[linux-block.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;

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