/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (C) 2012-2013 Intel Corporation
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
#include <sys/param.h>

#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdbool.h>
#include <libutil.h>
#include <paths.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <unistd.h>

#include "nvmecontrol.h"
#include "comnd.h"

/* Tables for command line parsing */

#define NVME_MAX_UNIT 256

static cmd_fn_t devlist;

static struct options {
	bool	human;
} opt = {
	.human = false,
};

static const struct opts devlist_opts[] = {
#define OPT(l, s, t, opt, addr, desc) { l, s, t, &opt.addr, desc }
	OPT("human", 'h', arg_none, opt, human,
	    "Show human readable disk size"),
	{ NULL, 0, arg_none, NULL, NULL }
};
#undef OPT

static struct cmd devlist_cmd = {
	.name = "devlist",
	.fn = devlist,
	.descr = "List NVMe controllers and namespaces",
	.ctx_size = sizeof(opt),
	.opts = devlist_opts,
	.args = NULL,
};

CMD_COMMAND(devlist_cmd);

/* End of tables for command line parsing */

static inline uint32_t
ns_get_sector_size(struct nvme_namespace_data *nsdata)
{
	uint8_t flbas_fmt, lbads;

	flbas_fmt = (nsdata->flbas >> NVME_NS_DATA_FLBAS_FORMAT_SHIFT) &
		NVME_NS_DATA_FLBAS_FORMAT_MASK;
	lbads = (nsdata->lbaf[flbas_fmt] >> NVME_NS_DATA_LBAF_LBADS_SHIFT) &
		NVME_NS_DATA_LBAF_LBADS_MASK;

	return (1 << lbads);
}

static void
devlist(const struct cmd *f, int argc, char *argv[])
{
	struct nvme_controller_data	cdata;
	struct nvme_namespace_data	nsdata;
	char				name[64];
	uint8_t				mn[64];
	uint8_t				buf[7];
	uint32_t			i;
	uint64_t			size;
	int				ctrlr, fd, found, ret;

	if (arg_parse(argc, argv, f))
		return;

	ctrlr = -1;
	found = 0;

	while (ctrlr < NVME_MAX_UNIT) {
		ctrlr++;
		sprintf(name, "%s%d", NVME_CTRLR_PREFIX, ctrlr);

		ret = open_dev(name, &fd, 0, 0);

		if (ret == EACCES) {
			warnx("could not open "_PATH_DEV"%s\n", name);
			continue;
		} else if (ret != 0)
			continue;

		found++;
		if (read_controller_data(fd, &cdata))
			continue;
		nvme_strvis(mn, cdata.mn, sizeof(mn), NVME_MODEL_NUMBER_LENGTH);
		printf("%6s: %s\n", name, mn);

		for (i = 0; i < cdata.nn; i++) {
			if (read_namespace_data(fd, i + 1, &nsdata))
				continue;
			if (nsdata.nsze == 0)
				continue;
			sprintf(name, "%s%d%s%d", NVME_CTRLR_PREFIX, ctrlr,
			    NVME_NS_PREFIX, i + 1);
			size = nsdata.nsze * (uint64_t)ns_get_sector_size(&nsdata);
			if (opt.human) {
				humanize_number(buf, sizeof(buf), size, "B",
				    HN_AUTOSCALE, HN_B | HN_NOSPACE | HN_DECIMAL);
				printf("  %10s (%s)\n", name, buf);

			} else {
				printf("  %10s (%juMB)\n", name, (uintmax_t)size / 1024 / 1024);
			}
		}

		close(fd);
	}

	if (found == 0) {
		printf("No NVMe controllers found.\n");
		exit(EX_UNAVAILABLE);
	}

	exit(0);
}