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/psci.h> 10 #include <linux/types.h> 11 #include <linux/cpu.h> 12 #include <asm/cpu.h> 13 #include <asm/cputype.h> 14 #include <asm/cpufeature.h> 15 #include <asm/smp_plat.h> 16 17 static bool __maybe_unused 18 is_affected_midr_range(const struct arm64_cpu_capabilities *entry, int scope) 19 { 20 const struct arm64_midr_revidr *fix; 21 u32 midr = read_cpuid_id(), revidr; 22 23 WARN_ON(scope != SCOPE_LOCAL_CPU || preemptible()); 24 if (!is_midr_in_range(midr, &entry->midr_range)) 25 return false; 26 27 midr &= MIDR_REVISION_MASK | MIDR_VARIANT_MASK; 28 revidr = read_cpuid(REVIDR_EL1); 29 for (fix = entry->fixed_revs; fix && fix->revidr_mask; fix++) 30 if (midr == fix->midr_rv && (revidr & fix->revidr_mask)) 31 return false; 32 33 return true; 34 } 35 36 static bool __maybe_unused 37 is_affected_midr_range_list(const struct arm64_cpu_capabilities *entry, 38 int scope) 39 { 40 WARN_ON(scope != SCOPE_LOCAL_CPU || preemptible()); 41 return is_midr_in_range_list(read_cpuid_id(), entry->midr_range_list); 42 } 43 44 static bool __maybe_unused 45 is_kryo_midr(const struct arm64_cpu_capabilities *entry, int scope) 46 { 47 u32 model; 48 49 WARN_ON(scope != SCOPE_LOCAL_CPU || preemptible()); 50 51 model = read_cpuid_id(); 52 model &= MIDR_IMPLEMENTOR_MASK | (0xf00 << MIDR_PARTNUM_SHIFT) | 53 MIDR_ARCHITECTURE_MASK; 54 55 return model == entry->midr_range.model; 56 } 57 58 static bool 59 has_mismatched_cache_type(const struct arm64_cpu_capabilities *entry, 60 int scope) 61 { 62 u64 mask = arm64_ftr_reg_ctrel0.strict_mask; 63 u64 sys = arm64_ftr_reg_ctrel0.sys_val & mask; 64 u64 ctr_raw, ctr_real; 65 66 WARN_ON(scope != SCOPE_LOCAL_CPU || preemptible()); 67 68 /* 69 * We want to make sure that all the CPUs in the system expose 70 * a consistent CTR_EL0 to make sure that applications behaves 71 * correctly with migration. 72 * 73 * If a CPU has CTR_EL0.IDC but does not advertise it via CTR_EL0 : 74 * 75 * 1) It is safe if the system doesn't support IDC, as CPU anyway 76 * reports IDC = 0, consistent with the rest. 77 * 78 * 2) If the system has IDC, it is still safe as we trap CTR_EL0 79 * access on this CPU via the ARM64_HAS_CACHE_IDC capability. 80 * 81 * So, we need to make sure either the raw CTR_EL0 or the effective 82 * CTR_EL0 matches the system's copy to allow a secondary CPU to boot. 83 */ 84 ctr_raw = read_cpuid_cachetype() & mask; 85 ctr_real = read_cpuid_effective_cachetype() & mask; 86 87 return (ctr_real != sys) && (ctr_raw != sys); 88 } 89 90 static void 91 cpu_enable_trap_ctr_access(const struct arm64_cpu_capabilities *__unused) 92 { 93 u64 mask = arm64_ftr_reg_ctrel0.strict_mask; 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 sysreg_clear_set(sctlr_el1, SCTLR_EL1_UCT, 0); 99 } 100 101 atomic_t arm64_el2_vector_last_slot = ATOMIC_INIT(-1); 102 103 #include <asm/mmu_context.h> 104 #include <asm/cacheflush.h> 105 106 DEFINE_PER_CPU_READ_MOSTLY(struct bp_hardening_data, bp_hardening_data); 107 108 #ifdef CONFIG_KVM_INDIRECT_VECTORS 109 extern char __smccc_workaround_1_smc_start[]; 110 extern char __smccc_workaround_1_smc_end[]; 111 112 static void __copy_hyp_vect_bpi(int slot, const