1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Contains CPU feature definitions 4 * 5 * Copyright (C) 2015 ARM Ltd. 6 * 7 * A note for the weary kernel hacker: the code here is confusing and hard to 8 * follow! That's partly because it's solving a nasty problem, but also because 9 * there's a little bit of over-abstraction that tends to obscure what's going 10 * on behind a maze of helper functions and macros. 11 * 12 * The basic problem is that hardware folks have started gluing together CPUs 13 * with distinct architectural features; in some cases even creating SoCs where 14 * user-visible instructions are available only on a subset of the available 15 * cores. We try to address this by snapshotting the feature registers of the 16 * boot CPU and comparing these with the feature registers of each secondary 17 * CPU when bringing them up. If there is a mismatch, then we update the 18 * snapshot state to indicate the lowest-common denominator of the feature, 19 * known as the "safe" value. This snapshot state can be queried to view the 20 * "sanitised" value of a feature register. 21 * 22 * The sanitised register values are used to decide which capabilities we 23 * have in the system. These may be in the form of traditional "hwcaps" 24 * advertised to userspace or internal "cpucaps" which are used to configure 25 * things like alternative patching and static keys. While a feature mismatch 26 * may result in a TAINT_CPU_OUT_OF_SPEC kernel taint, a capability mismatch 27 * may prevent a CPU from being onlined at all. 28 * 29 * Some implementation details worth remembering: 30 * 31 * - Mismatched features are *always* sanitised to a "safe" value, which 32 * usually indicates that the feature is not supported. 33 * 34 * - A mismatched feature marked with FTR_STRICT will cause a "SANITY CHECK" 35 * warning when onlining an offending CPU and the kernel will be tainted 36 * with TAINT_CPU_OUT_OF_SPEC. 37 * 38 * - Features marked as FTR_VISIBLE have their sanitised value visible to 39 * userspace. FTR_VISIBLE features in registers that are only visible 40 * to EL0 by trapping *must* have a corresponding HWCAP so that late 41 * onlining of CPUs cannot lead to features disappearing at runtime. 42 * 43 * - A "feature" is typically a 4-bit register field. A "capability" is the 44 * high-level description derived from the sanitised field value. 45 * 46 * - Read the Arm ARM (DDI 0487F.a) section D13.1.3 ("Principles of the ID 47 * scheme for fields in ID registers") to understand when feature fields 48 * may be signed or unsigned (FTR_SIGNED and FTR_UNSIGNED accordingly). 49 * 50 * - KVM exposes its own view of the feature registers to guest operating 51 * systems regardless of FTR_VISIBLE. This is typically driven from the 52 * sanitised register values to allow virtual CPUs to be migrated between 53 * arbitrary physical CPUs, but some features not present on the host are 54 * also advertised and emulated. Look at sys_reg_descs[] for the gory 55 * details. 56 * 57 * - If the arm64_ftr_bits[] for a register has a missing field, then this 58 * field is treated as STRICT RES0, including for read_sanitised_ftr_reg(). 59 * This is stronger than FTR_HIDDEN and can be used to hide features from 60 * KVM guests. 61 */ 62 63 #define pr_fmt(fmt) "CPU features: " fmt 64 65 #include <linux/bsearch.h> 66 #include <linux/cpumask.h> 67 #include <linux/crash_dump.h> 68 #include <linux/sort.h> 69 #include <linux/stop_machine.h> 70 #include <linux/sysfs.h> 71 #include <linux/types.h> 72 #include <linux/minmax.h> 73 #include <linux/mm.h> 74 #include <linux/cpu.h> 75 #include <linux/kasan.h> 76 #include <linux/percpu.h> 77 78 #include <asm/cpu.h> 79 #include <asm/cpufeature.h> 80 #include <asm/cpu_ops.h> 81 #include <asm/fpsimd.h> 82 #include <asm/hwcap.h> 83 #include <asm/insn.h> 84 #include <asm/kvm_host.h> 85 #include <asm/mmu_context.h> 86 #include <asm/mte.h> 87 #include <asm/processor.h> 88 #include <asm/smp.h> 89 #include <asm/sysreg.h> 90 #include <asm/traps.h> 91 #include <asm/vectors.h> 92 #include <asm/virt.h> 93 94 /* Kernel representation of AT_HWCAP and AT_HWCAP2 */ 95 static DECLARE_BITMAP(elf_hwcap, MAX_CPU_FEATURES) __read_mostly; 96 97 #ifdef CONFIG_COMPAT 98 #define COMPAT_ELF_HWCAP_DEFAULT \ 99 (COMPAT_HWCAP_HALF|COMPAT_HWCAP_THUMB|\ 100 COMPAT_HWCAP_FAST_MULT|COMPAT_HWCAP_EDSP|\ 101 COMPAT_HWCAP_TLS|COMPAT_HWCAP_IDIV|\ 102 COMPAT_HWCAP_LPAE) 103 unsigned int compat_elf_hwcap __read_mostly = COMPAT_ELF_HWCAP_DEFAULT; 104 unsigned int compat_elf_hwcap2 __read_mostly; 105 #endif 106 107 DECLARE_BITMAP(cpu_hwcaps, ARM64_NCAPS); 108 EXPORT_SYMBOL(cpu_hwcaps); 109 static struct arm64_cpu_capabilities const __ro_after_init *cpu_hwcaps_ptrs[ARM64_NCAPS]; 110 111 /* Need also bit for ARM64_CB_PATCH */ 112 DECLARE_BITMAP(boot_capabilities, ARM64_NPATCHABLE); 113 114 bool arm64_use_ng_mappings = false; 115 EXPORT_SYMBOL(arm64_use_ng_mappings); 116 117 DEFINE_PER_CPU_READ_MOSTLY(const char *, this_cpu_vector) = vectors; 118 119 /* 120 * Permit PER_LINUX32 and execve() of 32-bit binaries even if not all CPUs 121 * support it? 122 */ 123 static bool __read_mostly allow_mismatched_32bit_el0; 124 125 /* 126 * Static branch enabled only if allow_mismatched_32bit_el0 is set and we have 127 * seen at least one CPU capable of 32-bit EL0. 128 */ 129 DEFINE_STATIC_KEY_FALSE(arm64_mismatched_32bit_el0); 130 131 /* 132 * Mask of CPUs supporting 32-bit EL0. 133 * Only valid if arm64_mismatched_32bit_el0 is enabled. 134 */ 135 static cpumask_var_t cpu_32bit_el0_mask __cpumask_var_read_mostly; 136 137 /* 138 * Flag to indicate if we have computed the system wide 139 * capabilities based on the boot time active CPUs. This 140 * will be used to determine if a new booting CPU should 141 * go through the verification process to make sure that it 142 * supports the system capabilities, without using a hotplug 143 * notifier. This is also used to decide if we could use 144 * the fast path for checking constant CPU caps. 145 */ 146 DEFINE_STATIC_KEY_FALSE(arm64_const_caps_ready); 147 EXPORT_SYMBOL(arm64_const_caps_ready); 148 static inline void finalize_system_capabilities(void) 149 { 150 static_branch_enable(&arm64_const_caps_ready); 151 } 152 153 void dump_cpu_features(void) 154 { 155 /* file-wide pr_fmt adds "CPU features: " prefix */ 156 pr_emerg("0x%*pb\n", ARM64_NCAPS, &cpu_hwcaps); 157 } 158 159 DEFINE_STATIC_KEY_ARRAY_FALSE(cpu_hwcap_keys, ARM64_NCAPS); 160 EXPORT_SYMBOL(cpu_hwcap_keys); 161 162 #define __ARM64_FTR_BITS(SIGNED, VISIBLE, STRICT, TYPE, SHIFT, WIDTH, SAFE_VAL) \ 163 { \ 164 .sign = SIGNED, \ 165 .visible = VISIBLE, \ 166 .strict = STRICT, \ 167 .type = TYPE, \ 168 .shift = SHIFT, \ 169 .width = WIDTH, \ 170 .safe_val = SAFE_VAL, \ 171 } 172 173 /* Define a feature with unsigned values */ 174 #define ARM64_FTR_BITS(VISIBLE, STRICT, TYPE, SHIFT, WIDTH, SAFE_VAL) \ 175 __ARM64_FTR_BITS(FTR_UNSIGNED, VISIBLE, STRICT, TYPE, SHIFT, WIDTH, SAFE_VAL) 176 177 /* Define a feature with a signed value */ 178 #define S_ARM64_FTR_BITS(VISIBLE, STRICT, TYPE, SHIFT, WIDTH, SAFE_VAL) \ 179 __ARM64_FTR_BITS(FTR_SIGNED, VISIBLE, STRICT, TYPE, SHIFT, WIDTH, SAFE_VAL) 180 181 #define ARM64_FTR_END \ 182 { \ 183 .width = 0, \ 184 } 185 186 static void cpu_enable_cnp(struct arm64_cpu_capabilities const *cap); 187 188 static bool __system_matches_cap(unsigned int n); 189 190 /* 191 * NOTE: Any changes to the visibility of features should be kept in 192 * sync with the documentation of the CPU feature register ABI. 193 */ 194 static const struct arm64_ftr_bits ftr_id_aa64isar0[] = { 195 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_EL1_RNDR_SHIFT, 4, 0), 196 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_EL1_TLB_SHIFT, 4, 0), 197 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_EL1_TS_SHIFT, 4, 0), 198 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_EL1_FHM_SHIFT, 4, 0), 199 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_EL1_DP_SHIFT, 4, 0), 200 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_EL1_SM4_SHIFT, 4, 0), 201 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_EL1_SM3_SHIFT, 4, 0), 202 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_EL1_SHA3_SHIFT, 4, 0), 203 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_EL1_RDM_SHIFT, 4, 0), 204 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_EL1_ATOMIC_SHIFT, 4, 0), 205 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_EL1_CRC32_SHIFT, 4, 0), 206 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_EL1_SHA2_SHIFT, 4, 0), 207 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_EL1_SHA1_SHIFT, 4, 0), 208 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_EL1_AES_SHIFT, 4, 0), 209 ARM64_FTR_END, 210 }; 211 212 static const struct arm64_ftr_bits ftr_id_aa64isar1[] = { 213 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_EL1_I8MM_SHIFT, 4, 0), 214 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_EL1_DGH_SHIFT, 4, 0), 215 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_EL1_BF16_SHIFT, 4, 0), 216 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_EL1_SPECRES_SHIFT, 4, 0), 217 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_EL1_SB_SHIFT, 4, 0), 218 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_EL1_FRINTTS_SHIFT, 4, 0), 219 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_PTR_AUTH), 220 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_EL1_GPI_SHIFT, 4, 0), 221 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_PTR_AUTH), 222 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_EL1_GPA_SHIFT, 4, 0), 223 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_EL1_LRCPC_SHIFT, 4, 0), 224 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_EL1_FCMA_SHIFT, 4, 0), 225 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_EL1_JSCVT_SHIFT, 4, 0), 226 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_PTR_AUTH), 227 FTR_STRICT, FTR_EXACT, ID_AA64ISAR1_EL1_API_SHIFT, 4, 0), 228 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_PTR_AUTH), 229 FTR_STRICT, FTR_EXACT, ID_AA64ISAR1_EL1_APA_SHIFT, 4, 0), 230 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_EL1_DPB_SHIFT, 4, 0), 231 ARM64_FTR_END, 232 }; 233 234 static const struct arm64_ftr_bits ftr_id_aa64isar2[] = { 235 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_HIGHER_SAFE, ID_AA64ISAR2_EL1_BC_SHIFT, 4, 0), 236 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_PTR_AUTH), 237 FTR_STRICT, FTR_EXACT, ID_AA64ISAR2_EL1_APA3_SHIFT, 4, 0), 238 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_PTR_AUTH), 239 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR2_EL1_GPA3_SHIFT, 4, 0), 240 ARM64_FTR_BITS(FTR_VISIBLE, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64ISAR2_EL1_RPRES_SHIFT, 4, 0), 241 ARM64_FTR_BITS(FTR_VISIBLE, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64ISAR2_EL1_WFxT_SHIFT, 4, 0), 242 ARM64_FTR_END, 243 }; 244 245 static const struct arm64_ftr_bits ftr_id_aa64pfr0[] = { 246 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64PFR0_CSV3_SHIFT, 4, 0), 247 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64PFR0_CSV2_SHIFT, 4, 0), 248 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR0_DIT_SHIFT, 4, 0), 249 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64PFR0_AMU_SHIFT, 4, 0), 250 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR0_MPAM_SHIFT, 4, 0), 251 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64PFR0_SEL2_SHIFT, 4, 0), 252 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), 253 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR0_SVE_SHIFT, 4, 0), 254 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR0_RAS_SHIFT, 4, 0), 255 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR0_GIC_SHIFT, 4, 0), 256 