DEVFS - remove dev_ops_add(), dev_ops_get(), and get_dev()
[dragonfly.git] / sys / bus / cam / scsi / scsi_pt.c
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: src/sys/cam/scsi/scsi_pt.c,v 1.17 2000/01/17 06:27:37 mjacob Exp $
29  * $DragonFly: src/sys/bus/cam/scsi/scsi_pt.c,v 1.23 2008/05/18 20:30:20 pavalos Exp $
30  */
31
32 #include <sys/param.h>
33 #include <sys/queue.h>
34 #include <sys/systm.h>
35 #include <sys/kernel.h>
36 #include <sys/types.h>
37 #include <sys/buf.h>
38 #include <sys/devicestat.h>
39 #include <sys/malloc.h>
40 #include <sys/conf.h>
41 #include <sys/ptio.h>
42 #include <sys/buf2.h>
43 #include <sys/thread2.h>
44
45 #include "../cam.h"
46 #include "../cam_ccb.h"
47 #include "../cam_extend.h"
48 #include "../cam_periph.h"
49 #include "../cam_xpt_periph.h"
50 #include "../cam_debug.h"
51
52 #include "scsi_all.h"
53 #include "scsi_message.h"
54 #include "scsi_pt.h"
55
56 #include "opt_pt.h"
57
58 typedef enum {
59         PT_STATE_PROBE,
60         PT_STATE_NORMAL
61 } pt_state;
62
63 typedef enum {
64         PT_FLAG_NONE            = 0x00,
65         PT_FLAG_OPEN            = 0x01,
66         PT_FLAG_DEVICE_INVALID  = 0x02,
67         PT_FLAG_RETRY_UA        = 0x04
68 } pt_flags;
69
70 typedef enum {
71         PT_CCB_BUFFER_IO        = 0x01,
72         PT_CCB_WAITING          = 0x02,
73         PT_CCB_RETRY_UA         = 0x04,
74         PT_CCB_BUFFER_IO_UA     = PT_CCB_BUFFER_IO|PT_CCB_RETRY_UA
75 } pt_ccb_state;
76
77 /* Offsets into our private area for storing information */
78 #define ccb_state       ppriv_field0
79 #define ccb_bio         ppriv_ptr1
80
81 struct pt_softc {
82         struct   bio_queue_head bio_queue;
83         struct   devstat device_stats;
84         LIST_HEAD(, ccb_hdr) pending_ccbs;
85         pt_state state;
86         pt_flags flags; 
87         union    ccb saved_ccb;
88         int      io_timeout;
89         cdev_t   dev;
90 };
91
92 static  d_open_t        ptopen;
93 static  d_close_t       ptclose;
94 static  d_strategy_t    ptstrategy;
95 static  periph_init_t   ptinit;
96 static  void            ptasync(void *callback_arg, u_int32_t code,
97                                 struct cam_path *path, void *arg);
98 static  periph_ctor_t   ptctor;
99 static  periph_oninv_t  ptoninvalidate;
100 static  periph_dtor_t   ptdtor;
101 static  periph_start_t  ptstart;
102 static  void            ptdone(struct cam_periph *periph,
103                                union ccb *done_ccb);
104 static  d_ioctl_t       ptioctl;
105 static  int             pterror(union ccb *ccb, u_int32_t cam_flags,
106                                 u_int32_t sense_flags);
107
108 void    scsi_send_receive(struct ccb_scsiio *csio, u_int32_t retries,
109                           void (*cbfcnp)(struct cam_periph *, union ccb *),
110                           u_int tag_action, int readop, u_int byte2,
111                           u_int32_t xfer_len, u_int8_t *data_ptr,
112                           u_int8_t sense_len, u_int32_t timeout);
113
114 static struct periph_driver ptdriver =
115 {
116         ptinit, "pt",
117         TAILQ_HEAD_INITIALIZER(ptdriver.units), /* generation */ 0
118 };
119
120 PERIPHDRIVER_DECLARE(pt, ptdriver);
121
122 #define PT_CDEV_MAJOR 61
123
124 static struct dev_ops pt_ops = {
125         { "pt", PT_CDEV_MAJOR, 0 },
126         .d_open =       ptopen,
127         .d_close =      ptclose,
