drm/tests/lock.c

264 lines
5.9 KiB
C

/*
* Copyright © 2007 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
* Authors:
* Eric Anholt <eric@anholt.net>
*
*/
/** @file lock.c
* Tests various potential failures of the DRM locking mechanisms
*/
#include <limits.h>
#include "drmtest.h"
enum auth_event {
SERVER_READY,
CLIENT_MAGIC,
SERVER_LOCKED,
CLIENT_LOCKED,
};
int commfd[2];
unsigned int lock1 = 0x00001111;
unsigned int lock2 = 0x00002222;
/* return time in milliseconds */
static unsigned int
get_millis()
{
struct timeval tv;
gettimeofday(&tv, NULL);
return tv.tv_sec * 1000 + tv.tv_usec / 1000;
}
static void
wait_event(int pipe, enum auth_event expected_event)
{
int ret;
enum auth_event event;
unsigned char in;
ret = read(commfd[pipe], &in, 1);
if (ret == -1)
err(1, "read error");
event = in;
if (event != expected_event)
errx(1, "unexpected event: %d\n", event);
}
static void
send_event(int pipe, enum auth_event send_event)
{
int ret;
unsigned char event;
event = send_event;
ret = write(commfd[pipe], &event, 1);
if (ret == -1)
err(1, "failed to send event %d", event);
}
static void
client_auth(int drmfd)
{
struct drm_auth auth;
int ret;
/* Get a client magic number and pass it to the master for auth. */
ret = ioctl(drmfd, DRM_IOCTL_GET_MAGIC, &auth);
if (ret == -1)
err(1, "Couldn't get client magic");
send_event(0, CLIENT_MAGIC);
ret = write(commfd[0], &auth.magic, sizeof(auth.magic));
if (ret == -1)
err(1, "Couldn't write auth data");
}
static void
server_auth(int drmfd)
{
struct drm_auth auth;
int ret;
send_event(1, SERVER_READY);
wait_event(1, CLIENT_MAGIC);
ret = read(commfd[1], &auth.magic, sizeof(auth.magic));
if (ret == -1)
err(1, "Failure to read client magic");
ret = ioctl(drmfd, DRM_IOCTL_AUTH_MAGIC, &auth);
if (ret == -1)
err(1, "Failure to authenticate client magic\n");
}
/** Tests that locking is successful in normal conditions */
static void
test_lock_unlock(int drmfd)
{
int ret;
ret = drmGetLock(drmfd, lock1, 0);
if (ret != 0)
err(1, "Locking failed");
ret = drmUnlock(drmfd, lock1);
if (ret != 0)
err(1, "Unlocking failed");
}
/** Tests that unlocking the lock while it's not held works correctly */
static void
test_unlock_unlocked(int drmfd)
{
int ret;
ret = drmUnlock(drmfd, lock1);
if (ret == 0)
err(1, "Unlocking unlocked lock succeeded");
}
/** Tests that unlocking a lock held by another context fails appropriately */
static void
test_unlock_unowned(int drmfd)
{
int ret;
ret = drmGetLock(drmfd, lock1, 0);
assert(ret == 0);
ret = drmUnlock(drmfd, lock2);
if (ret == 0)
errx(1, "Unlocking other context's lock succeeded");
ret = drmUnlock(drmfd, lock1);
assert(ret == 0);
}
/**
* Tests that an open/close by the same process doesn't result in the lock
* being dropped.
*/
static void test_open_close_locked(drmfd)
{
int ret, tempfd;
ret = drmGetLock(drmfd, lock1, 0);
assert(ret == 0);
/* XXX: Need to make sure that this is the same device as drmfd */
tempfd = drm_open_any();
close(tempfd);
ret = drmUnlock(drmfd, lock1);
if (ret != 0)
errx(1, "lock lost during open/close by same pid");
}
static void client()
{
int drmfd, ret;
unsigned int time;
wait_event(0, SERVER_READY);
/* XXX: Should make sure we open the same DRM as the master */
drmfd = drm_open_any();
client_auth(drmfd);
/* Wait for the server to grab the lock, then grab it ourselves (to
* contest it). Hopefully we hit it within the window of when the
* server locks.
*/
wait_event(0, SERVER_LOCKED);
ret = drmGetLock(drmfd, lock2, 0);
time = get_millis();
if (ret != 0)
err(1, "Failed to get lock on client\n");
drmUnlock(drmfd, lock2);
/* Tell the server that our locking completed, and when it did */
send_event(0, CLIENT_LOCKED);
ret = write(commfd[0], &time, sizeof(time));
close(drmfd);
exit(0);
}
static void server()
{
int drmfd, tempfd, ret;
unsigned int client_time, unlock_time;
drmfd = drm_open_any_master();
test_lock_unlock(drmfd);
test_unlock_unlocked(drmfd);
test_unlock_unowned(drmfd);
test_open_close_locked(drmfd);
/* Perform the authentication sequence with the client. */
server_auth(drmfd);
/* Now, test that the client attempting to lock while the server
* holds the lock works correctly.
*/
ret = drmGetLock(drmfd, lock1, 0);
assert(ret == 0);
send_event(1, SERVER_LOCKED);
/* Wait a while for the client to do its thing */
sleep(1);
ret = drmUnlock(drmfd, lock1);
assert(ret == 0);
unlock_time = get_millis();
wait_event(1, CLIENT_LOCKED);
ret = read(commfd[1], &client_time, sizeof(client_time));
if (ret == -1)
err(1, "Failure to read client magic");
if (client_time < unlock_time)
errx(1, "Client took lock before server released it");
close(drmfd);
}
int main(int argc, char **argv)
{
int ret;
ret = pipe(commfd);
if (ret == -1)
err(1, "Couldn't create pipe");
ret = fork();
if (ret == -1)
err(1, "failure to fork client");
if (ret == 0)
client();
else
server();
return 0;
}