1 /*- 2 * Copyright (c) 2009 Advanced Computing Technologies LLC 3 * Written by: John H. Baldwin <jhb@FreeBSD.org> 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 /* 29 * Support for x86 machine check architecture. 30 */ 31 32 #include <sys/cdefs.h> 33 __FBSDID("$FreeBSD$"); 34 35 #ifdef __amd64__ 36 #define DEV_APIC 37 #else 38 #include "opt_apic.h" 39 #endif 40 41 #include <sys/param.h> 42 #include <sys/bus.h> 43 #include <sys/interrupt.h> 44 #include <sys/kernel.h> 45 #include <sys/lock.h> 46 #include <sys/malloc.h> 47 #include <sys/mutex.h> 48 #include <sys/proc.h> 49 #include <sys/sched.h> 50 #include <sys/smp.h> 51 #include <sys/sysctl.h> 52 #include <sys/systm.h> 53 #include <sys/taskqueue.h> 54 #include <machine/intr_machdep.h> 55 #include <machine/apicvar.h> 56 #include <machine/cputypes.h> 57 #include <machine/mca.h> 58 #include <machine/md_var.h> 59 #include <machine/specialreg.h> 60 61 /* Modes for mca_scan() */ 62 enum scan_mode { 63 POLLED, 64 MCE, 65 CMCI, 66 }; 67 68 #ifdef DEV_APIC 69 /* 70 * State maintained for each monitored MCx bank to control the 71 * corrected machine check interrupt threshold. 72 */ 73 struct cmc_state { 74 int max_threshold; 75 int last_intr; 76 }; 77 #endif 78 79 struct mca_internal { 80 struct mca_record rec; 81 int logged; 82 STAILQ_ENTRY(mca_internal) link; 83 }; 84 85 static MALLOC_DEFINE(M_MCA, "MCA", "Machine Check Architecture"); 86 87 static int mca_count; /* Number of records stored. */ 88 89 SYSCTL_NODE(_hw, OID_AUTO, mca, CTLFLAG_RD, NULL, "Machine Check Architecture"); 90 91 static int mca_enabled = 1; 92 TUNABLE_INT("hw.mca.enabled", &mca_enabled); 93 SYSCTL_INT(_hw_mca, OID_AUTO, enabled, CTLFLAG_RDTUN, &mca_enabled, 0, 94 "Administrative toggle for machine check support"); 95 96 static int amd10h_L1TP = 1; 97 TUNABLE_INT("hw.mca.amd10h_L1TP", &amd10h_L1TP); 98 SYSCTL_INT(_hw_mca, OID_AUTO, amd10h_L1TP, CTLFLAG_RDTUN, &amd10h_L1TP, 0, 99 "Administrative toggle for logging of level one TLB parity (L1TP) errors"); 100 101 int workaround_erratum383; 102 SYSCTL_INT(_hw_mca, OID_AUTO, erratum383, CTLFLAG_RD, &workaround_erratum383, 0, 103 "Is the workaround for Erratum 383 on AMD Family 10h processors enabled?"); 104 105 static STAILQ_HEAD(, mca_internal) mca_records; 106 static struct callout mca_timer; 107 static int mca_ticks = 3600; /* Check hourly by default. */ 108 static struct task mca_task; 109 static struct mtx mca_lock; 110 111 #ifdef DEV_APIC 112 static struct cmc_state **cmc_state; /* Indexed by cpuid, bank */ 113 static int cmc_banks; 114 static int cmc_throttle = 60; /* Time in seconds to throttle CMCI. */ 115 #endif 116 117 static int 118 sysctl_positive_int(SYSCTL_HANDLER_ARGS) 119 { 120 int error, value; 121 122 value = *(int *)arg1; 123 error = sysctl_handle_int(oidp, &value, 0, req); 124 if (error || req->newptr == NULL) 125 return (error); 126 if (value <= 0) 127 return (EINVAL); 128 *(int *)arg1 = value; 129 return (0); 130 } 131 132 static int 133 sysctl_mca_records(SYSCTL_HANDLER_ARGS) 134 { 135 int *name = (int *)arg1; 136 u_int namelen = arg2; 137 struct mca_record record; 138 struct mca_internal *rec; 139 int i; 140 141 if (namelen != 1) 142 return (EINVAL); 143 144 if (name[0] < 0 || name[0] >= mca_count) 145 return (EINVAL); 146 147 mtx_lock_spin(&mca_lock); 148 if (name[0] >= mca_count) { 149 mtx_unlock_spin(&mca_lock); 150 return (EINVAL); 151 } 152 i = 0; 153 STAILQ_FOREACH(rec, &mca_records, link) { 154 if (i == name[0]) { 155 record = rec->rec; 156 break; 157 } 158 i++; 159 } 160 mtx_unlock_spin(&mca_lock); 161 return (SYSCTL_OUT(req, &record, sizeof(record))); 162 } 163 164 static const char * 165 mca_error_ttype(uint16_t mca_error) 166 { 167 168 switch ((mca_error & 0x000c) >> 2) { 169 case 0: 170 return ("I"); 171 case 1: 172 return ("D"); 173 case 2: 174 return ("G"); 175 } 176 return ("?"); 177 } 178 179 static const char * 180 mca_error_level(uint16_t mca_error) 181 { 182 183 switch (mca_error & 0x0003) { 184 case 0: 185 return ("L0"); 186 case 1: 187 return ("L1"); 188 case 2: 189 return ("L2"); 190 case 3: 191 return ("LG"); 192 } 193 return ("L?"); 194 } 195 196 static const char * 197 mca_error_request(uint16_t mca_error) 198 { 199 200 switch ((mca_error & 0x00f0) >> 4) { 201 case 0x0: 202 return ("ERR"); 203 case 0x1: 204 return ("RD"); 205 case 0x2: 206 return ("WR"); 207 case 0x3: 208 return ("DRD"); 209 case 0x4: 210 return ("DWR"); 211 case 0x5: 212 return ("IRD"); 213 case 0x6: 214 return ("PREFETCH"); 215 case 0x7: 216 return ("EVICT"); 217 case 0x8: 218 return ("SNOOP"); 219 } 220 return ("???"); 221 } 222 223 static const char * 224 mca_error_mmtype(uint16_t mca_error) 225 { 226 227 switch ((mca_error & 0x70) >> 4) { 228 case 0x0: 229 return ("GEN"); 230 case 0x1: 231 return ("RD"); 232 case 0x2: 233 return ("WR"); 234 case 0x3: 235 return ("AC"); 236 case 0x4: 237 return ("MS"); 238 } 239 return ("???"); 240 } 241 242 /* Dump details about a single machine check. */ 243 static void __nonnull(1) 244 mca_log(const struct mca_record *rec) 245 { 246 uint16_t mca_error; 247 248 printf("MCA: Bank %d, Status 0x%016llx\n", rec->mr_bank, 249 (long long)rec->mr_status); 250 printf("MCA: Global Cap 0x%016llx, Status 0x%016llx\n", 251 (long long)rec->mr_mcg_cap, (long long)rec->mr_mcg_status); 252 printf("MCA: Vendor \"%s\", ID 0x%x, APIC ID %d\n", cpu_vendor, 253 rec->mr_cpu_id, rec->mr_apic_id); 254 printf("MCA: CPU %d ", rec->mr_cpu); 255 if (rec->mr_status & MC_STATUS_UC) 256 printf("UNCOR "); 257 else { 258 printf("COR "); 259 if (rec->mr_mcg_cap & MCG_CAP_TES_P) 260 printf("(%lld) ", ((long long)rec->mr_status & 261 MC_STATUS_COR_COUNT) >> 38); 262 } 263 if (rec->mr_status & MC_STATUS_PCC) 264 printf("PCC "); 265 if (rec->mr_status & MC_STATUS_OVER) 266 printf("OVER "); 267 mca_error = rec->mr_status & MC_STATUS_MCA_ERROR; 268 switch (mca_error) { 269 /* Simple error codes. */ 270 case 0x0000: 271 printf("no error"); 272 break; 273 case 0x0001: 274 printf("unclassified error"); 275 break; 276 case 0x0002: 277 printf("ucode ROM parity error"); 278 break; 279 case 0x0003: 280 printf("external error"); 281 break; 282 case 0x0004: 283 printf("FRC error"); 284 break; 285 case 0x0005: 286 printf("internal parity error"); 287 break; 288 case 0x0400: 289 printf("internal timer error"); 290 break; 291 default: 292 if ((mca_error & 0xfc00) == 0x0400) { 293 printf("internal error %x", mca_error & 0x03ff); 