817ab20c1dbf8fb8d0259124a4c2306609e50207
[dragonfly.git] / sys / bus / cam / scsi / scsi_sa.c
1 /*
2  * $FreeBSD: src/sys/cam/scsi/scsi_sa.c,v 1.45.2.13 2002/12/17 17:08:50 trhodes Exp $
3  * $DragonFly: src/sys/bus/cam/scsi/scsi_sa.c,v 1.13 2005/06/02 20:40:31 dillon Exp $
4  *
5  * Implementation of SCSI Sequential Access Peripheral driver for CAM.
6  *
7  * Copyright (c) 1999, 2000 Matthew Jacob
8  * All rights reserved.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions
12  * are met:
13  * 1. Redistributions of source code must retain the above copyright
14  *    notice, this list of conditions, and the following disclaimer,
15  *    without modification, immediately at the beginning of the file.
16  * 2. The name of the author may not be used to endorse or promote products
17  *    derived from this software without specific prior written permission.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
23  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29  * SUCH DAMAGE.
30  *
31  */
32
33 #include <sys/param.h>
34 #include <sys/queue.h>
35 #ifdef _KERNEL
36 #include <sys/systm.h>
37 #include <sys/kernel.h>
38 #endif
39 #include <sys/types.h>
40 #ifdef _KERNEL
41 #include <sys/buf.h>
42 #include <sys/malloc.h>
43 #endif
44 #include <sys/mtio.h>
45 #include <sys/conf.h>
46 #ifdef _KERNEL
47 #include <sys/proc.h>
48 #include <sys/buf2.h>
49 #include <sys/thread2.h>
50 #endif
51 #include <sys/devicestat.h>
52 #include <machine/limits.h>
53
54 #ifndef _KERNEL
55 #include <stdio.h>
56 #include <string.h>
57 #endif
58
59 #include "../cam.h"
60 #include "../cam_ccb.h"
61 #include "../cam_extend.h"
62 #include "../cam_periph.h"
63 #include "../cam_xpt_periph.h"
64 #include "../cam_debug.h"
65
66 #include "scsi_all.h"
67 #include "scsi_message.h"
68 #include "scsi_sa.h"
69
70 #ifdef _KERNEL
71
72 #include <opt_sa.h>
73
74 #ifndef SA_IO_TIMEOUT
75 #define SA_IO_TIMEOUT           4
76 #endif
77 #ifndef SA_SPACE_TIMEOUT
78 #define SA_SPACE_TIMEOUT        1 * 60
79 #endif
80 #ifndef SA_REWIND_TIMEOUT
81 #define SA_REWIND_TIMEOUT       2 * 60
82 #endif
83 #ifndef SA_ERASE_TIMEOUT
84 #define SA_ERASE_TIMEOUT        4 * 60
85 #endif
86
87 #define SCSIOP_TIMEOUT          (60 * 1000)     /* not an option */
88
89 #define IO_TIMEOUT              (SA_IO_TIMEOUT * 60 * 1000)
90 #define REWIND_TIMEOUT          (SA_REWIND_TIMEOUT * 60 * 1000)
91 #define ERASE_TIMEOUT           (SA_ERASE_TIMEOUT * 60 * 1000)
92 #define SPACE_TIMEOUT           (SA_SPACE_TIMEOUT * 60 * 1000)
93
94 /*
95  * Additional options that can be set for config: SA_1FM_AT_EOT
96  */
97
98 #ifndef UNUSED_PARAMETER
99 #define UNUSED_PARAMETER(x)     x = x
100 #endif
101
102 #define QFRLS(ccb)      \
103         if (((ccb)->ccb_h.status & CAM_DEV_QFRZN) != 0) \
104                 cam_release_devq((ccb)->ccb_h.path, 0, 0, 0, FALSE)
105
106 /*
107  * Driver states
108  */
109
110
111 typedef enum {
112         SA_STATE_NORMAL, SA_STATE_ABNORMAL
113 } sa_state;
114
115 #define ccb_pflags      ppriv_field0
116 #define ccb_bp          ppriv_ptr1
117
118 #define SA_CCB_BUFFER_IO        0x0
119 #define SA_CCB_WAITING          0x1
120 #define SA_CCB_TYPEMASK         0x1
121 #define SA_POSITION_UPDATED     0x2
122
123 #define Set_CCB_Type(x, type)                           \
124         x->ccb_h.ccb_pflags &= ~SA_CCB_TYPEMASK;        \
125         x->ccb_h.ccb_pflags |= type
126
127 #define CCB_Type(x)     (x->ccb_h.ccb_pflags & SA_CCB_TYPEMASK)
128
129
130
131 typedef enum {
132         SA_FLAG_OPEN            = 0x0001,
133         SA_FLAG_FIXED           = 0x0002,
134         SA_FLAG_TAPE_LOCKED     = 0x0004,
135         SA_FLAG_TAPE_MOUNTED    = 0x0008,
136         SA_FLAG_TAPE_WP         = 0x0010,
137         SA_FLAG_TAPE_WRITTEN    = 0x0020,
138         SA_FLAG_EOM_PENDING     = 0x0040,
139         SA_FLAG_EIO_PENDING     = 0x0080,
140         SA_FLAG_EOF_PENDING     = 0x0100,
141         SA_FLAG_ERR_PENDING     = (SA_FLAG_EOM_PENDING|SA_FLAG_EIO_PENDING|
142                                    SA_FLAG_EOF_PENDING),
143         SA_FLAG_INVALID         = 0x0200,
144         SA_FLAG_COMP_ENABLED    = 0x0400,
145         SA_FLAG_COMP_SUPP       = 0x0800,
146         SA_FLAG_COMP_UNSUPP     = 0x1000,
147         SA_FLAG_TAPE_FROZEN     = 0x2000
148 } sa_flags;
149
150 typedef enum {
151         SA_MODE_REWIND          = 0x00,
152         SA_MODE_NOREWIND        = 0x01,
153         SA_MODE_OFFLINE         = 0x02
154 } sa_mode;
155
156 typedef enum {
157         SA_PARAM_NONE           = 0x00,
158         SA_PARAM_BLOCKSIZE      = 0x01,
159         SA_PARAM_DENSITY        = 0x02,
160         SA_PARAM_COMPRESSION    = 0x04,
161         SA_PARAM_BUFF_MODE      = 0x08,
162         SA_PARAM_NUMBLOCKS      = 0x10,
163         SA_PARAM_WP             = 0x20,
164         SA_PARAM_SPEED          = 0x40,
165         SA_PARAM_ALL            = 0x7f
166 } sa_params;
167
168 typedef enum {
169         SA_QUIRK_NONE           = 0x00,
170         SA_QUIRK_NOCOMP         = 0x01, /* Can't deal with compression at all */
171         SA_QUIRK_FIXED          = 0x02, /* Force fixed mode */
172         SA_QUIRK_VARIABLE       = 0x04, /* Force variable mode */
173         SA_QUIRK_2FM            = 0x08, /* Needs Two File Marks at EOD */
174         SA_QUIRK_1FM            = 0x10, /* No more than 1 File Mark at EOD */
175         SA_QUIRK_NODREAD        = 0x20, /* Don't try and dummy read density */
176         SA_QUIRK_NO_MODESEL     = 0x40, /* Don't do mode select at all */
177         SA_QUIRK_NO_CPAGE       = 0x80  /* Don't use DEVICE COMPRESSION page */
178 } sa_quirks;
179
180 /* units are bits 4-7, 16-21 (1024 units) */
181 #define SAUNIT(DEV) \
182         (((minor(DEV) & 0xF0) >> 4) |  ((minor(DEV) & 0x3f0000) >> 16))
183
184 #define SAMODE(z) ((minor(z) & 0x3))
185 #define SADENSITY(z) (((minor(z) >> 2) & 0x3))
186 #define SA_IS_CTRL(z) (minor(z) & (1 << 29))
187
188 #define SA_NOT_CTLDEV   0
189 #define SA_CTLDEV       1
190
191 #define SA_ATYPE_R      0
192 #define SA_ATYPE_NR     1
193 #define SA_ATYPE_ER     2
194
195 #define SAMINOR(ctl, unit, mode, access) \
196         ((ctl << 29) | ((unit & 0x3f0) << 16) | ((unit & 0xf) << 4) | \
197         (mode << 0x2) | (access & 0x3))
198
199 #define SA_UNITMASK     SAMINOR(0, -1, 0, 0)
200 #define SA_UNIT(unit)   SAMINOR(0, unit, 0, 0)
201
202 #define SA_NUM_MODES    4
203
204 struct sa_softc {
205         sa_state        state;
206         sa_flags        flags;
207         sa_quirks       quirks;
208         struct          buf_queue_head buf_queue;
209         int             queue_count;
210         struct          devstat device_stats;
211         int             blk_gran;
212         int             blk_mask;
213         int             blk_shift;
214         u_int32_t       max_blk;
215         u_int32_t       min_blk;
216         u_int32_t       comp_algorithm;
217         u_int32_t       saved_comp_algorithm;
218         u_int32_t       media_blksize;
219         u_int32_t       last_media_blksize;
220         u_int32_t       media_numblks;
221         u_int8_t        media_density;
222         u_int8_t        speed;
223         u_int8_t        scsi_rev;
224         u_int8_t        dsreg;          /* mtio mt_dsreg, redux */
225         int             buffer_mode;
226         int             filemarks;
227         union           ccb saved_ccb;
228         int             last_resid_was_io;
229
230         /*
231          * Relative to BOT Location.
232          */
233         daddr_t         fileno;
234         daddr_t         blkno;
235
236         /*
237          * Latched Error Info
238          */
239         struct {
240                 struct scsi_sense_data _last_io_sense;
241                 u_int32_t _last_io_resid;
242                 u_int8_t _last_io_cdb[CAM_MAX_CDBLEN];
243                 struct scsi_sense_data _last_ctl_sense;
244                 u_int32_t _last_ctl_resid;
245                 u_int8_t _last_ctl_cdb[CAM_MAX_CDBLEN];
246 #define last_io_sense   errinfo._last_io_sense
247 #define last_io_resid   errinfo._last_io_resid
248 #define last_io_cdb     errinfo._last_io_cdb
249 #define last_ctl_sense  errinfo._last_ctl_sense
250 #define last_ctl_resid  errinfo._last_ctl_resid
251 #define last_ctl_cdb    errinfo._last_ctl_cdb
252         } errinfo;
253         /*
254          * Misc other flags/state
255          */
256         u_int32_t
257                                 : 31,
258                 ctrl_mode       : 1;    /* control device open */
259 };
260
261 struct sa_quirk_entry {
262         struct scsi_inquiry_pattern inq_pat;    /* matching pattern */
263         sa_quirks quirks;       /* specific quirk type */
264         u_int32_t prefblk;      /* preferred blocksize when in fixed mode */
265 };
266
267 static struct sa_quirk_entry sa_quirk_table[] =
268 {
269         {
270                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "OnStream",
271                   "ADR*", "*"}, SA_QUIRK_FIXED|SA_QUIRK_NODREAD |
272                    SA_QUIRK_1FM|SA_QUIRK_NO_MODESEL, 32768
273         },
274         {
275                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "ARCHIVE",
276                   "Python 06408*", "*"}, SA_QUIRK_NODREAD, 0
277         },
278         {
279                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "ARCHIVE",
280                   "Python 25601*", "*"}, SA_QUIRK_NOCOMP|SA_QUIRK_NODREAD, 0
281         },
282         {
283                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "ARCHIVE",
284                   "Python*", "*"}, SA_QUIRK_NODREAD, 0
285         },
286         {
287                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "ARCHIVE",
288                   "VIPER 150*", "*"}, SA_QUIRK_FIXED|SA_QUIRK_1FM, 512
289         },
290         {
291                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "ARCHIVE",
292                   "VIPER 2525 25462", "-011"},
293                   SA_QUIRK_NOCOMP|SA_QUIRK_1FM|SA_QUIRK_NODREAD, 0
294         },
295         {
296                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "ARCHIVE",
297                   "VIPER 2525*", "*"}, SA_QUIRK_FIXED|SA_QUIRK_1FM, 1024
298         },
299 #if     0
300         {
301                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "HP",
302                   "C15*", "*"}, SA_QUIRK_VARIABLE|SA_QUIRK_NO_CPAGE, 0,
303         },
304 #endif
305         {
306                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "HP",
307                   "C56*", "*"}, SA_QUIRK_VARIABLE|SA_QUIRK_2FM, 0
308         },
309         {
310                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "HP",
311                   "T20*", "*"}, SA_QUIRK_FIXED|SA_QUIRK_1FM, 512
312         },
313         {
314                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "HP",
315                   "T4000*", "*"}, SA_QUIRK_FIXED|SA_QUIRK_1FM, 512
316         },
317         {
318                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "HP",
319                   "HP-88780*", "*"}, SA_QUIRK_VARIABLE|SA_QUIRK_2FM, 0
320         },
321         {
322                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "KENNEDY",
323                   "*", "*"}, SA_QUIRK_VARIABLE|SA_QUIRK_2FM, 0
324         },
325         {
326                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "M4 DATA",
327                   "123107 SCSI*", "*"}, SA_QUIRK_VARIABLE|SA_QUIRK_2FM, 0
328         },
329         {       /* jreynold@primenet.com */
330                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "Seagate",
331                 "STT8000N*", "*"}, SA_QUIRK_1FM, 0
332         },
333         {       /* mike@sentex.net */
334                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "Seagate",
335                 "STT20000*", "*"}, SA_QUIRK_1FM, 0
336         },
337         {
338                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "TANDBERG",
339                   " TDC 3600", "U07:"}, SA_QUIRK_NOCOMP|SA_QUIRK_1FM, 512
340         },
341         {
342                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "TANDBERG",
343                   " TDC 3800", "*"}, SA_QUIRK_NOCOMP|SA_QUIRK_1FM, 512
344         },
345         {
346                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "TANDBERG",
347                   " TDC 4100", "*"}, SA_QUIRK_NOCOMP|SA_QUIRK_1FM, 512
348         },
349         {
350                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "TANDBERG",
351                   " TDC 4200", "*"}, SA_QUIRK_NOCOMP|SA_QUIRK_1FM, 512
352         },
353         {
354                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "TANDBERG",
355                   " SLR*", "*"}, SA_QUIRK_1FM, 0
356         },
357         {
358                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "WANGTEK",
359                   "5525ES*", "*"}, SA_QUIRK_FIXED|SA_QUIRK_1FM, 512
360         },
361         {
362                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "WANGTEK",
363                   "51000*", "*"}, SA_QUIRK_FIXED|SA_QUIRK_1FM, 1024
364         }
365 };
366
367 static  d_open_t        saopen;
368 static  d_close_t       saclose;
369 static  d_strategy_t    sastrategy;
370 static  d_ioctl_t       saioctl;
371 static  periph_init_t   sainit;
372 static  periph_ctor_t   saregister;
373 static  periph_oninv_t  saoninvalidate;
374 static  periph_dtor_t   sacleanup;
375 static  periph_start_t  sastart;
376 static  void            saasync(void *callback_arg, u_int32_t code,
377                                 struct cam_path *path, void *arg);
378 static  void            sadone(struct cam_periph *periph,
379                                union ccb *start_ccb);
380 static  int             saerror(union ccb *ccb, u_int32_t cam_flags,
381                                 u_int32_t sense_flags);
382 static int              samarkswanted(struct cam_periph *);
383 static int              sacheckeod(struct cam_periph *periph);
384 static int              sagetparams(struct cam_periph *periph,
385                                     sa_params params_to_get,
386                                     u_int32_t *blocksize, u_int8_t *density,
387                                     u_int32_t *numblocks, int *buff_mode,
388                                     u_int8_t *write_protect, u_int8_t *speed,
389                                     int *comp_supported, int *comp_enabled,
390                                     u_int32_t *comp_algorithm,
391                                     sa_comp_t *comp_page);
392 static int              sasetparams(struct cam_periph *periph,
393                                     sa_params params_to_set,
394                                     u_int32_t blocksize, u_int8_t density,
395                                     u_int32_t comp_algorithm,
396                                     u_int32_t sense_flags);
397 static void             saprevent(struct cam_periph *periph, int action);
398 static int              sarewind(struct cam_periph *periph);
399 static int              saspace(struct cam_periph *periph, int count,
400                                 scsi_space_code code);
401 static int              samount(struct cam_periph *, int, dev_t);
402 static int              saretension(struct cam_periph *periph);
403 static int              sareservereleaseunit(struct cam_periph *periph,
404                                              int reserve);
405 static int              saloadunload(struct cam_periph *periph, int load);
406 static int              saerase(struct cam_periph *periph, int longerase);
407 static int              sawritefilemarks(struct cam_periph *periph,
408                                          int nmarks, int setmarks);
409 static int              sardpos(struct cam_periph *periph, int, u_int32_t *);
410 static int              sasetpos(struct cam_periph *periph, int, u_int32_t *);
411
412
413 static struct periph_driver sadriver =
414 {
415         sainit, "sa",
416         TAILQ_HEAD_INITIALIZER(sadriver.units), /* generation */ 0
417 };
418
419 DATA_SET(periphdriver_set, sadriver);
420
421 /* For 2.2-stable support */
422 #ifndef D_TAPE
423 #define D_TAPE 0
424 #endif
425
426 #define SA_CDEV_MAJOR 14
427
428 static struct cdevsw sa_cdevsw = {
429         /* name */      "sa",
430         /* maj */       SA_CDEV_MAJOR,
431         /* flags */     D_TAPE,
432         /* port */      NULL,
433         /* clone */     NULL,
434
435         /* open */      saopen,
436         /* close */     saclose,
437         /* read */      physread,
438         /* write */     physwrite,
439         /* ioctl */     saioctl,
440         /* poll */      nopoll,
441         /* mmap */      nommap,
442         /* strategy */  sastrategy,
443         /* dump */      nodump,
444         /* psize */     nopsize
445 };
446
447 static struct extend_array *saperiphs;
448
449 static int
450 saopen(dev_t dev, int flags, int fmt, struct thread *td)
451 {
452         struct cam_periph *periph;
453         struct sa_softc *softc;
454         int unit;
455         int mode;
456         int density;
457         int error;
458
459         unit = SAUNIT(dev);
460         mode = SAMODE(dev);
461         density = SADENSITY(dev);
462
463         crit_enter();
464         periph = cam_extend_get(saperiphs, unit);
465         if (periph == NULL) {
466                 crit_exit();
467                 return (ENXIO); 
468         }
469         softc = (struct sa_softc *)periph->softc;
470         if ((error = cam_periph_lock(periph, PCATCH)) != 0) {
471                 crit_exit();
472                 return (error);
473         }
474         crit_exit();
475
476         CAM_DEBUG(periph->path, CAM_DEBUG_TRACE|CAM_DEBUG_INFO,
477             ("saopen(%d): dev=0x%x softc=0x%x\n", unit, unit, softc->flags));
478
479         if (cam_periph_acquire(periph) != CAM_REQ_CMP) {
480                 cam_periph_unlock(periph);
481                 return (ENXIO);
482         }
483         if (SA_IS_CTRL(dev)) {
484                 softc->ctrl_mode = 1;
485                 cam_periph_unlock(periph);
486                 return (0);
487         }
488
489
490         if (softc->flags & SA_FLAG_OPEN) {
491                 error = EBUSY;
492         } else if (softc->flags & SA_FLAG_INVALID) {
493                 error = ENXIO;
494         } else {
495                 /*
496                  * The function samount ensures media is loaded and ready.
