/** * @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 "event_buffer.h" #include "oprofile_stats.h" #include "oprof.h" unsigned long fs_buffer_size = 131072; unsigned long fs_cpu_buffer_size = 8192; unsigned long fs_buffer_watershed = 32768; /* FIXME: tune */ static ssize_t depth_read(struct file * file, char __user * buf, size_t count, loff_t * offset) { return oprofilefs_ulong_to_user(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 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 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 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 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 struct file_operations dump_fops = { .write = dump_write, }; void oprofile_create_files(struct super_block * sb, struct dentry * root) { 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", &fs_buffer_size); oprofilefs_create_ulong(sb, root, "buffer_watershed", &fs_buffer_watershed); oprofilefs_create_ulong(sb, root, "cpu_buffer_size", &fs_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); oprofile_create_stats_files(sb, root); if (oprofile_ops.create_files) oprofile_ops.create_files(sb, root); }