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