	{
08678b08	25	struct irq_desc *desc = irq_to_desc((long)m->private);
6b8ff312	26	const struct cpumask *mask = desc->irq_data.affinity;
42ee2b74 AK	27
42ee2b74 AK	28	#ifdef CONFIG_GENERIC_PENDING_IRQ
f230b6d5	29	if (irqd_is_setaffinity_pending(&desc->irq_data))
7f7ace0c	30	mask = desc->pending_mask;
42ee2b74	31	#endif
4b060420 MT	32	if (type)
	33	seq_cpumask_list(m, mask);
	34	else
	35	seq_cpumask(m, mask);
f18e439d AD	36	seq_putc(m, '\n');
f18e439d AD	37	return 0;
1da177e4 LT	38	}
1da177e4 LT	39
e7a297b0 PWJ	40	static int irq_affinity_hint_proc_show(struct seq_file m, void v)
	41	{
	42	struct irq_desc *desc = irq_to_desc((long)m->private);
	43	unsigned long flags;
	44	cpumask_var_t mask;
	45
4308ad80	46	if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
e7a297b0 PWJ	47	return -ENOMEM;
	48
	49	raw_spin_lock_irqsave(&desc->lock, flags);
	50	if (desc->affinity_hint)
	51	cpumask_copy(mask, desc->affinity_hint);
e7a297b0 PWJ	52	raw_spin_unlock_irqrestore(&desc->lock, flags);
	53
	54	seq_cpumask(m, mask);
	55	seq_putc(m, '\n');
	56	free_cpumask_var(mask);
	57
	58	return 0;
	59	}
	60
25d61578 JK	61	#ifndef is_affinity_mask_valid
	62	#define is_affinity_mask_valid(val) 1
	63	#endif
	64
1da177e4	65	int no_irq_affinity;
4b060420 MT	66	static int irq_affinity_proc_show(struct seq_file m, void v)
	67	{
	68	return show_irq_affinity(0, m, v);
	69	}
	70
	71	static int irq_affinity_list_proc_show(struct seq_file m, void v)
	72	{
	73	return show_irq_affinity(1, m, v);
	74	}
	75
	76
	77	static ssize_t write_irq_affinity(int type, struct file *file,
f18e439d	78	const char __user buffer, size_t count, loff_t pos)
1da177e4	79	{
d9dda78b	80	unsigned int irq = (int)(long)PDE_DATA(file_inode(file));
0de26520	81	cpumask_var_t new_value;
f18e439d	82	int err;
1da177e4	83
bce43032	84	if (!irq_can_set_affinity(irq) \|\| no_irq_affinity)
1da177e4 LT	85	return -EIO;
1da177e4 LT	86
0de26520 RR	87	if (!alloc_cpumask_var(&new_value, GFP_KERNEL))
	88	return -ENOMEM;
	89
4b060420 MT	90	if (type)
	91	err = cpumask_parselist_user(buffer, count, new_value);
	92	else
	93	err = cpumask_parse_user(buffer, count, new_value);
1da177e4	94	if (err)
0de26520	95	goto free_cpumask;
1da177e4	96
6bdf197b	97	if (!is_affinity_mask_valid(new_value)) {
0de26520 RR	98	err = -EINVAL;
	99	goto free_cpumask;
	100	}
25d61578	101
1da177e4 LT	102	/*
	103	* Do not allow disabling IRQs completely - it's a too easy
	104	* way to make the system unusable accidentally :-) At least
	105	* one online CPU still has to be targeted.
