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, &dtrace_verbose_ioctl, 0, "");
  27
  28 #define DTRACE_IOCTL_PRINTF(fmt, ...)   if (dtrace_verbose_ioctl) printf(fmt, ## __VA_ARGS__ )
  29
  30 /* ARGSUSED */
  31 static int
  32 dtrace_ioctl(struct cdev *dev, u_long cmd, caddr_t addr,
  33     int flags __unused, struct thread *td)
  34 {
  35         dtrace_state_t *state = dev->si_drv1;
  36         int error = 0;
  37         if (state == NULL)
  38                 return (EINVAL);
  39
  40         if (state->dts_anon) {
  41                 ASSERT(dtrace_anon.dta_state == NULL);
  42                 state = state->dts_anon;
  43         }
  44
  45         switch (cmd) {
  46         case DTRACEIOC_AGGDESC: {
  47                 dtrace_aggdesc_t **paggdesc = (dtrace_aggdesc_t **) addr;
  48                 dtrace_aggdesc_t aggdesc;
  49                 dtrace_action_t *act;
  50                 dtrace_aggregation_t *agg;
  51                 int nrecs;
  52                 uint32_t offs;
  53                 dtrace_recdesc_t *lrec;
  54                 void *buf;
  55                 size_t size;
  56                 uintptr_t dest;
  57
  58                 DTRACE_IOCTL_PRINTF("%s(%d): DTRACEIOC_AGGDESC\n",__func__,__LINE__);
  59
  60                 if (copyin((void *) *paggdesc, &aggdesc, sizeof (aggdesc)) != 0)
  61                         return (EFAULT);
  62
  63                 mutex_enter(&dtrace_lock);
  64
  65                 if ((agg = dtrace_aggid2agg(state, aggdesc.dtagd_id)) == NULL) {
  66                         mutex_exit(&dtrace_lock);
  67                         return (EINVAL);
  68                 }
  69
  70                 aggdesc.dtagd_epid = agg->dtag_ecb->dte_epid;
  71
  72                 nrecs = aggdesc.dtagd_nrecs;
  73                 aggdesc.dtagd_nrecs = 0;
  74
  75                 offs = agg->dtag_base;
  76                 lrec = &agg->dtag_action.dta_rec;
  77                 aggdesc.dtagd_size = lrec->dtrd_offset + lrec->dtrd_size - offs;
  78
  79                 for (act = agg->dtag_first; ; act = act->dta_next) {
  80                         ASSERT(act->dta_intuple ||
  81                             DTRACEACT_ISAGG(act->dta_kind));
  82
  83                         /*
  84                          * If this action has a record size of zero, it
  85                          * denotes an argument to the aggregating action.
  86                          * Because the presence of this record doesn't (or
  87                          * shouldn't) affect the way the data is interpreted,
  88                          * we don't copy it out to save user-level the
  89                          * confusion of dealing with a zero-length record.
  90                          */
  91                         if (act->dta_rec.dtrd_size == 0) {
  92                                 ASSERT(agg->dtag_hasarg);
  93                                 continue;
  94                         }
  95
  96                         aggdesc.dtagd_nrecs++;
  97
  98                         if (act == &agg->dtag_action)
  99                                 break;
 100                 }
 101
 102                 /*
 103                  * Now that we have the size, we need to allocate a temporary
 104                  * buffer in which to store the complete description.  We need
 105                  * the temporary buffer to be able to drop dtrace_lock()
 106                  * across the copyout(), below.
 107                  */
 108                 size = sizeof (dtrace_aggdesc_t) +
 109                     (aggdesc.dtagd_nrecs * sizeof (dtrace_recdesc_t));
 110
 111                 buf = kmem_alloc(size, KM_SLEEP);
 112                 dest = (uintptr_t)buf;
 113
 114                 bcopy(&aggdesc, (void *)dest, sizeof (aggdesc));
 115                 dest += offsetof(dtrace_aggdesc_t, dtagd_rec[0]);
 116
 117                 for (act = agg->dtag_first; ; act = act->dta_next) {
 118                         dtrace_recdesc_t rec = act->dta_rec;
 119
 120                         /*
 121                          * See the comment in the above loop for why we pass
 122                          * over zero-length records.
