arch/arm64/kernel/cpu_errata.c

   1 /*
   2  * Contains CPU specific errata definitions
   3  *
   4  * Copyright (C) 2014 ARM Ltd.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include <linux/types.h>
  20 #include <asm/cpu.h>
  21 #include <asm/cputype.h>
  22 #include <asm/cpufeature.h>
  23
  24 static bool __maybe_unused
  25 is_affected_midr_range(const struct arm64_cpu_capabilities *entry, int scope)
  26 {
  27         WARN_ON(scope != SCOPE_LOCAL_CPU || preemptible());
  28         return MIDR_IS_CPU_MODEL_RANGE(read_cpuid_id(), entry->midr_model,
  29                                        entry->midr_range_min,
  30                                        entry->midr_range_max);
  31 }
  32
  33 static bool __maybe_unused
  34 is_kryo_midr(const struct arm64_cpu_capabilities *entry, int scope)
  35 {
  36         u32 model;
  37
  38         WARN_ON(scope != SCOPE_LOCAL_CPU || preemptible());
  39
  40         model = read_cpuid_id();
  41         model &= MIDR_IMPLEMENTOR_MASK | (0xf00 << MIDR_PARTNUM_SHIFT) |
  42                  MIDR_ARCHITECTURE_MASK;
  43
  44         return model == entry->midr_model;
  45 }
  46
  47 static bool
  48 has_mismatched_cache_line_size(const struct arm64_cpu_capabilities *entry,
  49                                 int scope)
  50 {
  51         WARN_ON(scope != SCOPE_LOCAL_CPU || preemptible());
  52         return (read_cpuid_cachetype() & arm64_ftr_reg_ctrel0.strict_mask) !=
  53                 (arm64_ftr_reg_ctrel0.sys_val & arm64_ftr_reg_ctrel0.strict_mask);
  54 }
  55
  56 static int cpu_enable_trap_ctr_access(void *__unused)
  57 {
  58         /* Clear SCTLR_EL1.UCT */
  59         config_sctlr_el1(SCTLR_EL1_UCT, 0);
  60         return 0;
  61 }
  62
  63 #ifdef CONFIG_HARDEN_BRANCH_PREDICTOR
  64 #include <asm/mmu_context.h>
  65 #include <asm/cacheflush.h>
  66
  67 DEFINE_PER_CPU_READ_MOSTLY(struct bp_hardening_data, bp_hardening_data);
  68
  69 #ifdef CONFIG_KVM
  70 extern char __qcom_hyp_sanitize_link_stack_start[];
  71 extern char __qcom_hyp_sanitize_link_stack_end[];
  72 extern char __smccc_workaround_1_smc_start[];
  73 extern char __smccc_workaround_1_smc_end[];
  74 extern char __smccc_workaround_1_hvc_start[];
  75 extern char __smccc_workaround_1_hvc_end[];
  76
  77 static void __copy_hyp_vect_bpi(int slot, const char *hyp_vecs_start,
  78                                 const char *hyp_vecs_end)
  79 {
  80         void *dst = lm_alias(__bp_harden_hyp_vecs_start + slot * SZ_2K);
  81         int i;
  82
  83         for (i = 0; i < SZ_2K; i += 0x80)
  84                 memcpy(dst + i, hyp_vecs_start, hyp_vecs_end - hyp_vecs_start);
  85
  86         flush_icache_range((uintptr_t)dst, (uintptr_t)dst + SZ_2K);
  87 }
  88
  89 static void __install_bp_hardening_cb(bp_hardening_cb_t fn,
  90                                       const char *hyp_vecs_start,
  91                                       const char *hyp_vecs_end)
  92 {
  93         static int last_slot = -1;
  94         static DEFINE_SPINLOCK(bp_lock);
  95         int cpu, slot = -1;
  96
  97         spin_lock(&bp_lock);
  98         for_each_possible_cpu(cpu) {
  99                 if (per_cpu(bp_hardening_data.fn, cpu) == fn) {
 100                         slot = per_cpu(bp_hardening_data.hyp_vectors_slot, cpu);
 101                         break;
 102                 }
 103         }
 104
 105         if (slot == -1) {
 106                 last_slot++;
 107                 BUG_ON(((__bp_harden_hyp_vecs_end - __bp_harden_hyp_vecs_start)