	106	*/
0de26520	107	if (!cpumask_intersects(new_value, cpu_online_mask)) {
eee45269 IK	108	/* Special case for empty set - allow the architecture
eee45269 IK	109	code to set default SMP affinity. */
3b8249e7	110	err = irq_select_affinity_usr(irq, new_value) ? -EINVAL : count;
0de26520 RR	111	} else {
	112	irq_set_affinity(irq, new_value);
	113	err = count;
	114	}
	115
	116	free_cpumask:
	117	free_cpumask_var(new_value);
	118	return err;
1da177e4 LT	119	}
1da177e4 LT	120
4b060420 MT	121	static ssize_t irq_affinity_proc_write(struct file *file,
	122	const char __user buffer, size_t count, loff_t pos)
	123	{
	124	return write_irq_affinity(0, file, buffer, count, pos);
	125	}
	126
	127	static ssize_t irq_affinity_list_proc_write(struct file *file,
	128	const char __user buffer, size_t count, loff_t pos)
	129	{
	130	return write_irq_affinity(1, file, buffer, count, pos);
	131	}
	132
f18e439d	133	static int irq_affinity_proc_open(struct inode inode, struct file file)
18404756	134	{
d9dda78b	135	return single_open(file, irq_affinity_proc_show, PDE_DATA(inode));
18404756 MK	136	}
18404756 MK	137
4b060420 MT	138	static int irq_affinity_list_proc_open(struct inode inode, struct file file)
4b060420 MT	139	{
d9dda78b	140	return single_open(file, irq_affinity_list_proc_show, PDE_DATA(inode));
4b060420 MT	141	}
4b060420 MT	142
e7a297b0 PWJ	143	static int irq_affinity_hint_proc_open(struct inode inode, struct file file)
e7a297b0 PWJ	144	{
d9dda78b	145	return single_open(file, irq_affinity_hint_proc_show, PDE_DATA(inode));
e7a297b0 PWJ	146	}
e7a297b0 PWJ	147
f18e439d AD	148	static const struct file_operations irq_affinity_proc_fops = {
	149	.open = irq_affinity_proc_open,
	150	.read = seq_read,
	151	.llseek = seq_lseek,
	152	.release = single_release,
	153	.write = irq_affinity_proc_write,
	154	};
	155
e7a297b0 PWJ	156	static const struct file_operations irq_affinity_hint_proc_fops = {
	157	.open = irq_affinity_hint_proc_open,
	158	.read = seq_read,
	159	.llseek = seq_lseek,
	160	.release = single_release,
	161	};
	162
4b060420 MT	163	static const struct file_operations irq_affinity_list_proc_fops = {
	164	.open = irq_affinity_list_proc_open,
	165	.read = seq_read,
	166	.llseek = seq_lseek,
	167	.release = single_release,
	168	.write = irq_affinity_list_proc_write,
	169	};
	170
f18e439d AD	171	static int default_affinity_show(struct seq_file m, void v)
f18e439d AD	172	{
d036e67b	173	seq_cpumask(m, irq_default_affinity);
f18e439d AD	174	seq_putc(m, '\n');
	175	return 0;
	176	}
	177
	178	static ssize_t default_affinity_write(struct file *file,
	179	const char __user buffer, size_t count, loff_t ppos)
18404756	180	{
d036e67b	181	cpumask_var_t new_value;
f18e439d	182	int err;
18404756	183
d036e67b RR	184	if (!alloc_cpumask_var(&new_value, GFP_KERNEL))
	185	return -ENOMEM;
	186
	187	err = cpumask_parse_user(buffer, count, new_value);
18404756	188	if (err)
d036e67b	189	goto out;
18404756	190
d036e67b RR	191	if (!is_affinity_mask_valid(new_value)) {
	192	err = -EINVAL;
	193	goto out;
	194	}
18404756 MK	195
	196	/*
	197	* Do not allow disabling IRQs completely - it's a too easy
	198	* way to make the system unusable accidentally :-) At least
	199	* one online CPU still has to be targeted.
	200	*/
d036e67b RR	201	if (!cpumask_intersects(new_value, cpu_online_mask)) {
	202	err = -EINVAL;
	203	goto out;
	204	}
18404756	205
d036e67b RR	206	cpumask_copy(irq_default_affinity, new_value);
d036e67b RR	207	err = count;
18404756	208
d036e67b RR	209	out:
	210	free_cpumask_var(new_value);
	211	return err;
18404756	212	}
f18e439d AD	213
	214	static int default_affinity_open(struct inode inode, struct file file)
	215	{
d9dda78b	216	return single_open(file, default_affinity_show, PDE_DATA(inode));
f18e439d AD	217	}
	218
	219	static const struct file_operations default_affinity_proc_fops = {
	220	.open = default_affinity_open,
	221	.read = seq_read,
	222	.llseek = seq_lseek,
