Remove all remaining SPL code. Replace the mtd_cpl field in the machine
[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 1.25 2005/06/16 21:12:23 dillon Exp $
31  */
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/types.h>
35 #include <sys/malloc.h>
36 #include <sys/kernel.h>
37 #include <sys/time.h>
38 #include <sys/conf.h>
39 #include <sys/fcntl.h>
40 #include <sys/md5.h>
41 #include <sys/devicestat.h>
42 #include <sys/interrupt.h>
43 #include <sys/bus.h>
44 #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 (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 (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()
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()
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(dummy)
1305         void *dummy;
1306 {
1307         struct cam_sim *xpt_sim;
1308         struct cam_path *path;
1309         struct cam_devq *devq;
1310         cam_status status;
1311
1312         TAILQ_INIT(&xpt_busses);
1313         TAILQ_INIT(&cam_bioq);
1314         TAILQ_INIT(&cam_netq);
1315         SLIST_INIT(&ccb_freeq);
1316         STAILQ_INIT(&highpowerq);
1317
1318         /*
1319          * The xpt layer is, itself, the equivelent of a SIM.
1320          * Allow 16 ccbs in the ccb pool for it.  This should
1321          * give decent parallelism when we probe busses and
1322          * perform other XPT functions.
1323          */
1324         devq = cam_simq_alloc(16);
1325         xpt_sim = cam_sim_alloc(xptaction,
1326                                 xptpoll,
1327                                 "xpt",
1328                                 /*softc*/NULL,
1329                                 /*unit*/0,
1330                                 /*max_dev_transactions*/0,
1331                                 /*max_tagged_dev_transactions*/0,
1332                                 devq);
1333         cam_simq_release(devq);
1334         xpt_max_ccbs = 16;
1335                                 
1336         xpt_bus_register(xpt_sim, /*bus #*/0);
1337
1338         /*
1339          * Looking at the XPT from the SIM layer, the XPT is
1340          * the equivelent of a peripheral driver.  Allocate
1341          * a peripheral driver entry for us.
1342          */
1343         if ((status = xpt_create_path(&path, NULL, CAM_XPT_PATH_ID,
1344                                       CAM_TARGET_WILDCARD,
1345                                       CAM_LUN_WILDCARD)) != CAM_REQ_CMP) {
1346                 printf("xpt_init: xpt_create_path failed with status %#x,"
1347                        " failing attach\n", status);
1348                 return;
1349         }
1350
1351         cam_periph_alloc(xptregister, NULL, NULL, NULL, "xpt", CAM_PERIPH_BIO,
1352                          path, NULL, 0, NULL);
1353         xpt_free_path(path);
1354
1355         xpt_sim->softc = xpt_periph;
1356
1357         /*
1358          * Register a callback for when interrupts are enabled.
1359          */
1360         xpt_config_hook = malloc(sizeof(struct intr_config_hook),
1361                                   M_TEMP, M_INTWAIT | M_ZERO);
1362         xpt_config_hook->ich_func = xpt_config;
1363         xpt_config_hook->ich_desc = "xpt";
1364         if (config_intrhook_establish(xpt_config_hook) != 0) {
1365                 free (xpt_config_hook, M_TEMP);
1366                 printf("xpt_init: config_intrhook_establish failed "
1367                        "- failing attach\n");
1368         }
1369
1370         /* Install our software interrupt handlers */
1371         register_swi(SWI_CAMNET, swi_camnet, NULL, "swi_camnet");
1372         register_swi(SWI_CAMBIO, swi_cambio, NULL, "swi_cambio");
1373 }
1374
1375 static cam_status
1376 xptregister(struct cam_periph *periph, void *arg)
1377 {
1378         if (periph == NULL) {
1379                 printf("xptregister: periph was NULL!!\n");
1380                 return(CAM_REQ_CMP_ERR);
1381         }
1382
1383         periph->softc = NULL;
1384
1385         xpt_periph = periph;
1386
1387         return(CAM_REQ_CMP);
1388 }
1389
1390 int32_t
1391 xpt_add_periph(struct cam_periph *periph)
1392 {
1393         struct cam_ed *device;
1394         int32_t  status;
1395         struct periph_list *periph_head;
1396
1397         device = periph->path->device;
1398
1399         periph_head = &device->periphs;
1400
1401         status = CAM_REQ_CMP;
1402
1403         if (device != NULL) {
1404                 /*
1405                  * Make room for this peripheral
1406                  * so it will fit in the queue
1407                  * when it's scheduled to run
1408                  */
1409                 crit_enter();
1410                 status = camq_resize(&device->drvq,
1411                                      device->drvq.array_size + 1);
1412
1413                 device->generation++;
1414
1415                 SLIST_INSERT_HEAD(periph_head, periph, periph_links);
1416                 crit_exit();
1417         }
1418
1419         xsoftc.generation++;
1420
1421         return (status);
1422 }
1423
1424 void
1425 xpt_remove_periph(struct cam_periph *periph)
1426 {
1427         struct cam_ed *device;
1428
1429         device = periph->path->device;
1430
1431         if (device != NULL) {
1432                 struct periph_list *periph_head;
1433
1434                 periph_head = &device->periphs;
1435                 
1436                 /* Release the slot for this peripheral */
1437                 crit_enter();
1438                 camq_resize(&device->drvq, device->drvq.array_size - 1);
1439
1440                 device->generation++;
1441
1442                 SLIST_REMOVE(periph_head, periph, cam_periph, periph_links);
1443                 crit_exit();
1444         }
1445
1446         xsoftc.generation++;
1447
1448 }
1449
1450 void
1451 xpt_announce_periph(struct cam_periph *periph, char *announce_string)
1452 {
1453         u_int mb;
1454         struct cam_path *path;
1455         struct ccb_trans_settings cts;
1456
1457         path = periph->path;
1458         /*
1459          * To ensure that this is printed in one piece,
1460          * mask out CAM interrupts.
1461          */
1462         crit_enter();
1463         printf("%s%d at %s%d bus %d target %d lun %d\n",
1464                periph->periph_name, periph->unit_number,
1465                path->bus->sim->sim_name,
1466                path->bus->sim->unit_number,
1467                path->bus->sim->bus_id,
1468                path->target->target_id,
1469                path->device->lun_id);
1470         printf("%s%d: ", periph->periph_name, periph->unit_number);
1471         scsi_print_inquiry(&path->device->inq_data);
1472         if ((bootverbose)
1473          && (path->device->serial_num_len > 0)) {
1474                 /* Don't wrap the screen  - print only the first 60 chars */
1475                 printf("%s%d: Serial Number %.60s\n", periph->periph_name,
1476                        periph->unit_number, path->device->serial_num);
1477         }
1478         xpt_setup_ccb(&cts.ccb_h, path, /*priority*/1);
1479         cts.ccb_h.func_code = XPT_GET_TRAN_SETTINGS;
1480         cts.flags = CCB_TRANS_CURRENT_SETTINGS;
1481         xpt_action((union ccb*)&cts);
1482         if (cts.ccb_h.status == CAM_REQ_CMP) {
1483                 u_int speed;
1484                 u_int freq;
1485
1486                 if ((cts.valid & CCB_TRANS_SYNC_OFFSET_VALID) != 0
1487                   && cts.sync_offset != 0) {
1488                         freq = scsi_calc_syncsrate(cts.sync_period);
1489                         speed = freq;
1490                 } else {
1491                         struct ccb_pathinq cpi;
1492
1493                         /* Ask the SIM for its base transfer speed */
1494                         xpt_setup_ccb(&cpi.ccb_h, path, /*priority*/1);
1495                         cpi.ccb_h.func_code = XPT_PATH_INQ;
1496                         xpt_action((union ccb *)&cpi);
1497
1498                         speed = cpi.base_transfer_speed;
1499                         freq = 0;
1500                 }
1501                 if ((cts.valid & CCB_TRANS_BUS_WIDTH_VALID) != 0)
1502                         speed *= (0x01 << cts.bus_width);
1503                 mb = speed / 1000;
1504                 if (mb > 0)
1505                         printf("%s%d: %d.%03dMB/s transfers",
1506                                periph->periph_name, periph->unit_number,
1507                                mb, speed % 1000);
1508                 else
1509                         printf("%s%d: %dKB/s transfers", periph->periph_name,
1510                                periph->unit_number, speed);
1511                 if ((cts.valid & CCB_TRANS_SYNC_OFFSET_VALID) != 0
1512                  && cts.sync_offset != 0) {
1513                         printf(" (%d.%03dMHz, offset %d", freq / 1000,
1514                                freq % 1000, cts.sync_offset);
1515                 }
1516                 if ((cts.valid & CCB_TRANS_BUS_WIDTH_VALID) != 0
1517                  && cts.bus_width > 0) {
1518                         if ((cts.valid & CCB_TRANS_SYNC_OFFSET_VALID) != 0
1519                          && cts.sync_offset != 0) {
1520                                 printf(", ");
1521                         } else {
1522                                 printf(" (");
1523                         }
1524                         printf("%dbit)", 8 * (0x01 << cts.bus_width));
1525                 } else if ((cts.valid & CCB_TRANS_SYNC_OFFSET_VALID) != 0
1526                         && cts.sync_offset != 0) {
1527                         printf(")");
1528                 }
1529
1530                 if (path->device->inq_flags & SID_CmdQue
1531                  || path->device->flags & CAM_DEV_TAG_AFTER_COUNT) {
1532                         printf(", Tagged Queueing Enabled");
1533                 }
1534
1535                 printf("\n");
1536         } else if (path->device->inq_flags & SID_CmdQue
1537                 || path->device->flags & CAM_DEV_TAG_AFTER_COUNT) {
1538                 printf("%s%d: Tagged Queueing Enabled\n",
1539                        periph->periph_name, periph->unit_number);
1540         }
1541
1542         /*
1543          * We only want to print the caller's announce string if they've
1544          * passed one in..
1545          */
1546         if (announce_string != NULL)
1547                 printf("%s%d: %s\n", periph->periph_name,
1548                        periph->unit_number, announce_string);
1549         crit_exit();
1550 }
1551
1552
1553 static dev_match_ret
1554 xptbusmatch(struct dev_match_pattern *patterns, int num_patterns,
1555             struct cam_eb *bus)
1556 {
1557         dev_match_ret retval;
1558         int i;
1559
1560         retval = DM_RET_NONE;
1561
1562         /*
1563          * If we aren't given something to match against, that's an error.
1564          */
1565         if (bus == NULL)
1566                 return(DM_RET_ERROR);
1567
1568         /*
1569          * If there are no match entries, then this bus matches no
1570          * matter what.
1571          */
1572         if ((patterns == NULL) || (num_patterns == 0))
1573                 return(DM_RET_DESCEND | DM_RET_COPY);
1574
1575         for (i = 0; i < num_patterns; i++) {
1576                 struct bus_match_pattern *cur_pattern;
1577
1578                 /*
1579                  * If the pattern in question isn't for a bus node, we
1580                  * aren't interested.  However, we do indicate to the
1581                  * calling routine that we should continue descending the
1582                  * tree, since the user wants to match against lower-level
1583                  * EDT elements.
1584                  */
1585                 if (patterns[i].type != DEV_MATCH_BUS) {
1586                         if ((retval & DM_RET_ACTION_MASK) == DM_RET_NONE)
1587                                 retval |= DM_RET_DESCEND;
1588                         continue;
1589                 }
1590
1591                 cur_pattern = &patterns[i].pattern.bus_pattern;
1592
1593                 /*
1594                  * If they want to match any bus node, we give them any
1595                  * device node.
1596                  */
1597                 if (cur_pattern->flags == BUS_MATCH_ANY) {
1598                         /* set the copy flag */
1599                         retval |= DM_RET_COPY;
1600
1601                         /*
1602                          * If we've already decided on an action, go ahead
1603                          * and return.
1604                          */
1605                         if ((retval & DM_RET_ACTION_MASK) != DM_RET_NONE)
1606                                 return(retval);
1607                 }
1608
1609                 /*
1610                  * Not sure why someone would do this...
