sys/cddl/dev/dtrace/dtrace_ioctl.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  *
  21  * $FreeBSD$
  22  *
  23  */
  24
  25 static int dtrace_verbose_ioctl;
  26 SYSCTL_INT(_debug_dtrace, OID_AUTO, verbose_ioctl, CTLFLAG_RW,
  27     &dtrace_verbose_ioctl, 0, "log DTrace ioctls");
  28
  29 #define DTRACE_IOCTL_PRINTF(fmt, ...)   if (dtrace_verbose_ioctl) printf(fmt, ## __VA_ARGS__ )
  30
  31 static int
  32 dtrace_ioctl_helper(struct cdev *dev, u_long cmd, caddr_t addr, int flags,
  33     struct thread *td)
  34 {
  35         int rval;
  36         dof_helper_t *dhp = NULL;
  37         dof_hdr_t *dof = NULL;
  38
  39         switch (cmd) {
  40         case DTRACEHIOC_ADDDOF:
  41                 dhp = (dof_helper_t *)addr;
  42                 /* XXX all because dofhp_dof is 64 bit */
  43                 addr = (caddr_t)(vm_offset_t)dhp->dofhp_dof;
  44                 /* FALLTHROUGH */
  45         case DTRACEHIOC_ADD:
  46                 dof = dtrace_dof_copyin((intptr_t)addr, &rval);
  47
  48                 if (dof == NULL)
  49                         return (rval);
  50
  51                 mutex_enter(&dtrace_lock);
  52                 if ((rval = dtrace_helper_slurp((dof_hdr_t *)dof, dhp)) != -1) {
  53                         if (dhp) {
  54                                 dhp->gen = rval;
  55                                 copyout(dhp, addr, sizeof(*dhp));
  56                         }
  57                         rval = 0;
  58                 } else {
  59                         rval = EINVAL;
  60                 }
  61                 mutex_exit(&dtrace_lock);
  62                 return (rval);
  63         case DTRACEHIOC_REMOVE:
  64                 mutex_enter(&dtrace_lock);
  65                 rval = dtrace_helper_destroygen((int)*addr);
  66                 mutex_exit(&dtrace_lock);
  67
  68                 return (rval);
  69         default:
  70                 break;
  71         }
  72
  73         return (ENOTTY);
  74 }
  75
  76 /* ARGSUSED */
  77 static int
  78 dtrace_ioctl(struct cdev *dev, u_long cmd, caddr_t addr,
  79     int flags __unused, struct thread *td)
  80 {
  81         dtrace_state_t *state;
  82         devfs_get_cdevpriv((void **) &state);
  83
  84         int error = 0;
  85         if (state == NULL)
  86                 return (EINVAL);
  87
  88         if (state->dts_anon) {
  89                 ASSERT(dtrace_anon.dta_state == NULL);
  90                 state = state->dts_anon;
  91         }
  92
  93         switch (cmd) {
  94         case DTRACEIOC_AGGDESC: {
  95                 dtrace_aggdesc_t **paggdesc = (dtrace_aggdesc_t **) addr;
  96                 dtrace_aggdesc_t aggdesc;
  97                 dtrace_action_t *act;
  98                 dtrace_aggregation_t *agg;
  99                 int nrecs;
 100                 uint32_t offs;
 101                 dtrace_recdesc_t *lrec;
 102                 void *buf;
 103                 size_t size;
 104                 uintptr_t dest;
 105
 106                 DTRACE_IOCTL_PRINTF("%s(%d): DTRACEIOC_AGGDESC\n",__func__,__LINE__);
 107
 108                 if (copyin((void *) *paggdesc, &aggdesc, sizeof (aggdesc)) != 0)
 109                         return (EFAULT);
 110
 111                 mutex_enter(&dtrace_lock);
 112
 113                 if ((agg = dtrace_aggid2agg(state, aggdesc.dtagd_id)) == NULL) {
 114                         mutex_exit(&dtrace_lock);
 115                         return (EINVAL);
 116                 }
 117
 118                 aggdesc.dtagd_epid = agg->dtag_ecb->dte_epid;
 119
 120                 nrecs = aggdesc.dtagd_nrecs;
 121                 aggdesc.dtagd_nrecs = 0;
 122
 123                 offs = agg->dtag_base;
 124                 lrec = &agg->dtag_action.dta_rec;
 125                 aggdesc.dtagd_size = lrec->dtrd_offset + lrec->dtrd_size - offs;
 126
 127                 for (act = agg->dtag_first; ; act = act->dta_next) {
 128                         ASSERT(act->dta_intuple ||
 129                             DTRACEACT_ISAGG(act->dta_kind));
 130
 131                         /*
 132                          * If this action has a record size of zero, it
 133                          * denotes an argument to the aggregating action.
