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/md5.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
 106         /* Registered busses */
 107         TAILQ_HEAD(,cam_eb)     xpt_busses;
 108         u_int                   bus_generation;
 109
 110         struct intr_config_hook *xpt_config_hook;
 111
 112         struct mtx              xpt_topo_lock;
 113         struct mtx              xpt_lock;
 114 };
 115
 116 typedef enum {
 117         DM_RET_COPY             = 0x01,
 118         DM_RET_FLAG_MASK        = 0x0f,
 119         DM_RET_NONE             = 0x00,
 120         DM_RET_STOP             = 0x10,
 121         DM_RET_DESCEND          = 0x20,
 122         DM_RET_ERROR            = 0x30,
 123         DM_RET_ACTION_MASK      = 0xf0
 124 } dev_match_ret;
 125
 126 typedef enum {
 127         XPT_DEPTH_BUS,
 128         XPT_DEPTH_TARGET,
 129         XPT_DEPTH_DEVICE,
 130         XPT_DEPTH_PERIPH
 131 } xpt_traverse_depth;
 132
 133 struct xpt_traverse_config {
 134         xpt_traverse_depth      depth;
 135         void                    *tr_func;
 136         void                    *tr_arg;
 137 };
 138
 139 typedef int     xpt_busfunc_t (struct cam_eb *bus, void *arg);
 140 typedef int     xpt_targetfunc_t (struct cam_et *target, void *arg);
 141 typedef int     xpt_devicefunc_t (struct cam_ed *device, void *arg);
 142 typedef int     xpt_periphfunc_t (struct cam_periph *periph, void *arg);
 143 typedef int     xpt_pdrvfunc_t (struct periph_driver **pdrv, void *arg);
 144
 145 /* Transport layer configuration information */
 146 static struct xpt_softc xsoftc;
 147
 148 /* Queues for our software interrupt handler */
 149 typedef TAILQ_HEAD(cam_isrq, ccb_hdr) cam_isrq_t;
 150 typedef TAILQ_HEAD(cam_simq, cam_sim) cam_simq_t;
 151 static cam_simq_t cam_simq;
 152 static struct mtx cam_simq_lock;
 153
 154 /* Pointers to software interrupt handlers */
 155 static void *cambio_ih;
 156
 157 struct cam_periph *xpt_periph;
 158
 159 static periph_init_t xpt_periph_init;
 160
 161 static struct periph_driver xpt_driver =
 162 {
 163         xpt_periph_init, "xpt",
 164         TAILQ_HEAD_INITIALIZER(xpt_driver.units)
 165 };
 166
 167 PERIPHDRIVER_DECLARE(xpt, xpt_driver);
 168
 169 static d_open_t xptopen;
 170 static d_close_t xptclose;
 171 static d_ioctl_t xptioctl;
 172
 173 static struct cdevsw xpt_cdevsw = {
 174         .d_version =    D_VERSION,
 175         .d_flags =      0,
 176         .d_open =       xptopen,
 177         .d_close =      xptclose,
 178         .d_ioctl =      xptioctl,
 179         .d_name =       "xpt",
 180 };
 181
 182 /* Storage for debugging datastructures */
 183 #ifdef  CAMDEBUG
 184 struct cam_path *cam_dpath;
 185 u_int32_t cam_dflags;
 186 u_int32_t cam_debug_delay;
 187 #endif
 188
 189 /* Our boot-time initialization hook */
 190 static int cam_module_event_handler(module_t, int /*modeventtype_t*/, void *);
 191
 192 static moduledata_t cam_moduledata = {
 193         "cam",
 194         cam_module_event_handler,
 195         NULL
 196 };
 197
 198 static int      xpt_init(void *);
 199
 200 DECLARE_MODULE(cam, cam_moduledata, SI_SUB_CONFIGURE, SI_ORDER_SECOND);
 201 MODULE_VERSION(cam, 1);
 202
 203
 204 static void             xpt_async_bcast(struct async_list *async_head,
 205                                         u_int32_t async_code,
 206                                         struct cam_path *path,
 207                                         void *async_arg);
 208 static path_id_t xptnextfreepathid(void);
 209 static path_id_t xptpathid(const char *sim_name, int sim_unit, int sim_bus);
 210 static union ccb *xpt_get_ccb(struct cam_ed *device);
 211 static void      xpt_run_dev_allocq(struct cam_eb *bus);
 212 static timeout_t xpt_release_devq_timeout;
 213 static void      xpt_release_simq_timeout(void *arg) __unused;
 214 static void      xpt_release_bus(struct cam_eb *bus);
 215 static void      xpt_release_devq_device(struct cam_ed *dev, u_int count,
 216                                          int run_queue);
 217 static struct cam_et*
 218                  xpt_alloc_target(struct cam_eb *bus, target_id_t target_id);
 219 static void      xpt_release_target(struct cam_eb *bus, struct cam_et *target);
 220 static void      xpt_release_device(struct cam_eb *bus, struct cam_et *target,
 221                                     struct cam_ed *device);
 222 static struct cam_eb*
 223                  xpt_find_bus(path_id_t path_id);
 224 static struct cam_et*
 225                  xpt_find_target(struct cam_eb *bus, target_id_t target_id);
 226 static struct cam_ed*
 227                  xpt_find_device(struct cam_et *target, lun_id_t lun_id);
 228 static xpt_busfunc_t    xptconfigbuscountfunc;
 229 static xpt_busfunc_t    xptconfigfunc;
 230 static void      xpt_config(void *arg);
 231 static xpt_devicefunc_t xptpassannouncefunc;
 232 static void      xpt_finishconfig(struct cam_periph *periph, union ccb *ccb);
 233 static void      xptaction(struct cam_sim *sim, union ccb *work_ccb);
 234 static void      xptpoll(struct cam_sim *sim);
 235 static void      camisr(void *);
 236 static void      camisr_runqueue(void *);
 237 static dev_match_ret    xptbusmatch(struct dev_match_pattern *patterns,
 238                                     u_int num_patterns, struct cam_eb *bus);
 239 static dev_match_ret    xptdevicematch(struct dev_match_pattern *patterns,
 240                                        u_int num_patterns,
 241                                        struct cam_ed *device);
 242 static dev_match_ret    xptperiphmatch(struct dev_match_pattern *patterns,
 243                                        u_int num_patterns,
 244                                        struct cam_periph *periph);
 245 static xpt_busfunc_t    xptedtbusfunc;
 246 static xpt_targetfunc_t xptedttargetfunc;
 247 static xpt_devicefunc_t xptedtdevicefunc;
 248 static xpt_periphfunc_t xptedtperiphfunc;
 249 static xpt_pdrvfunc_t   xptplistpdrvfunc;
 250 static xpt_periphfunc_t xptplistperiphfunc;
 251 static int              xptedtmatch(struct ccb_dev_match *cdm);
 252 static int              xptperiphlistmatch(struct ccb_dev_match *cdm);
 253 static int              xptbustraverse(struct cam_eb *start_bus,
 254                                        xpt_busfunc_t *tr_func, void *arg);
 255 static int              xpttargettraverse(struct cam_eb *bus,
 256                                           struct cam_et *start_target,
 257                                           xpt_targetfunc_t *tr_func, void *arg);
 258 static int              xptdevicetraverse(struct cam_et *target,
 259                                           struct cam_ed *start_device,
 260                                           xpt_devicefunc_t *tr_func, void *arg);
 261 static int              xptperiphtraverse(struct cam_ed *device,
 262                                           struct cam_periph *start_periph,
 263                                           xpt_periphfunc_t *tr_func, void *arg);
 264 static int              xptpdrvtraverse(struct periph_driver **start_pdrv,
 265                                         xpt_pdrvfunc_t *tr_func, void *arg);
 266 static int              xptpdperiphtraverse(struct periph_driver **pdrv,
 267                                             struct cam_periph *start_periph,
 268                                             xpt_periphfunc_t *tr_func,
 269                                             void *arg);
 270 static xpt_busfunc_t    xptdefbusfunc;
 271 static xpt_targetfunc_t xptdeftargetfunc;
 272 static xpt_devicefunc_t xptdefdevicefunc;
 273 static xpt_periphfunc_t xptdefperiphfunc;
 274 static int              xpt_for_all_busses(xpt_busfunc_t *tr_func, void *arg);
 275 static int              xpt_for_all_devices(xpt_devicefunc_t *tr_func,
 276                                             void *arg);
 277 static void             xpt_dev_async_default(u_int32_t async_code,
 278                                               struct cam_eb *bus,
 279                                               struct cam_et *target,
 280                                               struct cam_ed *device,
 281                                               void *async_arg);
 282 static struct cam_ed *  xpt_alloc_device_default(struct cam_eb *bus,
 283                                                  struct cam_et *target,
 284                                                  lun_id_t lun_id);
 285 static xpt_devicefunc_t xptsetasyncfunc;
 286 static xpt_busfunc_t    xptsetasyncbusfunc;
 287 static cam_status       xptregister(struct cam_periph *periph,
 288                                     void *arg);
 289 static void      xpt_start_tags(struct cam_path *path);
 290 static __inline int xpt_schedule_dev_allocq(struct cam_eb *bus,
 291                                             struct cam_ed *dev);
 292 static __inline int periph_is_queued(struct cam_periph *periph);
 293 static __inline int device_is_alloc_queued(struct cam_ed *device);
 294 static __inline int device_is_send_queued(struct cam_ed *device);
 295 static __inline int dev_allocq_is_runnable(struct cam_devq *devq);
 296
 297 static __inline int
 298 xpt_schedule_dev_allocq(struct cam_eb *bus, struct cam_ed *dev)
 299 {
 300         int retval;
 301
 302         if (dev->ccbq.devq_openings > 0) {
 303                 if ((dev->flags & CAM_DEV_RESIZE_QUEUE_NEEDED) != 0) {
 304                         cam_ccbq_resize(&dev->ccbq,
 305                                         dev->ccbq.dev_openings
 306                                         + dev->ccbq.dev_active);
 307                         dev->flags &= ~CAM_DEV_RESIZE_QUEUE_NEEDED;
 308                 }
 309                 /*
 310                  * The priority of a device waiting for CCB resources
 311                  * is that of the 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_HEAD(&dev->drvq)->priority);
 317         } else {
 318                 retval = 0;
 319         }
 320
 321         return (retval);
 322 }
 323
 324 static __inline int
 325 periph_is_queued(struct cam_periph *periph)
 326 {
 327         return (periph->pinfo.index != CAM_UNQUEUED_INDEX);
 328 }
 329
 330 static __inline int
 331 device_is_alloc_queued(struct cam_ed *device)
 332 {
 333         return (device->alloc_ccb_entry.pinfo.index != CAM_UNQUEUED_INDEX);
 334 }
 335
 336 static __inline int
 337 device_is_send_queued(struct cam_ed *device)
 338 {
 339         return (device->send_ccb_entry.pinfo.index != CAM_UNQUEUED_INDEX);
 340 }
 341
 342 static __inline int
 343 dev_allocq_is_runnable(struct cam_devq *devq)
 344 {
 345         /*
 346          * Have work to do.
 347          * Have space to do more work.
 348          * Allowed to do work.
 349          */
 350         return ((devq->alloc_queue.qfrozen_cnt == 0)
 351              && (devq->alloc_queue.entries > 0)
 352              && (devq->alloc_openings > 0));
 353 }
 354
 355 static void
 356 xpt_periph_init()
 357 {
 358         make_dev(&xpt_cdevsw, 0, UID_ROOT, GID_OPERATOR, 0600, "xpt0");
 359 }
 360
 361 static void
 362 xptdone(struct cam_periph *periph, union ccb *done_ccb)
 363 {
 364         /* Caller will release the CCB */
 365         wakeup(&done_ccb->ccb_h.cbfcnp);
 366 }
 367
 368 static int
 369 xptopen(struct cdev *dev, int flags, int fmt, struct thread *td)
 370 {
 371
 372         /*
 373          * Only allow read-write access.
 374          */
 375         if (((flags & FWRITE) == 0) || ((flags & FREAD) == 0))
 376                 return(EPERM);
 377
 378         /*
 379          * We don't allow nonblocking access.
 380          */
 381         if ((flags & O_NONBLOCK) != 0) {
 382                 printf("%s: can't do nonblocking access\n", devtoname(dev));
 383                 return(ENODEV);
 384         }
 385
 386         /* Mark ourselves open */
 387         mtx_lock(&xsoftc.xpt_lock);
 388         xsoftc.flags |= XPT_FLAG_OPEN;
 389         mtx_unlock(&xsoftc.xpt_lock);
 390
 391         return(0);
 392 }
 393
 394 static int
 395 xptclose(struct cdev *dev, int flag, int fmt, struct thread *td)
 396 {
 397
 398         /* Mark ourselves closed */
 399         mtx_lock(&xsoftc.xpt_lock);
 400         xsoftc.flags &= ~XPT_FLAG_OPEN;
 401         mtx_unlock(&xsoftc.xpt_lock);
 402
 403         return(0);
 404 }
 405
 406 /*
 407  * Don't automatically grab the xpt softc lock here even though this is going
 408  * through the xpt device.  The xpt device is really just a back door for
 409  * accessing other devices and SIMs, so the right thing to do is to grab
 410  * the appropriate SIM lock once the bus/SIM is located.
 411  */
 412 static int
 413 xptioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flag, struct thread *td)
 414 {
 415         int error;
 416
 417         error = 0;
 418
 419         switch(cmd) {
 420         /*
 421          * For the transport layer CAMIOCOMMAND ioctl, we really only want
 422          * to accept CCB types that don't quite make sense to send through a
 423          * passthrough driver. XPT_PATH_INQ is an exception to this, as stated
 424          * in the CAM spec.
 425          */
 426         case CAMIOCOMMAND: {
 427                 union ccb *ccb;
 428                 union ccb *inccb;
 429                 struct cam_eb *bus;
 430
 431                 inccb = (union ccb *)addr;
 432
 433                 bus = xpt_find_bus(inccb->ccb_h.path_id);
 434                 if (bus == NULL) {
 435                         error = EINVAL;
 436                         break;
 437                 }
 438
 439                 switch(inccb->ccb_h.func_code) {
 440                 case XPT_SCAN_BUS:
 441                 case XPT_RESET_BUS:
 442                         if ((inccb->ccb_h.target_id != CAM_TARGET_WILDCARD)
 443                          || (inccb->ccb_h.target_lun != CAM_LUN_WILDCARD)) {
 444                                 error = EINVAL;
 445                                 break;
 446                         }
 447                         /* FALLTHROUGH */
 448                 case XPT_PATH_INQ:
 449                 case XPT_ENG_INQ:
 450                 case XPT_SCAN_LUN:
 451
 452                         ccb = xpt_alloc_ccb();
 453
 454                         CAM_SIM_LOCK(bus->sim);
 455
 456                         /*
 457                          * Create a path using the bus, target, and lun the
 458                          * user passed in.
 459                          */
 460                         if (xpt_create_path(&ccb->ccb_h.path, xpt_periph,
 461                                             inccb->ccb_h.path_id,
 462                                             inccb->ccb_h.target_id,
 463                                             inccb->ccb_h.target_lun) !=
 464                                             CAM_REQ_CMP){
 465                                 error = EINVAL;
 466                                 CAM_SIM_UNLOCK(bus->sim);
 467                                 xpt_free_ccb(ccb);
 468                                 break;
 469                         }
 470                         /* Ensure all of our fields are correct */
 471                         xpt_setup_ccb(&ccb->ccb_h, ccb->ccb_h.path,
 472                                       inccb->ccb_h.pinfo.priority);
 473                         xpt_merge_ccb(ccb, inccb);
 474                         ccb->ccb_h.cbfcnp = xptdone;
 475                         cam_periph_runccb(ccb, NULL, 0, 0, NULL);
 476                         bcopy(ccb, inccb, sizeof(union ccb));
 477                         xpt_free_path(ccb->ccb_h.path);
 478                         xpt_free_ccb(ccb);
 479                         CAM_SIM_UNLOCK(bus->sim);
 480                         break;
 481
 482                 case XPT_DEBUG: {
 483                         union ccb ccb;
 484
 485                         /*
 486                          * This is an immediate CCB, so it's okay to
 487                          * allocate it on the stack.
 488                          */
 489
 490                         CAM_SIM_LOCK(bus->sim);
 491
 492                         /*
 493                          * Create a path using the bus, target, and lun the
 494                          * user passed in.
 495                          */
 496                         if (xpt_create_path(&ccb.ccb_h.path, xpt_periph,
 497                                             inccb->ccb_h.path_id,
 498                                             inccb->ccb_h.target_id,
 499                                             inccb->ccb_h.target_lun) !=
 500                                             CAM_REQ_CMP){
 501                                 error = EINVAL;
 502                                 CAM_SIM_UNLOCK(bus->sim);
 503                                 break;
 504                         }
 505                         /* Ensure all of our fields are correct */
 506                         xpt_setup_ccb(&ccb.ccb_h, ccb.ccb_h.path,
 507                                       inccb->ccb_h.pinfo.priority);
 508                         xpt_merge_ccb(&ccb, inccb);
 509                         ccb.ccb_h.cbfcnp = xptdone;
 510                         xpt_action(&ccb);
 511                         CAM_SIM_UNLOCK(bus->sim);
 512                         bcopy(&ccb, inccb, sizeof(union ccb));
 513                         xpt_free_path(ccb.ccb_h.path);
 514                         break;
 515
 516                 }
 517                 case XPT_DEV_MATCH: {
 518                         struct cam_periph_map_info mapinfo;
 519                         struct cam_path *old_path;
 520
 521                         /*
 522                          * We can't deal with physical addresses for this
 523                          * type of transaction.
 524                          */
 525                         if (inccb->ccb_h.flags & CAM_DATA_PHYS) {
 526                                 error = EINVAL;
 527                                 break;
 528                         }
 529
 530                         /*
 531                          * Save this in case the caller had it set to
 532                          * something in particular.
 533                          */
 534                         old_path = inccb->ccb_h.path;
 535
 536                         /*
 537                          * We really don't need a path for the matching
 538                          * code.  The path is needed because of the
 539                          * debugging statements in xpt_action().  They
 540                          * assume that the CCB has a valid path.
 541                          */
 542                         inccb->ccb_h.path = xpt_periph->path;
 543
 544                         bzero(&mapinfo, sizeof(mapinfo));
 545
 546                         /*
 547                          * Map the pattern and match buffers into kernel
 548                          * virtual address space.
 549                          */
 550                         error = cam_periph_mapmem(inccb, &mapinfo);
 551
 552                         if (error) {
 553                                 inccb->ccb_h.path = old_path;
 554                                 break;
 555                         }
 556
 557                         /*
 558                          * This is an immediate CCB, we can send it on directly.
 559                          */
 560                         xpt_action(inccb);
 561
 562                         /*
 563                          * Map the buffers back into user space.
 564                          */
 565                         cam_periph_unmapmem(inccb, &mapinfo);
 566
 567                         inccb->ccb_h.path = old_path;
 568
 569                         error = 0;
 570                         break;
 571                 }
 572                 default:
 573                         error = ENOTSUP;
 574                         break;
 575                 }
 576                 xpt_release_bus(bus);
 577                 break;
 578         }
 579         /*
 580          * This is the getpassthru ioctl. It takes a XPT_GDEVLIST ccb as input,
 581          * with the periphal driver name and unit name filled in.  The other
 582          * fields don't really matter as input.  The passthrough driver name
 583          * ("pass"), and unit number are passed back in the ccb.  The current
 584          * device generation number, and the index into the device peripheral
 585          * driver list, and the status are also passed back.  Note that
 586          * since we do everything in one pass, unlike the XPT_GDEVLIST ccb,
 587          * we never return a status of CAM_GDEVLIST_LIST_CHANGED.  It is
 588          * (or rather should be) impossible for the device peripheral driver
 589          * list to change since we look at the whole thing in one pass, and
 590          * we do it with lock protection.
 591          *
 592          */
 593         case CAMGETPASSTHRU: {
 594                 union ccb *ccb;
 595                 struct cam_periph *periph;
 596                 struct periph_driver **p_drv;
 597                 char   *name;
 598                 u_int unit;
 599                 u_int cur_generation;
 600                 int base_periph_found;
 601                 int splbreaknum;
 602
 603                 ccb = (union ccb *)addr;
 604                 unit = ccb->cgdl.unit_number;
 605                 name = ccb->cgdl.periph_name;
 606                 /*
 607                  * Every 100 devices, we want to drop our lock protection to
 608                  * give the software interrupt handler a chance to run.
 609                  * Most systems won't run into this check, but this should
 610                  * avoid starvation in the software interrupt handler in
 611                  * large systems.
 612                  */
 613                 splbreaknum = 100;
 614
 615                 ccb = (union ccb *)addr;
 616
 617                 base_periph_found = 0;
 618
 619                 /*
 620                  * Sanity check -- make sure we don't get a null peripheral
 621                  * driver name.
 622                  */
 623                 if (*ccb->cgdl.periph_name == '\0') {
 624                         error = EINVAL;
 625                         break;
 626                 }
 627
 628                 /* Keep the list from changing while we traverse it */
 629                 mtx_lock(&xsoftc.xpt_topo_lock);
 630 ptstartover:
 631                 cur_generation = xsoftc.xpt_generation;
 632
 633                 /* first find our driver in the list of drivers */
 634                 for (p_drv = periph_drivers; *p_drv != NULL; p_drv++)
 635                         if (strcmp((*p_drv)->driver_name, name) == 0)
 636                                 break;
 637
 638                 if (*p_drv == NULL) {
 639                         mtx_unlock(&xsoftc.xpt_topo_lock);
 640                         ccb->ccb_h.status = CAM_REQ_CMP_ERR;
 641                         ccb->cgdl.status = CAM_GDEVLIST_ERROR;
 642                         *ccb->cgdl.periph_name = '\0';
 643                         ccb->cgdl.unit_number = 0;
 644                         error = ENOENT;
 645                         break;
 646                 }
 647
 648                 /*
 649                  * Run through every peripheral instance of this driver
 650                  * and check to see whether it matches the unit passed
 651                  * in by the user.  If it does, get out of the loops and
 652                  * find the passthrough driver associated with that
 653                  * peripheral driver.
 654                  */
 655                 for (periph = TAILQ_FIRST(&(*p_drv)->units); periph != NULL;
 656                      periph = TAILQ_NEXT(periph, unit_links)) {
 657
 658                         if (periph->unit_number == unit) {
 659                                 break;
 660                         } else if (--splbreaknum == 0) {
 661                                 mtx_unlock(&xsoftc.xpt_topo_lock);
 662                                 mtx_lock(&xsoftc.xpt_topo_lock);
 663                                 splbreaknum = 100;
 664                                 if (cur_generation != xsoftc.xpt_generation)
 665                                        goto ptstartover;
 666                         }
 667                 }
 668                 /*
 669                  * If we found the peripheral driver that the user passed
 670                  * in, go through all of the peripheral drivers for that
 671                  * particular device and look for a passthrough driver.
 672                  */
 673                 if (periph != NULL) {
 674                         struct cam_ed *device;
 675                         int i;
 676
 677                         base_periph_found = 1;
 678                         device = periph->path->device;
 679                         for (i = 0, periph = SLIST_FIRST(&device->periphs);
 680                              periph != NULL;
 681                              periph = SLIST_NEXT(periph, periph_links), i++) {
 682                                 /*
 683                                  * Check to see whether we have a
 684                                  * passthrough device or not.
 685                                  */
 686                                 if (strcmp(periph->periph_name, "pass") == 0) {
 687                                         /*
 688                                          * Fill in the getdevlist fields.
