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 #ifdef PC98
  53 #include <pc98/pc98/pc98_machdep.h>     /* geometry translation */
  54 #endif
  55
  56 #include <cam/cam.h>
  57 #include <cam/cam_ccb.h>
  58 #include <cam/cam_periph.h>
  59 #include <cam/cam_queue.h>
  60 #include <cam/cam_sim.h>
  61 #include <cam/cam_xpt.h>
  62 #include <cam/cam_xpt_sim.h>
  63 #include <cam/cam_xpt_periph.h>
  64 #include <cam/cam_xpt_internal.h>
  65 #include <cam/cam_debug.h>
  66
  67 #include <cam/scsi/scsi_all.h>
  68 #include <cam/scsi/scsi_message.h>
  69 #include <cam/scsi/scsi_pass.h>
  70 #include <machine/stdarg.h>     /* for xpt_print below */
  71 #include "opt_cam.h"
  72
  73 /*
  74  * This is the maximum number of high powered commands (e.g. start unit)
  75  * that can be outstanding at a particular time.
  76  */
  77 #ifndef CAM_MAX_HIGHPOWER
  78 #define CAM_MAX_HIGHPOWER  4
  79 #endif
  80
  81 /* Datastructures internal to the xpt layer */
  82 MALLOC_DEFINE(M_CAMXPT, "CAM XPT", "CAM XPT buffers");
  83
  84 /* Object for defering XPT actions to a taskqueue */
  85 struct xpt_task {
  86         struct task     task;
  87         void            *data1;
  88         uintptr_t       data2;
  89 };
  90
  91 typedef enum {
  92         XPT_FLAG_OPEN           = 0x01
  93 } xpt_flags;
  94
  95 struct xpt_softc {
  96         xpt_flags               flags;
  97         u_int32_t               xpt_generation;
  98
  99         /* number of high powered commands that can go through right now */
 100         STAILQ_HEAD(highpowerlist, ccb_hdr)     highpowerq;
 101         int                     num_highpower;
 102
 103         /* queue for handling async rescan requests. */
 104         TAILQ_HEAD(, ccb_hdr) ccb_scanq;
 105         int buses_to_config;
 106         int buses_config_done;
 107
 108         /* Registered busses */
 109         TAILQ_HEAD(,cam_eb)     xpt_busses;
 110         u_int                   bus_generation;
 111
 112         struct intr_config_hook *xpt_config_hook;
 113
 114         int                     boot_delay;
 115         struct callout          boot_callout;
 116
 117         struct mtx              xpt_topo_lock;
 118         struct mtx              xpt_lock;
 119 };
 120
 121 typedef enum {
 122         DM_RET_COPY             = 0x01,
 123         DM_RET_FLAG_MASK        = 0x0f,
 124         DM_RET_NONE             = 0x00,
 125         DM_RET_STOP             = 0x10,
 126         DM_RET_DESCEND          = 0x20,
 127         DM_RET_ERROR            = 0x30,
 128         DM_RET_ACTION_MASK      = 0xf0
 129 } dev_match_ret;
 130
 131 typedef enum {
 132         XPT_DEPTH_BUS,
 133         XPT_DEPTH_TARGET,
 134         XPT_DEPTH_DEVICE,
 135         XPT_DEPTH_PERIPH
 136 } xpt_traverse_depth;
 137
 138 struct xpt_traverse_config {
 139         xpt_traverse_depth      depth;
 140         void                    *tr_func;
 141         void                    *tr_arg;
 142 };
 143
 144 typedef int     xpt_busfunc_t (struct cam_eb *bus, void *arg);
 145 typedef int     xpt_targetfunc_t (struct cam_et *target, void *arg);
 146 typedef int     xpt_devicefunc_t (struct cam_ed *device, void *arg);
 147 typedef int     xpt_periphfunc_t (struct cam_periph *periph, void *arg);
 148 typedef int     xpt_pdrvfunc_t (struct periph_driver **pdrv, void *arg);
 149
 150 /* Transport layer configuration information */
 151 static struct xpt_softc xsoftc;
 152
 153 TUNABLE_INT("kern.cam.boot_delay", &xsoftc.boot_delay);
 154 SYSCTL_INT(_kern_cam, OID_AUTO, boot_delay, CTLFLAG_RDTUN,
 155            &xsoftc.boot_delay, 0, "Bus registration wait time");
 156
 157 /* Queues for our software interrupt handler */
 158 typedef TAILQ_HEAD(cam_isrq, ccb_hdr) cam_isrq_t;
 159 typedef TAILQ_HEAD(cam_simq, cam_sim) cam_simq_t;
 160 static cam_simq_t cam_simq;
 161 static struct mtx cam_simq_lock;
 162
 163 /* Pointers to software interrupt handlers */
 164 static void *cambio_ih;
 165
 166 struct cam_periph *xpt_periph;
 167
 168 static periph_init_t xpt_periph_init;
 169
 170 static struct periph_driver xpt_driver =
 171 {
 172         xpt_periph_init, "xpt",
 173         TAILQ_HEAD_INITIALIZER(xpt_driver.units), /* generation */ 0,
 174         CAM_PERIPH_DRV_EARLY
 175 };
 176
 177 PERIPHDRIVER_DECLARE(xpt, xpt_driver);
 178
 179 static d_open_t xptopen;
 180 static d_close_t xptclose;
 181 static d_ioctl_t xptioctl;
 182
 183 static struct cdevsw xpt_cdevsw = {
 184         .d_version =    D_VERSION,
 185         .d_flags =      0,
 186         .d_open =       xptopen,
 187         .d_close =      xptclose,
 188         .d_ioctl =      xptioctl,
 189         .d_name =       "xpt",
 190 };
 191
 192 /* Storage for debugging datastructures */
 193 #ifdef  CAMDEBUG
 194 struct cam_path *cam_dpath;
 195 u_int32_t cam_dflags;
 196 u_int32_t cam_debug_delay;
 197 #endif
 198
 199 /* Our boot-time initialization hook */
 200 static int cam_module_event_handler(module_t, int /*modeventtype_t*/, void *);
 201
 202 static moduledata_t cam_moduledata = {
 203         "cam",
 204         cam_module_event_handler,
 205         NULL
 206 };
 207
 208 static int      xpt_init(void *);
 209
 210 DECLARE_MODULE(cam, cam_moduledata, SI_SUB_CONFIGURE, SI_ORDER_SECOND);
 211 MODULE_VERSION(cam, 1);
 212
 213
 214 static void             xpt_async_bcast(struct async_list *async_head,
 215                                         u_int32_t async_code,
 216                                         struct cam_path *path,
 217                                         void *async_arg);
 218 static path_id_t xptnextfreepathid(void);
 219 static path_id_t xptpathid(const char *sim_name, int sim_unit, int sim_bus);
 220 static union ccb *xpt_get_ccb(struct cam_ed *device);
 221 static void      xpt_run_dev_allocq(struct cam_eb *bus);
 222 static void      xpt_run_dev_sendq(struct cam_eb *bus);
 223 static timeout_t xpt_release_devq_timeout;
 224 static void      xpt_release_simq_timeout(void *arg) __unused;
 225 static void      xpt_release_bus(struct cam_eb *bus);
 226 static void      xpt_release_devq_device(struct cam_ed *dev, cam_rl rl,
 227                     u_int count, int run_queue);
 228 static struct cam_et*
 229                  xpt_alloc_target(struct cam_eb *bus, target_id_t target_id);
 230 static void      xpt_release_target(struct cam_et *target);
 231 static struct cam_eb*
 232                  xpt_find_bus(path_id_t path_id);
 233 static struct cam_et*
 234                  xpt_find_target(struct cam_eb *bus, target_id_t target_id);
 235 static struct cam_ed*
 236                  xpt_find_device(struct cam_et *target, lun_id_t lun_id);
 237 static void      xpt_config(void *arg);
 238 static xpt_devicefunc_t xptpassannouncefunc;
 239 static void      xptaction(struct cam_sim *sim, union ccb *work_ccb);
 240 static void      xptpoll(struct cam_sim *sim);
 241 static void      camisr(void *);
 242 static void      camisr_runqueue(void *);
 243 static dev_match_ret    xptbusmatch(struct dev_match_pattern *patterns,
 244                                     u_int num_patterns, struct cam_eb *bus);
 245 static dev_match_ret    xptdevicematch(struct dev_match_pattern *patterns,
 246                                        u_int num_patterns,
 247                                        struct cam_ed *device);
 248 static dev_match_ret    xptperiphmatch(struct dev_match_pattern *patterns,
 249                                        u_int num_patterns,
 250                                        struct cam_periph *periph);
 251 static xpt_busfunc_t    xptedtbusfunc;
 252 static xpt_targetfunc_t xptedttargetfunc;
 253 static xpt_devicefunc_t xptedtdevicefunc;
 254 static xpt_periphfunc_t xptedtperiphfunc;
 255 static xpt_pdrvfunc_t   xptplistpdrvfunc;
 256 static xpt_periphfunc_t xptplistperiphfunc;
 257 static int              xptedtmatch(struct ccb_dev_match *cdm);
 258 static int              xptperiphlistmatch(struct ccb_dev_match *cdm);
 259 static int              xptbustraverse(struct cam_eb *start_bus,
 260                                        xpt_busfunc_t *tr_func, void *arg);
 261 static int              xpttargettraverse(struct cam_eb *bus,
 262                                           struct cam_et *start_target,
 263                                           xpt_targetfunc_t *tr_func, void *arg);
 264 static int              xptdevicetraverse(struct cam_et *target,
 265                                           struct cam_ed *start_device,
 266                                           xpt_devicefunc_t *tr_func, void *arg);
 267 static int              xptperiphtraverse(struct cam_ed *device,
 268                                           struct cam_periph *start_periph,
 269                                           xpt_periphfunc_t *tr_func, void *arg);
 270 static int              xptpdrvtraverse(struct periph_driver **start_pdrv,
 271                                         xpt_pdrvfunc_t *tr_func, void *arg);
 272 static int              xptpdperiphtraverse(struct periph_driver **pdrv,
 273                                             struct cam_periph *start_periph,
 274                                             xpt_periphfunc_t *tr_func,
 275                                             void *arg);
 276 static xpt_busfunc_t    xptdefbusfunc;
 277 static xpt_targetfunc_t xptdeftargetfunc;
 278 static xpt_devicefunc_t xptdefdevicefunc;
 279 static xpt_periphfunc_t xptdefperiphfunc;
 280 static void             xpt_finishconfig_task(void *context, int pending);
 281 static int              xpt_for_all_busses(xpt_busfunc_t *tr_func, void *arg);
 282 static int              xpt_for_all_devices(xpt_devicefunc_t *tr_func,
 283                                             void *arg);
 284 static void             xpt_dev_async_default(u_int32_t async_code,
 285                                               struct cam_eb *bus,
 286                                               struct cam_et *target,
 287                                               struct cam_ed *device,
 288                                               void *async_arg);
 289 static struct cam_ed *  xpt_alloc_device_default(struct cam_eb *bus,
 290                                                  struct cam_et *target,
 291                                                  lun_id_t lun_id);
 292 static xpt_devicefunc_t xptsetasyncfunc;
 293 static xpt_busfunc_t    xptsetasyncbusfunc;
 294 static cam_status       xptregister(struct cam_periph *periph,
 295                                     void *arg);
 296 static __inline int periph_is_queued(struct cam_periph *periph);
 297 static __inline int device_is_alloc_queued(struct cam_ed *device);
 298 static __inline int device_is_send_queued(struct cam_ed *device);
 299
 300 static __inline int
 301 xpt_schedule_dev_allocq(struct cam_eb *bus, struct cam_ed *dev)
 302 {
 303         int retval;
 304
 305         if ((dev->drvq.entries > 0) &&
 306             (dev->ccbq.devq_openings > 0) &&
 307             (cam_ccbq_frozen(&dev->ccbq, CAM_PRIORITY_TO_RL(
 308                 CAMQ_GET_PRIO(&dev->drvq))) == 0)) {
 309                 /*
 310                  * The priority of a device waiting for CCB resources
 311                  * is that of the highest priority peripheral driver
 312                  * enqueued.
 313                  */
 314                 retval = xpt_schedule_dev(&bus->sim->devq->alloc_queue,
 315                                           &dev->alloc_ccb_entry.pinfo,
 316                                           CAMQ_GET_PRIO(&dev->drvq));
 317         } else {
 318                 retval = 0;
 319         }
 320
 321         return (retval);
 322 }
 323
 324 static __inline int
 325 xpt_schedule_dev_sendq(struct cam_eb *bus, struct cam_ed *dev)
 326 {
 327         int     retval;
 328
 329         if ((dev->ccbq.queue.entries > 0) &&
 330             (dev->ccbq.dev_openings > 0) &&
 331             (cam_ccbq_frozen_top(&dev->ccbq) == 0)) {
 332                 /*
 333                  * The priority of a device waiting for controller
 334                  * resources is that of the highest priority CCB
 335                  * enqueued.
 336                  */
 337                 retval =
 338                     xpt_schedule_dev(&bus->sim->devq->send_queue,
 339                                      &dev->send_ccb_entry.pinfo,
 340                                      CAMQ_GET_PRIO(&dev->ccbq.queue));
 341         } else {
 342                 retval = 0;
 343         }
 344         return (retval);
 345 }
 346
 347 static __inline int
 348 periph_is_queued(struct cam_periph *periph)
 349 {
 350         return (periph->pinfo.index != CAM_UNQUEUED_INDEX);
 351 }
 352
 353 static __inline int
 354 device_is_alloc_queued(struct cam_ed *device)
 355 {
 356         return (device->alloc_ccb_entry.pinfo.index != CAM_UNQUEUED_INDEX);
 357 }
 358
 359 static __inline int
 360 device_is_send_queued(struct cam_ed *device)
 361 {
 362         return (device->send_ccb_entry.pinfo.index != CAM_UNQUEUED_INDEX);
 363 }
 364
 365 static void
 366 xpt_periph_init()
 367 {
 368         make_dev(&xpt_cdevsw, 0, UID_ROOT, GID_OPERATOR, 0600, "xpt0");
 369 }
 370
 371 static void
 372 xptdone(struct cam_periph *periph, union ccb *done_ccb)
 373 {
 374         /* Caller will release the CCB */
 375         wakeup(&done_ccb->ccb_h.cbfcnp);
 376 }
 377
 378 static int
 379 xptopen(struct cdev *dev, int flags, int fmt, struct thread *td)
 380 {
 381
 382         /*
 383          * Only allow read-write access.
 384          */
 385         if (((flags & FWRITE) == 0) || ((flags & FREAD) == 0))
 386                 return(EPERM);
 387
 388         /*
 389          * We don't allow nonblocking access.
 390          */
 391         if ((flags & O_NONBLOCK) != 0) {
 392                 printf("%s: can't do nonblocking access\n", devtoname(dev));
 393                 return(ENODEV);
 394         }
 395
 396         /* Mark ourselves open */
 397         mtx_lock(&xsoftc.xpt_lock);
 398         xsoftc.flags |= XPT_FLAG_OPEN;
 399         mtx_unlock(&xsoftc.xpt_lock);
 400
 401         return(0);
 402 }
 403
 404 static int
 405 xptclose(struct cdev *dev, int flag, int fmt, struct thread *td)
 406 {
 407
 408         /* Mark ourselves closed */
 409         mtx_lock(&xsoftc.xpt_lock);
 410         xsoftc.flags &= ~XPT_FLAG_OPEN;
 411         mtx_unlock(&xsoftc.xpt_lock);
 412
 413         return(0);
 414 }
 415
 416 /*
 417  * Don't automatically grab the xpt softc lock here even though this is going
 418  * through the xpt device.  The xpt device is really just a back door for
 419  * accessing other devices and SIMs, so the right thing to do is to grab
 420  * the appropriate SIM lock once the bus/SIM is located.
 421  */
 422 static int
 423 xptioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flag, struct thread *td)
 424 {
 425         int error;
 426
 427         error = 0;
 428
 429         switch(cmd) {
 430         /*
 431          * For the transport layer CAMIOCOMMAND ioctl, we really only want
 432          * to accept CCB types that don't quite make sense to send through a
 433          * passthrough driver. XPT_PATH_INQ is an exception to this, as stated
 434          * in the CAM spec.
 435          */
 436         case CAMIOCOMMAND: {
 437                 union ccb *ccb;
 438                 union ccb *inccb;
 439                 struct cam_eb *bus;
 440
 441                 inccb = (union ccb *)addr;
 442
 443                 bus = xpt_find_bus(inccb->ccb_h.path_id);
 444                 if (bus == NULL) {
 445                         error = EINVAL;
 446                         break;
 447                 }
 448
 449                 switch(inccb->ccb_h.func_code) {
 450                 case XPT_SCAN_BUS:
 451                 case XPT_RESET_BUS:
 452                         if ((inccb->ccb_h.target_id != CAM_TARGET_WILDCARD)
 453                          || (inccb->ccb_h.target_lun != CAM_LUN_WILDCARD)) {
 454                                 error = EINVAL;
 455                                 break;
 456                         }
 457                         /* FALLTHROUGH */
 458                 case XPT_PATH_INQ:
 459                 case XPT_ENG_INQ:
 460                 case XPT_SCAN_LUN:
 461
 462                         ccb = xpt_alloc_ccb();
 463
 464                         CAM_SIM_LOCK(bus->sim);
 465
 466                         /*
 467                          * Create a path using the bus, target, and lun the
 468                          * user passed in.
 469                          */
 470                         if (xpt_create_path(&ccb->ccb_h.path, xpt_periph,
 471                                             inccb->ccb_h.path_id,
 472                                             inccb->ccb_h.target_id,
 473                                             inccb->ccb_h.target_lun) !=
 474                                             CAM_REQ_CMP){
 475                                 error = EINVAL;
 476                                 CAM_SIM_UNLOCK(bus->sim);
 477                                 xpt_free_ccb(ccb);
 478                                 break;
 479                         }
 480                         /* Ensure all of our fields are correct */
 481                         xpt_setup_ccb(&ccb->ccb_h, ccb->ccb_h.path,
 482                                       inccb->ccb_h.pinfo.priority);
 483                         xpt_merge_ccb(ccb, inccb);
 484                         ccb->ccb_h.cbfcnp = xptdone;
 485                         cam_periph_runccb(ccb, NULL, 0, 0, NULL);
 486                         bcopy(ccb, inccb, sizeof(union ccb));
 487                         xpt_free_path(ccb->ccb_h.path);
 488                         xpt_free_ccb(ccb);
 489                         CAM_SIM_UNLOCK(bus->sim);
 490                         break;
 491
 492                 case XPT_DEBUG: {
 493                         union ccb ccb;
 494
 495                         /*
 496                          * This is an immediate CCB, so it's okay to
 497                          * allocate it on the stack.
 498                          */
 499
 500                         CAM_SIM_LOCK(bus->sim);
 501
 502                         /*
 503                          * Create a path using the bus, target, and lun the
 504                          * user passed in.
 505                          */
 506                         if (xpt_create_path(&ccb.ccb_h.path, xpt_periph,
 507                                             inccb->ccb_h.path_id,
 508                                             inccb->ccb_h.target_id,
 509                                             inccb->ccb_h.target_lun) !=
 510                                             CAM_REQ_CMP){
 511                                 error = EINVAL;
 512                                 CAM_SIM_UNLOCK(bus->sim);
 513                                 break;
 514                         }
 515                         /* Ensure all of our fields are correct */
 516                         xpt_setup_ccb(&ccb.ccb_h, ccb.ccb_h.path,
 517                                       inccb->ccb_h.pinfo.priority);
 518                         xpt_merge_ccb(&ccb, inccb);
 519                         ccb.ccb_h.cbfcnp = xptdone;
 520                         xpt_action(&ccb);
 521                         CAM_SIM_UNLOCK(bus->sim);
 522                         bcopy(&ccb, inccb, sizeof(union ccb));
 523                         xpt_free_path(ccb.ccb_h.path);
 524                         break;
 525
 526                 }
 527                 case XPT_DEV_MATCH: {
 528                         struct cam_periph_map_info mapinfo;
 529                         struct cam_path *old_path;
 530
 531                         /*
 532                          * We can't deal with physical addresses for this
 533                          * type of transaction.
 534                          */
 535                         if (inccb->ccb_h.flags & CAM_DATA_PHYS) {
 536                                 error = EINVAL;
 537                                 break;
 538                         }
 539
 540                         /*
 541                          * Save this in case the caller had it set to
 542                          * something in particular.
 543                          */
 544                         old_path = inccb->ccb_h.path;
 545
 546                         /*
 547                          * We really don't need a path for the matching
 548                          * code.  The path is needed because of the
 549                          * debugging statements in xpt_action().  They
 550                          * assume that the CCB has a valid path.
 551                          */
 552                         inccb->ccb_h.path = xpt_periph->path;
 553
 554                         bzero(&mapinfo, sizeof(mapinfo));
 555
 556                         /*
 557                          * Map the pattern and match buffers into kernel
 558                          * virtual address space.
 559                          */
 560                         error = cam_periph_mapmem(inccb, &mapinfo);
 561
 562                         if (error) {
 563                                 inccb->ccb_h.path = old_path;
 564                                 break;
 565                         }
 566
 567                         /*
 568                          * This is an immediate CCB, we can send it on directly.
 569                          */
 570                         xpt_action(inccb);
 571
 572                         /*
 573                          * Map the buffers back into user space.
 574                          */
 575                         cam_periph_unmapmem(inccb, &mapinfo);
 576
 577                         inccb->ccb_h.path = old_path;
 578
 579                         error = 0;
 580                         break;
 581                 }
 582                 default:
 583                         error = ENOTSUP;
 584                         break;
 585                 }
 586                 xpt_release_bus(bus);
 587                 break;
 588         }
 589         /*
 590          * This is the getpassthru ioctl. It takes a XPT_GDEVLIST ccb as input,
 591          * with the periphal driver name and unit name filled in.  The other
 592          * fields don't really matter as input.  The passthrough driver name
 593          * ("pass"), and unit number are passed back in the ccb.  The current
 594          * device generation number, and the index into the device peripheral
 595          * driver list, and the status are also passed back.  Note that
 596          * since we do everything in one pass, unlike the XPT_GDEVLIST ccb,
 597          * we never return a status of CAM_GDEVLIST_LIST_CHANGED.  It is
 598          * (or rather should be) impossible for the device peripheral driver
 599          * list to change since we look at the whole thing in one pass, and
 600          * we do it with lock protection.
 601          *
 602          */
 603         case CAMGETPASSTHRU: {
 604                 union ccb *ccb;
 605                 struct cam_periph *periph;
 606                 struct periph_driver **p_drv;
 607                 char   *name;
 608                 u_int unit;
 609                 u_int cur_generation;
 610                 int base_periph_found;
 611                 int splbreaknum;
 612
 613                 ccb = (union ccb *)addr;
 614                 unit = ccb->cgdl.unit_number;
 615                 name = ccb->cgdl.periph_name;
 616                 /*
 617                  * Every 100 devices, we want to drop our lock protection to
 618                  * give the software interrupt handler a chance to run.
 619                  * Most systems won't run into this check, but this should
 620                  * avoid starvation in the software interrupt handler in
 621                  * large systems.
 622                  */
 623                 splbreaknum = 100;
 624
 625                 ccb = (union ccb *)addr;
 626
 627                 base_periph_found = 0;
 628
 629                 /*
 630                  * Sanity check -- make sure we don't get a null peripheral
 631                  * driver name.
