sys/cam/scsi/scsi_sa.c

   1 /*-
   2  * Implementation of SCSI Sequential Access Peripheral driver for CAM.
   3  *
   4  * Copyright (c) 1999, 2000 Matthew Jacob
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions, and the following disclaimer,
  12  *    without modification, immediately at the beginning of the file.
  13  * 2. The name of the author may not be used to endorse or promote products
  14  *    derived from this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
  20  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  */
  28
  29 #include <sys/cdefs.h>
  30 __FBSDID("$FreeBSD$");
  31
  32 #include <sys/param.h>
  33 #include <sys/queue.h>
  34 #ifdef _KERNEL
  35 #include <sys/systm.h>
  36 #include <sys/kernel.h>
  37 #endif
  38 #include <sys/types.h>
  39 #include <sys/time.h>
  40 #include <sys/bio.h>
  41 #include <sys/limits.h>
  42 #include <sys/malloc.h>
  43 #include <sys/mtio.h>
  44 #ifdef _KERNEL
  45 #include <sys/conf.h>
  46 #include <sys/sysctl.h>
  47 #include <sys/taskqueue.h>
  48 #endif
  49 #include <sys/fcntl.h>
  50 #include <sys/devicestat.h>
  51
  52 #ifndef _KERNEL
  53 #include <stdio.h>
  54 #include <string.h>
  55 #endif
  56
  57 #include <cam/cam.h>
  58 #include <cam/cam_ccb.h>
  59 #include <cam/cam_periph.h>
  60 #include <cam/cam_xpt_periph.h>
  61 #include <cam/cam_debug.h>
  62
  63 #include <cam/scsi/scsi_all.h>
  64 #include <cam/scsi/scsi_message.h>
  65 #include <cam/scsi/scsi_sa.h>
  66
  67 #ifdef _KERNEL
  68
  69 #include <opt_sa.h>
  70
  71 #ifndef SA_IO_TIMEOUT
  72 #define SA_IO_TIMEOUT           4
  73 #endif
  74 #ifndef SA_SPACE_TIMEOUT
  75 #define SA_SPACE_TIMEOUT        1 * 60
  76 #endif
  77 #ifndef SA_REWIND_TIMEOUT
  78 #define SA_REWIND_TIMEOUT       2 * 60
  79 #endif
  80 #ifndef SA_ERASE_TIMEOUT
  81 #define SA_ERASE_TIMEOUT        4 * 60
  82 #endif
  83
  84 #define SCSIOP_TIMEOUT          (60 * 1000)     /* not an option */
  85
  86 #define IO_TIMEOUT              (SA_IO_TIMEOUT * 60 * 1000)
  87 #define REWIND_TIMEOUT          (SA_REWIND_TIMEOUT * 60 * 1000)
  88 #define ERASE_TIMEOUT           (SA_ERASE_TIMEOUT * 60 * 1000)
  89 #define SPACE_TIMEOUT           (SA_SPACE_TIMEOUT * 60 * 1000)
  90
  91 /*
  92  * Additional options that can be set for config: SA_1FM_AT_EOT
  93  */
  94
  95 #ifndef UNUSED_PARAMETER
  96 #define UNUSED_PARAMETER(x)     x = x
  97 #endif
  98
  99 #define QFRLS(ccb)      \
 100         if (((ccb)->ccb_h.status & CAM_DEV_QFRZN) != 0) \
 101                 cam_release_devq((ccb)->ccb_h.path, 0, 0, 0, FALSE)
 102
 103 /*
 104  * Driver states
 105  */
 106
 107 static MALLOC_DEFINE(M_SCSISA, "SCSI sa", "SCSI sequential access buffers");
 108
 109 typedef enum {
 110         SA_STATE_NORMAL, SA_STATE_ABNORMAL
 111 } sa_state;
 112
 113 #define ccb_pflags      ppriv_field0
 114 #define ccb_bp          ppriv_ptr1
 115
 116 #define SA_CCB_BUFFER_IO        0x0
 117 #define SA_CCB_WAITING          0x1
 118 #define SA_CCB_TYPEMASK         0x1
 119 #define SA_POSITION_UPDATED     0x2
 120
 121 #define Set_CCB_Type(x, type)                           \
 122         x->ccb_h.ccb_pflags &= ~SA_CCB_TYPEMASK;        \
 123         x->ccb_h.ccb_pflags |= type
 124
 125 #define CCB_Type(x)     (x->ccb_h.ccb_pflags & SA_CCB_TYPEMASK)
 126
 127
 128
 129 typedef enum {
 130         SA_FLAG_OPEN            = 0x0001,
 131         SA_FLAG_FIXED           = 0x0002,
 132         SA_FLAG_TAPE_LOCKED     = 0x0004,
 133         SA_FLAG_TAPE_MOUNTED    = 0x0008,
 134         SA_FLAG_TAPE_WP         = 0x0010,
 135         SA_FLAG_TAPE_WRITTEN    = 0x0020,
 136         SA_FLAG_EOM_PENDING     = 0x0040,
 137         SA_FLAG_EIO_PENDING     = 0x0080,
 138         SA_FLAG_EOF_PENDING     = 0x0100,
 139         SA_FLAG_ERR_PENDING     = (SA_FLAG_EOM_PENDING|SA_FLAG_EIO_PENDING|
 140                                    SA_FLAG_EOF_PENDING),
 141         SA_FLAG_INVALID         = 0x0200,
 142         SA_FLAG_COMP_ENABLED    = 0x0400,
 143         SA_FLAG_COMP_SUPP       = 0x0800,
 144         SA_FLAG_COMP_UNSUPP     = 0x1000,
 145         SA_FLAG_TAPE_FROZEN     = 0x2000
 146 } sa_flags;
 147
 148 typedef enum {
 149         SA_MODE_REWIND          = 0x00,
 150         SA_MODE_NOREWIND        = 0x01,
 151         SA_MODE_OFFLINE         = 0x02
 152 } sa_mode;
 153
 154 typedef enum {
 155         SA_PARAM_NONE           = 0x00,
 156         SA_PARAM_BLOCKSIZE      = 0x01,
 157         SA_PARAM_DENSITY        = 0x02,
 158         SA_PARAM_COMPRESSION    = 0x04,
 159         SA_PARAM_BUFF_MODE      = 0x08,
 160         SA_PARAM_NUMBLOCKS      = 0x10,
 161         SA_PARAM_WP             = 0x20,
 162         SA_PARAM_SPEED          = 0x40,
 163         SA_PARAM_ALL            = 0x7f
 164 } sa_params;
 165
 166 typedef enum {
 167         SA_QUIRK_NONE           = 0x00,
 168         SA_QUIRK_NOCOMP         = 0x01, /* Can't deal with compression at all */
 169         SA_QUIRK_FIXED          = 0x02, /* Force fixed mode */
 170         SA_QUIRK_VARIABLE       = 0x04, /* Force variable mode */
 171         SA_QUIRK_2FM            = 0x08, /* Needs Two File Marks at EOD */
 172         SA_QUIRK_1FM            = 0x10, /* No more than 1 File Mark at EOD */
 173         SA_QUIRK_NODREAD        = 0x20, /* Don't try and dummy read density */
 174         SA_QUIRK_NO_MODESEL     = 0x40, /* Don't do mode select at all */
 175         SA_QUIRK_NO_CPAGE       = 0x80  /* Don't use DEVICE COMPRESSION page */
 176 } sa_quirks;
 177
 178 #define SA_QUIRK_BIT_STRING     \
 179         "\020"                  \
 180         "\001NOCOMP"            \
 181         "\002FIXED"             \
 182         "\003VARIABLE"          \
 183         "\0042FM"               \
 184         "\0051FM"               \
 185         "\006NODREAD"           \
 186         "\007NO_MODESEL"        \
 187         "\010NO_CPAGE"
 188
 189 #define SAMODE(z)       (dev2unit(z) & 0x3)
 190 #define SADENSITY(z)    ((dev2unit(z) >> 2) & 0x3)
 191 #define SA_IS_CTRL(z)   (dev2unit(z) & (1 << 4))
 192
 193 #define SA_NOT_CTLDEV   0
 194 #define SA_CTLDEV       1
 195
 196 #define SA_ATYPE_R      0
 197 #define SA_ATYPE_NR     1
 198 #define SA_ATYPE_ER     2
 199
 200 #define SAMINOR(ctl, mode, access) \
 201         ((ctl << 4) | (mode << 2) | (access & 0x3))
 202
 203 #define SA_NUM_MODES    4
 204 struct sa_devs {
 205         struct cdev *ctl_dev;
 206         struct sa_mode_devs {
 207                 struct cdev *r_dev;
 208                 struct cdev *nr_dev;
 209                 struct cdev *er_dev;
 210         } mode_devs[SA_NUM_MODES];
 211 };
 212
 213 struct sa_softc {
 214         sa_state        state;
 215         sa_flags        flags;
 216         sa_quirks       quirks;
 217         u_int           si_flags;
 218         struct          bio_queue_head bio_queue;
 219         int             queue_count;
 220         struct          devstat *device_stats;
 221         struct sa_devs  devs;
 222         int             blk_gran;
 223         int             blk_mask;
 224         int             blk_shift;
 225         u_int32_t       max_blk;
 226         u_int32_t       min_blk;
 227         u_int32_t       maxio;
 228         u_int32_t       cpi_maxio;
 229         int             allow_io_split;
 230         u_int32_t       comp_algorithm;
 231         u_int32_t       saved_comp_algorithm;
 232         u_int32_t       media_blksize;
 233         u_int32_t       last_media_blksize;
 234         u_int32_t       media_numblks;
 235         u_int8_t        media_density;
 236         u_int8_t        speed;
 237         u_int8_t        scsi_rev;
 238         u_int8_t        dsreg;          /* mtio mt_dsreg, redux */
 239         int             buffer_mode;
 240         int             filemarks;
 241         union           ccb saved_ccb;
 242         int             last_resid_was_io;
 243
 244         /*
 245          * Relative to BOT Location.
 246          */
 247         daddr_t         fileno;
 248         daddr_t         blkno;
 249
 250         /*
 251          * Latched Error Info
 252          */
 253         struct {
 254                 struct scsi_sense_data _last_io_sense;
 255                 u_int64_t _last_io_resid;
 256                 u_int8_t _last_io_cdb[CAM_MAX_CDBLEN];
 257                 struct scsi_sense_data _last_ctl_sense;
 258                 u_int64_t _last_ctl_resid;
 259                 u_int8_t _last_ctl_cdb[CAM_MAX_CDBLEN];
 260 #define last_io_sense   errinfo._last_io_sense
 261 #define last_io_resid   errinfo._last_io_resid
 262 #define last_io_cdb     errinfo._last_io_cdb
 263 #define last_ctl_sense  errinfo._last_ctl_sense
 264 #define last_ctl_resid  errinfo._last_ctl_resid
 265 #define last_ctl_cdb    errinfo._last_ctl_cdb
 266         } errinfo;
 267         /*
 268          * Misc other flags/state
 269          */
 270         u_int32_t
 271                                         : 29,
 272                 open_rdonly             : 1,    /* open read-only */
 273                 open_pending_mount      : 1,    /* open pending mount */
 274                 ctrl_mode               : 1;    /* control device open */
 275
 276         struct task             sysctl_task;
 277         struct sysctl_ctx_list  sysctl_ctx;
 278         struct sysctl_oid       *sysctl_tree;
 279 };
 280
 281 struct sa_quirk_entry {
 282         struct scsi_inquiry_pattern inq_pat;    /* matching pattern */
 283         sa_quirks quirks;       /* specific quirk type */
 284         u_int32_t prefblk;      /* preferred blocksize when in fixed mode */
 285 };
 286
 287 static struct sa_quirk_entry sa_quirk_table[] =
 288 {
 289         {
 290                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "OnStream",
 291                   "ADR*", "*"}, SA_QUIRK_FIXED|SA_QUIRK_NODREAD |
 292                    SA_QUIRK_1FM|SA_QUIRK_NO_MODESEL, 32768
 293         },
 294         {
 295                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "ARCHIVE",
 296                   "Python 06408*", "*"}, SA_QUIRK_NODREAD, 0
 297         },
 298         {
 299                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "ARCHIVE",
 300                   "Python 25601*", "*"}, SA_QUIRK_NOCOMP|SA_QUIRK_NODREAD, 0
 301         },
 302         {
 303                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "ARCHIVE",
 304                   "Python*", "*"}, SA_QUIRK_NODREAD, 0
 305         },
 306         {
 307                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "ARCHIVE",
 308                   "VIPER 150*", "*"}, SA_QUIRK_FIXED|SA_QUIRK_1FM, 512
 309         },
 310         {
 311                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "ARCHIVE",
 312                   "VIPER 2525 25462", "-011"},
 313                   SA_QUIRK_NOCOMP|SA_QUIRK_1FM|SA_QUIRK_NODREAD, 0
 314         },
 315         {
 316                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "ARCHIVE",
 317                   "VIPER 2525*", "*"}, SA_QUIRK_FIXED|SA_QUIRK_1FM, 1024
 318         },
 319 #if     0
 320         {
 321                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "HP",
 322                   "C15*", "*"}, SA_QUIRK_VARIABLE|SA_QUIRK_NO_CPAGE, 0,
 323         },
 324 #endif
 325         {
 326                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "HP",
 327                   "C56*", "*"}, SA_QUIRK_VARIABLE|SA_QUIRK_2FM, 0
 328         },
 329         {
 330                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "HP",
 331                   "T20*", "*"}, SA_QUIRK_FIXED|SA_QUIRK_1FM, 512
 332         },
 333         {
 334                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "HP",
 335                   "T4000*", "*"}, SA_QUIRK_FIXED|SA_QUIRK_1FM, 512
 336         },
 337         {
 338                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "HP",
 339                   "HP-88780*", "*"}, SA_QUIRK_VARIABLE|SA_QUIRK_2FM, 0
 340         },
 341         {
 342                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "KENNEDY",
 343                   "*", "*"}, SA_QUIRK_VARIABLE|SA_QUIRK_2FM, 0
 344         },
 345         {
 346                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "M4 DATA",
 347                   "123107 SCSI*", "*"}, SA_QUIRK_VARIABLE|SA_QUIRK_2FM, 0
 348         },
 349         {       /* jreynold@primenet.com */
 350                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "Seagate",
 351                 "STT8000N*", "*"}, SA_QUIRK_1FM, 0
 352         },
 353         {       /* mike@sentex.net */
 354                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "Seagate",
 355                 "STT20000*", "*"}, SA_QUIRK_1FM, 0
 356         },
 357         {
 358                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "SEAGATE",
 359                 "DAT    06241-XXX", "*"}, SA_QUIRK_VARIABLE|SA_QUIRK_2FM, 0
 360         },
 361         {
 362                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "TANDBERG",
 363                   " TDC 3600", "U07:"}, SA_QUIRK_NOCOMP|SA_QUIRK_1FM, 512
 364         },
 365         {
 366                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "TANDBERG",
 367                   " TDC 3800", "*"}, SA_QUIRK_NOCOMP|SA_QUIRK_1FM, 512
 368         },
 369         {
 370                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "TANDBERG",
 371                   " TDC 4100", "*"}, SA_QUIRK_NOCOMP|SA_QUIRK_1FM, 512
 372         },
 373         {
 374                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "TANDBERG",
 375                   " TDC 4200", "*"}, SA_QUIRK_NOCOMP|SA_QUIRK_1FM, 512
 376         },
 377         {
 378                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "TANDBERG",
 379                   " SLR*", "*"}, SA_QUIRK_1FM, 0
 380         },
 381         {
 382                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "WANGTEK",
 383                   "5525ES*", "*"}, SA_QUIRK_FIXED|SA_QUIRK_1FM, 512
 384         },
 385         {
 386                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "WANGTEK",
 387                   "51000*", "*"}, SA_QUIRK_FIXED|SA_QUIRK_1FM, 1024
 388         }
 389 };
 390
 391 static  d_open_t        saopen;
 392 static  d_close_t       saclose;
 393 static  d_strategy_t    sastrategy;
 394 static  d_ioctl_t       saioctl;
 395 static  periph_init_t   sainit;
 396 static  periph_ctor_t   saregister;
 397 static  periph_oninv_t  saoninvalidate;
 398 static  periph_dtor_t   sacleanup;
 399 static  periph_start_t  sastart;
 400 static  void            saasync(void *callback_arg, u_int32_t code,
 401                                 struct cam_path *path, void *arg);
 402 static  void            sadone(struct cam_periph *periph,
 403                                union ccb *start_ccb);
 404 static  int             saerror(union ccb *ccb, u_int32_t cam_flags,
 405                                 u_int32_t sense_flags);
 406 static int              samarkswanted(struct cam_periph *);
 407 static int              sacheckeod(struct cam_periph *periph);
 408 static int              sagetparams(struct cam_periph *periph,
 409                                     sa_params params_to_get,
 410                                     u_int32_t *blocksize, u_int8_t *density,
 411                                     u_int32_t *numblocks, int *buff_mode,
 412                                     u_int8_t *write_protect, u_int8_t *speed,
 413                                     int *comp_supported, int *comp_enabled,
 414                                     u_int32_t *comp_algorithm,
 415                                     sa_comp_t *comp_page);
 416 static int              sasetparams(struct cam_periph *periph,
 417                                     sa_params params_to_set,
 418                                     u_int32_t blocksize, u_int8_t density,
 419                                     u_int32_t comp_algorithm,
 420                                     u_int32_t sense_flags);
 421 static void             saprevent(struct cam_periph *periph, int action);
 422 static int              sarewind(struct cam_periph *periph);
 423 static int              saspace(struct cam_periph *periph, int count,
 424                                 scsi_space_code code);
 425 static int              samount(struct cam_periph *, int, struct cdev *);
 426 static int              saretension(struct cam_periph *periph);
 427 static int              sareservereleaseunit(struct cam_periph *periph,
 428                                              int reserve);
 429 static int              saloadunload(struct cam_periph *periph, int load);
 430 static int              saerase(struct cam_periph *periph, int longerase);
 431 static int              sawritefilemarks(struct cam_periph *periph,
 432                                          int nmarks, int setmarks);
 433 static int              sardpos(struct cam_periph *periph, int, u_int32_t *);
 434 static int              sasetpos(struct cam_periph *periph, int, u_int32_t *);
 435
 436
 437 #ifndef SA_DEFAULT_IO_SPLIT
 438 #define SA_DEFAULT_IO_SPLIT     0
 439 #endif
 440
 441 static int sa_allow_io_split = SA_DEFAULT_IO_SPLIT;
 442
 443 /*
 444  * Tunable to allow the user to set a global allow_io_split value.  Note
 445  * that this WILL GO AWAY in FreeBSD 11.0.  Silently splitting the I/O up
 446  * is bad behavior, because it hides the true tape block size from the
 447  * application.
