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 1.26 2007/11/25 18:14:26 pavalos 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_bio         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          bio_queue_head bio_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, cdev_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 PERIPHDRIVER_DECLARE(sa, 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 dev_ops sa_ops = {
 429         { "sa", SA_CDEV_MAJOR, D_TAPE },
 430         .d_open =       saopen,
 431         .d_close =      saclose,
 432         .d_read =       physread,
 433         .d_write =      physwrite,
 434         .d_ioctl =      saioctl,
 435         .d_strategy =   sastrategy,
 436 };
 437
 438 static struct extend_array *saperiphs;
 439
 440 static int
 441 saopen(struct dev_open_args *ap)
 442 {
 443         cdev_t dev = ap->a_head.a_dev;
 444         struct cam_periph *periph;
 445         struct sa_softc *softc;
 446         int unit;
 447         int error;
 448
 449         unit = SAUNIT(dev);
 450
 451         crit_enter();
 452         periph = cam_extend_get(saperiphs, unit);
 453         if (periph == NULL) {
 454                 crit_exit();
 455                 return (ENXIO);
 456         }
 457         softc = (struct sa_softc *)periph->softc;
 458         if ((error = cam_periph_lock(periph, PCATCH)) != 0) {
 459                 crit_exit();
 460                 return (error);
 461         }
 462         crit_exit();
 463
 464         CAM_DEBUG(periph->path, CAM_DEBUG_TRACE|CAM_DEBUG_INFO,
 465             ("saopen(%d): dev=0x%x softc=0x%x\n", unit, unit, softc->flags));
 466
 467         if (cam_periph_acquire(periph) != CAM_REQ_CMP) {
 468                 cam_periph_unlock(periph);
 469                 return (ENXIO);
 470         }
 471         if (SA_IS_CTRL(dev)) {
 472                 softc->ctrl_mode = 1;
 473                 cam_periph_unlock(periph);
 474                 return (0);
 475         }
 476
 477
 478         if (softc->flags & SA_FLAG_OPEN) {
 479                 error = EBUSY;
 480         } else if (softc->flags & SA_FLAG_INVALID) {
 481                 error = ENXIO;
 482         } else {
 483                 /*
 484                  * The function samount ensures media is loaded and ready.
 485                  * It also does a device RESERVE if the tape isn't yet mounted.
 486                  */
 487                 error = samount(periph, ap->a_oflags, dev);
 488         }
 489
 490         if (error) {
 491                 cam_periph_release(periph);
 492         } else {
 493                 saprevent(periph, PR_PREVENT);
 494                 softc->flags |= SA_FLAG_OPEN;
 495         }
 496         cam_periph_unlock(periph);
 497         return (error);
 498 }
 499
 500 static int
 501 saclose(struct dev_close_args *ap)
 502 {
 503         cdev_t dev = ap->a_head.a_dev;
 504         struct  cam_periph *periph;
 505         struct  sa_softc *softc;
 506         int     unit, mode, error, writing, tmp;
 507         int     closedbits = SA_FLAG_OPEN;
 508
 509         unit = SAUNIT(dev);
 510         mode = SAMODE(dev);
 511         periph = cam_extend_get(saperiphs, unit);
 512         if (periph == NULL)
 513                 return (ENXIO);
 514
 515         softc = (struct sa_softc *)periph->softc;
 516
 517         CAM_DEBUG(periph->path, CAM_DEBUG_TRACE|CAM_DEBUG_INFO,
 518             ("saclose(%d): dev=0x%x softc=0x%x\n", unit, unit, softc->flags));
 519
 520
 521         if ((error = cam_periph_lock(periph, 0)) != 0) {
 522                 return (error);
 523         }
 524
 525         if (SA_IS_CTRL(dev)) {
 526                 softc->ctrl_mode = 0;
 527                 cam_periph_release(periph);
 528                 cam_periph_unlock(periph);
 529                 return (0);
 530         }
 531
 532         /*
 533          * Were we writing the tape?
 534          */
 535         writing = (softc->flags & SA_FLAG_TAPE_WRITTEN) != 0;
 536
 537         /*
 538          * See whether or not we need to write filemarks. If this
 539          * fails, we probably have to assume we've lost tape
 540          * position.
 541          */
 542         error = sacheckeod(periph);
 543         if (error) {
 544                 xpt_print_path(periph->path);
 545                 kprintf("failed to write terminating filemark(s)\n");
 546                 softc->flags |= SA_FLAG_TAPE_FROZEN;
 547         }
 548
 549         /*
 550          * Whatever we end up doing, allow users to eject tapes from here on.
 551          */
 552         saprevent(periph, PR_ALLOW);
 553
 554         /*
 555          * Decide how to end...
 556          */
 557         if ((softc->flags & SA_FLAG_TAPE_MOUNTED) == 0) {
 558                 closedbits |= SA_FLAG_TAPE_FROZEN;
 559         } else switch (mode) {
 560         case SA_MODE_OFFLINE:
 561                 /*
 562                  * An 'offline' close is an unconditional release of
 563                  * frozen && mount conditions, irrespective of whether
 564                  * these operations succeeded. The reason for this is
 565                  * to allow at least some kind of programmatic way
 566                  * around our state getting all fouled up. If somebody
 567                  * issues an 'offline' command, that will be allowed
 568                  * to clear state.
 569                  */
 570                 sarewind(periph);
 571                 saloadunload(periph, FALSE);
 572                 closedbits |= SA_FLAG_TAPE_MOUNTED|SA_FLAG_TAPE_FROZEN;
 573                 break;
 574         case SA_MODE_REWIND:
 575                 /*
 576                  * If the rewind fails, return an error- if anyone cares,
 577                  * but not overwriting any previous error.
 578                  *
 579                  * We don't clear the notion of mounted here, but we do
 580                  * clear the notion of frozen if we successfully rewound.
 581                  */
 582                 tmp = sarewind(periph);
 583                 if (tmp) {
 584                         if (error != 0)
 585                                 error = tmp;
 586                 } else {
 587                         closedbits |= SA_FLAG_TAPE_FROZEN;
 588                 }
 589                 break;
 590         case SA_MODE_NOREWIND:
 591                 /*
 592                  * If we're not rewinding/unloading the tape, find out
 593                  * whether we need to back up over one of two filemarks
 594                  * we wrote (if we wrote two filemarks) so that appends
 595                  * from this point on will be sane.
 596                  */
 597                 if (error == 0 && writing && (softc->quirks & SA_QUIRK_2FM)) {
 598                         tmp = saspace(periph, -1, SS_FILEMARKS);
 599                         if (tmp) {
 600                                 xpt_print_path(periph->path);
 601                                 kprintf("unable to backspace over one of double"
 602                                    " filemarks at end of tape\n");
 603                                 xpt_print_path(periph->path);
 604                                 kprintf("it is possible that this device"
 605                                    " needs a SA_QUIRK_1FM quirk set for it\n");
 606                                 softc->flags |= SA_FLAG_TAPE_FROZEN;
 607                         }
 608                 }
 609                 break;
 610         default:
 611                 xpt_print_path(periph->path);
 612                 panic("unknown mode 0x%x in saclose", mode);
 613                 /* NOTREACHED */
 614                 break;
 615         }
 616
 617         /*
 618          * We wish to note here that there are no more filemarks to be written.
 619          */
 620         softc->filemarks = 0;
 621         softc->flags &= ~SA_FLAG_TAPE_WRITTEN;
 622
 623         /*
 624          * And we are no longer open for business.
 625          */
 626         softc->flags &= ~closedbits;
 627
 628         /*
 629          * Inform users if tape state if frozen....
 630          */
 631         if (softc->flags & SA_FLAG_TAPE_FROZEN) {
 632                 xpt_print_path(periph->path);
 633                 kprintf("tape is now frozen- use an OFFLINE, REWIND or MTEOM "
 634                     "command to clear this state.\n");
 635         }
 636
 637         /* release the device if it is no longer mounted */
 638         if ((softc->flags & SA_FLAG_TAPE_MOUNTED) == 0)
 639                 sareservereleaseunit(periph, FALSE);
 640
 641         cam_periph_unlock(periph);
 642         cam_periph_release(periph);
 643
 644         return (error);
 645 }
 646
 647 /*
 648  * Actually translate the requested transfer into one the physical driver
 649  * can understand.  The transfer is described by a buf and will include
 650  * only one physical transfer.
 651  */
 652 static int
 653 sastrategy(struct dev_strategy_args *ap)
 654 {
 655         cdev_t dev = ap->a_head.a_dev;
 656         struct bio *bio = ap->a_bio;
 657         struct buf *bp = bio->bio_buf;
 658         struct cam_periph *periph;
 659         struct sa_softc *softc;
 660         u_int  unit;
 661
 662         if (SA_IS_CTRL(dev)) {
 663                 bp->b_error = EINVAL;
 664                 goto bad;
 665         }
 666         unit = SAUNIT(dev);
 667         periph = cam_extend_get(saperiphs, unit);
 668         if (periph == NULL) {
 669                 bp->b_error = ENXIO;
 670                 goto bad;
 671         }
 672         softc = (struct sa_softc *)periph->softc;
 673
 674         crit_enter();
 675
 676         if (softc->flags & SA_FLAG_INVALID) {
 677                 crit_exit();
 678                 bp->b_error = ENXIO;
 679                 goto bad;
 680         }
 681
 682         if (softc->flags & SA_FLAG_TAPE_FROZEN) {
 683                 crit_exit();
 684                 bp->b_error = EPERM;
 685                 goto bad;
 686         }
 687
 688         crit_exit();
 689
 690         /*
 691          * If it's a null transfer, return immediatly
 692          */
 693         if (bp->b_bcount == 0)
 694                 goto done;
 695
 696         /* valid request?  */
 697         if (softc->flags & SA_FLAG_FIXED) {
 698                 /*
 699                  * Fixed block device.  The byte count must
 700                  * be a multiple of our block size.
 701                  */
 702                 if (((softc->blk_mask != ~0) &&
 703                     ((bp->b_bcount & softc->blk_mask) != 0)) ||
 704                     ((softc->blk_mask == ~0) &&
 705                     ((bp->b_bcount % softc->min_blk) != 0))) {
 706                         xpt_print_path(periph->path);
 707                         kprintf("Invalid request.  Fixed block device "
 708                                "requests must be a multiple "
 709                                "of %d bytes\n", softc->media_blksize);
 710                         bp->b_error = EINVAL;
 711                         goto bad;
 712                 }
 713         } else if ((bp->b_bcount > softc->max_blk) ||
 714                    (bp->b_bcount < softc->min_blk) ||
 715                    (bp->b_bcount & softc->blk_mask) != 0) {
 716
 717                 xpt_print_path(periph->path);
 718                 kprintf("Invalid request.  Variable block device "
 719                     "requests must be ");
 720                 if (softc->blk_mask != 0) {
 721                         kprintf("a multiple of %d ", (0x1 << softc->blk_gran));
 722                 }
 723                 kprintf("between %d and %d bytes\n", softc->min_blk,
 724                     softc->max_blk);
 725                 bp->b_error = EINVAL;
 726                 goto bad;
 727         }
 728
 729         /*
 730          * Mask interrupts so that the device cannot be invalidated until
 731          * after we are in the queue.  Otherwise, we might not properly
 732          * clean up one of the buffers.
 733          */
 734         crit_enter();
 735
 736         /*
 737          * Place it at the end of the queue.
 738          */
 739         bioq_insert_tail(&softc->bio_queue, bio);
 740
 741         softc->queue_count++;
 742         CAM_DEBUG(periph->path, CAM_DEBUG_INFO, ("sastrategy: enqueuing a %d "
 743             "%s byte %s queue count now %d\n", (int) bp->b_bcount,
 744              (softc->flags & SA_FLAG_FIXED)?  "fixed" : "variable",
 745              (bp->b_cmd == BUF_CMD_READ)? "read" : "write", softc->queue_count));
 746
 747         crit_exit();
 748
 749         /*
 750          * Schedule ourselves for performing the work.
