1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Contains CPU specific errata definitions 4 * 5 * Copyright (C) 2014 ARM Ltd. 6 */ 7 8 #include <linux/arm-smccc.h> 9 #include <linux/types.h> 10 #include <linux/cpu.h> 11 #include <asm/cpu.h> 12 #include <asm/cputype.h> 13 #include <asm/cpufeature.h> 14 #include <asm/smp_plat.h> 15 16 static bool __maybe_unused 17 is_affected_midr_range(const struct arm64_cpu_capabilities *entry, int scope) 18 { 19 const struct arm64_midr_revidr *fix; 20 u32 midr = read_cpuid_id(), revidr; 21 22 WARN_ON(scope != SCOPE_LOCAL_CPU || preemptible()); 23 if (!is_midr_in_range(midr, &entry->midr_range)) 24 return false; 25 26 midr &= MIDR_REVISION_MASK | MIDR_VARIANT_MASK; 27 revidr = read_cpuid(REVIDR_EL1); 28 for (fix = entry->fixed_revs; fix && fix->revidr_mask; fix++) 29 if (midr == fix->midr_rv && (revidr & fix->revidr_mask)) 30 return false; 31 32 return true; 33 } 34 35 static bool __maybe_unused 36 is_affected_midr_range_list(const struct arm64_cpu_capabilities *entry, 37 int scope) 38 { 39 WARN_ON(scope != SCOPE_LOCAL_CPU || preemptible()); 40 return is_midr_in_range_list(read_cpuid_id(), entry->midr_range_list); 41 } 42 43 static bool __maybe_unused 44 is_kryo_midr(const struct arm64_cpu_capabilities *entry, int scope) 45 { 46 u32 model; 47 48 WARN_ON(scope != SCOPE_LOCAL_CPU || preemptible()); 49 50 model = read_cpuid_id(); 51 model &= MIDR_IMPLEMENTOR_MASK | (0xf00 << MIDR_PARTNUM_SHIFT) | 52 MIDR_ARCHITECTURE_MASK; 53 54 return model == entry->midr_range.model; 55 } 56 57 static bool 58 has_mismatched_cache_type(const struct arm64_cpu_capabilities *entry, 59 int scope) 60 { 61 u64 mask = arm64_ftr_reg_ctrel0.strict_mask; 62 u64 sys = arm64_ftr_reg_ctrel0.sys_val & mask; 63 u64 ctr_raw, ctr_real; 64 65 WARN_ON(scope != SCOPE_LOCAL_CPU || preemptible()); 66 67 /* 68 * We want to make sure that all the CPUs in the system expose 69 * a consistent CTR_EL0 to make sure that applications behaves 70 * correctly with migration. 71 * 72 * If a CPU has CTR_EL0.IDC but does not advertise it via CTR_EL0 : 73 * 74 * 1) It is safe if the system doesn't support IDC, as CPU anyway 75 * reports IDC = 0, consistent with the rest. 76 * 77 * 2) If the system has IDC, it is still safe as we trap CTR_EL0 78 * access on this CPU via the ARM64_HAS_CACHE_IDC capability. 79 * 80 * So, we need to make sure either the raw CTR_EL0 or the effective 81 * CTR_EL0 matches the system's copy to allow a secondary CPU to boot. 82 */ 83 ctr_raw = read_cpuid_cachetype() & mask; 84 ctr_real = read_cpuid_effective_cachetype() & mask; 85 86 return (ctr_real != sys) && (ctr_raw != sys); 87 } 88 89 static void 90 cpu_enable_trap_ctr_access(const struct arm64_cpu_capabilities *cap) 91 { 92 u64 mask = arm64_ftr_reg_ctrel0.strict_mask; 93 bool enable_uct_trap = false; 94 95 /* Trap CTR_EL0 access on this CPU, only if it has a mismatch */ 96 if ((read_cpuid_cachetype() & mask) != 97 (arm64_ftr_reg_ctrel0.sys_val & mask)) 98 enable_uct_trap = true; 99 100 /* ... or if the system is affected by an erratum */ 101 if (cap->capability == ARM64_WORKAROUND_1542419) 102 enable_uct_trap = true; 103 104 if (enable_uct_trap) 105 sysreg_clear_set(sctlr_el1, SCTLR_EL1_UCT, 0); 106 } 107 108 atomic_t arm64_el2_vector_last_slot = ATOMIC_INIT(-1); 109 110 #include <asm/mmu_context.h> 111 #include <asm/cacheflush.h> 112 113 DEFINE_PER_CPU_READ_MOSTLY(struct