freebsd-dev/sys/dev/aac/aac_disk.c

/*-
 * Copyright (c) 2000 Michael Smith
 * Copyright (c) 2000 BSDi
 * 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.
 *
 *	$FreeBSD$
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>

#include <dev/aac/aac_compat.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/devicestat.h>
#include <sys/disk.h>

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

#include <dev/aac/aacreg.h>
#include <dev/aac/aac_ioctl.h>
#include <dev/aac/aacvar.h>

/*
 * Interface to parent.
 */
static int aac_disk_probe(device_t dev);
static int aac_disk_attach(device_t dev);
static int aac_disk_detach(device_t dev);

/*
 * Interface to the device switch.
 */
static	d_open_t	aac_disk_open;
static	d_close_t	aac_disk_close;
static	d_strategy_t	aac_disk_strategy;

#define AAC_DISK_CDEV_MAJOR	151

static struct cdevsw aac_disk_cdevsw = {
    /* open */		aac_disk_open,
    /* close */		aac_disk_close,
    /* read */		physread,
    /* write */		physwrite,
    /* ioctl */		noioctl,
    /* poll */		nopoll,
    /* mmap */		nommap,
    /* strategy */	aac_disk_strategy,
    /* name */ 		"aacd",
    /* maj */		AAC_DISK_CDEV_MAJOR,
    /* dump */		nodump,
    /* psize */ 	nopsize,
    /* flags */		D_DISK,
    /* bmaj */		-1
};

devclass_t		aac_disk_devclass;
static struct cdevsw	aac_disk_disk_cdevsw;
#ifdef FREEBSD_4
static int		disks_registered = 0;
#endif

static device_method_t aac_disk_methods[] = {
    DEVMETHOD(device_probe,	aac_disk_probe),
    DEVMETHOD(device_attach,	aac_disk_attach),
    DEVMETHOD(device_detach,	aac_disk_detach),
    { 0, 0 }
};

static driver_t aac_disk_driver = {
    "aacd",
    aac_disk_methods,
    sizeof(struct aac_disk)
};

DRIVER_MODULE(aacd, aac, aac_disk_driver, aac_disk_devclass, 0, 0);

/********************************************************************************
 * Handle open from generic layer.
 *
 * This is called by the diskslice code on first open in order to get the 
 * basic device geometry paramters.
 */
static int
aac_disk_open(dev_t dev, int flags, int fmt, struct proc *p)
{
    struct aac_disk	*sc = (struct aac_disk *)dev->si_drv1;
    struct disklabel	*label;

    debug_called(4);
	
    if (sc == NULL)
	return (ENXIO);

    /* check that the controller is up and running */
    if (sc->ad_controller->aac_state & AAC_STATE_SUSPEND)
	return(ENXIO);

    /* build synthetic label */
    label = &sc->ad_disk.d_label;
    bzero(label, sizeof(*label));
    label->d_type = DTYPE_ESDI;
    label->d_secsize    = AAC_BLOCK_SIZE;
    label->d_nsectors   = sc->ad_sectors;
    label->d_ntracks    = sc->ad_heads;
    label->d_ncylinders = sc->ad_cylinders;
    label->d_secpercyl  = sc->ad_sectors * sc->ad_heads;
    label->d_secperunit = sc->ad_size;

    sc->ad_flags |= AAC_DISK_OPEN;
    return (0);
}

/********************************************************************************
 * Handle last close of the disk device.
 */
static int
aac_disk_close(dev_t dev, int flags, int fmt, struct proc *p)
{
    struct aac_disk	*sc = (struct aac_disk *)dev->si_drv1;

    debug_called(4);
	
    if (sc == NULL)
	return (ENXIO);

    sc->ad_flags &= ~AAC_DISK_OPEN;
    return (0);
}

/********************************************************************************
 * Handle an I/O request.
 */
static void
aac_disk_strategy(struct bio *bp)
{
    struct aac_disk	*sc = (struct aac_disk *)bp->bio_dev->si_drv1;

    debug_called(4);

    /* bogus disk? */
    if (sc == NULL) {
	bp->bio_flags |= BIO_ERROR;
	bp->bio_error = EINVAL;
	biodone(bp);
	return;
    }