 751          */
 752         xpt_schedule(periph, 1);
 753
 754         return(0);
 755 bad:
 756         bp->b_flags |= B_ERROR;
 757 done:
 758
 759         /*
 760          * Correctly set the buf to indicate a completed xfer
 761          */
 762         bp->b_resid = bp->b_bcount;
 763         biodone(bio);
 764         return(0);
 765 }
 766
 767 static int
 768 saioctl(struct dev_ioctl_args *ap)
 769 {
 770         cdev_t dev = ap->a_head.a_dev;
 771         caddr_t addr = ap->a_data;
 772         struct cam_periph *periph;
 773         struct sa_softc *softc;
 774         scsi_space_code spaceop;
 775         int didlockperiph = 0;
 776         int unit;
 777         int mode;
 778         int error = 0;
 779
 780         unit = SAUNIT(dev);
 781         mode = SAMODE(dev);
 782         error = 0;              /* shut up gcc */
 783         spaceop = 0;            /* shut up gcc */
 784
 785         periph = cam_extend_get(saperiphs, unit);
 786         if (periph == NULL)
 787                 return (ENXIO);
 788
 789         softc = (struct sa_softc *)periph->softc;
 790
 791         /*
 792          * Check for control mode accesses. We allow MTIOCGET and
 793          * MTIOCERRSTAT (but need to be the only one open in order
 794          * to clear latched status), and MTSETBSIZE, MTSETDNSTY
 795          * and MTCOMP (but need to be the only one accessing this
 796          * device to run those).
 797          */
 798
 799         if (SA_IS_CTRL(dev)) {
 800                 switch (ap->a_cmd) {
 801                 case MTIOCGETEOTMODEL:
 802                 case MTIOCGET:
 803                         break;
 804                 case MTIOCERRSTAT:
 805                         /*
 806                          * If the periph isn't already locked, lock it
 807                          * so our MTIOCERRSTAT can reset latched error stats.
 808                          *
 809                          * If the periph is already locked, skip it because
 810                          * we're just getting status and it'll be up to the
 811                          * other thread that has this device open to do
 812                          * an MTIOCERRSTAT that would clear latched status.
 813                          */
 814                         crit_enter();
 815                         if ((periph->flags & CAM_PERIPH_LOCKED) == 0) {
 816                                 error = cam_periph_lock(periph, PCATCH);
 817                                 if (error != 0) {
 818                                         crit_exit();
 819                                         return (error);
 820                                 }
 821                                 didlockperiph = 1;
 822                         }
 823                         crit_exit();
 824                         break;
 825
 826                 case MTIOCSETEOTMODEL:
 827                 case MTSETBSIZ:
 828                 case MTSETDNSTY:
 829                 case MTCOMP:
 830                         /*
 831                          * We need to acquire the peripheral here rather
 832                          * than at open time because we are sharing writable
 833                          * access to data structures.
 834                          */
 835                         crit_enter();
 836                         error = cam_periph_lock(periph, PCATCH);
 837                         if (error != 0) {
 838                                 crit_exit();
 839                                 return (error);
 840                         }
 841                         didlockperiph = 1;
 842                         crit_exit();
 843                         break;
 844
 845                 default:
 846                         return (EINVAL);
 847                 }
 848         }
 849
 850         /*
 851          * Find the device that the user is talking about
 852          */
 853         switch (ap->a_cmd) {
 854         case MTIOCGET:
 855         {
 856                 struct mtget *g = (struct mtget *)addr;
 857
 858                 /*
 859                  * If this isn't the control mode device, actually go out
 860                  * and ask the drive again what it's set to.
 861                  */
 862                 if (!SA_IS_CTRL(dev)) {
 863                         u_int8_t write_protect;
 864                         int comp_enabled, comp_supported;
 865                         error = sagetparams(periph, SA_PARAM_ALL,
 866                             &softc->media_blksize, &softc->media_density,
 867                             &softc->media_numblks, &softc->buffer_mode,
 868                             &write_protect, &softc->speed, &comp_supported,
 869                             &comp_enabled, &softc->comp_algorithm, NULL);
 870                         if (error)
 871                                 break;
 872                         if (write_protect)
 873                                 softc->flags |= SA_FLAG_TAPE_WP;
 874                         else
 875                                 softc->flags &= ~SA_FLAG_TAPE_WP;
 876                         softc->flags &= ~(SA_FLAG_COMP_SUPP|
 877                             SA_FLAG_COMP_ENABLED|SA_FLAG_COMP_UNSUPP);
 878                         if (comp_supported) {
 879                                 if (softc->saved_comp_algorithm == 0)
 880                                         softc->saved_comp_algorithm =
 881                                             softc->comp_algorithm;
 882                                 softc->flags |= SA_FLAG_COMP_SUPP;
 883                                 if (comp_enabled)
 884                                         softc->flags |= SA_FLAG_COMP_ENABLED;
 885                         } else
 886                                 softc->flags |= SA_FLAG_COMP_UNSUPP;
 887                 }
 888                 bzero(g, sizeof(struct mtget));
 889                 g->mt_type = MT_ISAR;
 890                 if (softc->flags & SA_FLAG_COMP_UNSUPP) {
 891                         g->mt_comp = MT_COMP_UNSUPP;
 892                         g->mt_comp0 = MT_COMP_UNSUPP;
 893                         g->mt_comp1 = MT_COMP_UNSUPP;
 894                         g->mt_comp2 = MT_COMP_UNSUPP;
 895                         g->mt_comp3 = MT_COMP_UNSUPP;
 896                 } else {
 897                         if ((softc->flags & SA_FLAG_COMP_ENABLED) == 0) {
 898                                 g->mt_comp = MT_COMP_DISABLED;
 899                         } else {
 900                                 g->mt_comp = softc->comp_algorithm;
 901                         }
 902                         g->mt_comp0 = softc->comp_algorithm;
 903                         g->mt_comp1 = softc->comp_algorithm;
 904                         g->mt_comp2 = softc->comp_algorithm;
 905                         g->mt_comp3 = softc->comp_algorithm;
 906                 }
 907                 g->mt_density = softc->media_density;
 908                 g->mt_density0 = softc->media_density;
 909                 g->mt_density1 = softc->media_density;
 910                 g->mt_density2 = softc->media_density;
 911                 g->mt_density3 = softc->media_density;
 912                 g->mt_blksiz = softc->media_blksize;
 913                 g->mt_blksiz0 = softc->media_blksize;
 914                 g->mt_blksiz1 = softc->media_blksize;
 915                 g->mt_blksiz2 = softc->media_blksize;
 916                 g->mt_blksiz3 = softc->media_blksize;
 917                 g->mt_fileno = softc->fileno;
 918                 g->mt_blkno = softc->blkno;
 919                 g->mt_dsreg = (short) softc->dsreg;
 920                 /*
 921                  * Yes, we know that this is likely to overflow
 922                  */
 923                 if (softc->last_resid_was_io) {
 924                         if ((g->mt_resid = (short) softc->last_io_resid) != 0) {
 925                                 if (SA_IS_CTRL(dev) == 0 || didlockperiph) {
 926                                         softc->last_io_resid = 0;
 927                                 }
 928                         }
 929                 } else {
 930                         if ((g->mt_resid = (short)softc->last_ctl_resid) != 0) {
 931                                 if (SA_IS_CTRL(dev) == 0 || didlockperiph) {
 932                                         softc->last_ctl_resid = 0;
 933                                 }
 934                         }
 935                 }
 936                 error = 0;
 937                 break;
 938         }
 939         case MTIOCERRSTAT:
 940         {
 941                 struct scsi_tape_errors *sep =
 942                     &((union mterrstat *)addr)->scsi_errstat;
 943
 944                 CAM_DEBUG(periph->path, CAM_DEBUG_TRACE,
 945                     ("saioctl: MTIOCERRSTAT\n"));
 946
 947                 bzero(sep, sizeof(*sep));
 948                 sep->io_resid = softc->last_io_resid;
 949                 bcopy((caddr_t) &softc->last_io_sense, sep->io_sense,
 950                     sizeof (sep->io_sense));
 951                 bcopy((caddr_t) &softc->last_io_cdb, sep->io_cdb,
 952                     sizeof (sep->io_cdb));
 953                 sep->ctl_resid = softc->last_ctl_resid;
 954                 bcopy((caddr_t) &softc->last_ctl_sense, sep->ctl_sense,
 955                     sizeof (sep->ctl_sense));
 956                 bcopy((caddr_t) &softc->last_ctl_cdb, sep->ctl_cdb,
 957                     sizeof (sep->ctl_cdb));
 958
 959                 if (SA_IS_CTRL(dev) == 0 || didlockperiph)
 960                         bzero((caddr_t) &softc->errinfo,
 961                             sizeof (softc->errinfo));
 962                 error = 0;
 963                 break;
 964         }
 965         case MTIOCTOP:
 966         {
 967                 struct mtop *mt;
 968                 int    count;
 969
 970                 mt = (struct mtop *)addr;
 971
 972                 CAM_DEBUG(periph->path, CAM_DEBUG_TRACE,
 973                          ("saioctl: op=0x%x count=0x%x\n",
 974                           mt->mt_op, mt->mt_count));
 975
 976                 count = mt->mt_count;
 977                 switch (mt->mt_op) {
 978                 case MTWEOF:    /* write an end-of-file marker */
 979                         /*
 980                          * We don't need to clear the SA_FLAG_TAPE_WRITTEN
 981                          * flag because by keeping track of filemarks
 982                          * we have last written we know ehether or not
 983                          * we need to write more when we close the device.
 984                          */
 985                         error = sawritefilemarks(periph, count, FALSE);
 986                         break;
 987                 case MTWSS:     /* write a setmark */
 988                         error = sawritefilemarks(periph, count, TRUE);
 989                         break;
 990                 case MTBSR:     /* backward space record */
 991                 case MTFSR:     /* forward space record */
 992                 case MTBSF:     /* backward space file */
 993                 case MTFSF:     /* forward space file */
 994                 case MTBSS:     /* backward space setmark */
 995                 case MTFSS:     /* forward space setmark */
 996                 case MTEOD:     /* space to end of recorded medium */
 997                 {
 998                         int nmarks;
 999
1000                         spaceop = SS_FILEMARKS;
1001                         nmarks = softc->filemarks;
1002                         error = sacheckeod(periph);
1003                         if (error) {
1004                                 xpt_print_path(periph->path);
1005                                 kprintf("EOD check prior to spacing failed\n");
1006                                 softc->flags |= SA_FLAG_EIO_PENDING;
1007                                 break;
1008                         }
1009                         nmarks -= softc->filemarks;
1010                         switch(mt->mt_op) {
1011                         case MTBSR:
1012                                 count = -count;
1013                                 /* FALLTHROUGH */
1014                         case MTFSR:
1015                                 spaceop = SS_BLOCKS;
1016                                 break;
1017                         case MTBSF:
1018                                 count = -count;
1019                                 /* FALLTHROUGH */
1020                         case MTFSF:
1021                                 break;
1022                         case MTBSS:
1023                                 count = -count;
1024                                 /* FALLTHROUGH */
1025                         case MTFSS:
1026                                 spaceop = SS_SETMARKS;
1027                                 break;
1028                         case MTEOD:
1029                                 spaceop = SS_EOD;
1030                                 count = 0;
1031                                 nmarks = 0;
1032                                 break;
1033                         default:
1034                                 error = EINVAL;
1035                                 break;
1036                         }
1037                         if (error)
1038                                 break;
1039
1040                         nmarks = softc->filemarks;
1041                         /*
1042                          * XXX: Why are we checking again?
