sys/bus/cam/scsi/scsi_pass.c

   1 /*
   2  * Copyright (c) 1997, 1998, 2000 Justin T. Gibbs.
   3  * Copyright (c) 1997, 1998, 1999 Kenneth D. Merry.
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions, and the following disclaimer,
  11  *    without modification, immediately at the beginning of the file.
  12  * 2. The name of the author may not be used to endorse or promote products
  13  *    derived from this software without specific prior written permission.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  18  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
  19  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  25  * SUCH DAMAGE.
  26  *
  27  * $FreeBSD: src/sys/cam/scsi/scsi_pass.c,v 1.19 2000/01/17 06:27:37 mjacob Exp $
  28  * $DragonFly: src/sys/bus/cam/scsi/scsi_pass.c,v 1.27 2008/05/18 20:30:20 pavalos Exp $
  29  */
  30
  31 #include <sys/param.h>
  32 #include <sys/systm.h>
  33 #include <sys/kernel.h>
  34 #include <sys/types.h>
  35 #include <sys/buf.h>
  36 #include <sys/malloc.h>
  37 #include <sys/fcntl.h>
  38 #include <sys/stat.h>
  39 #include <sys/conf.h>
  40 #include <sys/errno.h>
  41 #include <sys/devicestat.h>
  42 #include <sys/buf2.h>
  43 #include <sys/thread2.h>
  44
  45 #include "../cam.h"
  46 #include "../cam_ccb.h"
  47 #include "../cam_extend.h"
  48 #include "../cam_periph.h"
  49 #include "../cam_queue.h"
  50 #include "../cam_xpt_periph.h"
  51 #include "../cam_debug.h"
  52 #include "../cam_sim.h"
  53
  54 #include "scsi_all.h"
  55 #include "scsi_message.h"
  56 #include "scsi_da.h"
  57 #include "scsi_pass.h"
  58
  59 typedef enum {
  60         PASS_FLAG_OPEN                  = 0x01,
  61         PASS_FLAG_LOCKED                = 0x02,
  62         PASS_FLAG_INVALID               = 0x04
  63 } pass_flags;
  64
  65 typedef enum {
  66         PASS_STATE_NORMAL
  67 } pass_state;
  68
  69 typedef enum {
  70         PASS_CCB_BUFFER_IO,
  71         PASS_CCB_WAITING
  72 } pass_ccb_types;
  73
  74 #define ccb_type        ppriv_field0
  75 #define ccb_bio         ppriv_ptr1
  76
  77 struct pass_softc {
  78         pass_state      state;
  79         pass_flags      flags;
  80         u_int8_t        pd_type;
  81         union ccb       saved_ccb;
  82         struct devstat  device_stats;
  83 };
  84
  85 #define PASS_CDEV_MAJOR 31
  86
  87 static  d_open_t        passopen;
  88 static  d_close_t       passclose;
  89 static  d_ioctl_t       passioctl;
  90
  91 static  periph_init_t   passinit;
  92 static  periph_ctor_t   passregister;
  93 static  periph_oninv_t  passoninvalidate;
  94 static  periph_dtor_t   passcleanup;
  95 static  periph_start_t  passstart;
  96 static  void            passasync(void *callback_arg, u_int32_t code,
  97                                   struct cam_path *path, void *arg);
  98 static  void            passdone(struct cam_periph *periph,
  99                                  union ccb *done_ccb);
 100 static  int             passerror(union ccb *ccb, u_int32_t cam_flags,
 101                                   u_int32_t sense_flags);
 102 static  int             passsendccb(struct cam_periph *periph, union ccb *ccb,
 103                                     union ccb *inccb);
 104
 105 static struct periph_driver passdriver =
 106 {
 107         passinit, "pass",
 108         TAILQ_HEAD_INITIALIZER(passdriver.units), /* generation */ 0
 109 };
 110
 111 PERIPHDRIVER_DECLARE(pass, passdriver);
 112
 113 static struct dev_ops pass_ops = {
 114         { "pass", PASS_CDEV_MAJOR, 0 },
 115         .d_open =       passopen,
 116         .d_close =      passclose,
 117         .d_read =       noread,
 118         .d_write =      nowrite,
 119         .d_ioctl =      passioctl,
 120         .d_strategy =   nostrategy,
 121 };
 122
 123 static struct extend_array *passperiphs;
 124
 125 static void
 126 passinit(void)
 127 {
 128         cam_status status;
 129
 130         /*
 131          * Create our extend array for storing the devices we attach to.
