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      1 /*
      2 * Copyright (c) 2015, The Linux Foundation. All rights reserved.
      3 *
      4 * Redistribution and use in source and binary forms, with or without
      5 * modification, are permitted provided that the following conditions are
      6 * met:
      7 *  * Redistributions of source code must retain the above copyright
      8 *    notice, this list of conditions and the following disclaimer.
      9 *  * Redistributions in binary form must reproduce the above
     10 *    copyright notice, this list of conditions and the following
     11 *    disclaimer in the documentation and/or other materials provided
     12 *    with the distribution.
     13 *  * Neither the name of The Linux Foundation nor the names of its
     14 *    contributors may be used to endorse or promote products derived
     15 *    from this software without specific prior written permission.
     16 *
     17 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
     18 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
     20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
     21 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     22 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
     24 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     25 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
     26 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
     27 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     28 */
     29 
     30 #include <sync/sync.h>
     31 #include <utils/constants.h>
     32 #include <utils/debug.h>
     33 
     34 #include "hwc_debugger.h"
     35 #include "hwc_buffer_sync_handler.h"
     36 
     37 #define __CLASS__ "HWCBufferSyncHandler"
     38 
     39 namespace sdm {
     40 
     41 DisplayError HWCBufferSyncHandler::SyncWait(int fd) {
     42   int error = 0;
     43 
     44   if (fd >= 0) {
     45     error = sync_wait(fd, 1000);
     46     if (error < 0) {
     47       DLOGE("sync_wait error errno = %d, desc = %s", errno,  strerror(errno));
     48       return kErrorTimeOut;
     49     }
     50   }
     51 
     52   return kErrorNone;
     53 }
     54 
     55 DisplayError HWCBufferSyncHandler::SyncMerge(int fd1, int fd2, int *merged_fd) {
     56   DisplayError error = kErrorNone;
     57 
     58   // Merge the two fences.  In the case where one of the fences is not a
     59   // valid fence (e.g. NO_FENCE) merge the one valid fence with itself so
     60   // that a new fence with the given name is created.
     61   // TODO(user): "SyncMerge"string should be replaced with user-defined string to represent
     62   // why it is merged.
     63   if (fd1 >= 0 && fd2 >= 0) {
     64     *merged_fd = sync_merge("SyncMerge", fd1, fd2);
     65   } else if (fd1 >= 0) {
     66     *merged_fd = sync_merge("SyncMerge", fd1, fd1);
     67   } else if (fd2 >= 0) {
     68     *merged_fd = sync_merge("SyncMerge", fd2, fd2);
     69   } else {
     70     DLOGE("Invalid arguments passed");
     71     return kErrorParameters;
     72   }
     73 
     74   if (*merged_fd == -1) {
     75     DLOGE("Sync merge error! fd1 %d fd2 %d", fd1, fd2);
     76     error = kErrorFileDescriptor;
     77   }
     78 
     79   return error;
     80 }
     81 
     82 bool HWCBufferSyncHandler::IsSyncSignaled(int fd) {
     83   if (sync_wait(fd, 0) < 0) {
     84     return false;
     85   } else {
     86     return true;
     87   }
     88 }
     89 
     90 }  // namespace sdm
     91 
     92