 123                          */
 124                         if (rec.dtrd_size == 0) {
 125                                 ASSERT(agg->dtag_hasarg);
 126                                 continue;
 127                         }
 128
 129                         if (nrecs-- == 0)
 130                                 break;
 131
 132                         rec.dtrd_offset -= offs;
 133                         bcopy(&rec, (void *)dest, sizeof (rec));
 134                         dest += sizeof (dtrace_recdesc_t);
 135
 136                         if (act == &agg->dtag_action)
 137                                 break;
 138                 }
 139
 140                 mutex_exit(&dtrace_lock);
 141
 142                 if (copyout(buf, (void *) *paggdesc, dest - (uintptr_t)buf) != 0) {
 143                         kmem_free(buf, size);
 144                         return (EFAULT);
 145                 }
 146
 147                 kmem_free(buf, size);
 148                 return (0);
 149         }
 150         case DTRACEIOC_AGGSNAP:
 151         case DTRACEIOC_BUFSNAP: {
 152                 dtrace_bufdesc_t **pdesc = (dtrace_bufdesc_t **) addr;
 153                 dtrace_bufdesc_t desc;
 154                 caddr_t cached;
 155                 dtrace_buffer_t *buf;
 156
 157                 dtrace_debug_output();
 158
 159                 if (copyin((void *) *pdesc, &desc, sizeof (desc)) != 0)
 160                         return (EFAULT);
 161
 162                 DTRACE_IOCTL_PRINTF("%s(%d): %s curcpu %d cpu %d\n",
 163                     __func__,__LINE__,
 164                     cmd == DTRACEIOC_AGGSNAP ?
 165                     "DTRACEIOC_AGGSNAP":"DTRACEIOC_BUFSNAP",
 166                     curcpu, desc.dtbd_cpu);
 167
 168                 if (desc.dtbd_cpu < 0 || desc.dtbd_cpu >= NCPU)
 169                         return (ENOENT);
 170                 if (pcpu_find(desc.dtbd_cpu) == NULL)
 171                         return (ENOENT);
 172
 173                 mutex_enter(&dtrace_lock);
 174
 175                 if (cmd == DTRACEIOC_BUFSNAP) {
 176                         buf = &state->dts_buffer[desc.dtbd_cpu];
 177                 } else {
 178                         buf = &state->dts_aggbuffer[desc.dtbd_cpu];
 179                 }
 180
 181                 if (buf->dtb_flags & (DTRACEBUF_RING | DTRACEBUF_FILL)) {
 182                         size_t sz = buf->dtb_offset;
 183
 184                         if (state->dts_activity != DTRACE_ACTIVITY_STOPPED) {
 185                                 mutex_exit(&dtrace_lock);
 186                                 return (EBUSY);
 187                         }
 188
 189                         /*
 190                          * If this buffer has already been consumed, we're
 191                          * going to indicate that there's nothing left here
 192                          * to consume.
 193                          */
 194                         if (buf->dtb_flags & DTRACEBUF_CONSUMED) {
 195                                 mutex_exit(&dtrace_lock);
 196
 197                                 desc.dtbd_size = 0;
 198                                 desc.dtbd_drops = 0;
 199                                 desc.dtbd_errors = 0;
 200                                 desc.dtbd_oldest = 0;
 201                                 sz = sizeof (desc);
 202
 203                                 if (copyout(&desc, (void *) *pdesc, sz) != 0)
 204                                         return (EFAULT);
 205
 206                                 return (0);
 207                         }
 208
 209                         /*
 210                          * If this is a ring buffer that has wrapped, we want
 211                          * to copy the whole thing out.
