242 lines
6.2 KiB
C
242 lines
6.2 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 <errno.h>
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#include <fcntl.h>
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#include <linux/ion.h>
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#include <stdatomic.h>
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#include <stdio.h>
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#include <string.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 <unistd.h>
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#include <ion/ion.h>
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#include <linux/ion_4.19.h>
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#include <log/log.h>
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#define ION_ABI_VERSION_MODULAR_HEAPS 2
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enum ion_version { ION_VERSION_UNKNOWN, ION_VERSION_MODERN, ION_VERSION_LEGACY };
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static atomic_int g_ion_version = ATOMIC_VAR_INIT(ION_VERSION_UNKNOWN);
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int ion_is_legacy(int fd) {
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int version = atomic_load_explicit(&g_ion_version, memory_order_acquire);
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if (version == ION_VERSION_UNKNOWN) {
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/**
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* Check for FREE IOCTL here; it is available only in the old
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* kernels, not the new ones.
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*/
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int err = ion_free(fd, (ion_user_handle_t)0);
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version = (err == -ENOTTY) ? ION_VERSION_MODERN : ION_VERSION_LEGACY;
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atomic_store_explicit(&g_ion_version, version, memory_order_release);
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}
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return version == ION_VERSION_LEGACY;
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}
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int ion_open() {
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int fd = open("/dev/ion", O_RDONLY | O_CLOEXEC);
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if (fd < 0) ALOGE("open /dev/ion failed: %s", strerror(errno));
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return fd;
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}
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int ion_close(int fd) {
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int ret = close(fd);
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if (ret < 0) return -errno;
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return ret;
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}
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static int ion_ioctl(int fd, int req, void* arg) {
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int ret = ioctl(fd, req, arg);
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if (ret < 0) {
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/*
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* To avoid confusion, do not print an error log if the error came from
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* issuing an unimplemented IOCTL. Various versions of ION do not
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* support several IOCTLs and they are issued to check which ION version
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* the device supports.
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*/
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if (errno != ENOTTY)
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ALOGE("ioctl %x failed with code %d: %s", req, 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_is_using_modular_heaps(int fd) {
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int ion_abi_version = 0;
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int ret = 0;
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ret = ion_ioctl(fd, ION_IOC_ABI_VERSION, &ion_abi_version);
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return (ret == 0 && ion_abi_version >= ION_ABI_VERSION_MODULAR_HEAPS);
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}
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int ion_alloc(int fd, size_t len, size_t align, unsigned int heap_mask, unsigned int flags,
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ion_user_handle_t* handle) {
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int ret = 0;
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if ((handle == NULL) || (!ion_is_legacy(fd))) return -EINVAL;
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struct ion_allocation_data data = {
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.len = len, .align = align, .heap_id_mask = heap_mask, .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) 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, ion_user_handle_t handle) {
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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, ion_user_handle_t handle, size_t length, int prot, int flags, off_t offset,
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unsigned char** ptr, int* map_fd) {
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if (!ion_is_legacy(fd)) return -EINVAL;
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int ret;
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unsigned char* tmp_ptr;
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struct ion_fd_data data = {
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.handle = handle,
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};
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if (map_fd == NULL) return -EINVAL;
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if (ptr == NULL) return -EINVAL;
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ret = ion_ioctl(fd, ION_IOC_MAP, &data);
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if (ret < 0) return ret;
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if (data.fd < 0) {
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ALOGE("map ioctl returned negative fd");
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return -EINVAL;
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}
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tmp_ptr = mmap(NULL, length, prot, flags, data.fd, offset);
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if (tmp_ptr == MAP_FAILED) {
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ALOGE("mmap failed: %s", strerror(errno));
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return -errno;
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}
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*map_fd = data.fd;
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*ptr = tmp_ptr;
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return ret;
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}
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int ion_share(int fd, ion_user_handle_t handle, int* share_fd) {
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int ret;
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struct ion_fd_data data = {
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.handle = handle,
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};
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if (!ion_is_legacy(fd)) return -EINVAL;
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if (share_fd == NULL) return -EINVAL;
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ret = ion_ioctl(fd, ION_IOC_SHARE, &data);
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if (ret < 0) return ret;
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if (data.fd < 0) {
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ALOGE("share ioctl returned negative fd");
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return -EINVAL;
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}
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*share_fd = data.fd;
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return ret;
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}
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int ion_alloc_fd(int fd, size_t len, size_t align, unsigned int heap_mask, unsigned int flags,
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int* handle_fd) {
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ion_user_handle_t handle;
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int ret;
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if (!handle_fd) return -EINVAL;
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if (!ion_is_legacy(fd)) {
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struct ion_new_allocation_data data = {
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.len = len,
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.heap_id_mask = heap_mask,
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.flags = flags,
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};
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ret = ion_ioctl(fd, ION_IOC_NEW_ALLOC, &data);
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if (ret < 0) return ret;
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*handle_fd = data.fd;
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} else {
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ret = ion_alloc(fd, len, align, heap_mask, flags, &handle);
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if (ret < 0) return ret;
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ret = ion_share(fd, handle, handle_fd);
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ion_free(fd, handle);
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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, ion_user_handle_t* handle) {
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int ret;
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struct ion_fd_data data = {
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.fd = share_fd,
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};
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if (!ion_is_legacy(fd)) return -EINVAL;
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if (handle == NULL) return -EINVAL;
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ret = ion_ioctl(fd, ION_IOC_IMPORT, &data);
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if (ret < 0) 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_sync_fd(int fd, int handle_fd) {
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struct ion_fd_data data = {
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.fd = handle_fd,
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};
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if (!ion_is_legacy(fd)) return -EINVAL;
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return ion_ioctl(fd, ION_IOC_SYNC, &data);
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}
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int ion_query_heap_cnt(int fd, int* cnt) {
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int ret;
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struct ion_heap_query query;
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if (!cnt) return -EINVAL;
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memset(&query, 0, sizeof(query));
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ret = ion_ioctl(fd, ION_IOC_HEAP_QUERY, &query);
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if (ret < 0) return ret;
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*cnt = query.cnt;
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return ret;
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}
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int ion_query_get_heaps(int fd, int cnt, void* buffers) {
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int ret;
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struct ion_heap_query query = {
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.cnt = cnt, .heaps = (uintptr_t)buffers,
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};
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ret = ion_ioctl(fd, ION_IOC_HEAP_QUERY, &query);
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return ret;
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}
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