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/interrupt.h>
  43 #include <sys/proc.h>
  44 #include <sys/sbuf.h>
  45 #include <sys/smp.h>
  46 #include <sys/taskqueue.h>
  47
  48 #include <sys/lock.h>
  49 #include <sys/mutex.h>
  50 #include <sys/sysctl.h>
  51 #include <sys/kthread.h>
  52
  53 #include <cam/cam.h>
  54 #include <cam/cam_ccb.h>
  55 #include <cam/cam_periph.h>
  56 #include <cam/cam_queue.h>
  57 #include <cam/cam_sim.h>
  58 #include <cam/cam_xpt.h>
  59 #include <cam/cam_xpt_sim.h>
  60 #include <cam/cam_xpt_periph.h>
  61 #include <cam/cam_xpt_internal.h>
  62 #include <cam/cam_debug.h>
  63 #include <cam/cam_compat.h>
  64
  65 #include <cam/scsi/scsi_all.h>
  66 #include <cam/scsi/scsi_message.h>
  67 #include <cam/scsi/scsi_pass.h>
  68
  69 #include <machine/md_var.h>     /* geometry translation */
  70 #include <machine/stdarg.h>     /* for xpt_print below */
  71
  72 #include "opt_cam.h"
  73
  74 /*
  75  * This is the maximum number of high powered commands (e.g. start unit)
  76  * that can be outstanding at a particular time.
  77  */
  78 #ifndef CAM_MAX_HIGHPOWER
  79 #define CAM_MAX_HIGHPOWER  4
  80 #endif
  81
  82 /* Datastructures internal to the xpt layer */
  83 MALLOC_DEFINE(M_CAMXPT, "CAM XPT", "CAM XPT buffers");
  84 MALLOC_DEFINE(M_CAMDEV, "CAM DEV", "CAM devices");
  85 MALLOC_DEFINE(M_CAMCCB, "CAM CCB", "CAM CCBs");
  86 MALLOC_DEFINE(M_CAMPATH, "CAM path", "CAM paths");
  87
  88 /* Object for defering XPT actions to a taskqueue */
  89 struct xpt_task {
  90         struct task     task;
  91         void            *data1;
  92         uintptr_t       data2;
  93 };
  94
  95 struct xpt_softc {
  96         /* number of high powered commands that can go through right now */
  97         struct mtx              xpt_highpower_lock;
  98         STAILQ_HEAD(highpowerlist, cam_ed)      highpowerq;
  99         int                     num_highpower;
 100
 101         /* queue for handling async rescan requests. */
 102         TAILQ_HEAD(, ccb_hdr) ccb_scanq;
 103         int buses_to_config;
 104         int buses_config_done;
 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         int                     boot_delay;
 113         struct callout          boot_callout;
 114
 115         struct mtx              xpt_topo_lock;
 116         struct mtx              xpt_lock;
 117         struct taskqueue        *xpt_taskq;
 118 };
 119
 120 typedef enum {
 121         DM_RET_COPY             = 0x01,
 122         DM_RET_FLAG_MASK        = 0x0f,
 123         DM_RET_NONE             = 0x00,
 124         DM_RET_STOP             = 0x10,
 125         DM_RET_DESCEND          = 0x20,
 126         DM_RET_ERROR            = 0x30,
 127         DM_RET_ACTION_MASK      = 0xf0
 128 } dev_match_ret;
 129
 130 typedef enum {
 131         XPT_DEPTH_BUS,
 132         XPT_DEPTH_TARGET,
 133         XPT_DEPTH_DEVICE,
 134         XPT_DEPTH_PERIPH
 135 } xpt_traverse_depth;
 136
 137 struct xpt_traverse_config {
 138         xpt_traverse_depth      depth;
 139         void                    *tr_func;
 140         void                    *tr_arg;
 141 };
 142
 143 typedef int     xpt_busfunc_t (struct cam_eb *bus, void *arg);
 144 typedef int     xpt_targetfunc_t (struct cam_et *target, void *arg);
 145 typedef int     xpt_devicefunc_t (struct cam_ed *device, void *arg);
 146 typedef int     xpt_periphfunc_t (struct cam_periph *periph, void *arg);
 147 typedef int     xpt_pdrvfunc_t (struct periph_driver **pdrv, void *arg);
 148
 149 /* Transport layer configuration information */
 150 static struct xpt_softc xsoftc;
 151
 152 SYSCTL_INT(_kern_cam, OID_AUTO, boot_delay, CTLFLAG_RDTUN,
 153            &xsoftc.boot_delay, 0, "Bus registration wait time");
 154
 155 struct cam_doneq {
 156         struct mtx_padalign     cam_doneq_mtx;
 157         STAILQ_HEAD(, ccb_hdr)  cam_doneq;
 158         int                     cam_doneq_sleep;
 159 };
 160
 161 static struct cam_doneq cam_doneqs[MAXCPU];
 162 static int cam_num_doneqs;
 163 static struct proc *cam_proc;
 164
 165 SYSCTL_INT(_kern_cam, OID_AUTO, num_doneqs, CTLFLAG_RDTUN,
 166            &cam_num_doneqs, 0, "Number of completion queues/threads");
 167
 168 struct cam_periph *xpt_periph;
 169
 170 static periph_init_t xpt_periph_init;
 171
 172 static struct periph_driver xpt_driver =
 173 {
 174         xpt_periph_init, "xpt",
 175         TAILQ_HEAD_INITIALIZER(xpt_driver.units), /* generation */ 0,
 176         CAM_PERIPH_DRV_EARLY
 177 };
 178
 179 PERIPHDRIVER_DECLARE(xpt, xpt_driver);
 180
 181 static d_open_t xptopen;
 182 static d_close_t xptclose;
 183 static d_ioctl_t xptioctl;
 184 static d_ioctl_t xptdoioctl;
 185
 186 static struct cdevsw xpt_cdevsw = {
 187         .d_version =    D_VERSION,
 188         .d_flags =      0,
 189         .d_open =       xptopen,
 190         .d_close =      xptclose,
 191         .d_ioctl =      xptioctl,
 192         .d_name =       "xpt",
 193 };
 194
 195 /* Storage for debugging datastructures */
 196 struct cam_path *cam_dpath;
 197 u_int32_t cam_dflags = CAM_DEBUG_FLAGS;
 198 SYSCTL_UINT(_kern_cam, OID_AUTO, dflags, CTLFLAG_RWTUN,
 199         &cam_dflags, 0, "Enabled debug flags");
 200 u_int32_t cam_debug_delay = CAM_DEBUG_DELAY;
 201 SYSCTL_UINT(_kern_cam, OID_AUTO, debug_delay, CTLFLAG_RWTUN,
 202         &cam_debug_delay, 0, "Delay in us after each debug message");
 203
 204 /* Our boot-time initialization hook */
 205 static int cam_module_event_handler(module_t, int /*modeventtype_t*/, void *);
 206
 207 static moduledata_t cam_moduledata = {
 208         "cam",
 209         cam_module_event_handler,
 210         NULL
 211 };
 212
 213 static int      xpt_init(void *);
 214
 215 DECLARE_MODULE(cam, cam_moduledata, SI_SUB_CONFIGURE, SI_ORDER_SECOND);
 216 MODULE_VERSION(cam, 1);
 217
 218
 219 static void             xpt_async_bcast(struct async_list *async_head,
 220                                         u_int32_t async_code,
 221                                         struct cam_path *path,
 222                                         void *async_arg);
 223 static path_id_t xptnextfreepathid(void);
 224 static path_id_t xptpathid(const char *sim_name, int sim_unit, int sim_bus);
 225 static union ccb *xpt_get_ccb(struct cam_periph *periph);
 226 static union ccb *xpt_get_ccb_nowait(struct cam_periph *periph);
 227 static void      xpt_run_allocq(struct cam_periph *periph, int sleep);
 228 static void      xpt_run_allocq_task(void *context, int pending);
 229 static void      xpt_run_devq(struct cam_devq *devq);
 230 static timeout_t xpt_release_devq_timeout;
 231 static void      xpt_release_simq_timeout(void *arg) __unused;
 232 static void      xpt_acquire_bus(struct cam_eb *bus);
 233 static void      xpt_release_bus(struct cam_eb *bus);
 234 static uint32_t  xpt_freeze_devq_device(struct cam_ed *dev, u_int count);
 235 static int       xpt_release_devq_device(struct cam_ed *dev, u_int count,
 236                     int run_queue);
 237 static struct cam_et*
 238                  xpt_alloc_target(struct cam_eb *bus, target_id_t target_id);
 239 static void      xpt_acquire_target(struct cam_et *target);
 240 static void      xpt_release_target(struct cam_et *target);
 241 static struct cam_eb*
 242                  xpt_find_bus(path_id_t path_id);
 243 static struct cam_et*
 244                  xpt_find_target(struct cam_eb *bus, target_id_t target_id);
 245 static struct cam_ed*
 246                  xpt_find_device(struct cam_et *target, lun_id_t lun_id);
 247 static void      xpt_config(void *arg);
 248 static int       xpt_schedule_dev(struct camq *queue, cam_pinfo *dev_pinfo,
 249                                  u_int32_t new_priority);
 250 static xpt_devicefunc_t xptpassannouncefunc;
 251 static void      xptaction(struct cam_sim *sim, union ccb *work_ccb);
 252 static void      xptpoll(struct cam_sim *sim);
 253 static void      camisr_runqueue(void);
 254 static void      xpt_done_process(struct ccb_hdr *ccb_h);
 255 static void      xpt_done_td(void *);
 256 static dev_match_ret    xptbusmatch(struct dev_match_pattern *patterns,
 257                                     u_int num_patterns, struct cam_eb *bus);
 258 static dev_match_ret    xptdevicematch(struct dev_match_pattern *patterns,
 259                                        u_int num_patterns,
 260                                        struct cam_ed *device);
 261 static dev_match_ret    xptperiphmatch(struct dev_match_pattern *patterns,
 262                                        u_int num_patterns,
 263                                        struct cam_periph *periph);
 264 static xpt_busfunc_t    xptedtbusfunc;
 265 static xpt_targetfunc_t xptedttargetfunc;
 266 static xpt_devicefunc_t xptedtdevicefunc;
 267 static xpt_periphfunc_t xptedtperiphfunc;
 268 static xpt_pdrvfunc_t   xptplistpdrvfunc;
 269 static xpt_periphfunc_t xptplistperiphfunc;
 270 static int              xptedtmatch(struct ccb_dev_match *cdm);
 271 static int              xptperiphlistmatch(struct ccb_dev_match *cdm);
 272 static int              xptbustraverse(struct cam_eb *start_bus,
 273                                        xpt_busfunc_t *tr_func, void *arg);
 274 static int              xpttargettraverse(struct cam_eb *bus,
 275                                           struct cam_et *start_target,
 276                                           xpt_targetfunc_t *tr_func, void *arg);
 277 static int              xptdevicetraverse(struct cam_et *target,
 278                                           struct cam_ed *start_device,
 279                                           xpt_devicefunc_t *tr_func, void *arg);
 280 static int              xptperiphtraverse(struct cam_ed *device,
 281                                           struct cam_periph *start_periph,
 282                                           xpt_periphfunc_t *tr_func, void *arg);
 283 static int              xptpdrvtraverse(struct periph_driver **start_pdrv,
 284                                         xpt_pdrvfunc_t *tr_func, void *arg);
 285 static int              xptpdperiphtraverse(struct periph_driver **pdrv,
 286                                             struct cam_periph *start_periph,
 287                                             xpt_periphfunc_t *tr_func,
 288                                             void *arg);
 289 static xpt_busfunc_t    xptdefbusfunc;
 290 static xpt_targetfunc_t xptdeftargetfunc;
 291 static xpt_devicefunc_t xptdefdevicefunc;
 292 static xpt_periphfunc_t xptdefperiphfunc;
 293 static void             xpt_finishconfig_task(void *context, int pending);
 294 static void             xpt_dev_async_default(u_int32_t async_code,
 295                                               struct cam_eb *bus,
 296                                               struct cam_et *target,
 297                                               struct cam_ed *device,
 298                                               void *async_arg);
 299 static struct cam_ed *  xpt_alloc_device_default(struct cam_eb *bus,
 300                                                  struct cam_et *target,
 301                                                  lun_id_t lun_id);
 302 static xpt_devicefunc_t xptsetasyncfunc;
 303 static xpt_busfunc_t    xptsetasyncbusfunc;
 304 static cam_status       xptregister(struct cam_periph *periph,
 305                                     void *arg);
 306 static __inline int device_is_queued(struct cam_ed *device);
 307
 308 static __inline int
 309 xpt_schedule_devq(struct cam_devq *devq, struct cam_ed *dev)
 310 {
 311         int     retval;
 312
 313         mtx_assert(&devq->send_mtx, MA_OWNED);
 314         if ((dev->ccbq.queue.entries > 0) &&
 315             (dev->ccbq.dev_openings > 0) &&
 316             (dev->ccbq.queue.qfrozen_cnt == 0)) {
 317                 /*
 318                  * The priority of a device waiting for controller
 319                  * resources is that of the highest priority CCB
 320                  * enqueued.
 321                  */
 322                 retval =
 323                     xpt_schedule_dev(&devq->send_queue,
 324                                      &dev->devq_entry,
 325                                      CAMQ_GET_PRIO(&dev->ccbq.queue));
 326         } else {
 327                 retval = 0;
 328         }
 329         return (retval);
 330 }
 331
 332 static __inline int
 333 device_is_queued(struct cam_ed *device)
 334 {
 335         return (device->devq_entry.index != CAM_UNQUEUED_INDEX);
 336 }
 337
 338 static void
 339 xpt_periph_init()
 340 {
 341         make_dev(&xpt_cdevsw, 0, UID_ROOT, GID_OPERATOR, 0600, "xpt0");
 342 }
 343
 344 static int
 345 xptopen(struct cdev *dev, int flags, int fmt, struct thread *td)
 346 {
 347
 348         /*
 349          * Only allow read-write access.
 350          */
 351         if (((flags & FWRITE) == 0) || ((flags & FREAD) == 0))
 352                 return(EPERM);
 353
 354         /*
 355          * We don't allow nonblocking access.
 356          */
 357         if ((flags & O_NONBLOCK) != 0) {
 358                 printf("%s: can't do nonblocking access\n", devtoname(dev));
 359                 return(ENODEV);
 360         }
 361
 362         return(0);
 363 }
 364
 365 static int
 366 xptclose(struct cdev *dev, int flag, int fmt, struct thread *td)
 367 {
 368
 369         return(0);
 370 }
 371
 372 /*
 373  * Don't automatically grab the xpt softc lock here even though this is going
 374  * through the xpt device.  The xpt device is really just a back door for
 375  * accessing other devices and SIMs, so the right thing to do is to grab
 376  * the appropriate SIM lock once the bus/SIM is located.
 377  */
 378 static int
 379 xptioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flag, struct thread *td)
 380 {
 381         int error;
 382
 383         if ((error = xptdoioctl(dev, cmd, addr, flag, td)) == ENOTTY) {
 384                 error = cam_compat_ioctl(dev, cmd, addr, flag, td, xptdoioctl);
 385         }
 386         return (error);
 387 }
 388
 389 static int
 390 xptdoioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flag, struct thread *td)
 391 {
 392         int error;
 393
 394         error = 0;
 395
 396         switch(cmd) {
 397         /*
 398          * For the transport layer CAMIOCOMMAND ioctl, we really only want
 399          * to accept CCB types that don't quite make sense to send through a
 400          * passthrough driver. XPT_PATH_INQ is an exception to this, as stated
 401          * in the CAM spec.
 402          */
 403         case CAMIOCOMMAND: {
 404                 union ccb *ccb;
 405                 union ccb *inccb;
 406                 struct cam_eb *bus;
 407
 408                 inccb = (union ccb *)addr;
 409
 410                 bus = xpt_find_bus(inccb->ccb_h.path_id);
 411                 if (bus == NULL)
 412                         return (EINVAL);
 413
 414                 switch (inccb->ccb_h.func_code) {
 415                 case XPT_SCAN_BUS:
 416                 case XPT_RESET_BUS:
 417                         if (inccb->ccb_h.target_id != CAM_TARGET_WILDCARD ||
 418                             inccb->ccb_h.target_lun != CAM_LUN_WILDCARD) {
 419                                 xpt_release_bus(bus);
 420                                 return (EINVAL);
 421                         }
 422                         break;
 423                 case XPT_SCAN_TGT:
 424                         if (inccb->ccb_h.target_id == CAM_TARGET_WILDCARD ||
 425                             inccb->ccb_h.target_lun != CAM_LUN_WILDCARD) {
 426                                 xpt_release_bus(bus);
 427                                 return (EINVAL);
 428                         }
 429                         break;
 430                 default:
 431                         break;
 432                 }
 433
 434                 switch(inccb->ccb_h.func_code) {
 435                 case XPT_SCAN_BUS:
 436                 case XPT_RESET_BUS:
 437                 case XPT_PATH_INQ:
 438                 case XPT_ENG_INQ:
 439                 case XPT_SCAN_LUN:
 440                 case XPT_SCAN_TGT:
 441
 442                         ccb = xpt_alloc_ccb();
 443
 444                         /*
 445                          * Create a path using the bus, target, and lun the
 446                          * user passed in.
 447                          */
 448                         if (xpt_create_path(&ccb->ccb_h.path, NULL,
 449                                             inccb->ccb_h.path_id,
 450                                             inccb->ccb_h.target_id,
 451                                             inccb->ccb_h.target_lun) !=
 452                                             CAM_REQ_CMP){
 453                                 error = EINVAL;
 454                                 xpt_free_ccb(ccb);
 455                                 break;
 456                         }
 457                         /* Ensure all of our fields are correct */
 458                         xpt_setup_ccb(&ccb->ccb_h, ccb->ccb_h.path,
 459                                       inccb->ccb_h.pinfo.priority);
 460                         xpt_merge_ccb(ccb, inccb);
 461                         xpt_path_lock(ccb->ccb_h.path);
 462                         cam_periph_runccb(ccb, NULL, 0, 0, NULL);
 463                         xpt_path_unlock(ccb->ccb_h.path);
 464                         bcopy(ccb, inccb, sizeof(union ccb));
 465                         xpt_free_path(ccb->ccb_h.path);
 466                         xpt_free_ccb(ccb);
 467                         break;
 468
 469                 case XPT_DEBUG: {
 470                         union ccb ccb;
 471
 472                         /*
 473                          * This is an immediate CCB, so it's okay to
 474                          * allocate it on the stack.
 475                          */
 476
 477                         /*
 478                          * Create a path using the bus, target, and lun the
 479                          * user passed in.
 480                          */
 481                         if (xpt_create_path(&ccb.ccb_h.path, NULL,
 482                                             inccb->ccb_h.path_id,
 483                                             inccb->ccb_h.target_id,
 484                                             inccb->ccb_h.target_lun) !=
 485                                             CAM_REQ_CMP){
 486                                 error = EINVAL;
 487                                 break;
 488                         }
 489                         /* Ensure all of our fields are correct */
 490                         xpt_setup_ccb(&ccb.ccb_h, ccb.ccb_h.path,
 491                                       inccb->ccb_h.pinfo.priority);
 492                         xpt_merge_ccb(&ccb, inccb);
 493                         xpt_action(&ccb);
 494                         bcopy(&ccb, inccb, sizeof(union ccb));
 495                         xpt_free_path(ccb.ccb_h.path);
 496                         break;
 497
 498                 }
 499                 case XPT_DEV_MATCH: {
 500                         struct cam_periph_map_info mapinfo;
 501                         struct cam_path *old_path;
 502
 503                         /*
 504                          * We can't deal with physical addresses for this
 505                          * type of transaction.
 506                          */
 507                         if ((inccb->ccb_h.flags & CAM_DATA_MASK) !=
 508                             CAM_DATA_VADDR) {
 509                                 error = EINVAL;
 510                                 break;
 511                         }
 512
 513                         /*
 514                          * Save this in case the caller had it set to
 515                          * something in particular.
 516                          */
 517                         old_path = inccb->ccb_h.path;
 518
 519                         /*
 520                          * We really don't need a path for the matching
 521                          * code.  The path is needed because of the
 522                          * debugging statements in xpt_action().  They
 523                          * assume that the CCB has a valid path.
 524                          */
 525                         inccb->ccb_h.path = xpt_periph->path;
 526
 527                         bzero(&mapinfo, sizeof(mapinfo));
 528
 529                         /*
 530                          * Map the pattern and match buffers into kernel
 531                          * virtual address space.
 532                          */
 533                         error = cam_periph_mapmem(inccb, &mapinfo);
 534
 535                         if (error) {
 536                                 inccb->ccb_h.path = old_path;
 537                                 break;
 538                         }
 539
 540                         /*
 541                          * This is an immediate CCB, we can send it on directly.
 542                          */
 543                         xpt_action(inccb);
 544
 545                         /*
 546                          * Map the buffers back into user space.
 547                          */
 548                         cam_periph_unmapmem(inccb, &mapinfo);
 549
 550                         inccb->ccb_h.path = old_path;
 551
 552                         error = 0;
 553                         break;
 554                 }
 555                 default:
 556                         error = ENOTSUP;
 557                         break;
 558                 }
 559                 xpt_release_bus(bus);
 560                 break;
 561         }
 562         /*
 563          * This is the getpassthru ioctl. It takes a XPT_GDEVLIST ccb as input,
 564          * with the periphal driver name and unit name filled in.  The other
 565          * fields don't really matter as input.  The passthrough driver name
 566          * ("pass"), and unit number are passed back in the ccb.  The current
 567          * device generation number, and the index into the device peripheral
 568          * driver list, and the status are also passed back.  Note that
 569          * since we do everything in one pass, unlike the XPT_GDEVLIST ccb,
 570          * we never return a status of CAM_GDEVLIST_LIST_CHANGED.  It is
 571          * (or rather should be) impossible for the device peripheral driver
 572          * list to change since we look at the whole thing in one pass, and
 573          * we do it with lock protection.
 574          *
 575          */
 576         case CAMGETPASSTHRU: {
 577                 union ccb *ccb;
 578                 struct cam_periph *periph;
 579                 struct periph_driver **p_drv;
 580                 char   *name;
 581                 u_int unit;
 582                 int base_periph_found;
 583
 584                 ccb = (union ccb *)addr;
 585                 unit = ccb->cgdl.unit_number;
 586                 name = ccb->cgdl.periph_name;
 587                 base_periph_found = 0;
 588
 589                 /*
 590                  * Sanity check -- make sure we don't get a null peripheral
 591                  * driver name.
 592                  */
 593                 if (*ccb->cgdl.periph_name == '\0') {
 594                         error = EINVAL;
 595                         break;
 596                 }
 597
 598                 /* Keep the list from changing while we traverse it */
 599                 xpt_lock_buses();
 600
 601                 /* first find our driver in the list of drivers */
 602                 for (p_drv = periph_drivers; *p_drv != NULL; p_drv++)
 603                         if (strcmp((*p_drv)->driver_name, name) == 0)
 604                                 break;
 605
 606                 if (*p_drv == NULL) {
 607                         xpt_unlock_buses();
 608                         ccb->ccb_h.status = CAM_REQ_CMP_ERR;
 609                         ccb->cgdl.status = CAM_GDEVLIST_ERROR;
 610                         *ccb->cgdl.periph_name = '\0';
 611                         ccb->cgdl.unit_number = 0;
 612                         error = ENOENT;
 613                         break;
 614                 }
 615
 616                 /*
 617                  * Run through every peripheral instance of this driver
 618                  * and check to see whether it matches the unit passed
 619                  * in by the user.  If it does, get out of the loops and
 620                  * find the passthrough driver associated with that
 621                  * peripheral driver.
 622                  */
 623                 for (periph = TAILQ_FIRST(&(*p_drv)->units); periph != NULL;
 624                      periph = TAILQ_NEXT(periph, unit_links)) {
 625
 626                         if (periph->unit_number == unit)
 627                                 break;
 628                 }
 629                 /*
 630                  * If we found the peripheral driver that the user passed
 631                  * in, go through all of the peripheral drivers for that
 632                  * particular device and look for a passthrough driver.
 633                  */
 634                 if (periph != NULL) {
 635                         struct cam_ed *device;
 636                         int i;
 637
 638                         base_periph_found = 1;
 639                         device = periph->path->device;
 640                         for (i = 0, periph = SLIST_FIRST(&device->periphs);
 641                              periph != NULL;
 642                              periph = SLIST_NEXT(periph, periph_links), i++) {
 643                                 /*
 644                                  * Check to see whether we have a
 645                                  * passthrough device or not.
 646                                  */
 647                                 if (strcmp(periph->periph_name, "pass") == 0) {
 648                                         /*
 649                                          * Fill in the getdevlist fields.
 650                                          */
 651                                         strcpy(ccb->cgdl.periph_name,
 652                                                periph->periph_name);
 653                                         ccb->cgdl.unit_number =
 654                                                 periph->unit_number;
 655                                         if (SLIST_NEXT(periph, periph_links))
 656                                                 ccb->cgdl.status =
 657                                                         CAM_GDEVLIST_MORE_DEVS;
 658                                         else
 659                                                 ccb->cgdl.status =
 660                                                        CAM_GDEVLIST_LAST_DEVICE;
 661                                         ccb->cgdl.generation =
 662                                                 device->generation;
 663                                         ccb->cgdl.index = i;
 664                                         /*
 665                                          * Fill in some CCB header fields
 666                                          * that the user may want.
 667                                          */
 668                                         ccb->ccb_h.path_id =
 669                                                 periph->path->bus->path_id;
 670                                         ccb->ccb_h.target_id =
 671                                                 periph->path->target->target_id;
 672                                         ccb->ccb_h.target_lun =
 673                                                 periph->path->device->lun_id;
 674                                         ccb->ccb_h.status = CAM_REQ_CMP;
 675                                         break;
 676                                 }
 677                         }
 678                 }
 679
 680                 /*
 681                  * If the periph is null here, one of two things has
 682                  * happened.  The first possibility is that we couldn't
 683                  * find the unit number of the particular peripheral driver
 684                  * that the user is asking about.  e.g. the user asks for
 685                  * the passthrough driver for "da11".  We find the list of
 686                  * "da" peripherals all right, but there is no unit 11.