1611                  */
1612                 if (cur_pattern->flags == BUS_MATCH_NONE)
1613                         continue;
1614
1615                 if (((cur_pattern->flags & BUS_MATCH_PATH) != 0)
1616                  && (cur_pattern->path_id != bus->path_id))
1617                         continue;
1618
1619                 if (((cur_pattern->flags & BUS_MATCH_BUS_ID) != 0)
1620                  && (cur_pattern->bus_id != bus->sim->bus_id))
1621                         continue;
1622
1623                 if (((cur_pattern->flags & BUS_MATCH_UNIT) != 0)
1624                  && (cur_pattern->unit_number != bus->sim->unit_number))
1625                         continue;
1626
1627                 if (((cur_pattern->flags & BUS_MATCH_NAME) != 0)
1628                  && (strncmp(cur_pattern->dev_name, bus->sim->sim_name,
1629                              DEV_IDLEN) != 0))
1630                         continue;
1631
1632                 /*
1633                  * If we get to this point, the user definitely wants 
1634                  * information on this bus.  So tell the caller to copy the
1635                  * data out.
1636                  */
1637                 retval |= DM_RET_COPY;
1638
1639                 /*
1640                  * If the return action has been set to descend, then we
1641                  * know that we've already seen a non-bus matching
1642                  * expression, therefore we need to further descend the tree.
1643                  * This won't change by continuing around the loop, so we
1644                  * go ahead and return.  If we haven't seen a non-bus
1645                  * matching expression, we keep going around the loop until
1646                  * we exhaust the matching expressions.  We'll set the stop
1647                  * flag once we fall out of the loop.
1648                  */
1649                 if ((retval & DM_RET_ACTION_MASK) == DM_RET_DESCEND)
1650                         return(retval);
1651         }
1652
1653         /*
1654          * If the return action hasn't been set to descend yet, that means
1655          * we haven't seen anything other than bus matching patterns.  So
1656          * tell the caller to stop descending the tree -- the user doesn't
1657          * want to match against lower level tree elements.
1658          */
1659         if ((retval & DM_RET_ACTION_MASK) == DM_RET_NONE)
1660                 retval |= DM_RET_STOP;
1661
1662         return(retval);
1663 }
1664
1665 static dev_match_ret
1666 xptdevicematch(struct dev_match_pattern *patterns, int num_patterns,
1667                struct cam_ed *device)
1668 {
1669         dev_match_ret retval;
1670         int i;
1671
1672         retval = DM_RET_NONE;
1673
1674         /*
1675          * If we aren't given something to match against, that's an error.
1676          */
1677         if (device == NULL)
1678                 return(DM_RET_ERROR);
1679
1680         /*
1681          * If there are no match entries, then this device matches no
1682          * matter what.
1683          */
1684         if ((patterns == NULL) || (patterns == 0))
1685                 return(DM_RET_DESCEND | DM_RET_COPY);
1686
1687         for (i = 0; i < num_patterns; i++) {
1688                 struct device_match_pattern *cur_pattern;
1689
1690                 /*
1691                  * If the pattern in question isn't for a device node, we
1692                  * aren't interested.
1693                  */
1694                 if (patterns[i].type != DEV_MATCH_DEVICE) {
1695                         if ((patterns[i].type == DEV_MATCH_PERIPH)
1696                          && ((retval & DM_RET_ACTION_MASK) == DM_RET_NONE))
1697                                 retval |= DM_RET_DESCEND;
1698                         continue;
1699                 }
1700
1701                 cur_pattern = &patterns[i].pattern.device_pattern;
1702
1703                 /*
1704                  * If they want to match any device node, we give them any
1705                  * device node.
1706                  */
1707                 if (cur_pattern->flags == DEV_MATCH_ANY) {
1708                         /* set the copy flag */
1709                         retval |= DM_RET_COPY;
1710
1711                         
1712                         /*
1713                          * If we've already decided on an action, go ahead
1714                          * and return.
1715                          */
1716                         if ((retval & DM_RET_ACTION_MASK) != DM_RET_NONE)
1717                                 return(retval);
1718                 }
1719
1720                 /*
1721                  * Not sure why someone would do this...
1722                  */
1723                 if (cur_pattern->flags == DEV_MATCH_NONE)
1724                         continue;
1725
1726                 if (((cur_pattern->flags & DEV_MATCH_PATH) != 0)
1727                  && (cur_pattern->path_id != device->target->bus->path_id))
1728                         continue;
1729
1730                 if (((cur_pattern->flags & DEV_MATCH_TARGET) != 0)
1731                  && (cur_pattern->target_id != device->target->target_id))
1732                         continue;
1733
1734                 if (((cur_pattern->flags & DEV_MATCH_LUN) != 0)
1735                  && (cur_pattern->target_lun != device->lun_id))
1736                         continue;
1737
1738                 if (((cur_pattern->flags & DEV_MATCH_INQUIRY) != 0)
1739                  && (cam_quirkmatch((caddr_t)&device->inq_data,
1740                                     (caddr_t)&cur_pattern->inq_pat,
1741                                     1, sizeof(cur_pattern->inq_pat),
1742                                     scsi_static_inquiry_match) == NULL))
1743                         continue;
1744
1745                 /*
1746                  * If we get to this point, the user definitely wants 
1747                  * information on this device.  So tell the caller to copy
1748                  * the data out.
1749                  */
1750                 retval |= DM_RET_COPY;
1751
1752                 /*
1753                  * If the return action has been set to descend, then we
1754                  * know that we've already seen a peripheral matching
1755                  * expression, therefore we need to further descend the tree.
1756                  * This won't change by continuing around the loop, so we
1757                  * go ahead and return.  If we haven't seen a peripheral
1758                  * matching expression, we keep going around the loop until
1759                  * we exhaust the matching expressions.  We'll set the stop
1760                  * flag once we fall out of the loop.
1761                  */
1762                 if ((retval & DM_RET_ACTION_MASK) == DM_RET_DESCEND)
1763                         return(retval);
1764         }
1765
1766         /*
1767          * If the return action hasn't been set to descend yet, that means
1768          * we haven't seen any peripheral matching patterns.  So tell the
1769          * caller to stop descending the tree -- the user doesn't want to
1770          * match against lower level tree elements.
1771          */
1772         if ((retval & DM_RET_ACTION_MASK) == DM_RET_NONE)
1773                 retval |= DM_RET_STOP;
1774
1775         return(retval);
1776 }
1777
1778 /*
1779  * Match a single peripheral against any number of match patterns.
1780  */
1781 static dev_match_ret
1782 xptperiphmatch(struct dev_match_pattern *patterns, int num_patterns,
1783                struct cam_periph *periph)
1784 {
1785         dev_match_ret retval;
1786         int i;
1787
1788         /*
1789          * If we aren't given something to match against, that's an error.
1790          */
1791         if (periph == NULL)
1792                 return(DM_RET_ERROR);
1793
1794         /*
1795          * If there are no match entries, then this peripheral matches no
1796          * matter what.
1797          */
1798         if ((patterns == NULL) || (num_patterns == 0))
1799                 return(DM_RET_STOP | DM_RET_COPY);
1800
1801         /*
1802          * There aren't any nodes below a peripheral node, so there's no
1803          * reason to descend the tree any further.
1804          */
1805         retval = DM_RET_STOP;
1806
1807         for (i = 0; i < num_patterns; i++) {
1808                 struct periph_match_pattern *cur_pattern;
1809
1810                 /*
1811                  * If the pattern in question isn't for a peripheral, we
1812                  * aren't interested.
1813                  */
1814                 if (patterns[i].type != DEV_MATCH_PERIPH)
1815                         continue;
1816
1817                 cur_pattern = &patterns[i].pattern.periph_pattern;
1818
1819                 /*
1820                  * If they want to match on anything, then we will do so.
1821                  */
1822                 if (cur_pattern->flags == PERIPH_MATCH_ANY) {
1823                         /* set the copy flag */
1824                         retval |= DM_RET_COPY;
1825
1826                         /*
1827                          * We've already set the return action to stop,
1828                          * since there are no nodes below peripherals in
1829                          * the tree.
1830                          */
1831                         return(retval);
1832                 }
1833
1834                 /*
1835                  * Not sure why someone would do this...
1836                  */
1837                 if (cur_pattern->flags == PERIPH_MATCH_NONE)
1838                         continue;
1839
1840                 if (((cur_pattern->flags & PERIPH_MATCH_PATH) != 0)
1841                  && (cur_pattern->path_id != periph->path->bus->path_id))
1842                         continue;
1843
1844                 /*
1845                  * For the target and lun id's, we have to make sure the
1846                  * target and lun pointers aren't NULL.  The xpt peripheral
1847                  * has a wildcard target and device.
1848                  */
1849                 if (((cur_pattern->flags & PERIPH_MATCH_TARGET) != 0)
1850                  && ((periph->path->target == NULL)
1851                  ||(cur_pattern->target_id != periph->path->target->target_id)))
1852                         continue;
1853
1854                 if (((cur_pattern->flags & PERIPH_MATCH_LUN) != 0)
1855                  && ((periph->path->device == NULL)
1856                  || (cur_pattern->target_lun != periph->path->device->lun_id)))
1857                         continue;
1858
1859                 if (((cur_pattern->flags & PERIPH_MATCH_UNIT) != 0)
1860                  && (cur_pattern->unit_number != periph->unit_number))
1861                         continue;
1862
1863                 if (((cur_pattern->flags & PERIPH_MATCH_NAME) != 0)
1864                  && (strncmp(cur_pattern->periph_name, periph->periph_name,
1865                              DEV_IDLEN) != 0))
1866                         continue;
1867
1868                 /*
1869                  * If we get to this point, the user definitely wants 
1870                  * information on this peripheral.  So tell the caller to
1871                  * copy the data out.
1872                  */
1873                 retval |= DM_RET_COPY;
1874
1875                 /*
1876                  * The return action has already been set to stop, since
1877                  * peripherals don't have any nodes below them in the EDT.
1878                  */
1879                 return(retval);
1880         }
1881
1882         /*
1883          * If we get to this point, the peripheral that was passed in
1884          * doesn't match any of the patterns.
1885          */
1886         return(retval);
1887 }
1888
1889 static int
1890 xptedtbusfunc(struct cam_eb *bus, void *arg)
1891 {
1892         struct ccb_dev_match *cdm;
1893         dev_match_ret retval;
1894
1895         cdm = (struct ccb_dev_match *)arg;
1896
1897         /*
1898          * If our position is for something deeper in the tree, that means
1899          * that we've already seen this node.  So, we keep going down.
1900          */
1901         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
1902          && (cdm->pos.cookie.bus == bus)
1903          && (cdm->pos.position_type & CAM_DEV_POS_TARGET)
1904          && (cdm->pos.cookie.target != NULL))
1905                 retval = DM_RET_DESCEND;
1906         else
1907                 retval = xptbusmatch(cdm->patterns, cdm->num_patterns, bus);
1908
1909         /*
1910          * If we got an error, bail out of the search.
1911          */
1912         if ((retval & DM_RET_ACTION_MASK) == DM_RET_ERROR) {
1913                 cdm->status = CAM_DEV_MATCH_ERROR;
1914                 return(0);
1915         }
1916
1917         /*
1918          * If the copy flag is set, copy this bus out.
1919          */
1920         if (retval & DM_RET_COPY) {
1921                 int spaceleft, j;
1922
1923                 spaceleft = cdm->match_buf_len - (cdm->num_matches *
1924                         sizeof(struct dev_match_result));
1925
1926                 /*
1927                  * If we don't have enough space to put in another
1928                  * match result, save our position and tell the
1929                  * user there are more devices to check.
1930                  */
1931                 if (spaceleft < sizeof(struct dev_match_result)) {
1932                         bzero(&cdm->pos, sizeof(cdm->pos));
1933                         cdm->pos.position_type = 
1934                                 CAM_DEV_POS_EDT | CAM_DEV_POS_BUS;
1935
1936                         cdm->pos.cookie.bus = bus;
1937                         cdm->pos.generations[CAM_BUS_GENERATION]=
1938                                 bus_generation;
1939                         cdm->status = CAM_DEV_MATCH_MORE;
1940                         return(0);
1941                 }
1942                 j = cdm->num_matches;
1943                 cdm->num_matches++;
1944                 cdm->matches[j].type = DEV_MATCH_BUS;
1945                 cdm->matches[j].result.bus_result.path_id = bus->path_id;
1946                 cdm->matches[j].result.bus_result.bus_id = bus->sim->bus_id;
1947                 cdm->matches[j].result.bus_result.unit_number =
1948                         bus->sim->unit_number;
1949                 strncpy(cdm->matches[j].result.bus_result.dev_name,
1950                         bus->sim->sim_name, DEV_IDLEN);
1951         }
1952
1953         /*
1954          * If the user is only interested in busses, there's no
1955          * reason to descend to the next level in the tree.