S_ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR0_ASIMD_SHIFT, 4, ID_AA64PFR0_ASIMD_NI), 257 S_ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR0_FP_SHIFT, 4, ID_AA64PFR0_FP_NI), 258 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64PFR0_EL3_SHIFT, 4, 0), 259 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64PFR0_EL2_SHIFT, 4, 0), 260 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64PFR0_EL1_SHIFT, 4, ID_AA64PFR0_ELx_64BIT_ONLY), 261 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64PFR0_EL0_SHIFT, 4, ID_AA64PFR0_ELx_64BIT_ONLY), 262 ARM64_FTR_END, 263 }; 264 265 static const struct arm64_ftr_bits ftr_id_aa64pfr1[] = { 266 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME), 267 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR1_SME_SHIFT, 4, 0), 268 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR1_MPAMFRAC_SHIFT, 4, 0), 269 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR1_RASFRAC_SHIFT, 4, 0), 270 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_MTE), 271 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR1_MTE_SHIFT, 4, ID_AA64PFR1_MTE_NI), 272 ARM64_FTR_BITS(FTR_VISIBLE, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64PFR1_SSBS_SHIFT, 4, ID_AA64PFR1_SSBS_PSTATE_NI), 273 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_BTI), 274 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR1_BT_SHIFT, 4, 0), 275 ARM64_FTR_END, 276 }; 277 278 static const struct arm64_ftr_bits ftr_id_aa64zfr0[] = { 279 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), 280 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_EL1_F64MM_SHIFT, 4, 0), 281 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), 282 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_EL1_F32MM_SHIFT, 4, 0), 283 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), 284 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_EL1_I8MM_SHIFT, 4, 0), 285 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), 286 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_EL1_SM4_SHIFT, 4, 0), 287 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), 288 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_EL1_SHA3_SHIFT, 4, 0), 289 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), 290 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_EL1_BF16_SHIFT, 4, 0), 291 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), 292 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_EL1_BitPerm_SHIFT, 4, 0), 293 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), 294 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_EL1_AES_SHIFT, 4, 0), 295 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), 296 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_EL1_SVEver_SHIFT, 4, 0), 297 ARM64_FTR_END, 298 }; 299 300 static const struct arm64_ftr_bits ftr_id_aa64smfr0[] = { 301 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME), 302 FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_FA64_SHIFT, 1, 0), 303 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME), 304 FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_I16I64_SHIFT, 4, 0), 305 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME), 306 FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_F64F64_SHIFT, 1, 0), 307 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME), 308 FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_I8I32_SHIFT, 4, 0), 309 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME), 310 FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_F16F32_SHIFT, 1, 0), 311 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME), 312 FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_B16F32_SHIFT, 1, 0), 313 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME), 314 FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_F32F32_SHIFT, 1, 0), 315 ARM64_FTR_END, 316 }; 317 318 static const struct arm64_ftr_bits ftr_id_aa64mmfr0[] = { 319 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_ECV_SHIFT, 4, 0), 320 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_FGT_SHIFT, 4, 0), 321 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_EXS_SHIFT, 4, 0), 322 /* 323 * Page size not being supported at Stage-2 is not fatal. You 324 * just give up KVM if PAGE_SIZE isn't supported there. Go fix 325 * your favourite nesting hypervisor. 326 * 327 * There is a small corner case where the hypervisor explicitly 328 * advertises a given granule size at Stage-2 (value 2) on some 329 * vCPUs, and uses the fallback to Stage-1 (value 0) for other 330 * vCPUs. Although this is not forbidden by the architecture, it 331 * indicates that the hypervisor is being silly (or buggy). 332 * 333 * We make no effort to cope with this and pretend that if these 334 * fields are inconsistent across vCPUs, then it isn't worth 335 * trying to bring KVM up. 336 */ 337 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_EXACT, ID_AA64MMFR0_TGRAN4_2_SHIFT, 4, 1), 338 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_EXACT, ID_AA64MMFR0_TGRAN64_2_SHIFT, 4, 1), 339 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_EXACT, ID_AA64MMFR0_TGRAN16_2_SHIFT, 4, 1), 340 /* 341 * We already refuse to boot CPUs that don't support our configured 342 * page size, so we can only detect mismatches for a page size other 343 * than the one we're currently using. Unfortunately, SoCs like this 344 * exist in the wild so, even though we don't like it, we'll have to go 345 * along with it and treat them as non-strict. 346 */ 347 S_ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_TGRAN4_SHIFT, 4, ID_AA64MMFR0_TGRAN4_NI), 348 S_ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_TGRAN64_SHIFT, 4, ID_AA64MMFR0_TGRAN64_NI), 349 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_TGRAN16_SHIFT, 4, ID_AA64MMFR0_TGRAN16_NI), 350 351 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_BIGENDEL0_SHIFT, 4, 0), 352 /* Linux shouldn't care about secure memory */ 353 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_SNSMEM_SHIFT, 4, 0), 354 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_BIGENDEL_SHIFT, 4, 0), 355 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_ASID_SHIFT, 4, 0), 356 /* 357 * Differing PARange is fine as long as all peripherals and memory are mapped 358 * within the minimum PARange of all CPUs 359 */ 360 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_PARANGE_SHIFT, 4, 0), 361 ARM64_FTR_END, 362 }; 363 364 static const struct arm64_ftr_bits ftr_id_aa64mmfr1[] = { 365 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_TIDCP1_SHIFT, 4, 0), 366 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_AFP_SHIFT, 4, 0), 367 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_ETS_SHIFT, 4, 0), 368 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_TWED_SHIFT, 4, 0), 369 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_XNX_SHIFT, 4, 0), 370 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_HIGHER_SAFE, ID_AA64MMFR1_SPECSEI_SHIFT, 4, 0), 371 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_PAN_SHIFT, 4, 0), 372 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_LOR_SHIFT, 4, 0), 373 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_HPD_SHIFT, 4, 0), 374 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_VHE_SHIFT, 4, 0), 375 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_VMIDBITS_SHIFT, 4, 0), 376 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_HADBS_SHIFT, 4, 0), 377 ARM64_FTR_END, 378 }; 379 380 static const struct arm64_ftr_bits ftr_id_aa64mmfr2[] = { 381 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_E0PD_SHIFT, 4, 0), 382 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_EVT_SHIFT, 4, 0), 383 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_BBM_SHIFT, 4, 0), 384 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_TTL_SHIFT, 4, 0), 385 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_FWB_SHIFT, 4, 0), 386 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_IDS_SHIFT, 4, 0), 387 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_AT_SHIFT, 4, 0), 388 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_ST_SHIFT, 4, 0), 389 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_NV_SHIFT, 4, 0), 390 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_CCIDX_SHIFT, 4, 0), 391 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_LVA_SHIFT, 4, 0), 392 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_IESB_SHIFT, 4, 0), 393 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_LSM_SHIFT, 4, 0), 394 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_UAO_SHIFT, 4, 0), 395 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_CNP_SHIFT, 4, 0), 396 ARM64_FTR_END, 397 }; 398 399 static const struct arm64_ftr_bits ftr_ctr[] = { 400 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_EXACT, 31, 1, 1), /* RES1 */ 401 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, CTR_EL0_DIC_SHIFT, 1, 1), 402 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, CTR_EL0_IDC_SHIFT, 1, 1), 403 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_HIGHER_OR_ZERO_SAFE, CTR_EL0_CWG_SHIFT, 4, 0), 404 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_HIGHER_OR_ZERO_SAFE, CTR_EL0_ERG_SHIFT, 4, 0), 405 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, CTR_EL0_DminLine_SHIFT, 4, 1), 406 /* 407 * Linux can handle differing I-cache policies. Userspace JITs will 408 * make use of *minLine. 409 * If we have differing I-cache policies, report it as the weakest - VIPT. 410 */ 411 ARM64_FTR_BITS(FTR_VISIBLE, FTR_NONSTRICT, FTR_EXACT, CTR_EL0_L1Ip_SHIFT, 2, CTR_EL0_L1Ip_VIPT), /* L1Ip */ 412 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, CTR_EL0_IminLine_SHIFT, 4, 0), 413 ARM64_FTR_END, 414 }; 415 416 static struct arm64_ftr_override __ro_after_init no_override = { }; 417 418 struct arm64_ftr_reg arm64_ftr_reg_ctrel0 = { 419 .name = "SYS_CTR_EL0", 420 .ftr_bits = ftr_ctr, 421 .override = &no_override, 422 }; 423 424 static const struct arm64_ftr_bits ftr_id_mmfr0[] = { 425 S_ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR0_INNERSHR_SHIFT, 4, 0xf), 426 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR0_FCSE_SHIFT, 4, 0), 427 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_MMFR0_AUXREG_SHIFT, 4, 0), 428 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR0_TCM_SHIFT, 4, 0), 429 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR0_SHARELVL_SHIFT, 4, 0), 430 S_ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR0_OUTERSHR_SHIFT, 4, 0xf), 431 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR0_PMSA_SHIFT, 4, 0), 432 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR0_VMSA_SHIFT, 4, 0), 433 ARM64_FTR_END, 434 }; 435 436 static const struct arm64_ftr_bits ftr_id_aa64dfr0[] = { 437 S_ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64DFR0_DOUBLELOCK_SHIFT, 4, 0), 438 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64DFR0_PMSVER_SHIFT, 4, 0), 439 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64DFR0_CTX_CMPS_SHIFT, 4, 0), 440 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64DFR0_WRPS_SHIFT, 4, 0), 441 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64DFR0_BRPS_SHIFT, 4, 0), 442 /* 443 * We can instantiate multiple PMU instances with different levels 444 * of support. 