[mirror_ubuntu-jammy-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 "internals.h"

static struct proc_dir_entry *root_irq_dir;

#ifdef CONFIG_SMP

static int irq_affinity_proc_show(struct seq_file *m, void *v)
{
	struct irq_desc *desc = irq_to_desc((long)m->private);
	const struct cpumask *mask = desc->affinity;

#ifdef CONFIG_GENERIC_PENDING_IRQ
	if (desc->status & IRQ_MOVE_PENDING)
		mask = desc->pending_mask;
#endif
	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 (!alloc_cpumask_var(&mask, GFP_KERNEL))
		return -ENOMEM;

	raw_spin_lock_irqsave(&desc->lock, flags);
	if (desc->affinity_hint)
		cpumask_copy(mask, desc->affinity_hint);
	else
		cpumask_setall(mask);
	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 ssize_t irq_affinity_proc_write(struct file *file,
		const char __user *buffer, size_t count, loff_t *pos)
{
	unsigned int irq = (int)(long)PDE(file->f_path.dentry->d_inode)->data;
	cpumask_var_t new_value;
	int err;

	if (!irq_to_desc(irq)->chip->set_affinity || no_irq_affinity ||
	    irq_balancing_disabled(irq))
		return -EIO;

	if (!alloc_cpumask_var(&new_value, GFP_KERNEL))
		return -ENOMEM;

	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 int irq_affinity_proc_open(struct inode *inode, struct file *file)
{
	return single_open(file, irq_affinity_proc_show, PDE(inode)->data);
}

static int irq_affinity_hint_proc_open(struct inode *inode, struct file *file)
{
	return single_open(file, irq_affinity_hint_proc_show, PDE(inode)->data);
}

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 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(inode)->data);
}

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->node);
	return 0;
}

static int irq_node_proc_open(struct inode *inode, struct file *file)
{
	return single_open(file, irq_node_proc_show, PDE(inode)->data);
}

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, NULL);
}

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

#define MAX_NAMELEN 128

static int name_unique(unsigned int irq, struct irqaction *new_action)
{
	struct irq_desc *desc = irq_to_desc(irq);
	struct irqaction *action;
	unsigned long flags;
	int ret = 1;

	raw_spin_lock_irqsave(&desc->lock, flags);
	for (action = desc->action ; action; action = action->next) {
		if ((action != new_action) && action->name &&
				!strcmp(new_action->name, action->name)) {
			ret = 0;
			break;
		}
	}
	raw_spin_unlock_irqrestore(&desc->lock, flags);
	return ret;
}

void register_handler_proc(unsigned int irq, struct irqaction *action)
{
	char name [MAX_NAMELEN];
	struct irq_desc *desc = irq_to_desc(irq);

	if (!desc->dir || action->dir || !action->name ||
					!name_unique(irq, action))
		return;

	memset(name, 0, MAX_NAMELEN);
	snprintf(name, MAX_NAMELEN, "%s", action->name);

	/* create /proc/irq/1234/handler/ */
	action->dir = proc_mkdir(name, desc->dir);
}

#undef MAX_NAMELEN

#define MAX_NAMELEN 10

void register_irq_proc(unsigned int irq, struct irq_desc *desc)
{
	char name [MAX_NAMELEN];

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

	memset(name, 0, MAX_NAMELEN);
	sprintf(name, "%d", irq);

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

#ifdef CONFIG_SMP
	/* create /proc/irq/<irq>/smp_affinity */
	proc_create_data("smp_affinity", 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);

	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);
}

#undef MAX_NAMELEN

void unregister_handler_proc(unsigned int irq, struct irqaction *action)
{
	if (action->dir) {
		struct irq_desc *desc = irq_to_desc(irq);

