/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (C) 2012 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 "nvme_private.h"

int
nvme_ns_cmd_read(struct nvme_namespace *ns, void *payload, uint64_t lba,
    uint32_t lba_count, nvme_cb_fn_t cb_fn, void *cb_arg)
{
	struct nvme_request	*req;

	req = nvme_allocate_request_vaddr(payload,
	    lba_count * nvme_ns_get_sector_size(ns), M_NOWAIT, cb_fn, cb_arg);
	if (req == NULL)
		return (ENOMEM);

	nvme_ns_read_cmd(&req->cmd, ns->id, lba, lba_count);

	nvme_ctrlr_submit_io_request(ns->ctrlr, req);

	return (0);
}

int
nvme_ns_cmd_read_bio(struct nvme_namespace *ns, struct bio *bp,
    nvme_cb_fn_t cb_fn, void *cb_arg)
{
	struct nvme_request	*req;
	uint64_t		lba;
	uint64_t		lba_count;

	req = nvme_allocate_request_bio(bp, M_NOWAIT, cb_fn, cb_arg);
	if (req == NULL)
		return (ENOMEM);
	lba = bp->bio_offset / nvme_ns_get_sector_size(ns);
	lba_count = bp->bio_bcount / nvme_ns_get_sector_size(ns);
	nvme_ns_read_cmd(&req->cmd, ns->id, lba, lba_count);

	nvme_ctrlr_submit_io_request(ns->ctrlr, req);

	return (0);
}

int
nvme_ns_cmd_write(struct nvme_namespace *ns, void *payload, uint64_t lba,
    uint32_t lba_count, nvme_cb_fn_t cb_fn, void *cb_arg)
{
	struct nvme_request	*req;

	req = nvme_allocate_request_vaddr(payload,
	    lba_count * nvme_ns_get_sector_size(ns), M_NOWAIT, cb_fn, cb_arg);
	if (req == NULL)
		return (ENOMEM);

	nvme_ns_write_cmd(&req->cmd, ns->id, lba, lba_count);

	nvme_ctrlr_submit_io_request(ns->ctrlr, req);

	return (0);
}

int
nvme_ns_cmd_write_bio(struct nvme_namespace *ns, struct bio *bp,
    nvme_cb_fn_t cb_fn, void *cb_arg)
{
	struct nvme_request	*req;
	uint64_t		lba;
	uint64_t		lba_count;

	req = nvme_allocate_request_bio(bp, M_NOWAIT, cb_fn, cb_arg);
	if (req == NULL)
		return (ENOMEM);
	lba = bp->bio_offset / nvme_ns_get_sector_size(ns);
	lba_count = bp->bio_bcount / nvme_ns_get_sector_size(ns);
	nvme_ns_write_cmd(&req->cmd, ns->id, lba, lba_count);

	nvme_ctrlr_submit_io_request(ns->ctrlr, req);

	return (0);
}

int
nvme_ns_cmd_deallocate(struct nvme_namespace *ns, void *payload,
    uint8_t num_ranges, nvme_cb_fn_t cb_fn, void *cb_arg)
{
	struct nvme_request	*req;
	struct nvme_command	*cmd;

	req = nvme_allocate_request_vaddr(payload,
	    num_ranges * sizeof(struct nvme_dsm_range), M_NOWAIT, cb_fn,
	    cb_arg);
	if (req == NULL)
		return (ENOMEM);

	cmd = &req->cmd;
	cmd->opc = NVME_OPC_DATASET_MANAGEMENT;
	cmd->nsid = htole32(ns->id);

	/* TODO: create a delete command data structure */
	cmd->cdw10 = htole32(num_ranges - 1);
	cmd->cdw11 = htole32(NVME_DSM_ATTR_DEALLOCATE);

	nvme_ctrlr_submit_io_request(ns->ctrlr, req);

	return (0);
}

int
nvme_ns_cmd_flush(struct nvme_namespace *ns, nvme_cb_fn_t cb_fn, void *cb_arg)
{
	struct nvme_request	*req;

	req = nvme_allocate_request_null(M_NOWAIT, cb_fn, cb_arg);
	if (req == NULL)
		return (ENOMEM);

	nvme_ns_flush_cmd(&req->cmd, ns->id);
	nvme_ctrlr_submit_io_request(ns->ctrlr, req);

	return (0);
}

/* Timeout = 1 sec */
#define NVD_DUMP_TIMEOUT	200000

int
nvme_ns_dump(struct nvme_namespace *ns, void *virt, off_t offset, size_t len)
{
	struct nvme_completion_poll_status status;
	struct nvme_request *req;
	struct nvme_command *cmd;
	uint64_t lba, lba_count;
	int i;

	status.done = FALSE;
	req = nvme_allocate_request_vaddr(virt, len, M_NOWAIT,
	    nvme_completion_poll_cb, &status);
	if (req == NULL)
		return (ENOMEM);

	cmd = &req->cmd;

	if (len > 0) {
		lba = offset / nvme_ns_get_sector_size(ns);
		lba_count = len / nvme_ns_get_sector_size(ns);
		nvme_ns_write_cmd(cmd, ns->id, lba, lba_count);
	} else
		nvme_ns_flush_cmd(cmd, ns->id);

	nvme_ctrlr_submit_io_request(ns->ctrlr, req);
	if (req->qpair == NULL)
		return (ENXIO);

	i = 0;
	while ((i++ < NVD_DUMP_TIMEOUT) && (status.done == FALSE)) {
		DELAY(5);
		nvme_qpair_process_completions(req->qpair);
	}

	/*
	 * Normally, when using the polling interface, we can't return a
	 * timeout error because we don't know when the completion routines
	 * will be called if the command later completes. However, in this
	 * case we're running a system dump, so all interrupts are turned
	 * off, the scheduler isn't running so there's nothing to complete
	 * the transaction.
	 */
	if (status.done == FALSE)
		return (ETIMEDOUT);

	return (0);
}