arch/arm64/kernel/cpu_errata.c

   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
  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 *__unused)
  91 {
  92         u64 mask = arm64_ftr_reg_ctrel0.strict_mask;
  93
  94         /* Trap CTR_EL0 access on this CPU, only if it has a mismatch */
  95         if ((read_cpuid_cachetype() & mask) !=
  96             (arm64_ftr_reg_ctrel0.sys_val & mask))
  97                 sysreg_clear_set(sctlr_el1, SCTLR_EL1_UCT, 0);
  98 }
  99
 100 atomic_t arm64_el2_vector_last_slot = ATOMIC_INIT(-1);
 101
 102 #include <asm/mmu_context.h>
 103 #include <asm/cacheflush.h>
 104
 105 DEFINE_PER_CPU_READ_MOSTLY(struct bp_hardening_data, bp_hardening_data);
 106
 107 #ifdef CONFIG_KVM_INDIRECT_VECTORS
 108 extern char __smccc_workaround_1_smc_start[];
 109 extern char __smccc_workaround_1_smc_end[];
 110
 111 static void __copy_hyp_vect_bpi(int slot, const char *hyp_vecs_start,
 112                                 const char *hyp_vecs_end)
 113 {
 114         void *dst = lm_alias(__bp_harden_hyp_vecs_start + slot * SZ_2K);
 115         int i;
 116
 117         for (i = 0; i < SZ_2K; i += 0x80)
 118                 memcpy(dst + i, hyp_vecs_start, hyp_vecs_end - hyp_vecs_start);
 119
 120         __flush_icache_range((uintptr_t)dst, (uintptr_t)dst + SZ_2K);
 121 }
 122
 123 static void install_bp_hardening_cb(bp_hardening_cb_t fn,
 124                                     const char *hyp_vecs_start,
 125                                     const char *hyp_vecs_end)
 126 {
 127         static DEFINE_RAW_SPINLOCK(bp_lock);
 128         int cpu, slot = -1;
 129
 130         /*
 131          * enable_smccc_arch_workaround_1() passes NULL for the hyp_vecs
 132          * start/end if we're a guest. Skip the hyp-vectors work.
 133          */
 134         if (!hyp_vecs_start) {
 135                 __this_cpu_write(bp_hardening_data.fn, fn);
 136                 return;
 137         }
 138
 139         raw_spin_lock(&bp_lock);
 140         for_each_possible_cpu(cpu) {
 141                 if (per_cpu(bp_hardening_data.fn, cpu) == fn) {
 142                         slot = per_cpu(bp_hardening_data.hyp_vectors_slot, cpu);
 143                         break;
 144                 }
 145         }
 146
 147         if (slot == -1) {
 148                 slot = atomic_inc_return(&arm64_el2_vector_last_slot);
 149                 BUG_ON(slot >= BP_HARDEN_EL2_SLOTS);
 150                 __copy_hyp_vect_bpi(slot, hyp_vecs_start, hyp_vecs_end);
 151         }
 152
 153         __this_cpu_write(bp_hardening_data.hyp_vectors_slot, slot);
 154         __this_cpu_write(bp_hardening_data.fn, fn);
 155         raw_spin_unlock(&bp_lock);
 156 }
 157 #else
 158 #define __smccc_workaround_1_smc_start          NULL
 159 #define __smccc_workaround_1_smc_end            NULL
 160
 161 static void install_bp_hardening_cb(bp_hardening_cb_t fn,
 162                                       const char *hyp_vecs_start,
 163                                       const char *hyp_vecs_end)
 164 {
 165         __this_cpu_write(bp_hardening_data.fn, fn);
 166 }
 167 #endif  /* CONFIG_KVM_INDIRECT_VECTORS */
 168
 169 #include <uapi/linux/psci.h>
 170 #include <linux/arm-smccc.h>
 171 #include <linux/psci.h>
 172
 173 static void call_smc_arch_workaround_1(void)
 174 {
 175         arm_smccc_1_1_smc(ARM_SMCCC_ARCH_WORKAROUND_1, NULL);
 176 }
 177
 178 static void call_hvc_arch_workaround_1(void)
 179 {
 180         arm_smccc_1_1_hvc(ARM_SMCCC_ARCH_WORKAROUND_1, NULL);
 181 }
 182
 183 static void qcom_link_stack_sanitization(void)
 184 {
 185         u64 tmp;
 186
 187         asm volatile("mov       %0, x30         \n"
 188                      ".rept     16              \n"
 189                      "bl        . + 4           \n"
 190                      ".endr                     \n"
 191                      "mov       x30, %0         \n"
 192                      : "=&r" (tmp));
 193 }
 194
 195 static bool __nospectre_v2;
 196 static int __init parse_nospectre_v2(char *str)
 197 {
 198         __nospectre_v2 = true;
 199         return 0;
 200 }
 201 early_param("nospectre_v2", parse_nospectre_v2);
 202
 203 /*
 204  * -1: No workaround
 205  *  0: No workaround required
 206  *  1: Workaround installed
 207  */
 208 static int detect_harden_bp_fw(void)
 209 {
 210         bp_hardening_cb_t cb;
 211         void *smccc_start, *smccc_end;