 108                         / SZ_2K) <= last_slot);
 109                 slot = last_slot;
 110                 __copy_hyp_vect_bpi(slot, hyp_vecs_start, hyp_vecs_end);
 111         }
 112
 113         __this_cpu_write(bp_hardening_data.hyp_vectors_slot, slot);
 114         __this_cpu_write(bp_hardening_data.fn, fn);
 115         spin_unlock(&bp_lock);
 116 }
 117 #else
 118 #define __qcom_hyp_sanitize_link_stack_start    NULL
 119 #define __qcom_hyp_sanitize_link_stack_end      NULL
 120 #define __smccc_workaround_1_smc_start          NULL
 121 #define __smccc_workaround_1_smc_end            NULL
 122 #define __smccc_workaround_1_hvc_start          NULL
 123 #define __smccc_workaround_1_hvc_end            NULL
 124
 125 static void __install_bp_hardening_cb(bp_hardening_cb_t fn,
 126                                       const char *hyp_vecs_start,
 127                                       const char *hyp_vecs_end)
 128 {
 129         __this_cpu_write(bp_hardening_data.fn, fn);
 130 }
 131 #endif  /* CONFIG_KVM */
 132
 133 static void  install_bp_hardening_cb(const struct arm64_cpu_capabilities *entry,
 134                                      bp_hardening_cb_t fn,
 135                                      const char *hyp_vecs_start,
 136                                      const char *hyp_vecs_end)
 137 {
 138         u64 pfr0;
 139
 140         if (!entry->matches(entry, SCOPE_LOCAL_CPU))
 141                 return;
 142
 143         pfr0 = read_cpuid(ID_AA64PFR0_EL1);
 144         if (cpuid_feature_extract_unsigned_field(pfr0, ID_AA64PFR0_CSV2_SHIFT))
 145                 return;
 146
 147         __install_bp_hardening_cb(fn, hyp_vecs_start, hyp_vecs_end);
 148 }
 149
 150 #include <uapi/linux/psci.h>
 151 #include <linux/arm-smccc.h>
 152 #include <linux/psci.h>
 153
 154 static void call_smc_arch_workaround_1(void)
 155 {
 156         arm_smccc_1_1_smc(ARM_SMCCC_ARCH_WORKAROUND_1, NULL);
 157 }
 158
 159 static void call_hvc_arch_workaround_1(void)
 160 {
 161         arm_smccc_1_1_hvc(ARM_SMCCC_ARCH_WORKAROUND_1, NULL);
 162 }
 163
 164 static int enable_smccc_arch_workaround_1(void *data)
 165 {
 166         const struct arm64_cpu_capabilities *entry = data;
 167         bp_hardening_cb_t cb;
 168         void *smccc_start, *smccc_end;
 169         struct arm_smccc_res res;
 170
 171         if (!entry->matches(entry, SCOPE_LOCAL_CPU))
 172                 return 0;
 173
 174         if (psci_ops.smccc_version == SMCCC_VERSION_1_0)
 175                 return 0;
 176
 177         switch (psci_ops.conduit) {
 178         case PSCI_CONDUIT_HVC:
 179                 arm_smccc_1_1_hvc(ARM_SMCCC_ARCH_FEATURES_FUNC_ID,
 180                                   ARM_SMCCC_ARCH_WORKAROUND_1, &res);
 181                 if ((int)res.a0 < 0)
 182                         return 0;
 183                 cb = call_hvc_arch_workaround_1;
 184                 smccc_start = __smccc_workaround_1_hvc_start;
 185                 smccc_end = __smccc_workaround_1_hvc_end;
 186                 break;
 187
 188         case PSCI_CONDUIT_SMC:
 189                 arm_smccc_1_1_smc(ARM_SMCCC_ARCH_FEATURES_FUNC_ID,
 190                                   ARM_SMCCC_ARCH_WORKAROUND_1, &res);
 191                 if ((int)res.a0 < 0)
 192                         return 0;
 193                 cb = call_smc_arch_workaround_1;
 194                 smccc_start = __smccc_workaround_1_smc_start;
 195                 smccc_end = __smccc_workaround_1_smc_end;
 196                 break;
 197
 198         default:
 199                 return 0;
 200         }
 201
 202         install_bp_hardening_cb(entry, cb, smccc_start, smccc_end);
 203
 204         return 0;
 205 }
 206
 207 static void qcom_link_stack_sanitization(void)
 208 {
 209         u64 tmp;
 210
 211         asm volatile("mov       %0, x30         \n"
 212                      ".rept     16              \n"
 213                      "bl        . + 4           \n"
 214                      ".endr                     \n"
 215                      "mov       x30, %0         \n"
 216                      : "=&r" (tmp));
 217 }
 218
 219 static int qcom_enable_link_stack_sanitization(void *data)
 220 {
 221         const struct arm64_cpu_capabilities *entry = data;
 222
 223         install_bp_hardening_cb(entry, qcom_link_stack_sanitization,
 224                                 __qcom_hyp_sanitize_link_stack_start,
 225                                 __qcom_hyp_sanitize_link_stack_end);
 226
 227         return 0;
 228 }
 229 #endif  /* CONFIG_HARDEN_BRANCH_PREDICTOR */
 230
 231 #define MIDR_RANGE(model, min, max) \
 232         .def_scope = SCOPE_LOCAL_CPU, \
 233         .matches = is_affected_midr_range, \
 234         .midr_model = model, \
 235         .midr_range_min = min, \
 236         .midr_range_max = max
 237
 238 #define MIDR_ALL_VERSIONS(model) \
 239         .def_scope = SCOPE_LOCAL_CPU, \
 240         .matches = is_affected_midr_range, \
 241         .midr_model = model, \
 242         .midr_range_min = 0, \
 243         .midr_range_max = (MIDR_VARIANT_MASK | MIDR_REVISION_MASK)
 244
 245 const struct arm64_cpu_capabilities arm64_errata[] = {
 246 #if     defined(CONFIG_ARM64_ERRATUM_826319) || \
 247         defined(CONFIG_ARM64_ERRATUM_827319) || \
 248         defined(CONFIG_ARM64_ERRATUM_824069)
 249         {
 250         /* Cortex-A53 r0p[012] */
 251                 .desc = "ARM errata 826319, 827319, 824069",
 252                 .capability = ARM64_WORKAROUND_CLEAN_CACHE,
 253                 MIDR_RANGE(MIDR_CORTEX_A53, 0x00, 0x02),
 254                 .enable = cpu_enable_cache_maint_trap,
 255         },
 256 #endif
 257 #ifdef CONFIG_ARM64_ERRATUM_819472
 258         {
 259         /* Cortex-A53 r0p[01] */
 260                 .desc = "ARM errata 819472",
 261                 .capability = ARM64_WORKAROUND_CLEAN_CACHE,
 262                 MIDR_RANGE(MIDR_CORTEX_A53, 0x00, 0x01),
 263                 .enable = cpu_enable_cache_maint_trap,
 264         },
 265 #endif
 266 #ifdef CONFIG_ARM64_ERRATUM_832075
 267         {
 268         /* Cortex-A57 r0p0 - r1p2 */
 269                 .desc = "ARM erratum 832075",
 270                 .capability = ARM64_WORKAROUND_DEVICE_LOAD_ACQUIRE,
 271                 MIDR_RANGE(MIDR_CORTEX_A57,
 272                            MIDR_CPU_VAR_REV(0, 0),
 273                            MIDR_CPU_VAR_REV(1, 2)),
 274         },
 275 #endif
 276 #ifdef CONFIG_ARM64_ERRATUM_834220
 277         {
 278         /* Cortex-A57 r0p0 - r1p2 */
 279                 .desc = "ARM erratum 834220",
 280                 .capability = ARM64_WORKAROUND_834220,
 281                 MIDR_RANGE(MIDR_CORTEX_A57,
 282                            MIDR_CPU_VAR_REV(0, 0),
 283                            MIDR_CPU_VAR_REV(1, 2)),
 284         },
 285 #endif
 286 #ifdef CONFIG_ARM64_ERRATUM_845719
 287         {
 288         /* Cortex-A53 r0p[01234] */
 289                 .desc = "ARM erratum 845719",
 290                 .capability = ARM64_WORKAROUND_845719,
 291                 MIDR_RANGE(MIDR_CORTEX_A53, 0x00, 0x04),
