arch/x86/kernel/cpu/mce/amd.c

   1 /*
   2  *  (c) 2005-2016 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  *  Maintained by: Borislav Petkov <bp@alien8.de>
   9  *
  10  *  All MC4_MISCi registers are shared between cores on a node.
  11  */
  12 #include <linux/interrupt.h>
  13 #include <linux/notifier.h>
  14 #include <linux/kobject.h>
  15 #include <linux/percpu.h>
  16 #include <linux/errno.h>
  17 #include <linux/sched.h>
  18 #include <linux/sysfs.h>
  19 #include <linux/slab.h>
  20 #include <linux/init.h>
  21 #include <linux/cpu.h>
  22 #include <linux/smp.h>
  23 #include <linux/string.h>
  24
  25 #include <asm/amd_nb.h>
  26 #include <asm/traps.h>
  27 #include <asm/apic.h>
  28 #include <asm/mce.h>
  29 #include <asm/msr.h>
  30 #include <asm/trace/irq_vectors.h>
  31
  32 #include "internal.h"
  33
  34 #define NR_BLOCKS         5
  35 #define THRESHOLD_MAX     0xFFF
  36 #define INT_TYPE_APIC     0x00020000
  37 #define MASK_VALID_HI     0x80000000
  38 #define MASK_CNTP_HI      0x40000000
  39 #define MASK_LOCKED_HI    0x20000000
  40 #define MASK_LVTOFF_HI    0x00F00000
  41 #define MASK_COUNT_EN_HI  0x00080000
  42 #define MASK_INT_TYPE_HI  0x00060000
  43 #define MASK_OVERFLOW_HI  0x00010000
  44 #define MASK_ERR_COUNT_HI 0x00000FFF
  45 #define MASK_BLKPTR_LO    0xFF000000
  46 #define MCG_XBLK_ADDR     0xC0000400
  47
  48 /* Deferred error settings */
  49 #define MSR_CU_DEF_ERR          0xC0000410
  50 #define MASK_DEF_LVTOFF         0x000000F0
  51 #define MASK_DEF_INT_TYPE       0x00000006
  52 #define DEF_LVT_OFF             0x2
  53 #define DEF_INT_TYPE_APIC       0x2
  54
  55 /* Scalable MCA: */
  56
  57 /* Threshold LVT offset is at MSR0xC0000410[15:12] */
  58 #define SMCA_THR_LVT_OFF        0xF000
  59
  60 static bool thresholding_irq_en;
  61
  62 static const char * const th_names[] = {
  63         "load_store",
  64         "insn_fetch",
  65         "combined_unit",
  66         "decode_unit",
  67         "northbridge",
  68         "execution_unit",
  69 };
  70
  71 static const char * const smca_umc_block_names[] = {
  72         "dram_ecc",
  73         "misc_umc"
  74 };
  75
  76 struct smca_bank_name {
  77         const char *name;       /* Short name for sysfs */
  78         const char *long_name;  /* Long name for pretty-printing */
  79 };
  80
  81 static struct smca_bank_name smca_names[] = {
  82         [SMCA_LS]       = { "load_store",       "Load Store Unit" },
  83         [SMCA_IF]       = { "insn_fetch",       "Instruction Fetch Unit" },
  84         [SMCA_L2_CACHE] = { "l2_cache",         "L2 Cache" },
  85         [SMCA_DE]       = { "decode_unit",      "Decode Unit" },
  86         [SMCA_RESERVED] = { "reserved",         "Reserved" },
  87         [SMCA_EX]       = { "execution_unit",   "Execution Unit" },
  88         [SMCA_FP]       = { "floating_point",   "Floating Point Unit" },
  89         [SMCA_L3_CACHE] = { "l3_cache",         "L3 Cache" },
  90         [SMCA_CS]       = { "coherent_slave",   "Coherent Slave" },
  91         [SMCA_CS_V2]    = { "coherent_slave",   "Coherent Slave" },
  92         [SMCA_PIE]      = { "pie",              "Power, Interrupts, etc." },
  93         [SMCA_UMC]      = { "umc",              "Unified Memory Controller" },
  94         [SMCA_PB]       = { "param_block",      "Parameter Block" },
  95         [SMCA_PSP]      = { "psp",              "Platform Security Processor" },
  96         [SMCA_PSP_V2]   = { "psp",              "Platform Security Processor" },
  97         [SMCA_SMU]      = { "smu",              "System Management Unit" },
  98         [SMCA_SMU_V2]   = { "smu",              "System Management Unit" },
  99         [SMCA_MP5]      = { "mp5",              "Microprocessor 5 Unit" },
 100         [SMCA_NBIO]     = { "nbio",             "Northbridge IO Unit" },
 101         [SMCA_PCIE]     = { "pcie",             "PCI Express Unit" },
 102 };
 103
 104 static u32 smca_bank_addrs[MAX_NR_BANKS][NR_BLOCKS] __ro_after_init =
 105 {
 106         [0 ... MAX_NR_BANKS - 1] = { [0 ... NR_BLOCKS - 1] = -1 }
 107 };
 108
 109 static const char *smca_get_name(enum smca_bank_types t)
 110 {
 111         if (t >= N_SMCA_BANK_TYPES)
 112                 return NULL;
 113
 114         return smca_names[t].name;
 115 }
 116
 117 const char *smca_get_long_name(enum smca_bank_types t)
 118 {
 119         if (t >= N_SMCA_BANK_TYPES)
 120                 return NULL;
 121
 122         return smca_names[t].long_name;
 123 }
 124 EXPORT_SYMBOL_GPL(smca_get_long_name);
 125
 126 static enum smca_bank_types smca_get_bank_type(unsigned int bank)
 127 {
 128         struct smca_bank *b;
 129
 130         if (bank >= MAX_NR_BANKS)
 131                 return N_SMCA_BANK_TYPES;
 132
 133         b = &smca_banks[bank];
 134         if (!b->hwid)
 135                 return N_SMCA_BANK_TYPES;
 136
 137         return b->hwid->bank_type;
 138 }
 139
 140 static struct smca_hwid smca_hwid_mcatypes[] = {
 141         /* { bank_type, hwid_mcatype, xec_bitmap } */
 142
 143         /* Reserved type */
 144         { SMCA_RESERVED, HWID_MCATYPE(0x00, 0x0), 0x0 },
 145
 146         /* ZN Core (HWID=0xB0) MCA types */
 147         { SMCA_LS,       HWID_MCATYPE(0xB0, 0x0), 0x1FFFFF },
 148         { SMCA_IF,       HWID_MCATYPE(0xB0, 0x1), 0x3FFF },
 149         { SMCA_L2_CACHE, HWID_MCATYPE(0xB0, 0x2), 0xF },
 150         { SMCA_DE,       HWID_MCATYPE(0xB0, 0x3), 0x1FF },
 151         /* HWID 0xB0 MCATYPE 0x4 is Reserved */
 152         { SMCA_EX,       HWID_MCATYPE(0xB0, 0x5), 0xFFF },
 153         { SMCA_FP,       HWID_MCATYPE(0xB0, 0x6), 0x7F },
 154         { SMCA_L3_CACHE, HWID_MCATYPE(0xB0, 0x7), 0xFF },
 155
 156         /* Data Fabric MCA types */
 157         { SMCA_CS,       HWID_MCATYPE(0x2E, 0x0), 0x1FF },
 158         { SMCA_PIE,      HWID_MCATYPE(0x2E, 0x1), 0x1F },
 159         { SMCA_CS_V2,    HWID_MCATYPE(0x2E, 0x2), 0x3FFF },
 160
 161         /* Unified Memory Controller MCA type */
 162         { SMCA_UMC,      HWID_MCATYPE(0x96, 0x0), 0xFF },
 163
 164         /* Parameter Block MCA type */
 165         { SMCA_PB,       HWID_MCATYPE(0x05, 0x0), 0x1 },
 166
 167         /* Platform Security Processor MCA type */
 168         { SMCA_PSP,      HWID_MCATYPE(0xFF, 0x0), 0x1 },
 169         { SMCA_PSP_V2,   HWID_MCATYPE(0xFF, 0x1), 0x3FFFF },
 170
 171         /* System Management Unit MCA type */
 172         { SMCA_SMU,      HWID_MCATYPE(0x01, 0x0), 0x1 },
 173         { SMCA_SMU_V2,   HWID_MCATYPE(0x01, 0x1), 0x7FF },
 174
 175         /* Microprocessor 5 Unit MCA type */
 176         { SMCA_MP5,      HWID_MCATYPE(0x01, 0x2), 0x3FF },
 177
 178         /* Northbridge IO Unit MCA type */
 179         { SMCA_NBIO,     HWID_MCATYPE(0x18, 0x0), 0x1F },
 180
 181         /* PCI Express Unit MCA type */
 182         { SMCA_PCIE,     HWID_MCATYPE(0x46, 0x0), 0x1F },
 183 };
 184
 185 struct smca_bank smca_banks[MAX_NR_BANKS];
 186 EXPORT_SYMBOL_GPL(smca_banks);
 187
 188 /*
 189  * In SMCA enabled processors, we can have multiple banks for a given IP type.
