xref: /dragonfly/sys/dev/raid/amr/amr_cam.c (revision 984263bc)
1 /*-
2  * Copyright (c) 2000 Michael Smith
3  * Copyright (c) 2000 BSDi
4  * All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  * 1. Redistributions of source code must retain the above copyright
10  *    notice, this list of conditions and the following disclaimer.
11  * 2. Redistributions in binary form must reproduce the above copyright
12  *    notice, this list of conditions and the following disclaimer in the
13  *    documentation and/or other materials provided with the distribution.
14  *
15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25  * SUCH DAMAGE.
26  *
27  * Copyright (c) 2002 Eric Moore
28  * Copyright (c) 2002 LSI Logic Corporation
29  * All rights reserved.
30  *
31  * Redistribution and use in source and binary forms, with or without
32  * modification, are permitted provided that the following conditions
33  * are met:
34  * 1. Redistributions of source code must retain the above copyright
35  *    notice, this list of conditions and the following disclaimer.
36  * 2. Redistributions in binary form must reproduce the above copyright
37  *    notice, this list of conditions and the following disclaimer in the
38  *    documentation and/or other materials provided with the distribution.
39  * 3. The party using or redistributing the source code and binary forms
40  *    agrees to the disclaimer below and the terms and conditions set forth
41  *    herein.
42  *
43  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
44  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
45  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
46  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
47  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
48  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
49  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
50  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
51  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
52  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
53  * SUCH DAMAGE.
54  *
55  *	$FreeBSD: src/sys/dev/amr/amr_cam.c,v 1.1.2.3 2002/11/11 13:19:10 emoore Exp $
56  */
57 
58 #include <sys/param.h>
59 #include <sys/systm.h>
60 #include <sys/malloc.h>
61 #include <sys/kernel.h>
62 
63 #include <dev/amr/amr_compat.h>
64 #include <sys/bus.h>
65 #include <sys/conf.h>
66 #include <sys/devicestat.h>
67 #include <sys/disk.h>
68 #include <sys/stat.h>
69 
70 #include <cam/cam.h>
71 #include <cam/cam_ccb.h>
72 #include <cam/cam_sim.h>
73 #include <cam/cam_xpt.h>
74 #include <cam/cam_xpt_sim.h>
75 #include <cam/cam_debug.h>
76 #include <cam/scsi/scsi_all.h>
77 #include <cam/scsi/scsi_message.h>
78 
79 #include <machine/resource.h>
80 #include <machine/bus.h>
81 
82 #include <dev/amr/amrreg.h>
83 #include <dev/amr/amrvar.h>
84 
85 static void		amr_cam_action(struct cam_sim *sim, union ccb *ccb);
86 static void		amr_cam_poll(struct cam_sim *sim);
87 static void		amr_cam_complete(struct amr_command *ac);
88 static void		amr_cam_complete_extcdb(struct amr_command *ac);
89 
90 
91 /********************************************************************************
92  * Enqueue/dequeue functions
93  */
94 static __inline void
95 amr_enqueue_ccb(struct amr_softc *sc, union ccb *ccb)
96 {
97     int		s;
98 
99     s = splbio();
100     TAILQ_INSERT_TAIL(&sc->amr_cam_ccbq, &ccb->ccb_h, sim_links.tqe);
101     splx(s);
102 }
103 
104 static __inline void
105 amr_requeue_ccb(struct amr_softc *sc, union ccb *ccb)
106 {
107     int		s;
108 
109     s = splbio();
110     TAILQ_INSERT_HEAD(&sc->amr_cam_ccbq, &ccb->ccb_h, sim_links.tqe);
111     splx(s);
112 }
113 
114 static __inline union ccb *
115 amr_dequeue_ccb(struct amr_softc *sc)
116 {
117     union ccb	*ccb;
118     int		s;
119 
120     s = splbio();
121     if ((ccb = (union ccb *)TAILQ_FIRST(&sc->amr_cam_ccbq)) != NULL)
122 	TAILQ_REMOVE(&sc->amr_cam_ccbq, &ccb->ccb_h, sim_links.tqe);
123     splx(s);
124     return(ccb);
125 }
126 
127 /********************************************************************************
128  * Attach our 'real' SCSI channels to CAM
129  */
130 int
131 amr_cam_attach(struct amr_softc *sc)
132 {
133     struct cam_devq	*devq;
134     int			chn;
135 
136     /* initialise the ccb queue */
137     TAILQ_INIT(&sc->amr_cam_ccbq);
138 
139     /*
140      * Allocate a devq for all our channels combined.  This should
141      * allow for the maximum number of SCSI commands we will accept
142      * at one time.
