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 
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 
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 
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