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
2652                         cgds = &start_ccb->cgds;
2653                         bus = path->bus;
2654                         tar = path->target;
2655                         cgds->dev_openings = dev->ccbq.dev_openings;
2656                         cgds->dev_active = dev->ccbq.dev_active;
2657                         cgds->devq_openings = dev->ccbq.devq_openings;
2658                         cgds->devq_queued = cam_ccbq_pending_ccb_count(&dev->ccbq);
2659                         cgds->held = dev->ccbq.held;
2660                         cgds->last_reset = tar->last_reset;
2661                         cgds->maxtags = dev->maxtags;
2662                         cgds->mintags = dev->mintags;
2663                         if (timevalcmp(&tar->last_reset, &bus->last_reset, <))
2664                                 cgds->last_reset = bus->last_reset;
2665                         cgds->ccb_h.status = CAM_REQ_CMP;
2666                 }
2667                 break;
2668         }
2669         case XPT_GDEVLIST:
2670         {
2671                 struct cam_periph       *nperiph;
2672                 struct periph_list      *periph_head;
2673                 struct ccb_getdevlist   *cgdl;
2674                 u_int                   i;
2675                 struct cam_ed           *device;
2676                 int                     found;
2677
2678
2679                 found = 0;
2680
2681                 /*
2682                  * Don't want anyone mucking with our data.
2683                  */
2684                 device = path->device;
2685                 periph_head = &device->periphs;
2686                 cgdl = &start_ccb->cgdl;
2687
2688                 /*
2689                  * Check and see if the list has changed since the user
2690                  * last requested a list member.  If so, tell them that the
2691                  * list has changed, and therefore they need to start over
2692                  * from the beginning.
2693                  */
2694                 if ((cgdl->index != 0) &&
2695                     (cgdl->generation != device->generation)) {
2696                         cgdl->status = CAM_GDEVLIST_LIST_CHANGED;
2697                         break;
2698                 }
2699
2700                 /*
2701                  * Traverse the list of peripherals and attempt to find
2702                  * the requested peripheral.
2703                  */
2704                 for (nperiph = SLIST_FIRST(periph_head), i = 0;
2705                      (nperiph != NULL) && (i <= cgdl->index);
2706                      nperiph = SLIST_NEXT(nperiph, periph_links), i++) {
2707                         if (i == cgdl->index) {
2708                                 strncpy(cgdl->periph_name,
2709                                         nperiph->periph_name,
2710                                         DEV_IDLEN);
2711                                 cgdl->unit_number = nperiph->unit_number;
2712                                 found = 1;
2713                         }
2714                 }
2715                 if (found == 0) {
2716                         cgdl->status = CAM_GDEVLIST_ERROR;
2717                         break;
2718                 }
2719
2720                 if (nperiph == NULL)
2721                         cgdl->status = CAM_GDEVLIST_LAST_DEVICE;
2722                 else
2723                         cgdl->status = CAM_GDEVLIST_MORE_DEVS;
2724
2725                 cgdl->index++;
2726                 cgdl->generation = device->generation;
2727
2728                 cgdl->ccb_h.status = CAM_REQ_CMP;
2729                 break;
2730         }
2731         case XPT_DEV_MATCH:
2732         {
2733                 dev_pos_type position_type;
2734                 struct ccb_dev_match *cdm;
2735
2736                 cdm = &start_ccb->cdm;
2737
2738                 /*
2739                  * There are two ways of getting at information in the EDT.
2740                  * The first way is via the primary EDT tree.  It starts
2741                  * with a list of busses, then a list of targets on a bus,
2742                  * then devices/luns on a target, and then peripherals on a
2743                  * device/lun.  The "other" way is by the peripheral driver
2744                  * lists.  The peripheral driver lists are organized by
2745                  * peripheral driver.  (obviously)  So it makes sense to
2746                  * use the peripheral driver list if the user is looking
2747                  * for something like "da1", or all "da" devices.  If the
2748                  * user is looking for something on a particular bus/target
2749                  * or lun, it's generally better to go through the EDT tree.
2750                  */
2751
2752                 if (cdm->pos.position_type != CAM_DEV_POS_NONE)
2753                         position_type = cdm->pos.position_type;
2754                 else {
2755                         u_int i;
2756
2757                         position_type = CAM_DEV_POS_NONE;
2758
2759                         for (i = 0; i < cdm->num_patterns; i++) {
2760                                 if ((cdm->patterns[i].type == DEV_MATCH_BUS)
2761                                  ||(cdm->patterns[i].type == DEV_MATCH_DEVICE)){
2762                                         position_type = CAM_DEV_POS_EDT;
2763                                         break;
2764                                 }
2765                         }
2766
2767                         if (cdm->num_patterns == 0)
2768                                 position_type = CAM_DEV_POS_EDT;
2769                         else if (position_type == CAM_DEV_POS_NONE)
2770                                 position_type = CAM_DEV_POS_PDRV;
2771                 }
2772
2773                 switch(position_type & CAM_DEV_POS_TYPEMASK) {
2774                 case CAM_DEV_POS_EDT:
2775                         xptedtmatch(cdm);
2776                         break;
2777                 case CAM_DEV_POS_PDRV:
2778                         xptperiphlistmatch(cdm);
2779                         break;
2780                 default:
2781                         cdm->status = CAM_DEV_MATCH_ERROR;
2782                         break;
2783                 }
2784
2785                 if (cdm->status == CAM_DEV_MATCH_ERROR)
2786                         start_ccb->ccb_h.status = CAM_REQ_CMP_ERR;
2787                 else
2788                         start_ccb->ccb_h.status = CAM_REQ_CMP;
2789
2790                 break;
2791         }
2792         case XPT_SASYNC_CB:
2793         {
2794                 struct ccb_setasync *csa;
2795                 struct async_node *cur_entry;
2796                 struct async_list *async_head;
2797                 u_int32_t added;
2798
2799                 csa = &start_ccb->csa;
2800                 added = csa->event_enable;
2801                 async_head = &path->device->asyncs;
2802
2803                 /*
2804                  * If there is already an entry for us, simply
2805                  * update it.
2806                  */
2807                 cur_entry = SLIST_FIRST(async_head);
2808                 while (cur_entry != NULL) {
2809                         if ((cur_entry->callback_arg == csa->callback_arg)
2810                          && (cur_entry->callback == csa->callback))
2811                                 break;
2812                         cur_entry = SLIST_NEXT(cur_entry, links);
2813                 }
2814
2815                 if (cur_entry != NULL) {
2816                         /*
2817                          * If the request has no flags set,
2818                          * remove the entry.
2819                          */
2820                         added &= ~cur_entry->event_enable;
2821                         if (csa->event_enable == 0) {
2822                                 SLIST_REMOVE(async_head, cur_entry,
2823                                              async_node, links);
2824                                 xpt_release_device(path->device);
2825                                 free(cur_entry, M_CAMXPT);
2826                         } else {
2827                                 cur_entry->event_enable = csa->event_enable;
2828                         }
2829                         csa->event_enable = added;
2830                 } else {
2831                         cur_entry = malloc(sizeof(*cur_entry), M_CAMXPT,
2832                                            M_NOWAIT);
2833                         if (cur_entry == NULL) {
2834                                 csa->ccb_h.status = CAM_RESRC_UNAVAIL;
2835                                 break;
2836                         }
2837                         cur_entry->event_enable = csa->event_enable;
2838                         cur_entry->event_lock =
2839                             mtx_owned(path->bus->sim->mtx) ? 1 : 0;
2840                         cur_entry->callback_arg = csa->callback_arg;
2841                         cur_entry->callback = csa->callback;
2842                         SLIST_INSERT_HEAD(async_head, cur_entry, links);
2843                         xpt_acquire_device(path->device);
2844                 }
2845                 start_ccb->ccb_h.status = CAM_REQ_CMP;
2846                 break;
2847         }
2848         case XPT_REL_SIMQ:
2849         {
2850                 struct ccb_relsim *crs;
2851                 struct cam_ed *dev;
2852
2853                 crs = &start_ccb->crs;
2854                 dev = path->device;
2855                 if (dev == NULL) {
2856
2857                         crs->ccb_h.status = CAM_DEV_NOT_THERE;
2858                         break;
2859                 }
2860
2861                 if ((crs->release_flags & RELSIM_ADJUST_OPENINGS) != 0) {
2862
2863                         /* Don't ever go below one opening */
2864                         if (crs->openings > 0) {
2865                                 xpt_dev_ccbq_resize(path, crs->openings);
2866                                 if (bootverbose) {
2867                                         xpt_print(path,
2868                                             "number of openings is now %d\n",
2869                                             crs->openings);
2870                                 }
2871                         }
2872                 }
2873
2874                 mtx_lock(&dev->sim->devq->send_mtx);
2875                 if ((crs->release_flags & RELSIM_RELEASE_AFTER_TIMEOUT) != 0) {
2876
2877                         if ((dev->flags & CAM_DEV_REL_TIMEOUT_PENDING) != 0) {
2878
2879                                 /*
2880                                  * Just extend the old timeout and decrement
2881                                  * the freeze count so that a single timeout
2882                                  * is sufficient for releasing the queue.
2883                                  */
2884                                 start_ccb->ccb_h.flags &= ~CAM_DEV_QFREEZE;
2885                                 callout_stop(&dev->callout);
2886                         } else {
2887
2888                                 start_ccb->ccb_h.flags |= CAM_DEV_QFREEZE;
2889                         }
2890
2891                         callout_reset(&dev->callout,
2892                             (crs->release_timeout * hz) / 1000,
2893                             xpt_release_devq_timeout, dev);
2894
2895                         dev->flags |= CAM_DEV_REL_TIMEOUT_PENDING;
2896
2897                 }
2898
2899                 if ((crs->release_flags & RELSIM_RELEASE_AFTER_CMDCMPLT) != 0) {
2900
2901                         if ((dev->flags & CAM_DEV_REL_ON_COMPLETE) != 0) {
2902                                 /*
2903                                  * Decrement the freeze count so that a single
2904                                  * completion is still sufficient to unfreeze
2905                                  * the queue.
2906                                  */
2907                                 start_ccb->ccb_h.flags &= ~CAM_DEV_QFREEZE;
2908                         } else {
2909
2910                                 dev->flags |= CAM_DEV_REL_ON_COMPLETE;
2911                                 start_ccb->ccb_h.flags |= CAM_DEV_QFREEZE;
2912                         }
2913                 }
2914
2915                 if ((crs->release_flags & RELSIM_RELEASE_AFTER_QEMPTY) != 0) {
2916
2917                         if ((dev->flags & CAM_DEV_REL_ON_QUEUE_EMPTY) != 0
2918                          || (dev->ccbq.dev_active == 0)) {
2919
2920                                 start_ccb->ccb_h.flags &= ~CAM_DEV_QFREEZE;
2921                         } else {
2922
2923                                 dev->flags |= CAM_DEV_REL_ON_QUEUE_EMPTY;
2924                                 start_ccb->ccb_h.flags |= CAM_DEV_QFREEZE;
2925                         }
2926                 }
2927                 mtx_unlock(&dev->sim->devq->send_mtx);
2928
2929                 if ((start_ccb->ccb_h.flags & CAM_DEV_QFREEZE) == 0)
2930                         xpt_release_devq(path, /*count*/1, /*run_queue*/TRUE);
2931                 start_ccb->crs.qfrozen_cnt = dev->ccbq.queue.qfrozen_cnt;
2932                 start_ccb->ccb_h.status = CAM_REQ_CMP;
2933                 break;
2934         }
2935         case XPT_DEBUG: {
2936                 struct cam_path *oldpath;
2937
2938                 /* Check that all request bits are supported. */
2939                 if (start_ccb->cdbg.flags & ~(CAM_DEBUG_COMPILE)) {
2940                         start_ccb->ccb_h.status = CAM_FUNC_NOTAVAIL;
2941                         break;
2942                 }
2943
2944                 cam_dflags = CAM_DEBUG_NONE;
2945                 if (cam_dpath != NULL) {
2946                         oldpath = cam_dpath;
2947                         cam_dpath = NULL;
2948                         xpt_free_path(oldpath);
2949                 }
2950                 if (start_ccb->cdbg.flags != CAM_DEBUG_NONE) {
2951                         if (xpt_create_path(&cam_dpath, NULL,
2952                                             start_ccb->ccb_h.path_id,
2953                                             start_ccb->ccb_h.target_id,
2954                                             start_ccb->ccb_h.target_lun) !=
2955                                             CAM_REQ_CMP) {
2956                                 start_ccb->ccb_h.status = CAM_RESRC_UNAVAIL;
2957                         } else {
2958                                 cam_dflags = start_ccb->cdbg.flags;
2959                                 start_ccb->ccb_h.status = CAM_REQ_CMP;
2960                                 xpt_print(cam_dpath, "debugging flags now %x\n",
2961                                     cam_dflags);
2962                         }
2963                 } else
2964                         start_ccb->ccb_h.status = CAM_REQ_CMP;
2965                 break;
2966         }
2967         case XPT_NOOP:
2968                 if ((start_ccb->ccb_h.flags & CAM_DEV_QFREEZE) != 0)
2969                         xpt_freeze_devq(path, 1);
2970                 start_ccb->ccb_h.status = CAM_REQ_CMP;
2971                 break;
2972         default:
2973         case XPT_SDEV_TYPE:
2974         case XPT_TERM_IO:
2975         case XPT_ENG_INQ:
2976                 /* XXX Implement */
2977                 printf("%s: CCB type %#x not supported\n", __func__,
2978                        start_ccb->ccb_h.func_code);
2979                 start_ccb->ccb_h.status = CAM_PROVIDE_FAIL;
2980                 if (start_ccb->ccb_h.func_code & XPT_FC_DEV_QUEUED) {
2981                         xpt_done(start_ccb);
2982                 }
2983                 break;
2984         }
2985 }
2986
2987 void
2988 xpt_polled_action(union ccb *start_ccb)
2989 {
2990         u_int32_t timeout;
2991         struct    cam_sim *sim;
2992         struct    cam_devq *devq;
2993         struct    cam_ed *dev;
2994
2995         timeout = start_ccb->ccb_h.timeout * 10;
2996         sim = start_ccb->ccb_h.path->bus->sim;
2997         devq = sim->devq;
2998         dev = start_ccb->ccb_h.path->device;
2999
3000         mtx_unlock(&dev->device_mtx);
3001
3002         /*
3003          * Steal an opening so that no other queued requests
3004          * can get it before us while we simulate interrupts.