 687                  * The other possibility is that we went through the list
 688                  * of peripheral drivers attached to the device structure,
 689                  * but didn't find one with the name "pass".  Either way,
 690                  * we return ENOENT, since we couldn't find something.
 691                  */
 692                 if (periph == NULL) {
 693                         ccb->ccb_h.status = CAM_REQ_CMP_ERR;
 694                         ccb->cgdl.status = CAM_GDEVLIST_ERROR;
 695                         *ccb->cgdl.periph_name = '\0';
 696                         ccb->cgdl.unit_number = 0;
 697                         error = ENOENT;
 698                         /*
 699                          * It is unfortunate that this is even necessary,
 700                          * but there are many, many clueless users out there.
 701                          * If this is true, the user is looking for the
 702                          * passthrough driver, but doesn't have one in his
 703                          * kernel.
 704                          */
 705                         if (base_periph_found == 1) {
 706                                 printf("xptioctl: pass driver is not in the "
 707                                        "kernel\n");
 708                                 printf("xptioctl: put \"device pass\" in "
 709                                        "your kernel config file\n");
 710                         }
 711                 }
 712                 xpt_unlock_buses();
 713                 break;
 714                 }
 715         default:
 716                 error = ENOTTY;
 717                 break;
 718         }
 719
 720         return(error);
 721 }
 722
 723 static int
 724 cam_module_event_handler(module_t mod, int what, void *arg)
 725 {
 726         int error;
 727
 728         switch (what) {
 729         case MOD_LOAD:
 730                 if ((error = xpt_init(NULL)) != 0)
 731                         return (error);
 732                 break;
 733         case MOD_UNLOAD:
 734                 return EBUSY;
 735         default:
 736                 return EOPNOTSUPP;
 737         }
 738
 739         return 0;
 740 }
 741
 742 static void
 743 xpt_rescan_done(struct cam_periph *periph, union ccb *done_ccb)
 744 {
 745
 746         if (done_ccb->ccb_h.ppriv_ptr1 == NULL) {
 747                 xpt_free_path(done_ccb->ccb_h.path);
 748                 xpt_free_ccb(done_ccb);
 749         } else {
 750                 done_ccb->ccb_h.cbfcnp = done_ccb->ccb_h.ppriv_ptr1;
 751                 (*done_ccb->ccb_h.cbfcnp)(periph, done_ccb);
 752         }
 753         xpt_release_boot();
 754 }
 755
 756 /* thread to handle bus rescans */
 757 static void
 758 xpt_scanner_thread(void *dummy)
 759 {
 760         union ccb       *ccb;
 761         struct cam_path  path;
 762
 763         xpt_lock_buses();
 764         for (;;) {
 765                 if (TAILQ_EMPTY(&xsoftc.ccb_scanq))
 766                         msleep(&xsoftc.ccb_scanq, &xsoftc.xpt_topo_lock, PRIBIO,
 767                                "-", 0);
 768                 if ((ccb = (union ccb *)TAILQ_FIRST(&xsoftc.ccb_scanq)) != NULL) {
 769                         TAILQ_REMOVE(&xsoftc.ccb_scanq, &ccb->ccb_h, sim_links.tqe);
 770                         xpt_unlock_buses();
 771
 772                         /*
 773                          * Since lock can be dropped inside and path freed
 774                          * by completion callback even before return here,
 775                          * take our own path copy for reference.
 776                          */
 777                         xpt_copy_path(&path, ccb->ccb_h.path);
 778                         xpt_path_lock(&path);
 779                         xpt_action(ccb);
 780                         xpt_path_unlock(&path);
 781                         xpt_release_path(&path);
 782
 783                         xpt_lock_buses();
 784                 }
 785         }
 786 }
 787
 788 void
 789 xpt_rescan(union ccb *ccb)
 790 {
 791         struct ccb_hdr *hdr;
 792
 793         /* Prepare request */
 794         if (ccb->ccb_h.path->target->target_id == CAM_TARGET_WILDCARD &&
 795             ccb->ccb_h.path->device->lun_id == CAM_LUN_WILDCARD)
 796                 ccb->ccb_h.func_code = XPT_SCAN_BUS;
 797         else if (ccb->ccb_h.path->target->target_id != CAM_TARGET_WILDCARD &&
 798             ccb->ccb_h.path->device->lun_id == CAM_LUN_WILDCARD)
 799                 ccb->ccb_h.func_code = XPT_SCAN_TGT;
 800         else if (ccb->ccb_h.path->target->target_id != CAM_TARGET_WILDCARD &&
 801             ccb->ccb_h.path->device->lun_id != CAM_LUN_WILDCARD)
 802                 ccb->ccb_h.func_code = XPT_SCAN_LUN;
 803         else {
 804                 xpt_print(ccb->ccb_h.path, "illegal scan path\n");
 805                 xpt_free_path(ccb->ccb_h.path);
 806                 xpt_free_ccb(ccb);
 807                 return;
 808         }
 809         ccb->ccb_h.ppriv_ptr1 = ccb->ccb_h.cbfcnp;
 810         ccb->ccb_h.cbfcnp = xpt_rescan_done;
 811         xpt_setup_ccb(&ccb->ccb_h, ccb->ccb_h.path, CAM_PRIORITY_XPT);
 812         /* Don't make duplicate entries for the same paths. */
 813         xpt_lock_buses();
 814         if (ccb->ccb_h.ppriv_ptr1 == NULL) {
 815                 TAILQ_FOREACH(hdr, &xsoftc.ccb_scanq, sim_links.tqe) {
 816                         if (xpt_path_comp(hdr->path, ccb->ccb_h.path) == 0) {
 817                                 wakeup(&xsoftc.ccb_scanq);
 818                                 xpt_unlock_buses();
 819                                 xpt_print(ccb->ccb_h.path, "rescan already queued\n");
 820                                 xpt_free_path(ccb->ccb_h.path);
 821                                 xpt_free_ccb(ccb);
 822                                 return;
 823                         }
 824                 }
 825         }
 826         TAILQ_INSERT_TAIL(&xsoftc.ccb_scanq, &ccb->ccb_h, sim_links.tqe);
 827         xsoftc.buses_to_config++;
 828         wakeup(&xsoftc.ccb_scanq);
 829         xpt_unlock_buses();
 830 }
 831
 832 /* Functions accessed by the peripheral drivers */
 833 static int
 834 xpt_init(void *dummy)
 835 {
 836         struct cam_sim *xpt_sim;
 837         struct cam_path *path;
 838         struct cam_devq *devq;
 839         cam_status status;
 840         int error, i;
 841
 842         TAILQ_INIT(&xsoftc.xpt_busses);
 843         TAILQ_INIT(&xsoftc.ccb_scanq);
 844         STAILQ_INIT(&xsoftc.highpowerq);
 845         xsoftc.num_highpower = CAM_MAX_HIGHPOWER;
 846
 847         mtx_init(&xsoftc.xpt_lock, "XPT lock", NULL, MTX_DEF);
 848         mtx_init(&xsoftc.xpt_highpower_lock, "XPT highpower lock", NULL, MTX_DEF);
 849         mtx_init(&xsoftc.xpt_topo_lock, "XPT topology lock", NULL, MTX_DEF);
 850         xsoftc.xpt_taskq = taskqueue_create("CAM XPT task", M_WAITOK,
 851             taskqueue_thread_enqueue, /*context*/&xsoftc.xpt_taskq);
 852
 853 #ifdef CAM_BOOT_DELAY
 854         /*
 855          * Override this value at compile time to assist our users
 856          * who don't use loader to boot a kernel.
 857          */
 858         xsoftc.boot_delay = CAM_BOOT_DELAY;
 859 #endif
 860         /*
 861          * The xpt layer is, itself, the equivelent of a SIM.
 862          * Allow 16 ccbs in the ccb pool for it.  This should
 863          * give decent parallelism when we probe busses and
 864          * perform other XPT functions.
 865          */
 866         devq = cam_simq_alloc(16);
 867         xpt_sim = cam_sim_alloc(xptaction,
 868                                 xptpoll,
 869                                 "xpt",
 870                                 /*softc*/NULL,
 871                                 /*unit*/0,
 872                                 /*mtx*/&xsoftc.xpt_lock,
 873                                 /*max_dev_transactions*/0,
 874                                 /*max_tagged_dev_transactions*/0,
 875                                 devq);
 876         if (xpt_sim == NULL)
 877                 return (ENOMEM);
 878
 879         mtx_lock(&xsoftc.xpt_lock);
 880         if ((status = xpt_bus_register(xpt_sim, NULL, 0)) != CAM_SUCCESS) {
 881                 mtx_unlock(&xsoftc.xpt_lock);
 882                 printf("xpt_init: xpt_bus_register failed with status %#x,"
 883                        " failing attach\n", status);
 884                 return (EINVAL);
 885         }
 886         mtx_unlock(&xsoftc.xpt_lock);
 887
 888         /*
 889          * Looking at the XPT from the SIM layer, the XPT is
 890          * the equivelent of a peripheral driver.  Allocate
 891          * a peripheral driver entry for us.
 892          */
 893         if ((status = xpt_create_path(&path, NULL, CAM_XPT_PATH_ID,
 894                                       CAM_TARGET_WILDCARD,
 895                                       CAM_LUN_WILDCARD)) != CAM_REQ_CMP) {
 896                 mtx_unlock(&xsoftc.xpt_lock);
 897                 printf("xpt_init: xpt_create_path failed with status %#x,"
 898                        " failing attach\n", status);
 899                 return (EINVAL);
 900         }
 901         xpt_path_lock(path);
 902         cam_periph_alloc(xptregister, NULL, NULL, NULL, "xpt", CAM_PERIPH_BIO,
 903                          path, NULL, 0, xpt_sim);
 904         xpt_path_unlock(path);
 905         xpt_free_path(path);
 906
 907         if (cam_num_doneqs < 1)
 908                 cam_num_doneqs = 1 + mp_ncpus / 6;
 909         else if (cam_num_doneqs > MAXCPU)
 910                 cam_num_doneqs = MAXCPU;
 911         for (i = 0; i < cam_num_doneqs; i++) {
 912                 mtx_init(&cam_doneqs[i].cam_doneq_mtx, "CAM doneq", NULL,
 913                     MTX_DEF);
 914                 STAILQ_INIT(&cam_doneqs[i].cam_doneq);
 915                 error = kproc_kthread_add(xpt_done_td, &cam_doneqs[i],
 916                     &cam_proc, NULL, 0, 0, "cam", "doneq%d", i);
 917                 if (error != 0) {
 918                         cam_num_doneqs = i;
 919                         break;
 920                 }
 921         }
 922         if (cam_num_doneqs < 1) {
 923                 printf("xpt_init: Cannot init completion queues "
 924                        "- failing attach\n");
 925                 return (ENOMEM);
 926         }
 927         /*
 928          * Register a callback for when interrupts are enabled.
 929          */
 930         xsoftc.xpt_config_hook =
 931             (struct intr_config_hook *)malloc(sizeof(struct intr_config_hook),
 932                                               M_CAMXPT, M_NOWAIT | M_ZERO);
 933         if (xsoftc.xpt_config_hook == NULL) {
 934                 printf("xpt_init: Cannot malloc config hook "
 935                        "- failing attach\n");
 936                 return (ENOMEM);
 937         }
 938         xsoftc.xpt_config_hook->ich_func = xpt_config;
 939         if (config_intrhook_establish(xsoftc.xpt_config_hook) != 0) {
 940                 free (xsoftc.xpt_config_hook, M_CAMXPT);
 941                 printf("xpt_init: config_intrhook_establish failed "
 942                        "- failing attach\n");
 943         }
 944
 945         return (0);
 946 }
 947
 948 static cam_status
 949 xptregister(struct cam_periph *periph, void *arg)
 950 {
 951         struct cam_sim *xpt_sim;
 952
 953         if (periph == NULL) {
 954                 printf("xptregister: periph was NULL!!\n");
 955                 return(CAM_REQ_CMP_ERR);
 956         }
 957
 958         xpt_sim = (struct cam_sim *)arg;
 959         xpt_sim->softc = periph;
 960         xpt_periph = periph;
 961         periph->softc = NULL;
 962
 963         return(CAM_REQ_CMP);
 964 }
 965
 966 int32_t
 967 xpt_add_periph(struct cam_periph *periph)
 968 {
 969         struct cam_ed *device;
 970         int32_t  status;
 971
 972         TASK_INIT(&periph->periph_run_task, 0, xpt_run_allocq_task, periph);
 973         device = periph->path->device;
 974         status = CAM_REQ_CMP;
 975         if (device != NULL) {
 976                 mtx_lock(&device->target->bus->eb_mtx);
 977                 device->generation++;
 978                 SLIST_INSERT_HEAD(&device->periphs, periph, periph_links);
 979                 mtx_unlock(&device->target->bus->eb_mtx);
 980         }
 981
 982         return (status);
 983 }
 984
 985 void
 986 xpt_remove_periph(struct cam_periph *periph)
 987 {
 988         struct cam_ed *device;
 989
 990         device = periph->path->device;
 991         if (device != NULL) {
 992                 mtx_lock(&device->target->bus->eb_mtx);
 993                 device->generation++;
 994                 SLIST_REMOVE(&device->periphs, periph, cam_periph, periph_links);
 995                 mtx_unlock(&device->target->bus->eb_mtx);
 996         }
 997 }
 998
 999
1000 void
1001 xpt_announce_periph(struct cam_periph *periph, char *announce_string)
1002 {
1003         struct  cam_path *path = periph->path;
1004
1005         cam_periph_assert(periph, MA_OWNED);
1006         periph->flags |= CAM_PERIPH_ANNOUNCED;
1007
1008         printf("%s%d at %s%d bus %d scbus%d target %d lun %jx\n",
1009                periph->periph_name, periph->unit_number,
1010                path->bus->sim->sim_name,
1011                path->bus->sim->unit_number,
1012                path->bus->sim->bus_id,
1013                path->bus->path_id,
1014                path->target->target_id,
1015                (uintmax_t)path->device->lun_id);
1016         printf("%s%d: ", periph->periph_name, periph->unit_number);
1017         if (path->device->protocol == PROTO_SCSI)
1018                 scsi_print_inquiry(&path->device->inq_data);
1019         else if (path->device->protocol == PROTO_ATA ||
1020             path->device->protocol == PROTO_SATAPM)
1021                 ata_print_ident(&path->device->ident_data);
1022         else if (path->device->protocol == PROTO_SEMB)
1023                 semb_print_ident(
1024                     (struct sep_identify_data *)&path->device->ident_data);
1025         else
1026                 printf("Unknown protocol device\n");
1027         if (path->device->serial_num_len > 0) {
1028                 /* Don't wrap the screen  - print only the first 60 chars */
1029                 printf("%s%d: Serial Number %.60s\n", periph->periph_name,
1030                        periph->unit_number, path->device->serial_num);
1031         }
1032         /* Announce transport details. */
1033         (*(path->bus->xport->announce))(periph);
1034         /* Announce command queueing. */
1035         if (path->device->inq_flags & SID_CmdQue
1036          || path->device->flags & CAM_DEV_TAG_AFTER_COUNT) {
1037                 printf("%s%d: Command Queueing enabled\n",
1038                        periph->periph_name, periph->unit_number);
1039         }
1040         /* Announce caller's details if they've passed in. */
1041         if (announce_string != NULL)
1042                 printf("%s%d: %s\n", periph->periph_name,
1043                        periph->unit_number, announce_string);
1044 }
1045
1046 void
1047 xpt_announce_quirks(struct cam_periph *periph, int quirks, char *bit_string)
1048 {
1049         if (quirks != 0) {
1050                 printf("%s%d: quirks=0x%b\n", periph->periph_name,
1051                     periph->unit_number, quirks, bit_string);
1052         }
1053 }
1054
1055 void
1056 xpt_denounce_periph(struct cam_periph *periph)
1057 {
1058         struct  cam_path *path = periph->path;
1059
1060         cam_periph_assert(periph, MA_OWNED);
1061         printf("%s%d at %s%d bus %d scbus%d target %d lun %jx\n",
1062                periph->periph_name, periph->unit_number,
1063                path->bus->sim->sim_name,
1064                path->bus->sim->unit_number,
1065                path->bus->sim->bus_id,
1066                path->bus->path_id,
1067                path->target->target_id,
1068                (uintmax_t)path->device->lun_id);
1069         printf("%s%d: ", periph->periph_name, periph->unit_number);
1070         if (path->device->protocol == PROTO_SCSI)
1071                 scsi_print_inquiry_short(&path->device->inq_data);
1072         else if (path->device->protocol == PROTO_ATA ||
1073             path->device->protocol == PROTO_SATAPM)
1074                 ata_print_ident_short(&path->device->ident_data);
1075         else if (path->device->protocol == PROTO_SEMB)
1076                 semb_print_ident_short(
1077                     (struct sep_identify_data *)&path->device->ident_data);
1078         else
1079                 printf("Unknown protocol device");
1080         if (path->device->serial_num_len > 0)
1081                 printf(" s/n %.60s", path->device->serial_num);
1082         printf(" detached\n");
1083 }
1084
1085
1086 int
1087 xpt_getattr(char *buf, size_t len, const char *attr, struct cam_path *path)
1088 {
1089         int ret = -1, l;
1090         struct ccb_dev_advinfo cdai;
1091         struct scsi_vpd_id_descriptor *idd;
1092
1093         xpt_path_assert(path, MA_OWNED);
1094
1095         memset(&cdai, 0, sizeof(cdai));
1096         xpt_setup_ccb(&cdai.ccb_h, path, CAM_PRIORITY_NORMAL);
1097         cdai.ccb_h.func_code = XPT_DEV_ADVINFO;
1098         cdai.bufsiz = len;
1099
1100         if (!strcmp(attr, "GEOM::ident"))
1101                 cdai.buftype = CDAI_TYPE_SERIAL_NUM;
1102         else if (!strcmp(attr, "GEOM::physpath"))
1103                 cdai.buftype = CDAI_TYPE_PHYS_PATH;
1104         else if (strcmp(attr, "GEOM::lunid") == 0 ||
1105                  strcmp(attr, "GEOM::lunname") == 0) {
1106                 cdai.buftype = CDAI_TYPE_SCSI_DEVID;
1107                 cdai.bufsiz = CAM_SCSI_DEVID_MAXLEN;
1108         } else
1109                 goto out;
1110
1111         cdai.buf = malloc(cdai.bufsiz, M_CAMXPT, M_NOWAIT|M_ZERO);
1112         if (cdai.buf == NULL) {
1113                 ret = ENOMEM;
1114                 goto out;
1115         }
1116         xpt_action((union ccb *)&cdai); /* can only be synchronous */
1117         if ((cdai.ccb_h.status & CAM_DEV_QFRZN) != 0)
1118                 cam_release_devq(cdai.ccb_h.path, 0, 0, 0, FALSE);
1119         if (cdai.provsiz == 0)
1120                 goto out;
1121         if (cdai.buftype == CDAI_TYPE_SCSI_DEVID) {
1122                 if (strcmp(attr, "GEOM::lunid") == 0) {
1123                         idd = scsi_get_devid((struct scsi_vpd_device_id *)cdai.buf,
1124                             cdai.provsiz, scsi_devid_is_lun_naa);
1125                         if (idd == NULL)
1126                                 idd = scsi_get_devid((struct scsi_vpd_device_id *)cdai.buf,
1127                                     cdai.provsiz, scsi_devid_is_lun_eui64);
1128                 } else
1129                         idd = NULL;
1130                 if (idd == NULL)
1131                         idd = scsi_get_devid((struct scsi_vpd_device_id *)cdai.buf,
1132                             cdai.provsiz, scsi_devid_is_lun_t10);
1133                 if (idd == NULL)
1134                         idd = scsi_get_devid((struct scsi_vpd_device_id *)cdai.buf,
1135                             cdai.provsiz, scsi_devid_is_lun_name);
1136                 if (idd == NULL)
1137                         goto out;
1138                 ret = 0;
1139                 if ((idd->proto_codeset & SVPD_ID_CODESET_MASK) == SVPD_ID_CODESET_ASCII ||
1140                     (idd->proto_codeset & SVPD_ID_CODESET_MASK) == SVPD_ID_CODESET_UTF8) {
1141                         l = strnlen(idd->identifier, idd->length);
1142                         if (l < len) {
1143                                 bcopy(idd->identifier, buf, l);
1144                                 buf[l] = 0;
1145                         } else
1146                                 ret = EFAULT;
1147                 } else {
1148                         if (idd->length * 2 < len) {
1149                                 for (l = 0; l < idd->length; l++)
1150                                         sprintf(buf + l * 2, "%02x",
1151                                             idd->identifier[l]);
1152                         } else
1153                                 ret = EFAULT;
1154                 }
1155         } else {
1156                 ret = 0;
1157                 if (strlcpy(buf, cdai.buf, len) >= len)
1158                         ret = EFAULT;
1159         }
1160
1161 out:
1162         if (cdai.buf != NULL)
1163                 free(cdai.buf, M_CAMXPT);
1164         return ret;
1165 }
1166
1167 static dev_match_ret
1168 xptbusmatch(struct dev_match_pattern *patterns, u_int num_patterns,
1169             struct cam_eb *bus)
1170 {
1171         dev_match_ret retval;
1172         int i;
1173
1174         retval = DM_RET_NONE;
1175
1176         /*
1177          * If we aren't given something to match against, that's an error.
1178          */
1179         if (bus == NULL)
1180                 return(DM_RET_ERROR);
1181
1182         /*
1183          * If there are no match entries, then this bus matches no
1184          * matter what.
1185          */
1186         if ((patterns == NULL) || (num_patterns == 0))
1187                 return(DM_RET_DESCEND | DM_RET_COPY);
1188
1189         for (i = 0; i < num_patterns; i++) {
1190                 struct bus_match_pattern *cur_pattern;
1191
1192                 /*
1193                  * If the pattern in question isn't for a bus node, we
1194                  * aren't interested.  However, we do indicate to the
1195                  * calling routine that we should continue descending the
1196                  * tree, since the user wants to match against lower-level
1197                  * EDT elements.
1198                  */
1199                 if (patterns[i].type != DEV_MATCH_BUS) {
1200                         if ((retval & DM_RET_ACTION_MASK) == DM_RET_NONE)
1201                                 retval |= DM_RET_DESCEND;
1202                         continue;
1203                 }
1204
1205                 cur_pattern = &patterns[i].pattern.bus_pattern;
1206
1207                 /*
1208                  * If they want to match any bus node, we give them any
1209                  * device node.
1210                  */
1211                 if (cur_pattern->flags == BUS_MATCH_ANY) {
1212                         /* set the copy flag */
1213                         retval |= DM_RET_COPY;
1214
1215                         /*
1216                          * If we've already decided on an action, go ahead
1217                          * and return.
1218                          */
1219                         if ((retval & DM_RET_ACTION_MASK) != DM_RET_NONE)
1220                                 return(retval);
1221                 }
1222
1223                 /*
1224                  * Not sure why someone would do this...
1225                  */
1226                 if (cur_pattern->flags == BUS_MATCH_NONE)
1227                         continue;
1228
1229                 if (((cur_pattern->flags & BUS_MATCH_PATH) != 0)
1230                  && (cur_pattern->path_id != bus->path_id))
1231                         continue;
1232
1233                 if (((cur_pattern->flags & BUS_MATCH_BUS_ID) != 0)
1234                  && (cur_pattern->bus_id != bus->sim->bus_id))
1235                         continue;
1236
1237                 if (((cur_pattern->flags & BUS_MATCH_UNIT) != 0)
1238                  && (cur_pattern->unit_number != bus->sim->unit_number))
1239                         continue;
1240
1241                 if (((cur_pattern->flags & BUS_MATCH_NAME) != 0)
1242                  && (strncmp(cur_pattern->dev_name, bus->sim->sim_name,
1243                              DEV_IDLEN) != 0))
1244                         continue;
1245
1246                 /*
1247                  * If we get to this point, the user definitely wants
1248                  * information on this bus.  So tell the caller to copy the
1249                  * data out.
1250                  */
1251                 retval |= DM_RET_COPY;
1252
1253                 /*
1254                  * If the return action has been set to descend, then we
1255                  * know that we've already seen a non-bus matching
1256                  * expression, therefore we need to further descend the tree.
1257                  * This won't change by continuing around the loop, so we
1258                  * go ahead and return.  If we haven't seen a non-bus
1259                  * matching expression, we keep going around the loop until
1260                  * we exhaust the matching expressions.  We'll set the stop
1261                  * flag once we fall out of the loop.
1262                  */
1263                 if ((retval & DM_RET_ACTION_MASK) == DM_RET_DESCEND)
1264                         return(retval);
1265         }
1266
1267         /*
1268          * If the return action hasn't been set to descend yet, that means
1269          * we haven't seen anything other than bus matching patterns.  So
1270          * tell the caller to stop descending the tree -- the user doesn't
1271          * want to match against lower level tree elements.
1272          */
1273         if ((retval & DM_RET_ACTION_MASK) == DM_RET_NONE)
1274                 retval |= DM_RET_STOP;
1275
1276         return(retval);
1277 }
1278
1279 static dev_match_ret
1280 xptdevicematch(struct dev_match_pattern *patterns, u_int num_patterns,
1281                struct cam_ed *device)
1282 {
1283         dev_match_ret retval;
1284         int i;
1285
1286         retval = DM_RET_NONE;
1287
1288         /*
1289          * If we aren't given something to match against, that's an error.
1290          */
1291         if (device == NULL)
1292                 return(DM_RET_ERROR);
1293
1294         /*
1295          * If there are no match entries, then this device matches no
1296          * matter what.
1297          */
1298         if ((patterns == NULL) || (num_patterns == 0))
1299                 return(DM_RET_DESCEND | DM_RET_COPY);
1300
1301         for (i = 0; i < num_patterns; i++) {
1302                 struct device_match_pattern *cur_pattern;
1303                 struct scsi_vpd_device_id *device_id_page;
1304
1305                 /*
1306                  * If the pattern in question isn't for a device node, we
1307                  * aren't interested.
