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         uint32_t                xpt_generation;
  97
  98         /* number of high powered commands that can go through right now */
  99         struct mtx              xpt_highpower_lock;
 100         STAILQ_HEAD(highpowerlist, cam_ed)      highpowerq;
 101         int                     num_highpower;
 102
 103         /* queue for handling async rescan requests. */
 104         TAILQ_HEAD(, ccb_hdr) ccb_scanq;
 105         int buses_to_config;
 106         int buses_config_done;
 107
 108         /* Registered busses */
 109         TAILQ_HEAD(,cam_eb)     xpt_busses;
 110         u_int                   bus_generation;
 111
 112         struct intr_config_hook *xpt_config_hook;
 113
 114         int                     boot_delay;
 115         struct callout          boot_callout;
 116
 117         struct mtx              xpt_topo_lock;
 118         struct mtx              xpt_lock;
 119         struct taskqueue        *xpt_taskq;
 120 };
 121
 122 typedef enum {
 123         DM_RET_COPY             = 0x01,
 124         DM_RET_FLAG_MASK        = 0x0f,
 125         DM_RET_NONE             = 0x00,
 126         DM_RET_STOP             = 0x10,
 127         DM_RET_DESCEND          = 0x20,
 128         DM_RET_ERROR            = 0x30,
 129         DM_RET_ACTION_MASK      = 0xf0
 130 } dev_match_ret;
 131
 132 typedef enum {
 133         XPT_DEPTH_BUS,
 134         XPT_DEPTH_TARGET,
 135         XPT_DEPTH_DEVICE,
 136         XPT_DEPTH_PERIPH
 137 } xpt_traverse_depth;
 138
 139 struct xpt_traverse_config {
 140         xpt_traverse_depth      depth;
 141         void                    *tr_func;
 142         void                    *tr_arg;
 143 };
 144
 145 typedef int     xpt_busfunc_t (struct cam_eb *bus, void *arg);
 146 typedef int     xpt_targetfunc_t (struct cam_et *target, void *arg);
 147 typedef int     xpt_devicefunc_t (struct cam_ed *device, void *arg);
 148 typedef int     xpt_periphfunc_t (struct cam_periph *periph, void *arg);
 149 typedef int     xpt_pdrvfunc_t (struct periph_driver **pdrv, void *arg);
 150
 151 /* Transport layer configuration information */
 152 static struct xpt_softc xsoftc;
 153
 154 MTX_SYSINIT(xpt_topo_init, &xsoftc.xpt_topo_lock, "XPT topology lock", MTX_DEF);
 155
 156 SYSCTL_INT(_kern_cam, OID_AUTO, boot_delay, CTLFLAG_RDTUN,
 157            &xsoftc.boot_delay, 0, "Bus registration wait time");
 158 SYSCTL_UINT(_kern_cam, OID_AUTO, xpt_generation, CTLFLAG_RD,
 159             &xsoftc.xpt_generation, 0, "CAM peripheral generation count");
 160
 161 struct cam_doneq {
 162         struct mtx_padalign     cam_doneq_mtx;
 163         STAILQ_HEAD(, ccb_hdr)  cam_doneq;
 164         int                     cam_doneq_sleep;
 165 };
 166
 167 static struct cam_doneq cam_doneqs[MAXCPU];
 168 static int cam_num_doneqs;
 169 static struct proc *cam_proc;
 170
 171 SYSCTL_INT(_kern_cam, OID_AUTO, num_doneqs, CTLFLAG_RDTUN,
 172            &cam_num_doneqs, 0, "Number of completion queues/threads");
 173
 174 struct cam_periph *xpt_periph;
 175
 176 static periph_init_t xpt_periph_init;
 177
 178 static struct periph_driver xpt_driver =
 179 {
 180         xpt_periph_init, "xpt",
 181         TAILQ_HEAD_INITIALIZER(xpt_driver.units), /* generation */ 0,
 182         CAM_PERIPH_DRV_EARLY
 183 };
 184
 185 PERIPHDRIVER_DECLARE(xpt, xpt_driver);
 186
 187 static d_open_t xptopen;
 188 static d_close_t xptclose;
 189 static d_ioctl_t xptioctl;
 190 static d_ioctl_t xptdoioctl;
 191
 192 static struct cdevsw xpt_cdevsw = {
 193         .d_version =    D_VERSION,
 194         .d_flags =      0,
 195         .d_open =       xptopen,
 196         .d_close =      xptclose,
 197         .d_ioctl =      xptioctl,
 198         .d_name =       "xpt",
 199 };
 200
 201 /* Storage for debugging datastructures */
 202 struct cam_path *cam_dpath;
 203 u_int32_t cam_dflags = CAM_DEBUG_FLAGS;
 204 SYSCTL_UINT(_kern_cam, OID_AUTO, dflags, CTLFLAG_RWTUN,
 205         &cam_dflags, 0, "Enabled debug flags");
 206 u_int32_t cam_debug_delay = CAM_DEBUG_DELAY;
 207 SYSCTL_UINT(_kern_cam, OID_AUTO, debug_delay, CTLFLAG_RWTUN,
 208         &cam_debug_delay, 0, "Delay in us after each debug message");
 209
 210 /* Our boot-time initialization hook */
 211 static int cam_module_event_handler(module_t, int /*modeventtype_t*/, void *);
 212
 213 static moduledata_t cam_moduledata = {
 214         "cam",
 215         cam_module_event_handler,
 216         NULL
 217 };
 218
 219 static int      xpt_init(void *);
 220
 221 DECLARE_MODULE(cam, cam_moduledata, SI_SUB_CONFIGURE, SI_ORDER_SECOND);
 222 MODULE_VERSION(cam, 1);
 223
 224
 225 static void             xpt_async_bcast(struct async_list *async_head,
 226                                         u_int32_t async_code,
 227                                         struct cam_path *path,
 228                                         void *async_arg);
 229 static path_id_t xptnextfreepathid(void);
 230 static path_id_t xptpathid(const char *sim_name, int sim_unit, int sim_bus);
 231 static union ccb *xpt_get_ccb(struct cam_periph *periph);
 232 static union ccb *xpt_get_ccb_nowait(struct cam_periph *periph);
 233 static void      xpt_run_allocq(struct cam_periph *periph, int sleep);
 234 static void      xpt_run_allocq_task(void *context, int pending);
 235 static void      xpt_run_devq(struct cam_devq *devq);
 236 static timeout_t xpt_release_devq_timeout;
 237 static void      xpt_release_simq_timeout(void *arg) __unused;
 238 static void      xpt_acquire_bus(struct cam_eb *bus);
 239 static void      xpt_release_bus(struct cam_eb *bus);
 240 static uint32_t  xpt_freeze_devq_device(struct cam_ed *dev, u_int count);
 241 static int       xpt_release_devq_device(struct cam_ed *dev, u_int count,
 242                     int run_queue);
 243 static struct cam_et*
 244                  xpt_alloc_target(struct cam_eb *bus, target_id_t target_id);
 245 static void      xpt_acquire_target(struct cam_et *target);
 246 static void      xpt_release_target(struct cam_et *target);
 247 static struct cam_eb*
 248                  xpt_find_bus(path_id_t path_id);
 249 static struct cam_et*
 250                  xpt_find_target(struct cam_eb *bus, target_id_t target_id);
 251 static struct cam_ed*
 252                  xpt_find_device(struct cam_et *target, lun_id_t lun_id);
 253 static void      xpt_config(void *arg);
 254 static int       xpt_schedule_dev(struct camq *queue, cam_pinfo *dev_pinfo,
 255                                  u_int32_t new_priority);
 256 static xpt_devicefunc_t xptpassannouncefunc;
 257 static void      xptaction(struct cam_sim *sim, union ccb *work_ccb);
 258 static void      xptpoll(struct cam_sim *sim);
 259 static void      camisr_runqueue(void);
 260 static void      xpt_done_process(struct ccb_hdr *ccb_h);
 261 static void      xpt_done_td(void *);
 262 static dev_match_ret    xptbusmatch(struct dev_match_pattern *patterns,
 263                                     u_int num_patterns, struct cam_eb *bus);
 264 static dev_match_ret    xptdevicematch(struct dev_match_pattern *patterns,
 265                                        u_int num_patterns,
 266                                        struct cam_ed *device);
 267 static dev_match_ret    xptperiphmatch(struct dev_match_pattern *patterns,
 268                                        u_int num_patterns,
 269                                        struct cam_periph *periph);
 270 static xpt_busfunc_t    xptedtbusfunc;
 271 static xpt_targetfunc_t xptedttargetfunc;
 272 static xpt_devicefunc_t xptedtdevicefunc;
 273 static xpt_periphfunc_t xptedtperiphfunc;
 274 static xpt_pdrvfunc_t   xptplistpdrvfunc;
 275 static xpt_periphfunc_t xptplistperiphfunc;
 276 static int              xptedtmatch(struct ccb_dev_match *cdm);
 277 static int              xptperiphlistmatch(struct ccb_dev_match *cdm);
 278 static int              xptbustraverse(struct cam_eb *start_bus,
 279                                        xpt_busfunc_t *tr_func, void *arg);
 280 static int              xpttargettraverse(struct cam_eb *bus,
 281                                           struct cam_et *start_target,
 282                                           xpt_targetfunc_t *tr_func, void *arg);
 283 static int              xptdevicetraverse(struct cam_et *target,
 284                                           struct cam_ed *start_device,
 285                                           xpt_devicefunc_t *tr_func, void *arg);
 286 static int              xptperiphtraverse(struct cam_ed *device,
 287                                           struct cam_periph *start_periph,
 288                                           xpt_periphfunc_t *tr_func, void *arg);
 289 static int              xptpdrvtraverse(struct periph_driver **start_pdrv,
 290                                         xpt_pdrvfunc_t *tr_func, void *arg);
 291 static int              xptpdperiphtraverse(struct periph_driver **pdrv,
 292                                             struct cam_periph *start_periph,
 293                                             xpt_periphfunc_t *tr_func,
 294                                             void *arg);
 295 static xpt_busfunc_t    xptdefbusfunc;
 296 static xpt_targetfunc_t xptdeftargetfunc;
 297 static xpt_devicefunc_t xptdefdevicefunc;
 298 static xpt_periphfunc_t xptdefperiphfunc;
 299 static void             xpt_finishconfig_task(void *context, int pending);
 300 static void             xpt_dev_async_default(u_int32_t async_code,
 301                                               struct cam_eb *bus,
 302                                               struct cam_et *target,
 303                                               struct cam_ed *device,
 304                                               void *async_arg);
 305 static struct cam_ed *  xpt_alloc_device_default(struct cam_eb *bus,
 306                                                  struct cam_et *target,
 307                                                  lun_id_t lun_id);
 308 static xpt_devicefunc_t xptsetasyncfunc;
 309 static xpt_busfunc_t    xptsetasyncbusfunc;
 310 static cam_status       xptregister(struct cam_periph *periph,
 311                                     void *arg);
 312 static __inline int device_is_queued(struct cam_ed *device);
 313
 314 static __inline int
 315 xpt_schedule_devq(struct cam_devq *devq, struct cam_ed *dev)
 316 {
 317         int     retval;
 318
 319         mtx_assert(&devq->send_mtx, MA_OWNED);
 320         if ((dev->ccbq.queue.entries > 0) &&
 321             (dev->ccbq.dev_openings > 0) &&
 322             (dev->ccbq.queue.qfrozen_cnt == 0)) {
 323                 /*
 324                  * The priority of a device waiting for controller
 325                  * resources is that of the highest priority CCB
 326                  * enqueued.
 327                  */
 328                 retval =
 329                     xpt_schedule_dev(&devq->send_queue,
 330                                      &dev->devq_entry,
 331                                      CAMQ_GET_PRIO(&dev->ccbq.queue));
 332         } else {
 333                 retval = 0;
 334         }
 335         return (retval);
 336 }
 337
 338 static __inline int
 339 device_is_queued(struct cam_ed *device)
 340 {
 341         return (device->devq_entry.index != CAM_UNQUEUED_INDEX);
 342 }
 343
 344 static void
 345 xpt_periph_init()
 346 {
 347         make_dev(&xpt_cdevsw, 0, UID_ROOT, GID_OPERATOR, 0600, "xpt0");
 348 }
 349
 350 static int
 351 xptopen(struct cdev *dev, int flags, int fmt, struct thread *td)
 352 {
 353
 354         /*
 355          * Only allow read-write access.
 356          */
 357         if (((flags & FWRITE) == 0) || ((flags & FREAD) == 0))
 358                 return(EPERM);
 359
 360         /*
 361          * We don't allow nonblocking access.
 362          */
 363         if ((flags & O_NONBLOCK) != 0) {
 364                 printf("%s: can't do nonblocking access\n", devtoname(dev));
 365                 return(ENODEV);
 366         }
 367
 368         return(0);
 369 }
 370
 371 static int
 372 xptclose(struct cdev *dev, int flag, int fmt, struct thread *td)
 373 {
 374
 375         return(0);
 376 }
 377
 378 /*
 379  * Don't automatically grab the xpt softc lock here even though this is going
 380  * through the xpt device.  The xpt device is really just a back door for
 381  * accessing other devices and SIMs, so the right thing to do is to grab
 382  * the appropriate SIM lock once the bus/SIM is located.
 383  */
 384 static int
 385 xptioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flag, struct thread *td)
 386 {
 387         int error;
 388
 389         if ((error = xptdoioctl(dev, cmd, addr, flag, td)) == ENOTTY) {
 390                 error = cam_compat_ioctl(dev, cmd, addr, flag, td, xptdoioctl);
 391         }
 392         return (error);
 393 }
 394
 395 static int
 396 xptdoioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flag, struct thread *td)
 397 {
 398         int error;
 399
 400         error = 0;
 401
 402         switch(cmd) {
 403         /*
 404          * For the transport layer CAMIOCOMMAND ioctl, we really only want
 405          * to accept CCB types that don't quite make sense to send through a
 406          * passthrough driver. XPT_PATH_INQ is an exception to this, as stated
 407          * in the CAM spec.
 408          */
 409         case CAMIOCOMMAND: {
 410                 union ccb *ccb;
 411                 union ccb *inccb;
 412                 struct cam_eb *bus;
 413
 414                 inccb = (union ccb *)addr;
 415
 416                 bus = xpt_find_bus(inccb->ccb_h.path_id);
 417                 if (bus == NULL)
 418                         return (EINVAL);
 419
 420                 switch (inccb->ccb_h.func_code) {
 421                 case XPT_SCAN_BUS:
 422                 case XPT_RESET_BUS:
 423                         if (inccb->ccb_h.target_id != CAM_TARGET_WILDCARD ||
 424                             inccb->ccb_h.target_lun != CAM_LUN_WILDCARD) {
 425                                 xpt_release_bus(bus);
 426                                 return (EINVAL);
 427                         }
 428                         break;
 429                 case XPT_SCAN_TGT:
 430                         if (inccb->ccb_h.target_id == CAM_TARGET_WILDCARD ||
 431                             inccb->ccb_h.target_lun != CAM_LUN_WILDCARD) {
 432                                 xpt_release_bus(bus);
 433                                 return (EINVAL);
 434                         }
 435                         break;
 436                 default:
 437                         break;
 438                 }
 439
 440                 switch(inccb->ccb_h.func_code) {
 441                 case XPT_SCAN_BUS:
 442                 case XPT_RESET_BUS:
 443                 case XPT_PATH_INQ:
 444                 case XPT_ENG_INQ:
 445                 case XPT_SCAN_LUN:
 446                 case XPT_SCAN_TGT:
 447
 448                         ccb = xpt_alloc_ccb();
 449
 450                         /*
 451                          * Create a path using the bus, target, and lun the
 452                          * user passed in.
 453                          */
 454                         if (xpt_create_path(&ccb->ccb_h.path, NULL,
 455                                             inccb->ccb_h.path_id,
 456                                             inccb->ccb_h.target_id,
 457                                             inccb->ccb_h.target_lun) !=
 458                                             CAM_REQ_CMP){
 459                                 error = EINVAL;
 460                                 xpt_free_ccb(ccb);
 461                                 break;
 462                         }
 463                         /* Ensure all of our fields are correct */
 464                         xpt_setup_ccb(&ccb->ccb_h, ccb->ccb_h.path,
 465                                       inccb->ccb_h.pinfo.priority);
 466                         xpt_merge_ccb(ccb, inccb);
 467                         xpt_path_lock(ccb->ccb_h.path);
 468                         cam_periph_runccb(ccb, NULL, 0, 0, NULL);
 469                         xpt_path_unlock(ccb->ccb_h.path);
 470                         bcopy(ccb, inccb, sizeof(union ccb));
 471                         xpt_free_path(ccb->ccb_h.path);
 472                         xpt_free_ccb(ccb);
 473                         break;
 474
 475                 case XPT_DEBUG: {
 476                         union ccb ccb;
 477
 478                         /*
 479                          * This is an immediate CCB, so it's okay to
 480                          * allocate it on the stack.
 481                          */
 482
 483                         /*
 484                          * Create a path using the bus, target, and lun the
 485                          * user passed in.
 486                          */
 487                         if (xpt_create_path(&ccb.ccb_h.path, NULL,
 488                                             inccb->ccb_h.path_id,
 489                                             inccb->ccb_h.target_id,
 490                                             inccb->ccb_h.target_lun) !=
 491                                             CAM_REQ_CMP){
 492                                 error = EINVAL;
 493                                 break;
 494                         }
 495                         /* Ensure all of our fields are correct */
 496                         xpt_setup_ccb(&ccb.ccb_h, ccb.ccb_h.path,
 497                                       inccb->ccb_h.pinfo.priority);
 498                         xpt_merge_ccb(&ccb, inccb);
 499                         xpt_action(&ccb);
 500                         bcopy(&ccb, inccb, sizeof(union ccb));
 501                         xpt_free_path(ccb.ccb_h.path);
 502                         break;
 503
 504                 }
 505                 case XPT_DEV_MATCH: {
 506                         struct cam_periph_map_info mapinfo;
 507                         struct cam_path *old_path;
 508
 509                         /*
 510                          * We can't deal with physical addresses for this
 511                          * type of transaction.
 512                          */
 513                         if ((inccb->ccb_h.flags & CAM_DATA_MASK) !=
 514                             CAM_DATA_VADDR) {
 515                                 error = EINVAL;
 516                                 break;
 517                         }
 518
 519                         /*
 520                          * Save this in case the caller had it set to
 521                          * something in particular.
 522                          */
 523                         old_path = inccb->ccb_h.path;
 524
 525                         /*
 526                          * We really don't need a path for the matching
 527                          * code.  The path is needed because of the
 528                          * debugging statements in xpt_action().  They
 529                          * assume that the CCB has a valid path.
 530                          */
 531                         inccb->ccb_h.path = xpt_periph->path;
 532
 533                         bzero(&mapinfo, sizeof(mapinfo));
 534
 535                         /*
 536                          * Map the pattern and match buffers into kernel
 537                          * virtual address space.
 538                          */
 539                         error = cam_periph_mapmem(inccb, &mapinfo, MAXPHYS);
 540
 541                         if (error) {
 542                                 inccb->ccb_h.path = old_path;
 543                                 break;
 544                         }
 545
 546                         /*
 547                          * This is an immediate CCB, we can send it on directly.
 548                          */
 549                         xpt_action(inccb);
 550
 551                         /*
 552                          * Map the buffers back into user space.
 553                          */
 554                         cam_periph_unmapmem(inccb, &mapinfo);
 555
 556                         inccb->ccb_h.path = old_path;
 557
 558                         error = 0;
 559                         break;
 560                 }
 561                 default:
 562                         error = ENOTSUP;
 563                         break;
 564                 }
 565                 xpt_release_bus(bus);
 566                 break;
 567         }
 568         /*
 569          * This is the getpassthru ioctl. It takes a XPT_GDEVLIST ccb as input,
 570          * with the periphal driver name and unit name filled in.  The other
 571          * fields don't really matter as input.  The passthrough driver name
 572          * ("pass"), and unit number are passed back in the ccb.  The current
 573          * device generation number, and the index into the device peripheral
 574          * driver list, and the status are also passed back.  Note that
 575          * since we do everything in one pass, unlike the XPT_GDEVLIST ccb,
 576          * we never return a status of CAM_GDEVLIST_LIST_CHANGED.  It is
 577          * (or rather should be) impossible for the device peripheral driver
 578          * list to change since we look at the whole thing in one pass, and
 579          * we do it with lock protection.
 580          *
 581          */
 582         case CAMGETPASSTHRU: {
 583                 union ccb *ccb;
 584                 struct cam_periph *periph;
 585                 struct periph_driver **p_drv;
 586                 char   *name;
 587                 u_int unit;
 588                 int base_periph_found;
 589
 590                 ccb = (union ccb *)addr;
 591                 unit = ccb->cgdl.unit_number;
 592                 name = ccb->cgdl.periph_name;
 593                 base_periph_found = 0;
 594
 595                 /*
 596                  * Sanity check -- make sure we don't get a null peripheral
 597                  * driver name.
 598                  */
 599                 if (*ccb->cgdl.periph_name == '\0') {
 600                         error = EINVAL;
 601                         break;
 602                 }
 603
 604                 /* Keep the list from changing while we traverse it */
 605                 xpt_lock_buses();
 606
 607                 /* first find our driver in the list of drivers */
 608                 for (p_drv = periph_drivers; *p_drv != NULL; p_drv++)
 609                         if (strcmp((*p_drv)->driver_name, name) == 0)
 610                                 break;
 611
 612                 if (*p_drv == NULL) {
 613                         xpt_unlock_buses();
 614                         ccb->ccb_h.status = CAM_REQ_CMP_ERR;
 615                         ccb->cgdl.status = CAM_GDEVLIST_ERROR;
 616                         *ccb->cgdl.periph_name = '\0';
 617                         ccb->cgdl.unit_number = 0;
 618                         error = ENOENT;
 619                         break;
 620                 }
 621
 622                 /*
 623                  * Run through every peripheral instance of this driver
 624                  * and check to see whether it matches the unit passed
 625                  * in by the user.  If it does, get out of the loops and
 626                  * find the passthrough driver associated with that
 627                  * peripheral driver.
 628                  */
 629                 for (periph = TAILQ_FIRST(&(*p_drv)->units); periph != NULL;
 630                      periph = TAILQ_NEXT(periph, unit_links)) {
 631
 632                         if (periph->unit_number == unit)
 633                                 break;
 634                 }
 635                 /*
 636                  * If we found the peripheral driver that the user passed
 637                  * in, go through all of the peripheral drivers for that
 638                  * particular device and look for a passthrough driver.
 639                  */
 640                 if (periph != NULL) {
 641                         struct cam_ed *device;
 642                         int i;
 643
 644                         base_periph_found = 1;
 645                         device = periph->path->device;
 646                         for (i = 0, periph = SLIST_FIRST(&device->periphs);
 647                              periph != NULL;
 648                              periph = SLIST_NEXT(periph, periph_links), i++) {
 649                                 /*
 650                                  * Check to see whether we have a
 651                                  * passthrough device or not.
 652                                  */
 653                                 if (strcmp(periph->periph_name, "pass") == 0) {
 654                                         /*
 655                                          * Fill in the getdevlist fields.
 656                                          */
 657                                         strcpy(ccb->cgdl.periph_name,
 658                                                periph->periph_name);
 659                                         ccb->cgdl.unit_number =
 660                                                 periph->unit_number;
 661                                         if (SLIST_NEXT(periph, periph_links))
 662                                                 ccb->cgdl.status =
 663                                                         CAM_GDEVLIST_MORE_DEVS;
 664                                         else
 665                                                 ccb->cgdl.status =
 666                                                        CAM_GDEVLIST_LAST_DEVICE;
 667                                         ccb->cgdl.generation =
 668                                                 device->generation;
 669                                         ccb->cgdl.index = i;
 670                                         /*
 671                                          * Fill in some CCB header fields
 672                                          * that the user may want.
 673                                          */
 674                                         ccb->ccb_h.path_id =
 675                                                 periph->path->bus->path_id;
 676                                         ccb->ccb_h.target_id =
 677                                                 periph->path->target->target_id;
 678                                         ccb->ccb_h.target_lun =
 679                                                 periph->path->device->lun_id;
 680                                         ccb->ccb_h.status = CAM_REQ_CMP;
 681                                         break;
 682                                 }
 683                         }
 684                 }
 685
 686                 /*
 687                  * If the periph is null here, one of two things has
 688                  * happened.  The first possibility is that we couldn't
 689                  * find the unit number of the particular peripheral driver
 690                  * that the user is asking about.  e.g. the user asks for
 691                  * the passthrough driver for "da11".  We find the list of
 692                  * "da" peripherals all right, but there is no unit 11.
 693                  * The other possibility is that we went through the list
 694                  * of peripheral drivers attached to the device structure,
 695                  * but didn't find one with the name "pass".  Either way,
 696                  * we return ENOENT, since we couldn't find something.
 697                  */
 698                 if (periph == NULL) {
 699                         ccb->ccb_h.status = CAM_REQ_CMP_ERR;
 700                         ccb->cgdl.status = CAM_GDEVLIST_ERROR;
 701                         *ccb->cgdl.periph_name = '\0';
 702                         ccb->cgdl.unit_number = 0;
 703                         error = ENOENT;
 704                         /*
 705                          * It is unfortunate that this is even necessary,
 706                          * but there are many, many clueless users out there.
 707                          * If this is true, the user is looking for the
 708                          * passthrough driver, but doesn't have one in his
 709                          * kernel.
