blob: 1f5cf8f61d0fda51456541db4a64a05ff0d5f9c3 [file] [log] [blame]
Rebecca Schultz Zavin2480ecc2012-08-14 16:08:04 -07001/*
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
40static 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
56static 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
75int grallocMap(gralloc_module_t const* module, private_handle_t *hnd)
76{
77 return gralloc_map(module, hnd);
78}
79
80int grallocUnmap(gralloc_module_t const* module, private_handle_t *hnd)
81{
82 return gralloc_unmap(module, hnd);
83}
84
85static pthread_mutex_t sMapLock = PTHREAD_MUTEX_INITIALIZER;
86
87/*****************************************************************************/
88
89int gralloc_register_buffer(gralloc_module_t const* module,
90 buffer_handle_t handle)
91{
92 int err;
93 if (private_handle_t::validate(handle) < 0)
94 return -EINVAL;
95
96 err = gralloc_map(module, handle);
97
98 private_handle_t* hnd = (private_handle_t*)handle;
99 ALOGV("%s: base %p %d %d %d %d\n", __func__, hnd->base, hnd->size,
100 hnd->width, hnd->height, hnd->stride);
101 return err;
102}
103
104int gralloc_unregister_buffer(gralloc_module_t const* module,
105 buffer_handle_t handle)
106{
107 if (private_handle_t::validate(handle) < 0)
108 return -EINVAL;
109
110 private_handle_t* hnd = (private_handle_t*)handle;
111 ALOGV("%s: base %p %d %d %d %d\n", __func__, hnd->base, hnd->size,
112 hnd->width, hnd->height, hnd->stride);
113
114 gralloc_unmap(module, handle);
115
116 return 0;
117}
118
119int gralloc_lock(gralloc_module_t const* module,
120 buffer_handle_t handle, int usage,
121 int l, int t, int w, int h,
122 void** vaddr)
123{
124 // this is called when a buffer is being locked for software
125 // access. in thin implementation we have nothing to do since
126 // not synchronization with the h/w is needed.
127 // typically this is used to wait for the h/w to finish with
128 // this buffer if relevant. the data cache may need to be
129 // flushed or invalidated depending on the usage bits and the
130 // hardware.
131
132 if (private_handle_t::validate(handle) < 0)
133 return -EINVAL;
134
135 private_handle_t* hnd = (private_handle_t*)handle;
136 *vaddr = (void*)hnd->base;
137 return 0;
138}
139
140int gralloc_unlock(gralloc_module_t const* module,
141 buffer_handle_t handle)
142{
143 // we're done with a software buffer. nothing to do in this
144 // implementation. typically this is used to flush the data cache.
145
146 if (private_handle_t::validate(handle) < 0)
147 return -EINVAL;
148 return 0;
149}