[deliverable/linux.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 "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;

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);
	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>
	12
	13	#include "event_buffer.h"
	14	#include "oprofile_stats.h"
	15	#include "oprof.h"
6a18037d	16
bd2172f5 RR	17	#define BUFFER_SIZE_DEFAULT 131072
	18	#define CPU_BUFFER_SIZE_DEFAULT 8192
	19	#define BUFFER_WATERSHED_DEFAULT 32768 /* FIXME: tune */
37ca5eb3	20
bd2172f5 RR	21	unsigned long oprofile_buffer_size;
	22	unsigned long oprofile_cpu_buffer_size;
	23	unsigned long oprofile_buffer_watershed;
1da177e4	24
25ad2913	25	static ssize_t depth_read(struct file file, char __user buf, size_t count, loff_t *offset)
1da177e4	26	{
bd2172f5 RR	27	return oprofilefs_ulong_to_user(oprofile_backtrace_depth, buf, count,
bd2172f5 RR	28	offset);
1da177e4 LT	29	}
	30
	31
25ad2913	32	static ssize_t depth_write(struct file file, char const __user buf, size_t count, loff_t *offset)
1da177e4 LT	33	{
	34	unsigned long val;
	35	int retval;
	36
	37	if (*offset)
	38	return -EINVAL;
	39
	40	retval = oprofilefs_ulong_from_user(&val, buf, count);
	41	if (retval)
	42	return retval;
	43
	44	retval = oprofile_set_backtrace(val);
	45
	46	if (retval)
	47	return retval;
	48	return count;
	49	}
	50
	51
d54b1fdb	52	static const struct file_operations depth_fops = {
1da177e4 LT	53	.read = depth_read,
	54	.write = depth_write
	55	};
	56
6a18037d	57
25ad2913	58	static ssize_t pointer_size_read(struct file file, char __user buf, size_t count, loff_t *offset)
1da177e4 LT	59	{
	60	return oprofilefs_ulong_to_user(sizeof(void *), buf, count, offset);
	61	}
	62
	63
d54b1fdb	64	static const struct file_operations pointer_size_fops = {
1da177e4 LT	65	.read = pointer_size_read,
	66	};
	67
	68
25ad2913	69	static ssize_t cpu_type_read(struct file file, char __user buf, size_t count, loff_t *offset)
1da177e4 LT	70	{
	71	return oprofilefs_str_to_user(oprofile_ops.cpu_type, buf, count, offset);
	72	}
6a18037d RR	73
6a18037d RR	74
d54b1fdb	75	static const struct file_operations cpu_type_fops = {
1da177e4 LT	76	.read = cpu_type_read,
1da177e4 LT	77	};
6a18037d RR	78
6a18037d RR	79
25ad2913	80	static ssize_t enable_read(struct file file, char __user buf, size_t count, loff_t *offset)
1da177e4 LT	81	{
	82	return oprofilefs_ulong_to_user(oprofile_started, buf, count, offset);
	83	}
	84
	85
25ad2913	86	static ssize_t enable_write(struct file file, char const __user buf, size_t count, loff_t *offset)
1da177e4 LT	87	{
	88	unsigned long val;
	89	int retval;
	90
	91	if (*offset)
	92	return -EINVAL;
4c168eaf	93
1da177e4 LT	94	retval = oprofilefs_ulong_from_user(&val, buf, count);
	95	if (retval)
	96	return retval;
6a18037d	97
1da177e4 LT	98	if (val)
	99	retval = oprofile_start();
	100	else
	101	oprofile_stop();
	102
	103	if (retval)
	104	return retval;
	105	return count;
	106	}
	107
6a18037d	108
d54b1fdb	109	static const struct file_operations enable_fops = {
1da177e4 LT	110	.read = enable_read,
	111	.write = enable_write,
	112	};
	113
	114
25ad2913	115	static ssize_t dump_write(struct file file, char const __user buf, size_t count, loff_t *offset)
1da177e4 LT	116	{
	117	wake_up_buffer_waiter();
	118	return count;
	119	}
	120
	121
d54b1fdb	122	static const struct file_operations dump_fops = {
1da177e4 LT	123	.write = dump_write,
1da177e4 LT	124	};
6a18037d	125
25ad2913	126	void oprofile_create_files(struct super_block sb, struct dentry root)
1da177e4	127	{
37ca5eb3	128	/* reinitialize default values */
bd2172f5 RR	129	oprofile_buffer_size = BUFFER_SIZE_DEFAULT;
	130	oprofile_cpu_buffer_size = CPU_BUFFER_SIZE_DEFAULT;
	131	oprofile_buffer_watershed = BUFFER_WATERSHED_DEFAULT;
37ca5eb3	132
1da177e4 LT	133	oprofilefs_create_file(sb, root, "enable", &enable_fops);
	134	oprofilefs_create_file_perm(sb, root, "dump", &dump_fops, 0666);
	135	oprofilefs_create_file(sb, root, "buffer", &event_buffer_fops);
bd2172f5 RR	136	oprofilefs_create_ulong(sb, root, "buffer_size", &oprofile_buffer_size);
	137	oprofilefs_create_ulong(sb, root, "buffer_watershed", &oprofile_buffer_watershed);
	138	oprofilefs_create_ulong(sb, root, "cpu_buffer_size", &oprofile_cpu_buffer_size);
6a18037d	139	oprofilefs_create_file(sb, root, "cpu_type", &cpu_type_fops);
1da177e4 LT	140	oprofilefs_create_file(sb, root, "backtrace_depth", &depth_fops);
	141	oprofilefs_create_file(sb, root, "pointer_size", &pointer_size_fops);
	142	oprofile_create_stats_files(sb, root);
	143	if (oprofile_ops.create_files)
	144	oprofile_ops.create_files(sb, root);
	145	}