3005          */
3006         mtx_lock(&devq->send_mtx);
3007         dev->ccbq.devq_openings--;
3008         dev->ccbq.dev_openings--;
3009         while((devq->send_openings <= 0 || dev->ccbq.dev_openings < 0) &&
3010             (--timeout > 0)) {
3011                 mtx_unlock(&devq->send_mtx);
3012                 DELAY(100);
3013                 CAM_SIM_LOCK(sim);
3014                 (*(sim->sim_poll))(sim);
3015                 CAM_SIM_UNLOCK(sim);
3016                 camisr_runqueue();
3017                 mtx_lock(&devq->send_mtx);
3018         }
3019         dev->ccbq.devq_openings++;
3020         dev->ccbq.dev_openings++;
3021         mtx_unlock(&devq->send_mtx);
3022
3023         if (timeout != 0) {
3024                 xpt_action(start_ccb);
3025                 while(--timeout > 0) {
3026                         CAM_SIM_LOCK(sim);
3027                         (*(sim->sim_poll))(sim);
3028                         CAM_SIM_UNLOCK(sim);
3029                         camisr_runqueue();
3030                         if ((start_ccb->ccb_h.status  & CAM_STATUS_MASK)
3031                             != CAM_REQ_INPROG)
3032                                 break;
3033                         DELAY(100);
3034                 }
3035                 if (timeout == 0) {
3036                         /*
3037                          * XXX Is it worth adding a sim_timeout entry
3038                          * point so we can attempt recovery?  If
3039                          * this is only used for dumps, I don't think
3040                          * it is.
3041                          */
3042                         start_ccb->ccb_h.status = CAM_CMD_TIMEOUT;
3043                 }
3044         } else {
3045                 start_ccb->ccb_h.status = CAM_RESRC_UNAVAIL;
3046         }
3047
3048         mtx_lock(&dev->device_mtx);
3049 }
3050
3051 /*
3052  * Schedule a peripheral driver to receive a ccb when it's
3053  * target device has space for more transactions.
3054  */
3055 void
3056 xpt_schedule(struct cam_periph *periph, u_int32_t new_priority)
3057 {
3058
3059         CAM_DEBUG(periph->path, CAM_DEBUG_TRACE, ("xpt_schedule\n"));
3060         cam_periph_assert(periph, MA_OWNED);
3061         if (new_priority < periph->scheduled_priority) {
3062                 periph->scheduled_priority = new_priority;
3063                 xpt_run_allocq(periph, 0);
3064         }
3065 }
3066
3067
3068 /*
3069  * Schedule a device to run on a given queue.
3070  * If the device was inserted as a new entry on the queue,
3071  * return 1 meaning the device queue should be run. If we
3072  * were already queued, implying someone else has already
3073  * started the queue, return 0 so the caller doesn't attempt
3074  * to run the queue.
3075  */
3076 static int
3077 xpt_schedule_dev(struct camq *queue, cam_pinfo *pinfo,
3078                  u_int32_t new_priority)
3079 {
3080         int retval;
3081         u_int32_t old_priority;
3082
3083         CAM_DEBUG_PRINT(CAM_DEBUG_XPT, ("xpt_schedule_dev\n"));
3084
3085         old_priority = pinfo->priority;
3086
3087         /*
3088          * Are we already queued?
3089          */
3090         if (pinfo->index != CAM_UNQUEUED_INDEX) {
3091                 /* Simply reorder based on new priority */
3092                 if (new_priority < old_priority) {
3093                         camq_change_priority(queue, pinfo->index,
3094                                              new_priority);
3095                         CAM_DEBUG_PRINT(CAM_DEBUG_XPT,
3096                                         ("changed priority to %d\n",
3097                                          new_priority));
3098                         retval = 1;
3099                 } else
3100                         retval = 0;
3101         } else {
3102                 /* New entry on the queue */
3103                 if (new_priority < old_priority)
3104                         pinfo->priority = new_priority;
3105
3106                 CAM_DEBUG_PRINT(CAM_DEBUG_XPT,
3107                                 ("Inserting onto queue\n"));
3108                 pinfo->generation = ++queue->generation;
3109                 camq_insert(queue, pinfo);
3110                 retval = 1;
3111         }
3112         return (retval);
3113 }
3114
3115 static void
3116 xpt_run_allocq_task(void *context, int pending)
3117 {
3118         struct cam_periph *periph = context;
3119
3120         cam_periph_lock(periph);
3121         periph->flags &= ~CAM_PERIPH_RUN_TASK;
3122         xpt_run_allocq(periph, 1);
3123         cam_periph_unlock(periph);
3124         cam_periph_release(periph);
3125 }
3126
3127 static void
3128 xpt_run_allocq(struct cam_periph *periph, int sleep)
3129 {
3130         struct cam_ed   *device;
3131         union ccb       *ccb;
3132         uint32_t         prio;
3133
3134         cam_periph_assert(periph, MA_OWNED);
3135         if (periph->periph_allocating)
3136                 return;
3137         periph->periph_allocating = 1;
3138         CAM_DEBUG_PRINT(CAM_DEBUG_XPT, ("xpt_run_allocq(%p)\n", periph));
3139         device = periph->path->device;
3140         ccb = NULL;
3141 restart:
3142         while ((prio = min(periph->scheduled_priority,
3143             periph->immediate_priority)) != CAM_PRIORITY_NONE &&
3144             (periph->periph_allocated - (ccb != NULL ? 1 : 0) <
3145              device->ccbq.total_openings || prio <= CAM_PRIORITY_OOB)) {
3146
3147                 if (ccb == NULL &&
3148                     (ccb = xpt_get_ccb_nowait(periph)) == NULL) {
3149                         if (sleep) {
3150                                 ccb = xpt_get_ccb(periph);
3151                                 goto restart;
3152                         }
3153                         if (periph->flags & CAM_PERIPH_RUN_TASK)
3154                                 break;
3155                         cam_periph_doacquire(periph);
3156                         periph->flags |= CAM_PERIPH_RUN_TASK;
3157                         taskqueue_enqueue(xsoftc.xpt_taskq,
3158                             &periph->periph_run_task);
3159                         break;
3160                 }
3161                 xpt_setup_ccb(&ccb->ccb_h, periph->path, prio);
3162                 if (prio == periph->immediate_priority) {
3163                         periph->immediate_priority = CAM_PRIORITY_NONE;
3164                         CAM_DEBUG_PRINT(CAM_DEBUG_XPT,
3165                                         ("waking cam_periph_getccb()\n"));
3166                         SLIST_INSERT_HEAD(&periph->ccb_list, &ccb->ccb_h,
3167                                           periph_links.sle);
3168                         wakeup(&periph->ccb_list);
3169                 } else {
3170                         periph->scheduled_priority = CAM_PRIORITY_NONE;
3171                         CAM_DEBUG_PRINT(CAM_DEBUG_XPT,
3172                                         ("calling periph_start()\n"));
3173                         periph->periph_start(periph, ccb);
3174                 }
3175                 ccb = NULL;
3176         }
3177         if (ccb != NULL)
3178                 xpt_release_ccb(ccb);
3179         periph->periph_allocating = 0;
3180 }
3181
3182 static void
3183 xpt_run_devq(struct cam_devq *devq)
3184 {
3185         char cdb_str[(SCSI_MAX_CDBLEN * 3) + 1];
3186         int lock;
3187
3188         CAM_DEBUG_PRINT(CAM_DEBUG_XPT, ("xpt_run_devq\n"));
3189
3190         devq->send_queue.qfrozen_cnt++;
3191         while ((devq->send_queue.entries > 0)
3192             && (devq->send_openings > 0)
3193             && (devq->send_queue.qfrozen_cnt <= 1)) {
3194                 struct  cam_ed *device;
3195                 union ccb *work_ccb;
3196                 struct  cam_sim *sim;
3197
3198                 device = (struct cam_ed *)camq_remove(&devq->send_queue,
3199                                                            CAMQ_HEAD);
3200                 CAM_DEBUG_PRINT(CAM_DEBUG_XPT,
3201                                 ("running device %p\n", device));
3202
3203                 work_ccb = cam_ccbq_peek_ccb(&device->ccbq, CAMQ_HEAD);
3204                 if (work_ccb == NULL) {
3205                         printf("device on run queue with no ccbs???\n");
3206                         continue;
3207                 }
3208
3209                 if ((work_ccb->ccb_h.flags & CAM_HIGH_POWER) != 0) {
3210
3211                         mtx_lock(&xsoftc.xpt_highpower_lock);
3212                         if (xsoftc.num_highpower <= 0) {
3213                                 /*
3214                                  * We got a high power command, but we
3215                                  * don't have any available slots.  Freeze
3216                                  * the device queue until we have a slot
3217                                  * available.
3218                                  */
3219                                 xpt_freeze_devq_device(device, 1);
3220                                 STAILQ_INSERT_TAIL(&xsoftc.highpowerq, device,
3221                                                    highpowerq_entry);
3222
3223                                 mtx_unlock(&xsoftc.xpt_highpower_lock);
3224                                 continue;
3225                         } else {
3226                                 /*
3227                                  * Consume a high power slot while
3228                                  * this ccb runs.
3229                                  */
3230                                 xsoftc.num_highpower--;
3231                         }
3232                         mtx_unlock(&xsoftc.xpt_highpower_lock);
3233                 }
3234                 cam_ccbq_remove_ccb(&device->ccbq, work_ccb);
3235                 cam_ccbq_send_ccb(&device->ccbq, work_ccb);
3236                 devq->send_openings--;
3237                 devq->send_active++;
3238                 xpt_schedule_devq(devq, device);
3239                 mtx_unlock(&devq->send_mtx);
3240
3241                 if ((work_ccb->ccb_h.flags & CAM_DEV_QFREEZE) != 0) {
3242                         /*
3243                          * The client wants to freeze the queue
3244                          * after this CCB is sent.
3245                          */
3246                         xpt_freeze_devq(work_ccb->ccb_h.path, 1);
3247                 }
3248
3249                 /* In Target mode, the peripheral driver knows best... */
3250                 if (work_ccb->ccb_h.func_code == XPT_SCSI_IO) {
3251                         if ((device->inq_flags & SID_CmdQue) != 0
3252                          && work_ccb->csio.tag_action != CAM_TAG_ACTION_NONE)
3253                                 work_ccb->ccb_h.flags |= CAM_TAG_ACTION_VALID;
3254                         else
3255                                 /*
3256                                  * Clear this in case of a retried CCB that
3257                                  * failed due to a rejected tag.
3258                                  */
3259                                 work_ccb->ccb_h.flags &= ~CAM_TAG_ACTION_VALID;
3260                 }
3261
3262                 switch (work_ccb->ccb_h.func_code) {
3263                 case XPT_SCSI_IO:
3264                         CAM_DEBUG(work_ccb->ccb_h.path,
3265                             CAM_DEBUG_CDB,("%s. CDB: %s\n",
3266                              scsi_op_desc(work_ccb->csio.cdb_io.cdb_bytes[0],
3267                                           &device->inq_data),
3268                              scsi_cdb_string(work_ccb->csio.cdb_io.cdb_bytes,
3269                                              cdb_str, sizeof(cdb_str))));
3270                         break;
3271                 case XPT_ATA_IO:
3272                         CAM_DEBUG(work_ccb->ccb_h.path,
3273                             CAM_DEBUG_CDB,("%s. ACB: %s\n",
3274                              ata_op_string(&work_ccb->ataio.cmd),
3275                              ata_cmd_string(&work_ccb->ataio.cmd,
3276                                             cdb_str, sizeof(cdb_str))));
3277                         break;
3278                 default:
3279                         break;
3280                 }
3281
3282                 /*
3283                  * Device queues can be shared among multiple SIM instances
3284                  * that reside on different busses.  Use the SIM from the
3285                  * queued device, rather than the one from the calling bus.