1308                  */
1309                 if (patterns[i].type != DEV_MATCH_DEVICE) {
1310                         if ((patterns[i].type == DEV_MATCH_PERIPH)
1311                          && ((retval & DM_RET_ACTION_MASK) == DM_RET_NONE))
1312                                 retval |= DM_RET_DESCEND;
1313                         continue;
1314                 }
1315
1316                 cur_pattern = &patterns[i].pattern.device_pattern;
1317
1318                 /* Error out if mutually exclusive options are specified. */
1319                 if ((cur_pattern->flags & (DEV_MATCH_INQUIRY|DEV_MATCH_DEVID))
1320                  == (DEV_MATCH_INQUIRY|DEV_MATCH_DEVID))
1321                         return(DM_RET_ERROR);
1322
1323                 /*
1324                  * If they want to match any device node, we give them any
1325                  * device node.
1326                  */
1327                 if (cur_pattern->flags == DEV_MATCH_ANY)
1328                         goto copy_dev_node;
1329
1330                 /*
1331                  * Not sure why someone would do this...
1332                  */
1333                 if (cur_pattern->flags == DEV_MATCH_NONE)
1334                         continue;
1335
1336                 if (((cur_pattern->flags & DEV_MATCH_PATH) != 0)
1337                  && (cur_pattern->path_id != device->target->bus->path_id))
1338                         continue;
1339
1340                 if (((cur_pattern->flags & DEV_MATCH_TARGET) != 0)
1341                  && (cur_pattern->target_id != device->target->target_id))
1342                         continue;
1343
1344                 if (((cur_pattern->flags & DEV_MATCH_LUN) != 0)
1345                  && (cur_pattern->target_lun != device->lun_id))
1346                         continue;
1347
1348                 if (((cur_pattern->flags & DEV_MATCH_INQUIRY) != 0)
1349                  && (cam_quirkmatch((caddr_t)&device->inq_data,
1350                                     (caddr_t)&cur_pattern->data.inq_pat,
1351                                     1, sizeof(cur_pattern->data.inq_pat),
1352                                     scsi_static_inquiry_match) == NULL))
1353                         continue;
1354
1355                 device_id_page = (struct scsi_vpd_device_id *)device->device_id;
1356                 if (((cur_pattern->flags & DEV_MATCH_DEVID) != 0)
1357                  && (device->device_id_len < SVPD_DEVICE_ID_HDR_LEN
1358                   || scsi_devid_match((uint8_t *)device_id_page->desc_list,
1359                                       device->device_id_len
1360                                     - SVPD_DEVICE_ID_HDR_LEN,
1361                                       cur_pattern->data.devid_pat.id,
1362                                       cur_pattern->data.devid_pat.id_len) != 0))
1363                         continue;
1364
1365 copy_dev_node:
1366                 /*
1367                  * If we get to this point, the user definitely wants
1368                  * information on this device.  So tell the caller to copy
1369                  * the data out.
1370                  */
1371                 retval |= DM_RET_COPY;
1372
1373                 /*
1374                  * If the return action has been set to descend, then we
1375                  * know that we've already seen a peripheral matching
1376                  * expression, therefore we need to further descend the tree.
1377                  * This won't change by continuing around the loop, so we
1378                  * go ahead and return.  If we haven't seen a peripheral
1379                  * matching expression, we keep going around the loop until
1380                  * we exhaust the matching expressions.  We'll set the stop
1381                  * flag once we fall out of the loop.
1382                  */
1383                 if ((retval & DM_RET_ACTION_MASK) == DM_RET_DESCEND)
1384                         return(retval);
1385         }
1386
1387         /*
1388          * If the return action hasn't been set to descend yet, that means
1389          * we haven't seen any peripheral matching patterns.  So tell the
1390          * caller to stop descending the tree -- the user doesn't want to
1391          * match against lower level tree elements.
1392          */
1393         if ((retval & DM_RET_ACTION_MASK) == DM_RET_NONE)
1394                 retval |= DM_RET_STOP;
1395
1396         return(retval);
1397 }
1398
1399 /*
1400  * Match a single peripheral against any number of match patterns.
1401  */
1402 static dev_match_ret
1403 xptperiphmatch(struct dev_match_pattern *patterns, u_int num_patterns,
1404                struct cam_periph *periph)
1405 {
1406         dev_match_ret retval;
1407         int i;
1408
1409         /*
1410          * If we aren't given something to match against, that's an error.
1411          */
1412         if (periph == NULL)
1413                 return(DM_RET_ERROR);
1414
1415         /*
1416          * If there are no match entries, then this peripheral matches no
1417          * matter what.
1418          */
1419         if ((patterns == NULL) || (num_patterns == 0))
1420                 return(DM_RET_STOP | DM_RET_COPY);
1421
1422         /*
1423          * There aren't any nodes below a peripheral node, so there's no
1424          * reason to descend the tree any further.
1425          */
1426         retval = DM_RET_STOP;
1427
1428         for (i = 0; i < num_patterns; i++) {
1429                 struct periph_match_pattern *cur_pattern;
1430
1431                 /*
1432                  * If the pattern in question isn't for a peripheral, we
1433                  * aren't interested.
1434                  */
1435                 if (patterns[i].type != DEV_MATCH_PERIPH)
1436                         continue;
1437
1438                 cur_pattern = &patterns[i].pattern.periph_pattern;
1439
1440                 /*
1441                  * If they want to match on anything, then we will do so.
1442                  */
1443                 if (cur_pattern->flags == PERIPH_MATCH_ANY) {
1444                         /* set the copy flag */
1445                         retval |= DM_RET_COPY;
1446
1447                         /*
1448                          * We've already set the return action to stop,
1449                          * since there are no nodes below peripherals in
1450                          * the tree.
1451                          */
1452                         return(retval);
1453                 }
1454
1455                 /*
1456                  * Not sure why someone would do this...
1457                  */
1458                 if (cur_pattern->flags == PERIPH_MATCH_NONE)
1459                         continue;
1460
1461                 if (((cur_pattern->flags & PERIPH_MATCH_PATH) != 0)
1462                  && (cur_pattern->path_id != periph->path->bus->path_id))
1463                         continue;
1464
1465                 /*
1466                  * For the target and lun id's, we have to make sure the
1467                  * target and lun pointers aren't NULL.  The xpt peripheral
1468                  * has a wildcard target and device.
1469                  */
1470                 if (((cur_pattern->flags & PERIPH_MATCH_TARGET) != 0)
1471                  && ((periph->path->target == NULL)
1472                  ||(cur_pattern->target_id != periph->path->target->target_id)))
1473                         continue;
1474
1475                 if (((cur_pattern->flags & PERIPH_MATCH_LUN) != 0)
1476                  && ((periph->path->device == NULL)
1477                  || (cur_pattern->target_lun != periph->path->device->lun_id)))
1478                         continue;
1479
1480                 if (((cur_pattern->flags & PERIPH_MATCH_UNIT) != 0)
1481                  && (cur_pattern->unit_number != periph->unit_number))
1482                         continue;
1483
1484                 if (((cur_pattern->flags & PERIPH_MATCH_NAME) != 0)
1485                  && (strncmp(cur_pattern->periph_name, periph->periph_name,
1486                              DEV_IDLEN) != 0))
1487                         continue;
1488
1489                 /*
1490                  * If we get to this point, the user definitely wants
1491                  * information on this peripheral.  So tell the caller to
1492                  * copy the data out.
1493                  */
1494                 retval |= DM_RET_COPY;
1495
1496                 /*
1497                  * The return action has already been set to stop, since
1498                  * peripherals don't have any nodes below them in the EDT.
1499                  */
1500                 return(retval);
1501         }
1502
1503         /*
1504          * If we get to this point, the peripheral that was passed in
1505          * doesn't match any of the patterns.
1506          */
1507         return(retval);
1508 }
1509
1510 static int
1511 xptedtbusfunc(struct cam_eb *bus, void *arg)
1512 {
1513         struct ccb_dev_match *cdm;
1514         struct cam_et *target;
1515         dev_match_ret retval;
1516
1517         cdm = (struct ccb_dev_match *)arg;
1518
1519         /*
1520          * If our position is for something deeper in the tree, that means
1521          * that we've already seen this node.  So, we keep going down.
1522          */
1523         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
1524          && (cdm->pos.cookie.bus == bus)
1525          && (cdm->pos.position_type & CAM_DEV_POS_TARGET)
1526          && (cdm->pos.cookie.target != NULL))
1527                 retval = DM_RET_DESCEND;
1528         else
1529                 retval = xptbusmatch(cdm->patterns, cdm->num_patterns, bus);
1530
1531         /*
1532          * If we got an error, bail out of the search.
1533          */
1534         if ((retval & DM_RET_ACTION_MASK) == DM_RET_ERROR) {
1535                 cdm->status = CAM_DEV_MATCH_ERROR;
1536                 return(0);
1537         }
1538
1539         /*
1540          * If the copy flag is set, copy this bus out.
1541          */
1542         if (retval & DM_RET_COPY) {
1543                 int spaceleft, j;
1544
1545                 spaceleft = cdm->match_buf_len - (cdm->num_matches *
1546                         sizeof(struct dev_match_result));
1547
1548                 /*
1549                  * If we don't have enough space to put in another
1550                  * match result, save our position and tell the
1551                  * user there are more devices to check.
1552                  */
1553                 if (spaceleft < sizeof(struct dev_match_result)) {
1554                         bzero(&cdm->pos, sizeof(cdm->pos));
1555                         cdm->pos.position_type =
1556                                 CAM_DEV_POS_EDT | CAM_DEV_POS_BUS;
1557
1558                         cdm->pos.cookie.bus = bus;
1559                         cdm->pos.generations[CAM_BUS_GENERATION]=
1560                                 xsoftc.bus_generation;
1561                         cdm->status = CAM_DEV_MATCH_MORE;
1562                         return(0);
1563                 }
1564                 j = cdm->num_matches;
1565                 cdm->num_matches++;
1566                 cdm->matches[j].type = DEV_MATCH_BUS;
1567                 cdm->matches[j].result.bus_result.path_id = bus->path_id;
1568                 cdm->matches[j].result.bus_result.bus_id = bus->sim->bus_id;
1569                 cdm->matches[j].result.bus_result.unit_number =
1570                         bus->sim->unit_number;
1571                 strncpy(cdm->matches[j].result.bus_result.dev_name,
1572                         bus->sim->sim_name, DEV_IDLEN);
1573         }
1574
1575         /*
1576          * If the user is only interested in busses, there's no
1577          * reason to descend to the next level in the tree.
1578          */
1579         if ((retval & DM_RET_ACTION_MASK) == DM_RET_STOP)
1580                 return(1);
1581
1582         /*
1583          * If there is a target generation recorded, check it to
1584          * make sure the target list hasn't changed.
1585          */
1586         mtx_lock(&bus->eb_mtx);
1587         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
1588          && (cdm->pos.cookie.bus == bus)
1589          && (cdm->pos.position_type & CAM_DEV_POS_TARGET)
1590          && (cdm->pos.cookie.target != NULL)) {
1591                 if ((cdm->pos.generations[CAM_TARGET_GENERATION] !=
1592                     bus->generation)) {
1593                         mtx_unlock(&bus->eb_mtx);
1594                         cdm->status = CAM_DEV_MATCH_LIST_CHANGED;
1595                         return (0);
1596                 }
1597                 target = (struct cam_et *)cdm->pos.cookie.target;
1598                 target->refcount++;
1599         } else
1600                 target = NULL;
1601         mtx_unlock(&bus->eb_mtx);
1602
1603         return (xpttargettraverse(bus, target, xptedttargetfunc, arg));
1604 }
1605
1606 static int
1607 xptedttargetfunc(struct cam_et *target, void *arg)
1608 {
1609         struct ccb_dev_match *cdm;
1610         struct cam_eb *bus;
1611         struct cam_ed *device;
1612
1613         cdm = (struct ccb_dev_match *)arg;
1614         bus = target->bus;
1615
1616         /*
1617          * If there is a device list generation recorded, check it to
1618          * make sure the device list hasn't changed.
1619          */
1620         mtx_lock(&bus->eb_mtx);
1621         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
1622          && (cdm->pos.cookie.bus == bus)
1623          && (cdm->pos.position_type & CAM_DEV_POS_TARGET)
1624          && (cdm->pos.cookie.target == target)
1625          && (cdm->pos.position_type & CAM_DEV_POS_DEVICE)
1626          && (cdm->pos.cookie.device != NULL)) {
1627                 if (cdm->pos.generations[CAM_DEV_GENERATION] !=
1628                     target->generation) {
1629                         mtx_unlock(&bus->eb_mtx);
1630                         cdm->status = CAM_DEV_MATCH_LIST_CHANGED;
1631                         return(0);
1632                 }
1633                 device = (struct cam_ed *)cdm->pos.cookie.device;
1634                 device->refcount++;
1635         } else
1636                 device = NULL;
1637         mtx_unlock(&bus->eb_mtx);
1638
1639         return (xptdevicetraverse(target, device, xptedtdevicefunc, arg));
1640 }
1641
1642 static int
1643 xptedtdevicefunc(struct cam_ed *device, void *arg)
1644 {
1645         struct cam_eb *bus;
1646         struct cam_periph *periph;
1647         struct ccb_dev_match *cdm;
1648         dev_match_ret retval;
1649
1650         cdm = (struct ccb_dev_match *)arg;
1651         bus = device->target->bus;
1652
1653         /*
1654          * If our position is for something deeper in the tree, that means
1655          * that we've already seen this node.  So, we keep going down.
1656          */
1657         if ((cdm->pos.position_type & CAM_DEV_POS_DEVICE)
1658          && (cdm->pos.cookie.device == device)
1659          && (cdm->pos.position_type & CAM_DEV_POS_PERIPH)
1660          && (cdm->pos.cookie.periph != NULL))
1661                 retval = DM_RET_DESCEND;
1662         else
1663                 retval = xptdevicematch(cdm->patterns, cdm->num_patterns,
1664                                         device);
1665
1666         if ((retval & DM_RET_ACTION_MASK) == DM_RET_ERROR) {
1667                 cdm->status = CAM_DEV_MATCH_ERROR;
1668                 return(0);
1669         }
1670
1671         /*
1672          * If the copy flag is set, copy this device out.
1673          */
1674         if (retval & DM_RET_COPY) {
1675                 int spaceleft, j;
1676
1677                 spaceleft = cdm->match_buf_len - (cdm->num_matches *
1678                         sizeof(struct dev_match_result));
1679
1680                 /*
1681                  * If we don't have enough space to put in another
1682                  * match result, save our position and tell the
1683                  * user there are more devices to check.
1684                  */
1685                 if (spaceleft < sizeof(struct dev_match_result)) {
1686                         bzero(&cdm->pos, sizeof(cdm->pos));
1687                         cdm->pos.position_type =
1688                                 CAM_DEV_POS_EDT | CAM_DEV_POS_BUS |
1689                                 CAM_DEV_POS_TARGET | CAM_DEV_POS_DEVICE;
1690
1691                         cdm->pos.cookie.bus = device->target->bus;
1692                         cdm->pos.generations[CAM_BUS_GENERATION]=
1693                                 xsoftc.bus_generation;
1694                         cdm->pos.cookie.target = device->target;
1695                         cdm->pos.generations[CAM_TARGET_GENERATION] =
1696                                 device->target->bus->generation;
1697                         cdm->pos.cookie.device = device;
1698                         cdm->pos.generations[CAM_DEV_GENERATION] =
1699                                 device->target->generation;
1700                         cdm->status = CAM_DEV_MATCH_MORE;
1701                         return(0);
1702                 }
1703                 j = cdm->num_matches;
1704                 cdm->num_matches++;
1705                 cdm->matches[j].type = DEV_MATCH_DEVICE;
1706                 cdm->matches[j].result.device_result.path_id =
1707                         device->target->bus->path_id;
1708                 cdm->matches[j].result.device_result.target_id =
1709                         device->target->target_id;
1710                 cdm->matches[j].result.device_result.target_lun =
1711                         device->lun_id;
1712                 cdm->matches[j].result.device_result.protocol =
1713                         device->protocol;
1714                 bcopy(&device->inq_data,
1715                       &cdm->matches[j].result.device_result.inq_data,
1716                       sizeof(struct scsi_inquiry_data));
1717                 bcopy(&device->ident_data,
1718                       &cdm->matches[j].result.device_result.ident_data,
1719                       sizeof(struct ata_params));
1720
1721                 /* Let the user know whether this device is unconfigured */
1722                 if (device->flags & CAM_DEV_UNCONFIGURED)
1723                         cdm->matches[j].result.device_result.flags =
1724                                 DEV_RESULT_UNCONFIGURED;
1725                 else
1726                         cdm->matches[j].result.device_result.flags =
1727                                 DEV_RESULT_NOFLAG;
1728         }
1729
1730         /*
1731          * If the user isn't interested in peripherals, don't descend
1732          * the tree any further.
1733          */
1734         if ((retval & DM_RET_ACTION_MASK) == DM_RET_STOP)
1735                 return(1);
1736
1737         /*
1738          * If there is a peripheral list generation recorded, make sure
1739          * it hasn't changed.
1740          */
1741         xpt_lock_buses();
1742         mtx_lock(&bus->eb_mtx);
1743         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
1744          && (cdm->pos.cookie.bus == bus)
1745          && (cdm->pos.position_type & CAM_DEV_POS_TARGET)
1746          && (cdm->pos.cookie.target == device->target)
1747          && (cdm->pos.position_type & CAM_DEV_POS_DEVICE)
1748          && (cdm->pos.cookie.device == device)
1749          && (cdm->pos.position_type & CAM_DEV_POS_PERIPH)
1750          && (cdm->pos.cookie.periph != NULL)) {
1751                 if (cdm->pos.generations[CAM_PERIPH_GENERATION] !=
1752                     device->generation) {
1753                         mtx_unlock(&bus->eb_mtx);
1754                         xpt_unlock_buses();
1755                         cdm->status = CAM_DEV_MATCH_LIST_CHANGED;
1756                         return(0);
1757                 }
1758                 periph = (struct cam_periph *)cdm->pos.cookie.periph;
1759                 periph->refcount++;
1760         } else
1761                 periph = NULL;
1762         mtx_unlock(&bus->eb_mtx);
1763         xpt_unlock_buses();
1764
1765         return (xptperiphtraverse(device, periph, xptedtperiphfunc, arg));
1766 }
1767
1768 static int
1769 xptedtperiphfunc(struct cam_periph *periph, void *arg)
1770 {
1771         struct ccb_dev_match *cdm;
1772         dev_match_ret retval;
1773
1774         cdm = (struct ccb_dev_match *)arg;
1775
1776         retval = xptperiphmatch(cdm->patterns, cdm->num_patterns, periph);
1777
1778         if ((retval & DM_RET_ACTION_MASK) == DM_RET_ERROR) {
1779                 cdm->status = CAM_DEV_MATCH_ERROR;
1780                 return(0);
1781         }
1782
1783         /*
1784          * If the copy flag is set, copy this peripheral out.
1785          */
1786         if (retval & DM_RET_COPY) {
1787                 int spaceleft, j;
1788
1789                 spaceleft = cdm->match_buf_len - (cdm->num_matches *
1790                         sizeof(struct dev_match_result));
1791
1792                 /*
1793                  * If we don't have enough space to put in another
1794                  * match result, save our position and tell the
1795                  * user there are more devices to check.
1796                  */
1797                 if (spaceleft < sizeof(struct dev_match_result)) {
1798                         bzero(&cdm->pos, sizeof(cdm->pos));
1799                         cdm->pos.position_type =
1800                                 CAM_DEV_POS_EDT | CAM_DEV_POS_BUS |
1801                                 CAM_DEV_POS_TARGET | CAM_DEV_POS_DEVICE |
1802                                 CAM_DEV_POS_PERIPH;
1803
1804                         cdm->pos.cookie.bus = periph->path->bus;
1805                         cdm->pos.generations[CAM_BUS_GENERATION]=
1806                                 xsoftc.bus_generation;
1807                         cdm->pos.cookie.target = periph->path->target;
1808                         cdm->pos.generations[CAM_TARGET_GENERATION] =
1809                                 periph->path->bus->generation;
1810                         cdm->pos.cookie.device = periph->path->device;
1811                         cdm->pos.generations[CAM_DEV_GENERATION] =
1812                                 periph->path->target->generation;
1813                         cdm->pos.cookie.periph = periph;
1814                         cdm->pos.generations[CAM_PERIPH_GENERATION] =
1815                                 periph->path->device->generation;
1816                         cdm->status = CAM_DEV_MATCH_MORE;
1817                         return(0);
1818                 }
1819
1820                 j = cdm->num_matches;
1821                 cdm->num_matches++;
1822                 cdm->matches[j].type = DEV_MATCH_PERIPH;
1823                 cdm->matches[j].result.periph_result.path_id =
1824                         periph->path->bus->path_id;
1825                 cdm->matches[j].result.periph_result.target_id =
1826                         periph->path->target->target_id;
1827                 cdm->matches[j].result.periph_result.target_lun =
1828                         periph->path->device->lun_id;
1829                 cdm->matches[j].result.periph_result.unit_number =
1830                         periph->unit_number;
1831                 strncpy(cdm->matches[j].result.periph_result.periph_name,
1832                         periph->periph_name, DEV_IDLEN);
1833         }
1834
1835         return(1);
1836 }
1837
1838 static int
1839 xptedtmatch(struct ccb_dev_match *cdm)
1840 {
1841         struct cam_eb *bus;
1842         int ret;
1843
1844         cdm->num_matches = 0;
1845
1846         /*
1847          * Check the bus list generation.  If it has changed, the user
1848          * needs to reset everything and start over.
1849          */
1850         xpt_lock_buses();
1851         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
1852          && (cdm->pos.cookie.bus != NULL)) {
1853                 if (cdm->pos.generations[CAM_BUS_GENERATION] !=
1854                     xsoftc.bus_generation) {
1855                         xpt_unlock_buses();
1856                         cdm->status = CAM_DEV_MATCH_LIST_CHANGED;
1857                         return(0);
1858                 }
1859                 bus = (struct cam_eb *)cdm->pos.cookie.bus;
1860                 bus->refcount++;
1861         } else
1862                 bus = NULL;
1863         xpt_unlock_buses();
1864
1865         ret = xptbustraverse(bus, xptedtbusfunc, cdm);
1866
1867         /*
1868          * If we get back 0, that means that we had to stop before fully
1869          * traversing the EDT.  It also means that one of the subroutines
1870          * has set the status field to the proper value.  If we get back 1,
1871          * we've fully traversed the EDT and copied out any matching entries.
1872          */
1873         if (ret == 1)
1874                 cdm->status = CAM_DEV_MATCH_LAST;
1875
1876         return(ret);
1877 }
1878
1879 static int
1880 xptplistpdrvfunc(struct periph_driver **pdrv, void *arg)
1881 {
1882         struct cam_periph *periph;
1883         struct ccb_dev_match *cdm;
1884
1885         cdm = (struct ccb_dev_match *)arg;
1886
1887         xpt_lock_buses();
1888         if ((cdm->pos.position_type & CAM_DEV_POS_PDPTR)
1889          && (cdm->pos.cookie.pdrv == pdrv)
1890          && (cdm->pos.position_type & CAM_DEV_POS_PERIPH)
1891          && (cdm->pos.cookie.periph != NULL)) {
1892                 if (cdm->pos.generations[CAM_PERIPH_GENERATION] !=
1893                     (*pdrv)->generation) {
1894                         xpt_unlock_buses();
1895                         cdm->status = CAM_DEV_MATCH_LIST_CHANGED;
1896                         return(0);
1897                 }
1898                 periph = (struct cam_periph *)cdm->pos.cookie.periph;
1899                 periph->refcount++;
1900         } else
1901                 periph = NULL;
1902         xpt_unlock_buses();
1903
1904         return (xptpdperiphtraverse(pdrv, periph, xptplistperiphfunc, arg));
1905 }
1906
1907 static int
1908 xptplistperiphfunc(struct cam_periph *periph, void *arg)
1909 {
1910         struct ccb_dev_match *cdm;
1911         dev_match_ret retval;
1912
1913         cdm = (struct ccb_dev_match *)arg;
1914
1915         retval = xptperiphmatch(cdm->patterns, cdm->num_patterns, periph);
1916
1917         if ((retval & DM_RET_ACTION_MASK) == DM_RET_ERROR) {
1918                 cdm->status = CAM_DEV_MATCH_ERROR;
1919                 return(0);
1920         }
1921
1922         /*
1923          * If the copy flag is set, copy this peripheral out.
1924          */
1925         if (retval & DM_RET_COPY) {
1926                 int spaceleft, j;
1927
1928                 spaceleft = cdm->match_buf_len - (cdm->num_matches *
1929                         sizeof(struct dev_match_result));
1930
1931                 /*
1932                  * If we don't have enough space to put in another
1933                  * match result, save our position and tell the
1934                  * user there are more devices to check.
1935                  */
1936                 if (spaceleft < sizeof(struct dev_match_result)) {
1937                         struct periph_driver **pdrv;
1938
1939                         pdrv = NULL;
1940                         bzero(&cdm->pos, sizeof(cdm->pos));
1941                         cdm->pos.position_type =
1942                                 CAM_DEV_POS_PDRV | CAM_DEV_POS_PDPTR |
1943                                 CAM_DEV_POS_PERIPH;
1944
1945                         /*
1946                          * This may look a bit non-sensical, but it is
1947                          * actually quite logical.  There are very few
1948                          * peripheral drivers, and bloating every peripheral
1949                          * structure with a pointer back to its parent
1950                          * peripheral driver linker set entry would cost
1951                          * more in the long run than doing this quick lookup.
1952                          */
1953                         for (pdrv = periph_drivers; *pdrv != NULL; pdrv++) {
1954                                 if (strcmp((*pdrv)->driver_name,
1955                                     periph->periph_name) == 0)
1956                                         break;
1957                         }
1958
1959                         if (*pdrv == NULL) {
1960                                 cdm->status = CAM_DEV_MATCH_ERROR;
1961                                 return(0);
1962                         }
1963
1964                         cdm->pos.cookie.pdrv = pdrv;
1965                         /*
1966                          * The periph generation slot does double duty, as
1967                          * does the periph pointer slot.  They are used for
1968                          * both edt and pdrv lookups and positioning.
