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freebsd-skq/sys/dev/amr/amr_disk.c
scottl 1d0dc5ce33 Mega update to the LSI MegaRAID driver: 
1.  Implement a large set of ioctl shims so that the Linux management apps
from LSI will work.  This includes infrastructure to support adding, deleting
and rescanning arrays at runtime.  This is based on work from Doug Ambrosko,
heavily augmented by LSI and Yahoo.

2.  Implement full 64-bit DMA support.  Systems with more than 4GB of RAM
can now operate without the cost of bounce buffers.  Cards that cannot do
64-bit DMA will automatically revert to using bounce buffers.  This option
can be forced off by setting the 'hw.amr.force_sg32" tunable in the loader.
It should only be turned off for debugging purposes.  This work was sponsored
by Yahoo.

3.  Streamline the command delivery and interrupt handler paths after
much discussion with Dell and LSI.  The logic now closely matches the
intended design, making it both more robust and much faster.  Certain
i/o failures under heavy load should be fixed with this.

4.  Optimize the locking.  In the interrupt handler, the card can be checked
for completed commands without any locks held, due to the handler being
implicitely serialized and there being no need to look at any shared data.
Only grab the lock to return the command structure to the free pool.  A
small optimization can still be made to collect all of the completions
together and then free them together under a single lock.

Items 3 and 4 significantly increase the performance of the driver.  On an
LSI 320-2X card, transactions per second went from 13,000 to 31,000 in my
testing with these changes.  However, these changes are still fairly
experimental and shouldn't be merged to 6.x until there is more testing.

Thanks to Doug Ambrosko, LSI, Dell, and Yahoo for contributing towards
this.
2005-12-14 03:26:49 +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 <sys/bio.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
int amr_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;
debug_called(1);
if (sc == NULL)
return (ENXIO);
/* controller not active? */
if (sc->amrd_controller->amr_state & AMR_STATE_SHUTDOWN)
return(ENXIO);
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;
}
biodone(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;
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;
disk_create(sc->amrd_disk, DISK_VERSION);
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 (--amr_disks_registered == 0)
cdevsw_remove(&amrddisk_cdevsw);
#else
disk_destroy(sc->amrd_disk);
#endif
return(0);
}
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