3d04a9d7e3
Although it can go higher, it is not safe to so do on arrays with many members. Compromise by adding a tunable, "hw.aac.iosize_max" that can be set at boottime. Also document in the aac(4) manpage. MFC after: 4 weeks
298 lines
7.9 KiB
C
298 lines
7.9 KiB
C
/*-
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* Copyright (c) 2000 Michael Smith
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* Copyright (c) 2001 Scott Long
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* Copyright (c) 2000 BSDi
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* Copyright (c) 2001 Adaptec, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include "opt_aac.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/sysctl.h>
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#include <dev/aac/aac_compat.h>
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#include <sys/bus.h>
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#include <sys/conf.h>
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#include <sys/devicestat.h>
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#include <sys/disk.h>
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#include <machine/bus.h>
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#include <sys/rman.h>
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#include <dev/aac/aacreg.h>
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#include <dev/aac/aac_ioctl.h>
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#include <dev/aac/aacvar.h>
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/*
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* Interface to parent.
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*/
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static int aac_disk_probe(device_t dev);
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static int aac_disk_attach(device_t dev);
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static int aac_disk_detach(device_t dev);
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/*
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* Interface to the device switch.
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*/
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static d_open_t aac_disk_open;
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static d_close_t aac_disk_close;
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static d_strategy_t aac_disk_strategy;
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#define AAC_DISK_CDEV_MAJOR 151
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static struct cdevsw aac_disk_cdevsw = {
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/* open */ aac_disk_open,
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/* close */ aac_disk_close,
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/* read */ physread,
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/* write */ physwrite,
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/* ioctl */ noioctl,
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/* poll */ nopoll,
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/* mmap */ nommap,
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/* strategy */ aac_disk_strategy,
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/* name */ "aacd",
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/* maj */ AAC_DISK_CDEV_MAJOR,
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/* dump */ nodump,
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/* psize */ nopsize,
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/* flags */ D_DISK,
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};
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devclass_t aac_disk_devclass;
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static struct cdevsw aac_disk_disk_cdevsw;
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#ifdef FREEBSD_4
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static int disks_registered = 0;
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#endif
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static device_method_t aac_disk_methods[] = {
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DEVMETHOD(device_probe, aac_disk_probe),
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DEVMETHOD(device_attach, aac_disk_attach),
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DEVMETHOD(device_detach, aac_disk_detach),
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{ 0, 0 }
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};
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static driver_t aac_disk_driver = {
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"aacd",
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aac_disk_methods,
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sizeof(struct aac_disk)
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};
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DRIVER_MODULE(aacd, aac, aac_disk_driver, aac_disk_devclass, 0, 0);
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/* sysctl tunables */
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static unsigned int aac_iosize_max = 65536; /* due to limits of the card */
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TUNABLE_INT("hw.aac.iosize_max", &aac_iosize_max);
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SYSCTL_DECL(_hw_aac);
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SYSCTL_UINT(_hw_aac, OID_AUTO, iosize_max, CTLFLAG_RD, &aac_iosize_max, 0,
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"Max I/O size per transfer to an array");
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/******************************************************************************
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* Handle open from generic layer.
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*
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* This is called by the diskslice code on first open in order to get the
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* basic device geometry paramters.
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*/
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static int
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aac_disk_open(dev_t dev, int flags, int fmt, struct proc *p)
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{
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struct aac_disk *sc = (struct aac_disk *)dev->si_drv1;
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struct disklabel *label;
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debug_called(4);
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if (sc == NULL)
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return (ENXIO);
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/* check that the controller is up and running */
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if (sc->ad_controller->aac_state & AAC_STATE_SUSPEND)
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return(ENXIO);
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/* build synthetic label */
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label = &sc->ad_disk.d_label;
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bzero(label, sizeof(*label));
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label->d_type = DTYPE_ESDI;
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label->d_secsize = AAC_BLOCK_SIZE;
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label->d_nsectors = sc->ad_sectors;
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label->d_ntracks = sc->ad_heads;
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label->d_ncylinders = sc->ad_cylinders;
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label->d_secpercyl = sc->ad_sectors * sc->ad_heads;
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label->d_secperunit = sc->ad_size;
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sc->ad_flags |= AAC_DISK_OPEN;
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return (0);
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}
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/******************************************************************************
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* Handle last close of the disk device.