143      */
144     if ((devq = cam_simq_alloc(AMR_MAX_SCSI_CMDS)) == NULL)
145 	return(ENOMEM);
146 
147     /*
148      * Iterate over our channels, registering them with CAM
149      */
150     for (chn = 0; chn < sc->amr_maxchan; chn++) {
151 
152 	/* allocate a sim */
153 	if ((sc->amr_cam_sim[chn] = cam_sim_alloc(amr_cam_action,
154 						  amr_cam_poll,
155 						  "amr",
156 						  sc,
157 						  device_get_unit(sc->amr_dev),
158 						  1,
159 						  AMR_MAX_SCSI_CMDS,
160 						  devq)) == NULL) {
161 	    cam_simq_free(devq);
162 	    device_printf(sc->amr_dev, "CAM SIM attach failed\n");
163 	    return(ENOMEM);
164 	}
165 
166 	/* register the bus ID so we can get it later */
167 	if (xpt_bus_register(sc->amr_cam_sim[chn], chn)) {
168 	    device_printf(sc->amr_dev, "CAM XPT bus registration failed\n");
169 	    return(ENXIO);
170 	}
171     }
172     /*
173      * XXX we should scan the config and work out which devices are actually
174      * protected.
175      */
176     return(0);
177 }
178 
179 /********************************************************************************
180  * Disconnect ourselves from CAM
181  */
182 void
183 amr_cam_detach(struct amr_softc *sc)
184 {
185     int		chn, first;
186 
187     for (chn = 0, first = 1; chn < sc->amr_maxchan; chn++) {
188 
189 	/*
190 	 * If a sim was allocated for this channel, free it
191 	 */
192 	if (sc->amr_cam_sim[chn] != NULL) {
193 	    xpt_bus_deregister(cam_sim_path(sc->amr_cam_sim[chn]));
194 	    cam_sim_free(sc->amr_cam_sim[chn], first ? TRUE : FALSE);
195 	    first = 0;
196 	}
197     }
198 }
199 
200 /********************************************************************************
201  ********************************************************************************
202                                                         CAM passthrough interface
203  ********************************************************************************
204  ********************************************************************************/
205 
206 /********************************************************************************
207  * Handle a request for action from CAM
208  */
209 static void
210 amr_cam_action(struct cam_sim *sim, union ccb *ccb)
211 {
212     struct amr_softc	*sc = cam_sim_softc(sim);
213 
214     switch(ccb->ccb_h.func_code) {
215 
216     /*
217      * Perform SCSI I/O to a physical device.
218      */
219     case XPT_SCSI_IO:
220     {
221 	struct ccb_hdr		*ccbh = &ccb->ccb_h;
222 	struct ccb_scsiio	*csio = &ccb->csio;
223 
224 	/* Validate the CCB */
225 	ccbh->status = CAM_REQ_INPROG;
226 
227 	/* check the CDB length */
228 	if (csio->cdb_len > AMR_MAX_EXTCDB_LEN)
229 	    ccbh->status = CAM_REQ_CMP_ERR;
230 
231 	if ((csio->cdb_len > AMR_MAX_CDB_LEN) && (sc->support_ext_cdb == 0 ))
232 	    ccbh->status = CAM_REQ_CMP_ERR;
233 
234 	/* check that the CDB pointer is not to a physical address */
235 	if ((ccbh->flags & CAM_CDB_POINTER) && (ccbh->flags & CAM_CDB_PHYS))
236 	    ccbh->status = CAM_REQ_CMP_ERR;
237 
238 	/* if there is data transfer, it must be to/from a virtual address */
239 	if ((ccbh->flags & CAM_DIR_MASK) != CAM_DIR_NONE) {
240 	    if (ccbh->flags & CAM_DATA_PHYS)		/* we can't map it */
241 		ccbh->status = CAM_REQ_CMP_ERR;
242 	    if (ccbh->flags & CAM_SCATTER_VALID)	/* we want to do the s/g setup */
243 		ccbh->status = CAM_REQ_CMP_ERR;
244 	}
245 
246 	/*
247 	 * If the command is to a LUN other than 0, fail it.