bp_hardening_data, bp_hardening_data); 114 115 #ifdef CONFIG_KVM_INDIRECT_VECTORS 116 extern char __smccc_workaround_1_smc_start[]; 117 extern char __smccc_workaround_1_smc_end[]; 118 119 static void __copy_hyp_vect_bpi(int slot, const char *hyp_vecs_start, 120 const char *hyp_vecs_end) 121 { 122 void *dst = lm_alias(__bp_harden_hyp_vecs_start + slot * SZ_2K); 123 int i; 124 125 for (i = 0; i < SZ_2K; i += 0x80) 126 memcpy(dst + i, hyp_vecs_start, hyp_vecs_end - hyp_vecs_start); 127 128 __flush_icache_range((uintptr_t)dst, (uintptr_t)dst + SZ_2K); 129 } 130 131 static void install_bp_hardening_cb(bp_hardening_cb_t fn, 132 const char *hyp_vecs_start, 133 const char *hyp_vecs_end) 134 { 135 static DEFINE_RAW_SPINLOCK(bp_lock); 136 int cpu, slot = -1; 137 138 /* 139 * detect_harden_bp_fw() passes NULL for the hyp_vecs start/end if 140 * we're a guest. Skip the hyp-vectors work. 141 */ 142 if (!hyp_vecs_start) { 143 __this_cpu_write(bp_hardening_data.fn, fn); 144 return; 145 } 146 147 raw_spin_lock(&bp_lock); 148 for_each_possible_cpu(cpu) { 149 if (per_cpu(bp_hardening_data.fn, cpu) == fn) { 150 slot = per_cpu(bp_hardening_data.hyp_vectors_slot, cpu); 151 break; 152 } 153 } 154 155 if (slot == -1) { 156 slot = atomic_inc_return(&arm64_el2_vector_last_slot); 157 BUG_ON(slot >= BP_HARDEN_EL2_SLOTS); 158 __copy_hyp_vect_bpi(slot, hyp_vecs_start, hyp_vecs_end); 159 } 160 161 __this_cpu_write(bp_hardening_data.hyp_vectors_slot, slot); 162 __this_cpu_write(bp_hardening_data.fn, fn); 163 raw_spin_unlock(&bp_lock); 164 } 165 #else 166 #define __smccc_workaround_1_smc_start NULL 167 #define __smccc_workaround_1_smc_end NULL 168 169 static void install_bp_hardening_cb(bp_hardening_cb_t fn, 170 const char *hyp_vecs_start, 171 const char *hyp_vecs_end) 172 { 173 __this_cpu_write(bp_hardening_data.fn, fn); 174 } 175 #endif /* CONFIG_KVM_INDIRECT_VECTORS */ 176 177 #include <linux/arm-smccc.h> 178 179 static void call_smc_arch_workaround_1(void) 180 { 181 arm_smccc_1_1_smc(ARM_SMCCC_ARCH_WORKAROUND_1, NULL); 182 } 183 184 static void call_hvc_arch_workaround_1(void) 185 { 186 arm_smccc_1_1_hvc(ARM_SMCCC_ARCH_WORKAROUND_1, NULL); 187 } 188 189 static void qcom_link_stack_sanitization(void) 190 { 191 u64 tmp; 192 193 asm volatile("mov %0, x30 \n" 194 ".rept 16 \n" 195 "bl . + 4 \n" 196 ".endr \n" 197 "mov x30, %0 \n" 198 : "=&r" (tmp)); 199 } 200 201 static bool __nospectre_v2; 202 static int __init parse_nospectre_v2(char *str) 203 { 204 __nospectre_v2 = true; 205 return 0; 206 } 207 early_param("nospectre_v2", parse_nospectre_v2); 208 209 /* 210 * -1: No workaround 211 * 0: No workaround required 212 * 1: Workaround installed 213 */ 214 static int detect_harden_bp_fw(void) 215 { 216 bp_hardening_cb_t cb; 217 void *smccc_start, *smccc_end; 218 struct arm_smccc_res res; 219 u32 midr = read_cpuid_id(); 220 221 arm_smccc_1_1_invoke(ARM_SMCCC_ARCH_FEATURES_FUNC_ID, 222 ARM_SMCCC_ARCH_WORKAROUND_1, &res); 223 224 switch ((int)res.a0) { 225 case 1: 226 /* Firmware says we're just fine */ 227 return 0; 228 case 0: 229 break; 230 default: 231 return -1; 232 } 233 234 switch (arm_smccc_1_1_get_conduit()) { 235 case SMCCC_CONDUIT_HVC: 236 cb = call_hvc_arch_workaround_1; 237 /* This is a guest, no need to patch KVM vectors */ 238 smccc_start = NULL; 239 smccc_end = NULL; 240 break; 241 242 case SMCCC_CONDUIT_SMC: 243 cb = call_smc_arch_workaround_1; 244 smccc_start = __smccc_workaround_1_smc_start; 