/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2006 IronPort Systems
 * 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 "opt_mfi.h"

#include <sys/param.h>
#include <sys/bio.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/disk.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <sys/selinfo.h>
#include <sys/sysctl.h>
#include <sys/systm.h>
#include <sys/uio.h>

#include <geom/geom_disk.h>

#include <vm/vm.h>
#include <vm/pmap.h>

#include <machine/md_var.h>
#include <machine/bus.h>
#include <sys/rman.h>

#include <dev/mfi/mfireg.h>
#include <dev/mfi/mfi_ioctl.h>
#include <dev/mfi/mfivar.h>

static int      mfi_disk_probe(device_t dev);
static int      mfi_disk_attach(device_t dev);
static int      mfi_disk_detach(device_t dev);

static disk_open_t      mfi_disk_open;
static disk_close_t     mfi_disk_close;
static disk_strategy_t  mfi_disk_strategy;
static dumper_t         mfi_disk_dump;

static device_method_t mfi_disk_methods[] = {
        DEVMETHOD(device_probe,         mfi_disk_probe),
        DEVMETHOD(device_attach,        mfi_disk_attach),
        DEVMETHOD(device_detach,        mfi_disk_detach),
        DEVMETHOD_END
};

static driver_t mfi_disk_driver = {
        "mfid",
        mfi_disk_methods,
        sizeof(struct mfi_disk)
};

DRIVER_MODULE(mfid, mfi, mfi_disk_driver, 0, 0);

static int
mfi_disk_probe(device_t dev)
{

        return (0);
}

static int
mfi_disk_attach(device_t dev)
{
        struct mfi_disk *sc;
        struct mfi_ld_info *ld_info;
        struct mfi_disk_pending *ld_pend;
        uint64_t sectors;
        uint32_t secsize;
        char *state;

        sc = device_get_softc(dev);
        ld_info = device_get_ivars(dev);

        sc->ld_dev = dev;
        sc->ld_id = ld_info->ld_config.properties.ld.v.target_id;
        sc->ld_unit = device_get_unit(dev);
        sc->ld_info = ld_info;
        sc->ld_controller = device_get_softc(device_get_parent(dev));
        sc->ld_flags = 0;

        sectors = ld_info->size;
        secsize = MFI_SECTOR_LEN;
        mtx_lock(&sc->ld_controller->mfi_io_lock);
        TAILQ_INSERT_TAIL(&sc->ld_controller->mfi_ld_tqh, sc, ld_link);
        TAILQ_FOREACH(ld_pend, &sc->ld_controller->mfi_ld_pend_tqh,
            ld_link) {
                TAILQ_REMOVE(&sc->ld_controller->mfi_ld_pend_tqh,
                    ld_pend, ld_link);
                free(ld_pend, M_MFIBUF);
                break;
        }
        mtx_unlock(&sc->ld_controller->mfi_io_lock);

        switch (ld_info->ld_config.params.state) {
        case MFI_LD_STATE_OFFLINE:
                state = "offline";
                break;
        case MFI_LD_STATE_PARTIALLY_DEGRADED:
                state = "partially degraded";
                break;
        case MFI_LD_STATE_DEGRADED:
                state = "degraded";
                break;
        case MFI_LD_STATE_OPTIMAL:
                state = "optimal";
                break;
        default:
                state = "unknown";
                break;
        }

        if ( strlen(ld_info->ld_config.properties.name) == 0 ) {
                device_printf(dev,
                      "%juMB (%ju sectors) RAID volume (no label) is %s\n",
                       sectors / (1024 * 1024 / secsize), sectors, state);
        } else {
                device_printf(dev,
                      "%juMB (%ju sectors) RAID volume '%s' is %s\n",
                      sectors / (1024 * 1024 / secsize), sectors,
                      ld_info->ld_config.properties.name, state);
        }

        sc->ld_disk = disk_alloc();
        sc->ld_disk->d_drv1 = sc;
        sc->ld_disk->d_maxsize = min(sc->ld_controller->mfi_max_io * secsize,
            (sc->ld_controller->mfi_max_sge - 1) * PAGE_SIZE);
        sc->ld_disk->d_name = "mfid";
        sc->ld_disk->d_open = mfi_disk_open;
        sc->ld_disk->d_close = mfi_disk_close;
        sc->ld_disk->d_strategy = mfi_disk_strategy;
        sc->ld_disk->d_dump = mfi_disk_dump;
        sc->ld_disk->d_unit = sc->ld_unit;
        sc->ld_disk->d_sectorsize = secsize;
        sc->ld_disk->d_mediasize = sectors * secsize;
        if (sc->ld_disk->d_mediasize >= (1 * 1024 * 1024)) {
                sc->ld_disk->d_fwheads = 255;
                sc->ld_disk->d_fwsectors = 63;
        } else {
                sc->ld_disk->d_fwheads = 64;
                sc->ld_disk->d_fwsectors = 32;
        }
        sc->ld_disk->d_flags = DISKFLAG_UNMAPPED_BIO;
        disk_create(sc->ld_disk, DISK_VERSION);