 212         struct arm_smccc_res res;
 213         u32 midr = read_cpuid_id();
 214
 215         if (psci_ops.smccc_version == SMCCC_VERSION_1_0)
 216                 return -1;
 217
 218         switch (psci_ops.conduit) {
 219         case PSCI_CONDUIT_HVC:
 220                 arm_smccc_1_1_hvc(ARM_SMCCC_ARCH_FEATURES_FUNC_ID,
 221                                   ARM_SMCCC_ARCH_WORKAROUND_1, &res);
 222                 switch ((int)res.a0) {
 223                 case 1:
 224                         /* Firmware says we're just fine */
 225                         return 0;
 226                 case 0:
 227                         cb = call_hvc_arch_workaround_1;
 228                         /* This is a guest, no need to patch KVM vectors */
 229                         smccc_start = NULL;
 230                         smccc_end = NULL;
 231                         break;
 232                 default:
 233                         return -1;
 234                 }
 235                 break;
 236
 237         case PSCI_CONDUIT_SMC:
 238                 arm_smccc_1_1_smc(ARM_SMCCC_ARCH_FEATURES_FUNC_ID,
 239                                   ARM_SMCCC_ARCH_WORKAROUND_1, &res);
 240                 switch ((int)res.a0) {
 241                 case 1:
 242                         /* Firmware says we're just fine */
 243                         return 0;
 244                 case 0:
 245                         cb = call_smc_arch_workaround_1;
 246                         smccc_start = __smccc_workaround_1_smc_start;
 247                         smccc_end = __smccc_workaround_1_smc_end;
 248                         break;
 249                 default:
 250                         return -1;
 251                 }
 252                 break;
 253
 254         default:
 255                 return -1;
 256         }
 257
 258         if (((midr & MIDR_CPU_MODEL_MASK) == MIDR_QCOM_FALKOR) ||
 259             ((midr & MIDR_CPU_MODEL_MASK) == MIDR_QCOM_FALKOR_V1))
 260                 cb = qcom_link_stack_sanitization;
 261
 262         if (IS_ENABLED(CONFIG_HARDEN_BRANCH_PREDICTOR))
 263                 install_bp_hardening_cb(cb, smccc_start, smccc_end);
 264
 265         return 1;
 266 }
 267
 268 DEFINE_PER_CPU_READ_MOSTLY(u64, arm64_ssbd_callback_required);
 269
 270 int ssbd_state __read_mostly = ARM64_SSBD_KERNEL;
 271 static bool __ssb_safe = true;
 272
 273 static const struct ssbd_options {
 274         const char      *str;
 275         int             state;
 276 } ssbd_options[] = {
 277         { "force-on",   ARM64_SSBD_FORCE_ENABLE, },
 278         { "force-off",  ARM64_SSBD_FORCE_DISABLE, },
 279         { "kernel",     ARM64_SSBD_KERNEL, },
 280 };
 281
 282 static int __init ssbd_cfg(char *buf)
 283 {
 284         int i;
 285
 286         if (!buf || !buf[0])
 287                 return -EINVAL;
 288
 289         for (i = 0; i < ARRAY_SIZE(ssbd_options); i++) {
 290                 int len = strlen(ssbd_options[i].str);
 291
 292                 if (strncmp(buf, ssbd_options[i].str, len))
 293                         continue;
 294
 295                 ssbd_state = ssbd_options[i].state;
 296                 return 0;
 297         }
 298
 299         return -EINVAL;
 300 }
 301 early_param("ssbd", ssbd_cfg);
 302
 303 void __init arm64_update_smccc_conduit(struct alt_instr *alt,
 304                                        __le32 *origptr, __le32 *updptr,
 305                                        int nr_inst)
 306 {
 307         u32 insn;
 308
 309         BUG_ON(nr_inst != 1);
 310
 311         switch (psci_ops.conduit) {
 312         case PSCI_CONDUIT_HVC:
 313                 insn = aarch64_insn_get_hvc_value();
 314                 break;
 315         case PSCI_CONDUIT_SMC:
 316                 insn = aarch64_insn_get_smc_value();
 317                 break;
 318         default:
 319                 return;
 320         }
 321
 322         *updptr = cpu_to_le32(insn);
 323 }
 324
 325 void __init arm64_enable_wa2_handling(struct alt_instr *alt,
 326                                       __le32 *origptr, __le32 *updptr,
 327                                       int nr_inst)
 328 {
 329         BUG_ON(nr_inst != 1);
 330         /*
 331          * Only allow mitigation on EL1 entry/exit and guest
 332          * ARCH_WORKAROUND_2 handling if the SSBD state allows it to
 333          * be flipped.