 212                          */
 213                         if (buf->dtb_flags & DTRACEBUF_WRAPPED) {
 214                                 dtrace_buffer_polish(buf);
 215                                 sz = buf->dtb_size;
 216                         }
 217
 218                         if (copyout(buf->dtb_tomax, desc.dtbd_data, sz) != 0) {
 219                                 mutex_exit(&dtrace_lock);
 220                                 return (EFAULT);
 221                         }
 222
 223                         desc.dtbd_size = sz;
 224                         desc.dtbd_drops = buf->dtb_drops;
 225                         desc.dtbd_errors = buf->dtb_errors;
 226                         desc.dtbd_oldest = buf->dtb_xamot_offset;
 227
 228                         mutex_exit(&dtrace_lock);
 229
 230                         if (copyout(&desc, (void *) *pdesc, sizeof (desc)) != 0)
 231                                 return (EFAULT);
 232
 233                         buf->dtb_flags |= DTRACEBUF_CONSUMED;
 234
 235                         return (0);
 236                 }
 237
 238                 if (buf->dtb_tomax == NULL) {
 239                         ASSERT(buf->dtb_xamot == NULL);
 240                         mutex_exit(&dtrace_lock);
 241                         return (ENOENT);
 242                 }
 243
 244                 cached = buf->dtb_tomax;
 245                 ASSERT(!(buf->dtb_flags & DTRACEBUF_NOSWITCH));
 246
 247                 dtrace_xcall(desc.dtbd_cpu,
 248                     (dtrace_xcall_t)dtrace_buffer_switch, buf);
 249
 250                 state->dts_errors += buf->dtb_xamot_errors;
 251
 252                 /*
 253                  * If the buffers did not actually switch, then the cross call
 254                  * did not take place -- presumably because the given CPU is
 255                  * not in the ready set.  If this is the case, we'll return
 256                  * ENOENT.
 257                  */
 258                 if (buf->dtb_tomax == cached) {
 259                         ASSERT(buf->dtb_xamot != cached);
 260                         mutex_exit(&dtrace_lock);
 261                         return (ENOENT);
 262                 }
 263
 264                 ASSERT(cached == buf->dtb_xamot);
 265
 266                 DTRACE_IOCTL_PRINTF("%s(%d): copyout the buffer snapshot\n",__func__,__LINE__);
 267
 268                 /*
 269                  * We have our snapshot; now copy it out.
 270                  */
 271                 if (copyout(buf->dtb_xamot, desc.dtbd_data,
 272                     buf->dtb_xamot_offset) != 0) {
 273                         mutex_exit(&dtrace_lock);
 274                         return (EFAULT);
 275                 }
 276
 277                 desc.dtbd_size = buf->dtb_xamot_offset;
 278                 desc.dtbd_drops = buf->dtb_xamot_drops;
 279                 desc.dtbd_errors = buf->dtb_xamot_errors;
 280                 desc.dtbd_oldest = 0;
 281
 282                 mutex_exit(&dtrace_lock);
 283
 284                 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);
 285
 286                 /*
 287                  * Finally, copy out the buffer description.
 288                  */
 289                 if (copyout(&desc, (void *) *pdesc, sizeof (desc)) != 0)
 290                         return (EFAULT);
 291
 292                 return (0);
 293         }
 294         case DTRACEIOC_CONF: {
 295                 dtrace_conf_t conf;
 296
 297                 DTRACE_IOCTL_PRINTF("%s(%d): DTRACEIOC_CONF\n",__func__,__LINE__);
 298
 299                 bzero(&conf, sizeof (conf));
 300                 conf.dtc_difversion = DIF_VERSION;
 301                 conf.dtc_difintregs = DIF_DIR_NREGS;
 302                 conf.dtc_diftupregs = DIF_DTR_NREGS;
 303                 conf.dtc_ctfmodel = CTF_MODEL_NATIVE;
 304
 305                 *((dtrace_conf_t *) addr) = conf;
 306
 307                 return (0);
 308         }
 309         case DTRACEIOC_DOFGET: {
 310                 dof_hdr_t **pdof = (dof_hdr_t **) addr;
 311                 dof_hdr_t hdr, *dof = *pdof;
 312                 int rval;
 313                 uint64_t len;
 314
 315                 DTRACE_IOCTL_PRINTF("%s(%d): DTRACEIOC_DOFGET\n",__func__,__LINE__);
 316
 317                 if (copyin((void *)dof, &hdr, sizeof (hdr)) != 0)
 318                         return (EFAULT);
 319
 320                 mutex_enter(&dtrace_lock);
 321                 dof = dtrace_dof_create(state);
 322                 mutex_exit(&dtrace_lock);
 323
 324                 len = MIN(hdr.dofh_loadsz, dof->dofh_loadsz);
 325                 rval = copyout(dof, (void *) *pdof, len);
 326                 dtrace_dof_destroy(dof);
 327
 328                 return (rval == 0 ? 0 : EFAULT);
 329         }
 330         case DTRACEIOC_ENABLE: {
 331                 dof_hdr_t *dof = NULL;
 332                 dtrace_enabling_t *enab = NULL;
 333                 dtrace_vstate_t *vstate;
 334                 int err = 0;
 335                 int rval;
 336                 dtrace_enable_io_t *p = (dtrace_enable_io_t *) addr;
 337
 338                 DTRACE_IOCTL_PRINTF("%s(%d): DTRACEIOC_ENABLE\n",__func__,__LINE__);
 339
 340                 /*
 341                  * If a NULL argument has been passed, we take this as our
 342                  * cue to reevaluate our enablings.