3286                  */
3287                 sim = device->sim;
3288                 lock = (mtx_owned(sim->mtx) == 0);
3289                 if (lock)
3290                         CAM_SIM_LOCK(sim);
3291                 (*(sim->sim_action))(sim, work_ccb);
3292                 if (lock)
3293                         CAM_SIM_UNLOCK(sim);
3294                 mtx_lock(&devq->send_mtx);
3295         }
3296         devq->send_queue.qfrozen_cnt--;
3297 }
3298
3299 /*
3300  * This function merges stuff from the slave ccb into the master ccb, while
3301  * keeping important fields in the master ccb constant.
3302  */
3303 void
3304 xpt_merge_ccb(union ccb *master_ccb, union ccb *slave_ccb)
3305 {
3306
3307         /*
3308          * Pull fields that are valid for peripheral drivers to set
3309          * into the master CCB along with the CCB "payload".
3310          */
3311         master_ccb->ccb_h.retry_count = slave_ccb->ccb_h.retry_count;
3312         master_ccb->ccb_h.func_code = slave_ccb->ccb_h.func_code;
3313         master_ccb->ccb_h.timeout = slave_ccb->ccb_h.timeout;
3314         master_ccb->ccb_h.flags = slave_ccb->ccb_h.flags;
3315         bcopy(&(&slave_ccb->ccb_h)[1], &(&master_ccb->ccb_h)[1],
3316               sizeof(union ccb) - sizeof(struct ccb_hdr));
3317 }
3318
3319 void
3320 xpt_setup_ccb(struct ccb_hdr *ccb_h, struct cam_path *path, u_int32_t priority)
3321 {
3322
3323         CAM_DEBUG(path, CAM_DEBUG_TRACE, ("xpt_setup_ccb\n"));
3324         ccb_h->pinfo.priority = priority;
3325         ccb_h->path = path;
3326         ccb_h->path_id = path->bus->path_id;
3327         if (path->target)
3328                 ccb_h->target_id = path->target->target_id;
3329         else
3330                 ccb_h->target_id = CAM_TARGET_WILDCARD;
3331         if (path->device) {
3332                 ccb_h->target_lun = path->device->lun_id;
3333                 ccb_h->pinfo.generation = ++path->device->ccbq.queue.generation;
3334         } else {
3335                 ccb_h->target_lun = CAM_TARGET_WILDCARD;
3336         }
3337         ccb_h->pinfo.index = CAM_UNQUEUED_INDEX;
3338         ccb_h->flags = 0;
3339         ccb_h->xflags = 0;
3340 }
3341
3342 /* Path manipulation functions */
3343 cam_status
3344 xpt_create_path(struct cam_path **new_path_ptr, struct cam_periph *perph,
3345                 path_id_t path_id, target_id_t target_id, lun_id_t lun_id)
3346 {
3347         struct     cam_path *path;
3348         cam_status status;
3349
3350         path = (struct cam_path *)malloc(sizeof(*path), M_CAMPATH, M_NOWAIT);
3351
3352         if (path == NULL) {
3353                 status = CAM_RESRC_UNAVAIL;
3354                 return(status);
3355         }
3356         status = xpt_compile_path(path, perph, path_id, target_id, lun_id);
3357         if (status != CAM_REQ_CMP) {
3358                 free(path, M_CAMPATH);
3359                 path = NULL;
3360         }
3361         *new_path_ptr = path;
3362         return (status);
3363 }
3364
3365 cam_status
3366 xpt_create_path_unlocked(struct cam_path **new_path_ptr,
3367                          struct cam_periph *periph, path_id_t path_id,
3368                          target_id_t target_id, lun_id_t lun_id)
3369 {
3370
3371         return (xpt_create_path(new_path_ptr, periph, path_id, target_id,
3372             lun_id));
3373 }
3374
3375 cam_status
3376 xpt_compile_path(struct cam_path *new_path, struct cam_periph *perph,
3377                  path_id_t path_id, target_id_t target_id, lun_id_t lun_id)
3378 {
3379         struct       cam_eb *bus;
3380         struct       cam_et *target;
3381         struct       cam_ed *device;
3382         cam_status   status;
3383
3384         status = CAM_REQ_CMP;   /* Completed without error */
3385         target = NULL;          /* Wildcarded */
3386         device = NULL;          /* Wildcarded */
3387
3388         /*
3389          * We will potentially modify the EDT, so block interrupts
3390          * that may attempt to create cam paths.
3391          */
3392         bus = xpt_find_bus(path_id);
3393         if (bus == NULL) {
3394                 status = CAM_PATH_INVALID;
3395         } else {
3396                 xpt_lock_buses();
3397                 mtx_lock(&bus->eb_mtx);
3398                 target = xpt_find_target(bus, target_id);
3399                 if (target == NULL) {
3400                         /* Create one */
3401                         struct cam_et *new_target;
3402
3403                         new_target = xpt_alloc_target(bus, target_id);
3404                         if (new_target == NULL) {
3405                                 status = CAM_RESRC_UNAVAIL;
3406                         } else {
3407                                 target = new_target;
3408                         }
3409                 }
3410                 xpt_unlock_buses();
3411                 if (target != NULL) {
3412                         device = xpt_find_device(target, lun_id);
3413                         if (device == NULL) {
3414                                 /* Create one */
3415                                 struct cam_ed *new_device;
3416
3417                                 new_device =
3418                                     (*(bus->xport->alloc_device))(bus,
3419                                                                       target,
3420                                                                       lun_id);
3421                                 if (new_device == NULL) {
3422                                         status = CAM_RESRC_UNAVAIL;
3423                                 } else {
3424                                         device = new_device;
3425                                 }
3426                         }
3427                 }
3428                 mtx_unlock(&bus->eb_mtx);
3429         }
3430
3431         /*
3432          * Only touch the user's data if we are successful.
3433          */
3434         if (status == CAM_REQ_CMP) {
3435                 new_path->periph = perph;
3436                 new_path->bus = bus;
3437                 new_path->target = target;
3438                 new_path->device = device;
3439                 CAM_DEBUG(new_path, CAM_DEBUG_TRACE, ("xpt_compile_path\n"));
3440         } else {
3441                 if (device != NULL)
3442                         xpt_release_device(device);
3443                 if (target != NULL)
3444                         xpt_release_target(target);
3445                 if (bus != NULL)
3446                         xpt_release_bus(bus);
3447         }
3448         return (status);
3449 }
3450
3451 cam_status
3452 xpt_clone_path(struct cam_path **new_path_ptr, struct cam_path *path)
3453 {
3454         struct     cam_path *new_path;
3455
3456         new_path = (struct cam_path *)malloc(sizeof(*path), M_CAMPATH, M_NOWAIT);
3457         if (new_path == NULL)
3458                 return(CAM_RESRC_UNAVAIL);
3459         xpt_copy_path(new_path, path);
3460         *new_path_ptr = new_path;
3461         return (CAM_REQ_CMP);
3462 }
3463
3464 void
3465 xpt_copy_path(struct cam_path *new_path, struct cam_path *path)
3466 {
3467
3468         *new_path = *path;
3469         if (path->bus != NULL)
3470                 xpt_acquire_bus(path->bus);
3471         if (path->target != NULL)
3472                 xpt_acquire_target(path->target);
3473         if (path->device != NULL)
3474                 xpt_acquire_device(path->device);
3475 }
3476
3477 void
3478 xpt_release_path(struct cam_path *path)
3479 {
3480         CAM_DEBUG(path, CAM_DEBUG_TRACE, ("xpt_release_path\n"));
3481         if (path->device != NULL) {
3482                 xpt_release_device(path->device);
3483                 path->device = NULL;
3484         }
3485         if (path->target != NULL) {
3486                 xpt_release_target(path->target);
3487                 path->target = NULL;
3488         }
3489         if (path->bus != NULL) {
3490                 xpt_release_bus(path->bus);
3491                 path->bus = NULL;
3492         }
3493 }
3494
3495 void
3496 xpt_free_path(struct cam_path *path)
3497 {
3498
3499         CAM_DEBUG(path, CAM_DEBUG_TRACE, ("xpt_free_path\n"));
3500         xpt_release_path(path);
3501         free(path, M_CAMPATH);
3502 }
3503
3504 void
3505 xpt_path_counts(struct cam_path *path, uint32_t *bus_ref,
3506     uint32_t *periph_ref, uint32_t *target_ref, uint32_t *device_ref)
3507 {
3508
3509         xpt_lock_buses();
3510         if (bus_ref) {
3511                 if (path->bus)
3512                         *bus_ref = path->bus->refcount;
3513                 else
3514                         *bus_ref = 0;
3515         }
3516         if (periph_ref) {
3517                 if (path->periph)
3518                         *periph_ref = path->periph->refcount;
3519                 else
3520                         *periph_ref = 0;
3521         }
3522         xpt_unlock_buses();
3523         if (target_ref) {
3524                 if (path->target)
3525                         *target_ref = path->target->refcount;
3526                 else
3527                         *target_ref = 0;
3528         }
3529         if (device_ref) {
3530                 if (path->device)
3531                         *device_ref = path->device->refcount;
3532                 else
3533                         *device_ref = 0;
3534         }
3535 }
3536
3537 /*
3538  * Return -1 for failure, 0 for exact match, 1 for match with wildcards
3539  * in path1, 2 for match with wildcards in path2.
3540  */
3541 int
3542 xpt_path_comp(struct cam_path *path1, struct cam_path *path2)
3543 {
3544         int retval = 0;
3545
3546         if (path1->bus != path2->bus) {
3547                 if (path1->bus->path_id == CAM_BUS_WILDCARD)
3548                         retval = 1;
3549                 else if (path2->bus->path_id == CAM_BUS_WILDCARD)
3550                         retval = 2;
3551                 else
3552                         return (-1);
3553         }
3554         if (path1->target != path2->target) {
3555                 if (path1->target->target_id == CAM_TARGET_WILDCARD) {
3556                         if (retval == 0)
3557                                 retval = 1;
3558                 } else if (path2->target->target_id == CAM_TARGET_WILDCARD)
3559                         retval = 2;
3560                 else
3561                         return (-1);
3562         }
3563         if (path1->device != path2->device) {
3564                 if (path1->device->lun_id == CAM_LUN_WILDCARD) {
3565                         if (retval == 0)
3566                                 retval = 1;
3567                 } else if (path2->device->lun_id == CAM_LUN_WILDCARD)
3568                         retval = 2;
3569                 else
3570                         return (-1);
3571         }
3572         return (retval);
3573 }
3574
3575 int
3576 xpt_path_comp_dev(struct cam_path *path, struct cam_ed *dev)
3577 {
3578         int retval = 0;
3579
3580         if (path->bus != dev->target->bus) {
3581                 if (path->bus->path_id == CAM_BUS_WILDCARD)
3582                         retval = 1;
3583                 else if (dev->target->bus->path_id == CAM_BUS_WILDCARD)
3584                         retval = 2;
3585                 else
3586                         return (-1);
3587         }
3588         if (path->target != dev->target) {
3589                 if (path->target->target_id == CAM_TARGET_WILDCARD) {
3590                         if (retval == 0)
3591                                 retval = 1;
3592                 } else if (dev->target->target_id == CAM_TARGET_WILDCARD)
3593                         retval = 2;
3594                 else
3595                         return (-1);
3596         }
3597         if (path->device != dev) {
3598                 if (path->device->lun_id == CAM_LUN_WILDCARD) {
3599                         if (retval == 0)
3600                                 retval = 1;
3601                 } else if (dev->lun_id == CAM_LUN_WILDCARD)
3602                         retval = 2;
3603                 else
3604                         return (-1);
3605         }
3606         return (retval);
3607 }
3608
3609 void
3610 xpt_print_path(struct cam_path *path)
3611 {
3612
3613         if (path == NULL)
3614                 printf("(nopath): ");
3615         else {
3616                 if (path->periph != NULL)
3617                         printf("(%s%d:", path->periph->periph_name,
3618                                path->periph->unit_number);
3619                 else
3620                         printf("(noperiph:");
3621
3622                 if (path->bus != NULL)
3623                         printf("%s%d:%d:", path->bus->sim->sim_name,
3624                                path->bus->sim->unit_number,
3625                                path->bus->sim->bus_id);
3626                 else
3627                         printf("nobus:");
3628
3629                 if (path->target != NULL)
3630                         printf("%d:", path->target->target_id);
3631                 else
3632                         printf("X:");
3633
3634                 if (path->device != NULL)
3635                         printf("%jx): ", (uintmax_t)path->device->lun_id);
3636                 else
3637                         printf("X): ");
3638         }
3639 }
3640
3641 void
3642 xpt_print_device(struct cam_ed *device)
3643 {
3644
3645         if (device == NULL)
3646                 printf("(nopath): ");
3647         else {
3648                 printf("(noperiph:%s%d:%d:%d:%jx): ", device->sim->sim_name,
3649                        device->sim->unit_number,
3650                        device->sim->bus_id,
3651                        device->target->target_id,
3652                        (uintmax_t)device->lun_id);
3653         }
3654 }
3655
3656 void
3657 xpt_print(struct cam_path *path, const char *fmt, ...)
