selftests: add a new test for Media Controller API

media_device_test

TEST_PROGS := media_device_test

all: $(TEST_PROGS)

include ../lib.mk

clean:

	rm -fr media_device_test

/*

 * media_devkref_test.c - Media Controller Device Kref API Test

 *

 * Copyright (c) 2016 Shuah Khan <shuahkh@osg.samsung.com>

 * Copyright (c) 2016 Samsung Electronics Co., Ltd.

 *

 * This file is released under the GPLv2.

 */

/*

 * This file adds a test for Media Controller API.

 * This test should be run as root and should not be

 * included in the Kselftest run. This test should be

 * run when hardware and driver that makes use Media

 * Controller API are present in the system.

 *

 * This test opens user specified Media Device and calls

 * MEDIA_IOC_DEVICE_INFO ioctl in a loop once every 10

 * seconds.

 *

 * Usage:

 *	sudo ./media_devkref_test -d /dev/mediaX

 *

 *	While test is running, remove the device and

 *	ensure there are no use after free errors and

 *	other Oops in the dmesg. Enable KaSan kernel

 *	config option for use-after-free error detection.

*/

#include <stdio.h>

#include <unistd.h>

#include <stdlib.h>

#include <errno.h>

#include <string.h>

#include <fcntl.h>

#include <sys/ioctl.h>

#include <sys/stat.h>

#include <linux/media.h>

int main(int argc, char **argv)

{

	int opt;

	char media_device[256];

	int count = 0;

	struct media_device_info mdi;

	int ret;

	int fd;

	if (argc < 2) {

		printf("Usage: %s [-d </dev/mediaX>]\n", argv[0]);

		exit(-1);

	}

	/* Process arguments */

	while ((opt = getopt(argc, argv, "d:")) != -1) {

		switch (opt) {

		case 'd':

			strncpy(media_device, optarg, sizeof(media_device) - 1);

			media_device[sizeof(media_device)-1] = '\0';

			break;

		default:

			printf("Usage: %s [-d </dev/mediaX>]\n", argv[0]);

			exit(-1);

		}

	}

	if (getuid() != 0) {

		printf("Please run the test as root - Exiting.\n");

		exit(-1);

	}

	/* Open Media device and keep it open */

	fd = open(media_device, O_RDWR);

	if (fd == -1) {

		printf("Media Device open errno %s\n", strerror(errno));

		exit(-1);

	}

	printf("\nNote:\n"

	       "While test is running, remove the device and\n"

	       "ensure there are no use after free errors and\n"

	       "other Oops in the dmesg. Enable KaSan kernel\n"

	       "config option for use-after-free error detection.\n\n");

	while (count < 100) {

		ret = ioctl(fd, MEDIA_IOC_DEVICE_INFO, &mdi);

		if (ret < 0)

			printf("Media Device Info errno %s\n", strerror(errno));

		printf("Media device model %s driver %s\n",

			mdi.model, mdi.driver);

		sleep(10);

		count++;

	}

}