scsi_pt.c revision 111815 
1/*
2 * Implementation of SCSI Processor Target Peripheral driver for CAM.
3 *
4 * Copyright (c) 1998 Justin T. Gibbs.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions, and the following disclaimer,
12 *    without modification, immediately at the beginning of the file.
13 * 2. The name of the author may not be used to endorse or promote products
14 *    derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
20 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 * $FreeBSD: head/sys/cam/scsi/scsi_pt.c 111815 2003-03-03 12:15:54Z phk $
29 */
30
31#include <sys/param.h>
32#include <sys/queue.h>
33#include <sys/systm.h>
34#include <sys/kernel.h>
35#include <sys/types.h>
36#include <sys/bio.h>
37#include <sys/devicestat.h>
38#include <sys/malloc.h>
39#include <sys/conf.h>
40#include <sys/ptio.h>
41
42#include <cam/cam.h>
43#include <cam/cam_ccb.h>
44#include <cam/cam_periph.h>
45#include <cam/cam_xpt_periph.h>
46#include <cam/cam_debug.h>
47
48#include <cam/scsi/scsi_all.h>
49#include <cam/scsi/scsi_message.h>
50#include <cam/scsi/scsi_pt.h>
51
52#include "opt_pt.h"
53
54typedef enum {
55	PT_STATE_PROBE,
56	PT_STATE_NORMAL
57} pt_state;
58
59typedef enum {
60	PT_FLAG_NONE		= 0x00,
61	PT_FLAG_OPEN		= 0x01,
62	PT_FLAG_DEVICE_INVALID	= 0x02,
63	PT_FLAG_RETRY_UA	= 0x04
64} pt_flags;
65
66typedef enum {
67	PT_CCB_BUFFER_IO	= 0x01,
68	PT_CCB_WAITING		= 0x02,
69	PT_CCB_RETRY_UA		= 0x04,
70	PT_CCB_BUFFER_IO_UA	= PT_CCB_BUFFER_IO|PT_CCB_RETRY_UA
71} pt_ccb_state;
72
73/* Offsets into our private area for storing information */
74#define ccb_state	ppriv_field0
75#define ccb_bp		ppriv_ptr1
76
77struct pt_softc {
78	struct	 bio_queue_head bio_queue;
79	struct	 devstat device_stats;
80	LIST_HEAD(, ccb_hdr) pending_ccbs;
81	pt_state state;
82	pt_flags flags;
83	union	 ccb saved_ccb;
84	int	 io_timeout;
85	dev_t	 dev;
86};
87
88static	d_open_t	ptopen;
89static	d_close_t	ptclose;
90static	d_strategy_t	ptstrategy;
91static	periph_init_t	ptinit;
92static	void		ptasync(void *callback_arg, u_int32_t code,
93				struct cam_path *path, void *arg);
94static	periph_ctor_t	ptctor;
95static	periph_oninv_t	ptoninvalidate;
96static	periph_dtor_t	ptdtor;
97static	periph_start_t	ptstart;
98static	void		ptdone(struct cam_periph *periph,
99			       union ccb *done_ccb);
100static	d_ioctl_t	ptioctl;
101static  int		pterror(union ccb *ccb, u_int32_t cam_flags,
102				u_int32_t sense_flags);
103
104void	scsi_send_receive(struct ccb_scsiio *csio, u_int32_t retries,
105			  void (*cbfcnp)(struct cam_periph *, union ccb *),
106			  u_int tag_action, int readop, u_int byte2,
107			  u_int32_t xfer_len, u_int8_t *data_ptr,
108			  u_int8_t sense_len, u_int32_t timeout);
109
110static struct periph_driver ptdriver =
111{
112	ptinit, "pt",
113	TAILQ_HEAD_INITIALIZER(ptdriver.units), /* generation */ 0
114};
115
116PERIPHDRIVER_DECLARE(pt, ptdriver);
117
118#define PT_CDEV_MAJOR 61
119
120static struct cdevsw pt_cdevsw = {
121	.d_open =	ptopen,
122	.d_close =	ptclose,
123	.d_read =	physread,
124	.d_write =	physwrite,
125	.d_ioctl =	ptioctl,
126	.d_strategy =	ptstrategy,