128         .d_read =       physread,
129         .d_write =      physwrite,
130         .d_ioctl =      ptioctl,
131         .d_strategy =   ptstrategy,
132 };
133
134 static struct extend_array *ptperiphs;
135
136 #ifndef SCSI_PT_DEFAULT_TIMEOUT
137 #define SCSI_PT_DEFAULT_TIMEOUT         60
138 #endif
139
140 static int
141 ptopen(struct dev_open_args *ap)
142 {
143         cdev_t dev = ap->a_head.a_dev;
144         struct cam_periph *periph;
145         struct pt_softc *softc;
146         int unit;
147         int error = 0;
148
149         unit = minor(dev);
150         periph = cam_extend_get(ptperiphs, unit);
151         if (cam_periph_acquire(periph) != CAM_REQ_CMP)
152                 return (ENXIO); 
153
154         softc = (struct pt_softc *)periph->softc;
155
156         cam_periph_lock(periph);
157         if (softc->flags & PT_FLAG_DEVICE_INVALID) {
158                 cam_periph_unlock(periph);
159                 cam_periph_release(periph);
160                 return(ENXIO);
161         }
162
163         if ((softc->flags & PT_FLAG_OPEN) == 0)
164                 softc->flags |= PT_FLAG_OPEN;
165         else {
166                 error = EBUSY;
167                 cam_periph_release(periph);
168         }
169
170         CAM_DEBUG(periph->path, CAM_DEBUG_TRACE,
171             ("ptopen: dev=%s\n", devtoname(dev)));
172
173         cam_periph_unlock(periph);
174         return (error);
175 }
176
177 static int
178 ptclose(struct dev_close_args *ap)
179 {
180         cdev_t dev = ap->a_head.a_dev;
181         struct  cam_periph *periph;
182         struct  pt_softc *softc;
183         int     unit;
184
185         unit = minor(dev);
186         periph = cam_extend_get(ptperiphs, unit);
187         if (periph == NULL)
188                 return (ENXIO); 
189
190         softc = (struct pt_softc *)periph->softc;
191
192         cam_periph_lock(periph);
193
194         softc->flags &= ~PT_FLAG_OPEN;
195         cam_periph_unlock(periph);
196         cam_periph_release(periph);
197         return (0);
198 }
199
200 /*
201  * Actually translate the requested transfer into one the physical driver
202  * can understand.  The transfer is described by a buf and will include
203  * only one physical transfer.
204  */
205 static int
206 ptstrategy(struct dev_strategy_args *ap)
207 {
208         cdev_t dev = ap->a_head.a_dev;
209         struct bio *bio = ap->a_bio;
210         struct buf *bp = bio->bio_buf;
211         struct cam_periph *periph;
212         struct pt_softc *softc;
213         u_int  unit;
214         
215         unit = minor(dev);
216         periph = cam_extend_get(ptperiphs, unit);
217         if (periph == NULL) {
218                 bp->b_error = ENXIO;
219                 goto bad;               
220         }
221         cam_periph_lock(periph);
222         softc = (struct pt_softc *)periph->softc;
223
224         /*
225          * If the device has been made invalid, error out
226          */
227         if ((softc->flags & PT_FLAG_DEVICE_INVALID)) {
228                 cam_periph_unlock(periph);
229                 bp->b_error = ENXIO;
230                 goto bad;
231         }
232         
233         /*
234          * Place it in the queue of disk activities for this disk
235          */
236         bioq_insert_tail(&softc->bio_queue, bio);
237         
238         /*
239          * Schedule ourselves for performing the work.
