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 const char *smca_get_name(enum smca_bank_types t) 105 { 106 if (t >= N_SMCA_BANK_TYPES) 107 return NULL; 108 109 return smca_names[t].name; 110 } 111 112 const char *smca_get_long_name(enum smca_bank_types t) 113 { 114 if (t >= N_SMCA_BANK_TYPES) 115 return NULL; 116 117 return smca_names[t].long_name; 118 } 119 EXPORT_SYMBOL_GPL(smca_get_long_name); 120 121 static enum smca_bank_types smca_get_bank_type(unsigned int bank) 122 { 123 struct smca_bank *b; 124 125 if (bank >= MAX_NR_BANKS) 126 return N_SMCA_BANK_TYPES; 127 128 b = &smca_banks[bank]; 129 if (!b->hwid) 130 return N_SMCA_BANK_TYPES; 131 132 return b->hwid->bank_type; 133 } 134 135 static struct smca_hwid smca_hwid_mcatypes[] = { 136 /* { bank_type, hwid_mcatype, xec_bitmap } */ 137 138 /* Reserved type */ 139 { SMCA_RESERVED, HWID_MCATYPE(0x00, 0x0), 0x0 }, 140 141 /* ZN Core (HWID=0xB0) MCA types */ 142 { SMCA_LS, HWID_MCATYPE(0xB0, 0x0), 0x1FFFFF }, 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 static DEFINE_PER_CPU(unsigned int, bank_map); /* see which banks are on */ 196 197 /* Map of banks that have more than MCA_MISC0 available. */ 198 static DEFINE_PER_CPU(u32, smca_misc_banks_map); 199 200 static void amd_threshold_interrupt(void); 201 static void amd_deferred_error_interrupt(void); 202 203 static void default_deferred_error_interrupt(void) 204 { 205 pr_err("Unexpected deferred interrupt at vector %x\n", DEFERRED_ERROR_VECTOR); 206 } 207 void (*deferred_error_int_vector)(void) = default_deferred_error_interrupt; 208 209 static void smca_set_misc_banks_map(unsigned int bank, unsigned int cpu) 210 { 211 u32 low, high; 212 213 /* 214 * For SMCA enabled processors, BLKPTR field of the first MISC register 215 * (MCx_MISC0) indicates presence of additional MISC regs set (MISC1-4). 216 */ 217 if (rdmsr_safe(MSR_AMD64_SMCA_MCx_CONFIG(bank), &low, &high)) 218 return; 219 220 if (!(low & MCI_CONFIG_MCAX)) 221 return; 222 223 if (rdmsr_safe(MSR_AMD64_SMCA_MCx_MISC(bank), &low, &high)) 224 return; 225 226 if (low & MASK_BLKPTR_LO) 227 per_cpu(smca_misc_banks_map, cpu) |= BIT(bank); 228 229 } 230 231 static void smca_configure(unsigned int bank, unsigned int cpu) 232 { 233 unsigned int i, hwid_mcatype; 234 struct smca_hwid *s_hwid; 235 u32 high, low; 236 u32 smca_config = MSR_AMD64_SMCA_MCx_CONFIG(bank); 237 238 /* Set appropriate bits in MCA_CONFIG */ 239 if (!rdmsr_safe(smca_config, &low, &high)) { 240 /* 241 * OS is required to set the MCAX bit to acknowledge that it is 242 * now using the new MSR ranges and new registers under each 243 * bank. It also means that the OS will configure deferred 244 * errors in the new MCx_CONFIG register. If the bit is not set, 245 * uncorrectable errors will cause a system panic. 246 * 247 * MCA_CONFIG[MCAX] is bit 32 (0 in the high portion of the MSR.) 248 */ 249 high |= BIT(0); 250 251 /* 252 * SMCA sets the Deferred Error Interrupt type per bank. 253 * 254 * MCA_CONFIG[DeferredIntTypeSupported] is bit 5, and tells us 255 * if the DeferredIntType bit field is available. 256 * 257 * MCA_CONFIG[DeferredIntType] is bits [38:37] ([6:5] in the 258 * high portion of the MSR). OS should set this to 0x1 to enable 259 * APIC based interrupt. First, check that no interrupt has been 260 * set. 261 */ 262 if ((low & BIT(5)) && !((high >> 5) & 0x3)) 263 high |= BIT(5); 264 265 wrmsr(smca_config, low, high); 266 } 267 268 smca_set_misc_banks_map(bank, cpu); 269 270 /* Return early if this bank was already initialized. */ 271 if (smca_banks[bank].hwid) 272 return; 273 274 if (rdmsr_safe_on_cpu(cpu, MSR_AMD64_SMCA_MCx_IPID(bank), &low, &high)) { 275 pr_warn("Failed to read MCA_IPID for bank %d\n", bank); 276 return; 277 } 278 279 hwid_mcatype = HWID_MCATYPE(high & MCI_IPID_HWID, 280 (high & MCI_IPID_MCATYPE) >> 16); 281 282 for (i = 0; i < ARRAY_SIZE(smca_hwid_mcatypes); i++) { 283 s_hwid = &smca_hwid_mcatypes[i]; 284 if (hwid_mcatype == s_hwid->hwid_mcatype) { 285 smca_banks[bank].hwid = s_hwid; 286 smca_banks[bank].id = low; 287 smca_banks[bank].sysfs_id = s_hwid->count++; 288 break; 289 } 290 } 291 } 292 293 struct thresh_restart { 294 struct threshold_block *b; 295 int reset; 296 int set_lvt_off; 297 int lvt_off; 298 u16 old_limit; 299 }; 300 301 static inline bool is_shared_bank(int bank) 302 { 303 /* 304 * Scalable MCA provides for only one core to have access to the MSRs of 305 * a shared bank. 306 */ 307 if (mce_flags.smca) 308 return false; 309 310 /* Bank 4 is for northbridge reporting and is thus shared */ 311 return (bank == 4); 312 } 313 314 static const char *bank4_names(const struct threshold_block *b) 315 { 316 switch (b->address) { 317 /* MSR4_MISC0 */ 318 case 0x00000413: 319 return "dram"; 320 321 case 0xc0000408: 322 return "ht_links"; 323 324 case 0xc0000409: 325 return "l3_cache"; 326 327 default: 328 WARN(1, "Funny MSR: 0x%08x\n", b->address); 329 return ""; 330 } 331 }; 332 333 334 static bool lvt_interrupt_supported(unsigned int bank, u32 msr_high_bits) 335 { 336 /* 337 * bank 4 supports APIC LVT interrupts implicitly since forever. 