 448  */
 449 TUNABLE_INT("kern.cam.sa.allow_io_split", &sa_allow_io_split);
 450 static SYSCTL_NODE(_kern_cam, OID_AUTO, sa, CTLFLAG_RD, 0,
 451                   "CAM Sequential Access Tape Driver");
 452
 453 static struct periph_driver sadriver =
 454 {
 455         sainit, "sa",
 456         TAILQ_HEAD_INITIALIZER(sadriver.units), /* generation */ 0
 457 };
 458
 459 PERIPHDRIVER_DECLARE(sa, sadriver);
 460
 461 /* For 2.2-stable support */
 462 #ifndef D_TAPE
 463 #define D_TAPE 0
 464 #endif
 465
 466
 467 static struct cdevsw sa_cdevsw = {
 468         .d_version =    D_VERSION,
 469         .d_open =       saopen,
 470         .d_close =      saclose,
 471         .d_read =       physread,
 472         .d_write =      physwrite,
 473         .d_ioctl =      saioctl,
 474         .d_strategy =   sastrategy,
 475         .d_name =       "sa",
 476         .d_flags =      D_TAPE,
 477 };
 478
 479 static int
 480 saopen(struct cdev *dev, int flags, int fmt, struct thread *td)
 481 {
 482         struct cam_periph *periph;
 483         struct sa_softc *softc;
 484         int error;
 485
 486         periph = (struct cam_periph *)dev->si_drv1;
 487         if (cam_periph_acquire(periph) != CAM_REQ_CMP) {
 488                 return (ENXIO);
 489         }
 490
 491         cam_periph_lock(periph);
 492
 493         softc = (struct sa_softc *)periph->softc;
 494
 495         CAM_DEBUG(periph->path, CAM_DEBUG_TRACE|CAM_DEBUG_INFO,
 496             ("saopen(%s): softc=0x%x\n", devtoname(dev), softc->flags));
 497
 498         if (SA_IS_CTRL(dev)) {
 499                 softc->ctrl_mode = 1;
 500                 cam_periph_unlock(periph);
 501                 return (0);
 502         }
 503
 504         if ((error = cam_periph_hold(periph, PRIBIO|PCATCH)) != 0) {
 505                 cam_periph_unlock(periph);
 506                 cam_periph_release(periph);
 507                 return (error);
 508         }
 509
 510         if (softc->flags & SA_FLAG_OPEN) {
 511                 error = EBUSY;
 512         } else if (softc->flags & SA_FLAG_INVALID) {
 513                 error = ENXIO;
 514         } else {
 515                 /*
 516                  * Preserve whether this is a read_only open.
 517                  */
 518                 softc->open_rdonly = (flags & O_RDWR) == O_RDONLY;
 519
 520                 /*
 521                  * The function samount ensures media is loaded and ready.
 522                  * It also does a device RESERVE if the tape isn't yet mounted.
 523                  *
 524                  * If the mount fails and this was a non-blocking open,
 525                  * make this a 'open_pending_mount' action.
 526                  */
 527                 error = samount(periph, flags, dev);
 528                 if (error && (flags & O_NONBLOCK)) {
 529                         softc->flags |= SA_FLAG_OPEN;
 530                         softc->open_pending_mount = 1;
 531                         cam_periph_unhold(periph);
 532                         cam_periph_unlock(periph);
 533                         return (0);
 534                 }
 535         }
 536
 537         if (error) {
 538                 cam_periph_unhold(periph);
 539                 cam_periph_unlock(periph);
 540                 cam_periph_release(periph);
 541                 return (error);
 542         }
 543
 544         saprevent(periph, PR_PREVENT);
 545         softc->flags |= SA_FLAG_OPEN;
 546
 547         cam_periph_unhold(periph);
 548         cam_periph_unlock(periph);
 549         return (error);
 550 }
 551
 552 static int
 553 saclose(struct cdev *dev, int flag, int fmt, struct thread *td)
 554 {
 555         struct  cam_periph *periph;
 556         struct  sa_softc *softc;
 557         int     mode, error, writing, tmp;
 558         int     closedbits = SA_FLAG_OPEN;
 559
 560         mode = SAMODE(dev);
 561         periph = (struct cam_periph *)dev->si_drv1;
 562         if (periph == NULL)
 563                 return (ENXIO);
 564
 565         cam_periph_lock(periph);
 566
 567         softc = (struct sa_softc *)periph->softc;
 568
 569         CAM_DEBUG(periph->path, CAM_DEBUG_TRACE|CAM_DEBUG_INFO,
 570             ("saclose(%s): softc=0x%x\n", devtoname(dev), softc->flags));
 571
 572
 573         softc->open_rdonly = 0;
 574         if (SA_IS_CTRL(dev)) {
 575                 softc->ctrl_mode = 0;
 576                 cam_periph_unlock(periph);
 577                 cam_periph_release(periph);
 578                 return (0);
 579         }
 580
 581         if (softc->open_pending_mount) {
 582                 softc->flags &= ~SA_FLAG_OPEN;
 583                 softc->open_pending_mount = 0;
 584                 cam_periph_unlock(periph);
 585                 cam_periph_release(periph);
 586                 return (0);
 587         }
 588
 589         if ((error = cam_periph_hold(periph, PRIBIO)) != 0) {
 590                 cam_periph_unlock(periph);
 591                 return (error);
 592         }
 593
 594         /*
 595          * Were we writing the tape?
 596          */
 597         writing = (softc->flags & SA_FLAG_TAPE_WRITTEN) != 0;
 598
 599         /*
 600          * See whether or not we need to write filemarks. If this
 601          * fails, we probably have to assume we've lost tape
 602          * position.
 603          */
 604         error = sacheckeod(periph);
 605         if (error) {
 606                 xpt_print(periph->path,
 607                     "failed to write terminating filemark(s)\n");
 608                 softc->flags |= SA_FLAG_TAPE_FROZEN;
 609         }
 610
 611         /*
 612          * Whatever we end up doing, allow users to eject tapes from here on.
 613          */
 614         saprevent(periph, PR_ALLOW);
 615
 616         /*
 617          * Decide how to end...
 618          */
 619         if ((softc->flags & SA_FLAG_TAPE_MOUNTED) == 0) {
 620                 closedbits |= SA_FLAG_TAPE_FROZEN;
 621         } else switch (mode) {
 622         case SA_MODE_OFFLINE:
 623                 /*
 624                  * An 'offline' close is an unconditional release of
 625                  * frozen && mount conditions, irrespective of whether
 626                  * these operations succeeded. The reason for this is
 627                  * to allow at least some kind of programmatic way
 628                  * around our state getting all fouled up. If somebody
 629                  * issues an 'offline' command, that will be allowed
 630                  * to clear state.
 631                  */
 632                 (void) sarewind(periph);
 633                 (void) saloadunload(periph, FALSE);
 634                 closedbits |= SA_FLAG_TAPE_MOUNTED|SA_FLAG_TAPE_FROZEN;
 635                 break;
 636         case SA_MODE_REWIND:
 637                 /*
 638                  * If the rewind fails, return an error- if anyone cares,
 639                  * but not overwriting any previous error.
 640                  *
 641                  * We don't clear the notion of mounted here, but we do
 642                  * clear the notion of frozen if we successfully rewound.
 643                  */
 644                 tmp = sarewind(periph);
 645                 if (tmp) {
 646                         if (error != 0)
 647                                 error = tmp;
 648                 } else {
 649                         closedbits |= SA_FLAG_TAPE_FROZEN;
 650                 }
 651                 break;
 652         case SA_MODE_NOREWIND:
 653                 /*
 654                  * If we're not rewinding/unloading the tape, find out
 655                  * whether we need to back up over one of two filemarks
 656                  * we wrote (if we wrote two filemarks) so that appends
 657                  * from this point on will be sane.
 658                  */
 659                 if (error == 0 && writing && (softc->quirks & SA_QUIRK_2FM)) {
 660                         tmp = saspace(periph, -1, SS_FILEMARKS);
 661                         if (tmp) {
 662                                 xpt_print(periph->path, "unable to backspace "
 663                                     "over one of double filemarks at end of "
 664                                     "tape\n");
 665                                 xpt_print(periph->path, "it is possible that "
 666                                     "this device needs a SA_QUIRK_1FM quirk set"
 667                                     "for it\n");
 668                                 softc->flags |= SA_FLAG_TAPE_FROZEN;
 669                         }
 670                 }
 671                 break;
 672         default:
 673                 xpt_print(periph->path, "unknown mode 0x%x in saclose\n", mode);
 674                 /* NOTREACHED */
 675                 break;
 676         }
 677
 678         /*
 679          * We wish to note here that there are no more filemarks to be written.
 680          */
 681         softc->filemarks = 0;
 682         softc->flags &= ~SA_FLAG_TAPE_WRITTEN;
 683
 684         /*
 685          * And we are no longer open for business.
 686          */
 687         softc->flags &= ~closedbits;
 688
 689         /*
 690          * Inform users if tape state if frozen....
 691          */
 692         if (softc->flags & SA_FLAG_TAPE_FROZEN) {
 693                 xpt_print(periph->path, "tape is now frozen- use an OFFLINE, "
 694                     "REWIND or MTEOM command to clear this state.\n");
 695         }
 696
 697         /* release the device if it is no longer mounted */
 698         if ((softc->flags & SA_FLAG_TAPE_MOUNTED) == 0)
 699                 sareservereleaseunit(periph, FALSE);
 700
 701         cam_periph_unhold(periph);
 702         cam_periph_unlock(periph);
 703         cam_periph_release(periph);
 704
 705         return (error);
 706 }
 707
 708 /*
 709  * Actually translate the requested transfer into one the physical driver
 710  * can understand.  The transfer is described by a buf and will include
 711  * only one physical transfer.
 712  */
 713 static void
 714 sastrategy(struct bio *bp)
 715 {
 716         struct cam_periph *periph;
 717         struct sa_softc *softc;
 718
 719         bp->bio_resid = bp->bio_bcount;
 720         if (SA_IS_CTRL(bp->bio_dev)) {
 721                 biofinish(bp, NULL, EINVAL);
 722                 return;
 723         }
 724         periph = (struct cam_periph *)bp->bio_dev->si_drv1;
 725         if (periph == NULL) {
 726                 biofinish(bp, NULL, ENXIO);
 727                 return;
 728         }
 729         cam_periph_lock(periph);
 730
 731         softc = (struct sa_softc *)periph->softc;
 732
 733         if (softc->flags & SA_FLAG_INVALID) {
 734                 cam_periph_unlock(periph);
 735                 biofinish(bp, NULL, ENXIO);
 736                 return;
 737         }
 738
 739         if (softc->flags & SA_FLAG_TAPE_FROZEN) {
 740                 cam_periph_unlock(periph);
 741                 biofinish(bp, NULL, EPERM);
 742                 return;
 743         }
 744
 745         /*
 746          * This should actually never occur as the write(2)
 747          * system call traps attempts to write to a read-only
 748          * file descriptor.
 749          */
 750         if (bp->bio_cmd == BIO_WRITE && softc->open_rdonly) {
 751                 cam_periph_unlock(periph);
 752                 biofinish(bp, NULL, EBADF);
 753                 return;
 754         }
 755
 756         if (softc->open_pending_mount) {
 757                 int error = samount(periph, 0, bp->bio_dev);
 758                 if (error) {
 759                         cam_periph_unlock(periph);
 760                         biofinish(bp, NULL, ENXIO);
 761                         return;
 762                 }
 763                 saprevent(periph, PR_PREVENT);
 764                 softc->open_pending_mount = 0;
 765         }
 766
 767
 768         /*
 769          * If it's a null transfer, return immediately
 770          */
 771         if (bp->bio_bcount == 0) {
 772                 cam_periph_unlock(periph);
 773                 biodone(bp);
 774                 return;
 775         }
 776
 777         /* valid request?  */
 778         if (softc->flags & SA_FLAG_FIXED) {
 779                 /*
 780                  * Fixed block device.  The byte count must
 781                  * be a multiple of our block size.
 782                  */
 783                 if (((softc->blk_mask != ~0) &&
 784                     ((bp->bio_bcount & softc->blk_mask) != 0)) ||
 785                     ((softc->blk_mask == ~0) &&
 786                     ((bp->bio_bcount % softc->min_blk) != 0))) {
 787                         xpt_print(periph->path, "Invalid request.  Fixed block "
 788                             "device requests must be a multiple of %d bytes\n",
 789                             softc->min_blk);
 790                         cam_periph_unlock(periph);
 791                         biofinish(bp, NULL, EINVAL);
 792                         return;
 793                 }
 794         } else if ((bp->bio_bcount > softc->max_blk) ||
 795                    (bp->bio_bcount < softc->min_blk) ||
 796                    (bp->bio_bcount & softc->blk_mask) != 0) {
 797
 798                 xpt_print_path(periph->path);
 799                 printf("Invalid request.  Variable block "
 800                     "device requests must be ");
 801                 if (softc->blk_mask != 0) {
 802                         printf("a multiple of %d ", (0x1 << softc->blk_gran));
 803                 }
 804                 printf("between %d and %d bytes\n", softc->min_blk,
 805                     softc->max_blk);
 806                 cam_periph_unlock(periph);
 807                 biofinish(bp, NULL, EINVAL);
 808                 return;
 809         }
 810
 811         /*
 812          * Place it at the end of the queue.
 813          */
 814         bioq_insert_tail(&softc->bio_queue, bp);
 815         softc->queue_count++;
 816 #if     0
 817         CAM_DEBUG(periph->path, CAM_DEBUG_INFO,
 818             ("sastrategy: queuing a %ld %s byte %s\n", bp->bio_bcount,
 819             (softc->flags & SA_FLAG_FIXED)?  "fixed" : "variable",
 820             (bp->bio_cmd == BIO_READ)? "read" : "write"));
 821 #endif
 822         if (softc->queue_count > 1) {
 823                 CAM_DEBUG(periph->path, CAM_DEBUG_INFO,
 824                     ("sastrategy: queue count now %d\n", softc->queue_count));
 825         }
 826
 827         /*
 828          * Schedule ourselves for performing the work.
 829          */
 830         xpt_schedule(periph, CAM_PRIORITY_NORMAL);
 831         cam_periph_unlock(periph);
 832
 833         return;
 834 }
 835
 836
 837 #define PENDING_MOUNT_CHECK(softc, periph, dev)         \
 838         if (softc->open_pending_mount) {                \
 839                 error = samount(periph, 0, dev);        \
 840                 if (error) {                            \
 841                         break;                          \
 842                 }                                       \
 843                 saprevent(periph, PR_PREVENT);          \
 844                 softc->open_pending_mount = 0;          \
 845         }
 846
 847 static int
 848 saioctl(struct cdev *dev, u_long cmd, caddr_t arg, int flag, struct thread *td)
 849 {
 850         struct cam_periph *periph;
 851         struct sa_softc *softc;
 852         scsi_space_code spaceop;
 853         int didlockperiph = 0;
 854         int mode;
 855         int error = 0;
 856
 857         mode = SAMODE(dev);
 858         error = 0;              /* shut up gcc */
 859         spaceop = 0;            /* shut up gcc */
 860
 861         periph = (struct cam_periph *)dev->si_drv1;
 862         if (periph == NULL)
 863                 return (ENXIO);
 864
 865         cam_periph_lock(periph);
 866         softc = (struct sa_softc *)periph->softc;
 867
 868         /*
 869          * Check for control mode accesses. We allow MTIOCGET and
 870          * MTIOCERRSTAT (but need to be the only one open in order
 871          * to clear latched status), and MTSETBSIZE, MTSETDNSTY
 872          * and MTCOMP (but need to be the only one accessing this
 873          * device to run those).
 874          */
 875
 876         if (SA_IS_CTRL(dev)) {
 877                 switch (cmd) {
 878                 case MTIOCGETEOTMODEL:
 879                 case MTIOCGET:
 880                         break;
 881                 case MTIOCERRSTAT:
 882                         /*
 883                          * If the periph isn't already locked, lock it
 884                          * so our MTIOCERRSTAT can reset latched error stats.
 885                          *
 886                          * If the periph is already locked, skip it because
 887                          * we're just getting status and it'll be up to the
 888                          * other thread that has this device open to do
 889                          * an MTIOCERRSTAT that would clear latched status.
 890                          */
 891                         if ((periph->flags & CAM_PERIPH_LOCKED) == 0) {
 892                                 error = cam_periph_hold(periph, PRIBIO|PCATCH);
 893                                 if (error != 0) {
 894                                         cam_periph_unlock(periph);
 895                                         return (error);
 896                                 }
 897                                 didlockperiph = 1;
 898                         }
 899                         break;
 900
 901                 case MTIOCTOP:
 902                 {
 903                         struct mtop *mt = (struct mtop *) arg;
 904
 905                         /*
 906                          * Check to make sure it's an OP we can perform
 907                          * with no media inserted.
 908                          */
 909                         switch (mt->mt_op) {
 910                         case MTSETBSIZ:
 911                         case MTSETDNSTY:
 912                         case MTCOMP:
 913                                 mt = NULL;
 914                                 /* FALLTHROUGH */
 915                         default:
 916                                 break;
 917                         }
 918                         if (mt != NULL) {
 919                                 break;
 920                         }
 921                         /* FALLTHROUGH */
 922                 }
 923                 case MTIOCSETEOTMODEL:
 924                         /*
 925                          * We need to acquire the peripheral here rather
 926                          * than at open time because we are sharing writable
 927                          * access to data structures.
 928                          */
 929                         error = cam_periph_hold(periph, PRIBIO|PCATCH);
 930                         if (error != 0) {
 931                                 cam_periph_unlock(periph);
 932                                 return (error);
 933                         }
 934                         didlockperiph = 1;
 935                         break;
 936
 937                 default:
 938                         cam_periph_unlock(periph);
 939                         return (EINVAL);
 940                 }
 941         }
 942
 943         /*
 944          * Find the device that the user is talking about
 945          */
 946         switch (cmd) {
 947         case MTIOCGET:
 948         {
 949                 struct mtget *g = (struct mtget *)arg;
 950
 951                 /*
 952                  * If this isn't the control mode device, actually go out
 953                  * and ask the drive again what it's set to.