		remove_proc_entry(action->dir->name, desc->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);
	}
}
Commit	Line	Data
	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>
	10	#include <linux/gfp.h>
	11	#include <linux/proc_fs.h>
	12	#include <linux/seq_file.h>
	13	#include <linux/interrupt.h>
	14
	15	#include "internals.h"
	16
	17	static struct proc_dir_entry *root_irq_dir;
	18
	19	#ifdef CONFIG_SMP
	20
	21	static int irq_affinity_proc_show(struct seq_file m, void v)
	22	{
	23	struct irq_desc *desc = irq_to_desc((long)m->private);
	24	const struct cpumask *mask = desc->affinity;
	25
	26	#ifdef CONFIG_GENERIC_PENDING_IRQ
	27	if (desc->status & IRQ_MOVE_PENDING)
	28	mask = desc->pending_mask;
	29	#endif
	30	seq_cpumask(m, mask);
	31	seq_putc(m, '\n');
	32	return 0;
	33	}
	34
	35	static int irq_affinity_hint_proc_show(struct seq_file m, void v)
	36	{
	37	struct irq_desc *desc = irq_to_desc((long)m->private);
	38	unsigned long flags;
	39	cpumask_var_t mask;
	40
	41	if (!alloc_cpumask_var(&mask, GFP_KERNEL))
	42	return -ENOMEM;
	43
	44	raw_spin_lock_irqsave(&desc->lock, flags);
	45	if (desc->affinity_hint)
	46	cpumask_copy(mask, desc->affinity_hint);
	47	else
	48	cpumask_setall(mask);
	49	raw_spin_unlock_irqrestore(&desc->lock, flags);
	50
	51	seq_cpumask(m, mask);
	52	seq_putc(m, '\n');
	53	free_cpumask_var(mask);
	54
	55	return 0;
	56	}
	57
	58	#ifndef is_affinity_mask_valid
	59	#define is_affinity_mask_valid(val) 1
	60	#endif
	61
	62	int no_irq_affinity;
	63	static ssize_t irq_affinity_proc_write(struct file *file,
	64	const char __user buffer, size_t count, loff_t pos)
	65	{
	66	unsigned int irq = (int)(long)PDE(file->f_path.dentry->d_inode)->data;
	67	cpumask_var_t new_value;
	68	int err;
	69
	70	if (!irq_to_desc(irq)->chip->set_affinity \|\| no_irq_affinity \|\|
	71	irq_balancing_disabled(irq))
	72	return -EIO;
	73
	74	if (!alloc_cpumask_var(&new_value, GFP_KERNEL))
	75	return -ENOMEM;
	76
	77	err = cpumask_parse_user(buffer, count, new_value);
	78	if (err)
	79	goto free_cpumask;
	80
	81	if (!is_affinity_mask_valid(new_value)) {
	82	err = -EINVAL;
	83	goto free_cpumask;
	84	}
	85
	86	/*
	87	* Do not allow disabling IRQs completely - it's a too easy
	88	* way to make the system unusable accidentally :-) At least
	89	* one online CPU still has to be targeted.
	90	*/
	91	if (!cpumask_intersects(new_value, cpu_online_mask)) {
	92	/* Special case for empty set - allow the architecture
	93	code to set default SMP affinity. */
	94	err = irq_select_affinity_usr(irq) ? -EINVAL : count;
	95	} else {
	96	irq_set_affinity(irq, new_value);
	97	err = count;
	98	}
	99
	100	free_cpumask:
	101	free_cpumask_var(new_value);
	102	return err;
	103	}
	104
	105	static int irq_affinity_proc_open(struct inode inode, struct file file)
	106	{
	107	return single_open(file, irq_affinity_proc_show, PDE(inode)->data);
	108	}
	109
	110	static int irq_affinity_hint_proc_open(struct inode inode, struct file file)
	111	{
	112	return single_open(file, irq_affinity_hint_proc_show, PDE(inode)->data);
	113	}
	114
	115	static const struct file_operations irq_affinity_proc_fops = {
	116	.open = irq_affinity_proc_open,
	117	.read = seq_read,
	118	.llseek = seq_lseek,
	119	.release = single_release,
	120	.write = irq_affinity_proc_write,
	121	};
	122
	123	static const struct file_operations irq_affinity_hint_proc_fops = {
	124	.open = irq_affinity_hint_proc_open,
	125	.read = seq_read,
	126	.llseek = seq_lseek,
	127	.release = single_release,
	128	};
	129
	130	static int default_affinity_show(struct seq_file m, void v)
	131	{
	132	seq_cpumask(m, irq_default_affinity);
	133	seq_putc(m, '\n');
	134	return 0;
	135	}
	136
	137	static ssize_t default_affinity_write(struct file *file,
	138	const char __user buffer, size_t count, loff_t ppos)
	139	{
	140	cpumask_var_t new_value;
	141	int err;
	142
	143	if (!alloc_cpumask_var(&new_value, GFP_KERNEL))
	144	return -ENOMEM;
	145
	146	err = cpumask_parse_user(buffer, count, new_value);
	147	if (err)
	148	goto out;
	149
	150	if (!is_affinity_mask_valid(new_value)) {
	151	err = -EINVAL;
	152	goto out;
	153	}
	154
	155	/*
	156	* Do not allow disabling IRQs completely - it's a too easy
	157	* way to make the system unusable accidentally :-) At least
	158	* one online CPU still has to be targeted.
	159	*/
	160	if (!cpumask_intersects(new_value, cpu_online_mask)) {
	161	err = -EINVAL;
	162	goto out;
	163	}
	164
	165	cpumask_copy(irq_default_affinity, new_value);
	166	err = count;
	167
	168	out:
	169	free_cpumask_var(new_value);
	170	return err;
	171	}
	172
	173	static int default_affinity_open(struct inode inode, struct file file)
