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 #include <limits.h> 18 #include <errno.h> 19 #include <pthread.h> 20 #include <unistd.h> 21 #include <string.h> 22 23 #include <sys/mman.h> 24 #include <sys/stat.h> 25 #include <sys/types.h> 26 27 #include <cutils/log.h> 28 #include <cutils/atomic.h> 29 30 #include <hardware/hardware.h> 31 #include <hardware/gralloc.h> 32 33 #include "gralloc_priv.h" 34 35 #include <ion/ion.h> 36 #include <linux/ion.h> 37 38 /*****************************************************************************/ 39 40 static int gralloc_map(gralloc_module_t const* module, buffer_handle_t handle) 41 { 42 private_handle_t* hnd = (private_handle_t*)handle; 43 44 void* mappedAddress = mmap(0, hnd->size, PROT_READ|PROT_WRITE, MAP_SHARED, 45 hnd->fd, 0); 46 if (mappedAddress == MAP_FAILED) { 47 ALOGE("%s: could not mmap %s", __func__, strerror(errno)); 48 return -errno; 49 } 50 ALOGV("%s: base %p %d %d %d %d\n", __func__, mappedAddress, hnd->size, 51 hnd->width, hnd->height, hnd->stride); 52 hnd->base = mappedAddress; 53 return 0; 54 } 55 56 static int gralloc_unmap(gralloc_module_t const* module, buffer_handle_t handle) 57 { 58 private_handle_t* hnd = (private_handle_t*)handle; 59 60 if (!hnd->base) 61 return 0; 62 63 if (munmap(hnd->base, hnd->size) < 0) { 64 ALOGE("%s :could not unmap %s %p %d", __func__, strerror(errno), 65 hnd->base, hnd->size); 66 } 67 ALOGV("%s: base %p %d %d %d %d\n", __func__, hnd->base, hnd->size, 68 hnd->width, hnd->height, hnd->stride); 69 hnd->base = 0; 70 return 0; 71 } 72 73 /*****************************************************************************/ 74 75 int getIonFd(gralloc_module_t const *module) 76 { 77 private_module_t* m = const_cast<private_module_t*>(reinterpret_cast<const private_module_t*>(module)); 78 if (m->ionfd == -1) 79 m->ionfd = ion_open(); 80 return m->ionfd; 81 } 82 83 static pthread_mutex_t sMapLock = PTHREAD_MUTEX_INITIALIZER; 84 85 /*****************************************************************************/ 86 87 int gralloc_register_buffer(gralloc_module_t const* module, 88 buffer_handle_t handle) 89 { 90 if (private_handle_t::validate(handle) < 0) 91 return -EINVAL; 92 93 private_handle_t* hnd = (private_handle_t*)handle; 94 ALOGV("%s: base %p %d %d %d %d\n", __func__, hnd->base, hnd->size, 95 hnd->width, hnd->height, hnd->stride); 96 97 int ret; 98 ret = ion_import(getIonFd(module), hnd->fd, &hnd->handle); 99 if (ret) 100 ALOGE("error importing handle %d %x\n", hnd->fd, hnd->format); 101 if (hnd->fd1 >= 0) { 102 ret = ion_import(getIonFd(module), hnd->fd1, &hnd->handle1); 103 if (ret) 104 ALOGE("error importing handle1 %d %x\n", hnd->fd1, hnd->format); 105 } 106 if (hnd->fd2 >= 0) { 107 ret = ion_import(getIonFd(module), hnd->fd2, &hnd->handle2); 108 if (ret) 109 ALOGE("error importing handle2 %d %x\n", hnd->fd2, hnd->format); 110 } 111 112 return ret; 113 } 114 115 int gralloc_unregister_buffer(gralloc_module_t const* module, 116 buffer_handle_t handle) 117 { 118 if (private_handle_t::validate(handle) < 0) 119 return -EINVAL; 120 121 private_handle_t* hnd = (private_handle_t*)handle; 122 ALOGV("%s: base %p %d %d %d %d\n", __func__, hnd->base, hnd->size, 123 hnd->width, hnd->height, hnd->stride); 124 125 gralloc_unmap(module, handle); 126 127 if (hnd->handle) 128 ion_free(getIonFd(module), hnd->handle); 129 if (hnd->handle1) 130 ion_free(getIonFd(module), hnd->handle1); 131 if (hnd->handle2) 132 ion_free(getIonFd(module), hnd->handle2); 133 134 return 0; 135 } 136 137 int gralloc_lock(gralloc_module_t const* module, 138 buffer_handle_t handle, int usage, 139 int l, int t, int w, int h, 140 void** vaddr) 141 { 142 // this is called when a buffer is being locked for software 143 // access. in thin implementation we have nothing to do since 144 // not synchronization with the h/w is needed. 145 // typically this is used to wait for the h/w to finish with 146 // this buffer if relevant. the data cache may need to be 147 // flushed or invalidated depending on the usage bits and the 148 // hardware. 149 150 if (private_handle_t::validate(handle) < 0) 151 return -EINVAL; 152 153 private_handle_t* hnd = (private_handle_t*)handle; 154 if (!hnd->base) 155 gralloc_map(module, hnd); 156 *vaddr = (void*)hnd->base; 157 return 0; 158 } 159 160 int gralloc_unlock(gralloc_module_t const* module, 161 buffer_handle_t handle) 162 { 163 // we're done with a software buffer. nothing to do in this 164 // implementation. typically this is used to flush the data cache. 165 private_handle_t* hnd = (private_handle_t*)handle; 166 ion_sync_fd(getIonFd(module), hnd->fd); 167 if (hnd->fd1 >= 0) 168 ion_sync_fd(getIonFd(module), hnd->fd1); 169 if (hnd->fd2 >= 0) 170 ion_sync_fd(getIonFd(module), hnd->fd2); 171 172 if (private_handle_t::validate(handle) < 0) 173 return -EINVAL; 174 return 0; 175 } 176