338 */ 339 if (bank == 4) 340 return true; 341 342 /* 343 * IntP: interrupt present; if this bit is set, the thresholding 344 * bank can generate APIC LVT interrupts 345 */ 346 return msr_high_bits & BIT(28); 347 } 348 349 static int lvt_off_valid(struct threshold_block *b, int apic, u32 lo, u32 hi) 350 { 351 int msr = (hi & MASK_LVTOFF_HI) >> 20; 352 353 if (apic < 0) { 354 pr_err(FW_BUG "cpu %d, failed to setup threshold interrupt " 355 "for bank %d, block %d (MSR%08X=0x%x%08x)\n", b->cpu, 356 b->bank, b->block, b->address, hi, lo); 357 return 0; 358 } 359 360 if (apic != msr) { 361 /* 362 * On SMCA CPUs, LVT offset is programmed at a different MSR, and 363 * the BIOS provides the value. The original field where LVT offset 364 * was set is reserved. Return early here: 365 */ 366 if (mce_flags.smca) 367 return 0; 368 369 pr_err(FW_BUG "cpu %d, invalid threshold interrupt offset %d " 370 "for bank %d, block %d (MSR%08X=0x%x%08x)\n", 371 b->cpu, apic, b->bank, b->block, b->address, hi, lo); 372 return 0; 373 } 374 375 return 1; 376 }; 377 378 /* Reprogram MCx_MISC MSR behind this threshold bank. */ 379 static void threshold_restart_bank(void *_tr) 380 { 381 struct thresh_restart *tr = _tr; 382 u32 hi, lo; 383 384 rdmsr(tr->b->address, lo, hi); 385 386 if (tr->b->threshold_limit < (hi & THRESHOLD_MAX)) 387 tr->reset = 1; /* limit cannot be lower than err count */ 388 389 if (tr->reset) { /* reset err count and overflow bit */ 390 hi = 391 (hi & ~(MASK_ERR_COUNT_HI | MASK_OVERFLOW_HI)) | 392 (THRESHOLD_MAX - tr->b->threshold_limit); 393 } else if (tr->old_limit) { /* change limit w/o reset */ 394 int new_count = (hi & THRESHOLD_MAX) + 395 (tr->old_limit - tr->b->threshold_limit); 396 397 hi = (hi & ~MASK_ERR_COUNT_HI) | 398 (new_count & THRESHOLD_MAX); 399 } 400 401 /* clear IntType */ 402 hi &= ~MASK_INT_TYPE_HI; 403 404 if (!tr->b->interrupt_capable) 405 goto done; 406 407 if (tr->set_lvt_off) { 408 if (lvt_off_valid(tr->b, tr->lvt_off, lo, hi)) { 409 /* set new lvt offset */ 410 hi &= ~MASK_LVTOFF_HI; 411 hi |= tr->lvt_off << 20; 412 } 413 } 414 415 if (tr->b->interrupt_enable) 416 hi |= INT_TYPE_APIC; 417 418 done: 419 420 hi |= MASK_COUNT_EN_HI; 421 wrmsr(tr->b->address, lo, hi); 422 } 423 424 static void mce_threshold_block_init(struct threshold_block *b, int offset) 425 { 426 struct thresh_restart tr = { 427 .b = b, 428 .set_lvt_off = 1, 429 .lvt_off = offset, 430 }; 431 432 b->threshold_limit = THRESHOLD_MAX; 433 threshold_restart_bank(&tr); 434 }; 435 436 static int setup_APIC_mce_threshold(int reserved, int new) 437 { 438 if (reserved < 0 && !setup_APIC_eilvt(new, THRESHOLD_APIC_VECTOR, 439 APIC_EILVT_MSG_FIX, 0)) 440 return new; 441 442 return reserved; 443 } 444 445 static int setup_APIC_deferred_error(int reserved, int new) 446 { 447 if (reserved < 0 && !setup_APIC_eilvt(new, DEFERRED_ERROR_VECTOR, 448 APIC_EILVT_MSG_FIX, 0)) 449 return new; 450 451 return reserved; 452 } 453 454 static void deferred_error_interrupt_enable(struct cpuinfo_x86 *c) 455 { 456 u32 low = 0, high = 0; 457 int def_offset = -1, def_new; 458 459 if (rdmsr_safe(MSR_CU_DEF_ERR, &low, &high)) 460 return; 461 462 def_new = (low & MASK_DEF_LVTOFF) >> 4; 463 if (!(low & MASK_DEF_LVTOFF)) { 464 pr_err(FW_BUG "Your BIOS is not setting up LVT offset 0x2 for deferred error IRQs correctly.\n"); 465 def_new = DEF_LVT_OFF; 466 low = (low & ~MASK_DEF_LVTOFF) | (DEF_LVT_OFF << 4); 467 } 468 469 def_offset = setup_APIC_deferred_error(def_offset, def_new); 470 if ((def_offset == def_new) && 471 (deferred_error_int_vector != amd_deferred_error_interrupt)) 472 deferred_error_int_vector = amd_deferred_error_interrupt; 473 474 if (!mce_flags.smca) 475 low = (low & ~MASK_DEF_INT_TYPE) | DEF_INT_TYPE_APIC; 476 477 wrmsr(MSR_CU_DEF_ERR, low, high); 478 } 479 480 static u32 smca_get_block_address(unsigned int bank, unsigned int block, 481 unsigned int cpu) 482 { 483 if (!block) 484 return MSR_AMD64_SMCA_MCx_MISC(bank); 485 486 if (!