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 const struct arm64_midr_revidr *fix; 28 u32 midr = read_cpuid_id(), revidr; 29 30 WARN_ON(scope != SCOPE_LOCAL_CPU || preemptible()); 31 if (!is_midr_in_range(midr, &entry->midr_range)) 32 return false; 33 34 midr &= MIDR_REVISION_MASK | MIDR_VARIANT_MASK; 35 revidr = read_cpuid(REVIDR_EL1); 36 for (fix = entry->fixed_revs; fix && fix->revidr_mask; fix++) 37 if (midr == fix->midr_rv && (revidr & fix->revidr_mask)) 38 return false; 39 40 return true; 41 } 42 43 static bool __maybe_unused 44 is_affected_midr_range_list(const struct arm64_cpu_capabilities *entry, 45 int scope) 46 { 47 WARN_ON(scope != SCOPE_LOCAL_CPU || preemptible()); 48 return is_midr_in_range_list(read_cpuid_id(), entry->midr_range_list); 49 } 50 51 static bool __maybe_unused 52 is_kryo_midr(const struct arm64_cpu_capabilities *entry, int scope) 53 { 54 u32 model; 55 56 WARN_ON(scope != SCOPE_LOCAL_CPU || preemptible()); 57 58 model = read_cpuid_id(); 59 model &= MIDR_IMPLEMENTOR_MASK | (0xf00 << MIDR_PARTNUM_SHIFT) | 60 MIDR_ARCHITECTURE_MASK; 61 62 return model == entry->midr_range.model; 63 } 64 65 static bool 66 has_mismatched_cache_line_size(const struct arm64_cpu_capabilities *entry, 67 int scope) 68 { 69 WARN_ON(scope != SCOPE_LOCAL_CPU || preemptible()); 70 return (read_cpuid_cachetype() & arm64_ftr_reg_ctrel0.strict_mask) != 71 (arm64_ftr_reg_ctrel0.sys_val & arm64_ftr_reg_ctrel0.strict_mask); 72 } 73 74 static void 75 cpu_enable_trap_ctr_access(const struct arm64_cpu_capabilities *__unused) 76 { 77 /* Clear SCTLR_EL1.UCT */ 78 config_sctlr_el1(SCTLR_EL1_UCT, 0); 79 } 80 81 atomic_t arm64_el2_vector_last_slot = ATOMIC_INIT(-1); 82 83 #ifdef CONFIG_HARDEN_BRANCH_PREDICTOR 84 #include <asm/mmu_context.h> 85 #include <asm/cacheflush.h> 86 87 DEFINE_PER_CPU_READ_MOSTLY(struct bp_hardening_data, bp_hardening_data); 88 89 #ifdef CONFIG_KVM_INDIRECT_VECTORS 90 extern char __smccc_workaround_1_smc_start[]; 91 extern char __smccc_workaround_1_smc_end[]; 92 93 static void __copy_hyp_vect_bpi(int slot, const char *hyp_vecs_start, 94 const char *hyp_vecs_end) 95 { 96 void *dst = lm_alias(__bp_harden_hyp_vecs_start + slot * SZ_2K); 97 int i; 98 99 for (i = 0; i < SZ_2K; i += 0x80) 100 memcpy(dst + i, hyp_vecs_start, hyp_vecs_end - hyp_vecs_start); 101 102 flush_icache_range((uintptr_t)dst, (uintptr_t)dst + SZ_2K); 103 } 104 105 static void __install_bp_hardening_cb(bp_hardening_cb_t fn, 106 const char *hyp_vecs_start, 107 const char *hyp_vecs_end) 108 { 109 static DEFINE_SPINLOCK(bp_lock); 110 int cpu, slot = -1; 111 112 spin_lock(&bp_lock); 113 for_each_possible_cpu(cpu) { 114 if (per_cpu(bp_hardening_data.fn, cpu) == fn) { 115 slot = per_cpu(bp_hardening_data.hyp_vectors_slot, cpu); 116 break; 117 } 118 } 