char *hyp_vecs_start, 113 const char *hyp_vecs_end) 114 { 115 void *dst = lm_alias(__bp_harden_hyp_vecs_start + slot * SZ_2K); 116 int i; 117 118 for (i = 0; i < SZ_2K; i += 0x80) 119 memcpy(dst + i, hyp_vecs_start, hyp_vecs_end - hyp_vecs_start); 120 121 __flush_icache_range((uintptr_t)dst, (uintptr_t)dst + SZ_2K); 122 } 123 124 static void install_bp_hardening_cb(bp_hardening_cb_t fn, 125 const char *hyp_vecs_start, 126 const char *hyp_vecs_end) 127 { 128 static DEFINE_RAW_SPINLOCK(bp_lock); 129 int cpu, slot = -1; 130 131 /* 132 * detect_harden_bp_fw() passes NULL for the hyp_vecs start/end if 133 * we're a guest. Skip the hyp-vectors work. 134 */ 135 if (!hyp_vecs_start) { 136 __this_cpu_write(bp_hardening_data.fn, fn); 137 return; 138 } 139 140 raw_spin_lock(&bp_lock); 141 for_each_possible_cpu(cpu) { 142 if (per_cpu(bp_hardening_data.fn, cpu) == fn) { 143 slot = per_cpu(bp_hardening_data.hyp_vectors_slot, cpu); 144 break; 145 } 146 } 147 148 if (slot == -1) { 149 slot = atomic_inc_return(&arm64_el2_vector_last_slot); 150 BUG_ON(slot >= BP_HARDEN_EL2_SLOTS); 151 __copy_hyp_vect_bpi(slot, hyp_vecs_start, hyp_vecs_end); 152 } 153 154 __this_cpu_write(bp_hardening_data.hyp_vectors_slot, slot); 155 __this_cpu_write(bp_hardening_data.fn, fn); 156 raw_spin_unlock(&bp_lock); 157 } 158 #else 159 #define __smccc_workaround_1_smc_start NULL 160 #define __smccc_workaround_1_smc_end NULL 161 162 static void install_bp_hardening_cb(bp_hardening_cb_t fn, 163 const char *hyp_vecs_start, 164 const char *hyp_vecs_end) 165 { 166 __this_cpu_write(bp_hardening_data.fn, fn); 167 } 168 #endif /* CONFIG_KVM_INDIRECT_VECTORS */ 169 170 #include <uapi/linux/psci.h> 171 #include <linux/arm-smccc.h> 172 #include <linux/psci.h> 173 174 static void call_smc_arch_workaround_1(void) 175 { 176 arm_smccc_1_1_smc(ARM_SMCCC_ARCH_WORKAROUND_1, NULL); 177 } 178 179 static void call_hvc_arch_workaround_1(void) 180 { 181 arm_smccc_1_1_hvc(ARM_SMCCC_ARCH_WORKAROUND_1, NULL); 182 } 183 184 static void qcom_link_stack_sanitization(void) 185 { 186 u64 tmp; 187 188 asm volatile("mov %0, x30 \n" 189 ".rept 16 \n" 190 "bl . + 4 \n" 191 ".endr \n" 192 "mov x30, %0 \n" 193 : "=&r" (tmp)); 194 } 195 196 static bool __nospectre_v2; 197 static int __init parse_nospectre_v2(char *str) 198 { 199 __nospectre_v2 = true; 200 return 0; 201 } 202 early_param("nospectre_v2", parse_nospectre_v2); 203 204 /* 205 * -1: No workaround 206 * 0: No workaround required 207 * 1: Workaround installed 208 */ 209 static int detect_harden_bp_fw(void) 210 { 211 bp_hardening_cb_t cb; 212 void *smccc_start, *smccc_end; 213 struct arm_smccc_res res; 214 u32 midr = read_cpuid_id(); 215 216 if (psci_ops.smccc_version == SMCCC_VERSION_1_0) 217 return -1; 218 219 switch (psci_ops.conduit) { 220 case PSCI_CONDUIT_HVC: 221 arm_smccc_1_1_hvc(ARM_SMCCC_ARCH_FEATURES_FUNC_ID, 222 ARM_SMCCC_ARCH_WORKAROUND_1, &res); 223 switch ((int)res.a0) { 224 case 1: 225 /* Firmware says we're just fine */ 226 return 0; 227 case 0: 228 cb = call_hvc_arch_workaround_1; 229 /* This is a guest, no need to patch KVM vectors */ 230 smccc_start = NULL; 231 smccc_end = NULL; 232 break; 233 default: 234 return -1; 235 } 236 break; 