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/**
* @file event_buffer.c
*
* @remark Copyright 2002 OProfile authors
* @remark Read the file COPYING
*
* @author John Levon <levon@movementarian.org>
*
* This is the global event buffer that the user-space
* daemon reads from. The event buffer is an untyped array
* of unsigned longs. Entries are prefixed by the
* escape value ESCAPE_CODE followed by an identifying code.
*/
#include <linux/vmalloc.h>
#include <linux/oprofile.h>
#include <linux/sched.h>
#include <linux/capability.h>
#include <linux/dcookies.h>
#include <linux/fs.h>
#include <asm/uaccess.h>
#include "oprof.h"
#include "event_buffer.h"
#include "oprofile_stats.h"
DECLARE_MUTEX(buffer_sem);
static unsigned long buffer_opened;
static DECLARE_WAIT_QUEUE_HEAD(buffer_wait);
static unsigned long * event_buffer;
static unsigned long buffer_size;
static unsigned long buffer_watershed;
static size_t buffer_pos;
/* atomic_t because wait_event checks it outside of buffer_sem */
static atomic_t buffer_ready = ATOMIC_INIT(0);
/* Add an entry to the event buffer. When we
* get near to the end we wake up the process
* sleeping on the read() of the file.
*/
void add_event_entry(unsigned long value)
{
if (buffer_pos == buffer_size) {
atomic_inc(&oprofile_stats.event_lost_overflow);
return;
}
event_buffer[buffer_pos] = value;
if (++buffer_pos == buffer_size - buffer_watershed) {
atomic_set(&buffer_ready, 1);
wake_up(&buffer_wait);
}
}
/* Wake up the waiting process if any. This happens
* on "echo 0 >/dev/oprofile/enable" so the daemon
* processes the data remaining in the event buffer.
*/
void wake_up_buffer_waiter(void)
{
down(&buffer_sem);
atomic_set(&buffer_ready, 1);
wake_up(&buffer_wait);
up(&buffer_sem);
}
int alloc_event_buffer(void)
{
int err = -ENOMEM;
spin_lock(&oprofilefs_lock);
buffer_size = fs_buffer_size;
buffer_watershed = fs_buffer_watershed;
spin_unlock(&oprofilefs_lock);
if (buffer_watershed >= buffer_size)
return -EINVAL;
event_buffer = vmalloc(sizeof(unsigned long) * buffer_size);
if (!event_buffer)
goto out;
err = 0;
out:
return err;
}
void free_event_buffer(void)
{
vfree(event_buffer);
}
static int event_buffer_open(struct inode * inode, struct file * file)
{
int err = -EPERM;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (test_and_set_bit(0, &buffer_opened))
return -EBUSY;
/* Register as a user of dcookies
* to ensure they persist for the lifetime of
* the open event file
*/
err = -EINVAL;
file->private_data = dcookie_register();
if (!file->private_data)
goto out;
if ((err = oprofile_setup()))
goto fail;
/* NB: the actual start happens from userspace
* echo 1 >/dev/oprofile/enable
*/
return 0;
fail:
dcookie_unregister(file->private_data);
out:
clear_bit(0, &buffer_opened);
return err;
}
static int event_buffer_release(struct inode * inode, struct file * file)
{
oprofile_stop();
oprofile_shutdown();
dcookie_unregister(file->private_data);
buffer_pos = 0;
atomic_set(&buffer_ready, 0);
clear_bit(0, &buffer_opened);
return 0;
}
static ssize_t event_buffer_read(struct file * file, char __user * buf,
size_t count, loff_t * offset)
{
int retval = -EINVAL;
size_t const max = buffer_size * sizeof(unsigned long);
/* handling partial reads is more trouble than it's worth */
if (count != max || *offset)
return -EINVAL;
wait_event_interruptible(buffer_wait, atomic_read(&buffer_ready));
if (signal_pending(current))
return -EINTR;
/* can't currently happen */
if (!atomic_read(&buffer_ready))
return -EAGAIN;
down(&buffer_sem);
atomic_set(&buffer_ready, 0);
retval = -EFAULT;
count = buffer_pos * sizeof(unsigned long);
if (copy_to_user(buf, event_buffer, count))
goto out;
retval = count;
buffer_pos = 0;
out:
up(&buffer_sem);
return retval;
}
struct file_operations event_buffer_fops = {
.open = event_buffer_open,
.release = event_buffer_release,
.read = event_buffer_read,
};
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