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 struct smca_bank_name { 75 const char *name; /* Short name for sysfs */ 76 const char *long_name; /* Long name for pretty-printing */ 77 }; 78 79 static struct smca_bank_name smca_names[] = { 80 [SMCA_LS] = { "load_store", "Load Store Unit" }, 81 [SMCA_LS_V2] = { "load_store", "Load Store Unit" }, 82 [SMCA_IF] = { "insn_fetch", "Instruction Fetch Unit" }, 83 [SMCA_L2_CACHE] = { "l2_cache", "L2 Cache" }, 84 [SMCA_DE] = { "decode_unit", "Decode Unit" }, 85 [SMCA_RESERVED] = { "reserved", "Reserved" }, 86 [SMCA_EX] = { "execution_unit", "Execution Unit" }, 87 [SMCA_FP] = { "floating_point", "Floating Point Unit" }, 88 [SMCA_L3_CACHE] = { "l3_cache", "L3 Cache" }, 89 [SMCA_CS] = { "coherent_slave", "Coherent Slave" }, 90 [SMCA_CS_V2] = { "coherent_slave", "Coherent Slave" }, 91 [SMCA_PIE] = { "pie", "Power, Interrupts, etc." }, 92 [SMCA_UMC] = { "umc", "Unified Memory Controller" }, 93 [SMCA_PB] = { "param_block", "Parameter Block" }, 94 [SMCA_PSP] = { "psp", "Platform Security Processor" }, 95 [SMCA_PSP_V2] = { "psp", "Platform Security Processor" }, 96 [SMCA_SMU] = { "smu", "System Management Unit" }, 97 [SMCA_SMU_V2] = { "smu", "System Management Unit" }, 98 [SMCA_MP5] = { "mp5", "Microprocessor 5 Unit" }, 99 [SMCA_NBIO] = { "nbio", "Northbridge IO Unit" }, 100 [SMCA_PCIE] = { "pcie", "PCI Express Unit" }, 101 }; 102 103 static const char *smca_get_name(enum smca_bank_types t) 104 { 105 if (t >= N_SMCA_BANK_TYPES) 106 return NULL; 107 108 return smca_names[t].name; 109 } 110 111 const char *smca_get_long_name(enum smca_bank_types t) 112 { 113 if (t >= N_SMCA_BANK_TYPES) 114 return NULL; 115 116 return smca_names[t].long_name; 117 } 118 EXPORT_SYMBOL_GPL(smca_get_long_name); 119 120 static enum smca_bank_types smca_get_bank_type(unsigned int bank) 121 { 122 struct smca_bank *b; 123 124 if (bank >= MAX_NR_BANKS) 125 return N_SMCA_BANK_TYPES; 126 127 b = &smca_banks[bank]; 128 if (!b->hwid) 129 return N_SMCA_BANK_TYPES; 130 131 return b->hwid->bank_type; 132 } 133 134 static struct smca_hwid smca_hwid_mcatypes[] = { 135 /* { bank_type, hwid_mcatype, xec_bitmap } */ 136 137 /* Reserved type */ 138 { SMCA_RESERVED, HWID_MCATYPE(0x00, 0x0), 0x0 }, 139 140 /* ZN Core (HWID=0xB0) MCA types */ 141 { SMCA_LS, HWID_MCATYPE(0xB0, 0x0), 0x1FFFFF }, 142 { SMCA_LS_V2, HWID_MCATYPE(0xB0, 0x10), 0xFFFFFF }, 143 { SMCA_IF, HWID_MCATYPE(0xB0, 0x1), 0x3FFF }, 144 { SMCA_L2_CACHE, HWID_MCATYPE(0xB0, 0x2), 0xF }, 145 { SMCA_DE, HWID_MCATYPE(0xB0, 0x3), 0x1FF }, 146 /* HWID 0xB0 MCATYPE 0x4 is Reserved */ 147 { SMCA_EX, HWID_MCATYPE(0xB0, 0x5), 0xFFF }, 148 { SMCA_FP, HWID_MCATYPE(0xB0, 0x6), 0x7F }, 149 { SMCA_L3_CACHE, HWID_MCATYPE(0xB0, 0x7), 0xFF }, 150 151 /* Data Fabric MCA types */ 152 { SMCA_CS, HWID_MCATYPE(0x2E, 0x0), 0x1FF }, 153 { SMCA_PIE, HWID_MCATYPE(0x2E, 0x1), 0x1F }, 154 { SMCA_CS_V2, HWID_MCATYPE(0x2E, 0x2), 0x3FFF }, 155 156 /* Unified Memory Controller MCA type */ 157 { SMCA_UMC, HWID_MCATYPE(0x96, 0x0), 0xFF }, 158 159 /* Parameter Block MCA type */ 160 { SMCA_PB, HWID_MCATYPE(0x05, 0x0), 0x1 }, 161 162 /* Platform Security Processor MCA type */ 163 { SMCA_PSP, HWID_MCATYPE(0xFF, 0x0), 0x1 }, 164 { SMCA_PSP_V2, HWID_MCATYPE(0xFF, 0x1), 0x3FFFF }, 165 166 /* System Management Unit MCA type */ 167 { SMCA_SMU, HWID_MCATYPE(0x01, 0x0), 0x1 }, 168 { SMCA_SMU_V2, HWID_MCATYPE(0x01, 0x1), 0x7FF }, 169 170 /* Microprocessor 5 Unit MCA type */ 171 { SMCA_MP5, HWID_MCATYPE(0x01, 0x2), 0x3FF }, 172 173 /* Northbridge IO Unit MCA type */ 174 { SMCA_NBIO, HWID_MCATYPE(0x18, 0x0), 0x1F }, 175 176 /* PCI Express Unit MCA type */ 177 { SMCA_PCIE, HWID_MCATYPE(0x46, 0x0), 0x1F }, 178 }; 179 180 struct smca_bank smca_banks[MAX_NR_BANKS]; 181 EXPORT_SYMBOL_GPL(smca_banks); 182 183 /* 184 * In SMCA enabled processors, we can have multiple banks for a given IP type. 185 * So to define a unique name for each bank, we use a temp c-string to append 186 * the MCA_IPID[InstanceId] to type's name in get_name(). 187 * 188 * InstanceId is 32 bits which is 8 characters. Make sure MAX_MCATYPE_NAME_LEN 189 * is greater than 8 plus 1 (for underscore) plus length of longest type name. 190 */ 191 #define MAX_MCATYPE_NAME_LEN 30 192 static char buf_mcatype[MAX_MCATYPE_NAME_LEN]; 193 194 static DEFINE_PER_CPU(struct threshold_bank **, threshold_banks); 195 196 /* 197 * A list of the banks enabled on each logical CPU. Controls which respective 198 * descriptors to initialize later in mce_threshold_create_device(). 199 */ 200 static DEFINE_PER_CPU(unsigned int, bank_map); 201 202 /* Map of banks that have more than MCA_MISC0 available. */ 203 static DEFINE_PER_CPU(u32, smca_misc_banks_map); 204 205 static void amd_threshold_interrupt(void); 206 static void amd_deferred_error_interrupt(void); 207 208 static void default_deferred_error_interrupt(void) 209 { 210 pr_err("Unexpected deferred interrupt at vector %x\n", DEFERRED_ERROR_VECTOR); 211 } 212 void (*deferred_error_int_vector)(void) = default_deferred_error_interrupt; 213 214 static void smca_set_misc_banks_map(unsigned int bank, unsigned int cpu) 215 { 216 u32 low, high; 217 218 /* 219 * For SMCA enabled processors, BLKPTR field of the first MISC register 220 * (MCx_MISC0) indicates presence of additional MISC regs set (MISC1-4). 