root/tools/testing/selftests/drivers/dma-buf/udmabuf.c

DEFINITIONS

1. memfd_create
2. main

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <stdio.h>
   3 #include <stdlib.h>
   4 #include <unistd.h>
   5 #include <string.h>
   6 #include <errno.h>
   7 #include <linux/fcntl.h>
   8 #include <malloc.h>
   9 
  10 #include <sys/ioctl.h>
  11 #include <sys/syscall.h>
  12 #include <linux/memfd.h>
  13 #include <linux/udmabuf.h>
  14 
  15 #define TEST_PREFIX     "drivers/dma-buf/udmabuf"
  16 #define NUM_PAGES       4
  17 
  18 static int memfd_create(const char *name, unsigned int flags)
  19 {
  20         return syscall(__NR_memfd_create, name, flags);
  21 }
  22 
  23 int main(int argc, char *argv[])
  24 {
  25         struct udmabuf_create create;
  26         int devfd, memfd, buf, ret;
  27         off_t size;
  28         void *mem;
  29 
  30         devfd = open("/dev/udmabuf", O_RDWR);
  31         if (devfd < 0) {
  32                 printf("%s: [skip,no-udmabuf]\n", TEST_PREFIX);
  33                 exit(77);
  34         }
  35 
  36         memfd = memfd_create("udmabuf-test", MFD_ALLOW_SEALING);
  37         if (memfd < 0) {
  38                 printf("%s: [skip,no-memfd]\n", TEST_PREFIX);
  39                 exit(77);
  40         }
  41 
  42         ret = fcntl(memfd, F_ADD_SEALS, F_SEAL_SHRINK);
  43         if (ret < 0) {
  44                 printf("%s: [skip,fcntl-add-seals]\n", TEST_PREFIX);
  45                 exit(77);
  46         }
  47 
  48 
  49         size = getpagesize() * NUM_PAGES;
  50         ret = ftruncate(memfd, size);
  51         if (ret == -1) {
  52                 printf("%s: [FAIL,memfd-truncate]\n", TEST_PREFIX);
  53                 exit(1);
  54         }
  55 
  56         memset(&create, 0, sizeof(create));
  57 
  58         /* should fail (offset not page aligned) */
  59         create.memfd  = memfd;
  60         create.offset = getpagesize()/2;
  61         create.size   = getpagesize();
  62         buf = ioctl(devfd, UDMABUF_CREATE, &create);
  63         if (buf >= 0) {
  64                 printf("%s: [FAIL,test-1]\n", TEST_PREFIX);
  65                 exit(1);
  66         }
  67 
  68         /* should fail (size not multiple of page) */
  69         create.memfd  = memfd;
  70         create.offset = 0;
  71         create.size   = getpagesize()/2;
  72         buf = ioctl(devfd, UDMABUF_CREATE, &create);
  73         if (buf >= 0) {
  74                 printf("%s: [FAIL,test-2]\n", TEST_PREFIX);
  75                 exit(1);
  76         }
  77 
  78         /* should fail (not memfd) */
  79         create.memfd  = 0; /* stdin */
  80         create.offset = 0;
  81         create.size   = size;
  82         buf = ioctl(devfd, UDMABUF_CREATE, &create);
  83         if (buf >= 0) {
  84                 printf("%s: [FAIL,test-3]\n", TEST_PREFIX);
  85                 exit(1);
  86         }
  87 
  88         /* should work */
  89         create.memfd  = memfd;
  90         create.offset = 0;
  91         create.size   = size;
  92         buf = ioctl(devfd, UDMABUF_CREATE, &create);
  93         if (buf < 0) {
  94                 printf("%s: [FAIL,test-4]\n", TEST_PREFIX);
  95                 exit(1);
  96         }
  97 
  98         fprintf(stderr, "%s: ok\n", TEST_PREFIX);
  99         close(buf);
 100         close(memfd);
 101         close(devfd);
 102         return 0;
 103 }