Bring in some CAM bug fixes from FreeBSD.
[dragonfly.git] / sys / bus / cam / cam_periph.c
1 /*
2  * Common functions for CAM "type" (peripheral) drivers.
3  *
4  * Copyright (c) 1997, 1998 Justin T. Gibbs.
5  * Copyright (c) 1997, 1998, 1999, 2000 Kenneth D. Merry.
6  * All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions, and the following disclaimer,
13  *    without modification, immediately at the beginning of the file.
14  * 2. The name of the author may not be used to endorse or promote products
15  *    derived from this software without specific prior written permission.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
21  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27  * SUCH DAMAGE.
28  *
29  * $FreeBSD: src/sys/cam/cam_periph.c,v 1.24.2.3 2003/01/25 19:04:40 dillon Exp $
30  * $DragonFly: src/sys/bus/cam/cam_periph.c,v 1.9 2005/03/15 20:42:12 dillon Exp $
31  */
32
33 #include <sys/param.h>
34 #include <sys/systm.h>
35 #include <sys/types.h>
36 #include <sys/malloc.h>
37 #include <sys/linker_set.h>
38 #include <sys/buf.h>
39 #include <sys/proc.h>
40 #include <sys/devicestat.h>
41 #include <sys/bus.h>
42 #include <vm/vm.h>
43 #include <vm/vm_extern.h>
44
45 #include "cam.h"
46 #include "cam_ccb.h"
47 #include "cam_xpt_periph.h"
48 #include "cam_periph.h"
49 #include "cam_debug.h"
50
51 #include <bus/cam/scsi/scsi_all.h>
52 #include <bus/cam/scsi/scsi_message.h>
53 #include <bus/cam/scsi/scsi_da.h>
54 #include <bus/cam/scsi/scsi_pass.h>
55
56 static  u_int           camperiphnextunit(struct periph_driver *p_drv,
57                                           u_int newunit, int wired,
58                                           path_id_t pathid, target_id_t target,
59                                           lun_id_t lun);
60 static  u_int           camperiphunit(struct periph_driver *p_drv,
61                                       path_id_t pathid, target_id_t target,
62                                       lun_id_t lun); 
63 static  void            camperiphdone(struct cam_periph *periph, 
64                                         union ccb *done_ccb);
65 static  void            camperiphfree(struct cam_periph *periph);
66
67 cam_status
68 cam_periph_alloc(periph_ctor_t *periph_ctor,
69                  periph_oninv_t *periph_oninvalidate,
70                  periph_dtor_t *periph_dtor, periph_start_t *periph_start,
71                  char *name, cam_periph_type type, struct cam_path *path,
72                  ac_callback_t *ac_callback, ac_code code, void *arg)
73 {
74         struct          periph_driver **p_drv;
75         struct          cam_periph *periph;
76         struct          cam_periph *cur_periph;
77         path_id_t       path_id;
78         target_id_t     target_id;
79         lun_id_t        lun_id;
80         cam_status      status;
81         u_int           init_level;
82         int s;
83
84         init_level = 0;
85         /*
86          * Handle Hot-Plug scenarios.  If there is already a peripheral
87          * of our type assigned to this path, we are likely waiting for
88          * final close on an old, invalidated, peripheral.  If this is
89          * the case, queue up a deferred call to the peripheral's async
90          * handler.  If it looks like a mistaken re-alloation, complain.
91          */
92         if ((periph = cam_periph_find(path, name)) != NULL) {
93
94                 if ((periph->flags & CAM_PERIPH_INVALID) != 0
95                  && (periph->flags & CAM_PERIPH_NEW_DEV_FOUND) == 0) {
96                         periph->flags |= CAM_PERIPH_NEW_DEV_FOUND;
97                         periph->deferred_callback = ac_callback;
98                         periph->deferred_ac = code;
99                         return (CAM_REQ_INPROG);
100                 } else {
101                         printf("cam_periph_alloc: attempt to re-allocate "
102                                "valid device %s%d rejected\n",
103                                periph->periph_name, periph->unit_number);
104                 }
105                 return (CAM_REQ_INVALID);
106         }
107         
108         periph = malloc(sizeof(*periph), M_DEVBUF, M_INTWAIT);
109         
110         init_level++;
111
112         SET_FOREACH(p_drv, periphdriver_set) {
113                 if (strcmp((*p_drv)->driver_name, name) == 0)
114                         break;
115         }
116         
117         path_id = xpt_path_path_id(path);
118         target_id = xpt_path_target_id(path);
119         lun_id = xpt_path_lun_id(path);
120         bzero(periph, sizeof(*periph));
121         cam_init_pinfo(&periph->pinfo);
122         periph->periph_start = periph_start;
123         periph->periph_dtor = periph_dtor;
124         periph->periph_oninval = periph_oninvalidate;
125         periph->type = type;
126         periph->periph_name = name;
127         periph->unit_number = camperiphunit(*p_drv, path_id, target_id, lun_id);
128         periph->immediate_priority = CAM_PRIORITY_NONE;
129         periph->refcount = 0;
130         SLIST_INIT(&periph->ccb_list);
131         status = xpt_create_path(&path, periph, path_id, target_id, lun_id);
132         if (status != CAM_REQ_CMP)
133                 goto failure;
134
135         periph->path = path;
136         init_level++;
137
138         status = xpt_add_periph(periph);
139
140         if (status != CAM_REQ_CMP)
141                 goto failure;
142
143         s = splsoftcam();
144         cur_periph = TAILQ_FIRST(&(*p_drv)->units);
145         while (cur_periph != NULL
146             && cur_periph->unit_number < periph->unit_number)
147                 cur_periph = TAILQ_NEXT(cur_periph, unit_links);
148
149         if (cur_periph != NULL)
150                 TAILQ_INSERT_BEFORE(cur_periph, periph, unit_links);
151         else {
152                 TAILQ_INSERT_TAIL(&(*p_drv)->units, periph, unit_links);
153                 (*p_drv)->generation++;
154         }
155
156         splx(s);
157
158         init_level++;
159
160         status = periph_ctor(periph, arg);
161
162         if (status == CAM_REQ_CMP)
163                 init_level++;
164
165 failure:
166         switch (init_level) {
167         case 4:
168                 /* Initialized successfully */
169                 break;
170         case 3:
171                 s = splsoftcam();
172                 TAILQ_REMOVE(&(*p_drv)->units, periph, unit_links);
173                 splx(s);
174                 xpt_remove_periph(periph);
175         case 2:
176                 xpt_free_path(periph->path);
177         case 1:
178                 free(periph, M_DEVBUF);
179         case 0:
180                 /* No cleanup to perform. */
181                 break;
182         default:
183                 panic("cam_periph_alloc: Unkown init level");
184         }
185         return(status);
186 }
187
188 /*
189  * Find a peripheral structure with the specified path, target, lun, 
190  * and (optionally) type.  If the name is NULL, this function will return
191  * the first peripheral driver that matches the specified path.