221 */ 222 if (rdmsr_safe(MSR_AMD64_SMCA_MCx_CONFIG(bank), &low, &high)) 223 return; 224 225 if (!(low & MCI_CONFIG_MCAX)) 226 return; 227 228 if (rdmsr_safe(MSR_AMD64_SMCA_MCx_MISC(bank), &low, &high)) 229 return; 230 231 if (low & MASK_BLKPTR_LO) 232 per_cpu(smca_misc_banks_map, cpu) |= BIT(bank); 233 234 } 235 236 static void smca_configure(unsigned int bank, unsigned int cpu) 237 { 238 unsigned int i, hwid_mcatype; 239 struct smca_hwid *s_hwid; 240 u32 high, low; 241 u32 smca_config = MSR_AMD64_SMCA_MCx_CONFIG(bank); 242 243 /* Set appropriate bits in MCA_CONFIG */ 244 if (!rdmsr_safe(smca_config, &low, &high)) { 245 /* 246 * OS is required to set the MCAX bit to acknowledge that it is 247 * now using the new MSR ranges and new registers under each 248 * bank. It also means that the OS will configure deferred 249 * errors in the new MCx_CONFIG register. If the bit is not set, 250 * uncorrectable errors will cause a system panic. 251 * 252 * MCA_CONFIG[MCAX] is bit 32 (0 in the high portion of the MSR.) 253 */ 254 high |= BIT(0); 255 256 /* 257 * SMCA sets the Deferred Error Interrupt type per bank. 258 * 259 * MCA_CONFIG[DeferredIntTypeSupported] is bit 5, and tells us 260 * if the DeferredIntType bit field is available. 261 * 262 * MCA_CONFIG[DeferredIntType] is bits [38:37] ([6:5] in the 263 * high portion of the MSR). OS should set this to 0x1 to enable 264 * APIC based interrupt. First, check that no interrupt has been 265 * set. 266 */ 267 if ((low & BIT(5)) && !((high >> 5) & 0x3)) 268 high |= BIT(5); 269 270 wrmsr(smca_config, low, high); 271 } 272 273 smca_set_misc_banks_map(bank, cpu); 274 275 /* Return early if this bank was already initialized. */ 276 if (smca_banks[bank].hwid && smca_banks[bank].hwid->hwid_mcatype != 0) 277 return; 278 279 if (rdmsr_safe(MSR_AMD64_SMCA_MCx_IPID(bank), &low, &high)) { 280 pr_warn("Failed to read MCA_IPID for bank %d\n", bank); 281 return; 282 } 283 284 hwid_mcatype = HWID_MCATYPE(high & MCI_IPID_HWID, 285 (high & MCI_IPID_MCATYPE) >> 16); 286 287 for (i = 0; i < ARRAY_SIZE(smca_hwid_mcatypes); i++) { 288 s_hwid = &smca_hwid_mcatypes[i]; 289 if (hwid_mcatype == s_hwid->hwid_mcatype) { 290 smca_banks[bank].hwid = s_hwid; 291 smca_banks[bank].id = low; 292 smca_banks[bank].sysfs_id = s_hwid->count++; 293 break; 294 } 295 } 296 } 297 298 struct thresh_restart { 299 struct threshold_block *b; 300 int reset; 301 int set_lvt_off; 302 int lvt_off; 303 u16 old_limit; 304 }; 305 306 static inline bool is_shared_bank(int bank) 307 { 308 /* 309 * Scalable MCA provides for only one core to have access to the MSRs of 310 * a shared bank. 311 */ 312 if (mce_flags.smca) 313 return false; 314 315 /* Bank 4 is for northbridge reporting and is thus shared */ 316 return (bank == 4); 317 } 318 319 static const char *bank4_names(const struct threshold_block *b) 320 { 321 switch (b->address) { 322 /* MSR4_MISC0 */ 323 case 0x00000413: 324 return "dram"; 325 326 case 0xc0000408: 327 return "ht_links"; 328 329 case 0xc0000409: 330 return "l3_cache"; 331 332 default: 333 WARN(1, "Funny MSR: 0x%08x\n", b->address); 334 return ""; 335 } 336 }; 337 338 339 static bool lvt_interrupt_supported(unsigned int bank, u32 msr_high_bits) 340 { 341 /* 342 * bank 4 supports APIC LVT interrupts implicitly since forever. 343 */ 344 if (bank == 4) 345 return true; 346 347 /* 348 * IntP: interrupt present; if this bit is set, the thresholding 349 * bank can generate APIC LVT interrupts 350 */ 351 return msr_high_bits & BIT(28); 352 } 353 354 static int lvt_off_valid(struct threshold_block *b, int apic, u32 lo, u32 hi) 355 { 356 int msr = (hi & MASK_LVTOFF_HI) >> 20; 357 358 if (apic < 0) { 359 pr_err(FW_BUG "cpu %d, failed to setup threshold interrupt " 360 "for bank %d, block %d (MSR%08X=0x%x%08x)\n", b->cpu, 361 b->bank, b->block, b->address, hi, lo); 362 return 0; 363 } 364 365 if (apic != msr) { 366 /* 367 * On SMCA CPUs, LVT offset is programmed at a different MSR, and 368 * the BIOS provides the value. The original field where LVT offset 369 * was set is reserved. Return early here: 370 */ 371 if (mce_flags.smca) 372 return 0; 373 374 pr_err(FW_BUG "cpu %d, invalid threshold interrupt offset %d " 375 "for bank %d, block %d (MSR%08X=0x%x%08x)\n", 376 b->cpu, apic, b->bank, b->block, b->address, hi, lo); 377 return 0; 378 } 379 380 return 1; 381 }; 382 383 /* Reprogram MCx_MISC MSR behind this threshold bank. */ 384 static void threshold_restart_bank(void *_tr) 385 { 386 struct thresh_restart *tr = _tr; 387 u32 hi, lo; 388 389 /* sysfs write might race against an offline operation */ 390 if (this_cpu_read(threshold_banks)) 391 return; 392 393 rdmsr(tr->b->address, lo, hi); 394 395 if (tr->b->threshold_limit < (hi & THRESHOLD_MAX)) 396 tr->reset = 1; /* limit cannot be lower than err count */ 397 398 if (tr->reset) { /* reset err count and overflow bit */ 399 hi = 400 (hi & ~(MASK_ERR_COUNT_HI | MASK_OVERFLOW_HI)) | 401 (THRESHOLD_MAX - tr->b->threshold_limit); 402 } else if (tr->old_limit) { /* change limit w/o reset */ 403 int new_count = (hi & THRESHOLD_MAX) + 404 (tr->old_limit - tr->b->threshold_limit); 405 406 hi = (hi & ~MASK_ERR_COUNT_HI) | 407 (new_count & THRESHOLD_MAX); 408 } 409 410 /* clear IntType */ 411 hi &= ~MASK_INT_TYPE_HI; 412 413 if (!tr->b->interrupt_capable) 414 goto done; 415 416 if (tr->set_lvt_off) { 417 if (lvt_off_valid(tr->b, tr->lvt_off, lo, hi)) { 418 /* set new lvt offset */ 419 hi &= ~MASK_LVTOFF_HI; 420 hi |= tr->lvt_off << 20; 421 } 422 } 423 424 if (tr->b->interrupt_enable) 425 hi |= INT_TYPE_APIC; 426 427 done: 428 429 hi |= MASK_COUNT_EN_HI; 430 wrmsr(tr->b->address, lo, hi); 431 } 432 433 static void mce_threshold_block_init(struct threshold_block *b, int offset) 434 { 435 struct thresh_restart tr = { 436 .b = b, 437 .set_lvt_off = 1, 438 .lvt_off = offset, 439 }; 440 441 b->threshold_limit = THRESHOLD_MAX; 442 threshold_restart_bank(&tr); 443 }; 444 445 static int setup_APIC_mce_threshold(int reserved, int new) 446 { 447 if (reserved < 0 && !setup_APIC_eilvt(new, THRESHOLD_APIC_VECTOR, 448 APIC_EILVT_MSG_FIX, 0)) 449 return new; 450 451 return reserved; 452 } 453 454 static int setup_APIC_deferred_error(int reserved, int new) 455 { 456 if (reserved < 0 && !setup_APIC_eilvt(new, DEFERRED_ERROR_VECTOR, 457 APIC_EILVT_MSG_FIX, 0)) 458 return new; 459 460 return reserved; 461 } 462 463 static void deferred_error_interrupt_enable(struct cpuinfo_x86 *c) 464 { 465 u32 low = 0, high = 0; 466 int def_offset = -1, def_new; 467 468 if (rdmsr_safe(MSR_CU_DEF_ERR, &low, &high)) 469 return; 470 471 def_new = (low & MASK_DEF_LVTOFF) >> 4; 472 if (!(low & MASK_DEF_LVTOFF)) { 473 pr_err(FW_BUG "Your BIOS is not setting up LVT offset 0x2 for deferred error IRQs correctly.\n"); 474 def_new = DEF_LVT_OFF; 475 low = (low & ~MASK_DEF_LVTOFF) | (DEF_LVT_OFF << 4); 476 } 477 478 def_offset = setup_APIC_deferred_error(def_offset, def_new); 479 if ((def_offset == def_new) && 480 (deferred_error_int_vector != amd_deferred_error_interrupt)) 481 deferred_error_int_vector = amd_deferred_error_interrupt; 482 483 if (!mce_flags.smca) 484 low = (low & ~MASK_DEF_INT_TYPE) | DEF_INT_TYPE_APIC; 485 486 wrmsr(MSR_CU_DEF_ERR, low, high); 487 } 488 489 static u32 smca_get_block_address(unsigned int bank, unsigned int block, 490 unsigned int cpu) 491 { 492 if (!block) 493 return MSR_AMD64_SMCA_MCx_MISC(bank); 494 495 if (!(per_cpu(smca_misc_banks_map, cpu) & BIT(bank))) 496 return 0; 497 498 return MSR_AMD64_SMCA_MCx_MISCy(bank, block - 1); 499 } 500 501 static u32 get_block_address(u32 current_addr, u32 low, u32 high, 502 unsigned int bank, unsigned int block, 503 unsigned int cpu) 504 { 505 u32 addr = 0, offset = 0; 506 507 if ((bank >= per_cpu(mce_num_banks, cpu)) || (block >= NR_BLOCKS)) 508 return addr; 509 510 if (mce_flags.smca) 511 return smca_get_block_address(bank, block, cpu); 512 513 /* Fall back to method we used for older processors: */ 514 switch (block) { 515 case 0: 516 addr = msr_ops.misc(bank); 517 break; 518 case 1: 519 offset = ((low & MASK_BLKPTR_LO) >> 21); 520 if (offset) 521 addr = MCG_XBLK_ADDR + offset; 522 break; 523 default: 524 addr = ++current_addr; 525 } 526 return addr; 527 } 528 529 static int 530 prepare_threshold_block(unsigned int bank, unsigned int block, u32 addr, 531 int offset, u32 misc_high) 532 { 533 unsigned int cpu = smp_processor_id(); 534 u32 smca_low, smca_high; 535 struct threshold_block b; 536 int new; 537 538 if (!block) 539 per_cpu(bank_map, cpu) |= (1 << bank); 540 541 memset(&b, 0, sizeof(b)); 542 b.cpu = cpu; 543 b.bank = bank; 544 b.block = block; 545 b.address = addr; 546 b.interrupt_capable = lvt_interrupt_supported(bank, misc_high); 547 548 if (!b.interrupt_capable) 549 goto done; 550 551 b.interrupt_enable = 1; 552 553 if (!mce_flags.smca) { 554 new = (misc_high & MASK_LVTOFF_HI) >> 20; 555 goto set_offset; 556 } 557 558 /* Gather LVT offset for thresholding: */ 559 if (rdmsr_safe(MSR_CU_DEF_ERR, &smca_low, &smca_high)) 560 goto out; 561 562 new = (smca_low & SMCA_THR_LVT_OFF) >> 12; 563 564 set_offset: 565 offset = setup_APIC_mce_threshold(offset, new); 566 if (offset == new) 567 thresholding_irq_en = true; 568 569 done: 570 mce_threshold_block_init(&b, offset); 571 572 out: 573 return offset; 574 } 575 576 bool amd_filter_mce(struct mce *m) 577 { 578 enum smca_bank_types bank_type = smca_get_bank_type(m->bank); 579 struct cpuinfo_x86 *c = &boot_cpu_data; 580 581 /* See Family 17h Models 10h-2Fh Erratum #1114. */ 582 if (c->x86 == 0x17 && 583 c->x86_model >= 0x10 && c->x86_model <= 0x2F && 584 bank_type == SMCA_IF && XEC(m->status, 0x3f) == 10) 585 return true; 586 587 /* NB GART TLB error reporting is disabled by default. */ 588 if (c->x86 < 0x17) { 589 if (m->bank == 4 && XEC(m->status, 0x1f) == 0x5) 590 return true; 591 } 592 593 return false; 594 } 595 596 /* 597 * Turn off thresholding banks for the following conditions: 598 * - MC4_MISC thresholding is not supported on Family 0x15. 