 710                          */
 711                         if (base_periph_found == 1) {
 712                                 printf("xptioctl: pass driver is not in the "
 713                                        "kernel\n");
 714                                 printf("xptioctl: put \"device pass\" in "
 715                                        "your kernel config file\n");
 716                         }
 717                 }
 718                 xpt_unlock_buses();
 719                 break;
 720                 }
 721         default:
 722                 error = ENOTTY;
 723                 break;
 724         }
 725
 726         return(error);
 727 }
 728
 729 static int
 730 cam_module_event_handler(module_t mod, int what, void *arg)
 731 {
 732         int error;
 733
 734         switch (what) {
 735         case MOD_LOAD:
 736                 if ((error = xpt_init(NULL)) != 0)
 737                         return (error);
 738                 break;
 739         case MOD_UNLOAD:
 740                 return EBUSY;
 741         default:
 742                 return EOPNOTSUPP;
 743         }
 744
 745         return 0;
 746 }
 747
 748 static void
 749 xpt_rescan_done(struct cam_periph *periph, union ccb *done_ccb)
 750 {
 751
 752         if (done_ccb->ccb_h.ppriv_ptr1 == NULL) {
 753                 xpt_free_path(done_ccb->ccb_h.path);
 754                 xpt_free_ccb(done_ccb);
 755         } else {
 756                 done_ccb->ccb_h.cbfcnp = done_ccb->ccb_h.ppriv_ptr1;
 757                 (*done_ccb->ccb_h.cbfcnp)(periph, done_ccb);
 758         }
 759         xpt_release_boot();
 760 }
 761
 762 /* thread to handle bus rescans */
 763 static void
 764 xpt_scanner_thread(void *dummy)
 765 {
 766         union ccb       *ccb;
 767         struct cam_path  path;
 768
 769         xpt_lock_buses();
 770         for (;;) {
 771                 if (TAILQ_EMPTY(&xsoftc.ccb_scanq))
 772                         msleep(&xsoftc.ccb_scanq, &xsoftc.xpt_topo_lock, PRIBIO,
 773                                "-", 0);
 774                 if ((ccb = (union ccb *)TAILQ_FIRST(&xsoftc.ccb_scanq)) != NULL) {
 775                         TAILQ_REMOVE(&xsoftc.ccb_scanq, &ccb->ccb_h, sim_links.tqe);
 776                         xpt_unlock_buses();
 777
 778                         /*
 779                          * Since lock can be dropped inside and path freed
 780                          * by completion callback even before return here,
 781                          * take our own path copy for reference.
 782                          */
 783                         xpt_copy_path(&path, ccb->ccb_h.path);
 784                         xpt_path_lock(&path);
 785                         xpt_action(ccb);
 786                         xpt_path_unlock(&path);
 787                         xpt_release_path(&path);
 788
 789                         xpt_lock_buses();
 790                 }
 791         }
 792 }
 793
 794 void
 795 xpt_rescan(union ccb *ccb)
 796 {
 797         struct ccb_hdr *hdr;
 798
 799         /* Prepare request */
 800         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_BUS;
 803         else if (ccb->ccb_h.path->target->target_id != CAM_TARGET_WILDCARD &&
 804             ccb->ccb_h.path->device->lun_id == CAM_LUN_WILDCARD)
 805                 ccb->ccb_h.func_code = XPT_SCAN_TGT;
 806         else if (ccb->ccb_h.path->target->target_id != CAM_TARGET_WILDCARD &&
 807             ccb->ccb_h.path->device->lun_id != CAM_LUN_WILDCARD)
 808                 ccb->ccb_h.func_code = XPT_SCAN_LUN;
 809         else {
 810                 xpt_print(ccb->ccb_h.path, "illegal scan path\n");
 811                 xpt_free_path(ccb->ccb_h.path);
 812                 xpt_free_ccb(ccb);
 813                 return;
 814         }
 815         ccb->ccb_h.ppriv_ptr1 = ccb->ccb_h.cbfcnp;
 816         ccb->ccb_h.cbfcnp = xpt_rescan_done;
 817         xpt_setup_ccb(&ccb->ccb_h, ccb->ccb_h.path, CAM_PRIORITY_XPT);
 818         /* Don't make duplicate entries for the same paths. */
 819         xpt_lock_buses();
 820         if (ccb->ccb_h.ppriv_ptr1 == NULL) {
 821                 TAILQ_FOREACH(hdr, &xsoftc.ccb_scanq, sim_links.tqe) {
 822                         if (xpt_path_comp(hdr->path, ccb->ccb_h.path) == 0) {
 823                                 wakeup(&xsoftc.ccb_scanq);
 824                                 xpt_unlock_buses();
 825                                 xpt_print(ccb->ccb_h.path, "rescan already queued\n");
 826                                 xpt_free_path(ccb->ccb_h.path);
 827                                 xpt_free_ccb(ccb);
 828                                 return;
 829                         }
 830                 }
 831         }
 832         TAILQ_INSERT_TAIL(&xsoftc.ccb_scanq, &ccb->ccb_h, sim_links.tqe);
 833         xsoftc.buses_to_config++;
 834         wakeup(&xsoftc.ccb_scanq);
 835         xpt_unlock_buses();
 836 }
 837
 838 /* Functions accessed by the peripheral drivers */
 839 static int
 840 xpt_init(void *dummy)
 841 {
 842         struct cam_sim *xpt_sim;
 843         struct cam_path *path;
 844         struct cam_devq *devq;
 845         cam_status status;
 846         int error, i;
 847
 848         TAILQ_INIT(&xsoftc.xpt_busses);
 849         TAILQ_INIT(&xsoftc.ccb_scanq);
 850         STAILQ_INIT(&xsoftc.highpowerq);
 851         xsoftc.num_highpower = CAM_MAX_HIGHPOWER;
 852
 853         mtx_init(&xsoftc.xpt_lock, "XPT lock", NULL, MTX_DEF);
 854         mtx_init(&xsoftc.xpt_highpower_lock, "XPT highpower lock", NULL, MTX_DEF);
 855         xsoftc.xpt_taskq = taskqueue_create("CAM XPT task", M_WAITOK,
 856             taskqueue_thread_enqueue, /*context*/&xsoftc.xpt_taskq);
 857
 858 #ifdef CAM_BOOT_DELAY
 859         /*
 860          * Override this value at compile time to assist our users
 861          * who don't use loader to boot a kernel.
 862          */
 863         xsoftc.boot_delay = CAM_BOOT_DELAY;
 864 #endif
 865         /*
 866          * The xpt layer is, itself, the equivelent of a SIM.
 867          * Allow 16 ccbs in the ccb pool for it.  This should
 868          * give decent parallelism when we probe busses and
 869          * perform other XPT functions.
 870          */
 871         devq = cam_simq_alloc(16);
 872         xpt_sim = cam_sim_alloc(xptaction,
 873                                 xptpoll,
 874                                 "xpt",
 875                                 /*softc*/NULL,
 876                                 /*unit*/0,
 877                                 /*mtx*/&xsoftc.xpt_lock,
 878                                 /*max_dev_transactions*/0,
 879                                 /*max_tagged_dev_transactions*/0,
 880                                 devq);
 881         if (xpt_sim == NULL)
 882                 return (ENOMEM);
 883
 884         mtx_lock(&xsoftc.xpt_lock);
 885         if ((status = xpt_bus_register(xpt_sim, NULL, 0)) != CAM_SUCCESS) {
 886                 mtx_unlock(&xsoftc.xpt_lock);
 887                 printf("xpt_init: xpt_bus_register failed with status %#x,"
 888                        " failing attach\n", status);
 889                 return (EINVAL);
 890         }
 891         mtx_unlock(&xsoftc.xpt_lock);
 892
 893         /*
 894          * Looking at the XPT from the SIM layer, the XPT is
 895          * the equivelent of a peripheral driver.  Allocate
 896          * a peripheral driver entry for us.
 897          */
 898         if ((status = xpt_create_path(&path, NULL, CAM_XPT_PATH_ID,
 899                                       CAM_TARGET_WILDCARD,
 900                                       CAM_LUN_WILDCARD)) != CAM_REQ_CMP) {
 901                 printf("xpt_init: xpt_create_path failed with status %#x,"
 902                        " failing attach\n", status);
 903                 return (EINVAL);
 904         }
 905         xpt_path_lock(path);
 906         cam_periph_alloc(xptregister, NULL, NULL, NULL, "xpt", CAM_PERIPH_BIO,
 907                          path, NULL, 0, xpt_sim);
 908         xpt_path_unlock(path);
 909         xpt_free_path(path);
 910
 911         if (cam_num_doneqs < 1)
 912                 cam_num_doneqs = 1 + mp_ncpus / 6;
 913         else if (cam_num_doneqs > MAXCPU)
 914                 cam_num_doneqs = MAXCPU;
 915         for (i = 0; i < cam_num_doneqs; i++) {
 916                 mtx_init(&cam_doneqs[i].cam_doneq_mtx, "CAM doneq", NULL,
 917                     MTX_DEF);
 918                 STAILQ_INIT(&cam_doneqs[i].cam_doneq);
 919                 error = kproc_kthread_add(xpt_done_td, &cam_doneqs[i],
 920                     &cam_proc, NULL, 0, 0, "cam", "doneq%d", i);
 921                 if (error != 0) {
 922                         cam_num_doneqs = i;
 923                         break;
 924                 }
 925         }
 926         if (cam_num_doneqs < 1) {
 927                 printf("xpt_init: Cannot init completion queues "
 928                        "- failing attach\n");
 929                 return (ENOMEM);
 930         }
 931         /*
 932          * Register a callback for when interrupts are enabled.
 933          */
 934         xsoftc.xpt_config_hook =
 935             (struct intr_config_hook *)malloc(sizeof(struct intr_config_hook),
 936                                               M_CAMXPT, M_NOWAIT | M_ZERO);
 937         if (xsoftc.xpt_config_hook == NULL) {
 938                 printf("xpt_init: Cannot malloc config hook "
 939                        "- failing attach\n");
 940                 return (ENOMEM);
 941         }
 942         xsoftc.xpt_config_hook->ich_func = xpt_config;
 943         if (config_intrhook_establish(xsoftc.xpt_config_hook) != 0) {
 944                 free (xsoftc.xpt_config_hook, M_CAMXPT);
 945                 printf("xpt_init: config_intrhook_establish failed "
 946                        "- failing attach\n");
 947         }
 948
 949         return (0);
 950 }
 951
 952 static cam_status
 953 xptregister(struct cam_periph *periph, void *arg)
 954 {
 955         struct cam_sim *xpt_sim;
 956
 957         if (periph == NULL) {
 958                 printf("xptregister: periph was NULL!!\n");
 959                 return(CAM_REQ_CMP_ERR);
 960         }
 961
 962         xpt_sim = (struct cam_sim *)arg;
 963         xpt_sim->softc = periph;
 964         xpt_periph = periph;
 965         periph->softc = NULL;
 966
 967         return(CAM_REQ_CMP);
 968 }
 969
 970 int32_t
 971 xpt_add_periph(struct cam_periph *periph)
 972 {
 973         struct cam_ed *device;
 974         int32_t  status;
 975
 976         TASK_INIT(&periph->periph_run_task, 0, xpt_run_allocq_task, periph);
 977         device = periph->path->device;
 978         status = CAM_REQ_CMP;
 979         if (device != NULL) {
 980                 mtx_lock(&device->target->bus->eb_mtx);
 981                 device->generation++;
 982                 SLIST_INSERT_HEAD(&device->periphs, periph, periph_links);
 983                 mtx_unlock(&device->target->bus->eb_mtx);
 984                 atomic_add_32(&xsoftc.xpt_generation, 1);
 985         }
 986
 987         return (status);
 988 }
 989
 990 void
 991 xpt_remove_periph(struct cam_periph *periph)
 992 {
 993         struct cam_ed *device;
 994
 995         device = periph->path->device;
 996         if (device != NULL) {
 997                 mtx_lock(&device->target->bus->eb_mtx);
 998                 device->generation++;
 999                 SLIST_REMOVE(&device->periphs, periph, cam_periph, periph_links);
1000                 mtx_unlock(&device->target->bus->eb_mtx);
1001                 atomic_add_32(&xsoftc.xpt_generation, 1);
1002         }
1003 }
1004
1005
1006 void
1007 xpt_announce_periph(struct cam_periph *periph, char *announce_string)
1008 {
1009         struct  cam_path *path = periph->path;
1010
1011         cam_periph_assert(periph, MA_OWNED);
1012         periph->flags |= CAM_PERIPH_ANNOUNCED;
1013
1014         printf("%s%d at %s%d bus %d scbus%d target %d lun %jx\n",
1015                periph->periph_name, periph->unit_number,
1016                path->bus->sim->sim_name,
1017                path->bus->sim->unit_number,
1018                path->bus->sim->bus_id,
1019                path->bus->path_id,
1020                path->target->target_id,
1021                (uintmax_t)path->device->lun_id);
1022         printf("%s%d: ", periph->periph_name, periph->unit_number);
1023         if (path->device->protocol == PROTO_SCSI)
1024                 scsi_print_inquiry(&path->device->inq_data);
1025         else if (path->device->protocol == PROTO_ATA ||
1026             path->device->protocol == PROTO_SATAPM)
1027                 ata_print_ident(&path->device->ident_data);
1028         else if (path->device->protocol == PROTO_SEMB)
1029                 semb_print_ident(
1030                     (struct sep_identify_data *)&path->device->ident_data);
1031         else
1032                 printf("Unknown protocol device\n");
1033         if (path->device->serial_num_len > 0) {
1034                 /* Don't wrap the screen  - print only the first 60 chars */
1035                 printf("%s%d: Serial Number %.60s\n", periph->periph_name,
1036                        periph->unit_number, path->device->serial_num);
1037         }
1038         /* Announce transport details. */
1039         (*(path->bus->xport->announce))(periph);
1040         /* Announce command queueing. */
1041         if (path->device->inq_flags & SID_CmdQue
1042          || path->device->flags & CAM_DEV_TAG_AFTER_COUNT) {
1043                 printf("%s%d: Command Queueing enabled\n",
1044                        periph->periph_name, periph->unit_number);
1045         }
1046         /* Announce caller's details if they've passed in. */
1047         if (announce_string != NULL)
1048                 printf("%s%d: %s\n", periph->periph_name,
1049                        periph->unit_number, announce_string);
1050 }
1051
1052 void
1053 xpt_announce_quirks(struct cam_periph *periph, int quirks, char *bit_string)
1054 {
1055         if (quirks != 0) {
1056                 printf("%s%d: quirks=0x%b\n", periph->periph_name,
1057                     periph->unit_number, quirks, bit_string);
1058         }
1059 }
1060
1061 void
1062 xpt_denounce_periph(struct cam_periph *periph)
1063 {
1064         struct  cam_path *path = periph->path;
1065
1066         cam_periph_assert(periph, MA_OWNED);
1067         printf("%s%d at %s%d bus %d scbus%d target %d lun %jx\n",
1068                periph->periph_name, periph->unit_number,
1069                path->bus->sim->sim_name,
1070                path->bus->sim->unit_number,
1071                path->bus->sim->bus_id,
1072                path->bus->path_id,
1073                path->target->target_id,
1074                (uintmax_t)path->device->lun_id);
1075         printf("%s%d: ", periph->periph_name, periph->unit_number);
1076         if (path->device->protocol == PROTO_SCSI)
1077                 scsi_print_inquiry_short(&path->device->inq_data);
1078         else if (path->device->protocol == PROTO_ATA ||
1079             path->device->protocol == PROTO_SATAPM)
1080                 ata_print_ident_short(&path->device->ident_data);
1081         else if (path->device->protocol == PROTO_SEMB)
1082                 semb_print_ident_short(
1083                     (struct sep_identify_data *)&path->device->ident_data);
1084         else
1085                 printf("Unknown protocol device");
1086         if (path->device->serial_num_len > 0)
1087                 printf(" s/n %.60s", path->device->serial_num);
1088         printf(" detached\n");
1089 }
1090
1091
1092 int
1093 xpt_getattr(char *buf, size_t len, const char *attr, struct cam_path *path)
1094 {
1095         int ret = -1, l;
1096         struct ccb_dev_advinfo cdai;
1097         struct scsi_vpd_id_descriptor *idd;
1098
1099         xpt_path_assert(path, MA_OWNED);
1100
1101         memset(&cdai, 0, sizeof(cdai));
1102         xpt_setup_ccb(&cdai.ccb_h, path, CAM_PRIORITY_NORMAL);
1103         cdai.ccb_h.func_code = XPT_DEV_ADVINFO;
1104         cdai.bufsiz = len;
1105
1106         if (!strcmp(attr, "GEOM::ident"))
1107                 cdai.buftype = CDAI_TYPE_SERIAL_NUM;
1108         else if (!strcmp(attr, "GEOM::physpath"))
1109                 cdai.buftype = CDAI_TYPE_PHYS_PATH;
1110         else if (strcmp(attr, "GEOM::lunid") == 0 ||
1111                  strcmp(attr, "GEOM::lunname") == 0) {
1112                 cdai.buftype = CDAI_TYPE_SCSI_DEVID;
1113                 cdai.bufsiz = CAM_SCSI_DEVID_MAXLEN;
1114         } else
1115                 goto out;
1116
1117         cdai.buf = malloc(cdai.bufsiz, M_CAMXPT, M_NOWAIT|M_ZERO);
1118         if (cdai.buf == NULL) {
1119                 ret = ENOMEM;
1120                 goto out;
1121         }
1122         xpt_action((union ccb *)&cdai); /* can only be synchronous */
1123         if ((cdai.ccb_h.status & CAM_DEV_QFRZN) != 0)
1124                 cam_release_devq(cdai.ccb_h.path, 0, 0, 0, FALSE);
1125         if (cdai.provsiz == 0)
1126                 goto out;
1127         if (cdai.buftype == CDAI_TYPE_SCSI_DEVID) {
1128                 if (strcmp(attr, "GEOM::lunid") == 0) {
1129                         idd = scsi_get_devid((struct scsi_vpd_device_id *)cdai.buf,
1130                             cdai.provsiz, scsi_devid_is_lun_naa);
1131                         if (idd == NULL)
1132                                 idd = scsi_get_devid((struct scsi_vpd_device_id *)cdai.buf,
1133                                     cdai.provsiz, scsi_devid_is_lun_eui64);
1134                 } else
1135                         idd = NULL;
1136                 if (idd == NULL)
1137                         idd = scsi_get_devid((struct scsi_vpd_device_id *)cdai.buf,
1138                             cdai.provsiz, scsi_devid_is_lun_t10);
1139                 if (idd == NULL)
1140                         idd = scsi_get_devid((struct scsi_vpd_device_id *)cdai.buf,
1141                             cdai.provsiz, scsi_devid_is_lun_name);
1142                 if (idd == NULL)
1143                         goto out;
1144                 ret = 0;
1145                 if ((idd->proto_codeset & SVPD_ID_CODESET_MASK) == SVPD_ID_CODESET_ASCII) {
1146                         if (idd->length < len) {
1147                                 for (l = 0; l < idd->length; l++)
1148                                         buf[l] = idd->identifier[l] ?
1149                                             idd->identifier[l] : ' ';
1150                                 buf[l] = 0;
1151                         } else
1152                                 ret = EFAULT;
1153                 } else if ((idd->proto_codeset & SVPD_ID_CODESET_MASK) == SVPD_ID_CODESET_UTF8) {
1154                         l = strnlen(idd->identifier, idd->length);
1155                         if (l < len) {
1156                                 bcopy(idd->identifier, buf, l);
1157                                 buf[l] = 0;
1158                         } else
1159                                 ret = EFAULT;
1160                 } else {
1161                         if (idd->length * 2 < len) {
1162                                 for (l = 0; l < idd->length; l++)
1163                                         sprintf(buf + l * 2, "%02x",
1164                                             idd->identifier[l]);
1165                         } else
1166                                 ret = EFAULT;
1167                 }
1168         } else {
1169                 ret = 0;
1170                 if (strlcpy(buf, cdai.buf, len) >= len)
1171                         ret = EFAULT;
1172         }
1173
1174 out:
1175         if (cdai.buf != NULL)
1176                 free(cdai.buf, M_CAMXPT);
1177         return ret;
1178 }
1179
1180 static dev_match_ret
1181 xptbusmatch(struct dev_match_pattern *patterns, u_int num_patterns,
1182             struct cam_eb *bus)
1183 {
1184         dev_match_ret retval;
1185         int i;
1186
1187         retval = DM_RET_NONE;
1188
1189         /*
1190          * If we aren't given something to match against, that's an error.
1191          */
1192         if (bus == NULL)
1193                 return(DM_RET_ERROR);
1194
1195         /*
1196          * If there are no match entries, then this bus matches no
1197          * matter what.
1198          */
1199         if ((patterns == NULL) || (num_patterns == 0))
1200                 return(DM_RET_DESCEND | DM_RET_COPY);
1201
1202         for (i = 0; i < num_patterns; i++) {
1203                 struct bus_match_pattern *cur_pattern;
1204
1205                 /*
1206                  * If the pattern in question isn't for a bus node, we
1207                  * aren't interested.  However, we do indicate to the
1208                  * calling routine that we should continue descending the
1209                  * tree, since the user wants to match against lower-level
1210                  * EDT elements.
1211                  */
1212                 if (patterns[i].type != DEV_MATCH_BUS) {
1213                         if ((retval & DM_RET_ACTION_MASK) == DM_RET_NONE)
1214                                 retval |= DM_RET_DESCEND;
1215                         continue;
1216                 }
1217
1218                 cur_pattern = &patterns[i].pattern.bus_pattern;
1219
1220                 /*
1221                  * If they want to match any bus node, we give them any
1222                  * device node.
1223                  */
1224                 if (cur_pattern->flags == BUS_MATCH_ANY) {
1225                         /* set the copy flag */
1226                         retval |= DM_RET_COPY;
1227
1228                         /*
1229                          * If we've already decided on an action, go ahead
1230                          * and return.
1231                          */
1232                         if ((retval & DM_RET_ACTION_MASK) != DM_RET_NONE)
1233                                 return(retval);
1234                 }
1235
1236                 /*
1237                  * Not sure why someone would do this...
1238                  */
1239                 if (cur_pattern->flags == BUS_MATCH_NONE)
1240                         continue;
1241
1242                 if (((cur_pattern->flags & BUS_MATCH_PATH) != 0)
1243                  && (cur_pattern->path_id != bus->path_id))
1244                         continue;
1245
1246                 if (((cur_pattern->flags & BUS_MATCH_BUS_ID) != 0)
1247                  && (cur_pattern->bus_id != bus->sim->bus_id))
1248                         continue;
1249
1250                 if (((cur_pattern->flags & BUS_MATCH_UNIT) != 0)
1251                  && (cur_pattern->unit_number != bus->sim->unit_number))
1252                         continue;
1253
1254                 if (((cur_pattern->flags & BUS_MATCH_NAME) != 0)
1255                  && (strncmp(cur_pattern->dev_name, bus->sim->sim_name,
1256                              DEV_IDLEN) != 0))
1257                         continue;
1258
1259                 /*
1260                  * If we get to this point, the user definitely wants
1261                  * information on this bus.  So tell the caller to copy the
1262                  * data out.
1263                  */
1264                 retval |= DM_RET_COPY;
1265
1266                 /*
1267                  * If the return action has been set to descend, then we
1268                  * know that we've already seen a non-bus matching
1269                  * expression, therefore we need to further descend the tree.
1270                  * This won't change by continuing around the loop, so we
1271                  * go ahead and return.  If we haven't seen a non-bus
1272                  * matching expression, we keep going around the loop until
1273                  * we exhaust the matching expressions.  We'll set the stop
1274                  * flag once we fall out of the loop.
1275                  */
1276                 if ((retval & DM_RET_ACTION_MASK) == DM_RET_DESCEND)
1277                         return(retval);
1278         }
1279
1280         /*
1281          * If the return action hasn't been set to descend yet, that means
1282          * we haven't seen anything other than bus matching patterns.  So
1283          * tell the caller to stop descending the tree -- the user doesn't
1284          * want to match against lower level tree elements.
1285          */
1286         if ((retval & DM_RET_ACTION_MASK) == DM_RET_NONE)
1287                 retval |= DM_RET_STOP;
1288
1289         return(retval);
1290 }
1291
1292 static dev_match_ret
1293 xptdevicematch(struct dev_match_pattern *patterns, u_int num_patterns,
1294                struct cam_ed *device)
1295 {
1296         dev_match_ret retval;
1297         int i;
1298
1299         retval = DM_RET_NONE;
1300
1301         /*
1302          * If we aren't given something to match against, that's an error.
1303          */
1304         if (device == NULL)
1305                 return(DM_RET_ERROR);
1306
1307         /*
1308          * If there are no match entries, then this device matches no
1309          * matter what.
1310          */
1311         if ((patterns == NULL) || (num_patterns == 0))
1312                 return(DM_RET_DESCEND | DM_RET_COPY);
1313
1314         for (i = 0; i < num_patterns; i++) {
1315                 struct device_match_pattern *cur_pattern;
1316                 struct scsi_vpd_device_id *device_id_page;
1317
1318                 /*
1319                  * If the pattern in question isn't for a device node, we
1320                  * aren't interested.
1321                  */
1322                 if (patterns[i].type != DEV_MATCH_DEVICE) {
1323                         if ((patterns[i].type == DEV_MATCH_PERIPH)
1324                          && ((retval & DM_RET_ACTION_MASK) == DM_RET_NONE))
1325                                 retval |= DM_RET_DESCEND;
1326                         continue;
1327                 }
1328
1329                 cur_pattern = &patterns[i].pattern.device_pattern;
1330
1331                 /* Error out if mutually exclusive options are specified. */
1332                 if ((cur_pattern->flags & (DEV_MATCH_INQUIRY|DEV_MATCH_DEVID))
1333                  == (DEV_MATCH_INQUIRY|DEV_MATCH_DEVID))
1334                         return(DM_RET_ERROR);
1335
1336                 /*
1337                  * If they want to match any device node, we give them any
1338                  * device node.