1043                          */
1044                         error = sacheckeod(periph);
1045                         if (error)
1046                                 break;
1047                         nmarks -= softc->filemarks;
1048                         error = saspace(periph, count - nmarks, spaceop);
1049                         /*
1050                          * At this point, clear that we've written the tape
1051                          * and that we've written any filemarks. We really
1052                          * don't know what the applications wishes to do next-
1053                          * the sacheckeod's will make sure we terminated the
1054                          * tape correctly if we'd been writing, but the next
1055                          * action the user application takes will set again
1056                          * whether we need to write filemarks.
1057                          */
1058                         softc->flags &=
1059                             ~(SA_FLAG_TAPE_WRITTEN|SA_FLAG_TAPE_FROZEN);
1060                         softc->filemarks = 0;
1061                         break;
1062                 }
1063                 case MTREW:     /* rewind */
1064                         sacheckeod(periph);
1065                         error = sarewind(periph);
1066                         /* see above */
1067                         softc->flags &=
1068                             ~(SA_FLAG_TAPE_WRITTEN|SA_FLAG_TAPE_FROZEN);
1069                         softc->flags &= ~SA_FLAG_ERR_PENDING;
1070                         softc->filemarks = 0;
1071                         break;
1072                 case MTERASE:   /* erase */
1073                         error = saerase(periph, count);
1074                         softc->flags &=
1075                             ~(SA_FLAG_TAPE_WRITTEN|SA_FLAG_TAPE_FROZEN);
1076                         softc->flags &= ~SA_FLAG_ERR_PENDING;
1077                         break;
1078                 case MTRETENS:  /* re-tension tape */
1079                         error = saretension(periph);
1080                         softc->flags &=
1081                             ~(SA_FLAG_TAPE_WRITTEN|SA_FLAG_TAPE_FROZEN);
1082                         softc->flags &= ~SA_FLAG_ERR_PENDING;
1083                         break;
1084                 case MTOFFL:    /* rewind and put the drive offline */
1085
1086                         sacheckeod(periph);
1087                         /* see above */
1088                         softc->flags &= ~SA_FLAG_TAPE_WRITTEN;
1089                         softc->filemarks = 0;
1090
1091                         error = sarewind(periph);
1092                         /* clear the frozen flag anyway */
1093                         softc->flags &= ~SA_FLAG_TAPE_FROZEN;
1094
1095                         /*
1096                          * Be sure to allow media removal before ejecting.
1097                          */
1098
1099                         saprevent(periph, PR_ALLOW);
1100                         if (error == 0) {
1101                                 error = saloadunload(periph, FALSE);
1102                                 if (error == 0) {
1103                                         softc->flags &= ~SA_FLAG_TAPE_MOUNTED;
1104                                 }
1105                         }
1106                         break;
1107
1108                 case MTNOP:     /* no operation, sets status only */
1109                 case MTCACHE:   /* enable controller cache */
1110                 case MTNOCACHE: /* disable controller cache */
1111                         error = 0;
1112                         break;
1113
1114                 case MTSETBSIZ: /* Set block size for device */
1115
1116                         error = sasetparams(periph, SA_PARAM_BLOCKSIZE, count,
1117                                             0, 0, 0);
1118                         if (error == 0) {
1119                                 softc->last_media_blksize =
1120                                     softc->media_blksize;
1121                                 softc->media_blksize = count;
1122                                 if (count) {
1123                                         softc->flags |= SA_FLAG_FIXED;
1124                                         if (powerof2(count)) {
1125                                                 softc->blk_shift =
1126                                                     ffs(count) - 1;
1127                                                 softc->blk_mask = count - 1;
1128                                         } else {
1129                                                 softc->blk_mask = ~0;
1130                                                 softc->blk_shift = 0;
1131                                         }
1132                                         /*
1133                                          * Make the user's desire 'persistent'.
1134                                          */
1135                                         softc->quirks &= ~SA_QUIRK_VARIABLE;
1136                                         softc->quirks |= SA_QUIRK_FIXED;
1137                                 } else {
1138                                         softc->flags &= ~SA_FLAG_FIXED;
1139                                         if (softc->max_blk == 0) {
1140                                                 softc->max_blk = ~0;
1141                                         }
1142                                         softc->blk_shift = 0;
1143                                         if (softc->blk_gran != 0) {
1144                                                 softc->blk_mask =
1145                                                     softc->blk_gran - 1;
1146                                         } else {
1147                                                 softc->blk_mask = 0;
1148                                         }
1149                                         /*
1150                                          * Make the user's desire 'persistent'.
1151                                          */
1152                                         softc->quirks |= SA_QUIRK_VARIABLE;
1153                                         softc->quirks &= ~SA_QUIRK_FIXED;
1154                                 }
1155                         }
1156                         break;
1157                 case MTSETDNSTY:        /* Set density for device and mode */
1158                         if (count > UCHAR_MAX) {
1159                                 error = EINVAL;
1160                                 break;
1161                         } else {
1162                                 error = sasetparams(periph, SA_PARAM_DENSITY,
1163                                                     0, count, 0, 0);
1164                         }
1165                         break;
1166                 case MTCOMP:    /* enable compression */
1167                         /*
1168                          * Some devices don't support compression, and
1169                          * don't like it if you ask them for the
1170                          * compression page.
1171                          */
1172                         if ((softc->quirks & SA_QUIRK_NOCOMP) ||
1173                             (softc->flags & SA_FLAG_COMP_UNSUPP)) {
1174                                 error = ENODEV;
1175                                 break;
1176                         }
1177                         error = sasetparams(periph, SA_PARAM_COMPRESSION,
1178                             0, 0, count, SF_NO_PRINT);
1179                         break;
1180                 default:
1181                         error = EINVAL;
1182                 }
1183                 break;
1184         }
1185         case MTIOCIEOT:
1186         case MTIOCEEOT:
1187                 error = 0;
1188                 break;
1189         case MTIOCRDSPOS:
1190                 error = sardpos(periph, 0, (u_int32_t *) addr);
1191                 break;
1192         case MTIOCRDHPOS:
1193                 error = sardpos(periph, 1, (u_int32_t *) addr);
1194                 break;
1195         case MTIOCSLOCATE:
1196                 error = sasetpos(periph, 0, (u_int32_t *) addr);
1197                 break;
1198         case MTIOCHLOCATE:
1199                 error = sasetpos(periph, 1, (u_int32_t *) addr);
1200                 break;
1201         case MTIOCGETEOTMODEL:
1202                 error = 0;
1203                 if (softc->quirks & SA_QUIRK_1FM)
1204                         mode = 1;
1205                 else
1206                         mode = 2;
1207                 *((u_int32_t *) addr) = mode;
1208                 break;
1209         case MTIOCSETEOTMODEL:
1210                 error = 0;
1211                 switch (*((u_int32_t *) addr)) {
1212                 case 1:
1213                         softc->quirks &= ~SA_QUIRK_2FM;
1214                         softc->quirks |= SA_QUIRK_1FM;
1215                         break;
1216                 case 2:
1217                         softc->quirks &= ~SA_QUIRK_1FM;
1218                         softc->quirks |= SA_QUIRK_2FM;
1219                         break;
1220                 default:
1221                         error = EINVAL;
1222                         break;
1223                 }
1224                 break;
1225         default:
1226                 error = cam_periph_ioctl(periph, ap->a_cmd, addr, saerror);
1227                 break;
1228         }
1229
1230         /*
1231          * Check to see if we cleared a frozen state
1232          */
1233         if (error == 0 && (softc->flags & SA_FLAG_TAPE_FROZEN)) {
1234                 switch(ap->a_cmd) {
1235                 case MTIOCRDSPOS:
1236                 case MTIOCRDHPOS:
1237                 case MTIOCSLOCATE:
1238                 case MTIOCHLOCATE:
1239                         softc->fileno = (daddr_t) -1;
1240                         softc->blkno = (daddr_t) -1;
1241                         softc->flags &= ~SA_FLAG_TAPE_FROZEN;
1242                         xpt_print_path(periph->path);
1243                         kprintf("tape state now unfrozen.\n");
1244                         break;
1245                 default:
1246                         break;
1247                 }
1248         }
1249         if (didlockperiph) {
1250                 cam_periph_unlock(periph);
1251         }
1252         return (error);
1253 }
1254
1255 static void
1256 sainit(void)
1257 {
1258         cam_status status;
1259         struct cam_path *path;
1260
1261         /*
1262          * Create our extend array for storing the devices we attach to.
1263          */
1264         saperiphs = cam_extend_new();
1265         if (saperiphs == NULL) {
1266                 kprintf("sa: Failed to alloc extend array!\n");
1267                 return;
1268         }
1269
1270         /*
1271          * Install a global async callback.
1272          */
1273         status = xpt_create_path(&path, NULL, CAM_XPT_PATH_ID,
1274                                  CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD);
1275
1276         if (status == CAM_REQ_CMP) {
1277                 /* Register the async callbacks of interrest */
1278                 struct ccb_setasync csa; /*
1279                                           * This is an immediate CCB,
1280                                           * so using the stack is OK
1281                                           */
1282                 xpt_setup_ccb(&csa.ccb_h, path, 5);
1283                 csa.ccb_h.func_code = XPT_SASYNC_CB;
1284                 csa.event_enable = AC_FOUND_DEVICE;
1285                 csa.callback = saasync;
1286                 csa.callback_arg = NULL;
1287                 xpt_action((union ccb *)&csa);
1288                 status = csa.ccb_h.status;
1289                 xpt_free_path(path);
1290         }
1291
1292         if (status != CAM_REQ_CMP) {
1293                 kprintf("sa: Failed to attach master async callback "
1294                        "due to status 0x%x!\n", status);
1295         }
1296 }
1297
1298 static void
1299 saoninvalidate(struct cam_periph *periph)
1300 {
1301         struct sa_softc *softc;
1302         struct buf *q_bp;
1303         struct bio *q_bio;
1304         struct ccb_setasync csa;
1305
1306         softc = (struct sa_softc *)periph->softc;
1307
1308         /*
1309          * De-register any async callbacks.
1310          */
1311         xpt_setup_ccb(&csa.ccb_h, periph->path,
1312                       /* priority */ 5);
1313         csa.ccb_h.func_code = XPT_SASYNC_CB;
1314         csa.event_enable = 0;
1315         csa.callback = saasync;
1316         csa.callback_arg = periph;
1317         xpt_action((union ccb *)&csa);
1318
1319         softc->flags |= SA_FLAG_INVALID;
1320
1321         /*
1322          * We need to be in a critical section here to keep the buffer
1323          * queue from being modified while we traverse it.
1324          */
1325         crit_enter();
1326
1327         /*
1328          * Return all queued I/O with ENXIO.
1329          * XXX Handle any transactions queued to the card
1330          *     with XPT_ABORT_CCB.
1331          */
1332         while ((q_bio = bioq_first(&softc->bio_queue)) != NULL){
1333                 bioq_remove(&softc->bio_queue, q_bio);
1334                 q_bp = q_bio->bio_buf;
1335                 q_bp->b_resid = q_bp->b_bcount;
1336                 q_bp->b_error = ENXIO;
1337                 q_bp->b_flags |= B_ERROR;
1338                 biodone(q_bio);
1339         }
1340         softc->queue_count = 0;
1341         crit_exit();
1342
1343         xpt_print_path(periph->path);
1344         kprintf("lost device\n");
1345
1346 }
1347
1348 static void
1349 sacleanup(struct cam_periph *periph)
1350 {
1351         struct sa_softc *softc;
1352
1353         softc = (struct sa_softc *)periph->softc;
1354
1355         devstat_remove_entry(&softc->device_stats);
1356
1357         cam_extend_release(saperiphs, periph->unit_number);
1358         xpt_print_path(periph->path);
1359         kprintf("removing device entry\n");
1360         dev_ops_remove(&sa_ops, SA_UNITMASK, SA_UNIT(periph->unit_number));
1361         kfree(softc, M_DEVBUF);
1362 }
1363
1364 static void
1365 saasync(void *callback_arg, u_int32_t code,
1366         struct cam_path *path, void *arg)
1367 {
1368         struct cam_periph *periph;
1369
1370         periph = (struct cam_periph *)callback_arg;
1371         switch (code) {
1372         case AC_FOUND_DEVICE:
1373         {
1374                 struct ccb_getdev *cgd;
1375                 cam_status status;
1376
1377                 cgd = (struct ccb_getdev *)arg;
1378                 if (cgd == NULL)
1379                         break;
1380
1381                 if (SID_TYPE(&cgd->inq_data) != T_SEQUENTIAL)
1382                         break;
1383
1384                 /*
1385                  * Allocate a peripheral instance for
1386                  * this device and start the probe
1387                  * process.