 134                          * Because the presence of this record doesn't (or
 135                          * shouldn't) affect the way the data is interpreted,
 136                          * we don't copy it out to save user-level the
 137                          * confusion of dealing with a zero-length record.
 138                          */
 139                         if (act->dta_rec.dtrd_size == 0) {
 140                                 ASSERT(agg->dtag_hasarg);
 141                                 continue;
 142                         }
 143
 144                         aggdesc.dtagd_nrecs++;
 145
 146                         if (act == &agg->dtag_action)
 147                                 break;
 148                 }
 149
 150                 /*
 151                  * Now that we have the size, we need to allocate a temporary
 152                  * buffer in which to store the complete description.  We need
 153                  * the temporary buffer to be able to drop dtrace_lock()
 154                  * across the copyout(), below.
 155                  */
 156                 size = sizeof (dtrace_aggdesc_t) +
 157                     (aggdesc.dtagd_nrecs * sizeof (dtrace_recdesc_t));
 158
 159                 buf = kmem_alloc(size, KM_SLEEP);
 160                 dest = (uintptr_t)buf;
 161
 162                 bcopy(&aggdesc, (void *)dest, sizeof (aggdesc));
 163                 dest += offsetof(dtrace_aggdesc_t, dtagd_rec[0]);
 164
 165                 for (act = agg->dtag_first; ; act = act->dta_next) {
 166                         dtrace_recdesc_t rec = act->dta_rec;
 167
 168                         /*
 169                          * See the comment in the above loop for why we pass
 170                          * over zero-length records.
 171                          */
 172                         if (rec.dtrd_size == 0) {
 173                                 ASSERT(agg->dtag_hasarg);
 174                                 continue;
 175                         }
 176
 177                         if (nrecs-- == 0)
 178                                 break;
 179
 180                         rec.dtrd_offset -= offs;
 181                         bcopy(&rec, (void *)dest, sizeof (rec));
 182                         dest += sizeof (dtrace_recdesc_t);
 183
 184                         if (act == &agg->dtag_action)
 185                                 break;
 186                 }
 187
 188                 mutex_exit(&dtrace_lock);
 189
 190                 if (copyout(buf, (void *) *paggdesc, dest - (uintptr_t)buf) != 0) {
 191                         kmem_free(buf, size);
 192                         return (EFAULT);
 193                 }
 194
 195                 kmem_free(buf, size);
 196                 return (0);
 197         }
 198         case DTRACEIOC_AGGSNAP:
 199         case DTRACEIOC_BUFSNAP: {
 200                 dtrace_bufdesc_t **pdesc = (dtrace_bufdesc_t **) addr;
 201                 dtrace_bufdesc_t desc;
 202                 caddr_t cached;
 203                 dtrace_buffer_t *buf;
 204
 205                 dtrace_debug_output();
 206
 207                 if (copyin((void *) *pdesc, &desc, sizeof (desc)) != 0)
 208                         return (EFAULT);
 209
 210                 DTRACE_IOCTL_PRINTF("%s(%d): %s curcpu %d cpu %d\n",
 211                     __func__,__LINE__,
 212                     cmd == DTRACEIOC_AGGSNAP ?
 213                     "DTRACEIOC_AGGSNAP":"DTRACEIOC_BUFSNAP",
 214                     curcpu, desc.dtbd_cpu);
 215
 216                 if (desc.dtbd_cpu >= NCPU)
 217                         return (ENOENT);
 218                 if (pcpu_find(desc.dtbd_cpu) == NULL)
 219                         return (ENOENT);
 220
 221                 mutex_enter(&dtrace_lock);
 222
 223                 if (cmd == DTRACEIOC_BUFSNAP) {
 224                         buf = &state->dts_buffer[desc.dtbd_cpu];
 225                 } else {
 226                         buf = &state->dts_aggbuffer[desc.dtbd_cpu];
 227                 }
 228
 229                 if (buf->dtb_flags & (DTRACEBUF_RING | DTRACEBUF_FILL)) {
 230                         size_t sz = buf->dtb_offset;
 231
 232                         if (state->dts_activity != DTRACE_ACTIVITY_STOPPED) {
 233                                 mutex_exit(&dtrace_lock);
 234                                 return (EBUSY);
 235                         }
 236
 237                         /*
 238                          * If this buffer has already been consumed, we're
 239                          * going to indicate that there's nothing left here
 240                          * to consume.