497                  * It also does a device RESERVE if the tape isn't yet mounted.
498                  */
499                 error = samount(periph, flags, dev);
500         }
501
502         if (error) {
503                 cam_periph_release(periph);
504         } else {
505                 saprevent(periph, PR_PREVENT);
506                 softc->flags |= SA_FLAG_OPEN;
507         }
508         cam_periph_unlock(periph);
509         return (error);
510 }
511
512 static int
513 saclose(dev_t dev, int flag, int fmt, struct thread *td)
514 {
515         struct  cam_periph *periph;
516         struct  sa_softc *softc;
517         int     unit, mode, error, writing, tmp;
518         int     closedbits = SA_FLAG_OPEN;
519
520         unit = SAUNIT(dev);
521         mode = SAMODE(dev);
522         periph = cam_extend_get(saperiphs, unit);
523         if (periph == NULL)
524                 return (ENXIO); 
525
526         softc = (struct sa_softc *)periph->softc;
527
528         CAM_DEBUG(periph->path, CAM_DEBUG_TRACE|CAM_DEBUG_INFO,
529             ("saclose(%d): dev=0x%x softc=0x%x\n", unit, unit, softc->flags));
530
531
532         if ((error = cam_periph_lock(periph, 0)) != 0) {
533                 return (error);
534         }
535
536         if (SA_IS_CTRL(dev)) {
537                 softc->ctrl_mode = 0;
538                 cam_periph_release(periph);
539                 cam_periph_unlock(periph);
540                 return (0);
541         }
542
543         /*
544          * Were we writing the tape?
545          */
546         writing = (softc->flags & SA_FLAG_TAPE_WRITTEN) != 0;
547
548         /*
549          * See whether or not we need to write filemarks. If this
550          * fails, we probably have to assume we've lost tape
551          * position.
552          */
553         error = sacheckeod(periph);
554         if (error) {
555                 xpt_print_path(periph->path);
556                 printf("failed to write terminating filemark(s)\n");
557                 softc->flags |= SA_FLAG_TAPE_FROZEN;
558         }
559
560         /*
561          * Whatever we end up doing, allow users to eject tapes from here on.
562          */
563         saprevent(periph, PR_ALLOW);
564
565         /*
566          * Decide how to end...
567          */
568         if ((softc->flags & SA_FLAG_TAPE_MOUNTED) == 0) {
569                 closedbits |= SA_FLAG_TAPE_FROZEN;
570         } else switch (mode) {
571         case SA_MODE_OFFLINE:
572                 /*
573                  * An 'offline' close is an unconditional release of
574                  * frozen && mount conditions, irrespective of whether
575                  * these operations succeeded. The reason for this is
576                  * to allow at least some kind of programmatic way
577                  * around our state getting all fouled up. If somebody
578                  * issues an 'offline' command, that will be allowed
579                  * to clear state.
580                  */
581                 (void) sarewind(periph);
582                 (void) saloadunload(periph, FALSE);
583                 closedbits |= SA_FLAG_TAPE_MOUNTED|SA_FLAG_TAPE_FROZEN;
584                 break;
585         case SA_MODE_REWIND:
586                 /*
587                  * If the rewind fails, return an error- if anyone cares,
588                  * but not overwriting any previous error.
589                  *
590                  * We don't clear the notion of mounted here, but we do
591                  * clear the notion of frozen if we successfully rewound.
592                  */
593                 tmp = sarewind(periph);
594                 if (tmp) {
595                         if (error != 0)
596                                 error = tmp;
597                 } else {
598                         closedbits |= SA_FLAG_TAPE_FROZEN;
599                 }
600                 break;
601         case SA_MODE_NOREWIND:
602                 /*
603                  * If we're not rewinding/unloading the tape, find out
604                  * whether we need to back up over one of two filemarks
605                  * we wrote (if we wrote two filemarks) so that appends
606                  * from this point on will be sane.
607                  */
608                 if (error == 0 && writing && (softc->quirks & SA_QUIRK_2FM)) {
609                         tmp = saspace(periph, -1, SS_FILEMARKS);
610                         if (tmp) {
611                                 xpt_print_path(periph->path);
612                                 printf("unable to backspace over one of double"
613                                    " filemarks at end of tape\n");
614                                 xpt_print_path(periph->path);
615                                 printf("it is possible that this device"
616                                    " needs a SA_QUIRK_1FM quirk set for it\n");
617                                 softc->flags |= SA_FLAG_TAPE_FROZEN;
618                         }
619                 }
620                 break;
621         default:
622                 xpt_print_path(periph->path);
623                 panic("unknown mode 0x%x in saclose\n", mode);
624                 /* NOTREACHED */
625                 break;
626         }
627
628         /*
629          * We wish to note here that there are no more filemarks to be written.
630          */
631         softc->filemarks = 0;
632         softc->flags &= ~SA_FLAG_TAPE_WRITTEN;
633
634         /*
635          * And we are no longer open for business.
636          */
637         softc->flags &= ~closedbits;
638
639         /*
640          * Inform users if tape state if frozen....
641          */
642         if (softc->flags & SA_FLAG_TAPE_FROZEN) {
643                 xpt_print_path(periph->path);
644                 printf("tape is now frozen- use an OFFLINE, REWIND or MTEOM "
645                     "command to clear this state.\n");
646         }
647         
648         /* release the device if it is no longer mounted */
649         if ((softc->flags & SA_FLAG_TAPE_MOUNTED) == 0)
650                 sareservereleaseunit(periph, FALSE);
651
652         cam_periph_unlock(periph);
653         cam_periph_release(periph);
654
655         return (error); 
656 }
657
658 /*
659  * Actually translate the requested transfer into one the physical driver
660  * can understand.  The transfer is described by a buf and will include
661  * only one physical transfer.
662  */
663 static void
664 sastrategy(struct buf *bp)
665 {
666         struct cam_periph *periph;
667         struct sa_softc *softc;
668         u_int  unit;
669         
670         if (SA_IS_CTRL(bp->b_dev)) {
671                 bp->b_error = EINVAL;
672                 goto bad;
673         }
674         unit = SAUNIT(bp->b_dev);
675         periph = cam_extend_get(saperiphs, unit);
676         if (periph == NULL) {
677                 bp->b_error = ENXIO;
678                 goto bad;
679         }
680         softc = (struct sa_softc *)periph->softc;
681
682         crit_enter();
683
684         if (softc->flags & SA_FLAG_INVALID) {
685                 crit_exit();
686                 bp->b_error = ENXIO;
687                 goto bad;
688         }
689
690         if (softc->flags & SA_FLAG_TAPE_FROZEN) {
691                 crit_exit();
692                 bp->b_error = EPERM;
693                 goto bad;
694         }
695
696         crit_exit();
697
698         /*
699          * If it's a null transfer, return immediatly
700          */
701         if (bp->b_bcount == 0)
702                 goto done;
703
704         /* valid request?  */
705         if (softc->flags & SA_FLAG_FIXED) {
706                 /*
707                  * Fixed block device.  The byte count must
708                  * be a multiple of our block size.
709                  */
710                 if (((softc->blk_mask != ~0) &&
711                     ((bp->b_bcount & softc->blk_mask) != 0)) ||
712                     ((softc->blk_mask == ~0) &&
713                     ((bp->b_bcount % softc->min_blk) != 0))) {
714                         xpt_print_path(periph->path);
715                         printf("Invalid request.  Fixed block device "
716                                "requests must be a multiple "
717                                "of %d bytes\n", softc->media_blksize);
718                         bp->b_error = EINVAL;
719                         goto bad;
720                 }
721         } else if ((bp->b_bcount > softc->max_blk) ||
722                    (bp->b_bcount < softc->min_blk) ||
723                    (bp->b_bcount & softc->blk_mask) != 0) {
724
725                 xpt_print_path(periph->path);
726                 printf("Invalid request.  Variable block device "
727                     "requests must be ");
728                 if (softc->blk_mask != 0) {
729                         printf("a multiple of %d ", (0x1 << softc->blk_gran));
730                 }
731                 printf("between %d and %d bytes\n", softc->min_blk,
732                     softc->max_blk);
733                 bp->b_error = EINVAL;
734                 goto bad;
735         }
736         
737         /*
738          * Mask interrupts so that the device cannot be invalidated until
739          * after we are in the queue.  Otherwise, we might not properly
740          * clean up one of the buffers.
741          */
742         crit_enter();
743         
744         /*
745          * Place it at the end of the queue.
746          */
747         bufq_insert_tail(&softc->buf_queue, bp);
748
749         softc->queue_count++;
750         CAM_DEBUG(periph->path, CAM_DEBUG_INFO, ("sastrategy: enqueuing a %d "
751             "%s byte %s queue count now %d\n", (int) bp->b_bcount,
752              (softc->flags & SA_FLAG_FIXED)?  "fixed" : "variable",
753              (bp->b_flags & B_READ)? "read" : "write", softc->queue_count));
754
755         crit_exit();
756         
757         /*
758          * Schedule ourselves for performing the work.
759          */
760         xpt_schedule(periph, 1);
761
762         return;
763 bad:
764         bp->b_flags |= B_ERROR;
765 done:
766
767         /*
768          * Correctly set the buf to indicate a completed xfer
769          */
770         bp->b_resid = bp->b_bcount;
771         biodone(bp);
772 }
773
774 static int
775 saioctl(dev_t dev, u_long cmd, caddr_t arg, int flag, struct thread *td)
776 {
777         struct cam_periph *periph;
778         struct sa_softc *softc;
779         scsi_space_code spaceop;
780         int didlockperiph = 0;
781         int unit;
782         int mode;
783         int density;
784         int error = 0;
785
786         unit = SAUNIT(dev);
787         mode = SAMODE(dev);
788         density = SADENSITY(dev);
789         error = 0;              /* shut up gcc */
790         spaceop = 0;            /* shut up gcc */
791
792         periph = cam_extend_get(saperiphs, unit);
793         if (periph == NULL)
794                 return (ENXIO); 
795
796         softc = (struct sa_softc *)periph->softc;
797
798         /*
799          * Check for control mode accesses. We allow MTIOCGET and
800          * MTIOCERRSTAT (but need to be the only one open in order
801          * to clear latched status), and MTSETBSIZE, MTSETDNSTY
802          * and MTCOMP (but need to be the only one accessing this
803          * device to run those).
804          */
805
806         if (SA_IS_CTRL(dev)) {
807                 switch (cmd) {
808                 case MTIOCGETEOTMODEL:
809                 case MTIOCGET:
810                         break;
811                 case MTIOCERRSTAT:
812                         /*
813                          * If the periph isn't already locked, lock it
814                          * so our MTIOCERRSTAT can reset latched error stats.
815                          *
816                          * If the periph is already locked, skip it because
817                          * we're just getting status and it'll be up to the
818                          * other thread that has this device open to do
819                          * an MTIOCERRSTAT that would clear latched status.
820                          */
821                         crit_enter();
822                         if ((periph->flags & CAM_PERIPH_LOCKED) == 0) {
823                                 error = cam_periph_lock(periph, PCATCH);
824                                 if (error != 0) {
825                                         crit_exit();
826                                         return (error);
827                                 }
828                                 didlockperiph = 1;
829                         }
830                         crit_exit();
831                         break;
832
833                 case MTIOCSETEOTMODEL:
834                 case MTSETBSIZ:
835                 case MTSETDNSTY:
836                 case MTCOMP:
837                         /*
838                          * We need to acquire the peripheral here rather
839                          * than at open time because we are sharing writable
840                          * access to data structures.
841                          */
842                         crit_enter();
843                         error = cam_periph_lock(periph, PCATCH);
844                         if (error != 0) {
845                                 crit_exit();
846                                 return (error);
847                         }
848                         didlockperiph = 1;
849                         crit_exit();
850                         break;
851
852                 default:
853                         return (EINVAL);
854                 }
855         }
856
857         /*
858          * Find the device that the user is talking about
859          */
860         switch (cmd) {
861         case MTIOCGET:
862         {
863                 struct mtget *g = (struct mtget *)arg;
864
865                 /*
866                  * If this isn't the control mode device, actually go out
867                  * and ask the drive again what it's set to.
868                  */
869                 if (!SA_IS_CTRL(dev)) {
870                         u_int8_t write_protect;
871                         int comp_enabled, comp_supported;
872                         error = sagetparams(periph, SA_PARAM_ALL,
873                             &softc->media_blksize, &softc->media_density,
874                             &softc->media_numblks, &softc->buffer_mode,
875                             &write_protect, &softc->speed, &comp_supported,
876                             &comp_enabled, &softc->comp_algorithm, NULL);
877                         if (error)
878                                 break;
879                         if (write_protect)
880                                 softc->flags |= SA_FLAG_TAPE_WP;
881                         else
882                                 softc->flags &= ~SA_FLAG_TAPE_WP;
883                         softc->flags &= ~(SA_FLAG_COMP_SUPP|
884                             SA_FLAG_COMP_ENABLED|SA_FLAG_COMP_UNSUPP);
885                         if (comp_supported) {
886                                 if (softc->saved_comp_algorithm == 0)
887                                         softc->saved_comp_algorithm =
888                                             softc->comp_algorithm;
889                                 softc->flags |= SA_FLAG_COMP_SUPP;
890                                 if (comp_enabled)
891                                         softc->flags |= SA_FLAG_COMP_ENABLED;
892                         } else  
893                                 softc->flags |= SA_FLAG_COMP_UNSUPP;
894                 }
895                 bzero(g, sizeof(struct mtget));
896                 g->mt_type = MT_ISAR;
897                 if (softc->flags & SA_FLAG_COMP_UNSUPP) {
898                         g->mt_comp = MT_COMP_UNSUPP;
899                         g->mt_comp0 = MT_COMP_UNSUPP;
900                         g->mt_comp1 = MT_COMP_UNSUPP;
901                         g->mt_comp2 = MT_COMP_UNSUPP;
902                         g->mt_comp3 = MT_COMP_UNSUPP;
903                 } else {
904                         if ((softc->flags & SA_FLAG_COMP_ENABLED) == 0) {
905                                 g->mt_comp = MT_COMP_DISABLED;
906                         } else {
907                                 g->mt_comp = softc->comp_algorithm;
908                         }
909                         g->mt_comp0 = softc->comp_algorithm;
910                         g->mt_comp1 = softc->comp_algorithm;
911                         g->mt_comp2 = softc->comp_algorithm;
912                         g->mt_comp3 = softc->comp_algorithm;
913                 }
914                 g->mt_density = softc->media_density;
915                 g->mt_density0 = softc->media_density;
916                 g->mt_density1 = softc->media_density;
917                 g->mt_density2 = softc->media_density;
918                 g->mt_density3 = softc->media_density;
919                 g->mt_blksiz = softc->media_blksize;
920                 g->mt_blksiz0 = softc->media_blksize;
921                 g->mt_blksiz1 = softc->media_blksize;
922                 g->mt_blksiz2 = softc->media_blksize;
923                 g->mt_blksiz3 = softc->media_blksize;
924                 g->mt_fileno = softc->fileno;
925                 g->mt_blkno = softc->blkno;
926                 g->mt_dsreg = (short) softc->dsreg;
927                 /*
928                  * Yes, we know that this is likely to overflow
929                  */
930                 if (softc->last_resid_was_io) {
931                         if ((g->mt_resid = (short) softc->last_io_resid) != 0) {
932                                 if (SA_IS_CTRL(dev) == 0 || didlockperiph) {
933                                         softc->last_io_resid = 0;
934                                 }
935                         }
936                 } else {
937                         if ((g->mt_resid = (short)softc->last_ctl_resid) != 0) {
938                                 if (SA_IS_CTRL(dev) == 0 || didlockperiph) {
939                                         softc->last_ctl_resid = 0;
940                                 }
941                         }
942                 }
943                 error = 0;
944                 break;
945         }
946         case MTIOCERRSTAT:
947         {
948                 struct scsi_tape_errors *sep =
949                     &((union mterrstat *)arg)->scsi_errstat;
950
951                 CAM_DEBUG(periph->path, CAM_DEBUG_TRACE,
952                     ("saioctl: MTIOCERRSTAT\n"));
953
954                 bzero(sep, sizeof(*sep));
955                 sep->io_resid = softc->last_io_resid;
956                 bcopy((caddr_t) &softc->last_io_sense, sep->io_sense,
957                     sizeof (sep->io_sense));
958                 bcopy((caddr_t) &softc->last_io_cdb, sep->io_cdb,
959                     sizeof (sep->io_cdb));
960                 sep->ctl_resid = softc->last_ctl_resid;
961                 bcopy((caddr_t) &softc->last_ctl_sense, sep->ctl_sense,
962                     sizeof (sep->ctl_sense));
963                 bcopy((caddr_t) &softc->last_ctl_cdb, sep->ctl_cdb,
964                     sizeof (sep->ctl_cdb));
965
966                 if (SA_IS_CTRL(dev) == 0 || didlockperiph)
967                         bzero((caddr_t) &softc->errinfo,
968                             sizeof (softc->errinfo));
969                 error = 0;
970                 break;
971         }
972         case MTIOCTOP:
973         {
974                 struct mtop *mt;
975                 int    count;
976
977                 mt = (struct mtop *)arg;
978
979                 CAM_DEBUG(periph->path, CAM_DEBUG_TRACE,
980                          ("saioctl: op=0x%x count=0x%x\n",
981                           mt->mt_op, mt->mt_count));
982
983                 count = mt->mt_count;
984                 switch (mt->mt_op) {
985                 case MTWEOF:    /* write an end-of-file marker */
986                         /*
987                          * We don't need to clear the SA_FLAG_TAPE_WRITTEN
988                          * flag because by keeping track of filemarks
989                          * we have last written we know ehether or not
990                          * we need to write more when we close the device.
