[mirror_ubuntu-artful-kernel.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

enum {
	AFFINITY,
	AFFINITY_LIST,
	EFFECTIVE,
	EFFECTIVE_LIST,
};

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

	switch (type) {
	case AFFINITY:
	case AFFINITY_LIST:
		mask = desc->irq_common_data.affinity;
#ifdef CONFIG_GENERIC_PENDING_IRQ
		if (irqd_is_setaffinity_pending(&desc->irq_data))
			mask = desc->pending_mask;
#endif
		break;
	case EFFECTIVE:
	case EFFECTIVE_LIST:
#ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK
		mask = desc->irq_common_data.effective_affinity;
		break;
#else
		return -EINVAL;
#endif
	};

	switch (type) {
	case AFFINITY_LIST:
	case EFFECTIVE_LIST:
		seq_printf(m, "%*pbl\n", cpumask_pr_args(mask));
		break;
	case AFFINITY:
	case EFFECTIVE:
		seq_printf(m, "%*pb\n", cpumask_pr_args(mask));
		break;
	}
	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(AFFINITY, m);
}

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


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) ? -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,
};

#ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK
static int irq_effective_aff_proc_show(struct seq_file *m, void *v)
{
	return show_irq_affinity(EFFECTIVE, m);
}

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

static int irq_effective_aff_proc_open(struct inode *inode, struct file *file)
{
	return single_open(file, irq_effective_aff_proc_show, PDE_DATA(inode));
}

static int irq_effective_aff_list_proc_open(struct inode *inode,
					    struct file *file)
{
	return single_open(file, irq_effective_aff_list_proc_show,
			   PDE_DATA(inode));
}

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

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

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);
	void __maybe_unused *irqp = (void *)(unsigned long) irq;
	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, irqp);

