FreeBSD/Linux Kernel Cross Reference
sys/scsi/scsi_driver.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.
     *
     * $FreeBSD: src/sys/scsi/scsi_driver.c,v 1.18.2.1 1999/09/05 08:21:42 peter Exp $
     *
     */
    
    #include "opt_scsi.h"
    
    #include <sys/types.h>
    #include <sys/errno.h>
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/buf.h>
    #include <sys/malloc.h>
    #include <sys/fcntl.h>
    
    #include <scsi/scsi_all.h>
    #include <scsi/scsiconf.h>
    #include <scsi/scsi_driver.h>
    
    #define GETUNIT(DEVICE, DEV) \
            ((DEVICE)->getunit) ? (*(DEVICE)->getunit)((DEV)) \
                                    : (minor((DEV)) & ~SCSI_CONTROL_MASK)
    
    int
    scsi_goaway(int force) /* XXX should do a lot more */
    {
            return 0;
    }
    
    /* 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));
    
            sc_print_start(sc_link);
            printf("%s ", device->desc);
    
            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;
    
            sc_print_finish();
            printf("\n");
    
            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 %ld) result %d\n",
                   device->name, dev, 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, 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);
                   }
           }
   }

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