991                          */
992                         error = sawritefilemarks(periph, count, FALSE);
993                         break;
994                 case MTWSS:     /* write a setmark */
995                         error = sawritefilemarks(periph, count, TRUE);
996                         break;
997                 case MTBSR:     /* backward space record */
998                 case MTFSR:     /* forward space record */
999                 case MTBSF:     /* backward space file */
1000                 case MTFSF:     /* forward space file */
1001                 case MTBSS:     /* backward space setmark */
1002                 case MTFSS:     /* forward space setmark */
1003                 case MTEOD:     /* space to end of recorded medium */
1004                 {
1005                         int nmarks;
1006
1007                         spaceop = SS_FILEMARKS;
1008                         nmarks = softc->filemarks;
1009                         error = sacheckeod(periph);
1010                         if (error) {
1011                                 xpt_print_path(periph->path);
1012                                 printf("EOD check prior to spacing failed\n");
1013                                 softc->flags |= SA_FLAG_EIO_PENDING;
1014                                 break;
1015                         }
1016                         nmarks -= softc->filemarks;
1017                         switch(mt->mt_op) {
1018                         case MTBSR:
1019                                 count = -count;
1020                                 /* FALLTHROUGH */
1021                         case MTFSR:
1022                                 spaceop = SS_BLOCKS;
1023                                 break;
1024                         case MTBSF:
1025                                 count = -count;
1026                                 /* FALLTHROUGH */
1027                         case MTFSF:
1028                                 break;
1029                         case MTBSS:
1030                                 count = -count;
1031                                 /* FALLTHROUGH */
1032                         case MTFSS:
1033                                 spaceop = SS_SETMARKS;
1034                                 break;
1035                         case MTEOD:
1036                                 spaceop = SS_EOD;
1037                                 count = 0;
1038                                 nmarks = 0;
1039                                 break;
1040                         default:
1041                                 error = EINVAL;
1042                                 break;
1043                         }
1044                         if (error)
1045                                 break;
1046
1047                         nmarks = softc->filemarks;
1048                         /*
1049                          * XXX: Why are we checking again?
1050                          */
1051                         error = sacheckeod(periph);
1052                         if (error)
1053                                 break;
1054                         nmarks -= softc->filemarks;
1055                         error = saspace(periph, count - nmarks, spaceop);
1056                         /*
1057                          * At this point, clear that we've written the tape
1058                          * and that we've written any filemarks. We really
1059                          * don't know what the applications wishes to do next-
1060                          * the sacheckeod's will make sure we terminated the
1061                          * tape correctly if we'd been writing, but the next
1062                          * action the user application takes will set again
1063                          * whether we need to write filemarks.
1064                          */
1065                         softc->flags &=
1066                             ~(SA_FLAG_TAPE_WRITTEN|SA_FLAG_TAPE_FROZEN);
1067                         softc->filemarks = 0;
1068                         break;
1069                 }
1070                 case MTREW:     /* rewind */
1071                         (void) sacheckeod(periph);
1072                         error = sarewind(periph);
1073                         /* see above */
1074                         softc->flags &=
1075                             ~(SA_FLAG_TAPE_WRITTEN|SA_FLAG_TAPE_FROZEN);
1076                         softc->flags &= ~SA_FLAG_ERR_PENDING;
1077                         softc->filemarks = 0;
1078                         break;
1079                 case MTERASE:   /* erase */
1080                         error = saerase(periph, count);
1081                         softc->flags &=
1082                             ~(SA_FLAG_TAPE_WRITTEN|SA_FLAG_TAPE_FROZEN);
1083                         softc->flags &= ~SA_FLAG_ERR_PENDING;
1084                         break;
1085                 case MTRETENS:  /* re-tension tape */
1086                         error = saretension(periph);            
1087                         softc->flags &=
1088                             ~(SA_FLAG_TAPE_WRITTEN|SA_FLAG_TAPE_FROZEN);
1089                         softc->flags &= ~SA_FLAG_ERR_PENDING;
1090                         break;
1091                 case MTOFFL:    /* rewind and put the drive offline */
1092
1093                         (void) sacheckeod(periph);
1094                         /* see above */
1095                         softc->flags &= ~SA_FLAG_TAPE_WRITTEN;
1096                         softc->filemarks = 0;
1097
1098                         error = sarewind(periph);
1099                         /* clear the frozen flag anyway */
1100                         softc->flags &= ~SA_FLAG_TAPE_FROZEN;
1101
1102                         /*
1103                          * Be sure to allow media removal before ejecting.
1104                          */
1105
1106                         saprevent(periph, PR_ALLOW);
1107                         if (error == 0) {
1108                                 error = saloadunload(periph, FALSE);
1109                                 if (error == 0) {
1110                                         softc->flags &= ~SA_FLAG_TAPE_MOUNTED;
1111                                 }
1112                         }
1113                         break;
1114
1115                 case MTNOP:     /* no operation, sets status only */
1116                 case MTCACHE:   /* enable controller cache */
1117                 case MTNOCACHE: /* disable controller cache */
1118                         error = 0;
1119                         break;
1120
1121                 case MTSETBSIZ: /* Set block size for device */
1122
1123                         error = sasetparams(periph, SA_PARAM_BLOCKSIZE, count,
1124                                             0, 0, 0);
1125                         if (error == 0) {
1126                                 softc->last_media_blksize =
1127                                     softc->media_blksize;
1128                                 softc->media_blksize = count;
1129                                 if (count) {
1130                                         softc->flags |= SA_FLAG_FIXED;
1131                                         if (powerof2(count)) {
1132                                                 softc->blk_shift =
1133                                                     ffs(count) - 1;
1134                                                 softc->blk_mask = count - 1;
1135                                         } else {
1136                                                 softc->blk_mask = ~0;
1137                                                 softc->blk_shift = 0;
1138                                         }
1139                                         /*
1140                                          * Make the user's desire 'persistent'.
1141                                          */
1142                                         softc->quirks &= ~SA_QUIRK_VARIABLE;
1143                                         softc->quirks |= SA_QUIRK_FIXED;
1144                                 } else {
1145                                         softc->flags &= ~SA_FLAG_FIXED;
1146                                         if (softc->max_blk == 0) {
1147                                                 softc->max_blk = ~0;
1148                                         }
1149                                         softc->blk_shift = 0;
1150                                         if (softc->blk_gran != 0) {
1151                                                 softc->blk_mask =
1152                                                     softc->blk_gran - 1;
1153                                         } else {
1154                                                 softc->blk_mask = 0;
1155                                         }
1156                                         /*
1157                                          * Make the user's desire 'persistent'.
1158                                          */
1159                                         softc->quirks |= SA_QUIRK_VARIABLE;
1160                                         softc->quirks &= ~SA_QUIRK_FIXED;
1161                                 }
1162                         }
1163                         break;
1164                 case MTSETDNSTY:        /* Set density for device and mode */
1165                         if (count > UCHAR_MAX) {
1166                                 error = EINVAL; 
1167                                 break;
1168                         } else {
1169                                 error = sasetparams(periph, SA_PARAM_DENSITY,
1170                                                     0, count, 0, 0);
1171                         }
1172                         break;
1173                 case MTCOMP:    /* enable compression */
1174                         /*
1175                          * Some devices don't support compression, and
1176                          * don't like it if you ask them for the
1177                          * compression page.
1178                          */
1179                         if ((softc->quirks & SA_QUIRK_NOCOMP) ||
1180                             (softc->flags & SA_FLAG_COMP_UNSUPP)) {
1181                                 error = ENODEV;
1182                                 break;
1183                         }
1184                         error = sasetparams(periph, SA_PARAM_COMPRESSION,
1185                             0, 0, count, SF_NO_PRINT);
1186                         break;
1187                 default:
1188                         error = EINVAL;
1189                 }
1190                 break;
1191         }
1192         case MTIOCIEOT:
1193         case MTIOCEEOT:
1194                 error = 0;
1195                 break;
1196         case MTIOCRDSPOS:
1197                 error = sardpos(periph, 0, (u_int32_t *) arg);
1198                 break;
1199         case MTIOCRDHPOS:
1200                 error = sardpos(periph, 1, (u_int32_t *) arg);
1201                 break;
1202         case MTIOCSLOCATE:
1203                 error = sasetpos(periph, 0, (u_int32_t *) arg);
1204                 break;
1205         case MTIOCHLOCATE:
1206                 error = sasetpos(periph, 1, (u_int32_t *) arg);
1207                 break;
1208         case MTIOCGETEOTMODEL:
1209                 error = 0;
1210                 if (softc->quirks & SA_QUIRK_1FM)
1211                         mode = 1;
1212                 else
1213                         mode = 2;
1214                 *((u_int32_t *) arg) = mode;
1215                 break;
1216         case MTIOCSETEOTMODEL:
1217                 error = 0;
1218                 switch (*((u_int32_t *) arg)) {
1219                 case 1:
1220                         softc->quirks &= ~SA_QUIRK_2FM;
1221                         softc->quirks |= SA_QUIRK_1FM;
1222                         break;
1223                 case 2:
1224                         softc->quirks &= ~SA_QUIRK_1FM;
1225                         softc->quirks |= SA_QUIRK_2FM;
1226                         break;
1227                 default:
1228                         error = EINVAL;
1229                         break;
1230                 }
1231                 break;
1232         default:
1233                 error = cam_periph_ioctl(periph, cmd, arg, saerror);
1234                 break;
1235         }
1236
1237         /*
1238          * Check to see if we cleared a frozen state
1239          */
1240         if (error == 0 && (softc->flags & SA_FLAG_TAPE_FROZEN)) {
1241                 switch(cmd) {
1242                 case MTIOCRDSPOS:
1243                 case MTIOCRDHPOS:
1244                 case MTIOCSLOCATE:
1245                 case MTIOCHLOCATE:
1246                         softc->fileno = (daddr_t) -1;
1247                         softc->blkno = (daddr_t) -1;
1248                         softc->flags &= ~SA_FLAG_TAPE_FROZEN;
1249                         xpt_print_path(periph->path);
1250                         printf("tape state now unfrozen.\n");
1251                         break;
1252                 default:
1253                         break;
1254                 }
1255         }
1256         if (didlockperiph) {
1257                 cam_periph_unlock(periph);
1258         }
1259         return (error);
1260 }
1261
1262 static void
1263 sainit(void)
1264 {
1265         cam_status status;
1266         struct cam_path *path;
1267
1268         /*
1269          * Create our extend array for storing the devices we attach to.
1270          */
1271         saperiphs = cam_extend_new();
1272         if (saperiphs == NULL) {
1273                 printf("sa: Failed to alloc extend array!\n");
1274                 return;
1275         }
1276         
1277         /*
1278          * Install a global async callback.
1279          */
1280         status = xpt_create_path(&path, NULL, CAM_XPT_PATH_ID,
1281                                  CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD);
1282
1283         if (status == CAM_REQ_CMP) {
1284                 /* Register the async callbacks of interrest */
1285                 struct ccb_setasync csa; /*
1286                                           * This is an immediate CCB,
1287                                           * so using the stack is OK
1288                                           */
1289                 xpt_setup_ccb(&csa.ccb_h, path, 5);
1290                 csa.ccb_h.func_code = XPT_SASYNC_CB;
1291                 csa.event_enable = AC_FOUND_DEVICE;
1292                 csa.callback = saasync;
1293                 csa.callback_arg = NULL;
1294                 xpt_action((union ccb *)&csa);
1295                 status = csa.ccb_h.status;
1296                 xpt_free_path(path);
1297         }
1298
1299         if (status != CAM_REQ_CMP) {
1300                 printf("sa: Failed to attach master async callback "
1301                        "due to status 0x%x!\n", status);
1302         }
1303 }
1304
1305 static void
1306 saoninvalidate(struct cam_periph *periph)
1307 {
1308         struct sa_softc *softc;
1309         struct buf *q_bp;
1310         struct ccb_setasync csa;
1311
1312         softc = (struct sa_softc *)periph->softc;
1313
1314         /*
1315          * De-register any async callbacks.
1316          */
1317         xpt_setup_ccb(&csa.ccb_h, periph->path,
1318                       /* priority */ 5);
1319         csa.ccb_h.func_code = XPT_SASYNC_CB;
1320         csa.event_enable = 0;
1321         csa.callback = saasync;
1322         csa.callback_arg = periph;
1323         xpt_action((union ccb *)&csa);
1324
1325         softc->flags |= SA_FLAG_INVALID;
1326
1327         /*
1328          * We need to be in a critical section here to keep the buffer
1329          * queue from being modified while we traverse it.
1330          */
1331         crit_enter();
1332
1333         /*
1334          * Return all queued I/O with ENXIO.
1335          * XXX Handle any transactions queued to the card
1336          *     with XPT_ABORT_CCB.
1337          */
1338         while ((q_bp = bufq_first(&softc->buf_queue)) != NULL){
1339                 bufq_remove(&softc->buf_queue, q_bp);
1340                 q_bp->b_resid = q_bp->b_bcount;
1341                 q_bp->b_error = ENXIO;
1342                 q_bp->b_flags |= B_ERROR;
1343                 biodone(q_bp);
1344         }
1345         softc->queue_count = 0;
1346         crit_exit();
1347
1348         xpt_print_path(periph->path);
1349         printf("lost device\n");
1350
1351 }
1352
1353 static void
1354 sacleanup(struct cam_periph *periph)
1355 {
1356         struct sa_softc *softc;
1357
1358         softc = (struct sa_softc *)periph->softc;
1359
1360         devstat_remove_entry(&softc->device_stats);
1361
1362         cam_extend_release(saperiphs, periph->unit_number);
1363         xpt_print_path(periph->path);
1364         printf("removing device entry\n");
1365         cdevsw_remove(&sa_cdevsw, SA_UNITMASK, SA_UNIT(periph->unit_number));
1366         free(softc, M_DEVBUF);
1367 }
1368
1369 static void
1370 saasync(void *callback_arg, u_int32_t code,
1371         struct cam_path *path, void *arg)
1372 {
1373         struct cam_periph *periph;
1374
1375         periph = (struct cam_periph *)callback_arg;
1376         switch (code) {
1377         case AC_FOUND_DEVICE:
1378         {
1379                 struct ccb_getdev *cgd;
1380                 cam_status status;
1381
1382                 cgd = (struct ccb_getdev *)arg;
1383                 if (cgd == NULL)
1384                         break;
1385
1386                 if (SID_TYPE(&cgd->inq_data) != T_SEQUENTIAL)
1387                         break;
1388
1389                 /*
1390                  * Allocate a peripheral instance for
1391                  * this device and start the probe
1392                  * process.
1393                  */
1394                 status = cam_periph_alloc(saregister, saoninvalidate,
1395                                           sacleanup, sastart,
1396                                           "sa", CAM_PERIPH_BIO, cgd->ccb_h.path,
1397                                           saasync, AC_FOUND_DEVICE, cgd);
1398
1399                 if (status != CAM_REQ_CMP
1400                  && status != CAM_REQ_INPROG)
1401                         printf("saasync: Unable to probe new device "
1402                                 "due to status 0x%x\n", status);
1403                 break;
1404         }
1405         default:
1406                 cam_periph_async(periph, code, path, arg);
1407                 break;
1408         }
1409 }
1410
1411 static cam_status
1412 saregister(struct cam_periph *periph, void *arg)
1413 {
1414         struct sa_softc *softc;
1415         struct ccb_setasync csa;
1416         struct ccb_getdev *cgd;
1417         caddr_t match;
1418         int i;
1419         
1420         cgd = (struct ccb_getdev *)arg;
1421         if (periph == NULL) {
1422                 printf("saregister: periph was NULL!!\n");
1423                 return (CAM_REQ_CMP_ERR);
1424         }
1425
1426         if (cgd == NULL) {
1427                 printf("saregister: no getdev CCB, can't register device\n");
1428                 return (CAM_REQ_CMP_ERR);
1429         }
1430
1431         softc = malloc(sizeof (*softc), M_DEVBUF, M_INTWAIT | M_ZERO);
1432         softc->scsi_rev = SID_ANSI_REV(&cgd->inq_data);
1433         softc->state = SA_STATE_NORMAL;
1434         softc->fileno = (daddr_t) -1;
1435         softc->blkno = (daddr_t) -1;
1436
1437         bufq_init(&softc->buf_queue);
1438         periph->softc = softc;
1439         cam_extend_set(saperiphs, periph->unit_number, periph);
1440
1441         /*
1442          * See if this device has any quirks.
1443          */
1444         match = cam_quirkmatch((caddr_t)&cgd->inq_data,
1445                                (caddr_t)sa_quirk_table,
1446                                sizeof(sa_quirk_table)/sizeof(*sa_quirk_table),
1447                                sizeof(*sa_quirk_table), scsi_inquiry_match);
1448
1449         if (match != NULL) {
1450                 softc->quirks = ((struct sa_quirk_entry *)match)->quirks;
1451                 softc->last_media_blksize =
1452                     ((struct sa_quirk_entry *)match)->prefblk;
1453 #ifdef  CAMDEBUG
1454                 xpt_print_path(periph->path);
1455                 printf("found quirk entry %d\n", (int)
1456                     (((struct sa_quirk_entry *) match) - sa_quirk_table));
1457 #endif
1458         } else
1459                 softc->quirks = SA_QUIRK_NONE;
1460
1461         /*
1462          * The SA driver supports a blocksize, but we don't know the
1463          * blocksize until we media is inserted.  So, set a flag to
1464          * indicate that the blocksize is unavailable right now.