 190  * So to define a unique name for each bank, we use a temp c-string to append
 191  * the MCA_IPID[InstanceId] to type's name in get_name().
 192  *
 193  * InstanceId is 32 bits which is 8 characters. Make sure MAX_MCATYPE_NAME_LEN
 194  * is greater than 8 plus 1 (for underscore) plus length of longest type name.
 195  */
 196 #define MAX_MCATYPE_NAME_LEN    30
 197 static char buf_mcatype[MAX_MCATYPE_NAME_LEN];
 198
 199 static DEFINE_PER_CPU(struct threshold_bank **, threshold_banks);
 200 static DEFINE_PER_CPU(unsigned int, bank_map);  /* see which banks are on */
 201
 202 static void amd_threshold_interrupt(void);
 203 static void amd_deferred_error_interrupt(void);
 204
 205 static void default_deferred_error_interrupt(void)
 206 {
 207         pr_err("Unexpected deferred interrupt at vector %x\n", DEFERRED_ERROR_VECTOR);
 208 }
 209 void (*deferred_error_int_vector)(void) = default_deferred_error_interrupt;
 210
 211 static void smca_configure(unsigned int bank, unsigned int cpu)
 212 {
 213         unsigned int i, hwid_mcatype;
 214         struct smca_hwid *s_hwid;
 215         u32 high, low;
 216         u32 smca_config = MSR_AMD64_SMCA_MCx_CONFIG(bank);
 217
 218         /* Set appropriate bits in MCA_CONFIG */
 219         if (!rdmsr_safe(smca_config, &low, &high)) {
 220                 /*
 221                  * OS is required to set the MCAX bit to acknowledge that it is
 222                  * now using the new MSR ranges and new registers under each
 223                  * bank. It also means that the OS will configure deferred
 224                  * errors in the new MCx_CONFIG register. If the bit is not set,
 225                  * uncorrectable errors will cause a system panic.
 226                  *
 227                  * MCA_CONFIG[MCAX] is bit 32 (0 in the high portion of the MSR.)
 228                  */
 229                 high |= BIT(0);
 230
 231                 /*
 232                  * SMCA sets the Deferred Error Interrupt type per bank.
 233                  *
 234                  * MCA_CONFIG[DeferredIntTypeSupported] is bit 5, and tells us
 235                  * if the DeferredIntType bit field is available.
 236                  *
 237                  * MCA_CONFIG[DeferredIntType] is bits [38:37] ([6:5] in the
 238                  * high portion of the MSR). OS should set this to 0x1 to enable
 239                  * APIC based interrupt. First, check that no interrupt has been
 240                  * set.
 241                  */
 242                 if ((low & BIT(5)) && !((high >> 5) & 0x3))
 243                         high |= BIT(5);
 244
 245                 wrmsr(smca_config, low, high);
 246         }
 247
 248         /* Return early if this bank was already initialized. */
 249         if (smca_banks[bank].hwid)
 250                 return;
 251
 252         if (rdmsr_safe_on_cpu(cpu, MSR_AMD64_SMCA_MCx_IPID(bank), &low, &high)) {
 253                 pr_warn("Failed to read MCA_IPID for bank %d\n", bank);
 254                 return;
 255         }
 256
 257         hwid_mcatype = HWID_MCATYPE(high & MCI_IPID_HWID,
 258                                     (high & MCI_IPID_MCATYPE) >> 16);
 259
 260         for (i = 0; i < ARRAY_SIZE(smca_hwid_mcatypes); i++) {
 261                 s_hwid = &smca_hwid_mcatypes[i];
 262                 if (hwid_mcatype == s_hwid->hwid_mcatype) {
 263                         smca_banks[bank].hwid = s_hwid;
 264                         smca_banks[bank].id = low;
 265                         smca_banks[bank].sysfs_id = s_hwid->count++;
 266                         break;
 267                 }
 268         }
 269 }
 270
 271 struct thresh_restart {
 272         struct threshold_block  *b;
 273         int                     reset;
 274         int                     set_lvt_off;
 275         int                     lvt_off;
 276         u16                     old_limit;
 277 };
 278
 279 static inline bool is_shared_bank(int bank)
 280 {
 281         /*
 282          * Scalable MCA provides for only one core to have access to the MSRs of
 283          * a shared bank.
 284          */
 285         if (mce_flags.smca)
 286                 return false;
 287
 288         /* Bank 4 is for northbridge reporting and is thus shared */
 289         return (bank == 4);
 290 }
 291
 292 static const char *bank4_names(const struct threshold_block *b)
 293 {
 294         switch (b->address) {
 295         /* MSR4_MISC0 */
 296         case 0x00000413:
 297                 return "dram";
 298
 299         case 0xc0000408:
 300                 return "ht_links";
 301
 302         case 0xc0000409:
 303                 return "l3_cache";
 304
 305         default:
 306                 WARN(1, "Funny MSR: 0x%08x\n", b->address);
 307                 return "";
 308         }
 309 };
 310
 311
 312 static bool lvt_interrupt_supported(unsigned int bank, u32 msr_high_bits)
 313 {
 314         /*
 315          * bank 4 supports APIC LVT interrupts implicitly since forever.
