composer/hwc_buffer_sync_handler.cpp

/*
* Copyright (c) 2015, 2019-2020, The Linux Foundation. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
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*    notice, this list of conditions and the following disclaimer.
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*    disclaimer in the documentation and/or other materials provided
*    with the distribution.
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*    from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
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#include <errno.h>
#include <sync/sync.h>
#include <utils/constants.h>
#include <utils/debug.h>
#include <utils/fence.h>

#include "hwc_debugger.h"
#include "hwc_buffer_sync_handler.h"

#define __CLASS__ "HWCBufferSyncHandler"

namespace sdm {

HWCBufferSyncHandler HWCBufferSyncHandler::g_hwc_buffer_sync_handler_;

HWCBufferSyncHandler::HWCBufferSyncHandler() {
  Fence::Set(this);
}

DisplayError HWCBufferSyncHandler::SyncWait(int fd, int timeout) {
  // Assume invalid fd as signaled.
  if (fd < 0) {
    return kErrorNone;
  }

  int error = sync_wait(fd, timeout);
  if (!error) {
    return kErrorNone;
  }

  // Fence is not signaled yet.
  if (errno == ETIME) {
    return kErrorTimeOut;
  }

  DLOGW("sync_wait fd = %d, timeout = %d ms, err = %d : %s", fd, timeout, errno, strerror(errno));

  return kErrorUndefined;
}

DisplayError HWCBufferSyncHandler::SyncMerge(int fd1, int fd2, int *merged_fd) {
  // Caller owns fds, hence, if
  //  one of the fence fd is invalid, create dup of valid fd and set to merged fd.
  //  both fence fds are same, create dup of one of the fd and set to merged fd.
  *merged_fd = -1;
  if (fd1 < 0) {
    *merged_fd = dup(fd2);
  } else if ((fd2 < 0) || (fd1 == fd2)) {
    *merged_fd = dup(fd1);
  } else {
    *merged_fd = sync_merge("SyncMerge", fd1, fd2);
  }

  return kErrorNone;
}

DisplayError HWCBufferSyncHandler::SyncWait(int fd) {
  // Deprecated.
  assert(false);
  return kErrorUndefined;
}

bool HWCBufferSyncHandler::IsSyncSignaled(int fd) {
  // Deprecated.
  assert(false);
  return false;
}

}  // namespace sdm