445 */ 446 S_ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_EXACT, ID_AA64DFR0_PMUVER_SHIFT, 4, 0), 447 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_EXACT, ID_AA64DFR0_DEBUGVER_SHIFT, 4, 0x6), 448 ARM64_FTR_END, 449 }; 450 451 static const struct arm64_ftr_bits ftr_mvfr2[] = { 452 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, MVFR2_FPMISC_SHIFT, 4, 0), 453 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, MVFR2_SIMDMISC_SHIFT, 4, 0), 454 ARM64_FTR_END, 455 }; 456 457 static const struct arm64_ftr_bits ftr_dczid[] = { 458 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_EXACT, DCZID_EL0_DZP_SHIFT, 1, 1), 459 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, DCZID_EL0_BS_SHIFT, 4, 0), 460 ARM64_FTR_END, 461 }; 462 463 static const struct arm64_ftr_bits ftr_gmid[] = { 464 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, GMID_EL1_BS_SHIFT, 4, 0), 465 ARM64_FTR_END, 466 }; 467 468 static const struct arm64_ftr_bits ftr_id_isar0[] = { 469 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR0_DIVIDE_SHIFT, 4, 0), 470 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR0_DEBUG_SHIFT, 4, 0), 471 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR0_COPROC_SHIFT, 4, 0), 472 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR0_CMPBRANCH_SHIFT, 4, 0), 473 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR0_BITFIELD_SHIFT, 4, 0), 474 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR0_BITCOUNT_SHIFT, 4, 0), 475 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR0_SWAP_SHIFT, 4, 0), 476 ARM64_FTR_END, 477 }; 478 479 static const struct arm64_ftr_bits ftr_id_isar5[] = { 480 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR5_RDM_SHIFT, 4, 0), 481 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR5_CRC32_SHIFT, 4, 0), 482 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR5_SHA2_SHIFT, 4, 0), 483 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR5_SHA1_SHIFT, 4, 0), 484 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR5_AES_SHIFT, 4, 0), 485 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR5_SEVL_SHIFT, 4, 0), 486 ARM64_FTR_END, 487 }; 488 489 static const struct arm64_ftr_bits ftr_id_mmfr4[] = { 490 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR4_EVT_SHIFT, 4, 0), 491 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR4_CCIDX_SHIFT, 4, 0), 492 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR4_LSM_SHIFT, 4, 0), 493 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR4_HPDS_SHIFT, 4, 0), 494 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR4_CNP_SHIFT, 4, 0), 495 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR4_XNX_SHIFT, 4, 0), 496 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR4_AC2_SHIFT, 4, 0), 497 498 /* 499 * SpecSEI = 1 indicates that the PE might generate an SError on an 500 * external abort on speculative read. It is safe to assume that an 501 * SError might be generated than it will not be. Hence it has been 502 * classified as FTR_HIGHER_SAFE. 503 */ 504 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_HIGHER_SAFE, ID_MMFR4_SPECSEI_SHIFT, 4, 0), 505 ARM64_FTR_END, 506 }; 507 508 static const struct arm64_ftr_bits ftr_id_isar4[] = { 509 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR4_SWP_FRAC_SHIFT, 4, 0), 510 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR4_PSR_M_SHIFT, 4, 0), 511 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR4_SYNCH_PRIM_FRAC_SHIFT, 4, 0), 512 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR4_BARRIER_SHIFT, 4, 0), 513 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR4_SMC_SHIFT, 4, 0), 514 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR4_WRITEBACK_SHIFT, 4, 0), 515 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR4_WITHSHIFTS_SHIFT, 4, 0), 516 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR4_UNPRIV_SHIFT, 4, 0), 517 ARM64_FTR_END, 518 }; 519 520 static const struct arm64_ftr_bits ftr_id_mmfr5[] = { 521 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR5_ETS_SHIFT, 4, 0), 522 ARM64_FTR_END, 523 }; 524 525 static const struct arm64_ftr_bits ftr_id_isar6[] = { 526 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR6_I8MM_SHIFT, 4, 0), 527 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR6_BF16_SHIFT, 4, 0), 528 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR6_SPECRES_SHIFT, 4, 0), 529 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR6_SB_SHIFT, 4, 0), 530 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR6_FHM_SHIFT, 4, 0), 531 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR6_DP_SHIFT, 4, 0), 532 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR6_JSCVT_SHIFT, 4, 0), 533 ARM64_FTR_END, 534 }; 535 536 static const struct arm64_ftr_bits ftr_id_pfr0[] = { 537 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR0_DIT_SHIFT, 4, 0), 538 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_PFR0_CSV2_SHIFT, 4, 0), 539 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR0_STATE3_SHIFT, 4, 0), 540 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR0_STATE2_SHIFT, 4, 0), 541 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR0_STATE1_SHIFT, 4, 0), 542 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR0_STATE0_SHIFT, 4, 0), 543 ARM64_FTR_END, 544 }; 545 546 static const struct arm64_ftr_bits ftr_id_pfr1[] = { 547 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR1_GIC_SHIFT, 4, 0), 548 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR1_VIRT_FRAC_SHIFT, 4, 0), 549 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR1_SEC_FRAC_SHIFT, 4, 0), 550 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR1_GENTIMER_SHIFT, 4, 0), 551 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR1_VIRTUALIZATION_SHIFT, 4, 0), 552 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR1_MPROGMOD_SHIFT, 4, 0), 553 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR1_SECURITY_SHIFT, 4, 0), 554 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR1_PROGMOD_SHIFT, 4, 0), 555 ARM64_FTR_END, 556 }; 557 558 static const struct arm64_ftr_bits ftr_id_pfr2[] = { 559 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_PFR2_SSBS_SHIFT, 4, 0), 560 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_PFR2_CSV3_SHIFT, 4, 0), 561 ARM64_FTR_END, 562 }; 563 564 static const struct arm64_ftr_bits ftr_id_dfr0[] = { 565 /* [31:28] TraceFilt */ 566 S_ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_EXACT, ID_DFR0_PERFMON_SHIFT, 4, 0), 567 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_DFR0_MPROFDBG_SHIFT, 4, 0), 568 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_DFR0_MMAPTRC_SHIFT, 4, 0), 569 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_DFR0_COPTRC_SHIFT, 4, 0), 570 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_DFR0_MMAPDBG_SHIFT, 4, 0), 571 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_DFR0_COPSDBG_SHIFT, 4, 0), 572 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_DFR0_COPDBG_SHIFT, 4, 0), 573 ARM64_FTR_END, 574 }; 575 576 static const struct arm64_ftr_bits ftr_id_dfr1[] = { 577 S_ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_DFR1_MTPMU_SHIFT, 4, 0), 578 ARM64_FTR_END, 579 }; 580 581 static const struct arm64_ftr_bits ftr_zcr[] = { 582 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, 583 ZCR_ELx_LEN_SHIFT, ZCR_ELx_LEN_WIDTH, 0), /* LEN */ 584 ARM64_FTR_END, 585 }; 586 587 static const struct arm64_ftr_bits ftr_smcr[] = { 588 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, 589 SMCR_ELx_LEN_SHIFT, SMCR_ELx_LEN_WIDTH, 0), /* LEN */ 590 ARM64_FTR_END, 591 }; 592 593 /* 594 * Common ftr bits for a 32bit register with all hidden, strict 595 * attributes, with 4bit feature fields and a default safe value of 596 * 0. Covers the following 32bit registers: 597 * id_isar[1-4], id_mmfr[1-3], id_pfr1, mvfr[0-1] 598 */ 599 static const struct arm64_ftr_bits ftr_generic_32bits[] = { 600 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 28, 4, 0), 601 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 24, 4, 0), 602 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 20, 4, 0), 603 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 16, 4, 0), 604 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 12, 4, 0), 605 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 8, 4, 0), 606 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 4, 4, 0), 607 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 0, 4, 0), 608 ARM64_FTR_END, 609 }; 610 611 /* Table for a single 32bit feature value */ 612 static const struct arm64_ftr_bits ftr_single32[] = { 613 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_EXACT, 0, 32, 0), 614 ARM64_FTR_END, 615 }; 616 617 static const struct arm64_ftr_bits ftr_raz[] = { 618 ARM64_FTR_END, 619 }; 620 621 #define __ARM64_FTR_REG_OVERRIDE(id_str, id, table, ovr) { \ 622 .sys_id = id, \ 623 .reg = &(struct arm64_ftr_reg){ \ 624 .name = id_str, \ 625 .override = (ovr), \ 626 .ftr_bits = &((table)[0]), \ 627 }} 628 629 #define ARM64_FTR_REG_OVERRIDE(id, table, ovr) \ 630 __ARM64_FTR_REG_OVERRIDE(#id, id, table, ovr) 631 632 #define ARM64_FTR_REG(id, table) \ 633 __ARM64_FTR_REG_OVERRIDE(#id, id, table, &no_override) 634 635 struct arm64_ftr_override __ro_after_init id_aa64mmfr1_override; 636 struct arm64_ftr_override __ro_after_init id_aa64pfr0_override; 637 struct arm64_ftr_override __ro_after_init id_aa64pfr1_override; 638 struct arm64_ftr_override __ro_after_init id_aa64zfr0_override; 639 struct arm64_ftr_override __ro_after_init id_aa64smfr0_override; 640 struct arm64_ftr_override __ro_after_init id_aa64isar1_override; 641 struct arm64_ftr_override __ro_after_init id_aa64isar2_override; 642 643 static const struct __ftr_reg_entry { 644 u32 sys_id; 645 struct arm64_ftr_reg *reg; 646 } arm64_ftr_regs[] = { 647 648 /* Op1 = 0, CRn = 0, CRm = 1 */ 649 ARM64_FTR_REG(SYS_ID_PFR0_EL1, ftr_id_pfr0), 650 ARM64_FTR_REG(SYS_ID_PFR1_EL1, ftr_id_pfr1), 651 ARM64_FTR_REG(SYS_ID_DFR0_EL1, ftr_id_dfr0), 652 ARM64_FTR_REG(SYS_ID_MMFR0_EL1, ftr_id_mmfr0), 653 ARM64_FTR_REG(SYS_ID_MMFR1_EL1, ftr_generic_32bits), 654 ARM64_FTR_REG(SYS_ID_MMFR2_EL1, ftr_generic_32bits), 655 ARM64_FTR_REG(SYS_ID_MMFR3_EL1, ftr_generic_32bits), 656 657 /* Op1 = 0, CRn = 0, CRm = 2 */ 658 ARM64_FTR_REG(SYS_ID_ISAR0_EL1, ftr_id_isar0), 659 ARM64_FTR_REG(SYS_ID_ISAR1_EL1, ftr_generic_32bits), 660 ARM64_FTR_REG(SYS_ID_ISAR2_EL1, ftr_generic_32bits), 661 ARM64_FTR_REG(SYS_ID_ISAR3_EL1, ftr_generic_32bits), 662 ARM64_FTR_REG(SYS_ID_ISAR4_EL1, ftr_id_isar4), 663 ARM64_FTR_REG(SYS_ID_ISAR5_EL1, ftr_id_isar5), 664 ARM64_FTR_REG(SYS_ID_MMFR4_EL1, ftr_id_mmfr4), 665 ARM64_FTR_REG(SYS_ID_ISAR6_EL1, ftr_id_isar6), 666 667 /* Op1 = 0, CRn = 0, CRm = 3 */ 668 ARM64_FTR_REG(SYS_MVFR0_EL1, ftr_generic_32bits), 669 ARM64_FTR_REG(SYS_MVFR1_EL1, ftr_generic_32bits), 670 ARM64_FTR_REG(SYS_MVFR2_EL1, ftr_mvfr2), 671 ARM64_FTR_REG(SYS_ID_PFR2_EL1, ftr_id_pfr2), 672 ARM64_FTR_REG(SYS_ID_DFR1_EL1, ftr_id_dfr1), 673 ARM64_FTR_REG(SYS_ID_MMFR5_EL1, ftr_id_mmfr5), 674 675 /* Op1 = 0, CRn = 0, CRm = 4 */ 676 ARM64_FTR_REG_OVERRIDE(SYS_ID_AA64PFR0_EL1, ftr_id_aa64pfr0, 677 &id_aa64pfr0_override), 678 ARM64_FTR_REG_OVERRIDE(SYS_ID_AA64PFR1_EL1, ftr_id_aa64pfr1, 679 &id_aa64pfr1_override), 680 ARM64_FTR_REG_OVERRIDE(SYS_ID_AA64ZFR0_EL1, ftr_id_aa64zfr0, 681 &id_aa64zfr0_override), 682 ARM64_FTR_REG_OVERRIDE(SYS_ID_AA64SMFR0_EL1, ftr_id_aa64smfr0, 683 &id_aa64smfr0_override), 684 685 /* Op1 = 0, CRn = 0, CRm = 5 */ 686 ARM64_FTR_REG(SYS_ID_AA64DFR0_EL1, ftr_id_aa64dfr0), 687 ARM64_FTR_REG(SYS_ID_AA64DFR1_EL1, ftr_raz), 688 689 /* Op1 = 0, CRn = 0, CRm = 6 */ 690 ARM64_FTR_REG(SYS_ID_AA64ISAR0_EL1, ftr_id_aa64isar0), 691 ARM64_FTR_REG_OVERRIDE(SYS_ID_AA64ISAR1_EL1, ftr_id_aa64isar1, 692 &id_aa64isar1_override), 693 ARM64_FTR_REG_OVERRIDE(SYS_ID_AA64ISAR2_EL1, ftr_id_aa64isar2, 694 &id_aa64isar2_override), 695 696 /* Op1 = 0, CRn = 0, CRm = 7 */ 697 ARM64_FTR_REG(SYS_ID_AA64MMFR0_EL1, ftr_id_aa64mmfr0), 698 ARM64_FTR_REG_OVERRIDE(SYS_ID_AA64MMFR1_EL1, ftr_id_aa64mmfr1, 699 &id_aa64mmfr1_override), 700 ARM64_FTR_REG(SYS_ID_AA64MMFR2_EL1, ftr_id_aa64mmfr2), 701 702 /* Op1 = 0, CRn = 1, CRm = 2 */ 703 ARM64_FTR_REG(SYS_ZCR_EL1, ftr_zcr), 704 ARM64_FTR_REG(SYS_SMCR_EL1, ftr_smcr), 705 706 /* Op1 = 1, CRn = 0, CRm = 0 */ 707 ARM64_FTR_REG(SYS_GMID_EL1, ftr_gmid), 708 709 /* Op1 = 3, CRn = 0, CRm = 0 */ 710 { SYS_CTR_EL0, &arm64_ftr_reg_ctrel0 }, 711 ARM64_FTR_REG(SYS_DCZID_EL0, ftr_dczid), 712 713 /* Op1 = 3, CRn = 14, CRm = 0 */ 714 ARM64_FTR_REG(SYS_CNTFRQ_EL0, ftr_single32), 715 }; 716 717 static int search_cmp_ftr_reg(const void *id, const void *regp) 718 { 719 return (int)(unsigned long)id - (int)((const struct __ftr_reg_entry *)regp)->sys_id; 720 } 721 722 /* 723 * get_arm64_ftr_reg_nowarn - Looks up a feature register entry using 724 * its sys_reg() encoding. With the array arm64_ftr_regs sorted in the 725 * ascending order of sys_id, we use binary search to find a matching 726 * entry. 