1 /*
2 * Copyright (C) 2021 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 //#define LOG_NDEBUG 0
18 #define LOG_TAG "C2FenceFactory"
19 #include <utils/Log.h>
20
21 #include <C2FenceFactory.h>
22 #include <C2SurfaceSyncObj.h>
23
24 class C2Fence::Impl {
25 public:
26 virtual c2_status_t wait(c2_nsecs_t timeoutNs) = 0;
27
28 virtual bool valid() const = 0;
29
30 virtual bool ready() const = 0;
31
32 virtual int fd() const = 0;
33
34 virtual bool isHW() const = 0;
35
36 virtual ~Impl() = default;
37
38 Impl() = default;
39 };
40
wait(c2_nsecs_t timeoutNs)41 c2_status_t C2Fence::wait(c2_nsecs_t timeoutNs) {
42 if (mImpl) {
43 return mImpl->wait(timeoutNs);
44 }
45 // null fence is always signalled.
46 return C2_OK;
47 }
48
valid() const49 bool C2Fence::valid() const {
50 if (mImpl) {
51 return mImpl->valid();
52 }
53 // null fence is always valid.
54 return true;
55 }
56
ready() const57 bool C2Fence::ready() const {
58 if (mImpl) {
59 return mImpl->ready();
60 }
61 // null fence is always signalled.
62 return true;
63 }
64
fd() const65 int C2Fence::fd() const {
66 if (mImpl) {
67 return mImpl->fd();
68 }
69 // null fence does not have fd.
70 return -1;
71 }
72
isHW() const73 bool C2Fence::isHW() const {
74 if (mImpl) {
75 return mImpl->isHW();
76 }
77 return false;
78 }
79
80 /**
81 * Fence implementation for C2BufferQueueBlockPool based block allocation.
82 * The implementation supports all C2Fence interface except fd().
83 */
84 class _C2FenceFactory::SurfaceFenceImpl: public C2Fence::Impl {
85 public:
wait(c2_nsecs_t timeoutNs)86 virtual c2_status_t wait(c2_nsecs_t timeoutNs) {
87 if (mPtr) {
88 return mPtr->waitForChange(mWaitId, timeoutNs);
89 }
90 return C2_OK;
91 }
92
valid() const93 virtual bool valid() const {
94 return mPtr;
95 }
96
ready() const97 virtual bool ready() const {
98 uint32_t status;
99 if (mPtr) {
100 mPtr->lock();
101 status = mPtr->getWaitIdLocked();
102 mPtr->unlock();
103
104 return status != mWaitId;
105 }
106 return true;
107 }
108
fd() const109 virtual int fd() const {
110 // does not support fd, since this is shared mem and futex based
111 return -1;
112 }
113
isHW() const114 virtual bool isHW() const {
115 return false;
116 }
117
~SurfaceFenceImpl()118 virtual ~SurfaceFenceImpl() {};
119
SurfaceFenceImpl(std::shared_ptr<C2SurfaceSyncMemory> syncMem,uint32_t waitId)120 SurfaceFenceImpl(std::shared_ptr<C2SurfaceSyncMemory> syncMem, uint32_t waitId) :
121 mSyncMem(syncMem),
122 mPtr(syncMem ? syncMem->mem() : nullptr),
123 mWaitId(syncMem ? waitId : 0) {}
124 private:
125 const std::shared_ptr<const C2SurfaceSyncMemory> mSyncMem; // This is for life-cycle guarantee
126 C2SyncVariables *const mPtr;
127 const uint32_t mWaitId;
128 };
129
C2Fence(std::shared_ptr<Impl> impl)130 C2Fence::C2Fence(std::shared_ptr<Impl> impl) : mImpl(impl) {}
131
CreateSurfaceFence(std::shared_ptr<C2SurfaceSyncMemory> syncMem,uint32_t waitId)132 C2Fence _C2FenceFactory::CreateSurfaceFence(
133 std::shared_ptr<C2SurfaceSyncMemory> syncMem,
134 uint32_t waitId) {
135 if (syncMem) {
136 C2Fence::Impl *p
137 = new _C2FenceFactory::SurfaceFenceImpl(syncMem, waitId);
138 if (p->valid()) {
139 return C2Fence(std::shared_ptr<C2Fence::Impl>(p));
140 } else {
141 delete p;
142 }
143 }
144 return C2Fence();
145 }
146