afd9123946
This library contains helper functions for using ion Change-Id: I7d7f76d6d3f36cd94d67797a38099a94214392b1 Signed-off-by: Rebecca Schultz Zavin <rebecca@android.com>
134 lines
3.4 KiB
C
134 lines
3.4 KiB
C
/*
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* ion.c
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*
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* Memory Allocator functions for ion
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*
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* Copyright 2011 Google, Inc
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define LOG_TAG "ion"
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#include <cutils/log.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <sys/ioctl.h>
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#include <sys/mman.h>
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#include <sys/types.h>
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#include <linux/ion.h>
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#include <ion/ion.h>
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int ion_open()
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{
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int fd = open("/dev/ion", O_RDWR);
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if (fd < 0)
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ALOGE("open /dev/ion failed!\n");
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return fd;
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}
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int ion_close(int fd)
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{
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return close(fd);
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}
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static int ion_ioctl(int fd, int req, void *arg)
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{
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int ret = ioctl(fd, req, arg);
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if (ret < 0) {
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ALOGE("ioctl %x failed with code %d: %s\n", req,
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ret, strerror(errno));
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return -errno;
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}
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return ret;
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}
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int ion_alloc(int fd, size_t len, size_t align, unsigned int flags,
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struct ion_handle **handle)
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{
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int ret;
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struct ion_allocation_data data = {
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.len = len,
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.align = align,
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.flags = flags,
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};
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ret = ion_ioctl(fd, ION_IOC_ALLOC, &data);
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if (ret < 0)
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return ret;
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*handle = data.handle;
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return ret;
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}
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int ion_free(int fd, struct ion_handle *handle)
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{
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struct ion_handle_data data = {
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.handle = handle,
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};
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return ion_ioctl(fd, ION_IOC_FREE, &data);
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}
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int ion_map(int fd, struct ion_handle *handle, size_t length, int prot,
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int flags, off_t offset, unsigned char **ptr, int *map_fd)
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{
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struct ion_fd_data data = {
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.handle = handle,
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};
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int ret = ion_ioctl(fd, ION_IOC_MAP, &data);
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if (ret < 0)
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return ret;
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*map_fd = data.fd;
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if (*map_fd < 0) {
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ALOGE("map ioctl returned negative fd\n");
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return -EINVAL;
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}
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*ptr = mmap(NULL, length, prot, flags, *map_fd, offset);
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if (*ptr == MAP_FAILED) {
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ALOGE("mmap failed: %s\n", strerror(errno));
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return -errno;
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}
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return ret;
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}
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int ion_share(int fd, struct ion_handle *handle, int *share_fd)
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{
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int map_fd;
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struct ion_fd_data data = {
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.handle = handle,
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};
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int ret = ion_ioctl(fd, ION_IOC_SHARE, &data);
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if (ret < 0)
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return ret;
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*share_fd = data.fd;
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if (*share_fd < 0) {
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ALOGE("share ioctl returned negative fd\n");
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return -EINVAL;
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}
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return ret;
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}
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int ion_import(int fd, int share_fd, struct ion_handle **handle)
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{
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struct ion_fd_data data = {
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.fd = share_fd,
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};
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int ret = ion_ioctl(fd, ION_IOC_IMPORT, &data);
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if (ret < 0)
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return ret;
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*handle = data.handle;
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return ret;
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}
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