599 * - Prevent possible spurious interrupts from the IF bank on Family 0x17 600 * Models 0x10-0x2F due to Erratum #1114. 601 */ 602 static void disable_err_thresholding(struct cpuinfo_x86 *c, unsigned int bank) 603 { 604 int i, num_msrs; 605 u64 hwcr; 606 bool need_toggle; 607 u32 msrs[NR_BLOCKS]; 608 609 if (c->x86 == 0x15 && bank == 4) { 610 msrs[0] = 0x00000413; /* MC4_MISC0 */ 611 msrs[1] = 0xc0000408; /* MC4_MISC1 */ 612 num_msrs = 2; 613 } else if (c->x86 == 0x17 && 614 (c->x86_model >= 0x10 && c->x86_model <= 0x2F)) { 615 616 if (smca_get_bank_type(bank) != SMCA_IF) 617 return; 618 619 msrs[0] = MSR_AMD64_SMCA_MCx_MISC(bank); 620 num_msrs = 1; 621 } else { 622 return; 623 } 624 625 rdmsrl(MSR_K7_HWCR, hwcr); 626 627 /* McStatusWrEn has to be set */ 628 need_toggle = !(hwcr & BIT(18)); 629 if (need_toggle) 630 wrmsrl(MSR_K7_HWCR, hwcr | BIT(18)); 631 632 /* Clear CntP bit safely */ 633 for (i = 0; i < num_msrs; i++) 634 msr_clear_bit(msrs[i], 62); 635 636 /* restore old settings */ 637 if (need_toggle) 638 wrmsrl(MSR_K7_HWCR, hwcr); 639 } 640 641 /* cpu init entry point, called from mce.c with preempt off */ 642 void mce_amd_feature_init(struct cpuinfo_x86 *c) 643 { 644 unsigned int bank, block, cpu = smp_processor_id(); 645 u32 low = 0, high = 0, address = 0; 646 int offset = -1; 647 648 649 for (bank = 0; bank < this_cpu_read(mce_num_banks); ++bank) { 650 if (mce_flags.smca) 651 smca_configure(bank, cpu); 652 653 disable_err_thresholding(c, bank); 654 655 for (block = 0; block < NR_BLOCKS; ++block) { 656 address = get_block_address(address, low, high, bank, block, cpu); 657 if (!address) 658 break; 659 660 if (rdmsr_safe(address, &low, &high)) 661 break; 662 663 if (!(high & MASK_VALID_HI)) 664 continue; 665 666 if (!(high & MASK_CNTP_HI) || 667 (high & MASK_LOCKED_HI)) 668 continue; 669 670 offset = prepare_threshold_block(bank, block, address, offset, high); 671 } 672 } 673 674 if (mce_flags.succor) 675 deferred_error_interrupt_enable(c); 676 } 677 678 int umc_normaddr_to_sysaddr(u64 norm_addr, u16 nid, u8 umc, u64 *sys_addr) 679 { 680 u64 dram_base_addr, dram_limit_addr, dram_hole_base; 681 /* We start from the normalized address */ 682 u64 ret_addr = norm_addr; 683 684 u32 tmp; 685 686 u8 die_id_shift, die_id_mask, socket_id_shift, socket_id_mask; 687 u8 intlv_num_dies, intlv_num_chan, intlv_num_sockets; 688 u8 intlv_addr_sel, intlv_addr_bit; 689 u8 num_intlv_bits, hashed_bit; 690 u8 lgcy_mmio_hole_en, base = 0; 691 u8 cs_mask, cs_id = 0; 692 bool hash_enabled = false; 693 694 /* Read D18F0x1B4 (DramOffset), check if base 1 is used. */ 695 if (amd_df_indirect_read(nid, 0, 0x1B4, umc, &tmp)) 696 goto out_err; 697 698 /* Remove HiAddrOffset from normalized address, if enabled: */ 699 if (tmp & BIT(0)) { 700 u64 hi_addr_offset = (tmp & GENMASK_ULL(31, 20)) << 8; 701 702 if (norm_addr >= hi_addr_offset) { 703 ret_addr -= hi_addr_offset; 704 base = 1; 705 } 706 } 707 708 /* Read D18F0x110 (DramBaseAddress). */ 709 if (amd_df_indirect_read(nid, 0, 0x110 + (8 * base), umc, &tmp)) 710 goto out_err; 711 712 /* Check if address range is valid. */ 713 if (!(tmp & BIT(0))) { 714 pr_err("%s: Invalid DramBaseAddress range: 0x%x.\n", 715 __func__, tmp); 716 goto out_err; 717 } 718 719 lgcy_mmio_hole_en = tmp & BIT(1); 720 intlv_num_chan = (tmp >> 4) & 0xF; 721 intlv_addr_sel = (tmp >> 8) & 0x7; 722 dram_base_addr = (tmp & GENMASK_ULL(31, 12)) << 16; 723 724 /* {0, 1, 2, 3} map to address bits {8, 9, 10, 11} respectively */ 725 if (intlv_addr_sel > 3) { 726 pr_err("%s: Invalid interleave address select %d.\n", 727 __func__, intlv_addr_sel); 728 goto out_err; 729 } 730 731 /* Read D18F0x114 (DramLimitAddress). */ 732 if (amd_df_indirect_read(nid, 0, 0x114 + (8 * base), umc, &tmp)) 733 goto out_err; 734 735 intlv_num_sockets = (tmp >> 8) & 0x1; 736 intlv_num_dies = (tmp >> 10) & 0x3; 737 dram_limit_addr = ((tmp & GENMASK_ULL(31, 12)) << 16) | GENMASK_ULL(27, 0); 738 739 intlv_addr_bit = intlv_addr_sel + 8; 740 741 /* Re-use intlv_num_chan by setting it equal to log2(#channels) */ 742 switch (intlv_num_chan) { 743 case 0: intlv_num_chan = 0; break; 744 case 1: intlv_num_chan = 1; break; 745 case 3: intlv_num_chan = 2; break; 746 case 5: intlv_num_chan = 3; break; 747 case 7: intlv_num_chan = 4; break; 748 749 case 8: intlv_num_chan = 1; 750 hash_enabled = true; 751 break; 752 default: 753 pr_err("%s: Invalid number of interleaved channels %d.\n", 754 __func__, intlv_num_chan); 755 goto out_err; 756 } 757 758 num_intlv_bits = intlv_num_chan; 759 760 if (intlv_num_dies > 2) { 761 pr_err("%s: Invalid number of interleaved nodes/dies %d.