1339                  */
1340                 if (cur_pattern->flags == DEV_MATCH_ANY)
1341                         goto copy_dev_node;
1342
1343                 /*
1344                  * Not sure why someone would do this...
1345                  */
1346                 if (cur_pattern->flags == DEV_MATCH_NONE)
1347                         continue;
1348
1349                 if (((cur_pattern->flags & DEV_MATCH_PATH) != 0)
1350                  && (cur_pattern->path_id != device->target->bus->path_id))
1351                         continue;
1352
1353                 if (((cur_pattern->flags & DEV_MATCH_TARGET) != 0)
1354                  && (cur_pattern->target_id != device->target->target_id))
1355                         continue;
1356
1357                 if (((cur_pattern->flags & DEV_MATCH_LUN) != 0)
1358                  && (cur_pattern->target_lun != device->lun_id))
1359                         continue;
1360
1361                 if (((cur_pattern->flags & DEV_MATCH_INQUIRY) != 0)
1362                  && (cam_quirkmatch((caddr_t)&device->inq_data,
1363                                     (caddr_t)&cur_pattern->data.inq_pat,
1364                                     1, sizeof(cur_pattern->data.inq_pat),
1365                                     scsi_static_inquiry_match) == NULL))
1366                         continue;
1367
1368                 device_id_page = (struct scsi_vpd_device_id *)device->device_id;
1369                 if (((cur_pattern->flags & DEV_MATCH_DEVID) != 0)
1370                  && (device->device_id_len < SVPD_DEVICE_ID_HDR_LEN
1371                   || scsi_devid_match((uint8_t *)device_id_page->desc_list,
1372                                       device->device_id_len
1373                                     - SVPD_DEVICE_ID_HDR_LEN,
1374                                       cur_pattern->data.devid_pat.id,
1375                                       cur_pattern->data.devid_pat.id_len) != 0))
1376                         continue;
1377
1378 copy_dev_node:
1379                 /*
1380                  * If we get to this point, the user definitely wants
1381                  * information on this device.  So tell the caller to copy
1382                  * the data out.
1383                  */
1384                 retval |= DM_RET_COPY;
1385
1386                 /*
1387                  * If the return action has been set to descend, then we
1388                  * know that we've already seen a peripheral matching
1389                  * expression, therefore we need to further descend the tree.
1390                  * This won't change by continuing around the loop, so we
1391                  * go ahead and return.  If we haven't seen a peripheral
1392                  * matching expression, we keep going around the loop until
1393                  * we exhaust the matching expressions.  We'll set the stop
1394                  * flag once we fall out of the loop.
1395                  */
1396                 if ((retval & DM_RET_ACTION_MASK) == DM_RET_DESCEND)
1397                         return(retval);
1398         }
1399
1400         /*
1401          * If the return action hasn't been set to descend yet, that means
1402          * we haven't seen any peripheral matching patterns.  So tell the
1403          * caller to stop descending the tree -- the user doesn't want to
1404          * match against lower level tree elements.
1405          */
1406         if ((retval & DM_RET_ACTION_MASK) == DM_RET_NONE)
1407                 retval |= DM_RET_STOP;
1408
1409         return(retval);
1410 }
1411
1412 /*
1413  * Match a single peripheral against any number of match patterns.
1414  */
1415 static dev_match_ret
1416 xptperiphmatch(struct dev_match_pattern *patterns, u_int num_patterns,
1417                struct cam_periph *periph)
1418 {
1419         dev_match_ret retval;
1420         int i;
1421
1422         /*
1423          * If we aren't given something to match against, that's an error.
1424          */
1425         if (periph == NULL)
1426                 return(DM_RET_ERROR);
1427
1428         /*
1429          * If there are no match entries, then this peripheral matches no
1430          * matter what.
1431          */
1432         if ((patterns == NULL) || (num_patterns == 0))
1433                 return(DM_RET_STOP | DM_RET_COPY);
1434
1435         /*
1436          * There aren't any nodes below a peripheral node, so there's no
1437          * reason to descend the tree any further.
1438          */
1439         retval = DM_RET_STOP;
1440
1441         for (i = 0; i < num_patterns; i++) {
1442                 struct periph_match_pattern *cur_pattern;
1443
1444                 /*
1445                  * If the pattern in question isn't for a peripheral, we
1446                  * aren't interested.
1447                  */
1448                 if (patterns[i].type != DEV_MATCH_PERIPH)
1449                         continue;
1450
1451                 cur_pattern = &patterns[i].pattern.periph_pattern;
1452
1453                 /*
1454                  * If they want to match on anything, then we will do so.
1455                  */
1456                 if (cur_pattern->flags == PERIPH_MATCH_ANY) {
1457                         /* set the copy flag */
1458                         retval |= DM_RET_COPY;
1459
1460                         /*
1461                          * We've already set the return action to stop,
1462                          * since there are no nodes below peripherals in
1463                          * the tree.
1464                          */
1465                         return(retval);
1466                 }
1467
1468                 /*
1469                  * Not sure why someone would do this...
1470                  */
1471                 if (cur_pattern->flags == PERIPH_MATCH_NONE)
1472                         continue;
1473
1474                 if (((cur_pattern->flags & PERIPH_MATCH_PATH) != 0)
1475                  && (cur_pattern->path_id != periph->path->bus->path_id))
1476                         continue;
1477
1478                 /*
1479                  * For the target and lun id's, we have to make sure the
1480                  * target and lun pointers aren't NULL.  The xpt peripheral
1481                  * has a wildcard target and device.
1482                  */
1483                 if (((cur_pattern->flags & PERIPH_MATCH_TARGET) != 0)
1484                  && ((periph->path->target == NULL)
1485                  ||(cur_pattern->target_id != periph->path->target->target_id)))
1486                         continue;
1487
1488                 if (((cur_pattern->flags & PERIPH_MATCH_LUN) != 0)
1489                  && ((periph->path->device == NULL)
1490                  || (cur_pattern->target_lun != periph->path->device->lun_id)))
1491                         continue;
1492
1493                 if (((cur_pattern->flags & PERIPH_MATCH_UNIT) != 0)
1494                  && (cur_pattern->unit_number != periph->unit_number))
1495                         continue;
1496
1497                 if (((cur_pattern->flags & PERIPH_MATCH_NAME) != 0)
1498                  && (strncmp(cur_pattern->periph_name, periph->periph_name,
1499                              DEV_IDLEN) != 0))
1500                         continue;
1501
1502                 /*
1503                  * If we get to this point, the user definitely wants
1504                  * information on this peripheral.  So tell the caller to
1505                  * copy the data out.
1506                  */
1507                 retval |= DM_RET_COPY;
1508
1509                 /*
1510                  * The return action has already been set to stop, since
1511                  * peripherals don't have any nodes below them in the EDT.
1512                  */
1513                 return(retval);
1514         }
1515
1516         /*
1517          * If we get to this point, the peripheral that was passed in
1518          * doesn't match any of the patterns.
1519          */
1520         return(retval);
1521 }
1522
1523 static int
1524 xptedtbusfunc(struct cam_eb *bus, void *arg)
1525 {
1526         struct ccb_dev_match *cdm;
1527         struct cam_et *target;
1528         dev_match_ret retval;
1529
1530         cdm = (struct ccb_dev_match *)arg;
1531
1532         /*
1533          * If our position is for something deeper in the tree, that means
1534          * that we've already seen this node.  So, we keep going down.
1535          */
1536         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
1537          && (cdm->pos.cookie.bus == bus)
1538          && (cdm->pos.position_type & CAM_DEV_POS_TARGET)
1539          && (cdm->pos.cookie.target != NULL))
1540                 retval = DM_RET_DESCEND;
1541         else
1542                 retval = xptbusmatch(cdm->patterns, cdm->num_patterns, bus);
1543
1544         /*
1545          * If we got an error, bail out of the search.
1546          */
1547         if ((retval & DM_RET_ACTION_MASK) == DM_RET_ERROR) {
1548                 cdm->status = CAM_DEV_MATCH_ERROR;
1549                 return(0);
1550         }
1551
1552         /*
1553          * If the copy flag is set, copy this bus out.
1554          */
1555         if (retval & DM_RET_COPY) {
1556                 int spaceleft, j;
1557
1558                 spaceleft = cdm->match_buf_len - (cdm->num_matches *
1559                         sizeof(struct dev_match_result));
1560
1561                 /*
1562                  * If we don't have enough space to put in another
1563                  * match result, save our position and tell the
1564                  * user there are more devices to check.
1565                  */
1566                 if (spaceleft < sizeof(struct dev_match_result)) {
1567                         bzero(&cdm->pos, sizeof(cdm->pos));
1568                         cdm->pos.position_type =
1569                                 CAM_DEV_POS_EDT | CAM_DEV_POS_BUS;
1570
1571                         cdm->pos.cookie.bus = bus;
1572                         cdm->pos.generations[CAM_BUS_GENERATION]=
1573                                 xsoftc.bus_generation;
1574                         cdm->status = CAM_DEV_MATCH_MORE;
1575                         return(0);
1576                 }
1577                 j = cdm->num_matches;
1578                 cdm->num_matches++;
1579                 cdm->matches[j].type = DEV_MATCH_BUS;
1580                 cdm->matches[j].result.bus_result.path_id = bus->path_id;
1581                 cdm->matches[j].result.bus_result.bus_id = bus->sim->bus_id;
1582                 cdm->matches[j].result.bus_result.unit_number =
1583                         bus->sim->unit_number;
1584                 strncpy(cdm->matches[j].result.bus_result.dev_name,
1585                         bus->sim->sim_name, DEV_IDLEN);
1586         }
1587
1588         /*
1589          * If the user is only interested in busses, there's no
1590          * reason to descend to the next level in the tree.
1591          */
1592         if ((retval & DM_RET_ACTION_MASK) == DM_RET_STOP)
1593                 return(1);
1594
1595         /*
1596          * If there is a target generation recorded, check it to
1597          * make sure the target list hasn't changed.
1598          */
1599         mtx_lock(&bus->eb_mtx);
1600         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
1601          && (cdm->pos.cookie.bus == bus)
1602          && (cdm->pos.position_type & CAM_DEV_POS_TARGET)
1603          && (cdm->pos.cookie.target != NULL)) {
1604                 if ((cdm->pos.generations[CAM_TARGET_GENERATION] !=
1605                     bus->generation)) {
1606                         mtx_unlock(&bus->eb_mtx);
1607                         cdm->status = CAM_DEV_MATCH_LIST_CHANGED;
1608                         return (0);
1609                 }
1610                 target = (struct cam_et *)cdm->pos.cookie.target;
1611                 target->refcount++;
1612         } else
1613                 target = NULL;
1614         mtx_unlock(&bus->eb_mtx);
1615
1616         return (xpttargettraverse(bus, target, xptedttargetfunc, arg));
1617 }
1618
1619 static int
1620 xptedttargetfunc(struct cam_et *target, void *arg)
1621 {
1622         struct ccb_dev_match *cdm;
1623         struct cam_eb *bus;
1624         struct cam_ed *device;
1625
1626         cdm = (struct ccb_dev_match *)arg;
1627         bus = target->bus;
1628
1629         /*
1630          * If there is a device list generation recorded, check it to
1631          * make sure the device list hasn't changed.
1632          */
1633         mtx_lock(&bus->eb_mtx);
1634         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
1635          && (cdm->pos.cookie.bus == bus)
1636          && (cdm->pos.position_type & CAM_DEV_POS_TARGET)
1637          && (cdm->pos.cookie.target == target)
1638          && (cdm->pos.position_type & CAM_DEV_POS_DEVICE)
1639          && (cdm->pos.cookie.device != NULL)) {
1640                 if (cdm->pos.generations[CAM_DEV_GENERATION] !=
1641                     target->generation) {
1642                         mtx_unlock(&bus->eb_mtx);
1643                         cdm->status = CAM_DEV_MATCH_LIST_CHANGED;
1644                         return(0);
1645                 }
1646                 device = (struct cam_ed *)cdm->pos.cookie.device;
1647                 device->refcount++;
1648         } else
1649                 device = NULL;
1650         mtx_unlock(&bus->eb_mtx);
1651
1652         return (xptdevicetraverse(target, device, xptedtdevicefunc, arg));
1653 }
1654
1655 static int
1656 xptedtdevicefunc(struct cam_ed *device, void *arg)
1657 {
1658         struct cam_eb *bus;
1659         struct cam_periph *periph;
1660         struct ccb_dev_match *cdm;
1661         dev_match_ret retval;
1662
1663         cdm = (struct ccb_dev_match *)arg;
1664         bus = device->target->bus;
1665
1666         /*
1667          * If our position is for something deeper in the tree, that means
1668          * that we've already seen this node.  So, we keep going down.
1669          */
1670         if ((cdm->pos.position_type & CAM_DEV_POS_DEVICE)
1671          && (cdm->pos.cookie.device == device)
1672          && (cdm->pos.position_type & CAM_DEV_POS_PERIPH)
1673          && (cdm->pos.cookie.periph != NULL))
1674                 retval = DM_RET_DESCEND;
1675         else
1676                 retval = xptdevicematch(cdm->patterns, cdm->num_patterns,
1677                                         device);
1678
1679         if ((retval & DM_RET_ACTION_MASK) == DM_RET_ERROR) {
1680                 cdm->status = CAM_DEV_MATCH_ERROR;
1681                 return(0);
1682         }
1683
1684         /*
1685          * If the copy flag is set, copy this device out.
1686          */
1687         if (retval & DM_RET_COPY) {
1688                 int spaceleft, j;
1689
1690                 spaceleft = cdm->match_buf_len - (cdm->num_matches *
1691                         sizeof(struct dev_match_result));
1692
1693                 /*
1694                  * If we don't have enough space to put in another
1695                  * match result, save our position and tell the
1696                  * user there are more devices to check.
1697                  */
1698                 if (spaceleft < sizeof(struct dev_match_result)) {
1699                         bzero(&cdm->pos, sizeof(cdm->pos));
1700                         cdm->pos.position_type =
1701                                 CAM_DEV_POS_EDT | CAM_DEV_POS_BUS |
1702                                 CAM_DEV_POS_TARGET | CAM_DEV_POS_DEVICE;
1703
1704                         cdm->pos.cookie.bus = device->target->bus;
1705                         cdm->pos.generations[CAM_BUS_GENERATION]=
1706                                 xsoftc.bus_generation;
1707                         cdm->pos.cookie.target = device->target;
1708                         cdm->pos.generations[CAM_TARGET_GENERATION] =
1709                                 device->target->bus->generation;
1710                         cdm->pos.cookie.device = device;
1711                         cdm->pos.generations[CAM_DEV_GENERATION] =
1712                                 device->target->generation;
1713                         cdm->status = CAM_DEV_MATCH_MORE;
1714                         return(0);
1715                 }
1716                 j = cdm->num_matches;
1717                 cdm->num_matches++;
1718                 cdm->matches[j].type = DEV_MATCH_DEVICE;
1719                 cdm->matches[j].result.device_result.path_id =
1720                         device->target->bus->path_id;
1721                 cdm->matches[j].result.device_result.target_id =
1722                         device->target->target_id;
1723                 cdm->matches[j].result.device_result.target_lun =
1724                         device->lun_id;
1725                 cdm->matches[j].result.device_result.protocol =
1726                         device->protocol;
1727                 bcopy(&device->inq_data,
1728                       &cdm->matches[j].result.device_result.inq_data,
1729                       sizeof(struct scsi_inquiry_data));
1730                 bcopy(&device->ident_data,
1731                       &cdm->matches[j].result.device_result.ident_data,
1732                       sizeof(struct ata_params));
1733
1734                 /* Let the user know whether this device is unconfigured */
1735                 if (device->flags & CAM_DEV_UNCONFIGURED)
1736                         cdm->matches[j].result.device_result.flags =
1737                                 DEV_RESULT_UNCONFIGURED;
1738                 else
1739                         cdm->matches[j].result.device_result.flags =
1740                                 DEV_RESULT_NOFLAG;
1741         }
1742
1743         /*
1744          * If the user isn't interested in peripherals, don't descend
1745          * the tree any further.
1746          */
1747         if ((retval & DM_RET_ACTION_MASK) == DM_RET_STOP)
1748                 return(1);
1749
1750         /*
1751          * If there is a peripheral list generation recorded, make sure
1752          * it hasn't changed.
1753          */
1754         xpt_lock_buses();
1755         mtx_lock(&bus->eb_mtx);
1756         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
1757          && (cdm->pos.cookie.bus == bus)
1758          && (cdm->pos.position_type & CAM_DEV_POS_TARGET)
1759          && (cdm->pos.cookie.target == device->target)
1760          && (cdm->pos.position_type & CAM_DEV_POS_DEVICE)
1761          && (cdm->pos.cookie.device == device)
1762          && (cdm->pos.position_type & CAM_DEV_POS_PERIPH)
1763          && (cdm->pos.cookie.periph != NULL)) {
1764                 if (cdm->pos.generations[CAM_PERIPH_GENERATION] !=
1765                     device->generation) {
1766                         mtx_unlock(&bus->eb_mtx);
1767                         xpt_unlock_buses();
1768                         cdm->status = CAM_DEV_MATCH_LIST_CHANGED;
1769                         return(0);
1770                 }
1771                 periph = (struct cam_periph *)cdm->pos.cookie.periph;
1772                 periph->refcount++;
1773         } else
1774                 periph = NULL;
1775         mtx_unlock(&bus->eb_mtx);
1776         xpt_unlock_buses();
1777
1778         return (xptperiphtraverse(device, periph, xptedtperiphfunc, arg));
1779 }
1780
1781 static int
1782 xptedtperiphfunc(struct cam_periph *periph, void *arg)
1783 {
1784         struct ccb_dev_match *cdm;
1785         dev_match_ret retval;
1786
1787         cdm = (struct ccb_dev_match *)arg;
1788
1789         retval = xptperiphmatch(cdm->patterns, cdm->num_patterns, periph);
1790
1791         if ((retval & DM_RET_ACTION_MASK) == DM_RET_ERROR) {
1792                 cdm->status = CAM_DEV_MATCH_ERROR;
1793                 return(0);
1794         }
1795
1796         /*
1797          * If the copy flag is set, copy this peripheral out.
1798          */
1799         if (retval & DM_RET_COPY) {
1800                 int spaceleft, j;
1801
1802                 spaceleft = cdm->match_buf_len - (cdm->num_matches *
1803                         sizeof(struct dev_match_result));
1804
1805                 /*
1806                  * If we don't have enough space to put in another
1807                  * match result, save our position and tell the
1808                  * user there are more devices to check.
1809                  */
1810                 if (spaceleft < sizeof(struct dev_match_result)) {
1811                         bzero(&cdm->pos, sizeof(cdm->pos));
1812                         cdm->pos.position_type =
1813                                 CAM_DEV_POS_EDT | CAM_DEV_POS_BUS |
1814                                 CAM_DEV_POS_TARGET | CAM_DEV_POS_DEVICE |
1815                                 CAM_DEV_POS_PERIPH;
1816
1817                         cdm->pos.cookie.bus = periph->path->bus;
1818                         cdm->pos.generations[CAM_BUS_GENERATION]=
1819                                 xsoftc.bus_generation;
1820                         cdm->pos.cookie.target = periph->path->target;
1821                         cdm->pos.generations[CAM_TARGET_GENERATION] =
1822                                 periph->path->bus->generation;
1823                         cdm->pos.cookie.device = periph->path->device;
1824                         cdm->pos.generations[CAM_DEV_GENERATION] =
1825                                 periph->path->target->generation;
1826                         cdm->pos.cookie.periph = periph;
1827                         cdm->pos.generations[CAM_PERIPH_GENERATION] =
1828                                 periph->path->device->generation;
1829                         cdm->status = CAM_DEV_MATCH_MORE;
1830                         return(0);
1831                 }
1832
1833                 j = cdm->num_matches;
1834                 cdm->num_matches++;
1835                 cdm->matches[j].type = DEV_MATCH_PERIPH;
1836                 cdm->matches[j].result.periph_result.path_id =
1837                         periph->path->bus->path_id;
1838                 cdm->matches[j].result.periph_result.target_id =
1839                         periph->path->target->target_id;
1840                 cdm->matches[j].result.periph_result.target_lun =
1841                         periph->path->device->lun_id;
1842                 cdm->matches[j].result.periph_result.unit_number =
1843                         periph->unit_number;
1844                 strncpy(cdm->matches[j].result.periph_result.periph_name,
1845                         periph->periph_name, DEV_IDLEN);
1846         }
1847
1848         return(1);
1849 }
1850
1851 static int
1852 xptedtmatch(struct ccb_dev_match *cdm)
1853 {
1854         struct cam_eb *bus;
1855         int ret;
1856
1857         cdm->num_matches = 0;
1858
1859         /*
1860          * Check the bus list generation.  If it has changed, the user
1861          * needs to reset everything and start over.
1862          */
1863         xpt_lock_buses();
1864         if ((cdm->pos.position_type & CAM_DEV_POS_BUS)
1865          && (cdm->pos.cookie.bus != NULL)) {
1866                 if (cdm->pos.generations[CAM_BUS_GENERATION] !=
1867                     xsoftc.bus_generation) {
1868                         xpt_unlock_buses();
1869                         cdm->status = CAM_DEV_MATCH_LIST_CHANGED;
1870                         return(0);
1871                 }
1872                 bus = (struct cam_eb *)cdm->pos.cookie.bus;
1873                 bus->refcount++;
1874         } else
1875                 bus = NULL;
1876         xpt_unlock_buses();
1877
1878         ret = xptbustraverse(bus, xptedtbusfunc, cdm);
1879
1880         /*
1881          * If we get back 0, that means that we had to stop before fully
1882          * traversing the EDT.  It also means that one of the subroutines
1883          * has set the status field to the proper value.  If we get back 1,
1884          * we've fully traversed the EDT and copied out any matching entries.
1885          */
1886         if (ret == 1)
1887                 cdm->status = CAM_DEV_MATCH_LAST;
1888
1889         return(ret);
1890 }
1891
1892 static int
1893 xptplistpdrvfunc(struct periph_driver **pdrv, void *arg)
1894 {
1895         struct cam_periph *periph;
1896         struct ccb_dev_match *cdm;
1897
1898         cdm = (struct ccb_dev_match *)arg;
1899
1900         xpt_lock_buses();
1901         if ((cdm->pos.position_type & CAM_DEV_POS_PDPTR)
1902          && (cdm->pos.cookie.pdrv == pdrv)
1903          && (cdm->pos.position_type & CAM_DEV_POS_PERIPH)
1904          && (cdm->pos.cookie.periph != NULL)) {
1905                 if (cdm->pos.generations[CAM_PERIPH_GENERATION] !=
1906                     (*pdrv)->generation) {
1907                         xpt_unlock_buses();
1908                         cdm->status = CAM_DEV_MATCH_LIST_CHANGED;
1909                         return(0);
1910                 }
1911                 periph = (struct cam_periph *)cdm->pos.cookie.periph;
1912                 periph->refcount++;
1913         } else
1914                 periph = NULL;
1915         xpt_unlock_buses();
1916
1917         return (xptpdperiphtraverse(pdrv, periph, xptplistperiphfunc, arg));
1918 }
1919
1920 static int
1921 xptplistperiphfunc(struct cam_periph *periph, void *arg)
1922 {
1923         struct ccb_dev_match *cdm;
1924         dev_match_ret retval;
1925
1926         cdm = (struct ccb_dev_match *)arg;
1927
1928         retval = xptperiphmatch(cdm->patterns, cdm->num_patterns, periph);
1929
1930         if ((retval & DM_RET_ACTION_MASK) == DM_RET_ERROR) {
1931                 cdm->status = CAM_DEV_MATCH_ERROR;
1932                 return(0);
1933         }
1934
1935         /*
1936          * If the copy flag is set, copy this peripheral out.
1937          */
1938         if (retval & DM_RET_COPY) {
1939                 int spaceleft, j;
1940
1941                 spaceleft = cdm->match_buf_len - (cdm->num_matches *
1942                         sizeof(struct dev_match_result));
1943
1944                 /*
1945                  * If we don't have enough space to put in another
1946                  * match result, save our position and tell the
1947                  * user there are more devices to check.
1948                  */
1949                 if (spaceleft < sizeof(struct dev_match_result)) {
1950                         struct periph_driver **pdrv;
1951
1952                         pdrv = NULL;
1953                         bzero(&cdm->pos, sizeof(cdm->pos));
1954                         cdm->pos.position_type =
1955                                 CAM_DEV_POS_PDRV | CAM_DEV_POS_PDPTR |
1956                                 CAM_DEV_POS_PERIPH;
1957
1958                         /*
1959                          * This may look a bit non-sensical, but it is
1960                          * actually quite logical.  There are very few
1961                          * peripheral drivers, and bloating every peripheral
1962                          * structure with a pointer back to its parent
1963                          * peripheral driver linker set entry would cost
1964                          * more in the long run than doing this quick lookup.
1965                          */
1966                         for (pdrv = periph_drivers; *pdrv != NULL; pdrv++) {
1967                                 if (strcmp((*pdrv)->driver_name,
1968                                     periph->periph_name) == 0)
1969                                         break;
1970                         }
1971
1972                         if (*pdrv == NULL) {
1973                                 cdm->status = CAM_DEV_MATCH_ERROR;
1974                                 return(0);
1975                         }
1976
1977                         cdm->pos.cookie.pdrv = pdrv;
1978                         /*
1979                          * The periph generation slot does double duty, as
1980                          * does the periph pointer slot.  They are used for
1981                          * both edt and pdrv lookups and positioning.
1982                          */
1983                         cdm->pos.cookie.periph = periph;
1984                         cdm->pos.generations[CAM_PERIPH_GENERATION] =
1985                                 (*pdrv)->generation;
1986                         cdm->status = CAM_DEV_MATCH_MORE;
1987                         return(0);
1988                 }
1989
1990                 j = cdm->num_matches;
1991                 cdm->num_matches++;
1992                 cdm->matches[j].type = DEV_MATCH_PERIPH;
1993                 cdm->matches[j].result.periph_result.path_id =
1994                         periph->path->bus->path_id;
1995
1996                 /*
1997                  * The transport layer peripheral doesn't have a target or
1998                  * lun.