248 	 * This is probably incorrect, but during testing the firmware did not
249 	 * seem to respect the LUN field, and thus devices appear echoed.
250 	 */
251 	if (csio->ccb_h.target_lun != 0)
252 	    ccbh->status = CAM_REQ_CMP_ERR;
253 
254 	/* if we're happy with the request, queue it for attention */
255 	if (ccbh->status == CAM_REQ_INPROG) {
256 
257 	    /* save the channel number in the ccb */
258 	    csio->ccb_h.sim_priv.entries[0].field = cam_sim_bus(sim);
259 
260 	    amr_enqueue_ccb(sc, ccb);
261 	    amr_startio(sc);
262 	    return;
263 	}
264 	break;
265     }
266 
267     case XPT_CALC_GEOMETRY:
268     {
269 	struct    ccb_calc_geometry *ccg = &ccb->ccg;
270 	u_int32_t size_in_mb;
271 	u_int32_t secs_per_cylinder;
272 
273 	size_in_mb = ccg->volume_size / ((1024L * 1024L) / ccg->block_size);
274 
275 	if (size_in_mb > 1024) {
276 	    ccg->heads = 255;
277 	    ccg->secs_per_track = 63;
278 	} else {
279 	    ccg->heads = 64;
280 	    ccg->secs_per_track = 32;
281 	}
282 	secs_per_cylinder = ccg->heads * ccg->secs_per_track;
283 	ccg->cylinders = ccg->volume_size / secs_per_cylinder;
284 	ccb->ccb_h.status = CAM_REQ_CMP;
285 	break;
286     }
287 
288     /*
289      * Return path stats.  Some of these should probably be
290      * amended.
291      */
292     case XPT_PATH_INQ:
293     {
294 	struct ccb_pathinq      *cpi = & ccb->cpi;
295 
296 	debug(3, "XPT_PATH_INQ");
297 	cpi->version_num = 1;           /* XXX??? */
298 	cpi->hba_inquiry = PI_SDTR_ABLE|PI_TAG_ABLE|PI_WIDE_16;
299 	cpi->target_sprt = 0;
300 	cpi->hba_misc = PIM_NOBUSRESET;
301 	cpi->hba_eng_cnt = 0;
302 	cpi->max_target = AMR_MAX_TARGETS;
303 	cpi->max_lun = 0 /* AMR_MAX_LUNS*/;
304 	cpi->initiator_id = 7;          /* XXX variable? */
305 	strncpy(cpi->sim_vid, "FreeBSD", SIM_IDLEN);
306 	strncpy(cpi->hba_vid, "LSI", HBA_IDLEN);
307 	strncpy(cpi->dev_name, cam_sim_name(sim), DEV_IDLEN);
308 	cpi->unit_number = cam_sim_unit(sim);
309 	cpi->bus_id = cam_sim_bus(sim);
310 	cpi->base_transfer_speed = 132 * 1024;  /* XXX get from controller? */
311 	cpi->ccb_h.status = CAM_REQ_CMP;
312 
313 	break;
314     }
315 
316     case XPT_RESET_BUS:
317     {
318 	struct ccb_pathinq	*cpi = & ccb->cpi;
319 
320 	debug(1, "XPT_RESET_BUS");
321 	cpi->ccb_h.status = CAM_REQ_CMP;
322 	break;
323     }
324 
325     case XPT_RESET_DEV:
326     {
327 	debug(1, "XPT_RESET_DEV");
328 	ccb->ccb_h.status = CAM_REQ_CMP;
329 	break;
330     }
331 
332     case XPT_GET_TRAN_SETTINGS:
333     {
334 	struct ccb_trans_settings	*cts;
335 
336 	debug(3, "XPT_GET_TRAN_SETTINGS");
337 
338 	cts = &(ccb->cts);
339 
340 	if ((cts->flags & CCB_TRANS_USER_SETTINGS) == 0) {
341 		ccb->ccb_h.status = CAM_FUNC_NOTAVAIL;
342 		break;
343         }
344 
345 	cts->flags = CCB_TRANS_DISC_ENB|CCB_TRANS_TAG_ENB;
346 	cts->bus_width = MSG_EXT_WDTR_BUS_32_BIT;
347 	cts->sync_period = 6;   /* 40MHz how wide is this bus? */
348 	cts->sync_offset = 31;  /* How to extract this from board? */
349 
350 	cts->valid = CCB_TRANS_SYNC_RATE_VALID
351 	    | CCB_TRANS_SYNC_OFFSET_VALID
352 	    | CCB_TRANS_BUS_WIDTH_VALID
353 	    | CCB_TRANS_DISC_VALID
354 	    | CCB_TRANS_TQ_VALID;
355 	ccb->ccb_h.status = CAM_REQ_CMP;
356 	break;
357     }
358 
359     case XPT_SET_TRAN_SETTINGS:
360 	debug(3, "XPT_SET_TRAN_SETTINGS");
361 	ccb->ccb_h.status = CAM_FUNC_NOTAVAIL;
362 	break;
363 
364 
365     /*
366      * Reject anything else as unsupported.
