1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * (c) 2005-2016 Advanced Micro Devices, Inc. 4 * 5 * Written by Jacob Shin - AMD, Inc. 6 * Maintained by: Borislav Petkov <bp@alien8.de> 7 * 8 * All MC4_MISCi registers are shared between cores on a node. 9 */ 10 #include <linux/interrupt.h> 11 #include <linux/notifier.h> 12 #include <linux/kobject.h> 13 #include <linux/percpu.h> 14 #include <linux/errno.h> 15 #include <linux/sched.h> 16 #include <linux/sysfs.h> 17 #include <linux/slab.h> 18 #include <linux/init.h> 19 #include <linux/cpu.h> 20 #include <linux/smp.h> 21 #include <linux/string.h> 22 23 #include <asm/amd_nb.h> 24 #include <asm/traps.h> 25 #include <asm/apic.h> 26 #include <asm/mce.h> 27 #include <asm/msr.h> 28 #include <asm/trace/irq_vectors.h> 29 30 #include "internal.h" 31 32 #define NR_BLOCKS 5 33 #define THRESHOLD_MAX 0xFFF 34 #define INT_TYPE_APIC 0x00020000 35 #define MASK_VALID_HI 0x80000000 36 #define MASK_CNTP_HI 0x40000000 37 #define MASK_LOCKED_HI 0x20000000 38 #define MASK_LVTOFF_HI 0x00F00000 39 #define MASK_COUNT_EN_HI 0x00080000 40 #define MASK_INT_TYPE_HI 0x00060000 41 #define MASK_OVERFLOW_HI 0x00010000 42 #define MASK_ERR_COUNT_HI 0x00000FFF 43 #define MASK_BLKPTR_LO 0xFF000000 44 #define MCG_XBLK_ADDR 0xC0000400 45 46 /* Deferred error settings */ 47 #define MSR_CU_DEF_ERR 0xC0000410 48 #define MASK_DEF_LVTOFF 0x000000F0 49 #define MASK_DEF_INT_TYPE 0x00000006 50 #define DEF_LVT_OFF 0x2 51 #define DEF_INT_TYPE_APIC 0x2 52 53 /* Scalable MCA: */ 54 55 /* Threshold LVT offset is at MSR0xC0000410[15:12] */ 56 #define SMCA_THR_LVT_OFF 0xF000 57 58 static bool thresholding_irq_en; 59 60 static const char * const th_names[] = { 61 "load_store", 62 "insn_fetch", 63 "combined_unit", 64 "decode_unit", 65 "northbridge", 66 "execution_unit", 67 }; 68 69 static const char * const smca_umc_block_names[] = { 70 "dram_ecc", 71 "misc_umc" 72 }; 73 74 #define HWID_MCATYPE(hwid, mcatype) (((hwid) << 16) | (mcatype)) 75 76 struct smca_hwid { 77 unsigned int bank_type; /* Use with smca_bank_types for easy indexing. */ 78 u32 hwid_mcatype; /* (hwid,mcatype) tuple */ 79 }; 80 81 struct smca_bank { 82 const struct smca_hwid *hwid; 83 u32 id; /* Value of MCA_IPID[InstanceId]. */ 84 u8 sysfs_id; /* Value used for sysfs name. */ 85 }; 86 87 static DEFINE_PER_CPU_READ_MOSTLY(struct smca_bank[MAX_NR_BANKS], smca_banks); 88 static DEFINE_PER_CPU_READ_MOSTLY(u8[N_SMCA_BANK_TYPES], smca_bank_counts); 89 90 static const char * const smca_names[] = { 91 [SMCA_LS ... SMCA_LS_V2] = "load_store", 92 [SMCA_IF] = "insn_fetch", 93 [SMCA_L2_CACHE] = "l2_cache", 94 [SMCA_DE] = "decode_unit", 95 [SMCA_RESERVED] = "reserved", 96 [SMCA_EX] = "execution_unit", 97 [SMCA_FP] = "floating_point", 98 [SMCA_L3_CACHE] = "l3_cache", 99 [SMCA_CS ... SMCA_CS_V2] = "coherent_slave", 100 [SMCA_PIE] = "pie", 101 102 /* UMC v2 is separate because both of them can exist in a single system. */ 103 [SMCA_UMC] = "umc", 104 [SMCA_UMC_V2] = "umc_v2", 105 [SMCA_MA_LLC] = "ma_llc", 106 [SMCA_PB] = "param_block", 107 [SMCA_PSP ... SMCA_PSP_V2] = "psp", 108 [SMCA_SMU ... SMCA_SMU_V2] = "smu", 109 [SMCA_MP5] = "mp5", 110 [SMCA_MPDMA] = "mpdma", 111 [SMCA_NBIO] = "nbio", 112 [SMCA_PCIE ... SMCA_PCIE_V2] = "pcie", 113 [SMCA_XGMI_PCS] = "xgmi_pcs", 114 [SMCA_NBIF] = "nbif", 115 [SMCA_SHUB] = "shub", 116 [SMCA_SATA] = "sata", 117 [SMCA_USB] = "usb", 118 [SMCA_USR_DP] = "usr_dp", 119 [SMCA_USR_CP] = "usr_cp", 120 [SMCA_GMI_PCS] = "gmi_pcs", 121 [SMCA_XGMI_PHY] = "xgmi_phy", 122 [SMCA_WAFL_PHY] = "wafl_phy", 123 [SMCA_GMI_PHY] = "gmi_phy", 124 }; 125 126 static const char *smca_get_name(enum smca_bank_types t) 127 { 128 if (t >= N_SMCA_BANK_TYPES) 129 return NULL; 130 131 return smca_names[t]; 132 } 133 134 enum smca_bank_types smca_get_bank_type(unsigned int cpu, unsigned int bank) 135 { 136 struct smca_bank *b; 137 138 if (bank >= MAX_NR_BANKS) 139 return N_SMCA_BANK_TYPES; 140 141 b = &per_cpu(smca_banks, cpu)[bank]; 142 if (!b->hwid) 143 return N_SMCA_BANK_TYPES; 144 145 return b->hwid->bank_type; 146 } 147 EXPORT_SYMBOL_GPL(smca_get_bank_type); 148 149 static const struct smca_hwid smca_hwid_mcatypes[] = { 150 /* { bank_type, hwid_mcatype } */ 151 152 /* Reserved type */ 153 { SMCA_RESERVED, HWID_MCATYPE(0x00, 0x0) }, 154 155 /* ZN Core (HWID=0xB0) MCA types */ 156 { SMCA_LS, HWID_MCATYPE(0xB0, 0x0) }, 157 { SMCA_LS_V2, HWID_MCATYPE(0xB0, 0x10) }, 158 { SMCA_IF, HWID_MCATYPE(0xB0, 0x1) }, 159 { SMCA_L2_CACHE, HWID_MCATYPE(0xB0, 0x2) }, 160 { SMCA_DE, HWID_MCATYPE(0xB0, 0x3) }, 161 /* HWID 0xB0 MCATYPE 0x4 is Reserved */ 162 { SMCA_EX, HWID_MCATYPE(0xB0, 0x5) }, 163 { SMCA_FP, HWID_MCATYPE(0xB0, 0x6) }, 164 { SMCA_L3_CACHE, HWID_MCATYPE(0xB0, 0x7) }, 165 166 /* Data Fabric MCA types */ 167 { SMCA_CS, HWID_MCATYPE(0x2E, 0x0) }, 168 { SMCA_PIE, HWID_MCATYPE(0x2E, 0x1) }, 169 { SMCA_CS_V2, HWID_MCATYPE(0x2E, 0x2) }, 170 { SMCA_MA_LLC, HWID_MCATYPE(0x2E, 0x4) }, 171 172 /* Unified Memory Controller MCA type */ 173 { SMCA_UMC, HWID_MCATYPE(0x96, 0x0) }, 174 { SMCA_UMC_V2, HWID_MCATYPE(0x96, 0x1) }, 175 176 /* Parameter Block MCA type */ 177 { SMCA_PB, HWID_MCATYPE(0x05, 0x0) }, 178 179 /* Platform Security Processor MCA type */ 180 { SMCA_PSP, HWID_MCATYPE(0xFF, 0x0) }, 181 { SMCA_PSP_V2, HWID_MCATYPE(0xFF, 0x1) }, 182 183 /* System Management Unit MCA type */ 184 { SMCA_SMU, HWID_MCATYPE(0x01, 0x0) }, 185 { SMCA_SMU_V2, HWID_MCATYPE(0x01, 0x1) }, 186 187 /* Microprocessor 5 Unit MCA type */ 188 { SMCA_MP5, HWID_MCATYPE(0x01, 0x2) }, 189 190 /* MPDMA MCA type */ 191 { SMCA_MPDMA, HWID_MCATYPE(0x01, 0x3) }, 192 193 /* Northbridge IO Unit MCA type */ 194 { SMCA_NBIO, HWID_MCATYPE(0x18, 0x0) }, 195 196 /* PCI Express Unit MCA type */ 197 { SMCA_PCIE, HWID_MCATYPE(0x46, 0x0) }, 198 { SMCA_PCIE_V2, HWID_MCATYPE(0x46, 0x1) }, 199 200 { SMCA_XGMI_PCS, HWID_MCATYPE(0x50, 0x0) }, 201 { SMCA_NBIF, HWID_MCATYPE(0x6C, 0x0) }, 202 { SMCA_SHUB, HWID_MCATYPE(0x80, 0x0) }, 203 { SMCA_SATA, HWID_MCATYPE(0xA8, 0x0) }, 204 { SMCA_USB, HWID_MCATYPE(0xAA, 0x0) }, 205 { SMCA_USR_DP, HWID_MCATYPE(0x170, 0x0) }, 206 { SMCA_USR_CP, HWID_MCATYPE(0x180, 0x0) }, 207 { SMCA_GMI_PCS, HWID_MCATYPE(0x241, 0x0) }, 208 { SMCA_XGMI_PHY, HWID_MCATYPE(0x259, 0x0) }, 209 { SMCA_WAFL_PHY, HWID_MCATYPE(0x267, 0x0) }, 210 { SMCA_GMI_PHY, HWID_MCATYPE(0x269, 0x0) }, 211 }; 212 213 /* 214 * In SMCA enabled processors, we can have multiple banks for a given IP type. 215 * So to define a unique name for each bank, we use a temp c-string to append 216 * the MCA_IPID[InstanceId] to type's name in get_name(). 217 * 218 * InstanceId is 32 bits which is 8 characters. Make sure MAX_MCATYPE_NAME_LEN 219 * is greater than 8 plus 1 (for underscore) plus length of longest type name. 220 */ 221 #define MAX_MCATYPE_NAME_LEN 30 222 static char buf_mcatype[MAX_MCATYPE_NAME_LEN]; 223 224 static DEFINE_PER_CPU(struct threshold_bank **, threshold_banks); 225 226 /* 227 * A list of the banks enabled on each logical CPU. Controls which respective 228 * descriptors to initialize later in mce_threshold_create_device(). 229 */ 230 static DEFINE_PER_CPU(u64, bank_map); 231 232 /* Map of banks that have more than MCA_MISC0 available. */ 233 static DEFINE_PER_CPU(u64, smca_misc_banks_map); 234 235 static void amd_threshold_interrupt(void); 236 static void amd_deferred_error_interrupt(void); 237 238 static void default_deferred_error_interrupt(void) 239 { 240 pr_err("Unexpected deferred interrupt at vector %x\n", DEFERRED_ERROR_VECTOR); 241 } 242 void (*deferred_error_int_vector)(void) = default_deferred_error_interrupt; 243 244 static void smca_set_misc_banks_map(unsigned int bank, unsigned int cpu) 245 { 246 u32 low, high; 247 248 /* 249 * For SMCA enabled processors, BLKPTR field of the first MISC register 250 * (MCx_MISC0) indicates presence of additional MISC regs set (MISC1-4). 251 */ 252 if (rdmsr_safe(MSR_AMD64_SMCA_MCx_CONFIG(bank), &low, &high)) 253 return; 254 255 if (!(low & MCI_CONFIG_MCAX)) 256 return; 257 258 if (rdmsr_safe(MSR_AMD64_SMCA_MCx_MISC(bank), &low, &high)) 259 return; 260 261 if (low & MASK_BLKPTR_LO) 262 per_cpu(smca_misc_banks_map, cpu) |= BIT_ULL(bank); 263 264 } 265 266 static void smca_configure(unsigned int bank, unsigned int cpu) 267 { 268 u8 *bank_counts = this_cpu_ptr(smca_bank_counts); 269 const struct smca_hwid *s_hwid; 270 unsigned int i, hwid_mcatype; 271 u32 high, low; 272 u32 smca_config = MSR_AMD64_SMCA_MCx_CONFIG(bank); 273 274 /* Set appropriate bits in MCA_CONFIG */ 275 if (!rdmsr_safe(smca_config, &low, &high)) { 276 /* 277 * OS is required to set the MCAX bit to acknowledge that it is 278 * now using the new MSR ranges and new registers under each 279 * bank. It also means that the OS will configure deferred 280 * errors in the new MCx_CONFIG register. If the bit is not set, 281 * uncorrectable errors will cause a system panic. 282 * 283 * MCA_CONFIG[MCAX] is bit 32 (0 in the high portion of the MSR.) 284 */ 285 high |= BIT(0); 286 287 /* 288 * SMCA sets the Deferred Error Interrupt type per bank. 289 * 290 * MCA_CONFIG[DeferredIntTypeSupported] is bit 5, and tells us 291 * if the DeferredIntType bit field is available. 292 * 293 * MCA_CONFIG[DeferredIntType] is bits [38:37] ([6:5] in the 294 * high portion of the MSR). OS should set this to 0x1 to enable 295 * APIC based interrupt. First, check that no interrupt has been 296 * set. 297 */ 298 if ((low & BIT(5)) && !((high >> 5) & 0x3)) 299 high |= BIT(5); 300 301 this_cpu_ptr(mce_banks_array)[bank].lsb_in_status = !!