1956          */
1957         if ((retval & DM_RET_ACTION_MASK) == DM_RET_STOP)
1958                 return(1);
1959
1960         /*
1961          * If there is a target generation recorded, check it to
1962          * make sure the target list hasn't changed.
1963          */
1964         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
1965          && (bus == cdm->pos.cookie.bus)
1966          && (cdm->pos.position_type & CAM_DEV_POS_TARGET)
1967          && (cdm->pos.generations[CAM_TARGET_GENERATION] != 0)
1968          && (cdm->pos.generations[CAM_TARGET_GENERATION] !=
1969              bus->generation)) {
1970                 cdm->status = CAM_DEV_MATCH_LIST_CHANGED;
1971                 return(0);
1972         }
1973
1974         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
1975          && (cdm->pos.cookie.bus == bus)
1976          && (cdm->pos.position_type & CAM_DEV_POS_TARGET)
1977          && (cdm->pos.cookie.target != NULL))
1978                 return(xpttargettraverse(bus,
1979                                         (struct cam_et *)cdm->pos.cookie.target,
1980                                          xptedttargetfunc, arg));
1981         else
1982                 return(xpttargettraverse(bus, NULL, xptedttargetfunc, arg));
1983 }
1984
1985 static int
1986 xptedttargetfunc(struct cam_et *target, void *arg)
1987 {
1988         struct ccb_dev_match *cdm;
1989
1990         cdm = (struct ccb_dev_match *)arg;
1991
1992         /*
1993          * If there is a device list generation recorded, check it to
1994          * make sure the device list hasn't changed.
1995          */
1996         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
1997          && (cdm->pos.cookie.bus == target->bus)
1998          && (cdm->pos.position_type & CAM_DEV_POS_TARGET)
1999          && (cdm->pos.cookie.target == target)
2000          && (cdm->pos.position_type & CAM_DEV_POS_DEVICE)
2001          && (cdm->pos.generations[CAM_DEV_GENERATION] != 0)
2002          && (cdm->pos.generations[CAM_DEV_GENERATION] !=
2003              target->generation)) {
2004                 cdm->status = CAM_DEV_MATCH_LIST_CHANGED;
2005                 return(0);
2006         }
2007
2008         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
2009          && (cdm->pos.cookie.bus == target->bus)
2010          && (cdm->pos.position_type & CAM_DEV_POS_TARGET)
2011          && (cdm->pos.cookie.target == target)
2012          && (cdm->pos.position_type & CAM_DEV_POS_DEVICE)
2013          && (cdm->pos.cookie.device != NULL))
2014                 return(xptdevicetraverse(target,
2015                                         (struct cam_ed *)cdm->pos.cookie.device,
2016                                          xptedtdevicefunc, arg));
2017         else
2018                 return(xptdevicetraverse(target, NULL, xptedtdevicefunc, arg));
2019 }
2020
2021 static int
2022 xptedtdevicefunc(struct cam_ed *device, void *arg)
2023 {
2024
2025         struct ccb_dev_match *cdm;
2026         dev_match_ret retval;
2027
2028         cdm = (struct ccb_dev_match *)arg;
2029
2030         /*
2031          * If our position is for something deeper in the tree, that means
2032          * that we've already seen this node.  So, we keep going down.
2033          */
2034         if ((cdm->pos.position_type & CAM_DEV_POS_DEVICE)
2035          && (cdm->pos.cookie.device == device)
2036          && (cdm->pos.position_type & CAM_DEV_POS_PERIPH)
2037          && (cdm->pos.cookie.periph != NULL))
2038                 retval = DM_RET_DESCEND;
2039         else
2040                 retval = xptdevicematch(cdm->patterns, cdm->num_patterns,
2041                                         device);
2042
2043         if ((retval & DM_RET_ACTION_MASK) == DM_RET_ERROR) {
2044                 cdm->status = CAM_DEV_MATCH_ERROR;
2045                 return(0);
2046         }
2047
2048         /*
2049          * If the copy flag is set, copy this device out.
2050          */
2051         if (retval & DM_RET_COPY) {
2052                 int spaceleft, j;
2053
2054                 spaceleft = cdm->match_buf_len - (cdm->num_matches *
2055                         sizeof(struct dev_match_result));
2056
2057                 /*
2058                  * If we don't have enough space to put in another
2059                  * match result, save our position and tell the
2060                  * user there are more devices to check.
2061                  */
2062                 if (spaceleft < sizeof(struct dev_match_result)) {
2063                         bzero(&cdm->pos, sizeof(cdm->pos));
2064                         cdm->pos.position_type = 
2065                                 CAM_DEV_POS_EDT | CAM_DEV_POS_BUS |
2066                                 CAM_DEV_POS_TARGET | CAM_DEV_POS_DEVICE;
2067
2068                         cdm->pos.cookie.bus = device->target->bus;
2069                         cdm->pos.generations[CAM_BUS_GENERATION]=
2070                                 bus_generation;
2071                         cdm->pos.cookie.target = device->target;
2072                         cdm->pos.generations[CAM_TARGET_GENERATION] =
2073                                 device->target->bus->generation;
2074                         cdm->pos.cookie.device = device;
2075                         cdm->pos.generations[CAM_DEV_GENERATION] = 
2076                                 device->target->generation;
2077                         cdm->status = CAM_DEV_MATCH_MORE;
2078                         return(0);
2079                 }
2080                 j = cdm->num_matches;
2081                 cdm->num_matches++;
2082                 cdm->matches[j].type = DEV_MATCH_DEVICE;
2083                 cdm->matches[j].result.device_result.path_id =
2084                         device->target->bus->path_id;
2085                 cdm->matches[j].result.device_result.target_id =
2086                         device->target->target_id;
2087                 cdm->matches[j].result.device_result.target_lun =
2088                         device->lun_id;
2089                 bcopy(&device->inq_data,
2090                       &cdm->matches[j].result.device_result.inq_data,
2091                       sizeof(struct scsi_inquiry_data));
2092
2093                 /* Let the user know whether this device is unconfigured */
2094                 if (device->flags & CAM_DEV_UNCONFIGURED)
2095                         cdm->matches[j].result.device_result.flags =
2096                                 DEV_RESULT_UNCONFIGURED;
2097                 else
2098                         cdm->matches[j].result.device_result.flags =
2099                                 DEV_RESULT_NOFLAG;
2100         }
2101
2102         /*
2103          * If the user isn't interested in peripherals, don't descend
2104          * the tree any further.
2105          */
2106         if ((retval & DM_RET_ACTION_MASK) == DM_RET_STOP)
2107                 return(1);
2108
2109         /*
2110          * If there is a peripheral list generation recorded, make sure
2111          * it hasn't changed.
2112          */
2113         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
2114          && (device->target->bus == cdm->pos.cookie.bus)
2115          && (cdm->pos.position_type & CAM_DEV_POS_TARGET)
2116          && (device->target == cdm->pos.cookie.target)
2117          && (cdm->pos.position_type & CAM_DEV_POS_DEVICE)
2118          && (device == cdm->pos.cookie.device)
2119          && (cdm->pos.position_type & CAM_DEV_POS_PERIPH)
2120          && (cdm->pos.generations[CAM_PERIPH_GENERATION] != 0)
2121          && (cdm->pos.generations[CAM_PERIPH_GENERATION] !=
2122              device->generation)){
2123                 cdm->status = CAM_DEV_MATCH_LIST_CHANGED;
2124                 return(0);
2125         }
2126
2127         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
2128          && (cdm->pos.cookie.bus == device->target->bus)
2129          && (cdm->pos.position_type & CAM_DEV_POS_TARGET)
2130          && (cdm->pos.cookie.target == device->target)
2131          && (cdm->pos.position_type & CAM_DEV_POS_DEVICE)
2132          && (cdm->pos.cookie.device == device)
2133          && (cdm->pos.position_type & CAM_DEV_POS_PERIPH)
2134          && (cdm->pos.cookie.periph != NULL))
2135                 return(xptperiphtraverse(device,
2136                                 (struct cam_periph *)cdm->pos.cookie.periph,
2137                                 xptedtperiphfunc, arg));
2138         else
2139                 return(xptperiphtraverse(device, NULL, xptedtperiphfunc, arg));
2140 }
2141
2142 static int
2143 xptedtperiphfunc(struct cam_periph *periph, void *arg)
2144 {
2145         struct ccb_dev_match *cdm;
2146         dev_match_ret retval;
2147
2148         cdm = (struct ccb_dev_match *)arg;
2149
2150         retval = xptperiphmatch(cdm->patterns, cdm->num_patterns, periph);
2151
2152         if ((retval & DM_RET_ACTION_MASK) == DM_RET_ERROR) {
2153                 cdm->status = CAM_DEV_MATCH_ERROR;
2154                 return(0);
2155         }
2156
2157         /*
2158          * If the copy flag is set, copy this peripheral out.
2159          */
2160         if (retval & DM_RET_COPY) {
2161                 int spaceleft, j;
2162
2163                 spaceleft = cdm->match_buf_len - (cdm->num_matches *
2164                         sizeof(struct dev_match_result));
2165
2166                 /*
2167                  * If we don't have enough space to put in another
2168                  * match result, save our position and tell the
2169                  * user there are more devices to check.
2170                  */
2171                 if (spaceleft < sizeof(struct dev_match_result)) {
2172                         bzero(&cdm->pos, sizeof(cdm->pos));
2173                         cdm->pos.position_type = 
2174                                 CAM_DEV_POS_EDT | CAM_DEV_POS_BUS |
2175                                 CAM_DEV_POS_TARGET | CAM_DEV_POS_DEVICE |
2176                                 CAM_DEV_POS_PERIPH;
2177
2178                         cdm->pos.cookie.bus = periph->path->bus;
2179                         cdm->pos.generations[CAM_BUS_GENERATION]=
2180                                 bus_generation;
2181                         cdm->pos.cookie.target = periph->path->target;
2182                         cdm->pos.generations[CAM_TARGET_GENERATION] =
2183                                 periph->path->bus->generation;
2184                         cdm->pos.cookie.device = periph->path->device;
2185                         cdm->pos.generations[CAM_DEV_GENERATION] = 
2186                                 periph->path->target->generation;
2187                         cdm->pos.cookie.periph = periph;
2188                         cdm->pos.generations[CAM_PERIPH_GENERATION] =
2189                                 periph->path->device->generation;
2190                         cdm->status = CAM_DEV_MATCH_MORE;
2191                         return(0);
2192                 }
2193
2194                 j = cdm->num_matches;
2195                 cdm->num_matches++;
2196                 cdm->matches[j].type = DEV_MATCH_PERIPH;
2197                 cdm->matches[j].result.periph_result.path_id =
2198                         periph->path->bus->path_id;
2199                 cdm->matches[j].result.periph_result.target_id =
2200                         periph->path->target->target_id;
2201                 cdm->matches[j].result.periph_result.target_lun =
2202                         periph->path->device->lun_id;
2203                 cdm->matches[j].result.periph_result.unit_number =
2204                         periph->unit_number;
2205                 strncpy(cdm->matches[j].result.periph_result.periph_name,
2206                         periph->periph_name, DEV_IDLEN);
2207         }
2208
2209         return(1);
2210 }
2211
2212 static int
2213 xptedtmatch(struct ccb_dev_match *cdm)
2214 {
2215         int ret;
2216
2217         cdm->num_matches = 0;
2218
2219         /*
2220          * Check the bus list generation.  If it has changed, the user
2221          * needs to reset everything and start over.