367      */
368     default:
369 	/* we can't do this */
370 	ccb->ccb_h.status = CAM_REQ_INVALID;
371 	break;
372     }
373     xpt_done(ccb);
374 }
375 
376 /********************************************************************************
377  * Convert a CAM CCB off the top of the CCB queue to a passthrough SCSI command.
378  */
379 int
380 amr_cam_command(struct amr_softc *sc, struct amr_command **acp)
381 {
382     struct amr_command		*ac;
383     struct amr_passthrough		*ap;
384     struct amr_ext_passthrough	*aep;
385     struct ccb_scsiio			*csio;
386     int				bus, target, error;
387 
388     error = 0;
389     ac = NULL;
390     ap = NULL;
391     aep = NULL;
392 
393     /* check to see if there is a ccb for us to work with */
394     if ((csio = (struct ccb_scsiio *)amr_dequeue_ccb(sc)) == NULL)
395 	goto out;
396 
397     /* get bus/target, XXX validate against protected devices? */
398     bus = csio->ccb_h.sim_priv.entries[0].field;
399     target = csio->ccb_h.target_id;
400 
401     /*
402      * Build a passthrough command.
403      */
404 
405     /* construct passthrough */
406     if (sc->support_ext_cdb ) {
407 	    if ((aep = malloc(sizeof(*aep), M_DEVBUF, M_NOWAIT | M_ZERO)) == NULL) {
408 		error = ENOMEM;
409 		goto out;
410 	    }
411 	    aep->ap_timeout = 2;
412 	    aep->ap_ars = 1;
413 	    aep->ap_request_sense_length = 14;
414 	    aep->ap_islogical = 0;
415 	    aep->ap_channel = bus;
416 	    aep->ap_scsi_id = target;
417 	    aep->ap_logical_drive_no = csio->ccb_h.target_lun;
418 	    aep->ap_cdb_length = csio->cdb_len;
419 	    aep->ap_data_transfer_length = csio->dxfer_len;
420 	    if (csio->ccb_h.flags & CAM_CDB_POINTER) {
421 		bcopy(csio->cdb_io.cdb_ptr, aep->ap_cdb, csio->cdb_len);
422 	    } else {
423 		bcopy(csio->cdb_io.cdb_bytes, aep->ap_cdb, csio->cdb_len);
424 	    }
425 	    /* we leave the data s/g list and s/g count to the map routine later */
426 
427 	    debug(2, " COMMAND %x/%d+%d to %d:%d:%d", aep->ap_cdb[0], aep->ap_cdb_length, csio->dxfer_len,
428 		  aep->ap_channel, aep->ap_scsi_id, aep->ap_logical_drive_no);
429 
430     } else {
431 	    if ((ap = malloc(sizeof(*ap), M_DEVBUF, M_NOWAIT | M_ZERO)) == NULL) {
432 		error = ENOMEM;
433 		goto out;
434 	    }
435 	    ap->ap_timeout = 0;
436 	    ap->ap_ars = 1;
437 	    ap->ap_request_sense_length = 14;
438 	    ap->ap_islogical = 0;
439 	    ap->ap_channel = bus;
440 	    ap->ap_scsi_id = target;
441 	    ap->ap_logical_drive_no = csio->ccb_h.target_lun;
442 	    ap->ap_cdb_length = csio->cdb_len;
443 	    ap->ap_data_transfer_length = csio->dxfer_len;
444 	    if (csio->ccb_h.flags & CAM_CDB_POINTER) {
445 		bcopy(csio->cdb_io.cdb_ptr, ap->ap_cdb, csio->cdb_len);
446 	    } else {