	223	.release = single_release,
	224	.write = default_affinity_write,
	225	};
92d6b71a DS	226
	227	static int irq_node_proc_show(struct seq_file m, void v)
	228	{
	229	struct irq_desc *desc = irq_to_desc((long) m->private);
	230
6b8ff312	231	seq_printf(m, "%d\n", desc->irq_data.node);
92d6b71a DS	232	return 0;
	233	}
	234
	235	static int irq_node_proc_open(struct inode inode, struct file file)
	236	{
d9dda78b	237	return single_open(file, irq_node_proc_show, PDE_DATA(inode));
92d6b71a DS	238	}
	239
	240	static const struct file_operations irq_node_proc_fops = {
	241	.open = irq_node_proc_open,
	242	.read = seq_read,
	243	.llseek = seq_lseek,
	244	.release = single_release,
	245	};
1da177e4 LT	246	#endif
1da177e4 LT	247
a1afb637	248	static int irq_spurious_proc_show(struct seq_file m, void v)
96d97cf0	249	{
a1afb637 AD	250	struct irq_desc *desc = irq_to_desc((long) m->private);
	251
	252	seq_printf(m, "count %u\n" "unhandled %u\n" "last_unhandled %u ms\n",
	253	desc->irq_count, desc->irqs_unhandled,
	254	jiffies_to_msecs(desc->last_unhandled));
	255	return 0;
	256	}
	257
	258	static int irq_spurious_proc_open(struct inode inode, struct file file)
	259	{
d9dda78b	260	return single_open(file, irq_spurious_proc_show, PDE_DATA(inode));
96d97cf0 AK	261	}
96d97cf0 AK	262
a1afb637 AD	263	static const struct file_operations irq_spurious_proc_fops = {
	264	.open = irq_spurious_proc_open,
	265	.read = seq_read,
	266	.llseek = seq_lseek,
	267	.release = single_release,
	268	};
	269
1da177e4 LT	270	#define MAX_NAMELEN 128
	271
	272	static int name_unique(unsigned int irq, struct irqaction *new_action)
	273	{
08678b08	274	struct irq_desc *desc = irq_to_desc(irq);
1da177e4	275	struct irqaction *action;
d2d9433a DA	276	unsigned long flags;
d2d9433a DA	277	int ret = 1;
1da177e4	278
239007b8	279	raw_spin_lock_irqsave(&desc->lock, flags);
d2d9433a	280	for (action = desc->action ; action; action = action->next) {
1da177e4	281	if ((action != new_action) && action->name &&
d2d9433a DA	282	!strcmp(new_action->name, action->name)) {
	283	ret = 0;
	284	break;
	285	}
	286	}
239007b8	287	raw_spin_unlock_irqrestore(&desc->lock, flags);
d2d9433a	288	return ret;
1da177e4 LT	289	}
	290
	291	void register_handler_proc(unsigned int irq, struct irqaction *action)
	292	{
	293	char name [MAX_NAMELEN];
08678b08	294	struct irq_desc *desc = irq_to_desc(irq);
1da177e4	295
08678b08	296	if (!desc->dir \|\| action->dir \|\| !action->name \|\|
1da177e4 LT	297	!name_unique(irq, action))
	298	return;
	299
	300	memset(name, 0, MAX_NAMELEN);
	301	snprintf(name, MAX_NAMELEN, "%s", action->name);
	302
	303	/* create /proc/irq/1234/handler/ */
08678b08	304	action->dir = proc_mkdir(name, desc->dir);
1da177e4 LT	305	}
	306
	307	#undef MAX_NAMELEN
	308
	309	#define MAX_NAMELEN 10
	310
2c6927a3	311	void register_irq_proc(unsigned int irq, struct irq_desc *desc)
1da177e4	312	{
8938c105	313	static DEFINE_MUTEX(register_lock);
1da177e4 LT	314	char name [MAX_NAMELEN];
1da177e4 LT	315
8938c105	316	if (!root_irq_dir \|\| (desc->irq_data.chip == &no_irq_chip))
1da177e4 LT	317	return;
1da177e4 LT	318
8938c105 BH	319	/*
	320	* irq directories are registered only when a handler is
	321	* added, not when the descriptor is created, so multiple
	322	* tasks might try to register at the same time.
	323	*/
	324	mutex_lock(&register_lock);
	325
	326	if (desc->dir)
	327	goto out_unlock;
	328
1da177e4 LT	329	memset(name, 0, MAX_NAMELEN);
	330	sprintf(name, "%d", irq);
	331
	332	/* create /proc/irq/1234 */
08678b08	333	desc->dir = proc_mkdir(name, root_irq_dir);
c82a43d4	334	if (!desc->dir)
8938c105	335	goto out_unlock;
1da177e4 LT	336
1da177e4 LT	337	#ifdef CONFIG_SMP
f18e439d	338	/* create /proc/irq/<irq>/smp_affinity */
08678b08	339	proc_create_data("smp_affinity", 0600, desc->dir,
f18e439d	340	&irq_affinity_proc_fops, (void *)(long)irq);
92d6b71a	341
e7a297b0 PWJ	342	/* create /proc/irq/<irq>/affinity_hint */