 334          */
 335         if (arm64_get_ssbd_state() == ARM64_SSBD_KERNEL)
 336                 *updptr = cpu_to_le32(aarch64_insn_gen_nop());
 337 }
 338
 339 void arm64_set_ssbd_mitigation(bool state)
 340 {
 341         if (!IS_ENABLED(CONFIG_ARM64_SSBD)) {
 342                 pr_info_once("SSBD disabled by kernel configuration\n");
 343                 return;
 344         }
 345
 346         if (this_cpu_has_cap(ARM64_SSBS)) {
 347                 if (state)
 348                         asm volatile(SET_PSTATE_SSBS(0));
 349                 else
 350                         asm volatile(SET_PSTATE_SSBS(1));
 351                 return;
 352         }
 353
 354         switch (psci_ops.conduit) {
 355         case PSCI_CONDUIT_HVC:
 356                 arm_smccc_1_1_hvc(ARM_SMCCC_ARCH_WORKAROUND_2, state, NULL);
 357                 break;
 358
 359         case PSCI_CONDUIT_SMC:
 360                 arm_smccc_1_1_smc(ARM_SMCCC_ARCH_WORKAROUND_2, state, NULL);
 361                 break;
 362
 363         default:
 364                 WARN_ON_ONCE(1);
 365                 break;
 366         }
 367 }
 368
 369 static bool has_ssbd_mitigation(const struct arm64_cpu_capabilities *entry,
 370                                     int scope)
 371 {
 372         struct arm_smccc_res res;
 373         bool required = true;
 374         s32 val;
 375         bool this_cpu_safe = false;
 376
 377         WARN_ON(scope != SCOPE_LOCAL_CPU || preemptible());
 378
 379         if (cpu_mitigations_off())
 380                 ssbd_state = ARM64_SSBD_FORCE_DISABLE;
 381
 382         /* delay setting __ssb_safe until we get a firmware response */
 383         if (is_midr_in_range_list(read_cpuid_id(), entry->midr_range_list))
 384                 this_cpu_safe = true;
 385
 386         if (this_cpu_has_cap(ARM64_SSBS)) {
 387                 if (!this_cpu_safe)
 388                         __ssb_safe = false;
 389                 required = false;
 390                 goto out_printmsg;
 391         }
 392
 393         if (psci_ops.smccc_version == SMCCC_VERSION_1_0) {
 394                 ssbd_state = ARM64_SSBD_UNKNOWN;
 395                 if (!this_cpu_safe)
 396                         __ssb_safe = false;
 397                 return false;
 398         }
 399
 400         switch (psci_ops.conduit) {
 401         case PSCI_CONDUIT_HVC:
 402                 arm_smccc_1_1_hvc(ARM_SMCCC_ARCH_FEATURES_FUNC_ID,
 403                                   ARM_SMCCC_ARCH_WORKAROUND_2, &res);
 404                 break;
 405
 406         case PSCI_CONDUIT_SMC:
 407                 arm_smccc_1_1_smc(ARM_SMCCC_ARCH_FEATURES_FUNC_ID,
 408                                   ARM_SMCCC_ARCH_WORKAROUND_2, &res);
 409                 break;
 410
 411         default:
 412                 ssbd_state = ARM64_SSBD_UNKNOWN;
 413                 if (!this_cpu_safe)
 414                         __ssb_safe = false;
 415                 return false;
 416         }
 417
 418         val = (s32)res.a0;
 419
 420         switch (val) {
 421         case SMCCC_RET_NOT_SUPPORTED:
 422                 ssbd_state = ARM64_SSBD_UNKNOWN;
 423                 if (!this_cpu_safe)
 424                         __ssb_safe = false;
 425                 return false;
 426
 427         /* machines with mixed mitigation requirements must not return this */
 428         case SMCCC_RET_NOT_REQUIRED:
 429                 pr_info_once("%s mitigation not required\n", entry->desc);
