1 // SPDX-License-Identifier: GPL-2.0-only 2 #include <linux/export.h> 3 #include <linux/bitops.h> 4 #include <linux/elf.h> 5 #include <linux/mm.h> 6 7 #include <linux/io.h> 8 #include <linux/sched.h> 9 #include <linux/sched/clock.h> 10 #include <linux/random.h> 11 #include <linux/topology.h> 12 #include <asm/processor.h> 13 #include <asm/apic.h> 14 #include <asm/cacheinfo.h> 15 #include <asm/cpu.h> 16 #include <asm/spec-ctrl.h> 17 #include <asm/smp.h> 18 #include <asm/numa.h> 19 #include <asm/pci-direct.h> 20 #include <asm/delay.h> 21 #include <asm/debugreg.h> 22 #include <asm/resctrl.h> 23 24 #ifdef CONFIG_X86_64 25 # include <asm/mmconfig.h> 26 #endif 27 28 #include "cpu.h" 29 30 static const int amd_erratum_383[]; 31 static const int amd_erratum_400[]; 32 static const int amd_erratum_1054[]; 33 static bool cpu_has_amd_erratum(struct cpuinfo_x86 *cpu, const int *erratum); 34 35 /* 36 * nodes_per_socket: Stores the number of nodes per socket. 37 * Refer to Fam15h Models 00-0fh BKDG - CPUID Fn8000_001E_ECX 38 * Node Identifiers[10:8] 39 */ 40 static u32 nodes_per_socket = 1; 41 42 static inline int rdmsrl_amd_safe(unsigned msr, unsigned long long *p) 43 { 44 u32 gprs[8] = { 0 }; 45 int err; 46 47 WARN_ONCE((boot_cpu_data.x86 != 0xf), 48 "%s should only be used on K8!\n", __func__); 49 50 gprs[1] = msr; 51 gprs[7] = 0x9c5a203a; 52 53 err = rdmsr_safe_regs(gprs); 54 55 *p = gprs[0] | ((u64)gprs[2] << 32); 56 57 return err; 58 } 59 60 static inline int wrmsrl_amd_safe(unsigned msr, unsigned long long val) 61 { 62 u32 gprs[8] = { 0 }; 63 64 WARN_ONCE((boot_cpu_data.x86 != 0xf), 65 "%s should only be used on K8!\n", __func__); 66 67 gprs[0] = (u32)val; 68 gprs[1] = msr; 69 gprs[2] = val >> 32; 70 gprs[7] = 0x9c5a203a; 71 72 return wrmsr_safe_regs(gprs); 73 } 74 75 /* 76 * B step AMD K6 before B 9730xxxx have hardware bugs that can cause 77 * misexecution of code under Linux. Owners of such processors should 78 * contact AMD for precise details and a CPU swap. 79 * 80 * See http://www.multimania.com/poulot/k6bug.html 81 * and section 2.6.2 of "AMD-K6 Processor Revision Guide - Model 6" 82 * (Publication # 21266 Issue Date: August 1998) 83 * 84 * The following test is erm.. interesting. AMD neglected to up 85 * the chip setting when fixing the bug but they also tweaked some 86 * performance at the same time.. 87 */ 88 89 #ifdef CONFIG_X86_32 90 extern __visible void vide(void); 91 __asm__(".text\n" 92 ".globl vide\n" 93 ".type vide, @function\n" 94 ".align 4\n" 95 "vide: ret\n"); 96 #endif 97 98 static void init_amd_k5(struct cpuinfo_x86 *c) 99 { 100 #ifdef CONFIG_X86_32 101 /* 102 * General Systems BIOSen alias the cpu frequency registers 103 * of the Elan at 0x000df000. Unfortunately, one of the Linux 104 * drivers subsequently pokes it, and changes the CPU speed. 105 * Workaround : Remove the unneeded alias. 106 */ 107 #define CBAR (0xfffc) /* Configuration Base Address (32-bit) */ 108 #define CBAR_ENB (0x80000000) 109 #define CBAR_KEY (0X000000CB) 110 if (c->x86_model == 9 || c->x86_model == 10) { 111 if (inl(CBAR) & CBAR_ENB) 112 outl(0 | CBAR_KEY, CBAR); 113 } 114 #endif 115 } 116 117 static void init_amd_k6(struct cpuinfo_x86 *c) 118 { 119 #ifdef CONFIG_X86_32 120 u32 l, h; 121 int mbytes = get_num_physpages() >> (20-PAGE_SHIFT); 122 123 if (c->x86_model < 6) { 124 /* Based on AMD doc 20734R - June 2000 */ 125 if (c->x86_model == 0) { 126 clear_cpu_cap(c, X86_FEATURE_APIC); 127 set_cpu_cap(c, X86_FEATURE_PGE); 128 } 129 return; 130 } 131 132 if (c->x86_model == 6 && c->x86_stepping == 1) { 133 const int K6_BUG_LOOP = 1000000; 134 int n; 135 void (*f_vide)(void); 136 u64 d, d2; 137 138 pr_info("AMD K6 stepping B detected - "); 139 140 /* 141 * It looks like AMD fixed the 2.6.2 bug and improved indirect 142 * calls at the same time. 143 */ 144 145 n = K6_BUG_LOOP; 146 f_vide = vide; 147 OPTIMIZER_HIDE_VAR(f_vide); 148 d = rdtsc(); 149 while (n--) 150 f_vide(); 151 d2 = rdtsc(); 152 d = d2-d; 153 154 if (d > 20*K6_BUG_LOOP) 155 pr_cont("system stability may be impaired when more than 32 MB are used.\n"); 156 else 157 pr_cont("probably OK (after B9730xxxx).