(low & BIT(8)); 302 303 wrmsr(smca_config, low, high); 304 } 305 306 smca_set_misc_banks_map(bank, cpu); 307 308 if (rdmsr_safe(MSR_AMD64_SMCA_MCx_IPID(bank), &low, &high)) { 309 pr_warn("Failed to read MCA_IPID for bank %d\n", bank); 310 return; 311 } 312 313 hwid_mcatype = HWID_MCATYPE(high & MCI_IPID_HWID, 314 (high & MCI_IPID_MCATYPE) >> 16); 315 316 for (i = 0; i < ARRAY_SIZE(smca_hwid_mcatypes); i++) { 317 s_hwid = &smca_hwid_mcatypes[i]; 318 319 if (hwid_mcatype == s_hwid->hwid_mcatype) { 320 this_cpu_ptr(smca_banks)[bank].hwid = s_hwid; 321 this_cpu_ptr(smca_banks)[bank].id = low; 322 this_cpu_ptr(smca_banks)[bank].sysfs_id = bank_counts[s_hwid->bank_type]++; 323 break; 324 } 325 } 326 } 327 328 struct thresh_restart { 329 struct threshold_block *b; 330 int reset; 331 int set_lvt_off; 332 int lvt_off; 333 u16 old_limit; 334 }; 335 336 static inline bool is_shared_bank(int bank) 337 { 338 /* 339 * Scalable MCA provides for only one core to have access to the MSRs of 340 * a shared bank. 341 */ 342 if (mce_flags.smca) 343 return false; 344 345 /* Bank 4 is for northbridge reporting and is thus shared */ 346 return (bank == 4); 347 } 348 349 static const char *bank4_names(const struct threshold_block *b) 350 { 351 switch (b->address) { 352 /* MSR4_MISC0 */ 353 case 0x00000413: 354 return "dram"; 355 356 case 0xc0000408: 357 return "ht_links"; 358 359 case 0xc0000409: 360 return "l3_cache"; 361 362 default: 363 WARN(1, "Funny MSR: 0x%08x\n", b->address); 364 return ""; 365 } 366 }; 367 368 369 static bool lvt_interrupt_supported(unsigned int bank, u32 msr_high_bits) 370 { 371 /* 372 * bank 4 supports APIC LVT interrupts implicitly since forever. 373 */ 374 if (bank == 4) 375 return true; 376 377 /* 378 * IntP: interrupt present; if this bit is set, the thresholding 379 * bank can generate APIC LVT interrupts 380 */ 381 return msr_high_bits & BIT(28); 382 } 383 384 static int lvt_off_valid(struct threshold_block *b, int apic, u32 lo, u32 hi) 385 { 386 int msr = (hi & MASK_LVTOFF_HI) >> 20; 387 388 if (apic < 0) { 389 pr_err(FW_BUG "cpu %d, failed to setup threshold interrupt " 390 "for bank %d, block %d (MSR%08X=0x%x%08x)\n", b->cpu, 391 b->bank, b->block, b->address, hi, lo); 392 return 0; 393 } 394 395 if (apic != msr) { 396 /* 397 * On SMCA CPUs, LVT offset is programmed at a different MSR, and 398 * the BIOS provides the value. The original field where LVT offset 399 * was set is reserved. Return early here: 400 */ 401 if (mce_flags.smca) 402 return 0; 403 404 pr_err(FW_BUG "cpu %d, invalid threshold interrupt offset %d " 405 "for bank %d, block %d (MSR%08X=0x%x%08x)\n", 406 b->cpu, apic, b->bank, b->block, b->address, hi, lo); 407 return 0; 408 } 409 410 return 1; 411 }; 412 413 /* Reprogram MCx_MISC MSR behind this threshold bank. */ 414 static void threshold_restart_bank(void *_tr) 415 { 416 struct thresh_restart *tr = _tr; 417 u32 hi, lo; 418 419 /* sysfs write might race against an offline operation */ 420 if (!this_cpu_read(threshold_banks) && !tr->set_lvt_off) 421 return; 422 423 rdmsr(tr->b->address, lo, hi); 424 425 if (tr->b->threshold_limit < (hi & THRESHOLD_MAX)) 426 tr->reset = 1; /* limit cannot be lower than err count */ 427 428 if (tr->reset) { /* reset err count and overflow bit */ 429 hi = 430 (hi & ~(MASK_ERR_COUNT_HI | MASK_OVERFLOW_HI)) | 431 (THRESHOLD_MAX - tr->b->threshold_limit); 432 } else if (tr->old_limit) { /* change limit w/o reset */ 433 int new_count = (hi & THRESHOLD_MAX) + 434 (tr->old_limit - tr->b->threshold_limit); 435 436 hi = (hi & ~MASK_ERR_COUNT_HI) | 437 (new_count & THRESHOLD_MAX); 438 } 439 440 /* clear IntType */ 441 hi &= ~MASK_INT_TYPE_HI; 442 443 if (!tr->b->interrupt_capable) 444 goto done; 445 446 if (tr->set_lvt_off) { 447 if (lvt_off_valid(tr->b, tr->lvt_off, lo, hi)) { 448 /* set new lvt offset */ 449 hi &= ~MASK_LVTOFF_HI; 450 hi |= tr->lvt_off << 20; 451 } 452 } 453 454 if (tr->b->interrupt_enable) 455 hi |= INT_TYPE_APIC; 456 457 done: 458 459 hi |= MASK_COUNT_EN_HI; 460 wrmsr(tr->b->address, lo, hi); 461 } 462 463 static void mce_threshold_block_init(struct threshold_block *b, int offset) 464 { 465 struct thresh_restart tr = { 466 .b = b, 467 .set_lvt_off = 1, 468 .lvt_off = offset, 469 }; 470 471 b->threshold_limit = THRESHOLD_MAX; 472 threshold_restart_bank(&tr); 473 }; 474 475 static int setup_APIC_mce_threshold(int reserved, int new) 476 { 477 if (reserved < 0 && !setup_APIC_eilvt(new, THRESHOLD_APIC_VECTOR, 478 APIC_EILVT_MSG_FIX, 0)) 479 return new; 480 481 return reserved; 482 } 483 484 static int setup_APIC_deferred_error(int reserved, int new) 485 { 486 if (reserved < 0 && !setup_APIC_eilvt(new, DEFERRED_ERROR_VECTOR, 487 APIC_EILVT_MSG_FIX, 0)) 488 return new; 489 490 return reserved; 491 } 492 493 static void deferred_error_interrupt_enable(struct cpuinfo_x86 *c) 494 { 495 u32 low = 0, high = 0; 496 int def_offset = -1, def_new; 497 498 if (rdmsr_safe(MSR_CU_DEF_ERR, &low, &high)) 499 return; 500 501 def_new = (low & MASK_DEF_LVTOFF) >> 4; 502 if (!