[linux.git] / drivers / oprofile / oprofile_files.c

/**
 * @file oprofile_files.c
 *
 * @remark Copyright 2002 OProfile authors
 * @remark Read the file COPYING
 *
 * @author John Levon <[email protected]>
 */

#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 */
#define TIME_SLICE_DEFAULT		1

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 <= 0)
		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,
	.llseek		= default_llseek,
};

#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;

	if (!oprofile_ops.backtrace)
		return -EINVAL;

	retval = oprofilefs_ulong_from_user(&val, buf, count);
	if (retval <= 0)
		return retval;

	retval = oprofile_set_ulong(&oprofile_backtrace_depth, val);
	if (retval)
		return retval;

	return count;
}


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


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,
	.llseek		= default_llseek,
};


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,
	.llseek		= default_llseek,
};


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 <= 0)
		return retval;

	retval = 0;
	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,
	.llseek		= default_llseek,
};


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,
	.llseek		= noop_llseek,
};

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;
	oprofile_time_slice =		msecs_to_jiffies(TIME_SLICE_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 <[email protected]>
	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 */
16422a6e	21	#define TIME_SLICE_DEFAULT 1
37ca5eb3	22
bd2172f5 RR	23	unsigned long oprofile_buffer_size;
	24	unsigned long oprofile_cpu_buffer_size;
	25	unsigned long oprofile_buffer_watershed;
afe1b50f	26	unsigned long oprofile_time_slice;
1da177e4	27
4d4036e0 JY	28	#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
	29
	30	static ssize_t timeout_read(struct file file, char __user buf,
	31	size_t count, loff_t *offset)
	32	{
afe1b50f RR	33	return oprofilefs_ulong_to_user(jiffies_to_msecs(oprofile_time_slice),
afe1b50f RR	34	buf, count, offset);
4d4036e0 JY	35	}
	36
	37
	38	static ssize_t timeout_write(struct file file, char const __user buf,
	39	size_t count, loff_t *offset)
	40	{
	41	unsigned long val;
	42	int retval;
	43
	44	if (*offset)
	45	return -EINVAL;
	46
	47	retval = oprofilefs_ulong_from_user(&val, buf, count);
913050b9	48	if (retval <= 0)
4d4036e0 JY	49	return retval;
	50
	51	retval = oprofile_set_timeout(val);
	52
	53	if (retval)
	54	return retval;
	55	return count;
	56	}
	57
	58
	59	static const struct file_operations timeout_fops = {
	60	.read = timeout_read,
	61	.write = timeout_write,
6038f373	62	.llseek = default_llseek,
4d4036e0 JY	63	};
	64
	65	#endif
	66
	67
25ad2913	68	static ssize_t depth_read(struct file file, char __user buf, size_t count, loff_t *offset)
1da177e4	69	{
bd2172f5 RR	70	return oprofilefs_ulong_to_user(oprofile_backtrace_depth, buf, count,
bd2172f5 RR	71	offset);
1da177e4 LT	72	}
	73
	74
25ad2913	75	static ssize_t depth_write(struct file file, char const __user buf, size_t count, loff_t *offset)
1da177e4 LT	76	{
	77	unsigned long val;
	78	int retval;
	79
	80	if (*offset)
	81	return -EINVAL;
	82
7df01d96 RR	83	if (!oprofile_ops.backtrace)
	84	return -EINVAL;
	85
1da177e4	86	retval = oprofilefs_ulong_from_user(&val, buf, count);
913050b9	87	if (retval <= 0)
1da177e4 LT	88	return retval;
1da177e4 LT	89
7df01d96	90	retval = oprofile_set_ulong(&oprofile_backtrace_depth, val);
1da177e4 LT	91	if (retval)
1da177e4 LT	92	return retval;
7df01d96	93
1da177e4 LT	94	return count;
	95	}
	96
	97
d54b1fdb	98	static const struct file_operations depth_fops = {
1da177e4	99	.read = depth_read,
6038f373 AB	100	.write = depth_write,