1465          */
1466         devstat_add_entry(&softc->device_stats, "sa", periph->unit_number, 0,
1467             DEVSTAT_BS_UNAVAILABLE, SID_TYPE(&cgd->inq_data) |
1468             DEVSTAT_TYPE_IF_SCSI, DEVSTAT_PRIORITY_TAPE);
1469
1470         cdevsw_add(&sa_cdevsw, SA_UNITMASK, SA_UNIT(periph->unit_number));
1471         make_dev(&sa_cdevsw, SAMINOR(SA_CTLDEV,
1472             periph->unit_number, 0, SA_ATYPE_R), UID_ROOT, GID_OPERATOR,
1473             0660, "r%s%d.ctl", periph->periph_name, periph->unit_number);
1474
1475         make_dev(&sa_cdevsw, SAMINOR(SA_NOT_CTLDEV,
1476             periph->unit_number, 0, SA_ATYPE_R), UID_ROOT, GID_OPERATOR,
1477             0660, "r%s%d", periph->periph_name, periph->unit_number);
1478
1479         make_dev(&sa_cdevsw, SAMINOR(SA_NOT_CTLDEV,
1480             periph->unit_number, 0, SA_ATYPE_NR), UID_ROOT, GID_OPERATOR,
1481             0660, "nr%s%d", periph->periph_name, periph->unit_number);
1482
1483         make_dev(&sa_cdevsw, SAMINOR(SA_NOT_CTLDEV,
1484             periph->unit_number, 0, SA_ATYPE_ER), UID_ROOT, GID_OPERATOR,
1485             0660, "er%s%d", periph->periph_name, periph->unit_number);
1486
1487         for (i = 0; i < SA_NUM_MODES; i++) {
1488
1489                 make_dev(&sa_cdevsw,
1490                     SAMINOR(SA_NOT_CTLDEV, periph->unit_number, i, SA_ATYPE_R),
1491                     UID_ROOT, GID_OPERATOR, 0660, "r%s%d.%d",
1492                     periph->periph_name, periph->unit_number, i);
1493
1494                 make_dev(&sa_cdevsw,
1495                     SAMINOR(SA_NOT_CTLDEV, periph->unit_number, i, SA_ATYPE_NR),
1496                     UID_ROOT, GID_OPERATOR, 0660, "nr%s%d.%d",
1497                     periph->periph_name, periph->unit_number, i);
1498
1499
1500                 make_dev(&sa_cdevsw,
1501                     SAMINOR(SA_NOT_CTLDEV, periph->unit_number, i, SA_ATYPE_ER),
1502                     UID_ROOT, GID_OPERATOR, 0660, "er%s%d.%d",
1503                     periph->periph_name, periph->unit_number, i);
1504         }
1505
1506         /*
1507          * Add an async callback so that we get
1508          * notified if this device goes away.
1509          */
1510         xpt_setup_ccb(&csa.ccb_h, periph->path, /* priority */ 5);
1511         csa.ccb_h.func_code = XPT_SASYNC_CB;
1512         csa.event_enable = AC_LOST_DEVICE;
1513         csa.callback = saasync;
1514         csa.callback_arg = periph;
1515         xpt_action((union ccb *)&csa);
1516
1517         xpt_announce_periph(periph, NULL);
1518
1519         return (CAM_REQ_CMP);
1520 }
1521
1522 static void
1523 sastart(struct cam_periph *periph, union ccb *start_ccb)
1524 {
1525         struct sa_softc *softc;
1526
1527         softc = (struct sa_softc *)periph->softc;
1528
1529         CAM_DEBUG(periph->path, CAM_DEBUG_INFO, ("sastart"));
1530
1531         
1532         switch (softc->state) {
1533         case SA_STATE_NORMAL:
1534         {
1535                 /* Pull a buffer from the queue and get going on it */          
1536                 struct buf *bp;
1537
1538                 /*
1539                  * See if there is a buf with work for us to do..
1540                  */
1541                 crit_enter();
1542                 bp = bufq_first(&softc->buf_queue);
1543                 if (periph->immediate_priority <= periph->pinfo.priority) {
1544                         CAM_DEBUG_PRINT(CAM_DEBUG_SUBTRACE,
1545                                         ("queuing for immediate ccb\n"));
1546                         Set_CCB_Type(start_ccb, SA_CCB_WAITING);
1547                         SLIST_INSERT_HEAD(&periph->ccb_list, &start_ccb->ccb_h,
1548                                           periph_links.sle);
1549                         periph->immediate_priority = CAM_PRIORITY_NONE;
1550                         crit_exit();
1551                         wakeup(&periph->ccb_list);
1552                 } else if (bp == NULL) {
1553                         crit_exit();
1554                         xpt_release_ccb(start_ccb);
1555                 } else if ((softc->flags & SA_FLAG_ERR_PENDING) != 0) {
1556                         struct buf *done_bp;
1557 again:
1558                         softc->queue_count--;
1559                         bufq_remove(&softc->buf_queue, bp);
1560                         bp->b_resid = bp->b_bcount;
1561                         done_bp = bp;
1562                         if ((softc->flags & SA_FLAG_EOM_PENDING) != 0) {
1563                                 /*
1564                                  * We now just clear errors in this case
1565                                  * and let the residual be the notifier.
1566                                  */
1567                                 bp->b_error = 0;
1568                         } else if ((softc->flags & SA_FLAG_EOF_PENDING) != 0) {
1569                                 /*
1570                                  * This can only happen if we're reading
1571                                  * in fixed length mode. In this case,
1572                                  * we dump the rest of the list the
1573                                  * same way.
1574                                  */
1575                                 bp->b_error = 0;
1576                                 if (bufq_first(&softc->buf_queue) != NULL) {
1577                                         biodone(done_bp);
1578                                         goto again;
1579                                 }
1580                         } else if ((softc->flags & SA_FLAG_EIO_PENDING) != 0) {
1581                                 bp->b_error = EIO;
1582                                 bp->b_flags |= B_ERROR;
1583                         }
1584                         bp = bufq_first(&softc->buf_queue);
1585                         /*
1586                          * Only if we have no other buffers queued up
1587                          * do we clear the pending error flag.
1588                          */
1589                         if (bp == NULL)
1590                                 softc->flags &= ~SA_FLAG_ERR_PENDING;
1591                         CAM_DEBUG(periph->path, CAM_DEBUG_INFO,
1592                             ("sastart- ERR_PENDING now 0x%x, bp is %sNULL, "
1593                             "%d more buffers queued up\n",
1594                             (softc->flags & SA_FLAG_ERR_PENDING),
1595                             (bp != NULL)? "not " : " ", softc->queue_count));
1596                         crit_exit();
1597                         xpt_release_ccb(start_ccb);
1598                         biodone(done_bp);
1599                 } else {
1600                         u_int32_t length;
1601
1602                         bufq_remove(&softc->buf_queue, bp);
1603                         softc->queue_count--;
1604
1605                         if ((softc->flags & SA_FLAG_FIXED) != 0) {
1606                                 if (softc->blk_shift != 0) {
1607                                         length =
1608                                             bp->b_bcount >> softc->blk_shift;
1609                                 } else if (softc->media_blksize != 0) {
1610                                         length =
1611                                             bp->b_bcount / softc->media_blksize;
1612                                 } else {
1613                                         bp->b_error = EIO;
1614                                         xpt_print_path(periph->path);
1615                                         printf("zero blocksize for "
1616                                             "FIXED length writes?\n");
1617                                         crit_exit();
1618                                         biodone(bp);
1619                                         break;
1620                                 }
1621                                 CAM_DEBUG(periph->path, CAM_DEBUG_INFO,
1622                                     ("Fixed Record Count is %d\n", length));
1623                         } else {
1624                                 length = bp->b_bcount;
1625                                 CAM_DEBUG(start_ccb->ccb_h.path, CAM_DEBUG_INFO,
1626                                     ("Variable Record Count is %d\n", length));
1627                         }
1628                         devstat_start_transaction(&softc->device_stats);
1629                         /*
1630                          * Some people have theorized that we should
1631                          * suppress illegal length indication if we are
1632                          * running in variable block mode so that we don't
1633                          * have to request sense every time our requested
1634                          * block size is larger than the written block.
1635                          * The residual information from the ccb allows
1636                          * us to identify this situation anyway.  The only
1637                          * problem with this is that we will not get
1638                          * information about blocks that are larger than
1639                          * our read buffer unless we set the block size
1640                          * in the mode page to something other than 0.
1641                          *
1642                          * I believe that this is a non-issue. If user apps
1643                          * don't adjust their read size to match our record
1644                          * size, that's just life. Anyway, the typical usage
1645                          * would be to issue, e.g., 64KB reads and occasionally
1646                          * have to do deal with 512 byte or 1KB intermediate
1647                          * records.
1648                          */
1649                         softc->dsreg = (bp->b_flags & B_READ)?
1650                             MTIO_DSREG_RD : MTIO_DSREG_WR;
1651                         scsi_sa_read_write(&start_ccb->csio, 0, sadone,
1652                             MSG_SIMPLE_Q_TAG, (bp->b_flags & B_READ) != 0,
1653                             FALSE, (softc->flags & SA_FLAG_FIXED) != 0,
1654                             length, bp->b_data, bp->b_bcount, SSD_FULL_SIZE,
1655                             IO_TIMEOUT);
1656                         start_ccb->ccb_h.ccb_pflags &= ~SA_POSITION_UPDATED;
1657                         Set_CCB_Type(start_ccb, SA_CCB_BUFFER_IO);
1658                         start_ccb->ccb_h.ccb_bp = bp;
1659                         bp = bufq_first(&softc->buf_queue);
1660                         crit_exit();
1661                         xpt_action(start_ccb);
1662                 }
1663                 
1664                 if (bp != NULL) {
1665                         /* Have more work to do, so ensure we stay scheduled */
1666                         xpt_schedule(periph, 1);
1667                 }
1668                 break;
1669         }
1670         case SA_STATE_ABNORMAL:
1671         default:
1672                 panic("state 0x%x in sastart", softc->state);
1673                 break;
1674         }
1675 }
1676
1677
1678 static void
1679 sadone(struct cam_periph *periph, union ccb *done_ccb)
1680 {
1681         struct sa_softc *softc;
1682         struct ccb_scsiio *csio;
1683
1684         softc = (struct sa_softc *)periph->softc;
1685         csio = &done_ccb->csio;
1686         switch (CCB_Type(csio)) {
1687         case SA_CCB_BUFFER_IO:
1688         {
1689                 struct buf *bp;
1690                 int error;
1691
1692                 softc->dsreg = MTIO_DSREG_REST;
1693                 bp = (struct buf *)done_ccb->ccb_h.ccb_bp;
1694                 error = 0;
1695                 if ((done_ccb->ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_CMP) {
1696                         if ((error = saerror(done_ccb, 0, 0)) == ERESTART) {
1697                                 /*
1698                                  * A retry was scheduled, so just return.
1699                                  */
1700                                 return;
1701                         }
1702                 }
1703
1704                 if (error == EIO) {
1705                         struct buf *q_bp;
1706
1707                         /*
1708                          * Catastrophic error. Mark the tape as frozen
1709                          * (we no longer know tape position).
1710                          *
1711                          * Return all queued I/O with EIO, and unfreeze
1712                          * our queue so that future transactions that
1713                          * attempt to fix this problem can get to the
1714                          * device.
1715                          *
1716                          */
1717
1718                         crit_enter();
1719                         softc->flags |= SA_FLAG_TAPE_FROZEN;
1720                         while ((q_bp = bufq_first(&softc->buf_queue)) != NULL) {
1721                                 bufq_remove(&softc->buf_queue, q_bp);
1722                                 q_bp->b_resid = q_bp->b_bcount;
1723                                 q_bp->b_error = EIO;
1724                                 q_bp->b_flags |= B_ERROR;
1725                                 biodone(q_bp);
1726                         }
1727                         crit_exit();
1728                 }
1729                 if (error != 0) {
1730                         bp->b_resid = bp->b_bcount;
1731                         bp->b_error = error;
1732                         bp->b_flags |= B_ERROR;
1733                         /*
1734                          * In the error case, position is updated in saerror.
1735                          */
1736                 } else {
1737                         bp->b_resid = csio->resid;
1738                         bp->b_error = 0;
1739                         if (csio->resid != 0) {
1740                                 bp->b_flags |= B_ERROR;
1741                         }
1742                         if ((bp->b_flags & B_READ) == 0) {
1743                                 softc->flags |= SA_FLAG_TAPE_WRITTEN;
1744                                 softc->filemarks = 0;
1745                         }
1746                         if (!(csio->ccb_h.ccb_pflags & SA_POSITION_UPDATED) &&
1747                             (softc->blkno != (daddr_t) -1)) {
1748                                 if ((softc->flags & SA_FLAG_FIXED) != 0) {
1749                                         u_int32_t l;
1750                                         if (softc->blk_shift != 0) {
1751                                                 l = bp->b_bcount >>
1752                                                         softc->blk_shift;
1753                                         } else {
1754                                                 l = bp->b_bcount /
1755                                                         softc->media_blksize;
1756                                         }
1757                                         softc->blkno += (daddr_t) l;
1758                                 } else {
1759                                         softc->blkno++;
1760                                 }
1761                         }
1762                 }
1763                 /*
1764                  * If we had an error (immediate or pending),
1765                  * release the device queue now.
1766                  */
1767                 if (error || (softc->flags & SA_FLAG_ERR_PENDING))
1768                         cam_release_devq(done_ccb->ccb_h.path, 0, 0, 0, 0);
1769 #ifdef  CAMDEBUG
1770                 if (error || bp->b_resid) {
1771                         CAM_DEBUG(periph->path, CAM_DEBUG_INFO,
1772                                   ("error %d resid %ld count %ld\n", error,
1773                                   bp->b_resid, bp->b_bcount));
1774                 }
1775 #endif
1776                 devstat_end_transaction_buf(&softc->device_stats, bp);
1777                 biodone(bp);
1778                 break;
1779         }
1780         case SA_CCB_WAITING:
1781         {
1782                 /* Caller will release the CCB */
1783                 wakeup(&done_ccb->ccb_h.cbfcnp);
1784                 return;
1785         }
1786         }
1787         xpt_release_ccb(done_ccb);
1788 }
1789
1790 /*
1791  * Mount the tape (make sure it's ready for I/O).
1792  */
1793 static int
1794 samount(struct cam_periph *periph, int oflags, dev_t dev)
1795 {
1796         struct  sa_softc *softc;
1797         union   ccb *ccb;
1798         int     error;
1799
1800         /*
1801          * oflags can be checked for 'kind' of open (read-only check) - later
1802          * dev can be checked for a control-mode or compression open - later
1803          */
1804         UNUSED_PARAMETER(oflags);
1805         UNUSED_PARAMETER(dev);
1806
1807
1808         softc = (struct sa_softc *)periph->softc;
1809
1810         /*
1811          * This should determine if something has happend since the last
1812          * open/mount that would invalidate the mount. We do *not* want
1813          * to retry this command- we just want the status. But we only
1814          * do this if we're mounted already- if we're not mounted,
1815          * we don't care about the unit read state and can instead use
1816          * this opportunity to attempt to reserve the tape unit.
1817          */
1818         
1819         if (softc->flags & SA_FLAG_TAPE_MOUNTED) {
1820                 ccb = cam_periph_getccb(periph, 1);
1821                 scsi_test_unit_ready(&ccb->csio, 0, sadone,
1822                     MSG_SIMPLE_Q_TAG, SSD_FULL_SIZE, IO_TIMEOUT);
1823                 error = cam_periph_runccb(ccb, saerror, 0, SF_NO_PRINT,
1824                     &softc->device_stats);
1825                 QFRLS(ccb);
1826                 if (error == ENXIO) {
1827                         softc->flags &= ~SA_FLAG_TAPE_MOUNTED;
1828                         scsi_test_unit_ready(&ccb->csio, 0, sadone,
1829                             MSG_SIMPLE_Q_TAG, SSD_FULL_SIZE, IO_TIMEOUT);
1830                         error = cam_periph_runccb(ccb, saerror, 0, SF_NO_PRINT,
1831                             &softc->device_stats);
1832                         QFRLS(ccb);
1833                 } else if (error) {
1834                         /*
1835                          * We don't need to freeze the tape because we
1836                          * will now attempt to rewind/load it.
1837                          */
1838                         softc->flags &= ~SA_FLAG_TAPE_MOUNTED;
1839                         if (CAM_DEBUGGED(ccb->ccb_h.path, CAM_DEBUG_INFO)) {
1840                                 xpt_print_path(ccb->ccb_h.path);
1841                                 printf("error %d on TUR in samount\n", error);
1842                         }
1843                 }
1844         } else {
1845                 error = sareservereleaseunit(periph, TRUE);
1846                 if (error) {
1847                         return (error);
1848                 }
1849                 ccb = cam_periph_getccb(periph, 1);
1850                 scsi_test_unit_ready(&ccb->csio, 0, sadone,
1851                     MSG_SIMPLE_Q_TAG, SSD_FULL_SIZE, IO_TIMEOUT);
1852                 error = cam_periph_runccb(ccb, saerror, 0, SF_NO_PRINT,
1853                     &softc->device_stats);
1854                 QFRLS(ccb);
1855         }
1856
1857         if ((softc->flags & SA_FLAG_TAPE_MOUNTED) == 0) {
1858                 struct scsi_read_block_limits_data *rblim = NULL;
1859                 int comp_enabled, comp_supported;
1860                 u_int8_t write_protect, guessing = 0;
1861
1862                 /*
1863                  * Clear out old state.
1864                  */
1865                 softc->flags &= ~(SA_FLAG_TAPE_WP|SA_FLAG_TAPE_WRITTEN|
1866                                   SA_FLAG_ERR_PENDING|SA_FLAG_COMP_ENABLED|
1867                                   SA_FLAG_COMP_SUPP|SA_FLAG_COMP_UNSUPP);
1868                 softc->filemarks = 0;
1869
1870                 /*
1871                  * *Very* first off, make sure we're loaded to BOT.