127	.d_name =	"pt",
128	.d_maj =	PT_CDEV_MAJOR,
129};
130
131#ifndef SCSI_PT_DEFAULT_TIMEOUT
132#define SCSI_PT_DEFAULT_TIMEOUT		60
133#endif
134
135static int
136ptopen(dev_t dev, int flags, int fmt, struct thread *td)
137{
138	struct cam_periph *periph;
139	struct pt_softc *softc;
140	int unit;
141	int error;
142	int s;
143
144	unit = minor(dev);
145	periph = (struct cam_periph *)dev->si_drv1;
146	if (periph == NULL)
147		return (ENXIO);
148
149	softc = (struct pt_softc *)periph->softc;
150
151	s = splsoftcam();
152	if (softc->flags & PT_FLAG_DEVICE_INVALID) {
153		splx(s);
154		return(ENXIO);
155	}
156
157	CAM_DEBUG(periph->path, CAM_DEBUG_TRACE,
158	    ("ptopen: dev=%s (unit %d)\n", devtoname(dev), unit));
159
160	if ((error = cam_periph_lock(periph, PRIBIO|PCATCH)) != 0) {
161		splx(s);
162		return (error); /* error code from tsleep */
163	}
164
165	splx(s);
166
167	if ((softc->flags & PT_FLAG_OPEN) == 0) {
168		if (cam_periph_acquire(periph) != CAM_REQ_CMP)
169			error = ENXIO;
170		else
171			softc->flags |= PT_FLAG_OPEN;
172	} else
173		error = EBUSY;
174
175	cam_periph_unlock(periph);
176	return (error);
177}
178
179static int
180ptclose(dev_t dev, int flag, int fmt, struct thread *td)
181{
182	struct	cam_periph *periph;
183	struct	pt_softc *softc;
184	int	error;
185
186	periph = (struct cam_periph *)dev->si_drv1;
187	if (periph == NULL)
188		return (ENXIO);
189
190	softc = (struct pt_softc *)periph->softc;
191
192	if ((error = cam_periph_lock(periph, PRIBIO)) != 0)
193		return (error); /* error code from tsleep */
194
195	softc->flags &= ~PT_FLAG_OPEN;
196	cam_periph_unlock(periph);
197	cam_periph_release(periph);
198	return (0);
199}
200
201/*
202 * Actually translate the requested transfer into one the physical driver
203 * can understand.  The transfer is described by a buf and will include
204 * only one physical transfer.
205 */
206static void
207ptstrategy(struct bio *bp)
208{
209	struct cam_periph *periph;
210	struct pt_softc *softc;
211	int    s;
212
213	periph = (struct cam_periph *)bp->bio_dev->si_drv1;
214	bp->bio_resid = bp->bio_bcount;
215	if (periph == NULL) {
216		biofinish(bp, NULL, ENXIO);
217		return;
218	}
219	softc = (struct pt_softc *)periph->softc;
220
221	/*
222	 * Mask interrupts so that the pack cannot be invalidated until
223	 * after we are in the queue.  Otherwise, we might not properly
224	 * clean up one of the buffers.
225	 */
226	s = splbio();
227
228	/*
229	 * If the device has been made invalid, error out
230	 */
231	if ((softc->flags & PT_FLAG_DEVICE_INVALID)) {
232		splx(s);
233		biofinish(bp, NULL, ENXIO);
234		return;
235	}
236
237	/*
238	 * Place it in the queue of disk activities for this disk
239	 */
240	bioq_insert_tail(&softc->bio_queue, bp);
241
242	splx(s);
243
244	/*
245	 * Schedule ourselves for performing the work.
246	 */
247	xpt_schedule(periph, /* XXX priority */1);
248
249	return;
250}
251
252static void
253ptinit(void)
254{
255	cam_status status;
256	struct cam_path *path;
257
258	/*
259	 * Install a global async callback.  This callback will
260	 * receive async callbacks like "new device found".
