sys/cam/cam_xpt.c

   1 /*-
   2  * Implementation of the Common Access Method Transport (XPT) layer.
   3  *
   4  * Copyright (c) 1997, 1998, 1999 Justin T. Gibbs.
   5  * Copyright (c) 1997, 1998, 1999 Kenneth D. Merry.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions, and the following disclaimer,
  13  *    without modification, immediately at the beginning of the file.
  14  * 2. The name of the author may not be used to endorse or promote products
  15  *    derived from this software without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
  21  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #include <sys/cdefs.h>
  31 __FBSDID("$FreeBSD$");
  32
  33 #include <sys/param.h>
  34 #include <sys/bus.h>
  35 #include <sys/systm.h>
  36 #include <sys/types.h>
  37 #include <sys/malloc.h>
  38 #include <sys/kernel.h>
  39 #include <sys/time.h>
  40 #include <sys/conf.h>
  41 #include <sys/fcntl.h>
  42 #include <sys/reboot.h>
  43 #include <sys/interrupt.h>
  44 #include <sys/sbuf.h>
  45 #include <sys/taskqueue.h>
  46
  47 #include <sys/lock.h>
  48 #include <sys/mutex.h>
  49 #include <sys/sysctl.h>
  50 #include <sys/kthread.h>
  51
  52 #include <cam/cam.h>
  53 #include <cam/cam_ccb.h>
  54 #include <cam/cam_periph.h>
  55 #include <cam/cam_queue.h>
  56 #include <cam/cam_sim.h>
  57 #include <cam/cam_xpt.h>
  58 #include <cam/cam_xpt_sim.h>
  59 #include <cam/cam_xpt_periph.h>
  60 #include <cam/cam_xpt_internal.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_pass.h>
  66
  67 #include <machine/md_var.h>     /* geometry translation */
  68 #include <machine/stdarg.h>     /* for xpt_print below */
  69
  70 #include "opt_cam.h"
  71
  72 /*
  73  * This is the maximum number of high powered commands (e.g. start unit)
  74  * that can be outstanding at a particular time.
  75  */
  76 #ifndef CAM_MAX_HIGHPOWER
  77 #define CAM_MAX_HIGHPOWER  4
  78 #endif
  79
  80 /* Datastructures internal to the xpt layer */
  81 MALLOC_DEFINE(M_CAMXPT, "CAM XPT", "CAM XPT buffers");
  82
  83 /* Object for defering XPT actions to a taskqueue */
  84 struct xpt_task {
  85         struct task     task;
  86         void            *data1;
  87         uintptr_t       data2;
  88 };
  89
  90 typedef enum {
  91         XPT_FLAG_OPEN           = 0x01
  92 } xpt_flags;
  93
  94 struct xpt_softc {
  95         xpt_flags               flags;
  96         u_int32_t               xpt_generation;
  97
  98         /* number of high powered commands that can go through right now */
  99         STAILQ_HEAD(highpowerlist, ccb_hdr)     highpowerq;
 100         int                     num_highpower;
 101
 102         /* queue for handling async rescan requests. */
 103         TAILQ_HEAD(, ccb_hdr) ccb_scanq;
 104         int buses_to_config;
 105         int buses_config_done;
 106
 107         /* Registered busses */
 108         TAILQ_HEAD(,cam_eb)     xpt_busses;
 109         u_int                   bus_generation;
 110
 111         struct intr_config_hook *xpt_config_hook;
 112
 113         int                     boot_delay;
 114         struct callout          boot_callout;
 115
 116         struct mtx              xpt_topo_lock;
 117         struct mtx              xpt_lock;
 118 };
 119
 120 typedef enum {
 121         DM_RET_COPY             = 0x01,
 122         DM_RET_FLAG_MASK        = 0x0f,
 123         DM_RET_NONE             = 0x00,
 124         DM_RET_STOP             = 0x10,
 125         DM_RET_DESCEND          = 0x20,
 126         DM_RET_ERROR            = 0x30,
 127         DM_RET_ACTION_MASK      = 0xf0
 128 } dev_match_ret;
 129
 130 typedef enum {
 131         XPT_DEPTH_BUS,
 132         XPT_DEPTH_TARGET,
 133         XPT_DEPTH_DEVICE,
 134         XPT_DEPTH_PERIPH
 135 } xpt_traverse_depth;
 136
 137 struct xpt_traverse_config {
 138         xpt_traverse_depth      depth;
 139         void                    *tr_func;
 140         void                    *tr_arg;
 141 };
 142
 143 typedef int     xpt_busfunc_t (struct cam_eb *bus, void *arg);
 144 typedef int     xpt_targetfunc_t (struct cam_et *target, void *arg);
 145 typedef int     xpt_devicefunc_t (struct cam_ed *device, void *arg);
 146 typedef int     xpt_periphfunc_t (struct cam_periph *periph, void *arg);
 147 typedef int     xpt_pdrvfunc_t (struct periph_driver **pdrv, void *arg);
 148
 149 /* Transport layer configuration information */
 150 static struct xpt_softc xsoftc;
 151
 152 TUNABLE_INT("kern.cam.boot_delay", &xsoftc.boot_delay);
 153 SYSCTL_INT(_kern_cam, OID_AUTO, boot_delay, CTLFLAG_RDTUN,
 154            &xsoftc.boot_delay, 0, "Bus registration wait time");
 155
 156 /* Queues for our software interrupt handler */
 157 typedef TAILQ_HEAD(cam_isrq, ccb_hdr) cam_isrq_t;
 158 typedef TAILQ_HEAD(cam_simq, cam_sim) cam_simq_t;
 159 static cam_simq_t cam_simq;
 160 static struct mtx cam_simq_lock;
 161
 162 /* Pointers to software interrupt handlers */
 163 static void *cambio_ih;
 164
 165 struct cam_periph *xpt_periph;
 166
 167 static periph_init_t xpt_periph_init;
 168
 169 static struct periph_driver xpt_driver =
 170 {
 171         xpt_periph_init, "xpt",
 172         TAILQ_HEAD_INITIALIZER(xpt_driver.units), /* generation */ 0,
 173         CAM_PERIPH_DRV_EARLY
 174 };
 175
 176 PERIPHDRIVER_DECLARE(xpt, xpt_driver);
 177
 178 static d_open_t xptopen;
 179 static d_close_t xptclose;
 180 static d_ioctl_t xptioctl;
 181
 182 static struct cdevsw xpt_cdevsw = {
 183         .d_version =    D_VERSION,
 184         .d_flags =      0,
 185         .d_open =       xptopen,
 186         .d_close =      xptclose,
 187         .d_ioctl =      xptioctl,
 188         .d_name =       "xpt",
 189 };
 190
 191 /* Storage for debugging datastructures */
 192 struct cam_path *cam_dpath;
 193 u_int32_t cam_dflags = CAM_DEBUG_FLAGS;
 194 TUNABLE_INT("kern.cam.dflags", &cam_dflags);
 195 SYSCTL_INT(_kern_cam, OID_AUTO, dflags, CTLFLAG_RW,
 196         &cam_dflags, 0, "Enabled debug flags");
 197 u_int32_t cam_debug_delay = CAM_DEBUG_DELAY;
 198 TUNABLE_INT("kern.cam.debug_delay", &cam_debug_delay);
 199 SYSCTL_INT(_kern_cam, OID_AUTO, debug_delay, CTLFLAG_RW,
 200         &cam_debug_delay, 0, "Delay in us after each debug message");
 201
 202 /* Our boot-time initialization hook */
 203 static int cam_module_event_handler(module_t, int /*modeventtype_t*/, void *);
 204
 205 static moduledata_t cam_moduledata = {
 206         "cam",
 207         cam_module_event_handler,
 208         NULL
 209 };
 210
 211 static int      xpt_init(void *);
 212
 213 DECLARE_MODULE(cam, cam_moduledata, SI_SUB_CONFIGURE, SI_ORDER_SECOND);
 214 MODULE_VERSION(cam, 1);
 215
 216
 217 static void             xpt_async_bcast(struct async_list *async_head,
 218                                         u_int32_t async_code,
 219                                         struct cam_path *path,
 220                                         void *async_arg);
 221 static path_id_t xptnextfreepathid(void);
 222 static path_id_t xptpathid(const char *sim_name, int sim_unit, int sim_bus);
 223 static union ccb *xpt_get_ccb(struct cam_ed *device);
 224 static void      xpt_run_dev_allocq(struct cam_eb *bus);
 225 static void      xpt_run_dev_sendq(struct cam_eb *bus);
 226 static timeout_t xpt_release_devq_timeout;
 227 static void      xpt_release_simq_timeout(void *arg) __unused;
 228 static void      xpt_release_bus(struct cam_eb *bus);
 229 static void      xpt_release_devq_device(struct cam_ed *dev, cam_rl rl,
 230                     u_int count, int run_queue);
 231 static struct cam_et*
 232                  xpt_alloc_target(struct cam_eb *bus, target_id_t target_id);
 233 static void      xpt_release_target(struct cam_et *target);
 234 static struct cam_eb*
 235                  xpt_find_bus(path_id_t path_id);
 236 static struct cam_et*
 237                  xpt_find_target(struct cam_eb *bus, target_id_t target_id);
 238 static struct cam_ed*
 239                  xpt_find_device(struct cam_et *target, lun_id_t lun_id);
 240 static void      xpt_config(void *arg);
 241 static xpt_devicefunc_t xptpassannouncefunc;
 242 static void      xptaction(struct cam_sim *sim, union ccb *work_ccb);
 243 static void      xptpoll(struct cam_sim *sim);
 244 static void      camisr(void *);
 245 static void      camisr_runqueue(void *);
 246 static dev_match_ret    xptbusmatch(struct dev_match_pattern *patterns,
 247                                     u_int num_patterns, struct cam_eb *bus);
 248 static dev_match_ret    xptdevicematch(struct dev_match_pattern *patterns,
 249                                        u_int num_patterns,
 250                                        struct cam_ed *device);
 251 static dev_match_ret    xptperiphmatch(struct dev_match_pattern *patterns,
 252                                        u_int num_patterns,
 253                                        struct cam_periph *periph);
 254 static xpt_busfunc_t    xptedtbusfunc;
 255 static xpt_targetfunc_t xptedttargetfunc;
 256 static xpt_devicefunc_t xptedtdevicefunc;
 257 static xpt_periphfunc_t xptedtperiphfunc;
 258 static xpt_pdrvfunc_t   xptplistpdrvfunc;
 259 static xpt_periphfunc_t xptplistperiphfunc;
 260 static int              xptedtmatch(struct ccb_dev_match *cdm);
 261 static int              xptperiphlistmatch(struct ccb_dev_match *cdm);
 262 static int              xptbustraverse(struct cam_eb *start_bus,
 263                                        xpt_busfunc_t *tr_func, void *arg);
 264 static int              xpttargettraverse(struct cam_eb *bus,
 265                                           struct cam_et *start_target,
 266                                           xpt_targetfunc_t *tr_func, void *arg);
 267 static int              xptdevicetraverse(struct cam_et *target,
 268                                           struct cam_ed *start_device,
 269                                           xpt_devicefunc_t *tr_func, void *arg);
 270 static int              xptperiphtraverse(struct cam_ed *device,
 271                                           struct cam_periph *start_periph,
 272                                           xpt_periphfunc_t *tr_func, void *arg);
 273 static int              xptpdrvtraverse(struct periph_driver **start_pdrv,
 274                                         xpt_pdrvfunc_t *tr_func, void *arg);
 275 static int              xptpdperiphtraverse(struct periph_driver **pdrv,
 276                                             struct cam_periph *start_periph,
 277                                             xpt_periphfunc_t *tr_func,
 278                                             void *arg);
 279 static xpt_busfunc_t    xptdefbusfunc;
 280 static xpt_targetfunc_t xptdeftargetfunc;
 281 static xpt_devicefunc_t xptdefdevicefunc;
 282 static xpt_periphfunc_t xptdefperiphfunc;
 283 static void             xpt_finishconfig_task(void *context, int pending);
 284 static int              xpt_for_all_busses(xpt_busfunc_t *tr_func, void *arg);
 285 static int              xpt_for_all_devices(xpt_devicefunc_t *tr_func,
 286                                             void *arg);
 287 static void             xpt_dev_async_default(u_int32_t async_code,
 288                                               struct cam_eb *bus,
 289                                               struct cam_et *target,
 290                                               struct cam_ed *device,
 291                                               void *async_arg);
 292 static struct cam_ed *  xpt_alloc_device_default(struct cam_eb *bus,
 293                                                  struct cam_et *target,
 294                                                  lun_id_t lun_id);
 295 static xpt_devicefunc_t xptsetasyncfunc;
 296 static xpt_busfunc_t    xptsetasyncbusfunc;
 297 static cam_status       xptregister(struct cam_periph *periph,
 298                                     void *arg);
 299 static __inline int periph_is_queued(struct cam_periph *periph);
 300 static __inline int device_is_alloc_queued(struct cam_ed *device);
 301 static __inline int device_is_send_queued(struct cam_ed *device);
 302
 303 static __inline int
 304 xpt_schedule_dev_allocq(struct cam_eb *bus, struct cam_ed *dev)
 305 {
 306         int retval;
 307
 308         if ((dev->drvq.entries > 0) &&
 309             (dev->ccbq.devq_openings > 0) &&
 310             (cam_ccbq_frozen(&dev->ccbq, CAM_PRIORITY_TO_RL(
 311                 CAMQ_GET_PRIO(&dev->drvq))) == 0)) {
 312                 /*
 313                  * The priority of a device waiting for CCB resources
 314                  * is that of the highest priority peripheral driver
 315                  * enqueued.
 316                  */
 317                 retval = xpt_schedule_dev(&bus->sim->devq->alloc_queue,
 318                                           &dev->alloc_ccb_entry.pinfo,
 319                                           CAMQ_GET_PRIO(&dev->drvq));
 320         } else {
 321                 retval = 0;
 322         }
 323
 324         return (retval);
 325 }
 326
 327 static __inline int
 328 xpt_schedule_dev_sendq(struct cam_eb *bus, struct cam_ed *dev)
 329 {
 330         int     retval;
 331
 332         if ((dev->ccbq.queue.entries > 0) &&
 333             (dev->ccbq.dev_openings > 0) &&
 334             (cam_ccbq_frozen_top(&dev->ccbq) == 0)) {
 335                 /*
 336                  * The priority of a device waiting for controller
 337                  * resources is that of the highest priority CCB
 338                  * enqueued.
 339                  */
 340                 retval =
 341                     xpt_schedule_dev(&bus->sim->devq->send_queue,
 342                                      &dev->send_ccb_entry.pinfo,
 343                                      CAMQ_GET_PRIO(&dev->ccbq.queue));
 344         } else {
 345                 retval = 0;
 346         }
 347         return (retval);
 348 }
 349
 350 static __inline int
 351 periph_is_queued(struct cam_periph *periph)
 352 {
 353         return (periph->pinfo.index != CAM_UNQUEUED_INDEX);
 354 }
 355
 356 static __inline int
 357 device_is_alloc_queued(struct cam_ed *device)
 358 {
 359         return (device->alloc_ccb_entry.pinfo.index != CAM_UNQUEUED_INDEX);
 360 }
 361
 362 static __inline int
 363 device_is_send_queued(struct cam_ed *device)
 364 {
 365         return (device->send_ccb_entry.pinfo.index != CAM_UNQUEUED_INDEX);
 366 }
 367
 368 static void
 369 xpt_periph_init()
 370 {
 371         make_dev(&xpt_cdevsw, 0, UID_ROOT, GID_OPERATOR, 0600, "xpt0");
 372 }
 373
 374 static void
 375 xptdone(struct cam_periph *periph, union ccb *done_ccb)
 376 {
 377         /* Caller will release the CCB */
 378         wakeup(&done_ccb->ccb_h.cbfcnp);
 379 }
 380
 381 static int
 382 xptopen(struct cdev *dev, int flags, int fmt, struct thread *td)
 383 {
 384
 385         /*
 386          * Only allow read-write access.
 387          */
 388         if (((flags & FWRITE) == 0) || ((flags & FREAD) == 0))
 389                 return(EPERM);
 390
 391         /*
 392          * We don't allow nonblocking access.
 393          */
 394         if ((flags & O_NONBLOCK) != 0) {
 395                 printf("%s: can't do nonblocking access\n", devtoname(dev));
 396                 return(ENODEV);
 397         }
 398
 399         /* Mark ourselves open */
 400         mtx_lock(&xsoftc.xpt_lock);
 401         xsoftc.flags |= XPT_FLAG_OPEN;
 402         mtx_unlock(&xsoftc.xpt_lock);
 403
 404         return(0);
 405 }
 406
 407 static int
 408 xptclose(struct cdev *dev, int flag, int fmt, struct thread *td)
 409 {
 410
 411         /* Mark ourselves closed */
 412         mtx_lock(&xsoftc.xpt_lock);
 413         xsoftc.flags &= ~XPT_FLAG_OPEN;
 414         mtx_unlock(&xsoftc.xpt_lock);
 415
 416         return(0);
 417 }
 418
 419 /*
 420  * Don't automatically grab the xpt softc lock here even though this is going
 421  * through the xpt device.  The xpt device is really just a back door for
 422  * accessing other devices and SIMs, so the right thing to do is to grab
 423  * the appropriate SIM lock once the bus/SIM is located.
 424  */
 425 static int
 426 xptioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flag, struct thread *td)
 427 {
 428         int error;
 429
 430         error = 0;
 431
 432         switch(cmd) {
 433         /*
 434          * For the transport layer CAMIOCOMMAND ioctl, we really only want
 435          * to accept CCB types that don't quite make sense to send through a
 436          * passthrough driver. XPT_PATH_INQ is an exception to this, as stated
 437          * in the CAM spec.
 438          */
 439         case CAMIOCOMMAND: {
 440                 union ccb *ccb;
 441                 union ccb *inccb;
 442                 struct cam_eb *bus;
 443
 444                 inccb = (union ccb *)addr;
 445
 446                 bus = xpt_find_bus(inccb->ccb_h.path_id);
 447                 if (bus == NULL)
 448                         return (EINVAL);
 449
 450                 switch (inccb->ccb_h.func_code) {
 451                 case XPT_SCAN_BUS:
 452                 case XPT_RESET_BUS:
 453                         if (inccb->ccb_h.target_id != CAM_TARGET_WILDCARD ||
 454                             inccb->ccb_h.target_lun != CAM_LUN_WILDCARD) {
 455                                 xpt_release_bus(bus);
 456                                 return (EINVAL);
 457                         }
 458                         break;
 459                 case XPT_SCAN_TGT:
 460                         if (inccb->ccb_h.target_id == CAM_TARGET_WILDCARD ||
 461                             inccb->ccb_h.target_lun != CAM_LUN_WILDCARD) {
 462                                 xpt_release_bus(bus);
 463                                 return (EINVAL);
 464                         }
 465                         break;
 466                 default:
 467                         break;
 468                 }
 469
 470                 switch(inccb->ccb_h.func_code) {
 471                 case XPT_SCAN_BUS:
 472                 case XPT_RESET_BUS:
 473                 case XPT_PATH_INQ:
 474                 case XPT_ENG_INQ:
 475                 case XPT_SCAN_LUN:
 476                 case XPT_SCAN_TGT:
 477
 478                         ccb = xpt_alloc_ccb();
 479
 480                         CAM_SIM_LOCK(bus->sim);
 481
 482                         /*
 483                          * Create a path using the bus, target, and lun the
 484                          * user passed in.
 485                          */
 486                         if (xpt_create_path(&ccb->ccb_h.path, xpt_periph,
 487                                             inccb->ccb_h.path_id,
 488                                             inccb->ccb_h.target_id,
 489                                             inccb->ccb_h.target_lun) !=
 490                                             CAM_REQ_CMP){
 491                                 error = EINVAL;
 492                                 CAM_SIM_UNLOCK(bus->sim);
 493                                 xpt_free_ccb(ccb);
 494                                 break;
 495                         }
 496                         /* Ensure all of our fields are correct */
 497                         xpt_setup_ccb(&ccb->ccb_h, ccb->ccb_h.path,
 498                                       inccb->ccb_h.pinfo.priority);
 499                         xpt_merge_ccb(ccb, inccb);
 500                         ccb->ccb_h.cbfcnp = xptdone;
 501                         cam_periph_runccb(ccb, NULL, 0, 0, NULL);
 502                         bcopy(ccb, inccb, sizeof(union ccb));
 503                         xpt_free_path(ccb->ccb_h.path);
 504                         xpt_free_ccb(ccb);
 505                         CAM_SIM_UNLOCK(bus->sim);
 506                         break;
 507
 508                 case XPT_DEBUG: {
 509                         union ccb ccb;
 510
 511                         /*
 512                          * This is an immediate CCB, so it's okay to
 513                          * allocate it on the stack.
 514                          */
 515
 516                         CAM_SIM_LOCK(bus->sim);
 517
 518                         /*
 519                          * Create a path using the bus, target, and lun the
 520                          * user passed in.
 521                          */
 522                         if (xpt_create_path(&ccb.ccb_h.path, xpt_periph,
 523                                             inccb->ccb_h.path_id,
 524                                             inccb->ccb_h.target_id,
 525                                             inccb->ccb_h.target_lun) !=
 526                                             CAM_REQ_CMP){
 527                                 error = EINVAL;
 528                                 CAM_SIM_UNLOCK(bus->sim);
 529                                 break;
 530                         }
 531                         /* Ensure all of our fields are correct */
 532                         xpt_setup_ccb(&ccb.ccb_h, ccb.ccb_h.path,
 533                                       inccb->ccb_h.pinfo.priority);
 534                         xpt_merge_ccb(&ccb, inccb);
 535                         ccb.ccb_h.cbfcnp = xptdone;
 536                         xpt_action(&ccb);
 537                         CAM_SIM_UNLOCK(bus->sim);
 538                         bcopy(&ccb, inccb, sizeof(union ccb));
 539                         xpt_free_path(ccb.ccb_h.path);
 540                         break;
 541
 542                 }
 543                 case XPT_DEV_MATCH: {
 544                         struct cam_periph_map_info mapinfo;
 545                         struct cam_path *old_path;
 546
 547                         /*
 548                          * We can't deal with physical addresses for this
 549                          * type of transaction.
 550                          */
 551                         if (inccb->ccb_h.flags & CAM_DATA_PHYS) {
 552                                 error = EINVAL;
 553                                 break;
 554                         }
 555
 556                         /*
 557                          * Save this in case the caller had it set to
 558                          * something in particular.
 559                          */
 560                         old_path = inccb->ccb_h.path;
 561
 562                         /*
 563                          * We really don't need a path for the matching
 564                          * code.  The path is needed because of the
 565                          * debugging statements in xpt_action().  They
 566                          * assume that the CCB has a valid path.
 567                          */
 568                         inccb->ccb_h.path = xpt_periph->path;
 569
 570                         bzero(&mapinfo, sizeof(mapinfo));
 571
 572                         /*
 573                          * Map the pattern and match buffers into kernel
 574                          * virtual address space.
 575                          */
 576                         error = cam_periph_mapmem(inccb, &mapinfo);
 577
 578                         if (error) {
 579                                 inccb->ccb_h.path = old_path;
 580                                 break;
 581                         }
 582
 583                         /*
 584                          * This is an immediate CCB, we can send it on directly.
 585                          */
 586                         xpt_action(inccb);
 587
 588                         /*
 589                          * Map the buffers back into user space.
 590                          */
 591                         cam_periph_unmapmem(inccb, &mapinfo);
 592
 593                         inccb->ccb_h.path = old_path;
 594
 595                         error = 0;
 596                         break;
 597                 }
 598                 default:
 599                         error = ENOTSUP;
 600                         break;
 601                 }
 602                 xpt_release_bus(bus);
 603                 break;
 604         }
 605         /*
 606          * This is the getpassthru ioctl. It takes a XPT_GDEVLIST ccb as input,
 607          * with the periphal driver name and unit name filled in.  The other
 608          * fields don't really matter as input.  The passthrough driver name
 609          * ("pass"), and unit number are passed back in the ccb.  The current
 610          * device generation number, and the index into the device peripheral
 611          * driver list, and the status are also passed back.  Note that
 612          * since we do everything in one pass, unlike the XPT_GDEVLIST ccb,
 613          * we never return a status of CAM_GDEVLIST_LIST_CHANGED.  It is
 614          * (or rather should be) impossible for the device peripheral driver
 615          * list to change since we look at the whole thing in one pass, and
 616          * we do it with lock protection.