 343                  */
 344                 if (p->dof == NULL) {
 345                         dtrace_enabling_matchall();
 346
 347                         return (0);
 348                 }
 349
 350                 if ((dof = dtrace_dof_copyin((uintptr_t) p->dof, &rval)) == NULL)
 351                         return (EINVAL);
 352
 353                 mutex_enter(&cpu_lock);
 354                 mutex_enter(&dtrace_lock);
 355                 vstate = &state->dts_vstate;
 356
 357                 if (state->dts_activity != DTRACE_ACTIVITY_INACTIVE) {
 358                         mutex_exit(&dtrace_lock);
 359                         mutex_exit(&cpu_lock);
 360                         dtrace_dof_destroy(dof);
 361                         return (EBUSY);
 362                 }
 363
 364                 if (dtrace_dof_slurp(dof, vstate, td->td_ucred, &enab, 0, B_TRUE) != 0) {
 365                         mutex_exit(&dtrace_lock);
 366                         mutex_exit(&cpu_lock);
 367                         dtrace_dof_destroy(dof);
 368                         return (EINVAL);
 369                 }
 370
 371                 if ((rval = dtrace_dof_options(dof, state)) != 0) {
 372                         dtrace_enabling_destroy(enab);
 373                         mutex_exit(&dtrace_lock);
 374                         mutex_exit(&cpu_lock);
 375                         dtrace_dof_destroy(dof);
 376                         return (rval);
 377                 }
 378
 379                 if ((err = dtrace_enabling_match(enab, &p->n_matched)) == 0) {
 380                         err = dtrace_enabling_retain(enab);
 381                 } else {
 382                         dtrace_enabling_destroy(enab);
 383                 }
 384
 385                 mutex_exit(&cpu_lock);
 386                 mutex_exit(&dtrace_lock);
 387                 dtrace_dof_destroy(dof);
 388
 389                 return (err);
 390         }
 391         case DTRACEIOC_EPROBE: {
 392                 dtrace_eprobedesc_t **pepdesc = (dtrace_eprobedesc_t **) addr;
 393                 dtrace_eprobedesc_t epdesc;
 394                 dtrace_ecb_t *ecb;
 395                 dtrace_action_t *act;
 396                 void *buf;
 397                 size_t size;
 398                 uintptr_t dest;
 399                 int nrecs;
 400
 401                 DTRACE_IOCTL_PRINTF("%s(%d): DTRACEIOC_EPROBE\n",__func__,__LINE__);
 402
 403                 if (copyin((void *)*pepdesc, &epdesc, sizeof (epdesc)) != 0)
 404                         return (EFAULT);
 405
 406                 mutex_enter(&dtrace_lock);
 407
 408                 if ((ecb = dtrace_epid2ecb(state, epdesc.dtepd_epid)) == NULL) {
 409                         mutex_exit(&dtrace_lock);
 410                         return (EINVAL);
 411                 }
 412
 413                 if (ecb->dte_probe == NULL) {
 414                         mutex_exit(&dtrace_lock);
 415                         return (EINVAL);
 416                 }
 417
 418                 epdesc.dtepd_probeid = ecb->dte_probe->dtpr_id;
 419                 epdesc.dtepd_uarg = ecb->dte_uarg;
 420                 epdesc.dtepd_size = ecb->dte_size;
 421
 422                 nrecs = epdesc.dtepd_nrecs;
 423                 epdesc.dtepd_nrecs = 0;
 424                 for (act = ecb->dte_action; act != NULL; act = act->dta_next) {
 425                         if (DTRACEACT_ISAGG(act->dta_kind) || act->dta_intuple)
 426                                 continue;
 427
 428                         epdesc.dtepd_nrecs++;
 429                 }
 430
 431                 /*
 432                  * Now that we have the size, we need to allocate a temporary
 433                  * buffer in which to store the complete description.  We need
 434                  * the temporary buffer to be able to drop dtrace_lock()
 435                  * across the copyout(), below.