2222          */
2223         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
2224          && (cdm->pos.generations[CAM_BUS_GENERATION] != 0)
2225          && (cdm->pos.generations[CAM_BUS_GENERATION] != bus_generation)) {
2226                 cdm->status = CAM_DEV_MATCH_LIST_CHANGED;
2227                 return(0);
2228         }
2229
2230         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
2231          && (cdm->pos.cookie.bus != NULL))
2232                 ret = xptbustraverse((struct cam_eb *)cdm->pos.cookie.bus,
2233                                      xptedtbusfunc, cdm);
2234         else
2235                 ret = xptbustraverse(NULL, xptedtbusfunc, cdm);
2236
2237         /*
2238          * If we get back 0, that means that we had to stop before fully
2239          * traversing the EDT.  It also means that one of the subroutines
2240          * has set the status field to the proper value.  If we get back 1,
2241          * we've fully traversed the EDT and copied out any matching entries.
2242          */
2243         if (ret == 1)
2244                 cdm->status = CAM_DEV_MATCH_LAST;
2245
2246         return(ret);
2247 }
2248
2249 static int
2250 xptplistpdrvfunc(struct periph_driver **pdrv, void *arg)
2251 {
2252         struct ccb_dev_match *cdm;
2253
2254         cdm = (struct ccb_dev_match *)arg;
2255
2256         if ((cdm->pos.position_type & CAM_DEV_POS_PDPTR)
2257          && (cdm->pos.cookie.pdrv == pdrv)
2258          && (cdm->pos.position_type & CAM_DEV_POS_PERIPH)
2259          && (cdm->pos.generations[CAM_PERIPH_GENERATION] != 0)
2260          && (cdm->pos.generations[CAM_PERIPH_GENERATION] !=
2261              (*pdrv)->generation)) {
2262                 cdm->status = CAM_DEV_MATCH_LIST_CHANGED;
2263                 return(0);
2264         }
2265
2266         if ((cdm->pos.position_type & CAM_DEV_POS_PDPTR)
2267          && (cdm->pos.cookie.pdrv == pdrv)
2268          && (cdm->pos.position_type & CAM_DEV_POS_PERIPH)
2269          && (cdm->pos.cookie.periph != NULL))
2270                 return(xptpdperiphtraverse(pdrv,
2271                                 (struct cam_periph *)cdm->pos.cookie.periph,
2272                                 xptplistperiphfunc, arg));
2273         else
2274                 return(xptpdperiphtraverse(pdrv, NULL,xptplistperiphfunc, arg));
2275 }
2276
2277 static int
2278 xptplistperiphfunc(struct cam_periph *periph, void *arg)
2279 {
2280         struct ccb_dev_match *cdm;
2281         dev_match_ret retval;
2282
2283         cdm = (struct ccb_dev_match *)arg;
2284
2285         retval = xptperiphmatch(cdm->patterns, cdm->num_patterns, periph);
2286
2287         if ((retval & DM_RET_ACTION_MASK) == DM_RET_ERROR) {
2288                 cdm->status = CAM_DEV_MATCH_ERROR;
2289                 return(0);
2290         }
2291
2292         /*
2293          * If the copy flag is set, copy this peripheral out.
2294          */
2295         if (retval & DM_RET_COPY) {
2296                 int spaceleft, j;
2297
2298                 spaceleft = cdm->match_buf_len - (cdm->num_matches *
2299                         sizeof(struct dev_match_result));
2300
2301                 /*
2302                  * If we don't have enough space to put in another
2303                  * match result, save our position and tell the
2304                  * user there are more devices to check.
2305                  */
2306                 if (spaceleft < sizeof(struct dev_match_result)) {
2307                         struct periph_driver **pdrv;
2308
2309                         pdrv = NULL;
2310                         bzero(&cdm->pos, sizeof(cdm->pos));
2311                         cdm->pos.position_type = 
2312                                 CAM_DEV_POS_PDRV | CAM_DEV_POS_PDPTR |
2313                                 CAM_DEV_POS_PERIPH;
2314
2315                         /*
2316                          * This may look a bit non-sensical, but it is
2317                          * actually quite logical.  There are very few
2318                          * peripheral drivers, and bloating every peripheral
2319                          * structure with a pointer back to its parent
2320                          * peripheral driver linker set entry would cost
2321                          * more in the long run than doing this quick lookup.
2322                          */
2323                         SET_FOREACH(pdrv, periphdriver_set) {
2324                                 if (strcmp((*pdrv)->driver_name,
2325                                     periph->periph_name) == 0)
2326                                         break;
2327                         }
2328
2329                         if (*pdrv == NULL) {
2330                                 cdm->status = CAM_DEV_MATCH_ERROR;
2331                                 return(0);
2332                         }
2333
2334                         cdm->pos.cookie.pdrv = pdrv;
2335                         /*
2336                          * The periph generation slot does double duty, as
2337                          * does the periph pointer slot.  They are used for
2338                          * both edt and pdrv lookups and positioning.
2339                          */
2340                         cdm->pos.cookie.periph = periph;
2341                         cdm->pos.generations[CAM_PERIPH_GENERATION] =
2342                                 (*pdrv)->generation;
2343                         cdm->status = CAM_DEV_MATCH_MORE;
2344                         return(0);
2345                 }
2346
2347                 j = cdm->num_matches;
2348                 cdm->num_matches++;
2349                 cdm->matches[j].type = DEV_MATCH_PERIPH;
2350                 cdm->matches[j].result.periph_result.path_id =
2351                         periph->path->bus->path_id;
2352
2353                 /*
2354                  * The transport layer peripheral doesn't have a target or
2355                  * lun.
2356                  */
2357                 if (periph->path->target)
2358                         cdm->matches[j].result.periph_result.target_id =
2359                                 periph->path->target->target_id;
2360                 else
2361                         cdm->matches[j].result.periph_result.target_id = -1;
2362
2363                 if (periph->path->device)
2364                         cdm->matches[j].result.periph_result.target_lun =
2365                                 periph->path->device->lun_id;
2366                 else
2367                         cdm->matches[j].result.periph_result.target_lun = -1;
2368
2369                 cdm->matches[j].result.periph_result.unit_number =
2370                         periph->unit_number;
2371                 strncpy(cdm->matches[j].result.periph_result.periph_name,
2372                         periph->periph_name, DEV_IDLEN);
2373         }
2374
2375         return(1);
2376 }
2377
2378 static int
2379 xptperiphlistmatch(struct ccb_dev_match *cdm)
2380 {
2381         int ret;
2382
2383         cdm->num_matches = 0;
2384
2385         /*
2386          * At this point in the edt traversal function, we check the bus
2387          * list generation to make sure that no busses have been added or
2388          * removed since the user last sent a XPT_DEV_MATCH ccb through.
2389          * For the peripheral driver list traversal function, however, we
2390          * don't have to worry about new peripheral driver types coming or
2391          * going; they're in a linker set, and therefore can't change
2392          * without a recompile.
2393          */
2394
2395         if ((cdm->pos.position_type & CAM_DEV_POS_PDPTR)
2396          && (cdm->pos.cookie.pdrv != NULL))
2397                 ret = xptpdrvtraverse(
2398                                 (struct periph_driver **)cdm->pos.cookie.pdrv,
2399                                 xptplistpdrvfunc, cdm);
2400         else
2401                 ret = xptpdrvtraverse(NULL, xptplistpdrvfunc, cdm);
2402
2403         /*
2404          * If we get back 0, that means that we had to stop before fully
2405          * traversing the peripheral driver tree.  It also means that one of
2406          * the subroutines has set the status field to the proper value.  If
2407          * we get back 1, we've fully traversed the EDT and copied out any
2408          * matching entries.
2409          */
2410         if (ret == 1)
2411                 cdm->status = CAM_DEV_MATCH_LAST;
2412
2413         return(ret);
2414 }
2415
2416 static int
2417 xptbustraverse(struct cam_eb *start_bus, xpt_busfunc_t *tr_func, void *arg)
2418 {
2419         struct cam_eb *bus, *next_bus;
2420         int retval;
2421
2422         retval = 1;
2423
2424         for (bus = (start_bus ? start_bus : TAILQ_FIRST(&xpt_busses));
2425              bus != NULL;
2426              bus = next_bus) {
2427                 next_bus = TAILQ_NEXT(bus, links);
2428
2429                 retval = tr_func(bus, arg);
2430                 if (retval == 0)
2431                         return(retval);
2432         }
2433
2434         return(retval);
2435 }
2436
2437 static int
2438 xpttargettraverse(struct cam_eb *bus, struct cam_et *start_target,
2439                   xpt_targetfunc_t *tr_func, void *arg)
2440 {
2441         struct cam_et *target, *next_target;
2442         int retval;
2443
2444         retval = 1;
2445         for (target = (start_target ? start_target :
2446                        TAILQ_FIRST(&bus->et_entries));
2447              target != NULL; target = next_target) {
2448
2449                 next_target = TAILQ_NEXT(target, links);
2450
2451                 retval = tr_func(target, arg);
2452
2453                 if (retval == 0)
2454                         return(retval);
2455         }
2456
2457         return(retval);
2458 }
2459
2460 static int
2461 xptdevicetraverse(struct cam_et *target, struct cam_ed *start_device,
2462                   xpt_devicefunc_t *tr_func, void *arg)
2463 {
2464         struct cam_ed *device, *next_device;
2465         int retval;
2466
2467         retval = 1;
2468         for (device = (start_device ? start_device :
2469                        TAILQ_FIRST(&target->ed_entries));
2470              device != NULL;
2471              device = next_device) {
2472
2473                 next_device = TAILQ_NEXT(device, links);
2474
2475                 retval = tr_func(device, arg);
2476
2477                 if (retval == 0)
2478                         return(retval);
2479         }
2480
2481         return(retval);
2482 }
2483
2484 static int
2485 xptperiphtraverse(struct cam_ed *device, struct cam_periph *start_periph,
2486                   xpt_periphfunc_t *tr_func, void *arg)
2487 {
2488         struct cam_periph *periph, *next_periph;
2489         int retval;
2490
2491         retval = 1;
2492
2493         for (periph = (start_periph ? start_periph :
2494                        SLIST_FIRST(&device->periphs));
2495              periph != NULL;
2496              periph = next_periph) {
2497
2498                 next_periph = SLIST_NEXT(periph, periph_links);
2499
2500                 retval = tr_func(periph, arg);
2501                 if (retval == 0)
2502                         return(retval);
2503         }
2504
2505         return(retval);
2506 }
2507
2508 static int
2509 xptpdrvtraverse(struct periph_driver **start_pdrv,
2510                 xpt_pdrvfunc_t *tr_func, void *arg)
2511 {
2512         struct periph_driver **pdrv;
2513         int retval;
2514
2515         retval = 1;
2516
2517         /*
2518          * We don't traverse the peripheral driver list like we do the
2519          * other lists, because it is a linker set, and therefore cannot be
2520          * changed during runtime.  If the peripheral driver list is ever
2521          * re-done to be something other than a linker set (i.e. it can
2522          * change while the system is running), the list traversal should
2523          * be modified to work like the other traversal functions.