(per_cpu(smca_misc_banks_map, cpu) & BIT(bank))) 487 return 0; 488 489 return MSR_AMD64_SMCA_MCx_MISCy(bank, block - 1); 490 } 491 492 static u32 get_block_address(u32 current_addr, u32 low, u32 high, 493 unsigned int bank, unsigned int block, 494 unsigned int cpu) 495 { 496 u32 addr = 0, offset = 0; 497 498 if ((bank >= mca_cfg.banks) || (block >= NR_BLOCKS)) 499 return addr; 500 501 if (mce_flags.smca) 502 return smca_get_block_address(bank, block, cpu); 503 504 /* Fall back to method we used for older processors: */ 505 switch (block) { 506 case 0: 507 addr = msr_ops.misc(bank); 508 break; 509 case 1: 510 offset = ((low & MASK_BLKPTR_LO) >> 21); 511 if (offset) 512 addr = MCG_XBLK_ADDR + offset; 513 break; 514 default: 515 addr = ++current_addr; 516 } 517 return addr; 518 } 519 520 static int 521 prepare_threshold_block(unsigned int bank, unsigned int block, u32 addr, 522 int offset, u32 misc_high) 523 { 524 unsigned int cpu = smp_processor_id(); 525 u32 smca_low, smca_high; 526 struct threshold_block b; 527 int new; 528 529 if (!block) 530 per_cpu(bank_map, cpu) |= (1 << bank); 531 532 memset(&b, 0, sizeof(b)); 533 b.cpu = cpu; 534 b.bank = bank; 535 b.block = block; 536 b.address = addr; 537 b.interrupt_capable = lvt_interrupt_supported(bank, misc_high); 538 539 if (!b.interrupt_capable) 540 goto done; 541 542 b.interrupt_enable = 1; 543 544 if (!mce_flags.smca) { 545 new = (misc_high & MASK_LVTOFF_HI) >> 20; 546 goto set_offset; 547 } 548 549 /* Gather LVT offset for thresholding: */ 550 if (rdmsr_safe(MSR_CU_DEF_ERR, &smca_low, &smca_high)) 551 goto out; 552 553 new = (smca_low & SMCA_THR_LVT_OFF) >> 12; 554 555 set_offset: 556 offset = setup_APIC_mce_threshold(offset, new); 557 if (offset == new) 558 thresholding_irq_en = true; 559 560 done: 561 mce_threshold_block_init(&b, offset); 562 563 out: 564 return offset; 565 } 566 567 bool amd_filter_mce(struct mce *m) 568 { 569 enum smca_bank_types bank_type = smca_get_bank_type(m->bank); 570 struct cpuinfo_x86 *c = &boot_cpu_data; 571 u8 xec = (m->status >> 16) & 0x3F; 572 573 /* See Family 17h Models 10h-2Fh Erratum #1114. */ 574 if (c->x86 == 0x17 && 575 c->x86_model >= 0x10 && c->x86_model <= 0x2F && 576 bank_type == SMCA_IF && xec == 10) 577 return true; 578 579 return false; 580 } 581 582 /* 583 * Turn off thresholding banks for the following conditions: 584 * - MC4_MISC thresholding is not supported on Family 0x15. 585 * - Prevent possible spurious interrupts from the IF bank on Family 0x17 586 * Models 0x10-0x2F due to Erratum #1114. 587 */ 588 void disable_err_thresholding(struct cpuinfo_x86 *c, unsigned int bank) 589 { 590 int i, num_msrs; 591 u64 hwcr; 592 bool need_toggle; 593 u32 msrs[NR_BLOCKS]; 594 595 if (c->x86 == 0x15 && bank == 4) { 596 msrs[0] = 0x00000413; /* MC4_MISC0 */ 597 msrs[1] = 0xc0000408; /* MC4_MISC1 */ 598 num_msrs = 2; 599 } else if (c->x86 == 0x17 && 600 (c->x86_model >= 0x10 && c->x86_model <= 0x2F)) { 601 602 if (smca_get_bank_type(bank) != SMCA_IF) 603 return; 604 605 msrs[0] = MSR_AMD64_SMCA_MCx_MISC(bank); 606 num_msrs = 1; 607 } else { 608 return; 609 } 610 611 rdmsrl(MSR_K7_HWCR, hwcr); 612 613 /* McStatusWrEn has to be set */ 614 need_toggle = !(hwcr & BIT(18)); 615 if (need_toggle) 616 wrmsrl(MSR_K7_HWCR, hwcr | BIT(18)); 617 618 /* Clear CntP bit safely */ 619 for (i = 0; i < num_msrs; i++) 620 msr_clear_bit(msrs[i], 62); 621 622 /* restore old settings */ 623 if (need_toggle) 624 wrmsrl(MSR_K7_HWCR, hwcr); 625 } 626 627 /* cpu init entry point, called from mce.c with preempt off */ 628 void mce_amd_feature_init(struct cpuinfo_x86 *c) 629 { 630 u32 low = 0, high = 0, address = 0; 631 unsigned int bank, block, cpu = smp_processor_id(); 632 int offset = -1; 633 634 for (bank = 0; bank < mca_cfg.banks; ++bank) { 635 if (mce_flags.smca) 636 smca_configure(bank, cpu); 637 638 disable_err_thresholding(c, bank); 639 640 for (block = 0; block < NR_BLOCKS; ++block) { 641 address = get_block_address(address, low, high, bank, block, cpu); 642 if (!address) 643 break; 644 645 if (rdmsr_safe(address, &low, &high)) 646 break; 647 648 if (!(high & MASK_VALID_HI)) 649 continue; 650 651 if (!