1/*
2 *  ion.c
3 *
4 * Memory Allocator functions for ion
5 *
6 *   Copyright 2011 Google, Inc
7 *
8 *  Licensed under the Apache License, Version 2.0 (the "License");
9 *  you may not use this file except in compliance with the License.
10 *  You may obtain a copy of the License at
11 *
12 *      http://www.apache.org/licenses/LICENSE-2.0
13 *
14 *  Unless required by applicable law or agreed to in writing, software
15 *  distributed under the License is distributed on an "AS IS" BASIS,
16 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17 *  See the License for the specific language governing permissions and
18 *  limitations under the License.
19 */
20#include <errno.h>
21#include <fcntl.h>
22#include <stdio.h>
23#include <sys/ioctl.h>
24#include <sys/mman.h>
25#include <sys/types.h>
26
27#define LOG_TAG "ion"
28#include <cutils/log.h>
29
30#include "linux_ion.h"
31#include "omap_ion.h"
32#include "ion.h"
33
34int ion_open()
35{
36        int fd = open("/dev/ion", O_RDWR);
37        if (fd < 0)
38                ALOGE("open /dev/ion failed!\n");
39        return fd;
40}
41
42int ion_close(int fd)
43{
44        return close(fd);
45}
46
47static int ion_ioctl(int fd, int req, void *arg)
48{
49        int ret = ioctl(fd, req, arg);
50        if (ret < 0) {
51                ALOGE("ioctl %d failed with code %d: %s\n", req,
52                       ret, strerror(errno));
53                return -errno;
54        }
55        return ret;
56}
57
58int ion_alloc(int fd, size_t len, size_t align, unsigned int flags,
59              struct ion_handle **handle)
60{
61        int ret;
62        struct ion_allocation_data data = {
63                .len = len,
64                .align = align,
65                .flags = flags,
66        };
67
68        ret = ion_ioctl(fd, ION_IOC_ALLOC, &data);
69        if (ret < 0)
70                return ret;
71        *handle = data.handle;
72        return ret;
73}
74
75int ion_alloc_tiler(int fd, size_t w, size_t h, int fmt, unsigned int flags,
76            struct ion_handle **handle, size_t *stride)
77{
78        int ret;
79        struct omap_ion_tiler_alloc_data alloc_data = {
80                .w = w,
81                .h = h,
82                .fmt = fmt,
83                .flags = flags,
84        };
85
86        struct ion_custom_data custom_data = {
87                .cmd = OMAP_ION_TILER_ALLOC,
88                .arg = (unsigned long)(&alloc_data),
89        };
90
91        ret = ion_ioctl(fd, ION_IOC_CUSTOM, &custom_data);
92        if (ret < 0)
93                return ret;
94        *stride = alloc_data.stride;
95        *handle = alloc_data.handle;
96        return ret;
97}
98
99int ion_free(int fd, struct ion_handle *handle)
100{
101        struct ion_handle_data data = {
102                .handle = handle,
103        };
104        return ion_ioctl(fd, ION_IOC_FREE, &data);
105}
106
107int ion_map(int fd, struct ion_handle *handle, size_t length, int prot,
108            int flags, off_t offset, unsigned char **ptr, int *map_fd)
109{
110        struct ion_fd_data data = {
111                .handle = handle,
112        };
113        int ret = ion_ioctl(fd, ION_IOC_MAP, &data);
114        if (ret < 0)
115                return ret;
116        *map_fd = data.fd;
117        if (*map_fd < 0) {
118                ALOGE("map ioctl returned negative fd\n");
119                return -EINVAL;
120        }
121        *ptr = mmap(NULL, length, prot, flags, *map_fd, offset);
122        if (*ptr == MAP_FAILED) {
123                ALOGE("mmap failed: %s\n", strerror(errno));
124                return -errno;
125        }
126        return ret;
127}
128
129int ion_share(int fd, struct ion_handle *handle, int *share_fd)
130{
131        int map_fd;
132        struct ion_fd_data data = {
133                .handle = handle,
134        };
135        int ret = ion_ioctl(fd, ION_IOC_SHARE, &data);
136        if (ret < 0)
137                return ret;
138        *share_fd = data.fd;
139        if (*share_fd < 0) {
140                ALOGE("map ioctl returned negative fd\n");
141                return -EINVAL;
142        }
143        return ret;
144}
145
146int ion_import(int fd, int share_fd, struct ion_handle **handle)
147{
148        struct ion_fd_data data = {
149                .fd = share_fd,
150        };
151        int ret = ion_ioctl(fd, ION_IOC_IMPORT, &data);
152        if (ret < 0)
153                return ret;
154        *handle = data.handle;
155        return ret;
156}
157