2524          */
2525         SET_FOREACH(pdrv, periphdriver_set) {
2526                 if (start_pdrv == NULL || start_pdrv == pdrv) {
2527                         retval = tr_func(pdrv, arg);
2528                         if (retval == 0)
2529                                 return(retval);
2530                         start_pdrv = NULL; /* traverse remainder */
2531                 }
2532         }
2533         return(retval);
2534 }
2535
2536 static int
2537 xptpdperiphtraverse(struct periph_driver **pdrv,
2538                     struct cam_periph *start_periph,
2539                     xpt_periphfunc_t *tr_func, void *arg)
2540 {
2541         struct cam_periph *periph, *next_periph;
2542         int retval;
2543
2544         retval = 1;
2545
2546         for (periph = (start_periph ? start_periph :
2547              TAILQ_FIRST(&(*pdrv)->units)); periph != NULL;
2548              periph = next_periph) {
2549
2550                 next_periph = TAILQ_NEXT(periph, unit_links);
2551
2552                 retval = tr_func(periph, arg);
2553                 if (retval == 0)
2554                         return(retval);
2555         }
2556         return(retval);
2557 }
2558
2559 static int
2560 xptdefbusfunc(struct cam_eb *bus, void *arg)
2561 {
2562         struct xpt_traverse_config *tr_config;
2563
2564         tr_config = (struct xpt_traverse_config *)arg;
2565
2566         if (tr_config->depth == XPT_DEPTH_BUS) {
2567                 xpt_busfunc_t *tr_func;
2568
2569                 tr_func = (xpt_busfunc_t *)tr_config->tr_func;
2570
2571                 return(tr_func(bus, tr_config->tr_arg));
2572         } else
2573                 return(xpttargettraverse(bus, NULL, xptdeftargetfunc, arg));
2574 }
2575
2576 static int
2577 xptdeftargetfunc(struct cam_et *target, void *arg)
2578 {
2579         struct xpt_traverse_config *tr_config;
2580
2581         tr_config = (struct xpt_traverse_config *)arg;
2582
2583         if (tr_config->depth == XPT_DEPTH_TARGET) {
2584                 xpt_targetfunc_t *tr_func;
2585
2586                 tr_func = (xpt_targetfunc_t *)tr_config->tr_func;
2587
2588                 return(tr_func(target, tr_config->tr_arg));
2589         } else
2590                 return(xptdevicetraverse(target, NULL, xptdefdevicefunc, arg));
2591 }
2592
2593 static int
2594 xptdefdevicefunc(struct cam_ed *device, void *arg)
2595 {
2596         struct xpt_traverse_config *tr_config;
2597
2598         tr_config = (struct xpt_traverse_config *)arg;
2599
2600         if (tr_config->depth == XPT_DEPTH_DEVICE) {
2601                 xpt_devicefunc_t *tr_func;
2602
2603                 tr_func = (xpt_devicefunc_t *)tr_config->tr_func;
2604
2605                 return(tr_func(device, tr_config->tr_arg));
2606         } else
2607                 return(xptperiphtraverse(device, NULL, xptdefperiphfunc, arg));
2608 }
2609
2610 static int
2611 xptdefperiphfunc(struct cam_periph *periph, void *arg)
2612 {
2613         struct xpt_traverse_config *tr_config;
2614         xpt_periphfunc_t *tr_func;
2615
2616         tr_config = (struct xpt_traverse_config *)arg;
2617
2618         tr_func = (xpt_periphfunc_t *)tr_config->tr_func;
2619
2620         /*
2621          * Unlike the other default functions, we don't check for depth
2622          * here.  The peripheral driver level is the last level in the EDT,
2623          * so if we're here, we should execute the function in question.
2624          */
2625         return(tr_func(periph, tr_config->tr_arg));
2626 }
2627
2628 /*
2629  * Execute the given function for every bus in the EDT.
2630  */
2631 static int
2632 xpt_for_all_busses(xpt_busfunc_t *tr_func, void *arg)
2633 {
2634         struct xpt_traverse_config tr_config;
2635
2636         tr_config.depth = XPT_DEPTH_BUS;
2637         tr_config.tr_func = tr_func;
2638         tr_config.tr_arg = arg;
2639
2640         return(xptbustraverse(NULL, xptdefbusfunc, &tr_config));
2641 }
2642
2643 #ifdef notusedyet
2644 /*
2645  * Execute the given function for every target in the EDT.
2646  */
2647 static int
2648 xpt_for_all_targets(xpt_targetfunc_t *tr_func, void *arg)
2649 {
2650         struct xpt_traverse_config tr_config;
2651
2652         tr_config.depth = XPT_DEPTH_TARGET;
2653         tr_config.tr_func = tr_func;
2654         tr_config.tr_arg = arg;
2655
2656         return(xptbustraverse(NULL, xptdefbusfunc, &tr_config));
2657 }
2658 #endif /* notusedyet */
2659
2660 /*
2661  * Execute the given function for every device in the EDT.
2662  */
2663 static int
2664 xpt_for_all_devices(xpt_devicefunc_t *tr_func, void *arg)
2665 {
2666         struct xpt_traverse_config tr_config;
2667
2668         tr_config.depth = XPT_DEPTH_DEVICE;
2669         tr_config.tr_func = tr_func;
2670         tr_config.tr_arg = arg;
2671
2672         return(xptbustraverse(NULL, xptdefbusfunc, &tr_config));
2673 }
2674
2675 #ifdef notusedyet
2676 /*
2677  * Execute the given function for every peripheral in the EDT.
2678  */
2679 static int
2680 xpt_for_all_periphs(xpt_periphfunc_t *tr_func, void *arg)
2681 {
2682         struct xpt_traverse_config tr_config;
2683
2684         tr_config.depth = XPT_DEPTH_PERIPH;
2685         tr_config.tr_func = tr_func;
2686         tr_config.tr_arg = arg;
2687
2688         return(xptbustraverse(NULL, xptdefbusfunc, &tr_config));
2689 }
2690 #endif /* notusedyet */
2691
2692 static int
2693 xptsetasyncfunc(struct cam_ed *device, void *arg)
2694 {
2695         struct cam_path path;
2696         struct ccb_getdev cgd;
2697         struct async_node *cur_entry;
2698
2699         cur_entry = (struct async_node *)arg;
2700
2701         /*
2702          * Don't report unconfigured devices (Wildcard devs,
2703          * devices only for target mode, device instances
2704          * that have been invalidated but are waiting for
2705          * their last reference count to be released).
2706          */
2707         if ((device->flags & CAM_DEV_UNCONFIGURED) != 0)
2708                 return (1);
2709
2710         xpt_compile_path(&path,
2711                          NULL,
2712                          device->target->bus->path_id,
2713                          device->target->target_id,
2714                          device->lun_id);
2715         xpt_setup_ccb(&cgd.ccb_h, &path, /*priority*/1);
2716         cgd.ccb_h.func_code = XPT_GDEV_TYPE;
2717         xpt_action((union ccb *)&cgd);
2718         cur_entry->callback(cur_entry->callback_arg,
2719                             AC_FOUND_DEVICE,
2720                             &path, &cgd);
2721         xpt_release_path(&path);
2722
2723         return(1);
2724 }
2725
2726 static int
2727 xptsetasyncbusfunc(struct cam_eb *bus, void *arg)
2728 {
2729         struct cam_path path;
2730         struct ccb_pathinq cpi;
2731         struct async_node *cur_entry;
2732
2733         cur_entry = (struct async_node *)arg;
2734
2735         xpt_compile_path(&path, /*periph*/NULL,
2736                          bus->sim->path_id,
2737                          CAM_TARGET_WILDCARD,
2738                          CAM_LUN_WILDCARD);
2739         xpt_setup_ccb(&cpi.ccb_h, &path, /*priority*/1);
2740         cpi.ccb_h.func_code = XPT_PATH_INQ;
2741         xpt_action((union ccb *)&cpi);
2742         cur_entry->callback(cur_entry->callback_arg,
2743                             AC_PATH_REGISTERED,
2744                             &path, &cpi);
2745         xpt_release_path(&path);
2746
2747         return(1);
2748 }
2749
2750 void
2751 xpt_action(union ccb *start_ccb)
2752 {
2753         CAM_DEBUG(start_ccb->ccb_h.path, CAM_DEBUG_TRACE, ("xpt_action\n"));
2754
2755         start_ccb->ccb_h.status = CAM_REQ_INPROG;
2756
2757         crit_enter();
2758
2759         switch (start_ccb->ccb_h.func_code) {
2760         case XPT_SCSI_IO:
2761         {
2762 #ifdef CAMDEBUG
2763                 char cdb_str[(SCSI_MAX_CDBLEN * 3) + 1];
2764                 struct cam_path *path;
2765
2766                 path = start_ccb->ccb_h.path;
2767 #endif
2768
2769                 /*
2770                  * For the sake of compatibility with SCSI-1
2771                  * devices that may not understand the identify
2772                  * message, we include lun information in the
2773                  * second byte of all commands.  SCSI-1 specifies
2774                  * that luns are a 3 bit value and reserves only 3
2775                  * bits for lun information in the CDB.  Later
2776                  * revisions of the SCSI spec allow for more than 8
2777                  * luns, but have deprecated lun information in the
2778                  * CDB.  So, if the lun won't fit, we must omit.
2779                  *
2780                  * Also be aware that during initial probing for devices,
2781                  * the inquiry information is unknown but initialized to 0.
2782                  * This means that this code will be exercised while probing
2783                  * devices with an ANSI revision greater than 2.
2784                  */
2785                 if (SID_ANSI_REV(&start_ccb->ccb_h.path->device->inq_data) <= 2
2786                  && start_ccb->ccb_h.target_lun < 8
2787                  && (start_ccb->ccb_h.flags & CAM_CDB_POINTER) == 0) {
2788
2789                         start_ccb->csio.cdb_io.cdb_bytes[1] |=
2790                             start_ccb->ccb_h.target_lun << 5;
2791                 }
2792                 start_ccb->csio.scsi_status = SCSI_STATUS_OK;
2793                 CAM_DEBUG(path, CAM_DEBUG_CDB,("%s. CDB: %s\n",
2794                           scsi_op_desc(start_ccb->csio.cdb_io.cdb_bytes[0],
2795                                        &path->device->inq_data),
2796                           scsi_cdb_string(start_ccb->csio.cdb_io.cdb_bytes,
2797                                           cdb_str, sizeof(cdb_str))));
2798                 /* FALLTHROUGH */
2799         }
2800         case XPT_TARGET_IO:
2801         case XPT_CONT_TARGET_IO:
2802                 start_ccb->csio.sense_resid = 0;
2803                 start_ccb->csio.resid = 0;
2804                 /* FALLTHROUGH */
2805         case XPT_RESET_DEV:
2806         case XPT_ENG_EXEC:
2807         {
2808                 struct cam_path *path;
2809                 int runq;
2810
2811                 path = start_ccb->ccb_h.path;
2812
2813                 cam_ccbq_insert_ccb(&path->device->ccbq, start_ccb);
2814                 if (path->device->qfrozen_cnt == 0)
2815                         runq = xpt_schedule_dev_sendq(path->bus, path->device);
2816                 else
2817                         runq = 0;
2818                 if (runq != 0)
2819                         xpt_run_dev_sendq(path->bus);
2820                 break;
2821         }
2822         case XPT_SET_TRAN_SETTINGS:
2823         {
2824                 xpt_set_transfer_settings(&start_ccb->cts,
2825                                           start_ccb->ccb_h.path->device,
2826                                           /*async_update*/FALSE);
2827                 break;
2828         }
2829         case XPT_CALC_GEOMETRY:
2830         {
2831                 struct cam_sim *sim;
2832
2833                 /* Filter out garbage */
2834                 if (start_ccb->ccg.block_size == 0
2835                  || start_ccb->ccg.volume_size == 0) {
2836                         start_ccb->ccg.cylinders = 0;
2837                         start_ccb->ccg.heads = 0;
2838                         start_ccb->ccg.secs_per_track = 0;
2839                         start_ccb->ccb_h.status = CAM_REQ_CMP;
2840                         break;
2841                 }
2842                 sim = start_ccb->ccb_h.path->bus->sim;
2843                 (*(sim->sim_action))(sim, start_ccb);
2844                 break;
2845         }
2846         case XPT_ABORT:
2847         {
2848                 union ccb* abort_ccb;
2849
2850                 abort_ccb = start_ccb->cab.abort_ccb;
2851                 if (XPT_FC_IS_DEV_QUEUED(abort_ccb)) {
2852
2853                         if (abort_ccb->ccb_h.pinfo.index >= 0) {
2854                                 struct cam_ccbq *ccbq;
2855
2856                                 ccbq = &abort_ccb->ccb_h.path->device->ccbq;
2857                                 cam_ccbq_remove_ccb(ccbq, abort_ccb);
2858                                 abort_ccb->ccb_h.status =
2859                                     CAM_REQ_ABORTED|CAM_DEV_QFRZN;
2860                                 xpt_freeze_devq(abort_ccb->ccb_h.path, 1);
2861                                 xpt_done(abort_ccb);
2862                                 start_ccb->ccb_h.status = CAM_REQ_CMP;
2863                                 break;
2864                         }
2865                         if (abort_ccb->ccb_h.pinfo.index == CAM_UNQUEUED_INDEX
2866                          && (abort_ccb->ccb_h.status & CAM_SIM_QUEUED) == 0) {
2867                                 /*
2868                                  * We've caught this ccb en route to
2869                                  * the SIM.  Flag it for abort and the
2870                                  * SIM will do so just before starting
2871                                  * real work on the CCB.
