src/dawn_wire/server/ServerBuffer.cpp - dawn - Git at Google

 // Copyright 2019 The Dawn Authors
 //
 // 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 "common/Assert.h"
 #include "dawn_wire/BufferConsumer_impl.h"
 #include "dawn_wire/WireCmd_autogen.h"
 #include "dawn_wire/server/Server.h"

 #include <memory>

 namespace dawn_wire { namespace server {

     bool Server::PreHandleBufferUnmap(const BufferUnmapCmd& cmd) {
         auto* buffer = BufferObjects().Get(cmd.selfId);
         DAWN_ASSERT(buffer != nullptr);

         if (buffer->mappedAtCreation && !(buffer->usage & WGPUMapMode_Write)) {
             // This indicates the writeHandle is for mappedAtCreation only. Destroy on unmap
             // writeHandle could have possibly been deleted if buffer is already destroyed so we
             // don't assert it's non-null
             buffer->writeHandle = nullptr;
         }

         buffer->mapWriteState = BufferMapWriteState::Unmapped;

         return true;
     }

     bool Server::PreHandleBufferDestroy(const BufferDestroyCmd& cmd) {
         // Destroying a buffer does an implicit unmapping.
         auto* buffer = BufferObjects().Get(cmd.selfId);
         DAWN_ASSERT(buffer != nullptr);

         // The buffer was destroyed. Clear the Read/WriteHandle.
         buffer->readHandle = nullptr;
         buffer->writeHandle = nullptr;
         buffer->mapWriteState = BufferMapWriteState::Unmapped;

         return true;
     }

     bool Server::DoBufferMapAsync(ObjectId bufferId,
                                   uint64_t requestSerial,
                                   WGPUMapModeFlags mode,
                                   uint64_t offset64,
                                   uint64_t size64) {
         // These requests are just forwarded to the buffer, with userdata containing what the
         // client will require in the return command.

         // The null object isn't valid as `self`
         if (bufferId == 0) {
             return false;
         }

         auto* buffer = BufferObjects().Get(bufferId);
         if (buffer == nullptr) {
             return false;
         }

         std::unique_ptr<MapUserdata> userdata = MakeUserdata<MapUserdata>();
         userdata->buffer = ObjectHandle{bufferId, buffer->generation};
         userdata->bufferObj = buffer->handle;
         userdata->requestSerial = requestSerial;
         userdata->mode = mode;

         if (offset64 > std::numeric_limits<size_t>::max() ||
             size64 > std::numeric_limits<size_t>::max()) {
             OnBufferMapAsyncCallback(WGPUBufferMapAsyncStatus_Error, userdata.get());
             return true;
         }

         size_t offset = static_cast<size_t>(offset64);
         size_t size = static_cast<size_t>(size64);

         userdata->offset = offset;
         userdata->size = size;

         mProcs.bufferMapAsync(
             buffer->handle, mode, offset, size,
             ForwardToServer<decltype(
                 &Server::OnBufferMapAsyncCallback)>::Func<&Server::OnBufferMapAsyncCallback>(),
             userdata.release());

         return true;
     }

     bool Server::DoDeviceCreateBuffer(ObjectId deviceId,
                                       const WGPUBufferDescriptor* descriptor,
                                       ObjectHandle bufferResult,
                                       uint64_t readHandleCreateInfoLength,
                                       const uint8_t* readHandleCreateInfo,
                                       uint64_t writeHandleCreateInfoLength,
                                       const uint8_t* writeHandleCreateInfo) {
         auto* device = DeviceObjects().Get(deviceId);
         if (device == nullptr) {
             return false;
         }

         // Create and register the buffer object.
         auto* resultData = BufferObjects().Allocate(bufferResult.id);
         if (resultData == nullptr) {
             return false;
         }
         resultData->generation = bufferResult.generation;
         resultData->handle = mProcs.deviceCreateBuffer(device->handle, descriptor);
         resultData->deviceInfo = device->info.get();
         resultData->usage = descriptor->usage;
         resultData->mappedAtCreation = descriptor->mappedAtCreation;
         if (!TrackDeviceChild(resultData->deviceInfo, ObjectType::Buffer, bufferResult.id)) {
             return false;
         }