\n"); 158 } 159 160 /* K6 with old style WHCR */ 161 if (c->x86_model < 8 || 162 (c->x86_model == 8 && c->x86_stepping < 8)) { 163 /* We can only write allocate on the low 508Mb */ 164 if (mbytes > 508) 165 mbytes = 508; 166 167 rdmsr(MSR_K6_WHCR, l, h); 168 if ((l&0x0000FFFF) == 0) { 169 unsigned long flags; 170 l = (1<<0)|((mbytes/4)<<1); 171 local_irq_save(flags); 172 wbinvd(); 173 wrmsr(MSR_K6_WHCR, l, h); 174 local_irq_restore(flags); 175 pr_info("Enabling old style K6 write allocation for %d Mb\n", 176 mbytes); 177 } 178 return; 179 } 180 181 if ((c->x86_model == 8 && c->x86_stepping > 7) || 182 c->x86_model == 9 || c->x86_model == 13) { 183 /* The more serious chips .. */ 184 185 if (mbytes > 4092) 186 mbytes = 4092; 187 188 rdmsr(MSR_K6_WHCR, l, h); 189 if ((l&0xFFFF0000) == 0) { 190 unsigned long flags; 191 l = ((mbytes>>2)<<22)|(1<<16); 192 local_irq_save(flags); 193 wbinvd(); 194 wrmsr(MSR_K6_WHCR, l, h); 195 local_irq_restore(flags); 196 pr_info("Enabling new style K6 write allocation for %d Mb\n", 197 mbytes); 198 } 199 200 return; 201 } 202 203 if (c->x86_model == 10) { 204 /* AMD Geode LX is model 10 */ 205 /* placeholder for any needed mods */ 206 return; 207 } 208 #endif 209 } 210 211 static void init_amd_k7(struct cpuinfo_x86 *c) 212 { 213 #ifdef CONFIG_X86_32 214 u32 l, h; 215 216 /* 217 * Bit 15 of Athlon specific MSR 15, needs to be 0 218 * to enable SSE on Palomino/Morgan/Barton CPU's. 219 * If the BIOS didn't enable it already, enable it here. 220 */ 221 if (c->x86_model >= 6 && c->x86_model <= 10) { 222 if (!cpu_has(c, X86_FEATURE_XMM)) { 223 pr_info("Enabling disabled K7/SSE Support.\n"); 224 msr_clear_bit(MSR_K7_HWCR, 15); 225 set_cpu_cap(c, X86_FEATURE_XMM); 226 } 227 } 228 229 /* 230 * It's been determined by AMD that Athlons since model 8 stepping 1 231 * are more robust with CLK_CTL set to 200xxxxx instead of 600xxxxx 232 * As per AMD technical note 27212 0.2 233 */ 234 if ((c->x86_model == 8 && c->x86_stepping >= 1) || (c->x86_model > 8)) { 235 rdmsr(MSR_K7_CLK_CTL, l, h); 236 if ((l & 0xfff00000) != 0x20000000) { 237 pr_info("CPU: CLK_CTL MSR was %x. Reprogramming to %x\n", 238 l, ((l & 0x000fffff)|0x20000000)); 239 wrmsr(MSR_K7_CLK_CTL, (l & 0x000fffff)|0x20000000, h); 240 } 241 } 242 243 /* calling is from identify_secondary_cpu() ? */ 244 if (!c->cpu_index) 245 return; 246 247 /* 248 * Certain Athlons might work (for various values of 'work') in SMP 249 * but they are not certified as MP capable. 250 */ 251 /* Athlon 660/661 is valid. */ 252 if ((c->x86_model == 6) && ((c->x86_stepping == 0) || 253 (c->x86_stepping == 1))) 254 return; 255 256 /* Duron 670 is valid */ 257 if ((c->x86_model == 7) && (c->x86_stepping == 0)) 258 return; 259 260 /* 261 * Athlon 662, Duron 671, and Athlon >model 7 have capability 262 * bit. It's worth noting that the A5 stepping (662) of some 263 * Athlon XP's have the MP bit set. 264 * See http://www.heise.de/newsticker/data/jow-18.10.01-000 for 265 * more. 266 */ 267 if (((c->x86_model == 6) && (c->x86_stepping >= 2)) || 268 ((c->x86_model == 7) && (c->x86_stepping >= 1)) || 269 (c->x86_model > 7)) 270 if (cpu_has(c, X86_FEATURE_MP)) 271 return; 272 273 /* If we get here, not a certified SMP capable AMD system. */ 274 275 /* 276 * Don't taint if we are running SMP kernel on a single non-MP 277 * approved Athlon 278 */ 279 WARN_ONCE(1, "WARNING: This combination of AMD" 280 " processors is not suitable for SMP.\n"); 281 add_taint(TAINT_CPU_OUT_OF_SPEC, LOCKDEP_NOW_UNRELIABLE); 282 #endif 283 } 284 285 #ifdef CONFIG_NUMA 286 /* 287 * To workaround broken NUMA config. Read the comment in 288 * srat_detect_node(). 289 */ 290 static int nearby_node(int apicid) 291 { 292 int i, node; 293 294 for (i = apicid - 1; i >= 0; i--) { 295 node = __apicid_to_node[i]; 296 if (node != NUMA_NO_NODE && node_online(node)) 297 return node; 298 } 299 for (i = apicid + 1; i < MAX_LOCAL_APIC; i++) { 300 node = __apicid_to_node[i]; 301 if (node != NUMA_NO_NODE && node_online(node)) 302 return node; 303 } 304 return first_node(node_online_map); /* Shouldn't happen */ 305 } 306 #endif 307 308 /* 309 * Fix up cpu_core_id for pre-F17h systems to be in the 310 * [0 .. cores_per_node - 1] range. Not really needed but 311 * kept so as not to break existing setups. 