2872                                  */
2873                                 abort_ccb->ccb_h.status =
2874                                     CAM_REQ_ABORTED|CAM_DEV_QFRZN;
2875                                 xpt_freeze_devq(abort_ccb->ccb_h.path, 1);
2876                                 start_ccb->ccb_h.status = CAM_REQ_CMP;
2877                                 break;
2878                         }
2879                 } 
2880                 if (XPT_FC_IS_QUEUED(abort_ccb)
2881                  && (abort_ccb->ccb_h.pinfo.index == CAM_DONEQ_INDEX)) {
2882                         /*
2883                          * It's already completed but waiting
2884                          * for our SWI to get to it.
2885                          */
2886                         start_ccb->ccb_h.status = CAM_UA_ABORT;
2887                         break;
2888                 }
2889                 /*
2890                  * If we weren't able to take care of the abort request
2891                  * in the XPT, pass the request down to the SIM for processing.
2892                  */
2893                 /* FALLTHROUGH */
2894         }
2895         case XPT_ACCEPT_TARGET_IO:
2896         case XPT_EN_LUN:
2897         case XPT_IMMED_NOTIFY:
2898         case XPT_NOTIFY_ACK:
2899         case XPT_GET_TRAN_SETTINGS:
2900         case XPT_RESET_BUS:
2901         {
2902                 struct cam_sim *sim;
2903
2904                 sim = start_ccb->ccb_h.path->bus->sim;
2905                 (*(sim->sim_action))(sim, start_ccb);
2906                 break;
2907         }
2908         case XPT_PATH_INQ:
2909         {
2910                 struct cam_sim *sim;
2911
2912                 sim = start_ccb->ccb_h.path->bus->sim;
2913                 (*(sim->sim_action))(sim, start_ccb);
2914                 break;
2915         }
2916         case XPT_PATH_STATS:
2917                 start_ccb->cpis.last_reset =
2918                         start_ccb->ccb_h.path->bus->last_reset;
2919                 start_ccb->ccb_h.status = CAM_REQ_CMP;
2920                 break;
2921         case XPT_GDEV_TYPE:
2922         {
2923                 struct cam_ed *dev;
2924
2925                 dev = start_ccb->ccb_h.path->device;
2926                 if ((dev->flags & CAM_DEV_UNCONFIGURED) != 0) {
2927                         start_ccb->ccb_h.status = CAM_DEV_NOT_THERE;
2928                 } else {
2929                         struct ccb_getdev *cgd;
2930                         struct cam_eb *bus;
2931                         struct cam_et *tar;
2932
2933                         cgd = &start_ccb->cgd;
2934                         bus = cgd->ccb_h.path->bus;
2935                         tar = cgd->ccb_h.path->target;
2936                         cgd->inq_data = dev->inq_data;
2937                         cgd->ccb_h.status = CAM_REQ_CMP;
2938                         cgd->serial_num_len = dev->serial_num_len;
2939                         if ((dev->serial_num_len > 0)
2940                          && (dev->serial_num != NULL))
2941                                 bcopy(dev->serial_num, cgd->serial_num,
2942                                       dev->serial_num_len);
2943                 }
2944                 break; 
2945         }
2946         case XPT_GDEV_STATS:
2947         {
2948                 struct cam_ed *dev;
2949
2950                 dev = start_ccb->ccb_h.path->device;
2951                 if ((dev->flags & CAM_DEV_UNCONFIGURED) != 0) {
2952                         start_ccb->ccb_h.status = CAM_DEV_NOT_THERE;
2953                 } else {
2954                         struct ccb_getdevstats *cgds;
2955                         struct cam_eb *bus;
2956                         struct cam_et *tar;
2957
2958                         cgds = &start_ccb->cgds;
2959                         bus = cgds->ccb_h.path->bus;
2960                         tar = cgds->ccb_h.path->target;
2961                         cgds->dev_openings = dev->ccbq.dev_openings;
2962                         cgds->dev_active = dev->ccbq.dev_active;
2963                         cgds->devq_openings = dev->ccbq.devq_openings;
2964                         cgds->devq_queued = dev->ccbq.queue.entries;
2965                         cgds->held = dev->ccbq.held;
2966                         cgds->last_reset = tar->last_reset;
2967                         cgds->maxtags = dev->quirk->maxtags;
2968                         cgds->mintags = dev->quirk->mintags;
2969                         if (timevalcmp(&tar->last_reset, &bus->last_reset, <))
2970                                 cgds->last_reset = bus->last_reset;
2971                         cgds->ccb_h.status = CAM_REQ_CMP;
2972                 }
2973                 break;
2974         }
2975         case XPT_GDEVLIST:
2976         {
2977                 struct cam_periph       *nperiph;
2978                 struct periph_list      *periph_head;
2979                 struct ccb_getdevlist   *cgdl;
2980                 int                     i;
2981                 struct cam_ed           *device;
2982                 int                     found;
2983
2984
2985                 found = 0;
2986
2987                 /*
2988                  * Don't want anyone mucking with our data.
2989                  */
2990                 device = start_ccb->ccb_h.path->device;
2991                 periph_head = &device->periphs;
2992                 cgdl = &start_ccb->cgdl;
2993
2994                 /*
2995                  * Check and see if the list has changed since the user
2996                  * last requested a list member.  If so, tell them that the
2997                  * list has changed, and therefore they need to start over 
2998                  * from the beginning.
2999                  */
3000                 if ((cgdl->index != 0) && 
3001                     (cgdl->generation != device->generation)) {
3002                         cgdl->status = CAM_GDEVLIST_LIST_CHANGED;
3003                         break;
3004                 }
3005
3006                 /*
3007                  * Traverse the list of peripherals and attempt to find 
3008                  * the requested peripheral.
3009                  */
3010                 for (nperiph = periph_head->slh_first, i = 0;
3011                      (nperiph != NULL) && (i <= cgdl->index);
3012                      nperiph = nperiph->periph_links.sle_next, i++) {
3013                         if (i == cgdl->index) {
3014                                 strncpy(cgdl->periph_name,
3015                                         nperiph->periph_name,
3016                                         DEV_IDLEN);
3017                                 cgdl->unit_number = nperiph->unit_number;
3018                                 found = 1;
3019                         }
3020                 }
3021                 if (found == 0) {
3022                         cgdl->status = CAM_GDEVLIST_ERROR;
3023                         break;
3024                 }
3025
3026                 if (nperiph == NULL)
3027                         cgdl->status = CAM_GDEVLIST_LAST_DEVICE;
3028                 else
3029                         cgdl->status = CAM_GDEVLIST_MORE_DEVS;
3030
3031                 cgdl->index++;
3032                 cgdl->generation = device->generation;
3033
3034                 cgdl->ccb_h.status = CAM_REQ_CMP;
3035                 break;
3036         }
3037         case XPT_DEV_MATCH:
3038         {
3039                 dev_pos_type position_type;
3040                 struct ccb_dev_match *cdm;
3041                 int ret;
3042
3043                 cdm = &start_ccb->cdm;
3044
3045                 /*
3046                  * Prevent EDT changes while we traverse it.
3047                  */
3048                 /*
3049                  * There are two ways of getting at information in the EDT.
3050                  * The first way is via the primary EDT tree.  It starts
3051                  * with a list of busses, then a list of targets on a bus,
3052                  * then devices/luns on a target, and then peripherals on a
3053                  * device/lun.  The "other" way is by the peripheral driver
3054                  * lists.  The peripheral driver lists are organized by
3055                  * peripheral driver.  (obviously)  So it makes sense to
3056                  * use the peripheral driver list if the user is looking
3057                  * for something like "da1", or all "da" devices.  If the
3058                  * user is looking for something on a particular bus/target
3059                  * or lun, it's generally better to go through the EDT tree.
3060                  */
3061
3062                 if (cdm->pos.position_type != CAM_DEV_POS_NONE)
3063                         position_type = cdm->pos.position_type;
3064                 else {
3065                         int i;
3066
3067                         position_type = CAM_DEV_POS_NONE;
3068
3069                         for (i = 0; i < cdm->num_patterns; i++) {
3070                                 if ((cdm->patterns[i].type == DEV_MATCH_BUS)
3071                                  ||(cdm->patterns[i].type == DEV_MATCH_DEVICE)){
3072                                         position_type = CAM_DEV_POS_EDT;
3073                                         break;
3074                                 }
3075                         }
3076
3077                         if (cdm->num_patterns == 0)
3078                                 position_type = CAM_DEV_POS_EDT;
3079                         else if (position_type == CAM_DEV_POS_NONE)
3080                                 position_type = CAM_DEV_POS_PDRV;
3081                 }
3082
3083                 switch(position_type & CAM_DEV_POS_TYPEMASK) {
3084                 case CAM_DEV_POS_EDT:
3085                         ret = xptedtmatch(cdm);
3086                         break;
3087                 case CAM_DEV_POS_PDRV:
3088                         ret = xptperiphlistmatch(cdm);
3089                         break;
3090                 default:
3091                         cdm->status = CAM_DEV_MATCH_ERROR;
3092                         break;
3093                 }
3094
3095                 if (cdm->status == CAM_DEV_MATCH_ERROR)
3096                         start_ccb->ccb_h.status = CAM_REQ_CMP_ERR;
3097                 else
3098                         start_ccb->ccb_h.status = CAM_REQ_CMP;
3099
3100                 break;
3101         }
3102         case XPT_SASYNC_CB:
3103         {
3104                 struct ccb_setasync *csa;
3105                 struct async_node *cur_entry;
3106                 struct async_list *async_head;
3107                 u_int32_t added;
3108
3109                 csa = &start_ccb->csa;
3110                 added = csa->event_enable;
3111                 async_head = &csa->ccb_h.path->device->asyncs;
3112
3113                 /*
3114                  * If there is already an entry for us, simply
3115                  * update it.
3116                  */
3117                 cur_entry = SLIST_FIRST(async_head);
3118                 while (cur_entry != NULL) {
3119                         if ((cur_entry->callback_arg == csa->callback_arg)
3120                          && (cur_entry->callback == csa->callback))
3121                                 break;
3122                         cur_entry = SLIST_NEXT(cur_entry, links);
3123                 }
3124
3125                 if (cur_entry != NULL) {
3126                         /*
3127                          * If the request has no flags set,
3128                          * remove the entry.
3129                          */
3130                         added &= ~cur_entry->event_enable;
3131                         if (csa->event_enable == 0) {
3132                                 SLIST_REMOVE(async_head, cur_entry,
3133                                              async_node, links);
3134                                 csa->ccb_h.path->device->refcount--;
3135                                 free(cur_entry, M_DEVBUF);
3136                         } else {
3137                                 cur_entry->event_enable = csa->event_enable;
3138                         }
3139                 } else {
3140                         cur_entry = malloc(sizeof(*cur_entry), 
3141                                             M_DEVBUF, M_INTWAIT);
3142                         cur_entry->event_enable = csa->event_enable;
3143                         cur_entry->callback_arg = csa->callback_arg;
3144                         cur_entry->callback = csa->callback;
3145                         SLIST_INSERT_HEAD(async_head, cur_entry, links);
3146                         csa->ccb_h.path->device->refcount++;
3147                 }
3148
3149                 if ((added & AC_FOUND_DEVICE) != 0) {
3150                         /*
3151                          * Get this peripheral up to date with all
3152                          * the currently existing devices.
3153                          */
3154                         xpt_for_all_devices(xptsetasyncfunc, cur_entry);
3155                 }
3156                 if ((added & AC_PATH_REGISTERED) != 0) {
3157                         /*
3158                          * Get this peripheral up to date with all
3159                          * the currently existing busses.