 132          */
 133         passperiphs = cam_extend_new();
 134         if (passperiphs == NULL) {
 135                 kprintf("passm: Failed to alloc extend array!\n");
 136                 return;
 137         }
 138
 139         /*
 140          * Install a global async callback.  This callback will
 141          * receive async callbacks like "new device found".
 142          */
 143         status = xpt_register_async(AC_FOUND_DEVICE, passasync, NULL, NULL);
 144
 145         if (status != CAM_REQ_CMP) {
 146                 kprintf("pass: Failed to attach master async callback "
 147                        "due to status 0x%x!\n", status);
 148         }
 149
 150 }
 151
 152 static void
 153 passoninvalidate(struct cam_periph *periph)
 154 {
 155         struct pass_softc *softc;
 156
 157         softc = (struct pass_softc *)periph->softc;
 158
 159         /*
 160          * De-register any async callbacks.
 161          */
 162         xpt_register_async(0, passasync, periph, periph->path);
 163
 164         softc->flags |= PASS_FLAG_INVALID;
 165
 166         if (bootverbose) {
 167                 xpt_print(periph->path, "lost device\n");
 168         }
 169
 170 }
 171
 172 static void
 173 passcleanup(struct cam_periph *periph)
 174 {
 175         struct pass_softc *softc;
 176
 177         softc = (struct pass_softc *)periph->softc;
 178
 179         devstat_remove_entry(&softc->device_stats);
 180
 181         cam_extend_release(passperiphs, periph->unit_number);
 182
 183         if (bootverbose) {
 184                 xpt_print(periph->path, "removing device entry\n");
 185         }
 186         dev_ops_remove(&pass_ops, -1, periph->unit_number);
 187         kfree(softc, M_DEVBUF);
 188 }
 189
 190 static void
 191 passasync(void *callback_arg, u_int32_t code,
 192           struct cam_path *path, void *arg)
 193 {
 194         struct cam_periph *periph;
 195         struct cam_sim *sim;
 196
 197         periph = (struct cam_periph *)callback_arg;
 198
 199         switch (code) {
 200         case AC_FOUND_DEVICE:
 201         {
 202                 struct ccb_getdev *cgd;
 203                 cam_status status;
 204
 205                 cgd = (struct ccb_getdev *)arg;
 206                 if (cgd == NULL)
 207                         break;
 208
 209                 /*
 210                  * Allocate a peripheral instance for
 211                  * this device and start the probe
 212                  * process.
 213                  */
 214                 sim = xpt_path_sim(cgd->ccb_h.path);
 215                 status = cam_periph_alloc(passregister, passoninvalidate,
 216                                           passcleanup, passstart, "pass",
 217                                           CAM_PERIPH_BIO, cgd->ccb_h.path,
 218                                           passasync, AC_FOUND_DEVICE, cgd);
 219
 220                 if (status != CAM_REQ_CMP
 221                  && status != CAM_REQ_INPROG) {
 222                         const struct cam_status_entry *entry;
 223
 224                         entry = cam_fetch_status_entry(status);
 225
 226                         kprintf("passasync: Unable to attach new device "
 227                                 "due to status %#x: %s\n", status, entry ?
 228                                 entry->status_text : "Unknown");
 229                 }
 230
 231                 break;
 232         }
 233         default:
 234                 cam_periph_async(periph, code, path, arg);
 235                 break;
 236         }
 237 }
 238
 239 static cam_status
 240 passregister(struct cam_periph *periph, void *arg)
 241 {
 242         struct pass_softc *softc;
 243         struct ccb_getdev *cgd;
 244         int    no_tags;
 245
 246         cgd = (struct ccb_getdev *)arg;
 247         if (periph == NULL) {
 248                 kprintf("passregister: periph was NULL!!\n");
 249                 return(CAM_REQ_CMP_ERR);
 250         }
 251
 252         if (cgd == NULL) {
 253                 kprintf("passregister: no getdev CCB, can't register device\n");
 254                 return(CAM_REQ_CMP_ERR);
 255         }
 256
 257         softc = kmalloc(sizeof(*softc), M_DEVBUF, M_INTWAIT | M_ZERO);
 258         softc->state = PASS_STATE_NORMAL;
 259         softc->pd_type = SID_TYPE(&cgd->inq_data);
 260
 261         periph->softc = softc;
 262         cam_extend_set(passperiphs, periph->unit_number, periph);
 263
 264         /*
 265          * We pass in 0 for a blocksize, since we don't
 266          * know what the blocksize of this device is, if
 267          * it even has a blocksize.
