* Move function types to a separate line.
[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 1.28 2006/01/22 14:03:51 swildner 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 #include <sys/thread.h>
45 #include <sys/thread2.h>
46
47 #include <machine/clock.h>
48 #include <machine/ipl.h>
49
50 #include "cam.h"
51 #include "cam_ccb.h"
52 #include "cam_periph.h"
53 #include "cam_sim.h"
54 #include "cam_xpt.h"
55 #include "cam_xpt_sim.h"
56 #include "cam_xpt_periph.h"
57 #include "cam_debug.h"
58
59 #include "scsi/scsi_all.h"
60 #include "scsi/scsi_message.h"
61 #include "scsi/scsi_pass.h"
62 #include "opt_cam.h"
63
64 /* Datastructures internal to the xpt layer */
65
66 /*
67  * Definition of an async handler callback block.  These are used to add
68  * SIMs and peripherals to the async callback lists.
69  */
70 struct async_node {
71         SLIST_ENTRY(async_node) links;
72         u_int32_t       event_enable;   /* Async Event enables */
73         void            (*callback)(void *arg, u_int32_t code,
74                                     struct cam_path *path, void *args);
75         void            *callback_arg;
76 };
77
78 SLIST_HEAD(async_list, async_node);
79 SLIST_HEAD(periph_list, cam_periph);
80 static STAILQ_HEAD(highpowerlist, ccb_hdr) highpowerq;
81
82 /*
83  * This is the maximum number of high powered commands (e.g. start unit)
84  * that can be outstanding at a particular time.
85  */
86 #ifndef CAM_MAX_HIGHPOWER
87 #define CAM_MAX_HIGHPOWER  4
88 #endif
89
90 /* number of high powered commands that can go through right now */
91 static int num_highpower = CAM_MAX_HIGHPOWER;
92
93 /*
94  * Structure for queueing a device in a run queue.
95  * There is one run queue for allocating new ccbs,
96  * and another for sending ccbs to the controller.
97  */
98 struct cam_ed_qinfo {
99         cam_pinfo pinfo;
100         struct    cam_ed *device;
101 };
102
103 /*
104  * The CAM EDT (Existing Device Table) contains the device information for
105  * all devices for all busses in the system.  The table contains a
106  * cam_ed structure for each device on the bus.
107  */
108 struct cam_ed {
109         TAILQ_ENTRY(cam_ed) links;
110         struct  cam_ed_qinfo alloc_ccb_entry;
111         struct  cam_ed_qinfo send_ccb_entry;
112         struct  cam_et   *target;
113         lun_id_t         lun_id;
114         struct  camq drvq;              /*
115                                          * Queue of type drivers wanting to do
116                                          * work on this device.
117                                          */
118         struct  cam_ccbq ccbq;          /* Queue of pending ccbs */
119         struct  async_list asyncs;      /* Async callback info for this B/T/L */
120         struct  periph_list periphs;    /* All attached devices */
121         u_int   generation;             /* Generation number */
122         struct  cam_periph *owner;      /* Peripheral driver's ownership tag */
123         struct  xpt_quirk_entry *quirk; /* Oddities about this device */
124                                         /* Storage for the inquiry data */
125         struct  scsi_inquiry_data inq_data;
126         u_int8_t         inq_flags;     /*
127                                          * Current settings for inquiry flags.
128                                          * This allows us to override settings
129                                          * like disconnection and tagged
130                                          * queuing for a device.
131                                          */
132         u_int8_t         queue_flags;   /* Queue flags from the control page */
133         u_int8_t         serial_num_len;
134         u_int8_t         *serial_num;
135         u_int32_t        qfrozen_cnt;
136         u_int32_t        flags;
137 #define CAM_DEV_UNCONFIGURED            0x01
138 #define CAM_DEV_REL_TIMEOUT_PENDING     0x02
139 #define CAM_DEV_REL_ON_COMPLETE         0x04
140 #define CAM_DEV_REL_ON_QUEUE_EMPTY      0x08
141 #define CAM_DEV_RESIZE_QUEUE_NEEDED     0x10
142 #define CAM_DEV_TAG_AFTER_COUNT         0x20
143 #define CAM_DEV_INQUIRY_DATA_VALID      0x40
144         u_int32_t        tag_delay_count;
145 #define CAM_TAG_DELAY_COUNT             5
146         u_int32_t        refcount;
147         struct           callout c_handle;
148 };
149
150 /*
151  * Each target is represented by an ET (Existing Target).  These
152  * entries are created when a target is successfully probed with an
153  * identify, and removed when a device fails to respond after a number
154  * of retries, or a bus rescan finds the device missing.
155  */
156 struct cam_et { 
157         TAILQ_HEAD(, cam_ed) ed_entries;
158         TAILQ_ENTRY(cam_et) links;
159         struct  cam_eb  *bus;   
160         target_id_t     target_id;
161         u_int32_t       refcount;       
162         u_int           generation;
163         struct          timeval last_reset;     /* uptime of last reset */
164 };
165
166 /*
167  * Each bus is represented by an EB (Existing Bus).  These entries
168  * are created by calls to xpt_bus_register and deleted by calls to
169  * xpt_bus_deregister.
170  */
171 struct cam_eb { 
172         TAILQ_HEAD(, cam_et) et_entries;
173         TAILQ_ENTRY(cam_eb)  links;
174         path_id_t            path_id;
175         struct cam_sim       *sim;
176         struct timeval       last_reset;        /* uptime of last reset */
177         u_int32_t            flags;
178 #define CAM_EB_RUNQ_SCHEDULED   0x01
179         u_int32_t            refcount;
180         u_int                generation;
181 };
182
183 struct cam_path {
184         struct cam_periph *periph;
185         struct cam_eb     *bus;
186         struct cam_et     *target;
187         struct cam_ed     *device;
188 };
189
190 struct xpt_quirk_entry {
191         struct scsi_inquiry_pattern inq_pat;
192         u_int8_t quirks;
193 #define CAM_QUIRK_NOLUNS        0x01
194 #define CAM_QUIRK_NOSERIAL      0x02
195 #define CAM_QUIRK_HILUNS        0x04
196         u_int mintags;
197         u_int maxtags;
198 };
199 #define CAM_SCSI2_MAXLUN        8
200
201 typedef enum {
202         XPT_FLAG_OPEN           = 0x01
203 } xpt_flags;
204
205 struct xpt_softc {
206         xpt_flags       flags;
207         u_int32_t       generation;
208 };
209
210 static const char quantum[] = "QUANTUM";
211 static const char sony[] = "SONY";
212 static const char west_digital[] = "WDIGTL";
213 static const char samsung[] = "SAMSUNG";
214 static const char seagate[] = "SEAGATE";
215 static const char microp[] = "MICROP";
216
217 static struct xpt_quirk_entry xpt_quirk_table[] = 
218 {
219         {
220                 /* Reports QUEUE FULL for temporary resource shortages */
221                 { T_DIRECT, SIP_MEDIA_FIXED, quantum, "XP39100*", "*" },
222                 /*quirks*/0, /*mintags*/24, /*maxtags*/32
223         },
224         {
225                 /* Reports QUEUE FULL for temporary resource shortages */
226                 { T_DIRECT, SIP_MEDIA_FIXED, quantum, "XP34550*", "*" },
227                 /*quirks*/0, /*mintags*/24, /*maxtags*/32
228         },
229         {
230                 /* Reports QUEUE FULL for temporary resource shortages */
231                 { T_DIRECT, SIP_MEDIA_FIXED, quantum, "XP32275*", "*" },
232                 /*quirks*/0, /*mintags*/24, /*maxtags*/32
233         },
234         {
235                 /* Broken tagged queuing drive */
236                 { T_DIRECT, SIP_MEDIA_FIXED, microp, "4421-07*", "*" },
237                 /*quirks*/0, /*mintags*/0, /*maxtags*/0
238         },
239         {
240                 /* Broken tagged queuing drive */
241                 { T_DIRECT, SIP_MEDIA_FIXED, "HP", "C372*", "*" },
242                 /*quirks*/0, /*mintags*/0, /*maxtags*/0
243         },
244         {
245                 /* Broken tagged queuing drive */
246                 { T_DIRECT, SIP_MEDIA_FIXED, microp, "3391*", "x43h" },
247                 /*quirks*/0, /*mintags*/0, /*maxtags*/0
248         },
249         {
250                 /*
251                  * Unfortunately, the Quantum Atlas III has the same
252                  * problem as the Atlas II drives above.
253                  * Reported by: "Johan Granlund" <johan@granlund.nu>
254                  *
255                  * For future reference, the drive with the problem was:
256                  * QUANTUM QM39100TD-SW N1B0
257                  * 
258                  * It's possible that Quantum will fix the problem in later
259                  * firmware revisions.  If that happens, the quirk entry
260                  * will need to be made specific to the firmware revisions
261                  * with the problem.
262                  * 
263                  */
264                 /* Reports QUEUE FULL for temporary resource shortages */
265                 { T_DIRECT, SIP_MEDIA_FIXED, quantum, "QM39100*", "*" },
266                 /*quirks*/0, /*mintags*/24, /*maxtags*/32
267         },
268         {
269                 /*
270                  * 18 Gig Atlas III, same problem as the 9G version.
271                  * Reported by: Andre Albsmeier
272                  *              <andre.albsmeier@mchp.siemens.de>
273                  *
274                  * For future reference, the drive with the problem was:
275                  * QUANTUM QM318000TD-S N491
276                  */
277                 /* Reports QUEUE FULL for temporary resource shortages */
278                 { T_DIRECT, SIP_MEDIA_FIXED, quantum, "QM318000*", "*" },
279                 /*quirks*/0, /*mintags*/24, /*maxtags*/32
280         },
281         {
282                 /*
283                  * Broken tagged queuing drive
284                  * Reported by: Bret Ford <bford@uop.cs.uop.edu>
285                  *         and: Martin Renters <martin@tdc.on.ca>
286                  */
287                 { T_DIRECT, SIP_MEDIA_FIXED, seagate, "ST410800*", "71*" },
288                 /*quirks*/0, /*mintags*/0, /*maxtags*/0
289         },
290                 /*
291                  * The Seagate Medalist Pro drives have very poor write
292                  * performance with anything more than 2 tags.
293                  * 
294                  * Reported by:  Paul van der Zwan <paulz@trantor.xs4all.nl>
295                  * Drive:  <SEAGATE ST36530N 1444>
296                  *
297                  * Reported by:  Jeremy Lea <reg@shale.csir.co.za>
298                  * Drive:  <SEAGATE ST34520W 1281>
299                  *
300                  * No one has actually reported that the 9G version
301                  * (ST39140*) of the Medalist Pro has the same problem, but
302                  * we're assuming that it does because the 4G and 6.5G
303                  * versions of the drive are broken.
304                  */
305         {
306                 { T_DIRECT, SIP_MEDIA_FIXED, seagate, "ST34520*", "*"},
307                 /*quirks*/0, /*mintags*/2, /*maxtags*/2
308         },
309         {
310                 { T_DIRECT, SIP_MEDIA_FIXED, seagate, "ST36530*", "*"},
311                 /*quirks*/0, /*mintags*/2, /*maxtags*/2
312         },
313         {
314                 { T_DIRECT, SIP_MEDIA_FIXED, seagate, "ST39140*", "*"},
315                 /*quirks*/0, /*mintags*/2, /*maxtags*/2
316         },
317         {
318                 /*
319                  * Slow when tagged queueing is enabled.  Write performance
320                  * steadily drops off with more and more concurrent
321                  * transactions.  Best sequential write performance with
322                  * tagged queueing turned off and write caching turned on.
323                  *
324                  * PR:  kern/10398
325                  * Submitted by:  Hideaki Okada <hokada@isl.melco.co.jp>
326                  * Drive:  DCAS-34330 w/ "S65A" firmware.
327                  *
328                  * The drive with the problem had the "S65A" firmware
329                  * revision, and has also been reported (by Stephen J.
330                  * Roznowski <sjr@home.net>) for a drive with the "S61A"
331                  * firmware revision.
332                  *
333                  * Although no one has reported problems with the 2 gig
334                  * version of the DCAS drive, the assumption is that it
335                  * has the same problems as the 4 gig version.  Therefore
336                  * this quirk entries disables tagged queueing for all
337                  * DCAS drives.
338                  */
339                 { T_DIRECT, SIP_MEDIA_FIXED, "IBM", "DCAS*", "*" },
340                 /*quirks*/0, /*mintags*/0, /*maxtags*/0
341         },
342         {
343                 /* Broken tagged queuing drive */
344                 { T_DIRECT, SIP_MEDIA_REMOVABLE, "iomega", "jaz*", "*" },
345                 /*quirks*/0, /*mintags*/0, /*maxtags*/0
346         },
347         {
348                 /* Broken tagged queuing drive */ 
349                 { T_DIRECT, SIP_MEDIA_FIXED, "CONNER", "CFP2107*", "*" },
350                 /*quirks*/0, /*mintags*/0, /*maxtags*/0
351         },
352         {
353                 /*
354                  * Broken tagged queuing drive.
355                  * Submitted by:
356                  * NAKAJI Hiroyuki <nakaji@zeisei.dpri.kyoto-u.ac.jp>
357                  * in PR kern/9535
358                  */
359                 { T_DIRECT, SIP_MEDIA_FIXED, samsung, "WN34324U*", "*" },
360                 /*quirks*/0, /*mintags*/0, /*maxtags*/0
361         },
362         {
363                 /*
364                  * Slow when tagged queueing is enabled. (1.5MB/sec versus
365                  * 8MB/sec.)
366                  * Submitted by: Andrew Gallatin <gallatin@cs.duke.edu>
367                  * Best performance with these drives is achieved with
368                  * tagged queueing turned off, and write caching turned on.
369                  */
370                 { T_DIRECT, SIP_MEDIA_FIXED, west_digital, "WDE*", "*" },
371                 /*quirks*/0, /*mintags*/0, /*maxtags*/0
372         },
373         {
374                 /*
375                  * Slow when tagged queueing is enabled. (1.5MB/sec versus
376                  * 8MB/sec.)
377                  * Submitted by: Andrew Gallatin <gallatin@cs.duke.edu>
378                  * Best performance with these drives is achieved with
379                  * tagged queueing turned off, and write caching turned on.
380                  */
381                 { T_DIRECT, SIP_MEDIA_FIXED, west_digital, "ENTERPRISE", "*" },
382                 /*quirks*/0, /*mintags*/0, /*maxtags*/0
383         },
384         {
385                 /*
386                  * Doesn't handle queue full condition correctly,
387                  * so we need to limit maxtags to what the device
388                  * can handle instead of determining this automatically.
389                  */
390                 { T_DIRECT, SIP_MEDIA_FIXED, samsung, "WN321010S*", "*" },
391                 /*quirks*/0, /*mintags*/2, /*maxtags*/32
392         },
393         {
394                 /* Really only one LUN */
395                 { T_ENCLOSURE, SIP_MEDIA_FIXED, "SUN", "SENA", "*" },
396                 CAM_QUIRK_NOLUNS, /*mintags*/0, /*maxtags*/0
397         },
398         {
399                 /* I can't believe we need a quirk for DPT volumes. */
400                 { T_ANY, SIP_MEDIA_FIXED|SIP_MEDIA_REMOVABLE, "DPT", "*", "*" },
401                 CAM_QUIRK_NOSERIAL|CAM_QUIRK_NOLUNS,
402                 /*mintags*/0, /*maxtags*/255
403         },
404         {
405                 /*
406                  * Many Sony CDROM drives don't like multi-LUN probing.
407                  */
408                 { T_CDROM, SIP_MEDIA_REMOVABLE, sony, "CD-ROM CDU*", "*" },
409                 CAM_QUIRK_NOLUNS, /*mintags*/0, /*maxtags*/0
410         },
411         {
412                 /*
413                  * This drive doesn't like multiple LUN probing.
414                  * Submitted by:  Parag Patel <parag@cgt.com>
415                  */
416                 { T_WORM, SIP_MEDIA_REMOVABLE, sony, "CD-R   CDU9*", "*" },
417                 CAM_QUIRK_NOLUNS, /*mintags*/0, /*maxtags*/0
418         },
419         {
420                 { T_WORM, SIP_MEDIA_REMOVABLE, "YAMAHA", "CDR100*", "*" },
421                 CAM_QUIRK_NOLUNS, /*mintags*/0, /*maxtags*/0
422         },
423         {
424                 /*
425                  * The 8200 doesn't like multi-lun probing, and probably
426                  * don't like serial number requests either.
427                  */
428                 {
429                         T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "EXABYTE",
430                         "EXB-8200*", "*"
431                 },
432                 CAM_QUIRK_NOSERIAL|CAM_QUIRK_NOLUNS, /*mintags*/0, /*maxtags*/0
433         },
434         {
435                 /*
436                  * Let's try the same as above, but for a drive that says
437                  * it's an IPL-6860 but is actually an EXB 8200.
438                  */
439                 {
440                         T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "EXABYTE",
441                         "IPL-6860*", "*"
442                 },
443                 CAM_QUIRK_NOSERIAL|CAM_QUIRK_NOLUNS, /*mintags*/0, /*maxtags*/0
444         },
445         {
446                 /*
447                  * These Hitachi drives don't like multi-lun probing.
448                  * The PR submitter has a DK319H, but says that the Linux
449                  * kernel has a similar work-around for the DK312 and DK314,
450                  * so all DK31* drives are quirked here.
451                  * PR:            misc/18793
452                  * Submitted by:  Paul Haddad <paul@pth.com>
453                  */
454                 { T_DIRECT, SIP_MEDIA_FIXED, "HITACHI", "DK31*", "*" },
455                 CAM_QUIRK_NOLUNS, /*mintags*/2, /*maxtags*/255
456         },
457         {
458                 /*
459                  * This old revision of the TDC3600 is also SCSI-1, and
460                  * hangs upon serial number probing.
461                  */
462                 {
463                         T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "TANDBERG",
464                         " TDC 3600", "U07:"
465                 },
466                 CAM_QUIRK_NOSERIAL, /*mintags*/0, /*maxtags*/0
467         },
468         {
469                 /*
470                  * Would repond to all LUNs if asked for.
471                  */
472                 {
473                         T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "CALIPER",
474                         "CP150", "*"
475                 },
476                 CAM_QUIRK_NOLUNS, /*mintags*/0, /*maxtags*/0
477         },
478         {
479                 /*
480                  * Would repond to all LUNs if asked for.
