This commit represents a major revamping of the clock interrupt and timebase
[dragonfly.git] / sys / bus / cam / cam_xpt.c
1 /*
2  * Implementation of the Common Access Method Transport (XPT) layer.
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  * $FreeBSD: src/sys/cam/cam_xpt.c,v 1.80.2.18 2002/12/09 17:31:55 gibbs Exp $
30  * $DragonFly: src/sys/bus/cam/cam_xpt.c,v 1.9 2004/01/30 05:42:09 dillon Exp $
31  */
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/types.h>
35 #include <sys/malloc.h>
36 #include <sys/kernel.h>
37 #include <sys/time.h>
38 #include <sys/conf.h>
39 #include <sys/fcntl.h>
40 #include <sys/md5.h>
41 #include <sys/devicestat.h>
42 #include <sys/interrupt.h>
43 #include <sys/bus.h>
44
45 #ifdef PC98
46 #include <pc98/pc98/pc98_machdep.h>     /* geometry translation */
47 #endif
48
49 #include <machine/clock.h>
50 #include <machine/ipl.h>
51
52 #include "cam.h"
53 #include "cam_ccb.h"
54 #include "cam_periph.h"
55 #include "cam_sim.h"
56 #include "cam_xpt.h"
57 #include "cam_xpt_sim.h"
58 #include "cam_xpt_periph.h"
59 #include "cam_debug.h"
60
61 #include "scsi/scsi_all.h"
62 #include "scsi/scsi_message.h"
63 #include "scsi/scsi_pass.h"
64 #include "opt_cam.h"
65
66 /* Datastructures internal to the xpt layer */
67
68 /*
69  * Definition of an async handler callback block.  These are used to add
70  * SIMs and peripherals to the async callback lists.
71  */
72 struct async_node {
73         SLIST_ENTRY(async_node) links;
74         u_int32_t       event_enable;   /* Async Event enables */
75         void            (*callback)(void *arg, u_int32_t code,
76                                     struct cam_path *path, void *args);
77         void            *callback_arg;
78 };
79
80 SLIST_HEAD(async_list, async_node);
81 SLIST_HEAD(periph_list, cam_periph);
82 static STAILQ_HEAD(highpowerlist, ccb_hdr) highpowerq;
83
84 /*
85  * This is the maximum number of high powered commands (e.g. start unit)
86  * that can be outstanding at a particular time.
87  */
88 #ifndef CAM_MAX_HIGHPOWER
89 #define CAM_MAX_HIGHPOWER  4
90 #endif
91
92 /* number of high powered commands that can go through right now */
93 static int num_highpower = CAM_MAX_HIGHPOWER;
94
95 /*
96  * Structure for queueing a device in a run queue.
97  * There is one run queue for allocating new ccbs,
98  * and another for sending ccbs to the controller.
99  */
100 struct cam_ed_qinfo {
101         cam_pinfo pinfo;
102         struct    cam_ed *device;
103 };
104
105 /*
106  * The CAM EDT (Existing Device Table) contains the device information for
107  * all devices for all busses in the system.  The table contains a
108  * cam_ed structure for each device on the bus.
109  */
110 struct cam_ed {
111         TAILQ_ENTRY(cam_ed) links;
112         struct  cam_ed_qinfo alloc_ccb_entry;
113         struct  cam_ed_qinfo send_ccb_entry;
114         struct  cam_et   *target;
115         lun_id_t         lun_id;
116         struct  camq drvq;              /*
117                                          * Queue of type drivers wanting to do
118                                          * work on this device.
119                                          */
120         struct  cam_ccbq ccbq;          /* Queue of pending ccbs */
121         struct  async_list asyncs;      /* Async callback info for this B/T/L */
122         struct  periph_list periphs;    /* All attached devices */
123         u_int   generation;             /* Generation number */
124         struct  cam_periph *owner;      /* Peripheral driver's ownership tag */
125         struct  xpt_quirk_entry *quirk; /* Oddities about this device */
126                                         /* Storage for the inquiry data */
127         struct  scsi_inquiry_data inq_data;
128         u_int8_t         inq_flags;     /*
129                                          * Current settings for inquiry flags.
130                                          * This allows us to override settings
131                                          * like disconnection and tagged
132                                          * queuing for a device.
133                                          */
134         u_int8_t         queue_flags;   /* Queue flags from the control page */
135         u_int8_t         serial_num_len;
136         u_int8_t         *serial_num;
137         u_int32_t        qfrozen_cnt;
138         u_int32_t        flags;
139 #define CAM_DEV_UNCONFIGURED            0x01
140 #define CAM_DEV_REL_TIMEOUT_PENDING     0x02
141 #define CAM_DEV_REL_ON_COMPLETE         0x04
142 #define CAM_DEV_REL_ON_QUEUE_EMPTY      0x08
143 #define CAM_DEV_RESIZE_QUEUE_NEEDED     0x10
144 #define CAM_DEV_TAG_AFTER_COUNT         0x20
145 #define CAM_DEV_INQUIRY_DATA_VALID      0x40
146         u_int32_t        tag_delay_count;
147 #define CAM_TAG_DELAY_COUNT             5
148         u_int32_t        refcount;
149         struct           callout_handle c_handle;
150 };
151
152 /*
153  * Each target is represented by an ET (Existing Target).  These
154  * entries are created when a target is successfully probed with an
155  * identify, and removed when a device fails to respond after a number
156  * of retries, or a bus rescan finds the device missing.
157  */
158 struct cam_et { 
159         TAILQ_HEAD(, cam_ed) ed_entries;
160         TAILQ_ENTRY(cam_et) links;
161         struct  cam_eb  *bus;   
162         target_id_t     target_id;
163         u_int32_t       refcount;       
164         u_int           generation;
165         struct          timeval last_reset;     /* uptime of last reset */
166 };
167
168 /*
169  * Each bus is represented by an EB (Existing Bus).  These entries
170  * are created by calls to xpt_bus_register and deleted by calls to
171  * xpt_bus_deregister.
172  */
173 struct cam_eb { 
174         TAILQ_HEAD(, cam_et) et_entries;
175         TAILQ_ENTRY(cam_eb)  links;
176         path_id_t            path_id;
177         struct cam_sim       *sim;
178         struct timeval       last_reset;        /* uptime of last reset */
179         u_int32_t            flags;
180 #define CAM_EB_RUNQ_SCHEDULED   0x01
181         u_int32_t            refcount;
182         u_int                generation;
183 };
184
185 struct cam_path {
186         struct cam_periph *periph;
187         struct cam_eb     *bus;
188         struct cam_et     *target;
189         struct cam_ed     *device;
190 };
191
192 struct xpt_quirk_entry {
193         struct scsi_inquiry_pattern inq_pat;
194         u_int8_t quirks;
195 #define CAM_QUIRK_NOLUNS        0x01
196 #define CAM_QUIRK_NOSERIAL      0x02
197 #define CAM_QUIRK_HILUNS        0x04
198         u_int mintags;
199         u_int maxtags;
200 };
201 #define CAM_SCSI2_MAXLUN        8
202
203 typedef enum {
204         XPT_FLAG_OPEN           = 0x01
205 } xpt_flags;
206
207 struct xpt_softc {
208         xpt_flags       flags;
209         u_int32_t       generation;
210 };
211
212 static const char quantum[] = "QUANTUM";
213 static const char sony[] = "SONY";
214 static const char west_digital[] = "WDIGTL";
215 static const char samsung[] = "SAMSUNG";
216 static const char seagate[] = "SEAGATE";
217 static const char microp[] = "MICROP";
218
219 static struct xpt_quirk_entry xpt_quirk_table[] = 
220 {
221         {
222                 /* Reports QUEUE FULL for temporary resource shortages */
223                 { T_DIRECT, SIP_MEDIA_FIXED, quantum, "XP39100*", "*" },
224                 /*quirks*/0, /*mintags*/24, /*maxtags*/32
225         },
226         {
227                 /* Reports QUEUE FULL for temporary resource shortages */
228                 { T_DIRECT, SIP_MEDIA_FIXED, quantum, "XP34550*", "*" },
229                 /*quirks*/0, /*mintags*/24, /*maxtags*/32
230         },
231         {
232                 /* Reports QUEUE FULL for temporary resource shortages */
233                 { T_DIRECT, SIP_MEDIA_FIXED, quantum, "XP32275*", "*" },
234                 /*quirks*/0, /*mintags*/24, /*maxtags*/32
235         },
236         {
237                 /* Broken tagged queuing drive */
238                 { T_DIRECT, SIP_MEDIA_FIXED, microp, "4421-07*", "*" },
239                 /*quirks*/0, /*mintags*/0, /*maxtags*/0
240         },
241         {
242                 /* Broken tagged queuing drive */
243                 { T_DIRECT, SIP_MEDIA_FIXED, "HP", "C372*", "*" },
244                 /*quirks*/0, /*mintags*/0, /*maxtags*/0
245         },
246         {
247                 /* Broken tagged queuing drive */
248                 { T_DIRECT, SIP_MEDIA_FIXED, microp, "3391*", "x43h" },
249                 /*quirks*/0, /*mintags*/0, /*maxtags*/0
250         },
251         {
252                 /*
253                  * Unfortunately, the Quantum Atlas III has the same
254                  * problem as the Atlas II drives above.
255                  * Reported by: "Johan Granlund" <johan@granlund.nu>
256                  *
257                  * For future reference, the drive with the problem was:
258                  * QUANTUM QM39100TD-SW N1B0
259                  * 
260                  * It's possible that Quantum will fix the problem in later
261                  * firmware revisions.  If that happens, the quirk entry
262                  * will need to be made specific to the firmware revisions
263                  * with the problem.
264                  * 
265                  */
266                 /* Reports QUEUE FULL for temporary resource shortages */
267                 { T_DIRECT, SIP_MEDIA_FIXED, quantum, "QM39100*", "*" },
268                 /*quirks*/0, /*mintags*/24, /*maxtags*/32
269         },
270         {
271                 /*
272                  * 18 Gig Atlas III, same problem as the 9G version.
273                  * Reported by: Andre Albsmeier
274                  *              <andre.albsmeier@mchp.siemens.de>
275                  *
276                  * For future reference, the drive with the problem was:
277                  * QUANTUM QM318000TD-S N491
278                  */
279                 /* Reports QUEUE FULL for temporary resource shortages */
280                 { T_DIRECT, SIP_MEDIA_FIXED, quantum, "QM318000*", "*" },
281                 /*quirks*/0, /*mintags*/24, /*maxtags*/32
282         },
283         {
284                 /*
285                  * Broken tagged queuing drive
286                  * Reported by: Bret Ford <bford@uop.cs.uop.edu>
287                  *         and: Martin Renters <martin@tdc.on.ca>
288                  */
289                 { T_DIRECT, SIP_MEDIA_FIXED, seagate, "ST410800*", "71*" },
290                 /*quirks*/0, /*mintags*/0, /*maxtags*/0
291         },
292                 /*
293                  * The Seagate Medalist Pro drives have very poor write
294                  * performance with anything more than 2 tags.
295                  * 
296                  * Reported by:  Paul van der Zwan <paulz@trantor.xs4all.nl>
297                  * Drive:  <SEAGATE ST36530N 1444>
298                  *
299                  * Reported by:  Jeremy Lea <reg@shale.csir.co.za>
300                  * Drive:  <SEAGATE ST34520W 1281>
301                  *
302                  * No one has actually reported that the 9G version
303                  * (ST39140*) of the Medalist Pro has the same problem, but
304                  * we're assuming that it does because the 4G and 6.5G
305                  * versions of the drive are broken.
306                  */
307         {
308                 { T_DIRECT, SIP_MEDIA_FIXED, seagate, "ST34520*", "*"},
309                 /*quirks*/0, /*mintags*/2, /*maxtags*/2
310         },
311         {
312                 { T_DIRECT, SIP_MEDIA_FIXED, seagate, "ST36530*", "*"},
313                 /*quirks*/0, /*mintags*/2, /*maxtags*/2
314         },
315         {
316                 { T_DIRECT, SIP_MEDIA_FIXED, seagate, "ST39140*", "*"},
317                 /*quirks*/0, /*mintags*/2, /*maxtags*/2
318         },
319         {
320                 /*
321                  * Slow when tagged queueing is enabled.  Write performance
322                  * steadily drops off with more and more concurrent
323                  * transactions.  Best sequential write performance with
324                  * tagged queueing turned off and write caching turned on.
325                  *
326                  * PR:  kern/10398
327                  * Submitted by:  Hideaki Okada <hokada@isl.melco.co.jp>
328                  * Drive:  DCAS-34330 w/ "S65A" firmware.
329                  *
330                  * The drive with the problem had the "S65A" firmware
331                  * revision, and has also been reported (by Stephen J.
332                  * Roznowski <sjr@home.net>) for a drive with the "S61A"
333                  * firmware revision.
334                  *
335                  * Although no one has reported problems with the 2 gig
336                  * version of the DCAS drive, the assumption is that it
337                  * has the same problems as the 4 gig version.  Therefore
338                  * this quirk entries disables tagged queueing for all
339                  * DCAS drives.
340                  */
341                 { T_DIRECT, SIP_MEDIA_FIXED, "IBM", "DCAS*", "*" },
342                 /*quirks*/0, /*mintags*/0, /*maxtags*/0
343         },
344         {
345                 /* Broken tagged queuing drive */
346                 { T_DIRECT, SIP_MEDIA_REMOVABLE, "iomega", "jaz*", "*" },
347                 /*quirks*/0, /*mintags*/0, /*maxtags*/0
348         },
349         {
350                 /* Broken tagged queuing drive */ 
351                 { T_DIRECT, SIP_MEDIA_FIXED, "CONNER", "CFP2107*", "*" },
352                 /*quirks*/0, /*mintags*/0, /*maxtags*/0
353         },
354         {
355                 /*
356                  * Broken tagged queuing drive.
357                  * Submitted by:
358                  * NAKAJI Hiroyuki <nakaji@zeisei.dpri.kyoto-u.ac.jp>
359                  * in PR kern/9535
360                  */
361                 { T_DIRECT, SIP_MEDIA_FIXED, samsung, "WN34324U*", "*" },
362                 /*quirks*/0, /*mintags*/0, /*maxtags*/0
363         },
364         {
365                 /*
366                  * Slow when tagged queueing is enabled. (1.5MB/sec versus
367                  * 8MB/sec.)
368                  * Submitted by: Andrew Gallatin <gallatin@cs.duke.edu>
369                  * Best performance with these drives is achieved with
370                  * tagged queueing turned off, and write caching turned on.
371                  */
372                 { T_DIRECT, SIP_MEDIA_FIXED, west_digital, "WDE*", "*" },
373                 /*quirks*/0, /*mintags*/0, /*maxtags*/0
374         },
375         {
376                 /*
377                  * Slow when tagged queueing is enabled. (1.5MB/sec versus
378                  * 8MB/sec.)
379                  * Submitted by: Andrew Gallatin <gallatin@cs.duke.edu>
380                  * Best performance with these drives is achieved with
381                  * tagged queueing turned off, and write caching turned on.
382                  */
383                 { T_DIRECT, SIP_MEDIA_FIXED, west_digital, "ENTERPRISE", "*" },
384                 /*quirks*/0, /*mintags*/0, /*maxtags*/0
385         },
386         {
387                 /*
388                  * Doesn't handle queue full condition correctly,
389                  * so we need to limit maxtags to what the device
390                  * can handle instead of determining this automatically.
391                  */
392                 { T_DIRECT, SIP_MEDIA_FIXED, samsung, "WN321010S*", "*" },
393                 /*quirks*/0, /*mintags*/2, /*maxtags*/32
394         },
395         {
396                 /* Really only one LUN */
397                 { T_ENCLOSURE, SIP_MEDIA_FIXED, "SUN", "SENA", "*" },
398                 CAM_QUIRK_NOLUNS, /*mintags*/0, /*maxtags*/0
399         },
400         {
401                 /* I can't believe we need a quirk for DPT volumes. */
402                 { T_ANY, SIP_MEDIA_FIXED|SIP_MEDIA_REMOVABLE, "DPT", "*", "*" },
403                 CAM_QUIRK_NOSERIAL|CAM_QUIRK_NOLUNS,
404                 /*mintags*/0, /*maxtags*/255
405         },
406         {
407                 /*
408                  * Many Sony CDROM drives don't like multi-LUN probing.
409                  */
410                 { T_CDROM, SIP_MEDIA_REMOVABLE, sony, "CD-ROM CDU*", "*" },
411                 CAM_QUIRK_NOLUNS, /*mintags*/0, /*maxtags*/0
412         },
413         {
414                 /*
415                  * This drive doesn't like multiple LUN probing.
416                  * Submitted by:  Parag Patel <parag@cgt.com>
417                  */
418                 { T_WORM, SIP_MEDIA_REMOVABLE, sony, "CD-R   CDU9*", "*" },
419                 CAM_QUIRK_NOLUNS, /*mintags*/0, /*maxtags*/0
420         },
421         {
422                 { T_WORM, SIP_MEDIA_REMOVABLE, "YAMAHA", "CDR100*", "*" },
423                 CAM_QUIRK_NOLUNS, /*mintags*/0, /*maxtags*/0
424         },
425         {
426                 /*
427                  * The 8200 doesn't like multi-lun probing, and probably
428                  * don't like serial number requests either.
429                  */
430                 {
431                         T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "EXABYTE",
432                         "EXB-8200*", "*"
433                 },
434                 CAM_QUIRK_NOSERIAL|CAM_QUIRK_NOLUNS, /*mintags*/0, /*maxtags*/0
435         },
436         {
437                 /*
438                  * Let's try the same as above, but for a drive that says
439                  * it's an IPL-6860 but is actually an EXB 8200.
440                  */
441                 {
442                         T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "EXABYTE",
443                         "IPL-6860*", "*"
444                 },
445                 CAM_QUIRK_NOSERIAL|CAM_QUIRK_NOLUNS, /*mintags*/0, /*maxtags*/0
446         },
447         {
448                 /*
449                  * These Hitachi drives don't like multi-lun probing.
450                  * The PR submitter has a DK319H, but says that the Linux
451                  * kernel has a similar work-around for the DK312 and DK314,
452                  * so all DK31* drives are quirked here.
453                  * PR:            misc/18793
454                  * Submitted by:  Paul Haddad <paul@pth.com>
455                  */
456                 { T_DIRECT, SIP_MEDIA_FIXED, "HITACHI", "DK31*", "*" },
457                 CAM_QUIRK_NOLUNS, /*mintags*/2, /*maxtags*/255
458         },
459         {
460                 /*
461                  * This old revision of the TDC3600 is also SCSI-1, and
462                  * hangs upon serial number probing.
