1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
|
// Copyright 2020 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "../AndroidPipe.h"
#include "base/Lock.h"
#include "../opengles.h"
#include <assert.h>
#include <atomic>
#include <memory>
#include <unordered_set>
#include <string.h>
using android::base::AutoLock;
using android::base::Lock;
namespace android {
namespace opengl {
struct ProcessPipeIdRegistry {
Lock lock;
std::unordered_set<uint64_t> ids;
};
static ProcessPipeIdRegistry sRegistry;
static bool sIdExistsInRegistry(uint64_t id) {
AutoLock lock(sRegistry.lock);
auto it = sRegistry.ids.find(id);
return it != sRegistry.ids.end();
}
namespace {
// GLProcessPipe is a pipe service that is used for releasing graphics resources
// per guest process. At the time being, guest processes can acquire host color
// buffer handles / EGLImage handles and they need to be properly released when
// guest process exits unexpectedly. This class is used to detect if guest
// process exits, so that a proper cleanup function can be called.
// It is done by setting up a pipe per guest process before acquiring color
// buffer handles. When guest process exits, the pipe will be closed, and
// onGuestClose() will trigger the cleanup path.
class GLProcessPipe : public AndroidPipe {
public:
//////////////////////////////////////////////////////////////////////////
// The pipe service class for this implementation.
class Service : public AndroidPipe::Service {
public:
Service() : AndroidPipe::Service("GLProcessPipe") {}
bool canLoad() const override { return true; }
AndroidPipe* create(void* hwPipe, const char* args, enum AndroidPipeFlags flags) override {
return new GLProcessPipe(hwPipe, this, flags);
}
AndroidPipe* load(void* hwPipe, const char* args,
base::Stream* stream) override {
return new GLProcessPipe(hwPipe, this, (AndroidPipeFlags)0, stream);
}
void preLoad(base::Stream* stream) override {
GLProcessPipe::s_headId.store(stream->getBe64());
}
void preSave(base::Stream* stream) override {
stream->putBe64(GLProcessPipe::s_headId.load());
}
};
GLProcessPipe(void* hwPipe, Service* service, enum AndroidPipeFlags flags,
base::Stream* loadStream = nullptr)
: AndroidPipe(hwPipe, service) {
if (loadStream) {
m_uniqueId = loadStream->getBe64();
m_hasData = (loadStream->getByte() != 0);
} else {
if (flags & ANDROID_PIPE_VIRTIO_GPU_BIT) {
m_uniqueId = (uint64_t)(uintptr_t)hwPipe;
s_headId = m_uniqueId;
} else {
m_uniqueId = ++s_headId;
}
}
AutoLock lock(sRegistry.lock);
sRegistry.ids.insert(m_uniqueId);
}
~GLProcessPipe() {
AutoLock lock(sRegistry.lock);
sRegistry.ids.erase(m_uniqueId);
}
void onSave(base::Stream* stream) override {
stream->putBe64(m_uniqueId);
stream->putByte(m_hasData ? 1 : 0);
}
void onGuestClose(PipeCloseReason reason) override {
if (sIdExistsInRegistry(m_uniqueId)) {
android_cleanupProcGLObjects(m_uniqueId);
}
delete this;
}
unsigned onGuestPoll() const override {
return PIPE_POLL_IN | PIPE_POLL_OUT;
}
int onGuestRecv(AndroidPipeBuffer* buffers, int numBuffers) override {
assert(buffers[0].size >= 8);
if (m_hasData) {
m_hasData = false;
memcpy(buffers[0].data, (const char*)&m_uniqueId, sizeof(m_uniqueId));
return sizeof(m_uniqueId);
} else {
return 0;
}
}
int onGuestSend(const AndroidPipeBuffer* buffers,
int numBuffers,
void** newPipePtr) override {
// The guest is supposed to send us a confirm code first. The code is
// 100 (4 byte integer).
assert(buffers[0].size >= 4);
int32_t confirmInt = *((int32_t*)buffers[0].data);
assert(confirmInt == 100);
(void)confirmInt;
m_hasData = true;
return buffers[0].size;
}
void onGuestWantWakeOn(int flags) override {}
private:
// An identifier for the guest process corresponding to this pipe.
// With very high probability, all currently-active processes have unique
// identifiers, since the IDs are assigned sequentially from a 64-bit ID
// space.
// Please change it if you ever have a use case that exhausts them
uint64_t m_uniqueId;
bool m_hasData = false;
static std::atomic<uint64_t> s_headId;
};
std::atomic<uint64_t> GLProcessPipe::s_headId {0};
}
void registerGLProcessPipeService() {
AndroidPipe::Service::add(std::make_unique<GLProcessPipe::Service>());
}
void forEachProcessPipeId(std::function<void(uint64_t)> f) {
AutoLock lock(sRegistry.lock);
for (auto id: sRegistry.ids) {
f(id);
}
}
void forEachProcessPipeIdRunAndErase(std::function<void(uint64_t)> f) {
AutoLock lock(sRegistry.lock);
auto it = sRegistry.ids.begin();
while (it != sRegistry.ids.end()) {
f(*it);
it = sRegistry.ids.erase(it);
}
}
}
}
|