240          */
241         xpt_schedule(periph, /* XXX priority */1);
242         cam_periph_unlock(periph);
243
244         return(0);
245 bad:
246         bp->b_flags |= B_ERROR;
247
248         /*
249          * Correctly set the buf to indicate a completed xfer
250          */
251         bp->b_resid = bp->b_bcount;
252         biodone(bio);
253         return(0);
254 }
255
256 static void
257 ptinit(void)
258 {
259         cam_status status;
260
261         /*
262          * Create our extend array for storing the devices we attach to.
263          */
264         ptperiphs = cam_extend_new();
265         if (ptperiphs == NULL) {
266                 kprintf("pt: Failed to alloc extend array!\n");
267                 return;
268         }
269         
270         /*
271          * Install a global async callback.  This callback will
272          * receive async callbacks like "new device found".
273          */
274         status = xpt_register_async(AC_FOUND_DEVICE, ptasync, NULL, NULL);
275
276         if (status != CAM_REQ_CMP) {
277                 kprintf("pt: Failed to attach master async callback "
278                        "due to status 0x%x!\n", status);
279         }
280 }
281
282 static cam_status
283 ptctor(struct cam_periph *periph, void *arg)
284 {
285         struct pt_softc *softc;
286         struct ccb_getdev *cgd;
287
288         cgd = (struct ccb_getdev *)arg;
289         if (periph == NULL) {
290                 kprintf("ptregister: periph was NULL!!\n");
291                 return(CAM_REQ_CMP_ERR);
292         }
293
294         if (cgd == NULL) {
295                 kprintf("ptregister: no getdev CCB, can't register device\n");
296                 return(CAM_REQ_CMP_ERR);
297         }
298
299         softc = kmalloc(sizeof(*softc), M_DEVBUF, M_INTWAIT | M_ZERO);
300         LIST_INIT(&softc->pending_ccbs);
301         softc->state = PT_STATE_NORMAL;
302         bioq_init(&softc->bio_queue);
303
304         softc->io_timeout = SCSI_PT_DEFAULT_TIMEOUT * 1000;
305
306         periph->softc = softc;
307         
308         cam_periph_unlock(periph);
309         cam_extend_set(ptperiphs, periph->unit_number, periph);
310
311         devstat_add_entry(&softc->device_stats, "pt",
312                           periph->unit_number, 0,
313                           DEVSTAT_NO_BLOCKSIZE,
314                           SID_TYPE(&cgd->inq_data) | DEVSTAT_TYPE_IF_SCSI,
315                           DEVSTAT_PRIORITY_OTHER);
316
317         make_dev(&pt_ops, periph->unit_number, UID_ROOT,
318                   GID_OPERATOR, 0600, "%s%d", periph->periph_name,
319                   periph->unit_number);
320         cam_periph_lock(periph);
321         /*
322          * Add async callbacks for bus reset and
323          * bus device reset calls.  I don't bother
324          * checking if this fails as, in most cases,
325          * the system will function just fine without
326          * them and the only alternative would be to
327          * not attach the device on failure.
328          */
329         xpt_register_async(AC_SENT_BDR | AC_BUS_RESET | AC_LOST_DEVICE,
330                            ptasync, periph, periph->path);
331
332         /* Tell the user we've attached to the device */
333         xpt_announce_periph(periph, NULL);
334
335         return(CAM_REQ_CMP);
336 }
337
338 static void
339 ptoninvalidate(struct cam_periph *periph)
340 {
341         struct pt_softc *softc;
342         struct bio *q_bio;
343         struct buf *q_bp;
344
345         softc = (struct pt_softc *)periph->softc;
346
347         /*
348          * De-register any async callbacks.
349          */
350         xpt_register_async(0, ptasync, periph, periph->path);
351
352         softc->flags |= PT_FLAG_DEVICE_INVALID;
353
354         /*
355          * Return all queued I/O with ENXIO.
356          * XXX Handle any transactions queued to the card
357          *     with XPT_ABORT_CCB.