 632                  */
 633                 if (*ccb->cgdl.periph_name == '\0') {
 634                         error = EINVAL;
 635                         break;
 636                 }
 637
 638                 /* Keep the list from changing while we traverse it */
 639                 mtx_lock(&xsoftc.xpt_topo_lock);
 640 ptstartover:
 641                 cur_generation = xsoftc.xpt_generation;
 642
 643                 /* first find our driver in the list of drivers */
 644                 for (p_drv = periph_drivers; *p_drv != NULL; p_drv++)
 645                         if (strcmp((*p_drv)->driver_name, name) == 0)
 646                                 break;
 647
 648                 if (*p_drv == NULL) {
 649                         mtx_unlock(&xsoftc.xpt_topo_lock);
 650                         ccb->ccb_h.status = CAM_REQ_CMP_ERR;
 651                         ccb->cgdl.status = CAM_GDEVLIST_ERROR;
 652                         *ccb->cgdl.periph_name = '\0';
 653                         ccb->cgdl.unit_number = 0;
 654                         error = ENOENT;
 655                         break;
 656                 }
 657
 658                 /*
 659                  * Run through every peripheral instance of this driver
 660                  * and check to see whether it matches the unit passed
 661                  * in by the user.  If it does, get out of the loops and
 662                  * find the passthrough driver associated with that
 663                  * peripheral driver.
 664                  */
 665                 for (periph = TAILQ_FIRST(&(*p_drv)->units); periph != NULL;
 666                      periph = TAILQ_NEXT(periph, unit_links)) {
 667
 668                         if (periph->unit_number == unit) {
 669                                 break;
 670                         } else if (--splbreaknum == 0) {
 671                                 mtx_unlock(&xsoftc.xpt_topo_lock);
 672                                 mtx_lock(&xsoftc.xpt_topo_lock);
 673                                 splbreaknum = 100;
 674                                 if (cur_generation != xsoftc.xpt_generation)
 675                                        goto ptstartover;
 676                         }
 677                 }
 678                 /*
 679                  * If we found the peripheral driver that the user passed
 680                  * in, go through all of the peripheral drivers for that
 681                  * particular device and look for a passthrough driver.
 682                  */
 683                 if (periph != NULL) {
 684                         struct cam_ed *device;
 685                         int i;
 686
 687                         base_periph_found = 1;
 688                         device = periph->path->device;
 689                         for (i = 0, periph = SLIST_FIRST(&device->periphs);
 690                              periph != NULL;
 691                              periph = SLIST_NEXT(periph, periph_links), i++) {
 692                                 /*
 693                                  * Check to see whether we have a
 694                                  * passthrough device or not.
 695                                  */
 696                                 if (strcmp(periph->periph_name, "pass") == 0) {
 697                                         /*
 698                                          * Fill in the getdevlist fields.
 699                                          */
 700                                         strcpy(ccb->cgdl.periph_name,
 701                                                periph->periph_name);
 702                                         ccb->cgdl.unit_number =
 703                                                 periph->unit_number;
 704                                         if (SLIST_NEXT(periph, periph_links))
 705                                                 ccb->cgdl.status =
 706                                                         CAM_GDEVLIST_MORE_DEVS;
 707                                         else
 708                                                 ccb->cgdl.status =
 709                                                        CAM_GDEVLIST_LAST_DEVICE;
 710                                         ccb->cgdl.generation =
 711                                                 device->generation;
 712                                         ccb->cgdl.index = i;
 713                                         /*
 714                                          * Fill in some CCB header fields
 715                                          * that the user may want.
 716                                          */
 717                                         ccb->ccb_h.path_id =
 718                                                 periph->path->bus->path_id;
 719                                         ccb->ccb_h.target_id =
 720                                                 periph->path->target->target_id;
 721                                         ccb->ccb_h.target_lun =
 722                                                 periph->path->device->lun_id;
 723                                         ccb->ccb_h.status = CAM_REQ_CMP;
 724                                         break;
 725                                 }
 726                         }
 727                 }
 728
 729                 /*
 730                  * If the periph is null here, one of two things has
 731                  * happened.  The first possibility is that we couldn't
 732                  * find the unit number of the particular peripheral driver
 733                  * that the user is asking about.  e.g. the user asks for
 734                  * the passthrough driver for "da11".  We find the list of
 735                  * "da" peripherals all right, but there is no unit 11.
 736                  * The other possibility is that we went through the list
 737                  * of peripheral drivers attached to the device structure,
 738                  * but didn't find one with the name "pass".  Either way,
 739                  * we return ENOENT, since we couldn't find something.
 740                  */
 741                 if (periph == NULL) {
 742                         ccb->ccb_h.status = CAM_REQ_CMP_ERR;
 743                         ccb->cgdl.status = CAM_GDEVLIST_ERROR;
 744                         *ccb->cgdl.periph_name = '\0';
 745                         ccb->cgdl.unit_number = 0;
 746                         error = ENOENT;
 747                         /*
 748                          * It is unfortunate that this is even necessary,
 749                          * but there are many, many clueless users out there.
 750                          * If this is true, the user is looking for the
 751                          * passthrough driver, but doesn't have one in his
 752                          * kernel.
 753                          */
 754                         if (base_periph_found == 1) {
 755                                 printf("xptioctl: pass driver is not in the "
 756                                        "kernel\n");
 757                                 printf("xptioctl: put \"device pass\" in "
 758                                        "your kernel config file\n");
 759                         }
 760                 }
 761                 mtx_unlock(&xsoftc.xpt_topo_lock);
 762                 break;
 763                 }
 764         default:
 765                 error = ENOTTY;
 766                 break;
 767         }
 768
 769         return(error);
 770 }
 771
 772 static int
 773 cam_module_event_handler(module_t mod, int what, void *arg)
 774 {
 775         int error;
 776
 777         switch (what) {
 778         case MOD_LOAD:
 779                 if ((error = xpt_init(NULL)) != 0)
 780                         return (error);
 781                 break;
 782         case MOD_UNLOAD:
 783                 return EBUSY;
 784         default:
 785                 return EOPNOTSUPP;
 786         }
 787
 788         return 0;
 789 }
 790
 791 static void
 792 xpt_rescan_done(struct cam_periph *periph, union ccb *done_ccb)
 793 {
 794
 795         if (done_ccb->ccb_h.ppriv_ptr1 == NULL) {
 796                 xpt_free_path(done_ccb->ccb_h.path);
 797                 xpt_free_ccb(done_ccb);
 798         } else {
 799                 done_ccb->ccb_h.cbfcnp = done_ccb->ccb_h.ppriv_ptr1;
 800                 (*done_ccb->ccb_h.cbfcnp)(periph, done_ccb);
 801         }
 802         xpt_release_boot();
 803 }
 804
 805 /* thread to handle bus rescans */
 806 static void
 807 xpt_scanner_thread(void *dummy)
 808 {
 809         union ccb       *ccb;
 810         struct cam_sim  *sim;
 811
 812         xpt_lock_buses();
 813         for (;;) {
 814                 if (TAILQ_EMPTY(&xsoftc.ccb_scanq))
 815                         msleep(&xsoftc.ccb_scanq, &xsoftc.xpt_topo_lock, PRIBIO,
 816                                "ccb_scanq", 0);
 817                 if ((ccb = (union ccb *)TAILQ_FIRST(&xsoftc.ccb_scanq)) != NULL) {
 818                         TAILQ_REMOVE(&xsoftc.ccb_scanq, &ccb->ccb_h, sim_links.tqe);
 819                         xpt_unlock_buses();
 820
 821                         sim = ccb->ccb_h.path->bus->sim;
 822                         CAM_SIM_LOCK(sim);
 823                         xpt_action(ccb);
 824                         CAM_SIM_UNLOCK(sim);
 825
 826                         xpt_lock_buses();
 827                 }
 828         }
 829 }
 830
 831 void
 832 xpt_rescan(union ccb *ccb)
 833 {
 834         struct ccb_hdr *hdr;
 835
 836         /* Prepare request */
 837         if (ccb->ccb_h.path->target->target_id == CAM_TARGET_WILDCARD ||
 838             ccb->ccb_h.path->device->lun_id == CAM_LUN_WILDCARD)
 839                 ccb->ccb_h.func_code = XPT_SCAN_BUS;
 840         else
 841                 ccb->ccb_h.func_code = XPT_SCAN_LUN;
 842         ccb->ccb_h.ppriv_ptr1 = ccb->ccb_h.cbfcnp;
 843         ccb->ccb_h.cbfcnp = xpt_rescan_done;
 844         xpt_setup_ccb(&ccb->ccb_h, ccb->ccb_h.path, CAM_PRIORITY_XPT);
 845         /* Don't make duplicate entries for the same paths. */
 846         xpt_lock_buses();
 847         if (ccb->ccb_h.ppriv_ptr1 == NULL) {
 848                 TAILQ_FOREACH(hdr, &xsoftc.ccb_scanq, sim_links.tqe) {
 849                         if (xpt_path_comp(hdr->path, ccb->ccb_h.path) == 0) {
 850                                 wakeup(&xsoftc.ccb_scanq);
 851                                 xpt_unlock_buses();
 852                                 xpt_print(ccb->ccb_h.path, "rescan already queued\n");
 853                                 xpt_free_path(ccb->ccb_h.path);
 854                                 xpt_free_ccb(ccb);
 855                                 return;
 856                         }
 857                 }
 858         }
 859         TAILQ_INSERT_TAIL(&xsoftc.ccb_scanq, &ccb->ccb_h, sim_links.tqe);
 860         xsoftc.buses_to_config++;
 861         wakeup(&xsoftc.ccb_scanq);
 862         xpt_unlock_buses();
 863 }
 864
 865 /* Functions accessed by the peripheral drivers */
 866 static int
 867 xpt_init(void *dummy)
 868 {
 869         struct cam_sim *xpt_sim;
 870         struct cam_path *path;
 871         struct cam_devq *devq;
 872         cam_status status;
 873
 874         TAILQ_INIT(&xsoftc.xpt_busses);
 875         TAILQ_INIT(&cam_simq);
 876         TAILQ_INIT(&xsoftc.ccb_scanq);
 877         STAILQ_INIT(&xsoftc.highpowerq);
 878         xsoftc.num_highpower = CAM_MAX_HIGHPOWER;
 879
 880         mtx_init(&cam_simq_lock, "CAM SIMQ lock", NULL, MTX_DEF);
 881         mtx_init(&xsoftc.xpt_lock, "XPT lock", NULL, MTX_DEF);
 882         mtx_init(&xsoftc.xpt_topo_lock, "XPT topology lock", NULL, MTX_DEF);
 883
 884         /*
 885          * The xpt layer is, itself, the equivelent of a SIM.
 886          * Allow 16 ccbs in the ccb pool for it.  This should
 887          * give decent parallelism when we probe busses and
 888          * perform other XPT functions.
 889          */
 890         devq = cam_simq_alloc(16);
 891         xpt_sim = cam_sim_alloc(xptaction,
 892                                 xptpoll,
 893                                 "xpt",
 894                                 /*softc*/NULL,
 895                                 /*unit*/0,
 896                                 /*mtx*/&xsoftc.xpt_lock,
 897                                 /*max_dev_transactions*/0,
 898                                 /*max_tagged_dev_transactions*/0,
 899                                 devq);
 900         if (xpt_sim == NULL)
 901                 return (ENOMEM);
 902
 903         mtx_lock(&xsoftc.xpt_lock);
 904         if ((status = xpt_bus_register(xpt_sim, NULL, 0)) != CAM_SUCCESS) {
 905                 mtx_unlock(&xsoftc.xpt_lock);
 906                 printf("xpt_init: xpt_bus_register failed with status %#x,"
 907                        " failing attach\n", status);
 908                 return (EINVAL);
 909         }
 910
 911         /*
 912          * Looking at the XPT from the SIM layer, the XPT is
 913          * the equivelent of a peripheral driver.  Allocate
 914          * a peripheral driver entry for us.
 915          */
 916         if ((status = xpt_create_path(&path, NULL, CAM_XPT_PATH_ID,
 917                                       CAM_TARGET_WILDCARD,
 918                                       CAM_LUN_WILDCARD)) != CAM_REQ_CMP) {
 919                 mtx_unlock(&xsoftc.xpt_lock);
 920                 printf("xpt_init: xpt_create_path failed with status %#x,"
 921                        " failing attach\n", status);
 922                 return (EINVAL);
 923         }
 924
 925         cam_periph_alloc(xptregister, NULL, NULL, NULL, "xpt", CAM_PERIPH_BIO,
 926                          path, NULL, 0, xpt_sim);
 927         xpt_free_path(path);
 928         mtx_unlock(&xsoftc.xpt_lock);
 929         /* Install our software interrupt handlers */
 930         swi_add(NULL, "cambio", camisr, NULL, SWI_CAMBIO, INTR_MPSAFE, &cambio_ih);
 931         /*
 932          * Register a callback for when interrupts are enabled.
 933          */
 934         xsoftc.xpt_config_hook =
 935             (struct intr_config_hook *)malloc(sizeof(struct intr_config_hook),
 936                                               M_CAMXPT, M_NOWAIT | M_ZERO);
 937         if (xsoftc.xpt_config_hook == NULL) {
 938                 printf("xpt_init: Cannot malloc config hook "
 939                        "- failing attach\n");
 940                 return (ENOMEM);
 941         }
 942         xsoftc.xpt_config_hook->ich_func = xpt_config;
 943         if (config_intrhook_establish(xsoftc.xpt_config_hook) != 0) {
 944                 free (xsoftc.xpt_config_hook, M_CAMXPT);
 945                 printf("xpt_init: config_intrhook_establish failed "
 946                        "- failing attach\n");
 947         }
 948
 949         return (0);
 950 }
 951
 952 static cam_status
 953 xptregister(struct cam_periph *periph, void *arg)
 954 {
 955         struct cam_sim *xpt_sim;
 956
 957         if (periph == NULL) {
 958                 printf("xptregister: periph was NULL!!\n");
 959                 return(CAM_REQ_CMP_ERR);
 960         }
 961
 962         xpt_sim = (struct cam_sim *)arg;
 963         xpt_sim->softc = periph;
 964         xpt_periph = periph;
 965         periph->softc = NULL;
 966
 967         return(CAM_REQ_CMP);
 968 }
 969
 970 int32_t
 971 xpt_add_periph(struct cam_periph *periph)
 972 {
 973         struct cam_ed *device;
 974         int32_t  status;
 975         struct periph_list *periph_head;
 976
 977         mtx_assert(periph->sim->mtx, MA_OWNED);
 978
 979         device = periph->path->device;
 980
 981         periph_head = &device->periphs;
 982
 983         status = CAM_REQ_CMP;
 984
 985         if (device != NULL) {
 986                 /*
 987                  * Make room for this peripheral
 988                  * so it will fit in the queue
 989                  * when it's scheduled to run
 990                  */
 991                 status = camq_resize(&device->drvq,
 992                                      device->drvq.array_size + 1);
 993
 994                 device->generation++;
 995
 996                 SLIST_INSERT_HEAD(periph_head, periph, periph_links);
 997         }
 998
 999         mtx_lock(&xsoftc.xpt_topo_lock);
1000         xsoftc.xpt_generation++;
1001         mtx_unlock(&xsoftc.xpt_topo_lock);
1002
1003         return (status);
1004 }
1005
1006 void
1007 xpt_remove_periph(struct cam_periph *periph)
1008 {
1009         struct cam_ed *device;
1010
1011         mtx_assert(periph->sim->mtx, MA_OWNED);
1012
1013         device = periph->path->device;
1014
1015         if (device != NULL) {
1016                 struct periph_list *periph_head;
1017
1018                 periph_head = &device->periphs;
1019
1020                 /* Release the slot for this peripheral */
1021                 camq_resize(&device->drvq, device->drvq.array_size - 1);
1022
1023                 device->generation++;
1024
1025                 SLIST_REMOVE(periph_head, periph, cam_periph, periph_links);
1026         }
1027
1028         mtx_lock(&xsoftc.xpt_topo_lock);
1029         xsoftc.xpt_generation++;
1030         mtx_unlock(&xsoftc.xpt_topo_lock);
1031 }
1032
1033
1034 void
1035 xpt_announce_periph(struct cam_periph *periph, char *announce_string)
1036 {
1037         struct  cam_path *path = periph->path;
1038
1039         mtx_assert(periph->sim->mtx, MA_OWNED);
1040
1041         printf("%s%d at %s%d bus %d scbus%d target %d lun %d\n",
1042                periph->periph_name, periph->unit_number,
1043                path->bus->sim->sim_name,
1044                path->bus->sim->unit_number,
1045                path->bus->sim->bus_id,
1046                path->bus->path_id,
1047                path->target->target_id,
1048                path->device->lun_id);
1049         printf("%s%d: ", periph->periph_name, periph->unit_number);
1050         if (path->device->protocol == PROTO_SCSI)
1051                 scsi_print_inquiry(&path->device->inq_data);
1052         else if (path->device->protocol == PROTO_ATA ||
1053             path->device->protocol == PROTO_SATAPM)
1054                 ata_print_ident(&path->device->ident_data);
1055         else
1056                 printf("Unknown protocol device\n");
1057         if (bootverbose && path->device->serial_num_len > 0) {
1058                 /* Don't wrap the screen  - print only the first 60 chars */
1059                 printf("%s%d: Serial Number %.60s\n", periph->periph_name,
1060                        periph->unit_number, path->device->serial_num);
1061         }
1062         /* Announce transport details. */
1063         (*(path->bus->xport->announce))(periph);
1064         /* Announce command queueing. */
1065         if (path->device->inq_flags & SID_CmdQue
1066          || path->device->flags & CAM_DEV_TAG_AFTER_COUNT) {
1067                 printf("%s%d: Command Queueing enabled\n",
1068                        periph->periph_name, periph->unit_number);
1069         }
1070         /* Announce caller's details if they've passed in. */
1071         if (announce_string != NULL)
1072                 printf("%s%d: %s\n", periph->periph_name,
1073                        periph->unit_number, announce_string);
1074 }
1075
1076 static dev_match_ret
1077 xptbusmatch(struct dev_match_pattern *patterns, u_int num_patterns,
1078             struct cam_eb *bus)
1079 {
1080         dev_match_ret retval;
1081         int i;
1082
1083         retval = DM_RET_NONE;
1084
1085         /*
1086          * If we aren't given something to match against, that's an error.
1087          */
1088         if (bus == NULL)
1089                 return(DM_RET_ERROR);
1090
1091         /*
1092          * If there are no match entries, then this bus matches no
1093          * matter what.
1094          */
1095         if ((patterns == NULL) || (num_patterns == 0))
1096                 return(DM_RET_DESCEND | DM_RET_COPY);
1097
1098         for (i = 0; i < num_patterns; i++) {
1099                 struct bus_match_pattern *cur_pattern;
1100
1101                 /*
1102                  * If the pattern in question isn't for a bus node, we
1103                  * aren't interested.  However, we do indicate to the
1104                  * calling routine that we should continue descending the
1105                  * tree, since the user wants to match against lower-level
1106                  * EDT elements.
1107                  */
1108                 if (patterns[i].type != DEV_MATCH_BUS) {
1109                         if ((retval & DM_RET_ACTION_MASK) == DM_RET_NONE)
1110                                 retval |= DM_RET_DESCEND;
1111                         continue;
1112                 }
1113
1114                 cur_pattern = &patterns[i].pattern.bus_pattern;
1115
1116                 /*
1117                  * If they want to match any bus node, we give them any
1118                  * device node.
1119                  */
1120                 if (cur_pattern->flags == BUS_MATCH_ANY) {
1121                         /* set the copy flag */
1122                         retval |= DM_RET_COPY;
1123
1124                         /*
1125                          * If we've already decided on an action, go ahead
1126                          * and return.
1127                          */
1128                         if ((retval & DM_RET_ACTION_MASK) != DM_RET_NONE)
1129                                 return(retval);
1130                 }
1131
1132                 /*
1133                  * Not sure why someone would do this...
1134                  */
1135                 if (cur_pattern->flags == BUS_MATCH_NONE)
1136                         continue;
1137
1138                 if (((cur_pattern->flags & BUS_MATCH_PATH) != 0)
1139                  && (cur_pattern->path_id != bus->path_id))
1140                         continue;
1141
1142                 if (((cur_pattern->flags & BUS_MATCH_BUS_ID) != 0)
1143                  && (cur_pattern->bus_id != bus->sim->bus_id))
1144                         continue;
1145
1146                 if (((cur_pattern->flags & BUS_MATCH_UNIT) != 0)
1147                  && (cur_pattern->unit_number != bus->sim->unit_number))
1148                         continue;
1149
1150                 if (((cur_pattern->flags & BUS_MATCH_NAME) != 0)
1151                  && (strncmp(cur_pattern->dev_name, bus->sim->sim_name,
1152                              DEV_IDLEN) != 0))
1153                         continue;
1154
1155                 /*
1156                  * If we get to this point, the user definitely wants
1157                  * information on this bus.  So tell the caller to copy the
1158                  * data out.
1159                  */
1160                 retval |= DM_RET_COPY;
1161
1162                 /*
1163                  * If the return action has been set to descend, then we
1164                  * know that we've already seen a non-bus matching
1165                  * expression, therefore we need to further descend the tree.
1166                  * This won't change by continuing around the loop, so we
1167                  * go ahead and return.  If we haven't seen a non-bus
1168                  * matching expression, we keep going around the loop until
1169                  * we exhaust the matching expressions.  We'll set the stop
1170                  * flag once we fall out of the loop.
1171                  */
1172                 if ((retval & DM_RET_ACTION_MASK) == DM_RET_DESCEND)
1173                         return(retval);
1174         }
1175
1176         /*
1177          * If the return action hasn't been set to descend yet, that means
1178          * we haven't seen anything other than bus matching patterns.  So
1179          * tell the caller to stop descending the tree -- the user doesn't
1180          * want to match against lower level tree elements.
1181          */
1182         if ((retval & DM_RET_ACTION_MASK) == DM_RET_NONE)
1183                 retval |= DM_RET_STOP;
1184
1185         return(retval);
1186 }
1187
1188 static dev_match_ret
1189 xptdevicematch(struct dev_match_pattern *patterns, u_int num_patterns,
1190                struct cam_ed *device)
1191 {
1192         dev_match_ret retval;
1193         int i;
1194
1195         retval = DM_RET_NONE;
1196
1197         /*
1198          * If we aren't given something to match against, that's an error.
1199          */
1200         if (device == NULL)
1201                 return(DM_RET_ERROR);
1202
1203         /*
1204          * If there are no match entries, then this device matches no
1205          * matter what.
1206          */
1207         if ((patterns == NULL) || (num_patterns == 0))
1208                 return(DM_RET_DESCEND | DM_RET_COPY);
1209
1210         for (i = 0; i < num_patterns; i++) {
1211                 struct device_match_pattern *cur_pattern;
1212
1213                 /*
1214                  * If the pattern in question isn't for a device node, we
1215                  * aren't interested.
1216                  */
1217                 if (patterns[i].type != DEV_MATCH_DEVICE) {
1218                         if ((patterns[i].type == DEV_MATCH_PERIPH)
1219                          && ((retval & DM_RET_ACTION_MASK) == DM_RET_NONE))
1220                                 retval |= DM_RET_DESCEND;
1221                         continue;
1222                 }
1223
1224                 cur_pattern = &patterns[i].pattern.device_pattern;
1225
1226                 /*
1227                  * If they want to match any device node, we give them any
1228                  * device node.