237 238 case PSCI_CONDUIT_SMC: 239 arm_smccc_1_1_smc(ARM_SMCCC_ARCH_FEATURES_FUNC_ID, 240 ARM_SMCCC_ARCH_WORKAROUND_1, &res); 241 switch ((int)res.a0) { 242 case 1: 243 /* Firmware says we're just fine */ 244 return 0; 245 case 0: 246 cb = call_smc_arch_workaround_1; 247 smccc_start = __smccc_workaround_1_smc_start; 248 smccc_end = __smccc_workaround_1_smc_end; 249 break; 250 default: 251 return -1; 252 } 253 break; 254 255 default: 256 return -1; 257 } 258 259 if (((midr & MIDR_CPU_MODEL_MASK) == MIDR_QCOM_FALKOR) || 260 ((midr & MIDR_CPU_MODEL_MASK) == MIDR_QCOM_FALKOR_V1)) 261 cb = qcom_link_stack_sanitization; 262 263 if (IS_ENABLED(CONFIG_HARDEN_BRANCH_PREDICTOR)) 264 install_bp_hardening_cb(cb, smccc_start, smccc_end); 265 266 return 1; 267 } 268 269 DEFINE_PER_CPU_READ_MOSTLY(u64, arm64_ssbd_callback_required); 270 271 int ssbd_state __read_mostly = ARM64_SSBD_KERNEL; 272 static bool __ssb_safe = true; 273 274 static const struct ssbd_options { 275 const char *str; 276 int state; 277 } ssbd_options[] = { 278 { "force-on", ARM64_SSBD_FORCE_ENABLE, }, 279 { "force-off", ARM64_SSBD_FORCE_DISABLE, }, 280 { "kernel", ARM64_SSBD_KERNEL, }, 281 }; 282 283 static int __init ssbd_cfg(char *buf) 284 { 285 int i; 286 287 if (!buf || !buf[0]) 288 return -EINVAL; 289 290 for (i = 0; i < ARRAY_SIZE(ssbd_options); i++) { 291 int len = strlen(ssbd_options[i].str); 292 293 if (strncmp(buf, ssbd_options[i].str, len)) 294 continue; 295 296 ssbd_state = ssbd_options[i].state; 297 return 0; 298 } 299 300 return -EINVAL; 301 } 302 early_param("ssbd", ssbd_cfg); 303 304 void __init arm64_update_smccc_conduit(struct alt_instr *alt, 305 __le32 *origptr, __le32 *updptr, 306 int nr_inst) 307 { 308 u32 insn; 309 310 BUG_ON(nr_inst != 1); 311 312 switch (psci_ops.conduit) { 313 case PSCI_CONDUIT_HVC: 314 insn = aarch64_insn_get_hvc_value(); 315 break; 316 case PSCI_CONDUIT_SMC: 317 insn = aarch64_insn_get_smc_value(); 318 break; 319 default: 320 return; 321 } 322 323 *updptr = cpu_to_le32(insn); 324 } 325 326 void __init arm64_enable_wa2_handling(struct alt_instr *alt, 327 __le32 *origptr, __le32 *updptr, 328 int nr_inst) 329 { 330 BUG_ON(nr_inst != 1); 331 /* 332 * Only allow mitigation on EL1 entry/exit and guest 333 * ARCH_WORKAROUND_2 handling if the SSBD state allows it to 334 * be flipped. 335 */ 336 if (arm64_get_ssbd_state() == ARM64_SSBD_KERNEL) 337 *updptr = cpu_to_le32(aarch64_insn_gen_nop()); 338 } 339 340 void arm64_set_ssbd_mitigation(bool state) 341 { 342 if (!IS_ENABLED(CONFIG_ARM64_SSBD)) { 343 pr_info_once("SSBD disabled by kernel configuration\n"); 344 return; 345 } 346 347 if (this_cpu_has_cap(ARM64_SSBS)) { 348 if (state) 349 asm volatile(SET_PSTATE_SSBS(0)); 350 else 351 asm volatile(SET_PSTATE_SSBS(1)); 352 return; 353 } 354 355 switch (psci_ops.conduit) { 356 case PSCI_CONDUIT_HVC: 357 arm_smccc_1_1_hvc(ARM_SMCCC_ARCH_WORKAROUND_2, state, NULL); 358 break; 359 360 case PSCI_CONDUIT_SMC: 361 arm_smccc_1_1_smc(ARM_SMCCC_ARCH_WORKAROUND_2, state, NULL); 362 break; 363 364 default: 365 WARN_ON_ONCE(1); 366 break; 367 } 368 } 369 370 static bool has_ssbd_mitigation(const struct arm64_cpu_capabilities *entry, 371 int scope) 372 { 373 