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#define LOG_TAG "ion"
21
22#include <cutils/log.h>
23#include <errno.h>
24#include <fcntl.h>
25#include <stdio.h>
26#include <sys/ioctl.h>
27#include <sys/mman.h>
28#include <sys/types.h>
29
30#include <linux/ion.h>
31#include <ion/ion.h>
32
33int ion_open()
34{
35        int fd = open("/dev/ion", O_RDWR);
36        if (fd < 0)
37                ALOGE("open /dev/ion failed!\n");
38        return fd;
39}
40
41int ion_close(int fd)
42{
43        return close(fd);
44}
45
46static int ion_ioctl(int fd, int req, void *arg)
47{
48        int ret = ioctl(fd, req, arg);
49        if (ret < 0) {
50                ALOGE("ioctl %x failed with code %d: %s\n", req,
51                       ret, strerror(errno));
52                return -errno;
53        }
54        return ret;
55}
56
57int ion_alloc(int fd, size_t len, size_t align, unsigned int heap_mask,
58	      unsigned int flags, struct ion_handle **handle)
59{
60        int ret;
61        struct ion_allocation_data data = {
62                .len = len,
63                .align = align,
64		.heap_mask = heap_mask,
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_free(int fd, struct ion_handle *handle)
76{
77        struct ion_handle_data data = {
78                .handle = handle,
79        };
80        return ion_ioctl(fd, ION_IOC_FREE, &data);
81}
82
83int ion_map(int fd, struct ion_handle *handle, size_t length, int prot,
84            int flags, off_t offset, unsigned char **ptr, int *map_fd)
85{
86        struct ion_fd_data data = {
87                .handle = handle,
88        };
89
90        int ret = ion_ioctl(fd, ION_IOC_MAP, &data);
91        if (ret < 0)
92                return ret;
93        *map_fd = data.fd;
94        if (*map_fd < 0) {
95                ALOGE("map ioctl returned negative fd\n");
96                return -EINVAL;
97        }
98        *ptr = mmap(NULL, length, prot, flags, *map_fd, offset);
99        if (*ptr == MAP_FAILED) {
100                ALOGE("mmap failed: %s\n", strerror(errno));
101                return -errno;
102        }
103        return ret;
104}
105
106int ion_share(int fd, struct ion_handle *handle, int *share_fd)
107{
108        int map_fd;
109        struct ion_fd_data data = {
110                .handle = handle,
111        };
112
113        int ret = ion_ioctl(fd, ION_IOC_SHARE, &data);
114        if (ret < 0)
115                return ret;
116        *share_fd = data.fd;
117        if (*share_fd < 0) {
118                ALOGE("share ioctl returned negative fd\n");
119                return -EINVAL;
120        }
121        return ret;
122}
123
124int ion_alloc_fd(int fd, size_t len, size_t align, unsigned int heap_mask,
125		 unsigned int flags, int *handle_fd) {
126	struct ion_handle *handle;
127	int ret;
128
129	ret = ion_alloc(fd, len, align, heap_mask, flags, &handle);
130	if (ret < 0)
131		return ret;
132	ret = ion_share(fd, handle, handle_fd);
133	ion_free(fd, handle);
134	return ret;
135}
136
137int ion_import(int fd, int share_fd, struct ion_handle **handle)
138{
139        struct ion_fd_data data = {
140                .fd = share_fd,
141        };
142
143        int ret = ion_ioctl(fd, ION_IOC_IMPORT, &data);
144        if (ret < 0)
145                return ret;
146        *handle = data.handle;
147        return ret;
148}
149
150int ion_sync_fd(int fd, int handle_fd)
151{
152    struct ion_fd_data data = {
153        .fd = handle_fd,
154    };
155    return ion_ioctl(fd, ION_IOC_SYNC, &data);
156}
157