1/* 2 * Copyright © 2007 Intel Corporation 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice (including the next 12 * paragraph) shall be included in all copies or substantial portions of the 13 * Software. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS 21 * IN THE SOFTWARE. 22 * 23 * Authors: 24 * Eric Anholt <eric@anholt.net> 25 * 26 */ 27 28/** @file lock.c 29 * Tests various potential failures of the DRM locking mechanisms 30 */ 31 32#include <limits.h> 33#include "drmtest.h" 34 35enum auth_event { 36 SERVER_READY, 37 CLIENT_MAGIC, 38 SERVER_LOCKED, 39 CLIENT_LOCKED, 40}; 41 42int commfd[2]; 43unsigned int lock1 = 0x00001111; 44unsigned int lock2 = 0x00002222; 45 46/* return time in milliseconds */ 47static unsigned int 48get_millis() 49{ 50 struct timeval tv; 51 52 gettimeofday(&tv, NULL); 53 return tv.tv_sec * 1000 + tv.tv_usec / 1000; 54} 55 56static void 57wait_event(int pipe, enum auth_event expected_event) 58{ 59 int ret; 60 enum auth_event event; 61 unsigned char in; 62 63 ret = read(commfd[pipe], &in, 1); 64 if (ret == -1) 65 err(1, "read error"); 66 event = in; 67 68 if (event != expected_event) 69 errx(1, "unexpected event: %d\n", event); 70} 71 72static void 73send_event(int pipe, enum auth_event send_event) 74{ 75 int ret; 76 unsigned char event; 77 78 event = send_event; 79 ret = write(commfd[pipe], &event, 1); 80 if (ret == -1) 81 err(1, "failed to send event %d", event); 82} 83 84static void 85client_auth(int drmfd) 86{ 87 struct drm_auth auth; 88 int ret; 89 90 /* Get a client magic number and pass it to the master for auth. */ 91 ret = ioctl(drmfd, DRM_IOCTL_GET_MAGIC, &auth); 92 if (ret == -1) 93 err(1, "Couldn't get client magic"); 94 send_event(0, CLIENT_MAGIC); 95 ret = write(commfd[0], &auth.magic, sizeof(auth.magic)); 96 if (ret == -1) 97 err(1, "Couldn't write auth data"); 98} 99 100static void 101server_auth(int drmfd) 102{ 103 struct drm_auth auth; 104 int ret; 105 106 send_event(1, SERVER_READY); 107 wait_event(1, CLIENT_MAGIC); 108 ret = read(commfd[1], &auth.magic, sizeof(auth.magic)); 109 if (ret == -1) 110 err(1, "Failure to read client magic"); 111 112 ret = ioctl(drmfd, DRM_IOCTL_AUTH_MAGIC, &auth); 113 if (ret == -1) 114 err(1, "Failure to authenticate client magic\n"); 115} 116 117/** Tests that locking is successful in normal conditions */ 118static void 119test_lock_unlock(int drmfd) 120{ 121 int ret; 122 123 ret = drmGetLock(drmfd, lock1, 0); 124 if (ret != 0) 125 err(1, "Locking failed"); 126 ret = drmUnlock(drmfd, lock1); 127 if (ret != 0) 128 err(1, "Unlocking failed"); 129} 130 131/** Tests that unlocking the lock while it's not held works correctly */ 132static void 133test_unlock_unlocked(int drmfd) 134{ 135 int ret; 136 137 ret = drmUnlock(drmfd, lock1); 138 if (ret == 0) 139 err(1, "Unlocking unlocked lock succeeded"); 140} 141 142/** Tests that unlocking a lock held by another context fails appropriately */ 143static void 144test_unlock_unowned(int drmfd) 145{ 146 int ret; 147 148 ret = drmGetLock(drmfd, lock1, 0); 149 assert(ret == 0); 150 ret = drmUnlock(drmfd, lock2); 151 if (ret == 0) 152 errx(1, "Unlocking other context's lock succeeded"); 153 ret = drmUnlock(drmfd, lock1); 154 assert(ret == 0); 155} 156 157/** 158 * Tests that an open/close by the same process doesn't result in the lock 159 * being dropped. 160 */ 161static void test_open_close_locked(drmfd) 162{ 163 int ret, tempfd; 164 165 ret = drmGetLock(drmfd, lock1, 0); 166 assert(ret == 0); 167 /* XXX: Need to make sure that this is the same device as drmfd */ 168 tempfd = drm_open_any(); 169 close(tempfd); 170 ret = drmUnlock(drmfd, lock1); 171 if (ret != 0) 172 errx(1, "lock lost during open/close by same pid"); 173} 174 175static void client() 176{ 177 int drmfd, ret; 178 unsigned int time; 179 180 wait_event(0, SERVER_READY); 181 182 /* XXX: Should make sure we open the same DRM as the master */ 183 drmfd = drm_open_any(); 184 185 client_auth(drmfd); 186 187 /* Wait for the server to grab the lock, then grab it ourselves (to 188 * contest it). Hopefully we hit it within the window of when the 189 * server locks. 190 */ 191 wait_event(0, SERVER_LOCKED); 192 ret = drmGetLock(drmfd, lock2, 0); 193 time = get_millis(); 194 if (ret != 0) 195 err(1, "Failed to get lock on client\n"); 196 drmUnlock(drmfd, lock2); 197 198 /* Tell the server that our locking completed, and when it did */ 199 send_event(0, CLIENT_LOCKED); 200 ret = write(commfd[0], &time, sizeof(time)); 201 202 close(drmfd); 203 exit(0); 204} 205 206static void server() 207{ 208 int drmfd, tempfd, ret; 209 unsigned int client_time, unlock_time; 210 211 drmfd = drm_open_any_master(); 212 213 test_lock_unlock(drmfd); 214 test_unlock_unlocked(drmfd); 215 test_unlock_unowned(drmfd); 216 test_open_close_locked(drmfd); 217 218 /* Perform the authentication sequence with the client. */ 219 server_auth(drmfd); 220 221 /* Now, test that the client attempting to lock while the server 222 * holds the lock works correctly. 223 */ 224 ret = drmGetLock(drmfd, lock1, 0); 225 assert(ret == 0); 226 send_event(1, SERVER_LOCKED); 227 /* Wait a while for the client to do its thing */ 228 sleep(1); 229 ret = drmUnlock(drmfd, lock1); 230 assert(ret == 0); 231 unlock_time = get_millis(); 232 233 wait_event(1, CLIENT_LOCKED); 234 ret = read(commfd[1], &client_time, sizeof(client_time)); 235 if (ret == -1) 236 err(1, "Failure to read client magic"); 237 238 if (client_time < unlock_time) 239 errx(1, "Client took lock before server released it"); 240 241 close(drmfd); 242} 243 244int main(int argc, char **argv) 245{ 246 int ret; 247 248 249 ret = pipe(commfd); 250 if (ret == -1) 251 err(1, "Couldn't create pipe"); 252 253 ret = fork(); 254 if (ret == -1) 255 err(1, "failure to fork client"); 256 if (ret == 0) 257 client(); 258 else 259 server(); 260 261 return 0; 262} 263 264