 689                                          */
 690                                         strcpy(ccb->cgdl.periph_name,
 691                                                periph->periph_name);
 692                                         ccb->cgdl.unit_number =
 693                                                 periph->unit_number;
 694                                         if (SLIST_NEXT(periph, periph_links))
 695                                                 ccb->cgdl.status =
 696                                                         CAM_GDEVLIST_MORE_DEVS;
 697                                         else
 698                                                 ccb->cgdl.status =
 699                                                        CAM_GDEVLIST_LAST_DEVICE;
 700                                         ccb->cgdl.generation =
 701                                                 device->generation;
 702                                         ccb->cgdl.index = i;
 703                                         /*
 704                                          * Fill in some CCB header fields
 705                                          * that the user may want.
 706                                          */
 707                                         ccb->ccb_h.path_id =
 708                                                 periph->path->bus->path_id;
 709                                         ccb->ccb_h.target_id =
 710                                                 periph->path->target->target_id;
 711                                         ccb->ccb_h.target_lun =
 712                                                 periph->path->device->lun_id;
 713                                         ccb->ccb_h.status = CAM_REQ_CMP;
 714                                         break;
 715                                 }
 716                         }
 717                 }
 718
 719                 /*
 720                  * If the periph is null here, one of two things has
 721                  * happened.  The first possibility is that we couldn't
 722                  * find the unit number of the particular peripheral driver
 723                  * that the user is asking about.  e.g. the user asks for
 724                  * the passthrough driver for "da11".  We find the list of
 725                  * "da" peripherals all right, but there is no unit 11.
 726                  * The other possibility is that we went through the list
 727                  * of peripheral drivers attached to the device structure,
 728                  * but didn't find one with the name "pass".  Either way,
 729                  * we return ENOENT, since we couldn't find something.
 730                  */
 731                 if (periph == NULL) {
 732                         ccb->ccb_h.status = CAM_REQ_CMP_ERR;
 733                         ccb->cgdl.status = CAM_GDEVLIST_ERROR;
 734                         *ccb->cgdl.periph_name = '\0';
 735                         ccb->cgdl.unit_number = 0;
 736                         error = ENOENT;
 737                         /*
 738                          * It is unfortunate that this is even necessary,
 739                          * but there are many, many clueless users out there.
 740                          * If this is true, the user is looking for the
 741                          * passthrough driver, but doesn't have one in his
 742                          * kernel.
 743                          */
 744                         if (base_periph_found == 1) {
 745                                 printf("xptioctl: pass driver is not in the "
 746                                        "kernel\n");
 747                                 printf("xptioctl: put \"device pass\" in "
 748                                        "your kernel config file\n");
 749                         }
 750                 }
 751                 mtx_unlock(&xsoftc.xpt_topo_lock);
 752                 break;
 753                 }
 754         default:
 755                 error = ENOTTY;
 756                 break;
 757         }
 758
 759         return(error);
 760 }
 761
 762 static int
 763 cam_module_event_handler(module_t mod, int what, void *arg)
 764 {
 765         int error;
 766
 767         switch (what) {
 768         case MOD_LOAD:
 769                 if ((error = xpt_init(NULL)) != 0)
 770                         return (error);
 771                 break;
 772         case MOD_UNLOAD:
 773                 return EBUSY;
 774         default:
 775                 return EOPNOTSUPP;
 776         }
 777
 778         return 0;
 779 }
 780
 781 /* thread to handle bus rescans */
 782 static void
 783 xpt_scanner_thread(void *dummy)
 784 {
 785         cam_isrq_t      queue;
 786         union ccb       *ccb;
 787         struct cam_sim  *sim;
 788
 789         for (;;) {
 790                 /*
 791                  * Wait for a rescan request to come in.  When it does, splice
 792                  * it onto a queue from local storage so that the xpt lock
 793                  * doesn't need to be held while the requests are being
 794                  * processed.
 795                  */
 796                 xpt_lock_buses();
 797                 msleep(&xsoftc.ccb_scanq, &xsoftc.xpt_topo_lock, PRIBIO,
 798                     "ccb_scanq", 0);
 799                 TAILQ_INIT(&queue);
 800                 TAILQ_CONCAT(&queue, &xsoftc.ccb_scanq, sim_links.tqe);
 801                 xpt_unlock_buses();
 802
 803                 while ((ccb = (union ccb *)TAILQ_FIRST(&queue)) != NULL) {
 804                         TAILQ_REMOVE(&queue, &ccb->ccb_h, sim_links.tqe);
 805
 806                         sim = ccb->ccb_h.path->bus->sim;
 807                         CAM_SIM_LOCK(sim);
 808
 809                         ccb->ccb_h.func_code = XPT_SCAN_BUS;
 810                         ccb->ccb_h.cbfcnp = xptdone;
 811                         xpt_setup_ccb(&ccb->ccb_h, ccb->ccb_h.path, 5);
 812                         cam_periph_runccb(ccb, NULL, 0, 0, NULL);
 813                         xpt_free_path(ccb->ccb_h.path);
 814                         xpt_free_ccb(ccb);
 815                         CAM_SIM_UNLOCK(sim);
 816                 }
 817         }
 818 }
 819
 820 void
 821 xpt_rescan(union ccb *ccb)
 822 {
 823         struct ccb_hdr *hdr;
 824
 825         /*
 826          * Don't make duplicate entries for the same paths.
 827          */
 828         xpt_lock_buses();
 829         TAILQ_FOREACH(hdr, &xsoftc.ccb_scanq, sim_links.tqe) {
 830                 if (xpt_path_comp(hdr->path, ccb->ccb_h.path) == 0) {
 831                         xpt_unlock_buses();
 832                         xpt_print(ccb->ccb_h.path, "rescan already queued\n");
 833                         xpt_free_path(ccb->ccb_h.path);
 834                         xpt_free_ccb(ccb);
 835                         return;
 836                 }
 837         }
 838         TAILQ_INSERT_TAIL(&xsoftc.ccb_scanq, &ccb->ccb_h, sim_links.tqe);
 839         wakeup(&xsoftc.ccb_scanq);
 840         xpt_unlock_buses();
 841 }
 842
 843 /* Functions accessed by the peripheral drivers */
 844 static int
 845 xpt_init(void *dummy)
 846 {
 847         struct cam_sim *xpt_sim;
 848         struct cam_path *path;
 849         struct cam_devq *devq;
 850         cam_status status;
 851
 852         TAILQ_INIT(&xsoftc.xpt_busses);
 853         TAILQ_INIT(&cam_simq);
 854         TAILQ_INIT(&xsoftc.ccb_scanq);
 855         STAILQ_INIT(&xsoftc.highpowerq);
 856         xsoftc.num_highpower = CAM_MAX_HIGHPOWER;
 857
 858         mtx_init(&cam_simq_lock, "CAM SIMQ lock", NULL, MTX_DEF);
 859         mtx_init(&xsoftc.xpt_lock, "XPT lock", NULL, MTX_DEF);
 860         mtx_init(&xsoftc.xpt_topo_lock, "XPT topology lock", NULL, MTX_DEF);
 861
 862         /*
 863          * The xpt layer is, itself, the equivelent of a SIM.
 864          * Allow 16 ccbs in the ccb pool for it.  This should
 865          * give decent parallelism when we probe busses and
 866          * perform other XPT functions.
 867          */
 868         devq = cam_simq_alloc(16);
 869         xpt_sim = cam_sim_alloc(xptaction,
 870                                 xptpoll,
 871                                 "xpt",
 872                                 /*softc*/NULL,
 873                                 /*unit*/0,
 874                                 /*mtx*/&xsoftc.xpt_lock,
 875                                 /*max_dev_transactions*/0,
 876                                 /*max_tagged_dev_transactions*/0,
 877                                 devq);
 878         if (xpt_sim == NULL)
 879                 return (ENOMEM);
 880
 881         xpt_sim->max_ccbs = 16;
 882
 883         mtx_lock(&xsoftc.xpt_lock);
 884         if ((status = xpt_bus_register(xpt_sim, NULL, 0)) != CAM_SUCCESS) {
 885                 printf("xpt_init: xpt_bus_register failed with status %#x,"
 886                        " failing attach\n", status);
 887                 return (EINVAL);
 888         }
 889
 890         /*
 891          * Looking at the XPT from the SIM layer, the XPT is
 892          * the equivelent of a peripheral driver.  Allocate
 893          * a peripheral driver entry for us.
 894          */
 895         if ((status = xpt_create_path(&path, NULL, CAM_XPT_PATH_ID,
 896                                       CAM_TARGET_WILDCARD,
 897                                       CAM_LUN_WILDCARD)) != CAM_REQ_CMP) {
 898                 printf("xpt_init: xpt_create_path failed with status %#x,"
 899                        " failing attach\n", status);
 900                 return (EINVAL);
 901         }
 902
 903         cam_periph_alloc(xptregister, NULL, NULL, NULL, "xpt", CAM_PERIPH_BIO,
 904                          path, NULL, 0, xpt_sim);
 905         xpt_free_path(path);
 906         mtx_unlock(&xsoftc.xpt_lock);
 907
 908         /*
 909          * Register a callback for when interrupts are enabled.
 910          */
 911         xsoftc.xpt_config_hook =
 912             (struct intr_config_hook *)malloc(sizeof(struct intr_config_hook),
 913                                               M_CAMXPT, M_NOWAIT | M_ZERO);
 914         if (xsoftc.xpt_config_hook == NULL) {
 915                 printf("xpt_init: Cannot malloc config hook "
 916                        "- failing attach\n");
 917                 return (ENOMEM);
 918         }
 919
 920         xsoftc.xpt_config_hook->ich_func = xpt_config;
 921         if (config_intrhook_establish(xsoftc.xpt_config_hook) != 0) {
 922                 free (xsoftc.xpt_config_hook, M_CAMXPT);
 923                 printf("xpt_init: config_intrhook_establish failed "
 924                        "- failing attach\n");
 925         }
 926
 927         /* fire up rescan thread */
 928         if (kproc_create(xpt_scanner_thread, NULL, NULL, 0, 0, "xpt_thrd")) {
 929                 printf("xpt_init: failed to create rescan thread\n");
 930         }
 931         /* Install our software interrupt handlers */
 932         swi_add(NULL, "cambio", camisr, NULL, SWI_CAMBIO, INTR_MPSAFE, &cambio_ih);
 933
 934         return (0);
 935 }
 936
 937 static cam_status
 938 xptregister(struct cam_periph *periph, void *arg)
 939 {
 940         struct cam_sim *xpt_sim;
 941
 942         if (periph == NULL) {
 943                 printf("xptregister: periph was NULL!!\n");
 944                 return(CAM_REQ_CMP_ERR);
 945         }
 946
 947         xpt_sim = (struct cam_sim *)arg;
 948         xpt_sim->softc = periph;
 949         xpt_periph = periph;
 950         periph->softc = NULL;
 951
 952         return(CAM_REQ_CMP);
 953 }
 954
 955 int32_t
 956 xpt_add_periph(struct cam_periph *periph)
 957 {
 958         struct cam_ed *device;
 959         int32_t  status;
 960         struct periph_list *periph_head;
 961
 962         mtx_assert(periph->sim->mtx, MA_OWNED);
 963
 964         device = periph->path->device;
 965
 966         periph_head = &device->periphs;
 967
 968         status = CAM_REQ_CMP;
 969
 970         if (device != NULL) {
 971                 /*
 972                  * Make room for this peripheral
 973                  * so it will fit in the queue
 974                  * when it's scheduled to run
 975                  */
 976                 status = camq_resize(&device->drvq,
 977                                      device->drvq.array_size + 1);
 978
 979                 device->generation++;
 980
 981                 SLIST_INSERT_HEAD(periph_head, periph, periph_links);
 982         }
 983
 984         mtx_lock(&xsoftc.xpt_topo_lock);
 985         xsoftc.xpt_generation++;
 986         mtx_unlock(&xsoftc.xpt_topo_lock);
 987
 988         return (status);
 989 }
 990
 991 void
 992 xpt_remove_periph(struct cam_periph *periph)
 993 {
 994         struct cam_ed *device;
 995
 996         mtx_assert(periph->sim->mtx, MA_OWNED);
 997
 998         device = periph->path->device;
 999
1000         if (device != NULL) {
1001                 struct periph_list *periph_head;
1002
1003                 periph_head = &device->periphs;
1004
1005                 /* Release the slot for this peripheral */
1006                 camq_resize(&device->drvq, device->drvq.array_size - 1);
1007
1008                 device->generation++;
1009
1010                 SLIST_REMOVE(periph_head, periph, cam_periph, periph_links);
1011         }
1012
1013         mtx_lock(&xsoftc.xpt_topo_lock);
1014         xsoftc.xpt_generation++;
1015         mtx_unlock(&xsoftc.xpt_topo_lock);
1016 }
1017
1018
1019 void
1020 xpt_announce_periph(struct cam_periph *periph, char *announce_string)
1021 {
1022         struct  ccb_pathinq cpi;
1023         struct  ccb_trans_settings cts;
1024         struct  cam_path *path;
1025         u_int   speed;
1026         u_int   freq;
1027         u_int   mb;
1028
1029         mtx_assert(periph->sim->mtx, MA_OWNED);
1030
1031         path = periph->path;
1032         /*
1033          * To ensure that this is printed in one piece,
1034          * mask out CAM interrupts.
1035          */
1036         printf("%s%d at %s%d bus %d target %d lun %d\n",
1037                periph->periph_name, periph->unit_number,
1038                path->bus->sim->sim_name,
1039                path->bus->sim->unit_number,
1040                path->bus->sim->bus_id,
1041                path->target->target_id,
1042                path->device->lun_id);
1043         printf("%s%d: ", periph->periph_name, periph->unit_number);
1044         if (path->device->protocol == PROTO_SCSI)
1045             scsi_print_inquiry(&path->device->inq_data);
1046         else if (path->device->protocol == PROTO_ATA ||
1047             path->device->protocol == PROTO_SATAPM)
1048                 ata_print_ident(&path->device->ident_data);
1049         else
1050             printf("Unknown protocol device\n");
1051         if (bootverbose && path->device->serial_num_len > 0) {
1052                 /* Don't wrap the screen  - print only the first 60 chars */
1053                 printf("%s%d: Serial Number %.60s\n", periph->periph_name,
1054                        periph->unit_number, path->device->serial_num);
1055         }
1056         xpt_setup_ccb(&cts.ccb_h, path, /*priority*/1);
1057         cts.ccb_h.func_code = XPT_GET_TRAN_SETTINGS;
1058         cts.type = CTS_TYPE_CURRENT_SETTINGS;
1059         xpt_action((union ccb*)&cts);
1060         if ((cts.ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_CMP) {
1061                 return;
1062         }
1063
1064         /* Ask the SIM for its base transfer speed */
1065         xpt_setup_ccb(&cpi.ccb_h, path, /*priority*/1);
1066         cpi.ccb_h.func_code = XPT_PATH_INQ;
1067         xpt_action((union ccb *)&cpi);
1068
1069         speed = cpi.base_transfer_speed;
1070         freq = 0;
1071         if (cts.ccb_h.status == CAM_REQ_CMP && cts.transport == XPORT_SPI) {
1072                 struct  ccb_trans_settings_spi *spi;
1073
1074                 spi = &cts.xport_specific.spi;
1075                 if ((spi->valid & CTS_SPI_VALID_SYNC_OFFSET) != 0
1076                   && spi->sync_offset != 0) {
1077                         freq = scsi_calc_syncsrate(spi->sync_period);
1078                         speed = freq;
1079                 }
1080
1081                 if ((spi->valid & CTS_SPI_VALID_BUS_WIDTH) != 0)
1082                         speed *= (0x01 << spi->bus_width);
1083         }
1084         if (cts.ccb_h.status == CAM_REQ_CMP && cts.transport == XPORT_FC) {
1085                 struct  ccb_trans_settings_fc *fc = &cts.xport_specific.fc;
1086                 if (fc->valid & CTS_FC_VALID_SPEED)
1087                         speed = fc->bitrate;
1088         }
1089         if (cts.ccb_h.status == CAM_REQ_CMP && cts.transport == XPORT_SAS) {
1090                 struct  ccb_trans_settings_sas *sas = &cts.xport_specific.sas;
1091                 if (sas->valid & CTS_SAS_VALID_SPEED)
1092                         speed = sas->bitrate;
1093         }
1094         if (cts.ccb_h.status == CAM_REQ_CMP && cts.transport == XPORT_SATA) {
1095                 struct  ccb_trans_settings_sata *sata = &cts.xport_specific.sata;
1096                 if (sata->valid & CTS_SATA_VALID_SPEED)
1097                         speed = sata->bitrate;
1098         }
1099
1100         mb = speed / 1000;
1101         if (mb > 0)
1102                 printf("%s%d: %d.%03dMB/s transfers",
1103                        periph->periph_name, periph->unit_number,
1104                        mb, speed % 1000);
1105         else
1106                 printf("%s%d: %dKB/s transfers", periph->periph_name,
1107                        periph->unit_number, speed);
1108         /* Report additional information about SPI connections */
1109         if (cts.ccb_h.status == CAM_REQ_CMP && cts.transport == XPORT_SPI) {
1110                 struct  ccb_trans_settings_spi *spi;
1111
1112                 spi = &cts.xport_specific.spi;
1113                 if (freq != 0) {
1114                         printf(" (%d.%03dMHz%s, offset %d", freq / 1000,
1115                                freq % 1000,
1116                                (spi->ppr_options & MSG_EXT_PPR_DT_REQ) != 0
1117                              ? " DT" : "",
1118                                spi->sync_offset);
1119                 }
1120                 if ((spi->valid & CTS_SPI_VALID_BUS_WIDTH) != 0
1121                  && spi->bus_width > 0) {
1122                         if (freq != 0) {
1123                                 printf(", ");
1124                         } else {
1125                                 printf(" (");
1126                         }
1127                         printf("%dbit)", 8 * (0x01 << spi->bus_width));
1128                 } else if (freq != 0) {
1129                         printf(")");
1130                 }
1131         }
1132         if (cts.ccb_h.status == CAM_REQ_CMP && cts.transport == XPORT_FC) {
1133                 struct  ccb_trans_settings_fc *fc;
1134
1135                 fc = &cts.xport_specific.fc;
1136                 if (fc->valid & CTS_FC_VALID_WWNN)
1137                         printf(" WWNN 0x%llx", (long long) fc->wwnn);
1138                 if (fc->valid & CTS_FC_VALID_WWPN)
1139                         printf(" WWPN 0x%llx", (long long) fc->wwpn);
1140                 if (fc->valid & CTS_FC_VALID_PORT)
1141                         printf(" PortID 0x%x", fc->port);
1142         }
1143
1144         if (path->device->inq_flags & SID_CmdQue
1145          || path->device->flags & CAM_DEV_TAG_AFTER_COUNT) {
1146                 printf("\n%s%d: Command Queueing enabled",
1147                        periph->periph_name, periph->unit_number);
1148         }
1149         printf("\n");
1150
1151         /*
1152          * We only want to print the caller's announce string if they've
1153          * passed one in..
1154          */
1155         if (announce_string != NULL)
1156                 printf("%s%d: %s\n", periph->periph_name,
1157                        periph->unit_number, announce_string);
1158 }
1159
1160 static dev_match_ret
1161 xptbusmatch(struct dev_match_pattern *patterns, u_int num_patterns,
1162             struct cam_eb *bus)
1163 {
1164         dev_match_ret retval;
1165         int i;
1166
1167         retval = DM_RET_NONE;
1168
1169         /*
1170          * If we aren't given something to match against, that's an error.
1171          */
1172         if (bus == NULL)
1173                 return(DM_RET_ERROR);
1174
1175         /*
1176          * If there are no match entries, then this bus matches no
1177          * matter what.
1178          */
1179         if ((patterns == NULL) || (num_patterns == 0))
1180                 return(DM_RET_DESCEND | DM_RET_COPY);
1181
1182         for (i = 0; i < num_patterns; i++) {
1183                 struct bus_match_pattern *cur_pattern;
1184
1185                 /*
1186                  * If the pattern in question isn't for a bus node, we
1187                  * aren't interested.  However, we do indicate to the
1188                  * calling routine that we should continue descending the
1189                  * tree, since the user wants to match against lower-level
1190                  * EDT elements.
1191                  */
1192                 if (patterns[i].type != DEV_MATCH_BUS) {
1193                         if ((retval & DM_RET_ACTION_MASK) == DM_RET_NONE)
1194                                 retval |= DM_RET_DESCEND;
1195                         continue;
1196                 }
1197
1198                 cur_pattern = &patterns[i].pattern.bus_pattern;
1199
1200                 /*
1201                  * If they want to match any bus node, we give them any
1202                  * device node.
1203                  */
1204                 if (cur_pattern->flags == BUS_MATCH_ANY) {
1205                         /* set the copy flag */
1206                         retval |= DM_RET_COPY;
1207
1208                         /*
1209                          * If we've already decided on an action, go ahead
1210                          * and return.
1211                          */
1212                         if ((retval & DM_RET_ACTION_MASK) != DM_RET_NONE)
1213                                 return(retval);
1214                 }
1215
1216                 /*
1217                  * Not sure why someone would do this...
1218                  */
1219                 if (cur_pattern->flags == BUS_MATCH_NONE)
1220                         continue;
1221
1222                 if (((cur_pattern->flags & BUS_MATCH_PATH) != 0)
1223                  && (cur_pattern->path_id != bus->path_id))
1224                         continue;
1225
1226                 if (((cur_pattern->flags & BUS_MATCH_BUS_ID) != 0)
1227                  && (cur_pattern->bus_id != bus->sim->bus_id))
1228                         continue;
1229
1230                 if (((cur_pattern->flags & BUS_MATCH_UNIT) != 0)
1231                  && (cur_pattern->unit_number != bus->sim->unit_number))
1232                         continue;
1233
1234                 if (((cur_pattern->flags & BUS_MATCH_NAME) != 0)
1235                  && (strncmp(cur_pattern->dev_name, bus->sim->sim_name,
1236                              DEV_IDLEN) != 0))
1237                         continue;
1238
1239                 /*
1240                  * If we get to this point, the user definitely wants
1241                  * information on this bus.  So tell the caller to copy the
1242                  * data out.
1243                  */
1244                 retval |= DM_RET_COPY;
1245
1246                 /*
1247                  * If the return action has been set to descend, then we
1248                  * know that we've already seen a non-bus matching
1249                  * expression, therefore we need to further descend the tree.
1250                  * This won't change by continuing around the loop, so we
1251                  * go ahead and return.  If we haven't seen a non-bus
1252                  * matching expression, we keep going around the loop until
1253                  * we exhaust the matching expressions.  We'll set the stop
1254                  * flag once we fall out of the loop.
1255                  */
1256                 if ((retval & DM_RET_ACTION_MASK) == DM_RET_DESCEND)
1257                         return(retval);
1258         }
1259
1260         /*
1261          * If the return action hasn't been set to descend yet, that means
1262          * we haven't seen anything other than bus matching patterns.  So
1263          * tell the caller to stop descending the tree -- the user doesn't
1264          * want to match against lower level tree elements.
1265          */
1266         if ((retval & DM_RET_ACTION_MASK) == DM_RET_NONE)
1267                 retval |= DM_RET_STOP;
1268
1269         return(retval);
1270 }
1271
1272 static dev_match_ret
1273 xptdevicematch(struct dev_match_pattern *patterns, u_int num_patterns,
1274                struct cam_ed *device)
1275 {
1276         dev_match_ret retval;
1277         int i;
1278
1279         retval = DM_RET_NONE;
1280
1281         /*
1282          * If we aren't given something to match against, that's an error.
1283          */
1284         if (device == NULL)
1285                 return(DM_RET_ERROR);
1286
1287         /*
1288          * If there are no match entries, then this device matches no
1289          * matter what.
1290          */
1291         if ((patterns == NULL) || (num_patterns == 0))
1292                 return(DM_RET_DESCEND | DM_RET_COPY);
1293
1294         for (i = 0; i < num_patterns; i++) {
1295                 struct device_match_pattern *cur_pattern;
1296
1297                 /*
1298                  * If the pattern in question isn't for a device node, we
1299                  * aren't interested.
