423 lines
10 KiB
C
423 lines
10 KiB
C
/*
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* Copyright (c) 1994 Charles Hannum. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Charles Hannum.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $Id: scsipi_ioctl.c,v 1.4 1994/03/29 04:29:35 mycroft Exp $
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*/
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/*
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* Contributed by HD Associates (hd@world.std.com).
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* Copyright (c) 1992, 1993 HD Associates
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*
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* Berkeley style copyright.
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*/
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#include <sys/types.h>
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#include <sys/errno.h>
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#include <sys/param.h>
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#include <sys/malloc.h>
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#include <sys/buf.h>
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#include <sys/proc.h>
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#include <sys/device.h>
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#include <scsi/scsi_all.h>
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#include <scsi/scsiconf.h>
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#include <sys/scsiio.h>
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void scsierr __P((struct buf *, int));
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/*
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* We need to maintain an assocation between the buf and the SCSI request
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* structure. We do this with a simple array of scsi_ioctl structures below.
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* XXX The free structures should probably be in a linked list.
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*/
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#define NIOCTL 16
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struct scsi_ioctl {
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struct buf *si_bp;
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scsireq_t *si_screq;
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struct scsi_link *si_sc_link;
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} scsi_ioctl[NIOCTL];
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struct scsi_ioctl *
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si_get(bp)
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struct buf *bp;
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{
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int s = splbio();
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struct scsi_ioctl *si;
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int error;
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for (;;) {
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for (si = scsi_ioctl; si < &scsi_ioctl[NIOCTL]; si++)
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if (si->si_bp == 0) {
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si->si_bp = bp;
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splx(s);
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return si;
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}
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error = tsleep(scsi_ioctl, PRIBIO | PCATCH, "siget", 0);
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if (error) {
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splx(s);
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return 0;
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}
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}
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}
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void
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si_free(si)
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struct scsi_ioctl *si;
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{
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int s = splbio();
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si->si_bp = 0;
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wakeup(scsi_ioctl);
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splx(s);
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}
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struct scsi_ioctl *
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si_find(bp)
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struct buf *bp;
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{
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int s = splbio();
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struct scsi_ioctl *si;
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for (si = scsi_ioctl; si < &scsi_ioctl[NIOCTL]; si++)
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if (si->si_bp == bp) {
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splx(s);
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return si;
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}
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splx(s);
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return 0;
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}
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/*
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* We let the user interpret his own sense in the generic scsi world.
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* This routine is called at interrupt time if the SCSI_USER bit was set
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* in the flags passed to scsi_scsi_cmd(). No other completion processing
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* takes place, even if we are running over another device driver.
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* The lower level routines that call us here, will free the xs and restart
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* the device's queue if such exists.
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*/
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void
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scsi_user_done(xs)
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struct scsi_xfer *xs;
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{
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struct buf *bp;
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scsireq_t *screq;
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struct scsi_ioctl *si;
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bp = xs->bp;
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if (!bp) { /* ALL user requests must have a buf */
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sc_print_addr(xs->sc_link);
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printf("User command with no buf\n");
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return;
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}
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si = si_find(bp);
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if (!si) {
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sc_print_addr(xs->sc_link);
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printf("User command with no ioctl\n");
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return;
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}
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screq = si->si_screq;
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si_free(si);
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if (!screq) { /* Is it one of ours? (the SCSI_USER bit says it is) */
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sc_print_addr(xs->sc_link);
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printf("User command with no request\n");
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return;
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}
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SC_DEBUG(xs->sc_link, SDEV_DB2, ("user-done\n"));
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screq->retsts = 0;
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screq->status = xs->status;
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switch(xs->error) {
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case XS_NOERROR:
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SC_DEBUG(xs->sc_link, SDEV_DB3, ("no error\n"));
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screq->datalen_used = xs->datalen - xs->resid; /* probably rubbish */
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screq->retsts = SCCMD_OK;
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break;
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case XS_SENSE:
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SC_DEBUG(xs->sc_link, SDEV_DB3, ("have sense\n"));
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screq->senselen_used = min(sizeof(xs->sense), SENSEBUFLEN);
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bcopy(&xs->sense, screq->sense, screq->senselen);
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screq->retsts = SCCMD_SENSE;
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break;
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case XS_DRIVER_STUFFUP:
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sc_print_addr(xs->sc_link);
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printf("host adapter code inconsistency\n");
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screq->retsts = SCCMD_UNKNOWN;
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break;
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case XS_TIMEOUT:
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SC_DEBUG(xs->sc_link, SDEV_DB3, ("timeout\n"));
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screq->retsts = SCCMD_TIMEOUT;
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break;
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case XS_BUSY:
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SC_DEBUG(xs->sc_link, SDEV_DB3, ("busy\n"));
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screq->retsts = SCCMD_BUSY;
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break;
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default:
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sc_print_addr(xs->sc_link);
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printf("unknown error category from host adapter code\n");
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screq->retsts = SCCMD_UNKNOWN;
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break;
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}
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biodone(bp); /* we're waiting on it in scsi_strategy() */
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return; /* it'll free the xs and restart any queue */
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}
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/* Pseudo strategy function
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* Called by scsi_do_ioctl() via physio/physstrat if there is to
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* be data transfered, and directly if there is no data transfer.