447 		bcopy(csio->cdb_io.cdb_bytes, ap->ap_cdb, csio->cdb_len);
448 	    }
449 	    /* we leave the data s/g list and s/g count to the map routine later */
450 
451 	    debug(2, " COMMAND %x/%d+%d to %d:%d:%d", ap->ap_cdb[0], ap->ap_cdb_length, csio->dxfer_len,
452 		  ap->ap_channel, ap->ap_scsi_id, ap->ap_logical_drive_no);
453     }
454 
455     /* construct command */
456     if ((ac = amr_alloccmd(sc)) == NULL) {
457 	error = ENOMEM;
458 	goto out;
459     }
460 
461     ac->ac_flags |= AMR_CMD_DATAOUT;
462 
463     ac->ac_ccb_data = csio->data_ptr;
464     ac->ac_ccb_length = csio->dxfer_len;
465     if ((csio->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_IN)
466 	ac->ac_flags |= AMR_CMD_CCB_DATAIN;
467     if ((csio->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_OUT)
468 	ac->ac_flags |= AMR_CMD_CCB_DATAOUT;
469 
470     ac->ac_private = csio;
471     if ( sc->support_ext_cdb ) {
472 	    ac->ac_data = aep;
473 	    ac->ac_length = sizeof(*aep);
474 	    ac->ac_complete = amr_cam_complete_extcdb;
475 	    ac->ac_mailbox.mb_command = AMR_CMD_EXTPASS;
476     } else {
477 	    ac->ac_data = ap;
478 	    ac->ac_length = sizeof(*ap);
479 	    ac->ac_complete = amr_cam_complete;
480 	    ac->ac_mailbox.mb_command = AMR_CMD_PASS;
481     }
482 
483 out:
484     if (error != 0) {
485 	if (ac != NULL)
486 	    amr_releasecmd(ac);
487 	if (ap != NULL)
488 	    free(ap, M_DEVBUF);
489 	if (aep != NULL)
490 	    free(aep, M_DEVBUF);
491 	if (csio != NULL)			/* put it back and try again later */
492 	    amr_requeue_ccb(sc, (union ccb *)csio);
493     }
494     *acp = ac;
495     return(error);
496 }
497 
498 /********************************************************************************
499  * Check for interrupt status
500  */
501 static void
502 amr_cam_poll(struct cam_sim *sim)
503 {
504     amr_done(cam_sim_softc(sim));
505 }
506 
507  /********************************************************************************
508  * Handle completion of a command submitted via CAM.
509  */
510 static void
511 amr_cam_complete(struct amr_command *ac)
512 {
513     struct amr_passthrough      *ap = (struct amr_passthrough *)ac->ac_data;
514     struct ccb_scsiio           *csio = (struct ccb_scsiio *)ac->ac_private;
515     struct scsi_inquiry_data    *inq = (struct scsi_inquiry_data *)csio->data_ptr;
516 
517     /* XXX note that we're ignoring ac->ac_status - good idea? */
518 
519     debug(1, "status 0x%x  scsi_status 0x%x", ac->ac_status, ap->ap_scsi_status);
520 
521     /*
522      * Hide disks from CAM so that they're not picked up and treated as 'normal' disks.
523      *
524      * If the configuration provides a mechanism to mark a disk a "not managed", we
525      * could add handling for that to allow disks to be selectively visible.