1388                  */
1389                 status = cam_periph_alloc(saregister, saoninvalidate,
1390                                           sacleanup, sastart,
1391                                           "sa", CAM_PERIPH_BIO, cgd->ccb_h.path,
1392                                           saasync, AC_FOUND_DEVICE, cgd);
1393
1394                 if (status != CAM_REQ_CMP
1395                  && status != CAM_REQ_INPROG)
1396                         kprintf("saasync: Unable to probe new device "
1397                                 "due to status 0x%x\n", status);
1398                 break;
1399         }
1400         default:
1401                 cam_periph_async(periph, code, path, arg);
1402                 break;
1403         }
1404 }
1405
1406 static cam_status
1407 saregister(struct cam_periph *periph, void *arg)
1408 {
1409         struct sa_softc *softc;
1410         struct ccb_setasync csa;
1411         struct ccb_getdev *cgd;
1412         caddr_t match;
1413         int i;
1414
1415         cgd = (struct ccb_getdev *)arg;
1416         if (periph == NULL) {
1417                 kprintf("saregister: periph was NULL!!\n");
1418                 return (CAM_REQ_CMP_ERR);
1419         }
1420
1421         if (cgd == NULL) {
1422                 kprintf("saregister: no getdev CCB, can't register device\n");
1423                 return (CAM_REQ_CMP_ERR);
1424         }
1425
1426         softc = kmalloc(sizeof (*softc), M_DEVBUF, M_INTWAIT | M_ZERO);
1427         softc->scsi_rev = SID_ANSI_REV(&cgd->inq_data);
1428         softc->state = SA_STATE_NORMAL;
1429         softc->fileno = (daddr_t) -1;
1430         softc->blkno = (daddr_t) -1;
1431
1432         bioq_init(&softc->bio_queue);
1433         periph->softc = softc;
1434         cam_extend_set(saperiphs, periph->unit_number, periph);
1435
1436         /*
1437          * See if this device has any quirks.
1438          */
1439         match = cam_quirkmatch((caddr_t)&cgd->inq_data,
1440                                (caddr_t)sa_quirk_table,
1441                                sizeof(sa_quirk_table)/sizeof(*sa_quirk_table),
1442                                sizeof(*sa_quirk_table), scsi_inquiry_match);
1443
1444         if (match != NULL) {
1445                 softc->quirks = ((struct sa_quirk_entry *)match)->quirks;
1446                 softc->last_media_blksize =
1447                     ((struct sa_quirk_entry *)match)->prefblk;
1448 #ifdef  CAMDEBUG
1449                 xpt_print_path(periph->path);
1450                 kprintf("found quirk entry %d\n", (int)
1451                     (((struct sa_quirk_entry *) match) - sa_quirk_table));
1452 #endif
1453         } else
1454                 softc->quirks = SA_QUIRK_NONE;
1455
1456         /*
1457          * The SA driver supports a blocksize, but we don't know the
1458          * blocksize until we media is inserted.  So, set a flag to
1459          * indicate that the blocksize is unavailable right now.
1460          */
1461         devstat_add_entry(&softc->device_stats, "sa", periph->unit_number, 0,
1462             DEVSTAT_BS_UNAVAILABLE, SID_TYPE(&cgd->inq_data) |
1463             DEVSTAT_TYPE_IF_SCSI, DEVSTAT_PRIORITY_TAPE);
1464
1465         dev_ops_add(&sa_ops, SA_UNITMASK, SA_UNIT(periph->unit_number));
1466         make_dev(&sa_ops, SAMINOR(SA_CTLDEV,
1467             periph->unit_number, 0, SA_ATYPE_R), UID_ROOT, GID_OPERATOR,
1468             0660, "%s%d.ctl", periph->periph_name, periph->unit_number);
1469
1470         make_dev(&sa_ops, SAMINOR(SA_NOT_CTLDEV,
1471             periph->unit_number, 0, SA_ATYPE_R), UID_ROOT, GID_OPERATOR,
1472             0660, "%s%d", periph->periph_name, periph->unit_number);
1473
1474         make_dev(&sa_ops, SAMINOR(SA_NOT_CTLDEV,
1475             periph->unit_number, 0, SA_ATYPE_NR), UID_ROOT, GID_OPERATOR,
1476             0660, "n%s%d", periph->periph_name, periph->unit_number);
1477
1478         make_dev(&sa_ops, SAMINOR(SA_NOT_CTLDEV,
1479             periph->unit_number, 0, SA_ATYPE_ER), UID_ROOT, GID_OPERATOR,
1480             0660, "e%s%d", periph->periph_name, periph->unit_number);
1481
1482         for (i = 0; i < SA_NUM_MODES; i++) {
1483
1484                 make_dev(&sa_ops,
1485                     SAMINOR(SA_NOT_CTLDEV, periph->unit_number, i, SA_ATYPE_R),
1486                     UID_ROOT, GID_OPERATOR, 0660, "%s%d.%d",
1487                     periph->periph_name, periph->unit_number, i);
1488
1489                 make_dev(&sa_ops,
1490                     SAMINOR(SA_NOT_CTLDEV, periph->unit_number, i, SA_ATYPE_NR),
1491                     UID_ROOT, GID_OPERATOR, 0660, "n%s%d.%d",
1492                     periph->periph_name, periph->unit_number, i);
1493
1494
1495                 make_dev(&sa_ops,
1496                     SAMINOR(SA_NOT_CTLDEV, periph->unit_number, i, SA_ATYPE_ER),
1497                     UID_ROOT, GID_OPERATOR, 0660, "e%s%d.%d",
1498                     periph->periph_name, periph->unit_number, i);
1499         }
1500
1501         /*
1502          * Add an async callback so that we get
1503          * notified if this device goes away.
1504          */
1505         xpt_setup_ccb(&csa.ccb_h, periph->path, /* priority */ 5);
1506         csa.ccb_h.func_code = XPT_SASYNC_CB;
1507         csa.event_enable = AC_LOST_DEVICE;
1508         csa.callback = saasync;
1509         csa.callback_arg = periph;
1510         xpt_action((union ccb *)&csa);
1511
1512         xpt_announce_periph(periph, NULL);
1513
1514         return (CAM_REQ_CMP);
1515 }
1516
1517 static void
1518 sastart(struct cam_periph *periph, union ccb *start_ccb)
1519 {
1520         struct sa_softc *softc;
1521
1522         softc = (struct sa_softc *)periph->softc;
1523
1524         CAM_DEBUG(periph->path, CAM_DEBUG_INFO, ("sastart"));
1525
1526
1527         switch (softc->state) {
1528         case SA_STATE_NORMAL:
1529         {
1530                 /* Pull a buffer from the queue and get going on it */
1531                 struct buf *bp;
1532                 struct bio *bio;
1533
1534                 /*
1535                  * See if there is a buf with work for us to do..
1536                  */
1537                 crit_enter();
1538                 bio = bioq_first(&softc->bio_queue);
1539                 if (periph->immediate_priority <= periph->pinfo.priority) {
1540                         CAM_DEBUG_PRINT(CAM_DEBUG_SUBTRACE,
1541                                         ("queuing for immediate ccb\n"));
1542                         Set_CCB_Type(start_ccb, SA_CCB_WAITING);
1543                         SLIST_INSERT_HEAD(&periph->ccb_list, &start_ccb->ccb_h,
1544                                           periph_links.sle);
1545                         periph->immediate_priority = CAM_PRIORITY_NONE;
1546                         crit_exit();
1547                         wakeup(&periph->ccb_list);
1548                 } else if (bio == NULL) {
1549                         crit_exit();
1550                         xpt_release_ccb(start_ccb);
1551                 } else if ((softc->flags & SA_FLAG_ERR_PENDING) != 0) {
1552                         struct bio *done_bio;
1553 again:
1554                         softc->queue_count--;
1555                         bioq_remove(&softc->bio_queue, bio);
1556                         bp = bio->bio_buf;
1557                         bp->b_resid = bp->b_bcount;
1558                         done_bio = bio;
1559                         if ((softc->flags & SA_FLAG_EOM_PENDING) != 0) {
1560                                 /*
1561                                  * We now just clear errors in this case
1562                                  * and let the residual be the notifier.
1563                                  */
1564                                 bp->b_error = 0;
1565                         } else if ((softc->flags & SA_FLAG_EOF_PENDING) != 0) {
1566                                 /*
1567                                  * This can only happen if we're reading
1568                                  * in fixed length mode. In this case,
1569                                  * we dump the rest of the list the
1570                                  * same way.
1571                                  */
1572                                 bp->b_error = 0;
1573                                 if (bioq_first(&softc->bio_queue) != NULL) {
1574                                         biodone(done_bio);
1575                                         goto again;
1576                                 }
1577                         } else if ((softc->flags & SA_FLAG_EIO_PENDING) != 0) {
1578                                 bp->b_error = EIO;
1579                                 bp->b_flags |= B_ERROR;
1580                         }
1581                         bio = bioq_first(&softc->bio_queue);
1582                         /*
1583                          * Only if we have no other buffers queued up
1584                          * do we clear the pending error flag.
1585                          */
1586                         if (bio == NULL)
1587                                 softc->flags &= ~SA_FLAG_ERR_PENDING;
1588                         CAM_DEBUG(periph->path, CAM_DEBUG_INFO,
1589                             ("sastart- ERR_PENDING now 0x%x, bio is %sNULL, "
1590                             "%d more buffers queued up\n",
1591                             (softc->flags & SA_FLAG_ERR_PENDING),
1592                             (bio != NULL)? "not " : " ", softc->queue_count));
1593                         crit_exit();
1594                         xpt_release_ccb(start_ccb);
1595                         biodone(done_bio);
1596                 } else {
1597                         u_int32_t length;
1598
1599                         bioq_remove(&softc->bio_queue, bio);
1600                         bp = bio->bio_buf;
1601                         softc->queue_count--;
1602
1603                         if ((softc->flags & SA_FLAG_FIXED) != 0) {
1604                                 if (softc->blk_shift != 0) {
1605                                         length =
1606                                             bp->b_bcount >> softc->blk_shift;
1607                                 } else if (softc->media_blksize != 0) {
1608                                         length =
1609                                             bp->b_bcount / softc->media_blksize;
1610                                 } else {
1611                                         bp->b_error = EIO;
1612                                         xpt_print_path(periph->path);
1613                                         kprintf("zero blocksize for "
1614                                             "FIXED length writes?\n");
1615                                         crit_exit();
1616                                         biodone(bio);
1617                                         break;
1618                                 }
1619                                 CAM_DEBUG(periph->path, CAM_DEBUG_INFO,
1620                                     ("Fixed Record Count is %d\n", length));
1621                         } else {
1622                                 length = bp->b_bcount;
1623                                 CAM_DEBUG(start_ccb->ccb_h.path, CAM_DEBUG_INFO,
1624                                     ("Variable Record Count is %d\n", length));
1625                         }
1626                         devstat_start_transaction(&softc->device_stats);
1627                         /*
1628                          * Some people have theorized that we should
1629                          * suppress illegal length indication if we are
1630                          * running in variable block mode so that we don't
1631                          * have to request sense every time our requested
1632                          * block size is larger than the written block.