 617          *
 618          */
 619         case CAMGETPASSTHRU: {
 620                 union ccb *ccb;
 621                 struct cam_periph *periph;
 622                 struct periph_driver **p_drv;
 623                 char   *name;
 624                 u_int unit;
 625                 u_int cur_generation;
 626                 int base_periph_found;
 627                 int splbreaknum;
 628
 629                 ccb = (union ccb *)addr;
 630                 unit = ccb->cgdl.unit_number;
 631                 name = ccb->cgdl.periph_name;
 632                 /*
 633                  * Every 100 devices, we want to drop our lock protection to
 634                  * give the software interrupt handler a chance to run.
 635                  * Most systems won't run into this check, but this should
 636                  * avoid starvation in the software interrupt handler in
 637                  * large systems.
 638                  */
 639                 splbreaknum = 100;
 640
 641                 ccb = (union ccb *)addr;
 642
 643                 base_periph_found = 0;
 644
 645                 /*
 646                  * Sanity check -- make sure we don't get a null peripheral
 647                  * driver name.
 648                  */
 649                 if (*ccb->cgdl.periph_name == '\0') {
 650                         error = EINVAL;
 651                         break;
 652                 }
 653
 654                 /* Keep the list from changing while we traverse it */
 655                 mtx_lock(&xsoftc.xpt_topo_lock);
 656 ptstartover:
 657                 cur_generation = xsoftc.xpt_generation;
 658
 659                 /* first find our driver in the list of drivers */
 660                 for (p_drv = periph_drivers; *p_drv != NULL; p_drv++)
 661                         if (strcmp((*p_drv)->driver_name, name) == 0)
 662                                 break;
 663
 664                 if (*p_drv == NULL) {
 665                         mtx_unlock(&xsoftc.xpt_topo_lock);
 666                         ccb->ccb_h.status = CAM_REQ_CMP_ERR;
 667                         ccb->cgdl.status = CAM_GDEVLIST_ERROR;
 668                         *ccb->cgdl.periph_name = '\0';
 669                         ccb->cgdl.unit_number = 0;
 670                         error = ENOENT;
 671                         break;
 672                 }
 673
 674                 /*
 675                  * Run through every peripheral instance of this driver
 676                  * and check to see whether it matches the unit passed
 677                  * in by the user.  If it does, get out of the loops and
 678                  * find the passthrough driver associated with that
 679                  * peripheral driver.
 680                  */
 681                 for (periph = TAILQ_FIRST(&(*p_drv)->units); periph != NULL;
 682                      periph = TAILQ_NEXT(periph, unit_links)) {
 683
 684                         if (periph->unit_number == unit) {
 685                                 break;
 686                         } else if (--splbreaknum == 0) {
 687                                 mtx_unlock(&xsoftc.xpt_topo_lock);
 688                                 mtx_lock(&xsoftc.xpt_topo_lock);
 689                                 splbreaknum = 100;
 690                                 if (cur_generation != xsoftc.xpt_generation)
 691                                        goto ptstartover;
 692                         }
 693                 }
 694                 /*
 695                  * If we found the peripheral driver that the user passed
 696                  * in, go through all of the peripheral drivers for that
 697                  * particular device and look for a passthrough driver.
 698                  */
 699                 if (periph != NULL) {
 700                         struct cam_ed *device;
 701                         int i;
 702
 703                         base_periph_found = 1;
 704                         device = periph->path->device;
 705                         for (i = 0, periph = SLIST_FIRST(&device->periphs);
 706                              periph != NULL;
 707                              periph = SLIST_NEXT(periph, periph_links), i++) {
 708                                 /*
 709                                  * Check to see whether we have a
 710                                  * passthrough device or not.
 711                                  */
 712                                 if (strcmp(periph->periph_name, "pass") == 0) {
 713                                         /*
 714                                          * Fill in the getdevlist fields.
 715                                          */
 716                                         strcpy(ccb->cgdl.periph_name,
 717                                                periph->periph_name);
 718                                         ccb->cgdl.unit_number =
 719                                                 periph->unit_number;
 720                                         if (SLIST_NEXT(periph, periph_links))
 721                                                 ccb->cgdl.status =
 722                                                         CAM_GDEVLIST_MORE_DEVS;
 723                                         else
 724                                                 ccb->cgdl.status =
 725                                                        CAM_GDEVLIST_LAST_DEVICE;
 726                                         ccb->cgdl.generation =
 727                                                 device->generation;
 728                                         ccb->cgdl.index = i;
 729                                         /*
 730                                          * Fill in some CCB header fields
 731                                          * that the user may want.
 732                                          */
 733                                         ccb->ccb_h.path_id =
 734                                                 periph->path->bus->path_id;
 735                                         ccb->ccb_h.target_id =
 736                                                 periph->path->target->target_id;
 737                                         ccb->ccb_h.target_lun =
 738                                                 periph->path->device->lun_id;
 739                                         ccb->ccb_h.status = CAM_REQ_CMP;
 740                                         break;
 741                                 }
 742                         }
 743                 }
 744
 745                 /*
 746                  * If the periph is null here, one of two things has
 747                  * happened.  The first possibility is that we couldn't
 748                  * find the unit number of the particular peripheral driver
 749                  * that the user is asking about.  e.g. the user asks for
 750                  * the passthrough driver for "da11".  We find the list of
 751                  * "da" peripherals all right, but there is no unit 11.
 752                  * The other possibility is that we went through the list
 753                  * of peripheral drivers attached to the device structure,
 754                  * but didn't find one with the name "pass".  Either way,
 755                  * we return ENOENT, since we couldn't find something.
 756                  */
 757                 if (periph == NULL) {
 758                         ccb->ccb_h.status = CAM_REQ_CMP_ERR;
 759                         ccb->cgdl.status = CAM_GDEVLIST_ERROR;
 760                         *ccb->cgdl.periph_name = '\0';
 761                         ccb->cgdl.unit_number = 0;
 762                         error = ENOENT;
 763                         /*
 764                          * It is unfortunate that this is even necessary,
 765                          * but there are many, many clueless users out there.
 766                          * If this is true, the user is looking for the
 767                          * passthrough driver, but doesn't have one in his
 768                          * kernel.
 769                          */
 770                         if (base_periph_found == 1) {
 771                                 printf("xptioctl: pass driver is not in the "
 772                                        "kernel\n");
 773                                 printf("xptioctl: put \"device pass\" in "
 774                                        "your kernel config file\n");
 775                         }
 776                 }
 777                 mtx_unlock(&xsoftc.xpt_topo_lock);
 778                 break;
 779                 }
 780         default:
 781                 error = ENOTTY;
 782                 break;
 783         }
 784
 785         return(error);
 786 }
 787
 788 static int
 789 cam_module_event_handler(module_t mod, int what, void *arg)
 790 {
 791         int error;
 792
 793         switch (what) {
 794         case MOD_LOAD:
 795                 if ((error = xpt_init(NULL)) != 0)
 796                         return (error);
 797                 break;
 798         case MOD_UNLOAD:
 799                 return EBUSY;
 800         default:
 801                 return EOPNOTSUPP;
 802         }
 803
 804         return 0;
 805 }
 806
 807 static void
 808 xpt_rescan_done(struct cam_periph *periph, union ccb *done_ccb)
 809 {
 810
 811         if (done_ccb->ccb_h.ppriv_ptr1 == NULL) {
 812                 xpt_free_path(done_ccb->ccb_h.path);
 813                 xpt_free_ccb(done_ccb);
 814         } else {
 815                 done_ccb->ccb_h.cbfcnp = done_ccb->ccb_h.ppriv_ptr1;
 816                 (*done_ccb->ccb_h.cbfcnp)(periph, done_ccb);
 817         }
 818         xpt_release_boot();
 819 }
 820
 821 /* thread to handle bus rescans */
 822 static void
 823 xpt_scanner_thread(void *dummy)
 824 {
 825         union ccb       *ccb;
 826         struct cam_sim  *sim;
 827
 828         xpt_lock_buses();
 829         for (;;) {
 830                 if (TAILQ_EMPTY(&xsoftc.ccb_scanq))
 831                         msleep(&xsoftc.ccb_scanq, &xsoftc.xpt_topo_lock, PRIBIO,
 832                                "ccb_scanq", 0);
 833                 if ((ccb = (union ccb *)TAILQ_FIRST(&xsoftc.ccb_scanq)) != NULL) {
 834                         TAILQ_REMOVE(&xsoftc.ccb_scanq, &ccb->ccb_h, sim_links.tqe);
 835                         xpt_unlock_buses();
 836
 837                         sim = ccb->ccb_h.path->bus->sim;
 838                         CAM_SIM_LOCK(sim);
 839                         xpt_action(ccb);
 840                         CAM_SIM_UNLOCK(sim);
 841
 842                         xpt_lock_buses();
 843                 }
 844         }
 845 }
 846
 847 void
 848 xpt_rescan(union ccb *ccb)
 849 {
 850         struct ccb_hdr *hdr;
 851
 852         /* Prepare request */
 853         if (ccb->ccb_h.path->target->target_id == CAM_TARGET_WILDCARD &&
 854             ccb->ccb_h.path->device->lun_id == CAM_LUN_WILDCARD)
 855                 ccb->ccb_h.func_code = XPT_SCAN_BUS;
 856         else if (ccb->ccb_h.path->target->target_id != CAM_TARGET_WILDCARD &&
 857             ccb->ccb_h.path->device->lun_id == CAM_LUN_WILDCARD)
 858                 ccb->ccb_h.func_code = XPT_SCAN_TGT;
 859         else if (ccb->ccb_h.path->target->target_id != CAM_TARGET_WILDCARD &&
 860             ccb->ccb_h.path->device->lun_id != CAM_LUN_WILDCARD)
 861                 ccb->ccb_h.func_code = XPT_SCAN_LUN;
 862         else {
 863                 xpt_print(ccb->ccb_h.path, "illegal scan path\n");
 864                 xpt_free_path(ccb->ccb_h.path);
 865                 xpt_free_ccb(ccb);
 866                 return;
 867         }
 868         ccb->ccb_h.ppriv_ptr1 = ccb->ccb_h.cbfcnp;
 869         ccb->ccb_h.cbfcnp = xpt_rescan_done;
 870         xpt_setup_ccb(&ccb->ccb_h, ccb->ccb_h.path, CAM_PRIORITY_XPT);
 871         /* Don't make duplicate entries for the same paths. */
 872         xpt_lock_buses();
 873         if (ccb->ccb_h.ppriv_ptr1 == NULL) {
 874                 TAILQ_FOREACH(hdr, &xsoftc.ccb_scanq, sim_links.tqe) {
 875                         if (xpt_path_comp(hdr->path, ccb->ccb_h.path) == 0) {
 876                                 wakeup(&xsoftc.ccb_scanq);
 877                                 xpt_unlock_buses();
 878                                 xpt_print(ccb->ccb_h.path, "rescan already queued\n");
 879                                 xpt_free_path(ccb->ccb_h.path);
 880                                 xpt_free_ccb(ccb);
 881                                 return;
 882                         }
 883                 }
 884         }
 885         TAILQ_INSERT_TAIL(&xsoftc.ccb_scanq, &ccb->ccb_h, sim_links.tqe);
 886         xsoftc.buses_to_config++;
 887         wakeup(&xsoftc.ccb_scanq);
 888         xpt_unlock_buses();
 889 }
 890
 891 /* Functions accessed by the peripheral drivers */
 892 static int
 893 xpt_init(void *dummy)
 894 {
 895         struct cam_sim *xpt_sim;
 896         struct cam_path *path;
 897         struct cam_devq *devq;
 898         cam_status status;
 899
 900         TAILQ_INIT(&xsoftc.xpt_busses);
 901         TAILQ_INIT(&cam_simq);
 902         TAILQ_INIT(&xsoftc.ccb_scanq);
 903         STAILQ_INIT(&xsoftc.highpowerq);
 904         xsoftc.num_highpower = CAM_MAX_HIGHPOWER;
 905
 906         mtx_init(&cam_simq_lock, "CAM SIMQ lock", NULL, MTX_DEF);
 907         mtx_init(&xsoftc.xpt_lock, "XPT lock", NULL, MTX_DEF);
 908         mtx_init(&xsoftc.xpt_topo_lock, "XPT topology lock", NULL, MTX_DEF);
 909
 910         /*
 911          * The xpt layer is, itself, the equivelent of a SIM.
 912          * Allow 16 ccbs in the ccb pool for it.  This should
 913          * give decent parallelism when we probe busses and
 914          * perform other XPT functions.
 915          */
 916         devq = cam_simq_alloc(16);
 917         xpt_sim = cam_sim_alloc(xptaction,
 918                                 xptpoll,
 919                                 "xpt",
 920                                 /*softc*/NULL,
 921                                 /*unit*/0,
 922                                 /*mtx*/&xsoftc.xpt_lock,
 923                                 /*max_dev_transactions*/0,
 924                                 /*max_tagged_dev_transactions*/0,
 925                                 devq);
 926         if (xpt_sim == NULL)
 927                 return (ENOMEM);
 928
 929         mtx_lock(&xsoftc.xpt_lock);
 930         if ((status = xpt_bus_register(xpt_sim, NULL, 0)) != CAM_SUCCESS) {
 931                 mtx_unlock(&xsoftc.xpt_lock);
 932                 printf("xpt_init: xpt_bus_register failed with status %#x,"
 933                        " failing attach\n", status);
 934                 return (EINVAL);
 935         }
 936
 937         /*
 938          * Looking at the XPT from the SIM layer, the XPT is
 939          * the equivelent of a peripheral driver.  Allocate
 940          * a peripheral driver entry for us.
 941          */
 942         if ((status = xpt_create_path(&path, NULL, CAM_XPT_PATH_ID,
 943                                       CAM_TARGET_WILDCARD,
 944                                       CAM_LUN_WILDCARD)) != CAM_REQ_CMP) {
 945                 mtx_unlock(&xsoftc.xpt_lock);
 946                 printf("xpt_init: xpt_create_path failed with status %#x,"
 947                        " failing attach\n", status);
 948                 return (EINVAL);
 949         }
 950
 951         cam_periph_alloc(xptregister, NULL, NULL, NULL, "xpt", CAM_PERIPH_BIO,
 952                          path, NULL, 0, xpt_sim);
 953         xpt_free_path(path);
 954         mtx_unlock(&xsoftc.xpt_lock);
 955         /* Install our software interrupt handlers */
 956         swi_add(NULL, "cambio", camisr, NULL, SWI_CAMBIO, INTR_MPSAFE, &cambio_ih);
 957         /*
 958          * Register a callback for when interrupts are enabled.
 959          */
 960         xsoftc.xpt_config_hook =
 961             (struct intr_config_hook *)malloc(sizeof(struct intr_config_hook),
 962                                               M_CAMXPT, M_NOWAIT | M_ZERO);
 963         if (xsoftc.xpt_config_hook == NULL) {
 964                 printf("xpt_init: Cannot malloc config hook "
 965                        "- failing attach\n");
 966                 return (ENOMEM);
 967         }
 968         xsoftc.xpt_config_hook->ich_func = xpt_config;
 969         if (config_intrhook_establish(xsoftc.xpt_config_hook) != 0) {
 970                 free (xsoftc.xpt_config_hook, M_CAMXPT);
 971                 printf("xpt_init: config_intrhook_establish failed "
 972                        "- failing attach\n");
 973         }
 974
 975         return (0);
 976 }
 977
 978 static cam_status
 979 xptregister(struct cam_periph *periph, void *arg)
 980 {
 981         struct cam_sim *xpt_sim;
 982
 983         if (periph == NULL) {
 984                 printf("xptregister: periph was NULL!!\n");
 985                 return(CAM_REQ_CMP_ERR);
 986         }
 987
 988         xpt_sim = (struct cam_sim *)arg;
 989         xpt_sim->softc = periph;
 990         xpt_periph = periph;
 991         periph->softc = NULL;
 992
 993         return(CAM_REQ_CMP);
 994 }
 995
 996 int32_t
 997 xpt_add_periph(struct cam_periph *periph)
 998 {
 999         struct cam_ed *device;
1000         int32_t  status;
1001         struct periph_list *periph_head;
1002
1003         mtx_assert(periph->sim->mtx, MA_OWNED);
1004
1005         device = periph->path->device;
1006
1007         periph_head = &device->periphs;
1008
1009         status = CAM_REQ_CMP;
1010
1011         if (device != NULL) {
1012                 /*
1013                  * Make room for this peripheral
1014                  * so it will fit in the queue
1015                  * when it's scheduled to run
1016                  */
1017                 status = camq_resize(&device->drvq,
1018                                      device->drvq.array_size + 1);
1019
1020                 device->generation++;
1021
1022                 SLIST_INSERT_HEAD(periph_head, periph, periph_links);
1023         }
1024
1025         mtx_lock(&xsoftc.xpt_topo_lock);
1026         xsoftc.xpt_generation++;
1027         mtx_unlock(&xsoftc.xpt_topo_lock);
1028
1029         return (status);
1030 }
1031
1032 void
1033 xpt_remove_periph(struct cam_periph *periph)
1034 {
1035         struct cam_ed *device;
1036
1037         mtx_assert(periph->sim->mtx, MA_OWNED);
1038
1039         device = periph->path->device;
1040
1041         if (device != NULL) {
1042                 struct periph_list *periph_head;
1043
1044                 periph_head = &device->periphs;
1045
1046                 /* Release the slot for this peripheral */
1047                 camq_resize(&device->drvq, device->drvq.array_size - 1);
1048
1049                 device->generation++;
1050
1051                 SLIST_REMOVE(periph_head, periph, cam_periph, periph_links);
1052         }
1053
1054         mtx_lock(&xsoftc.xpt_topo_lock);
1055         xsoftc.xpt_generation++;
1056         mtx_unlock(&xsoftc.xpt_topo_lock);
1057 }
1058
1059
1060 void
1061 xpt_announce_periph(struct cam_periph *periph, char *announce_string)
1062 {
1063         struct  cam_path *path = periph->path;
1064
1065         mtx_assert(periph->sim->mtx, MA_OWNED);
1066
1067         printf("%s%d at %s%d bus %d scbus%d target %d lun %d\n",
1068                periph->periph_name, periph->unit_number,
1069                path->bus->sim->sim_name,
1070                path->bus->sim->unit_number,
1071                path->bus->sim->bus_id,
1072                path->bus->path_id,
1073                path->target->target_id,
1074                path->device->lun_id);
1075         printf("%s%d: ", periph->periph_name, periph->unit_number);
1076         if (path->device->protocol == PROTO_SCSI)
1077                 scsi_print_inquiry(&path->device->inq_data);
1078         else if (path->device->protocol == PROTO_ATA ||
1079             path->device->protocol == PROTO_SATAPM)
1080                 ata_print_ident(&path->device->ident_data);
1081         else
1082                 printf("Unknown protocol device\n");
1083         if (bootverbose && path->device->serial_num_len > 0) {
1084                 /* Don't wrap the screen  - print only the first 60 chars */
1085                 printf("%s%d: Serial Number %.60s\n", periph->periph_name,
1086                        periph->unit_number, path->device->serial_num);
1087         }
1088         /* Announce transport details. */
1089         (*(path->bus->xport->announce))(periph);
1090         /* Announce command queueing. */
1091         if (path->device->inq_flags & SID_CmdQue
1092          || path->device->flags & CAM_DEV_TAG_AFTER_COUNT) {
1093                 printf("%s%d: Command Queueing enabled\n",
1094                        periph->periph_name, periph->unit_number);
1095         }
1096         /* Announce caller's details if they've passed in. */
1097         if (announce_string != NULL)
1098                 printf("%s%d: %s\n", periph->periph_name,
1099                        periph->unit_number, announce_string);
1100 }
1101
1102 static dev_match_ret
1103 xptbusmatch(struct dev_match_pattern *patterns, u_int num_patterns,
1104             struct cam_eb *bus)
1105 {
1106         dev_match_ret retval;
1107         int i;
1108
1109         retval = DM_RET_NONE;
1110
1111         /*
1112          * If we aren't given something to match against, that's an error.
1113          */
1114         if (bus == NULL)
1115                 return(DM_RET_ERROR);
1116
1117         /*
1118          * If there are no match entries, then this bus matches no
1119          * matter what.
1120          */
1121         if ((patterns == NULL) || (num_patterns == 0))
1122                 return(DM_RET_DESCEND | DM_RET_COPY);
1123
1124         for (i = 0; i < num_patterns; i++) {
1125                 struct bus_match_pattern *cur_pattern;
1126
1127                 /*
1128                  * If the pattern in question isn't for a bus node, we
1129                  * aren't interested.  However, we do indicate to the
1130                  * calling routine that we should continue descending the
1131                  * tree, since the user wants to match against lower-level
1132                  * EDT elements.
1133                  */
1134                 if (patterns[i].type != DEV_MATCH_BUS) {
1135                         if ((retval & DM_RET_ACTION_MASK) == DM_RET_NONE)
1136                                 retval |= DM_RET_DESCEND;
1137                         continue;
1138                 }
1139
1140                 cur_pattern = &patterns[i].pattern.bus_pattern;
1141
1142                 /*
1143                  * If they want to match any bus node, we give them any
1144                  * device node.
1145                  */
1146                 if (cur_pattern->flags == BUS_MATCH_ANY) {
1147                         /* set the copy flag */
1148                         retval |= DM_RET_COPY;
1149
1150                         /*
1151                          * If we've already decided on an action, go ahead
1152                          * and return.
1153                          */
1154                         if ((retval & DM_RET_ACTION_MASK) != DM_RET_NONE)
1155                                 return(retval);
1156                 }
1157
1158                 /*
1159                  * Not sure why someone would do this...
1160                  */
1161                 if (cur_pattern->flags == BUS_MATCH_NONE)
1162                         continue;
1163
1164                 if (((cur_pattern->flags & BUS_MATCH_PATH) != 0)
1165                  && (cur_pattern->path_id != bus->path_id))
1166                         continue;
1167
1168                 if (((cur_pattern->flags & BUS_MATCH_BUS_ID) != 0)
1169                  && (cur_pattern->bus_id != bus->sim->bus_id))
1170                         continue;
1171
1172                 if (((cur_pattern->flags & BUS_MATCH_UNIT) != 0)
1173                  && (cur_pattern->unit_number != bus->sim->unit_number))
1174                         continue;
1175
1176                 if (((cur_pattern->flags & BUS_MATCH_NAME) != 0)
1177                  && (strncmp(cur_pattern->dev_name, bus->sim->sim_name,
1178                              DEV_IDLEN) != 0))
1179                         continue;
1180
1181                 /*
1182                  * If we get to this point, the user definitely wants
1183                  * information on this bus.  So tell the caller to copy the
1184                  * data out.
1185                  */
1186                 retval |= DM_RET_COPY;
1187
1188                 /*
1189                  * If the return action has been set to descend, then we
1190                  * know that we've already seen a non-bus matching
1191                  * expression, therefore we need to further descend the tree.
1192                  * This won't change by continuing around the loop, so we
1193                  * go ahead and return.  If we haven't seen a non-bus
1194                  * matching expression, we keep going around the loop until
1195                  * we exhaust the matching expressions.  We'll set the stop
1196                  * flag once we fall out of the loop.
1197                  */
1198                 if ((retval & DM_RET_ACTION_MASK) == DM_RET_DESCEND)
1199                         return(retval);
1200         }
1201
1202         /*
1203          * If the return action hasn't been set to descend yet, that means
1204          * we haven't seen anything other than bus matching patterns.  So
1205          * tell the caller to stop descending the tree -- the user doesn't
1206          * want to match against lower level tree elements.
1207          */
1208         if ((retval & DM_RET_ACTION_MASK) == DM_RET_NONE)
1209                 retval |= DM_RET_STOP;
1210
1211         return(retval);
1212 }
1213
1214 static dev_match_ret
1215 xptdevicematch(struct dev_match_pattern *patterns, u_int num_patterns,
1216                struct cam_ed *device)
1217 {
1218         dev_match_ret retval;
1219         int i;
1220
1221         retval = DM_RET_NONE;
1222
1223         /*
1224          * If we aren't given something to match against, that's an error.
1225          */
1226         if (device == NULL)
1227                 return(DM_RET_ERROR);
1228
1229         /*
1230          * If there are no match entries, then this device matches no
1231          * matter what.
1232          */
1233         if ((patterns == NULL) || (num_patterns == 0))
1234                 return(DM_RET_DESCEND | DM_RET_COPY);
1235
1236         for (i = 0; i < num_patterns; i++) {
1237                 struct device_match_pattern *cur_pattern;
1238
1239                 /*
1240                  * If the pattern in question isn't for a device node, we
1241                  * aren't interested.