119 120 if (slot == -1) { 121 slot = atomic_inc_return(&arm64_el2_vector_last_slot); 122 BUG_ON(slot >= BP_HARDEN_EL2_SLOTS); 123 __copy_hyp_vect_bpi(slot, hyp_vecs_start, hyp_vecs_end); 124 } 125 126 __this_cpu_write(bp_hardening_data.hyp_vectors_slot, slot); 127 __this_cpu_write(bp_hardening_data.fn, fn); 128 spin_unlock(&bp_lock); 129 } 130 #else 131 #define __smccc_workaround_1_smc_start NULL 132 #define __smccc_workaround_1_smc_end NULL 133 134 static void __install_bp_hardening_cb(bp_hardening_cb_t fn, 135 const char *hyp_vecs_start, 136 const char *hyp_vecs_end) 137 { 138 __this_cpu_write(bp_hardening_data.fn, fn); 139 } 140 #endif /* CONFIG_KVM_INDIRECT_VECTORS */ 141 142 static void install_bp_hardening_cb(const struct arm64_cpu_capabilities *entry, 143 bp_hardening_cb_t fn, 144 const char *hyp_vecs_start, 145 const char *hyp_vecs_end) 146 { 147 u64 pfr0; 148 149 if (!entry->matches(entry, SCOPE_LOCAL_CPU)) 150 return; 151 152 pfr0 = read_cpuid(ID_AA64PFR0_EL1); 153 if (cpuid_feature_extract_unsigned_field(pfr0, ID_AA64PFR0_CSV2_SHIFT)) 154 return; 155 156 __install_bp_hardening_cb(fn, hyp_vecs_start, hyp_vecs_end); 157 } 158 159 #include <uapi/linux/psci.h> 160 #include <linux/arm-smccc.h> 161 #include <linux/psci.h> 162 163 static void call_smc_arch_workaround_1(void) 164 { 165 arm_smccc_1_1_smc(ARM_SMCCC_ARCH_WORKAROUND_1, NULL); 166 } 167 168 static void call_hvc_arch_workaround_1(void) 169 { 170 arm_smccc_1_1_hvc(ARM_SMCCC_ARCH_WORKAROUND_1, NULL); 171 } 172 173 static void qcom_link_stack_sanitization(void) 174 { 175 u64 tmp; 176 177 asm volatile("mov %0, x30 \n" 178 ".rept 16 \n" 179 "bl . + 4 \n" 180 ".endr \n" 181 "mov x30, %0 \n" 182 : "=&r" (tmp)); 183 } 184 185 static void 186 enable_smccc_arch_workaround_1(const struct arm64_cpu_capabilities *entry) 187 { 188 bp_hardening_cb_t cb; 189 void *smccc_start, *smccc_end; 190 struct arm_smccc_res res; 191 u32 midr = read_cpuid_id(); 192 193 if (!entry->matches(entry, SCOPE_LOCAL_CPU)) 194 return; 195 196 if (psci_ops.smccc_version == SMCCC_VERSION_1_0) 197 return; 198 199 switch (psci_ops.conduit) { 200 case PSCI_CONDUIT_HVC: 201 arm_smccc_1_1_hvc(ARM_SMCCC_ARCH_FEATURES_FUNC_ID, 202 ARM_SMCCC_ARCH_WORKAROUND_1, &res); 203 if ((int)res.a0 < 0) 204 return; 205 cb = call_hvc_arch_workaround_1; 206 /* This is a guest, no need to patch KVM vectors */ 207 smccc_start = NULL; 208 smccc_end = NULL; 209 break; 210 211 case PSCI_CONDUIT_SMC: 212 arm_smccc_1_1_smc(ARM_SMCCC_ARCH_FEATURES_FUNC_ID, 213 ARM_SMCCC_ARCH_WORKAROUND_1, &res); 214 if ((int)res.a0 < 0) 215 return; 216 cb = call_smc_arch_workaround_1; 217 smccc_start = __smccc_workaround_1_smc_start; 218 smccc_end = __smccc_workaround_1_smc_end; 219 break; 220 221 default: 222 return; 223 } 224 225 if (((midr & MIDR_CPU_MODEL_MASK) == MIDR_QCOM_FALKOR) || 226 ((midr & MIDR_CPU_MODEL_MASK) == MIDR_QCOM_FALKOR_V1)) 227 cb = qcom_link_stack_sanitization; 228 229 install_bp_hardening_cb(entry, cb, smccc_start, smccc_end); 230 231 return; 232 } 233 #endif /* CONFIG_HARDEN_BRANCH_PREDICTOR */ 234 235 #define CAP_MIDR_RANGE(model, v_min, r_min, v_max, r_max) \ 236 .matches = is_affected_midr_range, \ 237 .midr_range = MIDR_RANGE(model, v_min, r_min, v_max, r_max) 238 239 #define CAP_MIDR_ALL_VERSIONS(model) \ 240 .matches = is_affected_midr_range, \ 241 .midr_range = MIDR_ALL_VERSIONS(model) 242 243 #define MIDR_FIXED(rev, revidr_mask) \ 244 .fixed_revs = (struct arm64_midr_revidr[]){{ (rev), (revidr_mask) }, {}} 245 246 #define ERRATA_MIDR_RANGE(model, v_min, r_min, v_max, r_max) \ 247 .type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM, \ 248 CAP_MIDR_RANGE(model, v_min, r_min, v_max, r_max) 249 250 #define CAP_MIDR_RANGE_LIST(list) \ 251 .matches = is_affected_midr_range_list, \ 252 .midr_range_list = list 253 254 /* Errata affecting a range of revisions of given model variant */ 255 #define ERRATA_MIDR_REV_RANGE(m, var, r_min, r_max) \ 256 ERRATA_MIDR_RANGE(m, var, r_min, var, r_max) 257 258 /* Errata affecting a single variant/revision of a model */ 259 #define ERRATA_MIDR_REV(model, var, rev) \ 260 ERRATA_MIDR_RANGE(model, var, rev, var, rev) 261 262 /* Errata affecting all variants/revisions of a given a model */ 263 #define ERRATA_MIDR_ALL_VERSIONS(model) \ 264 .type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM, \ 265 CAP_MIDR_ALL_VERSIONS(model) 266 267 /* Errata affecting a list of midr ranges, with same work around */ 268 #define ERRATA_MIDR_RANGE_LIST(midr_list) \ 269 .type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM, \ 270 CAP_MIDR_RANGE_LIST(midr_list) 271 272 /* 273 * Generic helper for handling capabilties with multiple (match,enable) pairs 274 * of call backs, sharing the same capability bit. 275 * Iterate over each entry to see if at least one matches. 276 */ 277 static bool __maybe_unused 278 multi_entry_cap_matches(const struct arm64_cpu_capabilities *entry, int scope) 279 { 280 const struct arm64_cpu_capabilities *caps; 281 282 for (caps = entry->match_list; caps->matches; caps++) 283 if (caps->matches(caps, scope)) 284 return true; 285 286 return false; 287 } 288 289 /* 290 * Take appropriate action for all matching entries in the shared capability 291 * entry. 292 */ 293 static void __maybe_unused 294 multi_entry_cap_cpu_enable(const struct arm64_cpu_capabilities *entry) 295 { 296 const struct arm64_cpu_capabilities *caps; 297 298 for (caps = entry->match_list; caps->matches; caps++) 299 if (caps->matches(caps, SCOPE_LOCAL_CPU) && 300 caps->cpu_enable) 301 caps->cpu_enable(caps); 302 } 303 304 #ifdef CONFIG_HARDEN_BRANCH_PREDICTOR 305 306 /* 307 * List of CPUs where we need to issue a psci call to 308 * harden the branch predictor. 