 316          */
 317         if (bank == 4)
 318                 return true;
 319
 320         /*
 321          * IntP: interrupt present; if this bit is set, the thresholding
 322          * bank can generate APIC LVT interrupts
 323          */
 324         return msr_high_bits & BIT(28);
 325 }
 326
 327 static int lvt_off_valid(struct threshold_block *b, int apic, u32 lo, u32 hi)
 328 {
 329         int msr = (hi & MASK_LVTOFF_HI) >> 20;
 330
 331         if (apic < 0) {
 332                 pr_err(FW_BUG "cpu %d, failed to setup threshold interrupt "
 333                        "for bank %d, block %d (MSR%08X=0x%x%08x)\n", b->cpu,
 334                        b->bank, b->block, b->address, hi, lo);
 335                 return 0;
 336         }
 337
 338         if (apic != msr) {
 339                 /*
 340                  * On SMCA CPUs, LVT offset is programmed at a different MSR, and
 341                  * the BIOS provides the value. The original field where LVT offset
 342                  * was set is reserved. Return early here:
 343                  */
 344                 if (mce_flags.smca)
 345                         return 0;
 346
 347                 pr_err(FW_BUG "cpu %d, invalid threshold interrupt offset %d "
 348                        "for bank %d, block %d (MSR%08X=0x%x%08x)\n",
 349                        b->cpu, apic, b->bank, b->block, b->address, hi, lo);
 350                 return 0;
 351         }
 352
 353         return 1;
 354 };
 355
 356 /* Reprogram MCx_MISC MSR behind this threshold bank. */
 357 static void threshold_restart_bank(void *_tr)
 358 {
 359         struct thresh_restart *tr = _tr;
 360         u32 hi, lo;
 361
 362         rdmsr(tr->b->address, lo, hi);
 363
 364         if (tr->b->threshold_limit < (hi & THRESHOLD_MAX))
 365                 tr->reset = 1;  /* limit cannot be lower than err count */
 366
 367         if (tr->reset) {                /* reset err count and overflow bit */
 368                 hi =
 369                     (hi & ~(MASK_ERR_COUNT_HI | MASK_OVERFLOW_HI)) |
 370                     (THRESHOLD_MAX - tr->b->threshold_limit);
 371         } else if (tr->old_limit) {     /* change limit w/o reset */
 372                 int new_count = (hi & THRESHOLD_MAX) +
 373                     (tr->old_limit - tr->b->threshold_limit);
 374
 375                 hi = (hi & ~MASK_ERR_COUNT_HI) |
 376                     (new_count & THRESHOLD_MAX);
 377         }
 378
 379         /* clear IntType */
 380         hi &= ~MASK_INT_TYPE_HI;
 381
 382         if (!tr->b->interrupt_capable)
 383                 goto done;
 384
 385         if (tr->set_lvt_off) {
 386                 if (lvt_off_valid(tr->b, tr->lvt_off, lo, hi)) {
 387                         /* set new lvt offset */
 388                         hi &= ~MASK_LVTOFF_HI;
 389                         hi |= tr->lvt_off << 20;
 390                 }
 391         }
 392
 393         if (tr->b->interrupt_enable)
 394                 hi |= INT_TYPE_APIC;
 395
 396  done:
 397
 398         hi |= MASK_COUNT_EN_HI;
 399         wrmsr(tr->b->address, lo, hi);
 400 }
 401
 402 static void mce_threshold_block_init(struct threshold_block *b, int offset)
 403 {
 404         struct thresh_restart tr = {
 405                 .b                      = b,
 406                 .set_lvt_off            = 1,
 407                 .lvt_off                = offset,
 408         };
 409
 410         b->threshold_limit              = THRESHOLD_MAX;
 411         threshold_restart_bank(&tr);
 412 };
 413
 414 static int setup_APIC_mce_threshold(int reserved, int new)
 415 {
 416         if (reserved < 0 && !setup_APIC_eilvt(new, THRESHOLD_APIC_VECTOR,
 417                                               APIC_EILVT_MSG_FIX, 0))
 418                 return new;
 419
 420         return reserved;
 421 }
 422
 423 static int setup_APIC_deferred_error(int reserved, int new)
 424 {
 425         if (reserved < 0 && !setup_APIC_eilvt(new, DEFERRED_ERROR_VECTOR,
 426                                               APIC_EILVT_MSG_FIX, 0))
 427                 return new;
 428
 429         return reserved;
 430 }
 431
 432 static void deferred_error_interrupt_enable(struct cpuinfo_x86 *c)
 433 {
 434         u32 low = 0, high = 0;
 435         int def_offset = -1, def_new;
 436
 437         if (rdmsr_safe(MSR_CU_DEF_ERR, &low, &high))
 438                 return;
 439
 440         def_new = (low & MASK_DEF_LVTOFF) >> 4;
 441         if (!(low & MASK_DEF_LVTOFF)) {
 442                 pr_err(FW_BUG "Your BIOS is not setting up LVT offset 0x2 for deferred error IRQs correctly.\n");
 443                 def_new = DEF_LVT_OFF;
 444                 low = (low & ~MASK_DEF_LVTOFF) | (DEF_LVT_OFF << 4);
 445         }
 446
 447         def_offset = setup_APIC_deferred_error(def_offset, def_new);
 448         if ((def_offset == def_new) &&
 449             (deferred_error_int_vector != amd_deferred_error_interrupt))
 450                 deferred_error_int_vector = amd_deferred_error_interrupt;
 451
 452         if (!mce_flags.smca)
 453                 low = (low & ~MASK_DEF_INT_TYPE) | DEF_INT_TYPE_APIC;
 454
 455         wrmsr(MSR_CU_DEF_ERR, low, high);
 456 }
 457
 458 static u32 smca_get_block_address(unsigned int bank, unsigned int block)
 459 {
 460         u32 low, high;
 461         u32 addr = 0;
 462
 463         if (smca_get_bank_type(bank) == SMCA_RESERVED)
 464                 return addr;
 465
 466         if (!block)
 467                 return MSR_AMD64_SMCA_MCx_MISC(bank);
 468
 469         /* Check our cache first: */
 470         if (smca_bank_addrs[bank][block] != -1)
 471                 return smca_bank_addrs[bank][block];
 472
 473         /*
 474          * For SMCA enabled processors, BLKPTR field of the first MISC register
 475          * (MCx_MISC0) indicates presence of additional MISC regs set (MISC1-4).