(low & MASK_DEF_LVTOFF)) { 503 pr_err(FW_BUG "Your BIOS is not setting up LVT offset 0x2 for deferred error IRQs correctly.\n"); 504 def_new = DEF_LVT_OFF; 505 low = (low & ~MASK_DEF_LVTOFF) | (DEF_LVT_OFF << 4); 506 } 507 508 def_offset = setup_APIC_deferred_error(def_offset, def_new); 509 if ((def_offset == def_new) && 510 (deferred_error_int_vector != amd_deferred_error_interrupt)) 511 deferred_error_int_vector = amd_deferred_error_interrupt; 512 513 if (!mce_flags.smca) 514 low = (low & ~MASK_DEF_INT_TYPE) | DEF_INT_TYPE_APIC; 515 516 wrmsr(MSR_CU_DEF_ERR, low, high); 517 } 518 519 static u32 smca_get_block_address(unsigned int bank, unsigned int block, 520 unsigned int cpu) 521 { 522 if (!block) 523 return MSR_AMD64_SMCA_MCx_MISC(bank); 524 525 if (!(per_cpu(smca_misc_banks_map, cpu) & BIT_ULL(bank))) 526 return 0; 527 528 return MSR_AMD64_SMCA_MCx_MISCy(bank, block - 1); 529 } 530 531 static u32 get_block_address(u32 current_addr, u32 low, u32 high, 532 unsigned int bank, unsigned int block, 533 unsigned int cpu) 534 { 535 u32 addr = 0, offset = 0; 536 537 if ((bank >= per_cpu(mce_num_banks, cpu)) || (block >= NR_BLOCKS)) 538 return addr; 539 540 if (mce_flags.smca) 541 return smca_get_block_address(bank, block, cpu); 542 543 /* Fall back to method we used for older processors: */ 544 switch (block) { 545 case 0: 546 addr = mca_msr_reg(bank, MCA_MISC); 547 break; 548 case 1: 549 offset = ((low & MASK_BLKPTR_LO) >> 21); 550 if (offset) 551 addr = MCG_XBLK_ADDR + offset; 552 break; 553 default: 554 addr = ++current_addr; 555 } 556 return addr; 557 } 558 559 static int 560 prepare_threshold_block(unsigned int bank, unsigned int block, u32 addr, 561 int offset, u32 misc_high) 562 { 563 unsigned int cpu = smp_processor_id(); 564 u32 smca_low, smca_high; 565 struct threshold_block b; 566 int new; 567 568 if (!block) 569 per_cpu(bank_map, cpu) |= BIT_ULL(bank); 570 571 memset(&b, 0, sizeof(b)); 572 b.cpu = cpu; 573 b.bank = bank; 574 b.block = block; 575 b.address = addr; 576 b.interrupt_capable = lvt_interrupt_supported(bank, misc_high); 577 578 if (!b.interrupt_capable) 579 goto done; 580 581 b.interrupt_enable = 1; 582 583 if (!mce_flags.smca) { 584 new = (misc_high & MASK_LVTOFF_HI) >> 20; 585 goto set_offset; 586 } 587 588 /* Gather LVT offset for thresholding: */ 589 if (rdmsr_safe(MSR_CU_DEF_ERR, &smca_low, &smca_high)) 590 goto out; 591 592 new = (smca_low & SMCA_THR_LVT_OFF) >> 12; 593 594 set_offset: 595 offset = setup_APIC_mce_threshold(offset, new); 596 if (offset == new) 597 thresholding_irq_en = true; 598 599 done: 600 mce_threshold_block_init(&b, offset); 601 602 out: 603 return offset; 604 } 605 606 bool amd_filter_mce(struct mce *m) 607 { 608 enum smca_bank_types bank_type = smca_get_bank_type(m->extcpu, m->bank); 609 struct cpuinfo_x86 *c = &boot_cpu_data; 610 611 /* See Family 17h Models 10h-2Fh Erratum #1114. */ 612 if (c->x86 == 0x17 && 613 c->x86_model >= 0x10 && c->x86_model <= 0x2F && 614 bank_type == SMCA_IF && XEC(m->status, 0x3f) == 10) 615 return true; 616 617 /* NB GART TLB error reporting is disabled by default. */ 618 if (c->x86 < 0x17) { 619 if (m->bank == 4 && XEC(m->status, 0x1f) == 0x5) 620 return true; 621 } 622 623 return false; 624 } 625 626 /* 627 * Turn off thresholding banks for the following conditions: 628 * - MC4_MISC thresholding is not supported on Family 0x15. 629 * - Prevent possible spurious interrupts from the IF bank on Family 0x17 630 * Models 0x10-0x2F due to Erratum #1114. 631 */ 632 static void disable_err_thresholding(struct cpuinfo_x86 *c, unsigned int bank) 633 { 634 int i, num_msrs; 635 u64 hwcr; 636 bool need_toggle; 637 u32 msrs[NR_BLOCKS]; 638 639 if (c->x86 == 0x15 && bank == 4) { 640 msrs[0] = 0x00000413; /* MC4_MISC0 */ 641 msrs[1] = 0xc0000408; /* MC4_MISC1 */ 642 num_msrs = 2; 643 } else if (c->x86 == 0x17 && 644 (c->x86_model >= 0x10 && c->x86_model <= 0x2F)) { 645 646 if (smca_get_bank_type(smp_processor_id(), bank) != SMCA_IF) 647 return; 648 649 msrs[0] = MSR_AMD64_SMCA_MCx_MISC(bank); 650 num_msrs = 1; 651 } else { 652 return; 653 } 654 655 rdmsrl(MSR_K7_HWCR, hwcr); 656 657 /* McStatusWrEn has to be set */ 658 need_toggle = !(hwcr & BIT(18)); 659 if (need_toggle) 660 wrmsrl(MSR_K7_HWCR, hwcr | BIT(18)); 661 662 /* Clear CntP bit safely */ 663 for (i = 0; i < num_msrs; i++) 664 msr_clear_bit(msrs[i], 62); 665 666 /* restore old settings */ 667 if (need_toggle) 668 wrmsrl(MSR_K7_HWCR, hwcr); 669 } 670 671 /* cpu init entry point, called from mce.c with preempt off */ 672 void mce_amd_feature_init(struct cpuinfo_x86 *c) 673 { 674 unsigned int bank, block, cpu = smp_processor_id(); 675 u32 low = 0, high = 0, address = 0; 676 int offset = -1; 677 678 679 for (bank = 0; bank < this_cpu_read(mce_num_banks); ++bank) { 680 if (mce_flags.smca) 681 smca_configure(bank, cpu); 682 683 disable_err_thresholding(c, bank); 684 685 for (block = 0; block < NR_BLOCKS; ++block) { 686 address = get_block_address(address, low, high, bank, block, cpu); 687 if (!address) 688 break; 689 690 if (rdmsr_safe(address, &low, &high)) 691 break; 692 693 if (!