1872                  */
1873                 scsi_load_unload(&ccb->csio, 2, sadone, MSG_SIMPLE_Q_TAG, FALSE,
1874                     FALSE, FALSE, 1, SSD_FULL_SIZE, REWIND_TIMEOUT);
1875                 error = cam_periph_runccb(ccb, saerror, 0, SF_NO_PRINT,
1876                     &softc->device_stats);
1877                 QFRLS(ccb);
1878
1879                 /*
1880                  * In case this doesn't work, do a REWIND instead
1881                  */
1882                 if (error) {
1883                         scsi_rewind(&ccb->csio, 2, sadone, MSG_SIMPLE_Q_TAG,
1884                             FALSE, SSD_FULL_SIZE, REWIND_TIMEOUT);
1885                         error = cam_periph_runccb(ccb, saerror, 0, SF_NO_PRINT,
1886                                 &softc->device_stats);
1887                         QFRLS(ccb);
1888                 }
1889                 if (error) {
1890                         xpt_release_ccb(ccb);
1891                         goto exit;
1892                 }
1893
1894                 /*
1895                  * Do a dummy test read to force access to the
1896                  * media so that the drive will really know what's
1897                  * there. We actually don't really care what the
1898                  * blocksize on tape is and don't expect to really
1899                  * read a full record.
1900                  */
1901                 rblim = malloc(8192, M_TEMP, M_INTWAIT);
1902
1903                 if ((softc->quirks & SA_QUIRK_NODREAD) == 0) {
1904                         scsi_sa_read_write(&ccb->csio, 0, sadone,
1905                             MSG_SIMPLE_Q_TAG, 1, FALSE, 0, 8192,
1906                             (void *) rblim, 8192, SSD_FULL_SIZE,
1907                             IO_TIMEOUT);
1908                         (void) cam_periph_runccb(ccb, saerror, 0, SF_NO_PRINT,
1909                             &softc->device_stats);
1910                         QFRLS(ccb);
1911                         scsi_rewind(&ccb->csio, 1, sadone, MSG_SIMPLE_Q_TAG,
1912                             FALSE, SSD_FULL_SIZE, REWIND_TIMEOUT);
1913                         error = cam_periph_runccb(ccb, saerror, 0,
1914                             SF_NO_PRINT | SF_RETRY_SELTO | SF_RETRY_UA,
1915                             &softc->device_stats);
1916                         QFRLS(ccb);
1917                         if (error) {
1918                                 xpt_print_path(ccb->ccb_h.path);
1919                                 printf("unable to rewind after test read\n");
1920                                 xpt_release_ccb(ccb);
1921                                 goto exit;
1922                         }
1923                 }
1924
1925                 /*
1926                  * Next off, determine block limits.
1927                  */
1928                 scsi_read_block_limits(&ccb->csio, 5, sadone, MSG_SIMPLE_Q_TAG,
1929                     rblim, SSD_FULL_SIZE, SCSIOP_TIMEOUT);
1930
1931                 error = cam_periph_runccb(ccb, saerror, 0,
1932                     SF_NO_PRINT | SF_RETRY_UA | SF_RETRY_SELTO,
1933                     &softc->device_stats);
1934                 QFRLS(ccb);
1935                 xpt_release_ccb(ccb);
1936
1937                 if (error != 0) {
1938                         /*
1939                          * If it's less than SCSI-2, READ BLOCK LIMITS is not
1940                          * a MANDATORY command. Anyway- it doesn't matter-
1941                          * we can proceed anyway.
1942                          */
1943                         softc->blk_gran = 0;
1944                         softc->max_blk = ~0;
1945                         softc->min_blk = 0;
1946                 } else {
1947                         if (softc->scsi_rev >= SCSI_REV_3) {
1948                                 softc->blk_gran = RBL_GRAN(rblim);
1949                         } else {
1950                                 softc->blk_gran = 0;
1951                         }
1952                         /*
1953                          * We take max_blk == min_blk to mean a default to
1954                          * fixed mode- but note that whatever we get out of
1955                          * sagetparams below will actually determine whether
1956                          * we are actually *in* fixed mode.
1957                          */
1958                         softc->max_blk = scsi_3btoul(rblim->maximum);
1959                         softc->min_blk = scsi_2btoul(rblim->minimum);
1960
1961
1962                 }
1963                 /*
1964                  * Next, perform a mode sense to determine
1965                  * current density, blocksize, compression etc.
1966                  */
1967                 error = sagetparams(periph, SA_PARAM_ALL,
1968                                     &softc->media_blksize,
1969                                     &softc->media_density,
1970                                     &softc->media_numblks,
1971                                     &softc->buffer_mode, &write_protect,
1972                                     &softc->speed, &comp_supported,
1973                                     &comp_enabled, &softc->comp_algorithm,
1974                                     NULL);
1975
1976                 if (error != 0) {
1977                         /*
1978                          * We could work a little harder here. We could
1979                          * adjust our attempts to get information. It
1980                          * might be an ancient tape drive. If someone
1981                          * nudges us, we'll do that.
1982                          */
1983                         goto exit;
1984                 }
1985
1986                 /*
1987                  * If no quirk has determined that this is a device that is
1988                  * preferred to be in fixed or variable mode, now is the time
1989                  * to find out.
1990                  */
1991                 if ((softc->quirks & (SA_QUIRK_FIXED|SA_QUIRK_VARIABLE)) == 0) {
1992                         guessing = 1;
1993                         /*
1994                          * This could be expensive to find out. Luckily we
1995                          * only need to do this once. If we start out in
1996                          * 'default' mode, try and set ourselves to one
1997                          * of the densities that would determine a wad
1998                          * of other stuff. Go from highest to lowest.
1999                          */
2000                         if (softc->media_density == SCSI_DEFAULT_DENSITY) {
2001                                 int i;
2002                                 static u_int8_t ctry[] = {
2003                                         SCSI_DENSITY_HALFINCH_PE,
2004                                         SCSI_DENSITY_HALFINCH_6250C,
2005                                         SCSI_DENSITY_HALFINCH_6250,
2006                                         SCSI_DENSITY_HALFINCH_1600,
2007                                         SCSI_DENSITY_HALFINCH_800,
2008                                         SCSI_DENSITY_QIC_4GB,
2009                                         SCSI_DENSITY_QIC_2GB,
2010                                         SCSI_DENSITY_QIC_525_320,
2011                                         SCSI_DENSITY_QIC_150,
2012                                         SCSI_DENSITY_QIC_120,
2013                                         SCSI_DENSITY_QIC_24,
2014                                         SCSI_DENSITY_QIC_11_9TRK,
2015                                         SCSI_DENSITY_QIC_11_4TRK,
2016                                         SCSI_DENSITY_QIC_1320,
2017                                         SCSI_DENSITY_QIC_3080,
2018                                         0
2019                                 };
2020                                 for (i = 0; ctry[i]; i++) {
2021                                         error = sasetparams(periph,
2022                                             SA_PARAM_DENSITY, 0, ctry[i],
2023                                             0, SF_NO_PRINT);
2024                                         if (error == 0) {
2025                                                 softc->media_density = ctry[i];
2026                                                 break;
2027                                         }
2028                                 }
2029                         }
2030                         switch (softc->media_density) {
2031                         case SCSI_DENSITY_QIC_11_4TRK:
2032                         case SCSI_DENSITY_QIC_11_9TRK:
2033                         case SCSI_DENSITY_QIC_24:
2034                         case SCSI_DENSITY_QIC_120:
2035                         case SCSI_DENSITY_QIC_150:
2036                         case SCSI_DENSITY_QIC_525_320:
2037                         case SCSI_DENSITY_QIC_1320:
2038                         case SCSI_DENSITY_QIC_3080:
2039                                 softc->quirks &= ~SA_QUIRK_2FM;
2040                                 softc->quirks |= SA_QUIRK_FIXED|SA_QUIRK_1FM;
2041                                 softc->last_media_blksize = 512;
2042                                 break;
2043                         case SCSI_DENSITY_QIC_4GB:
2044                         case SCSI_DENSITY_QIC_2GB:
2045                                 softc->quirks &= ~SA_QUIRK_2FM;
2046                                 softc->quirks |= SA_QUIRK_FIXED|SA_QUIRK_1FM;
2047                                 softc->last_media_blksize = 1024;
2048                                 break;
2049                         default:
2050                                 softc->last_media_blksize =
2051                                     softc->media_blksize;
2052                                 softc->quirks |= SA_QUIRK_VARIABLE;
2053                                 break;
2054                         }
2055                 }
2056
2057                 /*
2058                  * If no quirk has determined that this is a device that needs
2059                  * to have 2 Filemarks at EOD, now is the time to find out.
2060                  */
2061
2062                 if ((softc->quirks & SA_QUIRK_2FM) == 0) {
2063                         switch (softc->media_density) {
2064                         case SCSI_DENSITY_HALFINCH_800:
2065                         case SCSI_DENSITY_HALFINCH_1600:
2066                         case SCSI_DENSITY_HALFINCH_6250:
2067                         case SCSI_DENSITY_HALFINCH_6250C:
2068                         case SCSI_DENSITY_HALFINCH_PE:
2069                                 softc->quirks &= ~SA_QUIRK_1FM;
2070                                 softc->quirks |= SA_QUIRK_2FM;
2071                                 break;
2072                         default:
2073                                 break;
2074                         }
2075                 }
2076
2077                 /*
2078                  * Now validate that some info we got makes sense.
2079                  */
2080                 if ((softc->max_blk < softc->media_blksize) ||
2081                     (softc->min_blk > softc->media_blksize &&
2082                     softc->media_blksize)) {
2083                         xpt_print_path(ccb->ccb_h.path);
2084                         printf("BLOCK LIMITS (%d..%d) could not match current "
2085                             "block settings (%d)- adjusting\n", softc->min_blk,
2086                             softc->max_blk, softc->media_blksize);
2087                         softc->max_blk = softc->min_blk =
2088                             softc->media_blksize;
2089                 }
2090
2091                 /*
2092                  * Now put ourselves into the right frame of mind based
2093                  * upon quirks...
2094                  */
2095 tryagain:
2096                 /*
2097                  * If we want to be in FIXED mode and our current blocksize
2098                  * is not equal to our last blocksize (if nonzero), try and
2099                  * set ourselves to this last blocksize (as the 'preferred'
2100                  * block size).  The initial quirkmatch at registry sets the
2101                  * initial 'last' blocksize. If, for whatever reason, this
2102                  * 'last' blocksize is zero, set the blocksize to 512,
2103                  * or min_blk if that's larger.
2104                  */
2105                 if ((softc->quirks & SA_QUIRK_FIXED) &&
2106                     (softc->quirks & SA_QUIRK_NO_MODESEL) == 0 &&
2107                     (softc->media_blksize != softc->last_media_blksize)) {
2108                         softc->media_blksize = softc->last_media_blksize;
2109                         if (softc->media_blksize == 0) {
2110                                 softc->media_blksize = 512;
2111                                 if (softc->media_blksize < softc->min_blk) {
2112                                         softc->media_blksize = softc->min_blk;
2113                                 }
2114                         }
2115                         error = sasetparams(periph, SA_PARAM_BLOCKSIZE,
2116                             softc->media_blksize, 0, 0, SF_NO_PRINT);
2117                         if (error) {
2118                                 xpt_print_path(ccb->ccb_h.path);
2119                                 printf("unable to set fixed blocksize to %d\n",
2120                                      softc->media_blksize);
2121                                 goto exit;
2122                         }
2123                 }
2124
2125                 if ((softc->quirks & SA_QUIRK_VARIABLE) && 
2126                     (softc->media_blksize != 0)) {
2127                         softc->last_media_blksize = softc->media_blksize;
2128                         softc->media_blksize = 0;
2129                         error = sasetparams(periph, SA_PARAM_BLOCKSIZE,
2130                             0, 0, 0, SF_NO_PRINT);
2131                         if (error) {
2132                                 /*
2133                                  * If this fails and we were guessing, just
2134                                  * assume that we got it wrong and go try
2135                                  * fixed block mode. Don't even check against
2136                                  * density code at this point.
2137                                  */
2138                                 if (guessing) {
2139                                         softc->quirks &= ~SA_QUIRK_VARIABLE;
2140                                         softc->quirks |= SA_QUIRK_FIXED;
2141                                         if (softc->last_media_blksize == 0)
2142                                                 softc->last_media_blksize = 512;
2143                                         goto tryagain;
2144                                 }
2145                                 xpt_print_path(ccb->ccb_h.path);
2146                                 printf("unable to set variable blocksize\n");
2147                                 goto exit;
2148                         }
2149                 }
2150
2151                 /*
2152                  * Now that we have the current block size,
2153                  * set up some parameters for sastart's usage.
2154                  */
2155                 if (softc->media_blksize) {
2156                         softc->flags |= SA_FLAG_FIXED;
2157                         if (powerof2(softc->media_blksize)) {
2158                                 softc->blk_shift =
2159                                     ffs(softc->media_blksize) - 1;
2160                                 softc->blk_mask = softc->media_blksize - 1;
2161                         } else {
2162                                 softc->blk_mask = ~0;
2163                                 softc->blk_shift = 0;
2164                         }
2165                 } else {
2166                         /*
2167                          * The SCSI-3 spec allows 0 to mean "unspecified".
2168                          * The SCSI-1 spec allows 0 to mean 'infinite'.
2169                          *
2170                          * Either works here.
2171                          */
2172                         if (softc->max_blk == 0) {
2173                                 softc->max_blk = ~0;
2174                         }
2175                         softc->blk_shift = 0;
2176                         if (softc->blk_gran != 0) {
2177                                 softc->blk_mask = softc->blk_gran - 1;
2178                         } else {
2179                                 softc->blk_mask = 0;
2180                         }
2181                 }
2182
2183                 if (write_protect) 
2184                         softc->flags |= SA_FLAG_TAPE_WP;
2185
2186                 if (comp_supported) {
2187                         if (softc->saved_comp_algorithm == 0)
2188                                 softc->saved_comp_algorithm =
2189                                     softc->comp_algorithm;
2190                         softc->flags |= SA_FLAG_COMP_SUPP;
2191                         if (comp_enabled)
2192                                 softc->flags |= SA_FLAG_COMP_ENABLED;
2193                 } else
2194                         softc->flags |= SA_FLAG_COMP_UNSUPP;
2195
2196                 if ((softc->buffer_mode == SMH_SA_BUF_MODE_NOBUF) &&
2197                     (softc->quirks & SA_QUIRK_NO_MODESEL) == 0) {
2198                         error = sasetparams(periph, SA_PARAM_BUFF_MODE, 0,
2199                             0, 0, SF_NO_PRINT);
2200                         if (error == 0) {
2201                                 softc->buffer_mode = SMH_SA_BUF_MODE_SIBUF;
2202                         } else {
2203                                 xpt_print_path(ccb->ccb_h.path);
2204                                 printf("unable to set buffered mode\n");
2205                         }
2206                         error = 0;      /* not an error */
2207                 }
2208
2209
2210                 if (error == 0) {
2211                         softc->flags |= SA_FLAG_TAPE_MOUNTED;
2212                 }
2213 exit:
2214                 if (rblim != NULL)
2215                         free(rblim, M_TEMP);
2216
2217                 if (error != 0) {
2218                         softc->dsreg = MTIO_DSREG_NIL;
2219                 } else {
2220                         softc->fileno = softc->blkno = 0;
2221                         softc->dsreg = MTIO_DSREG_REST;
2222                 }
2223 #ifdef  SA_1FM_AT_EOD
2224                 if ((softc->quirks & SA_QUIRK_2FM) == 0)
2225                         softc->quirks |= SA_QUIRK_1FM;
2226 #else
2227                 if ((softc->quirks & SA_QUIRK_1FM) == 0)
2228                         softc->quirks |= SA_QUIRK_2FM;
2229 #endif
2230         } else
2231                 xpt_release_ccb(ccb);
2232
2233         /*
2234          * If we return an error, we're not mounted any more,
2235          * so release any device reservation.
2236          */
2237         if (error != 0) {
2238                 (void) sareservereleaseunit(periph, FALSE);
2239         } else {
2240                 /*
2241                  * Clear I/O residual.
2242                  */
2243                 softc->last_io_resid = 0;
2244                 softc->last_ctl_resid = 0;
2245         }
2246         return (error);
2247 }
2248
2249 /*
2250  * How many filemarks do we need to write if we were to terminate the
2251  * tape session right now? Note that this can be a negative number
2252  */
2253
2254 static int
2255 samarkswanted(struct cam_periph *periph)
2256 {
2257         int     markswanted;
2258         struct  sa_softc *softc;
2259
2260         softc = (struct sa_softc *)periph->softc;
2261         markswanted = 0;
2262         if ((softc->flags & SA_FLAG_TAPE_WRITTEN) != 0) {
2263                 markswanted++;
2264                 if (softc->quirks & SA_QUIRK_2FM)
2265                         markswanted++;
2266         }
2267         markswanted -= softc->filemarks;
2268         return (markswanted);
2269 }
2270
2271 static int
2272 sacheckeod(struct cam_periph *periph)
2273 {
2274         int     error;
2275         int     markswanted;
2276         struct  sa_softc *softc;
2277
2278         softc = (struct sa_softc *)periph->softc;
2279         markswanted = samarkswanted(periph);
2280
2281         if (markswanted > 0) {
2282                 error = sawritefilemarks(periph, markswanted, FALSE);
2283         } else {
2284                 error = 0;
2285         }
2286         return (error);
2287 }
2288
2289 static int
2290 saerror(union ccb *ccb, u_int32_t cflgs, u_int32_t sflgs)
2291 {
2292         static const char *toobig =
2293             "%d-byte tape record bigger than supplied buffer\n";
2294         struct  cam_periph *periph;
2295         struct  sa_softc *softc;
2296         struct  ccb_scsiio *csio;
2297         struct  scsi_sense_data *sense;
2298         u_int32_t resid = 0;
2299         int32_t info = 0;
2300         cam_status status;
2301         int error_code, sense_key, asc, ascq, error, aqvalid;
2302
2303         periph = xpt_path_periph(ccb->ccb_h.path);
2304         softc = (struct sa_softc *)periph->softc;
2305         csio = &ccb->csio;
2306         sense = &csio->sense_data;
2307         scsi_extract_sense(sense, &error_code, &sense_key, &asc, &ascq);
2308         aqvalid = sense->extra_len >= 6;
2309         error = 0;
2310
2311         status = csio->ccb_h.status & CAM_STATUS_MASK;
2312
2313         /*
2314          * Calculate/latch up, any residuals... We do this in a funny 2-step
2315          * so we can print stuff here if we have CAM_DEBUG enabled for this
2316          * unit.