3160                          */
3161                         xpt_for_all_busses(xptsetasyncbusfunc, cur_entry);
3162                 }
3163                 start_ccb->ccb_h.status = CAM_REQ_CMP;
3164                 break;
3165         }
3166         case XPT_REL_SIMQ:
3167         {
3168                 struct ccb_relsim *crs;
3169                 struct cam_ed *dev;
3170
3171                 crs = &start_ccb->crs;
3172                 dev = crs->ccb_h.path->device;
3173                 if (dev == NULL) {
3174
3175                         crs->ccb_h.status = CAM_DEV_NOT_THERE;
3176                         break;
3177                 }
3178
3179                 if ((crs->release_flags & RELSIM_ADJUST_OPENINGS) != 0) {
3180
3181                         if ((dev->inq_data.flags & SID_CmdQue) != 0) {
3182
3183                                 /* Don't ever go below one opening */
3184                                 if (crs->openings > 0) {
3185                                         xpt_dev_ccbq_resize(crs->ccb_h.path,
3186                                                             crs->openings);
3187
3188                                         if (bootverbose) {
3189                                                 xpt_print_path(crs->ccb_h.path);
3190                                                 printf("tagged openings "
3191                                                        "now %d\n",
3192                                                        crs->openings);
3193                                         }
3194                                 }
3195                         }
3196                 }
3197
3198                 if ((crs->release_flags & RELSIM_RELEASE_AFTER_TIMEOUT) != 0) {
3199
3200                         if ((dev->flags & CAM_DEV_REL_TIMEOUT_PENDING) != 0) {
3201
3202                                 /*
3203                                  * Just extend the old timeout and decrement
3204                                  * the freeze count so that a single timeout
3205                                  * is sufficient for releasing the queue.
3206                                  */
3207                                 start_ccb->ccb_h.flags &= ~CAM_DEV_QFREEZE;
3208                                 callout_stop(&dev->c_handle);
3209                         } else {
3210
3211                                 start_ccb->ccb_h.flags |= CAM_DEV_QFREEZE;
3212                         }
3213
3214                         callout_reset(&dev->c_handle,
3215                                       (crs->release_timeout * hz) / 1000, 
3216                                       xpt_release_devq_timeout, dev);
3217
3218                         dev->flags |= CAM_DEV_REL_TIMEOUT_PENDING;
3219
3220                 }
3221
3222                 if ((crs->release_flags & RELSIM_RELEASE_AFTER_CMDCMPLT) != 0) {
3223
3224                         if ((dev->flags & CAM_DEV_REL_ON_COMPLETE) != 0) {
3225                                 /*
3226                                  * Decrement the freeze count so that a single
3227                                  * completion is still sufficient to unfreeze
3228                                  * the queue.
3229                                  */
3230                                 start_ccb->ccb_h.flags &= ~CAM_DEV_QFREEZE;
3231                         } else {
3232                                 
3233                                 dev->flags |= CAM_DEV_REL_ON_COMPLETE;
3234                                 start_ccb->ccb_h.flags |= CAM_DEV_QFREEZE;
3235                         }
3236                 }
3237
3238                 if ((crs->release_flags & RELSIM_RELEASE_AFTER_QEMPTY) != 0) {
3239
3240                         if ((dev->flags & CAM_DEV_REL_ON_QUEUE_EMPTY) != 0
3241                          || (dev->ccbq.dev_active == 0)) {
3242
3243                                 start_ccb->ccb_h.flags &= ~CAM_DEV_QFREEZE;
3244                         } else {
3245                                 
3246                                 dev->flags |= CAM_DEV_REL_ON_QUEUE_EMPTY;
3247                                 start_ccb->ccb_h.flags |= CAM_DEV_QFREEZE;
3248                         }
3249                 }
3250                 
3251                 if ((start_ccb->ccb_h.flags & CAM_DEV_QFREEZE) == 0) {
3252
3253                         xpt_release_devq(crs->ccb_h.path, /*count*/1,
3254                                          /*run_queue*/TRUE);
3255                 }
3256                 start_ccb->crs.qfrozen_cnt = dev->qfrozen_cnt;
3257                 start_ccb->ccb_h.status = CAM_REQ_CMP;
3258                 break;
3259         }
3260         case XPT_SCAN_BUS:
3261                 xpt_scan_bus(start_ccb->ccb_h.path->periph, start_ccb);
3262                 break;
3263         case XPT_SCAN_LUN:
3264                 xpt_scan_lun(start_ccb->ccb_h.path->periph,
3265                              start_ccb->ccb_h.path, start_ccb->crcn.flags,
3266                              start_ccb);
3267                 break;
3268         case XPT_DEBUG: {
3269 #ifdef CAMDEBUG
3270 #ifdef CAM_DEBUG_DELAY
3271                 cam_debug_delay = CAM_DEBUG_DELAY;
3272 #endif
3273                 cam_dflags = start_ccb->cdbg.flags;
3274                 if (cam_dpath != NULL) {
3275                         xpt_free_path(cam_dpath);
3276                         cam_dpath = NULL;
3277                 }
3278
3279                 if (cam_dflags != CAM_DEBUG_NONE) {
3280                         if (xpt_create_path(&cam_dpath, xpt_periph,
3281                                             start_ccb->ccb_h.path_id,
3282                                             start_ccb->ccb_h.target_id,
3283                                             start_ccb->ccb_h.target_lun) !=
3284                                             CAM_REQ_CMP) {
3285                                 start_ccb->ccb_h.status = CAM_RESRC_UNAVAIL;
3286                                 cam_dflags = CAM_DEBUG_NONE;
3287                         } else {
3288                                 start_ccb->ccb_h.status = CAM_REQ_CMP;
3289                                 xpt_print_path(cam_dpath);
3290                                 printf("debugging flags now %x\n", cam_dflags);
3291                         }
3292                 } else {
3293                         cam_dpath = NULL;
3294                         start_ccb->ccb_h.status = CAM_REQ_CMP;
3295                 }
3296 #else /* !CAMDEBUG */
3297                 start_ccb->ccb_h.status = CAM_FUNC_NOTAVAIL;
3298 #endif /* CAMDEBUG */
3299                 break;
3300         }
3301         case XPT_NOOP:
3302                 if ((start_ccb->ccb_h.flags & CAM_DEV_QFREEZE) != 0)
3303                         xpt_freeze_devq(start_ccb->ccb_h.path, 1);
3304                 start_ccb->ccb_h.status = CAM_REQ_CMP;
3305                 break;
3306         default:
3307         case XPT_SDEV_TYPE:
3308         case XPT_TERM_IO:
3309         case XPT_ENG_INQ:
3310                 /* XXX Implement */
3311                 start_ccb->ccb_h.status = CAM_PROVIDE_FAIL;
3312                 break;
3313         }
3314         crit_exit();
3315 }
3316
3317 void
3318 xpt_polled_action(union ccb *start_ccb)
3319 {
3320         u_int32_t timeout;
3321         struct    cam_sim *sim; 
3322         struct    cam_devq *devq;
3323         struct    cam_ed *dev;
3324
3325         timeout = start_ccb->ccb_h.timeout;
3326         sim = start_ccb->ccb_h.path->bus->sim;
3327         devq = sim->devq;
3328         dev = start_ccb->ccb_h.path->device;
3329
3330         crit_enter();
3331
3332         /*
3333          * Steal an opening so that no other queued requests
3334          * can get it before us while we simulate interrupts.
3335          */
3336         dev->ccbq.devq_openings--;
3337         dev->ccbq.dev_openings--;       
3338         
3339         while((devq->send_openings <= 0 || dev->ccbq.dev_openings < 0)
3340            && (--timeout > 0)) {
3341                 DELAY(1000);
3342                 (*(sim->sim_poll))(sim);
3343                 swi_camnet(NULL);
3344                 swi_cambio(NULL);               
3345         }
3346         
3347         dev->ccbq.devq_openings++;
3348         dev->ccbq.dev_openings++;
3349         
3350         if (timeout != 0) {
3351                 xpt_action(start_ccb);
3352                 while(--timeout > 0) {
3353                         (*(sim->sim_poll))(sim);
3354                         swi_camnet(NULL);
3355                         swi_cambio(NULL);
3356                         if ((start_ccb->ccb_h.status  & CAM_STATUS_MASK)
3357                             != CAM_REQ_INPROG)
3358                                 break;
3359                         DELAY(1000);
3360                 }
3361                 if (timeout == 0) {
3362                         /*
3363                          * XXX Is it worth adding a sim_timeout entry
3364                          * point so we can attempt recovery?  If
3365                          * this is only used for dumps, I don't think
3366                          * it is.
3367                          */
3368                         start_ccb->ccb_h.status = CAM_CMD_TIMEOUT;
3369                 }
3370         } else {
3371                 start_ccb->ccb_h.status = CAM_RESRC_UNAVAIL;
3372         }
3373         crit_exit();
3374 }
3375         
3376 /*
3377  * Schedule a peripheral driver to receive a ccb when it's
3378  * target device has space for more transactions.
3379  */
3380 void
3381 xpt_schedule(struct cam_periph *perph, u_int32_t new_priority)
3382 {
3383         struct cam_ed *device;
3384         int runq;
3385
3386         CAM_DEBUG(perph->path, CAM_DEBUG_TRACE, ("xpt_schedule\n"));
3387         device = perph->path->device;
3388         crit_enter();
3389         if (periph_is_queued(perph)) {
3390                 /* Simply reorder based on new priority */
3391                 CAM_DEBUG(perph->path, CAM_DEBUG_SUBTRACE,
3392                           ("   change priority to %d\n", new_priority));
3393                 if (new_priority < perph->pinfo.priority) {
3394                         camq_change_priority(&device->drvq,
3395                                              perph->pinfo.index,
3396                                              new_priority);
3397                 }
3398                 runq = 0;
3399         } else {
3400                 /* New entry on the queue */
3401                 CAM_DEBUG(perph->path, CAM_DEBUG_SUBTRACE,
3402                           ("   added periph to queue\n"));
3403                 perph->pinfo.priority = new_priority;
3404                 perph->pinfo.generation = ++device->drvq.generation;
3405                 camq_insert(&device->drvq, &perph->pinfo);
3406                 runq = xpt_schedule_dev_allocq(perph->path->bus, device);
3407         }
3408         crit_exit();
3409         if (runq != 0) {
3410                 CAM_DEBUG(perph->path, CAM_DEBUG_SUBTRACE,
3411                           ("   calling xpt_run_devq\n"));
3412                 xpt_run_dev_allocq(perph->path->bus);
3413         }
3414 }
3415
3416
3417 /*
3418  * Schedule a device to run on a given queue.
3419  * If the device was inserted as a new entry on the queue,
3420  * return 1 meaning the device queue should be run. If we
3421  * were already queued, implying someone else has already
3422  * started the queue, return 0 so the caller doesn't attempt
3423  * to run the queue.  Must be run in a critical section.
3424  */
3425 static int
3426 xpt_schedule_dev(struct camq *queue, cam_pinfo *pinfo,
3427                  u_int32_t new_priority)
3428 {
3429         int retval;
3430         u_int32_t old_priority;
3431
3432         CAM_DEBUG_PRINT(CAM_DEBUG_XPT, ("xpt_schedule_dev\n"));
3433
3434         old_priority = pinfo->priority;
3435
3436         /*
3437          * Are we already queued?