1229                  */
1230                 if (cur_pattern->flags == DEV_MATCH_ANY) {
1231                         /* set the copy flag */
1232                         retval |= DM_RET_COPY;
1233
1234
1235                         /*
1236                          * If we've already decided on an action, go ahead
1237                          * and return.
1238                          */
1239                         if ((retval & DM_RET_ACTION_MASK) != DM_RET_NONE)
1240                                 return(retval);
1241                 }
1242
1243                 /*
1244                  * Not sure why someone would do this...
1245                  */
1246                 if (cur_pattern->flags == DEV_MATCH_NONE)
1247                         continue;
1248
1249                 if (((cur_pattern->flags & DEV_MATCH_PATH) != 0)
1250                  && (cur_pattern->path_id != device->target->bus->path_id))
1251                         continue;
1252
1253                 if (((cur_pattern->flags & DEV_MATCH_TARGET) != 0)
1254                  && (cur_pattern->target_id != device->target->target_id))
1255                         continue;
1256
1257                 if (((cur_pattern->flags & DEV_MATCH_LUN) != 0)
1258                  && (cur_pattern->target_lun != device->lun_id))
1259                         continue;
1260
1261                 if (((cur_pattern->flags & DEV_MATCH_INQUIRY) != 0)
1262                  && (cam_quirkmatch((caddr_t)&device->inq_data,
1263                                     (caddr_t)&cur_pattern->inq_pat,
1264                                     1, sizeof(cur_pattern->inq_pat),
1265                                     scsi_static_inquiry_match) == NULL))
1266                         continue;
1267
1268                 /*
1269                  * If we get to this point, the user definitely wants
1270                  * information on this device.  So tell the caller to copy
1271                  * the data out.
1272                  */
1273                 retval |= DM_RET_COPY;
1274
1275                 /*
1276                  * If the return action has been set to descend, then we
1277                  * know that we've already seen a peripheral matching
1278                  * expression, therefore we need to further descend the tree.
1279                  * This won't change by continuing around the loop, so we
1280                  * go ahead and return.  If we haven't seen a peripheral
1281                  * matching expression, we keep going around the loop until
1282                  * we exhaust the matching expressions.  We'll set the stop
1283                  * flag once we fall out of the loop.
1284                  */
1285                 if ((retval & DM_RET_ACTION_MASK) == DM_RET_DESCEND)
1286                         return(retval);
1287         }
1288
1289         /*
1290          * If the return action hasn't been set to descend yet, that means
1291          * we haven't seen any peripheral matching patterns.  So tell the
1292          * caller to stop descending the tree -- the user doesn't want to
1293          * match against lower level tree elements.
1294          */
1295         if ((retval & DM_RET_ACTION_MASK) == DM_RET_NONE)
1296                 retval |= DM_RET_STOP;
1297
1298         return(retval);
1299 }
1300
1301 /*
1302  * Match a single peripheral against any number of match patterns.
1303  */
1304 static dev_match_ret
1305 xptperiphmatch(struct dev_match_pattern *patterns, u_int num_patterns,
1306                struct cam_periph *periph)
1307 {
1308         dev_match_ret retval;
1309         int i;
1310
1311         /*
1312          * If we aren't given something to match against, that's an error.
1313          */
1314         if (periph == NULL)
1315                 return(DM_RET_ERROR);
1316
1317         /*
1318          * If there are no match entries, then this peripheral matches no
1319          * matter what.
1320          */
1321         if ((patterns == NULL) || (num_patterns == 0))
1322                 return(DM_RET_STOP | DM_RET_COPY);
1323
1324         /*
1325          * There aren't any nodes below a peripheral node, so there's no
1326          * reason to descend the tree any further.
1327          */
1328         retval = DM_RET_STOP;
1329
1330         for (i = 0; i < num_patterns; i++) {
1331                 struct periph_match_pattern *cur_pattern;
1332
1333                 /*
1334                  * If the pattern in question isn't for a peripheral, we
1335                  * aren't interested.
1336                  */
1337                 if (patterns[i].type != DEV_MATCH_PERIPH)
1338                         continue;
1339
1340                 cur_pattern = &patterns[i].pattern.periph_pattern;
1341
1342                 /*
1343                  * If they want to match on anything, then we will do so.
1344                  */
1345                 if (cur_pattern->flags == PERIPH_MATCH_ANY) {
1346                         /* set the copy flag */
1347                         retval |= DM_RET_COPY;
1348
1349                         /*
1350                          * We've already set the return action to stop,
1351                          * since there are no nodes below peripherals in
1352                          * the tree.
1353                          */
1354                         return(retval);
1355                 }
1356
1357                 /*
1358                  * Not sure why someone would do this...
1359                  */
1360                 if (cur_pattern->flags == PERIPH_MATCH_NONE)
1361                         continue;
1362
1363                 if (((cur_pattern->flags & PERIPH_MATCH_PATH) != 0)
1364                  && (cur_pattern->path_id != periph->path->bus->path_id))
1365                         continue;
1366
1367                 /*
1368                  * For the target and lun id's, we have to make sure the
1369                  * target and lun pointers aren't NULL.  The xpt peripheral
1370                  * has a wildcard target and device.
1371                  */
1372                 if (((cur_pattern->flags & PERIPH_MATCH_TARGET) != 0)
1373                  && ((periph->path->target == NULL)
1374                  ||(cur_pattern->target_id != periph->path->target->target_id)))
1375                         continue;
1376
1377                 if (((cur_pattern->flags & PERIPH_MATCH_LUN) != 0)
1378                  && ((periph->path->device == NULL)
1379                  || (cur_pattern->target_lun != periph->path->device->lun_id)))
1380                         continue;
1381
1382                 if (((cur_pattern->flags & PERIPH_MATCH_UNIT) != 0)
1383                  && (cur_pattern->unit_number != periph->unit_number))
1384                         continue;
1385
1386                 if (((cur_pattern->flags & PERIPH_MATCH_NAME) != 0)
1387                  && (strncmp(cur_pattern->periph_name, periph->periph_name,
1388                              DEV_IDLEN) != 0))
1389                         continue;
1390
1391                 /*
1392                  * If we get to this point, the user definitely wants
1393                  * information on this peripheral.  So tell the caller to
1394                  * copy the data out.
1395                  */
1396                 retval |= DM_RET_COPY;
1397
1398                 /*
1399                  * The return action has already been set to stop, since
1400                  * peripherals don't have any nodes below them in the EDT.
1401                  */
1402                 return(retval);
1403         }
1404
1405         /*
1406          * If we get to this point, the peripheral that was passed in
1407          * doesn't match any of the patterns.
1408          */
1409         return(retval);
1410 }
1411
1412 static int
1413 xptedtbusfunc(struct cam_eb *bus, void *arg)
1414 {
1415         struct ccb_dev_match *cdm;
1416         dev_match_ret retval;
1417
1418         cdm = (struct ccb_dev_match *)arg;
1419
1420         /*
1421          * If our position is for something deeper in the tree, that means
1422          * that we've already seen this node.  So, we keep going down.
1423          */
1424         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
1425          && (cdm->pos.cookie.bus == bus)
1426          && (cdm->pos.position_type & CAM_DEV_POS_TARGET)
1427          && (cdm->pos.cookie.target != NULL))
1428                 retval = DM_RET_DESCEND;
1429         else
1430                 retval = xptbusmatch(cdm->patterns, cdm->num_patterns, bus);
1431
1432         /*
1433          * If we got an error, bail out of the search.
1434          */
1435         if ((retval & DM_RET_ACTION_MASK) == DM_RET_ERROR) {
1436                 cdm->status = CAM_DEV_MATCH_ERROR;
1437                 return(0);
1438         }
1439
1440         /*
1441          * If the copy flag is set, copy this bus out.
1442          */
1443         if (retval & DM_RET_COPY) {
1444                 int spaceleft, j;
1445
1446                 spaceleft = cdm->match_buf_len - (cdm->num_matches *
1447                         sizeof(struct dev_match_result));
1448
1449                 /*
1450                  * If we don't have enough space to put in another
1451                  * match result, save our position and tell the
1452                  * user there are more devices to check.
1453                  */
1454                 if (spaceleft < sizeof(struct dev_match_result)) {
1455                         bzero(&cdm->pos, sizeof(cdm->pos));
1456                         cdm->pos.position_type =
1457                                 CAM_DEV_POS_EDT | CAM_DEV_POS_BUS;
1458
1459                         cdm->pos.cookie.bus = bus;
1460                         cdm->pos.generations[CAM_BUS_GENERATION]=
1461                                 xsoftc.bus_generation;
1462                         cdm->status = CAM_DEV_MATCH_MORE;
1463                         return(0);
1464                 }
1465                 j = cdm->num_matches;
1466                 cdm->num_matches++;
1467                 cdm->matches[j].type = DEV_MATCH_BUS;
1468                 cdm->matches[j].result.bus_result.path_id = bus->path_id;
1469                 cdm->matches[j].result.bus_result.bus_id = bus->sim->bus_id;
1470                 cdm->matches[j].result.bus_result.unit_number =
1471                         bus->sim->unit_number;
1472                 strncpy(cdm->matches[j].result.bus_result.dev_name,
1473                         bus->sim->sim_name, DEV_IDLEN);
1474         }
1475
1476         /*
1477          * If the user is only interested in busses, there's no
1478          * reason to descend to the next level in the tree.
1479          */
1480         if ((retval & DM_RET_ACTION_MASK) == DM_RET_STOP)
1481                 return(1);
1482
1483         /*
1484          * If there is a target generation recorded, check it to
1485          * make sure the target list hasn't changed.
1486          */
1487         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
1488          && (bus == cdm->pos.cookie.bus)
1489          && (cdm->pos.position_type & CAM_DEV_POS_TARGET)
1490          && (cdm->pos.generations[CAM_TARGET_GENERATION] != 0)
1491          && (cdm->pos.generations[CAM_TARGET_GENERATION] !=
1492              bus->generation)) {
1493                 cdm->status = CAM_DEV_MATCH_LIST_CHANGED;
1494                 return(0);
1495         }
1496
1497         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
1498          && (cdm->pos.cookie.bus == bus)
1499          && (cdm->pos.position_type & CAM_DEV_POS_TARGET)
1500          && (cdm->pos.cookie.target != NULL))
1501                 return(xpttargettraverse(bus,
1502                                         (struct cam_et *)cdm->pos.cookie.target,
1503                                          xptedttargetfunc, arg));
1504         else
1505                 return(xpttargettraverse(bus, NULL, xptedttargetfunc, arg));
1506 }
1507
1508 static int
1509 xptedttargetfunc(struct cam_et *target, void *arg)
1510 {
1511         struct ccb_dev_match *cdm;
1512
1513         cdm = (struct ccb_dev_match *)arg;
1514
1515         /*
1516          * If there is a device list generation recorded, check it to
1517          * make sure the device list hasn't changed.
1518          */
1519         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
1520          && (cdm->pos.cookie.bus == target->bus)
1521          && (cdm->pos.position_type & CAM_DEV_POS_TARGET)
1522          && (cdm->pos.cookie.target == target)
1523          && (cdm->pos.position_type & CAM_DEV_POS_DEVICE)
1524          && (cdm->pos.generations[CAM_DEV_GENERATION] != 0)
1525          && (cdm->pos.generations[CAM_DEV_GENERATION] !=
1526              target->generation)) {
1527                 cdm->status = CAM_DEV_MATCH_LIST_CHANGED;
1528                 return(0);
1529         }
1530
1531         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
1532          && (cdm->pos.cookie.bus == target->bus)
1533          && (cdm->pos.position_type & CAM_DEV_POS_TARGET)
1534          && (cdm->pos.cookie.target == target)
1535          && (cdm->pos.position_type & CAM_DEV_POS_DEVICE)
1536          && (cdm->pos.cookie.device != NULL))
1537                 return(xptdevicetraverse(target,
1538                                         (struct cam_ed *)cdm->pos.cookie.device,
1539                                          xptedtdevicefunc, arg));
1540         else
1541                 return(xptdevicetraverse(target, NULL, xptedtdevicefunc, arg));
1542 }
1543
1544 static int
1545 xptedtdevicefunc(struct cam_ed *device, void *arg)
1546 {
1547
1548         struct ccb_dev_match *cdm;
1549         dev_match_ret retval;
1550
1551         cdm = (struct ccb_dev_match *)arg;
1552
1553         /*
1554          * If our position is for something deeper in the tree, that means
1555          * that we've already seen this node.  So, we keep going down.
1556          */
1557         if ((cdm->pos.position_type & CAM_DEV_POS_DEVICE)
1558          && (cdm->pos.cookie.device == device)
1559          && (cdm->pos.position_type & CAM_DEV_POS_PERIPH)
1560          && (cdm->pos.cookie.periph != NULL))
1561                 retval = DM_RET_DESCEND;
1562         else
1563                 retval = xptdevicematch(cdm->patterns, cdm->num_patterns,
1564                                         device);
1565
1566         if ((retval & DM_RET_ACTION_MASK) == DM_RET_ERROR) {
1567                 cdm->status = CAM_DEV_MATCH_ERROR;
1568                 return(0);
1569         }
1570
1571         /*
1572          * If the copy flag is set, copy this device out.
1573          */
1574         if (retval & DM_RET_COPY) {
1575                 int spaceleft, j;
1576
1577                 spaceleft = cdm->match_buf_len - (cdm->num_matches *
1578                         sizeof(struct dev_match_result));
1579
1580                 /*
1581                  * If we don't have enough space to put in another
1582                  * match result, save our position and tell the
1583                  * user there are more devices to check.
1584                  */
1585                 if (spaceleft < sizeof(struct dev_match_result)) {
1586                         bzero(&cdm->pos, sizeof(cdm->pos));
1587                         cdm->pos.position_type =
1588                                 CAM_DEV_POS_EDT | CAM_DEV_POS_BUS |
1589                                 CAM_DEV_POS_TARGET | CAM_DEV_POS_DEVICE;
1590
1591                         cdm->pos.cookie.bus = device->target->bus;
1592                         cdm->pos.generations[CAM_BUS_GENERATION]=
1593                                 xsoftc.bus_generation;
1594                         cdm->pos.cookie.target = device->target;
1595                         cdm->pos.generations[CAM_TARGET_GENERATION] =
1596                                 device->target->bus->generation;
1597                         cdm->pos.cookie.device = device;
1598                         cdm->pos.generations[CAM_DEV_GENERATION] =
1599                                 device->target->generation;
1600                         cdm->status = CAM_DEV_MATCH_MORE;
1601                         return(0);
1602                 }
1603                 j = cdm->num_matches;
1604                 cdm->num_matches++;
1605                 cdm->matches[j].type = DEV_MATCH_DEVICE;
1606                 cdm->matches[j].result.device_result.path_id =
1607                         device->target->bus->path_id;
1608                 cdm->matches[j].result.device_result.target_id =
1609                         device->target->target_id;
1610                 cdm->matches[j].result.device_result.target_lun =
1611                         device->lun_id;
1612                 cdm->matches[j].result.device_result.protocol =
1613                         device->protocol;
1614                 bcopy(&device->inq_data,
1615                       &cdm->matches[j].result.device_result.inq_data,
1616                       sizeof(struct scsi_inquiry_data));
1617                 bcopy(&device->ident_data,
1618                       &cdm->matches[j].result.device_result.ident_data,
1619                       sizeof(struct ata_params));
1620
1621                 /* Let the user know whether this device is unconfigured */
1622                 if (device->flags & CAM_DEV_UNCONFIGURED)
1623                         cdm->matches[j].result.device_result.flags =
1624                                 DEV_RESULT_UNCONFIGURED;
1625                 else
1626                         cdm->matches[j].result.device_result.flags =
1627                                 DEV_RESULT_NOFLAG;
1628         }
1629
1630         /*
1631          * If the user isn't interested in peripherals, don't descend
1632          * the tree any further.
1633          */
1634         if ((retval & DM_RET_ACTION_MASK) == DM_RET_STOP)
1635                 return(1);
1636
1637         /*
1638          * If there is a peripheral list generation recorded, make sure
1639          * it hasn't changed.
1640          */
1641         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
1642          && (device->target->bus == cdm->pos.cookie.bus)
1643          && (cdm->pos.position_type & CAM_DEV_POS_TARGET)
1644          && (device->target == cdm->pos.cookie.target)
1645          && (cdm->pos.position_type & CAM_DEV_POS_DEVICE)
1646          && (device == cdm->pos.cookie.device)
1647          && (cdm->pos.position_type & CAM_DEV_POS_PERIPH)
1648          && (cdm->pos.generations[CAM_PERIPH_GENERATION] != 0)
1649          && (cdm->pos.generations[CAM_PERIPH_GENERATION] !=
1650              device->generation)){
1651                 cdm->status = CAM_DEV_MATCH_LIST_CHANGED;
1652                 return(0);
1653         }
1654
1655         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
1656          && (cdm->pos.cookie.bus == device->target->bus)
1657          && (cdm->pos.position_type & CAM_DEV_POS_TARGET)
1658          && (cdm->pos.cookie.target == device->target)
1659          && (cdm->pos.position_type & CAM_DEV_POS_DEVICE)
1660          && (cdm->pos.cookie.device == device)
1661          && (cdm->pos.position_type & CAM_DEV_POS_PERIPH)
1662          && (cdm->pos.cookie.periph != NULL))
1663                 return(xptperiphtraverse(device,
1664                                 (struct cam_periph *)cdm->pos.cookie.periph,
1665                                 xptedtperiphfunc, arg));
1666         else
1667                 return(xptperiphtraverse(device, NULL, xptedtperiphfunc, arg));
1668 }
1669
1670 static int
1671 xptedtperiphfunc(struct cam_periph *periph, void *arg)
1672 {
1673         struct ccb_dev_match *cdm;
1674         dev_match_ret retval;
1675
1676         cdm = (struct ccb_dev_match *)arg;
1677
1678         retval = xptperiphmatch(cdm->patterns, cdm->num_patterns, periph);
1679
1680         if ((retval & DM_RET_ACTION_MASK) == DM_RET_ERROR) {
1681                 cdm->status = CAM_DEV_MATCH_ERROR;
1682                 return(0);
1683         }
1684
1685         /*
1686          * If the copy flag is set, copy this peripheral out.
1687          */
1688         if (retval & DM_RET_COPY) {
1689                 int spaceleft, j;
1690
1691                 spaceleft = cdm->match_buf_len - (cdm->num_matches *
1692                         sizeof(struct dev_match_result));
1693
1694                 /*
1695                  * If we don't have enough space to put in another
1696                  * match result, save our position and tell the
1697                  * user there are more devices to check.
1698                  */
1699                 if (spaceleft < sizeof(struct dev_match_result)) {
1700                         bzero(&cdm->pos, sizeof(cdm->pos));
1701                         cdm->pos.position_type =
1702                                 CAM_DEV_POS_EDT | CAM_DEV_POS_BUS |
1703                                 CAM_DEV_POS_TARGET | CAM_DEV_POS_DEVICE |
1704                                 CAM_DEV_POS_PERIPH;
1705
1706                         cdm->pos.cookie.bus = periph->path->bus;
1707                         cdm->pos.generations[CAM_BUS_GENERATION]=
1708                                 xsoftc.bus_generation;
1709                         cdm->pos.cookie.target = periph->path->target;
1710                         cdm->pos.generations[CAM_TARGET_GENERATION] =
1711                                 periph->path->bus->generation;
1712                         cdm->pos.cookie.device = periph->path->device;
1713                         cdm->pos.generations[CAM_DEV_GENERATION] =
1714                                 periph->path->target->generation;
1715                         cdm->pos.cookie.periph = periph;
1716                         cdm->pos.generations[CAM_PERIPH_GENERATION] =
1717                                 periph->path->device->generation;
1718                         cdm->status = CAM_DEV_MATCH_MORE;
1719                         return(0);
1720                 }
1721
1722                 j = cdm->num_matches;
1723                 cdm->num_matches++;
1724                 cdm->matches[j].type = DEV_MATCH_PERIPH;
1725                 cdm->matches[j].result.periph_result.path_id =
1726                         periph->path->bus->path_id;
1727                 cdm->matches[j].result.periph_result.target_id =
1728                         periph->path->target->target_id;
1729                 cdm->matches[j].result.periph_result.target_lun =
1730                         periph->path->device->lun_id;
1731                 cdm->matches[j].result.periph_result.unit_number =
1732                         periph->unit_number;
1733                 strncpy(cdm->matches[j].result.periph_result.periph_name,
1734                         periph->periph_name, DEV_IDLEN);
1735         }
1736
1737         return(1);
1738 }
1739
1740 static int
1741 xptedtmatch(struct ccb_dev_match *cdm)
1742 {
1743         int ret;
1744
1745         cdm->num_matches = 0;
1746
1747         /*
1748          * Check the bus list generation.  If it has changed, the user
1749          * needs to reset everything and start over.
1750          */
1751         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
1752          && (cdm->pos.generations[CAM_BUS_GENERATION] != 0)
1753          && (cdm->pos.generations[CAM_BUS_GENERATION] != xsoftc.bus_generation)) {
1754                 cdm->status = CAM_DEV_MATCH_LIST_CHANGED;
1755                 return(0);
1756         }
1757
1758         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
1759          && (cdm->pos.cookie.bus != NULL))
1760                 ret = xptbustraverse((struct cam_eb *)cdm->pos.cookie.bus,
1761                                      xptedtbusfunc, cdm);
1762         else
1763                 ret = xptbustraverse(NULL, xptedtbusfunc, cdm);
1764
1765         /*
1766          * If we get back 0, that means that we had to stop before fully
1767          * traversing the EDT.  It also means that one of the subroutines
1768          * has set the status field to the proper value.  If we get back 1,
1769          * we've fully traversed the EDT and copied out any matching entries.
1770          */
1771         if (ret == 1)
1772                 cdm->status = CAM_DEV_MATCH_LAST;
1773
1774         return(ret);
1775 }
1776
1777 static int
1778 xptplistpdrvfunc(struct periph_driver **pdrv, void *arg)
1779 {
1780         struct ccb_dev_match *cdm;
1781
1782         cdm = (struct ccb_dev_match *)arg;
1783
1784         if ((cdm->pos.position_type & CAM_DEV_POS_PDPTR)
1785          && (cdm->pos.cookie.pdrv == pdrv)
1786          && (cdm->pos.position_type & CAM_DEV_POS_PERIPH)
1787          && (cdm->pos.generations[CAM_PERIPH_GENERATION] != 0)
1788          && (cdm->pos.generations[CAM_PERIPH_GENERATION] !=
1789              (*pdrv)->generation)) {
1790                 cdm->status = CAM_DEV_MATCH_LIST_CHANGED;
1791                 return(0);
1792         }
1793
1794         if ((cdm->pos.position_type & CAM_DEV_POS_PDPTR)
1795          && (cdm->pos.cookie.pdrv == pdrv)
1796          && (cdm->pos.position_type & CAM_DEV_POS_PERIPH)
1797          && (cdm->pos.cookie.periph != NULL))
1798                 return(xptpdperiphtraverse(pdrv,
1799                                 (struct cam_periph *)cdm->pos.cookie.periph,
1800                                 xptplistperiphfunc, arg));
1801         else
1802                 return(xptpdperiphtraverse(pdrv, NULL,xptplistperiphfunc, arg));
1803 }
1804
1805 static int
1806 xptplistperiphfunc(struct cam_periph *periph, void *arg)
1807 {
1808         struct ccb_dev_match *cdm;
1809         dev_match_ret retval;
1810
1811         cdm = (struct ccb_dev_match *)arg;
1812
1813         retval = xptperiphmatch(cdm->patterns, cdm->num_patterns, periph);
1814
1815         if ((retval & DM_RET_ACTION_MASK) == DM_RET_ERROR) {
1816                 cdm->status = CAM_DEV_MATCH_ERROR;
1817                 return(0);
1818         }
1819
1820         /*
1821          * If the copy flag is set, copy this peripheral out.