3658 {
3659         va_list ap;
3660         xpt_print_path(path);
3661         va_start(ap, fmt);
3662         vprintf(fmt, ap);
3663         va_end(ap);
3664 }
3665
3666 int
3667 xpt_path_string(struct cam_path *path, char *str, size_t str_len)
3668 {
3669         struct sbuf sb;
3670
3671         sbuf_new(&sb, str, str_len, 0);
3672
3673         if (path == NULL)
3674                 sbuf_printf(&sb, "(nopath): ");
3675         else {
3676                 if (path->periph != NULL)
3677                         sbuf_printf(&sb, "(%s%d:", path->periph->periph_name,
3678                                     path->periph->unit_number);
3679                 else
3680                         sbuf_printf(&sb, "(noperiph:");
3681
3682                 if (path->bus != NULL)
3683                         sbuf_printf(&sb, "%s%d:%d:", path->bus->sim->sim_name,
3684                                     path->bus->sim->unit_number,
3685                                     path->bus->sim->bus_id);
3686                 else
3687                         sbuf_printf(&sb, "nobus:");
3688
3689                 if (path->target != NULL)
3690                         sbuf_printf(&sb, "%d:", path->target->target_id);
3691                 else
3692                         sbuf_printf(&sb, "X:");
3693
3694                 if (path->device != NULL)
3695                         sbuf_printf(&sb, "%jx): ",
3696                             (uintmax_t)path->device->lun_id);
3697                 else
3698                         sbuf_printf(&sb, "X): ");
3699         }
3700         sbuf_finish(&sb);
3701
3702         return(sbuf_len(&sb));
3703 }
3704
3705 path_id_t
3706 xpt_path_path_id(struct cam_path *path)
3707 {
3708         return(path->bus->path_id);
3709 }
3710
3711 target_id_t
3712 xpt_path_target_id(struct cam_path *path)
3713 {
3714         if (path->target != NULL)
3715                 return (path->target->target_id);
3716         else
3717                 return (CAM_TARGET_WILDCARD);
3718 }
3719
3720 lun_id_t
3721 xpt_path_lun_id(struct cam_path *path)
3722 {
3723         if (path->device != NULL)
3724                 return (path->device->lun_id);
3725         else
3726                 return (CAM_LUN_WILDCARD);
3727 }
3728
3729 struct cam_sim *
3730 xpt_path_sim(struct cam_path *path)
3731 {
3732
3733         return (path->bus->sim);
3734 }
3735
3736 struct cam_periph*
3737 xpt_path_periph(struct cam_path *path)
3738 {
3739
3740         return (path->periph);
3741 }
3742
3743 int
3744 xpt_path_legacy_ata_id(struct cam_path *path)
3745 {
3746         struct cam_eb *bus;
3747         int bus_id;
3748
3749         if ((strcmp(path->bus->sim->sim_name, "ata") != 0) &&
3750             strcmp(path->bus->sim->sim_name, "ahcich") != 0 &&
3751             strcmp(path->bus->sim->sim_name, "mvsch") != 0 &&
3752             strcmp(path->bus->sim->sim_name, "siisch") != 0)
3753                 return (-1);
3754
3755         if (strcmp(path->bus->sim->sim_name, "ata") == 0 &&
3756             path->bus->sim->unit_number < 2) {
3757                 bus_id = path->bus->sim->unit_number;
3758         } else {
3759                 bus_id = 2;
3760                 xpt_lock_buses();
3761                 TAILQ_FOREACH(bus, &xsoftc.xpt_busses, links) {
3762                         if (bus == path->bus)
3763                                 break;
3764                         if ((strcmp(bus->sim->sim_name, "ata") == 0 &&
3765                              bus->sim->unit_number >= 2) ||
3766                             strcmp(bus->sim->sim_name, "ahcich") == 0 ||
3767                             strcmp(bus->sim->sim_name, "mvsch") == 0 ||
3768                             strcmp(bus->sim->sim_name, "siisch") == 0)
3769                                 bus_id++;
3770                 }
3771                 xpt_unlock_buses();
3772         }
3773         if (path->target != NULL) {
3774                 if (path->target->target_id < 2)
3775                         return (bus_id * 2 + path->target->target_id);
3776                 else
3777                         return (-1);
3778         } else
3779                 return (bus_id * 2);
3780 }
3781
3782 /*
3783  * Release a CAM control block for the caller.  Remit the cost of the structure
3784  * to the device referenced by the path.  If the this device had no 'credits'
3785  * and peripheral drivers have registered async callbacks for this notification
3786  * call them now.
3787  */
3788 void
3789 xpt_release_ccb(union ccb *free_ccb)
3790 {
3791         struct   cam_ed *device;
3792         struct   cam_periph *periph;
3793
3794         CAM_DEBUG_PRINT(CAM_DEBUG_XPT, ("xpt_release_ccb\n"));
3795         xpt_path_assert(free_ccb->ccb_h.path, MA_OWNED);
3796         device = free_ccb->ccb_h.path->device;
3797         periph = free_ccb->ccb_h.path->periph;
3798
3799         xpt_free_ccb(free_ccb);
3800         periph->periph_allocated--;
3801         cam_ccbq_release_opening(&device->ccbq);
3802         xpt_run_allocq(periph, 0);
3803 }
3804
3805 /* Functions accessed by SIM drivers */
3806
3807 static struct xpt_xport xport_default = {
3808         .alloc_device = xpt_alloc_device_default,
3809         .action = xpt_action_default,
3810         .async = xpt_dev_async_default,
3811 };
3812
3813 /*
3814  * A sim structure, listing the SIM entry points and instance
3815  * identification info is passed to xpt_bus_register to hook the SIM
3816  * into the CAM framework.  xpt_bus_register creates a cam_eb entry
3817  * for this new bus and places it in the array of busses and assigns
3818  * it a path_id.  The path_id may be influenced by "hard wiring"
3819  * information specified by the user.  Once interrupt services are
3820  * available, the bus will be probed.
3821  */
3822 int32_t
3823 xpt_bus_register(struct cam_sim *sim, device_t parent, u_int32_t bus)
3824 {
3825         struct cam_eb *new_bus;
3826         struct cam_eb *old_bus;
3827         struct ccb_pathinq cpi;
3828         struct cam_path *path;
3829         cam_status status;
3830
3831         mtx_assert(sim->mtx, MA_OWNED);
3832
3833         sim->bus_id = bus;
3834         new_bus = (struct cam_eb *)malloc(sizeof(*new_bus),
3835                                           M_CAMXPT, M_NOWAIT|M_ZERO);
3836         if (new_bus == NULL) {
3837                 /* Couldn't satisfy request */
3838                 return (CAM_RESRC_UNAVAIL);
3839         }
3840
3841         mtx_init(&new_bus->eb_mtx, "CAM bus lock", NULL, MTX_DEF);
3842         TAILQ_INIT(&new_bus->et_entries);
3843         cam_sim_hold(sim);
3844         new_bus->sim = sim;
3845         timevalclear(&new_bus->last_reset);
3846         new_bus->flags = 0;
3847         new_bus->refcount = 1;  /* Held until a bus_deregister event */
3848         new_bus->generation = 0;
3849
3850         xpt_lock_buses();
3851         sim->path_id = new_bus->path_id =
3852             xptpathid(sim->sim_name, sim->unit_number, sim->bus_id);
3853         old_bus = TAILQ_FIRST(&xsoftc.xpt_busses);
3854         while (old_bus != NULL
3855             && old_bus->path_id < new_bus->path_id)
3856                 old_bus = TAILQ_NEXT(old_bus, links);
3857         if (old_bus != NULL)
3858                 TAILQ_INSERT_BEFORE(old_bus, new_bus, links);
3859         else
3860                 TAILQ_INSERT_TAIL(&xsoftc.xpt_busses, new_bus, links);
3861         xsoftc.bus_generation++;
3862         xpt_unlock_buses();
3863
3864         /*
3865          * Set a default transport so that a PATH_INQ can be issued to
3866          * the SIM.  This will then allow for probing and attaching of
3867          * a more appropriate transport.
3868          */
3869         new_bus->xport = &xport_default;
3870
3871         status = xpt_create_path(&path, /*periph*/NULL, sim->path_id,
3872                                   CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD);
3873         if (status != CAM_REQ_CMP) {
3874                 xpt_release_bus(new_bus);
3875                 free(path, M_CAMXPT);
3876                 return (CAM_RESRC_UNAVAIL);
3877         }
3878
3879         xpt_setup_ccb(&cpi.ccb_h, path, CAM_PRIORITY_NORMAL);
3880         cpi.ccb_h.func_code = XPT_PATH_INQ;
3881         xpt_action((union ccb *)&cpi);
3882
3883         if (cpi.ccb_h.status == CAM_REQ_CMP) {
3884                 switch (cpi.transport) {
3885                 case XPORT_SPI:
3886                 case XPORT_SAS:
3887                 case XPORT_FC:
3888                 case XPORT_USB:
3889                 case XPORT_ISCSI:
3890                 case XPORT_SRP:
3891                 case XPORT_PPB:
3892                         new_bus->xport = scsi_get_xport();
3893                         break;
3894                 case XPORT_ATA:
3895                 case XPORT_SATA:
3896                         new_bus->xport = ata_get_xport();
3897                         break;
3898                 default:
3899                         new_bus->xport = &xport_default;
3900                         break;
3901                 }
3902         }
3903
3904         /* Notify interested parties */
3905         if (sim->path_id != CAM_XPT_PATH_ID) {
3906
3907                 xpt_async(AC_PATH_REGISTERED, path, &cpi);
3908                 if ((cpi.hba_misc & PIM_NOSCAN) == 0) {
3909                         union   ccb *scan_ccb;
3910
3911                         /* Initiate bus rescan. */
3912                         scan_ccb = xpt_alloc_ccb_nowait();
3913                         if (scan_ccb != NULL) {
3914                                 scan_ccb->ccb_h.path = path;
3915                                 scan_ccb->ccb_h.func_code = XPT_SCAN_BUS;
3916                                 scan_ccb->crcn.flags = 0;
3917                                 xpt_rescan(scan_ccb);
3918                         } else {
3919                                 xpt_print(path,
3920                                           "Can't allocate CCB to scan bus\n");
3921                                 xpt_free_path(path);
3922                         }
3923                 } else
3924                         xpt_free_path(path);
3925         } else
3926                 xpt_free_path(path);
3927         return (CAM_SUCCESS);
3928 }
3929
3930 int32_t
3931 xpt_bus_deregister(path_id_t pathid)
3932 {
3933         struct cam_path bus_path;
3934         cam_status status;
3935
3936         status = xpt_compile_path(&bus_path, NULL, pathid,
3937                                   CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD);
3938         if (status != CAM_REQ_CMP)
3939                 return (status);
3940
3941         xpt_async(AC_LOST_DEVICE, &bus_path, NULL);
3942         xpt_async(AC_PATH_DEREGISTERED, &bus_path, NULL);
3943
3944         /* Release the reference count held while registered. */
3945         xpt_release_bus(bus_path.bus);
3946         xpt_release_path(&bus_path);
3947
3948         return (CAM_REQ_CMP);
3949 }
3950
3951 static path_id_t
3952 xptnextfreepathid(void)
3953 {
3954         struct cam_eb *bus;
3955         path_id_t pathid;
3956         const char *strval;
3957
3958         mtx_assert(&xsoftc.xpt_topo_lock, MA_OWNED);
3959         pathid = 0;
3960         bus = TAILQ_FIRST(&xsoftc.xpt_busses);
3961 retry:
3962         /* Find an unoccupied pathid */
3963         while (bus != NULL && bus->path_id <= pathid) {
3964                 if (bus->path_id == pathid)
3965                         pathid++;
3966                 bus = TAILQ_NEXT(bus, links);
3967         }
3968
3969         /*
3970          * Ensure that this pathid is not reserved for
3971          * a bus that may be registered in the future.