1242                  */
1243                 if (patterns[i].type != DEV_MATCH_DEVICE) {
1244                         if ((patterns[i].type == DEV_MATCH_PERIPH)
1245                          && ((retval & DM_RET_ACTION_MASK) == DM_RET_NONE))
1246                                 retval |= DM_RET_DESCEND;
1247                         continue;
1248                 }
1249
1250                 cur_pattern = &patterns[i].pattern.device_pattern;
1251
1252                 /*
1253                  * If they want to match any device node, we give them any
1254                  * device node.
1255                  */
1256                 if (cur_pattern->flags == DEV_MATCH_ANY) {
1257                         /* set the copy flag */
1258                         retval |= DM_RET_COPY;
1259
1260
1261                         /*
1262                          * If we've already decided on an action, go ahead
1263                          * and return.
1264                          */
1265                         if ((retval & DM_RET_ACTION_MASK) != DM_RET_NONE)
1266                                 return(retval);
1267                 }
1268
1269                 /*
1270                  * Not sure why someone would do this...
1271                  */
1272                 if (cur_pattern->flags == DEV_MATCH_NONE)
1273                         continue;
1274
1275                 if (((cur_pattern->flags & DEV_MATCH_PATH) != 0)
1276                  && (cur_pattern->path_id != device->target->bus->path_id))
1277                         continue;
1278
1279                 if (((cur_pattern->flags & DEV_MATCH_TARGET) != 0)
1280                  && (cur_pattern->target_id != device->target->target_id))
1281                         continue;
1282
1283                 if (((cur_pattern->flags & DEV_MATCH_LUN) != 0)
1284                  && (cur_pattern->target_lun != device->lun_id))
1285                         continue;
1286
1287                 if (((cur_pattern->flags & DEV_MATCH_INQUIRY) != 0)
1288                  && (cam_quirkmatch((caddr_t)&device->inq_data,
1289                                     (caddr_t)&cur_pattern->inq_pat,
1290                                     1, sizeof(cur_pattern->inq_pat),
1291                                     scsi_static_inquiry_match) == NULL))
1292                         continue;
1293
1294                 /*
1295                  * If we get to this point, the user definitely wants
1296                  * information on this device.  So tell the caller to copy
1297                  * the data out.
1298                  */
1299                 retval |= DM_RET_COPY;
1300
1301                 /*
1302                  * If the return action has been set to descend, then we
1303                  * know that we've already seen a peripheral matching
1304                  * expression, therefore we need to further descend the tree.
1305                  * This won't change by continuing around the loop, so we
1306                  * go ahead and return.  If we haven't seen a peripheral
1307                  * matching expression, we keep going around the loop until
1308                  * we exhaust the matching expressions.  We'll set the stop
1309                  * flag once we fall out of the loop.
1310                  */
1311                 if ((retval & DM_RET_ACTION_MASK) == DM_RET_DESCEND)
1312                         return(retval);
1313         }
1314
1315         /*
1316          * If the return action hasn't been set to descend yet, that means
1317          * we haven't seen any peripheral matching patterns.  So tell the
1318          * caller to stop descending the tree -- the user doesn't want to
1319          * match against lower level tree elements.
1320          */
1321         if ((retval & DM_RET_ACTION_MASK) == DM_RET_NONE)
1322                 retval |= DM_RET_STOP;
1323
1324         return(retval);
1325 }
1326
1327 /*
1328  * Match a single peripheral against any number of match patterns.
1329  */
1330 static dev_match_ret
1331 xptperiphmatch(struct dev_match_pattern *patterns, u_int num_patterns,
1332                struct cam_periph *periph)
1333 {
1334         dev_match_ret retval;
1335         int i;
1336
1337         /*
1338          * If we aren't given something to match against, that's an error.
1339          */
1340         if (periph == NULL)
1341                 return(DM_RET_ERROR);
1342
1343         /*
1344          * If there are no match entries, then this peripheral matches no
1345          * matter what.
1346          */
1347         if ((patterns == NULL) || (num_patterns == 0))
1348                 return(DM_RET_STOP | DM_RET_COPY);
1349
1350         /*
1351          * There aren't any nodes below a peripheral node, so there's no
1352          * reason to descend the tree any further.
1353          */
1354         retval = DM_RET_STOP;
1355
1356         for (i = 0; i < num_patterns; i++) {
1357                 struct periph_match_pattern *cur_pattern;
1358
1359                 /*
1360                  * If the pattern in question isn't for a peripheral, we
1361                  * aren't interested.
1362                  */
1363                 if (patterns[i].type != DEV_MATCH_PERIPH)
1364                         continue;
1365
1366                 cur_pattern = &patterns[i].pattern.periph_pattern;
1367
1368                 /*
1369                  * If they want to match on anything, then we will do so.
1370                  */
1371                 if (cur_pattern->flags == PERIPH_MATCH_ANY) {
1372                         /* set the copy flag */
1373                         retval |= DM_RET_COPY;
1374
1375                         /*
1376                          * We've already set the return action to stop,
1377                          * since there are no nodes below peripherals in
1378                          * the tree.
1379                          */
1380                         return(retval);
1381                 }
1382
1383                 /*
1384                  * Not sure why someone would do this...
1385                  */
1386                 if (cur_pattern->flags == PERIPH_MATCH_NONE)
1387                         continue;
1388
1389                 if (((cur_pattern->flags & PERIPH_MATCH_PATH) != 0)
1390                  && (cur_pattern->path_id != periph->path->bus->path_id))
1391                         continue;
1392
1393                 /*
1394                  * For the target and lun id's, we have to make sure the
1395                  * target and lun pointers aren't NULL.  The xpt peripheral
1396                  * has a wildcard target and device.
1397                  */
1398                 if (((cur_pattern->flags & PERIPH_MATCH_TARGET) != 0)
1399                  && ((periph->path->target == NULL)
1400                  ||(cur_pattern->target_id != periph->path->target->target_id)))
1401                         continue;
1402
1403                 if (((cur_pattern->flags & PERIPH_MATCH_LUN) != 0)
1404                  && ((periph->path->device == NULL)
1405                  || (cur_pattern->target_lun != periph->path->device->lun_id)))
1406                         continue;
1407
1408                 if (((cur_pattern->flags & PERIPH_MATCH_UNIT) != 0)
1409                  && (cur_pattern->unit_number != periph->unit_number))
1410                         continue;
1411
1412                 if (((cur_pattern->flags & PERIPH_MATCH_NAME) != 0)
1413                  && (strncmp(cur_pattern->periph_name, periph->periph_name,
1414                              DEV_IDLEN) != 0))
1415                         continue;
1416
1417                 /*
1418                  * If we get to this point, the user definitely wants
1419                  * information on this peripheral.  So tell the caller to
1420                  * copy the data out.
1421                  */
1422                 retval |= DM_RET_COPY;
1423
1424                 /*
1425                  * The return action has already been set to stop, since
1426                  * peripherals don't have any nodes below them in the EDT.
1427                  */
1428                 return(retval);
1429         }
1430
1431         /*
1432          * If we get to this point, the peripheral that was passed in
1433          * doesn't match any of the patterns.
1434          */
1435         return(retval);
1436 }
1437
1438 static int
1439 xptedtbusfunc(struct cam_eb *bus, void *arg)
1440 {
1441         struct ccb_dev_match *cdm;
1442         dev_match_ret retval;
1443
1444         cdm = (struct ccb_dev_match *)arg;
1445
1446         /*
1447          * If our position is for something deeper in the tree, that means
1448          * that we've already seen this node.  So, we keep going down.
1449          */
1450         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
1451          && (cdm->pos.cookie.bus == bus)
1452          && (cdm->pos.position_type & CAM_DEV_POS_TARGET)
1453          && (cdm->pos.cookie.target != NULL))
1454                 retval = DM_RET_DESCEND;
1455         else
1456                 retval = xptbusmatch(cdm->patterns, cdm->num_patterns, bus);
1457
1458         /*
1459          * If we got an error, bail out of the search.
1460          */
1461         if ((retval & DM_RET_ACTION_MASK) == DM_RET_ERROR) {
1462                 cdm->status = CAM_DEV_MATCH_ERROR;
1463                 return(0);
1464         }
1465
1466         /*
1467          * If the copy flag is set, copy this bus out.
1468          */
1469         if (retval & DM_RET_COPY) {
1470                 int spaceleft, j;
1471
1472                 spaceleft = cdm->match_buf_len - (cdm->num_matches *
1473                         sizeof(struct dev_match_result));
1474
1475                 /*
1476                  * If we don't have enough space to put in another
1477                  * match result, save our position and tell the
1478                  * user there are more devices to check.
1479                  */
1480                 if (spaceleft < sizeof(struct dev_match_result)) {
1481                         bzero(&cdm->pos, sizeof(cdm->pos));
1482                         cdm->pos.position_type =
1483                                 CAM_DEV_POS_EDT | CAM_DEV_POS_BUS;
1484
1485                         cdm->pos.cookie.bus = bus;
1486                         cdm->pos.generations[CAM_BUS_GENERATION]=
1487                                 xsoftc.bus_generation;
1488                         cdm->status = CAM_DEV_MATCH_MORE;
1489                         return(0);
1490                 }
1491                 j = cdm->num_matches;
1492                 cdm->num_matches++;
1493                 cdm->matches[j].type = DEV_MATCH_BUS;
1494                 cdm->matches[j].result.bus_result.path_id = bus->path_id;
1495                 cdm->matches[j].result.bus_result.bus_id = bus->sim->bus_id;
1496                 cdm->matches[j].result.bus_result.unit_number =
1497                         bus->sim->unit_number;
1498                 strncpy(cdm->matches[j].result.bus_result.dev_name,
1499                         bus->sim->sim_name, DEV_IDLEN);
1500         }
1501
1502         /*
1503          * If the user is only interested in busses, there's no
1504          * reason to descend to the next level in the tree.
1505          */
1506         if ((retval & DM_RET_ACTION_MASK) == DM_RET_STOP)
1507                 return(1);
1508
1509         /*
1510          * If there is a target generation recorded, check it to
1511          * make sure the target list hasn't changed.
1512          */
1513         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
1514          && (bus == cdm->pos.cookie.bus)
1515          && (cdm->pos.position_type & CAM_DEV_POS_TARGET)
1516          && (cdm->pos.generations[CAM_TARGET_GENERATION] != 0)
1517          && (cdm->pos.generations[CAM_TARGET_GENERATION] !=
1518              bus->generation)) {
1519                 cdm->status = CAM_DEV_MATCH_LIST_CHANGED;
1520                 return(0);
1521         }
1522
1523         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
1524          && (cdm->pos.cookie.bus == bus)
1525          && (cdm->pos.position_type & CAM_DEV_POS_TARGET)
1526          && (cdm->pos.cookie.target != NULL))
1527                 return(xpttargettraverse(bus,
1528                                         (struct cam_et *)cdm->pos.cookie.target,
1529                                          xptedttargetfunc, arg));
1530         else
1531                 return(xpttargettraverse(bus, NULL, xptedttargetfunc, arg));
1532 }
1533
1534 static int
1535 xptedttargetfunc(struct cam_et *target, void *arg)
1536 {
1537         struct ccb_dev_match *cdm;
1538
1539         cdm = (struct ccb_dev_match *)arg;
1540
1541         /*
1542          * If there is a device list generation recorded, check it to
1543          * make sure the device list hasn't changed.
1544          */
1545         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
1546          && (cdm->pos.cookie.bus == target->bus)
1547          && (cdm->pos.position_type & CAM_DEV_POS_TARGET)
1548          && (cdm->pos.cookie.target == target)
1549          && (cdm->pos.position_type & CAM_DEV_POS_DEVICE)
1550          && (cdm->pos.generations[CAM_DEV_GENERATION] != 0)
1551          && (cdm->pos.generations[CAM_DEV_GENERATION] !=
1552              target->generation)) {
1553                 cdm->status = CAM_DEV_MATCH_LIST_CHANGED;
1554                 return(0);
1555         }
1556
1557         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
1558          && (cdm->pos.cookie.bus == target->bus)
1559          && (cdm->pos.position_type & CAM_DEV_POS_TARGET)
1560          && (cdm->pos.cookie.target == target)
1561          && (cdm->pos.position_type & CAM_DEV_POS_DEVICE)
1562          && (cdm->pos.cookie.device != NULL))
1563                 return(xptdevicetraverse(target,
1564                                         (struct cam_ed *)cdm->pos.cookie.device,
1565                                          xptedtdevicefunc, arg));
1566         else
1567                 return(xptdevicetraverse(target, NULL, xptedtdevicefunc, arg));
1568 }
1569
1570 static int
1571 xptedtdevicefunc(struct cam_ed *device, void *arg)
1572 {
1573
1574         struct ccb_dev_match *cdm;
1575         dev_match_ret retval;
1576
1577         cdm = (struct ccb_dev_match *)arg;
1578
1579         /*
1580          * If our position is for something deeper in the tree, that means
1581          * that we've already seen this node.  So, we keep going down.
1582          */
1583         if ((cdm->pos.position_type & CAM_DEV_POS_DEVICE)
1584          && (cdm->pos.cookie.device == device)
1585          && (cdm->pos.position_type & CAM_DEV_POS_PERIPH)
1586          && (cdm->pos.cookie.periph != NULL))
1587                 retval = DM_RET_DESCEND;
1588         else
1589                 retval = xptdevicematch(cdm->patterns, cdm->num_patterns,
1590                                         device);
1591
1592         if ((retval & DM_RET_ACTION_MASK) == DM_RET_ERROR) {
1593                 cdm->status = CAM_DEV_MATCH_ERROR;
1594                 return(0);
1595         }
1596
1597         /*
1598          * If the copy flag is set, copy this device out.
1599          */
1600         if (retval & DM_RET_COPY) {
1601                 int spaceleft, j;
1602
1603                 spaceleft = cdm->match_buf_len - (cdm->num_matches *
1604                         sizeof(struct dev_match_result));
1605
1606                 /*
1607                  * If we don't have enough space to put in another
1608                  * match result, save our position and tell the
1609                  * user there are more devices to check.
1610                  */
1611                 if (spaceleft < sizeof(struct dev_match_result)) {
1612                         bzero(&cdm->pos, sizeof(cdm->pos));
1613                         cdm->pos.position_type =
1614                                 CAM_DEV_POS_EDT | CAM_DEV_POS_BUS |
1615                                 CAM_DEV_POS_TARGET | CAM_DEV_POS_DEVICE;
1616
1617                         cdm->pos.cookie.bus = device->target->bus;
1618                         cdm->pos.generations[CAM_BUS_GENERATION]=
1619                                 xsoftc.bus_generation;
1620                         cdm->pos.cookie.target = device->target;
1621                         cdm->pos.generations[CAM_TARGET_GENERATION] =
1622                                 device->target->bus->generation;
1623                         cdm->pos.cookie.device = device;
1624                         cdm->pos.generations[CAM_DEV_GENERATION] =
1625                                 device->target->generation;
1626                         cdm->status = CAM_DEV_MATCH_MORE;
1627                         return(0);
1628                 }
1629                 j = cdm->num_matches;
1630                 cdm->num_matches++;
1631                 cdm->matches[j].type = DEV_MATCH_DEVICE;
1632                 cdm->matches[j].result.device_result.path_id =
1633                         device->target->bus->path_id;
1634                 cdm->matches[j].result.device_result.target_id =
1635                         device->target->target_id;
1636                 cdm->matches[j].result.device_result.target_lun =
1637                         device->lun_id;
1638                 cdm->matches[j].result.device_result.protocol =
1639                         device->protocol;
1640                 bcopy(&device->inq_data,
1641                       &cdm->matches[j].result.device_result.inq_data,
1642                       sizeof(struct scsi_inquiry_data));
1643                 bcopy(&device->ident_data,
1644                       &cdm->matches[j].result.device_result.ident_data,
1645                       sizeof(struct ata_params));
1646
1647                 /* Let the user know whether this device is unconfigured */
1648                 if (device->flags & CAM_DEV_UNCONFIGURED)
1649                         cdm->matches[j].result.device_result.flags =
1650                                 DEV_RESULT_UNCONFIGURED;
1651                 else
1652                         cdm->matches[j].result.device_result.flags =
1653                                 DEV_RESULT_NOFLAG;
1654         }
1655
1656         /*
1657          * If the user isn't interested in peripherals, don't descend
1658          * the tree any further.
1659          */
1660         if ((retval & DM_RET_ACTION_MASK) == DM_RET_STOP)
1661                 return(1);
1662
1663         /*
1664          * If there is a peripheral list generation recorded, make sure
1665          * it hasn't changed.
1666          */
1667         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
1668          && (device->target->bus == cdm->pos.cookie.bus)
1669          && (cdm->pos.position_type & CAM_DEV_POS_TARGET)
1670          && (device->target == cdm->pos.cookie.target)
1671          && (cdm->pos.position_type & CAM_DEV_POS_DEVICE)
1672          && (device == cdm->pos.cookie.device)
1673          && (cdm->pos.position_type & CAM_DEV_POS_PERIPH)
1674          && (cdm->pos.generations[CAM_PERIPH_GENERATION] != 0)
1675          && (cdm->pos.generations[CAM_PERIPH_GENERATION] !=
1676              device->generation)){
1677                 cdm->status = CAM_DEV_MATCH_LIST_CHANGED;
1678                 return(0);
1679         }
1680
1681         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
1682          && (cdm->pos.cookie.bus == device->target->bus)
1683          && (cdm->pos.position_type & CAM_DEV_POS_TARGET)
1684          && (cdm->pos.cookie.target == device->target)
1685          && (cdm->pos.position_type & CAM_DEV_POS_DEVICE)
1686          && (cdm->pos.cookie.device == device)
1687          && (cdm->pos.position_type & CAM_DEV_POS_PERIPH)
1688          && (cdm->pos.cookie.periph != NULL))
1689                 return(xptperiphtraverse(device,
1690                                 (struct cam_periph *)cdm->pos.cookie.periph,
1691                                 xptedtperiphfunc, arg));
1692         else
1693                 return(xptperiphtraverse(device, NULL, xptedtperiphfunc, arg));
1694 }
1695
1696 static int
1697 xptedtperiphfunc(struct cam_periph *periph, void *arg)
1698 {
1699         struct ccb_dev_match *cdm;
1700         dev_match_ret retval;
1701
1702         cdm = (struct ccb_dev_match *)arg;
1703
1704         retval = xptperiphmatch(cdm->patterns, cdm->num_patterns, periph);
1705
1706         if ((retval & DM_RET_ACTION_MASK) == DM_RET_ERROR) {
1707                 cdm->status = CAM_DEV_MATCH_ERROR;
1708                 return(0);
1709         }
1710
1711         /*
1712          * If the copy flag is set, copy this peripheral out.
1713          */
1714         if (retval & DM_RET_COPY) {
1715                 int spaceleft, j;
1716
1717                 spaceleft = cdm->match_buf_len - (cdm->num_matches *
1718                         sizeof(struct dev_match_result));
1719
1720                 /*
1721                  * If we don't have enough space to put in another
1722                  * match result, save our position and tell the
1723                  * user there are more devices to check.
1724                  */
1725                 if (spaceleft < sizeof(struct dev_match_result)) {
1726                         bzero(&cdm->pos, sizeof(cdm->pos));
1727                         cdm->pos.position_type =
1728                                 CAM_DEV_POS_EDT | CAM_DEV_POS_BUS |
1729                                 CAM_DEV_POS_TARGET | CAM_DEV_POS_DEVICE |
1730                                 CAM_DEV_POS_PERIPH;
1731
1732                         cdm->pos.cookie.bus = periph->path->bus;
1733                         cdm->pos.generations[CAM_BUS_GENERATION]=
1734                                 xsoftc.bus_generation;
1735                         cdm->pos.cookie.target = periph->path->target;
1736                         cdm->pos.generations[CAM_TARGET_GENERATION] =
1737                                 periph->path->bus->generation;
1738                         cdm->pos.cookie.device = periph->path->device;
1739                         cdm->pos.generations[CAM_DEV_GENERATION] =
1740                                 periph->path->target->generation;
1741                         cdm->pos.cookie.periph = periph;
1742                         cdm->pos.generations[CAM_PERIPH_GENERATION] =
1743                                 periph->path->device->generation;
1744                         cdm->status = CAM_DEV_MATCH_MORE;
1745                         return(0);
1746                 }
1747
1748                 j = cdm->num_matches;
1749                 cdm->num_matches++;
1750                 cdm->matches[j].type = DEV_MATCH_PERIPH;
1751                 cdm->matches[j].result.periph_result.path_id =
1752                         periph->path->bus->path_id;
1753                 cdm->matches[j].result.periph_result.target_id =
1754                         periph->path->target->target_id;
1755                 cdm->matches[j].result.periph_result.target_lun =
1756                         periph->path->device->lun_id;
1757                 cdm->matches[j].result.periph_result.unit_number =
1758                         periph->unit_number;
1759                 strncpy(cdm->matches[j].result.periph_result.periph_name,
1760                         periph->periph_name, DEV_IDLEN);
1761         }
1762
1763         return(1);
1764 }
1765
1766 static int
1767 xptedtmatch(struct ccb_dev_match *cdm)
1768 {
1769         int ret;
1770
1771         cdm->num_matches = 0;
1772
1773         /*
1774          * Check the bus list generation.  If it has changed, the user
1775          * needs to reset everything and start over.
1776          */
1777         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
1778          && (cdm->pos.generations[CAM_BUS_GENERATION] != 0)
1779          && (cdm->pos.generations[CAM_BUS_GENERATION] != xsoftc.bus_generation)) {
1780                 cdm->status = CAM_DEV_MATCH_LIST_CHANGED;
1781                 return(0);
1782         }
1783
1784         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
1785          && (cdm->pos.cookie.bus != NULL))
1786                 ret = xptbustraverse((struct cam_eb *)cdm->pos.cookie.bus,
1787                                      xptedtbusfunc, cdm);
1788         else
1789                 ret = xptbustraverse(NULL, xptedtbusfunc, cdm);
1790
1791         /*
1792          * If we get back 0, that means that we had to stop before fully
1793          * traversing the EDT.  It also means that one of the subroutines
1794          * has set the status field to the proper value.  If we get back 1,
1795          * we've fully traversed the EDT and copied out any matching entries.
1796          */
1797         if (ret == 1)
1798                 cdm->status = CAM_DEV_MATCH_LAST;
1799
1800         return(ret);
1801 }
1802
1803 static int
1804 xptplistpdrvfunc(struct periph_driver **pdrv, void *arg)
1805 {
1806         struct ccb_dev_match *cdm;
1807
1808         cdm = (struct ccb_dev_match *)arg;
1809
1810         if ((cdm->pos.position_type & CAM_DEV_POS_PDPTR)
1811          && (cdm->pos.cookie.pdrv == pdrv)
1812          && (cdm->pos.position_type & CAM_DEV_POS_PERIPH)
1813          && (cdm->pos.generations[CAM_PERIPH_GENERATION] != 0)
1814          && (cdm->pos.generations[CAM_PERIPH_GENERATION] !=
1815              (*pdrv)->generation)) {
1816                 cdm->status = CAM_DEV_MATCH_LIST_CHANGED;
1817                 return(0);
1818         }
1819
1820         if ((cdm->pos.position_type & CAM_DEV_POS_PDPTR)
1821          && (cdm->pos.cookie.pdrv == pdrv)
1822          && (cdm->pos.position_type & CAM_DEV_POS_PERIPH)
1823          && (cdm->pos.cookie.periph != NULL))
1824                 return(xptpdperiphtraverse(pdrv,
1825                                 (struct cam_periph *)cdm->pos.cookie.periph,
1826                                 xptplistperiphfunc, arg));
1827         else
1828                 return(xptpdperiphtraverse(pdrv, NULL,xptplistperiphfunc, arg));
1829 }
1830
1831 static int
1832 xptplistperiphfunc(struct cam_periph *periph, void *arg)
1833 {
1834         struct ccb_dev_match *cdm;
1835         dev_match_ret retval;
1836
1837         cdm = (struct ccb_dev_match *)arg;
1838
1839         retval = xptperiphmatch(cdm->patterns, cdm->num_patterns, periph);
1840
1841         if ((retval & DM_RET_ACTION_MASK) == DM_RET_ERROR) {
1842                 cdm->status = CAM_DEV_MATCH_ERROR;
1843                 return(0);
1844         }
1845
1846         /*
1847          * If the copy flag is set, copy this peripheral out.
1848          */
1849         if (retval & DM_RET_COPY) {
1850                 int spaceleft, j;
1851
1852                 spaceleft = cdm->match_buf_len - (cdm->num_matches *
1853                         sizeof(struct dev_match_result));
1854
1855                 /*
1856                  * If we don't have enough space to put in another
1857                  * match result, save our position and tell the
1858                  * user there are more devices to check.