1822          */
1823         if (retval & DM_RET_COPY) {
1824                 int spaceleft, j;
1825
1826                 spaceleft = cdm->match_buf_len - (cdm->num_matches *
1827                         sizeof(struct dev_match_result));
1828
1829                 /*
1830                  * If we don't have enough space to put in another
1831                  * match result, save our position and tell the
1832                  * user there are more devices to check.
1833                  */
1834                 if (spaceleft < sizeof(struct dev_match_result)) {
1835                         struct periph_driver **pdrv;
1836
1837                         pdrv = NULL;
1838                         bzero(&cdm->pos, sizeof(cdm->pos));
1839                         cdm->pos.position_type =
1840                                 CAM_DEV_POS_PDRV | CAM_DEV_POS_PDPTR |
1841                                 CAM_DEV_POS_PERIPH;
1842
1843                         /*
1844                          * This may look a bit non-sensical, but it is
1845                          * actually quite logical.  There are very few
1846                          * peripheral drivers, and bloating every peripheral
1847                          * structure with a pointer back to its parent
1848                          * peripheral driver linker set entry would cost
1849                          * more in the long run than doing this quick lookup.
1850                          */
1851                         for (pdrv = periph_drivers; *pdrv != NULL; pdrv++) {
1852                                 if (strcmp((*pdrv)->driver_name,
1853                                     periph->periph_name) == 0)
1854                                         break;
1855                         }
1856
1857                         if (*pdrv == NULL) {
1858                                 cdm->status = CAM_DEV_MATCH_ERROR;
1859                                 return(0);
1860                         }
1861
1862                         cdm->pos.cookie.pdrv = pdrv;
1863                         /*
1864                          * The periph generation slot does double duty, as
1865                          * does the periph pointer slot.  They are used for
1866                          * both edt and pdrv lookups and positioning.
1867                          */
1868                         cdm->pos.cookie.periph = periph;
1869                         cdm->pos.generations[CAM_PERIPH_GENERATION] =
1870                                 (*pdrv)->generation;
1871                         cdm->status = CAM_DEV_MATCH_MORE;
1872                         return(0);
1873                 }
1874
1875                 j = cdm->num_matches;
1876                 cdm->num_matches++;
1877                 cdm->matches[j].type = DEV_MATCH_PERIPH;
1878                 cdm->matches[j].result.periph_result.path_id =
1879                         periph->path->bus->path_id;
1880
1881                 /*
1882                  * The transport layer peripheral doesn't have a target or
1883                  * lun.
1884                  */
1885                 if (periph->path->target)
1886                         cdm->matches[j].result.periph_result.target_id =
1887                                 periph->path->target->target_id;
1888                 else
1889                         cdm->matches[j].result.periph_result.target_id = -1;
1890
1891                 if (periph->path->device)
1892                         cdm->matches[j].result.periph_result.target_lun =
1893                                 periph->path->device->lun_id;
1894                 else
1895                         cdm->matches[j].result.periph_result.target_lun = -1;
1896
1897                 cdm->matches[j].result.periph_result.unit_number =
1898                         periph->unit_number;
1899                 strncpy(cdm->matches[j].result.periph_result.periph_name,
1900                         periph->periph_name, DEV_IDLEN);
1901         }
1902
1903         return(1);
1904 }
1905
1906 static int
1907 xptperiphlistmatch(struct ccb_dev_match *cdm)
1908 {
1909         int ret;
1910
1911         cdm->num_matches = 0;
1912
1913         /*
1914          * At this point in the edt traversal function, we check the bus
1915          * list generation to make sure that no busses have been added or
1916          * removed since the user last sent a XPT_DEV_MATCH ccb through.
1917          * For the peripheral driver list traversal function, however, we
1918          * don't have to worry about new peripheral driver types coming or
1919          * going; they're in a linker set, and therefore can't change
1920          * without a recompile.
1921          */
1922
1923         if ((cdm->pos.position_type & CAM_DEV_POS_PDPTR)
1924          && (cdm->pos.cookie.pdrv != NULL))
1925                 ret = xptpdrvtraverse(
1926                                 (struct periph_driver **)cdm->pos.cookie.pdrv,
1927                                 xptplistpdrvfunc, cdm);
1928         else
1929                 ret = xptpdrvtraverse(NULL, xptplistpdrvfunc, cdm);
1930
1931         /*
1932          * If we get back 0, that means that we had to stop before fully
1933          * traversing the peripheral driver tree.  It also means that one of
1934          * the subroutines has set the status field to the proper value.  If
1935          * we get back 1, we've fully traversed the EDT and copied out any
1936          * matching entries.
1937          */
1938         if (ret == 1)
1939                 cdm->status = CAM_DEV_MATCH_LAST;
1940
1941         return(ret);
1942 }
1943
1944 static int
1945 xptbustraverse(struct cam_eb *start_bus, xpt_busfunc_t *tr_func, void *arg)
1946 {
1947         struct cam_eb *bus, *next_bus;
1948         int retval;
1949
1950         retval = 1;
1951
1952         mtx_lock(&xsoftc.xpt_topo_lock);
1953         for (bus = (start_bus ? start_bus : TAILQ_FIRST(&xsoftc.xpt_busses));
1954              bus != NULL;
1955              bus = next_bus) {
1956                 next_bus = TAILQ_NEXT(bus, links);
1957
1958                 mtx_unlock(&xsoftc.xpt_topo_lock);
1959                 CAM_SIM_LOCK(bus->sim);
1960                 retval = tr_func(bus, arg);
1961                 CAM_SIM_UNLOCK(bus->sim);
1962                 if (retval == 0)
1963                         return(retval);
1964                 mtx_lock(&xsoftc.xpt_topo_lock);
1965         }
1966         mtx_unlock(&xsoftc.xpt_topo_lock);
1967
1968         return(retval);
1969 }
1970
1971 int
1972 xpt_sim_opened(struct cam_sim *sim)
1973 {
1974         struct cam_eb *bus;
1975         struct cam_et *target;
1976         struct cam_ed *device;
1977         struct cam_periph *periph;
1978
1979         KASSERT(sim->refcount >= 1, ("sim->refcount >= 1"));
1980         mtx_assert(sim->mtx, MA_OWNED);
1981
1982         mtx_lock(&xsoftc.xpt_topo_lock);
1983         TAILQ_FOREACH(bus, &xsoftc.xpt_busses, links) {
1984                 if (bus->sim != sim)
1985                         continue;
1986
1987                 TAILQ_FOREACH(target, &bus->et_entries, links) {
1988                         TAILQ_FOREACH(device, &target->ed_entries, links) {
1989                                 SLIST_FOREACH(periph, &device->periphs,
1990                                     periph_links) {
1991                                         if (periph->refcount > 0) {
1992                                                 mtx_unlock(&xsoftc.xpt_topo_lock);
1993                                                 return (1);
1994                                         }
1995                                 }
1996                         }
1997                 }
1998         }
1999
2000         mtx_unlock(&xsoftc.xpt_topo_lock);
2001         return (0);
2002 }
2003
2004 static int
2005 xpttargettraverse(struct cam_eb *bus, struct cam_et *start_target,
2006                   xpt_targetfunc_t *tr_func, void *arg)
2007 {
2008         struct cam_et *target, *next_target;
2009         int retval;
2010
2011         retval = 1;
2012         for (target = (start_target ? start_target :
2013                        TAILQ_FIRST(&bus->et_entries));
2014              target != NULL; target = next_target) {
2015
2016                 next_target = TAILQ_NEXT(target, links);
2017
2018                 retval = tr_func(target, arg);
2019
2020                 if (retval == 0)
2021                         return(retval);
2022         }
2023
2024         return(retval);
2025 }
2026
2027 static int
2028 xptdevicetraverse(struct cam_et *target, struct cam_ed *start_device,
2029                   xpt_devicefunc_t *tr_func, void *arg)
2030 {
2031         struct cam_ed *device, *next_device;
2032         int retval;
2033
2034         retval = 1;
2035         for (device = (start_device ? start_device :
2036                        TAILQ_FIRST(&target->ed_entries));
2037              device != NULL;
2038              device = next_device) {
2039
2040                 next_device = TAILQ_NEXT(device, links);
2041
2042                 retval = tr_func(device, arg);
2043
2044                 if (retval == 0)
2045                         return(retval);
2046         }
2047
2048         return(retval);
2049 }
2050
2051 static int
2052 xptperiphtraverse(struct cam_ed *device, struct cam_periph *start_periph,
2053                   xpt_periphfunc_t *tr_func, void *arg)
2054 {
2055         struct cam_periph *periph, *next_periph;
2056         int retval;
2057
2058         retval = 1;
2059
2060         for (periph = (start_periph ? start_periph :
2061                        SLIST_FIRST(&device->periphs));
2062              periph != NULL;
2063              periph = next_periph) {
2064
2065                 next_periph = SLIST_NEXT(periph, periph_links);
2066
2067                 retval = tr_func(periph, arg);
2068                 if (retval == 0)
2069                         return(retval);
2070         }
2071
2072         return(retval);
2073 }
2074
2075 static int
2076 xptpdrvtraverse(struct periph_driver **start_pdrv,
2077                 xpt_pdrvfunc_t *tr_func, void *arg)
2078 {
2079         struct periph_driver **pdrv;
2080         int retval;
2081
2082         retval = 1;
2083
2084         /*
2085          * We don't traverse the peripheral driver list like we do the
2086          * other lists, because it is a linker set, and therefore cannot be
2087          * changed during runtime.  If the peripheral driver list is ever
2088          * re-done to be something other than a linker set (i.e. it can
2089          * change while the system is running), the list traversal should
2090          * be modified to work like the other traversal functions.
2091          */
2092         for (pdrv = (start_pdrv ? start_pdrv : periph_drivers);
2093              *pdrv != NULL; pdrv++) {
2094                 retval = tr_func(pdrv, arg);
2095
2096                 if (retval == 0)
2097                         return(retval);
2098         }
2099
2100         return(retval);
2101 }
2102
2103 static int
2104 xptpdperiphtraverse(struct periph_driver **pdrv,
2105                     struct cam_periph *start_periph,
2106                     xpt_periphfunc_t *tr_func, void *arg)
2107 {
2108         struct cam_periph *periph, *next_periph;
2109         int retval;
2110
2111         retval = 1;
2112
2113         xpt_lock_buses();
2114         for (periph = (start_periph ? start_periph :
2115              TAILQ_FIRST(&(*pdrv)->units)); periph != NULL;
2116              periph = next_periph) {
2117
2118                 next_periph = TAILQ_NEXT(periph, unit_links);
2119
2120                 retval = tr_func(periph, arg);
2121                 if (retval == 0) {
2122                         xpt_unlock_buses();
2123                         return(retval);
2124                 }
2125         }
2126         xpt_unlock_buses();
2127         return(retval);
2128 }
2129
2130 static int
2131 xptdefbusfunc(struct cam_eb *bus, void *arg)
2132 {
2133         struct xpt_traverse_config *tr_config;
2134
2135         tr_config = (struct xpt_traverse_config *)arg;
2136
2137         if (tr_config->depth == XPT_DEPTH_BUS) {
2138                 xpt_busfunc_t *tr_func;
2139
2140                 tr_func = (xpt_busfunc_t *)tr_config->tr_func;
2141
2142                 return(tr_func(bus, tr_config->tr_arg));
2143         } else
2144                 return(xpttargettraverse(bus, NULL, xptdeftargetfunc, arg));
2145 }
2146
2147 static int
2148 xptdeftargetfunc(struct cam_et *target, void *arg)
2149 {
2150         struct xpt_traverse_config *tr_config;
2151
2152         tr_config = (struct xpt_traverse_config *)arg;
2153
2154         if (tr_config->depth == XPT_DEPTH_TARGET) {
2155                 xpt_targetfunc_t *tr_func;
2156
2157                 tr_func = (xpt_targetfunc_t *)tr_config->tr_func;
2158
2159                 return(tr_func(target, tr_config->tr_arg));
2160         } else
2161                 return(xptdevicetraverse(target, NULL, xptdefdevicefunc, arg));
2162 }
2163
2164 static int
2165 xptdefdevicefunc(struct cam_ed *device, void *arg)
2166 {
2167         struct xpt_traverse_config *tr_config;
2168
2169         tr_config = (struct xpt_traverse_config *)arg;
2170
2171         if (tr_config->depth == XPT_DEPTH_DEVICE) {
2172                 xpt_devicefunc_t *tr_func;
2173
2174                 tr_func = (xpt_devicefunc_t *)tr_config->tr_func;
2175
2176                 return(tr_func(device, tr_config->tr_arg));
2177         } else
2178                 return(xptperiphtraverse(device, NULL, xptdefperiphfunc, arg));
2179 }
2180
2181 static int
2182 xptdefperiphfunc(struct cam_periph *periph, void *arg)
2183 {
2184         struct xpt_traverse_config *tr_config;
2185         xpt_periphfunc_t *tr_func;
2186
2187         tr_config = (struct xpt_traverse_config *)arg;
2188
2189         tr_func = (xpt_periphfunc_t *)tr_config->tr_func;
2190
2191         /*
2192          * Unlike the other default functions, we don't check for depth
2193          * here.  The peripheral driver level is the last level in the EDT,
2194          * so if we're here, we should execute the function in question.
2195          */
2196         return(tr_func(periph, tr_config->tr_arg));
2197 }
2198
2199 /*
2200  * Execute the given function for every bus in the EDT.
2201  */
2202 static int
2203 xpt_for_all_busses(xpt_busfunc_t *tr_func, void *arg)
2204 {
2205         struct xpt_traverse_config tr_config;
2206
2207         tr_config.depth = XPT_DEPTH_BUS;
2208         tr_config.tr_func = tr_func;
2209         tr_config.tr_arg = arg;
2210
2211         return(xptbustraverse(NULL, xptdefbusfunc, &tr_config));
2212 }
2213
2214 /*
2215  * Execute the given function for every device in the EDT.
2216  */
2217 static int
2218 xpt_for_all_devices(xpt_devicefunc_t *tr_func, void *arg)
2219 {
2220         struct xpt_traverse_config tr_config;
2221
2222         tr_config.depth = XPT_DEPTH_DEVICE;
2223         tr_config.tr_func = tr_func;
2224         tr_config.tr_arg = arg;
2225
2226         return(xptbustraverse(NULL, xptdefbusfunc, &tr_config));
2227 }
2228
2229 static int
2230 xptsetasyncfunc(struct cam_ed *device, void *arg)
2231 {
2232         struct cam_path path;
2233         struct ccb_getdev cgd;
2234         struct ccb_setasync *csa = (struct ccb_setasync *)arg;
2235
2236         /*
2237          * Don't report unconfigured devices (Wildcard devs,
2238          * devices only for target mode, device instances
2239          * that have been invalidated but are waiting for
2240          * their last reference count to be released).
2241          */
2242         if ((device->flags & CAM_DEV_UNCONFIGURED) != 0)
2243                 return (1);
2244
2245         xpt_compile_path(&path,
2246                          NULL,
2247                          device->target->bus->path_id,
2248                          device->target->target_id,
2249                          device->lun_id);
2250         xpt_setup_ccb(&cgd.ccb_h, &path, CAM_PRIORITY_NORMAL);
2251         cgd.ccb_h.func_code = XPT_GDEV_TYPE;
2252         xpt_action((union ccb *)&cgd);
2253         csa->callback(csa->callback_arg,
2254                             AC_FOUND_DEVICE,
2255                             &path, &cgd);
2256         xpt_release_path(&path);
2257
2258         return(1);
2259 }
2260
2261 static int
2262 xptsetasyncbusfunc(struct cam_eb *bus, void *arg)
2263 {
2264         struct cam_path path;
2265         struct ccb_pathinq cpi;
2266         struct ccb_setasync *csa = (struct ccb_setasync *)arg;
2267
2268         xpt_compile_path(&path, /*periph*/NULL,
2269                          bus->sim->path_id,
2270                          CAM_TARGET_WILDCARD,
2271                          CAM_LUN_WILDCARD);
2272         xpt_setup_ccb(&cpi.ccb_h, &path, CAM_PRIORITY_NORMAL);
2273         cpi.ccb_h.func_code = XPT_PATH_INQ;
2274         xpt_action((union ccb *)&cpi);
2275         csa->callback(csa->callback_arg,
2276                             AC_PATH_REGISTERED,
2277                             &path, &cpi);
2278         xpt_release_path(&path);
2279
2280         return(1);
2281 }
2282
2283 void
2284 xpt_action(union ccb *start_ccb)
2285 {
2286
2287         CAM_DEBUG(start_ccb->ccb_h.path, CAM_DEBUG_TRACE, ("xpt_action\n"));
2288
2289         start_ccb->ccb_h.status = CAM_REQ_INPROG;
2290         /* Compatibility for RL-unaware code. */
2291         if (CAM_PRIORITY_TO_RL(start_ccb->ccb_h.pinfo.priority) == 0)
2292             start_ccb->ccb_h.pinfo.priority += CAM_PRIORITY_NORMAL - 1;
2293         (*(start_ccb->ccb_h.path->bus->xport->action))(start_ccb);
2294 }
2295
2296 void
2297 xpt_action_default(union ccb *start_ccb)
2298 {
2299 #ifdef CAMDEBUG
2300         char cdb_str[(SCSI_MAX_CDBLEN * 3) + 1];
2301 #endif
2302         struct cam_path *path;
2303
2304         path = start_ccb->ccb_h.path;
2305         CAM_DEBUG(path, CAM_DEBUG_TRACE, ("xpt_action_default\n"));
2306
2307         switch (start_ccb->ccb_h.func_code) {
2308         case XPT_SCSI_IO:
2309         {
2310                 struct cam_ed *device;
2311
2312                 /*
2313                  * For the sake of compatibility with SCSI-1
2314                  * devices that may not understand the identify
2315                  * message, we include lun information in the
2316                  * second byte of all commands.  SCSI-1 specifies
2317                  * that luns are a 3 bit value and reserves only 3
2318                  * bits for lun information in the CDB.  Later
2319                  * revisions of the SCSI spec allow for more than 8
2320                  * luns, but have deprecated lun information in the
2321                  * CDB.  So, if the lun won't fit, we must omit.
2322                  *
2323                  * Also be aware that during initial probing for devices,
2324                  * the inquiry information is unknown but initialized to 0.
2325                  * This means that this code will be exercised while probing
2326                  * devices with an ANSI revision greater than 2.
2327                  */
2328                 device = path->device;
2329                 if (device->protocol_version <= SCSI_REV_2
2330                  && start_ccb->ccb_h.target_lun < 8
2331                  && (start_ccb->ccb_h.flags & CAM_CDB_POINTER) == 0) {
2332
2333                         start_ccb->csio.cdb_io.cdb_bytes[1] |=
2334                             start_ccb->ccb_h.target_lun << 5;
2335                 }
2336                 start_ccb->csio.scsi_status = SCSI_STATUS_OK;
2337                 CAM_DEBUG(path, CAM_DEBUG_CDB,("%s. CDB: %s\n",
2338                           scsi_op_desc(start_ccb->csio.cdb_io.cdb_bytes[0],
2339                                        &path->device->inq_data),
2340                           scsi_cdb_string(start_ccb->csio.cdb_io.cdb_bytes,
2341                                           cdb_str, sizeof(cdb_str))));
2342         }
2343         /* FALLTHROUGH */
2344         case XPT_TARGET_IO:
2345         case XPT_CONT_TARGET_IO:
2346                 start_ccb->csio.sense_resid = 0;
2347                 start_ccb->csio.resid = 0;
2348                 /* FALLTHROUGH */
2349         case XPT_ATA_IO:
2350                 if (start_ccb->ccb_h.func_code == XPT_ATA_IO) {
2351                         start_ccb->ataio.resid = 0;
2352                         CAM_DEBUG(path, CAM_DEBUG_CDB,("%s. ACB: %s\n",
2353                             ata_op_string(&start_ccb->ataio.cmd),
2354                             ata_cmd_string(&start_ccb->ataio.cmd,
2355                                           cdb_str, sizeof(cdb_str))));
2356                 }
2357                 /* FALLTHROUGH */
2358         case XPT_RESET_DEV:
2359         case XPT_ENG_EXEC:
2360         {
2361                 int frozen;
2362
2363                 frozen = cam_ccbq_insert_ccb(&path->device->ccbq, start_ccb);
2364                 path->device->sim->devq->alloc_openings += frozen;
2365                 if (frozen > 0)
2366                         xpt_run_dev_allocq(path->bus);
2367                 if (xpt_schedule_dev_sendq(path->bus, path->device))
2368                         xpt_run_dev_sendq(path->bus);
2369                 break;
2370         }
2371         case XPT_CALC_GEOMETRY:
2372         {
2373                 struct cam_sim *sim;
2374
2375                 /* Filter out garbage */
2376                 if (start_ccb->ccg.block_size == 0
2377                  || start_ccb->ccg.volume_size == 0) {
2378                         start_ccb->ccg.cylinders = 0;
2379                         start_ccb->ccg.heads = 0;
2380                         start_ccb->ccg.secs_per_track = 0;
2381                         start_ccb->ccb_h.status = CAM_REQ_CMP;
2382                         break;
2383                 }
2384 #ifdef PC98
2385                 /*
2386                  * In a PC-98 system, geometry translation depens on
2387                  * the "real" device geometry obtained from mode page 4.
2388                  * SCSI geometry translation is performed in the
2389                  * initialization routine of the SCSI BIOS and the result
2390                  * stored in host memory.  If the translation is available
2391                  * in host memory, use it.  If not, rely on the default
2392                  * translation the device driver performs.
2393                  */
2394                 if (scsi_da_bios_params(&start_ccb->ccg) != 0) {
2395                         start_ccb->ccb_h.status = CAM_REQ_CMP;
2396                         break;
2397                 }
2398 #endif
2399                 sim = path->bus->sim;
2400                 (*(sim->sim_action))(sim, start_ccb);
2401                 break;
2402         }
2403         case XPT_ABORT:
2404         {
2405                 union ccb* abort_ccb;
2406
2407                 abort_ccb = start_ccb->cab.abort_ccb;
2408                 if (XPT_FC_IS_DEV_QUEUED(abort_ccb)) {
2409
2410                         if (abort_ccb->ccb_h.pinfo.index >= 0) {
2411                                 struct cam_ccbq *ccbq;
2412                                 struct cam_ed *device;
2413
2414                                 device = abort_ccb->ccb_h.path->device;
2415                                 ccbq = &device->ccbq;
2416                                 device->sim->devq->alloc_openings -=
2417                                     cam_ccbq_remove_ccb(ccbq, abort_ccb);
2418                                 abort_ccb->ccb_h.status =
2419                                     CAM_REQ_ABORTED|CAM_DEV_QFRZN;
2420                                 xpt_freeze_devq(abort_ccb->ccb_h.path, 1);
2421                                 xpt_done(abort_ccb);
2422                                 start_ccb->ccb_h.status = CAM_REQ_CMP;
2423                                 break;
2424                         }
2425                         if (abort_ccb->ccb_h.pinfo.index == CAM_UNQUEUED_INDEX
2426                          && (abort_ccb->ccb_h.status & CAM_SIM_QUEUED) == 0) {
2427                                 /*
2428                                  * We've caught this ccb en route to
2429                                  * the SIM.  Flag it for abort and the
2430                                  * SIM will do so just before starting
2431                                  * real work on the CCB.
