projects / linux.git / blame
| 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 <[email protected]> | |
| 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 | unsigned long fs_buffer_size = 131072; | |
| 18 | unsigned long fs_cpu_buffer_size = 8192; | |
| 19 | unsigned long fs_buffer_watershed = 32768; /* FIXME: tune */ | |
| 20 | ||
| 9be80c0f | 21 | static ssize_t depth_read(struct file * file, char __user * buf, size_t count, loff_t * offset) |
| 1da177e4 LT |
22 | { |
| 23 | return oprofilefs_ulong_to_user(backtrace_depth, buf, count, offset); | |
| 24 | } | |
| 25 | ||
| 26 | ||
| 9be80c0f | 27 | static ssize_t depth_write(struct file * file, char const __user * buf, size_t count, loff_t * offset) |
| 1da177e4 LT |
28 | { |
| 29 | unsigned long val; | |
| 30 | int retval; | |
| 31 | ||
| 32 | if (*offset) | |
| 33 | return -EINVAL; | |
| 34 | ||
| 35 | retval = oprofilefs_ulong_from_user(&val, buf, count); | |
| 36 | if (retval) | |
| 37 | return retval; | |
| 38 | ||
| 39 | retval = oprofile_set_backtrace(val); | |
| 40 | ||
| 41 | if (retval) | |
| 42 | return retval; | |
| 43 | return count; | |
| 44 | } | |
| 45 | ||
| 46 | ||
| 47 | static struct file_operations depth_fops = { | |
| 48 | .read = depth_read, | |
| 49 | .write = depth_write | |
| 50 | }; | |
| 51 | ||
| 52 | ||
| 53 | static ssize_t pointer_size_read(struct file * file, char __user * buf, size_t count, loff_t * offset) | |
| 54 | { | |
| 55 | return oprofilefs_ulong_to_user(sizeof(void *), buf, count, offset); | |
| 56 | } | |
| 57 | ||
| 58 | ||
| 59 | static struct file_operations pointer_size_fops = { | |
| 60 | .read = pointer_size_read, | |
| 61 | }; | |
| 62 | ||
| 63 | ||
| 64 | static ssize_t cpu_type_read(struct file * file, char __user * buf, size_t count, loff_t * offset) | |
| 65 | { | |
| 66 | return oprofilefs_str_to_user(oprofile_ops.cpu_type, buf, count, offset); | |
| 67 | } | |
| 68 | ||
| 69 | ||
| 70 | static struct file_operations cpu_type_fops = { | |
| 71 | .read = cpu_type_read, | |
| 72 | }; | |
| 73 | ||
| 74 | ||
| 75 | static ssize_t enable_read(struct file * file, char __user * buf, size_t count, loff_t * offset) | |
| 76 | { | |
| 77 | return oprofilefs_ulong_to_user(oprofile_started, buf, count, offset); | |
| 78 | } | |
| 79 | ||
| 80 | ||
| 81 | static ssize_t enable_write(struct file * file, char const __user * buf, size_t count, loff_t * offset) | |
| 82 | { | |
| 83 | unsigned long val; | |
| 84 | int retval; | |
| 85 | ||
| 86 | if (*offset) | |
| 87 | return -EINVAL; | |
| 88 | ||
| 89 | retval = oprofilefs_ulong_from_user(&val, buf, count); | |
| 90 | if (retval) | |
| 91 | return retval; | |
| 92 | ||
| 93 | if (val) | |
| 94 | retval = oprofile_start(); | |
| 95 | else | |
| 96 | oprofile_stop(); | |
| 97 | ||
| 98 | if (retval) | |
| 99 | return retval; | |
| 100 | return count; | |
| 101 | } | |
| 102 | ||
| 103 | ||
| 104 | static struct file_operations enable_fops = { | |
| 105 | .read = enable_read, | |
| 106 | .write = enable_write, | |
| 107 | }; | |
| 108 | ||
| 109 | ||
| 110 | static ssize_t dump_write(struct file * file, char const __user * buf, size_t count, loff_t * offset) | |
| 111 | { | |
| 112 | wake_up_buffer_waiter(); | |
| 113 | return count; | |
| 114 | } | |
| 115 | ||
| 116 | ||
| 117 | static struct file_operations dump_fops = { | |
| 118 | .write = dump_write, | |
| 119 | }; | |
| 120 | ||
| 121 | void oprofile_create_files(struct super_block * sb, struct dentry * root) | |
| 122 | { | |
| 123 | oprofilefs_create_file(sb, root, "enable", &enable_fops); | |
| 124 | oprofilefs_create_file_perm(sb, root, "dump", &dump_fops, 0666); | |
| 125 | oprofilefs_create_file(sb, root, "buffer", &event_buffer_fops); | |
| 126 | oprofilefs_create_ulong(sb, root, "buffer_size", &fs_buffer_size); | |
| 127 | oprofilefs_create_ulong(sb, root, "buffer_watershed", &fs_buffer_watershed); | |
| 128 | oprofilefs_create_ulong(sb, root, "cpu_buffer_size", &fs_cpu_buffer_size); | |
| 129 | oprofilefs_create_file(sb, root, "cpu_type", &cpu_type_fops); | |
| 130 | oprofilefs_create_file(sb, root, "backtrace_depth", &depth_fops); | |
| 131 | oprofilefs_create_file(sb, root, "pointer_size", &pointer_size_fops); | |
| 132 | oprofile_create_stats_files(sb, root); | |
| 133 | if (oprofile_ops.create_files) | |
| 134 | oprofile_ops.create_files(sb, root); | |
| 135 | } |