463                  */
464                 {
465                         T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "TANDBERG",
466                         " TDC 3600", "U07:"
467                 },
468                 CAM_QUIRK_NOSERIAL, /*mintags*/0, /*maxtags*/0
469         },
470         {
471                 /*
472                  * Would repond to all LUNs if asked for.
473                  */
474                 {
475                         T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "CALIPER",
476                         "CP150", "*"
477                 },
478                 CAM_QUIRK_NOLUNS, /*mintags*/0, /*maxtags*/0
479         },
480         {
481                 /*
482                  * Would repond to all LUNs if asked for.
483                  */
484                 {
485                         T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "KENNEDY",
486                         "96X2*", "*"
487                 },
488                 CAM_QUIRK_NOLUNS, /*mintags*/0, /*maxtags*/0
489         },
490         {
491                 /* Submitted by: Matthew Dodd <winter@jurai.net> */
492                 { T_PROCESSOR, SIP_MEDIA_FIXED, "Cabletrn", "EA41*", "*" },
493                 CAM_QUIRK_NOLUNS, /*mintags*/0, /*maxtags*/0
494         },
495         {
496                 /* Submitted by: Matthew Dodd <winter@jurai.net> */
497                 { T_PROCESSOR, SIP_MEDIA_FIXED, "CABLETRN", "EA41*", "*" },
498                 CAM_QUIRK_NOLUNS, /*mintags*/0, /*maxtags*/0
499         },
500         {
501                 /* TeraSolutions special settings for TRC-22 RAID */
502                 { T_DIRECT, SIP_MEDIA_FIXED, "TERASOLU", "TRC-22", "*" },
503                   /*quirks*/0, /*mintags*/55, /*maxtags*/255
504         },
505         {
506                 /* Veritas Storage Appliance */
507                 { T_DIRECT, SIP_MEDIA_FIXED, "VERITAS", "*", "*" },
508                   CAM_QUIRK_HILUNS, /*mintags*/2, /*maxtags*/1024
509         },
510         {
511                 /*
512                  * Would respond to all LUNs.  Device type and removable
513                  * flag are jumper-selectable.
514                  */
515                 { T_ANY, SIP_MEDIA_REMOVABLE|SIP_MEDIA_FIXED, "MaxOptix",
516                   "Tahiti 1", "*"
517                 },
518                 CAM_QUIRK_NOLUNS, /*mintags*/0, /*maxtags*/0
519         },
520         {
521                 /* Default tagged queuing parameters for all devices */
522                 {
523                   T_ANY, SIP_MEDIA_REMOVABLE|SIP_MEDIA_FIXED,
524                   /*vendor*/"*", /*product*/"*", /*revision*/"*"
525                 },
526                 /*quirks*/0, /*mintags*/2, /*maxtags*/255
527         },
528 };
529
530 static const int xpt_quirk_table_size =
531         sizeof(xpt_quirk_table) / sizeof(*xpt_quirk_table);
532
533 typedef enum {
534         DM_RET_COPY             = 0x01,
535         DM_RET_FLAG_MASK        = 0x0f,
536         DM_RET_NONE             = 0x00,
537         DM_RET_STOP             = 0x10,
538         DM_RET_DESCEND          = 0x20,
539         DM_RET_ERROR            = 0x30,
540         DM_RET_ACTION_MASK      = 0xf0
541 } dev_match_ret;
542
543 typedef enum {
544         XPT_DEPTH_BUS,
545         XPT_DEPTH_TARGET,
546         XPT_DEPTH_DEVICE,
547         XPT_DEPTH_PERIPH
548 } xpt_traverse_depth;
549
550 struct xpt_traverse_config {
551         xpt_traverse_depth      depth;
552         void                    *tr_func;
553         void                    *tr_arg;
554 };
555
556 typedef int     xpt_busfunc_t (struct cam_eb *bus, void *arg);
557 typedef int     xpt_targetfunc_t (struct cam_et *target, void *arg);
558 typedef int     xpt_devicefunc_t (struct cam_ed *device, void *arg);
559 typedef int     xpt_periphfunc_t (struct cam_periph *periph, void *arg);
560 typedef int     xpt_pdrvfunc_t (struct periph_driver **pdrv, void *arg);
561
562 /* Transport layer configuration information */
563 static struct xpt_softc xsoftc;
564
565 /* Queues for our software interrupt handler */
566 typedef TAILQ_HEAD(cam_isrq, ccb_hdr) cam_isrq_t;
567 static cam_isrq_t cam_bioq;
568 static cam_isrq_t cam_netq;
569
570 /* "Pool" of inactive ccbs managed by xpt_alloc_ccb and xpt_free_ccb */
571 static SLIST_HEAD(,ccb_hdr) ccb_freeq;
572 static u_int xpt_max_ccbs;      /*
573                                  * Maximum size of ccb pool.  Modified as
574                                  * devices are added/removed or have their
575                                  * opening counts changed.
576                                  */
577 static u_int xpt_ccb_count;     /* Current count of allocated ccbs */
578
579 struct cam_periph *xpt_periph;
580
581 static periph_init_t xpt_periph_init;
582
583 static periph_init_t probe_periph_init;
584
585 static struct periph_driver xpt_driver =
586 {
587         xpt_periph_init, "xpt",
588         TAILQ_HEAD_INITIALIZER(xpt_driver.units)
589 };
590
591 static struct periph_driver probe_driver =
592 {
593         probe_periph_init, "probe",
594         TAILQ_HEAD_INITIALIZER(probe_driver.units)
595 };
596
597 DATA_SET(periphdriver_set, xpt_driver);
598 DATA_SET(periphdriver_set, probe_driver);
599
600 #define XPT_CDEV_MAJOR 104
601
602 static d_open_t xptopen;
603 static d_close_t xptclose;
604 static d_ioctl_t xptioctl;
605
606 static struct cdevsw xpt_cdevsw = {
607         /* name */      "xpt",
608         /* maj */       XPT_CDEV_MAJOR,
609         /* flags */     0,
610         /* port */      NULL,
611         /* autoq */     0,
612
613         /* open */      xptopen,
614         /* close */     xptclose,
615         /* read */      noread,
616         /* write */     nowrite,
617         /* ioctl */     xptioctl,
618         /* poll */      nopoll,
619         /* mmap */      nommap,
620         /* strategy */  nostrategy,
621         /* dump */      nodump,
622         /* psize */     nopsize
623 };
624
625 static struct intr_config_hook *xpt_config_hook;
626
627 /* Registered busses */
628 static TAILQ_HEAD(,cam_eb) xpt_busses;
629 static u_int bus_generation;
630
631 /* Storage for debugging datastructures */
632 #ifdef  CAMDEBUG
633 struct cam_path *cam_dpath;
634 u_int32_t cam_dflags;
635 u_int32_t cam_debug_delay;
636 #endif
637
638 #if defined(CAM_DEBUG_FLAGS) && !defined(CAMDEBUG)
639 #error "You must have options CAMDEBUG to use options CAM_DEBUG_FLAGS"
640 #endif
641
642 /*
643  * In order to enable the CAM_DEBUG_* options, the user must have CAMDEBUG
644  * enabled.  Also, the user must have either none, or all of CAM_DEBUG_BUS,
645  * CAM_DEBUG_TARGET, and CAM_DEBUG_LUN specified.
646  */
647 #if defined(CAM_DEBUG_BUS) || defined(CAM_DEBUG_TARGET) \
648     || defined(CAM_DEBUG_LUN)
649 #ifdef CAMDEBUG
650 #if !defined(CAM_DEBUG_BUS) || !defined(CAM_DEBUG_TARGET) \
651     || !defined(CAM_DEBUG_LUN)
652 #error "You must define all or none of CAM_DEBUG_BUS, CAM_DEBUG_TARGET \
653         and CAM_DEBUG_LUN"
654 #endif /* !CAM_DEBUG_BUS || !CAM_DEBUG_TARGET || !CAM_DEBUG_LUN */
655 #else /* !CAMDEBUG */
656 #error "You must use options CAMDEBUG if you use the CAM_DEBUG_* options"
657 #endif /* CAMDEBUG */
658 #endif /* CAM_DEBUG_BUS || CAM_DEBUG_TARGET || CAM_DEBUG_LUN */
659
660 /* Our boot-time initialization hook */
661 static void     xpt_init(void *);
662 SYSINIT(cam, SI_SUB_CONFIGURE, SI_ORDER_SECOND, xpt_init, NULL);
663
664 static cam_status       xpt_compile_path(struct cam_path *new_path,
665                                          struct cam_periph *perph,
666                                          path_id_t path_id,
667                                          target_id_t target_id,
668                                          lun_id_t lun_id);
669
670 static void             xpt_release_path(struct cam_path *path);
671
672 static void             xpt_async_bcast(struct async_list *async_head,
673                                         u_int32_t async_code,
674                                         struct cam_path *path,
675                                         void *async_arg);
676 static void             xpt_dev_async(u_int32_t async_code,
677                                       struct cam_eb *bus,
678                                       struct cam_et *target,
679                                       struct cam_ed *device,
680                                       void *async_arg);
681 static path_id_t xptnextfreepathid(void);
682 static path_id_t xptpathid(const char *sim_name, int sim_unit, int sim_bus);
683 static union ccb *xpt_get_ccb(struct cam_ed *device);
684 static int       xpt_schedule_dev(struct camq *queue, cam_pinfo *dev_pinfo,
685                                   u_int32_t new_priority);
686 static void      xpt_run_dev_allocq(struct cam_eb *bus);
687 static void      xpt_run_dev_sendq(struct cam_eb *bus);
688 static timeout_t xpt_release_devq_timeout;
689 static timeout_t xpt_release_simq_timeout;
690 static void      xpt_release_bus(struct cam_eb *bus);
691 static void      xpt_release_devq_device(struct cam_ed *dev, u_int count,
692                                          int run_queue);
693 static struct cam_et*
694                  xpt_alloc_target(struct cam_eb *bus, target_id_t target_id);
695 static void      xpt_release_target(struct cam_eb *bus, struct cam_et *target);
696 static struct cam_ed*
697                  xpt_alloc_device(struct cam_eb *bus, struct cam_et *target,
698                                   lun_id_t lun_id);
699 static void      xpt_release_device(struct cam_eb *bus, struct cam_et *target,
700                                     struct cam_ed *device);
701 static u_int32_t xpt_dev_ccbq_resize(struct cam_path *path, int newopenings);
702 static struct cam_eb*
703                  xpt_find_bus(path_id_t path_id);
704 static struct cam_et*
705                  xpt_find_target(struct cam_eb *bus, target_id_t target_id);
706 static struct cam_ed*
707                  xpt_find_device(struct cam_et *target, lun_id_t lun_id);
708 static void      xpt_scan_bus(struct cam_periph *periph, union ccb *ccb);
709 static void      xpt_scan_lun(struct cam_periph *periph,
710                               struct cam_path *path, cam_flags flags,
711                               union ccb *ccb);
712 static void      xptscandone(struct cam_periph *periph, union ccb *done_ccb);
713 static xpt_busfunc_t    xptconfigbuscountfunc;
714 static xpt_busfunc_t    xptconfigfunc;
715 static void      xpt_config(void *arg);
716 static xpt_devicefunc_t xptpassannouncefunc;
717 static void      xpt_finishconfig(struct cam_periph *periph, union ccb *ccb);
718 static void      xptaction(struct cam_sim *sim, union ccb *work_ccb);
719 static void      xptpoll(struct cam_sim *sim);
720 static inthand2_t swi_camnet;
721 static inthand2_t swi_cambio;
722 static void      camisr(cam_isrq_t *queue);
723 #if 0
724 static void      xptstart(struct cam_periph *periph, union ccb *work_ccb);
725 static void      xptasync(struct cam_periph *periph,
726                           u_int32_t code, cam_path *path);
727 #endif
728 static dev_match_ret    xptbusmatch(struct dev_match_pattern *patterns,
729                                     int num_patterns, struct cam_eb *bus);
730 static dev_match_ret    xptdevicematch(struct dev_match_pattern *patterns,
731                                        int num_patterns, struct cam_ed *device);
732 static dev_match_ret    xptperiphmatch(struct dev_match_pattern *patterns,
733                                        int num_patterns,
734                                        struct cam_periph *periph);
735 static xpt_busfunc_t    xptedtbusfunc;
736 static xpt_targetfunc_t xptedttargetfunc;
737 static xpt_devicefunc_t xptedtdevicefunc;
738 static xpt_periphfunc_t xptedtperiphfunc;
739 static xpt_pdrvfunc_t   xptplistpdrvfunc;
740 static xpt_periphfunc_t xptplistperiphfunc;
741 static int              xptedtmatch(struct ccb_dev_match *cdm);
742 static int              xptperiphlistmatch(struct ccb_dev_match *cdm);
743 static int              xptbustraverse(struct cam_eb *start_bus,
744                                        xpt_busfunc_t *tr_func, void *arg);
745 static int              xpttargettraverse(struct cam_eb *bus,
746                                           struct cam_et *start_target,
747                                           xpt_targetfunc_t *tr_func, void *arg);
748 static int              xptdevicetraverse(struct cam_et *target,
749                                           struct cam_ed *start_device,
750                                           xpt_devicefunc_t *tr_func, void *arg);
751 static int              xptperiphtraverse(struct cam_ed *device,
752                                           struct cam_periph *start_periph,
753                                           xpt_periphfunc_t *tr_func, void *arg);
754 static int              xptpdrvtraverse(struct periph_driver **start_pdrv,
755                                         xpt_pdrvfunc_t *tr_func, void *arg);
756 static int              xptpdperiphtraverse(struct periph_driver **pdrv,
757                                             struct cam_periph *start_periph,
758                                             xpt_periphfunc_t *tr_func,
759                                             void *arg);
760 static xpt_busfunc_t    xptdefbusfunc;
761 static xpt_targetfunc_t xptdeftargetfunc;
762 static xpt_devicefunc_t xptdefdevicefunc;
763 static xpt_periphfunc_t xptdefperiphfunc;
764 static int              xpt_for_all_busses(xpt_busfunc_t *tr_func, void *arg);
765 #ifdef notusedyet
766 static int              xpt_for_all_targets(xpt_targetfunc_t *tr_func,
767                                             void *arg);
768 #endif
769 static int              xpt_for_all_devices(xpt_devicefunc_t *tr_func,
770                                             void *arg);
771 #ifdef notusedyet
772 static int              xpt_for_all_periphs(xpt_periphfunc_t *tr_func,
773                                             void *arg);
774 #endif
775 static xpt_devicefunc_t xptsetasyncfunc;
776 static xpt_busfunc_t    xptsetasyncbusfunc;
777 static cam_status       xptregister(struct cam_periph *periph,
778                                     void *arg);
779 static cam_status       proberegister(struct cam_periph *periph,
780                                       void *arg);
781 static void      probeschedule(struct cam_periph *probe_periph);
782 static void      probestart(struct cam_periph *periph, union ccb *start_ccb);
783 static void      proberequestdefaultnegotiation(struct cam_periph *periph);
784 static void      probedone(struct cam_periph *periph, union ccb *done_ccb);
785 static void      probecleanup(struct cam_periph *periph);
786 static void      xpt_find_quirk(struct cam_ed *device);
787 static void      xpt_set_transfer_settings(struct ccb_trans_settings *cts,
788                                            struct cam_ed *device,
789                                            int async_update);
790 static void      xpt_toggle_tags(struct cam_path *path);
791 static void      xpt_start_tags(struct cam_path *path);
792 static __inline int xpt_schedule_dev_allocq(struct cam_eb *bus,
793                                             struct cam_ed *dev);
794 static __inline int xpt_schedule_dev_sendq(struct cam_eb *bus,
795                                            struct cam_ed *dev);
796 static __inline int periph_is_queued(struct cam_periph *periph);
797 static __inline int device_is_alloc_queued(struct cam_ed *device);
798 static __inline int device_is_send_queued(struct cam_ed *device);
799 static __inline int dev_allocq_is_runnable(struct cam_devq *devq);
800
801 static __inline int
802 xpt_schedule_dev_allocq(struct cam_eb *bus, struct cam_ed *dev)
803 {
804         int retval;
805
806         if (dev->ccbq.devq_openings > 0) {
807                 if ((dev->flags & CAM_DEV_RESIZE_QUEUE_NEEDED) != 0) {
808                         cam_ccbq_resize(&dev->ccbq,
809                                         dev->ccbq.dev_openings
810                                         + dev->ccbq.dev_active);
811                         dev->flags &= ~CAM_DEV_RESIZE_QUEUE_NEEDED;
812                 }
813                 /*
814                  * The priority of a device waiting for CCB resources
815                  * is that of the the highest priority peripheral driver
816                  * enqueued.
817                  */
818                 retval = xpt_schedule_dev(&bus->sim->devq->alloc_queue,
819                                           &dev->alloc_ccb_entry.pinfo,
820                                           CAMQ_GET_HEAD(&dev->drvq)->priority); 
821         } else {
822                 retval = 0;
823         }
824
825         return (retval);
826 }
827
828 static __inline int
829 xpt_schedule_dev_sendq(struct cam_eb *bus, struct cam_ed *dev)
830 {
831         int     retval;
832
833         if (dev->ccbq.dev_openings > 0) {
834                 /*
835                  * The priority of a device waiting for controller
836                  * resources is that of the the highest priority CCB
837                  * enqueued.
838                  */
839                 retval =
840                     xpt_schedule_dev(&bus->sim->devq->send_queue,
841                                      &dev->send_ccb_entry.pinfo,
842                                      CAMQ_GET_HEAD(&dev->ccbq.queue)->priority);
843         } else {
844                 retval = 0;
845         }
846         return (retval);
847 }
848
849 static __inline int
850 periph_is_queued(struct cam_periph *periph)
851 {
852         return (periph->pinfo.index != CAM_UNQUEUED_INDEX);
853 }
854
855 static __inline int
856 device_is_alloc_queued(struct cam_ed *device)
857 {
858         return (device->alloc_ccb_entry.pinfo.index != CAM_UNQUEUED_INDEX);
859 }
860
861 static __inline int
862 device_is_send_queued(struct cam_ed *device)
863 {
864         return (device->send_ccb_entry.pinfo.index != CAM_UNQUEUED_INDEX);
865 }
866
867 static __inline int
868 dev_allocq_is_runnable(struct cam_devq *devq)
869 {
870         /*
871          * Have work to do.