245 smccc_end = __smccc_workaround_1_smc_end; 246 break; 247 248 default: 249 return -1; 250 } 251 252 if (((midr & MIDR_CPU_MODEL_MASK) == MIDR_QCOM_FALKOR) || 253 ((midr & MIDR_CPU_MODEL_MASK) == MIDR_QCOM_FALKOR_V1)) 254 cb = qcom_link_stack_sanitization; 255 256 if (IS_ENABLED(CONFIG_HARDEN_BRANCH_PREDICTOR)) 257 install_bp_hardening_cb(cb, smccc_start, smccc_end); 258 259 return 1; 260 } 261 262 DEFINE_PER_CPU_READ_MOSTLY(u64, arm64_ssbd_callback_required); 263 264 int ssbd_state __read_mostly = ARM64_SSBD_KERNEL; 265 static bool __ssb_safe = true; 266 267 static const struct ssbd_options { 268 const char *str; 269 int state; 270 } ssbd_options[] = { 271 { "force-on", ARM64_SSBD_FORCE_ENABLE, }, 272 { "force-off", ARM64_SSBD_FORCE_DISABLE, }, 273 { "kernel", ARM64_SSBD_KERNEL, }, 274 }; 275 276 static int __init ssbd_cfg(char *buf) 277 { 278 int i; 279 280 if (!buf || !buf[0]) 281 return -EINVAL; 282 283 for (i = 0; i < ARRAY_SIZE(ssbd_options); i++) { 284 int len = strlen(ssbd_options[i].str); 285 286 if (strncmp(buf, ssbd_options[i].str, len)) 287 continue; 288 289 ssbd_state = ssbd_options[i].state; 290 return 0; 291 } 292 293 return -EINVAL; 294 } 295 early_param("ssbd", ssbd_cfg); 296 297 void __init arm64_update_smccc_conduit(struct alt_instr *alt, 298 __le32 *origptr, __le32 *updptr, 299 int nr_inst) 300 { 301 u32 insn; 302 303 BUG_ON(nr_inst != 1); 304 305 switch (arm_smccc_1_1_get_conduit()) { 306 case SMCCC_CONDUIT_HVC: 307 insn = aarch64_insn_get_hvc_value(); 308 break; 309 case SMCCC_CONDUIT_SMC: 310 insn = aarch64_insn_get_smc_value(); 311 break; 312 default: 313 return; 314 } 315 316 *updptr = cpu_to_le32(insn); 317 } 318 319 void __init arm64_enable_wa2_handling(struct alt_instr *alt, 320 __le32 *origptr, __le32 *updptr, 321 int nr_inst) 322 { 323 BUG_ON(nr_inst != 1); 324 /* 325 * Only allow mitigation on EL1 entry/exit and guest 326 * ARCH_WORKAROUND_2 handling if the SSBD state allows it to 327 * be flipped. 328 */ 329 if (arm64_get_ssbd_state() == ARM64_SSBD_KERNEL) 330 *updptr = cpu_to_le32(aarch64_insn_gen_nop()); 331 } 332 333 void arm64_set_ssbd_mitigation(bool state) 334 { 335 int conduit; 336 337 if (!IS_ENABLED(CONFIG_ARM64_SSBD)) { 338 pr_info_once("SSBD disabled by kernel configuration\n"); 339 return; 340 } 341 342 if (this_cpu_has_cap(ARM64_SSBS)) { 343 if (state) 344 asm volatile(SET_PSTATE_SSBS(0)); 345 else 346 asm volatile(SET_PSTATE_SSBS(1)); 347 return; 348 } 349 350 conduit = arm_smccc_1_1_invoke(ARM_SMCCC_ARCH_WORKAROUND_2, state, 351 NULL); 352 353 WARN_ON_ONCE(conduit == SMCCC_CONDUIT_NONE); 354 } 355 356 static bool has_ssbd_mitigation(const struct arm64_cpu_capabilities *entry, 357 int scope) 358 { 359 struct arm_smccc_res res; 360 bool required = true; 361 s32 val; 362 bool this_cpu_safe = false; 363 int conduit; 364 365 WARN_ON(scope != SCOPE_LOCAL_CPU || preemptible()); 366 367 if (cpu_mitigations_off()) 368 ssbd_state = ARM64_SSBD_FORCE_DISABLE; 369 370 /* delay setting __ssb_safe until we get a firmware response */ 371 if (is_midr_in_range_list(read_cpuid_id(), entry->midr_range_list)) 372 this_cpu_safe = true; 373 374 if (this_cpu_has_cap(ARM64_SSBS)) { 375 if (!this_cpu_safe) 376 __ssb_safe = false; 377 required = false; 378 goto out_printmsg; 379 } 380 381 conduit = arm_smccc_1_1_invoke(ARM_SMCCC_ARCH_FEATURES_FUNC_ID, 382 ARM_SMCCC_ARCH_WORKAROUND_2, &res); 383 384 if (conduit == SMCCC_CONDUIT_NONE) { 385 ssbd_state = ARM64_SSBD_UNKNOWN; 386 if (!this_cpu_safe) 387 __ssb_safe = false; 388 return false; 389 } 390 391 val = (s32)res.a0; 392 393 switch (val) { 394 case SMCCC_RET_NOT_SUPPORTED: 395 ssbd_state = ARM64_SSBD_UNKNOWN; 396 if (!this_cpu_safe) 397 __ssb_safe = false; 398 return false; 399 400 /* machines with mixed mitigation requirements must not return this */ 401 case SMCCC_RET_NOT_REQUIRED: 402 pr_info_once("%s mitigation not required\n", entry->desc); 403 ssbd_state = ARM64_SSBD_MITIGATED; 404 return false; 405 406 case SMCCC_RET_SUCCESS: 407 __ssb_safe = false; 408 required = true; 409 break; 410 411 case 1: /* Mitigation not required on this CPU */ 412 required = false; 413 break; 414 415 default: 416 WARN_ON(1); 417 if (!this_cpu_safe) 418 __ssb_safe = false; 419 return false; 420 } 421 422 switch (ssbd_state) { 423 case ARM64_SSBD_FORCE_DISABLE: 424 arm64_set_ssbd_mitigation(false); 425 required = false; 426 break; 427 428 case ARM64_SSBD_KERNEL: 429 if (required) { 430 __this_cpu_write(arm64_ssbd_callback_required, 1); 431 arm64_set_ssbd_mitigation(true); 432 } 433 break; 434 435 case ARM64_SSBD_FORCE_ENABLE: 436 arm64_set_ssbd_mitigation(true); 437 required = true; 438 break; 439 440 default: 441 WARN_ON(1); 442 break; 443 } 444 445 out_printmsg: 446 switch (ssbd_state) { 447 case ARM64_SSBD_FORCE_DISABLE: 448 pr_info_once("%s disabled from command-line\n", entry->desc); 449 break; 450 451 case ARM64_SSBD_FORCE_ENABLE: 452 pr_info_once("%s forced from command-line\n", entry->desc); 453 break; 454 } 455 456 return required; 457 } 458 459 /* known invulnerable cores */ 460 static const struct midr_range arm64_ssb_cpus[] = { 461 MIDR_ALL_VERSIONS(MIDR_CORTEX_A35), 462 MIDR_ALL_VERSIONS(MIDR_CORTEX_A53), 463 MIDR_ALL_VERSIONS(MIDR_CORTEX_A55), 464 MIDR_ALL_VERSIONS(MIDR_BRAHMA_B53), 465 {}, 466 }; 467 468 #ifdef CONFIG_ARM64_ERRATUM_1463225 469 DEFINE_PER_CPU(int, __in_cortex_a76_erratum_1463225_wa); 470 471 static bool 472 has_cortex_a76_erratum_1463225(const struct arm64_cpu_capabilities *entry, 473 int scope) 474 { 475 u32 midr = read_cpuid_id(); 476 /* Cortex-A76 r0p0 - r3p1 */ 477 struct midr_range range = MIDR_RANGE(MIDR_CORTEX_A76, 0, 0, 3, 1); 478 479 WARN_ON(scope != SCOPE_LOCAL_CPU || preemptible()); 480 return is_midr_in_range(midr, &range) && is_kernel_in_hyp_mode(); 481 } 482 #endif 483 484 static void __maybe_unused 485 cpu_enable_cache_maint_trap(const struct arm64_cpu_capabilities *__unused) 486 { 487 sysreg_clear_set(sctlr_el1, SCTLR_EL1_UCI, 0); 488 } 489 490 #define CAP_MIDR_RANGE(model, v_min, r_min, v_max, r_max) \ 491 .matches = is_affected_midr_range, \ 492 .midr_range = MIDR_RANGE(model, v_min, r_min, v_max, r_max) 493 494 #define CAP_MIDR_ALL_VERSIONS(model) \ 495 .matches = is_affected_midr_range, \ 496 .midr_range = MIDR_ALL_VERSIONS(model) 497 498 #define MIDR_FIXED(rev, revidr_mask) \ 499 .fixed_revs = (struct arm64_midr_revidr[]){{ (rev), (revidr_mask) }, {}} 500 501 #define ERRATA_MIDR_RANGE(model, v_min, r_min, v_max, r_max) \ 502 .type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM, \ 503 CAP_MIDR_RANGE(model, v_min, r_min, v_max, r_max) 504 505 #define CAP_MIDR_RANGE_LIST(list) \ 506 .matches = is_affected_midr_range_list, \ 507 .midr_range_list = list 508 509 /* Errata affecting a range of revisions of given model variant */ 510 #define ERRATA_MIDR_REV_RANGE(m, var, r_min, r_max) \ 