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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 <cutils/log.h>
     23 #include <errno.h>
     24 #include <fcntl.h>
     25 #include <stdio.h>
     26 #include <sys/ioctl.h>
     27 #include <sys/mman.h>
     28 #include <sys/types.h>
     29 
     30 #include <linux/ion.h>
     31 #include <ion/ion.h>
     32 
     33 int ion_open()
     34 {
     35         int fd = open("/dev/ion", O_RDWR);
     36         if (fd < 0)
     37                 ALOGE("open /dev/ion failed!\n");
     38         return fd;
     39 }
     40 
     41 int ion_close(int fd)
     42 {
     43         return close(fd);
     44 }
     45 
     46 static int ion_ioctl(int fd, int req, void *arg)
     47 {
     48         int ret = ioctl(fd, req, arg);
     49         if (ret < 0) {
     50                 ALOGE("ioctl %x failed with code %d: %s\n", req,
     51                        ret, strerror(errno));
     52                 return -errno;
     53         }
     54         return ret;
     55 }
     56 
     57 int ion_alloc(int fd, size_t len, size_t align, unsigned int heap_mask,
     58 	      unsigned int flags, struct ion_handle **handle)
     59 {
     60         int ret;
     61         struct ion_allocation_data data = {
     62                 .len = len,
     63                 .align = align,
     64 		.heap_mask = heap_mask,
     65                 .flags = flags,
     66         };
     67 
     68         ret = ion_ioctl(fd, ION_IOC_ALLOC, &data);
     69         if (ret < 0)
     70                 return ret;
     71         *handle = data.handle;
     72         return ret;
     73 }
     74 
     75 int ion_free(int fd, struct ion_handle *handle)
     76 {
     77         struct ion_handle_data data = {
     78                 .handle = handle,
     79         };
     80         return ion_ioctl(fd, ION_IOC_FREE, &data);
     81 }
     82 
     83 int ion_map(int fd, struct ion_handle *handle, size_t length, int prot,
     84             int flags, off_t offset, unsigned char **ptr, int *map_fd)
     85 {
     86         struct ion_fd_data data = {
     87                 .handle = handle,
     88         };
     89 
     90         int ret = ion_ioctl(fd, ION_IOC_MAP, &data);
     91         if (ret < 0)
     92                 return ret;
     93         *map_fd = data.fd;
     94         if (*map_fd < 0) {
     95                 ALOGE("map ioctl returned negative fd\n");
     96                 return -EINVAL;
     97         }
     98         *ptr = mmap(NULL, length, prot, flags, *map_fd, offset);
     99         if (*ptr == MAP_FAILED) {
    100                 ALOGE("mmap failed: %s\n", strerror(errno));
    101                 return -errno;
    102         }
    103         return ret;
    104 }
    105 
    106 int ion_share(int fd, struct ion_handle *handle, int *share_fd)
    107 {
    108         int map_fd;
    109         struct ion_fd_data data = {
    110                 .handle = handle,
    111         };
    112 
    113         int ret = ion_ioctl(fd, ION_IOC_SHARE, &data);
    114         if (ret < 0)
    115                 return ret;
    116         *share_fd = data.fd;
    117         if (*share_fd < 0) {
    118                 ALOGE("share ioctl returned negative fd\n");
    119                 return -EINVAL;
    120         }
    121         return ret;
    122 }
    123 
    124 int ion_alloc_fd(int fd, size_t len, size_t align, unsigned int heap_mask,
    125 		 unsigned int flags, int *handle_fd) {
    126 	struct ion_handle *handle;
    127 	int ret;
    128 
    129 	ret = ion_alloc(fd, len, align, heap_mask, flags, &handle);
    130 	if (ret < 0)
    131 		return ret;
    132 	ret = ion_share(fd, handle, handle_fd);
    133 	ion_free(fd, handle);
    134 	return ret;
    135 }
    136 
    137 int ion_import(int fd, int share_fd, struct ion_handle **handle)
    138 {
    139         struct ion_fd_data data = {
    140                 .fd = share_fd,
    141         };
    142 
    143         int ret = ion_ioctl(fd, ION_IOC_IMPORT, &data);
    144         if (ret < 0)
    145                 return ret;
    146         *handle = data.handle;
    147         return ret;
    148 }
    149 
    150 int ion_sync_fd(int fd, int handle_fd)
    151 {
    152     struct ion_fd_data data = {
    153         .fd = handle_fd,
    154     };
    155     return ion_ioctl(fd, ION_IOC_SYNC, &data);
    156 }
    157