 436                  */
 437                 size = sizeof (dtrace_eprobedesc_t) +
 438                     (epdesc.dtepd_nrecs * sizeof (dtrace_recdesc_t));
 439
 440                 buf = kmem_alloc(size, KM_SLEEP);
 441                 dest = (uintptr_t)buf;
 442
 443                 bcopy(&epdesc, (void *)dest, sizeof (epdesc));
 444                 dest += offsetof(dtrace_eprobedesc_t, dtepd_rec[0]);
 445
 446                 for (act = ecb->dte_action; act != NULL; act = act->dta_next) {
 447                         if (DTRACEACT_ISAGG(act->dta_kind) || act->dta_intuple)
 448                                 continue;
 449
 450                         if (nrecs-- == 0)
 451                                 break;
 452
 453                         bcopy(&act->dta_rec, (void *)dest,
 454                             sizeof (dtrace_recdesc_t));
 455                         dest += sizeof (dtrace_recdesc_t);
 456                 }
 457
 458                 mutex_exit(&dtrace_lock);
 459
 460                 if (copyout(buf, (void *) *pepdesc, dest - (uintptr_t)buf) != 0) {
 461                         kmem_free(buf, size);
 462                         return (EFAULT);
 463                 }
 464
 465                 kmem_free(buf, size);
 466                 return (0);
 467         }
 468         case DTRACEIOC_FORMAT: {
 469                 dtrace_fmtdesc_t *fmt = (dtrace_fmtdesc_t *) addr;
 470                 char *str;
 471                 int len;
 472
 473                 DTRACE_IOCTL_PRINTF("%s(%d): DTRACEIOC_FORMAT\n",__func__,__LINE__);
 474
 475                 mutex_enter(&dtrace_lock);
 476
 477                 if (fmt->dtfd_format == 0 ||
 478                     fmt->dtfd_format > state->dts_nformats) {
 479                         mutex_exit(&dtrace_lock);
 480                         return (EINVAL);
 481                 }
 482
 483                 /*
 484                  * Format strings are allocated contiguously and they are
 485                  * never freed; if a format index is less than the number
 486                  * of formats, we can assert that the format map is non-NULL
 487                  * and that the format for the specified index is non-NULL.