struct arm_smccc_res res; 374 bool required = true; 375 s32 val; 376 bool this_cpu_safe = false; 377 378 WARN_ON(scope != SCOPE_LOCAL_CPU || preemptible()); 379 380 if (cpu_mitigations_off()) 381 ssbd_state = ARM64_SSBD_FORCE_DISABLE; 382 383 /* delay setting __ssb_safe until we get a firmware response */ 384 if (is_midr_in_range_list(read_cpuid_id(), entry->midr_range_list)) 385 this_cpu_safe = true; 386 387 if (this_cpu_has_cap(ARM64_SSBS)) { 388 if (!this_cpu_safe) 389 __ssb_safe = false; 390 required = false; 391 goto out_printmsg; 392 } 393 394 if (psci_ops.smccc_version == SMCCC_VERSION_1_0) { 395 ssbd_state = ARM64_SSBD_UNKNOWN; 396 if (!this_cpu_safe) 397 __ssb_safe = false; 398 return false; 399 } 400 401 switch (psci_ops.conduit) { 402 case PSCI_CONDUIT_HVC: 403 arm_smccc_1_1_hvc(ARM_SMCCC_ARCH_FEATURES_FUNC_ID, 404 ARM_SMCCC_ARCH_WORKAROUND_2, &res); 405 break; 406 407 case PSCI_CONDUIT_SMC: 408 arm_smccc_1_1_smc(ARM_SMCCC_ARCH_FEATURES_FUNC_ID, 409 ARM_SMCCC_ARCH_WORKAROUND_2, &res); 410 break; 411 412 default: 413 ssbd_state = ARM64_SSBD_UNKNOWN; 414 if (!this_cpu_safe) 415 __ssb_safe = false; 416 return false; 417 } 418 419 val = (s32)res.a0; 420 421 switch (val) { 422 case SMCCC_RET_NOT_SUPPORTED: 423 ssbd_state = ARM64_SSBD_UNKNOWN; 424 if (!this_cpu_safe) 425 __ssb_safe = false; 426 return false; 427 428 /* machines with mixed mitigation requirements must not return this */ 429 case SMCCC_RET_NOT_REQUIRED: 430 pr_info_once("%s mitigation not required\n", entry->desc); 431 ssbd_state = ARM64_SSBD_MITIGATED; 432 return false; 433 434 case SMCCC_RET_SUCCESS: 435 __ssb_safe = false; 436 required = true; 437 break; 438 439 case 1: /* Mitigation not required on this CPU */ 440 required = false; 441 break; 442 443 default: 444 WARN_ON(1); 445 if (!this_cpu_safe) 446 __ssb_safe = false; 447 return false; 448 } 449 450 switch (ssbd_state) { 451 case ARM64_SSBD_FORCE_DISABLE: 452 arm64_set_ssbd_mitigation(false); 453 required = false; 454 break; 455 456 case ARM64_SSBD_KERNEL: 457 if (required) { 458 __this_cpu_write(arm64_ssbd_callback_required, 1); 459 arm64_set_ssbd_mitigation(true); 460 } 461 break; 462 463 case ARM64_SSBD_FORCE_ENABLE: 464 arm64_set_ssbd_mitigation(true); 465 required = true; 466 break; 467 468 default: 469 WARN_ON(1); 470 break; 471 } 472 473 out_printmsg: 474 switch (ssbd_state) { 475 case ARM64_SSBD_FORCE_DISABLE: 476 pr_info_once("%s disabled from command-line\n", entry->desc); 477 break; 478 479 case ARM64_SSBD_FORCE_ENABLE: 480 pr_info_once("%s forced from command-line\n", entry->desc); 481 break; 482 } 483 484 return required; 485 } 486 487 /* known invulnerable cores */ 488 static const struct midr_range arm64_ssb_cpus[] = { 489 MIDR_ALL_VERSIONS(MIDR_CORTEX_A35), 490 MIDR_ALL_VERSIONS(MIDR_CORTEX_A53), 491 MIDR_ALL_VERSIONS(MIDR_CORTEX_A55), 492 {}, 493 }; 494 495 #ifdef CONFIG_ARM64_ERRATUM_1463225 496 DEFINE_PER_CPU(int, __in_cortex_a76_erratum_1463225_wa); 497 498 static bool 499 has_cortex_a76_erratum_1463225(const struct arm64_cpu_capabilities *entry, 500 int scope) 501 { 502 u32 midr = read_cpuid_id(); 503 /* Cortex-A76 r0p0 - r3p1 */ 504 struct midr_range range = MIDR_RANGE(MIDR_CORTEX_A76, 0, 