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