         // isReadMode and isWriteMode could be true at the same time if usage contains
         // WGPUMapMode_Read and buffer is mappedAtCreation
         bool isReadMode = descriptor->usage & WGPUMapMode_Read;
         bool isWriteMode = descriptor->usage & WGPUMapMode_Write || descriptor->mappedAtCreation;

         // This is the size of data deserialized from the command stream to create the read/write
         // handle, which must be CPU-addressable.
         if (readHandleCreateInfoLength > std::numeric_limits<size_t>::max() ||
             writeHandleCreateInfoLength > std::numeric_limits<size_t>::max() ||
             readHandleCreateInfoLength >
                 std::numeric_limits<size_t>::max() - writeHandleCreateInfoLength) {
             return false;
         }

         if (isWriteMode) {
             MemoryTransferService::WriteHandle* writeHandle = nullptr;
             // Deserialize metadata produced from the client to create a companion server handle.
             if (!mMemoryTransferService->DeserializeWriteHandle(
                     writeHandleCreateInfo, static_cast<size_t>(writeHandleCreateInfoLength),
                     &writeHandle)) {
                 return false;
             }
             ASSERT(writeHandle != nullptr);
             resultData->writeHandle.reset(writeHandle);
             writeHandle->SetDataLength(descriptor->size);

             if (descriptor->mappedAtCreation) {
                 void* mapping =
                     mProcs.bufferGetMappedRange(resultData->handle, 0, descriptor->size);
                 if (mapping == nullptr) {
                     // A zero mapping is used to indicate an allocation error of an error buffer.
                     // This is a valid case and isn't fatal. Remember the buffer is an error so as
                     // to skip subsequent mapping operations.
                     resultData->mapWriteState = BufferMapWriteState::MapError;
                     return true;
                 }
                 ASSERT(mapping != nullptr);
                 writeHandle->SetTarget(mapping);

                 resultData->mapWriteState = BufferMapWriteState::Mapped;
             }
         }

         if (isReadMode) {
             MemoryTransferService::ReadHandle* readHandle = nullptr;
             // Deserialize metadata produced from the client to create a companion server handle.
             if (!mMemoryTransferService->DeserializeReadHandle(
                     readHandleCreateInfo, static_cast<size_t>(readHandleCreateInfoLength),
                     &readHandle)) {
                 return false;
             }
             ASSERT(readHandle != nullptr);

             resultData->readHandle.reset(readHandle);
         }

         return true;
     }

     bool Server::DoBufferUpdateMappedData(ObjectId bufferId,
                                           uint64_t writeDataUpdateInfoLength,
                                           const uint8_t* writeDataUpdateInfo,
                                           uint64_t offset,
                                           uint64_t size) {
         // The null object isn't valid as `self`
         if (bufferId == 0) {
             return false;
         }

         if (writeDataUpdateInfoLength > std::numeric_limits<size_t>::max() ||
             offset > std::numeric_limits<size_t>::max() ||
             size > std::numeric_limits<size_t>::max()) {
             return false;
         }

         auto* buffer = BufferObjects().Get(bufferId);
         if (buffer == nullptr) {
             return false;
         }
         switch (buffer->mapWriteState) {
             case BufferMapWriteState::Unmapped:
                 return false;
             case BufferMapWriteState::MapError:
                 // The buffer is mapped but there was an error allocating mapped data.
                 // Do not perform the memcpy.
                 return true;
             case BufferMapWriteState::Mapped:
                 break;
         }
         if (!buffer->writeHandle) {
             // This check is performed after the check for the MapError state. It is permissible
             // to Unmap and attempt to update mapped data of an error buffer.
             return false;
         }

         // Deserialize the flush info and flush updated data from the handle into the target
         // of the handle. The target is set via WriteHandle::SetTarget.
         return buffer->writeHandle->DeserializeDataUpdate(
             writeDataUpdateInfo, static_cast<size_t>(writeDataUpdateInfoLength),
             static_cast<size_t>(offset), static_cast<size_t>(size));
     }

     void Server::OnBufferMapAsyncCallback(WGPUBufferMapAsyncStatus status, MapUserdata* data) {
         // Skip sending the callback if the buffer has already been destroyed.
         auto* bufferData = BufferObjects().Get(data->buffer.id);
         if (bufferData == nullptr || bufferData->generation != data->buffer.generation) {
             return;
         }

         bool isRead = data->mode & WGPUMapMode_Read;
         bool isSuccess = status == WGPUBufferMapAsyncStatus_Success;

