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 39 namespace android { 40 41 // --------------------------------------------------------------------------- 42 43 MemoryHeapBase::MemoryHeapBase() 44 : mFD(-1), mSize(0), mBase(MAP_FAILED), 45 mDevice(NULL), mNeedUnmap(false), mOffset(0) 46 { 47 } 48 49 MemoryHeapBase::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), mOffset(0) 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 ALOGE_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 66 MemoryHeapBase::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), mOffset(0) 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 ALOGE_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 85 MemoryHeapBase::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), mOffset(0) 88 { 89 const size_t pagesize = getpagesize(); 90 size = ((size + pagesize-1) & ~(pagesize-1)); 91 mapfd(dup(fd), size, offset); 92 } 93 94 status_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 } 106 107 status_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 ALOGE("mmap(fd=%d, size=%u) failed (%s)", 131 fd, uint32_t(size), strerror(errno)); 132 close(fd); 133 return -errno; 134 } 135 //ALOGD("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 mOffset = offset; 145 return NO_ERROR; 146 } 147 148 MemoryHeapBase::~MemoryHeapBase() 149 { 150 dispose(); 151 } 152 153 void MemoryHeapBase::dispose() 154 { 155 int fd = android_atomic_or(-1, &mFD); 156 if (fd >= 0) { 157 if (mNeedUnmap) { 158 //ALOGD("munmap(fd=%d, base=%p, size=%lu)", fd, mBase, mSize); 159 munmap(mBase, mSize); 160 } 161 mBase = 0; 162 mSize = 0; 163 close(fd); 164 } 165 } 166 167 int MemoryHeapBase::getHeapID() const { 168 return mFD; 169 } 170 171 void* MemoryHeapBase::getBase() const { 172 return mBase; 173 } 174 175 size_t MemoryHeapBase::getSize() const { 176 return mSize; 177 } 178 179 uint32_t MemoryHeapBase::getFlags() const { 180 return mFlags; 181 } 182 183 const char* MemoryHeapBase::getDevice() const { 184 return mDevice; 185 } 186 187 uint32_t MemoryHeapBase::getOffset() const { 188 return mOffset; 189 } 190 191 // --------------------------------------------------------------------------- 192 }; // namespace android 193