312 */ 313 static void legacy_fixup_core_id(struct cpuinfo_x86 *c) 314 { 315 u32 cus_per_node; 316 317 if (c->x86 >= 0x17) 318 return; 319 320 cus_per_node = c->x86_max_cores / nodes_per_socket; 321 c->cpu_core_id %= cus_per_node; 322 } 323 324 /* 325 * Fixup core topology information for 326 * (1) AMD multi-node processors 327 * Assumption: Number of cores in each internal node is the same. 328 * (2) AMD processors supporting compute units 329 */ 330 static void amd_get_topology(struct cpuinfo_x86 *c) 331 { 332 int cpu = smp_processor_id(); 333 334 /* get information required for multi-node processors */ 335 if (boot_cpu_has(X86_FEATURE_TOPOEXT)) { 336 int err; 337 u32 eax, ebx, ecx, edx; 338 339 cpuid(0x8000001e, &eax, &ebx, &ecx, &edx); 340 341 c->cpu_die_id = ecx & 0xff; 342 343 if (c->x86 == 0x15) 344 c->cu_id = ebx & 0xff; 345 346 if (c->x86 >= 0x17) { 347 c->cpu_core_id = ebx & 0xff; 348 349 if (smp_num_siblings > 1) 350 c->x86_max_cores /= smp_num_siblings; 351 } 352 353 /* 354 * In case leaf B is available, use it to derive 355 * topology information. 356 */ 357 err = detect_extended_topology(c); 358 if (!err) 359 c->x86_coreid_bits = get_count_order(c->x86_max_cores); 360 361 cacheinfo_amd_init_llc_id(c, cpu); 362 363 } else if (cpu_has(c, X86_FEATURE_NODEID_MSR)) { 364 u64 value; 365 366 rdmsrl(MSR_FAM10H_NODE_ID, value); 367 c->cpu_die_id = value & 7; 368 369 per_cpu(cpu_llc_id, cpu) = c->cpu_die_id; 370 } else 371 return; 372 373 if (nodes_per_socket > 1) { 374 set_cpu_cap(c, X86_FEATURE_AMD_DCM); 375 legacy_fixup_core_id(c); 376 } 377 } 378 379 /* 380 * On a AMD dual core setup the lower bits of the APIC id distinguish the cores. 381 * Assumes number of cores is a power of two. 382 */ 383 static void amd_detect_cmp(struct cpuinfo_x86 *c) 384 { 385 unsigned bits; 386 int cpu = smp_processor_id(); 387 388 bits = c->x86_coreid_bits; 389 /* Low order bits define the core id (index of core in socket) */ 390 c->cpu_core_id = c->initial_apicid & ((1 << bits)-1); 391 /* Convert the initial APIC ID into the socket ID */ 392 c->phys_proc_id = c->initial_apicid >> bits; 393 /* use socket ID also for last level cache */ 394 per_cpu(cpu_llc_id, cpu) = c->cpu_die_id = c->phys_proc_id; 395 } 396 397 static void amd_detect_ppin(struct cpuinfo_x86 *c) 398 { 399 unsigned long long val; 400 401 if (!cpu_has(c, X86_FEATURE_AMD_PPIN)) 402 return; 403 404 /* When PPIN is defined in CPUID, still need to check PPIN_CTL MSR */ 405 if (rdmsrl_safe(MSR_AMD_PPIN_CTL, &val)) 406 goto clear_ppin; 407 408 /* PPIN is locked in disabled mode, clear feature bit */ 409 if ((val & 3UL) == 1UL) 410 goto clear_ppin; 411 412 /* If PPIN is disabled, try to enable it */ 413 if (!(val & 2UL)) { 414 wrmsrl_safe(MSR_AMD_PPIN_CTL, val | 2UL); 415 rdmsrl_safe(MSR_AMD_PPIN_CTL, &val); 416 } 417 418 /* If PPIN_EN bit is 1, return from here; otherwise fall through */ 419 if (val & 2UL) 420 return; 421 422 clear_ppin: 423 clear_cpu_cap(c, X86_FEATURE_AMD_PPIN); 424 } 425 426 u32 amd_get_nodes_per_socket(void) 427 { 428 return nodes_per_socket; 429 } 430 EXPORT_SYMBOL_GPL(amd_get_nodes_per_socket); 431 432 static void srat_detect_node(struct cpuinfo_x86 *c) 433 { 434 #ifdef CONFIG_NUMA 435 int cpu = smp_processor_id(); 436 int node; 437 unsigned apicid = c->apicid; 438 439 node = numa_cpu_node(cpu); 440 if (node == NUMA_NO_NODE) 441 node = per_cpu(cpu_llc_id, cpu); 442 443 /* 444 * On multi-fabric platform (e.g. Numascale NumaChip) a 445 * platform-specific handler needs to be called to fixup some 446 * IDs of the CPU. 447 */ 448 if (x86_cpuinit.fixup_cpu_id) 449 x86_cpuinit.fixup_cpu_id(c, node); 450 451 if (!node_online(node)) { 452 /* 453 * Two possibilities here: 454 * 455 * - The CPU is missing memory and no node was created. In 456 * that case try picking one from a nearby CPU. 457 * 458 * - The APIC IDs differ from the HyperTransport node IDs 459 * which the K8 northbridge parsing fills in. Assume 460 * they are all increased by a constant offset, but in 461 * the same order as the HT nodeids. If that doesn't 462 * result in a usable node fall back to the path for the 463 * previous case. 464 * 465 * This workaround operates directly on the mapping between 466 * APIC ID and NUMA node, assuming certain relationship 467 * between APIC ID, HT node ID and NUMA topology. As going 468 * through CPU mapping may alter the outcome, directly 469 * access __apicid_to_node[]. 