 292         },
 293 #endif
 294 #ifdef CONFIG_CAVIUM_ERRATUM_23154
 295         {
 296         /* Cavium ThunderX, pass 1.x */
 297                 .desc = "Cavium erratum 23154",
 298                 .capability = ARM64_WORKAROUND_CAVIUM_23154,
 299                 MIDR_RANGE(MIDR_THUNDERX, 0x00, 0x01),
 300         },
 301 #endif
 302 #ifdef CONFIG_CAVIUM_ERRATUM_27456
 303         {
 304         /* Cavium ThunderX, T88 pass 1.x - 2.1 */
 305                 .desc = "Cavium erratum 27456",
 306                 .capability = ARM64_WORKAROUND_CAVIUM_27456,
 307                 MIDR_RANGE(MIDR_THUNDERX,
 308                            MIDR_CPU_VAR_REV(0, 0),
 309                            MIDR_CPU_VAR_REV(1, 1)),
 310         },
 311         {
 312         /* Cavium ThunderX, T81 pass 1.0 */
 313                 .desc = "Cavium erratum 27456",
 314                 .capability = ARM64_WORKAROUND_CAVIUM_27456,
 315                 MIDR_RANGE(MIDR_THUNDERX_81XX, 0x00, 0x00),
 316         },
 317 #endif
 318 #ifdef CONFIG_CAVIUM_ERRATUM_30115
 319         {
 320         /* Cavium ThunderX, T88 pass 1.x - 2.2 */
 321                 .desc = "Cavium erratum 30115",
 322                 .capability = ARM64_WORKAROUND_CAVIUM_30115,
 323                 MIDR_RANGE(MIDR_THUNDERX, 0x00,
 324                            (1 << MIDR_VARIANT_SHIFT) | 2),
 325         },
 326         {
 327         /* Cavium ThunderX, T81 pass 1.0 - 1.2 */
 328                 .desc = "Cavium erratum 30115",
 329                 .capability = ARM64_WORKAROUND_CAVIUM_30115,
 330                 MIDR_RANGE(MIDR_THUNDERX_81XX, 0x00, 0x02),
 331         },
 332         {
 333         /* Cavium ThunderX, T83 pass 1.0 */
 334                 .desc = "Cavium erratum 30115",
 335                 .capability = ARM64_WORKAROUND_CAVIUM_30115,
 336                 MIDR_RANGE(MIDR_THUNDERX_83XX, 0x00, 0x00),
 337         },
 338 #endif
 339         {
 340                 .desc = "Mismatched cache line size",
 341                 .capability = ARM64_MISMATCHED_CACHE_LINE_SIZE,
 342                 .matches = has_mismatched_cache_line_size,
 343                 .def_scope = SCOPE_LOCAL_CPU,
 344                 .enable = cpu_enable_trap_ctr_access,
 345         },
 346 #ifdef CONFIG_QCOM_FALKOR_ERRATUM_1003
 347         {
 348                 .desc = "Qualcomm Technologies Falkor erratum 1003",
 349                 .capability = ARM64_WORKAROUND_QCOM_FALKOR_E1003,
 350                 MIDR_RANGE(MIDR_QCOM_FALKOR_V1,
 351                            MIDR_CPU_VAR_REV(0, 0),
 352                            MIDR_CPU_VAR_REV(0, 0)),
 353         },
 354         {
 355                 .desc = "Qualcomm Technologies Kryo erratum 1003",
 356                 .capability = ARM64_WORKAROUND_QCOM_FALKOR_E1003,
 357                 .def_scope = SCOPE_LOCAL_CPU,
 358                 .midr_model = MIDR_QCOM_KRYO,
 359                 .matches = is_kryo_midr,
 360         },
 361 #endif
 362 #ifdef CONFIG_QCOM_FALKOR_ERRATUM_1009
 363         {
 364                 .desc = "Qualcomm Technologies Falkor erratum 1009",
 365                 .capability = ARM64_WORKAROUND_REPEAT_TLBI,
 366                 MIDR_RANGE(MIDR_QCOM_FALKOR_V1,
 367                            MIDR_CPU_VAR_REV(0, 0),
 368                            MIDR_CPU_VAR_REV(0, 0)),
 369         },
 370 #endif
 371 #ifdef CONFIG_ARM64_ERRATUM_858921
 372         {
 373         /* Cortex-A73 all versions */
 374                 .desc = "ARM erratum 858921",
 375                 .capability = ARM64_WORKAROUND_858921,
