1 /* 2 * Copyright (C) 2011 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 #ifndef __ADDRESS_SPACE_STREAM_H 17 #define __ADDRESS_SPACE_STREAM_H 18 19 #include "IOStream.h" 20 21 #include "address_space_graphics_types.h" 22 #include "goldfish_address_space.h" 23 24 class AddressSpaceStream; 25 26 AddressSpaceStream* createAddressSpaceStream(size_t bufSize); 27 28 #if defined(VIRTIO_GPU) && !defined(HOST_BUILD) 29 struct StreamCreate { 30 int streamHandle; 31 }; 32 33 AddressSpaceStream* createVirtioGpuAddressSpaceStream(const struct StreamCreate &streamCreate); 34 #endif 35 36 class AddressSpaceStream : public IOStream { 37 public: 38 explicit AddressSpaceStream( 39 address_space_handle_t handle, 40 uint32_t version, 41 struct asg_context context, 42 uint64_t ringOffset, 43 uint64_t writeBufferOffset, 44 bool virtioMode, 45 struct address_space_ops ops); 46 ~AddressSpaceStream(); 47 48 virtual size_t idealAllocSize(size_t len); 49 virtual void *allocBuffer(size_t minSize); 50 virtual int commitBuffer(size_t size); 51 virtual const unsigned char *readFully( void *buf, size_t len); 52 virtual const unsigned char *read( void *buf, size_t *inout_len); 53 virtual int writeFully(const void *buf, size_t len); 54 virtual int writeFullyAsync(const void *buf, size_t len); 55 virtual const unsigned char *commitBufferAndReadFully(size_t size, void *buf, size_t len); 56 getRendernodeFd()57 int getRendernodeFd() const { 58 #if defined(__Fuchsia__) 59 return -1; 60 #else 61 if (!m_virtioMode) return -1; 62 return m_handle; 63 #endif 64 } 65 66 private: 67 bool isInError() const; 68 ssize_t speculativeRead(unsigned char* readBuffer, size_t trySize); 69 void notifyAvailable(); 70 uint32_t getRelativeBufferPos(uint32_t pos); 71 void advanceWrite(); 72 void ensureConsumerFinishing(); 73 void ensureType1Finished(); 74 void ensureType3Finished(); 75 int type1Write(uint32_t offset, size_t size); 76 77 void backoff(); 78 void resetBackoff(); 79 80 bool m_virtioMode; 81 struct address_space_ops m_ops; 82 83 unsigned char* m_tmpBuf; 84 size_t m_tmpBufSize; 85 size_t m_tmpBufXferSize; 86 bool m_usingTmpBuf; 87 88 unsigned char* m_readBuf; 89 size_t m_read; 90 size_t m_readLeft; 91 92 address_space_handle_t m_handle; 93 uint32_t m_version; 94 struct asg_context m_context; 95 96 uint64_t m_ringOffset; 97 uint64_t m_writeBufferOffset; 98 99 uint32_t m_writeBufferSize; 100 uint32_t m_writeBufferMask; 101 unsigned char* m_buf; 102 unsigned char* m_writeStart; 103 uint32_t m_writeStep; 104 105 uint32_t m_notifs; 106 uint32_t m_written; 107 108 uint64_t m_backoffIters; 109 uint64_t m_backoffFactor; 110 111 size_t m_ringStorageSize; 112 }; 113 114 #endif 115