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

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

	proc_create_data("node", 0444, desc->dir,
			 &irq_node_proc_fops, irqp);
# ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK
	proc_create_data("effective_affinity", 0444, desc->dir,
			 &irq_effective_aff_proc_fops, irqp);
	proc_create_data("effective_affinity_list", 0444, desc->dir,
			 &irq_effective_aff_list_proc_fops, irqp);
# endif
#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);
# ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK
	remove_proc_entry("effective_affinity", desc->dir);
	remove_proc_entry("effective_affinity_list", desc->dir);
# endif
#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);
	else
		seq_printf(p, " %*s", prec, "");
#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
0d3f5425 TG	40	enum {
	41	AFFINITY,
	42	AFFINITY_LIST,
	43	EFFECTIVE,
	44	EFFECTIVE_LIST,
	45	};
	46
047dc633	47	static int show_irq_affinity(int type, struct seq_file *m)
1da177e4	48	{
08678b08	49	struct irq_desc *desc = irq_to_desc((long)m->private);
0d3f5425	50	const struct cpumask *mask;
42ee2b74	51
0d3f5425 TG	52	switch (type) {
	53	case AFFINITY:
	54	case AFFINITY_LIST:
	55	mask = desc->irq_common_data.affinity;
42ee2b74	56	#ifdef CONFIG_GENERIC_PENDING_IRQ
0d3f5425 TG	57	if (irqd_is_setaffinity_pending(&desc->irq_data))
0d3f5425 TG	58	mask = desc->pending_mask;
42ee2b74	59	#endif
0d3f5425 TG	60	break;
	61	case EFFECTIVE:
	62	case EFFECTIVE_LIST:
	63	#ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK
	64	mask = desc->irq_common_data.effective_affinity;
	65	break;
	66	#else
	67	return -EINVAL;
	68	#endif
	69	};
	70
	71	switch (type) {
	72	case AFFINITY_LIST:
	73	case EFFECTIVE_LIST:
c1d7f03f	74	seq_printf(m, "%*pbl\n", cpumask_pr_args(mask));
0d3f5425 TG	75	break;
	76	case AFFINITY:
	77	case EFFECTIVE:
c1d7f03f	78	seq_printf(m, "%*pb\n", cpumask_pr_args(mask));
0d3f5425 TG	79	break;
0d3f5425 TG	80	}
f18e439d	81	return 0;
1da177e4 LT	82	}
1da177e4 LT	83
e7a297b0 PWJ	84	static int irq_affinity_hint_proc_show(struct seq_file m, void v)
	85	{
	86	struct irq_desc *desc = irq_to_desc((long)m->private);
	87	unsigned long flags;
	88	cpumask_var_t mask;
	89
4308ad80	90	if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
e7a297b0 PWJ	91	return -ENOMEM;
	92
	93	raw_spin_lock_irqsave(&desc->lock, flags);
	94	if (desc->affinity_hint)
	95	cpumask_copy(mask, desc->affinity_hint);
e7a297b0 PWJ	96	raw_spin_unlock_irqrestore(&desc->lock, flags);
e7a297b0 PWJ	97
c1d7f03f	98	seq_printf(m, "%*pb\n", cpumask_pr_args(mask));
e7a297b0 PWJ	99	free_cpumask_var(mask);
	100
	101	return 0;
	102	}
	103
25d61578 JK	104	#ifndef is_affinity_mask_valid
	105	#define is_affinity_mask_valid(val) 1
	106	#endif
	107
1da177e4	108	int no_irq_affinity;
4b060420 MT	109	static int irq_affinity_proc_show(struct seq_file m, void v)
4b060420 MT	110	{
0d3f5425	111	return show_irq_affinity(AFFINITY, m);
4b060420 MT	112	}
	113
	114	static int irq_affinity_list_proc_show(struct seq_file m, void v)
	115	{
0d3f5425	116	return show_irq_affinity(AFFINITY_LIST, m);
4b060420 MT	117	}
	118
	119
	120	static ssize_t write_irq_affinity(int type, struct file *file,
f18e439d	121	const char __user buffer, size_t count, loff_t pos)
1da177e4	122	{
d9dda78b	123	unsigned int irq = (int)(long)PDE_DATA(file_inode(file));
0de26520	124	cpumask_var_t new_value;
f18e439d	125	int err;
1da177e4	126
9c255583	127	if (!irq_can_set_affinity_usr(irq) \|\| no_irq_affinity)
1da177e4 LT	128	return -EIO;
1da177e4 LT	129
0de26520 RR	130	if (!alloc_cpumask_var(&new_value, GFP_KERNEL))
	131	return -ENOMEM;
	132
4b060420 MT	133	if (type)
	134	err = cpumask_parselist_user(buffer, count, new_value);