 476          */
 477         if (rdmsr_safe(MSR_AMD64_SMCA_MCx_CONFIG(bank), &low, &high))
 478                 goto out;
 479
 480         if (!(low & MCI_CONFIG_MCAX))
 481                 goto out;
 482
 483         if (!rdmsr_safe(MSR_AMD64_SMCA_MCx_MISC(bank), &low, &high) &&
 484             (low & MASK_BLKPTR_LO))
 485                 addr = MSR_AMD64_SMCA_MCx_MISCy(bank, block - 1);
 486
 487 out:
 488         smca_bank_addrs[bank][block] = addr;
 489         return addr;
 490 }
 491
 492 static u32 get_block_address(u32 current_addr, u32 low, u32 high,
 493                              unsigned int bank, unsigned int block)
 494 {
 495         u32 addr = 0, offset = 0;
 496
 497         if ((bank >= mca_cfg.banks) || (block >= NR_BLOCKS))
 498                 return addr;
 499
 500         if (mce_flags.smca)
 501                 return smca_get_block_address(bank, block);
 502
 503         /* Fall back to method we used for older processors: */
 504         switch (block) {
 505         case 0:
 506                 addr = msr_ops.misc(bank);
 507                 break;
 508         case 1:
 509                 offset = ((low & MASK_BLKPTR_LO) >> 21);
 510                 if (offset)
 511                         addr = MCG_XBLK_ADDR + offset;
 512                 break;
 513         default:
 514                 addr = ++current_addr;
 515         }
 516         return addr;
 517 }
 518
 519 static int
 520 prepare_threshold_block(unsigned int bank, unsigned int block, u32 addr,
 521                         int offset, u32 misc_high)
 522 {
 523         unsigned int cpu = smp_processor_id();
 524         u32 smca_low, smca_high;
 525         struct threshold_block b;
 526         int new;
 527
 528         if (!block)
 529                 per_cpu(bank_map, cpu) |= (1 << bank);
 530
 531         memset(&b, 0, sizeof(b));
 532         b.cpu                   = cpu;
 533         b.bank                  = bank;
 534         b.block                 = block;
 535         b.address               = addr;
 536         b.interrupt_capable     = lvt_interrupt_supported(bank, misc_high);
 537
 538         if (!b.interrupt_capable)
 539                 goto done;
 540
 541         b.interrupt_enable = 1;
 542
 543         if (!mce_flags.smca) {
 544                 new = (misc_high & MASK_LVTOFF_HI) >> 20;
 545                 goto set_offset;
 546         }
 547
 548         /* Gather LVT offset for thresholding: */
 549         if (rdmsr_safe(MSR_CU_DEF_ERR, &smca_low, &smca_high))
 550                 goto out;
 551
 552         new = (smca_low & SMCA_THR_LVT_OFF) >> 12;
 553
 554 set_offset:
 555         offset = setup_APIC_mce_threshold(offset, new);
 556         if (offset == new)
 557                 thresholding_irq_en = true;
 558
 559 done:
 560         mce_threshold_block_init(&b, offset);
 561
 562 out:
 563         return offset;
 564 }
 565
 566 bool amd_filter_mce(struct mce *m)
 567 {
 568         enum smca_bank_types bank_type = smca_get_bank_type(m->bank);
 569         struct cpuinfo_x86 *c = &boot_cpu_data;
 570         u8 xec = (m->status >> 16) & 0x3F;
 571
 572         /* See Family 17h Models 10h-2Fh Erratum #1114. */
 573         if (c->x86 == 0x17 &&
 574             c->x86_model >= 0x10 && c->x86_model <= 0x2F &&
 575             bank_type == SMCA_IF && xec == 10)
 576                 return true;
 577
 578         return false;
 579 }
 580
 581 /*
 582  * Turn off thresholding banks for the following conditions:
 583  * - MC4_MISC thresholding is not supported on Family 0x15.
 584  * - Prevent possible spurious interrupts from the IF bank on Family 0x17
 585  *   Models 0x10-0x2F due to Erratum #1114.
 586  */
 587 void disable_err_thresholding(struct cpuinfo_x86 *c, unsigned int bank)
 588 {
 589         int i, num_msrs;
 590         u64 hwcr;
 591         bool need_toggle;
 592         u32 msrs[NR_BLOCKS];
 593
 594         if (c->x86 == 0x15 && bank == 4) {
 595                 msrs[0] = 0x00000413; /* MC4_MISC0 */
 596                 msrs[1] = 0xc0000408; /* MC4_MISC1 */
 597                 num_msrs = 2;
 598         } else if (c->x86 == 0x17 &&
 599                    (c->x86_model >= 0x10 && c->x86_model <= 0x2F)) {
 600
 601                 if (smca_get_bank_type(bank) != SMCA_IF)
 602                         return;
 603
 604                 msrs[0] = MSR_AMD64_SMCA_MCx_MISC(bank);
 605                 num_msrs = 1;
 606         } else {
 607                 return;
 608         }
 609
 610         rdmsrl(MSR_K7_HWCR, hwcr);
 611
 612         /* McStatusWrEn has to be set */
 613         need_toggle = !(hwcr & BIT(18));
 614         if (need_toggle)
 615                 wrmsrl(MSR_K7_HWCR, hwcr | BIT(18));
 616
 617         /* Clear CntP bit safely */
 618         for (i = 0; i < num_msrs; i++)
 619                 msr_clear_bit(msrs[i], 62);
 620
 621         /* restore old settings */
 622         if (need_toggle)
 623                 wrmsrl(MSR_K7_HWCR, hwcr);
 624 }
 625
 626 /* cpu init entry point, called from mce.c with preempt off */
 627 void mce_amd_feature_init(struct cpuinfo_x86 *c)
 628 {
 629         u32 low = 0, high = 0, address = 0;
 630         unsigned int bank, block, cpu = smp_processor_id();
 631         int offset = -1;
 632
 633         for (bank = 0; bank < mca_cfg.banks; ++bank) {
 634                 if (mce_flags.smca)
 635                         smca_configure(bank, cpu);
 636
 637                 disable_err_thresholding(c, bank);
 638
 639                 for (block = 0; block < NR_BLOCKS; ++block) {
 640                         address = get_block_address(address, low, high, bank, block);
 641                         if (!address)
 642                                 break;
 643
 644                         if (rdmsr_safe(address, &low, &high))
 645                                 break;
 646
 647                         if (!(high & MASK_VALID_HI))
 648                                 continue;
 649
 650                         if (!(high & MASK_CNTP_HI)  ||
 651                              (high & MASK_LOCKED_HI))
 652                                 continue;
 653
 654                         offset = prepare_threshold_block(bank, block, address, offset, high);
 655                 }
 656         }
 657
 658         if (mce_flags.succor)
 659                 deferred_error_interrupt_enable(c);
 660 }
 661
 662 int umc_normaddr_to_sysaddr(u64 norm_addr, u16 nid, u8 umc, u64 *sys_addr)
 663 {
 664         u64 dram_base_addr, dram_limit_addr, dram_hole_base;
 665         /* We start from the normalized address */
 666         u64 ret_addr = norm_addr;
 667
 668         u32 tmp;
 669
 670         u8 die_id_shift, die_id_mask, socket_id_shift, socket_id_mask;
 671         u8 intlv_num_dies, intlv_num_chan, intlv_num_sockets;
 672         u8 intlv_addr_sel, intlv_addr_bit;
 673         u8 num_intlv_bits, hashed_bit;
 674         u8 lgcy_mmio_hole_en, base = 0;
 675         u8 cs_mask, cs_id = 0;
 676         bool hash_enabled = false;
 677
 678         /* Read D18F0x1B4 (DramOffset), check if base 1 is used. */
 679         if (amd_df_indirect_read(nid, 0, 0x1B4, umc, &tmp))
 680                 goto out_err;
 681
 682         /* Remove HiAddrOffset from normalized address, if enabled: */
 683         if (tmp & BIT(0)) {
 684                 u64 hi_addr_offset = (tmp & GENMASK_ULL(31, 20)) << 8;
 685
 686                 if (norm_addr >= hi_addr_offset) {
 687                         ret_addr -= hi_addr_offset;
 688                         base = 1;
 689                 }
 690         }
 691
 692         /* Read D18F0x110 (DramBaseAddress). */
 693         if (amd_df_indirect_read(nid, 0, 0x110 + (8 * base), umc, &tmp))
 694                 goto out_err;
 695
 696         /* Check if address range is valid. */