 954                  */
 955                 if (!SA_IS_CTRL(dev) && !softc->open_pending_mount) {
 956                         u_int8_t write_protect;
 957                         int comp_enabled, comp_supported;
 958                         error = sagetparams(periph, SA_PARAM_ALL,
 959                             &softc->media_blksize, &softc->media_density,
 960                             &softc->media_numblks, &softc->buffer_mode,
 961                             &write_protect, &softc->speed, &comp_supported,
 962                             &comp_enabled, &softc->comp_algorithm, NULL);
 963                         if (error)
 964                                 break;
 965                         if (write_protect)
 966                                 softc->flags |= SA_FLAG_TAPE_WP;
 967                         else
 968                                 softc->flags &= ~SA_FLAG_TAPE_WP;
 969                         softc->flags &= ~(SA_FLAG_COMP_SUPP|
 970                             SA_FLAG_COMP_ENABLED|SA_FLAG_COMP_UNSUPP);
 971                         if (comp_supported) {
 972                                 if (softc->saved_comp_algorithm == 0)
 973                                         softc->saved_comp_algorithm =
 974                                             softc->comp_algorithm;
 975                                 softc->flags |= SA_FLAG_COMP_SUPP;
 976                                 if (comp_enabled)
 977                                         softc->flags |= SA_FLAG_COMP_ENABLED;
 978                         } else
 979                                 softc->flags |= SA_FLAG_COMP_UNSUPP;
 980                 }
 981                 bzero(g, sizeof(struct mtget));
 982                 g->mt_type = MT_ISAR;
 983                 if (softc->flags & SA_FLAG_COMP_UNSUPP) {
 984                         g->mt_comp = MT_COMP_UNSUPP;
 985                         g->mt_comp0 = MT_COMP_UNSUPP;
 986                         g->mt_comp1 = MT_COMP_UNSUPP;
 987                         g->mt_comp2 = MT_COMP_UNSUPP;
 988                         g->mt_comp3 = MT_COMP_UNSUPP;
 989                 } else {
 990                         if ((softc->flags & SA_FLAG_COMP_ENABLED) == 0) {
 991                                 g->mt_comp = MT_COMP_DISABLED;
 992                         } else {
 993                                 g->mt_comp = softc->comp_algorithm;
 994                         }
 995                         g->mt_comp0 = softc->comp_algorithm;
 996                         g->mt_comp1 = softc->comp_algorithm;
 997                         g->mt_comp2 = softc->comp_algorithm;
 998                         g->mt_comp3 = softc->comp_algorithm;
 999                 }
1000                 g->mt_density = softc->media_density;
1001                 g->mt_density0 = softc->media_density;
1002                 g->mt_density1 = softc->media_density;
1003                 g->mt_density2 = softc->media_density;
1004                 g->mt_density3 = softc->media_density;
1005                 g->mt_blksiz = softc->media_blksize;
1006                 g->mt_blksiz0 = softc->media_blksize;
1007                 g->mt_blksiz1 = softc->media_blksize;
1008                 g->mt_blksiz2 = softc->media_blksize;
1009                 g->mt_blksiz3 = softc->media_blksize;
1010                 g->mt_fileno = softc->fileno;
1011                 g->mt_blkno = softc->blkno;
1012                 g->mt_dsreg = (short) softc->dsreg;
1013                 /*
1014                  * Yes, we know that this is likely to overflow
1015                  */
1016                 if (softc->last_resid_was_io) {
1017                         if ((g->mt_resid = (short) softc->last_io_resid) != 0) {
1018                                 if (SA_IS_CTRL(dev) == 0 || didlockperiph) {
1019                                         softc->last_io_resid = 0;
1020                                 }
1021                         }
1022                 } else {
1023                         if ((g->mt_resid = (short)softc->last_ctl_resid) != 0) {
1024                                 if (SA_IS_CTRL(dev) == 0 || didlockperiph) {
1025                                         softc->last_ctl_resid = 0;
1026                                 }
1027                         }
1028                 }
1029                 error = 0;
1030                 break;
1031         }
1032         case MTIOCERRSTAT:
1033         {
1034                 struct scsi_tape_errors *sep =
1035                     &((union mterrstat *)arg)->scsi_errstat;
1036
1037                 CAM_DEBUG(periph->path, CAM_DEBUG_TRACE,
1038                     ("saioctl: MTIOCERRSTAT\n"));
1039
1040                 bzero(sep, sizeof(*sep));
1041                 sep->io_resid = softc->last_io_resid;
1042                 bcopy((caddr_t) &softc->last_io_sense, sep->io_sense,
1043                     sizeof (sep->io_sense));
1044                 bcopy((caddr_t) &softc->last_io_cdb, sep->io_cdb,
1045                     sizeof (sep->io_cdb));
1046                 sep->ctl_resid = softc->last_ctl_resid;
1047                 bcopy((caddr_t) &softc->last_ctl_sense, sep->ctl_sense,
1048                     sizeof (sep->ctl_sense));
1049                 bcopy((caddr_t) &softc->last_ctl_cdb, sep->ctl_cdb,
1050                     sizeof (sep->ctl_cdb));
1051
1052                 if ((SA_IS_CTRL(dev) == 0 && softc->open_pending_mount) ||
1053                     didlockperiph)
1054                         bzero((caddr_t) &softc->errinfo,
1055                             sizeof (softc->errinfo));
1056                 error = 0;
1057                 break;
1058         }
1059         case MTIOCTOP:
1060         {
1061                 struct mtop *mt;
1062                 int    count;
1063
1064                 PENDING_MOUNT_CHECK(softc, periph, dev);
1065
1066                 mt = (struct mtop *)arg;
1067
1068
1069                 CAM_DEBUG(periph->path, CAM_DEBUG_TRACE,
1070                          ("saioctl: op=0x%x count=0x%x\n",
1071                           mt->mt_op, mt->mt_count));
1072
1073                 count = mt->mt_count;
1074                 switch (mt->mt_op) {
1075                 case MTWEOF:    /* write an end-of-file marker */
1076                         /*
1077                          * We don't need to clear the SA_FLAG_TAPE_WRITTEN
1078                          * flag because by keeping track of filemarks
1079                          * we have last written we know ehether or not
1080                          * we need to write more when we close the device.
1081                          */
1082                         error = sawritefilemarks(periph, count, FALSE);
1083                         break;
1084                 case MTWSS:     /* write a setmark */
1085                         error = sawritefilemarks(periph, count, TRUE);
1086                         break;
1087                 case MTBSR:     /* backward space record */
1088                 case MTFSR:     /* forward space record */
1089                 case MTBSF:     /* backward space file */
1090                 case MTFSF:     /* forward space file */
1091                 case MTBSS:     /* backward space setmark */
1092                 case MTFSS:     /* forward space setmark */
1093                 case MTEOD:     /* space to end of recorded medium */
1094                 {
1095                         int nmarks;
1096
1097                         spaceop = SS_FILEMARKS;
1098                         nmarks = softc->filemarks;
1099                         error = sacheckeod(periph);
1100                         if (error) {
1101                                 xpt_print(periph->path,
1102                                     "EOD check prior to spacing failed\n");
1103                                 softc->flags |= SA_FLAG_EIO_PENDING;
1104                                 break;
1105                         }
1106                         nmarks -= softc->filemarks;
1107                         switch(mt->mt_op) {
1108                         case MTBSR:
1109                                 count = -count;
1110                                 /* FALLTHROUGH */
1111                         case MTFSR:
1112                                 spaceop = SS_BLOCKS;
1113                                 break;
1114                         case MTBSF:
1115                                 count = -count;
1116                                 /* FALLTHROUGH */
1117                         case MTFSF:
1118                                 break;
1119                         case MTBSS:
1120                                 count = -count;
1121                                 /* FALLTHROUGH */
1122                         case MTFSS:
1123                                 spaceop = SS_SETMARKS;
1124                                 break;
1125                         case MTEOD:
1126                                 spaceop = SS_EOD;
1127                                 count = 0;
1128                                 nmarks = 0;
1129                                 break;
1130                         default:
1131                                 error = EINVAL;
1132                                 break;
1133                         }
1134                         if (error)
1135                                 break;
1136
1137                         nmarks = softc->filemarks;
1138                         /*
1139                          * XXX: Why are we checking again?
1140                          */
1141                         error = sacheckeod(periph);
1142                         if (error)
1143                                 break;
1144                         nmarks -= softc->filemarks;
1145                         error = saspace(periph, count - nmarks, spaceop);
1146                         /*
1147                          * At this point, clear that we've written the tape
1148                          * and that we've written any filemarks. We really
1149                          * don't know what the applications wishes to do next-
1150                          * the sacheckeod's will make sure we terminated the
1151                          * tape correctly if we'd been writing, but the next
1152                          * action the user application takes will set again
1153                          * whether we need to write filemarks.
1154                          */
1155                         softc->flags &=
1156                             ~(SA_FLAG_TAPE_WRITTEN|SA_FLAG_TAPE_FROZEN);
1157                         softc->filemarks = 0;
1158                         break;
1159                 }
1160                 case MTREW:     /* rewind */
1161                         PENDING_MOUNT_CHECK(softc, periph, dev);
1162                         (void) sacheckeod(periph);
1163                         error = sarewind(periph);
1164                         /* see above */
1165                         softc->flags &=
1166                             ~(SA_FLAG_TAPE_WRITTEN|SA_FLAG_TAPE_FROZEN);
1167                         softc->flags &= ~SA_FLAG_ERR_PENDING;
1168                         softc->filemarks = 0;
1169                         break;
1170                 case MTERASE:   /* erase */
1171                         PENDING_MOUNT_CHECK(softc, periph, dev);
1172                         error = saerase(periph, count);
1173                         softc->flags &=
1174                             ~(SA_FLAG_TAPE_WRITTEN|SA_FLAG_TAPE_FROZEN);
1175                         softc->flags &= ~SA_FLAG_ERR_PENDING;
1176                         break;
1177                 case MTRETENS:  /* re-tension tape */
1178                         PENDING_MOUNT_CHECK(softc, periph, dev);
1179                         error = saretension(periph);
1180                         softc->flags &=
1181                             ~(SA_FLAG_TAPE_WRITTEN|SA_FLAG_TAPE_FROZEN);
1182                         softc->flags &= ~SA_FLAG_ERR_PENDING;
1183                         break;
1184                 case MTOFFL:    /* rewind and put the drive offline */
1185
1186                         PENDING_MOUNT_CHECK(softc, periph, dev);
1187
1188                         (void) sacheckeod(periph);
1189                         /* see above */
1190                         softc->flags &= ~SA_FLAG_TAPE_WRITTEN;
1191                         softc->filemarks = 0;
1192
1193                         error = sarewind(periph);
1194                         /* clear the frozen flag anyway */
1195                         softc->flags &= ~SA_FLAG_TAPE_FROZEN;
1196
1197                         /*
1198                          * Be sure to allow media removal before ejecting.
1199                          */
1200
1201                         saprevent(periph, PR_ALLOW);
1202                         if (error == 0) {
1203                                 error = saloadunload(periph, FALSE);
1204                                 if (error == 0) {
1205                                         softc->flags &= ~SA_FLAG_TAPE_MOUNTED;
1206                                 }
1207                         }
1208                         break;
1209
1210                 case MTNOP:     /* no operation, sets status only */
1211                 case MTCACHE:   /* enable controller cache */
1212                 case MTNOCACHE: /* disable controller cache */
1213                         error = 0;
1214                         break;
1215
1216                 case MTSETBSIZ: /* Set block size for device */
1217
1218                         PENDING_MOUNT_CHECK(softc, periph, dev);
1219
1220                         error = sasetparams(periph, SA_PARAM_BLOCKSIZE, count,
1221                                             0, 0, 0);
1222                         if (error == 0) {
1223                                 softc->last_media_blksize =
1224                                     softc->media_blksize;
1225                                 softc->media_blksize = count;
1226                                 if (count) {
1227                                         softc->flags |= SA_FLAG_FIXED;
1228                                         if (powerof2(count)) {
1229                                                 softc->blk_shift =
1230                                                     ffs(count) - 1;
1231                                                 softc->blk_mask = count - 1;
1232                                         } else {
1233                                                 softc->blk_mask = ~0;
1234                                                 softc->blk_shift = 0;
1235                                         }
1236                                         /*
1237                                          * Make the user's desire 'persistent'.
1238                                          */
1239                                         softc->quirks &= ~SA_QUIRK_VARIABLE;
1240                                         softc->quirks |= SA_QUIRK_FIXED;
1241                                 } else {
1242                                         softc->flags &= ~SA_FLAG_FIXED;
1243                                         if (softc->max_blk == 0) {
1244                                                 softc->max_blk = ~0;
1245                                         }
1246                                         softc->blk_shift = 0;
1247                                         if (softc->blk_gran != 0) {
1248                                                 softc->blk_mask =
1249                                                     softc->blk_gran - 1;
1250                                         } else {
1251                                                 softc->blk_mask = 0;
1252                                         }
1253                                         /*
1254                                          * Make the user's desire 'persistent'.
1255                                          */
1256                                         softc->quirks |= SA_QUIRK_VARIABLE;
1257                                         softc->quirks &= ~SA_QUIRK_FIXED;
1258                                 }
1259                         }
1260                         break;
1261                 case MTSETDNSTY:        /* Set density for device and mode */
1262                         PENDING_MOUNT_CHECK(softc, periph, dev);
1263
1264                         if (count > UCHAR_MAX) {
1265                                 error = EINVAL;
1266                                 break;
1267                         } else {
1268                                 error = sasetparams(periph, SA_PARAM_DENSITY,
1269                                                     0, count, 0, 0);
1270                         }
1271                         break;
1272                 case MTCOMP:    /* enable compression */
1273                         PENDING_MOUNT_CHECK(softc, periph, dev);
1274                         /*
1275                          * Some devices don't support compression, and
1276                          * don't like it if you ask them for the
1277                          * compression page.
1278                          */
1279                         if ((softc->quirks & SA_QUIRK_NOCOMP) ||
1280                             (softc->flags & SA_FLAG_COMP_UNSUPP)) {
1281                                 error = ENODEV;
1282                                 break;
1283                         }
1284                         error = sasetparams(periph, SA_PARAM_COMPRESSION,
1285                             0, 0, count, SF_NO_PRINT);
1286                         break;
1287                 default:
1288                         error = EINVAL;
1289                 }
1290                 break;
1291         }
1292         case MTIOCIEOT:
1293         case MTIOCEEOT:
1294                 error = 0;
1295                 break;
1296         case MTIOCRDSPOS:
1297                 PENDING_MOUNT_CHECK(softc, periph, dev);
1298                 error = sardpos(periph, 0, (u_int32_t *) arg);
1299                 break;
1300         case MTIOCRDHPOS:
1301                 PENDING_MOUNT_CHECK(softc, periph, dev);
1302                 error = sardpos(periph, 1, (u_int32_t *) arg);
1303                 break;
1304         case MTIOCSLOCATE:
1305                 PENDING_MOUNT_CHECK(softc, periph, dev);
1306                 error = sasetpos(periph, 0, (u_int32_t *) arg);
1307                 break;
1308         case MTIOCHLOCATE:
1309                 PENDING_MOUNT_CHECK(softc, periph, dev);
1310                 error = sasetpos(periph, 1, (u_int32_t *) arg);
1311                 break;
1312         case MTIOCGETEOTMODEL:
1313                 error = 0;
1314                 if (softc->quirks & SA_QUIRK_1FM)
1315                         mode = 1;
1316                 else
1317                         mode = 2;
1318                 *((u_int32_t *) arg) = mode;
1319                 break;
1320         case MTIOCSETEOTMODEL:
1321                 error = 0;
1322                 switch (*((u_int32_t *) arg)) {
1323                 case 1:
1324                         softc->quirks &= ~SA_QUIRK_2FM;
1325                         softc->quirks |= SA_QUIRK_1FM;
1326                         break;
1327                 case 2:
1328                         softc->quirks &= ~SA_QUIRK_1FM;
1329                         softc->quirks |= SA_QUIRK_2FM;
1330                         break;
1331                 default:
1332                         error = EINVAL;
1333                         break;
1334                 }
1335                 break;
1336         default:
1337                 error = cam_periph_ioctl(periph, cmd, arg, saerror);
1338                 break;
1339         }
1340
1341         /*
1342          * Check to see if we cleared a frozen state
1343          */
1344         if (error == 0 && (softc->flags & SA_FLAG_TAPE_FROZEN)) {
1345                 switch(cmd) {
1346                 case MTIOCRDSPOS:
1347                 case MTIOCRDHPOS:
1348                 case MTIOCSLOCATE:
1349                 case MTIOCHLOCATE:
1350                         softc->fileno = (daddr_t) -1;
1351                         softc->blkno = (daddr_t) -1;
1352                         softc->flags &= ~SA_FLAG_TAPE_FROZEN;
1353                         xpt_print(periph->path,
1354                             "tape state now unfrozen.\n");
1355                         break;
1356                 default:
1357                         break;
1358                 }
1359         }
1360         if (didlockperiph) {
1361                 cam_periph_unhold(periph);
1362         }
1363         cam_periph_unlock(periph);
1364         return (error);
1365 }
1366
1367 static void
1368 sainit(void)
1369 {
1370         cam_status status;
1371
1372         /*
1373          * Install a global async callback.
1374          */
1375         status = xpt_register_async(AC_FOUND_DEVICE, saasync, NULL, NULL);
1376
1377         if (status != CAM_REQ_CMP) {
1378                 printf("sa: Failed to attach master async callback "
1379                        "due to status 0x%x!\n", status);
1380         }
1381 }
1382
1383 static void
1384 saoninvalidate(struct cam_periph *periph)
1385 {
1386         struct sa_softc *softc;
1387
1388         softc = (struct sa_softc *)periph->softc;
1389
1390         /*
1391          * De-register any async callbacks.
1392          */
1393         xpt_register_async(0, saasync, periph, periph->path);
1394
1395         softc->flags |= SA_FLAG_INVALID;
1396
1397         /*
1398          * Return all queued I/O with ENXIO.
1399          * XXX Handle any transactions queued to the card
1400          *     with XPT_ABORT_CCB.
1401          */
1402         bioq_flush(&softc->bio_queue, NULL, ENXIO);
1403         softc->queue_count = 0;
1404
1405         xpt_print(periph->path, "lost device\n");
1406
1407 }
1408
1409 static void
1410 sacleanup(struct cam_periph *periph)
1411 {
1412         struct sa_softc *softc;
1413         int i;
1414
1415         softc = (struct sa_softc *)periph->softc;
1416
1417         xpt_print(periph->path, "removing device entry\n");
1418         devstat_remove_entry(softc->device_stats);
1419         cam_periph_unlock(periph);
1420         destroy_dev(softc->devs.ctl_dev);
1421         for (i = 0; i < SA_NUM_MODES; i++) {
1422                 destroy_dev(softc->devs.mode_devs[i].r_dev);
1423                 destroy_dev(softc->devs.mode_devs[i].nr_dev);
1424                 destroy_dev(softc->devs.mode_devs[i].er_dev);
1425         }
1426         cam_periph_lock(periph);
1427         free(softc, M_SCSISA);
1428 }
1429
1430 static void
1431 saasync(void *callback_arg, u_int32_t code,
1432         struct cam_path *path, void *arg)
1433 {
1434         struct cam_periph *periph;
1435
1436         periph = (struct cam_periph *)callback_arg;
1437         switch (code) {
1438         case AC_FOUND_DEVICE:
1439         {
1440                 struct ccb_getdev *cgd;
1441                 cam_status status;
1442
1443                 cgd = (struct ccb_getdev *)arg;
1444                 if (cgd == NULL)
1445                         break;
1446
1447                 if (cgd->protocol != PROTO_SCSI)
1448                         break;
1449
1450                 if (SID_TYPE(&cgd->inq_data) != T_SEQUENTIAL)
1451                         break;
1452
1453                 /*
1454                  * Allocate a peripheral instance for
1455                  * this device and start the probe
1456                  * process.
1457                  */
1458                 status = cam_periph_alloc(saregister, saoninvalidate,
1459                                           sacleanup, sastart,
1460                                           "sa", CAM_PERIPH_BIO, cgd->ccb_h.path,
1461                                           saasync, AC_FOUND_DEVICE, cgd);
1462
1463                 if (status != CAM_REQ_CMP
1464                  && status != CAM_REQ_INPROG)
1465                         printf("saasync: Unable to probe new device "
1466                                 "due to status 0x%x\n", status);
1467                 break;
1468         }
1469         default:
1470                 cam_periph_async(periph, code, path, arg);
1471                 break;
1472         }
1473 }
1474
1475 static void
1476 sasysctlinit(void *context, int pending)
1477 {
1478         struct cam_periph *periph;
1479         struct sa_softc *softc;
1480         char tmpstr[80], tmpstr2[80];
1481
1482         periph = (struct cam_periph *)context;
1483         /*
1484          * If the periph is invalid, no need to setup the sysctls.
1485          */
1486         if (periph->flags & CAM_PERIPH_INVALID)
1487                 goto bailout;
1488
1489         softc = (struct sa_softc *)periph->softc;
1490
1491         snprintf(tmpstr, sizeof(tmpstr), "CAM SA unit %d", periph->unit_number);
1492         snprintf(tmpstr2, sizeof(tmpstr2), "%u", periph->unit_number);
1493
1494         sysctl_ctx_init(&softc->sysctl_ctx);
1495         softc->sysctl_tree = SYSCTL_ADD_NODE(&softc->sysctl_ctx,
1496             SYSCTL_STATIC_CHILDREN(_kern_cam_sa), OID_AUTO, tmpstr2,
1497                     CTLFLAG_RD, 0, tmpstr);
1498         if (softc->sysctl_tree == NULL)
1499                 goto bailout;
1500
1501         SYSCTL_ADD_INT(&softc->sysctl_ctx, SYSCTL_CHILDREN(softc->sysctl_tree),
1502             OID_AUTO, "allow_io_split", CTLTYPE_INT | CTLFLAG_RDTUN,
1503             &softc->allow_io_split, 0, "Allow Splitting I/O");
1504         SYSCTL_ADD_INT(&softc->sysctl_ctx, SYSCTL_CHILDREN(softc->sysctl_tree),
1505             OID_AUTO, "maxio", CTLTYPE_INT | CTLFLAG_RD,
1506             &softc->maxio, 0, "Maximum I/O size");
1507         SYSCTL_ADD_INT(&softc->sysctl_ctx, SYSCTL_CHILDREN(softc->sysctl_tree),
1508             OID_AUTO, "cpi_maxio", CTLTYPE_INT | CTLFLAG_RD,
1509             &softc->cpi_maxio, 0, "Maximum Controller I/O size");
1510
1511 bailout:
1512         /*
1513          * Release the reference that was held when this task was enqueued.