1999                  */
2000                 if (periph->path->target)
2001                         cdm->matches[j].result.periph_result.target_id =
2002                                 periph->path->target->target_id;
2003                 else
2004                         cdm->matches[j].result.periph_result.target_id =
2005                                 CAM_TARGET_WILDCARD;
2006
2007                 if (periph->path->device)
2008                         cdm->matches[j].result.periph_result.target_lun =
2009                                 periph->path->device->lun_id;
2010                 else
2011                         cdm->matches[j].result.periph_result.target_lun =
2012                                 CAM_LUN_WILDCARD;
2013
2014                 cdm->matches[j].result.periph_result.unit_number =
2015                         periph->unit_number;
2016                 strncpy(cdm->matches[j].result.periph_result.periph_name,
2017                         periph->periph_name, DEV_IDLEN);
2018         }
2019
2020         return(1);
2021 }
2022
2023 static int
2024 xptperiphlistmatch(struct ccb_dev_match *cdm)
2025 {
2026         int ret;
2027
2028         cdm->num_matches = 0;
2029
2030         /*
2031          * At this point in the edt traversal function, we check the bus
2032          * list generation to make sure that no busses have been added or
2033          * removed since the user last sent a XPT_DEV_MATCH ccb through.
2034          * For the peripheral driver list traversal function, however, we
2035          * don't have to worry about new peripheral driver types coming or
2036          * going; they're in a linker set, and therefore can't change
2037          * without a recompile.
2038          */
2039
2040         if ((cdm->pos.position_type & CAM_DEV_POS_PDPTR)
2041          && (cdm->pos.cookie.pdrv != NULL))
2042                 ret = xptpdrvtraverse(
2043                                 (struct periph_driver **)cdm->pos.cookie.pdrv,
2044                                 xptplistpdrvfunc, cdm);
2045         else
2046                 ret = xptpdrvtraverse(NULL, xptplistpdrvfunc, cdm);
2047
2048         /*
2049          * If we get back 0, that means that we had to stop before fully
2050          * traversing the peripheral driver tree.  It also means that one of
2051          * the subroutines has set the status field to the proper value.  If
2052          * we get back 1, we've fully traversed the EDT and copied out any
2053          * matching entries.
2054          */
2055         if (ret == 1)
2056                 cdm->status = CAM_DEV_MATCH_LAST;
2057
2058         return(ret);
2059 }
2060
2061 static int
2062 xptbustraverse(struct cam_eb *start_bus, xpt_busfunc_t *tr_func, void *arg)
2063 {
2064         struct cam_eb *bus, *next_bus;
2065         int retval;
2066
2067         retval = 1;
2068         if (start_bus)
2069                 bus = start_bus;
2070         else {
2071                 xpt_lock_buses();
2072                 bus = TAILQ_FIRST(&xsoftc.xpt_busses);
2073                 if (bus == NULL) {
2074                         xpt_unlock_buses();
2075                         return (retval);
2076                 }
2077                 bus->refcount++;
2078                 xpt_unlock_buses();
2079         }
2080         for (; bus != NULL; bus = next_bus) {
2081                 retval = tr_func(bus, arg);
2082                 if (retval == 0) {
2083                         xpt_release_bus(bus);
2084                         break;
2085                 }
2086                 xpt_lock_buses();
2087                 next_bus = TAILQ_NEXT(bus, links);
2088                 if (next_bus)
2089                         next_bus->refcount++;
2090                 xpt_unlock_buses();
2091                 xpt_release_bus(bus);
2092         }
2093         return(retval);
2094 }
2095
2096 static int
2097 xpttargettraverse(struct cam_eb *bus, struct cam_et *start_target,
2098                   xpt_targetfunc_t *tr_func, void *arg)
2099 {
2100         struct cam_et *target, *next_target;
2101         int retval;
2102
2103         retval = 1;
2104         if (start_target)
2105                 target = start_target;
2106         else {
2107                 mtx_lock(&bus->eb_mtx);
2108                 target = TAILQ_FIRST(&bus->et_entries);
2109                 if (target == NULL) {
2110                         mtx_unlock(&bus->eb_mtx);
2111                         return (retval);
2112                 }
2113                 target->refcount++;
2114                 mtx_unlock(&bus->eb_mtx);
2115         }
2116         for (; target != NULL; target = next_target) {
2117                 retval = tr_func(target, arg);
2118                 if (retval == 0) {
2119                         xpt_release_target(target);
2120                         break;
2121                 }
2122                 mtx_lock(&bus->eb_mtx);
2123                 next_target = TAILQ_NEXT(target, links);
2124                 if (next_target)
2125                         next_target->refcount++;
2126                 mtx_unlock(&bus->eb_mtx);
2127                 xpt_release_target(target);
2128         }
2129         return(retval);
2130 }
2131
2132 static int
2133 xptdevicetraverse(struct cam_et *target, struct cam_ed *start_device,
2134                   xpt_devicefunc_t *tr_func, void *arg)
2135 {
2136         struct cam_eb *bus;
2137         struct cam_ed *device, *next_device;
2138         int retval;
2139
2140         retval = 1;
2141         bus = target->bus;
2142         if (start_device)
2143                 device = start_device;
2144         else {
2145                 mtx_lock(&bus->eb_mtx);
2146                 device = TAILQ_FIRST(&target->ed_entries);
2147                 if (device == NULL) {
2148                         mtx_unlock(&bus->eb_mtx);
2149                         return (retval);
2150                 }
2151                 device->refcount++;
2152                 mtx_unlock(&bus->eb_mtx);
2153         }
2154         for (; device != NULL; device = next_device) {
2155                 mtx_lock(&device->device_mtx);
2156                 retval = tr_func(device, arg);
2157                 mtx_unlock(&device->device_mtx);
2158                 if (retval == 0) {
2159                         xpt_release_device(device);
2160                         break;
2161                 }
2162                 mtx_lock(&bus->eb_mtx);
2163                 next_device = TAILQ_NEXT(device, links);
2164                 if (next_device)
2165                         next_device->refcount++;
2166                 mtx_unlock(&bus->eb_mtx);
2167                 xpt_release_device(device);
2168         }
2169         return(retval);
2170 }
2171
2172 static int
2173 xptperiphtraverse(struct cam_ed *device, struct cam_periph *start_periph,
2174                   xpt_periphfunc_t *tr_func, void *arg)
2175 {
2176         struct cam_eb *bus;
2177         struct cam_periph *periph, *next_periph;
2178         int retval;
2179
2180         retval = 1;
2181
2182         bus = device->target->bus;
2183         if (start_periph)
2184                 periph = start_periph;
2185         else {
2186                 xpt_lock_buses();
2187                 mtx_lock(&bus->eb_mtx);
2188                 periph = SLIST_FIRST(&device->periphs);
2189                 while (periph != NULL && (periph->flags & CAM_PERIPH_FREE) != 0)
2190                         periph = SLIST_NEXT(periph, periph_links);
2191                 if (periph == NULL) {
2192                         mtx_unlock(&bus->eb_mtx);
2193                         xpt_unlock_buses();
2194                         return (retval);
2195                 }
2196                 periph->refcount++;
2197                 mtx_unlock(&bus->eb_mtx);
2198                 xpt_unlock_buses();
2199         }
2200         for (; periph != NULL; periph = next_periph) {
2201                 retval = tr_func(periph, arg);
2202                 if (retval == 0) {
2203                         cam_periph_release_locked(periph);
2204                         break;
2205                 }
2206                 xpt_lock_buses();
2207                 mtx_lock(&bus->eb_mtx);
2208                 next_periph = SLIST_NEXT(periph, periph_links);
2209                 while (next_periph != NULL &&
2210                     (next_periph->flags & CAM_PERIPH_FREE) != 0)
2211                         next_periph = SLIST_NEXT(next_periph, periph_links);
2212                 if (next_periph)
2213                         next_periph->refcount++;
2214                 mtx_unlock(&bus->eb_mtx);
2215                 xpt_unlock_buses();
2216                 cam_periph_release_locked(periph);
2217         }
2218         return(retval);
2219 }
2220
2221 static int
2222 xptpdrvtraverse(struct periph_driver **start_pdrv,
2223                 xpt_pdrvfunc_t *tr_func, void *arg)
2224 {
2225         struct periph_driver **pdrv;
2226         int retval;
2227
2228         retval = 1;
2229
2230         /*
2231          * We don't traverse the peripheral driver list like we do the
2232          * other lists, because it is a linker set, and therefore cannot be
2233          * changed during runtime.  If the peripheral driver list is ever
2234          * re-done to be something other than a linker set (i.e. it can
2235          * change while the system is running), the list traversal should
2236          * be modified to work like the other traversal functions.
2237          */
2238         for (pdrv = (start_pdrv ? start_pdrv : periph_drivers);
2239              *pdrv != NULL; pdrv++) {
2240                 retval = tr_func(pdrv, arg);
2241
2242                 if (retval == 0)
2243                         return(retval);
2244         }
2245
2246         return(retval);
2247 }
2248
2249 static int
2250 xptpdperiphtraverse(struct periph_driver **pdrv,
2251                     struct cam_periph *start_periph,
2252                     xpt_periphfunc_t *tr_func, void *arg)
2253 {
2254         struct cam_periph *periph, *next_periph;
2255         int retval;
2256
2257         retval = 1;
2258
2259         if (start_periph)
2260                 periph = start_periph;
2261         else {
2262                 xpt_lock_buses();
2263                 periph = TAILQ_FIRST(&(*pdrv)->units);
2264                 while (periph != NULL && (periph->flags & CAM_PERIPH_FREE) != 0)
2265                         periph = TAILQ_NEXT(periph, unit_links);
2266                 if (periph == NULL) {
2267                         xpt_unlock_buses();
2268                         return (retval);
2269                 }
2270                 periph->refcount++;
2271                 xpt_unlock_buses();
2272         }
2273         for (; periph != NULL; periph = next_periph) {
2274                 cam_periph_lock(periph);
2275                 retval = tr_func(periph, arg);
2276                 cam_periph_unlock(periph);
2277                 if (retval == 0) {
2278                         cam_periph_release(periph);
2279                         break;
2280                 }
2281                 xpt_lock_buses();
2282                 next_periph = TAILQ_NEXT(periph, unit_links);
2283                 while (next_periph != NULL &&
2284                     (next_periph->flags & CAM_PERIPH_FREE) != 0)
2285                         next_periph = TAILQ_NEXT(next_periph, unit_links);
2286                 if (next_periph)
2287                         next_periph->refcount++;
2288                 xpt_unlock_buses();
2289                 cam_periph_release(periph);
2290         }
2291         return(retval);
2292 }
2293
2294 static int
2295 xptdefbusfunc(struct cam_eb *bus, void *arg)
2296 {
2297         struct xpt_traverse_config *tr_config;
2298
2299         tr_config = (struct xpt_traverse_config *)arg;
2300
2301         if (tr_config->depth == XPT_DEPTH_BUS) {
2302                 xpt_busfunc_t *tr_func;
2303
2304                 tr_func = (xpt_busfunc_t *)tr_config->tr_func;
2305
2306                 return(tr_func(bus, tr_config->tr_arg));
2307         } else
2308                 return(xpttargettraverse(bus, NULL, xptdeftargetfunc, arg));
2309 }
2310
2311 static int
2312 xptdeftargetfunc(struct cam_et *target, void *arg)
2313 {
2314         struct xpt_traverse_config *tr_config;
2315
2316         tr_config = (struct xpt_traverse_config *)arg;
2317
2318         if (tr_config->depth == XPT_DEPTH_TARGET) {
2319                 xpt_targetfunc_t *tr_func;
2320
2321                 tr_func = (xpt_targetfunc_t *)tr_config->tr_func;
2322
2323                 return(tr_func(target, tr_config->tr_arg));
2324         } else
2325                 return(xptdevicetraverse(target, NULL, xptdefdevicefunc, arg));
2326 }
2327
2328 static int
2329 xptdefdevicefunc(struct cam_ed *device, void *arg)
2330 {
2331         struct xpt_traverse_config *tr_config;
2332
2333         tr_config = (struct xpt_traverse_config *)arg;
2334
2335         if (tr_config->depth == XPT_DEPTH_DEVICE) {
2336                 xpt_devicefunc_t *tr_func;
2337
2338                 tr_func = (xpt_devicefunc_t *)tr_config->tr_func;
2339
2340                 return(tr_func(device, tr_config->tr_arg));
2341         } else
2342                 return(xptperiphtraverse(device, NULL, xptdefperiphfunc, arg));
2343 }
2344
2345 static int
2346 xptdefperiphfunc(struct cam_periph *periph, void *arg)
2347 {
2348         struct xpt_traverse_config *tr_config;
2349         xpt_periphfunc_t *tr_func;
2350
2351         tr_config = (struct xpt_traverse_config *)arg;
2352
2353         tr_func = (xpt_periphfunc_t *)tr_config->tr_func;
2354
2355         /*
2356          * Unlike the other default functions, we don't check for depth
2357          * here.  The peripheral driver level is the last level in the EDT,
2358          * so if we're here, we should execute the function in question.
2359          */
2360         return(tr_func(periph, tr_config->tr_arg));
2361 }
2362
2363 /*
2364  * Execute the given function for every bus in the EDT.
2365  */
2366 static int
2367 xpt_for_all_busses(xpt_busfunc_t *tr_func, void *arg)
2368 {
2369         struct xpt_traverse_config tr_config;
2370
2371         tr_config.depth = XPT_DEPTH_BUS;
2372         tr_config.tr_func = tr_func;
2373         tr_config.tr_arg = arg;
2374
2375         return(xptbustraverse(NULL, xptdefbusfunc, &tr_config));
2376 }
2377
2378 /*
2379  * Execute the given function for every device in the EDT.
2380  */
2381 static int
2382 xpt_for_all_devices(xpt_devicefunc_t *tr_func, void *arg)
2383 {
2384         struct xpt_traverse_config tr_config;
2385
2386         tr_config.depth = XPT_DEPTH_DEVICE;
2387         tr_config.tr_func = tr_func;
2388         tr_config.tr_arg = arg;
2389
2390         return(xptbustraverse(NULL, xptdefbusfunc, &tr_config));
2391 }
2392
2393 static int
2394 xptsetasyncfunc(struct cam_ed *device, void *arg)
2395 {
2396         struct cam_path path;
2397         struct ccb_getdev cgd;
2398         struct ccb_setasync *csa = (struct ccb_setasync *)arg;
2399
2400         /*
2401          * Don't report unconfigured devices (Wildcard devs,
2402          * devices only for target mode, device instances
2403          * that have been invalidated but are waiting for
2404          * their last reference count to be released).
2405          */
2406         if ((device->flags & CAM_DEV_UNCONFIGURED) != 0)
2407                 return (1);
2408
2409         xpt_compile_path(&path,
2410                          NULL,
2411                          device->target->bus->path_id,
2412                          device->target->target_id,
2413                          device->lun_id);
2414         xpt_setup_ccb(&cgd.ccb_h, &path, CAM_PRIORITY_NORMAL);
2415         cgd.ccb_h.func_code = XPT_GDEV_TYPE;
2416         xpt_action((union ccb *)&cgd);
2417         csa->callback(csa->callback_arg,
2418                             AC_FOUND_DEVICE,
2419                             &path, &cgd);
2420         xpt_release_path(&path);
2421
2422         return(1);
2423 }
2424
2425 static int
2426 xptsetasyncbusfunc(struct cam_eb *bus, void *arg)
2427 {
2428         struct cam_path path;
2429         struct ccb_pathinq cpi;
2430         struct ccb_setasync *csa = (struct ccb_setasync *)arg;
2431
2432         xpt_compile_path(&path, /*periph*/NULL,
2433                          bus->path_id,
2434                          CAM_TARGET_WILDCARD,
2435                          CAM_LUN_WILDCARD);
2436         xpt_path_lock(&path);
2437         xpt_setup_ccb(&cpi.ccb_h, &path, CAM_PRIORITY_NORMAL);
2438         cpi.ccb_h.func_code = XPT_PATH_INQ;
2439         xpt_action((union ccb *)&cpi);
2440         csa->callback(csa->callback_arg,
2441                             AC_PATH_REGISTERED,
2442                             &path, &cpi);
2443         xpt_path_unlock(&path);
2444         xpt_release_path(&path);
2445
2446         return(1);
2447 }
2448
2449 void
2450 xpt_action(union ccb *start_ccb)
2451 {
2452
2453         CAM_DEBUG(start_ccb->ccb_h.path, CAM_DEBUG_TRACE,
2454             ("xpt_action: func=%#x\n", start_ccb->ccb_h.func_code));
2455
2456         start_ccb->ccb_h.status = CAM_REQ_INPROG;
2457         (*(start_ccb->ccb_h.path->bus->xport->action))(start_ccb);
2458 }
2459
2460 void
2461 xpt_action_default(union ccb *start_ccb)
2462 {
2463         struct cam_path *path;
2464         struct cam_sim *sim;
2465         int lock;
2466
2467         path = start_ccb->ccb_h.path;
2468         CAM_DEBUG(path, CAM_DEBUG_TRACE,
2469             ("xpt_action_default: func=%#x\n", start_ccb->ccb_h.func_code));
2470
2471         switch (start_ccb->ccb_h.func_code) {
2472         case XPT_SCSI_IO:
2473         {
2474                 struct cam_ed *device;
2475
2476                 /*
2477                  * For the sake of compatibility with SCSI-1
2478                  * devices that may not understand the identify
2479                  * message, we include lun information in the
2480                  * second byte of all commands.  SCSI-1 specifies
2481                  * that luns are a 3 bit value and reserves only 3
2482                  * bits for lun information in the CDB.  Later
2483                  * revisions of the SCSI spec allow for more than 8
2484                  * luns, but have deprecated lun information in the
2485                  * CDB.  So, if the lun won't fit, we must omit.
2486                  *
2487                  * Also be aware that during initial probing for devices,
2488                  * the inquiry information is unknown but initialized to 0.
2489                  * This means that this code will be exercised while probing
2490                  * devices with an ANSI revision greater than 2.
2491                  */
2492                 device = path->device;
2493                 if (device->protocol_version <= SCSI_REV_2
2494                  && start_ccb->ccb_h.target_lun < 8
2495                  && (start_ccb->ccb_h.flags & CAM_CDB_POINTER) == 0) {
2496
2497                         start_ccb->csio.cdb_io.cdb_bytes[1] |=
2498                             start_ccb->ccb_h.target_lun << 5;
2499                 }
2500                 start_ccb->csio.scsi_status = SCSI_STATUS_OK;
2501         }
2502         /* FALLTHROUGH */
2503         case XPT_TARGET_IO:
2504         case XPT_CONT_TARGET_IO:
2505                 start_ccb->csio.sense_resid = 0;
2506                 start_ccb->csio.resid = 0;
2507                 /* FALLTHROUGH */
2508         case XPT_ATA_IO:
2509                 if (start_ccb->ccb_h.func_code == XPT_ATA_IO)
2510                         start_ccb->ataio.resid = 0;
2511                 /* FALLTHROUGH */
2512         case XPT_RESET_DEV:
2513         case XPT_ENG_EXEC:
2514         case XPT_SMP_IO:
2515         {
2516                 struct cam_devq *devq;
2517
2518                 devq = path->bus->sim->devq;
2519                 mtx_lock(&devq->send_mtx);
2520                 cam_ccbq_insert_ccb(&path->device->ccbq, start_ccb);
2521                 if (xpt_schedule_devq(devq, path->device) != 0)
2522                         xpt_run_devq(devq);
2523                 mtx_unlock(&devq->send_mtx);
2524                 break;
2525         }
2526         case XPT_CALC_GEOMETRY:
2527                 /* Filter out garbage */
2528                 if (start_ccb->ccg.block_size == 0
2529                  || start_ccb->ccg.volume_size == 0) {
2530                         start_ccb->ccg.cylinders = 0;
2531                         start_ccb->ccg.heads = 0;
2532                         start_ccb->ccg.secs_per_track = 0;
2533                         start_ccb->ccb_h.status = CAM_REQ_CMP;
2534                         break;
2535                 }
2536 #if defined(PC98) || defined(__sparc64__)
2537                 /*
2538                  * In a PC-98 system, geometry translation depens on
2539                  * the "real" device geometry obtained from mode page 4.
2540                  * SCSI geometry translation is performed in the
2541                  * initialization routine of the SCSI BIOS and the result
2542                  * stored in host memory.  If the translation is available
2543                  * in host memory, use it.  If not, rely on the default
2544                  * translation the device driver performs.
2545                  * For sparc64, we may need adjust the geometry of large
2546                  * disks in order to fit the limitations of the 16-bit
2547                  * fields of the VTOC8 disk label.
2548                  */
2549                 if (scsi_da_bios_params(&start_ccb->ccg) != 0) {
2550                         start_ccb->ccb_h.status = CAM_REQ_CMP;
2551                         break;
2552                 }
2553 #endif
2554                 goto call_sim;
2555         case XPT_ABORT:
2556         {
2557                 union ccb* abort_ccb;
2558
2559                 abort_ccb = start_ccb->cab.abort_ccb;
2560                 if (XPT_FC_IS_DEV_QUEUED(abort_ccb)) {
2561
2562                         if (abort_ccb->ccb_h.pinfo.index >= 0) {
2563                                 struct cam_ccbq *ccbq;
2564                                 struct cam_ed *device;
2565
2566                                 device = abort_ccb->ccb_h.path->device;
2567                                 ccbq = &device->ccbq;
2568                                 cam_ccbq_remove_ccb(ccbq, abort_ccb);
2569                                 abort_ccb->ccb_h.status =
2570                                     CAM_REQ_ABORTED|CAM_DEV_QFRZN;
2571                                 xpt_freeze_devq(abort_ccb->ccb_h.path, 1);
2572                                 xpt_done(abort_ccb);
2573                                 start_ccb->ccb_h.status = CAM_REQ_CMP;
2574                                 break;
2575                         }
2576                         if (abort_ccb->ccb_h.pinfo.index == CAM_UNQUEUED_INDEX
2577                          && (abort_ccb->ccb_h.status & CAM_SIM_QUEUED) == 0) {
2578                                 /*
2579                                  * We've caught this ccb en route to
2580                                  * the SIM.  Flag it for abort and the
2581                                  * SIM will do so just before starting
2582                                  * real work on the CCB.
2583                                  */
2584                                 abort_ccb->ccb_h.status =
2585                                     CAM_REQ_ABORTED|CAM_DEV_QFRZN;
2586                                 xpt_freeze_devq(abort_ccb->ccb_h.path, 1);
2587                                 start_ccb->ccb_h.status = CAM_REQ_CMP;
2588                                 break;
2589                         }
2590                 }
2591                 if (XPT_FC_IS_QUEUED(abort_ccb)
2592                  && (abort_ccb->ccb_h.pinfo.index == CAM_DONEQ_INDEX)) {
2593                         /*
2594                          * It's already completed but waiting
2595                          * for our SWI to get to it.
2596                          */
2597                         start_ccb->ccb_h.status = CAM_UA_ABORT;
2598                         break;
2599                 }
2600                 /*
2601                  * If we weren't able to take care of the abort request
2602                  * in the XPT, pass the request down to the SIM for processing.
2603                  */
2604         }
2605         /* FALLTHROUGH */
2606         case XPT_ACCEPT_TARGET_IO:
2607         case XPT_EN_LUN:
2608         case XPT_IMMED_NOTIFY:
2609         case XPT_NOTIFY_ACK:
2610         case XPT_RESET_BUS:
2611         case XPT_IMMEDIATE_NOTIFY:
2612         case XPT_NOTIFY_ACKNOWLEDGE:
2613         case XPT_GET_SIM_KNOB:
2614         case XPT_SET_SIM_KNOB:
2615         case XPT_GET_TRAN_SETTINGS:
2616         case XPT_SET_TRAN_SETTINGS:
2617         case XPT_PATH_INQ:
2618 call_sim:
2619                 sim = path->bus->sim;
2620                 lock = (mtx_owned(sim->mtx) == 0);
2621                 if (lock)
2622                         CAM_SIM_LOCK(sim);
2623                 CAM_DEBUG(path, CAM_DEBUG_TRACE,
2624                     ("sim->sim_action: func=%#x\n", start_ccb->ccb_h.func_code));
2625                 (*(sim->sim_action))(sim, start_ccb);
2626                 CAM_DEBUG(path, CAM_DEBUG_TRACE,
2627                     ("sim->sim_action: status=%#x\n", start_ccb->ccb_h.status));
2628                 if (lock)
2629                         CAM_SIM_UNLOCK(sim);
2630                 break;
2631         case XPT_PATH_STATS:
2632                 start_ccb->cpis.last_reset = path->bus->last_reset;
2633                 start_ccb->ccb_h.status = CAM_REQ_CMP;
2634                 break;
2635         case XPT_GDEV_TYPE:
2636         {
2637                 struct cam_ed *dev;
2638
2639                 dev = path->device;
2640                 if ((dev->flags & CAM_DEV_UNCONFIGURED) != 0) {
2641                         start_ccb->ccb_h.status = CAM_DEV_NOT_THERE;
2642                 } else {
2643                         struct ccb_getdev *cgd;
2644
2645                         cgd = &start_ccb->cgd;
2646                         cgd->protocol = dev->protocol;
2647                         cgd->inq_data = dev->inq_data;
2648                         cgd->ident_data = dev->ident_data;
2649                         cgd->inq_flags = dev->inq_flags;
2650                         cgd->ccb_h.status = CAM_REQ_CMP;
2651                         cgd->serial_num_len = dev->serial_num_len;
2652                         if ((dev->serial_num_len > 0)
2653                          && (dev->serial_num != NULL))
2654                                 bcopy(dev->serial_num, cgd->serial_num,
2655                                       dev->serial_num_len);
2656                 }
2657                 break;
2658         }
2659         case XPT_GDEV_STATS:
2660         {
2661                 struct cam_ed *dev;
2662
2663                 dev = path->device;
2664                 if ((dev->flags & CAM_DEV_UNCONFIGURED) != 0) {
2665                         start_ccb->ccb_h.status = CAM_DEV_NOT_THERE;
2666                 } else {
2667                         struct ccb_getdevstats *cgds;
2668                         struct cam_eb *bus;
2669                         struct cam_et *tar;
2670                         struct cam_devq *devq;
2671
2672                         cgds = &start_ccb->cgds;
2673                         bus = path->bus;
2674                         tar = path->target;
2675                         devq = bus->sim->devq;
2676                         mtx_lock(&devq->send_mtx);
2677                         cgds->dev_openings = dev->ccbq.dev_openings;
2678                         cgds->dev_active = dev->ccbq.dev_active;
2679                         cgds->allocated = dev->ccbq.allocated;
2680                         cgds->queued = cam_ccbq_pending_ccb_count(&dev->ccbq);
2681                         cgds->held = cgds->allocated - cgds->dev_active -
2682                             cgds->queued;
2683                         cgds->last_reset = tar->last_reset;
2684                         cgds->maxtags = dev->maxtags;
2685                         cgds->mintags = dev->mintags;
2686                         if (timevalcmp(&tar->last_reset, &bus->last_reset, <))
2687                                 cgds->last_reset = bus->last_reset;
2688                         mtx_unlock(&devq->send_mtx);
2689                         cgds->ccb_h.status = CAM_REQ_CMP;
2690                 }
2691                 break;
2692         }
2693         case XPT_GDEVLIST:
2694         {
2695                 struct cam_periph       *nperiph;
2696                 struct periph_list      *periph_head;
2697                 struct ccb_getdevlist   *cgdl;
2698                 u_int                   i;
2699                 struct cam_ed           *device;
2700                 int                     found;
2701
2702
2703                 found = 0;
2704
2705                 /*
2706                  * Don't want anyone mucking with our data.