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*
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* Should I reorganize this so it returns to physio instead
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* of sleeping in scsiio_scsi_cmd? Is there any advantage, other
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* than avoiding the probable duplicate wakeup in iodone? [PD]
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*
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* No, seems ok to me... [JRE]
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* (I don't see any duplicate wakeups)
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*
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* Can't be used with block devices or raw_read/raw_write directly
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* from the cdevsw/bdevsw tables because they couldn't have added
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* the screq structure. [JRE]
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*/
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void
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scsistrategy(bp)
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struct buf *bp;
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{
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int err;
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struct scsi_ioctl *si;
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scsireq_t *screq;
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struct scsi_link *sc_link;
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u_int32 flags = 0;
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int s;
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si = si_find(bp);
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if (!si) {
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printf("user_strat: No ioctl\n");
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scsierr(bp, EINVAL);
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return;
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}
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screq = si->si_screq;
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sc_link = si->si_sc_link;
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si_free(si);
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if (!sc_link) {
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printf("user_strat: No link pointer\n");
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scsierr(bp, EINVAL);
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return;
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}
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SC_DEBUG(sc_link, SDEV_DB2, ("user_strategy\n"));
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if (!screq) {
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sc_print_addr(sc_link);
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printf("No request block\n");
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scsierr(bp, EINVAL);
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return;
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}
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/*
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* We're in trouble if physio tried to break up the transfer.
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*/
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if (bp->b_bcount != screq->datalen) {
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sc_print_addr(sc_link);
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printf("physio split the request.. cannot proceed\n");
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scsierr(bp, EIO);
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return;
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}
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if (screq->timeout == 0) {
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scsierr(bp, EINVAL);
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return;
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}
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if (screq->cmdlen > sizeof(struct scsi_generic)) {
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sc_print_addr(sc_link);
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printf("cmdlen too big\n");
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scsierr(bp, EFAULT);
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return;
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}
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if (screq->flags & SCCMD_READ)
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flags |= SCSI_DATA_IN;
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if (screq->flags & SCCMD_WRITE)
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flags |= SCSI_DATA_OUT;
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if (screq->flags & SCCMD_TARGET)
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flags |= SCSI_TARGET;
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if (screq->flags & SCCMD_ESCAPE)
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flags |= SCSI_ESCAPE;
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err = scsi_scsi_cmd(sc_link, (struct scsi_generic *)screq->cmd,
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screq->cmdlen, (u_char *)bp->b_un.b_addr, screq->datalen,
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0, /* user must do the retries *//* ignored */
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screq->timeout, bp, flags | SCSI_USER);
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/* because there is a bp, scsi_scsi_cmd will return immediatly */
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if (err) {
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scsierr(bp, err);
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return;
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}
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SC_DEBUG(sc_link, SDEV_DB3, ("about to sleep\n"));
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s = splbio();
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while (!(bp->b_flags & B_DONE))
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tsleep(bp, PRIBIO, "scistr", 0);
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splx(s);
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SC_DEBUG(sc_link, SDEV_DB3, ("back from sleep\n"));
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return;
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}
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void
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scsiminphys(bp)
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struct buf *bp;
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{
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/*XXX*//* call the adapter's minphys */
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}
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/*
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* Something (e.g. another driver) has called us
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* with an sc_link for a target/lun/adapter, and a scsi
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* specific ioctl to perform, better try.