1859                  */
1860                 if (spaceleft < sizeof(struct dev_match_result)) {
1861                         struct periph_driver **pdrv;
1862
1863                         pdrv = NULL;
1864                         bzero(&cdm->pos, sizeof(cdm->pos));
1865                         cdm->pos.position_type =
1866                                 CAM_DEV_POS_PDRV | CAM_DEV_POS_PDPTR |
1867                                 CAM_DEV_POS_PERIPH;
1868
1869                         /*
1870                          * This may look a bit non-sensical, but it is
1871                          * actually quite logical.  There are very few
1872                          * peripheral drivers, and bloating every peripheral
1873                          * structure with a pointer back to its parent
1874                          * peripheral driver linker set entry would cost
1875                          * more in the long run than doing this quick lookup.
1876                          */
1877                         for (pdrv = periph_drivers; *pdrv != NULL; pdrv++) {
1878                                 if (strcmp((*pdrv)->driver_name,
1879                                     periph->periph_name) == 0)
1880                                         break;
1881                         }
1882
1883                         if (*pdrv == NULL) {
1884                                 cdm->status = CAM_DEV_MATCH_ERROR;
1885                                 return(0);
1886                         }
1887
1888                         cdm->pos.cookie.pdrv = pdrv;
1889                         /*
1890                          * The periph generation slot does double duty, as
1891                          * does the periph pointer slot.  They are used for
1892                          * both edt and pdrv lookups and positioning.
1893                          */
1894                         cdm->pos.cookie.periph = periph;
1895                         cdm->pos.generations[CAM_PERIPH_GENERATION] =
1896                                 (*pdrv)->generation;
1897                         cdm->status = CAM_DEV_MATCH_MORE;
1898                         return(0);
1899                 }
1900
1901                 j = cdm->num_matches;
1902                 cdm->num_matches++;
1903                 cdm->matches[j].type = DEV_MATCH_PERIPH;
1904                 cdm->matches[j].result.periph_result.path_id =
1905                         periph->path->bus->path_id;
1906
1907                 /*
1908                  * The transport layer peripheral doesn't have a target or
1909                  * lun.
1910                  */
1911                 if (periph->path->target)
1912                         cdm->matches[j].result.periph_result.target_id =
1913                                 periph->path->target->target_id;
1914                 else
1915                         cdm->matches[j].result.periph_result.target_id = -1;
1916
1917                 if (periph->path->device)
1918                         cdm->matches[j].result.periph_result.target_lun =
1919                                 periph->path->device->lun_id;
1920                 else
1921                         cdm->matches[j].result.periph_result.target_lun = -1;
1922
1923                 cdm->matches[j].result.periph_result.unit_number =
1924                         periph->unit_number;
1925                 strncpy(cdm->matches[j].result.periph_result.periph_name,
1926                         periph->periph_name, DEV_IDLEN);
1927         }
1928
1929         return(1);
1930 }
1931
1932 static int
1933 xptperiphlistmatch(struct ccb_dev_match *cdm)
1934 {
1935         int ret;
1936
1937         cdm->num_matches = 0;
1938
1939         /*
1940          * At this point in the edt traversal function, we check the bus
1941          * list generation to make sure that no busses have been added or
1942          * removed since the user last sent a XPT_DEV_MATCH ccb through.
1943          * For the peripheral driver list traversal function, however, we
1944          * don't have to worry about new peripheral driver types coming or
1945          * going; they're in a linker set, and therefore can't change
1946          * without a recompile.
1947          */
1948
1949         if ((cdm->pos.position_type & CAM_DEV_POS_PDPTR)
1950          && (cdm->pos.cookie.pdrv != NULL))
1951                 ret = xptpdrvtraverse(
1952                                 (struct periph_driver **)cdm->pos.cookie.pdrv,
1953                                 xptplistpdrvfunc, cdm);
1954         else
1955                 ret = xptpdrvtraverse(NULL, xptplistpdrvfunc, cdm);
1956
1957         /*
1958          * If we get back 0, that means that we had to stop before fully
1959          * traversing the peripheral driver tree.  It also means that one of
1960          * the subroutines has set the status field to the proper value.  If
1961          * we get back 1, we've fully traversed the EDT and copied out any
1962          * matching entries.
1963          */
1964         if (ret == 1)
1965                 cdm->status = CAM_DEV_MATCH_LAST;
1966
1967         return(ret);
1968 }
1969
1970 static int
1971 xptbustraverse(struct cam_eb *start_bus, xpt_busfunc_t *tr_func, void *arg)
1972 {
1973         struct cam_eb *bus, *next_bus;
1974         int retval;
1975
1976         retval = 1;
1977
1978         mtx_lock(&xsoftc.xpt_topo_lock);
1979         for (bus = (start_bus ? start_bus : TAILQ_FIRST(&xsoftc.xpt_busses));
1980              bus != NULL;
1981              bus = next_bus) {
1982
1983                 bus->refcount++;
1984
1985                 /*
1986                  * XXX The locking here is obviously very complex.  We
1987                  * should work to simplify it.
1988                  */
1989                 mtx_unlock(&xsoftc.xpt_topo_lock);
1990                 CAM_SIM_LOCK(bus->sim);
1991                 retval = tr_func(bus, arg);
1992                 CAM_SIM_UNLOCK(bus->sim);
1993
1994                 mtx_lock(&xsoftc.xpt_topo_lock);
1995                 next_bus = TAILQ_NEXT(bus, links);
1996                 mtx_unlock(&xsoftc.xpt_topo_lock);
1997
1998                 xpt_release_bus(bus);
1999
2000                 if (retval == 0)
2001                         return(retval);
2002                 mtx_lock(&xsoftc.xpt_topo_lock);
2003         }
2004         mtx_unlock(&xsoftc.xpt_topo_lock);
2005
2006         return(retval);
2007 }
2008
2009 int
2010 xpt_sim_opened(struct cam_sim *sim)
2011 {
2012         struct cam_eb *bus;
2013         struct cam_et *target;
2014         struct cam_ed *device;
2015         struct cam_periph *periph;
2016
2017         KASSERT(sim->refcount >= 1, ("sim->refcount >= 1"));
2018         mtx_assert(sim->mtx, MA_OWNED);
2019
2020         mtx_lock(&xsoftc.xpt_topo_lock);
2021         TAILQ_FOREACH(bus, &xsoftc.xpt_busses, links) {
2022                 if (bus->sim != sim)
2023                         continue;
2024
2025                 TAILQ_FOREACH(target, &bus->et_entries, links) {
2026                         TAILQ_FOREACH(device, &target->ed_entries, links) {
2027                                 SLIST_FOREACH(periph, &device->periphs,
2028                                     periph_links) {
2029                                         if (periph->refcount > 0) {
2030                                                 mtx_unlock(&xsoftc.xpt_topo_lock);
2031                                                 return (1);
2032                                         }
2033                                 }
2034                         }
2035                 }
2036         }
2037
2038         mtx_unlock(&xsoftc.xpt_topo_lock);
2039         return (0);
2040 }
2041
2042 static int
2043 xpttargettraverse(struct cam_eb *bus, struct cam_et *start_target,
2044                   xpt_targetfunc_t *tr_func, void *arg)
2045 {
2046         struct cam_et *target, *next_target;
2047         int retval;
2048
2049         retval = 1;
2050         for (target = (start_target ? start_target :
2051                        TAILQ_FIRST(&bus->et_entries));
2052              target != NULL; target = next_target) {
2053
2054                 target->refcount++;
2055
2056                 retval = tr_func(target, arg);
2057
2058                 next_target = TAILQ_NEXT(target, links);
2059
2060                 xpt_release_target(target);
2061
2062                 if (retval == 0)
2063                         return(retval);
2064         }
2065
2066         return(retval);
2067 }
2068
2069 static int
2070 xptdevicetraverse(struct cam_et *target, struct cam_ed *start_device,
2071                   xpt_devicefunc_t *tr_func, void *arg)
2072 {
2073         struct cam_ed *device, *next_device;
2074         int retval;
2075
2076         retval = 1;
2077         for (device = (start_device ? start_device :
2078                        TAILQ_FIRST(&target->ed_entries));
2079              device != NULL;
2080              device = next_device) {
2081
2082                 /*
2083                  * Hold a reference so the current device does not go away
2084                  * on us.
2085                  */
2086                 device->refcount++;
2087
2088                 retval = tr_func(device, arg);
2089
2090                 /*
2091                  * Grab our next pointer before we release the current
2092                  * device.
2093                  */
2094                 next_device = TAILQ_NEXT(device, links);
2095
2096                 xpt_release_device(device);
2097
2098                 if (retval == 0)
2099                         return(retval);
2100         }
2101
2102         return(retval);
2103 }
2104
2105 static int
2106 xptperiphtraverse(struct cam_ed *device, struct cam_periph *start_periph,
2107                   xpt_periphfunc_t *tr_func, void *arg)
2108 {
2109         struct cam_periph *periph, *next_periph;
2110         int retval;
2111
2112         retval = 1;
2113
2114         xpt_lock_buses();
2115         for (periph = (start_periph ? start_periph :
2116                        SLIST_FIRST(&device->periphs));
2117              periph != NULL;
2118              periph = next_periph) {
2119
2120
2121                 /*
2122                  * In this case, we want to show peripherals that have been
2123                  * invalidated, but not peripherals that are scheduled to
2124                  * be freed.  So instead of calling cam_periph_acquire(),
2125                  * which will fail if the periph has been invalidated, we
2126                  * just check for the free flag here.  If it is free, we
2127                  * skip to the next periph.
2128                  */
2129                 if (periph->flags & CAM_PERIPH_FREE) {
2130                         next_periph = SLIST_NEXT(periph, periph_links);
2131                         continue;
2132                 }
2133
2134                 /*
2135                  * Acquire a reference to this periph while we call the
2136                  * traversal function, so it can't go away.
2137                  */
2138                 periph->refcount++;
2139
2140                 xpt_unlock_buses();
2141
2142                 retval = tr_func(periph, arg);
2143
2144                 /*
2145                  * We need the lock for list traversal.
2146                  */
2147                 xpt_lock_buses();
2148
2149                 /*
2150                  * Grab the next peripheral before we release this one, so
2151                  * our next pointer is still valid.
2152                  */
2153                 next_periph = SLIST_NEXT(periph, periph_links);
2154
2155                 cam_periph_release_locked_buses(periph);
2156
2157                 if (retval == 0)
2158                         goto bailout_done;
2159         }
2160
2161 bailout_done:
2162
2163         xpt_unlock_buses();
2164
2165         return(retval);
2166 }
2167
2168 static int
2169 xptpdrvtraverse(struct periph_driver **start_pdrv,
2170                 xpt_pdrvfunc_t *tr_func, void *arg)
2171 {
2172         struct periph_driver **pdrv;
2173         int retval;
2174
2175         retval = 1;
2176
2177         /*
2178          * We don't traverse the peripheral driver list like we do the
2179          * other lists, because it is a linker set, and therefore cannot be
2180          * changed during runtime.  If the peripheral driver list is ever
2181          * re-done to be something other than a linker set (i.e. it can
2182          * change while the system is running), the list traversal should
2183          * be modified to work like the other traversal functions.
2184          */
2185         for (pdrv = (start_pdrv ? start_pdrv : periph_drivers);
2186              *pdrv != NULL; pdrv++) {
2187                 retval = tr_func(pdrv, arg);
2188
2189                 if (retval == 0)
2190                         return(retval);
2191         }
2192
2193         return(retval);
2194 }
2195
2196 static int
2197 xptpdperiphtraverse(struct periph_driver **pdrv,
2198                     struct cam_periph *start_periph,
2199                     xpt_periphfunc_t *tr_func, void *arg)
2200 {
2201         struct cam_periph *periph, *next_periph;
2202         int retval;
2203
2204         retval = 1;
2205
2206         xpt_lock_buses();
2207         for (periph = (start_periph ? start_periph :
2208              TAILQ_FIRST(&(*pdrv)->units)); periph != NULL;
2209              periph = next_periph) {
2210
2211
2212                 /*
2213                  * In this case, we want to show peripherals that have been
2214                  * invalidated, but not peripherals that are scheduled to
2215                  * be freed.  So instead of calling cam_periph_acquire(),
2216                  * which will fail if the periph has been invalidated, we
2217                  * just check for the free flag here.  If it is free, we
2218                  * skip to the next periph.
2219                  */
2220                 if (periph->flags & CAM_PERIPH_FREE) {
2221                         next_periph = TAILQ_NEXT(periph, unit_links);
2222                         continue;
2223                 }
2224
2225                 /*
2226                  * Acquire a reference to this periph while we call the
2227                  * traversal function, so it can't go away.
2228                  */
2229                 periph->refcount++;
2230
2231                 /*
2232                  * XXX KDM we have the toplogy lock here, but in
2233                  * xptperiphtraverse(), we drop it before calling the
2234                  * traversal function.  Which is correct?
2235                  */
2236                 retval = tr_func(periph, arg);
2237
2238                 /*
2239                  * Grab the next peripheral before we release this one, so
2240                  * our next pointer is still valid.
2241                  */
2242                 next_periph = TAILQ_NEXT(periph, unit_links);
2243
2244                 cam_periph_release_locked_buses(periph);
2245
2246                 if (retval == 0)
2247                         goto bailout_done;
2248         }
2249 bailout_done:
2250
2251         xpt_unlock_buses();
2252
2253         return(retval);
2254 }
2255
2256 static int
2257 xptdefbusfunc(struct cam_eb *bus, void *arg)
2258 {
2259         struct xpt_traverse_config *tr_config;
2260
2261         tr_config = (struct xpt_traverse_config *)arg;
2262
2263         if (tr_config->depth == XPT_DEPTH_BUS) {
2264                 xpt_busfunc_t *tr_func;
2265
2266                 tr_func = (xpt_busfunc_t *)tr_config->tr_func;
2267
2268                 return(tr_func(bus, tr_config->tr_arg));
2269         } else
2270                 return(xpttargettraverse(bus, NULL, xptdeftargetfunc, arg));
2271 }
2272
2273 static int
2274 xptdeftargetfunc(struct cam_et *target, void *arg)
2275 {
2276         struct xpt_traverse_config *tr_config;
2277
2278         tr_config = (struct xpt_traverse_config *)arg;
2279
2280         if (tr_config->depth == XPT_DEPTH_TARGET) {
2281                 xpt_targetfunc_t *tr_func;
2282
2283                 tr_func = (xpt_targetfunc_t *)tr_config->tr_func;
2284
2285                 return(tr_func(target, tr_config->tr_arg));
2286         } else
2287                 return(xptdevicetraverse(target, NULL, xptdefdevicefunc, arg));
2288 }
2289
2290 static int
2291 xptdefdevicefunc(struct cam_ed *device, void *arg)
2292 {
2293         struct xpt_traverse_config *tr_config;
2294
2295         tr_config = (struct xpt_traverse_config *)arg;
2296
2297         if (tr_config->depth == XPT_DEPTH_DEVICE) {
2298                 xpt_devicefunc_t *tr_func;
2299
2300                 tr_func = (xpt_devicefunc_t *)tr_config->tr_func;
2301
2302                 return(tr_func(device, tr_config->tr_arg));
2303         } else
2304                 return(xptperiphtraverse(device, NULL, xptdefperiphfunc, arg));
2305 }
2306
2307 static int
2308 xptdefperiphfunc(struct cam_periph *periph, void *arg)
2309 {
2310         struct xpt_traverse_config *tr_config;
2311         xpt_periphfunc_t *tr_func;
2312
2313         tr_config = (struct xpt_traverse_config *)arg;
2314
2315         tr_func = (xpt_periphfunc_t *)tr_config->tr_func;
2316
2317         /*
2318          * Unlike the other default functions, we don't check for depth
2319          * here.  The peripheral driver level is the last level in the EDT,
2320          * so if we're here, we should execute the function in question.
2321          */
2322         return(tr_func(periph, tr_config->tr_arg));
2323 }
2324
2325 /*
2326  * Execute the given function for every bus in the EDT.
2327  */
2328 static int
2329 xpt_for_all_busses(xpt_busfunc_t *tr_func, void *arg)
2330 {
2331         struct xpt_traverse_config tr_config;
2332
2333         tr_config.depth = XPT_DEPTH_BUS;
2334         tr_config.tr_func = tr_func;
2335         tr_config.tr_arg = arg;
2336
2337         return(xptbustraverse(NULL, xptdefbusfunc, &tr_config));
2338 }
2339
2340 /*
2341  * Execute the given function for every device in the EDT.
2342  */
2343 static int
2344 xpt_for_all_devices(xpt_devicefunc_t *tr_func, void *arg)
2345 {
2346         struct xpt_traverse_config tr_config;
2347
2348         tr_config.depth = XPT_DEPTH_DEVICE;
2349         tr_config.tr_func = tr_func;
2350         tr_config.tr_arg = arg;
2351
2352         return(xptbustraverse(NULL, xptdefbusfunc, &tr_config));
2353 }
2354
2355 static int
2356 xptsetasyncfunc(struct cam_ed *device, void *arg)
2357 {
2358         struct cam_path path;
2359         struct ccb_getdev cgd;
2360         struct ccb_setasync *csa = (struct ccb_setasync *)arg;
2361
2362         /*
2363          * Don't report unconfigured devices (Wildcard devs,
2364          * devices only for target mode, device instances
2365          * that have been invalidated but are waiting for
2366          * their last reference count to be released).
2367          */
2368         if ((device->flags & CAM_DEV_UNCONFIGURED) != 0)
2369                 return (1);
2370
2371         xpt_compile_path(&path,
2372                          NULL,
2373                          device->target->bus->path_id,
2374                          device->target->target_id,
2375                          device->lun_id);
2376         xpt_setup_ccb(&cgd.ccb_h, &path, CAM_PRIORITY_NORMAL);
2377         cgd.ccb_h.func_code = XPT_GDEV_TYPE;
2378         xpt_action((union ccb *)&cgd);
2379         csa->callback(csa->callback_arg,
2380                             AC_FOUND_DEVICE,
2381                             &path, &cgd);
2382         xpt_release_path(&path);
2383
2384         return(1);
2385 }
2386
2387 static int
2388 xptsetasyncbusfunc(struct cam_eb *bus, void *arg)
2389 {
2390         struct cam_path path;
2391         struct ccb_pathinq cpi;
2392         struct ccb_setasync *csa = (struct ccb_setasync *)arg;
2393
2394         xpt_compile_path(&path, /*periph*/NULL,
2395                          bus->sim->path_id,
2396                          CAM_TARGET_WILDCARD,
2397                          CAM_LUN_WILDCARD);
2398         xpt_setup_ccb(&cpi.ccb_h, &path, CAM_PRIORITY_NORMAL);
2399         cpi.ccb_h.func_code = XPT_PATH_INQ;
2400         xpt_action((union ccb *)&cpi);
2401         csa->callback(csa->callback_arg,
2402                             AC_PATH_REGISTERED,
2403                             &path, &cpi);
2404         xpt_release_path(&path);
2405
2406         return(1);
2407 }
2408
2409 void
2410 xpt_action(union ccb *start_ccb)
2411 {
2412
2413         CAM_DEBUG(start_ccb->ccb_h.path, CAM_DEBUG_TRACE, ("xpt_action\n"));
2414
2415         start_ccb->ccb_h.status = CAM_REQ_INPROG;
2416         (*(start_ccb->ccb_h.path->bus->xport->action))(start_ccb);
2417 }
2418
2419 void
2420 xpt_action_default(union ccb *start_ccb)
2421 {
2422         char cdb_str[(SCSI_MAX_CDBLEN * 3) + 1];
2423         struct cam_path *path;
2424
2425         path = start_ccb->ccb_h.path;
2426         CAM_DEBUG(path, CAM_DEBUG_TRACE, ("xpt_action_default\n"));
2427
2428         switch (start_ccb->ccb_h.func_code) {
2429         case XPT_SCSI_IO:
2430         {
2431                 struct cam_ed *device;
2432
2433                 /*
2434                  * For the sake of compatibility with SCSI-1
2435                  * devices that may not understand the identify
2436                  * message, we include lun information in the
2437                  * second byte of all commands.  SCSI-1 specifies
2438                  * that luns are a 3 bit value and reserves only 3
2439                  * bits for lun information in the CDB.  Later
2440                  * revisions of the SCSI spec allow for more than 8
2441                  * luns, but have deprecated lun information in the
2442                  * CDB.  So, if the lun won't fit, we must omit.
2443                  *
2444                  * Also be aware that during initial probing for devices,
2445                  * the inquiry information is unknown but initialized to 0.
2446                  * This means that this code will be exercised while probing
2447                  * devices with an ANSI revision greater than 2.
2448                  */
2449                 device = path->device;
2450                 if (device->protocol_version <= SCSI_REV_2
2451                  && start_ccb->ccb_h.target_lun < 8
2452                  && (start_ccb->ccb_h.flags & CAM_CDB_POINTER) == 0) {
2453
2454                         start_ccb->csio.cdb_io.cdb_bytes[1] |=
2455                             start_ccb->ccb_h.target_lun << 5;
2456                 }
2457                 start_ccb->csio.scsi_status = SCSI_STATUS_OK;
2458                 CAM_DEBUG(path, CAM_DEBUG_CDB,("%s. CDB: %s\n",
2459                           scsi_op_desc(start_ccb->csio.cdb_io.cdb_bytes[0],
2460                                        &path->device->inq_data),
2461                           scsi_cdb_string(start_ccb->csio.cdb_io.cdb_bytes,
2462                                           cdb_str, sizeof(cdb_str))));
2463         }
2464         /* FALLTHROUGH */
2465         case XPT_TARGET_IO:
2466         case XPT_CONT_TARGET_IO:
2467                 start_ccb->csio.sense_resid = 0;
2468                 start_ccb->csio.resid = 0;
2469                 /* FALLTHROUGH */
2470         case XPT_ATA_IO:
2471                 if (start_ccb->ccb_h.func_code == XPT_ATA_IO) {
2472                         start_ccb->ataio.resid = 0;
2473                         CAM_DEBUG(path, CAM_DEBUG_CDB,("%s. ACB: %s\n",
2474                             ata_op_string(&start_ccb->ataio.cmd),
2475                             ata_cmd_string(&start_ccb->ataio.cmd,
2476                                           cdb_str, sizeof(cdb_str))));
2477                 }
2478                 /* FALLTHROUGH */
2479         case XPT_RESET_DEV:
2480         case XPT_ENG_EXEC:
2481         {
2482                 int frozen;
2483
2484                 frozen = cam_ccbq_insert_ccb(&path->device->ccbq, start_ccb);
2485                 path->device->sim->devq->alloc_openings += frozen;
2486                 if (frozen > 0)
2487                         xpt_run_dev_allocq(path->bus);
2488                 if (xpt_schedule_dev_sendq(path->bus, path->device))
2489                         xpt_run_dev_sendq(path->bus);
2490                 break;
2491         }
2492         case XPT_CALC_GEOMETRY:
2493         {
2494                 struct cam_sim *sim;
2495
2496                 /* Filter out garbage */
2497                 if (start_ccb->ccg.block_size == 0
2498                  || start_ccb->ccg.volume_size == 0) {
2499                         start_ccb->ccg.cylinders = 0;
2500                         start_ccb->ccg.heads = 0;
2501                         start_ccb->ccg.secs_per_track = 0;
2502                         start_ccb->ccb_h.status = CAM_REQ_CMP;
2503                         break;
2504                 }
2505 #if defined(PC98) || defined(__sparc64__)
2506                 /*
2507                  * In a PC-98 system, geometry translation depens on
2508                  * the "real" device geometry obtained from mode page 4.
2509                  * SCSI geometry translation is performed in the
2510                  * initialization routine of the SCSI BIOS and the result
2511                  * stored in host memory.  If the translation is available
2512                  * in host memory, use it.  If not, rely on the default
2513                  * translation the device driver performs.
2514                  * For sparc64, we may need adjust the geometry of large
2515                  * disks in order to fit the limitations of the 16-bit
2516                  * fields of the VTOC8 disk label.