2707                  */
2708                 device = path->device;
2709                 periph_head = &device->periphs;
2710                 cgdl = &start_ccb->cgdl;
2711
2712                 /*
2713                  * Check and see if the list has changed since the user
2714                  * last requested a list member.  If so, tell them that the
2715                  * list has changed, and therefore they need to start over
2716                  * from the beginning.
2717                  */
2718                 if ((cgdl->index != 0) &&
2719                     (cgdl->generation != device->generation)) {
2720                         cgdl->status = CAM_GDEVLIST_LIST_CHANGED;
2721                         break;
2722                 }
2723
2724                 /*
2725                  * Traverse the list of peripherals and attempt to find
2726                  * the requested peripheral.
2727                  */
2728                 for (nperiph = SLIST_FIRST(periph_head), i = 0;
2729                      (nperiph != NULL) && (i <= cgdl->index);
2730                      nperiph = SLIST_NEXT(nperiph, periph_links), i++) {
2731                         if (i == cgdl->index) {
2732                                 strncpy(cgdl->periph_name,
2733                                         nperiph->periph_name,
2734                                         DEV_IDLEN);
2735                                 cgdl->unit_number = nperiph->unit_number;
2736                                 found = 1;
2737                         }
2738                 }
2739                 if (found == 0) {
2740                         cgdl->status = CAM_GDEVLIST_ERROR;
2741                         break;
2742                 }
2743
2744                 if (nperiph == NULL)
2745                         cgdl->status = CAM_GDEVLIST_LAST_DEVICE;
2746                 else
2747                         cgdl->status = CAM_GDEVLIST_MORE_DEVS;
2748
2749                 cgdl->index++;
2750                 cgdl->generation = device->generation;
2751
2752                 cgdl->ccb_h.status = CAM_REQ_CMP;
2753                 break;
2754         }
2755         case XPT_DEV_MATCH:
2756         {
2757                 dev_pos_type position_type;
2758                 struct ccb_dev_match *cdm;
2759
2760                 cdm = &start_ccb->cdm;
2761
2762                 /*
2763                  * There are two ways of getting at information in the EDT.
2764                  * The first way is via the primary EDT tree.  It starts
2765                  * with a list of busses, then a list of targets on a bus,
2766                  * then devices/luns on a target, and then peripherals on a
2767                  * device/lun.  The "other" way is by the peripheral driver
2768                  * lists.  The peripheral driver lists are organized by
2769                  * peripheral driver.  (obviously)  So it makes sense to
2770                  * use the peripheral driver list if the user is looking
2771                  * for something like "da1", or all "da" devices.  If the
2772                  * user is looking for something on a particular bus/target
2773                  * or lun, it's generally better to go through the EDT tree.
2774                  */
2775
2776                 if (cdm->pos.position_type != CAM_DEV_POS_NONE)
2777                         position_type = cdm->pos.position_type;
2778                 else {
2779                         u_int i;
2780
2781                         position_type = CAM_DEV_POS_NONE;
2782
2783                         for (i = 0; i < cdm->num_patterns; i++) {
2784                                 if ((cdm->patterns[i].type == DEV_MATCH_BUS)
2785                                  ||(cdm->patterns[i].type == DEV_MATCH_DEVICE)){
2786                                         position_type = CAM_DEV_POS_EDT;
2787                                         break;
2788                                 }
2789                         }
2790
2791                         if (cdm->num_patterns == 0)
2792                                 position_type = CAM_DEV_POS_EDT;
2793                         else if (position_type == CAM_DEV_POS_NONE)
2794                                 position_type = CAM_DEV_POS_PDRV;
2795                 }
2796
2797                 switch(position_type & CAM_DEV_POS_TYPEMASK) {
2798                 case CAM_DEV_POS_EDT:
2799                         xptedtmatch(cdm);
2800                         break;
2801                 case CAM_DEV_POS_PDRV:
2802                         xptperiphlistmatch(cdm);
2803                         break;
2804                 default:
2805                         cdm->status = CAM_DEV_MATCH_ERROR;
2806                         break;
2807                 }
2808
2809                 if (cdm->status == CAM_DEV_MATCH_ERROR)
2810                         start_ccb->ccb_h.status = CAM_REQ_CMP_ERR;
2811                 else
2812                         start_ccb->ccb_h.status = CAM_REQ_CMP;
2813
2814                 break;
2815         }
2816         case XPT_SASYNC_CB:
2817         {
2818                 struct ccb_setasync *csa;
2819                 struct async_node *cur_entry;
2820                 struct async_list *async_head;
2821                 u_int32_t added;
2822
2823                 csa = &start_ccb->csa;
2824                 added = csa->event_enable;
2825                 async_head = &path->device->asyncs;
2826
2827                 /*
2828                  * If there is already an entry for us, simply
2829                  * update it.
2830                  */
2831                 cur_entry = SLIST_FIRST(async_head);
2832                 while (cur_entry != NULL) {
2833                         if ((cur_entry->callback_arg == csa->callback_arg)
2834                          && (cur_entry->callback == csa->callback))
2835                                 break;
2836                         cur_entry = SLIST_NEXT(cur_entry, links);
2837                 }
2838
2839                 if (cur_entry != NULL) {
2840                         /*
2841                          * If the request has no flags set,
2842                          * remove the entry.
2843                          */
2844                         added &= ~cur_entry->event_enable;
2845                         if (csa->event_enable == 0) {
2846                                 SLIST_REMOVE(async_head, cur_entry,
2847                                              async_node, links);
2848                                 xpt_release_device(path->device);
2849                                 free(cur_entry, M_CAMXPT);
2850                         } else {
2851                                 cur_entry->event_enable = csa->event_enable;
2852                         }
2853                         csa->event_enable = added;
2854                 } else {
2855                         cur_entry = malloc(sizeof(*cur_entry), M_CAMXPT,
2856                                            M_NOWAIT);
2857                         if (cur_entry == NULL) {
2858                                 csa->ccb_h.status = CAM_RESRC_UNAVAIL;
2859                                 break;
2860                         }
2861                         cur_entry->event_enable = csa->event_enable;
2862                         cur_entry->event_lock =
2863                             mtx_owned(path->bus->sim->mtx) ? 1 : 0;
2864                         cur_entry->callback_arg = csa->callback_arg;
2865                         cur_entry->callback = csa->callback;
2866                         SLIST_INSERT_HEAD(async_head, cur_entry, links);
2867                         xpt_acquire_device(path->device);
2868                 }
2869                 start_ccb->ccb_h.status = CAM_REQ_CMP;
2870                 break;
2871         }
2872         case XPT_REL_SIMQ:
2873         {
2874                 struct ccb_relsim *crs;
2875                 struct cam_ed *dev;
2876
2877                 crs = &start_ccb->crs;
2878                 dev = path->device;
2879                 if (dev == NULL) {
2880
2881                         crs->ccb_h.status = CAM_DEV_NOT_THERE;
2882                         break;
2883                 }
2884
2885                 if ((crs->release_flags & RELSIM_ADJUST_OPENINGS) != 0) {
2886
2887                         /* Don't ever go below one opening */
2888                         if (crs->openings > 0) {
2889                                 xpt_dev_ccbq_resize(path, crs->openings);
2890                                 if (bootverbose) {
2891                                         xpt_print(path,
2892                                             "number of openings is now %d\n",
2893                                             crs->openings);
2894                                 }
2895                         }
2896                 }
2897
2898                 mtx_lock(&dev->sim->devq->send_mtx);
2899                 if ((crs->release_flags & RELSIM_RELEASE_AFTER_TIMEOUT) != 0) {
2900
2901                         if ((dev->flags & CAM_DEV_REL_TIMEOUT_PENDING) != 0) {
2902
2903                                 /*
2904                                  * Just extend the old timeout and decrement
2905                                  * the freeze count so that a single timeout
2906                                  * is sufficient for releasing the queue.
2907                                  */
2908                                 start_ccb->ccb_h.flags &= ~CAM_DEV_QFREEZE;
2909                                 callout_stop(&dev->callout);
2910                         } else {
2911
2912                                 start_ccb->ccb_h.flags |= CAM_DEV_QFREEZE;
2913                         }
2914
2915                         callout_reset_sbt(&dev->callout,
2916                             SBT_1MS * crs->release_timeout, 0,
2917                             xpt_release_devq_timeout, dev, 0);
2918
2919                         dev->flags |= CAM_DEV_REL_TIMEOUT_PENDING;
2920
2921                 }
2922
2923                 if ((crs->release_flags & RELSIM_RELEASE_AFTER_CMDCMPLT) != 0) {
2924
2925                         if ((dev->flags & CAM_DEV_REL_ON_COMPLETE) != 0) {
2926                                 /*
2927                                  * Decrement the freeze count so that a single
2928                                  * completion is still sufficient to unfreeze
2929                                  * the queue.
2930                                  */
2931                                 start_ccb->ccb_h.flags &= ~CAM_DEV_QFREEZE;
2932                         } else {
2933
2934                                 dev->flags |= CAM_DEV_REL_ON_COMPLETE;
2935                                 start_ccb->ccb_h.flags |= CAM_DEV_QFREEZE;
2936                         }
2937                 }
2938
2939                 if ((crs->release_flags & RELSIM_RELEASE_AFTER_QEMPTY) != 0) {
2940
2941                         if ((dev->flags & CAM_DEV_REL_ON_QUEUE_EMPTY) != 0
2942                          || (dev->ccbq.dev_active == 0)) {
2943
2944                                 start_ccb->ccb_h.flags &= ~CAM_DEV_QFREEZE;
2945                         } else {
2946
2947                                 dev->flags |= CAM_DEV_REL_ON_QUEUE_EMPTY;
2948                                 start_ccb->ccb_h.flags |= CAM_DEV_QFREEZE;
2949                         }
2950                 }
2951                 mtx_unlock(&dev->sim->devq->send_mtx);
2952
2953                 if ((start_ccb->ccb_h.flags & CAM_DEV_QFREEZE) == 0)
2954                         xpt_release_devq(path, /*count*/1, /*run_queue*/TRUE);
2955                 start_ccb->crs.qfrozen_cnt = dev->ccbq.queue.qfrozen_cnt;
2956                 start_ccb->ccb_h.status = CAM_REQ_CMP;
2957                 break;
2958         }
2959         case XPT_DEBUG: {
2960                 struct cam_path *oldpath;
2961
2962                 /* Check that all request bits are supported. */
2963                 if (start_ccb->cdbg.flags & ~(CAM_DEBUG_COMPILE)) {
2964                         start_ccb->ccb_h.status = CAM_FUNC_NOTAVAIL;
2965                         break;
2966                 }
2967
2968                 cam_dflags = CAM_DEBUG_NONE;
2969                 if (cam_dpath != NULL) {
2970                         oldpath = cam_dpath;
2971                         cam_dpath = NULL;
2972                         xpt_free_path(oldpath);
2973                 }
2974                 if (start_ccb->cdbg.flags != CAM_DEBUG_NONE) {
2975                         if (xpt_create_path(&cam_dpath, NULL,
2976                                             start_ccb->ccb_h.path_id,
2977                                             start_ccb->ccb_h.target_id,
2978                                             start_ccb->ccb_h.target_lun) !=
2979                                             CAM_REQ_CMP) {
2980                                 start_ccb->ccb_h.status = CAM_RESRC_UNAVAIL;
2981                         } else {
2982                                 cam_dflags = start_ccb->cdbg.flags;
2983                                 start_ccb->ccb_h.status = CAM_REQ_CMP;
2984                                 xpt_print(cam_dpath, "debugging flags now %x\n",
2985                                     cam_dflags);
2986                         }
2987                 } else
2988                         start_ccb->ccb_h.status = CAM_REQ_CMP;
2989                 break;
2990         }
2991         case XPT_NOOP:
2992                 if ((start_ccb->ccb_h.flags & CAM_DEV_QFREEZE) != 0)
2993                         xpt_freeze_devq(path, 1);
2994                 start_ccb->ccb_h.status = CAM_REQ_CMP;
2995                 break;
2996         default:
2997         case XPT_SDEV_TYPE:
2998         case XPT_TERM_IO:
2999         case XPT_ENG_INQ:
3000                 /* XXX Implement */
3001                 printf("%s: CCB type %#x not supported\n", __func__,
3002                        start_ccb->ccb_h.func_code);
3003                 start_ccb->ccb_h.status = CAM_PROVIDE_FAIL;
3004                 if (start_ccb->ccb_h.func_code & XPT_FC_DEV_QUEUED) {
3005                         xpt_done(start_ccb);
3006                 }
3007                 break;
3008         }
3009 }
3010
3011 void
3012 xpt_polled_action(union ccb *start_ccb)
3013 {
3014         u_int32_t timeout;
3015         struct    cam_sim *sim;
3016         struct    cam_devq *devq;
3017         struct    cam_ed *dev;
3018
3019         timeout = start_ccb->ccb_h.timeout * 10;
3020         sim = start_ccb->ccb_h.path->bus->sim;
3021         devq = sim->devq;
3022         dev = start_ccb->ccb_h.path->device;
3023
3024         mtx_unlock(&dev->device_mtx);
3025
3026         /*
3027          * Steal an opening so that no other queued requests
3028          * can get it before us while we simulate interrupts.
3029          */
3030         mtx_lock(&devq->send_mtx);
3031         dev->ccbq.dev_openings--;
3032         while((devq->send_openings <= 0 || dev->ccbq.dev_openings < 0) &&
3033             (--timeout > 0)) {
3034                 mtx_unlock(&devq->send_mtx);
3035                 DELAY(100);
3036                 CAM_SIM_LOCK(sim);
3037                 (*(sim->sim_poll))(sim);
3038                 CAM_SIM_UNLOCK(sim);
3039                 camisr_runqueue();
3040                 mtx_lock(&devq->send_mtx);
3041         }
3042         dev->ccbq.dev_openings++;
3043         mtx_unlock(&devq->send_mtx);
3044
3045         if (timeout != 0) {
3046                 xpt_action(start_ccb);
3047                 while(--timeout > 0) {
3048                         CAM_SIM_LOCK(sim);
3049                         (*(sim->sim_poll))(sim);
3050                         CAM_SIM_UNLOCK(sim);
3051                         camisr_runqueue();
3052                         if ((start_ccb->ccb_h.status  & CAM_STATUS_MASK)
3053                             != CAM_REQ_INPROG)
3054                                 break;
3055                         DELAY(100);
3056                 }
3057                 if (timeout == 0) {
3058                         /*
3059                          * XXX Is it worth adding a sim_timeout entry
3060                          * point so we can attempt recovery?  If
3061                          * this is only used for dumps, I don't think
3062                          * it is.
3063                          */
3064                         start_ccb->ccb_h.status = CAM_CMD_TIMEOUT;
3065                 }
3066         } else {
3067                 start_ccb->ccb_h.status = CAM_RESRC_UNAVAIL;
3068         }
3069
3070         mtx_lock(&dev->device_mtx);
3071 }
3072
3073 /*
3074  * Schedule a peripheral driver to receive a ccb when its
3075  * target device has space for more transactions.
3076  */
3077 void
3078 xpt_schedule(struct cam_periph *periph, u_int32_t new_priority)
3079 {
3080
3081         CAM_DEBUG(periph->path, CAM_DEBUG_TRACE, ("xpt_schedule\n"));
3082         cam_periph_assert(periph, MA_OWNED);
3083         if (new_priority < periph->scheduled_priority) {
3084                 periph->scheduled_priority = new_priority;
3085                 xpt_run_allocq(periph, 0);
3086         }
3087 }
3088
3089
3090 /*
3091  * Schedule a device to run on a given queue.
3092  * If the device was inserted as a new entry on the queue,
3093  * return 1 meaning the device queue should be run. If we
3094  * were already queued, implying someone else has already
3095  * started the queue, return 0 so the caller doesn't attempt
3096  * to run the queue.
3097  */
3098 static int
3099 xpt_schedule_dev(struct camq *queue, cam_pinfo *pinfo,
3100                  u_int32_t new_priority)
3101 {
3102         int retval;
3103         u_int32_t old_priority;
3104
3105         CAM_DEBUG_PRINT(CAM_DEBUG_XPT, ("xpt_schedule_dev\n"));
3106
3107         old_priority = pinfo->priority;
3108
3109         /*
3110          * Are we already queued?
3111          */
3112         if (pinfo->index != CAM_UNQUEUED_INDEX) {
3113                 /* Simply reorder based on new priority */
3114                 if (new_priority < old_priority) {
3115                         camq_change_priority(queue, pinfo->index,
3116                                              new_priority);
3117                         CAM_DEBUG_PRINT(CAM_DEBUG_XPT,
3118                                         ("changed priority to %d\n",
3119                                          new_priority));
3120                         retval = 1;
3121                 } else
3122                         retval = 0;
3123         } else {
3124                 /* New entry on the queue */
3125                 if (new_priority < old_priority)
3126                         pinfo->priority = new_priority;
3127
3128                 CAM_DEBUG_PRINT(CAM_DEBUG_XPT,
3129                                 ("Inserting onto queue\n"));
3130                 pinfo->generation = ++queue->generation;
3131                 camq_insert(queue, pinfo);
3132                 retval = 1;
3133         }
3134         return (retval);
3135 }
3136
3137 static void
3138 xpt_run_allocq_task(void *context, int pending)
3139 {
3140         struct cam_periph *periph = context;
3141
3142         cam_periph_lock(periph);
3143         periph->flags &= ~CAM_PERIPH_RUN_TASK;
3144         xpt_run_allocq(periph, 1);
3145         cam_periph_unlock(periph);
3146         cam_periph_release(periph);
3147 }
3148
3149 static void
3150 xpt_run_allocq(struct cam_periph *periph, int sleep)
3151 {
3152         struct cam_ed   *device;
3153         union ccb       *ccb;
3154         uint32_t         prio;
3155
3156         cam_periph_assert(periph, MA_OWNED);
3157         if (periph->periph_allocating)
3158                 return;
3159         periph->periph_allocating = 1;
3160         CAM_DEBUG_PRINT(CAM_DEBUG_XPT, ("xpt_run_allocq(%p)\n", periph));
3161         device = periph->path->device;
3162         ccb = NULL;
3163 restart:
3164         while ((prio = min(periph->scheduled_priority,
3165             periph->immediate_priority)) != CAM_PRIORITY_NONE &&
3166             (periph->periph_allocated - (ccb != NULL ? 1 : 0) <
3167              device->ccbq.total_openings || prio <= CAM_PRIORITY_OOB)) {
3168
3169                 if (ccb == NULL &&
3170                     (ccb = xpt_get_ccb_nowait(periph)) == NULL) {
3171                         if (sleep) {
3172                                 ccb = xpt_get_ccb(periph);
3173                                 goto restart;
3174                         }
3175                         if (periph->flags & CAM_PERIPH_RUN_TASK)
3176                                 break;
3177                         cam_periph_doacquire(periph);
3178                         periph->flags |= CAM_PERIPH_RUN_TASK;
3179                         taskqueue_enqueue(xsoftc.xpt_taskq,
3180                             &periph->periph_run_task);
3181                         break;
3182                 }
3183                 xpt_setup_ccb(&ccb->ccb_h, periph->path, prio);
3184                 if (prio == periph->immediate_priority) {
3185                         periph->immediate_priority = CAM_PRIORITY_NONE;
3186                         CAM_DEBUG_PRINT(CAM_DEBUG_XPT,
3187                                         ("waking cam_periph_getccb()\n"));
3188                         SLIST_INSERT_HEAD(&periph->ccb_list, &ccb->ccb_h,
3189                                           periph_links.sle);
3190                         wakeup(&periph->ccb_list);
3191                 } else {
3192                         periph->scheduled_priority = CAM_PRIORITY_NONE;
3193                         CAM_DEBUG_PRINT(CAM_DEBUG_XPT,
3194                                         ("calling periph_start()\n"));
3195                         periph->periph_start(periph, ccb);
3196                 }
3197                 ccb = NULL;
3198         }
3199         if (ccb != NULL)
3200                 xpt_release_ccb(ccb);
3201         periph->periph_allocating = 0;
3202 }
3203
3204 static void
3205 xpt_run_devq(struct cam_devq *devq)
3206 {
3207         char cdb_str[(SCSI_MAX_CDBLEN * 3) + 1];
3208         int lock;
3209
3210         CAM_DEBUG_PRINT(CAM_DEBUG_XPT, ("xpt_run_devq\n"));
3211
3212         devq->send_queue.qfrozen_cnt++;
3213         while ((devq->send_queue.entries > 0)
3214             && (devq->send_openings > 0)
3215             && (devq->send_queue.qfrozen_cnt <= 1)) {
3216                 struct  cam_ed *device;
3217                 union ccb *work_ccb;
3218                 struct  cam_sim *sim;
3219
3220                 device = (struct cam_ed *)camq_remove(&devq->send_queue,
3221                                                            CAMQ_HEAD);
3222                 CAM_DEBUG_PRINT(CAM_DEBUG_XPT,
3223                                 ("running device %p\n", device));
3224
3225                 work_ccb = cam_ccbq_peek_ccb(&device->ccbq, CAMQ_HEAD);
3226                 if (work_ccb == NULL) {
3227                         printf("device on run queue with no ccbs???\n");
3228                         continue;
3229                 }
3230
3231                 if ((work_ccb->ccb_h.flags & CAM_HIGH_POWER) != 0) {
3232
3233                         mtx_lock(&xsoftc.xpt_highpower_lock);
3234                         if (xsoftc.num_highpower <= 0) {
3235                                 /*
3236                                  * We got a high power command, but we
3237                                  * don't have any available slots.  Freeze
3238                                  * the device queue until we have a slot
3239                                  * available.
3240                                  */
3241                                 xpt_freeze_devq_device(device, 1);
3242                                 STAILQ_INSERT_TAIL(&xsoftc.highpowerq, device,
3243                                                    highpowerq_entry);
3244
3245                                 mtx_unlock(&xsoftc.xpt_highpower_lock);
3246                                 continue;
3247                         } else {
3248                                 /*
3249                                  * Consume a high power slot while
3250                                  * this ccb runs.
3251                                  */
3252                                 xsoftc.num_highpower--;
3253                         }
3254                         mtx_unlock(&xsoftc.xpt_highpower_lock);
3255                 }
3256                 cam_ccbq_remove_ccb(&device->ccbq, work_ccb);
3257                 cam_ccbq_send_ccb(&device->ccbq, work_ccb);
3258                 devq->send_openings--;
3259                 devq->send_active++;
3260                 xpt_schedule_devq(devq, device);
3261                 mtx_unlock(&devq->send_mtx);
3262
3263                 if ((work_ccb->ccb_h.flags & CAM_DEV_QFREEZE) != 0) {
3264                         /*
3265                          * The client wants to freeze the queue
3266                          * after this CCB is sent.
3267                          */
3268                         xpt_freeze_devq(work_ccb->ccb_h.path, 1);
3269                 }
3270
3271                 /* In Target mode, the peripheral driver knows best... */
3272                 if (work_ccb->ccb_h.func_code == XPT_SCSI_IO) {
3273                         if ((device->inq_flags & SID_CmdQue) != 0
3274                          && work_ccb->csio.tag_action != CAM_TAG_ACTION_NONE)
3275                                 work_ccb->ccb_h.flags |= CAM_TAG_ACTION_VALID;
3276                         else
3277                                 /*
3278                                  * Clear this in case of a retried CCB that
3279                                  * failed due to a rejected tag.