511 ERRATA_MIDR_RANGE(m, var, r_min, var, r_max) 512 513 /* Errata affecting a single variant/revision of a model */ 514 #define ERRATA_MIDR_REV(model, var, rev) \ 515 ERRATA_MIDR_RANGE(model, var, rev, var, rev) 516 517 /* Errata affecting all variants/revisions of a given a model */ 518 #define ERRATA_MIDR_ALL_VERSIONS(model) \ 519 .type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM, \ 520 CAP_MIDR_ALL_VERSIONS(model) 521 522 /* Errata affecting a list of midr ranges, with same work around */ 523 #define ERRATA_MIDR_RANGE_LIST(midr_list) \ 524 .type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM, \ 525 CAP_MIDR_RANGE_LIST(midr_list) 526 527 /* Track overall mitigation state. We are only mitigated if all cores are ok */ 528 static bool __hardenbp_enab = true; 529 static bool __spectrev2_safe = true; 530 531 int get_spectre_v2_workaround_state(void) 532 { 533 if (__spectrev2_safe) 534 return ARM64_BP_HARDEN_NOT_REQUIRED; 535 536 if (!__hardenbp_enab) 537 return ARM64_BP_HARDEN_UNKNOWN; 538 539 return ARM64_BP_HARDEN_WA_NEEDED; 540 } 541 542 /* 543 * List of CPUs that do not need any Spectre-v2 mitigation at all. 544 */ 545 static const struct midr_range spectre_v2_safe_list[] = { 546 MIDR_ALL_VERSIONS(MIDR_CORTEX_A35), 547 MIDR_ALL_VERSIONS(MIDR_CORTEX_A53), 548 MIDR_ALL_VERSIONS(MIDR_CORTEX_A55), 549 MIDR_ALL_VERSIONS(MIDR_BRAHMA_B53), 550 MIDR_ALL_VERSIONS(MIDR_HISI_TSV110), 551 { /* sentinel */ } 552 }; 553 554 /* 555 * Track overall bp hardening for all heterogeneous cores in the machine. 556 * We are only considered "safe" if all booted cores are known safe. 557 */ 558 static bool __maybe_unused 559 check_branch_predictor(const struct arm64_cpu_capabilities *entry, int scope) 560 { 561 int need_wa; 562 563 WARN_ON(scope != SCOPE_LOCAL_CPU || preemptible()); 564 565 /* If the CPU has CSV2 set, we're safe */ 566 if (cpuid_feature_extract_unsigned_field(read_cpuid(ID_AA64PFR0_EL1), 567 ID_AA64PFR0_CSV2_SHIFT)) 568 return false; 569 570 /* Alternatively, we have a list of unaffected CPUs */ 571 if (is_midr_in_range_list(read_cpuid_id(), spectre_v2_safe_list)) 572 return false; 573 574 /* Fallback to firmware detection */ 575 need_wa = detect_harden_bp_fw(); 576 if (!need_wa) 577 return false; 578 579 __spectrev2_safe = false; 580 581 if (!IS_ENABLED(CONFIG_HARDEN_BRANCH_PREDICTOR)) { 582 pr_warn_once("spectrev2 mitigation disabled by kernel configuration\n"); 583 __hardenbp_enab = false; 584 return false; 585 } 586 587 /* forced off */ 588 if (__nospectre_v2 || cpu_mitigations_off()) { 589 pr_info_once("spectrev2 mitigation disabled by command line option\n"); 590 __hardenbp_enab = false; 591 return false; 592 } 593 594 if (need_wa < 0) { 595 pr_warn_once("ARM_SMCCC_ARCH_WORKAROUND_1 missing from firmware\n"); 596 __hardenbp_enab = false; 597 } 598 599 return (need_wa > 0); 600 } 601 602 static const __maybe_unused struct midr_range tx2_family_cpus[] = { 603 MIDR_ALL_VERSIONS(MIDR_BRCM_VULCAN), 604 MIDR_ALL_VERSIONS(MIDR_CAVIUM_THUNDERX2), 605 {}, 606 }; 607 608 static bool __maybe_unused 609 needs_tx2_tvm_workaround(const struct arm64_cpu_capabilities *entry, 610 int scope) 611 { 612 int i; 613 614 if (!is_affected_midr_range_list(entry, scope) || 615 !is_hyp_mode_available()) 616 return false; 617 618 for_each_possible_cpu(i) { 619 if (MPIDR_AFFINITY_LEVEL(cpu_logical_map(i), 0) != 0) 620 return true; 621 } 622 623 return