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

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,
};


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);
	oprofilefs_create_file(sb, root, "timeout_ms", &timeout_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>
1a960b40	12	#include <linux/jiffies.h>
1da177e4 LT	13
	14	#include "event_buffer.h"
	15	#include "oprofile_stats.h"
	16	#include "oprof.h"
	17
	18	unsigned long fs_buffer_size = 131072;
	19	unsigned long fs_cpu_buffer_size = 8192;
	20	unsigned long fs_buffer_watershed = 32768; /* FIXME: tune */
	21
1a960b40 JY	22	static ssize_t timeout_read(struct file file, char __user buf,
	23	size_t count, loff_t *offset)
	24	{
	25	return oprofilefs_ulong_to_user(jiffies_to_msecs(timeout_jiffies),
	26	buf, count, offset);
	27	}
	28
	29
	30	static ssize_t timeout_write(struct file file, char const __user buf,
	31	size_t count, loff_t *offset)
	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_timeout(val);
	44
	45	if (retval)
	46	return retval;
	47	return count;
	48	}
	49
	50	static const struct file_operations timeout_fops = {
	51	.read = timeout_read,
	52	.write = timeout_write,
	53	};
	54
	55
9be80c0f	56	static ssize_t depth_read(struct file * file, char __user * buf, size_t count, loff_t * offset)
1da177e4 LT	57	{
	58	return oprofilefs_ulong_to_user(backtrace_depth, buf, count, offset);
	59	}
	60
	61
9be80c0f	62	static ssize_t depth_write(struct file * file, char const __user * buf, size_t count, loff_t * offset)
1da177e4 LT	63	{
	64	unsigned long val;
	65	int retval;
	66
	67	if (*offset)
	68	return -EINVAL;
	69
	70	retval = oprofilefs_ulong_from_user(&val, buf, count);
	71	if (retval)
	72	return retval;
	73
	74	retval = oprofile_set_backtrace(val);
	75
	76	if (retval)
	77	return retval;
	78	return count;
	79	}
	80
	81
d54b1fdb	82	static const struct file_operations depth_fops = {
1da177e4 LT	83	.read = depth_read,
	84	.write = depth_write
	85	};
	86
	87
	88	static ssize_t pointer_size_read(struct file * file, char __user * buf, size_t count, loff_t * offset)
	89	{
	90	return oprofilefs_ulong_to_user(sizeof(void *), buf, count, offset);
	91	}
	92
	93
d54b1fdb	94	static const struct file_operations pointer_size_fops = {
1da177e4 LT	95	.read = pointer_size_read,
	96	};
	97
	98
	99	static ssize_t cpu_type_read(struct file * file, char __user * buf, size_t count, loff_t * offset)
	100	{
	101	return oprofilefs_str_to_user(oprofile_ops.cpu_type, buf, count, offset);
	102	}
	103
	104
d54b1fdb	105	static const struct file_operations cpu_type_fops = {
1da177e4 LT	106	.read = cpu_type_read,
	107	};
	108
	109
	110	static ssize_t enable_read(struct file * file, char __user * buf, size_t count, loff_t * offset)
	111	{
	112	return oprofilefs_ulong_to_user(oprofile_started, buf, count, offset);
	113	}
	114
	115
	116	static ssize_t enable_write(struct file * file, char const __user * buf, size_t count, loff_t * offset)
	117	{
	118	unsigned long val;
	119	int retval;
	120
	121	if (*offset)
	122	return -EINVAL;
1da177e4 LT	123	retval = oprofilefs_ulong_from_user(&val, buf, count);
	124	if (retval)
	125	return retval;
1a960b40	126
1da177e4 LT	127	if (val)
	128	retval = oprofile_start();
	129	else
	130	oprofile_stop();
	131
	132	if (retval)
	133	return retval;
	134	return count;
	135	}
	136
	137
d54b1fdb	138	static const struct file_operations enable_fops = {
1da177e4 LT	139	.read = enable_read,
	140	.write = enable_write,
	141	};
	142
	143
	144	static ssize_t dump_write(struct file * file, char const __user * buf, size_t count, loff_t * offset)
	145	{
	146	wake_up_buffer_waiter();
	147	return count;
	148	}
	149
	150
d54b1fdb	151	static const struct file_operations dump_fops = {
1da177e4 LT	152	.write = dump_write,
	153	};
	154
	155	void oprofile_create_files(struct super_block * sb, struct dentry * root)
	156	{
	157	oprofilefs_create_file(sb, root, "enable", &enable_fops);
	158	oprofilefs_create_file_perm(sb, root, "dump", &dump_fops, 0666);
	159	oprofilefs_create_file(sb, root, "buffer", &event_buffer_fops);
	160	oprofilefs_create_ulong(sb, root, "buffer_size", &fs_buffer_size);
	161	oprofilefs_create_ulong(sb, root, "buffer_watershed", &fs_buffer_watershed);
	162	oprofilefs_create_ulong(sb, root, "cpu_buffer_size", &fs_cpu_buffer_size);
	163	oprofilefs_create_file(sb, root, "cpu_type", &cpu_type_fops);
	164	oprofilefs_create_file(sb, root, "backtrace_depth", &depth_fops);
	165	oprofilefs_create_file(sb, root, "pointer_size", &pointer_size_fops);
1a960b40	166	oprofilefs_create_file(sb, root, "timeout_ms", &timeout_fops);
1da177e4 LT	167	oprofile_create_stats_files(sb, root);
	168	if (oprofile_ops.create_files)
	169	oprofile_ops.create_files(sb, root);
	170	}