727 * 728 * returns - Upon success, matching ftr_reg entry for id. 729 * - NULL on failure. It is upto the caller to decide 730 * the impact of a failure. 731 */ 732 static struct arm64_ftr_reg *get_arm64_ftr_reg_nowarn(u32 sys_id) 733 { 734 const struct __ftr_reg_entry *ret; 735 736 ret = bsearch((const void *)(unsigned long)sys_id, 737 arm64_ftr_regs, 738 ARRAY_SIZE(arm64_ftr_regs), 739 sizeof(arm64_ftr_regs[0]), 740 search_cmp_ftr_reg); 741 if (ret) 742 return ret->reg; 743 return NULL; 744 } 745 746 /* 747 * get_arm64_ftr_reg - Looks up a feature register entry using 748 * its sys_reg() encoding. This calls get_arm64_ftr_reg_nowarn(). 749 * 750 * returns - Upon success, matching ftr_reg entry for id. 751 * - NULL on failure but with an WARN_ON(). 752 */ 753 static struct arm64_ftr_reg *get_arm64_ftr_reg(u32 sys_id) 754 { 755 struct arm64_ftr_reg *reg; 756 757 reg = get_arm64_ftr_reg_nowarn(sys_id); 758 759 /* 760 * Requesting a non-existent register search is an error. Warn 761 * and let the caller handle it. 762 */ 763 WARN_ON(!reg); 764 return reg; 765 } 766 767 static u64 arm64_ftr_set_value(const struct arm64_ftr_bits *ftrp, s64 reg, 768 s64 ftr_val) 769 { 770 u64 mask = arm64_ftr_mask(ftrp); 771 772 reg &= ~mask; 773 reg |= (ftr_val << ftrp->shift) & mask; 774 return reg; 775 } 776 777 static s64 arm64_ftr_safe_value(const struct arm64_ftr_bits *ftrp, s64 new, 778 s64 cur) 779 { 780 s64 ret = 0; 781 782 switch (ftrp->type) { 783 case FTR_EXACT: 784 ret = ftrp->safe_val; 785 break; 786 case FTR_LOWER_SAFE: 787 ret = min(new, cur); 788 break; 789 case FTR_HIGHER_OR_ZERO_SAFE: 790 if (!cur || !new) 791 break; 792 fallthrough; 793 case FTR_HIGHER_SAFE: 794 ret = max(new, cur); 795 break; 796 default: 797 BUG(); 798 } 799 800 return ret; 801 } 802 803 static void __init sort_ftr_regs(void) 804 { 805 unsigned int i; 806 807 for (i = 0; i < ARRAY_SIZE(arm64_ftr_regs); i++) { 808 const struct arm64_ftr_reg *ftr_reg = arm64_ftr_regs[i].reg; 809 const struct arm64_ftr_bits *ftr_bits = ftr_reg->ftr_bits; 810 unsigned int j = 0; 811 812 /* 813 * Features here must be sorted in descending order with respect 814 * to their shift values and should not overlap with each other. 815 */ 816 for (; ftr_bits->width != 0; ftr_bits++, j++) { 817 unsigned int width = ftr_reg->ftr_bits[j].width; 818 unsigned int shift = ftr_reg->ftr_bits[j].shift; 819 unsigned int prev_shift; 820 821 WARN((shift + width) > 64, 822 "%s has invalid feature at shift %d\n", 823 ftr_reg->name, shift); 824 825 /* 826 * Skip the first feature. There is nothing to 827 * compare against for now. 828 */ 829 if (j == 0) 830 continue; 831 832 prev_shift = ftr_reg->ftr_bits[j - 1].shift; 833 WARN((shift + width) > prev_shift, 834 "%s has feature overlap at shift %d\n", 835 ftr_reg->name, shift); 836 } 837 838 /* 839 * Skip the first register. There is nothing to 840 * compare against for now. 841 */ 842 if (i == 0) 843 continue; 844 /* 845 * Registers here must be sorted in ascending order with respect 846 * to sys_id for subsequent binary search in get_arm64_ftr_reg() 847 * to work correctly. 848 */ 849 BUG_ON(arm64_ftr_regs[i].sys_id <= arm64_ftr_regs[i - 1].sys_id); 850 } 851 } 852 853 /* 854 * Initialise the CPU feature register from Boot CPU values. 855 * Also initiliases the strict_mask for the register. 856 * Any bits that are not covered by an arm64_ftr_bits entry are considered 857 * RES0 for the system-wide value, and must strictly match. 858 */ 859 static void init_cpu_ftr_reg(u32 sys_reg, u64 new) 860 { 861 u64 val = 0; 862 u64 strict_mask = ~0x0ULL; 863 u64 user_mask = 0; 864 u64 valid_mask = 0; 865 866 const struct arm64_ftr_bits *ftrp; 867 struct arm64_ftr_reg *reg = get_arm64_ftr_reg(sys_reg); 868 869 if (!reg) 870 return; 871 872 for (ftrp = reg->ftr_bits; ftrp->width; ftrp++) { 873 u64 ftr_mask = arm64_ftr_mask(ftrp); 874 s64 ftr_new = arm64_ftr_value(ftrp, new); 875 s64 ftr_ovr = arm64_ftr_value(ftrp, reg->override->val); 876 877 if ((ftr_mask & reg->override->mask) == ftr_mask) { 878 s64 tmp = arm64_ftr_safe_value(ftrp, ftr_ovr, ftr_new); 879 char *str = NULL; 880 881 if (ftr_ovr != tmp) { 882 /* Unsafe, remove the override */ 883 reg->override->mask &= ~ftr_mask; 884 reg->override->val &= ~ftr_mask; 885 tmp = ftr_ovr; 886 str = "ignoring override"; 887 } else if (ftr_new != tmp) { 888 /* Override was valid */ 889 ftr_new = tmp; 890 str = "forced"; 891 } else if (ftr_ovr == tmp) { 892 /* Override was the safe value */ 893 str = "already set"; 894 } 895 896 if (str) 897 pr_warn("%s[%d:%d]: %s to %llx\n", 898 reg->name, 899 ftrp->shift + ftrp->width - 1, 900 ftrp->shift, str, tmp); 901 } else if ((ftr_mask & reg->override->val) == ftr_mask) { 902 reg->override->val &= ~ftr_mask; 903 pr_warn("%s[%d:%d]: impossible override, ignored\n", 904 reg->name, 905 ftrp->shift + ftrp->width - 1, 906 ftrp->shift); 907 } 908 909 val = arm64_ftr_set_value(ftrp, val, ftr_new); 910 911 valid_mask |= ftr_mask; 912 if (!ftrp->strict) 913 strict_mask &= ~ftr_mask; 914 if (ftrp->visible) 915 user_mask |= ftr_mask; 916 else 917 reg->user_val = arm64_ftr_set_value(ftrp, 918 reg->user_val, 919 ftrp->safe_val); 920 } 921 922 val &= valid_mask; 923 924 reg->sys_val = val; 925 reg->strict_mask = strict_mask; 926 reg->user_mask = user_mask; 927 } 928 929 extern const struct arm64_cpu_capabilities arm64_errata[]; 930 static const struct arm64_cpu_capabilities arm64_features[]; 931 932 static void __init 933 init_cpu_hwcaps_indirect_list_from_array(const struct arm64_cpu_capabilities *caps) 934 { 935 for (; caps->matches; caps++) { 936 if (WARN(caps->capability >= ARM64_NCAPS, 937 "Invalid capability %d\n", caps->capability)) 938 continue; 939 if (WARN(cpu_hwcaps_ptrs[caps->capability], 940 "Duplicate entry for capability %d\n", 941 caps->capability)) 942 continue; 943 cpu_hwcaps_ptrs[caps->capability] = caps; 944 } 945 } 946 947 static void __init init_cpu_hwcaps_indirect_list(void) 948 { 949 init_cpu_hwcaps_indirect_list_from_array(arm64_features); 950 init_cpu_hwcaps_indirect_list_from_array(arm64_errata); 951 } 952 953 static void __init setup_boot_cpu_capabilities(void); 954 955 static void init_32bit_cpu_features(struct cpuinfo_32bit *info) 956 { 957 init_cpu_ftr_reg(SYS_ID_DFR0_EL1, info->reg_id_dfr0); 958 init_cpu_ftr_reg(SYS_ID_DFR1_EL1, info->reg_id_dfr1); 959 init_cpu_ftr_reg(SYS_ID_ISAR0_EL1, info->reg_id_isar0); 960 init_cpu_ftr_reg(SYS_ID_ISAR1_EL1, info->reg_id_isar1); 961 init_cpu_ftr_reg(SYS_ID_ISAR2_EL1, info->reg_id_isar2); 962 init_cpu_ftr_reg(SYS_ID_ISAR3_EL1, info->reg_id_isar3); 963 init_cpu_ftr_reg(SYS_ID_ISAR4_EL1, info->reg_id_isar4); 964 init_cpu_ftr_reg(SYS_ID_ISAR5_EL1, info->reg_id_isar5); 965 init_cpu_ftr_reg(SYS_ID_ISAR6_EL1, info->reg_id_isar6); 966 init_cpu_ftr_reg(SYS_ID_MMFR0_EL1, info->reg_id_mmfr0); 967 init_cpu_ftr_reg(SYS_ID_MMFR1_EL1, info->reg_id_mmfr1); 968 init_cpu_ftr_reg(SYS_ID_MMFR2_EL1, info->reg_id_mmfr2); 969 init_cpu_ftr_reg(SYS_ID_MMFR3_EL1, info->reg_id_mmfr3); 970 init_cpu_ftr_reg(SYS_ID_MMFR4_EL1, info->reg_id_mmfr4); 971 init_cpu_ftr_reg(SYS_ID_MMFR5_EL1, info->reg_id_mmfr5); 972 init_cpu_ftr_reg(SYS_ID_PFR0_EL1, info->reg_id_pfr0); 973 init_cpu_ftr_reg(SYS_ID_PFR1_EL1, info->reg_id_pfr1); 974 init_cpu_ftr_reg(SYS_ID_PFR2_EL1, info->reg_id_pfr2); 975 init_cpu_ftr_reg(SYS_MVFR0_EL1, info->reg_mvfr0); 976 init_cpu_ftr_reg(SYS_MVFR1_EL1, info->reg_mvfr1); 977 init_cpu_ftr_reg(SYS_MVFR2_EL1, info->reg_mvfr2); 978 } 979 980 void __init init_cpu_features(struct cpuinfo_arm64 *info) 981 { 982 /* Before we start using the tables, make sure it is sorted */ 983 sort_ftr_regs(); 984 985 init_cpu_ftr_reg(SYS_CTR_EL0, info->reg_ctr); 986 init_cpu_ftr_reg(SYS_DCZID_EL0, info->reg_dczid); 987 init_cpu_ftr_reg(SYS_CNTFRQ_EL0, info->reg_cntfrq); 988 init_cpu_ftr_reg(SYS_ID_AA64DFR0_EL1, info->reg_id_aa64dfr0); 989 init_cpu_ftr_reg(SYS_ID_AA64DFR1_EL1, info->reg_id_aa64dfr1); 990 init_cpu_ftr_reg(SYS_ID_AA64ISAR0_EL1, info->reg_id_aa64isar0); 991 init_cpu_ftr_reg(SYS_ID_AA64ISAR1_EL1, info->reg_id_aa64isar1); 992 init_cpu_ftr_reg(SYS_ID_AA64ISAR2_EL1, info->reg_id_aa64isar2); 993 init_cpu_ftr_reg(SYS_ID_AA64MMFR0_EL1, info->reg_id_aa64mmfr0); 994 init_cpu_ftr_reg(SYS_ID_AA64MMFR1_EL1, info->reg_id_aa64mmfr1); 995 init_cpu_ftr_reg(SYS_ID_AA64MMFR2_EL1, info->reg_id_aa64mmfr2); 996 init_cpu_ftr_reg(SYS_ID_AA64PFR0_EL1, info->reg_id_aa64pfr0); 997 init_cpu_ftr_reg(SYS_ID_AA64PFR1_EL1, info->reg_id_aa64pfr1); 998 init_cpu_ftr_reg(SYS_ID_AA64ZFR0_EL1, info->reg_id_aa64zfr0); 999 init_cpu_ftr_reg(SYS_ID_AA64SMFR0_EL1, info->reg_id_aa64smfr0); 1000 1001 if (id_aa64pfr0_32bit_el0(info->reg_id_aa64pfr0)) 1002 init_32bit_cpu_features(&info->aarch32); 1003 1004 if (IS_ENABLED(CONFIG_ARM64_SVE) && 1005 id_aa64pfr0_sve(read_sanitised_ftr_reg(SYS_ID_AA64PFR0_EL1))) { 1006 info->reg_zcr = read_zcr_features(); 1007 init_cpu_ftr_reg(SYS_ZCR_EL1, info->reg_zcr); 1008 vec_init_vq_map(ARM64_VEC_SVE); 1009 } 1010 1011 if (IS_ENABLED(CONFIG_ARM64_SME) && 1012 id_aa64pfr1_sme(read_sanitised_ftr_reg(SYS_ID_AA64PFR1_EL1))) { 1013 info->reg_smcr = read_smcr_features(); 1014 /* 1015 * We mask out SMPS since even if the hardware 1016 * supports priorities the kernel does not at present 1017 * and we block access to them. 1018 */ 1019 info->reg_smidr = read_cpuid(SMIDR_EL1) & ~SMIDR_EL1_SMPS; 1020 init_cpu_ftr_reg(SYS_SMCR_EL1, info->reg_smcr); 1021 vec_init_vq_map(ARM64_VEC_SME); 1022 } 1023 1024 if (id_aa64pfr1_mte(info->reg_id_aa64pfr1)) 1025 init_cpu_ftr_reg(SYS_GMID_EL1, info->reg_gmid); 1026 1027 /* 1028 * Initialize the indirect array of CPU hwcaps capabilities pointers 1029 * before we handle the boot CPU below. 1030 */ 1031 init_cpu_hwcaps_indirect_list(); 1032 1033 /* 1034 * Detect and enable early CPU capabilities based on the boot CPU, 1035 * after we have initialised the CPU feature infrastructure. 1036 */ 1037 setup_boot_cpu_capabilities(); 1038 } 1039 1040 static void update_cpu_ftr_reg(struct arm64_ftr_reg *reg, u64 new) 1041 { 1042 const struct arm64_ftr_bits *ftrp; 1043 1044 for (ftrp = reg->ftr_bits; ftrp->width; ftrp++) { 1045 s64 ftr_cur = arm64_ftr_value(ftrp, reg->sys_val); 1046 s64 ftr_new = arm64_ftr_value(ftrp, new); 1047 1048 if (ftr_cur == ftr_new) 1049 continue; 1050 /* Find a safe value */ 1051 ftr_new = arm64_ftr_safe_value(ftrp, ftr_new, ftr_cur); 1052 reg->sys_val = arm64_ftr_set_value(ftrp, reg->sys_val, ftr_new); 1053 } 1054 1055 } 1056 1057 static int check_update_ftr_reg(u32 sys_id, int cpu, u64 val, u64 boot) 1058 { 1059 struct arm64_ftr_reg *regp = get_arm64_ftr_reg(sys_id); 1060 1061 if (!regp) 1062 return 0; 1063 1064 update_cpu_ftr_reg(regp, val); 1065 if ((boot & regp->strict_mask) == (val & regp->strict_mask)) 1066 return 0; 1067 pr_warn("SANITY CHECK: Unexpected variation in %s. Boot CPU: %#016llx, CPU%d: %#016llx\n", 1068 regp->name, boot, cpu, val); 1069 return 1; 1070 } 1071 1072 static void relax_cpu_ftr_reg(u32 sys_id, int field) 1073 { 1074 const struct arm64_ftr_bits *ftrp; 1075 struct arm64_ftr_reg *regp = get_arm64_ftr_reg(sys_id); 1076 1077 if (!regp) 1078 return; 1079 1080 for (ftrp = regp->ftr_bits; ftrp->width; ftrp++) { 1081 if (ftrp->shift == field) { 1082 regp->strict_mask &= ~arm64_ftr_mask(ftrp); 1083 break; 1084 } 1085 } 1086 1087 /* Bogus field? */ 1088 WARN_ON(!ftrp->width); 1089 } 1090 1091 static void lazy_init_32bit_cpu_features(struct cpuinfo_arm64 *info, 1092 struct cpuinfo_arm64 *boot) 1093 { 1094 static bool boot_cpu_32bit_regs_overridden = false; 1095 1096 if (!allow_mismatched_32bit_el0 || boot_cpu_32bit_regs_overridden) 1097 return; 1098 1099 if (id_aa64pfr0_32bit_el0(boot->reg_id_aa64pfr0)) 1100 return; 1101 1102 boot->aarch32 = info->aarch32; 1103 init_32bit_cpu_features(&boot->aarch32); 1104 boot_cpu_32bit_regs_overridden = true; 1105 } 1106 1107 static int update_32bit_cpu_features(int cpu, struct cpuinfo_32bit *info, 1108 struct cpuinfo_32bit *boot) 1109 { 1110 int taint = 0; 1111 u64 pfr0 = read_sanitised_ftr_reg(SYS_ID_AA64PFR0_EL1); 1112 1113 /* 1114 * If we don't have AArch32 at EL1, then relax the strictness of 1115 * EL1-dependent register fields to avoid spurious sanity check fails. 