 241                          */
 242                         if (buf->dtb_flags & DTRACEBUF_CONSUMED) {
 243                                 mutex_exit(&dtrace_lock);
 244
 245                                 desc.dtbd_size = 0;
 246                                 desc.dtbd_drops = 0;
 247                                 desc.dtbd_errors = 0;
 248                                 desc.dtbd_oldest = 0;
 249                                 sz = sizeof (desc);
 250
 251                                 if (copyout(&desc, (void *) *pdesc, sz) != 0)
 252                                         return (EFAULT);
 253
 254                                 return (0);
 255                         }
 256
 257                         /*
 258                          * If this is a ring buffer that has wrapped, we want
 259                          * to copy the whole thing out.
 260                          */
 261                         if (buf->dtb_flags & DTRACEBUF_WRAPPED) {
 262                                 dtrace_buffer_polish(buf);
 263                                 sz = buf->dtb_size;
 264                         }
 265
 266                         if (copyout(buf->dtb_tomax, desc.dtbd_data, sz) != 0) {
 267                                 mutex_exit(&dtrace_lock);
 268                                 return (EFAULT);
 269                         }
 270
 271                         desc.dtbd_size = sz;
 272                         desc.dtbd_drops = buf->dtb_drops;
 273                         desc.dtbd_errors = buf->dtb_errors;
 274                         desc.dtbd_oldest = buf->dtb_xamot_offset;
 275                         desc.dtbd_timestamp = dtrace_gethrtime();
 276
 277                         mutex_exit(&dtrace_lock);
 278
 279                         if (copyout(&desc, (void *) *pdesc, sizeof (desc)) != 0)
 280                                 return (EFAULT);
 281
 282                         buf->dtb_flags |= DTRACEBUF_CONSUMED;
 283
 284                         return (0);
 285                 }
 286
 287                 if (buf->dtb_tomax == NULL) {
 288                         ASSERT(buf->dtb_xamot == NULL);
 289                         mutex_exit(&dtrace_lock);
 290                         return (ENOENT);
 291                 }
 292
 293                 cached = buf->dtb_tomax;
 294                 ASSERT(!(buf->dtb_flags & DTRACEBUF_NOSWITCH));
 295
 296                 dtrace_xcall(desc.dtbd_cpu,
 297                     (dtrace_xcall_t)dtrace_buffer_switch, buf);
 298
 299                 state->dts_errors += buf->dtb_xamot_errors;
 300
 301                 /*
 302                  * If the buffers did not actually switch, then the cross call
 303                  * did not take place -- presumably because the given CPU is
 304                  * not in the ready set.  If this is the case, we'll return
 305                  * ENOENT.
 306                  */
 307                 if (buf->dtb_tomax == cached) {
 308                         ASSERT(buf->dtb_xamot != cached);
 309                         mutex_exit(&dtrace_lock);
 310                         return (ENOENT);
 311                 }
 312
 313                 ASSERT(cached == buf->dtb_xamot);
 314
 315                 DTRACE_IOCTL_PRINTF("%s(%d): copyout the buffer snapshot\n",__func__,__LINE__);
 316
 317                 /*
 318                  * We have our snapshot; now copy it out.
 319                  */
 320                 if (copyout(buf->dtb_xamot, desc.dtbd_data,
 321                     buf->dtb_xamot_offset) != 0) {
 322                         mutex_exit(&dtrace_lock);
 323                         return (EFAULT);
 324                 }
 325
 326                 desc.dtbd_size = buf->dtb_xamot_offset;
 327                 desc.dtbd_drops = buf->dtb_xamot_drops;
 328                 desc.dtbd_errors = buf->dtb_xamot_errors;
 329                 desc.dtbd_oldest = 0;
 330                 desc.dtbd_timestamp = buf->dtb_switched;
 331
 332                 mutex_exit(&dtrace_lock);
 333
 334                 DTRACE_IOCTL_PRINTF("%s(%d): copyout buffer desc: size %zd drops %lu errors %lu\n",__func__,__LINE__,(size_t) desc.dtbd_size,(u_long) desc.dtbd_drops,(u_long) desc.dtbd_errors);
 335
 336                 /*
 337                  * Finally, copy out the buffer description.