526      */
527 
528     if ((ap->ap_cdb[0] == INQUIRY) && (SID_TYPE(inq) == T_DIRECT)) {
529 	bzero(csio->data_ptr, csio->dxfer_len);
530 	if (ap->ap_scsi_status == 0xf0) {
531 	    csio->ccb_h.status = CAM_SCSI_STATUS_ERROR;
532 	} else {
533 	    csio->ccb_h.status = CAM_DEV_NOT_THERE;
534 	}
535     } else {
536 
537 	/* handle passthrough SCSI status */
538 	switch(ap->ap_scsi_status) {
539 	case 0:				/* completed OK */
540 	    csio->ccb_h.status = CAM_REQ_CMP;
541 	    break;
542 
543 	case 0x02:
544 	    csio->ccb_h.status = CAM_SCSI_STATUS_ERROR;
545 	    csio->scsi_status = SCSI_STATUS_CHECK_COND;
546 	    bcopy(ap->ap_request_sense_area, &csio->sense_data, AMR_MAX_REQ_SENSE_LEN);
547 	    csio->sense_len = AMR_MAX_REQ_SENSE_LEN;
548 	    csio->ccb_h.status |= CAM_AUTOSNS_VALID;
549 	    break;
550 
551 	case 0x08:
552 	    csio->ccb_h.status = CAM_SCSI_BUSY;
553 	    break;
554 
555 	case 0xf0:
556 	case 0xf4:
557 	default:
558 	    csio->ccb_h.status = CAM_REQ_CMP_ERR;
559 	    break;
560 	}
561     }
562     free(ap, M_DEVBUF);
563     if ((csio->ccb_h.flags & CAM_DIR_MASK) != CAM_DIR_NONE)
564 	debug(2, "%*D\n", imin(csio->dxfer_len, 16), csio->data_ptr, " ");
565     xpt_done((union ccb *)csio);
566     amr_releasecmd(ac);
567 }
568 
569 /********************************************************************************
570  * Handle completion of a command submitted via CAM.
571  * Completion for extended cdb
572  */
573 static void
574 amr_cam_complete_extcdb(struct amr_command *ac)
575 {
576     struct amr_ext_passthrough      *aep = (struct amr_ext_passthrough *)ac->ac_data;
577     struct ccb_scsiio           *csio = (struct ccb_scsiio *)ac->ac_private;
578     struct scsi_inquiry_data    *inq = (struct scsi_inquiry_data *)csio->data_ptr;
579 
580     /* XXX note that we're ignoring ac->ac_status - good idea? */
581 
582     debug(1, "status 0x%x  scsi_status 0x%x", ac->ac_status, aep->ap_scsi_status);
583 
584     /*
585      * Hide disks from CAM so that they're not picked up and treated as 'normal' disks.
586      *
587      * If the configuration provides a mechanism to mark a disk a "not managed", we
588      * could add handling for that to allow disks to be selectively visible.
589      */
590 
591     if ((aep->ap_cdb[0] == INQUIRY) && (SID_TYPE(inq) == T_DIRECT)) {
592 	bzero(csio->data_ptr, csio->dxfer_len);
593 	if (aep->ap_scsi_status == 0xf0) {
594 	    csio->ccb_h.status = CAM_SCSI_STATUS_ERROR;
595 	} else {
596 	    csio->ccb_h.status = CAM_DEV_NOT_THERE;
597 	}
598     } else {
599 
600 	/* handle passthrough SCSI status */
601 	switch(aep->ap_scsi_status) {
602 	case 0:				/* completed OK */
603 	    csio->ccb_h.status = CAM_REQ_CMP;
604 	    break;
605 
606 	case 0x02:
607 	    csio->ccb_h.status = CAM_SCSI_STATUS_ERROR;
608 	    csio->scsi_status = SCSI_STATUS_CHECK_COND;
609 	    bcopy(aep->ap_request_sense_area, &csio->sense_data, AMR_MAX_REQ_SENSE_LEN);
610 	    csio->sense_len = AMR_MAX_REQ_SENSE_LEN;
611 	    csio->ccb_h.status |= CAM_AUTOSNS_VALID;
612 	    break;
613 
614 	case 0x08:
615 	    csio->ccb_h.status = CAM_SCSI_BUSY;
616 	    break;
617 
618 	case 0xf0:
619 	case 0xf4:
620 	default:
621 	    csio->ccb_h.status = CAM_REQ_CMP_ERR;
622 	    break;
623 	}
624     }
625     free(aep, M_DEVBUF);
626     if ((csio->ccb_h.flags & CAM_DIR_MASK) != CAM_DIR_NONE)
627 	debug(2, "%*D\n", imin(csio->dxfer_len, 16), csio->data_ptr, " ");
628     xpt_done((union ccb *)csio);
629     amr_releasecmd(ac);
630 }
631