f7ea2f55d1
There is only cdevsw (which should be renamed in a later edit to deventry or something). cdevsw contains the union of what were in both bdevsw an cdevsw entries. The bdevsw[] table stiff exists and is a second pointer to the cdevsw entry of the device. it's major is in d_bmaj rather than d_maj. some cleanup still to happen (e.g. dsopen now gets two pointers to the same cdevsw struct instead of one to a bdevsw and one to a cdevsw). rawread()/rawwrite() went away as part of this though it's not strictly the same patch, just that it involves all the same lines in the drivers. cdroms no longer have write() entries (they did have rawwrite (?)). tapes no longer have support for bdev operations. Reviewed by: Eivind Eklund and Mike Smith Changes suggested by eivind.
327 lines
8.0 KiB
C
327 lines
8.0 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 1.28 1998/06/17 14:13:14 bde Exp $
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*/
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#include "opt_bounce.h"
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#include "opt_devfs.h"
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#include "opt_scsi.h"
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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/conf.h>
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#include <sys/kernel.h>
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#ifdef DEVFS
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#include <sys/devfsext.h>
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#endif /*DEVFS*/
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#include <scsi/scsiconf.h>
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#include <scsi/scsi_debug.h>
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#include <scsi/scsi_driver.h>
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#include "ioconf.h"
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struct scsi_data {
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struct buf_queue_head buf_queue;
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#ifdef DEVFS
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void *devfs_data_tok;
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void *devfs_ctl_tok;
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#endif
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};
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static d_open_t ptopen;
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static d_read_t ptread;
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static d_write_t ptwrite;
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static d_close_t ptclose;
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static d_ioctl_t ptioctl;
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static d_strategy_t ptstrategy;
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#define CDEV_MAJOR 61
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static struct cdevsw pt_cdevsw =
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{ ptopen, ptclose, ptread, ptwrite, /*61*/
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ptioctl, nostop, nullreset, nodevtotty,/* pt */
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seltrue, nommap, ptstrategy, "pt", NULL, -1 };
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SCSI_DEVICE_ENTRIES(pt)
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static void ptstart(u_int32_t unit, u_int32_t flags);
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static void pt_strategy(struct buf *bp, struct scsi_link *sc_link);
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static int pt_sense(struct scsi_xfer *scsi_xfer);
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static 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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ptattach,
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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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static errval
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ptattach(struct scsi_link *sc_link)
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{
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struct scsi_data *pt = sc_link->sd;
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bufq_init(&pt->buf_queue);
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#ifdef DEVFS
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pt->devfs_data_tok = devfs_add_devswf(&pt_cdevsw,
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sc_link->dev_unit,
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DV_CHR,
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UID_ROOT, GID_WHEEL, 0600,
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"pt%d", sc_link->dev_unit);
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pt->devfs_ctl_tok = devfs_add_devswf(&pt_cdevsw,
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sc_link->dev_unit | SCSI_CONTROL_MASK,
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DV_CHR,
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UID_ROOT, GID_WHEEL, 0600,
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"pt%d.ctl", sc_link->dev_unit);
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#endif
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return 0;
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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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static void
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ptstart(unit, flags)
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u_int32_t unit;
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u_int32_t 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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bp = bufq_first(&pt->buf_queue);
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if (bp == NULL) { /* yes, an assign */
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return;
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}
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bufq_remove(&pt->buf_queue, bp);
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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_data,
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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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static int
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ptread( dev_t dev, struct uio *uio, int ioflag)
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{
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return (physio(ptstrategy, NULL, dev, 1, minphys, uio));
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}
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static int
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ptwrite ( dev_t dev, struct uio *uio, int ioflag)
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{
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return (physio(ptstrategy, NULL, dev, 0, minphys, uio));
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}
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static void
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pt_strategy(struct buf *bp, struct scsi_link *sc_link)
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{
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unsigned char unit;
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u_int32_t 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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bufq_insert_tail(&pt->buf_queue, bp);
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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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static int
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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_t *) 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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static pt_devsw_installed = 0;
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static void
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pt_drvinit(void *unused)
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{
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dev_t dev;
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if ( ! pt_devsw_installed ) {
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dev = makedev(CDEV_MAJOR, 0);
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cdevsw_add(&dev,&pt_cdevsw, NULL);
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pt_devsw_installed = 1;
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}
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}
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SYSINIT(ptdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,pt_drvinit,NULL)
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