294 break; 295 } 296 297 /* Compound error codes. */ 298 299 /* Memory hierarchy error. */ 300 if ((mca_error & 0xeffc) == 0x000c) { 301 printf("%s memory error", mca_error_level(mca_error)); 302 break; 303 } 304 305 /* TLB error. */ 306 if ((mca_error & 0xeff0) == 0x0010) { 307 printf("%sTLB %s error", mca_error_ttype(mca_error), 308 mca_error_level(mca_error)); 309 break; 310 } 311 312 /* Memory controller error. */ 313 if ((mca_error & 0xef80) == 0x0080) { 314 printf("%s channel ", mca_error_mmtype(mca_error)); 315 if ((mca_error & 0x000f) != 0x000f) 316 printf("%d", mca_error & 0x000f); 317 else 318 printf("??"); 319 printf(" memory error"); 320 break; 321 } 322 323 /* Cache error. */ 324 if ((mca_error & 0xef00) == 0x0100) { 325 printf("%sCACHE %s %s error", 326 mca_error_ttype(mca_error), 327 mca_error_level(mca_error), 328 mca_error_request(mca_error)); 329 break; 330 } 331 332 /* Bus and/or Interconnect error. */ 333 if ((mca_error & 0xe800) == 0x0800) { 334 printf("BUS%s ", mca_error_level(mca_error)); 335 switch ((mca_error & 0x0600) >> 9) { 336 case 0: 337 printf("Source"); 338 break; 339 case 1: 340 printf("Responder"); 341 break; 342 case 2: 343 printf("Observer"); 344 break; 345 default: 346 printf("???"); 347 break; 348 } 349 printf(" %s ", mca_error_request(mca_error)); 350 switch ((mca_error & 0x000c) >> 2) { 351 case 0: 352 printf("Memory"); 353 break; 354 case 2: 355 printf("I/O"); 356 break; 357 case 3: 358 printf("Other"); 359 break; 360 default: 361 printf("???"); 362 break; 363 } 364 if (mca_error & 0x0100) 365 printf(" timed out"); 366 break; 367 } 368 369 printf("unknown error %x", mca_error); 370 break; 371 } 372 printf("\n"); 373 if (rec->mr_status & MC_STATUS_ADDRV) 374 printf("MCA: Address 0x%llx\n", (long long)rec->mr_addr); 375 if (rec->mr_status & MC_STATUS_MISCV) 376 printf("MCA: Misc 0x%llx\n", (long long)rec->mr_misc); 377 } 378 379 static int __nonnull(2) 380 mca_check_status(int bank, struct mca_record *rec) 381 { 382 uint64_t status; 383 u_int p[4]; 384 385 status = rdmsr(MSR_MC_STATUS(bank)); 386 if (!(status & MC_STATUS_VAL)) 387 return (0); 388 389 /* Save exception information. */ 390 rec->mr_status = status; 391 rec->mr_bank = bank; 392 rec->mr_addr = 0; 393 if (status & MC_STATUS_ADDRV) 394 rec->mr_addr = rdmsr(MSR_MC_ADDR(bank)); 395 rec->mr_misc = 0; 396 if (status & MC_STATUS_MISCV) 397 rec->mr_misc = rdmsr(MSR_MC_MISC(bank)); 398 rec->mr_tsc = rdtsc(); 399 rec->mr_apic_id = PCPU_GET(apic_id); 400 rec->mr_mcg_cap = rdmsr(MSR_MCG_CAP); 401 rec->mr_mcg_status = rdmsr(MSR_MCG_STATUS); 402 rec->mr_cpu_id = cpu_id; 403 rec->mr_cpu_vendor_id = cpu_vendor_id; 404 rec->mr_cpu = PCPU_GET(cpuid); 405 406 /* 407 * Clear machine check. Don't do this for uncorrectable 408 * errors so that the BIOS can see them. 409 */ 410 if (!(rec->mr_status & (MC_STATUS_PCC | MC_STATUS_UC))) { 411 wrmsr(MSR_MC_STATUS(bank), 0); 412 do_cpuid(0, p); 413 } 414 return (1); 415 } 416 417 static void __nonnull(1) 418 mca_record_entry(const struct mca_record *record) 419 { 420 struct mca_internal *rec; 421 422 rec = malloc(sizeof(*rec), M_MCA, M_NOWAIT); 423 if (rec == NULL) { 424 printf("MCA: Unable to allocate space for an event.