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*/
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static int
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aac_disk_close(dev_t dev, int flags, int fmt, struct proc *p)
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{
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struct aac_disk *sc = (struct aac_disk *)dev->si_drv1;
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debug_called(4);
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if (sc == NULL)
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return (ENXIO);
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sc->ad_flags &= ~AAC_DISK_OPEN;
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return (0);
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}
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/******************************************************************************
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* Handle an I/O request.
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*/
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static void
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aac_disk_strategy(struct bio *bp)
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{
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struct aac_disk *sc = (struct aac_disk *)bp->bio_dev->si_drv1;
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debug_called(4);
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/* bogus disk? */
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if (sc == NULL) {
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bp->bio_flags |= BIO_ERROR;
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bp->bio_error = EINVAL;
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biodone(bp);
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return;
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}
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/* perform accounting */
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devstat_start_transaction(&sc->ad_stats);
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/* pass the bio to the controller - it can work out who we are */
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aac_submit_bio(bp);
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return;
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}
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/******************************************************************************
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* Handle completion of an I/O request.
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*/
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void
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aac_biodone(struct bio *bp)
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{
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struct aac_disk *sc = (struct aac_disk *)bp->bio_dev->si_drv1;
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debug_called(4);
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devstat_end_transaction_bio(&sc->ad_stats, bp);
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if (bp->bio_flags & BIO_ERROR)
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diskerr(bp, (char *)bp->bio_driver1, 0, &sc->ad_label);
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biodone(bp);
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}
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/******************************************************************************
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* Stub only.
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*/
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static int
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aac_disk_probe(device_t dev)
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{
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debug_called(4);
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return (0);
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}
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/******************************************************************************
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* Attach a unit to the controller.
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*/
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static int
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aac_disk_attach(device_t dev)
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{
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struct aac_disk *sc = (struct aac_disk *)device_get_softc(dev);
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debug_called(4);
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/* initialise our softc */
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sc->ad_controller =
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(struct aac_softc *)device_get_softc(device_get_parent(dev));
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sc->ad_container = device_get_ivars(dev);
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sc->ad_dev = dev;
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/*
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* require that extended translation be enabled - other drivers read the
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* disk!
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*/
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sc->ad_size = sc->ad_container->co_mntobj.Capacity;
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if (sc->ad_size >= (2 * 1024 * 1024)) { /* 2GB */
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sc->ad_heads = 255;
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sc->ad_sectors = 63;
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} else if (sc->ad_size >= (1 * 1024 * 1024)) { /* 1GB */
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sc->ad_heads = 128;
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sc->ad_sectors = 32;
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} else {
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sc->ad_heads = 64;
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sc->ad_sectors = 32;
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}
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sc->ad_cylinders = (sc->ad_size / (sc->ad_heads * sc->ad_sectors));
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device_printf(dev, "%uMB (%u sectors)\n",
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sc->ad_size / ((1024 * 1024) / AAC_BLOCK_SIZE), sc->ad_size);
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devstat_add_entry(&sc->ad_stats, "aacd", device_get_unit(dev),
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AAC_BLOCK_SIZE, DEVSTAT_NO_ORDERED_TAGS,
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DEVSTAT_TYPE_STORARRAY | DEVSTAT_TYPE_IF_OTHER,
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DEVSTAT_PRIORITY_ARRAY);
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/* attach a generic disk device to ourselves */
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sc->ad_dev_t = disk_create(device_get_unit(dev), &sc->ad_disk, 0,
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&aac_disk_cdevsw, &aac_disk_disk_cdevsw);
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sc->ad_dev_t->si_drv1 = sc;
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#ifdef FREEBSD_4
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disks_registered++;
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#endif
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sc->ad_dev_t->si_iosize_max = aac_iosize_max;
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return (0);
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}
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/******************************************************************************
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* Disconnect ourselves from the system.
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*/
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static int
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aac_disk_detach(device_t dev)
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{
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struct aac_disk *sc = (struct aac_disk *)device_get_softc(dev);
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debug_called(4);
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if (sc->ad_flags & AAC_DISK_OPEN)
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return(EBUSY);
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devstat_remove_entry(&sc->ad_stats);
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#ifdef FREEBSD_4
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if (--disks_registered == 0)
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cdevsw_remove(&aac_disk_disk_cdevsw);
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#else
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disk_destroy(sc->ad_dev_t);
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#endif
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return(0);
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}
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