192  */
193 struct cam_periph *
194 cam_periph_find(struct cam_path *path, char *name)
195 {
196         struct periph_driver **p_drv;
197         struct cam_periph *periph;
198         int s;
199
200         SET_FOREACH(p_drv, periphdriver_set) {
201                 if (name != NULL && (strcmp((*p_drv)->driver_name, name) != 0))
202                         continue;
203
204                 s = splsoftcam();
205                 for (periph = TAILQ_FIRST(&(*p_drv)->units); periph != NULL;
206                      periph = TAILQ_NEXT(periph, unit_links)) {
207                         if (xpt_path_comp(periph->path, path) == 0) {
208                                 splx(s);
209                                 return(periph);
210                         }
211                 }
212                 splx(s);
213                 if (name != NULL)
214                         return(NULL);
215         }
216         return(NULL);
217 }
218
219 cam_status
220 cam_periph_acquire(struct cam_periph *periph)
221 {
222         int s;
223
224         if (periph == NULL)
225                 return(CAM_REQ_CMP_ERR);
226
227         s = splsoftcam();
228         periph->refcount++;
229         splx(s);
230
231         return(CAM_REQ_CMP);
232 }
233
234 void
235 cam_periph_release(struct cam_periph *periph)
236 {
237         int s;
238
239         if (periph == NULL)
240                 return;
241
242         s = splsoftcam();
243         if ((--periph->refcount == 0)
244          && (periph->flags & CAM_PERIPH_INVALID)) {
245                 camperiphfree(periph);
246         }
247         splx(s);
248
249 }
250
251 /*
252  * Look for the next unit number that is not currently in use for this
253  * peripheral type starting at "newunit".  Also exclude unit numbers that
254  * are reserved by for future "hardwiring" unless we already know that this
255  * is a potential wired device.  Only assume that the device is "wired" the
256  * first time through the loop since after that we'll be looking at unit
257  * numbers that did not match a wiring entry.
258  */
259 static u_int
260 camperiphnextunit(struct periph_driver *p_drv, u_int newunit, int wired,
261                   path_id_t pathid, target_id_t target, lun_id_t lun)
262 {
263         struct  cam_periph *periph;
264         char    *periph_name, *strval;
265         int     s;
266         int     i, val, dunit;
267         const char *dname;
268
269         s = splsoftcam();
270         periph_name = p_drv->driver_name;
271         for (;;newunit++) {
272
273                 for (periph = TAILQ_FIRST(&p_drv->units);
274                      periph != NULL && periph->unit_number != newunit;
275                      periph = TAILQ_NEXT(periph, unit_links))
276                         ;
277
278                 if (periph != NULL && periph->unit_number == newunit) {
279                         if (wired != 0) {
280                                 xpt_print_path(periph->path);
281                                 printf("Duplicate Wired Device entry!\n");
282                                 xpt_print_path(periph->path);
283                                 printf("Second device (%s device at scbus%d "
284                                        "target %d lun %d) will not be wired\n",
285                                        periph_name, pathid, target, lun);
286                                 wired = 0;
287                         }
288                         continue;
289                 }
290                 if (wired)
291                         break;
292
293                 /*
294                  * Don't match entries like "da 4" as a wired down
295                  * device, but do match entries like "da 4 target 5"
296                  * or even "da 4 scbus 1". 
297                  */
298                 i = -1;
299                 while ((i = resource_locate(i, periph_name)) != -1) {
300                         dname = resource_query_name(i);
301                         dunit = resource_query_unit(i);
302                         /* if no "target" and no specific scbus, skip */
303                         if (resource_int_value(dname, dunit, "target", &val) &&
304                             (resource_string_value(dname, dunit, "at",&strval)||
305                              strcmp(strval, "scbus") == 0))
306                                 continue;
307                         if (newunit == dunit)
308                                 break;
309                 }
310                 if (i == -1)
311                         break;
312         }
313         splx(s);
314         return (newunit);
315 }
316
317 static u_int
318 camperiphunit(struct periph_driver *p_drv, path_id_t pathid,
319               target_id_t target, lun_id_t lun)
320 {
321         u_int   unit;
322         int     hit, i, val, dunit;
323         const char *dname;
324         char    pathbuf[32], *strval, *periph_name;
325
326         unit = 0;
327
328         periph_name = p_drv->driver_name;
329         snprintf(pathbuf, sizeof(pathbuf), "scbus%d", pathid);
330         i = -1;
331         for (hit = 0; (i = resource_locate(i, periph_name)) != -1; hit = 0) {
332                 dname = resource_query_name(i);
333                 dunit = resource_query_unit(i);
334                 if (resource_string_value(dname, dunit, "at", &strval) == 0) {
335                         if (strcmp(strval, pathbuf) != 0)
336                                 continue;
337                         hit++;
338                 }
339                 if (resource_int_value(dname, dunit, "target", &val) == 0) {
340                         if (val != target)
341                                 continue;
342                         hit++;
343                 }
344                 if (resource_int_value(dname, dunit, "lun", &val) == 0) {
345                         if (val != lun)
346                                 continue;
347                         hit++;
348                 }
349                 if (hit != 0) {
350                         unit = dunit;
351                         break;
352                 }
353         }
354
355         /*
356          * Either start from 0 looking for the next unit or from
357          * the unit number given in the resource config.  This way,
358          * if we have wildcard matches, we don't return the same
359          * unit number twice.
360          */
361         unit = camperiphnextunit(p_drv, unit, /*wired*/hit, pathid,
362                                  target, lun);
363
364         return (unit);
365 }
366
367 void
368 cam_periph_invalidate(struct cam_periph *periph)
369 {
370         int s;
371
372         s = splsoftcam();
373         /*
374          * We only call this routine the first time a peripheral is
375          * invalidated.  The oninvalidate() routine is always called at
376          * splsoftcam().
377          */
378         if (((periph->flags & CAM_PERIPH_INVALID) == 0)
379          && (periph->periph_oninval != NULL))
380                 periph->periph_oninval(periph);
381
382         periph->flags |= CAM_PERIPH_INVALID;
383         periph->flags &= ~CAM_PERIPH_NEW_DEV_FOUND;
384
385         if (periph->refcount == 0)
386                 camperiphfree(periph);
387         else if (periph->refcount < 0)
388                 printf("cam_invalidate_periph: refcount < 0!!\n");
389         splx(s);
390 }
391
392 static void
393 camperiphfree(struct cam_periph *periph)
394 {
395         int s;
396         struct periph_driver **p_drv;
397
398         SET_FOREACH(p_drv, periphdriver_set) {
399                 if (strcmp((*p_drv)->driver_name, periph->periph_name) == 0)
400                         break;
401         }
402
403         if (*p_drv == NULL) {
404                 printf("camperiphfree: attempt to free "
405                         "non-existant periph: %s\n", periph->periph_name);
406                 return;
407         }
408         
409         if (periph->periph_dtor != NULL)
410                 periph->periph_dtor(periph);
411         
412         s = splsoftcam();
413         TAILQ_REMOVE(&(*p_drv)->units, periph, unit_links);
414         (*p_drv)->generation++;
415         splx(s);
416
417         xpt_remove_periph(periph);
418
419         if (periph->flags & CAM_PERIPH_NEW_DEV_FOUND) {
420                 union ccb ccb;
421                 void *arg;
422
423                 switch (periph->deferred_ac) {
424                 case AC_FOUND_DEVICE:
425                         ccb.ccb_h.func_code = XPT_GDEV_TYPE;
426                         xpt_setup_ccb(&ccb.ccb_h, periph->path, /*priority*/ 1);
427                         xpt_action(&ccb);
428                         arg = &ccb;
429                         break;
430                 case AC_PATH_REGISTERED:
431                         ccb.ccb_h.func_code = XPT_PATH_INQ;
432                         xpt_setup_ccb(&ccb.ccb_h, periph->path, /*priority*/ 1);
433                         xpt_action(&ccb);
434                         arg = &ccb;
435                         break;
436                 default:
437                         arg = NULL;
438                         break;
439                 }
440                 periph->deferred_callback(NULL, periph->deferred_ac,
441                                           periph->path, arg);
442         }
443         xpt_free_path(periph->path);
444         free(periph, M_DEVBUF);
445 }
446
447 /*
448  * Wait interruptibly for an exclusive lock.