1116 */ 1117 if (!id_aa64pfr0_32bit_el1(pfr0)) { 1118 relax_cpu_ftr_reg(SYS_ID_ISAR4_EL1, ID_ISAR4_SMC_SHIFT); 1119 relax_cpu_ftr_reg(SYS_ID_PFR1_EL1, ID_PFR1_VIRT_FRAC_SHIFT); 1120 relax_cpu_ftr_reg(SYS_ID_PFR1_EL1, ID_PFR1_SEC_FRAC_SHIFT); 1121 relax_cpu_ftr_reg(SYS_ID_PFR1_EL1, ID_PFR1_VIRTUALIZATION_SHIFT); 1122 relax_cpu_ftr_reg(SYS_ID_PFR1_EL1, ID_PFR1_SECURITY_SHIFT); 1123 relax_cpu_ftr_reg(SYS_ID_PFR1_EL1, ID_PFR1_PROGMOD_SHIFT); 1124 } 1125 1126 taint |= check_update_ftr_reg(SYS_ID_DFR0_EL1, cpu, 1127 info->reg_id_dfr0, boot->reg_id_dfr0); 1128 taint |= check_update_ftr_reg(SYS_ID_DFR1_EL1, cpu, 1129 info->reg_id_dfr1, boot->reg_id_dfr1); 1130 taint |= check_update_ftr_reg(SYS_ID_ISAR0_EL1, cpu, 1131 info->reg_id_isar0, boot->reg_id_isar0); 1132 taint |= check_update_ftr_reg(SYS_ID_ISAR1_EL1, cpu, 1133 info->reg_id_isar1, boot->reg_id_isar1); 1134 taint |= check_update_ftr_reg(SYS_ID_ISAR2_EL1, cpu, 1135 info->reg_id_isar2, boot->reg_id_isar2); 1136 taint |= check_update_ftr_reg(SYS_ID_ISAR3_EL1, cpu, 1137 info->reg_id_isar3, boot->reg_id_isar3); 1138 taint |= check_update_ftr_reg(SYS_ID_ISAR4_EL1, cpu, 1139 info->reg_id_isar4, boot->reg_id_isar4); 1140 taint |= check_update_ftr_reg(SYS_ID_ISAR5_EL1, cpu, 1141 info->reg_id_isar5, boot->reg_id_isar5); 1142 taint |= check_update_ftr_reg(SYS_ID_ISAR6_EL1, cpu, 1143 info->reg_id_isar6, boot->reg_id_isar6); 1144 1145 /* 1146 * Regardless of the value of the AuxReg field, the AIFSR, ADFSR, and 1147 * ACTLR formats could differ across CPUs and therefore would have to 1148 * be trapped for virtualization anyway. 1149 */ 1150 taint |= check_update_ftr_reg(SYS_ID_MMFR0_EL1, cpu, 1151 info->reg_id_mmfr0, boot->reg_id_mmfr0); 1152 taint |= check_update_ftr_reg(SYS_ID_MMFR1_EL1, cpu, 1153 info->reg_id_mmfr1, boot->reg_id_mmfr1); 1154 taint |= check_update_ftr_reg(SYS_ID_MMFR2_EL1, cpu, 1155 info->reg_id_mmfr2, boot->reg_id_mmfr2); 1156 taint |= check_update_ftr_reg(SYS_ID_MMFR3_EL1, cpu, 1157 info->reg_id_mmfr3, boot->reg_id_mmfr3); 1158 taint |= check_update_ftr_reg(SYS_ID_MMFR4_EL1, cpu, 1159 info->reg_id_mmfr4, boot->reg_id_mmfr4); 1160 taint |= check_update_ftr_reg(SYS_ID_MMFR5_EL1, cpu, 1161 info->reg_id_mmfr5, boot->reg_id_mmfr5); 1162 taint |= check_update_ftr_reg(SYS_ID_PFR0_EL1, cpu, 1163 info->reg_id_pfr0, boot->reg_id_pfr0); 1164 taint |= check_update_ftr_reg(SYS_ID_PFR1_EL1, cpu, 1165 info->reg_id_pfr1, boot->reg_id_pfr1); 1166 taint |= check_update_ftr_reg(SYS_ID_PFR2_EL1, cpu, 1167 info->reg_id_pfr2, boot->reg_id_pfr2); 1168 taint |= check_update_ftr_reg(SYS_MVFR0_EL1, cpu, 1169 info->reg_mvfr0, boot->reg_mvfr0); 1170 taint |= check_update_ftr_reg(SYS_MVFR1_EL1, cpu, 1171 info->reg_mvfr1, boot->reg_mvfr1); 1172 taint |= check_update_ftr_reg(SYS_MVFR2_EL1, cpu, 1173 info->reg_mvfr2, boot->reg_mvfr2); 1174 1175 return taint; 1176 } 1177 1178 /* 1179 * Update system wide CPU feature registers with the values from a 1180 * non-boot CPU. Also performs SANITY checks to make sure that there 1181 * aren't any insane variations from that of the boot CPU. 1182 */ 1183 void update_cpu_features(int cpu, 1184 struct cpuinfo_arm64 *info, 1185 struct cpuinfo_arm64 *boot) 1186 { 1187 int taint = 0; 1188 1189 /* 1190 * The kernel can handle differing I-cache policies, but otherwise 1191 * caches should look identical. Userspace JITs will make use of 1192 * *minLine. 1193 */ 1194 taint |= check_update_ftr_reg(SYS_CTR_EL0, cpu, 1195 info->reg_ctr, boot->reg_ctr); 1196 1197 /* 1198 * Userspace may perform DC ZVA instructions. Mismatched block sizes 1199 * could result in too much or too little memory being zeroed if a 1200 * process is preempted and migrated between CPUs. 1201 */ 1202 taint |= check_update_ftr_reg(SYS_DCZID_EL0, cpu, 1203 info->reg_dczid, boot->reg_dczid); 1204 1205 /* If different, timekeeping will be broken (especially with KVM) */ 1206 taint |= check_update_ftr_reg(SYS_CNTFRQ_EL0, cpu, 1207 info->reg_cntfrq, boot->reg_cntfrq); 1208 1209 /* 1210 * The kernel uses self-hosted debug features and expects CPUs to 1211 * support identical debug features. We presently need CTX_CMPs, WRPs, 1212 * and BRPs to be identical. 1213 * ID_AA64DFR1 is currently RES0. 1214 */ 1215 taint |= check_update_ftr_reg(SYS_ID_AA64DFR0_EL1, cpu, 1216 info->reg_id_aa64dfr0, boot->reg_id_aa64dfr0); 1217 taint |= check_update_ftr_reg(SYS_ID_AA64DFR1_EL1, cpu, 1218 info->reg_id_aa64dfr1, boot->reg_id_aa64dfr1); 1219 /* 1220 * Even in big.LITTLE, processors should be identical instruction-set 1221 * wise. 1222 */ 1223 taint |= check_update_ftr_reg(SYS_ID_AA64ISAR0_EL1, cpu, 1224 info->reg_id_aa64isar0, boot->reg_id_aa64isar0); 1225 taint |= check_update_ftr_reg(SYS_ID_AA64ISAR1_EL1, cpu, 1226 info->reg_id_aa64isar1, boot->reg_id_aa64isar1); 1227 taint |= check_update_ftr_reg(SYS_ID_AA64ISAR2_EL1, cpu, 1228 info->reg_id_aa64isar2, boot->reg_id_aa64isar2); 1229 1230 /* 1231 * Differing PARange support is fine as long as all peripherals and 1232 * memory are mapped within the minimum PARange of all CPUs. 1233 * Linux should not care about secure memory. 1234 */ 1235 taint |= check_update_ftr_reg(SYS_ID_AA64MMFR0_EL1, cpu, 1236 info->reg_id_aa64mmfr0, boot->reg_id_aa64mmfr0); 1237 taint |= check_update_ftr_reg(SYS_ID_AA64MMFR1_EL1, cpu, 1238 info->reg_id_aa64mmfr1, boot->reg_id_aa64mmfr1); 1239 taint |= check_update_ftr_reg(SYS_ID_AA64MMFR2_EL1, cpu, 1240 info->reg_id_aa64mmfr2, boot->reg_id_aa64mmfr2); 1241 1242 taint |= check_update_ftr_reg(SYS_ID_AA64PFR0_EL1, cpu, 1243 info->reg_id_aa64pfr0, boot->reg_id_aa64pfr0); 1244 taint |= check_update_ftr_reg(SYS_ID_AA64PFR1_EL1, cpu, 1245 info->reg_id_aa64pfr1, boot->reg_id_aa64pfr1); 1246 1247 taint |= check_update_ftr_reg(SYS_ID_AA64ZFR0_EL1, cpu, 1248 info->reg_id_aa64zfr0, boot->reg_id_aa64zfr0); 1249 1250 taint |= check_update_ftr_reg(SYS_ID_AA64SMFR0_EL1, cpu, 1251 info->reg_id_aa64smfr0, boot->reg_id_aa64smfr0); 1252 1253 if (IS_ENABLED(CONFIG_ARM64_SVE) && 1254 id_aa64pfr0_sve(read_sanitised_ftr_reg(SYS_ID_AA64PFR0_EL1))) { 1255 info->reg_zcr = read_zcr_features(); 1256 taint |= check_update_ftr_reg(SYS_ZCR_EL1, cpu, 1257 info->reg_zcr, boot->reg_zcr); 1258 1259 /* Probe vector lengths */ 1260 if (!system_capabilities_finalized()) 1261 vec_update_vq_map(ARM64_VEC_SVE); 1262 } 1263 1264 if (IS_ENABLED(CONFIG_ARM64_SME) && 1265 id_aa64pfr1_sme(read_sanitised_ftr_reg(SYS_ID_AA64PFR1_EL1))) { 1266 info->reg_smcr = read_smcr_features(); 1267 /* 1268 * We mask out SMPS since even if the hardware 1269 * supports priorities the kernel does not at present 1270 * and we block access to them. 1271 */ 1272 info->reg_smidr = read_cpuid(SMIDR_EL1) & ~SMIDR_EL1_SMPS; 1273 taint |= check_update_ftr_reg(SYS_SMCR_EL1, cpu, 1274 info->reg_smcr, boot->reg_smcr); 1275 1276 /* Probe vector lengths */ 1277 if (!system_capabilities_finalized()) 1278 vec_update_vq_map(ARM64_VEC_SME); 1279 } 1280 1281 /* 1282 * The kernel uses the LDGM/STGM instructions and the number of tags 1283 * they read/write depends on the GMID_EL1.BS field. Check that the 1284 * value is the same on all CPUs. 1285 */ 1286 if (IS_ENABLED(CONFIG_ARM64_MTE) && 1287 id_aa64pfr1_mte(info->reg_id_aa64pfr1)) { 1288 taint |= check_update_ftr_reg(SYS_GMID_EL1, cpu, 1289 info->reg_gmid, boot->reg_gmid); 1290 } 1291 1292 /* 1293 * If we don't have AArch32 at all then skip the checks entirely 1294 * as the register values may be UNKNOWN and we're not going to be 1295 * using them for anything. 1296 * 1297 * This relies on a sanitised view of the AArch64 ID registers 1298 * (e.g. SYS_ID_AA64PFR0_EL1), so we call it last. 1299 */ 1300 if (id_aa64pfr0_32bit_el0(info->reg_id_aa64pfr0)) { 1301 lazy_init_32bit_cpu_features(info, boot); 1302 taint |= update_32bit_cpu_features(cpu, &info->aarch32, 1303 &boot->aarch32); 1304 } 1305 1306 /* 1307 * Mismatched CPU features are a recipe for disaster. Don't even 1308 * pretend to support them. 1309 */ 1310 if (taint) { 1311 pr_warn_once("Unsupported CPU feature variation detected.\n"); 1312 add_taint(TAINT_CPU_OUT_OF_SPEC, LOCKDEP_STILL_OK); 1313 } 1314 } 1315 1316 u64 read_sanitised_ftr_reg(u32 id) 1317 { 1318 struct arm64_ftr_reg *regp = get_arm64_ftr_reg(id); 1319 1320 if (!regp) 1321 return 0; 1322 return regp->sys_val; 1323 } 1324 EXPORT_SYMBOL_GPL(read_sanitised_ftr_reg); 1325 1326 #define read_sysreg_case(r) \ 1327 case r: val = read_sysreg_s(r); break; 1328 1329 /* 1330 * __read_sysreg_by_encoding() - Used by a STARTING cpu before cpuinfo is populated. 1331 * Read the system register on the current CPU 1332 */ 1333 u64 __read_sysreg_by_encoding(u32 sys_id) 1334 { 1335 struct arm64_ftr_reg *regp; 1336 u64 val; 1337 1338 switch (sys_id) { 1339 read_sysreg_case(SYS_ID_PFR0_EL1); 1340 read_sysreg_case(SYS_ID_PFR1_EL1); 1341 read_sysreg_case(SYS_ID_PFR2_EL1); 1342 read_sysreg_case(SYS_ID_DFR0_EL1); 1343 read_sysreg_case(SYS_ID_DFR1_EL1); 1344 read_sysreg_case(SYS_ID_MMFR0_EL1); 1345 read_sysreg_case(SYS_ID_MMFR1_EL1); 1346 read_sysreg_case(SYS_ID_MMFR2_EL1); 1347 read_sysreg_case(SYS_ID_MMFR3_EL1); 1348 read_sysreg_case(SYS_ID_MMFR4_EL1); 1349 read_sysreg_case(SYS_ID_MMFR5_EL1); 1350 read_sysreg_case(SYS_ID_ISAR0_EL1); 1351 read_sysreg_case(SYS_ID_ISAR1_EL1); 1352 read_sysreg_case(SYS_ID_ISAR2_EL1); 1353 read_sysreg_case(SYS_ID_ISAR3_EL1); 1354 read_sysreg_case(SYS_ID_ISAR4_EL1); 1355 read_sysreg_case(SYS_ID_ISAR5_EL1); 1356 read_sysreg_case(SYS_ID_ISAR6_EL1); 1357 read_sysreg_case(SYS_MVFR0_EL1); 1358 read_sysreg_case(SYS_MVFR1_EL1); 1359 read_sysreg_case(SYS_MVFR2_EL1); 1360 1361 read_sysreg_case(SYS_ID_AA64PFR0_EL1); 1362 read_sysreg_case(SYS_ID_AA64PFR1_EL1); 1363 read_sysreg_case(SYS_ID_AA64ZFR0_EL1); 1364 read_sysreg_case(SYS_ID_AA64SMFR0_EL1); 1365 read_sysreg_case(SYS_ID_AA64DFR0_EL1); 1366 read_sysreg_case(SYS_ID_AA64DFR1_EL1); 1367 read_sysreg_case(SYS_ID_AA64MMFR0_EL1); 1368 read_sysreg_case(SYS_ID_AA64MMFR1_EL1); 1369 read_sysreg_case(SYS_ID_AA64MMFR2_EL1); 1370 read_sysreg_case(SYS_ID_AA64ISAR0_EL1); 1371 read_sysreg_case(SYS_ID_AA64ISAR1_EL1); 1372 read_sysreg_case(SYS_ID_AA64ISAR2_EL1); 1373 1374 read_sysreg_case(SYS_CNTFRQ_EL0); 1375 read_sysreg_case(SYS_CTR_EL0); 1376 read_sysreg_case(SYS_DCZID_EL0); 1377 1378 default: 1379 BUG(); 1380 return 0; 1381 } 1382 1383 regp = get_arm64_ftr_reg(sys_id); 1384 if (regp) { 1385 val &= ~regp->override->mask; 1386 val |= (regp->override->val & regp->override->mask); 1387 } 1388 1389 return val; 1390 } 1391 1392 #include <linux/irqchip/arm-gic-v3.h> 1393 1394 static bool 1395 feature_matches(u64 reg, const struct arm64_cpu_capabilities *entry) 1396 { 1397 int val = cpuid_feature_extract_field_width(reg, entry->field_pos, 1398 entry->field_width, 1399 entry->sign); 1400 1401 return val >= entry->min_field_value; 1402 } 1403 1404 static bool 