initial commit
[freebsd-arm:freebsd-arm.git] / cam / scsi / scsi_xpt.c
1 /*-
2  * Implementation of the SCSI Transport
3  *
4  * Copyright (c) 1997, 1998, 1999 Justin T. Gibbs.
5  * Copyright (c) 1997, 1998, 1999 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
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
32
33 #include <sys/param.h>
34 #include <sys/bus.h>
35 #include <sys/systm.h>
36 #include <sys/types.h>
37 #include <sys/malloc.h>
38 #include <sys/kernel.h>
39 #include <sys/time.h>
40 #include <sys/conf.h>
41 #include <sys/fcntl.h>
42 #include <sys/md5.h>
43 #include <sys/interrupt.h>
44 #include <sys/sbuf.h>
45
46 #include <sys/lock.h>
47 #include <sys/mutex.h>
48 #include <sys/sysctl.h>
49
50 #ifdef PC98
51 #include <pc98/pc98/pc98_machdep.h>     /* geometry translation */
52 #endif
53
54 #include <cam/cam.h>
55 #include <cam/cam_ccb.h>
56 #include <cam/cam_queue.h>
57 #include <cam/cam_periph.h>
58 #include <cam/cam_sim.h>
59 #include <cam/cam_xpt.h>
60 #include <cam/cam_xpt_sim.h>
61 #include <cam/cam_xpt_periph.h>
62 #include <cam/cam_xpt_internal.h>
63 #include <cam/cam_debug.h>
64
65 #include <cam/scsi/scsi_all.h>
66 #include <cam/scsi/scsi_message.h>
67 #include <cam/scsi/scsi_pass.h>
68 #include <machine/stdarg.h>     /* for xpt_print below */
69 #include "opt_cam.h"
70
71 struct scsi_quirk_entry {
72         struct scsi_inquiry_pattern inq_pat;
73         u_int8_t quirks;
74 #define CAM_QUIRK_NOLUNS        0x01
75 #define CAM_QUIRK_NOSERIAL      0x02
76 #define CAM_QUIRK_HILUNS        0x04
77 #define CAM_QUIRK_NOHILUNS      0x08
78         u_int mintags;
79         u_int maxtags;
80 };
81 #define SCSI_QUIRK(dev) ((struct scsi_quirk_entry *)((dev)->quirk))
82
83 static int cam_srch_hi = 0;
84 TUNABLE_INT("kern.cam.cam_srch_hi", &cam_srch_hi);
85 static int sysctl_cam_search_luns(SYSCTL_HANDLER_ARGS);
86 SYSCTL_PROC(_kern_cam, OID_AUTO, cam_srch_hi, CTLTYPE_INT|CTLFLAG_RW, 0, 0,
87     sysctl_cam_search_luns, "I",
88     "allow search above LUN 7 for SCSI3 and greater devices");
89
90 #define CAM_SCSI2_MAXLUN        8
91 /*
92  * If we're not quirked to search <= the first 8 luns
93  * and we are either quirked to search above lun 8,
94  * or we're > SCSI-2 and we've enabled hilun searching,
95  * or we're > SCSI-2 and the last lun was a success,
96  * we can look for luns above lun 8.
97  */
98 #define CAN_SRCH_HI_SPARSE(dv)                                  \
99   (((SCSI_QUIRK(dv)->quirks & CAM_QUIRK_NOHILUNS) == 0)         \
100   && ((SCSI_QUIRK(dv)->quirks & CAM_QUIRK_HILUNS)               \
101   || (SID_ANSI_REV(&dv->inq_data) > SCSI_REV_2 && cam_srch_hi)))
102
103 #define CAN_SRCH_HI_DENSE(dv)                                   \
104   (((SCSI_QUIRK(dv)->quirks & CAM_QUIRK_NOHILUNS) == 0)         \
105   && ((SCSI_QUIRK(dv)->quirks & CAM_QUIRK_HILUNS)               \
106   || (SID_ANSI_REV(&dv->inq_data) > SCSI_REV_2)))
107
108 static periph_init_t probe_periph_init;
109
110 static struct periph_driver probe_driver =
111 {
112         probe_periph_init, "probe",
113         TAILQ_HEAD_INITIALIZER(probe_driver.units), /* generation */ 0,
114         CAM_PERIPH_DRV_EARLY
115 };
116
117 PERIPHDRIVER_DECLARE(probe, probe_driver);
118
119 typedef enum {
120         PROBE_TUR,
121         PROBE_INQUIRY,  /* this counts as DV0 for Basic Domain Validation */
122         PROBE_FULL_INQUIRY,
123         PROBE_MODE_SENSE,
124         PROBE_SERIAL_NUM_0,
125         PROBE_SERIAL_NUM_1,
126         PROBE_TUR_FOR_NEGOTIATION,
127         PROBE_INQUIRY_BASIC_DV1,
128         PROBE_INQUIRY_BASIC_DV2,
129         PROBE_DV_EXIT,
130         PROBE_INVALID
131 } probe_action;
132
133 static char *probe_action_text[] = {
134         "PROBE_TUR",
135         "PROBE_INQUIRY",
136         "PROBE_FULL_INQUIRY",
137         "PROBE_MODE_SENSE",
138         "PROBE_SERIAL_NUM_0",
139         "PROBE_SERIAL_NUM_1",
140         "PROBE_TUR_FOR_NEGOTIATION",
141         "PROBE_INQUIRY_BASIC_DV1",
142         "PROBE_INQUIRY_BASIC_DV2",
143         "PROBE_DV_EXIT",
144         "PROBE_INVALID"
145 };
146
147 #define PROBE_SET_ACTION(softc, newaction)      \
148 do {                                                                    \
149         char **text;                                                    \
150         text = probe_action_text;                                       \
151         CAM_DEBUG((softc)->periph->path, CAM_DEBUG_INFO,                \
152             ("Probe %s to %s\n", text[(softc)->action],                 \
153             text[(newaction)]));                                        \
154         (softc)->action = (newaction);                                  \
155 } while(0)
156
157 typedef enum {
158         PROBE_INQUIRY_CKSUM     = 0x01,
159         PROBE_SERIAL_CKSUM      = 0x02,
160         PROBE_NO_ANNOUNCE       = 0x04
161 } probe_flags;
162
163 typedef struct {
164         TAILQ_HEAD(, ccb_hdr) request_ccbs;
165         probe_action    action;
166         union ccb       saved_ccb;
167         probe_flags     flags;
168         MD5_CTX         context;
169         u_int8_t        digest[16];
170         struct cam_periph *periph;
171 } probe_softc;
172
173 static const char quantum[] = "QUANTUM";
174 static const char sony[] = "SONY";
175 static const char west_digital[] = "WDIGTL";
176 static const char samsung[] = "SAMSUNG";
177 static const char seagate[] = "SEAGATE";
178 static const char microp[] = "MICROP";
179
180 static struct scsi_quirk_entry scsi_quirk_table[] =
181 {
182         {
183                 /* Reports QUEUE FULL for temporary resource shortages */
184                 { T_DIRECT, SIP_MEDIA_FIXED, quantum, "XP39100*", "*" },
185                 /*quirks*/0, /*mintags*/24, /*maxtags*/32
186         },
187         {
188                 /* Reports QUEUE FULL for temporary resource shortages */
189                 { T_DIRECT, SIP_MEDIA_FIXED, quantum, "XP34550*", "*" },
190                 /*quirks*/0, /*mintags*/24, /*maxtags*/32
191         },
192         {
193                 /* Reports QUEUE FULL for temporary resource shortages */
194                 { T_DIRECT, SIP_MEDIA_FIXED, quantum, "XP32275*", "*" },
195                 /*quirks*/0, /*mintags*/24, /*maxtags*/32
196         },
197         {
198                 /* Broken tagged queuing drive */
199                 { T_DIRECT, SIP_MEDIA_FIXED, microp, "4421-07*", "*" },
200                 /*quirks*/0, /*mintags*/0, /*maxtags*/0
201         },
202         {
203                 /* Broken tagged queuing drive */
204                 { T_DIRECT, SIP_MEDIA_FIXED, "HP", "C372*", "*" },
205                 /*quirks*/0, /*mintags*/0, /*maxtags*/0
206         },
207         {
208                 /* Broken tagged queuing drive */
209                 { T_DIRECT, SIP_MEDIA_FIXED, microp, "3391*", "x43h" },
210                 /*quirks*/0, /*mintags*/0, /*maxtags*/0
211         },
212         {
213                 /*
214                  * Unfortunately, the Quantum Atlas III has the same
215                  * problem as the Atlas II drives above.
216                  * Reported by: "Johan Granlund" <johan@granlund.nu>
217                  *
218                  * For future reference, the drive with the problem was:
219                  * QUANTUM QM39100TD-SW N1B0
220                  *
221                  * It's possible that Quantum will fix the problem in later
222                  * firmware revisions.  If that happens, the quirk entry
223                  * will need to be made specific to the firmware revisions
224                  * with the problem.
225                  *
226                  */
227                 /* Reports QUEUE FULL for temporary resource shortages */
228                 { T_DIRECT, SIP_MEDIA_FIXED, quantum, "QM39100*", "*" },
229                 /*quirks*/0, /*mintags*/24, /*maxtags*/32
230         },
231         {
232                 /*
233                  * 18 Gig Atlas III, same problem as the 9G version.
234                  * Reported by: Andre Albsmeier
235                  *              <andre.albsmeier@mchp.siemens.de>
236                  *
237                  * For future reference, the drive with the problem was:
238                  * QUANTUM QM318000TD-S N491
239                  */
240                 /* Reports QUEUE FULL for temporary resource shortages */
241                 { T_DIRECT, SIP_MEDIA_FIXED, quantum, "QM318000*", "*" },
242                 /*quirks*/0, /*mintags*/24, /*maxtags*/32
243         },
244         {
245                 /*
246                  * Broken tagged queuing drive
247                  * Reported by: Bret Ford <bford@uop.cs.uop.edu>
248                  *         and: Martin Renters <martin@tdc.on.ca>
249                  */
250                 { T_DIRECT, SIP_MEDIA_FIXED, seagate, "ST410800*", "71*" },
251                 /*quirks*/0, /*mintags*/0, /*maxtags*/0
252         },
253                 /*
254                  * The Seagate Medalist Pro drives have very poor write
255                  * performance with anything more than 2 tags.
256                  *
257                  * Reported by:  Paul van der Zwan <paulz@trantor.xs4all.nl>
258                  * Drive:  <SEAGATE ST36530N 1444>
259                  *
260                  * Reported by:  Jeremy Lea <reg@shale.csir.co.za>
261                  * Drive:  <SEAGATE ST34520W 1281>
262                  *
263                  * No one has actually reported that the 9G version
264                  * (ST39140*) of the Medalist Pro has the same problem, but
265                  * we're assuming that it does because the 4G and 6.5G
266                  * versions of the drive are broken.
267                  */
268         {
269                 { T_DIRECT, SIP_MEDIA_FIXED, seagate, "ST34520*", "*"},
270                 /*quirks*/0, /*mintags*/2, /*maxtags*/2
271         },
272         {
273                 { T_DIRECT, SIP_MEDIA_FIXED, seagate, "ST36530*", "*"},
274                 /*quirks*/0, /*mintags*/2, /*maxtags*/2
275         },
276         {
277                 { T_DIRECT, SIP_MEDIA_FIXED, seagate, "ST39140*", "*"},
278                 /*quirks*/0, /*mintags*/2, /*maxtags*/2
279         },
280         {
281                 /*
282                  * Slow when tagged queueing is enabled.  Write performance
283                  * steadily drops off with more and more concurrent
284                  * transactions.  Best sequential write performance with
285                  * tagged queueing turned off and write caching turned on.
286                  *
287                  * PR:  kern/10398
288                  * Submitted by:  Hideaki Okada <hokada@isl.melco.co.jp>
289                  * Drive:  DCAS-34330 w/ "S65A" firmware.
290                  *
291                  * The drive with the problem had the "S65A" firmware
292                  * revision, and has also been reported (by Stephen J.
293                  * Roznowski <sjr@home.net>) for a drive with the "S61A"
294                  * firmware revision.
295                  *
296                  * Although no one has reported problems with the 2 gig
297                  * version of the DCAS drive, the assumption is that it
298                  * has the same problems as the 4 gig version.  Therefore
299                  * this quirk entries disables tagged queueing for all
300                  * DCAS drives.
301                  */
302                 { T_DIRECT, SIP_MEDIA_FIXED, "IBM", "DCAS*", "*" },
303                 /*quirks*/0, /*mintags*/0, /*maxtags*/0
304         },
305         {
306                 /* Broken tagged queuing drive */
307                 { T_DIRECT, SIP_MEDIA_REMOVABLE, "iomega", "jaz*", "*" },
308                 /*quirks*/0, /*mintags*/0, /*maxtags*/0
309         },
310         {
311                 /* Broken tagged queuing drive */
312                 { T_DIRECT, SIP_MEDIA_FIXED, "CONNER", "CFP2107*", "*" },
313                 /*quirks*/0, /*mintags*/0, /*maxtags*/0
314         },
315         {
316                 /* This does not support other than LUN 0 */
317                 { T_DIRECT, SIP_MEDIA_FIXED, "VMware*", "*", "*" },
318                 CAM_QUIRK_NOLUNS, /*mintags*/2, /*maxtags*/255
319         },
320         {
321                 /*
322                  * Broken tagged queuing drive.