3280                                  */
3281                                 work_ccb->ccb_h.flags &= ~CAM_TAG_ACTION_VALID;
3282                 }
3283
3284                 switch (work_ccb->ccb_h.func_code) {
3285                 case XPT_SCSI_IO:
3286                         CAM_DEBUG(work_ccb->ccb_h.path,
3287                             CAM_DEBUG_CDB,("%s. CDB: %s\n",
3288                              scsi_op_desc(work_ccb->csio.cdb_io.cdb_bytes[0],
3289                                           &device->inq_data),
3290                              scsi_cdb_string(work_ccb->csio.cdb_io.cdb_bytes,
3291                                              cdb_str, sizeof(cdb_str))));
3292                         break;
3293                 case XPT_ATA_IO:
3294                         CAM_DEBUG(work_ccb->ccb_h.path,
3295                             CAM_DEBUG_CDB,("%s. ACB: %s\n",
3296                              ata_op_string(&work_ccb->ataio.cmd),
3297                              ata_cmd_string(&work_ccb->ataio.cmd,
3298                                             cdb_str, sizeof(cdb_str))));
3299                         break;
3300                 default:
3301                         break;
3302                 }
3303
3304                 /*
3305                  * Device queues can be shared among multiple SIM instances
3306                  * that reside on different busses.  Use the SIM from the
3307                  * queued device, rather than the one from the calling bus.
3308                  */
3309                 sim = device->sim;
3310                 lock = (mtx_owned(sim->mtx) == 0);
3311                 if (lock)
3312                         CAM_SIM_LOCK(sim);
3313                 (*(sim->sim_action))(sim, work_ccb);
3314                 if (lock)
3315                         CAM_SIM_UNLOCK(sim);
3316                 mtx_lock(&devq->send_mtx);
3317         }
3318         devq->send_queue.qfrozen_cnt--;
3319 }
3320
3321 /*
3322  * This function merges stuff from the slave ccb into the master ccb, while
3323  * keeping important fields in the master ccb constant.
3324  */
3325 void
3326 xpt_merge_ccb(union ccb *master_ccb, union ccb *slave_ccb)
3327 {
3328
3329         /*
3330          * Pull fields that are valid for peripheral drivers to set
3331          * into the master CCB along with the CCB "payload".
3332          */
3333         master_ccb->ccb_h.retry_count = slave_ccb->ccb_h.retry_count;
3334         master_ccb->ccb_h.func_code = slave_ccb->ccb_h.func_code;
3335         master_ccb->ccb_h.timeout = slave_ccb->ccb_h.timeout;
3336         master_ccb->ccb_h.flags = slave_ccb->ccb_h.flags;
3337         bcopy(&(&slave_ccb->ccb_h)[1], &(&master_ccb->ccb_h)[1],
3338               sizeof(union ccb) - sizeof(struct ccb_hdr));
3339 }
3340
3341 void
3342 xpt_setup_ccb_flags(struct ccb_hdr *ccb_h, struct cam_path *path,
3343                     u_int32_t priority, u_int32_t flags)
3344 {
3345
3346         CAM_DEBUG(path, CAM_DEBUG_TRACE, ("xpt_setup_ccb\n"));
3347         ccb_h->pinfo.priority = priority;
3348         ccb_h->path = path;
3349         ccb_h->path_id = path->bus->path_id;
3350         if (path->target)
3351                 ccb_h->target_id = path->target->target_id;
3352         else
3353                 ccb_h->target_id = CAM_TARGET_WILDCARD;
3354         if (path->device) {
3355                 ccb_h->target_lun = path->device->lun_id;
3356                 ccb_h->pinfo.generation = ++path->device->ccbq.queue.generation;
3357         } else {
3358                 ccb_h->target_lun = CAM_TARGET_WILDCARD;
3359         }
3360         ccb_h->pinfo.index = CAM_UNQUEUED_INDEX;
3361         ccb_h->flags = flags;
3362         ccb_h->xflags = 0;
3363 }
3364
3365 void
3366 xpt_setup_ccb(struct ccb_hdr *ccb_h, struct cam_path *path, u_int32_t priority)
3367 {
3368         xpt_setup_ccb_flags(ccb_h, path, priority, /*flags*/ 0);
3369 }
3370
3371 /* Path manipulation functions */
3372 cam_status
3373 xpt_create_path(struct cam_path **new_path_ptr, struct cam_periph *perph,
3374                 path_id_t path_id, target_id_t target_id, lun_id_t lun_id)
3375 {
3376         struct     cam_path *path;
3377         cam_status status;
3378
3379         path = (struct cam_path *)malloc(sizeof(*path), M_CAMPATH, M_NOWAIT);
3380
3381         if (path == NULL) {
3382                 status = CAM_RESRC_UNAVAIL;
3383                 return(status);
3384         }
3385         status = xpt_compile_path(path, perph, path_id, target_id, lun_id);
3386         if (status != CAM_REQ_CMP) {
3387                 free(path, M_CAMPATH);
3388                 path = NULL;
3389         }
3390         *new_path_ptr = path;
3391         return (status);
3392 }
3393
3394 cam_status
3395 xpt_create_path_unlocked(struct cam_path **new_path_ptr,
3396                          struct cam_periph *periph, path_id_t path_id,
3397                          target_id_t target_id, lun_id_t lun_id)
3398 {
3399
3400         return (xpt_create_path(new_path_ptr, periph, path_id, target_id,
3401             lun_id));
3402 }
3403
3404 cam_status
3405 xpt_compile_path(struct cam_path *new_path, struct cam_periph *perph,
3406                  path_id_t path_id, target_id_t target_id, lun_id_t lun_id)
3407 {
3408         struct       cam_eb *bus;
3409         struct       cam_et *target;
3410         struct       cam_ed *device;
3411         cam_status   status;
3412
3413         status = CAM_REQ_CMP;   /* Completed without error */
3414         target = NULL;          /* Wildcarded */
3415         device = NULL;          /* Wildcarded */
3416
3417         /*
3418          * We will potentially modify the EDT, so block interrupts
3419          * that may attempt to create cam paths.
3420          */
3421         bus = xpt_find_bus(path_id);
3422         if (bus == NULL) {
3423                 status = CAM_PATH_INVALID;
3424         } else {
3425                 xpt_lock_buses();
3426                 mtx_lock(&bus->eb_mtx);
3427                 target = xpt_find_target(bus, target_id);
3428                 if (target == NULL) {
3429                         /* Create one */
3430                         struct cam_et *new_target;
3431
3432                         new_target = xpt_alloc_target(bus, target_id);
3433                         if (new_target == NULL) {
3434                                 status = CAM_RESRC_UNAVAIL;
3435                         } else {
3436                                 target = new_target;
3437                         }
3438                 }
3439                 xpt_unlock_buses();
3440                 if (target != NULL) {
3441                         device = xpt_find_device(target, lun_id);
3442                         if (device == NULL) {
3443                                 /* Create one */
3444                                 struct cam_ed *new_device;
3445
3446                                 new_device =
3447                                     (*(bus->xport->alloc_device))(bus,
3448                                                                       target,
3449                                                                       lun_id);
3450                                 if (new_device == NULL) {
3451                                         status = CAM_RESRC_UNAVAIL;
3452                                 } else {
3453                                         device = new_device;
3454                                 }
3455                         }
3456                 }
3457                 mtx_unlock(&bus->eb_mtx);
3458         }
3459
3460         /*
3461          * Only touch the user's data if we are successful.
3462          */
3463         if (status == CAM_REQ_CMP) {
3464                 new_path->periph = perph;
3465                 new_path->bus = bus;
3466                 new_path->target = target;
3467                 new_path->device = device;
3468                 CAM_DEBUG(new_path, CAM_DEBUG_TRACE, ("xpt_compile_path\n"));
3469         } else {
3470                 if (device != NULL)
3471                         xpt_release_device(device);
3472                 if (target != NULL)
3473                         xpt_release_target(target);
3474                 if (bus != NULL)
3475                         xpt_release_bus(bus);
3476         }
3477         return (status);
3478 }
3479
3480 cam_status
3481 xpt_clone_path(struct cam_path **new_path_ptr, struct cam_path *path)
3482 {
3483         struct     cam_path *new_path;
3484
3485         new_path = (struct cam_path *)malloc(sizeof(*path), M_CAMPATH, M_NOWAIT);
3486         if (new_path == NULL)
3487                 return(CAM_RESRC_UNAVAIL);
3488         xpt_copy_path(new_path, path);
3489         *new_path_ptr = new_path;
3490         return (CAM_REQ_CMP);
3491 }
3492
3493 void
3494 xpt_copy_path(struct cam_path *new_path, struct cam_path *path)
3495 {
3496
3497         *new_path = *path;
3498         if (path->bus != NULL)
3499                 xpt_acquire_bus(path->bus);
3500         if (path->target != NULL)
3501                 xpt_acquire_target(path->target);
3502         if (path->device != NULL)
3503                 xpt_acquire_device(path->device);
3504 }
3505
3506 void
3507 xpt_release_path(struct cam_path *path)
3508 {
3509         CAM_DEBUG(path, CAM_DEBUG_TRACE, ("xpt_release_path\n"));
3510         if (path->device != NULL) {
3511                 xpt_release_device(path->device);
3512                 path->device = NULL;
3513         }
3514         if (path->target != NULL) {
3515                 xpt_release_target(path->target);
3516                 path->target = NULL;
3517         }
3518         if (path->bus != NULL) {
3519                 xpt_release_bus(path->bus);
3520                 path->bus = NULL;
3521         }
3522 }
3523
3524 void
3525 xpt_free_path(struct cam_path *path)
3526 {
3527
3528         CAM_DEBUG(path, CAM_DEBUG_TRACE, ("xpt_free_path\n"));
3529         xpt_release_path(path);
3530         free(path, M_CAMPATH);
3531 }
3532
3533 void
3534 xpt_path_counts(struct cam_path *path, uint32_t *bus_ref,
3535     uint32_t *periph_ref, uint32_t *target_ref, uint32_t *device_ref)
3536 {
3537
3538         xpt_lock_buses();
3539         if (bus_ref) {
3540                 if (path->bus)
3541                         *bus_ref = path->bus->refcount;
3542                 else
3543                         *bus_ref = 0;
3544         }
3545         if (periph_ref) {
3546                 if (path->periph)
3547                         *periph_ref = path->periph->refcount;
3548                 else
3549                         *periph_ref = 0;
3550         }
3551         xpt_unlock_buses();
3552         if (target_ref) {
3553                 if (path->target)
3554                         *target_ref = path->target->refcount;
3555                 else
3556                         *target_ref = 0;
3557         }
3558         if (device_ref) {
3559                 if (path->device)
3560                         *device_ref = path->device->refcount;
3561                 else
3562                         *device_ref = 0;
3563         }
3564 }
3565
3566 /*
3567  * Return -1 for failure, 0 for exact match, 1 for match with wildcards
3568  * in path1, 2 for match with wildcards in path2.
3569  */
3570 int
3571 xpt_path_comp(struct cam_path *path1, struct cam_path *path2)
3572 {
3573         int retval = 0;
3574
3575         if (path1->bus != path2->bus) {
3576                 if (path1->bus->path_id == CAM_BUS_WILDCARD)
3577                         retval = 1;
3578                 else if (path2->bus->path_id == CAM_BUS_WILDCARD)
3579                         retval = 2;
3580                 else
3581                         return (-1);
3582         }
3583         if (path1->target != path2->target) {
3584                 if (path1->target->target_id == CAM_TARGET_WILDCARD) {
3585                         if (retval == 0)
3586                                 retval = 1;
3587                 } else if (path2->target->target_id == CAM_TARGET_WILDCARD)
3588                         retval = 2;
3589                 else
3590                         return (-1);
3591         }
3592         if (path1->device != path2->device) {
3593                 if (path1->device->lun_id == CAM_LUN_WILDCARD) {
3594                         if (retval == 0)
3595                                 retval = 1;
3596                 } else if (path2->device->lun_id == CAM_LUN_WILDCARD)
3597                         retval = 2;
3598                 else
3599                         return (-1);
3600         }
3601         return (retval);
3602 }
3603
3604 int
3605 xpt_path_comp_dev(struct cam_path *path, struct cam_ed *dev)
3606 {
3607         int retval = 0;
3608
3609         if (path->bus != dev->target->bus) {
3610                 if (path->bus->path_id == CAM_BUS_WILDCARD)
3611                         retval = 1;
3612                 else if (dev->target->bus->path_id == CAM_BUS_WILDCARD)
3613                         retval = 2;
3614                 else
3615                         return (-1);
3616         }
3617         if (path->target != dev->target) {
3618                 if (path->target->target_id == CAM_TARGET_WILDCARD) {
3619                         if (retval == 0)
3620                                 retval = 1;
3621                 } else if (dev->target->target_id == CAM_TARGET_WILDCARD)
3622                         retval = 2;
3623                 else
3624                         return (-1);
3625         }
3626         if (path->device != dev) {
3627                 if (path->device->lun_id == CAM_LUN_WILDCARD) {
3628                         if (retval == 0)
3629                                 retval = 1;
3630                 } else if (dev->lun_id == CAM_LUN_WILDCARD)
3631                         retval = 2;
3632                 else
3633                         return (-1);
3634         }
3635         return (retval);
3636 }
3637
3638 void
3639 xpt_print_path(struct cam_path *path)
3640 {
3641
3642         if (path == NULL)
3643                 printf("(nopath): ");
3644         else {
3645                 if (path->periph != NULL)
3646                         printf("(%s%d:", path->periph->periph_name,
3647                                path->periph->unit_number);
3648                 else
3649                         printf("(noperiph:");
3650
3651                 if (path->bus != NULL)
3652                         printf("%s%d:%d:", path->bus->sim->sim_name,
3653                                path->bus->sim->unit_number,
3654                                path->bus->sim->bus_id);
3655                 else
3656                         printf("nobus:");
3657
3658                 if (path->target != NULL)
3659                         printf("%d:", path->target->target_id);
3660                 else
3661                         printf("X:");
3662
3663                 if (path->device != NULL)
3664                         printf("%jx): ", (uintmax_t)path->device->lun_id);
3665                 else
3666                         printf("X): ");
3667         }
3668 }
3669
3670 void
3671 xpt_print_device(struct cam_ed *device)
3672 {
3673
3674         if (device == NULL)
3675                 printf("(nopath): ");
3676         else {
3677                 printf("(noperiph:%s%d:%d:%d:%jx): ", device->sim->sim_name,
3678                        device->sim->unit_number,
3679                        device->sim->bus_id,
3680                        device->target->target_id,
3681                        (uintmax_t)device->lun_id);
3682         }
3683 }
3684
3685 void
3686 xpt_print(struct cam_path *path, const char *fmt, ...)
3687 {
3688         va_list ap;
3689         xpt_print_path(path);
3690         va_start(ap, fmt);
3691         vprintf(fmt, ap);
3692         va_end(ap);
3693 }
3694
3695 int
3696 xpt_path_string(struct cam_path *path, char *str, size_t str_len)
3697 {
3698         struct sbuf sb;
3699
3700         sbuf_new(&sb, str, str_len, 0);
3701
3702         if (path == NULL)
3703                 sbuf_printf(&sb, "(nopath): ");
3704         else {
3705                 if (path->periph != NULL)
3706                         sbuf_printf(&sb, "(%s%d:", path->periph->periph_name,
3707                                     path->periph->unit_number);
3708                 else
3709                         sbuf_printf(&sb, "(noperiph:");
3710
3711                 if (path->bus != NULL)
3712                         sbuf_printf(&sb, "%s%d:%d:", path->bus->sim->sim_name,
3713                                     path->bus->sim->unit_number,
3714                                     path->bus->sim->bus_id);
3715                 else
3716                         sbuf_printf(&sb, "nobus:");
3717
3718                 if (path->target != NULL)
3719                         sbuf_printf(&sb, "%d:", path->target->target_id);
3720                 else
3721                         sbuf_printf(&sb, "X:");
3722
3723                 if (path->device != NULL)
3724                         sbuf_printf(&sb, "%jx): ",
3725                             (uintmax_t)path->device->lun_id);
3726                 else
3727                         sbuf_printf(&sb, "X): ");
3728         }
3729         sbuf_finish(&sb);
3730
3731         return(sbuf_len(&sb));
3732 }
3733
3734 path_id_t
3735 xpt_path_path_id(struct cam_path *path)
3736 {
3737         return(path->bus->path_id);
3738 }
3739
3740 target_id_t
3741 xpt_path_target_id(struct cam_path *path)
3742 {
3743         if (path->target != NULL)
3744                 return (path->target->target_id);
3745         else
3746                 return (CAM_TARGET_WILDCARD);
3747 }
3748
3749 lun_id_t
3750 xpt_path_lun_id(struct cam_path *path)
3751 {
3752         if (path->device != NULL)
3753                 return (path->device->lun_id);
3754         else
3755                 return (CAM_LUN_WILDCARD);
3756 }
3757
3758 struct cam_sim *
3759 xpt_path_sim(struct cam_path *path)
3760 {
3761
3762         return (path->bus->sim);
3763 }
3764
3765 struct cam_periph*
3766 xpt_path_periph(struct cam_path *path)
3767 {
3768
3769         return (path->periph);
3770 }
3771
3772 /*
3773  * Release a CAM control block for the caller.  Remit the cost of the structure
3774  * to the device referenced by the path.  If the this device had no 'credits'
3775  * and peripheral drivers have registered async callbacks for this notification
3776  * call them now.
3777  */
3778 void
3779 xpt_release_ccb(union ccb *free_ccb)
3780 {
3781         struct   cam_ed *device;
3782         struct   cam_periph *periph;
3783
3784         CAM_DEBUG_PRINT(CAM_DEBUG_XPT, ("xpt_release_ccb\n"));
3785         xpt_path_assert(free_ccb->ccb_h.path, MA_OWNED);
3786         device = free_ccb->ccb_h.path->device;
3787         periph = free_ccb->ccb_h.path->periph;
3788
3789         xpt_free_ccb(free_ccb);
3790         periph->periph_allocated--;
3791         cam_ccbq_release_opening(&device->ccbq);
3792         xpt_run_allocq(periph, 0);
3793 }
3794
3795 /* Functions accessed by SIM drivers */
3796
3797 static struct xpt_xport xport_default = {
3798         .alloc_device = xpt_alloc_device_default,
3799         .action = xpt_action_default,
3800         .async = xpt_dev_async_default,
3801 };
3802
3803 /*
3804  * A sim structure, listing the SIM entry points and instance
3805  * identification info is passed to xpt_bus_register to hook the SIM
3806  * into the CAM framework.  xpt_bus_register creates a cam_eb entry
3807  * for this new bus and places it in the array of busses and assigns
3808  * it a path_id.  The path_id may be influenced by "hard wiring"
3809  * information specified by the user.  Once interrupt services are
3810  * available, the bus will be probed.
3811  */
3812 int32_t
3813 xpt_bus_register(struct cam_sim *sim, device_t parent, u_int32_t bus)
3814 {
3815         struct cam_eb *new_bus;
3816         struct cam_eb *old_bus;
3817         struct ccb_pathinq cpi;
3818         struct cam_path *path;
3819         cam_status status;
3820
3821         mtx_assert(sim->mtx, MA_OWNED);
3822
3823         sim->bus_id = bus;
3824         new_bus = (struct cam_eb *)malloc(sizeof(*new_bus),
3825                                           M_CAMXPT, M_NOWAIT|M_ZERO);
3826         if (new_bus == NULL) {
3827                 /* Couldn't satisfy request */
3828                 return (CAM_RESRC_UNAVAIL);
3829         }
3830
3831         mtx_init(&new_bus->eb_mtx, "CAM bus lock", NULL, MTX_DEF);
3832         TAILQ_INIT(&new_bus->et_entries);
3833         cam_sim_hold(sim);
3834         new_bus->sim = sim;
3835         timevalclear(&new_bus->last_reset);
3836         new_bus->flags = 0;
3837         new_bus->refcount = 1;  /* Held until a bus_deregister event */
3838         new_bus->generation = 0;
3839
3840         xpt_lock_buses();
3841         sim->path_id = new_bus->path_id =
3842             xptpathid(sim->sim_name, sim->unit_number, sim->bus_id);
3843         old_bus = TAILQ_FIRST(&xsoftc.xpt_busses);
3844         while (old_bus != NULL
3845             && old_bus->path_id < new_bus->path_id)
3846                 old_bus = TAILQ_NEXT(old_bus, links);
3847         if (old_bus != NULL)
3848                 TAILQ_INSERT_BEFORE(old_bus, new_bus, links);
3849         else
3850                 TAILQ_INSERT_TAIL(&xsoftc.xpt_busses, new_bus, links);
3851         xsoftc.bus_generation++;
3852         xpt_unlock_buses();
3853
3854         /*
3855          * Set a default transport so that a PATH_INQ can be issued to
3856          * the SIM.  This will then allow for probing and attaching of
3857          * a more appropriate transport.
3858          */
3859         new_bus->xport = &xport_default;
3860
3861         status = xpt_create_path(&path, /*periph*/NULL, sim->path_id,
3862                                   CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD);
3863         if (status != CAM_REQ_CMP) {
3864                 xpt_release_bus(new_bus);
3865                 free(path, M_CAMXPT);
3866                 return (CAM_RESRC_UNAVAIL);
3867         }
3868
3869         xpt_setup_ccb(&cpi.ccb_h, path, CAM_PRIORITY_NORMAL);
3870         cpi.ccb_h.func_code = XPT_PATH_INQ;
3871         xpt_action((union ccb *)&cpi);
3872
3873         if (cpi.ccb_h.status == CAM_REQ_CMP) {
3874                 switch (cpi.transport) {
3875                 case XPORT_SPI:
3876                 case XPORT_SAS:
3877                 case XPORT_FC:
3878                 case XPORT_USB:
3879                 case XPORT_ISCSI:
3880                 case XPORT_SRP:
3881                 case XPORT_PPB:
3882                         new_bus->xport = scsi_get_xport();
3883                         break;
3884                 case XPORT_ATA:
3885                 case XPORT_SATA:
3886                         new_bus->xport = ata_get_xport();
3887                         break;
3888                 default:
3889                         new_bus->xport = &xport_default;
3890                         break;
3891                 }
3892         }
3893
3894         /* Notify interested parties */
3895         if (sim->path_id != CAM_XPT_PATH_ID) {
3896
3897                 xpt_async(AC_PATH_REGISTERED, path, &cpi);
3898                 if ((cpi.hba_misc & PIM_NOSCAN) == 0) {
3899                         union   ccb *scan_ccb;
3900
3901                         /* Initiate bus rescan. */
3902                         scan_ccb = xpt_alloc_ccb_nowait();
3903                         if (scan_ccb != NULL) {
3904                                 scan_ccb->ccb_h.path = path;
3905                                 scan_ccb->ccb_h.func_code = XPT_SCAN_BUS;
3906                                 scan_ccb->crcn.flags = 0;
3907                                 xpt_rescan(scan_ccb);
3908                         } else {
3909                                 xpt_print(path,
3910                                           "Can't allocate CCB to scan bus\n");
3911                                 xpt_free_path(path);
3912                         }
3913                 } else
3914                         xpt_free_path(path);
3915         } else
3916                 xpt_free_path(path);
3917         return (CAM_SUCCESS);
3918 }
3919
3920 int32_t
3921 xpt_bus_deregister(path_id_t pathid)
3922 {
3923         struct cam_path bus_path;
3924         cam_status status;
3925
3926         status = xpt_compile_path(&bus_path, NULL, pathid,
3927                                   CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD);
3928         if (status != CAM_REQ_CMP)
3929                 return (status);
3930
3931         xpt_async(AC_LOST_DEVICE, &bus_path, NULL);
3932         xpt_async(AC_PATH_DEREGISTERED, &bus_path, NULL);
3933
3934         /* Release the reference count held while registered. */
3935         xpt_release_bus(bus_path.bus);
3936         xpt_release_path(&bus_path);
3937
3938         return (CAM_REQ_CMP);
3939 }
3940
3941 static path_id_t
3942 xptnextfreepathid(void)
3943 {
3944         struct cam_eb *bus;
3945         path_id_t pathid;
3946         const char *strval;
3947
3948         mtx_assert(&xsoftc.xpt_topo_lock, MA_OWNED);
3949         pathid = 0;
3950         bus = TAILQ_FIRST(&xsoftc.xpt_busses);
3951 retry:
3952         /* Find an unoccupied pathid */
3953         while (bus != NULL && bus->path_id <= pathid) {
3954                 if (bus->path_id == pathid)
3955                         pathid++;
3956                 bus = TAILQ_NEXT(bus, links);
3957         }
3958
3959         /*
3960          * Ensure that this pathid is not reserved for
3961          * a bus that may be registered in the future.