false; 624 } 625 626 static bool __maybe_unused 627 has_neoverse_n1_erratum_1542419(const struct arm64_cpu_capabilities *entry, 628 int scope) 629 { 630 u32 midr = read_cpuid_id(); 631 bool has_dic = read_cpuid_cachetype() & BIT(CTR_DIC_SHIFT); 632 const struct midr_range range = MIDR_ALL_VERSIONS(MIDR_NEOVERSE_N1); 633 634 WARN_ON(scope != SCOPE_LOCAL_CPU || preemptible()); 635 return is_midr_in_range(midr, &range) && has_dic; 636 } 637 638 #if defined(CONFIG_HARDEN_EL2_VECTORS) || defined(CONFIG_ARM64_ERRATUM_1319367) 639 640 static const struct midr_range ca57_a72[] = { 641 MIDR_ALL_VERSIONS(MIDR_CORTEX_A57), 642 MIDR_ALL_VERSIONS(MIDR_CORTEX_A72), 643 {}, 644 }; 645 646 #endif 647 648 #ifdef CONFIG_ARM64_WORKAROUND_REPEAT_TLBI 649 static const struct arm64_cpu_capabilities arm64_repeat_tlbi_list[] = { 650 #ifdef CONFIG_QCOM_FALKOR_ERRATUM_1009 651 { 652 ERRATA_MIDR_REV(MIDR_QCOM_FALKOR_V1, 0, 0) 653 }, 654 { 655 .midr_range.model = MIDR_QCOM_KRYO, 656 .matches = is_kryo_midr, 657 }, 658 #endif 659 #ifdef CONFIG_ARM64_ERRATUM_1286807 660 { 661 ERRATA_MIDR_RANGE(MIDR_CORTEX_A76, 0, 0, 3, 0), 662 }, 663 #endif 664 {}, 665 }; 666 #endif 667 668 #ifdef CONFIG_CAVIUM_ERRATUM_27456 669 const struct midr_range cavium_erratum_27456_cpus[] = { 670 /* Cavium ThunderX, T88 pass 1.x - 2.1 */ 671 MIDR_RANGE(MIDR_THUNDERX, 0, 0, 1, 1), 672 /* Cavium ThunderX, T81 pass 1.0 */ 673 MIDR_REV(MIDR_THUNDERX_81XX, 0, 0), 674 {}, 675 }; 676 #endif 677 678 #ifdef CONFIG_CAVIUM_ERRATUM_30115 679 static const struct midr_range cavium_erratum_30115_cpus[] = { 680 /* Cavium ThunderX, T88 pass 1.x - 2.2 */ 681 MIDR_RANGE(MIDR_THUNDERX, 0, 0, 1, 2), 682 /* Cavium ThunderX, T81 pass 1.0 - 1.2 */ 683 MIDR_REV_RANGE(MIDR_THUNDERX_81XX, 0, 0, 2), 684 /* Cavium ThunderX, T83 pass 1.0 */ 685 MIDR_REV(MIDR_THUNDERX_83XX, 0, 0), 686 {}, 687 }; 688 #endif 689 690 #ifdef CONFIG_QCOM_FALKOR_ERRATUM_1003 691 static const struct arm64_cpu_capabilities qcom_erratum_1003_list[] = { 692 { 693 ERRATA_MIDR_REV(MIDR_QCOM_FALKOR_V1, 0, 0), 694 }, 695 { 696 .midr_range.model = MIDR_QCOM_KRYO, 697 .matches = is_kryo_midr, 698 }, 699 {}, 700 }; 701 #endif 702 703 #ifdef CONFIG_ARM64_WORKAROUND_CLEAN_CACHE 704 static const struct midr_range workaround_clean_cache[] = { 705 #if defined(CONFIG_ARM64_ERRATUM_826319) || \ 706 defined(CONFIG_ARM64_ERRATUM_827319) || \ 707 defined(CONFIG_ARM64_ERRATUM_824069) 708 /* Cortex-A53 r0p[012]: ARM errata 826319, 827319, 824069 */ 709 MIDR_REV_RANGE(MIDR_CORTEX_A53, 0, 0, 2), 710 #endif 711 #ifdef CONFIG_ARM64_ERRATUM_819472 712 /* Cortex-A53 r0p[01] : ARM errata 819472 */ 713 MIDR_REV_RANGE(MIDR_CORTEX_A53, 0, 0, 1), 714 #endif 715 {}, 716 }; 717 #endif 718 719 #ifdef CONFIG_ARM64_ERRATUM_1418040 720 /* 721 * - 1188873 affects r0p0 to r2p0 722 * - 1418040 affects r0p0 to r3p1 723 */ 724 static const struct midr_range erratum_1418040_list[] = { 725 /* Cortex-A76 r0p0 to r3p1 */ 726 MIDR_RANGE(MIDR_CORTEX_A76, 0, 0, 3, 1), 727 /* Neoverse-N1 r0p0 to r3p1 */ 728 MIDR_RANGE(MIDR_NEOVERSE_N1, 0, 0, 3, 1), 729 {}, 730 }; 731 #endif 732 733 #ifdef CONFIG_ARM64_ERRATUM_845719 734 static const struct midr_range erratum_845719_list[] = { 735 /* Cortex-A53 r0p[01234] */ 736 MIDR_REV_RANGE(MIDR_CORTEX_A53, 0, 0, 4), 737 /* Brahma-B53 r0p[0] */ 738 MIDR_REV(MIDR_BRAHMA_B53, 0, 0), 739 {}, 740 }; 741 #endif 742 743 #ifdef CONFIG_ARM64_ERRATUM_843419 744 static const struct