sys/bus/cam/scsi/scsi_pt.c

   1 /*
   2  * Implementation of SCSI Processor Target Peripheral driver for CAM.
   3  *
   4  * Copyright (c) 1998 Justin T. Gibbs.
   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  * $FreeBSD: src/sys/cam/scsi/scsi_pt.c,v 1.17 2000/01/17 06:27:37 mjacob Exp $
  29  * $DragonFly: src/sys/bus/cam/scsi/scsi_pt.c,v 1.11 2004/05/19 22:52:38 dillon Exp $
  30  */
  31
  32 #include <sys/param.h>
  33 #include <sys/queue.h>
  34 #include <sys/systm.h>
  35 #include <sys/kernel.h>
  36 #include <sys/types.h>
  37 #include <sys/buf.h>
  38 #include <sys/devicestat.h>
  39 #include <sys/malloc.h>
  40 #include <sys/conf.h>
  41 #include <sys/ptio.h>
  42 #include <sys/buf2.h>
  43
  44 #include "../cam.h"
  45 #include "../cam_ccb.h"
  46 #include "../cam_extend.h"
  47 #include "../cam_periph.h"
  48 #include "../cam_xpt_periph.h"
  49 #include "../cam_debug.h"
  50
  51 #include "scsi_all.h"
  52 #include "scsi_message.h"
  53 #include "scsi_pt.h"
  54
  55 #include "opt_pt.h"
  56
  57 typedef enum {
  58         PT_STATE_PROBE,
  59         PT_STATE_NORMAL
  60 } pt_state;
  61
  62 typedef enum {
  63         PT_FLAG_NONE            = 0x00,
  64         PT_FLAG_OPEN            = 0x01,
  65         PT_FLAG_DEVICE_INVALID  = 0x02,
  66         PT_FLAG_RETRY_UA        = 0x04
  67 } pt_flags;
  68
  69 typedef enum {
  70         PT_CCB_BUFFER_IO        = 0x01,
  71         PT_CCB_WAITING          = 0x02,
  72         PT_CCB_RETRY_UA         = 0x04,
  73         PT_CCB_BUFFER_IO_UA     = PT_CCB_BUFFER_IO|PT_CCB_RETRY_UA
  74 } pt_ccb_state;
  75
  76 /* Offsets into our private area for storing information */
  77 #define ccb_state       ppriv_field0
  78 #define ccb_bp          ppriv_ptr1
  79
  80 struct pt_softc {
  81         struct   buf_queue_head buf_queue;
  82         struct   devstat device_stats;
  83         LIST_HEAD(, ccb_hdr) pending_ccbs;
  84         pt_state state;
  85         pt_flags flags;
  86         union    ccb saved_ccb;
  87         int      io_timeout;
  88         dev_t    dev;
  89 };
  90
  91 static  d_open_t        ptopen;
  92 static  d_close_t       ptclose;
  93 static  d_strategy_t    ptstrategy;
  94 static  periph_init_t   ptinit;
  95 static  void            ptasync(void *callback_arg, u_int32_t code,
  96                                 struct cam_path *path, void *arg);
  97 static  periph_ctor_t   ptctor;
  98 static  periph_oninv_t  ptoninvalidate;
  99 static  periph_dtor_t   ptdtor;
 100 static  periph_start_t  ptstart;
 101 static  void            ptdone(struct cam_periph *periph,
 102                                union ccb *done_ccb);
 103 static  d_ioctl_t       ptioctl;
 104 static  int             pterror(union ccb *ccb, u_int32_t cam_flags,
 105                                 u_int32_t sense_flags);
 106
 107 void    scsi_send_receive(struct ccb_scsiio *csio, u_int32_t retries,
 108                           void (*cbfcnp)(struct cam_periph *, union ccb *),
 109                           u_int tag_action, int readop, u_int byte2,
 110                           u_int32_t xfer_len, u_int8_t *data_ptr,
 111                           u_int8_t sense_len, u_int32_t timeout);
 112
 113 static struct periph_driver ptdriver =
 114 {