3972          */
3973         if (resource_string_value("scbus", pathid, "at", &strval) == 0) {
3974                 ++pathid;
3975                 /* Start the search over */
3976                 goto retry;
3977         }
3978         return (pathid);
3979 }
3980
3981 static path_id_t
3982 xptpathid(const char *sim_name, int sim_unit, int sim_bus)
3983 {
3984         path_id_t pathid;
3985         int i, dunit, val;
3986         char buf[32];
3987         const char *dname;
3988
3989         pathid = CAM_XPT_PATH_ID;
3990         snprintf(buf, sizeof(buf), "%s%d", sim_name, sim_unit);
3991         if (strcmp(buf, "xpt0") == 0 && sim_bus == 0)
3992                 return (pathid);
3993         i = 0;
3994         while ((resource_find_match(&i, &dname, &dunit, "at", buf)) == 0) {
3995                 if (strcmp(dname, "scbus")) {
3996                         /* Avoid a bit of foot shooting. */
3997                         continue;
3998                 }
3999                 if (dunit < 0)          /* unwired?! */
4000                         continue;
4001                 if (resource_int_value("scbus", dunit, "bus", &val) == 0) {
4002                         if (sim_bus == val) {
4003                                 pathid = dunit;
4004                                 break;
4005                         }
4006                 } else if (sim_bus == 0) {
4007                         /* Unspecified matches bus 0 */
4008                         pathid = dunit;
4009                         break;
4010                 } else {
4011                         printf("Ambiguous scbus configuration for %s%d "
4012                                "bus %d, cannot wire down.  The kernel "
4013                                "config entry for scbus%d should "
4014                                "specify a controller bus.\n"
4015                                "Scbus will be assigned dynamically.\n",
4016                                sim_name, sim_unit, sim_bus, dunit);
4017                         break;
4018                 }
4019         }
4020
4021         if (pathid == CAM_XPT_PATH_ID)
4022                 pathid = xptnextfreepathid();
4023         return (pathid);
4024 }
4025
4026 static const char *
4027 xpt_async_string(u_int32_t async_code)
4028 {
4029
4030         switch (async_code) {
4031         case AC_BUS_RESET: return ("AC_BUS_RESET");
4032         case AC_UNSOL_RESEL: return ("AC_UNSOL_RESEL");
4033         case AC_SCSI_AEN: return ("AC_SCSI_AEN");
4034         case AC_SENT_BDR: return ("AC_SENT_BDR");
4035         case AC_PATH_REGISTERED: return ("AC_PATH_REGISTERED");
4036         case AC_PATH_DEREGISTERED: return ("AC_PATH_DEREGISTERED");
4037         case AC_FOUND_DEVICE: return ("AC_FOUND_DEVICE");
4038         case AC_LOST_DEVICE: return ("AC_LOST_DEVICE");
4039         case AC_TRANSFER_NEG: return ("AC_TRANSFER_NEG");
4040         case AC_INQ_CHANGED: return ("AC_INQ_CHANGED");
4041         case AC_GETDEV_CHANGED: return ("AC_GETDEV_CHANGED");
4042         case AC_CONTRACT: return ("AC_CONTRACT");
4043         case AC_ADVINFO_CHANGED: return ("AC_ADVINFO_CHANGED");
4044         case AC_UNIT_ATTENTION: return ("AC_UNIT_ATTENTION");
4045         }
4046         return ("AC_UNKNOWN");
4047 }
4048
4049 static int
4050 xpt_async_size(u_int32_t async_code)
4051 {
4052
4053         switch (async_code) {
4054         case AC_BUS_RESET: return (0);
4055         case AC_UNSOL_RESEL: return (0);
4056         case AC_SCSI_AEN: return (0);
4057         case AC_SENT_BDR: return (0);
4058         case AC_PATH_REGISTERED: return (sizeof(struct ccb_pathinq));
4059         case AC_PATH_DEREGISTERED: return (0);
4060         case AC_FOUND_DEVICE: return (sizeof(struct ccb_getdev));
4061         case AC_LOST_DEVICE: return (0);
4062         case AC_TRANSFER_NEG: return (sizeof(struct ccb_trans_settings));
4063         case AC_INQ_CHANGED: return (0);
4064         case AC_GETDEV_CHANGED: return (0);
4065         case AC_CONTRACT: return (sizeof(struct ac_contract));
4066         case AC_ADVINFO_CHANGED: return (-1);
4067         case AC_UNIT_ATTENTION: return (sizeof(struct ccb_scsiio));
4068         }
4069         return (0);
4070 }
4071
4072 static int
4073 xpt_async_process_dev(struct cam_ed *device, void *arg)
4074 {
4075         union ccb *ccb = arg;
4076         struct cam_path *path = ccb->ccb_h.path;
4077         void *async_arg = ccb->casync.async_arg_ptr;
4078         u_int32_t async_code = ccb->casync.async_code;
4079         int relock;
4080
4081         if (path->device != device
4082          && path->device->lun_id != CAM_LUN_WILDCARD
4083          && device->lun_id != CAM_LUN_WILDCARD)
4084                 return (1);
4085
4086         /*
4087          * The async callback could free the device.
4088          * If it is a broadcast async, it doesn't hold
4089          * device reference, so take our own reference.
4090          */
4091         xpt_acquire_device(device);
4092
4093         /*
4094          * If async for specific device is to be delivered to
4095          * the wildcard client, take the specific device lock.
4096          * XXX: We may need a way for client to specify it.
4097          */
4098         if ((device->lun_id == CAM_LUN_WILDCARD &&
4099              path->device->lun_id != CAM_LUN_WILDCARD) ||
4100             (device->target->target_id == CAM_TARGET_WILDCARD &&
4101              path->target->target_id != CAM_TARGET_WILDCARD) ||
4102             (device->target->bus->path_id == CAM_BUS_WILDCARD &&
4103              path->target->bus->path_id != CAM_BUS_WILDCARD)) {
4104                 mtx_unlock(&device->device_mtx);
4105                 xpt_path_lock(path);
4106                 relock = 1;
4107         } else
4108                 relock = 0;
4109
4110         (*(device->target->bus->xport->async))(async_code,
4111             device->target->bus, device->target, device, async_arg);
4112         xpt_async_bcast(&device->asyncs, async_code, path, async_arg);
4113
4114         if (relock) {
4115                 xpt_path_unlock(path);
4116                 mtx_lock(&device->device_mtx);
4117         }
4118         xpt_release_device(device);
4119         return (1);
4120 }
4121
4122 static int
4123 xpt_async_process_tgt(struct cam_et *target, void *arg)
4124 {
4125         union ccb *ccb = arg;
4126         struct cam_path *path = ccb->ccb_h.path;
4127
4128         if (path->target != target
4129          && path->target->target_id != CAM_TARGET_WILDCARD
4130          && target->target_id != CAM_TARGET_WILDCARD)
4131                 return (1);
4132
4133         if (ccb->casync.async_code == AC_SENT_BDR) {
4134                 /* Update our notion of when the last reset occurred */
4135                 microtime(&target->last_reset);
4136         }
4137
4138         return (xptdevicetraverse(target, NULL, xpt_async_process_dev, ccb));
4139 }
4140
4141 static void
4142 xpt_async_process(struct cam_periph *periph, union ccb *ccb)
4143 {
4144         struct cam_eb *bus;
4145         struct cam_path *path;
4146         void *async_arg;
4147         u_int32_t async_code;
4148
4149         path = ccb->ccb_h.path;
4150         async_code = ccb->casync.async_code;
4151         async_arg = ccb->casync.async_arg_ptr;
4152         CAM_DEBUG(path, CAM_DEBUG_TRACE | CAM_DEBUG_INFO,
4153             ("xpt_async(%s)\n", xpt_async_string(async_code)));
4154         bus = path->bus;
4155
4156         if (async_code == AC_BUS_RESET) {
4157                 /* Update our notion of when the last reset occurred */
4158                 microtime(&bus->last_reset);
4159         }
4160
4161         xpttargettraverse(bus, NULL, xpt_async_process_tgt, ccb);
4162
4163         /*
4164          * If this wasn't a fully wildcarded async, tell all
4165          * clients that want all async events.
4166          */
4167         if (bus != xpt_periph->path->bus) {
4168                 xpt_path_lock(xpt_periph->path);
4169                 xpt_async_process_dev(xpt_periph->path->device, ccb);
4170                 xpt_path_unlock(xpt_periph->path);
4171         }
4172
4173         if (path->device != NULL && path->device->lun_id != CAM_LUN_WILDCARD)
4174                 xpt_release_devq(path, 1, TRUE);
4175         else
4176                 xpt_release_simq(path->bus->sim, TRUE);
4177         if (ccb->casync.async_arg_size > 0)
4178                 free(async_arg, M_CAMXPT);
4179         xpt_free_path(path);
4180         xpt_free_ccb(ccb);
4181 }
4182
4183 static void
4184 xpt_async_bcast(struct async_list *async_head,
4185                 u_int32_t async_code,
4186                 struct cam_path *path, void *async_arg)
4187 {
4188         struct async_node *cur_entry;
4189         int lock;
4190
4191         cur_entry = SLIST_FIRST(async_head);
4192         while (cur_entry != NULL) {
4193                 struct async_node *next_entry;
4194                 /*
4195                  * Grab the next list entry before we call the current
4196                  * entry's callback.  This is because the callback function
4197                  * can delete its async callback entry.
4198                  */
4199                 next_entry = SLIST_NEXT(cur_entry, links);
4200                 if ((cur_entry->event_enable & async_code) != 0) {
4201                         lock = cur_entry->event_lock;
4202                         if (lock)
4203                                 CAM_SIM_LOCK(path->device->sim);
4204                         cur_entry->callback(cur_entry->callback_arg,
4205                                             async_code, path,
4206                                             async_arg);
4207                         if (lock)
4208                                 CAM_SIM_UNLOCK(path->device->sim);
4209                 }
4210                 cur_entry = next_entry;
4211         }
4212 }
4213
4214 void
4215 xpt_async(u_int32_t async_code, struct cam_path *path, void *async_arg)
4216 {
4217         union ccb *ccb;
4218         int size;
4219
4220         ccb = xpt_alloc_ccb_nowait();
4221         if (ccb == NULL) {
4222                 xpt_print(path, "Can't allocate CCB to send %s\n",
4223                     xpt_async_string(async_code));
4224                 return;
4225         }
4226
4227         if (xpt_clone_path(&ccb->ccb_h.path, path) != CAM_REQ_CMP) {
4228                 xpt_print(path, "Can't allocate path to send %s\n",
4229                     xpt_async_string(async_code));
4230                 xpt_free_ccb(ccb);
4231                 return;
4232         }
4233         ccb->ccb_h.path->periph = NULL;
4234         ccb->ccb_h.func_code = XPT_ASYNC;
4235         ccb->ccb_h.cbfcnp = xpt_async_process;
4236         ccb->ccb_h.flags |= CAM_UNLOCKED;
4237         ccb->casync.async_code = async_code;
4238         ccb->casync.async_arg_size = 0;
4239         size = xpt_async_size(async_code);
4240         if (size > 0 && async_arg != NULL) {
4241                 ccb->casync.async_arg_ptr = malloc(size, M_CAMXPT, M_NOWAIT);
4242                 if (ccb->casync.async_arg_ptr == NULL) {
4243                         xpt_print(path, "Can't allocate argument to send %s\n",
4244                             xpt_async_string(async_code));
4245                         xpt_free_path(ccb->ccb_h.path);
4246                         xpt_free_ccb(ccb);
4247                         return;
4248                 }
4249                 memcpy(ccb->casync.async_arg_ptr, async_arg, size);
4250                 ccb->casync.async_arg_size = size;
4251         } else if (size < 0)
4252                 ccb->casync.async_arg_size = size;
4253         if (path->device != NULL && path->device->lun_id != CAM_LUN_WILDCARD)
4254                 xpt_freeze_devq(path, 1);
4255         else
4256                 xpt_freeze_simq(path->bus->sim, 1);
4257         xpt_done(ccb);
4258 }
4259
4260 static void
4261 xpt_dev_async_default(u_int32_t async_code, struct cam_eb *bus,
4262                       struct cam_et *target, struct cam_ed *device,
4263                       void *async_arg)
4264 {
4265
4266         /*
4267          * We only need to handle events for real devices.
