arch/x86/kernel/cpu/mcheck/mce_amd.c

   1 /*
   2  *  (c) 2005, 2006 Advanced Micro Devices, Inc.
   3  *  Your use of this code is subject to the terms and conditions of the
   4  *  GNU general public license version 2. See "COPYING" or
   5  *  http://www.gnu.org/licenses/gpl.html
   6  *
   7  *  Written by Jacob Shin - AMD, Inc.
   8  *
   9  *  Support : jacob.shin@amd.com
  10  *
  11  *  April 2006
  12  *     - added support for AMD Family 0x10 processors
  13  *
  14  *  All MC4_MISCi registers are shared between multi-cores
  15  */
  16 #include <linux/interrupt.h>
  17 #include <linux/notifier.h>
  18 #include <linux/kobject.h>
  19 #include <linux/percpu.h>
  20 #include <linux/sysdev.h>
  21 #include <linux/errno.h>
  22 #include <linux/sched.h>
  23 #include <linux/sysfs.h>
  24 #include <linux/init.h>
  25 #include <linux/cpu.h>
  26 #include <linux/smp.h>
  27
  28 #include <asm/apic.h>
  29 #include <asm/idle.h>
  30 #include <asm/mce.h>
  31 #include <asm/msr.h>
  32
  33 #define PFX               "mce_threshold: "
  34 #define VERSION           "version 1.1.1"
  35 #define NR_BANKS          6
  36 #define NR_BLOCKS         9
  37 #define THRESHOLD_MAX     0xFFF
  38 #define INT_TYPE_APIC     0x00020000
  39 #define MASK_VALID_HI     0x80000000
  40 #define MASK_CNTP_HI      0x40000000
  41 #define MASK_LOCKED_HI    0x20000000
  42 #define MASK_LVTOFF_HI    0x00F00000
  43 #define MASK_COUNT_EN_HI  0x00080000
  44 #define MASK_INT_TYPE_HI  0x00060000
  45 #define MASK_OVERFLOW_HI  0x00010000
  46 #define MASK_ERR_COUNT_HI 0x00000FFF
  47 #define MASK_BLKPTR_LO    0xFF000000
  48 #define MCG_XBLK_ADDR     0xC0000400
  49
  50 struct threshold_block {
  51         unsigned int            block;
  52         unsigned int            bank;
  53         unsigned int            cpu;
  54         u32                     address;
  55         u16                     interrupt_enable;
  56         u16                     threshold_limit;
  57         struct kobject          kobj;
  58         struct list_head        miscj;
  59 };
  60
  61 /* defaults used early on boot */
  62 static struct threshold_block threshold_defaults = {
  63         .interrupt_enable       = 0,
  64         .threshold_limit        = THRESHOLD_MAX,
  65 };
  66
  67 struct threshold_bank {
  68         struct kobject          *kobj;
  69         struct threshold_block  *blocks;
  70         cpumask_var_t           cpus;
  71 };
  72 static DEFINE_PER_CPU(struct threshold_bank * [NR_BANKS], threshold_banks);
  73
  74 #ifdef CONFIG_SMP
  75 static unsigned char shared_bank[NR_BANKS] = {
  76         0, 0, 0, 0, 1
  77 };
  78 #endif
  79
  80 static DEFINE_PER_CPU(unsigned char, bank_map); /* see which banks are on */
  81
  82 static void amd_threshold_interrupt(void);
  83
  84 /*
  85  * CPU Initialization
  86  */
  87
  88 struct thresh_restart {
  89         struct threshold_block  *b;
  90         int                     reset;
  91         u16                     old_limit;
  92 };
  93
  94 /* must be called with correct cpu affinity */
  95 /* Called via smp_call_function_single() */
  96 static void threshold_restart_bank(void *_tr)
  97 {
  98         struct thresh_restart *tr = _tr;
  99         u32 mci_misc_hi, mci_misc_lo;
 100
 101         rdmsr(tr->b->address, mci_misc_lo, mci_misc_hi);
 102
 103         if (tr->b->threshold_limit < (mci_misc_hi & THRESHOLD_MAX))
 104                 tr->reset = 1;  /* limit cannot be lower than err count */
 105
 106         if (tr->reset) {                /* reset err count and overflow bit */
 107                 mci_misc_hi =
 108                     (mci_misc_hi & ~(MASK_ERR_COUNT_HI | MASK_OVERFLOW_HI)) |
 109                     (THRESHOLD_MAX - tr->b->threshold_limit);
 110         } else if (tr->old_limit) {     /* change limit w/o reset */
 111                 int new_count = (mci_misc_hi & THRESHOLD_MAX) +
 112                     (tr->old_limit - tr->b->threshold_limit);
 113
 114                 mci_misc_hi = (mci_misc_hi & ~MASK_ERR_COUNT_HI) |
 115                     (new_count & THRESHOLD_MAX);
 116         }
 117
 118         tr->b->interrupt_enable ?
