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freebsd-skq/sys/dev/amr/amr_disk.c
scottl f470ab4283 Lock the AMR driver: 
- Introduce the amr_io_lock to control access to command queues, bio queues,
  and the hardware.
- Eliminate the taskqueue and do all completion processing in the ithread.
- Assign a static slot number to each command instead of doing a linear
  search for free slots each time a command is needed.
- Modify the interrupt handler to more closely match what Linux does, for
  safety.
2005-01-16 07:34:26 +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.
*/
/*-
* Copyright (c) 2002 Eric Moore
* Copyright (c) 2002 LSI Logic Corporation
* 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.
* 3. The party using or redistributing the source code and binary forms
* agrees to the disclaimer below and the terms and conditions set forth
* herein.
*
* 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>
__FBSDID("$FreeBSD$");
/*
* Disk driver for AMI MegaRaid controllers
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <dev/amr/amr_compat.h>
#include <sys/bus.h>
#include <sys/conf.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 disk_open_t amrd_open;
static disk_strategy_t amrd_strategy;
static devclass_t amrd_devclass;
#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(struct disk *dp)
{
struct amrd_softc *sc = (struct amrd_softc *)dp->d_drv1;
#if __FreeBSD_version < 500000 /* old buf style */
struct disklabel *label;
#endif
debug_called(1);
if (sc == NULL)
return (ENXIO);
/* controller not active? */
if (sc->amrd_controller->amr_state & AMR_STATE_SHUTDOWN)
return(ENXIO);
#if __FreeBSD_version < 500000 /* old buf style */
label = &sc->amrd_disk.d_label;
bzero(label, sizeof(*label));
label->d_type = DTYPE_SCSI;
label->d_secsize = AMR_BLKSIZE;
label->d_nsectors = sc->amrd_drive->al_sectors;
label->d_ntracks = sc->amrd_drive->al_heads;
label->d_ncylinders = sc->amrd_drive->al_cylinders;
label->d_secpercyl = sc->amrd_drive->al_sectors * sc->amrd_drive->al_heads;
label->d_secperunit = sc->amrd_drive->al_size;
#else
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;
#endif
return (0);
}
/********************************************************************************
* System crashdump support
*/
static int
amrd_dump(void *arg, void *virtual, vm_offset_t physical, off_t offset, size_t length)
{
struct amrd_softc *amrd_sc;
struct amr_softc *amr_sc;
int error;
struct disk *dp;
dp = arg;
amrd_sc = (struct amrd_softc *)dp->d_drv1;
if (amrd_sc == NULL)
return(ENXIO);
amr_sc = (struct amr_softc *)amrd_sc->amrd_controller;
if (length > 0) {
int driveno = amrd_sc->amrd_drive - amr_sc->amr_drive;
if ((error = amr_dump_blocks(amr_sc,driveno,offset / AMR_BLKSIZE ,(void *)virtual,(int) length / AMR_BLKSIZE )) != 0)
return(error);
}
return(0);
}
/*
* 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_disk->d_drv1;
/* bogus disk? */
if (sc == NULL) {
bio->bio_error = EINVAL;
goto bad;
}
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;
debug_called(2);
if (bio->bio_flags & BIO_ERROR) {
bio->bio_error = EIO;
debug(1, "i/o error\n");
} else {
bio->bio_resid = 0;
}
AMR_BIO_FINISH(bio);
}
static int
amrd_probe(device_t dev)
{
debug_called(1);
device_set_desc(dev, "LSILogic 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)));
sc->amrd_disk = disk_alloc();
sc->amrd_disk->d_drv1 = sc;
sc->amrd_disk->d_maxsize = (AMR_NSEG - 1) * PAGE_SIZE;
sc->amrd_disk->d_open = amrd_open;
sc->amrd_disk->d_strategy = amrd_strategy;
sc->amrd_disk->d_name = "amrd";
sc->amrd_disk->d_dump = (dumper_t *)amrd_dump;
sc->amrd_disk->d_unit = sc->amrd_unit;
sc->amrd_disk->d_flags = 0;
disk_create(sc->amrd_disk, DISK_VERSION);
#ifdef FREEBSD_4
disks_registered++;
#endif
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_disk->d_flags & DISKFLAG_OPEN)
return(EBUSY);
#ifdef FREEBSD_4
if (--disks_registered == 0)
cdevsw_remove(&amrddisk_cdevsw);
#else
disk_destroy(sc->amrd_disk);
#endif
return(0);
}
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