1514          */
1515         cam_periph_release(periph);
1516 }
1517
1518 static cam_status
1519 saregister(struct cam_periph *periph, void *arg)
1520 {
1521         struct sa_softc *softc;
1522         struct ccb_getdev *cgd;
1523         struct ccb_pathinq cpi;
1524         caddr_t match;
1525         char tmpstr[80];
1526         int i;
1527
1528         cgd = (struct ccb_getdev *)arg;
1529         if (cgd == NULL) {
1530                 printf("saregister: no getdev CCB, can't register device\n");
1531                 return (CAM_REQ_CMP_ERR);
1532         }
1533
1534         softc = (struct sa_softc *)
1535             malloc(sizeof (*softc), M_SCSISA, M_NOWAIT | M_ZERO);
1536         if (softc == NULL) {
1537                 printf("saregister: Unable to probe new device. "
1538                        "Unable to allocate softc\n");
1539                 return (CAM_REQ_CMP_ERR);
1540         }
1541         softc->scsi_rev = SID_ANSI_REV(&cgd->inq_data);
1542         softc->state = SA_STATE_NORMAL;
1543         softc->fileno = (daddr_t) -1;
1544         softc->blkno = (daddr_t) -1;
1545
1546         bioq_init(&softc->bio_queue);
1547         periph->softc = softc;
1548
1549         /*
1550          * See if this device has any quirks.
1551          */
1552         match = cam_quirkmatch((caddr_t)&cgd->inq_data,
1553                                (caddr_t)sa_quirk_table,
1554                                sizeof(sa_quirk_table)/sizeof(*sa_quirk_table),
1555                                sizeof(*sa_quirk_table), scsi_inquiry_match);
1556
1557         if (match != NULL) {
1558                 softc->quirks = ((struct sa_quirk_entry *)match)->quirks;
1559                 softc->last_media_blksize =
1560                     ((struct sa_quirk_entry *)match)->prefblk;
1561         } else
1562                 softc->quirks = SA_QUIRK_NONE;
1563
1564         bzero(&cpi, sizeof(cpi));
1565         xpt_setup_ccb(&cpi.ccb_h, periph->path, CAM_PRIORITY_NORMAL);
1566         cpi.ccb_h.func_code = XPT_PATH_INQ;
1567         xpt_action((union ccb *)&cpi);
1568
1569         /*
1570          * The SA driver supports a blocksize, but we don't know the
1571          * blocksize until we media is inserted.  So, set a flag to
1572          * indicate that the blocksize is unavailable right now.
1573          */
1574         cam_periph_unlock(periph);
1575         softc->device_stats = devstat_new_entry("sa", periph->unit_number, 0,
1576             DEVSTAT_BS_UNAVAILABLE, SID_TYPE(&cgd->inq_data) |
1577             XPORT_DEVSTAT_TYPE(cpi.transport), DEVSTAT_PRIORITY_TAPE);
1578
1579         /*
1580          * Load the default value that is either compiled in, or loaded
1581          * in the global kern.cam.sa.allow_io_split tunable.
1582          */
1583         softc->allow_io_split = sa_allow_io_split;
1584
1585         /*
1586          * Load a per-instance tunable, if it exists.  NOTE that this
1587          * tunable WILL GO AWAY in FreeBSD 11.0.
1588          */
1589         snprintf(tmpstr, sizeof(tmpstr), "kern.cam.sa.%u.allow_io_split",
1590                  periph->unit_number);
1591         TUNABLE_INT_FETCH(tmpstr, &softc->allow_io_split);
1592
1593         /*
1594          * If maxio isn't set, we fall back to DFLTPHYS.  Otherwise we take
1595          * the smaller of cpi.maxio or MAXPHYS.
1596          */
1597         if (cpi.maxio == 0)
1598                 softc->maxio = DFLTPHYS;
1599         else if (cpi.maxio > MAXPHYS)
1600                 softc->maxio = MAXPHYS;
1601         else
1602                 softc->maxio = cpi.maxio;
1603
1604         /*
1605          * Record the controller's maximum I/O size so we can report it to
1606          * the user later.
1607          */
1608         softc->cpi_maxio = cpi.maxio;
1609
1610         /*
1611          * By default we tell physio that we do not want our I/O split.
1612          * The user needs to have a 1:1 mapping between the size of his
1613          * write to a tape character device and the size of the write
1614          * that actually goes down to the drive.
1615          */
1616         if (softc->allow_io_split == 0)
1617                 softc->si_flags = SI_NOSPLIT;
1618         else
1619                 softc->si_flags = 0;
1620
1621         TASK_INIT(&softc->sysctl_task, 0, sasysctlinit, periph);
1622
1623         /*
1624          * If the SIM supports unmapped I/O, let physio know that we can
1625          * handle unmapped buffers.
1626          */
1627         if (cpi.hba_misc & PIM_UNMAPPED)
1628                 softc->si_flags |= SI_UNMAPPED;
1629
1630         softc->devs.ctl_dev = make_dev(&sa_cdevsw, SAMINOR(SA_CTLDEV,
1631             0, SA_ATYPE_R), UID_ROOT, GID_OPERATOR,
1632             0660, "%s%d.ctl", periph->periph_name, periph->unit_number);
1633         softc->devs.ctl_dev->si_drv1 = periph;
1634         softc->devs.ctl_dev->si_iosize_max = softc->maxio;
1635         softc->devs.ctl_dev->si_flags |= softc->si_flags;
1636
1637         for (i = 0; i < SA_NUM_MODES; i++) {
1638
1639                 softc->devs.mode_devs[i].r_dev = make_dev(&sa_cdevsw,
1640                     SAMINOR(SA_NOT_CTLDEV, i, SA_ATYPE_R),
1641                     UID_ROOT, GID_OPERATOR, 0660, "%s%d.%d",
1642                     periph->periph_name, periph->unit_number, i);
1643                 softc->devs.mode_devs[i].r_dev->si_drv1 = periph;
1644                 softc->devs.mode_devs[i].r_dev->si_iosize_max = softc->maxio;
1645                 softc->devs.mode_devs[i].r_dev->si_flags |= softc->si_flags;
1646
1647                 softc->devs.mode_devs[i].nr_dev = make_dev(&sa_cdevsw,
1648                     SAMINOR(SA_NOT_CTLDEV, i, SA_ATYPE_NR),
1649                     UID_ROOT, GID_OPERATOR, 0660, "n%s%d.%d",
1650                     periph->periph_name, periph->unit_number, i);
1651                 softc->devs.mode_devs[i].nr_dev->si_drv1 = periph;
1652                 softc->devs.mode_devs[i].nr_dev->si_iosize_max = softc->maxio;
1653                 softc->devs.mode_devs[i].nr_dev->si_flags |= softc->si_flags;
1654
1655                 softc->devs.mode_devs[i].er_dev = make_dev(&sa_cdevsw,
1656                     SAMINOR(SA_NOT_CTLDEV, i, SA_ATYPE_ER),
1657                     UID_ROOT, GID_OPERATOR, 0660, "e%s%d.%d",
1658                     periph->periph_name, periph->unit_number, i);
1659                 softc->devs.mode_devs[i].er_dev->si_drv1 = periph;
1660                 softc->devs.mode_devs[i].er_dev->si_iosize_max = softc->maxio;
1661                 softc->devs.mode_devs[i].er_dev->si_flags |= softc->si_flags;
1662
1663                 /*
1664                  * Make the (well known) aliases for the first mode.
1665                  */
1666                 if (i == 0) {
1667                         struct cdev *alias;
1668
1669                         alias = make_dev_alias(softc->devs.mode_devs[i].r_dev,
1670                            "%s%d", periph->periph_name, periph->unit_number);
1671                         alias->si_drv1 = periph;
1672                         alias->si_iosize_max = softc->maxio;
1673                         alias->si_flags |= softc->si_flags;
1674
1675                         alias = make_dev_alias(softc->devs.mode_devs[i].nr_dev,
1676                             "n%s%d", periph->periph_name, periph->unit_number);
1677                         alias->si_drv1 = periph;
1678                         alias->si_iosize_max = softc->maxio;
1679                         alias->si_flags |= softc->si_flags;
1680
1681                         alias = make_dev_alias(softc->devs.mode_devs[i].er_dev,
1682                             "e%s%d", periph->periph_name, periph->unit_number);
1683                         alias->si_drv1 = periph;
1684                         alias->si_iosize_max = softc->maxio;
1685                         alias->si_flags |= softc->si_flags;
1686                 }
1687         }
1688         cam_periph_lock(periph);
1689
1690         /*
1691          * Bump the peripheral refcount for the sysctl thread, in case we
1692          * get invalidated before the thread has a chance to run.
1693          */
1694         cam_periph_acquire(periph);
1695         taskqueue_enqueue(taskqueue_thread, &softc->sysctl_task);
1696
1697         /*
1698          * Add an async callback so that we get
1699          * notified if this device goes away.
1700          */
1701         xpt_register_async(AC_LOST_DEVICE, saasync, periph, periph->path);
1702
1703         xpt_announce_periph(periph, NULL);
1704         xpt_announce_quirks(periph, softc->quirks, SA_QUIRK_BIT_STRING);
1705
1706         return (CAM_REQ_CMP);
1707 }
1708
1709 static void
1710 sastart(struct cam_periph *periph, union ccb *start_ccb)
1711 {
1712         struct sa_softc *softc;
1713
1714         softc = (struct sa_softc *)periph->softc;
1715
1716         CAM_DEBUG(periph->path, CAM_DEBUG_TRACE, ("sastart\n"));
1717
1718
1719         switch (softc->state) {
1720         case SA_STATE_NORMAL:
1721         {
1722                 /* Pull a buffer from the queue and get going on it */
1723                 struct bio *bp;
1724
1725                 /*
1726                  * See if there is a buf with work for us to do..
1727                  */
1728                 bp = bioq_first(&softc->bio_queue);
1729                 if (periph->immediate_priority <= periph->pinfo.priority) {
1730                         CAM_DEBUG_PRINT(CAM_DEBUG_SUBTRACE,
1731                                         ("queuing for immediate ccb\n"));
1732                         Set_CCB_Type(start_ccb, SA_CCB_WAITING);
1733                         SLIST_INSERT_HEAD(&periph->ccb_list, &start_ccb->ccb_h,
1734                                           periph_links.sle);
1735                         periph->immediate_priority = CAM_PRIORITY_NONE;
1736                         wakeup(&periph->ccb_list);
1737                 } else if (bp == NULL) {
1738                         xpt_release_ccb(start_ccb);
1739                 } else if ((softc->flags & SA_FLAG_ERR_PENDING) != 0) {
1740                         struct bio *done_bp;
1741 again:
1742                         softc->queue_count--;
1743                         bioq_remove(&softc->bio_queue, bp);
1744                         bp->bio_resid = bp->bio_bcount;
1745                         done_bp = bp;
1746                         if ((softc->flags & SA_FLAG_EOM_PENDING) != 0) {
1747                                 /*
1748                                  * We now just clear errors in this case
1749                                  * and let the residual be the notifier.
1750                                  */
1751                                 bp->bio_error = 0;
1752                         } else if ((softc->flags & SA_FLAG_EOF_PENDING) != 0) {
1753                                 /*
1754                                  * This can only happen if we're reading
1755                                  * in fixed length mode. In this case,
1756                                  * we dump the rest of the list the
1757                                  * same way.
1758                                  */
1759                                 bp->bio_error = 0;
1760                                 if (bioq_first(&softc->bio_queue) != NULL) {
1761                                         biodone(done_bp);
1762                                         goto again;
1763                                 }
1764                         } else if ((softc->flags & SA_FLAG_EIO_PENDING) != 0) {
1765                                 bp->bio_error = EIO;
1766                                 bp->bio_flags |= BIO_ERROR;
1767                         }
1768                         bp = bioq_first(&softc->bio_queue);
1769                         /*
1770                          * Only if we have no other buffers queued up
1771                          * do we clear the pending error flag.
1772                          */
1773                         if (bp == NULL)
1774                                 softc->flags &= ~SA_FLAG_ERR_PENDING;
1775                         CAM_DEBUG(periph->path, CAM_DEBUG_INFO,
1776                             ("sastart- ERR_PENDING now 0x%x, bp is %sNULL, "
1777                             "%d more buffers queued up\n",
1778                             (softc->flags & SA_FLAG_ERR_PENDING),
1779                             (bp != NULL)? "not " : " ", softc->queue_count));
1780                         xpt_release_ccb(start_ccb);
1781                         biodone(done_bp);
1782                 } else {
1783                         u_int32_t length;
1784
1785                         bioq_remove(&softc->bio_queue, bp);
1786                         softc->queue_count--;
1787
1788                         if ((softc->flags & SA_FLAG_FIXED) != 0) {
1789                                 if (softc->blk_shift != 0) {
1790                                         length =
1791                                             bp->bio_bcount >> softc->blk_shift;
1792                                 } else if (softc->media_blksize != 0) {
1793                                         length = bp->bio_bcount /
1794                                             softc->media_blksize;
1795                                 } else {
1796                                         bp->bio_error = EIO;
1797                                         xpt_print(periph->path, "zero blocksize"
1798                                             " for FIXED length writes?\n");
1799                                         biodone(bp);
1800                                         break;
1801                                 }
1802 #if     0
1803                                 CAM_DEBUG(start_ccb->ccb_h.path, CAM_DEBUG_INFO,
1804                                     ("issuing a %d fixed record %s\n",
1805                                     length,  (bp->bio_cmd == BIO_READ)? "read" :
1806                                     "write"));
1807 #endif
1808                         } else {
1809                                 length = bp->bio_bcount;
1810 #if     0
1811                                 CAM_DEBUG(start_ccb->ccb_h.path, CAM_DEBUG_INFO,
1812                                     ("issuing a %d variable byte %s\n",
1813                                     length,  (bp->bio_cmd == BIO_READ)? "read" :
1814                                     "write"));
1815 #endif
1816                         }
1817                         devstat_start_transaction_bio(softc->device_stats, bp);
1818                         /*
1819                          * Some people have theorized that we should
1820                          * suppress illegal length indication if we are
1821                          * running in variable block mode so that we don't
1822                          * have to request sense every time our requested
1823                          * block size is larger than the written block.
1824                          * The residual information from the ccb allows
1825                          * us to identify this situation anyway.  The only
1826                          * problem with this is that we will not get
1827                          * information about blocks that are larger than
1828                          * our read buffer unless we set the block size
1829                          * in the mode page to something other than 0.
1830                          *
1831                          * I believe that this is a non-issue. If user apps
1832                          * don't adjust their read size to match our record
1833                          * size, that's just life. Anyway, the typical usage
1834                          * would be to issue, e.g., 64KB reads and occasionally
1835                          * have to do deal with 512 byte or 1KB intermediate
1836                          * records.
1837                          */
1838                         softc->dsreg = (bp->bio_cmd == BIO_READ)?
1839                             MTIO_DSREG_RD : MTIO_DSREG_WR;
1840                         scsi_sa_read_write(&start_ccb->csio, 0, sadone,
1841                             MSG_SIMPLE_Q_TAG, (bp->bio_cmd == BIO_READ ?
1842                             SCSI_RW_READ : SCSI_RW_WRITE) |
1843                             ((bp->bio_flags & BIO_UNMAPPED) != 0 ?
1844                             SCSI_RW_BIO : 0), FALSE,
1845                             (softc->flags & SA_FLAG_FIXED) != 0, length,
1846                             (bp->bio_flags & BIO_UNMAPPED) != 0 ? (void *)bp :
1847                             bp->bio_data, bp->bio_bcount, SSD_FULL_SIZE,
1848                             IO_TIMEOUT);
1849                         start_ccb->ccb_h.ccb_pflags &= ~SA_POSITION_UPDATED;
1850                         Set_CCB_Type(start_ccb, SA_CCB_BUFFER_IO);
1851                         start_ccb->ccb_h.ccb_bp = bp;
1852                         bp = bioq_first(&softc->bio_queue);
1853                         xpt_action(start_ccb);
1854                 }
1855
1856                 if (bp != NULL) {
1857                         /* Have more work to do, so ensure we stay scheduled */
1858                         xpt_schedule(periph, CAM_PRIORITY_NORMAL);
1859                 }
1860                 break;
1861         }
1862         case SA_STATE_ABNORMAL:
1863         default:
1864                 panic("state 0x%x in sastart", softc->state);
1865                 break;
1866         }
1867 }
1868
1869
1870 static void
1871 sadone(struct cam_periph *periph, union ccb *done_ccb)
1872 {
1873         struct sa_softc *softc;
1874         struct ccb_scsiio *csio;
1875
1876         softc = (struct sa_softc *)periph->softc;
1877         csio = &done_ccb->csio;
1878         switch (CCB_Type(csio)) {
1879         case SA_CCB_BUFFER_IO:
1880         {
1881                 struct bio *bp;
1882                 int error;
1883
1884                 softc->dsreg = MTIO_DSREG_REST;
1885                 bp = (struct bio *)done_ccb->ccb_h.ccb_bp;
1886                 error = 0;
1887                 if ((done_ccb->ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_CMP) {
1888                         if ((error = saerror(done_ccb, 0, 0)) == ERESTART) {
1889                                 /*
1890                                  * A retry was scheduled, so just return.
1891                                  */
1892                                 return;
1893                         }
1894                 }
1895
1896                 if (error == EIO) {
1897
1898                         /*
1899                          * Catastrophic error. Mark the tape as frozen
1900                          * (we no longer know tape position).
1901                          *
1902                          * Return all queued I/O with EIO, and unfreeze
1903                          * our queue so that future transactions that
1904                          * attempt to fix this problem can get to the
1905                          * device.
1906                          *
1907                          */
1908
1909                         softc->flags |= SA_FLAG_TAPE_FROZEN;
1910                         bioq_flush(&softc->bio_queue, NULL, EIO);
1911                 }
1912                 if (error != 0) {
1913                         bp->bio_resid = bp->bio_bcount;
1914                         bp->bio_error = error;
1915                         bp->bio_flags |= BIO_ERROR;
1916                         /*
1917                          * In the error case, position is updated in saerror.
1918                          */
1919                 } else {
1920                         bp->bio_resid = csio->resid;
1921                         bp->bio_error = 0;
1922                         if (csio->resid != 0) {
1923                                 bp->bio_flags |= BIO_ERROR;
1924                         }
1925                         if (bp->bio_cmd == BIO_WRITE) {
1926                                 softc->flags |= SA_FLAG_TAPE_WRITTEN;
1927                                 softc->filemarks = 0;
1928                         }
1929                         if (!(csio->ccb_h.ccb_pflags & SA_POSITION_UPDATED) &&
1930                             (softc->blkno != (daddr_t) -1)) {
1931                                 if ((softc->flags & SA_FLAG_FIXED) != 0) {
1932                                         u_int32_t l;
1933                                         if (softc->blk_shift != 0) {
1934                                                 l = bp->bio_bcount >>
1935                                                         softc->blk_shift;
1936                                         } else {
1937                                                 l = bp->bio_bcount /
1938                                                         softc->media_blksize;
1939                                         }
1940                                         softc->blkno += (daddr_t) l;
1941                                 } else {
1942                                         softc->blkno++;
1943                                 }
1944                         }
1945                 }
1946                 /*
1947                  * If we had an error (immediate or pending),
1948                  * release the device queue now.