        return (0);
}

static int
mfi_disk_detach(device_t dev)
{
        struct mfi_disk *sc;

        sc = device_get_softc(dev);

        mtx_lock(&sc->ld_controller->mfi_io_lock);
        if (((sc->ld_disk->d_flags & DISKFLAG_OPEN) ||
            (sc->ld_flags & MFI_DISK_FLAGS_OPEN)) &&
            (sc->ld_controller->mfi_keep_deleted_volumes ||
            sc->ld_controller->mfi_detaching)) {
                mtx_unlock(&sc->ld_controller->mfi_io_lock);
                return (EBUSY);
        }
        mtx_unlock(&sc->ld_controller->mfi_io_lock);

        disk_destroy(sc->ld_disk);
        mtx_lock(&sc->ld_controller->mfi_io_lock);
        TAILQ_REMOVE(&sc->ld_controller->mfi_ld_tqh, sc, ld_link);
        mtx_unlock(&sc->ld_controller->mfi_io_lock);
        free(sc->ld_info, M_MFIBUF);
        return (0);
}

static int
mfi_disk_open(struct disk *dp)
{
        struct mfi_disk *sc;
        int error;

        sc = dp->d_drv1;
        mtx_lock(&sc->ld_controller->mfi_io_lock);
        if (sc->ld_flags & MFI_DISK_FLAGS_DISABLED)
                error = ENXIO;
        else {
                sc->ld_flags |= MFI_DISK_FLAGS_OPEN;
                error = 0;
        }
        mtx_unlock(&sc->ld_controller->mfi_io_lock);

        return (error);
}

static int
mfi_disk_close(struct disk *dp)
{
        struct mfi_disk *sc;

        sc = dp->d_drv1;
        mtx_lock(&sc->ld_controller->mfi_io_lock);
        sc->ld_flags &= ~MFI_DISK_FLAGS_OPEN;
        mtx_unlock(&sc->ld_controller->mfi_io_lock);

        return (0);
}

int
mfi_disk_disable(struct mfi_disk *sc)
{

        mtx_assert(&sc->ld_controller->mfi_io_lock, MA_OWNED);
        if (sc->ld_flags & MFI_DISK_FLAGS_OPEN) {
                if (sc->ld_controller->mfi_delete_busy_volumes)
                        return (0);
                device_printf(sc->ld_dev, "Unable to delete busy ld device\n");
                return (EBUSY);
        }
        sc->ld_flags |= MFI_DISK_FLAGS_DISABLED;
        return (0);
}

void
mfi_disk_enable(struct mfi_disk *sc)
{

        mtx_assert(&sc->ld_controller->mfi_io_lock, MA_OWNED);
        sc->ld_flags &= ~MFI_DISK_FLAGS_DISABLED;
}

static void
mfi_disk_strategy(struct bio *bio)
{
        struct mfi_disk *sc;
        struct mfi_softc *controller;

        sc = bio->bio_disk->d_drv1;

        if (sc == NULL) {
                bio->bio_error = EINVAL;
                bio->bio_flags |= BIO_ERROR;
                bio->bio_resid = bio->bio_bcount;
                biodone(bio);
                return;
        }

        controller = sc->ld_controller;
        if (controller->adpreset) {
                bio->bio_error = EBUSY;
                return;
        }

        if (controller->hw_crit_error) {
                bio->bio_error = EBUSY;
                return;
        }

        if (controller->issuepend_done == 0) {
                bio->bio_error = EBUSY;
                return;
        }

        bio->bio_driver1 = (void *)(uintptr_t)sc->ld_id;
        /* Mark it as LD IO */
        bio->bio_driver2 = (void *)MFI_LD_IO;
        mtx_lock(&controller->mfi_io_lock);
        mfi_enqueue_bio(controller, bio);
        mfi_startio(controller);
        mtx_unlock(&controller->mfi_io_lock);
        return;
}

void
mfi_disk_complete(struct bio *bio)
{

        if (bio->bio_flags & BIO_ERROR) {
                bio->bio_resid = bio->bio_bcount;
                if (bio->bio_error == 0)
                        bio->bio_error = EIO;
                disk_err(bio, "hard error", -1, 1);
        } else {
                bio->bio_resid = 0;
        }
        biodone(bio);
}

static int
mfi_disk_dump(void *arg, void *virt, off_t offset, size_t len)
{
        struct mfi_disk *sc;
        struct mfi_softc *parent_sc;
        struct disk *dp;
        int error;

        dp = arg;
        sc = dp->d_drv1;
        parent_sc = sc->ld_controller;

        if (len > 0) {
                if ((error = mfi_dump_blocks(parent_sc, sc->ld_id, offset /
                    MFI_SECTOR_LEN, virt, len)) != 0)
                        return (error);
        } else {
                /* mfi_sync_cache(parent_sc, sc->ld_id); */
        }

        return (0);
}