	135	else
	136	err = cpumask_parse_user(buffer, count, new_value);
1da177e4	137	if (err)
0de26520	138	goto free_cpumask;
1da177e4	139
6bdf197b	140	if (!is_affinity_mask_valid(new_value)) {
0de26520 RR	141	err = -EINVAL;
	142	goto free_cpumask;
	143	}
25d61578	144
1da177e4 LT	145	/*
	146	* Do not allow disabling IRQs completely - it's a too easy
	147	* way to make the system unusable accidentally :-) At least
	148	* one online CPU still has to be targeted.
	149	*/
0de26520	150	if (!cpumask_intersects(new_value, cpu_online_mask)) {
cba4235e TG	151	/*
	152	* Special case for empty set - allow the architecture code
	153	* to set default SMP affinity.
	154	*/
	155	err = irq_select_affinity_usr(irq) ? -EINVAL : count;
0de26520 RR	156	} else {
	157	irq_set_affinity(irq, new_value);
	158	err = count;
	159	}
	160
	161	free_cpumask:
	162	free_cpumask_var(new_value);
	163	return err;
1da177e4 LT	164	}
1da177e4 LT	165
4b060420 MT	166	static ssize_t irq_affinity_proc_write(struct file *file,
	167	const char __user buffer, size_t count, loff_t pos)
	168	{
	169	return write_irq_affinity(0, file, buffer, count, pos);
	170	}
	171
	172	static ssize_t irq_affinity_list_proc_write(struct file *file,
	173	const char __user buffer, size_t count, loff_t pos)
	174	{
	175	return write_irq_affinity(1, file, buffer, count, pos);
	176	}
	177
f18e439d	178	static int irq_affinity_proc_open(struct inode inode, struct file file)
18404756	179	{
d9dda78b	180	return single_open(file, irq_affinity_proc_show, PDE_DATA(inode));
18404756 MK	181	}
18404756 MK	182
4b060420 MT	183	static int irq_affinity_list_proc_open(struct inode inode, struct file file)
4b060420 MT	184	{
d9dda78b	185	return single_open(file, irq_affinity_list_proc_show, PDE_DATA(inode));
4b060420 MT	186	}
4b060420 MT	187
e7a297b0 PWJ	188	static int irq_affinity_hint_proc_open(struct inode inode, struct file file)
e7a297b0 PWJ	189	{
d9dda78b	190	return single_open(file, irq_affinity_hint_proc_show, PDE_DATA(inode));
e7a297b0 PWJ	191	}
e7a297b0 PWJ	192
f18e439d AD	193	static const struct file_operations irq_affinity_proc_fops = {
	194	.open = irq_affinity_proc_open,
	195	.read = seq_read,
	196	.llseek = seq_lseek,
	197	.release = single_release,
	198	.write = irq_affinity_proc_write,
	199	};
	200
e7a297b0 PWJ	201	static const struct file_operations irq_affinity_hint_proc_fops = {
	202	.open = irq_affinity_hint_proc_open,
	203	.read = seq_read,
	204	.llseek = seq_lseek,
	205	.release = single_release,
	206	};
	207
4b060420 MT	208	static const struct file_operations irq_affinity_list_proc_fops = {
	209	.open = irq_affinity_list_proc_open,
	210	.read = seq_read,
	211	.llseek = seq_lseek,
	212	.release = single_release,
	213	.write = irq_affinity_list_proc_write,
	214	};
	215
0d3f5425 TG	216	#ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK
	217	static int irq_effective_aff_proc_show(struct seq_file m, void v)
	218	{
	219	return show_irq_affinity(EFFECTIVE, m);
	220	}
	221
	222	static int irq_effective_aff_list_proc_show(struct seq_file m, void v)
	223	{
	224	return show_irq_affinity(EFFECTIVE_LIST, m);
	225	}
	226
	227	static int irq_effective_aff_proc_open(struct inode inode, struct file file)
	228	{
	229	return single_open(file, irq_effective_aff_proc_show, PDE_DATA(inode));
	230	}
	231
	232	static int irq_effective_aff_list_proc_open(struct inode *inode,
	233	struct file *file)
	234	{
	235	return single_open(file, irq_effective_aff_list_proc_show,
	236	PDE_DATA(inode));
	237	}
	238
	239	static const struct file_operations irq_effective_aff_proc_fops = {
	240	.open = irq_effective_aff_proc_open,
	241	.read = seq_read,
	242	.llseek = seq_lseek,
	243	.release = single_release,
	244	};