 338                  */
 339                 if (copyout(&desc, (void *) *pdesc, sizeof (desc)) != 0)
 340                         return (EFAULT);
 341
 342                 return (0);
 343         }
 344         case DTRACEIOC_CONF: {
 345                 dtrace_conf_t conf;
 346
 347                 DTRACE_IOCTL_PRINTF("%s(%d): DTRACEIOC_CONF\n",__func__,__LINE__);
 348
 349                 bzero(&conf, sizeof (conf));
 350                 conf.dtc_difversion = DIF_VERSION;
 351                 conf.dtc_difintregs = DIF_DIR_NREGS;
 352                 conf.dtc_diftupregs = DIF_DTR_NREGS;
 353                 conf.dtc_ctfmodel = CTF_MODEL_NATIVE;
 354
 355                 *((dtrace_conf_t *) addr) = conf;
 356
 357                 return (0);
 358         }
 359         case DTRACEIOC_DOFGET: {
 360                 dof_hdr_t **pdof = (dof_hdr_t **) addr;
 361                 dof_hdr_t hdr, *dof = *pdof;
 362                 int rval;
 363                 uint64_t len;
 364
 365                 DTRACE_IOCTL_PRINTF("%s(%d): DTRACEIOC_DOFGET\n",__func__,__LINE__);
 366
 367                 if (copyin((void *)dof, &hdr, sizeof (hdr)) != 0)
 368                         return (EFAULT);
 369
 370                 mutex_enter(&dtrace_lock);
 371                 dof = dtrace_dof_create(state);
 372                 mutex_exit(&dtrace_lock);
 373
 374                 len = MIN(hdr.dofh_loadsz, dof->dofh_loadsz);
 375                 rval = copyout(dof, (void *) *pdof, len);
 376                 dtrace_dof_destroy(dof);
 377
 378                 return (rval == 0 ? 0 : EFAULT);
 379         }
 380         case DTRACEIOC_ENABLE: {
 381                 dof_hdr_t *dof = NULL;
 382                 dtrace_enabling_t *enab = NULL;
 383                 dtrace_vstate_t *vstate;
 384                 int err = 0;
 385                 int rval;
 386                 dtrace_enable_io_t *p = (dtrace_enable_io_t *) addr;
 387
 388                 DTRACE_IOCTL_PRINTF("%s(%d): DTRACEIOC_ENABLE\n",__func__,__LINE__);
 389
 390                 /*
 391                  * If a NULL argument has been passed, we take this as our
 392                  * cue to reevaluate our enablings.
 393                  */
 394                 if (p->dof == NULL) {
 395                         dtrace_enabling_matchall();
 396
 397                         return (0);
 398                 }
 399
 400                 if ((dof = dtrace_dof_copyin((uintptr_t) p->dof, &rval)) == NULL)
 401                         return (EINVAL);
 402
 403                 mutex_enter(&cpu_lock);
 404                 mutex_enter(&dtrace_lock);
 405                 vstate = &state->dts_vstate;
 406
 407                 if (state->dts_activity != DTRACE_ACTIVITY_INACTIVE) {
 408                         mutex_exit(&dtrace_lock);
 409                         mutex_exit(&cpu_lock);
 410                         dtrace_dof_destroy(dof);
 411                         return (EBUSY);
 412                 }
 413
 414                 if (dtrace_dof_slurp(dof, vstate, td->td_ucred, &enab, 0, B_TRUE) != 0) {
 415                         mutex_exit(&dtrace_lock);
 416                         mutex_exit(&cpu_lock);
 417                         dtrace_dof_destroy(dof);
 418                         return (EINVAL);
 419                 }
 420
 421                 if ((rval = dtrace_dof_options(dof, state)) != 0) {
 422                         dtrace_enabling_destroy(enab);
 423                         mutex_exit(&dtrace_lock);
 424                         mutex_exit(&cpu_lock);
 425                         dtrace_dof_destroy(dof);
 426                         return (rval);
 427                 }
 428
 429                 if ((err = dtrace_enabling_match(enab, &p->n_matched)) == 0) {
 430                         err = dtrace_enabling_retain(enab);
 431                 } else {
 432                         dtrace_enabling_destroy(enab);
 433                 }
 434
 435                 mutex_exit(&cpu_lock);
 436                 mutex_exit(&dtrace_lock);
 437                 dtrace_dof_destroy(dof);
 438
 439                 return (err);
 440         }
 441         case DTRACEIOC_EPROBE: {
