freebsd-dev/sys/scsi/scsi_ioctl.c
John Dyson 40ab35ce04 Added bounce support for user scsi requests.
Reviewed by:	David Greenman
1995-05-09 02:38:15 +00:00

390 lines
9.8 KiB
C

/*
* Copyright (C) 1992, 1993, 1994, 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.
*End copyright
*
* $Id: scsi_ioctl.c,v 1.14 1995/05/03 18:09:12 dufault Exp $
*
*
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/malloc.h>
#include <sys/buf.h>
#define b_screq b_driver1 /* a patch in buf.h */
#define b_sc_link b_driver2 /* a patch in buf.h */
#include <sys/fcntl.h>
#include <sys/proc.h>
#include <vm/vm.h>
#include "scbus.h"
#include <scsi/scsi_all.h>
#include <scsi/scsiconf.h>
#include <sys/scsiio.h>
void scsierr(struct buf *, int); /* XXX ??? */
/*
* We let the user interpret his own sense in the generic scsi world.
* This routine is called at interrupt time if the SCSI_USER bit was set
* in the flags passed to scsi_scsi_cmd(). No other completion processing
* takes place, even if we are running over another device driver.
* The lower level routines that call us here, will free the xs and restart
* the device's queue if such exists.
*/
#ifndef min
#define min(A,B) ((A<B) ? A : B )
#endif
void scsi_user_done(xs)
struct scsi_xfer *xs;
{
struct buf *bp;
scsireq_t *screq;
bp = xs->bp;
if(!bp) { /* ALL user requests must have a buf */
sc_print_addr(xs->sc_link);
printf("User command with no buf\n");
return ;
}
screq = bp->b_screq;
if (!screq) { /* Is it one of ours? (the SCSI_USER bit says it is) */
sc_print_addr(xs->sc_link);
printf("User command with no request\n");
return ;
}
SC_DEBUG(xs->sc_link,SDEV_DB2,("user-done\n"));
screq->retsts = 0;
screq->status = xs->status;
switch((int)xs->error) {
case XS_NOERROR:
SC_DEBUG(xs->sc_link,SDEV_DB3,("no error\n"));
if (xs->flags & SCSI_RESID_VALID)
screq->datalen_used = xs->datalen - xs->resid;
else
screq->datalen_used = xs->datalen;
screq->retsts = SCCMD_OK;
break;
case XS_SENSE:
SC_DEBUG(xs->sc_link,SDEV_DB3,("have sense\n"));
screq->senselen_used = min(sizeof(xs->sense),SENSEBUFLEN);
bcopy(&xs->sense,screq->sense,screq->senselen);
screq->retsts = SCCMD_SENSE;
break;
case XS_DRIVER_STUFFUP:
sc_print_addr(xs->sc_link);
printf("host adapter code inconsistency\n");
screq->retsts = SCCMD_UNKNOWN;
break;
case XS_TIMEOUT:
SC_DEBUG(xs->sc_link,SDEV_DB3,("timeout\n"));
screq->retsts = SCCMD_TIMEOUT;
break;
case XS_BUSY:
SC_DEBUG(xs->sc_link,SDEV_DB3,("busy\n"));
screq->retsts = SCCMD_BUSY;
break;
default:
sc_print_addr(xs->sc_link);
printf("unknown error category from host adapter code\n");
screq->retsts = SCCMD_UNKNOWN;
break;
}
biodone(bp); /* we're waiting on it in scsistrategy() */
return; /* it'll free the xs and restart any queue */
}
/* Pseudo strategy function
* Called by scsi_do_ioctl() via physio/physstrat if there is to
* be data transfered, and directly if there is no data transfer.
*
* Can't be used with block devices or raw_read/raw_write directly
* from the cdevsw/bdevsw tables because they couldn't have added
* the screq structure. [JRE]
*/
void scsistrategy(struct buf *bp)
{
errval err;
struct scsi_link *sc_link = bp->b_sc_link;
scsireq_t *screq;
u_int32 flags = 0;
int s;
if(!sc_link) {
printf("user_strat: No link pointer\n");
scsierr(bp,EINVAL);
return;
}
SC_DEBUG(sc_link,SDEV_DB2,("user_strategy\n"));
screq = bp->b_screq;
if(!screq) {
sc_print_addr(sc_link);
printf("No request block\n");
scsierr(bp,EINVAL);
return;
}
/* We're in trouble if physio tried to break up the
* transfer:
*/
if (bp->b_bcount != screq->datalen) {
sc_print_addr(sc_link);
printf("physio split the request.. cannot proceed\n");
scsierr(bp, EIO);
return;
}
if (screq->timeout == 0) {
scsierr(bp, EINVAL);
return;
}
if (screq->cmdlen > sizeof(struct scsi_generic)) {
sc_print_addr(sc_link);
printf("cmdlen too big ");
scsierr(bp, EFAULT);
return;
}
if (screq->flags & SCCMD_READ)
flags |= SCSI_DATA_IN;
if (screq->flags & SCCMD_WRITE)
flags |= SCSI_DATA_OUT;
if (screq->flags & SCCMD_TARGET)
flags |= SCSI_TARGET;
if (screq->flags & SCCMD_ESCAPE)
flags |= SCSI_ESCAPE;
#ifdef BOUNCE_BUFFERS
if (sc_link->flags & SDEV_BOUNCE)
vm_bounce_alloc(bp);
#endif
err = scsi_scsi_cmd(sc_link,
(struct scsi_generic *)screq->cmd,
screq->cmdlen,
(u_char *)bp->b_un.b_addr,
screq->datalen,
0, /* user must do the retries *//* ignored */
screq->timeout,
bp,
flags | SCSI_USER);
/*because there is a bp, scsi_scsi_cmd will return immediatly*/
if (err)
{
scsierr(bp, err);
return;
}
SC_DEBUG(sc_link,SDEV_DB3,("about to sleep\n"));
s = splbio();
while(!(bp->b_flags & B_DONE))
{
tsleep((caddr_t)bp, PRIBIO, "scsistrat", 0);
}
splx(s);
SC_DEBUG(sc_link,SDEV_DB3,("back from sleep\n"));
return;
}
void scsiminphys(struct buf *bp)
{
/*XXX*//* call the adapter's minphys */
}
/*
* Something (e.g. another driver) has called us
* with an sc_link for a target/lun/adapter, and a scsi
* specific ioctl to perform, better try.