\n"); 425 mca_log(record); 426 return; 427 } 428 429 rec->rec = *record; 430 rec->logged = 0; 431 mtx_lock_spin(&mca_lock); 432 STAILQ_INSERT_TAIL(&mca_records, rec, link); 433 mca_count++; 434 mtx_unlock_spin(&mca_lock); 435 } 436 437 #ifdef DEV_APIC 438 /* 439 * Update the interrupt threshold for a CMCI. The strategy is to use 440 * a low trigger that interrupts as soon as the first event occurs. 441 * However, if a steady stream of events arrive, the threshold is 442 * increased until the interrupts are throttled to once every 443 * cmc_throttle seconds or the periodic scan. If a periodic scan 444 * finds that the threshold is too high, it is lowered. 445 */ 446 static void 447 cmci_update(enum scan_mode mode, int bank, int valid, struct mca_record *rec) 448 { 449 struct cmc_state *cc; 450 uint64_t ctl; 451 u_int delta; 452 int count, limit; 453 454 /* Fetch the current limit for this bank. */ 455 cc = &cmc_state[PCPU_GET(cpuid)][bank]; 456 ctl = rdmsr(MSR_MC_CTL2(bank)); 457 count = (rec->mr_status & MC_STATUS_COR_COUNT) >> 38; 458 delta = (u_int)(ticks - cc->last_intr); 459 460 /* 461 * If an interrupt was received less than cmc_throttle seconds 462 * since the previous interrupt and the count from the current 463 * event is greater than or equal to the current threshold, 464 * double the threshold up to the max. 465 */ 466 if (mode == CMCI && valid) { 467 limit = ctl & MC_CTL2_THRESHOLD; 468 if (delta < cmc_throttle && count >= limit && 469 limit < cc->max_threshold) { 470 limit = min(limit << 1, cc->max_threshold); 471 ctl &= ~MC_CTL2_THRESHOLD; 472 ctl |= limit; 473 wrmsr(MSR_MC_CTL2(bank), limit); 474 } 475 cc->last_intr = ticks; 476 return; 477 } 478 479 /* 480 * When the banks are polled, check to see if the threshold 481 * should be lowered. 482 */ 483 if (mode != POLLED) 484 return; 485 486 /* If a CMCI occured recently, do nothing for now. */ 487 if (delta < cmc_throttle) 488 return; 489 490 /* 491 * Compute a new limit based on the average rate of events per 492 * cmc_throttle seconds since the last interrupt. 493 */ 494 if (valid) { 495 count = (rec->mr_status & MC_STATUS_COR_COUNT) >> 38; 496 limit = count * cmc_throttle / delta; 497 if (limit <= 0) 498 limit = 1; 499 else if (limit > cc->max_threshold) 500 limit = cc->max_threshold; 501 } else 502 limit = 1; 503 if ((ctl & MC_CTL2_THRESHOLD) != limit) { 504 ctl &= ~MC_CTL2_THRESHOLD; 505 ctl |= limit; 506 wrmsr(MSR_MC_CTL2(bank), limit); 507 } 508 } 509 #endif 510 511 /* 512 * This scans all the machine check banks of the current CPU to see if 513 * there are any machine checks. Any non-recoverable errors are 514 * reported immediately via mca_log(). The current thread must be 515 * pinned when this is called. The 'mode' parameter indicates if we 516 * are being called from the MC exception handler, the CMCI handler, 517 * or the periodic poller. In the MC exception case this function 518 * returns true if the system is restartable. Otherwise, it returns a 519 * count of the number of valid MC records found. 