1405 has_cpuid_feature(const struct arm64_cpu_capabilities *entry, int scope) 1406 { 1407 u64 val; 1408 1409 WARN_ON(scope == SCOPE_LOCAL_CPU && preemptible()); 1410 if (scope == SCOPE_SYSTEM) 1411 val = read_sanitised_ftr_reg(entry->sys_reg); 1412 else 1413 val = __read_sysreg_by_encoding(entry->sys_reg); 1414 1415 return feature_matches(val, entry); 1416 } 1417 1418 const struct cpumask *system_32bit_el0_cpumask(void) 1419 { 1420 if (!system_supports_32bit_el0()) 1421 return cpu_none_mask; 1422 1423 if (static_branch_unlikely(&arm64_mismatched_32bit_el0)) 1424 return cpu_32bit_el0_mask; 1425 1426 return cpu_possible_mask; 1427 } 1428 1429 static int __init parse_32bit_el0_param(char *str) 1430 { 1431 allow_mismatched_32bit_el0 = true; 1432 return 0; 1433 } 1434 early_param("allow_mismatched_32bit_el0", parse_32bit_el0_param); 1435 1436 static ssize_t aarch32_el0_show(struct device *dev, 1437 struct device_attribute *attr, char *buf) 1438 { 1439 const struct cpumask *mask = system_32bit_el0_cpumask(); 1440 1441 return sysfs_emit(buf, "%*pbl\n", cpumask_pr_args(mask)); 1442 } 1443 static const DEVICE_ATTR_RO(aarch32_el0); 1444 1445 static int __init aarch32_el0_sysfs_init(void) 1446 { 1447 if (!allow_mismatched_32bit_el0) 1448 return 0; 1449 1450 return device_create_file(cpu_subsys.dev_root, &dev_attr_aarch32_el0); 1451 } 1452 device_initcall(aarch32_el0_sysfs_init); 1453 1454 static bool has_32bit_el0(const struct arm64_cpu_capabilities *entry, int scope) 1455 { 1456 if (!has_cpuid_feature(entry, scope)) 1457 return allow_mismatched_32bit_el0; 1458 1459 if (scope == SCOPE_SYSTEM) 1460 pr_info("detected: 32-bit EL0 Support\n"); 1461 1462 return true; 1463 } 1464 1465 static bool has_useable_gicv3_cpuif(const struct arm64_cpu_capabilities *entry, int scope) 1466 { 1467 bool has_sre; 1468 1469 if (!has_cpuid_feature(entry, scope)) 1470 return false; 1471 1472 has_sre = gic_enable_sre(); 1473 if (!has_sre) 1474 pr_warn_once("%s present but disabled by higher exception level\n", 1475 entry->desc); 1476 1477 return has_sre; 1478 } 1479 1480 static bool has_no_hw_prefetch(const struct arm64_cpu_capabilities *entry, int __unused) 1481 { 1482 u32 midr = read_cpuid_id(); 1483 1484 /* Cavium ThunderX pass 1.x and 2.x */ 1485 return midr_is_cpu_model_range(midr, MIDR_THUNDERX, 1486 MIDR_CPU_VAR_REV(0, 0), 1487 MIDR_CPU_VAR_REV(1, MIDR_REVISION_MASK)); 1488 } 1489 1490 static bool has_no_fpsimd(const struct arm64_cpu_capabilities *entry, int __unused) 1491 { 1492 u64 pfr0 = read_sanitised_ftr_reg(SYS_ID_AA64PFR0_EL1); 1493 1494 return cpuid_feature_extract_signed_field(pfr0, 1495 ID_AA64PFR0_FP_SHIFT) < 0; 1496 } 1497 1498 static bool has_cache_idc(const struct arm64_cpu_capabilities *entry, 1499 int scope) 1500 { 1501 u64 ctr; 1502 1503 if (scope == SCOPE_SYSTEM) 1504 ctr = arm64_ftr_reg_ctrel0.sys_val; 1505 else 1506 ctr = read_cpuid_effective_cachetype(); 1507 1508 return ctr & BIT(CTR_EL0_IDC_SHIFT); 1509 } 1510 1511 static void cpu_emulate_effective_ctr(const struct arm64_cpu_capabilities *__unused) 1512 { 1513 /* 1514 * If the CPU exposes raw CTR_EL0.IDC = 0, while effectively 1515 * CTR_EL0.IDC = 1 (from CLIDR values), we need to trap accesses 1516 * to the CTR_EL0 on this CPU and emulate it with the real/safe 1517 * value. 1518 */ 1519 if (!(read_cpuid_cachetype() & BIT(CTR_EL0_IDC_SHIFT))) 1520 sysreg_clear_set(sctlr_el1, SCTLR_EL1_UCT, 0); 1521 } 1522 1523 static bool has_cache_dic(const struct arm64_cpu_capabilities *entry, 1524 int scope) 1525 { 1526 u64 ctr; 1527 1528 if (scope == SCOPE_SYSTEM) 1529 ctr = arm64_ftr_reg_ctrel0.sys_val; 1530 else 1531 ctr = read_cpuid_cachetype(); 1532 1533 return ctr & BIT(CTR_EL0_DIC_SHIFT); 1534 } 1535 1536 static bool __maybe_unused 1537 has_useable_cnp(const struct arm64_cpu_capabilities *entry, int scope) 1538 { 1539 /* 1540 * Kdump isn't guaranteed to power-off all secondary CPUs, CNP 1541 * may share TLB entries with a CPU stuck in the crashed 1542 * kernel. 1543 */ 1544 if (is_kdump_kernel()) 1545 return false; 1546 1547 if (cpus_have_const_cap(ARM64_WORKAROUND_NVIDIA_CARMEL_CNP)) 1548 return false; 1549 1550 return has_cpuid_feature(entry, scope); 1551 } 1552 1553 /* 1554 * This check is triggered during the early boot before the cpufeature 1555 * is initialised. Checking the status on the local CPU allows the boot 1556 * CPU to detect the need for non-global mappings and thus avoiding a 1557 * pagetable re-write after all the CPUs are booted. This check will be 1558 * anyway run on individual CPUs, allowing us to get the consistent 1559 * state once the SMP CPUs are up and thus make the switch to non-global 1560 * mappings if required. 1561 */ 1562 bool kaslr_requires_kpti(void) 1563 { 1564 if (!IS_ENABLED(CONFIG_RANDOMIZE_BASE)) 1565 return false; 1566 1567 /* 1568 * E0PD does a similar job to KPTI so can be used instead 1569 * where available. 1570 */ 1571 if (IS_ENABLED(CONFIG_ARM64_E0PD)) { 1572 u64 mmfr2 = read_sysreg_s(SYS_ID_AA64MMFR2_EL1); 1573 if (cpuid_feature_extract_unsigned_field(mmfr2, 1574 ID_AA64MMFR2_E0PD_SHIFT)) 1575 return false; 1576 } 1577 1578 /* 1579 * Systems affected by Cavium erratum 24756 are incompatible 1580 * with KPTI. 1581 */ 1582 if (IS_ENABLED(CONFIG_CAVIUM_ERRATUM_27456)) { 1583 extern const struct midr_range cavium_erratum_27456_cpus[]; 1584 1585 if (is_midr_in_range_list(read_cpuid_id(), 1586 cavium_erratum_27456_cpus)) 1587 return false; 1588 } 1589 1590 return kaslr_offset() > 0; 1591 } 1592 1593 static bool __meltdown_safe = true; 1594 static int __kpti_forced; /* 0: not forced, >0: forced on, <0: forced off */ 1595 1596 static bool unmap_kernel_at_el0(const struct arm64_cpu_capabilities *entry, 1597 int scope) 1598 { 1599 /* List of CPUs that are not vulnerable and don't need KPTI */ 1600 static const struct midr_range kpti_safe_list[] = { 1601 MIDR_ALL_VERSIONS(MIDR_CAVIUM_THUNDERX2), 1602 MIDR_ALL_VERSIONS(MIDR_BRCM_VULCAN), 1603 MIDR_ALL_VERSIONS(MIDR_BRAHMA_B53), 1604 MIDR_ALL_VERSIONS(MIDR_CORTEX_A35), 1605 MIDR_ALL_VERSIONS(MIDR_CORTEX_A53), 1606 MIDR_ALL_VERSIONS(MIDR_CORTEX_A55), 1607 MIDR_ALL_VERSIONS(MIDR_CORTEX_A57), 1608 MIDR_ALL_VERSIONS(MIDR_CORTEX_A72), 1609 MIDR_ALL_VERSIONS(MIDR_CORTEX_A73), 1610 MIDR_ALL_VERSIONS(MIDR_HISI_TSV110), 1611 MIDR_ALL_VERSIONS(MIDR_NVIDIA_CARMEL), 1612 MIDR_ALL_VERSIONS(MIDR_QCOM_KRYO_2XX_GOLD), 1613 MIDR_ALL_VERSIONS(MIDR_QCOM_KRYO_2XX_SILVER), 1614 MIDR_ALL_VERSIONS(MIDR_QCOM_KRYO_3XX_SILVER), 1615 MIDR_ALL_VERSIONS(MIDR_QCOM_KRYO_4XX_SILVER), 1616 { /* sentinel */ } 1617 }; 1618 char const *str = "kpti command line option"; 1619 bool meltdown_safe; 1620 1621 meltdown_safe = is_midr_in_range_list(read_cpuid_id(), kpti_safe_list); 1622 1623 /* Defer to CPU feature registers */ 1624 if (has_cpuid_feature(entry, scope)) 1625 meltdown_safe = true; 1626 1627 if (!meltdown_safe) 1628 __meltdown_safe = false; 1629 1630 /* 1631 * For reasons that aren't entirely clear, enabling KPTI on Cavium 1632 * ThunderX leads to apparent I-cache corruption of kernel text, which 1633 * ends as well as you might imagine. Don't even try. We cannot rely 1634 * on the cpus_have_*cap() helpers here to detect the CPU erratum 1635 * because cpucap detection order may change. However, since we know 1636 * affected CPUs are always in a homogeneous configuration, it is 1637 * safe to rely on this_cpu_has_cap() here. 1638 */ 1639 if (this_cpu_has_cap(ARM64_WORKAROUND_CAVIUM_27456)) { 1640 str = "ARM64_WORKAROUND_CAVIUM_27456"; 1641 __kpti_forced = -1; 1642 } 1643 1644 /* Useful for KASLR robustness */ 1645 if (kaslr_requires_kpti()) { 1646 if (!__kpti_forced) { 1647 str = "KASLR"; 1648 __kpti_forced = 1; 1649 } 1650 } 1651 1652 if (cpu_mitigations_off() && !__kpti_forced) { 1653 str = "mitigations=off"; 1654 __kpti_forced = -1; 1655 } 1656 1657 if (!IS_ENABLED(CONFIG_UNMAP_KERNEL_AT_EL0)) { 1658 pr_info_once("kernel page table isolation disabled by kernel configuration\n"); 1659 return false; 1660 } 1661 1662 /* Forced? */ 1663 if (__kpti_forced) { 1664 pr_info_once("kernel page table isolation forced %s by %s\n", 1665 __kpti_forced > 0 ? "ON" : "OFF", str); 1666 return __kpti_forced > 0; 1667 } 1668 1669 return !meltdown_safe; 1670 } 1671 1672 #ifdef CONFIG_UNMAP_KERNEL_AT_EL0 1673 #define KPTI_NG_TEMP_VA (-(1UL << PMD_SHIFT)) 1674 1675 extern 1676 void create_kpti_ng_temp_pgd(pgd_t *pgdir, phys_addr_t phys, unsigned long virt, 1677 phys_addr_t size, pgprot_t prot, 1678 phys_addr_t (*pgtable_alloc)(int), int flags); 1679 1680 static phys_addr_t kpti_ng_temp_alloc; 1681 1682 static phys_addr_t kpti_ng_pgd_alloc(int shift) 1683 { 1684 kpti_ng_temp_alloc -= PAGE_SIZE; 1685 return kpti_ng_temp_alloc; 1686 } 1687 1688 static void __nocfi 1689 kpti_install_ng_mappings(const struct arm64_cpu_capabilities *__unused) 1690 { 1691 typedef void (kpti_remap_fn)(int, int, phys_addr_t, unsigned long); 1692 extern kpti_remap_fn idmap_kpti_install_ng_mappings; 1693 kpti_remap_fn *remap_fn; 1694 1695 int cpu = smp_processor_id(); 1696 int levels = CONFIG_PGTABLE_LEVELS; 1697 int order = order_base_2(levels); 1698 u64 kpti_ng_temp_pgd_pa = 0; 1699 pgd_t *kpti_ng_temp_pgd; 1700 u64 alloc = 0; 1701 1702 if (__this_cpu_read(this_cpu_vector) == vectors) { 1703 const char *v = arm64_get_bp_hardening_vector(EL1_VECTOR_KPTI); 1704 1705 __this_cpu_write(this_cpu_vector, v); 1706 } 1707 1708 /* 1709 * We don't need to rewrite the page-tables if either we've done 1710 * it already or we have KASLR enabled and therefore have not 1711 * created any global mappings at all. 1712 */ 1713 if (arm64_use_ng_mappings) 1714 return; 1715 1716 remap_fn = (void *)__pa_symbol(function_nocfi(idmap_kpti_install_ng_mappings)); 1717 1718 if (!cpu) { 1719 alloc = __get_free_pages(GFP_ATOMIC | __GFP_ZERO, order); 1720 kpti_ng_temp_pgd = (pgd_t *)(alloc + (levels - 1) * PAGE_SIZE); 1721 kpti_ng_temp_alloc = kpti_ng_temp_pgd_pa = __pa(kpti_ng_temp_pgd); 1722 1723 // 1724 // Create a minimal page table hierarchy that permits us to map 1725 // the swapper page tables temporarily as we traverse them. 1726 // 1727 // The physical pages are laid out as follows: 1728 // 1729 // +--------+-/-------+-/------ +-\\--------+ 1730 // : PTE[] : | PMD[] : | PUD[] : || PGD[] : 1731 // +--------+-\-------+-\------ +-//--------+ 1732 // ^ 1733 // The first page is mapped into this hierarchy at a PMD_SHIFT 1734 // aligned virtual address, so that we can manipulate the PTE 1735 // level entries while the mapping is active. The first entry 1736 // covers the PTE[] page itself, the remaining entries are free 1737 // to be used as a ad-hoc fixmap. 1738 // 1739 create_kpti_ng_temp_pgd(kpti_ng_temp_pgd, __pa(alloc), 1740 KPTI_NG_TEMP_VA, PAGE_SIZE, PAGE_KERNEL, 1741 kpti_ng_pgd_alloc, 0); 1742 } 1743 1744 cpu_install_idmap(); 1745 remap_fn(cpu, num_online_cpus(), kpti_ng_temp_pgd_pa, KPTI_NG_TEMP_VA); 1746 cpu_uninstall_idmap(); 1747 1748 if (!cpu) { 1749 free_pages(alloc, order); 1750 arm64_use_ng_mappings = true; 1751 } 1752 } 1753 #else 1754 static void 1755 kpti_install_ng_mappings(const struct arm64_cpu_capabilities *__unused) 1756 { 1757 } 1758 #endif /* CONFIG_UNMAP_KERNEL_AT_EL0 */ 1759 1760 static int __init parse_kpti(char *str) 1761 { 1762 bool enabled; 1763 int ret = strtobool(str, &enabled); 1764 1765 if (ret) 1766 return ret; 1767 1768 __kpti_forced = enabled ? 