 119             (mci_misc_hi = (mci_misc_hi & ~MASK_INT_TYPE_HI) | INT_TYPE_APIC) :
 120             (mci_misc_hi &= ~MASK_INT_TYPE_HI);
 121
 122         mci_misc_hi |= MASK_COUNT_EN_HI;
 123         wrmsr(tr->b->address, mci_misc_lo, mci_misc_hi);
 124 }
 125
 126 /* cpu init entry point, called from mce.c with preempt off */
 127 void mce_amd_feature_init(struct cpuinfo_x86 *c)
 128 {
 129         unsigned int cpu = smp_processor_id();
 130         u32 low = 0, high = 0, address = 0;
 131         unsigned int bank, block;
 132         struct thresh_restart tr;
 133         u8 lvt_off;
 134
 135         for (bank = 0; bank < NR_BANKS; ++bank) {
 136                 for (block = 0; block < NR_BLOCKS; ++block) {
 137                         if (block == 0)
 138                                 address = MSR_IA32_MC0_MISC + bank * 4;
 139                         else if (block == 1) {
 140                                 address = (low & MASK_BLKPTR_LO) >> 21;
 141                                 if (!address)
 142                                         break;
 143                                 address += MCG_XBLK_ADDR;
 144                         } else
 145                                 ++address;
 146
 147                         if (rdmsr_safe(address, &low, &high))
 148                                 break;
 149
 150                         if (!(high & MASK_VALID_HI)) {
 151                                 if (block)
 152                                         continue;
 153                                 else
 154                                         break;
 155                         }
 156
 157                         if (!(high & MASK_CNTP_HI)  ||
 158                              (high & MASK_LOCKED_HI))
 159                                 continue;
 160
 161                         if (!block)
 162                                 per_cpu(bank_map, cpu) |= (1 << bank);
 163 #ifdef CONFIG_SMP
 164                         if (shared_bank[bank] && c->cpu_core_id)
 165                                 break;
 166 #endif
 167                         lvt_off = setup_APIC_eilvt_mce(THRESHOLD_APIC_VECTOR,
 168                                                        APIC_EILVT_MSG_FIX, 0);
 169
 170                         high &= ~MASK_LVTOFF_HI;
 171                         high |= lvt_off << 20;
 172                         wrmsr(address, low, high);
 173
 174                         threshold_defaults.address = address;
 175                         tr.b = &threshold_defaults;
 176                         tr.reset = 0;
 177                         tr.old_limit = 0;
 178                         threshold_restart_bank(&tr);
 179
 180                         mce_threshold_vector = amd_threshold_interrupt;
 181                 }
 182         }
 183 }
 184
 185 /*
 186  * APIC Interrupt Handler
 187  */
 188
 189 /*
 190  * threshold interrupt handler will service THRESHOLD_APIC_VECTOR.
 191  * the interrupt goes off when error_count reaches threshold_limit.
 192  * the handler will simply log mcelog w/ software defined bank number.