2432                                  */
2433                                 abort_ccb->ccb_h.status =
2434                                     CAM_REQ_ABORTED|CAM_DEV_QFRZN;
2435                                 xpt_freeze_devq(abort_ccb->ccb_h.path, 1);
2436                                 start_ccb->ccb_h.status = CAM_REQ_CMP;
2437                                 break;
2438                         }
2439                 }
2440                 if (XPT_FC_IS_QUEUED(abort_ccb)
2441                  && (abort_ccb->ccb_h.pinfo.index == CAM_DONEQ_INDEX)) {
2442                         /*
2443                          * It's already completed but waiting
2444                          * for our SWI to get to it.
2445                          */
2446                         start_ccb->ccb_h.status = CAM_UA_ABORT;
2447                         break;
2448                 }
2449                 /*
2450                  * If we weren't able to take care of the abort request
2451                  * in the XPT, pass the request down to the SIM for processing.
2452                  */
2453         }
2454         /* FALLTHROUGH */
2455         case XPT_ACCEPT_TARGET_IO:
2456         case XPT_EN_LUN:
2457         case XPT_IMMED_NOTIFY:
2458         case XPT_NOTIFY_ACK:
2459         case XPT_RESET_BUS:
2460         case XPT_IMMEDIATE_NOTIFY:
2461         case XPT_NOTIFY_ACKNOWLEDGE:
2462         case XPT_GET_SIM_KNOB:
2463         case XPT_SET_SIM_KNOB:
2464         {
2465                 struct cam_sim *sim;
2466
2467                 sim = path->bus->sim;
2468                 (*(sim->sim_action))(sim, start_ccb);
2469                 break;
2470         }
2471         case XPT_PATH_INQ:
2472         {
2473                 struct cam_sim *sim;
2474
2475                 sim = path->bus->sim;
2476                 (*(sim->sim_action))(sim, start_ccb);
2477                 break;
2478         }
2479         case XPT_PATH_STATS:
2480                 start_ccb->cpis.last_reset = path->bus->last_reset;
2481                 start_ccb->ccb_h.status = CAM_REQ_CMP;
2482                 break;
2483         case XPT_GDEV_TYPE:
2484         {
2485                 struct cam_ed *dev;
2486
2487                 dev = path->device;
2488                 if ((dev->flags & CAM_DEV_UNCONFIGURED) != 0) {
2489                         start_ccb->ccb_h.status = CAM_DEV_NOT_THERE;
2490                 } else {
2491                         struct ccb_getdev *cgd;
2492                         struct cam_eb *bus;
2493                         struct cam_et *tar;
2494
2495                         cgd = &start_ccb->cgd;
2496                         bus = cgd->ccb_h.path->bus;
2497                         tar = cgd->ccb_h.path->target;
2498                         cgd->protocol = dev->protocol;
2499                         cgd->inq_data = dev->inq_data;
2500                         cgd->ident_data = dev->ident_data;
2501                         cgd->inq_flags = dev->inq_flags;
2502                         cgd->ccb_h.status = CAM_REQ_CMP;
2503                         cgd->serial_num_len = dev->serial_num_len;
2504                         if ((dev->serial_num_len > 0)
2505                          && (dev->serial_num != NULL))
2506                                 bcopy(dev->serial_num, cgd->serial_num,
2507                                       dev->serial_num_len);
2508                 }
2509                 break;
2510         }
2511         case XPT_GDEV_STATS:
2512         {
2513                 struct cam_ed *dev;
2514
2515                 dev = path->device;
2516                 if ((dev->flags & CAM_DEV_UNCONFIGURED) != 0) {
2517                         start_ccb->ccb_h.status = CAM_DEV_NOT_THERE;
2518                 } else {
2519                         struct ccb_getdevstats *cgds;
2520                         struct cam_eb *bus;
2521                         struct cam_et *tar;
2522
2523                         cgds = &start_ccb->cgds;
2524                         bus = path->bus;
2525                         tar = path->target;
2526                         cgds->dev_openings = dev->ccbq.dev_openings;
2527                         cgds->dev_active = dev->ccbq.dev_active;
2528                         cgds->devq_openings = dev->ccbq.devq_openings;
2529                         cgds->devq_queued = dev->ccbq.queue.entries;
2530                         cgds->held = dev->ccbq.held;
2531                         cgds->last_reset = tar->last_reset;
2532                         cgds->maxtags = dev->maxtags;
2533                         cgds->mintags = dev->mintags;
2534                         if (timevalcmp(&tar->last_reset, &bus->last_reset, <))
2535                                 cgds->last_reset = bus->last_reset;
2536                         cgds->ccb_h.status = CAM_REQ_CMP;
2537                 }
2538                 break;
2539         }
2540         case XPT_GDEVLIST:
2541         {
2542                 struct cam_periph       *nperiph;
2543                 struct periph_list      *periph_head;
2544                 struct ccb_getdevlist   *cgdl;
2545                 u_int                   i;
2546                 struct cam_ed           *device;
2547                 int                     found;
2548
2549
2550                 found = 0;
2551
2552                 /*
2553                  * Don't want anyone mucking with our data.
2554                  */
2555                 device = path->device;
2556                 periph_head = &device->periphs;
2557                 cgdl = &start_ccb->cgdl;
2558
2559                 /*
2560                  * Check and see if the list has changed since the user
2561                  * last requested a list member.  If so, tell them that the
2562                  * list has changed, and therefore they need to start over
2563                  * from the beginning.
2564                  */
2565                 if ((cgdl->index != 0) &&
2566                     (cgdl->generation != device->generation)) {
2567                         cgdl->status = CAM_GDEVLIST_LIST_CHANGED;
2568                         break;
2569                 }
2570
2571                 /*
2572                  * Traverse the list of peripherals and attempt to find
2573                  * the requested peripheral.
2574                  */
2575                 for (nperiph = SLIST_FIRST(periph_head), i = 0;
2576                      (nperiph != NULL) && (i <= cgdl->index);
2577                      nperiph = SLIST_NEXT(nperiph, periph_links), i++) {
2578                         if (i == cgdl->index) {
2579                                 strncpy(cgdl->periph_name,
2580                                         nperiph->periph_name,
2581                                         DEV_IDLEN);
2582                                 cgdl->unit_number = nperiph->unit_number;
2583                                 found = 1;
2584                         }
2585                 }
2586                 if (found == 0) {
2587                         cgdl->status = CAM_GDEVLIST_ERROR;
2588                         break;
2589                 }
2590
2591                 if (nperiph == NULL)
2592                         cgdl->status = CAM_GDEVLIST_LAST_DEVICE;
2593                 else
2594                         cgdl->status = CAM_GDEVLIST_MORE_DEVS;
2595
2596                 cgdl->index++;
2597                 cgdl->generation = device->generation;
2598
2599                 cgdl->ccb_h.status = CAM_REQ_CMP;
2600                 break;
2601         }
2602         case XPT_DEV_MATCH:
2603         {
2604                 dev_pos_type position_type;
2605                 struct ccb_dev_match *cdm;
2606
2607                 cdm = &start_ccb->cdm;
2608
2609                 /*
2610                  * There are two ways of getting at information in the EDT.
2611                  * The first way is via the primary EDT tree.  It starts
2612                  * with a list of busses, then a list of targets on a bus,
2613                  * then devices/luns on a target, and then peripherals on a
2614                  * device/lun.  The "other" way is by the peripheral driver
2615                  * lists.  The peripheral driver lists are organized by
2616                  * peripheral driver.  (obviously)  So it makes sense to
2617                  * use the peripheral driver list if the user is looking
2618                  * for something like "da1", or all "da" devices.  If the
2619                  * user is looking for something on a particular bus/target
2620                  * or lun, it's generally better to go through the EDT tree.
2621                  */
2622
2623                 if (cdm->pos.position_type != CAM_DEV_POS_NONE)
2624                         position_type = cdm->pos.position_type;
2625                 else {
2626                         u_int i;
2627
2628                         position_type = CAM_DEV_POS_NONE;
2629
2630                         for (i = 0; i < cdm->num_patterns; i++) {
2631                                 if ((cdm->patterns[i].type == DEV_MATCH_BUS)
2632                                  ||(cdm->patterns[i].type == DEV_MATCH_DEVICE)){
2633                                         position_type = CAM_DEV_POS_EDT;
2634                                         break;
2635                                 }
2636                         }
2637
2638                         if (cdm->num_patterns == 0)
2639                                 position_type = CAM_DEV_POS_EDT;
2640                         else if (position_type == CAM_DEV_POS_NONE)
2641                                 position_type = CAM_DEV_POS_PDRV;
2642                 }
2643
2644                 switch(position_type & CAM_DEV_POS_TYPEMASK) {
2645                 case CAM_DEV_POS_EDT:
2646                         xptedtmatch(cdm);
2647                         break;
2648                 case CAM_DEV_POS_PDRV:
2649                         xptperiphlistmatch(cdm);
2650                         break;
2651                 default:
2652                         cdm->status = CAM_DEV_MATCH_ERROR;
2653                         break;
2654                 }
2655
2656                 if (cdm->status == CAM_DEV_MATCH_ERROR)
2657                         start_ccb->ccb_h.status = CAM_REQ_CMP_ERR;
2658                 else
2659                         start_ccb->ccb_h.status = CAM_REQ_CMP;
2660
2661                 break;
2662         }
2663         case XPT_SASYNC_CB:
2664         {
2665                 struct ccb_setasync *csa;
2666                 struct async_node *cur_entry;
2667                 struct async_list *async_head;
2668                 u_int32_t added;
2669
2670                 csa = &start_ccb->csa;
2671                 added = csa->event_enable;
2672                 async_head = &path->device->asyncs;
2673
2674                 /*
2675                  * If there is already an entry for us, simply
2676                  * update it.
2677                  */
2678                 cur_entry = SLIST_FIRST(async_head);
2679                 while (cur_entry != NULL) {
2680                         if ((cur_entry->callback_arg == csa->callback_arg)
2681                          && (cur_entry->callback == csa->callback))
2682                                 break;
2683                         cur_entry = SLIST_NEXT(cur_entry, links);
2684                 }
2685
2686                 if (cur_entry != NULL) {
2687                         /*
2688                          * If the request has no flags set,
2689                          * remove the entry.
2690                          */
2691                         added &= ~cur_entry->event_enable;
2692                         if (csa->event_enable == 0) {
2693                                 SLIST_REMOVE(async_head, cur_entry,
2694                                              async_node, links);
2695                                 xpt_release_device(path->device);
2696                                 free(cur_entry, M_CAMXPT);
2697                         } else {
2698                                 cur_entry->event_enable = csa->event_enable;
2699                         }
2700                         csa->event_enable = added;
2701                 } else {
2702                         cur_entry = malloc(sizeof(*cur_entry), M_CAMXPT,
2703                                            M_NOWAIT);
2704                         if (cur_entry == NULL) {
2705                                 csa->ccb_h.status = CAM_RESRC_UNAVAIL;
2706                                 break;
2707                         }
2708                         cur_entry->event_enable = csa->event_enable;
2709                         cur_entry->callback_arg = csa->callback_arg;
2710                         cur_entry->callback = csa->callback;
2711                         SLIST_INSERT_HEAD(async_head, cur_entry, links);
2712                         xpt_acquire_device(path->device);
2713                 }
2714                 start_ccb->ccb_h.status = CAM_REQ_CMP;
2715                 break;
2716         }
2717         case XPT_REL_SIMQ:
2718         {
2719                 struct ccb_relsim *crs;
2720                 struct cam_ed *dev;
2721
2722                 crs = &start_ccb->crs;
2723                 dev = path->device;
2724                 if (dev == NULL) {
2725
2726                         crs->ccb_h.status = CAM_DEV_NOT_THERE;
2727                         break;
2728                 }
2729
2730                 if ((crs->release_flags & RELSIM_ADJUST_OPENINGS) != 0) {
2731
2732                         if (INQ_DATA_TQ_ENABLED(&dev->inq_data)) {
2733                                 /* Don't ever go below one opening */
2734                                 if (crs->openings > 0) {
2735                                         xpt_dev_ccbq_resize(path,
2736                                                             crs->openings);
2737
2738                                         if (bootverbose) {
2739                                                 xpt_print(path,
2740                                                     "tagged openings now %d\n",
2741                                                     crs->openings);
2742                                         }
2743                                 }
2744                         }
2745                 }
2746
2747                 if ((crs->release_flags & RELSIM_RELEASE_AFTER_TIMEOUT) != 0) {
2748
2749                         if ((dev->flags & CAM_DEV_REL_TIMEOUT_PENDING) != 0) {
2750
2751                                 /*
2752                                  * Just extend the old timeout and decrement
2753                                  * the freeze count so that a single timeout
2754                                  * is sufficient for releasing the queue.
2755                                  */
2756                                 start_ccb->ccb_h.flags &= ~CAM_DEV_QFREEZE;
2757                                 callout_stop(&dev->callout);
2758                         } else {
2759
2760                                 start_ccb->ccb_h.flags |= CAM_DEV_QFREEZE;
2761                         }
2762
2763                         callout_reset(&dev->callout,
2764                             (crs->release_timeout * hz) / 1000,
2765                             xpt_release_devq_timeout, dev);
2766
2767                         dev->flags |= CAM_DEV_REL_TIMEOUT_PENDING;
2768
2769                 }
2770
2771                 if ((crs->release_flags & RELSIM_RELEASE_AFTER_CMDCMPLT) != 0) {
2772
2773                         if ((dev->flags & CAM_DEV_REL_ON_COMPLETE) != 0) {
2774                                 /*
2775                                  * Decrement the freeze count so that a single
2776                                  * completion is still sufficient to unfreeze
2777                                  * the queue.
2778                                  */
2779                                 start_ccb->ccb_h.flags &= ~CAM_DEV_QFREEZE;
2780                         } else {
2781
2782                                 dev->flags |= CAM_DEV_REL_ON_COMPLETE;
2783                                 start_ccb->ccb_h.flags |= CAM_DEV_QFREEZE;
2784                         }
2785                 }
2786
2787                 if ((crs->release_flags & RELSIM_RELEASE_AFTER_QEMPTY) != 0) {
2788
2789                         if ((dev->flags & CAM_DEV_REL_ON_QUEUE_EMPTY) != 0
2790                          || (dev->ccbq.dev_active == 0)) {
2791
2792                                 start_ccb->ccb_h.flags &= ~CAM_DEV_QFREEZE;
2793                         } else {
2794
2795                                 dev->flags |= CAM_DEV_REL_ON_QUEUE_EMPTY;
2796                                 start_ccb->ccb_h.flags |= CAM_DEV_QFREEZE;
2797                         }
2798                 }
2799
2800                 if ((start_ccb->ccb_h.flags & CAM_DEV_QFREEZE) == 0) {
2801                         xpt_release_devq_rl(path, /*runlevel*/
2802                             (crs->release_flags & RELSIM_RELEASE_RUNLEVEL) ?
2803                                 crs->release_timeout : 0,
2804                             /*count*/1, /*run_queue*/TRUE);
2805                 }
2806                 start_ccb->crs.qfrozen_cnt = dev->ccbq.queue.qfrozen_cnt[0];
2807                 start_ccb->ccb_h.status = CAM_REQ_CMP;
2808                 break;
2809         }
2810         case XPT_DEBUG: {
2811 #ifdef CAMDEBUG
2812 #ifdef CAM_DEBUG_DELAY
2813                 cam_debug_delay = CAM_DEBUG_DELAY;
2814 #endif
2815                 cam_dflags = start_ccb->cdbg.flags;
2816                 if (cam_dpath != NULL) {
2817                         xpt_free_path(cam_dpath);
2818                         cam_dpath = NULL;
2819                 }
2820
2821                 if (cam_dflags != CAM_DEBUG_NONE) {
2822                         if (xpt_create_path(&cam_dpath, xpt_periph,
2823                                             start_ccb->ccb_h.path_id,
2824                                             start_ccb->ccb_h.target_id,
2825                                             start_ccb->ccb_h.target_lun) !=
2826                                             CAM_REQ_CMP) {
2827                                 start_ccb->ccb_h.status = CAM_RESRC_UNAVAIL;
2828                                 cam_dflags = CAM_DEBUG_NONE;
2829                         } else {
2830                                 start_ccb->ccb_h.status = CAM_REQ_CMP;
2831                                 xpt_print(cam_dpath, "debugging flags now %x\n",
2832                                     cam_dflags);
2833                         }
2834                 } else {
2835                         cam_dpath = NULL;
2836                         start_ccb->ccb_h.status = CAM_REQ_CMP;
2837                 }
2838 #else /* !CAMDEBUG */
2839                 start_ccb->ccb_h.status = CAM_FUNC_NOTAVAIL;
2840 #endif /* CAMDEBUG */
2841                 break;
2842         }
2843         case XPT_FREEZE_QUEUE:
2844         {
2845                 struct ccb_relsim *crs = &start_ccb->crs;
2846
2847                 xpt_freeze_devq_rl(path, /*runlevel*/
2848                     (crs->release_flags & RELSIM_RELEASE_RUNLEVEL) ?
2849                     crs->release_timeout : 0, /*count*/1);
2850                 start_ccb->ccb_h.status = CAM_REQ_CMP;
2851                 break;
2852         }
2853         case XPT_NOOP:
2854                 if ((start_ccb->ccb_h.flags & CAM_DEV_QFREEZE) != 0)
2855                         xpt_freeze_devq(path, 1);
2856                 start_ccb->ccb_h.status = CAM_REQ_CMP;
2857                 break;
2858         default:
2859         case XPT_SDEV_TYPE:
2860         case XPT_TERM_IO:
2861         case XPT_ENG_INQ:
2862                 /* XXX Implement */
2863                 start_ccb->ccb_h.status = CAM_PROVIDE_FAIL;
2864                 if (start_ccb->ccb_h.func_code & XPT_FC_DEV_QUEUED) {
2865                         xpt_done(start_ccb);
2866                 }
2867                 break;
2868         }
2869 }
2870
2871 void
2872 xpt_polled_action(union ccb *start_ccb)
2873 {
2874         u_int32_t timeout;
2875         struct    cam_sim *sim;
2876         struct    cam_devq *devq;
2877         struct    cam_ed *dev;
2878
2879
2880         timeout = start_ccb->ccb_h.timeout * 10;
2881         sim = start_ccb->ccb_h.path->bus->sim;
2882         devq = sim->devq;
2883         dev = start_ccb->ccb_h.path->device;
2884
2885         mtx_assert(sim->mtx, MA_OWNED);
2886
2887         /*
2888          * Steal an opening so that no other queued requests
2889          * can get it before us while we simulate interrupts.
2890          */
2891         dev->ccbq.devq_openings--;
2892         dev->ccbq.dev_openings--;
2893
2894         while(((devq != NULL && devq->send_openings <= 0) ||
2895            dev->ccbq.dev_openings < 0) && (--timeout > 0)) {
2896                 DELAY(100);
2897                 (*(sim->sim_poll))(sim);
2898                 camisr_runqueue(&sim->sim_doneq);
2899         }
2900
2901         dev->ccbq.devq_openings++;
2902         dev->ccbq.dev_openings++;
2903
2904         if (timeout != 0) {
2905                 xpt_action(start_ccb);
2906                 while(--timeout > 0) {
2907                         (*(sim->sim_poll))(sim);
2908                         camisr_runqueue(&sim->sim_doneq);
2909                         if ((start_ccb->ccb_h.status  & CAM_STATUS_MASK)
2910                             != CAM_REQ_INPROG)
2911                                 break;
2912                         DELAY(100);
2913                 }
2914                 if (timeout == 0) {
2915                         /*
2916                          * XXX Is it worth adding a sim_timeout entry
2917                          * point so we can attempt recovery?  If
2918                          * this is only used for dumps, I don't think
2919                          * it is.
2920                          */
2921                         start_ccb->ccb_h.status = CAM_CMD_TIMEOUT;
2922                 }
2923         } else {
2924                 start_ccb->ccb_h.status = CAM_RESRC_UNAVAIL;
2925         }
2926 }
2927
2928 /*
2929  * Schedule a peripheral driver to receive a ccb when it's
2930  * target device has space for more transactions.
2931  */
2932 void
2933 xpt_schedule(struct cam_periph *perph, u_int32_t new_priority)
2934 {
2935         struct cam_ed *device;
2936         int runq = 0;
2937
2938         mtx_assert(perph->sim->mtx, MA_OWNED);
2939
2940         CAM_DEBUG(perph->path, CAM_DEBUG_TRACE, ("xpt_schedule\n"));
2941         device = perph->path->device;
2942         if (periph_is_queued(perph)) {
2943                 /* Simply reorder based on new priority */
2944                 CAM_DEBUG(perph->path, CAM_DEBUG_SUBTRACE,
2945                           ("   change priority to %d\n", new_priority));
2946                 if (new_priority < perph->pinfo.priority) {
2947                         camq_change_priority(&device->drvq,
2948                                              perph->pinfo.index,
2949                                              new_priority);
2950                         runq = xpt_schedule_dev_allocq(perph->path->bus, device);
2951                 }
2952         } else {
2953                 /* New entry on the queue */
2954                 CAM_DEBUG(perph->path, CAM_DEBUG_SUBTRACE,
2955                           ("   added periph to queue\n"));
2956                 perph->pinfo.priority = new_priority;
2957                 perph->pinfo.generation = ++device->drvq.generation;
2958                 camq_insert(&device->drvq, &perph->pinfo);
2959                 runq = xpt_schedule_dev_allocq(perph->path->bus, device);
2960         }
2961         if (runq != 0) {
2962                 CAM_DEBUG(perph->path, CAM_DEBUG_SUBTRACE,
2963                           ("   calling xpt_run_devq\n"));
2964                 xpt_run_dev_allocq(perph->path->bus);
2965         }
2966 }
2967
2968
2969 /*
2970  * Schedule a device to run on a given queue.
2971  * If the device was inserted as a new entry on the queue,
2972  * return 1 meaning the device queue should be run. If we
2973  * were already queued, implying someone else has already
2974  * started the queue, return 0 so the caller doesn't attempt
2975  * to run the queue.
2976  */
2977 int
2978 xpt_schedule_dev(struct camq *queue, cam_pinfo *pinfo,
2979                  u_int32_t new_priority)
2980 {
2981         int retval;
2982         u_int32_t old_priority;
2983
2984         CAM_DEBUG_PRINT(CAM_DEBUG_XPT, ("xpt_schedule_dev\n"));
2985
2986         old_priority = pinfo->priority;
2987
2988         /*
2989          * Are we already queued?
