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