| /* |
| * 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; |
| } |
| |