2990          */
2991         if (pinfo->index != CAM_UNQUEUED_INDEX) {
2992                 /* Simply reorder based on new priority */
2993                 if (new_priority < old_priority) {
2994                         camq_change_priority(queue, pinfo->index,
2995                                              new_priority);
2996                         CAM_DEBUG_PRINT(CAM_DEBUG_XPT,
2997                                         ("changed priority to %d\n",
2998                                          new_priority));
2999                         retval = 1;
3000                 } else
3001                         retval = 0;
3002         } else {
3003                 /* New entry on the queue */
3004                 if (new_priority < old_priority)
3005                         pinfo->priority = new_priority;
3006
3007                 CAM_DEBUG_PRINT(CAM_DEBUG_XPT,
3008                                 ("Inserting onto queue\n"));
3009                 pinfo->generation = ++queue->generation;
3010                 camq_insert(queue, pinfo);
3011                 retval = 1;
3012         }
3013         return (retval);
3014 }
3015
3016 static void
3017 xpt_run_dev_allocq(struct cam_eb *bus)
3018 {
3019         struct  cam_devq *devq;
3020
3021         CAM_DEBUG_PRINT(CAM_DEBUG_XPT, ("xpt_run_dev_allocq\n"));
3022         devq = bus->sim->devq;
3023
3024         CAM_DEBUG_PRINT(CAM_DEBUG_XPT,
3025                         ("   qfrozen_cnt == 0x%x, entries == %d, "
3026                          "openings == %d, active == %d\n",
3027                          devq->alloc_queue.qfrozen_cnt[0],
3028                          devq->alloc_queue.entries,
3029                          devq->alloc_openings,
3030                          devq->alloc_active));
3031
3032         devq->alloc_queue.qfrozen_cnt[0]++;
3033         while ((devq->alloc_queue.entries > 0)
3034             && (devq->alloc_openings > 0)
3035             && (devq->alloc_queue.qfrozen_cnt[0] <= 1)) {
3036                 struct  cam_ed_qinfo *qinfo;
3037                 struct  cam_ed *device;
3038                 union   ccb *work_ccb;
3039                 struct  cam_periph *drv;
3040                 struct  camq *drvq;
3041
3042                 qinfo = (struct cam_ed_qinfo *)camq_remove(&devq->alloc_queue,
3043                                                            CAMQ_HEAD);
3044                 device = qinfo->device;
3045                 CAM_DEBUG_PRINT(CAM_DEBUG_XPT,
3046                                 ("running device %p\n", device));
3047
3048                 drvq = &device->drvq;
3049
3050 #ifdef CAMDEBUG
3051                 if (drvq->entries <= 0) {
3052                         panic("xpt_run_dev_allocq: "
3053                               "Device on queue without any work to do");
3054                 }
3055 #endif
3056                 if ((work_ccb = xpt_get_ccb(device)) != NULL) {
3057                         devq->alloc_openings--;
3058                         devq->alloc_active++;
3059                         drv = (struct cam_periph*)camq_remove(drvq, CAMQ_HEAD);
3060                         xpt_setup_ccb(&work_ccb->ccb_h, drv->path,
3061                                       drv->pinfo.priority);
3062                         CAM_DEBUG_PRINT(CAM_DEBUG_XPT,
3063                                         ("calling periph start\n"));
3064                         drv->periph_start(drv, work_ccb);
3065                 } else {
3066                         /*
3067                          * Malloc failure in alloc_ccb
3068                          */
3069                         /*
3070                          * XXX add us to a list to be run from free_ccb
3071                          * if we don't have any ccbs active on this
3072                          * device queue otherwise we may never get run
3073                          * again.
3074                          */
3075                         break;
3076                 }
3077
3078                 /* We may have more work. Attempt to reschedule. */
3079                 xpt_schedule_dev_allocq(bus, device);
3080         }
3081         devq->alloc_queue.qfrozen_cnt[0]--;
3082 }
3083
3084 static void
3085 xpt_run_dev_sendq(struct cam_eb *bus)
3086 {
3087         struct  cam_devq *devq;
3088
3089         CAM_DEBUG_PRINT(CAM_DEBUG_XPT, ("xpt_run_dev_sendq\n"));
3090
3091         devq = bus->sim->devq;
3092
3093         devq->send_queue.qfrozen_cnt[0]++;
3094         while ((devq->send_queue.entries > 0)
3095             && (devq->send_openings > 0)
3096             && (devq->send_queue.qfrozen_cnt[0] <= 1)) {
3097                 struct  cam_ed_qinfo *qinfo;
3098                 struct  cam_ed *device;
3099                 union ccb *work_ccb;
3100                 struct  cam_sim *sim;
3101
3102                 qinfo = (struct cam_ed_qinfo *)camq_remove(&devq->send_queue,
3103                                                            CAMQ_HEAD);
3104                 device = qinfo->device;
3105                 CAM_DEBUG_PRINT(CAM_DEBUG_XPT,
3106                                 ("running device %p\n", device));
3107
3108                 work_ccb = cam_ccbq_peek_ccb(&device->ccbq, CAMQ_HEAD);
3109                 if (work_ccb == NULL) {
3110                         printf("device on run queue with no ccbs???\n");
3111                         continue;
3112                 }
3113
3114                 if ((work_ccb->ccb_h.flags & CAM_HIGH_POWER) != 0) {
3115
3116                         mtx_lock(&xsoftc.xpt_lock);
3117                         if (xsoftc.num_highpower <= 0) {
3118                                 /*
3119                                  * We got a high power command, but we
3120                                  * don't have any available slots.  Freeze
3121                                  * the device queue until we have a slot
3122                                  * available.
3123                                  */
3124                                 xpt_freeze_devq(work_ccb->ccb_h.path, 1);
3125                                 STAILQ_INSERT_TAIL(&xsoftc.highpowerq,
3126                                                    &work_ccb->ccb_h,
3127                                                    xpt_links.stqe);
3128
3129                                 mtx_unlock(&xsoftc.xpt_lock);
3130                                 continue;
3131                         } else {
3132                                 /*
3133                                  * Consume a high power slot while
3134                                  * this ccb runs.
3135                                  */
3136                                 xsoftc.num_highpower--;
3137                         }
3138                         mtx_unlock(&xsoftc.xpt_lock);
3139                 }
3140                 cam_ccbq_remove_ccb(&device->ccbq, work_ccb);
3141                 cam_ccbq_send_ccb(&device->ccbq, work_ccb);
3142
3143                 devq->send_openings--;
3144                 devq->send_active++;
3145
3146                 xpt_schedule_dev_sendq(bus, device);
3147
3148                 if (work_ccb && (work_ccb->ccb_h.flags & CAM_DEV_QFREEZE) != 0){
3149                         /*
3150                          * The client wants to freeze the queue
3151                          * after this CCB is sent.
3152                          */
3153                         xpt_freeze_devq(work_ccb->ccb_h.path, 1);
3154                 }
3155
3156                 /* In Target mode, the peripheral driver knows best... */
3157                 if (work_ccb->ccb_h.func_code == XPT_SCSI_IO) {
3158                         if ((device->inq_flags & SID_CmdQue) != 0
3159                          && work_ccb->csio.tag_action != CAM_TAG_ACTION_NONE)
3160                                 work_ccb->ccb_h.flags |= CAM_TAG_ACTION_VALID;
3161                         else
3162                                 /*
3163                                  * Clear this in case of a retried CCB that
3164                                  * failed due to a rejected tag.
3165                                  */
3166                                 work_ccb->ccb_h.flags &= ~CAM_TAG_ACTION_VALID;
3167                 }
3168
3169                 /*
3170                  * Device queues can be shared among multiple sim instances
3171                  * that reside on different busses.  Use the SIM in the queue
3172                  * CCB's path, rather than the one in the bus that was passed
3173                  * into this function.
3174                  */
3175                 sim = work_ccb->ccb_h.path->bus->sim;
3176                 (*(sim->sim_action))(sim, work_ccb);
3177         }
3178         devq->send_queue.qfrozen_cnt[0]--;
3179 }
3180
3181 /*
3182  * This function merges stuff from the slave ccb into the master ccb, while
3183  * keeping important fields in the master ccb constant.
3184  */
3185 void
3186 xpt_merge_ccb(union ccb *master_ccb, union ccb *slave_ccb)
3187 {
3188
3189         /*
3190          * Pull fields that are valid for peripheral drivers to set
3191          * into the master CCB along with the CCB "payload".
3192          */
3193         master_ccb->ccb_h.retry_count = slave_ccb->ccb_h.retry_count;
3194         master_ccb->ccb_h.func_code = slave_ccb->ccb_h.func_code;
3195         master_ccb->ccb_h.timeout = slave_ccb->ccb_h.timeout;
3196         master_ccb->ccb_h.flags = slave_ccb->ccb_h.flags;
3197         bcopy(&(&slave_ccb->ccb_h)[1], &(&master_ccb->ccb_h)[1],
3198               sizeof(union ccb) - sizeof(struct ccb_hdr));
3199 }
3200
3201 void
3202 xpt_setup_ccb(struct ccb_hdr *ccb_h, struct cam_path *path, u_int32_t priority)
3203 {
3204
3205         CAM_DEBUG(path, CAM_DEBUG_TRACE, ("xpt_setup_ccb\n"));
3206         ccb_h->pinfo.priority = priority;
3207         ccb_h->path = path;
3208         ccb_h->path_id = path->bus->path_id;
3209         if (path->target)
3210                 ccb_h->target_id = path->target->target_id;
3211         else
3212                 ccb_h->target_id = CAM_TARGET_WILDCARD;
3213         if (path->device) {
3214                 ccb_h->target_lun = path->device->lun_id;
3215                 ccb_h->pinfo.generation = ++path->device->ccbq.queue.generation;
3216         } else {
3217                 ccb_h->target_lun = CAM_TARGET_WILDCARD;
3218         }
3219         ccb_h->pinfo.index = CAM_UNQUEUED_INDEX;
3220         ccb_h->flags = 0;
3221 }
3222
3223 /* Path manipulation functions */
3224 cam_status
3225 xpt_create_path(struct cam_path **new_path_ptr, struct cam_periph *perph,
3226                 path_id_t path_id, target_id_t target_id, lun_id_t lun_id)
3227 {
3228         struct     cam_path *path;
3229         cam_status status;
3230
3231         path = (struct cam_path *)malloc(sizeof(*path), M_CAMXPT, M_NOWAIT);
3232
3233         if (path == NULL) {
3234                 status = CAM_RESRC_UNAVAIL;
3235                 return(status);
3236         }
3237         status = xpt_compile_path(path, perph, path_id, target_id, lun_id);
3238         if (status != CAM_REQ_CMP) {
3239                 free(path, M_CAMXPT);
3240                 path = NULL;
3241         }
3242         *new_path_ptr = path;
3243         return (status);
3244 }
3245
3246 cam_status
3247 xpt_create_path_unlocked(struct cam_path **new_path_ptr,
3248                          struct cam_periph *periph, path_id_t path_id,
3249                          target_id_t target_id, lun_id_t lun_id)
3250 {
3251         struct     cam_path *path;
3252         struct     cam_eb *bus = NULL;
3253         cam_status status;
3254         int        need_unlock = 0;
3255
3256         path = (struct cam_path *)malloc(sizeof(*path), M_CAMXPT, M_WAITOK);
3257
3258         if (path_id != CAM_BUS_WILDCARD) {
3259                 bus = xpt_find_bus(path_id);
3260                 if (bus != NULL) {
3261                         need_unlock = 1;
3262                         CAM_SIM_LOCK(bus->sim);
3263                 }
3264         }
3265         status = xpt_compile_path(path, periph, path_id, target_id, lun_id);
3266         if (need_unlock)
3267                 CAM_SIM_UNLOCK(bus->sim);
3268         if (status != CAM_REQ_CMP) {
3269                 free(path, M_CAMXPT);
3270                 path = NULL;
3271         }
3272         *new_path_ptr = path;
3273         return (status);
3274 }
3275
3276 cam_status
3277 xpt_compile_path(struct cam_path *new_path, struct cam_periph *perph,
3278                  path_id_t path_id, target_id_t target_id, lun_id_t lun_id)
3279 {
3280         struct       cam_eb *bus;
3281         struct       cam_et *target;
3282         struct       cam_ed *device;
3283         cam_status   status;
3284
3285         status = CAM_REQ_CMP;   /* Completed without error */
3286         target = NULL;          /* Wildcarded */
3287         device = NULL;          /* Wildcarded */
3288
3289         /*
3290          * We will potentially modify the EDT, so block interrupts
3291          * that may attempt to create cam paths.
3292          */
3293         bus = xpt_find_bus(path_id);
3294         if (bus == NULL) {
3295                 status = CAM_PATH_INVALID;
3296         } else {
3297                 target = xpt_find_target(bus, target_id);
3298                 if (target == NULL) {
3299                         /* Create one */
3300                         struct cam_et *new_target;
3301
3302                         new_target = xpt_alloc_target(bus, target_id);
3303                         if (new_target == NULL) {
3304                                 status = CAM_RESRC_UNAVAIL;
3305                         } else {
3306                                 target = new_target;
3307                         }
3308                 }
3309                 if (target != NULL) {
3310                         device = xpt_find_device(target, lun_id);
3311                         if (device == NULL) {
3312                                 /* Create one */
3313                                 struct cam_ed *new_device;
3314
3315                                 new_device =
3316                                     (*(bus->xport->alloc_device))(bus,
3317                                                                       target,
3318                                                                       lun_id);
3319                                 if (new_device == NULL) {
3320                                         status = CAM_RESRC_UNAVAIL;
3321                                 } else {
3322                                         device = new_device;
3323                                 }
3324                         }
3325                 }
3326         }
3327
3328         /*
3329          * Only touch the user's data if we are successful.
3330          */
3331         if (status == CAM_REQ_CMP) {
3332                 new_path->periph = perph;
3333                 new_path->bus = bus;
3334                 new_path->target = target;
3335                 new_path->device = device;
3336                 CAM_DEBUG(new_path, CAM_DEBUG_TRACE, ("xpt_compile_path\n"));
3337         } else {
3338                 if (device != NULL)
3339                         xpt_release_device(device);
3340                 if (target != NULL)
3341                         xpt_release_target(target);
3342                 if (bus != NULL)
3343                         xpt_release_bus(bus);
3344         }
3345         return (status);
3346 }
3347
3348 void
3349 xpt_release_path(struct cam_path *path)
3350 {
3351         CAM_DEBUG(path, CAM_DEBUG_TRACE, ("xpt_release_path\n"));
3352         if (path->device != NULL) {
3353                 xpt_release_device(path->device);
3354                 path->device = NULL;
3355         }
3356         if (path->target != NULL) {
3357                 xpt_release_target(path->target);
3358                 path->target = NULL;
3359         }
3360         if (path->bus != NULL) {
3361                 xpt_release_bus(path->bus);
3362                 path->bus = NULL;
3363         }
3364 }
3365
3366 void
3367 xpt_free_path(struct cam_path *path)
3368 {
3369
3370         CAM_DEBUG(path, CAM_DEBUG_TRACE, ("xpt_free_path\n"));
3371         xpt_release_path(path);
3372         free(path, M_CAMXPT);
3373 }
3374
3375
3376 /*
3377  * Return -1 for failure, 0 for exact match, 1 for match with wildcards
3378  * in path1, 2 for match with wildcards in path2.
3379  */
3380 int
3381 xpt_path_comp(struct cam_path *path1, struct cam_path *path2)
3382 {
3383         int retval = 0;
3384
3385         if (path1->bus != path2->bus) {
3386                 if (path1->bus->path_id == CAM_BUS_WILDCARD)
3387                         retval = 1;
3388                 else if (path2->bus->path_id == CAM_BUS_WILDCARD)
3389                         retval = 2;
3390                 else
3391                         return (-1);
3392         }
3393         if (path1->target != path2->target) {
3394                 if (path1->target->target_id == CAM_TARGET_WILDCARD) {
3395                         if (retval == 0)
3396                                 retval = 1;
3397                 } else if (path2->target->target_id == CAM_TARGET_WILDCARD)
3398                         retval = 2;
3399                 else
3400                         return (-1);
3401         }
3402         if (path1->device != path2->device) {
3403                 if (path1->device->lun_id == CAM_LUN_WILDCARD) {
3404                         if (retval == 0)
3405                                 retval = 1;
3406                 } else if (path2->device->lun_id == CAM_LUN_WILDCARD)
3407                         retval = 2;
3408                 else
3409                         return (-1);
3410         }
3411         return (retval);
3412 }
3413
3414 void
3415 xpt_print_path(struct cam_path *path)
3416 {
3417
3418         if (path == NULL)
3419                 printf("(nopath): ");
3420         else {
3421                 if (path->periph != NULL)
3422                         printf("(%s%d:", path->periph->periph_name,
3423                                path->periph->unit_number);
3424                 else
3425                         printf("(noperiph:");
3426
3427                 if (path->bus != NULL)
3428                         printf("%s%d:%d:", path->bus->sim->sim_name,
3429                                path->bus->sim->unit_number,
3430                                path->bus->sim->bus_id);
3431                 else
3432                         printf("nobus:");
3433
3434                 if (path->target != NULL)
3435                         printf("%d:", path->target->target_id);
3436                 else
3437                         printf("X:");
3438
3439                 if (path->device != NULL)
3440                         printf("%d): ", path->device->lun_id);
3441                 else
3442                         printf("X): ");
3443         }
3444 }
3445
3446 void
3447 xpt_print(struct cam_path *path, const char *fmt, ...)
3448 {
3449         va_list ap;
3450         xpt_print_path(path);
3451         va_start(ap, fmt);
3452         vprintf(fmt, ap);
3453         va_end(ap);
3454 }
3455
3456 int
3457 xpt_path_string(struct cam_path *path, char *str, size_t str_len)
3458 {
3459         struct sbuf sb;
3460
3461 #ifdef INVARIANTS
3462         if (path != NULL && path->bus != NULL)
3463                 mtx_assert(path->bus->sim->mtx, MA_OWNED);
3464 #endif
3465
3466         sbuf_new(&sb, str, str_len, 0);
3467
3468         if (path == NULL)
3469                 sbuf_printf(&sb, "(nopath): ");
3470         else {
3471                 if (path->periph != NULL)
3472                         sbuf_printf(&sb, "(%s%d:", path->periph->periph_name,
3473                                     path->periph->unit_number);
3474                 else
3475                         sbuf_printf(&sb, "(noperiph:");
3476
3477                 if (path->bus != NULL)
3478                         sbuf_printf(&sb, "%s%d:%d:", path->bus->sim->sim_name,
3479                                     path->bus->sim->unit_number,
3480                                     path->bus->sim->bus_id);
3481                 else
3482                         sbuf_printf(&sb, "nobus:");
3483
3484                 if (path->target != NULL)
3485                         sbuf_printf(&sb, "%d:", path->target->target_id);
3486                 else
3487                         sbuf_printf(&sb, "X:");
3488
3489                 if (path->device != NULL)
3490                         sbuf_printf(&sb, "%d): ", path->device->lun_id);
3491                 else
3492                         sbuf_printf(&sb, "X): ");
3493         }
3494         sbuf_finish(&sb);
3495
3496         return(sbuf_len(&sb));
3497 }
3498
3499 path_id_t
3500 xpt_path_path_id(struct cam_path *path)
3501 {
3502         mtx_assert(path->bus->sim->mtx, MA_OWNED);
3503
3504         return(path->bus->path_id);
3505 }
3506
3507 target_id_t
3508 xpt_path_target_id(struct cam_path *path)
3509 {
3510         mtx_assert(path->bus->sim->mtx, MA_OWNED);
3511
3512         if (path->target != NULL)
3513                 return (path->target->target_id);
3514         else
3515                 return (CAM_TARGET_WILDCARD);
3516 }
3517
3518 lun_id_t
3519 xpt_path_lun_id(struct cam_path *path)
3520 {
3521         mtx_assert(path->bus->sim->mtx, MA_OWNED);
3522
3523         if (path->device != NULL)
3524                 return (path->device->lun_id);
3525         else
3526                 return (CAM_LUN_WILDCARD);
3527 }
3528
3529 struct cam_sim *
3530 xpt_path_sim(struct cam_path *path)
3531 {
3532
3533         return (path->bus->sim);
3534 }
3535
3536 struct cam_periph*
3537 xpt_path_periph(struct cam_path *path)
3538 {
3539         mtx_assert(path->bus->sim->mtx, MA_OWNED);
3540
3541         return (path->periph);
3542 }
3543
3544 /*
3545  * Release a CAM control block for the caller.  Remit the cost of the structure
3546  * to the device referenced by the path.  If the this device had no 'credits'
3547  * and peripheral drivers have registered async callbacks for this notification
3548  * call them now.
3549  */
3550 void
3551 xpt_release_ccb(union ccb *free_ccb)
3552 {
3553         struct   cam_path *path;
3554         struct   cam_ed *device;
3555         struct   cam_eb *bus;
3556         struct   cam_sim *sim;
3557
3558         CAM_DEBUG_PRINT(CAM_DEBUG_XPT, ("xpt_release_ccb\n"));
3559         path = free_ccb->ccb_h.path;
3560         device = path->device;
3561         bus = path->bus;
3562         sim = bus->sim;
3563
3564         mtx_assert(sim->mtx, MA_OWNED);
3565
3566         cam_ccbq_release_opening(&device->ccbq);
3567         if (device->flags & CAM_DEV_RESIZE_QUEUE_NEEDED) {
3568                 device->flags &= ~CAM_DEV_RESIZE_QUEUE_NEEDED;
3569                 cam_ccbq_resize(&device->ccbq,
3570                     device->ccbq.dev_openings + device->ccbq.dev_active);
3571         }
3572         if (sim->ccb_count > sim->max_ccbs) {
3573                 xpt_free_ccb(free_ccb);
3574                 sim->ccb_count--;
3575         } else {
3576                 SLIST_INSERT_HEAD(&sim->ccb_freeq, &free_ccb->ccb_h,
3577                     xpt_links.sle);
3578         }
3579         if (sim->devq == NULL) {
3580                 return;
3581         }
3582         sim->devq->alloc_openings++;
3583         sim->devq->alloc_active--;
3584         if (device_is_alloc_queued(device) == 0)
3585                 xpt_schedule_dev_allocq(bus, device);
3586         xpt_run_dev_allocq(bus);
3587 }
3588
3589 /* Functions accessed by SIM drivers */
3590
3591 static struct xpt_xport xport_default = {
3592         .alloc_device = xpt_alloc_device_default,
3593         .action = xpt_action_default,
3594         .async = xpt_dev_async_default,
3595 };
3596
3597 /*
3598  * A sim structure, listing the SIM entry points and instance
3599  * identification info is passed to xpt_bus_register to hook the SIM
3600  * into the CAM framework.  xpt_bus_register creates a cam_eb entry
3601  * for this new bus and places it in the array of busses and assigns
3602  * it a path_id.  The path_id may be influenced by "hard wiring"
3603  * information specified by the user.  Once interrupt services are
3604  * available, the bus will be probed.