470 */ 471 int ht_nodeid = c->initial_apicid; 472 473 if (__apicid_to_node[ht_nodeid] != NUMA_NO_NODE) 474 node = __apicid_to_node[ht_nodeid]; 475 /* Pick a nearby node */ 476 if (!node_online(node)) 477 node = nearby_node(apicid); 478 } 479 numa_set_node(cpu, node); 480 #endif 481 } 482 483 static void early_init_amd_mc(struct cpuinfo_x86 *c) 484 { 485 #ifdef CONFIG_SMP 486 unsigned bits, ecx; 487 488 /* Multi core CPU? */ 489 if (c->extended_cpuid_level < 0x80000008) 490 return; 491 492 ecx = cpuid_ecx(0x80000008); 493 494 c->x86_max_cores = (ecx & 0xff) + 1; 495 496 /* CPU telling us the core id bits shift? */ 497 bits = (ecx >> 12) & 0xF; 498 499 /* Otherwise recompute */ 500 if (bits == 0) { 501 while ((1 << bits) < c->x86_max_cores) 502 bits++; 503 } 504 505 c->x86_coreid_bits = bits; 506 #endif 507 } 508 509 static void bsp_init_amd(struct cpuinfo_x86 *c) 510 { 511 if (cpu_has(c, X86_FEATURE_CONSTANT_TSC)) { 512 513 if (c->x86 > 0x10 || 514 (c->x86 == 0x10 && c->x86_model >= 0x2)) { 515 u64 val; 516 517 rdmsrl(MSR_K7_HWCR, val); 518 if (!(val & BIT(24))) 519 pr_warn(FW_BUG "TSC doesn't count with P0 frequency!\n"); 520 } 521 } 522 523 if (c->x86 == 0x15) { 524 unsigned long upperbit; 525 u32 cpuid, assoc; 526 527 cpuid = cpuid_edx(0x80000005); 528 assoc = cpuid >> 16 & 0xff; 529 upperbit = ((cpuid >> 24) << 10) / assoc; 530 531 va_align.mask = (upperbit - 1) & PAGE_MASK; 532 va_align.flags = ALIGN_VA_32 | ALIGN_VA_64; 533 534 /* A random value per boot for bit slice [12:upper_bit) */ 535 va_align.bits = get_random_int() & va_align.mask; 536 } 537 538 if (cpu_has(c, X86_FEATURE_MWAITX)) 539 use_mwaitx_delay(); 540 541 if (boot_cpu_has(X86_FEATURE_TOPOEXT)) { 542 u32 ecx; 543 544 ecx = cpuid_ecx(0x8000001e); 545 nodes_per_socket = ((ecx >> 8) & 7) + 1; 546 } else if (boot_cpu_has(X86_FEATURE_NODEID_MSR)) { 547 u64 value; 548 549 rdmsrl(MSR_FAM10H_NODE_ID, value); 550 nodes_per_socket = ((value >> 3) & 7) + 1; 551 } 552 553 if (!boot_cpu_has(X86_FEATURE_AMD_SSBD) && 554 !boot_cpu_has(X86_FEATURE_VIRT_SSBD) && 555 c->x86 >= 0x15 && c->x86 <= 0x17) { 556 unsigned int bit; 557 558 switch (c->x86) { 559 case 0x15: bit = 54; break; 560 case 0x16: bit = 33; break; 561 case 0x17: bit = 10; break; 562 default: return; 563 } 564 /* 565 * Try to cache the base value so further operations can 566 * avoid RMW. If that faults, do not enable SSBD. 567 */ 568 if (!rdmsrl_safe(MSR_AMD64_LS_CFG, &x86_amd_ls_cfg_base)) { 569 setup_force_cpu_cap(X86_FEATURE_LS_CFG_SSBD); 570 setup_force_cpu_cap(X86_FEATURE_SSBD); 571 x86_amd_ls_cfg_ssbd_mask = 1ULL << bit; 572 } 573 } 574 575 resctrl_cpu_detect(c); 576 } 577 578 static void early_detect_mem_encrypt(struct cpuinfo_x86 *c) 579 { 580 u64 msr; 581 582 /* 583 * BIOS support is required for SME and SEV. 584 * For SME: If BIOS has enabled SME then adjust x86_phys_bits by 585 * the SME physical address space reduction value. 586 * If BIOS has not enabled SME then don't advertise the 587 * SME feature (set in scattered.c). 588 * For SEV: If BIOS has not enabled SEV then don't advertise the 589 * SEV and SEV_ES feature (set in scattered.c). 590 * 591 * In all cases, since support for SME and SEV requires long mode, 592 * don't advertise the feature under CONFIG_X86_32. 593 */ 594 if (cpu_has(c, X86_FEATURE_SME) || cpu_has(c, X86_FEATURE_SEV)) { 595 /* Check if memory encryption is enabled */ 596 rdmsrl(MSR_K8_SYSCFG, msr); 597 if (!(msr & MSR_K8_SYSCFG_MEM_ENCRYPT)) 598 goto clear_all; 599 600 /* 601 * Always adjust physical address bits. Even though this 602 * will be a value above 32-bits this is still done for 603 * CONFIG_X86_32 so that accurate values are reported. 604 */ 605 c->x86_phys_bits -= (cpuid_ebx(0x8000001f) >> 6) & 0x3f; 606 607 if (IS_ENABLED(CONFIG_X86_32)) 608 goto clear_all; 609 610 rdmsrl(MSR_K7_HWCR, msr); 611 if (!