Add a set of tests for DRM locking, exposing issues on BSD.

1 files changed, 262 insertions, 0 deletions

diff --git a/tests/lock.c b/tests/lock.c
new file mode 100644
index 00000000..3f627558
--- /dev/null
+++ b/tests/lock.c
@@ -0,0 +1,262 @@
+/*
+ * 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;
+
+	wait_event(0, SERVER_READY);
+
+	/* 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");
+
+	close(drmfd);
+}
+
+static void client()
+{
+	int drmfd, ret;
+	unsigned int time;
+
+	/* 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));
+
+	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");
+}
+
+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;
+}
+