\n", 762 __func__, intlv_num_dies); 763 goto out_err; 764 } 765 766 num_intlv_bits += intlv_num_dies; 767 768 /* Add a bit if sockets are interleaved. */ 769 num_intlv_bits += intlv_num_sockets; 770 771 /* Assert num_intlv_bits <= 4 */ 772 if (num_intlv_bits > 4) { 773 pr_err("%s: Invalid interleave bits %d.\n", 774 __func__, num_intlv_bits); 775 goto out_err; 776 } 777 778 if (num_intlv_bits > 0) { 779 u64 temp_addr_x, temp_addr_i, temp_addr_y; 780 u8 die_id_bit, sock_id_bit, cs_fabric_id; 781 782 /* 783 * Read FabricBlockInstanceInformation3_CS[BlockFabricID]. 784 * This is the fabric id for this coherent slave. Use 785 * umc/channel# as instance id of the coherent slave 786 * for FICAA. 787 */ 788 if (amd_df_indirect_read(nid, 0, 0x50, umc, &tmp)) 789 goto out_err; 790 791 cs_fabric_id = (tmp >> 8) & 0xFF; 792 die_id_bit = 0; 793 794 /* If interleaved over more than 1 channel: */ 795 if (intlv_num_chan) { 796 die_id_bit = intlv_num_chan; 797 cs_mask = (1 << die_id_bit) - 1; 798 cs_id = cs_fabric_id & cs_mask; 799 } 800 801 sock_id_bit = die_id_bit; 802 803 /* Read D18F1x208 (SystemFabricIdMask). */ 804 if (intlv_num_dies || intlv_num_sockets) 805 if (amd_df_indirect_read(nid, 1, 0x208, umc, &tmp)) 806 goto out_err; 807 808 /* If interleaved over more than 1 die. */ 809 if (intlv_num_dies) { 810 sock_id_bit = die_id_bit + intlv_num_dies; 811 die_id_shift = (tmp >> 24) & 0xF; 812 die_id_mask = (tmp >> 8) & 0xFF; 813 814 cs_id |= ((cs_fabric_id & die_id_mask) >> die_id_shift) << die_id_bit; 815 } 816 817 /* If interleaved over more than 1 socket. */ 818 if (intlv_num_sockets) { 819 socket_id_shift = (tmp >> 28) & 0xF; 820 socket_id_mask = (tmp >> 16) & 0xFF; 821 822 cs_id |= ((cs_fabric_id & socket_id_mask) >> socket_id_shift) << sock_id_bit; 823 } 824 825 /* 826 * The pre-interleaved address consists of XXXXXXIIIYYYYY 827 * where III is the ID for this CS, and XXXXXXYYYYY are the 828 * address bits from the post-interleaved address. 829 * "num_intlv_bits" has been calculated to tell us how many "I" 830 * bits there are. "intlv_addr_bit" tells us how many "Y" bits 831 * there are (where "I" starts). 832 */ 833 temp_addr_y = ret_addr & GENMASK_ULL(intlv_addr_bit-1, 0); 834 temp_addr_i = (cs_id << intlv_addr_bit); 835 temp_addr_x = (ret_addr & GENMASK_ULL(63, intlv_addr_bit)) << num_intlv_bits; 836 ret_addr = temp_addr_x | temp_addr_i | temp_addr_y; 837 } 838 839 /* Add dram base address */ 840 ret_addr += dram_base_addr; 841 842 /* If legacy MMIO hole enabled */ 843 if (lgcy_mmio_hole_en) { 844 if (amd_df_indirect_read(nid, 0, 0x104, umc, &tmp)) 845 goto out_err; 846 847 dram_hole_base = tmp & GENMASK(31, 24); 848 if (ret_addr >= dram_hole_base) 849 ret_addr += (BIT_ULL(32) - dram_hole_base); 850 } 851 852 if (hash_enabled) { 853 /* Save some parentheses and grab ls-bit at the end. */ 854 hashed_bit = (ret_addr >> 12) ^ 855 (ret_addr >> 18) ^ 856 (ret_addr >> 21) ^ 857 (ret_addr >> 30) ^ 858 cs_id; 859 860 hashed_bit &= BIT(0); 861 862 if (hashed_bit != ((ret_addr >> intlv_addr_bit) & BIT(0))) 863 ret_addr ^= BIT(intlv_addr_bit); 864 } 865 866 /* Is calculated system address is above DRAM limit address? */ 867 if (ret_addr > dram_limit_addr) 868 goto out_err; 869 870 *sys_addr = ret_addr; 871 return 0; 872 873 out_err: 874 return -EINVAL; 875 } 876 EXPORT_SYMBOL_GPL(umc_normaddr_to_sysaddr); 877 878 bool amd_mce_is_memory_error(struct mce *m) 879 { 880 /* ErrCodeExt[20:16] */ 881 u8 xec = (m->status >> 16) & 0x1f; 882 883 if (mce_flags.smca) 884 return smca_get_bank_type(m->bank) == SMCA_UMC && xec == 0x0; 885 886 return m->bank == 4 && xec == 0x8; 887 } 888 889 static void __log_error(unsigned int bank, u64 status, u64 addr, u64 misc) 890 { 891 struct mce m; 892 893 mce_setup(&m); 894 895 m.status = status; 896 m.misc = misc; 897 m.bank = bank; 898 m.tsc = rdtsc(); 899 900 if (m.status & MCI_STATUS_ADDRV) { 901 m.addr = addr; 902 903 /* 904 * Extract [55:<lsb>] where lsb is the least significant 905 * *valid* bit of the address bits. 906 */ 907 if (mce_flags.smca) { 908 u8 lsb = (m.addr >> 56) & 0x3f; 909 910 m.addr &= GENMASK_ULL(55, lsb); 911 } 912 } 913 914 if (mce_flags.smca) { 915 rdmsrl(MSR_AMD64_SMCA_MCx_IPID(bank), m.ipid); 916 917 if (m.status & MCI_STATUS_SYNDV) 918 rdmsrl(MSR_AMD64_SMCA_MCx_SYND(bank), m.synd); 919 } 920 921 mce_log(&m); 922 } 923 924 asmlinkage __visible void __irq_entry smp_deferred_error_interrupt(struct pt_regs *regs) 925 { 926 entering_irq(); 927 trace_deferred_error_apic_entry(DEFERRED_ERROR_VECTOR); 928 inc_irq_stat(irq_deferred_error_count); 929 deferred_error_int_vector(); 930 trace_deferred_error_apic_exit(DEFERRED_ERROR_VECTOR); 931 exiting_ack_irq(); 932 } 933 934 /* 935 * Returns true if the logged error is deferred. False, otherwise. 936 */ 937 static inline bool 938 _log_error_bank(unsigned int bank, u32 msr_stat, u32 msr_addr, u64 misc) 939 { 940 u64 status, addr = 0; 941 942 rdmsrl(msr_stat, status); 943 if (!(status & MCI_STATUS_VAL)) 944 return false; 945 946 if (status & MCI_STATUS_ADDRV) 947 rdmsrl(msr_addr, addr); 948 949 __log_error(bank, status, addr, misc); 950 951 wrmsrl(msr_stat, 0); 952 953 return status & MCI_STATUS_DEFERRED; 954 } 955 956 /* 957 * We have three scenarios for checking for Deferred errors: 958 * 959 * 1) Non-SMCA systems check MCA_STATUS and log error if found. 