         ReturnBufferMapAsyncCallbackCmd cmd;
         cmd.buffer = data->buffer;
         cmd.requestSerial = data->requestSerial;
         cmd.status = status;
         cmd.readDataUpdateInfoLength = 0;
         cmd.readDataUpdateInfo = nullptr;

         const void* readData = nullptr;
         if (isSuccess) {
             if (isRead) {
                 // Get the serialization size of the message to initialize ReadHandle data.
                 readData =
                     mProcs.bufferGetConstMappedRange(data->bufferObj, data->offset, data->size);
                 cmd.readDataUpdateInfoLength =
                     bufferData->readHandle->SizeOfSerializeDataUpdate(data->offset, data->size);
             } else {
                 ASSERT(data->mode & WGPUMapMode_Write);
                 // The in-flight map request returned successfully.
                 bufferData->mapWriteState = BufferMapWriteState::Mapped;
                 // Set the target of the WriteHandle to the mapped buffer data.
                 // writeHandle Target always refers to the buffer base address.
                 // but we call getMappedRange exactly with the range of data that is potentially
                 // modified (i.e. we don't want getMappedRange(0, wholeBufferSize) if only a
                 // subset of the buffer is actually mapped) in case the implementation does some
                 // range tracking.
                 bufferData->writeHandle->SetTarget(
                     static_cast<uint8_t*>(
                         mProcs.bufferGetMappedRange(data->bufferObj, data->offset, data->size)) -
                     data->offset);
             }
         }

         SerializeCommand(cmd, cmd.readDataUpdateInfoLength, [&](SerializeBuffer* serializeBuffer) {
             if (isSuccess && isRead) {
                 char* readHandleBuffer;
                 WIRE_TRY(serializeBuffer->NextN(cmd.readDataUpdateInfoLength, &readHandleBuffer));
                 // The in-flight map request returned successfully.
                 bufferData->readHandle->SerializeDataUpdate(readData, data->offset, data->size,
                                                             readHandleBuffer);
             }
             return WireResult::Success;
         });
     }

 }}  // namespace dawn_wire::server
	// Copyright 2019 The Dawn Authors
	//
	// 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 "common/Assert.h"
	#include "dawn_wire/BufferConsumer_impl.h"
	#include "dawn_wire/WireCmd_autogen.h"
	#include "dawn_wire/server/Server.h"

	#include <memory>

	namespace dawn_wire { namespace server {

	bool Server::PreHandleBufferUnmap(const BufferUnmapCmd& cmd) {
	auto* buffer = BufferObjects().Get(cmd.selfId);
	DAWN_ASSERT(buffer != nullptr);

	if (buffer->mappedAtCreation && !(buffer->usage & WGPUMapMode_Write)) {
	// This indicates the writeHandle is for mappedAtCreation only. Destroy on unmap
	// writeHandle could have possibly been deleted if buffer is already destroyed so we
	// don't assert it's non-null
	buffer->writeHandle = nullptr;
	}

	buffer->mapWriteState = BufferMapWriteState::Unmapped;

	return true;
	}

	bool Server::PreHandleBufferDestroy(const BufferDestroyCmd& cmd) {
	// Destroying a buffer does an implicit unmapping.
	auto* buffer = BufferObjects().Get(cmd.selfId);
	DAWN_ASSERT(buffer != nullptr);

	// The buffer was destroyed. Clear the Read/WriteHandle.
	buffer->readHandle = nullptr;
	buffer->writeHandle = nullptr;
	buffer->mapWriteState = BufferMapWriteState::Unmapped;

	return true;
	}

	bool Server::DoBufferMapAsync(ObjectId bufferId,
	uint64_t requestSerial,
	WGPUMapModeFlags mode,
	uint64_t offset64,
	uint64_t size64) {
	// These requests are just forwarded to the buffer, with userdata containing what the
	// client will require in the return command.

