cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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video_device_test.c (2559B)

      1// SPDX-License-Identifier: GPL-2.0
      2
      3/*
      4 * video_device_test - Video Device 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 Video Device. This test should not be included
     13 * in the Kselftest run. This test should be run when hardware and driver
     14 * that makes use of V4L2 API is present.
     15 *
     16 * This test opens user specified Video Device and calls video ioctls in a
     17 * loop once every 10 seconds.
     18 *
     19 * Usage:
     20 *	sudo ./video_device_test -d /dev/videoX
     21 *
     22 *	While test is running, remove the device or unbind the driver and
     23 *	ensure there are no use after free errors and other Oops in the
     24 *	dmesg.
     25 *	When possible, enable KaSan kernel config option for use-after-free
     26 *	error detection.
     27*/
     28
     29#include <stdio.h>
     30#include <unistd.h>
     31#include <stdlib.h>
     32#include <errno.h>
     33#include <string.h>
     34#include <fcntl.h>
     35#include <sys/ioctl.h>
     36#include <sys/stat.h>
     37#include <time.h>
     38#include <linux/videodev2.h>
     39
     40int main(int argc, char **argv)
     41{
     42	int opt;
     43	char video_dev[256];
     44	int count;
     45	struct v4l2_tuner vtuner;
     46	struct v4l2_capability vcap;
     47	int ret;
     48	int fd;
     49
     50	if (argc < 2) {
     51		printf("Usage: %s [-d </dev/videoX>]\n", argv[0]);
     52		exit(-1);
     53	}
     54
     55	/* Process arguments */
     56	while ((opt = getopt(argc, argv, "d:")) != -1) {
     57		switch (opt) {
     58		case 'd':
     59			strncpy(video_dev, optarg, sizeof(video_dev) - 1);
     60			video_dev[sizeof(video_dev)-1] = '\0';
     61			break;
     62		default:
     63			printf("Usage: %s [-d </dev/videoX>]\n", argv[0]);
     64			exit(-1);
     65		}
     66	}
     67
     68	/* Generate random number of interations */
     69	srand((unsigned int) time(NULL));
     70	count = rand();
     71
     72	/* Open Video device and keep it open */
     73	fd = open(video_dev, O_RDWR);
     74	if (fd == -1) {
     75		printf("Video Device open errno %s\n", strerror(errno));
     76		exit(-1);
     77	}
     78
     79	printf("\nNote:\n"
     80	       "While test is running, remove the device or unbind\n"
     81	       "driver and ensure there are no use after free errors\n"
     82	       "and other Oops in the dmesg. When possible, enable KaSan\n"
     83	       "kernel config option for use-after-free error detection.\n\n");
     84
     85	while (count > 0) {
     86		ret = ioctl(fd, VIDIOC_QUERYCAP, &vcap);
     87		if (ret < 0)
     88			printf("VIDIOC_QUERYCAP errno %s\n", strerror(errno));
     89		else
     90			printf("Video device driver %s\n", vcap.driver);
     91
     92		ret = ioctl(fd, VIDIOC_G_TUNER, &vtuner);
     93		if (ret < 0)
     94			printf("VIDIOC_G_TUNER, errno %s\n", strerror(errno));
     95		else
     96			printf("type %d rangelow %d rangehigh %d\n",
     97				vtuner.type, vtuner.rangelow, vtuner.rangehigh);
     98		sleep(10);
     99		count--;
    100	}
    101}