(high & MASK_CNTP_HI) || 652 (high & MASK_LOCKED_HI)) 653 continue; 654 655 offset = prepare_threshold_block(bank, block, address, offset, high); 656 } 657 } 658 659 if (mce_flags.succor) 660 deferred_error_interrupt_enable(c); 661 } 662 663 int umc_normaddr_to_sysaddr(u64 norm_addr, u16 nid, u8 umc, u64 *sys_addr) 664 { 665 u64 dram_base_addr, dram_limit_addr, dram_hole_base; 666 /* We start from the normalized address */ 667 u64 ret_addr = norm_addr; 668 669 u32 tmp; 670 671 u8 die_id_shift, die_id_mask, socket_id_shift, socket_id_mask; 672 u8 intlv_num_dies, intlv_num_chan, intlv_num_sockets; 673 u8 intlv_addr_sel, intlv_addr_bit; 674 u8 num_intlv_bits, hashed_bit; 675 u8 lgcy_mmio_hole_en, base = 0; 676 u8 cs_mask, cs_id = 0; 677 bool hash_enabled = false; 678 679 /* Read D18F0x1B4 (DramOffset), check if base 1 is used. */ 680 if (amd_df_indirect_read(nid, 0, 0x1B4, umc, &tmp)) 681 goto out_err; 682 683 /* Remove HiAddrOffset from normalized address, if enabled: */ 684 if (tmp & BIT(0)) { 685 u64 hi_addr_offset = (tmp & GENMASK_ULL(31, 20)) << 8; 686 687 if (norm_addr >= hi_addr_offset) { 688 ret_addr -= hi_addr_offset; 689 base = 1; 690 } 691 } 692 693 /* Read D18F0x110 (DramBaseAddress). */ 694 if (amd_df_indirect_read(nid, 0, 0x110 + (8 * base), umc, &tmp)) 695 goto out_err; 696 697 /* Check if address range is valid. */ 698 if (!(tmp & BIT(0))) { 699 pr_err("%s: Invalid DramBaseAddress range: 0x%x.\n", 700 __func__, tmp); 701 goto out_err; 702 } 703 704 lgcy_mmio_hole_en = tmp & BIT(1); 705 intlv_num_chan = (tmp >> 4) & 0xF; 706 intlv_addr_sel = (tmp >> 8) & 0x7; 707 dram_base_addr = (tmp & GENMASK_ULL(31, 12)) << 16; 708 709 /* {0, 1, 2, 3} map to address bits {8, 9, 10, 11} respectively */ 710 if (intlv_addr_sel > 3) { 711 pr_err("%s: Invalid interleave address select %d.\n", 712 __func__, intlv_addr_sel); 713 goto out_err; 714 } 715 716 /* Read D18F0x114 (DramLimitAddress). */ 717 if (amd_df_indirect_read(nid, 0, 0x114 + (8 * base), umc, &tmp)) 718 goto out_err; 719 720 intlv_num_sockets = (tmp >> 8) & 0x1; 721 intlv_num_dies = (tmp >> 10) & 0x3; 722 dram_limit_addr = ((tmp & GENMASK_ULL(31, 12)) << 16) | GENMASK_ULL(27, 0); 723 724 intlv_addr_bit = intlv_addr_sel + 8; 725 726 /* Re-use intlv_num_chan by setting it equal to log2(#channels) */ 727 switch (intlv_num_chan) { 728 case 0: intlv_num_chan = 0; break; 729 case 1: intlv_num_chan = 1; break; 730 case 3: intlv_num_chan = 2; break; 731 case 5: intlv_num_chan = 3; break; 732 case 7: intlv_num_chan = 4; break; 733 734 case 8: intlv_num_chan = 1; 735 hash_enabled = true; 736 break; 737 default: 738 pr_err("%s: Invalid number of interleaved channels %d.\n", 739 __func__, intlv_num_chan); 740 goto out_err; 741 } 742 743 num_intlv_bits = intlv_num_chan; 744 745 if (intlv_num_dies > 2) { 746 pr_err("%s: Invalid number of interleaved nodes/dies %d.\n", 747 __func__, intlv_num_dies); 748 goto out_err; 749 } 750 751 num_intlv_bits += intlv_num_dies; 752 753 /* Add a bit if sockets are interleaved. */ 754 num_intlv_bits += intlv_num_sockets; 755 756 /* Assert num_intlv_bits <= 4 */ 757 if (num_intlv_bits > 4) { 758 pr_err("%s: Invalid interleave bits %d.\n", 759 __func__, num_intlv_bits); 760 goto out_err; 761 } 762 763 if (num_intlv_bits > 0) { 764 u64 temp_addr_x, temp_addr_i, temp_addr_y; 765 u8 die_id_bit, sock_id_bit, cs_fabric_id; 766 767 /* 768 * Read FabricBlockInstanceInformation3_CS[BlockFabricID]. 769 * This is the fabric id for this coherent slave. Use 770 * umc/channel# as instance id of the coherent slave 771 * for FICAA. 772 */ 773 if (amd_df_indirect_read(nid, 0, 0x50, umc, &tmp)) 774 goto out_err; 775 776 cs_fabric_id = (tmp >> 8) & 0xFF; 777 die_id_bit = 0; 778 779 /* If interleaved over more than 1 channel: */ 780 if (intlv_num_chan) { 781 die_id_bit = intlv_num_chan; 782 cs_mask = (1 << die_id_bit) - 1; 783 cs_id = cs_fabric_id & cs_mask; 784 } 785 786 sock_id_bit = die_id_bit; 787 788 /* Read D18F1x208 (SystemFabricIdMask). */ 789 if (intlv_num_dies || intlv_num_sockets) 790 if (amd_df_indirect_read(nid, 1, 0x208, umc, &tmp)) 791 goto out_err; 792 793 /* If interleaved over more than 1 die. */ 794 if (intlv_num_dies) { 795 sock_id_bit = die_id_bit + intlv_num_dies; 796 die_id_shift = (tmp >> 24) & 0xF; 797 die_id_mask = (tmp >> 8) & 0xFF; 798 799 cs_id |= ((cs_fabric_id & die_id_mask) >> die_id_shift) << die_id_bit; 800 } 801 802 /* If interleaved over more than 1 socket. */ 803 if (intlv_num_sockets) { 804 socket_id_shift = (tmp >> 28) & 0xF; 805 socket_id_mask = (tmp >> 16) & 0xFF; 806 807 cs_id |= ((cs_fabric_id & socket_id_mask) >> socket_id_shift) << sock_id_bit; 808 } 809 810 /* 811 * The pre-interleaved address consists of XXXXXXIIIYYYYY 812 * where III is the ID for this CS, and XXXXXXYYYYY are the 813 * address bits from the post-interleaved address. 814 * "num_intlv_bits" has been calculated to tell us how many "I" 815 * bits there are. "intlv_addr_bit" tells us how many "Y" bits 816 * there are (where "I" starts). 