872          * Have space to do more work.
873          * Allowed to do work.
874          */
875         return ((devq->alloc_queue.qfrozen_cnt == 0)
876              && (devq->alloc_queue.entries > 0)
877              && (devq->alloc_openings > 0));
878 }
879
880 static void
881 xpt_periph_init()
882 {
883         make_dev(&xpt_cdevsw, 0, UID_ROOT, GID_OPERATOR, 0600, "xpt0");
884 }
885
886 static void
887 probe_periph_init()
888 {
889 }
890
891
892 static void
893 xptdone(struct cam_periph *periph, union ccb *done_ccb)
894 {
895         /* Caller will release the CCB */
896         wakeup(&done_ccb->ccb_h.cbfcnp);
897 }
898
899 static int
900 xptopen(dev_t dev, int flags, int fmt, struct thread *td)
901 {
902         int unit;
903
904         unit = minor(dev) & 0xff;
905
906         /*
907          * Only allow read-write access.
908          */
909         if (((flags & FWRITE) == 0) || ((flags & FREAD) == 0))
910                 return(EPERM);
911
912         /*
913          * We don't allow nonblocking access.
914          */
915         if ((flags & O_NONBLOCK) != 0) {
916                 printf("xpt%d: can't do nonblocking access\n", unit);
917                 return(ENODEV);
918         }
919
920         /*
921          * We only have one transport layer right now.  If someone accesses
922          * us via something other than minor number 1, point out their
923          * mistake.
924          */
925         if (unit != 0) {
926                 printf("xptopen: got invalid xpt unit %d\n", unit);
927                 return(ENXIO);
928         }
929
930         /* Mark ourselves open */
931         xsoftc.flags |= XPT_FLAG_OPEN;
932         
933         return(0);
934 }
935
936 static int
937 xptclose(dev_t dev, int flag, int fmt, struct thread *td)
938 {
939         int unit;
940
941         unit = minor(dev) & 0xff;
942
943         /*
944          * We only have one transport layer right now.  If someone accesses
945          * us via something other than minor number 1, point out their
946          * mistake.
947          */
948         if (unit != 0) {
949                 printf("xptclose: got invalid xpt unit %d\n", unit);
950                 return(ENXIO);
951         }
952
953         /* Mark ourselves closed */
954         xsoftc.flags &= ~XPT_FLAG_OPEN;
955
956         return(0);
957 }
958
959 static int
960 xptioctl(dev_t dev, u_long cmd, caddr_t addr, int flag, struct thread *td)
961 {
962         int unit, error;
963
964         error = 0;
965         unit = minor(dev) & 0xff;
966
967         /*
968          * We only have one transport layer right now.  If someone accesses
969          * us via something other than minor number 1, point out their
970          * mistake.
971          */
972         if (unit != 0) {
973                 printf("xptioctl: got invalid xpt unit %d\n", unit);
974                 return(ENXIO);
975         }
976
977         switch(cmd) {
978         /*
979          * For the transport layer CAMIOCOMMAND ioctl, we really only want
980          * to accept CCB types that don't quite make sense to send through a
981          * passthrough driver.
982          */
983         case CAMIOCOMMAND: {
984                 union ccb *ccb;
985                 union ccb *inccb;
986
987                 inccb = (union ccb *)addr;
988
989                 switch(inccb->ccb_h.func_code) {
990                 case XPT_SCAN_BUS:
991                 case XPT_RESET_BUS:
992                         if ((inccb->ccb_h.target_id != CAM_TARGET_WILDCARD)
993                          || (inccb->ccb_h.target_lun != CAM_LUN_WILDCARD)) {
994                                 error = EINVAL;
995                                 break;
996                         }
997                         /* FALLTHROUGH */
998                 case XPT_PATH_INQ:
999                 case XPT_ENG_INQ:
1000                 case XPT_SCAN_LUN:
1001
1002                         ccb = xpt_alloc_ccb();
1003
1004                         /*
1005                          * Create a path using the bus, target, and lun the
1006                          * user passed in.
1007                          */
1008                         if (xpt_create_path(&ccb->ccb_h.path, xpt_periph,
1009                                             inccb->ccb_h.path_id,
1010                                             inccb->ccb_h.target_id,
1011                                             inccb->ccb_h.target_lun) !=
1012                                             CAM_REQ_CMP){
1013                                 error = EINVAL;
1014                                 xpt_free_ccb(ccb);
1015                                 break;
1016                         }
1017                         /* Ensure all of our fields are correct */
1018                         xpt_setup_ccb(&ccb->ccb_h, ccb->ccb_h.path,
1019                                       inccb->ccb_h.pinfo.priority);
1020                         xpt_merge_ccb(ccb, inccb);
1021                         ccb->ccb_h.cbfcnp = xptdone;
1022                         cam_periph_runccb(ccb, NULL, 0, 0, NULL);
1023                         bcopy(ccb, inccb, sizeof(union ccb));
1024                         xpt_free_path(ccb->ccb_h.path);
1025                         xpt_free_ccb(ccb);
1026                         break;
1027
1028                 case XPT_DEBUG: {
1029                         union ccb ccb;
1030
1031                         /*
1032                          * This is an immediate CCB, so it's okay to
1033                          * allocate it on the stack.
1034                          */
1035
1036                         /*
1037                          * Create a path using the bus, target, and lun the
1038                          * user passed in.
1039                          */
1040                         if (xpt_create_path(&ccb.ccb_h.path, xpt_periph,
1041                                             inccb->ccb_h.path_id,
1042                                             inccb->ccb_h.target_id,
1043                                             inccb->ccb_h.target_lun) !=
1044                                             CAM_REQ_CMP){
1045                                 error = EINVAL;
1046                                 break;
1047                         }
1048                         /* Ensure all of our fields are correct */
1049                         xpt_setup_ccb(&ccb.ccb_h, ccb.ccb_h.path,
1050                                       inccb->ccb_h.pinfo.priority);
1051                         xpt_merge_ccb(&ccb, inccb);
1052                         ccb.ccb_h.cbfcnp = xptdone;
1053                         xpt_action(&ccb);
1054                         bcopy(&ccb, inccb, sizeof(union ccb));
1055                         xpt_free_path(ccb.ccb_h.path);
1056                         break;
1057
1058                 }
1059                 case XPT_DEV_MATCH: {
1060                         struct cam_periph_map_info mapinfo;
1061                         struct cam_path *old_path;
1062
1063                         /*
1064                          * We can't deal with physical addresses for this
1065                          * type of transaction.
1066                          */
1067                         if (inccb->ccb_h.flags & CAM_DATA_PHYS) {
1068                                 error = EINVAL;
1069                                 break;
1070                         }
1071
1072                         /*
1073                          * Save this in case the caller had it set to
1074                          * something in particular.
1075                          */
1076                         old_path = inccb->ccb_h.path;
1077
1078                         /*
1079                          * We really don't need a path for the matching
1080                          * code.  The path is needed because of the
1081                          * debugging statements in xpt_action().  They
1082                          * assume that the CCB has a valid path.
1083                          */
1084                         inccb->ccb_h.path = xpt_periph->path;
1085
1086                         bzero(&mapinfo, sizeof(mapinfo));
1087
1088                         /*
1089                          * Map the pattern and match buffers into kernel
1090                          * virtual address space.
1091                          */
1092                         error = cam_periph_mapmem(inccb, &mapinfo);
1093
1094                         if (error) {
1095                                 inccb->ccb_h.path = old_path;
1096                                 break;
1097                         }
1098
1099                         /*
1100                          * This is an immediate CCB, we can send it on directly.
1101                          */
1102                         xpt_action(inccb);
1103
1104                         /*
1105                          * Map the buffers back into user space.
1106                          */
1107                         cam_periph_unmapmem(inccb, &mapinfo);
1108
1109                         inccb->ccb_h.path = old_path;
1110
1111                         error = 0;
1112                         break;
1113                 }
1114                 default:
1115                         error = ENOTSUP;
1116                         break;
1117                 }
1118                 break;
1119         }
1120         /*
1121          * This is the getpassthru ioctl. It takes a XPT_GDEVLIST ccb as input,
1122          * with the periphal driver name and unit name filled in.  The other
1123          * fields don't really matter as input.  The passthrough driver name
1124          * ("pass"), and unit number are passed back in the ccb.  The current
1125          * device generation number, and the index into the device peripheral
1126          * driver list, and the status are also passed back.  Note that
1127          * since we do everything in one pass, unlike the XPT_GDEVLIST ccb,
1128          * we never return a status of CAM_GDEVLIST_LIST_CHANGED.  It is
1129          * (or rather should be) impossible for the device peripheral driver
1130          * list to change since we look at the whole thing in one pass, and
1131          * we do it with splcam protection.
1132          * 
1133          */
1134         case CAMGETPASSTHRU: {
1135                 union ccb *ccb;
1136                 struct cam_periph *periph;
1137                 struct periph_driver **p_drv;
1138                 char   *name;
1139                 int unit;
1140                 int cur_generation;
1141                 int base_periph_found;
1142                 int splbreaknum;
1143                 int s;
1144
1145                 ccb = (union ccb *)addr;
1146                 unit = ccb->cgdl.unit_number;
1147                 name = ccb->cgdl.periph_name;
1148                 /*
1149                  * Every 100 devices, we want to drop our spl protection to
1150                  * give the software interrupt handler a chance to run.
1151                  * Most systems won't run into this check, but this should
1152                  * avoid starvation in the software interrupt handler in
1153                  * large systems.
1154                  */
1155                 splbreaknum = 100;
1156
1157                 ccb = (union ccb *)addr;
1158
1159                 base_periph_found = 0;
1160
1161                 /*
1162                  * Sanity check -- make sure we don't get a null peripheral
1163                  * driver name.
1164                  */
1165                 if (*ccb->cgdl.periph_name == '\0') {
1166                         error = EINVAL;
1167                         break;
1168                 }
1169
1170                 /* Keep the list from changing while we traverse it */
1171                 s = splcam();
1172 ptstartover:
1173                 cur_generation = xsoftc.generation;
1174
1175                 /* first find our driver in the list of drivers */
1176                 SET_FOREACH(p_drv, periphdriver_set) {
1177                         if (strcmp((*p_drv)->driver_name, name) == 0)
1178                                 break;
1179                 }
1180
1181                 if (*p_drv == NULL) {
1182                         splx(s);
1183                         ccb->ccb_h.status = CAM_REQ_CMP_ERR;
1184                         ccb->cgdl.status = CAM_GDEVLIST_ERROR;
1185                         *ccb->cgdl.periph_name = '\0';
1186                         ccb->cgdl.unit_number = 0;
1187                         error = ENOENT;
1188                         break;
1189                 }       
1190
1191                 /*
1192                  * Run through every peripheral instance of this driver
1193                  * and check to see whether it matches the unit passed
1194                  * in by the user.  If it does, get out of the loops and
1195                  * find the passthrough driver associated with that
1196                  * peripheral driver.
1197                  */
1198                 for (periph = TAILQ_FIRST(&(*p_drv)->units); periph != NULL;
1199                      periph = TAILQ_NEXT(periph, unit_links)) {
1200
1201                         if (periph->unit_number == unit) {
1202                                 break;
1203                         } else if (--splbreaknum == 0) {
1204                                 splx(s);
1205                                 s = splcam();
1206                                 splbreaknum = 100;
1207                                 if (cur_generation != xsoftc.generation)
1208                                        goto ptstartover;
1209                         }
1210                 }
1211                 /*
1212                  * If we found the peripheral driver that the user passed
1213                  * in, go through all of the peripheral drivers for that
1214                  * particular device and look for a passthrough driver.
1215                  */
1216                 if (periph != NULL) {
1217                         struct cam_ed *device;
1218                         int i;
1219
1220                         base_periph_found = 1;
1221                         device = periph->path->device;
1222                         for (i = 0, periph = device->periphs.slh_first;
1223                              periph != NULL;
1224                              periph = periph->periph_links.sle_next, i++) {
1225                                 /*
1226                                  * Check to see whether we have a
1227                                  * passthrough device or not. 
1228                                  */
1229                                 if (strcmp(periph->periph_name, "pass") == 0) {
1230                                         /*
1231                                          * Fill in the getdevlist fields.
1232                                          */
1233                                         strcpy(ccb->cgdl.periph_name,
1234                                                periph->periph_name);
1235                                         ccb->cgdl.unit_number =
1236                                                 periph->unit_number;
1237                                         if (periph->periph_links.sle_next)
1238                                                 ccb->cgdl.status =
1239                                                         CAM_GDEVLIST_MORE_DEVS;
1240                                         else
1241                                                 ccb->cgdl.status =
1242                                                        CAM_GDEVLIST_LAST_DEVICE;
1243                                         ccb->cgdl.generation =
1244                                                 device->generation;
1245                                         ccb->cgdl.index = i;
1246                                         /*
1247                                          * Fill in some CCB header fields
1248                                          * that the user may want.
1249                                          */
1250                                         ccb->ccb_h.path_id =
1251                                                 periph->path->bus->path_id;
1252                                         ccb->ccb_h.target_id =
1253                                                 periph->path->target->target_id;
1254                                         ccb->ccb_h.target_lun =
1255                                                 periph->path->device->lun_id;
1256                                         ccb->ccb_h.status = CAM_REQ_CMP;
1257                                         break;
1258                                 }
1259                         }
1260                 }
1261
1262                 /*
1263                  * If the periph is null here, one of two things has
1264                  * happened.  The first possibility is that we couldn't
1265                  * find the unit number of the particular peripheral driver
1266                  * that the user is asking about.  e.g. the user asks for
1267                  * the passthrough driver for "da11".  We find the list of
1268                  * "da" peripherals all right, but there is no unit 11.
1269                  * The other possibility is that we went through the list
1270                  * of peripheral drivers attached to the device structure,
1271                  * but didn't find one with the name "pass".  Either way,
1272                  * we return ENOENT, since we couldn't find something.
1273                  */
1274                 if (periph == NULL) {
1275                         ccb->ccb_h.status = CAM_REQ_CMP_ERR;
1276                         ccb->cgdl.status = CAM_GDEVLIST_ERROR;
1277                         *ccb->cgdl.periph_name = '\0';
1278                         ccb->cgdl.unit_number = 0;
1279                         error = ENOENT;
1280                         /*
1281                          * It is unfortunate that this is even necessary,
1282                          * but there are many, many clueless users out there.
1283                          * If this is true, the user is looking for the
1284                          * passthrough driver, but doesn't have one in his
1285                          * kernel.
1286                          */
1287                         if (base_periph_found == 1) {
1288                                 printf("xptioctl: pass driver is not in the "
1289                                        "kernel\n");
1290                                 printf("xptioctl: put \"device pass0\" in "
1291                                        "your kernel config file\n");
1292                         }
1293                 }
1294                 splx(s);
1295                 break;
1296                 }
1297         default:
1298                 error = ENOTTY;
1299                 break;
1300         }
1301
1302         return(error);
1303 }
1304
1305 /* Functions accessed by the peripheral drivers */
1306 static void
1307 xpt_init(dummy)
1308         void *dummy;
1309 {
1310         struct cam_sim *xpt_sim;
1311         struct cam_path *path;
1312         struct cam_devq *devq;
1313         cam_status status;
1314
1315         TAILQ_INIT(&xpt_busses);
1316         TAILQ_INIT(&cam_bioq);
1317         TAILQ_INIT(&cam_netq);
1318         SLIST_INIT(&ccb_freeq);
1319         STAILQ_INIT(&highpowerq);
1320
1321         /*
1322          * The xpt layer is, itself, the equivelent of a SIM.
1323          * Allow 16 ccbs in the ccb pool for it.  This should
1324          * give decent parallelism when we probe busses and
1325          * perform other XPT functions.
1326          */
1327         devq = cam_simq_alloc(16);
1328         xpt_sim = cam_sim_alloc(xptaction,
1329                                 xptpoll,
1330                                 "xpt",
1331                                 /*softc*/NULL,
1332                                 /*unit*/0,
1333                                 /*max_dev_transactions*/0,
1334                                 /*max_tagged_dev_transactions*/0,
1335                                 devq);
1336         xpt_max_ccbs = 16;
1337                                 
1338         xpt_bus_register(xpt_sim, /*bus #*/0);
1339
1340         /*
1341          * Looking at the XPT from the SIM layer, the XPT is
1342          * the equivelent of a peripheral driver.  Allocate
1343          * a peripheral driver entry for us.
1344          */
1345         if ((status = xpt_create_path(&path, NULL, CAM_XPT_PATH_ID,
1346                                       CAM_TARGET_WILDCARD,
1347                                       CAM_LUN_WILDCARD)) != CAM_REQ_CMP) {
1348                 printf("xpt_init: xpt_create_path failed with status %#x,"
1349                        " failing attach\n", status);
1350                 return;
1351         }
1352
1353         cam_periph_alloc(xptregister, NULL, NULL, NULL, "xpt", CAM_PERIPH_BIO,
1354                          path, NULL, 0, NULL);
1355         xpt_free_path(path);
1356
1357         xpt_sim->softc = xpt_periph;
1358
1359         /*
1360          * Register a callback for when interrupts are enabled.
