1 /* 2 * Copyright (C) 2018 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 #pragma once 18 19 #include "HostConnection.h" 20 #include "IOStream.h" 21 22 #include <stdlib.h> 23 24 /* This file implements an IOStream that uses VIRTGPU TRANSFER* ioctls on a 25 * virtio-gpu DRM rendernode device to communicate with a goldfish-pipe 26 * service on the host side. 27 */ 28 29 class VirtioGpuPipeStream : public IOStream { 30 public: 31 typedef enum { ERR_INVALID_SOCKET = -1000 } QemuPipeStreamError; 32 33 explicit VirtioGpuPipeStream(size_t bufsize = 10000); 34 ~VirtioGpuPipeStream(); 35 int connect(const char* serviceName = 0); 36 uint64_t initProcessPipe(); 37 38 virtual void *allocBuffer(size_t minSize); 39 virtual int commitBuffer(size_t size); 40 virtual const unsigned char *readFully( void *buf, size_t len); 41 virtual const unsigned char *commitBufferAndReadFully( 42 size_t size, void *buf, size_t len); 43 virtual const unsigned char *read( void *buf, size_t *inout_len); 44 valid()45 bool valid() { return m_fd >= 0; } getRendernodeFd()46 int getRendernodeFd() { return m_fd; } 47 int recv(void *buf, size_t len); 48 49 virtual int writeFully(const void *buf, size_t len); 50 51 int getSocket() const; 52 private: 53 // sync. Also resets the write position. 54 void wait(); 55 56 // transfer to/from host ops 57 ssize_t transferToHost(const void* buffer, size_t len); 58 ssize_t transferFromHost(void* buffer, size_t len); 59 60 int m_fd; // rendernode fd 61 62 uint32_t m_virtio_rh; // transfer buffer res handle 63 uint32_t m_virtio_bo; // transfer bo handle 64 unsigned char* m_virtio_mapped; // user mapping of bo 65 66 // intermediate buffer 67 size_t m_bufsize; 68 unsigned char *m_buf; 69 size_t m_read; 70 size_t m_readLeft; 71 72 size_t m_writtenPos; 73 74 VirtioGpuPipeStream(int sock, size_t bufSize); 75 }; 76