	245
	246	static const struct file_operations irq_effective_aff_list_proc_fops = {
	247	.open = irq_effective_aff_list_proc_open,
	248	.read = seq_read,
	249	.llseek = seq_lseek,
	250	.release = single_release,
	251	};
	252	#endif
	253
f18e439d AD	254	static int default_affinity_show(struct seq_file m, void v)
f18e439d AD	255	{
c1d7f03f	256	seq_printf(m, "%*pb\n", cpumask_pr_args(irq_default_affinity));
f18e439d AD	257	return 0;
	258	}
	259
	260	static ssize_t default_affinity_write(struct file *file,
	261	const char __user buffer, size_t count, loff_t ppos)
18404756	262	{
d036e67b	263	cpumask_var_t new_value;
f18e439d	264	int err;
18404756	265
d036e67b RR	266	if (!alloc_cpumask_var(&new_value, GFP_KERNEL))
	267	return -ENOMEM;
	268
	269	err = cpumask_parse_user(buffer, count, new_value);
18404756	270	if (err)
d036e67b	271	goto out;
18404756	272
d036e67b RR	273	if (!is_affinity_mask_valid(new_value)) {
	274	err = -EINVAL;
	275	goto out;
	276	}
18404756 MK	277
	278	/*
	279	* Do not allow disabling IRQs completely - it's a too easy
	280	* way to make the system unusable accidentally :-) At least
	281	* one online CPU still has to be targeted.
	282	*/
d036e67b RR	283	if (!cpumask_intersects(new_value, cpu_online_mask)) {
	284	err = -EINVAL;
	285	goto out;
	286	}
18404756	287
d036e67b RR	288	cpumask_copy(irq_default_affinity, new_value);
d036e67b RR	289	err = count;
18404756	290
d036e67b RR	291	out:
	292	free_cpumask_var(new_value);
	293	return err;
18404756	294	}
f18e439d AD	295
	296	static int default_affinity_open(struct inode inode, struct file file)
	297	{
d9dda78b	298	return single_open(file, default_affinity_show, PDE_DATA(inode));
f18e439d AD	299	}
	300
	301	static const struct file_operations default_affinity_proc_fops = {
	302	.open = default_affinity_open,
	303	.read = seq_read,
	304	.llseek = seq_lseek,
	305	.release = single_release,
	306	.write = default_affinity_write,
	307	};
92d6b71a DS	308
	309	static int irq_node_proc_show(struct seq_file m, void v)
	310	{
	311	struct irq_desc *desc = irq_to_desc((long) m->private);
	312
6783011b	313	seq_printf(m, "%d\n", irq_desc_get_node(desc));
92d6b71a DS	314	return 0;
	315	}
	316
	317	static int irq_node_proc_open(struct inode inode, struct file file)
	318	{
d9dda78b	319	return single_open(file, irq_node_proc_show, PDE_DATA(inode));
92d6b71a DS	320	}
	321
	322	static const struct file_operations irq_node_proc_fops = {
	323	.open = irq_node_proc_open,
	324	.read = seq_read,
	325	.llseek = seq_lseek,
	326	.release = single_release,
	327	};
1da177e4 LT	328	#endif
1da177e4 LT	329
a1afb637	330	static int irq_spurious_proc_show(struct seq_file m, void v)
96d97cf0	331	{
a1afb637 AD	332	struct irq_desc *desc = irq_to_desc((long) m->private);
	333
	334	seq_printf(m, "count %u\n" "unhandled %u\n" "last_unhandled %u ms\n",
	335	desc->irq_count, desc->irqs_unhandled,
	336	jiffies_to_msecs(desc->last_unhandled));
	337	return 0;
	338	}
	339
	340	static int irq_spurious_proc_open(struct inode inode, struct file file)
	341	{
d9dda78b	342	return single_open(file, irq_spurious_proc_show, PDE_DATA(inode));
96d97cf0 AK	343	}
96d97cf0 AK	344
a1afb637 AD	345	static const struct file_operations irq_spurious_proc_fops = {
	346	.open = irq_spurious_proc_open,
	347	.read = seq_read,
	348	.llseek = seq_lseek,
	349	.release = single_release,
	350	};
	351
1da177e4 LT	352	#define MAX_NAMELEN 128
	353
	354	static int name_unique(unsigned int irq, struct irqaction *new_action)
	355	{
08678b08	356	struct irq_desc *desc = irq_to_desc(irq);
1da177e4	357	struct irqaction *action;
d2d9433a DA	358	unsigned long flags;
d2d9433a DA	359	int ret = 1;
1da177e4	360
239007b8	361	raw_spin_lock_irqsave(&desc->lock, flags);