960 * 2) SMCA systems check MCA_STATUS. If error is found then log it and also 961 * clear MCA_DESTAT. 962 * 3) SMCA systems check MCA_DESTAT, if error was not found in MCA_STATUS, and 963 * log it. 964 */ 965 static void log_error_deferred(unsigned int bank) 966 { 967 bool defrd; 968 969 defrd = _log_error_bank(bank, msr_ops.status(bank), 970 msr_ops.addr(bank), 0); 971 972 if (!mce_flags.smca) 973 return; 974 975 /* Clear MCA_DESTAT if we logged the deferred error from MCA_STATUS. */ 976 if (defrd) { 977 wrmsrl(MSR_AMD64_SMCA_MCx_DESTAT(bank), 0); 978 return; 979 } 980 981 /* 982 * Only deferred errors are logged in MCA_DE{STAT,ADDR} so just check 983 * for a valid error. 984 */ 985 _log_error_bank(bank, MSR_AMD64_SMCA_MCx_DESTAT(bank), 986 MSR_AMD64_SMCA_MCx_DEADDR(bank), 0); 987 } 988 989 /* APIC interrupt handler for deferred errors */ 990 static void amd_deferred_error_interrupt(void) 991 { 992 unsigned int bank; 993 994 for (bank = 0; bank < this_cpu_read(mce_num_banks); ++bank) 995 log_error_deferred(bank); 996 } 997 998 static void log_error_thresholding(unsigned int bank, u64 misc) 999 { 1000 _log_error_bank(bank, msr_ops.status(bank), msr_ops.addr(bank), misc); 1001 } 1002 1003 static void log_and_reset_block(struct threshold_block *block) 1004 { 1005 struct thresh_restart tr; 1006 u32 low = 0, high = 0; 1007 1008 if (!block) 1009 return; 1010 1011 if (rdmsr_safe(block->address, &low, &high)) 1012 return; 1013 1014 if (!(high & MASK_OVERFLOW_HI)) 1015 return; 1016 1017 /* Log the MCE which caused the threshold event. */ 1018 log_error_thresholding(block->bank, ((u64)high << 32) | low); 1019 1020 /* Reset threshold block after logging error. */ 1021 memset(&tr, 0, sizeof(tr)); 1022 tr.b = block; 1023 threshold_restart_bank(&tr); 1024 } 1025 1026 /* 1027 * Threshold interrupt handler will service THRESHOLD_APIC_VECTOR. The interrupt 1028 * goes off when error_count reaches threshold_limit. 1029 */ 1030 static void amd_threshold_interrupt(void) 1031 { 1032 struct threshold_block *first_block = NULL, *block = NULL, *tmp = NULL; 1033 struct threshold_bank **bp = this_cpu_read(threshold_banks); 1034 unsigned int bank, cpu = smp_processor_id(); 1035 1036 /* 1037 * Validate that the threshold bank has been initialized already. The 1038 * handler is installed at boot time, but on a hotplug event the 1039 * interrupt might fire before the data has been initialized. 1040 */ 1041 if (!bp) 1042 return; 1043 1044 for (bank = 0; bank < this_cpu_read(mce_num_banks); ++bank) { 1045 if (!(per_cpu(bank_map, cpu) & (1 << bank))) 1046 continue; 1047 1048 first_block = bp[bank]->blocks; 1049 if (!first_block) 1050 continue; 1051 1052 /* 1053 * The first block is also the head of the list. Check it first 1054 * before iterating over the rest. 1055 */ 1056 log_and_reset_block(first_block); 1057 list_for_each_entry_safe(block, tmp, &first_block->miscj, miscj) 1058 log_and_reset_block(block); 1059 } 1060 } 1061 1062 /* 1063 * Sysfs Interface 1064 */ 1065 1066 struct threshold_attr { 1067 struct attribute attr; 1068 ssize_t (*show) (struct threshold_block *, char *); 1069 ssize_t (*store) (struct threshold_block *, const char *, size_t count); 1070 }; 1071 1072 #define SHOW_FIELDS(name) \ 1073 static ssize_t show_ ## name(struct threshold_block *b, char *buf) \ 1074 { \ 1075 return sprintf(buf, "%lu\n", (unsigned long) b->name); \ 1076 } 1077 SHOW_FIELDS(interrupt_enable) 1078 SHOW_FIELDS(threshold_limit) 1079 1080 static ssize_t 1081 store_interrupt_enable(struct threshold_block *b, const char *buf, size_t size) 1082 { 1083 struct thresh_restart tr; 1084 unsigned long new; 1085 1086 if (!b->interrupt_capable) 1087 return -EINVAL; 1088 1089 if (kstrtoul(buf, 0, &new) < 0) 1090 return -EINVAL; 1091 1092 b->interrupt_enable = !!new; 1093 1094 memset(&tr, 0, sizeof(tr)); 1095 tr.b = b; 1096 1097 if (smp_call_function_single(b->cpu, threshold_restart_bank, &tr, 1)) 1098 return -ENODEV; 1099 1100 return size; 1101 } 1102 1103 static ssize_t 1104 store_threshold_limit(struct threshold_block *b, const char *buf, size_t size) 1105 { 1106 struct thresh_restart tr; 1107 unsigned long new; 1108 1109 if (kstrtoul(buf, 0, &new) < 0) 1110 return -EINVAL; 1111 1112 if (new > THRESHOLD_MAX) 1113 new = THRESHOLD_MAX; 1114 if (new < 1) 1115 new = 1; 1116 1117 memset(&tr, 0, sizeof(tr)); 1118 tr.old_limit = b->threshold_limit; 1119 b->threshold_limit = new; 1120 tr.b = b; 1121 1122 if (smp_call_function_single(b->cpu, threshold_restart_bank, &tr, 1)) 1123 return -ENODEV; 1124 1125 return size; 1126 } 1127 1128 static ssize_t show_error_count(struct threshold_block *b, char *buf) 1129 { 1130 u32 lo, hi; 1131 1132 /* CPU might be offline by now */ 1133 if (rdmsr_on_cpu(b->cpu, b->address, &lo, &hi)) 1134 return -ENODEV; 1135 1136 return sprintf(buf, "%u\n", ((hi & THRESHOLD_MAX) - 1137 (THRESHOLD_MAX - b->threshold_limit))); 1138 } 1139 1140 static struct threshold_attr error_count = { 1141 .attr = {.name = __stringify(error_count), .mode = 0444 }, 1142 .show = show_error_count, 1143 }; 1144 1145 #define RW_ATTR(val) \ 1146 static struct threshold_attr val = { \ 1147 .attr = {.name = __stringify(val), .mode = 0644 }, \ 1148 .show = show_## val, \ 1149 .store = store_## val, \ 1150 }; 1151 1152 RW_ATTR(interrupt_enable); 1153 RW_ATTR(threshold_limit); 1154 1155 static struct attribute *default_attrs[] = { 1156 &threshold_limit.attr, 1157 &error_count.attr, 1158 NULL, /* possibly interrupt_enable if supported, see below */ 1159 NULL, 1160 }; 1161 1162 #define to_block(k) container_of(k, struct threshold_block, kobj) 1163 #define to_attr(a) container_of(a, struct threshold_attr, attr) 1164 1165 static ssize_t show(struct kobject *kobj, struct attribute *attr, char *buf) 1166 { 1167 struct threshold_block *b = to_block(kobj); 1168 struct threshold_attr *a = to_attr(attr); 1169 ssize_t ret; 1170 1171 ret = a->show ? a->show(b, buf) : -EIO; 1172 1173 return ret; 1174 } 1175 1176 static ssize_t store(struct kobject *kobj, struct attribute *attr, 1177 const char *buf, size_t count) 1178 { 1179 struct threshold_block *b = to_block(kobj); 1180 struct threshold_attr *a = to_attr(attr); 1181 ssize_t ret; 1182 1183 ret = a->store ? a->store(b, buf, count) : -EIO; 1184 1185 return ret; 1186 } 1187 1188 static const struct sysfs_ops threshold_ops = { 1189 .show = show, 1190 .store = store, 1191 }; 1192 1193 static void threshold_block_release(struct kobject *kobj); 1194 1195 static struct kobj_type threshold_ktype = { 1196 .sysfs_ops = &threshold_ops, 1197 .default_attrs = default_attrs, 1198 .release = threshold_block_release, 1199 }; 1200 1201 static const char *get_name(unsigned int bank, struct threshold_block *b) 1202 { 1203 enum smca_bank_types bank_type; 1204 1205 if (!mce_flags.smca) { 1206 if (b && bank == 4) 1207 return bank4_names(b); 1208 1209 return th_names[bank]; 1210 } 1211 1212 bank_type = smca_get_bank_type(bank); 1213 if (bank_type >= N_SMCA_BANK_TYPES) 1214 return NULL; 1215 1216 if (b && bank_type == SMCA_UMC) { 1217 if (b->block < ARRAY_SIZE(smca_umc_block_names)) 1218 return smca_umc_block_names[b->block]; 1219 return NULL; 1220 } 1221 1222 if (smca_banks[bank].hwid->count == 1) 1223 return smca_get_name(bank_type); 1224 1225 snprintf(buf_mcatype, MAX_MCATYPE_NAME_LEN, 1226 "%s_%x", smca_get_name(bank_type), 1227 smca_banks[bank].sysfs_id); 1228 return buf_mcatype; 1229 } 1230 1231 static int allocate_threshold_blocks(unsigned int cpu, struct threshold_bank *tb, 1232 unsigned int bank, unsigned int block, 1233 u32 address) 1234 { 1235 struct threshold_block *b = NULL; 1236 u32 low, high; 1237 int err; 1238 1239 if ((bank >= this_cpu_read(mce_num_banks)) || (block >= NR_BLOCKS)) 1240 return 0; 1241 1242 if (rdmsr_safe(address, &low, &high)) 1243 return 0; 1244 1245 if (!(high & MASK_VALID_HI)) { 1246 if (block) 1247 goto recurse; 1248 else 1249 return 0; 1250 } 1251 1252 if (!(high & MASK_CNTP_HI) || 1253 (high & MASK_LOCKED_HI)) 1254 goto recurse; 1255 1256 b = kzalloc(sizeof(struct threshold_block), GFP_KERNEL); 1257 if (!b) 1258 return -ENOMEM; 1259 1260 b->block = block; 1261 b->bank = bank; 1262 b->cpu = cpu; 1263 b->address = address; 1264 b->interrupt_enable = 0; 1265 b->interrupt_capable = lvt_interrupt_supported(bank, high); 1266 b->threshold_limit = THRESHOLD_MAX; 1267 1268 if (b->interrupt_capable) { 1269 threshold_ktype.default_attrs[2] = &interrupt_enable.attr; 1270 b->interrupt_enable = 1; 1271 } else { 1272 threshold_ktype.default_attrs[2] = NULL; 1273 } 1274 1275 INIT_LIST_HEAD(&b->miscj); 1276 1277 /* This is safe as @tb is not visible yet */ 1278 if (tb->blocks) 1279 list_add(&b->miscj, &tb->blocks->miscj); 1280 else 1281 tb->blocks = b; 1282 1283 err = kobject_init_and_add(&b->kobj, &threshold_ktype, tb->kobj, get_name(bank, b)); 1284 if (err) 1285 goto out_free; 1286 recurse: 1287 address = get_block_address(address, low, high, bank, ++block, cpu); 1288 if (!address) 1289 return 0; 1290 1291 err = allocate_threshold_blocks(cpu, tb, bank, block, address); 1292 if (err) 1293 goto out_free; 1294 1295 if (b) 1296 kobject_uevent(&b->kobj, KOBJ_ADD); 1297 1298 return 0; 1299 1300 out_free: 1301 if (b) { 1302 list_del(&b->miscj); 1303 kobject_put(&b->kobj); 1304 } 1305 return err; 1306 } 1307 1308 static int __threshold_add_blocks(struct threshold_bank *b) 1309 { 1310 struct list_head *head = &b->blocks->miscj; 1311 struct threshold_block *pos = NULL; 1312 struct threshold_block *tmp = NULL; 1313 int err = 0; 1314 1315 err = kobject_add(&b->blocks->kobj, b->kobj, b->blocks->kobj.name); 1316 if (err) 1317 return err; 1318 1319 list_for_each_entry_safe(pos, tmp, head, miscj) { 1320 1321 err = kobject_add(&pos->kobj, b->kobj, pos->kobj.name); 1322 if (err) { 1323 list_for_each_entry_safe_reverse(pos, tmp, head, miscj) 1324 kobject_del(&pos->kobj); 