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* If user-level type command, we must still be running
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* in the context of the calling process
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*/
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int
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scsi_do_ioctl(sc_link, cmd, addr, f)
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struct scsi_link *sc_link;
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int cmd;
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caddr_t addr;
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int f;
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{
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int error;
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SC_DEBUG(sc_link, SDEV_DB2, ("scsi_do_ioctl(0x%x)\n", cmd));
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switch(cmd) {
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#ifdef notyet /* XXXX Needs to be redone to use copyin/out! */
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case SCIOCCOMMAND: {
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/*
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* You won't believe this, but the arg copied in
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* from the user space, is on the kernel stack
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* for this process, so we can't write
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* to it at interrupt time..
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* we need to copy it in and out!
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* Make a static copy using malloc!
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*/
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scsireq_t *screq2 = (scsireq_t *)addr;
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scsireq_t *screq = (scsireq_t *)addr;
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int rwflag = (screq->flags & SCCMD_READ) ? B_READ : B_WRITE;
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struct buf *bp;
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caddr_t d_addr;
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int len;
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if ((unsigned int)screq < KERNBASE) {
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screq = malloc(sizeof(scsireq_t), M_TEMP, M_WAITOK);
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bcopy(screq2, screq, sizeof(scsireq_t));
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}
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bp = malloc(sizeof(struct buf), M_TEMP, M_WAITOK);
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bzero(bp, sizeof(struct buf));
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d_addr = screq->databuf;
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bp->b_bcount = len = screq->datalen;
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si = si_get(bp);
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if (!si) {
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scsierr(bp, EINTR);
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return EINTR;
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}
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si->si_screq = screq;
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si->si_sc_link = sc_link;
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if (len) {
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#ifdef __NetBSD__
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#error "dev, mincntfn & uio need defining"
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error = physio(scsistrategy, bp, dev, rwflag,
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mincntfn, uio);
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#else
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error = physio(scsistrategy, 0, bp, 0, rwflag, d_addr,
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&len, curproc);
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#endif
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} else {
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/* if no data, no need to translate it.. */
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bp->b_un.b_addr = 0;
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bp->b_dev = -1; /* irrelevant info */
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bp->b_flags = 0;
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scsistrategy(bp);
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error = bp->b_error;
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}
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free(bp, M_TEMP);
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if ((unsigned int)screq2 < KERNBASE) {
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bcopy(screq, screq2, sizeof(scsireq_t));
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free(screq, M_TEMP);
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}
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return error;
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}
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#endif
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case SCIOCDEBUG: {
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int level = *((int *)addr);
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SC_DEBUG(sc_link, SDEV_DB3, ("debug set to %d\n", level));
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sc_link->flags &= ~SDEV_DBX; /* clear debug bits */
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if (level & 1)
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sc_link->flags |= SDEV_DB1;
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if (level & 2)
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sc_link->flags |= SDEV_DB2;
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if (level & 4)
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sc_link->flags |= SDEV_DB3;
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if (level & 8)
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sc_link->flags |= SDEV_DB4;
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return 0;
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}
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case SCIOCREPROBE: {
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struct scsi_addr *sca = (struct scsi_addr *)addr;
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return scsi_probe_busses(sca->scbus, sca->target, sca->lun);
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}
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case SCIOCRECONFIG:
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case SCIOCDECONFIG:
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return EINVAL;
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case SCIOCIDENTIFY: {
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struct scsi_addr *sca = (struct scsi_addr *)addr;
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sca->scbus = sc_link->scsibus;
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sca->target = sc_link->target;
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sca->lun = sc_link->lun;
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return 0;
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}
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default:
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return ENOTTY;
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}
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#ifdef DIAGNOSTIC
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panic("scsi_do_ioctl: impossible");
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#endif
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}
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void
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scsierr(bp, error)
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struct buf *bp;
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int error;
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{
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bp->b_flags |= B_ERROR;
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bp->b_error = error;
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biodone(bp);
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return;
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}
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