 430                 ssbd_state = ARM64_SSBD_MITIGATED;
 431                 return false;
 432
 433         case SMCCC_RET_SUCCESS:
 434                 __ssb_safe = false;
 435                 required = true;
 436                 break;
 437
 438         case 1: /* Mitigation not required on this CPU */
 439                 required = false;
 440                 break;
 441
 442         default:
 443                 WARN_ON(1);
 444                 if (!this_cpu_safe)
 445                         __ssb_safe = false;
 446                 return false;
 447         }
 448
 449         switch (ssbd_state) {
 450         case ARM64_SSBD_FORCE_DISABLE:
 451                 arm64_set_ssbd_mitigation(false);
 452                 required = false;
 453                 break;
 454
 455         case ARM64_SSBD_KERNEL:
 456                 if (required) {
 457                         __this_cpu_write(arm64_ssbd_callback_required, 1);
 458                         arm64_set_ssbd_mitigation(true);
 459                 }
 460                 break;
 461
 462         case ARM64_SSBD_FORCE_ENABLE:
 463                 arm64_set_ssbd_mitigation(true);
 464                 required = true;
 465                 break;
 466
 467         default:
 468                 WARN_ON(1);
 469                 break;
 470         }
 471
 472 out_printmsg:
 473         switch (ssbd_state) {
 474         case ARM64_SSBD_FORCE_DISABLE:
 475                 pr_info_once("%s disabled from command-line\n", entry->desc);
 476                 break;
 477
 478         case ARM64_SSBD_FORCE_ENABLE:
 479                 pr_info_once("%s forced from command-line\n", entry->desc);
 480                 break;
 481         }
 482
 483         return required;
 484 }
 485
 486 /* known invulnerable cores */
 487 static const struct midr_range arm64_ssb_cpus[] = {
 488         MIDR_ALL_VERSIONS(MIDR_CORTEX_A35),
 489         MIDR_ALL_VERSIONS(MIDR_CORTEX_A53),
 490         MIDR_ALL_VERSIONS(MIDR_CORTEX_A55),
 491         {},
 492 };
 493
 494 #ifdef CONFIG_ARM64_ERRATUM_1463225
 495 DEFINE_PER_CPU(int, __in_cortex_a76_erratum_1463225_wa);
 496
 497 static bool
 498 has_cortex_a76_erratum_1463225(const struct arm64_cpu_capabilities *entry,
 499                                int scope)
 500 {
 501         u32 midr = read_cpuid_id();
 502         /* Cortex-A76 r0p0 - r3p1 */
 503         struct midr_range range = MIDR_RANGE(MIDR_CORTEX_A76, 0, 0, 3, 1);
 504
 505         WARN_ON(scope != SCOPE_LOCAL_CPU || preemptible());
 506         return is_midr_in_range(midr, &range) && is_kernel_in_hyp_mode();
 507 }
 508 #endif
 509
 510 static void __maybe_unused
 511 cpu_enable_cache_maint_trap(const struct arm64_cpu_capabilities *__unused)
 512 {
 513         sysreg_clear_set(sctlr_el1, SCTLR_EL1_UCI, 0);
 514 }
 515
 516 #define CAP_MIDR_RANGE(model, v_min, r_min, v_max, r_max)       \
 517         .matches = is_affected_midr_range,                      \
 518         .midr_range = MIDR_RANGE(model, v_min, r_min, v_max, r_max)
 519
 520 #define CAP_MIDR_ALL_VERSIONS(model)                                    \
 521         .matches = is_affected_midr_range,                              \
 522         .midr_range = MIDR_ALL_VERSIONS(model)
 523
 524 #define MIDR_FIXED(rev, revidr_mask) \
 525         .fixed_revs = (struct arm64_midr_revidr[]){{ (rev), (revidr_mask) }, {}}
 526
 527 #define ERRATA_MIDR_RANGE(model, v_min, r_min, v_max, r_max)            \
 528         .type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM,                         \