1633                          * The residual information from the ccb allows
1634                          * us to identify this situation anyway.  The only
1635                          * problem with this is that we will not get
1636                          * information about blocks that are larger than
1637                          * our read buffer unless we set the block size
1638                          * in the mode page to something other than 0.
1639                          *
1640                          * I believe that this is a non-issue. If user apps
1641                          * don't adjust their read size to match our record
1642                          * size, that's just life. Anyway, the typical usage
1643                          * would be to issue, e.g., 64KB reads and occasionally
1644                          * have to do deal with 512 byte or 1KB intermediate
1645                          * records.
1646                          */
1647                         softc->dsreg = (bp->b_cmd == BUF_CMD_READ) ?
1648                             MTIO_DSREG_RD : MTIO_DSREG_WR;
1649                         scsi_sa_read_write(&start_ccb->csio, 0, sadone,
1650                             MSG_SIMPLE_Q_TAG, (bp->b_cmd == BUF_CMD_READ) != 0,
1651                             FALSE, (softc->flags & SA_FLAG_FIXED) != 0,
1652                             length, bp->b_data, bp->b_bcount, SSD_FULL_SIZE,
1653                             IO_TIMEOUT);
1654                         start_ccb->ccb_h.ccb_pflags &= ~SA_POSITION_UPDATED;
1655                         Set_CCB_Type(start_ccb, SA_CCB_BUFFER_IO);
1656                         start_ccb->ccb_h.ccb_bio = bio;
1657                         bio = bioq_first(&softc->bio_queue);
1658                         crit_exit();
1659                         xpt_action(start_ccb);
1660                 }
1661
1662                 if (bio != NULL) {
1663                         /* Have more work to do, so ensure we stay scheduled */
1664                         xpt_schedule(periph, 1);
1665                 }
1666                 break;
1667         }
1668         case SA_STATE_ABNORMAL:
1669         default:
1670                 panic("state 0x%x in sastart", softc->state);
1671                 break;
1672         }
1673 }
1674
1675
1676 static void
1677 sadone(struct cam_periph *periph, union ccb *done_ccb)
1678 {
1679         struct sa_softc *softc;
1680         struct ccb_scsiio *csio;
1681
1682         softc = (struct sa_softc *)periph->softc;
1683         csio = &done_ccb->csio;
1684         switch (CCB_Type(csio)) {
1685         case SA_CCB_BUFFER_IO:
1686         {
1687                 struct buf *bp;
1688                 struct bio *bio;
1689                 int error;
1690
1691                 softc->dsreg = MTIO_DSREG_REST;
1692                 bio = (struct bio *)done_ccb->ccb_h.ccb_bio;
1693                 bp = bio->bio_buf;
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                         struct bio *q_bio;
1707
1708                         /*
1709                          * Catastrophic error. Mark the tape as frozen
1710                          * (we no longer know tape position).
1711                          *
1712                          * Return all queued I/O with EIO, and unfreeze
1713                          * our queue so that future transactions that
1714                          * attempt to fix this problem can get to the
1715                          * device.
1716                          *
1717                          */
1718
1719                         crit_enter();
1720                         softc->flags |= SA_FLAG_TAPE_FROZEN;
1721                         while ((q_bio = bioq_first(&softc->bio_queue)) != NULL) {
1722                                 bioq_remove(&softc->bio_queue, q_bio);
1723                                 q_bp = q_bio->bio_buf;
1724                                 q_bp->b_resid = q_bp->b_bcount;
1725                                 q_bp->b_error = EIO;
1726                                 q_bp->b_flags |= B_ERROR;
1727                                 biodone(q_bio);
1728                         }
1729                         crit_exit();
1730                 }
1731                 if (error != 0) {
1732                         bp->b_resid = bp->b_bcount;
1733                         bp->b_error = error;
1734                         bp->b_flags |= B_ERROR;
1735                         /*
1736                          * In the error case, position is updated in saerror.
1737                          */
1738                 } else {
1739                         bp->b_resid = csio->resid;
1740                         bp->b_error = 0;
1741                         if (csio->resid != 0) {
1742                                 bp->b_flags |= B_ERROR;
1743                         }
1744                         if (bp->b_cmd != BUF_CMD_READ) {
1745                                 softc->flags |= SA_FLAG_TAPE_WRITTEN;
1746                                 softc->filemarks = 0;
1747                         }
1748                         if (!(csio->ccb_h.ccb_pflags & SA_POSITION_UPDATED) &&
1749                             (softc->blkno != (daddr_t) -1)) {
1750                                 if ((softc->flags & SA_FLAG_FIXED) != 0) {
1751                                         u_int32_t l;
1752                                         if (softc->blk_shift != 0) {
1753                                                 l = bp->b_bcount >>
1754                                                         softc->blk_shift;
1755                                         } else {
1756                                                 l = bp->b_bcount /
1757                                                         softc->media_blksize;
1758                                         }
1759                                         softc->blkno += (daddr_t) l;
1760                                 } else {
1761                                         softc->blkno++;
1762                                 }
1763                         }
1764                 }
1765                 /*
1766                  * If we had an error (immediate or pending),
1767                  * release the device queue now.
1768                  */
1769                 if (error || (softc->flags & SA_FLAG_ERR_PENDING))
1770                         cam_release_devq(done_ccb->ccb_h.path, 0, 0, 0, 0);
1771 #ifdef  CAMDEBUG
1772                 if (error || bp->b_resid) {
1773                         CAM_DEBUG(periph->path, CAM_DEBUG_INFO,
1774                                   ("error %d resid %d count %d\n", error,
1775                                   bp->b_resid, bp->b_bcount));
1776                 }
1777 #endif
1778                 devstat_end_transaction_buf(&softc->device_stats, bp);
1779                 biodone(bio);
1780                 break;
1781         }
1782         case SA_CCB_WAITING:
1783         {
1784                 /* Caller will release the CCB */
1785                 wakeup(&done_ccb->ccb_h.cbfcnp);
1786                 return;
1787         }
1788         }
1789         xpt_release_ccb(done_ccb);
1790 }
1791
1792 /*
1793  * Mount the tape (make sure it's ready for I/O).
1794  */
1795 static int
1796 samount(struct cam_periph *periph, int oflags, cdev_t dev)
1797 {
1798         struct  sa_softc *softc;
1799         union   ccb *ccb;
1800         int     error;
1801
1802         /*
1803          * oflags can be checked for 'kind' of open (read-only check) - later
1804          * dev can be checked for a control-mode or compression open - later
1805          */
1806         UNUSED_PARAMETER(oflags);
1807         UNUSED_PARAMETER(dev);
1808
1809
1810         softc = (struct sa_softc *)periph->softc;
1811
1812         /*
1813          * This should determine if something has happend since the last
1814          * open/mount that would invalidate the mount. We do *not* want
1815          * to retry this command- we just want the status. But we only
1816          * do this if we're mounted already- if we're not mounted,
1817          * we don't care about the unit read state and can instead use
1818          * this opportunity to attempt to reserve the tape unit.
1819          */
1820
1821         if (softc->flags & SA_FLAG_TAPE_MOUNTED) {
1822                 ccb = cam_periph_getccb(periph, 1);
1823                 scsi_test_unit_ready(&ccb->csio, 0, sadone,
1824                     MSG_SIMPLE_Q_TAG, SSD_FULL_SIZE, IO_TIMEOUT);
1825                 error = cam_periph_runccb(ccb, saerror, 0, SF_NO_PRINT,
1826                     &softc->device_stats);
1827                 QFRLS(ccb);
1828                 if (error == ENXIO) {
1829                         softc->flags &= ~SA_FLAG_TAPE_MOUNTED;
1830                         scsi_test_unit_ready(&ccb->csio, 0, sadone,
1831                             MSG_SIMPLE_Q_TAG, SSD_FULL_SIZE, IO_TIMEOUT);
1832                         error = cam_periph_runccb(ccb, saerror, 0, SF_NO_PRINT,
1833                             &softc->device_stats);
1834                         QFRLS(ccb);
1835                 } else if (error) {
1836                         /*
1837                          * We don't need to freeze the tape because we
1838                          * will now attempt to rewind/load it.
1839                          */
1840                         softc->flags &= ~SA_FLAG_TAPE_MOUNTED;
1841                         if (CAM_DEBUGGED(ccb->ccb_h.path, CAM_DEBUG_INFO)) {
1842                                 xpt_print_path(ccb->ccb_h.path);
1843                                 kprintf("error %d on TUR in samount\n", error);
1844                         }
1845                 }
1846         } else {
1847                 error = sareservereleaseunit(periph, TRUE);
1848                 if (error) {
1849                         return (error);
1850                 }
1851                 ccb = cam_periph_getccb(periph, 1);
1852                 scsi_test_unit_ready(&ccb->csio, 0, sadone,
1853                     MSG_SIMPLE_Q_TAG, SSD_FULL_SIZE, IO_TIMEOUT);
1854                 error = cam_periph_runccb(ccb, saerror, 0, SF_NO_PRINT,
1855                     &softc->device_stats);
1856                 QFRLS(ccb);
1857         }
1858
1859         if ((softc->flags & SA_FLAG_TAPE_MOUNTED) == 0) {
1860                 struct scsi_read_block_limits_data *rblim = NULL;
1861                 int comp_enabled, comp_supported;
1862                 u_int8_t write_protect, guessing = 0;
1863
1864                 /*
1865                  * Clear out old state.
1866                  */
1867                 softc->flags &= ~(SA_FLAG_TAPE_WP|SA_FLAG_TAPE_WRITTEN|
1868                                   SA_FLAG_ERR_PENDING|SA_FLAG_COMP_ENABLED|
1869                                   SA_FLAG_COMP_SUPP|SA_FLAG_COMP_UNSUPP);
1870                 softc->filemarks = 0;
1871
1872                 /*
1873                  * *Very* first off, make sure we're loaded to BOT.
1874                  */
1875                 scsi_load_unload(&ccb->csio, 2, sadone, MSG_SIMPLE_Q_TAG, FALSE,
1876                     FALSE, FALSE, 1, SSD_FULL_SIZE, REWIND_TIMEOUT);
1877                 error = cam_periph_runccb(ccb, saerror, 0, SF_NO_PRINT,
1878                     &softc->device_stats);
1879                 QFRLS(ccb);
1880
1881                 /*
1882                  * In case this doesn't work, do a REWIND instead
1883                  */
1884                 if (error) {
1885                         scsi_rewind(&ccb->csio, 2, sadone, MSG_SIMPLE_Q_TAG,
1886                             FALSE, SSD_FULL_SIZE, REWIND_TIMEOUT);
1887                         error = cam_periph_runccb(ccb, saerror, 0, SF_NO_PRINT,
1888                                 &softc->device_stats);
1889                         QFRLS(ccb);
1890                 }
1891                 if (error) {
1892                         xpt_release_ccb(ccb);
1893                         goto exit;
1894                 }
1895
1896                 /*
1897                  * Do a dummy test read to force access to the
1898                  * media so that the drive will really know what's
1899                  * there. We actually don't really care what the
1900                  * blocksize on tape is and don't expect to really
1901                  * read a full record.