323                  * Submitted by:
324                  * NAKAJI Hiroyuki <nakaji@zeisei.dpri.kyoto-u.ac.jp>
325                  * in PR kern/9535
326                  */
327                 { T_DIRECT, SIP_MEDIA_FIXED, samsung, "WN34324U*", "*" },
328                 /*quirks*/0, /*mintags*/0, /*maxtags*/0
329         },
330         {
331                 /*
332                  * Slow when tagged queueing is enabled. (1.5MB/sec versus
333                  * 8MB/sec.)
334                  * Submitted by: Andrew Gallatin <gallatin@cs.duke.edu>
335                  * Best performance with these drives is achieved with
336                  * tagged queueing turned off, and write caching turned on.
337                  */
338                 { T_DIRECT, SIP_MEDIA_FIXED, west_digital, "WDE*", "*" },
339                 /*quirks*/0, /*mintags*/0, /*maxtags*/0
340         },
341         {
342                 /*
343                  * Slow when tagged queueing is enabled. (1.5MB/sec versus
344                  * 8MB/sec.)
345                  * Submitted by: Andrew Gallatin <gallatin@cs.duke.edu>
346                  * Best performance with these drives is achieved with
347                  * tagged queueing turned off, and write caching turned on.
348                  */
349                 { T_DIRECT, SIP_MEDIA_FIXED, west_digital, "ENTERPRISE", "*" },
350                 /*quirks*/0, /*mintags*/0, /*maxtags*/0
351         },
352         {
353                 /*
354                  * Doesn't handle queue full condition correctly,
355                  * so we need to limit maxtags to what the device
356                  * can handle instead of determining this automatically.
357                  */
358                 { T_DIRECT, SIP_MEDIA_FIXED, samsung, "WN321010S*", "*" },
359                 /*quirks*/0, /*mintags*/2, /*maxtags*/32
360         },
361         {
362                 /* Really only one LUN */
363                 { T_ENCLOSURE, SIP_MEDIA_FIXED, "SUN", "SENA", "*" },
364                 CAM_QUIRK_NOLUNS, /*mintags*/0, /*maxtags*/0
365         },
366         {
367                 /* I can't believe we need a quirk for DPT volumes. */
368                 { T_ANY, SIP_MEDIA_FIXED|SIP_MEDIA_REMOVABLE, "DPT", "*", "*" },
369                 CAM_QUIRK_NOLUNS,
370                 /*mintags*/0, /*maxtags*/255
371         },
372         {
373                 /*
374                  * Many Sony CDROM drives don't like multi-LUN probing.
375                  */
376                 { T_CDROM, SIP_MEDIA_REMOVABLE, sony, "CD-ROM CDU*", "*" },
377                 CAM_QUIRK_NOLUNS, /*mintags*/0, /*maxtags*/0
378         },
379         {
380                 /*
381                  * This drive doesn't like multiple LUN probing.
382                  * Submitted by:  Parag Patel <parag@cgt.com>
383                  */
384                 { T_WORM, SIP_MEDIA_REMOVABLE, sony, "CD-R   CDU9*", "*" },
385                 CAM_QUIRK_NOLUNS, /*mintags*/0, /*maxtags*/0
386         },
387         {
388                 { T_WORM, SIP_MEDIA_REMOVABLE, "YAMAHA", "CDR100*", "*" },
389                 CAM_QUIRK_NOLUNS, /*mintags*/0, /*maxtags*/0
390         },
391         {
392                 /*
393                  * The 8200 doesn't like multi-lun probing, and probably
394                  * don't like serial number requests either.
395                  */
396                 {
397                         T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "EXABYTE",
398                         "EXB-8200*", "*"
399                 },
400                 CAM_QUIRK_NOLUNS, /*mintags*/0, /*maxtags*/0
401         },
402         {
403                 /*
404                  * Let's try the same as above, but for a drive that says
405                  * it's an IPL-6860 but is actually an EXB 8200.
406                  */
407                 {
408                         T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "EXABYTE",
409                         "IPL-6860*", "*"
410                 },
411                 CAM_QUIRK_NOLUNS, /*mintags*/0, /*maxtags*/0
412         },
413         {
414                 /*
415                  * These Hitachi drives don't like multi-lun probing.
416                  * The PR submitter has a DK319H, but says that the Linux
417                  * kernel has a similar work-around for the DK312 and DK314,
418                  * so all DK31* drives are quirked here.
419                  * PR:            misc/18793
420                  * Submitted by:  Paul Haddad <paul@pth.com>
421                  */
422                 { T_DIRECT, SIP_MEDIA_FIXED, "HITACHI", "DK31*", "*" },
423                 CAM_QUIRK_NOLUNS, /*mintags*/2, /*maxtags*/255
424         },
425         {
426                 /*
427                  * The Hitachi CJ series with J8A8 firmware apparantly has
428                  * problems with tagged commands.
429                  * PR: 23536
430                  * Reported by: amagai@nue.org
431                  */
432                 { T_DIRECT, SIP_MEDIA_FIXED, "HITACHI", "DK32CJ*", "J8A8" },
433                 CAM_QUIRK_NOLUNS, /*mintags*/0, /*maxtags*/0
434         },
435         {
436                 /*
437                  * These are the large storage arrays.
438                  * Submitted by:  William Carrel <william.carrel@infospace.com>
439                  */
440                 { T_DIRECT, SIP_MEDIA_FIXED, "HITACHI", "OPEN*", "*" },
441                 CAM_QUIRK_HILUNS, 2, 1024
442         },
443         {
444                 /*
445                  * This old revision of the TDC3600 is also SCSI-1, and
446                  * hangs upon serial number probing.
447                  */
448                 {
449                         T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "TANDBERG",
450                         " TDC 3600", "U07:"
451                 },
452                 CAM_QUIRK_NOSERIAL, /*mintags*/0, /*maxtags*/0
453         },
454         {
455                 /*
456                  * Would repond to all LUNs if asked for.
457                  */
458                 {
459                         T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "CALIPER",
460                         "CP150", "*"
461                 },
462                 CAM_QUIRK_NOLUNS, /*mintags*/0, /*maxtags*/0
463         },
464         {
465                 /*
466                  * Would repond to all LUNs if asked for.
467                  */
468                 {
469                         T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "KENNEDY",
470                         "96X2*", "*"
471                 },
472                 CAM_QUIRK_NOLUNS, /*mintags*/0, /*maxtags*/0
473         },
474         {
475                 /* Submitted by: Matthew Dodd <winter@jurai.net> */
476                 { T_PROCESSOR, SIP_MEDIA_FIXED, "Cabletrn", "EA41*", "*" },
477                 CAM_QUIRK_NOLUNS, /*mintags*/0, /*maxtags*/0
478         },
479         {
480                 /* Submitted by: Matthew Dodd <winter@jurai.net> */
481                 { T_PROCESSOR, SIP_MEDIA_FIXED, "CABLETRN", "EA41*", "*" },
482                 CAM_QUIRK_NOLUNS, /*mintags*/0, /*maxtags*/0
483         },
484         {
485                 /* TeraSolutions special settings for TRC-22 RAID */
486                 { T_DIRECT, SIP_MEDIA_FIXED, "TERASOLU", "TRC-22", "*" },
487                   /*quirks*/0, /*mintags*/55, /*maxtags*/255
488         },
489         {
490                 /* Veritas Storage Appliance */
491                 { T_DIRECT, SIP_MEDIA_FIXED, "VERITAS", "*", "*" },
492                   CAM_QUIRK_HILUNS, /*mintags*/2, /*maxtags*/1024
493         },
494         {
495                 /*
496                  * Would respond to all LUNs.  Device type and removable
497                  * flag are jumper-selectable.
498                  */
499                 { T_ANY, SIP_MEDIA_REMOVABLE|SIP_MEDIA_FIXED, "MaxOptix",
500                   "Tahiti 1", "*"
501                 },
502                 CAM_QUIRK_NOLUNS, /*mintags*/0, /*maxtags*/0
503         },
504         {
505                 /* EasyRAID E5A aka. areca ARC-6010 */
506                 { T_DIRECT, SIP_MEDIA_FIXED, "easyRAID", "*", "*" },
507                   CAM_QUIRK_NOHILUNS, /*mintags*/2, /*maxtags*/255
508         },
509         {
510                 { T_ENCLOSURE, SIP_MEDIA_FIXED, "DP", "BACKPLANE", "*" },
511                 CAM_QUIRK_NOLUNS, /*mintags*/0, /*maxtags*/0
512         },
513         {
514                 /* Default tagged queuing parameters for all devices */
515                 {
516                   T_ANY, SIP_MEDIA_REMOVABLE|SIP_MEDIA_FIXED,
517                   /*vendor*/"*", /*product*/"*", /*revision*/"*"
518                 },
519                 /*quirks*/0, /*mintags*/2, /*maxtags*/255
520         },
521 };
522
523 static const int scsi_quirk_table_size =
524         sizeof(scsi_quirk_table) / sizeof(*scsi_quirk_table);
525
526 static cam_status       proberegister(struct cam_periph *periph,
527                                       void *arg);
528 static void      probeschedule(struct cam_periph *probe_periph);
529 static void      probestart(struct cam_periph *periph, union ccb *start_ccb);
530 static void      proberequestdefaultnegotiation(struct cam_periph *periph);
531 static int       proberequestbackoff(struct cam_periph *periph,
532                                      struct cam_ed *device);
533 static void      probedone(struct cam_periph *periph, union ccb *done_ccb);
534 static void      probecleanup(struct cam_periph *periph);
535 static void      scsi_find_quirk(struct cam_ed *device);
536 static void      scsi_scan_bus(struct cam_periph *periph, union ccb *ccb);
537 static void      scsi_scan_lun(struct cam_periph *periph,
538                                struct cam_path *path, cam_flags flags,
539                                union ccb *ccb);
540 static void      xptscandone(struct cam_periph *periph, union ccb *done_ccb);
541 static struct cam_ed *
542                  scsi_alloc_device(struct cam_eb *bus, struct cam_et *target,
543                                    lun_id_t lun_id);
544 static void      scsi_devise_transport(struct cam_path *path);
545 static void      scsi_set_transfer_settings(struct ccb_trans_settings *cts,
546                                             struct cam_ed *device,
547                                             int async_update);
548 static void      scsi_toggle_tags(struct cam_path *path);
549 static void      scsi_dev_async(u_int32_t async_code,
550                                 struct cam_eb *bus,
551                                 struct cam_et *target,
552                                 struct cam_ed *device,
553                                 void *async_arg);
554 static void      scsi_action(union ccb *start_ccb);
555
556 static struct xpt_xport scsi_xport = {
557         .alloc_device = scsi_alloc_device,
558         .action = scsi_action,
559         .async = scsi_dev_async,
560 };
561
562 struct xpt_xport *
563 scsi_get_xport(void)
564 {
565         return (&scsi_xport);
566 }
567
568 static void
569 probe_periph_init()
570 {
571 }
572
573 static cam_status
574 proberegister(struct cam_periph *periph, void *arg)
575 {
576         union ccb *request_ccb; /* CCB representing the probe request */
577         cam_status status;
578         probe_softc *softc;
579
580         request_ccb = (union ccb *)arg;
581         if (periph == NULL) {
582                 printf("proberegister: periph was NULL!!\n");
583                 return(CAM_REQ_CMP_ERR);
584         }
585
586         if (request_ccb == NULL) {
587                 printf("proberegister: no probe CCB, "
588                        "can't register device\n");
589                 return(CAM_REQ_CMP_ERR);
590         }
591
592         softc = (probe_softc *)malloc(sizeof(*softc), M_CAMXPT, M_NOWAIT);
593
594         if (softc == NULL) {
595                 printf("proberegister: Unable to probe new device. "
596                        "Unable to allocate softc\n");
597                 return(CAM_REQ_CMP_ERR);
598         }
599         TAILQ_INIT(&softc->request_ccbs);
600         TAILQ_INSERT_TAIL(&softc->request_ccbs, &request_ccb->ccb_h,
601                           periph_links.tqe);
602         softc->flags = 0;
603         periph->softc = softc;
604         softc->periph = periph;
605         softc->action = PROBE_INVALID;
606         status = cam_periph_acquire(periph);
607         if (status != CAM_REQ_CMP) {
608                 return (status);
609         }
610
611
612         /*
613          * Ensure we've waited at least a bus settle
614          * delay before attempting to probe the device.
615          * For HBAs that don't do bus resets, this won't make a difference.
616          */
617         cam_periph_freeze_after_event(periph, &periph->path->bus->last_reset,
618                                       scsi_delay);
619         /*
620          * Ensure nobody slip in until probe finish.