4268          */
4269         if (target->target_id == CAM_TARGET_WILDCARD
4270          || device->lun_id == CAM_LUN_WILDCARD)
4271                 return;
4272
4273         printf("%s called\n", __func__);
4274 }
4275
4276 static uint32_t
4277 xpt_freeze_devq_device(struct cam_ed *dev, u_int count)
4278 {
4279         struct cam_devq *devq;
4280         uint32_t freeze;
4281
4282         devq = dev->sim->devq;
4283         mtx_assert(&devq->send_mtx, MA_OWNED);
4284         CAM_DEBUG_DEV(dev, CAM_DEBUG_TRACE,
4285             ("xpt_freeze_devq_device(%d) %u->%u\n", count,
4286             dev->ccbq.queue.qfrozen_cnt, dev->ccbq.queue.qfrozen_cnt + count));
4287         freeze = (dev->ccbq.queue.qfrozen_cnt += count);
4288         /* Remove frozen device from sendq. */
4289         if (device_is_queued(dev))
4290                 camq_remove(&devq->send_queue, dev->devq_entry.index);
4291         return (freeze);
4292 }
4293
4294 u_int32_t
4295 xpt_freeze_devq(struct cam_path *path, u_int count)
4296 {
4297         struct cam_ed   *dev = path->device;
4298         struct cam_devq *devq;
4299         uint32_t         freeze;
4300
4301         devq = dev->sim->devq;
4302         mtx_lock(&devq->send_mtx);
4303         CAM_DEBUG(path, CAM_DEBUG_TRACE, ("xpt_freeze_devq(%d)\n", count));
4304         freeze = xpt_freeze_devq_device(dev, count);
4305         mtx_unlock(&devq->send_mtx);
4306         return (freeze);
4307 }
4308
4309 u_int32_t
4310 xpt_freeze_simq(struct cam_sim *sim, u_int count)
4311 {
4312         struct cam_devq *devq;
4313         uint32_t         freeze;
4314
4315         devq = sim->devq;
4316         mtx_lock(&devq->send_mtx);
4317         freeze = (devq->send_queue.qfrozen_cnt += count);
4318         mtx_unlock(&devq->send_mtx);
4319         return (freeze);
4320 }
4321
4322 static void
4323 xpt_release_devq_timeout(void *arg)
4324 {
4325         struct cam_ed *dev;
4326         struct cam_devq *devq;
4327
4328         dev = (struct cam_ed *)arg;
4329         CAM_DEBUG_DEV(dev, CAM_DEBUG_TRACE, ("xpt_release_devq_timeout\n"));
4330         devq = dev->sim->devq;
4331         mtx_assert(&devq->send_mtx, MA_OWNED);
4332         if (xpt_release_devq_device(dev, /*count*/1, /*run_queue*/TRUE))
4333                 xpt_run_devq(devq);
4334 }
4335
4336 void
4337 xpt_release_devq(struct cam_path *path, u_int count, int run_queue)
4338 {
4339         struct cam_ed *dev;
4340         struct cam_devq *devq;
4341
4342         CAM_DEBUG(path, CAM_DEBUG_TRACE, ("xpt_release_devq(%d, %d)\n",
4343             count, run_queue));
4344         dev = path->device;
4345         devq = dev->sim->devq;
4346         mtx_lock(&devq->send_mtx);
4347         if (xpt_release_devq_device(dev, count, run_queue))
4348                 xpt_run_devq(dev->sim->devq);
4349         mtx_unlock(&devq->send_mtx);
4350 }
4351
4352 static int
4353 xpt_release_devq_device(struct cam_ed *dev, u_int count, int run_queue)
4354 {
4355
4356         mtx_assert(&dev->sim->devq->send_mtx, MA_OWNED);
4357         CAM_DEBUG_DEV(dev, CAM_DEBUG_TRACE,
4358             ("xpt_release_devq_device(%d, %d) %u->%u\n", count, run_queue,
4359             dev->ccbq.queue.qfrozen_cnt, dev->ccbq.queue.qfrozen_cnt - count));
4360         if (count > dev->ccbq.queue.qfrozen_cnt) {
4361 #ifdef INVARIANTS
4362                 printf("xpt_release_devq(): requested %u > present %u\n",
4363                     count, dev->ccbq.queue.qfrozen_cnt);
4364 #endif
4365                 count = dev->ccbq.queue.qfrozen_cnt;
4366         }
4367         dev->ccbq.queue.qfrozen_cnt -= count;
4368         if (dev->ccbq.queue.qfrozen_cnt == 0) {
4369                 /*
4370                  * No longer need to wait for a successful
4371                  * command completion.
4372                  */
4373                 dev->flags &= ~CAM_DEV_REL_ON_COMPLETE;
4374                 /*
4375                  * Remove any timeouts that might be scheduled
4376                  * to release this queue.
4377                  */
4378                 if ((dev->flags & CAM_DEV_REL_TIMEOUT_PENDING) != 0) {
4379                         callout_stop(&dev->callout);
4380                         dev->flags &= ~CAM_DEV_REL_TIMEOUT_PENDING;
4381                 }
4382                 /*
4383                  * Now that we are unfrozen schedule the
4384                  * device so any pending transactions are
4385                  * run.
4386                  */
4387                 xpt_schedule_devq(dev->sim->devq, dev);
4388         } else
4389                 run_queue = 0;
4390         return (run_queue);
4391 }
4392
4393 void
4394 xpt_release_simq(struct cam_sim *sim, int run_queue)
4395 {
4396         struct cam_devq *devq;
4397
4398         devq = sim->devq;
4399         mtx_lock(&devq->send_mtx);
4400         if (devq->send_queue.qfrozen_cnt <= 0) {
4401 #ifdef INVARIANTS
4402                 printf("xpt_release_simq: requested 1 > present %u\n",
4403                     devq->send_queue.qfrozen_cnt);
4404 #endif
4405         } else
4406                 devq->send_queue.qfrozen_cnt--;
4407         if (devq->send_queue.qfrozen_cnt == 0) {
4408                 /*
4409                  * If there is a timeout scheduled to release this
4410                  * sim queue, remove it.  The queue frozen count is
4411                  * already at 0.
4412                  */
4413                 if ((sim->flags & CAM_SIM_REL_TIMEOUT_PENDING) != 0){
4414                         callout_stop(&sim->callout);
4415                         sim->flags &= ~CAM_SIM_REL_TIMEOUT_PENDING;
4416                 }
4417                 if (run_queue) {
4418                         /*
4419                          * Now that we are unfrozen run the send queue.
4420                          */
4421                         xpt_run_devq(sim->devq);
4422                 }
4423         }
4424         mtx_unlock(&devq->send_mtx);
4425 }
4426
4427 /*
4428  * XXX Appears to be unused.
4429  */
4430 static void
4431 xpt_release_simq_timeout(void *arg)
4432 {
4433         struct cam_sim *sim;
4434
4435         sim = (struct cam_sim *)arg;
4436         xpt_release_simq(sim, /* run_queue */ TRUE);
4437 }
4438
4439 void
4440 xpt_done(union ccb *done_ccb)
4441 {
4442         struct cam_doneq *queue;
4443         int     run, hash;
4444
4445         CAM_DEBUG(done_ccb->ccb_h.path, CAM_DEBUG_TRACE, ("xpt_done\n"));
4446         if ((done_ccb->ccb_h.func_code & XPT_FC_QUEUED) == 0)
4447                 return;
4448
4449         hash = (done_ccb->ccb_h.path_id + done_ccb->ccb_h.target_id +
4450             done_ccb->ccb_h.target_lun) % cam_num_doneqs;
4451         queue = &cam_doneqs[hash];
4452         mtx_lock(&queue->cam_doneq_mtx);
4453         run = (queue->cam_doneq_sleep && STAILQ_EMPTY(&queue->cam_doneq));
4454         STAILQ_INSERT_TAIL(&queue->cam_doneq, &done_ccb->ccb_h, sim_links.stqe);
4455         done_ccb->ccb_h.pinfo.index = CAM_DONEQ_INDEX;
4456         mtx_unlock(&queue->cam_doneq_mtx);
4457         if (run)
4458                 wakeup(&queue->cam_doneq);
4459 }
4460
4461 void
4462 xpt_done_direct(union ccb *done_ccb)
4463 {
4464
4465         CAM_DEBUG(done_ccb->ccb_h.path, CAM_DEBUG_TRACE, ("xpt_done_direct\n"));
4466         if ((done_ccb->ccb_h.func_code & XPT_FC_QUEUED) == 0)
4467                 return;
4468
4469         xpt_done_process(&done_ccb->ccb_h);
4470 }
4471
4472 union ccb *
4473 xpt_alloc_ccb()
4474 {
4475         union ccb *new_ccb;
4476
4477         new_ccb = malloc(sizeof(*new_ccb), M_CAMCCB, M_ZERO|M_WAITOK);
4478         return (new_ccb);
4479 }
4480
4481 union ccb *
4482 xpt_alloc_ccb_nowait()
4483 {
4484         union ccb *new_ccb;
4485
4486         new_ccb = malloc(sizeof(*new_ccb), M_CAMCCB, M_ZERO|M_NOWAIT);
4487         return (new_ccb);
4488 }
4489
4490 void
4491 xpt_free_ccb(union ccb *free_ccb)
4492 {
4493         free(free_ccb, M_CAMCCB);
4494 }
4495
4496
4497
4498 /* Private XPT functions */
4499
4500 /*
4501  * Get a CAM control block for the caller. Charge the structure to the device
4502  * referenced by the path.  If we don't have sufficient resources to allocate
4503  * more ccbs, we return NULL.
4504  */
4505 static union ccb *
4506 xpt_get_ccb_nowait(struct cam_periph *periph)
4507 {
4508         union ccb *new_ccb;
4509
4510         new_ccb = malloc(sizeof(*new_ccb), M_CAMCCB, M_NOWAIT);
4511         if (new_ccb == NULL)
4512                 return (NULL);
4513         periph->periph_allocated++;
4514         cam_ccbq_take_opening(&periph->path->device->ccbq);
4515         return (new_ccb);
4516 }
4517
4518 static union ccb *
4519 xpt_get_ccb(struct cam_periph *periph)
4520 {
4521         union ccb *new_ccb;
4522
4523         cam_periph_unlock(periph);
4524         new_ccb = malloc(sizeof(*new_ccb), M_CAMCCB, M_WAITOK);
4525         cam_periph_lock(periph);
4526         periph->periph_allocated++;
4527         cam_ccbq_take_opening(&periph->path->device->ccbq);
4528         return (new_ccb);
4529 }
4530
4531 union ccb *
4532 cam_periph_getccb(struct cam_periph *periph, u_int32_t priority)
4533 {
4534         struct ccb_hdr *ccb_h;
4535
4536         CAM_DEBUG(periph->path, CAM_DEBUG_TRACE, ("cam_periph_getccb\n"));
4537         cam_periph_assert(periph, MA_OWNED);
4538         while ((ccb_h = SLIST_FIRST(&periph->ccb_list)) == NULL ||
4539             ccb_h->pinfo.priority != priority) {
4540                 if (priority < periph->immediate_priority) {
4541                         periph->immediate_priority = priority;
4542                         xpt_run_allocq(periph, 0);
4543                 } else
4544                         cam_periph_sleep(periph, &periph->ccb_list, PRIBIO,
4545                             "cgticb", 0);
4546         }
4547         SLIST_REMOVE_HEAD(&periph->ccb_list, periph_links.sle);
4548         return ((union ccb *)ccb_h);
4549 }
4550
4551 static void
4552 xpt_acquire_bus(struct cam_eb *bus)
4553 {
4554
4555         xpt_lock_buses();
4556         bus->refcount++;
4557         xpt_unlock_buses();
4558 }
4559
4560 static void
4561 xpt_release_bus(struct cam_eb *bus)
4562 {
4563
4564         xpt_lock_buses();
4565         KASSERT(bus->refcount >= 1, ("bus->refcount >= 1"));
4566         if (--bus->refcount > 0) {
4567                 xpt_unlock_buses();
4568                 return;
4569         }
4570         TAILQ_REMOVE(&xsoftc.xpt_busses, bus, links);
4571         xsoftc.bus_generation++;
4572         xpt_unlock_buses();
4573         KASSERT(TAILQ_EMPTY(&bus->et_entries),
4574             ("destroying bus, but target list is not empty"));
4575         cam_sim_release(bus->sim);
4576         mtx_destroy(&bus->eb_mtx);
4577         free(bus, M_CAMXPT);
4578 }
4579
4580 static struct cam_et *
4581 xpt_alloc_target(struct cam_eb *bus, target_id_t target_id)
4582 {
4583         struct cam_et *cur_target, *target;
4584
4585         mtx_assert(&xsoftc.xpt_topo_lock, MA_OWNED);
4586         mtx_assert(&bus->eb_mtx, MA_OWNED);
4587         target = (struct cam_et *)malloc(sizeof(*target), M_CAMXPT,
4588                                          M_NOWAIT|M_ZERO);
4589         if (target == NULL)
4590                 return (NULL);
4591
4592         TAILQ_INIT(&target->ed_entries);
4593         target->bus = bus;
4594         target->target_id = target_id;
4595         target->refcount = 1;
4596         target->generation = 0;
4597         target->luns = NULL;
4598         mtx_init(&target->luns_mtx, "CAM LUNs lock", NULL, MTX_DEF);
4599         timevalclear(&target->last_reset);
4600         /*
4601          * Hold a reference to our parent bus so it
4602          * will not go away before we do.