1969                          */
1970                         cdm->pos.cookie.periph = periph;
1971                         cdm->pos.generations[CAM_PERIPH_GENERATION] =
1972                                 (*pdrv)->generation;
1973                         cdm->status = CAM_DEV_MATCH_MORE;
1974                         return(0);
1975                 }
1976
1977                 j = cdm->num_matches;
1978                 cdm->num_matches++;
1979                 cdm->matches[j].type = DEV_MATCH_PERIPH;
1980                 cdm->matches[j].result.periph_result.path_id =
1981                         periph->path->bus->path_id;
1982
1983                 /*
1984                  * The transport layer peripheral doesn't have a target or
1985                  * lun.
1986                  */
1987                 if (periph->path->target)
1988                         cdm->matches[j].result.periph_result.target_id =
1989                                 periph->path->target->target_id;
1990                 else
1991                         cdm->matches[j].result.periph_result.target_id =
1992                                 CAM_TARGET_WILDCARD;
1993
1994                 if (periph->path->device)
1995                         cdm->matches[j].result.periph_result.target_lun =
1996                                 periph->path->device->lun_id;
1997                 else
1998                         cdm->matches[j].result.periph_result.target_lun =
1999                                 CAM_LUN_WILDCARD;
2000
2001                 cdm->matches[j].result.periph_result.unit_number =
2002                         periph->unit_number;
2003                 strncpy(cdm->matches[j].result.periph_result.periph_name,
2004                         periph->periph_name, DEV_IDLEN);
2005         }
2006
2007         return(1);
2008 }
2009
2010 static int
2011 xptperiphlistmatch(struct ccb_dev_match *cdm)
2012 {
2013         int ret;
2014
2015         cdm->num_matches = 0;
2016
2017         /*
2018          * At this point in the edt traversal function, we check the bus
2019          * list generation to make sure that no busses have been added or
2020          * removed since the user last sent a XPT_DEV_MATCH ccb through.
2021          * For the peripheral driver list traversal function, however, we
2022          * don't have to worry about new peripheral driver types coming or
2023          * going; they're in a linker set, and therefore can't change
2024          * without a recompile.
2025          */
2026
2027         if ((cdm->pos.position_type & CAM_DEV_POS_PDPTR)
2028          && (cdm->pos.cookie.pdrv != NULL))
2029                 ret = xptpdrvtraverse(
2030                                 (struct periph_driver **)cdm->pos.cookie.pdrv,
2031                                 xptplistpdrvfunc, cdm);
2032         else
2033                 ret = xptpdrvtraverse(NULL, xptplistpdrvfunc, cdm);
2034
2035         /*
2036          * If we get back 0, that means that we had to stop before fully
2037          * traversing the peripheral driver tree.  It also means that one of
2038          * the subroutines has set the status field to the proper value.  If
2039          * we get back 1, we've fully traversed the EDT and copied out any
2040          * matching entries.
2041          */
2042         if (ret == 1)
2043                 cdm->status = CAM_DEV_MATCH_LAST;
2044
2045         return(ret);
2046 }
2047
2048 static int
2049 xptbustraverse(struct cam_eb *start_bus, xpt_busfunc_t *tr_func, void *arg)
2050 {
2051         struct cam_eb *bus, *next_bus;
2052         int retval;
2053
2054         retval = 1;
2055         if (start_bus)
2056                 bus = start_bus;
2057         else {
2058                 xpt_lock_buses();
2059                 bus = TAILQ_FIRST(&xsoftc.xpt_busses);
2060                 if (bus == NULL) {
2061                         xpt_unlock_buses();
2062                         return (retval);
2063                 }
2064                 bus->refcount++;
2065                 xpt_unlock_buses();
2066         }
2067         for (; bus != NULL; bus = next_bus) {
2068                 retval = tr_func(bus, arg);
2069                 if (retval == 0) {
2070                         xpt_release_bus(bus);
2071                         break;
2072                 }
2073                 xpt_lock_buses();
2074                 next_bus = TAILQ_NEXT(bus, links);
2075                 if (next_bus)
2076                         next_bus->refcount++;
2077                 xpt_unlock_buses();
2078                 xpt_release_bus(bus);
2079         }
2080         return(retval);
2081 }
2082
2083 static int
2084 xpttargettraverse(struct cam_eb *bus, struct cam_et *start_target,
2085                   xpt_targetfunc_t *tr_func, void *arg)
2086 {
2087         struct cam_et *target, *next_target;
2088         int retval;
2089
2090         retval = 1;
2091         if (start_target)
2092                 target = start_target;
2093         else {
2094                 mtx_lock(&bus->eb_mtx);
2095                 target = TAILQ_FIRST(&bus->et_entries);
2096                 if (target == NULL) {
2097                         mtx_unlock(&bus->eb_mtx);
2098                         return (retval);
2099                 }
2100                 target->refcount++;
2101                 mtx_unlock(&bus->eb_mtx);
2102         }
2103         for (; target != NULL; target = next_target) {
2104                 retval = tr_func(target, arg);
2105                 if (retval == 0) {
2106                         xpt_release_target(target);
2107                         break;
2108                 }
2109                 mtx_lock(&bus->eb_mtx);
2110                 next_target = TAILQ_NEXT(target, links);
2111                 if (next_target)
2112                         next_target->refcount++;
2113                 mtx_unlock(&bus->eb_mtx);
2114                 xpt_release_target(target);
2115         }
2116         return(retval);
2117 }
2118
2119 static int
2120 xptdevicetraverse(struct cam_et *target, struct cam_ed *start_device,
2121                   xpt_devicefunc_t *tr_func, void *arg)
2122 {
2123         struct cam_eb *bus;
2124         struct cam_ed *device, *next_device;
2125         int retval;
2126
2127         retval = 1;
2128         bus = target->bus;
2129         if (start_device)
2130                 device = start_device;
2131         else {
2132                 mtx_lock(&bus->eb_mtx);
2133                 device = TAILQ_FIRST(&target->ed_entries);
2134                 if (device == NULL) {
2135                         mtx_unlock(&bus->eb_mtx);
2136                         return (retval);
2137                 }
2138                 device->refcount++;
2139                 mtx_unlock(&bus->eb_mtx);
2140         }
2141         for (; device != NULL; device = next_device) {
2142                 mtx_lock(&device->device_mtx);
2143                 retval = tr_func(device, arg);
2144                 mtx_unlock(&device->device_mtx);
2145                 if (retval == 0) {
2146                         xpt_release_device(device);
2147                         break;
2148                 }
2149                 mtx_lock(&bus->eb_mtx);
2150                 next_device = TAILQ_NEXT(device, links);
2151                 if (next_device)
2152                         next_device->refcount++;
2153                 mtx_unlock(&bus->eb_mtx);
2154                 xpt_release_device(device);
2155         }
2156         return(retval);
2157 }
2158
2159 static int
2160 xptperiphtraverse(struct cam_ed *device, struct cam_periph *start_periph,
2161                   xpt_periphfunc_t *tr_func, void *arg)
2162 {
2163         struct cam_eb *bus;
2164         struct cam_periph *periph, *next_periph;
2165         int retval;
2166
2167         retval = 1;
2168
2169         bus = device->target->bus;
2170         if (start_periph)
2171                 periph = start_periph;
2172         else {
2173                 xpt_lock_buses();
2174                 mtx_lock(&bus->eb_mtx);
2175                 periph = SLIST_FIRST(&device->periphs);
2176                 while (periph != NULL && (periph->flags & CAM_PERIPH_FREE) != 0)
2177                         periph = SLIST_NEXT(periph, periph_links);
2178                 if (periph == NULL) {
2179                         mtx_unlock(&bus->eb_mtx);
2180                         xpt_unlock_buses();
2181                         return (retval);
2182                 }
2183                 periph->refcount++;
2184                 mtx_unlock(&bus->eb_mtx);
2185                 xpt_unlock_buses();
2186         }
2187         for (; periph != NULL; periph = next_periph) {
2188                 retval = tr_func(periph, arg);
2189                 if (retval == 0) {
2190                         cam_periph_release_locked(periph);
2191                         break;
2192                 }
2193                 xpt_lock_buses();
2194                 mtx_lock(&bus->eb_mtx);
2195                 next_periph = SLIST_NEXT(periph, periph_links);
2196                 while (next_periph != NULL &&
2197                     (next_periph->flags & CAM_PERIPH_FREE) != 0)
2198                         next_periph = SLIST_NEXT(periph, periph_links);
2199                 if (next_periph)
2200                         next_periph->refcount++;
2201                 mtx_unlock(&bus->eb_mtx);
2202                 xpt_unlock_buses();
2203                 cam_periph_release_locked(periph);
2204         }
2205         return(retval);
2206 }
2207
2208 static int
2209 xptpdrvtraverse(struct periph_driver **start_pdrv,
2210                 xpt_pdrvfunc_t *tr_func, void *arg)
2211 {
2212         struct periph_driver **pdrv;
2213         int retval;
2214
2215         retval = 1;
2216
2217         /*
2218          * We don't traverse the peripheral driver list like we do the
2219          * other lists, because it is a linker set, and therefore cannot be
2220          * changed during runtime.  If the peripheral driver list is ever
2221          * re-done to be something other than a linker set (i.e. it can
2222          * change while the system is running), the list traversal should
2223          * be modified to work like the other traversal functions.
2224          */
2225         for (pdrv = (start_pdrv ? start_pdrv : periph_drivers);
2226              *pdrv != NULL; pdrv++) {
2227                 retval = tr_func(pdrv, arg);
2228
2229                 if (retval == 0)
2230                         return(retval);
2231         }
2232
2233         return(retval);
2234 }
2235
2236 static int
2237 xptpdperiphtraverse(struct periph_driver **pdrv,
2238                     struct cam_periph *start_periph,
2239                     xpt_periphfunc_t *tr_func, void *arg)
2240 {
2241         struct cam_periph *periph, *next_periph;
2242         int retval;
2243
2244         retval = 1;
2245
2246         if (start_periph)
2247                 periph = start_periph;
2248         else {
2249                 xpt_lock_buses();
2250                 periph = TAILQ_FIRST(&(*pdrv)->units);
2251                 while (periph != NULL && (periph->flags & CAM_PERIPH_FREE) != 0)
2252                         periph = TAILQ_NEXT(periph, unit_links);
2253                 if (periph == NULL) {
2254                         xpt_unlock_buses();
2255                         return (retval);
2256                 }
2257                 periph->refcount++;
2258                 xpt_unlock_buses();
2259         }
2260         for (; periph != NULL; periph = next_periph) {
2261                 cam_periph_lock(periph);
2262                 retval = tr_func(periph, arg);
2263                 cam_periph_unlock(periph);
2264                 if (retval == 0) {
2265                         cam_periph_release(periph);
2266                         break;
2267                 }
2268                 xpt_lock_buses();
2269                 next_periph = TAILQ_NEXT(periph, unit_links);
2270                 while (next_periph != NULL &&
2271                     (next_periph->flags & CAM_PERIPH_FREE) != 0)
2272                         next_periph = TAILQ_NEXT(periph, unit_links);
2273                 if (next_periph)
2274                         next_periph->refcount++;
2275                 xpt_unlock_buses();
2276                 cam_periph_release(periph);
2277         }
2278         return(retval);
2279 }
2280
2281 static int
2282 xptdefbusfunc(struct cam_eb *bus, void *arg)
2283 {
2284         struct xpt_traverse_config *tr_config;
2285
2286         tr_config = (struct xpt_traverse_config *)arg;
2287
2288         if (tr_config->depth == XPT_DEPTH_BUS) {
2289                 xpt_busfunc_t *tr_func;
2290
2291                 tr_func = (xpt_busfunc_t *)tr_config->tr_func;
2292
2293                 return(tr_func(bus, tr_config->tr_arg));
2294         } else
2295                 return(xpttargettraverse(bus, NULL, xptdeftargetfunc, arg));
2296 }
2297
2298 static int
2299 xptdeftargetfunc(struct cam_et *target, void *arg)
2300 {
2301         struct xpt_traverse_config *tr_config;
2302
2303         tr_config = (struct xpt_traverse_config *)arg;
2304
2305         if (tr_config->depth == XPT_DEPTH_TARGET) {
2306                 xpt_targetfunc_t *tr_func;
2307
2308                 tr_func = (xpt_targetfunc_t *)tr_config->tr_func;
2309
2310                 return(tr_func(target, tr_config->tr_arg));
2311         } else
2312                 return(xptdevicetraverse(target, NULL, xptdefdevicefunc, arg));
2313 }
2314
2315 static int
2316 xptdefdevicefunc(struct cam_ed *device, void *arg)
2317 {
2318         struct xpt_traverse_config *tr_config;
2319
2320         tr_config = (struct xpt_traverse_config *)arg;
2321
2322         if (tr_config->depth == XPT_DEPTH_DEVICE) {
2323                 xpt_devicefunc_t *tr_func;
2324
2325                 tr_func = (xpt_devicefunc_t *)tr_config->tr_func;
2326
2327                 return(tr_func(device, tr_config->tr_arg));
2328         } else
2329                 return(xptperiphtraverse(device, NULL, xptdefperiphfunc, arg));
2330 }
2331
2332 static int
2333 xptdefperiphfunc(struct cam_periph *periph, void *arg)
2334 {
2335         struct xpt_traverse_config *tr_config;
2336         xpt_periphfunc_t *tr_func;
2337
2338         tr_config = (struct xpt_traverse_config *)arg;
2339
2340         tr_func = (xpt_periphfunc_t *)tr_config->tr_func;
2341
2342         /*
2343          * Unlike the other default functions, we don't check for depth
2344          * here.  The peripheral driver level is the last level in the EDT,
2345          * so if we're here, we should execute the function in question.
2346          */
2347         return(tr_func(periph, tr_config->tr_arg));
2348 }
2349
2350 /*
2351  * Execute the given function for every bus in the EDT.
2352  */
2353 static int
2354 xpt_for_all_busses(xpt_busfunc_t *tr_func, void *arg)
2355 {
2356         struct xpt_traverse_config tr_config;
2357
2358         tr_config.depth = XPT_DEPTH_BUS;
2359         tr_config.tr_func = tr_func;
2360         tr_config.tr_arg = arg;
2361
2362         return(xptbustraverse(NULL, xptdefbusfunc, &tr_config));
2363 }
2364
2365 /*
2366  * Execute the given function for every device in the EDT.
2367  */
2368 static int
2369 xpt_for_all_devices(xpt_devicefunc_t *tr_func, void *arg)
2370 {
2371         struct xpt_traverse_config tr_config;
2372
2373         tr_config.depth = XPT_DEPTH_DEVICE;
2374         tr_config.tr_func = tr_func;
2375         tr_config.tr_arg = arg;
2376
2377         return(xptbustraverse(NULL, xptdefbusfunc, &tr_config));
2378 }
2379
2380 static int
2381 xptsetasyncfunc(struct cam_ed *device, void *arg)
2382 {
2383         struct cam_path path;
2384         struct ccb_getdev cgd;
2385         struct ccb_setasync *csa = (struct ccb_setasync *)arg;
2386
2387         /*
2388          * Don't report unconfigured devices (Wildcard devs,
2389          * devices only for target mode, device instances
2390          * that have been invalidated but are waiting for
2391          * their last reference count to be released).
2392          */
2393         if ((device->flags & CAM_DEV_UNCONFIGURED) != 0)
2394                 return (1);
2395
2396         xpt_compile_path(&path,
2397                          NULL,
2398                          device->target->bus->path_id,
2399                          device->target->target_id,
2400                          device->lun_id);
2401         xpt_setup_ccb(&cgd.ccb_h, &path, CAM_PRIORITY_NORMAL);
2402         cgd.ccb_h.func_code = XPT_GDEV_TYPE;
2403         xpt_action((union ccb *)&cgd);
2404         csa->callback(csa->callback_arg,
2405                             AC_FOUND_DEVICE,
2406                             &path, &cgd);
2407         xpt_release_path(&path);
2408
2409         return(1);
2410 }
2411
2412 static int
2413 xptsetasyncbusfunc(struct cam_eb *bus, void *arg)
2414 {
2415         struct cam_path path;
2416         struct ccb_pathinq cpi;
2417         struct ccb_setasync *csa = (struct ccb_setasync *)arg;
2418
2419         xpt_compile_path(&path, /*periph*/NULL,
2420                          bus->path_id,
2421                          CAM_TARGET_WILDCARD,
2422                          CAM_LUN_WILDCARD);
2423         xpt_path_lock(&path);
2424         xpt_setup_ccb(&cpi.ccb_h, &path, CAM_PRIORITY_NORMAL);
2425         cpi.ccb_h.func_code = XPT_PATH_INQ;
2426         xpt_action((union ccb *)&cpi);
2427         csa->callback(csa->callback_arg,
2428                             AC_PATH_REGISTERED,
2429                             &path, &cpi);
2430         xpt_path_unlock(&path);
2431         xpt_release_path(&path);
2432
2433         return(1);
2434 }
2435
2436 void
2437 xpt_action(union ccb *start_ccb)
2438 {
2439
2440         CAM_DEBUG(start_ccb->ccb_h.path, CAM_DEBUG_TRACE, ("xpt_action\n"));
2441
2442         start_ccb->ccb_h.status = CAM_REQ_INPROG;
2443         (*(start_ccb->ccb_h.path->bus->xport->action))(start_ccb);
2444 }
2445
2446 void
2447 xpt_action_default(union ccb *start_ccb)
2448 {
2449         struct cam_path *path;
2450         struct cam_sim *sim;
2451         int lock;
2452
2453         path = start_ccb->ccb_h.path;
2454         CAM_DEBUG(path, CAM_DEBUG_TRACE, ("xpt_action_default\n"));
2455
2456         switch (start_ccb->ccb_h.func_code) {
2457         case XPT_SCSI_IO:
2458         {
2459                 struct cam_ed *device;
2460
2461                 /*
2462                  * For the sake of compatibility with SCSI-1
2463                  * devices that may not understand the identify
2464                  * message, we include lun information in the
2465                  * second byte of all commands.  SCSI-1 specifies
2466                  * that luns are a 3 bit value and reserves only 3
2467                  * bits for lun information in the CDB.  Later
2468                  * revisions of the SCSI spec allow for more than 8
2469                  * luns, but have deprecated lun information in the
2470                  * CDB.  So, if the lun won't fit, we must omit.
2471                  *
2472                  * Also be aware that during initial probing for devices,
2473                  * the inquiry information is unknown but initialized to 0.
2474                  * This means that this code will be exercised while probing
2475                  * devices with an ANSI revision greater than 2.
2476                  */
2477                 device = path->device;
2478                 if (device->protocol_version <= SCSI_REV_2
2479                  && start_ccb->ccb_h.target_lun < 8
2480                  && (start_ccb->ccb_h.flags & CAM_CDB_POINTER) == 0) {
2481
2482                         start_ccb->csio.cdb_io.cdb_bytes[1] |=
2483                             start_ccb->ccb_h.target_lun << 5;
2484                 }
2485                 start_ccb->csio.scsi_status = SCSI_STATUS_OK;
2486         }
2487         /* FALLTHROUGH */
2488         case XPT_TARGET_IO:
2489         case XPT_CONT_TARGET_IO:
2490                 start_ccb->csio.sense_resid = 0;
2491                 start_ccb->csio.resid = 0;
2492                 /* FALLTHROUGH */
2493         case XPT_ATA_IO:
2494                 if (start_ccb->ccb_h.func_code == XPT_ATA_IO)
2495                         start_ccb->ataio.resid = 0;
2496                 /* FALLTHROUGH */
2497         case XPT_RESET_DEV:
2498         case XPT_ENG_EXEC:
2499         case XPT_SMP_IO:
2500         {
2501                 struct cam_devq *devq;
2502
2503                 devq = path->bus->sim->devq;
2504                 mtx_lock(&devq->send_mtx);
2505                 cam_ccbq_insert_ccb(&path->device->ccbq, start_ccb);
2506                 if (xpt_schedule_devq(devq, path->device) != 0)
2507                         xpt_run_devq(devq);
2508                 mtx_unlock(&devq->send_mtx);
2509                 break;
2510         }
2511         case XPT_CALC_GEOMETRY:
2512                 /* Filter out garbage */
2513                 if (start_ccb->ccg.block_size == 0
2514                  || start_ccb->ccg.volume_size == 0) {
2515                         start_ccb->ccg.cylinders = 0;
2516                         start_ccb->ccg.heads = 0;
2517                         start_ccb->ccg.secs_per_track = 0;
2518                         start_ccb->ccb_h.status = CAM_REQ_CMP;
2519                         break;
2520                 }
2521 #if defined(PC98) || defined(__sparc64__)
2522                 /*
2523                  * In a PC-98 system, geometry translation depens on
2524                  * the "real" device geometry obtained from mode page 4.
2525                  * SCSI geometry translation is performed in the
2526                  * initialization routine of the SCSI BIOS and the result
2527                  * stored in host memory.  If the translation is available
2528                  * in host memory, use it.  If not, rely on the default
2529                  * translation the device driver performs.
2530                  * For sparc64, we may need adjust the geometry of large
2531                  * disks in order to fit the limitations of the 16-bit
2532                  * fields of the VTOC8 disk label.
2533                  */
2534                 if (scsi_da_bios_params(&start_ccb->ccg) != 0) {
2535                         start_ccb->ccb_h.status = CAM_REQ_CMP;
2536                         break;
2537                 }
2538 #endif
2539                 goto call_sim;
2540         case XPT_ABORT:
2541         {
2542                 union ccb* abort_ccb;
2543
2544                 abort_ccb = start_ccb->cab.abort_ccb;
2545                 if (XPT_FC_IS_DEV_QUEUED(abort_ccb)) {
2546
2547                         if (abort_ccb->ccb_h.pinfo.index >= 0) {
2548                                 struct cam_ccbq *ccbq;
2549                                 struct cam_ed *device;
2550
2551                                 device = abort_ccb->ccb_h.path->device;
2552                                 ccbq = &device->ccbq;
2553                                 cam_ccbq_remove_ccb(ccbq, abort_ccb);
2554                                 abort_ccb->ccb_h.status =
2555                                     CAM_REQ_ABORTED|CAM_DEV_QFRZN;
2556                                 xpt_freeze_devq(abort_ccb->ccb_h.path, 1);
2557                                 xpt_done(abort_ccb);
2558                                 start_ccb->ccb_h.status = CAM_REQ_CMP;
2559                                 break;
2560                         }
2561                         if (abort_ccb->ccb_h.pinfo.index == CAM_UNQUEUED_INDEX
2562                          && (abort_ccb->ccb_h.status & CAM_SIM_QUEUED) == 0) {
2563                                 /*
2564                                  * We've caught this ccb en route to
2565                                  * the SIM.  Flag it for abort and the
2566                                  * SIM will do so just before starting
2567                                  * real work on the CCB.
2568                                  */
2569                                 abort_ccb->ccb_h.status =
2570                                     CAM_REQ_ABORTED|CAM_DEV_QFRZN;
2571                                 xpt_freeze_devq(abort_ccb->ccb_h.path, 1);
2572                                 start_ccb->ccb_h.status = CAM_REQ_CMP;
2573                                 break;
2574                         }
2575                 }
2576                 if (XPT_FC_IS_QUEUED(abort_ccb)
2577                  && (abort_ccb->ccb_h.pinfo.index == CAM_DONEQ_INDEX)) {
2578                         /*
2579                          * It's already completed but waiting
2580                          * for our SWI to get to it.
2581                          */
2582                         start_ccb->ccb_h.status = CAM_UA_ABORT;
2583                         break;
2584                 }
2585                 /*
2586                  * If we weren't able to take care of the abort request
2587                  * in the XPT, pass the request down to the SIM for processing.
