255 lines
6.5 KiB
C
255 lines
6.5 KiB
C
/*
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* pt: Processor Type driver.
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*
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* Copyright (C) 1995, HD Associates, Inc.
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* PO Box 276
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* Pepperell, MA 01463
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* 508 433 5266
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* dufault@hda.com
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*
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* This code is contributed to the University of California at Berkeley:
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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 the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: pt.c,v 1.4 1995/05/03 18:09:09 dufault Exp $
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*/
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/*
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* XXX dufault@hda.com: We need the "kern devconf" stuff, but I'm not
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* going to add it until it is done in a simple way that provides
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* base behavior in scsi_driver.c
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/buf.h>
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#include <sys/proc.h>
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#include <scsi/scsi_all.h>
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#include <scsi/scsiconf.h>
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struct scsi_data {
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struct buf *buf_queue; /* the queue of pending IO operations */
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};
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void ptstart(u_int32 unit, u_int32 flags);
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void pt_strategy(struct buf *bp, struct scsi_link *sc_link);
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int pt_sense(struct scsi_xfer *scsi_xfer);
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SCSI_DEVICE_ENTRIES(pt)
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struct scsi_device pt_switch =
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{
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pt_sense,
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ptstart, /* we have a queue, and this is how we service it */
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NULL,
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NULL,
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"pt",
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0,
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{0, 0},
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SDEV_ONCE_ONLY, /* Only one open allowed */
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0,
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"Processor",
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ptopen,
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sizeof(struct scsi_data),
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T_PROCESSOR,
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0,
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0,
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0,
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0,
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0,
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pt_strategy,
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};
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/*
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* ptstart looks to see if there is a buf waiting for the device
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* and that the device is not already busy. If both are true,
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* It dequeues the buf and creates a scsi command to perform the
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* transfer required. The transfer request will call scsi_done
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* on completion, which will in turn call this routine again
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* so that the next queued transfer is performed.
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* The bufs are queued by the strategy routine (ptstrategy)
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*
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* This routine is also called after other non-queued requests
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* have been made of the scsi driver, to ensure that the queue
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* continues to be drained.
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* ptstart() is called at splbio
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*/
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void
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ptstart(unit, flags)
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u_int32 unit;
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u_int32 flags;
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{
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struct scsi_link *sc_link = SCSI_LINK(&pt_switch, unit);
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struct scsi_data *pt = sc_link->sd;
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register struct buf *bp = 0;
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struct
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{
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#define PROCESSOR_SEND 0x0A
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#define PROCESSOR_RECEIVE 0x08
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u_char op_code;
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u_char byte2;
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u_char len[3];
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u_char control;
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} cmd;
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SC_DEBUG(sc_link, SDEV_DB2, ("ptstart "));
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/*
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* See if there is a buf to do and we are not already
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* doing one
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*/
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while (sc_link->opennings != 0) {
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/* if a special awaits, let it proceed first */
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if (sc_link->flags & SDEV_WAITING) {
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sc_link->flags &= ~SDEV_WAITING;
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wakeup((caddr_t)sc_link);
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return;
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}
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if ((bp = pt->buf_queue) == NULL) {
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return; /* no work to bother with */
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}
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pt->buf_queue = bp->b_actf;
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/*
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* Fill out the scsi command
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*/
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bzero(&cmd, sizeof(cmd));
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if ((bp->b_flags & B_READ) == B_WRITE) {
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cmd.op_code = PROCESSOR_SEND;
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flags |= SCSI_DATA_OUT;
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} else {
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cmd.op_code = PROCESSOR_RECEIVE;
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flags |= SCSI_DATA_IN;
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}
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scsi_uto3b(bp->b_bcount, cmd.len);
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/*
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* go ask the adapter to do all this for us
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*/
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if (scsi_scsi_cmd(sc_link,
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(struct scsi_generic *) &cmd,
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sizeof(cmd),
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(u_char *) bp->b_un.b_addr,
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bp->b_bcount,
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0,
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10000,
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bp,
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flags) == SUCCESSFULLY_QUEUED) {
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} else {
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printf("pt%ld: oops not queued\n", unit);
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bp->b_flags |= B_ERROR;
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bp->b_error = EIO;
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biodone(bp);
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}
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} /* go back and see if we can cram more work in.. */
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}
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void
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pt_strategy(struct buf *bp, struct scsi_link *sc_link)
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{
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struct buf **dp;
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unsigned char unit;
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u_int32 opri;
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struct scsi_data *pt;
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unit = minor((bp->b_dev));
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pt = sc_link->sd;
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opri = splbio();
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/*
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* Use a bounce buffer if necessary
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*/
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#ifdef BOUNCE_BUFFERS
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if (sc_link->flags & SDEV_BOUNCE)
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vm_bounce_alloc(bp);
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#endif
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/*
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* Place it in the queue of activities for this tape
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* at the end (a bit silly because we only have one user..
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* (but it could fork() ))
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*/
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dp = &(pt->buf_queue);
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while (*dp) {
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dp = &((*dp)->b_actf);
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}
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*dp = bp;
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bp->b_actf = NULL;
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/*
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* Tell the device to get going on the transfer if it's
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* not doing anything, otherwise just wait for completion
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* (All a bit silly if we're only allowing 1 open but..)
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*/
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ptstart(unit, 0);
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splx(opri);
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return;
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}
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/*
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* sense handler: Called to determine what to do when the
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* device returns a CHECK CONDITION.
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*
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* For the processor type devices we try to handle the "info" field.
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*/
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int pt_sense(struct scsi_xfer *xs)
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{
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struct scsi_sense_data *sense = &(xs->sense);
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struct buf *bp;
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long resid;
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if ((sense->error_code & SSD_ERRCODE_VALID) == 0 ||
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(sense->ext.extended.flags & SSD_ILI) == 0) {
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return SCSIRET_CONTINUE; /* let the default handler handle it */
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}
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resid = ntohl(*((int32 *) sense->ext.extended.info));
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bp = xs->bp;
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if (resid < 0) {
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/* It synthesized data in order to fill our request.
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* Move resid back to cover this.
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*/
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xs->resid = -resid;
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xs->flags |= SCSI_RESID_VALID;
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return 0;
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}
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else {
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/* It wanted to send more data. We can't really do anything
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* about this.
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*/
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return SCSIRET_CONTINUE;
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}
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}
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