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