2317          */
2318         if (status == CAM_SCSI_STATUS_ERROR) {
2319                 if ((sense->error_code & SSD_ERRCODE_VALID) != 0) {
2320                         info = (int32_t) scsi_4btoul(sense->info);
2321                         resid = info;
2322                         if ((softc->flags & SA_FLAG_FIXED) != 0)
2323                                 resid *= softc->media_blksize;
2324                 } else {
2325                         resid = csio->dxfer_len;
2326                         info = resid;
2327                         if ((softc->flags & SA_FLAG_FIXED) != 0) {
2328                                 if (softc->media_blksize)
2329                                         info /= softc->media_blksize;
2330                         }
2331                 }
2332                 if (CCB_Type(csio) == SA_CCB_BUFFER_IO) {
2333                         bcopy((caddr_t) sense, (caddr_t) &softc->last_io_sense,
2334                             sizeof (struct scsi_sense_data));
2335                         bcopy(csio->cdb_io.cdb_bytes, softc->last_io_cdb,
2336                             (int) csio->cdb_len);
2337                         softc->last_io_resid = resid;
2338                         softc->last_resid_was_io = 1;
2339                 } else {
2340                         bcopy((caddr_t) sense, (caddr_t) &softc->last_ctl_sense,
2341                             sizeof (struct scsi_sense_data));
2342                         bcopy(csio->cdb_io.cdb_bytes, softc->last_ctl_cdb,
2343                             (int) csio->cdb_len);
2344                         softc->last_ctl_resid = resid;
2345                         softc->last_resid_was_io = 0;
2346                 }
2347                 CAM_DEBUG(periph->path, CAM_DEBUG_INFO, ("CDB[0]=0x%x Key 0x%x "
2348                     "ASC/ASCQ 0x%x/0x%x CAM STATUS 0x%x flags 0x%x resid %d "
2349                     "dxfer_len %d\n", csio->cdb_io.cdb_bytes[0] & 0xff,
2350                     sense_key, asc, ascq, status,
2351                     sense->flags & ~SSD_KEY_RESERVED, resid, csio->dxfer_len));
2352         } else {
2353                 CAM_DEBUG(periph->path, CAM_DEBUG_INFO,
2354                     ("Cam Status 0x%x\n", status));
2355         }
2356
2357         switch (status) {
2358         case CAM_REQ_CMP:
2359                 return (0);
2360         case CAM_SCSI_STATUS_ERROR:
2361                 /*
2362                  * If a read/write command, we handle it here.
2363                  */
2364                 if (CCB_Type(csio) != SA_CCB_WAITING) {
2365                         break;
2366                 }
2367                 /*
2368                  * If this was just EOM/EOP, Filemark, Setmark or ILI detected
2369                  * on a non read/write command, we assume it's not an error
2370                  * and propagate the residule and return.
2371                  */
2372                 if ((aqvalid && asc == 0 && ascq > 0 && ascq <= 5) ||
2373                     (aqvalid == 0 && sense_key == SSD_KEY_NO_SENSE)) {
2374                         csio->resid = resid;
2375                         QFRLS(ccb);
2376                         return (0);
2377                 }
2378                 /*
2379                  * Otherwise, we let the common code handle this.
2380                  */
2381                 return (cam_periph_error(ccb, cflgs, sflgs, &softc->saved_ccb));
2382
2383         /*
2384          * XXX: To Be Fixed
2385          * We cannot depend upon CAM honoring retry counts for these.
2386          */
2387         case CAM_SCSI_BUS_RESET:
2388         case CAM_BDR_SENT:
2389                 if (ccb->ccb_h.retry_count <= 0) {
2390                         return (EIO);
2391                         break;
2392                 }
2393                 /* FALLTHROUGH */
2394         default:
2395                 return (cam_periph_error(ccb, cflgs, sflgs, &softc->saved_ccb));
2396         }
2397
2398         /*
2399          * Handle filemark, end of tape, mismatched record sizes....
2400          * From this point out, we're only handling read/write cases.
2401          * Handle writes && reads differently.
2402          */
2403
2404         if (csio->cdb_io.cdb_bytes[0] == SA_WRITE) {
2405                 if (sense_key == SSD_KEY_VOLUME_OVERFLOW) {
2406                         csio->resid = resid;
2407                         error = ENOSPC;
2408                 } else if (sense->flags & SSD_EOM) {
2409                         softc->flags |= SA_FLAG_EOM_PENDING;
2410                         /*
2411                          * Grotesque as it seems, the few times
2412                          * I've actually seen a non-zero resid,
2413                          * the tape drive actually lied and had
2414                          * writtent all the data!.
2415                          */
2416                         csio->resid = 0;
2417                 }
2418         } else {
2419                 csio->resid = resid;
2420                 if (sense_key == SSD_KEY_BLANK_CHECK) {
2421                         if (softc->quirks & SA_QUIRK_1FM) {
2422                                 error = 0;
2423                                 softc->flags |= SA_FLAG_EOM_PENDING;
2424                         } else {
2425                                 error = EIO;
2426                         }
2427                 } else if (sense->flags & SSD_FILEMARK) {
2428                         if (softc->flags & SA_FLAG_FIXED) {
2429                                 error = -1;
2430                                 softc->flags |= SA_FLAG_EOF_PENDING;
2431                         }
2432                         /*
2433                          * Unconditionally, if we detected a filemark on a read,
2434                          * mark that we've run moved a file ahead.
2435                          */
2436                         if (softc->fileno != (daddr_t) -1) {
2437                                 softc->fileno++;
2438                                 softc->blkno = 0;
2439                                 csio->ccb_h.ccb_pflags |= SA_POSITION_UPDATED;
2440                         }
2441                 }
2442         }
2443
2444         /*
2445          * Incorrect Length usually applies to read, but can apply to writes.
2446          */
2447         if (error == 0 && (sense->flags & SSD_ILI)) {
2448                 if (info < 0) {
2449                         xpt_print_path(csio->ccb_h.path);
2450                         printf(toobig, csio->dxfer_len - info);
2451                         csio->resid = csio->dxfer_len;
2452                         error = EIO;
2453                 } else {
2454                         csio->resid = resid;
2455                         if (softc->flags & SA_FLAG_FIXED) {
2456                                 softc->flags |= SA_FLAG_EIO_PENDING;
2457                         }
2458                         /*
2459                          * Bump the block number if we hadn't seen a filemark.
2460                          * Do this independent of errors (we've moved anyway).
2461                          */
2462                         if ((sense->flags & SSD_FILEMARK) == 0) {
2463                                 if (softc->blkno != (daddr_t) -1) {
2464                                         softc->blkno++;
2465                                         csio->ccb_h.ccb_pflags |=
2466                                            SA_POSITION_UPDATED;
2467                                 }
2468                         }
2469                 }
2470         }
2471
2472         if (error <= 0) {
2473                 /*
2474                  * Unfreeze the queue if frozen as we're not returning anything
2475                  * to our waiters that would indicate an I/O error has occurred
2476                  * (yet).
2477                  */
2478                 QFRLS(ccb);
2479                 error = 0;
2480         }
2481         return (error);
2482 }
2483
2484 static int
2485 sagetparams(struct cam_periph *periph, sa_params params_to_get,
2486             u_int32_t *blocksize, u_int8_t *density, u_int32_t *numblocks,
2487             int *buff_mode, u_int8_t *write_protect, u_int8_t *speed,
2488             int *comp_supported, int *comp_enabled, u_int32_t *comp_algorithm,
2489             sa_comp_t *tcs)
2490 {
2491         union ccb *ccb;
2492         void *mode_buffer;
2493         struct scsi_mode_header_6 *mode_hdr;
2494         struct scsi_mode_blk_desc *mode_blk;
2495         int mode_buffer_len;
2496         struct sa_softc *softc;
2497         u_int8_t cpage;
2498         int error;
2499         cam_status status;
2500
2501         softc = (struct sa_softc *)periph->softc;
2502         ccb = cam_periph_getccb(periph, 1);
2503         if (softc->quirks & SA_QUIRK_NO_CPAGE)
2504                 cpage = SA_DEVICE_CONFIGURATION_PAGE;
2505         else
2506                 cpage = SA_DATA_COMPRESSION_PAGE;
2507
2508 retry:
2509         mode_buffer_len = sizeof(*mode_hdr) + sizeof(*mode_blk);
2510
2511         if (params_to_get & SA_PARAM_COMPRESSION) {
2512                 if (softc->quirks & SA_QUIRK_NOCOMP) {
2513                         *comp_supported = FALSE;
2514                         params_to_get &= ~SA_PARAM_COMPRESSION;
2515                 } else
2516                         mode_buffer_len += sizeof (sa_comp_t);
2517         }
2518
2519         mode_buffer = malloc(mode_buffer_len, M_TEMP, M_INTWAIT | M_ZERO);
2520         mode_hdr = (struct scsi_mode_header_6 *)mode_buffer;
2521         mode_blk = (struct scsi_mode_blk_desc *)&mode_hdr[1];
2522
2523         /* it is safe to retry this */
2524         scsi_mode_sense(&ccb->csio, 5, sadone, MSG_SIMPLE_Q_TAG, FALSE,
2525             SMS_PAGE_CTRL_CURRENT, (params_to_get & SA_PARAM_COMPRESSION) ?
2526             cpage : SMS_VENDOR_SPECIFIC_PAGE, mode_buffer, mode_buffer_len,
2527             SSD_FULL_SIZE, SCSIOP_TIMEOUT);
2528
2529         error = cam_periph_runccb(ccb, saerror, 0, SF_NO_PRINT,
2530             &softc->device_stats);
2531         QFRLS(ccb);
2532
2533         status = ccb->ccb_h.status & CAM_STATUS_MASK;
2534
2535         if (error == EINVAL && (params_to_get & SA_PARAM_COMPRESSION) != 0) {
2536                 /*
2537                  * Hmm. Let's see if we can try another page...
2538                  * If we've already done that, give up on compression
2539                  * for this device and remember this for the future
2540                  * and attempt the request without asking for compression
2541                  * info.
2542                  */
2543                 if (cpage == SA_DATA_COMPRESSION_PAGE) {
2544                         cpage = SA_DEVICE_CONFIGURATION_PAGE;
2545                         goto retry;
2546                 }
2547                 softc->quirks |= SA_QUIRK_NOCOMP;
2548                 free(mode_buffer, M_TEMP);
2549                 goto retry;
2550         } else if (status == CAM_SCSI_STATUS_ERROR) {
2551                 /* Tell the user about the fatal error. */
2552                 scsi_sense_print(&ccb->csio);
2553                 goto sagetparamsexit;
2554         }
2555
2556         /*
2557          * If the user only wants the compression information, and
2558          * the device doesn't send back the block descriptor, it's
2559          * no big deal.  If the user wants more than just
2560          * compression, though, and the device doesn't pass back the
2561          * block descriptor, we need to send another mode sense to
2562          * get the block descriptor.
2563          */
2564         if ((mode_hdr->blk_desc_len == 0) &&
2565             (params_to_get & SA_PARAM_COMPRESSION) &&
2566             (params_to_get & ~(SA_PARAM_COMPRESSION))) {
2567
2568                 /*
2569                  * Decrease the mode buffer length by the size of
2570                  * the compression page, to make sure the data
2571                  * there doesn't get overwritten.
2572                  */
2573                 mode_buffer_len -= sizeof (sa_comp_t);
2574
2575                 /*
2576                  * Now move the compression page that we presumably
2577                  * got back down the memory chunk a little bit so
2578                  * it doesn't get spammed.
2579                  */
2580                 bcopy(&mode_hdr[0], &mode_hdr[1], sizeof (sa_comp_t));
2581                 bzero(&mode_hdr[0], sizeof (mode_hdr[0]));
2582
2583                 /*
2584                  * Now, we issue another mode sense and just ask
2585                  * for the block descriptor, etc.
2586                  */
2587
2588                 scsi_mode_sense(&ccb->csio, 2, sadone, MSG_SIMPLE_Q_TAG, FALSE,
2589                     SMS_PAGE_CTRL_CURRENT, SMS_VENDOR_SPECIFIC_PAGE,
2590                     mode_buffer, mode_buffer_len, SSD_FULL_SIZE,
2591                     SCSIOP_TIMEOUT);
2592
2593                 error = cam_periph_runccb(ccb, saerror, 0, SF_NO_PRINT,
2594                     &softc->device_stats);
2595                 QFRLS(ccb);
2596
2597                 if (error != 0)
2598                         goto sagetparamsexit;
2599         }
2600
2601         if (params_to_get & SA_PARAM_BLOCKSIZE)
2602                 *blocksize = scsi_3btoul(mode_blk->blklen);
2603
2604         if (params_to_get & SA_PARAM_NUMBLOCKS)
2605                 *numblocks = scsi_3btoul(mode_blk->nblocks);
2606
2607         if (params_to_get & SA_PARAM_BUFF_MODE)
2608                 *buff_mode = mode_hdr->dev_spec & SMH_SA_BUF_MODE_MASK;
2609
2610         if (params_to_get & SA_PARAM_DENSITY)
2611                 *density = mode_blk->density;
2612
2613         if (params_to_get & SA_PARAM_WP)
2614                 *write_protect = (mode_hdr->dev_spec & SMH_SA_WP)? TRUE : FALSE;
2615
2616         if (params_to_get & SA_PARAM_SPEED)
2617                 *speed = mode_hdr->dev_spec & SMH_SA_SPEED_MASK;
2618
2619         if (params_to_get & SA_PARAM_COMPRESSION) {
2620                 sa_comp_t *ntcs = (sa_comp_t *) &mode_blk[1];
2621                 if (cpage == SA_DATA_COMPRESSION_PAGE) {
2622                         struct scsi_data_compression_page *cp = &ntcs->dcomp;
2623                         *comp_supported =
2624                             (cp->dce_and_dcc & SA_DCP_DCC)? TRUE : FALSE;
2625                         *comp_enabled =
2626                             (cp->dce_and_dcc & SA_DCP_DCE)? TRUE : FALSE;
2627                         *comp_algorithm = scsi_4btoul(cp->comp_algorithm);
2628                 } else {
2629                         struct scsi_dev_conf_page *cp = &ntcs->dconf;
2630                         /*
2631                          * We don't really know whether this device supports
2632                          * Data Compression if the the algorithm field is
2633                          * zero. Just say we do.
2634                          */
2635                         *comp_supported = TRUE;
2636                         *comp_enabled =
2637                             (cp->sel_comp_alg != SA_COMP_NONE)? TRUE : FALSE;
2638                         *comp_algorithm = cp->sel_comp_alg;
2639                 }
2640                 if (tcs != NULL)
2641                         bcopy(ntcs, tcs, sizeof (sa_comp_t));
2642         }
2643
2644         if (CAM_DEBUGGED(periph->path, CAM_DEBUG_INFO)) {
2645                 int idx;
2646                 char *xyz = mode_buffer;
2647                 xpt_print_path(periph->path);
2648                 printf("Mode Sense Data=");
2649                 for (idx = 0; idx < mode_buffer_len; idx++)
2650                         printf(" 0x%02x", xyz[idx] & 0xff);
2651                 printf("\n");
2652         }
2653
2654 sagetparamsexit:
2655
2656         xpt_release_ccb(ccb);
2657         free(mode_buffer, M_TEMP);
2658         return (error);
2659 }
2660
2661 /*
2662  * The purpose of this function is to set one of four different parameters
2663  * for a tape drive:
2664  *      - blocksize
2665  *      - density
2666  *      - compression / compression algorithm
2667  *      - buffering mode
2668  *
2669  * The assumption is that this will be called from saioctl(), and therefore
2670  * from a process context.  Thus the waiting malloc calls below.  If that
2671  * assumption ever changes, the malloc calls should be changed to be
2672  * NOWAIT mallocs.
2673  *
2674  * Any or all of the four parameters may be set when this function is
2675  * called.  It should handle setting more than one parameter at once.
2676  */
2677 static int
2678 sasetparams(struct cam_periph *periph, sa_params params_to_set,
2679             u_int32_t blocksize, u_int8_t density, u_int32_t calg,
2680             u_int32_t sense_flags)
2681 {
2682         struct sa_softc *softc;
2683         u_int32_t current_blocksize;
2684         u_int32_t current_calg;
2685         u_int8_t current_density;
2686         u_int8_t current_speed;
2687         int comp_enabled, comp_supported;
2688         void *mode_buffer;
2689         int mode_buffer_len;
2690         struct scsi_mode_header_6 *mode_hdr;
2691         struct scsi_mode_blk_desc *mode_blk;
2692         sa_comp_t *ccomp, *cpage;
2693         int buff_mode;
2694         union ccb *ccb = NULL;
2695         int error;
2696
2697         softc = (struct sa_softc *)periph->softc;
2698
2699         ccomp = malloc(sizeof (sa_comp_t), M_TEMP, M_INTWAIT);
2700
2701         /*
2702          * Since it doesn't make sense to set the number of blocks, or
2703          * write protection, we won't try to get the current value.  We
2704          * always want to get the blocksize, so we can set it back to the
2705          * proper value.
2706          */
2707         error = sagetparams(periph,
2708             params_to_set | SA_PARAM_BLOCKSIZE | SA_PARAM_SPEED,
2709             &current_blocksize, &current_density, NULL, &buff_mode, NULL,
2710             &current_speed, &comp_supported, &comp_enabled,
2711             &current_calg, ccomp);
2712
2713         if (error != 0) {
2714                 free(ccomp, M_TEMP);
2715                 return (error);
2716         }
2717
2718         mode_buffer_len = sizeof(*mode_hdr) + sizeof(*mode_blk);
2719         if (params_to_set & SA_PARAM_COMPRESSION)
2720                 mode_buffer_len += sizeof (sa_comp_t);
2721
2722         mode_buffer = malloc(mode_buffer_len, M_TEMP, M_INTWAIT | M_ZERO);
2723
2724         mode_hdr = (struct scsi_mode_header_6 *)mode_buffer;
2725         mode_blk = (struct scsi_mode_blk_desc *)&mode_hdr[1];
2726
2727         ccb = cam_periph_getccb(periph, 1);
2728
2729 retry:
2730
2731         if (params_to_set & SA_PARAM_COMPRESSION) {
2732                 if (mode_blk) {
2733                         cpage = (sa_comp_t *)&mode_blk[1];
2734                 } else {
2735                         cpage = (sa_comp_t *)&mode_hdr[1];
2736                 }
2737                 bcopy(ccomp, cpage, sizeof (sa_comp_t));
2738                 cpage->hdr.pagecode &= ~0x80;
2739         } else
2740                 cpage = NULL;
2741
2742         /*
2743          * If the caller wants us to set the blocksize, use the one they
2744          * pass in.  Otherwise, use the blocksize we got back from the
2745          * mode select above.
