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freebsd/sys/dev/amr/amr_disk.c
Poul-Henning Kamp 7812d86f03 (This commit touches about 15 disk device drivers in a very consistent 
and predictable way, and I apologize if I have gotten it wrong anywhere,
getting prior review on a patch like this is not feasible, considering
the number of people involved and hardware availability etc.)

If struct disklabel is the messenger: kill the messenger.

Inside struct disk we had a struct disklabel which disk drivers used to
communicate certain metrics to the disklayer above (GEOM or the disk
mini-layer).  This commit changes this communication to use four
explicit fields instead.

Amongst the benefits is that the fields do not get overwritten by
wrong or bogus on-disk disklabels.

Once that is clear, <sys/disk.h> which is included in the drivers
no longer need to pull <sys/disklabel.h> and <sys/diskslice.h> in,
the few places that needs them, have gotten explicit #includes for
them.

The disklabel inside struct disk is now only for internal use in
the disk mini-layer, so instead of embedding it, we malloc it as
we need it.

This concludes (modulus any mistakes) the series of disklabel related
commits.

I belive it all amounts to a NOP for all the rest of you :-)

Sponsored by:   DARPA & NAI Labs.
2002-09-20 19:36:05 +00:00

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/*-
* Copyright (c) 1999 Jonathan Lemon
* Copyright (c) 1999, 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.
*
* $FreeBSD$
*/
/*
* Disk driver for AMI MegaRaid controllers
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <dev/amr/amr_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/amr/amrio.h>
#include <dev/amr/amrreg.h>
#include <dev/amr/amrvar.h>
#include <dev/amr/amr_tables.h>
/* prototypes */
static int amrd_probe(device_t dev);
static int amrd_attach(device_t dev);
static int amrd_detach(device_t dev);
static d_open_t amrd_open;
static d_close_t amrd_close;
static d_strategy_t amrd_strategy;
static d_ioctl_t amrd_ioctl;
#define AMRD_CDEV_MAJOR 133
static struct cdevsw amrd_cdevsw = {
/* open */ amrd_open,
/* close */ amrd_close,
/* read */ physread,
/* write */ physwrite,
/* ioctl */ amrd_ioctl,
/* poll */ nopoll,
/* mmap */ nommap,
/* strategy */ amrd_strategy,
/* name */ "amrd",
/* maj */ AMRD_CDEV_MAJOR,
/* dump */ nodump,
/* psize */ nopsize,
/* flags */ D_DISK,
};
static devclass_t amrd_devclass;
static struct cdevsw amrddisk_cdevsw;
#ifdef FREEBSD_4
static int disks_registered = 0;
#endif
static device_method_t amrd_methods[] = {
DEVMETHOD(device_probe, amrd_probe),
DEVMETHOD(device_attach, amrd_attach),
DEVMETHOD(device_detach, amrd_detach),
{ 0, 0 }
};
static driver_t amrd_driver = {
"amrd",
amrd_methods,
sizeof(struct amrd_softc)
};
DRIVER_MODULE(amrd, amr, amrd_driver, amrd_devclass, 0, 0);
static int
amrd_open(dev_t dev, int flags, int fmt, struct thread *td)
{
struct amrd_softc *sc = (struct amrd_softc *)dev->si_drv1;
debug_called(1);
if (sc == NULL)
return (ENXIO);
/* controller not active? */
if (sc->amrd_controller->amr_state & AMR_STATE_SHUTDOWN)
return(ENXIO);
sc->amrd_disk.d_sectorsize = AMR_BLKSIZE;