(msr & MSR_K7_HWCR_SMMLOCK)) 612 goto clear_sev; 613 614 return; 615 616 clear_all: 617 setup_clear_cpu_cap(X86_FEATURE_SME); 618 clear_sev: 619 setup_clear_cpu_cap(X86_FEATURE_SEV); 620 setup_clear_cpu_cap(X86_FEATURE_SEV_ES); 621 } 622 } 623 624 static void early_init_amd(struct cpuinfo_x86 *c) 625 { 626 u64 value; 627 u32 dummy; 628 629 early_init_amd_mc(c); 630 631 #ifdef CONFIG_X86_32 632 if (c->x86 == 6) 633 set_cpu_cap(c, X86_FEATURE_K7); 634 #endif 635 636 if (c->x86 >= 0xf) 637 set_cpu_cap(c, X86_FEATURE_K8); 638 639 rdmsr_safe(MSR_AMD64_PATCH_LEVEL, &c->microcode, &dummy); 640 641 /* 642 * c->x86_power is 8000_0007 edx. Bit 8 is TSC runs at constant rate 643 * with P/T states and does not stop in deep C-states 644 */ 645 if (c->x86_power & (1 << 8)) { 646 set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC); 647 set_cpu_cap(c, X86_FEATURE_NONSTOP_TSC); 648 } 649 650 /* Bit 12 of 8000_0007 edx is accumulated power mechanism. */ 651 if (c->x86_power & BIT(12)) 652 set_cpu_cap(c, X86_FEATURE_ACC_POWER); 653 654 #ifdef CONFIG_X86_64 655 set_cpu_cap(c, X86_FEATURE_SYSCALL32); 656 #else 657 /* Set MTRR capability flag if appropriate */ 658 if (c->x86 == 5) 659 if (c->x86_model == 13 || c->x86_model == 9 || 660 (c->x86_model == 8 && c->x86_stepping >= 8)) 661 set_cpu_cap(c, X86_FEATURE_K6_MTRR); 662 #endif 663 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_PCI) 664 /* 665 * ApicID can always be treated as an 8-bit value for AMD APIC versions 666 * >= 0x10, but even old K8s came out of reset with version 0x10. So, we 667 * can safely set X86_FEATURE_EXTD_APICID unconditionally for families 668 * after 16h. 669 */ 670 if (boot_cpu_has(X86_FEATURE_APIC)) { 671 if (c->x86 > 0x16) 672 set_cpu_cap(c, X86_FEATURE_EXTD_APICID); 673 else if (c->x86 >= 0xf) { 674 /* check CPU config space for extended APIC ID */ 675 unsigned int val; 676 677 val = read_pci_config(0, 24, 0, 0x68); 678 if ((val >> 17 & 0x3) == 0x3) 679 set_cpu_cap(c, X86_FEATURE_EXTD_APICID); 680 } 681 } 682 #endif 683 684 /* 685 * This is only needed to tell the kernel whether to use VMCALL 686 * and VMMCALL. VMMCALL is never executed except under virt, so 687 * we can set it unconditionally. 688 */ 689 set_cpu_cap(c, X86_FEATURE_VMMCALL); 690 691 /* F16h erratum 793, CVE-2013-6885 */ 692 if (c->x86 == 0x16 && c->x86_model <= 0xf) 693 msr_set_bit(MSR_AMD64_LS_CFG, 15); 694 695 /* 696 * Check whether the machine is affected by erratum 400. This is 697 * used to select the proper idle routine and to enable the check 698 * whether the machine is affected in arch_post_acpi_init(), which 699 * sets the X86_BUG_AMD_APIC_C1E bug depending on the MSR check. 700 */ 701 if (cpu_has_amd_erratum(c, amd_erratum_400)) 702 set_cpu_bug(c, X86_BUG_AMD_E400); 703 704 early_detect_mem_encrypt(c); 705 706 /* Re-enable TopologyExtensions if switched off by BIOS */ 707 if (c->x86 == 0x15 && 708 (c->x86_model >= 0x10 && c->x86_model <= 0x6f) && 709 !cpu_has(c, X86_FEATURE_TOPOEXT)) { 710 711 if (msr_set_bit(0xc0011005, 54) > 0) { 712 rdmsrl(0xc0011005, value); 713 if (value & BIT_64(54)) { 714 set_cpu_cap(c, X86_FEATURE_TOPOEXT); 715 pr_info_once(FW_INFO "CPU: Re-enabling disabled Topology Extensions Support.\n"); 716 } 717 } 718 } 719 720 if (cpu_has(c, X86_FEATURE_TOPOEXT)) 721 smp_num_siblings = ((cpuid_ebx(0x8000001e) >> 8) & 0xff) + 1; 722 } 723 724 static void init_amd_k8(struct cpuinfo_x86 *c) 725 { 726 u32 level; 727 u64 value; 728 729 /* On C+ stepping K8 rep microcode works well for copy/memset */ 730 level = cpuid_eax(1); 731 if ((level >= 0x0f48 && level < 0x0f50) || level >= 0x0f58) 732 set_cpu_cap(c, X86_FEATURE_REP_GOOD); 733 734 /* 735 * Some BIOSes incorrectly force this feature, but only K8 revision D 736 * (model = 0x14) and later actually support it. 737 * (AMD Erratum #110, docId: 25759). 