621          */
622         cam_freeze_devq_arg(periph->path,
623             RELSIM_RELEASE_RUNLEVEL, CAM_RL_XPT + 1);
624         probeschedule(periph);
625         return(CAM_REQ_CMP);
626 }
627
628 static void
629 probeschedule(struct cam_periph *periph)
630 {
631         struct ccb_pathinq cpi;
632         union ccb *ccb;
633         probe_softc *softc;
634
635         softc = (probe_softc *)periph->softc;
636         ccb = (union ccb *)TAILQ_FIRST(&softc->request_ccbs);
637
638         xpt_setup_ccb(&cpi.ccb_h, periph->path, CAM_PRIORITY_NONE);
639         cpi.ccb_h.func_code = XPT_PATH_INQ;
640         xpt_action((union ccb *)&cpi);
641
642         /*
643          * If a device has gone away and another device, or the same one,
644          * is back in the same place, it should have a unit attention
645          * condition pending.  It will not report the unit attention in
646          * response to an inquiry, which may leave invalid transfer
647          * negotiations in effect.  The TUR will reveal the unit attention
648          * condition.  Only send the TUR for lun 0, since some devices
649          * will get confused by commands other than inquiry to non-existent
650          * luns.  If you think a device has gone away start your scan from
651          * lun 0.  This will insure that any bogus transfer settings are
652          * invalidated.
653          *
654          * If we haven't seen the device before and the controller supports
655          * some kind of transfer negotiation, negotiate with the first
656          * sent command if no bus reset was performed at startup.  This
657          * ensures that the device is not confused by transfer negotiation
658          * settings left over by loader or BIOS action.
659          */
660         if (((ccb->ccb_h.path->device->flags & CAM_DEV_UNCONFIGURED) == 0)
661          && (ccb->ccb_h.target_lun == 0)) {
662                 PROBE_SET_ACTION(softc, PROBE_TUR);
663         } else if ((cpi.hba_inquiry & (PI_WIDE_32|PI_WIDE_16|PI_SDTR_ABLE)) != 0
664               && (cpi.hba_misc & PIM_NOBUSRESET) != 0) {
665                 proberequestdefaultnegotiation(periph);
666                 PROBE_SET_ACTION(softc, PROBE_INQUIRY);
667         } else {
668                 PROBE_SET_ACTION(softc, PROBE_INQUIRY);
669         }
670
671         if (ccb->crcn.flags & CAM_EXPECT_INQ_CHANGE)
672                 softc->flags |= PROBE_NO_ANNOUNCE;
673         else
674                 softc->flags &= ~PROBE_NO_ANNOUNCE;
675
676         xpt_schedule(periph, CAM_PRIORITY_XPT);
677 }
678
679 static void
680 probestart(struct cam_periph *periph, union ccb *start_ccb)
681 {
682         /* Probe the device that our peripheral driver points to */
683         struct ccb_scsiio *csio;
684         probe_softc *softc;
685
686         CAM_DEBUG(start_ccb->ccb_h.path, CAM_DEBUG_TRACE, ("probestart\n"));
687
688         softc = (probe_softc *)periph->softc;
689         csio = &start_ccb->csio;
690
691         switch (softc->action) {
692         case PROBE_TUR:
693         case PROBE_TUR_FOR_NEGOTIATION:
694         case PROBE_DV_EXIT:
695         {
696                 scsi_test_unit_ready(csio,
697                                      /*retries*/10,
698                                      probedone,
699                                      MSG_SIMPLE_Q_TAG,
700                                      SSD_FULL_SIZE,
701                                      /*timeout*/60000);
702                 break;
703         }
704         case PROBE_INQUIRY:
705         case PROBE_FULL_INQUIRY:
706         case PROBE_INQUIRY_BASIC_DV1:
707         case PROBE_INQUIRY_BASIC_DV2:
708         {
709                 u_int inquiry_len;
710                 struct scsi_inquiry_data *inq_buf;
711
712                 inq_buf = &periph->path->device->inq_data;
713
714                 /*
715                  * If the device is currently configured, we calculate an
716                  * MD5 checksum of the inquiry data, and if the serial number
717                  * length is greater than 0, add the serial number data
718                  * into the checksum as well.  Once the inquiry and the
719                  * serial number check finish, we attempt to figure out
720                  * whether we still have the same device.
721                  */
722                 if ((periph->path->device->flags & CAM_DEV_UNCONFIGURED) == 0) {
723
724                         MD5Init(&softc->context);
725                         MD5Update(&softc->context, (unsigned char *)inq_buf,
726                                   sizeof(struct scsi_inquiry_data));
727                         softc->flags |= PROBE_INQUIRY_CKSUM;
728                         if (periph->path->device->serial_num_len > 0) {
729                                 MD5Update(&softc->context,
730                                           periph->path->device->serial_num,
731                                           periph->path->device->serial_num_len);
732                                 softc->flags |= PROBE_SERIAL_CKSUM;
733                         }
734                         MD5Final(softc->digest, &softc->context);
735                 }
736
737                 if (softc->action == PROBE_INQUIRY)
738                         inquiry_len = SHORT_INQUIRY_LENGTH;
739                 else
740                         inquiry_len = SID_ADDITIONAL_LENGTH(inq_buf);
741
742                 /*
743                  * Some parallel SCSI devices fail to send an
744                  * ignore wide residue message when dealing with
745                  * odd length inquiry requests.  Round up to be
746                  * safe.
747                  */
748                 inquiry_len = roundup2(inquiry_len, 2);
749
750                 if (softc->action == PROBE_INQUIRY_BASIC_DV1
751                  || softc->action == PROBE_INQUIRY_BASIC_DV2) {
752                         inq_buf = malloc(inquiry_len, M_CAMXPT, M_NOWAIT);
753                 }
754                 if (inq_buf == NULL) {
755                         xpt_print(periph->path, "malloc failure- skipping Basic"
756                             "Domain Validation\n");
757                         PROBE_SET_ACTION(softc, PROBE_DV_EXIT);
758                         scsi_test_unit_ready(csio,
759                                              /*retries*/4,
760                                              probedone,
761                                              MSG_SIMPLE_Q_TAG,
762                                              SSD_FULL_SIZE,
763                                              /*timeout*/60000);
764                         break;
765                 }
766                 scsi_inquiry(csio,
767                              /*retries*/4,
768                              probedone,
769                              MSG_SIMPLE_Q_TAG,
770                              (u_int8_t *)inq_buf,
771                              inquiry_len,
772                              /*evpd*/FALSE,
773                              /*page_code*/0,
774                              SSD_MIN_SIZE,
775                              /*timeout*/60 * 1000);
776                 break;
777         }
778         case PROBE_MODE_SENSE:
779         {
780                 void  *mode_buf;
781                 int    mode_buf_len;
782
783                 mode_buf_len = sizeof(struct scsi_mode_header_6)
784                              + sizeof(struct scsi_mode_blk_desc)
785                              + sizeof(struct scsi_control_page);
786                 mode_buf = malloc(mode_buf_len, M_CAMXPT, M_NOWAIT);
787                 if (mode_buf != NULL) {
788                         scsi_mode_sense(csio,
789                                         /*retries*/4,
790                                         probedone,
791                                         MSG_SIMPLE_Q_TAG,
792                                         /*dbd*/FALSE,
793                                         SMS_PAGE_CTRL_CURRENT,
794                                         SMS_CONTROL_MODE_PAGE,
795                                         mode_buf,
796                                         mode_buf_len,
797                                         SSD_FULL_SIZE,
798                                         /*timeout*/60000);
799                         break;
800                 }
801                 xpt_print(periph->path, "Unable to mode sense control page - "
802                     "malloc failure\n");
803                 PROBE_SET_ACTION(softc, PROBE_SERIAL_NUM_0);
804         }
805         /* FALLTHROUGH */
806         case PROBE_SERIAL_NUM_0:
807         {
808                 struct scsi_vpd_supported_page_list *vpd_list = NULL;
809                 struct cam_ed *device;
810
811                 device = periph->path->device;
812                 if ((SCSI_QUIRK(device)->quirks & CAM_QUIRK_NOSERIAL) == 0) {
813                         vpd_list = malloc(sizeof(*vpd_list), M_CAMXPT,
814                             M_NOWAIT | M_ZERO);
815                 }
816
817                 if (vpd_list != NULL) {
818                         scsi_inquiry(csio,
819                                      /*retries*/4,
820                                      probedone,
821                                      MSG_SIMPLE_Q_TAG,
822                                      (u_int8_t *)vpd_list,
823                                      sizeof(*vpd_list),
824                                      /*evpd*/TRUE,
825                                      SVPD_SUPPORTED_PAGE_LIST,
826                                      SSD_MIN_SIZE,
827                                      /*timeout*/60 * 1000);
828                         break;
829                 }
830                 /*
831                  * We'll have to do without, let our probedone
832                  * routine finish up for us.
833                  */
834                 start_ccb->csio.data_ptr = NULL;
835                 probedone(periph, start_ccb);
836                 return;
837         }
838         case PROBE_SERIAL_NUM_1:
839         {
840                 struct scsi_vpd_unit_serial_number *serial_buf;
841                 struct cam_ed* device;
842
843                 serial_buf = NULL;
844                 device = periph->path->device;
845                 if (device->serial_num != NULL) {
846                         free(device->serial_num, M_CAMXPT);
847                         device->serial_num = NULL;
848                         device->serial_num_len = 0;
849                 }
850
851                 serial_buf = (struct scsi_vpd_unit_serial_number *)
852                         malloc(sizeof(*serial_buf), M_CAMXPT, M_NOWAIT|M_ZERO);
853
854                 if (serial_buf != NULL) {
855                         scsi_inquiry(csio,
856                                      /*retries*/4,
857                                      probedone,
858                                      MSG_SIMPLE_Q_TAG,
859                                      (u_int8_t *)serial_buf,
860                                      sizeof(*serial_buf),
861                                      /*evpd*/TRUE,
862                                      SVPD_UNIT_SERIAL_NUMBER,
863                                      SSD_MIN_SIZE,
864                                      /*timeout*/60 * 1000);
865                         break;
866                 }
867                 /*
868                  * We'll have to do without, let our probedone
869                  * routine finish up for us.
870                  */
871                 start_ccb->csio.data_ptr = NULL;
872                 probedone(periph, start_ccb);
873                 return;
874         }
875         case PROBE_INVALID:
876                 CAM_DEBUG(start_ccb->ccb_h.path, CAM_DEBUG_INFO,
877                     ("probestart: invalid action state\n"));
878         default:
879                 break;
880         }
881         xpt_action(start_ccb);
882 }
883
884 static void
885 proberequestdefaultnegotiation(struct cam_periph *periph)
886 {
887         struct ccb_trans_settings cts;
888
889         xpt_setup_ccb(&cts.ccb_h, periph->path, CAM_PRIORITY_NONE);
890         cts.ccb_h.func_code = XPT_GET_TRAN_SETTINGS;
891         cts.type = CTS_TYPE_USER_SETTINGS;
892         xpt_action((union ccb *)&cts);
893         if ((cts.ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_CMP) {
894                 return;
895         }
896         cts.ccb_h.func_code = XPT_SET_TRAN_SETTINGS;
897         cts.type = CTS_TYPE_CURRENT_SETTINGS;
898         xpt_action((union ccb *)&cts);
899 }
900
901 /*
902  * Backoff Negotiation Code- only pertinent for SPI devices.
903  */
904 static int
905 proberequestbackoff(struct cam_periph *periph, struct cam_ed *device)
906 {
907         struct ccb_trans_settings cts;
908         struct ccb_trans_settings_spi *spi;
909
910         memset(&cts, 0, sizeof (cts));
911         xpt_setup_ccb(&cts.ccb_h, periph->path, CAM_PRIORITY_NONE);
912         cts.ccb_h.func_code = XPT_GET_TRAN_SETTINGS;
913         cts.type = CTS_TYPE_CURRENT_SETTINGS;
914         xpt_action((union ccb *)&cts);
915         if ((cts.ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_CMP) {
916                 if (bootverbose) {
917                         xpt_print(periph->path,
918                             "failed to get current device settings\n");
919                 }
920                 return (0);
921         }
922         if (cts.transport != XPORT_SPI) {
923                 if (bootverbose) {
924                         xpt_print(periph->path, "not SPI transport\n");
925                 }
926                 return (0);
927         }
928         spi = &cts.xport_specific.spi;
929
930         /*
931          * We cannot renegotiate sync rate if we don't have one.
932          */
933         if ((spi->valid & CTS_SPI_VALID_SYNC_RATE) == 0) {
934                 if (bootverbose) {
935                         xpt_print(periph->path, "no sync rate known\n");
936                 }
937                 return (0);
938         }
939
940         /*
941          * We'll assert that we don't have to touch PPR options- the
942          * SIM will see what we do with period and offset and adjust
943          * the PPR options as appropriate.
944          */
945
946         /*
947          * A sync rate with unknown or zero offset is nonsensical.
948          * A sync period of zero means Async.