 697         if (!(tmp & BIT(0))) {
 698                 pr_err("%s: Invalid DramBaseAddress range: 0x%x.\n",
 699                         __func__, tmp);
 700                 goto out_err;
 701         }
 702
 703         lgcy_mmio_hole_en = tmp & BIT(1);
 704         intlv_num_chan    = (tmp >> 4) & 0xF;
 705         intlv_addr_sel    = (tmp >> 8) & 0x7;
 706         dram_base_addr    = (tmp & GENMASK_ULL(31, 12)) << 16;
 707
 708         /* {0, 1, 2, 3} map to address bits {8, 9, 10, 11} respectively */
 709         if (intlv_addr_sel > 3) {
 710                 pr_err("%s: Invalid interleave address select %d.\n",
 711                         __func__, intlv_addr_sel);
 712                 goto out_err;
 713         }
 714
 715         /* Read D18F0x114 (DramLimitAddress). */
 716         if (amd_df_indirect_read(nid, 0, 0x114 + (8 * base), umc, &tmp))
 717                 goto out_err;
 718
 719         intlv_num_sockets = (tmp >> 8) & 0x1;
 720         intlv_num_dies    = (tmp >> 10) & 0x3;
 721         dram_limit_addr   = ((tmp & GENMASK_ULL(31, 12)) << 16) | GENMASK_ULL(27, 0);
 722
 723         intlv_addr_bit = intlv_addr_sel + 8;
 724
 725         /* Re-use intlv_num_chan by setting it equal to log2(#channels) */
 726         switch (intlv_num_chan) {
 727         case 0: intlv_num_chan = 0; break;
 728         case 1: intlv_num_chan = 1; break;
 729         case 3: intlv_num_chan = 2; break;
 730         case 5: intlv_num_chan = 3; break;
 731         case 7: intlv_num_chan = 4; break;
 732
 733         case 8: intlv_num_chan = 1;
 734                 hash_enabled = true;
 735                 break;
 736         default:
 737                 pr_err("%s: Invalid number of interleaved channels %d.\n",
 738                         __func__, intlv_num_chan);
 739                 goto out_err;
 740         }
 741
 742         num_intlv_bits = intlv_num_chan;
 743
 744         if (intlv_num_dies > 2) {
 745                 pr_err("%s: Invalid number of interleaved nodes/dies %d.\n",
 746                         __func__, intlv_num_dies);
 747                 goto out_err;
 748         }
 749
 750         num_intlv_bits += intlv_num_dies;
 751
 752         /* Add a bit if sockets are interleaved. */
 753         num_intlv_bits += intlv_num_sockets;
 754
 755         /* Assert num_intlv_bits <= 4 */
 756         if (num_intlv_bits > 4) {
 757                 pr_err("%s: Invalid interleave bits %d.\n",
 758                         __func__, num_intlv_bits);
 759                 goto out_err;
 760         }
 761
 762         if (num_intlv_bits > 0) {
 763                 u64 temp_addr_x, temp_addr_i, temp_addr_y;
 764                 u8 die_id_bit, sock_id_bit, cs_fabric_id;
 765
 766                 /*
 767                  * Read FabricBlockInstanceInformation3_CS[BlockFabricID].
 768                  * This is the fabric id for this coherent slave. Use
 769                  * umc/channel# as instance id of the coherent slave
 770                  * for FICAA.
 771                  */
 772                 if (amd_df_indirect_read(nid, 0, 0x50, umc, &tmp))
 773                         goto out_err;
 774
 775                 cs_fabric_id = (tmp >> 8) & 0xFF;
 776                 die_id_bit   = 0;
 777
 778                 /* If interleaved over more than 1 channel: */
 779                 if (intlv_num_chan) {
 780                         die_id_bit = intlv_num_chan;
 781                         cs_mask    = (1 << die_id_bit) - 1;
 782                         cs_id      = cs_fabric_id & cs_mask;
 783                 }
 784
 785                 sock_id_bit = die_id_bit;
 786
 787                 /* Read D18F1x208 (SystemFabricIdMask). */
 788                 if (intlv_num_dies || intlv_num_sockets)
 789                         if (amd_df_indirect_read(nid, 1, 0x208, umc, &tmp))
 790                                 goto out_err;
 791
 792                 /* If interleaved over more than 1 die. */
 793                 if (intlv_num_dies) {
 794                         sock_id_bit  = die_id_bit + intlv_num_dies;
 795                         die_id_shift = (tmp >> 24) & 0xF;
 796                         die_id_mask  = (tmp >> 8) & 0xFF;
 797
 798                         cs_id |= ((cs_fabric_id & die_id_mask) >> die_id_shift) << die_id_bit;
 799                 }
 800
 801                 /* If interleaved over more than 1 socket. */
 802                 if (intlv_num_sockets) {
 803                         socket_id_shift = (tmp >> 28) & 0xF;
 804                         socket_id_mask  = (tmp >> 16) & 0xFF;
 805
 806                         cs_id |= ((cs_fabric_id & socket_id_mask) >> socket_id_shift) << sock_id_bit;
 807                 }
 808
 809                 /*
 810                  * The pre-interleaved address consists of XXXXXXIIIYYYYY
 811                  * where III is the ID for this CS, and XXXXXXYYYYY are the
 812                  * address bits from the post-interleaved address.
 813                  * "num_intlv_bits" has been calculated to tell us how many "I"
 814                  * bits there are. "intlv_addr_bit" tells us how many "Y" bits
 815                  * there are (where "I" starts).
 816                  */
 817                 temp_addr_y = ret_addr & GENMASK_ULL(intlv_addr_bit-1, 0);
 818                 temp_addr_i = (cs_id << intlv_addr_bit);
 819                 temp_addr_x = (ret_addr & GENMASK_ULL(63, intlv_addr_bit)) << num_intlv_bits;
 820                 ret_addr    = temp_addr_x | temp_addr_i | temp_addr_y;
 821         }
 822
 823         /* Add dram base address */
 824         ret_addr += dram_base_addr;
 825
 826         /* If legacy MMIO hole enabled */
 827         if (lgcy_mmio_hole_en) {
 828                 if (amd_df_indirect_read(nid, 0, 0x104, umc, &tmp))
 829                         goto out_err;
 830
 831                 dram_hole_base = tmp & GENMASK(31, 24);
 832                 if (ret_addr >= dram_hole_base)
 833                         ret_addr += (BIT_ULL(32) - dram_hole_base);
 834         }
 835
 836         if (hash_enabled) {
 837                 /* Save some parentheses and grab ls-bit at the end. */
 838                 hashed_bit =    (ret_addr >> 12) ^
 839                                 (ret_addr >> 18) ^
 840                                 (ret_addr >> 21) ^
 841                                 (ret_addr >> 30) ^
 842                                 cs_id;
 843
 844                 hashed_bit &= BIT(0);
 845
 846                 if (hashed_bit != ((ret_addr >> intlv_addr_bit) & BIT(0)))
 847                         ret_addr ^= BIT(intlv_addr_bit);
 848         }
 849
 850         /* Is calculated system address is above DRAM limit address? */
 851         if (ret_addr > dram_limit_addr)
 852                 goto out_err;
 853
 854         *sys_addr = ret_addr;
 855         return 0;
 856
 857 out_err:
 858         return -EINVAL;
 859 }
 860 EXPORT_SYMBOL_GPL(umc_normaddr_to_sysaddr);
 861
 862 bool amd_mce_is_memory_error(struct mce *m)
 863 {
 864         /* ErrCodeExt[20:16] */
 865         u8 xec = (m->status >> 16) & 0x1f;
 866
 867         if (mce_flags.smca)
 868                 return smca_get_bank_type(m->bank) == SMCA_UMC && xec == 0x0;
 869
 870         return m->bank == 4 && xec == 0x8;
 871 }
 872
 873 static void __log_error(unsigned int bank, u64 status, u64 addr, u64 misc)
 874 {
 875         struct mce m;
 876
 877         mce_setup(&m);
 878
 879         m.status = status;
 880         m.misc   = misc;
 881         m.bank   = bank;
 882         m.tsc    = rdtsc();
 883
 884         if (m.status & MCI_STATUS_ADDRV) {
 885                 m.addr = addr;
 886
 887                 /*
 888                  * Extract [55:<lsb>] where lsb is the least significant
 889                  * *valid* bit of the address bits.
