[mirror_ubuntu-bionic-kernel.git] / drivers / oprofile / oprofile_files.c

/**
 * @file oprofile_files.c
 *
 * @remark Copyright 2002 OProfile authors
 * @remark Read the file COPYING
 *
 * @author John Levon <levon@movementarian.org>
 */

#include <linux/fs.h>
#include <linux/oprofile.h>
#include <linux/jiffies.h>

#include "event_buffer.h"
#include "oprofile_stats.h"
#include "oprof.h"

#define BUFFER_SIZE_DEFAULT		131072
#define CPU_BUFFER_SIZE_DEFAULT		8192
#define BUFFER_WATERSHED_DEFAULT	32768	/* FIXME: tune */

unsigned long oprofile_buffer_size;
unsigned long oprofile_cpu_buffer_size;
unsigned long oprofile_buffer_watershed;
unsigned long oprofile_time_slice;

#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX

static ssize_t timeout_read(struct file *file, char __user *buf,
		size_t count, loff_t *offset)
{
	return oprofilefs_ulong_to_user(jiffies_to_msecs(oprofile_time_slice),
					buf, count, offset);
}


static ssize_t timeout_write(struct file *file, char const __user *buf,
		size_t count, loff_t *offset)
{
	unsigned long val;
	int retval;

	if (*offset)
		return -EINVAL;

	retval = oprofilefs_ulong_from_user(&val, buf, count);
	if (retval)
		return retval;

	retval = oprofile_set_timeout(val);

	if (retval)
		return retval;
	return count;
}


static const struct file_operations timeout_fops = {
	.read		= timeout_read,
	.write		= timeout_write,
};

#endif


static ssize_t depth_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
{
	return oprofilefs_ulong_to_user(oprofile_backtrace_depth, buf, count,
					offset);
}


static ssize_t depth_write(struct file *file, char const __user *buf, size_t count, loff_t *offset)
{
	unsigned long val;
	int retval;

	if (*offset)
		return -EINVAL;

	retval = oprofilefs_ulong_from_user(&val, buf, count);
	if (retval)
		return retval;

	retval = oprofile_set_backtrace(val);

	if (retval)
		return retval;
	return count;
}


static const struct file_operations depth_fops = {
	.read		= depth_read,
	.write		= depth_write
};


static ssize_t pointer_size_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
{
	return oprofilefs_ulong_to_user(sizeof(void *), buf, count, offset);
}


static const struct file_operations pointer_size_fops = {
	.read		= pointer_size_read,
};


static ssize_t cpu_type_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
{
	return oprofilefs_str_to_user(oprofile_ops.cpu_type, buf, count, offset);
}


static const struct file_operations cpu_type_fops = {
	.read		= cpu_type_read,
};


static ssize_t enable_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
{
	return oprofilefs_ulong_to_user(oprofile_started, buf, count, offset);
}


static ssize_t enable_write(struct file *file, char const __user *buf, size_t count, loff_t *offset)
{
	unsigned long val;
	int retval;

	if (*offset)
		return -EINVAL;

	retval = oprofilefs_ulong_from_user(&val, buf, count);
	if (retval)
		return retval;

	if (val)
		retval = oprofile_start();
	else
		oprofile_stop();

	if (retval)
		return retval;
	return count;
}


static const struct file_operations enable_fops = {
	.read		= enable_read,
	.write		= enable_write,
};


static ssize_t dump_write(struct file *file, char const __user *buf, size_t count, loff_t *offset)
{
	wake_up_buffer_waiter();
	return count;
}


static const struct file_operations dump_fops = {
	.write		= dump_write,
};

void oprofile_create_files(struct super_block *sb, struct dentry *root)
{
	/* reinitialize default values */
	oprofile_buffer_size =		BUFFER_SIZE_DEFAULT;
	oprofile_cpu_buffer_size =	CPU_BUFFER_SIZE_DEFAULT;
	oprofile_buffer_watershed =	BUFFER_WATERSHED_DEFAULT;

