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 (at) 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 <sys/ioctl.h> 34 #include "drmtest.h" 35 36 enum auth_event { 37 SERVER_READY, 38 CLIENT_MAGIC, 39 SERVER_LOCKED, 40 CLIENT_LOCKED, 41 }; 42 43 int commfd[2]; 44 unsigned int lock1 = 0x00001111; 45 unsigned int lock2 = 0x00002222; 46 47 /* return time in milliseconds */ 48 static unsigned int 49 get_millis() 50 { 51 struct timeval tv; 52 53 gettimeofday(&tv, NULL); 54 return tv.tv_sec * 1000 + tv.tv_usec / 1000; 55 } 56 57 static void 58 wait_event(int pipe, enum auth_event expected_event) 59 { 60 int ret; 61 enum auth_event event; 62 unsigned char in; 63 64 ret = read(commfd[pipe], &in, 1); 65 if (ret == -1) 66 err(1, "read error"); 67 event = in; 68 69 if (event != expected_event) 70 errx(1, "unexpected event: %d\n", event); 71 } 72 73 static void 74 send_event(int pipe, enum auth_event send_event) 75 { 76 int ret; 77 unsigned char event; 78 79 event = send_event; 80 ret = write(commfd[pipe], &event, 1); 81 if (ret == -1) 82 err(1, "failed to send event %d", event); 83 } 84 85 static void 86 client_auth(int drmfd) 87 { 88 struct drm_auth auth; 89 int ret; 90 91 /* Get a client magic number and pass it to the master for auth. */ 92 ret = ioctl(drmfd, DRM_IOCTL_GET_MAGIC, &auth); 93 if (ret == -1) 94 err(1, "Couldn't get client magic"); 95 send_event(0, CLIENT_MAGIC); 96 ret = write(commfd[0], &auth.magic, sizeof(auth.magic)); 97 if (ret == -1) 98 err(1, "Couldn't write auth data"); 99 } 100 101 static void 102 server_auth(int drmfd) 103 { 104 struct drm_auth auth; 105 int ret; 106 107 send_event(1, SERVER_READY); 108 wait_event(1, CLIENT_MAGIC); 109 ret = read(commfd[1], &auth.magic, sizeof(auth.magic)); 110 if (ret == -1) 111 err(1, "Failure to read client magic"); 112 113 ret = ioctl(drmfd, DRM_IOCTL_AUTH_MAGIC, &auth); 114 if (ret == -1) 115 err(1, "Failure to authenticate client magic\n"); 116 } 117 118 /** Tests that locking is successful in normal conditions */ 119 static void 120 test_lock_unlock(int drmfd) 121 { 122 int ret; 123 124 ret = drmGetLock(drmfd, lock1, 0); 125 if (ret != 0) 126 err(1, "Locking failed"); 127 ret = drmUnlock(drmfd, lock1); 128 if (ret != 0) 129 err(1, "Unlocking failed"); 130 } 131 132 /** Tests that unlocking the lock while it's not held works correctly */ 133 static void 134 test_unlock_unlocked(int drmfd) 135 { 136 int ret; 137 138 ret = drmUnlock(drmfd, lock1); 139 if (ret == 0) 140 err(1, "Unlocking unlocked lock succeeded"); 141 } 142 143 /** Tests that unlocking a lock held by another context fails appropriately */ 144 static void 145 test_unlock_unowned(int drmfd) 146 { 147 int ret; 148 149 ret = drmGetLock(drmfd, lock1, 0); 150 assert(ret == 0); 151 ret = drmUnlock(drmfd, lock2); 152 if (ret == 0) 153 errx(1, "Unlocking other context's lock succeeded"); 154 ret = drmUnlock(drmfd, lock1); 155 assert(ret == 0); 156 } 157 158 /** 159 * Tests that an open/close by the same process doesn't result in the lock 160 * being dropped. 161 */ 162 static void test_open_close_locked(drmfd) 163 { 164 int ret, tempfd; 165 166 ret = drmGetLock(drmfd, lock1, 0); 167 assert(ret == 0); 168 /* XXX: Need to make sure that this is the same device as drmfd */ 169 tempfd = drm_open_any(); 170 close(tempfd); 171 ret = drmUnlock(drmfd, lock1); 172 if (ret != 0) 173 errx(1, "lock lost during open/close by same pid"); 174 } 175 176 static void client() 177 { 178 int drmfd, ret; 179 unsigned int time; 180 181 wait_event(0, SERVER_READY); 182 183 /* XXX: Should make sure we open the same DRM as the master */ 184 drmfd = drm_open_any(); 185 186 client_auth(drmfd); 187 188 /* Wait for the server to grab the lock, then grab it ourselves (to 189 * contest it). Hopefully we hit it within the window of when the 190 * server locks. 191 */ 192 wait_event(0, SERVER_LOCKED); 193 ret = drmGetLock(drmfd, lock2, 0); 194 time = get_millis(); 195 if (ret != 0) 196 err(1, "Failed to get lock on client\n"); 197 drmUnlock(drmfd, lock2); 198 199 /* Tell the server that our locking completed, and when it did */ 200 send_event(0, CLIENT_LOCKED); 201 ret = write(commfd[0], &time, sizeof(time)); 202 203 close(drmfd); 204 exit(0); 205 } 206 207 static void server() 208 { 209 int drmfd, tempfd, ret; 210 unsigned int client_time, unlock_time; 211 212 drmfd = drm_open_any_master(); 213 214 test_lock_unlock(drmfd); 215 test_unlock_unlocked(drmfd); 216 test_unlock_unowned(drmfd); 217 test_open_close_locked(drmfd); 218 219 /* Perform the authentication sequence with the client. */ 220 server_auth(drmfd); 221 222 /* Now, test that the client attempting to lock while the server 223 * holds the lock works correctly. 224 */ 225 ret = drmGetLock(drmfd, lock1, 0); 226 assert(ret == 0); 227 send_event(1, SERVER_LOCKED); 228 /* Wait a while for the client to do its thing */ 229 sleep(1); 230 ret = drmUnlock(drmfd, lock1); 231 assert(ret == 0); 232 unlock_time = get_millis(); 233 234 wait_event(1, CLIENT_LOCKED); 235 ret = read(commfd[1], &client_time, sizeof(client_time)); 236 if (ret == -1) 237 err(1, "Failure to read client magic"); 238 239 if (client_time < unlock_time) 240 errx(1, "Client took lock before server released it"); 241 242 close(drmfd); 243 } 244 245 int main(int argc, char **argv) 246 { 247 int ret; 248 249 250 ret = pipe(commfd); 251 if (ret == -1) 252 err(1, "Couldn't create pipe"); 253 254 ret = fork(); 255 if (ret == -1) 256 err(1, "failure to fork client"); 257 if (ret == 0) 258 client(); 259 else 260 server(); 261 262 return 0; 263 } 264 265