949          */
950         if ((spi->valid & CTS_SPI_VALID_SYNC_OFFSET) == 0
951          || spi->sync_offset == 0 || spi->sync_period == 0) {
952                 if (bootverbose) {
953                         xpt_print(periph->path, "no sync rate available\n");
954                 }
955                 return (0);
956         }
957
958         if (device->flags & CAM_DEV_DV_HIT_BOTTOM) {
959                 CAM_DEBUG(periph->path, CAM_DEBUG_INFO,
960                     ("hit async: giving up on DV\n"));
961                 return (0);
962         }
963
964
965         /*
966          * Jump sync_period up by one, but stop at 5MHz and fall back to Async.
967          * We don't try to remember 'last' settings to see if the SIM actually
968          * gets into the speed we want to set. We check on the SIM telling
969          * us that a requested speed is bad, but otherwise don't try and
970          * check the speed due to the asynchronous and handshake nature
971          * of speed setting.
972          */
973         spi->valid = CTS_SPI_VALID_SYNC_RATE | CTS_SPI_VALID_SYNC_OFFSET;
974         for (;;) {
975                 spi->sync_period++;
976                 if (spi->sync_period >= 0xf) {
977                         spi->sync_period = 0;
978                         spi->sync_offset = 0;
979                         CAM_DEBUG(periph->path, CAM_DEBUG_INFO,
980                             ("setting to async for DV\n"));
981                         /*
982                          * Once we hit async, we don't want to try
983                          * any more settings.
984                          */
985                         device->flags |= CAM_DEV_DV_HIT_BOTTOM;
986                 } else if (bootverbose) {
987                         CAM_DEBUG(periph->path, CAM_DEBUG_INFO,
988                             ("DV: period 0x%x\n", spi->sync_period));
989                         printf("setting period to 0x%x\n", spi->sync_period);
990                 }
991                 cts.ccb_h.func_code = XPT_SET_TRAN_SETTINGS;
992                 cts.type = CTS_TYPE_CURRENT_SETTINGS;
993                 xpt_action((union ccb *)&cts);
994                 if ((cts.ccb_h.status & CAM_STATUS_MASK) == CAM_REQ_CMP) {
995                         break;
996                 }
997                 CAM_DEBUG(periph->path, CAM_DEBUG_INFO,
998                     ("DV: failed to set period 0x%x\n", spi->sync_period));
999                 if (spi->sync_period == 0) {
1000                         return (0);
1001                 }
1002         }
1003         return (1);
1004 }
1005
1006 static void
1007 probedone(struct cam_periph *periph, union ccb *done_ccb)
1008 {
1009         probe_softc *softc;
1010         struct cam_path *path;
1011         u_int32_t  priority;
1012
1013         CAM_DEBUG(done_ccb->ccb_h.path, CAM_DEBUG_TRACE, ("probedone\n"));
1014
1015         softc = (probe_softc *)periph->softc;
1016         path = done_ccb->ccb_h.path;
1017         priority = done_ccb->ccb_h.pinfo.priority;
1018
1019         switch (softc->action) {
1020         case PROBE_TUR:
1021         {
1022                 if ((done_ccb->ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_CMP) {
1023
1024                         if (cam_periph_error(done_ccb, 0,
1025                                              SF_NO_PRINT, NULL) == ERESTART)
1026                                 return;
1027                         else if ((done_ccb->ccb_h.status & CAM_DEV_QFRZN) != 0)
1028                                 /* Don't wedge the queue */
1029                                 xpt_release_devq(done_ccb->ccb_h.path,
1030                                                  /*count*/1,
1031                                                  /*run_queue*/TRUE);
1032                 }
1033                 PROBE_SET_ACTION(softc, PROBE_INQUIRY);
1034                 xpt_release_ccb(done_ccb);
1035                 xpt_schedule(periph, priority);
1036                 return;
1037         }
1038         case PROBE_INQUIRY:
1039         case PROBE_FULL_INQUIRY:
1040         {
1041                 if ((done_ccb->ccb_h.status & CAM_STATUS_MASK) == CAM_REQ_CMP) {
1042                         struct scsi_inquiry_data *inq_buf;
1043                         u_int8_t periph_qual;
1044
1045                         path->device->flags |= CAM_DEV_INQUIRY_DATA_VALID;
1046                         inq_buf = &path->device->inq_data;
1047
1048                         periph_qual = SID_QUAL(inq_buf);
1049
1050                         switch(periph_qual) {
1051                         case SID_QUAL_LU_CONNECTED:
1052                         {
1053                                 u_int8_t len;
1054
1055                                 /*
1056                                  * We conservatively request only
1057                                  * SHORT_INQUIRY_LEN bytes of inquiry
1058                                  * information during our first try
1059                                  * at sending an INQUIRY. If the device
1060                                  * has more information to give,
1061                                  * perform a second request specifying
1062                                  * the amount of information the device
1063                                  * is willing to give.
1064                                  */
1065                                 len = inq_buf->additional_length
1066                                     + offsetof(struct scsi_inquiry_data,
1067                                                additional_length) + 1;
1068                                 if (softc->action == PROBE_INQUIRY
1069                                     && len > SHORT_INQUIRY_LENGTH) {
1070                                         PROBE_SET_ACTION(softc, PROBE_FULL_INQUIRY);
1071                                         xpt_release_ccb(done_ccb);
1072                                         xpt_schedule(periph, priority);
1073                                         return;
1074                                 }
1075
1076                                 scsi_find_quirk(path->device);
1077
1078                                 scsi_devise_transport(path);
1079                                 if (INQ_DATA_TQ_ENABLED(inq_buf))
1080                                         PROBE_SET_ACTION(softc, PROBE_MODE_SENSE);
1081                                 else
1082                                         PROBE_SET_ACTION(softc, PROBE_SERIAL_NUM_0);
1083
1084                                 if (path->device->flags & CAM_DEV_UNCONFIGURED) {
1085                                         path->device->flags &= ~CAM_DEV_UNCONFIGURED;
1086                                         xpt_acquire_device(path->device);
1087                                 }
1088                                 xpt_release_ccb(done_ccb);
1089                                 xpt_schedule(periph, priority);
1090                                 return;
1091                         }
1092                         default:
1093                                 break;
1094                         }
1095                 } else if (cam_periph_error(done_ccb, 0,
1096                                             done_ccb->ccb_h.target_lun > 0
1097                                             ? SF_RETRY_UA|SF_QUIET_IR
1098                                             : SF_RETRY_UA,
1099                                             &softc->saved_ccb) == ERESTART) {
1100                         return;
1101                 } else if ((done_ccb->ccb_h.status & CAM_DEV_QFRZN) != 0) {
1102                         /* Don't wedge the queue */
1103                         xpt_release_devq(done_ccb->ccb_h.path, /*count*/1,
1104                                          /*run_queue*/TRUE);
1105                 }
1106                 /*
1107                  * If we get to this point, we got an error status back
1108                  * from the inquiry and the error status doesn't require
1109                  * automatically retrying the command.  Therefore, the
1110                  * inquiry failed.  If we had inquiry information before
1111                  * for this device, but this latest inquiry command failed,
1112                  * the device has probably gone away.  If this device isn't
1113                  * already marked unconfigured, notify the peripheral
1114                  * drivers that this device is no more.
1115                  */
1116                 if ((path->device->flags & CAM_DEV_UNCONFIGURED) == 0)
1117                         /* Send the async notification. */
1118                         xpt_async(AC_LOST_DEVICE, path, NULL);
1119
1120                 xpt_release_ccb(done_ccb);
1121                 break;
1122         }
1123         case PROBE_MODE_SENSE:
1124         {
1125                 struct ccb_scsiio *csio;
1126                 struct scsi_mode_header_6 *mode_hdr;
1127
1128                 csio = &done_ccb->csio;
1129                 mode_hdr = (struct scsi_mode_header_6 *)csio->data_ptr;
1130                 if ((csio->ccb_h.status & CAM_STATUS_MASK) == CAM_REQ_CMP) {
1131                         struct scsi_control_page *page;
1132                         u_int8_t *offset;
1133
1134                         offset = ((u_int8_t *)&mode_hdr[1])
1135                             + mode_hdr->blk_desc_len;
1136                         page = (struct scsi_control_page *)offset;
1137                         path->device->queue_flags = page->queue_flags;
1138                 } else if (cam_periph_error(done_ccb, 0,
1139                                             SF_RETRY_UA|SF_NO_PRINT,
1140                                             &softc->saved_ccb) == ERESTART) {
1141                         return;
1142                 } else if ((done_ccb->ccb_h.status & CAM_DEV_QFRZN) != 0) {
1143                         /* Don't wedge the queue */
1144                         xpt_release_devq(done_ccb->ccb_h.path,
1145                                          /*count*/1, /*run_queue*/TRUE);
1146                 }
1147                 xpt_release_ccb(done_ccb);
1148                 free(mode_hdr, M_CAMXPT);
1149                 PROBE_SET_ACTION(softc, PROBE_SERIAL_NUM_0);
1150                 xpt_schedule(periph, priority);
1151                 return;
1152         }
1153         case PROBE_SERIAL_NUM_0:
1154         {
1155                 struct ccb_scsiio *csio;
1156                 struct scsi_vpd_supported_page_list *page_list;
1157                 int length, serialnum_supported, i;
1158
1159                 serialnum_supported = 0;
1160                 csio = &done_ccb->csio;
1161                 page_list =
1162                     (struct scsi_vpd_supported_page_list *)csio->data_ptr;
1163
1164                 if (page_list == NULL) {
1165                         /*
1166                          * Don't process the command as it was never sent
1167                          */
1168                 } else if ((csio->ccb_h.status & CAM_STATUS_MASK) == CAM_REQ_CMP
1169                     && (page_list->length > 0)) {
1170                         length = min(page_list->length,
1171                             SVPD_SUPPORTED_PAGES_SIZE);
1172                         for (i = 0; i < length; i++) {
1173                                 if (page_list->list[i] ==
1174                                     SVPD_UNIT_SERIAL_NUMBER) {
1175                                         serialnum_supported = 1;
1176                                         break;
1177                                 }
1178                         }
1179                 } else if (cam_periph_error(done_ccb, 0,
1180                                             SF_RETRY_UA|SF_NO_PRINT,
1181                                             &softc->saved_ccb) == ERESTART) {
1182                         return;
1183                 } else if ((done_ccb->ccb_h.status & CAM_DEV_QFRZN) != 0) {
1184                         /* Don't wedge the queue */
1185                         xpt_release_devq(done_ccb->ccb_h.path, /*count*/1,
1186                                          /*run_queue*/TRUE);
1187                 }
1188
1189                 if (page_list != NULL)
1190                         free(page_list, M_CAMXPT);
1191
1192                 if (serialnum_supported) {
1193                         xpt_release_ccb(done_ccb);
1194                         PROBE_SET_ACTION(softc, PROBE_SERIAL_NUM_1);
1195                         xpt_schedule(periph, priority);
1196                         return;
1197                 }
1198
1199                 csio->data_ptr = NULL;
1200                 /* FALLTHROUGH */
1201         }
1202
1203         case PROBE_SERIAL_NUM_1:
1204         {
1205                 struct ccb_scsiio *csio;
1206                 struct scsi_vpd_unit_serial_number *serial_buf;
1207                 u_int32_t  priority;
1208                 int changed;
1209                 int have_serialnum;
1210
1211                 changed = 1;
1212                 have_serialnum = 0;
1213                 csio = &done_ccb->csio;
1214                 priority = done_ccb->ccb_h.pinfo.priority;
1215                 serial_buf =
1216                     (struct scsi_vpd_unit_serial_number *)csio->data_ptr;
1217
1218                 /* Clean up from previous instance of this device */
1219                 if (path->device->serial_num != NULL) {
1220                         free(path->device->serial_num, M_CAMXPT);
1221                         path->device->serial_num = NULL;
1222                         path->device->serial_num_len = 0;
1223                 }
1224
1225                 if (serial_buf == NULL) {
1226                         /*
1227                          * Don't process the command as it was never sent
1228                          */
1229                 } else if ((csio->ccb_h.status & CAM_STATUS_MASK) == CAM_REQ_CMP
1230                         && (serial_buf->length > 0)) {
1231
1232                         have_serialnum = 1;
1233                         path->device->serial_num =
1234                                 (u_int8_t *)malloc((serial_buf->length + 1),
1235                                                    M_CAMXPT, M_NOWAIT);
1236                         if (path->device->serial_num != NULL) {
1237                                 bcopy(serial_buf->serial_num,
1238                                       path->device->serial_num,
1239                                       serial_buf->length);
1240                                 path->device->serial_num_len =
1241                                     serial_buf->length;
1242                                 path->device->serial_num[serial_buf->length]
1243                                     = '\0';
1244                         }
1245                 } else if (cam_periph_error(done_ccb, 0,
1246                                             SF_RETRY_UA|SF_NO_PRINT,
1247                                             &softc->saved_ccb) == ERESTART) {
1248                         return;
1249                 } else if ((done_ccb->ccb_h.status & CAM_DEV_QFRZN) != 0) {
1250                         /* Don't wedge the queue */
1251                         xpt_release_devq(done_ccb->ccb_h.path, /*count*/1,
1252                                          /*run_queue*/TRUE);
1253                 }
1254
1255                 /*
1256                  * Let's see if we have seen this device before.