449  */
450 int
451 cam_periph_lock(struct cam_periph *periph, int flags)
452 {
453         int error;
454
455         while ((periph->flags & CAM_PERIPH_LOCKED) != 0) {
456                 periph->flags |= CAM_PERIPH_LOCK_WANTED;
457                 if ((error = tsleep(periph, flags, "caplck", 0)) != 0)
458                         return error;
459         }
460
461         if (cam_periph_acquire(periph) != CAM_REQ_CMP)
462                 return(ENXIO);
463
464         periph->flags |= CAM_PERIPH_LOCKED;
465         return 0;
466 }
467
468 /*
469  * Unlock and wake up any waiters.
470  */
471 void
472 cam_periph_unlock(struct cam_periph *periph)
473 {
474         periph->flags &= ~CAM_PERIPH_LOCKED;
475         if ((periph->flags & CAM_PERIPH_LOCK_WANTED) != 0) {
476                 periph->flags &= ~CAM_PERIPH_LOCK_WANTED;
477                 wakeup(periph);
478         }
479
480         cam_periph_release(periph);
481 }
482
483 /*
484  * Map user virtual pointers into kernel virtual address space, so we can
485  * access the memory.  This won't work on physical pointers, for now it's
486  * up to the caller to check for that.  (XXX KDM -- should we do that here
487  * instead?)  This also only works for up to MAXPHYS memory.  Since we use
488  * buffers to map stuff in and out, we're limited to the buffer size.
489  */
490 int
491 cam_periph_mapmem(union ccb *ccb, struct cam_periph_map_info *mapinfo)
492 {
493         int numbufs, i, j;
494         int flags[CAM_PERIPH_MAXMAPS];
495         u_int8_t **data_ptrs[CAM_PERIPH_MAXMAPS];
496         u_int32_t lengths[CAM_PERIPH_MAXMAPS];
497         u_int32_t dirs[CAM_PERIPH_MAXMAPS];
498
499         switch(ccb->ccb_h.func_code) {
500         case XPT_DEV_MATCH:
501                 if (ccb->cdm.match_buf_len == 0) {
502                         printf("cam_periph_mapmem: invalid match buffer "
503                                "length 0\n");
504                         return(EINVAL);
505                 }
506                 if (ccb->cdm.pattern_buf_len > 0) {
507                         data_ptrs[0] = (u_int8_t **)&ccb->cdm.patterns;
508                         lengths[0] = ccb->cdm.pattern_buf_len;
509                         dirs[0] = CAM_DIR_OUT;
510                         data_ptrs[1] = (u_int8_t **)&ccb->cdm.matches;
511                         lengths[1] = ccb->cdm.match_buf_len;
512                         dirs[1] = CAM_DIR_IN;
513                         numbufs = 2;
514                 } else {
515                         data_ptrs[0] = (u_int8_t **)&ccb->cdm.matches;
516                         lengths[0] = ccb->cdm.match_buf_len;
517                         dirs[0] = CAM_DIR_IN;
518                         numbufs = 1;
519                 }
520                 break;
521         case XPT_SCSI_IO:
522         case XPT_CONT_TARGET_IO:
523                 if ((ccb->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_NONE)
524                         return(0);
525
526                 data_ptrs[0] = &ccb->csio.data_ptr;
527                 lengths[0] = ccb->csio.dxfer_len;
528                 dirs[0] = ccb->ccb_h.flags & CAM_DIR_MASK;
529                 numbufs = 1;
530                 break;
531         default:
532                 return(EINVAL);
533                 break; /* NOTREACHED */
534         }
535
536         /*
537          * Check the transfer length and permissions first, so we don't
538          * have to unmap any previously mapped buffers.
539          */
540         for (i = 0; i < numbufs; i++) {
541
542                 flags[i] = 0;
543
544                 /*
545                  * The userland data pointer passed in may not be page
546                  * aligned.  vmapbuf() truncates the address to a page
547                  * boundary, so if the address isn't page aligned, we'll
548                  * need enough space for the given transfer length, plus
549                  * whatever extra space is necessary to make it to the page
550                  * boundary.
551                  */
552                 if ((lengths[i] +
553                     (((vm_offset_t)(*data_ptrs[i])) & PAGE_MASK)) > DFLTPHYS){
554                         printf("cam_periph_mapmem: attempt to map %lu bytes, "
555                                "which is greater than DFLTPHYS(%d)\n",
556                                (long)(lengths[i] +
557                                (((vm_offset_t)(*data_ptrs[i])) & PAGE_MASK)),
558                                DFLTPHYS);
559                         return(E2BIG);
560                 }
561
562                 if (dirs[i] & CAM_DIR_OUT) {
563                         flags[i] = B_WRITE;
564                         if (!useracc(*data_ptrs[i], lengths[i], 
565                                      VM_PROT_READ)) {
566                                 printf("cam_periph_mapmem: error, "
567                                         "address %p, length %lu isn't "
568                                         "user accessible for READ\n",
569                                         (void *)*data_ptrs[i],
570                                         (u_long)lengths[i]);
571                                 return(EACCES);
572                         }
573                 }
574
575                 /*
576                  * XXX this check is really bogus, since B_WRITE currently
577                  * is all 0's, and so it is "set" all the time.
578                  */
579                 if (dirs[i] & CAM_DIR_IN) {
580                         flags[i] |= B_READ;
581                         if (!useracc(*data_ptrs[i], lengths[i], 
582                                      VM_PROT_WRITE)) {
583                                 printf("cam_periph_mapmem: error, "
584                                         "address %p, length %lu isn't "
585                                         "user accessible for WRITE\n",
586                                         (void *)*data_ptrs[i],
587                                         (u_long)lengths[i]);
588
589                                 return(EACCES);
590                         }
591                 }
592
593         }
594
595         for (i = 0; i < numbufs; i++) {
596                 /*
597                  * Get the buffer.
598                  */
599                 mapinfo->bp[i] = getpbuf(NULL);
600
601                 /* save the buffer's data address */
602                 mapinfo->bp[i]->b_saveaddr = mapinfo->bp[i]->b_data;
603
604                 /* put our pointer in the data slot */
605                 mapinfo->bp[i]->b_data = *data_ptrs[i];
606
607                 /* set the transfer length, we know it's < DFLTPHYS */
608                 mapinfo->bp[i]->b_bufsize = lengths[i];
609
610                 /* set the flags */
611                 mapinfo->bp[i]->b_flags = flags[i] | B_PHYS;
612
613                 /* map the buffer into kernel memory */
614                 if (vmapbuf(mapinfo->bp[i]) < 0) {
615                         printf("cam_periph_mapmem: error, "
616                                 "address %p, length %lu isn't "
617                                 "user accessible any more\n",
618                                 (void *)*data_ptrs[i],
619                                 (u_long)lengths[i]);
620                         for (j = 0; j < i; ++j) {
621                                 *data_ptrs[j] = mapinfo->bp[j]->b_saveaddr;
622                                 mapinfo->bp[j]->b_flags &= ~B_PHYS;
623                                 relpbuf(mapinfo->bp[j], NULL);
624                         }
625                         return(EACCES);
626                 }
627
628                 /* set our pointer to the new mapped area */
629                 *data_ptrs[i] = mapinfo->bp[i]->b_data;
630
631                 mapinfo->num_bufs_used++;
632         }
633
634         return(0);
635 }
636
637 /*
638  * Unmap memory segments mapped into kernel virtual address space by
639  * cam_periph_mapmem().
