blob: 5d36ffc30dd5cc82e5e8806aea88c4863a2cf219 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/**
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"
Robert Richter6a180372008-10-16 15:01:40 +020016
Robert Richterbd2172f2008-12-16 16:19:54 +010017#define BUFFER_SIZE_DEFAULT 131072
18#define CPU_BUFFER_SIZE_DEFAULT 8192
19#define BUFFER_WATERSHED_DEFAULT 32768 /* FIXME: tune */
Robert Richter37ca5eb2008-12-09 16:56:01 +010020
Robert Richterbd2172f2008-12-16 16:19:54 +010021unsigned long oprofile_buffer_size;
22unsigned long oprofile_cpu_buffer_size;
23unsigned long oprofile_buffer_watershed;
Linus Torvalds1da177e2005-04-16 15:20:36 -070024
Robert Richter25ad2912008-09-05 17:12:36 +020025static ssize_t depth_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -070026{
Robert Richterbd2172f2008-12-16 16:19:54 +010027 return oprofilefs_ulong_to_user(oprofile_backtrace_depth, buf, count,
28 offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -070029}
30
31
Robert Richter25ad2912008-09-05 17:12:36 +020032static ssize_t depth_write(struct file *file, char const __user *buf, size_t count, loff_t *offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -070033{
34 unsigned long val;
35 int retval;
36
37 if (*offset)
38 return -EINVAL;
39
40 retval = oprofilefs_ulong_from_user(&val, buf, count);
41 if (retval)
42 return retval;
43
44 retval = oprofile_set_backtrace(val);
45
46 if (retval)
47 return retval;
48 return count;
49}
50
51
Arjan van de Vend54b1fd2007-02-12 00:55:34 -080052static const struct file_operations depth_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070053 .read = depth_read,
54 .write = depth_write
55};
56
Robert Richter6a180372008-10-16 15:01:40 +020057
Robert Richter25ad2912008-09-05 17:12:36 +020058static ssize_t pointer_size_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -070059{
60 return oprofilefs_ulong_to_user(sizeof(void *), buf, count, offset);
61}
62
63
Arjan van de Vend54b1fd2007-02-12 00:55:34 -080064static const struct file_operations pointer_size_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070065 .read = pointer_size_read,
66};
67
68
Robert Richter25ad2912008-09-05 17:12:36 +020069static ssize_t cpu_type_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -070070{
71 return oprofilefs_str_to_user(oprofile_ops.cpu_type, buf, count, offset);
72}
Robert Richter6a180372008-10-16 15:01:40 +020073
74
Arjan van de Vend54b1fd2007-02-12 00:55:34 -080075static const struct file_operations cpu_type_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070076 .read = cpu_type_read,
77};
Robert Richter6a180372008-10-16 15:01:40 +020078
79
Robert Richter25ad2912008-09-05 17:12:36 +020080static ssize_t enable_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -070081{
82 return oprofilefs_ulong_to_user(oprofile_started, buf, count, offset);
83}
84
85
Robert Richter25ad2912008-09-05 17:12:36 +020086static ssize_t enable_write(struct file *file, char const __user *buf, size_t count, loff_t *offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -070087{
88 unsigned long val;
89 int retval;
90
91 if (*offset)
92 return -EINVAL;
Robert Richter4c168ea2008-09-24 11:08:52 +020093
Linus Torvalds1da177e2005-04-16 15:20:36 -070094 retval = oprofilefs_ulong_from_user(&val, buf, count);
95 if (retval)
96 return retval;
Robert Richter6a180372008-10-16 15:01:40 +020097
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 if (val)
99 retval = oprofile_start();
100 else
101 oprofile_stop();
102
103 if (retval)
104 return retval;
105 return count;
106}
107
Robert Richter6a180372008-10-16 15:01:40 +0200108
Arjan van de Vend54b1fd2007-02-12 00:55:34 -0800109static const struct file_operations enable_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 .read = enable_read,
111 .write = enable_write,
112};
113
114
Robert Richter25ad2912008-09-05 17:12:36 +0200115static ssize_t dump_write(struct file *file, char const __user *buf, size_t count, loff_t *offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116{
117 wake_up_buffer_waiter();
118 return count;
119}
120
121
Arjan van de Vend54b1fd2007-02-12 00:55:34 -0800122static const struct file_operations dump_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 .write = dump_write,
124};
Robert Richter6a180372008-10-16 15:01:40 +0200125
Robert Richter25ad2912008-09-05 17:12:36 +0200126void oprofile_create_files(struct super_block *sb, struct dentry *root)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127{
Robert Richter37ca5eb2008-12-09 16:56:01 +0100128 /* reinitialize default values */
Robert Richterbd2172f2008-12-16 16:19:54 +0100129 oprofile_buffer_size = BUFFER_SIZE_DEFAULT;
130 oprofile_cpu_buffer_size = CPU_BUFFER_SIZE_DEFAULT;
131 oprofile_buffer_watershed = BUFFER_WATERSHED_DEFAULT;
Robert Richter37ca5eb2008-12-09 16:56:01 +0100132
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 oprofilefs_create_file(sb, root, "enable", &enable_fops);
134 oprofilefs_create_file_perm(sb, root, "dump", &dump_fops, 0666);
135 oprofilefs_create_file(sb, root, "buffer", &event_buffer_fops);
Robert Richterbd2172f2008-12-16 16:19:54 +0100136 oprofilefs_create_ulong(sb, root, "buffer_size", &oprofile_buffer_size);
137 oprofilefs_create_ulong(sb, root, "buffer_watershed", &oprofile_buffer_watershed);
138 oprofilefs_create_ulong(sb, root, "cpu_buffer_size", &oprofile_cpu_buffer_size);
Robert Richter6a180372008-10-16 15:01:40 +0200139 oprofilefs_create_file(sb, root, "cpu_type", &cpu_type_fops);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 oprofilefs_create_file(sb, root, "backtrace_depth", &depth_fops);
141 oprofilefs_create_file(sb, root, "pointer_size", &pointer_size_fops);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 oprofile_create_stats_files(sb, root);
143 if (oprofile_ops.create_files)
144 oprofile_ops.create_files(sb, root);
145}