f944b5a7	362	for_each_action_of_desc(desc, action) {
1da177e4	363	if ((action != new_action) && action->name &&
d2d9433a DA	364	!strcmp(new_action->name, action->name)) {
	365	ret = 0;
	366	break;
	367	}
	368	}
239007b8	369	raw_spin_unlock_irqrestore(&desc->lock, flags);
d2d9433a	370	return ret;
1da177e4 LT	371	}
	372
	373	void register_handler_proc(unsigned int irq, struct irqaction *action)
	374	{
	375	char name [MAX_NAMELEN];
08678b08	376	struct irq_desc *desc = irq_to_desc(irq);
1da177e4	377
08678b08	378	if (!desc->dir \|\| action->dir \|\| !action->name \|\|
1da177e4 LT	379	!name_unique(irq, action))
	380	return;
	381
1da177e4 LT	382	snprintf(name, MAX_NAMELEN, "%s", action->name);
	383
	384	/* create /proc/irq/1234/handler/ */
08678b08	385	action->dir = proc_mkdir(name, desc->dir);
1da177e4 LT	386	}
	387
	388	#undef MAX_NAMELEN
	389
	390	#define MAX_NAMELEN 10
	391
2c6927a3	392	void register_irq_proc(unsigned int irq, struct irq_desc *desc)
1da177e4	393	{
95c2b175	394	static DEFINE_MUTEX(register_lock);
c1a80386	395	void __maybe_unused irqp = (void )(unsigned long) irq;
1da177e4 LT	396	char name [MAX_NAMELEN];
1da177e4 LT	397
95c2b175	398	if (!root_irq_dir \|\| (desc->irq_data.chip == &no_irq_chip))
1da177e4 LT	399	return;
1da177e4 LT	400
95c2b175 BH	401	/*
	402	* irq directories are registered only when a handler is
	403	* added, not when the descriptor is created, so multiple
	404	* tasks might try to register at the same time.
	405	*/
	406	mutex_lock(&register_lock);
	407
	408	if (desc->dir)
	409	goto out_unlock;
	410
1da177e4 LT	411	sprintf(name, "%d", irq);
	412
	413	/* create /proc/irq/1234 */
08678b08	414	desc->dir = proc_mkdir(name, root_irq_dir);
c82a43d4	415	if (!desc->dir)
95c2b175	416	goto out_unlock;
1da177e4 LT	417
1da177e4 LT	418	#ifdef CONFIG_SMP
f18e439d	419	/* create /proc/irq/<irq>/smp_affinity */
bab5c790	420	proc_create_data("smp_affinity", 0644, desc->dir,
c1a80386	421	&irq_affinity_proc_fops, irqp);
92d6b71a	422
e7a297b0	423	/* create /proc/irq/<irq>/affinity_hint */
bab5c790	424	proc_create_data("affinity_hint", 0444, desc->dir,
c1a80386	425	&irq_affinity_hint_proc_fops, irqp);
e7a297b0	426
4b060420	427	/* create /proc/irq/<irq>/smp_affinity_list */
bab5c790	428	proc_create_data("smp_affinity_list", 0644, desc->dir,
c1a80386	429	&irq_affinity_list_proc_fops, irqp);
4b060420	430
92d6b71a	431	proc_create_data("node", 0444, desc->dir,
c1a80386	432	&irq_node_proc_fops, irqp);
0d3f5425 TG	433	# ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK
	434	proc_create_data("effective_affinity", 0444, desc->dir,
	435	&irq_effective_aff_proc_fops, irqp);
	436	proc_create_data("effective_affinity_list", 0444, desc->dir,
	437	&irq_effective_aff_list_proc_fops, irqp);
	438	# endif
1da177e4	439	#endif
a1afb637 AD	440	proc_create_data("spurious", 0444, desc->dir,
a1afb637 AD	441	&irq_spurious_proc_fops, (void *)(long)irq);
95c2b175 BH	442
	443	out_unlock:
	444	mutex_unlock(&register_lock);
1da177e4 LT	445	}
1da177e4 LT	446
13bfe99e TG	447	void unregister_irq_proc(unsigned int irq, struct irq_desc *desc)
	448	{
	449	char name [MAX_NAMELEN];
	450
	451	if (!root_irq_dir \|\| !desc->dir)
	452	return;
	453	#ifdef CONFIG_SMP
	454	remove_proc_entry("smp_affinity", desc->dir);
	455	remove_proc_entry("affinity_hint", desc->dir);
def945ee	456	remove_proc_entry("smp_affinity_list", desc->dir);
13bfe99e	457	remove_proc_entry("node", desc->dir);
0d3f5425 TG	458	# ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK
	459	remove_proc_entry("effective_affinity", desc->dir);
	460	remove_proc_entry("effective_affinity_list", desc->dir);
	461	# endif
13bfe99e TG	462	#endif
	463	remove_proc_entry("spurious", desc->dir);
	464