 115         ptinit, "pt",
 116         TAILQ_HEAD_INITIALIZER(ptdriver.units), /* generation */ 0
 117 };
 118
 119 DATA_SET(periphdriver_set, ptdriver);
 120
 121 #define PT_CDEV_MAJOR 61
 122
 123 static struct cdevsw pt_cdevsw = {
 124         /* name */      "pt",
 125         /* maj */       PT_CDEV_MAJOR,
 126         /* flags */     0,
 127         /* port */      NULL,
 128         /* clone */     NULL,
 129
 130         /* open */      ptopen,
 131         /* close */     ptclose,
 132         /* read */      physread,
 133         /* write */     physwrite,
 134         /* ioctl */     ptioctl,
 135         /* poll */      nopoll,
 136         /* mmap */      nommap,
 137         /* strategy */  ptstrategy,
 138         /* dump */      nodump,
 139         /* psize */     nopsize
 140 };
 141
 142 static struct extend_array *ptperiphs;
 143
 144 #ifndef SCSI_PT_DEFAULT_TIMEOUT
 145 #define SCSI_PT_DEFAULT_TIMEOUT         60
 146 #endif
 147
 148 static int
 149 ptopen(dev_t dev, int flags, int fmt, struct thread *td)
 150 {
 151         struct cam_periph *periph;
 152         struct pt_softc *softc;
 153         int unit;
 154         int error;
 155         int s;
 156
 157         unit = minor(dev);
 158         periph = cam_extend_get(ptperiphs, unit);
 159         if (periph == NULL)
 160                 return (ENXIO);
 161
 162         softc = (struct pt_softc *)periph->softc;
 163
 164         s = splsoftcam();
 165         if (softc->flags & PT_FLAG_DEVICE_INVALID) {
 166                 splx(s);
 167                 return(ENXIO);
 168         }
 169
 170         CAM_DEBUG(periph->path, CAM_DEBUG_TRACE,
 171             ("ptopen: dev=%s (unit %d)\n", devtoname(dev), unit));
 172
 173         if ((error = cam_periph_lock(periph, PCATCH)) != 0) {
 174                 splx(s);
 175                 return (error); /* error code from tsleep */
 176         }
 177
 178         splx(s);
 179
 180         if ((softc->flags & PT_FLAG_OPEN) == 0) {
 181                 if (cam_periph_acquire(periph) != CAM_REQ_CMP)
 182                         error = ENXIO;
 183                 else
 184                         softc->flags |= PT_FLAG_OPEN;
 185         } else
 186                 error = EBUSY;
 187
 188         cam_periph_unlock(periph);
 189         return (error);
 190 }
 191
 192 static int
 193 ptclose(dev_t dev, int flag, int fmt, struct thread *td)
 194 {
 195         struct  cam_periph *periph;
 196         struct  pt_softc *softc;
 197         int     unit;
 198         int     error;
 199
 200         unit = minor(dev);
 201         periph = cam_extend_get(ptperiphs, unit);
 202         if (periph == NULL)
 203                 return (ENXIO);
 204
 205         softc = (struct pt_softc *)periph->softc;
 206
 207         if ((error = cam_periph_lock(periph, 0)) != 0)
 208                 return (error); /* error code from tsleep */
 209
 210         softc->flags &= ~PT_FLAG_OPEN;
 211         cam_periph_unlock(periph);
 212         cam_periph_release(periph);
 213         return (0);
 214 }
 215
 216 /*
 217  * Actually translate the requested transfer into one the physical driver
 218  * can understand.  The transfer is described by a buf and will include
 219  * only one physical transfer.
