summaryrefslogtreecommitdiffstats
path: root/libion/ion.c
blob: 020c35bc419deaf881fd0bfdd4aa284c97d566c3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
/*
 *  ion.c
 *
 * Memory Allocator functions for ion
 *
 *   Copyright 2011 Google, Inc
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
#define LOG_TAG "ion"

#include <cutils/log.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/types.h>

#include <linux/ion.h>
#include <ion/ion.h>

int ion_open()
{
        int fd = open("/dev/ion", O_RDWR);
        if (fd < 0)
                ALOGE("open /dev/ion failed!\n");
        return fd;
}

int ion_close(int fd)
{
        return close(fd);
}

static int ion_ioctl(int fd, int req, void *arg)
{
        int ret = ioctl(fd, req, arg);
        if (ret < 0) {
                ALOGE("ioctl %x failed with code %d: %s\n", req,
                       ret, strerror(errno));
                return -errno;
        }
        return ret;
}

int ion_alloc(int fd, size_t len, size_t align, unsigned int heap_mask,
	      unsigned int flags, struct ion_handle **handle)
{
        int ret;
        struct ion_allocation_data data = {
                .len = len,
                .align = align,
		.heap_mask = heap_mask,
                .flags = flags,
        };

        ret = ion_ioctl(fd, ION_IOC_ALLOC, &data);
        if (ret < 0)
                return ret;
        *handle = data.handle;
        return ret;
}

int ion_free(int fd, struct ion_handle *handle)
{
        struct ion_handle_data data = {
                .handle = handle,
        };
        return ion_ioctl(fd, ION_IOC_FREE, &data);
}

int ion_map(int fd, struct ion_handle *handle, size_t length, int prot,
            int flags, off_t offset, unsigned char **ptr, int *map_fd)
{
        struct ion_fd_data data = {
                .handle = handle,
        };

        int ret = ion_ioctl(fd, ION_IOC_MAP, &data);
        if (ret < 0)
                return ret;
        *map_fd = data.fd;
        if (*map_fd < 0) {
                ALOGE("map ioctl returned negative fd\n");
                return -EINVAL;
        }
        *ptr = mmap(NULL, length, prot, flags, *map_fd, offset);
        if (*ptr == MAP_FAILED) {
                ALOGE("mmap failed: %s\n", strerror(errno));
                return -errno;
        }
        return ret;
}

int ion_share(int fd, struct ion_handle *handle, int *share_fd)
{
        int map_fd;
        struct ion_fd_data data = {
                .handle = handle,
        };

        int ret = ion_ioctl(fd, ION_IOC_SHARE, &data);
        if (ret < 0)
                return ret;
        *share_fd = data.fd;
        if (*share_fd < 0) {
                ALOGE("share ioctl returned negative fd\n");
                return -EINVAL;
        }
        return ret;
}

int ion_alloc_fd(int fd, size_t len, size_t align, unsigned int heap_mask,
		 unsigned int flags, int *handle_fd) {
	struct ion_handle *handle;
	int ret;

	ret = ion_alloc(fd, len, align, heap_mask, flags, &handle);
	if (ret < 0)
		return ret;
	ret = ion_share(fd, handle, handle_fd);
	ion_free(fd, handle);
	return ret;
}

int ion_import(int fd, int share_fd, struct ion_handle **handle)
{
        struct ion_fd_data data = {
                .fd = share_fd,
        };

        int ret = ion_ioctl(fd, ION_IOC_IMPORT, &data);
        if (ret < 0)
                return ret;
        *handle = data.handle;
        return ret;
}

int ion_sync_fd(int fd, int handle_fd)
{
    struct ion_fd_data data = {
        .fd = handle_fd,
    };
    return ion_ioctl(fd, ION_IOC_SYNC, &data);
}