/*
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* Copyright (C) 2018 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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*/
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#pragma once
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#include "HostConnection.h"
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#include "IOStream.h"
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#include <stdlib.h>
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/* This file implements an IOStream that uses VIRTGPU_EXECBUFFER ioctls on a
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* virtio-gpu DRM rendernode device to communicate with the host.
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*/
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struct VirtioGpuCmd;
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class CrosGralloc : public Gralloc
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{
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friend class VirtioGpuStream;
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public:
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virtual uint32_t getHostHandle(native_handle_t const* handle);
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virtual int getFormat(native_handle_t const* handle);
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private:
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inline void setFd(int fd) { m_fd = fd; }
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int m_fd = -1;
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};
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class VirtioGpuProcessPipe : public ProcessPipe
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{
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public:
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virtual bool processPipeInit(renderControl_encoder_context_t *rcEnc);
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};
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class VirtioGpuStream : public IOStream
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{
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public:
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explicit VirtioGpuStream(size_t bufSize);
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~VirtioGpuStream();
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int connect();
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Gralloc *getGralloc() { return &m_gralloc; }
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ProcessPipe *getProcessPipe() { return &m_processPipe; }
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// override IOStream so we can see non-rounded allocation sizes
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virtual unsigned char *alloc(size_t len)
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{
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return static_cast<unsigned char *>(allocBuffer(len));
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}
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// override IOStream so we can model the caller's writes
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virtual int flush();
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virtual void *allocBuffer(size_t minSize);
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virtual int writeFully(const void *buf, size_t len);
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virtual const unsigned char *readFully(void *buf, size_t len);
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virtual int commitBuffer(size_t size);
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virtual const unsigned char *read(void *buf, size_t *inout_len) final
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{
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return readFully(buf, *inout_len);
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}
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bool valid()
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{
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return m_fd >= 0 && m_cmdResp_bo > 0 && m_cmdResp;
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}
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private:
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// rendernode fd
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int m_fd;
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// command memory buffer
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size_t m_bufSize;
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unsigned char *m_buf;
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// response buffer res handle
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uint32_t m_cmdResp_rh;
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// response buffer ttm buffer object
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uint32_t m_cmdResp_bo;
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// user mapping of response buffer object
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VirtioGpuCmd *m_cmdResp;
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// byte offset to read cursor for last response
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size_t m_cmdRespPos;
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// byte offset to command being assembled
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size_t m_cmdPos;
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// byte offset to flush cursor
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size_t m_flushPos;
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// byte counter of allocs since last command boundary
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size_t m_allocSize;
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// bytes of an alloc flushed through flush() API
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size_t m_allocFlushSize;
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// CrOS gralloc interface
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CrosGralloc m_gralloc;
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// Fake process pipe implementation
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VirtioGpuProcessPipe m_processPipe;
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// commits all commands, resets buffer offsets
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int commitAll();
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};
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