1902                  */
1903                 rblim = kmalloc(8192, M_TEMP, M_INTWAIT);
1904
1905                 if ((softc->quirks & SA_QUIRK_NODREAD) == 0) {
1906                         scsi_sa_read_write(&ccb->csio, 0, sadone,
1907                             MSG_SIMPLE_Q_TAG, 1, FALSE, 0, 8192,
1908                             (void *) rblim, 8192, SSD_FULL_SIZE,
1909                             IO_TIMEOUT);
1910                         cam_periph_runccb(ccb, saerror, 0, SF_NO_PRINT,
1911                             &softc->device_stats);
1912                         QFRLS(ccb);
1913                         scsi_rewind(&ccb->csio, 1, sadone, MSG_SIMPLE_Q_TAG,
1914                             FALSE, SSD_FULL_SIZE, REWIND_TIMEOUT);
1915                         error = cam_periph_runccb(ccb, saerror, CAM_RETRY_SELTO,
1916                             SF_NO_PRINT | SF_RETRY_UA,
1917                             &softc->device_stats);
1918                         QFRLS(ccb);
1919                         if (error) {
1920                                 xpt_print_path(ccb->ccb_h.path);
1921                                 kprintf("unable to rewind after test read\n");
1922                                 xpt_release_ccb(ccb);
1923                                 goto exit;
1924                         }
1925                 }
1926
1927                 /*
1928                  * Next off, determine block limits.
1929                  */
1930                 scsi_read_block_limits(&ccb->csio, 5, sadone, MSG_SIMPLE_Q_TAG,
1931                     rblim, SSD_FULL_SIZE, SCSIOP_TIMEOUT);
1932
1933                 error = cam_periph_runccb(ccb, saerror, CAM_RETRY_SELTO,
1934                     SF_NO_PRINT | SF_RETRY_UA, &softc->device_stats);
1935
1936                 QFRLS(ccb);
1937                 xpt_release_ccb(ccb);
1938
1939                 if (error != 0) {
1940                         /*
1941                          * If it's less than SCSI-2, READ BLOCK LIMITS is not
1942                          * a MANDATORY command. Anyway- it doesn't matter-
1943                          * we can proceed anyway.
1944                          */
1945                         softc->blk_gran = 0;
1946                         softc->max_blk = ~0;
1947                         softc->min_blk = 0;
1948                 } else {
1949                         if (softc->scsi_rev >= SCSI_REV_SPC) {
1950                                 softc->blk_gran = RBL_GRAN(rblim);
1951                         } else {
1952                                 softc->blk_gran = 0;
1953                         }
1954                         /*
1955                          * We take max_blk == min_blk to mean a default to
1956                          * fixed mode- but note that whatever we get out of
1957                          * sagetparams below will actually determine whether
1958                          * we are actually *in* fixed mode.
1959                          */
1960                         softc->max_blk = scsi_3btoul(rblim->maximum);
1961                         softc->min_blk = scsi_2btoul(rblim->minimum);
1962
1963
1964                 }
1965                 /*
1966                  * Next, perform a mode sense to determine
1967                  * current density, blocksize, compression etc.
1968                  */
1969                 error = sagetparams(periph, SA_PARAM_ALL,
1970                                     &softc->media_blksize,
1971                                     &softc->media_density,
1972                                     &softc->media_numblks,
1973                                     &softc->buffer_mode, &write_protect,
1974                                     &softc->speed, &comp_supported,
1975                                     &comp_enabled, &softc->comp_algorithm,
1976                                     NULL);
1977
1978                 if (error != 0) {
1979                         /*
1980                          * We could work a little harder here. We could
1981                          * adjust our attempts to get information. It
1982                          * might be an ancient tape drive. If someone
1983                          * nudges us, we'll do that.
1984                          */
1985                         goto exit;
1986                 }
1987
1988                 /*
1989                  * If no quirk has determined that this is a device that is
1990                  * preferred to be in fixed or variable mode, now is the time
1991                  * to find out.
1992                  */
1993                 if ((softc->quirks & (SA_QUIRK_FIXED|SA_QUIRK_VARIABLE)) == 0) {
1994                         guessing = 1;
1995                         /*
1996                          * This could be expensive to find out. Luckily we
1997                          * only need to do this once. If we start out in
1998                          * 'default' mode, try and set ourselves to one
1999                          * of the densities that would determine a wad
2000                          * of other stuff. Go from highest to lowest.
2001                          */
2002                         if (softc->media_density == SCSI_DEFAULT_DENSITY) {
2003                                 int i;
2004                                 static u_int8_t ctry[] = {
2005                                         SCSI_DENSITY_HALFINCH_PE,
2006                                         SCSI_DENSITY_HALFINCH_6250C,
2007                                         SCSI_DENSITY_HALFINCH_6250,
2008                                         SCSI_DENSITY_HALFINCH_1600,
2009                                         SCSI_DENSITY_HALFINCH_800,
2010                                         SCSI_DENSITY_QIC_4GB,
2011                                         SCSI_DENSITY_QIC_2GB,
2012                                         SCSI_DENSITY_QIC_525_320,
2013                                         SCSI_DENSITY_QIC_150,
2014                                         SCSI_DENSITY_QIC_120,
2015                                         SCSI_DENSITY_QIC_24,
2016                                         SCSI_DENSITY_QIC_11_9TRK,
2017                                         SCSI_DENSITY_QIC_11_4TRK,
2018                                         SCSI_DENSITY_QIC_1320,
2019                                         SCSI_DENSITY_QIC_3080,
2020                                         0
2021                                 };
2022                                 for (i = 0; ctry[i]; i++) {
2023                                         error = sasetparams(periph,
2024                                             SA_PARAM_DENSITY, 0, ctry[i],
2025                                             0, SF_NO_PRINT);
2026                                         if (error == 0) {
2027                                                 softc->media_density = ctry[i];
2028                                                 break;
2029                                         }
2030                                 }
2031                         }
2032                         switch (softc->media_density) {
2033                         case SCSI_DENSITY_QIC_11_4TRK:
2034                         case SCSI_DENSITY_QIC_11_9TRK:
2035                         case SCSI_DENSITY_QIC_24:
2036                         case SCSI_DENSITY_QIC_120:
2037                         case SCSI_DENSITY_QIC_150:
2038                         case SCSI_DENSITY_QIC_525_320:
2039                         case SCSI_DENSITY_QIC_1320:
2040                         case SCSI_DENSITY_QIC_3080:
2041                                 softc->quirks &= ~SA_QUIRK_2FM;
2042                                 softc->quirks |= SA_QUIRK_FIXED|SA_QUIRK_1FM;
2043                                 softc->last_media_blksize = 512;
2044                                 break;
2045                         case SCSI_DENSITY_QIC_4GB:
2046                         case SCSI_DENSITY_QIC_2GB:
2047                                 softc->quirks &= ~SA_QUIRK_2FM;
2048                                 softc->quirks |= SA_QUIRK_FIXED|SA_QUIRK_1FM;
2049                                 softc->last_media_blksize = 1024;
2050                                 break;
2051                         default:
2052                                 softc->last_media_blksize =
2053                                     softc->media_blksize;
2054                                 softc->quirks |= SA_QUIRK_VARIABLE;
2055                                 break;
2056                         }
2057                 }
2058
2059                 /*
2060                  * If no quirk has determined that this is a device that needs
2061                  * to have 2 Filemarks at EOD, now is the time to find out.
2062                  */
2063
2064                 if ((softc->quirks & SA_QUIRK_2FM) == 0) {
2065                         switch (softc->media_density) {
2066                         case SCSI_DENSITY_HALFINCH_800:
2067                         case SCSI_DENSITY_HALFINCH_1600:
2068                         case SCSI_DENSITY_HALFINCH_6250:
2069                         case SCSI_DENSITY_HALFINCH_6250C:
2070                         case SCSI_DENSITY_HALFINCH_PE:
2071                                 softc->quirks &= ~SA_QUIRK_1FM;
2072                                 softc->quirks |= SA_QUIRK_2FM;
2073                                 break;
2074                         default:
2075                                 break;
2076                         }
2077                 }
2078
2079                 /*
2080                  * Now validate that some info we got makes sense.
2081                  */
2082                 if ((softc->max_blk < softc->media_blksize) ||
2083                     (softc->min_blk > softc->media_blksize &&
2084                     softc->media_blksize)) {
2085                         xpt_print_path(ccb->ccb_h.path);
2086                         kprintf("BLOCK LIMITS (%d..%d) could not match current "
2087                             "block settings (%d)- adjusting\n", softc->min_blk,
2088                             softc->max_blk, softc->media_blksize);
2089                         softc->max_blk = softc->min_blk =
2090                             softc->media_blksize;
2091                 }
2092
2093                 /*
2094                  * Now put ourselves into the right frame of mind based
2095                  * upon quirks...
2096                  */
2097 tryagain:
2098                 /*
2099                  * If we want to be in FIXED mode and our current blocksize
2100                  * is not equal to our last blocksize (if nonzero), try and
2101                  * set ourselves to this last blocksize (as the 'preferred'
2102                  * block size).  The initial quirkmatch at registry sets the
2103                  * initial 'last' blocksize. If, for whatever reason, this
2104                  * 'last' blocksize is zero, set the blocksize to 512,
2105                  * or min_blk if that's larger.
2106                  */
2107                 if ((softc->quirks & SA_QUIRK_FIXED) &&
2108                     (softc->quirks & SA_QUIRK_NO_MODESEL) == 0 &&
2109                     (softc->media_blksize != softc->last_media_blksize)) {
2110                         softc->media_blksize = softc->last_media_blksize;
2111                         if (softc->media_blksize == 0) {
2112                                 softc->media_blksize = 512;
2113                                 if (softc->media_blksize < softc->min_blk) {
2114                                         softc->media_blksize = softc->min_blk;
2115                                 }
2116                         }
2117                         error = sasetparams(periph, SA_PARAM_BLOCKSIZE,
2118                             softc->media_blksize, 0, 0, SF_NO_PRINT);
2119                         if (error) {
2120                                 xpt_print_path(ccb->ccb_h.path);
2121                                 kprintf("unable to set fixed blocksize to %d\n",
2122                                      softc->media_blksize);
2123                                 goto exit;
2124                         }
2125                 }
2126
2127                 if ((softc->quirks & SA_QUIRK_VARIABLE) &&
2128                     (softc->media_blksize != 0)) {
2129                         softc->last_media_blksize = softc->media_blksize;
2130                         softc->media_blksize = 0;
2131                         error = sasetparams(periph, SA_PARAM_BLOCKSIZE,
2132                             0, 0, 0, SF_NO_PRINT);
2133                         if (error) {
2134                                 /*
2135                                  * If this fails and we were guessing, just
2136                                  * assume that we got it wrong and go try
2137                                  * fixed block mode. Don't even check against
2138                                  * density code at this point.
2139                                  */
2140                                 if (guessing) {
2141                                         softc->quirks &= ~SA_QUIRK_VARIABLE;
2142                                         softc->quirks |= SA_QUIRK_FIXED;
2143                                         if (softc->last_media_blksize == 0)
2144                                                 softc->last_media_blksize = 512;
2145                                         goto tryagain;
2146                                 }
2147                                 xpt_print_path(ccb->ccb_h.path);
2148                                 kprintf("unable to set variable blocksize\n");
2149                                 goto exit;
2150                         }
2151                 }
2152
2153                 /*
2154                  * Now that we have the current block size,
2155                  * set up some parameters for sastart's usage.
2156                  */
2157                 if (softc->media_blksize) {
2158                         softc->flags |= SA_FLAG_FIXED;
2159                         if (powerof2(softc->media_blksize)) {
2160                                 softc->blk_shift =
2161                                     ffs(softc->media_blksize) - 1;
2162                                 softc->blk_mask = softc->media_blksize - 1;
2163                         } else {
2164                                 softc->blk_mask = ~0;
2165                                 softc->blk_shift = 0;
2166                         }
2167                 } else {
2168                         /*
2169                          * The SCSI-3 spec allows 0 to mean "unspecified".
2170                          * The SCSI-1 spec allows 0 to mean 'infinite'.
2171                          *
2172                          * Either works here.