2517                  */
2518                 if (scsi_da_bios_params(&start_ccb->ccg) != 0) {
2519                         start_ccb->ccb_h.status = CAM_REQ_CMP;
2520                         break;
2521                 }
2522 #endif
2523                 sim = path->bus->sim;
2524                 (*(sim->sim_action))(sim, start_ccb);
2525                 break;
2526         }
2527         case XPT_ABORT:
2528         {
2529                 union ccb* abort_ccb;
2530
2531                 abort_ccb = start_ccb->cab.abort_ccb;
2532                 if (XPT_FC_IS_DEV_QUEUED(abort_ccb)) {
2533
2534                         if (abort_ccb->ccb_h.pinfo.index >= 0) {
2535                                 struct cam_ccbq *ccbq;
2536                                 struct cam_ed *device;
2537
2538                                 device = abort_ccb->ccb_h.path->device;
2539                                 ccbq = &device->ccbq;
2540                                 device->sim->devq->alloc_openings -=
2541                                     cam_ccbq_remove_ccb(ccbq, abort_ccb);
2542                                 abort_ccb->ccb_h.status =
2543                                     CAM_REQ_ABORTED|CAM_DEV_QFRZN;
2544                                 xpt_freeze_devq(abort_ccb->ccb_h.path, 1);
2545                                 xpt_done(abort_ccb);
2546                                 start_ccb->ccb_h.status = CAM_REQ_CMP;
2547                                 break;
2548                         }
2549                         if (abort_ccb->ccb_h.pinfo.index == CAM_UNQUEUED_INDEX
2550                          && (abort_ccb->ccb_h.status & CAM_SIM_QUEUED) == 0) {
2551                                 /*
2552                                  * We've caught this ccb en route to
2553                                  * the SIM.  Flag it for abort and the
2554                                  * SIM will do so just before starting
2555                                  * real work on the CCB.
2556                                  */
2557                                 abort_ccb->ccb_h.status =
2558                                     CAM_REQ_ABORTED|CAM_DEV_QFRZN;
2559                                 xpt_freeze_devq(abort_ccb->ccb_h.path, 1);
2560                                 start_ccb->ccb_h.status = CAM_REQ_CMP;
2561                                 break;
2562                         }
2563                 }
2564                 if (XPT_FC_IS_QUEUED(abort_ccb)
2565                  && (abort_ccb->ccb_h.pinfo.index == CAM_DONEQ_INDEX)) {
2566                         /*
2567                          * It's already completed but waiting
2568                          * for our SWI to get to it.
2569                          */
2570                         start_ccb->ccb_h.status = CAM_UA_ABORT;
2571                         break;
2572                 }
2573                 /*
2574                  * If we weren't able to take care of the abort request
2575                  * in the XPT, pass the request down to the SIM for processing.
2576                  */
2577         }
2578         /* FALLTHROUGH */
2579         case XPT_ACCEPT_TARGET_IO:
2580         case XPT_EN_LUN:
2581         case XPT_IMMED_NOTIFY:
2582         case XPT_NOTIFY_ACK:
2583         case XPT_RESET_BUS:
2584         case XPT_IMMEDIATE_NOTIFY:
2585         case XPT_NOTIFY_ACKNOWLEDGE:
2586         case XPT_GET_SIM_KNOB:
2587         case XPT_SET_SIM_KNOB:
2588         {
2589                 struct cam_sim *sim;
2590
2591                 sim = path->bus->sim;
2592                 (*(sim->sim_action))(sim, start_ccb);
2593                 break;
2594         }
2595         case XPT_PATH_INQ:
2596         {
2597                 struct cam_sim *sim;
2598
2599                 sim = path->bus->sim;
2600                 (*(sim->sim_action))(sim, start_ccb);
2601                 break;
2602         }
2603         case XPT_PATH_STATS:
2604                 start_ccb->cpis.last_reset = path->bus->last_reset;
2605                 start_ccb->ccb_h.status = CAM_REQ_CMP;
2606                 break;
2607         case XPT_GDEV_TYPE:
2608         {
2609                 struct cam_ed *dev;
2610
2611                 dev = path->device;
2612                 if ((dev->flags & CAM_DEV_UNCONFIGURED) != 0) {
2613                         start_ccb->ccb_h.status = CAM_DEV_NOT_THERE;
2614                 } else {
2615                         struct ccb_getdev *cgd;
2616
2617                         cgd = &start_ccb->cgd;
2618                         cgd->protocol = dev->protocol;
2619                         cgd->inq_data = dev->inq_data;
2620                         cgd->ident_data = dev->ident_data;
2621                         cgd->inq_flags = dev->inq_flags;
2622                         cgd->ccb_h.status = CAM_REQ_CMP;
2623                         cgd->serial_num_len = dev->serial_num_len;
2624                         if ((dev->serial_num_len > 0)
2625                          && (dev->serial_num != NULL))
2626                                 bcopy(dev->serial_num, cgd->serial_num,
2627                                       dev->serial_num_len);
2628                 }
2629                 break;
2630         }
2631         case XPT_GDEV_STATS:
2632         {
2633                 struct cam_ed *dev;
2634
2635                 dev = path->device;
2636                 if ((dev->flags & CAM_DEV_UNCONFIGURED) != 0) {
2637                         start_ccb->ccb_h.status = CAM_DEV_NOT_THERE;
2638                 } else {
2639                         struct ccb_getdevstats *cgds;
2640                         struct cam_eb *bus;
2641                         struct cam_et *tar;
2642
2643                         cgds = &start_ccb->cgds;
2644                         bus = path->bus;
2645                         tar = path->target;
2646                         cgds->dev_openings = dev->ccbq.dev_openings;
2647                         cgds->dev_active = dev->ccbq.dev_active;
2648                         cgds->devq_openings = dev->ccbq.devq_openings;
2649                         cgds->devq_queued = dev->ccbq.queue.entries;
2650                         cgds->held = dev->ccbq.held;
2651                         cgds->last_reset = tar->last_reset;
2652                         cgds->maxtags = dev->maxtags;
2653                         cgds->mintags = dev->mintags;
2654                         if (timevalcmp(&tar->last_reset, &bus->last_reset, <))
2655                                 cgds->last_reset = bus->last_reset;
2656                         cgds->ccb_h.status = CAM_REQ_CMP;
2657                 }
2658                 break;
2659         }
2660         case XPT_GDEVLIST:
2661         {
2662                 struct cam_periph       *nperiph;
2663                 struct periph_list      *periph_head;
2664                 struct ccb_getdevlist   *cgdl;
2665                 u_int                   i;
2666                 struct cam_ed           *device;
2667                 int                     found;
2668
2669
2670                 found = 0;
2671
2672                 /*
2673                  * Don't want anyone mucking with our data.
2674                  */
2675                 device = path->device;
2676                 periph_head = &device->periphs;
2677                 cgdl = &start_ccb->cgdl;
2678
2679                 /*
2680                  * Check and see if the list has changed since the user
2681                  * last requested a list member.  If so, tell them that the
2682                  * list has changed, and therefore they need to start over
2683                  * from the beginning.
2684                  */
2685                 if ((cgdl->index != 0) &&
2686                     (cgdl->generation != device->generation)) {
2687                         cgdl->status = CAM_GDEVLIST_LIST_CHANGED;
2688                         break;
2689                 }
2690
2691                 /*
2692                  * Traverse the list of peripherals and attempt to find
2693                  * the requested peripheral.
2694                  */
2695                 for (nperiph = SLIST_FIRST(periph_head), i = 0;
2696                      (nperiph != NULL) && (i <= cgdl->index);
2697                      nperiph = SLIST_NEXT(nperiph, periph_links), i++) {
2698                         if (i == cgdl->index) {
2699                                 strncpy(cgdl->periph_name,
2700                                         nperiph->periph_name,
2701                                         DEV_IDLEN);
2702                                 cgdl->unit_number = nperiph->unit_number;
2703                                 found = 1;
2704                         }
2705                 }
2706                 if (found == 0) {
2707                         cgdl->status = CAM_GDEVLIST_ERROR;
2708                         break;
2709                 }
2710
2711                 if (nperiph == NULL)
2712                         cgdl->status = CAM_GDEVLIST_LAST_DEVICE;
2713                 else
2714                         cgdl->status = CAM_GDEVLIST_MORE_DEVS;
2715
2716                 cgdl->index++;
2717                 cgdl->generation = device->generation;
2718
2719                 cgdl->ccb_h.status = CAM_REQ_CMP;
2720                 break;
2721         }
2722         case XPT_DEV_MATCH:
2723         {
2724                 dev_pos_type position_type;
2725                 struct ccb_dev_match *cdm;
2726
2727                 cdm = &start_ccb->cdm;
2728
2729                 /*
2730                  * There are two ways of getting at information in the EDT.
2731                  * The first way is via the primary EDT tree.  It starts
2732                  * with a list of busses, then a list of targets on a bus,
2733                  * then devices/luns on a target, and then peripherals on a
2734                  * device/lun.  The "other" way is by the peripheral driver
2735                  * lists.  The peripheral driver lists are organized by
2736                  * peripheral driver.  (obviously)  So it makes sense to
2737                  * use the peripheral driver list if the user is looking
2738                  * for something like "da1", or all "da" devices.  If the
2739                  * user is looking for something on a particular bus/target
2740                  * or lun, it's generally better to go through the EDT tree.
2741                  */
2742
2743                 if (cdm->pos.position_type != CAM_DEV_POS_NONE)
2744                         position_type = cdm->pos.position_type;
2745                 else {
2746                         u_int i;
2747
2748                         position_type = CAM_DEV_POS_NONE;
2749
2750                         for (i = 0; i < cdm->num_patterns; i++) {
2751                                 if ((cdm->patterns[i].type == DEV_MATCH_BUS)
2752                                  ||(cdm->patterns[i].type == DEV_MATCH_DEVICE)){
2753                                         position_type = CAM_DEV_POS_EDT;
2754                                         break;
2755                                 }
2756                         }
2757
2758                         if (cdm->num_patterns == 0)
2759                                 position_type = CAM_DEV_POS_EDT;
2760                         else if (position_type == CAM_DEV_POS_NONE)
2761                                 position_type = CAM_DEV_POS_PDRV;
2762                 }
2763
2764                 switch(position_type & CAM_DEV_POS_TYPEMASK) {
2765                 case CAM_DEV_POS_EDT:
2766                         xptedtmatch(cdm);
2767                         break;
2768                 case CAM_DEV_POS_PDRV:
2769                         xptperiphlistmatch(cdm);
2770                         break;
2771                 default:
2772                         cdm->status = CAM_DEV_MATCH_ERROR;
2773                         break;
2774                 }
2775
2776                 if (cdm->status == CAM_DEV_MATCH_ERROR)
2777                         start_ccb->ccb_h.status = CAM_REQ_CMP_ERR;
2778                 else
2779                         start_ccb->ccb_h.status = CAM_REQ_CMP;
2780
2781                 break;
2782         }
2783         case XPT_SASYNC_CB:
2784         {
2785                 struct ccb_setasync *csa;
2786                 struct async_node *cur_entry;
2787                 struct async_list *async_head;
2788                 u_int32_t added;
2789
2790                 csa = &start_ccb->csa;
2791                 added = csa->event_enable;
2792                 async_head = &path->device->asyncs;
2793
2794                 /*
2795                  * If there is already an entry for us, simply
2796                  * update it.
2797                  */
2798                 cur_entry = SLIST_FIRST(async_head);
2799                 while (cur_entry != NULL) {
2800                         if ((cur_entry->callback_arg == csa->callback_arg)
2801                          && (cur_entry->callback == csa->callback))
2802                                 break;
2803                         cur_entry = SLIST_NEXT(cur_entry, links);
2804                 }
2805
2806                 if (cur_entry != NULL) {
2807                         /*
2808                          * If the request has no flags set,
2809                          * remove the entry.
2810                          */
2811                         added &= ~cur_entry->event_enable;
2812                         if (csa->event_enable == 0) {
2813                                 SLIST_REMOVE(async_head, cur_entry,
2814                                              async_node, links);
2815                                 xpt_release_device(path->device);
2816                                 free(cur_entry, M_CAMXPT);
2817                         } else {
2818                                 cur_entry->event_enable = csa->event_enable;
2819                         }
2820                         csa->event_enable = added;
2821                 } else {
2822                         cur_entry = malloc(sizeof(*cur_entry), M_CAMXPT,
2823                                            M_NOWAIT);
2824                         if (cur_entry == NULL) {
2825                                 csa->ccb_h.status = CAM_RESRC_UNAVAIL;
2826                                 break;
2827                         }
2828                         cur_entry->event_enable = csa->event_enable;
2829                         cur_entry->callback_arg = csa->callback_arg;
2830                         cur_entry->callback = csa->callback;
2831                         SLIST_INSERT_HEAD(async_head, cur_entry, links);
2832                         xpt_acquire_device(path->device);
2833                 }
2834                 start_ccb->ccb_h.status = CAM_REQ_CMP;
2835                 break;
2836         }
2837         case XPT_REL_SIMQ:
2838         {
2839                 struct ccb_relsim *crs;
2840                 struct cam_ed *dev;
2841
2842                 crs = &start_ccb->crs;
2843                 dev = path->device;
2844                 if (dev == NULL) {
2845
2846                         crs->ccb_h.status = CAM_DEV_NOT_THERE;
2847                         break;
2848                 }
2849
2850                 if ((crs->release_flags & RELSIM_ADJUST_OPENINGS) != 0) {
2851
2852                         /* Don't ever go below one opening */
2853                         if (crs->openings > 0) {
2854                                 xpt_dev_ccbq_resize(path, crs->openings);
2855                                 if (bootverbose) {
2856                                         xpt_print(path,
2857                                             "number of openings is now %d\n",
2858                                             crs->openings);
2859                                 }
2860                         }
2861                 }
2862
2863                 if ((crs->release_flags & RELSIM_RELEASE_AFTER_TIMEOUT) != 0) {
2864
2865                         if ((dev->flags & CAM_DEV_REL_TIMEOUT_PENDING) != 0) {
2866
2867                                 /*
2868                                  * Just extend the old timeout and decrement
2869                                  * the freeze count so that a single timeout
2870                                  * is sufficient for releasing the queue.
2871                                  */
2872                                 start_ccb->ccb_h.flags &= ~CAM_DEV_QFREEZE;
2873                                 callout_stop(&dev->callout);
2874                         } else {
2875
2876                                 start_ccb->ccb_h.flags |= CAM_DEV_QFREEZE;
2877                         }
2878
2879                         callout_reset(&dev->callout,
2880                             (crs->release_timeout * hz) / 1000,
2881                             xpt_release_devq_timeout, dev);
2882
2883                         dev->flags |= CAM_DEV_REL_TIMEOUT_PENDING;
2884
2885                 }
2886
2887                 if ((crs->release_flags & RELSIM_RELEASE_AFTER_CMDCMPLT) != 0) {
2888
2889                         if ((dev->flags & CAM_DEV_REL_ON_COMPLETE) != 0) {
2890                                 /*
2891                                  * Decrement the freeze count so that a single
2892                                  * completion is still sufficient to unfreeze
2893                                  * the queue.
2894                                  */
2895                                 start_ccb->ccb_h.flags &= ~CAM_DEV_QFREEZE;
2896                         } else {
2897
2898                                 dev->flags |= CAM_DEV_REL_ON_COMPLETE;
2899                                 start_ccb->ccb_h.flags |= CAM_DEV_QFREEZE;
2900                         }
2901                 }
2902
2903                 if ((crs->release_flags & RELSIM_RELEASE_AFTER_QEMPTY) != 0) {
2904
2905                         if ((dev->flags & CAM_DEV_REL_ON_QUEUE_EMPTY) != 0
2906                          || (dev->ccbq.dev_active == 0)) {
2907
2908                                 start_ccb->ccb_h.flags &= ~CAM_DEV_QFREEZE;
2909                         } else {
2910
2911                                 dev->flags |= CAM_DEV_REL_ON_QUEUE_EMPTY;
2912                                 start_ccb->ccb_h.flags |= CAM_DEV_QFREEZE;
2913                         }
2914                 }
2915
2916                 if ((start_ccb->ccb_h.flags & CAM_DEV_QFREEZE) == 0) {
2917                         xpt_release_devq_rl(path, /*runlevel*/
2918                             (crs->release_flags & RELSIM_RELEASE_RUNLEVEL) ?
2919                                 crs->release_timeout : 0,
2920                             /*count*/1, /*run_queue*/TRUE);
2921                 }
2922                 start_ccb->crs.qfrozen_cnt = dev->ccbq.queue.qfrozen_cnt[0];
2923                 start_ccb->ccb_h.status = CAM_REQ_CMP;
2924                 break;
2925         }
2926         case XPT_DEBUG: {
2927                 /* Check that all request bits are supported. */
2928                 if (start_ccb->cdbg.flags & ~(CAM_DEBUG_COMPILE)) {
2929                         start_ccb->ccb_h.status = CAM_FUNC_NOTAVAIL;
2930                         break;
2931                 }
2932
2933                 cam_dflags = start_ccb->cdbg.flags;
2934                 if (cam_dpath != NULL) {
2935                         xpt_free_path(cam_dpath);
2936                         cam_dpath = NULL;
2937                 }
2938                 if (cam_dflags != CAM_DEBUG_NONE) {
2939                         if (xpt_create_path(&cam_dpath, xpt_periph,
2940                                             start_ccb->ccb_h.path_id,
2941                                             start_ccb->ccb_h.target_id,
2942                                             start_ccb->ccb_h.target_lun) !=
2943                                             CAM_REQ_CMP) {
2944                                 start_ccb->ccb_h.status = CAM_RESRC_UNAVAIL;
2945                                 cam_dflags = CAM_DEBUG_NONE;
2946                         } else {
2947                                 start_ccb->ccb_h.status = CAM_REQ_CMP;
2948                                 xpt_print(cam_dpath, "debugging flags now %x\n",
2949                                     cam_dflags);
2950                         }
2951                 } else {
2952                         cam_dpath = NULL;
2953                         start_ccb->ccb_h.status = CAM_REQ_CMP;
2954                 }
2955                 break;
2956         }
2957         case XPT_FREEZE_QUEUE:
2958         {
2959                 struct ccb_relsim *crs = &start_ccb->crs;
2960
2961                 xpt_freeze_devq_rl(path, /*runlevel*/
2962                     (crs->release_flags & RELSIM_RELEASE_RUNLEVEL) ?
2963                     crs->release_timeout : 0, /*count*/1);
2964                 start_ccb->ccb_h.status = CAM_REQ_CMP;
2965                 break;
2966         }
2967         case XPT_NOOP:
2968                 if ((start_ccb->ccb_h.flags & CAM_DEV_QFREEZE) != 0)
2969                         xpt_freeze_devq(path, 1);
2970                 start_ccb->ccb_h.status = CAM_REQ_CMP;
2971                 break;
2972         default:
2973         case XPT_SDEV_TYPE:
2974         case XPT_TERM_IO:
2975         case XPT_ENG_INQ:
2976                 /* XXX Implement */
2977                 start_ccb->ccb_h.status = CAM_PROVIDE_FAIL;
2978                 if (start_ccb->ccb_h.func_code & XPT_FC_DEV_QUEUED) {
2979                         xpt_done(start_ccb);
2980                 }
2981                 break;
2982         }
2983 }
2984
2985 void
2986 xpt_polled_action(union ccb *start_ccb)
2987 {
2988         u_int32_t timeout;
2989         struct    cam_sim *sim;
2990         struct    cam_devq *devq;
2991         struct    cam_ed *dev;
2992
2993
2994         timeout = start_ccb->ccb_h.timeout * 10;
2995         sim = start_ccb->ccb_h.path->bus->sim;
2996         devq = sim->devq;
2997         dev = start_ccb->ccb_h.path->device;
2998
2999         mtx_assert(sim->mtx, MA_OWNED);
3000
3001         /* Don't use ISR for this SIM while polling. */
3002         sim->flags |= CAM_SIM_POLLED;
3003
3004         /*
3005          * Steal an opening so that no other queued requests
3006          * can get it before us while we simulate interrupts.
3007          */
3008         dev->ccbq.devq_openings--;
3009         dev->ccbq.dev_openings--;
3010
3011         while(((devq != NULL && devq->send_openings <= 0) ||
3012            dev->ccbq.dev_openings < 0) && (--timeout > 0)) {
3013                 DELAY(100);
3014                 (*(sim->sim_poll))(sim);
3015                 camisr_runqueue(&sim->sim_doneq);
3016         }
3017
3018         dev->ccbq.devq_openings++;
3019         dev->ccbq.dev_openings++;
3020
3021         if (timeout != 0) {
3022                 xpt_action(start_ccb);
3023                 while(--timeout > 0) {
3024                         (*(sim->sim_poll))(sim);
3025                         camisr_runqueue(&sim->sim_doneq);
3026                         if ((start_ccb->ccb_h.status  & CAM_STATUS_MASK)
3027                             != CAM_REQ_INPROG)
3028                                 break;
3029                         DELAY(100);
3030                 }
3031                 if (timeout == 0) {
3032                         /*
3033                          * XXX Is it worth adding a sim_timeout entry
3034                          * point so we can attempt recovery?  If
3035                          * this is only used for dumps, I don't think
3036                          * it is.
3037                          */
3038                         start_ccb->ccb_h.status = CAM_CMD_TIMEOUT;
3039                 }
3040         } else {
3041                 start_ccb->ccb_h.status = CAM_RESRC_UNAVAIL;
3042         }
3043
3044         /* We will use CAM ISR for this SIM again. */
3045         sim->flags &= ~CAM_SIM_POLLED;
3046 }
3047
3048 /*
3049  * Schedule a peripheral driver to receive a ccb when it's
3050  * target device has space for more transactions.
3051  */
3052 void
3053 xpt_schedule(struct cam_periph *perph, u_int32_t new_priority)
3054 {
3055         struct cam_ed *device;
3056         int runq = 0;
3057
3058         mtx_assert(perph->sim->mtx, MA_OWNED);
3059
3060         CAM_DEBUG(perph->path, CAM_DEBUG_TRACE, ("xpt_schedule\n"));
3061         device = perph->path->device;
3062         if (periph_is_queued(perph)) {
3063                 /* Simply reorder based on new priority */
3064                 CAM_DEBUG(perph->path, CAM_DEBUG_SUBTRACE,
3065                           ("   change priority to %d\n", new_priority));
3066                 if (new_priority < perph->pinfo.priority) {
3067                         camq_change_priority(&device->drvq,
3068                                              perph->pinfo.index,
3069                                              new_priority);
3070                         runq = xpt_schedule_dev_allocq(perph->path->bus, device);
3071                 }
3072         } else {
3073                 /* New entry on the queue */
3074                 CAM_DEBUG(perph->path, CAM_DEBUG_SUBTRACE,
3075                           ("   added periph to queue\n"));
3076                 perph->pinfo.priority = new_priority;
3077                 perph->pinfo.generation = ++device->drvq.generation;
3078                 camq_insert(&device->drvq, &perph->pinfo);
3079                 runq = xpt_schedule_dev_allocq(perph->path->bus, device);
3080         }
3081         if (runq != 0) {
3082                 CAM_DEBUG(perph->path, CAM_DEBUG_SUBTRACE,
3083                           ("   calling xpt_run_devq\n"));
3084                 xpt_run_dev_allocq(perph->path->bus);
3085         }
3086 }
3087
3088
3089 /*
3090  * Schedule a device to run on a given queue.
3091  * If the device was inserted as a new entry on the queue,
3092  * return 1 meaning the device queue should be run. If we
3093  * were already queued, implying someone else has already
3094  * started the queue, return 0 so the caller doesn't attempt
3095  * to run the queue.
3096  */
3097 int
3098 xpt_schedule_dev(struct camq *queue, cam_pinfo *pinfo,
3099                  u_int32_t new_priority)
3100 {
3101         int retval;
3102         u_int32_t old_priority;
3103
3104         CAM_DEBUG_PRINT(CAM_DEBUG_XPT, ("xpt_schedule_dev\n"));
3105
3106         old_priority = pinfo->priority;
3107
3108         /*
3109          * Are we already queued?
