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80 lines
2.3 KiB
80 lines
2.3 KiB
// Copyright 2016 The Android Open Source Project
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#pragma once
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#include "base/Compiler.h"
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#include "base/Stream.h"
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#include "base/Optional.h"
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#include "base/Lock.h"
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#include <unordered_map>
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#include <inttypes.h>
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using android::base::Optional;
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using android::base::kNullopt;
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namespace android {
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struct DmaBufferInfo {
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void* hwpipe = nullptr;
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uint64_t guestAddr = 0;
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uint64_t bufferSize = 0;
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Optional<void*> currHostAddr = kNullopt;
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};
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using DmaBufferMap = std::unordered_map<uint64_t, DmaBufferInfo>;
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class DmaMap {
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public:
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// Constructor.
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DmaMap() = default;
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// Destructor.
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virtual ~DmaMap() = default;
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void addBuffer(void* hwpipe, uint64_t addr, uint64_t bufferSize);
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void removeBuffer(uint64_t addr);
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void* getHostAddr(uint64_t addr);
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void invalidateHostMappings();
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void resetHostMappings();
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void* getPipeInstance(uint64_t addr);
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// get() / set are NOT thread-safe,
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// but we don't expect multiple threads to call this
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// concurrently at init time, and the worst that can happen is to leak
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// a single instance. (c.f. VmLock)
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static DmaMap* get();
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static DmaMap* set(DmaMap* dmaMap);
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// Snapshotting.
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void save(android::base::Stream* stream) const;
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void load(android::base::Stream* stream);
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protected:
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virtual void createMappingLocked(DmaBufferInfo* info);
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virtual void removeMappingLocked(DmaBufferInfo* info);
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// These are meant to be replaced by a real implementation
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// in subclasses.
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virtual void* doMap(uint64_t addr, uint64_t bufferSize) = 0;
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virtual void doUnmap(void* mapped, uint64_t bufferSize) = 0;
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DmaBufferMap mDmaBuffers;
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android::base::ReadWriteLock mLock;
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DISALLOW_COPY_ASSIGN_AND_MOVE(DmaMap);
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};
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} // namespace android
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