	343	proc_create_data("affinity_hint", 0400, desc->dir,
	344	&irq_affinity_hint_proc_fops, (void *)(long)irq);
	345
4b060420 MT	346	/* create /proc/irq/<irq>/smp_affinity_list */
	347	proc_create_data("smp_affinity_list", 0600, desc->dir,
	348	&irq_affinity_list_proc_fops, (void *)(long)irq);
	349
92d6b71a DS	350	proc_create_data("node", 0444, desc->dir,
92d6b71a DS	351	&irq_node_proc_fops, (void *)(long)irq);
1da177e4	352	#endif
96d97cf0	353
a1afb637 AD	354	proc_create_data("spurious", 0444, desc->dir,
a1afb637 AD	355	&irq_spurious_proc_fops, (void *)(long)irq);
8938c105 BH	356
	357	out_unlock:
	358	mutex_unlock(&register_lock);
1da177e4 LT	359	}
1da177e4 LT	360
13bfe99e TG	361	void unregister_irq_proc(unsigned int irq, struct irq_desc *desc)
	362	{
	363	char name [MAX_NAMELEN];
	364
	365	if (!root_irq_dir \|\| !desc->dir)
	366	return;
	367	#ifdef CONFIG_SMP
	368	remove_proc_entry("smp_affinity", desc->dir);
	369	remove_proc_entry("affinity_hint", desc->dir);
def945ee	370	remove_proc_entry("smp_affinity_list", desc->dir);
13bfe99e TG	371	remove_proc_entry("node", desc->dir);
	372	#endif
	373	remove_proc_entry("spurious", desc->dir);
	374
	375	memset(name, 0, MAX_NAMELEN);
	376	sprintf(name, "%u", irq);
	377	remove_proc_entry(name, root_irq_dir);
	378	}
	379
1da177e4 LT	380	#undef MAX_NAMELEN
	381
	382	void unregister_handler_proc(unsigned int irq, struct irqaction *action)
	383	{
a8ca16ea	384	proc_remove(action->dir);
1da177e4 LT	385	}
1da177e4 LT	386
3786fc71	387	static void register_default_affinity_proc(void)
18404756 MK	388	{
18404756 MK	389	#ifdef CONFIG_SMP
f18e439d AD	390	proc_create("irq/default_smp_affinity", 0600, NULL,
f18e439d AD	391	&default_affinity_proc_fops);
18404756 MK	392	#endif
	393	}
	394
1da177e4 LT	395	void init_irq_proc(void)
1da177e4 LT	396	{
2c6927a3 YL	397	unsigned int irq;
2c6927a3 YL	398	struct irq_desc *desc;
1da177e4 LT	399
	400	/* create /proc/irq */
	401	root_irq_dir = proc_mkdir("irq", NULL);
	402	if (!root_irq_dir)
	403	return;
	404
18404756 MK	405	register_default_affinity_proc();
18404756 MK	406
1da177e4 LT	407	/*
	408	* Create entries for all existing IRQs.
	409	*/
0b8f1efa YL	410	for_each_irq_desc(irq, desc) {
	411	if (!desc)
	412	continue;
	413
2c6927a3	414	register_irq_proc(irq, desc);
0b8f1efa	415	}
1da177e4 LT	416	}
1da177e4 LT	417
c78b9b65 TG	418	#ifdef CONFIG_GENERIC_IRQ_SHOW
	419
	420	int __weak arch_show_interrupts(struct seq_file *p, int prec)
	421	{
	422	return 0;
	423	}
	424
a6e120ed TG	425	#ifndef ACTUAL_NR_IRQS
	426	# define ACTUAL_NR_IRQS nr_irqs
	427	#endif
	428
c78b9b65 TG	429	int show_interrupts(struct seq_file p, void v)
	430	{
	431	static int prec;
	432
	433	unsigned long flags, any_count = 0;
	434	int i = (loff_t ) v, j;
	435	struct irqaction *action;
	436	struct irq_desc *desc;
	437
a6e120ed	438	if (i > ACTUAL_NR_IRQS)
c78b9b65 TG	439	return 0;
c78b9b65 TG	440
a6e120ed	441	if (i == ACTUAL_NR_IRQS)
c78b9b65 TG	442	return arch_show_interrupts(p, prec);
	443
	444	/* print header and calculate the width of the first column */
	445	if (i == 0) {
	446	for (prec = 3, j = 1000; prec < 10 && j <= nr_irqs; ++prec)
	447	j *= 10;
	448
	449	seq_printf(p, "%*s", prec + 8, "");
	450	for_each_online_cpu(j)
	451	seq_printf(p, "CPU%-8d", j);
	452	seq_putc(p, '\n');
	453	}
	454
	455	desc = irq_to_desc(i);
	456	if (!desc)
	457	return 0;
	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	}
94b2c363	480	#ifdef CONFIG_GENERIC_IRQ_SHOW_LEVEL
ab7798ff TG	481	seq_printf(p, " %-8s", irqd_is_level_type(&desc->irq_data) ? "Level" : "Edge");
ab7798ff TG	482	#endif
ee0401ec TG	483	if (desc->name)
ee0401ec TG	484	seq_printf(p, "-%-8s", desc->name);
c78b9b65 TG	485
	486	if (action) {
	487	seq_printf(p, " %s", action->name);
	488	while ((action = action->next) != NULL)
	489	seq_printf(p, ", %s", action->name);
	490	}
	491
	492	seq_putc(p, '\n');
	493	out:
	494	raw_spin_unlock_irqrestore(&desc->lock, flags);
	495	return 0;
	496	}
	497	#endif