1300                  */
1301                 if (patterns[i].type != DEV_MATCH_DEVICE) {
1302                         if ((patterns[i].type == DEV_MATCH_PERIPH)
1303                          && ((retval & DM_RET_ACTION_MASK) == DM_RET_NONE))
1304                                 retval |= DM_RET_DESCEND;
1305                         continue;
1306                 }
1307
1308                 cur_pattern = &patterns[i].pattern.device_pattern;
1309
1310                 /*
1311                  * If they want to match any device node, we give them any
1312                  * device node.
1313                  */
1314                 if (cur_pattern->flags == DEV_MATCH_ANY) {
1315                         /* set the copy flag */
1316                         retval |= DM_RET_COPY;
1317
1318
1319                         /*
1320                          * If we've already decided on an action, go ahead
1321                          * and return.
1322                          */
1323                         if ((retval & DM_RET_ACTION_MASK) != DM_RET_NONE)
1324                                 return(retval);
1325                 }
1326
1327                 /*
1328                  * Not sure why someone would do this...
1329                  */
1330                 if (cur_pattern->flags == DEV_MATCH_NONE)
1331                         continue;
1332
1333                 if (((cur_pattern->flags & DEV_MATCH_PATH) != 0)
1334                  && (cur_pattern->path_id != device->target->bus->path_id))
1335                         continue;
1336
1337                 if (((cur_pattern->flags & DEV_MATCH_TARGET) != 0)
1338                  && (cur_pattern->target_id != device->target->target_id))
1339                         continue;
1340
1341                 if (((cur_pattern->flags & DEV_MATCH_LUN) != 0)
1342                  && (cur_pattern->target_lun != device->lun_id))
1343                         continue;
1344
1345                 if (((cur_pattern->flags & DEV_MATCH_INQUIRY) != 0)
1346                  && (cam_quirkmatch((caddr_t)&device->inq_data,
1347                                     (caddr_t)&cur_pattern->inq_pat,
1348                                     1, sizeof(cur_pattern->inq_pat),
1349                                     scsi_static_inquiry_match) == NULL))
1350                         continue;
1351
1352                 /*
1353                  * If we get to this point, the user definitely wants
1354                  * information on this device.  So tell the caller to copy
1355                  * the data out.
1356                  */
1357                 retval |= DM_RET_COPY;
1358
1359                 /*
1360                  * If the return action has been set to descend, then we
1361                  * know that we've already seen a peripheral matching
1362                  * expression, therefore we need to further descend the tree.
1363                  * This won't change by continuing around the loop, so we
1364                  * go ahead and return.  If we haven't seen a peripheral
1365                  * matching expression, we keep going around the loop until
1366                  * we exhaust the matching expressions.  We'll set the stop
1367                  * flag once we fall out of the loop.
1368                  */
1369                 if ((retval & DM_RET_ACTION_MASK) == DM_RET_DESCEND)
1370                         return(retval);
1371         }
1372
1373         /*
1374          * If the return action hasn't been set to descend yet, that means
1375          * we haven't seen any peripheral matching patterns.  So tell the
1376          * caller to stop descending the tree -- the user doesn't want to
1377          * match against lower level tree elements.
1378          */
1379         if ((retval & DM_RET_ACTION_MASK) == DM_RET_NONE)
1380                 retval |= DM_RET_STOP;
1381
1382         return(retval);
1383 }
1384
1385 /*
1386  * Match a single peripheral against any number of match patterns.
1387  */
1388 static dev_match_ret
1389 xptperiphmatch(struct dev_match_pattern *patterns, u_int num_patterns,
1390                struct cam_periph *periph)
1391 {
1392         dev_match_ret retval;
1393         int i;
1394
1395         /*
1396          * If we aren't given something to match against, that's an error.
1397          */
1398         if (periph == NULL)
1399                 return(DM_RET_ERROR);
1400
1401         /*
1402          * If there are no match entries, then this peripheral matches no
1403          * matter what.
1404          */
1405         if ((patterns == NULL) || (num_patterns == 0))
1406                 return(DM_RET_STOP | DM_RET_COPY);
1407
1408         /*
1409          * There aren't any nodes below a peripheral node, so there's no
1410          * reason to descend the tree any further.
1411          */
1412         retval = DM_RET_STOP;
1413
1414         for (i = 0; i < num_patterns; i++) {
1415                 struct periph_match_pattern *cur_pattern;
1416
1417                 /*
1418                  * If the pattern in question isn't for a peripheral, we
1419                  * aren't interested.
1420                  */
1421                 if (patterns[i].type != DEV_MATCH_PERIPH)
1422                         continue;
1423
1424                 cur_pattern = &patterns[i].pattern.periph_pattern;
1425
1426                 /*
1427                  * If they want to match on anything, then we will do so.
1428                  */
1429                 if (cur_pattern->flags == PERIPH_MATCH_ANY) {
1430                         /* set the copy flag */
1431                         retval |= DM_RET_COPY;
1432
1433                         /*
1434                          * We've already set the return action to stop,
1435                          * since there are no nodes below peripherals in
1436                          * the tree.
1437                          */
1438                         return(retval);
1439                 }
1440
1441                 /*
1442                  * Not sure why someone would do this...
1443                  */
1444                 if (cur_pattern->flags == PERIPH_MATCH_NONE)
1445                         continue;
1446
1447                 if (((cur_pattern->flags & PERIPH_MATCH_PATH) != 0)
1448                  && (cur_pattern->path_id != periph->path->bus->path_id))
1449                         continue;
1450
1451                 /*
1452                  * For the target and lun id's, we have to make sure the
1453                  * target and lun pointers aren't NULL.  The xpt peripheral
1454                  * has a wildcard target and device.
1455                  */
1456                 if (((cur_pattern->flags & PERIPH_MATCH_TARGET) != 0)
1457                  && ((periph->path->target == NULL)
1458                  ||(cur_pattern->target_id != periph->path->target->target_id)))
1459                         continue;
1460
1461                 if (((cur_pattern->flags & PERIPH_MATCH_LUN) != 0)
1462                  && ((periph->path->device == NULL)
1463                  || (cur_pattern->target_lun != periph->path->device->lun_id)))
1464                         continue;
1465
1466                 if (((cur_pattern->flags & PERIPH_MATCH_UNIT) != 0)
1467                  && (cur_pattern->unit_number != periph->unit_number))
1468                         continue;
1469
1470                 if (((cur_pattern->flags & PERIPH_MATCH_NAME) != 0)
1471                  && (strncmp(cur_pattern->periph_name, periph->periph_name,
1472                              DEV_IDLEN) != 0))
1473                         continue;
1474
1475                 /*
1476                  * If we get to this point, the user definitely wants
1477                  * information on this peripheral.  So tell the caller to
1478                  * copy the data out.
1479                  */
1480                 retval |= DM_RET_COPY;
1481
1482                 /*
1483                  * The return action has already been set to stop, since
1484                  * peripherals don't have any nodes below them in the EDT.
1485                  */
1486                 return(retval);
1487         }
1488
1489         /*
1490          * If we get to this point, the peripheral that was passed in
1491          * doesn't match any of the patterns.
1492          */
1493         return(retval);
1494 }
1495
1496 static int
1497 xptedtbusfunc(struct cam_eb *bus, void *arg)
1498 {
1499         struct ccb_dev_match *cdm;
1500         dev_match_ret retval;
1501
1502         cdm = (struct ccb_dev_match *)arg;
1503
1504         /*
1505          * If our position is for something deeper in the tree, that means
1506          * that we've already seen this node.  So, we keep going down.
1507          */
1508         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
1509          && (cdm->pos.cookie.bus == bus)
1510          && (cdm->pos.position_type & CAM_DEV_POS_TARGET)
1511          && (cdm->pos.cookie.target != NULL))
1512                 retval = DM_RET_DESCEND;
1513         else
1514                 retval = xptbusmatch(cdm->patterns, cdm->num_patterns, bus);
1515
1516         /*
1517          * If we got an error, bail out of the search.
1518          */
1519         if ((retval & DM_RET_ACTION_MASK) == DM_RET_ERROR) {
1520                 cdm->status = CAM_DEV_MATCH_ERROR;
1521                 return(0);
1522         }
1523
1524         /*
1525          * If the copy flag is set, copy this bus out.
1526          */
1527         if (retval & DM_RET_COPY) {
1528                 int spaceleft, j;
1529
1530                 spaceleft = cdm->match_buf_len - (cdm->num_matches *
1531                         sizeof(struct dev_match_result));
1532
1533                 /*
1534                  * If we don't have enough space to put in another
1535                  * match result, save our position and tell the
1536                  * user there are more devices to check.
1537                  */
1538                 if (spaceleft < sizeof(struct dev_match_result)) {
1539                         bzero(&cdm->pos, sizeof(cdm->pos));
1540                         cdm->pos.position_type =
1541                                 CAM_DEV_POS_EDT | CAM_DEV_POS_BUS;
1542
1543                         cdm->pos.cookie.bus = bus;
1544                         cdm->pos.generations[CAM_BUS_GENERATION]=
1545                                 xsoftc.bus_generation;
1546                         cdm->status = CAM_DEV_MATCH_MORE;
1547                         return(0);
1548                 }
1549                 j = cdm->num_matches;
1550                 cdm->num_matches++;
1551                 cdm->matches[j].type = DEV_MATCH_BUS;
1552                 cdm->matches[j].result.bus_result.path_id = bus->path_id;
1553                 cdm->matches[j].result.bus_result.bus_id = bus->sim->bus_id;
1554                 cdm->matches[j].result.bus_result.unit_number =
1555                         bus->sim->unit_number;
1556                 strncpy(cdm->matches[j].result.bus_result.dev_name,
1557                         bus->sim->sim_name, DEV_IDLEN);
1558         }
1559
1560         /*
1561          * If the user is only interested in busses, there's no
1562          * reason to descend to the next level in the tree.
1563          */
1564         if ((retval & DM_RET_ACTION_MASK) == DM_RET_STOP)
1565                 return(1);
1566
1567         /*
1568          * If there is a target generation recorded, check it to
1569          * make sure the target list hasn't changed.
1570          */
1571         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
1572          && (bus == cdm->pos.cookie.bus)
1573          && (cdm->pos.position_type & CAM_DEV_POS_TARGET)
1574          && (cdm->pos.generations[CAM_TARGET_GENERATION] != 0)
1575          && (cdm->pos.generations[CAM_TARGET_GENERATION] !=
1576              bus->generation)) {
1577                 cdm->status = CAM_DEV_MATCH_LIST_CHANGED;
1578                 return(0);
1579         }
1580
1581         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
1582          && (cdm->pos.cookie.bus == bus)
1583          && (cdm->pos.position_type & CAM_DEV_POS_TARGET)
1584          && (cdm->pos.cookie.target != NULL))
1585                 return(xpttargettraverse(bus,
1586                                         (struct cam_et *)cdm->pos.cookie.target,
1587                                          xptedttargetfunc, arg));
1588         else
1589                 return(xpttargettraverse(bus, NULL, xptedttargetfunc, arg));
1590 }
1591
1592 static int
1593 xptedttargetfunc(struct cam_et *target, void *arg)
1594 {
1595         struct ccb_dev_match *cdm;
1596
1597         cdm = (struct ccb_dev_match *)arg;
1598
1599         /*
1600          * If there is a device list generation recorded, check it to
1601          * make sure the device list hasn't changed.
1602          */
1603         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
1604          && (cdm->pos.cookie.bus == target->bus)
1605          && (cdm->pos.position_type & CAM_DEV_POS_TARGET)
1606          && (cdm->pos.cookie.target == target)
1607          && (cdm->pos.position_type & CAM_DEV_POS_DEVICE)
1608          && (cdm->pos.generations[CAM_DEV_GENERATION] != 0)
1609          && (cdm->pos.generations[CAM_DEV_GENERATION] !=
1610              target->generation)) {
1611                 cdm->status = CAM_DEV_MATCH_LIST_CHANGED;
1612                 return(0);
1613         }
1614
1615         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
1616          && (cdm->pos.cookie.bus == target->bus)
1617          && (cdm->pos.position_type & CAM_DEV_POS_TARGET)
1618          && (cdm->pos.cookie.target == target)
1619          && (cdm->pos.position_type & CAM_DEV_POS_DEVICE)
1620          && (cdm->pos.cookie.device != NULL))
1621                 return(xptdevicetraverse(target,
1622                                         (struct cam_ed *)cdm->pos.cookie.device,
1623                                          xptedtdevicefunc, arg));
1624         else
1625                 return(xptdevicetraverse(target, NULL, xptedtdevicefunc, arg));
1626 }
1627
1628 static int
1629 xptedtdevicefunc(struct cam_ed *device, void *arg)
1630 {
1631
1632         struct ccb_dev_match *cdm;
1633         dev_match_ret retval;
1634
1635         cdm = (struct ccb_dev_match *)arg;
1636
1637         /*
1638          * If our position is for something deeper in the tree, that means
1639          * that we've already seen this node.  So, we keep going down.
1640          */
1641         if ((cdm->pos.position_type & CAM_DEV_POS_DEVICE)
1642          && (cdm->pos.cookie.device == device)
1643          && (cdm->pos.position_type & CAM_DEV_POS_PERIPH)
1644          && (cdm->pos.cookie.periph != NULL))
1645                 retval = DM_RET_DESCEND;
1646         else
1647                 retval = xptdevicematch(cdm->patterns, cdm->num_patterns,
1648                                         device);
1649
1650         if ((retval & DM_RET_ACTION_MASK) == DM_RET_ERROR) {
1651                 cdm->status = CAM_DEV_MATCH_ERROR;
1652                 return(0);
1653         }
1654
1655         /*
1656          * If the copy flag is set, copy this device out.
1657          */
1658         if (retval & DM_RET_COPY) {
1659                 int spaceleft, j;
1660
1661                 spaceleft = cdm->match_buf_len - (cdm->num_matches *
1662                         sizeof(struct dev_match_result));
1663
1664                 /*
1665                  * If we don't have enough space to put in another
1666                  * match result, save our position and tell the
1667                  * user there are more devices to check.
1668                  */
1669                 if (spaceleft < sizeof(struct dev_match_result)) {
1670                         bzero(&cdm->pos, sizeof(cdm->pos));
1671                         cdm->pos.position_type =
1672                                 CAM_DEV_POS_EDT | CAM_DEV_POS_BUS |
1673                                 CAM_DEV_POS_TARGET | CAM_DEV_POS_DEVICE;
1674
1675                         cdm->pos.cookie.bus = device->target->bus;
1676                         cdm->pos.generations[CAM_BUS_GENERATION]=
1677                                 xsoftc.bus_generation;
1678                         cdm->pos.cookie.target = device->target;
1679                         cdm->pos.generations[CAM_TARGET_GENERATION] =
1680                                 device->target->bus->generation;
1681                         cdm->pos.cookie.device = device;
1682                         cdm->pos.generations[CAM_DEV_GENERATION] =
1683                                 device->target->generation;
1684                         cdm->status = CAM_DEV_MATCH_MORE;
1685                         return(0);
1686                 }
1687                 j = cdm->num_matches;
1688                 cdm->num_matches++;
1689                 cdm->matches[j].type = DEV_MATCH_DEVICE;
1690                 cdm->matches[j].result.device_result.path_id =
1691                         device->target->bus->path_id;
1692                 cdm->matches[j].result.device_result.target_id =
1693                         device->target->target_id;
1694                 cdm->matches[j].result.device_result.target_lun =
1695                         device->lun_id;
1696                 cdm->matches[j].result.device_result.protocol =
1697                         device->protocol;
1698                 bcopy(&device->inq_data,
1699                       &cdm->matches[j].result.device_result.inq_data,
1700                       sizeof(struct scsi_inquiry_data));
1701                 bcopy(&device->ident_data,
1702                       &cdm->matches[j].result.device_result.ident_data,
1703                       sizeof(struct ata_params));
1704
1705                 /* Let the user know whether this device is unconfigured */
1706                 if (device->flags & CAM_DEV_UNCONFIGURED)
1707                         cdm->matches[j].result.device_result.flags =
1708                                 DEV_RESULT_UNCONFIGURED;
1709                 else
1710                         cdm->matches[j].result.device_result.flags =
1711                                 DEV_RESULT_NOFLAG;
1712         }
1713
1714         /*
1715          * If the user isn't interested in peripherals, don't descend
1716          * the tree any further.
1717          */
1718         if ((retval & DM_RET_ACTION_MASK) == DM_RET_STOP)
1719                 return(1);
1720
1721         /*
1722          * If there is a peripheral list generation recorded, make sure
1723          * it hasn't changed.
1724          */
1725         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
1726          && (device->target->bus == cdm->pos.cookie.bus)
1727          && (cdm->pos.position_type & CAM_DEV_POS_TARGET)
1728          && (device->target == cdm->pos.cookie.target)
1729          && (cdm->pos.position_type & CAM_DEV_POS_DEVICE)
1730          && (device == cdm->pos.cookie.device)
1731          && (cdm->pos.position_type & CAM_DEV_POS_PERIPH)
1732          && (cdm->pos.generations[CAM_PERIPH_GENERATION] != 0)
1733          && (cdm->pos.generations[CAM_PERIPH_GENERATION] !=
1734              device->generation)){
1735                 cdm->status = CAM_DEV_MATCH_LIST_CHANGED;
1736                 return(0);
1737         }
1738
1739         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
1740          && (cdm->pos.cookie.bus == device->target->bus)
1741          && (cdm->pos.position_type & CAM_DEV_POS_TARGET)
1742          && (cdm->pos.cookie.target == device->target)
1743          && (cdm->pos.position_type & CAM_DEV_POS_DEVICE)
1744          && (cdm->pos.cookie.device == device)
1745          && (cdm->pos.position_type & CAM_DEV_POS_PERIPH)
1746          && (cdm->pos.cookie.periph != NULL))
1747                 return(xptperiphtraverse(device,
1748                                 (struct cam_periph *)cdm->pos.cookie.periph,
1749                                 xptedtperiphfunc, arg));
1750         else
1751                 return(xptperiphtraverse(device, NULL, xptedtperiphfunc, arg));
1752 }
1753
1754 static int
1755 xptedtperiphfunc(struct cam_periph *periph, void *arg)
1756 {
1757         struct ccb_dev_match *cdm;
1758         dev_match_ret retval;
1759
1760         cdm = (struct ccb_dev_match *)arg;
1761
1762         retval = xptperiphmatch(cdm->patterns, cdm->num_patterns, periph);
1763
1764         if ((retval & DM_RET_ACTION_MASK) == DM_RET_ERROR) {
1765                 cdm->status = CAM_DEV_MATCH_ERROR;
1766                 return(0);
1767         }
1768
1769         /*
1770          * If the copy flag is set, copy this peripheral out.
1771          */
1772         if (retval & DM_RET_COPY) {
1773                 int spaceleft, j;
1774
1775                 spaceleft = cdm->match_buf_len - (cdm->num_matches *
1776                         sizeof(struct dev_match_result));
1777
1778                 /*
1779                  * If we don't have enough space to put in another
1780                  * match result, save our position and tell the
1781                  * user there are more devices to check.
1782                  */
1783                 if (spaceleft < sizeof(struct dev_match_result)) {
1784                         bzero(&cdm->pos, sizeof(cdm->pos));
1785                         cdm->pos.position_type =
1786                                 CAM_DEV_POS_EDT | CAM_DEV_POS_BUS |
1787                                 CAM_DEV_POS_TARGET | CAM_DEV_POS_DEVICE |
1788                                 CAM_DEV_POS_PERIPH;
1789
1790                         cdm->pos.cookie.bus = periph->path->bus;
1791                         cdm->pos.generations[CAM_BUS_GENERATION]=
1792                                 xsoftc.bus_generation;
1793                         cdm->pos.cookie.target = periph->path->target;
1794                         cdm->pos.generations[CAM_TARGET_GENERATION] =
1795                                 periph->path->bus->generation;
1796                         cdm->pos.cookie.device = periph->path->device;
1797                         cdm->pos.generations[CAM_DEV_GENERATION] =
1798                                 periph->path->target->generation;
1799                         cdm->pos.cookie.periph = periph;
1800                         cdm->pos.generations[CAM_PERIPH_GENERATION] =
1801                                 periph->path->device->generation;
1802                         cdm->status = CAM_DEV_MATCH_MORE;
1803                         return(0);
1804                 }
1805
1806                 j = cdm->num_matches;
1807                 cdm->num_matches++;
1808                 cdm->matches[j].type = DEV_MATCH_PERIPH;
1809                 cdm->matches[j].result.periph_result.path_id =
1810                         periph->path->bus->path_id;
1811                 cdm->matches[j].result.periph_result.target_id =
1812                         periph->path->target->target_id;
1813                 cdm->matches[j].result.periph_result.target_lun =
1814                         periph->path->device->lun_id;
1815                 cdm->matches[j].result.periph_result.unit_number =
1816                         periph->unit_number;
1817                 strncpy(cdm->matches[j].result.periph_result.periph_name,
1818                         periph->periph_name, DEV_IDLEN);
1819         }
1820
1821         return(1);
1822 }
1823
1824 static int
1825 xptedtmatch(struct ccb_dev_match *cdm)
1826 {
1827         int ret;
1828
1829         cdm->num_matches = 0;
1830
1831         /*
1832          * Check the bus list generation.  If it has changed, the user
1833          * needs to reset everything and start over.
1834          */
1835         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
1836          && (cdm->pos.generations[CAM_BUS_GENERATION] != 0)
1837          && (cdm->pos.generations[CAM_BUS_GENERATION] != xsoftc.bus_generation)) {
1838                 cdm->status = CAM_DEV_MATCH_LIST_CHANGED;
1839                 return(0);
1840         }
1841
1842         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
1843          && (cdm->pos.cookie.bus != NULL))
1844                 ret = xptbustraverse((struct cam_eb *)cdm->pos.cookie.bus,
1845                                      xptedtbusfunc, cdm);
1846         else
1847                 ret = xptbustraverse(NULL, xptedtbusfunc, cdm);
1848
1849         /*
1850          * If we get back 0, that means that we had to stop before fully
1851          * traversing the EDT.  It also means that one of the subroutines
1852          * has set the status field to the proper value.  If we get back 1,
1853          * we've fully traversed the EDT and copied out any matching entries.
1854          */
1855         if (ret == 1)
1856                 cdm->status = CAM_DEV_MATCH_LAST;
1857
1858         return(ret);
1859 }
1860
1861 static int
1862 xptplistpdrvfunc(struct periph_driver **pdrv, void *arg)
1863 {
1864         struct ccb_dev_match *cdm;
1865
1866         cdm = (struct ccb_dev_match *)arg;
1867
1868         if ((cdm->pos.position_type & CAM_DEV_POS_PDPTR)
1869          && (cdm->pos.cookie.pdrv == pdrv)
1870          && (cdm->pos.position_type & CAM_DEV_POS_PERIPH)
1871          && (cdm->pos.generations[CAM_PERIPH_GENERATION] != 0)
1872          && (cdm->pos.generations[CAM_PERIPH_GENERATION] !=
1873              (*pdrv)->generation)) {
1874                 cdm->status = CAM_DEV_MATCH_LIST_CHANGED;
1875                 return(0);
1876         }
1877
1878         if ((cdm->pos.position_type & CAM_DEV_POS_PDPTR)
1879          && (cdm->pos.cookie.pdrv == pdrv)
1880          && (cdm->pos.position_type & CAM_DEV_POS_PERIPH)
1881          && (cdm->pos.cookie.periph != NULL))
1882                 return(xptpdperiphtraverse(pdrv,
1883                                 (struct cam_periph *)cdm->pos.cookie.periph,
1884                                 xptplistperiphfunc, arg));
1885         else
1886                 return(xptpdperiphtraverse(pdrv, NULL,xptplistperiphfunc, arg));
1887 }
1888
1889 static int
1890 xptplistperiphfunc(struct cam_periph *periph, void *arg)
1891 {
1892         struct ccb_dev_match *cdm;
1893         dev_match_ret retval;
1894
1895         cdm = (struct ccb_dev_match *)arg;
1896
1897         retval = xptperiphmatch(cdm->patterns, cdm->num_patterns, periph);
1898
1899         if ((retval & DM_RET_ACTION_MASK) == DM_RET_ERROR) {
1900                 cdm->status = CAM_DEV_MATCH_ERROR;
1901                 return(0);
1902         }
1903
1904         /*
1905          * If the copy flag is set, copy this peripheral out.