 442                 dtrace_eprobedesc_t **pepdesc = (dtrace_eprobedesc_t **) addr;
 443                 dtrace_eprobedesc_t epdesc;
 444                 dtrace_ecb_t *ecb;
 445                 dtrace_action_t *act;
 446                 void *buf;
 447                 size_t size;
 448                 uintptr_t dest;
 449                 int nrecs;
 450
 451                 DTRACE_IOCTL_PRINTF("%s(%d): DTRACEIOC_EPROBE\n",__func__,__LINE__);
 452
 453                 if (copyin((void *)*pepdesc, &epdesc, sizeof (epdesc)) != 0)
 454                         return (EFAULT);
 455
 456                 mutex_enter(&dtrace_lock);
 457
 458                 if ((ecb = dtrace_epid2ecb(state, epdesc.dtepd_epid)) == NULL) {
 459                         mutex_exit(&dtrace_lock);
 460                         return (EINVAL);
 461                 }
 462
 463                 if (ecb->dte_probe == NULL) {
 464                         mutex_exit(&dtrace_lock);
 465                         return (EINVAL);
 466                 }
 467
 468                 epdesc.dtepd_probeid = ecb->dte_probe->dtpr_id;
 469                 epdesc.dtepd_uarg = ecb->dte_uarg;
 470                 epdesc.dtepd_size = ecb->dte_size;
 471
 472                 nrecs = epdesc.dtepd_nrecs;
 473                 epdesc.dtepd_nrecs = 0;
 474                 for (act = ecb->dte_action; act != NULL; act = act->dta_next) {
 475                         if (DTRACEACT_ISAGG(act->dta_kind) || act->dta_intuple)
 476                                 continue;
 477
 478                         epdesc.dtepd_nrecs++;
 479                 }
 480
 481                 /*
 482                  * Now that we have the size, we need to allocate a temporary
 483                  * buffer in which to store the complete description.  We need
 484                  * the temporary buffer to be able to drop dtrace_lock()
 485                  * across the copyout(), below.
 486                  */
 487                 size = sizeof (dtrace_eprobedesc_t) +
 488                     (epdesc.dtepd_nrecs * sizeof (dtrace_recdesc_t));
 489
 490                 buf = kmem_alloc(size, KM_SLEEP);
 491                 dest = (uintptr_t)buf;
 492
 493                 bcopy(&epdesc, (void *)dest, sizeof (epdesc));
 494                 dest += offsetof(dtrace_eprobedesc_t, dtepd_rec[0]);
 495
 496                 for (act = ecb->dte_action; act != NULL; act = act->dta_next) {
 497                         if (DTRACEACT_ISAGG(act->dta_kind) || act->dta_intuple)
 498                                 continue;
 499
 500                         if (nrecs-- == 0)
 501                                 break;
 502
 503                         bcopy(&act->dta_rec, (void *)dest,
 504                             sizeof (dtrace_recdesc_t));
 505                         dest += sizeof (dtrace_recdesc_t);
 506                 }
 507
 508                 mutex_exit(&dtrace_lock);
 509
 510                 if (copyout(buf, (void *) *pepdesc, dest - (uintptr_t)buf) != 0) {
 511                         kmem_free(buf, size);
 512                         return (EFAULT);
 513                 }
 514
 515                 kmem_free(buf, size);
 516                 return (0);
 517         }
 518         case DTRACEIOC_FORMAT: {
 519                 dtrace_fmtdesc_t *fmt = (dtrace_fmtdesc_t *) addr;
 520                 char *str;
 521                 int len;
 522
 523                 DTRACE_IOCTL_PRINTF("%s(%d): DTRACEIOC_FORMAT\n",__func__,__LINE__);
 524
 525                 mutex_enter(&dtrace_lock);
 526
 527                 if (fmt->dtfd_format == 0 ||
 528                     fmt->dtfd_format > state->dts_nformats) {
 529                         mutex_exit(&dtrace_lock);
 530                         return (EINVAL);
 531                 }
 532
 533                 /*
 534                  * Format strings are allocated contiguously and they are
 535                  * never freed; if a format index is less than the number
 536                  * of formats, we can assert that the format map is non-NULL
 537                  * and that the format for the specified index is non-NULL.