520 */ 521 static int 522 mca_scan(enum scan_mode mode) 523 { 524 struct mca_record rec; 525 uint64_t mcg_cap, ucmask; 526 int count, i, recoverable, valid; 527 528 count = 0; 529 recoverable = 1; 530 ucmask = MC_STATUS_UC | MC_STATUS_PCC; 531 532 /* When handling a MCE#, treat the OVER flag as non-restartable. */ 533 if (mode == MCE) 534 ucmask |= MC_STATUS_OVER; 535 mcg_cap = rdmsr(MSR_MCG_CAP); 536 for (i = 0; i < (mcg_cap & MCG_CAP_COUNT); i++) { 537 #ifdef DEV_APIC 538 /* 539 * For a CMCI, only check banks this CPU is 540 * responsible for. 541 */ 542 if (mode == CMCI && !(PCPU_GET(cmci_mask) & 1 << i)) 543 continue; 544 #endif 545 546 valid = mca_check_status(i, &rec); 547 if (valid) { 548 count++; 549 if (rec.mr_status & ucmask) { 550 recoverable = 0; 551 mca_log(&rec); 552 } 553 mca_record_entry(&rec); 554 } 555 556 #ifdef DEV_APIC 557 /* 558 * If this is a bank this CPU monitors via CMCI, 559 * update the threshold. 560 */ 561 if (PCPU_GET(cmci_mask) & 1 << i) 562 cmci_update(mode, i, valid, &rec); 563 #endif 564 } 565 return (mode == MCE ? recoverable : count); 566 } 567 568 /* 569 * Scan the machine check banks on all CPUs by binding to each CPU in 570 * turn. If any of the CPUs contained new machine check records, log 571 * them to the console. 572 */ 573 static void 574 mca_scan_cpus(void *context, int pending) 575 { 576 struct mca_internal *mca; 577 struct thread *td; 578 int count, cpu; 579 580 td = curthread; 581 count = 0; 582 thread_lock(td); 583 CPU_FOREACH(cpu) { 584 sched_bind(td, cpu); 585 thread_unlock(td); 586 count += mca_scan(POLLED); 587 thread_lock(td); 588 sched_unbind(td); 589 } 590 thread_unlock(td); 591 if (count != 0) { 592 mtx_lock_spin(&mca_lock); 593 STAILQ_FOREACH(mca, &mca_records, link) { 594 if (!mca->logged) { 595 mca->logged = 1; 596 mtx_unlock_spin(&mca_lock); 597 mca_log(&mca->rec); 598 mtx_lock_spin(&mca_lock); 599 } 600 } 601 mtx_unlock_spin(&mca_lock); 602 } 603 } 604 605 static void 606 mca_periodic_scan(void *arg) 607 { 608 609 taskqueue_enqueue(taskqueue_thread, &mca_task); 610 callout_reset(&mca_timer, mca_ticks * hz, mca_periodic_scan, NULL); 611 } 612 613 static int 614 sysctl_mca_scan(SYSCTL_HANDLER_ARGS) 615 { 616 int error, i; 617 618 i = 0; 619 error = sysctl_handle_int(oidp, &i, 0, req); 620 if (error) 621 return (error); 622 if (i) 623 taskqueue_enqueue(taskqueue_thread, &mca_task); 624 return (0); 625 } 626 627 static void 628 mca_startup(void *dummy) 629 { 630 631 if (!mca_enabled || !(cpu_feature & CPUID_MCA)) 632 return; 633 634 callout_reset(&mca_timer, mca_ticks * hz, mca_periodic_scan, 635 NULL); 636 } 637 SYSINIT(mca_startup, SI_SUB_SMP, SI_ORDER_ANY, mca_startup, NULL); 638 639 #ifdef DEV_APIC 640 static void 641 cmci_setup(uint64_t mcg_cap) 642 { 643 int i; 644 645 cmc_state = malloc((mp_maxid + 1) * sizeof(struct cmc_state **), 646 M_MCA, M_WAITOK); 647 cmc_banks = mcg_cap & MCG_CAP_COUNT; 648 for (i = 0; i <= mp_maxid; i++) 649 cmc_state[i] = malloc(sizeof(struct cmc_state) * cmc_banks, 650 M_MCA, M_WAITOK | M_ZERO); 651 SYSCTL_ADD_PROC(NULL, SYSCTL_STATIC_CHILDREN(_hw_mca), OID_AUTO, 652 "cmc_throttle", CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 653 &cmc_throttle, 0, sysctl_positive_int, "I", 654 "Interval in seconds to throttle corrected MC interrupts"); 655 } 656 #endif 657 658 static void 659 mca_setup(uint64_t mcg_cap) 660 { 661 662 