1361          */
1362         xpt_config_hook =
1363             (struct intr_config_hook *)malloc(sizeof(struct intr_config_hook),
1364                                               M_TEMP, M_NOWAIT | M_ZERO);
1365         if (xpt_config_hook == NULL) {
1366                 printf("xpt_init: Cannot malloc config hook "
1367                        "- failing attach\n");
1368                 return;
1369         }
1370
1371         xpt_config_hook->ich_func = xpt_config;
1372         if (config_intrhook_establish(xpt_config_hook) != 0) {
1373                 free (xpt_config_hook, M_TEMP);
1374                 printf("xpt_init: config_intrhook_establish failed "
1375                        "- failing attach\n");
1376         }
1377
1378         /* Install our software interrupt handlers */
1379         register_swi(SWI_CAMNET, swi_camnet, NULL, "swi_camnet");
1380         register_swi(SWI_CAMBIO, swi_cambio, NULL, "swi_cambio");
1381 }
1382
1383 static cam_status
1384 xptregister(struct cam_periph *periph, void *arg)
1385 {
1386         if (periph == NULL) {
1387                 printf("xptregister: periph was NULL!!\n");
1388                 return(CAM_REQ_CMP_ERR);
1389         }
1390
1391         periph->softc = NULL;
1392
1393         xpt_periph = periph;
1394
1395         return(CAM_REQ_CMP);
1396 }
1397
1398 int32_t
1399 xpt_add_periph(struct cam_periph *periph)
1400 {
1401         struct cam_ed *device;
1402         int32_t  status;
1403         struct periph_list *periph_head;
1404
1405         device = periph->path->device;
1406
1407         periph_head = &device->periphs;
1408
1409         status = CAM_REQ_CMP;
1410
1411         if (device != NULL) {
1412                 int s;
1413
1414                 /*
1415                  * Make room for this peripheral
1416                  * so it will fit in the queue
1417                  * when it's scheduled to run
1418                  */
1419                 s = splsoftcam();
1420                 status = camq_resize(&device->drvq,
1421                                      device->drvq.array_size + 1);
1422
1423                 device->generation++;
1424
1425                 SLIST_INSERT_HEAD(periph_head, periph, periph_links);
1426
1427                 splx(s);
1428         }
1429
1430         xsoftc.generation++;
1431
1432         return (status);
1433 }
1434
1435 void
1436 xpt_remove_periph(struct cam_periph *periph)
1437 {
1438         struct cam_ed *device;
1439
1440         device = periph->path->device;
1441
1442         if (device != NULL) {
1443                 int s;
1444                 struct periph_list *periph_head;
1445
1446                 periph_head = &device->periphs;
1447                 
1448                 /* Release the slot for this peripheral */
1449                 s = splsoftcam();
1450                 camq_resize(&device->drvq, device->drvq.array_size - 1);
1451
1452                 device->generation++;
1453
1454                 SLIST_REMOVE(periph_head, periph, cam_periph, periph_links);
1455
1456                 splx(s);
1457         }
1458
1459         xsoftc.generation++;
1460
1461 }
1462
1463 void
1464 xpt_announce_periph(struct cam_periph *periph, char *announce_string)
1465 {
1466         int s;
1467         u_int mb;
1468         struct cam_path *path;
1469         struct ccb_trans_settings cts;
1470
1471         path = periph->path;
1472         /*
1473          * To ensure that this is printed in one piece,
1474          * mask out CAM interrupts.
1475          */
1476         s = splsoftcam();
1477         printf("%s%d at %s%d bus %d target %d lun %d\n",
1478                periph->periph_name, periph->unit_number,
1479                path->bus->sim->sim_name,
1480                path->bus->sim->unit_number,
1481                path->bus->sim->bus_id,
1482                path->target->target_id,
1483                path->device->lun_id);
1484         printf("%s%d: ", periph->periph_name, periph->unit_number);
1485         scsi_print_inquiry(&path->device->inq_data);
1486         if ((bootverbose)
1487          && (path->device->serial_num_len > 0)) {
1488                 /* Don't wrap the screen  - print only the first 60 chars */
1489                 printf("%s%d: Serial Number %.60s\n", periph->periph_name,
1490                        periph->unit_number, path->device->serial_num);
1491         }
1492         xpt_setup_ccb(&cts.ccb_h, path, /*priority*/1);
1493         cts.ccb_h.func_code = XPT_GET_TRAN_SETTINGS;
1494         cts.flags = CCB_TRANS_CURRENT_SETTINGS;
1495         xpt_action((union ccb*)&cts);
1496         if (cts.ccb_h.status == CAM_REQ_CMP) {
1497                 u_int speed;
1498                 u_int freq;
1499
1500                 if ((cts.valid & CCB_TRANS_SYNC_OFFSET_VALID) != 0
1501                   && cts.sync_offset != 0) {
1502                         freq = scsi_calc_syncsrate(cts.sync_period);
1503                         speed = freq;
1504                 } else {
1505                         struct ccb_pathinq cpi;
1506
1507                         /* Ask the SIM for its base transfer speed */
1508                         xpt_setup_ccb(&cpi.ccb_h, path, /*priority*/1);
1509                         cpi.ccb_h.func_code = XPT_PATH_INQ;
1510                         xpt_action((union ccb *)&cpi);
1511
1512                         speed = cpi.base_transfer_speed;
1513                         freq = 0;
1514                 }
1515                 if ((cts.valid & CCB_TRANS_BUS_WIDTH_VALID) != 0)
1516                         speed *= (0x01 << cts.bus_width);
1517                 mb = speed / 1000;
1518                 if (mb > 0)
1519                         printf("%s%d: %d.%03dMB/s transfers",
1520                                periph->periph_name, periph->unit_number,
1521                                mb, speed % 1000);
1522                 else
1523                         printf("%s%d: %dKB/s transfers", periph->periph_name,
1524                                periph->unit_number, speed);
1525                 if ((cts.valid & CCB_TRANS_SYNC_OFFSET_VALID) != 0
1526                  && cts.sync_offset != 0) {
1527                         printf(" (%d.%03dMHz, offset %d", freq / 1000,
1528                                freq % 1000, cts.sync_offset);
1529                 }
1530                 if ((cts.valid & CCB_TRANS_BUS_WIDTH_VALID) != 0
1531                  && cts.bus_width > 0) {
1532                         if ((cts.valid & CCB_TRANS_SYNC_OFFSET_VALID) != 0
1533                          && cts.sync_offset != 0) {
1534                                 printf(", ");
1535                         } else {
1536                                 printf(" (");
1537                         }
1538                         printf("%dbit)", 8 * (0x01 << cts.bus_width));
1539                 } else if ((cts.valid & CCB_TRANS_SYNC_OFFSET_VALID) != 0
1540                         && cts.sync_offset != 0) {
1541                         printf(")");
1542                 }
1543
1544                 if (path->device->inq_flags & SID_CmdQue
1545                  || path->device->flags & CAM_DEV_TAG_AFTER_COUNT) {
1546                         printf(", Tagged Queueing Enabled");
1547                 }
1548
1549                 printf("\n");
1550         } else if (path->device->inq_flags & SID_CmdQue
1551                 || path->device->flags & CAM_DEV_TAG_AFTER_COUNT) {
1552                 printf("%s%d: Tagged Queueing Enabled\n",
1553                        periph->periph_name, periph->unit_number);
1554         }
1555
1556         /*
1557          * We only want to print the caller's announce string if they've
1558          * passed one in..
1559          */
1560         if (announce_string != NULL)
1561                 printf("%s%d: %s\n", periph->periph_name,
1562                        periph->unit_number, announce_string);
1563         splx(s);
1564 }
1565
1566
1567 static dev_match_ret
1568 xptbusmatch(struct dev_match_pattern *patterns, int num_patterns,
1569             struct cam_eb *bus)
1570 {
1571         dev_match_ret retval;
1572         int i;
1573
1574         retval = DM_RET_NONE;
1575
1576         /*
1577          * If we aren't given something to match against, that's an error.
1578          */
1579         if (bus == NULL)
1580                 return(DM_RET_ERROR);
1581
1582         /*
1583          * If there are no match entries, then this bus matches no
1584          * matter what.
1585          */
1586         if ((patterns == NULL) || (num_patterns == 0))
1587                 return(DM_RET_DESCEND | DM_RET_COPY);
1588
1589         for (i = 0; i < num_patterns; i++) {
1590                 struct bus_match_pattern *cur_pattern;
1591
1592                 /*
1593                  * If the pattern in question isn't for a bus node, we
1594                  * aren't interested.  However, we do indicate to the
1595                  * calling routine that we should continue descending the
1596                  * tree, since the user wants to match against lower-level
1597                  * EDT elements.
1598                  */
1599                 if (patterns[i].type != DEV_MATCH_BUS) {
1600                         if ((retval & DM_RET_ACTION_MASK) == DM_RET_NONE)
1601                                 retval |= DM_RET_DESCEND;
1602                         continue;
1603                 }
1604
1605                 cur_pattern = &patterns[i].pattern.bus_pattern;
1606
1607                 /*
1608                  * If they want to match any bus node, we give them any
1609                  * device node.
1610                  */
1611                 if (cur_pattern->flags == BUS_MATCH_ANY) {
1612                         /* set the copy flag */
1613                         retval |= DM_RET_COPY;
1614
1615                         /*
1616                          * If we've already decided on an action, go ahead
1617                          * and return.
1618                          */
1619                         if ((retval & DM_RET_ACTION_MASK) != DM_RET_NONE)
1620                                 return(retval);
1621                 }
1622
1623                 /*
1624                  * Not sure why someone would do this...
1625                  */
1626                 if (cur_pattern->flags == BUS_MATCH_NONE)
1627                         continue;
1628
1629                 if (((cur_pattern->flags & BUS_MATCH_PATH) != 0)
1630                  && (cur_pattern->path_id != bus->path_id))
1631                         continue;
1632
1633                 if (((cur_pattern->flags & BUS_MATCH_BUS_ID) != 0)
1634                  && (cur_pattern->bus_id != bus->sim->bus_id))
1635                         continue;
1636
1637                 if (((cur_pattern->flags & BUS_MATCH_UNIT) != 0)
1638                  && (cur_pattern->unit_number != bus->sim->unit_number))
1639                         continue;
1640
1641                 if (((cur_pattern->flags & BUS_MATCH_NAME) != 0)
1642                  && (strncmp(cur_pattern->dev_name, bus->sim->sim_name,
1643                              DEV_IDLEN) != 0))
1644                         continue;
1645
1646                 /*
1647                  * If we get to this point, the user definitely wants 
1648                  * information on this bus.  So tell the caller to copy the
1649                  * data out.
1650                  */
1651                 retval |= DM_RET_COPY;
1652
1653                 /*
1654                  * If the return action has been set to descend, then we
1655                  * know that we've already seen a non-bus matching
1656                  * expression, therefore we need to further descend the tree.
1657                  * This won't change by continuing around the loop, so we
1658                  * go ahead and return.  If we haven't seen a non-bus
1659                  * matching expression, we keep going around the loop until
1660                  * we exhaust the matching expressions.  We'll set the stop
1661                  * flag once we fall out of the loop.
1662                  */
1663                 if ((retval & DM_RET_ACTION_MASK) == DM_RET_DESCEND)
1664                         return(retval);
1665         }
1666
1667         /*
1668          * If the return action hasn't been set to descend yet, that means
1669          * we haven't seen anything other than bus matching patterns.  So
1670          * tell the caller to stop descending the tree -- the user doesn't
1671          * want to match against lower level tree elements.
1672          */
1673         if ((retval & DM_RET_ACTION_MASK) == DM_RET_NONE)
1674                 retval |= DM_RET_STOP;
1675
1676         return(retval);
1677 }
1678
1679 static dev_match_ret
1680 xptdevicematch(struct dev_match_pattern *patterns, int num_patterns,
1681                struct cam_ed *device)
1682 {
1683         dev_match_ret retval;
1684         int i;
1685
1686         retval = DM_RET_NONE;
1687
1688         /*
1689          * If we aren't given something to match against, that's an error.
1690          */
1691         if (device == NULL)
1692                 return(DM_RET_ERROR);
1693
1694         /*
1695          * If there are no match entries, then this device matches no
1696          * matter what.
1697          */
1698         if ((patterns == NULL) || (patterns == 0))
1699                 return(DM_RET_DESCEND | DM_RET_COPY);
1700
1701         for (i = 0; i < num_patterns; i++) {
1702                 struct device_match_pattern *cur_pattern;
1703
1704                 /*
1705                  * If the pattern in question isn't for a device node, we
1706                  * aren't interested.
1707                  */
1708                 if (patterns[i].type != DEV_MATCH_DEVICE) {
1709                         if ((patterns[i].type == DEV_MATCH_PERIPH)
1710                          && ((retval & DM_RET_ACTION_MASK) == DM_RET_NONE))
1711                                 retval |= DM_RET_DESCEND;
1712                         continue;
1713                 }
1714
1715                 cur_pattern = &patterns[i].pattern.device_pattern;
1716
1717                 /*
1718                  * If they want to match any device node, we give them any
1719                  * device node.
1720                  */
1721                 if (cur_pattern->flags == DEV_MATCH_ANY) {
1722                         /* set the copy flag */
1723                         retval |= DM_RET_COPY;
1724
1725                         
1726                         /*
1727                          * If we've already decided on an action, go ahead
1728                          * and return.
1729                          */
1730                         if ((retval & DM_RET_ACTION_MASK) != DM_RET_NONE)
1731                                 return(retval);
1732                 }
1733
1734                 /*
1735                  * Not sure why someone would do this...
1736                  */
1737                 if (cur_pattern->flags == DEV_MATCH_NONE)
1738                         continue;
1739
1740                 if (((cur_pattern->flags & DEV_MATCH_PATH) != 0)
1741                  && (cur_pattern->path_id != device->target->bus->path_id))
1742                         continue;
1743
1744                 if (((cur_pattern->flags & DEV_MATCH_TARGET) != 0)
1745                  && (cur_pattern->target_id != device->target->target_id))
1746                         continue;
1747
1748                 if (((cur_pattern->flags & DEV_MATCH_LUN) != 0)
1749                  && (cur_pattern->target_lun != device->lun_id))
1750                         continue;
1751
1752                 if (((cur_pattern->flags & DEV_MATCH_INQUIRY) != 0)
1753                  && (cam_quirkmatch((caddr_t)&device->inq_data,
1754                                     (caddr_t)&cur_pattern->inq_pat,
1755                                     1, sizeof(cur_pattern->inq_pat),
1756                                     scsi_static_inquiry_match) == NULL))
1757                         continue;
1758
1759                 /*
1760                  * If we get to this point, the user definitely wants 
1761                  * information on this device.  So tell the caller to copy
1762                  * the data out.
1763                  */
1764                 retval |= DM_RET_COPY;
1765
1766                 /*
1767                  * If the return action has been set to descend, then we
1768                  * know that we've already seen a peripheral matching
1769                  * expression, therefore we need to further descend the tree.
1770                  * This won't change by continuing around the loop, so we
1771                  * go ahead and return.  If we haven't seen a peripheral
1772                  * matching expression, we keep going around the loop until
1773                  * we exhaust the matching expressions.  We'll set the stop
1774                  * flag once we fall out of the loop.
1775                  */
1776                 if ((retval & DM_RET_ACTION_MASK) == DM_RET_DESCEND)
1777                         return(retval);
1778         }
1779
1780         /*
1781          * If the return action hasn't been set to descend yet, that means
1782          * we haven't seen any peripheral matching patterns.  So tell the
1783          * caller to stop descending the tree -- the user doesn't want to
1784          * match against lower level tree elements.
1785          */
1786         if ((retval & DM_RET_ACTION_MASK) == DM_RET_NONE)
1787                 retval |= DM_RET_STOP;
1788
1789         return(retval);
1790 }
1791
1792 /*
1793  * Match a single peripheral against any number of match patterns.
1794  */
1795 static dev_match_ret
1796 xptperiphmatch(struct dev_match_pattern *patterns, int num_patterns,
1797                struct cam_periph *periph)
1798 {
1799         dev_match_ret retval;
1800         int i;
1801
1802         /*
1803          * If we aren't given something to match against, that's an error.
1804          */
1805         if (periph == NULL)
1806                 return(DM_RET_ERROR);
1807
1808         /*
1809          * If there are no match entries, then this peripheral matches no
1810          * matter what.
1811          */
1812         if ((patterns == NULL) || (num_patterns == 0))
1813                 return(DM_RET_STOP | DM_RET_COPY);
1814
1815         /*
1816          * There aren't any nodes below a peripheral node, so there's no
1817          * reason to descend the tree any further.
1818          */
1819         retval = DM_RET_STOP;
1820
1821         for (i = 0; i < num_patterns; i++) {
1822                 struct periph_match_pattern *cur_pattern;
1823
1824                 /*
1825                  * If the pattern in question isn't for a peripheral, we
1826                  * aren't interested.
1827                  */
1828                 if (patterns[i].type != DEV_MATCH_PERIPH)
1829                         continue;
1830
1831                 cur_pattern = &patterns[i].pattern.periph_pattern;
1832
1833                 /*
1834                  * If they want to match on anything, then we will do so.
1835                  */
1836                 if (cur_pattern->flags == PERIPH_MATCH_ANY) {
1837                         /* set the copy flag */
1838                         retval |= DM_RET_COPY;
1839
1840                         /*
1841                          * We've already set the return action to stop,
1842                          * since there are no nodes below peripherals in
1843                          * the tree.
1844                          */
1845                         return(retval);
1846                 }
1847
1848                 /*
1849                  * Not sure why someone would do this...
1850                  */
1851                 if (cur_pattern->flags == PERIPH_MATCH_NONE)
1852                         continue;
1853
1854                 if (((cur_pattern->flags & PERIPH_MATCH_PATH) != 0)
1855                  && (cur_pattern->path_id != periph->path->bus->path_id))
1856                         continue;
1857
1858                 /*
1859                  * For the target and lun id's, we have to make sure the
1860                  * target and lun pointers aren't NULL.  The xpt peripheral
1861                  * has a wildcard target and device.
1862                  */
1863                 if (((cur_pattern->flags & PERIPH_MATCH_TARGET) != 0)
1864                  && ((periph->path->target == NULL)
1865                  ||(cur_pattern->target_id != periph->path->target->target_id)))
1866                         continue;
1867
1868                 if (((cur_pattern->flags & PERIPH_MATCH_LUN) != 0)
1869                  && ((periph->path->device == NULL)
1870                  || (cur_pattern->target_lun != periph->path->device->lun_id)))
1871                         continue;
1872
1873                 if (((cur_pattern->flags & PERIPH_MATCH_UNIT) != 0)
1874                  && (cur_pattern->unit_number != periph->unit_number))
1875                         continue;
1876
1877                 if (((cur_pattern->flags & PERIPH_MATCH_NAME) != 0)
1878                  && (strncmp(cur_pattern->periph_name, periph->periph_name,
1879                              DEV_IDLEN) != 0))
1880                         continue;
1881
1882                 /*
1883                  * If we get to this point, the user definitely wants 
1884                  * information on this peripheral.  So tell the caller to
1885                  * copy the data out.
1886                  */
1887                 retval |= DM_RET_COPY;
1888
1889                 /*
1890                  * The return action has already been set to stop, since
1891                  * peripherals don't have any nodes below them in the EDT.
1892                  */
1893                 return(retval);
1894         }
1895
1896         /*
1897          * If we get to this point, the peripheral that was passed in
1898          * doesn't match any of the patterns.
1899          */
1900         return(retval);
1901 }
1902
1903 static int
1904 xptedtbusfunc(struct cam_eb *bus, void *arg)
1905 {
1906         struct ccb_dev_match *cdm;
1907         dev_match_ret retval;
1908
1909         cdm = (struct ccb_dev_match *)arg;
1910
1911         /*
1912          * If our position is for something deeper in the tree, that means
1913          * that we've already seen this node.  So, we keep going down.