 529         CAP_MIDR_RANGE(model, v_min, r_min, v_max, r_max)
 530
 531 #define CAP_MIDR_RANGE_LIST(list)                               \
 532         .matches = is_affected_midr_range_list,                 \
 533         .midr_range_list = list
 534
 535 /* Errata affecting a range of revisions of  given model variant */
 536 #define ERRATA_MIDR_REV_RANGE(m, var, r_min, r_max)      \
 537         ERRATA_MIDR_RANGE(m, var, r_min, var, r_max)
 538
 539 /* Errata affecting a single variant/revision of a model */
 540 #define ERRATA_MIDR_REV(model, var, rev)        \
 541         ERRATA_MIDR_RANGE(model, var, rev, var, rev)
 542
 543 /* Errata affecting all variants/revisions of a given a model */
 544 #define ERRATA_MIDR_ALL_VERSIONS(model)                         \
 545         .type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM,                 \
 546         CAP_MIDR_ALL_VERSIONS(model)
 547
 548 /* Errata affecting a list of midr ranges, with same work around */
 549 #define ERRATA_MIDR_RANGE_LIST(midr_list)                       \
 550         .type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM,                 \
 551         CAP_MIDR_RANGE_LIST(midr_list)
 552
 553 /* Track overall mitigation state. We are only mitigated if all cores are ok */
 554 static bool __hardenbp_enab = true;
 555 static bool __spectrev2_safe = true;
 556
 557 int get_spectre_v2_workaround_state(void)
 558 {
 559         if (__spectrev2_safe)
 560                 return ARM64_BP_HARDEN_NOT_REQUIRED;
 561
 562         if (!__hardenbp_enab)
 563                 return ARM64_BP_HARDEN_UNKNOWN;
 564
 565         return ARM64_BP_HARDEN_WA_NEEDED;
 566 }
 567
 568 /*
 569  * List of CPUs that do not need any Spectre-v2 mitigation at all.
 570  */
 571 static const struct midr_range spectre_v2_safe_list[] = {
 572         MIDR_ALL_VERSIONS(MIDR_CORTEX_A35),
 573         MIDR_ALL_VERSIONS(MIDR_CORTEX_A53),
 574         MIDR_ALL_VERSIONS(MIDR_CORTEX_A55),
 575         { /* sentinel */ }
 576 };
 577
 578 /*
 579  * Track overall bp hardening for all heterogeneous cores in the machine.
 580  * We are only considered "safe" if all booted cores are known safe.
 581  */
 582 static bool __maybe_unused
 583 check_branch_predictor(const struct arm64_cpu_capabilities *entry, int scope)
 584 {
 585         int need_wa;
 586
 587         WARN_ON(scope != SCOPE_LOCAL_CPU || preemptible());
 588
 589         /* If the CPU has CSV2 set, we're safe */
 590         if (cpuid_feature_extract_unsigned_field(read_cpuid(ID_AA64PFR0_EL1),
 591                                                  ID_AA64PFR0_CSV2_SHIFT))
 592                 return false;
 593
 594         /* Alternatively, we have a list of unaffected CPUs */
 595         if (is_midr_in_range_list(read_cpuid_id(), spectre_v2_safe_list))
 596                 return false;
 597
 598         /* Fallback to firmware detection */
 599         need_wa = detect_harden_bp_fw();
 600         if (!need_wa)
 601                 return false;
 602
 603         __spectrev2_safe = false;
 604
 605         if (!IS_ENABLED(CONFIG_HARDEN_BRANCH_PREDICTOR)) {
 606                 pr_warn_once("spectrev2 mitigation disabled by kernel configuration\n");
 607                 __hardenbp_enab = false;
 608                 return false;
 609         }
 610
 611         /* forced off */
 612         if (__nospectre_v2 || cpu_mitigations_off()) {
 613                 pr_info_once("spectrev2 mitigation disabled by command line option\n");