 268          */
 269         CAM_SIM_UNLOCK(periph->sim);
 270         no_tags = (cgd->inq_data.flags & SID_CmdQue) == 0;
 271         devstat_add_entry(&softc->device_stats, "pass", periph->unit_number, 0,
 272                           DEVSTAT_NO_BLOCKSIZE
 273                           | (no_tags ? DEVSTAT_NO_ORDERED_TAGS : 0),
 274                           softc->pd_type |
 275                           DEVSTAT_TYPE_IF_SCSI |
 276                           DEVSTAT_TYPE_PASS,
 277                           DEVSTAT_PRIORITY_PASS);
 278
 279         /* Register the device */
 280         dev_ops_add(&pass_ops, -1, periph->unit_number);
 281         make_dev(&pass_ops, periph->unit_number, UID_ROOT,
 282                   GID_OPERATOR, 0600, "%s%d", periph->periph_name,
 283                   periph->unit_number);
 284         CAM_SIM_LOCK(periph->sim);
 285         /*
 286          * Add an async callback so that we get
 287          * notified if this device goes away.
 288          */
 289         xpt_register_async(AC_LOST_DEVICE, passasync, periph, periph->path);
 290
 291         if (bootverbose)
 292                 xpt_announce_periph(periph, NULL);
 293
 294         return(CAM_REQ_CMP);
 295 }
 296
 297 static int
 298 passopen(struct dev_open_args *ap)
 299 {
 300         cdev_t dev = ap->a_head.a_dev;
 301         struct cam_periph *periph;
 302         struct pass_softc *softc;
 303         int unit, error;
 304
 305         error = 0; /* default to no error */
 306
 307         /* unit = dkunit(dev); */
 308         /* XXX KDM fix this */
 309         unit = minor(dev) & 0xff;
 310
 311         periph = cam_extend_get(passperiphs, unit);
 312
 313         if (cam_periph_acquire(periph) != CAM_REQ_CMP)
 314                 return (ENXIO);
 315
 316         cam_periph_lock(periph);
 317
 318         softc = (struct pass_softc *)periph->softc;
 319
 320         if (softc->flags & PASS_FLAG_INVALID) {
 321                 cam_periph_unlock(periph);
 322                 cam_periph_release(periph);
 323                 return(ENXIO);
 324         }
 325
 326         /*
 327          * Don't allow access when we're running at a high securelevel.
 328          */
 329         if (securelevel > 1) {
 330                 cam_periph_unlock(periph);
 331                 cam_periph_release(periph);
 332                 return(EPERM);
 333         }
 334
 335         /*
 336          * Only allow read-write access.
 337          */
 338         if (((ap->a_oflags & FWRITE) == 0) || ((ap->a_oflags & FREAD) == 0)) {
 339                 cam_periph_unlock(periph);
 340                 cam_periph_release(periph);
 341                 return(EPERM);
 342         }
 343
 344         /*
 345          * We don't allow nonblocking access.