261	 */
262	status = xpt_create_path(&path, /*periph*/NULL, CAM_XPT_PATH_ID,
263				 CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD);
264
265	if (status == CAM_REQ_CMP) {
266		struct ccb_setasync csa;
267
268                xpt_setup_ccb(&csa.ccb_h, path, /*priority*/5);
269                csa.ccb_h.func_code = XPT_SASYNC_CB;
270                csa.event_enable = AC_FOUND_DEVICE;
271                csa.callback = ptasync;
272                csa.callback_arg = NULL;
273                xpt_action((union ccb *)&csa);
274		status = csa.ccb_h.status;
275                xpt_free_path(path);
276        }
277
278	if (status != CAM_REQ_CMP) {
279		printf("pt: Failed to attach master async callback "
280		       "due to status 0x%x!\n", status);
281	}
282}
283
284static cam_status
285ptctor(struct cam_periph *periph, void *arg)
286{
287	struct pt_softc *softc;
288	struct ccb_setasync csa;
289	struct ccb_getdev *cgd;
290
291	cgd = (struct ccb_getdev *)arg;
292	if (periph == NULL) {
293		printf("ptregister: periph was NULL!!\n");
294		return(CAM_REQ_CMP_ERR);
295	}
296
297	if (cgd == NULL) {
298		printf("ptregister: no getdev CCB, can't register device\n");
299		return(CAM_REQ_CMP_ERR);
300	}
301
302	softc = (struct pt_softc *)malloc(sizeof(*softc),M_DEVBUF,M_NOWAIT);
303
304	if (softc == NULL) {
305		printf("daregister: Unable to probe new device. "
306		       "Unable to allocate softc\n");
307		return(CAM_REQ_CMP_ERR);
308	}
309
310	bzero(softc, sizeof(*softc));
311	LIST_INIT(&softc->pending_ccbs);
312	softc->state = PT_STATE_NORMAL;
313	bioq_init(&softc->bio_queue);
314
315	softc->io_timeout = SCSI_PT_DEFAULT_TIMEOUT * 1000;
316
317	periph->softc = softc;
318
319	devstat_add_entry(&softc->device_stats, "pt",
320			  periph->unit_number, 0,
321			  DEVSTAT_NO_BLOCKSIZE,
322			  SID_TYPE(&cgd->inq_data) | DEVSTAT_TYPE_IF_SCSI,
323			  DEVSTAT_PRIORITY_OTHER);
324
325	softc->dev = make_dev(&pt_cdevsw, periph->unit_number, UID_ROOT,
326			      GID_OPERATOR, 0600, "%s%d", periph->periph_name,
327			      periph->unit_number);
328	softc->dev->si_drv1 = periph;
329
330	/*
331	 * Add async callbacks for bus reset and
332	 * bus device reset calls.  I don't bother
333	 * checking if this fails as, in most cases,
334	 * the system will function just fine without
335	 * them and the only alternative would be to
336	 * not attach the device on failure.
337	 */
338	xpt_setup_ccb(&csa.ccb_h, periph->path, /*priority*/5);
339	csa.ccb_h.func_code = XPT_SASYNC_CB;
340	csa.event_enable = AC_SENT_BDR | AC_BUS_RESET | AC_LOST_DEVICE;
341	csa.callback = ptasync;
342	csa.callback_arg = periph;
343	xpt_action((union ccb *)&csa);
344
345	/* Tell the user we've attached to the device */
346	xpt_announce_periph(periph, NULL);
347
348	return(CAM_REQ_CMP);
349}
350
351static void
352ptoninvalidate(struct cam_periph *periph)
353{
354	int s;
355	struct pt_softc *softc;
356	struct bio *q_bp;
357	struct ccb_setasync csa;
358
359	softc = (struct pt_softc *)periph->softc;
360
361	/*
362	 * De-register any async callbacks.