(high & MASK_VALID_HI)) 694 continue; 695 696 if (!(high & MASK_CNTP_HI) || 697 (high & MASK_LOCKED_HI)) 698 continue; 699 700 offset = prepare_threshold_block(bank, block, address, offset, high); 701 } 702 } 703 704 if (mce_flags.succor) 705 deferred_error_interrupt_enable(c); 706 } 707 708 /* 709 * DRAM ECC errors are reported in the Northbridge (bank 4) with 710 * Extended Error Code 8. 711 */ 712 static bool legacy_mce_is_memory_error(struct mce *m) 713 { 714 return m->bank == 4 && XEC(m->status, 0x1f) == 8; 715 } 716 717 /* 718 * DRAM ECC errors are reported in Unified Memory Controllers with 719 * Extended Error Code 0. 720 */ 721 static bool smca_mce_is_memory_error(struct mce *m) 722 { 723 enum smca_bank_types bank_type; 724 725 if (XEC(m->status, 0x3f)) 726 return false; 727 728 bank_type = smca_get_bank_type(m->extcpu, m->bank); 729 730 return bank_type == SMCA_UMC || bank_type == SMCA_UMC_V2; 731 } 732 733 bool amd_mce_is_memory_error(struct mce *m) 734 { 735 if (mce_flags.smca) 736 return smca_mce_is_memory_error(m); 737 else 738 return legacy_mce_is_memory_error(m); 739 } 740 741 /* 742 * AMD systems do not have an explicit indicator that the value in MCA_ADDR is 743 * a system physical address. Therefore, individual cases need to be detected. 744 * Future cases and checks will be added as needed. 745 * 746 * 1) General case 747 * a) Assume address is not usable. 748 * 2) Poison errors 749 * a) Indicated by MCA_STATUS[43]: poison. Defined for all banks except legacy 750 * northbridge (bank 4). 751 * b) Refers to poison consumption in the core. Does not include "no action", 752 * "action optional", or "deferred" error severities. 753 * c) Will include a usable address so that immediate action can be taken. 754 * 3) Northbridge DRAM ECC errors 755 * a) Reported in legacy bank 4 with extended error code (XEC) 8. 756 * b) MCA_STATUS[43] is *not* defined as poison in legacy bank 4. Therefore, 757 * this bit should not be checked. 758 * 759 * NOTE: SMCA UMC memory errors fall into case #1. 760 */ 761 bool amd_mce_usable_address(struct mce *m) 762 { 763 /* Check special northbridge case 3) first. */ 764 if (!mce_flags.smca) { 765 if (legacy_mce_is_memory_error(m)) 766 return true; 767 else if (m->bank == 4) 768 return false; 769 } 770 771 /* Check poison bit for all other bank types. */ 772 if (m->status & MCI_STATUS_POISON) 773 return true; 774 775 /* Assume address is not usable for all others. */ 776 return false; 777 } 778 779 static void __log_error(unsigned int bank, u64 status, u64 addr, u64 misc) 780 { 781 struct mce m; 782 783 mce_prep_record(&m); 784 785 m.status = status; 786 m.misc = misc; 787 m.bank = bank; 788 m.tsc = rdtsc(); 789 790 if (m.status & MCI_STATUS_ADDRV) { 791 m.addr = addr; 792 793 smca_extract_err_addr(&m); 794 } 795 796 if (mce_flags.smca) { 797 rdmsrl(MSR_AMD64_SMCA_MCx_IPID(bank), m.ipid); 798 799 if (m.status & MCI_STATUS_SYNDV) 800 rdmsrl(MSR_AMD64_SMCA_MCx_SYND(bank), m.synd); 801 } 802 803 mce_log(&m); 804 } 805 806 DEFINE_IDTENTRY_SYSVEC(sysvec_deferred_error) 807 { 808 trace_deferred_error_apic_entry(DEFERRED_ERROR_VECTOR); 809 inc_irq_stat(irq_deferred_error_count); 810 deferred_error_int_vector(); 811 trace_deferred_error_apic_exit(DEFERRED_ERROR_VECTOR); 812 apic_eoi(); 813 } 814 815 /* 816 * Returns true if the logged error is deferred. False, otherwise. 817 */ 818 static inline bool 819 _log_error_bank(unsigned int bank, u32 msr_stat, u32 msr_addr, u64 misc) 820 { 821 u64 status, addr = 0; 822 823 rdmsrl(msr_stat, status); 824 if (!(status & MCI_STATUS_VAL)) 825 return false; 826 827 if (status & MCI_STATUS_ADDRV) 828 rdmsrl(msr_addr, addr); 829 830 __log_error(bank, status, addr, misc); 831 832 wrmsrl(msr_stat, 0); 833 834 return status & MCI_STATUS_DEFERRED; 835 } 836 837 static bool _log_error_deferred(unsigned int bank, u32 misc) 838 { 839 if (!_log_error_bank(bank, mca_msr_reg(bank, MCA_STATUS), 840 mca_msr_reg(bank, MCA_ADDR), misc)) 841 return false; 842 843 /* 844 * Non-SMCA systems don't have MCA_DESTAT/MCA_DEADDR registers. 845 * Return true here to avoid accessing these registers. 846 */ 847 if (!mce_flags.smca) 848 return true; 849 850 /* Clear MCA_DESTAT if the deferred error was logged from MCA_STATUS. */ 851 wrmsrl(MSR_AMD64_SMCA_MCx_DESTAT(bank), 0); 852 return true; 853 } 854 855 /* 856 * We have three scenarios for checking for Deferred errors: 857 * 858 * 1) Non-SMCA systems check MCA_STATUS and log error if found. 859 * 2) SMCA systems check MCA_STATUS. If error is found then log it and also 860 * clear MCA_DESTAT. 