358          */
359         while ((q_bio = bioq_first(&softc->bio_queue)) != NULL){
360                 bioq_remove(&softc->bio_queue, q_bio);
361                 q_bp = q_bio->bio_buf;
362                 q_bp->b_resid = q_bp->b_bcount;
363                 q_bp->b_error = ENXIO;
364                 q_bp->b_flags |= B_ERROR;
365                 biodone(q_bio);
366         }
367
368         xpt_print(periph->path, "lost device\n");
369 }
370
371 static void
372 ptdtor(struct cam_periph *periph)
373 {
374         struct pt_softc *softc;
375
376         softc = (struct pt_softc *)periph->softc;
377
378         devstat_remove_entry(&softc->device_stats);
379
380         cam_extend_release(ptperiphs, periph->unit_number);
381         xpt_print(periph->path, "removing device entry\n");
382         dev_ops_remove_minor(&pt_ops, periph->unit_number);
383         kfree(softc, M_DEVBUF);
384 }
385
386 static void
387 ptasync(void *callback_arg, u_int32_t code, struct cam_path *path, void *arg)
388 {
389         struct cam_periph *periph;
390
391         periph = (struct cam_periph *)callback_arg;
392         switch (code) {
393         case AC_FOUND_DEVICE:
394         {
395                 struct ccb_getdev *cgd;
396                 cam_status status;
397  
398                 cgd = (struct ccb_getdev *)arg;
399                 if (cgd == NULL)
400                         break;
401
402                 if (SID_TYPE(&cgd->inq_data) != T_PROCESSOR)
403                         break;
404
405                 /*
406                  * Allocate a peripheral instance for
407                  * this device and start the probe
408                  * process.
409                  */
410                 status = cam_periph_alloc(ptctor, ptoninvalidate, ptdtor,
411                                           ptstart, "pt", CAM_PERIPH_BIO,
412                                           cgd->ccb_h.path, ptasync,
413                                           AC_FOUND_DEVICE, cgd);
414
415                 if (status != CAM_REQ_CMP
416                  && status != CAM_REQ_INPROG)
417                         kprintf("ptasync: Unable to attach to new device "
418                                 "due to status 0x%x\n", status);
419                 break;
420         }
421         case AC_SENT_BDR:
422         case AC_BUS_RESET:
423         {
424                 struct pt_softc *softc;
425                 struct ccb_hdr *ccbh;
426
427                 softc = (struct pt_softc *)periph->softc;
428                 /*
429                  * Don't fail on the expected unit attention
430                  * that will occur.
431                  */
432                 softc->flags |= PT_FLAG_RETRY_UA;
433                 LIST_FOREACH(ccbh, &softc->pending_ccbs, periph_links.le)
434                         ccbh->ccb_state |= PT_CCB_RETRY_UA;
435                 /* FALLTHROUGH */
436         }
437         default:
438                 cam_periph_async(periph, code, path, arg);
439                 break;
440         }
441 }
442
443 static void
444 ptstart(struct cam_periph *periph, union ccb *start_ccb)
445 {
446         struct pt_softc *softc;
447         struct buf *bp;
448         struct bio *bio;
449
450         softc = (struct pt_softc *)periph->softc;
451
452         /*
453          * See if there is a buf with work for us to do..
454          */
455         bio = bioq_first(&softc->bio_queue);
456         if (periph->immediate_priority <= periph->pinfo.priority) {
457                 CAM_DEBUG_PRINT(CAM_DEBUG_SUBTRACE,
458                                 ("queuing for immediate ccb\n"));
459                 start_ccb->ccb_h.ccb_state = PT_CCB_WAITING;
460                 SLIST_INSERT_HEAD(&periph->ccb_list, &start_ccb->ccb_h,
461                                   periph_links.sle);
462                 periph->immediate_priority = CAM_PRIORITY_NONE;
463                 wakeup(&periph->ccb_list);
464         } else if (bio == NULL) {
465                 xpt_release_ccb(start_ccb);
466         } else {
467                 bioq_remove(&softc->bio_queue, bio);
468                 bp = bio->bio_buf;
469
470                 devstat_start_transaction(&softc->device_stats);
471
472                 scsi_send_receive(&start_ccb->csio,
473                                   /*retries*/4,
474                                   ptdone,
475                                   MSG_SIMPLE_Q_TAG,
476                                   (bp->b_cmd == BUF_CMD_READ),
477                                   /*byte2*/0,
478                                   bp->b_bcount,
479                                   bp->b_data,
480                                   /*sense_len*/SSD_FULL_SIZE,
481                                   /*timeout*/softc->io_timeout);
482
483                 start_ccb->ccb_h.ccb_state = PT_CCB_BUFFER_IO_UA;
484
485                 /*
486                  * Block out any asyncronous callbacks
487                  * while we touch the pending ccb list.