 220  */
 221 static void
 222 ptstrategy(struct buf *bp)
 223 {
 224         struct cam_periph *periph;
 225         struct pt_softc *softc;
 226         u_int  unit;
 227         int    s;
 228
 229         unit = minor(bp->b_dev);
 230         periph = cam_extend_get(ptperiphs, unit);
 231         if (periph == NULL) {
 232                 bp->b_error = ENXIO;
 233                 goto bad;
 234         }
 235         softc = (struct pt_softc *)periph->softc;
 236
 237         /*
 238          * Mask interrupts so that the pack cannot be invalidated until
 239          * after we are in the queue.  Otherwise, we might not properly
 240          * clean up one of the buffers.
 241          */
 242         s = splbio();
 243
 244         /*
 245          * If the device has been made invalid, error out
 246          */
 247         if ((softc->flags & PT_FLAG_DEVICE_INVALID)) {
 248                 splx(s);
 249                 bp->b_error = ENXIO;
 250                 goto bad;
 251         }
 252
 253         /*
 254          * Place it in the queue of disk activities for this disk
 255          */
 256         bufq_insert_tail(&softc->buf_queue, bp);
 257
 258         splx(s);
 259
 260         /*
 261          * Schedule ourselves for performing the work.
 262          */
 263         xpt_schedule(periph, /* XXX priority */1);
 264
 265         return;
 266 bad:
 267         bp->b_flags |= B_ERROR;
 268
 269         /*
 270          * Correctly set the buf to indicate a completed xfer
 271          */
 272         bp->b_resid = bp->b_bcount;
 273         biodone(bp);
 274 }
 275
 276 static void
 277 ptinit(void)
 278 {
 279         cam_status status;
 280         struct cam_path *path;
 281
 282         /*
 283          * Create our extend array for storing the devices we attach to.
 284          */
 285         ptperiphs = cam_extend_new();
 286         if (ptperiphs == NULL) {
 287                 printf("pt: Failed to alloc extend array!\n");
 288                 return;
 289         }
 290
 291         /*
 292          * Install a global async callback.  This callback will
 293          * receive async callbacks like "new device found".
 294          */
 295         status = xpt_create_path(&path, /*periph*/NULL, CAM_XPT_PATH_ID,
 296                                  CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD);
 297
 298         if (status == CAM_REQ_CMP) {
 299                 struct ccb_setasync csa;
 300
 301                 xpt_setup_ccb(&csa.ccb_h, path, /*priority*/5);
 302                 csa.ccb_h.func_code = XPT_SASYNC_CB;
 303                 csa.event_enable = AC_FOUND_DEVICE;
 304                 csa.callback = ptasync;
 305                 csa.callback_arg = NULL;
 306                 xpt_action((union ccb *)&csa);
 307                 status = csa.ccb_h.status;
 308                 xpt_free_path(path);
 309         }
 310
 311         if (status != CAM_REQ_CMP) {
 312                 printf("pt: Failed to attach master async callback "
 313                        "due to status 0x%x!\n", status);
 314         }
 315 }
 316
 317 static cam_status
 318 ptctor(struct cam_periph *periph, void *arg)
 319 {
 320         struct pt_softc *softc;
 321         struct ccb_setasync csa;
 322         struct ccb_getdev *cgd;
 323
 324         cgd = (struct ccb_getdev *)arg;
 325         if (periph == NULL) {
 326                 printf("ptregister: periph was NULL!!\n");
 327                 return(CAM_REQ_CMP_ERR);
 328         }
 329
 330         if (cgd == NULL) {
 331                 printf("ptregister: no getdev CCB, can't register device\n");
 332                 return(CAM_REQ_CMP_ERR);
 333         }
 334
 335         softc = malloc(sizeof(*softc), M_DEVBUF, M_INTWAIT | M_ZERO);
 336         LIST_INIT(&softc->pending_ccbs);
 337         softc->state = PT_STATE_NORMAL;
 338         bufq_init(&softc->buf_queue);
 339
 340         softc->io_timeout = SCSI_PT_DEFAULT_TIMEOUT * 1000;
 341
 342         periph->softc = softc;
 343
 344         cam_extend_set(ptperiphs, periph->unit_number, periph);
 345
 346         devstat_add_entry(&softc->device_stats, "pt",
 347                           periph->unit_number, 0,
 348                           DEVSTAT_NO_BLOCKSIZE,
 349                           SID_TYPE(&cgd->inq_data) | DEVSTAT_TYPE_IF_SCSI,
 350                           DEVSTAT_PRIORITY_OTHER);
 351
 352         cdevsw_add(&pt_cdevsw, -1, periph->unit_number);
 353         make_dev(&pt_cdevsw, periph->unit_number, UID_ROOT,
 354                   GID_OPERATOR, 0600, "%s%d", periph->periph_name,
 355                   periph->unit_number);
 356         /*
 357          * Add async callbacks for bus reset and
 358          * bus device reset calls.  I don't bother
 359          * checking if this fails as, in most cases,
 360          * the system will function just fine without
 361          * them and the only alternative would be to
 362          * not attach the device on failure.