2173                          */
2174                         if (softc->max_blk == 0) {
2175                                 softc->max_blk = ~0;
2176                         }
2177                         softc->blk_shift = 0;
2178                         if (softc->blk_gran != 0) {
2179                                 softc->blk_mask = softc->blk_gran - 1;
2180                         } else {
2181                                 softc->blk_mask = 0;
2182                         }
2183                 }
2184
2185                 if (write_protect)
2186                         softc->flags |= SA_FLAG_TAPE_WP;
2187
2188                 if (comp_supported) {
2189                         if (softc->saved_comp_algorithm == 0)
2190                                 softc->saved_comp_algorithm =
2191                                     softc->comp_algorithm;
2192                         softc->flags |= SA_FLAG_COMP_SUPP;
2193                         if (comp_enabled)
2194                                 softc->flags |= SA_FLAG_COMP_ENABLED;
2195                 } else
2196                         softc->flags |= SA_FLAG_COMP_UNSUPP;
2197
2198                 if ((softc->buffer_mode == SMH_SA_BUF_MODE_NOBUF) &&
2199                     (softc->quirks & SA_QUIRK_NO_MODESEL) == 0) {
2200                         error = sasetparams(periph, SA_PARAM_BUFF_MODE, 0,
2201                             0, 0, SF_NO_PRINT);
2202                         if (error == 0) {
2203                                 softc->buffer_mode = SMH_SA_BUF_MODE_SIBUF;
2204                         } else {
2205                                 xpt_print_path(ccb->ccb_h.path);
2206                                 kprintf("unable to set buffered mode\n");
2207                         }
2208                         error = 0;      /* not an error */
2209                 }
2210
2211
2212                 if (error == 0) {
2213                         softc->flags |= SA_FLAG_TAPE_MOUNTED;
2214                 }
2215 exit:
2216                 if (rblim != NULL)
2217                         kfree(rblim, M_TEMP);
2218
2219                 if (error != 0) {
2220                         softc->dsreg = MTIO_DSREG_NIL;
2221                 } else {
2222                         softc->fileno = softc->blkno = 0;
2223                         softc->dsreg = MTIO_DSREG_REST;
2224                 }
2225 #ifdef  SA_1FM_AT_EOD
2226                 if ((softc->quirks & SA_QUIRK_2FM) == 0)
2227                         softc->quirks |= SA_QUIRK_1FM;
2228 #else
2229                 if ((softc->quirks & SA_QUIRK_1FM) == 0)
2230                         softc->quirks |= SA_QUIRK_2FM;
2231 #endif
2232         } else
2233                 xpt_release_ccb(ccb);
2234
2235         /*
2236          * If we return an error, we're not mounted any more,
2237          * so release any device reservation.
2238          */
2239         if (error != 0) {
2240                 sareservereleaseunit(periph, FALSE);
2241         } else {
2242                 /*
2243                  * Clear I/O residual.
2244                  */
2245                 softc->last_io_resid = 0;
2246                 softc->last_ctl_resid = 0;
2247         }
2248         return (error);
2249 }
2250
2251 /*
2252  * How many filemarks do we need to write if we were to terminate the
2253  * tape session right now? Note that this can be a negative number
2254  */
2255
2256 static int
2257 samarkswanted(struct cam_periph *periph)
2258 {
2259         int     markswanted;
2260         struct  sa_softc *softc;
2261
2262         softc = (struct sa_softc *)periph->softc;
2263         markswanted = 0;
2264         if ((softc->flags & SA_FLAG_TAPE_WRITTEN) != 0) {
2265                 markswanted++;
2266                 if (softc->quirks & SA_QUIRK_2FM)
2267                         markswanted++;
2268         }
2269         markswanted -= softc->filemarks;
2270         return (markswanted);
2271 }
2272
2273 static int
2274 sacheckeod(struct cam_periph *periph)
2275 {
2276         int     error;
2277         int     markswanted;
2278
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                 }
2392                 /* FALLTHROUGH */
2393         default:
2394                 return (cam_periph_error(ccb, cflgs, sflgs, &softc->saved_ccb));
2395         }
2396
2397         /*
2398          * Handle filemark, end of tape, mismatched record sizes....
2399          * From this point out, we're only handling read/write cases.
2400          * Handle writes && reads differently.
2401          */
2402
2403         if (csio->cdb_io.cdb_bytes[0] == SA_WRITE) {
2404                 if (sense_key == SSD_KEY_VOLUME_OVERFLOW) {
2405                         csio->resid = resid;
2406                         error = ENOSPC;
2407                 } else if (sense->flags & SSD_EOM) {
2408                         softc->flags |= SA_FLAG_EOM_PENDING;
2409                         /*
2410                          * Grotesque as it seems, the few times
2411                          * I've actually seen a non-zero resid,
2412                          * the tape drive actually lied and had
2413                          * writtent all the data!.
2414                          */
2415                         csio->resid = 0;
2416                 }
2417         } else {
2418                 csio->resid = resid;
2419                 if (sense_key == SSD_KEY_BLANK_CHECK) {
2420                         if (softc->quirks & SA_QUIRK_1FM) {
2421                                 error = 0;
2422                                 softc->flags |= SA_FLAG_EOM_PENDING;
2423                         } else {
2424                                 error = EIO;
2425                         }
2426                 } else if (sense->flags & SSD_FILEMARK) {
2427                         if (softc->flags & SA_FLAG_FIXED) {
2428                                 error = -1;
2429                                 softc->flags |= SA_FLAG_EOF_PENDING;
2430                         }
2431                         /*
2432                          * Unconditionally, if we detected a filemark on a read,
2433                          * mark that we've run moved a file ahead.
2434                          */
2435                         if (softc->fileno != (daddr_t) -1) {
2436                                 softc->fileno++;
2437                                 softc->blkno = 0;
2438                                 csio->ccb_h.ccb_pflags |= SA_POSITION_UPDATED;
2439                         }
2440                 }
2441         }
2442
2443         /*
2444          * Incorrect Length usually applies to read, but can apply to writes.
2445          */
2446         if (error == 0 && (sense->flags & SSD_ILI)) {
2447                 if (info < 0) {
2448                         xpt_print_path(csio->ccb_h.path);
2449                         kprintf(toobig, csio->dxfer_len - info);
2450                         csio->resid = csio->dxfer_len;
2451                         error = EIO;
2452                 } else {
2453                         csio->resid = resid;
2454                         if (softc->flags & SA_FLAG_FIXED) {
2455                                 softc->flags |= SA_FLAG_EIO_PENDING;
2456                         }
2457                         /*
2458                          * Bump the block number if we hadn't seen a filemark.
2459                          * Do this independent of errors (we've moved anyway).
2460                          */
2461                         if ((sense->flags & SSD_FILEMARK) == 0) {
2462                                 if (softc->blkno != (daddr_t) -1) {
2463                                         softc->blkno++;
2464                                         csio->ccb_h.ccb_pflags |=
2465                                            SA_POSITION_UPDATED;
2466                                 }
2467                         }
2468                 }
2469         }
2470
2471         if (error <= 0) {
2472                 /*
2473                  * Unfreeze the queue if frozen as we're not returning anything
2474                  * to our waiters that would indicate an I/O error has occurred
2475                  * (yet).
2476                  */
2477                 QFRLS(ccb);
2478                 error = 0;
2479         }
2480         return (error);
2481 }
2482
2483 static int
2484 sagetparams(struct cam_periph *periph, sa_params params_to_get,
2485             u_int32_t *blocksize, u_int8_t *density, u_int32_t *numblocks,
2486             int *buff_mode, u_int8_t *write_protect, u_int8_t *speed,
2487             int *comp_supported, int *comp_enabled, u_int32_t *comp_algorithm,
2488             sa_comp_t *tcs)
2489 {
2490         union ccb *ccb;
2491         void *mode_buffer;
2492         struct scsi_mode_header_6 *mode_hdr;
2493         struct scsi_mode_blk_desc *mode_blk;
2494         int mode_buffer_len;
2495         struct sa_softc *softc;
2496         u_int8_t cpage;
2497         int error;
2498         cam_status status;
2499
2500         softc = (struct sa_softc *)periph->softc;
2501         ccb = cam_periph_getccb(periph, 1);
2502         if (softc->quirks & SA_QUIRK_NO_CPAGE)
2503                 cpage = SA_DEVICE_CONFIGURATION_PAGE;
2504         else
2505                 cpage = SA_DATA_COMPRESSION_PAGE;
2506
2507 retry:
2508         mode_buffer_len = sizeof(*mode_hdr) + sizeof(*mode_blk);
2509
2510         if (params_to_get & SA_PARAM_COMPRESSION) {
2511                 if (softc->quirks & SA_QUIRK_NOCOMP) {
2512                         *comp_supported = FALSE;
2513                         params_to_get &= ~SA_PARAM_COMPRESSION;
2514                 } else
2515                         mode_buffer_len += sizeof (sa_comp_t);
2516         }
2517
2518         mode_buffer = kmalloc(mode_buffer_len, M_TEMP, M_INTWAIT | M_ZERO);
2519         mode_hdr = (struct scsi_mode_header_6 *)mode_buffer;
2520         mode_blk = (struct scsi_mode_blk_desc *)&mode_hdr[1];
2521
2522         /* it is safe to retry this */
2523         scsi_mode_sense(&ccb->csio, 5, sadone, MSG_SIMPLE_Q_TAG, FALSE,
2524             SMS_PAGE_CTRL_CURRENT, (params_to_get & SA_PARAM_COMPRESSION) ?
2525             cpage : SMS_VENDOR_SPECIFIC_PAGE, mode_buffer, mode_buffer_len,
2526             SSD_FULL_SIZE, SCSIOP_TIMEOUT);
2527
2528         error = cam_periph_runccb(ccb, saerror, 0, SF_NO_PRINT,
2529             &softc->device_stats);
2530         QFRLS(ccb);
2531
2532         status = ccb->ccb_h.status & CAM_STATUS_MASK;
2533
2534         if (error == EINVAL && (params_to_get & SA_PARAM_COMPRESSION) != 0) {
2535                 /*
2536                  * Hmm. Let's see if we can try another page...
2537                  * If we've already done that, give up on compression
2538                  * for this device and remember this for the future
2539                  * and attempt the request without asking for compression
2540                  * info.
2541                  */
2542                 if (cpage == SA_DATA_COMPRESSION_PAGE) {
2543                         cpage = SA_DEVICE_CONFIGURATION_PAGE;
2544                         goto retry;
2545                 }
2546                 softc->quirks |= SA_QUIRK_NOCOMP;
2547                 kfree(mode_buffer, M_TEMP);
2548                 goto retry;
2549         } else if (status == CAM_SCSI_STATUS_ERROR) {
2550                 /* Tell the user about the fatal error. */
2551                 scsi_sense_print(&ccb->csio);
2552                 goto sagetparamsexit;
2553         }
2554
2555         /*
2556          * If the user only wants the compression information, and
2557          * the device doesn't send back the block descriptor, it's
2558          * no big deal.  If the user wants more than just
2559          * compression, though, and the device doesn't pass back the
2560          * block descriptor, we need to send another mode sense to
2561          * get the block descriptor.
2562          */
2563         if ((mode_hdr->blk_desc_len == 0) &&
2564             (params_to_get & SA_PARAM_COMPRESSION) &&
2565             (params_to_get & ~(SA_PARAM_COMPRESSION))) {
2566
2567                 /*
2568                  * Decrease the mode buffer length by the size of
2569                  * the compression page, to make sure the data
2570                  * there doesn't get overwritten.
2571                  */
2572                 mode_buffer_len -= sizeof (sa_comp_t);
2573
2574                 /*
2575                  * Now move the compression page that we presumably
2576                  * got back down the memory chunk a little bit so
2577                  * it doesn't get spammed.