1257                  */
1258                 if ((softc->flags & PROBE_INQUIRY_CKSUM) != 0) {
1259                         MD5_CTX context;
1260                         u_int8_t digest[16];
1261
1262                         MD5Init(&context);
1263
1264                         MD5Update(&context,
1265                                   (unsigned char *)&path->device->inq_data,
1266                                   sizeof(struct scsi_inquiry_data));
1267
1268                         if (have_serialnum)
1269                                 MD5Update(&context, serial_buf->serial_num,
1270                                           serial_buf->length);
1271
1272                         MD5Final(digest, &context);
1273                         if (bcmp(softc->digest, digest, 16) == 0)
1274                                 changed = 0;
1275
1276                         /*
1277                          * XXX Do we need to do a TUR in order to ensure
1278                          *     that the device really hasn't changed???
1279                          */
1280                         if ((changed != 0)
1281                          && ((softc->flags & PROBE_NO_ANNOUNCE) == 0))
1282                                 xpt_async(AC_LOST_DEVICE, path, NULL);
1283                 }
1284                 if (serial_buf != NULL)
1285                         free(serial_buf, M_CAMXPT);
1286
1287                 if (changed != 0) {
1288                         /*
1289                          * Now that we have all the necessary
1290                          * information to safely perform transfer
1291                          * negotiations... Controllers don't perform
1292                          * any negotiation or tagged queuing until
1293                          * after the first XPT_SET_TRAN_SETTINGS ccb is
1294                          * received.  So, on a new device, just retrieve
1295                          * the user settings, and set them as the current
1296                          * settings to set the device up.
1297                          */
1298                         proberequestdefaultnegotiation(periph);
1299                         xpt_release_ccb(done_ccb);
1300
1301                         /*
1302                          * Perform a TUR to allow the controller to
1303                          * perform any necessary transfer negotiation.
1304                          */
1305                         PROBE_SET_ACTION(softc, PROBE_TUR_FOR_NEGOTIATION);
1306                         xpt_schedule(periph, priority);
1307                         return;
1308                 }
1309                 xpt_release_ccb(done_ccb);
1310                 break;
1311         }
1312         case PROBE_TUR_FOR_NEGOTIATION:
1313                 if ((done_ccb->ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_CMP) {
1314                         DELAY(500000);
1315                         if (cam_periph_error(done_ccb, 0, SF_RETRY_UA,
1316                             NULL) == ERESTART)
1317                                 return;
1318                 }
1319         /* FALLTHROUGH */
1320         case PROBE_DV_EXIT:
1321                 if ((done_ccb->ccb_h.status & CAM_DEV_QFRZN) != 0) {
1322                         /* Don't wedge the queue */
1323                         xpt_release_devq(done_ccb->ccb_h.path, /*count*/1,
1324                                          /*run_queue*/TRUE);
1325                 }
1326                 /*
1327                  * Do Domain Validation for lun 0 on devices that claim
1328                  * to support Synchronous Transfer modes.
1329                  */
1330                 if (softc->action == PROBE_TUR_FOR_NEGOTIATION
1331                  && done_ccb->ccb_h.target_lun == 0
1332                  && (path->device->inq_data.flags & SID_Sync) != 0
1333                  && (path->device->flags & CAM_DEV_IN_DV) == 0) {
1334                         CAM_DEBUG(periph->path, CAM_DEBUG_INFO,
1335                             ("Begin Domain Validation\n"));
1336                         path->device->flags |= CAM_DEV_IN_DV;
1337                         xpt_release_ccb(done_ccb);
1338                         PROBE_SET_ACTION(softc, PROBE_INQUIRY_BASIC_DV1);
1339                         xpt_schedule(periph, priority);
1340                         return;
1341                 }
1342                 if (softc->action == PROBE_DV_EXIT) {
1343                         CAM_DEBUG(periph->path, CAM_DEBUG_INFO,
1344                             ("Leave Domain Validation\n"));
1345                 }
1346                 if (path->device->flags & CAM_DEV_UNCONFIGURED) {
1347                         path->device->flags &= ~CAM_DEV_UNCONFIGURED;
1348                         xpt_acquire_device(path->device);
1349                 }
1350                 path->device->flags &=
1351                     ~(CAM_DEV_IN_DV|CAM_DEV_DV_HIT_BOTTOM);
1352                 if ((softc->flags & PROBE_NO_ANNOUNCE) == 0) {
1353                         /* Inform the XPT that a new device has been found */
1354                         done_ccb->ccb_h.func_code = XPT_GDEV_TYPE;
1355                         xpt_action(done_ccb);
1356                         xpt_async(AC_FOUND_DEVICE, done_ccb->ccb_h.path,
1357                                   done_ccb);
1358                 }
1359                 xpt_release_ccb(done_ccb);
1360                 break;
1361         case PROBE_INQUIRY_BASIC_DV1:
1362         case PROBE_INQUIRY_BASIC_DV2:
1363         {
1364                 struct scsi_inquiry_data *nbuf;
1365                 struct ccb_scsiio *csio;
1366
1367                 if ((done_ccb->ccb_h.status & CAM_DEV_QFRZN) != 0) {
1368                         /* Don't wedge the queue */
1369                         xpt_release_devq(done_ccb->ccb_h.path, /*count*/1,
1370                                          /*run_queue*/TRUE);
1371                 }
1372                 csio = &done_ccb->csio;
1373                 nbuf = (struct scsi_inquiry_data *)csio->data_ptr;
1374                 if (bcmp(nbuf, &path->device->inq_data, SHORT_INQUIRY_LENGTH)) {
1375                         xpt_print(path,
1376                             "inquiry data fails comparison at DV%d step\n",
1377                             softc->action == PROBE_INQUIRY_BASIC_DV1 ? 1 : 2);
1378                         if (proberequestbackoff(periph, path->device)) {
1379                                 path->device->flags &= ~CAM_DEV_IN_DV;
1380                                 PROBE_SET_ACTION(softc, PROBE_TUR_FOR_NEGOTIATION);
1381                         } else {
1382                                 /* give up */
1383                                 PROBE_SET_ACTION(softc, PROBE_DV_EXIT);
1384                         }
1385                         free(nbuf, M_CAMXPT);
1386                         xpt_release_ccb(done_ccb);
1387                         xpt_schedule(periph, priority);
1388                         return;
1389                 }
1390                 free(nbuf, M_CAMXPT);
1391                 if (softc->action == PROBE_INQUIRY_BASIC_DV1) {
1392                         PROBE_SET_ACTION(softc, PROBE_INQUIRY_BASIC_DV2);
1393                         xpt_release_ccb(done_ccb);
1394                         xpt_schedule(periph, priority);
1395                         return;
1396                 }
1397                 if (softc->action == PROBE_INQUIRY_BASIC_DV2) {
1398                         CAM_DEBUG(periph->path, CAM_DEBUG_INFO,
1399                             ("Leave Domain Validation Successfully\n"));
1400                 }
1401                 if (path->device->flags & CAM_DEV_UNCONFIGURED) {
1402                         path->device->flags &= ~CAM_DEV_UNCONFIGURED;
1403                         xpt_acquire_device(path->device);
1404                 }
1405                 path->device->flags &=
1406                     ~(CAM_DEV_IN_DV|CAM_DEV_DV_HIT_BOTTOM);
1407                 if ((softc->flags & PROBE_NO_ANNOUNCE) == 0) {
1408                         /* Inform the XPT that a new device has been found */
1409                         done_ccb->ccb_h.func_code = XPT_GDEV_TYPE;
1410                         xpt_action(done_ccb);
1411                         xpt_async(AC_FOUND_DEVICE, done_ccb->ccb_h.path,
1412                                   done_ccb);
1413                 }
1414                 xpt_release_ccb(done_ccb);
1415                 break;
1416         }
1417         case PROBE_INVALID:
1418                 CAM_DEBUG(done_ccb->ccb_h.path, CAM_DEBUG_INFO,
1419                     ("probedone: invalid action state\n"));
1420         default:
1421                 break;
1422         }
1423         done_ccb = (union ccb *)TAILQ_FIRST(&softc->request_ccbs);
1424         TAILQ_REMOVE(&softc->request_ccbs, &done_ccb->ccb_h, periph_links.tqe);
1425         done_ccb->ccb_h.status = CAM_REQ_CMP;
1426         xpt_done(done_ccb);
1427         if (TAILQ_FIRST(&softc->request_ccbs) == NULL) {
1428                 cam_release_devq(periph->path,
1429                     RELSIM_RELEASE_RUNLEVEL, 0, CAM_RL_XPT + 1, FALSE);
1430                 cam_periph_invalidate(periph);
1431                 cam_periph_release_locked(periph);
1432         } else {
1433                 probeschedule(periph);
1434         }
1435 }
1436
1437 static void
1438 probecleanup(struct cam_periph *periph)
1439 {
1440         free(periph->softc, M_CAMXPT);
1441 }
1442
1443 static void
1444 scsi_find_quirk(struct cam_ed *device)
1445 {
1446         struct scsi_quirk_entry *quirk;
1447         caddr_t match;
1448
1449         match = cam_quirkmatch((caddr_t)&device->inq_data,
1450                                (caddr_t)scsi_quirk_table,
1451                                sizeof(scsi_quirk_table) /
1452                                sizeof(*scsi_quirk_table),
1453                                sizeof(*scsi_quirk_table), scsi_inquiry_match);
1454
1455         if (match == NULL)
1456                 panic("xpt_find_quirk: device didn't match wildcard entry!!");
1457
1458         quirk = (struct scsi_quirk_entry *)match;
1459         device->quirk = quirk;
1460         device->mintags = quirk->mintags;
1461         device->maxtags = quirk->maxtags;
1462 }
1463
1464 static int
1465 sysctl_cam_search_luns(SYSCTL_HANDLER_ARGS)
1466 {
1467         int error, bool;
1468
1469         bool = cam_srch_hi;
1470         error = sysctl_handle_int(oidp, &bool, 0, req);
1471         if (error != 0 || req->newptr == NULL)
1472                 return (error);
1473         if (bool == 0 || bool == 1) {
1474                 cam_srch_hi = bool;
1475                 return (0);
1476         } else {
1477                 return (EINVAL);
1478         }
1479 }
1480
1481 typedef struct {
1482         union   ccb *request_ccb;
1483         struct  ccb_pathinq *cpi;
1484         int     counter;
1485 } scsi_scan_bus_info;
1486
1487 /*
1488  * To start a scan, request_ccb is an XPT_SCAN_BUS ccb.
1489  * As the scan progresses, scsi_scan_bus is used as the
1490  * callback on completion function.
1491  */
1492 static void
1493 scsi_scan_bus(struct cam_periph *periph, union ccb *request_ccb)
1494 {
1495         CAM_DEBUG(request_ccb->ccb_h.path, CAM_DEBUG_TRACE,
1496                   ("scsi_scan_bus\n"));
1497         switch (request_ccb->ccb_h.func_code) {
1498         case XPT_SCAN_BUS:
1499         {
1500                 scsi_scan_bus_info *scan_info;
1501                 union   ccb *work_ccb, *reset_ccb;
1502                 struct  cam_path *path;
1503                 u_int   i;
1504                 u_int   max_target;
1505                 u_int   initiator_id;
1506
1507                 /* Find out the characteristics of the bus */
1508                 work_ccb = xpt_alloc_ccb_nowait();
1509                 if (work_ccb == NULL) {
1510                         request_ccb->ccb_h.status = CAM_RESRC_UNAVAIL;
1511                         xpt_done(request_ccb);
1512                         return;
1513                 }
1514                 xpt_setup_ccb(&work_ccb->ccb_h, request_ccb->ccb_h.path,
1515                               request_ccb->ccb_h.pinfo.priority);
1516                 work_ccb->ccb_h.func_code = XPT_PATH_INQ;
1517                 xpt_action(work_ccb);
1518                 if (work_ccb->ccb_h.status != CAM_REQ_CMP) {
1519                         request_ccb->ccb_h.status = work_ccb->ccb_h.status;
1520                         xpt_free_ccb(work_ccb);
1521                         xpt_done(request_ccb);
1522                         return;
1523                 }
1524
1525                 if ((work_ccb->cpi.hba_misc & PIM_NOINITIATOR) != 0) {
1526                         /*
1527                          * Can't scan the bus on an adapter that
1528                          * cannot perform the initiator role.