309 */ 310 static const struct midr_range arm64_bp_harden_smccc_cpus[] = { 311 MIDR_ALL_VERSIONS(MIDR_CORTEX_A57), 312 MIDR_ALL_VERSIONS(MIDR_CORTEX_A72), 313 MIDR_ALL_VERSIONS(MIDR_CORTEX_A73), 314 MIDR_ALL_VERSIONS(MIDR_CORTEX_A75), 315 MIDR_ALL_VERSIONS(MIDR_BRCM_VULCAN), 316 MIDR_ALL_VERSIONS(MIDR_CAVIUM_THUNDERX2), 317 MIDR_ALL_VERSIONS(MIDR_QCOM_FALKOR_V1), 318 MIDR_ALL_VERSIONS(MIDR_QCOM_FALKOR), 319 {}, 320 }; 321 322 #endif 323 324 #ifdef CONFIG_HARDEN_EL2_VECTORS 325 326 static const struct midr_range arm64_harden_el2_vectors[] = { 327 MIDR_ALL_VERSIONS(MIDR_CORTEX_A57), 328 MIDR_ALL_VERSIONS(MIDR_CORTEX_A72), 329 {}, 330 }; 331 332 #endif 333 334 const struct arm64_cpu_capabilities arm64_errata[] = { 335 #if defined(CONFIG_ARM64_ERRATUM_826319) || \ 336 defined(CONFIG_ARM64_ERRATUM_827319) || \ 337 defined(CONFIG_ARM64_ERRATUM_824069) 338 { 339 /* Cortex-A53 r0p[012] */ 340 .desc = "ARM errata 826319, 827319, 824069", 341 .capability = ARM64_WORKAROUND_CLEAN_CACHE, 342 ERRATA_MIDR_REV_RANGE(MIDR_CORTEX_A53, 0, 0, 2), 343 .cpu_enable = cpu_enable_cache_maint_trap, 344 }, 345 #endif 346 #ifdef CONFIG_ARM64_ERRATUM_819472 347 { 348 /* Cortex-A53 r0p[01] */ 349 .desc = "ARM errata 819472", 350 .capability = ARM64_WORKAROUND_CLEAN_CACHE, 351 ERRATA_MIDR_REV_RANGE(MIDR_CORTEX_A53, 0, 0, 1), 352 .cpu_enable = cpu_enable_cache_maint_trap, 353 }, 354 #endif 355 #ifdef CONFIG_ARM64_ERRATUM_832075 356 { 357 /* Cortex-A57 r0p0 - r1p2 */ 358 .desc = "ARM erratum 832075", 359 .capability = ARM64_WORKAROUND_DEVICE_LOAD_ACQUIRE, 360 ERRATA_MIDR_RANGE(MIDR_CORTEX_A57, 361 0, 0, 362 1, 2), 363 }, 364 #endif 365 #ifdef CONFIG_ARM64_ERRATUM_834220 366 { 367 /* Cortex-A57 r0p0 - r1p2 */ 368 .desc = "ARM erratum 834220", 369 .capability = ARM64_WORKAROUND_834220, 370 ERRATA_MIDR_RANGE(MIDR_CORTEX_A57, 371 0, 0, 372 1, 2), 373 }, 374 #endif 375 #ifdef CONFIG_ARM64_ERRATUM_843419 376 { 377 /* Cortex-A53 r0p[01234] */ 378 .desc = "ARM erratum 843419", 379 .capability = ARM64_WORKAROUND_843419, 380 ERRATA_MIDR_REV_RANGE(MIDR_CORTEX_A53, 0, 0, 4), 381 MIDR_FIXED(0x4, BIT(8)), 382 }, 383 #endif 384 #ifdef CONFIG_ARM64_ERRATUM_845719 385 { 386 /* Cortex-A53 r0p[01234] */ 387 .desc = "ARM erratum 845719", 388 .capability = ARM64_WORKAROUND_845719, 389 ERRATA_MIDR_REV_RANGE(MIDR_CORTEX_A53, 0, 0, 4), 390 }, 391 #endif 392 #ifdef CONFIG_CAVIUM_ERRATUM_23154 393 { 394 /* Cavium ThunderX, pass 1.x */ 395 .desc = "Cavium erratum 23154", 396 .capability = ARM64_WORKAROUND_CAVIUM_23154, 397 ERRATA_MIDR_REV_RANGE(MIDR_THUNDERX, 0, 0, 1), 398 }, 399 #endif 400 #ifdef CONFIG_CAVIUM_ERRATUM_27456 401 { 402 /* Cavium