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