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 | } |