1949                  */
1950                 if (error || (softc->flags & SA_FLAG_ERR_PENDING))
1951                         cam_release_devq(done_ccb->ccb_h.path, 0, 0, 0, 0);
1952                 if (error || bp->bio_resid) {
1953                         CAM_DEBUG(periph->path, CAM_DEBUG_INFO,
1954                                   ("error %d resid %ld count %ld\n", error,
1955                                   bp->bio_resid, bp->bio_bcount));
1956                 }
1957                 biofinish(bp, softc->device_stats, 0);
1958                 break;
1959         }
1960         case SA_CCB_WAITING:
1961         {
1962                 /* Caller will release the CCB */
1963                 wakeup(&done_ccb->ccb_h.cbfcnp);
1964                 return;
1965         }
1966         }
1967         xpt_release_ccb(done_ccb);
1968 }
1969
1970 /*
1971  * Mount the tape (make sure it's ready for I/O).
1972  */
1973 static int
1974 samount(struct cam_periph *periph, int oflags, struct cdev *dev)
1975 {
1976         struct  sa_softc *softc;
1977         union   ccb *ccb;
1978         int     error;
1979
1980         /*
1981          * oflags can be checked for 'kind' of open (read-only check) - later
1982          * dev can be checked for a control-mode or compression open - later
1983          */
1984         UNUSED_PARAMETER(oflags);
1985         UNUSED_PARAMETER(dev);
1986
1987
1988         softc = (struct sa_softc *)periph->softc;
1989
1990         /*
1991          * This should determine if something has happend since the last
1992          * open/mount that would invalidate the mount. We do *not* want
1993          * to retry this command- we just want the status. But we only
1994          * do this if we're mounted already- if we're not mounted,
1995          * we don't care about the unit read state and can instead use
1996          * this opportunity to attempt to reserve the tape unit.
1997          */
1998
1999         if (softc->flags & SA_FLAG_TAPE_MOUNTED) {
2000                 ccb = cam_periph_getccb(periph, 1);
2001                 scsi_test_unit_ready(&ccb->csio, 0, sadone,
2002                     MSG_SIMPLE_Q_TAG, SSD_FULL_SIZE, IO_TIMEOUT);
2003                 error = cam_periph_runccb(ccb, saerror, 0, SF_NO_PRINT,
2004                     softc->device_stats);
2005                 if (error == ENXIO) {
2006                         softc->flags &= ~SA_FLAG_TAPE_MOUNTED;
2007                         scsi_test_unit_ready(&ccb->csio, 0, sadone,
2008                             MSG_SIMPLE_Q_TAG, SSD_FULL_SIZE, IO_TIMEOUT);
2009                         error = cam_periph_runccb(ccb, saerror, 0, SF_NO_PRINT,
2010                             softc->device_stats);
2011                 } else if (error) {
2012                         /*
2013                          * We don't need to freeze the tape because we
2014                          * will now attempt to rewind/load it.
2015                          */
2016                         softc->flags &= ~SA_FLAG_TAPE_MOUNTED;
2017                         if (CAM_DEBUGGED(periph->path, CAM_DEBUG_INFO)) {
2018                                 xpt_print(periph->path,
2019                                     "error %d on TUR in samount\n", error);
2020                         }
2021                 }
2022         } else {
2023                 error = sareservereleaseunit(periph, TRUE);
2024                 if (error) {
2025                         return (error);
2026                 }
2027                 ccb = cam_periph_getccb(periph, 1);
2028                 scsi_test_unit_ready(&ccb->csio, 0, sadone,
2029                     MSG_SIMPLE_Q_TAG, SSD_FULL_SIZE, IO_TIMEOUT);
2030                 error = cam_periph_runccb(ccb, saerror, 0, SF_NO_PRINT,
2031                     softc->device_stats);
2032         }
2033
2034         if ((softc->flags & SA_FLAG_TAPE_MOUNTED) == 0) {
2035                 struct scsi_read_block_limits_data *rblim = NULL;
2036                 int comp_enabled, comp_supported;
2037                 u_int8_t write_protect, guessing = 0;
2038
2039                 /*
2040                  * Clear out old state.
2041                  */
2042                 softc->flags &= ~(SA_FLAG_TAPE_WP|SA_FLAG_TAPE_WRITTEN|
2043                                   SA_FLAG_ERR_PENDING|SA_FLAG_COMP_ENABLED|
2044                                   SA_FLAG_COMP_SUPP|SA_FLAG_COMP_UNSUPP);
2045                 softc->filemarks = 0;
2046
2047                 /*
2048                  * *Very* first off, make sure we're loaded to BOT.
2049                  */
2050                 scsi_load_unload(&ccb->csio, 2, sadone, MSG_SIMPLE_Q_TAG, FALSE,
2051                     FALSE, FALSE, 1, SSD_FULL_SIZE, REWIND_TIMEOUT);
2052                 error = cam_periph_runccb(ccb, saerror, 0, SF_NO_PRINT,
2053                     softc->device_stats);
2054
2055                 /*
2056                  * In case this doesn't work, do a REWIND instead
2057                  */
2058                 if (error) {
2059                         scsi_rewind(&ccb->csio, 2, sadone, MSG_SIMPLE_Q_TAG,
2060                             FALSE, SSD_FULL_SIZE, REWIND_TIMEOUT);
2061                         error = cam_periph_runccb(ccb, saerror, 0, SF_NO_PRINT,
2062                                 softc->device_stats);
2063                 }
2064                 if (error) {
2065                         xpt_release_ccb(ccb);
2066                         goto exit;
2067                 }
2068
2069                 /*
2070                  * Do a dummy test read to force access to the
2071                  * media so that the drive will really know what's
2072                  * there. We actually don't really care what the
2073                  * blocksize on tape is and don't expect to really
2074                  * read a full record.
2075                  */
2076                 rblim = (struct  scsi_read_block_limits_data *)
2077                     malloc(8192, M_SCSISA, M_NOWAIT);
2078                 if (rblim == NULL) {
2079                         xpt_print(periph->path, "no memory for test read\n");
2080                         xpt_release_ccb(ccb);
2081                         error = ENOMEM;
2082                         goto exit;
2083                 }
2084
2085                 if ((softc->quirks & SA_QUIRK_NODREAD) == 0) {
2086                         scsi_sa_read_write(&ccb->csio, 0, sadone,
2087                             MSG_SIMPLE_Q_TAG, 1, FALSE, 0, 8192,
2088                             (void *) rblim, 8192, SSD_FULL_SIZE,
2089                             IO_TIMEOUT);
2090                         (void) cam_periph_runccb(ccb, saerror, 0, SF_NO_PRINT,
2091                             softc->device_stats);
2092                         scsi_rewind(&ccb->csio, 1, sadone, MSG_SIMPLE_Q_TAG,
2093                             FALSE, SSD_FULL_SIZE, REWIND_TIMEOUT);
2094                         error = cam_periph_runccb(ccb, saerror, CAM_RETRY_SELTO,
2095                             SF_NO_PRINT | SF_RETRY_UA,
2096                             softc->device_stats);
2097                         if (error) {
2098                                 xpt_print(periph->path,
2099                                     "unable to rewind after test read\n");
2100                                 xpt_release_ccb(ccb);
2101                                 goto exit;
2102                         }
2103                 }
2104
2105                 /*
2106                  * Next off, determine block limits.
2107                  */
2108                 scsi_read_block_limits(&ccb->csio, 5, sadone, MSG_SIMPLE_Q_TAG,
2109                     rblim, SSD_FULL_SIZE, SCSIOP_TIMEOUT);
2110
2111                 error = cam_periph_runccb(ccb, saerror, CAM_RETRY_SELTO,
2112                     SF_NO_PRINT | SF_RETRY_UA, softc->device_stats);
2113
2114                 xpt_release_ccb(ccb);
2115
2116                 if (error != 0) {
2117                         /*
2118                          * If it's less than SCSI-2, READ BLOCK LIMITS is not
2119                          * a MANDATORY command. Anyway- it doesn't matter-
2120                          * we can proceed anyway.
2121                          */
2122                         softc->blk_gran = 0;
2123                         softc->max_blk = ~0;
2124                         softc->min_blk = 0;
2125                 } else {
2126                         if (softc->scsi_rev >= SCSI_REV_SPC) {
2127                                 softc->blk_gran = RBL_GRAN(rblim);
2128                         } else {
2129                                 softc->blk_gran = 0;
2130                         }
2131                         /*
2132                          * We take max_blk == min_blk to mean a default to
2133                          * fixed mode- but note that whatever we get out of
2134                          * sagetparams below will actually determine whether
2135                          * we are actually *in* fixed mode.
2136                          */
2137                         softc->max_blk = scsi_3btoul(rblim->maximum);
2138                         softc->min_blk = scsi_2btoul(rblim->minimum);
2139
2140
2141                 }
2142                 /*
2143                  * Next, perform a mode sense to determine
2144                  * current density, blocksize, compression etc.
2145                  */
2146                 error = sagetparams(periph, SA_PARAM_ALL,
2147                                     &softc->media_blksize,
2148                                     &softc->media_density,
2149                                     &softc->media_numblks,
2150                                     &softc->buffer_mode, &write_protect,
2151                                     &softc->speed, &comp_supported,
2152                                     &comp_enabled, &softc->comp_algorithm,
2153                                     NULL);
2154
2155                 if (error != 0) {
2156                         /*
2157                          * We could work a little harder here. We could
2158                          * adjust our attempts to get information. It
2159                          * might be an ancient tape drive. If someone
2160                          * nudges us, we'll do that.
2161                          */
2162                         goto exit;
2163                 }
2164
2165                 /*
2166                  * If no quirk has determined that this is a device that is
2167                  * preferred to be in fixed or variable mode, now is the time
2168                  * to find out.
2169                  */
2170                 if ((softc->quirks & (SA_QUIRK_FIXED|SA_QUIRK_VARIABLE)) == 0) {
2171                         guessing = 1;
2172                         /*
2173                          * This could be expensive to find out. Luckily we
2174                          * only need to do this once. If we start out in
2175                          * 'default' mode, try and set ourselves to one
2176                          * of the densities that would determine a wad
2177                          * of other stuff. Go from highest to lowest.
2178                          */
2179                         if (softc->media_density == SCSI_DEFAULT_DENSITY) {
2180                                 int i;
2181                                 static u_int8_t ctry[] = {
2182                                         SCSI_DENSITY_HALFINCH_PE,
2183                                         SCSI_DENSITY_HALFINCH_6250C,
2184                                         SCSI_DENSITY_HALFINCH_6250,
2185                                         SCSI_DENSITY_HALFINCH_1600,
2186                                         SCSI_DENSITY_HALFINCH_800,
2187                                         SCSI_DENSITY_QIC_4GB,
2188                                         SCSI_DENSITY_QIC_2GB,
2189                                         SCSI_DENSITY_QIC_525_320,
2190                                         SCSI_DENSITY_QIC_150,
2191                                         SCSI_DENSITY_QIC_120,
2192                                         SCSI_DENSITY_QIC_24,
2193                                         SCSI_DENSITY_QIC_11_9TRK,
2194                                         SCSI_DENSITY_QIC_11_4TRK,
2195                                         SCSI_DENSITY_QIC_1320,
2196                                         SCSI_DENSITY_QIC_3080,
2197                                         0
2198                                 };
2199                                 for (i = 0; ctry[i]; i++) {
2200                                         error = sasetparams(periph,
2201                                             SA_PARAM_DENSITY, 0, ctry[i],
2202                                             0, SF_NO_PRINT);
2203                                         if (error == 0) {
2204                                                 softc->media_density = ctry[i];
2205                                                 break;
2206                                         }
2207                                 }
2208                         }
2209                         switch (softc->media_density) {
2210                         case SCSI_DENSITY_QIC_11_4TRK:
2211                         case SCSI_DENSITY_QIC_11_9TRK:
2212                         case SCSI_DENSITY_QIC_24:
2213                         case SCSI_DENSITY_QIC_120:
2214                         case SCSI_DENSITY_QIC_150:
2215                         case SCSI_DENSITY_QIC_525_320:
2216                         case SCSI_DENSITY_QIC_1320:
2217                         case SCSI_DENSITY_QIC_3080:
2218                                 softc->quirks &= ~SA_QUIRK_2FM;
2219                                 softc->quirks |= SA_QUIRK_FIXED|SA_QUIRK_1FM;
2220                                 softc->last_media_blksize = 512;
2221                                 break;
2222                         case SCSI_DENSITY_QIC_4GB:
2223                         case SCSI_DENSITY_QIC_2GB:
2224                                 softc->quirks &= ~SA_QUIRK_2FM;
2225                                 softc->quirks |= SA_QUIRK_FIXED|SA_QUIRK_1FM;
2226                                 softc->last_media_blksize = 1024;
2227                                 break;
2228                         default:
2229                                 softc->last_media_blksize =
2230                                     softc->media_blksize;
2231                                 softc->quirks |= SA_QUIRK_VARIABLE;
2232                                 break;
2233                         }
2234                 }
2235
2236                 /*
2237                  * If no quirk has determined that this is a device that needs
2238                  * to have 2 Filemarks at EOD, now is the time to find out.
2239                  */
2240
2241                 if ((softc->quirks & SA_QUIRK_2FM) == 0) {
2242                         switch (softc->media_density) {
2243                         case SCSI_DENSITY_HALFINCH_800:
2244                         case SCSI_DENSITY_HALFINCH_1600:
2245                         case SCSI_DENSITY_HALFINCH_6250:
2246                         case SCSI_DENSITY_HALFINCH_6250C:
2247                         case SCSI_DENSITY_HALFINCH_PE:
2248                                 softc->quirks &= ~SA_QUIRK_1FM;
2249                                 softc->quirks |= SA_QUIRK_2FM;
2250                                 break;
2251                         default:
2252                                 break;
2253                         }
2254                 }
2255
2256                 /*
2257                  * Now validate that some info we got makes sense.
2258                  */
2259                 if ((softc->max_blk < softc->media_blksize) ||
2260                     (softc->min_blk > softc->media_blksize &&
2261                     softc->media_blksize)) {
2262                         xpt_print(periph->path,
2263                             "BLOCK LIMITS (%d..%d) could not match current "
2264                             "block settings (%d)- adjusting\n", softc->min_blk,
2265                             softc->max_blk, softc->media_blksize);
2266                         softc->max_blk = softc->min_blk =
2267                             softc->media_blksize;
2268                 }
2269
2270                 /*
2271                  * Now put ourselves into the right frame of mind based
2272                  * upon quirks...
2273                  */
2274 tryagain:
2275                 /*
2276                  * If we want to be in FIXED mode and our current blocksize
2277                  * is not equal to our last blocksize (if nonzero), try and
2278                  * set ourselves to this last blocksize (as the 'preferred'
2279                  * block size).  The initial quirkmatch at registry sets the
2280                  * initial 'last' blocksize. If, for whatever reason, this
2281                  * 'last' blocksize is zero, set the blocksize to 512,
2282                  * or min_blk if that's larger.
2283                  */
2284                 if ((softc->quirks & SA_QUIRK_FIXED) &&
2285                     (softc->quirks & SA_QUIRK_NO_MODESEL) == 0 &&
2286                     (softc->media_blksize != softc->last_media_blksize)) {
2287                         softc->media_blksize = softc->last_media_blksize;
2288                         if (softc->media_blksize == 0) {
2289                                 softc->media_blksize = 512;
2290                                 if (softc->media_blksize < softc->min_blk) {
2291                                         softc->media_blksize = softc->min_blk;
2292                                 }
2293                         }
2294                         error = sasetparams(periph, SA_PARAM_BLOCKSIZE,
2295                             softc->media_blksize, 0, 0, SF_NO_PRINT);
2296                         if (error) {
2297                                 xpt_print(periph->path,
2298                                     "unable to set fixed blocksize to %d\n",
2299                                     softc->media_blksize);
2300                                 goto exit;
2301                         }
2302                 }
2303
2304                 if ((softc->quirks & SA_QUIRK_VARIABLE) &&
2305                     (softc->media_blksize != 0)) {
2306                         softc->last_media_blksize = softc->media_blksize;
2307                         softc->media_blksize = 0;
2308                         error = sasetparams(periph, SA_PARAM_BLOCKSIZE,
2309                             0, 0, 0, SF_NO_PRINT);
2310                         if (error) {
2311                                 /*
2312                                  * If this fails and we were guessing, just
2313                                  * assume that we got it wrong and go try
2314                                  * fixed block mode. Don't even check against
2315                                  * density code at this point.
2316                                  */
2317                                 if (guessing) {
2318                                         softc->quirks &= ~SA_QUIRK_VARIABLE;
2319                                         softc->quirks |= SA_QUIRK_FIXED;
2320                                         if (softc->last_media_blksize == 0)
2321                                                 softc->last_media_blksize = 512;
2322                                         goto tryagain;
2323                                 }
2324                                 xpt_print(periph->path,
2325                                     "unable to set variable blocksize\n");
2326                                 goto exit;
2327                         }
2328                 }
2329
2330                 /*
2331                  * Now that we have the current block size,
2332                  * set up some parameters for sastart's usage.
2333                  */
2334                 if (softc->media_blksize) {
2335                         softc->flags |= SA_FLAG_FIXED;
2336                         if (powerof2(softc->media_blksize)) {
2337                                 softc->blk_shift =
2338                                     ffs(softc->media_blksize) - 1;
2339                                 softc->blk_mask = softc->media_blksize - 1;
2340                         } else {
2341                                 softc->blk_mask = ~0;
2342                                 softc->blk_shift = 0;
2343                         }
2344                 } else {
2345                         /*
2346                          * The SCSI-3 spec allows 0 to mean "unspecified".
2347                          * The SCSI-1 spec allows 0 to mean 'infinite'.
2348                          *
2349                          * Either works here.
2350                          */
2351                         if (softc->max_blk == 0) {
2352                                 softc->max_blk = ~0;
2353                         }
2354                         softc->blk_shift = 0;
2355                         if (softc->blk_gran != 0) {
2356                                 softc->blk_mask = softc->blk_gran - 1;
2357                         } else {
2358                                 softc->blk_mask = 0;
2359                         }
2360                 }
2361
2362                 if (write_protect)
2363                         softc->flags |= SA_FLAG_TAPE_WP;
2364
2365                 if (comp_supported) {
2366                         if (softc->saved_comp_algorithm == 0)
2367                                 softc->saved_comp_algorithm =
2368                                     softc->comp_algorithm;
2369                         softc->flags |= SA_FLAG_COMP_SUPP;
2370                         if (comp_enabled)
2371                                 softc->flags |= SA_FLAG_COMP_ENABLED;
2372                 } else
2373                         softc->flags |= SA_FLAG_COMP_UNSUPP;
2374
2375                 if ((softc->buffer_mode == SMH_SA_BUF_MODE_NOBUF) &&
2376                     (softc->quirks & SA_QUIRK_NO_MODESEL) == 0) {
2377                         error = sasetparams(periph, SA_PARAM_BUFF_MODE, 0,
2378                             0, 0, SF_NO_PRINT);
2379                         if (error == 0) {
2380                                 softc->buffer_mode = SMH_SA_BUF_MODE_SIBUF;
2381                         } else {
2382                                 xpt_print(periph->path,
2383                                     "unable to set buffered mode\n");
2384                         }
2385                         error = 0;      /* not an error */
2386                 }
2387
2388
2389                 if (error == 0) {
2390                         softc->flags |= SA_FLAG_TAPE_MOUNTED;
2391                 }
2392 exit:
2393                 if (rblim != NULL)
2394                         free(rblim, M_SCSISA);
2395
2396                 if (error != 0) {
2397                         softc->dsreg = MTIO_DSREG_NIL;
2398                 } else {
2399                         softc->fileno = softc->blkno = 0;
2400                         softc->dsreg = MTIO_DSREG_REST;
2401                 }
2402 #ifdef  SA_1FM_AT_EOD
2403                 if ((softc->quirks & SA_QUIRK_2FM) == 0)
2404                         softc->quirks |= SA_QUIRK_1FM;
2405 #else
2406                 if ((softc->quirks & SA_QUIRK_1FM) == 0)
2407                         softc->quirks |= SA_QUIRK_2FM;
2408 #endif
2409         } else
2410                 xpt_release_ccb(ccb);
2411
2412         /*
2413          * If we return an error, we're not mounted any more,
2414          * so release any device reservation.
