MemoryHeapBase.cpp revision af1cf07134dccc884c654da0e713c9213d7be3f4
1/* 2 * Copyright (C) 2008 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#define LOG_TAG "MemoryHeapBase" 18 19#include <stdlib.h> 20#include <stdint.h> 21#include <unistd.h> 22#include <fcntl.h> 23#include <errno.h> 24#include <sys/types.h> 25#include <sys/stat.h> 26#include <sys/ioctl.h> 27 28#include <cutils/log.h> 29#include <cutils/ashmem.h> 30#include <cutils/atomic.h> 31 32#include <binder/MemoryHeapBase.h> 33 34#ifdef HAVE_ANDROID_OS 35#include <linux/android_pmem.h> 36#endif 37 38 39namespace android { 40 41// --------------------------------------------------------------------------- 42 43MemoryHeapBase::MemoryHeapBase() 44 : mFD(-1), mSize(0), mBase(MAP_FAILED), 45 mDevice(NULL), mNeedUnmap(false) 46{ 47} 48 49MemoryHeapBase::MemoryHeapBase(size_t size, uint32_t flags, char const * name) 50 : mFD(-1), mSize(0), mBase(MAP_FAILED), mFlags(flags), 51 mDevice(0), mNeedUnmap(false) 52{ 53 const size_t pagesize = getpagesize(); 54 size = ((size + pagesize-1) & ~(pagesize-1)); 55 int fd = ashmem_create_region(name == NULL ? "MemoryHeapBase" : name, size); 56 LOGE_IF(fd<0, "error creating ashmem region: %s", strerror(errno)); 57 if (fd >= 0) { 58 if (mapfd(fd, size) == NO_ERROR) { 59 if (flags & READ_ONLY) { 60 ashmem_set_prot_region(fd, PROT_READ); 61 } 62 } 63 } 64} 65 66MemoryHeapBase::MemoryHeapBase(const char* device, size_t size, uint32_t flags) 67 : mFD(-1), mSize(0), mBase(MAP_FAILED), mFlags(flags), 68 mDevice(0), mNeedUnmap(false) 69{ 70 int open_flags = O_RDWR; 71 if (flags & NO_CACHING) 72 open_flags |= O_SYNC; 73 74 int fd = open(device, open_flags); 75 LOGE_IF(fd<0, "error opening %s: %s", device, strerror(errno)); 76 if (fd >= 0) { 77 const size_t pagesize = getpagesize(); 78 size = ((size + pagesize-1) & ~(pagesize-1)); 79 if (mapfd(fd, size) == NO_ERROR) { 80 mDevice = device; 81 } 82 } 83} 84 85MemoryHeapBase::MemoryHeapBase(int fd, size_t size, uint32_t flags, uint32_t offset) 86 : mFD(-1), mSize(0), mBase(MAP_FAILED), mFlags(flags), 87 mDevice(0), mNeedUnmap(false) 88{ 89 const size_t pagesize = getpagesize(); 90 size = ((size + pagesize-1) & ~(pagesize-1)); 91 mapfd(dup(fd), size, offset); 92} 93 94status_t MemoryHeapBase::init(int fd, void *base, int size, int flags, const char* device) 95{ 96 if (mFD != -1) { 97 return INVALID_OPERATION; 98 } 99 mFD = fd; 100 mBase = base; 101 mSize = size; 102 mFlags = flags; 103 mDevice = device; 104 return NO_ERROR; 105} 106 107status_t MemoryHeapBase::mapfd(int fd, size_t size, uint32_t offset) 108{ 109 if (size == 0) { 110 // try to figure out the size automatically 111#ifdef HAVE_ANDROID_OS 112 // first try the PMEM ioctl 113 pmem_region reg; 114 int err = ioctl(fd, PMEM_GET_TOTAL_SIZE, ®); 115 if (err == 0) 116 size = reg.len; 117#endif 118 if (size == 0) { // try fstat 119 struct stat sb; 120 if (fstat(fd, &sb) == 0) 121 size = sb.st_size; 122 } 123 // if it didn't work, let mmap() fail. 124 } 125 126 if ((mFlags & DONT_MAP_LOCALLY) == 0) { 127 void* base = (uint8_t*)mmap(0, size, 128 PROT_READ|PROT_WRITE, MAP_SHARED, fd, offset); 129 if (base == MAP_FAILED) { 130 LOGE("mmap(fd=%d, size=%u) failed (%s)", 131 fd, uint32_t(size), strerror(errno)); 132 close(fd); 133 return -errno; 134 } 135 //LOGD("mmap(fd=%d, base=%p, size=%lu)", fd, base, size); 136 mBase = base; 137 mNeedUnmap = true; 138 } else { 139 mBase = 0; // not MAP_FAILED 140 mNeedUnmap = false; 141 } 142 mFD = fd; 143 mSize = size; 144 return NO_ERROR; 145} 146 147MemoryHeapBase::~MemoryHeapBase() 148{ 149 dispose(); 150} 151 152void MemoryHeapBase::dispose() 153{ 154 int fd = android_atomic_or(-1, &mFD); 155 if (fd >= 0) { 156 if (mNeedUnmap) { 157 //LOGD("munmap(fd=%d, base=%p, size=%lu)", fd, mBase, mSize); 158 munmap(mBase, mSize); 159 } 160 mBase = 0; 161 mSize = 0; 162 close(fd); 163 } 164} 165 166int MemoryHeapBase::getHeapID() const { 167 return mFD; 168} 169 170void* MemoryHeapBase::getBase() const { 171 return mBase; 172} 173 174size_t MemoryHeapBase::getSize() const { 175 return mSize; 176} 177 178uint32_t MemoryHeapBase::getFlags() const { 179 return mFlags; 180} 181 182const char* MemoryHeapBase::getDevice() const { 183 return mDevice; 184} 185 186// --------------------------------------------------------------------------- 187}; // namespace android 188