ThunderX, T88 pass 1.x - 2.1 */ 403 .desc = "Cavium erratum 27456", 404 .capability = ARM64_WORKAROUND_CAVIUM_27456, 405 ERRATA_MIDR_RANGE(MIDR_THUNDERX, 406 0, 0, 407 1, 1), 408 }, 409 { 410 /* Cavium ThunderX, T81 pass 1.0 */ 411 .desc = "Cavium erratum 27456", 412 .capability = ARM64_WORKAROUND_CAVIUM_27456, 413 ERRATA_MIDR_REV(MIDR_THUNDERX_81XX, 0, 0), 414 }, 415 #endif 416 #ifdef CONFIG_CAVIUM_ERRATUM_30115 417 { 418 /* Cavium ThunderX, T88 pass 1.x - 2.2 */ 419 .desc = "Cavium erratum 30115", 420 .capability = ARM64_WORKAROUND_CAVIUM_30115, 421 ERRATA_MIDR_RANGE(MIDR_THUNDERX, 422 0, 0, 423 1, 2), 424 }, 425 { 426 /* Cavium ThunderX, T81 pass 1.0 - 1.2 */ 427 .desc = "Cavium erratum 30115", 428 .capability = ARM64_WORKAROUND_CAVIUM_30115, 429 ERRATA_MIDR_REV_RANGE(MIDR_THUNDERX_81XX, 0, 0, 2), 430 }, 431 { 432 /* Cavium ThunderX, T83 pass 1.0 */ 433 .desc = "Cavium erratum 30115", 434 .capability = ARM64_WORKAROUND_CAVIUM_30115, 435 ERRATA_MIDR_REV(MIDR_THUNDERX_83XX, 0, 0), 436 }, 437 #endif 438 { 439 .desc = "Mismatched cache line size", 440 .capability = ARM64_MISMATCHED_CACHE_LINE_SIZE, 441 .matches = has_mismatched_cache_line_size, 442 .type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM, 443 .cpu_enable = cpu_enable_trap_ctr_access, 444 }, 445 #ifdef CONFIG_QCOM_FALKOR_ERRATUM_1003 446 { 447 .desc = "Qualcomm Technologies Falkor erratum 1003", 448 .capability = ARM64_WORKAROUND_QCOM_FALKOR_E1003, 449 ERRATA_MIDR_REV(MIDR_QCOM_FALKOR_V1, 0, 0), 450 }, 451 { 452 .desc = "Qualcomm Technologies Kryo erratum 1003", 453 .capability = ARM64_WORKAROUND_QCOM_FALKOR_E1003, 454 .type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM, 455 .midr_range.model = MIDR_QCOM_KRYO, 456 .matches = is_kryo_midr, 457 }, 458 #endif 459 #ifdef CONFIG_QCOM_FALKOR_ERRATUM_1009 460 { 461 .desc = "Qualcomm Technologies Falkor erratum 1009", 462 .capability = ARM64_WORKAROUND_REPEAT_TLBI, 463 ERRATA_MIDR_REV(MIDR_QCOM_FALKOR_V1, 0, 0), 464 }, 465 #endif 466 #ifdef CONFIG_ARM64_ERRATUM_858921 467 { 468 /* Cortex-A73 all versions */ 469 .desc = "ARM erratum 858921", 470 .capability = ARM64_WORKAROUND_858921, 471 ERRATA_MIDR_ALL_VERSIONS(MIDR_CORTEX_A73), 472 }, 473 #endif 474 #ifdef CONFIG_HARDEN_BRANCH_PREDICTOR 475 { 476 .capability = ARM64_HARDEN_BRANCH_PREDICTOR, 477 .type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM, 478 .cpu_enable = enable_smccc_arch_workaround_1, 479 ERRATA_MIDR_RANGE_LIST(arm64_bp_harden_smccc_cpus), 480 }, 481 #endif 482 #ifdef CONFIG_HARDEN_EL2_VECTORS 483 { 484 .desc = "EL2 vector hardening", 485 .capability = ARM64_HARDEN_EL2_VECTORS, 486 .type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM, 487 ERRATA_MIDR_RANGE_LIST(arm64_harden_el2_vectors), 488 }, 489 #endif 490 { 491 } 492 }; 493