 363          */
 364         xpt_setup_ccb(&csa.ccb_h, periph->path, /*priority*/5);
 365         csa.ccb_h.func_code = XPT_SASYNC_CB;
 366         csa.event_enable = AC_SENT_BDR | AC_BUS_RESET | AC_LOST_DEVICE;
 367         csa.callback = ptasync;
 368         csa.callback_arg = periph;
 369         xpt_action((union ccb *)&csa);
 370
 371         /* Tell the user we've attached to the device */
 372         xpt_announce_periph(periph, NULL);
 373
 374         return(CAM_REQ_CMP);
 375 }
 376
 377 static void
 378 ptoninvalidate(struct cam_periph *periph)
 379 {
 380         int s;
 381         struct pt_softc *softc;
 382         struct buf *q_bp;
 383         struct ccb_setasync csa;
 384
 385         softc = (struct pt_softc *)periph->softc;
 386
 387         /*
 388          * De-register any async callbacks.
 389          */
 390         xpt_setup_ccb(&csa.ccb_h, periph->path,
 391                       /* priority */ 5);
 392         csa.ccb_h.func_code = XPT_SASYNC_CB;
 393         csa.event_enable = 0;
 394         csa.callback = ptasync;
 395         csa.callback_arg = periph;
 396         xpt_action((union ccb *)&csa);
 397
 398         softc->flags |= PT_FLAG_DEVICE_INVALID;
 399
 400         /*
 401          * Although the oninvalidate() routines are always called at
 402          * splsoftcam, we need to be at splbio() here to keep the buffer
 403          * queue from being modified while we traverse it.
 404          */
 405         s = splbio();
 406
 407         /*
 408          * Return all queued I/O with ENXIO.
 409          * XXX Handle any transactions queued to the card
 410          *     with XPT_ABORT_CCB.
 411          */
 412         while ((q_bp = bufq_first(&softc->buf_queue)) != NULL){
 413                 bufq_remove(&softc->buf_queue, q_bp);
 414                 q_bp->b_resid = q_bp->b_bcount;
 415                 q_bp->b_error = ENXIO;
 416                 q_bp->b_flags |= B_ERROR;
 417                 biodone(q_bp);
 418         }
 419
 420         splx(s);
 421
 422         xpt_print_path(periph->path);
 423         printf("lost device\n");
 424 }
 425
 426 static void
 427 ptdtor(struct cam_periph *periph)
 428 {
 429         struct pt_softc *softc;
 430
 431         softc = (struct pt_softc *)periph->softc;
 432
 433         devstat_remove_entry(&softc->device_stats);
 434
 435         cam_extend_release(ptperiphs, periph->unit_number);
 436         xpt_print_path(periph->path);
 437         printf("removing device entry\n");
 438         cdevsw_remove(&pt_cdevsw, -1, periph->unit_number);
 439         free(softc, M_DEVBUF);
 440 }
 441
 442 static void
 443 ptasync(void *callback_arg, u_int32_t code, struct cam_path *path, void *arg)
 444 {
 445         struct cam_periph *periph;
 446
 447         periph = (struct cam_periph *)callback_arg;
 448         switch (code) {
 449         case AC_FOUND_DEVICE:
 450         {
 451                 struct ccb_getdev *cgd;
 452                 cam_status status;
 453
 454                 cgd = (struct ccb_getdev *)arg;
 455
 456                 if (SID_TYPE(&cgd->inq_data) != T_PROCESSOR)
 457                         break;
 458
 459                 /*
 460                  * Allocate a peripheral instance for
 461                  * this device and start the probe
 462                  * process.