 538                  */
 539                 ASSERT(state->dts_formats != NULL);
 540                 str = state->dts_formats[fmt->dtfd_format - 1];
 541                 ASSERT(str != NULL);
 542
 543                 len = strlen(str) + 1;
 544
 545                 if (len > fmt->dtfd_length) {
 546                         fmt->dtfd_length = len;
 547                 } else {
 548                         if (copyout(str, fmt->dtfd_string, len) != 0) {
 549                                 mutex_exit(&dtrace_lock);
 550                                 return (EINVAL);
 551                         }
 552                 }
 553
 554                 mutex_exit(&dtrace_lock);
 555                 return (0);
 556         }
 557         case DTRACEIOC_GO: {
 558                 int rval;
 559                 processorid_t *cpuid = (processorid_t *) addr;
 560
 561                 DTRACE_IOCTL_PRINTF("%s(%d): DTRACEIOC_GO\n",__func__,__LINE__);
 562
 563                 rval = dtrace_state_go(state, cpuid);
 564
 565                 return (rval);
 566         }
 567         case DTRACEIOC_PROBEARG: {
 568                 dtrace_argdesc_t *desc = (dtrace_argdesc_t *) addr;
 569                 dtrace_probe_t *probe;
 570                 dtrace_provider_t *prov;
 571
 572                 DTRACE_IOCTL_PRINTF("%s(%d): DTRACEIOC_PROBEARG\n",__func__,__LINE__);
 573
 574                 if (desc->dtargd_id == DTRACE_IDNONE)
 575                         return (EINVAL);
 576
 577                 if (desc->dtargd_ndx == DTRACE_ARGNONE)
 578                         return (EINVAL);
 579
 580                 mutex_enter(&dtrace_provider_lock);
 581 #if defined(sun)
 582                 mutex_enter(&mod_lock);
 583 #endif
 584                 mutex_enter(&dtrace_lock);
 585
 586                 if (desc->dtargd_id > dtrace_nprobes) {
 587                         mutex_exit(&dtrace_lock);
 588 #if defined(sun)
 589                         mutex_exit(&mod_lock);
 590 #endif
 591                         mutex_exit(&dtrace_provider_lock);
 592                         return (EINVAL);
 593                 }
 594
 595                 if ((probe = dtrace_probes[desc->dtargd_id - 1]) == NULL) {
 596                         mutex_exit(&dtrace_lock);
 597 #if defined(sun)
 598                         mutex_exit(&mod_lock);
 599 #endif
 600                         mutex_exit(&dtrace_provider_lock);
 601                         return (EINVAL);
 602                 }
 603
 604                 mutex_exit(&dtrace_lock);
 605
 606                 prov = probe->dtpr_provider;
 607
 608                 if (prov->dtpv_pops.dtps_getargdesc == NULL) {
 609                         /*
 610                          * There isn't any typed information for this probe.
 611                          * Set the argument number to DTRACE_ARGNONE.
 612                          */
 613                         desc->dtargd_ndx = DTRACE_ARGNONE;
 614                 } else {
 615                         desc->dtargd_native[0] = '\0';
 616                         desc->dtargd_xlate[0] = '\0';
 617                         desc->dtargd_mapping = desc->dtargd_ndx;
 618
 619                         prov->dtpv_pops.dtps_getargdesc(prov->dtpv_arg,
 620                             probe->dtpr_id, probe->dtpr_arg, desc);
 621                 }
 622
 623 #if defined(sun)
 624                 mutex_exit(&mod_lock);
 625 #endif
 626                 mutex_exit(&dtrace_provider_lock);
 627
 628                 return (0);
 629         }
 630         case DTRACEIOC_PROBEMATCH:
 631         case DTRACEIOC_PROBES: {
 632                 dtrace_probedesc_t *p_desc = (dtrace_probedesc_t *) addr;
 633                 dtrace_probe_t *probe = NULL;
 634                 dtrace_probekey_t pkey;
 635                 dtrace_id_t i;
 636                 int m = 0;
 637                 uint32_t priv = 0;
 638                 uid_t uid = 0;
 639                 zoneid_t zoneid = 0;
 640
 641                 DTRACE_IOCTL_PRINTF("%s(%d): %s\n",__func__,__LINE__,
 642                     cmd == DTRACEIOC_PROBEMATCH ?