 346          */
 347         if ((ap->a_oflags & O_NONBLOCK) != 0) {
 348                 xpt_print(periph->path, "can't do nonblocking access\n");
 349                 cam_periph_unlock(periph);
 350                 cam_periph_release(periph);
 351                 return(EINVAL);
 352         }
 353
 354         if ((softc->flags & PASS_FLAG_OPEN) == 0) {
 355                 softc->flags |= PASS_FLAG_OPEN;
 356         } else {
 357                 /* Device closes aren't symmertical, so fix up the refcount */
 358                 cam_periph_release(periph);
 359         }
 360
 361         cam_periph_unlock(periph);
 362
 363         return (error);
 364 }
 365
 366 static int
 367 passclose(struct dev_close_args *ap)
 368 {
 369         cdev_t dev = ap->a_head.a_dev;
 370         struct  cam_periph *periph;
 371         struct  pass_softc *softc;
 372         int     unit;
 373
 374         /* unit = dkunit(dev); */
 375         /* XXX KDM fix this */
 376         unit = minor(dev) & 0xff;
 377
 378         periph = cam_extend_get(passperiphs, unit);
 379         if (periph == NULL)
 380                 return (ENXIO);
 381
 382         cam_periph_lock(periph);
 383
 384         softc = (struct pass_softc *)periph->softc;
 385         softc->flags &= ~PASS_FLAG_OPEN;
 386
 387         cam_periph_unlock(periph);
 388         cam_periph_release(periph);
 389
 390         return (0);
 391 }
 392
 393 static void
 394 passstart(struct cam_periph *periph, union ccb *start_ccb)
 395 {
 396         struct pass_softc *softc;
 397
 398         softc = (struct pass_softc *)periph->softc;
 399
 400         switch (softc->state) {
 401         case PASS_STATE_NORMAL:
 402                 start_ccb->ccb_h.ccb_type = PASS_CCB_WAITING;
 403                 SLIST_INSERT_HEAD(&periph->ccb_list, &start_ccb->ccb_h,
 404                                   periph_links.sle);
 405                 periph->immediate_priority = CAM_PRIORITY_NONE;
 406                 wakeup(&periph->ccb_list);
 407                 break;
 408         }
 409 }
 410
 411 static void
 412 passdone(struct cam_periph *periph, union ccb *done_ccb)
 413 {
 414         struct pass_softc *softc;
 415         struct ccb_scsiio *csio;
 416
 417         softc = (struct pass_softc *)periph->softc;
 418         csio = &done_ccb->csio;
 419         switch (csio->ccb_h.ccb_type) {
 420         case PASS_CCB_WAITING:
 421                 /* Caller will release the CCB */
 422                 wakeup(&done_ccb->ccb_h.cbfcnp);
 423                 return;
 424         }
 425         xpt_release_ccb(done_ccb);
 426 }
 427
 428 static int
 429 passioctl(struct dev_ioctl_args *ap)
 430 {
 431         cdev_t dev = ap->a_head.a_dev;
 432         caddr_t addr = ap->a_data;
 433         struct  cam_periph *periph;
 434         struct  pass_softc *softc;
 435         u_int8_t unit;
 436         int      error;
 437
 438
 439         /* unit = dkunit(dev); */
 440         /* XXX KDM fix this */
 441         unit = minor(dev) & 0xff;
 442
 443         periph = cam_extend_get(passperiphs, unit);
 444
 445         if (periph == NULL)
 446                 return(ENXIO);
 447
 448         cam_periph_lock(periph);
 449         softc = (struct pass_softc *)periph->softc;
 450
 451         error = 0;
 452
 453         switch (ap->a_cmd) {
 454
 455         case CAMIOCOMMAND:
 456         {
 457                 union ccb *inccb;
 458                 union ccb *ccb;
 459                 int ccb_malloced;
 460
 461                 inccb = (union ccb *)addr;
 462
 463                 /*
 464                  * Some CCB types, like scan bus and scan lun can only go
 465                  * through the transport layer device.
 466                  */
 467                 if (inccb->ccb_h.func_code & XPT_FC_XPT_ONLY) {
 468                         xpt_print(periph->path, "CCB function code %#x is "
 469                             "restricted to the XPT device\n",
 470                             inccb->ccb_h.func_code);
 471                         error = ENODEV;
 472                         break;
 473                 }
 474
 475                 /*
 476                  * Non-immediate CCBs need a CCB from the per-device pool
 477                  * of CCBs, which is scheduled by the transport layer.
 478                  * Immediate CCBs and user-supplied CCBs should just be
 479                  * malloced.
 480                  */
 481                 if ((inccb->ccb_h.func_code & XPT_FC_QUEUED)
 482                  && ((inccb->ccb_h.func_code & XPT_FC_USER_CCB) == 0)) {
 483                         ccb = cam_periph_getccb(periph,
 484                                                 inccb->ccb_h.pinfo.priority);
 485                         ccb_malloced = 0;
 486                 } else {
 487                         ccb = xpt_alloc_ccb();
 488
 489                         if (ccb != NULL)
 490                                 xpt_setup_ccb(&ccb->ccb_h, periph->path,
 491                                               inccb->ccb_h.pinfo.priority);
 492                         ccb_malloced = 1;
 493                 }
 494
 495                 if (ccb == NULL) {
 496                         xpt_print(periph->path, "unable to allocate CCB\n");
 497                         error = ENOMEM;
 498                         break;
 499                 }
 500
 501                 error = passsendccb(periph, ccb, inccb);
 502
 503                 if (ccb_malloced)
 504                         xpt_free_ccb(ccb);
 505                 else
 506                         xpt_release_ccb(ccb);
 507
 508                 break;
 509         }
 510         default:
 511                 error = cam_periph_ioctl(periph, ap->a_cmd, addr, passerror);
 512                 break;
 513         }
 514
 515         cam_periph_unlock(periph);
 516         return(error);
 517 }
 518
 519 /*
 520  * Generally, "ccb" should be the CCB supplied by the kernel.  "inccb"
 521  * should be the CCB that is copied in from the user.