2588                  */
2589         }
2590         /* FALLTHROUGH */
2591         case XPT_ACCEPT_TARGET_IO:
2592         case XPT_EN_LUN:
2593         case XPT_IMMED_NOTIFY:
2594         case XPT_NOTIFY_ACK:
2595         case XPT_RESET_BUS:
2596         case XPT_IMMEDIATE_NOTIFY:
2597         case XPT_NOTIFY_ACKNOWLEDGE:
2598         case XPT_GET_SIM_KNOB:
2599         case XPT_SET_SIM_KNOB:
2600         case XPT_GET_TRAN_SETTINGS:
2601         case XPT_SET_TRAN_SETTINGS:
2602         case XPT_PATH_INQ:
2603 call_sim:
2604                 sim = path->bus->sim;
2605                 lock = (mtx_owned(sim->mtx) == 0);
2606                 if (lock)
2607                         CAM_SIM_LOCK(sim);
2608                 (*(sim->sim_action))(sim, start_ccb);
2609                 if (lock)
2610                         CAM_SIM_UNLOCK(sim);
2611                 break;
2612         case XPT_PATH_STATS:
2613                 start_ccb->cpis.last_reset = path->bus->last_reset;
2614                 start_ccb->ccb_h.status = CAM_REQ_CMP;
2615                 break;
2616         case XPT_GDEV_TYPE:
2617         {
2618                 struct cam_ed *dev;
2619
2620                 dev = path->device;
2621                 if ((dev->flags & CAM_DEV_UNCONFIGURED) != 0) {
2622                         start_ccb->ccb_h.status = CAM_DEV_NOT_THERE;
2623                 } else {
2624                         struct ccb_getdev *cgd;
2625
2626                         cgd = &start_ccb->cgd;
2627                         cgd->protocol = dev->protocol;
2628                         cgd->inq_data = dev->inq_data;
2629                         cgd->ident_data = dev->ident_data;
2630                         cgd->inq_flags = dev->inq_flags;
2631                         cgd->ccb_h.status = CAM_REQ_CMP;
2632                         cgd->serial_num_len = dev->serial_num_len;
2633                         if ((dev->serial_num_len > 0)
2634                          && (dev->serial_num != NULL))
2635                                 bcopy(dev->serial_num, cgd->serial_num,
2636                                       dev->serial_num_len);
2637                 }
2638                 break;
2639         }
2640         case XPT_GDEV_STATS:
2641         {
2642                 struct cam_ed *dev;
2643
2644                 dev = path->device;
2645                 if ((dev->flags & CAM_DEV_UNCONFIGURED) != 0) {
2646                         start_ccb->ccb_h.status = CAM_DEV_NOT_THERE;
2647                 } else {
2648                         struct ccb_getdevstats *cgds;
2649                         struct cam_eb *bus;
2650                         struct cam_et *tar;
2651                         struct cam_devq *devq;
2652
2653                         cgds = &start_ccb->cgds;
2654                         bus = path->bus;
2655                         tar = path->target;
2656                         devq = bus->sim->devq;
2657                         mtx_lock(&devq->send_mtx);
2658                         cgds->dev_openings = dev->ccbq.dev_openings;
2659                         cgds->dev_active = dev->ccbq.dev_active;
2660                         cgds->allocated = dev->ccbq.allocated;
2661                         cgds->queued = cam_ccbq_pending_ccb_count(&dev->ccbq);
2662                         cgds->held = cgds->allocated - cgds->dev_active -
2663                             cgds->queued;
2664                         cgds->last_reset = tar->last_reset;
2665                         cgds->maxtags = dev->maxtags;
2666                         cgds->mintags = dev->mintags;
2667                         if (timevalcmp(&tar->last_reset, &bus->last_reset, <))
2668                                 cgds->last_reset = bus->last_reset;
2669                         mtx_unlock(&devq->send_mtx);
2670                         cgds->ccb_h.status = CAM_REQ_CMP;
2671                 }
2672                 break;
2673         }
2674         case XPT_GDEVLIST:
2675         {
2676                 struct cam_periph       *nperiph;
2677                 struct periph_list      *periph_head;
2678                 struct ccb_getdevlist   *cgdl;
2679                 u_int                   i;
2680                 struct cam_ed           *device;
2681                 int                     found;
2682
2683
2684                 found = 0;
2685
2686                 /*
2687                  * Don't want anyone mucking with our data.
2688                  */
2689                 device = path->device;
2690                 periph_head = &device->periphs;
2691                 cgdl = &start_ccb->cgdl;
2692
2693                 /*
2694                  * Check and see if the list has changed since the user
2695                  * last requested a list member.  If so, tell them that the
2696                  * list has changed, and therefore they need to start over
2697                  * from the beginning.
2698                  */
2699                 if ((cgdl->index != 0) &&
2700                     (cgdl->generation != device->generation)) {
2701                         cgdl->status = CAM_GDEVLIST_LIST_CHANGED;
2702                         break;
2703                 }
2704
2705                 /*
2706                  * Traverse the list of peripherals and attempt to find
2707                  * the requested peripheral.
2708                  */
2709                 for (nperiph = SLIST_FIRST(periph_head), i = 0;
2710                      (nperiph != NULL) && (i <= cgdl->index);
2711                      nperiph = SLIST_NEXT(nperiph, periph_links), i++) {
2712                         if (i == cgdl->index) {
2713                                 strncpy(cgdl->periph_name,
2714                                         nperiph->periph_name,
2715                                         DEV_IDLEN);
2716                                 cgdl->unit_number = nperiph->unit_number;
2717                                 found = 1;
2718                         }
2719                 }
2720                 if (found == 0) {
2721                         cgdl->status = CAM_GDEVLIST_ERROR;
2722                         break;
2723                 }
2724
2725                 if (nperiph == NULL)
2726                         cgdl->status = CAM_GDEVLIST_LAST_DEVICE;
2727                 else
2728                         cgdl->status = CAM_GDEVLIST_MORE_DEVS;
2729
2730                 cgdl->index++;
2731                 cgdl->generation = device->generation;
2732
2733                 cgdl->ccb_h.status = CAM_REQ_CMP;
2734                 break;
2735         }
2736         case XPT_DEV_MATCH:
2737         {
2738                 dev_pos_type position_type;
2739                 struct ccb_dev_match *cdm;
2740
2741                 cdm = &start_ccb->cdm;
2742
2743                 /*
2744                  * There are two ways of getting at information in the EDT.
2745                  * The first way is via the primary EDT tree.  It starts
2746                  * with a list of busses, then a list of targets on a bus,
2747                  * then devices/luns on a target, and then peripherals on a
2748                  * device/lun.  The "other" way is by the peripheral driver
2749                  * lists.  The peripheral driver lists are organized by
2750                  * peripheral driver.  (obviously)  So it makes sense to
2751                  * use the peripheral driver list if the user is looking
2752                  * for something like "da1", or all "da" devices.  If the
2753                  * user is looking for something on a particular bus/target
2754                  * or lun, it's generally better to go through the EDT tree.
2755                  */
2756
2757                 if (cdm->pos.position_type != CAM_DEV_POS_NONE)
2758                         position_type = cdm->pos.position_type;
2759                 else {
2760                         u_int i;
2761
2762                         position_type = CAM_DEV_POS_NONE;
2763
2764                         for (i = 0; i < cdm->num_patterns; i++) {
2765                                 if ((cdm->patterns[i].type == DEV_MATCH_BUS)
2766                                  ||(cdm->patterns[i].type == DEV_MATCH_DEVICE)){
2767                                         position_type = CAM_DEV_POS_EDT;
2768                                         break;
2769                                 }
2770                         }
2771
2772                         if (cdm->num_patterns == 0)
2773                                 position_type = CAM_DEV_POS_EDT;
2774                         else if (position_type == CAM_DEV_POS_NONE)
2775                                 position_type = CAM_DEV_POS_PDRV;
2776                 }
2777
2778                 switch(position_type & CAM_DEV_POS_TYPEMASK) {
2779                 case CAM_DEV_POS_EDT:
2780                         xptedtmatch(cdm);
2781                         break;
2782                 case CAM_DEV_POS_PDRV:
2783                         xptperiphlistmatch(cdm);
2784                         break;
2785                 default:
2786                         cdm->status = CAM_DEV_MATCH_ERROR;
2787                         break;
2788                 }
2789
2790                 if (cdm->status == CAM_DEV_MATCH_ERROR)
2791                         start_ccb->ccb_h.status = CAM_REQ_CMP_ERR;
2792                 else
2793                         start_ccb->ccb_h.status = CAM_REQ_CMP;
2794
2795                 break;
2796         }
2797         case XPT_SASYNC_CB:
2798         {
2799                 struct ccb_setasync *csa;
2800                 struct async_node *cur_entry;
2801                 struct async_list *async_head;
2802                 u_int32_t added;
2803
2804                 csa = &start_ccb->csa;
2805                 added = csa->event_enable;
2806                 async_head = &path->device->asyncs;
2807
2808                 /*
2809                  * If there is already an entry for us, simply
2810                  * update it.
2811                  */
2812                 cur_entry = SLIST_FIRST(async_head);
2813                 while (cur_entry != NULL) {
2814                         if ((cur_entry->callback_arg == csa->callback_arg)
2815                          && (cur_entry->callback == csa->callback))
2816                                 break;
2817                         cur_entry = SLIST_NEXT(cur_entry, links);
2818                 }
2819
2820                 if (cur_entry != NULL) {
2821                         /*
2822                          * If the request has no flags set,
2823                          * remove the entry.
2824                          */
2825                         added &= ~cur_entry->event_enable;
2826                         if (csa->event_enable == 0) {
2827                                 SLIST_REMOVE(async_head, cur_entry,
2828                                              async_node, links);
2829                                 xpt_release_device(path->device);
2830                                 free(cur_entry, M_CAMXPT);
2831                         } else {
2832                                 cur_entry->event_enable = csa->event_enable;
2833                         }
2834                         csa->event_enable = added;
2835                 } else {
2836                         cur_entry = malloc(sizeof(*cur_entry), M_CAMXPT,
2837                                            M_NOWAIT);
2838                         if (cur_entry == NULL) {
2839                                 csa->ccb_h.status = CAM_RESRC_UNAVAIL;
2840                                 break;
2841                         }
2842                         cur_entry->event_enable = csa->event_enable;
2843                         cur_entry->event_lock =
2844                             mtx_owned(path->bus->sim->mtx) ? 1 : 0;
2845                         cur_entry->callback_arg = csa->callback_arg;
2846                         cur_entry->callback = csa->callback;
2847                         SLIST_INSERT_HEAD(async_head, cur_entry, links);
2848                         xpt_acquire_device(path->device);
2849                 }
2850                 start_ccb->ccb_h.status = CAM_REQ_CMP;
2851                 break;
2852         }
2853         case XPT_REL_SIMQ:
2854         {
2855                 struct ccb_relsim *crs;
2856                 struct cam_ed *dev;
2857
2858                 crs = &start_ccb->crs;
2859                 dev = path->device;
2860                 if (dev == NULL) {
2861
2862                         crs->ccb_h.status = CAM_DEV_NOT_THERE;
2863                         break;
2864                 }
2865
2866                 if ((crs->release_flags & RELSIM_ADJUST_OPENINGS) != 0) {
2867
2868                         /* Don't ever go below one opening */
2869                         if (crs->openings > 0) {
2870                                 xpt_dev_ccbq_resize(path, crs->openings);
2871                                 if (bootverbose) {
2872                                         xpt_print(path,
2873                                             "number of openings is now %d\n",
2874                                             crs->openings);
2875                                 }
2876                         }
2877                 }
2878
2879                 mtx_lock(&dev->sim->devq->send_mtx);
2880                 if ((crs->release_flags & RELSIM_RELEASE_AFTER_TIMEOUT) != 0) {
2881
2882                         if ((dev->flags & CAM_DEV_REL_TIMEOUT_PENDING) != 0) {
2883
2884                                 /*
2885                                  * Just extend the old timeout and decrement
2886                                  * the freeze count so that a single timeout
2887                                  * is sufficient for releasing the queue.
2888                                  */
2889                                 start_ccb->ccb_h.flags &= ~CAM_DEV_QFREEZE;
2890                                 callout_stop(&dev->callout);
2891                         } else {
2892
2893                                 start_ccb->ccb_h.flags |= CAM_DEV_QFREEZE;
2894                         }
2895
2896                         callout_reset(&dev->callout,
2897                             (crs->release_timeout * hz) / 1000,
2898                             xpt_release_devq_timeout, dev);
2899
2900                         dev->flags |= CAM_DEV_REL_TIMEOUT_PENDING;
2901
2902                 }
2903
2904                 if ((crs->release_flags & RELSIM_RELEASE_AFTER_CMDCMPLT) != 0) {
2905
2906                         if ((dev->flags & CAM_DEV_REL_ON_COMPLETE) != 0) {
2907                                 /*
2908                                  * Decrement the freeze count so that a single
2909                                  * completion is still sufficient to unfreeze
2910                                  * the queue.
2911                                  */
2912                                 start_ccb->ccb_h.flags &= ~CAM_DEV_QFREEZE;
2913                         } else {
2914
2915                                 dev->flags |= CAM_DEV_REL_ON_COMPLETE;
2916                                 start_ccb->ccb_h.flags |= CAM_DEV_QFREEZE;
2917                         }
2918                 }
2919
2920                 if ((crs->release_flags & RELSIM_RELEASE_AFTER_QEMPTY) != 0) {
2921
2922                         if ((dev->flags & CAM_DEV_REL_ON_QUEUE_EMPTY) != 0
2923                          || (dev->ccbq.dev_active == 0)) {
2924
2925                                 start_ccb->ccb_h.flags &= ~CAM_DEV_QFREEZE;
2926                         } else {
2927
2928                                 dev->flags |= CAM_DEV_REL_ON_QUEUE_EMPTY;
2929                                 start_ccb->ccb_h.flags |= CAM_DEV_QFREEZE;
2930                         }
2931                 }
2932                 mtx_unlock(&dev->sim->devq->send_mtx);
2933
2934                 if ((start_ccb->ccb_h.flags & CAM_DEV_QFREEZE) == 0)
2935                         xpt_release_devq(path, /*count*/1, /*run_queue*/TRUE);
2936                 start_ccb->crs.qfrozen_cnt = dev->ccbq.queue.qfrozen_cnt;
2937                 start_ccb->ccb_h.status = CAM_REQ_CMP;
2938                 break;
2939         }
2940         case XPT_DEBUG: {
2941                 struct cam_path *oldpath;
2942
2943                 /* Check that all request bits are supported. */
2944                 if (start_ccb->cdbg.flags & ~(CAM_DEBUG_COMPILE)) {
2945                         start_ccb->ccb_h.status = CAM_FUNC_NOTAVAIL;
2946                         break;
2947                 }
2948
2949                 cam_dflags = CAM_DEBUG_NONE;
2950                 if (cam_dpath != NULL) {
2951                         oldpath = cam_dpath;
2952                         cam_dpath = NULL;
2953                         xpt_free_path(oldpath);
2954                 }
2955                 if (start_ccb->cdbg.flags != CAM_DEBUG_NONE) {
2956                         if (xpt_create_path(&cam_dpath, NULL,
2957                                             start_ccb->ccb_h.path_id,
2958                                             start_ccb->ccb_h.target_id,
2959                                             start_ccb->ccb_h.target_lun) !=
2960                                             CAM_REQ_CMP) {
2961                                 start_ccb->ccb_h.status = CAM_RESRC_UNAVAIL;
2962                         } else {
2963                                 cam_dflags = start_ccb->cdbg.flags;
2964                                 start_ccb->ccb_h.status = CAM_REQ_CMP;
2965                                 xpt_print(cam_dpath, "debugging flags now %x\n",
2966                                     cam_dflags);
2967                         }
2968                 } else
2969                         start_ccb->ccb_h.status = CAM_REQ_CMP;
2970                 break;
2971         }
2972         case XPT_NOOP:
2973                 if ((start_ccb->ccb_h.flags & CAM_DEV_QFREEZE) != 0)
2974                         xpt_freeze_devq(path, 1);
2975                 start_ccb->ccb_h.status = CAM_REQ_CMP;
2976                 break;
2977         default:
2978         case XPT_SDEV_TYPE:
2979         case XPT_TERM_IO:
2980         case XPT_ENG_INQ:
2981                 /* XXX Implement */
2982                 printf("%s: CCB type %#x not supported\n", __func__,
2983                        start_ccb->ccb_h.func_code);
2984                 start_ccb->ccb_h.status = CAM_PROVIDE_FAIL;
2985                 if (start_ccb->ccb_h.func_code & XPT_FC_DEV_QUEUED) {
2986                         xpt_done(start_ccb);
2987                 }
2988                 break;
2989         }
2990 }
2991
2992 void
2993 xpt_polled_action(union ccb *start_ccb)
2994 {
2995         u_int32_t timeout;
2996         struct    cam_sim *sim;
2997         struct    cam_devq *devq;
2998         struct    cam_ed *dev;
2999
3000         timeout = start_ccb->ccb_h.timeout * 10;
3001         sim = start_ccb->ccb_h.path->bus->sim;
3002         devq = sim->devq;
3003         dev = start_ccb->ccb_h.path->device;
3004
3005         mtx_unlock(&dev->device_mtx);
3006
3007         /*
3008          * Steal an opening so that no other queued requests
3009          * can get it before us while we simulate interrupts.
3010          */
3011         mtx_lock(&devq->send_mtx);
3012         dev->ccbq.dev_openings--;
3013         while((devq->send_openings <= 0 || dev->ccbq.dev_openings < 0) &&
3014             (--timeout > 0)) {
3015                 mtx_unlock(&devq->send_mtx);
3016                 DELAY(100);
3017                 CAM_SIM_LOCK(sim);
3018                 (*(sim->sim_poll))(sim);
3019                 CAM_SIM_UNLOCK(sim);
3020                 camisr_runqueue();
3021                 mtx_lock(&devq->send_mtx);
3022         }
3023         dev->ccbq.dev_openings++;
3024         mtx_unlock(&devq->send_mtx);
3025
3026         if (timeout != 0) {
3027                 xpt_action(start_ccb);
3028                 while(--timeout > 0) {
3029                         CAM_SIM_LOCK(sim);
3030                         (*(sim->sim_poll))(sim);
3031                         CAM_SIM_UNLOCK(sim);
3032                         camisr_runqueue();
3033                         if ((start_ccb->ccb_h.status  & CAM_STATUS_MASK)
3034                             != CAM_REQ_INPROG)
3035                                 break;
3036                         DELAY(100);
3037                 }
3038                 if (timeout == 0) {
3039                         /*
3040                          * XXX Is it worth adding a sim_timeout entry
3041                          * point so we can attempt recovery?  If
3042                          * this is only used for dumps, I don't think
3043                          * it is.
3044                          */
3045                         start_ccb->ccb_h.status = CAM_CMD_TIMEOUT;
3046                 }
3047         } else {
3048                 start_ccb->ccb_h.status = CAM_RESRC_UNAVAIL;
3049         }
3050
3051         mtx_lock(&dev->device_mtx);
3052 }
3053
3054 /*
3055  * Schedule a peripheral driver to receive a ccb when its
3056  * target device has space for more transactions.
3057  */
3058 void
3059 xpt_schedule(struct cam_periph *periph, u_int32_t new_priority)
3060 {
3061
3062         CAM_DEBUG(periph->path, CAM_DEBUG_TRACE, ("xpt_schedule\n"));
3063         cam_periph_assert(periph, MA_OWNED);
3064         if (new_priority < periph->scheduled_priority) {
3065                 periph->scheduled_priority = new_priority;
3066                 xpt_run_allocq(periph, 0);
3067         }
3068 }
3069
3070
3071 /*
3072  * Schedule a device to run on a given queue.
3073  * If the device was inserted as a new entry on the queue,
3074  * return 1 meaning the device queue should be run. If we
3075  * were already queued, implying someone else has already
3076  * started the queue, return 0 so the caller doesn't attempt
3077  * to run the queue.
3078  */
3079 static int
3080 xpt_schedule_dev(struct camq *queue, cam_pinfo *pinfo,
3081                  u_int32_t new_priority)
3082 {
3083         int retval;
3084         u_int32_t old_priority;
3085
3086         CAM_DEBUG_PRINT(CAM_DEBUG_XPT, ("xpt_schedule_dev\n"));
3087
3088         old_priority = pinfo->priority;
3089
3090         /*
3091          * Are we already queued?
3092          */
3093         if (pinfo->index != CAM_UNQUEUED_INDEX) {
3094                 /* Simply reorder based on new priority */
3095                 if (new_priority < old_priority) {
3096                         camq_change_priority(queue, pinfo->index,
3097                                              new_priority);
3098                         CAM_DEBUG_PRINT(CAM_DEBUG_XPT,
3099                                         ("changed priority to %d\n",
3100                                          new_priority));
3101                         retval = 1;
3102                 } else
3103                         retval = 0;
3104         } else {
3105                 /* New entry on the queue */
3106                 if (new_priority < old_priority)
3107                         pinfo->priority = new_priority;
3108
3109                 CAM_DEBUG_PRINT(CAM_DEBUG_XPT,
3110                                 ("Inserting onto queue\n"));
3111                 pinfo->generation = ++queue->generation;
3112                 camq_insert(queue, pinfo);
3113                 retval = 1;
3114         }
3115         return (retval);
3116 }
3117
3118 static void
3119 xpt_run_allocq_task(void *context, int pending)
3120 {
3121         struct cam_periph *periph = context;
3122
3123         cam_periph_lock(periph);
3124         periph->flags &= ~CAM_PERIPH_RUN_TASK;
3125         xpt_run_allocq(periph, 1);
3126         cam_periph_unlock(periph);
3127         cam_periph_release(periph);
3128 }
3129
3130 static void
3131 xpt_run_allocq(struct cam_periph *periph, int sleep)
3132 {
3133         struct cam_ed   *device;
3134         union ccb       *ccb;
3135         uint32_t         prio;
3136
3137         cam_periph_assert(periph, MA_OWNED);
3138         if (periph->periph_allocating)
3139                 return;
3140         periph->periph_allocating = 1;
3141         CAM_DEBUG_PRINT(CAM_DEBUG_XPT, ("xpt_run_allocq(%p)\n", periph));
3142         device = periph->path->device;
3143         ccb = NULL;
3144 restart:
3145         while ((prio = min(periph->scheduled_priority,
3146             periph->immediate_priority)) != CAM_PRIORITY_NONE &&
3147             (periph->periph_allocated - (ccb != NULL ? 1 : 0) <
3148              device->ccbq.total_openings || prio <= CAM_PRIORITY_OOB)) {
3149
3150                 if (ccb == NULL &&
3151                     (ccb = xpt_get_ccb_nowait(periph)) == NULL) {
3152                         if (sleep) {
3153                                 ccb = xpt_get_ccb(periph);
3154                                 goto restart;
3155                         }
3156                         if (periph->flags & CAM_PERIPH_RUN_TASK)
3157                                 break;
3158                         cam_periph_doacquire(periph);
3159                         periph->flags |= CAM_PERIPH_RUN_TASK;
3160                         taskqueue_enqueue(xsoftc.xpt_taskq,
3161                             &periph->periph_run_task);
3162                         break;
3163                 }
3164                 xpt_setup_ccb(&ccb->ccb_h, periph->path, prio);
3165                 if (prio == periph->immediate_priority) {
3166                         periph->immediate_priority = CAM_PRIORITY_NONE;
3167                         CAM_DEBUG_PRINT(CAM_DEBUG_XPT,
3168                                         ("waking cam_periph_getccb()\n"));
3169                         SLIST_INSERT_HEAD(&periph->ccb_list, &ccb->ccb_h,
3170                                           periph_links.sle);
3171                         wakeup(&periph->ccb_list);
3172                 } else {
3173                         periph->scheduled_priority = CAM_PRIORITY_NONE;
3174                         CAM_DEBUG_PRINT(CAM_DEBUG_XPT,
3175                                         ("calling periph_start()\n"));
3176                         periph->periph_start(periph, ccb);
3177                 }
3178                 ccb = NULL;
3179         }
3180         if (ccb != NULL)
3181                 xpt_release_ccb(ccb);
3182         periph->periph_allocating = 0;
3183 }
3184
3185 static void
3186 xpt_run_devq(struct cam_devq *devq)
3187 {
3188         char cdb_str[(SCSI_MAX_CDBLEN * 3) + 1];
3189         int lock;
3190
3191         CAM_DEBUG_PRINT(CAM_DEBUG_XPT, ("xpt_run_devq\n"));
3192
3193         devq->send_queue.qfrozen_cnt++;
3194         while ((devq->send_queue.entries > 0)
3195             && (devq->send_openings > 0)
3196             && (devq->send_queue.qfrozen_cnt <= 1)) {
3197                 struct  cam_ed *device;
3198                 union ccb *work_ccb;
3199                 struct  cam_sim *sim;
3200
3201                 device = (struct cam_ed *)camq_remove(&devq->send_queue,
3202                                                            CAMQ_HEAD);
3203                 CAM_DEBUG_PRINT(CAM_DEBUG_XPT,
3204                                 ("running device %p\n", device));
3205
3206                 work_ccb = cam_ccbq_peek_ccb(&device->ccbq, CAMQ_HEAD);
3207                 if (work_ccb == NULL) {
3208                         printf("device on run queue with no ccbs???\n");
3209                         continue;
3210                 }
3211
3212                 if ((work_ccb->ccb_h.flags & CAM_HIGH_POWER) != 0) {
3213
3214                         mtx_lock(&xsoftc.xpt_highpower_lock);
3215                         if (xsoftc.num_highpower <= 0) {
3216                                 /*
3217                                  * We got a high power command, but we
3218                                  * don't have any available slots.  Freeze
3219                                  * the device queue until we have a slot
3220                                  * available.
3221                                  */
3222                                 xpt_freeze_devq_device(device, 1);
3223                                 STAILQ_INSERT_TAIL(&xsoftc.highpowerq, device,
3224                                                    highpowerq_entry);
3225
3226                                 mtx_unlock(&xsoftc.xpt_highpower_lock);
3227                                 continue;
3228                         } else {
3229                                 /*
3230                                  * Consume a high power slot while
3231                                  * this ccb runs.
3232                                  */
3233                                 xsoftc.num_highpower--;
3234                         }
3235                         mtx_unlock(&xsoftc.xpt_highpower_lock);
3236                 }
3237                 cam_ccbq_remove_ccb(&device->ccbq, work_ccb);
3238                 cam_ccbq_send_ccb(&device->ccbq, work_ccb);
3239                 devq->send_openings--;
3240                 devq->send_active++;
3241                 xpt_schedule_devq(devq, device);
3242                 mtx_unlock(&devq->send_mtx);
3243
3244                 if ((work_ccb->ccb_h.flags & CAM_DEV_QFREEZE) != 0) {
3245                         /*
3246                          * The client wants to freeze the queue
3247                          * after this CCB is sent.
3248                          */
3249                         xpt_freeze_devq(work_ccb->ccb_h.path, 1);
3250                 }
3251
3252                 /* In Target mode, the peripheral driver knows best... */
3253                 if (work_ccb->ccb_h.func_code == XPT_SCSI_IO) {
3254                         if ((device->inq_flags & SID_CmdQue) != 0
3255                          && work_ccb->csio.tag_action != CAM_TAG_ACTION_NONE)
3256                                 work_ccb->ccb_h.flags |= CAM_TAG_ACTION_VALID;
3257                         else
3258                                 /*
3259                                  * Clear this in case of a retried CCB that
3260                                  * failed due to a rejected tag.
