Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6
[linux-2.6.git] / drivers / oprofile / oprofile_files.c
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 #include <linux/jiffies.h>
13
14 #include "event_buffer.h"
15 #include "oprofile_stats.h"
16 #include "oprof.h"
17
18 #define BUFFER_SIZE_DEFAULT             131072
19 #define CPU_BUFFER_SIZE_DEFAULT         8192
20 #define BUFFER_WATERSHED_DEFAULT        32768   /* FIXME: tune */
21 #define TIME_SLICE_DEFAULT              1
22
23 unsigned long oprofile_buffer_size;
24 unsigned long oprofile_cpu_buffer_size;
25 unsigned long oprofile_buffer_watershed;
26 unsigned long oprofile_time_slice;
27
28 #ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
29
30 static ssize_t timeout_read(struct file *file, char __user *buf,
31                 size_t count, loff_t *offset)
32 {
33         return oprofilefs_ulong_to_user(jiffies_to_msecs(oprofile_time_slice),
34                                         buf, count, offset);
35 }
36
37
38 static ssize_t timeout_write(struct file *file, char const __user *buf,
39                 size_t count, loff_t *offset)
40 {
41         unsigned long val;
42         int retval;
43
44         if (*offset)
45                 return -EINVAL;
46
47         retval = oprofilefs_ulong_from_user(&val, buf, count);
48         if (retval)
49                 return retval;
50
51         retval = oprofile_set_timeout(val);
52
53         if (retval)
54                 return retval;
55         return count;
56 }
57
58
59 static const struct file_operations timeout_fops = {
60         .read           = timeout_read,
61         .write          = timeout_write,
62 };
63
64 #endif
65
66
67 static ssize_t depth_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
68 {
69         return oprofilefs_ulong_to_user(oprofile_backtrace_depth, buf, count,
70                                         offset);
71 }
72
73
74 static ssize_t depth_write(struct file *file, char const __user *buf, size_t count, loff_t *offset)
75 {
76         unsigned long val;
77         int retval;
78
79         if (*offset)
80                 return -EINVAL;
81
82         retval = oprofilefs_ulong_from_user(&val, buf, count);
83         if (retval)
84                 return retval;
85
86         retval = oprofile_set_backtrace(val);
87
88         if (retval)
89                 return retval;
90         return count;
91 }
92
93
94 static const struct file_operations depth_fops = {
95         .read           = depth_read,
96         .write          = depth_write
97 };
98
99
100 static ssize_t pointer_size_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
101 {
102         return oprofilefs_ulong_to_user(sizeof(void *), buf, count, offset);
103 }
104
105
106 static const struct file_operations pointer_size_fops = {
107         .read           = pointer_size_read,
108 };
109
110
111 static ssize_t cpu_type_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
112 {
113         return oprofilefs_str_to_user(oprofile_ops.cpu_type, buf, count, offset);
114 }
115
116
117 static const struct file_operations cpu_type_fops = {
118         .read           = cpu_type_read,
119 };
120
121
122 static ssize_t enable_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
123 {
124         return oprofilefs_ulong_to_user(oprofile_started, buf, count, offset);
125 }
126
127
128 static ssize_t enable_write(struct file *file, char const __user *buf, size_t count, loff_t *offset)
129 {
130         unsigned long val;
131         int retval;
132
133         if (*offset)
134                 return -EINVAL;
135
136         retval = oprofilefs_ulong_from_user(&val, buf, count);
137         if (retval)
138                 return retval;
139
140         if (val)
141                 retval = oprofile_start();
142         else
143                 oprofile_stop();
144
145         if (retval)
146                 return retval;
147         return count;
148 }
149
150
151 static const struct file_operations enable_fops = {
152         .read           = enable_read,
153         .write          = enable_write,
154 };
155
156
157 static ssize_t dump_write(struct file *file, char const __user *buf, size_t count, loff_t *offset)
158 {
159         wake_up_buffer_waiter();
160         return count;
161 }
162
163
164 static const struct file_operations dump_fops = {
165         .write          = dump_write,
166 };
167
168 void oprofile_create_files(struct super_block *sb, struct dentry *root)
169 {
170         /* reinitialize default values */
171         oprofile_buffer_size =          BUFFER_SIZE_DEFAULT;
172         oprofile_cpu_buffer_size =      CPU_BUFFER_SIZE_DEFAULT;
173         oprofile_buffer_watershed =     BUFFER_WATERSHED_DEFAULT;
174         oprofile_time_slice =           msecs_to_jiffies(TIME_SLICE_DEFAULT);
175
176         oprofilefs_create_file(sb, root, "enable", &enable_fops);
177         oprofilefs_create_file_perm(sb, root, "dump", &dump_fops, 0666);
178         oprofilefs_create_file(sb, root, "buffer", &event_buffer_fops);
179         oprofilefs_create_ulong(sb, root, "buffer_size", &oprofile_buffer_size);
180         oprofilefs_create_ulong(sb, root, "buffer_watershed", &oprofile_buffer_watershed);
181         oprofilefs_create_ulong(sb, root, "cpu_buffer_size", &oprofile_cpu_buffer_size);
182         oprofilefs_create_file(sb, root, "cpu_type", &cpu_type_fops);
183         oprofilefs_create_file(sb, root, "backtrace_depth", &depth_fops);
184         oprofilefs_create_file(sb, root, "pointer_size", &pointer_size_fops);
185 #ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
186         oprofilefs_create_file(sb, root, "time_slice", &timeout_fops);
187 #endif
188         oprofile_create_stats_files(sb, root);
189         if (oprofile_ops.create_files)
190                 oprofile_ops.create_files(sb, root);
191 }