freebsd-dev/sys/scsi/scsi_driver.c
1998-08-18 00:32:50 +00:00

246 lines
6.8 KiB
C

/*
* Copyright (C) 1995, HD Associates, Inc.
* PO Box 276
* Pepperell, MA 01463
* 508 433 5266
* dufault@hda.com
*
* This code is contributed to the University of California at Berkeley:
*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
*
* $Id: scsi_driver.c,v 1.26 1997/09/02 20:06:34 bde Exp $
*
*/
#include "opt_scsi.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/buf.h>
#include <scsi/scsiconf.h>
#include <scsi/scsi_debug.h>
#include <scsi/scsi_driver.h>
#define GETUNIT(DEVICE, DEV) \
((DEVICE)->getunit) ? (*(DEVICE)->getunit)((DEV)) \
: (minor((DEV)) & ~SCSI_CONTROL_MASK)
/* scsi_device_attach: Attach a SCSI device. This routine will
* print out the device address, what it is, then call the type
* attach function and when that returns print a newline. If the
* type attach will make LOT's of noise it should print a leading
* newline and then the address using sc_print_addr. See "sd.c".
*/
int scsi_device_attach(struct scsi_link *sc_link)
{
errval errcode;
dev_t dev;
struct scsi_device *device = sc_link->device;
if (bootverbose)
sc_link->flags |= SDEV_BOOTVERBOSE;
SC_DEBUG(sc_link, SDEV_DB2,
("%s%dattach: ", device->name, sc_link->dev_unit));
/* Print _sane_ probe info! */
printf("%s%d at scbus%d target %d lun %d\n",
sc_link->device->name, sc_link->dev_unit,
sc_link->scsibus, sc_link->target, sc_link->lun);
#ifndef SCSIDEBUG
scsi_print_info(sc_link);
#endif
printf("%s%d: %s ", device->name, sc_link->dev_unit, device->desc);
/*
* XXX some SCSI adapter drivers print out things while the
* device-specific attach routine is running. The result is
* something of a mess. This hack at least keeps it so each
* line will begin with foodev0:.
*/
sc_print_init();
dev = scsi_dev_lookup(device->open);
sc_link->dev = (device->setunit ?
(*device->setunit)(dev, sc_link->dev_unit) :
makedev(major(dev), sc_link->dev_unit) );
errcode = (device->attach) ? (*(device->attach))(sc_link) : 0;
printf("\n");
sc_print_finish();
if (errcode == 0)
sc_link->flags |= device->link_flags;
return errcode;
}
int
scsi_open(dev_t dev, int flags, int fmt, struct proc *p,
struct scsi_device *device)
{
errval errcode;
u_int32_t unit;
struct scsi_link *sc_link;
if (device == 0)
return ENXIO;
unit = GETUNIT(device, dev);
sc_link = SCSI_LINK(device, unit);
/*
* Check the unit is legal
*/
if (sc_link == 0 || (sc_link->sd == 0 && !(sc_link->flags & SDEV_UK)))
return ENXIO;
/* If it is a "once only" device that is already open return EBUSY.
*/
if ((sc_link->flags & SDEV_ONCE_ONLY) && (sc_link->flags & SDEV_IS_OPEN))
return EBUSY;
/* For the control device (user ioctl's only) don't call the open
* entry.
*/
if (SCSI_CONTROL(dev) || (device->dev_open == 0))
{
scsi_test_unit_ready(sc_link, SCSI_SILENT);
errcode = 0;
}
else
errcode = (*device->dev_open)(dev, flags, fmt, p, sc_link);
if (!errcode ) sc_link->flags |= SDEV_IS_OPEN;
SC_DEBUG(sc_link, SDEV_DB1, ("%sopen: dev=0x%lx (unit %lu) result %d\n",
device->name, (u_long)dev, (u_long)unit, errcode));
return errcode;
}
int
scsi_close(dev_t dev, int flags, int fmt, struct proc *p,
struct scsi_device *device)
{
errval errcode;
struct scsi_link *sc_link = SCSI_LINK(device, GETUNIT(device, dev));
SC_DEBUG(sc_link, SDEV_DB1, ("%sclose: Closing device\n", device->name));
if (SCSI_CONTROL(dev) || (device->dev_close == 0))
errcode = 0;
else
errcode = (*device->dev_close)(dev, flags, fmt, p, sc_link);
sc_link->flags &= ~SDEV_IS_OPEN;
return errcode;
}
int
scsi_ioctl(dev_t dev, u_int32_t cmd, caddr_t arg, int flags, struct proc *p,
struct scsi_device *device)
{
errval errcode;
struct scsi_link *sc_link = SCSI_LINK(device, GETUNIT(device, dev));
if (SCSI_CONTROL(dev) || (device->dev_ioctl == 0))
errcode = scsi_do_ioctl(dev, cmd, arg, flags, p, sc_link);
else
errcode = (*device->dev_ioctl)(dev, cmd, arg, flags, p, sc_link);
return errcode;
}
void
scsi_minphys(struct buf *bp, struct scsi_device *device)
{
struct scsi_link *sc_link = SCSI_LINK(device, GETUNIT(device, bp->b_dev));
(*sc_link->adapter->scsi_minphys)(bp);
}
void
scsi_strategy(struct buf *bp, struct scsi_device *device)
{
u_int32_t unit = GETUNIT(device, bp->b_dev);
struct scsi_link *sc_link = SCSI_LINK(device, unit);
SC_DEBUG(sc_link, SDEV_DB2, ("\n%sstrategy ", device->name));
SC_DEBUG(sc_link, SDEV_DB1, ("%ld bytes @ blk%ld\n",
bp->b_bcount, (long)bp->b_blkno));
if (SCSI_CONTROL(bp->b_dev) || (device->dev_strategy == 0))
{
bp->b_resid = bp->b_bcount;
bp->b_error = EIO;
bp->b_flags |= B_ERROR;
biodone(bp);
}
else
{
bp->b_resid = 0;
bp->b_error = 0;
if (bp->b_bcount == 0)
biodone(bp);
else
{
(*sc_link->adapter->scsi_minphys)(bp);
(*device->dev_strategy)(bp, sc_link);
}
}
}
int scsi_device_lock(struct scsi_link *sc_link)
{
int error;
while (sc_link->flags & SDEV_XLOCK) {
sc_link->flags |= SDEV_WANT;
error = tsleep(&sc_link->flags, PRIBIO | PCATCH, "sdevlk",0);
if (error)
return error;
}
sc_link->flags |= SDEV_XLOCK;
return 0;
}
void scsi_device_unlock(struct scsi_link *sc_link)
{
sc_link->flags &= ~SDEV_XLOCK;
if (sc_link->flags & SDEV_WANT) {
sc_link->flags &= ~SDEV_WANT;
wakeup(&sc_link->flags);
}
}