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 39namespace sdm { 40 41DisplayError 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 55DisplayError 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 82bool 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