2746          */
2747         if (mode_blk) {
2748                 if (params_to_set & SA_PARAM_BLOCKSIZE)
2749                         scsi_ulto3b(blocksize, mode_blk->blklen);
2750                 else
2751                         scsi_ulto3b(current_blocksize, mode_blk->blklen);
2752
2753                 /*
2754                  * Set density if requested, else preserve old density.
2755                  * SCSI_SAME_DENSITY only applies to SCSI-2 or better
2756                  * devices, else density we've latched up in our softc.
2757                  */
2758                 if (params_to_set & SA_PARAM_DENSITY) {
2759                         mode_blk->density = density;
2760                 } else if (softc->scsi_rev > SCSI_REV_CCS) {
2761                         mode_blk->density = SCSI_SAME_DENSITY;
2762                 } else {
2763                         mode_blk->density = softc->media_density;
2764                 }
2765         }
2766
2767         /*
2768          * For mode selects, these two fields must be zero.
2769          */
2770         mode_hdr->data_length = 0;
2771         mode_hdr->medium_type = 0;
2772
2773         /* set the speed to the current value */
2774         mode_hdr->dev_spec = current_speed;
2775
2776         /* set single-initiator buffering mode */
2777         mode_hdr->dev_spec |= SMH_SA_BUF_MODE_SIBUF;
2778
2779         if (mode_blk)
2780                 mode_hdr->blk_desc_len = sizeof(struct scsi_mode_blk_desc);
2781         else
2782                 mode_hdr->blk_desc_len = 0;
2783
2784         /*
2785          * First, if the user wants us to set the compression algorithm or
2786          * just turn compression on, check to make sure that this drive
2787          * supports compression.
2788          */
2789         if (params_to_set & SA_PARAM_COMPRESSION) {
2790                 /*
2791                  * If the compression algorithm is 0, disable compression.
2792                  * If the compression algorithm is non-zero, enable
2793                  * compression and set the compression type to the
2794                  * specified compression algorithm, unless the algorithm is
2795                  * MT_COMP_ENABLE.  In that case, we look at the
2796                  * compression algorithm that is currently set and if it is
2797                  * non-zero, we leave it as-is.  If it is zero, and we have
2798                  * saved a compression algorithm from a time when
2799                  * compression was enabled before, set the compression to
2800                  * the saved value.
2801                  */
2802                 switch (ccomp->hdr.pagecode & ~0x80) {
2803                 case SA_DATA_COMPRESSION_PAGE:
2804                 if (ccomp->dcomp.dce_and_dcc & SA_DCP_DCC) {
2805                         struct scsi_data_compression_page *dcp = &cpage->dcomp;
2806                         if (calg == 0) {
2807                                 /*
2808                                  * Disable compression, but leave the
2809                                  * decompression and the capability bit
2810                                  * alone.
2811                                  */
2812                                 dcp->dce_and_dcc = SA_DCP_DCC;
2813                                 dcp->dde_and_red |= SA_DCP_DDE;
2814                                 break;
2815                         }
2816                         /* enable compression && decompression */
2817                         dcp->dce_and_dcc = SA_DCP_DCE | SA_DCP_DCC;
2818                         dcp->dde_and_red |= SA_DCP_DDE;
2819                         /*
2820                          * If there, use compression algorithm from caller.
2821                          * Otherwise, if there's a saved compression algorithm
2822                          * and there is no current algorithm, use the saved
2823                          * algorithm. Else parrot back what we got and hope
2824                          * for the best.
2825                          */
2826                         if (calg != MT_COMP_ENABLE) {
2827                                 scsi_ulto4b(calg, dcp->comp_algorithm);
2828                                 scsi_ulto4b(calg, dcp->decomp_algorithm);
2829                         } else if (scsi_4btoul(dcp->comp_algorithm) == 0 &&
2830                             softc->saved_comp_algorithm != 0) {
2831                                 scsi_ulto4b(softc->saved_comp_algorithm,
2832                                     dcp->comp_algorithm);
2833                                 scsi_ulto4b(softc->saved_comp_algorithm,
2834                                     dcp->decomp_algorithm);
2835                         }
2836                         break;
2837                 }
2838                 case SA_DEVICE_CONFIGURATION_PAGE:
2839                 {
2840                         struct scsi_dev_conf_page *dcp = &cpage->dconf;
2841                         if (calg == 0) {
2842                                 dcp->sel_comp_alg = SA_COMP_NONE;
2843                                 break;
2844                         }
2845                         if (calg != MT_COMP_ENABLE) {
2846                                 dcp->sel_comp_alg = calg;
2847                         } else if (dcp->sel_comp_alg == SA_COMP_NONE &&
2848                             softc->saved_comp_algorithm != 0) {
2849                                 dcp->sel_comp_alg = softc->saved_comp_algorithm;
2850                         }
2851                         break;
2852                 }
2853                 default:
2854                         /*
2855                          * The drive doesn't seem to support compression,
2856                          * so turn off the set compression bit.
2857                          */
2858                         params_to_set &= ~SA_PARAM_COMPRESSION;
2859                         xpt_print_path(periph->path);
2860                         printf("device does not seem to support compression\n");
2861
2862                         /*
2863                          * If that was the only thing the user wanted us to set,
2864                          * clean up allocated resources and return with
2865                          * 'operation not supported'.
2866                          */
2867                         if (params_to_set == SA_PARAM_NONE) {
2868                                 free(mode_buffer, M_TEMP);
2869                                 xpt_release_ccb(ccb);
2870                                 return (ENODEV);
2871                         }
2872                 
2873                         /*
2874                          * That wasn't the only thing the user wanted us to set.
2875                          * So, decrease the stated mode buffer length by the
2876                          * size of the compression mode page.
2877                          */
2878                         mode_buffer_len -= sizeof(sa_comp_t);
2879                 }
2880         }
2881
2882         /* It is safe to retry this operation */
2883         scsi_mode_select(&ccb->csio, 5, sadone, MSG_SIMPLE_Q_TAG,
2884             (params_to_set & SA_PARAM_COMPRESSION)? TRUE : FALSE,
2885             FALSE, mode_buffer, mode_buffer_len, SSD_FULL_SIZE, SCSIOP_TIMEOUT);
2886
2887         error = cam_periph_runccb(ccb, saerror, 0,
2888             sense_flags, &softc->device_stats);
2889         QFRLS(ccb);
2890
2891         if (CAM_DEBUGGED(periph->path, CAM_DEBUG_INFO)) {
2892                 int idx;
2893                 char *xyz = mode_buffer;
2894                 xpt_print_path(periph->path);
2895                 printf("Err%d, Mode Select Data=", error);
2896                 for (idx = 0; idx < mode_buffer_len; idx++)
2897                         printf(" 0x%02x", xyz[idx] & 0xff);
2898                 printf("\n");
2899         }
2900
2901
2902         if (error) {
2903                 /*
2904                  * If we can, try without setting density/blocksize.
2905                  */
2906                 if (mode_blk) {
2907                         if ((params_to_set &
2908                             (SA_PARAM_DENSITY|SA_PARAM_BLOCKSIZE)) == 0) {
2909                                 mode_blk = NULL;
2910                                 goto retry;
2911                         }
2912                 } else {
2913                         mode_blk = (struct scsi_mode_blk_desc *)&mode_hdr[1];
2914                         cpage = (sa_comp_t *)&mode_blk[1];
2915                 }
2916
2917                 /*
2918                  * If we were setting the blocksize, and that failed, we
2919                  * want to set it to its original value.  If we weren't
2920                  * setting the blocksize, we don't want to change it.
2921                  */
2922                 scsi_ulto3b(current_blocksize, mode_blk->blklen);
2923
2924                 /*
2925                  * Set density if requested, else preserve old density.
2926                  * SCSI_SAME_DENSITY only applies to SCSI-2 or better
2927                  * devices, else density we've latched up in our softc.
2928                  */
2929                 if (params_to_set & SA_PARAM_DENSITY) {
2930                         mode_blk->density = current_density;
2931                 } else if (softc->scsi_rev > SCSI_REV_CCS) {
2932                         mode_blk->density = SCSI_SAME_DENSITY;
2933                 } else {
2934                         mode_blk->density = softc->media_density;
2935                 }
2936
2937                 if (params_to_set & SA_PARAM_COMPRESSION)
2938                         bcopy(ccomp, cpage, sizeof (sa_comp_t));
2939
2940                 /*
2941                  * The retry count is the only CCB field that might have been
2942                  * changed that we care about, so reset it back to 1.
2943                  */
2944                 ccb->ccb_h.retry_count = 1;
2945                 cam_periph_runccb(ccb, saerror, 0, sense_flags,
2946                     &softc->device_stats);
2947                 QFRLS(ccb);
2948         }
2949
2950         xpt_release_ccb(ccb);
2951
2952         if (ccomp != NULL)
2953                 free(ccomp, M_TEMP);
2954
2955         if (params_to_set & SA_PARAM_COMPRESSION) {
2956                 if (error) {
2957                         softc->flags &= ~SA_FLAG_COMP_ENABLED;
2958                         /*
2959                          * Even if we get an error setting compression,
2960                          * do not say that we don't support it. We could
2961                          * have been wrong, or it may be media specific.
2962                          *      softc->flags &= ~SA_FLAG_COMP_SUPP;
2963                          */
2964                         softc->saved_comp_algorithm = softc->comp_algorithm;
2965                         softc->comp_algorithm = 0;
2966                 } else {
2967                         softc->flags |= SA_FLAG_COMP_ENABLED;
2968                         softc->comp_algorithm = calg;
2969                 }
2970         }
2971
2972         free(mode_buffer, M_TEMP);
2973         return (error);
2974 }
2975
2976 static void
2977 saprevent(struct cam_periph *periph, int action)
2978 {
2979         struct  sa_softc *softc;
2980         union   ccb *ccb;               
2981         int     error, sf;
2982                 
2983         softc = (struct sa_softc *)periph->softc;
2984
2985         if ((action == PR_ALLOW) && (softc->flags & SA_FLAG_TAPE_LOCKED) == 0)
2986                 return;
2987         if ((action == PR_PREVENT) && (softc->flags & SA_FLAG_TAPE_LOCKED) != 0)
2988                 return;
2989
2990         /*
2991          * We can be quiet about illegal requests.
2992          */
2993         if (CAM_DEBUGGED(periph->path, CAM_DEBUG_INFO)) {
2994                 sf = 0;
2995         } else
2996                 sf = SF_QUIET_IR;
2997
2998         ccb = cam_periph_getccb(periph, 1);
2999
3000         /* It is safe to retry this operation */
3001         scsi_prevent(&ccb->csio, 5, sadone, MSG_SIMPLE_Q_TAG, action,
3002             SSD_FULL_SIZE, SCSIOP_TIMEOUT);
3003
3004         error = cam_periph_runccb(ccb, saerror, 0, sf, &softc->device_stats);
3005         QFRLS(ccb);
3006         if (error == 0) {
3007                 if (action == PR_ALLOW)
3008                         softc->flags &= ~SA_FLAG_TAPE_LOCKED;
3009                 else
3010                         softc->flags |= SA_FLAG_TAPE_LOCKED;
3011         }
3012
3013         xpt_release_ccb(ccb);
3014 }
3015
3016 static int
3017 sarewind(struct cam_periph *periph)
3018 {
3019         union   ccb *ccb;
3020         struct  sa_softc *softc;
3021         int     error;
3022                 
3023         softc = (struct sa_softc *)periph->softc;
3024
3025         ccb = cam_periph_getccb(periph, 1);
3026
3027         /* It is safe to retry this operation */
3028         scsi_rewind(&ccb->csio, 2, sadone, MSG_SIMPLE_Q_TAG, FALSE,
3029             SSD_FULL_SIZE, REWIND_TIMEOUT);
3030
3031         softc->dsreg = MTIO_DSREG_REW;
3032         error = cam_periph_runccb(ccb, saerror, 0, 0, &softc->device_stats);
3033         softc->dsreg = MTIO_DSREG_REST;
3034
3035         if ((ccb->ccb_h.status & CAM_DEV_QFRZN) != 0)
3036                 cam_release_devq(ccb->ccb_h.path, 0, 0, 0, FALSE);
3037
3038         xpt_release_ccb(ccb);
3039         if (error == 0)
3040                 softc->fileno = softc->blkno = (daddr_t) 0;
3041         else
3042                 softc->fileno = softc->blkno = (daddr_t) -1;
3043         return (error);
3044 }
3045
3046 static int
3047 saspace(struct cam_periph *periph, int count, scsi_space_code code)
3048 {
3049         union   ccb *ccb;
3050         struct  sa_softc *softc;
3051         int     error;
3052                 
3053         softc = (struct sa_softc *)periph->softc;
3054
3055         ccb = cam_periph_getccb(periph, 1);
3056
3057         /* This cannot be retried */
3058
3059         scsi_space(&ccb->csio, 0, sadone, MSG_SIMPLE_Q_TAG, code, count,
3060             SSD_FULL_SIZE, SPACE_TIMEOUT);
3061
3062         /*
3063          * Clear residual because we will be using it.
3064          */
3065         softc->last_ctl_resid = 0;
3066
3067         softc->dsreg = (count < 0)? MTIO_DSREG_REV : MTIO_DSREG_FWD;
3068         error = cam_periph_runccb(ccb, saerror, 0, 0, &softc->device_stats);
3069         softc->dsreg = MTIO_DSREG_REST;
3070
3071         if ((ccb->ccb_h.status & CAM_DEV_QFRZN) != 0)
3072                 cam_release_devq(ccb->ccb_h.path, 0, 0, 0, FALSE);
3073
3074         xpt_release_ccb(ccb);
3075
3076         /*
3077          * If a spacing operation has failed, we need to invalidate
3078          * this mount.
3079          *
3080          * If the spacing operation was setmarks or to end of recorded data,
3081          * we no longer know our relative position.
3082          *
3083          * If the spacing operations was spacing files in reverse, we
3084          * take account of the residual, but still check against less
3085          * than zero- if we've gone negative, we must have hit BOT.
3086          *
3087          * If the spacing operations was spacing records in reverse and
3088          * we have a residual, we've either hit BOT or hit a filemark.
3089          * In the former case, we know our new record number (0). In
3090          * the latter case, we have absolutely no idea what the real
3091          * record number is- we've stopped between the end of the last
3092          * record in the previous file and the filemark that stopped
3093          * our spacing backwards.
3094          */
3095         if (error) {
3096                 softc->fileno = softc->blkno = (daddr_t) -1;
3097         } else if (code == SS_SETMARKS || code == SS_EOD) {
3098                 softc->fileno = softc->blkno = (daddr_t) -1;
3099         } else if (code == SS_FILEMARKS && softc->fileno != (daddr_t) -1) {
3100                 softc->fileno += (count - softc->last_ctl_resid);
3101                 if (softc->fileno < 0)  /* we must of hit BOT */
3102                         softc->fileno = 0;
3103                 softc->blkno = 0;
3104         } else if (code == SS_BLOCKS && softc->blkno != (daddr_t) -1) {
3105                 softc->blkno += (count - softc->last_ctl_resid);
3106                 if (count < 0) {
3107                         if (softc->last_ctl_resid || softc->blkno < 0) {
3108                                 if (softc->fileno == 0) {
3109                                         softc->blkno = 0;
3110                                 } else {
3111                                         softc->blkno = (daddr_t) -1;
3112                                 }
3113                         }
3114                 }
3115         }
3116         return (error);
3117 }
3118
3119 static int
3120 sawritefilemarks(struct cam_periph *periph, int nmarks, int setmarks)
3121 {
3122         union   ccb *ccb;
3123         struct  sa_softc *softc;
3124         int     error, nwm = 0;
3125
3126         softc = (struct sa_softc *)periph->softc;
3127
3128         ccb = cam_periph_getccb(periph, 1);
3129         /*
3130          * Clear residual because we will be using it.
3131          */
3132         softc->last_ctl_resid = 0;
3133
3134         softc->dsreg = MTIO_DSREG_FMK;
3135         /* this *must* not be retried */
3136         scsi_write_filemarks(&ccb->csio, 0, sadone, MSG_SIMPLE_Q_TAG,
3137             FALSE, setmarks, nmarks, SSD_FULL_SIZE, IO_TIMEOUT);
3138         softc->dsreg = MTIO_DSREG_REST;
3139
3140
3141         error = cam_periph_runccb(ccb, saerror, 0, 0, &softc->device_stats);
3142
3143         if ((ccb->ccb_h.status & CAM_DEV_QFRZN) != 0)
3144                 cam_release_devq(ccb->ccb_h.path, 0, 0, 0, FALSE);
3145
3146         if (error == 0 && nmarks) {
3147                 struct sa_softc *softc = (struct sa_softc *)periph->softc;
3148                 nwm = nmarks - softc->last_ctl_resid;
3149                 softc->filemarks += nwm;
3150         }
3151
3152         xpt_release_ccb(ccb);
3153
3154         /*
3155          * Update relative positions (if we're doing that).
3156          */
3157         if (error) {
3158                 softc->fileno = softc->blkno = (daddr_t) -1;
3159         } else if (softc->fileno != (daddr_t) -1) {
3160                 softc->fileno += nwm;
3161                 softc->blkno = 0;
3162         }
3163         return (error);
3164 }
3165
3166 static int
3167 sardpos(struct cam_periph *periph, int hard, u_int32_t *blkptr)
3168 {
3169         struct scsi_tape_position_data loc;
3170         union ccb *ccb;
3171         struct sa_softc *softc = (struct sa_softc *)periph->softc;
3172         int error;
3173
3174         /*
3175          * We try and flush any buffered writes here if we were writing
3176          * and we're trying to get hardware block position. It eats
3177          * up performance substantially, but I'm wary of drive firmware.
3178          *
3179          * I think that *logical* block position is probably okay-
3180          * but hardware block position might have to wait for data
3181          * to hit media to be valid. Caveat Emptor.