640  */
641 void
642 cam_periph_unmapmem(union ccb *ccb, struct cam_periph_map_info *mapinfo)
643 {
644         int numbufs, i;
645         u_int8_t **data_ptrs[CAM_PERIPH_MAXMAPS];
646
647         if (mapinfo->num_bufs_used <= 0) {
648                 /* allow ourselves to be swapped once again */
649                 return;
650         }
651
652         switch (ccb->ccb_h.func_code) {
653         case XPT_DEV_MATCH:
654                 numbufs = min(mapinfo->num_bufs_used, 2);
655
656                 if (numbufs == 1) {
657                         data_ptrs[0] = (u_int8_t **)&ccb->cdm.matches;
658                 } else {
659                         data_ptrs[0] = (u_int8_t **)&ccb->cdm.patterns;
660                         data_ptrs[1] = (u_int8_t **)&ccb->cdm.matches;
661                 }
662                 break;
663         case XPT_SCSI_IO:
664         case XPT_CONT_TARGET_IO:
665                 data_ptrs[0] = &ccb->csio.data_ptr;
666                 numbufs = min(mapinfo->num_bufs_used, 1);
667                 break;
668         default:
669                 /* allow ourselves to be swapped once again */
670                 return;
671                 break; /* NOTREACHED */ 
672         }
673
674         for (i = 0; i < numbufs; i++) {
675                 /* Set the user's pointer back to the original value */
676                 *data_ptrs[i] = mapinfo->bp[i]->b_saveaddr;
677
678                 /* unmap the buffer */
679                 vunmapbuf(mapinfo->bp[i]);
680
681                 /* clear the flags we set above */
682                 mapinfo->bp[i]->b_flags &= ~B_PHYS;
683
684                 /* release the buffer */
685                 relpbuf(mapinfo->bp[i], NULL);
686         }
687
688         /* allow ourselves to be swapped once again */
689 }
690
691 union ccb *
692 cam_periph_getccb(struct cam_periph *periph, u_int32_t priority)
693 {
694         struct ccb_hdr *ccb_h;
695         int s;
696
697         CAM_DEBUG(periph->path, CAM_DEBUG_TRACE, ("entering cdgetccb\n"));
698
699         s = splsoftcam();
700         
701         while (periph->ccb_list.slh_first == NULL) {
702                 if (periph->immediate_priority > priority)
703                         periph->immediate_priority = priority;
704                 xpt_schedule(periph, priority);
705                 if ((periph->ccb_list.slh_first != NULL)
706                  && (periph->ccb_list.slh_first->pinfo.priority == priority))
707                         break;
708                 tsleep(&periph->ccb_list, 0, "cgticb", 0);
709         }
710
711         ccb_h = periph->ccb_list.slh_first;
712         SLIST_REMOVE_HEAD(&periph->ccb_list, periph_links.sle);
713         splx(s);
714         return ((union ccb *)ccb_h);
715 }
716
717 void
718 cam_periph_ccbwait(union ccb *ccb)
719 {
720         int s;
721
722         s = splsoftcam();
723         if ((ccb->ccb_h.pinfo.index != CAM_UNQUEUED_INDEX)
724          || ((ccb->ccb_h.status & CAM_STATUS_MASK) == CAM_REQ_INPROG))
725                 tsleep(&ccb->ccb_h.cbfcnp, 0, "cbwait", 0);
726
727         splx(s);
728 }
729
730 int
731 cam_periph_ioctl(struct cam_periph *periph, int cmd, caddr_t addr,
732                  int (*error_routine)(union ccb *ccb, 
733                                       cam_flags camflags,
734                                       u_int32_t sense_flags))
735 {
736         union ccb            *ccb;
737         int                  error;
738         int                  found;
739
740         error = found = 0;
741
742         switch(cmd){
743         case CAMGETPASSTHRU:
744                 ccb = cam_periph_getccb(periph, /* priority */ 1);
745                 xpt_setup_ccb(&ccb->ccb_h,
746                               ccb->ccb_h.path,
747                               /*priority*/1);
748                 ccb->ccb_h.func_code = XPT_GDEVLIST;
749
750                 /*
751                  * Basically, the point of this is that we go through
752                  * getting the list of devices, until we find a passthrough
753                  * device.  In the current version of the CAM code, the
754                  * only way to determine what type of device we're dealing
755                  * with is by its name.
756                  */
757                 while (found == 0) {
758                         ccb->cgdl.index = 0;
759                         ccb->cgdl.status = CAM_GDEVLIST_MORE_DEVS;
760                         while (ccb->cgdl.status == CAM_GDEVLIST_MORE_DEVS) {
761
762                                 /* we want the next device in the list */
763                                 xpt_action(ccb);
764                                 if (strncmp(ccb->cgdl.periph_name, 
765                                     "pass", 4) == 0){
766                                         found = 1;
767                                         break;
768                                 }
769                         }
770                         if ((ccb->cgdl.status == CAM_GDEVLIST_LAST_DEVICE) &&
771                             (found == 0)) {
772                                 ccb->cgdl.periph_name[0] = '\0';
773                                 ccb->cgdl.unit_number = 0;
774                                 break;
775                         }
776                 }
777
778                 /* copy the result back out */  
779                 bcopy(ccb, addr, sizeof(union ccb));
780
781                 /* and release the ccb */
782                 xpt_release_ccb(ccb);
783
784                 break;
785         default:
786                 error = ENOTTY;
787                 break;
788         }
789         return(error);
790 }
791
792 int
793 cam_periph_runccb(union ccb *ccb,
794                   int (*error_routine)(union ccb *ccb,
795                                        cam_flags camflags,
796                                        u_int32_t sense_flags),
797                   cam_flags camflags, u_int32_t sense_flags,
798                   struct devstat *ds)
799 {
800         int error;
801  
802         error = 0;
803         
804         /*
805          * If the user has supplied a stats structure, and if we understand
806          * this particular type of ccb, record the transaction start.
807          */
808         if ((ds != NULL) && (ccb->ccb_h.func_code == XPT_SCSI_IO))
809                 devstat_start_transaction(ds);
810
811         xpt_action(ccb);
812  
813         do {
814                 cam_periph_ccbwait(ccb);
815                 if ((ccb->ccb_h.status & CAM_STATUS_MASK) == CAM_REQ_CMP)
816                         error = 0;
817                 else if (error_routine != NULL)
818                         error = (*error_routine)(ccb, camflags, sense_flags);
819                 else
820                         error = 0;
821
822         } while (error == ERESTART);
823           
824         if ((ccb->ccb_h.status & CAM_DEV_QFRZN) != 0) 
825                 cam_release_devq(ccb->ccb_h.path,
826                                  /* relsim_flags */0,
827                                  /* openings */0,
828                                  /* timeout */0,
829                                  /* getcount_only */ FALSE);
830
831         if ((ds != NULL) && (ccb->ccb_h.func_code == XPT_SCSI_IO))
832                 devstat_end_transaction(ds,
833                                         ccb->csio.dxfer_len,
834                                         ccb->csio.tag_action & 0xf,
835                                         ((ccb->ccb_h.flags & CAM_DIR_MASK) ==
836                                         CAM_DIR_NONE) ?  DEVSTAT_NO_DATA : 
837                                         (ccb->ccb_h.flags & CAM_DIR_OUT) ?