363	 */
364	xpt_setup_ccb(&csa.ccb_h, periph->path,
365		      /* priority */ 5);
366	csa.ccb_h.func_code = XPT_SASYNC_CB;
367	csa.event_enable = 0;
368	csa.callback = ptasync;
369	csa.callback_arg = periph;
370	xpt_action((union ccb *)&csa);
371
372	softc->flags |= PT_FLAG_DEVICE_INVALID;
373
374	/*
375	 * Although the oninvalidate() routines are always called at
376	 * splsoftcam, we need to be at splbio() here to keep the buffer
377	 * queue from being modified while we traverse it.
378	 */
379	s = splbio();
380
381	/*
382	 * Return all queued I/O with ENXIO.
383	 * XXX Handle any transactions queued to the card
384	 *     with XPT_ABORT_CCB.
385	 */
386	while ((q_bp = bioq_first(&softc->bio_queue)) != NULL){
387		bioq_remove(&softc->bio_queue, q_bp);
388		q_bp->bio_resid = q_bp->bio_bcount;
389		biofinish(q_bp, NULL, ENXIO);
390	}
391
392	splx(s);
393
394	xpt_print_path(periph->path);
395	printf("lost device\n");
396}
397
398static void
399ptdtor(struct cam_periph *periph)
400{
401	struct pt_softc *softc;
402
403	softc = (struct pt_softc *)periph->softc;
404
405	devstat_remove_entry(&softc->device_stats);
406
407	destroy_dev(softc->dev);
408
409	xpt_print_path(periph->path);
410	printf("removing device entry\n");
411	free(softc, M_DEVBUF);
412}
413
414static void
415ptasync(void *callback_arg, u_int32_t code, struct cam_path *path, void *arg)
416{
417	struct cam_periph *periph;
418
419	periph = (struct cam_periph *)callback_arg;
420	switch (code) {
421	case AC_FOUND_DEVICE:
422	{
423		struct ccb_getdev *cgd;
424		cam_status status;
425
426		cgd = (struct ccb_getdev *)arg;
427		if (cgd == NULL)
428			break;
429
430		if (SID_TYPE(&cgd->inq_data) != T_PROCESSOR)
431			break;
432
433		/*
434		 * Allocate a peripheral instance for
435		 * this device and start the probe
436		 * process.
437		 */
438		status = cam_periph_alloc(ptctor, ptoninvalidate, ptdtor,
439					  ptstart, "pt", CAM_PERIPH_BIO,
440					  cgd->ccb_h.path, ptasync,
441					  AC_FOUND_DEVICE, cgd);
442
443		if (status != CAM_REQ_CMP
444		 && status != CAM_REQ_INPROG)
445			printf("ptasync: Unable to attach to new device "
446				"due to status 0x%x\n", status);
447		break;
448	}
449	case AC_SENT_BDR:
450	case AC_BUS_RESET:
451	{
452		struct pt_softc *softc;
453		struct ccb_hdr *ccbh;
454		int s;
455
456		softc = (struct pt_softc *)periph->softc;
457		s = splsoftcam();
458		/*
459		 * Don't fail on the expected unit attention
460		 * that will occur.
461		 */
462		softc->flags |= PT_FLAG_RETRY_UA;
463		LIST_FOREACH(ccbh, &softc->pending_ccbs, periph_links.le)
464			ccbh->ccb_state |= PT_CCB_RETRY_UA;
465		splx(s);
466		/* FALLTHROUGH */
467	}
468	default:
469		cam_periph_async(periph, code, path, arg);
470		break;
471	}
472}
473
474static void
475ptstart(struct cam_periph *periph, union ccb *start_ccb)
476{
477	struct pt_softc *softc;
478	struct bio *bp;
479	int s;
480
481	softc = (struct pt_softc *)periph->softc;
482
483	/*
484	 * See if there is a buf with work for us to do..