 193  */
 194 static void amd_threshold_interrupt(void)
 195 {
 196         u32 low = 0, high = 0, address = 0;
 197         unsigned int bank, block;
 198         struct mce m;
 199
 200         mce_setup(&m);
 201
 202         /* assume first bank caused it */
 203         for (bank = 0; bank < NR_BANKS; ++bank) {
 204                 if (!(per_cpu(bank_map, m.cpu) & (1 << bank)))
 205                         continue;
 206                 for (block = 0; block < NR_BLOCKS; ++block) {
 207                         if (block == 0) {
 208                                 address = MSR_IA32_MC0_MISC + bank * 4;
 209                         } else if (block == 1) {
 210                                 address = (low & MASK_BLKPTR_LO) >> 21;
 211                                 if (!address)
 212                                         break;
 213                                 address += MCG_XBLK_ADDR;
 214                         } else {
 215                                 ++address;
 216                         }
 217
 218                         if (rdmsr_safe(address, &low, &high))
 219                                 break;
 220
 221                         if (!(high & MASK_VALID_HI)) {
 222                                 if (block)
 223                                         continue;
 224                                 else
 225                                         break;
 226                         }
 227
 228                         if (!(high & MASK_CNTP_HI)  ||
 229                              (high & MASK_LOCKED_HI))
 230                                 continue;
 231
 232                         /*
 233                          * Log the machine check that caused the threshold
 234                          * event.
 235                          */
 236                         machine_check_poll(MCP_TIMESTAMP,
 237                                         &__get_cpu_var(mce_poll_banks));
 238
 239                         if (high & MASK_OVERFLOW_HI) {
 240                                 rdmsrl(address, m.misc);
 241                                 rdmsrl(MSR_IA32_MC0_STATUS + bank * 4,
 242                                        m.status);
 243                                 m.bank = K8_MCE_THRESHOLD_BASE
 244                                        + bank * NR_BLOCKS
 245                                        + block;
 246                                 mce_log(&m);
 247                                 return;
 248                         }
 249                 }
 250         }
 251 }
 252
 253 /*
 254  * Sysfs Interface
 255  */
 256
 257 struct threshold_attr {
 258         struct attribute attr;
 259         ssize_t (*show) (struct threshold_block *, char *);
 260         ssize_t (*store) (struct threshold_block *, const char *, size_t count);
 261 };
 262
 263 #define SHOW_FIELDS(name)                                               \
 264 static ssize_t show_ ## name(struct threshold_block *b, char *buf)      \
 265 {                                                                       \
 266         return sprintf(buf, "%lx\n", (unsigned long) b->name);          \
 267 }
 268 SHOW_FIELDS(interrupt_enable)
 269 SHOW_FIELDS(threshold_limit)
 270
 271 static ssize_t
 272 store_interrupt_enable(struct threshold_block *b, const char *buf, size_t size)
 273 {
 274         struct thresh_restart tr;
 275         unsigned long new;
 276
 277         if (strict_strtoul(buf, 0, &new) < 0)
 278                 return -EINVAL;
 279
 280         b->interrupt_enable = !!new;
 281
 282         tr.b            = b;
 283         tr.reset        = 0;
 284         tr.old_limit    = 0;
 285
 286         smp_call_function_single(b->cpu, threshold_restart_bank, &tr, 1);
 287
 288         return size;
 289 }
 290
 291 static ssize_t
 292 store_threshold_limit(struct threshold_block *b, const char *buf, size_t size)
 293 {
 294         struct thresh_restart tr;
 295         unsigned long new;
 296
 297         if (strict_strtoul(buf, 0, &new) < 0)
 298                 return -EINVAL;
 299
 300         if (new > THRESHOLD_MAX)
 301                 new = THRESHOLD_MAX;
 302         if (new < 1)
 303                 new = 1;
 304
 305         tr.old_limit = b->threshold_limit;
 306         b->threshold_limit = new;
 307         tr.b = b;
 308         tr.reset = 0;
 309
 310         smp_call_function_single(b->cpu, threshold_restart_bank, &tr, 1);
 311
 312         return size;
 313 }
 314
 315 struct threshold_block_cross_cpu {
 316         struct threshold_block  *tb;
 317         long                    retval;
 318 };
 319