861 * 3) SMCA systems check MCA_DESTAT, if error was not found in MCA_STATUS, and 862 * log it. 863 */ 864 static void log_error_deferred(unsigned int bank) 865 { 866 if (_log_error_deferred(bank, 0)) 867 return; 868 869 /* 870 * Only deferred errors are logged in MCA_DE{STAT,ADDR} so just check 871 * for a valid error. 872 */ 873 _log_error_bank(bank, MSR_AMD64_SMCA_MCx_DESTAT(bank), 874 MSR_AMD64_SMCA_MCx_DEADDR(bank), 0); 875 } 876 877 /* APIC interrupt handler for deferred errors */ 878 static void amd_deferred_error_interrupt(void) 879 { 880 unsigned int bank; 881 882 for (bank = 0; bank < this_cpu_read(mce_num_banks); ++bank) 883 log_error_deferred(bank); 884 } 885 886 static void log_error_thresholding(unsigned int bank, u64 misc) 887 { 888 _log_error_deferred(bank, misc); 889 } 890 891 static void log_and_reset_block(struct threshold_block *block) 892 { 893 struct thresh_restart tr; 894 u32 low = 0, high = 0; 895 896 if (!block) 897 return; 898 899 if (rdmsr_safe(block->address, &low, &high)) 900 return; 901 902 if (!(high & MASK_OVERFLOW_HI)) 903 return; 904 905 /* Log the MCE which caused the threshold event. */ 906 log_error_thresholding(block->bank, ((u64)high << 32) | low); 907 908 /* Reset threshold block after logging error. */ 909 memset(&tr, 0, sizeof(tr)); 910 tr.b = block; 911 threshold_restart_bank(&tr); 912 } 913 914 /* 915 * Threshold interrupt handler will service THRESHOLD_APIC_VECTOR. The interrupt 916 * goes off when error_count reaches threshold_limit. 917 */ 918 static void amd_threshold_interrupt(void) 919 { 920 struct threshold_block *first_block = NULL, *block = NULL, *tmp = NULL; 921 struct threshold_bank **bp = this_cpu_read(threshold_banks); 922 unsigned int bank, cpu = smp_processor_id(); 923 924 /* 925 * Validate that the threshold bank has been initialized already. The 926 * handler is installed at boot time, but on a hotplug event the 927 * interrupt might fire before the data has been initialized. 928 */ 929 if (!bp) 930 return; 931 932 for (bank = 0; bank < this_cpu_read(mce_num_banks); ++bank) { 933 if (!(per_cpu(bank_map, cpu) & BIT_ULL(bank))) 934 continue; 935 936 first_block = bp[bank]->blocks; 937 if (!first_block) 938 continue; 939 940 /* 941 * The first block is also the head of the list. Check it first 942 * before iterating over the rest. 943 */ 944 log_and_reset_block(first_block); 945 list_for_each_entry_safe(block, tmp, &first_block->miscj, miscj) 946 log_and_reset_block(block); 947 } 948 } 949 950 /* 951 * Sysfs Interface 952 */ 953 954 struct threshold_attr { 955 struct attribute attr; 956 ssize_t (*show) (struct threshold_block *, char *); 957 ssize_t (*store) (struct threshold_block *, const char *, size_t count); 958 }; 959 960 #define SHOW_FIELDS(name) \ 961 static ssize_t show_ ## name(struct threshold_block *b, char *buf) \ 962 { \ 963 return sprintf(buf, "%lu\n", (unsigned long) b->name); \ 964 } 965 SHOW_FIELDS(interrupt_enable) 966 SHOW_FIELDS(threshold_limit) 967 968 static ssize_t 969 store_interrupt_enable(struct threshold_block *b, const char *buf, size_t size) 970 { 971 struct thresh_restart tr; 972 unsigned long new; 973 974 if (!b->interrupt_capable) 975 return -EINVAL; 976 977 if (kstrtoul(buf, 0, &new) < 0) 978 return -EINVAL; 979 980 b->interrupt_enable = !!new; 981 982 memset(&tr, 0, sizeof(tr)); 983 tr.b = b; 984 985 if (smp_call_function_single(b->cpu, threshold_restart_bank, &tr, 1)) 986 return -ENODEV; 987 988 return size; 989 } 990 991 static ssize_t 992 store_threshold_limit(struct threshold_block *b, const char *buf, size_t size) 993 { 994 struct thresh_restart tr; 995 unsigned long new; 996 997 if (kstrtoul(buf, 0, &new) < 0) 998 return -EINVAL; 999 1000 if (new > THRESHOLD_MAX) 1001 new = THRESHOLD_MAX; 1002 if (new < 1) 1003 new = 1; 1004 1005 memset(&tr, 0, sizeof(tr)); 1006 tr.old_limit = b->threshold_limit; 1007 b->threshold_limit = new; 1008 tr.b = b; 1009 1010 if (smp_call_function_single(b->cpu, threshold_restart_bank, &tr, 1)) 1011 return -ENODEV; 1012 1013 return size; 1014 } 1015 1016 static ssize_t show_error_count(struct threshold_block *b, char *buf) 1017 { 1018 u32 lo, hi; 1019 1020 /* CPU might be offline by now */ 1021 if (rdmsr_on_cpu(b->cpu, b->address, &lo, &hi)) 1022 return -ENODEV; 1023 1024 return sprintf(buf, "%u\n", ((hi & THRESHOLD_MAX) - 1025 (THRESHOLD_MAX - b->threshold_limit))); 1026 } 1027 1028 static struct threshold_attr error_count = { 1029 .attr = {.name = __stringify(error_count), .mode = 0444 }, 1030 .show = show_error_count, 1031 }; 1032 1033 #define RW_ATTR(val) \ 1034 static struct threshold_attr val = { \ 1035 .attr = {.name = __stringify(val), .mode = 0644 }, \ 1036 .show = show_## val, \ 1037 .store = store_## val, \ 1038 }; 1039 1040 RW_ATTR(interrupt_enable); 1041 RW_ATTR(threshold_limit); 1042 1043 static struct attribute *default_attrs[] = { 1044 &threshold_limit.attr, 1045 &error_count.attr, 1046 NULL, /* possibly interrupt_enable if supported, see below */ 1047 NULL, 1048 }; 1049 ATTRIBUTE_GROUPS(default); 1050 1051 #define to_block(k) container_of(k, struct threshold_block, kobj) 1052 #define to_attr(a) container_of(a, struct threshold_attr, attr) 1053 1054 static ssize_t show(struct kobject *kobj, struct attribute *attr, char *buf) 1055 { 1056 struct threshold_block *b = to_block(kobj); 1057 struct threshold_attr *a = to_attr(attr); 1058 ssize_t ret; 1059 1060 ret = a->show ? a->show(b, buf) : -EIO; 1061 1062 return ret; 1063 } 1064 1065 static ssize_t store(struct kobject *kobj, struct attribute *attr, 1066 const char *buf, size_t count) 1067 { 1068 struct threshold_block *b = to_block(kobj); 1069 struct threshold_attr *a = to_attr(attr); 1070 ssize_t ret; 1071 1072 ret = a->store ? a->store(b, buf, count) : -EIO; 1073 1074 return ret; 1075 } 1076 1077 static const struct sysfs_ops threshold_ops = { 1078 .show = show, 1079 .store = store, 1080 }; 1081 1082 static void threshold_block_release(struct kobject *kobj); 1083 1084 static const struct kobj_type threshold_ktype = { 1085 .sysfs_ops = &threshold_ops, 1086 .default_groups = default_groups, 1087 .release = threshold_block_release, 1088 }; 1089 1090 static const char *get_name(unsigned int cpu, unsigned int bank, struct threshold_block *b) 1091 { 1092 enum smca_bank_types bank_type; 1093 1094 if (!mce_flags.smca) { 1095 if (b && bank == 4) 1096 return bank4_names(b); 1097 1098 return th_names[bank]; 1099 } 1100 1101 bank_type = smca_get_bank_type(cpu, bank); 1102 if (bank_type >= N_SMCA_BANK_TYPES) 1103 return NULL; 1104 1105 if (b && (bank_type == SMCA_UMC || bank_type == SMCA_UMC_V2)) { 1106 if (b->block < ARRAY_SIZE(smca_umc_block_names)) 1107 return smca_umc_block_names[b->block]; 1108 return NULL; 1109 } 1110 1111 if (per_cpu(smca_bank_counts, cpu)[bank_type] == 1) 1112 return smca_get_name(bank_type); 1113 1114 snprintf(buf_mcatype, MAX_MCATYPE_NAME_LEN, 1115 "%s_%u", smca_get_name(bank_type), 1116 per_cpu(smca_banks, cpu)[bank].sysfs_id); 1117 return buf_mcatype; 1118 } 1119 1120 static int allocate_threshold_blocks(unsigned int cpu, struct threshold_bank *tb, 1121 unsigned int bank, unsigned int block, 1122 u32 address) 1123 { 1124 struct threshold_block *b = NULL; 1125 u32 low, high; 1126 int err; 1127 1128 if ((bank >= this_cpu_read(mce_num_banks)) || (block >= NR_BLOCKS)) 1129 return 0; 1130 1131 if (rdmsr_safe(address, &low, &high)) 1132 return 0; 1133 1134 if (!(high & MASK_VALID_HI)) { 1135 if (block) 1136 goto recurse; 1137 else 1138 return 0; 1139 } 1140 1141 if (!(high & MASK_CNTP_HI) || 1142 (high & MASK_LOCKED_HI)) 1143 goto recurse; 1144 1145 b = kzalloc(sizeof(struct threshold_block), GFP_KERNEL); 1146 if (!b) 1147 return -ENOMEM; 1148 1149 b->block = block; 1150 b->bank = bank; 1151 b->cpu = cpu; 1152 b->address = address; 1153 b->interrupt_enable = 0; 1154 b->interrupt_capable = lvt_interrupt_supported(bank, high); 1155 b->threshold_limit = THRESHOLD_MAX; 1156 1157 if (b->interrupt_capable) { 1158 default_attrs[2] = &interrupt_enable.attr; 1159 b->interrupt_enable = 1; 1160 } else { 1161 default_attrs[2] = NULL; 1162 } 1163 1164 INIT_LIST_HEAD(&b->miscj); 1165 1166 /* This is safe as @tb is not visible yet */ 1167 if (tb->blocks) 1168 list_add(&b->miscj, &tb->blocks->miscj); 1169 else 1170 tb->blocks = b; 1171 1172 err = kobject_init_and_add(&b->kobj, &threshold_ktype, tb->kobj, get_name(cpu, bank, b)); 1173 if (err) 1174 goto out_free; 1175 recurse: 1176 address = get_block_address(address, low, high, bank, ++block, cpu); 1177 if (!address) 1178 return 0; 1179 1180 err = allocate_threshold_blocks(cpu, tb, bank, block, address); 1181 if (err) 1182 goto out_free; 1183 1184 if (b) 1185 kobject_uevent(&b->kobj, KOBJ_ADD); 1186 1187 return 0; 1188 1189 out_free: 1190 if (b) { 1191 list_del(&b->miscj); 1192 kobject_put(&b->kobj); 1193 } 1194 return err; 1195 } 1196 1197 static int __threshold_add_blocks(struct threshold_bank *b) 1198 { 1199 struct list_head *head = &b->blocks->miscj; 1200 struct threshold_block *pos = NULL; 1201 struct threshold_block *tmp = NULL; 1202 int err = 0; 1203 1204 err = kobject_add(&b->blocks->kobj, b->kobj, b->blocks->kobj.name); 1205 if (err) 1206 return err; 1207 1208 list_for_each_entry_safe(pos, tmp, head, miscj) { 1209 1210 err = kobject_add(&pos->kobj, b->kobj, pos->kobj.name); 1211 if (err) { 1212 list_for_each_entry_safe_reverse(pos, tmp, head, miscj) 1213 kobject_del(&pos->kobj); 1214 1215 return err; 1216 } 1217 } 1218 return err; 1219 } 1220 1221 static int threshold_create_bank(struct threshold_bank **bp, unsigned int cpu, 1222 unsigned int bank) 1223 { 1224 struct device *dev = this_cpu_read(mce_device); 1225 struct amd_northbridge *nb = NULL; 1226 struct threshold_bank *b = NULL; 