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
32 #include <sync/sync.h>
33 #include <utils/constants.h>
34 #include <utils/debug.h>
35
36 #include "hwc_debugger.h"
37 #include "hwc_buffer_sync_handler.h"
38
39 #define __CLASS__ "HWCBufferSyncHandler"
40
41 namespace sdm {
42
SyncWait(int fd)43 DisplayError HWCBufferSyncHandler::SyncWait(int fd) {
44 int error = 0;
45
46 if (fd >= 0) {
47 error = sync_wait(fd, 1000);
48 if (error < 0) {
49 DLOGE("sync_wait error errno = %d, desc = %s", errno, strerror(errno));
50 return kErrorTimeOut;
51 }
52 }
53
54 return kErrorNone;
55 }
56
SyncMerge(int fd1,int fd2,int * merged_fd)57 DisplayError HWCBufferSyncHandler::SyncMerge(int fd1, int fd2, int *merged_fd) {
58 DisplayError error = kErrorNone;
59
60 // Merge the two fences. In the case where one of the fences is not a
61 // valid fence (e.g. NO_FENCE) merge the one valid fence with itself so
62 // that a new fence with the given name is created.
63 // TODO(user): "SyncMerge"string should be replaced with user-defined string to represent
64 // why it is merged.
65 if (fd1 >= 0 && fd2 >= 0) {
66 *merged_fd = sync_merge("SyncMerge", fd1, fd2);
67 } else if (fd1 >= 0) {
68 *merged_fd = sync_merge("SyncMerge", fd1, fd1);
69 } else if (fd2 >= 0) {
70 *merged_fd = sync_merge("SyncMerge", fd2, fd2);
71 } else {
72 *merged_fd = -1;
73 return kErrorNone;
74 }
75
76 if (*merged_fd == -1) {
77 DLOGE("Sync merge error! fd1 %d fd2 %d", fd1, fd2);
78 error = kErrorFileDescriptor;
79 }
80
81 return error;
82 }
83
IsSyncSignaled(int fd)84 bool HWCBufferSyncHandler::IsSyncSignaled(int fd) {
85 if (sync_wait(fd, 0) < 0) {
86 return false;
87 } else {
88 return true;
89 }
90 }
91
92 } // namespace sdm
93
94