 890                  */
 891                 if (mce_flags.smca) {
 892                         u8 lsb = (m.addr >> 56) & 0x3f;
 893
 894                         m.addr &= GENMASK_ULL(55, lsb);
 895                 }
 896         }
 897
 898         if (mce_flags.smca) {
 899                 rdmsrl(MSR_AMD64_SMCA_MCx_IPID(bank), m.ipid);
 900
 901                 if (m.status & MCI_STATUS_SYNDV)
 902                         rdmsrl(MSR_AMD64_SMCA_MCx_SYND(bank), m.synd);
 903         }
 904
 905         mce_log(&m);
 906 }
 907
 908 asmlinkage __visible void __irq_entry smp_deferred_error_interrupt(struct pt_regs *regs)
 909 {
 910         entering_irq();
 911         trace_deferred_error_apic_entry(DEFERRED_ERROR_VECTOR);
 912         inc_irq_stat(irq_deferred_error_count);
 913         deferred_error_int_vector();
 914         trace_deferred_error_apic_exit(DEFERRED_ERROR_VECTOR);
 915         exiting_ack_irq();
 916 }
 917
 918 /*
 919  * Returns true if the logged error is deferred. False, otherwise.
 920  */
 921 static inline bool
 922 _log_error_bank(unsigned int bank, u32 msr_stat, u32 msr_addr, u64 misc)
 923 {
 924         u64 status, addr = 0;
 925
 926         rdmsrl(msr_stat, status);
 927         if (!(status & MCI_STATUS_VAL))
 928                 return false;
 929
 930         if (status & MCI_STATUS_ADDRV)
 931                 rdmsrl(msr_addr, addr);
 932
 933         __log_error(bank, status, addr, misc);
 934
 935         wrmsrl(msr_stat, 0);
 936
 937         return status & MCI_STATUS_DEFERRED;
 938 }
 939
 940 /*
 941  * We have three scenarios for checking for Deferred errors:
 942  *
 943  * 1) Non-SMCA systems check MCA_STATUS and log error if found.
 944  * 2) SMCA systems check MCA_STATUS. If error is found then log it and also
 945  *    clear MCA_DESTAT.
 946  * 3) SMCA systems check MCA_DESTAT, if error was not found in MCA_STATUS, and
 947  *    log it.
 948  */
 949 static void log_error_deferred(unsigned int bank)
 950 {
 951         bool defrd;
 952
 953         defrd = _log_error_bank(bank, msr_ops.status(bank),
 954                                         msr_ops.addr(bank), 0);
 955
 956         if (!mce_flags.smca)
 957                 return;
 958
 959         /* Clear MCA_DESTAT if we logged the deferred error from MCA_STATUS. */
 960         if (defrd) {
 961                 wrmsrl(MSR_AMD64_SMCA_MCx_DESTAT(bank), 0);
 962                 return;
 963         }
 964
 965         /*
 966          * Only deferred errors are logged in MCA_DE{STAT,ADDR} so just check
 967          * for a valid error.
 968          */
 969         _log_error_bank(bank, MSR_AMD64_SMCA_MCx_DESTAT(bank),
 970                               MSR_AMD64_SMCA_MCx_DEADDR(bank), 0);
 971 }
 972
 973 /* APIC interrupt handler for deferred errors */
 974 static void amd_deferred_error_interrupt(void)
 975 {
 976         unsigned int bank;
 977
 978         for (bank = 0; bank < mca_cfg.banks; ++bank)
 979                 log_error_deferred(bank);
 980 }
 981
 982 static void log_error_thresholding(unsigned int bank, u64 misc)
 983 {
 984         _log_error_bank(bank, msr_ops.status(bank), msr_ops.addr(bank), misc);
 985 }
 986
 987 static void log_and_reset_block(struct threshold_block *block)
 988 {
 989         struct thresh_restart tr;
 990         u32 low = 0, high = 0;
 991
 992         if (!block)
 993                 return;
 994
 995         if (rdmsr_safe(block->address, &low, &high))
 996                 return;
 997
 998         if (!(high & MASK_OVERFLOW_HI))
 999                 return;
1000
1001         /* Log the MCE which caused the threshold event. */
1002         log_error_thresholding(block->bank, ((u64)high << 32) | low);
1003
1004         /* Reset threshold block after logging error. */
1005         memset(&tr, 0, sizeof(tr));
1006         tr.b = block;
1007         threshold_restart_bank(&tr);
1008 }
1009
1010 /*
1011  * Threshold interrupt handler will service THRESHOLD_APIC_VECTOR. The interrupt
1012  * goes off when error_count reaches threshold_limit.
1013  */
1014 static void amd_threshold_interrupt(void)
1015 {
1016         struct threshold_block *first_block = NULL, *block = NULL, *tmp = NULL;
1017         unsigned int bank, cpu = smp_processor_id();
1018
1019         for (bank = 0; bank < mca_cfg.banks; ++bank) {
1020                 if (!(per_cpu(bank_map, cpu) & (1 << bank)))
1021                         continue;
1022
1023                 first_block = per_cpu(threshold_banks, cpu)[bank]->blocks;
1024                 if (!first_block)
1025                         continue;
1026
1027                 /*
1028                  * The first block is also the head of the list. Check it first
1029                  * before iterating over the rest.