	oprofilefs_create_file(sb, root, "enable", &enable_fops);
	oprofilefs_create_file_perm(sb, root, "dump", &dump_fops, 0666);
	oprofilefs_create_file(sb, root, "buffer", &event_buffer_fops);
	oprofilefs_create_ulong(sb, root, "buffer_size", &oprofile_buffer_size);
	oprofilefs_create_ulong(sb, root, "buffer_watershed", &oprofile_buffer_watershed);
	oprofilefs_create_ulong(sb, root, "cpu_buffer_size", &oprofile_cpu_buffer_size);
	oprofilefs_create_file(sb, root, "cpu_type", &cpu_type_fops);
	oprofilefs_create_file(sb, root, "backtrace_depth", &depth_fops);
	oprofilefs_create_file(sb, root, "pointer_size", &pointer_size_fops);
#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
	oprofilefs_create_file(sb, root, "time_slice", &timeout_fops);
#endif
	oprofile_create_stats_files(sb, root);
	if (oprofile_ops.create_files)
		oprofile_ops.create_files(sb, root);
}
Commit	Line	Data
1da177e4 LT	1	/**
	2	* @file oprofile_files.c
	3	*
	4	* @remark Copyright 2002 OProfile authors
	5	* @remark Read the file COPYING
	6	*
	7	* @author John Levon <levon@movementarian.org>
	8	*/
	9
	10	#include <linux/fs.h>
	11	#include <linux/oprofile.h>
4d4036e0	12	#include <linux/jiffies.h>
1da177e4 LT	13
	14	#include "event_buffer.h"
	15	#include "oprofile_stats.h"
	16	#include "oprof.h"
6a18037d	17
bd2172f5 RR	18	#define BUFFER_SIZE_DEFAULT 131072
	19	#define CPU_BUFFER_SIZE_DEFAULT 8192
	20	#define BUFFER_WATERSHED_DEFAULT 32768 /* FIXME: tune */
37ca5eb3	21
bd2172f5 RR	22	unsigned long oprofile_buffer_size;
	23	unsigned long oprofile_cpu_buffer_size;
	24	unsigned long oprofile_buffer_watershed;
afe1b50f	25	unsigned long oprofile_time_slice;
1da177e4	26
4d4036e0 JY	27	#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
	28
	29	static ssize_t timeout_read(struct file file, char __user buf,
	30	size_t count, loff_t *offset)
	31	{
afe1b50f RR	32	return oprofilefs_ulong_to_user(jiffies_to_msecs(oprofile_time_slice),
afe1b50f RR	33	buf, count, offset);
4d4036e0 JY	34	}
	35
	36
	37	static ssize_t timeout_write(struct file file, char const __user buf,
	38	size_t count, loff_t *offset)
	39	{
	40	unsigned long val;
	41	int retval;
	42
	43	if (*offset)
	44	return -EINVAL;
	45
	46	retval = oprofilefs_ulong_from_user(&val, buf, count);
	47	if (retval)
	48	return retval;
	49
	50	retval = oprofile_set_timeout(val);
	51
	52	if (retval)
	53	return retval;
	54	return count;
	55	}
	56
	57
	58	static const struct file_operations timeout_fops = {
	59	.read = timeout_read,
	60	.write = timeout_write,
	61	};
	62
	63	#endif
	64
	65
25ad2913	66	static ssize_t depth_read(struct file file, char __user buf, size_t count, loff_t *offset)
1da177e4	67	{
bd2172f5 RR	68	return oprofilefs_ulong_to_user(oprofile_backtrace_depth, buf, count,
bd2172f5 RR	69	offset);
1da177e4 LT	70	}
	71
	72
25ad2913	73	static ssize_t depth_write(struct file file, char const __user buf, size_t count, loff_t *offset)
1da177e4 LT	74	{
	75	unsigned long val;
	76	int retval;
	77
	78	if (*offset)
	79	return -EINVAL;
	80
	81	retval = oprofilefs_ulong_from_user(&val, buf, count);
	82	if (retval)
	83	return retval;
	84
	85	retval = oprofile_set_backtrace(val);
	86
	87	if (retval)
	88	return retval;
	89	return count;
	90	}
	91
	92
d54b1fdb	93	static const struct file_operations depth_fops = {
1da177e4 LT	94	.read = depth_read,
	95	.write = depth_write