817 */ 818 temp_addr_y = ret_addr & GENMASK_ULL(intlv_addr_bit-1, 0); 819 temp_addr_i = (cs_id << intlv_addr_bit); 820 temp_addr_x = (ret_addr & GENMASK_ULL(63, intlv_addr_bit)) << num_intlv_bits; 821 ret_addr = temp_addr_x | temp_addr_i | temp_addr_y; 822 } 823 824 /* Add dram base address */ 825 ret_addr += dram_base_addr; 826 827 /* If legacy MMIO hole enabled */ 828 if (lgcy_mmio_hole_en) { 829 if (amd_df_indirect_read(nid, 0, 0x104, umc, &tmp)) 830 goto out_err; 831 832 dram_hole_base = tmp & GENMASK(31, 24); 833 if (ret_addr >= dram_hole_base) 834 ret_addr += (BIT_ULL(32) - dram_hole_base); 835 } 836 837 if (hash_enabled) { 838 /* Save some parentheses and grab ls-bit at the end. */ 839 hashed_bit = (ret_addr >> 12) ^ 840 (ret_addr >> 18) ^ 841 (ret_addr >> 21) ^ 842 (ret_addr >> 30) ^ 843 cs_id; 844 845 hashed_bit &= BIT(0); 846 847 if (hashed_bit != ((ret_addr >> intlv_addr_bit) & BIT(0))) 848 ret_addr ^= BIT(intlv_addr_bit); 849 } 850 851 /* Is calculated system address is above DRAM limit address? */ 852 if (ret_addr > dram_limit_addr) 853 goto out_err; 854 855 *sys_addr = ret_addr; 856 return 0; 857 858 out_err: 859 return -EINVAL; 860 } 861 EXPORT_SYMBOL_GPL(umc_normaddr_to_sysaddr); 862 863 bool amd_mce_is_memory_error(struct mce *m) 864 { 865 /* ErrCodeExt[20:16] */ 866 u8 xec = (m->status >> 16) & 0x1f; 867 868 if (mce_flags.smca) 869 return smca_get_bank_type(m->bank) == SMCA_UMC && xec == 0x0; 870 871 return m->bank == 4 && xec == 0x8; 872 } 873 874 static void __log_error(unsigned int bank, u64 status, u64 addr, u64 misc) 875 { 876 struct mce m; 877 878 mce_setup(&m); 879 880 m.status = status; 881 m.misc = misc; 882 m.bank = bank; 883 m.tsc = rdtsc(); 884 885 if (m.status & MCI_STATUS_ADDRV) { 886 m.addr = addr; 887 888 /* 889 * Extract [55:<lsb>] where lsb is the least significant 890 * *valid* bit of the address bits. 891 */ 892 if (mce_flags.smca) { 893 u8 lsb = (m.addr >> 56) & 0x3f; 894 895 m.addr &= GENMASK_ULL(55, lsb); 896 } 897 } 898 899 if (mce_flags.smca) { 900 rdmsrl(MSR_AMD64_SMCA_MCx_IPID(bank), m.ipid); 901 902 if (m.status & MCI_STATUS_SYNDV) 903 rdmsrl(MSR_AMD64_SMCA_MCx_SYND(bank), m.synd); 904 } 905 906 mce_log(&m); 907 } 908 909 asmlinkage __visible void __irq_entry smp_deferred_error_interrupt(struct pt_regs *regs) 910 { 911 entering_irq(); 912 trace_deferred_error_apic_entry(DEFERRED_ERROR_VECTOR); 913 inc_irq_stat(irq_deferred_error_count); 914 deferred_error_int_vector(); 915 trace_deferred_error_apic_exit(DEFERRED_ERROR_VECTOR); 916 exiting_ack_irq(); 917 } 918 919 /* 920 * Returns true if the logged error is deferred. False, otherwise. 921 */ 922 static inline bool 923 _log_error_bank(unsigned int bank, u32 msr_stat, u32 msr_addr, u64 misc) 924 { 925 u64 status, addr = 0; 926 927 rdmsrl(msr_stat, status); 928 if (!(status & MCI_STATUS_VAL)) 929 return false; 930 931 if (status & MCI_STATUS_ADDRV) 932 rdmsrl(msr_addr, addr); 933 934 __log_error(bank, status, addr, misc); 935 936 wrmsrl(msr_stat, 0); 937 938 return status & MCI_STATUS_DEFERRED; 939 } 940 941 /* 942 * We have three scenarios for checking for Deferred errors: 943 * 944 * 1) Non-SMCA systems check MCA_STATUS and log error if found. 945 * 2) SMCA systems check MCA_STATUS. If error is found then log it and also 946 * clear MCA_DESTAT. 947 * 3) SMCA systems check MCA_DESTAT, if error was not found in MCA_STATUS, and 948 * log it. 949 */ 950 static void log_error_deferred(unsigned int bank) 951 { 952 bool defrd; 953 954 defrd = _log_error_bank(bank, msr_ops.status(bank), 955 msr_ops.addr(bank), 0); 956 957 if (!mce_flags.smca) 958 return; 959 960 /* Clear MCA_DESTAT if we logged the deferred error from MCA_STATUS. */ 961 if (defrd) { 962 wrmsrl(MSR_AMD64_SMCA_MCx_DESTAT(bank), 0); 963 return; 964 } 965 966 /* 967 * Only deferred errors are logged in MCA_DE{STAT,ADDR} so just check 968 * for a valid error. 969 */ 970 _log_error_bank(bank, MSR_AMD64_SMCA_MCx_DESTAT(bank), 971 MSR_AMD64_SMCA_MCx_DEADDR(bank), 0); 972 } 973 974 /* APIC interrupt handler for deferred errors */ 975 static void amd_deferred_error_interrupt(void) 976 { 977 unsigned int bank; 978 979 for (bank = 0; bank < mca_cfg.banks; ++bank) 980 log_error_deferred(bank); 981 } 982 983 static void log_error_thresholding(unsigned int bank, u64 misc) 984 { 985 _log_error_bank(bank, msr_ops.status(bank), msr_ops.addr(bank), misc); 986 } 987 988 static void log_and_reset_block(struct threshold_block *block) 989 { 990 struct thresh_restart tr; 991 u32 low = 0, high = 0; 992 993 if (!block) 994 return; 995 996 if (rdmsr_safe(block->address, &low, &high)) 997 return; 998 999 if (!