485	 */
486	s = splbio();
487	bp = bioq_first(&softc->bio_queue);
488	if (periph->immediate_priority <= periph->pinfo.priority) {
489		CAM_DEBUG_PRINT(CAM_DEBUG_SUBTRACE,
490				("queuing for immediate ccb\n"));
491		start_ccb->ccb_h.ccb_state = PT_CCB_WAITING;
492		SLIST_INSERT_HEAD(&periph->ccb_list, &start_ccb->ccb_h,
493				  periph_links.sle);
494		periph->immediate_priority = CAM_PRIORITY_NONE;
495		splx(s);
496		wakeup(&periph->ccb_list);
497	} else if (bp == NULL) {
498		splx(s);
499		xpt_release_ccb(start_ccb);
500	} else {
501		int oldspl;
502
503		bioq_remove(&softc->bio_queue, bp);
504
505		devstat_start_transaction(&softc->device_stats);
506
507		scsi_send_receive(&start_ccb->csio,
508				  /*retries*/4,
509				  ptdone,
510				  MSG_SIMPLE_Q_TAG,
511				  bp->bio_cmd == BIO_READ,
512				  /*byte2*/0,
513				  bp->bio_bcount,
514				  bp->bio_data,
515				  /*sense_len*/SSD_FULL_SIZE,
516				  /*timeout*/softc->io_timeout);
517
518		start_ccb->ccb_h.ccb_state = PT_CCB_BUFFER_IO_UA;
519
520		/*
521		 * Block out any asyncronous callbacks
522		 * while we touch the pending ccb list.
523		 */
524		oldspl = splcam();
525		LIST_INSERT_HEAD(&softc->pending_ccbs, &start_ccb->ccb_h,
526				 periph_links.le);
527		splx(oldspl);
528
529		start_ccb->ccb_h.ccb_bp = bp;
530		bp = bioq_first(&softc->bio_queue);
531		splx(s);
532
533		xpt_action(start_ccb);
534
535		if (bp != NULL) {
536			/* Have more work to do, so ensure we stay scheduled */
537			xpt_schedule(periph, /* XXX priority */1);
538		}
539	}
540}
541
542static void
543ptdone(struct cam_periph *periph, union ccb *done_ccb)
544{
545	struct pt_softc *softc;
546	struct ccb_scsiio *csio;
547
548	softc = (struct pt_softc *)periph->softc;
549	csio = &done_ccb->csio;
550	switch (csio->ccb_h.ccb_state) {
551	case PT_CCB_BUFFER_IO:
552	case PT_CCB_BUFFER_IO_UA:
553	{
554		struct bio *bp;
555		int    oldspl;
556
557		bp = (struct bio *)done_ccb->ccb_h.ccb_bp;
558		if ((done_ccb->ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_CMP) {
559			int error;
560			int s;
561			int sf;
562
563			if ((csio->ccb_h.ccb_state & PT_CCB_RETRY_UA) != 0)
564				sf = SF_RETRY_UA;
565			else
566				sf = 0;
567
568			error = pterror(done_ccb, CAM_RETRY_SELTO, sf);
569			if (error == ERESTART) {
570				/*
571				 * A retry was scheuled, so
572				 * just return.
573				 */
574				return;
575			}
576			if (error != 0) {
577				struct bio *q_bp;
578
579				s = splbio();
580
581				if (error == ENXIO) {
582					/*
583					 * Catastrophic error.  Mark our device
584					 * as invalid.
585					 */
586					xpt_print_path(periph->path);
587					printf("Invalidating device\n");
588					softc->flags |= PT_FLAG_DEVICE_INVALID;
589				}
590
591				/*
592				 * return all queued I/O with EIO, so that
593				 * the client can retry these I/Os in the
594				 * proper order should it attempt to recover.
