// SPDX-License-Identifier: GPL-2.0
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/*
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* media_device_test.c - Media Controller Device ioctl loop Test
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*
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* Copyright (c) 2016 Shuah Khan <shuahkh@osg.samsung.com>
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* Copyright (c) 2016 Samsung Electronics Co., Ltd.
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*
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*/
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/*
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* This file adds a test for Media Controller API.
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* This test should be run as root and should not be
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* included in the Kselftest run. This test should be
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* run when hardware and driver that makes use Media
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* Controller API are present in the system.
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*
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* This test opens user specified Media Device and calls
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* MEDIA_IOC_DEVICE_INFO ioctl in a loop once every 10
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* seconds.
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*
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* Usage:
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* sudo ./media_device_test -d /dev/mediaX
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*
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* While test is running, remove the device and
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* ensure there are no use after free errors and
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* other Oops in the dmesg. Enable KaSan kernel
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* config option for use-after-free error detection.
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <string.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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#include <time.h>
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#include <linux/media.h>
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#include "../kselftest.h"
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int main(int argc, char **argv)
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{
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int opt;
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char media_device[256];
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int count;
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struct media_device_info mdi;
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int ret;
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int fd;
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if (argc < 2) {
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printf("Usage: %s [-d </dev/mediaX>]\n", argv[0]);
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exit(-1);
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}
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/* Process arguments */
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while ((opt = getopt(argc, argv, "d:")) != -1) {
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switch (opt) {
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case 'd':
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strncpy(media_device, optarg, sizeof(media_device) - 1);
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media_device[sizeof(media_device)-1] = '\0';
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break;
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default:
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printf("Usage: %s [-d </dev/mediaX>]\n", argv[0]);
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exit(-1);
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}
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}
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if (getuid() != 0)
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ksft_exit_skip("Please run the test as root - Exiting.\n");
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/* Generate random number of interations */
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srand((unsigned int) time(NULL));
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count = rand();
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/* Open Media device and keep it open */
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fd = open(media_device, O_RDWR);
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if (fd == -1) {
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printf("Media Device open errno %s\n", strerror(errno));
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exit(-1);
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}
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printf("\nNote:\n"
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"While test is running, remove the device and\n"
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"ensure there are no use after free errors and\n"
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"other Oops in the dmesg. Enable KaSan kernel\n"
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"config option for use-after-free error detection.\n\n");
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printf("Running test for %d iterations\n", count);
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while (count > 0) {
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ret = ioctl(fd, MEDIA_IOC_DEVICE_INFO, &mdi);
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if (ret < 0)
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printf("Media Device Info errno %s\n", strerror(errno));
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else
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printf("Media device model %s driver %s - count %d\n",
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mdi.model, mdi.driver, count);
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sleep(10);
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count--;
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}
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}
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