mtx_init(&mca_lock, "mca", NULL, MTX_SPIN); 663 STAILQ_INIT(&mca_records); 664 TASK_INIT(&mca_task, 0x8000, mca_scan_cpus, NULL); 665 callout_init(&mca_timer, CALLOUT_MPSAFE); 666 SYSCTL_ADD_INT(NULL, SYSCTL_STATIC_CHILDREN(_hw_mca), OID_AUTO, 667 "count", CTLFLAG_RD, &mca_count, 0, "Record count"); 668 SYSCTL_ADD_PROC(NULL, SYSCTL_STATIC_CHILDREN(_hw_mca), OID_AUTO, 669 "interval", CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, &mca_ticks, 670 0, sysctl_positive_int, "I", 671 "Periodic interval in seconds to scan for machine checks"); 672 SYSCTL_ADD_NODE(NULL, SYSCTL_STATIC_CHILDREN(_hw_mca), OID_AUTO, 673 "records", CTLFLAG_RD, sysctl_mca_records, "Machine check records"); 674 SYSCTL_ADD_PROC(NULL, SYSCTL_STATIC_CHILDREN(_hw_mca), OID_AUTO, 675 "force_scan", CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, NULL, 0, 676 sysctl_mca_scan, "I", "Force an immediate scan for machine checks"); 677 #ifdef DEV_APIC 678 if (mcg_cap & MCG_CAP_CMCI_P) 679 cmci_setup(mcg_cap); 680 #endif 681 } 682 683 #ifdef DEV_APIC 684 /* 685 * See if we should monitor CMCI for this bank. If CMCI_EN is already 686 * set in MC_CTL2, then another CPU is responsible for this bank, so 687 * ignore it. If CMCI_EN returns zero after being set, then this bank 688 * does not support CMCI_EN. If this CPU sets CMCI_EN, then it should 689 * now monitor this bank. 690 */ 691 static void 692 cmci_monitor(int i) 693 { 694 struct cmc_state *cc; 695 uint64_t ctl; 696 697 KASSERT(i < cmc_banks, ("CPU %d has more MC banks", PCPU_GET(cpuid))); 698 699 ctl = rdmsr(MSR_MC_CTL2(i)); 700 if (ctl & MC_CTL2_CMCI_EN) 701 /* Already monitored by another CPU. */ 702 return; 703 704 /* Set the threshold to one event for now. */ 705 ctl &= ~MC_CTL2_THRESHOLD; 706 ctl |= MC_CTL2_CMCI_EN | 1; 707 wrmsr(MSR_MC_CTL2(i), ctl); 708 ctl = rdmsr(MSR_MC_CTL2(i)); 709 if (!(ctl & MC_CTL2_CMCI_EN)) 710 /* This bank does not support CMCI. */ 711 return; 712 713 cc = &cmc_state[PCPU_GET(cpuid)][i]; 714 715 /* Determine maximum threshold. */ 716 ctl &= ~MC_CTL2_THRESHOLD; 717 ctl |= 0x7fff; 718 wrmsr(MSR_MC_CTL2(i), ctl); 719 ctl = rdmsr(MSR_MC_CTL2(i)); 720 cc->max_threshold = ctl & MC_CTL2_THRESHOLD; 721 722 /* Start off with a threshold of 1. */ 723 ctl &= ~MC_CTL2_THRESHOLD; 724 ctl |= 1; 725 wrmsr(MSR_MC_CTL2(i), ctl); 726 727 /* Mark this bank as monitored. */ 728 PCPU_SET(cmci_mask, PCPU_GET(cmci_mask) | 1 << i); 729 } 730 #endif 731 732 /* Must be executed on each CPU. */ 733 void 734 mca_init(void) 735 { 736 uint64_t mcg_cap; 737 uint64_t ctl, mask; 738 int skip; 739 int i; 740 741 /* MCE is required. */ 742 if (!mca_enabled || !(cpu_feature & CPUID_MCE)) 743 return; 744 745 /* 746 * On AMD Family 10h processors, unless logging of level one TLB 747 * parity (L1TP) errors is disabled, enable the recommended workaround 748 * for Erratum 383. 749 */ 750 if (cpu_vendor_id == CPU_VENDOR_AMD && 751 CPUID_TO_FAMILY(cpu_id) == 0x10 && amd10h_L1TP) 752 workaround_erratum383 = 1; 753 754 if (cpu_feature & CPUID_MCA) { 755 PCPU_SET(cmci_mask, 0); 756 757 mcg_cap = rdmsr(MSR_MCG_CAP); 758 if (mcg_cap & MCG_CAP_CTL_P) 759 /* Enable MCA features. */ 760 wrmsr(MSR_MCG_CTL, MCG_CTL_ENABLE); 761 if (PCPU_GET(cpuid) == 0) 762 mca_setup(mcg_cap); 763 764 /* 765 * Disable logging of level one TLB parity (L1TP) errors by 766 * the data cache as an alternative workaround for AMD Family 767 * 10h Erratum 383. Unlike the recommended workaround, there 768 * is no performance penalty to this workaround. However, 769 * L1TP errors will go unreported. 