1 : -1; 1769 return 0; 1770 } 1771 early_param("kpti", parse_kpti); 1772 1773 #ifdef CONFIG_ARM64_HW_AFDBM 1774 static inline void __cpu_enable_hw_dbm(void) 1775 { 1776 u64 tcr = read_sysreg(tcr_el1) | TCR_HD; 1777 1778 write_sysreg(tcr, tcr_el1); 1779 isb(); 1780 local_flush_tlb_all(); 1781 } 1782 1783 static bool cpu_has_broken_dbm(void) 1784 { 1785 /* List of CPUs which have broken DBM support. */ 1786 static const struct midr_range cpus[] = { 1787 #ifdef CONFIG_ARM64_ERRATUM_1024718 1788 MIDR_ALL_VERSIONS(MIDR_CORTEX_A55), 1789 /* Kryo4xx Silver (rdpe => r1p0) */ 1790 MIDR_REV(MIDR_QCOM_KRYO_4XX_SILVER, 0xd, 0xe), 1791 #endif 1792 #ifdef CONFIG_ARM64_ERRATUM_2051678 1793 MIDR_REV_RANGE(MIDR_CORTEX_A510, 0, 0, 2), 1794 #endif 1795 {}, 1796 }; 1797 1798 return is_midr_in_range_list(read_cpuid_id(), cpus); 1799 } 1800 1801 static bool cpu_can_use_dbm(const struct arm64_cpu_capabilities *cap) 1802 { 1803 return has_cpuid_feature(cap, SCOPE_LOCAL_CPU) && 1804 !cpu_has_broken_dbm(); 1805 } 1806 1807 static void cpu_enable_hw_dbm(struct arm64_cpu_capabilities const *cap) 1808 { 1809 if (cpu_can_use_dbm(cap)) 1810 __cpu_enable_hw_dbm(); 1811 } 1812 1813 static bool has_hw_dbm(const struct arm64_cpu_capabilities *cap, 1814 int __unused) 1815 { 1816 static bool detected = false; 1817 /* 1818 * DBM is a non-conflicting feature. i.e, the kernel can safely 1819 * run a mix of CPUs with and without the feature. So, we 1820 * unconditionally enable the capability to allow any late CPU 1821 * to use the feature. We only enable the control bits on the 1822 * CPU, if it actually supports. 1823 * 1824 * We have to make sure we print the "feature" detection only 1825 * when at least one CPU actually uses it. So check if this CPU 1826 * can actually use it and print the message exactly once. 1827 * 1828 * This is safe as all CPUs (including secondary CPUs - due to the 1829 * LOCAL_CPU scope - and the hotplugged CPUs - via verification) 1830 * goes through the "matches" check exactly once. Also if a CPU 1831 * matches the criteria, it is guaranteed that the CPU will turn 1832 * the DBM on, as the capability is unconditionally enabled. 1833 */ 1834 if (!detected && cpu_can_use_dbm(cap)) { 1835 detected = true; 1836 pr_info("detected: Hardware dirty bit management\n"); 1837 } 1838 1839 return true; 1840 } 1841 1842 #endif 1843 1844 #ifdef CONFIG_ARM64_AMU_EXTN 1845 1846 /* 1847 * The "amu_cpus" cpumask only signals that the CPU implementation for the 1848 * flagged CPUs supports the Activity Monitors Unit (AMU) but does not provide 1849 * information regarding all the events that it supports. When a CPU bit is 1850 * set in the cpumask, the user of this feature can only rely on the presence 1851 * of the 4 fixed counters for that CPU. But this does not guarantee that the 1852 * counters are enabled or access to these counters is enabled by code 1853 * executed at higher exception levels (firmware). 1854 */ 1855 static struct cpumask amu_cpus __read_mostly; 1856 1857 bool cpu_has_amu_feat(int cpu) 1858 { 1859 return cpumask_test_cpu(cpu, &amu_cpus); 1860 } 1861 1862 int get_cpu_with_amu_feat(void) 1863 { 1864 return cpumask_any(&amu_cpus); 1865 } 1866 1867 static void cpu_amu_enable(struct arm64_cpu_capabilities const *cap) 1868 { 1869 if (has_cpuid_feature(cap, SCOPE_LOCAL_CPU)) { 1870 pr_info("detected CPU%d: Activity Monitors Unit (AMU)\n", 1871 smp_processor_id()); 1872 cpumask_set_cpu(smp_processor_id(), &amu_cpus); 1873 1874 /* 0 reference values signal broken/disabled counters */ 1875 if (!this_cpu_has_cap(ARM64_WORKAROUND_2457168)) 1876 update_freq_counters_refs(); 1877 } 1878 } 1879 1880 static bool has_amu(const struct arm64_cpu_capabilities *cap, 1881 int __unused) 1882 { 1883 /* 1884 * The AMU extension is a non-conflicting feature: the kernel can 1885 * safely run a mix of CPUs with and without support for the 1886 * activity monitors extension. Therefore, unconditionally enable 1887 * the capability to allow any late CPU to use the feature. 1888 * 1889 * With this feature unconditionally enabled, the cpu_enable 1890 * function will be called for all CPUs that match the criteria, 1891 * including secondary and hotplugged, marking this feature as 1892 * present on that respective CPU. The enable function will also 1893 * print a detection message. 1894 */ 1895 1896 return true; 1897 } 1898 #else 1899 int get_cpu_with_amu_feat(void) 1900 { 1901 return nr_cpu_ids; 1902 } 1903 #endif 1904 1905 static bool runs_at_el2(const struct arm64_cpu_capabilities *entry, int __unused) 1906 { 1907 return is_kernel_in_hyp_mode(); 1908 } 1909 1910 static void cpu_copy_el2regs(const struct arm64_cpu_capabilities *__unused) 1911 { 1912 /* 1913 * Copy register values that aren't redirected by hardware. 1914 * 1915 * Before code patching, we only set tpidr_el1, all CPUs need to copy 1916 * this value to tpidr_el2 before we patch the code. Once we've done 1917 * that, freshly-onlined CPUs will set tpidr_el2, so we don't need to 1918 * do anything here. 1919 */ 1920 if (!alternative_is_applied(ARM64_HAS_VIRT_HOST_EXTN)) 1921 write_sysreg(read_sysreg(tpidr_el1), tpidr_el2); 1922 } 1923 1924 #ifdef CONFIG_ARM64_PAN 1925 static void cpu_enable_pan(const struct arm64_cpu_capabilities *__unused) 1926 { 1927 /* 1928 * We modify PSTATE. This won't work from irq context as the PSTATE 1929 * is discarded once we return from the exception. 1930 */ 1931 WARN_ON_ONCE(in_interrupt()); 1932 1933 sysreg_clear_set(sctlr_el1, SCTLR_EL1_SPAN, 0); 1934 set_pstate_pan(1); 1935 } 1936 #endif /* CONFIG_ARM64_PAN */ 1937 1938 #ifdef CONFIG_ARM64_RAS_EXTN 1939 static void cpu_clear_disr(const struct arm64_cpu_capabilities *__unused) 1940 { 1941 /* Firmware may have left a deferred SError in this register. */ 1942 write_sysreg_s(0, SYS_DISR_EL1); 1943 } 1944 #endif /* CONFIG_ARM64_RAS_EXTN */ 1945 1946 #ifdef CONFIG_ARM64_PTR_AUTH 1947 static bool has_address_auth_cpucap(const struct arm64_cpu_capabilities *entry, int scope) 1948 { 1949 int boot_val, sec_val; 1950 1951 /* We don't expect to be called with SCOPE_SYSTEM */ 1952 WARN_ON(scope == SCOPE_SYSTEM); 1953 /* 1954 * The ptr-auth feature levels are not intercompatible with lower 1955 * levels. Hence we must match ptr-auth feature level of the secondary 1956 * CPUs with that of the boot CPU. The level of boot cpu is fetched 1957 * from the sanitised register whereas direct register read is done for 1958 * the secondary CPUs. 1959 * The sanitised feature state is guaranteed to match that of the 1960 * boot CPU as a mismatched secondary CPU is parked before it gets 1961 * a chance to update the state, with the capability. 1962 */ 1963 boot_val = cpuid_feature_extract_field(read_sanitised_ftr_reg(entry->sys_reg), 1964 entry->field_pos, entry->sign); 1965 if (scope & SCOPE_BOOT_CPU) 1966 return boot_val >= entry->min_field_value; 1967 /* Now check for the secondary CPUs with SCOPE_LOCAL_CPU scope */ 1968 sec_val = cpuid_feature_extract_field(__read_sysreg_by_encoding(entry->sys_reg), 1969 entry->field_pos, entry->sign); 1970 return (sec_val >= entry->min_field_value) && (sec_val == boot_val); 1971 } 1972 1973 static bool has_address_auth_metacap(const struct arm64_cpu_capabilities *entry, 1974 int scope) 1975 { 1976 bool api = has_address_auth_cpucap(cpu_hwcaps_ptrs[ARM64_HAS_ADDRESS_AUTH_IMP_DEF], scope); 1977 bool apa = has_address_auth_cpucap(cpu_hwcaps_ptrs[ARM64_HAS_ADDRESS_AUTH_ARCH_QARMA5], scope); 1978 bool apa3 = has_address_auth_cpucap(cpu_hwcaps_ptrs[ARM64_HAS_ADDRESS_AUTH_ARCH_QARMA3], scope); 1979 1980 return apa || apa3 || api; 1981 } 1982 1983 static bool has_generic_auth(const struct arm64_cpu_capabilities *entry, 1984 int __unused) 1985 { 1986 bool gpi = __system_matches_cap(ARM64_HAS_GENERIC_AUTH_IMP_DEF); 1987 bool gpa = __system_matches_cap(ARM64_HAS_GENERIC_AUTH_ARCH_QARMA5); 1988 bool gpa3 = __system_matches_cap(ARM64_HAS_GENERIC_AUTH_ARCH_QARMA3); 1989 1990 return gpa || gpa3 || gpi; 1991 } 1992 #endif /* CONFIG_ARM64_PTR_AUTH */ 1993 1994 #ifdef CONFIG_ARM64_E0PD 1995 static void cpu_enable_e0pd(struct arm64_cpu_capabilities const *cap) 1996 { 1997 if (this_cpu_has_cap(ARM64_HAS_E0PD)) 1998 sysreg_clear_set(tcr_el1, 0, TCR_E0PD1); 1999 } 2000 #endif /* CONFIG_ARM64_E0PD */ 2001 2002 #ifdef CONFIG_ARM64_PSEUDO_NMI 2003 static bool enable_pseudo_nmi; 2004 2005 static int __init early_enable_pseudo_nmi(char *p) 2006 { 2007 return strtobool(p, &enable_pseudo_nmi); 2008 } 2009 early_param("irqchip.gicv3_pseudo_nmi", early_enable_pseudo_nmi); 2010 2011 static bool can_use_gic_priorities(const struct arm64_cpu_capabilities *entry, 2012 int scope) 2013 { 2014 return enable_pseudo_nmi && has_useable_gicv3_cpuif(entry, scope); 2015 } 2016 #endif 2017 2018 #ifdef CONFIG_ARM64_BTI 2019 static void bti_enable(const struct arm64_cpu_capabilities *__unused) 2020 { 2021 /* 2022 * Use of X16/X17 for tail-calls and trampolines that jump to 2023 * function entry points using BR is a requirement for 2024 * marking binaries with GNU_PROPERTY_AARCH64_FEATURE_1_BTI. 2025 * So, be strict and forbid other BRs using other registers to 2026 * jump onto a PACIxSP instruction: 2027 */ 2028 sysreg_clear_set(sctlr_el1, 0, SCTLR_EL1_BT0 | SCTLR_EL1_BT1); 2029 isb(); 2030 } 2031 #endif /* CONFIG_ARM64_BTI */ 2032 2033 #ifdef CONFIG_ARM64_MTE 2034 static void cpu_enable_mte(struct arm64_cpu_capabilities const *cap) 2035 { 2036 sysreg_clear_set(sctlr_el1, 0, SCTLR_ELx_ATA | SCTLR_EL1_ATA0); 2037 isb(); 2038 2039 /* 2040 * Clear the tags in the zero page. This needs to be done via the 2041 * linear map which has the Tagged attribute. 2042 */ 2043 if (!test_and_set_bit(PG_mte_tagged, &ZERO_PAGE(0)->flags)) 2044 mte_clear_page_tags(lm_alias(empty_zero_page)); 2045 2046 kasan_init_hw_tags_cpu(); 2047 } 2048 #endif /* CONFIG_ARM64_MTE */ 2049 2050 static void elf_hwcap_fixup(void) 2051 { 2052 #ifdef CONFIG_ARM64_ERRATUM_1742098 2053 if (cpus_have_const_cap(ARM64_WORKAROUND_1742098)) 2054 compat_elf_hwcap2 &= ~COMPAT_HWCAP2_AES; 2055 #endif /* ARM64_ERRATUM_1742098 */ 2056 } 2057 2058 #ifdef CONFIG_KVM 2059 static bool is_kvm_protected_mode(const struct arm64_cpu_capabilities *entry, int __unused) 2060 { 2061 return kvm_get_mode() == KVM_MODE_PROTECTED; 2062 } 2063 #endif /* CONFIG_KVM */ 2064 2065 static void cpu_trap_el0_impdef(const struct arm64_cpu_capabilities *__unused) 2066 { 2067 sysreg_clear_set(sctlr_el1, 0, SCTLR_EL1_TIDCP); 2068 } 2069 2070 /* Internal helper functions to match cpu capability type */ 2071 static bool 2072 cpucap_late_cpu_optional(const struct arm64_cpu_capabilities *cap) 2073 { 2074 return !!(cap->type & ARM64_CPUCAP_OPTIONAL_FOR_LATE_CPU); 2075 } 2076 2077 static bool 2078 cpucap_late_cpu_permitted(const struct arm64_cpu_capabilities *cap) 2079 { 2080 return !!(cap->type & ARM64_CPUCAP_PERMITTED_FOR_LATE_CPU); 2081 } 2082 2083 static bool 2084 cpucap_panic_on_conflict(const struct arm64_cpu_capabilities *cap) 2085 { 2086 return !!