freebsd-dev/sys/scsi/sctarg.c
1997-09-02 20:06:59 +00:00

291 lines
7.5 KiB
C

/*
* sctarg: Target mode user interface
*
* 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.
*
* $Id: sctarg.c,v 1.20 1997/03/23 06:33:51 bde Exp $
*/
#include "opt_bounce.h"
#include "opt_scsi.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/buf.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#ifdef DEVFS
#include <sys/devfsext.h>
#endif /*DEVFS*/
#include <scsi/scsiconf.h>
#include <scsi/scsi_debug.h>
#include <scsi/scsi_driver.h>
#define OPEN 0x01
struct scsi_data {
struct buf_queue_head buf_queue;
int flags; /* Already open */
};
static d_open_t sctargopen;
static d_close_t sctargclose;
static d_ioctl_t sctargioctl;
static d_strategy_t sctargstrategy;
#define CDEV_MAJOR 65
static struct cdevsw sctarg_cdevsw =
{ sctargopen, sctargclose, rawread, rawwrite, /*65*/
sctargioctl, nostop, nullreset, nodevtotty,/* sctarg */
seltrue, nommap, sctargstrategy, "sctarg", NULL, -1 };
SCSI_DEVICE_ENTRIES(sctarg)
static errval sctarg_open(dev_t dev, int flags, int fmt, struct proc *p,
struct scsi_link *sc_link);
static void sctargstart(u_int32_t unit, u_int32_t unused_flags);
static void sctarg_strategy(struct buf *bp, struct scsi_link *sc_link);
static struct scsi_device sctarg_switch =
{
NULL,
sctargstart, /* we have a queue, and this is how we service it */
NULL,
NULL,
"sctarg",
0,
{0, 0},
SDEV_ONCE_ONLY,
0,
"Processor Target",
sctargopen,
sizeof(struct scsi_data),
T_TARGET,
0,
0,
sctarg_open,
0,
0,
sctarg_strategy,
};
static errval
sctarg_open(dev_t dev, int flags, int fmt, struct proc *p,
struct scsi_link *sc_link)
{
int ret = 0;
/* Does this host adapter support target mode operation?
*/
if ((sc_link->flags & SDEV_TARGET_OPS) == 0)
return ENODEV; /* Operation not supported */
if (SCSI_FIXED(dev)) {
sc_link->scsibus = SCSI_BUS(dev);
scsi_set_bus(sc_link->scsibus, sc_link);
sc_link->target = SCSI_ID(dev);
sc_link->lun = SCSI_LUN(dev);
}
if (sc_link->scsibus == SCCONF_UNSPEC ||
sc_link->target == SCCONF_UNSPEC ||
sc_link->lun == SCCONF_UNSPEC)
return ENXIO;
/* XXX: You can have more than one target device on a single
* host adapter. We need a reference count.
*/
if ((sc_link->sd->flags & OPEN) == 0) /* Enable target mode */
{
ret = scsi_target_mode(sc_link, 1);
sc_link->sd->flags |= OPEN;
}
return ret;
}
/*
* sctargstart looks to see if there is a buf waiting for the device
* and that the device is not already busy. If both are true,
* It dequeues the buf and creates a scsi command to perform the
* transfer required. The transfer request will call scsi_done
* on completion, which will in turn call this routine again
* so that the next queued transfer is performed.
* The bufs are queued by the strategy routine (sctargstrategy)
*
* This routine is also called after other non-queued requests
* have been made of the scsi driver, to ensure that the queue
* continues to be drained.
* sctargstart() is called at splbio
*/
static void
sctargstart(unit, unused_flags)
u_int32_t unit;
u_int32_t unused_flags;
{
struct scsi_link *sc_link = SCSI_LINK(&sctarg_switch, unit);
struct scsi_data *sctarg = sc_link->sd;
register struct buf *bp = 0;
struct
{
#define PROCESSOR_SEND 0x0A
#define PROCESSOR_RECEIVE 0x08
u_char op_code;
u_char byte2;
u_char len[3];
u_char control;
} cmd;
u_int32_t flags;
SC_DEBUG(sc_link, SDEV_DB2, ("sctargstart "));
/*
* See if there is a buf to do and we are not already
* doing one
*/
while (sc_link->opennings != 0) {
/* if a special awaits, let it proceed first */
if (sc_link->flags & SDEV_WAITING) {
sc_link->flags &= ~SDEV_WAITING;
wakeup((caddr_t)sc_link);
return;
}
bp = sctarg->buf_queue.tqh_first;
if (bp == NULL)
return;
TAILQ_REMOVE(&sctarg->buf_queue, bp, b_act);
/*
* Fill out the scsi command
*/
bzero(&cmd, sizeof(cmd));
flags = SCSI_TARGET;
if ((bp->b_flags & B_READ) == B_WRITE) {
cmd.op_code = PROCESSOR_SEND;
flags |= SCSI_DATA_OUT;
} else {
cmd.op_code = PROCESSOR_RECEIVE;
flags |= SCSI_DATA_IN;
}
scsi_uto3b(bp->b_bcount, cmd.len);
/*
* go ask the adapter to do all this for us
*/
if (scsi_scsi_cmd(sc_link,
(struct scsi_generic *) &cmd,
sizeof(cmd),
(u_char *) bp->b_un.b_addr,
bp->b_bcount,
0,
100000,
bp,
flags | SCSI_NOSLEEP) == SUCCESSFULLY_QUEUED) {
} else {
printf("sctarg%ld: oops not queued\n", unit);
bp->b_flags |= B_ERROR;
bp->b_error = EIO;
biodone(bp);
}
} /* go back and see if we can cram more work in.. */
}
static void
sctarg_strategy(struct buf *bp, struct scsi_link *sc_link)
{
unsigned char unit;
u_int32_t opri;
struct scsi_data *sctarg;
unit = minor((bp->b_dev));
sctarg = sc_link->sd;
opri = splbio();
/*
* Use a bounce buffer if necessary
*/
#ifdef BOUNCE_BUFFERS
if (sc_link->flags & SDEV_BOUNCE)
vm_bounce_alloc(bp);
#endif
/*
* Place it at the end of the queue of activities for this device.
*/
TAILQ_INSERT_TAIL( &sctarg->buf_queue, bp, b_act);
/*
* Tell the device to get going on the transfer if it's
* not doing anything, otherwise just wait for completion
* (All a bit silly if we're only allowing 1 open but..)
*/
sctargstart(unit, 0);
splx(opri);
return;
}
static sctarg_devsw_installed = 0;
#ifdef DEVFS
static void *sctarg_devfs_token;
#endif
static void sctarg_drvinit(void *unused)
{
dev_t dev;
if( ! sctarg_devsw_installed ) {
dev = makedev(CDEV_MAJOR, 0);
cdevsw_add(&dev,&sctarg_cdevsw, NULL);
sctarg_devsw_installed = 1;
#ifdef DEVFS
/* XXX should be in ADAPTER code */
sctarg_devfs_token =
devfs_add_devswf(&sctarg_cdevsw, 0, DV_CHR, 0, 0,
0600, "sctarg");
#endif
}
}
SYSINIT(sctargdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,sctarg_drvinit,NULL)