 614                 __hardenbp_enab = false;
 615                 return false;
 616         }
 617
 618         if (need_wa < 0) {
 619                 pr_warn_once("ARM_SMCCC_ARCH_WORKAROUND_1 missing from firmware\n");
 620                 __hardenbp_enab = false;
 621         }
 622
 623         return (need_wa > 0);
 624 }
 625
 626 #ifdef CONFIG_HARDEN_EL2_VECTORS
 627
 628 static const struct midr_range arm64_harden_el2_vectors[] = {
 629         MIDR_ALL_VERSIONS(MIDR_CORTEX_A57),
 630         MIDR_ALL_VERSIONS(MIDR_CORTEX_A72),
 631         {},
 632 };
 633
 634 #endif
 635
 636 #ifdef CONFIG_ARM64_WORKAROUND_REPEAT_TLBI
 637
 638 static const struct midr_range arm64_repeat_tlbi_cpus[] = {
 639 #ifdef CONFIG_QCOM_FALKOR_ERRATUM_1009
 640         MIDR_RANGE(MIDR_QCOM_FALKOR_V1, 0, 0, 0, 0),
 641 #endif
 642 #ifdef CONFIG_ARM64_ERRATUM_1286807
 643         MIDR_RANGE(MIDR_CORTEX_A76, 0, 0, 3, 0),
 644 #endif
 645         {},
 646 };
 647
 648 #endif
 649
 650 #ifdef CONFIG_CAVIUM_ERRATUM_27456
 651 const struct midr_range cavium_erratum_27456_cpus[] = {
 652         /* Cavium ThunderX, T88 pass 1.x - 2.1 */
 653         MIDR_RANGE(MIDR_THUNDERX, 0, 0, 1, 1),
 654         /* Cavium ThunderX, T81 pass 1.0 */
 655         MIDR_REV(MIDR_THUNDERX_81XX, 0, 0),
 656         {},
 657 };
 658 #endif
 659
 660 #ifdef CONFIG_CAVIUM_ERRATUM_30115
 661 static const struct midr_range cavium_erratum_30115_cpus[] = {
 662         /* Cavium ThunderX, T88 pass 1.x - 2.2 */
 663         MIDR_RANGE(MIDR_THUNDERX, 0, 0, 1, 2),
 664         /* Cavium ThunderX, T81 pass 1.0 - 1.2 */
 665         MIDR_REV_RANGE(MIDR_THUNDERX_81XX, 0, 0, 2),
 666         /* Cavium ThunderX, T83 pass 1.0 */
 667         MIDR_REV(MIDR_THUNDERX_83XX, 0, 0),
 668         {},
 669 };
 670 #endif
 671
 672 #ifdef CONFIG_QCOM_FALKOR_ERRATUM_1003
 673 static const struct arm64_cpu_capabilities qcom_erratum_1003_list[] = {
 674         {
 675                 ERRATA_MIDR_REV(MIDR_QCOM_FALKOR_V1, 0, 0),
 676         },
 677         {
 678                 .midr_range.model = MIDR_QCOM_KRYO,
 679                 .matches = is_kryo_midr,
 680         },
 681         {},
 682 };
 683 #endif
 684
 685 #ifdef CONFIG_ARM64_WORKAROUND_CLEAN_CACHE
 686 static const struct midr_range workaround_clean_cache[] = {
 687 #if     defined(CONFIG_ARM64_ERRATUM_826319) || \
 688         defined(CONFIG_ARM64_ERRATUM_827319) || \
 689         defined(CONFIG_ARM64_ERRATUM_824069)
 690         /* Cortex-A53 r0p[012]: ARM errata 826319, 827319, 824069 */
 691         MIDR_REV_RANGE(MIDR_CORTEX_A53, 0, 0, 2),
 692 #endif
 693 #ifdef  CONFIG_ARM64_ERRATUM_819472
 694         /* Cortex-A53 r0p[01] : ARM errata 819472 */
 695         MIDR_REV_RANGE(MIDR_CORTEX_A53, 0, 0, 1),
 696 #endif
 697         {},
 698 };
 699 #endif
 700
 701 #ifdef CONFIG_ARM64_ERRATUM_1418040
 702 /*
 703  * - 1188873 affects r0p0 to r2p0
 704  * - 1418040 affects r0p0 to r3p1
 705  */
 706 static const struct midr_range erratum_1418040_list[] = {
 707         /* Cortex-A76 r0p0 to r3p1 */
 708         MIDR_RANGE(MIDR_CORTEX_A76, 0, 0, 3, 1),
 709         /* Neoverse-N1 r0p0 to r3p1 */
 710         MIDR_RANGE(MIDR_NEOVERSE_N1, 0, 0, 3, 1),
 711         {},
 712 };
 713 #endif
 714
 715 const struct arm64_cpu_capabilities arm64_errata[] = {
 716 #ifdef CONFIG_ARM64_WORKAROUND_CLEAN_CACHE
 717         {
 718                 .desc = "ARM errata 826319, 827319, 824069, 819472",
 719                 .capability = ARM64_WORKAROUND_CLEAN_CACHE,
