1 | // SPDX-License-Identifier: GPL-2.0 |
2 | |
3 | /* |
4 | * media_device_test.c - Media Controller Device ioctl loop Test |
5 | * |
6 | * Copyright (c) 2016 Shuah Khan <shuahkh@osg.samsung.com> |
7 | * Copyright (c) 2016 Samsung Electronics Co., Ltd. |
8 | * |
9 | */ |
10 | |
11 | /* |
12 | * This file adds a test for Media Controller API. |
13 | * This test should be run as root and should not be |
14 | * included in the Kselftest run. This test should be |
15 | * run when hardware and driver that makes use Media |
16 | * Controller API are present in the system. |
17 | * |
18 | * This test opens user specified Media Device and calls |
19 | * MEDIA_IOC_DEVICE_INFO ioctl in a loop once every 10 |
20 | * seconds. |
21 | * |
22 | * Usage: |
23 | * sudo ./media_device_test -d /dev/mediaX |
24 | * |
25 | * While test is running, remove the device and |
26 | * ensure there are no use after free errors and |
27 | * other Oops in the dmesg. Enable KaSan kernel |
28 | * config option for use-after-free error detection. |
29 | */ |
30 | |
31 | #include <stdio.h> |
32 | #include <unistd.h> |
33 | #include <stdlib.h> |
34 | #include <errno.h> |
35 | #include <string.h> |
36 | #include <fcntl.h> |
37 | #include <sys/ioctl.h> |
38 | #include <sys/stat.h> |
39 | #include <time.h> |
40 | #include <linux/media.h> |
41 | |
42 | #include "../kselftest.h" |
43 | |
44 | int main(int argc, char **argv) |
45 | { |
46 | int opt; |
47 | char media_device[256]; |
48 | int count; |
49 | struct media_device_info mdi; |
50 | int ret; |
51 | int fd; |
52 | |
53 | if (argc < 2) { |
54 | printf("Usage: %s [-d </dev/mediaX>]\n" , argv[0]); |
55 | exit(-1); |
56 | } |
57 | |
58 | /* Process arguments */ |
59 | while ((opt = getopt(argc, argv, "d:" )) != -1) { |
60 | switch (opt) { |
61 | case 'd': |
62 | strncpy(media_device, optarg, sizeof(media_device) - 1); |
63 | media_device[sizeof(media_device)-1] = '\0'; |
64 | break; |
65 | default: |
66 | printf("Usage: %s [-d </dev/mediaX>]\n" , argv[0]); |
67 | exit(-1); |
68 | } |
69 | } |
70 | |
71 | if (getuid() != 0) |
72 | ksft_exit_skip(msg: "Please run the test as root - Exiting.\n" ); |
73 | |
74 | /* Generate random number of interations */ |
75 | srand((unsigned int) time(NULL)); |
76 | count = rand(); |
77 | |
78 | /* Open Media device and keep it open */ |
79 | fd = open(media_device, O_RDWR); |
80 | if (fd == -1) { |
81 | printf("Media Device open errno %s\n" , strerror(errno)); |
82 | exit(-1); |
83 | } |
84 | |
85 | printf("\nNote:\n" |
86 | "While test is running, remove the device and\n" |
87 | "ensure there are no use after free errors and\n" |
88 | "other Oops in the dmesg. Enable KaSan kernel\n" |
89 | "config option for use-after-free error detection.\n\n" ); |
90 | |
91 | printf("Running test for %d iterations\n" , count); |
92 | |
93 | while (count > 0) { |
94 | ret = ioctl(fd, MEDIA_IOC_DEVICE_INFO, &mdi); |
95 | if (ret < 0) |
96 | printf("Media Device Info errno %s\n" , strerror(errno)); |
97 | else |
98 | printf("Media device model %s driver %s - count %d\n" , |
99 | mdi.model, mdi.driver, count); |
100 | sleep(10); |
101 | count--; |
102 | } |
103 | } |
104 | |