 320 static void local_error_count_handler(void *_tbcc)
 321 {
 322         struct threshold_block_cross_cpu *tbcc = _tbcc;
 323         struct threshold_block *b = tbcc->tb;
 324         u32 low, high;
 325
 326         rdmsr(b->address, low, high);
 327         tbcc->retval = (high & 0xFFF) - (THRESHOLD_MAX - b->threshold_limit);
 328 }
 329
 330 static ssize_t show_error_count(struct threshold_block *b, char *buf)
 331 {
 332         struct threshold_block_cross_cpu tbcc = { .tb = b, };
 333
 334         smp_call_function_single(b->cpu, local_error_count_handler, &tbcc, 1);
 335         return sprintf(buf, "%lx\n", tbcc.retval);
 336 }
 337
 338 static ssize_t store_error_count(struct threshold_block *b,
 339                                  const char *buf, size_t count)
 340 {
 341         struct thresh_restart tr = { .b = b, .reset = 1, .old_limit = 0 };
 342
 343         smp_call_function_single(b->cpu, threshold_restart_bank, &tr, 1);
 344         return 1;
 345 }
 346
 347 #define RW_ATTR(val)                                                    \
 348 static struct threshold_attr val = {                                    \
 349         .attr   = {.name = __stringify(val), .mode = 0644 },            \
 350         .show   = show_## val,                                          \
 351         .store  = store_## val,                                         \
 352 };
 353
 354 RW_ATTR(interrupt_enable);
 355 RW_ATTR(threshold_limit);
 356 RW_ATTR(error_count);
 357
 358 static struct attribute *default_attrs[] = {
 359         &interrupt_enable.attr,
 360         &threshold_limit.attr,
 361         &error_count.attr,
 362         NULL
 363 };
 364
 365 #define to_block(k)     container_of(k, struct threshold_block, kobj)
 366 #define to_attr(a)      container_of(a, struct threshold_attr, attr)
 367
 368 static ssize_t show(struct kobject *kobj, struct attribute *attr, char *buf)
 369 {
 370         struct threshold_block *b = to_block(kobj);
 371         struct threshold_attr *a = to_attr(attr);
 372         ssize_t ret;
 373
 374         ret = a->show ? a->show(b, buf) : -EIO;
 375
 376         return ret;
 377 }
 378
 379 static ssize_t store(struct kobject *kobj, struct attribute *attr,
 380                      const char *buf, size_t count)
 381 {
 382         struct threshold_block *b = to_block(kobj);
 383         struct threshold_attr *a = to_attr(attr);
 384         ssize_t ret;
 385
 386         ret = a->store ? a->store(b, buf, count) : -EIO;
 387
 388         return ret;
 389 }
 390
 391 static const struct sysfs_ops threshold_ops = {
 392         .show                   = show,
 393         .store                  = store,
 394 };
 395
 396 static struct kobj_type threshold_ktype = {
 397         .sysfs_ops              = &threshold_ops,
 398         .default_attrs          = default_attrs,
 399 };
 400
 401 static __cpuinit int allocate_threshold_blocks(unsigned int cpu,
 402                                                unsigned int bank,
 403                                                unsigned int block,
 404                                                u32 address)
 405 {
 406         struct threshold_block *b = NULL;
 407         u32 low, high;
 408         int err;
 409
 410         if ((bank >= NR_BANKS) || (block >= NR_BLOCKS))
 411                 return 0;
 412
 413         if (rdmsr_safe_on_cpu(cpu, address, &low, &high))
 414                 return 0;
 415
 416         if (!(high & MASK_VALID_HI)) {
 417                 if (block)
 418                         goto recurse;
 419                 else
 420                         return 0;
 421         }
 422
 423         if (!(high & MASK_CNTP_HI)  ||
 424              (high & MASK_LOCKED_HI))
 425                 goto recurse;
 426
 427         b = kzalloc(sizeof(struct threshold_block), GFP_KERNEL);
 428         if (!b)
 429                 return -ENOMEM;
 430
 431         b->block                = block;
 432         b->bank                 = bank;
 433         b->cpu                  = cpu;
 434         b->address              = address;
 435         b->interrupt_enable     = 0;
 436         b->threshold_limit      = THRESHOLD_MAX;
 437
 438         INIT_LIST_HEAD(&b->miscj);
 439
 440         if (per_cpu(threshold_banks, cpu)[bank]->blocks) {
 441                 list_add(&b->miscj,
 442                          &per_cpu(threshold_banks, cpu)[bank]->blocks->miscj);
 443         } else {
 444                 per_cpu(threshold_banks, cpu)[bank]->blocks = b;
 445         }
 446
 447         err = kobject_init_and_add(&b->kobj, &threshold_ktype,