838                                         DEVSTAT_WRITE : 
839                                         DEVSTAT_READ);
840
841         return(error);
842 }
843
844 void
845 cam_freeze_devq(struct cam_path *path)
846 {
847         struct ccb_hdr ccb_h;
848
849         xpt_setup_ccb(&ccb_h, path, /*priority*/1);
850         ccb_h.func_code = XPT_NOOP;
851         ccb_h.flags = CAM_DEV_QFREEZE;
852         xpt_action((union ccb *)&ccb_h);
853 }
854
855 u_int32_t
856 cam_release_devq(struct cam_path *path, u_int32_t relsim_flags,
857                  u_int32_t openings, u_int32_t timeout,
858                  int getcount_only)
859 {
860         struct ccb_relsim crs;
861
862         xpt_setup_ccb(&crs.ccb_h, path,
863                       /*priority*/1);
864         crs.ccb_h.func_code = XPT_REL_SIMQ;
865         crs.ccb_h.flags = getcount_only ? CAM_DEV_QFREEZE : 0;
866         crs.release_flags = relsim_flags;
867         crs.openings = openings;
868         crs.release_timeout = timeout;
869         xpt_action((union ccb *)&crs);
870         return (crs.qfrozen_cnt);
871 }
872
873 #define saved_ccb_ptr ppriv_ptr0
874 static void
875 camperiphdone(struct cam_periph *periph, union ccb *done_ccb)
876 {
877         cam_status      status;
878         int             frozen;
879         int             sense;
880         struct scsi_start_stop_unit *scsi_cmd;
881         u_int32_t       relsim_flags, timeout;
882         u_int32_t       qfrozen_cnt;
883
884         status = done_ccb->ccb_h.status;
885         frozen = (status & CAM_DEV_QFRZN) != 0;
886         sense  = (status & CAM_AUTOSNS_VALID) != 0;
887         status &= CAM_STATUS_MASK;
888
889         timeout = 0;
890         relsim_flags = 0;
891
892         /* 
893          * Unfreeze the queue once if it is already frozen..
894          */
895         if (frozen != 0) {
896                 qfrozen_cnt = cam_release_devq(done_ccb->ccb_h.path,
897                                               /*relsim_flags*/0,
898                                               /*openings*/0,
899                                               /*timeout*/0,
900                                               /*getcount_only*/0);
901         }
902
903         switch (status) {
904
905         case CAM_REQ_CMP:
906
907                 /*
908                  * If we have successfully taken a device from the not
909                  * ready to ready state, re-scan the device and re-get the
910                  * inquiry information.  Many devices (mostly disks) don't
911                  * properly report their inquiry information unless they
912                  * are spun up.
913                  */
914                 if (done_ccb->ccb_h.func_code == XPT_SCSI_IO) {
915                         scsi_cmd = (struct scsi_start_stop_unit *)
916                                         &done_ccb->csio.cdb_io.cdb_bytes;
917
918                         if (scsi_cmd->opcode == START_STOP_UNIT)
919                                 xpt_async(AC_INQ_CHANGED,
920                                           done_ccb->ccb_h.path, NULL);
921                 }
922                 bcopy(done_ccb->ccb_h.saved_ccb_ptr, done_ccb,
923                       sizeof(union ccb));
924
925                 periph->flags &= ~CAM_PERIPH_RECOVERY_INPROG;
926
927                 xpt_action(done_ccb);
928
929                 break;
930         case CAM_SCSI_STATUS_ERROR:
931                 scsi_cmd = (struct scsi_start_stop_unit *)
932                                 &done_ccb->csio.cdb_io.cdb_bytes;
933                 if (sense != 0) {
934                         struct scsi_sense_data *sense;
935                         int    error_code, sense_key, asc, ascq;        
936
937                         sense = &done_ccb->csio.sense_data;
938                         scsi_extract_sense(sense, &error_code, 
939                                            &sense_key, &asc, &ascq);
940
941                         /*
942                          * If the error is "invalid field in CDB", 
943                          * and the load/eject flag is set, turn the 
944                          * flag off and try again.  This is just in 
945                          * case the drive in question barfs on the 
946                          * load eject flag.  The CAM code should set 
947                          * the load/eject flag by default for 
948                          * removable media.
949                          */
950
951                         /* XXX KDM 
952                          * Should we check to see what the specific
953                          * scsi status is??  Or does it not matter
954                          * since we already know that there was an
955                          * error, and we know what the specific
956                          * error code was, and we know what the
957                          * opcode is..
958                          */
959                         if ((scsi_cmd->opcode == START_STOP_UNIT) &&
960                             ((scsi_cmd->how & SSS_LOEJ) != 0) &&
961                              (asc == 0x24) && (ascq == 0x00) &&
962                              (done_ccb->ccb_h.retry_count > 0)) {
963
964                                 scsi_cmd->how &= ~SSS_LOEJ;
965
966                                 xpt_action(done_ccb);
967
968                         } else if (done_ccb->ccb_h.retry_count > 0) {
969                                 /*
970                                  * In this case, the error recovery
971                                  * command failed, but we've got 
972                                  * some retries left on it.  Give
973                                  * it another try.
974                                  */
975
976                                 /* set the timeout to .5 sec */
977                                 relsim_flags =
978                                         RELSIM_RELEASE_AFTER_TIMEOUT;
979                                 timeout = 500;
980
981                                 xpt_action(done_ccb);
982
983                                 break;
984
985                         } else {
986                                 /* 
987                                  * Copy the original CCB back and
988                                  * send it back to the caller.
989                                  */
990                                 bcopy(done_ccb->ccb_h.saved_ccb_ptr,            
991                                       done_ccb, sizeof(union ccb));
992
993                                 periph->flags &= ~CAM_PERIPH_RECOVERY_INPROG;
994
995                                 xpt_action(done_ccb);
996                         }
997                 } else {
998                         /*
999                          * Eh??  The command failed, but we don't
1000                          * have any sense.  What's up with that?
1001                          * Fire the CCB again to return it to the
1002                          * caller.
1003                          */
1004                         bcopy(done_ccb->ccb_h.saved_ccb_ptr,
1005                               done_ccb, sizeof(union ccb));
1006
1007                         periph->flags &= ~CAM_PERIPH_RECOVERY_INPROG;
1008
1009                         xpt_action(done_ccb);
1010
1011                 }
1012                 break;
1013         default:
1014                 bcopy(done_ccb->ccb_h.saved_ccb_ptr, done_ccb,
1015                       sizeof(union ccb));
1016
1017                 periph->flags &= ~CAM_PERIPH_RECOVERY_INPROG;
1018
1019                 xpt_action(done_ccb);
1020
1021                 break;
1022         }
1023
1024         /* decrement the retry count */
1025         if (done_ccb->ccb_h.retry_count > 0)
1026                 done_ccb->ccb_h.retry_count--;
1027
1028         qfrozen_cnt = cam_release_devq(done_ccb->ccb_h.path,
1029                                       /*relsim_flags*/relsim_flags,
1030                                       /*openings*/0,
1031                                       /*timeout*/timeout,
1032                                       /*getcount_only*/0);
1033 }
1034
1035 /*
1036  * Generic Async Event handler.  Peripheral drivers usually
1037  * filter out the events that require personal attention,
1038  * and leave the rest to this function.