1529                          */
1530                         request_ccb->ccb_h.status = CAM_REQ_CMP;
1531                         xpt_free_ccb(work_ccb);
1532                         xpt_done(request_ccb);
1533                         return;
1534                 }
1535
1536                 /* We may need to reset bus first, if we haven't done it yet. */
1537                 if ((work_ccb->cpi.hba_inquiry &
1538                     (PI_WIDE_32|PI_WIDE_16|PI_SDTR_ABLE)) &&
1539                     !(work_ccb->cpi.hba_misc & PIM_NOBUSRESET) &&
1540                     !timevalisset(&request_ccb->ccb_h.path->bus->last_reset)) {
1541                         reset_ccb = xpt_alloc_ccb_nowait();
1542                         xpt_setup_ccb(&reset_ccb->ccb_h, request_ccb->ccb_h.path,
1543                               CAM_PRIORITY_NONE);
1544                         reset_ccb->ccb_h.func_code = XPT_RESET_BUS;
1545                         xpt_action(reset_ccb);
1546                         if (reset_ccb->ccb_h.status != CAM_REQ_CMP) {
1547                                 request_ccb->ccb_h.status = reset_ccb->ccb_h.status;
1548                                 xpt_free_ccb(reset_ccb);
1549                                 xpt_free_ccb(work_ccb);
1550                                 xpt_done(request_ccb);
1551                                 return;
1552                         }
1553                         xpt_free_ccb(reset_ccb);
1554                 }
1555
1556                 /* Save some state for use while we probe for devices */
1557                 scan_info = (scsi_scan_bus_info *)
1558                     malloc(sizeof(scsi_scan_bus_info), M_CAMXPT, M_NOWAIT);
1559                 if (scan_info == NULL) {
1560                         request_ccb->ccb_h.status = CAM_RESRC_UNAVAIL;
1561                         xpt_done(request_ccb);
1562                         return;
1563                 }
1564                 scan_info->request_ccb = request_ccb;
1565                 scan_info->cpi = &work_ccb->cpi;
1566
1567                 /* Cache on our stack so we can work asynchronously */
1568                 max_target = scan_info->cpi->max_target;
1569                 initiator_id = scan_info->cpi->initiator_id;
1570
1571
1572                 /*
1573                  * We can scan all targets in parallel, or do it sequentially.
1574                  */
1575                 if (scan_info->cpi->hba_misc & PIM_SEQSCAN) {
1576                         max_target = 0;
1577                         scan_info->counter = 0;
1578                 } else {
1579                         scan_info->counter = scan_info->cpi->max_target + 1;
1580                         if (scan_info->cpi->initiator_id < scan_info->counter) {
1581                                 scan_info->counter--;
1582                         }
1583                 }
1584
1585                 for (i = 0; i <= max_target; i++) {
1586                         cam_status status;
1587                         if (i == initiator_id)
1588                                 continue;
1589
1590                         status = xpt_create_path(&path, xpt_periph,
1591                                                  request_ccb->ccb_h.path_id,
1592                                                  i, 0);
1593                         if (status != CAM_REQ_CMP) {
1594                                 printf("scsi_scan_bus: xpt_create_path failed"
1595                                        " with status %#x, bus scan halted\n",
1596                                        status);
1597                                 free(scan_info, M_CAMXPT);
1598                                 request_ccb->ccb_h.status = status;
1599                                 xpt_free_ccb(work_ccb);
1600                                 xpt_done(request_ccb);
1601                                 break;
1602                         }
1603                         work_ccb = xpt_alloc_ccb_nowait();
1604                         if (work_ccb == NULL) {
1605                                 xpt_free_ccb((union ccb *)scan_info->cpi);
1606                                 free(scan_info, M_CAMXPT);
1607                                 xpt_free_path(path);
1608                                 request_ccb->ccb_h.status = CAM_RESRC_UNAVAIL;
1609                                 xpt_done(request_ccb);
1610                                 break;
1611                         }
1612                         xpt_setup_ccb(&work_ccb->ccb_h, path,
1613                                       request_ccb->ccb_h.pinfo.priority);
1614                         work_ccb->ccb_h.func_code = XPT_SCAN_LUN;
1615                         work_ccb->ccb_h.cbfcnp = scsi_scan_bus;
1616                         work_ccb->ccb_h.ppriv_ptr0 = scan_info;
1617                         work_ccb->crcn.flags = request_ccb->crcn.flags;
1618                         xpt_action(work_ccb);
1619                 }
1620                 break;
1621         }
1622         case XPT_SCAN_LUN:
1623         {
1624                 cam_status status;
1625                 struct cam_path *path;
1626                 scsi_scan_bus_info *scan_info;
1627                 path_id_t path_id;
1628                 target_id_t target_id;
1629                 lun_id_t lun_id;
1630
1631                 /* Reuse the same CCB to query if a device was really found */
1632                 scan_info = (scsi_scan_bus_info *)request_ccb->ccb_h.ppriv_ptr0;
1633                 xpt_setup_ccb(&request_ccb->ccb_h, request_ccb->ccb_h.path,
1634                               request_ccb->ccb_h.pinfo.priority);
1635                 request_ccb->ccb_h.func_code = XPT_GDEV_TYPE;
1636
1637                 path_id = request_ccb->ccb_h.path_id;
1638                 target_id = request_ccb->ccb_h.target_id;
1639                 lun_id = request_ccb->ccb_h.target_lun;
1640                 xpt_action(request_ccb);
1641
1642                 if (request_ccb->ccb_h.status != CAM_REQ_CMP) {
1643                         struct cam_ed *device;
1644                         struct cam_et *target;
1645                         int phl;
1646
1647                         /*
1648                          * If we already probed lun 0 successfully, or
1649                          * we have additional configured luns on this
1650                          * target that might have "gone away", go onto
1651                          * the next lun.
1652                          */
1653                         target = request_ccb->ccb_h.path->target;
1654                         /*
1655                          * We may touch devices that we don't
1656                          * hold references too, so ensure they
1657                          * don't disappear out from under us.
1658                          * The target above is referenced by the
1659                          * path in the request ccb.
1660                          */
1661                         phl = 0;
1662                         device = TAILQ_FIRST(&target->ed_entries);
1663                         if (device != NULL) {
1664                                 phl = CAN_SRCH_HI_SPARSE(device);
1665                                 if (device->lun_id == 0)
1666                                         device = TAILQ_NEXT(device, links);
1667                         }
1668                         if ((lun_id != 0) || (device != NULL)) {
1669                                 if (lun_id < (CAM_SCSI2_MAXLUN-1) || phl)
1670                                         lun_id++;
1671                         }
1672                 } else {
1673                         struct cam_ed *device;
1674
1675                         device = request_ccb->ccb_h.path->device;
1676
1677                         if ((SCSI_QUIRK(device)->quirks &
1678                             CAM_QUIRK_NOLUNS) == 0) {
1679                                 /* Try the next lun */
1680                                 if (lun_id < (CAM_SCSI2_MAXLUN-1)
1681                                   || CAN_SRCH_HI_DENSE(device))
1682                                         lun_id++;
1683                         }
1684                 }
1685
1686                 /*
1687                  * Free the current request path- we're done with it.
1688                  */
1689                 xpt_free_path(request_ccb->ccb_h.path);
1690
1691                 /*
1692                  * Check to see if we scan any further luns.
1693                  */
1694                 if (lun_id == request_ccb->ccb_h.target_lun
1695                  || lun_id > scan_info->cpi->max_lun) {
1696                         int done;
1697
1698  hop_again:
1699                         done = 0;
1700                         if (scan_info->cpi->hba_misc & PIM_SEQSCAN) {
1701                                 scan_info->counter++;
1702                                 if (scan_info->counter ==
1703                                     scan_info->cpi->initiator_id) {
1704                                         scan_info->counter++;
1705                                 }
1706                                 if (scan_info->counter >=
1707                                     scan_info->cpi->max_target+1) {
1708                                         done = 1;
1709                                 }
1710                         } else {
1711                                 scan_info->counter--;
1712                                 if (scan_info->counter == 0) {
1713                                         done = 1;
1714                                 }
1715                         }
1716                         if (done) {
1717                                 xpt_free_ccb(request_ccb);
1718                                 xpt_free_ccb((union ccb *)scan_info->cpi);
1719                                 request_ccb = scan_info->request_ccb;
1720                                 free(scan_info, M_CAMXPT);
1721                                 request_ccb->ccb_h.status = CAM_REQ_CMP;
1722                                 xpt_done(request_ccb);
1723                                 break;
1724                         }
1725
1726                         if ((scan_info->cpi->hba_misc & PIM_SEQSCAN) == 0) {
1727                                 xpt_free_ccb(request_ccb);
1728                                 break;
1729                         }
1730                         status = xpt_create_path(&path, xpt_periph,
1731                             scan_info->request_ccb->ccb_h.path_id,
1732                             scan_info->counter, 0);
1733                         if (status != CAM_REQ_CMP) {
1734                                 printf("scsi_scan_bus: xpt_create_path failed"
1735                                     " with status %#x, bus scan halted\n",
1736                                     status);
1737                                 xpt_free_ccb(request_ccb);
1738                                 xpt_free_ccb((union ccb *)scan_info->cpi);
1739                                 request_ccb = scan_info->request_ccb;
1740                                 free(scan_info, M_CAMXPT);
1741                                 request_ccb->ccb_h.status = status;
1742                                 xpt_done(request_ccb);
1743                                 break;
1744                         }
1745                         xpt_setup_ccb(&request_ccb->ccb_h, path,
1746                             request_ccb->ccb_h.pinfo.priority);
1747                         request_ccb->ccb_h.func_code = XPT_SCAN_LUN;
1748                         request_ccb->ccb_h.cbfcnp = scsi_scan_bus;
1749                         request_ccb->ccb_h.ppriv_ptr0 = scan_info;
1750                         request_ccb->crcn.flags =
1751                             scan_info->request_ccb->crcn.flags;
1752                 } else {
1753                         status = xpt_create_path(&path, xpt_periph,
1754                                                  path_id, target_id, lun_id);
1755                         if (status != CAM_REQ_CMP) {
1756                                 printf("scsi_scan_bus: xpt_create_path failed "
1757                                        "with status %#x, halting LUN scan\n",
1758                                        status);
1759                                 goto hop_again;
1760                         }
1761                         xpt_setup_ccb(&request_ccb->ccb_h, path,
1762                                       request_ccb->ccb_h.pinfo.priority);
1763                         request_ccb->ccb_h.func_code = XPT_SCAN_LUN;
1764                         request_ccb->ccb_h.cbfcnp = scsi_scan_bus;
1765                         request_ccb->ccb_h.ppriv_ptr0 = scan_info;
1766                         request_ccb->crcn.flags =
1767                                 scan_info->request_ccb->crcn.flags;
1768                 }
1769                 xpt_action(request_ccb);
1770                 break;
1771         }
1772         default:
1773                 break;
1774         }
1775 }
1776
1777 static void
1778 scsi_scan_lun(struct cam_periph *periph, struct cam_path *path,
1779              cam_flags flags, union ccb *request_ccb)
1780 {
1781         struct ccb_pathinq cpi;
1782         cam_status status;
1783         struct cam_path *new_path;
1784         struct cam_periph *old_periph;
1785
1786         CAM_DEBUG(path, CAM_DEBUG_TRACE, ("scsi_scan_lun\n"));
1787
1788         xpt_setup_ccb(&cpi.ccb_h, path, CAM_PRIORITY_NONE);
1789         cpi.ccb_h.func_code = XPT_PATH_INQ;
1790         xpt_action((union ccb *)&cpi);
1791
1792         if (cpi.ccb_h.status != CAM_REQ_CMP) {
1793                 if (request_ccb != NULL) {
1794                         request_ccb->ccb_h.status = cpi.ccb_h.status;
1795                         xpt_done(request_ccb);
1796                 }
1797                 return;
1798         }
1799
1800         if ((cpi.hba_misc & PIM_NOINITIATOR) != 0) {
1801                 /*
1802                  * Can't scan the bus on an adapter that
1803                  * cannot perform the initiator role.
