freebsd-dev/sys/dev/ida/ida_disk.c
John Baldwin 6b5b57ae9f Rework the DMA handling in ida(4) and add locking to make this driver
MPSAFE.
- Preallocate a full set of QCBs during attach rather than allocating new
  ones on demand to avoid allocations in the I/O path.
- Remove the explicit bus space tag/handle and use bus_*() on the
  relevant 'struct resource' instead.
- Defer logical drive probing to an intrhook.
- Fix ida_detach() to detach and delete child devices (logical drives).
- Update the DMA handling to support EINPROGRESS by moving the work to
  submit a mapped request into the bus_dma callback routine as well as
  add support for freezing the queue when EINPROGRESS is encountered.

Tested by:	Marco Steinbach  coco executive-computing de
2012-08-27 17:24:07 +00:00

228 lines
5.5 KiB
C

/*-
* Copyright (c) 1999,2000 Jonathan Lemon
* 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 Compaq SMART RAID adapters.
*/
#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 <sys/cons.h>
#include <machine/bus.h>
#include <sys/rman.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <machine/md_var.h>
#include <geom/geom_disk.h>
#include <dev/ida/idareg.h>
#include <dev/ida/idavar.h>
/* prototypes */
static int idad_probe(device_t dev);
static int idad_attach(device_t dev);
static int idad_detach(device_t dev);
static d_strategy_t idad_strategy;
static dumper_t idad_dump;
static devclass_t idad_devclass;
static device_method_t idad_methods[] = {
DEVMETHOD(device_probe, idad_probe),
DEVMETHOD(device_attach, idad_attach),
DEVMETHOD(device_detach, idad_detach),
{ 0, 0 }
};
static driver_t idad_driver = {
"idad",
idad_methods,
sizeof(struct idad_softc)
};
DRIVER_MODULE(idad, ida, idad_driver, idad_devclass, 0, 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
idad_strategy(struct bio *bp)
{
struct idad_softc *drv;
drv = bp->bio_disk->d_drv1;
if (drv == NULL) {
bp->bio_error = EINVAL;
goto bad;
}
/*
* software write protect check
*/
if (drv->flags & DRV_WRITEPROT && (bp->bio_cmd == BIO_WRITE)) {
bp->bio_error = EROFS;
goto bad;
}
bp->bio_driver1 = drv;
ida_submit_buf(drv->controller, bp);
return;
bad:
bp->bio_flags |= BIO_ERROR;
/*
* Correctly set the buf to indicate a completed transfer
*/
bp->bio_resid = bp->bio_bcount;
biodone(bp);
return;
}
static int
idad_dump(void *arg, void *virtual, vm_offset_t physical, off_t offset, size_t length)
{
struct idad_softc *drv;
int error = 0;
struct disk *dp;
dp = arg;
drv = dp->d_drv1;
if (drv == NULL)
return (ENXIO);
drv->controller->flags &= ~IDA_INTERRUPTS;
if (length > 0) {
error = ida_command(drv->controller, CMD_WRITE, virtual,
length, drv->drive, offset / DEV_BSIZE, DMA_DATA_OUT);
}
drv->controller->flags |= IDA_INTERRUPTS;
return (error);
}
void
idad_intr(struct bio *bp)
{
struct idad_softc *drv;
drv = bp->bio_disk->d_drv1;
if (bp->bio_flags & BIO_ERROR)
bp->bio_error = EIO;
else
bp->bio_resid = 0;
biodone(bp);
}
static int
idad_probe(device_t dev)
{
device_set_desc(dev, "Compaq Logical Drive");
return (0);
}
static int
idad_attach(device_t dev)
{
struct ida_drive_info dinfo;
struct idad_softc *drv;
device_t parent;
int error;
drv = (struct idad_softc *)device_get_softc(dev);
parent = device_get_parent(dev);
drv->dev = dev;
drv->controller = (struct ida_softc *)device_get_softc(parent);
drv->unit = device_get_unit(dev);
drv->drive = (intptr_t)device_get_ivars(dev);
mtx_lock(&drv->controller->lock);
error = ida_command(drv->controller, CMD_GET_LOG_DRV_INFO,
&dinfo, sizeof(dinfo), drv->drive, 0, DMA_DATA_IN);
mtx_unlock(&drv->controller->lock);
if (error) {
device_printf(dev, "CMD_GET_LOG_DRV_INFO failed\n");
return (ENXIO);
}
drv->cylinders = dinfo.dp.ncylinders;
drv->heads = dinfo.dp.nheads;
drv->sectors = dinfo.dp.nsectors;
drv->secsize = dinfo.secsize == 0 ? 512 : dinfo.secsize;
drv->secperunit = dinfo.secperunit;
/* XXX
* other initialization
*/
device_printf(dev, "%uMB (%u sectors), blocksize=%d\n",
drv->secperunit / ((1024 * 1024) / drv->secsize),
drv->secperunit, drv->secsize);
drv->disk = disk_alloc();
drv->disk->d_strategy = idad_strategy;
drv->disk->d_name = "idad";
drv->disk->d_dump = idad_dump;
drv->disk->d_sectorsize = drv->secsize;
drv->disk->d_mediasize = (off_t)drv->secperunit * drv->secsize;
drv->disk->d_fwsectors = drv->sectors;
drv->disk->d_fwheads = drv->heads;
drv->disk->d_drv1 = drv;
drv->disk->d_maxsize = DFLTPHYS; /* XXX guess? */
drv->disk->d_unit = drv->unit;
disk_create(drv->disk, DISK_VERSION);
return (0);
}
static int
idad_detach(device_t dev)
{
struct idad_softc *drv;
drv = (struct idad_softc *)device_get_softc(dev);
disk_destroy(drv->disk);
return (0);
}