3605  */
3606 int32_t
3607 xpt_bus_register(struct cam_sim *sim, device_t parent, u_int32_t bus)
3608 {
3609         struct cam_eb *new_bus;
3610         struct cam_eb *old_bus;
3611         struct ccb_pathinq cpi;
3612         struct cam_path *path;
3613         cam_status status;
3614
3615         mtx_assert(sim->mtx, MA_OWNED);
3616
3617         sim->bus_id = bus;
3618         new_bus = (struct cam_eb *)malloc(sizeof(*new_bus),
3619                                           M_CAMXPT, M_NOWAIT);
3620         if (new_bus == NULL) {
3621                 /* Couldn't satisfy request */
3622                 return (CAM_RESRC_UNAVAIL);
3623         }
3624         path = (struct cam_path *)malloc(sizeof(*path), M_CAMXPT, M_NOWAIT);
3625         if (path == NULL) {
3626                 free(new_bus, M_CAMXPT);
3627                 return (CAM_RESRC_UNAVAIL);
3628         }
3629
3630         if (strcmp(sim->sim_name, "xpt") != 0) {
3631                 sim->path_id =
3632                     xptpathid(sim->sim_name, sim->unit_number, sim->bus_id);
3633         }
3634
3635         TAILQ_INIT(&new_bus->et_entries);
3636         new_bus->path_id = sim->path_id;
3637         cam_sim_hold(sim);
3638         new_bus->sim = sim;
3639         timevalclear(&new_bus->last_reset);
3640         new_bus->flags = 0;
3641         new_bus->refcount = 1;  /* Held until a bus_deregister event */
3642         new_bus->generation = 0;
3643
3644         mtx_lock(&xsoftc.xpt_topo_lock);
3645         old_bus = TAILQ_FIRST(&xsoftc.xpt_busses);
3646         while (old_bus != NULL
3647             && old_bus->path_id < new_bus->path_id)
3648                 old_bus = TAILQ_NEXT(old_bus, links);
3649         if (old_bus != NULL)
3650                 TAILQ_INSERT_BEFORE(old_bus, new_bus, links);
3651         else
3652                 TAILQ_INSERT_TAIL(&xsoftc.xpt_busses, new_bus, links);
3653         xsoftc.bus_generation++;
3654         mtx_unlock(&xsoftc.xpt_topo_lock);
3655
3656         /*
3657          * Set a default transport so that a PATH_INQ can be issued to
3658          * the SIM.  This will then allow for probing and attaching of
3659          * a more appropriate transport.
3660          */
3661         new_bus->xport = &xport_default;
3662
3663         status = xpt_compile_path(path, /*periph*/NULL, sim->path_id,
3664                                   CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD);
3665         if (status != CAM_REQ_CMP)
3666                 printf("xpt_compile_path returned %d\n", status);
3667
3668         xpt_setup_ccb(&cpi.ccb_h, path, CAM_PRIORITY_NORMAL);
3669         cpi.ccb_h.func_code = XPT_PATH_INQ;
3670         xpt_action((union ccb *)&cpi);
3671
3672         if (cpi.ccb_h.status == CAM_REQ_CMP) {
3673                 switch (cpi.transport) {
3674                 case XPORT_SPI:
3675                 case XPORT_SAS:
3676                 case XPORT_FC:
3677                 case XPORT_USB:
3678                 case XPORT_ISCSI:
3679                 case XPORT_PPB:
3680                         new_bus->xport = scsi_get_xport();
3681                         break;
3682                 case XPORT_ATA:
3683                 case XPORT_SATA:
3684                         new_bus->xport = ata_get_xport();
3685                         break;
3686                 default:
3687                         new_bus->xport = &xport_default;
3688                         break;
3689                 }
3690         }
3691
3692         /* Notify interested parties */
3693         if (sim->path_id != CAM_XPT_PATH_ID) {
3694                 union   ccb *scan_ccb;
3695
3696                 xpt_async(AC_PATH_REGISTERED, path, &cpi);
3697                 /* Initiate bus rescan. */
3698                 scan_ccb = xpt_alloc_ccb_nowait();
3699                 scan_ccb->ccb_h.path = path;
3700                 scan_ccb->ccb_h.func_code = XPT_SCAN_BUS;
3701                 scan_ccb->crcn.flags = 0;
3702                 xpt_rescan(scan_ccb);
3703         } else
3704                 xpt_free_path(path);
3705         return (CAM_SUCCESS);
3706 }
3707
3708 int32_t
3709 xpt_bus_deregister(path_id_t pathid)
3710 {
3711         struct cam_path bus_path;
3712         cam_status status;
3713
3714         status = xpt_compile_path(&bus_path, NULL, pathid,
3715                                   CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD);
3716         if (status != CAM_REQ_CMP)
3717                 return (status);
3718
3719         xpt_async(AC_LOST_DEVICE, &bus_path, NULL);
3720         xpt_async(AC_PATH_DEREGISTERED, &bus_path, NULL);
3721
3722         /* Release the reference count held while registered. */
3723         xpt_release_bus(bus_path.bus);
3724         xpt_release_path(&bus_path);
3725
3726         return (CAM_REQ_CMP);
3727 }
3728
3729 static path_id_t
3730 xptnextfreepathid(void)
3731 {
3732         struct cam_eb *bus;
3733         path_id_t pathid;
3734         const char *strval;
3735
3736         pathid = 0;
3737         mtx_lock(&xsoftc.xpt_topo_lock);
3738         bus = TAILQ_FIRST(&xsoftc.xpt_busses);
3739 retry:
3740         /* Find an unoccupied pathid */
3741         while (bus != NULL && bus->path_id <= pathid) {
3742                 if (bus->path_id == pathid)
3743                         pathid++;
3744                 bus = TAILQ_NEXT(bus, links);
3745         }
3746         mtx_unlock(&xsoftc.xpt_topo_lock);
3747
3748         /*
3749          * Ensure that this pathid is not reserved for
3750          * a bus that may be registered in the future.
3751          */
3752         if (resource_string_value("scbus", pathid, "at", &strval) == 0) {
3753                 ++pathid;
3754                 /* Start the search over */
3755                 mtx_lock(&xsoftc.xpt_topo_lock);
3756                 goto retry;
3757         }
3758         return (pathid);
3759 }
3760
3761 static path_id_t
3762 xptpathid(const char *sim_name, int sim_unit, int sim_bus)
3763 {
3764         path_id_t pathid;
3765         int i, dunit, val;
3766         char buf[32];
3767         const char *dname;
3768
3769         pathid = CAM_XPT_PATH_ID;
3770         snprintf(buf, sizeof(buf), "%s%d", sim_name, sim_unit);
3771         i = 0;
3772         while ((resource_find_match(&i, &dname, &dunit, "at", buf)) == 0) {
3773                 if (strcmp(dname, "scbus")) {
3774                         /* Avoid a bit of foot shooting. */
3775                         continue;
3776                 }
3777                 if (dunit < 0)          /* unwired?! */
3778                         continue;
3779                 if (resource_int_value("scbus", dunit, "bus", &val) == 0) {
3780                         if (sim_bus == val) {
3781                                 pathid = dunit;
3782                                 break;
3783                         }
3784                 } else if (sim_bus == 0) {
3785                         /* Unspecified matches bus 0 */
3786                         pathid = dunit;
3787                         break;
3788                 } else {
3789                         printf("Ambiguous scbus configuration for %s%d "
3790                                "bus %d, cannot wire down.  The kernel "
3791                                "config entry for scbus%d should "
3792                                "specify a controller bus.\n"
3793                                "Scbus will be assigned dynamically.\n",
3794                                sim_name, sim_unit, sim_bus, dunit);
3795                         break;
3796                 }
3797         }
3798
3799         if (pathid == CAM_XPT_PATH_ID)
3800                 pathid = xptnextfreepathid();
3801         return (pathid);
3802 }
3803
3804 void
3805 xpt_async(u_int32_t async_code, struct cam_path *path, void *async_arg)
3806 {
3807         struct cam_eb *bus;
3808         struct cam_et *target, *next_target;
3809         struct cam_ed *device, *next_device;
3810
3811         mtx_assert(path->bus->sim->mtx, MA_OWNED);
3812
3813         CAM_DEBUG(path, CAM_DEBUG_TRACE, ("xpt_async\n"));
3814
3815         /*
3816          * Most async events come from a CAM interrupt context.  In
3817          * a few cases, the error recovery code at the peripheral layer,
3818          * which may run from our SWI or a process context, may signal
3819          * deferred events with a call to xpt_async.
3820          */
3821
3822         bus = path->bus;
3823
3824         if (async_code == AC_BUS_RESET) {
3825                 /* Update our notion of when the last reset occurred */
3826                 microtime(&bus->last_reset);
3827         }
3828
3829         for (target = TAILQ_FIRST(&bus->et_entries);
3830              target != NULL;
3831              target = next_target) {
3832
3833                 next_target = TAILQ_NEXT(target, links);
3834
3835                 if (path->target != target
3836                  && path->target->target_id != CAM_TARGET_WILDCARD
3837                  && target->target_id != CAM_TARGET_WILDCARD)
3838                         continue;
3839
3840                 if (async_code == AC_SENT_BDR) {
3841                         /* Update our notion of when the last reset occurred */
3842                         microtime(&path->target->last_reset);
3843                 }
3844
3845                 for (device = TAILQ_FIRST(&target->ed_entries);
3846                      device != NULL;
3847                      device = next_device) {
3848
3849                         next_device = TAILQ_NEXT(device, links);
3850
3851                         if (path->device != device
3852                          && path->device->lun_id != CAM_LUN_WILDCARD
3853                          && device->lun_id != CAM_LUN_WILDCARD)
3854                                 continue;
3855                         /*
3856                          * The async callback could free the device.
3857                          * If it is a broadcast async, it doesn't hold
3858                          * device reference, so take our own reference.
3859                          */
3860                         xpt_acquire_device(device);
3861                         (*(bus->xport->async))(async_code, bus,
3862                                                target, device,
3863                                                async_arg);
3864
3865                         xpt_async_bcast(&device->asyncs, async_code,
3866                                         path, async_arg);
3867                         xpt_release_device(device);
3868                 }
3869         }
3870
3871         /*
3872          * If this wasn't a fully wildcarded async, tell all
3873          * clients that want all async events.
3874          */
3875         if (bus != xpt_periph->path->bus)
3876                 xpt_async_bcast(&xpt_periph->path->device->asyncs, async_code,
3877                                 path, async_arg);
3878 }
3879
3880 static void
3881 xpt_async_bcast(struct async_list *async_head,
3882                 u_int32_t async_code,
3883                 struct cam_path *path, void *async_arg)
3884 {
3885         struct async_node *cur_entry;
3886
3887         cur_entry = SLIST_FIRST(async_head);
3888         while (cur_entry != NULL) {
3889                 struct async_node *next_entry;
3890                 /*
3891                  * Grab the next list entry before we call the current
3892                  * entry's callback.  This is because the callback function
3893                  * can delete its async callback entry.
3894                  */
3895                 next_entry = SLIST_NEXT(cur_entry, links);
3896                 if ((cur_entry->event_enable & async_code) != 0)
3897                         cur_entry->callback(cur_entry->callback_arg,
3898                                             async_code, path,
3899                                             async_arg);
3900                 cur_entry = next_entry;
3901         }
3902 }
3903
3904 static void
3905 xpt_dev_async_default(u_int32_t async_code, struct cam_eb *bus,
3906                       struct cam_et *target, struct cam_ed *device,
3907                       void *async_arg)
3908 {
3909         printf("%s called\n", __func__);
3910 }
3911
3912 u_int32_t
3913 xpt_freeze_devq_rl(struct cam_path *path, cam_rl rl, u_int count)
3914 {
3915         struct cam_ed *dev = path->device;
3916
3917         mtx_assert(path->bus->sim->mtx, MA_OWNED);
3918         dev->sim->devq->alloc_openings +=
3919             cam_ccbq_freeze(&dev->ccbq, rl, count);
3920         /* Remove frozen device from allocq. */
3921         if (device_is_alloc_queued(dev) &&
3922             cam_ccbq_frozen(&dev->ccbq, CAM_PRIORITY_TO_RL(
3923              CAMQ_GET_PRIO(&dev->drvq)))) {
3924                 camq_remove(&dev->sim->devq->alloc_queue,
3925                     dev->alloc_ccb_entry.pinfo.index);
3926         }
3927         /* Remove frozen device from sendq. */
3928         if (device_is_send_queued(dev) &&
3929             cam_ccbq_frozen_top(&dev->ccbq)) {
3930                 camq_remove(&dev->sim->devq->send_queue,
3931                     dev->send_ccb_entry.pinfo.index);
3932         }
3933         return (dev->ccbq.queue.qfrozen_cnt[rl]);
3934 }
3935
3936 u_int32_t
3937 xpt_freeze_devq(struct cam_path *path, u_int count)
3938 {
3939
3940         return (xpt_freeze_devq_rl(path, 0, count));
3941 }
3942
3943 u_int32_t
3944 xpt_freeze_simq(struct cam_sim *sim, u_int count)
3945 {
3946
3947         mtx_assert(sim->mtx, MA_OWNED);
3948         sim->devq->send_queue.qfrozen_cnt[0] += count;
3949         return (sim->devq->send_queue.qfrozen_cnt[0]);
3950 }
3951
3952 static void
3953 xpt_release_devq_timeout(void *arg)
3954 {
3955         struct cam_ed *device;
3956
3957         device = (struct cam_ed *)arg;
3958
3959         xpt_release_devq_device(device, /*rl*/0, /*count*/1, /*run_queue*/TRUE);
3960 }
3961
3962 void
3963 xpt_release_devq(struct cam_path *path, u_int count, int run_queue)
3964 {
3965         mtx_assert(path->bus->sim->mtx, MA_OWNED);
3966
3967         xpt_release_devq_device(path->device, /*rl*/0, count, run_queue);
3968 }
3969
3970 void
3971 xpt_release_devq_rl(struct cam_path *path, cam_rl rl, u_int count, int run_queue)
3972 {
3973         mtx_assert(path->bus->sim->mtx, MA_OWNED);
3974
3975         xpt_release_devq_device(path->device, rl, count, run_queue);
3976 }
3977
3978 static void
3979 xpt_release_devq_device(struct cam_ed *dev, cam_rl rl, u_int count, int run_queue)
3980 {
3981
3982         if (count > dev->ccbq.queue.qfrozen_cnt[rl]) {
3983 #ifdef INVARIANTS
3984                 printf("xpt_release_devq(%d): requested %u > present %u\n",
3985                     rl, count, dev->ccbq.queue.qfrozen_cnt[rl]);
3986 #endif
3987                 count = dev->ccbq.queue.qfrozen_cnt[rl];
3988         }
3989         dev->sim->devq->alloc_openings -=
3990             cam_ccbq_release(&dev->ccbq, rl, count);
3991         if (cam_ccbq_frozen(&dev->ccbq, CAM_PRIORITY_TO_RL(
3992             CAMQ_GET_PRIO(&dev->drvq))) == 0) {
3993                 if (xpt_schedule_dev_allocq(dev->target->bus, dev))
3994                         xpt_run_dev_allocq(dev->target->bus);
3995         }
3996         if (cam_ccbq_frozen_top(&dev->ccbq) == 0) {
3997                 /*
3998                  * No longer need to wait for a successful
3999                  * command completion.
4000                  */
4001                 dev->flags &= ~CAM_DEV_REL_ON_COMPLETE;
4002                 /*
4003                  * Remove any timeouts that might be scheduled
4004                  * to release this queue.
4005                  */
4006                 if ((dev->flags & CAM_DEV_REL_TIMEOUT_PENDING) != 0) {
4007                         callout_stop(&dev->callout);
4008                         dev->flags &= ~CAM_DEV_REL_TIMEOUT_PENDING;
4009                 }
4010                 if (run_queue == 0)
4011                         return;
4012                 /*
4013                  * Now that we are unfrozen schedule the
4014                  * device so any pending transactions are
4015                  * run.
4016                  */
4017                 if (xpt_schedule_dev_sendq(dev->target->bus, dev))
4018                         xpt_run_dev_sendq(dev->target->bus);
4019         }
4020 }
4021
4022 void
4023 xpt_release_simq(struct cam_sim *sim, int run_queue)
4024 {
4025         struct  camq *sendq;
4026
4027         mtx_assert(sim->mtx, MA_OWNED);
4028         sendq = &(sim->devq->send_queue);
4029         if (sendq->qfrozen_cnt[0] <= 0) {
4030 #ifdef INVARIANTS
4031                 printf("xpt_release_simq: requested 1 > present %u\n",
4032                     sendq->qfrozen_cnt[0]);
4033 #endif
4034         } else
4035                 sendq->qfrozen_cnt[0]--;
4036         if (sendq->qfrozen_cnt[0] == 0) {
4037                 /*
4038                  * If there is a timeout scheduled to release this
4039                  * sim queue, remove it.  The queue frozen count is
4040                  * already at 0.
4041                  */
4042                 if ((sim->flags & CAM_SIM_REL_TIMEOUT_PENDING) != 0){
4043                         callout_stop(&sim->callout);
4044                         sim->flags &= ~CAM_SIM_REL_TIMEOUT_PENDING;
4045                 }
4046                 if (run_queue) {
4047                         struct cam_eb *bus;
4048
4049                         /*
4050                          * Now that we are unfrozen run the send queue.
4051                          */
4052                         bus = xpt_find_bus(sim->path_id);
4053                         xpt_run_dev_sendq(bus);
4054                         xpt_release_bus(bus);
4055                 }
4056         }
4057 }
4058
4059 /*
4060  * XXX Appears to be unused.
4061  */
4062 static void
4063 xpt_release_simq_timeout(void *arg)
4064 {
4065         struct cam_sim *sim;
4066
4067         sim = (struct cam_sim *)arg;
4068         xpt_release_simq(sim, /* run_queue */ TRUE);
4069 }
4070
4071 void
4072 xpt_done(union ccb *done_ccb)
4073 {
4074         struct cam_sim *sim;
4075         int     first;
4076
4077         CAM_DEBUG(done_ccb->ccb_h.path, CAM_DEBUG_TRACE, ("xpt_done\n"));
4078         if ((done_ccb->ccb_h.func_code & XPT_FC_QUEUED) != 0) {
4079                 /*
4080                  * Queue up the request for handling by our SWI handler
4081                  * any of the "non-immediate" type of ccbs.
4082                  */
4083                 sim = done_ccb->ccb_h.path->bus->sim;
4084                 TAILQ_INSERT_TAIL(&sim->sim_doneq, &done_ccb->ccb_h,
4085                     sim_links.tqe);
4086                 done_ccb->ccb_h.pinfo.index = CAM_DONEQ_INDEX;
4087                 if ((sim->flags & CAM_SIM_ON_DONEQ) == 0) {
4088                         mtx_lock(&cam_simq_lock);
4089                         first = TAILQ_EMPTY(&cam_simq);
4090                         TAILQ_INSERT_TAIL(&cam_simq, sim, links);
4091                         mtx_unlock(&cam_simq_lock);
4092                         sim->flags |= CAM_SIM_ON_DONEQ;
4093                         if (first)
4094                                 swi_sched(cambio_ih, 0);
4095                 }
4096         }
4097 }
4098
4099 union ccb *
4100 xpt_alloc_ccb()
4101 {
4102         union ccb *new_ccb;
4103
4104         new_ccb = malloc(sizeof(*new_ccb), M_CAMXPT, M_ZERO|M_WAITOK);
4105         return (new_ccb);
4106 }
4107
4108 union ccb *
4109 xpt_alloc_ccb_nowait()
4110 {
4111         union ccb *new_ccb;
4112
4113         new_ccb = malloc(sizeof(*new_ccb), M_CAMXPT, M_ZERO|M_NOWAIT);
4114         return (new_ccb);
4115 }
4116
4117 void
4118 xpt_free_ccb(union ccb *free_ccb)
4119 {
4120         free(free_ccb, M_CAMXPT);
4121 }
4122
4123
4124
4125 /* Private XPT functions */
4126
4127 /*
4128  * Get a CAM control block for the caller. Charge the structure to the device
4129  * referenced by the path.  If the this device has no 'credits' then the
4130  * device already has the maximum number of outstanding operations under way
4131  * and we return NULL. If we don't have sufficient resources to allocate more
4132  * ccbs, we also return NULL.
4133  */
4134 static union ccb *
4135 xpt_get_ccb(struct cam_ed *device)
4136 {
4137         union ccb *new_ccb;
4138         struct cam_sim *sim;
4139
4140         sim = device->sim;
4141         if ((new_ccb = (union ccb *)SLIST_FIRST(&sim->ccb_freeq)) == NULL) {
4142                 new_ccb = xpt_alloc_ccb_nowait();
4143                 if (new_ccb == NULL) {
4144                         return (NULL);
4145                 }
4146                 if ((sim->flags & CAM_SIM_MPSAFE) == 0)
4147                         callout_handle_init(&new_ccb->ccb_h.timeout_ch);
4148                 SLIST_INSERT_HEAD(&sim->ccb_freeq, &new_ccb->ccb_h,
4149                                   xpt_links.sle);
4150                 sim->ccb_count++;
4151         }
4152         cam_ccbq_take_opening(&device->ccbq);
4153         SLIST_REMOVE_HEAD(&sim->ccb_freeq, xpt_links.sle);
4154         return (new_ccb);
4155 }
4156
4157 static void
4158 xpt_release_bus(struct cam_eb *bus)
4159 {
4160
4161         if ((--bus->refcount == 0)
4162          && (TAILQ_FIRST(&bus->et_entries) == NULL)) {
4163                 mtx_lock(&xsoftc.xpt_topo_lock);
4164                 TAILQ_REMOVE(&xsoftc.xpt_busses, bus, links);
4165                 xsoftc.bus_generation++;
4166                 mtx_unlock(&xsoftc.xpt_topo_lock);
4167                 cam_sim_release(bus->sim);
4168                 free(bus, M_CAMXPT);
4169         }
4170 }
4171
4172 static struct cam_et *
4173 xpt_alloc_target(struct cam_eb *bus, target_id_t target_id)
4174 {
4175         struct cam_et *target;
4176
4177         target = (struct cam_et *)malloc(sizeof(*target), M_CAMXPT, M_NOWAIT);
4178         if (target != NULL) {
4179                 struct cam_et *cur_target;
4180
4181                 TAILQ_INIT(&target->ed_entries);
4182                 target->bus = bus;
4183                 target->target_id = target_id;
4184                 target->refcount = 1;
4185                 target->generation = 0;
4186                 timevalclear(&target->last_reset);
4187                 /*
4188                  * Hold a reference to our parent bus so it
4189                  * will not go away before we do.