595				 */
596				while ((q_bp = bioq_first(&softc->bio_queue))
597					!= NULL) {
598					bioq_remove(&softc->bio_queue, q_bp);
599					q_bp->bio_resid = q_bp->bio_bcount;
600					biofinish(q_bp, NULL, EIO);
601				}
602				splx(s);
603				bp->bio_error = error;
604				bp->bio_resid = bp->bio_bcount;
605				bp->bio_flags |= BIO_ERROR;
606			} else {
607				bp->bio_resid = csio->resid;
608				bp->bio_error = 0;
609				if (bp->bio_resid != 0) {
610					/* Short transfer ??? */
611					bp->bio_flags |= BIO_ERROR;
612				}
613			}
614			if ((done_ccb->ccb_h.status & CAM_DEV_QFRZN) != 0)
615				cam_release_devq(done_ccb->ccb_h.path,
616						 /*relsim_flags*/0,
617						 /*reduction*/0,
618						 /*timeout*/0,
619						 /*getcount_only*/0);
620		} else {
621			bp->bio_resid = csio->resid;
622			if (bp->bio_resid != 0)
623				bp->bio_flags |= BIO_ERROR;
624		}
625
626		/*
627		 * Block out any asyncronous callbacks
628		 * while we touch the pending ccb list.
629		 */
630		oldspl = splcam();
631		LIST_REMOVE(&done_ccb->ccb_h, periph_links.le);
632		splx(oldspl);
633
634		biofinish(bp, &softc->device_stats, 0);
635		break;
636	}
637	case PT_CCB_WAITING:
638		/* Caller will release the CCB */
639		wakeup(&done_ccb->ccb_h.cbfcnp);
640		return;
641	}
642	xpt_release_ccb(done_ccb);
643}
644
645static int
646pterror(union ccb *ccb, u_int32_t cam_flags, u_int32_t sense_flags)
647{
648	struct pt_softc	  *softc;
649	struct cam_periph *periph;
650
651	periph = xpt_path_periph(ccb->ccb_h.path);
652	softc = (struct pt_softc *)periph->softc;
653
654	return(cam_periph_error(ccb, cam_flags, sense_flags,
655				&softc->saved_ccb));
656}
657
658static int
659ptioctl(dev_t dev, u_long cmd, caddr_t addr, int flag, struct thread *td)
660{
661	struct cam_periph *periph;
662	struct pt_softc *softc;
663	int error;
664
665	periph = (struct cam_periph *)dev->si_drv1;
666	if (periph == NULL)
667		return(ENXIO);
668
669	softc = (struct pt_softc *)periph->softc;
670
671	if ((error = cam_periph_lock(periph, PRIBIO|PCATCH)) != 0) {
672		return (error); /* error code from tsleep */
673	}
674
675	switch(cmd) {
676	case PTIOCGETTIMEOUT:
677		if (softc->io_timeout >= 1000)
678			*(int *)addr = softc->io_timeout / 1000;
679		else
680			*(int *)addr = 0;
681		break;
682	case PTIOCSETTIMEOUT:
683	{
684		int s;
685
686		if (*(int *)addr < 1) {
687			error = EINVAL;
688			break;
689		}
690
691		s = splsoftcam();
692		softc->io_timeout = *(int *)addr * 1000;
693		splx(s);
694
695		break;
696	}
697	default:
698		error = cam_periph_ioctl(periph, cmd, addr, pterror);
699		break;
700	}
701
702	cam_periph_unlock(periph);
703
704	return(error);
705}
706
707void
708scsi_send_receive(struct ccb_scsiio *csio, u_int32_t retries,
709		  void (*cbfcnp)(struct cam_periph *, union ccb *),
710		  u_int tag_action, int readop, u_int byte2,
711		  u_int32_t xfer_len, u_int8_t *data_ptr, u_int8_t sense_len,
712		  u_int32_t timeout)
713{
714	struct scsi_send_receive *scsi_cmd;
715
716	scsi_cmd = (struct scsi_send_receive *)&csio->cdb_io.cdb_bytes;
717	scsi_cmd->opcode = readop ? RECEIVE : SEND;
718	scsi_cmd->byte2 = byte2;
719	scsi_ulto3b(xfer_len, scsi_cmd->xfer_len);
720	scsi_cmd->control = 0;
721
722	cam_fill_csio(csio,
723		      retries,
724		      cbfcnp,
725		      /*flags*/readop ? CAM_DIR_IN : CAM_DIR_OUT,
726		      tag_action,
727		      data_ptr,
728		      xfer_len,
729		      sense_len,
730		      sizeof(*scsi_cmd),
731		      timeout);
732}
733