 463                  */
 464                 status = cam_periph_alloc(ptctor, ptoninvalidate, ptdtor,
 465                                           ptstart, "pt", CAM_PERIPH_BIO,
 466                                           cgd->ccb_h.path, ptasync,
 467                                           AC_FOUND_DEVICE, cgd);
 468
 469                 if (status != CAM_REQ_CMP
 470                  && status != CAM_REQ_INPROG)
 471                         printf("ptasync: Unable to attach to new device "
 472                                 "due to status 0x%x\n", status);
 473                 break;
 474         }
 475         case AC_SENT_BDR:
 476         case AC_BUS_RESET:
 477         {
 478                 struct pt_softc *softc;
 479                 struct ccb_hdr *ccbh;
 480                 int s;
 481
 482                 softc = (struct pt_softc *)periph->softc;
 483                 s = splsoftcam();
 484                 /*
 485                  * Don't fail on the expected unit attention
 486                  * that will occur.
 487                  */
 488                 softc->flags |= PT_FLAG_RETRY_UA;
 489                 for (ccbh = LIST_FIRST(&softc->pending_ccbs);
 490                      ccbh != NULL; ccbh = LIST_NEXT(ccbh, periph_links.le))
 491                         ccbh->ccb_state |= PT_CCB_RETRY_UA;
 492                 splx(s);
 493                 /* FALLTHROUGH */
 494         }
 495         default:
 496                 cam_periph_async(periph, code, path, arg);
 497                 break;
 498         }
 499 }
 500
 501 static void
 502 ptstart(struct cam_periph *periph, union ccb *start_ccb)
 503 {
 504         struct pt_softc *softc;
 505         struct buf *bp;
 506         int s;
 507
 508         softc = (struct pt_softc *)periph->softc;
 509
 510         /*
 511          * See if there is a buf with work for us to do..
 512          */
 513         s = splbio();
 514         bp = bufq_first(&softc->buf_queue);
 515         if (periph->immediate_priority <= periph->pinfo.priority) {
 516                 CAM_DEBUG_PRINT(CAM_DEBUG_SUBTRACE,
 517                                 ("queuing for immediate ccb\n"));
 518                 start_ccb->ccb_h.ccb_state = PT_CCB_WAITING;
 519                 SLIST_INSERT_HEAD(&periph->ccb_list, &start_ccb->ccb_h,
 520                                   periph_links.sle);
 521                 periph->immediate_priority = CAM_PRIORITY_NONE;
 522                 splx(s);
 523                 wakeup(&periph->ccb_list);
 524         } else if (bp == NULL) {
 525                 splx(s);
 526                 xpt_release_ccb(start_ccb);
 527         } else {
 528                 int oldspl;
 529
 530                 bufq_remove(&softc->buf_queue, bp);
 531
 532                 devstat_start_transaction(&softc->device_stats);
 533
 534                 scsi_send_receive(&start_ccb->csio,
 535                                   /*retries*/4,
 536                                   ptdone,
 537                                   MSG_SIMPLE_Q_TAG,
 538                                   bp->b_flags & B_READ,
 539                                   /*byte2*/0,
 540                                   bp->b_bcount,
 541                                   bp->b_data,
 542                                   /*sense_len*/SSD_FULL_SIZE,
 543                                   /*timeout*/softc->io_timeout);
 544
 545                 start_ccb->ccb_h.ccb_state = PT_CCB_BUFFER_IO;
 546
 547                 /*
 548                  * Block out any asyncronous callbacks
 549                  * while we touch the pending ccb list.