3962          */
3963         if (resource_string_value("scbus", pathid, "at", &strval) == 0) {
3964                 ++pathid;
3965                 /* Start the search over */
3966                 goto retry;
3967         }
3968         return (pathid);
3969 }
3970
3971 static path_id_t
3972 xptpathid(const char *sim_name, int sim_unit, int sim_bus)
3973 {
3974         path_id_t pathid;
3975         int i, dunit, val;
3976         char buf[32];
3977         const char *dname;
3978
3979         pathid = CAM_XPT_PATH_ID;
3980         snprintf(buf, sizeof(buf), "%s%d", sim_name, sim_unit);
3981         if (strcmp(buf, "xpt0") == 0 && sim_bus == 0)
3982                 return (pathid);
3983         i = 0;
3984         while ((resource_find_match(&i, &dname, &dunit, "at", buf)) == 0) {
3985                 if (strcmp(dname, "scbus")) {
3986                         /* Avoid a bit of foot shooting. */
3987                         continue;
3988                 }
3989                 if (dunit < 0)          /* unwired?! */
3990                         continue;
3991                 if (resource_int_value("scbus", dunit, "bus", &val) == 0) {
3992                         if (sim_bus == val) {
3993                                 pathid = dunit;
3994                                 break;
3995                         }
3996                 } else if (sim_bus == 0) {
3997                         /* Unspecified matches bus 0 */
3998                         pathid = dunit;
3999                         break;
4000                 } else {
4001                         printf("Ambiguous scbus configuration for %s%d "
4002                                "bus %d, cannot wire down.  The kernel "
4003                                "config entry for scbus%d should "
4004                                "specify a controller bus.\n"
4005                                "Scbus will be assigned dynamically.\n",
4006                                sim_name, sim_unit, sim_bus, dunit);
4007                         break;
4008                 }
4009         }
4010
4011         if (pathid == CAM_XPT_PATH_ID)
4012                 pathid = xptnextfreepathid();
4013         return (pathid);
4014 }
4015
4016 static const char *
4017 xpt_async_string(u_int32_t async_code)
4018 {
4019
4020         switch (async_code) {
4021         case AC_BUS_RESET: return ("AC_BUS_RESET");
4022         case AC_UNSOL_RESEL: return ("AC_UNSOL_RESEL");
4023         case AC_SCSI_AEN: return ("AC_SCSI_AEN");
4024         case AC_SENT_BDR: return ("AC_SENT_BDR");
4025         case AC_PATH_REGISTERED: return ("AC_PATH_REGISTERED");
4026         case AC_PATH_DEREGISTERED: return ("AC_PATH_DEREGISTERED");
4027         case AC_FOUND_DEVICE: return ("AC_FOUND_DEVICE");
4028         case AC_LOST_DEVICE: return ("AC_LOST_DEVICE");
4029         case AC_TRANSFER_NEG: return ("AC_TRANSFER_NEG");
4030         case AC_INQ_CHANGED: return ("AC_INQ_CHANGED");
4031         case AC_GETDEV_CHANGED: return ("AC_GETDEV_CHANGED");
4032         case AC_CONTRACT: return ("AC_CONTRACT");
4033         case AC_ADVINFO_CHANGED: return ("AC_ADVINFO_CHANGED");
4034         case AC_UNIT_ATTENTION: return ("AC_UNIT_ATTENTION");
4035         }
4036         return ("AC_UNKNOWN");
4037 }
4038
4039 static int
4040 xpt_async_size(u_int32_t async_code)
4041 {
4042
4043         switch (async_code) {
4044         case AC_BUS_RESET: return (0);
4045         case AC_UNSOL_RESEL: return (0);
4046         case AC_SCSI_AEN: return (0);
4047         case AC_SENT_BDR: return (0);
4048         case AC_PATH_REGISTERED: return (sizeof(struct ccb_pathinq));
4049         case AC_PATH_DEREGISTERED: return (0);
4050         case AC_FOUND_DEVICE: return (sizeof(struct ccb_getdev));
4051         case AC_LOST_DEVICE: return (0);
4052         case AC_TRANSFER_NEG: return (sizeof(struct ccb_trans_settings));
4053         case AC_INQ_CHANGED: return (0);
4054         case AC_GETDEV_CHANGED: return (0);
4055         case AC_CONTRACT: return (sizeof(struct ac_contract));
4056         case AC_ADVINFO_CHANGED: return (-1);
4057         case AC_UNIT_ATTENTION: return (sizeof(struct ccb_scsiio));
4058         }
4059         return (0);
4060 }
4061
4062 static int
4063 xpt_async_process_dev(struct cam_ed *device, void *arg)
4064 {
4065         union ccb *ccb = arg;
4066         struct cam_path *path = ccb->ccb_h.path;
4067         void *async_arg = ccb->casync.async_arg_ptr;
4068         u_int32_t async_code = ccb->casync.async_code;
4069         int relock;
4070
4071         if (path->device != device
4072          && path->device->lun_id != CAM_LUN_WILDCARD
4073          && device->lun_id != CAM_LUN_WILDCARD)
4074                 return (1);
4075
4076         /*
4077          * The async callback could free the device.
4078          * If it is a broadcast async, it doesn't hold
4079          * device reference, so take our own reference.
4080          */
4081         xpt_acquire_device(device);
4082
4083         /*
4084          * If async for specific device is to be delivered to
4085          * the wildcard client, take the specific device lock.
4086          * XXX: We may need a way for client to specify it.
4087          */
4088         if ((device->lun_id == CAM_LUN_WILDCARD &&
4089              path->device->lun_id != CAM_LUN_WILDCARD) ||
4090             (device->target->target_id == CAM_TARGET_WILDCARD &&
4091              path->target->target_id != CAM_TARGET_WILDCARD) ||
4092             (device->target->bus->path_id == CAM_BUS_WILDCARD &&
4093              path->target->bus->path_id != CAM_BUS_WILDCARD)) {
4094                 mtx_unlock(&device->device_mtx);
4095                 xpt_path_lock(path);
4096                 relock = 1;
4097         } else
4098                 relock = 0;
4099
4100         (*(device->target->bus->xport->async))(async_code,
4101             device->target->bus, device->target, device, async_arg);
4102         xpt_async_bcast(&device->asyncs, async_code, path, async_arg);
4103
4104         if (relock) {
4105                 xpt_path_unlock(path);
4106                 mtx_lock(&device->device_mtx);
4107         }
4108         xpt_release_device(device);
4109         return (1);
4110 }
4111
4112 static int
4113 xpt_async_process_tgt(struct cam_et *target, void *arg)
4114 {
4115         union ccb *ccb = arg;
4116         struct cam_path *path = ccb->ccb_h.path;
4117
4118         if (path->target != target
4119          && path->target->target_id != CAM_TARGET_WILDCARD
4120          && target->target_id != CAM_TARGET_WILDCARD)
4121                 return (1);
4122
4123         if (ccb->casync.async_code == AC_SENT_BDR) {
4124                 /* Update our notion of when the last reset occurred */
4125                 microtime(&target->last_reset);
4126         }
4127
4128         return (xptdevicetraverse(target, NULL, xpt_async_process_dev, ccb));
4129 }
4130
4131 static void
4132 xpt_async_process(struct cam_periph *periph, union ccb *ccb)
4133 {
4134         struct cam_eb *bus;
4135         struct cam_path *path;
4136         void *async_arg;
4137         u_int32_t async_code;
4138
4139         path = ccb->ccb_h.path;
4140         async_code = ccb->casync.async_code;
4141         async_arg = ccb->casync.async_arg_ptr;
4142         CAM_DEBUG(path, CAM_DEBUG_TRACE | CAM_DEBUG_INFO,
4143             ("xpt_async(%s)\n", xpt_async_string(async_code)));
4144         bus = path->bus;
4145
4146         if (async_code == AC_BUS_RESET) {
4147                 /* Update our notion of when the last reset occurred */
4148                 microtime(&bus->last_reset);
4149         }
4150
4151         xpttargettraverse(bus, NULL, xpt_async_process_tgt, ccb);
4152
4153         /*
4154          * If this wasn't a fully wildcarded async, tell all
4155          * clients that want all async events.
4156          */
4157         if (bus != xpt_periph->path->bus) {
4158                 xpt_path_lock(xpt_periph->path);
4159                 xpt_async_process_dev(xpt_periph->path->device, ccb);
4160                 xpt_path_unlock(xpt_periph->path);
4161         }
4162
4163         if (path->device != NULL && path->device->lun_id != CAM_LUN_WILDCARD)
4164                 xpt_release_devq(path, 1, TRUE);
4165         else
4166                 xpt_release_simq(path->bus->sim, TRUE);
4167         if (ccb->casync.async_arg_size > 0)
4168                 free(async_arg, M_CAMXPT);
4169         xpt_free_path(path);
4170         xpt_free_ccb(ccb);
4171 }
4172
4173 static void
4174 xpt_async_bcast(struct async_list *async_head,
4175                 u_int32_t async_code,
4176                 struct cam_path *path, void *async_arg)
4177 {
4178         struct async_node *cur_entry;
4179         int lock;
4180
4181         cur_entry = SLIST_FIRST(async_head);
4182         while (cur_entry != NULL) {
4183                 struct async_node *next_entry;
4184                 /*
4185                  * Grab the next list entry before we call the current
4186                  * entry's callback.  This is because the callback function
4187                  * can delete its async callback entry.
4188                  */
4189                 next_entry = SLIST_NEXT(cur_entry, links);
4190                 if ((cur_entry->event_enable & async_code) != 0) {
4191                         lock = cur_entry->event_lock;
4192                         if (lock)
4193                                 CAM_SIM_LOCK(path->device->sim);
4194                         cur_entry->callback(cur_entry->callback_arg,
4195                                             async_code, path,
4196                                             async_arg);
4197                         if (lock)
4198                                 CAM_SIM_UNLOCK(path->device->sim);
4199                 }
4200                 cur_entry = next_entry;
4201         }
4202 }
4203
4204 void
4205 xpt_async(u_int32_t async_code, struct cam_path *path, void *async_arg)
4206 {
4207         union ccb *ccb;
4208         int size;
4209
4210         ccb = xpt_alloc_ccb_nowait();
4211         if (ccb == NULL) {
4212                 xpt_print(path, "Can't allocate CCB to send %s\n",
4213                     xpt_async_string(async_code));
4214                 return;
4215         }
4216
4217         if (xpt_clone_path(&ccb->ccb_h.path, path) != CAM_REQ_CMP) {
4218                 xpt_print(path, "Can't allocate path to send %s\n",
4219                     xpt_async_string(async_code));
4220                 xpt_free_ccb(ccb);
4221                 return;
4222         }
4223         ccb->ccb_h.path->periph = NULL;
4224         ccb->ccb_h.func_code = XPT_ASYNC;
4225         ccb->ccb_h.cbfcnp = xpt_async_process;
4226         ccb->ccb_h.flags |= CAM_UNLOCKED;
4227         ccb->casync.async_code = async_code;
4228         ccb->casync.async_arg_size = 0;
4229         size = xpt_async_size(async_code);
4230         if (size > 0 && async_arg != NULL) {
4231                 ccb->casync.async_arg_ptr = malloc(size, M_CAMXPT, M_NOWAIT);
4232                 if (ccb->casync.async_arg_ptr == NULL) {
4233                         xpt_print(path, "Can't allocate argument to send %s\n",
4234                             xpt_async_string(async_code));
4235                         xpt_free_path(ccb->ccb_h.path);
4236                         xpt_free_ccb(ccb);
4237                         return;
4238                 }
4239                 memcpy(ccb->casync.async_arg_ptr, async_arg, size);
4240                 ccb->casync.async_arg_size = size;
4241         } else if (size < 0) {
4242                 ccb->casync.async_arg_ptr = async_arg;
4243                 ccb->casync.async_arg_size = size;
4244         }
4245         if (path->device != NULL && path->device->lun_id != CAM_LUN_WILDCARD)
4246                 xpt_freeze_devq(path, 1);
4247         else
4248                 xpt_freeze_simq(path->bus->sim, 1);
4249         xpt_done(ccb);
4250 }
4251
4252 static void
4253 xpt_dev_async_default(u_int32_t async_code, struct cam_eb *bus,
4254                       struct cam_et *target, struct cam_ed *device,
4255                       void *async_arg)
4256 {
4257
4258         /*
4259          * We only need to handle events for real devices.
4260          */
4261         if (target->target_id == CAM_TARGET_WILDCARD
4262          || device->lun_id == CAM_LUN_WILDCARD)
4263                 return;
4264
4265         printf("%s called\n", __func__);
4266 }
4267
4268 static uint32_t
4269 xpt_freeze_devq_device(struct cam_ed *dev, u_int count)
4270 {
4271         struct cam_devq *devq;
4272         uint32_t freeze;
4273
4274         devq = dev->sim->devq;
4275         mtx_assert(&devq->send_mtx, MA_OWNED);
4276         CAM_DEBUG_DEV(dev, CAM_DEBUG_TRACE,
4277             ("xpt_freeze_devq_device(%d) %u->%u\n", count,
4278             dev->ccbq.queue.qfrozen_cnt, dev->ccbq.queue.qfrozen_cnt + count));
4279         freeze = (dev->ccbq.queue.qfrozen_cnt += count);
4280         /* Remove frozen device from sendq. */
4281         if (device_is_queued(dev))
4282                 camq_remove(&devq->send_queue, dev->devq_entry.index);
4283         return (freeze);
4284 }
4285
4286 u_int32_t
4287 xpt_freeze_devq(struct cam_path *path, u_int count)
4288 {
4289         struct cam_ed   *dev = path->device;
4290         struct cam_devq *devq;
4291         uint32_t         freeze;
4292
4293         devq = dev->sim->devq;
4294         mtx_lock(&devq->send_mtx);
4295         CAM_DEBUG(path, CAM_DEBUG_TRACE, ("xpt_freeze_devq(%d)\n", count));
4296         freeze = xpt_freeze_devq_device(dev, count);
4297         mtx_unlock(&devq->send_mtx);
4298         return (freeze);
4299 }
4300
4301 u_int32_t
4302 xpt_freeze_simq(struct cam_sim *sim, u_int count)
4303 {
4304         struct cam_devq *devq;
4305         uint32_t         freeze;
4306
4307         devq = sim->devq;
4308         mtx_lock(&devq->send_mtx);
4309         freeze = (devq->send_queue.qfrozen_cnt += count);
4310         mtx_unlock(&devq->send_mtx);
4311         return (freeze);
4312 }
4313
4314 static void
4315 xpt_release_devq_timeout(void *arg)
4316 {
4317         struct cam_ed *dev;
4318         struct cam_devq *devq;
4319
4320         dev = (struct cam_ed *)arg;
4321         CAM_DEBUG_DEV(dev, CAM_DEBUG_TRACE, ("xpt_release_devq_timeout\n"));
4322         devq = dev->sim->devq;
4323         mtx_assert(&devq->send_mtx, MA_OWNED);
4324         if (xpt_release_devq_device(dev, /*count*/1, /*run_queue*/TRUE))
4325                 xpt_run_devq(devq);
4326 }
4327
4328 void
4329 xpt_release_devq(struct cam_path *path, u_int count, int run_queue)
4330 {
4331         struct cam_ed *dev;
4332         struct cam_devq *devq;
4333
4334         CAM_DEBUG(path, CAM_DEBUG_TRACE, ("xpt_release_devq(%d, %d)\n",
4335             count, run_queue));
4336         dev = path->device;
4337         devq = dev->sim->devq;
4338         mtx_lock(&devq->send_mtx);
4339         if (xpt_release_devq_device(dev, count, run_queue))
4340                 xpt_run_devq(dev->sim->devq);
4341         mtx_unlock(&devq->send_mtx);
4342 }
4343
4344 static int
4345 xpt_release_devq_device(struct cam_ed *dev, u_int count, int run_queue)
4346 {
4347
4348         mtx_assert(&dev->sim->devq->send_mtx, MA_OWNED);
4349         CAM_DEBUG_DEV(dev, CAM_DEBUG_TRACE,
4350             ("xpt_release_devq_device(%d, %d) %u->%u\n", count, run_queue,
4351             dev->ccbq.queue.qfrozen_cnt, dev->ccbq.queue.qfrozen_cnt - count));
4352         if (count > dev->ccbq.queue.qfrozen_cnt) {
4353 #ifdef INVARIANTS
4354                 printf("xpt_release_devq(): requested %u > present %u\n",
4355                     count, dev->ccbq.queue.qfrozen_cnt);
4356 #endif
4357                 count = dev->ccbq.queue.qfrozen_cnt;
4358         }
4359         dev->ccbq.queue.qfrozen_cnt -= count;
4360         if (dev->ccbq.queue.qfrozen_cnt == 0) {
4361                 /*
4362                  * No longer need to wait for a successful
4363                  * command completion.
4364                  */
4365                 dev->flags &= ~CAM_DEV_REL_ON_COMPLETE;
4366                 /*
4367                  * Remove any timeouts that might be scheduled
4368                  * to release this queue.
4369                  */
4370                 if ((dev->flags & CAM_DEV_REL_TIMEOUT_PENDING) != 0) {
4371                         callout_stop(&dev->callout);
4372                         dev->flags &= ~CAM_DEV_REL_TIMEOUT_PENDING;
4373                 }
4374                 /*
4375                  * Now that we are unfrozen schedule the
4376                  * device so any pending transactions are
4377                  * run.
4378                  */
4379                 xpt_schedule_devq(dev->sim->devq, dev);
4380         } else
4381                 run_queue = 0;
4382         return (run_queue);
4383 }
4384
4385 void
4386 xpt_release_simq(struct cam_sim *sim, int run_queue)
4387 {
4388         struct cam_devq *devq;
4389
4390         devq = sim->devq;
4391         mtx_lock(&devq->send_mtx);
4392         if (devq->send_queue.qfrozen_cnt <= 0) {
4393 #ifdef INVARIANTS
4394                 printf("xpt_release_simq: requested 1 > present %u\n",
4395                     devq->send_queue.qfrozen_cnt);
4396 #endif
4397         } else
4398                 devq->send_queue.qfrozen_cnt--;
4399         if (devq->send_queue.qfrozen_cnt == 0) {
4400                 /*
4401                  * If there is a timeout scheduled to release this
4402                  * sim queue, remove it.  The queue frozen count is
4403                  * already at 0.
4404                  */
4405                 if ((sim->flags & CAM_SIM_REL_TIMEOUT_PENDING) != 0){
4406                         callout_stop(&sim->callout);
4407                         sim->flags &= ~CAM_SIM_REL_TIMEOUT_PENDING;
4408                 }
4409                 if (run_queue) {
4410                         /*
4411                          * Now that we are unfrozen run the send queue.
4412                          */
4413                         xpt_run_devq(sim->devq);
4414                 }
4415         }
4416         mtx_unlock(&devq->send_mtx);
4417 }
4418
4419 /*
4420  * XXX Appears to be unused.
4421  */
4422 static void
4423 xpt_release_simq_timeout(void *arg)
4424 {
4425         struct cam_sim *sim;
4426
4427         sim = (struct cam_sim *)arg;
4428         xpt_release_simq(sim, /* run_queue */ TRUE);
4429 }
4430
4431 void
4432 xpt_done(union ccb *done_ccb)
4433 {
4434         struct cam_doneq *queue;
4435         int     run, hash;
4436
4437         CAM_DEBUG(done_ccb->ccb_h.path, CAM_DEBUG_TRACE, ("xpt_done\n"));
4438         if ((done_ccb->ccb_h.func_code & XPT_FC_QUEUED) == 0)
4439                 return;
4440
4441         hash = (done_ccb->ccb_h.path_id + done_ccb->ccb_h.target_id +
4442             done_ccb->ccb_h.target_lun) % cam_num_doneqs;
4443         queue = &cam_doneqs[hash];
4444         mtx_lock(&queue->cam_doneq_mtx);
4445         run = (queue->cam_doneq_sleep && STAILQ_EMPTY(&queue->cam_doneq));
4446         STAILQ_INSERT_TAIL(&queue->cam_doneq, &done_ccb->ccb_h, sim_links.stqe);
4447         done_ccb->ccb_h.pinfo.index = CAM_DONEQ_INDEX;
4448         mtx_unlock(&queue->cam_doneq_mtx);
4449         if (run)
4450                 wakeup(&queue->cam_doneq);
4451 }
4452
4453 void
4454 xpt_done_direct(union ccb *done_ccb)
4455 {
4456
4457         CAM_DEBUG(done_ccb->ccb_h.path, CAM_DEBUG_TRACE, ("xpt_done_direct\n"));
4458         if ((done_ccb->ccb_h.func_code & XPT_FC_QUEUED) == 0)
4459                 return;
4460
4461         xpt_done_process(&done_ccb->ccb_h);
4462 }
4463
4464 union ccb *
4465 xpt_alloc_ccb()
4466 {
4467         union ccb *new_ccb;
4468
4469         new_ccb = malloc(sizeof(*new_ccb), M_CAMCCB, M_ZERO|M_WAITOK);
4470         return (new_ccb);
4471 }
4472
4473 union ccb *
4474 xpt_alloc_ccb_nowait()
4475 {
4476         union ccb *new_ccb;
4477
4478         new_ccb = malloc(sizeof(*new_ccb), M_CAMCCB, M_ZERO|M_NOWAIT);
4479         return (new_ccb);
4480 }
4481
4482 void
4483 xpt_free_ccb(union ccb *free_ccb)
4484 {
4485         free(free_ccb, M_CAMCCB);
4486 }
4487
4488
4489
4490 /* Private XPT functions */
4491
4492 /*
4493  * Get a CAM control block for the caller. Charge the structure to the device
4494  * referenced by the path.  If we don't have sufficient resources to allocate
4495  * more ccbs, we return NULL.
4496  */
4497 static union ccb *
4498 xpt_get_ccb_nowait(struct cam_periph *periph)
4499 {
4500         union ccb *new_ccb;
4501
4502         new_ccb = malloc(sizeof(*new_ccb), M_CAMCCB, M_ZERO|M_NOWAIT);
4503         if (new_ccb == NULL)
4504                 return (NULL);
4505         periph->periph_allocated++;
4506         cam_ccbq_take_opening(&periph->path->device->ccbq);
4507         return (new_ccb);
4508 }
4509
4510 static union ccb *
4511 xpt_get_ccb(struct cam_periph *periph)
4512 {
4513         union ccb *new_ccb;
4514
4515         cam_periph_unlock(periph);
4516         new_ccb = malloc(sizeof(*new_ccb), M_CAMCCB, M_ZERO|M_WAITOK);
4517         cam_periph_lock(periph);
4518         periph->periph_allocated++;
4519         cam_ccbq_take_opening(&periph->path->device->ccbq);
4520         return (new_ccb);
4521 }
4522
4523 union ccb *
4524 cam_periph_getccb(struct cam_periph *periph, u_int32_t priority)
4525 {
4526         struct ccb_hdr *ccb_h;
4527
4528         CAM_DEBUG(periph->path, CAM_DEBUG_TRACE, ("cam_periph_getccb\n"));
4529         cam_periph_assert(periph, MA_OWNED);
4530         while ((ccb_h = SLIST_FIRST(&periph->ccb_list)) == NULL ||
4531             ccb_h->pinfo.priority != priority) {
4532                 if (priority < periph->immediate_priority) {
4533                         periph->immediate_priority = priority;
4534                         xpt_run_allocq(periph, 0);
4535                 } else
4536                         cam_periph_sleep(periph, &periph->ccb_list, PRIBIO,
4537                             "cgticb", 0);
4538         }
4539         SLIST_REMOVE_HEAD(&periph->ccb_list, periph_links.sle);
4540         return ((union ccb *)ccb_h);
4541 }
4542
4543 static void
4544 xpt_acquire_bus(struct cam_eb *bus)
4545 {
4546
4547         xpt_lock_buses();
4548         bus->refcount++;
4549         xpt_unlock_buses();
4550 }
4551
4552 static void
4553 xpt_release_bus(struct cam_eb *bus)
4554 {
4555
4556         xpt_lock_buses();
4557         KASSERT(bus->refcount >= 1, ("bus->refcount >= 1"));
4558         if (--bus->refcount > 0) {
4559                 xpt_unlock_buses();
4560                 return;
4561         }
4562         TAILQ_REMOVE(&xsoftc.xpt_busses, bus, links);
4563         xsoftc.bus_generation++;
4564         xpt_unlock_buses();
4565         KASSERT(TAILQ_EMPTY(&bus->et_entries),
4566             ("destroying bus, but target list is not empty"));
4567         cam_sim_release(bus->sim);
4568         mtx_destroy(&bus->eb_mtx);
4569         free(bus, M_CAMXPT);
4570 }
4571
4572 static struct cam_et *
4573 xpt_alloc_target(struct cam_eb *bus, target_id_t target_id)
4574 {
4575         struct cam_et *cur_target, *target;
4576
4577         mtx_assert(&xsoftc.xpt_topo_lock, MA_OWNED);
4578         mtx_assert(&bus->eb_mtx, MA_OWNED);
4579         target = (struct cam_et *)malloc(sizeof(*target), M_CAMXPT,
4580                                          M_NOWAIT|M_ZERO);
4581         if (target == NULL)
4582                 return (NULL);
4583
4584         TAILQ_INIT(&target->ed_entries);
4585         target->bus = bus;
4586         target->target_id = target_id;
4587         target->refcount = 1;
4588         target->generation = 0;
4589         target->luns = NULL;
4590         mtx_init(&target->luns_mtx, "CAM LUNs lock", NULL, MTX_DEF);
4591         timevalclear(&target->last_reset);
4592         /*
4593          * Hold a reference to our parent bus so it
4594          * will not go away before we do.
