renesas/periject.git - Renesas periject clone

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Diffstat (limited to 'wiki/H3_ULCB.wiki')

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/* * 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 <sys/ioctl.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; }


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