2578                  */
2579                 bcopy(&mode_hdr[0], &mode_hdr[1], sizeof (sa_comp_t));
2580                 bzero(&mode_hdr[0], sizeof (mode_hdr[0]));
2581
2582                 /*
2583                  * Now, we issue another mode sense and just ask
2584                  * for the block descriptor, etc.
2585                  */
2586
2587                 scsi_mode_sense(&ccb->csio, 2, sadone, MSG_SIMPLE_Q_TAG, FALSE,
2588                     SMS_PAGE_CTRL_CURRENT, SMS_VENDOR_SPECIFIC_PAGE,
2589                     mode_buffer, mode_buffer_len, SSD_FULL_SIZE,
2590                     SCSIOP_TIMEOUT);
2591
2592                 error = cam_periph_runccb(ccb, saerror, 0, SF_NO_PRINT,
2593                     &softc->device_stats);
2594                 QFRLS(ccb);
2595
2596                 if (error != 0)
2597                         goto sagetparamsexit;
2598         }
2599
2600         if (params_to_get & SA_PARAM_BLOCKSIZE)
2601                 *blocksize = scsi_3btoul(mode_blk->blklen);
2602
2603         if (params_to_get & SA_PARAM_NUMBLOCKS)
2604                 *numblocks = scsi_3btoul(mode_blk->nblocks);
2605
2606         if (params_to_get & SA_PARAM_BUFF_MODE)
2607                 *buff_mode = mode_hdr->dev_spec & SMH_SA_BUF_MODE_MASK;
2608
2609         if (params_to_get & SA_PARAM_DENSITY)
2610                 *density = mode_blk->density;
2611
2612         if (params_to_get & SA_PARAM_WP)
2613                 *write_protect = (mode_hdr->dev_spec & SMH_SA_WP)? TRUE : FALSE;
2614
2615         if (params_to_get & SA_PARAM_SPEED)
2616                 *speed = mode_hdr->dev_spec & SMH_SA_SPEED_MASK;
2617
2618         if (params_to_get & SA_PARAM_COMPRESSION) {
2619                 sa_comp_t *ntcs = (sa_comp_t *) &mode_blk[1];
2620                 if (cpage == SA_DATA_COMPRESSION_PAGE) {
2621                         struct scsi_data_compression_page *cp = &ntcs->dcomp;
2622                         *comp_supported =
2623                             (cp->dce_and_dcc & SA_DCP_DCC)? TRUE : FALSE;
2624                         *comp_enabled =
2625                             (cp->dce_and_dcc & SA_DCP_DCE)? TRUE : FALSE;
2626                         *comp_algorithm = scsi_4btoul(cp->comp_algorithm);
2627                 } else {
2628                         struct scsi_dev_conf_page *cp = &ntcs->dconf;
2629                         /*
2630                          * We don't really know whether this device supports
2631                          * Data Compression if the the algorithm field is
2632                          * zero. Just say we do.
2633                          */
2634                         *comp_supported = TRUE;
2635                         *comp_enabled =
2636                             (cp->sel_comp_alg != SA_COMP_NONE)? TRUE : FALSE;
2637                         *comp_algorithm = cp->sel_comp_alg;
2638                 }
2639                 if (tcs != NULL)
2640                         bcopy(ntcs, tcs, sizeof (sa_comp_t));
2641         }
2642
2643         if (CAM_DEBUGGED(periph->path, CAM_DEBUG_INFO)) {
2644                 int idx;
2645                 char *xyz = mode_buffer;
2646                 xpt_print_path(periph->path);
2647                 kprintf("Mode Sense Data=");
2648                 for (idx = 0; idx < mode_buffer_len; idx++)
2649                         kprintf(" 0x%02x", xyz[idx] & 0xff);
2650                 kprintf("\n");
2651         }
2652
2653 sagetparamsexit:
2654
2655         xpt_release_ccb(ccb);
2656         kfree(mode_buffer, M_TEMP);
2657         return (error);
2658 }
2659
2660 /*
2661  * The purpose of this function is to set one of four different parameters
2662  * for a tape drive:
2663  *      - blocksize
2664  *      - density
2665  *      - compression / compression algorithm
2666  *      - buffering mode
2667  *
2668  * The assumption is that this will be called from saioctl(), and therefore
2669  * from a process context.  Thus the waiting malloc calls below.  If that
2670  * assumption ever changes, the malloc calls should be changed to be
2671  * NOWAIT mallocs.
2672  *
2673  * Any or all of the four parameters may be set when this function is
2674  * called.  It should handle setting more than one parameter at once.
2675  */
2676 static int
2677 sasetparams(struct cam_periph *periph, sa_params params_to_set,
2678             u_int32_t blocksize, u_int8_t density, u_int32_t calg,
2679             u_int32_t sense_flags)
2680 {
2681         struct sa_softc *softc;
2682         u_int32_t current_blocksize;
2683         u_int32_t current_calg;
2684         u_int8_t current_density;
2685         u_int8_t current_speed;
2686         int comp_enabled, comp_supported;
2687         void *mode_buffer;
2688         int mode_buffer_len;
2689         struct scsi_mode_header_6 *mode_hdr;
2690         struct scsi_mode_blk_desc *mode_blk;
2691         sa_comp_t *ccomp, *cpage;
2692         int buff_mode;
2693         union ccb *ccb = NULL;
2694         int error;
2695
2696         softc = (struct sa_softc *)periph->softc;
2697
2698         ccomp = kmalloc(sizeof (sa_comp_t), M_TEMP, M_INTWAIT);
2699
2700         /*
2701          * Since it doesn't make sense to set the number of blocks, or
2702          * write protection, we won't try to get the current value.  We
2703          * always want to get the blocksize, so we can set it back to the
2704          * proper value.
2705          */
2706         error = sagetparams(periph,
2707             params_to_set | SA_PARAM_BLOCKSIZE | SA_PARAM_SPEED,
2708             &current_blocksize, &current_density, NULL, &buff_mode, NULL,
2709             &current_speed, &comp_supported, &comp_enabled,
2710             &current_calg, ccomp);
2711
2712         if (error != 0) {
2713                 kfree(ccomp, M_TEMP);
2714                 return (error);
2715         }
2716
2717         mode_buffer_len = sizeof(*mode_hdr) + sizeof(*mode_blk);
2718         if (params_to_set & SA_PARAM_COMPRESSION)
2719                 mode_buffer_len += sizeof (sa_comp_t);
2720
2721         mode_buffer = kmalloc(mode_buffer_len, M_TEMP, M_INTWAIT | M_ZERO);
2722
2723         mode_hdr = (struct scsi_mode_header_6 *)mode_buffer;
2724         mode_blk = (struct scsi_mode_blk_desc *)&mode_hdr[1];
2725
2726         ccb = cam_periph_getccb(periph, 1);
2727
2728 retry:
2729
2730         if (params_to_set & SA_PARAM_COMPRESSION) {
2731                 if (mode_blk) {
2732                         cpage = (sa_comp_t *)&mode_blk[1];
2733                 } else {
2734                         cpage = (sa_comp_t *)&mode_hdr[1];
2735                 }
2736                 bcopy(ccomp, cpage, sizeof (sa_comp_t));
2737                 cpage->hdr.pagecode &= ~0x80;
2738         } else
2739                 cpage = NULL;
2740
2741         /*
2742          * If the caller wants us to set the blocksize, use the one they
2743          * pass in.  Otherwise, use the blocksize we got back from the
2744          * mode select above.
2745          */
2746         if (mode_blk) {
2747                 if (params_to_set & SA_PARAM_BLOCKSIZE)
2748                         scsi_ulto3b(blocksize, mode_blk->blklen);
2749                 else
2750                         scsi_ulto3b(current_blocksize, mode_blk->blklen);
2751
2752                 /*
2753                  * Set density if requested, else preserve old density.
2754                  * SCSI_SAME_DENSITY only applies to SCSI-2 or better
2755                  * devices, else density we've latched up in our softc.
2756                  */
2757                 if (params_to_set & SA_PARAM_DENSITY) {
2758                         mode_blk->density = density;
2759                 } else if (softc->scsi_rev > SCSI_REV_CCS) {
2760                         mode_blk->density = SCSI_SAME_DENSITY;
2761                 } else {
2762                         mode_blk->density = softc->media_density;
2763                 }
2764         }
2765
2766         /*
2767          * For mode selects, these two fields must be zero.
2768          */
2769         mode_hdr->data_length = 0;
2770         mode_hdr->medium_type = 0;
2771
2772         /* set the speed to the current value */
2773         mode_hdr->dev_spec = current_speed;
2774
2775         /* set single-initiator buffering mode */
2776         mode_hdr->dev_spec |= SMH_SA_BUF_MODE_SIBUF;
2777
2778         if (mode_blk)
2779                 mode_hdr->blk_desc_len = sizeof(struct scsi_mode_blk_desc);
2780         else
2781                 mode_hdr->blk_desc_len = 0;
2782
2783         /*
2784          * First, if the user wants us to set the compression algorithm or
2785          * just turn compression on, check to make sure that this drive
2786          * supports compression.
2787          */
2788         if (params_to_set & SA_PARAM_COMPRESSION) {
2789                 /*
2790                  * If the compression algorithm is 0, disable compression.
2791                  * If the compression algorithm is non-zero, enable
2792                  * compression and set the compression type to the
2793                  * specified compression algorithm, unless the algorithm is
2794                  * MT_COMP_ENABLE.  In that case, we look at the
2795                  * compression algorithm that is currently set and if it is
2796                  * non-zero, we leave it as-is.  If it is zero, and we have
2797                  * saved a compression algorithm from a time when
2798                  * compression was enabled before, set the compression to
2799                  * the saved value.
2800                  */
2801                 switch (ccomp->hdr.pagecode & ~0x80) {
2802                 case SA_DATA_COMPRESSION_PAGE:
2803                 if (ccomp->dcomp.dce_and_dcc & SA_DCP_DCC) {
2804                         struct scsi_data_compression_page *dcp = &cpage->dcomp;
2805                         if (calg == 0) {
2806                                 /*
2807                                  * Disable compression, but leave the
2808                                  * decompression and the capability bit
2809                                  * alone.
2810                                  */
2811                                 dcp->dce_and_dcc = SA_DCP_DCC;
2812                                 dcp->dde_and_red |= SA_DCP_DDE;
2813                                 break;
2814                         }
2815                         /* enable compression && decompression */
2816                         dcp->dce_and_dcc = SA_DCP_DCE | SA_DCP_DCC;
2817                         dcp->dde_and_red |= SA_DCP_DDE;
2818                         /*
2819                          * If there, use compression algorithm from caller.
2820                          * Otherwise, if there's a saved compression algorithm
2821                          * and there is no current algorithm, use the saved
2822                          * algorithm. Else parrot back what we got and hope
2823                          * for the best.
2824                          */
2825                         if (calg != MT_COMP_ENABLE) {
2826                                 scsi_ulto4b(calg, dcp->comp_algorithm);
2827                                 scsi_ulto4b(calg, dcp->decomp_algorithm);
2828                         } else if (scsi_4btoul(dcp->comp_algorithm) == 0 &&
2829                             softc->saved_comp_algorithm != 0) {
2830                                 scsi_ulto4b(softc->saved_comp_algorithm,
2831                                     dcp->comp_algorithm);
2832                                 scsi_ulto4b(softc->saved_comp_algorithm,
2833                                     dcp->decomp_algorithm);
2834                         }
2835                         break;
2836                 }
2837                 /* XXX: fall-through intentional ? */
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                         kprintf("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                                 kfree(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                 kprintf("Err%d, Mode Select Data=", error);
2896                 for (idx = 0; idx < mode_buffer_len; idx++)
2897                         kprintf(" 0x%02x", xyz[idx] & 0xff);
2898                 kprintf("\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                 kfree(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         kfree(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 }