1804                  */
1805                 if (request_ccb != NULL) {
1806                         request_ccb->ccb_h.status = CAM_REQ_CMP;
1807                         xpt_done(request_ccb);
1808                 }
1809                 return;
1810         }
1811
1812         if (request_ccb == NULL) {
1813                 request_ccb = malloc(sizeof(union ccb), M_CAMXPT, M_NOWAIT);
1814                 if (request_ccb == NULL) {
1815                         xpt_print(path, "scsi_scan_lun: can't allocate CCB, "
1816                             "can't continue\n");
1817                         return;
1818                 }
1819                 new_path = malloc(sizeof(*new_path), M_CAMXPT, M_NOWAIT);
1820                 if (new_path == NULL) {
1821                         xpt_print(path, "scsi_scan_lun: can't allocate path, "
1822                             "can't continue\n");
1823                         free(request_ccb, M_CAMXPT);
1824                         return;
1825                 }
1826                 status = xpt_compile_path(new_path, xpt_periph,
1827                                           path->bus->path_id,
1828                                           path->target->target_id,
1829                                           path->device->lun_id);
1830
1831                 if (status != CAM_REQ_CMP) {
1832                         xpt_print(path, "scsi_scan_lun: can't compile path, "
1833                             "can't continue\n");
1834                         free(request_ccb, M_CAMXPT);
1835                         free(new_path, M_CAMXPT);
1836                         return;
1837                 }
1838                 xpt_setup_ccb(&request_ccb->ccb_h, new_path, CAM_PRIORITY_XPT);
1839                 request_ccb->ccb_h.cbfcnp = xptscandone;
1840                 request_ccb->ccb_h.func_code = XPT_SCAN_LUN;
1841                 request_ccb->crcn.flags = flags;
1842         }
1843
1844         if ((old_periph = cam_periph_find(path, "probe")) != NULL) {
1845                 probe_softc *softc;
1846
1847                 softc = (probe_softc *)old_periph->softc;
1848                 TAILQ_INSERT_TAIL(&softc->request_ccbs, &request_ccb->ccb_h,
1849                                   periph_links.tqe);
1850         } else {
1851                 status = cam_periph_alloc(proberegister, NULL, probecleanup,
1852                                           probestart, "probe",
1853                                           CAM_PERIPH_BIO,
1854                                           request_ccb->ccb_h.path, NULL, 0,
1855                                           request_ccb);
1856
1857                 if (status != CAM_REQ_CMP) {
1858                         xpt_print(path, "scsi_scan_lun: cam_alloc_periph "
1859                             "returned an error, can't continue probe\n");
1860                         request_ccb->ccb_h.status = status;
1861                         xpt_done(request_ccb);
1862                 }
1863         }
1864 }
1865
1866 static void
1867 xptscandone(struct cam_periph *periph, union ccb *done_ccb)
1868 {
1869         xpt_release_path(done_ccb->ccb_h.path);
1870         free(done_ccb->ccb_h.path, M_CAMXPT);
1871         free(done_ccb, M_CAMXPT);
1872 }
1873
1874 static struct cam_ed *
1875 scsi_alloc_device(struct cam_eb *bus, struct cam_et *target, lun_id_t lun_id)
1876 {
1877         struct cam_path path;
1878         struct scsi_quirk_entry *quirk;
1879         struct cam_ed *device;
1880         struct cam_ed *cur_device;
1881
1882         device = xpt_alloc_device(bus, target, lun_id);
1883         if (device == NULL)
1884                 return (NULL);
1885
1886         /*
1887          * Take the default quirk entry until we have inquiry
1888          * data and can determine a better quirk to use.
1889          */
1890         quirk = &scsi_quirk_table[scsi_quirk_table_size - 1];
1891         device->quirk = (void *)quirk;
1892         device->mintags = quirk->mintags;
1893         device->maxtags = quirk->maxtags;
1894         bzero(&device->inq_data, sizeof(device->inq_data));
1895         device->inq_flags = 0;
1896         device->queue_flags = 0;
1897         device->serial_num = NULL;
1898         device->serial_num_len = 0;
1899
1900         /*
1901          * XXX should be limited by number of CCBs this bus can
1902          * do.
1903          */
1904         bus->sim->max_ccbs += device->ccbq.devq_openings;
1905         /* Insertion sort into our target's device list */
1906         cur_device = TAILQ_FIRST(&target->ed_entries);
1907         while (cur_device != NULL && cur_device->lun_id < lun_id)
1908                 cur_device = TAILQ_NEXT(cur_device, links);
1909         if (cur_device != NULL) {
1910                 TAILQ_INSERT_BEFORE(cur_device, device, links);
1911         } else {
1912                 TAILQ_INSERT_TAIL(&target->ed_entries, device, links);
1913         }
1914         target->generation++;
1915         if (lun_id != CAM_LUN_WILDCARD) {
1916                 xpt_compile_path(&path,
1917                                  NULL,
1918                                  bus->path_id,
1919                                  target->target_id,
1920                                  lun_id);
1921                 scsi_devise_transport(&path);
1922                 xpt_release_path(&path);
1923         }
1924
1925         return (device);
1926 }
1927
1928 static void
1929 scsi_devise_transport(struct cam_path *path)
1930 {
1931         struct ccb_pathinq cpi;
1932         struct ccb_trans_settings cts;
1933         struct scsi_inquiry_data *inq_buf;
1934
1935         /* Get transport information from the SIM */
1936         xpt_setup_ccb(&cpi.ccb_h, path, CAM_PRIORITY_NONE);
1937         cpi.ccb_h.func_code = XPT_PATH_INQ;
1938         xpt_action((union ccb *)&cpi);
1939
1940         inq_buf = NULL;
1941         if ((path->device->flags & CAM_DEV_INQUIRY_DATA_VALID) != 0)
1942                 inq_buf = &path->device->inq_data;
1943         path->device->protocol = PROTO_SCSI;
1944         path->device->protocol_version =
1945             inq_buf != NULL ? SID_ANSI_REV(inq_buf) : cpi.protocol_version;
1946         path->device->transport = cpi.transport;
1947         path->device->transport_version = cpi.transport_version;
1948
1949         /*
1950          * Any device not using SPI3 features should
1951          * be considered SPI2 or lower.
1952          */
1953         if (inq_buf != NULL) {
1954                 if (path->device->transport == XPORT_SPI
1955                  && (inq_buf->spi3data & SID_SPI_MASK) == 0
1956                  && path->device->transport_version > 2)
1957                         path->device->transport_version = 2;
1958         } else {
1959                 struct cam_ed* otherdev;
1960
1961                 for (otherdev = TAILQ_FIRST(&path->target->ed_entries);
1962                      otherdev != NULL;
1963                      otherdev = TAILQ_NEXT(otherdev, links)) {
1964                         if (otherdev != path->device)
1965                                 break;
1966                 }
1967
1968                 if (otherdev != NULL) {
1969                         /*
1970                          * Initially assume the same versioning as
1971                          * prior luns for this target.
1972                          */
1973                         path->device->protocol_version =
1974                             otherdev->protocol_version;
1975                         path->device->transport_version =
1976                             otherdev->transport_version;
1977                 } else {
1978                         /* Until we know better, opt for safty */
1979                         path->device->protocol_version = 2;
1980                         if (path->device->transport == XPORT_SPI)
1981                                 path->device->transport_version = 2;
1982                         else
1983                                 path->device->transport_version = 0;
1984                 }
1985         }
1986
1987         /*
1988          * XXX
1989          * For a device compliant with SPC-2 we should be able
1990          * to determine the transport version supported by
1991          * scrutinizing the version descriptors in the
1992          * inquiry buffer.
1993          */
1994
1995         /* Tell the controller what we think */
1996         xpt_setup_ccb(&cts.ccb_h, path, CAM_PRIORITY_NONE);
1997         cts.ccb_h.func_code = XPT_SET_TRAN_SETTINGS;
1998         cts.type = CTS_TYPE_CURRENT_SETTINGS;
1999         cts.transport = path->device->transport;
2000         cts.transport_version = path->device->transport_version;
2001         cts.protocol = path->device->protocol;
2002         cts.protocol_version = path->device->protocol_version;
2003         cts.proto_specific.valid = 0;
2004         cts.xport_specific.valid = 0;
2005         xpt_action((union ccb *)&cts);
2006 }
2007
2008 static void
2009 scsi_action(union ccb *start_ccb)
2010 {
2011
2012         switch (start_ccb->ccb_h.func_code) {
2013         case XPT_SET_TRAN_SETTINGS:
2014         {
2015                 scsi_set_transfer_settings(&start_ccb->cts,
2016                                            start_ccb->ccb_h.path->device,
2017                                            /*async_update*/FALSE);
2018                 break;
2019         }
2020         case XPT_SCAN_BUS:
2021                 scsi_scan_bus(start_ccb->ccb_h.path->periph, start_ccb);
2022                 break;
2023         case XPT_SCAN_LUN:
2024                 scsi_scan_lun(start_ccb->ccb_h.path->periph,
2025                               start_ccb->ccb_h.path, start_ccb->crcn.flags,
2026                               start_ccb);
2027                 break;
2028         case XPT_GET_TRAN_SETTINGS:
2029         {
2030                 struct cam_sim *sim;
2031
2032                 sim = start_ccb->ccb_h.path->bus->sim;
2033                 (*(sim->sim_action))(sim, start_ccb);
2034                 break;
2035         }
2036         default:
2037                 xpt_action_default(start_ccb);
2038                 break;
2039         }
2040 }
2041
2042 static void
2043 scsi_set_transfer_settings(struct ccb_trans_settings *cts, struct cam_ed *device,
2044                            int async_update)
2045 {
2046         struct  ccb_pathinq cpi;
2047         struct  ccb_trans_settings cur_cts;
2048         struct  ccb_trans_settings_scsi *scsi;
2049         struct  ccb_trans_settings_scsi *cur_scsi;
2050         struct  cam_sim *sim;
2051         struct  scsi_inquiry_data *inq_data;
2052
2053         if (device == NULL) {
2054                 cts->ccb_h.status = CAM_PATH_INVALID;
2055                 xpt_done((union ccb *)cts);
2056                 return;
2057         }
2058
2059         if (cts->protocol == PROTO_UNKNOWN
2060          || cts->protocol == PROTO_UNSPECIFIED) {
2061                 cts->protocol = device->protocol;
2062                 cts->protocol_version = device->protocol_version;
2063         }
2064
2065         if (cts->protocol_version == PROTO_VERSION_UNKNOWN
2066          || cts->protocol_version == PROTO_VERSION_UNSPECIFIED)
2067                 cts->protocol_version = device->protocol_version;
2068
2069         if (cts->protocol != device->protocol) {
2070                 xpt_print(cts->ccb_h.path, "Uninitialized Protocol %x:%x?\n",
2071                        cts->protocol, device->protocol);
2072                 cts->protocol = device->protocol;
2073         }
2074
2075         if (cts->protocol_version > device->protocol_version) {
2076                 if (bootverbose) {
2077                         xpt_print(cts->ccb_h.path, "Down reving Protocol "
2078                             "Version from %d to %d?\n", cts->protocol_version,
2079                             device->protocol_version);
2080                 }
2081                 cts->protocol_version = device->protocol_version;
2082         }
2083
2084         if (cts->transport == XPORT_UNKNOWN
2085          || cts->transport == XPORT_UNSPECIFIED) {
2086                 cts->transport = device->transport;
2087                 cts->transport_version = device->transport_version;
2088         }
2089
2090         if (cts->transport_version == XPORT_VERSION_UNKNOWN
2091          || cts->transport_version == XPORT_VERSION_UNSPECIFIED)
2092                 cts->transport_version = device->transport_version;
2093
2094         if (cts->transport != device->transport) {
2095                 xpt_print(cts->ccb_h.path, "Uninitialized Transport %x:%x?\n",
2096                     cts->transport, device->transport);
2097                 cts->transport = device->transport;
2098         }
2099
2100         if (cts->transport_version > device->transport_version) {
2101                 if (bootverbose) {
2102                         xpt_print(cts->ccb_h.path, "Down reving Transport "
2103                             "Version from %d to %d?\n", cts->transport_version,
2104                             device->transport_version);
2105                 }
2106                 cts->transport_version = device->transport_version;
2107         }
2108
2109         sim = cts->ccb_h.path->bus->sim;
2110
2111         /*
2112          * Nothing more of interest to do unless
2113          * this is a device connected via the
2114          * SCSI protocol.
2115          */
2116         if (cts->protocol != PROTO_SCSI) {
2117                 if (async_update == FALSE)
2118                         (*(sim->sim_action))(sim, (union ccb *)cts);
2119                 return;
2120         }
2121
2122         inq_data = &device->inq_data;
2123         scsi = &cts->proto_specific.scsi;
2124         xpt_setup_ccb(&cpi.ccb_h, cts->ccb_h.path, CAM_PRIORITY_NONE);
2125         cpi.ccb_h.func_code = XPT_PATH_INQ;
2126         xpt_action((union ccb *)&cpi);
2127
2128         /* SCSI specific sanity checking */
2129         if ((cpi.hba_inquiry & PI_TAG_ABLE) == 0
2130          || (INQ_DATA_TQ_ENABLED(inq_data)) == 0
2131          || (device->queue_flags & SCP_QUEUE_DQUE) != 0
2132          || (device->mintags == 0)) {
2133                 /*
2134                  * Can't tag on hardware that doesn't support tags,
2135                  * doesn't have it enabled, or has broken tag support.
2136                  */
2137                 scsi->flags &= ~CTS_SCSI_FLAGS_TAG_ENB;
2138         }
2139
2140         if (async_update == FALSE) {
2141                 /*
2142                  * Perform sanity checking against what the
2143                  * controller and device can do.