 488                  */
 489                 ASSERT(state->dts_formats != NULL);
 490                 str = state->dts_formats[fmt->dtfd_format - 1];
 491                 ASSERT(str != NULL);
 492
 493                 len = strlen(str) + 1;
 494
 495                 if (len > fmt->dtfd_length) {
 496                         fmt->dtfd_length = len;
 497                 } else {
 498                         if (copyout(str, fmt->dtfd_string, len) != 0) {
 499                                 mutex_exit(&dtrace_lock);
 500                                 return (EINVAL);
 501                         }
 502                 }
 503
 504                 mutex_exit(&dtrace_lock);
 505                 return (0);
 506         }
 507         case DTRACEIOC_GO: {
 508                 int rval;
 509                 processorid_t *cpuid = (processorid_t *) addr;
 510
 511                 DTRACE_IOCTL_PRINTF("%s(%d): DTRACEIOC_GO\n",__func__,__LINE__);
 512
 513                 rval = dtrace_state_go(state, cpuid);
 514
 515                 return (rval);
 516         }
 517         case DTRACEIOC_PROBEARG: {
 518                 dtrace_argdesc_t *desc = (dtrace_argdesc_t *) addr;
 519                 dtrace_probe_t *probe;
 520                 dtrace_provider_t *prov;
 521
 522                 DTRACE_IOCTL_PRINTF("%s(%d): DTRACEIOC_PROBEARG\n",__func__,__LINE__);
 523
 524                 if (desc->dtargd_id == DTRACE_IDNONE)
 525                         return (EINVAL);
 526
 527                 if (desc->dtargd_ndx == DTRACE_ARGNONE)
 528                         return (EINVAL);
 529
 530                 mutex_enter(&dtrace_provider_lock);
 531                 mutex_enter(&mod_lock);
 532                 mutex_enter(&dtrace_lock);
 533
 534                 if (desc->dtargd_id > dtrace_nprobes) {
 535                         mutex_exit(&dtrace_lock);
 536                         mutex_exit(&mod_lock);
 537                         mutex_exit(&dtrace_provider_lock);
 538                         return (EINVAL);
 539                 }
 540
 541                 if ((probe = dtrace_probes[desc->dtargd_id - 1]) == NULL) {
 542                         mutex_exit(&dtrace_lock);
 543                         mutex_exit(&mod_lock);
 544                         mutex_exit(&dtrace_provider_lock);
 545                         return (EINVAL);
 546                 }
 547
 548                 mutex_exit(&dtrace_lock);
 549
 550                 prov = probe->dtpr_provider;
 551
 552                 if (prov->dtpv_pops.dtps_getargdesc == NULL) {
 553                         /*
 554                          * There isn't any typed information for this probe.
 555                          * Set the argument number to DTRACE_ARGNONE.
 556                          */
 557                         desc->dtargd_ndx = DTRACE_ARGNONE;
 558                 } else {
 559                         desc->dtargd_native[0] = '\0';
 560                         desc->dtargd_xlate[0] = '\0';
 561                         desc->dtargd_mapping = desc->dtargd_ndx;
 562
 563                         prov->dtpv_pops.dtps_getargdesc(prov->dtpv_arg,
 564                             probe->dtpr_id, probe->dtpr_arg, desc);
 565                 }
 566
 567                 mutex_exit(&mod_lock);
 568                 mutex_exit(&dtrace_provider_lock);
 569
 570                 return (0);
 571         }
 572         case DTRACEIOC_PROBEMATCH:
 573         case DTRACEIOC_PROBES: {
 574                 dtrace_probedesc_t *p_desc = (dtrace_probedesc_t *) addr;
 575                 dtrace_probe_t *probe = NULL;
 576                 dtrace_probekey_t pkey;
 577                 dtrace_id_t i;
 578                 int m = 0;
 579                 uint32_t priv = 0;
 580                 uid_t uid = 0;
 581                 zoneid_t zoneid = 0;
 582
 583                 DTRACE_IOCTL_PRINTF("%s(%d): %s\n",__func__,__LINE__,
 584                     cmd == DTRACEIOC_PROBEMATCH ?
 585                     "DTRACEIOC_PROBEMATCH":"DTRACEIOC_PROBES");
 586
 587                 p_desc->dtpd_provider[DTRACE_PROVNAMELEN - 1] = '\0';
 588                 p_desc->dtpd_mod[DTRACE_MODNAMELEN - 1] = '\0';
 589                 p_desc->dtpd_func[DTRACE_FUNCNAMELEN - 1] = '\0';
 590                 p_desc->dtpd_name[DTRACE_NAMELEN - 1] = '\0';
 591
 592                 /*
 593                  * Before we attempt to match this probe, we want to give
 594                  * all providers the opportunity to provide it.