3261                                  */
3262                                 work_ccb->ccb_h.flags &= ~CAM_TAG_ACTION_VALID;
3263                 }
3264
3265                 switch (work_ccb->ccb_h.func_code) {
3266                 case XPT_SCSI_IO:
3267                         CAM_DEBUG(work_ccb->ccb_h.path,
3268                             CAM_DEBUG_CDB,("%s. CDB: %s\n",
3269                              scsi_op_desc(work_ccb->csio.cdb_io.cdb_bytes[0],
3270                                           &device->inq_data),
3271                              scsi_cdb_string(work_ccb->csio.cdb_io.cdb_bytes,
3272                                              cdb_str, sizeof(cdb_str))));
3273                         break;
3274                 case XPT_ATA_IO:
3275                         CAM_DEBUG(work_ccb->ccb_h.path,
3276                             CAM_DEBUG_CDB,("%s. ACB: %s\n",
3277                              ata_op_string(&work_ccb->ataio.cmd),
3278                              ata_cmd_string(&work_ccb->ataio.cmd,
3279                                             cdb_str, sizeof(cdb_str))));
3280                         break;
3281                 default:
3282                         break;
3283                 }
3284
3285                 /*
3286                  * Device queues can be shared among multiple SIM instances
3287                  * that reside on different busses.  Use the SIM from the
3288                  * queued device, rather than the one from the calling bus.
3289                  */
3290                 sim = device->sim;
3291                 lock = (mtx_owned(sim->mtx) == 0);
3292                 if (lock)
3293                         CAM_SIM_LOCK(sim);
3294                 (*(sim->sim_action))(sim, work_ccb);
3295                 if (lock)
3296                         CAM_SIM_UNLOCK(sim);
3297                 mtx_lock(&devq->send_mtx);
3298         }
3299         devq->send_queue.qfrozen_cnt--;
3300 }
3301
3302 /*
3303  * This function merges stuff from the slave ccb into the master ccb, while
3304  * keeping important fields in the master ccb constant.
3305  */
3306 void
3307 xpt_merge_ccb(union ccb *master_ccb, union ccb *slave_ccb)
3308 {
3309
3310         /*
3311          * Pull fields that are valid for peripheral drivers to set
3312          * into the master CCB along with the CCB "payload".
3313          */
3314         master_ccb->ccb_h.retry_count = slave_ccb->ccb_h.retry_count;
3315         master_ccb->ccb_h.func_code = slave_ccb->ccb_h.func_code;
3316         master_ccb->ccb_h.timeout = slave_ccb->ccb_h.timeout;
3317         master_ccb->ccb_h.flags = slave_ccb->ccb_h.flags;
3318         bcopy(&(&slave_ccb->ccb_h)[1], &(&master_ccb->ccb_h)[1],
3319               sizeof(union ccb) - sizeof(struct ccb_hdr));
3320 }
3321
3322 void
3323 xpt_setup_ccb(struct ccb_hdr *ccb_h, struct cam_path *path, u_int32_t priority)
3324 {
3325
3326         CAM_DEBUG(path, CAM_DEBUG_TRACE, ("xpt_setup_ccb\n"));
3327         ccb_h->pinfo.priority = priority;
3328         ccb_h->path = path;
3329         ccb_h->path_id = path->bus->path_id;
3330         if (path->target)
3331                 ccb_h->target_id = path->target->target_id;
3332         else
3333                 ccb_h->target_id = CAM_TARGET_WILDCARD;
3334         if (path->device) {
3335                 ccb_h->target_lun = path->device->lun_id;
3336                 ccb_h->pinfo.generation = ++path->device->ccbq.queue.generation;
3337         } else {
3338                 ccb_h->target_lun = CAM_TARGET_WILDCARD;
3339         }
3340         ccb_h->pinfo.index = CAM_UNQUEUED_INDEX;
3341         ccb_h->flags = 0;
3342         ccb_h->xflags = 0;
3343 }
3344
3345 /* Path manipulation functions */
3346 cam_status
3347 xpt_create_path(struct cam_path **new_path_ptr, struct cam_periph *perph,
3348                 path_id_t path_id, target_id_t target_id, lun_id_t lun_id)
3349 {
3350         struct     cam_path *path;
3351         cam_status status;
3352
3353         path = (struct cam_path *)malloc(sizeof(*path), M_CAMPATH, M_NOWAIT);
3354
3355         if (path == NULL) {
3356                 status = CAM_RESRC_UNAVAIL;
3357                 return(status);
3358         }
3359         status = xpt_compile_path(path, perph, path_id, target_id, lun_id);
3360         if (status != CAM_REQ_CMP) {
3361                 free(path, M_CAMPATH);
3362                 path = NULL;
3363         }
3364         *new_path_ptr = path;
3365         return (status);
3366 }
3367
3368 cam_status
3369 xpt_create_path_unlocked(struct cam_path **new_path_ptr,
3370                          struct cam_periph *periph, path_id_t path_id,
3371                          target_id_t target_id, lun_id_t lun_id)
3372 {
3373
3374         return (xpt_create_path(new_path_ptr, periph, path_id, target_id,
3375             lun_id));
3376 }
3377
3378 cam_status
3379 xpt_compile_path(struct cam_path *new_path, struct cam_periph *perph,
3380                  path_id_t path_id, target_id_t target_id, lun_id_t lun_id)
3381 {
3382         struct       cam_eb *bus;
3383         struct       cam_et *target;
3384         struct       cam_ed *device;
3385         cam_status   status;
3386
3387         status = CAM_REQ_CMP;   /* Completed without error */
3388         target = NULL;          /* Wildcarded */
3389         device = NULL;          /* Wildcarded */
3390
3391         /*
3392          * We will potentially modify the EDT, so block interrupts
3393          * that may attempt to create cam paths.
3394          */
3395         bus = xpt_find_bus(path_id);
3396         if (bus == NULL) {
3397                 status = CAM_PATH_INVALID;
3398         } else {
3399                 xpt_lock_buses();
3400                 mtx_lock(&bus->eb_mtx);
3401                 target = xpt_find_target(bus, target_id);
3402                 if (target == NULL) {
3403                         /* Create one */
3404                         struct cam_et *new_target;
3405
3406                         new_target = xpt_alloc_target(bus, target_id);
3407                         if (new_target == NULL) {
3408                                 status = CAM_RESRC_UNAVAIL;
3409                         } else {
3410                                 target = new_target;
3411                         }
3412                 }
3413                 xpt_unlock_buses();
3414                 if (target != NULL) {
3415                         device = xpt_find_device(target, lun_id);
3416                         if (device == NULL) {
3417                                 /* Create one */
3418                                 struct cam_ed *new_device;
3419
3420                                 new_device =
3421                                     (*(bus->xport->alloc_device))(bus,
3422                                                                       target,
3423                                                                       lun_id);
3424                                 if (new_device == NULL) {
3425                                         status = CAM_RESRC_UNAVAIL;
3426                                 } else {
3427                                         device = new_device;
3428                                 }
3429                         }
3430                 }
3431                 mtx_unlock(&bus->eb_mtx);
3432         }
3433
3434         /*
3435          * Only touch the user's data if we are successful.
3436          */
3437         if (status == CAM_REQ_CMP) {
3438                 new_path->periph = perph;
3439                 new_path->bus = bus;
3440                 new_path->target = target;
3441                 new_path->device = device;
3442                 CAM_DEBUG(new_path, CAM_DEBUG_TRACE, ("xpt_compile_path\n"));
3443         } else {
3444                 if (device != NULL)
3445                         xpt_release_device(device);
3446                 if (target != NULL)
3447                         xpt_release_target(target);
3448                 if (bus != NULL)
3449                         xpt_release_bus(bus);
3450         }
3451         return (status);
3452 }
3453
3454 cam_status
3455 xpt_clone_path(struct cam_path **new_path_ptr, struct cam_path *path)
3456 {
3457         struct     cam_path *new_path;
3458
3459         new_path = (struct cam_path *)malloc(sizeof(*path), M_CAMPATH, M_NOWAIT);
3460         if (new_path == NULL)
3461                 return(CAM_RESRC_UNAVAIL);
3462         xpt_copy_path(new_path, path);
3463         *new_path_ptr = new_path;
3464         return (CAM_REQ_CMP);
3465 }
3466
3467 void
3468 xpt_copy_path(struct cam_path *new_path, struct cam_path *path)
3469 {
3470
3471         *new_path = *path;
3472         if (path->bus != NULL)
3473                 xpt_acquire_bus(path->bus);
3474         if (path->target != NULL)
3475                 xpt_acquire_target(path->target);
3476         if (path->device != NULL)
3477                 xpt_acquire_device(path->device);
3478 }
3479
3480 void
3481 xpt_release_path(struct cam_path *path)
3482 {
3483         CAM_DEBUG(path, CAM_DEBUG_TRACE, ("xpt_release_path\n"));
3484         if (path->device != NULL) {
3485                 xpt_release_device(path->device);
3486                 path->device = NULL;
3487         }
3488         if (path->target != NULL) {
3489                 xpt_release_target(path->target);
3490                 path->target = NULL;
3491         }
3492         if (path->bus != NULL) {
3493                 xpt_release_bus(path->bus);
3494                 path->bus = NULL;
3495         }
3496 }
3497
3498 void
3499 xpt_free_path(struct cam_path *path)
3500 {
3501
3502         CAM_DEBUG(path, CAM_DEBUG_TRACE, ("xpt_free_path\n"));
3503         xpt_release_path(path);
3504         free(path, M_CAMPATH);
3505 }
3506
3507 void
3508 xpt_path_counts(struct cam_path *path, uint32_t *bus_ref,
3509     uint32_t *periph_ref, uint32_t *target_ref, uint32_t *device_ref)
3510 {
3511
3512         xpt_lock_buses();
3513         if (bus_ref) {
3514                 if (path->bus)
3515                         *bus_ref = path->bus->refcount;
3516                 else
3517                         *bus_ref = 0;
3518         }
3519         if (periph_ref) {
3520                 if (path->periph)
3521                         *periph_ref = path->periph->refcount;
3522                 else
3523                         *periph_ref = 0;
3524         }
3525         xpt_unlock_buses();
3526         if (target_ref) {
3527                 if (path->target)
3528                         *target_ref = path->target->refcount;
3529                 else
3530                         *target_ref = 0;
3531         }
3532         if (device_ref) {
3533                 if (path->device)
3534                         *device_ref = path->device->refcount;
3535                 else
3536                         *device_ref = 0;
3537         }
3538 }
3539
3540 /*
3541  * Return -1 for failure, 0 for exact match, 1 for match with wildcards
3542  * in path1, 2 for match with wildcards in path2.
3543  */
3544 int
3545 xpt_path_comp(struct cam_path *path1, struct cam_path *path2)
3546 {
3547         int retval = 0;
3548
3549         if (path1->bus != path2->bus) {
3550                 if (path1->bus->path_id == CAM_BUS_WILDCARD)
3551                         retval = 1;
3552                 else if (path2->bus->path_id == CAM_BUS_WILDCARD)
3553                         retval = 2;
3554                 else
3555                         return (-1);
3556         }
3557         if (path1->target != path2->target) {
3558                 if (path1->target->target_id == CAM_TARGET_WILDCARD) {
3559                         if (retval == 0)
3560                                 retval = 1;
3561                 } else if (path2->target->target_id == CAM_TARGET_WILDCARD)
3562                         retval = 2;
3563                 else
3564                         return (-1);
3565         }
3566         if (path1->device != path2->device) {
3567                 if (path1->device->lun_id == CAM_LUN_WILDCARD) {
3568                         if (retval == 0)
3569                                 retval = 1;
3570                 } else if (path2->device->lun_id == CAM_LUN_WILDCARD)
3571                         retval = 2;
3572                 else
3573                         return (-1);
3574         }
3575         return (retval);
3576 }
3577
3578 int
3579 xpt_path_comp_dev(struct cam_path *path, struct cam_ed *dev)
3580 {
3581         int retval = 0;
3582
3583         if (path->bus != dev->target->bus) {
3584                 if (path->bus->path_id == CAM_BUS_WILDCARD)
3585                         retval = 1;
3586                 else if (dev->target->bus->path_id == CAM_BUS_WILDCARD)
3587                         retval = 2;
3588                 else
3589                         return (-1);
3590         }
3591         if (path->target != dev->target) {
3592                 if (path->target->target_id == CAM_TARGET_WILDCARD) {
3593                         if (retval == 0)
3594                                 retval = 1;
3595                 } else if (dev->target->target_id == CAM_TARGET_WILDCARD)
3596                         retval = 2;
3597                 else
3598                         return (-1);
3599         }
3600         if (path->device != dev) {
3601                 if (path->device->lun_id == CAM_LUN_WILDCARD) {
3602                         if (retval == 0)
3603                                 retval = 1;
3604                 } else if (dev->lun_id == CAM_LUN_WILDCARD)
3605                         retval = 2;
3606                 else
3607                         return (-1);
3608         }
3609         return (retval);
3610 }
3611
3612 void
3613 xpt_print_path(struct cam_path *path)
3614 {
3615
3616         if (path == NULL)
3617                 printf("(nopath): ");
3618         else {
3619                 if (path->periph != NULL)
3620                         printf("(%s%d:", path->periph->periph_name,
3621                                path->periph->unit_number);
3622                 else
3623                         printf("(noperiph:");
3624
3625                 if (path->bus != NULL)
3626                         printf("%s%d:%d:", path->bus->sim->sim_name,
3627                                path->bus->sim->unit_number,
3628                                path->bus->sim->bus_id);
3629                 else
3630                         printf("nobus:");
3631
3632                 if (path->target != NULL)
3633                         printf("%d:", path->target->target_id);
3634                 else
3635                         printf("X:");
3636
3637                 if (path->device != NULL)
3638                         printf("%jx): ", (uintmax_t)path->device->lun_id);
3639                 else
3640                         printf("X): ");
3641         }
3642 }
3643
3644 void
3645 xpt_print_device(struct cam_ed *device)
3646 {
3647
3648         if (device == NULL)
3649                 printf("(nopath): ");
3650         else {
3651                 printf("(noperiph:%s%d:%d:%d:%jx): ", device->sim->sim_name,
3652                        device->sim->unit_number,
3653                        device->sim->bus_id,
3654                        device->target->target_id,
3655                        (uintmax_t)device->lun_id);
3656         }
3657 }
3658
3659 void
3660 xpt_print(struct cam_path *path, const char *fmt, ...)
3661 {
3662         va_list ap;
3663         xpt_print_path(path);
3664         va_start(ap, fmt);
3665         vprintf(fmt, ap);
3666         va_end(ap);
3667 }
3668
3669 int
3670 xpt_path_string(struct cam_path *path, char *str, size_t str_len)
3671 {
3672         struct sbuf sb;
3673
3674         sbuf_new(&sb, str, str_len, 0);
3675
3676         if (path == NULL)
3677                 sbuf_printf(&sb, "(nopath): ");
3678         else {
3679                 if (path->periph != NULL)
3680                         sbuf_printf(&sb, "(%s%d:", path->periph->periph_name,
3681                                     path->periph->unit_number);
3682                 else
3683                         sbuf_printf(&sb, "(noperiph:");
3684
3685                 if (path->bus != NULL)
3686                         sbuf_printf(&sb, "%s%d:%d:", path->bus->sim->sim_name,
3687                                     path->bus->sim->unit_number,
3688                                     path->bus->sim->bus_id);
3689                 else
3690                         sbuf_printf(&sb, "nobus:");
3691
3692                 if (path->target != NULL)
3693                         sbuf_printf(&sb, "%d:", path->target->target_id);
3694                 else
3695                         sbuf_printf(&sb, "X:");
3696
3697                 if (path->device != NULL)
3698                         sbuf_printf(&sb, "%jx): ",
3699                             (uintmax_t)path->device->lun_id);
3700                 else
3701                         sbuf_printf(&sb, "X): ");
3702         }
3703         sbuf_finish(&sb);
3704
3705         return(sbuf_len(&sb));
3706 }
3707
3708 path_id_t
3709 xpt_path_path_id(struct cam_path *path)
3710 {
3711         return(path->bus->path_id);
3712 }
3713
3714 target_id_t
3715 xpt_path_target_id(struct cam_path *path)
3716 {
3717         if (path->target != NULL)
3718                 return (path->target->target_id);
3719         else
3720                 return (CAM_TARGET_WILDCARD);
3721 }
3722
3723 lun_id_t
3724 xpt_path_lun_id(struct cam_path *path)
3725 {
3726         if (path->device != NULL)
3727                 return (path->device->lun_id);
3728         else
3729                 return (CAM_LUN_WILDCARD);
3730 }
3731
3732 struct cam_sim *
3733 xpt_path_sim(struct cam_path *path)
3734 {
3735
3736         return (path->bus->sim);
3737 }
3738
3739 struct cam_periph*
3740 xpt_path_periph(struct cam_path *path)
3741 {
3742
3743         return (path->periph);
3744 }
3745
3746 int
3747 xpt_path_legacy_ata_id(struct cam_path *path)
3748 {
3749         struct cam_eb *bus;
3750         int bus_id;
3751
3752         if ((strcmp(path->bus->sim->sim_name, "ata") != 0) &&
3753             strcmp(path->bus->sim->sim_name, "ahcich") != 0 &&
3754             strcmp(path->bus->sim->sim_name, "mvsch") != 0 &&
3755             strcmp(path->bus->sim->sim_name, "siisch") != 0)
3756                 return (-1);
3757
3758         if (strcmp(path->bus->sim->sim_name, "ata") == 0 &&
3759             path->bus->sim->unit_number < 2) {
3760                 bus_id = path->bus->sim->unit_number;
3761         } else {
3762                 bus_id = 2;
3763                 xpt_lock_buses();
3764                 TAILQ_FOREACH(bus, &xsoftc.xpt_busses, links) {
3765                         if (bus == path->bus)
3766                                 break;
3767                         if ((strcmp(bus->sim->sim_name, "ata") == 0 &&
3768                              bus->sim->unit_number >= 2) ||
3769                             strcmp(bus->sim->sim_name, "ahcich") == 0 ||
3770                             strcmp(bus->sim->sim_name, "mvsch") == 0 ||
3771                             strcmp(bus->sim->sim_name, "siisch") == 0)
3772                                 bus_id++;
3773                 }
3774                 xpt_unlock_buses();
3775         }
3776         if (path->target != NULL) {
3777                 if (path->target->target_id < 2)
3778                         return (bus_id * 2 + path->target->target_id);
3779                 else
3780                         return (-1);
3781         } else
3782                 return (bus_id * 2);
3783 }
3784
3785 /*
3786  * Release a CAM control block for the caller.  Remit the cost of the structure
3787  * to the device referenced by the path.  If the this device had no 'credits'
3788  * and peripheral drivers have registered async callbacks for this notification
3789  * call them now.
3790  */
3791 void
3792 xpt_release_ccb(union ccb *free_ccb)
3793 {
3794         struct   cam_ed *device;
3795         struct   cam_periph *periph;
3796
3797         CAM_DEBUG_PRINT(CAM_DEBUG_XPT, ("xpt_release_ccb\n"));
3798         xpt_path_assert(free_ccb->ccb_h.path, MA_OWNED);
3799         device = free_ccb->ccb_h.path->device;
3800         periph = free_ccb->ccb_h.path->periph;
3801
3802         xpt_free_ccb(free_ccb);
3803         periph->periph_allocated--;
3804         cam_ccbq_release_opening(&device->ccbq);
3805         xpt_run_allocq(periph, 0);
3806 }
3807
3808 /* Functions accessed by SIM drivers */
3809
3810 static struct xpt_xport xport_default = {
3811         .alloc_device = xpt_alloc_device_default,
3812         .action = xpt_action_default,
3813         .async = xpt_dev_async_default,
3814 };
3815
3816 /*
3817  * A sim structure, listing the SIM entry points and instance
3818  * identification info is passed to xpt_bus_register to hook the SIM
3819  * into the CAM framework.  xpt_bus_register creates a cam_eb entry
3820  * for this new bus and places it in the array of busses and assigns
3821  * it a path_id.  The path_id may be influenced by "hard wiring"
3822  * information specified by the user.  Once interrupt services are
3823  * available, the bus will be probed.
3824  */
3825 int32_t
3826 xpt_bus_register(struct cam_sim *sim, device_t parent, u_int32_t bus)
3827 {
3828         struct cam_eb *new_bus;
3829         struct cam_eb *old_bus;
3830         struct ccb_pathinq cpi;
3831         struct cam_path *path;
3832         cam_status status;
3833
3834         mtx_assert(sim->mtx, MA_OWNED);
3835
3836         sim->bus_id = bus;
3837         new_bus = (struct cam_eb *)malloc(sizeof(*new_bus),
3838                                           M_CAMXPT, M_NOWAIT|M_ZERO);
3839         if (new_bus == NULL) {
3840                 /* Couldn't satisfy request */
3841                 return (CAM_RESRC_UNAVAIL);
3842         }
3843
3844         mtx_init(&new_bus->eb_mtx, "CAM bus lock", NULL, MTX_DEF);
3845         TAILQ_INIT(&new_bus->et_entries);
3846         cam_sim_hold(sim);
3847         new_bus->sim = sim;
3848         timevalclear(&new_bus->last_reset);
3849         new_bus->flags = 0;
3850         new_bus->refcount = 1;  /* Held until a bus_deregister event */
3851         new_bus->generation = 0;
3852
3853         xpt_lock_buses();
3854         sim->path_id = new_bus->path_id =
3855             xptpathid(sim->sim_name, sim->unit_number, sim->bus_id);
3856         old_bus = TAILQ_FIRST(&xsoftc.xpt_busses);
3857         while (old_bus != NULL
3858             && old_bus->path_id < new_bus->path_id)
3859                 old_bus = TAILQ_NEXT(old_bus, links);
3860         if (old_bus != NULL)
3861                 TAILQ_INSERT_BEFORE(old_bus, new_bus, links);
3862         else
3863                 TAILQ_INSERT_TAIL(&xsoftc.xpt_busses, new_bus, links);
3864         xsoftc.bus_generation++;
3865         xpt_unlock_buses();
3866
3867         /*
3868          * Set a default transport so that a PATH_INQ can be issued to
3869          * the SIM.  This will then allow for probing and attaching of
3870          * a more appropriate transport.
3871          */
3872         new_bus->xport = &xport_default;
3873
3874         status = xpt_create_path(&path, /*periph*/NULL, sim->path_id,
3875                                   CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD);
3876         if (status != CAM_REQ_CMP) {
3877                 xpt_release_bus(new_bus);
3878                 free(path, M_CAMXPT);
3879                 return (CAM_RESRC_UNAVAIL);
3880         }
3881
3882         xpt_setup_ccb(&cpi.ccb_h, path, CAM_PRIORITY_NORMAL);
3883         cpi.ccb_h.func_code = XPT_PATH_INQ;
3884         xpt_action((union ccb *)&cpi);
3885
3886         if (cpi.ccb_h.status == CAM_REQ_CMP) {
3887                 switch (cpi.transport) {
3888                 case XPORT_SPI:
3889                 case XPORT_SAS:
3890                 case XPORT_FC:
3891                 case XPORT_USB:
3892                 case XPORT_ISCSI:
3893                 case XPORT_SRP:
3894                 case XPORT_PPB:
3895                         new_bus->xport = scsi_get_xport();
3896                         break;
3897                 case XPORT_ATA:
3898                 case XPORT_SATA:
3899                         new_bus->xport = ata_get_xport();
3900                         break;
3901                 default:
3902                         new_bus->xport = &xport_default;
3903                         break;
3904                 }
3905         }
3906
3907         /* Notify interested parties */
3908         if (sim->path_id != CAM_XPT_PATH_ID) {
3909
3910                 xpt_async(AC_PATH_REGISTERED, path, &cpi);
3911                 if ((cpi.hba_misc & PIM_NOSCAN) == 0) {
3912                         union   ccb *scan_ccb;
3913
3914                         /* Initiate bus rescan. */
3915                         scan_ccb = xpt_alloc_ccb_nowait();
3916                         if (scan_ccb != NULL) {
3917                                 scan_ccb->ccb_h.path = path;
3918                                 scan_ccb->ccb_h.func_code = XPT_SCAN_BUS;
3919                                 scan_ccb->crcn.flags = 0;
3920                                 xpt_rescan(scan_ccb);
3921                         } else {
3922                                 xpt_print(path,
3923                                           "Can't allocate CCB to scan bus\n");
3924                                 xpt_free_path(path);
3925                         }
3926                 } else
3927                         xpt_free_path(path);
3928         } else
3929                 xpt_free_path(path);
3930         return (CAM_SUCCESS);
3931 }
3932
3933 int32_t
3934 xpt_bus_deregister(path_id_t pathid)
3935 {
3936         struct cam_path bus_path;
3937         cam_status status;
3938
3939         status = xpt_compile_path(&bus_path, NULL, pathid,
3940                                   CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD);
3941         if (status != CAM_REQ_CMP)
3942                 return (status);
3943
3944         xpt_async(AC_LOST_DEVICE, &bus_path, NULL);
3945         xpt_async(AC_PATH_DEREGISTERED, &bus_path, NULL);
3946
3947         /* Release the reference count held while registered. */
3948         xpt_release_bus(bus_path.bus);
3949         xpt_release_path(&bus_path);
3950
3951         return (CAM_REQ_CMP);
3952 }
3953
3954 static path_id_t
3955 xptnextfreepathid(void)
3956 {
3957         struct cam_eb *bus;
3958         path_id_t pathid;
3959         const char *strval;
3960
3961         mtx_assert(&xsoftc.xpt_topo_lock, MA_OWNED);
3962         pathid = 0;
3963         bus = TAILQ_FIRST(&xsoftc.xpt_busses);
3964 retry:
3965         /* Find an unoccupied pathid */
3966         while (bus != NULL && bus->path_id <= pathid) {
3967                 if (bus->path_id == pathid)
3968                         pathid++;
3969                 bus = TAILQ_NEXT(bus, links);
3970         }
3971
3972         /*
3973          * Ensure that this pathid is not reserved for
3974          * a bus that may be registered in the future.