4190                  */
4191                 bus->refcount++;
4192
4193                 /* Insertion sort into our bus's target list */
4194                 cur_target = TAILQ_FIRST(&bus->et_entries);
4195                 while (cur_target != NULL && cur_target->target_id < target_id)
4196                         cur_target = TAILQ_NEXT(cur_target, links);
4197
4198                 if (cur_target != NULL) {
4199                         TAILQ_INSERT_BEFORE(cur_target, target, links);
4200                 } else {
4201                         TAILQ_INSERT_TAIL(&bus->et_entries, target, links);
4202                 }
4203                 bus->generation++;
4204         }
4205         return (target);
4206 }
4207
4208 static void
4209 xpt_release_target(struct cam_et *target)
4210 {
4211
4212         if ((--target->refcount == 0)
4213          && (TAILQ_FIRST(&target->ed_entries) == NULL)) {
4214                 TAILQ_REMOVE(&target->bus->et_entries, target, links);
4215                 target->bus->generation++;
4216                 xpt_release_bus(target->bus);
4217                 free(target, M_CAMXPT);
4218         }
4219 }
4220
4221 static struct cam_ed *
4222 xpt_alloc_device_default(struct cam_eb *bus, struct cam_et *target,
4223                          lun_id_t lun_id)
4224 {
4225         struct cam_ed *device, *cur_device;
4226
4227         device = xpt_alloc_device(bus, target, lun_id);
4228         if (device == NULL)
4229                 return (NULL);
4230
4231         device->mintags = 1;
4232         device->maxtags = 1;
4233         bus->sim->max_ccbs += device->ccbq.devq_openings;
4234         cur_device = TAILQ_FIRST(&target->ed_entries);
4235         while (cur_device != NULL && cur_device->lun_id < lun_id)
4236                 cur_device = TAILQ_NEXT(cur_device, links);
4237         if (cur_device != NULL) {
4238                 TAILQ_INSERT_BEFORE(cur_device, device, links);
4239         } else {
4240                 TAILQ_INSERT_TAIL(&target->ed_entries, device, links);
4241         }
4242         target->generation++;
4243
4244         return (device);
4245 }
4246
4247 struct cam_ed *
4248 xpt_alloc_device(struct cam_eb *bus, struct cam_et *target, lun_id_t lun_id)
4249 {
4250         struct     cam_ed *device;
4251         struct     cam_devq *devq;
4252         cam_status status;
4253
4254         /* Make space for us in the device queue on our bus */
4255         devq = bus->sim->devq;
4256         status = cam_devq_resize(devq, devq->alloc_queue.array_size + 1);
4257
4258         if (status != CAM_REQ_CMP) {
4259                 device = NULL;
4260         } else {
4261                 device = (struct cam_ed *)malloc(sizeof(*device),
4262                                                  M_CAMXPT, M_NOWAIT);
4263         }
4264
4265         if (device != NULL) {
4266                 cam_init_pinfo(&device->alloc_ccb_entry.pinfo);
4267                 device->alloc_ccb_entry.device = device;
4268                 cam_init_pinfo(&device->send_ccb_entry.pinfo);
4269                 device->send_ccb_entry.device = device;
4270                 device->target = target;
4271                 device->lun_id = lun_id;
4272                 device->sim = bus->sim;
4273                 /* Initialize our queues */
4274                 if (camq_init(&device->drvq, 0) != 0) {
4275                         free(device, M_CAMXPT);
4276                         return (NULL);
4277                 }
4278                 if (cam_ccbq_init(&device->ccbq,
4279                                   bus->sim->max_dev_openings) != 0) {
4280                         camq_fini(&device->drvq);
4281                         free(device, M_CAMXPT);
4282                         return (NULL);
4283                 }
4284                 SLIST_INIT(&device->asyncs);
4285                 SLIST_INIT(&device->periphs);
4286                 device->generation = 0;
4287                 device->owner = NULL;
4288                 device->flags = CAM_DEV_UNCONFIGURED;
4289                 device->tag_delay_count = 0;
4290                 device->tag_saved_openings = 0;
4291                 device->refcount = 1;
4292                 callout_init_mtx(&device->callout, bus->sim->mtx, 0);
4293
4294                 /*
4295                  * Hold a reference to our parent target so it
4296                  * will not go away before we do.
4297                  */
4298                 target->refcount++;
4299
4300         }
4301         return (device);
4302 }
4303
4304 void
4305 xpt_acquire_device(struct cam_ed *device)
4306 {
4307
4308         device->refcount++;
4309 }
4310
4311 void
4312 xpt_release_device(struct cam_ed *device)
4313 {
4314
4315         if (--device->refcount == 0) {
4316                 struct cam_devq *devq;
4317
4318                 if (device->alloc_ccb_entry.pinfo.index != CAM_UNQUEUED_INDEX
4319                  || device->send_ccb_entry.pinfo.index != CAM_UNQUEUED_INDEX)
4320                         panic("Removing device while still queued for ccbs");
4321
4322                 if ((device->flags & CAM_DEV_REL_TIMEOUT_PENDING) != 0)
4323                                 callout_stop(&device->callout);
4324
4325                 TAILQ_REMOVE(&device->target->ed_entries, device,links);
4326                 device->target->generation++;
4327                 device->target->bus->sim->max_ccbs -= device->ccbq.devq_openings;
4328                 /* Release our slot in the devq */
4329                 devq = device->target->bus->sim->devq;
4330                 cam_devq_resize(devq, devq->alloc_queue.array_size - 1);
4331                 camq_fini(&device->drvq);
4332                 cam_ccbq_fini(&device->ccbq);
4333                 xpt_release_target(device->target);
4334                 free(device, M_CAMXPT);
4335         }
4336 }
4337
4338 u_int32_t
4339 xpt_dev_ccbq_resize(struct cam_path *path, int newopenings)
4340 {
4341         int     diff;
4342         int     result;
4343         struct  cam_ed *dev;
4344
4345         dev = path->device;
4346
4347         diff = newopenings - (dev->ccbq.dev_active + dev->ccbq.dev_openings);
4348         result = cam_ccbq_resize(&dev->ccbq, newopenings);
4349         if (result == CAM_REQ_CMP && (diff < 0)) {
4350                 dev->flags |= CAM_DEV_RESIZE_QUEUE_NEEDED;
4351         }
4352         if ((dev->flags & CAM_DEV_TAG_AFTER_COUNT) != 0
4353          || (dev->inq_flags & SID_CmdQue) != 0)
4354                 dev->tag_saved_openings = newopenings;
4355         /* Adjust the global limit */
4356         dev->sim->max_ccbs += diff;
4357         return (result);
4358 }
4359
4360 static struct cam_eb *
4361 xpt_find_bus(path_id_t path_id)
4362 {
4363         struct cam_eb *bus;
4364
4365         mtx_lock(&xsoftc.xpt_topo_lock);
4366         for (bus = TAILQ_FIRST(&xsoftc.xpt_busses);
4367              bus != NULL;
4368              bus = TAILQ_NEXT(bus, links)) {
4369                 if (bus->path_id == path_id) {
4370                         bus->refcount++;
4371                         break;
4372                 }
4373         }
4374         mtx_unlock(&xsoftc.xpt_topo_lock);
4375         return (bus);
4376 }
4377
4378 static struct cam_et *
4379 xpt_find_target(struct cam_eb *bus, target_id_t target_id)
4380 {
4381         struct cam_et *target;
4382
4383         for (target = TAILQ_FIRST(&bus->et_entries);
4384              target != NULL;
4385              target = TAILQ_NEXT(target, links)) {
4386                 if (target->target_id == target_id) {
4387                         target->refcount++;
4388                         break;
4389                 }
4390         }
4391         return (target);
4392 }
4393
4394 static struct cam_ed *
4395 xpt_find_device(struct cam_et *target, lun_id_t lun_id)
4396 {
4397         struct cam_ed *device;
4398
4399         for (device = TAILQ_FIRST(&target->ed_entries);
4400              device != NULL;
4401              device = TAILQ_NEXT(device, links)) {
4402                 if (device->lun_id == lun_id) {
4403                         device->refcount++;
4404                         break;
4405                 }
4406         }
4407         return (device);
4408 }
4409
4410 void
4411 xpt_start_tags(struct cam_path *path)
4412 {
4413         struct ccb_relsim crs;
4414         struct cam_ed *device;
4415         struct cam_sim *sim;
4416         int    newopenings;
4417
4418         device = path->device;
4419         sim = path->bus->sim;
4420         device->flags &= ~CAM_DEV_TAG_AFTER_COUNT;
4421         xpt_freeze_devq(path, /*count*/1);
4422         device->inq_flags |= SID_CmdQue;
4423         if (device->tag_saved_openings != 0)
4424                 newopenings = device->tag_saved_openings;
4425         else
4426                 newopenings = min(device->maxtags,
4427                                   sim->max_tagged_dev_openings);
4428         xpt_dev_ccbq_resize(path, newopenings);
4429         xpt_setup_ccb(&crs.ccb_h, path, CAM_PRIORITY_NORMAL);
4430         crs.ccb_h.func_code = XPT_REL_SIMQ;
4431         crs.release_flags = RELSIM_RELEASE_AFTER_QEMPTY;
4432         crs.openings
4433             = crs.release_timeout
4434             = crs.qfrozen_cnt
4435             = 0;
4436         xpt_action((union ccb *)&crs);
4437 }
4438
4439 void
4440 xpt_stop_tags(struct cam_path *path)
4441 {
4442         struct ccb_relsim crs;
4443         struct cam_ed *device;
4444         struct cam_sim *sim;
4445
4446         device = path->device;
4447         sim = path->bus->sim;
4448         device->flags &= ~CAM_DEV_TAG_AFTER_COUNT;
4449         device->tag_delay_count = 0;
4450         xpt_freeze_devq(path, /*count*/1);
4451         device->inq_flags &= ~SID_CmdQue;
4452         xpt_dev_ccbq_resize(path, sim->max_dev_openings);
4453         xpt_setup_ccb(&crs.ccb_h, path, CAM_PRIORITY_NORMAL);
4454         crs.ccb_h.func_code = XPT_REL_SIMQ;
4455         crs.release_flags = RELSIM_RELEASE_AFTER_QEMPTY;
4456         crs.openings
4457             = crs.release_timeout
4458             = crs.qfrozen_cnt
4459             = 0;
4460         xpt_action((union ccb *)&crs);
4461 }
4462
4463 static void
4464 xpt_boot_delay(void *arg)
4465 {
4466
4467         xpt_release_boot();
4468 }
4469
4470 static void
4471 xpt_config(void *arg)
4472 {
4473         /*
4474          * Now that interrupts are enabled, go find our devices
4475          */
4476
4477 #ifdef CAMDEBUG
4478         /* Setup debugging flags and path */
4479 #ifdef CAM_DEBUG_FLAGS
4480         cam_dflags = CAM_DEBUG_FLAGS;
4481 #else /* !CAM_DEBUG_FLAGS */
4482         cam_dflags = CAM_DEBUG_NONE;
4483 #endif /* CAM_DEBUG_FLAGS */
4484 #ifdef CAM_DEBUG_BUS
4485         if (cam_dflags != CAM_DEBUG_NONE) {
4486                 /*
4487                  * Locking is specifically omitted here.  No SIMs have
4488                  * registered yet, so xpt_create_path will only be searching
4489                  * empty lists of targets and devices.
4490                  */
4491                 if (xpt_create_path(&cam_dpath, xpt_periph,
4492                                     CAM_DEBUG_BUS, CAM_DEBUG_TARGET,
4493                                     CAM_DEBUG_LUN) != CAM_REQ_CMP) {
4494                         printf("xpt_config: xpt_create_path() failed for debug"
4495                                " target %d:%d:%d, debugging disabled\n",
4496                                CAM_DEBUG_BUS, CAM_DEBUG_TARGET, CAM_DEBUG_LUN);
4497                         cam_dflags = CAM_DEBUG_NONE;
4498                 }
4499         } else
4500                 cam_dpath = NULL;
4501 #else /* !CAM_DEBUG_BUS */
4502         cam_dpath = NULL;
4503 #endif /* CAM_DEBUG_BUS */
4504 #endif /* CAMDEBUG */
4505
4506         periphdriver_init(1);
4507         xpt_hold_boot();
4508         callout_init(&xsoftc.boot_callout, 1);
4509         callout_reset(&xsoftc.boot_callout, hz * xsoftc.boot_delay / 1000,
4510             xpt_boot_delay, NULL);
4511         /* Fire up rescan thread. */
4512         if (kproc_create(xpt_scanner_thread, NULL, NULL, 0, 0, "xpt_thrd")) {
4513                 printf("xpt_init: failed to create rescan thread\n");
4514         }
4515 }
4516
4517 void
4518 xpt_hold_boot(void)
4519 {
4520         xpt_lock_buses();
4521         xsoftc.buses_to_config++;
4522         xpt_unlock_buses();
4523 }
4524
4525 void
4526 xpt_release_boot(void)
4527 {
4528         xpt_lock_buses();
4529         xsoftc.buses_to_config--;
4530         if (xsoftc.buses_to_config == 0 && xsoftc.buses_config_done == 0) {
4531                 struct  xpt_task *task;
4532
4533                 xsoftc.buses_config_done = 1;
4534                 xpt_unlock_buses();
4535                 /* Call manually because we don't have any busses */
4536                 task = malloc(sizeof(struct xpt_task), M_CAMXPT, M_NOWAIT);
4537                 if (task != NULL) {
4538                         TASK_INIT(&task->task, 0, xpt_finishconfig_task, task);
4539                         taskqueue_enqueue(taskqueue_thread, &task->task);
4540                 }
4541         } else
4542                 xpt_unlock_buses();
4543 }
4544
4545 /*
4546  * If the given device only has one peripheral attached to it, and if that
4547  * peripheral is the passthrough driver, announce it.  This insures that the
4548  * user sees some sort of announcement for every peripheral in their system.
4549  */
4550 static int
4551 xptpassannouncefunc(struct cam_ed *device, void *arg)
4552 {
4553         struct cam_periph *periph;
4554         int i;
4555
4556         for (periph = SLIST_FIRST(&device->periphs), i = 0; periph != NULL;
4557              periph = SLIST_NEXT(periph, periph_links), i++);
4558
4559         periph = SLIST_FIRST(&device->periphs);
4560         if ((i == 1)
4561          && (strncmp(periph->periph_name, "pass", 4) == 0))
4562                 xpt_announce_periph(periph, NULL);
4563
4564         return(1);
4565 }
4566
4567 static void
4568 xpt_finishconfig_task(void *context, int pending)
4569 {
4570
4571         periphdriver_init(2);
4572         /*
4573          * Check for devices with no "standard" peripheral driver
4574          * attached.  For any devices like that, announce the
4575          * passthrough driver so the user will see something.
4576          */
4577         xpt_for_all_devices(xptpassannouncefunc, NULL);
4578
4579         /* Release our hook so that the boot can continue. */
4580         config_intrhook_disestablish(xsoftc.xpt_config_hook);
4581         free(xsoftc.xpt_config_hook, M_CAMXPT);
4582         xsoftc.xpt_config_hook = NULL;
4583
4584         free(context, M_CAMXPT);
4585 }
4586
4587 cam_status
4588 xpt_register_async(int event, ac_callback_t *cbfunc, void *cbarg,
4589                    struct cam_path *path)
4590 {
4591         struct ccb_setasync csa;
4592         cam_status status;
4593         int xptpath = 0;
4594
4595         if (path == NULL) {
4596                 mtx_lock(&xsoftc.xpt_lock);
4597                 status = xpt_create_path(&path, /*periph*/NULL, CAM_XPT_PATH_ID,
4598                                          CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD);
4599                 if (status != CAM_REQ_CMP) {
4600                         mtx_unlock(&xsoftc.xpt_lock);
4601                         return (status);
4602                 }
4603                 xptpath = 1;
4604         }
4605
4606         xpt_setup_ccb(&csa.ccb_h, path, CAM_PRIORITY_NORMAL);
4607         csa.ccb_h.func_code = XPT_SASYNC_CB;
4608         csa.event_enable = event;
4609         csa.callback = cbfunc;
4610         csa.callback_arg = cbarg;
4611         xpt_action((union ccb *)&csa);
4612         status = csa.ccb_h.status;
4613         if (xptpath) {
4614                 xpt_free_path(path);
4615                 mtx_unlock(&xsoftc.xpt_lock);
4616
4617                 if ((status == CAM_REQ_CMP) &&
4618                     (csa.event_enable & AC_FOUND_DEVICE)) {
4619                         /*
4620                          * Get this peripheral up to date with all
4621                          * the currently existing devices.
4622                          */
4623                         xpt_for_all_devices(xptsetasyncfunc, &csa);
4624                 }
4625                 if ((status == CAM_REQ_CMP) &&
4626                     (csa.event_enable & AC_PATH_REGISTERED)) {
4627                         /*
4628                          * Get this peripheral up to date with all
4629                          * the currently existing busses.
4630                          */
4631                         xpt_for_all_busses(xptsetasyncbusfunc, &csa);
4632                 }
4633         }
4634         return (status);
4635 }
4636
4637 static void
4638 xptaction(struct cam_sim *sim, union ccb *work_ccb)
4639 {
4640         CAM_DEBUG(work_ccb->ccb_h.path, CAM_DEBUG_TRACE, ("xptaction\n"));
4641
4642         switch (work_ccb->ccb_h.func_code) {
4643         /* Common cases first */
4644         case XPT_PATH_INQ:              /* Path routing inquiry */
4645         {
4646                 struct ccb_pathinq *cpi;
4647
4648                 cpi = &work_ccb->cpi;
4649                 cpi->version_num = 1; /* XXX??? */
4650                 cpi->hba_inquiry = 0;
4651                 cpi->target_sprt = 0;
4652                 cpi->hba_misc = 0;
4653                 cpi->hba_eng_cnt = 0;
4654                 cpi->max_target = 0;
4655                 cpi->max_lun = 0;
4656                 cpi->initiator_id = 0;
4657                 strncpy(cpi->sim_vid, "FreeBSD", SIM_IDLEN);
4658                 strncpy(cpi->hba_vid, "", HBA_IDLEN);
4659                 strncpy(cpi->dev_name, sim->sim_name, DEV_IDLEN);
4660                 cpi->unit_number = sim->unit_number;
4661                 cpi->bus_id = sim->bus_id;
4662                 cpi->base_transfer_speed = 0;
4663                 cpi->protocol = PROTO_UNSPECIFIED;
4664                 cpi->protocol_version = PROTO_VERSION_UNSPECIFIED;
4665                 cpi->transport = XPORT_UNSPECIFIED;
4666                 cpi->transport_version = XPORT_VERSION_UNSPECIFIED;
4667                 cpi->ccb_h.status = CAM_REQ_CMP;
4668                 xpt_done(work_ccb);
4669                 break;
4670         }
4671         default:
4672                 work_ccb->ccb_h.status = CAM_REQ_INVALID;
4673                 xpt_done(work_ccb);
4674                 break;
4675         }
4676 }
4677
4678 /*
4679  * The xpt as a "controller" has no interrupt sources, so polling
4680  * is a no-op.
4681  */
4682 static void
4683 xptpoll(struct cam_sim *sim)
4684 {
4685 }
4686
4687 void
4688 xpt_lock_buses(void)
4689 {
4690         mtx_lock(&xsoftc.xpt_topo_lock);
4691 }
4692
4693 void
4694 xpt_unlock_buses(void)
4695 {
4696         mtx_unlock(&xsoftc.xpt_topo_lock);
4697 }
4698
4699 static void
4700 camisr(void *dummy)
4701 {
4702         cam_simq_t queue;
4703         struct cam_sim *sim;
4704
4705         mtx_lock(&cam_simq_lock);
4706         TAILQ_INIT(&queue);
4707         while (!TAILQ_EMPTY(&cam_simq)) {
4708                 TAILQ_CONCAT(&queue, &cam_simq, links);
4709                 mtx_unlock(&cam_simq_lock);
4710
4711                 while ((sim = TAILQ_FIRST(&queue)) != NULL) {
4712                         TAILQ_REMOVE(&queue, sim, links);
4713                         CAM_SIM_LOCK(sim);
4714                         sim->flags &= ~CAM_SIM_ON_DONEQ;
4715                         camisr_runqueue(&sim->sim_doneq);
4716                         CAM_SIM_UNLOCK(sim);
4717                 }
4718                 mtx_lock(&cam_simq_lock);
4719         }
4720         mtx_unlock(&cam_simq_lock);
4721 }
4722
4723 static void
4724 camisr_runqueue(void *V_queue)
4725 {
4726         cam_isrq_t *queue = V_queue;
4727         struct  ccb_hdr *ccb_h;
4728
4729         while ((ccb_h = TAILQ_FIRST(queue)) != NULL) {
4730                 int     runq;
4731
4732                 TAILQ_REMOVE(queue, ccb_h, sim_links.tqe);
4733                 ccb_h->pinfo.index = CAM_UNQUEUED_INDEX;
4734
4735                 CAM_DEBUG(ccb_h->path, CAM_DEBUG_TRACE,
4736                           ("camisr\n"));
4737
4738                 runq = FALSE;
4739
4740                 if (ccb_h->flags & CAM_HIGH_POWER) {
4741                         struct highpowerlist    *hphead;
4742                         union ccb               *send_ccb;
4743
4744                         mtx_lock(&xsoftc.xpt_lock);
4745                         hphead = &xsoftc.highpowerq;
4746
4747                         send_ccb = (union ccb *)STAILQ_FIRST(hphead);
4748
4749                         /*
4750                          * Increment the count since this command is done.
4751                          */
4752                         xsoftc.num_highpower++;
4753
4754                         /*
4755                          * Any high powered commands queued up?
4756                          */
4757                         if (send_ccb != NULL) {
4758
4759                                 STAILQ_REMOVE_HEAD(hphead, xpt_links.stqe);
4760                                 mtx_unlock(&xsoftc.xpt_lock);
4761
4762                                 xpt_release_devq(send_ccb->ccb_h.path,
4763                                                  /*count*/1, /*runqueue*/TRUE);
4764                         } else
4765                                 mtx_unlock(&xsoftc.xpt_lock);
4766                 }
4767
4768                 if ((ccb_h->func_code & XPT_FC_USER_CCB) == 0) {
4769                         struct cam_ed *dev;
4770
4771                         dev = ccb_h->path->device;
4772
4773                         cam_ccbq_ccb_done(&dev->ccbq, (union ccb *)ccb_h);
4774                         ccb_h->path->bus->sim->devq->send_active--;
4775                         ccb_h->path->bus->sim->devq->send_openings++;
4776                         runq = TRUE;
4777
4778                         if (((dev->flags & CAM_DEV_REL_ON_COMPLETE) != 0
4779                           && (ccb_h->status&CAM_STATUS_MASK) != CAM_REQUEUE_REQ)
4780                          || ((dev->flags & CAM_DEV_REL_ON_QUEUE_EMPTY) != 0
4781                           && (dev->ccbq.dev_active == 0))) {
4782                                 xpt_release_devq(ccb_h->path, /*count*/1,
4783                                                  /*run_queue*/FALSE);
4784                         }
4785
4786                         if ((dev->flags & CAM_DEV_TAG_AFTER_COUNT) != 0
4787                          && (--dev->tag_delay_count == 0))
4788                                 xpt_start_tags(ccb_h->path);
4789                         if (!device_is_send_queued(dev))
4790                                 xpt_schedule_dev_sendq(ccb_h->path->bus, dev);
4791                 }
4792
4793                 if (ccb_h->status & CAM_RELEASE_SIMQ) {
4794                         xpt_release_simq(ccb_h->path->bus->sim,
4795                                          /*run_queue*/TRUE);
4796                         ccb_h->status &= ~CAM_RELEASE_SIMQ;
4797                         runq = FALSE;
4798                 }
4799
4800                 if ((ccb_h->flags & CAM_DEV_QFRZDIS)
4801                  && (ccb_h->status & CAM_DEV_QFRZN)) {
4802                         xpt_release_devq(ccb_h->path, /*count*/1,
4803                                          /*run_queue*/TRUE);
4804                         ccb_h->status &= ~CAM_DEV_QFRZN;
4805                 } else if (runq) {
4806                         xpt_run_dev_sendq(ccb_h->path->bus);
4807                 }
4808
4809                 /* Call the peripheral driver's callback */
4810                 (*ccb_h->cbfcnp)(ccb_h->path->periph, (union ccb *)ccb_h);
4811         }
4812 }