	// The null object isn't valid as `self`
	if (bufferId == 0) {
	return false;
	}

	auto* buffer = BufferObjects().Get(bufferId);
	if (buffer == nullptr) {
	return false;
	}

	std::unique_ptr<MapUserdata> userdata = MakeUserdata<MapUserdata>();
	userdata->buffer = ObjectHandle{bufferId, buffer->generation};
	userdata->bufferObj = buffer->handle;
	userdata->requestSerial = requestSerial;
	userdata->mode = mode;

	if (offset64 > std::numeric_limits<size_t>::max() \|\|
	size64 > std::numeric_limits<size_t>::max()) {
	OnBufferMapAsyncCallback(WGPUBufferMapAsyncStatus_Error, userdata.get());
	return true;
	}

	size_t offset = static_cast<size_t>(offset64);
	size_t size = static_cast<size_t>(size64);

	userdata->offset = offset;
	userdata->size = size;

	mProcs.bufferMapAsync(
	buffer->handle, mode, offset, size,
	ForwardToServer<decltype(
	&Server::OnBufferMapAsyncCallback)>::Func<&Server::OnBufferMapAsyncCallback>(),
	userdata.release());

	return true;
	}

	bool Server::DoDeviceCreateBuffer(ObjectId deviceId,
	const WGPUBufferDescriptor* descriptor,
	ObjectHandle bufferResult,
	uint64_t readHandleCreateInfoLength,
	const uint8_t* readHandleCreateInfo,
	uint64_t writeHandleCreateInfoLength,
	const uint8_t* writeHandleCreateInfo) {
	auto* device = DeviceObjects().Get(deviceId);
	if (device == nullptr) {
	return false;
	}

	// Create and register the buffer object.
	auto* resultData = BufferObjects().Allocate(bufferResult.id);
	if (resultData == nullptr) {
	return false;
	}
	resultData->generation = bufferResult.generation;
	resultData->handle = mProcs.deviceCreateBuffer(device->handle, descriptor);
	resultData->deviceInfo = device->info.get();
	resultData->usage = descriptor->usage;
	resultData->mappedAtCreation = descriptor->mappedAtCreation;
	if (!TrackDeviceChild(resultData->deviceInfo, ObjectType::Buffer, bufferResult.id)) {
	return false;
	}

	// isReadMode and isWriteMode could be true at the same time if usage contains
	// WGPUMapMode_Read and buffer is mappedAtCreation
	bool isReadMode = descriptor->usage & WGPUMapMode_Read;
	bool isWriteMode = descriptor->usage & WGPUMapMode_Write \|\| descriptor->mappedAtCreation;

	// This is the size of data deserialized from the command stream to create the read/write
	// handle, which must be CPU-addressable.
	if (readHandleCreateInfoLength > std::numeric_limits<size_t>::max() \|\|
	writeHandleCreateInfoLength > std::numeric_limits<size_t>::max() \|\|
	readHandleCreateInfoLength >
	std::numeric_limits<size_t>::max() - writeHandleCreateInfoLength) {
	return false;
	}

	if (isWriteMode) {
	MemoryTransferService::WriteHandle* writeHandle = nullptr;
	// Deserialize metadata produced from the client to create a companion server handle.
	if (!mMemoryTransferService->DeserializeWriteHandle(
	writeHandleCreateInfo, static_cast<size_t>(writeHandleCreateInfoLength),
	&writeHandle)) {
	return false;
	}
	ASSERT(writeHandle != nullptr);
	resultData->writeHandle.reset(writeHandle);
	writeHandle->SetDataLength(descriptor->size);

	if (descriptor->mappedAtCreation) {
	void* mapping =
	mProcs.bufferGetMappedRange(resultData->handle, 0, descriptor->size);
	if (mapping == nullptr) {
	// A zero mapping is used to indicate an allocation error of an error buffer.
	// This is a valid case and isn't fatal. Remember the buffer is an error so as
	// to skip subsequent mapping operations.
	resultData->mapWriteState = BufferMapWriteState::MapError;
	return true;
	}
	ASSERT(mapping != nullptr);
	writeHandle->SetTarget(mapping);

	resultData->mapWriteState = BufferMapWriteState::Mapped;
	}
	}

	if (isReadMode) {
	MemoryTransferService::ReadHandle* readHandle = nullptr;
	// Deserialize metadata produced from the client to create a companion server handle.
	if (!mMemoryTransferService->DeserializeReadHandle(
	readHandleCreateInfo, static_cast<size_t>(readHandleCreateInfoLength),
	&readHandle)) {
	return false;
	}
	ASSERT(readHandle != nullptr);