6038f373 AB	101	.llseek = default_llseek,
1da177e4 LT	102	};
1da177e4 LT	103
6a18037d	104
25ad2913	105	static ssize_t pointer_size_read(struct file file, char __user buf, size_t count, loff_t *offset)
1da177e4 LT	106	{
	107	return oprofilefs_ulong_to_user(sizeof(void *), buf, count, offset);
	108	}
	109
	110
d54b1fdb	111	static const struct file_operations pointer_size_fops = {
1da177e4	112	.read = pointer_size_read,
6038f373	113	.llseek = default_llseek,
1da177e4 LT	114	};
	115
	116
25ad2913	117	static ssize_t cpu_type_read(struct file file, char __user buf, size_t count, loff_t *offset)
1da177e4 LT	118	{
	119	return oprofilefs_str_to_user(oprofile_ops.cpu_type, buf, count, offset);
	120	}
6a18037d RR	121
6a18037d RR	122
d54b1fdb	123	static const struct file_operations cpu_type_fops = {
1da177e4	124	.read = cpu_type_read,
6038f373	125	.llseek = default_llseek,
1da177e4	126	};
6a18037d RR	127
6a18037d RR	128
25ad2913	129	static ssize_t enable_read(struct file file, char __user buf, size_t count, loff_t *offset)
1da177e4 LT	130	{
	131	return oprofilefs_ulong_to_user(oprofile_started, buf, count, offset);
	132	}
	133
	134
25ad2913	135	static ssize_t enable_write(struct file file, char const __user buf, size_t count, loff_t *offset)
1da177e4 LT	136	{
	137	unsigned long val;
	138	int retval;
	139
	140	if (*offset)
	141	return -EINVAL;
4c168eaf	142
1da177e4	143	retval = oprofilefs_ulong_from_user(&val, buf, count);
913050b9	144	if (retval <= 0)
1da177e4	145	return retval;
6a18037d	146
913050b9	147	retval = 0;
1da177e4 LT	148	if (val)
	149	retval = oprofile_start();
	150	else
	151	oprofile_stop();
	152
	153	if (retval)
	154	return retval;
	155	return count;
	156	}
	157
6a18037d	158
d54b1fdb	159	static const struct file_operations enable_fops = {
1da177e4 LT	160	.read = enable_read,
1da177e4 LT	161	.write = enable_write,
6038f373	162	.llseek = default_llseek,
1da177e4 LT	163	};
	164
	165
25ad2913	166	static ssize_t dump_write(struct file file, char const __user buf, size_t count, loff_t *offset)
1da177e4 LT	167	{
	168	wake_up_buffer_waiter();
	169	return count;
	170	}
	171
	172
d54b1fdb	173	static const struct file_operations dump_fops = {
1da177e4	174	.write = dump_write,
6038f373	175	.llseek = noop_llseek,
1da177e4	176	};
6a18037d	177
25ad2913	178	void oprofile_create_files(struct super_block sb, struct dentry root)
1da177e4	179	{
37ca5eb3	180	/* reinitialize default values */
bd2172f5 RR	181	oprofile_buffer_size = BUFFER_SIZE_DEFAULT;
	182	oprofile_cpu_buffer_size = CPU_BUFFER_SIZE_DEFAULT;
	183	oprofile_buffer_watershed = BUFFER_WATERSHED_DEFAULT;
16422a6e	184	oprofile_time_slice = msecs_to_jiffies(TIME_SLICE_DEFAULT);
37ca5eb3	185
1da177e4 LT	186	oprofilefs_create_file(sb, root, "enable", &enable_fops);
	187	oprofilefs_create_file_perm(sb, root, "dump", &dump_fops, 0666);
	188	oprofilefs_create_file(sb, root, "buffer", &event_buffer_fops);
bd2172f5 RR	189	oprofilefs_create_ulong(sb, root, "buffer_size", &oprofile_buffer_size);
	190	oprofilefs_create_ulong(sb, root, "buffer_watershed", &oprofile_buffer_watershed);
	191	oprofilefs_create_ulong(sb, root, "cpu_buffer_size", &oprofile_cpu_buffer_size);
6a18037d	192	oprofilefs_create_file(sb, root, "cpu_type", &cpu_type_fops);
1da177e4 LT	193	oprofilefs_create_file(sb, root, "backtrace_depth", &depth_fops);
1da177e4 LT	194	oprofilefs_create_file(sb, root, "pointer_size", &pointer_size_fops);
4d4036e0 JY	195	#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
	196	oprofilefs_create_file(sb, root, "time_slice", &timeout_fops);
	197	#endif
1da177e4 LT	198	oprofile_create_stats_files(sb, root);
	199	if (oprofile_ops.create_files)
	200	oprofile_ops.create_files(sb, root);
	201	}