1030                  */
1031                 log_and_reset_block(first_block);
1032                 list_for_each_entry_safe(block, tmp, &first_block->miscj, miscj)
1033                         log_and_reset_block(block);
1034         }
1035 }
1036
1037 /*
1038  * Sysfs Interface
1039  */
1040
1041 struct threshold_attr {
1042         struct attribute attr;
1043         ssize_t (*show) (struct threshold_block *, char *);
1044         ssize_t (*store) (struct threshold_block *, const char *, size_t count);
1045 };
1046
1047 #define SHOW_FIELDS(name)                                               \
1048 static ssize_t show_ ## name(struct threshold_block *b, char *buf)      \
1049 {                                                                       \
1050         return sprintf(buf, "%lu\n", (unsigned long) b->name);          \
1051 }
1052 SHOW_FIELDS(interrupt_enable)
1053 SHOW_FIELDS(threshold_limit)
1054
1055 static ssize_t
1056 store_interrupt_enable(struct threshold_block *b, const char *buf, size_t size)
1057 {
1058         struct thresh_restart tr;
1059         unsigned long new;
1060
1061         if (!b->interrupt_capable)
1062                 return -EINVAL;
1063
1064         if (kstrtoul(buf, 0, &new) < 0)
1065                 return -EINVAL;
1066
1067         b->interrupt_enable = !!new;
1068
1069         memset(&tr, 0, sizeof(tr));
1070         tr.b            = b;
1071
1072         smp_call_function_single(b->cpu, threshold_restart_bank, &tr, 1);
1073
1074         return size;
1075 }
1076
1077 static ssize_t
1078 store_threshold_limit(struct threshold_block *b, const char *buf, size_t size)
1079 {
1080         struct thresh_restart tr;
1081         unsigned long new;
1082
1083         if (kstrtoul(buf, 0, &new) < 0)
1084                 return -EINVAL;
1085
1086         if (new > THRESHOLD_MAX)
1087                 new = THRESHOLD_MAX;
1088         if (new < 1)
1089                 new = 1;
1090
1091         memset(&tr, 0, sizeof(tr));
1092         tr.old_limit = b->threshold_limit;
1093         b->threshold_limit = new;
1094         tr.b = b;
1095
1096         smp_call_function_single(b->cpu, threshold_restart_bank, &tr, 1);
1097
1098         return size;
1099 }
1100
1101 static ssize_t show_error_count(struct threshold_block *b, char *buf)
1102 {
1103         u32 lo, hi;
1104
1105         rdmsr_on_cpu(b->cpu, b->address, &lo, &hi);
1106
1107         return sprintf(buf, "%u\n", ((hi & THRESHOLD_MAX) -
1108                                      (THRESHOLD_MAX - b->threshold_limit)));
1109 }
1110
1111 static struct threshold_attr error_count = {
1112         .attr = {.name = __stringify(error_count), .mode = 0444 },
1113         .show = show_error_count,
1114 };
1115
1116 #define RW_ATTR(val)                                                    \
1117 static struct threshold_attr val = {                                    \
1118         .attr   = {.name = __stringify(val), .mode = 0644 },            \
1119         .show   = show_## val,                                          \
1120         .store  = store_## val,                                         \
1121 };
1122
1123 RW_ATTR(interrupt_enable);
1124 RW_ATTR(threshold_limit);
1125
1126 static struct attribute *default_attrs[] = {
1127         &threshold_limit.attr,
1128         &error_count.attr,
1129         NULL,   /* possibly interrupt_enable if supported, see below */
1130         NULL,
1131 };
1132
1133 #define to_block(k)     container_of(k, struct threshold_block, kobj)
1134 #define to_attr(a)      container_of(a, struct threshold_attr, attr)
1135
1136 static ssize_t show(struct kobject *kobj, struct attribute *attr, char *buf)
1137 {
1138         struct threshold_block *b = to_block(kobj);
1139         struct threshold_attr *a = to_attr(attr);
1140         ssize_t ret;
1141
1142         ret = a->show ? a->show(b, buf) : -EIO;
1143
1144         return ret;
1145 }
1146
1147 static ssize_t store(struct kobject *kobj, struct attribute *attr,
1148                      const char *buf, size_t count)
1149 {
1150         struct threshold_block *b = to_block(kobj);
1151         struct threshold_attr *a = to_attr(attr);
1152         ssize_t ret;
1153
1154         ret = a->store ? a->store(b, buf, count) : -EIO;
1155
1156         return ret;
1157 }
1158
1159 static const struct sysfs_ops threshold_ops = {
1160         .show                   = show,
1161         .store                  = store,
1162 };
1163
1164 static struct kobj_type threshold_ktype = {
1165         .sysfs_ops              = &threshold_ops,
1166         .default_attrs          = default_attrs,
1167 };
1168
1169 static const char *get_name(unsigned int bank, struct threshold_block *b)
1170 {
1171         enum smca_bank_types bank_type;
1172
1173         if (!mce_flags.smca) {
1174                 if (b && bank == 4)
1175                         return bank4_names(b);
1176
1177                 return th_names[bank];
1178         }
1179
1180         bank_type = smca_get_bank_type(bank);
1181         if (bank_type >= N_SMCA_BANK_TYPES)
1182                 return NULL;
1183
1184         if (b && bank_type == SMCA_UMC) {
1185                 if (b->block < ARRAY_SIZE(smca_umc_block_names))
1186                         return smca_umc_block_names[b->block];
1187                 return NULL;
1188         }
1189
1190         if (smca_banks[bank].hwid->count == 1)
1191                 return smca_get_name(bank_type);
1192
1193         snprintf(buf_mcatype, MAX_MCATYPE_NAME_LEN,
1194                  "%s_%x", smca_get_name(bank_type),
1195                           smca_banks[bank].sysfs_id);
1196         return buf_mcatype;
1197 }
1198
1199 static int allocate_threshold_blocks(unsigned int cpu, unsigned int bank,
1200                                      unsigned int block, u32 address)
1201 {
1202         struct threshold_block *b = NULL;
1203         u32 low, high;
1204         int err;
1205
1206         if ((bank >= mca_cfg.banks) || (block >= NR_BLOCKS))
1207                 return 0;
1208
1209         if (rdmsr_safe_on_cpu(cpu, address, &low, &high))
1210                 return 0;
1211
1212         if (!(high & MASK_VALID_HI)) {
1213                 if (block)
1214                         goto recurse;
1215                 else
1216                         return 0;
1217         }
1218
1219         if (!(high & MASK_CNTP_HI)  ||
1220              (high & MASK_LOCKED_HI))
1221                 goto recurse;
1222
1223         b = kzalloc(sizeof(struct threshold_block), GFP_KERNEL);
1224         if (!b)
1225                 return -ENOMEM;
1226
1227         b->block                = block;
1228         b->bank                 = bank;
1229         b->cpu                  = cpu;
1230         b->address              = address;
1231         b->interrupt_enable     = 0;
1232         b->interrupt_capable    = lvt_interrupt_supported(bank, high);
1233         b->threshold_limit      = THRESHOLD_MAX;
1234
1235         if (b->interrupt_capable) {
1236                 threshold_ktype.default_attrs[2] = &interrupt_enable.attr;
1237                 b->interrupt_enable = 1;
1238         } else {
1239                 threshold_ktype.default_attrs[2] = NULL;
1240         }
1241
1242         INIT_LIST_HEAD(&b->miscj);
1243
1244         if (per_cpu(threshold_banks, cpu)[bank]->blocks) {
1245                 list_add(&b->miscj,
1246                          &per_cpu(threshold_banks, cpu)[bank]->blocks->miscj);
1247         } else {
1248                 per_cpu(threshold_banks, cpu)[bank]->blocks = b;
1249         }
1250
1251         err = kobject_init_and_add(&b->kobj, &threshold_ktype,
1252                                    per_cpu(threshold_banks, cpu)[bank]->kobj,
1253                                    get_name(bank, b));
1254         if (err)
1255                 goto out_free;
1256 recurse:
1257         address = get_block_address(address, low, high, bank, ++block);
1258         if (!address)
1259                 return 0;
1260
1261         err = allocate_threshold_blocks(cpu, bank, block, address);
1262         if (err)
1263                 goto out_free;
1264
1265         if (b)
1266                 kobject_uevent(&b->kobj, KOBJ_ADD);
1267
1268         return err;
1269
1270 out_free:
1271         if (b) {
1272                 kobject_put(&b->kobj);
