/**
 * Userspace PCI Endpoint Test Module
 *
 * Copyright (C) 2017 Texas Instruments
 * Author: Kishon Vijay Abraham I <kishon@ti.com>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 of
 * the License as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <errno.h>
#include <fcntl.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <unistd.h>

#include <linux/pcitest.h>

#define BILLION 1E9

static char *result[] = { "NOT OKAY", "OKAY" };

struct pci_test {
	char		*device;
	char		barnum;
	bool		legacyirq;
	unsigned int	msinum;
	bool		read;
	bool		write;
	bool		copy;
	unsigned long	size;
};

static int run_test(struct pci_test *test)
{
	int ret = -EINVAL;
	int fd;

	fd = open(test->device, O_RDWR);
	if (fd < 0) {
		perror("can't open PCI Endpoint Test device");
		return -ENODEV;
	}

	if (test->barnum >= 0 && test->barnum <= 5) {
		ret = ioctl(fd, PCITEST_BAR, test->barnum);
		fprintf(stdout, "BAR%d:\t\t", test->barnum);
		if (ret < 0)
			fprintf(stdout, "TEST FAILED\n");
		else
			fprintf(stdout, "%s\n", result[ret]);
	}

	if (test->legacyirq) {
		ret = ioctl(fd, PCITEST_LEGACY_IRQ, 0);
		fprintf(stdout, "LEGACY IRQ:\t");
		if (ret < 0)
			fprintf(stdout, "TEST FAILED\n");
		else
			fprintf(stdout, "%s\n", result[ret]);
	}

	if (test->msinum > 0 && test->msinum <= 32) {
		ret = ioctl(fd, PCITEST_MSI, test->msinum);
		fprintf(stdout, "MSI%d:\t\t", test->msinum);
		if (ret < 0)
			fprintf(stdout, "TEST FAILED\n");
		else
			fprintf(stdout, "%s\n", result[ret]);
	}

	if (test->write) {
		ret = ioctl(fd, PCITEST_WRITE, test->size);
		fprintf(stdout, "WRITE (%7ld bytes):\t\t", test->size);
		if (ret < 0)
			fprintf(stdout, "TEST FAILED\n");
		else
			fprintf(stdout, "%s\n", result[ret]);
	}

	if (test->read) {
		ret = ioctl(fd, PCITEST_READ, test->size);
		fprintf(stdout, "READ (%7ld bytes):\t\t", test->size);
		if (ret < 0)
			fprintf(stdout, "TEST FAILED\n");
		else
			fprintf(stdout, "%s\n", result[ret]);
	}

	if (test->copy) {
		ret = ioctl(fd, PCITEST_COPY, test->size);
		fprintf(stdout, "COPY (%7ld bytes):\t\t", test->size);
		if (ret < 0)
			fprintf(stdout, "TEST FAILED\n");
		else
			fprintf(stdout, "%s\n", result[ret]);
	}

	fflush(stdout);
}

int main(int argc, char **argv)
{
	int c;
	struct pci_test *test;

	test = calloc(1, sizeof(*test));
	if (!test) {
		perror("Fail to allocate memory for pci_test\n");
		return -ENOMEM;
	}

	/* since '0' is a valid BAR number, initialize it to -1 */
	test->barnum = -1;

	/* set default size as 100KB */
	test->size = 0x19000;

	/* set default endpoint device */
	test->device = "/dev/pci-endpoint-test.0";

	while ((c = getopt(argc, argv, "D:b:m:lrwcs:")) != EOF)
	switch (c) {
	case 'D':
		test->device = optarg;
		continue;
	case 'b':
		test->barnum = atoi(optarg);
		if (test->barnum < 0 || test->barnum > 5)
			goto usage;
		continue;
	case 'l':
		test->legacyirq = true;
		continue;
	case 'm':
		test->msinum = atoi(optarg);
		if (test->msinum < 1 || test->msinum > 32)
			goto usage;
		continue;
	case 'r':
		test->read = true;
		continue;
	case 'w':
		test->write = true;
		continue;
	case 'c':
		test->copy = true;
		continue;
	case 's':
		test->size = strtoul(optarg, NULL, 0);
		continue;
	case '?':
	case 'h':
	default:
usage:
		fprintf(stderr,
			"usage: %s [options]\n"
			"Options:\n"
			"\t-D <dev>		PCI endpoint test device {default: /dev/pci-endpoint-test.0}\n"
			"\t-b <bar num>		BAR test (bar number between 0..5)\n"
			"\t-m <msi num>		MSI test (msi number between 1..32)\n"
			"\t-l			Legacy IRQ test\n"
			"\t-r			Read buffer test\n"
			"\t-w			Write buffer test\n"
			"\t-c			Copy buffer test\n"
			"\t-s <size>		Size of buffer {default: 100KB}\n",
			argv[0]);
		return -EINVAL;
	}

	run_test(test);
	return 0;
}