1906          */
1907         if (retval & DM_RET_COPY) {
1908                 int spaceleft, j;
1909
1910                 spaceleft = cdm->match_buf_len - (cdm->num_matches *
1911                         sizeof(struct dev_match_result));
1912
1913                 /*
1914                  * If we don't have enough space to put in another
1915                  * match result, save our position and tell the
1916                  * user there are more devices to check.
1917                  */
1918                 if (spaceleft < sizeof(struct dev_match_result)) {
1919                         struct periph_driver **pdrv;
1920
1921                         pdrv = NULL;
1922                         bzero(&cdm->pos, sizeof(cdm->pos));
1923                         cdm->pos.position_type =
1924                                 CAM_DEV_POS_PDRV | CAM_DEV_POS_PDPTR |
1925                                 CAM_DEV_POS_PERIPH;
1926
1927                         /*
1928                          * This may look a bit non-sensical, but it is
1929                          * actually quite logical.  There are very few
1930                          * peripheral drivers, and bloating every peripheral
1931                          * structure with a pointer back to its parent
1932                          * peripheral driver linker set entry would cost
1933                          * more in the long run than doing this quick lookup.
1934                          */
1935                         for (pdrv = periph_drivers; *pdrv != NULL; pdrv++) {
1936                                 if (strcmp((*pdrv)->driver_name,
1937                                     periph->periph_name) == 0)
1938                                         break;
1939                         }
1940
1941                         if (*pdrv == NULL) {
1942                                 cdm->status = CAM_DEV_MATCH_ERROR;
1943                                 return(0);
1944                         }
1945
1946                         cdm->pos.cookie.pdrv = pdrv;
1947                         /*
1948                          * The periph generation slot does double duty, as
1949                          * does the periph pointer slot.  They are used for
1950                          * both edt and pdrv lookups and positioning.
1951                          */
1952                         cdm->pos.cookie.periph = periph;
1953                         cdm->pos.generations[CAM_PERIPH_GENERATION] =
1954                                 (*pdrv)->generation;
1955                         cdm->status = CAM_DEV_MATCH_MORE;
1956                         return(0);
1957                 }
1958
1959                 j = cdm->num_matches;
1960                 cdm->num_matches++;
1961                 cdm->matches[j].type = DEV_MATCH_PERIPH;
1962                 cdm->matches[j].result.periph_result.path_id =
1963                         periph->path->bus->path_id;
1964
1965                 /*
1966                  * The transport layer peripheral doesn't have a target or
1967                  * lun.
1968                  */
1969                 if (periph->path->target)
1970                         cdm->matches[j].result.periph_result.target_id =
1971                                 periph->path->target->target_id;
1972                 else
1973                         cdm->matches[j].result.periph_result.target_id = -1;
1974
1975                 if (periph->path->device)
1976                         cdm->matches[j].result.periph_result.target_lun =
1977                                 periph->path->device->lun_id;
1978                 else
1979                         cdm->matches[j].result.periph_result.target_lun = -1;
1980
1981                 cdm->matches[j].result.periph_result.unit_number =
1982                         periph->unit_number;
1983                 strncpy(cdm->matches[j].result.periph_result.periph_name,
1984                         periph->periph_name, DEV_IDLEN);
1985         }
1986
1987         return(1);
1988 }
1989
1990 static int
1991 xptperiphlistmatch(struct ccb_dev_match *cdm)
1992 {
1993         int ret;
1994
1995         cdm->num_matches = 0;
1996
1997         /*
1998          * At this point in the edt traversal function, we check the bus
1999          * list generation to make sure that no busses have been added or
2000          * removed since the user last sent a XPT_DEV_MATCH ccb through.
2001          * For the peripheral driver list traversal function, however, we
2002          * don't have to worry about new peripheral driver types coming or
2003          * going; they're in a linker set, and therefore can't change
2004          * without a recompile.
2005          */
2006
2007         if ((cdm->pos.position_type & CAM_DEV_POS_PDPTR)
2008          && (cdm->pos.cookie.pdrv != NULL))
2009                 ret = xptpdrvtraverse(
2010                                 (struct periph_driver **)cdm->pos.cookie.pdrv,
2011                                 xptplistpdrvfunc, cdm);
2012         else
2013                 ret = xptpdrvtraverse(NULL, xptplistpdrvfunc, cdm);
2014
2015         /*
2016          * If we get back 0, that means that we had to stop before fully
2017          * traversing the peripheral driver tree.  It also means that one of
2018          * the subroutines has set the status field to the proper value.  If
2019          * we get back 1, we've fully traversed the EDT and copied out any
2020          * matching entries.
2021          */
2022         if (ret == 1)
2023                 cdm->status = CAM_DEV_MATCH_LAST;
2024
2025         return(ret);
2026 }
2027
2028 static int
2029 xptbustraverse(struct cam_eb *start_bus, xpt_busfunc_t *tr_func, void *arg)
2030 {
2031         struct cam_eb *bus, *next_bus;
2032         int retval;
2033
2034         retval = 1;
2035
2036         mtx_lock(&xsoftc.xpt_topo_lock);
2037         for (bus = (start_bus ? start_bus : TAILQ_FIRST(&xsoftc.xpt_busses));
2038              bus != NULL;
2039              bus = next_bus) {
2040                 next_bus = TAILQ_NEXT(bus, links);
2041
2042                 mtx_unlock(&xsoftc.xpt_topo_lock);
2043                 CAM_SIM_LOCK(bus->sim);
2044                 retval = tr_func(bus, arg);
2045                 CAM_SIM_UNLOCK(bus->sim);
2046                 if (retval == 0)
2047                         return(retval);
2048                 mtx_lock(&xsoftc.xpt_topo_lock);
2049         }
2050         mtx_unlock(&xsoftc.xpt_topo_lock);
2051
2052         return(retval);
2053 }
2054
2055 int
2056 xpt_sim_opened(struct cam_sim *sim)
2057 {
2058         struct cam_eb *bus;
2059         struct cam_et *target;
2060         struct cam_ed *device;
2061         struct cam_periph *periph;
2062
2063         KASSERT(sim->refcount >= 1, ("sim->refcount >= 1"));
2064         mtx_assert(sim->mtx, MA_OWNED);
2065
2066         mtx_lock(&xsoftc.xpt_topo_lock);
2067         TAILQ_FOREACH(bus, &xsoftc.xpt_busses, links) {
2068                 if (bus->sim != sim)
2069                         continue;
2070
2071                 TAILQ_FOREACH(target, &bus->et_entries, links) {
2072                         TAILQ_FOREACH(device, &target->ed_entries, links) {
2073                                 SLIST_FOREACH(periph, &device->periphs,
2074                                     periph_links) {
2075                                         if (periph->refcount > 0) {
2076                                                 mtx_unlock(&xsoftc.xpt_topo_lock);
2077                                                 return (1);
2078                                         }
2079                                 }
2080                         }
2081                 }
2082         }
2083
2084         mtx_unlock(&xsoftc.xpt_topo_lock);
2085         return (0);
2086 }
2087
2088 static int
2089 xpttargettraverse(struct cam_eb *bus, struct cam_et *start_target,
2090                   xpt_targetfunc_t *tr_func, void *arg)
2091 {
2092         struct cam_et *target, *next_target;
2093         int retval;
2094
2095         retval = 1;
2096         for (target = (start_target ? start_target :
2097                        TAILQ_FIRST(&bus->et_entries));
2098              target != NULL; target = next_target) {
2099
2100                 next_target = TAILQ_NEXT(target, links);
2101
2102                 retval = tr_func(target, arg);
2103
2104                 if (retval == 0)
2105                         return(retval);
2106         }
2107
2108         return(retval);
2109 }
2110
2111 static int
2112 xptdevicetraverse(struct cam_et *target, struct cam_ed *start_device,
2113                   xpt_devicefunc_t *tr_func, void *arg)
2114 {
2115         struct cam_ed *device, *next_device;
2116         int retval;
2117
2118         retval = 1;
2119         for (device = (start_device ? start_device :
2120                        TAILQ_FIRST(&target->ed_entries));
2121              device != NULL;
2122              device = next_device) {
2123
2124                 next_device = TAILQ_NEXT(device, links);
2125
2126                 retval = tr_func(device, arg);
2127
2128                 if (retval == 0)
2129                         return(retval);
2130         }
2131
2132         return(retval);
2133 }
2134
2135 static int
2136 xptperiphtraverse(struct cam_ed *device, struct cam_periph *start_periph,
2137                   xpt_periphfunc_t *tr_func, void *arg)
2138 {
2139         struct cam_periph *periph, *next_periph;
2140         int retval;
2141
2142         retval = 1;
2143
2144         for (periph = (start_periph ? start_periph :
2145                        SLIST_FIRST(&device->periphs));
2146              periph != NULL;
2147              periph = next_periph) {
2148
2149                 next_periph = SLIST_NEXT(periph, periph_links);
2150
2151                 retval = tr_func(periph, arg);
2152                 if (retval == 0)
2153                         return(retval);
2154         }
2155
2156         return(retval);
2157 }
2158
2159 static int
2160 xptpdrvtraverse(struct periph_driver **start_pdrv,
2161                 xpt_pdrvfunc_t *tr_func, void *arg)
2162 {
2163         struct periph_driver **pdrv;
2164         int retval;
2165
2166         retval = 1;
2167
2168         /*
2169          * We don't traverse the peripheral driver list like we do the
2170          * other lists, because it is a linker set, and therefore cannot be
2171          * changed during runtime.  If the peripheral driver list is ever
2172          * re-done to be something other than a linker set (i.e. it can
2173          * change while the system is running), the list traversal should
2174          * be modified to work like the other traversal functions.
2175          */
2176         for (pdrv = (start_pdrv ? start_pdrv : periph_drivers);
2177              *pdrv != NULL; pdrv++) {
2178                 retval = tr_func(pdrv, arg);
2179
2180                 if (retval == 0)
2181                         return(retval);
2182         }
2183
2184         return(retval);
2185 }
2186
2187 static int
2188 xptpdperiphtraverse(struct periph_driver **pdrv,
2189                     struct cam_periph *start_periph,
2190                     xpt_periphfunc_t *tr_func, void *arg)
2191 {
2192         struct cam_periph *periph, *next_periph;
2193         int retval;
2194
2195         retval = 1;
2196
2197         for (periph = (start_periph ? start_periph :
2198              TAILQ_FIRST(&(*pdrv)->units)); periph != NULL;
2199              periph = next_periph) {
2200
2201                 next_periph = TAILQ_NEXT(periph, unit_links);
2202
2203                 retval = tr_func(periph, arg);
2204                 if (retval == 0)
2205                         return(retval);
2206         }
2207         return(retval);
2208 }
2209
2210 static int
2211 xptdefbusfunc(struct cam_eb *bus, void *arg)
2212 {
2213         struct xpt_traverse_config *tr_config;
2214
2215         tr_config = (struct xpt_traverse_config *)arg;
2216
2217         if (tr_config->depth == XPT_DEPTH_BUS) {
2218                 xpt_busfunc_t *tr_func;
2219
2220                 tr_func = (xpt_busfunc_t *)tr_config->tr_func;
2221
2222                 return(tr_func(bus, tr_config->tr_arg));
2223         } else
2224                 return(xpttargettraverse(bus, NULL, xptdeftargetfunc, arg));
2225 }
2226
2227 static int
2228 xptdeftargetfunc(struct cam_et *target, void *arg)
2229 {
2230         struct xpt_traverse_config *tr_config;
2231
2232         tr_config = (struct xpt_traverse_config *)arg;
2233
2234         if (tr_config->depth == XPT_DEPTH_TARGET) {
2235                 xpt_targetfunc_t *tr_func;
2236
2237                 tr_func = (xpt_targetfunc_t *)tr_config->tr_func;
2238
2239                 return(tr_func(target, tr_config->tr_arg));
2240         } else
2241                 return(xptdevicetraverse(target, NULL, xptdefdevicefunc, arg));
2242 }
2243
2244 static int
2245 xptdefdevicefunc(struct cam_ed *device, void *arg)
2246 {
2247         struct xpt_traverse_config *tr_config;
2248
2249         tr_config = (struct xpt_traverse_config *)arg;
2250
2251         if (tr_config->depth == XPT_DEPTH_DEVICE) {
2252                 xpt_devicefunc_t *tr_func;
2253
2254                 tr_func = (xpt_devicefunc_t *)tr_config->tr_func;
2255
2256                 return(tr_func(device, tr_config->tr_arg));
2257         } else
2258                 return(xptperiphtraverse(device, NULL, xptdefperiphfunc, arg));
2259 }
2260
2261 static int
2262 xptdefperiphfunc(struct cam_periph *periph, void *arg)
2263 {
2264         struct xpt_traverse_config *tr_config;
2265         xpt_periphfunc_t *tr_func;
2266
2267         tr_config = (struct xpt_traverse_config *)arg;
2268
2269         tr_func = (xpt_periphfunc_t *)tr_config->tr_func;
2270
2271         /*
2272          * Unlike the other default functions, we don't check for depth
2273          * here.  The peripheral driver level is the last level in the EDT,
2274          * so if we're here, we should execute the function in question.
2275          */
2276         return(tr_func(periph, tr_config->tr_arg));
2277 }
2278
2279 /*
2280  * Execute the given function for every bus in the EDT.
2281  */
2282 static int
2283 xpt_for_all_busses(xpt_busfunc_t *tr_func, void *arg)
2284 {
2285         struct xpt_traverse_config tr_config;
2286
2287         tr_config.depth = XPT_DEPTH_BUS;
2288         tr_config.tr_func = tr_func;
2289         tr_config.tr_arg = arg;
2290
2291         return(xptbustraverse(NULL, xptdefbusfunc, &tr_config));
2292 }
2293
2294 /*
2295  * Execute the given function for every device in the EDT.
2296  */
2297 static int
2298 xpt_for_all_devices(xpt_devicefunc_t *tr_func, void *arg)
2299 {
2300         struct xpt_traverse_config tr_config;
2301
2302         tr_config.depth = XPT_DEPTH_DEVICE;
2303         tr_config.tr_func = tr_func;
2304         tr_config.tr_arg = arg;
2305
2306         return(xptbustraverse(NULL, xptdefbusfunc, &tr_config));
2307 }
2308
2309 static int
2310 xptsetasyncfunc(struct cam_ed *device, void *arg)
2311 {
2312         struct cam_path path;
2313         struct ccb_getdev cgd;
2314         struct async_node *cur_entry;
2315
2316         cur_entry = (struct async_node *)arg;
2317
2318         /*
2319          * Don't report unconfigured devices (Wildcard devs,
2320          * devices only for target mode, device instances
2321          * that have been invalidated but are waiting for
2322          * their last reference count to be released).
2323          */
2324         if ((device->flags & CAM_DEV_UNCONFIGURED) != 0)
2325                 return (1);
2326
2327         xpt_compile_path(&path,
2328                          NULL,
2329                          device->target->bus->path_id,
2330                          device->target->target_id,
2331                          device->lun_id);
2332         xpt_setup_ccb(&cgd.ccb_h, &path, /*priority*/1);
2333         cgd.ccb_h.func_code = XPT_GDEV_TYPE;
2334         xpt_action((union ccb *)&cgd);
2335         cur_entry->callback(cur_entry->callback_arg,
2336                             AC_FOUND_DEVICE,
2337                             &path, &cgd);
2338         xpt_release_path(&path);
2339
2340         return(1);
2341 }
2342
2343 static int
2344 xptsetasyncbusfunc(struct cam_eb *bus, void *arg)
2345 {
2346         struct cam_path path;
2347         struct ccb_pathinq cpi;
2348         struct async_node *cur_entry;
2349
2350         cur_entry = (struct async_node *)arg;
2351
2352         xpt_compile_path(&path, /*periph*/NULL,
2353                          bus->sim->path_id,
2354                          CAM_TARGET_WILDCARD,
2355                          CAM_LUN_WILDCARD);
2356         xpt_setup_ccb(&cpi.ccb_h, &path, /*priority*/1);
2357         cpi.ccb_h.func_code = XPT_PATH_INQ;
2358         xpt_action((union ccb *)&cpi);
2359         cur_entry->callback(cur_entry->callback_arg,
2360                             AC_PATH_REGISTERED,
2361                             &path, &cpi);
2362         xpt_release_path(&path);
2363
2364         return(1);
2365 }
2366
2367 static void
2368 xpt_action_sasync_cb(void *context, int pending)
2369 {
2370         struct async_node *cur_entry;
2371         struct xpt_task *task;
2372         uint32_t added;
2373
2374         task = (struct xpt_task *)context;
2375         cur_entry = (struct async_node *)task->data1;
2376         added = task->data2;
2377
2378         if ((added & AC_FOUND_DEVICE) != 0) {
2379                 /*
2380                  * Get this peripheral up to date with all
2381                  * the currently existing devices.
2382                  */
2383                 xpt_for_all_devices(xptsetasyncfunc, cur_entry);
2384         }
2385         if ((added & AC_PATH_REGISTERED) != 0) {
2386                 /*
2387                  * Get this peripheral up to date with all
2388                  * the currently existing busses.
2389                  */
2390                 xpt_for_all_busses(xptsetasyncbusfunc, cur_entry);
2391         }
2392
2393         free(task, M_CAMXPT);
2394 }
2395
2396 void
2397 xpt_action(union ccb *start_ccb)
2398 {
2399
2400         CAM_DEBUG(start_ccb->ccb_h.path, CAM_DEBUG_TRACE, ("xpt_action\n"));
2401
2402         start_ccb->ccb_h.status = CAM_REQ_INPROG;
2403         (*(start_ccb->ccb_h.path->bus->xport->action))(start_ccb);
2404 }
2405
2406 void
2407 xpt_action_default(union ccb *start_ccb)
2408 {
2409
2410         CAM_DEBUG(start_ccb->ccb_h.path, CAM_DEBUG_TRACE, ("xpt_action_default\n"));
2411
2412
2413         switch (start_ccb->ccb_h.func_code) {
2414         case XPT_SCSI_IO:
2415         {
2416                 struct cam_ed *device;
2417 #ifdef CAMDEBUG
2418                 char cdb_str[(SCSI_MAX_CDBLEN * 3) + 1];
2419                 struct cam_path *path;
2420
2421                 path = start_ccb->ccb_h.path;
2422 #endif
2423
2424                 /*
2425                  * For the sake of compatibility with SCSI-1
2426                  * devices that may not understand the identify
2427                  * message, we include lun information in the
2428                  * second byte of all commands.  SCSI-1 specifies
2429                  * that luns are a 3 bit value and reserves only 3
2430                  * bits for lun information in the CDB.  Later
2431                  * revisions of the SCSI spec allow for more than 8
2432                  * luns, but have deprecated lun information in the
2433                  * CDB.  So, if the lun won't fit, we must omit.
2434                  *
2435                  * Also be aware that during initial probing for devices,
2436                  * the inquiry information is unknown but initialized to 0.
2437                  * This means that this code will be exercised while probing
2438                  * devices with an ANSI revision greater than 2.
2439                  */
2440                 device = start_ccb->ccb_h.path->device;
2441                 if (device->protocol_version <= SCSI_REV_2
2442                  && start_ccb->ccb_h.target_lun < 8
2443                  && (start_ccb->ccb_h.flags & CAM_CDB_POINTER) == 0) {
2444
2445                         start_ccb->csio.cdb_io.cdb_bytes[1] |=
2446                             start_ccb->ccb_h.target_lun << 5;
2447                 }
2448                 start_ccb->csio.scsi_status = SCSI_STATUS_OK;
2449                 CAM_DEBUG(path, CAM_DEBUG_CDB,("%s. CDB: %s\n",
2450                           scsi_op_desc(start_ccb->csio.cdb_io.cdb_bytes[0],
2451                                        &path->device->inq_data),
2452                           scsi_cdb_string(start_ccb->csio.cdb_io.cdb_bytes,
2453                                           cdb_str, sizeof(cdb_str))));
2454         }
2455         /* FALLTHROUGH */
2456         case XPT_TARGET_IO:
2457         case XPT_CONT_TARGET_IO:
2458                 start_ccb->csio.sense_resid = 0;
2459                 start_ccb->csio.resid = 0;
2460                 /* FALLTHROUGH */
2461         case XPT_ATA_IO:
2462                 if (start_ccb->ccb_h.func_code == XPT_ATA_IO) {
2463                         start_ccb->ataio.resid = 0;
2464                 }
2465         case XPT_RESET_DEV:
2466         case XPT_ENG_EXEC:
2467         {
2468                 struct cam_path *path;
2469                 int runq;
2470
2471                 path = start_ccb->ccb_h.path;
2472
2473                 cam_ccbq_insert_ccb(&path->device->ccbq, start_ccb);
2474                 if (path->device->qfrozen_cnt == 0)
2475                         runq = xpt_schedule_dev_sendq(path->bus, path->device);
2476                 else
2477                         runq = 0;
2478                 if (runq != 0)
2479                         xpt_run_dev_sendq(path->bus);
2480                 break;
2481         }
2482         case XPT_CALC_GEOMETRY:
2483         {
2484                 struct cam_sim *sim;
2485
2486                 /* Filter out garbage */
2487                 if (start_ccb->ccg.block_size == 0
2488                  || start_ccb->ccg.volume_size == 0) {
2489                         start_ccb->ccg.cylinders = 0;
2490                         start_ccb->ccg.heads = 0;
2491                         start_ccb->ccg.secs_per_track = 0;
2492                         start_ccb->ccb_h.status = CAM_REQ_CMP;
2493                         break;
2494                 }
2495 #ifdef PC98
2496                 /*
2497                  * In a PC-98 system, geometry translation depens on
2498                  * the "real" device geometry obtained from mode page 4.
2499                  * SCSI geometry translation is performed in the
2500                  * initialization routine of the SCSI BIOS and the result
2501                  * stored in host memory.  If the translation is available
2502                  * in host memory, use it.  If not, rely on the default
2503                  * translation the device driver performs.
2504                  */
2505                 if (scsi_da_bios_params(&start_ccb->ccg) != 0) {
2506                         start_ccb->ccb_h.status = CAM_REQ_CMP;
2507                         break;
2508                 }
2509 #endif
2510                 sim = start_ccb->ccb_h.path->bus->sim;
2511                 (*(sim->sim_action))(sim, start_ccb);
2512                 break;
2513         }
2514         case XPT_ABORT:
2515         {
2516                 union ccb* abort_ccb;
2517
2518                 abort_ccb = start_ccb->cab.abort_ccb;
2519                 if (XPT_FC_IS_DEV_QUEUED(abort_ccb)) {
2520
2521                         if (abort_ccb->ccb_h.pinfo.index >= 0) {
2522                                 struct cam_ccbq *ccbq;
2523
2524                                 ccbq = &abort_ccb->ccb_h.path->device->ccbq;
2525                                 cam_ccbq_remove_ccb(ccbq, abort_ccb);
2526                                 abort_ccb->ccb_h.status =
2527                                     CAM_REQ_ABORTED|CAM_DEV_QFRZN;
2528                                 xpt_freeze_devq(abort_ccb->ccb_h.path, 1);
2529                                 xpt_done(abort_ccb);
2530                                 start_ccb->ccb_h.status = CAM_REQ_CMP;
2531                                 break;
2532                         }
2533                         if (abort_ccb->ccb_h.pinfo.index == CAM_UNQUEUED_INDEX
2534                          && (abort_ccb->ccb_h.status & CAM_SIM_QUEUED) == 0) {
2535                                 /*
2536                                  * We've caught this ccb en route to
2537                                  * the SIM.  Flag it for abort and the
2538                                  * SIM will do so just before starting
2539                                  * real work on the CCB.
