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      1 /*
      2  *  ion.c
      3  *
      4  * Memory Allocator functions for ion
      5  *
      6  *   Copyright 2011 Google, Inc
      7  *
      8  *  Licensed under the Apache License, Version 2.0 (the "License");
      9  *  you may not use this file except in compliance with the License.
     10  *  You may obtain a copy of the License at
     11  *
     12  *      http://www.apache.org/licenses/LICENSE-2.0
     13  *
     14  *  Unless required by applicable law or agreed to in writing, software
     15  *  distributed under the License is distributed on an "AS IS" BASIS,
     16  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     17  *  See the License for the specific language governing permissions and
     18  *  limitations under the License.
     19  */
     20 #define LOG_TAG "ion"
     21 
     22 #include <errno.h>
     23 #include <fcntl.h>
     24 #include <linux/ion.h>
     25 #include <stdio.h>
     26 #include <string.h>
     27 #include <sys/ioctl.h>
     28 #include <sys/mman.h>
     29 #include <sys/types.h>
     30 #include <unistd.h>
     31 
     32 #include <ion/ion.h>
     33 #include <log/log.h>
     34 
     35 int ion_open()
     36 {
     37     int fd = open("/dev/ion", O_RDONLY | O_CLOEXEC);
     38     if (fd < 0)
     39         ALOGE("open /dev/ion failed!\n");
     40     return fd;
     41 }
     42 
     43 int ion_close(int fd)
     44 {
     45     int ret = close(fd);
     46     if (ret < 0)
     47         return -errno;
     48     return ret;
     49 }
     50 
     51 static int ion_ioctl(int fd, int req, void *arg)
     52 {
     53     int ret = ioctl(fd, req, arg);
     54     if (ret < 0) {
     55         ALOGE("ioctl %x failed with code %d: %s\n", req,
     56               ret, strerror(errno));
     57         return -errno;
     58     }
     59     return ret;
     60 }
     61 
     62 int ion_alloc(int fd, size_t len, size_t align, unsigned int heap_mask,
     63               unsigned int flags, ion_user_handle_t *handle)
     64 {
     65     int ret;
     66     struct ion_allocation_data data = {
     67         .len = len,
     68         .align = align,
     69         .heap_id_mask = heap_mask,
     70         .flags = flags,
     71     };
     72 
     73     if (handle == NULL)
     74         return -EINVAL;
     75 
     76     ret = ion_ioctl(fd, ION_IOC_ALLOC, &data);
     77     if (ret < 0)
     78         return ret;
     79     *handle = data.handle;
     80     return ret;
     81 }
     82 
     83 int ion_free(int fd, ion_user_handle_t handle)
     84 {
     85     struct ion_handle_data data = {
     86         .handle = handle,
     87     };
     88     return ion_ioctl(fd, ION_IOC_FREE, &data);
     89 }
     90 
     91 int ion_map(int fd, ion_user_handle_t handle, size_t length, int prot,
     92             int flags, off_t offset, unsigned char **ptr, int *map_fd)
     93 {
     94     int ret;
     95     unsigned char *tmp_ptr;
     96     struct ion_fd_data data = {
     97         .handle = handle,
     98     };
     99 
    100     if (map_fd == NULL)
    101         return -EINVAL;
    102     if (ptr == NULL)
    103         return -EINVAL;
    104 
    105     ret = ion_ioctl(fd, ION_IOC_MAP, &data);
    106     if (ret < 0)
    107         return ret;
    108     if (data.fd < 0) {
    109         ALOGE("map ioctl returned negative fd\n");
    110         return -EINVAL;
    111     }
    112     tmp_ptr = mmap(NULL, length, prot, flags, data.fd, offset);
    113     if (tmp_ptr == MAP_FAILED) {
    114         ALOGE("mmap failed: %s\n", strerror(errno));
    115         return -errno;
    116     }
    117     *map_fd = data.fd;
    118     *ptr = tmp_ptr;
    119     return ret;
    120 }
    121 
    122 int ion_share(int fd, ion_user_handle_t handle, int *share_fd)
    123 {
    124     int ret;
    125     struct ion_fd_data data = {
    126         .handle = handle,
    127     };
    128 
    129     if (share_fd == NULL)
    130         return -EINVAL;
    131 
    132     ret = ion_ioctl(fd, ION_IOC_SHARE, &data);
    133     if (ret < 0)
    134         return ret;
    135     if (data.fd < 0) {
    136         ALOGE("share ioctl returned negative fd\n");
    137         return -EINVAL;
    138     }
    139     *share_fd = data.fd;
    140     return ret;
    141 }
    142 
    143 int ion_alloc_fd(int fd, size_t len, size_t align, unsigned int heap_mask,
    144                  unsigned int flags, int *handle_fd) {
    145     ion_user_handle_t handle;
    146     int ret;
    147 
    148     ret = ion_alloc(fd, len, align, heap_mask, flags, &handle);
    149     if (ret < 0)
    150         return ret;
    151     ret = ion_share(fd, handle, handle_fd);
    152     ion_free(fd, handle);
    153     return ret;
    154 }
    155 
    156 int ion_import(int fd, int share_fd, ion_user_handle_t *handle)
    157 {
    158     int ret;
    159     struct ion_fd_data data = {
    160         .fd = share_fd,
    161     };
    162 
    163     if (handle == NULL)
    164         return -EINVAL;
    165 
    166     ret = ion_ioctl(fd, ION_IOC_IMPORT, &data);
    167     if (ret < 0)
    168         return ret;
    169     *handle = data.handle;
    170     return ret;
    171 }
    172 
    173 int ion_sync_fd(int fd, int handle_fd)
    174 {
    175     struct ion_fd_data data = {
    176         .fd = handle_fd,
    177     };
    178     return ion_ioctl(fd, ION_IOC_SYNC, &data);
    179 }
    180