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
SyncWait(int fd)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
SyncMerge(int fd1,int fd2,int * merged_fd)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
IsSyncSignaled(int fd)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