1914          */
1915         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
1916          && (cdm->pos.cookie.bus == bus)
1917          && (cdm->pos.position_type & CAM_DEV_POS_TARGET)
1918          && (cdm->pos.cookie.target != NULL))
1919                 retval = DM_RET_DESCEND;
1920         else
1921                 retval = xptbusmatch(cdm->patterns, cdm->num_patterns, bus);
1922
1923         /*
1924          * If we got an error, bail out of the search.
1925          */
1926         if ((retval & DM_RET_ACTION_MASK) == DM_RET_ERROR) {
1927                 cdm->status = CAM_DEV_MATCH_ERROR;
1928                 return(0);
1929         }
1930
1931         /*
1932          * If the copy flag is set, copy this bus out.
1933          */
1934         if (retval & DM_RET_COPY) {
1935                 int spaceleft, j;
1936
1937                 spaceleft = cdm->match_buf_len - (cdm->num_matches *
1938                         sizeof(struct dev_match_result));
1939
1940                 /*
1941                  * If we don't have enough space to put in another
1942                  * match result, save our position and tell the
1943                  * user there are more devices to check.
1944                  */
1945                 if (spaceleft < sizeof(struct dev_match_result)) {
1946                         bzero(&cdm->pos, sizeof(cdm->pos));
1947                         cdm->pos.position_type = 
1948                                 CAM_DEV_POS_EDT | CAM_DEV_POS_BUS;
1949
1950                         cdm->pos.cookie.bus = bus;
1951                         cdm->pos.generations[CAM_BUS_GENERATION]=
1952                                 bus_generation;
1953                         cdm->status = CAM_DEV_MATCH_MORE;
1954                         return(0);
1955                 }
1956                 j = cdm->num_matches;
1957                 cdm->num_matches++;
1958                 cdm->matches[j].type = DEV_MATCH_BUS;
1959                 cdm->matches[j].result.bus_result.path_id = bus->path_id;
1960                 cdm->matches[j].result.bus_result.bus_id = bus->sim->bus_id;
1961                 cdm->matches[j].result.bus_result.unit_number =
1962                         bus->sim->unit_number;
1963                 strncpy(cdm->matches[j].result.bus_result.dev_name,
1964                         bus->sim->sim_name, DEV_IDLEN);
1965         }
1966
1967         /*
1968          * If the user is only interested in busses, there's no
1969          * reason to descend to the next level in the tree.
1970          */
1971         if ((retval & DM_RET_ACTION_MASK) == DM_RET_STOP)
1972                 return(1);
1973
1974         /*
1975          * If there is a target generation recorded, check it to
1976          * make sure the target list hasn't changed.
1977          */
1978         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
1979          && (bus == cdm->pos.cookie.bus)
1980          && (cdm->pos.position_type & CAM_DEV_POS_TARGET)
1981          && (cdm->pos.generations[CAM_TARGET_GENERATION] != 0)
1982          && (cdm->pos.generations[CAM_TARGET_GENERATION] !=
1983              bus->generation)) {
1984                 cdm->status = CAM_DEV_MATCH_LIST_CHANGED;
1985                 return(0);
1986         }
1987
1988         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
1989          && (cdm->pos.cookie.bus == bus)
1990          && (cdm->pos.position_type & CAM_DEV_POS_TARGET)
1991          && (cdm->pos.cookie.target != NULL))
1992                 return(xpttargettraverse(bus,
1993                                         (struct cam_et *)cdm->pos.cookie.target,
1994                                          xptedttargetfunc, arg));
1995         else
1996                 return(xpttargettraverse(bus, NULL, xptedttargetfunc, arg));
1997 }
1998
1999 static int
2000 xptedttargetfunc(struct cam_et *target, void *arg)
2001 {
2002         struct ccb_dev_match *cdm;
2003
2004         cdm = (struct ccb_dev_match *)arg;
2005
2006         /*
2007          * If there is a device list generation recorded, check it to
2008          * make sure the device list hasn't changed.
2009          */
2010         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
2011          && (cdm->pos.cookie.bus == target->bus)
2012          && (cdm->pos.position_type & CAM_DEV_POS_TARGET)
2013          && (cdm->pos.cookie.target == target)
2014          && (cdm->pos.position_type & CAM_DEV_POS_DEVICE)
2015          && (cdm->pos.generations[CAM_DEV_GENERATION] != 0)
2016          && (cdm->pos.generations[CAM_DEV_GENERATION] !=
2017              target->generation)) {
2018                 cdm->status = CAM_DEV_MATCH_LIST_CHANGED;
2019                 return(0);
2020         }
2021
2022         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
2023          && (cdm->pos.cookie.bus == target->bus)
2024          && (cdm->pos.position_type & CAM_DEV_POS_TARGET)
2025          && (cdm->pos.cookie.target == target)
2026          && (cdm->pos.position_type & CAM_DEV_POS_DEVICE)
2027          && (cdm->pos.cookie.device != NULL))
2028                 return(xptdevicetraverse(target,
2029                                         (struct cam_ed *)cdm->pos.cookie.device,
2030                                          xptedtdevicefunc, arg));
2031         else
2032                 return(xptdevicetraverse(target, NULL, xptedtdevicefunc, arg));
2033 }
2034
2035 static int
2036 xptedtdevicefunc(struct cam_ed *device, void *arg)
2037 {
2038
2039         struct ccb_dev_match *cdm;
2040         dev_match_ret retval;
2041
2042         cdm = (struct ccb_dev_match *)arg;
2043
2044         /*
2045          * If our position is for something deeper in the tree, that means
2046          * that we've already seen this node.  So, we keep going down.
2047          */
2048         if ((cdm->pos.position_type & CAM_DEV_POS_DEVICE)
2049          && (cdm->pos.cookie.device == device)
2050          && (cdm->pos.position_type & CAM_DEV_POS_PERIPH)
2051          && (cdm->pos.cookie.periph != NULL))
2052                 retval = DM_RET_DESCEND;
2053         else
2054                 retval = xptdevicematch(cdm->patterns, cdm->num_patterns,
2055                                         device);
2056
2057         if ((retval & DM_RET_ACTION_MASK) == DM_RET_ERROR) {
2058                 cdm->status = CAM_DEV_MATCH_ERROR;
2059                 return(0);
2060         }
2061
2062         /*
2063          * If the copy flag is set, copy this device out.
2064          */
2065         if (retval & DM_RET_COPY) {
2066                 int spaceleft, j;
2067
2068                 spaceleft = cdm->match_buf_len - (cdm->num_matches *
2069                         sizeof(struct dev_match_result));
2070
2071                 /*
2072                  * If we don't have enough space to put in another
2073                  * match result, save our position and tell the
2074                  * user there are more devices to check.
2075                  */
2076                 if (spaceleft < sizeof(struct dev_match_result)) {
2077                         bzero(&cdm->pos, sizeof(cdm->pos));
2078                         cdm->pos.position_type = 
2079                                 CAM_DEV_POS_EDT | CAM_DEV_POS_BUS |
2080                                 CAM_DEV_POS_TARGET | CAM_DEV_POS_DEVICE;
2081
2082                         cdm->pos.cookie.bus = device->target->bus;
2083                         cdm->pos.generations[CAM_BUS_GENERATION]=
2084                                 bus_generation;
2085                         cdm->pos.cookie.target = device->target;
2086                         cdm->pos.generations[CAM_TARGET_GENERATION] =
2087                                 device->target->bus->generation;
2088                         cdm->pos.cookie.device = device;
2089                         cdm->pos.generations[CAM_DEV_GENERATION] = 
2090                                 device->target->generation;
2091                         cdm->status = CAM_DEV_MATCH_MORE;
2092                         return(0);
2093                 }
2094                 j = cdm->num_matches;
2095                 cdm->num_matches++;
2096                 cdm->matches[j].type = DEV_MATCH_DEVICE;
2097                 cdm->matches[j].result.device_result.path_id =
2098                         device->target->bus->path_id;
2099                 cdm->matches[j].result.device_result.target_id =
2100                         device->target->target_id;
2101                 cdm->matches[j].result.device_result.target_lun =
2102                         device->lun_id;
2103                 bcopy(&device->inq_data,
2104                       &cdm->matches[j].result.device_result.inq_data,
2105                       sizeof(struct scsi_inquiry_data));
2106
2107                 /* Let the user know whether this device is unconfigured */
2108                 if (device->flags & CAM_DEV_UNCONFIGURED)
2109                         cdm->matches[j].result.device_result.flags =
2110                                 DEV_RESULT_UNCONFIGURED;
2111                 else
2112                         cdm->matches[j].result.device_result.flags =
2113                                 DEV_RESULT_NOFLAG;
2114         }
2115
2116         /*
2117          * If the user isn't interested in peripherals, don't descend
2118          * the tree any further.
2119          */
2120         if ((retval & DM_RET_ACTION_MASK) == DM_RET_STOP)
2121                 return(1);
2122
2123         /*
2124          * If there is a peripheral list generation recorded, make sure
2125          * it hasn't changed.
2126          */
2127         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
2128          && (device->target->bus == cdm->pos.cookie.bus)
2129          && (cdm->pos.position_type & CAM_DEV_POS_TARGET)
2130          && (device->target == cdm->pos.cookie.target)
2131          && (cdm->pos.position_type & CAM_DEV_POS_DEVICE)
2132          && (device == cdm->pos.cookie.device)
2133          && (cdm->pos.position_type & CAM_DEV_POS_PERIPH)
2134          && (cdm->pos.generations[CAM_PERIPH_GENERATION] != 0)
2135          && (cdm->pos.generations[CAM_PERIPH_GENERATION] !=
2136              device->generation)){
2137                 cdm->status = CAM_DEV_MATCH_LIST_CHANGED;
2138                 return(0);
2139         }
2140
2141         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
2142          && (cdm->pos.cookie.bus == device->target->bus)
2143          && (cdm->pos.position_type & CAM_DEV_POS_TARGET)
2144          && (cdm->pos.cookie.target == device->target)
2145          && (cdm->pos.position_type & CAM_DEV_POS_DEVICE)
2146          && (cdm->pos.cookie.device == device)
2147          && (cdm->pos.position_type & CAM_DEV_POS_PERIPH)
2148          && (cdm->pos.cookie.periph != NULL))
2149                 return(xptperiphtraverse(device,
2150                                 (struct cam_periph *)cdm->pos.cookie.periph,
2151                                 xptedtperiphfunc, arg));
2152         else
2153                 return(xptperiphtraverse(device, NULL, xptedtperiphfunc, arg));
2154 }
2155
2156 static int
2157 xptedtperiphfunc(struct cam_periph *periph, void *arg)
2158 {
2159         struct ccb_dev_match *cdm;
2160         dev_match_ret retval;
2161
2162         cdm = (struct ccb_dev_match *)arg;
2163
2164         retval = xptperiphmatch(cdm->patterns, cdm->num_patterns, periph);
2165
2166         if ((retval & DM_RET_ACTION_MASK) == DM_RET_ERROR) {
2167                 cdm->status = CAM_DEV_MATCH_ERROR;
2168                 return(0);
2169         }
2170
2171         /*
2172          * If the copy flag is set, copy this peripheral out.
2173          */
2174         if (retval & DM_RET_COPY) {
2175                 int spaceleft, j;
2176
2177                 spaceleft = cdm->match_buf_len - (cdm->num_matches *
2178                         sizeof(struct dev_match_result));
2179
2180                 /*
2181                  * If we don't have enough space to put in another
2182                  * match result, save our position and tell the
2183                  * user there are more devices to check.
2184                  */
2185                 if (spaceleft < sizeof(struct dev_match_result)) {
2186                         bzero(&cdm->pos, sizeof(cdm->pos));
2187                         cdm->pos.position_type = 
2188                                 CAM_DEV_POS_EDT | CAM_DEV_POS_BUS |
2189                                 CAM_DEV_POS_TARGET | CAM_DEV_POS_DEVICE |
2190                                 CAM_DEV_POS_PERIPH;
2191
2192                         cdm->pos.cookie.bus = periph->path->bus;
2193                         cdm->pos.generations[CAM_BUS_GENERATION]=
2194                                 bus_generation;
2195                         cdm->pos.cookie.target = periph->path->target;
2196                         cdm->pos.generations[CAM_TARGET_GENERATION] =
2197                                 periph->path->bus->generation;
2198                         cdm->pos.cookie.device = periph->path->device;
2199                         cdm->pos.generations[CAM_DEV_GENERATION] = 
2200                                 periph->path->target->generation;
2201                         cdm->pos.cookie.periph = periph;
2202                         cdm->pos.generations[CAM_PERIPH_GENERATION] =
2203                                 periph->path->device->generation;
2204                         cdm->status = CAM_DEV_MATCH_MORE;
2205                         return(0);
2206                 }
2207
2208                 j = cdm->num_matches;
2209                 cdm->num_matches++;
2210                 cdm->matches[j].type = DEV_MATCH_PERIPH;
2211                 cdm->matches[j].result.periph_result.path_id =
2212                         periph->path->bus->path_id;
2213                 cdm->matches[j].result.periph_result.target_id =
2214                         periph->path->target->target_id;
2215                 cdm->matches[j].result.periph_result.target_lun =
2216                         periph->path->device->lun_id;
2217                 cdm->matches[j].result.periph_result.unit_number =
2218                         periph->unit_number;
2219                 strncpy(cdm->matches[j].result.periph_result.periph_name,
2220                         periph->periph_name, DEV_IDLEN);
2221         }
2222
2223         return(1);
2224 }
2225
2226 static int
2227 xptedtmatch(struct ccb_dev_match *cdm)
2228 {
2229         int ret;
2230
2231         cdm->num_matches = 0;
2232
2233         /*
2234          * Check the bus list generation.  If it has changed, the user
2235          * needs to reset everything and start over.
2236          */
2237         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
2238          && (cdm->pos.generations[CAM_BUS_GENERATION] != 0)
2239          && (cdm->pos.generations[CAM_BUS_GENERATION] != bus_generation)) {
2240                 cdm->status = CAM_DEV_MATCH_LIST_CHANGED;
2241                 return(0);
2242         }
2243
2244         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
2245          && (cdm->pos.cookie.bus != NULL))
2246                 ret = xptbustraverse((struct cam_eb *)cdm->pos.cookie.bus,
2247                                      xptedtbusfunc, cdm);
2248         else
2249                 ret = xptbustraverse(NULL, xptedtbusfunc, cdm);
2250
2251         /*
2252          * If we get back 0, that means that we had to stop before fully
2253          * traversing the EDT.  It also means that one of the subroutines
2254          * has set the status field to the proper value.  If we get back 1,
2255          * we've fully traversed the EDT and copied out any matching entries.
2256          */
2257         if (ret == 1)
2258                 cdm->status = CAM_DEV_MATCH_LAST;
2259
2260         return(ret);
2261 }
2262
2263 static int
2264 xptplistpdrvfunc(struct periph_driver **pdrv, void *arg)
2265 {
2266         struct ccb_dev_match *cdm;
2267
2268         cdm = (struct ccb_dev_match *)arg;
2269
2270         if ((cdm->pos.position_type & CAM_DEV_POS_PDPTR)
2271          && (cdm->pos.cookie.pdrv == pdrv)
2272          && (cdm->pos.position_type & CAM_DEV_POS_PERIPH)
2273          && (cdm->pos.generations[CAM_PERIPH_GENERATION] != 0)
2274          && (cdm->pos.generations[CAM_PERIPH_GENERATION] !=
2275              (*pdrv)->generation)) {
2276                 cdm->status = CAM_DEV_MATCH_LIST_CHANGED;
2277                 return(0);
2278         }
2279
2280         if ((cdm->pos.position_type & CAM_DEV_POS_PDPTR)
2281          && (cdm->pos.cookie.pdrv == pdrv)
2282          && (cdm->pos.position_type & CAM_DEV_POS_PERIPH)
2283          && (cdm->pos.cookie.periph != NULL))
2284                 return(xptpdperiphtraverse(pdrv,
2285                                 (struct cam_periph *)cdm->pos.cookie.periph,
2286                                 xptplistperiphfunc, arg));
2287         else
2288                 return(xptpdperiphtraverse(pdrv, NULL,xptplistperiphfunc, arg));
2289 }
2290
2291 static int
2292 xptplistperiphfunc(struct cam_periph *periph, void *arg)
2293 {
2294         struct ccb_dev_match *cdm;
2295         dev_match_ret retval;
2296
2297         cdm = (struct ccb_dev_match *)arg;
2298
2299         retval = xptperiphmatch(cdm->patterns, cdm->num_patterns, periph);
2300
2301         if ((retval & DM_RET_ACTION_MASK) == DM_RET_ERROR) {
2302                 cdm->status = CAM_DEV_MATCH_ERROR;
2303                 return(0);
2304         }
2305
2306         /*
2307          * If the copy flag is set, copy this peripheral out.
2308          */
2309         if (retval & DM_RET_COPY) {
2310                 int spaceleft, j;
2311
2312                 spaceleft = cdm->match_buf_len - (cdm->num_matches *
2313                         sizeof(struct dev_match_result));
2314
2315                 /*
2316                  * If we don't have enough space to put in another
2317                  * match result, save our position and tell the
2318                  * user there are more devices to check.
2319                  */
2320                 if (spaceleft < sizeof(struct dev_match_result)) {
2321                         struct periph_driver **pdrv;
2322
2323                         pdrv = NULL;
2324                         bzero(&cdm->pos, sizeof(cdm->pos));
2325                         cdm->pos.position_type = 
2326                                 CAM_DEV_POS_PDRV | CAM_DEV_POS_PDPTR |
2327                                 CAM_DEV_POS_PERIPH;
2328
2329                         /*
2330                          * This may look a bit non-sensical, but it is
2331                          * actually quite logical.  There are very few
2332                          * peripheral drivers, and bloating every peripheral
2333                          * structure with a pointer back to its parent
2334                          * peripheral driver linker set entry would cost
2335                          * more in the long run than doing this quick lookup.
2336                          */
2337                         SET_FOREACH(pdrv, periphdriver_set) {
2338                                 if (strcmp((*pdrv)->driver_name,
2339                                     periph->periph_name) == 0)
2340                                         break;
2341                         }
2342
2343                         if (pdrv == NULL) {
2344                                 cdm->status = CAM_DEV_MATCH_ERROR;
2345                                 return(0);
2346                         }
2347
2348                         cdm->pos.cookie.pdrv = pdrv;
2349                         /*
2350                          * The periph generation slot does double duty, as
2351                          * does the periph pointer slot.  They are used for
2352                          * both edt and pdrv lookups and positioning.
