/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *            Copyright 1994-2009 The FreeBSD Project.
 *            All rights reserved.
 *
 * 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 FREEBSD PROJECT``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 FREEBSD PROJECT 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.
 *
 * The views and conclusions contained in the software and documentation
 * are those of the authors and should not be interpreted as representing
 * official policies,either expressed or implied, of the FreeBSD Project.
 */

#include <sys/cdefs.h>
#include "opt_mfi.h"

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

#include <sys/bio.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/disk.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_syspd_probe(device_t dev);
static int      mfi_syspd_attach(device_t dev);
static int      mfi_syspd_detach(device_t dev);

static disk_open_t      mfi_syspd_open;
static disk_close_t     mfi_syspd_close;
static disk_strategy_t  mfi_syspd_strategy;
static dumper_t         mfi_syspd_dump;

static device_method_t mfi_syspd_methods[] = {
        DEVMETHOD(device_probe,         mfi_syspd_probe),
        DEVMETHOD(device_attach,        mfi_syspd_attach),
        DEVMETHOD(device_detach,        mfi_syspd_detach),
        DEVMETHOD_END
};

static driver_t mfi_syspd_driver = {
        "mfisyspd",
        mfi_syspd_methods,
        sizeof(struct mfi_system_pd)
};

DRIVER_MODULE(mfisyspd, mfi, mfi_syspd_driver, 0, 0);

static int
mfi_syspd_probe(device_t dev)
{
        return (0);
}

static int
mfi_syspd_attach(device_t dev)
{
        struct mfi_system_pd *sc;
        struct mfi_pd_info *pd_info;
        struct mfi_system_pending *syspd_pend;
        uint64_t sectors;
        uint32_t secsize;

        sc = device_get_softc(dev);
        pd_info = device_get_ivars(dev);
        sc->pd_dev = dev;
        sc->pd_id = pd_info->ref.v.device_id;
        sc->pd_unit = device_get_unit(dev);
        sc->pd_info = pd_info;
        sc->pd_controller = device_get_softc(device_get_parent(dev));
        sc->pd_flags = 0;

        sectors = pd_info->raw_size;
        secsize = MFI_SECTOR_LEN;
        mtx_lock(&sc->pd_controller->mfi_io_lock);
        TAILQ_INSERT_TAIL(&sc->pd_controller->mfi_syspd_tqh, sc, pd_link);
        TAILQ_FOREACH(syspd_pend, &sc->pd_controller->mfi_syspd_pend_tqh,
            pd_link) {
                TAILQ_REMOVE(&sc->pd_controller->mfi_syspd_pend_tqh,
                    syspd_pend, pd_link);
                free(syspd_pend, M_MFIBUF);
                break;
        }
        mtx_unlock(&sc->pd_controller->mfi_io_lock);
        device_printf(dev, "%juMB (%ju sectors) SYSPD volume (deviceid: %d)\n",
                      sectors / (1024 * 1024 / secsize), sectors, sc->pd_id);
        sc->pd_disk = disk_alloc();
        sc->pd_disk->d_drv1 = sc;
        sc->pd_disk->d_maxsize = min(sc->pd_controller->mfi_max_io * secsize,
                (sc->pd_controller->mfi_max_sge - 1) * PAGE_SIZE);
        sc->pd_disk->d_name = "mfisyspd";
        sc->pd_disk->d_open = mfi_syspd_open;
        sc->pd_disk->d_close = mfi_syspd_close;
        sc->pd_disk->d_strategy = mfi_syspd_strategy;
        sc->pd_disk->d_dump = mfi_syspd_dump;
        sc->pd_disk->d_unit = sc->pd_unit;
        sc->pd_disk->d_sectorsize = secsize;
        sc->pd_disk->d_mediasize = sectors * secsize;
        if (sc->pd_disk->d_mediasize >= (1 * 1024 * 1024)) {
                sc->pd_disk->d_fwheads = 255;
                sc->pd_disk->d_fwsectors = 63;
        } else {
                sc->pd_disk->d_fwheads = 64;
                sc->pd_disk->d_fwsectors = 32;
        }
        sc->pd_disk->d_flags = DISKFLAG_UNMAPPED_BIO;
        disk_create(sc->pd_disk, DISK_VERSION);

        device_printf(dev, " SYSPD volume attached\n");

        return (0);
}

static int
mfi_syspd_detach(device_t dev)
{
        struct mfi_system_pd *sc;

        sc = device_get_softc(dev);
        device_printf(dev, "Detaching syspd\n");
        mtx_lock(&sc->pd_controller->mfi_io_lock);
        if (((sc->pd_disk->d_flags & DISKFLAG_OPEN) ||
            (sc->pd_flags & MFI_DISK_FLAGS_OPEN)) &&
            (sc->pd_controller->mfi_keep_deleted_volumes ||
            sc->pd_controller->mfi_detaching)) {
                mtx_unlock(&sc->pd_controller->mfi_io_lock);
                device_printf(dev, "Cant detach syspd\n");
                return (EBUSY);
        }
        mtx_unlock(&sc->pd_controller->mfi_io_lock);

        disk_destroy(sc->pd_disk);
        mtx_lock(&sc->pd_controller->mfi_io_lock);
        TAILQ_REMOVE(&sc->pd_controller->mfi_syspd_tqh, sc, pd_link);
        mtx_unlock(&sc->pd_controller->mfi_io_lock);
        free(sc->pd_info, M_MFIBUF);
        return (0);
}

static int
mfi_syspd_open(struct disk *dp)
{
        struct mfi_system_pd *sc;
        int error;

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

static int
mfi_syspd_close(struct disk *dp)
{
        struct mfi_system_pd *sc;

        sc = dp->d_drv1;
        mtx_lock(&sc->pd_controller->mfi_io_lock);
        sc->pd_flags &= ~MFI_DISK_FLAGS_OPEN;
        mtx_unlock(&sc->pd_controller->mfi_io_lock);

        return (0);
}

int
mfi_syspd_disable(struct mfi_system_pd *sc)
{

        device_printf(sc->pd_dev, "syspd disable \n");
        mtx_assert(&sc->pd_controller->mfi_io_lock, MA_OWNED);
        if (sc->pd_flags & MFI_DISK_FLAGS_OPEN) {
                if (sc->pd_controller->mfi_delete_busy_volumes)
                        return (0);
                device_printf(sc->pd_dev,
                    "Unable to delete busy syspd device\n");
                return (EBUSY);
        }
        sc->pd_flags |= MFI_DISK_FLAGS_DISABLED;
        return (0);
}

void
mfi_syspd_enable(struct mfi_system_pd *sc)
{

        device_printf(sc->pd_dev, "syspd enable \n");
        mtx_assert(&sc->pd_controller->mfi_io_lock, MA_OWNED);
        sc->pd_flags &= ~MFI_DISK_FLAGS_DISABLED;
}

static void
mfi_syspd_strategy(struct bio *bio)
{
        struct mfi_system_pd *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->pd_controller;
        bio->bio_driver1 = (void *)(uintptr_t)sc->pd_id;
        /* Mark it as system PD IO */
        bio->bio_driver2 = (void *)MFI_SYS_PD_IO;
        mtx_lock(&controller->mfi_io_lock);
        mfi_enqueue_bio(controller, bio);
        mfi_startio(controller);
        mtx_unlock(&controller->mfi_io_lock);
        return;
}

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

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

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