	resultData->readHandle.reset(readHandle);
	}

	return true;
	}

	bool Server::DoBufferUpdateMappedData(ObjectId bufferId,
	uint64_t writeDataUpdateInfoLength,
	const uint8_t* writeDataUpdateInfo,
	uint64_t offset,
	uint64_t size) {
	// The null object isn't valid as `self`
	if (bufferId == 0) {
	return false;
	}

	if (writeDataUpdateInfoLength > std::numeric_limits<size_t>::max() \|\|
	offset > std::numeric_limits<size_t>::max() \|\|
	size > std::numeric_limits<size_t>::max()) {
	return false;
	}

	auto* buffer = BufferObjects().Get(bufferId);
	if (buffer == nullptr) {
	return false;
	}
	switch (buffer->mapWriteState) {
	case BufferMapWriteState::Unmapped:
	return false;
	case BufferMapWriteState::MapError:
	// The buffer is mapped but there was an error allocating mapped data.
	// Do not perform the memcpy.
	return true;
	case BufferMapWriteState::Mapped:
	break;
	}
	if (!buffer->writeHandle) {
	// This check is performed after the check for the MapError state. It is permissible
	// to Unmap and attempt to update mapped data of an error buffer.
	return false;
	}

	// Deserialize the flush info and flush updated data from the handle into the target
	// of the handle. The target is set via WriteHandle::SetTarget.
	return buffer->writeHandle->DeserializeDataUpdate(
	writeDataUpdateInfo, static_cast<size_t>(writeDataUpdateInfoLength),
	static_cast<size_t>(offset), static_cast<size_t>(size));
	}

	void Server::OnBufferMapAsyncCallback(WGPUBufferMapAsyncStatus status, MapUserdata* data) {
	// Skip sending the callback if the buffer has already been destroyed.
	auto* bufferData = BufferObjects().Get(data->buffer.id);
	if (bufferData == nullptr \|\| bufferData->generation != data->buffer.generation) {
	return;
	}

	bool isRead = data->mode & WGPUMapMode_Read;
	bool isSuccess = status == WGPUBufferMapAsyncStatus_Success;

	ReturnBufferMapAsyncCallbackCmd cmd;
	cmd.buffer = data->buffer;
	cmd.requestSerial = data->requestSerial;
	cmd.status = status;
	cmd.readDataUpdateInfoLength = 0;
	cmd.readDataUpdateInfo = nullptr;

	const void* readData = nullptr;
	if (isSuccess) {
	if (isRead) {
	// Get the serialization size of the message to initialize ReadHandle data.
	readData =
	mProcs.bufferGetConstMappedRange(data->bufferObj, data->offset, data->size);
	cmd.readDataUpdateInfoLength =
	bufferData->readHandle->SizeOfSerializeDataUpdate(data->offset, data->size);
	} else {
	ASSERT(data->mode & WGPUMapMode_Write);
	// The in-flight map request returned successfully.
	bufferData->mapWriteState = BufferMapWriteState::Mapped;
	// Set the target of the WriteHandle to the mapped buffer data.
	// writeHandle Target always refers to the buffer base address.
	// but we call getMappedRange exactly with the range of data that is potentially
	// modified (i.e. we don't want getMappedRange(0, wholeBufferSize) if only a
	// subset of the buffer is actually mapped) in case the implementation does some
	// range tracking.
	bufferData->writeHandle->SetTarget(
	static_cast<uint8_t*>(
	mProcs.bufferGetMappedRange(data->bufferObj, data->offset, data->size)) -
	data->offset);
	}
	}

	SerializeCommand(cmd, cmd.readDataUpdateInfoLength, [&](SerializeBuffer* serializeBuffer) {
	if (isSuccess && isRead) {
	char* readHandleBuffer;
	WIRE_TRY(serializeBuffer->NextN(cmd.readDataUpdateInfoLength, &readHandleBuffer));
	// The in-flight map request returned successfully.
	bufferData->readHandle->SerializeDataUpdate(readData, data->offset, data->size,
	readHandleBuffer);
	}
	return WireResult::Success;
	});
	}

	}} // namespace dawn_wire::server