2353                          */
2354                         cdm->pos.cookie.periph = periph;
2355                         cdm->pos.generations[CAM_PERIPH_GENERATION] =
2356                                 (*pdrv)->generation;
2357                         cdm->status = CAM_DEV_MATCH_MORE;
2358                         return(0);
2359                 }
2360
2361                 j = cdm->num_matches;
2362                 cdm->num_matches++;
2363                 cdm->matches[j].type = DEV_MATCH_PERIPH;
2364                 cdm->matches[j].result.periph_result.path_id =
2365                         periph->path->bus->path_id;
2366
2367                 /*
2368                  * The transport layer peripheral doesn't have a target or
2369                  * lun.
2370                  */
2371                 if (periph->path->target)
2372                         cdm->matches[j].result.periph_result.target_id =
2373                                 periph->path->target->target_id;
2374                 else
2375                         cdm->matches[j].result.periph_result.target_id = -1;
2376
2377                 if (periph->path->device)
2378                         cdm->matches[j].result.periph_result.target_lun =
2379                                 periph->path->device->lun_id;
2380                 else
2381                         cdm->matches[j].result.periph_result.target_lun = -1;
2382
2383                 cdm->matches[j].result.periph_result.unit_number =
2384                         periph->unit_number;
2385                 strncpy(cdm->matches[j].result.periph_result.periph_name,
2386                         periph->periph_name, DEV_IDLEN);
2387         }
2388
2389         return(1);
2390 }
2391
2392 static int
2393 xptperiphlistmatch(struct ccb_dev_match *cdm)
2394 {
2395         int ret;
2396
2397         cdm->num_matches = 0;
2398
2399         /*
2400          * At this point in the edt traversal function, we check the bus
2401          * list generation to make sure that no busses have been added or
2402          * removed since the user last sent a XPT_DEV_MATCH ccb through.
2403          * For the peripheral driver list traversal function, however, we
2404          * don't have to worry about new peripheral driver types coming or
2405          * going; they're in a linker set, and therefore can't change
2406          * without a recompile.
2407          */
2408
2409         if ((cdm->pos.position_type & CAM_DEV_POS_PDPTR)
2410          && (cdm->pos.cookie.pdrv != NULL))
2411                 ret = xptpdrvtraverse(
2412                                 (struct periph_driver **)cdm->pos.cookie.pdrv,
2413                                 xptplistpdrvfunc, cdm);
2414         else
2415                 ret = xptpdrvtraverse(NULL, xptplistpdrvfunc, cdm);
2416
2417         /*
2418          * If we get back 0, that means that we had to stop before fully
2419          * traversing the peripheral driver tree.  It also means that one of
2420          * the subroutines has set the status field to the proper value.  If
2421          * we get back 1, we've fully traversed the EDT and copied out any
2422          * matching entries.
2423          */
2424         if (ret == 1)
2425                 cdm->status = CAM_DEV_MATCH_LAST;
2426
2427         return(ret);
2428 }
2429
2430 static int
2431 xptbustraverse(struct cam_eb *start_bus, xpt_busfunc_t *tr_func, void *arg)
2432 {
2433         struct cam_eb *bus, *next_bus;
2434         int retval;
2435
2436         retval = 1;
2437
2438         for (bus = (start_bus ? start_bus : TAILQ_FIRST(&xpt_busses));
2439              bus != NULL;
2440              bus = next_bus) {
2441                 next_bus = TAILQ_NEXT(bus, links);
2442
2443                 retval = tr_func(bus, arg);
2444                 if (retval == 0)
2445                         return(retval);
2446         }
2447
2448         return(retval);
2449 }
2450
2451 static int
2452 xpttargettraverse(struct cam_eb *bus, struct cam_et *start_target,
2453                   xpt_targetfunc_t *tr_func, void *arg)
2454 {
2455         struct cam_et *target, *next_target;
2456         int retval;
2457
2458         retval = 1;
2459         for (target = (start_target ? start_target :
2460                        TAILQ_FIRST(&bus->et_entries));
2461              target != NULL; target = next_target) {
2462
2463                 next_target = TAILQ_NEXT(target, links);
2464
2465                 retval = tr_func(target, arg);
2466
2467                 if (retval == 0)
2468                         return(retval);
2469         }
2470
2471         return(retval);
2472 }
2473
2474 static int
2475 xptdevicetraverse(struct cam_et *target, struct cam_ed *start_device,
2476                   xpt_devicefunc_t *tr_func, void *arg)
2477 {
2478         struct cam_ed *device, *next_device;
2479         int retval;
2480
2481         retval = 1;
2482         for (device = (start_device ? start_device :
2483                        TAILQ_FIRST(&target->ed_entries));
2484              device != NULL;
2485              device = next_device) {
2486
2487                 next_device = TAILQ_NEXT(device, links);
2488
2489                 retval = tr_func(device, arg);
2490
2491                 if (retval == 0)
2492                         return(retval);
2493         }
2494
2495         return(retval);
2496 }
2497
2498 static int
2499 xptperiphtraverse(struct cam_ed *device, struct cam_periph *start_periph,
2500                   xpt_periphfunc_t *tr_func, void *arg)
2501 {
2502         struct cam_periph *periph, *next_periph;
2503         int retval;
2504
2505         retval = 1;
2506
2507         for (periph = (start_periph ? start_periph :
2508                        SLIST_FIRST(&device->periphs));
2509              periph != NULL;
2510              periph = next_periph) {
2511
2512                 next_periph = SLIST_NEXT(periph, periph_links);
2513
2514                 retval = tr_func(periph, arg);
2515                 if (retval == 0)
2516                         return(retval);
2517         }
2518
2519         return(retval);
2520 }
2521
2522 static int
2523 xptpdrvtraverse(struct periph_driver **start_pdrv,
2524                 xpt_pdrvfunc_t *tr_func, void *arg)
2525 {
2526         struct periph_driver **pdrv;
2527         int retval;
2528
2529         retval = 1;
2530
2531         /*
2532          * We don't traverse the peripheral driver list like we do the
2533          * other lists, because it is a linker set, and therefore cannot be
2534          * changed during runtime.  If the peripheral driver list is ever
2535          * re-done to be something other than a linker set (i.e. it can
2536          * change while the system is running), the list traversal should
2537          * be modified to work like the other traversal functions.
2538          */
2539         SET_FOREACH(pdrv, periphdriver_set) {
2540                 if (start_pdrv == NULL || start_pdrv == pdrv) {
2541                         retval = tr_func(pdrv, arg);
2542                         if (retval == 0)
2543                                 return(retval);
2544                         start_pdrv = NULL; /* traverse remainder */
2545                 }
2546         }
2547         return(retval);
2548 }
2549
2550 static int
2551 xptpdperiphtraverse(struct periph_driver **pdrv,
2552                     struct cam_periph *start_periph,
2553                     xpt_periphfunc_t *tr_func, void *arg)
2554 {
2555         struct cam_periph *periph, *next_periph;
2556         int retval;
2557
2558         retval = 1;
2559
2560         for (periph = (start_periph ? start_periph :
2561              TAILQ_FIRST(&(*pdrv)->units)); periph != NULL;
2562              periph = next_periph) {
2563
2564                 next_periph = TAILQ_NEXT(periph, unit_links);
2565
2566                 retval = tr_func(periph, arg);
2567                 if (retval == 0)
2568                         return(retval);
2569         }
2570         return(retval);
2571 }
2572
2573 static int
2574 xptdefbusfunc(struct cam_eb *bus, void *arg)
2575 {
2576         struct xpt_traverse_config *tr_config;
2577
2578         tr_config = (struct xpt_traverse_config *)arg;
2579
2580         if (tr_config->depth == XPT_DEPTH_BUS) {
2581                 xpt_busfunc_t *tr_func;
2582
2583                 tr_func = (xpt_busfunc_t *)tr_config->tr_func;
2584
2585                 return(tr_func(bus, tr_config->tr_arg));
2586         } else
2587                 return(xpttargettraverse(bus, NULL, xptdeftargetfunc, arg));
2588 }
2589
2590 static int
2591 xptdeftargetfunc(struct cam_et *target, void *arg)
2592 {
2593         struct xpt_traverse_config *tr_config;
2594
2595         tr_config = (struct xpt_traverse_config *)arg;
2596
2597         if (tr_config->depth == XPT_DEPTH_TARGET) {
2598                 xpt_targetfunc_t *tr_func;
2599
2600                 tr_func = (xpt_targetfunc_t *)tr_config->tr_func;
2601
2602                 return(tr_func(target, tr_config->tr_arg));
2603         } else
2604                 return(xptdevicetraverse(target, NULL, xptdefdevicefunc, arg));
2605 }
2606
2607 static int
2608 xptdefdevicefunc(struct cam_ed *device, void *arg)
2609 {
2610         struct xpt_traverse_config *tr_config;
2611
2612         tr_config = (struct xpt_traverse_config *)arg;
2613
2614         if (tr_config->depth == XPT_DEPTH_DEVICE) {
2615                 xpt_devicefunc_t *tr_func;
2616
2617                 tr_func = (xpt_devicefunc_t *)tr_config->tr_func;
2618
2619                 return(tr_func(device, tr_config->tr_arg));
2620         } else
2621                 return(xptperiphtraverse(device, NULL, xptdefperiphfunc, arg));
2622 }
2623
2624 static int
2625 xptdefperiphfunc(struct cam_periph *periph, void *arg)
2626 {
2627         struct xpt_traverse_config *tr_config;
2628         xpt_periphfunc_t *tr_func;
2629
2630         tr_config = (struct xpt_traverse_config *)arg;
2631
2632         tr_func = (xpt_periphfunc_t *)tr_config->tr_func;
2633
2634         /*
2635          * Unlike the other default functions, we don't check for depth
2636          * here.  The peripheral driver level is the last level in the EDT,
2637          * so if we're here, we should execute the function in question.
2638          */
2639         return(tr_func(periph, tr_config->tr_arg));
2640 }
2641
2642 /*
2643  * Execute the given function for every bus in the EDT.
2644  */
2645 static int
2646 xpt_for_all_busses(xpt_busfunc_t *tr_func, void *arg)
2647 {
2648         struct xpt_traverse_config tr_config;
2649
2650         tr_config.depth = XPT_DEPTH_BUS;
2651         tr_config.tr_func = tr_func;
2652         tr_config.tr_arg = arg;
2653
2654         return(xptbustraverse(NULL, xptdefbusfunc, &tr_config));
2655 }
2656
2657 #ifdef notusedyet
2658 /*
2659  * Execute the given function for every target in the EDT.
2660  */
2661 static int
2662 xpt_for_all_targets(xpt_targetfunc_t *tr_func, void *arg)
2663 {
2664         struct xpt_traverse_config tr_config;
2665
2666         tr_config.depth = XPT_DEPTH_TARGET;
2667         tr_config.tr_func = tr_func;
2668         tr_config.tr_arg = arg;
2669
2670         return(xptbustraverse(NULL, xptdefbusfunc, &tr_config));
2671 }
2672 #endif /* notusedyet */
2673
2674 /*
2675  * Execute the given function for every device in the EDT.
2676  */
2677 static int
2678 xpt_for_all_devices(xpt_devicefunc_t *tr_func, void *arg)
2679 {
2680         struct xpt_traverse_config tr_config;
2681
2682         tr_config.depth = XPT_DEPTH_DEVICE;
2683         tr_config.tr_func = tr_func;
2684         tr_config.tr_arg = arg;
2685
2686         return(xptbustraverse(NULL, xptdefbusfunc, &tr_config));
2687 }
2688
2689 #ifdef notusedyet
2690 /*
2691  * Execute the given function for every peripheral in the EDT.
2692  */
2693 static int
2694 xpt_for_all_periphs(xpt_periphfunc_t *tr_func, void *arg)
2695 {
2696         struct xpt_traverse_config tr_config;
2697
2698         tr_config.depth = XPT_DEPTH_PERIPH;
2699         tr_config.tr_func = tr_func;
2700         tr_config.tr_arg = arg;
2701
2702         return(xptbustraverse(NULL, xptdefbusfunc, &tr_config));
2703 }
2704 #endif /* notusedyet */
2705
2706 static int
2707 xptsetasyncfunc(struct cam_ed *device, void *arg)
2708 {
2709         struct cam_path path;
2710         struct ccb_getdev cgd;
2711         struct async_node *cur_entry;
2712
2713         cur_entry = (struct async_node *)arg;
2714
2715         /*
2716          * Don't report unconfigured devices (Wildcard devs,
2717          * devices only for target mode, device instances
2718          * that have been invalidated but are waiting for
2719          * their last reference count to be released).
2720          */
2721         if ((device->flags & CAM_DEV_UNCONFIGURED) != 0)
2722                 return (1);
2723
2724         xpt_compile_path(&path,
2725                          NULL,
2726                          device->target->bus->path_id,
2727                          device->target->target_id,
2728                          device->lun_id);
2729         xpt_setup_ccb(&cgd.ccb_h, &path, /*priority*/1);
2730         cgd.ccb_h.func_code = XPT_GDEV_TYPE;
2731         xpt_action((union ccb *)&cgd);
2732         cur_entry->callback(cur_entry->callback_arg,
2733                             AC_FOUND_DEVICE,
2734                             &path, &cgd);
2735         xpt_release_path(&path);
2736
2737         return(1);
2738 }
2739
2740 static int
2741 xptsetasyncbusfunc(struct cam_eb *bus, void *arg)
2742 {
2743         struct cam_path path;
2744         struct ccb_pathinq cpi;
2745         struct async_node *cur_entry;
2746
2747         cur_entry = (struct async_node *)arg;
2748
2749         xpt_compile_path(&path, /*periph*/NULL,
2750                          bus->sim->path_id,
2751                          CAM_TARGET_WILDCARD,
2752                          CAM_LUN_WILDCARD);
2753         xpt_setup_ccb(&cpi.ccb_h, &path, /*priority*/1);
2754         cpi.ccb_h.func_code = XPT_PATH_INQ;
2755         xpt_action((union ccb *)&cpi);
2756         cur_entry->callback(cur_entry->callback_arg,
2757                             AC_PATH_REGISTERED,
2758                             &path, &cpi);
2759         xpt_release_path(&path);
2760
2761         return(1);
2762 }
2763
2764 void
2765 xpt_action(union ccb *start_ccb)
2766 {
2767         int iopl;
2768
2769         CAM_DEBUG(start_ccb->ccb_h.path, CAM_DEBUG_TRACE, ("xpt_action\n"));
2770
2771         start_ccb->ccb_h.status = CAM_REQ_INPROG;
2772
2773         iopl = splsoftcam();
2774         switch (start_ccb->ccb_h.func_code) {
2775         case XPT_SCSI_IO:
2776         {
2777 #ifdef CAMDEBUG
2778                 char cdb_str[(SCSI_MAX_CDBLEN * 3) + 1];
2779                 struct cam_path *path;
2780
2781                 path = start_ccb->ccb_h.path;
2782 #endif
2783
2784                 /*
2785                  * For the sake of compatibility with SCSI-1
2786                  * devices that may not understand the identify
2787                  * message, we include lun information in the
2788                  * second byte of all commands.  SCSI-1 specifies
2789                  * that luns are a 3 bit value and reserves only 3
2790                  * bits for lun information in the CDB.  Later
2791                  * revisions of the SCSI spec allow for more than 8
2792                  * luns, but have deprecated lun information in the
2793                  * CDB.  So, if the lun won't fit, we must omit.
2794                  *
2795                  * Also be aware that during initial probing for devices,
2796                  * the inquiry information is unknown but initialized to 0.
2797                  * This means that this code will be exercised while probing
2798                  * devices with an ANSI revision greater than 2.
2799                  */
2800                 if (SID_ANSI_REV(&start_ccb->ccb_h.path->device->inq_data) <= 2
2801                  && start_ccb->ccb_h.target_lun < 8
2802                  && (start_ccb->ccb_h.flags & CAM_CDB_POINTER) == 0) {
2803
2804                         start_ccb->csio.cdb_io.cdb_bytes[1] |=
2805                             start_ccb->ccb_h.target_lun << 5;
2806                 }
2807                 start_ccb->csio.scsi_status = SCSI_STATUS_OK;
2808                 CAM_DEBUG(path, CAM_DEBUG_CDB,("%s. CDB: %s\n",
2809                           scsi_op_desc(start_ccb->csio.cdb_io.cdb_bytes[0],
2810                                        &path->device->inq_data),
2811                           scsi_cdb_string(start_ccb->csio.cdb_io.cdb_bytes,
2812                                           cdb_str, sizeof(cdb_str))));
2813                 /* FALLTHROUGH */
2814         }
2815         case XPT_TARGET_IO:
2816         case XPT_CONT_TARGET_IO:
2817                 start_ccb->csio.sense_resid = 0;
2818                 start_ccb->csio.resid = 0;
2819                 /* FALLTHROUGH */
2820         case XPT_RESET_DEV:
2821         case XPT_ENG_EXEC:
2822         {
2823                 struct cam_path *path;
2824                 int s;
2825                 int runq;
2826
2827                 path = start_ccb->ccb_h.path;
2828                 s = splsoftcam();
2829
2830                 cam_ccbq_insert_ccb(&path->device->ccbq, start_ccb);
2831                 if (path->device->qfrozen_cnt == 0)
2832                         runq = xpt_schedule_dev_sendq(path->bus, path->device);
2833                 else
2834                         runq = 0;
2835                 splx(s);
2836                 if (runq != 0)
2837                         xpt_run_dev_sendq(path->bus);
2838                 break;
2839         }
2840         case XPT_SET_TRAN_SETTINGS:
2841         {
2842                 xpt_set_transfer_settings(&start_ccb->cts,
2843                                           start_ccb->ccb_h.path->device,
2844                                           /*async_update*/FALSE);
2845                 break;
2846         }
2847         case XPT_CALC_GEOMETRY:
2848         {
2849                 struct cam_sim *sim;
2850
2851                 /* Filter out garbage */
2852                 if (start_ccb->ccg.block_size == 0
2853                  || start_ccb->ccg.volume_size == 0) {
2854                         start_ccb->ccg.cylinders = 0;
2855                         start_ccb->ccg.heads = 0;
2856                         start_ccb->ccg.secs_per_track = 0;
2857                         start_ccb->ccb_h.status = CAM_REQ_CMP;
2858                         break;
2859                 }
2860 #ifdef PC98
2861                 /*
2862                  * In a PC-98 system, geometry translation depens on
2863                  * the "real" device geometry obtained from mode page 4.