1039  */
1040 void
1041 cam_periph_async(struct cam_periph *periph, u_int32_t code,
1042                  struct cam_path *path, void *arg)
1043 {
1044         switch (code) {
1045         case AC_LOST_DEVICE:
1046                 cam_periph_invalidate(periph);
1047                 break; 
1048         case AC_SENT_BDR:
1049         case AC_BUS_RESET:
1050         {
1051                 cam_periph_bus_settle(periph, SCSI_DELAY);
1052                 break;
1053         }
1054         default:
1055                 break;
1056         }
1057 }
1058
1059 void
1060 cam_periph_bus_settle(struct cam_periph *periph, u_int bus_settle)
1061 {
1062         struct ccb_getdevstats cgds;
1063
1064         xpt_setup_ccb(&cgds.ccb_h, periph->path, /*priority*/1);
1065         cgds.ccb_h.func_code = XPT_GDEV_STATS;
1066         xpt_action((union ccb *)&cgds);
1067         cam_periph_freeze_after_event(periph, &cgds.last_reset, bus_settle);
1068 }
1069
1070 void
1071 cam_periph_freeze_after_event(struct cam_periph *periph,
1072                               struct timeval* event_time, u_int duration_ms)
1073 {
1074         struct timeval delta;
1075         struct timeval duration_tv;
1076
1077         microuptime(&delta);
1078         timevalsub(&delta, event_time);
1079         duration_tv.tv_sec = duration_ms / 1000;
1080         duration_tv.tv_usec = (duration_ms % 1000) * 1000;
1081         if (timevalcmp(&delta, &duration_tv, <)) {
1082                 timevalsub(&duration_tv, &delta);
1083
1084                 duration_ms = duration_tv.tv_sec * 1000;
1085                 duration_ms += duration_tv.tv_usec / 1000;
1086                 cam_freeze_devq(periph->path); 
1087                 cam_release_devq(periph->path,
1088                                 RELSIM_RELEASE_AFTER_TIMEOUT,
1089                                 /*reduction*/0,
1090                                 /*timeout*/duration_ms,
1091                                 /*getcount_only*/0);
1092         }
1093
1094 }
1095
1096 /*
1097  * Generic error handler.  Peripheral drivers usually filter
1098  * out the errors that they handle in a unique mannor, then
1099  * call this function.
1100  */
1101 int
1102 cam_periph_error(union ccb *ccb, cam_flags camflags,
1103                  u_int32_t sense_flags, union ccb *save_ccb)
1104 {
1105         cam_status status;
1106         int        frozen;
1107         int        sense;
1108         int        error;
1109         int        openings;
1110         int        retry;
1111         u_int32_t  relsim_flags;
1112         u_int32_t  timeout;
1113         
1114         status = ccb->ccb_h.status;
1115         frozen = (status & CAM_DEV_QFRZN) != 0;
1116         sense  = (status & CAM_AUTOSNS_VALID) != 0;
1117         status &= CAM_STATUS_MASK;
1118         relsim_flags = 0;
1119
1120         switch (status) {
1121         case CAM_REQ_CMP:
1122                 /* decrement the number of retries */
1123                 retry = ccb->ccb_h.retry_count > 0;
1124                 if (retry)
1125                         ccb->ccb_h.retry_count--;
1126                 error = 0;
1127                 break;
1128         case CAM_AUTOSENSE_FAIL:
1129         case CAM_SCSI_STATUS_ERROR:
1130
1131                 switch (ccb->csio.scsi_status) {
1132                 case SCSI_STATUS_OK:
1133                 case SCSI_STATUS_COND_MET:
1134                 case SCSI_STATUS_INTERMED:
1135                 case SCSI_STATUS_INTERMED_COND_MET:
1136                         error = 0;
1137                         break;
1138                 case SCSI_STATUS_CMD_TERMINATED:
1139                 case SCSI_STATUS_CHECK_COND:
1140                         if (sense != 0) {
1141                                 struct scsi_sense_data *sense;
1142                                 int    error_code, sense_key, asc, ascq;
1143                                 struct cam_periph *periph;
1144                                 scsi_sense_action err_action;
1145                                 struct ccb_getdev cgd;
1146
1147                                 sense = &ccb->csio.sense_data;
1148                                 scsi_extract_sense(sense, &error_code,
1149                                                    &sense_key, &asc, &ascq);
1150                                 periph = xpt_path_periph(ccb->ccb_h.path);
1151
1152                                 /*
1153                                  * Grab the inquiry data for this device.
1154                                  */
1155                                 xpt_setup_ccb(&cgd.ccb_h, ccb->ccb_h.path,
1156                                               /*priority*/ 1);
1157                                 cgd.ccb_h.func_code = XPT_GDEV_TYPE;
1158                                 xpt_action((union ccb *)&cgd);
1159
1160                                 err_action = scsi_error_action(asc, ascq, 
1161                                                                &cgd.inq_data);
1162
1163                                 /*
1164                                  * Send a Test Unit Ready to the device.
1165                                  * If the 'many' flag is set, we send 120
1166                                  * test unit ready commands, one every half 
1167                                  * second.  Otherwise, we just send one TUR.
1168                                  * We only want to do this if the retry 
1169                                  * count has not been exhausted.
1170                                  */
1171                                 if (((err_action & SS_MASK) == SS_TUR)
1172                                  && save_ccb != NULL 
1173                                  && ccb->ccb_h.retry_count > 0) {
1174
1175                                         /*
1176                                          * Since error recovery is already
1177                                          * in progress, don't attempt to
1178                                          * process this error.  It is probably
1179                                          * related to the error that caused
1180                                          * the currently active error recovery
1181                                          * action.  Also, we only have
1182                                          * space for one saved CCB, so if we
1183                                          * had two concurrent error recovery
1184                                          * actions, we would end up
1185                                          * over-writing one error recovery
1186                                          * CCB with another one.
1187                                          */
1188                                         if (periph->flags &
1189                                             CAM_PERIPH_RECOVERY_INPROG) {
1190                                                 error = ERESTART;
1191                                                 break;
1192                                         }
1193
1194                                         periph->flags |=
1195                                                 CAM_PERIPH_RECOVERY_INPROG;
1196
1197                                         /* decrement the number of retries */
1198                                         if ((err_action & 
1199                                              SSQ_DECREMENT_COUNT) != 0) {
1200                                                 retry = 1;
1201                                                 ccb->ccb_h.retry_count--;
1202                                         }
1203
1204                                         bcopy(ccb, save_ccb, sizeof(*save_ccb));
1205
1206                                         /*
1207                                          * We retry this one every half
1208                                          * second for a minute.  If the
1209                                          * device hasn't become ready in a
1210                                          * minute's time, it's unlikely to
1211                                          * ever become ready.  If the table
1212                                          * doesn't specify SSQ_MANY, we can
1213                                          * only try this once.  Oh well.
1214                                          */
1215                                         if ((err_action & SSQ_MANY) != 0)
1216                                                 scsi_test_unit_ready(&ccb->csio,
1217                                                                /*retries*/120,
1218                                                                camperiphdone,
1219                                                                MSG_SIMPLE_Q_TAG,
1220                                                                SSD_FULL_SIZE,
1221                                                                /*timeout*/5000);
1222                                         else
1223                                                 scsi_test_unit_ready(&ccb->csio,
1224                                                                /*retries*/1,
1225                                                                camperiphdone,
1226                                                                MSG_SIMPLE_Q_TAG,
1227                                                                SSD_FULL_SIZE,
1228                                                                /*timeout*/5000);
1229
1230                                         /* release the queue after .5 sec.  */
1231                                         relsim_flags = 
1232                                                 RELSIM_RELEASE_AFTER_TIMEOUT;
1233                                         timeout = 500;
1234                                         /*
1235                                          * Drop the priority to 0 so that 
1236                                          * we are the first to execute.  Also 
1237                                          * freeze the queue after this command 
1238                                          * is sent so that we can restore the 
1239                                          * old csio and have it queued in the 
1240                                          * proper order before we let normal 
1241                                          * transactions go to the drive.
1242                                          */
1243                                         ccb->ccb_h.pinfo.priority = 0;
1244                                         ccb->ccb_h.flags |= CAM_DEV_QFREEZE;
1245
1246                                         /*
1247                                          * Save a pointer to the original
1248                                          * CCB in the new CCB.