2540                                  */
2541                                 abort_ccb->ccb_h.status =
2542                                     CAM_REQ_ABORTED|CAM_DEV_QFRZN;
2543                                 xpt_freeze_devq(abort_ccb->ccb_h.path, 1);
2544                                 start_ccb->ccb_h.status = CAM_REQ_CMP;
2545                                 break;
2546                         }
2547                 }
2548                 if (XPT_FC_IS_QUEUED(abort_ccb)
2549                  && (abort_ccb->ccb_h.pinfo.index == CAM_DONEQ_INDEX)) {
2550                         /*
2551                          * It's already completed but waiting
2552                          * for our SWI to get to it.
2553                          */
2554                         start_ccb->ccb_h.status = CAM_UA_ABORT;
2555                         break;
2556                 }
2557                 /*
2558                  * If we weren't able to take care of the abort request
2559                  * in the XPT, pass the request down to the SIM for processing.
2560                  */
2561         }
2562         /* FALLTHROUGH */
2563         case XPT_ACCEPT_TARGET_IO:
2564         case XPT_EN_LUN:
2565         case XPT_IMMED_NOTIFY:
2566         case XPT_NOTIFY_ACK:
2567         case XPT_RESET_BUS:
2568         case XPT_IMMEDIATE_NOTIFY:
2569         case XPT_NOTIFY_ACKNOWLEDGE:
2570         case XPT_GET_SIM_KNOB:
2571         case XPT_SET_SIM_KNOB:
2572         {
2573                 struct cam_sim *sim;
2574
2575                 sim = start_ccb->ccb_h.path->bus->sim;
2576                 (*(sim->sim_action))(sim, start_ccb);
2577                 break;
2578         }
2579         case XPT_PATH_INQ:
2580         {
2581                 struct cam_sim *sim;
2582
2583                 sim = start_ccb->ccb_h.path->bus->sim;
2584                 (*(sim->sim_action))(sim, start_ccb);
2585                 break;
2586         }
2587         case XPT_PATH_STATS:
2588                 start_ccb->cpis.last_reset =
2589                         start_ccb->ccb_h.path->bus->last_reset;
2590                 start_ccb->ccb_h.status = CAM_REQ_CMP;
2591                 break;
2592         case XPT_GDEV_TYPE:
2593         {
2594                 struct cam_ed *dev;
2595
2596                 dev = start_ccb->ccb_h.path->device;
2597                 if ((dev->flags & CAM_DEV_UNCONFIGURED) != 0) {
2598                         start_ccb->ccb_h.status = CAM_DEV_NOT_THERE;
2599                 } else {
2600                         struct ccb_getdev *cgd;
2601                         struct cam_eb *bus;
2602                         struct cam_et *tar;
2603
2604                         cgd = &start_ccb->cgd;
2605                         bus = cgd->ccb_h.path->bus;
2606                         tar = cgd->ccb_h.path->target;
2607                         cgd->protocol = dev->protocol;
2608                         cgd->inq_data = dev->inq_data;
2609                         cgd->ident_data = dev->ident_data;
2610                         cgd->ccb_h.status = CAM_REQ_CMP;
2611                         cgd->serial_num_len = dev->serial_num_len;
2612                         if ((dev->serial_num_len > 0)
2613                          && (dev->serial_num != NULL))
2614                                 bcopy(dev->serial_num, cgd->serial_num,
2615                                       dev->serial_num_len);
2616                 }
2617                 break;
2618         }
2619         case XPT_GDEV_STATS:
2620         {
2621                 struct cam_ed *dev;
2622
2623                 dev = start_ccb->ccb_h.path->device;
2624                 if ((dev->flags & CAM_DEV_UNCONFIGURED) != 0) {
2625                         start_ccb->ccb_h.status = CAM_DEV_NOT_THERE;
2626                 } else {
2627                         struct ccb_getdevstats *cgds;
2628                         struct cam_eb *bus;
2629                         struct cam_et *tar;
2630
2631                         cgds = &start_ccb->cgds;
2632                         bus = cgds->ccb_h.path->bus;
2633                         tar = cgds->ccb_h.path->target;
2634                         cgds->dev_openings = dev->ccbq.dev_openings;
2635                         cgds->dev_active = dev->ccbq.dev_active;
2636                         cgds->devq_openings = dev->ccbq.devq_openings;
2637                         cgds->devq_queued = dev->ccbq.queue.entries;
2638                         cgds->held = dev->ccbq.held;
2639                         cgds->last_reset = tar->last_reset;
2640                         cgds->maxtags = dev->maxtags;
2641                         cgds->mintags = dev->mintags;
2642                         if (timevalcmp(&tar->last_reset, &bus->last_reset, <))
2643                                 cgds->last_reset = bus->last_reset;
2644                         cgds->ccb_h.status = CAM_REQ_CMP;
2645                 }
2646                 break;
2647         }
2648         case XPT_GDEVLIST:
2649         {
2650                 struct cam_periph       *nperiph;
2651                 struct periph_list      *periph_head;
2652                 struct ccb_getdevlist   *cgdl;
2653                 u_int                   i;
2654                 struct cam_ed           *device;
2655                 int                     found;
2656
2657
2658                 found = 0;
2659
2660                 /*
2661                  * Don't want anyone mucking with our data.
2662                  */
2663                 device = start_ccb->ccb_h.path->device;
2664                 periph_head = &device->periphs;
2665                 cgdl = &start_ccb->cgdl;
2666
2667                 /*
2668                  * Check and see if the list has changed since the user
2669                  * last requested a list member.  If so, tell them that the
2670                  * list has changed, and therefore they need to start over
2671                  * from the beginning.
2672                  */
2673                 if ((cgdl->index != 0) &&
2674                     (cgdl->generation != device->generation)) {
2675                         cgdl->status = CAM_GDEVLIST_LIST_CHANGED;
2676                         break;
2677                 }
2678
2679                 /*
2680                  * Traverse the list of peripherals and attempt to find
2681                  * the requested peripheral.
2682                  */
2683                 for (nperiph = SLIST_FIRST(periph_head), i = 0;
2684                      (nperiph != NULL) && (i <= cgdl->index);
2685                      nperiph = SLIST_NEXT(nperiph, periph_links), i++) {
2686                         if (i == cgdl->index) {
2687                                 strncpy(cgdl->periph_name,
2688                                         nperiph->periph_name,
2689                                         DEV_IDLEN);
2690                                 cgdl->unit_number = nperiph->unit_number;
2691                                 found = 1;
2692                         }
2693                 }
2694                 if (found == 0) {
2695                         cgdl->status = CAM_GDEVLIST_ERROR;
2696                         break;
2697                 }
2698
2699                 if (nperiph == NULL)
2700                         cgdl->status = CAM_GDEVLIST_LAST_DEVICE;
2701                 else
2702                         cgdl->status = CAM_GDEVLIST_MORE_DEVS;
2703
2704                 cgdl->index++;
2705                 cgdl->generation = device->generation;
2706
2707                 cgdl->ccb_h.status = CAM_REQ_CMP;
2708                 break;
2709         }
2710         case XPT_DEV_MATCH:
2711         {
2712                 dev_pos_type position_type;
2713                 struct ccb_dev_match *cdm;
2714
2715                 cdm = &start_ccb->cdm;
2716
2717                 /*
2718                  * There are two ways of getting at information in the EDT.
2719                  * The first way is via the primary EDT tree.  It starts
2720                  * with a list of busses, then a list of targets on a bus,
2721                  * then devices/luns on a target, and then peripherals on a
2722                  * device/lun.  The "other" way is by the peripheral driver
2723                  * lists.  The peripheral driver lists are organized by
2724                  * peripheral driver.  (obviously)  So it makes sense to
2725                  * use the peripheral driver list if the user is looking
2726                  * for something like "da1", or all "da" devices.  If the
2727                  * user is looking for something on a particular bus/target
2728                  * or lun, it's generally better to go through the EDT tree.
2729                  */
2730
2731                 if (cdm->pos.position_type != CAM_DEV_POS_NONE)
2732                         position_type = cdm->pos.position_type;
2733                 else {
2734                         u_int i;
2735
2736                         position_type = CAM_DEV_POS_NONE;
2737
2738                         for (i = 0; i < cdm->num_patterns; i++) {
2739                                 if ((cdm->patterns[i].type == DEV_MATCH_BUS)
2740                                  ||(cdm->patterns[i].type == DEV_MATCH_DEVICE)){
2741                                         position_type = CAM_DEV_POS_EDT;
2742                                         break;
2743                                 }
2744                         }
2745
2746                         if (cdm->num_patterns == 0)
2747                                 position_type = CAM_DEV_POS_EDT;
2748                         else if (position_type == CAM_DEV_POS_NONE)
2749                                 position_type = CAM_DEV_POS_PDRV;
2750                 }
2751
2752                 switch(position_type & CAM_DEV_POS_TYPEMASK) {
2753                 case CAM_DEV_POS_EDT:
2754                         xptedtmatch(cdm);
2755                         break;
2756                 case CAM_DEV_POS_PDRV:
2757                         xptperiphlistmatch(cdm);
2758                         break;
2759                 default:
2760                         cdm->status = CAM_DEV_MATCH_ERROR;
2761                         break;
2762                 }
2763
2764                 if (cdm->status == CAM_DEV_MATCH_ERROR)
2765                         start_ccb->ccb_h.status = CAM_REQ_CMP_ERR;
2766                 else
2767                         start_ccb->ccb_h.status = CAM_REQ_CMP;
2768
2769                 break;
2770         }
2771         case XPT_SASYNC_CB:
2772         {
2773                 struct ccb_setasync *csa;
2774                 struct async_node *cur_entry;
2775                 struct async_list *async_head;
2776                 u_int32_t added;
2777
2778                 csa = &start_ccb->csa;
2779                 added = csa->event_enable;
2780                 async_head = &csa->ccb_h.path->device->asyncs;
2781
2782                 /*
2783                  * If there is already an entry for us, simply
2784                  * update it.
2785                  */
2786                 cur_entry = SLIST_FIRST(async_head);
2787                 while (cur_entry != NULL) {
2788                         if ((cur_entry->callback_arg == csa->callback_arg)
2789                          && (cur_entry->callback == csa->callback))
2790                                 break;
2791                         cur_entry = SLIST_NEXT(cur_entry, links);
2792                 }
2793
2794                 if (cur_entry != NULL) {
2795                         /*
2796                          * If the request has no flags set,
2797                          * remove the entry.
2798                          */
2799                         added &= ~cur_entry->event_enable;
2800                         if (csa->event_enable == 0) {
2801                                 SLIST_REMOVE(async_head, cur_entry,
2802                                              async_node, links);
2803                                 csa->ccb_h.path->device->refcount--;
2804                                 free(cur_entry, M_CAMXPT);
2805                         } else {
2806                                 cur_entry->event_enable = csa->event_enable;
2807                         }
2808                 } else {
2809                         cur_entry = malloc(sizeof(*cur_entry), M_CAMXPT,
2810                                            M_NOWAIT);
2811                         if (cur_entry == NULL) {
2812                                 csa->ccb_h.status = CAM_RESRC_UNAVAIL;
2813                                 break;
2814                         }
2815                         cur_entry->event_enable = csa->event_enable;
2816                         cur_entry->callback_arg = csa->callback_arg;
2817                         cur_entry->callback = csa->callback;
2818                         SLIST_INSERT_HEAD(async_head, cur_entry, links);
2819                         csa->ccb_h.path->device->refcount++;
2820                 }
2821
2822                 /*
2823                  * Need to decouple this operation via a taqskqueue so that
2824                  * the locking doesn't become a mess.
2825                  */
2826                 if ((added & (AC_FOUND_DEVICE | AC_PATH_REGISTERED)) != 0) {
2827                         struct xpt_task *task;
2828
2829                         task = malloc(sizeof(struct xpt_task), M_CAMXPT,
2830                                       M_NOWAIT);
2831                         if (task == NULL) {
2832                                 csa->ccb_h.status = CAM_RESRC_UNAVAIL;
2833                                 break;
2834                         }
2835
2836                         TASK_INIT(&task->task, 0, xpt_action_sasync_cb, task);
2837                         task->data1 = cur_entry;
2838                         task->data2 = added;
2839                         taskqueue_enqueue(taskqueue_thread, &task->task);
2840                 }
2841
2842                 start_ccb->ccb_h.status = CAM_REQ_CMP;
2843                 break;
2844         }
2845         case XPT_REL_SIMQ:
2846         {
2847                 struct ccb_relsim *crs;
2848                 struct cam_ed *dev;
2849
2850                 crs = &start_ccb->crs;
2851                 dev = crs->ccb_h.path->device;
2852                 if (dev == NULL) {
2853
2854                         crs->ccb_h.status = CAM_DEV_NOT_THERE;
2855                         break;
2856                 }
2857
2858                 if ((crs->release_flags & RELSIM_ADJUST_OPENINGS) != 0) {
2859
2860                         if (INQ_DATA_TQ_ENABLED(&dev->inq_data)) {
2861                                 /* Don't ever go below one opening */
2862                                 if (crs->openings > 0) {
2863                                         xpt_dev_ccbq_resize(crs->ccb_h.path,
2864                                                             crs->openings);
2865
2866                                         if (bootverbose) {
2867                                                 xpt_print(crs->ccb_h.path,
2868                                                     "tagged openings now %d\n",
2869                                                     crs->openings);
2870                                         }
2871                                 }
2872                         }
2873                 }
2874
2875                 if ((crs->release_flags & RELSIM_RELEASE_AFTER_TIMEOUT) != 0) {
2876
2877                         if ((dev->flags & CAM_DEV_REL_TIMEOUT_PENDING) != 0) {
2878
2879                                 /*
2880                                  * Just extend the old timeout and decrement
2881                                  * the freeze count so that a single timeout
2882                                  * is sufficient for releasing the queue.
2883                                  */
2884                                 start_ccb->ccb_h.flags &= ~CAM_DEV_QFREEZE;
2885                                 callout_stop(&dev->callout);
2886                         } else {
2887
2888                                 start_ccb->ccb_h.flags |= CAM_DEV_QFREEZE;
2889                         }
2890
2891                         callout_reset(&dev->callout,
2892                             (crs->release_timeout * hz) / 1000,
2893                             xpt_release_devq_timeout, dev);
2894
2895                         dev->flags |= CAM_DEV_REL_TIMEOUT_PENDING;
2896
2897                 }
2898
2899                 if ((crs->release_flags & RELSIM_RELEASE_AFTER_CMDCMPLT) != 0) {
2900
2901                         if ((dev->flags & CAM_DEV_REL_ON_COMPLETE) != 0) {
2902                                 /*
2903                                  * Decrement the freeze count so that a single
2904                                  * completion is still sufficient to unfreeze
2905                                  * the queue.
2906                                  */
2907                                 start_ccb->ccb_h.flags &= ~CAM_DEV_QFREEZE;
2908                         } else {
2909
2910                                 dev->flags |= CAM_DEV_REL_ON_COMPLETE;
2911                                 start_ccb->ccb_h.flags |= CAM_DEV_QFREEZE;
2912                         }
2913                 }
2914
2915                 if ((crs->release_flags & RELSIM_RELEASE_AFTER_QEMPTY) != 0) {
2916
2917                         if ((dev->flags & CAM_DEV_REL_ON_QUEUE_EMPTY) != 0
2918                          || (dev->ccbq.dev_active == 0)) {
2919
2920                                 start_ccb->ccb_h.flags &= ~CAM_DEV_QFREEZE;
2921                         } else {
2922
2923                                 dev->flags |= CAM_DEV_REL_ON_QUEUE_EMPTY;
2924                                 start_ccb->ccb_h.flags |= CAM_DEV_QFREEZE;
2925                         }
2926                 }
2927
2928                 if ((start_ccb->ccb_h.flags & CAM_DEV_QFREEZE) == 0) {
2929
2930                         xpt_release_devq(crs->ccb_h.path, /*count*/1,
2931                                          /*run_queue*/TRUE);
2932                 }
2933                 start_ccb->crs.qfrozen_cnt = dev->qfrozen_cnt;
2934                 start_ccb->ccb_h.status = CAM_REQ_CMP;
2935                 break;
2936         }
2937         case XPT_DEBUG: {
2938 #ifdef CAMDEBUG
2939 #ifdef CAM_DEBUG_DELAY
2940                 cam_debug_delay = CAM_DEBUG_DELAY;
2941 #endif
2942                 cam_dflags = start_ccb->cdbg.flags;
2943                 if (cam_dpath != NULL) {
2944                         xpt_free_path(cam_dpath);
2945                         cam_dpath = NULL;
2946                 }
2947
2948                 if (cam_dflags != CAM_DEBUG_NONE) {
2949                         if (xpt_create_path(&cam_dpath, xpt_periph,
2950                                             start_ccb->ccb_h.path_id,
2951                                             start_ccb->ccb_h.target_id,
2952                                             start_ccb->ccb_h.target_lun) !=
2953                                             CAM_REQ_CMP) {
2954                                 start_ccb->ccb_h.status = CAM_RESRC_UNAVAIL;
2955                                 cam_dflags = CAM_DEBUG_NONE;
2956                         } else {
2957                                 start_ccb->ccb_h.status = CAM_REQ_CMP;
2958                                 xpt_print(cam_dpath, "debugging flags now %x\n",
2959                                     cam_dflags);
2960                         }
2961                 } else {
2962                         cam_dpath = NULL;
2963                         start_ccb->ccb_h.status = CAM_REQ_CMP;
2964                 }
2965 #else /* !CAMDEBUG */
2966                 start_ccb->ccb_h.status = CAM_FUNC_NOTAVAIL;
2967 #endif /* CAMDEBUG */
2968                 break;
2969         }
2970         case XPT_NOOP:
2971                 if ((start_ccb->ccb_h.flags & CAM_DEV_QFREEZE) != 0)
2972                         xpt_freeze_devq(start_ccb->ccb_h.path, 1);
2973                 start_ccb->ccb_h.status = CAM_REQ_CMP;
2974                 break;
2975         default:
2976         case XPT_SDEV_TYPE:
2977         case XPT_TERM_IO:
2978         case XPT_ENG_INQ:
2979                 /* XXX Implement */
2980                 start_ccb->ccb_h.status = CAM_PROVIDE_FAIL;
2981                 break;
2982         }
2983 }
2984
2985 void
2986 xpt_polled_action(union ccb *start_ccb)
2987 {
2988         u_int32_t timeout;
2989         struct    cam_sim *sim;
2990         struct    cam_devq *devq;
2991         struct    cam_ed *dev;
2992
2993
2994         timeout = start_ccb->ccb_h.timeout;
2995         sim = start_ccb->ccb_h.path->bus->sim;
2996         devq = sim->devq;
2997         dev = start_ccb->ccb_h.path->device;
2998
2999         mtx_assert(sim->mtx, MA_OWNED);
3000
3001         /*
3002          * Steal an opening so that no other queued requests
3003          * can get it before us while we simulate interrupts.
3004          */
3005         dev->ccbq.devq_openings--;
3006         dev->ccbq.dev_openings--;
3007
3008         while(((devq != NULL && devq->send_openings <= 0) ||
3009            dev->ccbq.dev_openings < 0) && (--timeout > 0)) {
3010                 DELAY(1000);
3011                 (*(sim->sim_poll))(sim);
3012                 camisr_runqueue(&sim->sim_doneq);
3013         }
3014
3015         dev->ccbq.devq_openings++;
3016         dev->ccbq.dev_openings++;
3017
3018         if (timeout != 0) {
3019                 xpt_action(start_ccb);
3020                 while(--timeout > 0) {
3021                         (*(sim->sim_poll))(sim);
3022                         camisr_runqueue(&sim->sim_doneq);
3023                         if ((start_ccb->ccb_h.status  & CAM_STATUS_MASK)
3024                             != CAM_REQ_INPROG)
3025                                 break;
3026                         DELAY(1000);
3027                 }
3028                 if (timeout == 0) {
3029                         /*
3030                          * XXX Is it worth adding a sim_timeout entry
3031                          * point so we can attempt recovery?  If
3032                          * this is only used for dumps, I don't think
3033                          * it is.
3034                          */
3035                         start_ccb->ccb_h.status = CAM_CMD_TIMEOUT;
3036                 }
3037         } else {
3038                 start_ccb->ccb_h.status = CAM_RESRC_UNAVAIL;
3039         }
3040 }
3041
3042 /*
3043  * Schedule a peripheral driver to receive a ccb when it's
3044  * target device has space for more transactions.
3045  */
3046 void
3047 xpt_schedule(struct cam_periph *perph, u_int32_t new_priority)
3048 {
3049         struct cam_ed *device;
3050         int runq;
3051
3052         mtx_assert(perph->sim->mtx, MA_OWNED);
3053
3054         CAM_DEBUG(perph->path, CAM_DEBUG_TRACE, ("xpt_schedule\n"));
3055         device = perph->path->device;
3056         if (periph_is_queued(perph)) {
3057                 /* Simply reorder based on new priority */
3058                 CAM_DEBUG(perph->path, CAM_DEBUG_SUBTRACE,
3059                           ("   change priority to %d\n", new_priority));
3060                 if (new_priority < perph->pinfo.priority) {
3061                         camq_change_priority(&device->drvq,
3062                                              perph->pinfo.index,
3063                                              new_priority);
3064                 }
3065                 runq = 0;
3066         } else {
3067                 /* New entry on the queue */
3068                 CAM_DEBUG(perph->path, CAM_DEBUG_SUBTRACE,
3069                           ("   added periph to queue\n"));
3070                 perph->pinfo.priority = new_priority;
3071                 perph->pinfo.generation = ++device->drvq.generation;
3072                 camq_insert(&device->drvq, &perph->pinfo);
3073                 runq = xpt_schedule_dev_allocq(perph->path->bus, device);
3074         }
3075         if (runq != 0) {
3076                 CAM_DEBUG(perph->path, CAM_DEBUG_SUBTRACE,
3077                           ("   calling xpt_run_devq\n"));
3078                 xpt_run_dev_allocq(perph->path->bus);
3079         }
3080 }
3081
3082
3083 /*
3084  * Schedule a device to run on a given queue.
3085  * If the device was inserted as a new entry on the queue,
3086  * return 1 meaning the device queue should be run. If we
3087  * were already queued, implying someone else has already
3088  * started the queue, return 0 so the caller doesn't attempt
3089  * to run the queue.
3090  */
3091 int
3092 xpt_schedule_dev(struct camq *queue, cam_pinfo *pinfo,
3093                  u_int32_t new_priority)
3094 {
3095         int retval;
3096         u_int32_t old_priority;
3097
3098         CAM_DEBUG_PRINT(CAM_DEBUG_XPT, ("xpt_schedule_dev\n"));
3099
3100         old_priority = pinfo->priority;
3101
3102         /*
3103          * Are we already queued?