arm64_cpu_capabilities erratum_843419_list[] = { 745 { 746 /* Cortex-A53 r0p[01234] */ 747 .matches = is_affected_midr_range, 748 ERRATA_MIDR_REV_RANGE(MIDR_CORTEX_A53, 0, 0, 4), 749 MIDR_FIXED(0x4, BIT(8)), 750 }, 751 { 752 /* Brahma-B53 r0p[0] */ 753 .matches = is_affected_midr_range, 754 ERRATA_MIDR_REV(MIDR_BRAHMA_B53, 0, 0), 755 }, 756 {}, 757 }; 758 #endif 759 760 const struct arm64_cpu_capabilities arm64_errata[] = { 761 #ifdef CONFIG_ARM64_WORKAROUND_CLEAN_CACHE 762 { 763 .desc = "ARM errata 826319, 827319, 824069, 819472", 764 .capability = ARM64_WORKAROUND_CLEAN_CACHE, 765 ERRATA_MIDR_RANGE_LIST(workaround_clean_cache), 766 .cpu_enable = cpu_enable_cache_maint_trap, 767 }, 768 #endif 769 #ifdef CONFIG_ARM64_ERRATUM_832075 770 { 771 /* Cortex-A57 r0p0 - r1p2 */ 772 .desc = "ARM erratum 832075", 773 .capability = ARM64_WORKAROUND_DEVICE_LOAD_ACQUIRE, 774 ERRATA_MIDR_RANGE(MIDR_CORTEX_A57, 775 0, 0, 776 1, 2), 777 }, 778 #endif 779 #ifdef CONFIG_ARM64_ERRATUM_834220 780 { 781 /* Cortex-A57 r0p0 - r1p2 */ 782 .desc = "ARM erratum 834220", 783 .capability = ARM64_WORKAROUND_834220, 784 ERRATA_MIDR_RANGE(MIDR_CORTEX_A57, 785 0, 0, 786 1, 2), 787 }, 788 #endif 789 #ifdef CONFIG_ARM64_ERRATUM_843419 790 { 791 .desc = "ARM erratum 843419", 792 .capability = ARM64_WORKAROUND_843419, 793 .type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM, 794 .matches = cpucap_multi_entry_cap_matches, 795 .match_list = erratum_843419_list, 796 }, 797 #endif 798 #ifdef CONFIG_ARM64_ERRATUM_845719 799 { 800 .desc = "ARM erratum 845719", 801 .capability = ARM64_WORKAROUND_845719, 802 ERRATA_MIDR_RANGE_LIST(erratum_845719_list), 803 }, 804 #endif 805 #ifdef CONFIG_CAVIUM_ERRATUM_23154 806 { 807 /* Cavium ThunderX, pass 1.x */ 808 .desc = "Cavium erratum 23154", 809 .capability = ARM64_WORKAROUND_CAVIUM_23154, 810 ERRATA_MIDR_REV_RANGE(MIDR_THUNDERX, 0, 0, 1), 811 }, 812 #endif 813 #ifdef CONFIG_CAVIUM_ERRATUM_27456 814 { 815 .desc = "Cavium erratum 27456", 816 .capability = ARM64_WORKAROUND_CAVIUM_27456, 817 ERRATA_MIDR_RANGE_LIST(cavium_erratum_27456_cpus), 818 }, 819 #endif 820 #ifdef CONFIG_CAVIUM_ERRATUM_30115 821 { 822 .desc = "Cavium erratum 30115", 823 .capability = ARM64_WORKAROUND_CAVIUM_30115, 824 ERRATA_MIDR_RANGE_LIST(cavium_erratum_30115_cpus), 825 }, 826 #endif 827 { 828 .desc = "Mismatched cache type (CTR_EL0)", 829 .capability = ARM64_MISMATCHED_CACHE_TYPE, 830 .matches = has_mismatched_cache_type, 831 .type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM, 832 .cpu_enable = cpu_enable_trap_ctr_access, 833 }, 834 #ifdef CONFIG_QCOM_FALKOR_ERRATUM_1003 835 { 836 .desc = "Qualcomm Technologies Falkor/Kryo erratum 1003", 837 .capability = ARM64_WORKAROUND_QCOM_FALKOR_E1003, 838 .type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM, 839 .matches = cpucap_multi_entry_cap_matches, 840 .match_list = qcom_erratum_1003_list, 841 }, 842 #endif 843 #ifdef CONFIG_ARM64_WORKAROUND_REPEAT_TLBI 844 { 845 .desc = "Qualcomm erratum 1009, ARM erratum 1286807", 846 .capability = ARM64_WORKAROUND_REPEAT_TLBI, 847 .type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM, 848 .matches = cpucap_multi_entry_cap_matches, 849 .match_list = arm64_repeat_tlbi_list, 850 }, 851 #endif 852 #ifdef CONFIG_ARM64_ERRATUM_858921 853 { 854 /* Cortex-A73 all versions */ 855 .desc = "ARM erratum 858921", 856 .capability = ARM64_WORKAROUND_858921, 857 