13bfe99e TG	465	sprintf(name, "%u", irq);
	466	remove_proc_entry(name, root_irq_dir);
	467	}
	468
1da177e4 LT	469	#undef MAX_NAMELEN
	470
	471	void unregister_handler_proc(unsigned int irq, struct irqaction *action)
	472	{
a8ca16ea	473	proc_remove(action->dir);
1da177e4 LT	474	}
1da177e4 LT	475
3786fc71	476	static void register_default_affinity_proc(void)
18404756 MK	477	{
18404756 MK	478	#ifdef CONFIG_SMP
bab5c790	479	proc_create("irq/default_smp_affinity", 0644, NULL,
f18e439d	480	&default_affinity_proc_fops);
18404756 MK	481	#endif
	482	}
	483
1da177e4 LT	484	void init_irq_proc(void)
1da177e4 LT	485	{
2c6927a3 YL	486	unsigned int irq;
2c6927a3 YL	487	struct irq_desc *desc;
1da177e4 LT	488
	489	/* create /proc/irq */
	490	root_irq_dir = proc_mkdir("irq", NULL);
	491	if (!root_irq_dir)
	492	return;
	493
18404756 MK	494	register_default_affinity_proc();
18404756 MK	495
1da177e4 LT	496	/*
	497	* Create entries for all existing IRQs.
	498	*/
fe3464ca	499	for_each_irq_desc(irq, desc)
2c6927a3	500	register_irq_proc(irq, desc);
1da177e4 LT	501	}
1da177e4 LT	502
c78b9b65 TG	503	#ifdef CONFIG_GENERIC_IRQ_SHOW
	504
	505	int __weak arch_show_interrupts(struct seq_file *p, int prec)
	506	{
	507	return 0;
	508	}
	509
a6e120ed TG	510	#ifndef ACTUAL_NR_IRQS
	511	# define ACTUAL_NR_IRQS nr_irqs
	512	#endif
	513
c78b9b65 TG	514	int show_interrupts(struct seq_file p, void v)
	515	{
	516	static int prec;
	517
	518	unsigned long flags, any_count = 0;
	519	int i = (loff_t ) v, j;
	520	struct irqaction *action;
	521	struct irq_desc *desc;
	522
a6e120ed	523	if (i > ACTUAL_NR_IRQS)
c78b9b65 TG	524	return 0;
c78b9b65 TG	525
a6e120ed	526	if (i == ACTUAL_NR_IRQS)
c78b9b65 TG	527	return arch_show_interrupts(p, prec);
	528
	529	/* print header and calculate the width of the first column */
	530	if (i == 0) {
	531	for (prec = 3, j = 1000; prec < 10 && j <= nr_irqs; ++prec)
	532	j *= 10;
	533
	534	seq_printf(p, "%*s", prec + 8, "");
	535	for_each_online_cpu(j)
	536	seq_printf(p, "CPU%-8d", j);
	537	seq_putc(p, '\n');
	538	}
	539
c291ee62	540	irq_lock_sparse();
c78b9b65 TG	541	desc = irq_to_desc(i);
c78b9b65 TG	542	if (!desc)
c291ee62	543	goto outsparse;
c78b9b65 TG	544
	545	raw_spin_lock_irqsave(&desc->lock, flags);
	546	for_each_online_cpu(j)
	547	any_count \|= kstat_irqs_cpu(i, j);
	548	action = desc->action;
4717f133	549	if ((!action \|\| irq_desc_is_chained(desc)) && !any_count)
c78b9b65 TG	550	goto out;
	551
	552	seq_printf(p, "%*d: ", prec, i);
	553	for_each_online_cpu(j)
	554	seq_printf(p, "%10u ", kstat_irqs_cpu(i, j));
ab7798ff TG	555
	556	if (desc->irq_data.chip) {
	557	if (desc->irq_data.chip->irq_print_chip)
	558	desc->irq_data.chip->irq_print_chip(&desc->irq_data, p);
	559	else if (desc->irq_data.chip->name)
	560	seq_printf(p, " %8s", desc->irq_data.chip->name);
	561	else
	562	seq_printf(p, " %8s", "-");
	563	} else {
	564	seq_printf(p, " %8s", "None");
	565	}
c12d2f42 GL	566	if (desc->irq_data.domain)
c12d2f42 GL	567	seq_printf(p, " %*d", prec, (int) desc->irq_data.hwirq);
f435da41 HS	568	else
f435da41 HS	569	seq_printf(p, " %*s", prec, "");
94b2c363	570	#ifdef CONFIG_GENERIC_IRQ_SHOW_LEVEL
ab7798ff TG	571	seq_printf(p, " %-8s", irqd_is_level_type(&desc->irq_data) ? "Level" : "Edge");
ab7798ff TG	572	#endif
ee0401ec TG	573	if (desc->name)
ee0401ec TG	574	seq_printf(p, "-%-8s", desc->name);
c78b9b65 TG	575
	576	if (action) {
	577	seq_printf(p, " %s", action->name);
	578	while ((action = action->next) != NULL)
	579	seq_printf(p, ", %s", action->name);
	580	}
	581
	582	seq_putc(p, '\n');
	583	out:
	584	raw_spin_unlock_irqrestore(&desc->lock, flags);
c291ee62 TG	585	outsparse:
c291ee62 TG	586	irq_unlock_sparse();
c78b9b65 TG	587	return 0;
	588	}
	589	#endif