 448                                    per_cpu(threshold_banks, cpu)[bank]->kobj,
 449                                    "misc%i", block);
 450         if (err)
 451                 goto out_free;
 452 recurse:
 453         if (!block) {
 454                 address = (low & MASK_BLKPTR_LO) >> 21;
 455                 if (!address)
 456                         return 0;
 457                 address += MCG_XBLK_ADDR;
 458         } else {
 459                 ++address;
 460         }
 461
 462         err = allocate_threshold_blocks(cpu, bank, ++block, address);
 463         if (err)
 464                 goto out_free;
 465
 466         if (b)
 467                 kobject_uevent(&b->kobj, KOBJ_ADD);
 468
 469         return err;
 470
 471 out_free:
 472         if (b) {
 473                 kobject_put(&b->kobj);
 474                 kfree(b);
 475         }
 476         return err;
 477 }
 478
 479 static __cpuinit long
 480 local_allocate_threshold_blocks(int cpu, unsigned int bank)
 481 {
 482         return allocate_threshold_blocks(cpu, bank, 0,
 483                                          MSR_IA32_MC0_MISC + bank * 4);
 484 }
 485
 486 /* symlinks sibling shared banks to first core.  first core owns dir/files. */
 487 static __cpuinit int threshold_create_bank(unsigned int cpu, unsigned int bank)
 488 {
 489         int i, err = 0;
 490         struct threshold_bank *b = NULL;
 491         char name[32];
 492 #ifdef CONFIG_SMP
 493         struct cpuinfo_x86 *c = &cpu_data(cpu);
 494 #endif
 495
 496         sprintf(name, "threshold_bank%i", bank);
 497
 498 #ifdef CONFIG_SMP
 499         if (cpu_data(cpu).cpu_core_id && shared_bank[bank]) {   /* symlink */
 500                 i = cpumask_first(c->llc_shared_map);
 501
 502                 /* first core not up yet */
 503                 if (cpu_data(i).cpu_core_id)
 504                         goto out;
 505
 506                 /* already linked */
 507                 if (per_cpu(threshold_banks, cpu)[bank])
 508                         goto out;
 509
 510                 b = per_cpu(threshold_banks, i)[bank];
 511
 512                 if (!b)
 513                         goto out;
 514
 515                 err = sysfs_create_link(&per_cpu(mce_dev, cpu).kobj,
 516                                         b->kobj, name);
 517                 if (err)
 518                         goto out;
 519
 520                 cpumask_copy(b->cpus, c->llc_shared_map);
 521                 per_cpu(threshold_banks, cpu)[bank] = b;
 522
 523                 goto out;
 524         }
 525 #endif
 526
 527         b = kzalloc(sizeof(struct threshold_bank), GFP_KERNEL);
 528         if (!b) {
 529                 err = -ENOMEM;
 530                 goto out;
 531         }
 532         if (!alloc_cpumask_var(&b->cpus, GFP_KERNEL)) {
 533                 kfree(b);
 534                 err = -ENOMEM;
 535                 goto out;
 536         }
 537
 538         b->kobj = kobject_create_and_add(name, &per_cpu(mce_dev, cpu).kobj);
 539         if (!b->kobj)
 540                 goto out_free;
 541
 542 #ifndef CONFIG_SMP
 543         cpumask_setall(b->cpus);
 544 #else
 545         cpumask_copy(b->cpus, c->llc_shared_map);
 546 #endif
 547
 548         per_cpu(threshold_banks, cpu)[bank] = b;
 549
 550         err = local_allocate_threshold_blocks(cpu, bank);
 551         if (err)
 552                 goto out_free;
 553
 554         for_each_cpu(i, b->cpus) {
 555                 if (i == cpu)
 556                         continue;
 557
 558                 err = sysfs_create_link(&per_cpu(mce_dev, i).kobj,
 559                                         b->kobj, name);
 560                 if (err)
 561                         goto out;
 562
 563                 per_cpu(threshold_banks, i)[bank] = b;
 564         }
 565
 566         goto out;
 567
 568 out_free:
 569         per_cpu(threshold_banks, cpu)[bank] = NULL;
 570         free_cpumask_var(b->cpus);
 571         kfree(b);
 572 out:
 573         return err;
 574 }
 575
 576 /* create dir/files for all valid threshold banks */
 577 static __cpuinit int threshold_create_device(unsigned int cpu)
 578 {
 579         unsigned int bank;
 580         int err = 0;
 581
 582         for (bank = 0; bank < NR_BANKS; ++bank) {
 583                 if (!(per_cpu(bank_map, cpu) & (1 << bank)))
 584                         continue;
 585                 err = threshold_create_bank(cpu, bank);
 586                 if (err)
 587                         goto out;
 588         }
 589 out:
 590         return err;
 591 }
 592
 593 /*
 594  * let's be hotplug friendly.
