[linux-2.6-block.git] / kernel / irq / proc.c

// SPDX-License-Identifier: GPL-2.0
/*
 * 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 = irq_data_get_effective_affinity_mask(&desc->irq_data);
		break;
#endif
	default:
		return -EINVAL;
	}

	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 {
		err = irq_set_affinity(irq, new_value);
		if (!err)
			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 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_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);
}
#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;
}
#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;
}

#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_single_data("affinity_hint", 0444, desc->dir,
			irq_affinity_hint_proc_show, 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_single_data("node", 0444, desc->dir, irq_node_proc_show,
			irqp);
# ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK
	proc_create_single_data("effective_affinity", 0444, desc->dir,
			irq_effective_aff_proc_show, irqp);
	proc_create_single_data("effective_affinity_list", 0444, desc->dir,
			irq_effective_aff_list_proc_show, irqp);
# endif
#endif
	proc_create_single_data("spurious", 0444, desc->dir,
			irq_spurious_proc_show, (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');
	}

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

	if (desc->kstat_irqs)
		for_each_online_cpu(j)
			any_count |= *per_cpu_ptr(desc->kstat_irqs, j);

	if ((!desc->action || irq_desc_is_chained(desc)) && !any_count)
		goto outsparse;

	seq_printf(p, "%*d: ", prec, i);
	for_each_online_cpu(j)
		seq_printf(p, "%10u ", desc->kstat_irqs ?
					*per_cpu_ptr(desc->kstat_irqs, j) : 0);

	raw_spin_lock_irqsave(&desc->lock, flags);
	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);

	action = desc->action;
	if (action) {
		seq_printf(p, "  %s", action->name);
		while ((action = action->next) != NULL)
			seq_printf(p, ", %s", action->name);
	}