1227 const char *name = get_name(cpu, bank, NULL); 1228 int err = 0; 1229 1230 if (!dev) 1231 return -ENODEV; 1232 1233 if (is_shared_bank(bank)) { 1234 nb = node_to_amd_nb(topology_amd_node_id(cpu)); 1235 1236 /* threshold descriptor already initialized on this node? */ 1237 if (nb && nb->bank4) { 1238 /* yes, use it */ 1239 b = nb->bank4; 1240 err = kobject_add(b->kobj, &dev->kobj, name); 1241 if (err) 1242 goto out; 1243 1244 bp[bank] = b; 1245 refcount_inc(&b->cpus); 1246 1247 err = __threshold_add_blocks(b); 1248 1249 goto out; 1250 } 1251 } 1252 1253 b = kzalloc(sizeof(struct threshold_bank), GFP_KERNEL); 1254 if (!b) { 1255 err = -ENOMEM; 1256 goto out; 1257 } 1258 1259 /* Associate the bank with the per-CPU MCE device */ 1260 b->kobj = kobject_create_and_add(name, &dev->kobj); 1261 if (!b->kobj) { 1262 err = -EINVAL; 1263 goto out_free; 1264 } 1265 1266 if (is_shared_bank(bank)) { 1267 b->shared = 1; 1268 refcount_set(&b->cpus, 1); 1269 1270 /* nb is already initialized, see above */ 1271 if (nb) { 1272 WARN_ON(nb->bank4); 1273 nb->bank4 = b; 1274 } 1275 } 1276 1277 err = allocate_threshold_blocks(cpu, b, bank, 0, mca_msr_reg(bank, MCA_MISC)); 1278 if (err) 1279 goto out_kobj; 1280 1281 bp[bank] = b; 1282 return 0; 1283 1284 out_kobj: 1285 kobject_put(b->kobj); 1286 out_free: 1287 kfree(b); 1288 out: 1289 return err; 1290 } 1291 1292 static void threshold_block_release(struct kobject *kobj) 1293 { 1294 kfree(to_block(kobj)); 1295 } 1296 1297 static void deallocate_threshold_blocks(struct threshold_bank *bank) 1298 { 1299 struct threshold_block *pos, *tmp; 1300 1301 list_for_each_entry_safe(pos, tmp, &bank->blocks->miscj, miscj) { 1302 list_del(&pos->miscj); 1303 kobject_put(&pos->kobj); 1304 } 1305 1306 kobject_put(&bank->blocks->kobj); 1307 } 1308 1309 static void __threshold_remove_blocks(struct threshold_bank *b) 1310 { 1311 struct threshold_block *pos = NULL; 1312 struct threshold_block *tmp = NULL; 1313 1314 kobject_put(b->kobj); 1315 1316 list_for_each_entry_safe(pos, tmp, &b->blocks->miscj, miscj) 1317 kobject_put(b->kobj); 1318 } 1319 1320 static void threshold_remove_bank(struct threshold_bank *bank) 1321 { 1322 struct amd_northbridge *nb; 1323 1324 if (!bank->blocks) 1325 goto out_free; 1326 1327 if (!bank->shared) 1328 goto out_dealloc; 1329 1330 if (!refcount_dec_and_test(&bank->cpus)) { 1331 __threshold_remove_blocks(bank); 1332 return; 1333 } else { 1334 /* 1335 * The last CPU on this node using the shared bank is going 1336 * away, remove that bank now. 1337 */ 1338 nb = node_to_amd_nb(topology_amd_node_id(smp_processor_id())); 1339 nb->bank4 = NULL; 1340 } 1341 1342 out_dealloc: 1343 deallocate_threshold_blocks(bank); 1344 1345 out_free: 1346 kobject_put(bank->kobj); 1347 kfree(bank); 1348 } 1349 1350 static void __threshold_remove_device(struct threshold_bank **bp) 1351 { 1352 unsigned int bank, numbanks = this_cpu_read(mce_num_banks); 1353 1354 for (bank = 0; bank < numbanks; bank++) { 1355 if (!bp[bank]) 1356 continue; 1357 1358 threshold_remove_bank(bp[bank]); 1359 bp[bank] = NULL; 1360 } 1361 kfree(bp); 1362 } 1363 1364 int mce_threshold_remove_device(unsigned int cpu) 1365 { 1366 struct threshold_bank **bp = this_cpu_read(threshold_banks); 1367 1368 if (!bp) 1369 return 0; 1370 1371 /* 1372 * Clear the pointer before cleaning up, so that the interrupt won't 1373 * touch anything of this. 1374 */ 1375 this_cpu_write(threshold_banks, NULL); 1376 1377 __threshold_remove_device(bp); 1378 return 0; 1379 } 1380 1381 /** 1382 * mce_threshold_create_device - Create the per-CPU MCE threshold device 1383 * @cpu: The plugged in CPU 1384 * 1385 * Create directories and files for all valid threshold banks. 1386 * 1387 * This is invoked from the CPU hotplug callback which was installed in 1388 * mcheck_init_device(). The invocation happens in context of the hotplug 1389 * thread running on @cpu. The callback is invoked on all CPUs which are 1390 * online when the callback is installed or during a real hotplug event. 1391 */ 1392 int mce_threshold_create_device(unsigned int cpu) 1393 { 1394 unsigned int numbanks, bank; 1395 struct threshold_bank **bp; 1396 int err; 1397 1398 if (!mce_flags.amd_threshold) 1399 return 0; 1400 1401 bp = this_cpu_read(threshold_banks); 1402 if (bp) 1403 return 0; 1404 1405 numbanks = this_cpu_read(mce_num_banks); 1406 bp = kcalloc(numbanks, sizeof(*bp), GFP_KERNEL); 1407 if (!bp) 1408 return -ENOMEM; 1409 1410 for (bank = 0; bank < numbanks; ++bank) { 1411 if (!(this_cpu_read(bank_map) & BIT_ULL(bank))) 1412 continue; 1413 err = threshold_create_bank(bp, cpu, bank); 1414 if (err) { 1415 __threshold_remove_device(bp); 1416 return err; 1417 } 1418 } 1419 this_cpu_write(threshold_banks, bp); 1420 1421 if (thresholding_irq_en) 1422 mce_threshold_vector = amd_threshold_interrupt; 1423 return 0; 1424 } 1425