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1// SPDX-License-Identifier: GPL-2.02 3/*4 * media_device_test.c - Media Controller Device ioctl loop Test5 *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 be14 * included in the Kselftest run. This test should be15 * run when hardware and driver that makes use Media16 * Controller API are present in the system.17 *18 * This test opens user specified Media Device and calls19 * MEDIA_IOC_DEVICE_INFO ioctl in a loop once every 1020 * seconds.21 *22 * Usage:23 * sudo ./media_device_test -d /dev/mediaX24 *25 * While test is running, remove the device and26 * ensure there are no use after free errors and27 * other Oops in the dmesg. Enable KaSan kernel28 * 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 44int 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("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 else98 printf("Media device model %s driver %s - count %d\n",99 mdi.model, mdi.driver, count);100 sleep(10);101 count--;102 }103}104