 643                     "DTRACEIOC_PROBEMATCH":"DTRACEIOC_PROBES");
 644
 645                 p_desc->dtpd_provider[DTRACE_PROVNAMELEN - 1] = '\0';
 646                 p_desc->dtpd_mod[DTRACE_MODNAMELEN - 1] = '\0';
 647                 p_desc->dtpd_func[DTRACE_FUNCNAMELEN - 1] = '\0';
 648                 p_desc->dtpd_name[DTRACE_NAMELEN - 1] = '\0';
 649
 650                 /*
 651                  * Before we attempt to match this probe, we want to give
 652                  * all providers the opportunity to provide it.
 653                  */
 654                 if (p_desc->dtpd_id == DTRACE_IDNONE) {
 655                         mutex_enter(&dtrace_provider_lock);
 656                         dtrace_probe_provide(p_desc, NULL);
 657                         mutex_exit(&dtrace_provider_lock);
 658                         p_desc->dtpd_id++;
 659                 }
 660
 661                 if (cmd == DTRACEIOC_PROBEMATCH)  {
 662                         dtrace_probekey(p_desc, &pkey);
 663                         pkey.dtpk_id = DTRACE_IDNONE;
 664                 }
 665
 666                 dtrace_cred2priv(td->td_ucred, &priv, &uid, &zoneid);
 667
 668                 mutex_enter(&dtrace_lock);
 669
 670                 if (cmd == DTRACEIOC_PROBEMATCH) {
 671                         for (i = p_desc->dtpd_id; i <= dtrace_nprobes; i++) {
 672                                 if ((probe = dtrace_probes[i - 1]) != NULL &&
 673                                     (m = dtrace_match_probe(probe, &pkey,
 674                                     priv, uid, zoneid)) != 0)
 675                                         break;
 676                         }
 677
 678                         if (m < 0) {
 679                                 mutex_exit(&dtrace_lock);
 680                                 return (EINVAL);
 681                         }
 682
 683                 } else {
 684                         for (i = p_desc->dtpd_id; i <= dtrace_nprobes; i++) {
 685                                 if ((probe = dtrace_probes[i - 1]) != NULL &&
 686                                     dtrace_match_priv(probe, priv, uid, zoneid))
 687                                         break;
 688                         }
 689                 }
 690
 691                 if (probe == NULL) {
 692                         mutex_exit(&dtrace_lock);
 693                         return (ESRCH);
 694                 }
 695
 696                 dtrace_probe_description(probe, p_desc);
 697                 mutex_exit(&dtrace_lock);
 698
 699                 return (0);
 700         }
 701         case DTRACEIOC_PROVIDER: {
 702                 dtrace_providerdesc_t *pvd = (dtrace_providerdesc_t *) addr;
 703                 dtrace_provider_t *pvp;
 704
 705                 DTRACE_IOCTL_PRINTF("%s(%d): DTRACEIOC_PROVIDER\n",__func__,__LINE__);
 706
 707                 pvd->dtvd_name[DTRACE_PROVNAMELEN - 1] = '\0';
 708                 mutex_enter(&dtrace_provider_lock);
 709
 710                 for (pvp = dtrace_provider; pvp != NULL; pvp = pvp->dtpv_next) {
 711                         if (strcmp(pvp->dtpv_name, pvd->dtvd_name) == 0)
 712                                 break;
 713                 }
 714
 715                 mutex_exit(&dtrace_provider_lock);
 716
 717                 if (pvp == NULL)
 718                         return (ESRCH);
 719
 720                 bcopy(&pvp->dtpv_priv, &pvd->dtvd_priv, sizeof (dtrace_ppriv_t));
 721                 bcopy(&pvp->dtpv_attr, &pvd->dtvd_attr, sizeof (dtrace_pattr_t));
 722
 723                 return (0);
 724         }
 725         case DTRACEIOC_REPLICATE: {
 726                 dtrace_repldesc_t *desc = (dtrace_repldesc_t *) addr;
 727                 dtrace_probedesc_t *match = &desc->dtrpd_match;
 728                 dtrace_probedesc_t *create = &desc->dtrpd_create;
 729                 int err;
 730
 731                 DTRACE_IOCTL_PRINTF("%s(%d): DTRACEIOC_REPLICATE\n",__func__,__LINE__);
 732
 733                 match->dtpd_provider[DTRACE_PROVNAMELEN - 1] = '\0';
 734                 match->dtpd_mod[DTRACE_MODNAMELEN - 1] = '\0';
 735                 match->dtpd_func[DTRACE_FUNCNAMELEN - 1] = '\0';
 736                 match->dtpd_name[DTRACE_NAMELEN - 1] = '\0';
 737
 738                 create->dtpd_provider[DTRACE_PROVNAMELEN - 1] = '\0';
 739                 create->dtpd_mod[DTRACE_MODNAMELEN - 1] = '\0';
 740                 create->dtpd_func[DTRACE_FUNCNAMELEN - 1] = '\0';
 741                 create->dtpd_name[DTRACE_NAMELEN - 1] = '\0';
 742
 743                 mutex_enter(&dtrace_lock);
 744                 err = dtrace_enabling_replicate(state, match, create);
 745                 mutex_exit(&dtrace_lock);
 746
 747                 return (err);
 748         }
 749         case DTRACEIOC_STATUS: {
 750                 dtrace_status_t *stat = (dtrace_status_t *) addr;
 751                 dtrace_dstate_t *dstate;
 752                 int i, j;
 753                 uint64_t nerrs;
 754
 755                 DTRACE_IOCTL_PRINTF("%s(%d): DTRACEIOC_STATUS\n",__func__,__LINE__);
 756
 757                 /*
 758                  * See the comment in dtrace_state_deadman() for the reason
 759                  * for setting dts_laststatus to INT64_MAX before setting
 760                  * it to the correct value.