3110          */
3111         if (pinfo->index != CAM_UNQUEUED_INDEX) {
3112                 /* Simply reorder based on new priority */
3113                 if (new_priority < old_priority) {
3114                         camq_change_priority(queue, pinfo->index,
3115                                              new_priority);
3116                         CAM_DEBUG_PRINT(CAM_DEBUG_XPT,
3117                                         ("changed priority to %d\n",
3118                                          new_priority));
3119                         retval = 1;
3120                 } else
3121                         retval = 0;
3122         } else {
3123                 /* New entry on the queue */
3124                 if (new_priority < old_priority)
3125                         pinfo->priority = new_priority;
3126
3127                 CAM_DEBUG_PRINT(CAM_DEBUG_XPT,
3128                                 ("Inserting onto queue\n"));
3129                 pinfo->generation = ++queue->generation;
3130                 camq_insert(queue, pinfo);
3131                 retval = 1;
3132         }
3133         return (retval);
3134 }
3135
3136 static void
3137 xpt_run_dev_allocq(struct cam_eb *bus)
3138 {
3139         struct  cam_devq *devq;
3140
3141         CAM_DEBUG_PRINT(CAM_DEBUG_XPT, ("xpt_run_dev_allocq\n"));
3142         devq = bus->sim->devq;
3143
3144         CAM_DEBUG_PRINT(CAM_DEBUG_XPT,
3145                         ("   qfrozen_cnt == 0x%x, entries == %d, "
3146                          "openings == %d, active == %d\n",
3147                          devq->alloc_queue.qfrozen_cnt[0],
3148                          devq->alloc_queue.entries,
3149                          devq->alloc_openings,
3150                          devq->alloc_active));
3151
3152         devq->alloc_queue.qfrozen_cnt[0]++;
3153         while ((devq->alloc_queue.entries > 0)
3154             && (devq->alloc_openings > 0)
3155             && (devq->alloc_queue.qfrozen_cnt[0] <= 1)) {
3156                 struct  cam_ed_qinfo *qinfo;
3157                 struct  cam_ed *device;
3158                 union   ccb *work_ccb;
3159                 struct  cam_periph *drv;
3160                 struct  camq *drvq;
3161
3162                 qinfo = (struct cam_ed_qinfo *)camq_remove(&devq->alloc_queue,
3163                                                            CAMQ_HEAD);
3164                 device = qinfo->device;
3165                 CAM_DEBUG_PRINT(CAM_DEBUG_XPT,
3166                                 ("running device %p\n", device));
3167
3168                 drvq = &device->drvq;
3169                 KASSERT(drvq->entries > 0, ("xpt_run_dev_allocq: "
3170                     "Device on queue without any work to do"));
3171                 if ((work_ccb = xpt_get_ccb(device)) != NULL) {
3172                         devq->alloc_openings--;
3173                         devq->alloc_active++;
3174                         drv = (struct cam_periph*)camq_remove(drvq, CAMQ_HEAD);
3175                         xpt_setup_ccb(&work_ccb->ccb_h, drv->path,
3176                                       drv->pinfo.priority);
3177                         CAM_DEBUG_PRINT(CAM_DEBUG_XPT,
3178                                         ("calling periph start\n"));
3179                         drv->periph_start(drv, work_ccb);
3180                 } else {
3181                         /*
3182                          * Malloc failure in alloc_ccb
3183                          */
3184                         /*
3185                          * XXX add us to a list to be run from free_ccb
3186                          * if we don't have any ccbs active on this
3187                          * device queue otherwise we may never get run
3188                          * again.
3189                          */
3190                         break;
3191                 }
3192
3193                 /* We may have more work. Attempt to reschedule. */
3194                 xpt_schedule_dev_allocq(bus, device);
3195         }
3196         devq->alloc_queue.qfrozen_cnt[0]--;
3197 }
3198
3199 static void
3200 xpt_run_dev_sendq(struct cam_eb *bus)
3201 {
3202         struct  cam_devq *devq;
3203
3204         CAM_DEBUG_PRINT(CAM_DEBUG_XPT, ("xpt_run_dev_sendq\n"));
3205
3206         devq = bus->sim->devq;
3207
3208         devq->send_queue.qfrozen_cnt[0]++;
3209         while ((devq->send_queue.entries > 0)
3210             && (devq->send_openings > 0)
3211             && (devq->send_queue.qfrozen_cnt[0] <= 1)) {
3212                 struct  cam_ed_qinfo *qinfo;
3213                 struct  cam_ed *device;
3214                 union ccb *work_ccb;
3215                 struct  cam_sim *sim;
3216
3217                 qinfo = (struct cam_ed_qinfo *)camq_remove(&devq->send_queue,
3218                                                            CAMQ_HEAD);
3219                 device = qinfo->device;
3220                 CAM_DEBUG_PRINT(CAM_DEBUG_XPT,
3221                                 ("running device %p\n", device));
3222
3223                 work_ccb = cam_ccbq_peek_ccb(&device->ccbq, CAMQ_HEAD);
3224                 if (work_ccb == NULL) {
3225                         printf("device on run queue with no ccbs???\n");
3226                         continue;
3227                 }
3228
3229                 if ((work_ccb->ccb_h.flags & CAM_HIGH_POWER) != 0) {
3230
3231                         mtx_lock(&xsoftc.xpt_lock);
3232                         if (xsoftc.num_highpower <= 0) {
3233                                 /*
3234                                  * We got a high power command, but we
3235                                  * don't have any available slots.  Freeze
3236                                  * the device queue until we have a slot
3237                                  * available.
3238                                  */
3239                                 xpt_freeze_devq(work_ccb->ccb_h.path, 1);
3240                                 STAILQ_INSERT_TAIL(&xsoftc.highpowerq,
3241                                                    &work_ccb->ccb_h,
3242                                                    xpt_links.stqe);
3243
3244                                 mtx_unlock(&xsoftc.xpt_lock);
3245                                 continue;
3246                         } else {
3247                                 /*
3248                                  * Consume a high power slot while
3249                                  * this ccb runs.
3250                                  */
3251                                 xsoftc.num_highpower--;
3252                         }
3253                         mtx_unlock(&xsoftc.xpt_lock);
3254                 }
3255                 cam_ccbq_remove_ccb(&device->ccbq, work_ccb);
3256                 cam_ccbq_send_ccb(&device->ccbq, work_ccb);
3257
3258                 devq->send_openings--;
3259                 devq->send_active++;
3260
3261                 xpt_schedule_dev_sendq(bus, device);
3262
3263                 if (work_ccb && (work_ccb->ccb_h.flags & CAM_DEV_QFREEZE) != 0){
3264                         /*
3265                          * The client wants to freeze the queue
3266                          * after this CCB is sent.
3267                          */
3268                         xpt_freeze_devq(work_ccb->ccb_h.path, 1);
3269                 }
3270
3271                 /* In Target mode, the peripheral driver knows best... */
3272                 if (work_ccb->ccb_h.func_code == XPT_SCSI_IO) {
3273                         if ((device->inq_flags & SID_CmdQue) != 0
3274                          && work_ccb->csio.tag_action != CAM_TAG_ACTION_NONE)
3275                                 work_ccb->ccb_h.flags |= CAM_TAG_ACTION_VALID;
3276                         else
3277                                 /*
3278                                  * Clear this in case of a retried CCB that
3279                                  * failed due to a rejected tag.
3280                                  */
3281                                 work_ccb->ccb_h.flags &= ~CAM_TAG_ACTION_VALID;
3282                 }
3283
3284                 /*
3285                  * Device queues can be shared among multiple sim instances
3286                  * that reside on different busses.  Use the SIM in the queue
3287                  * CCB's path, rather than the one in the bus that was passed
3288                  * into this function.
3289                  */
3290                 sim = work_ccb->ccb_h.path->bus->sim;
3291                 (*(sim->sim_action))(sim, work_ccb);
3292         }
3293         devq->send_queue.qfrozen_cnt[0]--;
3294 }
3295
3296 /*
3297  * This function merges stuff from the slave ccb into the master ccb, while
3298  * keeping important fields in the master ccb constant.
3299  */
3300 void
3301 xpt_merge_ccb(union ccb *master_ccb, union ccb *slave_ccb)
3302 {
3303
3304         /*
3305          * Pull fields that are valid for peripheral drivers to set
3306          * into the master CCB along with the CCB "payload".
3307          */
3308         master_ccb->ccb_h.retry_count = slave_ccb->ccb_h.retry_count;
3309         master_ccb->ccb_h.func_code = slave_ccb->ccb_h.func_code;
3310         master_ccb->ccb_h.timeout = slave_ccb->ccb_h.timeout;
3311         master_ccb->ccb_h.flags = slave_ccb->ccb_h.flags;
3312         bcopy(&(&slave_ccb->ccb_h)[1], &(&master_ccb->ccb_h)[1],
3313               sizeof(union ccb) - sizeof(struct ccb_hdr));
3314 }
3315
3316 void
3317 xpt_setup_ccb(struct ccb_hdr *ccb_h, struct cam_path *path, u_int32_t priority)
3318 {
3319
3320         CAM_DEBUG(path, CAM_DEBUG_TRACE, ("xpt_setup_ccb\n"));
3321         ccb_h->pinfo.priority = priority;
3322         ccb_h->path = path;
3323         ccb_h->path_id = path->bus->path_id;
3324         if (path->target)
3325                 ccb_h->target_id = path->target->target_id;
3326         else
3327                 ccb_h->target_id = CAM_TARGET_WILDCARD;
3328         if (path->device) {
3329                 ccb_h->target_lun = path->device->lun_id;
3330                 ccb_h->pinfo.generation = ++path->device->ccbq.queue.generation;
3331         } else {
3332                 ccb_h->target_lun = CAM_TARGET_WILDCARD;
3333         }
3334         ccb_h->pinfo.index = CAM_UNQUEUED_INDEX;
3335         ccb_h->flags = 0;
3336 }
3337
3338 /* Path manipulation functions */
3339 cam_status
3340 xpt_create_path(struct cam_path **new_path_ptr, struct cam_periph *perph,
3341                 path_id_t path_id, target_id_t target_id, lun_id_t lun_id)
3342 {
3343         struct     cam_path *path;
3344         cam_status status;
3345
3346         path = (struct cam_path *)malloc(sizeof(*path), M_CAMXPT, M_NOWAIT);
3347
3348         if (path == NULL) {
3349                 status = CAM_RESRC_UNAVAIL;
3350                 return(status);
3351         }
3352         status = xpt_compile_path(path, perph, path_id, target_id, lun_id);
3353         if (status != CAM_REQ_CMP) {
3354                 free(path, M_CAMXPT);
3355                 path = NULL;
3356         }
3357         *new_path_ptr = path;
3358         return (status);
3359 }
3360
3361 cam_status
3362 xpt_create_path_unlocked(struct cam_path **new_path_ptr,
3363                          struct cam_periph *periph, path_id_t path_id,
3364                          target_id_t target_id, lun_id_t lun_id)
3365 {
3366         struct     cam_path *path;
3367         struct     cam_eb *bus = NULL;
3368         cam_status status;
3369         int        need_unlock = 0;
3370
3371         path = (struct cam_path *)malloc(sizeof(*path), M_CAMXPT, M_WAITOK);
3372
3373         if (path_id != CAM_BUS_WILDCARD) {
3374                 bus = xpt_find_bus(path_id);
3375                 if (bus != NULL) {
3376                         need_unlock = 1;
3377                         CAM_SIM_LOCK(bus->sim);
3378                 }
3379         }
3380         status = xpt_compile_path(path, periph, path_id, target_id, lun_id);
3381         if (need_unlock) {
3382                 CAM_SIM_UNLOCK(bus->sim);
3383                 xpt_release_bus(bus);
3384         }
3385         if (status != CAM_REQ_CMP) {
3386                 free(path, M_CAMXPT);
3387                 path = NULL;
3388         }
3389         *new_path_ptr = path;
3390         return (status);
3391 }
3392
3393 cam_status
3394 xpt_compile_path(struct cam_path *new_path, struct cam_periph *perph,
3395                  path_id_t path_id, target_id_t target_id, lun_id_t lun_id)
3396 {
3397         struct       cam_eb *bus;
3398         struct       cam_et *target;
3399         struct       cam_ed *device;
3400         cam_status   status;
3401
3402         status = CAM_REQ_CMP;   /* Completed without error */
3403         target = NULL;          /* Wildcarded */
3404         device = NULL;          /* Wildcarded */
3405
3406         /*
3407          * We will potentially modify the EDT, so block interrupts
3408          * that may attempt to create cam paths.
3409          */
3410         bus = xpt_find_bus(path_id);
3411         if (bus == NULL) {
3412                 status = CAM_PATH_INVALID;
3413         } else {
3414                 target = xpt_find_target(bus, target_id);
3415                 if (target == NULL) {
3416                         /* Create one */
3417                         struct cam_et *new_target;
3418
3419                         new_target = xpt_alloc_target(bus, target_id);
3420                         if (new_target == NULL) {
3421                                 status = CAM_RESRC_UNAVAIL;
3422                         } else {
3423                                 target = new_target;
3424                         }
3425                 }
3426                 if (target != NULL) {
3427                         device = xpt_find_device(target, lun_id);
3428                         if (device == NULL) {
3429                                 /* Create one */
3430                                 struct cam_ed *new_device;
3431
3432                                 new_device =
3433                                     (*(bus->xport->alloc_device))(bus,
3434                                                                       target,
3435                                                                       lun_id);
3436                                 if (new_device == NULL) {
3437                                         status = CAM_RESRC_UNAVAIL;
3438                                 } else {
3439                                         device = new_device;
3440                                 }
3441                         }
3442                 }
3443         }
3444
3445         /*
3446          * Only touch the user's data if we are successful.
3447          */
3448         if (status == CAM_REQ_CMP) {
3449                 new_path->periph = perph;
3450                 new_path->bus = bus;
3451                 new_path->target = target;
3452                 new_path->device = device;
3453                 CAM_DEBUG(new_path, CAM_DEBUG_TRACE, ("xpt_compile_path\n"));
3454         } else {
3455                 if (device != NULL)
3456                         xpt_release_device(device);
3457                 if (target != NULL)
3458                         xpt_release_target(target);
3459                 if (bus != NULL)
3460                         xpt_release_bus(bus);
3461         }
3462         return (status);
3463 }
3464
3465 void
3466 xpt_release_path(struct cam_path *path)
3467 {
3468         CAM_DEBUG(path, CAM_DEBUG_TRACE, ("xpt_release_path\n"));
3469         if (path->device != NULL) {
3470                 xpt_release_device(path->device);
3471                 path->device = NULL;
3472         }
3473         if (path->target != NULL) {
3474                 xpt_release_target(path->target);
3475                 path->target = NULL;
3476         }
3477         if (path->bus != NULL) {
3478                 xpt_release_bus(path->bus);
3479                 path->bus = NULL;
3480         }
3481 }
3482
3483 void
3484 xpt_free_path(struct cam_path *path)
3485 {
3486
3487         CAM_DEBUG(path, CAM_DEBUG_TRACE, ("xpt_free_path\n"));
3488         xpt_release_path(path);
3489         free(path, M_CAMXPT);
3490 }
3491
3492 void
3493 xpt_path_counts(struct cam_path *path, uint32_t *bus_ref,
3494     uint32_t *periph_ref, uint32_t *target_ref, uint32_t *device_ref)
3495 {
3496
3497         mtx_lock(&xsoftc.xpt_topo_lock);
3498         if (bus_ref) {
3499                 if (path->bus)
3500                         *bus_ref = path->bus->refcount;
3501                 else
3502                         *bus_ref = 0;
3503         }
3504         mtx_unlock(&xsoftc.xpt_topo_lock);
3505         if (periph_ref) {
3506                 if (path->periph)
3507                         *periph_ref = path->periph->refcount;
3508                 else
3509                         *periph_ref = 0;
3510         }
3511         if (target_ref) {
3512                 if (path->target)
3513                         *target_ref = path->target->refcount;
3514                 else
3515                         *target_ref = 0;
3516         }
3517         if (device_ref) {
3518                 if (path->device)
3519                         *device_ref = path->device->refcount;
3520                 else
3521                         *device_ref = 0;
3522         }
3523 }
3524
3525 /*
3526  * Return -1 for failure, 0 for exact match, 1 for match with wildcards
3527  * in path1, 2 for match with wildcards in path2.
3528  */
3529 int
3530 xpt_path_comp(struct cam_path *path1, struct cam_path *path2)
3531 {
3532         int retval = 0;
3533
3534         if (path1->bus != path2->bus) {
3535                 if (path1->bus->path_id == CAM_BUS_WILDCARD)
3536                         retval = 1;
3537                 else if (path2->bus->path_id == CAM_BUS_WILDCARD)
3538                         retval = 2;
3539                 else
3540                         return (-1);
3541         }
3542         if (path1->target != path2->target) {
3543                 if (path1->target->target_id == CAM_TARGET_WILDCARD) {
3544                         if (retval == 0)
3545                                 retval = 1;
3546                 } else if (path2->target->target_id == CAM_TARGET_WILDCARD)
3547                         retval = 2;
3548                 else
3549                         return (-1);
3550         }
3551         if (path1->device != path2->device) {
3552                 if (path1->device->lun_id == CAM_LUN_WILDCARD) {
3553                         if (retval == 0)
3554                                 retval = 1;
3555                 } else if (path2->device->lun_id == CAM_LUN_WILDCARD)
3556                         retval = 2;
3557                 else
3558                         return (-1);
3559         }
3560         return (retval);
3561 }
3562
3563 void
3564 xpt_print_path(struct cam_path *path)
3565 {
3566
3567         if (path == NULL)
3568                 printf("(nopath): ");
3569         else {
3570                 if (path->periph != NULL)
3571                         printf("(%s%d:", path->periph->periph_name,
3572                                path->periph->unit_number);
3573                 else
3574                         printf("(noperiph:");
3575
3576                 if (path->bus != NULL)
3577                         printf("%s%d:%d:", path->bus->sim->sim_name,
3578                                path->bus->sim->unit_number,
3579                                path->bus->sim->bus_id);
3580                 else
3581                         printf("nobus:");
3582
3583                 if (path->target != NULL)
3584                         printf("%d:", path->target->target_id);
3585                 else
3586                         printf("X:");
3587
3588                 if (path->device != NULL)
3589                         printf("%d): ", path->device->lun_id);
3590                 else
3591                         printf("X): ");
3592         }
3593 }
3594
3595 void
3596 xpt_print(struct cam_path *path, const char *fmt, ...)
3597 {
3598         va_list ap;
3599         xpt_print_path(path);
3600         va_start(ap, fmt);
3601         vprintf(fmt, ap);
3602         va_end(ap);
3603 }
3604
3605 int
3606 xpt_path_string(struct cam_path *path, char *str, size_t str_len)
3607 {
3608         struct sbuf sb;
3609
3610 #ifdef INVARIANTS
3611         if (path != NULL && path->bus != NULL)
3612                 mtx_assert(path->bus->sim->mtx, MA_OWNED);
3613 #endif
3614
3615         sbuf_new(&sb, str, str_len, 0);
3616
3617         if (path == NULL)
3618                 sbuf_printf(&sb, "(nopath): ");
3619         else {
3620                 if (path->periph != NULL)
3621                         sbuf_printf(&sb, "(%s%d:", path->periph->periph_name,
3622                                     path->periph->unit_number);
3623                 else
3624                         sbuf_printf(&sb, "(noperiph:");
3625
3626                 if (path->bus != NULL)
3627                         sbuf_printf(&sb, "%s%d:%d:", path->bus->sim->sim_name,
3628                                     path->bus->sim->unit_number,
3629                                     path->bus->sim->bus_id);
3630                 else
3631                         sbuf_printf(&sb, "nobus:");
3632
3633                 if (path->target != NULL)
3634                         sbuf_printf(&sb, "%d:", path->target->target_id);
3635                 else
3636                         sbuf_printf(&sb, "X:");
3637
3638                 if (path->device != NULL)
3639                         sbuf_printf(&sb, "%d): ", path->device->lun_id);
3640                 else
3641                         sbuf_printf(&sb, "X): ");
3642         }
3643         sbuf_finish(&sb);
3644
3645         return(sbuf_len(&sb));
3646 }
3647
3648 path_id_t
3649 xpt_path_path_id(struct cam_path *path)
3650 {
3651         mtx_assert(path->bus->sim->mtx, MA_OWNED);
3652
3653         return(path->bus->path_id);
3654 }
3655
3656 target_id_t
3657 xpt_path_target_id(struct cam_path *path)
3658 {
3659         mtx_assert(path->bus->sim->mtx, MA_OWNED);
3660
3661         if (path->target != NULL)
3662                 return (path->target->target_id);
3663         else
3664                 return (CAM_TARGET_WILDCARD);
3665 }
3666
3667 lun_id_t
3668 xpt_path_lun_id(struct cam_path *path)
3669 {
3670         mtx_assert(path->bus->sim->mtx, MA_OWNED);
3671
3672         if (path->device != NULL)
3673                 return (path->device->lun_id);
3674         else
3675                 return (CAM_LUN_WILDCARD);
3676 }
3677
3678 struct cam_sim *
3679 xpt_path_sim(struct cam_path *path)
3680 {
3681
3682         return (path->bus->sim);
3683 }
3684
3685 struct cam_periph*
3686 xpt_path_periph(struct cam_path *path)
3687 {
3688         mtx_assert(path->bus->sim->mtx, MA_OWNED);
3689
3690         return (path->periph);
3691 }
3692
3693 int
3694 xpt_path_legacy_ata_id(struct cam_path *path)
3695 {
3696         struct cam_eb *bus;
3697         int bus_id;
3698
3699         if ((strcmp(path->bus->sim->sim_name, "ata") != 0) &&
3700             strcmp(path->bus->sim->sim_name, "ahcich") != 0 &&
3701             strcmp(path->bus->sim->sim_name, "mvsch") != 0 &&
3702             strcmp(path->bus->sim->sim_name, "siisch") != 0)
3703                 return (-1);
3704
3705         if (strcmp(path->bus->sim->sim_name, "ata") == 0 &&
3706             path->bus->sim->unit_number < 2) {
3707                 bus_id = path->bus->sim->unit_number;
3708         } else {
3709                 bus_id = 2;
3710                 xpt_lock_buses();
3711                 TAILQ_FOREACH(bus, &xsoftc.xpt_busses, links) {
3712                         if (bus == path->bus)
3713                                 break;
3714                         if ((strcmp(bus->sim->sim_name, "ata") == 0 &&
3715                              bus->sim->unit_number >= 2) ||
3716                             strcmp(bus->sim->sim_name, "ahcich") == 0 ||
3717                             strcmp(bus->sim->sim_name, "mvsch") == 0 ||
3718                             strcmp(bus->sim->sim_name, "siisch") == 0)
3719                                 bus_id++;
3720                 }
3721                 xpt_unlock_buses();
3722         }
3723         if (path->target != NULL) {
3724                 if (path->target->target_id < 2)
3725                         return (bus_id * 2 + path->target->target_id);
3726                 else
3727                         return (-1);
3728         } else
3729                 return (bus_id * 2);
3730 }
3731
3732 /*
3733  * Release a CAM control block for the caller.  Remit the cost of the structure
3734  * to the device referenced by the path.  If the this device had no 'credits'
3735  * and peripheral drivers have registered async callbacks for this notification
3736  * call them now.
3737  */
3738 void
3739 xpt_release_ccb(union ccb *free_ccb)
3740 {
3741         struct   cam_path *path;
3742         struct   cam_ed *device;
3743         struct   cam_eb *bus;
3744         struct   cam_sim *sim;
3745
3746         CAM_DEBUG_PRINT(CAM_DEBUG_XPT, ("xpt_release_ccb\n"));
3747         path = free_ccb->ccb_h.path;
3748         device = path->device;
3749         bus = path->bus;
3750         sim = bus->sim;
3751
3752         mtx_assert(sim->mtx, MA_OWNED);
3753
3754         cam_ccbq_release_opening(&device->ccbq);
3755         if (device->flags & CAM_DEV_RESIZE_QUEUE_NEEDED) {
3756                 device->flags &= ~CAM_DEV_RESIZE_QUEUE_NEEDED;
3757                 cam_ccbq_resize(&device->ccbq,
3758                     device->ccbq.dev_openings + device->ccbq.dev_active);
3759         }
3760         if (sim->ccb_count > sim->max_ccbs) {
3761                 xpt_free_ccb(free_ccb);
3762                 sim->ccb_count--;
3763         } else {
3764                 SLIST_INSERT_HEAD(&sim->ccb_freeq, &free_ccb->ccb_h,
3765                     xpt_links.sle);
3766         }
3767         if (sim->devq == NULL) {
3768                 return;
3769         }
3770         sim->devq->alloc_openings++;
3771         sim->devq->alloc_active--;
3772         if (device_is_alloc_queued(device) == 0)
3773                 xpt_schedule_dev_allocq(bus, device);
3774         xpt_run_dev_allocq(bus);
3775 }
3776
3777 /* Functions accessed by SIM drivers */
3778
3779 static struct xpt_xport xport_default = {
3780         .alloc_device = xpt_alloc_device_default,
3781         .action = xpt_action_default,
3782         .async = xpt_dev_async_default,
3783 };
3784
3785 /*
3786  * A sim structure, listing the SIM entry points and instance
3787  * identification info is passed to xpt_bus_register to hook the SIM
3788  * into the CAM framework.  xpt_bus_register creates a cam_eb entry
3789  * for this new bus and places it in the array of busses and assigns
3790  * it a path_id.  The path_id may be influenced by "hard wiring"
3791  * information specified by the user.  Once interrupt services are
3792  * available, the bus will be probed.