2144                  */
2145                 xpt_setup_ccb(&cur_cts.ccb_h, cts->ccb_h.path, CAM_PRIORITY_NONE);
2146                 cur_cts.ccb_h.func_code = XPT_GET_TRAN_SETTINGS;
2147                 cur_cts.type = cts->type;
2148                 xpt_action((union ccb *)&cur_cts);
2149                 if ((cur_cts.ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_CMP) {
2150                         return;
2151                 }
2152                 cur_scsi = &cur_cts.proto_specific.scsi;
2153                 if ((scsi->valid & CTS_SCSI_VALID_TQ) == 0) {
2154                         scsi->flags &= ~CTS_SCSI_FLAGS_TAG_ENB;
2155                         scsi->flags |= cur_scsi->flags & CTS_SCSI_FLAGS_TAG_ENB;
2156                 }
2157                 if ((cur_scsi->valid & CTS_SCSI_VALID_TQ) == 0)
2158                         scsi->flags &= ~CTS_SCSI_FLAGS_TAG_ENB;
2159         }
2160
2161         /* SPI specific sanity checking */
2162         if (cts->transport == XPORT_SPI && async_update == FALSE) {
2163                 u_int spi3caps;
2164                 struct ccb_trans_settings_spi *spi;
2165                 struct ccb_trans_settings_spi *cur_spi;
2166
2167                 spi = &cts->xport_specific.spi;
2168
2169                 cur_spi = &cur_cts.xport_specific.spi;
2170
2171                 /* Fill in any gaps in what the user gave us */
2172                 if ((spi->valid & CTS_SPI_VALID_SYNC_RATE) == 0)
2173                         spi->sync_period = cur_spi->sync_period;
2174                 if ((cur_spi->valid & CTS_SPI_VALID_SYNC_RATE) == 0)
2175                         spi->sync_period = 0;
2176                 if ((spi->valid & CTS_SPI_VALID_SYNC_OFFSET) == 0)
2177                         spi->sync_offset = cur_spi->sync_offset;
2178                 if ((cur_spi->valid & CTS_SPI_VALID_SYNC_OFFSET) == 0)
2179                         spi->sync_offset = 0;
2180                 if ((spi->valid & CTS_SPI_VALID_PPR_OPTIONS) == 0)
2181                         spi->ppr_options = cur_spi->ppr_options;
2182                 if ((cur_spi->valid & CTS_SPI_VALID_PPR_OPTIONS) == 0)
2183                         spi->ppr_options = 0;
2184                 if ((spi->valid & CTS_SPI_VALID_BUS_WIDTH) == 0)
2185                         spi->bus_width = cur_spi->bus_width;
2186                 if ((cur_spi->valid & CTS_SPI_VALID_BUS_WIDTH) == 0)
2187                         spi->bus_width = 0;
2188                 if ((spi->valid & CTS_SPI_VALID_DISC) == 0) {
2189                         spi->flags &= ~CTS_SPI_FLAGS_DISC_ENB;
2190                         spi->flags |= cur_spi->flags & CTS_SPI_FLAGS_DISC_ENB;
2191                 }
2192                 if ((cur_spi->valid & CTS_SPI_VALID_DISC) == 0)
2193                         spi->flags &= ~CTS_SPI_FLAGS_DISC_ENB;
2194                 if (((device->flags & CAM_DEV_INQUIRY_DATA_VALID) != 0
2195                   && (inq_data->flags & SID_Sync) == 0
2196                   && cts->type == CTS_TYPE_CURRENT_SETTINGS)
2197                  || ((cpi.hba_inquiry & PI_SDTR_ABLE) == 0)) {
2198                         /* Force async */
2199                         spi->sync_period = 0;
2200                         spi->sync_offset = 0;
2201                 }
2202
2203                 switch (spi->bus_width) {
2204                 case MSG_EXT_WDTR_BUS_32_BIT:
2205                         if (((device->flags & CAM_DEV_INQUIRY_DATA_VALID) == 0
2206                           || (inq_data->flags & SID_WBus32) != 0
2207                           || cts->type == CTS_TYPE_USER_SETTINGS)
2208                          && (cpi.hba_inquiry & PI_WIDE_32) != 0)
2209                                 break;
2210                         /* Fall Through to 16-bit */
2211                 case MSG_EXT_WDTR_BUS_16_BIT:
2212                         if (((device->flags & CAM_DEV_INQUIRY_DATA_VALID) == 0
2213                           || (inq_data->flags & SID_WBus16) != 0
2214                           || cts->type == CTS_TYPE_USER_SETTINGS)
2215                          && (cpi.hba_inquiry & PI_WIDE_16) != 0) {
2216                                 spi->bus_width = MSG_EXT_WDTR_BUS_16_BIT;
2217                                 break;
2218                         }
2219                         /* Fall Through to 8-bit */
2220                 default: /* New bus width?? */
2221                 case MSG_EXT_WDTR_BUS_8_BIT:
2222                         /* All targets can do this */
2223                         spi->bus_width = MSG_EXT_WDTR_BUS_8_BIT;
2224                         break;
2225                 }
2226
2227                 spi3caps = cpi.xport_specific.spi.ppr_options;
2228                 if ((device->flags & CAM_DEV_INQUIRY_DATA_VALID) != 0
2229                  && cts->type == CTS_TYPE_CURRENT_SETTINGS)
2230                         spi3caps &= inq_data->spi3data;
2231
2232                 if ((spi3caps & SID_SPI_CLOCK_DT) == 0)
2233                         spi->ppr_options &= ~MSG_EXT_PPR_DT_REQ;
2234
2235                 if ((spi3caps & SID_SPI_IUS) == 0)
2236                         spi->ppr_options &= ~MSG_EXT_PPR_IU_REQ;
2237
2238                 if ((spi3caps & SID_SPI_QAS) == 0)
2239                         spi->ppr_options &= ~MSG_EXT_PPR_QAS_REQ;
2240
2241                 /* No SPI Transfer settings are allowed unless we are wide */
2242                 if (spi->bus_width == 0)
2243                         spi->ppr_options = 0;
2244
2245                 if ((spi->valid & CTS_SPI_VALID_DISC)
2246                  && ((spi->flags & CTS_SPI_FLAGS_DISC_ENB) == 0)) {
2247                         /*
2248                          * Can't tag queue without disconnection.
2249                          */
2250                         scsi->flags &= ~CTS_SCSI_FLAGS_TAG_ENB;
2251                         scsi->valid |= CTS_SCSI_VALID_TQ;
2252                 }
2253
2254                 /*
2255                  * If we are currently performing tagged transactions to
2256                  * this device and want to change its negotiation parameters,
2257                  * go non-tagged for a bit to give the controller a chance to
2258                  * negotiate unhampered by tag messages.
2259                  */
2260                 if (cts->type == CTS_TYPE_CURRENT_SETTINGS
2261                  && (device->inq_flags & SID_CmdQue) != 0
2262                  && (scsi->flags & CTS_SCSI_FLAGS_TAG_ENB) != 0
2263                  && (spi->flags & (CTS_SPI_VALID_SYNC_RATE|
2264                                    CTS_SPI_VALID_SYNC_OFFSET|
2265                                    CTS_SPI_VALID_BUS_WIDTH)) != 0)
2266                         scsi_toggle_tags(cts->ccb_h.path);
2267         }
2268
2269         if (cts->type == CTS_TYPE_CURRENT_SETTINGS
2270          && (scsi->valid & CTS_SCSI_VALID_TQ) != 0) {
2271                 int device_tagenb;
2272
2273                 /*
2274                  * If we are transitioning from tags to no-tags or
2275                  * vice-versa, we need to carefully freeze and restart
2276                  * the queue so that we don't overlap tagged and non-tagged
2277                  * commands.  We also temporarily stop tags if there is
2278                  * a change in transfer negotiation settings to allow
2279                  * "tag-less" negotiation.
2280                  */
2281                 if ((device->flags & CAM_DEV_TAG_AFTER_COUNT) != 0
2282                  || (device->inq_flags & SID_CmdQue) != 0)
2283                         device_tagenb = TRUE;
2284                 else
2285                         device_tagenb = FALSE;
2286
2287                 if (((scsi->flags & CTS_SCSI_FLAGS_TAG_ENB) != 0
2288                   && device_tagenb == FALSE)
2289                  || ((scsi->flags & CTS_SCSI_FLAGS_TAG_ENB) == 0
2290                   && device_tagenb == TRUE)) {
2291
2292                         if ((scsi->flags & CTS_SCSI_FLAGS_TAG_ENB) != 0) {
2293                                 /*
2294                                  * Delay change to use tags until after a
2295                                  * few commands have gone to this device so
2296                                  * the controller has time to perform transfer
2297                                  * negotiations without tagged messages getting
2298                                  * in the way.
2299                                  */
2300                                 device->tag_delay_count = CAM_TAG_DELAY_COUNT;
2301                                 device->flags |= CAM_DEV_TAG_AFTER_COUNT;
2302                         } else {
2303                                 xpt_stop_tags(cts->ccb_h.path);
2304                         }
2305                 }
2306         }
2307         if (async_update == FALSE)
2308                 (*(sim->sim_action))(sim, (union ccb *)cts);
2309 }
2310
2311 static void
2312 scsi_toggle_tags(struct cam_path *path)
2313 {
2314         struct cam_ed *dev;
2315
2316         /*
2317          * Give controllers a chance to renegotiate
2318          * before starting tag operations.  We
2319          * "toggle" tagged queuing off then on
2320          * which causes the tag enable command delay
2321          * counter to come into effect.
2322          */
2323         dev = path->device;
2324         if ((dev->flags & CAM_DEV_TAG_AFTER_COUNT) != 0
2325          || ((dev->inq_flags & SID_CmdQue) != 0
2326           && (dev->inq_flags & (SID_Sync|SID_WBus16|SID_WBus32)) != 0)) {
2327                 struct ccb_trans_settings cts;
2328
2329                 xpt_setup_ccb(&cts.ccb_h, path, CAM_PRIORITY_NONE);
2330                 cts.protocol = PROTO_SCSI;
2331                 cts.protocol_version = PROTO_VERSION_UNSPECIFIED;
2332                 cts.transport = XPORT_UNSPECIFIED;
2333                 cts.transport_version = XPORT_VERSION_UNSPECIFIED;
2334                 cts.proto_specific.scsi.flags = 0;
2335                 cts.proto_specific.scsi.valid = CTS_SCSI_VALID_TQ;
2336                 scsi_set_transfer_settings(&cts, path->device,
2337                                           /*async_update*/TRUE);
2338                 cts.proto_specific.scsi.flags = CTS_SCSI_FLAGS_TAG_ENB;
2339                 scsi_set_transfer_settings(&cts, path->device,
2340                                           /*async_update*/TRUE);
2341         }
2342 }
2343
2344 /*
2345  * Handle any per-device event notifications that require action by the XPT.
2346  */
2347 static void
2348 scsi_dev_async(u_int32_t async_code, struct cam_eb *bus, struct cam_et *target,
2349               struct cam_ed *device, void *async_arg)
2350 {
2351         cam_status status;
2352         struct cam_path newpath;
2353
2354         /*
2355          * We only need to handle events for real devices.
2356          */
2357         if (target->target_id == CAM_TARGET_WILDCARD
2358          || device->lun_id == CAM_LUN_WILDCARD)
2359                 return;
2360
2361         /*
2362          * We need our own path with wildcards expanded to
2363          * handle certain types of events.
2364          */
2365         if ((async_code == AC_SENT_BDR)
2366          || (async_code == AC_BUS_RESET)
2367          || (async_code == AC_INQ_CHANGED))
2368                 status = xpt_compile_path(&newpath, NULL,
2369                                           bus->path_id,
2370                                           target->target_id,
2371                                           device->lun_id);
2372         else
2373                 status = CAM_REQ_CMP_ERR;
2374
2375         if (status == CAM_REQ_CMP) {
2376
2377                 /*
2378                  * Allow transfer negotiation to occur in a
2379                  * tag free environment and after settle delay.
2380                  */
2381                 if (async_code == AC_SENT_BDR
2382                  || async_code == AC_BUS_RESET) {
2383                         cam_freeze_devq(&newpath); 
2384                         cam_release_devq(&newpath,
2385                                 RELSIM_RELEASE_AFTER_TIMEOUT,
2386                                 /*reduction*/0,
2387                                 /*timeout*/scsi_delay,
2388                                 /*getcount_only*/0);
2389                         scsi_toggle_tags(&newpath);
2390                 }
2391
2392                 if (async_code == AC_INQ_CHANGED) {
2393                         /*
2394                          * We've sent a start unit command, or
2395                          * something similar to a device that
2396                          * may have caused its inquiry data to
2397                          * change. So we re-scan the device to
2398                          * refresh the inquiry data for it.
2399                          */
2400                         scsi_scan_lun(newpath.periph, &newpath,
2401                                      CAM_EXPECT_INQ_CHANGE, NULL);
2402                 }
2403                 xpt_release_path(&newpath);
2404         } else if (async_code == AC_LOST_DEVICE &&
2405             (device->flags & CAM_DEV_UNCONFIGURED) == 0) {
2406                 device->flags |= CAM_DEV_UNCONFIGURED;
2407                 xpt_release_device(device);
2408         } else if (async_code == AC_TRANSFER_NEG) {
2409                 struct ccb_trans_settings *settings;
2410
2411                 settings = (struct ccb_trans_settings *)async_arg;
2412                 scsi_set_transfer_settings(settings, device,
2413                                           /*async_update*/TRUE);
2414         }
2415 }
2416