4603          */
4604         bus->refcount++;
4605
4606         /* Insertion sort into our bus's target list */
4607         cur_target = TAILQ_FIRST(&bus->et_entries);
4608         while (cur_target != NULL && cur_target->target_id < target_id)
4609                 cur_target = TAILQ_NEXT(cur_target, links);
4610         if (cur_target != NULL) {
4611                 TAILQ_INSERT_BEFORE(cur_target, target, links);
4612         } else {
4613                 TAILQ_INSERT_TAIL(&bus->et_entries, target, links);
4614         }
4615         bus->generation++;
4616         return (target);
4617 }
4618
4619 static void
4620 xpt_acquire_target(struct cam_et *target)
4621 {
4622         struct cam_eb *bus = target->bus;
4623
4624         mtx_lock(&bus->eb_mtx);
4625         target->refcount++;
4626         mtx_unlock(&bus->eb_mtx);
4627 }
4628
4629 static void
4630 xpt_release_target(struct cam_et *target)
4631 {
4632         struct cam_eb *bus = target->bus;
4633
4634         mtx_lock(&bus->eb_mtx);
4635         if (--target->refcount > 0) {
4636                 mtx_unlock(&bus->eb_mtx);
4637                 return;
4638         }
4639         TAILQ_REMOVE(&bus->et_entries, target, links);
4640         bus->generation++;
4641         mtx_unlock(&bus->eb_mtx);
4642         KASSERT(TAILQ_EMPTY(&target->ed_entries),
4643             ("destroying target, but device list is not empty"));
4644         xpt_release_bus(bus);
4645         mtx_destroy(&target->luns_mtx);
4646         if (target->luns)
4647                 free(target->luns, M_CAMXPT);
4648         free(target, M_CAMXPT);
4649 }
4650
4651 static struct cam_ed *
4652 xpt_alloc_device_default(struct cam_eb *bus, struct cam_et *target,
4653                          lun_id_t lun_id)
4654 {
4655         struct cam_ed *device;
4656
4657         device = xpt_alloc_device(bus, target, lun_id);
4658         if (device == NULL)
4659                 return (NULL);
4660
4661         device->mintags = 1;
4662         device->maxtags = 1;
4663         return (device);
4664 }
4665
4666 static void
4667 xpt_destroy_device(void *context, int pending)
4668 {
4669         struct cam_ed   *device = context;
4670
4671         mtx_lock(&device->device_mtx);
4672         mtx_destroy(&device->device_mtx);
4673         free(device, M_CAMDEV);
4674 }
4675
4676 struct cam_ed *
4677 xpt_alloc_device(struct cam_eb *bus, struct cam_et *target, lun_id_t lun_id)
4678 {
4679         struct cam_ed   *cur_device, *device;
4680         struct cam_devq *devq;
4681         cam_status status;
4682
4683         mtx_assert(&bus->eb_mtx, MA_OWNED);
4684         /* Make space for us in the device queue on our bus */
4685         devq = bus->sim->devq;
4686         mtx_lock(&devq->send_mtx);
4687         status = cam_devq_resize(devq, devq->send_queue.array_size + 1);
4688         mtx_unlock(&devq->send_mtx);
4689         if (status != CAM_REQ_CMP)
4690                 return (NULL);
4691
4692         device = (struct cam_ed *)malloc(sizeof(*device),
4693                                          M_CAMDEV, M_NOWAIT|M_ZERO);
4694         if (device == NULL)
4695                 return (NULL);
4696
4697         cam_init_pinfo(&device->devq_entry);
4698         device->target = target;
4699         device->lun_id = lun_id;
4700         device->sim = bus->sim;
4701         if (cam_ccbq_init(&device->ccbq,
4702                           bus->sim->max_dev_openings) != 0) {
4703                 free(device, M_CAMDEV);
4704                 return (NULL);
4705         }
4706         SLIST_INIT(&device->asyncs);
4707         SLIST_INIT(&device->periphs);
4708         device->generation = 0;
4709         device->flags = CAM_DEV_UNCONFIGURED;
4710         device->tag_delay_count = 0;
4711         device->tag_saved_openings = 0;
4712         device->refcount = 1;
4713         mtx_init(&device->device_mtx, "CAM device lock", NULL, MTX_DEF);
4714         callout_init_mtx(&device->callout, &devq->send_mtx, 0);
4715         TASK_INIT(&device->device_destroy_task, 0, xpt_destroy_device, device);
4716         /*
4717          * Hold a reference to our parent bus so it
4718          * will not go away before we do.
4719          */
4720         target->refcount++;
4721
4722         cur_device = TAILQ_FIRST(&target->ed_entries);
4723         while (cur_device != NULL && cur_device->lun_id < lun_id)
4724                 cur_device = TAILQ_NEXT(cur_device, links);
4725         if (cur_device != NULL)
4726                 TAILQ_INSERT_BEFORE(cur_device, device, links);
4727         else
4728                 TAILQ_INSERT_TAIL(&target->ed_entries, device, links);
4729         target->generation++;
4730         return (device);
4731 }
4732
4733 void
4734 xpt_acquire_device(struct cam_ed *device)
4735 {
4736         struct cam_eb *bus = device->target->bus;
4737
4738         mtx_lock(&bus->eb_mtx);
4739         device->refcount++;
4740         mtx_unlock(&bus->eb_mtx);
4741 }
4742
4743 void
4744 xpt_release_device(struct cam_ed *device)
4745 {
4746         struct cam_eb *bus = device->target->bus;
4747         struct cam_devq *devq;
4748
4749         mtx_lock(&bus->eb_mtx);
4750         if (--device->refcount > 0) {
4751                 mtx_unlock(&bus->eb_mtx);
4752                 return;
4753         }
4754
4755         TAILQ_REMOVE(&device->target->ed_entries, device,links);
4756         device->target->generation++;
4757         mtx_unlock(&bus->eb_mtx);
4758
4759         /* Release our slot in the devq */
4760         devq = bus->sim->devq;
4761         mtx_lock(&devq->send_mtx);
4762         cam_devq_resize(devq, devq->send_queue.array_size - 1);
4763         mtx_unlock(&devq->send_mtx);
4764
4765         KASSERT(SLIST_EMPTY(&device->periphs),
4766             ("destroying device, but periphs list is not empty"));
4767         KASSERT(device->devq_entry.index == CAM_UNQUEUED_INDEX,
4768             ("destroying device while still queued for ccbs"));
4769
4770         if ((device->flags & CAM_DEV_REL_TIMEOUT_PENDING) != 0)
4771                 callout_stop(&device->callout);
4772
4773         xpt_release_target(device->target);
4774
4775         cam_ccbq_fini(&device->ccbq);
4776         /*
4777          * Free allocated memory.  free(9) does nothing if the
4778          * supplied pointer is NULL, so it is safe to call without
4779          * checking.
4780          */
4781         free(device->supported_vpds, M_CAMXPT);
4782         free(device->device_id, M_CAMXPT);
4783         free(device->physpath, M_CAMXPT);
4784         free(device->rcap_buf, M_CAMXPT);
4785         free(device->serial_num, M_CAMXPT);
4786         taskqueue_enqueue(xsoftc.xpt_taskq, &device->device_destroy_task);
4787 }
4788
4789 u_int32_t
4790 xpt_dev_ccbq_resize(struct cam_path *path, int newopenings)
4791 {
4792         int     result;
4793         struct  cam_ed *dev;
4794
4795         dev = path->device;
4796         mtx_lock(&dev->sim->devq->send_mtx);
4797         result = cam_ccbq_resize(&dev->ccbq, newopenings);
4798         mtx_unlock(&dev->sim->devq->send_mtx);
4799         if ((dev->flags & CAM_DEV_TAG_AFTER_COUNT) != 0
4800          || (dev->inq_flags & SID_CmdQue) != 0)
4801                 dev->tag_saved_openings = newopenings;
4802         return (result);
4803 }
4804
4805 static struct cam_eb *
4806 xpt_find_bus(path_id_t path_id)
4807 {
4808         struct cam_eb *bus;
4809
4810         xpt_lock_buses();
4811         for (bus = TAILQ_FIRST(&xsoftc.xpt_busses);
4812              bus != NULL;
4813              bus = TAILQ_NEXT(bus, links)) {
4814                 if (bus->path_id == path_id) {
4815                         bus->refcount++;
4816                         break;
4817                 }
4818         }
4819         xpt_unlock_buses();
4820         return (bus);
4821 }
4822
4823 static struct cam_et *
4824 xpt_find_target(struct cam_eb *bus, target_id_t target_id)
4825 {
4826         struct cam_et *target;
4827
4828         mtx_assert(&bus->eb_mtx, MA_OWNED);
4829         for (target = TAILQ_FIRST(&bus->et_entries);
4830              target != NULL;
4831              target = TAILQ_NEXT(target, links)) {
4832                 if (target->target_id == target_id) {
4833                         target->refcount++;
4834                         break;
4835                 }
4836         }
4837         return (target);
4838 }
4839
4840 static struct cam_ed *
4841 xpt_find_device(struct cam_et *target, lun_id_t lun_id)
4842 {
4843         struct cam_ed *device;
4844
4845         mtx_assert(&target->bus->eb_mtx, MA_OWNED);
4846         for (device = TAILQ_FIRST(&target->ed_entries);
4847              device != NULL;
4848              device = TAILQ_NEXT(device, links)) {
4849                 if (device->lun_id == lun_id) {
4850                         device->refcount++;
4851                         break;
4852                 }
4853         }
4854         return (device);
4855 }
4856
4857 void
4858 xpt_start_tags(struct cam_path *path)
4859 {
4860         struct ccb_relsim crs;
4861         struct cam_ed *device;
4862         struct cam_sim *sim;
4863         int    newopenings;
4864
4865         device = path->device;
4866         sim = path->bus->sim;
4867         device->flags &= ~CAM_DEV_TAG_AFTER_COUNT;
4868         xpt_freeze_devq(path, /*count*/1);
4869         device->inq_flags |= SID_CmdQue;
4870         if (device->tag_saved_openings != 0)
4871                 newopenings = device->tag_saved_openings;
4872         else
4873                 newopenings = min(device->maxtags,
4874                                   sim->max_tagged_dev_openings);
4875         xpt_dev_ccbq_resize(path, newopenings);
4876         xpt_async(AC_GETDEV_CHANGED, path, NULL);
4877         xpt_setup_ccb(&crs.ccb_h, path, CAM_PRIORITY_NORMAL);
4878         crs.ccb_h.func_code = XPT_REL_SIMQ;
4879         crs.release_flags = RELSIM_RELEASE_AFTER_QEMPTY;
4880         crs.openings
4881             = crs.release_timeout
4882             = crs.qfrozen_cnt
4883             = 0;
4884         xpt_action((union ccb *)&crs);
4885 }
4886
4887 void
4888 xpt_stop_tags(struct cam_path *path)
4889 {
4890         struct ccb_relsim crs;
4891         struct cam_ed *device;
4892         struct cam_sim *sim;
4893
4894         device = path->device;
4895         sim = path->bus->sim;
4896         device->flags &= ~CAM_DEV_TAG_AFTER_COUNT;
4897         device->tag_delay_count = 0;
4898         xpt_freeze_devq(path, /*count*/1);
4899         device->inq_flags &= ~SID_CmdQue;
4900         xpt_dev_ccbq_resize(path, sim->max_dev_openings);
4901         xpt_async(AC_GETDEV_CHANGED, path, NULL);
4902         xpt_setup_ccb(&crs.ccb_h, path, CAM_PRIORITY_NORMAL);
4903         crs.ccb_h.func_code = XPT_REL_SIMQ;
4904         crs.release_flags = RELSIM_RELEASE_AFTER_QEMPTY;
4905         crs.openings
4906             = crs.release_timeout
4907             = crs.qfrozen_cnt
4908             = 0;
4909         xpt_action((union ccb *)&crs);
4910 }
4911
4912 static void
4913 xpt_boot_delay(void *arg)
4914 {
4915
4916         xpt_release_boot();
4917 }
4918
4919 static void
4920 xpt_config(void *arg)
4921 {
4922         /*
4923          * Now that interrupts are enabled, go find our devices
4924          */
4925         if (taskqueue_start_threads(&xsoftc.xpt_taskq, 1, PRIBIO, "CAM taskq"))
4926                 printf("xpt_config: failed to create taskqueue thread.\n");
4927
4928         /* Setup debugging path */
4929         if (cam_dflags != CAM_DEBUG_NONE) {
4930                 if (xpt_create_path(&cam_dpath, NULL,
4931                                     CAM_DEBUG_BUS, CAM_DEBUG_TARGET,
4932                                     CAM_DEBUG_LUN) != CAM_REQ_CMP) {
4933                         printf("xpt_config: xpt_create_path() failed for debug"
4934                                " target %d:%d:%d, debugging disabled\n",
4935                                CAM_DEBUG_BUS, CAM_DEBUG_TARGET, CAM_DEBUG_LUN);
4936                         cam_dflags = CAM_DEBUG_NONE;
4937                 }
4938         } else
4939                 cam_dpath = NULL;
4940
4941         periphdriver_init(1);
4942         xpt_hold_boot();
4943         callout_init(&xsoftc.boot_callout, 1);
4944         callout_reset(&xsoftc.boot_callout, hz * xsoftc.boot_delay / 1000,
4945             xpt_boot_delay, NULL);
4946         /* Fire up rescan thread. */
4947         if (kproc_kthread_add(xpt_scanner_thread, NULL, &cam_proc, NULL, 0, 0,
4948             "cam", "scanner")) {
4949                 printf("xpt_config: failed to create rescan thread.\n");
4950         }
4951 }
4952
4953 void
4954 xpt_hold_boot(void)
4955 {
4956         xpt_lock_buses();
4957         xsoftc.buses_to_config++;
4958         xpt_unlock_buses();
4959 }
4960
4961 void
4962 xpt_release_boot(void)
4963 {
4964         xpt_lock_buses();
4965         xsoftc.buses_to_config--;
4966         if (xsoftc.buses_to_config == 0 && xsoftc.buses_config_done == 0) {
4967                 struct  xpt_task *task;
4968
4969                 xsoftc.buses_config_done = 1;
4970                 xpt_unlock_buses();
4971                 /* Call manually because we don't have any busses */
4972                 task = malloc(sizeof(struct xpt_task), M_CAMXPT, M_NOWAIT);
4973                 if (task != NULL) {
4974                         TASK_INIT(&task->task, 0, xpt_finishconfig_task, task);
4975                         taskqueue_enqueue(taskqueue_thread, &task->task);
4976                 }
4977         } else
4978                 xpt_unlock_buses();
4979 }
4980
4981 /*
4982  * If the given device only has one peripheral attached to it, and if that
4983  * peripheral is the passthrough driver, announce it.  This insures that the
4984  * user sees some sort of announcement for every peripheral in their system.