3975          */
3976         if (resource_string_value("scbus", pathid, "at", &strval) == 0) {
3977                 ++pathid;
3978                 /* Start the search over */
3979                 goto retry;
3980         }
3981         return (pathid);
3982 }
3983
3984 static path_id_t
3985 xptpathid(const char *sim_name, int sim_unit, int sim_bus)
3986 {
3987         path_id_t pathid;
3988         int i, dunit, val;
3989         char buf[32];
3990         const char *dname;
3991
3992         pathid = CAM_XPT_PATH_ID;
3993         snprintf(buf, sizeof(buf), "%s%d", sim_name, sim_unit);
3994         if (strcmp(buf, "xpt0") == 0 && sim_bus == 0)
3995                 return (pathid);
3996         i = 0;
3997         while ((resource_find_match(&i, &dname, &dunit, "at", buf)) == 0) {
3998                 if (strcmp(dname, "scbus")) {
3999                         /* Avoid a bit of foot shooting. */
4000                         continue;
4001                 }
4002                 if (dunit < 0)          /* unwired?! */
4003                         continue;
4004                 if (resource_int_value("scbus", dunit, "bus", &val) == 0) {
4005                         if (sim_bus == val) {
4006                                 pathid = dunit;
4007                                 break;
4008                         }
4009                 } else if (sim_bus == 0) {
4010                         /* Unspecified matches bus 0 */
4011                         pathid = dunit;
4012                         break;
4013                 } else {
4014                         printf("Ambiguous scbus configuration for %s%d "
4015                                "bus %d, cannot wire down.  The kernel "
4016                                "config entry for scbus%d should "
4017                                "specify a controller bus.\n"
4018                                "Scbus will be assigned dynamically.\n",
4019                                sim_name, sim_unit, sim_bus, dunit);
4020                         break;
4021                 }
4022         }
4023
4024         if (pathid == CAM_XPT_PATH_ID)
4025                 pathid = xptnextfreepathid();
4026         return (pathid);
4027 }
4028
4029 static const char *
4030 xpt_async_string(u_int32_t async_code)
4031 {
4032
4033         switch (async_code) {
4034         case AC_BUS_RESET: return ("AC_BUS_RESET");
4035         case AC_UNSOL_RESEL: return ("AC_UNSOL_RESEL");
4036         case AC_SCSI_AEN: return ("AC_SCSI_AEN");
4037         case AC_SENT_BDR: return ("AC_SENT_BDR");
4038         case AC_PATH_REGISTERED: return ("AC_PATH_REGISTERED");
4039         case AC_PATH_DEREGISTERED: return ("AC_PATH_DEREGISTERED");
4040         case AC_FOUND_DEVICE: return ("AC_FOUND_DEVICE");
4041         case AC_LOST_DEVICE: return ("AC_LOST_DEVICE");
4042         case AC_TRANSFER_NEG: return ("AC_TRANSFER_NEG");
4043         case AC_INQ_CHANGED: return ("AC_INQ_CHANGED");
4044         case AC_GETDEV_CHANGED: return ("AC_GETDEV_CHANGED");
4045         case AC_CONTRACT: return ("AC_CONTRACT");
4046         case AC_ADVINFO_CHANGED: return ("AC_ADVINFO_CHANGED");
4047         case AC_UNIT_ATTENTION: return ("AC_UNIT_ATTENTION");
4048         }
4049         return ("AC_UNKNOWN");
4050 }
4051
4052 static int
4053 xpt_async_size(u_int32_t async_code)
4054 {
4055
4056         switch (async_code) {
4057         case AC_BUS_RESET: return (0);
4058         case AC_UNSOL_RESEL: return (0);
4059         case AC_SCSI_AEN: return (0);
4060         case AC_SENT_BDR: return (0);
4061         case AC_PATH_REGISTERED: return (sizeof(struct ccb_pathinq));
4062         case AC_PATH_DEREGISTERED: return (0);
4063         case AC_FOUND_DEVICE: return (sizeof(struct ccb_getdev));
4064         case AC_LOST_DEVICE: return (0);
4065         case AC_TRANSFER_NEG: return (sizeof(struct ccb_trans_settings));
4066         case AC_INQ_CHANGED: return (0);
4067         case AC_GETDEV_CHANGED: return (0);
4068         case AC_CONTRACT: return (sizeof(struct ac_contract));
4069         case AC_ADVINFO_CHANGED: return (-1);
4070         case AC_UNIT_ATTENTION: return (sizeof(struct ccb_scsiio));
4071         }
4072         return (0);
4073 }
4074
4075 static int
4076 xpt_async_process_dev(struct cam_ed *device, void *arg)
4077 {
4078         union ccb *ccb = arg;
4079         struct cam_path *path = ccb->ccb_h.path;
4080         void *async_arg = ccb->casync.async_arg_ptr;
4081         u_int32_t async_code = ccb->casync.async_code;
4082         int relock;
4083
4084         if (path->device != device
4085          && path->device->lun_id != CAM_LUN_WILDCARD
4086          && device->lun_id != CAM_LUN_WILDCARD)
4087                 return (1);
4088
4089         /*
4090          * The async callback could free the device.
4091          * If it is a broadcast async, it doesn't hold
4092          * device reference, so take our own reference.
4093          */
4094         xpt_acquire_device(device);
4095
4096         /*
4097          * If async for specific device is to be delivered to
4098          * the wildcard client, take the specific device lock.
4099          * XXX: We may need a way for client to specify it.
4100          */
4101         if ((device->lun_id == CAM_LUN_WILDCARD &&
4102              path->device->lun_id != CAM_LUN_WILDCARD) ||
4103             (device->target->target_id == CAM_TARGET_WILDCARD &&
4104              path->target->target_id != CAM_TARGET_WILDCARD) ||
4105             (device->target->bus->path_id == CAM_BUS_WILDCARD &&
4106              path->target->bus->path_id != CAM_BUS_WILDCARD)) {
4107                 mtx_unlock(&device->device_mtx);
4108                 xpt_path_lock(path);
4109                 relock = 1;
4110         } else
4111                 relock = 0;
4112
4113         (*(device->target->bus->xport->async))(async_code,
4114             device->target->bus, device->target, device, async_arg);
4115         xpt_async_bcast(&device->asyncs, async_code, path, async_arg);
4116
4117         if (relock) {
4118                 xpt_path_unlock(path);
4119                 mtx_lock(&device->device_mtx);
4120         }
4121         xpt_release_device(device);
4122         return (1);
4123 }
4124
4125 static int
4126 xpt_async_process_tgt(struct cam_et *target, void *arg)
4127 {
4128         union ccb *ccb = arg;
4129         struct cam_path *path = ccb->ccb_h.path;
4130
4131         if (path->target != target
4132          && path->target->target_id != CAM_TARGET_WILDCARD
4133          && target->target_id != CAM_TARGET_WILDCARD)
4134                 return (1);
4135
4136         if (ccb->casync.async_code == AC_SENT_BDR) {
4137                 /* Update our notion of when the last reset occurred */
4138                 microtime(&target->last_reset);
4139         }
4140
4141         return (xptdevicetraverse(target, NULL, xpt_async_process_dev, ccb));
4142 }
4143
4144 static void
4145 xpt_async_process(struct cam_periph *periph, union ccb *ccb)
4146 {
4147         struct cam_eb *bus;
4148         struct cam_path *path;
4149         void *async_arg;
4150         u_int32_t async_code;
4151
4152         path = ccb->ccb_h.path;
4153         async_code = ccb->casync.async_code;
4154         async_arg = ccb->casync.async_arg_ptr;
4155         CAM_DEBUG(path, CAM_DEBUG_TRACE | CAM_DEBUG_INFO,
4156             ("xpt_async(%s)\n", xpt_async_string(async_code)));
4157         bus = path->bus;
4158
4159         if (async_code == AC_BUS_RESET) {
4160                 /* Update our notion of when the last reset occurred */
4161                 microtime(&bus->last_reset);
4162         }
4163
4164         xpttargettraverse(bus, NULL, xpt_async_process_tgt, ccb);
4165
4166         /*
4167          * If this wasn't a fully wildcarded async, tell all
4168          * clients that want all async events.
4169          */
4170         if (bus != xpt_periph->path->bus) {
4171                 xpt_path_lock(xpt_periph->path);
4172                 xpt_async_process_dev(xpt_periph->path->device, ccb);
4173                 xpt_path_unlock(xpt_periph->path);
4174         }
4175
4176         if (path->device != NULL && path->device->lun_id != CAM_LUN_WILDCARD)
4177                 xpt_release_devq(path, 1, TRUE);
4178         else
4179                 xpt_release_simq(path->bus->sim, TRUE);
4180         if (ccb->casync.async_arg_size > 0)
4181                 free(async_arg, M_CAMXPT);
4182         xpt_free_path(path);
4183         xpt_free_ccb(ccb);
4184 }
4185
4186 static void
4187 xpt_async_bcast(struct async_list *async_head,
4188                 u_int32_t async_code,
4189                 struct cam_path *path, void *async_arg)
4190 {
4191         struct async_node *cur_entry;
4192         int lock;
4193
4194         cur_entry = SLIST_FIRST(async_head);
4195         while (cur_entry != NULL) {
4196                 struct async_node *next_entry;
4197                 /*
4198                  * Grab the next list entry before we call the current
4199                  * entry's callback.  This is because the callback function
4200                  * can delete its async callback entry.
4201                  */
4202                 next_entry = SLIST_NEXT(cur_entry, links);
4203                 if ((cur_entry->event_enable & async_code) != 0) {
4204                         lock = cur_entry->event_lock;
4205                         if (lock)
4206                                 CAM_SIM_LOCK(path->device->sim);
4207                         cur_entry->callback(cur_entry->callback_arg,
4208                                             async_code, path,
4209                                             async_arg);
4210                         if (lock)
4211                                 CAM_SIM_UNLOCK(path->device->sim);
4212                 }
4213                 cur_entry = next_entry;
4214         }
4215 }
4216
4217 void
4218 xpt_async(u_int32_t async_code, struct cam_path *path, void *async_arg)
4219 {
4220         union ccb *ccb;
4221         int size;
4222
4223         ccb = xpt_alloc_ccb_nowait();
4224         if (ccb == NULL) {
4225                 xpt_print(path, "Can't allocate CCB to send %s\n",
4226                     xpt_async_string(async_code));
4227                 return;
4228         }
4229
4230         if (xpt_clone_path(&ccb->ccb_h.path, path) != CAM_REQ_CMP) {
4231                 xpt_print(path, "Can't allocate path to send %s\n",
4232                     xpt_async_string(async_code));
4233                 xpt_free_ccb(ccb);
4234                 return;
4235         }
4236         ccb->ccb_h.path->periph = NULL;
4237         ccb->ccb_h.func_code = XPT_ASYNC;
4238         ccb->ccb_h.cbfcnp = xpt_async_process;
4239         ccb->ccb_h.flags |= CAM_UNLOCKED;
4240         ccb->casync.async_code = async_code;
4241         ccb->casync.async_arg_size = 0;
4242         size = xpt_async_size(async_code);
4243         if (size > 0 && async_arg != NULL) {
4244                 ccb->casync.async_arg_ptr = malloc(size, M_CAMXPT, M_NOWAIT);
4245                 if (ccb->casync.async_arg_ptr == NULL) {
4246                         xpt_print(path, "Can't allocate argument to send %s\n",
4247                             xpt_async_string(async_code));
4248                         xpt_free_path(ccb->ccb_h.path);
4249                         xpt_free_ccb(ccb);
4250                         return;
4251                 }
4252                 memcpy(ccb->casync.async_arg_ptr, async_arg, size);
4253                 ccb->casync.async_arg_size = size;
4254         } else if (size < 0)
4255                 ccb->casync.async_arg_size = size;
4256         if (path->device != NULL && path->device->lun_id != CAM_LUN_WILDCARD)
4257                 xpt_freeze_devq(path, 1);
4258         else
4259                 xpt_freeze_simq(path->bus->sim, 1);
4260         xpt_done(ccb);
4261 }
4262
4263 static void
4264 xpt_dev_async_default(u_int32_t async_code, struct cam_eb *bus,
4265                       struct cam_et *target, struct cam_ed *device,
4266                       void *async_arg)
4267 {
4268
4269         /*
4270          * We only need to handle events for real devices.
4271          */
4272         if (target->target_id == CAM_TARGET_WILDCARD
4273          || device->lun_id == CAM_LUN_WILDCARD)
4274                 return;
4275
4276         printf("%s called\n", __func__);
4277 }
4278
4279 static uint32_t
4280 xpt_freeze_devq_device(struct cam_ed *dev, u_int count)
4281 {
4282         struct cam_devq *devq;
4283         uint32_t freeze;
4284
4285         devq = dev->sim->devq;
4286         mtx_assert(&devq->send_mtx, MA_OWNED);
4287         CAM_DEBUG_DEV(dev, CAM_DEBUG_TRACE,
4288             ("xpt_freeze_devq_device(%d) %u->%u\n", count,
4289             dev->ccbq.queue.qfrozen_cnt, dev->ccbq.queue.qfrozen_cnt + count));
4290         freeze = (dev->ccbq.queue.qfrozen_cnt += count);
4291         /* Remove frozen device from sendq. */
4292         if (device_is_queued(dev))
4293                 camq_remove(&devq->send_queue, dev->devq_entry.index);
4294         return (freeze);
4295 }
4296
4297 u_int32_t
4298 xpt_freeze_devq(struct cam_path *path, u_int count)
4299 {
4300         struct cam_ed   *dev = path->device;
4301         struct cam_devq *devq;
4302         uint32_t         freeze;
4303
4304         devq = dev->sim->devq;
4305         mtx_lock(&devq->send_mtx);
4306         CAM_DEBUG(path, CAM_DEBUG_TRACE, ("xpt_freeze_devq(%d)\n", count));
4307         freeze = xpt_freeze_devq_device(dev, count);
4308         mtx_unlock(&devq->send_mtx);
4309         return (freeze);
4310 }
4311
4312 u_int32_t
4313 xpt_freeze_simq(struct cam_sim *sim, u_int count)
4314 {
4315         struct cam_devq *devq;
4316         uint32_t         freeze;
4317
4318         devq = sim->devq;
4319         mtx_lock(&devq->send_mtx);
4320         freeze = (devq->send_queue.qfrozen_cnt += count);
4321         mtx_unlock(&devq->send_mtx);
4322         return (freeze);
4323 }
4324
4325 static void
4326 xpt_release_devq_timeout(void *arg)
4327 {
4328         struct cam_ed *dev;
4329         struct cam_devq *devq;
4330
4331         dev = (struct cam_ed *)arg;
4332         CAM_DEBUG_DEV(dev, CAM_DEBUG_TRACE, ("xpt_release_devq_timeout\n"));
4333         devq = dev->sim->devq;
4334         mtx_assert(&devq->send_mtx, MA_OWNED);
4335         if (xpt_release_devq_device(dev, /*count*/1, /*run_queue*/TRUE))
4336                 xpt_run_devq(devq);
4337 }
4338
4339 void
4340 xpt_release_devq(struct cam_path *path, u_int count, int run_queue)
4341 {
4342         struct cam_ed *dev;
4343         struct cam_devq *devq;
4344
4345         CAM_DEBUG(path, CAM_DEBUG_TRACE, ("xpt_release_devq(%d, %d)\n",
4346             count, run_queue));
4347         dev = path->device;
4348         devq = dev->sim->devq;
4349         mtx_lock(&devq->send_mtx);
4350         if (xpt_release_devq_device(dev, count, run_queue))
4351                 xpt_run_devq(dev->sim->devq);
4352         mtx_unlock(&devq->send_mtx);
4353 }
4354
4355 static int
4356 xpt_release_devq_device(struct cam_ed *dev, u_int count, int run_queue)
4357 {
4358
4359         mtx_assert(&dev->sim->devq->send_mtx, MA_OWNED);
4360         CAM_DEBUG_DEV(dev, CAM_DEBUG_TRACE,
4361             ("xpt_release_devq_device(%d, %d) %u->%u\n", count, run_queue,
4362             dev->ccbq.queue.qfrozen_cnt, dev->ccbq.queue.qfrozen_cnt - count));
4363         if (count > dev->ccbq.queue.qfrozen_cnt) {
4364 #ifdef INVARIANTS
4365                 printf("xpt_release_devq(): requested %u > present %u\n",
4366                     count, dev->ccbq.queue.qfrozen_cnt);
4367 #endif
4368                 count = dev->ccbq.queue.qfrozen_cnt;
4369         }
4370         dev->ccbq.queue.qfrozen_cnt -= count;
4371         if (dev->ccbq.queue.qfrozen_cnt == 0) {
4372                 /*
4373                  * No longer need to wait for a successful
4374                  * command completion.
4375                  */
4376                 dev->flags &= ~CAM_DEV_REL_ON_COMPLETE;
4377                 /*
4378                  * Remove any timeouts that might be scheduled
4379                  * to release this queue.
4380                  */
4381                 if ((dev->flags & CAM_DEV_REL_TIMEOUT_PENDING) != 0) {
4382                         callout_stop(&dev->callout);
4383                         dev->flags &= ~CAM_DEV_REL_TIMEOUT_PENDING;
4384                 }
4385                 /*
4386                  * Now that we are unfrozen schedule the
4387                  * device so any pending transactions are
4388                  * run.
4389                  */
4390                 xpt_schedule_devq(dev->sim->devq, dev);
4391         } else
4392                 run_queue = 0;
4393         return (run_queue);
4394 }
4395
4396 void
4397 xpt_release_simq(struct cam_sim *sim, int run_queue)
4398 {
4399         struct cam_devq *devq;
4400
4401         devq = sim->devq;
4402         mtx_lock(&devq->send_mtx);
4403         if (devq->send_queue.qfrozen_cnt <= 0) {
4404 #ifdef INVARIANTS
4405                 printf("xpt_release_simq: requested 1 > present %u\n",
4406                     devq->send_queue.qfrozen_cnt);
4407 #endif
4408         } else
4409                 devq->send_queue.qfrozen_cnt--;
4410         if (devq->send_queue.qfrozen_cnt == 0) {
4411                 /*
4412                  * If there is a timeout scheduled to release this
4413                  * sim queue, remove it.  The queue frozen count is
4414                  * already at 0.
4415                  */
4416                 if ((sim->flags & CAM_SIM_REL_TIMEOUT_PENDING) != 0){
4417                         callout_stop(&sim->callout);
4418                         sim->flags &= ~CAM_SIM_REL_TIMEOUT_PENDING;
4419                 }
4420                 if (run_queue) {
4421                         /*
4422                          * Now that we are unfrozen run the send queue.
4423                          */
4424                         xpt_run_devq(sim->devq);
4425                 }
4426         }
4427         mtx_unlock(&devq->send_mtx);
4428 }
4429
4430 /*
4431  * XXX Appears to be unused.
4432  */
4433 static void
4434 xpt_release_simq_timeout(void *arg)
4435 {
4436         struct cam_sim *sim;
4437
4438         sim = (struct cam_sim *)arg;
4439         xpt_release_simq(sim, /* run_queue */ TRUE);
4440 }
4441
4442 void
4443 xpt_done(union ccb *done_ccb)
4444 {
4445         struct cam_doneq *queue;
4446         int     run, hash;
4447
4448         CAM_DEBUG(done_ccb->ccb_h.path, CAM_DEBUG_TRACE, ("xpt_done\n"));
4449         if ((done_ccb->ccb_h.func_code & XPT_FC_QUEUED) == 0)
4450                 return;
4451
4452         hash = (done_ccb->ccb_h.path_id + done_ccb->ccb_h.target_id +
4453             done_ccb->ccb_h.target_lun) % cam_num_doneqs;
4454         queue = &cam_doneqs[hash];
4455         mtx_lock(&queue->cam_doneq_mtx);
4456         run = (queue->cam_doneq_sleep && STAILQ_EMPTY(&queue->cam_doneq));
4457         STAILQ_INSERT_TAIL(&queue->cam_doneq, &done_ccb->ccb_h, sim_links.stqe);
4458         done_ccb->ccb_h.pinfo.index = CAM_DONEQ_INDEX;
4459         mtx_unlock(&queue->cam_doneq_mtx);
4460         if (run)
4461                 wakeup(&queue->cam_doneq);
4462 }
4463
4464 void
4465 xpt_done_direct(union ccb *done_ccb)
4466 {
4467
4468         CAM_DEBUG(done_ccb->ccb_h.path, CAM_DEBUG_TRACE, ("xpt_done_direct\n"));
4469         if ((done_ccb->ccb_h.func_code & XPT_FC_QUEUED) == 0)
4470                 return;
4471
4472         xpt_done_process(&done_ccb->ccb_h);
4473 }
4474
4475 union ccb *
4476 xpt_alloc_ccb()
4477 {
4478         union ccb *new_ccb;
4479
4480         new_ccb = malloc(sizeof(*new_ccb), M_CAMCCB, M_ZERO|M_WAITOK);
4481         return (new_ccb);
4482 }
4483
4484 union ccb *
4485 xpt_alloc_ccb_nowait()
4486 {
4487         union ccb *new_ccb;
4488
4489         new_ccb = malloc(sizeof(*new_ccb), M_CAMCCB, M_ZERO|M_NOWAIT);
4490         return (new_ccb);
4491 }
4492
4493 void
4494 xpt_free_ccb(union ccb *free_ccb)
4495 {
4496         free(free_ccb, M_CAMCCB);
4497 }
4498
4499
4500
4501 /* Private XPT functions */
4502
4503 /*
4504  * Get a CAM control block for the caller. Charge the structure to the device
4505  * referenced by the path.  If we don't have sufficient resources to allocate
4506  * more ccbs, we return NULL.
4507  */
4508 static union ccb *
4509 xpt_get_ccb_nowait(struct cam_periph *periph)
4510 {
4511         union ccb *new_ccb;
4512
4513         new_ccb = malloc(sizeof(*new_ccb), M_CAMCCB, M_NOWAIT);
4514         if (new_ccb == NULL)
4515                 return (NULL);
4516         periph->periph_allocated++;
4517         cam_ccbq_take_opening(&periph->path->device->ccbq);
4518         return (new_ccb);
4519 }
4520
4521 static union ccb *
4522 xpt_get_ccb(struct cam_periph *periph)
4523 {
4524         union ccb *new_ccb;
4525
4526         cam_periph_unlock(periph);
4527         new_ccb = malloc(sizeof(*new_ccb), M_CAMCCB, M_WAITOK);
4528         cam_periph_lock(periph);
4529         periph->periph_allocated++;
4530         cam_ccbq_take_opening(&periph->path->device->ccbq);
4531         return (new_ccb);
4532 }
4533
4534 union ccb *
4535 cam_periph_getccb(struct cam_periph *periph, u_int32_t priority)
4536 {
4537         struct ccb_hdr *ccb_h;
4538
4539         CAM_DEBUG(periph->path, CAM_DEBUG_TRACE, ("cam_periph_getccb\n"));
4540         cam_periph_assert(periph, MA_OWNED);
4541         while ((ccb_h = SLIST_FIRST(&periph->ccb_list)) == NULL ||
4542             ccb_h->pinfo.priority != priority) {
4543                 if (priority < periph->immediate_priority) {
4544                         periph->immediate_priority = priority;
4545                         xpt_run_allocq(periph, 0);
4546                 } else
4547                         cam_periph_sleep(periph, &periph->ccb_list, PRIBIO,
4548                             "cgticb", 0);
4549         }
4550         SLIST_REMOVE_HEAD(&periph->ccb_list, periph_links.sle);
4551         return ((union ccb *)ccb_h);
4552 }
4553
4554 static void
4555 xpt_acquire_bus(struct cam_eb *bus)
4556 {
4557
4558         xpt_lock_buses();
4559         bus->refcount++;
4560         xpt_unlock_buses();
4561 }
4562
4563 static void
4564 xpt_release_bus(struct cam_eb *bus)
4565 {
4566
4567         xpt_lock_buses();
4568         KASSERT(bus->refcount >= 1, ("bus->refcount >= 1"));
4569         if (--bus->refcount > 0) {
4570                 xpt_unlock_buses();
4571                 return;
4572         }
4573         TAILQ_REMOVE(&xsoftc.xpt_busses, bus, links);
4574         xsoftc.bus_generation++;
4575         xpt_unlock_buses();
4576         KASSERT(TAILQ_EMPTY(&bus->et_entries),
4577             ("destroying bus, but target list is not empty"));
4578         cam_sim_release(bus->sim);
4579         mtx_destroy(&bus->eb_mtx);
4580         free(bus, M_CAMXPT);
4581 }
4582
4583 static struct cam_et *
4584 xpt_alloc_target(struct cam_eb *bus, target_id_t target_id)
4585 {
4586         struct cam_et *cur_target, *target;
4587
4588         mtx_assert(&xsoftc.xpt_topo_lock, MA_OWNED);
4589         mtx_assert(&bus->eb_mtx, MA_OWNED);
4590         target = (struct cam_et *)malloc(sizeof(*target), M_CAMXPT,
4591                                          M_NOWAIT|M_ZERO);
4592         if (target == NULL)
4593                 return (NULL);
4594
4595         TAILQ_INIT(&target->ed_entries);
4596         target->bus = bus;
4597         target->target_id = target_id;
4598         target->refcount = 1;
4599         target->generation = 0;
4600         target->luns = NULL;
4601         mtx_init(&target->luns_mtx, "CAM LUNs lock", NULL, MTX_DEF);
4602         timevalclear(&target->last_reset);
4603         /*
4604          * Hold a reference to our parent bus so it
4605          * will not go away before we do.