481                  */
482                 {
483                         T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "KENNEDY",
484                         "96X2*", "*"
485                 },
486                 CAM_QUIRK_NOLUNS, /*mintags*/0, /*maxtags*/0
487         },
488         {
489                 /* Submitted by: Matthew Dodd <winter@jurai.net> */
490                 { T_PROCESSOR, SIP_MEDIA_FIXED, "Cabletrn", "EA41*", "*" },
491                 CAM_QUIRK_NOLUNS, /*mintags*/0, /*maxtags*/0
492         },
493         {
494                 /* Submitted by: Matthew Dodd <winter@jurai.net> */
495                 { T_PROCESSOR, SIP_MEDIA_FIXED, "CABLETRN", "EA41*", "*" },
496                 CAM_QUIRK_NOLUNS, /*mintags*/0, /*maxtags*/0
497         },
498         {
499                 /* TeraSolutions special settings for TRC-22 RAID */
500                 { T_DIRECT, SIP_MEDIA_FIXED, "TERASOLU", "TRC-22", "*" },
501                   /*quirks*/0, /*mintags*/55, /*maxtags*/255
502         },
503         {
504                 /* Veritas Storage Appliance */
505                 { T_DIRECT, SIP_MEDIA_FIXED, "VERITAS", "*", "*" },
506                   CAM_QUIRK_HILUNS, /*mintags*/2, /*maxtags*/1024
507         },
508         {
509                 /*
510                  * Would respond to all LUNs.  Device type and removable
511                  * flag are jumper-selectable.
512                  */
513                 { T_ANY, SIP_MEDIA_REMOVABLE|SIP_MEDIA_FIXED, "MaxOptix",
514                   "Tahiti 1", "*"
515                 },
516                 CAM_QUIRK_NOLUNS, /*mintags*/0, /*maxtags*/0
517         },
518         {
519                 /* Default tagged queuing parameters for all devices */
520                 {
521                   T_ANY, SIP_MEDIA_REMOVABLE|SIP_MEDIA_FIXED,
522                   /*vendor*/"*", /*product*/"*", /*revision*/"*"
523                 },
524                 /*quirks*/0, /*mintags*/2, /*maxtags*/255
525         },
526 };
527
528 static const int xpt_quirk_table_size =
529         sizeof(xpt_quirk_table) / sizeof(*xpt_quirk_table);
530
531 typedef enum {
532         DM_RET_COPY             = 0x01,
533         DM_RET_FLAG_MASK        = 0x0f,
534         DM_RET_NONE             = 0x00,
535         DM_RET_STOP             = 0x10,
536         DM_RET_DESCEND          = 0x20,
537         DM_RET_ERROR            = 0x30,
538         DM_RET_ACTION_MASK      = 0xf0
539 } dev_match_ret;
540
541 typedef enum {
542         XPT_DEPTH_BUS,
543         XPT_DEPTH_TARGET,
544         XPT_DEPTH_DEVICE,
545         XPT_DEPTH_PERIPH
546 } xpt_traverse_depth;
547
548 struct xpt_traverse_config {
549         xpt_traverse_depth      depth;
550         void                    *tr_func;
551         void                    *tr_arg;
552 };
553
554 typedef int     xpt_busfunc_t (struct cam_eb *bus, void *arg);
555 typedef int     xpt_targetfunc_t (struct cam_et *target, void *arg);
556 typedef int     xpt_devicefunc_t (struct cam_ed *device, void *arg);
557 typedef int     xpt_periphfunc_t (struct cam_periph *periph, void *arg);
558 typedef int     xpt_pdrvfunc_t (struct periph_driver **pdrv, void *arg);
559
560 /* Transport layer configuration information */
561 static struct xpt_softc xsoftc;
562
563 /* Queues for our software interrupt handler */
564 typedef TAILQ_HEAD(cam_isrq, ccb_hdr) cam_isrq_t;
565 static cam_isrq_t cam_bioq;
566 static cam_isrq_t cam_netq;
567
568 /* "Pool" of inactive ccbs managed by xpt_alloc_ccb and xpt_free_ccb */
569 static SLIST_HEAD(,ccb_hdr) ccb_freeq;
570 static u_int xpt_max_ccbs;      /*
571                                  * Maximum size of ccb pool.  Modified as
572                                  * devices are added/removed or have their
573                                  * opening counts changed.
574                                  */
575 static u_int xpt_ccb_count;     /* Current count of allocated ccbs */
576
577 struct cam_periph *xpt_periph;
578
579 static periph_init_t xpt_periph_init;
580
581 static periph_init_t probe_periph_init;
582
583 static struct periph_driver xpt_driver =
584 {
585         xpt_periph_init, "xpt",
586         TAILQ_HEAD_INITIALIZER(xpt_driver.units)
587 };
588
589 static struct periph_driver probe_driver =
590 {
591         probe_periph_init, "probe",
592         TAILQ_HEAD_INITIALIZER(probe_driver.units)
593 };
594
595 DATA_SET(periphdriver_set, xpt_driver);
596 DATA_SET(periphdriver_set, probe_driver);
597
598 #define XPT_CDEV_MAJOR 104
599
600 static d_open_t xptopen;
601 static d_close_t xptclose;
602 static d_ioctl_t xptioctl;
603
604 static struct cdevsw xpt_cdevsw = {
605         /* name */      "xpt",
606         /* maj */       XPT_CDEV_MAJOR,
607         /* flags */     0,
608         /* port */      NULL,
609         /* clone */     NULL,
610
611         /* open */      xptopen,
612         /* close */     xptclose,
613         /* read */      noread,
614         /* write */     nowrite,
615         /* ioctl */     xptioctl,
616         /* poll */      nopoll,
617         /* mmap */      nommap,
618         /* strategy */  nostrategy,
619         /* dump */      nodump,
620         /* psize */     nopsize
621 };
622
623 static struct intr_config_hook *xpt_config_hook;
624
625 /* Registered busses */
626 static TAILQ_HEAD(,cam_eb) xpt_busses;
627 static u_int bus_generation;
628
629 /* Storage for debugging datastructures */
630 #ifdef  CAMDEBUG
631 struct cam_path *cam_dpath;
632 u_int32_t cam_dflags;
633 u_int32_t cam_debug_delay;
634 #endif
635
636 #if defined(CAM_DEBUG_FLAGS) && !defined(CAMDEBUG)
637 #error "You must have options CAMDEBUG to use options CAM_DEBUG_FLAGS"
638 #endif
639
640 /*
641  * In order to enable the CAM_DEBUG_* options, the user must have CAMDEBUG
642  * enabled.  Also, the user must have either none, or all of CAM_DEBUG_BUS,
643  * CAM_DEBUG_TARGET, and CAM_DEBUG_LUN specified.
644  */
645 #if defined(CAM_DEBUG_BUS) || defined(CAM_DEBUG_TARGET) \
646     || defined(CAM_DEBUG_LUN)
647 #ifdef CAMDEBUG
648 #if !defined(CAM_DEBUG_BUS) || !defined(CAM_DEBUG_TARGET) \
649     || !defined(CAM_DEBUG_LUN)
650 #error "You must define all or none of CAM_DEBUG_BUS, CAM_DEBUG_TARGET \
651         and CAM_DEBUG_LUN"
652 #endif /* !CAM_DEBUG_BUS || !CAM_DEBUG_TARGET || !CAM_DEBUG_LUN */
653 #else /* !CAMDEBUG */
654 #error "You must use options CAMDEBUG if you use the CAM_DEBUG_* options"
655 #endif /* CAMDEBUG */
656 #endif /* CAM_DEBUG_BUS || CAM_DEBUG_TARGET || CAM_DEBUG_LUN */
657
658 /* Our boot-time initialization hook */
659 static void     xpt_init(void *);
660 SYSINIT(cam, SI_SUB_CONFIGURE, SI_ORDER_SECOND, xpt_init, NULL);
661
662 static cam_status       xpt_compile_path(struct cam_path *new_path,
663                                          struct cam_periph *perph,
664                                          path_id_t path_id,
665                                          target_id_t target_id,
666                                          lun_id_t lun_id);
667
668 static void             xpt_release_path(struct cam_path *path);
669
670 static void             xpt_async_bcast(struct async_list *async_head,
671                                         u_int32_t async_code,
672                                         struct cam_path *path,
673                                         void *async_arg);
674 static void             xpt_dev_async(u_int32_t async_code,
675                                       struct cam_eb *bus,
676                                       struct cam_et *target,
677                                       struct cam_ed *device,
678                                       void *async_arg);
679 static path_id_t xptnextfreepathid(void);
680 static path_id_t xptpathid(const char *sim_name, int sim_unit, int sim_bus);
681 static union ccb *xpt_get_ccb(struct cam_ed *device);
682 static int       xpt_schedule_dev(struct camq *queue, cam_pinfo *dev_pinfo,
683                                   u_int32_t new_priority);
684 static void      xpt_run_dev_allocq(struct cam_eb *bus);
685 static void      xpt_run_dev_sendq(struct cam_eb *bus);
686 static timeout_t xpt_release_devq_timeout;
687 static void      xpt_release_bus(struct cam_eb *bus);
688 static void      xpt_release_devq_device(struct cam_ed *dev, u_int count,
689                                          int run_queue);
690 static struct cam_et*
691                  xpt_alloc_target(struct cam_eb *bus, target_id_t target_id);
692 static void      xpt_release_target(struct cam_eb *bus, struct cam_et *target);
693 static struct cam_ed*
694                  xpt_alloc_device(struct cam_eb *bus, struct cam_et *target,
695                                   lun_id_t lun_id);
696 static void      xpt_release_device(struct cam_eb *bus, struct cam_et *target,
697                                     struct cam_ed *device);
698 static u_int32_t xpt_dev_ccbq_resize(struct cam_path *path, int newopenings);
699 static struct cam_eb*
700                  xpt_find_bus(path_id_t path_id);
701 static struct cam_et*
702                  xpt_find_target(struct cam_eb *bus, target_id_t target_id);
703 static struct cam_ed*
704                  xpt_find_device(struct cam_et *target, lun_id_t lun_id);
705 static void      xpt_scan_bus(struct cam_periph *periph, union ccb *ccb);
706 static void      xpt_scan_lun(struct cam_periph *periph,
707                               struct cam_path *path, cam_flags flags,
708                               union ccb *ccb);
709 static void      xptscandone(struct cam_periph *periph, union ccb *done_ccb);
710 static xpt_busfunc_t    xptconfigbuscountfunc;
711 static xpt_busfunc_t    xptconfigfunc;
712 static void      xpt_config(void *arg);
713 static xpt_devicefunc_t xptpassannouncefunc;
714 static void      xpt_finishconfig(struct cam_periph *periph, union ccb *ccb);
715 static void      xptaction(struct cam_sim *sim, union ccb *work_ccb);
716 static void      xptpoll(struct cam_sim *sim);
717 static inthand2_t swi_camnet;
718 static inthand2_t swi_cambio;
719 static void      camisr(cam_isrq_t *queue);
720 #if 0
721 static void      xptstart(struct cam_periph *periph, union ccb *work_ccb);
722 static void      xptasync(struct cam_periph *periph,
723                           u_int32_t code, cam_path *path);
724 #endif
725 static dev_match_ret    xptbusmatch(struct dev_match_pattern *patterns,
726                                     int num_patterns, struct cam_eb *bus);
727 static dev_match_ret    xptdevicematch(struct dev_match_pattern *patterns,
728                                        int num_patterns, struct cam_ed *device);
729 static dev_match_ret    xptperiphmatch(struct dev_match_pattern *patterns,
730                                        int num_patterns,
731                                        struct cam_periph *periph);
732 static xpt_busfunc_t    xptedtbusfunc;
733 static xpt_targetfunc_t xptedttargetfunc;
734 static xpt_devicefunc_t xptedtdevicefunc;
735 static xpt_periphfunc_t xptedtperiphfunc;
736 static xpt_pdrvfunc_t   xptplistpdrvfunc;
737 static xpt_periphfunc_t xptplistperiphfunc;
738 static int              xptedtmatch(struct ccb_dev_match *cdm);
739 static int              xptperiphlistmatch(struct ccb_dev_match *cdm);
740 static int              xptbustraverse(struct cam_eb *start_bus,
741                                        xpt_busfunc_t *tr_func, void *arg);
742 static int              xpttargettraverse(struct cam_eb *bus,
743                                           struct cam_et *start_target,
744                                           xpt_targetfunc_t *tr_func, void *arg);
745 static int              xptdevicetraverse(struct cam_et *target,
746                                           struct cam_ed *start_device,
747                                           xpt_devicefunc_t *tr_func, void *arg);
748 static int              xptperiphtraverse(struct cam_ed *device,
749                                           struct cam_periph *start_periph,
750                                           xpt_periphfunc_t *tr_func, void *arg);
751 static int              xptpdrvtraverse(struct periph_driver **start_pdrv,
752                                         xpt_pdrvfunc_t *tr_func, void *arg);
753 static int              xptpdperiphtraverse(struct periph_driver **pdrv,
754                                             struct cam_periph *start_periph,
755                                             xpt_periphfunc_t *tr_func,
756                                             void *arg);
757 static xpt_busfunc_t    xptdefbusfunc;
758 static xpt_targetfunc_t xptdeftargetfunc;
759 static xpt_devicefunc_t xptdefdevicefunc;
760 static xpt_periphfunc_t xptdefperiphfunc;
761 static int              xpt_for_all_busses(xpt_busfunc_t *tr_func, void *arg);
762 #ifdef notusedyet
763 static int              xpt_for_all_targets(xpt_targetfunc_t *tr_func,
764                                             void *arg);
765 #endif
766 static int              xpt_for_all_devices(xpt_devicefunc_t *tr_func,
767                                             void *arg);
768 #ifdef notusedyet
769 static int              xpt_for_all_periphs(xpt_periphfunc_t *tr_func,
770                                             void *arg);
771 #endif
772 static xpt_devicefunc_t xptsetasyncfunc;
773 static xpt_busfunc_t    xptsetasyncbusfunc;
774 static cam_status       xptregister(struct cam_periph *periph,
775                                     void *arg);
776 static cam_status       proberegister(struct cam_periph *periph,
777                                       void *arg);
778 static void      probeschedule(struct cam_periph *probe_periph);
779 static void      probestart(struct cam_periph *periph, union ccb *start_ccb);
780 static void      proberequestdefaultnegotiation(struct cam_periph *periph);
781 static void      probedone(struct cam_periph *periph, union ccb *done_ccb);
782 static void      probecleanup(struct cam_periph *periph);
783 static void      xpt_find_quirk(struct cam_ed *device);
784 static void      xpt_set_transfer_settings(struct ccb_trans_settings *cts,
785                                            struct cam_ed *device,
786                                            int async_update);
787 static void      xpt_toggle_tags(struct cam_path *path);
788 static void      xpt_start_tags(struct cam_path *path);
789 static __inline int xpt_schedule_dev_allocq(struct cam_eb *bus,
790                                             struct cam_ed *dev);
791 static __inline int xpt_schedule_dev_sendq(struct cam_eb *bus,
792                                            struct cam_ed *dev);
793 static __inline int periph_is_queued(struct cam_periph *periph);
794 static __inline int device_is_alloc_queued(struct cam_ed *device);
795 static __inline int device_is_send_queued(struct cam_ed *device);
796 static __inline int dev_allocq_is_runnable(struct cam_devq *devq);
797
798 static __inline int
799 xpt_schedule_dev_allocq(struct cam_eb *bus, struct cam_ed *dev)
800 {
801         int retval;
802
803         if (bus->sim->devq && dev->ccbq.devq_openings > 0) {
804                 if ((dev->flags & CAM_DEV_RESIZE_QUEUE_NEEDED) != 0) {
805                         cam_ccbq_resize(&dev->ccbq,
806                                         dev->ccbq.dev_openings
807                                         + dev->ccbq.dev_active);
808                         dev->flags &= ~CAM_DEV_RESIZE_QUEUE_NEEDED;
809                 }
810                 /*
811                  * The priority of a device waiting for CCB resources
812                  * is that of the the highest priority peripheral driver
813                  * enqueued.
814                  */
815                 retval = xpt_schedule_dev(&bus->sim->devq->alloc_queue,
816                                           &dev->alloc_ccb_entry.pinfo,
817                                           CAMQ_GET_HEAD(&dev->drvq)->priority); 
818         } else {
819                 retval = 0;
820         }
821
822         return (retval);
823 }
824
825 static __inline int
826 xpt_schedule_dev_sendq(struct cam_eb *bus, struct cam_ed *dev)
827 {
828         int     retval;
829
830         if (bus->sim->devq && dev->ccbq.dev_openings > 0) {
831                 /*
832                  * The priority of a device waiting for controller
833                  * resources is that of the the highest priority CCB
834                  * enqueued.
835                  */
836                 retval =
837                     xpt_schedule_dev(&bus->sim->devq->send_queue,
838                                      &dev->send_ccb_entry.pinfo,
839                                      CAMQ_GET_HEAD(&dev->ccbq.queue)->priority);
840         } else {
841                 retval = 0;
842         }
843         return (retval);
844 }
845
846 static __inline int
847 periph_is_queued(struct cam_periph *periph)
848 {
849         return (periph->pinfo.index != CAM_UNQUEUED_INDEX);
850 }
851
852 static __inline int
853 device_is_alloc_queued(struct cam_ed *device)
854 {
855         return (device->alloc_ccb_entry.pinfo.index != CAM_UNQUEUED_INDEX);
856 }
857
858 static __inline int
859 device_is_send_queued(struct cam_ed *device)
860 {
861         return (device->send_ccb_entry.pinfo.index != CAM_UNQUEUED_INDEX);
862 }
863
864 static __inline int
865 dev_allocq_is_runnable(struct cam_devq *devq)
866 {
867         /*
868          * Have work to do.
869          * Have space to do more work.
870          * Allowed to do work.
871          */
872         return ((devq->alloc_queue.qfrozen_cnt == 0)
873              && (devq->alloc_queue.entries > 0)
874              && (devq->alloc_openings > 0));
875 }
876
877 static void
878 xpt_periph_init(void)
879 {
880         cdevsw_add(&xpt_cdevsw, 0, 0);
881         make_dev(&xpt_cdevsw, 0, UID_ROOT, GID_OPERATOR, 0600, "xpt0");
882 }
883
884 static void
885 probe_periph_init(void)
886 {
887 }
888
889
890 static void
891 xptdone(struct cam_periph *periph, union ccb *done_ccb)
892 {
893         /* Caller will release the CCB */
894         wakeup(&done_ccb->ccb_h.cbfcnp);
895 }
896
897 static int
898 xptopen(dev_t dev, int flags, int fmt, struct thread *td)
899 {
900         int unit;
901
902         unit = minor(dev) & 0xff;
903
904         /*
905          * Only allow read-write access.