3104          */
3105         if (pinfo->index != CAM_UNQUEUED_INDEX) {
3106                 /* Simply reorder based on new priority */
3107                 if (new_priority < old_priority) {
3108                         camq_change_priority(queue, pinfo->index,
3109                                              new_priority);
3110                         CAM_DEBUG_PRINT(CAM_DEBUG_XPT,
3111                                         ("changed priority to %d\n",
3112                                          new_priority));
3113                 }
3114                 retval = 0;
3115         } else {
3116                 /* New entry on the queue */
3117                 if (new_priority < old_priority)
3118                         pinfo->priority = new_priority;
3119
3120                 CAM_DEBUG_PRINT(CAM_DEBUG_XPT,
3121                                 ("Inserting onto queue\n"));
3122                 pinfo->generation = ++queue->generation;
3123                 camq_insert(queue, pinfo);
3124                 retval = 1;
3125         }
3126         return (retval);
3127 }
3128
3129 static void
3130 xpt_run_dev_allocq(struct cam_eb *bus)
3131 {
3132         struct  cam_devq *devq;
3133
3134         CAM_DEBUG_PRINT(CAM_DEBUG_XPT, ("xpt_run_dev_allocq\n"));
3135         devq = bus->sim->devq;
3136
3137         CAM_DEBUG_PRINT(CAM_DEBUG_XPT,
3138                         ("   qfrozen_cnt == 0x%x, entries == %d, "
3139                          "openings == %d, active == %d\n",
3140                          devq->alloc_queue.qfrozen_cnt,
3141                          devq->alloc_queue.entries,
3142                          devq->alloc_openings,
3143                          devq->alloc_active));
3144
3145         devq->alloc_queue.qfrozen_cnt++;
3146         while ((devq->alloc_queue.entries > 0)
3147             && (devq->alloc_openings > 0)
3148             && (devq->alloc_queue.qfrozen_cnt <= 1)) {
3149                 struct  cam_ed_qinfo *qinfo;
3150                 struct  cam_ed *device;
3151                 union   ccb *work_ccb;
3152                 struct  cam_periph *drv;
3153                 struct  camq *drvq;
3154
3155                 qinfo = (struct cam_ed_qinfo *)camq_remove(&devq->alloc_queue,
3156                                                            CAMQ_HEAD);
3157                 device = qinfo->device;
3158
3159                 CAM_DEBUG_PRINT(CAM_DEBUG_XPT,
3160                                 ("running device %p\n", device));
3161
3162                 drvq = &device->drvq;
3163
3164 #ifdef CAMDEBUG
3165                 if (drvq->entries <= 0) {
3166                         panic("xpt_run_dev_allocq: "
3167                               "Device on queue without any work to do");
3168                 }
3169 #endif
3170                 if ((work_ccb = xpt_get_ccb(device)) != NULL) {
3171                         devq->alloc_openings--;
3172                         devq->alloc_active++;
3173                         drv = (struct cam_periph*)camq_remove(drvq, CAMQ_HEAD);
3174                         xpt_setup_ccb(&work_ccb->ccb_h, drv->path,
3175                                       drv->pinfo.priority);
3176                         CAM_DEBUG_PRINT(CAM_DEBUG_XPT,
3177                                         ("calling periph start\n"));
3178                         drv->periph_start(drv, work_ccb);
3179                 } else {
3180                         /*
3181                          * Malloc failure in alloc_ccb
3182                          */
3183                         /*
3184                          * XXX add us to a list to be run from free_ccb
3185                          * if we don't have any ccbs active on this
3186                          * device queue otherwise we may never get run
3187                          * again.
3188                          */
3189                         break;
3190                 }
3191
3192                 if (drvq->entries > 0) {
3193                         /* We have more work.  Attempt to reschedule */
3194                         xpt_schedule_dev_allocq(bus, device);
3195                 }
3196         }
3197         devq->alloc_queue.qfrozen_cnt--;
3198 }
3199
3200 void
3201 xpt_run_dev_sendq(struct cam_eb *bus)
3202 {
3203         struct  cam_devq *devq;
3204
3205         CAM_DEBUG_PRINT(CAM_DEBUG_XPT, ("xpt_run_dev_sendq\n"));
3206
3207         devq = bus->sim->devq;
3208
3209         devq->send_queue.qfrozen_cnt++;
3210         while ((devq->send_queue.entries > 0)
3211             && (devq->send_openings > 0)) {
3212                 struct  cam_ed_qinfo *qinfo;
3213                 struct  cam_ed *device;
3214                 union ccb *work_ccb;
3215                 struct  cam_sim *sim;
3216
3217                 if (devq->send_queue.qfrozen_cnt > 1) {
3218                         break;
3219                 }
3220
3221                 qinfo = (struct cam_ed_qinfo *)camq_remove(&devq->send_queue,
3222                                                            CAMQ_HEAD);
3223                 device = qinfo->device;
3224
3225                 /*
3226                  * If the device has been "frozen", don't attempt
3227                  * to run it.
3228                  */
3229                 if (device->qfrozen_cnt > 0) {
3230                         continue;
3231                 }
3232
3233                 CAM_DEBUG_PRINT(CAM_DEBUG_XPT,
3234                                 ("running device %p\n", device));
3235
3236                 work_ccb = cam_ccbq_peek_ccb(&device->ccbq, CAMQ_HEAD);
3237                 if (work_ccb == NULL) {
3238                         printf("device on run queue with no ccbs???\n");
3239                         continue;
3240                 }
3241
3242                 if ((work_ccb->ccb_h.flags & CAM_HIGH_POWER) != 0) {
3243
3244                         mtx_lock(&xsoftc.xpt_lock);
3245                         if (xsoftc.num_highpower <= 0) {
3246                                 /*
3247                                  * We got a high power command, but we
3248                                  * don't have any available slots.  Freeze
3249                                  * the device queue until we have a slot
3250                                  * available.
3251                                  */
3252                                 device->qfrozen_cnt++;
3253                                 STAILQ_INSERT_TAIL(&xsoftc.highpowerq,
3254                                                    &work_ccb->ccb_h,
3255                                                    xpt_links.stqe);
3256
3257                                 mtx_unlock(&xsoftc.xpt_lock);
3258                                 continue;
3259                         } else {
3260                                 /*
3261                                  * Consume a high power slot while
3262                                  * this ccb runs.
3263                                  */
3264                                 xsoftc.num_highpower--;
3265                         }
3266                         mtx_unlock(&xsoftc.xpt_lock);
3267                 }
3268                 devq->active_dev = device;
3269                 cam_ccbq_remove_ccb(&device->ccbq, work_ccb);
3270
3271                 cam_ccbq_send_ccb(&device->ccbq, work_ccb);
3272
3273                 devq->send_openings--;
3274                 devq->send_active++;
3275
3276                 if (device->ccbq.queue.entries > 0)
3277                         xpt_schedule_dev_sendq(bus, device);
3278
3279                 if (work_ccb && (work_ccb->ccb_h.flags & CAM_DEV_QFREEZE) != 0){
3280                         /*
3281                          * The client wants to freeze the queue
3282                          * after this CCB is sent.
3283                          */
3284                         device->qfrozen_cnt++;
3285                 }
3286
3287                 /* In Target mode, the peripheral driver knows best... */
3288                 if (work_ccb->ccb_h.func_code == XPT_SCSI_IO) {
3289                         if ((device->inq_flags & SID_CmdQue) != 0
3290                          && work_ccb->csio.tag_action != CAM_TAG_ACTION_NONE)
3291                                 work_ccb->ccb_h.flags |= CAM_TAG_ACTION_VALID;
3292                         else
3293                                 /*
3294                                  * Clear this in case of a retried CCB that
3295                                  * failed due to a rejected tag.
3296                                  */
3297                                 work_ccb->ccb_h.flags &= ~CAM_TAG_ACTION_VALID;
3298                 }
3299
3300                 /*
3301                  * Device queues can be shared among multiple sim instances
3302                  * that reside on different busses.  Use the SIM in the queue
3303                  * CCB's path, rather than the one in the bus that was passed
3304                  * into this function.
3305                  */
3306                 sim = work_ccb->ccb_h.path->bus->sim;
3307                 (*(sim->sim_action))(sim, work_ccb);
3308
3309                 devq->active_dev = NULL;
3310         }
3311         devq->send_queue.qfrozen_cnt--;
3312 }
3313
3314 /*
3315  * This function merges stuff from the slave ccb into the master ccb, while
3316  * keeping important fields in the master ccb constant.
3317  */
3318 void
3319 xpt_merge_ccb(union ccb *master_ccb, union ccb *slave_ccb)
3320 {
3321
3322         /*
3323          * Pull fields that are valid for peripheral drivers to set
3324          * into the master CCB along with the CCB "payload".
3325          */
3326         master_ccb->ccb_h.retry_count = slave_ccb->ccb_h.retry_count;
3327         master_ccb->ccb_h.func_code = slave_ccb->ccb_h.func_code;
3328         master_ccb->ccb_h.timeout = slave_ccb->ccb_h.timeout;
3329         master_ccb->ccb_h.flags = slave_ccb->ccb_h.flags;
3330         bcopy(&(&slave_ccb->ccb_h)[1], &(&master_ccb->ccb_h)[1],
3331               sizeof(union ccb) - sizeof(struct ccb_hdr));
3332 }
3333
3334 void
3335 xpt_setup_ccb(struct ccb_hdr *ccb_h, struct cam_path *path, u_int32_t priority)
3336 {
3337
3338         CAM_DEBUG(path, CAM_DEBUG_TRACE, ("xpt_setup_ccb\n"));
3339         ccb_h->pinfo.priority = priority;
3340         ccb_h->path = path;
3341         ccb_h->path_id = path->bus->path_id;
3342         if (path->target)
3343                 ccb_h->target_id = path->target->target_id;
3344         else
3345                 ccb_h->target_id = CAM_TARGET_WILDCARD;
3346         if (path->device) {
3347                 ccb_h->target_lun = path->device->lun_id;
3348                 ccb_h->pinfo.generation = ++path->device->ccbq.queue.generation;
3349         } else {
3350                 ccb_h->target_lun = CAM_TARGET_WILDCARD;
3351         }
3352         ccb_h->pinfo.index = CAM_UNQUEUED_INDEX;
3353         ccb_h->flags = 0;
3354 }
3355
3356 /* Path manipulation functions */
3357 cam_status
3358 xpt_create_path(struct cam_path **new_path_ptr, struct cam_periph *perph,
3359                 path_id_t path_id, target_id_t target_id, lun_id_t lun_id)
3360 {
3361         struct     cam_path *path;
3362         cam_status status;
3363
3364         path = (struct cam_path *)malloc(sizeof(*path), M_CAMXPT, M_NOWAIT);
3365
3366         if (path == NULL) {
3367                 status = CAM_RESRC_UNAVAIL;
3368                 return(status);
3369         }
3370         status = xpt_compile_path(path, perph, path_id, target_id, lun_id);
3371         if (status != CAM_REQ_CMP) {
3372                 free(path, M_CAMXPT);
3373                 path = NULL;
3374         }
3375         *new_path_ptr = path;
3376         return (status);
3377 }
3378
3379 cam_status
3380 xpt_create_path_unlocked(struct cam_path **new_path_ptr,
3381                          struct cam_periph *periph, path_id_t path_id,
3382                          target_id_t target_id, lun_id_t lun_id)
3383 {
3384         struct     cam_path *path;
3385         struct     cam_eb *bus = NULL;
3386         cam_status status;
3387         int        need_unlock = 0;
3388
3389         path = (struct cam_path *)malloc(sizeof(*path), M_CAMXPT, M_WAITOK);
3390
3391         if (path_id != CAM_BUS_WILDCARD) {
3392                 bus = xpt_find_bus(path_id);
3393                 if (bus != NULL) {
3394                         need_unlock = 1;
3395                         CAM_SIM_LOCK(bus->sim);
3396                 }
3397         }
3398         status = xpt_compile_path(path, periph, path_id, target_id, lun_id);
3399         if (need_unlock)
3400                 CAM_SIM_UNLOCK(bus->sim);
3401         if (status != CAM_REQ_CMP) {
3402                 free(path, M_CAMXPT);
3403                 path = NULL;
3404         }
3405         *new_path_ptr = path;
3406         return (status);
3407 }
3408
3409 cam_status
3410 xpt_compile_path(struct cam_path *new_path, struct cam_periph *perph,
3411                  path_id_t path_id, target_id_t target_id, lun_id_t lun_id)
3412 {
3413         struct       cam_eb *bus;
3414         struct       cam_et *target;
3415         struct       cam_ed *device;
3416         cam_status   status;
3417
3418         status = CAM_REQ_CMP;   /* Completed without error */
3419         target = NULL;          /* Wildcarded */
3420         device = NULL;          /* Wildcarded */
3421
3422         /*
3423          * We will potentially modify the EDT, so block interrupts
3424          * that may attempt to create cam paths.
3425          */
3426         bus = xpt_find_bus(path_id);
3427         if (bus == NULL) {
3428                 status = CAM_PATH_INVALID;
3429         } else {
3430                 target = xpt_find_target(bus, target_id);
3431                 if (target == NULL) {
3432                         /* Create one */
3433                         struct cam_et *new_target;
3434
3435                         new_target = xpt_alloc_target(bus, target_id);
3436                         if (new_target == NULL) {
3437                                 status = CAM_RESRC_UNAVAIL;
3438                         } else {
3439                                 target = new_target;
3440                         }
3441                 }
3442                 if (target != NULL) {
3443                         device = xpt_find_device(target, lun_id);
3444                         if (device == NULL) {
3445                                 /* Create one */
3446                                 struct cam_ed *new_device;
3447
3448                                 new_device =
3449                                     (*(bus->xport->alloc_device))(bus,
3450                                                                       target,
3451                                                                       lun_id);
3452                                 if (new_device == NULL) {
3453                                         status = CAM_RESRC_UNAVAIL;
3454                                 } else {
3455                                         device = new_device;
3456                                 }
3457                         }
3458                 }
3459         }
3460
3461         /*
3462          * Only touch the user's data if we are successful.
3463          */
3464         if (status == CAM_REQ_CMP) {
3465                 new_path->periph = perph;
3466                 new_path->bus = bus;
3467                 new_path->target = target;
3468                 new_path->device = device;
3469                 CAM_DEBUG(new_path, CAM_DEBUG_TRACE, ("xpt_compile_path\n"));
3470         } else {
3471                 if (device != NULL)
3472                         xpt_release_device(bus, target, device);
3473                 if (target != NULL)
3474                         xpt_release_target(bus, target);
3475                 if (bus != NULL)
3476                         xpt_release_bus(bus);
3477         }
3478         return (status);
3479 }
3480
3481 void
3482 xpt_release_path(struct cam_path *path)
3483 {
3484         CAM_DEBUG(path, CAM_DEBUG_TRACE, ("xpt_release_path\n"));
3485         if (path->device != NULL) {
3486                 xpt_release_device(path->bus, path->target, path->device);
3487                 path->device = NULL;
3488         }
3489         if (path->target != NULL) {
3490                 xpt_release_target(path->bus, path->target);
3491                 path->target = NULL;
3492         }
3493         if (path->bus != NULL) {
3494                 xpt_release_bus(path->bus);
3495                 path->bus = NULL;
3496         }
3497 }
3498
3499 void
3500 xpt_free_path(struct cam_path *path)
3501 {
3502
3503         CAM_DEBUG(path, CAM_DEBUG_TRACE, ("xpt_free_path\n"));
3504         xpt_release_path(path);
3505         free(path, M_CAMXPT);
3506 }
3507
3508
3509 /*
3510  * Return -1 for failure, 0 for exact match, 1 for match with wildcards
3511  * in path1, 2 for match with wildcards in path2.
3512  */
3513 int
3514 xpt_path_comp(struct cam_path *path1, struct cam_path *path2)
3515 {
3516         int retval = 0;
3517
3518         if (path1->bus != path2->bus) {
3519                 if (path1->bus->path_id == CAM_BUS_WILDCARD)
3520                         retval = 1;
3521                 else if (path2->bus->path_id == CAM_BUS_WILDCARD)
3522                         retval = 2;
3523                 else
3524                         return (-1);
3525         }
3526         if (path1->target != path2->target) {
3527                 if (path1->target->target_id == CAM_TARGET_WILDCARD) {
3528                         if (retval == 0)
3529                                 retval = 1;
3530                 } else if (path2->target->target_id == CAM_TARGET_WILDCARD)
3531                         retval = 2;
3532                 else
3533                         return (-1);
3534         }
3535         if (path1->device != path2->device) {
3536                 if (path1->device->lun_id == CAM_LUN_WILDCARD) {
3537                         if (retval == 0)
3538                                 retval = 1;
3539                 } else if (path2->device->lun_id == CAM_LUN_WILDCARD)
3540                         retval = 2;
3541                 else
3542                         return (-1);
3543         }
3544         return (retval);
3545 }
3546
3547 void
3548 xpt_print_path(struct cam_path *path)
3549 {
3550
3551         if (path == NULL)
3552                 printf("(nopath): ");
3553         else {
3554                 if (path->periph != NULL)
3555                         printf("(%s%d:", path->periph->periph_name,
3556                                path->periph->unit_number);
3557                 else
3558                         printf("(noperiph:");
3559
3560                 if (path->bus != NULL)
3561                         printf("%s%d:%d:", path->bus->sim->sim_name,
3562                                path->bus->sim->unit_number,
3563                                path->bus->sim->bus_id);
3564                 else
3565                         printf("nobus:");
3566
3567                 if (path->target != NULL)
3568                         printf("%d:", path->target->target_id);
3569                 else
3570                         printf("X:");
3571
3572                 if (path->device != NULL)
3573                         printf("%d): ", path->device->lun_id);
3574                 else
3575                         printf("X): ");
3576         }
3577 }
3578
3579 void
3580 xpt_print(struct cam_path *path, const char *fmt, ...)
3581 {
3582         va_list ap;
3583         xpt_print_path(path);
3584         va_start(ap, fmt);
3585         vprintf(fmt, ap);
3586         va_end(ap);
3587 }
3588
3589 int
3590 xpt_path_string(struct cam_path *path, char *str, size_t str_len)
3591 {
3592         struct sbuf sb;
3593
3594 #ifdef INVARIANTS
3595         if (path != NULL && path->bus != NULL)
3596                 mtx_assert(path->bus->sim->mtx, MA_OWNED);
3597 #endif
3598
3599         sbuf_new(&sb, str, str_len, 0);
3600
3601         if (path == NULL)
3602                 sbuf_printf(&sb, "(nopath): ");
3603         else {
3604                 if (path->periph != NULL)
3605                         sbuf_printf(&sb, "(%s%d:", path->periph->periph_name,
3606                                     path->periph->unit_number);
3607                 else
3608                         sbuf_printf(&sb, "(noperiph:");
3609
3610                 if (path->bus != NULL)
3611                         sbuf_printf(&sb, "%s%d:%d:", path->bus->sim->sim_name,
3612                                     path->bus->sim->unit_number,
3613                                     path->bus->sim->bus_id);
3614                 else
3615                         sbuf_printf(&sb, "nobus:");
3616
3617                 if (path->target != NULL)
3618                         sbuf_printf(&sb, "%d:", path->target->target_id);
3619                 else
3620                         sbuf_printf(&sb, "X:");
3621
3622                 if (path->device != NULL)
3623                         sbuf_printf(&sb, "%d): ", path->device->lun_id);
3624                 else
3625                         sbuf_printf(&sb, "X): ");
3626         }
3627         sbuf_finish(&sb);
3628
3629         return(sbuf_len(&sb));
3630 }
3631
3632 path_id_t
3633 xpt_path_path_id(struct cam_path *path)
3634 {
3635         mtx_assert(path->bus->sim->mtx, MA_OWNED);
3636
3637         return(path->bus->path_id);
3638 }
3639
3640 target_id_t
3641 xpt_path_target_id(struct cam_path *path)
3642 {
3643         mtx_assert(path->bus->sim->mtx, MA_OWNED);
3644
3645         if (path->target != NULL)
3646                 return (path->target->target_id);
3647         else
3648                 return (CAM_TARGET_WILDCARD);
3649 }
3650
3651 lun_id_t
3652 xpt_path_lun_id(struct cam_path *path)
3653 {
3654         mtx_assert(path->bus->sim->mtx, MA_OWNED);
3655
3656         if (path->device != NULL)
3657                 return (path->device->lun_id);
3658         else
3659                 return (CAM_LUN_WILDCARD);
3660 }
3661
3662 struct cam_sim *
3663 xpt_path_sim(struct cam_path *path)
3664 {
3665
3666         return (path->bus->sim);
3667 }
3668
3669 struct cam_periph*
3670 xpt_path_periph(struct cam_path *path)
3671 {
3672         mtx_assert(path->bus->sim->mtx, MA_OWNED);
3673
3674         return (path->periph);
3675 }
3676
3677 /*
3678  * Release a CAM control block for the caller.  Remit the cost of the structure
3679  * to the device referenced by the path.  If the this device had no 'credits'
3680  * and peripheral drivers have registered async callbacks for this notification
3681  * call them now.
3682  */
3683 void
3684 xpt_release_ccb(union ccb *free_ccb)
3685 {
3686         struct   cam_path *path;
3687         struct   cam_ed *device;
3688         struct   cam_eb *bus;
3689         struct   cam_sim *sim;
3690
3691         CAM_DEBUG_PRINT(CAM_DEBUG_XPT, ("xpt_release_ccb\n"));
3692         path = free_ccb->ccb_h.path;
3693         device = path->device;
3694         bus = path->bus;
3695         sim = bus->sim;
3696
3697         mtx_assert(sim->mtx, MA_OWNED);
3698
3699         cam_ccbq_release_opening(&device->ccbq);
3700         if (sim->ccb_count > sim->max_ccbs) {
3701                 xpt_free_ccb(free_ccb);
3702                 sim->ccb_count--;
3703         } else {
3704                 SLIST_INSERT_HEAD(&sim->ccb_freeq, &free_ccb->ccb_h,
3705                     xpt_links.sle);
3706         }
3707         if (sim->devq == NULL) {
3708                 return;
3709         }
3710         sim->devq->alloc_openings++;
3711         sim->devq->alloc_active--;
3712         /* XXX Turn this into an inline function - xpt_run_device?? */
3713         if ((device_is_alloc_queued(device) == 0)
3714          && (device->drvq.entries > 0)) {
3715                 xpt_schedule_dev_allocq(bus, device);
3716         }
3717         if (dev_allocq_is_runnable(sim->devq))
3718                 xpt_run_dev_allocq(bus);
3719 }
3720
3721 /* Functions accessed by SIM drivers */
3722
3723 static struct xpt_xport xport_default = {
3724         .alloc_device = xpt_alloc_device_default,
3725         .action = xpt_action_default,
3726         .async = xpt_dev_async_default,
3727 };
3728
3729 /*
3730  * A sim structure, listing the SIM entry points and instance
3731  * identification info is passed to xpt_bus_register to hook the SIM
3732  * into the CAM framework.  xpt_bus_register creates a cam_eb entry
3733  * for this new bus and places it in the array of busses and assigns
3734  * it a path_id.  The path_id may be influenced by "hard wiring"
3735  * information specified by the user.  Once interrupt services are
3736  * available, the bus will be probed.
3737  */
3738 int32_t
3739 xpt_bus_register(struct cam_sim *sim, device_t parent, u_int32_t bus)
3740 {
3741         struct cam_eb *new_bus;
3742         struct cam_eb *old_bus;
3743         struct ccb_pathinq cpi;
3744         struct cam_path path;
3745         cam_status status;
3746
3747         mtx_assert(sim->mtx, MA_OWNED);
3748
3749         sim->bus_id = bus;
3750         new_bus = (struct cam_eb *)malloc(sizeof(*new_bus),
3751                                           M_CAMXPT, M_NOWAIT);
3752         if (new_bus == NULL) {
3753                 /* Couldn't satisfy request */
3754                 return (CAM_RESRC_UNAVAIL);
3755         }
3756
3757         if (strcmp(sim->sim_name, "xpt") != 0) {
3758                 sim->path_id =
3759                     xptpathid(sim->sim_name, sim->unit_number, sim->bus_id);
3760         }
3761
3762         TAILQ_INIT(&new_bus->et_entries);
3763         new_bus->path_id = sim->path_id;
3764         cam_sim_hold(sim);
3765         new_bus->sim = sim;
3766         timevalclear(&new_bus->last_reset);
3767         new_bus->flags = 0;
3768         new_bus->refcount = 1;  /* Held until a bus_deregister event */
3769         new_bus->generation = 0;
3770
3771         mtx_lock(&xsoftc.xpt_topo_lock);
3772         old_bus = TAILQ_FIRST(&xsoftc.xpt_busses);
3773         while (old_bus != NULL
3774             && old_bus->path_id < new_bus->path_id)
3775                 old_bus = TAILQ_NEXT(old_bus, links);
3776         if (old_bus != NULL)
3777                 TAILQ_INSERT_BEFORE(old_bus, new_bus, links);
3778         else
3779                 TAILQ_INSERT_TAIL(&xsoftc.xpt_busses, new_bus, links);
3780         xsoftc.bus_generation++;
3781         mtx_unlock(&xsoftc.xpt_topo_lock);
3782
3783         /*
3784          * Set a default transport so that a PATH_INQ can be issued to
3785          * the SIM.  This will then allow for probing and attaching of
3786          * a more appropriate transport.