(high & MASK_OVERFLOW_HI)) 1000 return; 1001 1002 /* Log the MCE which caused the threshold event. */ 1003 log_error_thresholding(block->bank, ((u64)high << 32) | low); 1004 1005 /* Reset threshold block after logging error. */ 1006 memset(&tr, 0, sizeof(tr)); 1007 tr.b = block; 1008 threshold_restart_bank(&tr); 1009 } 1010 1011 /* 1012 * Threshold interrupt handler will service THRESHOLD_APIC_VECTOR. The interrupt 1013 * goes off when error_count reaches threshold_limit. 1014 */ 1015 static void amd_threshold_interrupt(void) 1016 { 1017 struct threshold_block *first_block = NULL, *block = NULL, *tmp = NULL; 1018 unsigned int bank, cpu = smp_processor_id(); 1019 1020 for (bank = 0; bank < mca_cfg.banks; ++bank) { 1021 if (!(per_cpu(bank_map, cpu) & (1 << bank))) 1022 continue; 1023 1024 first_block = per_cpu(threshold_banks, cpu)[bank]->blocks; 1025 if (!first_block) 1026 continue; 1027 1028 /* 1029 * The first block is also the head of the list. Check it first 1030 * before iterating over the rest. 1031 */ 1032 log_and_reset_block(first_block); 1033 list_for_each_entry_safe(block, tmp, &first_block->miscj, miscj) 1034 log_and_reset_block(block); 1035 } 1036 } 1037 1038 /* 1039 * Sysfs Interface 1040 */ 1041 1042 struct threshold_attr { 1043 struct attribute attr; 1044 ssize_t (*show) (struct threshold_block *, char *); 1045 ssize_t (*store) (struct threshold_block *, const char *, size_t count); 1046 }; 1047 1048 #define SHOW_FIELDS(name) \ 1049 static ssize_t show_ ## name(struct threshold_block *b, char *buf) \ 1050 { \ 1051 return sprintf(buf, "%lu\n", (unsigned long) b->name); \ 1052 } 1053 SHOW_FIELDS(interrupt_enable) 1054 SHOW_FIELDS(threshold_limit) 1055 1056 static ssize_t 1057 store_interrupt_enable(struct threshold_block *b, const char *buf, size_t size) 1058 { 1059 struct thresh_restart tr; 1060 unsigned long new; 1061 1062 if (!b->interrupt_capable) 1063 return -EINVAL; 1064 1065 if (kstrtoul(buf, 0, &new) < 0) 1066 return -EINVAL; 1067 1068 b->interrupt_enable = !!new; 1069 1070 memset(&tr, 0, sizeof(tr)); 1071 tr.b = b; 1072 1073 smp_call_function_single(b->cpu, threshold_restart_bank, &tr, 1); 1074 1075 return size; 1076 } 1077 1078 static ssize_t 1079 store_threshold_limit(struct threshold_block *b, const char *buf, size_t size) 1080 { 1081 struct thresh_restart tr; 1082 unsigned long new; 1083 1084 if (kstrtoul(buf, 0, &new) < 0) 1085 return -EINVAL; 1086 1087 if (new > THRESHOLD_MAX) 1088 new = THRESHOLD_MAX; 1089 if (new < 1) 1090 new = 1; 1091 1092 memset(&tr, 0, sizeof(tr)); 1093 tr.old_limit = b->threshold_limit; 1094 b->threshold_limit = new; 1095 tr.b = b; 1096 1097 smp_call_function_single(b->cpu, threshold_restart_bank, &tr, 1); 1098 1099 return size; 1100 } 1101 1102 static ssize_t show_error_count(struct threshold_block *b, char *buf) 1103 { 1104 u32 lo, hi; 1105 1106 rdmsr_on_cpu(b->cpu, b->address, &lo, &hi); 1107 1108 return sprintf(buf, "%u\n", ((hi & THRESHOLD_MAX) - 1109 (THRESHOLD_MAX - b->threshold_limit))); 1110 } 1111 1112 static struct threshold_attr error_count = { 1113 .attr = {.name = __stringify(error_count), .mode = 0444 }, 1114 .show = show_error_count, 1115 }; 1116 1117 #define RW_ATTR(val) \ 1118 static struct threshold_attr val = { \ 1119 .attr = {.name = __stringify(val), .mode = 0644 }, \ 1120 .show = show_## val, \ 1121 .store = store_## val, \ 1122 }; 1123 1124 RW_ATTR(interrupt_enable); 1125 RW_ATTR(threshold_limit); 1126 1127 static struct attribute *default_attrs[] = { 1128 &threshold_limit.attr, 1129 &error_count.attr, 1130 NULL, /* possibly interrupt_enable if supported, see below */ 1131 NULL, 1132 }; 1133 1134 #define to_block(k) container_of(k, struct threshold_block, kobj) 1135 #define to_attr(a) container_of(a, struct threshold_attr, attr) 1136 1137 static ssize_t show(struct kobject *kobj, struct attribute *attr, char *buf) 1138 { 1139 struct threshold_block *b = to_block(kobj); 1140 struct threshold_attr *a = to_attr(attr); 1141 ssize_t ret; 1142 1143 ret = a->show ? a->show(b, buf) : -EIO; 1144 1145 return ret; 1146 } 1147 1148 static ssize_t store(struct kobject *kobj, struct attribute *attr, 1149 const char *buf, size_t count) 1150 { 1151 struct threshold_block *b = to_block(kobj); 1152 struct threshold_attr *a = to_attr(attr); 1153 ssize_t ret; 1154 1155 ret = a->store ? a->store(b, buf, count) : -EIO; 1156 1157 return ret; 1158 } 1159 1160 static const struct sysfs_ops threshold_ops = { 1161 .show = show, 1162 .store = store, 1163 }; 1164 1165 static struct kobj_type threshold_ktype = { 1166 .sysfs_ops = &threshold_ops, 1167 .default_attrs = default_attrs, 1168 }; 1169 1170 static const char *get_name(unsigned int bank, struct threshold_block *b) 1171 { 1172 enum smca_bank_types bank_type; 1173 1174 if (!mce_flags.smca) { 1175 if (b && bank == 4) 1176 return bank4_names(b); 1177 1178 return th_names[bank]; 1179 } 1180 1181 bank_type = smca_get_bank_type(bank); 1182 if (bank_type >= N_SMCA_BANK_TYPES) 1183 return NULL; 1184 1185 if (b && bank_type == SMCA_UMC) { 1186 if (b->block < ARRAY_SIZE(smca_umc_block_names)) 1187 return smca_umc_block_names[b->block]; 1188 return NULL; 1189 } 1190 1191 if (smca_banks[bank].hwid->count == 1) 1192 return smca_get_name(bank_type); 1193 1194 snprintf(buf_mcatype, MAX_MCATYPE_NAME_LEN, 1195 "%s_%x", smca_get_name(bank_type), 1196 smca_banks[bank].sysfs_id); 1197 return buf_mcatype; 1198 } 1199 1200 static int allocate_threshold_blocks(unsigned int cpu, unsigned int bank, 1201 unsigned int block, u32 address) 1202 { 1203 struct threshold_block *b = NULL; 1204 u32 low, high; 1205 int err; 1206 1207 if ((bank >= mca_cfg.banks) || (block >= NR_BLOCKS)) 1208 return 0; 1209 1210 if (rdmsr_safe_on_cpu(cpu, address, &low, &high)) 1211 return 0; 1212 1213 if (!(high & MASK_VALID_HI)) { 1214 if (block) 1215 goto recurse; 1216 else 1217 return 0; 1218 } 1219 1220 if (!(high & MASK_CNTP_HI) || 1221 (high & MASK_LOCKED_HI)) 1222 goto recurse; 1223 1224 b = kzalloc(sizeof(struct threshold_block), GFP_KERNEL); 1225 if (!b) 1226 return -ENOMEM; 1227 1228 b->block = block; 1229 b->bank = bank; 1230 b->cpu = cpu; 1231 b->address = address; 1232 b->interrupt_enable = 0; 1233 b->interrupt_capable = lvt_interrupt_supported(bank, high); 1234 b->threshold_limit = THRESHOLD_MAX; 1235 1236 if (b->interrupt_capable) { 1237 threshold_ktype.default_attrs[2] = &interrupt_enable.attr; 1238 b->interrupt_enable = 1; 1239 } else { 1240 threshold_ktype.default_attrs[2] = NULL; 1241 } 1242 1243 INIT_LIST_HEAD(&b->miscj); 1244 1245 if (per_cpu(threshold_banks, cpu)[bank]->blocks) { 1246 list_add(&b->miscj, 1247 &per_cpu(threshold_banks, cpu)[bank]->blocks->miscj); 1248 } else { 1249 per_cpu(threshold_banks, cpu)[bank]->blocks = b; 1250 } 1251 1252 err = kobject_init_and_add(&b->kobj, &threshold_ktype, 1253 per_cpu(threshold_banks, cpu)[bank]->kobj, 1254 get_name(bank, b)); 1255 if (err) 1256 goto out_free; 1257 recurse: 1258 address = get_block_address(address, low, high, bank, ++block, cpu); 1259 if (!address) 1260 return 0; 1261 1262 err = allocate_threshold_blocks(cpu, bank, block, address); 1263 if (err) 1264 goto out_free; 1265 1266 if (b) 1267 kobject_uevent(&b->kobj, KOBJ_ADD); 1268 1269 return err; 1270 1271 out_free: 1272 if (b) { 1273 kobject_put(&b->kobj); 1274 list_del(&b->miscj); 1275 kfree(b); 1276 } 1277 return err; 1278 } 1279 1280 static int __threshold_add_blocks(struct threshold_bank *b) 1281 { 1282 struct list_head *head = &b->blocks->miscj; 1283 struct threshold_block *pos = NULL; 1284 struct threshold_block *tmp = NULL; 1285 int err = 0; 1286 1287 err = kobject_add(&b->blocks->kobj, b->kobj, b->blocks->kobj.name); 1288 if (err) 1289 return err; 1290 1291 list_for_each_entry_safe(pos, tmp, head, miscj) { 1292 1293 err = kobject_add(&pos->kobj, b->kobj, pos->kobj.name); 1294 if (err) { 1295 list_for_each_entry_safe_reverse(pos, tmp, head, miscj) 1296 kobject_del(&pos->kobj); 1297 1298 return err; 1299 } 1300 } 1301 return err; 1302 } 1303 1304 static int threshold_create_bank(unsigned int cpu, unsigned int bank) 1305 { 1306 struct device *dev = per_cpu(mce_device, cpu); 1307 struct amd_northbridge *nb = NULL; 1308 struct threshold_bank *b = NULL; 1309 const char *name = get_name(bank, NULL); 1310 int err = 0; 1311 1312 if (!dev) 1313 return -ENODEV; 1314 1315 if (is_shared_bank(bank)) { 1316 nb = node_to_amd_nb(amd_get_nb_id(cpu)); 1317 1318 /* threshold descriptor already initialized on this node? */ 1319 if (nb && nb->bank4) { 1320 /* yes, use it */ 1321 b = nb->bank4; 1322 err = kobject_add(b->kobj, &dev->kobj, name); 1323 if (err) 1324 goto out; 1325 1326 per_cpu(threshold_banks, cpu)[bank] = b; 1327 refcount_inc(&b->cpus); 1328 1329 err = __threshold_add_blocks(b); 1330 1331 goto out; 1332 } 1333 } 1334 1335 b = kzalloc(sizeof(struct threshold_bank), GFP_KERNEL); 1336 if (!b) { 1337 err = -ENOMEM; 1338 goto out; 1339 } 1340 1341 b->kobj = kobject_create_and_add(name, &dev->kobj); 1342 if (!b->kobj) { 1343 err = -EINVAL; 1344 goto out_free; 1345 } 1346 1347 per_cpu(threshold_banks, cpu)[bank] = b; 1348 1349 if (is_shared_bank(bank)) { 1350 refcount_set(&b->cpus, 1); 1351 1352 /* nb is already initialized, see above */ 1353 if (nb) { 1354 WARN_ON(nb->bank4); 1355 nb->bank4 = b; 1356 } 1357 } 1358 1359 err = allocate_threshold_blocks(cpu, bank, 0, msr_ops.misc(bank)); 1360 if (!err) 1361 goto out; 1362 1363 out_free: 1364 kfree(b); 1365 1366 out: 1367 return err; 1368 } 1369 1370 static void deallocate_threshold_block(unsigned int cpu, 1371 unsigned int bank) 1372 { 1373 struct threshold_block *pos = NULL; 1374 struct threshold_block *tmp = NULL; 1375 struct threshold_bank *head = per_cpu(threshold_banks, cpu)[bank]; 1376 1377 if (!head) 1378 return; 1379 1380 list_for_each_entry_safe(pos, tmp, &head->blocks->miscj, miscj) { 1381 kobject_put(&pos->kobj); 1382 list_del(&pos->miscj); 1383 kfree(pos); 1384 } 1385 1386 kfree(per_cpu(threshold_banks, cpu)[bank]->blocks); 1387 per_cpu(threshold_banks, cpu)[bank]->blocks = NULL; 1388 } 1389 1390 static void __threshold_remove_blocks(struct threshold_bank *b) 1391 { 1392 struct threshold_block *pos = NULL; 1393 struct threshold_block *tmp = NULL; 1394 1395 kobject_del(b->kobj); 1396 1397 list_for_each_entry_safe(pos, tmp, &b->blocks->miscj, miscj) 1398 kobject_del(&pos->kobj); 1399 } 1400 1401 static void threshold_remove_bank(unsigned int cpu, int bank) 1402 { 1403 struct amd_northbridge *nb; 1404 struct threshold_bank *b; 1405 1406 b = per_cpu(threshold_banks, cpu)[bank]; 1407 if (!b) 1408 return; 1409 1410 if (!b->blocks) 1411 goto free_out; 1412 1413 if (is_shared_bank(bank)) { 1414 if (!refcount_dec_and_test(&b->cpus)) { 1415 __threshold_remove_blocks(b); 1416 per_cpu(threshold_banks, cpu)[bank] = NULL; 1417 return; 1418 } else { 1419 /* 1420 * the last CPU on this node using the shared bank is 1421 * going away, remove that bank now. 1422 */ 1423 nb = node_to_amd_nb(amd_get_nb_id(cpu)); 1424 nb->bank4 = NULL; 1425 } 1426 } 1427 1428 deallocate_threshold_block(cpu, bank); 1429 1430 free_out: 1431 kobject_del(b->kobj); 1432 kobject_put(b->kobj); 1433 kfree(b); 1434 per_cpu(threshold_banks, cpu)[bank] = NULL; 1435 } 1436 1437 int mce_threshold_remove_device(unsigned int cpu) 1438 { 1439 unsigned int bank; 1440 1441 for (bank = 0; bank < mca_cfg.banks; ++bank) { 1442 if (!(per_cpu(bank_map, cpu) & (1 << bank))) 1443 continue; 1444 threshold_remove_bank(cpu, bank); 1445 } 1446 kfree(per_cpu(threshold_banks, cpu)); 1447 per_cpu(threshold_banks, cpu) = NULL; 1448 return 0; 1449 } 1450 1451 /* create dir/files for all valid threshold banks */ 1452 int mce_threshold_create_device(unsigned int cpu) 1453 { 1454 unsigned int bank; 1455 struct threshold_bank **bp; 1456 int err = 0; 1457 1458 bp = per_cpu(threshold_banks, cpu); 1459 if (bp) 1460 return 0; 1461 1462 bp = kcalloc(mca_cfg.banks, sizeof(struct threshold_bank *), 1463 GFP_KERNEL); 1464 if (!bp) 1465 return -ENOMEM; 1466 1467 per_cpu(threshold_banks, cpu) = bp; 1468 1469 for (bank = 0; bank < mca_cfg.banks; ++bank) { 1470 if (!(per_cpu(bank_map, cpu) & (1 << bank))) 1471 continue; 1472 err = threshold_create_bank(cpu, bank); 1473 if (err) 1474 goto err; 1475 } 1476 return err; 1477 err: 1478 mce_threshold_remove_device(cpu); 1479 return err; 1480 } 1481 1482 static __init int threshold_init_device(void) 1483 { 1484 unsigned lcpu = 0; 1485 1486 /* to hit CPUs online before the notifier is up */ 1487 for_each_online_cpu(lcpu) { 1488 int err = mce_threshold_create_device(lcpu); 1489 1490 if (err) 1491 return err; 1492 } 1493 1494 if (thresholding_irq_en) 1495 mce_threshold_vector = amd_threshold_interrupt; 1496 1497 return 0; 1498 } 1499 /* 1500 * there are 3 funcs which need to be _initcalled in a logic sequence: 1501 * 1. xen_late_init_mcelog 1502 * 2. mcheck_init_device 1503 * 3. threshold_init_device 1504 * 1505 * xen_late_init_mcelog must register xen_mce_chrdev_device before 1506 * native mce_chrdev_device registration if running under xen platform; 1507 * 1508 * mcheck_init_device should be inited before threshold_init_device to 1509 * initialize mce_device, otherwise a NULL ptr dereference will cause panic. 1510 * 1511 * so we use following _initcalls 1512 * 1. device_initcall(xen_late_init_mcelog); 1513 * 2. device_initcall_sync(mcheck_init_device); 1514 * 3. late_initcall(threshold_init_device); 1515 * 1516 * when running under xen, the initcall order is 1,2,3; 1517 * on baremetal, we skip 1 and we do only 2 and 3. 1518 */ 1519 late_initcall(threshold_init_device); 1520