738 */ 739 if (c->x86_model < 0x14 && cpu_has(c, X86_FEATURE_LAHF_LM)) { 740 clear_cpu_cap(c, X86_FEATURE_LAHF_LM); 741 if (!rdmsrl_amd_safe(0xc001100d, &value)) { 742 value &= ~BIT_64(32); 743 wrmsrl_amd_safe(0xc001100d, value); 744 } 745 } 746 747 if (!c->x86_model_id[0]) 748 strcpy(c->x86_model_id, "Hammer"); 749 750 #ifdef CONFIG_SMP 751 /* 752 * Disable TLB flush filter by setting HWCR.FFDIS on K8 753 * bit 6 of msr C001_0015 754 * 755 * Errata 63 for SH-B3 steppings 756 * Errata 122 for all steppings (F+ have it disabled by default) 757 */ 758 msr_set_bit(MSR_K7_HWCR, 6); 759 #endif 760 set_cpu_bug(c, X86_BUG_SWAPGS_FENCE); 761 } 762 763 static void init_amd_gh(struct cpuinfo_x86 *c) 764 { 765 #ifdef CONFIG_MMCONF_FAM10H 766 /* do this for boot cpu */ 767 if (c == &boot_cpu_data) 768 check_enable_amd_mmconf_dmi(); 769 770 fam10h_check_enable_mmcfg(); 771 #endif 772 773 /* 774 * Disable GART TLB Walk Errors on Fam10h. We do this here because this 775 * is always needed when GART is enabled, even in a kernel which has no 776 * MCE support built in. BIOS should disable GartTlbWlk Errors already. 777 * If it doesn't, we do it here as suggested by the BKDG. 778 * 779 * Fixes: https://bugzilla.kernel.org/show_bug.cgi?id=33012 780 */ 781 msr_set_bit(MSR_AMD64_MCx_MASK(4), 10); 782 783 /* 784 * On family 10h BIOS may not have properly enabled WC+ support, causing 785 * it to be converted to CD memtype. This may result in performance 786 * degradation for certain nested-paging guests. Prevent this conversion 787 * by clearing bit 24 in MSR_AMD64_BU_CFG2. 788 * 789 * NOTE: we want to use the _safe accessors so as not to #GP kvm 790 * guests on older kvm hosts. 791 */ 792 msr_clear_bit(MSR_AMD64_BU_CFG2, 24); 793 794 if (cpu_has_amd_erratum(c, amd_erratum_383)) 795 set_cpu_bug(c, X86_BUG_AMD_TLB_MMATCH); 796 } 797 798 #define MSR_AMD64_DE_CFG 0xC0011029 799 800 static void init_amd_ln(struct cpuinfo_x86 *c) 801 { 802 /* 803 * Apply erratum 665 fix unconditionally so machines without a BIOS 804 * fix work. 805 */ 806 msr_set_bit(MSR_AMD64_DE_CFG, 31); 807 } 808 809 static bool rdrand_force; 810 811 static int __init rdrand_cmdline(char *str) 812 { 813 if (!str) 814 return -EINVAL; 815 816 if (!strcmp(str, "force")) 817 rdrand_force = true; 818 else 819 return -EINVAL; 820 821 return 0; 822 } 823 early_param("rdrand", rdrand_cmdline); 824 825 static void clear_rdrand_cpuid_bit(struct cpuinfo_x86 *c) 826 { 827 /* 828 * Saving of the MSR used to hide the RDRAND support during 829 * suspend/resume is done by arch/x86/power/cpu.c, which is 830 * dependent on CONFIG_PM_SLEEP. 831 */ 832 if (!IS_ENABLED(CONFIG_PM_SLEEP)) 833 return; 834 835 /* 836 * The nordrand option can clear X86_FEATURE_RDRAND, so check for 837 * RDRAND support using the CPUID function directly. 838 */ 839 if (!(cpuid_ecx(1) & BIT(30)) || rdrand_force) 840 return; 841 842 msr_clear_bit(MSR_AMD64_CPUID_FN_1, 62); 843 844 /* 845 * Verify that the CPUID change has occurred in case the kernel is 846 * running virtualized and the hypervisor doesn't support the MSR. 847 */ 848 if (cpuid_ecx(1) & BIT(30)) { 849 pr_info_once("BIOS may not properly restore RDRAND after suspend, but hypervisor does not support hiding RDRAND via CPUID.\n"); 850 return; 851 } 852 853 clear_cpu_cap(c, X86_FEATURE_RDRAND); 854 pr_info_once("BIOS may not properly restore RDRAND after suspend, hiding RDRAND via CPUID. Use rdrand=force to reenable.\n"); 855 } 856 857 static void init_amd_jg(struct cpuinfo_x86 *c) 858 { 859 /* 860 * Some BIOS implementations do not restore proper RDRAND support 861 * across suspend and resume. Check on whether to hide the RDRAND 862 * instruction support via CPUID. 863 */ 864 clear_rdrand_cpuid_bit(c); 865 } 866 867 static void init_amd_bd(struct cpuinfo_x86 *c) 868 { 869 u64 value; 870 871 /* 872 * The way access filter has a performance penalty on some workloads. 873 * Disable it on the affected CPUs. 874 */ 875 if ((c->x86_model >= 0x02) && (c->x86_model < 0x20)) { 876 if (!rdmsrl_safe(MSR_F15H_IC_CFG, &value) && !(value & 0x1E)) { 877 value |= 0x1E; 878 wrmsrl_safe(MSR_F15H_IC_CFG, value); 879 } 880 } 881 882 /* 883 * Some BIOS implementations do not restore proper RDRAND support 884 * across suspend and resume. Check on whether to hide the RDRAND 885 * instruction support via CPUID. 