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 grallocMap(gralloc_module_t const* module, private_handle_t *hnd)
  76 {
  77     return gralloc_map(module, hnd);
  78 }
  79
  80 int grallocUnmap(gralloc_module_t const* module, private_handle_t *hnd)
  81 {
  82     return gralloc_unmap(module, hnd);
  83 }
  84
  85 int getIonFd(gralloc_module_t const *module)
  86 {
  87     private_module_t* m = const_cast<private_module_t*>(reinterpret_cast<const private_module_t*>(module));
  88     if (m->ionfd == -1)
  89         m->ionfd = ion_open();
  90     return m->ionfd;
  91 }
  92
  93 static pthread_mutex_t sMapLock = PTHREAD_MUTEX_INITIALIZER;
  94
  95 /*****************************************************************************/
  96
  97 int gralloc_register_buffer(gralloc_module_t const* module,
  98                             buffer_handle_t handle)
  99 {
 100     int err;
 101     if (private_handle_t::validate(handle) < 0)
 102         return -EINVAL;
 103
 104     err = gralloc_map(module, handle);
 105
 106     private_handle_t* hnd = (private_handle_t*)handle;
 107     ALOGV("%s: base %p %d %d %d %d\n", __func__, hnd->base, hnd->size,
 108           hnd->width, hnd->height, hnd->stride);
 109
 110     int ret;
 111     ret = ion_import(getIonFd(module), hnd->fd, &hnd->handle);
 112     if (ret)
 113         ALOGE("error importing handle %d %x\n", hnd->fd, hnd->format);
 114     if (hnd->fd1 >= 0) {
 115         ret = ion_import(getIonFd(module), hnd->fd1, &hnd->handle1);
 116         if (ret)
 117             ALOGE("error importing handle1 %d %x\n", hnd->fd1, hnd->format);
 118     }
 119     if (hnd->fd2 >= 0) {
 120         ret = ion_import(getIonFd(module), hnd->fd2, &hnd->handle2);
 121         if (ret)
 122             ALOGE("error importing handle2 %d %x\n", hnd->fd2, hnd->format);
 123     }
 124
 125     return err;
 126 }
 127
 128 int gralloc_unregister_buffer(gralloc_module_t const* module,
 129                               buffer_handle_t handle)
 130 {
 131     if (private_handle_t::validate(handle) < 0)
 132         return -EINVAL;
 133
 134     private_handle_t* hnd = (private_handle_t*)handle;
 135     ALOGV("%s: base %p %d %d %d %d\n", __func__, hnd->base, hnd->size,
 136           hnd->width, hnd->height, hnd->stride);
 137
 138     gralloc_unmap(module, handle);
 139
 140     if (hnd->handle)
 141         ion_free(getIonFd(module), hnd->handle);
 142     if (hnd->handle1)
 143         ion_free(getIonFd(module), hnd->handle1);
 144     if (hnd->handle2)
 145         ion_free(getIonFd(module), hnd->handle2);
 146
 147     return 0;
 148 }
 149
 150 int gralloc_lock(gralloc_module_t const* module,
 151                  buffer_handle_t handle, int usage,
 152                  int l, int t, int w, int h,
 153                  void** vaddr)
 154 {
 155     // this is called when a buffer is being locked for software
 156     // access. in thin implementation we have nothing to do since
 157     // not synchronization with the h/w is needed.
 158     // typically this is used to wait for the h/w to finish with
 159     // this buffer if relevant. the data cache may need to be
 160     // flushed or invalidated depending on the usage bits and the
 161     // hardware.
 162
 163     if (private_handle_t::validate(handle) < 0)
 164         return -EINVAL;
 165
 166     private_handle_t* hnd = (private_handle_t*)handle;
 167     *vaddr = (void*)hnd->base;
 168     return 0;
 169 }
 170
 171 int gralloc_unlock(gralloc_module_t const* module,
 172                    buffer_handle_t handle)
 173 {
 174     // we're done with a software buffer. nothing to do in this
 175     // implementation. typically this is used to flush the data cache.
 176
 177     if (private_handle_t::validate(handle) < 0)
 178         return -EINVAL;
 179     return 0;
 180 }