[mirror_ubuntu-bionic-kernel.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 */
#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)
		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;
	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 <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 */
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);
	48	if (retval)
	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,
	62	};
	63
	64	#endif
	65
	66
25ad2913	67	static ssize_t depth_read(struct file file, char __user buf, size_t count, loff_t *offset)
1da177e4	68	{
bd2172f5 RR	69	return oprofilefs_ulong_to_user(oprofile_backtrace_depth, buf, count,
bd2172f5 RR	70	offset);
1da177e4 LT	71	}
	72
	73
25ad2913	74	static ssize_t depth_write(struct file file, char const __user buf, size_t count, loff_t *offset)
1da177e4 LT	75	{
	76	unsigned long val;
	77	int retval;
	78
	79	if (*offset)
	80	return -EINVAL;
	81
	82	retval = oprofilefs_ulong_from_user(&val, buf, count);
	83	if (retval)
	84	return retval;
	85
	86	retval = oprofile_set_backtrace(val);
	87
	88	if (retval)
	89	return retval;
	90	return count;
	91	}
	92
	93
d54b1fdb	94	static const struct file_operations depth_fops = {
1da177e4 LT	95	.read = depth_read,
	96	.write = depth_write
	97	};
	98
6a18037d	99
25ad2913	100	static ssize_t pointer_size_read(struct file file, char __user buf, size_t count, loff_t *offset)
1da177e4 LT	101	{
	102	return oprofilefs_ulong_to_user(sizeof(void *), buf, count, offset);
	103	}
	104
	105
d54b1fdb	106	static const struct file_operations pointer_size_fops = {
1da177e4 LT	107	.read = pointer_size_read,
	108	};
	109
	110
25ad2913	111	static ssize_t cpu_type_read(struct file file, char __user buf, size_t count, loff_t *offset)
1da177e4 LT	112	{
	113	return oprofilefs_str_to_user(oprofile_ops.cpu_type, buf, count, offset);
	114	}
6a18037d RR	115
6a18037d RR	116
d54b1fdb	117	static const struct file_operations cpu_type_fops = {
1da177e4 LT	118	.read = cpu_type_read,
1da177e4 LT	119	};
6a18037d RR	120
6a18037d RR	121
25ad2913	122	static ssize_t enable_read(struct file file, char __user buf, size_t count, loff_t *offset)
1da177e4 LT	123	{
	124	return oprofilefs_ulong_to_user(oprofile_started, buf, count, offset);
	125	}
	126
	127
25ad2913	128	static ssize_t enable_write(struct file file, char const __user buf, size_t count, loff_t *offset)
1da177e4 LT	129	{
	130	unsigned long val;
	131	int retval;
	132
	133	if (*offset)
	134	return -EINVAL;
4c168eaf	135
1da177e4 LT	136	retval = oprofilefs_ulong_from_user(&val, buf, count);
	137	if (retval)
	138	return retval;
6a18037d	139
1da177e4 LT	140	if (val)
	141	retval = oprofile_start();
	142	else
	143	oprofile_stop();
	144
	145	if (retval)
	146	return retval;
	147	return count;
	148	}
	149
6a18037d	150
d54b1fdb	151	static const struct file_operations enable_fops = {
1da177e4 LT	152	.read = enable_read,
	153	.write = enable_write,
	154	};
	155
	156
25ad2913	157	static ssize_t dump_write(struct file file, char const __user buf, size_t count, loff_t *offset)
1da177e4 LT	158	{
	159	wake_up_buffer_waiter();
	160	return count;
	161	}
	162
	163
d54b1fdb	164	static const struct file_operations dump_fops = {
1da177e4 LT	165	.write = dump_write,
1da177e4 LT	166	};
6a18037d	167
25ad2913	168	void oprofile_create_files(struct super_block sb, struct dentry root)
1da177e4	169	{
37ca5eb3	170	/* reinitialize default values */
bd2172f5 RR	171	oprofile_buffer_size = BUFFER_SIZE_DEFAULT;
	172	oprofile_cpu_buffer_size = CPU_BUFFER_SIZE_DEFAULT;
	173	oprofile_buffer_watershed = BUFFER_WATERSHED_DEFAULT;
16422a6e	174	oprofile_time_slice = msecs_to_jiffies(TIME_SLICE_DEFAULT);
37ca5eb3	175
1da177e4 LT	176	oprofilefs_create_file(sb, root, "enable", &enable_fops);
	177	oprofilefs_create_file_perm(sb, root, "dump", &dump_fops, 0666);
	178	oprofilefs_create_file(sb, root, "buffer", &event_buffer_fops);
bd2172f5 RR	179	oprofilefs_create_ulong(sb, root, "buffer_size", &oprofile_buffer_size);
	180	oprofilefs_create_ulong(sb, root, "buffer_watershed", &oprofile_buffer_watershed);
	181	oprofilefs_create_ulong(sb, root, "cpu_buffer_size", &oprofile_cpu_buffer_size);
6a18037d	182	oprofilefs_create_file(sb, root, "cpu_type", &cpu_type_fops);
1da177e4 LT	183	oprofilefs_create_file(sb, root, "backtrace_depth", &depth_fops);
1da177e4 LT	184	oprofilefs_create_file(sb, root, "pointer_size", &pointer_size_fops);
4d4036e0 JY	185	#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
	186	oprofilefs_create_file(sb, root, "time_slice", &timeout_fops);
	187	#endif
1da177e4 LT	188	oprofile_create_stats_files(sb, root);
	189	if (oprofile_ops.create_files)
	190	oprofile_ops.create_files(sb, root);
	191	}