3787          */
3788         new_bus->xport = &xport_default;
3789
3790         bzero(&path, sizeof(path));
3791         status = xpt_compile_path(&path, /*periph*/NULL, sim->path_id,
3792                                   CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD);
3793         if (status != CAM_REQ_CMP)
3794                 printf("xpt_compile_path returned %d\n", status);
3795
3796         xpt_setup_ccb(&cpi.ccb_h, &path, /*priority*/1);
3797         cpi.ccb_h.func_code = XPT_PATH_INQ;
3798         xpt_action((union ccb *)&cpi);
3799
3800         if (cpi.ccb_h.status == CAM_REQ_CMP) {
3801                 switch (cpi.transport) {
3802                 case XPORT_SPI:
3803                 case XPORT_SAS:
3804                 case XPORT_FC:
3805                 case XPORT_USB:
3806                         new_bus->xport = scsi_get_xport();
3807                         break;
3808                 case XPORT_ATA:
3809                 case XPORT_SATA:
3810                         new_bus->xport = ata_get_xport();
3811                         break;
3812                 default:
3813                         new_bus->xport = &xport_default;
3814                         break;
3815                 }
3816         }
3817
3818         /* Notify interested parties */
3819         if (sim->path_id != CAM_XPT_PATH_ID) {
3820                 xpt_async(AC_PATH_REGISTERED, &path, &cpi);
3821         }
3822         xpt_release_path(&path);
3823         return (CAM_SUCCESS);
3824 }
3825
3826 int32_t
3827 xpt_bus_deregister(path_id_t pathid)
3828 {
3829         struct cam_path bus_path;
3830         cam_status status;
3831
3832         status = xpt_compile_path(&bus_path, NULL, pathid,
3833                                   CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD);
3834         if (status != CAM_REQ_CMP)
3835                 return (status);
3836
3837         xpt_async(AC_LOST_DEVICE, &bus_path, NULL);
3838         xpt_async(AC_PATH_DEREGISTERED, &bus_path, NULL);
3839
3840         /* Release the reference count held while registered. */
3841         xpt_release_bus(bus_path.bus);
3842         xpt_release_path(&bus_path);
3843
3844         return (CAM_REQ_CMP);
3845 }
3846
3847 static path_id_t
3848 xptnextfreepathid(void)
3849 {
3850         struct cam_eb *bus;
3851         path_id_t pathid;
3852         const char *strval;
3853
3854         pathid = 0;
3855         mtx_lock(&xsoftc.xpt_topo_lock);
3856         bus = TAILQ_FIRST(&xsoftc.xpt_busses);
3857 retry:
3858         /* Find an unoccupied pathid */
3859         while (bus != NULL && bus->path_id <= pathid) {
3860                 if (bus->path_id == pathid)
3861                         pathid++;
3862                 bus = TAILQ_NEXT(bus, links);
3863         }
3864         mtx_unlock(&xsoftc.xpt_topo_lock);
3865
3866         /*
3867          * Ensure that this pathid is not reserved for
3868          * a bus that may be registered in the future.
3869          */
3870         if (resource_string_value("scbus", pathid, "at", &strval) == 0) {
3871                 ++pathid;
3872                 /* Start the search over */
3873                 mtx_lock(&xsoftc.xpt_topo_lock);
3874                 goto retry;
3875         }
3876         return (pathid);
3877 }
3878
3879 static path_id_t
3880 xptpathid(const char *sim_name, int sim_unit, int sim_bus)
3881 {
3882         path_id_t pathid;
3883         int i, dunit, val;
3884         char buf[32];
3885         const char *dname;
3886
3887         pathid = CAM_XPT_PATH_ID;
3888         snprintf(buf, sizeof(buf), "%s%d", sim_name, sim_unit);
3889         i = 0;
3890         while ((resource_find_match(&i, &dname, &dunit, "at", buf)) == 0) {
3891                 if (strcmp(dname, "scbus")) {
3892                         /* Avoid a bit of foot shooting. */
3893                         continue;
3894                 }
3895                 if (dunit < 0)          /* unwired?! */
3896                         continue;
3897                 if (resource_int_value("scbus", dunit, "bus", &val) == 0) {
3898                         if (sim_bus == val) {
3899                                 pathid = dunit;
3900                                 break;
3901                         }
3902                 } else if (sim_bus == 0) {
3903                         /* Unspecified matches bus 0 */
3904                         pathid = dunit;
3905                         break;
3906                 } else {
3907                         printf("Ambiguous scbus configuration for %s%d "
3908                                "bus %d, cannot wire down.  The kernel "
3909                                "config entry for scbus%d should "
3910                                "specify a controller bus.\n"
3911                                "Scbus will be assigned dynamically.\n",
3912                                sim_name, sim_unit, sim_bus, dunit);
3913                         break;
3914                 }
3915         }
3916
3917         if (pathid == CAM_XPT_PATH_ID)
3918                 pathid = xptnextfreepathid();
3919         return (pathid);
3920 }
3921
3922 void
3923 xpt_async(u_int32_t async_code, struct cam_path *path, void *async_arg)
3924 {
3925         struct cam_eb *bus;
3926         struct cam_et *target, *next_target;
3927         struct cam_ed *device, *next_device;
3928
3929         mtx_assert(path->bus->sim->mtx, MA_OWNED);
3930
3931         CAM_DEBUG(path, CAM_DEBUG_TRACE, ("xpt_async\n"));
3932
3933         /*
3934          * Most async events come from a CAM interrupt context.  In
3935          * a few cases, the error recovery code at the peripheral layer,
3936          * which may run from our SWI or a process context, may signal
3937          * deferred events with a call to xpt_async.
3938          */
3939
3940         bus = path->bus;
3941
3942         if (async_code == AC_BUS_RESET) {
3943                 /* Update our notion of when the last reset occurred */
3944                 microtime(&bus->last_reset);
3945         }
3946
3947         for (target = TAILQ_FIRST(&bus->et_entries);
3948              target != NULL;
3949              target = next_target) {
3950
3951                 next_target = TAILQ_NEXT(target, links);
3952
3953                 if (path->target != target
3954                  && path->target->target_id != CAM_TARGET_WILDCARD
3955                  && target->target_id != CAM_TARGET_WILDCARD)
3956                         continue;
3957
3958                 if (async_code == AC_SENT_BDR) {
3959                         /* Update our notion of when the last reset occurred */
3960                         microtime(&path->target->last_reset);
3961                 }
3962
3963                 for (device = TAILQ_FIRST(&target->ed_entries);
3964                      device != NULL;
3965                      device = next_device) {
3966
3967                         next_device = TAILQ_NEXT(device, links);
3968
3969                         if (path->device != device
3970                          && path->device->lun_id != CAM_LUN_WILDCARD
3971                          && device->lun_id != CAM_LUN_WILDCARD)
3972                                 continue;
3973
3974                         (*(bus->xport->async))(async_code, bus,
3975                                                target, device,
3976                                                async_arg);
3977
3978                         xpt_async_bcast(&device->asyncs, async_code,
3979                                         path, async_arg);
3980                 }
3981         }
3982
3983         /*
3984          * If this wasn't a fully wildcarded async, tell all
3985          * clients that want all async events.
3986          */
3987         if (bus != xpt_periph->path->bus)
3988                 xpt_async_bcast(&xpt_periph->path->device->asyncs, async_code,
3989                                 path, async_arg);
3990 }
3991
3992 static void
3993 xpt_async_bcast(struct async_list *async_head,
3994                 u_int32_t async_code,
3995                 struct cam_path *path, void *async_arg)
3996 {
3997         struct async_node *cur_entry;
3998
3999         cur_entry = SLIST_FIRST(async_head);
4000         while (cur_entry != NULL) {
4001                 struct async_node *next_entry;
4002                 /*
4003                  * Grab the next list entry before we call the current
4004                  * entry's callback.  This is because the callback function
4005                  * can delete its async callback entry.
4006                  */
4007                 next_entry = SLIST_NEXT(cur_entry, links);
4008                 if ((cur_entry->event_enable & async_code) != 0)
4009                         cur_entry->callback(cur_entry->callback_arg,
4010                                             async_code, path,
4011                                             async_arg);
4012                 cur_entry = next_entry;
4013         }
4014 }
4015
4016 static void
4017 xpt_dev_async_default(u_int32_t async_code, struct cam_eb *bus,
4018                       struct cam_et *target, struct cam_ed *device,
4019                       void *async_arg)
4020 {
4021         printf("xpt_dev_async called\n");
4022 }
4023
4024 u_int32_t
4025 xpt_freeze_devq(struct cam_path *path, u_int count)
4026 {
4027         struct ccb_hdr *ccbh;
4028
4029         mtx_assert(path->bus->sim->mtx, MA_OWNED);
4030
4031         path->device->qfrozen_cnt += count;
4032
4033         /*
4034          * Mark the last CCB in the queue as needing
4035          * to be requeued if the driver hasn't
4036          * changed it's state yet.  This fixes a race
4037          * where a ccb is just about to be queued to
4038          * a controller driver when it's interrupt routine
4039          * freezes the queue.  To completly close the
4040          * hole, controller drives must check to see
4041          * if a ccb's status is still CAM_REQ_INPROG
4042          * just before they queue
4043          * the CCB.  See ahc_action/ahc_freeze_devq for
4044          * an example.
4045          */
4046         ccbh = TAILQ_LAST(&path->device->ccbq.active_ccbs, ccb_hdr_tailq);
4047         if (ccbh && ccbh->status == CAM_REQ_INPROG)
4048                 ccbh->status = CAM_REQUEUE_REQ;
4049         return (path->device->qfrozen_cnt);
4050 }
4051
4052 u_int32_t
4053 xpt_freeze_simq(struct cam_sim *sim, u_int count)
4054 {
4055         mtx_assert(sim->mtx, MA_OWNED);
4056
4057         sim->devq->send_queue.qfrozen_cnt += count;
4058         if (sim->devq->active_dev != NULL) {
4059                 struct ccb_hdr *ccbh;
4060
4061                 ccbh = TAILQ_LAST(&sim->devq->active_dev->ccbq.active_ccbs,
4062                                   ccb_hdr_tailq);
4063                 if (ccbh && ccbh->status == CAM_REQ_INPROG)
4064                         ccbh->status = CAM_REQUEUE_REQ;
4065         }
4066         return (sim->devq->send_queue.qfrozen_cnt);
4067 }
4068
4069 static void
4070 xpt_release_devq_timeout(void *arg)
4071 {
4072         struct cam_ed *device;
4073
4074         device = (struct cam_ed *)arg;
4075
4076         xpt_release_devq_device(device, /*count*/1, /*run_queue*/TRUE);
4077 }
4078
4079 void
4080 xpt_release_devq(struct cam_path *path, u_int count, int run_queue)
4081 {
4082         mtx_assert(path->bus->sim->mtx, MA_OWNED);
4083
4084         xpt_release_devq_device(path->device, count, run_queue);
4085 }
4086
4087 static void
4088 xpt_release_devq_device(struct cam_ed *dev, u_int count, int run_queue)
4089 {
4090         int     rundevq;
4091
4092         rundevq = 0;
4093         if (dev->qfrozen_cnt > 0) {
4094
4095                 count = (count > dev->qfrozen_cnt) ? dev->qfrozen_cnt : count;
4096                 dev->qfrozen_cnt -= count;
4097                 if (dev->qfrozen_cnt == 0) {
4098
4099                         /*
4100                          * No longer need to wait for a successful
4101                          * command completion.
4102                          */
4103                         dev->flags &= ~CAM_DEV_REL_ON_COMPLETE;
4104
4105                         /*
4106                          * Remove any timeouts that might be scheduled
4107                          * to release this queue.
4108                          */
4109                         if ((dev->flags & CAM_DEV_REL_TIMEOUT_PENDING) != 0) {
4110                                 callout_stop(&dev->callout);
4111                                 dev->flags &= ~CAM_DEV_REL_TIMEOUT_PENDING;
4112                         }
4113
4114                         /*
4115                          * Now that we are unfrozen schedule the
4116                          * device so any pending transactions are
4117                          * run.
4118                          */
4119                         if ((dev->ccbq.queue.entries > 0)
4120                          && (xpt_schedule_dev_sendq(dev->target->bus, dev))
4121                          && (run_queue != 0)) {
4122                                 rundevq = 1;
4123                         }
4124                 }
4125         }
4126         if (rundevq != 0)
4127                 xpt_run_dev_sendq(dev->target->bus);
4128 }
4129
4130 void
4131 xpt_release_simq(struct cam_sim *sim, int run_queue)
4132 {
4133         struct  camq *sendq;
4134
4135         mtx_assert(sim->mtx, MA_OWNED);
4136
4137         sendq = &(sim->devq->send_queue);
4138         if (sendq->qfrozen_cnt > 0) {
4139
4140                 sendq->qfrozen_cnt--;
4141                 if (sendq->qfrozen_cnt == 0) {
4142                         struct cam_eb *bus;
4143
4144                         /*
4145                          * If there is a timeout scheduled to release this
4146                          * sim queue, remove it.  The queue frozen count is
4147                          * already at 0.
4148                          */
4149                         if ((sim->flags & CAM_SIM_REL_TIMEOUT_PENDING) != 0){
4150                                 callout_stop(&sim->callout);
4151                                 sim->flags &= ~CAM_SIM_REL_TIMEOUT_PENDING;
4152                         }
4153                         bus = xpt_find_bus(sim->path_id);
4154
4155                         if (run_queue) {
4156                                 /*
4157                                  * Now that we are unfrozen run the send queue.
4158                                  */
4159                                 xpt_run_dev_sendq(bus);
4160                         }
4161                         xpt_release_bus(bus);
4162                 }
4163         }
4164 }
4165
4166 /*
4167  * XXX Appears to be unused.
4168  */
4169 static void
4170 xpt_release_simq_timeout(void *arg)
4171 {
4172         struct cam_sim *sim;
4173
4174         sim = (struct cam_sim *)arg;
4175         xpt_release_simq(sim, /* run_queue */ TRUE);
4176 }
4177
4178 void
4179 xpt_done(union ccb *done_ccb)
4180 {
4181         struct cam_sim *sim;
4182
4183         CAM_DEBUG(done_ccb->ccb_h.path, CAM_DEBUG_TRACE, ("xpt_done\n"));
4184         if ((done_ccb->ccb_h.func_code & XPT_FC_QUEUED) != 0) {
4185                 /*
4186                  * Queue up the request for handling by our SWI handler
4187                  * any of the "non-immediate" type of ccbs.
4188                  */
4189                 sim = done_ccb->ccb_h.path->bus->sim;
4190                 switch (done_ccb->ccb_h.path->periph->type) {
4191                 case CAM_PERIPH_BIO:
4192                         TAILQ_INSERT_TAIL(&sim->sim_doneq, &done_ccb->ccb_h,
4193                                           sim_links.tqe);
4194                         done_ccb->ccb_h.pinfo.index = CAM_DONEQ_INDEX;
4195                         if ((sim->flags & CAM_SIM_ON_DONEQ) == 0) {
4196                                 mtx_lock(&cam_simq_lock);
4197                                 TAILQ_INSERT_TAIL(&cam_simq, sim,
4198                                                   links);
4199                                 sim->flags |= CAM_SIM_ON_DONEQ;
4200                                 mtx_unlock(&cam_simq_lock);
4201                         }
4202                         if ((done_ccb->ccb_h.path->periph->flags &
4203                             CAM_PERIPH_POLLED) == 0)
4204                                 swi_sched(cambio_ih, 0);
4205                         break;
4206                 default:
4207                         panic("unknown periph type %d",
4208                             done_ccb->ccb_h.path->periph->type);
4209                 }
4210         }
4211 }
4212
4213 union ccb *
4214 xpt_alloc_ccb()
4215 {
4216         union ccb *new_ccb;
4217
4218         new_ccb = malloc(sizeof(*new_ccb), M_CAMXPT, M_ZERO|M_WAITOK);
4219         return (new_ccb);
4220 }
4221
4222 union ccb *
4223 xpt_alloc_ccb_nowait()
4224 {
4225         union ccb *new_ccb;
4226
4227         new_ccb = malloc(sizeof(*new_ccb), M_CAMXPT, M_ZERO|M_NOWAIT);
4228         return (new_ccb);
4229 }
4230
4231 void
4232 xpt_free_ccb(union ccb *free_ccb)
4233 {
4234         free(free_ccb, M_CAMXPT);
4235 }
4236
4237
4238
4239 /* Private XPT functions */
4240
4241 /*
4242  * Get a CAM control block for the caller. Charge the structure to the device
4243  * referenced by the path.  If the this device has no 'credits' then the
4244  * device already has the maximum number of outstanding operations under way
4245  * and we return NULL. If we don't have sufficient resources to allocate more
4246  * ccbs, we also return NULL.
4247  */
4248 static union ccb *
4249 xpt_get_ccb(struct cam_ed *device)
4250 {
4251         union ccb *new_ccb;
4252         struct cam_sim *sim;
4253
4254         sim = device->sim;
4255         if ((new_ccb = (union ccb *)SLIST_FIRST(&sim->ccb_freeq)) == NULL) {
4256                 new_ccb = xpt_alloc_ccb_nowait();
4257                 if (new_ccb == NULL) {
4258                         return (NULL);
4259                 }
4260                 if ((sim->flags & CAM_SIM_MPSAFE) == 0)
4261                         callout_handle_init(&new_ccb->ccb_h.timeout_ch);
4262                 SLIST_INSERT_HEAD(&sim->ccb_freeq, &new_ccb->ccb_h,
4263                                   xpt_links.sle);
4264                 sim->ccb_count++;
4265         }
4266         cam_ccbq_take_opening(&device->ccbq);
4267         SLIST_REMOVE_HEAD(&sim->ccb_freeq, xpt_links.sle);
4268         return (new_ccb);
4269 }
4270
4271 static void
4272 xpt_release_bus(struct cam_eb *bus)
4273 {
4274
4275         if ((--bus->refcount == 0)
4276          && (TAILQ_FIRST(&bus->et_entries) == NULL)) {
4277                 mtx_lock(&xsoftc.xpt_topo_lock);
4278                 TAILQ_REMOVE(&xsoftc.xpt_busses, bus, links);
4279                 xsoftc.bus_generation++;
4280                 mtx_unlock(&xsoftc.xpt_topo_lock);
4281                 cam_sim_release(bus->sim);
4282                 free(bus, M_CAMXPT);
4283         }
4284 }
4285
4286 static struct cam_et *
4287 xpt_alloc_target(struct cam_eb *bus, target_id_t target_id)
4288 {
4289         struct cam_et *target;
4290
4291         target = (struct cam_et *)malloc(sizeof(*target), M_CAMXPT, M_NOWAIT);
4292         if (target != NULL) {
4293                 struct cam_et *cur_target;
4294
4295                 TAILQ_INIT(&target->ed_entries);
4296                 target->bus = bus;
4297                 target->target_id = target_id;
4298                 target->refcount = 1;
4299                 target->generation = 0;
4300                 timevalclear(&target->last_reset);
4301                 /*
4302                  * Hold a reference to our parent bus so it
4303                  * will not go away before we do.
4304                  */
4305                 bus->refcount++;
4306
4307                 /* Insertion sort into our bus's target list */
4308                 cur_target = TAILQ_FIRST(&bus->et_entries);
4309                 while (cur_target != NULL && cur_target->target_id < target_id)
4310                         cur_target = TAILQ_NEXT(cur_target, links);
4311
4312                 if (cur_target != NULL) {
4313                         TAILQ_INSERT_BEFORE(cur_target, target, links);
4314                 } else {
4315                         TAILQ_INSERT_TAIL(&bus->et_entries, target, links);
4316                 }
4317                 bus->generation++;
4318         }
4319         return (target);
4320 }
4321
4322 static void
4323 xpt_release_target(struct cam_eb *bus, struct cam_et *target)
4324 {
4325
4326         if ((--target->refcount == 0)
4327          && (TAILQ_FIRST(&target->ed_entries) == NULL)) {
4328                 TAILQ_REMOVE(&bus->et_entries, target, links);
4329                 bus->generation++;
4330                 free(target, M_CAMXPT);
4331                 xpt_release_bus(bus);
4332         }
4333 }
4334
4335 static struct cam_ed *
4336 xpt_alloc_device_default(struct cam_eb *bus, struct cam_et *target,
4337                          lun_id_t lun_id)
4338 {
4339         struct cam_ed *device, *cur_device;
4340
4341         device = xpt_alloc_device(bus, target, lun_id);
4342         if (device == NULL)
4343                 return (NULL);
4344
4345         device->mintags = 1;
4346         device->maxtags = 1;
4347         bus->sim->max_ccbs = device->ccbq.devq_openings;
4348         cur_device = TAILQ_FIRST(&target->ed_entries);
4349         while (cur_device != NULL && cur_device->lun_id < lun_id)
4350                 cur_device = TAILQ_NEXT(cur_device, links);
4351         if (cur_device != NULL) {
4352                 TAILQ_INSERT_BEFORE(cur_device, device, links);
4353         } else {
4354                 TAILQ_INSERT_TAIL(&target->ed_entries, device, links);
4355         }
4356         target->generation++;
4357
4358         return (device);
4359 }
4360
4361 struct cam_ed *
4362 xpt_alloc_device(struct cam_eb *bus, struct cam_et *target, lun_id_t lun_id)
4363 {
4364         struct     cam_ed *device;
4365         struct     cam_devq *devq;
4366         cam_status status;
4367
4368         /* Make space for us in the device queue on our bus */
4369         devq = bus->sim->devq;
4370         status = cam_devq_resize(devq, devq->alloc_queue.array_size + 1);
4371
4372         if (status != CAM_REQ_CMP) {
4373                 device = NULL;
4374         } else {
4375                 device = (struct cam_ed *)malloc(sizeof(*device),
4376                                                  M_CAMXPT, M_NOWAIT);
4377         }
4378
4379         if (device != NULL) {
4380                 cam_init_pinfo(&device->alloc_ccb_entry.pinfo);
4381                 device->alloc_ccb_entry.device = device;
4382                 cam_init_pinfo(&device->send_ccb_entry.pinfo);
4383                 device->send_ccb_entry.device = device;
4384                 device->target = target;
4385                 device->lun_id = lun_id;
4386                 device->sim = bus->sim;
4387                 /* Initialize our queues */
4388                 if (camq_init(&device->drvq, 0) != 0) {
4389                         free(device, M_CAMXPT);
4390                         return (NULL);
4391                 }
4392                 if (cam_ccbq_init(&device->ccbq,
4393                                   bus->sim->max_dev_openings) != 0) {
4394                         camq_fini(&device->drvq);
4395                         free(device, M_CAMXPT);
4396                         return (NULL);
4397                 }
4398                 SLIST_INIT(&device->asyncs);
4399                 SLIST_INIT(&device->periphs);
4400                 device->generation = 0;
4401                 device->owner = NULL;
4402                 device->qfrozen_cnt = 0;
4403                 device->flags = CAM_DEV_UNCONFIGURED;
4404                 device->tag_delay_count = 0;
4405                 device->tag_saved_openings = 0;
4406                 device->refcount = 1;
4407                 if (bus->sim->flags & CAM_SIM_MPSAFE)
4408                         callout_init_mtx(&device->callout, bus->sim->mtx, 0);
4409                 else
4410                         callout_init_mtx(&device->callout, &Giant, 0);
4411
4412                 /*
4413                  * Hold a reference to our parent target so it
4414                  * will not go away before we do.