886 */ 887 clear_rdrand_cpuid_bit(c); 888 } 889 890 static void init_amd_zn(struct cpuinfo_x86 *c) 891 { 892 set_cpu_cap(c, X86_FEATURE_ZEN); 893 894 #ifdef CONFIG_NUMA 895 node_reclaim_distance = 32; 896 #endif 897 898 /* 899 * Fix erratum 1076: CPB feature bit not being set in CPUID. 900 * Always set it, except when running under a hypervisor. 901 */ 902 if (!cpu_has(c, X86_FEATURE_HYPERVISOR) && !cpu_has(c, X86_FEATURE_CPB)) 903 set_cpu_cap(c, X86_FEATURE_CPB); 904 } 905 906 static void init_amd(struct cpuinfo_x86 *c) 907 { 908 early_init_amd(c); 909 910 /* 911 * Bit 31 in normal CPUID used for nonstandard 3DNow ID; 912 * 3DNow is IDd by bit 31 in extended CPUID (1*32+31) anyway 913 */ 914 clear_cpu_cap(c, 0*32+31); 915 916 if (c->x86 >= 0x10) 917 set_cpu_cap(c, X86_FEATURE_REP_GOOD); 918 919 /* get apicid instead of initial apic id from cpuid */ 920 c->apicid = hard_smp_processor_id(); 921 922 /* K6s reports MCEs but don't actually have all the MSRs */ 923 if (c->x86 < 6) 924 clear_cpu_cap(c, X86_FEATURE_MCE); 925 926 switch (c->x86) { 927 case 4: init_amd_k5(c); break; 928 case 5: init_amd_k6(c); break; 929 case 6: init_amd_k7(c); break; 930 case 0xf: init_amd_k8(c); break; 931 case 0x10: init_amd_gh(c); break; 932 case 0x12: init_amd_ln(c); break; 933 case 0x15: init_amd_bd(c); break; 934 case 0x16: init_amd_jg(c); break; 935 case 0x17: fallthrough; 936 case 0x19: init_amd_zn(c); break; 937 } 938 939 /* 940 * Enable workaround for FXSAVE leak on CPUs 941 * without a XSaveErPtr feature 942 */ 943 if ((c->x86 >= 6) && (!cpu_has(c, X86_FEATURE_XSAVEERPTR))) 944 set_cpu_bug(c, X86_BUG_FXSAVE_LEAK); 945 946 cpu_detect_cache_sizes(c); 947 948 amd_detect_cmp(c); 949 amd_get_topology(c); 950 srat_detect_node(c); 951 amd_detect_ppin(c); 952 953 init_amd_cacheinfo(c); 954 955 if (cpu_has(c, X86_FEATURE_XMM2)) { 956 /* 957 * Use LFENCE for execution serialization. On families which 958 * don't have that MSR, LFENCE is already serializing. 959 * msr_set_bit() uses the safe accessors, too, even if the MSR 960 * is not present. 961 */ 962 msr_set_bit(MSR_F10H_DECFG, 963 MSR_F10H_DECFG_LFENCE_SERIALIZE_BIT); 964 965 /* A serializing LFENCE stops RDTSC speculation */ 966 set_cpu_cap(c, X86_FEATURE_LFENCE_RDTSC); 967 } 968 969 /* 970 * Family 0x12 and above processors have APIC timer 971 * running in deep C states. 972 */ 973 if (c->x86 > 0x11) 974 set_cpu_cap(c, X86_FEATURE_ARAT); 975 976 /* 3DNow or LM implies PREFETCHW */ 977 if (!cpu_has(c, X86_FEATURE_3DNOWPREFETCH)) 978 if (cpu_has(c, X86_FEATURE_3DNOW) || cpu_has(c, X86_FEATURE_LM)) 979 set_cpu_cap(c, X86_FEATURE_3DNOWPREFETCH); 980 981 /* AMD CPUs don't reset SS attributes on SYSRET, Xen does. */ 982 if (!cpu_has(c, X86_FEATURE_XENPV)) 983 set_cpu_bug(c, X86_BUG_SYSRET_SS_ATTRS); 984 985 /* 986 * Turn on the Instructions Retired free counter on machines not 987 * susceptible to erratum #1054 "Instructions Retired Performance 988 * Counter May Be Inaccurate". 989 */ 990 if (cpu_has(c, X86_FEATURE_IRPERF) && 991 !cpu_has_amd_erratum(c, amd_erratum_1054)) 992 msr_set_bit(MSR_K7_HWCR, MSR_K7_HWCR_IRPERF_EN_BIT); 993 } 994 995 #ifdef CONFIG_X86_32 996 static unsigned int amd_size_cache(struct cpuinfo_x86 *c, unsigned int size) 997 { 998 /* AMD errata T13 (order #21922) */ 999 if (c->x86 == 6) { 1000 /* Duron Rev A0 */ 1001 if (c->x86_model == 3 && c->x86_stepping == 0) 1002 size = 64; 1003 /* Tbird rev A1/A2 */ 1004 if (c->x86_model == 4 && 1005 (c->x86_stepping == 0 || c->x86_stepping == 1)) 1006 size = 256; 1007 } 1008 return size; 1009 } 1010 #endif 1011 1012 static void cpu_detect_tlb_amd(struct cpuinfo_x86 *c) 1013 { 1014 u32 ebx, eax, ecx, edx; 1015 u16 mask = 0xfff; 1016 1017 if (c->x86 < 0xf) 1018 return; 1019 1020 if (c->extended_cpuid_level < 0x80000006) 1021 return; 1022 1023 cpuid(0x80000006, &eax, &ebx, &ecx, &edx); 1024 1025 tlb_lld_4k[ENTRIES] = (ebx >> 16) & mask; 1026 tlb_lli_4k[ENTRIES] = ebx & mask; 1027 1028 /* 1029 * K8 doesn't have 2M/4M entries in the L2 TLB so read out the L1 TLB 1030 * characteristics from the CPUID function 0x80000005 instead. 1031 */ 1032 if (c->x86 == 0xf) { 1033 cpuid(0x80000005, &eax, &ebx, &ecx, &edx); 1034 mask = 0xff; 1035 } 1036 1037 /* Handle DTLB 2M and 4M sizes, fall back to L1 if L2 is disabled */ 1038 if (!