906          */
907         if (((flags & FWRITE) == 0) || ((flags & FREAD) == 0))
908                 return(EPERM);
909
910         /*
911          * We don't allow nonblocking access.
912          */
913         if ((flags & O_NONBLOCK) != 0) {
914                 printf("xpt%d: can't do nonblocking access\n", unit);
915                 return(ENODEV);
916         }
917
918         /*
919          * We only have one transport layer right now.  If someone accesses
920          * us via something other than minor number 1, point out their
921          * mistake.
922          */
923         if (unit != 0) {
924                 printf("xptopen: got invalid xpt unit %d\n", unit);
925                 return(ENXIO);
926         }
927
928         /* Mark ourselves open */
929         xsoftc.flags |= XPT_FLAG_OPEN;
930         
931         return(0);
932 }
933
934 static int
935 xptclose(dev_t dev, int flag, int fmt, struct thread *td)
936 {
937         int unit;
938
939         unit = minor(dev) & 0xff;
940
941         /*
942          * We only have one transport layer right now.  If someone accesses
943          * us via something other than minor number 1, point out their
944          * mistake.
945          */
946         if (unit != 0) {
947                 printf("xptclose: got invalid xpt unit %d\n", unit);
948                 return(ENXIO);
949         }
950
951         /* Mark ourselves closed */
952         xsoftc.flags &= ~XPT_FLAG_OPEN;
953
954         return(0);
955 }
956
957 static int
958 xptioctl(dev_t dev, u_long cmd, caddr_t addr, int flag, struct thread *td)
959 {
960         int unit, error;
961
962         error = 0;
963         unit = minor(dev) & 0xff;
964
965         /*
966          * We only have one transport layer right now.  If someone accesses
967          * us via something other than minor number 1, point out their
968          * mistake.
969          */
970         if (unit != 0) {
971                 printf("xptioctl: got invalid xpt unit %d\n", unit);
972                 return(ENXIO);
973         }
974
975         switch(cmd) {
976         /*
977          * For the transport layer CAMIOCOMMAND ioctl, we really only want
978          * to accept CCB types that don't quite make sense to send through a
979          * passthrough driver.
980          */
981         case CAMIOCOMMAND: {
982                 union ccb *ccb;
983                 union ccb *inccb;
984
985                 inccb = (union ccb *)addr;
986
987                 switch(inccb->ccb_h.func_code) {
988                 case XPT_SCAN_BUS:
989                 case XPT_RESET_BUS:
990                         if ((inccb->ccb_h.target_id != CAM_TARGET_WILDCARD)
991                          || (inccb->ccb_h.target_lun != CAM_LUN_WILDCARD)) {
992                                 error = EINVAL;
993                                 break;
994                         }
995                         /* FALLTHROUGH */
996                 case XPT_PATH_INQ:
997                 case XPT_ENG_INQ:
998                 case XPT_SCAN_LUN:
999
1000                         ccb = xpt_alloc_ccb();
1001
1002                         /*
1003                          * Create a path using the bus, target, and lun the
1004                          * user passed in.
1005                          */
1006                         if (xpt_create_path(&ccb->ccb_h.path, xpt_periph,
1007                                             inccb->ccb_h.path_id,
1008                                             inccb->ccb_h.target_id,
1009                                             inccb->ccb_h.target_lun) !=
1010                                             CAM_REQ_CMP){
1011                                 error = EINVAL;
1012                                 xpt_free_ccb(ccb);
1013                                 break;
1014                         }
1015                         /* Ensure all of our fields are correct */
1016                         xpt_setup_ccb(&ccb->ccb_h, ccb->ccb_h.path,
1017                                       inccb->ccb_h.pinfo.priority);
1018                         xpt_merge_ccb(ccb, inccb);
1019                         ccb->ccb_h.cbfcnp = xptdone;
1020                         cam_periph_runccb(ccb, NULL, 0, 0, NULL);
1021                         bcopy(ccb, inccb, sizeof(union ccb));
1022                         xpt_free_path(ccb->ccb_h.path);
1023                         xpt_free_ccb(ccb);
1024                         break;
1025
1026                 case XPT_DEBUG: {
1027                         union ccb ccb;
1028
1029                         /*
1030                          * This is an immediate CCB, so it's okay to
1031                          * allocate it on the stack.
1032                          */
1033
1034                         /*
1035                          * Create a path using the bus, target, and lun the
1036                          * user passed in.
1037                          */
1038                         if (xpt_create_path(&ccb.ccb_h.path, xpt_periph,
1039                                             inccb->ccb_h.path_id,
1040                                             inccb->ccb_h.target_id,
1041                                             inccb->ccb_h.target_lun) !=
1042                                             CAM_REQ_CMP){
1043                                 error = EINVAL;
1044                                 break;
1045                         }
1046                         /* Ensure all of our fields are correct */
1047                         xpt_setup_ccb(&ccb.ccb_h, ccb.ccb_h.path,
1048                                       inccb->ccb_h.pinfo.priority);
1049                         xpt_merge_ccb(&ccb, inccb);
1050                         ccb.ccb_h.cbfcnp = xptdone;
1051                         xpt_action(&ccb);
1052                         bcopy(&ccb, inccb, sizeof(union ccb));
1053                         xpt_free_path(ccb.ccb_h.path);
1054                         break;
1055
1056                 }
1057                 case XPT_DEV_MATCH: {
1058                         struct cam_periph_map_info mapinfo;
1059                         struct cam_path *old_path;
1060
1061                         /*
1062                          * We can't deal with physical addresses for this
1063                          * type of transaction.
1064                          */
1065                         if (inccb->ccb_h.flags & CAM_DATA_PHYS) {
1066                                 error = EINVAL;
1067                                 break;
1068                         }
1069
1070                         /*
1071                          * Save this in case the caller had it set to
1072                          * something in particular.
1073                          */
1074                         old_path = inccb->ccb_h.path;
1075
1076                         /*
1077                          * We really don't need a path for the matching
1078                          * code.  The path is needed because of the
1079                          * debugging statements in xpt_action().  They
1080                          * assume that the CCB has a valid path.
1081                          */
1082                         inccb->ccb_h.path = xpt_periph->path;
1083
1084                         bzero(&mapinfo, sizeof(mapinfo));
1085
1086                         /*
1087                          * Map the pattern and match buffers into kernel
1088                          * virtual address space.
1089                          */
1090                         error = cam_periph_mapmem(inccb, &mapinfo);
1091
1092                         if (error) {
1093                                 inccb->ccb_h.path = old_path;
1094                                 break;
1095                         }
1096
1097                         /*
1098                          * This is an immediate CCB, we can send it on directly.
1099                          */
1100                         xpt_action(inccb);
1101
1102                         /*
1103                          * Map the buffers back into user space.
1104                          */
1105                         cam_periph_unmapmem(inccb, &mapinfo);
1106
1107                         inccb->ccb_h.path = old_path;
1108
1109                         error = 0;
1110                         break;
1111                 }
1112                 default:
1113                         error = ENOTSUP;
1114                         break;
1115                 }
1116                 break;
1117         }
1118         /*
1119          * This is the getpassthru ioctl. It takes a XPT_GDEVLIST ccb as input,
1120          * with the periphal driver name and unit name filled in.  The other
1121          * fields don't really matter as input.  The passthrough driver name
1122          * ("pass"), and unit number are passed back in the ccb.  The current
1123          * device generation number, and the index into the device peripheral
1124          * driver list, and the status are also passed back.  Note that
1125          * since we do everything in one pass, unlike the XPT_GDEVLIST ccb,
1126          * we never return a status of CAM_GDEVLIST_LIST_CHANGED.  It is
1127          * (or rather should be) impossible for the device peripheral driver
1128          * list to change since we look at the whole thing in one pass, and
1129          * we do it within a critical section.
1130          * 
1131          */
1132         case CAMGETPASSTHRU: {
1133                 union ccb *ccb;
1134                 struct cam_periph *periph;
1135                 struct periph_driver **p_drv;
1136                 char   *name;
1137                 int unit;
1138                 int cur_generation;
1139                 int base_periph_found;
1140                 int splbreaknum;
1141
1142                 ccb = (union ccb *)addr;
1143                 unit = ccb->cgdl.unit_number;
1144                 name = ccb->cgdl.periph_name;
1145                 /*
1146                  * Every 100 devices, we want to call splz() to check for
1147                  * and allow the software interrupt handler a chance to run.
1148                  *
1149                  * Most systems won't run into this check, but this should
1150                  * avoid starvation in the software interrupt handler in
1151                  * large systems.
1152                  */
1153                 splbreaknum = 100;
1154
1155                 ccb = (union ccb *)addr;
1156
1157                 base_periph_found = 0;
1158
1159                 /*
1160                  * Sanity check -- make sure we don't get a null peripheral
1161                  * driver name.
1162                  */
1163                 if (*ccb->cgdl.periph_name == '\0') {
1164                         error = EINVAL;
1165                         break;
1166                 }
1167
1168                 /* Keep the list from changing while we traverse it */
1169                 crit_enter();
1170 ptstartover:
1171                 cur_generation = xsoftc.generation;
1172
1173                 /* first find our driver in the list of drivers */
1174                 SET_FOREACH(p_drv, periphdriver_set) {
1175                         if (strcmp((*p_drv)->driver_name, name) == 0)
1176                                 break;
1177                 }
1178
1179                 if (*p_drv == NULL) {
1180                         crit_exit();
1181                         ccb->ccb_h.status = CAM_REQ_CMP_ERR;
1182                         ccb->cgdl.status = CAM_GDEVLIST_ERROR;
1183                         *ccb->cgdl.periph_name = '\0';
1184                         ccb->cgdl.unit_number = 0;
1185                         error = ENOENT;
1186                         break;
1187                 }       
1188
1189                 /*
1190                  * Run through every peripheral instance of this driver
1191                  * and check to see whether it matches the unit passed
1192                  * in by the user.  If it does, get out of the loops and
1193                  * find the passthrough driver associated with that
1194                  * peripheral driver.
1195                  */
1196                 for (periph = TAILQ_FIRST(&(*p_drv)->units); periph != NULL;
1197                      periph = TAILQ_NEXT(periph, unit_links)) {
1198
1199                         if (periph->unit_number == unit) {
1200                                 break;
1201                         } else if (--splbreaknum == 0) {
1202                                 splz();
1203                                 splbreaknum = 100;
1204                                 if (cur_generation != xsoftc.generation)
1205                                        goto ptstartover;
1206                         }
1207                 }
1208                 /*
1209                  * If we found the peripheral driver that the user passed
1210                  * in, go through all of the peripheral drivers for that
1211                  * particular device and look for a passthrough driver.
1212                  */
1213                 if (periph != NULL) {
1214                         struct cam_ed *device;
1215                         int i;
1216
1217                         base_periph_found = 1;
1218                         device = periph->path->device;
1219                         for (i = 0, periph = device->periphs.slh_first;
1220                              periph != NULL;
1221                              periph = periph->periph_links.sle_next, i++) {
1222                                 /*
1223                                  * Check to see whether we have a
1224                                  * passthrough device or not. 
1225                                  */
1226                                 if (strcmp(periph->periph_name, "pass") == 0) {
1227                                         /*
1228                                          * Fill in the getdevlist fields.
1229                                          */
1230                                         strcpy(ccb->cgdl.periph_name,
1231                                                periph->periph_name);
1232                                         ccb->cgdl.unit_number =
1233                                                 periph->unit_number;
1234                                         if (periph->periph_links.sle_next)
1235                                                 ccb->cgdl.status =
1236                                                         CAM_GDEVLIST_MORE_DEVS;
1237                                         else
1238                                                 ccb->cgdl.status =
1239                                                        CAM_GDEVLIST_LAST_DEVICE;
1240                                         ccb->cgdl.generation =
1241                                                 device->generation;
1242                                         ccb->cgdl.index = i;
1243                                         /*
1244                                          * Fill in some CCB header fields
1245                                          * that the user may want.
1246                                          */
1247                                         ccb->ccb_h.path_id =
1248                                                 periph->path->bus->path_id;
1249                                         ccb->ccb_h.target_id =
1250                                                 periph->path->target->target_id;
1251                                         ccb->ccb_h.target_lun =
1252                                                 periph->path->device->lun_id;
1253                                         ccb->ccb_h.status = CAM_REQ_CMP;
1254                                         break;
1255                                 }
1256                         }
1257                 }
1258
1259                 /*
1260                  * If the periph is null here, one of two things has
1261                  * happened.  The first possibility is that we couldn't
1262                  * find the unit number of the particular peripheral driver
1263                  * that the user is asking about.  e.g. the user asks for
1264                  * the passthrough driver for "da11".  We find the list of
1265                  * "da" peripherals all right, but there is no unit 11.
1266                  * The other possibility is that we went through the list
1267                  * of peripheral drivers attached to the device structure,
1268                  * but didn't find one with the name "pass".  Either way,
1269                  * we return ENOENT, since we couldn't find something.
1270                  */
1271                 if (periph == NULL) {
1272                         ccb->ccb_h.status = CAM_REQ_CMP_ERR;
1273                         ccb->cgdl.status = CAM_GDEVLIST_ERROR;
1274                         *ccb->cgdl.periph_name = '\0';
1275                         ccb->cgdl.unit_number = 0;
1276                         error = ENOENT;
1277                         /*
1278                          * It is unfortunate that this is even necessary,
1279                          * but there are many, many clueless users out there.
1280                          * If this is true, the user is looking for the
1281                          * passthrough driver, but doesn't have one in his
1282                          * kernel.
1283                          */
1284                         if (base_periph_found == 1) {
1285                                 printf("xptioctl: pass driver is not in the "
1286                                        "kernel\n");
1287                                 printf("xptioctl: put \"device pass0\" in "
1288                                        "your kernel config file\n");
1289                         }
1290                 }
1291                 crit_exit();
1292                 break;
1293                 }
1294         default:
1295                 error = ENOTTY;
1296                 break;
1297         }
1298
1299         return(error);
1300 }
1301
1302 /* Functions accessed by the peripheral drivers */
1303 static void
1304 xpt_init(void *dummy)
1305 {
1306         struct cam_sim *xpt_sim;
1307         struct cam_path *path;
1308         struct cam_devq *devq;
1309         cam_status status;
1310
1311         TAILQ_INIT(&xpt_busses);
1312         TAILQ_INIT(&cam_bioq);
1313         TAILQ_INIT(&cam_netq);
1314         SLIST_INIT(&ccb_freeq);
1315         STAILQ_INIT(&highpowerq);
1316
1317         /*
1318          * The xpt layer is, itself, the equivelent of a SIM.
1319          * Allow 16 ccbs in the ccb pool for it.  This should
1320          * give decent parallelism when we probe busses and
1321          * perform other XPT functions.
1322          */
1323         devq = cam_simq_alloc(16);
1324         xpt_sim = cam_sim_alloc(xptaction,
1325                                 xptpoll,
1326                                 "xpt",
1327                                 /*softc*/NULL,
1328                                 /*unit*/0,
1329                                 /*max_dev_transactions*/0,
1330                                 /*max_tagged_dev_transactions*/0,
1331                                 devq);
1332         cam_simq_release(devq);
1333         xpt_max_ccbs = 16;
1334                                 
1335         xpt_bus_register(xpt_sim, /*bus #*/0);
1336
1337         /*
1338          * Looking at the XPT from the SIM layer, the XPT is
1339          * the equivelent of a peripheral driver.  Allocate
1340          * a peripheral driver entry for us.
1341          */
1342         if ((status = xpt_create_path(&path, NULL, CAM_XPT_PATH_ID,
1343                                       CAM_TARGET_WILDCARD,
1344                                       CAM_LUN_WILDCARD)) != CAM_REQ_CMP) {
1345                 printf("xpt_init: xpt_create_path failed with status %#x,"
1346                        " failing attach\n", status);
1347                 return;
1348         }
1349
1350         cam_periph_alloc(xptregister, NULL, NULL, NULL, "xpt", CAM_PERIPH_BIO,
1351                          path, NULL, 0, NULL);
1352         xpt_free_path(path);
1353
1354         xpt_sim->softc = xpt_periph;
1355
1356         /*
1357          * Register a callback for when interrupts are enabled.
1358          */
1359         xpt_config_hook = malloc(sizeof(struct intr_config_hook),
1360                                   M_TEMP, M_INTWAIT | M_ZERO);
1361         xpt_config_hook->ich_func = xpt_config;
1362         xpt_config_hook->ich_desc = "xpt";
1363         if (config_intrhook_establish(xpt_config_hook) != 0) {
1364                 free (xpt_config_hook, M_TEMP);
1365                 printf("xpt_init: config_intrhook_establish failed "
1366                        "- failing attach\n");
1367         }
1368
1369         /* Install our software interrupt handlers */
1370         register_swi(SWI_CAMNET, swi_camnet, NULL, "swi_camnet", NULL);
1371         register_swi(SWI_CAMBIO, swi_cambio, NULL, "swi_cambio", NULL);
1372 }
1373
1374 static cam_status
1375 xptregister(struct cam_periph *periph, void *arg)
1376 {
1377         if (periph == NULL) {
1378                 printf("xptregister: periph was NULL!!\n");
1379                 return(CAM_REQ_CMP_ERR);
1380         }
1381
1382         periph->softc = NULL;
1383
1384         xpt_periph = periph;
1385
1386         return(CAM_REQ_CMP);
1387 }
1388
1389 int32_t
1390 xpt_add_periph(struct cam_periph *periph)
1391 {
1392         struct cam_ed *device;
1393         int32_t  status;
1394         struct periph_list *periph_head;
1395
1396         device = periph->path->device;
1397
1398         periph_head = &device->periphs;
1399
1400         status = CAM_REQ_CMP;
1401
1402         if (device != NULL) {
1403                 /*
1404                  * Make room for this peripheral
1405                  * so it will fit in the queue
1406                  * when it's scheduled to run
1407                  */
1408                 crit_enter();
1409                 status = camq_resize(&device->drvq,
1410                                      device->drvq.array_size + 1);
1411
1412                 device->generation++;
1413
1414                 SLIST_INSERT_HEAD(periph_head, periph, periph_links);
1415                 crit_exit();
1416         }
1417
1418         xsoftc.generation++;
1419
1420         return (status);
1421 }
1422
1423 void
1424 xpt_remove_periph(struct cam_periph *periph)
1425 {
1426         struct cam_ed *device;
1427
1428         device = periph->path->device;
1429
1430         if (device != NULL) {
1431                 struct periph_list *periph_head;
1432
1433                 periph_head = &device->periphs;
1434                 
1435                 /* Release the slot for this peripheral */
1436                 crit_enter();
1437                 camq_resize(&device->drvq, device->drvq.array_size - 1);
1438
1439                 device->generation++;
1440
1441                 SLIST_REMOVE(periph_head, periph, cam_periph, periph_links);
1442                 crit_exit();
1443         }
1444
1445         xsoftc.generation++;
1446
1447 }
1448
1449 void
1450 xpt_announce_periph(struct cam_periph *periph, char *announce_string)
1451 {
1452         u_int mb;
1453         struct cam_path *path;
1454         struct ccb_trans_settings cts;
1455
1456         path = periph->path;
1457         /*
1458          * To ensure that this is printed in one piece,
1459          * mask out CAM interrupts.
