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1 /*
2  * Copyright (C) 2016 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_TAG "HidlMemoryCache"
18 #include "HidlMemoryCache.h"
19 #include <android/hidl/memory/1.0/IMemory.h>
20 #include <android/hidl/memory/token/1.0/IMemoryToken.h>
21 #include <hidlmemory/mapping.h>
22 #include <sys/mman.h>
23 #include <utils/Log.h>
24 
25 namespace android {
26 namespace hardware {
27 
28 using IMemoryToken = ::android::hidl::memory::token::V1_0::IMemoryToken;
29 using IMemory = ::android::hidl::memory::V1_0::IMemory;
30 
31 class IMemoryDecorator : public virtual IMemory {
32    public:
IMemoryDecorator(sp<IMemory> heap)33     IMemoryDecorator(sp<IMemory> heap) : mHeap(heap) {}
~IMemoryDecorator()34     virtual ~IMemoryDecorator(){};
update()35     Return<void> update() override { return mHeap->update(); }
read()36     Return<void> read() override { return mHeap->read(); };
updateRange(uint64_t start,uint64_t length)37     Return<void> updateRange(uint64_t start, uint64_t length) override {
38         return mHeap->updateRange(start, length);
39     }
readRange(uint64_t start,uint64_t length)40     Return<void> readRange(uint64_t start, uint64_t length) override {
41         return mHeap->readRange(start, length);
42     }
commit()43     Return<void> commit() override { return mHeap->commit(); }
44 
getPointer()45     Return<void*> getPointer() override { return mHeap->getPointer(); }
getSize()46     Return<uint64_t> getSize() override { return mHeap->getSize(); }
47 
48    protected:
49     sp<IMemory> mHeap;
50 };
51 
52 class IMemoryCacheable : public virtual IMemoryDecorator {
53    public:
IMemoryCacheable(sp<IMemory> heap,sp<IMemoryToken> key)54     IMemoryCacheable(sp<IMemory> heap, sp<IMemoryToken> key) : IMemoryDecorator(heap), mKey(key) {}
~IMemoryCacheable()55     virtual ~IMemoryCacheable() { HidlMemoryCache::getInstance()->flush(mKey); }
56 
57    protected:
58     sp<IMemoryToken> mKey;
59 };
60 
61 class IMemoryBlock : public virtual IMemoryDecorator {
62    public:
IMemoryBlock(sp<IMemory> heap,uint64_t size,uint64_t offset)63     IMemoryBlock(sp<IMemory> heap, uint64_t size, uint64_t offset)
64         : IMemoryDecorator(heap), mSize(size), mOffset(offset), mHeapSize(heap->getSize()) {}
validRange(uint64_t start,uint64_t length)65     bool validRange(uint64_t start, uint64_t length) {
66         return (start + length < mSize) && (start + length >= start) &&
67                (mOffset + mSize < mHeapSize);
68     }
readRange(uint64_t start,uint64_t length)69     Return<void> readRange(uint64_t start, uint64_t length) {
70         if (!validRange(start, length)) {
71             ALOGE("IMemoryBlock::readRange: out of range");
72             Status status;
73             status.setException(Status::EX_ILLEGAL_ARGUMENT, "out of range");
74             return Return<void>(status);
75         }
76         return mHeap->readRange(mOffset + start, length);
77     }
updateRange(uint64_t start,uint64_t length)78     Return<void> updateRange(uint64_t start, uint64_t length) override {
79         if (!validRange(start, length)) {
80             ALOGE("IMemoryBlock::updateRange: out of range");
81             return Void();
82         }
83         return mHeap->updateRange(mOffset + start, length);
84     }
getSize()85     Return<uint64_t> getSize() override { return mSize; }
getPointer()86     Return<void*> getPointer() override {
87         void* p = mHeap->getPointer();
88         return (static_cast<char*>(p) + mOffset);
89     }
90 
91    protected:
92     uint64_t mSize;
93     uint64_t mOffset;
94     uint64_t mHeapSize;
95 };
96 
getInstance()97 sp<HidlMemoryCache> HidlMemoryCache::getInstance() {
98     static sp<HidlMemoryCache> instance = new HidlMemoryCache();
99     return instance;
100 }
101 
fillLocked(const sp<IMemoryToken> & key)102 sp<IMemory> HidlMemoryCache::fillLocked(const sp<IMemoryToken>& key) {
103     sp<IMemory> memory = nullptr;
104     Return<void> ret = key->get(
105         [&](const hidl_memory& mem) { memory = new IMemoryCacheable(mapMemory(mem), key); });
106     if (!ret.isOk()) {
107         ALOGE("HidlMemoryCache::fill: cannot IMemoryToken::get.");
108         return nullptr;
109     }
110     mCached[key] = memory;
111     return memory;
112 }
113 
map(const MemoryBlock & memblk)114 sp<IMemory> HidlMemoryCache::map(const MemoryBlock& memblk) {
115     sp<IMemoryToken> token = memblk.token;
116     sp<IMemory> heap = fetch(token);
117     if (heap == nullptr) {
118         return nullptr;
119     }
120     return new IMemoryBlock(heap, memblk.size, memblk.offset);
121 }
122 
123 }  // namespace hardware
124 }  // namespace android
125