* If user-level type command, we must still be running
* in the context of the calling process
*/
errval scsi_do_ioctl(dev_t dev, int cmd, caddr_t addr, int flags,
struct proc *p, struct scsi_link *sc_link)
{
errval ret = 0;
/* If we can't write the device we can't permit much:
*/
if (cmd != SCIOCIDENTIFY && !(flags & FWRITE))
return EACCES;
SC_DEBUG(sc_link,SDEV_DB2,("scsi_do_ioctl(0x%x)\n",cmd));
switch(cmd)
{
case SCIOCCOMMAND:
{
/*
* You won't believe this, but the arg copied in
* from the user space, is on the kernel stack
* for this process, so we can't write
* to it at interrupt time..
* we need to copy it in and out!
* Make a static copy using malloc!
*/
scsireq_t *screq2 = (scsireq_t *)addr;
scsireq_t *screq = (scsireq_t *)addr;
int rwflag = (screq->flags & SCCMD_READ) ? B_READ : B_WRITE;
struct buf *bp;
caddr_t d_addr;
int len;
#if 0 /* XXX dufault@hda.com: This looks too rev dependent. Do it always? */
if((unsigned int)screq < (unsigned int)KERNBASE)
#endif
{
screq = malloc(sizeof(scsireq_t),M_TEMP,M_WAITOK);
bcopy(screq2,screq,sizeof(scsireq_t));
}
bp = malloc(sizeof (struct buf),M_TEMP,M_WAITOK);
bzero(bp,sizeof(struct buf));
d_addr = screq->databuf;
bp->b_bcount = len = screq->datalen;
bp->b_screq = screq;
bp->b_sc_link = sc_link;
if (len) {
struct uio auio;
struct iovec aiov;
long cnt;
aiov.iov_base = d_addr;
aiov.iov_len = len;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_resid = len;
if (auio.uio_resid < 0)
return (EINVAL);
auio.uio_rw = (rwflag == B_READ) ? UIO_READ : UIO_WRITE;
auio.uio_segflg = UIO_USERSPACE;
auio.uio_procp = curproc;
cnt = len;
ret = physio(scsistrategy, bp, dev, rwflag,
minphys, &auio);
} else {
/* if no data, no need to translate it.. */
bp->b_un.b_addr = 0;
bp->b_dev = dev;
bp->b_flags = 0;
scsistrategy(bp);
ret = bp->b_error;
}
free(bp,M_TEMP);
#if 0 /* XXX dufault@hda.com: This looks too rev dependent. Do it always? */
if((unsigned int)screq2 < (unsigned int)KERNBASE)
#endif
{
bcopy(screq,screq2,sizeof(scsireq_t));
free(screq,M_TEMP);
}
break;
}
case SCIOCDEBUG:
{
int level = *((int *)addr);
SC_DEBUG(sc_link,SDEV_DB3,("debug set to %d\n",level));
sc_link->flags &= ~SDEV_DBX; /*clear debug bits */
if(level & 1) sc_link->flags |= SDEV_DB1;
if(level & 2) sc_link->flags |= SDEV_DB2;
if(level & 4) sc_link->flags |= SDEV_DB3;
if(level & 8) sc_link->flags |= SDEV_DB4;
ret = 0;
break;
}
case SCIOCREPROBE:
{
struct scsi_addr *sca = (struct scsi_addr *) addr;
ret = scsi_probe_busses(sca->scbus,sca->target,sca->lun);
break;
}
case SCIOCRECONFIG:
case SCIOCDECONFIG:
ret = EINVAL;
break;
case SCIOCIDENTIFY:
{
struct scsi_addr *sca = (struct scsi_addr *) addr;
sca->scbus = sc_link->scsibus;
sca->target = sc_link->target;
sca->lun = sc_link->lun;
break;
}
default:
ret = ENOTTY;
break;
}
return ret;
}
void
scsierr(bp,err)
struct buf *bp;
int err;
{
bp->b_flags |= B_ERROR;
bp->b_error = err;
biodone(bp);
return;
}