	seq_putc(p, '\n');
	raw_spin_unlock_irqrestore(&desc->lock, flags);
outsparse:
	rcu_read_unlock();
	return 0;
}
#endif
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
1da177e4	2	/*
1da177e4 LT	3	* Copyright (C) 1992, 1998-2004 Linus Torvalds, Ingo Molnar
	4	*
	5	* This file contains the /proc/irq/ handling code.
	6	*/
	7
	8	#include <linux/irq.h>
5a0e3ad6	9	#include <linux/gfp.h>
1da177e4	10	#include <linux/proc_fs.h>
f18e439d	11	#include <linux/seq_file.h>
1da177e4	12	#include <linux/interrupt.h>
c78b9b65	13	#include <linux/kernel_stat.h>
95c2b175	14	#include <linux/mutex.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
0d3f5425 TG	39	enum {
	40	AFFINITY,
	41	AFFINITY_LIST,
	42	EFFECTIVE,
	43	EFFECTIVE_LIST,
	44	};
	45
047dc633	46	static int show_irq_affinity(int type, struct seq_file *m)
1da177e4	47	{
08678b08	48	struct irq_desc *desc = irq_to_desc((long)m->private);
0d3f5425	49	const struct cpumask *mask;
42ee2b74	50
0d3f5425 TG	51	switch (type) {
	52	case AFFINITY:
	53	case AFFINITY_LIST:
	54	mask = desc->irq_common_data.affinity;
42ee2b74	55	#ifdef CONFIG_GENERIC_PENDING_IRQ
0d3f5425 TG	56	if (irqd_is_setaffinity_pending(&desc->irq_data))
0d3f5425 TG	57	mask = desc->pending_mask;
42ee2b74	58	#endif
0d3f5425 TG	59	break;
	60	case EFFECTIVE:
	61	case EFFECTIVE_LIST:
	62	#ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK
6bc6d4ab	63	mask = irq_data_get_effective_affinity_mask(&desc->irq_data);
0d3f5425	64	break;
0d3f5425	65	#endif
b33394ba TG	66	default:
b33394ba TG	67	return -EINVAL;
ce8bdd69	68	}
0d3f5425 TG	69
	70	switch (type) {
	71	case AFFINITY_LIST:
	72	case EFFECTIVE_LIST:
c1d7f03f	73	seq_printf(m, "%*pbl\n", cpumask_pr_args(mask));
0d3f5425 TG	74	break;
	75	case AFFINITY:
	76	case EFFECTIVE:
c1d7f03f	77	seq_printf(m, "%*pb\n", cpumask_pr_args(mask));
0d3f5425 TG	78	break;
0d3f5425 TG	79	}
f18e439d	80	return 0;
1da177e4 LT	81	}
1da177e4 LT	82
e7a297b0 PWJ	83	static int irq_affinity_hint_proc_show(struct seq_file m, void v)
	84	{
	85	struct irq_desc *desc = irq_to_desc((long)m->private);
	86	unsigned long flags;
	87	cpumask_var_t mask;
	88
4308ad80	89	if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
e7a297b0 PWJ	90	return -ENOMEM;
	91
	92	raw_spin_lock_irqsave(&desc->lock, flags);
	93	if (desc->affinity_hint)
	94	cpumask_copy(mask, desc->affinity_hint);
e7a297b0 PWJ	95	raw_spin_unlock_irqrestore(&desc->lock, flags);
e7a297b0 PWJ	96
c1d7f03f	97	seq_printf(m, "%*pb\n", cpumask_pr_args(mask));
e7a297b0 PWJ	98	free_cpumask_var(mask);
	99
	100	return 0;
	101	}
	102
25d61578 JK	103	#ifndef is_affinity_mask_valid
	104	#define is_affinity_mask_valid(val) 1
	105	#endif
	106
1da177e4	107	int no_irq_affinity;
4b060420 MT	108	static int irq_affinity_proc_show(struct seq_file m, void v)
4b060420 MT	109	{
0d3f5425	110	return show_irq_affinity(AFFINITY, m);
4b060420 MT	111	}
	112
	113	static int irq_affinity_list_proc_show(struct seq_file m, void v)
	114	{
0d3f5425	115	return show_irq_affinity(AFFINITY_LIST, m);
4b060420 MT	116	}
	117
	118
	119	static ssize_t write_irq_affinity(int type, struct file *file,
f18e439d	120	const char __user buffer, size_t count, loff_t pos)
1da177e4	121	{
d9dda78b	122	unsigned int irq = (int)(long)PDE_DATA(file_inode(file));
0de26520	123	cpumask_var_t new_value;
f18e439d	124	int err;
1da177e4	125
9c255583	126	if (!irq_can_set_affinity_usr(irq) \|\| no_irq_affinity)
1da177e4 LT	127	return -EIO;
1da177e4 LT	128
0de26520 RR	129	if (!alloc_cpumask_var(&new_value, GFP_KERNEL))
	130	return -ENOMEM;
	131
4b060420 MT	132	if (type)
	133	err = cpumask_parselist_user(buffer, count, new_value);
	134	else
	135	err = cpumask_parse_user(buffer, count, new_value);
1da177e4	136	if (err)
0de26520	137	goto free_cpumask;
1da177e4	138
6bdf197b	139	if (!is_affinity_mask_valid(new_value)) {
0de26520 RR	140	err = -EINVAL;
	141	goto free_cpumask;
	142	}
25d61578	143
1da177e4 LT	144	/*
	145	* Do not allow disabling IRQs completely - it's a too easy