1460          */
1461         crit_enter();
1462         printf("%s%d at %s%d bus %d target %d lun %d\n",
1463                periph->periph_name, periph->unit_number,
1464                path->bus->sim->sim_name,
1465                path->bus->sim->unit_number,
1466                path->bus->sim->bus_id,
1467                path->target->target_id,
1468                path->device->lun_id);
1469         printf("%s%d: ", periph->periph_name, periph->unit_number);
1470         scsi_print_inquiry(&path->device->inq_data);
1471         if ((bootverbose)
1472          && (path->device->serial_num_len > 0)) {
1473                 /* Don't wrap the screen  - print only the first 60 chars */
1474                 printf("%s%d: Serial Number %.60s\n", periph->periph_name,
1475                        periph->unit_number, path->device->serial_num);
1476         }
1477         xpt_setup_ccb(&cts.ccb_h, path, /*priority*/1);
1478         cts.ccb_h.func_code = XPT_GET_TRAN_SETTINGS;
1479         cts.flags = CCB_TRANS_CURRENT_SETTINGS;
1480         xpt_action((union ccb*)&cts);
1481         if (cts.ccb_h.status == CAM_REQ_CMP) {
1482                 u_int speed;
1483                 u_int freq;
1484
1485                 if ((cts.valid & CCB_TRANS_SYNC_OFFSET_VALID) != 0
1486                   && cts.sync_offset != 0) {
1487                         freq = scsi_calc_syncsrate(cts.sync_period);
1488                         speed = freq;
1489                 } else {
1490                         struct ccb_pathinq cpi;
1491
1492                         /* Ask the SIM for its base transfer speed */
1493                         xpt_setup_ccb(&cpi.ccb_h, path, /*priority*/1);
1494                         cpi.ccb_h.func_code = XPT_PATH_INQ;
1495                         xpt_action((union ccb *)&cpi);
1496
1497                         speed = cpi.base_transfer_speed;
1498                         freq = 0;
1499                 }
1500                 if ((cts.valid & CCB_TRANS_BUS_WIDTH_VALID) != 0)
1501                         speed *= (0x01 << cts.bus_width);
1502                 mb = speed / 1000;
1503                 if (mb > 0)
1504                         printf("%s%d: %d.%03dMB/s transfers",
1505                                periph->periph_name, periph->unit_number,
1506                                mb, speed % 1000);
1507                 else
1508                         printf("%s%d: %dKB/s transfers", periph->periph_name,
1509                                periph->unit_number, speed);
1510                 if ((cts.valid & CCB_TRANS_SYNC_OFFSET_VALID) != 0
1511                  && cts.sync_offset != 0) {
1512                         printf(" (%d.%03dMHz, offset %d", freq / 1000,
1513                                freq % 1000, cts.sync_offset);
1514                 }
1515                 if ((cts.valid & CCB_TRANS_BUS_WIDTH_VALID) != 0
1516                  && cts.bus_width > 0) {
1517                         if ((cts.valid & CCB_TRANS_SYNC_OFFSET_VALID) != 0
1518                          && cts.sync_offset != 0) {
1519                                 printf(", ");
1520                         } else {
1521                                 printf(" (");
1522                         }
1523                         printf("%dbit)", 8 * (0x01 << cts.bus_width));
1524                 } else if ((cts.valid & CCB_TRANS_SYNC_OFFSET_VALID) != 0
1525                         && cts.sync_offset != 0) {
1526                         printf(")");
1527                 }
1528
1529                 if (path->device->inq_flags & SID_CmdQue
1530                  || path->device->flags & CAM_DEV_TAG_AFTER_COUNT) {
1531                         printf(", Tagged Queueing Enabled");
1532                 }
1533
1534                 printf("\n");
1535         } else if (path->device->inq_flags & SID_CmdQue
1536                 || path->device->flags & CAM_DEV_TAG_AFTER_COUNT) {
1537                 printf("%s%d: Tagged Queueing Enabled\n",
1538                        periph->periph_name, periph->unit_number);
1539         }
1540
1541         /*
1542          * We only want to print the caller's announce string if they've
1543          * passed one in..
1544          */
1545         if (announce_string != NULL)
1546                 printf("%s%d: %s\n", periph->periph_name,
1547                        periph->unit_number, announce_string);
1548         crit_exit();
1549 }
1550
1551
1552 static dev_match_ret
1553 xptbusmatch(struct dev_match_pattern *patterns, int num_patterns,
1554             struct cam_eb *bus)
1555 {
1556         dev_match_ret retval;
1557         int i;
1558
1559         retval = DM_RET_NONE;
1560
1561         /*
1562          * If we aren't given something to match against, that's an error.
1563          */
1564         if (bus == NULL)
1565                 return(DM_RET_ERROR);
1566
1567         /*
1568          * If there are no match entries, then this bus matches no
1569          * matter what.
1570          */
1571         if ((patterns == NULL) || (num_patterns == 0))
1572                 return(DM_RET_DESCEND | DM_RET_COPY);
1573
1574         for (i = 0; i < num_patterns; i++) {
1575                 struct bus_match_pattern *cur_pattern;
1576
1577                 /*
1578                  * If the pattern in question isn't for a bus node, we
1579                  * aren't interested.  However, we do indicate to the
1580                  * calling routine that we should continue descending the
1581                  * tree, since the user wants to match against lower-level
1582                  * EDT elements.
1583                  */
1584                 if (patterns[i].type != DEV_MATCH_BUS) {
1585                         if ((retval & DM_RET_ACTION_MASK) == DM_RET_NONE)
1586                                 retval |= DM_RET_DESCEND;
1587                         continue;
1588                 }
1589
1590                 cur_pattern = &patterns[i].pattern.bus_pattern;
1591
1592                 /*
1593                  * If they want to match any bus node, we give them any
1594                  * device node.
1595                  */
1596                 if (cur_pattern->flags == BUS_MATCH_ANY) {
1597                         /* set the copy flag */
1598                         retval |= DM_RET_COPY;
1599
1600                         /*
1601                          * If we've already decided on an action, go ahead
1602                          * and return.
1603                          */
1604                         if ((retval & DM_RET_ACTION_MASK) != DM_RET_NONE)
1605                                 return(retval);
1606                 }
1607
1608                 /*
1609                  * Not sure why someone would do this...
1610                  */
1611                 if (cur_pattern->flags == BUS_MATCH_NONE)
1612                         continue;
1613
1614                 if (((cur_pattern->flags & BUS_MATCH_PATH) != 0)
1615                  && (cur_pattern->path_id != bus->path_id))
1616                         continue;
1617
1618                 if (((cur_pattern->flags & BUS_MATCH_BUS_ID) != 0)
1619                  && (cur_pattern->bus_id != bus->sim->bus_id))
1620                         continue;
1621
1622                 if (((cur_pattern->flags & BUS_MATCH_UNIT) != 0)
1623                  && (cur_pattern->unit_number != bus->sim->unit_number))
1624                         continue;
1625
1626                 if (((cur_pattern->flags & BUS_MATCH_NAME) != 0)
1627                  && (strncmp(cur_pattern->dev_name, bus->sim->sim_name,
1628                              DEV_IDLEN) != 0))
1629                         continue;
1630
1631                 /*
1632                  * If we get to this point, the user definitely wants 
1633                  * information on this bus.  So tell the caller to copy the
1634                  * data out.
1635                  */
1636                 retval |= DM_RET_COPY;
1637
1638                 /*
1639                  * If the return action has been set to descend, then we
1640                  * know that we've already seen a non-bus matching
1641                  * expression, therefore we need to further descend the tree.
1642                  * This won't change by continuing around the loop, so we
1643                  * go ahead and return.  If we haven't seen a non-bus
1644                  * matching expression, we keep going around the loop until
1645                  * we exhaust the matching expressions.  We'll set the stop
1646                  * flag once we fall out of the loop.
1647                  */
1648                 if ((retval & DM_RET_ACTION_MASK) == DM_RET_DESCEND)
1649                         return(retval);
1650         }
1651
1652         /*
1653          * If the return action hasn't been set to descend yet, that means
1654          * we haven't seen anything other than bus matching patterns.  So
1655          * tell the caller to stop descending the tree -- the user doesn't
1656          * want to match against lower level tree elements.
1657          */
1658         if ((retval & DM_RET_ACTION_MASK) == DM_RET_NONE)
1659                 retval |= DM_RET_STOP;
1660
1661         return(retval);
1662 }
1663
1664 static dev_match_ret
1665 xptdevicematch(struct dev_match_pattern *patterns, int num_patterns,
1666                struct cam_ed *device)
1667 {
1668         dev_match_ret retval;
1669         int i;
1670
1671         retval = DM_RET_NONE;
1672
1673         /*
1674          * If we aren't given something to match against, that's an error.
1675          */
1676         if (device == NULL)
1677                 return(DM_RET_ERROR);
1678
1679         /*
1680          * If there are no match entries, then this device matches no
1681          * matter what.
1682          */
1683         if ((patterns == NULL) || (patterns == 0))
1684                 return(DM_RET_DESCEND | DM_RET_COPY);
1685
1686         for (i = 0; i < num_patterns; i++) {
1687                 struct device_match_pattern *cur_pattern;
1688
1689                 /*
1690                  * If the pattern in question isn't for a device node, we
1691                  * aren't interested.
1692                  */
1693                 if (patterns[i].type != DEV_MATCH_DEVICE) {
1694                         if ((patterns[i].type == DEV_MATCH_PERIPH)
1695                          && ((retval & DM_RET_ACTION_MASK) == DM_RET_NONE))
1696                                 retval |= DM_RET_DESCEND;
1697                         continue;
1698                 }
1699
1700                 cur_pattern = &patterns[i].pattern.device_pattern;
1701
1702                 /*
1703                  * If they want to match any device node, we give them any
1704                  * device node.
1705                  */
1706                 if (cur_pattern->flags == DEV_MATCH_ANY) {
1707                         /* set the copy flag */
1708                         retval |= DM_RET_COPY;
1709
1710                         
1711                         /*
1712                          * If we've already decided on an action, go ahead
1713                          * and return.
1714                          */
1715                         if ((retval & DM_RET_ACTION_MASK) != DM_RET_NONE)
1716                                 return(retval);
1717                 }
1718
1719                 /*
1720                  * Not sure why someone would do this...
1721                  */
1722                 if (cur_pattern->flags == DEV_MATCH_NONE)
1723                         continue;
1724
1725                 if (((cur_pattern->flags & DEV_MATCH_PATH) != 0)
1726                  && (cur_pattern->path_id != device->target->bus->path_id))
1727                         continue;
1728
1729                 if (((cur_pattern->flags & DEV_MATCH_TARGET) != 0)
1730                  && (cur_pattern->target_id != device->target->target_id))
1731                         continue;
1732
1733                 if (((cur_pattern->flags & DEV_MATCH_LUN) != 0)
1734                  && (cur_pattern->target_lun != device->lun_id))
1735                         continue;
1736
1737                 if (((cur_pattern->flags & DEV_MATCH_INQUIRY) != 0)
1738                  && (cam_quirkmatch((caddr_t)&device->inq_data,
1739                                     (caddr_t)&cur_pattern->inq_pat,
1740                                     1, sizeof(cur_pattern->inq_pat),
1741                                     scsi_static_inquiry_match) == NULL))
1742                         continue;
1743
1744                 /*
1745                  * If we get to this point, the user definitely wants 
1746                  * information on this device.  So tell the caller to copy
1747                  * the data out.
1748                  */
1749                 retval |= DM_RET_COPY;
1750
1751                 /*
1752                  * If the return action has been set to descend, then we
1753                  * know that we've already seen a peripheral matching
1754                  * expression, therefore we need to further descend the tree.
1755                  * This won't change by continuing around the loop, so we
1756                  * go ahead and return.  If we haven't seen a peripheral
1757                  * matching expression, we keep going around the loop until
1758                  * we exhaust the matching expressions.  We'll set the stop
1759                  * flag once we fall out of the loop.
1760                  */
1761                 if ((retval & DM_RET_ACTION_MASK) == DM_RET_DESCEND)
1762                         return(retval);
1763         }
1764
1765         /*
1766          * If the return action hasn't been set to descend yet, that means
1767          * we haven't seen any peripheral matching patterns.  So tell the
1768          * caller to stop descending the tree -- the user doesn't want to
1769          * match against lower level tree elements.
1770          */
1771         if ((retval & DM_RET_ACTION_MASK) == DM_RET_NONE)
1772                 retval |= DM_RET_STOP;
1773
1774         return(retval);
1775 }
1776
1777 /*
1778  * Match a single peripheral against any number of match patterns.
1779  */
1780 static dev_match_ret
1781 xptperiphmatch(struct dev_match_pattern *patterns, int num_patterns,
1782                struct cam_periph *periph)
1783 {
1784         dev_match_ret retval;
1785         int i;
1786
1787         /*
1788          * If we aren't given something to match against, that's an error.
1789          */
1790         if (periph == NULL)
1791                 return(DM_RET_ERROR);
1792
1793         /*
1794          * If there are no match entries, then this peripheral matches no
1795          * matter what.
1796          */
1797         if ((patterns == NULL) || (num_patterns == 0))
1798                 return(DM_RET_STOP | DM_RET_COPY);
1799
1800         /*
1801          * There aren't any nodes below a peripheral node, so there's no
1802          * reason to descend the tree any further.
1803          */
1804         retval = DM_RET_STOP;
1805
1806         for (i = 0; i < num_patterns; i++) {
1807                 struct periph_match_pattern *cur_pattern;
1808
1809                 /*
1810                  * If the pattern in question isn't for a peripheral, we
1811                  * aren't interested.
1812                  */
1813                 if (patterns[i].type != DEV_MATCH_PERIPH)
1814                         continue;
1815
1816                 cur_pattern = &patterns[i].pattern.periph_pattern;
1817
1818                 /*
1819                  * If they want to match on anything, then we will do so.
1820                  */
1821                 if (cur_pattern->flags == PERIPH_MATCH_ANY) {
1822                         /* set the copy flag */
1823                         retval |= DM_RET_COPY;
1824
1825                         /*
1826                          * We've already set the return action to stop,
1827                          * since there are no nodes below peripherals in
1828                          * the tree.
1829                          */
1830                         return(retval);
1831                 }
1832
1833                 /*
1834                  * Not sure why someone would do this...
1835                  */
1836                 if (cur_pattern->flags == PERIPH_MATCH_NONE)
1837                         continue;
1838
1839                 if (((cur_pattern->flags & PERIPH_MATCH_PATH) != 0)
1840                  && (cur_pattern->path_id != periph->path->bus->path_id))
1841                         continue;
1842
1843                 /*
1844                  * For the target and lun id's, we have to make sure the
1845                  * target and lun pointers aren't NULL.  The xpt peripheral
1846                  * has a wildcard target and device.
1847                  */
1848                 if (((cur_pattern->flags & PERIPH_MATCH_TARGET) != 0)
1849                  && ((periph->path->target == NULL)
1850                  ||(cur_pattern->target_id != periph->path->target->target_id)))
1851                         continue;
1852
1853                 if (((cur_pattern->flags & PERIPH_MATCH_LUN) != 0)
1854                  && ((periph->path->device == NULL)
1855                  || (cur_pattern->target_lun != periph->path->device->lun_id)))
1856                         continue;
1857
1858                 if (((cur_pattern->flags & PERIPH_MATCH_UNIT) != 0)
1859                  && (cur_pattern->unit_number != periph->unit_number))
1860                         continue;
1861
1862                 if (((cur_pattern->flags & PERIPH_MATCH_NAME) != 0)
1863                  && (strncmp(cur_pattern->periph_name, periph->periph_name,
1864                              DEV_IDLEN) != 0))
1865                         continue;
1866
1867                 /*
1868                  * If we get to this point, the user definitely wants 
1869                  * information on this peripheral.  So tell the caller to
1870                  * copy the data out.
1871                  */
1872                 retval |= DM_RET_COPY;
1873
1874                 /*
1875                  * The return action has already been set to stop, since
1876                  * peripherals don't have any nodes below them in the EDT.
1877                  */
1878                 return(retval);
1879         }
1880
1881         /*
1882          * If we get to this point, the peripheral that was passed in
1883          * doesn't match any of the patterns.
1884          */
1885         return(retval);
1886 }
1887
1888 static int
1889 xptedtbusfunc(struct cam_eb *bus, void *arg)
1890 {
1891         struct ccb_dev_match *cdm;
1892         dev_match_ret retval;
1893
1894         cdm = (struct ccb_dev_match *)arg;
1895
1896         /*
1897          * If our position is for something deeper in the tree, that means
1898          * that we've already seen this node.  So, we keep going down.
1899          */
1900         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
1901          && (cdm->pos.cookie.bus == bus)
1902          && (cdm->pos.position_type & CAM_DEV_POS_TARGET)
1903          && (cdm->pos.cookie.target != NULL))
1904                 retval = DM_RET_DESCEND;
1905         else
1906                 retval = xptbusmatch(cdm->patterns, cdm->num_patterns, bus);
1907
1908         /*
1909          * If we got an error, bail out of the search.
1910          */
1911         if ((retval & DM_RET_ACTION_MASK) == DM_RET_ERROR) {
1912                 cdm->status = CAM_DEV_MATCH_ERROR;
1913                 return(0);
1914         }
1915
1916         /*
1917          * If the copy flag is set, copy this bus out.
1918          */
1919         if (retval & DM_RET_COPY) {
1920                 int spaceleft, j;
1921
1922                 spaceleft = cdm->match_buf_len - (cdm->num_matches *
1923                         sizeof(struct dev_match_result));
1924
1925                 /*
1926                  * If we don't have enough space to put in another
1927                  * match result, save our position and tell the
1928                  * user there are more devices to check.