3438          */
3439         if (pinfo->index != CAM_UNQUEUED_INDEX) {
3440                 /* Simply reorder based on new priority */
3441                 if (new_priority < old_priority) {
3442                         camq_change_priority(queue, pinfo->index,
3443                                              new_priority);
3444                         CAM_DEBUG_PRINT(CAM_DEBUG_XPT,
3445                                         ("changed priority to %d\n",
3446                                          new_priority));
3447                 }
3448                 retval = 0;
3449         } else {
3450                 /* New entry on the queue */
3451                 if (new_priority < old_priority)
3452                         pinfo->priority = new_priority;
3453
3454                 CAM_DEBUG_PRINT(CAM_DEBUG_XPT,
3455                                 ("Inserting onto queue\n"));
3456                 pinfo->generation = ++queue->generation;
3457                 camq_insert(queue, pinfo);
3458                 retval = 1;
3459         }
3460         return (retval);
3461 }
3462
3463 static void
3464 xpt_run_dev_allocq(struct cam_eb *bus)
3465 {
3466         struct  cam_devq *devq;
3467
3468         CAM_DEBUG_PRINT(CAM_DEBUG_XPT, ("xpt_run_dev_allocq\n"));
3469         devq = bus->sim->devq;
3470
3471         CAM_DEBUG_PRINT(CAM_DEBUG_XPT,
3472                         ("   qfrozen_cnt == 0x%x, entries == %d, "
3473                          "openings == %d, active == %d\n",
3474                          devq->alloc_queue.qfrozen_cnt,
3475                          devq->alloc_queue.entries,
3476                          devq->alloc_openings,
3477                          devq->alloc_active));
3478
3479         crit_enter();
3480         devq->alloc_queue.qfrozen_cnt++;
3481         while ((devq->alloc_queue.entries > 0)
3482             && (devq->alloc_openings > 0)
3483             && (devq->alloc_queue.qfrozen_cnt <= 1)) {
3484                 struct  cam_ed_qinfo *qinfo;
3485                 struct  cam_ed *device;
3486                 union   ccb *work_ccb;
3487                 struct  cam_periph *drv;
3488                 struct  camq *drvq;
3489                 
3490                 qinfo = (struct cam_ed_qinfo *)camq_remove(&devq->alloc_queue,
3491                                                            CAMQ_HEAD);
3492                 device = qinfo->device;
3493
3494                 CAM_DEBUG_PRINT(CAM_DEBUG_XPT,
3495                                 ("running device %p\n", device));
3496
3497                 drvq = &device->drvq;
3498
3499 #ifdef CAMDEBUG
3500                 if (drvq->entries <= 0) {
3501                         panic("xpt_run_dev_allocq: "
3502                               "Device on queue without any work to do");
3503                 }
3504 #endif
3505                 if ((work_ccb = xpt_get_ccb(device)) != NULL) {
3506                         devq->alloc_openings--;
3507                         devq->alloc_active++;
3508                         drv = (struct cam_periph*)camq_remove(drvq, CAMQ_HEAD);
3509                         crit_exit();
3510                         xpt_setup_ccb(&work_ccb->ccb_h, drv->path,
3511                                       drv->pinfo.priority);
3512                         CAM_DEBUG_PRINT(CAM_DEBUG_XPT,
3513                                         ("calling periph start\n"));
3514                         drv->periph_start(drv, work_ccb);
3515                 } else {
3516                         /*
3517                          * Malloc failure in alloc_ccb
3518                          */
3519                         /*
3520                          * XXX add us to a list to be run from free_ccb
3521                          * if we don't have any ccbs active on this
3522                          * device queue otherwise we may never get run
3523                          * again.
3524                          */
3525                         break;
3526                 }
3527         
3528                 /* Raise IPL for possible insertion and test at top of loop */
3529                 crit_enter();
3530
3531                 if (drvq->entries > 0) {
3532                         /* We have more work.  Attempt to reschedule */
3533                         xpt_schedule_dev_allocq(bus, device);
3534                 }
3535         }
3536         devq->alloc_queue.qfrozen_cnt--;
3537         crit_exit();
3538 }
3539
3540 static void
3541 xpt_run_dev_sendq(struct cam_eb *bus)
3542 {
3543         struct  cam_devq *devq;
3544
3545         CAM_DEBUG_PRINT(CAM_DEBUG_XPT, ("xpt_run_dev_sendq\n"));
3546         
3547         devq = bus->sim->devq;
3548
3549         crit_enter();
3550         devq->send_queue.qfrozen_cnt++;
3551         while ((devq->send_queue.entries > 0)
3552             && (devq->send_openings > 0)) {
3553                 struct  cam_ed_qinfo *qinfo;
3554                 struct  cam_ed *device;
3555                 union ccb *work_ccb;
3556                 struct  cam_sim *sim;
3557
3558                 if (devq->send_queue.qfrozen_cnt > 1) {
3559                         break;
3560                 }
3561
3562                 qinfo = (struct cam_ed_qinfo *)camq_remove(&devq->send_queue,
3563                                                            CAMQ_HEAD);
3564                 device = qinfo->device;
3565
3566                 /*
3567                  * If the device has been "frozen", don't attempt
3568                  * to run it.
3569                  */
3570                 if (device->qfrozen_cnt > 0) {
3571                         continue;
3572                 }
3573
3574                 CAM_DEBUG_PRINT(CAM_DEBUG_XPT,
3575                                 ("running device %p\n", device));
3576
3577                 work_ccb = cam_ccbq_peek_ccb(&device->ccbq, CAMQ_HEAD);
3578                 if (work_ccb == NULL) {
3579                         printf("device on run queue with no ccbs???\n");
3580                         continue;
3581                 }
3582
3583                 if ((work_ccb->ccb_h.flags & CAM_HIGH_POWER) != 0) {
3584
3585                         if (num_highpower <= 0) {
3586                                 /*
3587                                  * We got a high power command, but we
3588                                  * don't have any available slots.  Freeze
3589                                  * the device queue until we have a slot
3590                                  * available.
3591                                  */
3592                                 device->qfrozen_cnt++;
3593                                 STAILQ_INSERT_TAIL(&highpowerq, 
3594                                                    &work_ccb->ccb_h, 
3595                                                    xpt_links.stqe);
3596
3597                                 continue;
3598                         } else {
3599                                 /*
3600                                  * Consume a high power slot while
3601                                  * this ccb runs.
3602                                  */
3603                                 num_highpower--;
3604                         }
3605                 }
3606                 devq->active_dev = device;
3607                 cam_ccbq_remove_ccb(&device->ccbq, work_ccb);
3608
3609                 cam_ccbq_send_ccb(&device->ccbq, work_ccb);
3610
3611                 devq->send_openings--;
3612                 devq->send_active++;            
3613                 
3614                 if (device->ccbq.queue.entries > 0)
3615                         xpt_schedule_dev_sendq(bus, device);
3616
3617                 if (work_ccb && (work_ccb->ccb_h.flags & CAM_DEV_QFREEZE) != 0){
3618                         /*
3619                          * The client wants to freeze the queue
3620                          * after this CCB is sent.
3621                          */
3622                         device->qfrozen_cnt++;
3623                 }
3624
3625                 /* In Target mode, the peripheral driver knows best... */
3626                 if (work_ccb->ccb_h.func_code == XPT_SCSI_IO) {
3627                         if ((device->inq_flags & SID_CmdQue) != 0
3628                          && work_ccb->csio.tag_action != CAM_TAG_ACTION_NONE)
3629                                 work_ccb->ccb_h.flags |= CAM_TAG_ACTION_VALID;
3630                         else
3631                                 /*
3632                                  * Clear this in case of a retried CCB that
3633                                  * failed due to a rejected tag.
3634                                  */
3635                                 work_ccb->ccb_h.flags &= ~CAM_TAG_ACTION_VALID;
3636                 }
3637
3638                 /*
3639                  * Device queues can be shared among multiple sim instances
3640                  * that reside on different busses.  Use the SIM in the queue
3641                  * CCB's path, rather than the one in the bus that was passed
3642                  * into this function.
3643                  */
3644                 sim = work_ccb->ccb_h.path->bus->sim;
3645                 (*(sim->sim_action))(sim, work_ccb);
3646
3647                 devq->active_dev = NULL;
3648                 /* Raise IPL for possible insertion and test at top of loop */
3649         }
3650         devq->send_queue.qfrozen_cnt--;
3651         crit_exit();
3652 }
3653
3654 /*
3655  * This function merges stuff from the slave ccb into the master ccb, while
3656  * keeping important fields in the master ccb constant.
3657  */
3658 void
3659 xpt_merge_ccb(union ccb *master_ccb, union ccb *slave_ccb)
3660 {
3661         /*
3662          * Pull fields that are valid for peripheral drivers to set
3663          * into the master CCB along with the CCB "payload".
3664          */
3665         master_ccb->ccb_h.retry_count = slave_ccb->ccb_h.retry_count;
3666         master_ccb->ccb_h.func_code = slave_ccb->ccb_h.func_code;
3667         master_ccb->ccb_h.timeout = slave_ccb->ccb_h.timeout;
3668         master_ccb->ccb_h.flags = slave_ccb->ccb_h.flags;
3669         bcopy(&(&slave_ccb->ccb_h)[1], &(&master_ccb->ccb_h)[1],
3670               sizeof(union ccb) - sizeof(struct ccb_hdr));
3671 }
3672
3673 void
3674 xpt_setup_ccb(struct ccb_hdr *ccb_h, struct cam_path *path, u_int32_t priority)
3675 {
3676         CAM_DEBUG(path, CAM_DEBUG_TRACE, ("xpt_setup_ccb\n"));
3677         callout_init(&ccb_h->timeout_ch);
3678         ccb_h->pinfo.priority = priority;
3679         ccb_h->path = path;
3680         ccb_h->path_id = path->bus->path_id;
3681         if (path->target)
3682                 ccb_h->target_id = path->target->target_id;
3683         else
3684                 ccb_h->target_id = CAM_TARGET_WILDCARD;
3685         if (path->device) {
3686                 ccb_h->target_lun = path->device->lun_id;
3687                 ccb_h->pinfo.generation = ++path->device->ccbq.queue.generation;
3688         } else {
3689                 ccb_h->target_lun = CAM_TARGET_WILDCARD;
3690         }
3691         ccb_h->pinfo.index = CAM_UNQUEUED_INDEX;
3692         ccb_h->flags = 0;
3693 }
3694
3695 /* Path manipulation functions */
3696 cam_status
3697 xpt_create_path(struct cam_path **new_path_ptr, struct cam_periph *perph,
3698                 path_id_t path_id, target_id_t target_id, lun_id_t lun_id)
3699 {
3700         struct     cam_path *path;
3701         cam_status status;
3702
3703         path = malloc(sizeof(*path), M_DEVBUF, M_INTWAIT);
3704         status = xpt_compile_path(path, perph, path_id, target_id, lun_id);
3705         if (status != CAM_REQ_CMP) {
3706                 free(path, M_DEVBUF);
3707                 path = NULL;
3708         }
3709         *new_path_ptr = path;
3710         return (status);
3711 }
3712
3713 static cam_status
3714 xpt_compile_path(struct cam_path *new_path, struct cam_periph *perph,
3715                  path_id_t path_id, target_id_t target_id, lun_id_t lun_id)
3716 {
3717         struct       cam_eb *bus;
3718         struct       cam_et *target;
3719         struct       cam_ed *device;
3720         cam_status   status;
3721
3722         status = CAM_REQ_CMP;   /* Completed without error */
3723         target = NULL;          /* Wildcarded */
3724         device = NULL;          /* Wildcarded */
3725
3726         /*
3727          * We will potentially modify the EDT, so block interrupts
3728          * that may attempt to create cam paths.
3729          */
3730         crit_enter();
3731         bus = xpt_find_bus(path_id);
3732         if (bus == NULL) {
3733                 status = CAM_PATH_INVALID;
3734         } else {
3735                 target = xpt_find_target(bus, target_id);
3736                 if (target == NULL) {
3737                         /* Create one */
3738                         struct cam_et *new_target;
3739
3740                         new_target = xpt_alloc_target(bus, target_id);
3741                         if (new_target == NULL) {
3742                                 status = CAM_RESRC_UNAVAIL;
3743                         } else {
3744                                 target = new_target;
3745                         }
3746                 }
3747                 if (target != NULL) {
3748                         device = xpt_find_device(target, lun_id);
3749                         if (device == NULL) {
3750                                 /* Create one */
3751                                 struct cam_ed *new_device;
3752
3753                                 new_device = xpt_alloc_device(bus,
3754                                                               target,
3755                                                               lun_id);
3756                                 if (new_device == NULL) {
3757                                         status = CAM_RESRC_UNAVAIL;
3758                                 } else {
3759                                         device = new_device;
3760                                 }
3761                         }
3762                 }
3763         }
3764         crit_exit();
3765
3766         /*
3767          * Only touch the user's data if we are successful.
3768          */
3769         if (status == CAM_REQ_CMP) {
3770                 new_path->periph = perph;
3771                 new_path->bus = bus;
3772                 new_path->target = target;
3773                 new_path->device = device;
3774                 CAM_DEBUG(new_path, CAM_DEBUG_TRACE, ("xpt_compile_path\n"));
3775         } else {
3776                 if (device != NULL)
3777                         xpt_release_device(bus, target, device);
3778                 if (target != NULL)
3779                         xpt_release_target(bus, target);
3780                 if (bus != NULL)
3781                         xpt_release_bus(bus);
3782         }
3783         return (status);
3784 }
3785
3786 static void
3787 xpt_release_path(struct cam_path *path)
3788 {
3789         CAM_DEBUG(path, CAM_DEBUG_TRACE, ("xpt_release_path\n"));
3790         if (path->device != NULL) {
3791                 xpt_release_device(path->bus, path->target, path->device);
3792                 path->device = NULL;
3793         }
3794         if (path->target != NULL) {
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