[GitHub/mt8127/android_kernel_alcatel_ttab.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"

unsigned long fs_buffer_size = 131072;
unsigned long fs_cpu_buffer_size = 8192;
unsigned long fs_buffer_watershed = 32768; /* FIXME: tune */

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