3182          */
3183
3184         if (hard && (softc->flags & SA_FLAG_TAPE_WRITTEN)) {
3185                 error = sawritefilemarks(periph, 0, 0);
3186                 if (error && error != EACCES)
3187                         return (error);
3188         }
3189
3190         ccb = cam_periph_getccb(periph, 1);
3191         scsi_read_position(&ccb->csio, 1, sadone, MSG_SIMPLE_Q_TAG,
3192             hard, &loc, SSD_FULL_SIZE, SCSIOP_TIMEOUT);
3193         softc->dsreg = MTIO_DSREG_RBSY;
3194         error = cam_periph_runccb(ccb, saerror, 0, 0, &softc->device_stats);
3195         softc->dsreg = MTIO_DSREG_REST;
3196         if ((ccb->ccb_h.status & CAM_DEV_QFRZN) != 0)
3197                 cam_release_devq(ccb->ccb_h.path, 0, 0, 0, 0);
3198
3199         if (error == 0) {
3200                 if (loc.flags & SA_RPOS_UNCERTAIN) {
3201                         error = EINVAL;         /* nothing is certain */
3202                 } else {
3203                         *blkptr = scsi_4btoul(loc.firstblk);
3204                 }
3205         }
3206
3207         xpt_release_ccb(ccb);
3208         return (error);
3209 }
3210
3211 static int
3212 sasetpos(struct cam_periph *periph, int hard, u_int32_t *blkptr)
3213 {
3214         union ccb *ccb;
3215         struct sa_softc *softc;
3216         int error;
3217
3218         /*
3219          * We used to try and flush any buffered writes here.
3220          * Now we push this onto user applications to either
3221          * flush the pending writes themselves (via a zero count
3222          * WRITE FILEMARKS command) or they can trust their tape
3223          * drive to do this correctly for them.
3224          */
3225
3226         softc = (struct sa_softc *)periph->softc;
3227         ccb = cam_periph_getccb(periph, 1);
3228
3229         
3230         scsi_set_position(&ccb->csio, 1, sadone, MSG_SIMPLE_Q_TAG,
3231             hard, *blkptr, SSD_FULL_SIZE, SPACE_TIMEOUT);
3232
3233
3234         softc->dsreg = MTIO_DSREG_POS;
3235         error = cam_periph_runccb(ccb, saerror, 0, 0, &softc->device_stats);
3236         softc->dsreg = MTIO_DSREG_REST;
3237         if ((ccb->ccb_h.status & CAM_DEV_QFRZN) != 0)
3238                 cam_release_devq(ccb->ccb_h.path, 0, 0, 0, 0);
3239         xpt_release_ccb(ccb);
3240         /*
3241          * Note relative file && block number position as now unknown.
3242          */
3243         softc->fileno = softc->blkno = (daddr_t) -1;
3244         return (error);
3245 }
3246
3247 static int
3248 saretension(struct cam_periph *periph)
3249 {
3250         union ccb *ccb;
3251         struct sa_softc *softc;
3252         int error;
3253
3254         softc = (struct sa_softc *)periph->softc;
3255
3256         ccb = cam_periph_getccb(periph, 1);
3257
3258         /* It is safe to retry this operation */
3259         scsi_load_unload(&ccb->csio, 5, sadone, MSG_SIMPLE_Q_TAG, FALSE,
3260             FALSE, TRUE,  TRUE, SSD_FULL_SIZE, ERASE_TIMEOUT);
3261
3262         softc->dsreg = MTIO_DSREG_TEN;
3263         error = cam_periph_runccb(ccb, saerror, 0, 0, &softc->device_stats);
3264         softc->dsreg = MTIO_DSREG_REST;
3265
3266         if ((ccb->ccb_h.status & CAM_DEV_QFRZN) != 0)
3267                 cam_release_devq(ccb->ccb_h.path, 0, 0, 0, FALSE);
3268         xpt_release_ccb(ccb);
3269         if (error == 0)
3270                 softc->fileno = softc->blkno = (daddr_t) 0;
3271         else
3272                 softc->fileno = softc->blkno = (daddr_t) -1;
3273         return (error);
3274 }
3275
3276 static int
3277 sareservereleaseunit(struct cam_periph *periph, int reserve)
3278 {
3279         union ccb *ccb;
3280         struct sa_softc *softc;
3281         int error;
3282
3283         softc = (struct sa_softc *)periph->softc;
3284         ccb = cam_periph_getccb(periph,  1);
3285
3286         /* It is safe to retry this operation */
3287         scsi_reserve_release_unit(&ccb->csio, 2, sadone, MSG_SIMPLE_Q_TAG,
3288             FALSE,  0, SSD_FULL_SIZE,  SCSIOP_TIMEOUT, reserve);
3289         softc->dsreg = MTIO_DSREG_RBSY;
3290         error = cam_periph_runccb(ccb, saerror, 0,
3291             SF_RETRY_UA | SF_NO_PRINT, &softc->device_stats);
3292         softc->dsreg = MTIO_DSREG_REST;
3293         QFRLS(ccb);
3294         xpt_release_ccb(ccb);
3295
3296         /*
3297          * If the error was Illegal Request, then the device doesn't support
3298          * RESERVE/RELEASE. This is not an error.
3299          */
3300         if (error == EINVAL) {
3301                 error = 0;
3302         }
3303
3304         return (error);
3305 }
3306
3307 static int
3308 saloadunload(struct cam_periph *periph, int load)
3309 {
3310         union   ccb *ccb;
3311         struct  sa_softc *softc;
3312         int     error;
3313
3314         softc = (struct sa_softc *)periph->softc;
3315
3316         ccb = cam_periph_getccb(periph, 1);
3317
3318         /* It is safe to retry this operation */
3319         scsi_load_unload(&ccb->csio, 5, sadone, MSG_SIMPLE_Q_TAG, FALSE,
3320             FALSE, FALSE, load, SSD_FULL_SIZE, REWIND_TIMEOUT);
3321
3322         softc->dsreg = (load)? MTIO_DSREG_LD : MTIO_DSREG_UNL;
3323         error = cam_periph_runccb(ccb, saerror, 0, 0, &softc->device_stats);
3324         softc->dsreg = MTIO_DSREG_REST;
3325         QFRLS(ccb);
3326         xpt_release_ccb(ccb);
3327
3328         if (error || load == 0)
3329                 softc->fileno = softc->blkno = (daddr_t) -1;
3330         else if (error == 0)
3331                 softc->fileno = softc->blkno = (daddr_t) 0;
3332         return (error);
3333 }
3334
3335 static int
3336 saerase(struct cam_periph *periph, int longerase)
3337 {
3338
3339         union   ccb *ccb;
3340         struct  sa_softc *softc;
3341         int error;
3342
3343         softc = (struct sa_softc *)periph->softc;
3344
3345         ccb = cam_periph_getccb(periph, 1);
3346
3347         scsi_erase(&ccb->csio, 1, sadone, MSG_SIMPLE_Q_TAG, FALSE, longerase,
3348             SSD_FULL_SIZE, ERASE_TIMEOUT);
3349
3350         softc->dsreg = MTIO_DSREG_ZER;
3351         error = cam_periph_runccb(ccb, saerror, 0, 0, &softc->device_stats);
3352         softc->dsreg = MTIO_DSREG_REST;
3353
3354         if ((ccb->ccb_h.status & CAM_DEV_QFRZN) != 0)
3355                 cam_release_devq(ccb->ccb_h.path, 0, 0, 0, FALSE);
3356         xpt_release_ccb(ccb);
3357         return (error);
3358 }
3359
3360 #endif /* _KERNEL */
3361
3362 /*
3363  * Read tape block limits command.
3364  */
3365 void
3366 scsi_read_block_limits(struct ccb_scsiio *csio, u_int32_t retries,
3367                    void (*cbfcnp)(struct cam_periph *, union ccb *),
3368                    u_int8_t tag_action,
3369                    struct scsi_read_block_limits_data *rlimit_buf,
3370                    u_int8_t sense_len, u_int32_t timeout)
3371 {
3372         struct scsi_read_block_limits *scsi_cmd;
3373
3374         cam_fill_csio(csio, retries, cbfcnp, CAM_DIR_IN, tag_action,
3375              (u_int8_t *)rlimit_buf, sizeof(*rlimit_buf), sense_len,
3376              sizeof(*scsi_cmd), timeout);
3377
3378         scsi_cmd = (struct scsi_read_block_limits *)&csio->cdb_io.cdb_bytes;
3379         bzero(scsi_cmd, sizeof(*scsi_cmd));
3380         scsi_cmd->opcode = READ_BLOCK_LIMITS;
3381 }
3382
3383 void
3384 scsi_sa_read_write(struct ccb_scsiio *csio, u_int32_t retries,
3385                    void (*cbfcnp)(struct cam_periph *, union ccb *),
3386                    u_int8_t tag_action, int readop, int sli,
3387                    int fixed, u_int32_t length, u_int8_t *data_ptr,
3388                    u_int32_t dxfer_len, u_int8_t sense_len, u_int32_t timeout)
3389 {
3390         struct scsi_sa_rw *scsi_cmd;
3391
3392         scsi_cmd = (struct scsi_sa_rw *)&csio->cdb_io.cdb_bytes;
3393         scsi_cmd->opcode = readop ? SA_READ : SA_WRITE;
3394         scsi_cmd->sli_fixed = 0;
3395         if (sli && readop)
3396                 scsi_cmd->sli_fixed |= SAR_SLI;
3397         if (fixed)
3398                 scsi_cmd->sli_fixed |= SARW_FIXED;
3399         scsi_ulto3b(length, scsi_cmd->length);
3400         scsi_cmd->control = 0;
3401
3402         cam_fill_csio(csio, retries, cbfcnp, readop ? CAM_DIR_IN : CAM_DIR_OUT,
3403             tag_action, data_ptr, dxfer_len, sense_len,
3404             sizeof(*scsi_cmd), timeout);
3405 }
3406
3407 void
3408 scsi_load_unload(struct ccb_scsiio *csio, u_int32_t retries,         
3409                  void (*cbfcnp)(struct cam_periph *, union ccb *),   
3410                  u_int8_t tag_action, int immediate, int eot,
3411                  int reten, int load, u_int8_t sense_len,
3412                  u_int32_t timeout)
3413 {
3414         struct scsi_load_unload *scsi_cmd;
3415
3416         scsi_cmd = (struct scsi_load_unload *)&csio->cdb_io.cdb_bytes;
3417         bzero(scsi_cmd, sizeof(*scsi_cmd));
3418         scsi_cmd->opcode = LOAD_UNLOAD;
3419         if (immediate)
3420                 scsi_cmd->immediate = SLU_IMMED;
3421         if (eot)
3422                 scsi_cmd->eot_reten_load |= SLU_EOT;
3423         if (reten)
3424                 scsi_cmd->eot_reten_load |= SLU_RETEN;
3425         if (load)
3426                 scsi_cmd->eot_reten_load |= SLU_LOAD;
3427
3428         cam_fill_csio(csio, retries, cbfcnp, CAM_DIR_NONE, tag_action,
3429             NULL, 0, sense_len, sizeof(*scsi_cmd), timeout);    
3430 }
3431
3432 void
3433 scsi_rewind(struct ccb_scsiio *csio, u_int32_t retries,         
3434             void (*cbfcnp)(struct cam_periph *, union ccb *),   
3435             u_int8_t tag_action, int immediate, u_int8_t sense_len,     
3436             u_int32_t timeout)
3437 {
3438         struct scsi_rewind *scsi_cmd;
3439
3440         scsi_cmd = (struct scsi_rewind *)&csio->cdb_io.cdb_bytes;
3441         bzero(scsi_cmd, sizeof(*scsi_cmd));
3442         scsi_cmd->opcode = REWIND;
3443         if (immediate)
3444                 scsi_cmd->immediate = SREW_IMMED;
3445         
3446         cam_fill_csio(csio, retries, cbfcnp, CAM_DIR_NONE, tag_action, NULL,
3447             0, sense_len, sizeof(*scsi_cmd), timeout);
3448 }
3449
3450 void
3451 scsi_space(struct ccb_scsiio *csio, u_int32_t retries,
3452            void (*cbfcnp)(struct cam_periph *, union ccb *),
3453            u_int8_t tag_action, scsi_space_code code,
3454            u_int32_t count, u_int8_t sense_len, u_int32_t timeout)
3455 {
3456         struct scsi_space *scsi_cmd;
3457
3458         scsi_cmd = (struct scsi_space *)&csio->cdb_io.cdb_bytes;
3459         scsi_cmd->opcode = SPACE;
3460         scsi_cmd->code = code;
3461         scsi_ulto3b(count, scsi_cmd->count);
3462         scsi_cmd->control = 0;
3463
3464         cam_fill_csio(csio, retries, cbfcnp, CAM_DIR_NONE, tag_action, NULL,
3465             0, sense_len, sizeof(*scsi_cmd), timeout);
3466 }
3467
3468 void
3469 scsi_write_filemarks(struct ccb_scsiio *csio, u_int32_t retries,
3470                      void (*cbfcnp)(struct cam_periph *, union ccb *),
3471                      u_int8_t tag_action, int immediate, int setmark,
3472                      u_int32_t num_marks, u_int8_t sense_len,
3473                      u_int32_t timeout)
3474 {
3475         struct scsi_write_filemarks *scsi_cmd;
3476
3477         scsi_cmd = (struct scsi_write_filemarks *)&csio->cdb_io.cdb_bytes;
3478         bzero(scsi_cmd, sizeof(*scsi_cmd));
3479         scsi_cmd->opcode = WRITE_FILEMARKS;
3480         if (immediate)
3481                 scsi_cmd->byte2 |= SWFMRK_IMMED;
3482         if (setmark)
3483                 scsi_cmd->byte2 |= SWFMRK_WSMK;
3484         
3485         scsi_ulto3b(num_marks, scsi_cmd->num_marks);
3486
3487         cam_fill_csio(csio, retries, cbfcnp, CAM_DIR_NONE, tag_action, NULL,
3488             0, sense_len, sizeof(*scsi_cmd), timeout);
3489 }
3490
3491 /*
3492  * The reserve and release unit commands differ only by their opcodes.
3493  */
3494 void
3495 scsi_reserve_release_unit(struct ccb_scsiio *csio, u_int32_t retries,
3496                           void (*cbfcnp)(struct cam_periph *, union ccb *),
3497                           u_int8_t tag_action, int third_party,
3498                           int third_party_id, u_int8_t sense_len,
3499                           u_int32_t timeout, int reserve)
3500 {
3501         struct scsi_reserve_release_unit *scsi_cmd;
3502
3503         scsi_cmd = (struct scsi_reserve_release_unit *)&csio->cdb_io.cdb_bytes;
3504         bzero(scsi_cmd, sizeof(*scsi_cmd));
3505
3506         if (reserve)
3507                 scsi_cmd->opcode = RESERVE_UNIT;
3508         else
3509                 scsi_cmd->opcode = RELEASE_UNIT;
3510
3511         if (third_party) {
3512                 scsi_cmd->lun_thirdparty |= SRRU_3RD_PARTY;
3513                 scsi_cmd->lun_thirdparty |=
3514                         ((third_party_id << SRRU_3RD_SHAMT) & SRRU_3RD_MASK);
3515         }
3516
3517         cam_fill_csio(csio, retries, cbfcnp, CAM_DIR_NONE, tag_action, NULL,
3518             0, sense_len, sizeof(*scsi_cmd), timeout);
3519 }
3520
3521 void
3522 scsi_erase(struct ccb_scsiio *csio, u_int32_t retries,
3523            void (*cbfcnp)(struct cam_periph *, union ccb *),
3524            u_int8_t tag_action, int immediate, int long_erase,
3525            u_int8_t sense_len, u_int32_t timeout)
3526 {
3527         struct scsi_erase *scsi_cmd;
3528
3529         scsi_cmd = (struct scsi_erase *)&csio->cdb_io.cdb_bytes;
3530         bzero(scsi_cmd, sizeof(*scsi_cmd));
3531
3532         scsi_cmd->opcode = ERASE;
3533
3534         if (immediate)
3535                 scsi_cmd->lun_imm_long |= SE_IMMED;
3536
3537         if (long_erase)
3538                 scsi_cmd->lun_imm_long |= SE_LONG;
3539
3540         cam_fill_csio(csio, retries, cbfcnp, CAM_DIR_NONE, tag_action, NULL,
3541             0, sense_len, sizeof(*scsi_cmd), timeout);
3542 }
3543
3544 /*
3545  * Read Tape Position command.
3546  */
3547 void
3548 scsi_read_position(struct ccb_scsiio *csio, u_int32_t retries,
3549                    void (*cbfcnp)(struct cam_periph *, union ccb *),
3550                    u_int8_t tag_action, int hardsoft,
3551                    struct scsi_tape_position_data *sbp,
3552                    u_int8_t sense_len, u_int32_t timeout)
3553 {
3554         struct scsi_tape_read_position *scmd;
3555
3556         cam_fill_csio(csio, retries, cbfcnp, CAM_DIR_IN, tag_action,
3557             (u_int8_t *)sbp, sizeof (*sbp), sense_len, sizeof(*scmd), timeout);
3558         scmd = (struct scsi_tape_read_position *)&csio->cdb_io.cdb_bytes;
3559         bzero(scmd, sizeof(*scmd));
3560         scmd->opcode = READ_POSITION;
3561         scmd->byte1 = hardsoft;
3562 }
3563
3564 /*
3565  * Set Tape Position command.
3566  */
3567 void
3568 scsi_set_position(struct ccb_scsiio *csio, u_int32_t retries,
3569                    void (*cbfcnp)(struct cam_periph *, union ccb *),
3570                    u_int8_t tag_action, int hardsoft, u_int32_t blkno,
3571                    u_int8_t sense_len, u_int32_t timeout)
3572 {
3573         struct scsi_tape_locate *scmd;
3574
3575         cam_fill_csio(csio, retries, cbfcnp, CAM_DIR_NONE, tag_action,
3576             (u_int8_t *)NULL, 0, sense_len, sizeof(*scmd), timeout);
3577         scmd = (struct scsi_tape_locate *)&csio->cdb_io.cdb_bytes;
3578         bzero(scmd, sizeof(*scmd));
3579         scmd->opcode = LOCATE;
3580         if (hardsoft)
3581                 scmd->byte1 |= SA_SPOS_BT;
3582         scsi_ulto4b(blkno, scmd->blkaddr);
3583 }