    /* do-nothing operation? */
    if (bp->bio_bcount == 0) {
	bp->bio_resid = bp->bio_bcount;
	biodone(bp);
	return;
    }

    /* perform accounting */
    devstat_start_transaction(&sc->ad_stats);

    /* pass the bio to the controller - it can work out who we are */
    aac_submit_bio(bp);
    return;
}

/********************************************************************************
 * Handle completion of an I/O request.
 */
void
aac_biodone(struct bio *bp)
{
    struct aac_disk	*sc = (struct aac_disk *)bp->bio_dev->si_drv1;

    debug_called(4);

    devstat_end_transaction_bio(&sc->ad_stats, bp);
    if (bp->bio_flags & BIO_ERROR)	
	diskerr(bp, (char *)bp->bio_driver1, 0, &sc->ad_label);
    biodone(bp);
}

/********************************************************************************
 * Stub only.
 */
static int
aac_disk_probe(device_t dev)
{

    debug_called(4);

    return (0);
}

/********************************************************************************
 * Attach a unit to the controller.
 */
static int
aac_disk_attach(device_t dev)
{
    struct aac_disk	*sc = (struct aac_disk *)device_get_softc(dev);
    int			sgspace;
    int			maxsg;
    
    debug_called(4);

    /* initialise our softc */
    sc->ad_controller = (struct aac_softc *)device_get_softc(device_get_parent(dev));
    sc->ad_container = device_get_ivars(dev);
    sc->ad_dev = dev;

    /* require that extended translation be enabled - other drivers read the disk! */
    sc->ad_size = sc->ad_container->co_mntobj.Capacity;
    if (sc->ad_size >= (2 * 1024 * 1024)) {		/* 2GB */
	sc->ad_heads = 255;
	sc->ad_sectors = 63;
    } else if (sc->ad_size >= (2 * 1024 * 1024)) {	/* 1GB */
	sc->ad_heads = 128;
	sc->ad_sectors = 32;
    } else {
	sc->ad_heads = 64;
	sc->ad_sectors = 32;
    }
    sc->ad_cylinders = (sc->ad_size / (sc->ad_heads * sc->ad_sectors));

    device_printf(dev, "%uMB (%u sectors)\n",
		  sc->ad_size / ((1024 * 1024) / AAC_BLOCK_SIZE), sc->ad_size);

    devstat_add_entry(&sc->ad_stats, "aacd", device_get_unit(dev), AAC_BLOCK_SIZE,
		      DEVSTAT_NO_ORDERED_TAGS,
		      DEVSTAT_TYPE_STORARRAY | DEVSTAT_TYPE_IF_OTHER, 
		      DEVSTAT_PRIORITY_ARRAY);

    /* attach a generic disk device to ourselves */
    sc->ad_dev_t = disk_create(device_get_unit(dev), &sc->ad_disk, 0, &aac_disk_cdevsw, &aac_disk_disk_cdevsw);
    sc->ad_dev_t->si_drv1 = sc;
#ifdef FREEBSD_4
    disks_registered++;
#endif

    /*
     * We can calculate the maximum number of s/g entries based on the size of the
     * FIB and the command structures packed within it.
     */
    sgspace = (sizeof(struct aac_fib) - sizeof(struct aac_fib_header) - 
	       imax(sizeof(struct aac_blockwrite), sizeof(struct aac_blockread)));
    maxsg = (sgspace - sizeof(struct aac_sg_table)) / sizeof(struct aac_sg_entry);
	      
    /* set the maximum I/O size to the theoretical worst maximum allowed by the S/G list size */
    sc->ad_dev_t->si_iosize_max = (maxsg - 1) * PAGE_SIZE;

    return (0);
}

/********************************************************************************
 * Disconnect ourselves from the system.
 */
static int
aac_disk_detach(device_t dev)
{
    struct aac_disk *sc = (struct aac_disk *)device_get_softc(dev);

    debug_called(4);

    if (sc->ad_flags & AAC_DISK_OPEN)
	return(EBUSY);

    devstat_remove_entry(&sc->ad_stats);
#ifdef FREEBSD_4
    if (--disks_registered == 0)
	cdevsw_remove(&aac_disk_disk_cdevsw);
#else
    disk_destroy(sc->ad_dev_t);
#endif

    return(0);
}