4606          */
4607         bus->refcount++;
4608
4609         /* Insertion sort into our bus's target list */
4610         cur_target = TAILQ_FIRST(&bus->et_entries);
4611         while (cur_target != NULL && cur_target->target_id < target_id)
4612                 cur_target = TAILQ_NEXT(cur_target, links);
4613         if (cur_target != NULL) {
4614                 TAILQ_INSERT_BEFORE(cur_target, target, links);
4615         } else {
4616                 TAILQ_INSERT_TAIL(&bus->et_entries, target, links);
4617         }
4618         bus->generation++;
4619         return (target);
4620 }
4621
4622 static void
4623 xpt_acquire_target(struct cam_et *target)
4624 {
4625         struct cam_eb *bus = target->bus;
4626
4627         mtx_lock(&bus->eb_mtx);
4628         target->refcount++;
4629         mtx_unlock(&bus->eb_mtx);
4630 }
4631
4632 static void
4633 xpt_release_target(struct cam_et *target)
4634 {
4635         struct cam_eb *bus = target->bus;
4636
4637         mtx_lock(&bus->eb_mtx);
4638         if (--target->refcount > 0) {
4639                 mtx_unlock(&bus->eb_mtx);
4640                 return;
4641         }
4642         TAILQ_REMOVE(&bus->et_entries, target, links);
4643         bus->generation++;
4644         mtx_unlock(&bus->eb_mtx);
4645         KASSERT(TAILQ_EMPTY(&target->ed_entries),
4646             ("destroying target, but device list is not empty"));
4647         xpt_release_bus(bus);
4648         mtx_destroy(&target->luns_mtx);
4649         if (target->luns)
4650                 free(target->luns, M_CAMXPT);
4651         free(target, M_CAMXPT);
4652 }
4653
4654 static struct cam_ed *
4655 xpt_alloc_device_default(struct cam_eb *bus, struct cam_et *target,
4656                          lun_id_t lun_id)
4657 {
4658         struct cam_ed *device;
4659
4660         device = xpt_alloc_device(bus, target, lun_id);
4661         if (device == NULL)
4662                 return (NULL);
4663
4664         device->mintags = 1;
4665         device->maxtags = 1;
4666         return (device);
4667 }
4668
4669 static void
4670 xpt_destroy_device(void *context, int pending)
4671 {
4672         struct cam_ed   *device = context;
4673
4674         mtx_lock(&device->device_mtx);
4675         mtx_destroy(&device->device_mtx);
4676         free(device, M_CAMDEV);
4677 }
4678
4679 struct cam_ed *
4680 xpt_alloc_device(struct cam_eb *bus, struct cam_et *target, lun_id_t lun_id)
4681 {
4682         struct cam_ed   *cur_device, *device;
4683         struct cam_devq *devq;
4684         cam_status status;
4685
4686         mtx_assert(&bus->eb_mtx, MA_OWNED);
4687         /* Make space for us in the device queue on our bus */
4688         devq = bus->sim->devq;
4689         mtx_lock(&devq->send_mtx);
4690         status = cam_devq_resize(devq, devq->send_queue.array_size + 1);
4691         mtx_unlock(&devq->send_mtx);
4692         if (status != CAM_REQ_CMP)
4693                 return (NULL);
4694
4695         device = (struct cam_ed *)malloc(sizeof(*device),
4696                                          M_CAMDEV, M_NOWAIT|M_ZERO);
4697         if (device == NULL)
4698                 return (NULL);
4699
4700         cam_init_pinfo(&device->devq_entry);
4701         device->target = target;
4702         device->lun_id = lun_id;
4703         device->sim = bus->sim;
4704         if (cam_ccbq_init(&device->ccbq,
4705                           bus->sim->max_dev_openings) != 0) {
4706                 free(device, M_CAMDEV);
4707                 return (NULL);
4708         }
4709         SLIST_INIT(&device->asyncs);
4710         SLIST_INIT(&device->periphs);
4711         device->generation = 0;
4712         device->flags = CAM_DEV_UNCONFIGURED;
4713         device->tag_delay_count = 0;
4714         device->tag_saved_openings = 0;
4715         device->refcount = 1;
4716         mtx_init(&device->device_mtx, "CAM device lock", NULL, MTX_DEF);
4717         callout_init_mtx(&device->callout, &devq->send_mtx, 0);
4718         TASK_INIT(&device->device_destroy_task, 0, xpt_destroy_device, device);
4719         /*
4720          * Hold a reference to our parent bus so it
4721          * will not go away before we do.
4722          */
4723         target->refcount++;
4724
4725         cur_device = TAILQ_FIRST(&target->ed_entries);
4726         while (cur_device != NULL && cur_device->lun_id < lun_id)
4727                 cur_device = TAILQ_NEXT(cur_device, links);
4728         if (cur_device != NULL)
4729                 TAILQ_INSERT_BEFORE(cur_device, device, links);
4730         else
4731                 TAILQ_INSERT_TAIL(&target->ed_entries, device, links);
4732         target->generation++;
4733         return (device);
4734 }
4735
4736 void
4737 xpt_acquire_device(struct cam_ed *device)
4738 {
4739         struct cam_eb *bus = device->target->bus;
4740
4741         mtx_lock(&bus->eb_mtx);
4742         device->refcount++;
4743         mtx_unlock(&bus->eb_mtx);
4744 }
4745
4746 void
4747 xpt_release_device(struct cam_ed *device)
4748 {
4749         struct cam_eb *bus = device->target->bus;
4750         struct cam_devq *devq;
4751
4752         mtx_lock(&bus->eb_mtx);
4753         if (--device->refcount > 0) {
4754                 mtx_unlock(&bus->eb_mtx);
4755                 return;
4756         }
4757
4758         TAILQ_REMOVE(&device->target->ed_entries, device,links);
4759         device->target->generation++;
4760         mtx_unlock(&bus->eb_mtx);
4761
4762         /* Release our slot in the devq */
4763         devq = bus->sim->devq;
4764         mtx_lock(&devq->send_mtx);
4765         cam_devq_resize(devq, devq->send_queue.array_size - 1);
4766         mtx_unlock(&devq->send_mtx);
4767
4768         KASSERT(SLIST_EMPTY(&device->periphs),
4769             ("destroying device, but periphs list is not empty"));
4770         KASSERT(device->devq_entry.index == CAM_UNQUEUED_INDEX,
4771             ("destroying device while still queued for ccbs"));
4772
4773         if ((device->flags & CAM_DEV_REL_TIMEOUT_PENDING) != 0)
4774                 callout_stop(&device->callout);
4775
4776         xpt_release_target(device->target);
4777
4778         cam_ccbq_fini(&device->ccbq);
4779         /*
4780          * Free allocated memory.  free(9) does nothing if the
4781          * supplied pointer is NULL, so it is safe to call without
4782          * checking.
4783          */
4784         free(device->supported_vpds, M_CAMXPT);
4785         free(device->device_id, M_CAMXPT);
4786         free(device->physpath, M_CAMXPT);
4787         free(device->rcap_buf, M_CAMXPT);
4788         free(device->serial_num, M_CAMXPT);
4789         taskqueue_enqueue(xsoftc.xpt_taskq, &device->device_destroy_task);
4790 }
4791
4792 u_int32_t
4793 xpt_dev_ccbq_resize(struct cam_path *path, int newopenings)
4794 {
4795         int     result;
4796         struct  cam_ed *dev;
4797
4798         dev = path->device;
4799         mtx_lock(&dev->sim->devq->send_mtx);
4800         result = cam_ccbq_resize(&dev->ccbq, newopenings);
4801         mtx_unlock(&dev->sim->devq->send_mtx);
4802         if ((dev->flags & CAM_DEV_TAG_AFTER_COUNT) != 0
4803          || (dev->inq_flags & SID_CmdQue) != 0)
4804                 dev->tag_saved_openings = newopenings;
4805         return (result);
4806 }
4807
4808 static struct cam_eb *
4809 xpt_find_bus(path_id_t path_id)
4810 {
4811         struct cam_eb *bus;
4812
4813         xpt_lock_buses();
4814         for (bus = TAILQ_FIRST(&xsoftc.xpt_busses);
4815              bus != NULL;
4816              bus = TAILQ_NEXT(bus, links)) {
4817                 if (bus->path_id == path_id) {
4818                         bus->refcount++;
4819                         break;
4820                 }
4821         }
4822         xpt_unlock_buses();
4823         return (bus);
4824 }
4825
4826 static struct cam_et *
4827 xpt_find_target(struct cam_eb *bus, target_id_t target_id)
4828 {
4829         struct cam_et *target;
4830
4831         mtx_assert(&bus->eb_mtx, MA_OWNED);
4832         for (target = TAILQ_FIRST(&bus->et_entries);
4833              target != NULL;
4834              target = TAILQ_NEXT(target, links)) {
4835                 if (target->target_id == target_id) {
4836                         target->refcount++;
4837                         break;
4838                 }
4839         }
4840         return (target);
4841 }
4842
4843 static struct cam_ed *
4844 xpt_find_device(struct cam_et *target, lun_id_t lun_id)
4845 {
4846         struct cam_ed *device;
4847
4848         mtx_assert(&target->bus->eb_mtx, MA_OWNED);
4849         for (device = TAILQ_FIRST(&target->ed_entries);
4850              device != NULL;
4851              device = TAILQ_NEXT(device, links)) {
4852                 if (device->lun_id == lun_id) {
4853                         device->refcount++;
4854                         break;
4855                 }
4856         }
4857         return (device);
4858 }
4859
4860 void
4861 xpt_start_tags(struct cam_path *path)
4862 {
4863         struct ccb_relsim crs;
4864         struct cam_ed *device;
4865         struct cam_sim *sim;
4866         int    newopenings;
4867
4868         device = path->device;
4869         sim = path->bus->sim;
4870         device->flags &= ~CAM_DEV_TAG_AFTER_COUNT;
4871         xpt_freeze_devq(path, /*count*/1);
4872         device->inq_flags |= SID_CmdQue;
4873         if (device->tag_saved_openings != 0)
4874                 newopenings = device->tag_saved_openings;
4875         else
4876                 newopenings = min(device->maxtags,
4877                                   sim->max_tagged_dev_openings);
4878         xpt_dev_ccbq_resize(path, newopenings);
4879         xpt_async(AC_GETDEV_CHANGED, path, NULL);
4880         xpt_setup_ccb(&crs.ccb_h, path, CAM_PRIORITY_NORMAL);
4881         crs.ccb_h.func_code = XPT_REL_SIMQ;
4882         crs.release_flags = RELSIM_RELEASE_AFTER_QEMPTY;
4883         crs.openings
4884             = crs.release_timeout
4885             = crs.qfrozen_cnt
4886             = 0;
4887         xpt_action((union ccb *)&crs);
4888 }
4889
4890 void
4891 xpt_stop_tags(struct cam_path *path)
4892 {
4893         struct ccb_relsim crs;
4894         struct cam_ed *device;
4895         struct cam_sim *sim;
4896
4897         device = path->device;
4898         sim = path->bus->sim;
4899         device->flags &= ~CAM_DEV_TAG_AFTER_COUNT;
4900         device->tag_delay_count = 0;
4901         xpt_freeze_devq(path, /*count*/1);
4902         device->inq_flags &= ~SID_CmdQue;
4903         xpt_dev_ccbq_resize(path, sim->max_dev_openings);
4904         xpt_async(AC_GETDEV_CHANGED, path, NULL);
4905         xpt_setup_ccb(&crs.ccb_h, path, CAM_PRIORITY_NORMAL);
4906         crs.ccb_h.func_code = XPT_REL_SIMQ;
4907         crs.release_flags = RELSIM_RELEASE_AFTER_QEMPTY;
4908         crs.openings
4909             = crs.release_timeout
4910             = crs.qfrozen_cnt
4911             = 0;
4912         xpt_action((union ccb *)&crs);
4913 }
4914
4915 static void
4916 xpt_boot_delay(void *arg)
4917 {
4918
4919         xpt_release_boot();
4920 }
4921
4922 static void
4923 xpt_config(void *arg)
4924 {
4925         /*
4926          * Now that interrupts are enabled, go find our devices
4927          */
4928         if (taskqueue_start_threads(&xsoftc.xpt_taskq, 1, PRIBIO, "CAM taskq"))
4929                 printf("xpt_config: failed to create taskqueue thread.\n");
4930
4931         /* Setup debugging path */
4932         if (cam_dflags != CAM_DEBUG_NONE) {
4933                 if (xpt_create_path(&cam_dpath, NULL,
4934                                     CAM_DEBUG_BUS, CAM_DEBUG_TARGET,
4935                                     CAM_DEBUG_LUN) != CAM_REQ_CMP) {
4936                         printf("xpt_config: xpt_create_path() failed for debug"
4937                                " target %d:%d:%d, debugging disabled\n",
4938                                CAM_DEBUG_BUS, CAM_DEBUG_TARGET, CAM_DEBUG_LUN);
4939                         cam_dflags = CAM_DEBUG_NONE;
4940                 }
4941         } else
4942                 cam_dpath = NULL;
4943
4944         periphdriver_init(1);
4945         xpt_hold_boot();
4946         callout_init(&xsoftc.boot_callout, 1);
4947         callout_reset(&xsoftc.boot_callout, hz * xsoftc.boot_delay / 1000,
4948             xpt_boot_delay, NULL);
4949         /* Fire up rescan thread. */
4950         if (kproc_kthread_add(xpt_scanner_thread, NULL, &cam_proc, NULL, 0, 0,
4951             "cam", "scanner")) {
4952                 printf("xpt_config: failed to create rescan thread.\n");
4953         }
4954 }
4955
4956 void
4957 xpt_hold_boot(void)
4958 {
4959         xpt_lock_buses();
4960         xsoftc.buses_to_config++;
4961         xpt_unlock_buses();
4962 }
4963
4964 void
4965 xpt_release_boot(void)
4966 {
4967         xpt_lock_buses();
4968         xsoftc.buses_to_config--;
4969         if (xsoftc.buses_to_config == 0 && xsoftc.buses_config_done == 0) {
4970                 struct  xpt_task *task;
4971
4972                 xsoftc.buses_config_done = 1;
4973                 xpt_unlock_buses();
4974                 /* Call manually because we don't have any busses */
4975                 task = malloc(sizeof(struct xpt_task), M_CAMXPT, M_NOWAIT);
4976                 if (task != NULL) {
4977                         TASK_INIT(&task->task, 0, xpt_finishconfig_task, task);
4978                         taskqueue_enqueue(taskqueue_thread, &task->task);
4979                 }
4980         } else
4981                 xpt_unlock_buses();
4982 }
4983
4984 /*
4985  * If the given device only has one peripheral attached to it, and if that
4986  * peripheral is the passthrough driver, announce it.  This insures that the
4987  * user sees some sort of announcement for every peripheral in their system.
4988  */
4989 static int
4990 xptpassannouncefunc(struct cam_ed *device, void *arg)
4991 {
4992         struct cam_periph *periph;
4993         int i;
4994
4995         for (periph = SLIST_FIRST(&device->periphs), i = 0; periph != NULL;
4996              periph = SLIST_NEXT(periph, periph_links), i++);
4997
4998         periph = SLIST_FIRST(&device->periphs);
4999         if ((i == 1)
5000          && (strncmp(periph->periph_name, "pass", 4) == 0))
5001                 xpt_announce_periph(periph, NULL);
5002
5003         return(1);
5004 }
5005
5006 static void
5007 xpt_finishconfig_task(void *context, int pending)
5008 {
5009
5010         periphdriver_init(2);
5011         /*
5012          * Check for devices with no "standard" peripheral driver
5013          * attached.  For any devices like that, announce the
5014          * passthrough driver so the user will see something.
5015          */
5016         if (!bootverbose)
5017                 xpt_for_all_devices(xptpassannouncefunc, NULL);
5018
5019         /* Release our hook so that the boot can continue. */
5020         config_intrhook_disestablish(xsoftc.xpt_config_hook);
5021         free(xsoftc.xpt_config_hook, M_CAMXPT);
5022         xsoftc.xpt_config_hook = NULL;
5023
5024         free(context, M_CAMXPT);
5025 }
5026
5027 cam_status
5028 xpt_register_async(int event, ac_callback_t *cbfunc, void *cbarg,
5029                    struct cam_path *path)
5030 {
5031         struct ccb_setasync csa;
5032         cam_status status;
5033         int xptpath = 0;
5034
5035         if (path == NULL) {
5036                 status = xpt_create_path(&path, /*periph*/NULL, CAM_XPT_PATH_ID,
5037                                          CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD);
5038                 if (status != CAM_REQ_CMP)
5039                         return (status);
5040                 xpt_path_lock(path);
5041                 xptpath = 1;
5042         }
5043
5044         xpt_setup_ccb(&csa.ccb_h, path, CAM_PRIORITY_NORMAL);
5045         csa.ccb_h.func_code = XPT_SASYNC_CB;
5046         csa.event_enable = event;
5047         csa.callback = cbfunc;
5048         csa.callback_arg = cbarg;
5049         xpt_action((union ccb *)&csa);
5050         status = csa.ccb_h.status;
5051
5052         if (xptpath) {
5053                 xpt_path_unlock(path);
5054                 xpt_free_path(path);
5055         }
5056
5057         if ((status == CAM_REQ_CMP) &&
5058             (csa.event_enable & AC_FOUND_DEVICE)) {
5059                 /*
5060                  * Get this peripheral up to date with all
5061                  * the currently existing devices.
5062                  */
5063                 xpt_for_all_devices(xptsetasyncfunc, &csa);
5064         }
5065         if ((status == CAM_REQ_CMP) &&
5066             (csa.event_enable & AC_PATH_REGISTERED)) {
5067                 /*
5068                  * Get this peripheral up to date with all
5069                  * the currently existing busses.
5070                  */
5071                 xpt_for_all_busses(xptsetasyncbusfunc, &csa);
5072         }
5073
5074         return (status);
5075 }
5076
5077 static void
5078 xptaction(struct cam_sim *sim, union ccb *work_ccb)
5079 {
5080         CAM_DEBUG(work_ccb->ccb_h.path, CAM_DEBUG_TRACE, ("xptaction\n"));
5081
5082         switch (work_ccb->ccb_h.func_code) {
5083         /* Common cases first */
5084         case XPT_PATH_INQ:              /* Path routing inquiry */
5085         {
5086                 struct ccb_pathinq *cpi;
5087
5088                 cpi = &work_ccb->cpi;
5089                 cpi->version_num = 1; /* XXX??? */
5090                 cpi->hba_inquiry = 0;
5091                 cpi->target_sprt = 0;
5092                 cpi->hba_misc = 0;
5093                 cpi->hba_eng_cnt = 0;
5094                 cpi->max_target = 0;
5095                 cpi->max_lun = 0;
5096                 cpi->initiator_id = 0;
5097                 strncpy(cpi->sim_vid, "FreeBSD", SIM_IDLEN);
5098                 strncpy(cpi->hba_vid, "", HBA_IDLEN);
5099                 strncpy(cpi->dev_name, sim->sim_name, DEV_IDLEN);
5100                 cpi->unit_number = sim->unit_number;
5101                 cpi->bus_id = sim->bus_id;
5102                 cpi->base_transfer_speed = 0;
5103                 cpi->protocol = PROTO_UNSPECIFIED;
5104                 cpi->protocol_version = PROTO_VERSION_UNSPECIFIED;
5105                 cpi->transport = XPORT_UNSPECIFIED;
5106                 cpi->transport_version = XPORT_VERSION_UNSPECIFIED;
5107                 cpi->ccb_h.status = CAM_REQ_CMP;
5108                 xpt_done(work_ccb);
5109                 break;
5110         }
5111         default:
5112                 work_ccb->ccb_h.status = CAM_REQ_INVALID;
5113                 xpt_done(work_ccb);
5114                 break;
5115         }
5116 }
5117
5118 /*
5119  * The xpt as a "controller" has no interrupt sources, so polling
5120  * is a no-op.
5121  */
5122 static void
5123 xptpoll(struct cam_sim *sim)
5124 {
5125 }
5126
5127 void
5128 xpt_lock_buses(void)
5129 {
5130         mtx_lock(&xsoftc.xpt_topo_lock);
5131 }
5132
5133 void
5134 xpt_unlock_buses(void)
5135 {
5136         mtx_unlock(&xsoftc.xpt_topo_lock);
5137 }
5138
5139 struct mtx *
5140 xpt_path_mtx(struct cam_path *path)
5141 {
5142
5143         return (&path->device->device_mtx);
5144 }
5145
5146 static void
5147 xpt_done_process(struct ccb_hdr *ccb_h)
5148 {
5149         struct cam_sim *sim;
5150         struct cam_devq *devq;
5151         struct mtx *mtx = NULL;
5152
5153         if (ccb_h->flags & CAM_HIGH_POWER) {
5154                 struct highpowerlist    *hphead;
5155                 struct cam_ed           *device;
5156
5157                 mtx_lock(&xsoftc.xpt_highpower_lock);
5158                 hphead = &xsoftc.highpowerq;
5159
5160                 device = STAILQ_FIRST(hphead);
5161
5162                 /*
5163                  * Increment the count since this command is done.
5164                  */
5165                 xsoftc.num_highpower++;
5166
5167                 /*
5168                  * Any high powered commands queued up?
5169                  */
5170                 if (device != NULL) {
5171
5172                         STAILQ_REMOVE_HEAD(hphead, highpowerq_entry);
5173                         mtx_unlock(&xsoftc.xpt_highpower_lock);
5174
5175                         mtx_lock(&device->sim->devq->send_mtx);
5176                         xpt_release_devq_device(device,
5177                                          /*count*/1, /*runqueue*/TRUE);
5178                         mtx_unlock(&device->sim->devq->send_mtx);
5179                 } else
5180                         mtx_unlock(&xsoftc.xpt_highpower_lock);
5181         }
5182
5183         sim = ccb_h->path->bus->sim;
5184
5185         if (ccb_h->status & CAM_RELEASE_SIMQ) {
5186                 xpt_release_simq(sim, /*run_queue*/FALSE);
5187                 ccb_h->status &= ~CAM_RELEASE_SIMQ;
5188         }
5189
5190         if ((ccb_h->flags & CAM_DEV_QFRZDIS)
5191          && (ccb_h->status & CAM_DEV_QFRZN)) {
5192                 xpt_release_devq(ccb_h->path, /*count*/1, /*run_queue*/TRUE);
5193                 ccb_h->status &= ~CAM_DEV_QFRZN;
5194         }
5195
5196         devq = sim->devq;
5197         if ((ccb_h->func_code & XPT_FC_USER_CCB) == 0) {
5198                 struct cam_ed *dev = ccb_h->path->device;
5199
5200                 mtx_lock(&devq->send_mtx);
5201                 devq->send_active--;
5202                 devq->send_openings++;
5203                 cam_ccbq_ccb_done(&dev->ccbq, (union ccb *)ccb_h);
5204
5205                 if (((dev->flags & CAM_DEV_REL_ON_QUEUE_EMPTY) != 0
5206                   && (dev->ccbq.dev_active == 0))) {
5207                         dev->flags &= ~CAM_DEV_REL_ON_QUEUE_EMPTY;
5208                         xpt_release_devq_device(dev, /*count*/1,
5209                                          /*run_queue*/FALSE);
5210                 }
5211
5212                 if (((dev->flags & CAM_DEV_REL_ON_COMPLETE) != 0
5213                   && (ccb_h->status&CAM_STATUS_MASK) != CAM_REQUEUE_REQ)) {
5214                         dev->flags &= ~CAM_DEV_REL_ON_COMPLETE;
5215                         xpt_release_devq_device(dev, /*count*/1,
5216                                          /*run_queue*/FALSE);
5217                 }
5218
5219                 if (!device_is_queued(dev))
5220                         (void)xpt_schedule_devq(devq, dev);
5221                 xpt_run_devq(devq);
5222                 mtx_unlock(&devq->send_mtx);
5223
5224                 if ((dev->flags & CAM_DEV_TAG_AFTER_COUNT) != 0) {
5225                         mtx = xpt_path_mtx(ccb_h->path);
5226                         mtx_lock(mtx);
5227
5228                         if ((dev->flags & CAM_DEV_TAG_AFTER_COUNT) != 0
5229                          && (--dev->tag_delay_count == 0))
5230                                 xpt_start_tags(ccb_h->path);
5231                 }
5232         }
5233
5234         if ((ccb_h->flags & CAM_UNLOCKED) == 0) {
5235                 if (mtx == NULL) {
5236                         mtx = xpt_path_mtx(ccb_h->path);
5237                         mtx_lock(mtx);
5238                 }
5239         } else {
5240                 if (mtx != NULL) {
5241                         mtx_unlock(mtx);
5242                         mtx = NULL;
5243                 }
5244         }
5245
5246         /* Call the peripheral driver's callback */
5247         ccb_h->pinfo.index = CAM_UNQUEUED_INDEX;
5248         (*ccb_h->cbfcnp)(ccb_h->path->periph, (union ccb *)ccb_h);
5249         if (mtx != NULL)
5250                 mtx_unlock(mtx);
5251 }
5252
5253 void
5254 xpt_done_td(void *arg)
5255 {
5256         struct cam_doneq *queue = arg;
5257         struct ccb_hdr *ccb_h;
5258         STAILQ_HEAD(, ccb_hdr)  doneq;
5259
5260         STAILQ_INIT(&doneq);
5261         mtx_lock(&queue->cam_doneq_mtx);
5262         while (1) {
5263                 while (STAILQ_EMPTY(&queue->cam_doneq)) {
5264                         queue->cam_doneq_sleep = 1;
5265                         msleep(&queue->cam_doneq, &queue->cam_doneq_mtx,
5266                             PRIBIO, "-", 0);
5267                         queue->cam_doneq_sleep = 0;
5268                 }
5269                 STAILQ_CONCAT(&doneq, &queue->cam_doneq);
5270                 mtx_unlock(&queue->cam_doneq_mtx);
5271
5272                 THREAD_NO_SLEEPING();
5273                 while ((ccb_h = STAILQ_FIRST(&doneq)) != NULL) {
5274                         STAILQ_REMOVE_HEAD(&doneq, sim_links.stqe);
5275                         xpt_done_process(ccb_h);
5276                 }
5277                 THREAD_SLEEPING_OK();
5278
5279                 mtx_lock(&queue->cam_doneq_mtx);
5280         }
5281 }
5282
5283 static void
5284 camisr_runqueue(void)
5285 {
5286         struct  ccb_hdr *ccb_h;
5287         struct cam_doneq *queue;
5288         int i;
5289
5290         /* Process global queues. */
5291         for (i = 0; i < cam_num_doneqs; i++) {
5292                 queue = &cam_doneqs[i];
5293                 mtx_lock(&queue->cam_doneq_mtx);
5294                 while ((ccb_h = STAILQ_FIRST(&queue->cam_doneq)) != NULL) {
5295                         STAILQ_REMOVE_HEAD(&queue->cam_doneq, sim_links.stqe);
5296                         mtx_unlock(&queue->cam_doneq_mtx);
5297                         xpt_done_process(ccb_h);
5298                         mtx_lock(&queue->cam_doneq_mtx);
5299                 }
5300                 mtx_unlock(&queue->cam_doneq_mtx);
5301         }
5302 }