 550                  */
 551                 oldspl = splcam();
 552                 LIST_INSERT_HEAD(&softc->pending_ccbs, &start_ccb->ccb_h,
 553                                  periph_links.le);
 554                 splx(oldspl);
 555
 556                 start_ccb->ccb_h.ccb_bp = bp;
 557                 bp = bufq_first(&softc->buf_queue);
 558                 splx(s);
 559
 560                 xpt_action(start_ccb);
 561
 562                 if (bp != NULL) {
 563                         /* Have more work to do, so ensure we stay scheduled */
 564                         xpt_schedule(periph, /* XXX priority */1);
 565                 }
 566         }
 567 }
 568
 569 static void
 570 ptdone(struct cam_periph *periph, union ccb *done_ccb)
 571 {
 572         struct pt_softc *softc;
 573         struct ccb_scsiio *csio;
 574
 575         softc = (struct pt_softc *)periph->softc;
 576         csio = &done_ccb->csio;
 577         switch (csio->ccb_h.ccb_state) {
 578         case PT_CCB_BUFFER_IO:
 579         case PT_CCB_BUFFER_IO_UA:
 580         {
 581                 struct buf *bp;
 582                 int    oldspl;
 583
 584                 bp = (struct buf *)done_ccb->ccb_h.ccb_bp;
 585                 if ((done_ccb->ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_CMP) {
 586                         int error;
 587                         int s;
 588                         int sf;
 589
 590                         if ((csio->ccb_h.ccb_state & PT_CCB_RETRY_UA) != 0)
 591                                 sf = SF_RETRY_UA;
 592                         else
 593                                 sf = 0;
 594
 595                         sf |= SF_RETRY_SELTO;
 596
 597                         if ((error = pterror(done_ccb, 0, sf)) == ERESTART) {
 598                                 /*
 599                                  * A retry was scheuled, so
 600                                  * just return.
 601                                  */
 602                                 return;
 603                         }
 604                         if (error != 0) {
 605                                 struct buf *q_bp;
 606
 607                                 s = splbio();
 608
 609                                 if (error == ENXIO) {
 610                                         /*
 611                                          * Catastrophic error.  Mark our device
 612                                          * as invalid.
 613                                          */
 614                                         xpt_print_path(periph->path);
 615                                         printf("Invalidating device\n");
 616                                         softc->flags |= PT_FLAG_DEVICE_INVALID;
 617                                 }
 618
 619                                 /*
 620                                  * return all queued I/O with EIO, so that
 621                                  * the client can retry these I/Os in the
 622                                  * proper order should it attempt to recover.
 623                                  */
 624                                 while ((q_bp = bufq_first(&softc->buf_queue))
 625                                         != NULL) {
 626                                         bufq_remove(&softc->buf_queue, q_bp);
 627                                         q_bp->b_resid = q_bp->b_bcount;
 628                                         q_bp->b_error = EIO;
 629                                         q_bp->b_flags |= B_ERROR;
 630                                         biodone(q_bp);
 631                                 }
 632                                 splx(s);
 633                                 bp->b_error = error;
 634                                 bp->b_resid = bp->b_bcount;
 635                                 bp->b_flags |= B_ERROR;
 636                         } else {
 637                                 bp->b_resid = csio->resid;
 638                                 bp->b_error = 0;
 639                                 if (bp->b_resid != 0) {
 640                                         /* Short transfer ??? */
 641                                         bp->b_flags |= B_ERROR;
 642                                 }
 643                         }
 644                         if ((done_ccb->ccb_h.status & CAM_DEV_QFRZN) != 0)
 645                                 cam_release_devq(done_ccb->ccb_h.path,
 646                                                  /*relsim_flags*/0,
 647                                                  /*reduction*/0,
 648                                                  /*timeout*/0,
 649                                                  /*getcount_only*/0);
 650                 } else {
 651                         bp->b_resid = csio->resid;
 652                         if (bp->b_resid != 0)
 653                                 bp->b_flags |= B_ERROR;
 654                 }
 655
 656                 /*
 657                  * Block out any asyncronous callbacks
 658                  * while we touch the pending ccb list.
