/* * 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); }