3793  */
3794 int32_t
3795 xpt_bus_register(struct cam_sim *sim, device_t parent, u_int32_t bus)
3796 {
3797         struct cam_eb *new_bus;
3798         struct cam_eb *old_bus;
3799         struct ccb_pathinq cpi;
3800         struct cam_path *path;
3801         cam_status status;
3802
3803         mtx_assert(sim->mtx, MA_OWNED);
3804
3805         sim->bus_id = bus;
3806         new_bus = (struct cam_eb *)malloc(sizeof(*new_bus),
3807                                           M_CAMXPT, M_NOWAIT);
3808         if (new_bus == NULL) {
3809                 /* Couldn't satisfy request */
3810                 return (CAM_RESRC_UNAVAIL);
3811         }
3812         path = (struct cam_path *)malloc(sizeof(*path), M_CAMXPT, M_NOWAIT);
3813         if (path == NULL) {
3814                 free(new_bus, M_CAMXPT);
3815                 return (CAM_RESRC_UNAVAIL);
3816         }
3817
3818         if (strcmp(sim->sim_name, "xpt") != 0) {
3819                 sim->path_id =
3820                     xptpathid(sim->sim_name, sim->unit_number, sim->bus_id);
3821         }
3822
3823         TAILQ_INIT(&new_bus->et_entries);
3824         new_bus->path_id = sim->path_id;
3825         cam_sim_hold(sim);
3826         new_bus->sim = sim;
3827         timevalclear(&new_bus->last_reset);
3828         new_bus->flags = 0;
3829         new_bus->refcount = 1;  /* Held until a bus_deregister event */
3830         new_bus->generation = 0;
3831
3832         mtx_lock(&xsoftc.xpt_topo_lock);
3833         old_bus = TAILQ_FIRST(&xsoftc.xpt_busses);
3834         while (old_bus != NULL
3835             && old_bus->path_id < new_bus->path_id)
3836                 old_bus = TAILQ_NEXT(old_bus, links);
3837         if (old_bus != NULL)
3838                 TAILQ_INSERT_BEFORE(old_bus, new_bus, links);
3839         else
3840                 TAILQ_INSERT_TAIL(&xsoftc.xpt_busses, new_bus, links);
3841         xsoftc.bus_generation++;
3842         mtx_unlock(&xsoftc.xpt_topo_lock);
3843
3844         /*
3845          * Set a default transport so that a PATH_INQ can be issued to
3846          * the SIM.  This will then allow for probing and attaching of
3847          * a more appropriate transport.
3848          */
3849         new_bus->xport = &xport_default;
3850
3851         status = xpt_compile_path(path, /*periph*/NULL, sim->path_id,
3852                                   CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD);
3853         if (status != CAM_REQ_CMP)
3854                 printf("xpt_compile_path returned %d\n", status);
3855
3856         xpt_setup_ccb(&cpi.ccb_h, path, CAM_PRIORITY_NORMAL);
3857         cpi.ccb_h.func_code = XPT_PATH_INQ;
3858         xpt_action((union ccb *)&cpi);
3859
3860         if (cpi.ccb_h.status == CAM_REQ_CMP) {
3861                 switch (cpi.transport) {
3862                 case XPORT_SPI:
3863                 case XPORT_SAS:
3864                 case XPORT_FC:
3865                 case XPORT_USB:
3866                 case XPORT_ISCSI:
3867                 case XPORT_PPB:
3868                         new_bus->xport = scsi_get_xport();
3869                         break;
3870                 case XPORT_ATA:
3871                 case XPORT_SATA:
3872                         new_bus->xport = ata_get_xport();
3873                         break;
3874                 default:
3875                         new_bus->xport = &xport_default;
3876                         break;
3877                 }
3878         }
3879
3880         /* Notify interested parties */
3881         if (sim->path_id != CAM_XPT_PATH_ID) {
3882                 union   ccb *scan_ccb;
3883
3884                 xpt_async(AC_PATH_REGISTERED, path, &cpi);
3885                 /* Initiate bus rescan. */
3886                 scan_ccb = xpt_alloc_ccb_nowait();
3887                 scan_ccb->ccb_h.path = path;
3888                 scan_ccb->ccb_h.func_code = XPT_SCAN_BUS;
3889                 scan_ccb->crcn.flags = 0;
3890                 xpt_rescan(scan_ccb);
3891         } else
3892                 xpt_free_path(path);
3893         return (CAM_SUCCESS);
3894 }
3895
3896 int32_t
3897 xpt_bus_deregister(path_id_t pathid)
3898 {
3899         struct cam_path bus_path;
3900         cam_status status;
3901
3902         status = xpt_compile_path(&bus_path, NULL, pathid,
3903                                   CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD);
3904         if (status != CAM_REQ_CMP)
3905                 return (status);
3906
3907         xpt_async(AC_LOST_DEVICE, &bus_path, NULL);
3908         xpt_async(AC_PATH_DEREGISTERED, &bus_path, NULL);
3909
3910         /* Release the reference count held while registered. */
3911         xpt_release_bus(bus_path.bus);
3912         xpt_release_path(&bus_path);
3913
3914         return (CAM_REQ_CMP);
3915 }
3916
3917 static path_id_t
3918 xptnextfreepathid(void)
3919 {
3920         struct cam_eb *bus;
3921         path_id_t pathid;
3922         const char *strval;
3923
3924         pathid = 0;
3925         mtx_lock(&xsoftc.xpt_topo_lock);
3926         bus = TAILQ_FIRST(&xsoftc.xpt_busses);
3927 retry:
3928         /* Find an unoccupied pathid */
3929         while (bus != NULL && bus->path_id <= pathid) {
3930                 if (bus->path_id == pathid)
3931                         pathid++;
3932                 bus = TAILQ_NEXT(bus, links);
3933         }
3934         mtx_unlock(&xsoftc.xpt_topo_lock);
3935
3936         /*
3937          * Ensure that this pathid is not reserved for
3938          * a bus that may be registered in the future.
3939          */
3940         if (resource_string_value("scbus", pathid, "at", &strval) == 0) {
3941                 ++pathid;
3942                 /* Start the search over */
3943                 mtx_lock(&xsoftc.xpt_topo_lock);
3944                 goto retry;
3945         }
3946         return (pathid);
3947 }
3948
3949 static path_id_t
3950 xptpathid(const char *sim_name, int sim_unit, int sim_bus)
3951 {
3952         path_id_t pathid;
3953         int i, dunit, val;
3954         char buf[32];
3955         const char *dname;
3956
3957         pathid = CAM_XPT_PATH_ID;
3958         snprintf(buf, sizeof(buf), "%s%d", sim_name, sim_unit);
3959         i = 0;
3960         while ((resource_find_match(&i, &dname, &dunit, "at", buf)) == 0) {
3961                 if (strcmp(dname, "scbus")) {
3962                         /* Avoid a bit of foot shooting. */
3963                         continue;
3964                 }
3965                 if (dunit < 0)          /* unwired?! */
3966                         continue;
3967                 if (resource_int_value("scbus", dunit, "bus", &val) == 0) {
3968                         if (sim_bus == val) {
3969                                 pathid = dunit;
3970                                 break;
3971                         }
3972                 } else if (sim_bus == 0) {
3973                         /* Unspecified matches bus 0 */
3974                         pathid = dunit;
3975                         break;
3976                 } else {
3977                         printf("Ambiguous scbus configuration for %s%d "
3978                                "bus %d, cannot wire down.  The kernel "
3979                                "config entry for scbus%d should "
3980                                "specify a controller bus.\n"
3981                                "Scbus will be assigned dynamically.\n",
3982                                sim_name, sim_unit, sim_bus, dunit);
3983                         break;
3984                 }
3985         }
3986
3987         if (pathid == CAM_XPT_PATH_ID)
3988                 pathid = xptnextfreepathid();
3989         return (pathid);
3990 }
3991
3992 static const char *
3993 xpt_async_string(u_int32_t async_code)
3994 {
3995
3996         switch (async_code) {
3997         case AC_BUS_RESET: return ("AC_BUS_RESET");
3998         case AC_UNSOL_RESEL: return ("AC_UNSOL_RESEL");
3999         case AC_SCSI_AEN: return ("AC_SCSI_AEN");
4000         case AC_SENT_BDR: return ("AC_SENT_BDR");
4001         case AC_PATH_REGISTERED: return ("AC_PATH_REGISTERED");
4002         case AC_PATH_DEREGISTERED: return ("AC_PATH_DEREGISTERED");
4003         case AC_FOUND_DEVICE: return ("AC_FOUND_DEVICE");
4004         case AC_LOST_DEVICE: return ("AC_LOST_DEVICE");
4005         case AC_TRANSFER_NEG: return ("AC_TRANSFER_NEG");
4006         case AC_INQ_CHANGED: return ("AC_INQ_CHANGED");
4007         case AC_GETDEV_CHANGED: return ("AC_GETDEV_CHANGED");
4008         case AC_CONTRACT: return ("AC_CONTRACT");
4009         }
4010         return ("AC_UNKNOWN");
4011 }
4012
4013 void
4014 xpt_async(u_int32_t async_code, struct cam_path *path, void *async_arg)
4015 {
4016         struct cam_eb *bus;
4017         struct cam_et *target, *next_target;
4018         struct cam_ed *device, *next_device;
4019
4020         mtx_assert(path->bus->sim->mtx, MA_OWNED);
4021         CAM_DEBUG(path, CAM_DEBUG_TRACE | CAM_DEBUG_INFO,
4022             ("xpt_async(%s)\n", xpt_async_string(async_code)));
4023
4024         /*
4025          * Most async events come from a CAM interrupt context.  In
4026          * a few cases, the error recovery code at the peripheral layer,
4027          * which may run from our SWI or a process context, may signal
4028          * deferred events with a call to xpt_async.
4029          */
4030
4031         bus = path->bus;
4032
4033         if (async_code == AC_BUS_RESET) {
4034                 /* Update our notion of when the last reset occurred */
4035                 microtime(&bus->last_reset);
4036         }
4037
4038         for (target = TAILQ_FIRST(&bus->et_entries);
4039              target != NULL;
4040              target = next_target) {
4041
4042                 next_target = TAILQ_NEXT(target, links);
4043
4044                 if (path->target != target
4045                  && path->target->target_id != CAM_TARGET_WILDCARD
4046                  && target->target_id != CAM_TARGET_WILDCARD)
4047                         continue;
4048
4049                 if (async_code == AC_SENT_BDR) {
4050                         /* Update our notion of when the last reset occurred */
4051                         microtime(&path->target->last_reset);
4052                 }
4053
4054                 for (device = TAILQ_FIRST(&target->ed_entries);
4055                      device != NULL;
4056                      device = next_device) {
4057
4058                         next_device = TAILQ_NEXT(device, links);
4059
4060                         if (path->device != device
4061                          && path->device->lun_id != CAM_LUN_WILDCARD
4062                          && device->lun_id != CAM_LUN_WILDCARD)
4063                                 continue;
4064                         /*
4065                          * The async callback could free the device.
4066                          * If it is a broadcast async, it doesn't hold
4067                          * device reference, so take our own reference.
4068                          */
4069                         xpt_acquire_device(device);
4070                         (*(bus->xport->async))(async_code, bus,
4071                                                target, device,
4072                                                async_arg);
4073
4074                         xpt_async_bcast(&device->asyncs, async_code,
4075                                         path, async_arg);
4076                         xpt_release_device(device);
4077                 }
4078         }
4079
4080         /*
4081          * If this wasn't a fully wildcarded async, tell all
4082          * clients that want all async events.
4083          */
4084         if (bus != xpt_periph->path->bus)
4085                 xpt_async_bcast(&xpt_periph->path->device->asyncs, async_code,
4086                                 path, async_arg);
4087 }
4088
4089 static void
4090 xpt_async_bcast(struct async_list *async_head,
4091                 u_int32_t async_code,
4092                 struct cam_path *path, void *async_arg)
4093 {
4094         struct async_node *cur_entry;
4095
4096         cur_entry = SLIST_FIRST(async_head);
4097         while (cur_entry != NULL) {
4098                 struct async_node *next_entry;
4099                 /*
4100                  * Grab the next list entry before we call the current
4101                  * entry's callback.  This is because the callback function
4102                  * can delete its async callback entry.
4103                  */
4104                 next_entry = SLIST_NEXT(cur_entry, links);
4105                 if ((cur_entry->event_enable & async_code) != 0)
4106                         cur_entry->callback(cur_entry->callback_arg,
4107                                             async_code, path,
4108                                             async_arg);
4109                 cur_entry = next_entry;
4110         }
4111 }
4112
4113 static void
4114 xpt_dev_async_default(u_int32_t async_code, struct cam_eb *bus,
4115                       struct cam_et *target, struct cam_ed *device,
4116                       void *async_arg)
4117 {
4118         printf("%s called\n", __func__);
4119 }
4120
4121 u_int32_t
4122 xpt_freeze_devq_rl(struct cam_path *path, cam_rl rl, u_int count)
4123 {
4124         struct cam_ed *dev = path->device;
4125
4126         mtx_assert(path->bus->sim->mtx, MA_OWNED);
4127         dev->sim->devq->alloc_openings +=
4128             cam_ccbq_freeze(&dev->ccbq, rl, count);
4129         /* Remove frozen device from allocq. */
4130         if (device_is_alloc_queued(dev) &&
4131             cam_ccbq_frozen(&dev->ccbq, CAM_PRIORITY_TO_RL(
4132              CAMQ_GET_PRIO(&dev->drvq)))) {
4133                 camq_remove(&dev->sim->devq->alloc_queue,
4134                     dev->alloc_ccb_entry.pinfo.index);
4135         }
4136         /* Remove frozen device from sendq. */
4137         if (device_is_send_queued(dev) &&
4138             cam_ccbq_frozen_top(&dev->ccbq)) {
4139                 camq_remove(&dev->sim->devq->send_queue,
4140                     dev->send_ccb_entry.pinfo.index);
4141         }
4142         return (dev->ccbq.queue.qfrozen_cnt[rl]);
4143 }
4144
4145 u_int32_t
4146 xpt_freeze_devq(struct cam_path *path, u_int count)
4147 {
4148
4149         return (xpt_freeze_devq_rl(path, 0, count));
4150 }
4151
4152 u_int32_t
4153 xpt_freeze_simq(struct cam_sim *sim, u_int count)
4154 {
4155
4156         mtx_assert(sim->mtx, MA_OWNED);
4157         sim->devq->send_queue.qfrozen_cnt[0] += count;
4158         return (sim->devq->send_queue.qfrozen_cnt[0]);
4159 }
4160
4161 static void
4162 xpt_release_devq_timeout(void *arg)
4163 {
4164         struct cam_ed *device;
4165
4166         device = (struct cam_ed *)arg;
4167
4168         xpt_release_devq_device(device, /*rl*/0, /*count*/1, /*run_queue*/TRUE);
4169 }
4170
4171 void
4172 xpt_release_devq(struct cam_path *path, u_int count, int run_queue)
4173 {
4174         mtx_assert(path->bus->sim->mtx, MA_OWNED);
4175
4176         xpt_release_devq_device(path->device, /*rl*/0, count, run_queue);
4177 }
4178
4179 void
4180 xpt_release_devq_rl(struct cam_path *path, cam_rl rl, u_int count, int run_queue)
4181 {
4182         mtx_assert(path->bus->sim->mtx, MA_OWNED);
4183
4184         xpt_release_devq_device(path->device, rl, count, run_queue);
4185 }
4186
4187 static void
4188 xpt_release_devq_device(struct cam_ed *dev, cam_rl rl, u_int count, int run_queue)
4189 {
4190
4191         if (count > dev->ccbq.queue.qfrozen_cnt[rl]) {
4192 #ifdef INVARIANTS
4193                 printf("xpt_release_devq(%d): requested %u > present %u\n",
4194                     rl, count, dev->ccbq.queue.qfrozen_cnt[rl]);
4195 #endif
4196                 count = dev->ccbq.queue.qfrozen_cnt[rl];
4197         }
4198         dev->sim->devq->alloc_openings -=
4199             cam_ccbq_release(&dev->ccbq, rl, count);
4200         if (cam_ccbq_frozen(&dev->ccbq, CAM_PRIORITY_TO_RL(
4201             CAMQ_GET_PRIO(&dev->drvq))) == 0) {
4202                 if (xpt_schedule_dev_allocq(dev->target->bus, dev))
4203                         xpt_run_dev_allocq(dev->target->bus);
4204         }
4205         if (cam_ccbq_frozen_top(&dev->ccbq) == 0) {
4206                 /*
4207                  * No longer need to wait for a successful
4208                  * command completion.
4209                  */
4210                 dev->flags &= ~CAM_DEV_REL_ON_COMPLETE;
4211                 /*
4212                  * Remove any timeouts that might be scheduled
4213                  * to release this queue.
4214                  */
4215                 if ((dev->flags & CAM_DEV_REL_TIMEOUT_PENDING) != 0) {
4216                         callout_stop(&dev->callout);
4217                         dev->flags &= ~CAM_DEV_REL_TIMEOUT_PENDING;
4218                 }
4219                 if (run_queue == 0)
4220                         return;
4221                 /*
4222                  * Now that we are unfrozen schedule the
4223                  * device so any pending transactions are
4224                  * run.
4225                  */
4226                 if (xpt_schedule_dev_sendq(dev->target->bus, dev))
4227                         xpt_run_dev_sendq(dev->target->bus);
4228         }
4229 }
4230
4231 void
4232 xpt_release_simq(struct cam_sim *sim, int run_queue)
4233 {
4234         struct  camq *sendq;
4235
4236         mtx_assert(sim->mtx, MA_OWNED);
4237         sendq = &(sim->devq->send_queue);
4238         if (sendq->qfrozen_cnt[0] <= 0) {
4239 #ifdef INVARIANTS
4240                 printf("xpt_release_simq: requested 1 > present %u\n",
4241                     sendq->qfrozen_cnt[0]);
4242 #endif
4243         } else
4244                 sendq->qfrozen_cnt[0]--;
4245         if (sendq->qfrozen_cnt[0] == 0) {
4246                 /*
4247                  * If there is a timeout scheduled to release this
4248                  * sim queue, remove it.  The queue frozen count is
4249                  * already at 0.
4250                  */
4251                 if ((sim->flags & CAM_SIM_REL_TIMEOUT_PENDING) != 0){
4252                         callout_stop(&sim->callout);
4253                         sim->flags &= ~CAM_SIM_REL_TIMEOUT_PENDING;
4254                 }
4255                 if (run_queue) {
4256                         struct cam_eb *bus;
4257
4258                         /*
4259                          * Now that we are unfrozen run the send queue.
4260                          */
4261                         bus = xpt_find_bus(sim->path_id);
4262                         xpt_run_dev_sendq(bus);
4263                         xpt_release_bus(bus);
4264                 }
4265         }
4266 }
4267
4268 /*
4269  * XXX Appears to be unused.
4270  */
4271 static void
4272 xpt_release_simq_timeout(void *arg)
4273 {
4274         struct cam_sim *sim;
4275
4276         sim = (struct cam_sim *)arg;
4277         xpt_release_simq(sim, /* run_queue */ TRUE);
4278 }
4279
4280 void
4281 xpt_done(union ccb *done_ccb)
4282 {
4283         struct cam_sim *sim;
4284         int     first;
4285
4286         CAM_DEBUG(done_ccb->ccb_h.path, CAM_DEBUG_TRACE, ("xpt_done\n"));
4287         if ((done_ccb->ccb_h.func_code & XPT_FC_QUEUED) != 0) {
4288                 /*
4289                  * Queue up the request for handling by our SWI handler
4290                  * any of the "non-immediate" type of ccbs.
4291                  */
4292                 sim = done_ccb->ccb_h.path->bus->sim;
4293                 TAILQ_INSERT_TAIL(&sim->sim_doneq, &done_ccb->ccb_h,
4294                     sim_links.tqe);
4295                 done_ccb->ccb_h.pinfo.index = CAM_DONEQ_INDEX;
4296                 if ((sim->flags & (CAM_SIM_ON_DONEQ | CAM_SIM_POLLED |
4297                     CAM_SIM_BATCH)) == 0) {
4298                         mtx_lock(&cam_simq_lock);
4299                         first = TAILQ_EMPTY(&cam_simq);
4300                         TAILQ_INSERT_TAIL(&cam_simq, sim, links);
4301                         mtx_unlock(&cam_simq_lock);
4302                         sim->flags |= CAM_SIM_ON_DONEQ;
4303                         if (first)
4304                                 swi_sched(cambio_ih, 0);
4305                 }
4306         }
4307 }
4308
4309 void
4310 xpt_batch_start(struct cam_sim *sim)
4311 {
4312
4313         KASSERT((sim->flags & CAM_SIM_BATCH) == 0, ("Batch flag already set"));
4314         sim->flags |= CAM_SIM_BATCH;
4315 }
4316
4317 void
4318 xpt_batch_done(struct cam_sim *sim)
4319 {
4320
4321         KASSERT((sim->flags & CAM_SIM_BATCH) != 0, ("Batch flag was not set"));
4322         sim->flags &= ~CAM_SIM_BATCH;
4323         if (!TAILQ_EMPTY(&sim->sim_doneq) &&
4324             (sim->flags & CAM_SIM_ON_DONEQ) == 0)
4325                 camisr_runqueue(&sim->sim_doneq);
4326 }
4327
4328 union ccb *
4329 xpt_alloc_ccb()
4330 {
4331         union ccb *new_ccb;
4332
4333         new_ccb = malloc(sizeof(*new_ccb), M_CAMXPT, M_ZERO|M_WAITOK);
4334         return (new_ccb);
4335 }
4336
4337 union ccb *
4338 xpt_alloc_ccb_nowait()
4339 {
4340         union ccb *new_ccb;
4341
4342         new_ccb = malloc(sizeof(*new_ccb), M_CAMXPT, M_ZERO|M_NOWAIT);
4343         return (new_ccb);
4344 }
4345
4346 void
4347 xpt_free_ccb(union ccb *free_ccb)
4348 {
4349         free(free_ccb, M_CAMXPT);
4350 }
4351
4352
4353
4354 /* Private XPT functions */
4355
4356 /*
4357  * Get a CAM control block for the caller. Charge the structure to the device
4358  * referenced by the path.  If the this device has no 'credits' then the
4359  * device already has the maximum number of outstanding operations under way
4360  * and we return NULL. If we don't have sufficient resources to allocate more
4361  * ccbs, we also return NULL.
4362  */
4363 static union ccb *
4364 xpt_get_ccb(struct cam_ed *device)
4365 {
4366         union ccb *new_ccb;
4367         struct cam_sim *sim;
4368
4369         sim = device->sim;
4370         if ((new_ccb = (union ccb *)SLIST_FIRST(&sim->ccb_freeq)) == NULL) {
4371                 new_ccb = xpt_alloc_ccb_nowait();
4372                 if (new_ccb == NULL) {
4373                         return (NULL);
4374                 }
4375                 if ((sim->flags & CAM_SIM_MPSAFE) == 0)
4376                         callout_handle_init(&new_ccb->ccb_h.timeout_ch);
4377                 SLIST_INSERT_HEAD(&sim->ccb_freeq, &new_ccb->ccb_h,
4378                                   xpt_links.sle);
4379                 sim->ccb_count++;
4380         }
4381         cam_ccbq_take_opening(&device->ccbq);
4382         SLIST_REMOVE_HEAD(&sim->ccb_freeq, xpt_links.sle);
4383         return (new_ccb);
4384 }
4385
4386 static void
4387 xpt_release_bus(struct cam_eb *bus)
4388 {
4389
4390         mtx_lock(&xsoftc.xpt_topo_lock);
4391         KASSERT(bus->refcount >= 1, ("bus->refcount >= 1"));
4392         if ((--bus->refcount == 0)
4393          && (TAILQ_FIRST(&bus->et_entries) == NULL)) {
4394                 TAILQ_REMOVE(&xsoftc.xpt_busses, bus, links);
4395                 xsoftc.bus_generation++;
4396                 mtx_unlock(&xsoftc.xpt_topo_lock);
4397                 cam_sim_release(bus->sim);
4398                 free(bus, M_CAMXPT);
4399         } else
4400                 mtx_unlock(&xsoftc.xpt_topo_lock);
4401 }
4402
4403 static struct cam_et *
4404 xpt_alloc_target(struct cam_eb *bus, target_id_t target_id)
4405 {
4406         struct cam_et *target;
4407
4408         target = (struct cam_et *)malloc(sizeof(*target), M_CAMXPT, M_NOWAIT);
4409         if (target != NULL) {
4410                 struct cam_et *cur_target;
4411
4412                 TAILQ_INIT(&target->ed_entries);
4413                 target->bus = bus;
4414                 target->target_id = target_id;
4415                 target->refcount = 1;
4416                 target->generation = 0;
4417                 target->luns = NULL;
4418                 timevalclear(&target->last_reset);
4419                 /*
4420                  * Hold a reference to our parent bus so it
4421                  * will not go away before we do.
