/** * @file oprofile_files.c * * @remark Copyright 2002 OProfile authors * @remark Read the file COPYING * * @author John Levon <levon@movementarian.org> */ #include <linux/fs.h> #include <linux/oprofile.h> #include <linux/jiffies.h> #include "event_buffer.h" #include "oprofile_stats.h" #include "oprof.h" #define BUFFER_SIZE_DEFAULT 131072 #define CPU_BUFFER_SIZE_DEFAULT 8192 #define BUFFER_WATERSHED_DEFAULT 32768 /* FIXME: tune */ #define TIME_SLICE_DEFAULT 1 unsigned long oprofile_buffer_size; unsigned long oprofile_cpu_buffer_size; unsigned long oprofile_buffer_watershed; unsigned long oprofile_time_slice; #ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX static ssize_t timeout_read(struct file *file, char __user *buf, size_t count, loff_t *offset) { return oprofilefs_ulong_to_user(jiffies_to_msecs(oprofile_time_slice), buf, count, offset); } static ssize_t timeout_write(struct file *file, char const __user *buf, size_t count, loff_t *offset) { unsigned long val; int retval; if (*offset) return -EINVAL; retval = oprofilefs_ulong_from_user(&val, buf, count); if (retval) return retval; retval = oprofile_set_timeout(val); if (retval) return retval; return count; } static const struct file_operations timeout_fops = { .read = timeout_read, .write = timeout_write, }; #endif static ssize_t depth_read(struct file *file, char __user *buf, size_t count, loff_t *offset) { return oprofilefs_ulong_to_user(oprofile_backtrace_depth, buf, count, offset); } static ssize_t depth_write(struct file *file, char const __user *buf, size_t count, loff_t *offset) { unsigned long val; int retval; if (*offset) return -EINVAL; retval = oprofilefs_ulong_from_user(&val, buf, count); if (retval) return retval; retval = oprofile_set_backtrace(val); if (retval) return retval; return count; } static const struct file_operations depth_fops = { .read = depth_read, .write = depth_write }; static ssize_t pointer_size_read(struct file *file, char __user *buf, size_t count, loff_t *offset) { return oprofilefs_ulong_to_user(sizeof(void *), buf, count, offset); } static const struct file_operations pointer_size_fops = { .read = pointer_size_read, }; static ssize_t cpu_type_read(struct file *file, char __user *buf, size_t count, loff_t *offset) { return oprofilefs_str_to_user(oprofile_ops.cpu_type, buf, count, offset); } static const struct file_operations cpu_type_fops = { .read = cpu_type_read, }; static ssize_t enable_read(struct file *file, char __user *buf, size_t count, loff_t *offset) { return oprofilefs_ulong_to_user(oprofile_started, buf, count, offset); } static ssize_t enable_write(struct file *file, char const __user *buf, size_t count, loff_t *offset) { unsigned long val; int retval; if (*offset) return -EINVAL; retval = oprofilefs_ulong_from_user(&val, buf, count); if (retval) return retval; if (val) retval = oprofile_start(); else oprofile_stop(); if (retval) return retval; return count; } static const struct file_operations enable_fops = { .read = enable_read, .write = enable_write, }; static ssize_t dump_write(struct file *file, char const __user *buf, size_t count, loff_t *offset) { wake_up_buffer_waiter(); return count; } static const struct file_operations dump_fops = { .write = dump_write, }; void oprofile_create_files(struct super_block *sb, struct dentry *root) { /* reinitialize default values */ oprofile_buffer_size = BUFFER_SIZE_DEFAULT; oprofile_cpu_buffer_size = CPU_BUFFER_SIZE_DEFAULT; oprofile_buffer_watershed = BUFFER_WATERSHED_DEFAULT; oprofile_time_slice = msecs_to_jiffies(TIME_SLICE_DEFAULT); oprofilefs_create_file(sb, root, "enable", &enable_fops); oprofilefs_create_file_perm(sb, root, "dump", &dump_fops, 0666); oprofilefs_create_file(sb, root, "buffer", &event_buffer_fops); oprofilefs_create_ulong(sb, root, "buffer_size", &oprofile_buffer_size); oprofilefs_create_ulong(sb, root, "buffer_watershed", &oprofile_buffer_watershed); oprofilefs_create_ulong(sb, root, "cpu_buffer_size", &oprofile_cpu_buffer_size); oprofilefs_create_file(sb, root, "cpu_type", &cpu_type_fops); oprofilefs_create_file(sb, root, "backtrace_depth", &depth_fops); oprofilefs_create_file(sb, root, "pointer_size", &pointer_size_fops); #ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX oprofilefs_create_file(sb, root, "time_slice", &timeout_fops); #endif oprofile_create_stats_files(sb, root); if (oprofile_ops.create_files) oprofile_ops.create_files(sb, root); }