1249                                          */
1250                                         ccb->ccb_h.saved_ccb_ptr = save_ccb;
1251
1252                                         error = ERESTART;
1253                                 }
1254                                 /*
1255                                  * Send a start unit command to the device,
1256                                  * and then retry the command.  We only 
1257                                  * want to do this if the retry count has 
1258                                  * not been exhausted.  If the user 
1259                                  * specified 0 retries, then we follow 
1260                                  * their request and do not retry.
1261                                  */
1262                                 else if (((err_action & SS_MASK) == SS_START)
1263                                       && save_ccb != NULL 
1264                                       && ccb->ccb_h.retry_count > 0) {
1265                                         int le;
1266
1267                                         /*
1268                                          * Only one error recovery action
1269                                          * at a time.  See above.
1270                                          */
1271                                         if (periph->flags &
1272                                             CAM_PERIPH_RECOVERY_INPROG) {
1273                                                 error = ERESTART;
1274                                                 break;
1275                                         }
1276
1277                                         periph->flags |=
1278                                                 CAM_PERIPH_RECOVERY_INPROG;
1279
1280                                         /* decrement the number of retries */
1281                                         retry = 1;
1282                                         ccb->ccb_h.retry_count--;
1283
1284                                         /*
1285                                          * Check for removable media and
1286                                          * set load/eject flag
1287                                          * appropriately.
1288                                          */
1289                                         if (SID_IS_REMOVABLE(&cgd.inq_data))
1290                                                 le = TRUE;
1291                                         else
1292                                                 le = FALSE;
1293
1294                                         /*
1295                                          * Attempt to start the drive up.
1296                                          *
1297                                          * Save the current ccb so it can 
1298                                          * be restored and retried once the 
1299                                          * drive is started up.
1300                                          */
1301                                         bcopy(ccb, save_ccb, sizeof(*save_ccb));
1302
1303                                         scsi_start_stop(&ccb->csio,
1304                                                         /*retries*/1,
1305                                                         camperiphdone,
1306                                                         MSG_SIMPLE_Q_TAG,
1307                                                         /*start*/TRUE,
1308                                                         /*load/eject*/le,
1309                                                         /*immediate*/FALSE,
1310                                                         SSD_FULL_SIZE,
1311                                                         /*timeout*/50000);
1312                                         /*
1313                                          * Drop the priority to 0 so that 
1314                                          * we are the first to execute.  Also 
1315                                          * freeze the queue after this command 
1316                                          * is sent so that we can restore the 
1317                                          * old csio and have it queued in the 
1318                                          * proper order before we let normal 
1319                                          * transactions go to the drive.
1320                                          */
1321                                         ccb->ccb_h.pinfo.priority = 0;
1322                                         ccb->ccb_h.flags |= CAM_DEV_QFREEZE;
1323
1324                                         /*
1325                                          * Save a pointer to the original
1326                                          * CCB in the new CCB.
1327                                          */
1328                                         ccb->ccb_h.saved_ccb_ptr = save_ccb;
1329
1330                                         error = ERESTART;
1331                                 } else if ((sense_flags & SF_RETRY_UA) != 0) {
1332                                         /*
1333                                          * XXX KDM this is a *horrible*
1334                                          * hack.  
1335                                          */
1336                                         error = scsi_interpret_sense(ccb,
1337                                                                   sense_flags,
1338                                                                   &relsim_flags,
1339                                                                   &openings,
1340                                                                   &timeout,
1341                                                                   err_action);
1342                                 } 
1343
1344                                 /*
1345                                  * Theoretically, this code should send a
1346                                  * test unit ready to the given device, and 
1347                                  * if it returns and error, send a start 
1348                                  * unit command.  Since we don't yet have
1349                                  * the capability to do two-command error
1350                                  * recovery, just send a start unit.
1351                                  * XXX KDM fix this!
1352                                  */
1353                                 else if (((err_action & SS_MASK) == SS_TURSTART)
1354                                       && save_ccb != NULL
1355                                       && ccb->ccb_h.retry_count > 0) {
1356                                         int le;
1357
1358                                         /*
1359                                          * Only one error recovery action
1360                                          * at a time.  See above.
1361                                          */
1362                                         if (periph->flags &
1363                                             CAM_PERIPH_RECOVERY_INPROG) {
1364                                                 error = ERESTART;
1365                                                 break;
1366                                         }
1367
1368                                         periph->flags |=
1369                                                 CAM_PERIPH_RECOVERY_INPROG;
1370
1371                                         /* decrement the number of retries */
1372                                         retry = 1;
1373                                         ccb->ccb_h.retry_count--;
1374
1375                                         /*
1376                                          * Check for removable media and
1377                                          * set load/eject flag
1378                                          * appropriately.
1379                                          */
1380                                         if (SID_IS_REMOVABLE(&cgd.inq_data))
1381                                                 le = TRUE;
1382                                         else
1383                                                 le = FALSE;
1384
1385                                         /*
1386                                          * Attempt to start the drive up.
1387                                          *
1388                                          * Save the current ccb so it can 
1389                                          * be restored and retried once the 
1390                                          * drive is started up.
1391                                          */
1392                                         bcopy(ccb, save_ccb, sizeof(*save_ccb));
1393
1394                                         scsi_start_stop(&ccb->csio,
1395                                                         /*retries*/1,
1396                                                         camperiphdone,
1397                                                         MSG_SIMPLE_Q_TAG,
1398                                                         /*start*/TRUE,
1399                                                         /*load/eject*/le,
1400                                                         /*immediate*/FALSE,
1401                                                         SSD_FULL_SIZE,
1402                                                         /*timeout*/50000);
1403
1404                                         /* release the queue after .5 sec.  */
1405                                         relsim_flags = 
1406                                                 RELSIM_RELEASE_AFTER_TIMEOUT;
1407                                         timeout = 500;
1408                                         /*
1409                                          * Drop the priority to 0 so that 
1410                                          * we are the first to execute.  Also 
1411                                          * freeze the queue after this command 
1412                                          * is sent so that we can restore the 
1413                                          * old csio and have it queued in the 
1414                                          * proper order before we let normal 
1415                                          * transactions go to the drive.
1416                                          */
1417                                         ccb->ccb_h.pinfo.priority = 0;
1418                                         ccb->ccb_h.flags |= CAM_DEV_QFREEZE;
1419
1420                                         /*
1421                                          * Save a pointer to the original
1422                                          * CCB in the new CCB.
1423                                          */
1424                                         ccb->ccb_h.saved_ccb_ptr = save_ccb;
1425
1426                                         error = ERESTART;
1427                                 } else {
1428                                         error = scsi_interpret_sense(ccb,
1429                                                                   sense_flags,
1430                                                                   &relsim_flags,
1431                                                                   &openings,
1432                                                                   &timeout,
1433                                                                   err_action);
1434                                 }
1435                         } else if (ccb->csio.scsi_status == 
1436                                    SCSI_STATUS_CHECK_COND
1437                                 && status != CAM_AUTOSENSE_FAIL) {
1438                                 /* no point in decrementing the retry count */
1439                                 panic("cam_periph_error: scsi status of "
1440                                       "CHECK COND returned but no sense "
1441                                       "information is availible.  "
1442                                       "Controller should have returned "
1443                                       "CAM_AUTOSENSE_FAILED");
1444                                 /* NOTREACHED */
1445                                 error = EIO;
1446                         } else if (ccb->ccb_h.retry_count == 0) {
1447                                 /*
1448                                  * XXX KDM shouldn't there be a better
1449                                  * argument to return??
