[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 FS_BUFFER_SIZE_DEFAULT		131072
#define FS_CPU_BUFFER_SIZE_DEFAULT	8192
#define FS_BUFFER_WATERSHED_DEFAULT	32768	/* FIXME: tune */

unsigned long fs_buffer_size;
unsigned long fs_cpu_buffer_size;
unsigned long fs_buffer_watershed;

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