 595  * in case of multiple core processors, the first core always takes ownership
 596  *   of shared sysfs dir/files, and rest of the cores will be symlinked to it.
 597  */
 598
 599 static void deallocate_threshold_block(unsigned int cpu,
 600                                                  unsigned int bank)
 601 {
 602         struct threshold_block *pos = NULL;
 603         struct threshold_block *tmp = NULL;
 604         struct threshold_bank *head = per_cpu(threshold_banks, cpu)[bank];
 605
 606         if (!head)
 607                 return;
 608
 609         list_for_each_entry_safe(pos, tmp, &head->blocks->miscj, miscj) {
 610                 kobject_put(&pos->kobj);
 611                 list_del(&pos->miscj);
 612                 kfree(pos);
 613         }
 614
 615         kfree(per_cpu(threshold_banks, cpu)[bank]->blocks);
 616         per_cpu(threshold_banks, cpu)[bank]->blocks = NULL;
 617 }
 618
 619 static void threshold_remove_bank(unsigned int cpu, int bank)
 620 {
 621         struct threshold_bank *b;
 622         char name[32];
 623         int i = 0;
 624
 625         b = per_cpu(threshold_banks, cpu)[bank];
 626         if (!b)
 627                 return;
 628         if (!b->blocks)
 629                 goto free_out;
 630
 631         sprintf(name, "threshold_bank%i", bank);
 632
 633 #ifdef CONFIG_SMP
 634         /* sibling symlink */
 635         if (shared_bank[bank] && b->blocks->cpu != cpu) {
 636                 sysfs_remove_link(&per_cpu(mce_dev, cpu).kobj, name);
 637                 per_cpu(threshold_banks, cpu)[bank] = NULL;
 638
 639                 return;
 640         }
 641 #endif
 642
 643         /* remove all sibling symlinks before unregistering */
 644         for_each_cpu(i, b->cpus) {
 645                 if (i == cpu)
 646                         continue;
 647
 648                 sysfs_remove_link(&per_cpu(mce_dev, i).kobj, name);
 649                 per_cpu(threshold_banks, i)[bank] = NULL;
 650         }
 651
 652         deallocate_threshold_block(cpu, bank);
 653
 654 free_out:
 655         kobject_del(b->kobj);
 656         kobject_put(b->kobj);
 657         free_cpumask_var(b->cpus);
 658         kfree(b);
 659         per_cpu(threshold_banks, cpu)[bank] = NULL;
 660 }
 661
 662 static void threshold_remove_device(unsigned int cpu)
 663 {
 664         unsigned int bank;
 665
 666         for (bank = 0; bank < NR_BANKS; ++bank) {
 667                 if (!(per_cpu(bank_map, cpu) & (1 << bank)))
 668                         continue;
 669                 threshold_remove_bank(cpu, bank);
 670         }
 671 }
 672
 673 /* get notified when a cpu comes on/off */
 674 static void __cpuinit
 675 amd_64_threshold_cpu_callback(unsigned long action, unsigned int cpu)
 676 {
 677         switch (action) {
 678         case CPU_ONLINE:
 679         case CPU_ONLINE_FROZEN:
 680                 threshold_create_device(cpu);
 681                 break;
 682         case CPU_DEAD:
 683         case CPU_DEAD_FROZEN:
 684                 threshold_remove_device(cpu);
 685                 break;
 686         default:
 687                 break;
 688         }
 689 }
 690
 691 static __init int threshold_init_device(void)
 692 {
 693         unsigned lcpu = 0;
 694
 695         /* to hit CPUs online before the notifier is up */
 696         for_each_online_cpu(lcpu) {
 697                 int err = threshold_create_device(lcpu);
 698
 699                 if (err)
 700                         return err;
 701         }
 702         threshold_cpu_callback = amd_64_threshold_cpu_callback;
 703
 704         return 0;
 705 }
 706 device_initcall(threshold_init_device);