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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 <errno.h>
     31 #include <sync/sync.h>
     32 #include <utils/constants.h>
     33 #include <utils/debug.h>
     34 
     35 #include "hwc_debugger.h"
     36 #include "hwc_buffer_sync_handler.h"
     37 
     38 #define __CLASS__ "HWCBufferSyncHandler"
     39 
     40 namespace sdm {
     41 
     42 DisplayError HWCBufferSyncHandler::SyncWait(int fd) {
     43   int error = 0;
     44 
     45   if (fd >= 0) {
     46     error = sync_wait(fd, 1000);
     47     if (error < 0) {
     48       DLOGE("sync_wait error errno = %d, desc = %s", errno,  strerror(errno));
     49       return kErrorTimeOut;
     50     }
     51   }
     52 
     53   return kErrorNone;
     54 }
     55 
     56 DisplayError HWCBufferSyncHandler::SyncMerge(int fd1, int fd2, int *merged_fd) {
     57   DisplayError error = kErrorNone;
     58 
     59   // Merge the two fences.  In the case where one of the fences is not a
     60   // valid fence (e.g. NO_FENCE) merge the one valid fence with itself so
     61   // that a new fence with the given name is created.
     62   // TODO(user): "SyncMerge"string should be replaced with user-defined string to represent
     63   // why it is merged.
     64   if (fd1 >= 0 && fd2 >= 0) {
     65     *merged_fd = sync_merge("SyncMerge", fd1, fd2);
     66   } else if (fd1 >= 0) {
     67     *merged_fd = sync_merge("SyncMerge", fd1, fd1);
     68   } else if (fd2 >= 0) {
     69     *merged_fd = sync_merge("SyncMerge", fd2, fd2);
     70   } else {
     71     *merged_fd = -1;
     72     return kErrorNone;
     73   }
     74 
     75   if (*merged_fd == -1) {
     76     DLOGE("Sync merge error! fd1 %d fd2 %d", fd1, fd2);
     77     error = kErrorFileDescriptor;
     78   }
     79 
     80   return error;
     81 }
     82 
     83 bool HWCBufferSyncHandler::IsSyncSignaled(int fd) {
     84   if (sync_wait(fd, 0) < 0) {
     85     return false;
     86   } else {
     87     return true;
     88   }
     89 }
     90 
     91 }  // namespace sdm
     92 
     93