0, 3, 1); 505 506 WARN_ON(scope != SCOPE_LOCAL_CPU || preemptible()); 507 return is_midr_in_range(midr, &range) && is_kernel_in_hyp_mode(); 508 } 509 #endif 510 511 static void __maybe_unused 512 cpu_enable_cache_maint_trap(const struct arm64_cpu_capabilities *__unused) 513 { 514 sysreg_clear_set(sctlr_el1, SCTLR_EL1_UCI, 0); 515 } 516 517 #define CAP_MIDR_RANGE(model, v_min, r_min, v_max, r_max) \ 518 .matches = is_affected_midr_range, \ 519 .midr_range = MIDR_RANGE(model, v_min, r_min, v_max, r_max) 520 521 #define CAP_MIDR_ALL_VERSIONS(model) \ 522 .matches = is_affected_midr_range, \ 523 .midr_range = MIDR_ALL_VERSIONS(model) 524 525 #define MIDR_FIXED(rev, revidr_mask) \ 526 .fixed_revs = (struct arm64_midr_revidr[]){{ (rev), (revidr_mask) }, {}} 527 528 #define ERRATA_MIDR_RANGE(model, v_min, r_min, v_max, r_max) \ 529 .type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM, \ 530 CAP_MIDR_RANGE(model, v_min, r_min, v_max, r_max) 531 532 #define CAP_MIDR_RANGE_LIST(list) \ 533 .matches = is_affected_midr_range_list, \ 534 .midr_range_list = list 535 536 /* Errata affecting a range of revisions of given model variant */ 537 #define ERRATA_MIDR_REV_RANGE(m, var, r_min, r_max) \ 538 ERRATA_MIDR_RANGE(m, var, r_min, var, r_max) 539 540 /* Errata affecting a single variant/revision of a model */ 541 #define ERRATA_MIDR_REV(model, var, rev) \ 542 ERRATA_MIDR_RANGE(model, var, rev, var, rev) 543 544 /* Errata affecting all variants/revisions of a given a model */ 545 #define ERRATA_MIDR_ALL_VERSIONS(model) \ 546 .type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM, \ 547 CAP_MIDR_ALL_VERSIONS(model) 548 549 /* Errata affecting a list of midr ranges, with same work around */ 550 #define ERRATA_MIDR_RANGE_LIST(midr_list) \ 551 .type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM, \ 552 CAP_MIDR_RANGE_LIST(midr_list) 553 554 /* Track overall mitigation state. We are only mitigated if all cores are ok */ 555 static bool __hardenbp_enab = true; 556 static bool __spectrev2_safe = true; 557 558 int get_spectre_v2_workaround_state(void) 559 { 560 if (__spectrev2_safe) 561 return ARM64_BP_HARDEN_NOT_REQUIRED; 562 563 if (!__hardenbp_enab) 564 return ARM64_BP_HARDEN_UNKNOWN; 565 566 return ARM64_BP_HARDEN_WA_NEEDED; 567 } 568 569 /* 570 * List of CPUs that do not need any Spectre-v2 mitigation at all. 571 */ 572 static const struct midr_range spectre_v2_safe_list[] = { 573 MIDR_ALL_VERSIONS(MIDR_CORTEX_A35), 574 MIDR_ALL_VERSIONS(MIDR_CORTEX_A53), 575 MIDR_ALL_VERSIONS(MIDR_CORTEX_A55), 576 { /* sentinel */ } 577 }; 578 579 /* 580 * Track overall bp hardening for all heterogeneous cores in the machine. 581 * We are only considered "safe" if all booted cores are known safe. 582 */ 583 static bool __maybe_unused 584 check_branch_predictor(const struct arm64_cpu_capabilities *entry, int scope) 585 { 586 int need_wa; 587 588 WARN_ON(scope != SCOPE_LOCAL_CPU || preemptible()); 589 590 /* If the CPU has CSV2 set, we're safe */ 591 if (cpuid_feature_extract_unsigned_field(read_cpuid(ID_AA64PFR0_EL1), 592 ID_AA64PFR0_CSV2_SHIFT)) 593 return false; 594 595 /* Alternatively, we have a list of unaffected CPUs */ 596 if (is_midr_in_range_list(read_cpuid_id(), spectre_v2_safe_list)) 597 return false; 598 599 /* Fallback to firmware detection */ 600 need_wa = detect_harden_bp_fw(); 601 if (!need_wa) 602 return false; 603 604 __spectrev2_safe = false; 605 606 if (!IS_ENABLED(CONFIG_HARDEN_BRANCH_PREDICTOR)) { 607 pr_warn_once("spectrev2 mitigation disabled by kernel configuration\n"); 608 __hardenbp_enab = false; 609 return false; 610 } 611 612 /* forced off */ 613 if (__nospectre_v2 || cpu_mitigations_off()) { 614 pr_info_once("spectrev2 mitigation disabled by command line option\n"); 615 __hardenbp_enab = false; 616 return false; 617 } 618 619 if (need_wa < 0) { 620 pr_warn_once("ARM_SMCCC_ARCH_WORKAROUND_1 missing from firmware\n"); 621 __hardenbp_enab = false; 622 } 623 624 return (need_wa > 0); 625 } 626 627 static const __maybe_unused struct midr_range tx2_family_cpus[] = { 628 MIDR_ALL_VERSIONS(MIDR_BRCM_VULCAN), 629 MIDR_ALL_VERSIONS(MIDR_CAVIUM_THUNDERX2), 630 {}, 631 }; 632 633 static bool __maybe_unused 634 needs_tx2_tvm_workaround(const struct arm64_cpu_capabilities *entry, 635 int scope) 636 { 637 int i; 638 639 if (!is_affected_midr_range_list(entry, scope) || 640 !is_hyp_mode_available()) 641 return false; 642 643 for_each_possible_cpu(i) { 644 if (MPIDR_AFFINITY_LEVEL(cpu_logical_map(i), 0) != 0) 645 return true; 646 } 647 648 return false; 649 } 650 651 #ifdef CONFIG_HARDEN_EL2_VECTORS 652 653 static const struct midr_range arm64_harden_el2_vectors[] = { 654 MIDR_ALL_VERSIONS(MIDR_CORTEX_A57), 655 MIDR_ALL_VERSIONS(MIDR_CORTEX_A72), 656 {}, 657 }; 658 659 #endif 660 661 #ifdef CONFIG_ARM64_WORKAROUND_REPEAT_TLBI 662 663 static const struct midr_range arm64_repeat_tlbi_cpus[] = { 664 #ifdef CONFIG_QCOM_FALKOR_ERRATUM_1009 665 MIDR_RANGE(MIDR_QCOM_FALKOR_V1, 0, 0, 0, 0), 666 #endif 667 #ifdef CONFIG_ARM64_ERRATUM_1286807 668 MIDR_RANGE(MIDR_CORTEX_A76, 0, 0, 3, 0), 669 #endif 670 {}, 671 }; 672 673 #endif 674 675 #ifdef CONFIG_CAVIUM_ERRATUM_27456 676 const struct midr_range cavium_erratum_27456_cpus[] = { 677 /* Cavium ThunderX, T88 pass 1.x - 2.1 */ 678 MIDR_RANGE(MIDR_THUNDERX, 0, 0, 1, 1), 679 /* Cavium ThunderX, T81 pass 1.0 */ 680 MIDR_REV(MIDR_THUNDERX_81XX, 0, 0), 681 {}, 682 }; 683 #endif 684 685 #ifdef CONFIG_CAVIUM_ERRATUM_30115 686 static const struct midr_range cavium_erratum_30115_cpus[] = { 687 /* Cavium ThunderX, T88 pass 1.x - 2.2 */ 688 MIDR_RANGE(MIDR_THUNDERX, 0, 0, 1, 2), 689 /* Cavium ThunderX, T81 pass 1.0 - 1.2 */ 690 MIDR_REV_RANGE(MIDR_THUNDERX_81XX, 0, 0, 2), 691 /* Cavium ThunderX, T83 pass 1.0 */ 692 MIDR_REV(MIDR_THUNDERX_83XX, 0, 0), 693 {}, 694 }; 695 #endif 696 697 #ifdef CONFIG_QCOM_FALKOR_ERRATUM_1003 698 static const struct arm64_cpu_capabilities qcom_erratum_1003_list[] = { 699 { 700 ERRATA_MIDR_REV(MIDR_QCOM_FALKOR_V1, 0, 0), 701 }, 702 { 703 .midr_range.model = MIDR_QCOM_KRYO, 704 .matches = is_kryo_midr, 705 }, 706 {}, 707 }; 708 #endif 709 710 #ifdef CONFIG_ARM64_WORKAROUND_CLEAN_CACHE 711 static const struct midr_range workaround_clean_cache[] = { 712 #if defined(CONFIG_ARM64_ERRATUM_826319) || \ 713 defined(CONFIG_ARM64_ERRATUM_827319) || \ 714 defined(CONFIG_ARM64_ERRATUM_824069) 715 /* Cortex-A53 r0p[012]: ARM