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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media_device_open.c (1922B)

      1// SPDX-License-Identifier: GPL-2.0
      2
      3/*
      4 * media_device_open.c - Media Controller Device Open 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, closes the file, and exits.
     20 *
     21 * Usage:
     22 *	sudo ./media_device_open -d /dev/mediaX
     23 *
     24 *	Run this test is a loop and run bind/unbind on the driver.
     25*/
     26
     27#include <stdio.h>
     28#include <unistd.h>
     29#include <stdlib.h>
     30#include <errno.h>
     31#include <string.h>
     32#include <fcntl.h>
     33#include <sys/ioctl.h>
     34#include <sys/stat.h>
     35#include <linux/media.h>
     36
     37#include "../kselftest.h"
     38
     39int main(int argc, char **argv)
     40{
     41	int opt;
     42	char media_device[256];
     43	int count = 0;
     44	struct media_device_info mdi;
     45	int ret;
     46	int fd;
     47
     48	if (argc < 2) {
     49		printf("Usage: %s [-d </dev/mediaX>]\n", argv[0]);
     50		exit(-1);
     51	}
     52
     53	/* Process arguments */
     54	while ((opt = getopt(argc, argv, "d:")) != -1) {
     55		switch (opt) {
     56		case 'd':
     57			strncpy(media_device, optarg, sizeof(media_device) - 1);
     58			media_device[sizeof(media_device)-1] = '\0';
     59			break;
     60		default:
     61			printf("Usage: %s [-d </dev/mediaX>]\n", argv[0]);
     62			exit(-1);
     63		}
     64	}
     65
     66	if (getuid() != 0)
     67		ksft_exit_skip("Please run the test as root - Exiting.\n");
     68
     69	/* Open Media device and keep it open */
     70	fd = open(media_device, O_RDWR);
     71	if (fd == -1) {
     72		printf("Media Device open errno %s\n", strerror(errno));
     73		exit(-1);
     74	}
     75
     76	ret = ioctl(fd, MEDIA_IOC_DEVICE_INFO, &mdi);
     77	if (ret < 0)
     78		printf("Media Device Info errno %s\n", strerror(errno));
     79	else
     80		printf("Media device model %s driver %s\n",
     81			mdi.model, mdi.driver);
     82}