2415          */
2416         if (error != 0) {
2417                 (void) sareservereleaseunit(periph, FALSE);
2418         } else {
2419                 /*
2420                  * Clear I/O residual.
2421                  */
2422                 softc->last_io_resid = 0;
2423                 softc->last_ctl_resid = 0;
2424         }
2425         return (error);
2426 }
2427
2428 /*
2429  * How many filemarks do we need to write if we were to terminate the
2430  * tape session right now? Note that this can be a negative number
2431  */
2432
2433 static int
2434 samarkswanted(struct cam_periph *periph)
2435 {
2436         int     markswanted;
2437         struct  sa_softc *softc;
2438
2439         softc = (struct sa_softc *)periph->softc;
2440         markswanted = 0;
2441         if ((softc->flags & SA_FLAG_TAPE_WRITTEN) != 0) {
2442                 markswanted++;
2443                 if (softc->quirks & SA_QUIRK_2FM)
2444                         markswanted++;
2445         }
2446         markswanted -= softc->filemarks;
2447         return (markswanted);
2448 }
2449
2450 static int
2451 sacheckeod(struct cam_periph *periph)
2452 {
2453         int     error;
2454         int     markswanted;
2455
2456         markswanted = samarkswanted(periph);
2457
2458         if (markswanted > 0) {
2459                 error = sawritefilemarks(periph, markswanted, FALSE);
2460         } else {
2461                 error = 0;
2462         }
2463         return (error);
2464 }
2465
2466 static int
2467 saerror(union ccb *ccb, u_int32_t cflgs, u_int32_t sflgs)
2468 {
2469         static const char *toobig =
2470             "%d-byte tape record bigger than supplied buffer\n";
2471         struct  cam_periph *periph;
2472         struct  sa_softc *softc;
2473         struct  ccb_scsiio *csio;
2474         struct  scsi_sense_data *sense;
2475         uint64_t resid = 0;
2476         int64_t info = 0;
2477         cam_status status;
2478         int error_code, sense_key, asc, ascq, error, aqvalid, stream_valid;
2479         int sense_len;
2480         uint8_t stream_bits;
2481
2482         periph = xpt_path_periph(ccb->ccb_h.path);
2483         softc = (struct sa_softc *)periph->softc;
2484         csio = &ccb->csio;
2485         sense = &csio->sense_data;
2486         sense_len = csio->sense_len - csio->sense_resid;
2487         scsi_extract_sense_len(sense, sense_len, &error_code, &sense_key,
2488             &asc, &ascq, /*show_errors*/ 1);
2489         if (asc != -1 && ascq != -1)
2490                 aqvalid = 1;
2491         else
2492                 aqvalid = 0;
2493         if (scsi_get_stream_info(sense, sense_len, NULL, &stream_bits) == 0)
2494                 stream_valid = 1;
2495         else
2496                 stream_valid = 0;
2497         error = 0;
2498
2499         status = csio->ccb_h.status & CAM_STATUS_MASK;
2500
2501         /*
2502          * Calculate/latch up, any residuals... We do this in a funny 2-step
2503          * so we can print stuff here if we have CAM_DEBUG enabled for this
2504          * unit.
2505          */
2506         if (status == CAM_SCSI_STATUS_ERROR) {
2507                 if (scsi_get_sense_info(sense, sense_len, SSD_DESC_INFO, &resid,
2508                                         &info) == 0) {
2509                         if ((softc->flags & SA_FLAG_FIXED) != 0)
2510                                 resid *= softc->media_blksize;
2511                 } else {
2512                         resid = csio->dxfer_len;
2513                         info = resid;
2514                         if ((softc->flags & SA_FLAG_FIXED) != 0) {
2515                                 if (softc->media_blksize)
2516                                         info /= softc->media_blksize;
2517                         }
2518                 }
2519                 if (CCB_Type(csio) == SA_CCB_BUFFER_IO) {
2520                         bcopy((caddr_t) sense, (caddr_t) &softc->last_io_sense,
2521                             sizeof (struct scsi_sense_data));
2522                         bcopy(csio->cdb_io.cdb_bytes, softc->last_io_cdb,
2523                             (int) csio->cdb_len);
2524                         softc->last_io_resid = resid;
2525                         softc->last_resid_was_io = 1;
2526                 } else {
2527                         bcopy((caddr_t) sense, (caddr_t) &softc->last_ctl_sense,
2528                             sizeof (struct scsi_sense_data));
2529                         bcopy(csio->cdb_io.cdb_bytes, softc->last_ctl_cdb,
2530                             (int) csio->cdb_len);
2531                         softc->last_ctl_resid = resid;
2532                         softc->last_resid_was_io = 0;
2533                 }
2534                 CAM_DEBUG(periph->path, CAM_DEBUG_INFO, ("CDB[0]=0x%x Key 0x%x "
2535                     "ASC/ASCQ 0x%x/0x%x CAM STATUS 0x%x flags 0x%x resid %jd "
2536                     "dxfer_len %d\n", csio->cdb_io.cdb_bytes[0] & 0xff,
2537                     sense_key, asc, ascq, status,
2538                     (stream_valid) ? stream_bits : 0, (intmax_t)resid,
2539                     csio->dxfer_len));
2540         } else {
2541                 CAM_DEBUG(periph->path, CAM_DEBUG_INFO,
2542                     ("Cam Status 0x%x\n", status));
2543         }
2544
2545         switch (status) {
2546         case CAM_REQ_CMP:
2547                 return (0);
2548         case CAM_SCSI_STATUS_ERROR:
2549                 /*
2550                  * If a read/write command, we handle it here.
2551                  */
2552                 if (CCB_Type(csio) != SA_CCB_WAITING) {
2553                         break;
2554                 }
2555                 /*
2556                  * If this was just EOM/EOP, Filemark, Setmark or ILI detected
2557                  * on a non read/write command, we assume it's not an error
2558                  * and propagate the residule and return.
2559                  */
2560                 if ((aqvalid && asc == 0 && ascq > 0 && ascq <= 5) ||
2561                     (aqvalid == 0 && sense_key == SSD_KEY_NO_SENSE)) {
2562                         csio->resid = resid;
2563                         QFRLS(ccb);
2564                         return (0);
2565                 }
2566                 /*
2567                  * Otherwise, we let the common code handle this.
2568                  */
2569                 return (cam_periph_error(ccb, cflgs, sflgs, &softc->saved_ccb));
2570
2571         /*
2572          * XXX: To Be Fixed
2573          * We cannot depend upon CAM honoring retry counts for these.
2574          */
2575         case CAM_SCSI_BUS_RESET:
2576         case CAM_BDR_SENT:
2577                 if (ccb->ccb_h.retry_count <= 0) {
2578                         return (EIO);
2579                 }
2580                 /* FALLTHROUGH */
2581         default:
2582                 return (cam_periph_error(ccb, cflgs, sflgs, &softc->saved_ccb));
2583         }
2584
2585         /*
2586          * Handle filemark, end of tape, mismatched record sizes....
2587          * From this point out, we're only handling read/write cases.
2588          * Handle writes && reads differently.
2589          */
2590
2591         if (csio->cdb_io.cdb_bytes[0] == SA_WRITE) {
2592                 if (sense_key == SSD_KEY_VOLUME_OVERFLOW) {
2593                         csio->resid = resid;
2594                         error = ENOSPC;
2595                 } else if ((stream_valid != 0) && (stream_bits & SSD_EOM)) {
2596                         softc->flags |= SA_FLAG_EOM_PENDING;
2597                         /*
2598                          * Grotesque as it seems, the few times
2599                          * I've actually seen a non-zero resid,
2600                          * the tape drive actually lied and had
2601                          * written all the data!.
2602                          */
2603                         csio->resid = 0;
2604                 }
2605         } else {
2606                 csio->resid = resid;
2607                 if (sense_key == SSD_KEY_BLANK_CHECK) {
2608                         if (softc->quirks & SA_QUIRK_1FM) {
2609                                 error = 0;
2610                                 softc->flags |= SA_FLAG_EOM_PENDING;
2611                         } else {
2612                                 error = EIO;
2613                         }
2614                 } else if ((stream_valid != 0) && (stream_bits & SSD_FILEMARK)){
2615                         if (softc->flags & SA_FLAG_FIXED) {
2616                                 error = -1;
2617                                 softc->flags |= SA_FLAG_EOF_PENDING;
2618                         }
2619                         /*
2620                          * Unconditionally, if we detected a filemark on a read,
2621                          * mark that we've run moved a file ahead.
2622                          */
2623                         if (softc->fileno != (daddr_t) -1) {
2624                                 softc->fileno++;
2625                                 softc->blkno = 0;
2626                                 csio->ccb_h.ccb_pflags |= SA_POSITION_UPDATED;
2627                         }
2628                 }
2629         }
2630
2631         /*
2632          * Incorrect Length usually applies to read, but can apply to writes.
2633          */
2634         if (error == 0 && (stream_valid != 0) && (stream_bits & SSD_ILI)) {
2635                 if (info < 0) {
2636                         xpt_print(csio->ccb_h.path, toobig,
2637                             csio->dxfer_len - info);
2638                         csio->resid = csio->dxfer_len;
2639                         error = EIO;
2640                 } else {
2641                         csio->resid = resid;
2642                         if (softc->flags & SA_FLAG_FIXED) {
2643                                 softc->flags |= SA_FLAG_EIO_PENDING;
2644                         }
2645                         /*
2646                          * Bump the block number if we hadn't seen a filemark.
2647                          * Do this independent of errors (we've moved anyway).
2648                          */
2649                         if ((stream_valid == 0) ||
2650                             (stream_bits & SSD_FILEMARK) == 0) {
2651                                 if (softc->blkno != (daddr_t) -1) {
2652                                         softc->blkno++;
2653                                         csio->ccb_h.ccb_pflags |=
2654                                            SA_POSITION_UPDATED;
2655                                 }
2656                         }
2657                 }
2658         }
2659
2660         if (error <= 0) {
2661                 /*
2662                  * Unfreeze the queue if frozen as we're not returning anything
2663                  * to our waiters that would indicate an I/O error has occurred
2664                  * (yet).
2665                  */
2666                 QFRLS(ccb);
2667                 error = 0;
2668         }
2669         return (error);
2670 }
2671
2672 static int
2673 sagetparams(struct cam_periph *periph, sa_params params_to_get,
2674             u_int32_t *blocksize, u_int8_t *density, u_int32_t *numblocks,
2675             int *buff_mode, u_int8_t *write_protect, u_int8_t *speed,
2676             int *comp_supported, int *comp_enabled, u_int32_t *comp_algorithm,
2677             sa_comp_t *tcs)
2678 {
2679         union ccb *ccb;
2680         void *mode_buffer;
2681         struct scsi_mode_header_6 *mode_hdr;
2682         struct scsi_mode_blk_desc *mode_blk;
2683         int mode_buffer_len;
2684         struct sa_softc *softc;
2685         u_int8_t cpage;
2686         int error;
2687         cam_status status;
2688
2689         softc = (struct sa_softc *)periph->softc;
2690         ccb = cam_periph_getccb(periph, 1);
2691         if (softc->quirks & SA_QUIRK_NO_CPAGE)
2692                 cpage = SA_DEVICE_CONFIGURATION_PAGE;
2693         else
2694                 cpage = SA_DATA_COMPRESSION_PAGE;
2695
2696 retry:
2697         mode_buffer_len = sizeof(*mode_hdr) + sizeof(*mode_blk);
2698
2699         if (params_to_get & SA_PARAM_COMPRESSION) {
2700                 if (softc->quirks & SA_QUIRK_NOCOMP) {
2701                         *comp_supported = FALSE;
2702                         params_to_get &= ~SA_PARAM_COMPRESSION;
2703                 } else
2704                         mode_buffer_len += sizeof (sa_comp_t);
2705         }
2706
2707         /* XXX Fix M_NOWAIT */
2708         mode_buffer = malloc(mode_buffer_len, M_SCSISA, M_NOWAIT | M_ZERO);
2709         if (mode_buffer == NULL) {
2710                 xpt_release_ccb(ccb);
2711                 return (ENOMEM);
2712         }
2713         mode_hdr = (struct scsi_mode_header_6 *)mode_buffer;
2714         mode_blk = (struct scsi_mode_blk_desc *)&mode_hdr[1];
2715
2716         /* it is safe to retry this */
2717         scsi_mode_sense(&ccb->csio, 5, sadone, MSG_SIMPLE_Q_TAG, FALSE,
2718             SMS_PAGE_CTRL_CURRENT, (params_to_get & SA_PARAM_COMPRESSION) ?
2719             cpage : SMS_VENDOR_SPECIFIC_PAGE, mode_buffer, mode_buffer_len,
2720             SSD_FULL_SIZE, SCSIOP_TIMEOUT);
2721
2722         error = cam_periph_runccb(ccb, saerror, 0, SF_NO_PRINT,
2723             softc->device_stats);
2724
2725         status = ccb->ccb_h.status & CAM_STATUS_MASK;
2726
2727         if (error == EINVAL && (params_to_get & SA_PARAM_COMPRESSION) != 0) {
2728                 /*
2729                  * Hmm. Let's see if we can try another page...
2730                  * If we've already done that, give up on compression
2731                  * for this device and remember this for the future
2732                  * and attempt the request without asking for compression
2733                  * info.
2734                  */
2735                 if (cpage == SA_DATA_COMPRESSION_PAGE) {
2736                         cpage = SA_DEVICE_CONFIGURATION_PAGE;
2737                         goto retry;
2738                 }
2739                 softc->quirks |= SA_QUIRK_NOCOMP;
2740                 free(mode_buffer, M_SCSISA);
2741                 goto retry;
2742         } else if (status == CAM_SCSI_STATUS_ERROR) {
2743                 /* Tell the user about the fatal error. */
2744                 scsi_sense_print(&ccb->csio);
2745                 goto sagetparamsexit;
2746         }
2747
2748         /*
2749          * If the user only wants the compression information, and
2750          * the device doesn't send back the block descriptor, it's
2751          * no big deal.  If the user wants more than just
2752          * compression, though, and the device doesn't pass back the
2753          * block descriptor, we need to send another mode sense to
2754          * get the block descriptor.
2755          */
2756         if ((mode_hdr->blk_desc_len == 0) &&
2757             (params_to_get & SA_PARAM_COMPRESSION) &&
2758             (params_to_get & ~(SA_PARAM_COMPRESSION))) {
2759
2760                 /*
2761                  * Decrease the mode buffer length by the size of
2762                  * the compression page, to make sure the data
2763                  * there doesn't get overwritten.
2764                  */
2765                 mode_buffer_len -= sizeof (sa_comp_t);
2766
2767                 /*
2768                  * Now move the compression page that we presumably
2769                  * got back down the memory chunk a little bit so
2770                  * it doesn't get spammed.
2771                  */
2772                 bcopy(&mode_hdr[0], &mode_hdr[1], sizeof (sa_comp_t));
2773                 bzero(&mode_hdr[0], sizeof (mode_hdr[0]));
2774
2775                 /*
2776                  * Now, we issue another mode sense and just ask
2777                  * for the block descriptor, etc.
2778                  */
2779
2780                 scsi_mode_sense(&ccb->csio, 2, sadone, MSG_SIMPLE_Q_TAG, FALSE,
2781                     SMS_PAGE_CTRL_CURRENT, SMS_VENDOR_SPECIFIC_PAGE,
2782                     mode_buffer, mode_buffer_len, SSD_FULL_SIZE,
2783                     SCSIOP_TIMEOUT);
2784
2785                 error = cam_periph_runccb(ccb, saerror, 0, SF_NO_PRINT,
2786                     softc->device_stats);
2787
2788                 if (error != 0)
2789                         goto sagetparamsexit;
2790         }
2791
2792         if (params_to_get & SA_PARAM_BLOCKSIZE)
2793                 *blocksize = scsi_3btoul(mode_blk->blklen);
2794
2795         if (params_to_get & SA_PARAM_NUMBLOCKS)
2796                 *numblocks = scsi_3btoul(mode_blk->nblocks);
2797
2798         if (params_to_get & SA_PARAM_BUFF_MODE)
2799                 *buff_mode = mode_hdr->dev_spec & SMH_SA_BUF_MODE_MASK;
2800
2801         if (params_to_get & SA_PARAM_DENSITY)
2802                 *density = mode_blk->density;
2803
2804         if (params_to_get & SA_PARAM_WP)
2805                 *write_protect = (mode_hdr->dev_spec & SMH_SA_WP)? TRUE : FALSE;
2806
2807         if (params_to_get & SA_PARAM_SPEED)
2808                 *speed = mode_hdr->dev_spec & SMH_SA_SPEED_MASK;
2809
2810         if (params_to_get & SA_PARAM_COMPRESSION) {
2811                 sa_comp_t *ntcs = (sa_comp_t *) &mode_blk[1];
2812                 if (cpage == SA_DATA_COMPRESSION_PAGE) {
2813                         struct scsi_data_compression_page *cp = &ntcs->dcomp;
2814                         *comp_supported =
2815                             (cp->dce_and_dcc & SA_DCP_DCC)? TRUE : FALSE;
2816                         *comp_enabled =
2817                             (cp->dce_and_dcc & SA_DCP_DCE)? TRUE : FALSE;
2818                         *comp_algorithm = scsi_4btoul(cp->comp_algorithm);
2819                 } else {
2820                         struct scsi_dev_conf_page *cp = &ntcs->dconf;
2821                         /*
2822                          * We don't really know whether this device supports
2823                          * Data Compression if the algorithm field is
2824                          * zero. Just say we do.
2825                          */
2826                         *comp_supported = TRUE;
2827                         *comp_enabled =
2828                             (cp->sel_comp_alg != SA_COMP_NONE)? TRUE : FALSE;
2829                         *comp_algorithm = cp->sel_comp_alg;
2830                 }
2831                 if (tcs != NULL)
2832                         bcopy(ntcs, tcs, sizeof (sa_comp_t));
2833         }
2834
2835         if (CAM_DEBUGGED(periph->path, CAM_DEBUG_INFO)) {
2836                 int idx;
2837                 char *xyz = mode_buffer;
2838                 xpt_print_path(periph->path);
2839                 printf("Mode Sense Data=");
2840                 for (idx = 0; idx < mode_buffer_len; idx++)
2841                         printf(" 0x%02x", xyz[idx] & 0xff);
2842                 printf("\n");
2843         }
2844
2845 sagetparamsexit:
2846
2847         xpt_release_ccb(ccb);
2848         free(mode_buffer, M_SCSISA);
2849         return (error);
2850 }
2851
2852 /*
2853  * The purpose of this function is to set one of four different parameters
2854  * for a tape drive:
2855  *      - blocksize
2856  *      - density
2857  *      - compression / compression algorithm
2858  *      - buffering mode
2859  *
2860  * The assumption is that this will be called from saioctl(), and therefore
2861  * from a process context.  Thus the waiting malloc calls below.  If that
2862  * assumption ever changes, the malloc calls should be changed to be
2863  * NOWAIT mallocs.
