sys/external/bsd/drm/dist/tests/lock.c

   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
  35 enum auth_event {
  36         SERVER_READY,
  37         CLIENT_MAGIC,
  38         SERVER_LOCKED,
  39         CLIENT_LOCKED,
  40 };
  41
  42 int commfd[2];
  43 unsigned int lock1 = 0x00001111;
  44 unsigned int lock2 = 0x00002222;
  45
  46 /* return time in milliseconds */
  47 static unsigned int
  48 get_millis()
  49 {
  50         struct timeval tv;
  51
  52         gettimeofday(&tv, NULL);
  53         return tv.tv_sec * 1000 + tv.tv_usec / 1000;
  54 }
  55
  56 static void
  57 wait_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
  72 static void
  73 send_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
  84 static void
  85 client_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
 100 static void
 101 server_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 */
 118 static void
 119 test_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 */
 132 static void
 133 test_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 */
 143 static void
 144 test_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  */
 161 static 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
 175 static 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
 206 static 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
 244 int 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