 720                 ERRATA_MIDR_RANGE_LIST(workaround_clean_cache),
 721                 .cpu_enable = cpu_enable_cache_maint_trap,
 722         },
 723 #endif
 724 #ifdef CONFIG_ARM64_ERRATUM_832075
 725         {
 726         /* Cortex-A57 r0p0 - r1p2 */
 727                 .desc = "ARM erratum 832075",
 728                 .capability = ARM64_WORKAROUND_DEVICE_LOAD_ACQUIRE,
 729                 ERRATA_MIDR_RANGE(MIDR_CORTEX_A57,
 730                                   0, 0,
 731                                   1, 2),
 732         },
 733 #endif
 734 #ifdef CONFIG_ARM64_ERRATUM_834220
 735         {
 736         /* Cortex-A57 r0p0 - r1p2 */
 737                 .desc = "ARM erratum 834220",
 738                 .capability = ARM64_WORKAROUND_834220,
 739                 ERRATA_MIDR_RANGE(MIDR_CORTEX_A57,
 740                                   0, 0,
 741                                   1, 2),
 742         },
 743 #endif
 744 #ifdef CONFIG_ARM64_ERRATUM_843419
 745         {
 746         /* Cortex-A53 r0p[01234] */
 747                 .desc = "ARM erratum 843419",
 748                 .capability = ARM64_WORKAROUND_843419,
 749                 ERRATA_MIDR_REV_RANGE(MIDR_CORTEX_A53, 0, 0, 4),
 750                 MIDR_FIXED(0x4, BIT(8)),
 751         },
 752 #endif
 753 #ifdef CONFIG_ARM64_ERRATUM_845719
 754         {
 755         /* Cortex-A53 r0p[01234] */
 756                 .desc = "ARM erratum 845719",
 757                 .capability = ARM64_WORKAROUND_845719,
 758                 ERRATA_MIDR_REV_RANGE(MIDR_CORTEX_A53, 0, 0, 4),
 759         },
 760 #endif
 761 #ifdef CONFIG_CAVIUM_ERRATUM_23154
 762         {
 763         /* Cavium ThunderX, pass 1.x */
 764                 .desc = "Cavium erratum 23154",
 765                 .capability = ARM64_WORKAROUND_CAVIUM_23154,
 766                 ERRATA_MIDR_REV_RANGE(MIDR_THUNDERX, 0, 0, 1),
 767         },
 768 #endif
 769 #ifdef CONFIG_CAVIUM_ERRATUM_27456
 770         {
 771                 .desc = "Cavium erratum 27456",
 772                 .capability = ARM64_WORKAROUND_CAVIUM_27456,
 773                 ERRATA_MIDR_RANGE_LIST(cavium_erratum_27456_cpus),
 774         },
 775 #endif
 776 #ifdef CONFIG_CAVIUM_ERRATUM_30115
 777         {
 778                 .desc = "Cavium erratum 30115",
 779                 .capability = ARM64_WORKAROUND_CAVIUM_30115,
 780                 ERRATA_MIDR_RANGE_LIST(cavium_erratum_30115_cpus),
 781         },
 782 #endif
 783         {
 784                 .desc = "Mismatched cache type (CTR_EL0)",
 785                 .capability = ARM64_MISMATCHED_CACHE_TYPE,
 786                 .matches = has_mismatched_cache_type,
 787                 .type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM,
 788                 .cpu_enable = cpu_enable_trap_ctr_access,
 789         },
 790 #ifdef CONFIG_QCOM_FALKOR_ERRATUM_1003
 791         {
 792                 .desc = "Qualcomm Technologies Falkor/Kryo erratum 1003",
 793                 .capability = ARM64_WORKAROUND_QCOM_FALKOR_E1003,
 794                 .matches = cpucap_multi_entry_cap_matches,
 795                 .match_list = qcom_erratum_1003_list,
 796         },
 797 #endif
 798 #ifdef CONFIG_ARM64_WORKAROUND_REPEAT_TLBI
 799         {
 800                 .desc = "Qualcomm erratum 1009, ARM erratum 1286807",
 801                 .capability = ARM64_WORKAROUND_REPEAT_TLBI,
 802                 ERRATA_MIDR_RANGE_LIST(arm64_repeat_tlbi_cpus),
 803         },
 804 #endif
