media_device_test.c

  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
 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		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}