((eax >> 16) & mask)) 1039 tlb_lld_2m[ENTRIES] = (cpuid_eax(0x80000005) >> 16) & 0xff; 1040 else 1041 tlb_lld_2m[ENTRIES] = (eax >> 16) & mask; 1042 1043 /* a 4M entry uses two 2M entries */ 1044 tlb_lld_4m[ENTRIES] = tlb_lld_2m[ENTRIES] >> 1; 1045 1046 /* Handle ITLB 2M and 4M sizes, fall back to L1 if L2 is disabled */ 1047 if (!(eax & mask)) { 1048 /* Erratum 658 */ 1049 if (c->x86 == 0x15 && c->x86_model <= 0x1f) { 1050 tlb_lli_2m[ENTRIES] = 1024; 1051 } else { 1052 cpuid(0x80000005, &eax, &ebx, &ecx, &edx); 1053 tlb_lli_2m[ENTRIES] = eax & 0xff; 1054 } 1055 } else 1056 tlb_lli_2m[ENTRIES] = eax & mask; 1057 1058 tlb_lli_4m[ENTRIES] = tlb_lli_2m[ENTRIES] >> 1; 1059 } 1060 1061 static const struct cpu_dev amd_cpu_dev = { 1062 .c_vendor = "AMD", 1063 .c_ident = { "AuthenticAMD" }, 1064 #ifdef CONFIG_X86_32 1065 .legacy_models = { 1066 { .family = 4, .model_names = 1067 { 1068 [3] = "486 DX/2", 1069 [7] = "486 DX/2-WB", 1070 [8] = "486 DX/4", 1071 [9] = "486 DX/4-WB", 1072 [14] = "Am5x86-WT", 1073 [15] = "Am5x86-WB" 1074 } 1075 }, 1076 }, 1077 .legacy_cache_size = amd_size_cache, 1078 #endif 1079 .c_early_init = early_init_amd, 1080 .c_detect_tlb = cpu_detect_tlb_amd, 1081 .c_bsp_init = bsp_init_amd, 1082 .c_init = init_amd, 1083 .c_x86_vendor = X86_VENDOR_AMD, 1084 }; 1085 1086 cpu_dev_register(amd_cpu_dev); 1087 1088 /* 1089 * AMD errata checking 1090 * 1091 * Errata are defined as arrays of ints using the AMD_LEGACY_ERRATUM() or 1092 * AMD_OSVW_ERRATUM() macros. The latter is intended for newer errata that 1093 * have an OSVW id assigned, which it takes as first argument. Both take a 1094 * variable number of family-specific model-stepping ranges created by 1095 * AMD_MODEL_RANGE(). 1096 * 1097 * Example: 1098 * 1099 * const int amd_erratum_319[] = 1100 * AMD_LEGACY_ERRATUM(AMD_MODEL_RANGE(0x10, 0x2, 0x1, 0x4, 0x2), 1101 * AMD_MODEL_RANGE(0x10, 0x8, 0x0, 0x8, 0x0), 1102 * AMD_MODEL_RANGE(0x10, 0x9, 0x0, 0x9, 0x0)); 1103 */ 1104 1105 #define AMD_LEGACY_ERRATUM(...) { -1, __VA_ARGS__, 0 } 1106 #define AMD_OSVW_ERRATUM(osvw_id, ...) { osvw_id, __VA_ARGS__, 0 } 1107 #define AMD_MODEL_RANGE(f, m_start, s_start, m_end, s_end) \ 1108 ((f << 24) | (m_start << 16) | (s_start << 12) | (m_end << 4) | (s_end)) 1109 #define AMD_MODEL_RANGE_FAMILY(range) (((range) >> 24) & 0xff) 1110 #define AMD_MODEL_RANGE_START(range) (((range) >> 12) & 0xfff) 1111 #define AMD_MODEL_RANGE_END(range) ((range) & 0xfff) 1112 1113 static const int amd_erratum_400[] = 1114 AMD_OSVW_ERRATUM(1, AMD_MODEL_RANGE(0xf, 0x41, 0x2, 0xff, 0xf), 1115 AMD_MODEL_RANGE(0x10, 0x2, 0x1, 0xff, 0xf)); 1116 1117 static const int amd_erratum_383[] = 1118 AMD_OSVW_ERRATUM(3, AMD_MODEL_RANGE(0x10, 0, 0, 0xff, 0xf)); 1119 1120 /* #1054: Instructions Retired Performance Counter May Be Inaccurate */ 1121 static const int amd_erratum_1054[] = 1122 AMD_LEGACY_ERRATUM(AMD_MODEL_RANGE(0x17, 0, 0, 0x2f, 0xf)); 1123 1124 static bool cpu_has_amd_erratum(struct cpuinfo_x86 *cpu, const int *erratum) 1125 { 1126 int osvw_id = *erratum++; 1127 u32 range; 1128 u32 ms; 1129 1130 if (osvw_id >= 0 && osvw_id < 65536 && 1131 cpu_has(cpu, X86_FEATURE_OSVW)) { 1132 u64 osvw_len; 1133 1134 rdmsrl(MSR_AMD64_OSVW_ID_LENGTH, osvw_len); 1135 if (osvw_id < osvw_len) { 1136 u64 osvw_bits; 1137 1138 rdmsrl(MSR_AMD64_OSVW_STATUS + (osvw_id >> 6), 1139 osvw_bits); 1140 return osvw_bits & (1ULL << (osvw_id & 0x3f)); 1141 } 1142 } 1143 1144 /* OSVW unavailable or ID unknown, match family-model-stepping range */ 1145 ms = (cpu->x86_model << 4) | cpu->x86_stepping; 1146 while ((range = *erratum++)) 1147 if ((cpu->x86 == AMD_MODEL_RANGE_FAMILY(range)) && 1148 (ms >= AMD_MODEL_RANGE_START(range)) && 1149 (ms <= AMD_MODEL_RANGE_END(range))) 1150 return true; 1151 1152 return false; 1153 } 1154 1155 void set_dr_addr_mask(unsigned long mask, int dr) 1156 { 1157 if (!boot_cpu_has(X86_FEATURE_BPEXT)) 1158 return; 1159 1160 switch (dr) { 1161 case 0: 1162 wrmsr(MSR_F16H_DR0_ADDR_MASK, mask, 0); 1163 break; 1164 case 1: 1165 case 2: 1166 case 3: 1167 wrmsr(MSR_F16H_DR1_ADDR_MASK - 1 + dr, mask, 0); 1168 break; 1169 default: 1170 break; 1171 } 1172 } 1173