	146	* way to make the system unusable accidentally :-) At least
	147	* one online CPU still has to be targeted.
	148	*/
0de26520	149	if (!cpumask_intersects(new_value, cpu_online_mask)) {
cba4235e TG	150	/*
	151	* Special case for empty set - allow the architecture code
	152	* to set default SMP affinity.
	153	*/
	154	err = irq_select_affinity_usr(irq) ? -EINVAL : count;
0de26520	155	} else {
6714796e WY	156	err = irq_set_affinity(irq, new_value);
	157	if (!err)
	158	err = count;
0de26520 RR	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
f18e439d AD	188	static const struct file_operations irq_affinity_proc_fops = {
	189	.open = irq_affinity_proc_open,
	190	.read = seq_read,
	191	.llseek = seq_lseek,
	192	.release = single_release,
	193	.write = irq_affinity_proc_write,
	194	};
	195
4b060420 MT	196	static const struct file_operations irq_affinity_list_proc_fops = {
	197	.open = irq_affinity_list_proc_open,
	198	.read = seq_read,
	199	.llseek = seq_lseek,
	200	.release = single_release,
	201	.write = irq_affinity_list_proc_write,
	202	};
	203
0d3f5425 TG	204	#ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK
	205	static int irq_effective_aff_proc_show(struct seq_file m, void v)
	206	{
	207	return show_irq_affinity(EFFECTIVE, m);
	208	}
	209
	210	static int irq_effective_aff_list_proc_show(struct seq_file m, void v)
	211	{
	212	return show_irq_affinity(EFFECTIVE_LIST, m);
	213	}
0d3f5425 TG	214	#endif
0d3f5425 TG	215
f18e439d AD	216	static int default_affinity_show(struct seq_file m, void v)
f18e439d AD	217	{
c1d7f03f	218	seq_printf(m, "%*pb\n", cpumask_pr_args(irq_default_affinity));
f18e439d AD	219	return 0;
	220	}
	221
	222	static ssize_t default_affinity_write(struct file *file,
	223	const char __user buffer, size_t count, loff_t ppos)
18404756	224	{
d036e67b	225	cpumask_var_t new_value;
f18e439d	226	int err;
18404756	227
d036e67b RR	228	if (!alloc_cpumask_var(&new_value, GFP_KERNEL))
	229	return -ENOMEM;
	230
	231	err = cpumask_parse_user(buffer, count, new_value);
18404756	232	if (err)
d036e67b	233	goto out;
18404756	234
d036e67b RR	235	if (!is_affinity_mask_valid(new_value)) {
	236	err = -EINVAL;
	237	goto out;
	238	}
18404756 MK	239
	240	/*
	241	* Do not allow disabling IRQs completely - it's a too easy
	242	* way to make the system unusable accidentally :-) At least
	243	* one online CPU still has to be targeted.
	244	*/
d036e67b RR	245	if (!cpumask_intersects(new_value, cpu_online_mask)) {
	246	err = -EINVAL;
	247	goto out;
	248	}
18404756	249
d036e67b RR	250	cpumask_copy(irq_default_affinity, new_value);
d036e67b RR	251	err = count;
18404756	252
d036e67b RR	253	out:
	254	free_cpumask_var(new_value);
	255	return err;
18404756	256	}
f18e439d AD	257
	258	static int default_affinity_open(struct inode inode, struct file file)
	259	{
d9dda78b	260	return single_open(file, default_affinity_show, PDE_DATA(inode));
f18e439d AD	261	}
	262
	263	static const struct file_operations default_affinity_proc_fops = {
	264	.open = default_affinity_open,
	265	.read = seq_read,
	266	.llseek = seq_lseek,
	267	.release = single_release,
	268	.write = default_affinity_write,
	269	};
92d6b71a DS	270
	271	static int irq_node_proc_show(struct seq_file m, void v)
	272	{
	273	struct irq_desc *desc = irq_to_desc((long) m->private);
	274
6783011b	275	seq_printf(m, "%d\n", irq_desc_get_node(desc));
92d6b71a DS	276	return 0;
92d6b71a DS	277	}
1da177e4 LT	278	#endif
1da177e4 LT	279
a1afb637	280	static int irq_spurious_proc_show(struct seq_file m, void v)
96d97cf0	281	{
a1afb637 AD	282	struct irq_desc *desc = irq_to_desc((long) m->private);
	283
	284	seq_printf(m, "count %u\n" "unhandled %u\n" "last_unhandled %u ms\n",
	285	desc->irq_count, desc->irqs_unhandled,
	286	jiffies_to_msecs(desc->last_unhandled));
	287	return 0;
	288	}
	289
1da177e4 LT	290	#define MAX_NAMELEN 128
	291
	292	static int name_unique(unsigned int irq, struct irqaction *new_action)