2864  *
2865  * Any or all of the four parameters may be set when this function is
2866  * called.  It should handle setting more than one parameter at once.
2867  */
2868 static int
2869 sasetparams(struct cam_periph *periph, sa_params params_to_set,
2870             u_int32_t blocksize, u_int8_t density, u_int32_t calg,
2871             u_int32_t sense_flags)
2872 {
2873         struct sa_softc *softc;
2874         u_int32_t current_blocksize;
2875         u_int32_t current_calg;
2876         u_int8_t current_density;
2877         u_int8_t current_speed;
2878         int comp_enabled, comp_supported;
2879         void *mode_buffer;
2880         int mode_buffer_len;
2881         struct scsi_mode_header_6 *mode_hdr;
2882         struct scsi_mode_blk_desc *mode_blk;
2883         sa_comp_t *ccomp, *cpage;
2884         int buff_mode;
2885         union ccb *ccb = NULL;
2886         int error;
2887
2888         softc = (struct sa_softc *)periph->softc;
2889
2890         ccomp = malloc(sizeof (sa_comp_t), M_SCSISA, M_NOWAIT);
2891         if (ccomp == NULL)
2892                 return (ENOMEM);
2893
2894         /*
2895          * Since it doesn't make sense to set the number of blocks, or
2896          * write protection, we won't try to get the current value.  We
2897          * always want to get the blocksize, so we can set it back to the
2898          * proper value.
2899          */
2900         error = sagetparams(periph,
2901             params_to_set | SA_PARAM_BLOCKSIZE | SA_PARAM_SPEED,
2902             &current_blocksize, &current_density, NULL, &buff_mode, NULL,
2903             &current_speed, &comp_supported, &comp_enabled,
2904             &current_calg, ccomp);
2905
2906         if (error != 0) {
2907                 free(ccomp, M_SCSISA);
2908                 return (error);
2909         }
2910
2911         mode_buffer_len = sizeof(*mode_hdr) + sizeof(*mode_blk);
2912         if (params_to_set & SA_PARAM_COMPRESSION)
2913                 mode_buffer_len += sizeof (sa_comp_t);
2914
2915         mode_buffer = malloc(mode_buffer_len, M_SCSISA, M_NOWAIT | M_ZERO);
2916         if (mode_buffer == NULL) {
2917                 free(ccomp, M_SCSISA);
2918                 return (ENOMEM);
2919         }
2920
2921         mode_hdr = (struct scsi_mode_header_6 *)mode_buffer;
2922         mode_blk = (struct scsi_mode_blk_desc *)&mode_hdr[1];
2923
2924         ccb = cam_periph_getccb(periph, 1);
2925
2926 retry:
2927
2928         if (params_to_set & SA_PARAM_COMPRESSION) {
2929                 if (mode_blk) {
2930                         cpage = (sa_comp_t *)&mode_blk[1];
2931                 } else {
2932                         cpage = (sa_comp_t *)&mode_hdr[1];
2933                 }
2934                 bcopy(ccomp, cpage, sizeof (sa_comp_t));
2935                 cpage->hdr.pagecode &= ~0x80;
2936         } else
2937                 cpage = NULL;
2938
2939         /*
2940          * If the caller wants us to set the blocksize, use the one they
2941          * pass in.  Otherwise, use the blocksize we got back from the
2942          * mode select above.
2943          */
2944         if (mode_blk) {
2945                 if (params_to_set & SA_PARAM_BLOCKSIZE)
2946                         scsi_ulto3b(blocksize, mode_blk->blklen);
2947                 else
2948                         scsi_ulto3b(current_blocksize, mode_blk->blklen);
2949
2950                 /*
2951                  * Set density if requested, else preserve old density.
2952                  * SCSI_SAME_DENSITY only applies to SCSI-2 or better
2953                  * devices, else density we've latched up in our softc.
2954                  */
2955                 if (params_to_set & SA_PARAM_DENSITY) {
2956                         mode_blk->density = density;
2957                 } else if (softc->scsi_rev > SCSI_REV_CCS) {
2958                         mode_blk->density = SCSI_SAME_DENSITY;
2959                 } else {
2960                         mode_blk->density = softc->media_density;
2961                 }
2962         }
2963
2964         /*
2965          * For mode selects, these two fields must be zero.
2966          */
2967         mode_hdr->data_length = 0;
2968         mode_hdr->medium_type = 0;
2969
2970         /* set the speed to the current value */
2971         mode_hdr->dev_spec = current_speed;
2972
2973         /* if set, set single-initiator buffering mode */
2974         if (softc->buffer_mode == SMH_SA_BUF_MODE_SIBUF) {
2975                 mode_hdr->dev_spec |= SMH_SA_BUF_MODE_SIBUF;
2976         }
2977
2978         if (mode_blk)
2979                 mode_hdr->blk_desc_len = sizeof(struct scsi_mode_blk_desc);
2980         else
2981                 mode_hdr->blk_desc_len = 0;
2982
2983         /*
2984          * First, if the user wants us to set the compression algorithm or
2985          * just turn compression on, check to make sure that this drive
2986          * supports compression.
2987          */
2988         if (params_to_set & SA_PARAM_COMPRESSION) {
2989                 /*
2990                  * If the compression algorithm is 0, disable compression.
2991                  * If the compression algorithm is non-zero, enable
2992                  * compression and set the compression type to the
2993                  * specified compression algorithm, unless the algorithm is
2994                  * MT_COMP_ENABLE.  In that case, we look at the
2995                  * compression algorithm that is currently set and if it is
2996                  * non-zero, we leave it as-is.  If it is zero, and we have
2997                  * saved a compression algorithm from a time when
2998                  * compression was enabled before, set the compression to
2999                  * the saved value.
3000                  */
3001                 switch (ccomp->hdr.pagecode & ~0x80) {
3002                 case SA_DEVICE_CONFIGURATION_PAGE:
3003                 {
3004                         struct scsi_dev_conf_page *dcp = &cpage->dconf;
3005                         if (calg == 0) {
3006                                 dcp->sel_comp_alg = SA_COMP_NONE;
3007                                 break;
3008                         }
3009                         if (calg != MT_COMP_ENABLE) {
3010                                 dcp->sel_comp_alg = calg;
3011                         } else if (dcp->sel_comp_alg == SA_COMP_NONE &&
3012                             softc->saved_comp_algorithm != 0) {
3013                                 dcp->sel_comp_alg = softc->saved_comp_algorithm;
3014                         }
3015                         break;
3016                 }
3017                 case SA_DATA_COMPRESSION_PAGE:
3018                 if (ccomp->dcomp.dce_and_dcc & SA_DCP_DCC) {
3019                         struct scsi_data_compression_page *dcp = &cpage->dcomp;
3020                         if (calg == 0) {
3021                                 /*
3022                                  * Disable compression, but leave the
3023                                  * decompression and the capability bit
3024                                  * alone.
3025                                  */
3026                                 dcp->dce_and_dcc = SA_DCP_DCC;
3027                                 dcp->dde_and_red |= SA_DCP_DDE;
3028                                 break;
3029                         }
3030                         /* enable compression && decompression */
3031                         dcp->dce_and_dcc = SA_DCP_DCE | SA_DCP_DCC;
3032                         dcp->dde_and_red |= SA_DCP_DDE;
3033                         /*
3034                          * If there, use compression algorithm from caller.
3035                          * Otherwise, if there's a saved compression algorithm
3036                          * and there is no current algorithm, use the saved
3037                          * algorithm. Else parrot back what we got and hope
3038                          * for the best.
3039                          */
3040                         if (calg != MT_COMP_ENABLE) {
3041                                 scsi_ulto4b(calg, dcp->comp_algorithm);
3042                                 scsi_ulto4b(calg, dcp->decomp_algorithm);
3043                         } else if (scsi_4btoul(dcp->comp_algorithm) == 0 &&
3044                             softc->saved_comp_algorithm != 0) {
3045                                 scsi_ulto4b(softc->saved_comp_algorithm,
3046                                     dcp->comp_algorithm);
3047                                 scsi_ulto4b(softc->saved_comp_algorithm,
3048                                     dcp->decomp_algorithm);
3049                         }
3050                         break;
3051                 }
3052                 /*
3053                  * Compression does not appear to be supported-
3054                  * at least via the DATA COMPRESSION page. It
3055                  * would be too much to ask us to believe that
3056                  * the page itself is supported, but incorrectly
3057                  * reports an ability to manipulate data compression,
3058                  * so we'll assume that this device doesn't support
3059                  * compression. We can just fall through for that.
3060                  */
3061                 /* FALLTHROUGH */
3062                 default:
3063                         /*
3064                          * The drive doesn't seem to support compression,
3065                          * so turn off the set compression bit.
3066                          */
3067                         params_to_set &= ~SA_PARAM_COMPRESSION;
3068                         xpt_print(periph->path,
3069                             "device does not seem to support compression\n");
3070
3071                         /*
3072                          * If that was the only thing the user wanted us to set,
3073                          * clean up allocated resources and return with
3074                          * 'operation not supported'.
3075                          */
3076                         if (params_to_set == SA_PARAM_NONE) {
3077                                 free(mode_buffer, M_SCSISA);
3078                                 xpt_release_ccb(ccb);
3079                                 return (ENODEV);
3080                         }
3081
3082                         /*
3083                          * That wasn't the only thing the user wanted us to set.
3084                          * So, decrease the stated mode buffer length by the
3085                          * size of the compression mode page.
3086                          */
3087                         mode_buffer_len -= sizeof(sa_comp_t);
3088                 }
3089         }
3090
3091         /* It is safe to retry this operation */
3092         scsi_mode_select(&ccb->csio, 5, sadone, MSG_SIMPLE_Q_TAG,
3093             (params_to_set & SA_PARAM_COMPRESSION)? TRUE : FALSE,
3094             FALSE, mode_buffer, mode_buffer_len, SSD_FULL_SIZE, SCSIOP_TIMEOUT);
3095
3096         error = cam_periph_runccb(ccb, saerror, 0,
3097             sense_flags, softc->device_stats);
3098
3099         if (CAM_DEBUGGED(periph->path, CAM_DEBUG_INFO)) {
3100                 int idx;
3101                 char *xyz = mode_buffer;
3102                 xpt_print_path(periph->path);
3103                 printf("Err%d, Mode Select Data=", error);
3104                 for (idx = 0; idx < mode_buffer_len; idx++)
3105                         printf(" 0x%02x", xyz[idx] & 0xff);
3106                 printf("\n");
3107         }
3108
3109
3110         if (error) {
3111                 /*
3112                  * If we can, try without setting density/blocksize.
3113                  */
3114                 if (mode_blk) {
3115                         if ((params_to_set &
3116                             (SA_PARAM_DENSITY|SA_PARAM_BLOCKSIZE)) == 0) {
3117                                 mode_blk = NULL;
3118                                 goto retry;
3119                         }
3120                 } else {
3121                         mode_blk = (struct scsi_mode_blk_desc *)&mode_hdr[1];
3122                         cpage = (sa_comp_t *)&mode_blk[1];
3123                 }
3124
3125                 /*
3126                  * If we were setting the blocksize, and that failed, we
3127                  * want to set it to its original value.  If we weren't
3128                  * setting the blocksize, we don't want to change it.
3129                  */
3130                 scsi_ulto3b(current_blocksize, mode_blk->blklen);
3131
3132                 /*
3133                  * Set density if requested, else preserve old density.
3134                  * SCSI_SAME_DENSITY only applies to SCSI-2 or better
3135                  * devices, else density we've latched up in our softc.
3136                  */
3137                 if (params_to_set & SA_PARAM_DENSITY) {
3138                         mode_blk->density = current_density;
3139                 } else if (softc->scsi_rev > SCSI_REV_CCS) {
3140                         mode_blk->density = SCSI_SAME_DENSITY;
3141                 } else {
3142                         mode_blk->density = softc->media_density;
3143                 }
3144
3145                 if (params_to_set & SA_PARAM_COMPRESSION)
3146                         bcopy(ccomp, cpage, sizeof (sa_comp_t));
3147
3148                 /*
3149                  * The retry count is the only CCB field that might have been
3150                  * changed that we care about, so reset it back to 1.
3151                  */
3152                 ccb->ccb_h.retry_count = 1;
3153                 cam_periph_runccb(ccb, saerror, 0, sense_flags,
3154                     softc->device_stats);
3155         }
3156
3157         xpt_release_ccb(ccb);
3158
3159         if (ccomp != NULL)
3160                 free(ccomp, M_SCSISA);
3161
3162         if (params_to_set & SA_PARAM_COMPRESSION) {
3163                 if (error) {
3164                         softc->flags &= ~SA_FLAG_COMP_ENABLED;
3165                         /*
3166                          * Even if we get an error setting compression,
3167                          * do not say that we don't support it. We could
3168                          * have been wrong, or it may be media specific.
3169                          *      softc->flags &= ~SA_FLAG_COMP_SUPP;
3170                          */
3171                         softc->saved_comp_algorithm = softc->comp_algorithm;
3172                         softc->comp_algorithm = 0;
3173                 } else {
3174                         softc->flags |= SA_FLAG_COMP_ENABLED;
3175                         softc->comp_algorithm = calg;
3176                 }
3177         }
3178
3179         free(mode_buffer, M_SCSISA);
3180         return (error);
3181 }
3182
3183 static void
3184 saprevent(struct cam_periph *periph, int action)
3185 {
3186         struct  sa_softc *softc;
3187         union   ccb *ccb;
3188         int     error, sf;
3189
3190         softc = (struct sa_softc *)periph->softc;
3191
3192         if ((action == PR_ALLOW) && (softc->flags & SA_FLAG_TAPE_LOCKED) == 0)
3193                 return;
3194         if ((action == PR_PREVENT) && (softc->flags & SA_FLAG_TAPE_LOCKED) != 0)
3195                 return;
3196
3197         /*
3198          * We can be quiet about illegal requests.
3199          */
3200         if (CAM_DEBUGGED(periph->path, CAM_DEBUG_INFO)) {
3201                 sf = 0;
3202         } else
3203                 sf = SF_QUIET_IR;
3204
3205         ccb = cam_periph_getccb(periph, 1);
3206
3207         /* It is safe to retry this operation */
3208         scsi_prevent(&ccb->csio, 5, sadone, MSG_SIMPLE_Q_TAG, action,
3209             SSD_FULL_SIZE, SCSIOP_TIMEOUT);
3210
3211         error = cam_periph_runccb(ccb, saerror, 0, sf, softc->device_stats);
3212         if (error == 0) {
3213                 if (action == PR_ALLOW)
3214                         softc->flags &= ~SA_FLAG_TAPE_LOCKED;
3215                 else
3216                         softc->flags |= SA_FLAG_TAPE_LOCKED;
3217         }
3218
3219         xpt_release_ccb(ccb);
3220 }
3221
3222 static int
3223 sarewind(struct cam_periph *periph)
3224 {
3225         union   ccb *ccb;
3226         struct  sa_softc *softc;
3227         int     error;
3228
3229         softc = (struct sa_softc *)periph->softc;
3230
3231         ccb = cam_periph_getccb(periph, 1);
3232
3233         /* It is safe to retry this operation */
3234         scsi_rewind(&ccb->csio, 2, sadone, MSG_SIMPLE_Q_TAG, FALSE,
3235             SSD_FULL_SIZE, REWIND_TIMEOUT);
3236
3237         softc->dsreg = MTIO_DSREG_REW;
3238         error = cam_periph_runccb(ccb, saerror, 0, 0, softc->device_stats);
3239         softc->dsreg = MTIO_DSREG_REST;
3240
3241         xpt_release_ccb(ccb);
3242         if (error == 0)
3243                 softc->fileno = softc->blkno = (daddr_t) 0;
3244         else
3245                 softc->fileno = softc->blkno = (daddr_t) -1;
3246         return (error);
3247 }
3248
3249 static int
3250 saspace(struct cam_periph *periph, int count, scsi_space_code code)
3251 {
3252         union   ccb *ccb;
3253         struct  sa_softc *softc;
3254         int     error;
3255
3256         softc = (struct sa_softc *)periph->softc;
3257
3258         ccb = cam_periph_getccb(periph, 1);
3259
3260         /* This cannot be retried */
3261
3262         scsi_space(&ccb->csio, 0, sadone, MSG_SIMPLE_Q_TAG, code, count,
3263             SSD_FULL_SIZE, SPACE_TIMEOUT);
3264
3265         /*
3266          * Clear residual because we will be using it.
3267          */
3268         softc->last_ctl_resid = 0;
3269
3270         softc->dsreg = (count < 0)? MTIO_DSREG_REV : MTIO_DSREG_FWD;
3271         error = cam_periph_runccb(ccb, saerror, 0, 0, softc->device_stats);
3272         softc->dsreg = MTIO_DSREG_REST;
3273
3274         xpt_release_ccb(ccb);
3275
3276         /*
3277          * If a spacing operation has failed, we need to invalidate
3278          * this mount.
3279          *
3280          * If the spacing operation was setmarks or to end of recorded data,
3281          * we no longer know our relative position.
3282          *
3283          * If the spacing operations was spacing files in reverse, we
3284          * take account of the residual, but still check against less
3285          * than zero- if we've gone negative, we must have hit BOT.
3286          *
3287          * If the spacing operations was spacing records in reverse and
3288          * we have a residual, we've either hit BOT or hit a filemark.
3289          * In the former case, we know our new record number (0). In
3290          * the latter case, we have absolutely no idea what the real
3291          * record number is- we've stopped between the end of the last
3292          * record in the previous file and the filemark that stopped
3293          * our spacing backwards.
3294          */
3295         if (error) {
3296                 softc->fileno = softc->blkno = (daddr_t) -1;
3297         } else if (code == SS_SETMARKS || code == SS_EOD) {
3298                 softc->fileno = softc->blkno = (daddr_t) -1;
3299         } else if (code == SS_FILEMARKS && softc->fileno != (daddr_t) -1) {
3300                 softc->fileno += (count - softc->last_ctl_resid);
3301                 if (softc->fileno < 0)  /* we must of hit BOT */
3302                         softc->fileno = 0;
3303                 softc->blkno = 0;
3304         } else if (code == SS_BLOCKS && softc->blkno != (daddr_t) -1) {
3305                 softc->blkno += (count - softc->last_ctl_resid);
3306                 if (count < 0) {
3307                         if (softc->last_ctl_resid || softc->blkno < 0) {
3308                                 if (softc->fileno == 0) {
3309                                         softc->blkno = 0;
3310                                 } else {
3311                                         softc->blkno = (daddr_t) -1;
3312                                 }
3313                         }
3314                 }
3315         }
3316         return (error);
3317 }
3318
3319 static int
3320 sawritefilemarks(struct cam_periph *periph, int nmarks, int setmarks)
3321 {
3322         union   ccb *ccb;
3323         struct  sa_softc *softc;
3324         int     error, nwm = 0;
3325
3326         softc = (struct sa_softc *)periph->softc;
3327         if (softc->open_rdonly)
3328                 return (EBADF);
3329
3330         ccb = cam_periph_getccb(periph, 1);
3331         /*
3332          * Clear residual because we will be using it.