1450                                  */
1451                                 error = EIO;
1452                         } else {
1453                                 /* decrement the number of retries */
1454                                 retry = ccb->ccb_h.retry_count > 0;
1455                                 if (retry)
1456                                         ccb->ccb_h.retry_count--;
1457                                 /*
1458                                  * If it was aborted with no
1459                                  * clue as to the reason, just
1460                                  * retry it again.
1461                                  */
1462                                 error = ERESTART;
1463                         }
1464                         break;
1465                 case SCSI_STATUS_QUEUE_FULL:
1466                 {
1467                         /* no decrement */
1468                         struct ccb_getdevstats cgds;
1469
1470                         /*
1471                          * First off, find out what the current
1472                          * transaction counts are.
1473                          */
1474                         xpt_setup_ccb(&cgds.ccb_h,
1475                                       ccb->ccb_h.path,
1476                                       /*priority*/1);
1477                         cgds.ccb_h.func_code = XPT_GDEV_STATS;
1478                         xpt_action((union ccb *)&cgds);
1479
1480                         /*
1481                          * If we were the only transaction active, treat
1482                          * the QUEUE FULL as if it were a BUSY condition.
1483                          */
1484                         if (cgds.dev_active != 0) {
1485                                 int total_openings;
1486
1487                                 /*
1488                                  * Reduce the number of openings to
1489                                  * be 1 less than the amount it took
1490                                  * to get a queue full bounded by the
1491                                  * minimum allowed tag count for this
1492                                  * device.
1493                                  */
1494                                 total_openings =
1495                                     cgds.dev_active+cgds.dev_openings;
1496                                 openings = cgds.dev_active;
1497                                 if (openings < cgds.mintags)
1498                                         openings = cgds.mintags;
1499                                 if (openings < total_openings)
1500                                         relsim_flags = RELSIM_ADJUST_OPENINGS;
1501                                 else {
1502                                         /*
1503                                          * Some devices report queue full for
1504                                          * temporary resource shortages.  For
1505                                          * this reason, we allow a minimum
1506                                          * tag count to be entered via a
1507                                          * quirk entry to prevent the queue
1508                                          * count on these devices from falling
1509                                          * to a pessimisticly low value.  We
1510                                          * still wait for the next successful
1511                                          * completion, however, before queueing
1512                                          * more transactions to the device.
1513                                          */
1514                                         relsim_flags =
1515                                             RELSIM_RELEASE_AFTER_CMDCMPLT;
1516                                 }
1517                                 timeout = 0;
1518                                 error = ERESTART;
1519                                 break;
1520                         }
1521                         /* FALLTHROUGH */
1522                 }
1523                 case SCSI_STATUS_BUSY:
1524                         /*
1525                          * Restart the queue after either another
1526                          * command completes or a 1 second timeout.
1527                          * If we have any retries left, that is.
1528                          */
1529                         retry = ccb->ccb_h.retry_count > 0;
1530                         if (retry) {
1531                                 ccb->ccb_h.retry_count--;
1532                                 error = ERESTART;
1533                                 relsim_flags = RELSIM_RELEASE_AFTER_TIMEOUT
1534                                              | RELSIM_RELEASE_AFTER_CMDCMPLT;
1535                                 timeout = 1000;
1536                         } else {
1537                                 error = EIO;
1538                         }
1539                         break;
1540                 case SCSI_STATUS_RESERV_CONFLICT:
1541                         error = EIO;
1542                         break;
1543                 default:
1544                         error = EIO;
1545                         break;
1546                 }
1547                 break;
1548         case CAM_REQ_CMP_ERR:
1549         case CAM_CMD_TIMEOUT:
1550         case CAM_UNEXP_BUSFREE:
1551         case CAM_UNCOR_PARITY:
1552         case CAM_DATA_RUN_ERR:
1553                 /* decrement the number of retries */
1554                 retry = ccb->ccb_h.retry_count > 0;
1555                 if (retry) {
1556                         ccb->ccb_h.retry_count--;
1557                         error = ERESTART;
1558                 } else {
1559                         error = EIO;
1560                 }
1561                 break;
1562         case CAM_UA_ABORT:
1563         case CAM_UA_TERMIO:
1564         case CAM_MSG_REJECT_REC:
1565                 /* XXX Don't know that these are correct */
1566                 error = EIO;
1567                 break;
1568         case CAM_SEL_TIMEOUT:
1569         {
1570                 /*
1571                  * XXX
1572                  * A single selection timeout should not be enough
1573                  * to invalidate a device.  We should retry for multiple
1574                  * seconds assuming this isn't a probe.  We'll probably
1575                  * need a special flag for that.
1576                  */
1577 #if 0
1578                 struct cam_path *newpath;
1579
1580                 /* Should we do more if we can't create the path?? */
1581                 if (xpt_create_path(&newpath, xpt_path_periph(ccb->ccb_h.path),
1582                                     xpt_path_path_id(ccb->ccb_h.path),
1583                                     xpt_path_target_id(ccb->ccb_h.path),
1584                                     CAM_LUN_WILDCARD) != CAM_REQ_CMP) 
1585                         break;
1586                 /*
1587                  * Let peripheral drivers know that this device has gone
1588                  * away.
1589                  */
1590                 xpt_async(AC_LOST_DEVICE, newpath, NULL);
1591                 xpt_free_path(newpath);
1592 #endif
1593                 if ((sense_flags & SF_RETRY_SELTO) != 0) {
1594                         retry = ccb->ccb_h.retry_count > 0;
1595                         if (retry) {
1596                                 ccb->ccb_h.retry_count--;
1597                                 error = ERESTART;
1598                                 /*
1599                                  * Wait half a second to give the device
1600                                  * time to recover before we try again.
1601                                  */
1602                                 relsim_flags = RELSIM_RELEASE_AFTER_TIMEOUT;
1603                                 timeout = 500;
1604                         } else {
1605                                 error = ENXIO;
1606                         }
1607                 } else {
1608                         error = ENXIO;
1609                 }
1610                 break;
1611         }
1612         case CAM_REQ_INVALID:
1613         case CAM_PATH_INVALID:
1614         case CAM_DEV_NOT_THERE:
1615         case CAM_NO_HBA:
1616         case CAM_PROVIDE_FAIL:
1617         case CAM_REQ_TOO_BIG:           
1618                 error = EINVAL;
1619                 break;
1620         case CAM_SCSI_BUS_RESET:
1621         case CAM_BDR_SENT:              
1622         case CAM_REQUEUE_REQ:
1623                 /* Unconditional requeue, dammit */
1624                 error = ERESTART;
1625                 break;
1626         case CAM_RESRC_UNAVAIL:
1627         case CAM_BUSY:
1628                 /* timeout??? */
1629         default:
1630                 /* decrement the number of retries */
1631                 retry = ccb->ccb_h.retry_count > 0;
1632                 if (retry) {
1633                         ccb->ccb_h.retry_count--;
1634                         error = ERESTART;
1635                 } else {
1636                         /* Check the sense codes */
1637                         error = EIO;
1638                 }
1639                 break;
1640         }
1641
1642         /* Attempt a retry */
1643         if (error == ERESTART || error == 0) {  
1644                 if (frozen != 0)
1645                         ccb->ccb_h.status &= ~CAM_DEV_QFRZN;
1646
1647                 if (error == ERESTART)
1648                         xpt_action(ccb);
1649                 
1650                 if (frozen != 0) {
1651                         cam_release_devq(ccb->ccb_h.path,
1652                                          relsim_flags,
1653                                          openings,
1654                                          timeout,
1655                                          /*getcount_only*/0);
1656                 }
1657         }
1658
1659
1660         return (error);
1661 }