488                  */
489                 LIST_INSERT_HEAD(&softc->pending_ccbs, &start_ccb->ccb_h,
490                                  periph_links.le);
491
492                 start_ccb->ccb_h.ccb_bio = bio;
493                 bio = bioq_first(&softc->bio_queue);
494
495                 xpt_action(start_ccb);
496                 
497                 if (bio != NULL) {
498                         /* Have more work to do, so ensure we stay scheduled */
499                         xpt_schedule(periph, /* XXX priority */1);
500                 }
501         }
502 }
503
504 static void
505 ptdone(struct cam_periph *periph, union ccb *done_ccb)
506 {
507         struct pt_softc *softc;
508         struct ccb_scsiio *csio;
509
510         softc = (struct pt_softc *)periph->softc;
511         csio = &done_ccb->csio;
512         switch (csio->ccb_h.ccb_state) {
513         case PT_CCB_BUFFER_IO:
514         case PT_CCB_BUFFER_IO_UA:
515         {
516                 struct buf *bp;
517                 struct bio *bio;
518
519                 bio = (struct bio *)done_ccb->ccb_h.ccb_bio;
520                 bp = bio->bio_buf;
521
522                 if ((done_ccb->ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_CMP) {
523                         int error;
524                         int sf;
525                         
526                         if ((csio->ccb_h.ccb_state & PT_CCB_RETRY_UA) != 0)
527                                 sf = SF_RETRY_UA;
528                         else
529                                 sf = 0;
530
531                         error = pterror(done_ccb, CAM_RETRY_SELTO, sf);
532                         if (error == ERESTART) {
533                                 /*
534                                  * A retry was scheuled, so
535                                  * just return.
536                                  */
537                                 return;
538                         }
539                         if (error != 0) {
540                                 struct buf *q_bp;
541                                 struct bio *q_bio;
542
543                                 if (error == ENXIO) {
544                                         /*
545                                          * Catastrophic error.  Mark our device
546                                          * as invalid.
547                                          */
548                                         xpt_print(periph->path,
549                                             "Invalidating device\n");
550                                         softc->flags |= PT_FLAG_DEVICE_INVALID;
551                                 }
552
553                                 /*
554                                  * return all queued I/O with EIO, so that
555                                  * the client can retry these I/Os in the
556                                  * proper order should it attempt to recover.
557                                  */
558                                 while ((q_bio = bioq_first(&softc->bio_queue))
559                                         != NULL) {
560                                         bioq_remove(&softc->bio_queue, q_bio);
561                                         q_bp = q_bio->bio_buf;
562                                         q_bp->b_resid = q_bp->b_bcount;
563                                         q_bp->b_error = EIO;
564                                         q_bp->b_flags |= B_ERROR;
565                                         biodone(q_bio);
566                                 }
567                                 bp->b_error = error;
568                                 bp->b_resid = bp->b_bcount;
569                                 bp->b_flags |= B_ERROR;
570                         } else {
571                                 bp->b_resid = csio->resid;
572                                 bp->b_error = 0;
573                                 if (bp->b_resid != 0) {
574                                         /* Short transfer ??? */
575                                         bp->b_flags |= B_ERROR;
576                                 }
577                         }
578                         if ((done_ccb->ccb_h.status & CAM_DEV_QFRZN) != 0)
579                                 cam_release_devq(done_ccb->ccb_h.path,
580                                                  /*relsim_flags*/0,
581                                                  /*reduction*/0,
582                                                  /*timeout*/0,
583                                                  /*getcount_only*/0);
584                 } else {
585                         bp->b_resid = csio->resid;
586                         if (bp->b_resid != 0)
587                                 bp->b_flags |= B_ERROR;
588                 }
589
590                 /*
591                  * Block out any asyncronous callbacks
592                  * while we touch the pending ccb list.
