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> | |
12 | ||
13 | #include "event_buffer.h" | |
14 | #include "oprofile_stats.h" | |
15 | #include "oprof.h" | |
6a18037d | 16 | |
bd2172f5 RR |
17 | #define BUFFER_SIZE_DEFAULT 131072 |
18 | #define CPU_BUFFER_SIZE_DEFAULT 8192 | |
19 | #define BUFFER_WATERSHED_DEFAULT 32768 /* FIXME: tune */ | |
37ca5eb3 | 20 | |
bd2172f5 RR |
21 | unsigned long oprofile_buffer_size; |
22 | unsigned long oprofile_cpu_buffer_size; | |
23 | unsigned long oprofile_buffer_watershed; | |
1da177e4 | 24 | |
25ad2913 | 25 | static ssize_t depth_read(struct file *file, char __user *buf, size_t count, loff_t *offset) |
1da177e4 | 26 | { |
bd2172f5 RR |
27 | return oprofilefs_ulong_to_user(oprofile_backtrace_depth, buf, count, |
28 | offset); | |
1da177e4 LT |
29 | } |
30 | ||
31 | ||
25ad2913 | 32 | static ssize_t depth_write(struct file *file, char const __user *buf, size_t count, loff_t *offset) |
1da177e4 LT |
33 | { |
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 | ||
d54b1fdb | 52 | static const struct file_operations depth_fops = { |
1da177e4 LT |
53 | .read = depth_read, |
54 | .write = depth_write | |
55 | }; | |
56 | ||
6a18037d | 57 | |
25ad2913 | 58 | static ssize_t pointer_size_read(struct file *file, char __user *buf, size_t count, loff_t *offset) |
1da177e4 LT |
59 | { |
60 | return oprofilefs_ulong_to_user(sizeof(void *), buf, count, offset); | |
61 | } | |
62 | ||
63 | ||
d54b1fdb | 64 | static const struct file_operations pointer_size_fops = { |
1da177e4 LT |
65 | .read = pointer_size_read, |
66 | }; | |
67 | ||
68 | ||
25ad2913 | 69 | static ssize_t cpu_type_read(struct file *file, char __user *buf, size_t count, loff_t *offset) |
1da177e4 LT |
70 | { |
71 | return oprofilefs_str_to_user(oprofile_ops.cpu_type, buf, count, offset); | |
72 | } | |
6a18037d RR |
73 | |
74 | ||
d54b1fdb | 75 | static const struct file_operations cpu_type_fops = { |
1da177e4 LT |
76 | .read = cpu_type_read, |
77 | }; | |
6a18037d RR |
78 | |
79 | ||
25ad2913 | 80 | static ssize_t enable_read(struct file *file, char __user *buf, size_t count, loff_t *offset) |
1da177e4 LT |
81 | { |
82 | return oprofilefs_ulong_to_user(oprofile_started, buf, count, offset); | |
83 | } | |
84 | ||
85 | ||
25ad2913 | 86 | static ssize_t enable_write(struct file *file, char const __user *buf, size_t count, loff_t *offset) |
1da177e4 LT |
87 | { |
88 | unsigned long val; | |
89 | int retval; | |
90 | ||
91 | if (*offset) | |
92 | return -EINVAL; | |
4c168eaf | 93 | |
1da177e4 LT |
94 | retval = oprofilefs_ulong_from_user(&val, buf, count); |
95 | if (retval) | |
96 | return retval; | |
6a18037d | 97 | |
1da177e4 LT |
98 | if (val) |
99 | retval = oprofile_start(); | |
100 | else | |
101 | oprofile_stop(); | |
102 | ||
103 | if (retval) | |
104 | return retval; | |
105 | return count; | |
106 | } | |
107 | ||
6a18037d | 108 | |
d54b1fdb | 109 | static const struct file_operations enable_fops = { |
1da177e4 LT |
110 | .read = enable_read, |
111 | .write = enable_write, | |
112 | }; | |
113 | ||
114 | ||
25ad2913 | 115 | static ssize_t dump_write(struct file *file, char const __user *buf, size_t count, loff_t *offset) |
1da177e4 LT |
116 | { |
117 | wake_up_buffer_waiter(); | |
118 | return count; | |
119 | } | |
120 | ||
121 | ||
d54b1fdb | 122 | static const struct file_operations dump_fops = { |
1da177e4 LT |
123 | .write = dump_write, |
124 | }; | |
6a18037d | 125 | |
25ad2913 | 126 | void oprofile_create_files(struct super_block *sb, struct dentry *root) |
1da177e4 | 127 | { |
37ca5eb3 | 128 | /* reinitialize default values */ |
bd2172f5 RR |
129 | oprofile_buffer_size = BUFFER_SIZE_DEFAULT; |
130 | oprofile_cpu_buffer_size = CPU_BUFFER_SIZE_DEFAULT; | |
131 | oprofile_buffer_watershed = BUFFER_WATERSHED_DEFAULT; | |
37ca5eb3 | 132 | |
1da177e4 LT |
133 | 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); | |
bd2172f5 RR |
136 | 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); | |
6a18037d | 139 | oprofilefs_create_file(sb, root, "cpu_type", &cpu_type_fops); |
1da177e4 LT |
140 | oprofilefs_create_file(sb, root, "backtrace_depth", &depth_fops); |
141 | oprofilefs_create_file(sb, root, "pointer_size", &pointer_size_fops); | |
142 | oprofile_create_stats_files(sb, root); | |
143 | if (oprofile_ops.create_files) | |
144 | oprofile_ops.create_files(sb, root); | |
145 | } |