gralloc/mapper.cpp

   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 }