	293	{
08678b08	294	struct irq_desc *desc = irq_to_desc(irq);
1da177e4	295	struct irqaction *action;
d2d9433a DA	296	unsigned long flags;
d2d9433a DA	297	int ret = 1;
1da177e4	298
239007b8	299	raw_spin_lock_irqsave(&desc->lock, flags);
f944b5a7	300	for_each_action_of_desc(desc, action) {
1da177e4	301	if ((action != new_action) && action->name &&
d2d9433a DA	302	!strcmp(new_action->name, action->name)) {
	303	ret = 0;
	304	break;
	305	}
	306	}
239007b8	307	raw_spin_unlock_irqrestore(&desc->lock, flags);
d2d9433a	308	return ret;
1da177e4 LT	309	}
	310
	311	void register_handler_proc(unsigned int irq, struct irqaction *action)
	312	{
	313	char name [MAX_NAMELEN];
08678b08	314	struct irq_desc *desc = irq_to_desc(irq);
1da177e4	315
08678b08	316	if (!desc->dir \|\| action->dir \|\| !action->name \|\|
1da177e4 LT	317	!name_unique(irq, action))
	318	return;
	319
1da177e4 LT	320	snprintf(name, MAX_NAMELEN, "%s", action->name);
	321
	322	/* create /proc/irq/1234/handler/ */
08678b08	323	action->dir = proc_mkdir(name, desc->dir);
1da177e4 LT	324	}
	325
	326	#undef MAX_NAMELEN
	327
	328	#define MAX_NAMELEN 10
	329
2c6927a3	330	void register_irq_proc(unsigned int irq, struct irq_desc *desc)
1da177e4	331	{
95c2b175	332	static DEFINE_MUTEX(register_lock);
c1a80386	333	void __maybe_unused irqp = (void )(unsigned long) irq;
1da177e4 LT	334	char name [MAX_NAMELEN];
1da177e4 LT	335
95c2b175	336	if (!root_irq_dir \|\| (desc->irq_data.chip == &no_irq_chip))
1da177e4 LT	337	return;
1da177e4 LT	338
95c2b175 BH	339	/*
	340	* irq directories are registered only when a handler is
	341	* added, not when the descriptor is created, so multiple
	342	* tasks might try to register at the same time.
	343	*/
	344	mutex_lock(&register_lock);
	345
	346	if (desc->dir)
	347	goto out_unlock;
	348
1da177e4 LT	349	sprintf(name, "%d", irq);
	350
	351	/* create /proc/irq/1234 */
08678b08	352	desc->dir = proc_mkdir(name, root_irq_dir);
c82a43d4	353	if (!desc->dir)
95c2b175	354	goto out_unlock;
1da177e4 LT	355
1da177e4 LT	356	#ifdef CONFIG_SMP
f18e439d	357	/* create /proc/irq/<irq>/smp_affinity */
bab5c790	358	proc_create_data("smp_affinity", 0644, desc->dir,
c1a80386	359	&irq_affinity_proc_fops, irqp);
92d6b71a	360
e7a297b0	361	/* create /proc/irq/<irq>/affinity_hint */
3f3942ac CH	362	proc_create_single_data("affinity_hint", 0444, desc->dir,
3f3942ac CH	363	irq_affinity_hint_proc_show, irqp);
e7a297b0	364
4b060420	365	/* create /proc/irq/<irq>/smp_affinity_list */
bab5c790	366	proc_create_data("smp_affinity_list", 0644, desc->dir,
c1a80386	367	&irq_affinity_list_proc_fops, irqp);
4b060420	368
3f3942ac CH	369	proc_create_single_data("node", 0444, desc->dir, irq_node_proc_show,
3f3942ac CH	370	irqp);
0d3f5425	371	# ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK
3f3942ac CH	372	proc_create_single_data("effective_affinity", 0444, desc->dir,
	373	irq_effective_aff_proc_show, irqp);
	374	proc_create_single_data("effective_affinity_list", 0444, desc->dir,
	375	irq_effective_aff_list_proc_show, irqp);
0d3f5425	376	# endif
1da177e4	377	#endif
3f3942ac CH	378	proc_create_single_data("spurious", 0444, desc->dir,
3f3942ac CH	379	irq_spurious_proc_show, (void *)(long)irq);
95c2b175 BH	380
	381	out_unlock:
	382	mutex_unlock(&register_lock);
1da177e4 LT	383	}
1da177e4 LT	384
13bfe99e TG	385	void unregister_irq_proc(unsigned int irq, struct irq_desc *desc)
	386	{
	387	char name [MAX_NAMELEN];
	388
	389	if (!root_irq_dir \|\| !desc->dir)
	390	return;
	391	#ifdef CONFIG_SMP
	392	remove_proc_entry("smp_affinity", desc->dir);
	393	remove_proc_entry("affinity_hint", desc->dir);
def945ee	394	remove_proc_entry("smp_affinity_list", desc->dir);
13bfe99e	395	remove_proc_entry("node", desc->dir);
0d3f5425 TG	396	# ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK
	397	remove_proc_entry("effective_affinity", desc->dir);
	398	remove_proc_entry("effective_affinity_list", desc->dir);
	399	# endif