4415                  */
4416                 target->refcount++;
4417
4418         }
4419         return (device);
4420 }
4421
4422 static void
4423 xpt_release_device(struct cam_eb *bus, struct cam_et *target,
4424                    struct cam_ed *device)
4425 {
4426
4427         if ((--device->refcount == 0)
4428          && ((device->flags & CAM_DEV_UNCONFIGURED) != 0)) {
4429                 struct cam_devq *devq;
4430
4431                 if (device->alloc_ccb_entry.pinfo.index != CAM_UNQUEUED_INDEX
4432                  || device->send_ccb_entry.pinfo.index != CAM_UNQUEUED_INDEX)
4433                         panic("Removing device while still queued for ccbs");
4434
4435                 if ((device->flags & CAM_DEV_REL_TIMEOUT_PENDING) != 0)
4436                                 callout_stop(&device->callout);
4437
4438                 TAILQ_REMOVE(&target->ed_entries, device,links);
4439                 target->generation++;
4440                 bus->sim->max_ccbs -= device->ccbq.devq_openings;
4441                 /* Release our slot in the devq */
4442                 devq = bus->sim->devq;
4443                 cam_devq_resize(devq, devq->alloc_queue.array_size - 1);
4444                 camq_fini(&device->drvq);
4445                 camq_fini(&device->ccbq.queue);
4446                 free(device, M_CAMXPT);
4447                 xpt_release_target(bus, target);
4448         }
4449 }
4450
4451 u_int32_t
4452 xpt_dev_ccbq_resize(struct cam_path *path, int newopenings)
4453 {
4454         int     diff;
4455         int     result;
4456         struct  cam_ed *dev;
4457
4458         dev = path->device;
4459
4460         diff = newopenings - (dev->ccbq.dev_active + dev->ccbq.dev_openings);
4461         result = cam_ccbq_resize(&dev->ccbq, newopenings);
4462         if (result == CAM_REQ_CMP && (diff < 0)) {
4463                 dev->flags |= CAM_DEV_RESIZE_QUEUE_NEEDED;
4464         }
4465         if ((dev->flags & CAM_DEV_TAG_AFTER_COUNT) != 0
4466          || (dev->inq_flags & SID_CmdQue) != 0)
4467                 dev->tag_saved_openings = newopenings;
4468         /* Adjust the global limit */
4469         dev->sim->max_ccbs += diff;
4470         return (result);
4471 }
4472
4473 static struct cam_eb *
4474 xpt_find_bus(path_id_t path_id)
4475 {
4476         struct cam_eb *bus;
4477
4478         mtx_lock(&xsoftc.xpt_topo_lock);
4479         for (bus = TAILQ_FIRST(&xsoftc.xpt_busses);
4480              bus != NULL;
4481              bus = TAILQ_NEXT(bus, links)) {
4482                 if (bus->path_id == path_id) {
4483                         bus->refcount++;
4484                         break;
4485                 }
4486         }
4487         mtx_unlock(&xsoftc.xpt_topo_lock);
4488         return (bus);
4489 }
4490
4491 static struct cam_et *
4492 xpt_find_target(struct cam_eb *bus, target_id_t target_id)
4493 {
4494         struct cam_et *target;
4495
4496         for (target = TAILQ_FIRST(&bus->et_entries);
4497              target != NULL;
4498              target = TAILQ_NEXT(target, links)) {
4499                 if (target->target_id == target_id) {
4500                         target->refcount++;
4501                         break;
4502                 }
4503         }
4504         return (target);
4505 }
4506
4507 static struct cam_ed *
4508 xpt_find_device(struct cam_et *target, lun_id_t lun_id)
4509 {
4510         struct cam_ed *device;
4511
4512         for (device = TAILQ_FIRST(&target->ed_entries);
4513              device != NULL;
4514              device = TAILQ_NEXT(device, links)) {
4515                 if (device->lun_id == lun_id) {
4516                         device->refcount++;
4517                         break;
4518                 }
4519         }
4520         return (device);
4521 }
4522
4523 static void
4524 xpt_start_tags(struct cam_path *path)
4525 {
4526         struct ccb_relsim crs;
4527         struct cam_ed *device;
4528         struct cam_sim *sim;
4529         int    newopenings;
4530
4531         device = path->device;
4532         sim = path->bus->sim;
4533         device->flags &= ~CAM_DEV_TAG_AFTER_COUNT;
4534         xpt_freeze_devq(path, /*count*/1);
4535         device->inq_flags |= SID_CmdQue;
4536         if (device->tag_saved_openings != 0)
4537                 newopenings = device->tag_saved_openings;
4538         else
4539                 newopenings = min(device->maxtags,
4540                                   sim->max_tagged_dev_openings);
4541         xpt_dev_ccbq_resize(path, newopenings);
4542         xpt_setup_ccb(&crs.ccb_h, path, /*priority*/1);
4543         crs.ccb_h.func_code = XPT_REL_SIMQ;
4544         crs.release_flags = RELSIM_RELEASE_AFTER_QEMPTY;
4545         crs.openings
4546             = crs.release_timeout
4547             = crs.qfrozen_cnt
4548             = 0;
4549         xpt_action((union ccb *)&crs);
4550 }
4551
4552 static int busses_to_config;
4553 static int busses_to_reset;
4554
4555 static int
4556 xptconfigbuscountfunc(struct cam_eb *bus, void *arg)
4557 {
4558
4559         mtx_assert(bus->sim->mtx, MA_OWNED);
4560
4561         if (bus->path_id != CAM_XPT_PATH_ID) {
4562                 struct cam_path path;
4563                 struct ccb_pathinq cpi;
4564                 int can_negotiate;
4565
4566                 busses_to_config++;
4567                 xpt_compile_path(&path, NULL, bus->path_id,
4568                                  CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD);
4569                 xpt_setup_ccb(&cpi.ccb_h, &path, /*priority*/1);
4570                 cpi.ccb_h.func_code = XPT_PATH_INQ;
4571                 xpt_action((union ccb *)&cpi);
4572                 can_negotiate = cpi.hba_inquiry;
4573                 can_negotiate &= (PI_WIDE_32|PI_WIDE_16|PI_SDTR_ABLE);
4574                 if ((cpi.hba_misc & PIM_NOBUSRESET) == 0
4575                  && can_negotiate)
4576                         busses_to_reset++;
4577                 xpt_release_path(&path);
4578         }
4579
4580         return(1);
4581 }
4582
4583 static int
4584 xptconfigfunc(struct cam_eb *bus, void *arg)
4585 {
4586         struct  cam_path *path;
4587         union   ccb *work_ccb;
4588
4589         mtx_assert(bus->sim->mtx, MA_OWNED);
4590
4591         if (bus->path_id != CAM_XPT_PATH_ID) {
4592                 cam_status status;
4593                 int can_negotiate;
4594
4595                 work_ccb = xpt_alloc_ccb_nowait();
4596                 if (work_ccb == NULL) {
4597                         busses_to_config--;
4598                         xpt_finishconfig(xpt_periph, NULL);
4599                         return(0);
4600                 }
4601                 if ((status = xpt_create_path(&path, xpt_periph, bus->path_id,
4602                                               CAM_TARGET_WILDCARD,
4603                                               CAM_LUN_WILDCARD)) !=CAM_REQ_CMP){
4604                         printf("xptconfigfunc: xpt_create_path failed with "
4605                                "status %#x for bus %d\n", status, bus->path_id);
4606                         printf("xptconfigfunc: halting bus configuration\n");
4607                         xpt_free_ccb(work_ccb);
4608                         busses_to_config--;
4609                         xpt_finishconfig(xpt_periph, NULL);
4610                         return(0);
4611                 }
4612                 xpt_setup_ccb(&work_ccb->ccb_h, path, /*priority*/1);
4613                 work_ccb->ccb_h.func_code = XPT_PATH_INQ;
4614                 xpt_action(work_ccb);
4615                 if (work_ccb->ccb_h.status != CAM_REQ_CMP) {
4616                         printf("xptconfigfunc: CPI failed on bus %d "
4617                                "with status %d\n", bus->path_id,
4618                                work_ccb->ccb_h.status);
4619                         xpt_finishconfig(xpt_periph, work_ccb);
4620                         return(1);
4621                 }
4622
4623                 can_negotiate = work_ccb->cpi.hba_inquiry;
4624                 can_negotiate &= (PI_WIDE_32|PI_WIDE_16|PI_SDTR_ABLE);
4625                 if ((work_ccb->cpi.hba_misc & PIM_NOBUSRESET) == 0
4626                  && (can_negotiate != 0)) {
4627                         xpt_setup_ccb(&work_ccb->ccb_h, path, /*priority*/1);
4628                         work_ccb->ccb_h.func_code = XPT_RESET_BUS;
4629                         work_ccb->ccb_h.cbfcnp = NULL;
4630                         CAM_DEBUG(path, CAM_DEBUG_SUBTRACE,
4631                                   ("Resetting Bus\n"));
4632                         xpt_action(work_ccb);
4633                         xpt_finishconfig(xpt_periph, work_ccb);
4634                 } else {
4635                         /* Act as though we performed a successful BUS RESET */
4636                         work_ccb->ccb_h.func_code = XPT_RESET_BUS;
4637                         xpt_finishconfig(xpt_periph, work_ccb);
4638                 }
4639         }
4640
4641         return(1);
4642 }
4643
4644 static void
4645 xpt_config(void *arg)
4646 {
4647         /*
4648          * Now that interrupts are enabled, go find our devices
4649          */
4650
4651 #ifdef CAMDEBUG
4652         /* Setup debugging flags and path */
4653 #ifdef CAM_DEBUG_FLAGS
4654         cam_dflags = CAM_DEBUG_FLAGS;
4655 #else /* !CAM_DEBUG_FLAGS */
4656         cam_dflags = CAM_DEBUG_NONE;
4657 #endif /* CAM_DEBUG_FLAGS */
4658 #ifdef CAM_DEBUG_BUS
4659         if (cam_dflags != CAM_DEBUG_NONE) {
4660                 /*
4661                  * Locking is specifically omitted here.  No SIMs have
4662                  * registered yet, so xpt_create_path will only be searching
4663                  * empty lists of targets and devices.
4664                  */
4665                 if (xpt_create_path(&cam_dpath, xpt_periph,
4666                                     CAM_DEBUG_BUS, CAM_DEBUG_TARGET,
4667                                     CAM_DEBUG_LUN) != CAM_REQ_CMP) {
4668                         printf("xpt_config: xpt_create_path() failed for debug"
4669                                " target %d:%d:%d, debugging disabled\n",
4670                                CAM_DEBUG_BUS, CAM_DEBUG_TARGET, CAM_DEBUG_LUN);
4671                         cam_dflags = CAM_DEBUG_NONE;
4672                 }
4673         } else
4674                 cam_dpath = NULL;
4675 #else /* !CAM_DEBUG_BUS */
4676         cam_dpath = NULL;
4677 #endif /* CAM_DEBUG_BUS */
4678 #endif /* CAMDEBUG */
4679
4680         /*
4681          * Scan all installed busses.
4682          */
4683         xpt_for_all_busses(xptconfigbuscountfunc, NULL);
4684
4685         if (busses_to_config == 0) {
4686                 /* Call manually because we don't have any busses */
4687                 xpt_finishconfig(xpt_periph, NULL);
4688         } else  {
4689                 if (busses_to_reset > 0 && scsi_delay >= 2000) {
4690                         printf("Waiting %d seconds for SCSI "
4691                                "devices to settle\n", scsi_delay/1000);
4692                 }
4693                 xpt_for_all_busses(xptconfigfunc, NULL);
4694         }
4695 }
4696
4697 /*
4698  * If the given device only has one peripheral attached to it, and if that
4699  * peripheral is the passthrough driver, announce it.  This insures that the
4700  * user sees some sort of announcement for every peripheral in their system.
4701  */
4702 static int
4703 xptpassannouncefunc(struct cam_ed *device, void *arg)
4704 {
4705         struct cam_periph *periph;
4706         int i;
4707
4708         for (periph = SLIST_FIRST(&device->periphs), i = 0; periph != NULL;
4709              periph = SLIST_NEXT(periph, periph_links), i++);
4710
4711         periph = SLIST_FIRST(&device->periphs);
4712         if ((i == 1)
4713          && (strncmp(periph->periph_name, "pass", 4) == 0))
4714                 xpt_announce_periph(periph, NULL);
4715
4716         return(1);
4717 }
4718
4719 static void
4720 xpt_finishconfig_task(void *context, int pending)
4721 {
4722         struct  periph_driver **p_drv;
4723         int     i;
4724
4725         if (busses_to_config == 0) {
4726                 /* Register all the peripheral drivers */
4727                 /* XXX This will have to change when we have loadable modules */
4728                 p_drv = periph_drivers;
4729                 for (i = 0; p_drv[i] != NULL; i++) {
4730                         (*p_drv[i]->init)();
4731                 }
4732
4733                 /*
4734                  * Check for devices with no "standard" peripheral driver
4735                  * attached.  For any devices like that, announce the
4736                  * passthrough driver so the user will see something.
4737                  */
4738                 xpt_for_all_devices(xptpassannouncefunc, NULL);
4739
4740                 /* Release our hook so that the boot can continue. */
4741                 config_intrhook_disestablish(xsoftc.xpt_config_hook);
4742                 free(xsoftc.xpt_config_hook, M_CAMXPT);
4743                 xsoftc.xpt_config_hook = NULL;
4744         }
4745
4746         free(context, M_CAMXPT);
4747 }
4748
4749 static void
4750 xpt_finishconfig(struct cam_periph *periph, union ccb *done_ccb)
4751 {
4752         struct  xpt_task *task;
4753
4754         if (done_ccb != NULL) {
4755                 CAM_DEBUG(done_ccb->ccb_h.path, CAM_DEBUG_TRACE,
4756                           ("xpt_finishconfig\n"));
4757                 switch(done_ccb->ccb_h.func_code) {
4758                 case XPT_RESET_BUS:
4759                         if (done_ccb->ccb_h.status == CAM_REQ_CMP) {
4760                                 done_ccb->ccb_h.func_code = XPT_SCAN_BUS;
4761                                 done_ccb->ccb_h.cbfcnp = xpt_finishconfig;
4762                                 done_ccb->crcn.flags = 0;
4763                                 xpt_action(done_ccb);
4764                                 return;
4765                         }
4766                         /* FALLTHROUGH */
4767                 case XPT_SCAN_BUS:
4768                 default:
4769                         xpt_free_path(done_ccb->ccb_h.path);
4770                         busses_to_config--;
4771                         break;
4772                 }
4773         }
4774
4775         if (busses_to_config == 0) {
4776                 task = malloc(sizeof(struct xpt_task), M_CAMXPT, M_NOWAIT);
4777                 if (task != NULL) {
4778                         TASK_INIT(&task->task, 0, xpt_finishconfig_task, task);
4779                         taskqueue_enqueue(taskqueue_thread, &task->task);
4780                 }
4781         }
4782
4783         if (done_ccb != NULL)
4784                 xpt_free_ccb(done_ccb);
4785 }
4786
4787 cam_status
4788 xpt_register_async(int event, ac_callback_t *cbfunc, void *cbarg,
4789                    struct cam_path *path)
4790 {
4791         struct ccb_setasync csa;
4792         cam_status status;
4793         int xptpath = 0;
4794
4795         if (path == NULL) {
4796                 mtx_lock(&xsoftc.xpt_lock);
4797                 status = xpt_create_path(&path, /*periph*/NULL, CAM_XPT_PATH_ID,
4798                                          CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD);
4799                 if (status != CAM_REQ_CMP) {
4800                         mtx_unlock(&xsoftc.xpt_lock);
4801                         return (status);
4802                 }
4803                 xptpath = 1;
4804         }
4805
4806         xpt_setup_ccb(&csa.ccb_h, path, /*priority*/5);
4807         csa.ccb_h.func_code = XPT_SASYNC_CB;
4808         csa.event_enable = event;
4809         csa.callback = cbfunc;
4810         csa.callback_arg = cbarg;
4811         xpt_action((union ccb *)&csa);
4812         status = csa.ccb_h.status;
4813         if (xptpath) {
4814                 xpt_free_path(path);
4815                 mtx_unlock(&xsoftc.xpt_lock);
4816         }
4817         return (status);
4818 }
4819
4820 static void
4821 xptaction(struct cam_sim *sim, union ccb *work_ccb)
4822 {
4823         CAM_DEBUG(work_ccb->ccb_h.path, CAM_DEBUG_TRACE, ("xptaction\n"));
4824
4825         switch (work_ccb->ccb_h.func_code) {
4826         /* Common cases first */
4827         case XPT_PATH_INQ:              /* Path routing inquiry */
4828         {
4829                 struct ccb_pathinq *cpi;
4830
4831                 cpi = &work_ccb->cpi;
4832                 cpi->version_num = 1; /* XXX??? */
4833                 cpi->hba_inquiry = 0;
4834                 cpi->target_sprt = 0;
4835                 cpi->hba_misc = 0;
4836                 cpi->hba_eng_cnt = 0;
4837                 cpi->max_target = 0;
4838                 cpi->max_lun = 0;
4839                 cpi->initiator_id = 0;
4840                 strncpy(cpi->sim_vid, "FreeBSD", SIM_IDLEN);
4841                 strncpy(cpi->hba_vid, "", HBA_IDLEN);
4842                 strncpy(cpi->dev_name, sim->sim_name, DEV_IDLEN);
4843                 cpi->unit_number = sim->unit_number;
4844                 cpi->bus_id = sim->bus_id;
4845                 cpi->base_transfer_speed = 0;
4846                 cpi->protocol = PROTO_UNSPECIFIED;
4847                 cpi->protocol_version = PROTO_VERSION_UNSPECIFIED;
4848                 cpi->transport = XPORT_UNSPECIFIED;
4849                 cpi->transport_version = XPORT_VERSION_UNSPECIFIED;
4850                 cpi->ccb_h.status = CAM_REQ_CMP;
4851                 xpt_done(work_ccb);
4852                 break;
4853         }
4854         default:
4855                 work_ccb->ccb_h.status = CAM_REQ_INVALID;
4856                 xpt_done(work_ccb);
4857                 break;
4858         }
4859 }
4860
4861 /*
4862  * The xpt as a "controller" has no interrupt sources, so polling
4863  * is a no-op.
4864  */
4865 static void
4866 xptpoll(struct cam_sim *sim)
4867 {
4868 }
4869
4870 void
4871 xpt_lock_buses(void)
4872 {
4873         mtx_lock(&xsoftc.xpt_topo_lock);
4874 }
4875
4876 void
4877 xpt_unlock_buses(void)
4878 {
4879         mtx_unlock(&xsoftc.xpt_topo_lock);
4880 }
4881
4882 static void
4883 camisr(void *dummy)
4884 {
4885         cam_simq_t queue;
4886         struct cam_sim *sim;
4887
4888         mtx_lock(&cam_simq_lock);
4889         TAILQ_INIT(&queue);
4890         TAILQ_CONCAT(&queue, &cam_simq, links);
4891         mtx_unlock(&cam_simq_lock);
4892
4893         while ((sim = TAILQ_FIRST(&queue)) != NULL) {
4894                 TAILQ_REMOVE(&queue, sim, links);
4895                 CAM_SIM_LOCK(sim);
4896                 sim->flags &= ~CAM_SIM_ON_DONEQ;
4897                 camisr_runqueue(&sim->sim_doneq);
4898                 CAM_SIM_UNLOCK(sim);
4899         }
4900 }
4901
4902 static void
4903 camisr_runqueue(void *V_queue)
4904 {
4905         cam_isrq_t *queue = V_queue;
4906         struct  ccb_hdr *ccb_h;
4907
4908         while ((ccb_h = TAILQ_FIRST(queue)) != NULL) {
4909                 int     runq;
4910
4911                 TAILQ_REMOVE(queue, ccb_h, sim_links.tqe);
4912                 ccb_h->pinfo.index = CAM_UNQUEUED_INDEX;
4913
4914                 CAM_DEBUG(ccb_h->path, CAM_DEBUG_TRACE,
4915                           ("camisr\n"));
4916
4917                 runq = FALSE;
4918
4919                 if (ccb_h->flags & CAM_HIGH_POWER) {
4920                         struct highpowerlist    *hphead;
4921                         union ccb               *send_ccb;
4922
4923                         mtx_lock(&xsoftc.xpt_lock);
4924                         hphead = &xsoftc.highpowerq;
4925
4926                         send_ccb = (union ccb *)STAILQ_FIRST(hphead);
4927
4928                         /*
4929                          * Increment the count since this command is done.
4930                          */
4931                         xsoftc.num_highpower++;
4932
4933                         /*
4934                          * Any high powered commands queued up?
4935                          */
4936                         if (send_ccb != NULL) {
4937
4938                                 STAILQ_REMOVE_HEAD(hphead, xpt_links.stqe);
4939                                 mtx_unlock(&xsoftc.xpt_lock);
4940
4941                                 xpt_release_devq(send_ccb->ccb_h.path,
4942                                                  /*count*/1, /*runqueue*/TRUE);
4943                         } else
4944                                 mtx_unlock(&xsoftc.xpt_lock);
4945                 }
4946
4947                 if ((ccb_h->func_code & XPT_FC_USER_CCB) == 0) {
4948                         struct cam_ed *dev;
4949
4950                         dev = ccb_h->path->device;
4951
4952                         cam_ccbq_ccb_done(&dev->ccbq, (union ccb *)ccb_h);
4953                         ccb_h->path->bus->sim->devq->send_active--;
4954                         ccb_h->path->bus->sim->devq->send_openings++;
4955
4956                         if (((dev->flags & CAM_DEV_REL_ON_COMPLETE) != 0
4957                           && (ccb_h->status&CAM_STATUS_MASK) != CAM_REQUEUE_REQ)
4958                          || ((dev->flags & CAM_DEV_REL_ON_QUEUE_EMPTY) != 0
4959                           && (dev->ccbq.dev_active == 0))) {
4960
4961                                 xpt_release_devq(ccb_h->path, /*count*/1,
4962                                                  /*run_queue*/TRUE);
4963                         }
4964
4965                         if ((dev->flags & CAM_DEV_TAG_AFTER_COUNT) != 0
4966                          && (--dev->tag_delay_count == 0))
4967                                 xpt_start_tags(ccb_h->path);
4968
4969                         if ((dev->ccbq.queue.entries > 0)
4970                          && (dev->qfrozen_cnt == 0)
4971                          && (device_is_send_queued(dev) == 0)) {
4972                                 runq = xpt_schedule_dev_sendq(ccb_h->path->bus,
4973                                                               dev);
4974                         }
4975                 }
4976
4977                 if (ccb_h->status & CAM_RELEASE_SIMQ) {
4978                         xpt_release_simq(ccb_h->path->bus->sim,
4979                                          /*run_queue*/TRUE);
4980                         ccb_h->status &= ~CAM_RELEASE_SIMQ;
4981                         runq = FALSE;
4982                 }
4983
4984                 if ((ccb_h->flags & CAM_DEV_QFRZDIS)
4985                  && (ccb_h->status & CAM_DEV_QFRZN)) {
4986                         xpt_release_devq(ccb_h->path, /*count*/1,
4987                                          /*run_queue*/TRUE);
4988                         ccb_h->status &= ~CAM_DEV_QFRZN;
4989                 } else if (runq) {
4990                         xpt_run_dev_sendq(ccb_h->path->bus);
4991                 }
4992
4993                 /* Call the peripheral driver's callback */
4994                 (*ccb_h->cbfcnp)(ccb_h->path->periph, (union ccb *)ccb_h);
4995         }
4996 }
4997