errata 826319, 827319, 824069 */ 716 MIDR_REV_RANGE(MIDR_CORTEX_A53, 0, 0, 2), 717 #endif 718 #ifdef CONFIG_ARM64_ERRATUM_819472 719 /* Cortex-A53 r0p[01] : ARM errata 819472 */ 720 MIDR_REV_RANGE(MIDR_CORTEX_A53, 0, 0, 1), 721 #endif 722 {}, 723 }; 724 #endif 725 726 #ifdef CONFIG_ARM64_ERRATUM_1418040 727 /* 728 * - 1188873 affects r0p0 to r2p0 729 * - 1418040 affects r0p0 to r3p1 730 */ 731 static const struct midr_range erratum_1418040_list[] = { 732 /* Cortex-A76 r0p0 to r3p1 */ 733 MIDR_RANGE(MIDR_CORTEX_A76, 0, 0, 3, 1), 734 /* Neoverse-N1 r0p0 to r3p1 */ 735 MIDR_RANGE(MIDR_NEOVERSE_N1, 0, 0, 3, 1), 736 {}, 737 }; 738 #endif 739 740 const struct arm64_cpu_capabilities arm64_errata[] = { 741 #ifdef CONFIG_ARM64_WORKAROUND_CLEAN_CACHE 742 { 743 .desc = "ARM errata 826319, 827319, 824069, 819472", 744 .capability = ARM64_WORKAROUND_CLEAN_CACHE, 745 ERRATA_MIDR_RANGE_LIST(workaround_clean_cache), 746 .cpu_enable = cpu_enable_cache_maint_trap, 747 }, 748 #endif 749 #ifdef CONFIG_ARM64_ERRATUM_832075 750 { 751 /* Cortex-A57 r0p0 - r1p2 */ 752 .desc = "ARM erratum 832075", 753 .capability = ARM64_WORKAROUND_DEVICE_LOAD_ACQUIRE, 754 ERRATA_MIDR_RANGE(MIDR_CORTEX_A57, 755 0, 0, 756 1, 2), 757 }, 758 #endif 759 #ifdef CONFIG_ARM64_ERRATUM_834220 760 { 761 /* Cortex-A57 r0p0 - r1p2 */ 762 .desc = "ARM erratum 834220", 763 .capability = ARM64_WORKAROUND_834220, 764 ERRATA_MIDR_RANGE(MIDR_CORTEX_A57, 765 0, 0, 766 1, 2), 767 }, 768 #endif 769 #ifdef CONFIG_ARM64_ERRATUM_843419 770 { 771 /* Cortex-A53 r0p[01234] */ 772 .desc = "ARM erratum 843419", 773 .capability = ARM64_WORKAROUND_843419, 774 ERRATA_MIDR_REV_RANGE(MIDR_CORTEX_A53, 0, 0, 4), 775 MIDR_FIXED(0x4, BIT(8)), 776 }, 777 #endif 778 #ifdef CONFIG_ARM64_ERRATUM_845719 779 { 780 /* Cortex-A53 r0p[01234] */ 781 .desc = "ARM erratum 845719", 782 .capability = ARM64_WORKAROUND_845719, 783 ERRATA_MIDR_REV_RANGE(MIDR_CORTEX_A53, 0, 0, 4), 784 }, 785 #endif 786 #ifdef CONFIG_CAVIUM_ERRATUM_23154 787 { 788 /* Cavium ThunderX, pass 1.x */ 789 .desc = "Cavium erratum 23154", 790 .capability = ARM64_WORKAROUND_CAVIUM_23154, 791 ERRATA_MIDR_REV_RANGE(MIDR_THUNDERX, 0, 0, 1), 792 }, 793 #endif 794 #ifdef CONFIG_CAVIUM_ERRATUM_27456 795 { 796 .desc = "Cavium erratum 27456", 797 .capability = ARM64_WORKAROUND_CAVIUM_27456, 798 ERRATA_MIDR_RANGE_LIST(cavium_erratum_27456_cpus), 799 }, 800 #endif 801 #ifdef CONFIG_CAVIUM_ERRATUM_30115 802 { 803 .desc = "Cavium erratum 30115", 804 .capability = ARM64_WORKAROUND_CAVIUM_30115, 805 ERRATA_MIDR_RANGE_LIST(cavium_erratum_30115_cpus), 806 }, 807 #endif 808 { 809 .desc = "Mismatched cache type (CTR_EL0)", 810 .capability = ARM64_MISMATCHED_CACHE_TYPE, 811 .matches = has_mismatched_cache_type, 812 .type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM, 813 .cpu_enable = cpu_enable_trap_ctr_access, 814 }, 815 #ifdef CONFIG_QCOM_FALKOR_ERRATUM_1003 816 { 817 .desc = "Qualcomm Technologies Falkor/Kryo erratum 1003", 818 .capability = ARM64_WORKAROUND_QCOM_FALKOR_E1003, 819 .matches = cpucap_multi_entry_cap_matches, 820 .match_list = qcom_erratum_1003_list, 821 }, 822 #endif 823 #ifdef CONFIG_ARM64_WORKAROUND_REPEAT_TLBI 824 { 825 .desc = "Qualcomm erratum 