1273                 list_del(&b->miscj);
1274                 kfree(b);
1275         }
1276         return err;
1277 }
1278
1279 static int __threshold_add_blocks(struct threshold_bank *b)
1280 {
1281         struct list_head *head = &b->blocks->miscj;
1282         struct threshold_block *pos = NULL;
1283         struct threshold_block *tmp = NULL;
1284         int err = 0;
1285
1286         err = kobject_add(&b->blocks->kobj, b->kobj, b->blocks->kobj.name);
1287         if (err)
1288                 return err;
1289
1290         list_for_each_entry_safe(pos, tmp, head, miscj) {
1291
1292                 err = kobject_add(&pos->kobj, b->kobj, pos->kobj.name);
1293                 if (err) {
1294                         list_for_each_entry_safe_reverse(pos, tmp, head, miscj)
1295                                 kobject_del(&pos->kobj);
1296
1297                         return err;
1298                 }
1299         }
1300         return err;
1301 }
1302
1303 static int threshold_create_bank(unsigned int cpu, unsigned int bank)
1304 {
1305         struct device *dev = per_cpu(mce_device, cpu);
1306         struct amd_northbridge *nb = NULL;
1307         struct threshold_bank *b = NULL;
1308         const char *name = get_name(bank, NULL);
1309         int err = 0;
1310
1311         if (!dev)
1312                 return -ENODEV;
1313
1314         if (is_shared_bank(bank)) {
1315                 nb = node_to_amd_nb(amd_get_nb_id(cpu));
1316
1317                 /* threshold descriptor already initialized on this node? */
1318                 if (nb && nb->bank4) {
1319                         /* yes, use it */
1320                         b = nb->bank4;
1321                         err = kobject_add(b->kobj, &dev->kobj, name);
1322                         if (err)
1323                                 goto out;
1324
1325                         per_cpu(threshold_banks, cpu)[bank] = b;
1326                         refcount_inc(&b->cpus);
1327
1328                         err = __threshold_add_blocks(b);
1329
1330                         goto out;
1331                 }
1332         }
1333
1334         b = kzalloc(sizeof(struct threshold_bank), GFP_KERNEL);
1335         if (!b) {
1336                 err = -ENOMEM;
1337                 goto out;
1338         }
1339
1340         b->kobj = kobject_create_and_add(name, &dev->kobj);
1341         if (!b->kobj) {
1342                 err = -EINVAL;
1343                 goto out_free;
1344         }
1345
1346         per_cpu(threshold_banks, cpu)[bank] = b;
1347
1348         if (is_shared_bank(bank)) {
1349                 refcount_set(&b->cpus, 1);
1350
1351                 /* nb is already initialized, see above */
1352                 if (nb) {
1353                         WARN_ON(nb->bank4);
1354                         nb->bank4 = b;
1355                 }
1356         }
1357
1358         err = allocate_threshold_blocks(cpu, bank, 0, msr_ops.misc(bank));
1359         if (!err)
1360                 goto out;
1361
1362  out_free:
1363         kfree(b);
1364
1365  out:
1366         return err;
1367 }
1368
1369 static void deallocate_threshold_block(unsigned int cpu,
1370                                                  unsigned int bank)
1371 {
1372         struct threshold_block *pos = NULL;
1373         struct threshold_block *tmp = NULL;
1374         struct threshold_bank *head = per_cpu(threshold_banks, cpu)[bank];
1375
1376         if (!head)
1377                 return;
1378
1379         list_for_each_entry_safe(pos, tmp, &head->blocks->miscj, miscj) {
1380                 kobject_put(&pos->kobj);
1381                 list_del(&pos->miscj);
1382                 kfree(pos);
1383         }
1384
1385         kfree(per_cpu(threshold_banks, cpu)[bank]->blocks);
1386         per_cpu(threshold_banks, cpu)[bank]->blocks = NULL;
1387 }
1388
1389 static void __threshold_remove_blocks(struct threshold_bank *b)
1390 {
1391         struct threshold_block *pos = NULL;
1392         struct threshold_block *tmp = NULL;
1393
1394         kobject_del(b->kobj);
1395
1396         list_for_each_entry_safe(pos, tmp, &b->blocks->miscj, miscj)
1397                 kobject_del(&pos->kobj);
1398 }
1399
1400 static void threshold_remove_bank(unsigned int cpu, int bank)
1401 {
1402         struct amd_northbridge *nb;
1403         struct threshold_bank *b;
1404
1405         b = per_cpu(threshold_banks, cpu)[bank];
1406         if (!b)
1407                 return;
1408
1409         if (!b->blocks)
1410                 goto free_out;
1411
1412         if (is_shared_bank(bank)) {
1413                 if (!refcount_dec_and_test(&b->cpus)) {
1414                         __threshold_remove_blocks(b);
1415                         per_cpu(threshold_banks, cpu)[bank] = NULL;
1416                         return;
1417                 } else {
1418                         /*
1419                          * the last CPU on this node using the shared bank is
1420                          * going away, remove that bank now.
1421                          */
1422                         nb = node_to_amd_nb(amd_get_nb_id(cpu));
1423                         nb->bank4 = NULL;
1424                 }
1425         }
1426
1427         deallocate_threshold_block(cpu, bank);
1428
1429 free_out:
1430         kobject_del(b->kobj);
1431         kobject_put(b->kobj);
1432         kfree(b);
1433         per_cpu(threshold_banks, cpu)[bank] = NULL;
1434 }
1435
1436 int mce_threshold_remove_device(unsigned int cpu)
1437 {
1438         unsigned int bank;
1439
1440         for (bank = 0; bank < mca_cfg.banks; ++bank) {
1441                 if (!(per_cpu(bank_map, cpu) & (1 << bank)))
1442                         continue;
1443                 threshold_remove_bank(cpu, bank);
1444         }
1445         kfree(per_cpu(threshold_banks, cpu));
1446         per_cpu(threshold_banks, cpu) = NULL;
1447         return 0;
1448 }
1449
1450 /* create dir/files for all valid threshold banks */
1451 int mce_threshold_create_device(unsigned int cpu)
1452 {
1453         unsigned int bank;
1454         struct threshold_bank **bp;
1455         int err = 0;
1456
1457         bp = per_cpu(threshold_banks, cpu);
1458         if (bp)
1459                 return 0;
1460
1461         bp = kcalloc(mca_cfg.banks, sizeof(struct threshold_bank *),
1462                      GFP_KERNEL);
1463         if (!bp)
1464                 return -ENOMEM;
1465
1466         per_cpu(threshold_banks, cpu) = bp;
1467
1468         for (bank = 0; bank < mca_cfg.banks; ++bank) {
1469                 if (!(per_cpu(bank_map, cpu) & (1 << bank)))
1470                         continue;
1471                 err = threshold_create_bank(cpu, bank);
1472                 if (err)
1473                         goto err;
1474         }
1475         return err;
1476 err:
1477         mce_threshold_remove_device(cpu);
1478         return err;
1479 }
1480
1481 static __init int threshold_init_device(void)
1482 {
1483         unsigned lcpu = 0;
1484
1485         /* to hit CPUs online before the notifier is up */
1486         for_each_online_cpu(lcpu) {
1487                 int err = mce_threshold_create_device(lcpu);
1488
1489                 if (err)
1490                         return err;
1491         }
1492
1493         if (thresholding_irq_en)
1494                 mce_threshold_vector = amd_threshold_interrupt;
1495
1496         return 0;
1497 }
1498 /*
1499  * there are 3 funcs which need to be _initcalled in a logic sequence:
1500  * 1. xen_late_init_mcelog
1501  * 2. mcheck_init_device
1502  * 3. threshold_init_device
1503  *
1504  * xen_late_init_mcelog must register xen_mce_chrdev_device before
1505  * native mce_chrdev_device registration if running under xen platform;
1506  *
1507  * mcheck_init_device should be inited before threshold_init_device to
1508  * initialize mce_device, otherwise a NULL ptr dereference will cause panic.
1509  *
1510  * so we use following _initcalls
1511  * 1. device_initcall(xen_late_init_mcelog);
1512  * 2. device_initcall_sync(mcheck_init_device);
1513  * 3. late_initcall(threshold_init_device);
1514  *
1515  * when running under xen, the initcall order is 1,2,3;
1516  * on baremetal, we skip 1 and we do only 2 and 3.
1517  */
1518 late_initcall(threshold_init_device);