 595                  */
 596                 if (p_desc->dtpd_id == DTRACE_IDNONE) {
 597                         mutex_enter(&dtrace_provider_lock);
 598                         dtrace_probe_provide(p_desc, NULL);
 599                         mutex_exit(&dtrace_provider_lock);
 600                         p_desc->dtpd_id++;
 601                 }
 602
 603                 if (cmd == DTRACEIOC_PROBEMATCH)  {
 604                         dtrace_probekey(p_desc, &pkey);
 605                         pkey.dtpk_id = DTRACE_IDNONE;
 606                 }
 607
 608                 dtrace_cred2priv(td->td_ucred, &priv, &uid, &zoneid);
 609
 610                 mutex_enter(&dtrace_lock);
 611
 612                 if (cmd == DTRACEIOC_PROBEMATCH) {
 613                         for (i = p_desc->dtpd_id; i <= dtrace_nprobes; i++) {
 614                                 if ((probe = dtrace_probes[i - 1]) != NULL &&
 615                                     (m = dtrace_match_probe(probe, &pkey,
 616                                     priv, uid, zoneid)) != 0)
 617                                         break;
 618                         }
 619
 620                         if (m < 0) {
 621                                 mutex_exit(&dtrace_lock);
 622                                 return (EINVAL);
 623                         }
 624
 625                 } else {
 626                         for (i = p_desc->dtpd_id; i <= dtrace_nprobes; i++) {
 627                                 if ((probe = dtrace_probes[i - 1]) != NULL &&
 628                                     dtrace_match_priv(probe, priv, uid, zoneid))
 629                                         break;
 630                         }
 631                 }
 632
 633                 if (probe == NULL) {
 634                         mutex_exit(&dtrace_lock);
 635                         return (ESRCH);
 636                 }
 637
 638                 dtrace_probe_description(probe, p_desc);
 639                 mutex_exit(&dtrace_lock);
 640
 641                 return (0);
 642         }
 643         case DTRACEIOC_PROVIDER: {
 644                 dtrace_providerdesc_t *pvd = (dtrace_providerdesc_t *) addr;
 645                 dtrace_provider_t *pvp;
 646
 647                 DTRACE_IOCTL_PRINTF("%s(%d): DTRACEIOC_PROVIDER\n",__func__,__LINE__);
 648
 649                 pvd->dtvd_name[DTRACE_PROVNAMELEN - 1] = '\0';
 650                 mutex_enter(&dtrace_provider_lock);
 651
 652                 for (pvp = dtrace_provider; pvp != NULL; pvp = pvp->dtpv_next) {
 653                         if (strcmp(pvp->dtpv_name, pvd->dtvd_name) == 0)
 654                                 break;
 655                 }
 656
 657                 mutex_exit(&dtrace_provider_lock);
 658
 659                 if (pvp == NULL)
 660                         return (ESRCH);
 661
 662                 bcopy(&pvp->dtpv_priv, &pvd->dtvd_priv, sizeof (dtrace_ppriv_t));
 663                 bcopy(&pvp->dtpv_attr, &pvd->dtvd_attr, sizeof (dtrace_pattr_t));
 664
 665                 return (0);
 666         }
 667         case DTRACEIOC_REPLICATE: {
 668                 dtrace_repldesc_t *desc = (dtrace_repldesc_t *) addr;
 669                 dtrace_probedesc_t *match = &desc->dtrpd_match;
 670                 dtrace_probedesc_t *create = &desc->dtrpd_create;
 671                 int err;
 672
 673                 DTRACE_IOCTL_PRINTF("%s(%d): DTRACEIOC_REPLICATE\n",__func__,__LINE__);
 674
 675                 match->dtpd_provider[DTRACE_PROVNAMELEN - 1] = '\0';
 676                 match->dtpd_mod[DTRACE_MODNAMELEN - 1] = '\0';
 677                 match->dtpd_func[DTRACE_FUNCNAMELEN - 1] = '\0';
 678                 match->dtpd_name[DTRACE_NAMELEN - 1] = '\0';
 679
 680                 create->dtpd_provider[DTRACE_PROVNAMELEN - 1] = '\0';
 681                 create->dtpd_mod[DTRACE_MODNAMELEN - 1] = '\0';
 682                 create->dtpd_func[DTRACE_FUNCNAMELEN - 1] = '\0';
 683                 create->dtpd_name[DTRACE_NAMELEN - 1] = '\0';
 684
 685                 mutex_enter(&dtrace_lock);
 686                 err = dtrace_enabling_replicate(state, match, create);
 687                 mutex_exit(&dtrace_lock);
 688
 689                 return (err);
 690         }
 691         case DTRACEIOC_STATUS: {
 692                 dtrace_status_t *stat = (dtrace_status_t *) addr;
 693                 dtrace_dstate_t *dstate;
 694                 int i, j;
 695                 uint64_t nerrs;
 696
 697                 DTRACE_IOCTL_PRINTF("%s(%d): DTRACEIOC_STATUS\n",__func__,__LINE__);
 698
 699                 /*
 700                  * See the comment in dtrace_state_deadman() for the reason
 701                  * for setting dts_laststatus to INT64_MAX before setting
 702                  * it to the correct value.