4595          */
4596         bus->refcount++;
4597
4598         /* Insertion sort into our bus's target list */
4599         cur_target = TAILQ_FIRST(&bus->et_entries);
4600         while (cur_target != NULL && cur_target->target_id < target_id)
4601                 cur_target = TAILQ_NEXT(cur_target, links);
4602         if (cur_target != NULL) {
4603                 TAILQ_INSERT_BEFORE(cur_target, target, links);
4604         } else {
4605                 TAILQ_INSERT_TAIL(&bus->et_entries, target, links);
4606         }
4607         bus->generation++;
4608         return (target);
4609 }
4610
4611 static void
4612 xpt_acquire_target(struct cam_et *target)
4613 {
4614         struct cam_eb *bus = target->bus;
4615
4616         mtx_lock(&bus->eb_mtx);
4617         target->refcount++;
4618         mtx_unlock(&bus->eb_mtx);
4619 }
4620
4621 static void
4622 xpt_release_target(struct cam_et *target)
4623 {
4624         struct cam_eb *bus = target->bus;
4625
4626         mtx_lock(&bus->eb_mtx);
4627         if (--target->refcount > 0) {
4628                 mtx_unlock(&bus->eb_mtx);
4629                 return;
4630         }
4631         TAILQ_REMOVE(&bus->et_entries, target, links);
4632         bus->generation++;
4633         mtx_unlock(&bus->eb_mtx);
4634         KASSERT(TAILQ_EMPTY(&target->ed_entries),
4635             ("destroying target, but device list is not empty"));
4636         xpt_release_bus(bus);
4637         mtx_destroy(&target->luns_mtx);
4638         if (target->luns)
4639                 free(target->luns, M_CAMXPT);
4640         free(target, M_CAMXPT);
4641 }
4642
4643 static struct cam_ed *
4644 xpt_alloc_device_default(struct cam_eb *bus, struct cam_et *target,
4645                          lun_id_t lun_id)
4646 {
4647         struct cam_ed *device;
4648
4649         device = xpt_alloc_device(bus, target, lun_id);
4650         if (device == NULL)
4651                 return (NULL);
4652
4653         device->mintags = 1;
4654         device->maxtags = 1;
4655         return (device);
4656 }
4657
4658 static void
4659 xpt_destroy_device(void *context, int pending)
4660 {
4661         struct cam_ed   *device = context;
4662
4663         mtx_lock(&device->device_mtx);
4664         mtx_destroy(&device->device_mtx);
4665         free(device, M_CAMDEV);
4666 }
4667
4668 struct cam_ed *
4669 xpt_alloc_device(struct cam_eb *bus, struct cam_et *target, lun_id_t lun_id)
4670 {
4671         struct cam_ed   *cur_device, *device;
4672         struct cam_devq *devq;
4673         cam_status status;
4674
4675         mtx_assert(&bus->eb_mtx, MA_OWNED);
4676         /* Make space for us in the device queue on our bus */
4677         devq = bus->sim->devq;
4678         mtx_lock(&devq->send_mtx);
4679         status = cam_devq_resize(devq, devq->send_queue.array_size + 1);
4680         mtx_unlock(&devq->send_mtx);
4681         if (status != CAM_REQ_CMP)
4682                 return (NULL);
4683
4684         device = (struct cam_ed *)malloc(sizeof(*device),
4685                                          M_CAMDEV, M_NOWAIT|M_ZERO);
4686         if (device == NULL)
4687                 return (NULL);
4688
4689         cam_init_pinfo(&device->devq_entry);
4690         device->target = target;
4691         device->lun_id = lun_id;
4692         device->sim = bus->sim;
4693         if (cam_ccbq_init(&device->ccbq,
4694                           bus->sim->max_dev_openings) != 0) {
4695                 free(device, M_CAMDEV);
4696                 return (NULL);
4697         }
4698         SLIST_INIT(&device->asyncs);
4699         SLIST_INIT(&device->periphs);
4700         device->generation = 0;
4701         device->flags = CAM_DEV_UNCONFIGURED;
4702         device->tag_delay_count = 0;
4703         device->tag_saved_openings = 0;
4704         device->refcount = 1;
4705         mtx_init(&device->device_mtx, "CAM device lock", NULL, MTX_DEF);
4706         callout_init_mtx(&device->callout, &devq->send_mtx, 0);
4707         TASK_INIT(&device->device_destroy_task, 0, xpt_destroy_device, device);
4708         /*
4709          * Hold a reference to our parent bus so it
4710          * will not go away before we do.
4711          */
4712         target->refcount++;
4713
4714         cur_device = TAILQ_FIRST(&target->ed_entries);
4715         while (cur_device != NULL && cur_device->lun_id < lun_id)
4716                 cur_device = TAILQ_NEXT(cur_device, links);
4717         if (cur_device != NULL)
4718                 TAILQ_INSERT_BEFORE(cur_device, device, links);
4719         else
4720                 TAILQ_INSERT_TAIL(&target->ed_entries, device, links);
4721         target->generation++;
4722         return (device);
4723 }
4724
4725 void
4726 xpt_acquire_device(struct cam_ed *device)
4727 {
4728         struct cam_eb *bus = device->target->bus;
4729
4730         mtx_lock(&bus->eb_mtx);
4731         device->refcount++;
4732         mtx_unlock(&bus->eb_mtx);
4733 }
4734
4735 void
4736 xpt_release_device(struct cam_ed *device)
4737 {
4738         struct cam_eb *bus = device->target->bus;
4739         struct cam_devq *devq;
4740
4741         mtx_lock(&bus->eb_mtx);
4742         if (--device->refcount > 0) {
4743                 mtx_unlock(&bus->eb_mtx);
4744                 return;
4745         }
4746
4747         TAILQ_REMOVE(&device->target->ed_entries, device,links);
4748         device->target->generation++;
4749         mtx_unlock(&bus->eb_mtx);
4750
4751         /* Release our slot in the devq */
4752         devq = bus->sim->devq;
4753         mtx_lock(&devq->send_mtx);
4754         cam_devq_resize(devq, devq->send_queue.array_size - 1);
4755         mtx_unlock(&devq->send_mtx);
4756
4757         KASSERT(SLIST_EMPTY(&device->periphs),
4758             ("destroying device, but periphs list is not empty"));
4759         KASSERT(device->devq_entry.index == CAM_UNQUEUED_INDEX,
4760             ("destroying device while still queued for ccbs"));
4761
4762         if ((device->flags & CAM_DEV_REL_TIMEOUT_PENDING) != 0)
4763                 callout_stop(&device->callout);
4764
4765         xpt_release_target(device->target);
4766
4767         cam_ccbq_fini(&device->ccbq);
4768         /*
4769          * Free allocated memory.  free(9) does nothing if the
4770          * supplied pointer is NULL, so it is safe to call without
4771          * checking.
4772          */
4773         free(device->supported_vpds, M_CAMXPT);
4774         free(device->device_id, M_CAMXPT);
4775         free(device->ext_inq, M_CAMXPT);
4776         free(device->physpath, M_CAMXPT);
4777         free(device->rcap_buf, M_CAMXPT);
4778         free(device->serial_num, M_CAMXPT);
4779         taskqueue_enqueue(xsoftc.xpt_taskq, &device->device_destroy_task);
4780 }
4781
4782 u_int32_t
4783 xpt_dev_ccbq_resize(struct cam_path *path, int newopenings)
4784 {
4785         int     result;
4786         struct  cam_ed *dev;
4787
4788         dev = path->device;
4789         mtx_lock(&dev->sim->devq->send_mtx);
4790         result = cam_ccbq_resize(&dev->ccbq, newopenings);
4791         mtx_unlock(&dev->sim->devq->send_mtx);
4792         if ((dev->flags & CAM_DEV_TAG_AFTER_COUNT) != 0
4793          || (dev->inq_flags & SID_CmdQue) != 0)
4794                 dev->tag_saved_openings = newopenings;
4795         return (result);
4796 }
4797
4798 static struct cam_eb *
4799 xpt_find_bus(path_id_t path_id)
4800 {
4801         struct cam_eb *bus;
4802
4803         xpt_lock_buses();
4804         for (bus = TAILQ_FIRST(&xsoftc.xpt_busses);
4805              bus != NULL;
4806              bus = TAILQ_NEXT(bus, links)) {
4807                 if (bus->path_id == path_id) {
4808                         bus->refcount++;
4809                         break;
4810                 }
4811         }
4812         xpt_unlock_buses();
4813         return (bus);
4814 }
4815
4816 static struct cam_et *
4817 xpt_find_target(struct cam_eb *bus, target_id_t target_id)
4818 {
4819         struct cam_et *target;
4820
4821         mtx_assert(&bus->eb_mtx, MA_OWNED);
4822         for (target = TAILQ_FIRST(&bus->et_entries);
4823              target != NULL;
4824              target = TAILQ_NEXT(target, links)) {
4825                 if (target->target_id == target_id) {
4826                         target->refcount++;
4827                         break;
4828                 }
4829         }
4830         return (target);
4831 }
4832
4833 static struct cam_ed *
4834 xpt_find_device(struct cam_et *target, lun_id_t lun_id)
4835 {
4836         struct cam_ed *device;
4837
4838         mtx_assert(&target->bus->eb_mtx, MA_OWNED);
4839         for (device = TAILQ_FIRST(&target->ed_entries);
4840              device != NULL;
4841              device = TAILQ_NEXT(device, links)) {
4842                 if (device->lun_id == lun_id) {
4843                         device->refcount++;
4844                         break;
4845                 }
4846         }
4847         return (device);
4848 }
4849
4850 void
4851 xpt_start_tags(struct cam_path *path)
4852 {
4853         struct ccb_relsim crs;
4854         struct cam_ed *device;
4855         struct cam_sim *sim;
4856         int    newopenings;
4857
4858         device = path->device;
4859         sim = path->bus->sim;
4860         device->flags &= ~CAM_DEV_TAG_AFTER_COUNT;
4861         xpt_freeze_devq(path, /*count*/1);
4862         device->inq_flags |= SID_CmdQue;
4863         if (device->tag_saved_openings != 0)
4864                 newopenings = device->tag_saved_openings;
4865         else
4866                 newopenings = min(device->maxtags,
4867                                   sim->max_tagged_dev_openings);
4868         xpt_dev_ccbq_resize(path, newopenings);
4869         xpt_async(AC_GETDEV_CHANGED, path, NULL);
4870         xpt_setup_ccb(&crs.ccb_h, path, CAM_PRIORITY_NORMAL);
4871         crs.ccb_h.func_code = XPT_REL_SIMQ;
4872         crs.release_flags = RELSIM_RELEASE_AFTER_QEMPTY;
4873         crs.openings
4874             = crs.release_timeout
4875             = crs.qfrozen_cnt
4876             = 0;
4877         xpt_action((union ccb *)&crs);
4878 }
4879
4880 void
4881 xpt_stop_tags(struct cam_path *path)
4882 {
4883         struct ccb_relsim crs;
4884         struct cam_ed *device;
4885         struct cam_sim *sim;
4886
4887         device = path->device;
4888         sim = path->bus->sim;
4889         device->flags &= ~CAM_DEV_TAG_AFTER_COUNT;
4890         device->tag_delay_count = 0;
4891         xpt_freeze_devq(path, /*count*/1);
4892         device->inq_flags &= ~SID_CmdQue;
4893         xpt_dev_ccbq_resize(path, sim->max_dev_openings);
4894         xpt_async(AC_GETDEV_CHANGED, path, NULL);
4895         xpt_setup_ccb(&crs.ccb_h, path, CAM_PRIORITY_NORMAL);
4896         crs.ccb_h.func_code = XPT_REL_SIMQ;
4897         crs.release_flags = RELSIM_RELEASE_AFTER_QEMPTY;
4898         crs.openings
4899             = crs.release_timeout
4900             = crs.qfrozen_cnt
4901             = 0;
4902         xpt_action((union ccb *)&crs);
4903 }
4904
4905 static void
4906 xpt_boot_delay(void *arg)
4907 {
4908
4909         xpt_release_boot();
4910 }
4911
4912 static void
4913 xpt_config(void *arg)
4914 {
4915         /*
4916          * Now that interrupts are enabled, go find our devices
4917          */
4918         if (taskqueue_start_threads(&xsoftc.xpt_taskq, 1, PRIBIO, "CAM taskq"))
4919                 printf("xpt_config: failed to create taskqueue thread.\n");
4920
4921         /* Setup debugging path */
4922         if (cam_dflags != CAM_DEBUG_NONE) {
4923                 if (xpt_create_path(&cam_dpath, NULL,
4924                                     CAM_DEBUG_BUS, CAM_DEBUG_TARGET,
4925                                     CAM_DEBUG_LUN) != CAM_REQ_CMP) {
4926                         printf("xpt_config: xpt_create_path() failed for debug"
4927                                " target %d:%d:%d, debugging disabled\n",
4928                                CAM_DEBUG_BUS, CAM_DEBUG_TARGET, CAM_DEBUG_LUN);
4929                         cam_dflags = CAM_DEBUG_NONE;
4930                 }
4931         } else
4932                 cam_dpath = NULL;
4933
4934         periphdriver_init(1);
4935         xpt_hold_boot();
4936         callout_init(&xsoftc.boot_callout, 1);
4937         callout_reset_sbt(&xsoftc.boot_callout, SBT_1MS * xsoftc.boot_delay, 0,
4938             xpt_boot_delay, NULL, 0);
4939         /* Fire up rescan thread. */
4940         if (kproc_kthread_add(xpt_scanner_thread, NULL, &cam_proc, NULL, 0, 0,
4941             "cam", "scanner")) {
4942                 printf("xpt_config: failed to create rescan thread.\n");
4943         }
4944 }
4945
4946 void
4947 xpt_hold_boot(void)
4948 {
4949         xpt_lock_buses();
4950         xsoftc.buses_to_config++;
4951         xpt_unlock_buses();
4952 }
4953
4954 void
4955 xpt_release_boot(void)
4956 {
4957         xpt_lock_buses();
4958         xsoftc.buses_to_config--;
4959         if (xsoftc.buses_to_config == 0 && xsoftc.buses_config_done == 0) {
4960                 struct  xpt_task *task;
4961
4962                 xsoftc.buses_config_done = 1;
4963                 xpt_unlock_buses();
4964                 /* Call manually because we don't have any busses */
4965                 task = malloc(sizeof(struct xpt_task), M_CAMXPT, M_NOWAIT);
4966                 if (task != NULL) {
4967                         TASK_INIT(&task->task, 0, xpt_finishconfig_task, task);
4968                         taskqueue_enqueue(taskqueue_thread, &task->task);
4969                 }
4970         } else
4971                 xpt_unlock_buses();
4972 }
4973
4974 /*
4975  * If the given device only has one peripheral attached to it, and if that
4976  * peripheral is the passthrough driver, announce it.  This insures that the
4977  * user sees some sort of announcement for every peripheral in their system.
4978  */
4979 static int
4980 xptpassannouncefunc(struct cam_ed *device, void *arg)
4981 {
4982         struct cam_periph *periph;
4983         int i;
4984
4985         for (periph = SLIST_FIRST(&device->periphs), i = 0; periph != NULL;
4986              periph = SLIST_NEXT(periph, periph_links), i++);
4987
4988         periph = SLIST_FIRST(&device->periphs);
4989         if ((i == 1)
4990          && (strncmp(periph->periph_name, "pass", 4) == 0))
4991                 xpt_announce_periph(periph, NULL);
4992
4993         return(1);
4994 }
4995
4996 static void
4997 xpt_finishconfig_task(void *context, int pending)
4998 {
4999
5000         periphdriver_init(2);
5001         /*
5002          * Check for devices with no "standard" peripheral driver
5003          * attached.  For any devices like that, announce the
5004          * passthrough driver so the user will see something.
5005          */
5006         if (!bootverbose)
5007                 xpt_for_all_devices(xptpassannouncefunc, NULL);
5008
5009         /* Release our hook so that the boot can continue. */
5010         config_intrhook_disestablish(xsoftc.xpt_config_hook);
5011         free(xsoftc.xpt_config_hook, M_CAMXPT);
5012         xsoftc.xpt_config_hook = NULL;
5013
5014         free(context, M_CAMXPT);
5015 }
5016
5017 cam_status
5018 xpt_register_async(int event, ac_callback_t *cbfunc, void *cbarg,
5019                    struct cam_path *path)
5020 {
5021         struct ccb_setasync csa;
5022         cam_status status;
5023         int xptpath = 0;
5024
5025         if (path == NULL) {
5026                 status = xpt_create_path(&path, /*periph*/NULL, CAM_XPT_PATH_ID,
5027                                          CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD);
5028                 if (status != CAM_REQ_CMP)
5029                         return (status);
5030                 xpt_path_lock(path);
5031                 xptpath = 1;
5032         }
5033
5034         xpt_setup_ccb(&csa.ccb_h, path, CAM_PRIORITY_NORMAL);
5035         csa.ccb_h.func_code = XPT_SASYNC_CB;
5036         csa.event_enable = event;
5037         csa.callback = cbfunc;
5038         csa.callback_arg = cbarg;
5039         xpt_action((union ccb *)&csa);
5040         status = csa.ccb_h.status;
5041
5042         if (xptpath) {
5043                 xpt_path_unlock(path);
5044                 xpt_free_path(path);
5045         }
5046
5047         if ((status == CAM_REQ_CMP) &&
5048             (csa.event_enable & AC_FOUND_DEVICE)) {
5049                 /*
5050                  * Get this peripheral up to date with all
5051                  * the currently existing devices.
5052                  */
5053                 xpt_for_all_devices(xptsetasyncfunc, &csa);
5054         }
5055         if ((status == CAM_REQ_CMP) &&
5056             (csa.event_enable & AC_PATH_REGISTERED)) {
5057                 /*
5058                  * Get this peripheral up to date with all
5059                  * the currently existing busses.
5060                  */
5061                 xpt_for_all_busses(xptsetasyncbusfunc, &csa);
5062         }
5063
5064         return (status);
5065 }
5066
5067 static void
5068 xptaction(struct cam_sim *sim, union ccb *work_ccb)
5069 {
5070         CAM_DEBUG(work_ccb->ccb_h.path, CAM_DEBUG_TRACE, ("xptaction\n"));
5071
5072         switch (work_ccb->ccb_h.func_code) {
5073         /* Common cases first */
5074         case XPT_PATH_INQ:              /* Path routing inquiry */
5075         {
5076                 struct ccb_pathinq *cpi;
5077
5078                 cpi = &work_ccb->cpi;
5079                 cpi->version_num = 1; /* XXX??? */
5080                 cpi->hba_inquiry = 0;
5081                 cpi->target_sprt = 0;
5082                 cpi->hba_misc = 0;
5083                 cpi->hba_eng_cnt = 0;
5084                 cpi->max_target = 0;
5085                 cpi->max_lun = 0;
5086                 cpi->initiator_id = 0;
5087                 strncpy(cpi->sim_vid, "FreeBSD", SIM_IDLEN);
5088                 strncpy(cpi->hba_vid, "", HBA_IDLEN);
5089                 strncpy(cpi->dev_name, sim->sim_name, DEV_IDLEN);
5090                 cpi->unit_number = sim->unit_number;
5091                 cpi->bus_id = sim->bus_id;
5092                 cpi->base_transfer_speed = 0;
5093                 cpi->protocol = PROTO_UNSPECIFIED;
5094                 cpi->protocol_version = PROTO_VERSION_UNSPECIFIED;
5095                 cpi->transport = XPORT_UNSPECIFIED;
5096                 cpi->transport_version = XPORT_VERSION_UNSPECIFIED;
5097                 cpi->ccb_h.status = CAM_REQ_CMP;
5098                 xpt_done(work_ccb);
5099                 break;
5100         }
5101         default:
5102                 work_ccb->ccb_h.status = CAM_REQ_INVALID;
5103                 xpt_done(work_ccb);
5104                 break;
5105         }
5106 }
5107
5108 /*
5109  * The xpt as a "controller" has no interrupt sources, so polling
5110  * is a no-op.
5111  */
5112 static void
5113 xptpoll(struct cam_sim *sim)
5114 {
5115 }
5116
5117 void
5118 xpt_lock_buses(void)
5119 {
5120         mtx_lock(&xsoftc.xpt_topo_lock);
5121 }
5122
5123 void
5124 xpt_unlock_buses(void)
5125 {
5126         mtx_unlock(&xsoftc.xpt_topo_lock);
5127 }
5128
5129 struct mtx *
5130 xpt_path_mtx(struct cam_path *path)
5131 {
5132
5133         return (&path->device->device_mtx);
5134 }
5135
5136 static void
5137 xpt_done_process(struct ccb_hdr *ccb_h)
5138 {
5139         struct cam_sim *sim;
5140         struct cam_devq *devq;
5141         struct mtx *mtx = NULL;
5142
5143         if (ccb_h->flags & CAM_HIGH_POWER) {
5144                 struct highpowerlist    *hphead;
5145                 struct cam_ed           *device;
5146
5147                 mtx_lock(&xsoftc.xpt_highpower_lock);
5148                 hphead = &xsoftc.highpowerq;
5149
5150                 device = STAILQ_FIRST(hphead);
5151
5152                 /*
5153                  * Increment the count since this command is done.
5154                  */
5155                 xsoftc.num_highpower++;
5156
5157                 /*
5158                  * Any high powered commands queued up?
5159                  */
5160                 if (device != NULL) {
5161
5162                         STAILQ_REMOVE_HEAD(hphead, highpowerq_entry);
5163                         mtx_unlock(&xsoftc.xpt_highpower_lock);
5164
5165                         mtx_lock(&device->sim->devq->send_mtx);
5166                         xpt_release_devq_device(device,
5167                                          /*count*/1, /*runqueue*/TRUE);
5168                         mtx_unlock(&device->sim->devq->send_mtx);
5169                 } else
5170                         mtx_unlock(&xsoftc.xpt_highpower_lock);
5171         }
5172
5173         sim = ccb_h->path->bus->sim;
5174
5175         if (ccb_h->status & CAM_RELEASE_SIMQ) {
5176                 xpt_release_simq(sim, /*run_queue*/FALSE);
5177                 ccb_h->status &= ~CAM_RELEASE_SIMQ;
5178         }
5179
5180         if ((ccb_h->flags & CAM_DEV_QFRZDIS)
5181          && (ccb_h->status & CAM_DEV_QFRZN)) {
5182                 xpt_release_devq(ccb_h->path, /*count*/1, /*run_queue*/TRUE);
5183                 ccb_h->status &= ~CAM_DEV_QFRZN;
5184         }
5185
5186         devq = sim->devq;
5187         if ((ccb_h->func_code & XPT_FC_USER_CCB) == 0) {
5188                 struct cam_ed *dev = ccb_h->path->device;
5189
5190                 mtx_lock(&devq->send_mtx);
5191                 devq->send_active--;
5192                 devq->send_openings++;
5193                 cam_ccbq_ccb_done(&dev->ccbq, (union ccb *)ccb_h);
5194
5195                 if (((dev->flags & CAM_DEV_REL_ON_QUEUE_EMPTY) != 0
5196                   && (dev->ccbq.dev_active == 0))) {
5197                         dev->flags &= ~CAM_DEV_REL_ON_QUEUE_EMPTY;
5198                         xpt_release_devq_device(dev, /*count*/1,
5199                                          /*run_queue*/FALSE);
5200                 }
5201
5202                 if (((dev->flags & CAM_DEV_REL_ON_COMPLETE) != 0
5203                   && (ccb_h->status&CAM_STATUS_MASK) != CAM_REQUEUE_REQ)) {
5204                         dev->flags &= ~CAM_DEV_REL_ON_COMPLETE;
5205                         xpt_release_devq_device(dev, /*count*/1,
5206                                          /*run_queue*/FALSE);
5207                 }
5208
5209                 if (!device_is_queued(dev))
5210                         (void)xpt_schedule_devq(devq, dev);
5211                 xpt_run_devq(devq);
5212                 mtx_unlock(&devq->send_mtx);
5213
5214                 if ((dev->flags & CAM_DEV_TAG_AFTER_COUNT) != 0) {
5215                         mtx = xpt_path_mtx(ccb_h->path);
5216                         mtx_lock(mtx);
5217
5218                         if ((dev->flags & CAM_DEV_TAG_AFTER_COUNT) != 0
5219                          && (--dev->tag_delay_count == 0))
5220                                 xpt_start_tags(ccb_h->path);
5221                 }
5222         }
5223
5224         if ((ccb_h->flags & CAM_UNLOCKED) == 0) {
5225                 if (mtx == NULL) {
5226                         mtx = xpt_path_mtx(ccb_h->path);
5227                         mtx_lock(mtx);
5228                 }
5229         } else {
5230                 if (mtx != NULL) {
5231                         mtx_unlock(mtx);
5232                         mtx = NULL;
5233                 }
5234         }
5235
5236         /* Call the peripheral driver's callback */
5237         ccb_h->pinfo.index = CAM_UNQUEUED_INDEX;
5238         (*ccb_h->cbfcnp)(ccb_h->path->periph, (union ccb *)ccb_h);
5239         if (mtx != NULL)
5240                 mtx_unlock(mtx);
5241 }
5242
5243 void
5244 xpt_done_td(void *arg)
5245 {
5246         struct cam_doneq *queue = arg;
5247         struct ccb_hdr *ccb_h;
5248         STAILQ_HEAD(, ccb_hdr)  doneq;
5249
5250         STAILQ_INIT(&doneq);
5251         mtx_lock(&queue->cam_doneq_mtx);
5252         while (1) {
5253                 while (STAILQ_EMPTY(&queue->cam_doneq)) {
5254                         queue->cam_doneq_sleep = 1;
5255                         msleep(&queue->cam_doneq, &queue->cam_doneq_mtx,
5256                             PRIBIO, "-", 0);
5257                         queue->cam_doneq_sleep = 0;
5258                 }
5259                 STAILQ_CONCAT(&doneq, &queue->cam_doneq);
5260                 mtx_unlock(&queue->cam_doneq_mtx);
5261
5262                 THREAD_NO_SLEEPING();
5263                 while ((ccb_h = STAILQ_FIRST(&doneq)) != NULL) {
5264                         STAILQ_REMOVE_HEAD(&doneq, sim_links.stqe);
5265                         xpt_done_process(ccb_h);
5266                 }
5267                 THREAD_SLEEPING_OK();
5268
5269                 mtx_lock(&queue->cam_doneq_mtx);
5270         }
5271 }
5272
5273 static void
5274 camisr_runqueue(void)
5275 {
5276         struct  ccb_hdr *ccb_h;
5277         struct cam_doneq *queue;
5278         int i;
5279
5280         /* Process global queues. */
5281         for (i = 0; i < cam_num_doneqs; i++) {
5282                 queue = &cam_doneqs[i];
5283                 mtx_lock(&queue->cam_doneq_mtx);
5284                 while ((ccb_h = STAILQ_FIRST(&queue->cam_doneq)) != NULL) {
5285                         STAILQ_REMOVE_HEAD(&queue->cam_doneq, sim_links.stqe);
5286                         mtx_unlock(&queue->cam_doneq_mtx);
5287                         xpt_done_process(ccb_h);
5288                         mtx_lock(&queue->cam_doneq_mtx);
5289                 }
5290                 mtx_unlock(&queue->cam_doneq_mtx);
5291         }
5292 }