1929                  */
1930                 if (spaceleft < sizeof(struct dev_match_result)) {
1931                         bzero(&cdm->pos, sizeof(cdm->pos));
1932                         cdm->pos.position_type = 
1933                                 CAM_DEV_POS_EDT | CAM_DEV_POS_BUS;
1934
1935                         cdm->pos.cookie.bus = bus;
1936                         cdm->pos.generations[CAM_BUS_GENERATION]=
1937                                 bus_generation;
1938                         cdm->status = CAM_DEV_MATCH_MORE;
1939                         return(0);
1940                 }
1941                 j = cdm->num_matches;
1942                 cdm->num_matches++;
1943                 cdm->matches[j].type = DEV_MATCH_BUS;
1944                 cdm->matches[j].result.bus_result.path_id = bus->path_id;
1945                 cdm->matches[j].result.bus_result.bus_id = bus->sim->bus_id;
1946                 cdm->matches[j].result.bus_result.unit_number =
1947                         bus->sim->unit_number;
1948                 strncpy(cdm->matches[j].result.bus_result.dev_name,
1949                         bus->sim->sim_name, DEV_IDLEN);
1950         }
1951
1952         /*
1953          * If the user is only interested in busses, there's no
1954          * reason to descend to the next level in the tree.
1955          */
1956         if ((retval & DM_RET_ACTION_MASK) == DM_RET_STOP)
1957                 return(1);
1958
1959         /*
1960          * If there is a target generation recorded, check it to
1961          * make sure the target list hasn't changed.
1962          */
1963         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
1964          && (bus == cdm->pos.cookie.bus)
1965          && (cdm->pos.position_type & CAM_DEV_POS_TARGET)
1966          && (cdm->pos.generations[CAM_TARGET_GENERATION] != 0)
1967          && (cdm->pos.generations[CAM_TARGET_GENERATION] !=
1968              bus->generation)) {
1969                 cdm->status = CAM_DEV_MATCH_LIST_CHANGED;
1970                 return(0);
1971         }
1972
1973         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
1974          && (cdm->pos.cookie.bus == bus)
1975          && (cdm->pos.position_type & CAM_DEV_POS_TARGET)
1976          && (cdm->pos.cookie.target != NULL))
1977                 return(xpttargettraverse(bus,
1978                                         (struct cam_et *)cdm->pos.cookie.target,
1979                                          xptedttargetfunc, arg));
1980         else
1981                 return(xpttargettraverse(bus, NULL, xptedttargetfunc, arg));
1982 }
1983
1984 static int
1985 xptedttargetfunc(struct cam_et *target, void *arg)
1986 {
1987         struct ccb_dev_match *cdm;
1988
1989         cdm = (struct ccb_dev_match *)arg;
1990
1991         /*
1992          * If there is a device list generation recorded, check it to
1993          * make sure the device list hasn't changed.
1994          */
1995         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
1996          && (cdm->pos.cookie.bus == target->bus)
1997          && (cdm->pos.position_type & CAM_DEV_POS_TARGET)
1998          && (cdm->pos.cookie.target == target)
1999          && (cdm->pos.position_type & CAM_DEV_POS_DEVICE)
2000          && (cdm->pos.generations[CAM_DEV_GENERATION] != 0)
2001          && (cdm->pos.generations[CAM_DEV_GENERATION] !=
2002              target->generation)) {
2003                 cdm->status = CAM_DEV_MATCH_LIST_CHANGED;
2004                 return(0);
2005         }
2006
2007         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
2008          && (cdm->pos.cookie.bus == target->bus)
2009          && (cdm->pos.position_type & CAM_DEV_POS_TARGET)
2010          && (cdm->pos.cookie.target == target)
2011          && (cdm->pos.position_type & CAM_DEV_POS_DEVICE)
2012          && (cdm->pos.cookie.device != NULL))
2013                 return(xptdevicetraverse(target,
2014                                         (struct cam_ed *)cdm->pos.cookie.device,
2015                                          xptedtdevicefunc, arg));
2016         else
2017                 return(xptdevicetraverse(target, NULL, xptedtdevicefunc, arg));
2018 }
2019
2020 static int
2021 xptedtdevicefunc(struct cam_ed *device, void *arg)
2022 {
2023
2024         struct ccb_dev_match *cdm;
2025         dev_match_ret retval;
2026
2027         cdm = (struct ccb_dev_match *)arg;
2028
2029         /*
2030          * If our position is for something deeper in the tree, that means
2031          * that we've already seen this node.  So, we keep going down.
2032          */
2033         if ((cdm->pos.position_type & CAM_DEV_POS_DEVICE)
2034          && (cdm->pos.cookie.device == device)
2035          && (cdm->pos.position_type & CAM_DEV_POS_PERIPH)
2036          && (cdm->pos.cookie.periph != NULL))
2037                 retval = DM_RET_DESCEND;
2038         else
2039                 retval = xptdevicematch(cdm->patterns, cdm->num_patterns,
2040                                         device);
2041
2042         if ((retval & DM_RET_ACTION_MASK) == DM_RET_ERROR) {
2043                 cdm->status = CAM_DEV_MATCH_ERROR;
2044                 return(0);
2045         }
2046
2047         /*
2048          * If the copy flag is set, copy this device out.
2049          */
2050         if (retval & DM_RET_COPY) {
2051                 int spaceleft, j;
2052
2053                 spaceleft = cdm->match_buf_len - (cdm->num_matches *
2054                         sizeof(struct dev_match_result));
2055
2056                 /*
2057                  * If we don't have enough space to put in another
2058                  * match result, save our position and tell the
2059                  * user there are more devices to check.
2060                  */
2061                 if (spaceleft < sizeof(struct dev_match_result)) {
2062                         bzero(&cdm->pos, sizeof(cdm->pos));
2063                         cdm->pos.position_type = 
2064                                 CAM_DEV_POS_EDT | CAM_DEV_POS_BUS |
2065                                 CAM_DEV_POS_TARGET | CAM_DEV_POS_DEVICE;
2066
2067                         cdm->pos.cookie.bus = device->target->bus;
2068                         cdm->pos.generations[CAM_BUS_GENERATION]=
2069                                 bus_generation;
2070                         cdm->pos.cookie.target = device->target;
2071                         cdm->pos.generations[CAM_TARGET_GENERATION] =
2072                                 device->target->bus->generation;
2073                         cdm->pos.cookie.device = device;
2074                         cdm->pos.generations[CAM_DEV_GENERATION] = 
2075                                 device->target->generation;
2076                         cdm->status = CAM_DEV_MATCH_MORE;
2077                         return(0);
2078                 }
2079                 j = cdm->num_matches;
2080                 cdm->num_matches++;
2081                 cdm->matches[j].type = DEV_MATCH_DEVICE;
2082                 cdm->matches[j].result.device_result.path_id =
2083                         device->target->bus->path_id;
2084                 cdm->matches[j].result.device_result.target_id =
2085                         device->target->target_id;
2086                 cdm->matches[j].result.device_result.target_lun =
2087                         device->lun_id;
2088                 bcopy(&device->inq_data,
2089                       &cdm->matches[j].result.device_result.inq_data,
2090                       sizeof(struct scsi_inquiry_data));
2091
2092                 /* Let the user know whether this device is unconfigured */
2093                 if (device->flags & CAM_DEV_UNCONFIGURED)
2094                         cdm->matches[j].result.device_result.flags =
2095                                 DEV_RESULT_UNCONFIGURED;
2096                 else
2097                         cdm->matches[j].result.device_result.flags =
2098                                 DEV_RESULT_NOFLAG;
2099         }
2100
2101         /*
2102          * If the user isn't interested in peripherals, don't descend
2103          * the tree any further.
2104          */
2105         if ((retval & DM_RET_ACTION_MASK) == DM_RET_STOP)
2106                 return(1);
2107
2108         /*
2109          * If there is a peripheral list generation recorded, make sure
2110          * it hasn't changed.
2111          */
2112         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
2113          && (device->target->bus == cdm->pos.cookie.bus)
2114          && (cdm->pos.position_type & CAM_DEV_POS_TARGET)
2115          && (device->target == cdm->pos.cookie.target)
2116          && (cdm->pos.position_type & CAM_DEV_POS_DEVICE)
2117          && (device == cdm->pos.cookie.device)
2118          && (cdm->pos.position_type & CAM_DEV_POS_PERIPH)
2119          && (cdm->pos.generations[CAM_PERIPH_GENERATION] != 0)
2120          && (cdm->pos.generations[CAM_PERIPH_GENERATION] !=
2121              device->generation)){
2122                 cdm->status = CAM_DEV_MATCH_LIST_CHANGED;
2123                 return(0);
2124         }
2125
2126         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
2127          && (cdm->pos.cookie.bus == device->target->bus)
2128          && (cdm->pos.position_type & CAM_DEV_POS_TARGET)
2129          && (cdm->pos.cookie.target == device->target)
2130          && (cdm->pos.position_type & CAM_DEV_POS_DEVICE)
2131          && (cdm->pos.cookie.device == device)
2132          && (cdm->pos.position_type & CAM_DEV_POS_PERIPH)
2133          && (cdm->pos.cookie.periph != NULL))
2134                 return(xptperiphtraverse(device,
2135                                 (struct cam_periph *)cdm->pos.cookie.periph,
2136                                 xptedtperiphfunc, arg));
2137         else
2138                 return(xptperiphtraverse(device, NULL, xptedtperiphfunc, arg));
2139 }
2140
2141 static int
2142 xptedtperiphfunc(struct cam_periph *periph, void *arg)
2143 {
2144         struct ccb_dev_match *cdm;
2145         dev_match_ret retval;
2146
2147         cdm = (struct ccb_dev_match *)arg;
2148
2149         retval = xptperiphmatch(cdm->patterns, cdm->num_patterns, periph);
2150
2151         if ((retval & DM_RET_ACTION_MASK) == DM_RET_ERROR) {
2152                 cdm->status = CAM_DEV_MATCH_ERROR;
2153                 return(0);
2154         }
2155
2156         /*
2157          * If the copy flag is set, copy this peripheral out.
2158          */
2159         if (retval & DM_RET_COPY) {
2160                 int spaceleft, j;
2161
2162                 spaceleft = cdm->match_buf_len - (cdm->num_matches *
2163                         sizeof(struct dev_match_result));
2164
2165                 /*
2166                  * If we don't have enough space to put in another
2167                  * match result, save our position and tell the
2168                  * user there are more devices to check.
2169                  */
2170                 if (spaceleft < sizeof(struct dev_match_result)) {
2171                         bzero(&cdm->pos, sizeof(cdm->pos));
2172                         cdm->pos.position_type = 
2173                                 CAM_DEV_POS_EDT | CAM_DEV_POS_BUS |
2174                                 CAM_DEV_POS_TARGET | CAM_DEV_POS_DEVICE |
2175                                 CAM_DEV_POS_PERIPH;
2176
2177                         cdm->pos.cookie.bus = periph->path->bus;
2178                         cdm->pos.generations[CAM_BUS_GENERATION]=
2179                                 bus_generation;
2180                         cdm->pos.cookie.target = periph->path->target;
2181                         cdm->pos.generations[CAM_TARGET_GENERATION] =
2182                                 periph->path->bus->generation;
2183                         cdm->pos.cookie.device = periph->path->device;
2184                         cdm->pos.generations[CAM_DEV_GENERATION] = 
2185                                 periph->path->target->generation;
2186                         cdm->pos.cookie.periph = periph;
2187                         cdm->pos.generations[CAM_PERIPH_GENERATION] =
2188                                 periph->path->device->generation;
2189                         cdm->status = CAM_DEV_MATCH_MORE;
2190                         return(0);
2191                 }
2192
2193                 j = cdm->num_matches;
2194                 cdm->num_matches++;
2195                 cdm->matches[j].type = DEV_MATCH_PERIPH;
2196                 cdm->matches[j].result.periph_result.path_id =
2197                         periph->path->bus->path_id;
2198                 cdm->matches[j].result.periph_result.target_id =
2199                         periph->path->target->target_id;
2200                 cdm->matches[j].result.periph_result.target_lun =
2201                         periph->path->device->lun_id;
2202                 cdm->matches[j].result.periph_result.unit_number =
2203                         periph->unit_number;
2204                 strncpy(cdm->matches[j].result.periph_result.periph_name,
2205                         periph->periph_name, DEV_IDLEN);
2206         }
2207
2208         return(1);
2209 }
2210
2211 static int
2212 xptedtmatch(struct ccb_dev_match *cdm)
2213 {
2214         int ret;
2215
2216         cdm->num_matches = 0;
2217
2218         /*
2219          * Check the bus list generation.  If it has changed, the user
2220          * needs to reset everything and start over.
2221          */
2222         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
2223          && (cdm->pos.generations[CAM_BUS_GENERATION] != 0)
2224          && (cdm->pos.generations[CAM_BUS_GENERATION] != bus_generation)) {
2225                 cdm->status = CAM_DEV_MATCH_LIST_CHANGED;
2226                 return(0);
2227         }
2228
2229         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
2230          && (cdm->pos.cookie.bus != NULL))
2231                 ret = xptbustraverse((struct cam_eb *)cdm->pos.cookie.bus,
2232                                      xptedtbusfunc, cdm);
2233         else
2234                 ret = xptbustraverse(NULL, xptedtbusfunc, cdm);
2235
2236         /*
2237          * If we get back 0, that means that we had to stop before fully
2238          * traversing the EDT.  It also means that one of the subroutines
2239          * has set the status field to the proper value.  If we get back 1,
2240          * we've fully traversed the EDT and copied out any matching entries.
2241          */
2242         if (ret == 1)
2243                 cdm->status = CAM_DEV_MATCH_LAST;
2244
2245         return(ret);
2246 }
2247
2248 static int
2249 xptplistpdrvfunc(struct periph_driver **pdrv, void *arg)
2250 {
2251         struct ccb_dev_match *cdm;
2252
2253         cdm = (struct ccb_dev_match *)arg;
2254
2255         if ((cdm->pos.position_type & CAM_DEV_POS_PDPTR)
2256          && (cdm->pos.cookie.pdrv == pdrv)
2257          && (cdm->pos.position_type & CAM_DEV_POS_PERIPH)
2258          && (cdm->pos.generations[CAM_PERIPH_GENERATION] != 0)
2259          && (cdm->pos.generations[CAM_PERIPH_GENERATION] !=
2260              (*pdrv)->generation)) {
2261                 cdm->status = CAM_DEV_MATCH_LIST_CHANGED;
2262                 return(0);
2263         }
2264
2265         if ((cdm->pos.position_type & CAM_DEV_POS_PDPTR)
2266          && (cdm->pos.cookie.pdrv == pdrv)
2267          && (cdm->pos.position_type & CAM_DEV_POS_PERIPH)
2268          && (cdm->pos.cookie.periph != NULL))
2269                 return(xptpdperiphtraverse(pdrv,
2270                                 (struct cam_periph *)cdm->pos.cookie.periph,
2271                                 xptplistperiphfunc, arg));
2272         else
2273                 return(xptpdperiphtraverse(pdrv, NULL,xptplistperiphfunc, arg));
2274 }
2275
2276 static int
2277 xptplistperiphfunc(struct cam_periph *periph, void *arg)
2278 {
2279         struct ccb_dev_match *cdm;
2280         dev_match_ret retval;
2281
2282         cdm = (struct ccb_dev_match *)arg;
2283
2284         retval = xptperiphmatch(cdm->patterns, cdm->num_patterns, periph);
2285
2286         if ((retval & DM_RET_ACTION_MASK) == DM_RET_ERROR) {
2287                 cdm->status = CAM_DEV_MATCH_ERROR;
2288                 return(0);
2289         }
2290
2291         /*
2292          * If the copy flag is set, copy this peripheral out.
2293          */
2294         if (retval & DM_RET_COPY) {
2295                 int spaceleft, j;
2296
2297                 spaceleft = cdm->match_buf_len - (cdm->num_matches *
2298                         sizeof(struct dev_match_result));
2299
2300                 /*
2301                  * If we don't have enough space to put in another
2302                  * match result, save our position and tell the
2303                  * user there are more devices to check.
2304                  */
2305                 if (spaceleft < sizeof(struct dev_match_result)) {
2306                         struct periph_driver **pdrv;
2307
2308                         pdrv = NULL;
2309                         bzero(&cdm->pos, sizeof(cdm->pos));
2310                         cdm->pos.position_type = 
2311                                 CAM_DEV_POS_PDRV | CAM_DEV_POS_PDPTR |
2312                                 CAM_DEV_POS_PERIPH;
2313
2314                         /*
2315                          * This may look a bit non-sensical, but it is
2316                          * actually quite logical.  There are very few
2317                          * peripheral drivers, and bloating every peripheral
2318                          * structure with a pointer back to its parent
2319                          * peripheral driver linker set entry would cost
2320                          * more in the long run than doing this quick lookup.
2321                          */
2322                         SET_FOREACH(pdrv, periphdriver_set) {
2323                                 if (strcmp((*pdrv)->driver_name,
2324                                     periph->periph_name) == 0)
2325                                         break;
2326                         }
2327
2328                         if (*pdrv == NULL) {
2329                                 cdm->status = CAM_DEV_MATCH_ERROR;
2330                                 return(0);
2331                         }
2332
2333                         cdm->pos.cookie.pdrv = pdrv;
2334                         /*
2335                          * The periph generation slot does double duty, as
2336                          * does the periph pointer slot.  They are used for
2337                          * both edt and pdrv lookups and positioning.
2338                          */
2339                         cdm->pos.cookie.periph = periph;
2340                         cdm->pos.generations[CAM_PERIPH_GENERATION] =
2341                                 (*pdrv)->generation;
2342                         cdm->status = CAM_DEV_MATCH_MORE;
2343                         return(0);
2344                 }
2345
2346                 j = cdm->num_matches;
2347                 cdm->num_matches++;
2348                 cdm->matches[j].type = DEV_MATCH_PERIPH;
2349                 cdm->matches[j].result.periph_result.path_id =
2350                         periph->path->bus->path_id;
2351
2352                 /*
2353                  * The transport layer peripheral doesn't have a target or
2354                  * lun.