13bfe99e TG	400	#endif
	401	remove_proc_entry("spurious", desc->dir);
	402
13bfe99e TG	403	sprintf(name, "%u", irq);
	404	remove_proc_entry(name, root_irq_dir);
	405	}
	406
1da177e4 LT	407	#undef MAX_NAMELEN
	408
	409	void unregister_handler_proc(unsigned int irq, struct irqaction *action)
	410	{
a8ca16ea	411	proc_remove(action->dir);
1da177e4 LT	412	}
1da177e4 LT	413
3786fc71	414	static void register_default_affinity_proc(void)
18404756 MK	415	{
18404756 MK	416	#ifdef CONFIG_SMP
bab5c790	417	proc_create("irq/default_smp_affinity", 0644, NULL,
f18e439d	418	&default_affinity_proc_fops);
18404756 MK	419	#endif
	420	}
	421
1da177e4 LT	422	void init_irq_proc(void)
1da177e4 LT	423	{
2c6927a3 YL	424	unsigned int irq;
2c6927a3 YL	425	struct irq_desc *desc;
1da177e4 LT	426
	427	/* create /proc/irq */
	428	root_irq_dir = proc_mkdir("irq", NULL);
	429	if (!root_irq_dir)
	430	return;
	431
18404756 MK	432	register_default_affinity_proc();
18404756 MK	433
1da177e4 LT	434	/*
	435	* Create entries for all existing IRQs.
	436	*/
fe3464ca	437	for_each_irq_desc(irq, desc)
2c6927a3	438	register_irq_proc(irq, desc);
1da177e4 LT	439	}
1da177e4 LT	440
c78b9b65 TG	441	#ifdef CONFIG_GENERIC_IRQ_SHOW
	442
	443	int __weak arch_show_interrupts(struct seq_file *p, int prec)
	444	{
	445	return 0;
	446	}
	447
a6e120ed TG	448	#ifndef ACTUAL_NR_IRQS
	449	# define ACTUAL_NR_IRQS nr_irqs
	450	#endif
	451
c78b9b65 TG	452	int show_interrupts(struct seq_file p, void v)
	453	{
	454	static int prec;
	455
	456	unsigned long flags, any_count = 0;
	457	int i = (loff_t ) v, j;
	458	struct irqaction *action;
	459	struct irq_desc *desc;
	460
a6e120ed	461	if (i > ACTUAL_NR_IRQS)
c78b9b65 TG	462	return 0;
c78b9b65 TG	463
a6e120ed	464	if (i == ACTUAL_NR_IRQS)
c78b9b65 TG	465	return arch_show_interrupts(p, prec);
	466
	467	/* print header and calculate the width of the first column */
	468	if (i == 0) {
	469	for (prec = 3, j = 1000; prec < 10 && j <= nr_irqs; ++prec)
	470	j *= 10;
	471
	472	seq_printf(p, "%*s", prec + 8, "");
	473	for_each_online_cpu(j)
	474	seq_printf(p, "CPU%-8d", j);
	475	seq_putc(p, '\n');
	476	}
	477
74bdf781	478	rcu_read_lock();
c78b9b65 TG	479	desc = irq_to_desc(i);
c78b9b65 TG	480	if (!desc)
c291ee62	481	goto outsparse;
c78b9b65	482
74bdf781 ED	483	if (desc->kstat_irqs)
	484	for_each_online_cpu(j)
	485	any_count \|= *per_cpu_ptr(desc->kstat_irqs, j);
	486
	487	if ((!desc->action \|\| irq_desc_is_chained(desc)) && !any_count)
	488	goto outsparse;
c78b9b65 TG	489
	490	seq_printf(p, "%*d: ", prec, i);
	491	for_each_online_cpu(j)
74bdf781 ED	492	seq_printf(p, "%10u ", desc->kstat_irqs ?
74bdf781 ED	493	*per_cpu_ptr(desc->kstat_irqs, j) : 0);
ab7798ff	494
74bdf781	495	raw_spin_lock_irqsave(&desc->lock, flags);
ab7798ff TG	496	if (desc->irq_data.chip) {
	497	if (desc->irq_data.chip->irq_print_chip)
	498	desc->irq_data.chip->irq_print_chip(&desc->irq_data, p);
	499	else if (desc->irq_data.chip->name)
	500	seq_printf(p, " %8s", desc->irq_data.chip->name);
	501	else
	502	seq_printf(p, " %8s", "-");
	503	} else {
	504	seq_printf(p, " %8s", "None");
	505	}
c12d2f42 GL	506	if (desc->irq_data.domain)
c12d2f42 GL	507	seq_printf(p, " %*d", prec, (int) desc->irq_data.hwirq);
f435da41 HS	508	else
f435da41 HS	509	seq_printf(p, " %*s", prec, "");
94b2c363	510	#ifdef CONFIG_GENERIC_IRQ_SHOW_LEVEL
ab7798ff TG	511	seq_printf(p, " %-8s", irqd_is_level_type(&desc->irq_data) ? "Level" : "Edge");
ab7798ff TG	512	#endif
ee0401ec TG	513	if (desc->name)
ee0401ec TG	514	seq_printf(p, "-%-8s", desc->name);
c78b9b65	515
74bdf781	516	action = desc->action;
c78b9b65 TG	517	if (action) {
	518	seq_printf(p, " %s", action->name);
	519	while ((action = action->next) != NULL)
	520	seq_printf(p, ", %s", action->name);
	521	}
	522
	523	seq_putc(p, '\n');
c78b9b65	524	raw_spin_unlock_irqrestore(&desc->lock, flags);
c291ee62	525	outsparse:
74bdf781	526	rcu_read_unlock();
c78b9b65 TG	527	return 0;
	528	}
	529	#endif