1325 1326 return err; 1327 } 1328 } 1329 return err; 1330 } 1331 1332 static int threshold_create_bank(struct threshold_bank **bp, unsigned int cpu, 1333 unsigned int bank) 1334 { 1335 struct device *dev = this_cpu_read(mce_device); 1336 struct amd_northbridge *nb = NULL; 1337 struct threshold_bank *b = NULL; 1338 const char *name = get_name(bank, NULL); 1339 int err = 0; 1340 1341 if (!dev) 1342 return -ENODEV; 1343 1344 if (is_shared_bank(bank)) { 1345 nb = node_to_amd_nb(amd_get_nb_id(cpu)); 1346 1347 /* threshold descriptor already initialized on this node? */ 1348 if (nb && nb->bank4) { 1349 /* yes, use it */ 1350 b = nb->bank4; 1351 err = kobject_add(b->kobj, &dev->kobj, name); 1352 if (err) 1353 goto out; 1354 1355 bp[bank] = b; 1356 refcount_inc(&b->cpus); 1357 1358 err = __threshold_add_blocks(b); 1359 1360 goto out; 1361 } 1362 } 1363 1364 b = kzalloc(sizeof(struct threshold_bank), GFP_KERNEL); 1365 if (!b) { 1366 err = -ENOMEM; 1367 goto out; 1368 } 1369 1370 /* Associate the bank with the per-CPU MCE device */ 1371 b->kobj = kobject_create_and_add(name, &dev->kobj); 1372 if (!b->kobj) { 1373 err = -EINVAL; 1374 goto out_free; 1375 } 1376 1377 if (is_shared_bank(bank)) { 1378 b->shared = 1; 1379 refcount_set(&b->cpus, 1); 1380 1381 /* nb is already initialized, see above */ 1382 if (nb) { 1383 WARN_ON(nb->bank4); 1384 nb->bank4 = b; 1385 } 1386 } 1387 1388 err = allocate_threshold_blocks(cpu, b, bank, 0, msr_ops.misc(bank)); 1389 if (err) 1390 goto out_kobj; 1391 1392 bp[bank] = b; 1393 return 0; 1394 1395 out_kobj: 1396 kobject_put(b->kobj); 1397 out_free: 1398 kfree(b); 1399 out: 1400 return err; 1401 } 1402 1403 static void threshold_block_release(struct kobject *kobj) 1404 { 1405 kfree(to_block(kobj)); 1406 } 1407 1408 static void deallocate_threshold_blocks(struct threshold_bank *bank) 1409 { 1410 struct threshold_block *pos, *tmp; 1411 1412 list_for_each_entry_safe(pos, tmp, &bank->blocks->miscj, miscj) { 1413 list_del(&pos->miscj); 1414 kobject_put(&pos->kobj); 1415 } 1416 1417 kobject_put(&bank->blocks->kobj); 1418 } 1419 1420 static void __threshold_remove_blocks(struct threshold_bank *b) 1421 { 1422 struct threshold_block *pos = NULL; 1423 struct threshold_block *tmp = NULL; 1424 1425 kobject_del(b->kobj); 1426 1427 list_for_each_entry_safe(pos, tmp, &b->blocks->miscj, miscj) 1428 kobject_del(&pos->kobj); 1429 } 1430 1431 static void threshold_remove_bank(struct threshold_bank *bank) 1432 { 1433 struct amd_northbridge *nb; 1434 1435 if (!bank->blocks) 1436 goto out_free; 1437 1438 if (!bank->shared) 1439 goto out_dealloc; 1440 1441 if (!refcount_dec_and_test(&bank->cpus)) { 1442 __threshold_remove_blocks(bank); 1443 return; 1444 } else { 1445 /* 1446 * The last CPU on this node using the shared bank is going 1447 * away, remove that bank now. 1448 */ 1449 nb = node_to_amd_nb(amd_get_nb_id(smp_processor_id())); 1450 nb->bank4 = NULL; 1451 } 1452 1453 out_dealloc: 1454 deallocate_threshold_blocks(bank); 1455 1456 out_free: 1457 kobject_put(bank->kobj); 1458 kfree(bank); 1459 } 1460 1461 int mce_threshold_remove_device(unsigned int cpu) 1462 { 1463 struct threshold_bank **bp = this_cpu_read(threshold_banks); 1464 unsigned int bank, numbanks = this_cpu_read(mce_num_banks); 1465 1466 if (!bp) 1467 return 0; 1468 1469 /* 1470 * Clear the pointer before cleaning up, so that the interrupt won't 1471 * touch anything of this. 1472 */ 1473 this_cpu_write(threshold_banks, NULL); 1474 1475 for (bank = 0; bank < numbanks; bank++) { 1476 if (bp[bank]) { 1477 threshold_remove_bank(bp[bank]); 1478 bp[bank] = NULL; 1479 } 1480 } 1481 kfree(bp); 1482 return 0; 1483 } 1484 1485 /** 1486 * mce_threshold_create_device - Create the per-CPU MCE threshold device 1487 * @cpu: The plugged in CPU 1488 * 1489 * Create directories and files for all valid threshold banks. 1490 * 1491 * This is invoked from the CPU hotplug callback which was installed in 1492 * mcheck_init_device(). The invocation happens in context of the hotplug 1493 * thread running on @cpu. The callback is invoked on all CPUs which are 1494 * online when the callback is installed or during a real hotplug event. 1495 */ 1496 int mce_threshold_create_device(unsigned int cpu) 1497 { 1498 unsigned int numbanks, bank; 1499 struct threshold_bank **bp; 1500 int err; 1501 1502 if (!mce_flags.amd_threshold) 1503 return 0; 1504 1505 bp = this_cpu_read(threshold_banks); 1506 if (bp) 1507 return 0; 1508 1509 numbanks = this_cpu_read(mce_num_banks); 1510 bp = kcalloc(numbanks, sizeof(*bp), GFP_KERNEL); 1511 if (!bp) 1512 return -ENOMEM; 1513 1514 for (bank = 0; bank < numbanks; ++bank) { 1515 if (!(this_cpu_read(bank_map) & (1 << bank))) 1516 continue; 1517 err = threshold_create_bank(bp, cpu, bank); 1518 if (err) 1519 goto out_err; 1520 } 1521 this_cpu_write(threshold_banks, bp); 1522 1523 if (thresholding_irq_en) 1524 mce_threshold_vector = amd_threshold_interrupt; 1525 return 0; 1526 out_err: 1527 mce_threshold_remove_device(cpu); 1528 return err; 1529 } 1530