593                  */
594                 LIST_REMOVE(&done_ccb->ccb_h, periph_links.le);
595
596                 devstat_end_transaction_buf(&softc->device_stats, bp);
597                 biodone(bio);
598                 break;
599         }
600         case PT_CCB_WAITING:
601                 /* Caller will release the CCB */
602                 wakeup(&done_ccb->ccb_h.cbfcnp);
603                 return;
604         }
605         xpt_release_ccb(done_ccb);
606 }
607
608 static int
609 pterror(union ccb *ccb, u_int32_t cam_flags, u_int32_t sense_flags)
610 {
611         struct pt_softc   *softc;
612         struct cam_periph *periph;
613
614         periph = xpt_path_periph(ccb->ccb_h.path);
615         softc = (struct pt_softc *)periph->softc;
616
617         return(cam_periph_error(ccb, cam_flags, sense_flags,
618                                 &softc->saved_ccb));
619 }
620
621 static int
622 ptioctl(struct dev_ioctl_args *ap)
623 {
624         cdev_t dev = ap->a_head.a_dev;
625         caddr_t addr = ap->a_data;
626         struct cam_periph *periph;
627         struct pt_softc *softc;
628         int unit;
629         int error = 0;
630
631         unit = minor(dev);
632         periph = cam_extend_get(ptperiphs, unit);
633
634         if (periph == NULL)
635                 return(ENXIO);
636
637         softc = (struct pt_softc *)periph->softc;
638
639         cam_periph_lock(periph);
640
641         switch(ap->a_cmd) {
642         case PTIOCGETTIMEOUT:
643                 if (softc->io_timeout >= 1000)
644                         *(int *)addr = softc->io_timeout / 1000;
645                 else
646                         *(int *)addr = 0;
647                 break;
648         case PTIOCSETTIMEOUT:
649                 if (*(int *)addr < 1) {
650                         error = EINVAL;
651                         break;
652                 }
653
654                 softc->io_timeout = *(int *)addr * 1000;
655
656                 break;
657         default:
658                 error = cam_periph_ioctl(periph, ap->a_cmd, addr, pterror);
659                 break;
660         }
661
662         cam_periph_unlock(periph);
663
664         return(error);
665 }
666
667 void
668 scsi_send_receive(struct ccb_scsiio *csio, u_int32_t retries,
669                   void (*cbfcnp)(struct cam_periph *, union ccb *),
670                   u_int tag_action, int readop, u_int byte2,
671                   u_int32_t xfer_len, u_int8_t *data_ptr, u_int8_t sense_len,
672                   u_int32_t timeout)
673 {
674         struct scsi_send_receive *scsi_cmd;
675
676         scsi_cmd = (struct scsi_send_receive *)&csio->cdb_io.cdb_bytes;
677         scsi_cmd->opcode = readop ? RECEIVE : SEND;
678         scsi_cmd->byte2 = byte2;
679         scsi_ulto3b(xfer_len, scsi_cmd->xfer_len);
680         scsi_cmd->control = 0;
681
682         cam_fill_csio(csio,
683                       retries,
684                       cbfcnp,
685                       /*flags*/readop ? CAM_DIR_IN : CAM_DIR_OUT,
686                       tag_action,
687                       data_ptr,
688                       xfer_len,
689                       sense_len,
690                       sizeof(*scsi_cmd),
691                       timeout);
692 }