 522  */
 523 static int
 524 passsendccb(struct cam_periph *periph, union ccb *ccb, union ccb *inccb)
 525 {
 526         struct pass_softc *softc;
 527         struct cam_periph_map_info mapinfo;
 528         int error, need_unmap;
 529
 530         softc = (struct pass_softc *)periph->softc;
 531
 532         need_unmap = 0;
 533
 534         /*
 535          * There are some fields in the CCB header that need to be
 536          * preserved, the rest we get from the user.
 537          */
 538         xpt_merge_ccb(ccb, inccb);
 539
 540         /*
 541          * There's no way for the user to have a completion
 542          * function, so we put our own completion function in here.
 543          */
 544         ccb->ccb_h.cbfcnp = passdone;
 545
 546         /*
 547          * We only attempt to map the user memory into kernel space
 548          * if they haven't passed in a physical memory pointer,
 549          * and if there is actually an I/O operation to perform.
 550          * Right now cam_periph_mapmem() only supports SCSI and device
 551          * match CCBs.  For the SCSI CCBs, we only pass the CCB in if
 552          * there's actually data to map.  cam_periph_mapmem() will do the
 553          * right thing, even if there isn't data to map, but since CCBs
 554          * without data are a reasonably common occurance (e.g. test unit
 555          * ready), it will save a few cycles if we check for it here.
 556          */
 557         if (((ccb->ccb_h.flags & CAM_DATA_PHYS) == 0)
 558          && (((ccb->ccb_h.func_code == XPT_SCSI_IO)
 559             && ((ccb->ccb_h.flags & CAM_DIR_MASK) != CAM_DIR_NONE))
 560           || (ccb->ccb_h.func_code == XPT_DEV_MATCH))) {
 561
 562                 bzero(&mapinfo, sizeof(mapinfo));
 563
 564                 /*
 565                  * cam_periph_mapmem calls into proc and vm functions that can
 566                  * sleep as well as trigger I/O, so we can't hold the lock.
 567                  * Dropping it here is reasonably safe.
 568                  */
 569                 cam_periph_unlock(periph);
 570                 error = cam_periph_mapmem(ccb, &mapinfo);
 571                 cam_periph_lock(periph);
 572
 573                 /*
 574                  * cam_periph_mapmem returned an error, we can't continue.
 575                  * Return the error to the user.
 576                  */
 577                 if (error)
 578                         return(error);
 579
 580                 /*
 581                  * We successfully mapped the memory in, so we need to
 582                  * unmap it when the transaction is done.
 583                  */
 584                 need_unmap = 1;
 585         }
 586
 587         /*
 588          * If the user wants us to perform any error recovery, then honor
 589          * that request.  Otherwise, it's up to the user to perform any
 590          * error recovery.
 591          */
 592         error = cam_periph_runccb(ccb,
 593                                   (ccb->ccb_h.flags & CAM_PASS_ERR_RECOVER) ?
 594                                   passerror : NULL,
 595                                   /* cam_flags */ CAM_RETRY_SELTO,
 596                                   /* sense_flags */SF_RETRY_UA,
 597                                   &softc->device_stats);
 598
 599         if (need_unmap != 0)
 600                 cam_periph_unmapmem(ccb, &mapinfo);
 601
 602         ccb->ccb_h.cbfcnp = NULL;
 603         ccb->ccb_h.periph_priv = inccb->ccb_h.periph_priv;
 604         bcopy(ccb, inccb, sizeof(union ccb));
 605
 606         return(error);
 607 }
 608
 609 static int
 610 passerror(union ccb *ccb, u_int32_t cam_flags, u_int32_t sense_flags)
 611 {
 612         struct cam_periph *periph;
 613         struct pass_softc *softc;
 614
 615         periph = xpt_path_periph(ccb->ccb_h.path);
 616         softc = (struct pass_softc *)periph->softc;
 617
 618         return(cam_periph_error(ccb, cam_flags, sense_flags,
 619                                  &softc->saved_ccb));
 620 }