 659                  */
 660                 oldspl = splcam();
 661                 LIST_REMOVE(&done_ccb->ccb_h, periph_links.le);
 662                 splx(oldspl);
 663
 664                 devstat_end_transaction_buf(&softc->device_stats, bp);
 665                 biodone(bp);
 666                 break;
 667         }
 668         case PT_CCB_WAITING:
 669                 /* Caller will release the CCB */
 670                 wakeup(&done_ccb->ccb_h.cbfcnp);
 671                 return;
 672         }
 673         xpt_release_ccb(done_ccb);
 674 }
 675
 676 static int
 677 pterror(union ccb *ccb, u_int32_t cam_flags, u_int32_t sense_flags)
 678 {
 679         struct pt_softc   *softc;
 680         struct cam_periph *periph;
 681
 682         periph = xpt_path_periph(ccb->ccb_h.path);
 683         softc = (struct pt_softc *)periph->softc;
 684
 685         return(cam_periph_error(ccb, cam_flags, sense_flags,
 686                                 &softc->saved_ccb));
 687 }
 688
 689 static int
 690 ptioctl(dev_t dev, u_long cmd, caddr_t addr, int flag, struct thread *td)
 691 {
 692         struct cam_periph *periph;
 693         struct pt_softc *softc;
 694         int unit;
 695         int error;
 696
 697         unit = minor(dev);
 698         periph = cam_extend_get(ptperiphs, unit);
 699
 700         if (periph == NULL)
 701                 return(ENXIO);
 702
 703         softc = (struct pt_softc *)periph->softc;
 704
 705         if ((error = cam_periph_lock(periph, PCATCH)) != 0) {
 706                 return (error); /* error code from tsleep */
 707         }
 708
 709         switch(cmd) {
 710         case PTIOCGETTIMEOUT:
 711                 if (softc->io_timeout >= 1000)
 712                         *(int *)addr = softc->io_timeout / 1000;
 713                 else
 714                         *(int *)addr = 0;
 715                 break;
 716         case PTIOCSETTIMEOUT:
 717         {
 718                 int s;
 719
 720                 if (*(int *)addr < 1) {
 721                         error = EINVAL;
 722                         break;
 723                 }
 724
 725                 s = splsoftcam();
 726                 softc->io_timeout = *(int *)addr * 1000;
 727                 splx(s);
 728
 729                 break;
 730         }
 731         default:
 732                 error = cam_periph_ioctl(periph, cmd, addr, pterror);
 733                 break;
 734         }
 735
 736         cam_periph_unlock(periph);
 737
 738         return(error);
 739 }
 740
 741 void
 742 scsi_send_receive(struct ccb_scsiio *csio, u_int32_t retries,
 743                   void (*cbfcnp)(struct cam_periph *, union ccb *),
 744                   u_int tag_action, int readop, u_int byte2,
 745                   u_int32_t xfer_len, u_int8_t *data_ptr, u_int8_t sense_len,
 746                   u_int32_t timeout)
 747 {
 748         struct scsi_send_receive *scsi_cmd;
 749
 750         scsi_cmd = (struct scsi_send_receive *)&csio->cdb_io.cdb_bytes;
 751         scsi_cmd->opcode = readop ? RECEIVE : SEND;
 752         scsi_cmd->byte2 = byte2;
 753         scsi_ulto3b(xfer_len, scsi_cmd->xfer_len);
 754         scsi_cmd->control = 0;
 755
 756         cam_fill_csio(csio,
 757                       retries,
 758                       cbfcnp,
 759                       /*flags*/readop ? CAM_DIR_IN : CAM_DIR_OUT,
 760                       tag_action,
 761                       data_ptr,
 762                       xfer_len,
 763                       sense_len,
 764                       sizeof(*scsi_cmd),
 765                       timeout);
 766 }