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"
16
17 #define BUFFER_SIZE_DEFAULT 131072
18 #define CPU_BUFFER_SIZE_DEFAULT 8192
19 #define BUFFER_WATERSHED_DEFAULT 32768 /* FIXME: tune */
20
21 unsigned long oprofile_buffer_size;
22 unsigned long oprofile_cpu_buffer_size;
23 unsigned long oprofile_buffer_watershed;
24
25 static ssize_t depth_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
26 {
27 return oprofilefs_ulong_to_user(oprofile_backtrace_depth, buf, count,
28 offset);
29 }
30
31
32 static ssize_t depth_write(struct file *file, char const __user *buf, size_t count, loff_t *offset)
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
52 static const struct file_operations depth_fops = {
53 .read = depth_read,
54 .write = depth_write
55 };
56
57
58 static ssize_t pointer_size_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
59 {
60 return oprofilefs_ulong_to_user(sizeof(void *), buf, count, offset);
61 }
62
63
64 static const struct file_operations pointer_size_fops = {
65 .read = pointer_size_read,
66 };
67
68
69 static ssize_t cpu_type_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
70 {
71 return oprofilefs_str_to_user(oprofile_ops.cpu_type, buf, count, offset);
72 }
73
74
75 static const struct file_operations cpu_type_fops = {
76 .read = cpu_type_read,
77 };
78
79
80 static ssize_t enable_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
81 {
82 return oprofilefs_ulong_to_user(oprofile_started, buf, count, offset);
83 }
84
85
86 static ssize_t enable_write(struct file *file, char const __user *buf, size_t count, loff_t *offset)
87 {
88 unsigned long val;
89 int retval;
90
91 if (*offset)
92 return -EINVAL;
93
94 retval = oprofilefs_ulong_from_user(&val, buf, count);
95 if (retval)
96 return retval;
97
98 if (val)
99 retval = oprofile_start();
100 else
101 oprofile_stop();
102
103 if (retval)
104 return retval;
105 return count;
106 }
107
108
109 static const struct file_operations enable_fops = {
110 .read = enable_read,
111 .write = enable_write,
112 };
113
114
115 static ssize_t dump_write(struct file *file, char const __user *buf, size_t count, loff_t *offset)
116 {
117 wake_up_buffer_waiter();
118 return count;
119 }
120
121
122 static const struct file_operations dump_fops = {
123 .write = dump_write,
124 };
125
126 void oprofile_create_files(struct super_block *sb, struct dentry *root)
127 {
128 /* reinitialize default values */
129 oprofile_buffer_size = BUFFER_SIZE_DEFAULT;
130 oprofile_cpu_buffer_size = CPU_BUFFER_SIZE_DEFAULT;
131 oprofile_buffer_watershed = BUFFER_WATERSHED_DEFAULT;
132
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);
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);
139 oprofilefs_create_file(sb, root, "cpu_type", &cpu_type_fops);
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 }
146
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