sc->amrd_disk.d_mediasize = (off_t)sc->amrd_drive->al_size * AMR_BLKSIZE;
sc->amrd_disk.d_fwsectors = sc->amrd_drive->al_sectors;
sc->amrd_disk.d_fwheads = sc->amrd_drive->al_heads;
sc->amrd_flags |= AMRD_OPEN;
return (0);
}
static int
amrd_close(dev_t dev, int flags, int fmt, struct thread *td)
{
struct amrd_softc *sc = (struct amrd_softc *)dev->si_drv1;
debug_called(1);
if (sc == NULL)
return (ENXIO);
sc->amrd_flags &= ~AMRD_OPEN;
return (0);
}
static int
amrd_ioctl(dev_t dev, u_long cmd, caddr_t addr, int32_t flag, struct thread *td)
{
return (ENOTTY);
}
/*
* Read/write routine for a buffer. Finds the proper unit, range checks
* arguments, and schedules the transfer. Does not wait for the transfer
* to complete. Multi-page transfers are supported. All I/O requests must
* be a multiple of a sector in length.
*/
static void
amrd_strategy(struct bio *bio)
{
struct amrd_softc *sc = (struct amrd_softc *)bio->bio_dev->si_drv1;
/* bogus disk? */
if (sc == NULL) {
bio->bio_error = EINVAL;
goto bad;
}
devstat_start_transaction(&sc->amrd_stats);
amr_submit_bio(sc->amrd_controller, bio);
return;
bad:
bio->bio_flags |= BIO_ERROR;
/*
* Correctly set the buf to indicate a completed transfer
*/
bio->bio_resid = bio->bio_bcount;
biodone(bio);
return;
}
void
amrd_intr(void *data)
{
struct bio *bio = (struct bio *)data;
struct amrd_softc *sc = (struct amrd_softc *)bio->bio_dev->si_drv1;
debug_called(2);
if (bio->bio_flags & BIO_ERROR) {
bio->bio_error = EIO;
debug(1, "i/o error\n");
} else {
bio->bio_resid = 0;
}
biofinish(bio, &sc->amrd_stats, 0);
}
static int
amrd_probe(device_t dev)
{
debug_called(1);
device_set_desc(dev, "MegaRAID logical drive");
return (0);
}
static int
amrd_attach(device_t dev)
{
struct amrd_softc *sc = (struct amrd_softc *)device_get_softc(dev);
device_t parent;
debug_called(1);
parent = device_get_parent(dev);
sc->amrd_controller = (struct amr_softc *)device_get_softc(parent);
sc->amrd_unit = device_get_unit(dev);
sc->amrd_drive = device_get_ivars(dev);
sc->amrd_dev = dev;
device_printf(dev, "%uMB (%u sectors) RAID %d (%s)\n",
sc->amrd_drive->al_size / ((1024 * 1024) / AMR_BLKSIZE),
sc->amrd_drive->al_size, sc->amrd_drive->al_properties & AMR_DRV_RAID_MASK,
amr_describe_code(amr_table_drvstate, AMR_DRV_CURSTATE(sc->amrd_drive->al_state)));
devstat_add_entry(&sc->amrd_stats, "amrd", sc->amrd_unit, AMR_BLKSIZE,
DEVSTAT_NO_ORDERED_TAGS,
DEVSTAT_TYPE_STORARRAY | DEVSTAT_TYPE_IF_OTHER,
DEVSTAT_PRIORITY_ARRAY);
sc->amrd_dev_t = disk_create(sc->amrd_unit, &sc->amrd_disk, 0, &amrd_cdevsw, &amrddisk_cdevsw);
sc->amrd_dev_t->si_drv1 = sc;
#ifdef FREEBSD_4
disks_registered++;
#endif
/* set maximum I/O size to match the maximum s/g size */
sc->amrd_dev_t->si_iosize_max = (AMR_NSEG - 1) * PAGE_SIZE;
return (0);
}
static int
amrd_detach(device_t dev)
{
struct amrd_softc *sc = (struct amrd_softc *)device_get_softc(dev);
debug_called(1);
if (sc->amrd_flags & AMRD_OPEN)
return(EBUSY);
devstat_remove_entry(&sc->amrd_stats);
#ifdef FREEBSD_4
if (--disks_registered == 0)
cdevsw_remove(&amrddisk_cdevsw);
#else
disk_destroy(sc->amrd_dev_t);
#endif
return(0);
}
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