2355                  */
2356                 if (periph->path->target)
2357                         cdm->matches[j].result.periph_result.target_id =
2358                                 periph->path->target->target_id;
2359                 else
2360                         cdm->matches[j].result.periph_result.target_id = -1;
2361
2362                 if (periph->path->device)
2363                         cdm->matches[j].result.periph_result.target_lun =
2364                                 periph->path->device->lun_id;
2365                 else
2366                         cdm->matches[j].result.periph_result.target_lun = -1;
2367
2368                 cdm->matches[j].result.periph_result.unit_number =
2369                         periph->unit_number;
2370                 strncpy(cdm->matches[j].result.periph_result.periph_name,
2371                         periph->periph_name, DEV_IDLEN);
2372         }
2373
2374         return(1);
2375 }
2376
2377 static int
2378 xptperiphlistmatch(struct ccb_dev_match *cdm)
2379 {
2380         int ret;
2381
2382         cdm->num_matches = 0;
2383
2384         /*
2385          * At this point in the edt traversal function, we check the bus
2386          * list generation to make sure that no busses have been added or
2387          * removed since the user last sent a XPT_DEV_MATCH ccb through.
2388          * For the peripheral driver list traversal function, however, we
2389          * don't have to worry about new peripheral driver types coming or
2390          * going; they're in a linker set, and therefore can't change
2391          * without a recompile.
2392          */
2393
2394         if ((cdm->pos.position_type & CAM_DEV_POS_PDPTR)
2395          && (cdm->pos.cookie.pdrv != NULL))
2396                 ret = xptpdrvtraverse(
2397                                 (struct periph_driver **)cdm->pos.cookie.pdrv,
2398                                 xptplistpdrvfunc, cdm);
2399         else
2400                 ret = xptpdrvtraverse(NULL, xptplistpdrvfunc, cdm);
2401
2402         /*
2403          * If we get back 0, that means that we had to stop before fully
2404          * traversing the peripheral driver tree.  It also means that one of
2405          * the subroutines has set the status field to the proper value.  If
2406          * we get back 1, we've fully traversed the EDT and copied out any
2407          * matching entries.
2408          */
2409         if (ret == 1)
2410                 cdm->status = CAM_DEV_MATCH_LAST;
2411
2412         return(ret);
2413 }
2414
2415 static int
2416 xptbustraverse(struct cam_eb *start_bus, xpt_busfunc_t *tr_func, void *arg)
2417 {
2418         struct cam_eb *bus, *next_bus;
2419         int retval;
2420
2421         retval = 1;
2422
2423         for (bus = (start_bus ? start_bus : TAILQ_FIRST(&xpt_busses));
2424              bus != NULL;
2425              bus = next_bus) {
2426                 next_bus = TAILQ_NEXT(bus, links);
2427
2428                 retval = tr_func(bus, arg);
2429                 if (retval == 0)
2430                         return(retval);
2431         }
2432
2433         return(retval);
2434 }
2435
2436 static int
2437 xpttargettraverse(struct cam_eb *bus, struct cam_et *start_target,
2438                   xpt_targetfunc_t *tr_func, void *arg)
2439 {
2440         struct cam_et *target, *next_target;
2441         int retval;
2442
2443         retval = 1;
2444         for (target = (start_target ? start_target :
2445                        TAILQ_FIRST(&bus->et_entries));
2446              target != NULL; target = next_target) {
2447
2448                 next_target = TAILQ_NEXT(target, links);
2449
2450                 retval = tr_func(target, arg);
2451
2452                 if (retval == 0)
2453                         return(retval);
2454         }
2455
2456         return(retval);
2457 }
2458
2459 static int
2460 xptdevicetraverse(struct cam_et *target, struct cam_ed *start_device,
2461                   xpt_devicefunc_t *tr_func, void *arg)
2462 {
2463         struct cam_ed *device, *next_device;
2464         int retval;
2465
2466         retval = 1;
2467         for (device = (start_device ? start_device :
2468                        TAILQ_FIRST(&target->ed_entries));
2469              device != NULL;
2470              device = next_device) {
2471
2472                 next_device = TAILQ_NEXT(device, links);
2473
2474                 retval = tr_func(device, arg);
2475
2476                 if (retval == 0)
2477                         return(retval);
2478         }
2479
2480         return(retval);
2481 }
2482
2483 static int
2484 xptperiphtraverse(struct cam_ed *device, struct cam_periph *start_periph,
2485                   xpt_periphfunc_t *tr_func, void *arg)
2486 {
2487         struct cam_periph *periph, *next_periph;
2488         int retval;
2489
2490         retval = 1;
2491
2492         for (periph = (start_periph ? start_periph :
2493                        SLIST_FIRST(&device->periphs));
2494              periph != NULL;
2495              periph = next_periph) {
2496
2497                 next_periph = SLIST_NEXT(periph, periph_links);
2498
2499                 retval = tr_func(periph, arg);
2500                 if (retval == 0)
2501                         return(retval);
2502         }
2503
2504         return(retval);
2505 }
2506
2507 static int
2508 xptpdrvtraverse(struct periph_driver **start_pdrv,
2509                 xpt_pdrvfunc_t *tr_func, void *arg)
2510 {
2511         struct periph_driver **pdrv;
2512         int retval;
2513
2514         retval = 1;
2515
2516         /*
2517          * We don't traverse the peripheral driver list like we do the
2518          * other lists, because it is a linker set, and therefore cannot be
2519          * changed during runtime.  If the peripheral driver list is ever
2520          * re-done to be something other than a linker set (i.e. it can
2521          * change while the system is running), the list traversal should
2522          * be modified to work like the other traversal functions.
2523          */
2524         SET_FOREACH(pdrv, periphdriver_set) {
2525                 if (start_pdrv == NULL || start_pdrv == pdrv) {
2526                         retval = tr_func(pdrv, arg);
2527                         if (retval == 0)
2528                                 return(retval);
2529                         start_pdrv = NULL; /* traverse remainder */
2530                 }
2531         }
2532         return(retval);
2533 }
2534
2535 static int
2536 xptpdperiphtraverse(struct periph_driver **pdrv,
2537                     struct cam_periph *start_periph,
2538                     xpt_periphfunc_t *tr_func, void *arg)
2539 {
2540         struct cam_periph *periph, *next_periph;
2541         int retval;
2542
2543         retval = 1;
2544
2545         for (periph = (start_periph ? start_periph :
2546              TAILQ_FIRST(&(*pdrv)->units)); periph != NULL;
2547              periph = next_periph) {
2548
2549                 next_periph = TAILQ_NEXT(periph, unit_links);
2550
2551                 retval = tr_func(periph, arg);
2552                 if (retval == 0)
2553                         return(retval);
2554         }
2555         return(retval);
2556 }
2557
2558 static int
2559 xptdefbusfunc(struct cam_eb *bus, void *arg)
2560 {
2561         struct xpt_traverse_config *tr_config;
2562
2563         tr_config = (struct xpt_traverse_config *)arg;
2564
2565         if (tr_config->depth == XPT_DEPTH_BUS) {
2566                 xpt_busfunc_t *tr_func;
2567
2568                 tr_func = (xpt_busfunc_t *)tr_config->tr_func;
2569
2570                 return(tr_func(bus, tr_config->tr_arg));
2571         } else
2572                 return(xpttargettraverse(bus, NULL, xptdeftargetfunc, arg));
2573 }
2574
2575 static int
2576 xptdeftargetfunc(struct cam_et *target, void *arg)
2577 {
2578         struct xpt_traverse_config *tr_config;
2579
2580         tr_config = (struct xpt_traverse_config *)arg;
2581
2582         if (tr_config->depth == XPT_DEPTH_TARGET) {
2583                 xpt_targetfunc_t *tr_func;
2584
2585                 tr_func = (xpt_targetfunc_t *)tr_config->tr_func;
2586
2587                 return(tr_func(target, tr_config->tr_arg));
2588         } else
2589                 return(xptdevicetraverse(target, NULL, xptdefdevicefunc, arg));
2590 }
2591
2592 static int
2593 xptdefdevicefunc(struct cam_ed *device, void *arg)
2594 {
2595         struct xpt_traverse_config *tr_config;
2596
2597         tr_config = (struct xpt_traverse_config *)arg;
2598
2599         if (tr_config->depth == XPT_DEPTH_DEVICE) {
2600                 xpt_devicefunc_t *tr_func;
2601
2602                 tr_func = (xpt_devicefunc_t *)tr_config->tr_func;
2603
2604                 return(tr_func(device, tr_config->tr_arg));
2605         } else
2606                 return(xptperiphtraverse(device, NULL, xptdefperiphfunc, arg));
2607 }
2608
2609 static int
2610 xptdefperiphfunc(struct cam_periph *periph, void *arg)
2611 {
2612         struct xpt_traverse_config *tr_config;
2613         xpt_periphfunc_t *tr_func;
2614
2615         tr_config = (struct xpt_traverse_config *)arg;
2616
2617         tr_func = (xpt_periphfunc_t *)tr_config->tr_func;
2618
2619         /*
2620          * Unlike the other default functions, we don't check for depth
2621          * here.  The peripheral driver level is the last level in the EDT,
2622          * so if we're here, we should execute the function in question.
2623          */
2624         return(tr_func(periph, tr_config->tr_arg));
2625 }
2626
2627 /*
2628  * Execute the given function for every bus in the EDT.
2629  */
2630 static int
2631 xpt_for_all_busses(xpt_busfunc_t *tr_func, void *arg)
2632 {
2633         struct xpt_traverse_config tr_config;
2634
2635         tr_config.depth = XPT_DEPTH_BUS;
2636         tr_config.tr_func = tr_func;
2637         tr_config.tr_arg = arg;
2638
2639         return(xptbustraverse(NULL, xptdefbusfunc, &tr_config));
2640 }
2641
2642 #ifdef notusedyet
2643 /*
2644  * Execute the given function for every target in the EDT.
2645  */
2646 static int
2647 xpt_for_all_targets(xpt_targetfunc_t *tr_func, void *arg)
2648 {
2649         struct xpt_traverse_config tr_config;
2650
2651         tr_config.depth = XPT_DEPTH_TARGET;
2652         tr_config.tr_func = tr_func;
2653         tr_config.tr_arg = arg;
2654
2655         return(xptbustraverse(NULL, xptdefbusfunc, &tr_config));
2656 }
2657 #endif /* notusedyet */
2658
2659 /*
2660  * Execute the given function for every device in the EDT.
2661  */
2662 static int
2663 xpt_for_all_devices(xpt_devicefunc_t *tr_func, void *arg)
2664 {
2665         struct xpt_traverse_config tr_config;
2666
2667         tr_config.depth = XPT_DEPTH_DEVICE;
2668         tr_config.tr_func = tr_func;
2669         tr_config.tr_arg = arg;
2670
2671         return(xptbustraverse(NULL, xptdefbusfunc, &tr_config));
2672 }
2673
2674 #ifdef notusedyet
2675 /*
2676  * Execute the given function for every peripheral in the EDT.
2677  */
2678 static int
2679 xpt_for_all_periphs(xpt_periphfunc_t *tr_func, void *arg)
2680 {
2681         struct xpt_traverse_config tr_config;
2682
2683         tr_config.depth = XPT_DEPTH_PERIPH;
2684         tr_config.tr_func = tr_func;
2685         tr_config.tr_arg = arg;
2686
2687         return(xptbustraverse(NULL, xptdefbusfunc, &tr_config));
2688 }
2689 #endif /* notusedyet */
2690
2691 static int
2692 xptsetasyncfunc(struct cam_ed *device, void *arg)
2693 {
2694         struct cam_path path;
2695         struct ccb_getdev cgd;
2696         struct async_node *cur_entry;
2697
2698         cur_entry = (struct async_node *)arg;
2699
2700         /*
2701          * Don't report unconfigured devices (Wildcard devs,
2702          * devices only for target mode, device instances
2703          * that have been invalidated but are waiting for
2704          * their last reference count to be released).
2705          */
2706         if ((device->flags & CAM_DEV_UNCONFIGURED) != 0)
2707                 return (1);
2708
2709         xpt_compile_path(&path,
2710                          NULL,
2711                          device->target->bus->path_id,
2712                          device->target->target_id,
2713                          device->lun_id);
2714         xpt_setup_ccb(&cgd.ccb_h, &path, /*priority*/1);
2715         cgd.ccb_h.func_code = XPT_GDEV_TYPE;
2716         xpt_action((union ccb *)&cgd);
2717         cur_entry->callback(cur_entry->callback_arg,
2718                             AC_FOUND_DEVICE,
2719                             &path, &cgd);
2720         xpt_release_path(&path);
2721
2722         return(1);
2723 }
2724
2725 static int
2726 xptsetasyncbusfunc(struct cam_eb *bus, void *arg)
2727 {
2728         struct cam_path path;
2729         struct ccb_pathinq cpi;
2730         struct async_node *cur_entry;
2731
2732         cur_entry = (struct async_node *)arg;
2733
2734         xpt_compile_path(&path, /*periph*/NULL,
2735                          bus->sim->path_id,
2736                          CAM_TARGET_WILDCARD,
2737                          CAM_LUN_WILDCARD);
2738         xpt_setup_ccb(&cpi.ccb_h, &path, /*priority*/1);
2739         cpi.ccb_h.func_code = XPT_PATH_INQ;
2740         xpt_action((union ccb *)&cpi);
2741         cur_entry->callback(cur_entry->callback_arg,
2742                             AC_PATH_REGISTERED,
2743                             &path, &cpi);
2744         xpt_release_path(&path);
2745
2746         return(1);
2747 }
2748
2749 void
2750 xpt_action(union ccb *start_ccb)
2751 {
2752         CAM_DEBUG(start_ccb->ccb_h.path, CAM_DEBUG_TRACE, ("xpt_action\n"));
2753
2754         start_ccb->ccb_h.status = CAM_REQ_INPROG;
2755
2756         crit_enter();
2757
2758         switch (start_ccb->ccb_h.func_code) {
2759         case XPT_SCSI_IO:
2760         {
2761 #ifdef CAMDEBUG
2762                 char cdb_str[(SCSI_MAX_CDBLEN * 3) + 1];
2763                 struct cam_path *path;
2764
2765                 path = start_ccb->ccb_h.path;
2766 #endif
2767
2768                 /*
2769                  * For the sake of compatibility with SCSI-1
2770                  * devices that may not understand the identify
2771                  * message, we include lun information in the
2772                  * second byte of all commands.  SCSI-1 specifies
2773                  * that luns are a 3 bit value and reserves only 3
2774                  * bits for lun information in the CDB.  Later
2775                  * revisions of the SCSI spec allow for more than 8
2776                  * luns, but have deprecated lun information in the
2777                  * CDB.  So, if the lun won't fit, we must omit.
2778                  *
2779                  * Also be aware that during initial probing for devices,
2780                  * the inquiry information is unknown but initialized to 0.
2781                  * This means that this code will be exercised while probing
2782                  * devices with an ANSI revision greater than 2.
2783                  */
2784                 if (SID_ANSI_REV(&start_ccb->ccb_h.path->device->inq_data) <= 2
2785                  && start_ccb->ccb_h.target_lun < 8
2786                  && (start_ccb->ccb_h.flags & CAM_CDB_POINTER) == 0) {
2787
2788                         start_ccb->csio.cdb_io.cdb_bytes[1] |=
2789                             start_ccb->ccb_h.target_lun << 5;
2790                 }
2791                 start_ccb->csio.scsi_status = SCSI_STATUS_OK;
2792                 CAM_DEBUG(path, CAM_DEBUG_CDB,("%s. CDB: %s\n",
2793                           scsi_op_desc(start_ccb->csio.cdb_io.cdb_bytes[0],
2794                                        &path->device->inq_data),
2795                           scsi_cdb_string(start_ccb->csio.cdb_io.cdb_bytes,
2796                                           cdb_str, sizeof(cdb_str))));
2797                 /* FALLTHROUGH */
2798         }
2799         case XPT_TARGET_IO:
2800         case XPT_CONT_TARGET_IO:
2801                 start_ccb->csio.sense_resid = 0;
2802                 start_ccb->csio.resid = 0;
2803                 /* FALLTHROUGH */
2804         case XPT_RESET_DEV:
2805         case XPT_ENG_EXEC:
2806         {
2807                 struct cam_path *path;
2808                 int runq;
2809
2810                 path = start_ccb->ccb_h.path;
2811
2812                 cam_ccbq_insert_ccb(&path->device->ccbq, start_ccb);
2813                 if (path->device->qfrozen_cnt == 0)
2814                         runq = xpt_schedule_dev_sendq(path->bus, path->device);
2815                 else
2816                         runq = 0;
2817                 if (runq != 0)
2818                         xpt_run_dev_sendq(path->bus);
2819                 break;
2820         }
2821         case XPT_SET_TRAN_SETTINGS:
2822         {
2823                 xpt_set_transfer_settings(&start_ccb->cts,
2824                                           start_ccb->ccb_h.path->device,
2825                                           /*async_update*/FALSE);
2826                 break;
2827         }
2828         case XPT_CALC_GEOMETRY:
2829         {
2830                 struct cam_sim *sim;
2831
2832                 /* Filter out garbage */
2833                 if (start_ccb->ccg.block_size == 0
2834                  || start_ccb->ccg.volume_size == 0) {
2835                         start_ccb->ccg.cylinders = 0;
2836                         start_ccb->ccg.heads = 0;
2837                         start_ccb->ccg.secs_per_track = 0;
2838                         start_ccb->ccb_h.status = CAM_REQ_CMP;
2839                         break;
2840                 }
2841                 sim = start_ccb->ccb_h.path->bus->sim;
2842                 (*(sim->sim_action))(sim, start_ccb);
2843                 break;
2844         }
2845         case XPT_ABORT:
2846         {
2847                 union ccb* abort_ccb;
2848
2849                 abort_ccb = start_ccb->cab.abort_ccb;
2850                 if (XPT_FC_IS_DEV_QUEUED(abort_ccb)) {
2851
2852                         if (abort_ccb->ccb_h.pinfo.index >= 0) {
2853                                 struct cam_ccbq *ccbq;
2854
2855                                 ccbq = &abort_ccb->ccb_h.path->device->ccbq;
2856                                 cam_ccbq_remove_ccb(ccbq, abort_ccb);
2857                                 abort_ccb->ccb_h.status =
2858                                     CAM_REQ_ABORTED|CAM_DEV_QFRZN;
2859                                 xpt_freeze_devq(abort_ccb->ccb_h.path, 1);
2860                                 xpt_done(abort_ccb);
2861                                 start_ccb->ccb_h.status = CAM_REQ_CMP;
2862                                 break;
2863                         }
2864                         if (abort_ccb->ccb_h.pinfo.index == CAM_UNQUEUED_INDEX
2865                          && (abort_ccb->ccb_h.status & CAM_SIM_QUEUED) == 0) {
2866                                 /*
2867                                  * We've caught this ccb en route to
2868                                  * the SIM.  Flag it for abort and the
2869                                  * SIM will do so just before starting
2870                                  * real work on the CCB.