3333          */
3334         softc->last_ctl_resid = 0;
3335
3336         softc->dsreg = MTIO_DSREG_FMK;
3337         /* this *must* not be retried */
3338         scsi_write_filemarks(&ccb->csio, 0, sadone, MSG_SIMPLE_Q_TAG,
3339             FALSE, setmarks, nmarks, SSD_FULL_SIZE, IO_TIMEOUT);
3340         softc->dsreg = MTIO_DSREG_REST;
3341
3342
3343         error = cam_periph_runccb(ccb, saerror, 0, 0, softc->device_stats);
3344
3345         if (error == 0 && nmarks) {
3346                 struct sa_softc *softc = (struct sa_softc *)periph->softc;
3347                 nwm = nmarks - softc->last_ctl_resid;
3348                 softc->filemarks += nwm;
3349         }
3350
3351         xpt_release_ccb(ccb);
3352
3353         /*
3354          * Update relative positions (if we're doing that).
3355          */
3356         if (error) {
3357                 softc->fileno = softc->blkno = (daddr_t) -1;
3358         } else if (softc->fileno != (daddr_t) -1) {
3359                 softc->fileno += nwm;
3360                 softc->blkno = 0;
3361         }
3362         return (error);
3363 }
3364
3365 static int
3366 sardpos(struct cam_periph *periph, int hard, u_int32_t *blkptr)
3367 {
3368         struct scsi_tape_position_data loc;
3369         union ccb *ccb;
3370         struct sa_softc *softc = (struct sa_softc *)periph->softc;
3371         int error;
3372
3373         /*
3374          * We try and flush any buffered writes here if we were writing
3375          * and we're trying to get hardware block position. It eats
3376          * up performance substantially, but I'm wary of drive firmware.
3377          *
3378          * I think that *logical* block position is probably okay-
3379          * but hardware block position might have to wait for data
3380          * to hit media to be valid. Caveat Emptor.
3381          */
3382
3383         if (hard && (softc->flags & SA_FLAG_TAPE_WRITTEN)) {
3384                 error = sawritefilemarks(periph, 0, 0);
3385                 if (error && error != EACCES)
3386                         return (error);
3387         }
3388
3389         ccb = cam_periph_getccb(periph, 1);
3390         scsi_read_position(&ccb->csio, 1, sadone, MSG_SIMPLE_Q_TAG,
3391             hard, &loc, SSD_FULL_SIZE, SCSIOP_TIMEOUT);
3392         softc->dsreg = MTIO_DSREG_RBSY;
3393         error = cam_periph_runccb(ccb, saerror, 0, 0, softc->device_stats);
3394         softc->dsreg = MTIO_DSREG_REST;
3395
3396         if (error == 0) {
3397                 if (loc.flags & SA_RPOS_UNCERTAIN) {
3398                         error = EINVAL;         /* nothing is certain */
3399                 } else {
3400                         *blkptr = scsi_4btoul(loc.firstblk);
3401                 }
3402         }
3403
3404         xpt_release_ccb(ccb);
3405         return (error);
3406 }
3407
3408 static int
3409 sasetpos(struct cam_periph *periph, int hard, u_int32_t *blkptr)
3410 {
3411         union ccb *ccb;
3412         struct sa_softc *softc;
3413         int error;
3414
3415         /*
3416          * We used to try and flush any buffered writes here.
3417          * Now we push this onto user applications to either
3418          * flush the pending writes themselves (via a zero count
3419          * WRITE FILEMARKS command) or they can trust their tape
3420          * drive to do this correctly for them.
3421          */
3422
3423         softc = (struct sa_softc *)periph->softc;
3424         ccb = cam_periph_getccb(periph, 1);
3425
3426
3427         scsi_set_position(&ccb->csio, 1, sadone, MSG_SIMPLE_Q_TAG,
3428             hard, *blkptr, SSD_FULL_SIZE, SPACE_TIMEOUT);
3429
3430
3431         softc->dsreg = MTIO_DSREG_POS;
3432         error = cam_periph_runccb(ccb, saerror, 0, 0, softc->device_stats);
3433         softc->dsreg = MTIO_DSREG_REST;
3434         xpt_release_ccb(ccb);
3435         /*
3436          * Note relative file && block number position as now unknown.
3437          */
3438         softc->fileno = softc->blkno = (daddr_t) -1;
3439         return (error);
3440 }
3441
3442 static int
3443 saretension(struct cam_periph *periph)
3444 {
3445         union ccb *ccb;
3446         struct sa_softc *softc;
3447         int error;
3448
3449         softc = (struct sa_softc *)periph->softc;
3450
3451         ccb = cam_periph_getccb(periph, 1);
3452
3453         /* It is safe to retry this operation */
3454         scsi_load_unload(&ccb->csio, 5, sadone, MSG_SIMPLE_Q_TAG, FALSE,
3455             FALSE, TRUE,  TRUE, SSD_FULL_SIZE, ERASE_TIMEOUT);
3456
3457         softc->dsreg = MTIO_DSREG_TEN;
3458         error = cam_periph_runccb(ccb, saerror, 0, 0, softc->device_stats);
3459         softc->dsreg = MTIO_DSREG_REST;
3460
3461         xpt_release_ccb(ccb);
3462         if (error == 0)
3463                 softc->fileno = softc->blkno = (daddr_t) 0;
3464         else
3465                 softc->fileno = softc->blkno = (daddr_t) -1;
3466         return (error);
3467 }
3468
3469 static int
3470 sareservereleaseunit(struct cam_periph *periph, int reserve)
3471 {
3472         union ccb *ccb;
3473         struct sa_softc *softc;
3474         int error;
3475
3476         softc = (struct sa_softc *)periph->softc;
3477         ccb = cam_periph_getccb(periph,  1);
3478
3479         /* It is safe to retry this operation */
3480         scsi_reserve_release_unit(&ccb->csio, 2, sadone, MSG_SIMPLE_Q_TAG,
3481             FALSE,  0, SSD_FULL_SIZE,  SCSIOP_TIMEOUT, reserve);
3482         softc->dsreg = MTIO_DSREG_RBSY;
3483         error = cam_periph_runccb(ccb, saerror, 0,
3484             SF_RETRY_UA | SF_NO_PRINT, softc->device_stats);
3485         softc->dsreg = MTIO_DSREG_REST;
3486         xpt_release_ccb(ccb);
3487
3488         /*
3489          * If the error was Illegal Request, then the device doesn't support
3490          * RESERVE/RELEASE. This is not an error.
3491          */
3492         if (error == EINVAL) {
3493                 error = 0;
3494         }
3495
3496         return (error);
3497 }
3498
3499 static int
3500 saloadunload(struct cam_periph *periph, int load)
3501 {
3502         union   ccb *ccb;
3503         struct  sa_softc *softc;
3504         int     error;
3505
3506         softc = (struct sa_softc *)periph->softc;
3507
3508         ccb = cam_periph_getccb(periph, 1);
3509
3510         /* It is safe to retry this operation */
3511         scsi_load_unload(&ccb->csio, 5, sadone, MSG_SIMPLE_Q_TAG, FALSE,
3512             FALSE, FALSE, load, SSD_FULL_SIZE, REWIND_TIMEOUT);
3513
3514         softc->dsreg = (load)? MTIO_DSREG_LD : MTIO_DSREG_UNL;
3515         error = cam_periph_runccb(ccb, saerror, 0, 0, softc->device_stats);
3516         softc->dsreg = MTIO_DSREG_REST;
3517         xpt_release_ccb(ccb);
3518
3519         if (error || load == 0)
3520                 softc->fileno = softc->blkno = (daddr_t) -1;
3521         else if (error == 0)
3522                 softc->fileno = softc->blkno = (daddr_t) 0;
3523         return (error);
3524 }
3525
3526 static int
3527 saerase(struct cam_periph *periph, int longerase)
3528 {
3529
3530         union   ccb *ccb;
3531         struct  sa_softc *softc;
3532         int error;
3533
3534         softc = (struct sa_softc *)periph->softc;
3535         if (softc->open_rdonly)
3536                 return (EBADF);
3537
3538         ccb = cam_periph_getccb(periph, 1);
3539
3540         scsi_erase(&ccb->csio, 1, sadone, MSG_SIMPLE_Q_TAG, FALSE, longerase,
3541             SSD_FULL_SIZE, ERASE_TIMEOUT);
3542
3543         softc->dsreg = MTIO_DSREG_ZER;
3544         error = cam_periph_runccb(ccb, saerror, 0, 0, softc->device_stats);
3545         softc->dsreg = MTIO_DSREG_REST;
3546
3547         xpt_release_ccb(ccb);
3548         return (error);
3549 }
3550
3551 #endif /* _KERNEL */
3552
3553 /*
3554  * Read tape block limits command.
3555  */
3556 void
3557 scsi_read_block_limits(struct ccb_scsiio *csio, u_int32_t retries,
3558                    void (*cbfcnp)(struct cam_periph *, union ccb *),
3559                    u_int8_t tag_action,
3560                    struct scsi_read_block_limits_data *rlimit_buf,
3561                    u_int8_t sense_len, u_int32_t timeout)
3562 {
3563         struct scsi_read_block_limits *scsi_cmd;
3564
3565         cam_fill_csio(csio, retries, cbfcnp, CAM_DIR_IN, tag_action,
3566              (u_int8_t *)rlimit_buf, sizeof(*rlimit_buf), sense_len,
3567              sizeof(*scsi_cmd), timeout);
3568
3569         scsi_cmd = (struct scsi_read_block_limits *)&csio->cdb_io.cdb_bytes;
3570         bzero(scsi_cmd, sizeof(*scsi_cmd));
3571         scsi_cmd->opcode = READ_BLOCK_LIMITS;
3572 }
3573
3574 void
3575 scsi_sa_read_write(struct ccb_scsiio *csio, u_int32_t retries,
3576                    void (*cbfcnp)(struct cam_periph *, union ccb *),
3577                    u_int8_t tag_action, int readop, int sli,
3578                    int fixed, u_int32_t length, u_int8_t *data_ptr,
3579                    u_int32_t dxfer_len, u_int8_t sense_len, u_int32_t timeout)
3580 {
3581         struct scsi_sa_rw *scsi_cmd;
3582         int read;
3583
3584         read = (readop & SCSI_RW_DIRMASK) == SCSI_RW_READ;
3585
3586         scsi_cmd = (struct scsi_sa_rw *)&csio->cdb_io.cdb_bytes;
3587         scsi_cmd->opcode = read ? SA_READ : SA_WRITE;
3588         scsi_cmd->sli_fixed = 0;
3589         if (sli && read)
3590                 scsi_cmd->sli_fixed |= SAR_SLI;
3591         if (fixed)
3592                 scsi_cmd->sli_fixed |= SARW_FIXED;
3593         scsi_ulto3b(length, scsi_cmd->length);
3594         scsi_cmd->control = 0;
3595
3596         cam_fill_csio(csio, retries, cbfcnp, (read ? CAM_DIR_IN : CAM_DIR_OUT) |
3597             ((readop & SCSI_RW_BIO) != 0 ? CAM_DATA_BIO : 0),
3598             tag_action, data_ptr, dxfer_len, sense_len,
3599             sizeof(*scsi_cmd), timeout);
3600 }
3601
3602 void
3603 scsi_load_unload(struct ccb_scsiio *csio, u_int32_t retries,
3604                  void (*cbfcnp)(struct cam_periph *, union ccb *),
3605                  u_int8_t tag_action, int immediate, int eot,
3606                  int reten, int load, u_int8_t sense_len,
3607                  u_int32_t timeout)
3608 {
3609         struct scsi_load_unload *scsi_cmd;
3610
3611         scsi_cmd = (struct scsi_load_unload *)&csio->cdb_io.cdb_bytes;
3612         bzero(scsi_cmd, sizeof(*scsi_cmd));
3613         scsi_cmd->opcode = LOAD_UNLOAD;
3614         if (immediate)
3615                 scsi_cmd->immediate = SLU_IMMED;
3616         if (eot)
3617                 scsi_cmd->eot_reten_load |= SLU_EOT;
3618         if (reten)
3619                 scsi_cmd->eot_reten_load |= SLU_RETEN;
3620         if (load)
3621                 scsi_cmd->eot_reten_load |= SLU_LOAD;
3622
3623         cam_fill_csio(csio, retries, cbfcnp, CAM_DIR_NONE, tag_action,
3624             NULL, 0, sense_len, sizeof(*scsi_cmd), timeout);
3625 }
3626
3627 void
3628 scsi_rewind(struct ccb_scsiio *csio, u_int32_t retries,
3629             void (*cbfcnp)(struct cam_periph *, union ccb *),
3630             u_int8_t tag_action, int immediate, u_int8_t sense_len,
3631             u_int32_t timeout)
3632 {
3633         struct scsi_rewind *scsi_cmd;
3634
3635         scsi_cmd = (struct scsi_rewind *)&csio->cdb_io.cdb_bytes;
3636         bzero(scsi_cmd, sizeof(*scsi_cmd));
3637         scsi_cmd->opcode = REWIND;
3638         if (immediate)
3639                 scsi_cmd->immediate = SREW_IMMED;
3640
3641         cam_fill_csio(csio, retries, cbfcnp, CAM_DIR_NONE, tag_action, NULL,
3642             0, sense_len, sizeof(*scsi_cmd), timeout);
3643 }
3644
3645 void
3646 scsi_space(struct ccb_scsiio *csio, u_int32_t retries,
3647            void (*cbfcnp)(struct cam_periph *, union ccb *),
3648            u_int8_t tag_action, scsi_space_code code,
3649            u_int32_t count, u_int8_t sense_len, u_int32_t timeout)
3650 {
3651         struct scsi_space *scsi_cmd;
3652
3653         scsi_cmd = (struct scsi_space *)&csio->cdb_io.cdb_bytes;
3654         scsi_cmd->opcode = SPACE;
3655         scsi_cmd->code = code;
3656         scsi_ulto3b(count, scsi_cmd->count);
3657         scsi_cmd->control = 0;
3658
3659         cam_fill_csio(csio, retries, cbfcnp, CAM_DIR_NONE, tag_action, NULL,
3660             0, sense_len, sizeof(*scsi_cmd), timeout);
3661 }
3662
3663 void
3664 scsi_write_filemarks(struct ccb_scsiio *csio, u_int32_t retries,
3665                      void (*cbfcnp)(struct cam_periph *, union ccb *),
3666                      u_int8_t tag_action, int immediate, int setmark,
3667                      u_int32_t num_marks, u_int8_t sense_len,
3668                      u_int32_t timeout)
3669 {
3670         struct scsi_write_filemarks *scsi_cmd;
3671
3672         scsi_cmd = (struct scsi_write_filemarks *)&csio->cdb_io.cdb_bytes;
3673         bzero(scsi_cmd, sizeof(*scsi_cmd));
3674         scsi_cmd->opcode = WRITE_FILEMARKS;
3675         if (immediate)
3676                 scsi_cmd->byte2 |= SWFMRK_IMMED;
3677         if (setmark)
3678                 scsi_cmd->byte2 |= SWFMRK_WSMK;
3679
3680         scsi_ulto3b(num_marks, scsi_cmd->num_marks);
3681
3682         cam_fill_csio(csio, retries, cbfcnp, CAM_DIR_NONE, tag_action, NULL,
3683             0, sense_len, sizeof(*scsi_cmd), timeout);
3684 }
3685
3686 /*
3687  * The reserve and release unit commands differ only by their opcodes.
3688  */
3689 void
3690 scsi_reserve_release_unit(struct ccb_scsiio *csio, u_int32_t retries,
3691                           void (*cbfcnp)(struct cam_periph *, union ccb *),
3692                           u_int8_t tag_action, int third_party,
3693                           int third_party_id, u_int8_t sense_len,
3694                           u_int32_t timeout, int reserve)
3695 {
3696         struct scsi_reserve_release_unit *scsi_cmd;
3697
3698         scsi_cmd = (struct scsi_reserve_release_unit *)&csio->cdb_io.cdb_bytes;
3699         bzero(scsi_cmd, sizeof(*scsi_cmd));
3700
3701         if (reserve)
3702                 scsi_cmd->opcode = RESERVE_UNIT;
3703         else
3704                 scsi_cmd->opcode = RELEASE_UNIT;
3705
3706         if (third_party) {
3707                 scsi_cmd->lun_thirdparty |= SRRU_3RD_PARTY;
3708                 scsi_cmd->lun_thirdparty |=
3709                         ((third_party_id << SRRU_3RD_SHAMT) & SRRU_3RD_MASK);
3710         }
3711
3712         cam_fill_csio(csio, retries, cbfcnp, CAM_DIR_NONE, tag_action, NULL,
3713             0, sense_len, sizeof(*scsi_cmd), timeout);
3714 }
3715
3716 void
3717 scsi_erase(struct ccb_scsiio *csio, u_int32_t retries,
3718            void (*cbfcnp)(struct cam_periph *, union ccb *),
3719            u_int8_t tag_action, int immediate, int long_erase,
3720            u_int8_t sense_len, u_int32_t timeout)
3721 {
3722         struct scsi_erase *scsi_cmd;
3723
3724         scsi_cmd = (struct scsi_erase *)&csio->cdb_io.cdb_bytes;
3725         bzero(scsi_cmd, sizeof(*scsi_cmd));
3726
3727         scsi_cmd->opcode = ERASE;
3728
3729         if (immediate)
3730                 scsi_cmd->lun_imm_long |= SE_IMMED;
3731
3732         if (long_erase)
3733                 scsi_cmd->lun_imm_long |= SE_LONG;
3734
3735         cam_fill_csio(csio, retries, cbfcnp, CAM_DIR_NONE, tag_action, NULL,
3736             0, sense_len, sizeof(*scsi_cmd), timeout);
3737 }
3738
3739 /*
3740  * Read Tape Position command.
3741  */
3742 void
3743 scsi_read_position(struct ccb_scsiio *csio, u_int32_t retries,
3744                    void (*cbfcnp)(struct cam_periph *, union ccb *),
3745                    u_int8_t tag_action, int hardsoft,
3746                    struct scsi_tape_position_data *sbp,
3747                    u_int8_t sense_len, u_int32_t timeout)
3748 {
3749         struct scsi_tape_read_position *scmd;
3750
3751         cam_fill_csio(csio, retries, cbfcnp, CAM_DIR_IN, tag_action,
3752             (u_int8_t *)sbp, sizeof (*sbp), sense_len, sizeof(*scmd), timeout);
3753         scmd = (struct scsi_tape_read_position *)&csio->cdb_io.cdb_bytes;
3754         bzero(scmd, sizeof(*scmd));
3755         scmd->opcode = READ_POSITION;
3756         scmd->byte1 = hardsoft;
3757 }
3758
3759 /*
3760  * Set Tape Position command.
3761  */
3762 void
3763 scsi_set_position(struct ccb_scsiio *csio, u_int32_t retries,
3764                    void (*cbfcnp)(struct cam_periph *, union ccb *),
3765                    u_int8_t tag_action, int hardsoft, u_int32_t blkno,
3766                    u_int8_t sense_len, u_int32_t timeout)
3767 {
3768         struct scsi_tape_locate *scmd;
3769
3770         cam_fill_csio(csio, retries, cbfcnp, CAM_DIR_NONE, tag_action,
3771             (u_int8_t *)NULL, 0, sense_len, sizeof(*scmd), timeout);
3772         scmd = (struct scsi_tape_locate *)&csio->cdb_io.cdb_bytes;
3773         bzero(scmd, sizeof(*scmd));
3774         scmd->opcode = LOCATE;
3775         if (hardsoft)
3776                 scmd->byte1 |= SA_SPOS_BT;
3777         scsi_ulto4b(blkno, scmd->blkaddr);
3778 }