 761                  */
 762                 state->dts_laststatus = INT64_MAX;
 763                 dtrace_membar_producer();
 764                 state->dts_laststatus = dtrace_gethrtime();
 765
 766                 bzero(stat, sizeof (*stat));
 767
 768                 mutex_enter(&dtrace_lock);
 769
 770                 if (state->dts_activity == DTRACE_ACTIVITY_INACTIVE) {
 771                         mutex_exit(&dtrace_lock);
 772                         return (ENOENT);
 773                 }
 774
 775                 if (state->dts_activity == DTRACE_ACTIVITY_DRAINING)
 776                         stat->dtst_exiting = 1;
 777
 778                 nerrs = state->dts_errors;
 779                 dstate = &state->dts_vstate.dtvs_dynvars;
 780
 781                 for (i = 0; i < NCPU; i++) {
 782 #if !defined(sun)
 783                         if (pcpu_find(i) == NULL)
 784                                 continue;
 785 #endif
 786                         dtrace_dstate_percpu_t *dcpu = &dstate->dtds_percpu[i];
 787
 788                         stat->dtst_dyndrops += dcpu->dtdsc_drops;
 789                         stat->dtst_dyndrops_dirty += dcpu->dtdsc_dirty_drops;
 790                         stat->dtst_dyndrops_rinsing += dcpu->dtdsc_rinsing_drops;
 791
 792                         if (state->dts_buffer[i].dtb_flags & DTRACEBUF_FULL)
 793                                 stat->dtst_filled++;
 794
 795                         nerrs += state->dts_buffer[i].dtb_errors;
 796
 797                         for (j = 0; j < state->dts_nspeculations; j++) {
 798                                 dtrace_speculation_t *spec;
 799                                 dtrace_buffer_t *buf;
 800
 801                                 spec = &state->dts_speculations[j];
 802                                 buf = &spec->dtsp_buffer[i];
 803                                 stat->dtst_specdrops += buf->dtb_xamot_drops;
 804                         }
 805                 }
 806
 807                 stat->dtst_specdrops_busy = state->dts_speculations_busy;
 808                 stat->dtst_specdrops_unavail = state->dts_speculations_unavail;
 809                 stat->dtst_stkstroverflows = state->dts_stkstroverflows;
 810                 stat->dtst_dblerrors = state->dts_dblerrors;
 811                 stat->dtst_killed =
 812                     (state->dts_activity == DTRACE_ACTIVITY_KILLED);
 813                 stat->dtst_errors = nerrs;
 814
 815                 mutex_exit(&dtrace_lock);
 816
 817                 return (0);
 818         }
 819         case DTRACEIOC_STOP: {
 820                 int rval;
 821                 processorid_t *cpuid = (processorid_t *) addr;
 822
 823                 DTRACE_IOCTL_PRINTF("%s(%d): DTRACEIOC_STOP\n",__func__,__LINE__);
 824
 825                 mutex_enter(&dtrace_lock);
 826                 rval = dtrace_state_stop(state, cpuid);
 827                 mutex_exit(&dtrace_lock);
 828
 829                 return (rval);
 830         }
 831         default:
 832                 error = ENOTTY;
 833         }
 834         return (error);
 835 }