4985  */
4986 static int
4987 xptpassannouncefunc(struct cam_ed *device, void *arg)
4988 {
4989         struct cam_periph *periph;
4990         int i;
4991
4992         for (periph = SLIST_FIRST(&device->periphs), i = 0; periph != NULL;
4993              periph = SLIST_NEXT(periph, periph_links), i++);
4994
4995         periph = SLIST_FIRST(&device->periphs);
4996         if ((i == 1)
4997          && (strncmp(periph->periph_name, "pass", 4) == 0))
4998                 xpt_announce_periph(periph, NULL);
4999
5000         return(1);
5001 }
5002
5003 static void
5004 xpt_finishconfig_task(void *context, int pending)
5005 {
5006
5007         periphdriver_init(2);
5008         /*
5009          * Check for devices with no "standard" peripheral driver
5010          * attached.  For any devices like that, announce the
5011          * passthrough driver so the user will see something.
5012          */
5013         if (!bootverbose)
5014                 xpt_for_all_devices(xptpassannouncefunc, NULL);
5015
5016         /* Release our hook so that the boot can continue. */
5017         config_intrhook_disestablish(xsoftc.xpt_config_hook);
5018         free(xsoftc.xpt_config_hook, M_CAMXPT);
5019         xsoftc.xpt_config_hook = NULL;
5020
5021         free(context, M_CAMXPT);
5022 }
5023
5024 cam_status
5025 xpt_register_async(int event, ac_callback_t *cbfunc, void *cbarg,
5026                    struct cam_path *path)
5027 {
5028         struct ccb_setasync csa;
5029         cam_status status;
5030         int xptpath = 0;
5031
5032         if (path == NULL) {
5033                 status = xpt_create_path(&path, /*periph*/NULL, CAM_XPT_PATH_ID,
5034                                          CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD);
5035                 if (status != CAM_REQ_CMP)
5036                         return (status);
5037                 xpt_path_lock(path);
5038                 xptpath = 1;
5039         }
5040
5041         xpt_setup_ccb(&csa.ccb_h, path, CAM_PRIORITY_NORMAL);
5042         csa.ccb_h.func_code = XPT_SASYNC_CB;
5043         csa.event_enable = event;
5044         csa.callback = cbfunc;
5045         csa.callback_arg = cbarg;
5046         xpt_action((union ccb *)&csa);
5047         status = csa.ccb_h.status;
5048
5049         if (xptpath) {
5050                 xpt_path_unlock(path);
5051                 xpt_free_path(path);
5052         }
5053
5054         if ((status == CAM_REQ_CMP) &&
5055             (csa.event_enable & AC_FOUND_DEVICE)) {
5056                 /*
5057                  * Get this peripheral up to date with all
5058                  * the currently existing devices.
5059                  */
5060                 xpt_for_all_devices(xptsetasyncfunc, &csa);
5061         }
5062         if ((status == CAM_REQ_CMP) &&
5063             (csa.event_enable & AC_PATH_REGISTERED)) {
5064                 /*
5065                  * Get this peripheral up to date with all
5066                  * the currently existing busses.
5067                  */
5068                 xpt_for_all_busses(xptsetasyncbusfunc, &csa);
5069         }
5070
5071         return (status);
5072 }
5073
5074 static void
5075 xptaction(struct cam_sim *sim, union ccb *work_ccb)
5076 {
5077         CAM_DEBUG(work_ccb->ccb_h.path, CAM_DEBUG_TRACE, ("xptaction\n"));
5078
5079         switch (work_ccb->ccb_h.func_code) {
5080         /* Common cases first */
5081         case XPT_PATH_INQ:              /* Path routing inquiry */
5082         {
5083                 struct ccb_pathinq *cpi;
5084
5085                 cpi = &work_ccb->cpi;
5086                 cpi->version_num = 1; /* XXX??? */
5087                 cpi->hba_inquiry = 0;
5088                 cpi->target_sprt = 0;
5089                 cpi->hba_misc = 0;
5090                 cpi->hba_eng_cnt = 0;
5091                 cpi->max_target = 0;
5092                 cpi->max_lun = 0;
5093                 cpi->initiator_id = 0;
5094                 strncpy(cpi->sim_vid, "FreeBSD", SIM_IDLEN);
5095                 strncpy(cpi->hba_vid, "", HBA_IDLEN);
5096                 strncpy(cpi->dev_name, sim->sim_name, DEV_IDLEN);
5097                 cpi->unit_number = sim->unit_number;
5098                 cpi->bus_id = sim->bus_id;
5099                 cpi->base_transfer_speed = 0;
5100                 cpi->protocol = PROTO_UNSPECIFIED;
5101                 cpi->protocol_version = PROTO_VERSION_UNSPECIFIED;
5102                 cpi->transport = XPORT_UNSPECIFIED;
5103                 cpi->transport_version = XPORT_VERSION_UNSPECIFIED;
5104                 cpi->ccb_h.status = CAM_REQ_CMP;
5105                 xpt_done(work_ccb);
5106                 break;
5107         }
5108         default:
5109                 work_ccb->ccb_h.status = CAM_REQ_INVALID;
5110                 xpt_done(work_ccb);
5111                 break;
5112         }
5113 }
5114
5115 /*
5116  * The xpt as a "controller" has no interrupt sources, so polling
5117  * is a no-op.
5118  */
5119 static void
5120 xptpoll(struct cam_sim *sim)
5121 {
5122 }
5123
5124 void
5125 xpt_lock_buses(void)
5126 {
5127         mtx_lock(&xsoftc.xpt_topo_lock);
5128 }
5129
5130 void
5131 xpt_unlock_buses(void)
5132 {
5133         mtx_unlock(&xsoftc.xpt_topo_lock);
5134 }
5135
5136 struct mtx *
5137 xpt_path_mtx(struct cam_path *path)
5138 {
5139
5140         return (&path->device->device_mtx);
5141 }
5142
5143 static void
5144 xpt_done_process(struct ccb_hdr *ccb_h)
5145 {
5146         struct cam_sim *sim;
5147         struct cam_devq *devq;
5148         struct mtx *mtx = NULL;
5149
5150         if (ccb_h->flags & CAM_HIGH_POWER) {
5151                 struct highpowerlist    *hphead;
5152                 struct cam_ed           *device;
5153
5154                 mtx_lock(&xsoftc.xpt_highpower_lock);
5155                 hphead = &xsoftc.highpowerq;
5156
5157                 device = STAILQ_FIRST(hphead);
5158
5159                 /*
5160                  * Increment the count since this command is done.
5161                  */
5162                 xsoftc.num_highpower++;
5163
5164                 /*
5165                  * Any high powered commands queued up?
5166                  */
5167                 if (device != NULL) {
5168
5169                         STAILQ_REMOVE_HEAD(hphead, highpowerq_entry);
5170                         mtx_unlock(&xsoftc.xpt_highpower_lock);
5171
5172                         mtx_lock(&device->sim->devq->send_mtx);
5173                         xpt_release_devq_device(device,
5174                                          /*count*/1, /*runqueue*/TRUE);
5175                         mtx_unlock(&device->sim->devq->send_mtx);
5176                 } else
5177                         mtx_unlock(&xsoftc.xpt_highpower_lock);
5178         }
5179
5180         sim = ccb_h->path->bus->sim;
5181
5182         if (ccb_h->status & CAM_RELEASE_SIMQ) {
5183                 xpt_release_simq(sim, /*run_queue*/FALSE);
5184                 ccb_h->status &= ~CAM_RELEASE_SIMQ;
5185         }
5186
5187         if ((ccb_h->flags & CAM_DEV_QFRZDIS)
5188          && (ccb_h->status & CAM_DEV_QFRZN)) {
5189                 xpt_release_devq(ccb_h->path, /*count*/1, /*run_queue*/TRUE);
5190                 ccb_h->status &= ~CAM_DEV_QFRZN;
5191         }
5192
5193         devq = sim->devq;
5194         if ((ccb_h->func_code & XPT_FC_USER_CCB) == 0) {
5195                 struct cam_ed *dev = ccb_h->path->device;
5196
5197                 mtx_lock(&devq->send_mtx);
5198                 devq->send_active--;
5199                 devq->send_openings++;
5200                 cam_ccbq_ccb_done(&dev->ccbq, (union ccb *)ccb_h);
5201
5202                 if (((dev->flags & CAM_DEV_REL_ON_QUEUE_EMPTY) != 0
5203                   && (dev->ccbq.dev_active == 0))) {
5204                         dev->flags &= ~CAM_DEV_REL_ON_QUEUE_EMPTY;
5205                         xpt_release_devq_device(dev, /*count*/1,
5206                                          /*run_queue*/FALSE);
5207                 }
5208
5209                 if (((dev->flags & CAM_DEV_REL_ON_COMPLETE) != 0
5210                   && (ccb_h->status&CAM_STATUS_MASK) != CAM_REQUEUE_REQ)) {
5211                         dev->flags &= ~CAM_DEV_REL_ON_COMPLETE;
5212                         xpt_release_devq_device(dev, /*count*/1,
5213                                          /*run_queue*/FALSE);
5214                 }
5215
5216                 if (!device_is_queued(dev))
5217                         (void)xpt_schedule_devq(devq, dev);
5218                 xpt_run_devq(devq);
5219                 mtx_unlock(&devq->send_mtx);
5220
5221                 if ((dev->flags & CAM_DEV_TAG_AFTER_COUNT) != 0) {
5222                         mtx = xpt_path_mtx(ccb_h->path);
5223                         mtx_lock(mtx);
5224
5225                         if ((dev->flags & CAM_DEV_TAG_AFTER_COUNT) != 0
5226                          && (--dev->tag_delay_count == 0))
5227                                 xpt_start_tags(ccb_h->path);
5228                 }
5229         }
5230
5231         if ((ccb_h->flags & CAM_UNLOCKED) == 0) {
5232                 if (mtx == NULL) {
5233                         mtx = xpt_path_mtx(ccb_h->path);
5234                         mtx_lock(mtx);
5235                 }
5236         } else {
5237                 if (mtx != NULL) {
5238                         mtx_unlock(mtx);
5239                         mtx = NULL;
5240                 }
5241         }
5242
5243         /* Call the peripheral driver's callback */
5244         ccb_h->pinfo.index = CAM_UNQUEUED_INDEX;
5245         (*ccb_h->cbfcnp)(ccb_h->path->periph, (union ccb *)ccb_h);
5246         if (mtx != NULL)
5247                 mtx_unlock(mtx);
5248 }
5249
5250 void
5251 xpt_done_td(void *arg)
5252 {
5253         struct cam_doneq *queue = arg;
5254         struct ccb_hdr *ccb_h;
5255         STAILQ_HEAD(, ccb_hdr)  doneq;
5256
5257         STAILQ_INIT(&doneq);
5258         mtx_lock(&queue->cam_doneq_mtx);
5259         while (1) {
5260                 while (STAILQ_EMPTY(&queue->cam_doneq)) {
5261                         queue->cam_doneq_sleep = 1;
5262                         msleep(&queue->cam_doneq, &queue->cam_doneq_mtx,
5263                             PRIBIO, "-", 0);
5264                         queue->cam_doneq_sleep = 0;
5265                 }
5266                 STAILQ_CONCAT(&doneq, &queue->cam_doneq);
5267                 mtx_unlock(&queue->cam_doneq_mtx);
5268
5269                 THREAD_NO_SLEEPING();
5270                 while ((ccb_h = STAILQ_FIRST(&doneq)) != NULL) {
5271                         STAILQ_REMOVE_HEAD(&doneq, sim_links.stqe);
5272                         xpt_done_process(ccb_h);
5273                 }
5274                 THREAD_SLEEPING_OK();
5275
5276                 mtx_lock(&queue->cam_doneq_mtx);
5277         }
5278 }
5279
5280 static void
5281 camisr_runqueue(void)
5282 {
5283         struct  ccb_hdr *ccb_h;
5284         struct cam_doneq *queue;
5285         int i;
5286
5287         /* Process global queues. */
5288         for (i = 0; i < cam_num_doneqs; i++) {
5289                 queue = &cam_doneqs[i];
5290                 mtx_lock(&queue->cam_doneq_mtx);
5291                 while ((ccb_h = STAILQ_FIRST(&queue->cam_doneq)) != NULL) {
5292                         STAILQ_REMOVE_HEAD(&queue->cam_doneq, sim_links.stqe);
5293                         mtx_unlock(&queue->cam_doneq_mtx);
5294                         xpt_done_process(ccb_h);
5295                         mtx_lock(&queue->cam_doneq_mtx);
5296                 }
5297                 mtx_unlock(&queue->cam_doneq_mtx);
5298         }
5299 }