1009, ARM erratum 1286807", 826 .capability = ARM64_WORKAROUND_REPEAT_TLBI, 827 ERRATA_MIDR_RANGE_LIST(arm64_repeat_tlbi_cpus), 828 }, 829 #endif 830 #ifdef CONFIG_ARM64_ERRATUM_858921 831 { 832 /* Cortex-A73 all versions */ 833 .desc = "ARM erratum 858921", 834 .capability = ARM64_WORKAROUND_858921, 835 ERRATA_MIDR_ALL_VERSIONS(MIDR_CORTEX_A73), 836 }, 837 #endif 838 { 839 .capability = ARM64_HARDEN_BRANCH_PREDICTOR, 840 .type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM, 841 .matches = check_branch_predictor, 842 }, 843 #ifdef CONFIG_HARDEN_EL2_VECTORS 844 { 845 .desc = "EL2 vector hardening", 846 .capability = ARM64_HARDEN_EL2_VECTORS, 847 ERRATA_MIDR_RANGE_LIST(arm64_harden_el2_vectors), 848 }, 849 #endif 850 { 851 .desc = "Speculative Store Bypass Disable", 852 .capability = ARM64_SSBD, 853 .type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM, 854 .matches = has_ssbd_mitigation, 855 .midr_range_list = arm64_ssb_cpus, 856 }, 857 #ifdef CONFIG_ARM64_ERRATUM_1418040 858 { 859 .desc = "ARM erratum 1418040", 860 .capability = ARM64_WORKAROUND_1418040, 861 ERRATA_MIDR_RANGE_LIST(erratum_1418040_list), 862 }, 863 #endif 864 #ifdef CONFIG_ARM64_ERRATUM_1165522 865 { 866 /* Cortex-A76 r0p0 to r2p0 */ 867 .desc = "ARM erratum 1165522", 868 .capability = ARM64_WORKAROUND_1165522, 869 ERRATA_MIDR_RANGE(MIDR_CORTEX_A76, 0, 0, 2, 0), 870 }, 871 #endif 872 #ifdef CONFIG_ARM64_ERRATUM_1463225 873 { 874 .desc = "ARM erratum 1463225", 875 .capability = ARM64_WORKAROUND_1463225, 876 .type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM, 877 .matches = has_cortex_a76_erratum_1463225, 878 }, 879 #endif 880 #ifdef CONFIG_CAVIUM_TX2_ERRATUM_219 881 { 882 .desc = "Cavium ThunderX2 erratum 219 (KVM guest sysreg trapping)", 883 .capability = ARM64_WORKAROUND_CAVIUM_TX2_219_TVM, 884 ERRATA_MIDR_RANGE_LIST(tx2_family_cpus), 885 .matches = needs_tx2_tvm_workaround, 886 }, 887 { 888 .desc = "Cavium ThunderX2 erratum 219 (PRFM removal)", 889 .capability = ARM64_WORKAROUND_CAVIUM_TX2_219_PRFM, 890 ERRATA_MIDR_RANGE_LIST(tx2_family_cpus), 891 }, 892 #endif 893 { 894 } 895 }; 896 897 ssize_t cpu_show_spectre_v1(struct device *dev, struct device_attribute *attr, 898 char *buf) 899 { 900 return sprintf(buf, "Mitigation: __user pointer sanitization\n"); 901 } 902 903 ssize_t cpu_show_spectre_v2(struct device *dev, struct device_attribute *attr, 904 char *buf) 905 { 906 switch (get_spectre_v2_workaround_state()) { 907 case ARM64_BP_HARDEN_NOT_REQUIRED: 908 return sprintf(buf, "Not affected\n"); 909 case ARM64_BP_HARDEN_WA_NEEDED: 910 return sprintf(buf, "Mitigation: Branch predictor hardening\n"); 911 case ARM64_BP_HARDEN_UNKNOWN: 912 default: 913 return sprintf(buf, "Vulnerable\n"); 914 } 915 } 916 917 ssize_t cpu_show_spec_store_bypass(struct device *dev, 918 struct device_attribute *attr, char *buf) 919 { 920 if (__ssb_safe) 921 return sprintf(buf, "Not affected\n"); 922 923 switch (ssbd_state) { 924 case ARM64_SSBD_KERNEL: 925 case ARM64_SSBD_FORCE_ENABLE: 926 if (IS_ENABLED(CONFIG_ARM64_SSBD)) 927 return sprintf(buf, 928 "Mitigation: Speculative Store Bypass disabled via prctl\n"); 929 } 930 931 return sprintf(buf, "Vulnerable\n"); 932 } 933