 703                  */
 704                 state->dts_laststatus = INT64_MAX;
 705                 dtrace_membar_producer();
 706                 state->dts_laststatus = dtrace_gethrtime();
 707
 708                 bzero(stat, sizeof (*stat));
 709
 710                 mutex_enter(&dtrace_lock);
 711
 712                 if (state->dts_activity == DTRACE_ACTIVITY_INACTIVE) {
 713                         mutex_exit(&dtrace_lock);
 714                         return (ENOENT);
 715                 }
 716
 717                 if (state->dts_activity == DTRACE_ACTIVITY_DRAINING)
 718                         stat->dtst_exiting = 1;
 719
 720                 nerrs = state->dts_errors;
 721                 dstate = &state->dts_vstate.dtvs_dynvars;
 722
 723                 for (i = 0; i < NCPU; i++) {
 724 #if !defined(sun)
 725                         if (pcpu_find(i) == NULL)
 726                                 continue;
 727 #endif
 728                         dtrace_dstate_percpu_t *dcpu = &dstate->dtds_percpu[i];
 729
 730                         stat->dtst_dyndrops += dcpu->dtdsc_drops;
 731                         stat->dtst_dyndrops_dirty += dcpu->dtdsc_dirty_drops;
 732                         stat->dtst_dyndrops_rinsing += dcpu->dtdsc_rinsing_drops;
 733
 734                         if (state->dts_buffer[i].dtb_flags & DTRACEBUF_FULL)
 735                                 stat->dtst_filled++;
 736
 737                         nerrs += state->dts_buffer[i].dtb_errors;
 738
 739                         for (j = 0; j < state->dts_nspeculations; j++) {
 740                                 dtrace_speculation_t *spec;
 741                                 dtrace_buffer_t *buf;
 742
 743                                 spec = &state->dts_speculations[j];
 744                                 buf = &spec->dtsp_buffer[i];
 745                                 stat->dtst_specdrops += buf->dtb_xamot_drops;
 746                         }
 747                 }
 748
 749                 stat->dtst_specdrops_busy = state->dts_speculations_busy;
 750                 stat->dtst_specdrops_unavail = state->dts_speculations_unavail;
 751                 stat->dtst_stkstroverflows = state->dts_stkstroverflows;
 752                 stat->dtst_dblerrors = state->dts_dblerrors;
 753                 stat->dtst_killed =
 754                     (state->dts_activity == DTRACE_ACTIVITY_KILLED);
 755                 stat->dtst_errors = nerrs;
 756
 757                 mutex_exit(&dtrace_lock);
 758
 759                 return (0);
 760         }
 761         case DTRACEIOC_STOP: {
 762                 int rval;
 763                 processorid_t *cpuid = (processorid_t *) addr;
 764
 765                 DTRACE_IOCTL_PRINTF("%s(%d): DTRACEIOC_STOP\n",__func__,__LINE__);
 766
 767                 mutex_enter(&dtrace_lock);
 768                 rval = dtrace_state_stop(state, cpuid);
 769                 mutex_exit(&dtrace_lock);
 770
 771                 return (rval);
 772         }
 773         default:
 774                 error = ENOTTY;
 775         }
 776         return (error);
 777 }