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/*
* 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 <string.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)
{
int ret = close(fd);
if (ret < 0)
return -errno;
return ret;
}
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, ion_user_handle_t *handle)
{
int ret;
struct ion_allocation_data data = {
.len = len,
.align = align,
.heap_id_mask = heap_mask,
.flags = flags,
};
if (handle == NULL)
return -EINVAL;
ret = ion_ioctl(fd, ION_IOC_ALLOC, &data);
if (ret < 0)
return ret;
*handle = data.handle;
return ret;
}
int ion_free(int fd, ion_user_handle_t handle)
{
struct ion_handle_data data = {
.handle = handle,
};
return ion_ioctl(fd, ION_IOC_FREE, &data);
}
int ion_map(int fd, ion_user_handle_t handle, size_t length, int prot,
int flags, off_t offset, unsigned char **ptr, int *map_fd)
{
int ret;
unsigned char *tmp_ptr;
struct ion_fd_data data = {
.handle = handle,
};
if (map_fd == NULL)
return -EINVAL;
if (ptr == NULL)
return -EINVAL;
ret = ion_ioctl(fd, ION_IOC_MAP, &data);
if (ret < 0)
return ret;
if (data.fd < 0) {
ALOGE("map ioctl returned negative fd\n");
return -EINVAL;
}
tmp_ptr = mmap(NULL, length, prot, flags, data.fd, offset);
if (tmp_ptr == MAP_FAILED) {
ALOGE("mmap failed: %s\n", strerror(errno));
return -errno;
}
*map_fd = data.fd;
*ptr = tmp_ptr;
return ret;
}
int ion_share(int fd, ion_user_handle_t handle, int *share_fd)
{
int ret;
struct ion_fd_data data = {
.handle = handle,
};
if (share_fd == NULL)
return -EINVAL;
ret = ion_ioctl(fd, ION_IOC_SHARE, &data);
if (ret < 0)
return ret;
if (data.fd < 0) {
ALOGE("share ioctl returned negative fd\n");
return -EINVAL;
}
*share_fd = data.fd;
return ret;
}
int ion_alloc_fd(int fd, size_t len, size_t align, unsigned int heap_mask,
unsigned int flags, int *handle_fd) {
ion_user_handle_t 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, ion_user_handle_t *handle)
{
int ret;
struct ion_fd_data data = {
.fd = share_fd,
};
if (handle == NULL)
return -EINVAL;
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);
}
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