4422                  */
4423                 mtx_lock(&xsoftc.xpt_topo_lock);
4424                 bus->refcount++;
4425                 mtx_unlock(&xsoftc.xpt_topo_lock);
4426
4427                 /* Insertion sort into our bus's target list */
4428                 cur_target = TAILQ_FIRST(&bus->et_entries);
4429                 while (cur_target != NULL && cur_target->target_id < target_id)
4430                         cur_target = TAILQ_NEXT(cur_target, links);
4431
4432                 if (cur_target != NULL) {
4433                         TAILQ_INSERT_BEFORE(cur_target, target, links);
4434                 } else {
4435                         TAILQ_INSERT_TAIL(&bus->et_entries, target, links);
4436                 }
4437                 bus->generation++;
4438         }
4439         return (target);
4440 }
4441
4442 static void
4443 xpt_release_target(struct cam_et *target)
4444 {
4445
4446         if (target->refcount == 1) {
4447                 if (TAILQ_FIRST(&target->ed_entries) == NULL) {
4448                         TAILQ_REMOVE(&target->bus->et_entries, target, links);
4449                         target->bus->generation++;
4450                         xpt_release_bus(target->bus);
4451                         if (target->luns)
4452                                 free(target->luns, M_CAMXPT);
4453                         free(target, M_CAMXPT);
4454                 }
4455         } else
4456                 target->refcount--;
4457 }
4458
4459 static struct cam_ed *
4460 xpt_alloc_device_default(struct cam_eb *bus, struct cam_et *target,
4461                          lun_id_t lun_id)
4462 {
4463         struct cam_ed *device, *cur_device;
4464
4465         device = xpt_alloc_device(bus, target, lun_id);
4466         if (device == NULL)
4467                 return (NULL);
4468
4469         device->mintags = 1;
4470         device->maxtags = 1;
4471         bus->sim->max_ccbs += device->ccbq.devq_openings;
4472         cur_device = TAILQ_FIRST(&target->ed_entries);
4473         while (cur_device != NULL && cur_device->lun_id < lun_id)
4474                 cur_device = TAILQ_NEXT(cur_device, links);
4475         if (cur_device != NULL) {
4476                 TAILQ_INSERT_BEFORE(cur_device, device, links);
4477         } else {
4478                 TAILQ_INSERT_TAIL(&target->ed_entries, device, links);
4479         }
4480         target->generation++;
4481
4482         return (device);
4483 }
4484
4485 struct cam_ed *
4486 xpt_alloc_device(struct cam_eb *bus, struct cam_et *target, lun_id_t lun_id)
4487 {
4488         struct     cam_ed *device;
4489         struct     cam_devq *devq;
4490         cam_status status;
4491
4492         /* Make space for us in the device queue on our bus */
4493         devq = bus->sim->devq;
4494         status = cam_devq_resize(devq, devq->alloc_queue.array_size + 1);
4495
4496         if (status != CAM_REQ_CMP) {
4497                 device = NULL;
4498         } else {
4499                 device = (struct cam_ed *)malloc(sizeof(*device),
4500                                                  M_CAMXPT, M_NOWAIT);
4501         }
4502
4503         if (device != NULL) {
4504                 cam_init_pinfo(&device->alloc_ccb_entry.pinfo);
4505                 device->alloc_ccb_entry.device = device;
4506                 cam_init_pinfo(&device->send_ccb_entry.pinfo);
4507                 device->send_ccb_entry.device = device;
4508                 device->target = target;
4509                 device->lun_id = lun_id;
4510                 device->sim = bus->sim;
4511                 /* Initialize our queues */
4512                 if (camq_init(&device->drvq, 0) != 0) {
4513                         free(device, M_CAMXPT);
4514                         return (NULL);
4515                 }
4516                 if (cam_ccbq_init(&device->ccbq,
4517                                   bus->sim->max_dev_openings) != 0) {
4518                         camq_fini(&device->drvq);
4519                         free(device, M_CAMXPT);
4520                         return (NULL);
4521                 }
4522                 SLIST_INIT(&device->asyncs);
4523                 SLIST_INIT(&device->periphs);
4524                 device->generation = 0;
4525                 device->owner = NULL;
4526                 device->flags = CAM_DEV_UNCONFIGURED;
4527                 device->tag_delay_count = 0;
4528                 device->tag_saved_openings = 0;
4529                 device->refcount = 1;
4530                 callout_init_mtx(&device->callout, bus->sim->mtx, 0);
4531
4532                 /*
4533                  * Hold a reference to our parent target so it
4534                  * will not go away before we do.
4535                  */
4536                 target->refcount++;
4537
4538         }
4539         return (device);
4540 }
4541
4542 void
4543 xpt_acquire_device(struct cam_ed *device)
4544 {
4545
4546         device->refcount++;
4547 }
4548
4549 void
4550 xpt_release_device(struct cam_ed *device)
4551 {
4552
4553         if (device->refcount == 1) {
4554                 struct cam_devq *devq;
4555
4556                 if (device->alloc_ccb_entry.pinfo.index != CAM_UNQUEUED_INDEX
4557                  || device->send_ccb_entry.pinfo.index != CAM_UNQUEUED_INDEX)
4558                         panic("Removing device while still queued for ccbs");
4559
4560                 if ((device->flags & CAM_DEV_REL_TIMEOUT_PENDING) != 0)
4561                         callout_stop(&device->callout);
4562
4563                 TAILQ_REMOVE(&device->target->ed_entries, device,links);
4564                 device->target->generation++;
4565                 device->target->bus->sim->max_ccbs -= device->ccbq.devq_openings;
4566                 /* Release our slot in the devq */
4567                 devq = device->target->bus->sim->devq;
4568                 cam_devq_resize(devq, devq->alloc_queue.array_size - 1);
4569                 camq_fini(&device->drvq);
4570                 cam_ccbq_fini(&device->ccbq);
4571                 xpt_release_target(device->target);
4572                 free(device, M_CAMXPT);
4573         } else
4574                 device->refcount--;
4575 }
4576
4577 u_int32_t
4578 xpt_dev_ccbq_resize(struct cam_path *path, int newopenings)
4579 {
4580         int     diff;
4581         int     result;
4582         struct  cam_ed *dev;
4583
4584         dev = path->device;
4585
4586         diff = newopenings - (dev->ccbq.dev_active + dev->ccbq.dev_openings);
4587         result = cam_ccbq_resize(&dev->ccbq, newopenings);
4588         if (result == CAM_REQ_CMP && (diff < 0)) {
4589                 dev->flags |= CAM_DEV_RESIZE_QUEUE_NEEDED;
4590         }
4591         if ((dev->flags & CAM_DEV_TAG_AFTER_COUNT) != 0
4592          || (dev->inq_flags & SID_CmdQue) != 0)
4593                 dev->tag_saved_openings = newopenings;
4594         /* Adjust the global limit */
4595         dev->sim->max_ccbs += diff;
4596         return (result);
4597 }
4598
4599 static struct cam_eb *
4600 xpt_find_bus(path_id_t path_id)
4601 {
4602         struct cam_eb *bus;
4603
4604         mtx_lock(&xsoftc.xpt_topo_lock);
4605         for (bus = TAILQ_FIRST(&xsoftc.xpt_busses);
4606              bus != NULL;
4607              bus = TAILQ_NEXT(bus, links)) {
4608                 if (bus->path_id == path_id) {
4609                         bus->refcount++;
4610                         break;
4611                 }
4612         }
4613         mtx_unlock(&xsoftc.xpt_topo_lock);
4614         return (bus);
4615 }
4616
4617 static struct cam_et *
4618 xpt_find_target(struct cam_eb *bus, target_id_t target_id)
4619 {
4620         struct cam_et *target;
4621
4622         for (target = TAILQ_FIRST(&bus->et_entries);
4623              target != NULL;
4624              target = TAILQ_NEXT(target, links)) {
4625                 if (target->target_id == target_id) {
4626                         target->refcount++;
4627                         break;
4628                 }
4629         }
4630         return (target);
4631 }
4632
4633 static struct cam_ed *
4634 xpt_find_device(struct cam_et *target, lun_id_t lun_id)
4635 {
4636         struct cam_ed *device;
4637
4638         for (device = TAILQ_FIRST(&target->ed_entries);
4639              device != NULL;
4640              device = TAILQ_NEXT(device, links)) {
4641                 if (device->lun_id == lun_id) {
4642                         device->refcount++;
4643                         break;
4644                 }
4645         }
4646         return (device);
4647 }
4648
4649 void
4650 xpt_start_tags(struct cam_path *path)
4651 {
4652         struct ccb_relsim crs;
4653         struct cam_ed *device;
4654         struct cam_sim *sim;
4655         int    newopenings;
4656
4657         device = path->device;
4658         sim = path->bus->sim;
4659         device->flags &= ~CAM_DEV_TAG_AFTER_COUNT;
4660         xpt_freeze_devq(path, /*count*/1);
4661         device->inq_flags |= SID_CmdQue;
4662         if (device->tag_saved_openings != 0)
4663                 newopenings = device->tag_saved_openings;
4664         else
4665                 newopenings = min(device->maxtags,
4666                                   sim->max_tagged_dev_openings);
4667         xpt_dev_ccbq_resize(path, newopenings);
4668         xpt_async(AC_GETDEV_CHANGED, path, NULL);
4669         xpt_setup_ccb(&crs.ccb_h, path, CAM_PRIORITY_NORMAL);
4670         crs.ccb_h.func_code = XPT_REL_SIMQ;
4671         crs.release_flags = RELSIM_RELEASE_AFTER_QEMPTY;
4672         crs.openings
4673             = crs.release_timeout
4674             = crs.qfrozen_cnt
4675             = 0;
4676         xpt_action((union ccb *)&crs);
4677 }
4678
4679 void
4680 xpt_stop_tags(struct cam_path *path)
4681 {
4682         struct ccb_relsim crs;
4683         struct cam_ed *device;
4684         struct cam_sim *sim;
4685
4686         device = path->device;
4687         sim = path->bus->sim;
4688         device->flags &= ~CAM_DEV_TAG_AFTER_COUNT;
4689         device->tag_delay_count = 0;
4690         xpt_freeze_devq(path, /*count*/1);
4691         device->inq_flags &= ~SID_CmdQue;
4692         xpt_dev_ccbq_resize(path, sim->max_dev_openings);
4693         xpt_async(AC_GETDEV_CHANGED, path, NULL);
4694         xpt_setup_ccb(&crs.ccb_h, path, CAM_PRIORITY_NORMAL);
4695         crs.ccb_h.func_code = XPT_REL_SIMQ;
4696         crs.release_flags = RELSIM_RELEASE_AFTER_QEMPTY;
4697         crs.openings
4698             = crs.release_timeout
4699             = crs.qfrozen_cnt
4700             = 0;
4701         xpt_action((union ccb *)&crs);
4702 }
4703
4704 static void
4705 xpt_boot_delay(void *arg)
4706 {
4707
4708         xpt_release_boot();
4709 }
4710
4711 static void
4712 xpt_config(void *arg)
4713 {
4714         /*
4715          * Now that interrupts are enabled, go find our devices
4716          */
4717
4718         /* Setup debugging path */
4719         if (cam_dflags != CAM_DEBUG_NONE) {
4720                 /*
4721                  * Locking is specifically omitted here.  No SIMs have
4722                  * registered yet, so xpt_create_path will only be searching
4723                  * empty lists of targets and devices.
4724                  */
4725                 if (xpt_create_path(&cam_dpath, xpt_periph,
4726                                     CAM_DEBUG_BUS, CAM_DEBUG_TARGET,
4727                                     CAM_DEBUG_LUN) != CAM_REQ_CMP) {
4728                         printf("xpt_config: xpt_create_path() failed for debug"
4729                                " target %d:%d:%d, debugging disabled\n",
4730                                CAM_DEBUG_BUS, CAM_DEBUG_TARGET, CAM_DEBUG_LUN);
4731                         cam_dflags = CAM_DEBUG_NONE;
4732                 }
4733         } else
4734                 cam_dpath = NULL;
4735
4736         periphdriver_init(1);
4737         xpt_hold_boot();
4738         callout_init(&xsoftc.boot_callout, 1);
4739         callout_reset(&xsoftc.boot_callout, hz * xsoftc.boot_delay / 1000,
4740             xpt_boot_delay, NULL);
4741         /* Fire up rescan thread. */
4742         if (kproc_create(xpt_scanner_thread, NULL, NULL, 0, 0, "xpt_thrd")) {
4743                 printf("xpt_init: failed to create rescan thread\n");
4744         }
4745 }
4746
4747 void
4748 xpt_hold_boot(void)
4749 {
4750         xpt_lock_buses();
4751         xsoftc.buses_to_config++;
4752         xpt_unlock_buses();
4753 }
4754
4755 void
4756 xpt_release_boot(void)
4757 {
4758         xpt_lock_buses();
4759         xsoftc.buses_to_config--;
4760         if (xsoftc.buses_to_config == 0 && xsoftc.buses_config_done == 0) {
4761                 struct  xpt_task *task;
4762
4763                 xsoftc.buses_config_done = 1;
4764                 xpt_unlock_buses();
4765                 /* Call manually because we don't have any busses */
4766                 task = malloc(sizeof(struct xpt_task), M_CAMXPT, M_NOWAIT);
4767                 if (task != NULL) {
4768                         TASK_INIT(&task->task, 0, xpt_finishconfig_task, task);
4769                         taskqueue_enqueue(taskqueue_thread, &task->task);
4770                 }
4771         } else
4772                 xpt_unlock_buses();
4773 }
4774
4775 /*
4776  * If the given device only has one peripheral attached to it, and if that
4777  * peripheral is the passthrough driver, announce it.  This insures that the
4778  * user sees some sort of announcement for every peripheral in their system.
4779  */
4780 static int
4781 xptpassannouncefunc(struct cam_ed *device, void *arg)
4782 {
4783         struct cam_periph *periph;
4784         int i;
4785
4786         for (periph = SLIST_FIRST(&device->periphs), i = 0; periph != NULL;
4787              periph = SLIST_NEXT(periph, periph_links), i++);
4788
4789         periph = SLIST_FIRST(&device->periphs);
4790         if ((i == 1)
4791          && (strncmp(periph->periph_name, "pass", 4) == 0))
4792                 xpt_announce_periph(periph, NULL);
4793
4794         return(1);
4795 }
4796
4797 static void
4798 xpt_finishconfig_task(void *context, int pending)
4799 {
4800
4801         periphdriver_init(2);
4802         /*
4803          * Check for devices with no "standard" peripheral driver
4804          * attached.  For any devices like that, announce the
4805          * passthrough driver so the user will see something.
4806          */
4807         xpt_for_all_devices(xptpassannouncefunc, NULL);
4808
4809         /* Release our hook so that the boot can continue. */
4810         config_intrhook_disestablish(xsoftc.xpt_config_hook);
4811         free(xsoftc.xpt_config_hook, M_CAMXPT);
4812         xsoftc.xpt_config_hook = NULL;
4813
4814         free(context, M_CAMXPT);
4815 }
4816
4817 cam_status
4818 xpt_register_async(int event, ac_callback_t *cbfunc, void *cbarg,
4819                    struct cam_path *path)
4820 {
4821         struct ccb_setasync csa;
4822         cam_status status;
4823         int xptpath = 0;
4824
4825         if (path == NULL) {
4826                 mtx_lock(&xsoftc.xpt_lock);
4827                 status = xpt_create_path(&path, /*periph*/NULL, CAM_XPT_PATH_ID,
4828                                          CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD);
4829                 if (status != CAM_REQ_CMP) {
4830                         mtx_unlock(&xsoftc.xpt_lock);
4831                         return (status);
4832                 }
4833                 xptpath = 1;
4834         }
4835
4836         xpt_setup_ccb(&csa.ccb_h, path, CAM_PRIORITY_NORMAL);
4837         csa.ccb_h.func_code = XPT_SASYNC_CB;
4838         csa.event_enable = event;
4839         csa.callback = cbfunc;
4840         csa.callback_arg = cbarg;
4841         xpt_action((union ccb *)&csa);
4842         status = csa.ccb_h.status;
4843         if (xptpath) {
4844                 xpt_free_path(path);
4845                 mtx_unlock(&xsoftc.xpt_lock);
4846
4847                 if ((status == CAM_REQ_CMP) &&
4848                     (csa.event_enable & AC_FOUND_DEVICE)) {
4849                         /*
4850                          * Get this peripheral up to date with all
4851                          * the currently existing devices.
4852                          */
4853                         xpt_for_all_devices(xptsetasyncfunc, &csa);
4854                 }
4855                 if ((status == CAM_REQ_CMP) &&
4856                     (csa.event_enable & AC_PATH_REGISTERED)) {
4857                         /*
4858                          * Get this peripheral up to date with all
4859                          * the currently existing busses.
4860                          */
4861                         xpt_for_all_busses(xptsetasyncbusfunc, &csa);
4862                 }
4863         }
4864         return (status);
4865 }
4866
4867 static void
4868 xptaction(struct cam_sim *sim, union ccb *work_ccb)
4869 {
4870         CAM_DEBUG(work_ccb->ccb_h.path, CAM_DEBUG_TRACE, ("xptaction\n"));
4871
4872         switch (work_ccb->ccb_h.func_code) {
4873         /* Common cases first */
4874         case XPT_PATH_INQ:              /* Path routing inquiry */
4875         {
4876                 struct ccb_pathinq *cpi;
4877
4878                 cpi = &work_ccb->cpi;
4879                 cpi->version_num = 1; /* XXX??? */
4880                 cpi->hba_inquiry = 0;
4881                 cpi->target_sprt = 0;
4882                 cpi->hba_misc = 0;
4883                 cpi->hba_eng_cnt = 0;
4884                 cpi->max_target = 0;
4885                 cpi->max_lun = 0;
4886                 cpi->initiator_id = 0;
4887                 strncpy(cpi->sim_vid, "FreeBSD", SIM_IDLEN);
4888                 strncpy(cpi->hba_vid, "", HBA_IDLEN);
4889                 strncpy(cpi->dev_name, sim->sim_name, DEV_IDLEN);
4890                 cpi->unit_number = sim->unit_number;
4891                 cpi->bus_id = sim->bus_id;
4892                 cpi->base_transfer_speed = 0;
4893                 cpi->protocol = PROTO_UNSPECIFIED;
4894                 cpi->protocol_version = PROTO_VERSION_UNSPECIFIED;
4895                 cpi->transport = XPORT_UNSPECIFIED;
4896                 cpi->transport_version = XPORT_VERSION_UNSPECIFIED;
4897                 cpi->ccb_h.status = CAM_REQ_CMP;
4898                 xpt_done(work_ccb);
4899                 break;
4900         }
4901         default:
4902                 work_ccb->ccb_h.status = CAM_REQ_INVALID;
4903                 xpt_done(work_ccb);
4904                 break;
4905         }
4906 }
4907
4908 /*
4909  * The xpt as a "controller" has no interrupt sources, so polling
4910  * is a no-op.
4911  */
4912 static void
4913 xptpoll(struct cam_sim *sim)
4914 {
4915 }
4916
4917 void
4918 xpt_lock_buses(void)
4919 {
4920         mtx_lock(&xsoftc.xpt_topo_lock);
4921 }
4922
4923 void
4924 xpt_unlock_buses(void)
4925 {
4926         mtx_unlock(&xsoftc.xpt_topo_lock);
4927 }
4928
4929 static void
4930 camisr(void *dummy)
4931 {
4932         cam_simq_t queue;
4933         struct cam_sim *sim;
4934
4935         mtx_lock(&cam_simq_lock);
4936         TAILQ_INIT(&queue);
4937         while (!TAILQ_EMPTY(&cam_simq)) {
4938                 TAILQ_CONCAT(&queue, &cam_simq, links);
4939                 mtx_unlock(&cam_simq_lock);
4940
4941                 while ((sim = TAILQ_FIRST(&queue)) != NULL) {
4942                         TAILQ_REMOVE(&queue, sim, links);
4943                         CAM_SIM_LOCK(sim);
4944                         camisr_runqueue(&sim->sim_doneq);
4945                         sim->flags &= ~CAM_SIM_ON_DONEQ;
4946                         CAM_SIM_UNLOCK(sim);
4947                 }
4948                 mtx_lock(&cam_simq_lock);
4949         }
4950         mtx_unlock(&cam_simq_lock);
4951 }
4952
4953 static void
4954 camisr_runqueue(void *V_queue)
4955 {
4956         cam_isrq_t *queue = V_queue;
4957         struct  ccb_hdr *ccb_h;
4958
4959         while ((ccb_h = TAILQ_FIRST(queue)) != NULL) {
4960                 int     runq;
4961
4962                 TAILQ_REMOVE(queue, ccb_h, sim_links.tqe);
4963                 ccb_h->pinfo.index = CAM_UNQUEUED_INDEX;
4964
4965                 CAM_DEBUG(ccb_h->path, CAM_DEBUG_TRACE,
4966                           ("camisr\n"));
4967
4968                 runq = FALSE;
4969
4970                 if (ccb_h->flags & CAM_HIGH_POWER) {
4971                         struct highpowerlist    *hphead;
4972                         union ccb               *send_ccb;
4973
4974                         mtx_lock(&xsoftc.xpt_lock);
4975                         hphead = &xsoftc.highpowerq;
4976
4977                         send_ccb = (union ccb *)STAILQ_FIRST(hphead);
4978
4979                         /*
4980                          * Increment the count since this command is done.
4981                          */
4982                         xsoftc.num_highpower++;
4983
4984                         /*
4985                          * Any high powered commands queued up?
4986                          */
4987                         if (send_ccb != NULL) {
4988
4989                                 STAILQ_REMOVE_HEAD(hphead, xpt_links.stqe);
4990                                 mtx_unlock(&xsoftc.xpt_lock);
4991
4992                                 xpt_release_devq(send_ccb->ccb_h.path,
4993                                                  /*count*/1, /*runqueue*/TRUE);
4994                         } else
4995                                 mtx_unlock(&xsoftc.xpt_lock);
4996                 }
4997
4998                 if ((ccb_h->func_code & XPT_FC_USER_CCB) == 0) {
4999                         struct cam_ed *dev;
5000
5001                         dev = ccb_h->path->device;
5002
5003                         cam_ccbq_ccb_done(&dev->ccbq, (union ccb *)ccb_h);
5004                         ccb_h->path->bus->sim->devq->send_active--;
5005                         ccb_h->path->bus->sim->devq->send_openings++;
5006                         runq = TRUE;
5007
5008                         if (((dev->flags & CAM_DEV_REL_ON_QUEUE_EMPTY) != 0
5009                           && (dev->ccbq.dev_active == 0))) {
5010                                 dev->flags &= ~CAM_DEV_REL_ON_QUEUE_EMPTY;
5011                                 xpt_release_devq(ccb_h->path, /*count*/1,
5012                                                  /*run_queue*/FALSE);
5013                         }
5014
5015                         if (((dev->flags & CAM_DEV_REL_ON_COMPLETE) != 0
5016                           && (ccb_h->status&CAM_STATUS_MASK) != CAM_REQUEUE_REQ)) {
5017                                 dev->flags &= ~CAM_DEV_REL_ON_COMPLETE;
5018                                 xpt_release_devq(ccb_h->path, /*count*/1,
5019                                                  /*run_queue*/FALSE);
5020                         }
5021
5022                         if ((dev->flags & CAM_DEV_TAG_AFTER_COUNT) != 0
5023                          && (--dev->tag_delay_count == 0))
5024                                 xpt_start_tags(ccb_h->path);
5025                         if (!device_is_send_queued(dev))
5026                                 xpt_schedule_dev_sendq(ccb_h->path->bus, dev);
5027                 }
5028
5029                 if (ccb_h->status & CAM_RELEASE_SIMQ) {
5030                         xpt_release_simq(ccb_h->path->bus->sim,
5031                                          /*run_queue*/TRUE);
5032                         ccb_h->status &= ~CAM_RELEASE_SIMQ;
5033                         runq = FALSE;
5034                 }
5035
5036                 if ((ccb_h->flags & CAM_DEV_QFRZDIS)
5037                  && (ccb_h->status & CAM_DEV_QFRZN)) {
5038                         xpt_release_devq(ccb_h->path, /*count*/1,
5039                                          /*run_queue*/TRUE);
5040                         ccb_h->status &= ~CAM_DEV_QFRZN;
5041                 } else if (runq) {
5042                         xpt_run_dev_sendq(ccb_h->path->bus);
5043                 }
5044
5045                 /* Call the peripheral driver's callback */
5046                 (*ccb_h->cbfcnp)(ccb_h->path->periph, (union ccb *)ccb_h);
5047         }
5048 }