770 */ 771 if (cpu_vendor_id == CPU_VENDOR_AMD && 772 CPUID_TO_FAMILY(cpu_id) == 0x10 && !amd10h_L1TP) { 773 mask = rdmsr(MSR_MC0_CTL_MASK); 774 if ((mask & (1UL << 5)) == 0) 775 wrmsr(MSR_MC0_CTL_MASK, mask | (1UL << 5)); 776 } 777 for (i = 0; i < (mcg_cap & MCG_CAP_COUNT); i++) { 778 /* By default enable logging of all errors. */ 779 ctl = 0xffffffffffffffffUL; 780 skip = 0; 781 782 if (cpu_vendor_id == CPU_VENDOR_INTEL) { 783 /* 784 * For P6 models before Nehalem MC0_CTL is 785 * always enabled and reserved. 786 */ 787 if (i == 0 && CPUID_TO_FAMILY(cpu_id) == 0x6 788 && CPUID_TO_MODEL(cpu_id) < 0x1a) 789 skip = 1; 790 } else if (cpu_vendor_id == CPU_VENDOR_AMD) { 791 /* BKDG for Family 10h: unset GartTblWkEn. */ 792 if (i == 4 && CPUID_TO_FAMILY(cpu_id) >= 0xf) 793 ctl &= ~(1UL << 10); 794 } 795 796 if (!skip) 797 wrmsr(MSR_MC_CTL(i), ctl); 798 799 #ifdef DEV_APIC 800 if (mcg_cap & MCG_CAP_CMCI_P) 801 cmci_monitor(i); 802 #endif 803 804 /* Clear all errors. */ 805 wrmsr(MSR_MC_STATUS(i), 0); 806 } 807 808 #ifdef DEV_APIC 809 if (PCPU_GET(cmci_mask) != 0) 810 lapic_enable_cmc(); 811 #endif 812 } 813 814 load_cr4(rcr4() | CR4_MCE); 815 } 816 817 /* 818 * The machine check registers for the BSP cannot be initialized until 819 * the local APIC is initialized. This happens at SI_SUB_CPU, 820 * SI_ORDER_SECOND. 821 */ 822 static void 823 mca_init_bsp(void *arg __unused) 824 { 825 826 mca_init(); 827 } 828 SYSINIT(mca_init_bsp, SI_SUB_CPU, SI_ORDER_ANY, mca_init_bsp, NULL); 829 830 /* Called when a machine check exception fires. */ 831 int 832 mca_intr(void) 833 { 834 uint64_t mcg_status; 835 int recoverable; 836 837 if (!(cpu_feature & CPUID_MCA)) { 838 /* 839 * Just print the values of the old Pentium registers 840 * and panic. 841 */ 842 printf("MC Type: 0x%jx Address: 0x%jx\n", 843 (uintmax_t)rdmsr(MSR_P5_MC_TYPE), 844 (uintmax_t)rdmsr(MSR_P5_MC_ADDR)); 845 return (0); 846 } 847 848 /* Scan the banks and check for any non-recoverable errors. */ 849 recoverable = mca_scan(MCE); 850 mcg_status = rdmsr(MSR_MCG_STATUS); 851 if (!(mcg_status & MCG_STATUS_RIPV)) 852 recoverable = 0; 853 854 /* Clear MCIP. */ 855 wrmsr(MSR_MCG_STATUS, mcg_status & ~MCG_STATUS_MCIP); 856 return (recoverable); 857 } 858 859 #ifdef DEV_APIC 860 /* Called for a CMCI (correctable machine check interrupt). */ 861 void 862 cmc_intr(void) 863 { 864 struct mca_internal *mca; 865 int count; 866 867 /* 868 * Serialize MCA bank scanning to prevent collisions from 869 * sibling threads. 870 */ 871 count = mca_scan(CMCI); 872 873 /* If we found anything, log them to the console. */ 874 if (count != 0) { 875 mtx_lock_spin(&mca_lock); 876 STAILQ_FOREACH(mca, &mca_records, link) { 877 if (!mca->logged) { 878 mca->logged = 1; 879 mtx_unlock_spin(&mca_lock); 880 mca_log(&mca->rec); 881 mtx_lock_spin(&mca_lock); 882 } 883 } 884 mtx_unlock_spin(&mca_lock); 885 } 886 } 887 #endif 888