2864                  * SCSI geometry translation is performed in the
2865                  * initialization routine of the SCSI BIOS and the result
2866                  * stored in host memory.  If the translation is available
2867                  * in host memory, use it.  If not, rely on the default
2868                  * translation the device driver performs.
2869                  */
2870                 if (scsi_da_bios_params(&start_ccb->ccg) != 0) {
2871                         start_ccb->ccb_h.status = CAM_REQ_CMP;
2872                         break;
2873                 }
2874 #endif
2875                 sim = start_ccb->ccb_h.path->bus->sim;
2876                 (*(sim->sim_action))(sim, start_ccb);
2877                 break;
2878         }
2879         case XPT_ABORT:
2880         {
2881                 union ccb* abort_ccb;
2882                 int s;                          
2883
2884                 abort_ccb = start_ccb->cab.abort_ccb;
2885                 if (XPT_FC_IS_DEV_QUEUED(abort_ccb)) {
2886
2887                         if (abort_ccb->ccb_h.pinfo.index >= 0) {
2888                                 struct cam_ccbq *ccbq;
2889
2890                                 ccbq = &abort_ccb->ccb_h.path->device->ccbq;
2891                                 cam_ccbq_remove_ccb(ccbq, abort_ccb);
2892                                 abort_ccb->ccb_h.status =
2893                                     CAM_REQ_ABORTED|CAM_DEV_QFRZN;
2894                                 xpt_freeze_devq(abort_ccb->ccb_h.path, 1);
2895                                 s = splcam();
2896                                 xpt_done(abort_ccb);
2897                                 splx(s);
2898                                 start_ccb->ccb_h.status = CAM_REQ_CMP;
2899                                 break;
2900                         }
2901                         if (abort_ccb->ccb_h.pinfo.index == CAM_UNQUEUED_INDEX
2902                          && (abort_ccb->ccb_h.status & CAM_SIM_QUEUED) == 0) {
2903                                 /*
2904                                  * We've caught this ccb en route to
2905                                  * the SIM.  Flag it for abort and the
2906                                  * SIM will do so just before starting
2907                                  * real work on the CCB.
2908                                  */
2909                                 abort_ccb->ccb_h.status =
2910                                     CAM_REQ_ABORTED|CAM_DEV_QFRZN;
2911                                 xpt_freeze_devq(abort_ccb->ccb_h.path, 1);
2912                                 start_ccb->ccb_h.status = CAM_REQ_CMP;
2913                                 break;
2914                         }
2915                 } 
2916                 if (XPT_FC_IS_QUEUED(abort_ccb)
2917                  && (abort_ccb->ccb_h.pinfo.index == CAM_DONEQ_INDEX)) {
2918                         /*
2919                          * It's already completed but waiting
2920                          * for our SWI to get to it.
2921                          */
2922                         start_ccb->ccb_h.status = CAM_UA_ABORT;
2923                         break;
2924                 }
2925                 /*
2926                  * If we weren't able to take care of the abort request
2927                  * in the XPT, pass the request down to the SIM for processing.
2928                  */
2929                 /* FALLTHROUGH */
2930         }
2931         case XPT_ACCEPT_TARGET_IO:
2932         case XPT_EN_LUN:
2933         case XPT_IMMED_NOTIFY:
2934         case XPT_NOTIFY_ACK:
2935         case XPT_GET_TRAN_SETTINGS:
2936         case XPT_RESET_BUS:
2937         {
2938                 struct cam_sim *sim;
2939
2940                 sim = start_ccb->ccb_h.path->bus->sim;
2941                 (*(sim->sim_action))(sim, start_ccb);
2942                 break;
2943         }
2944         case XPT_PATH_INQ:
2945         {
2946                 struct cam_sim *sim;
2947
2948                 sim = start_ccb->ccb_h.path->bus->sim;
2949                 (*(sim->sim_action))(sim, start_ccb);
2950                 break;
2951         }
2952         case XPT_PATH_STATS:
2953                 start_ccb->cpis.last_reset =
2954                         start_ccb->ccb_h.path->bus->last_reset;
2955                 start_ccb->ccb_h.status = CAM_REQ_CMP;
2956                 break;
2957         case XPT_GDEV_TYPE:
2958         {
2959                 struct cam_ed *dev;
2960                 int s;
2961
2962                 dev = start_ccb->ccb_h.path->device;
2963                 s = splcam();
2964                 if ((dev->flags & CAM_DEV_UNCONFIGURED) != 0) {
2965                         start_ccb->ccb_h.status = CAM_DEV_NOT_THERE;
2966                 } else {
2967                         struct ccb_getdev *cgd;
2968                         struct cam_eb *bus;
2969                         struct cam_et *tar;
2970
2971                         cgd = &start_ccb->cgd;
2972                         bus = cgd->ccb_h.path->bus;
2973                         tar = cgd->ccb_h.path->target;
2974                         cgd->inq_data = dev->inq_data;
2975                         cgd->ccb_h.status = CAM_REQ_CMP;
2976                         cgd->serial_num_len = dev->serial_num_len;
2977                         if ((dev->serial_num_len > 0)
2978                          && (dev->serial_num != NULL))
2979                                 bcopy(dev->serial_num, cgd->serial_num,
2980                                       dev->serial_num_len);
2981                 }
2982                 splx(s);
2983                 break; 
2984         }
2985         case XPT_GDEV_STATS:
2986         {
2987                 struct cam_ed *dev;
2988                 int s;
2989
2990                 dev = start_ccb->ccb_h.path->device;
2991                 s = splcam();
2992                 if ((dev->flags & CAM_DEV_UNCONFIGURED) != 0) {
2993                         start_ccb->ccb_h.status = CAM_DEV_NOT_THERE;
2994                 } else {
2995                         struct ccb_getdevstats *cgds;
2996                         struct cam_eb *bus;
2997                         struct cam_et *tar;
2998
2999                         cgds = &start_ccb->cgds;
3000                         bus = cgds->ccb_h.path->bus;
3001                         tar = cgds->ccb_h.path->target;
3002                         cgds->dev_openings = dev->ccbq.dev_openings;
3003                         cgds->dev_active = dev->ccbq.dev_active;
3004                         cgds->devq_openings = dev->ccbq.devq_openings;
3005                         cgds->devq_queued = dev->ccbq.queue.entries;
3006                         cgds->held = dev->ccbq.held;
3007                         cgds->last_reset = tar->last_reset;
3008                         cgds->maxtags = dev->quirk->maxtags;
3009                         cgds->mintags = dev->quirk->mintags;
3010                         if (timevalcmp(&tar->last_reset, &bus->last_reset, <))
3011                                 cgds->last_reset = bus->last_reset;
3012                         cgds->ccb_h.status = CAM_REQ_CMP;
3013                 }
3014                 splx(s);
3015                 break;
3016         }
3017         case XPT_GDEVLIST:
3018         {
3019                 struct cam_periph       *nperiph;
3020                 struct periph_list      *periph_head;
3021                 struct ccb_getdevlist   *cgdl;
3022                 int                     i;
3023                 int                     s;
3024                 struct cam_ed           *device;
3025                 int                     found;
3026
3027
3028                 found = 0;
3029
3030                 /*
3031                  * Don't want anyone mucking with our data.
3032                  */
3033                 s = splcam();
3034                 device = start_ccb->ccb_h.path->device;
3035                 periph_head = &device->periphs;
3036                 cgdl = &start_ccb->cgdl;
3037
3038                 /*
3039                  * Check and see if the list has changed since the user
3040                  * last requested a list member.  If so, tell them that the
3041                  * list has changed, and therefore they need to start over 
3042                  * from the beginning.
3043                  */
3044                 if ((cgdl->index != 0) && 
3045                     (cgdl->generation != device->generation)) {
3046                         cgdl->status = CAM_GDEVLIST_LIST_CHANGED;
3047                         splx(s);
3048                         break;
3049                 }
3050
3051                 /*
3052                  * Traverse the list of peripherals and attempt to find 
3053                  * the requested peripheral.
3054                  */
3055                 for (nperiph = periph_head->slh_first, i = 0;
3056                      (nperiph != NULL) && (i <= cgdl->index);
3057                      nperiph = nperiph->periph_links.sle_next, i++) {
3058                         if (i == cgdl->index) {
3059                                 strncpy(cgdl->periph_name,
3060                                         nperiph->periph_name,
3061                                         DEV_IDLEN);
3062                                 cgdl->unit_number = nperiph->unit_number;
3063                                 found = 1;
3064                         }
3065                 }
3066                 if (found == 0) {
3067                         cgdl->status = CAM_GDEVLIST_ERROR;
3068                         splx(s);
3069                         break;
3070                 }
3071
3072                 if (nperiph == NULL)
3073                         cgdl->status = CAM_GDEVLIST_LAST_DEVICE;
3074                 else
3075                         cgdl->status = CAM_GDEVLIST_MORE_DEVS;
3076
3077                 cgdl->index++;
3078                 cgdl->generation = device->generation;
3079
3080                 splx(s);
3081                 cgdl->ccb_h.status = CAM_REQ_CMP;
3082                 break;
3083         }
3084         case XPT_DEV_MATCH:
3085         {
3086                 int s;
3087                 dev_pos_type position_type;
3088                 struct ccb_dev_match *cdm;
3089                 int ret;
3090
3091                 cdm = &start_ccb->cdm;
3092
3093                 /*
3094                  * Prevent EDT changes while we traverse it.
3095                  */
3096                 s = splcam();
3097                 /*
3098                  * There are two ways of getting at information in the EDT.
3099                  * The first way is via the primary EDT tree.  It starts
3100                  * with a list of busses, then a list of targets on a bus,
3101                  * then devices/luns on a target, and then peripherals on a
3102                  * device/lun.  The "other" way is by the peripheral driver
3103                  * lists.  The peripheral driver lists are organized by
3104                  * peripheral driver.  (obviously)  So it makes sense to
3105                  * use the peripheral driver list if the user is looking
3106                  * for something like "da1", or all "da" devices.  If the
3107                  * user is looking for something on a particular bus/target
3108                  * or lun, it's generally better to go through the EDT tree.
3109                  */
3110
3111                 if (cdm->pos.position_type != CAM_DEV_POS_NONE)
3112                         position_type = cdm->pos.position_type;
3113                 else {
3114                         int i;
3115
3116                         position_type = CAM_DEV_POS_NONE;
3117
3118                         for (i = 0; i < cdm->num_patterns; i++) {
3119                                 if ((cdm->patterns[i].type == DEV_MATCH_BUS)
3120                                  ||(cdm->patterns[i].type == DEV_MATCH_DEVICE)){
3121                                         position_type = CAM_DEV_POS_EDT;
3122                                         break;
3123                                 }
3124                         }
3125
3126                         if (cdm->num_patterns == 0)
3127                                 position_type = CAM_DEV_POS_EDT;
3128                         else if (position_type == CAM_DEV_POS_NONE)
3129                                 position_type = CAM_DEV_POS_PDRV;
3130                 }
3131
3132                 switch(position_type & CAM_DEV_POS_TYPEMASK) {
3133                 case CAM_DEV_POS_EDT:
3134                         ret = xptedtmatch(cdm);
3135                         break;
3136                 case CAM_DEV_POS_PDRV:
3137                         ret = xptperiphlistmatch(cdm);
3138                         break;
3139                 default:
3140                         cdm->status = CAM_DEV_MATCH_ERROR;
3141                         break;
3142                 }
3143
3144                 splx(s);
3145
3146                 if (cdm->status == CAM_DEV_MATCH_ERROR)
3147                         start_ccb->ccb_h.status = CAM_REQ_CMP_ERR;
3148                 else
3149                         start_ccb->ccb_h.status = CAM_REQ_CMP;
3150
3151                 break;
3152         }
3153         case XPT_SASYNC_CB:
3154         {
3155                 struct ccb_setasync *csa;
3156                 struct async_node *cur_entry;
3157                 struct async_list *async_head;
3158                 u_int32_t added;
3159                 int s;
3160
3161                 csa = &start_ccb->csa;
3162                 added = csa->event_enable;
3163                 async_head = &csa->ccb_h.path->device->asyncs;
3164
3165                 /*
3166                  * If there is already an entry for us, simply
3167                  * update it.
3168                  */
3169                 s = splcam();
3170                 cur_entry = SLIST_FIRST(async_head);
3171                 while (cur_entry != NULL) {
3172                         if ((cur_entry->callback_arg == csa->callback_arg)
3173                          && (cur_entry->callback == csa->callback))
3174                                 break;
3175                         cur_entry = SLIST_NEXT(cur_entry, links);
3176                 }
3177
3178                 if (cur_entry != NULL) {
3179                         /*
3180                          * If the request has no flags set,
3181                          * remove the entry.
3182                          */
3183                         added &= ~cur_entry->event_enable;
3184                         if (csa->event_enable == 0) {
3185                                 SLIST_REMOVE(async_head, cur_entry,
3186                                              async_node, links);
3187                                 csa->ccb_h.path->device->refcount--;
3188                                 free(cur_entry, M_DEVBUF);
3189                         } else {
3190                                 cur_entry->event_enable = csa->event_enable;
3191                         }
3192                 } else {
3193                         cur_entry = malloc(sizeof(*cur_entry), M_DEVBUF,
3194                                            M_NOWAIT);
3195                         if (cur_entry == NULL) {
3196                                 splx(s);
3197                                 csa->ccb_h.status = CAM_RESRC_UNAVAIL;
3198                                 break;
3199                         }
3200                         cur_entry->event_enable = csa->event_enable;
3201                         cur_entry->callback_arg = csa->callback_arg;
3202                         cur_entry->callback = csa->callback;
3203                         SLIST_INSERT_HEAD(async_head, cur_entry, links);
3204                         csa->ccb_h.path->device->refcount++;
3205                 }
3206
3207                 if ((added & AC_FOUND_DEVICE) != 0) {
3208                         /*
3209                          * Get this peripheral up to date with all
3210                          * the currently existing devices.
3211                          */
3212                         xpt_for_all_devices(xptsetasyncfunc, cur_entry);
3213                 }
3214                 if ((added & AC_PATH_REGISTERED) != 0) {
3215                         /*
3216                          * Get this peripheral up to date with all
3217                          * the currently existing busses.
3218                          */
3219                         xpt_for_all_busses(xptsetasyncbusfunc, cur_entry);
3220                 }
3221                 splx(s);
3222                 start_ccb->ccb_h.status = CAM_REQ_CMP;
3223                 break;
3224         }
3225         case XPT_REL_SIMQ:
3226         {
3227                 struct ccb_relsim *crs;
3228                 struct cam_ed *dev;
3229                 int s;
3230
3231                 crs = &start_ccb->crs;
3232                 dev = crs->ccb_h.path->device;
3233                 if (dev == NULL) {
3234
3235                         crs->ccb_h.status = CAM_DEV_NOT_THERE;
3236                         break;
3237                 }
3238
3239                 s = splcam();
3240
3241                 if ((crs->release_flags & RELSIM_ADJUST_OPENINGS) != 0) {
3242
3243                         if ((dev->inq_data.flags & SID_CmdQue) != 0) {
3244
3245                                 /* Don't ever go below one opening */
3246                                 if (crs->openings > 0) {
3247                                         xpt_dev_ccbq_resize(crs->ccb_h.path,
3248                                                             crs->openings);
3249
3250                                         if (bootverbose) {
3251                                                 xpt_print_path(crs->ccb_h.path);
3252                                                 printf("tagged openings "
3253                                                        "now %d\n",
3254                                                        crs->openings);
3255                                         }
3256                                 }
3257                         }
3258                 }
3259
3260                 if ((crs->release_flags & RELSIM_RELEASE_AFTER_TIMEOUT) != 0) {
3261
3262                         if ((dev->flags & CAM_DEV_REL_TIMEOUT_PENDING) != 0) {
3263
3264                                 /*
3265                                  * Just extend the old timeout and decrement
3266                                  * the freeze count so that a single timeout
3267                                  * is sufficient for releasing the queue.
3268                                  */
3269                                 start_ccb->ccb_h.flags &= ~CAM_DEV_QFREEZE;
3270                                 untimeout(xpt_release_devq_timeout,
3271                                           dev, dev->c_handle);
3272                         } else {
3273
3274                                 start_ccb->ccb_h.flags |= CAM_DEV_QFREEZE;
3275                         }
3276
3277                         dev->c_handle =
3278                                 timeout(xpt_release_devq_timeout,
3279                                         dev,
3280                                         (crs->release_timeout * hz) / 1000);
3281
3282                         dev->flags |= CAM_DEV_REL_TIMEOUT_PENDING;
3283
3284                 }
3285
3286                 if ((crs->release_flags & RELSIM_RELEASE_AFTER_CMDCMPLT) != 0) {
3287
3288                         if ((dev->flags & CAM_DEV_REL_ON_COMPLETE) != 0) {
3289                                 /*
3290                                  * Decrement the freeze count so that a single
3291                                  * completion is still sufficient to unfreeze
3292                                  * the queue.