ERRATA_MIDR_ALL_VERSIONS(MIDR_CORTEX_A73), 858 }, 859 #endif 860 { 861 .capability = ARM64_HARDEN_BRANCH_PREDICTOR, 862 .type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM, 863 .matches = check_branch_predictor, 864 }, 865 #ifdef CONFIG_HARDEN_EL2_VECTORS 866 { 867 .desc = "EL2 vector hardening", 868 .capability = ARM64_HARDEN_EL2_VECTORS, 869 ERRATA_MIDR_RANGE_LIST(ca57_a72), 870 }, 871 #endif 872 { 873 .desc = "Speculative Store Bypass Disable", 874 .capability = ARM64_SSBD, 875 .type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM, 876 .matches = has_ssbd_mitigation, 877 .midr_range_list = arm64_ssb_cpus, 878 }, 879 #ifdef CONFIG_ARM64_ERRATUM_1418040 880 { 881 .desc = "ARM erratum 1418040", 882 .capability = ARM64_WORKAROUND_1418040, 883 ERRATA_MIDR_RANGE_LIST(erratum_1418040_list), 884 }, 885 #endif 886 #ifdef CONFIG_ARM64_ERRATUM_1165522 887 { 888 /* Cortex-A76 r0p0 to r2p0 */ 889 .desc = "ARM erratum 1165522", 890 .capability = ARM64_WORKAROUND_1165522, 891 ERRATA_MIDR_RANGE(MIDR_CORTEX_A76, 0, 0, 2, 0), 892 }, 893 #endif 894 #ifdef CONFIG_ARM64_ERRATUM_1463225 895 { 896 .desc = "ARM erratum 1463225", 897 .capability = ARM64_WORKAROUND_1463225, 898 .type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM, 899 .matches = has_cortex_a76_erratum_1463225, 900 }, 901 #endif 902 #ifdef CONFIG_CAVIUM_TX2_ERRATUM_219 903 { 904 .desc = "Cavium ThunderX2 erratum 219 (KVM guest sysreg trapping)", 905 .capability = ARM64_WORKAROUND_CAVIUM_TX2_219_TVM, 906 ERRATA_MIDR_RANGE_LIST(tx2_family_cpus), 907 .matches = needs_tx2_tvm_workaround, 908 }, 909 { 910 .desc = "Cavium ThunderX2 erratum 219 (PRFM removal)", 911 .capability = ARM64_WORKAROUND_CAVIUM_TX2_219_PRFM, 912 ERRATA_MIDR_RANGE_LIST(tx2_family_cpus), 913 }, 914 #endif 915 #ifdef CONFIG_ARM64_ERRATUM_1542419 916 { 917 /* we depend on the firmware portion for correctness */ 918 .desc = "ARM erratum 1542419 (kernel portion)", 919 .capability = ARM64_WORKAROUND_1542419, 920 .type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM, 921 .matches = has_neoverse_n1_erratum_1542419, 922 .cpu_enable = cpu_enable_trap_ctr_access, 923 }, 924 #endif 925 #ifdef CONFIG_ARM64_ERRATUM_1319367 926 { 927 .desc = "ARM erratum 1319367", 928 .capability = ARM64_WORKAROUND_1319367, 929 ERRATA_MIDR_RANGE_LIST(ca57_a72), 930 }, 931 #endif 932 { 933 } 934 }; 935 936 ssize_t cpu_show_spectre_v1(struct device *dev, struct device_attribute *attr, 937 char *buf) 938 { 939 return sprintf(buf, "Mitigation: __user pointer sanitization\n"); 940 } 941 942 ssize_t cpu_show_spectre_v2(struct device *dev, struct device_attribute *attr, 943 char *buf) 944 { 945 switch (get_spectre_v2_workaround_state()) { 946 case ARM64_BP_HARDEN_NOT_REQUIRED: 947 return sprintf(buf, "Not affected\n"); 948 case ARM64_BP_HARDEN_WA_NEEDED: 949 return sprintf(buf, "Mitigation: Branch predictor hardening\n"); 950 case ARM64_BP_HARDEN_UNKNOWN: 951 default: 952 return sprintf(buf, "Vulnerable\n"); 953 } 954 } 955 956 ssize_t cpu_show_spec_store_bypass(struct device *dev, 957 struct device_attribute *attr, char *buf) 958 { 959 if (__ssb_safe) 960 return sprintf(buf, "Not affected\n"); 961 962 switch (ssbd_state) { 963 case ARM64_SSBD_KERNEL: 964 case ARM64_SSBD_FORCE_ENABLE: 965 if (IS_ENABLED(CONFIG_ARM64_SSBD)) 966 return sprintf(buf, 967 "Mitigation: Speculative Store Bypass disabled via prctl\n"); 968 } 969 970 return sprintf(buf, "Vulnerable\n"); 971 } 972