2871                                  */
2872                                 abort_ccb->ccb_h.status =
2873                                     CAM_REQ_ABORTED|CAM_DEV_QFRZN;
2874                                 xpt_freeze_devq(abort_ccb->ccb_h.path, 1);
2875                                 start_ccb->ccb_h.status = CAM_REQ_CMP;
2876                                 break;
2877                         }
2878                 } 
2879                 if (XPT_FC_IS_QUEUED(abort_ccb)
2880                  && (abort_ccb->ccb_h.pinfo.index == CAM_DONEQ_INDEX)) {
2881                         /*
2882                          * It's already completed but waiting
2883                          * for our SWI to get to it.
2884                          */
2885                         start_ccb->ccb_h.status = CAM_UA_ABORT;
2886                         break;
2887                 }
2888                 /*
2889                  * If we weren't able to take care of the abort request
2890                  * in the XPT, pass the request down to the SIM for processing.
2891                  */
2892                 /* FALLTHROUGH */
2893         }
2894         case XPT_ACCEPT_TARGET_IO:
2895         case XPT_EN_LUN:
2896         case XPT_IMMED_NOTIFY:
2897         case XPT_NOTIFY_ACK:
2898         case XPT_GET_TRAN_SETTINGS:
2899         case XPT_RESET_BUS:
2900         {
2901                 struct cam_sim *sim;
2902
2903                 sim = start_ccb->ccb_h.path->bus->sim;
2904                 (*(sim->sim_action))(sim, start_ccb);
2905                 break;
2906         }
2907         case XPT_PATH_INQ:
2908         {
2909                 struct cam_sim *sim;
2910
2911                 sim = start_ccb->ccb_h.path->bus->sim;
2912                 (*(sim->sim_action))(sim, start_ccb);
2913                 break;
2914         }
2915         case XPT_PATH_STATS:
2916                 start_ccb->cpis.last_reset =
2917                         start_ccb->ccb_h.path->bus->last_reset;
2918                 start_ccb->ccb_h.status = CAM_REQ_CMP;
2919                 break;
2920         case XPT_GDEV_TYPE:
2921         {
2922                 struct cam_ed *dev;
2923
2924                 dev = start_ccb->ccb_h.path->device;
2925                 if ((dev->flags & CAM_DEV_UNCONFIGURED) != 0) {
2926                         start_ccb->ccb_h.status = CAM_DEV_NOT_THERE;
2927                 } else {
2928                         struct ccb_getdev *cgd;
2929                         struct cam_eb *bus;
2930                         struct cam_et *tar;
2931
2932                         cgd = &start_ccb->cgd;
2933                         bus = cgd->ccb_h.path->bus;
2934                         tar = cgd->ccb_h.path->target;
2935                         cgd->inq_data = dev->inq_data;
2936                         cgd->ccb_h.status = CAM_REQ_CMP;
2937                         cgd->serial_num_len = dev->serial_num_len;
2938                         if ((dev->serial_num_len > 0)
2939                          && (dev->serial_num != NULL))
2940                                 bcopy(dev->serial_num, cgd->serial_num,
2941                                       dev->serial_num_len);
2942                 }
2943                 break; 
2944         }
2945         case XPT_GDEV_STATS:
2946         {
2947                 struct cam_ed *dev;
2948
2949                 dev = start_ccb->ccb_h.path->device;
2950                 if ((dev->flags & CAM_DEV_UNCONFIGURED) != 0) {
2951                         start_ccb->ccb_h.status = CAM_DEV_NOT_THERE;
2952                 } else {
2953                         struct ccb_getdevstats *cgds;
2954                         struct cam_eb *bus;
2955                         struct cam_et *tar;
2956
2957                         cgds = &start_ccb->cgds;
2958                         bus = cgds->ccb_h.path->bus;
2959                         tar = cgds->ccb_h.path->target;
2960                         cgds->dev_openings = dev->ccbq.dev_openings;
2961                         cgds->dev_active = dev->ccbq.dev_active;
2962                         cgds->devq_openings = dev->ccbq.devq_openings;
2963                         cgds->devq_queued = dev->ccbq.queue.entries;
2964                         cgds->held = dev->ccbq.held;
2965                         cgds->last_reset = tar->last_reset;
2966                         cgds->maxtags = dev->quirk->maxtags;
2967                         cgds->mintags = dev->quirk->mintags;
2968                         if (timevalcmp(&tar->last_reset, &bus->last_reset, <))
2969                                 cgds->last_reset = bus->last_reset;
2970                         cgds->ccb_h.status = CAM_REQ_CMP;
2971                 }
2972                 break;
2973         }
2974         case XPT_GDEVLIST:
2975         {
2976                 struct cam_periph       *nperiph;
2977                 struct periph_list      *periph_head;
2978                 struct ccb_getdevlist   *cgdl;
2979                 int                     i;
2980                 struct cam_ed           *device;
2981                 int                     found;
2982
2983
2984                 found = 0;
2985
2986                 /*
2987                  * Don't want anyone mucking with our data.
2988                  */
2989                 device = start_ccb->ccb_h.path->device;
2990                 periph_head = &device->periphs;
2991                 cgdl = &start_ccb->cgdl;
2992
2993                 /*
2994                  * Check and see if the list has changed since the user
2995                  * last requested a list member.  If so, tell them that the
2996                  * list has changed, and therefore they need to start over 
2997                  * from the beginning.
2998                  */
2999                 if ((cgdl->index != 0) && 
3000                     (cgdl->generation != device->generation)) {
3001                         cgdl->status = CAM_GDEVLIST_LIST_CHANGED;
3002                         break;
3003                 }
3004
3005                 /*
3006                  * Traverse the list of peripherals and attempt to find 
3007                  * the requested peripheral.
3008                  */
3009                 for (nperiph = periph_head->slh_first, i = 0;
3010                      (nperiph != NULL) && (i <= cgdl->index);
3011                      nperiph = nperiph->periph_links.sle_next, i++) {
3012                         if (i == cgdl->index) {
3013                                 strncpy(cgdl->periph_name,
3014                                         nperiph->periph_name,
3015                                         DEV_IDLEN);
3016                                 cgdl->unit_number = nperiph->unit_number;
3017                                 found = 1;
3018                         }
3019                 }
3020                 if (found == 0) {
3021                         cgdl->status = CAM_GDEVLIST_ERROR;
3022                         break;
3023                 }
3024
3025                 if (nperiph == NULL)
3026                         cgdl->status = CAM_GDEVLIST_LAST_DEVICE;
3027                 else
3028                         cgdl->status = CAM_GDEVLIST_MORE_DEVS;
3029
3030                 cgdl->index++;
3031                 cgdl->generation = device->generation;
3032
3033                 cgdl->ccb_h.status = CAM_REQ_CMP;
3034                 break;
3035         }
3036         case XPT_DEV_MATCH:
3037         {
3038                 dev_pos_type position_type;
3039                 struct ccb_dev_match *cdm;
3040                 int ret;
3041
3042                 cdm = &start_ccb->cdm;
3043
3044                 /*
3045                  * Prevent EDT changes while we traverse it.
3046                  */
3047                 /*
3048                  * There are two ways of getting at information in the EDT.
3049                  * The first way is via the primary EDT tree.  It starts
3050                  * with a list of busses, then a list of targets on a bus,
3051                  * then devices/luns on a target, and then peripherals on a
3052                  * device/lun.  The "other" way is by the peripheral driver
3053                  * lists.  The peripheral driver lists are organized by
3054                  * peripheral driver.  (obviously)  So it makes sense to
3055                  * use the peripheral driver list if the user is looking
3056                  * for something like "da1", or all "da" devices.  If the
3057                  * user is looking for something on a particular bus/target
3058                  * or lun, it's generally better to go through the EDT tree.
3059                  */
3060
3061                 if (cdm->pos.position_type != CAM_DEV_POS_NONE)
3062                         position_type = cdm->pos.position_type;
3063                 else {
3064                         int i;
3065
3066                         position_type = CAM_DEV_POS_NONE;
3067
3068                         for (i = 0; i < cdm->num_patterns; i++) {
3069                                 if ((cdm->patterns[i].type == DEV_MATCH_BUS)
3070                                  ||(cdm->patterns[i].type == DEV_MATCH_DEVICE)){
3071                                         position_type = CAM_DEV_POS_EDT;
3072                                         break;
3073                                 }
3074                         }
3075
3076                         if (cdm->num_patterns == 0)
3077                                 position_type = CAM_DEV_POS_EDT;
3078                         else if (position_type == CAM_DEV_POS_NONE)
3079                                 position_type = CAM_DEV_POS_PDRV;
3080                 }
3081
3082                 switch(position_type & CAM_DEV_POS_TYPEMASK) {
3083                 case CAM_DEV_POS_EDT:
3084                         ret = xptedtmatch(cdm);
3085                         break;
3086                 case CAM_DEV_POS_PDRV:
3087                         ret = xptperiphlistmatch(cdm);
3088                         break;
3089                 default:
3090                         cdm->status = CAM_DEV_MATCH_ERROR;
3091                         break;
3092                 }
3093
3094                 if (cdm->status == CAM_DEV_MATCH_ERROR)
3095                         start_ccb->ccb_h.status = CAM_REQ_CMP_ERR;
3096                 else
3097                         start_ccb->ccb_h.status = CAM_REQ_CMP;
3098
3099                 break;
3100         }
3101         case XPT_SASYNC_CB:
3102         {
3103                 struct ccb_setasync *csa;
3104                 struct async_node *cur_entry;
3105                 struct async_list *async_head;
3106                 u_int32_t added;
3107
3108                 csa = &start_ccb->csa;
3109                 added = csa->event_enable;
3110                 async_head = &csa->ccb_h.path->device->asyncs;
3111
3112                 /*
3113                  * If there is already an entry for us, simply
3114                  * update it.
3115                  */
3116                 cur_entry = SLIST_FIRST(async_head);
3117                 while (cur_entry != NULL) {
3118                         if ((cur_entry->callback_arg == csa->callback_arg)
3119                          && (cur_entry->callback == csa->callback))
3120                                 break;
3121                         cur_entry = SLIST_NEXT(cur_entry, links);
3122                 }
3123
3124                 if (cur_entry != NULL) {
3125                         /*
3126                          * If the request has no flags set,
3127                          * remove the entry.
3128                          */
3129                         added &= ~cur_entry->event_enable;
3130                         if (csa->event_enable == 0) {
3131                                 SLIST_REMOVE(async_head, cur_entry,
3132                                              async_node, links);
3133                                 csa->ccb_h.path->device->refcount--;
3134                                 free(cur_entry, M_DEVBUF);
3135                         } else {
3136                                 cur_entry->event_enable = csa->event_enable;
3137                         }
3138                 } else {
3139                         cur_entry = malloc(sizeof(*cur_entry), 
3140                                             M_DEVBUF, M_INTWAIT);
3141                         cur_entry->event_enable = csa->event_enable;
3142                         cur_entry->callback_arg = csa->callback_arg;
3143                         cur_entry->callback = csa->callback;
3144                         SLIST_INSERT_HEAD(async_head, cur_entry, links);
3145                         csa->ccb_h.path->device->refcount++;
3146                 }
3147
3148                 if ((added & AC_FOUND_DEVICE) != 0) {
3149                         /*
3150                          * Get this peripheral up to date with all
3151                          * the currently existing devices.
3152                          */
3153                         xpt_for_all_devices(xptsetasyncfunc, cur_entry);
3154                 }
3155                 if ((added & AC_PATH_REGISTERED) != 0) {
3156                         /*
3157                          * Get this peripheral up to date with all
3158                          * the currently existing busses.
3159                          */
3160                         xpt_for_all_busses(xptsetasyncbusfunc, cur_entry);
3161                 }
3162                 start_ccb->ccb_h.status = CAM_REQ_CMP;
3163                 break;
3164         }
3165         case XPT_REL_SIMQ:
3166         {
3167                 struct ccb_relsim *crs;
3168                 struct cam_ed *dev;
3169
3170                 crs = &start_ccb->crs;
3171                 dev = crs->ccb_h.path->device;
3172                 if (dev == NULL) {
3173
3174                         crs->ccb_h.status = CAM_DEV_NOT_THERE;
3175                         break;
3176                 }
3177
3178                 if ((crs->release_flags & RELSIM_ADJUST_OPENINGS) != 0) {
3179
3180                         if ((dev->inq_data.flags & SID_CmdQue) != 0) {
3181
3182                                 /* Don't ever go below one opening */
3183                                 if (crs->openings > 0) {
3184                                         xpt_dev_ccbq_resize(crs->ccb_h.path,
3185                                                             crs->openings);
3186
3187                                         if (bootverbose) {
3188                                                 xpt_print_path(crs->ccb_h.path);
3189                                                 printf("tagged openings "
3190                                                        "now %d\n",
3191                                                        crs->openings);
3192                                         }
3193                                 }
3194                         }
3195                 }
3196
3197                 if ((crs->release_flags & RELSIM_RELEASE_AFTER_TIMEOUT) != 0) {
3198
3199                         if ((dev->flags & CAM_DEV_REL_TIMEOUT_PENDING) != 0) {
3200
3201                                 /*
3202                                  * Just extend the old timeout and decrement
3203                                  * the freeze count so that a single timeout
3204                                  * is sufficient for releasing the queue.
3205                                  */
3206                                 start_ccb->ccb_h.flags &= ~CAM_DEV_QFREEZE;
3207                                 callout_stop(&dev->c_handle);
3208                         } else {
3209
3210                                 start_ccb->ccb_h.flags |= CAM_DEV_QFREEZE;
3211                         }
3212
3213                         callout_reset(&dev->c_handle,
3214                                       (crs->release_timeout * hz) / 1000, 
3215                                       xpt_release_devq_timeout, dev);
3216
3217                         dev->flags |= CAM_DEV_REL_TIMEOUT_PENDING;
3218
3219                 }
3220
3221                 if ((crs->release_flags & RELSIM_RELEASE_AFTER_CMDCMPLT) != 0) {
3222
3223                         if ((dev->flags & CAM_DEV_REL_ON_COMPLETE) != 0) {
3224                                 /*
3225                                  * Decrement the freeze count so that a single
3226                                  * completion is still sufficient to unfreeze
3227                                  * the queue.
3228                                  */
3229                                 start_ccb->ccb_h.flags &= ~CAM_DEV_QFREEZE;
3230                         } else {
3231                                 
3232                                 dev->flags |= CAM_DEV_REL_ON_COMPLETE;
3233                                 start_ccb->ccb_h.flags |= CAM_DEV_QFREEZE;
3234                         }
3235                 }
3236
3237                 if ((crs->release_flags & RELSIM_RELEASE_AFTER_QEMPTY) != 0) {
3238
3239                         if ((dev->flags & CAM_DEV_REL_ON_QUEUE_EMPTY) != 0
3240                          || (dev->ccbq.dev_active == 0)) {
3241
3242                                 start_ccb->ccb_h.flags &= ~CAM_DEV_QFREEZE;
3243                         } else {
3244                                 
3245                                 dev->flags |= CAM_DEV_REL_ON_QUEUE_EMPTY;
3246                                 start_ccb->ccb_h.flags |= CAM_DEV_QFREEZE;
3247                         }
3248                 }
3249                 
3250                 if ((start_ccb->ccb_h.flags & CAM_DEV_QFREEZE) == 0) {
3251
3252                         xpt_release_devq(crs->ccb_h.path, /*count*/1,
3253                                          /*run_queue*/TRUE);
3254                 }
3255                 start_ccb->crs.qfrozen_cnt = dev->qfrozen_cnt;
3256                 start_ccb->ccb_h.status = CAM_REQ_CMP;
3257                 break;
3258         }
3259         case XPT_SCAN_BUS:
3260                 xpt_scan_bus(start_ccb->ccb_h.path->periph, start_ccb);
3261                 break;
3262         case XPT_SCAN_LUN:
3263                 xpt_scan_lun(start_ccb->ccb_h.path->periph,
3264                              start_ccb->ccb_h.path, start_ccb->crcn.flags,
3265                              start_ccb);
3266                 break;
3267         case XPT_DEBUG: {
3268 #ifdef CAMDEBUG
3269 #ifdef CAM_DEBUG_DELAY
3270                 cam_debug_delay = CAM_DEBUG_DELAY;
3271 #endif
3272                 cam_dflags = start_ccb->cdbg.flags;
3273                 if (cam_dpath != NULL) {
3274                         xpt_free_path(cam_dpath);
3275                         cam_dpath = NULL;
3276                 }
3277
3278                 if (cam_dflags != CAM_DEBUG_NONE) {
3279                         if (xpt_create_path(&cam_dpath, xpt_periph,
3280                                             start_ccb->ccb_h.path_id,
3281                                             start_ccb->ccb_h.target_id,
3282                                             start_ccb->ccb_h.target_lun) !=
3283                                             CAM_REQ_CMP) {
3284                                 start_ccb->ccb_h.status = CAM_RESRC_UNAVAIL;
3285                                 cam_dflags = CAM_DEBUG_NONE;
3286                         } else {
3287                                 start_ccb->ccb_h.status = CAM_REQ_CMP;
3288                                 xpt_print_path(cam_dpath);
3289                                 printf("debugging flags now %x\n", cam_dflags);
3290                         }
3291                 } else {
3292                         cam_dpath = NULL;
3293                         start_ccb->ccb_h.status = CAM_REQ_CMP;
3294                 }
3295 #else /* !CAMDEBUG */
3296                 start_ccb->ccb_h.status = CAM_FUNC_NOTAVAIL;
3297 #endif /* CAMDEBUG */
3298                 break;
3299         }
3300         case XPT_NOOP:
3301                 if ((start_ccb->ccb_h.flags & CAM_DEV_QFREEZE) != 0)
3302                         xpt_freeze_devq(start_ccb->ccb_h.path, 1);
3303                 start_ccb->ccb_h.status = CAM_REQ_CMP;
3304                 break;
3305         default:
3306         case XPT_SDEV_TYPE:
3307         case XPT_TERM_IO:
3308         case XPT_ENG_INQ:
3309                 /* XXX Implement */
3310                 start_ccb->ccb_h.status = CAM_PROVIDE_FAIL;
3311                 break;
3312         }
3313         crit_exit();
3314 }
3315
3316 void
3317 xpt_polled_action(union ccb *start_ccb)
3318 {
3319         u_int32_t timeout;
3320         struct    cam_sim *sim; 
3321         struct    cam_devq *devq;
3322         struct    cam_ed *dev;
3323
3324         timeout = start_ccb->ccb_h.timeout;
3325         sim = start_ccb->ccb_h.path->bus->sim;
3326         devq = sim->devq;
3327         dev = start_ccb->ccb_h.path->device;
3328
3329         crit_enter();
3330
3331         /*
3332          * Steal an opening so that no other queued requests
3333          * can get it before us while we simulate interrupts.