	96	};
	97
6a18037d	98
25ad2913	99	static ssize_t pointer_size_read(struct file file, char __user buf, size_t count, loff_t *offset)
1da177e4 LT	100	{
	101	return oprofilefs_ulong_to_user(sizeof(void *), buf, count, offset);
	102	}
	103
	104
d54b1fdb	105	static const struct file_operations pointer_size_fops = {
1da177e4 LT	106	.read = pointer_size_read,
	107	};
	108
	109
25ad2913	110	static ssize_t cpu_type_read(struct file file, char __user buf, size_t count, loff_t *offset)
1da177e4 LT	111	{
	112	return oprofilefs_str_to_user(oprofile_ops.cpu_type, buf, count, offset);
	113	}
6a18037d RR	114
6a18037d RR	115
d54b1fdb	116	static const struct file_operations cpu_type_fops = {
1da177e4 LT	117	.read = cpu_type_read,
1da177e4 LT	118	};
6a18037d RR	119
6a18037d RR	120
25ad2913	121	static ssize_t enable_read(struct file file, char __user buf, size_t count, loff_t *offset)
1da177e4 LT	122	{
	123	return oprofilefs_ulong_to_user(oprofile_started, buf, count, offset);
	124	}
	125
	126
25ad2913	127	static ssize_t enable_write(struct file file, char const __user buf, size_t count, loff_t *offset)
1da177e4 LT	128	{
	129	unsigned long val;
	130	int retval;
	131
	132	if (*offset)
	133	return -EINVAL;
4c168eaf	134
1da177e4 LT	135	retval = oprofilefs_ulong_from_user(&val, buf, count);
	136	if (retval)
	137	return retval;
6a18037d	138
1da177e4 LT	139	if (val)
	140	retval = oprofile_start();
	141	else
	142	oprofile_stop();
	143
	144	if (retval)
	145	return retval;
	146	return count;
	147	}
	148
6a18037d	149
d54b1fdb	150	static const struct file_operations enable_fops = {
1da177e4 LT	151	.read = enable_read,
	152	.write = enable_write,
	153	};
	154
	155
25ad2913	156	static ssize_t dump_write(struct file file, char const __user buf, size_t count, loff_t *offset)
1da177e4 LT	157	{
	158	wake_up_buffer_waiter();
	159	return count;
	160	}
	161
	162
d54b1fdb	163	static const struct file_operations dump_fops = {
1da177e4 LT	164	.write = dump_write,
1da177e4 LT	165	};
6a18037d	166
25ad2913	167	void oprofile_create_files(struct super_block sb, struct dentry root)
1da177e4	168	{
37ca5eb3	169	/* reinitialize default values */
bd2172f5 RR	170	oprofile_buffer_size = BUFFER_SIZE_DEFAULT;
	171	oprofile_cpu_buffer_size = CPU_BUFFER_SIZE_DEFAULT;
	172	oprofile_buffer_watershed = BUFFER_WATERSHED_DEFAULT;
37ca5eb3	173
1da177e4 LT	174	oprofilefs_create_file(sb, root, "enable", &enable_fops);
	175	oprofilefs_create_file_perm(sb, root, "dump", &dump_fops, 0666);
	176	oprofilefs_create_file(sb, root, "buffer", &event_buffer_fops);
bd2172f5 RR	177	oprofilefs_create_ulong(sb, root, "buffer_size", &oprofile_buffer_size);
	178	oprofilefs_create_ulong(sb, root, "buffer_watershed", &oprofile_buffer_watershed);
	179	oprofilefs_create_ulong(sb, root, "cpu_buffer_size", &oprofile_cpu_buffer_size);
6a18037d	180	oprofilefs_create_file(sb, root, "cpu_type", &cpu_type_fops);
1da177e4 LT	181	oprofilefs_create_file(sb, root, "backtrace_depth", &depth_fops);
1da177e4 LT	182	oprofilefs_create_file(sb, root, "pointer_size", &pointer_size_fops);
4d4036e0 JY	183	#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
	184	oprofilefs_create_file(sb, root, "time_slice", &timeout_fops);
	185	#endif
1da177e4 LT	186	oprofile_create_stats_files(sb, root);
	187	if (oprofile_ops.create_files)
	188	oprofile_ops.create_files(sb, root);
	189	}