3293                                  */
3294                                 start_ccb->ccb_h.flags &= ~CAM_DEV_QFREEZE;
3295                         } else {
3296                                 
3297                                 dev->flags |= CAM_DEV_REL_ON_COMPLETE;
3298                                 start_ccb->ccb_h.flags |= CAM_DEV_QFREEZE;
3299                         }
3300                 }
3301
3302                 if ((crs->release_flags & RELSIM_RELEASE_AFTER_QEMPTY) != 0) {
3303
3304                         if ((dev->flags & CAM_DEV_REL_ON_QUEUE_EMPTY) != 0
3305                          || (dev->ccbq.dev_active == 0)) {
3306
3307                                 start_ccb->ccb_h.flags &= ~CAM_DEV_QFREEZE;
3308                         } else {
3309                                 
3310                                 dev->flags |= CAM_DEV_REL_ON_QUEUE_EMPTY;
3311                                 start_ccb->ccb_h.flags |= CAM_DEV_QFREEZE;
3312                         }
3313                 }
3314                 splx(s);
3315                 
3316                 if ((start_ccb->ccb_h.flags & CAM_DEV_QFREEZE) == 0) {
3317
3318                         xpt_release_devq(crs->ccb_h.path, /*count*/1,
3319                                          /*run_queue*/TRUE);
3320                 }
3321                 start_ccb->crs.qfrozen_cnt = dev->qfrozen_cnt;
3322                 start_ccb->ccb_h.status = CAM_REQ_CMP;
3323                 break;
3324         }
3325         case XPT_SCAN_BUS:
3326                 xpt_scan_bus(start_ccb->ccb_h.path->periph, start_ccb);
3327                 break;
3328         case XPT_SCAN_LUN:
3329                 xpt_scan_lun(start_ccb->ccb_h.path->periph,
3330                              start_ccb->ccb_h.path, start_ccb->crcn.flags,
3331                              start_ccb);
3332                 break;
3333         case XPT_DEBUG: {
3334 #ifdef CAMDEBUG
3335                 int s;
3336                 
3337                 s = splcam();
3338 #ifdef CAM_DEBUG_DELAY
3339                 cam_debug_delay = CAM_DEBUG_DELAY;
3340 #endif
3341                 cam_dflags = start_ccb->cdbg.flags;
3342                 if (cam_dpath != NULL) {
3343                         xpt_free_path(cam_dpath);
3344                         cam_dpath = NULL;
3345                 }
3346
3347                 if (cam_dflags != CAM_DEBUG_NONE) {
3348                         if (xpt_create_path(&cam_dpath, xpt_periph,
3349                                             start_ccb->ccb_h.path_id,
3350                                             start_ccb->ccb_h.target_id,
3351                                             start_ccb->ccb_h.target_lun) !=
3352                                             CAM_REQ_CMP) {
3353                                 start_ccb->ccb_h.status = CAM_RESRC_UNAVAIL;
3354                                 cam_dflags = CAM_DEBUG_NONE;
3355                         } else {
3356                                 start_ccb->ccb_h.status = CAM_REQ_CMP;
3357                                 xpt_print_path(cam_dpath);
3358                                 printf("debugging flags now %x\n", cam_dflags);
3359                         }
3360                 } else {
3361                         cam_dpath = NULL;
3362                         start_ccb->ccb_h.status = CAM_REQ_CMP;
3363                 }
3364                 splx(s);
3365 #else /* !CAMDEBUG */
3366                 start_ccb->ccb_h.status = CAM_FUNC_NOTAVAIL;
3367 #endif /* CAMDEBUG */
3368                 break;
3369         }
3370         case XPT_NOOP:
3371                 if ((start_ccb->ccb_h.flags & CAM_DEV_QFREEZE) != 0)
3372                         xpt_freeze_devq(start_ccb->ccb_h.path, 1);
3373                 start_ccb->ccb_h.status = CAM_REQ_CMP;
3374                 break;
3375         default:
3376         case XPT_SDEV_TYPE:
3377         case XPT_TERM_IO:
3378         case XPT_ENG_INQ:
3379                 /* XXX Implement */
3380                 start_ccb->ccb_h.status = CAM_PROVIDE_FAIL;
3381                 break;
3382         }
3383         splx(iopl);
3384 }
3385
3386 void
3387 xpt_polled_action(union ccb *start_ccb)
3388 {
3389         int       s;
3390         u_int32_t timeout;
3391         struct    cam_sim *sim; 
3392         struct    cam_devq *devq;
3393         struct    cam_ed *dev;
3394
3395         timeout = start_ccb->ccb_h.timeout;
3396         sim = start_ccb->ccb_h.path->bus->sim;
3397         devq = sim->devq;
3398         dev = start_ccb->ccb_h.path->device;
3399
3400         s = splcam();
3401
3402         /*
3403          * Steal an opening so that no other queued requests
3404          * can get it before us while we simulate interrupts.
3405          */
3406         dev->ccbq.devq_openings--;
3407         dev->ccbq.dev_openings--;       
3408         
3409         while((devq->send_openings <= 0 || dev->ccbq.dev_openings < 0)
3410            && (--timeout > 0)) {
3411                 DELAY(1000);
3412                 (*(sim->sim_poll))(sim);
3413                 swi_camnet(NULL);
3414                 swi_cambio(NULL);               
3415         }
3416         
3417         dev->ccbq.devq_openings++;
3418         dev->ccbq.dev_openings++;
3419         
3420         if (timeout != 0) {
3421                 xpt_action(start_ccb);
3422                 while(--timeout > 0) {
3423                         (*(sim->sim_poll))(sim);
3424                         swi_camnet(NULL);
3425                         swi_cambio(NULL);
3426                         if ((start_ccb->ccb_h.status  & CAM_STATUS_MASK)
3427                             != CAM_REQ_INPROG)
3428                                 break;
3429                         DELAY(1000);
3430                 }
3431                 if (timeout == 0) {
3432                         /*
3433                          * XXX Is it worth adding a sim_timeout entry
3434                          * point so we can attempt recovery?  If
3435                          * this is only used for dumps, I don't think
3436                          * it is.
3437                          */
3438                         start_ccb->ccb_h.status = CAM_CMD_TIMEOUT;
3439                 }
3440         } else {
3441                 start_ccb->ccb_h.status = CAM_RESRC_UNAVAIL;
3442         }
3443         splx(s);
3444 }
3445         
3446 /*
3447  * Schedule a peripheral driver to receive a ccb when it's
3448  * target device has space for more transactions.
3449  */
3450 void
3451 xpt_schedule(struct cam_periph *perph, u_int32_t new_priority)
3452 {
3453         struct cam_ed *device;
3454         int s;
3455         int runq;
3456
3457         CAM_DEBUG(perph->path, CAM_DEBUG_TRACE, ("xpt_schedule\n"));
3458         device = perph->path->device;
3459         s = splsoftcam();
3460         if (periph_is_queued(perph)) {
3461                 /* Simply reorder based on new priority */
3462                 CAM_DEBUG(perph->path, CAM_DEBUG_SUBTRACE,
3463                           ("   change priority to %d\n", new_priority));
3464                 if (new_priority < perph->pinfo.priority) {
3465                         camq_change_priority(&device->drvq,
3466                                              perph->pinfo.index,
3467                                              new_priority);
3468                 }
3469                 runq = 0;
3470         } else {
3471                 /* New entry on the queue */
3472                 CAM_DEBUG(perph->path, CAM_DEBUG_SUBTRACE,
3473                           ("   added periph to queue\n"));
3474                 perph->pinfo.priority = new_priority;
3475                 perph->pinfo.generation = ++device->drvq.generation;
3476                 camq_insert(&device->drvq, &perph->pinfo);
3477                 runq = xpt_schedule_dev_allocq(perph->path->bus, device);
3478         }
3479         splx(s);
3480         if (runq != 0) {
3481                 CAM_DEBUG(perph->path, CAM_DEBUG_SUBTRACE,
3482                           ("   calling xpt_run_devq\n"));
3483                 xpt_run_dev_allocq(perph->path->bus);
3484         }
3485 }
3486
3487
3488 /*
3489  * Schedule a device to run on a given queue.
3490  * If the device was inserted as a new entry on the queue,
3491  * return 1 meaning the device queue should be run. If we
3492  * were already queued, implying someone else has already
3493  * started the queue, return 0 so the caller doesn't attempt
3494  * to run the queue.  Must be run at either splsoftcam
3495  * (or splcam since that encompases splsoftcam).
3496  */
3497 static int
3498 xpt_schedule_dev(struct camq *queue, cam_pinfo *pinfo,
3499                  u_int32_t new_priority)
3500 {
3501         int retval;
3502         u_int32_t old_priority;
3503
3504         CAM_DEBUG_PRINT(CAM_DEBUG_XPT, ("xpt_schedule_dev\n"));
3505
3506         old_priority = pinfo->priority;
3507
3508         /*
3509          * Are we already queued?
3510          */
3511         if (pinfo->index != CAM_UNQUEUED_INDEX) {
3512                 /* Simply reorder based on new priority */
3513                 if (new_priority < old_priority) {
3514                         camq_change_priority(queue, pinfo->index,
3515                                              new_priority);
3516                         CAM_DEBUG_PRINT(CAM_DEBUG_XPT,
3517                                         ("changed priority to %d\n",
3518                                          new_priority));
3519                 }
3520                 retval = 0;
3521         } else {
3522                 /* New entry on the queue */
3523                 if (new_priority < old_priority)
3524                         pinfo->priority = new_priority;
3525
3526                 CAM_DEBUG_PRINT(CAM_DEBUG_XPT,
3527                                 ("Inserting onto queue\n"));
3528                 pinfo->generation = ++queue->generation;
3529                 camq_insert(queue, pinfo);
3530                 retval = 1;
3531         }
3532         return (retval);
3533 }
3534
3535 static void
3536 xpt_run_dev_allocq(struct cam_eb *bus)
3537 {
3538         struct  cam_devq *devq;
3539         int     s;
3540
3541         CAM_DEBUG_PRINT(CAM_DEBUG_XPT, ("xpt_run_dev_allocq\n"));
3542         devq = bus->sim->devq;
3543
3544         CAM_DEBUG_PRINT(CAM_DEBUG_XPT,
3545                         ("   qfrozen_cnt == 0x%x, entries == %d, "
3546                          "openings == %d, active == %d\n",
3547                          devq->alloc_queue.qfrozen_cnt,
3548                          devq->alloc_queue.entries,
3549                          devq->alloc_openings,
3550                          devq->alloc_active));
3551
3552         s = splsoftcam();
3553         devq->alloc_queue.qfrozen_cnt++;
3554         while ((devq->alloc_queue.entries > 0)
3555             && (devq->alloc_openings > 0)
3556             && (devq->alloc_queue.qfrozen_cnt <= 1)) {
3557                 struct  cam_ed_qinfo *qinfo;
3558                 struct  cam_ed *device;
3559                 union   ccb *work_ccb;
3560                 struct  cam_periph *drv;
3561                 struct  camq *drvq;
3562                 
3563                 qinfo = (struct cam_ed_qinfo *)camq_remove(&devq->alloc_queue,
3564                                                            CAMQ_HEAD);
3565                 device = qinfo->device;
3566
3567                 CAM_DEBUG_PRINT(CAM_DEBUG_XPT,
3568                                 ("running device %p\n", device));
3569
3570                 drvq = &device->drvq;
3571
3572 #ifdef CAMDEBUG
3573                 if (drvq->entries <= 0) {
3574                         panic("xpt_run_dev_allocq: "
3575                               "Device on queue without any work to do");
3576                 }
3577 #endif
3578                 if ((work_ccb = xpt_get_ccb(device)) != NULL) {
3579                         devq->alloc_openings--;
3580                         devq->alloc_active++;
3581                         drv = (struct cam_periph*)camq_remove(drvq, CAMQ_HEAD);
3582                         splx(s);
3583                         xpt_setup_ccb(&work_ccb->ccb_h, drv->path,
3584                                       drv->pinfo.priority);
3585                         CAM_DEBUG_PRINT(CAM_DEBUG_XPT,
3586                                         ("calling periph start\n"));
3587                         drv->periph_start(drv, work_ccb);
3588                 } else {
3589                         /*
3590                          * Malloc failure in alloc_ccb
3591                          */
3592                         /*
3593                          * XXX add us to a list to be run from free_ccb
3594                          * if we don't have any ccbs active on this
3595                          * device queue otherwise we may never get run
3596                          * again.
3597                          */
3598                         break;
3599                 }
3600         
3601                 /* Raise IPL for possible insertion and test at top of loop */
3602                 s = splsoftcam();
3603
3604                 if (drvq->entries > 0) {
3605                         /* We have more work.  Attempt to reschedule */
3606                         xpt_schedule_dev_allocq(bus, device);
3607                 }
3608         }
3609         devq->alloc_queue.qfrozen_cnt--;
3610         splx(s);
3611 }
3612
3613 static void
3614 xpt_run_dev_sendq(struct cam_eb *bus)
3615 {
3616         struct  cam_devq *devq;
3617         int     s;
3618
3619         CAM_DEBUG_PRINT(CAM_DEBUG_XPT, ("xpt_run_dev_sendq\n"));
3620         
3621         devq = bus->sim->devq;
3622
3623         s = splcam();
3624         devq->send_queue.qfrozen_cnt++;
3625         splx(s);
3626         s = splsoftcam();
3627         while ((devq->send_queue.entries > 0)
3628             && (devq->send_openings > 0)) {
3629                 struct  cam_ed_qinfo *qinfo;
3630                 struct  cam_ed *device;
3631                 union ccb *work_ccb;
3632                 struct  cam_sim *sim;
3633                 int     ospl;
3634
3635                 ospl = splcam();
3636                 if (devq->send_queue.qfrozen_cnt > 1) {
3637                         splx(ospl);
3638                         break;
3639                 }
3640
3641                 qinfo = (struct cam_ed_qinfo *)camq_remove(&devq->send_queue,
3642                                                            CAMQ_HEAD);
3643                 device = qinfo->device;
3644
3645                 /*
3646                  * If the device has been "frozen", don't attempt
3647                  * to run it.
3648                  */
3649                 if (device->qfrozen_cnt > 0) {
3650                         splx(ospl);
3651                         continue;
3652                 }
3653
3654                 CAM_DEBUG_PRINT(CAM_DEBUG_XPT,
3655                                 ("running device %p\n", device));
3656
3657                 work_ccb = cam_ccbq_peek_ccb(&device->ccbq, CAMQ_HEAD);
3658                 if (work_ccb == NULL) {
3659                         printf("device on run queue with no ccbs???\n");
3660                         splx(ospl);
3661                         continue;
3662                 }
3663
3664                 if ((work_ccb->ccb_h.flags & CAM_HIGH_POWER) != 0) {
3665
3666                         if (num_highpower <= 0) {
3667                                 /*
3668                                  * We got a high power command, but we
3669                                  * don't have any available slots.  Freeze
3670                                  * the device queue until we have a slot
3671                                  * available.
3672                                  */
3673                                 device->qfrozen_cnt++;
3674                                 STAILQ_INSERT_TAIL(&highpowerq, 
3675                                                    &work_ccb->ccb_h, 
3676                                                    xpt_links.stqe);
3677
3678                                 splx(ospl);
3679                                 continue;
3680                         } else {
3681                                 /*
3682                                  * Consume a high power slot while
3683                                  * this ccb runs.
3684                                  */
3685                                 num_highpower--;
3686                         }
3687                 }
3688                 devq->active_dev = device;
3689                 cam_ccbq_remove_ccb(&device->ccbq, work_ccb);
3690
3691                 cam_ccbq_send_ccb(&device->ccbq, work_ccb);
3692                 splx(ospl);
3693
3694                 devq->send_openings--;
3695                 devq->send_active++;            
3696                 
3697                 if (device->ccbq.queue.entries > 0)
3698                         xpt_schedule_dev_sendq(bus, device);
3699
3700                 if (work_ccb && (work_ccb->ccb_h.flags & CAM_DEV_QFREEZE) != 0){
3701                         /*
3702                          * The client wants to freeze the queue
3703                          * after this CCB is sent.
3704                          */
3705                         ospl = splcam();
3706                         device->qfrozen_cnt++;
3707                         splx(ospl);
3708                 }
3709                 
3710                 splx(s);
3711
3712                 /* In Target mode, the peripheral driver knows best... */
3713                 if (work_ccb->ccb_h.func_code == XPT_SCSI_IO) {
3714                         if ((device->inq_flags & SID_CmdQue) != 0
3715                          && work_ccb->csio.tag_action != CAM_TAG_ACTION_NONE)
3716                                 work_ccb->ccb_h.flags |= CAM_TAG_ACTION_VALID;
3717                         else
3718                                 /*
3719                                  * Clear this in case of a retried CCB that
3720                                  * failed due to a rejected tag.
3721                                  */
3722                                 work_ccb->ccb_h.flags &= ~CAM_TAG_ACTION_VALID;
3723                 }
3724
3725                 /*
3726                  * Device queues can be shared among multiple sim instances
3727                  * that reside on different busses.  Use the SIM in the queue
3728                  * CCB's path, rather than the one in the bus that was passed
3729                  * into this function.
3730                  */
3731                 sim = work_ccb->ccb_h.path->bus->sim;
3732                 (*(sim->sim_action))(sim, work_ccb);
3733
3734                 ospl = splcam();
3735                 devq->active_dev = NULL;
3736                 splx(ospl);
3737                 /* Raise IPL for possible insertion and test at top of loop */
3738                 s = splsoftcam();
3739         }
3740         splx(s);
3741         s = splcam();
3742         devq->send_queue.qfrozen_cnt--;
3743         splx(s);
3744 }
3745
3746 /*
3747  * This function merges stuff from the slave ccb into the master ccb, while
3748  * keeping important fields in the master ccb constant.
3749  */
3750 void
3751 xpt_merge_ccb(union ccb *master_ccb, union ccb *slave_ccb)
3752 {
3753         /*
3754          * Pull fields that are valid for peripheral drivers to set
3755          * into the master CCB along with the CCB "payload".
3756          */
3757         master_ccb->ccb_h.retry_count = slave_ccb->ccb_h.retry_count;
3758         master_ccb->ccb_h.func_code = slave_ccb->ccb_h.func_code;
3759         master_ccb->ccb_h.timeout = slave_ccb->ccb_h.timeout;
3760         master_ccb->ccb_h.flags = slave_ccb->ccb_h.flags;
3761         bcopy(&(&slave_ccb->ccb_h)[1], &(&master_ccb->ccb_h)[1],
3762               sizeof(union ccb) - sizeof(struct ccb_hdr));
3763 }
3764
3765 void
3766 xpt_setup_ccb(struct ccb_hdr *ccb_h, struct cam_path *path, u_int32_t priority)
3767 {
3768         CAM_DEBUG(path, CAM_DEBUG_TRACE, ("xpt_setup_ccb\n"));
3769         ccb_h->pinfo.priority = priority;
3770         ccb_h->path = path;
3771         ccb_h->path_id = path->bus->path_id;
3772         if (path->target)
3773                 ccb_h->target_id = path->target->target_id;
3774         else
3775                 ccb_h->target_id = CAM_TARGET_WILDCARD;
3776         if (path->device) {
3777                 ccb_h->target_lun = path->device->lun_id;
3778                 ccb_h->pinfo.generation = ++path->device->ccbq.queue.generation;
3779         } else {
3780                 ccb_h->target_lun = CAM_TARGET_WILDCARD;
3781         }
3782         ccb_h->pinfo.index = CAM_UNQUEUED_INDEX;
3783         ccb_h->flags = 0;
3784 }
3785
3786 /* Path manipulation functions */
3787 cam_status
3788 xpt_create_path(struct cam_path **new_path_ptr, struct cam_periph *perph,
3789                 path_id_t path_id, target_id_t target_id, lun_id_t lun_id)
3790 {
3791         struct     cam_path *path;
3792         cam_status status;
3793
3794     &nbs