 376                 MIDR_ALL_VERSIONS(MIDR_CORTEX_A73),
 377         },
 378 #endif
 379 #ifdef CONFIG_HARDEN_BRANCH_PREDICTOR
 380         {
 381                 .capability = ARM64_HARDEN_BRANCH_PREDICTOR,
 382                 MIDR_ALL_VERSIONS(MIDR_CORTEX_A57),
 383                 .enable = enable_smccc_arch_workaround_1,
 384         },
 385         {
 386                 .capability = ARM64_HARDEN_BRANCH_PREDICTOR,
 387                 MIDR_ALL_VERSIONS(MIDR_CORTEX_A72),
 388                 .enable = enable_smccc_arch_workaround_1,
 389         },
 390         {
 391                 .capability = ARM64_HARDEN_BRANCH_PREDICTOR,
 392                 MIDR_ALL_VERSIONS(MIDR_CORTEX_A73),
 393                 .enable = enable_smccc_arch_workaround_1,
 394         },
 395         {
 396                 .capability = ARM64_HARDEN_BRANCH_PREDICTOR,
 397                 MIDR_ALL_VERSIONS(MIDR_CORTEX_A75),
 398                 .enable = enable_smccc_arch_workaround_1,
 399         },
 400         {
 401                 .capability = ARM64_HARDEN_BRANCH_PREDICTOR,
 402                 MIDR_ALL_VERSIONS(MIDR_QCOM_FALKOR_V1),
 403                 .enable = qcom_enable_link_stack_sanitization,
 404         },
 405         {
 406                 .capability = ARM64_HARDEN_BP_POST_GUEST_EXIT,
 407                 MIDR_ALL_VERSIONS(MIDR_QCOM_FALKOR_V1),
 408         },
 409         {
 410                 .capability = ARM64_HARDEN_BRANCH_PREDICTOR,
 411                 MIDR_ALL_VERSIONS(MIDR_QCOM_FALKOR),
 412                 .enable = qcom_enable_link_stack_sanitization,
 413         },
 414         {
 415                 .capability = ARM64_HARDEN_BP_POST_GUEST_EXIT,
 416                 MIDR_ALL_VERSIONS(MIDR_QCOM_FALKOR),
 417         },
 418         {
 419                 .capability = ARM64_HARDEN_BRANCH_PREDICTOR,
 420                 MIDR_ALL_VERSIONS(MIDR_BRCM_VULCAN),
 421                 .enable = enable_smccc_arch_workaround_1,
 422         },
 423         {
 424                 .capability = ARM64_HARDEN_BRANCH_PREDICTOR,
 425                 MIDR_ALL_VERSIONS(MIDR_CAVIUM_THUNDERX2),
 426                 .enable = enable_smccc_arch_workaround_1,
 427         },
 428 #endif
 429         {
 430         }
 431 };
 432
 433 /*
 434  * The CPU Errata work arounds are detected and applied at boot time
 435  * and the related information is freed soon after. If the new CPU requires
 436  * an errata not detected at boot, fail this CPU.
 437  */
 438 void verify_local_cpu_errata_workarounds(void)
 439 {
 440         const struct arm64_cpu_capabilities *caps = arm64_errata;
 441
 442         for (; caps->matches; caps++) {
 443                 if (cpus_have_cap(caps->capability)) {
 444                         if (caps->enable)
 445                                 caps->enable((void *)caps);
 446                 } else if (caps->matches(caps, SCOPE_LOCAL_CPU)) {
 447                         pr_crit("CPU%d: Requires work around for %s, not detected"
 448                                         " at boot time\n",
 449                                 smp_processor_id(),
 450                                 caps->desc ? : "an erratum");
 451                         cpu_die_early();
 452                 }
 453         }
 454 }
 455
 456 void update_cpu_errata_workarounds(void)
 457 {
 458         update_cpu_capabilities(arm64_errata, "enabling workaround for");
 459 }
 460
 461 void __init enable_errata_workarounds(void)
 462 {
 463         enable_cpu_capabilities(arm64_errata);
 464 }