 805 #ifdef CONFIG_ARM64_ERRATUM_858921
 806         {
 807         /* Cortex-A73 all versions */
 808                 .desc = "ARM erratum 858921",
 809                 .capability = ARM64_WORKAROUND_858921,
 810                 ERRATA_MIDR_ALL_VERSIONS(MIDR_CORTEX_A73),
 811         },
 812 #endif
 813         {
 814                 .capability = ARM64_HARDEN_BRANCH_PREDICTOR,
 815                 .type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM,
 816                 .matches = check_branch_predictor,
 817         },
 818 #ifdef CONFIG_HARDEN_EL2_VECTORS
 819         {
 820                 .desc = "EL2 vector hardening",
 821                 .capability = ARM64_HARDEN_EL2_VECTORS,
 822                 ERRATA_MIDR_RANGE_LIST(arm64_harden_el2_vectors),
 823         },
 824 #endif
 825         {
 826                 .desc = "Speculative Store Bypass Disable",
 827                 .capability = ARM64_SSBD,
 828                 .type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM,
 829                 .matches = has_ssbd_mitigation,
 830                 .midr_range_list = arm64_ssb_cpus,
 831         },
 832 #ifdef CONFIG_ARM64_ERRATUM_1418040
 833         {
 834                 .desc = "ARM erratum 1418040",
 835                 .capability = ARM64_WORKAROUND_1418040,
 836                 ERRATA_MIDR_RANGE_LIST(erratum_1418040_list),
 837         },
 838 #endif
 839 #ifdef CONFIG_ARM64_ERRATUM_1165522
 840         {
 841                 /* Cortex-A76 r0p0 to r2p0 */
 842                 .desc = "ARM erratum 1165522",
 843                 .capability = ARM64_WORKAROUND_1165522,
 844                 ERRATA_MIDR_RANGE(MIDR_CORTEX_A76, 0, 0, 2, 0),
 845         },
 846 #endif
 847 #ifdef CONFIG_ARM64_ERRATUM_1463225
 848         {
 849                 .desc = "ARM erratum 1463225",
 850                 .capability = ARM64_WORKAROUND_1463225,
 851                 .type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM,
 852                 .matches = has_cortex_a76_erratum_1463225,
 853         },
 854 #endif
 855         {
 856         }
 857 };
 858
 859 ssize_t cpu_show_spectre_v1(struct device *dev, struct device_attribute *attr,
 860                             char *buf)
 861 {
 862         return sprintf(buf, "Mitigation: __user pointer sanitization\n");
 863 }
 864
 865 ssize_t cpu_show_spectre_v2(struct device *dev, struct device_attribute *attr,
 866                 char *buf)
 867 {
 868         switch (get_spectre_v2_workaround_state()) {
 869         case ARM64_BP_HARDEN_NOT_REQUIRED:
 870                 return sprintf(buf, "Not affected\n");
 871         case ARM64_BP_HARDEN_WA_NEEDED:
 872                 return sprintf(buf, "Mitigation: Branch predictor hardening\n");
 873         case ARM64_BP_HARDEN_UNKNOWN:
 874         default:
 875                 return sprintf(buf, "Vulnerable\n");
 876         }
 877 }
 878
 879 ssize_t cpu_show_spec_store_bypass(struct device *dev,
 880                 struct device_attribute *attr, char *buf)
 881 {
 882         if (__ssb_safe)
 883                 return sprintf(buf, "Not affected\n");
 884
 885         switch (ssbd_state) {
 886         case ARM64_SSBD_KERNEL:
 887         case ARM64_SSBD_FORCE_ENABLE:
 888                 if (IS_ENABLED(CONFIG_ARM64_SSBD))
 889                         return sprintf(buf,
 890                             "Mitigation: Speculative Store Bypass disabled via prctl\n");
 891         }
 892
 893         return sprintf(buf, "Vulnerable\n");
 894 }