3334          */
3335         dev->ccbq.devq_openings--;
3336         dev->ccbq.dev_openings--;       
3337         
3338         while(((devq && devq->send_openings <= 0) || dev->ccbq.dev_openings < 0)
3339            && (--timeout > 0)) {
3340                 DELAY(1000);
3341                 (*(sim->sim_poll))(sim);
3342                 swi_camnet(NULL, NULL);
3343                 swi_cambio(NULL, NULL);         
3344         }
3345         
3346         dev->ccbq.devq_openings++;
3347         dev->ccbq.dev_openings++;
3348         
3349         if (timeout != 0) {
3350                 xpt_action(start_ccb);
3351                 while(--timeout > 0) {
3352                         (*(sim->sim_poll))(sim);
3353                         swi_camnet(NULL, NULL);
3354                         swi_cambio(NULL, NULL);
3355                         if ((start_ccb->ccb_h.status  & CAM_STATUS_MASK)
3356                             != CAM_REQ_INPROG)
3357                                 break;
3358                         DELAY(1000);
3359                 }
3360                 if (timeout == 0) {
3361                         /*
3362                          * XXX Is it worth adding a sim_timeout entry
3363                          * point so we can attempt recovery?  If
3364                          * this is only used for dumps, I don't think
3365                          * it is.
3366                          */
3367                         start_ccb->ccb_h.status = CAM_CMD_TIMEOUT;
3368                 }
3369         } else {
3370                 start_ccb->ccb_h.status = CAM_RESRC_UNAVAIL;
3371         }
3372         crit_exit();
3373 }
3374         
3375 /*
3376  * Schedule a peripheral driver to receive a ccb when it's
3377  * target device has space for more transactions.
3378  */
3379 void
3380 xpt_schedule(struct cam_periph *perph, u_int32_t new_priority)
3381 {
3382         struct cam_ed *device;
3383         int runq;
3384
3385         CAM_DEBUG(perph->path, CAM_DEBUG_TRACE, ("xpt_schedule\n"));
3386         device = perph->path->device;
3387         crit_enter();
3388         if (periph_is_queued(perph)) {
3389                 /* Simply reorder based on new priority */
3390                 CAM_DEBUG(perph->path, CAM_DEBUG_SUBTRACE,
3391                           ("   change priority to %d\n", new_priority));
3392                 if (new_priority < perph->pinfo.priority) {
3393                         camq_change_priority(&device->drvq,
3394                                              perph->pinfo.index,
3395                                              new_priority);
3396                 }
3397                 runq = 0;
3398         } else {
3399                 /* New entry on the queue */
3400                 CAM_DEBUG(perph->path, CAM_DEBUG_SUBTRACE,
3401                           ("   added periph to queue\n"));
3402                 perph->pinfo.priority = new_priority;
3403                 perph->pinfo.generation = ++device->drvq.generation;
3404                 camq_insert(&device->drvq, &perph->pinfo);
3405                 runq = xpt_schedule_dev_allocq(perph->path->bus, device);
3406         }
3407         crit_exit();
3408         if (runq != 0) {
3409                 CAM_DEBUG(perph->path, CAM_DEBUG_SUBTRACE,
3410                           ("   calling xpt_run_devq\n"));
3411                 xpt_run_dev_allocq(perph->path->bus);
3412         }
3413 }
3414
3415
3416 /*
3417  * Schedule a device to run on a given queue.
3418  * If the device was inserted as a new entry on the queue,
3419  * return 1 meaning the device queue should be run. If we
3420  * were already queued, implying someone else has already
3421  * started the queue, return 0 so the caller doesn't attempt
3422  * to run the queue.  Must be run in a critical section.
3423  */
3424 static int
3425 xpt_schedule_dev(struct camq *queue, cam_pinfo *pinfo,
3426                  u_int32_t new_priority)
3427 {
3428         int retval;
3429         u_int32_t old_priority;
3430
3431         CAM_DEBUG_PRINT(CAM_DEBUG_XPT, ("xpt_schedule_dev\n"));
3432
3433         old_priority = pinfo->priority;
3434
3435         /*
3436          * Are we already queued?
3437          */
3438         if (pinfo->index != CAM_UNQUEUED_INDEX) {
3439                 /* Simply reorder based on new priority */
3440                 if (new_priority < old_priority) {
3441                         camq_change_priority(queue, pinfo->index,
3442                                              new_priority);
3443                         CAM_DEBUG_PRINT(CAM_DEBUG_XPT,
3444                                         ("changed priority to %d\n",
3445                                          new_priority));
3446                 }
3447                 retval = 0;
3448         } else {
3449                 /* New entry on the queue */
3450                 if (new_priority < old_priority)
3451                         pinfo->priority = new_priority;
3452
3453                 CAM_DEBUG_PRINT(CAM_DEBUG_XPT,
3454                                 ("Inserting onto queue\n"));
3455                 pinfo->generation = ++queue->generation;
3456                 camq_insert(queue, pinfo);
3457                 retval = 1;
3458         }
3459         return (retval);
3460 }
3461
3462 static void
3463 xpt_run_dev_allocq(struct cam_eb *bus)
3464 {
3465         struct  cam_devq *devq;
3466
3467         if ((devq = bus->sim->devq) == NULL) {
3468                 CAM_DEBUG_PRINT(CAM_DEBUG_XPT, ("xpt_run_dev_allocq: NULL devq\n"));
3469                 return;
3470         }
3471         CAM_DEBUG_PRINT(CAM_DEBUG_XPT, ("xpt_run_dev_allocq\n"));
3472
3473         CAM_DEBUG_PRINT(CAM_DEBUG_XPT,
3474                         ("   qfrozen_cnt == 0x%x, entries == %d, "
3475                          "openings == %d, active == %d\n",
3476                          devq->alloc_queue.qfrozen_cnt,
3477                          devq->alloc_queue.entries,
3478                          devq->alloc_openings,
3479                          devq->alloc_active));
3480
3481         crit_enter();
3482         devq->alloc_queue.qfrozen_cnt++;
3483         while ((devq->alloc_queue.entries > 0)
3484             && (devq->alloc_openings > 0)
3485             && (devq->alloc_queue.qfrozen_cnt <= 1)) {
3486                 struct  cam_ed_qinfo *qinfo;
3487                 struct  cam_ed *device;
3488                 union   ccb *work_ccb;
3489                 struct  cam_periph *drv;
3490                 struct  camq *drvq;
3491                 
3492                 qinfo = (struct cam_ed_qinfo *)camq_remove(&devq->alloc_queue,
3493                                                            CAMQ_HEAD);
3494                 device = qinfo->device;
3495
3496                 CAM_DEBUG_PRINT(CAM_DEBUG_XPT,
3497                                 ("running device %p\n", device));
3498
3499                 drvq = &device->drvq;
3500
3501 #ifdef CAMDEBUG
3502                 if (drvq->entries <= 0) {
3503                         panic("xpt_run_dev_allocq: "
3504                               "Device on queue without any work to do");
3505                 }
3506 #endif
3507                 if ((work_ccb = xpt_get_ccb(device)) != NULL) {
3508                         devq->alloc_openings--;
3509                         devq->alloc_active++;
3510                         drv = (struct cam_periph*)camq_remove(drvq, CAMQ_HEAD);
3511                         crit_exit();
3512                         xpt_setup_ccb(&work_ccb->ccb_h, drv->path,
3513                                       drv->pinfo.priority);
3514                         CAM_DEBUG_PRINT(CAM_DEBUG_XPT,
3515                                         ("calling periph start\n"));
3516                         drv->periph_start(drv, work_ccb);
3517                 } else {
3518                         /*
3519                          * Malloc failure in alloc_ccb
3520                          */
3521                         /*
3522                          * XXX add us to a list to be run from free_ccb
3523                          * if we don't have any ccbs active on this
3524                          * device queue otherwise we may never get run
3525                          * again.
3526                          */
3527                         break;
3528                 }
3529         
3530                 /* Raise IPL for possible insertion and test at top of loop */
3531                 crit_enter();
3532
3533                 if (drvq->entries > 0) {
3534                         /* We have more work.  Attempt to reschedule */
3535                         xpt_schedule_dev_allocq(bus, device);
3536                 }
3537         }
3538         devq->alloc_queue.qfrozen_cnt--;
3539         crit_exit();
3540 }
3541
3542 static void
3543 xpt_run_dev_sendq(struct cam_eb *bus)
3544 {
3545         struct  cam_devq *devq;
3546
3547         if ((devq = bus->sim->devq) == NULL) {
3548                 CAM_DEBUG_PRINT(CAM_DEBUG_XPT, ("xpt_run_dev_sendq: NULL devq\n"));
3549                 return;
3550         }
3551         CAM_DEBUG_PRINT(CAM_DEBUG_XPT, ("xpt_run_dev_sendq\n"));
3552
3553         crit_enter();
3554         devq->send_queue.qfrozen_cnt++;
3555         while ((devq->send_queue.entries > 0)
3556             && (devq->send_openings > 0)) {
3557                 struct  cam_ed_qinfo *qinfo;
3558                 struct  cam_ed *device;
3559                 union ccb *work_ccb;
3560                 struct  cam_sim *sim;
3561
3562                 if (devq->send_queue.qfrozen_cnt > 1) {
3563                         break;
3564                 }
3565
3566                 qinfo = (struct cam_ed_qinfo *)camq_remove(&devq->send_queue,
3567                                                            CAMQ_HEAD);
3568                 device = qinfo->device;
3569
3570                 /*
3571                  * If the device has been "frozen", don't attempt
3572                  * to run it.
3573                  */
3574                 if (device->qfrozen_cnt > 0) {
3575                         continue;
3576                 }
3577
3578                 CAM_DEBUG_PRINT(CAM_DEBUG_XPT,
3579                                 ("running device %p\n", device));
3580
3581                 work_ccb = cam_ccbq_peek_ccb(&device->ccbq, CAMQ_HEAD);
3582                 if (work_ccb == NULL) {
3583                         printf("device on run queue with no ccbs???\n");
3584                         continue;
3585                 }
3586
3587                 if ((work_ccb->ccb_h.flags & CAM_HIGH_POWER) != 0) {
3588
3589                         if (num_highpower <= 0) {
3590                                 /*
3591                                  * We got a high power command, but we
3592                                  * don't have any available slots.  Freeze
3593                                  * the device queue until we have a slot
3594                                  * available.
3595                                  */
3596                                 device->qfrozen_cnt++;
3597                                 STAILQ_INSERT_TAIL(&highpowerq, 
3598                                                    &work_ccb->ccb_h, 
3599                                                    xpt_links.stqe);
3600
3601                                 continue;
3602                         } else {
3603                                 /*
3604                                  * Consume a high power slot while
3605                                  * this ccb runs.
3606                                  */
3607                                 num_highpower--;
3608                         }
3609                 }
3610                 devq->active_dev = device;
3611                 cam_ccbq_remove_ccb(&device->ccbq, work_ccb);
3612
3613                 cam_ccbq_send_ccb(&device->ccbq, work_ccb);
3614
3615                 devq->send_openings--;
3616                 devq->send_active++;            
3617                 
3618                 if (device->ccbq.queue.entries > 0)
3619                         xpt_schedule_dev_sendq(bus, device);
3620
3621                 if (work_ccb && (work_ccb->ccb_h.flags & CAM_DEV_QFREEZE) != 0){
3622                         /*
3623                          * The client wants to freeze the queue
3624                          * after this CCB is sent.
3625                          */
3626                         device->qfrozen_cnt++;
3627                 }
3628
3629                 /* In Target mode, the peripheral driver knows best... */
3630                 if (work_ccb->ccb_h.func_code == XPT_SCSI_IO) {
3631                         if ((device->inq_flags & SID_CmdQue) != 0
3632                          && work_ccb->csio.tag_action != CAM_TAG_ACTION_NONE)
3633                                 work_ccb->ccb_h.flags |= CAM_TAG_ACTION_VALID;
3634                         else
3635                                 /*
3636                                  * Clear this in case of a retried CCB that
3637                                  * failed due to a rejected tag.
3638                                  */
3639                                 work_ccb->ccb_h.flags &= ~CAM_TAG_ACTION_VALID;
3640                 }
3641
3642                 /*
3643                  * Device queues can be shared among multiple sim instances
3644                  * that reside on different busses.  Use the SIM in the queue
3645                  * CCB's path, rather than the one in the bus that was passed
3646                  * into this function.
3647                  */
3648                 sim = work_ccb->ccb_h.path->bus->sim;
3649                 (*(sim->sim_action))(sim, work_ccb);
3650
3651                 devq->active_dev = NULL;
3652                 /* Raise IPL for possible insertion and test at top of loop */
3653         }
3654         devq->send_queue.qfrozen_cnt--;
3655         crit_exit();
3656 }
3657
3658 /*
3659  * This function merges stuff from the slave ccb into the master ccb, while
3660  * keeping important fields in the master ccb constant.
3661  */
3662 void
3663 xpt_merge_ccb(union ccb *master_ccb, union ccb *slave_ccb)
3664 {
3665         /*
3666          * Pull fields that are valid for peripheral drivers to set
3667          * into the master CCB along with the CCB "payload".
3668          */
3669         master_ccb->ccb_h.retry_count = slave_ccb->ccb_h.retry_count;
3670         master_ccb->ccb_h.func_code = slave_ccb->ccb_h.func_code;
3671         master_ccb->ccb_h.timeout = slave_ccb->ccb_h.timeout;
3672         master_ccb->ccb_h.flags = slave_ccb->ccb_h.flags;
3673         bcopy(&(&slave_ccb->ccb_h)[1], &(&master_ccb->ccb_h)[1],
3674               sizeof(union ccb) - sizeof(struct ccb_hdr));
3675 }
3676
3677 void
3678 xpt_setup_ccb(struct ccb_hdr *ccb_h, struct cam_path *path, u_int32_t priority)
3679 {
3680         CAM_DEBUG(path, CAM_DEBUG_TRACE, ("xpt_setup_ccb\n"));
3681         callout_init(&ccb_h->timeout_ch);
3682         ccb_h->pinfo.priority = priority;
3683         ccb_h->path = path;
3684         ccb_h->path_id = path->bus->path_id;
3685         if (path->target)
3686                 ccb_h->target_id = path->target->target_id;
3687         else
3688                 ccb_h->target_id = CAM_TARGET_WILDCARD;
3689         if (path->device) {
3690                 ccb_h->target_lun = path->device->lun_id;
3691                 ccb_h->pinfo.generation = ++path->device->ccbq.queue.generation;
3692         } else {
3693                 ccb_h->target_lun = CAM_TARGET_WILDCARD;
3694         }
3695         ccb_h->pinfo.index = CAM_UNQUEUED_INDEX;
3696         ccb_h->flags = 0;
3697 }
3698
3699 /* Path manipulation functions */
3700 cam_status
3701 xpt_create_path(struct cam_path **new_path_ptr, struct cam_periph *perph,
3702                 path_id_t path_id, target_id_t target_id, lun_id_t lun_id)
3703 {
3704         struct     cam_path *path;
3705         cam_status status;
3706
3707         path = malloc(sizeof(*path), M_DEVBUF, M_INTWAIT);
3708         status = xpt_compile_path(path, perph, path_id, target_id, lun_id);
3709         if (status != CAM_REQ_CMP) {
3710                 free(path, M_DEVBUF);
3711                 path = NULL;
3712         }
3713         *new_path_ptr = path;
3714         return (status);
3715 }
3716
3717 static cam_status
3718 xpt_compile_path(struct cam_path *new_path, struct cam_periph *perph,
3719                  path_id_t path_id, target_id_t target_id, lun_id_t lun_id)
3720 {
3721         struct       cam_eb *bus;
3722         struct       cam_et *target;
3723         struct       cam_ed *device;
3724         cam_status   status;
3725
3726         status = CAM_REQ_CMP;   /* Completed without error */
3727         target = NULL;          /* Wildcarded */
3728         device = NULL;          /* Wildcarded */
3729
3730         /*
3731          * We will potentially modify the EDT, so block interrupts
3732          * that may attempt to create cam paths.
3733          */
3734         crit_enter();
3735         bus = xpt_find_bus(path_id);
3736         if (bus == NULL) {
3737                 status = CAM_PATH_INVALID;
3738         } else {
3739                 target = xpt_find_target(bus, target_id);
3740                 if (target == NULL) {
3741                         /* Create one */
3742                         struct cam_et *new_target;
3743
3744                         new_target = xpt_alloc_target(bus, target_id);
3745                         if (new_target == NULL) {
3746                                 status = CAM_RESRC_UNAVAIL;
3747                         } else {
3748                                 target = new_target;
3749                         }
3750                 }
3751                 if (target != NULL) {
3752                         device = xpt_find_device(target, lun_id);
3753                         if (device == NULL) {
3754                                 /* Create one */
3755                                 struct cam_ed *new_device;
3756
3757                                 new_device = xpt_alloc_device(bus,
3758                                                               target,
3759                                                               lun_id);
3760                                 if (new_device == NULL) {
3761                                         status = CAM_RESRC_UNAVAIL;
3762                                 } else {
3763                                         device = new_device;
3764                                 }
3765                         }
3766                 }
3767         }
3768         crit_exit();
3769
3770         /*
3771          * Only touch the user's data if we are successful.
3772          */
3773         if (status == CAM_REQ_CMP) {
3774                 new_path->periph = perph;
3775                 new_path->bus = bus;
3776                 new_path->target = target;
3777                 new_path->device = device;
3778                 CAM_DEBUG(new_path, CAM_DEBUG_TRACE, ("xpt_compile_path\n"));
3779         } else {
3780                 if (device != NULL)
3781                         xpt_release_device(bus, target, device);
3782                 if (target != NULL)
3783                         xpt_release_target(bus, target);
3784                 if (bus != NULL)
3785                         xpt_release_bus(bus);
3786         }
3787         return (status);
3788 }
3789
3790 static void
3791 xpt_release_path(struct cam_path *path)
3792 {
3793         CAM_DEBUG(path, CAM_DEBUG_TRACE, ("xpt_release_path\n"));