	174	{
	175	return single_open(file, default_affinity_show, PDE(inode)->data);
	176	}
	177
	178	static const struct file_operations default_affinity_proc_fops = {
	179	.open = default_affinity_open,
	180	.read = seq_read,
	181	.llseek = seq_lseek,
	182	.release = single_release,
	183	.write = default_affinity_write,
	184	};
	185
	186	static int irq_node_proc_show(struct seq_file m, void v)
	187	{
	188	struct irq_desc *desc = irq_to_desc((long) m->private);
	189
	190	seq_printf(m, "%d\n", desc->node);
	191	return 0;
	192	}
	193
	194	static int irq_node_proc_open(struct inode inode, struct file file)
	195	{
	196	return single_open(file, irq_node_proc_show, PDE(inode)->data);
	197	}
	198
	199	static const struct file_operations irq_node_proc_fops = {
	200	.open = irq_node_proc_open,
	201	.read = seq_read,
	202	.llseek = seq_lseek,
	203	.release = single_release,
	204	};
	205	#endif
	206
	207	static int irq_spurious_proc_show(struct seq_file m, void v)
	208	{
	209	struct irq_desc *desc = irq_to_desc((long) m->private);
	210
	211	seq_printf(m, "count %u\n" "unhandled %u\n" "last_unhandled %u ms\n",
	212	desc->irq_count, desc->irqs_unhandled,
	213	jiffies_to_msecs(desc->last_unhandled));
	214	return 0;
	215	}
	216
	217	static int irq_spurious_proc_open(struct inode inode, struct file file)
	218	{
	219	return single_open(file, irq_spurious_proc_show, NULL);
	220	}
	221
	222	static const struct file_operations irq_spurious_proc_fops = {
	223	.open = irq_spurious_proc_open,
	224	.read = seq_read,
	225	.llseek = seq_lseek,
	226	.release = single_release,
	227	};
	228
	229	#define MAX_NAMELEN 128
	230
	231	static int name_unique(unsigned int irq, struct irqaction *new_action)
	232	{
	233	struct irq_desc *desc = irq_to_desc(irq);
	234	struct irqaction *action;
	235	unsigned long flags;
	236	int ret = 1;
	237
	238	raw_spin_lock_irqsave(&desc->lock, flags);
	239	for (action = desc->action ; action; action = action->next) {
	240	if ((action != new_action) && action->name &&
	241	!strcmp(new_action->name, action->name)) {
	242	ret = 0;
	243	break;
	244	}
	245	}
	246	raw_spin_unlock_irqrestore(&desc->lock, flags);
	247	return ret;
	248	}
	249
	250	void register_handler_proc(unsigned int irq, struct irqaction *action)
	251	{
	252	char name [MAX_NAMELEN];
	253	struct irq_desc *desc = irq_to_desc(irq);
	254
	255	if (!desc->dir \|\| action->dir \|\| !action->name \|\|
	256	!name_unique(irq, action))
	257	return;
	258
	259	memset(name, 0, MAX_NAMELEN);
	260	snprintf(name, MAX_NAMELEN, "%s", action->name);
	261
	262	/* create /proc/irq/1234/handler/ */
	263	action->dir = proc_mkdir(name, desc->dir);
	264	}
	265
	266	#undef MAX_NAMELEN
	267
	268	#define MAX_NAMELEN 10
	269
	270	void register_irq_proc(unsigned int irq, struct irq_desc *desc)
	271	{
	272	char name [MAX_NAMELEN];
	273
	274	if (!root_irq_dir \|\| (desc->chip == &no_irq_chip) \|\| desc->dir)
	275	return;
	276
	277	memset(name, 0, MAX_NAMELEN);
	278	sprintf(name, "%d", irq);
	279
	280	/* create /proc/irq/1234 */
	281	desc->dir = proc_mkdir(name, root_irq_dir);
	282	if (!desc->dir)
	283	return;
	284
	285	#ifdef CONFIG_SMP
	286	/* create /proc/irq/<irq>/smp_affinity */
	287	proc_create_data("smp_affinity", 0600, desc->dir,
	288	&irq_affinity_proc_fops, (void *)(long)irq);
	289
	290	/* create /proc/irq/<irq>/affinity_hint */
	291	proc_create_data("affinity_hint", 0400, desc->dir,
	292	&irq_affinity_hint_proc_fops, (void *)(long)irq);
	293
	294	proc_create_data("node", 0444, desc->dir,
	295	&irq_node_proc_fops, (void *)(long)irq);
	296	#endif
	297
	298	proc_create_data("spurious", 0444, desc->dir,
	299	&irq_spurious_proc_fops, (void *)(long)irq);
	300	}
	301
	302	#undef MAX_NAMELEN
	303
	304	void unregister_handler_proc(unsigned int irq, struct irqaction *action)
	305	{
	306	if (action->dir) {
	307	struct irq_desc *desc = irq_to_desc(irq);
	308
	309	remove_proc_entry(action->dir->name, desc->dir);
	310	}
	311	}
	312
	313	static void register_default_affinity_proc(void)
	314	{
	315	#ifdef CONFIG_SMP
	316	proc_create("irq/default_smp_affinity", 0600, NULL,
	317	&default_affinity_proc_fops);
	318	#endif
	319	}
	320
	321	void init_irq_proc(void)
	322	{
	323	unsigned int irq;
	324	struct irq_desc *desc;
	325
	326	/* create /proc/irq */
	327	root_irq_dir = proc_mkdir("irq", NULL);
	328	if (!root_irq_dir)
	329	return;
	330
	331	register_default_affinity_proc();
	332
	333	/*
	334	* Create entries for all existing IRQs.
	335	*/
	336	for_each_irq_desc(irq, desc) {
	337	if (!desc)
	338	continue;
	339
	340	register_irq_proc(irq, desc);
	341	}
	342	}
	343