(cap->type & ARM64_CPUCAP_PANIC_ON_CONFLICT); 2087 } 2088 2089 static const struct arm64_cpu_capabilities arm64_features[] = { 2090 { 2091 .desc = "GIC system register CPU interface", 2092 .capability = ARM64_HAS_SYSREG_GIC_CPUIF, 2093 .type = ARM64_CPUCAP_STRICT_BOOT_CPU_FEATURE, 2094 .matches = has_useable_gicv3_cpuif, 2095 .sys_reg = SYS_ID_AA64PFR0_EL1, 2096 .field_pos = ID_AA64PFR0_GIC_SHIFT, 2097 .field_width = 4, 2098 .sign = FTR_UNSIGNED, 2099 .min_field_value = 1, 2100 }, 2101 { 2102 .desc = "Enhanced Counter Virtualization", 2103 .capability = ARM64_HAS_ECV, 2104 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2105 .matches = has_cpuid_feature, 2106 .sys_reg = SYS_ID_AA64MMFR0_EL1, 2107 .field_pos = ID_AA64MMFR0_ECV_SHIFT, 2108 .field_width = 4, 2109 .sign = FTR_UNSIGNED, 2110 .min_field_value = 1, 2111 }, 2112 #ifdef CONFIG_ARM64_PAN 2113 { 2114 .desc = "Privileged Access Never", 2115 .capability = ARM64_HAS_PAN, 2116 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2117 .matches = has_cpuid_feature, 2118 .sys_reg = SYS_ID_AA64MMFR1_EL1, 2119 .field_pos = ID_AA64MMFR1_PAN_SHIFT, 2120 .field_width = 4, 2121 .sign = FTR_UNSIGNED, 2122 .min_field_value = 1, 2123 .cpu_enable = cpu_enable_pan, 2124 }, 2125 #endif /* CONFIG_ARM64_PAN */ 2126 #ifdef CONFIG_ARM64_EPAN 2127 { 2128 .desc = "Enhanced Privileged Access Never", 2129 .capability = ARM64_HAS_EPAN, 2130 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2131 .matches = has_cpuid_feature, 2132 .sys_reg = SYS_ID_AA64MMFR1_EL1, 2133 .field_pos = ID_AA64MMFR1_PAN_SHIFT, 2134 .field_width = 4, 2135 .sign = FTR_UNSIGNED, 2136 .min_field_value = 3, 2137 }, 2138 #endif /* CONFIG_ARM64_EPAN */ 2139 #ifdef CONFIG_ARM64_LSE_ATOMICS 2140 { 2141 .desc = "LSE atomic instructions", 2142 .capability = ARM64_HAS_LSE_ATOMICS, 2143 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2144 .matches = has_cpuid_feature, 2145 .sys_reg = SYS_ID_AA64ISAR0_EL1, 2146 .field_pos = ID_AA64ISAR0_EL1_ATOMIC_SHIFT, 2147 .field_width = 4, 2148 .sign = FTR_UNSIGNED, 2149 .min_field_value = 2, 2150 }, 2151 #endif /* CONFIG_ARM64_LSE_ATOMICS */ 2152 { 2153 .desc = "Software prefetching using PRFM", 2154 .capability = ARM64_HAS_NO_HW_PREFETCH, 2155 .type = ARM64_CPUCAP_WEAK_LOCAL_CPU_FEATURE, 2156 .matches = has_no_hw_prefetch, 2157 }, 2158 { 2159 .desc = "Virtualization Host Extensions", 2160 .capability = ARM64_HAS_VIRT_HOST_EXTN, 2161 .type = ARM64_CPUCAP_STRICT_BOOT_CPU_FEATURE, 2162 .matches = runs_at_el2, 2163 .cpu_enable = cpu_copy_el2regs, 2164 }, 2165 { 2166 .capability = ARM64_HAS_32BIT_EL0_DO_NOT_USE, 2167 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2168 .matches = has_32bit_el0, 2169 .sys_reg = SYS_ID_AA64PFR0_EL1, 2170 .sign = FTR_UNSIGNED, 2171 .field_pos = ID_AA64PFR0_EL0_SHIFT, 2172 .field_width = 4, 2173 .min_field_value = ID_AA64PFR0_ELx_32BIT_64BIT, 2174 }, 2175 #ifdef CONFIG_KVM 2176 { 2177 .desc = "32-bit EL1 Support", 2178 .capability = ARM64_HAS_32BIT_EL1, 2179 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2180 .matches = has_cpuid_feature, 2181 .sys_reg = SYS_ID_AA64PFR0_EL1, 2182 .sign = FTR_UNSIGNED, 2183 .field_pos = ID_AA64PFR0_EL1_SHIFT, 2184 .field_width = 4, 2185 .min_field_value = ID_AA64PFR0_ELx_32BIT_64BIT, 2186 }, 2187 { 2188 .desc = "Protected KVM", 2189 .capability = ARM64_KVM_PROTECTED_MODE, 2190 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2191 .matches = is_kvm_protected_mode, 2192 }, 2193 #endif 2194 { 2195 .desc = "Kernel page table isolation (KPTI)", 2196 .capability = ARM64_UNMAP_KERNEL_AT_EL0, 2197 .type = ARM64_CPUCAP_BOOT_RESTRICTED_CPU_LOCAL_FEATURE, 2198 /* 2199 * The ID feature fields below are used to indicate that 2200 * the CPU doesn't need KPTI. See unmap_kernel_at_el0 for 2201 * more details. 2202 */ 2203 .sys_reg = SYS_ID_AA64PFR0_EL1, 2204 .field_pos = ID_AA64PFR0_CSV3_SHIFT, 2205 .field_width = 4, 2206 .min_field_value = 1, 2207 .matches = unmap_kernel_at_el0, 2208 .cpu_enable = kpti_install_ng_mappings, 2209 }, 2210 { 2211 /* FP/SIMD is not implemented */ 2212 .capability = ARM64_HAS_NO_FPSIMD, 2213 .type = ARM64_CPUCAP_BOOT_RESTRICTED_CPU_LOCAL_FEATURE, 2214 .min_field_value = 0, 2215 .matches = has_no_fpsimd, 2216 }, 2217 #ifdef CONFIG_ARM64_PMEM 2218 { 2219 .desc = "Data cache clean to Point of Persistence", 2220 .capability = ARM64_HAS_DCPOP, 2221 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2222 .matches = has_cpuid_feature, 2223 .sys_reg = SYS_ID_AA64ISAR1_EL1, 2224 .field_pos = ID_AA64ISAR1_EL1_DPB_SHIFT, 2225 .field_width = 4, 2226 .min_field_value = 1, 2227 }, 2228 { 2229 .desc = "Data cache clean to Point of Deep Persistence", 2230 .capability = ARM64_HAS_DCPODP, 2231 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2232 .matches = has_cpuid_feature, 2233 .sys_reg = SYS_ID_AA64ISAR1_EL1, 2234 .sign = FTR_UNSIGNED, 2235 .field_pos = ID_AA64ISAR1_EL1_DPB_SHIFT, 2236 .field_width = 4, 2237 .min_field_value = 2, 2238 }, 2239 #endif 2240 #ifdef CONFIG_ARM64_SVE 2241 { 2242 .desc = "Scalable Vector Extension", 2243 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2244 .capability = ARM64_SVE, 2245 .sys_reg = SYS_ID_AA64PFR0_EL1, 2246 .sign = FTR_UNSIGNED, 2247 .field_pos = ID_AA64PFR0_SVE_SHIFT, 2248 .field_width = 4, 2249 .min_field_value = ID_AA64PFR0_SVE, 2250 .matches = has_cpuid_feature, 2251 .cpu_enable = sve_kernel_enable, 2252 }, 2253 #endif /* CONFIG_ARM64_SVE */ 2254 #ifdef CONFIG_ARM64_RAS_EXTN 2255 { 2256 .desc = "RAS Extension Support", 2257 .capability = ARM64_HAS_RAS_EXTN, 2258 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2259 .matches = has_cpuid_feature, 2260 .sys_reg = SYS_ID_AA64PFR0_EL1, 2261 .sign = FTR_UNSIGNED, 2262 .field_pos = ID_AA64PFR0_RAS_SHIFT, 2263 .field_width = 4, 2264 .min_field_value = ID_AA64PFR0_RAS_V1, 2265 .cpu_enable = cpu_clear_disr, 2266 }, 2267 #endif /* CONFIG_ARM64_RAS_EXTN */ 2268 #ifdef CONFIG_ARM64_AMU_EXTN 2269 { 2270 /* 2271 * The feature is enabled by default if CONFIG_ARM64_AMU_EXTN=y. 2272 * Therefore, don't provide .desc as we don't want the detection 2273 * message to be shown until at least one CPU is detected to 2274 * support the feature. 2275 */ 2276 .capability = ARM64_HAS_AMU_EXTN, 2277 .type = ARM64_CPUCAP_WEAK_LOCAL_CPU_FEATURE, 2278 .matches = has_amu, 2279 .sys_reg = SYS_ID_AA64PFR0_EL1, 2280 .sign = FTR_UNSIGNED, 2281 .field_pos = ID_AA64PFR0_AMU_SHIFT, 2282 .field_width = 4, 2283 .min_field_value = ID_AA64PFR0_AMU, 2284 .cpu_enable = cpu_amu_enable, 2285 }, 2286 #endif /* CONFIG_ARM64_AMU_EXTN */ 2287 { 2288 .desc = "Data cache clean to the PoU not required for I/D coherence", 2289 .capability = ARM64_HAS_CACHE_IDC, 2290 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2291 .matches = has_cache_idc, 2292 .cpu_enable = cpu_emulate_effective_ctr, 2293 }, 2294 { 2295 .desc = "Instruction cache invalidation not required for I/D coherence", 2296 .capability = ARM64_HAS_CACHE_DIC, 2297 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2298 .matches = has_cache_dic, 2299 }, 2300 { 2301 .desc = "Stage-2 Force Write-Back", 2302 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2303 .capability = ARM64_HAS_STAGE2_FWB, 2304 .sys_reg = SYS_ID_AA64MMFR2_EL1, 2305 .sign = FTR_UNSIGNED, 2306 .field_pos = ID_AA64MMFR2_FWB_SHIFT, 2307 .field_width = 4, 2308 .min_field_value = 1, 2309 .matches = has_cpuid_feature, 2310 }, 2311 { 2312 .desc = "ARMv8.4 Translation Table Level", 2313 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2314 .capability = ARM64_HAS_ARMv8_4_TTL, 2315 .sys_reg = SYS_ID_AA64MMFR2_EL1, 2316 .sign = FTR_UNSIGNED, 2317 .field_pos = ID_AA64MMFR2_TTL_SHIFT, 2318 .field_width = 4, 2319 .min_field_value = 1, 2320 .matches = has_cpuid_feature, 2321 }, 2322 { 2323 .desc = "TLB range maintenance instructions", 2324 .capability = ARM64_HAS_TLB_RANGE, 2325 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2326 .matches = has_cpuid_feature, 2327 .sys_reg = SYS_ID_AA64ISAR0_EL1, 2328 .field_pos = ID_AA64ISAR0_EL1_TLB_SHIFT, 2329 .field_width = 4, 2330 .sign = FTR_UNSIGNED, 2331 .min_field_value = ID_AA64ISAR0_EL1_TLB_RANGE, 2332 }, 2333 #ifdef CONFIG_ARM64_HW_AFDBM 2334 { 2335 /* 2336 * Since we turn this on always, we don't want the user to 2337 * think that the feature is available when it may not be. 2338 * So hide the description. 2339 * 2340 * .desc = "Hardware pagetable Dirty Bit Management", 2341 * 2342 */ 2343 .type = ARM64_CPUCAP_WEAK_LOCAL_CPU_FEATURE, 2344 .capability = ARM64_HW_DBM, 2345 .sys_reg = SYS_ID_AA64MMFR1_EL1, 2346 .sign = FTR_UNSIGNED, 2347 .field_pos = ID_AA64MMFR1_HADBS_SHIFT, 2348 .field_width = 4, 2349 .min_field_value = 2, 2350 .matches = has_hw_dbm, 2351 .cpu_enable = cpu_enable_hw_dbm, 2352 }, 2353 #endif 2354 { 2355 .desc = "CRC32 instructions", 2356 .capability = ARM64_HAS_CRC32, 2357 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2358 .matches = has_cpuid_feature, 2359 .sys_reg = SYS_ID_AA64ISAR0_EL1, 2360 .field_pos = ID_AA64ISAR0_EL1_CRC32_SHIFT, 2361 .field_width = 4, 2362 .min_field_value = 1, 2363 }, 2364 { 2365 .desc = "Speculative Store Bypassing Safe (SSBS)", 2366 .capability = ARM64_SSBS, 2367 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2368 .matches = has_cpuid_feature, 2369 .sys_reg = SYS_ID_AA64PFR1_EL1, 2370 .field_pos = ID_AA64PFR1_SSBS_SHIFT, 2371 .field_width = 4, 2372 .sign = FTR_UNSIGNED, 2373 .min_field_value = ID_AA64PFR1_SSBS_PSTATE_ONLY, 2374 }, 2375 #ifdef CONFIG_ARM64_CNP 2376 { 2377 .desc = "Common not Private translations", 2378 .capability = ARM64_HAS_CNP, 2379 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2380 .matches = has_useable_cnp, 2381 .sys_reg = SYS_ID_AA64MMFR2_EL1, 2382 .sign = FTR_UNSIGNED, 2383 .field_pos = ID_AA64MMFR2_CNP_SHIFT, 2384 .field_width = 4, 2385 .min_field_value = 1, 2386 .cpu_enable = cpu_enable_cnp, 2387 }, 2388 #endif 2389 { 2390 .desc = "Speculation barrier (SB)", 2391 .capability = ARM64_HAS_SB, 2392 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2393 .matches = has_cpuid_feature, 2394 .sys_reg = SYS_ID_AA64ISAR1_EL1, 2395 .field_pos = ID_AA64ISAR1_EL1_SB_SHIFT, 2396 .field_width = 4, 2397 .sign = FTR_UNSIGNED, 2398 .min_field_value = 1, 2399 }, 2400 #ifdef CONFIG_ARM64_PTR_AUTH 2401 { 2402 .desc = "Address authentication (architected QARMA5 algorithm)", 2403 .capability = ARM64_HAS_ADDRESS_AUTH_ARCH_QARMA5, 2404 .type = ARM64_CPUCAP_BOOT_CPU_FEATURE, 2405 .sys_reg = SYS_ID_AA64ISAR1_EL1, 2406 .sign = FTR_UNSIGNED, 2407 .field_pos = ID_AA64ISAR1_EL1_APA_SHIFT, 2408 .field_width = 4, 2409 .min_field_value = ID_AA64ISAR1_EL1_APA_PAuth, 2410 .matches = has_address_auth_cpucap, 2411 }, 2412 { 2413 .desc = "Address authentication (architected QARMA3 algorithm)", 2414 .capability = ARM64_HAS_ADDRESS_AUTH_ARCH_QARMA3, 2415 .type = ARM64_CPUCAP_BOOT_CPU_FEATURE, 2416 .sys_reg = SYS_ID_AA64ISAR2_EL1, 2417 .sign = FTR_UNSIGNED, 2418 .field_pos = ID_AA64ISAR2_EL1_APA3_SHIFT, 2419 .field_width = 4, 2420 .min_field_value = ID_AA64ISAR2_EL1_APA3_PAuth, 2421 .matches = has_address_auth_cpucap, 2422 }, 2423 { 2424 .desc = "Address authentication (IMP DEF algorithm)", 2425 .capability = ARM64_HAS_ADDRESS_AUTH_IMP_DEF, 2426 .type = ARM64_CPUCAP_BOOT_CPU_FEATURE, 2427 .sys_reg = SYS_ID_AA64ISAR1_EL1, 2428 .sign = FTR_UNSIGNED, 2429 .field_pos = ID_AA64ISAR1_EL1_API_SHIFT, 2430 .field_width = 4, 2431 .min_field_value = ID_AA64ISAR1_EL1_API_PAuth, 2432 .matches = has_address_auth_cpucap, 2433 }, 2434 { 2435 .capability = ARM64_HAS_ADDRESS_AUTH, 2436 .type = ARM64_CPUCAP_BOOT_CPU_FEATURE, 2437 .matches = has_address_auth_metacap, 2438 }, 2439 { 2440 .desc = "Generic authentication (architected QARMA5 algorithm)", 2441 .capability = ARM64_HAS_GENERIC_AUTH_ARCH_QARMA5, 2442 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2443 .sys_reg = SYS_ID_AA64ISAR1_EL1, 2444 .sign = FTR_UNSIGNED, 2445 .field_pos = ID_AA64ISAR1_EL1_GPA_SHIFT, 2446 .field_width = 4, 2447 .min_field_value = ID_AA64ISAR1_EL1_GPA_IMP, 2448 .matches = has_cpuid_feature, 2449 }, 2450 { 2451 .desc = "Generic authentication (architected QARMA3 algorithm)", 2452 .capability = ARM64_HAS_GENERIC_AUTH_ARCH_QARMA3, 2453 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2454 .sys_reg = SYS_ID_AA64ISAR2_EL1, 2455 .sign = FTR_UNSIGNED, 2456 .field_pos = ID_AA64ISAR2_EL1_GPA3_SHIFT, 2457 .field_width = 4, 2458 .min_field_value = ID_AA64ISAR2_EL1_GPA3_IMP, 2459 .matches = has_cpuid_feature, 2460 }, 2461 { 2462 .desc = "Generic authentication (IMP DEF algorithm)", 2463 .capability = ARM64_HAS_GENERIC_AUTH_IMP_DEF, 2464 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2465 .sys_reg = SYS_ID_AA64ISAR1_EL1, 2466 .sign = FTR_UNSIGNED, 2467 .field_pos = ID_AA64ISAR1_EL1_GPI_SHIFT, 2468 .field_width = 4, 2469 .min_field_value = ID_AA64ISAR1_EL1_GPI_IMP, 2470 .matches = has_cpuid_feature, 2471 }, 2472 { 2473 .capability = ARM64_HAS_GENERIC_AUTH, 2474 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2475 .matches = has_generic_auth, 2476 }, 2477 #endif /* CONFIG_ARM64_PTR_AUTH */ 2478 #ifdef CONFIG_ARM64_PSEUDO_NMI 2479 { 2480 /* 2481 * Depends on having GICv3 2482 */ 2483 .desc = "IRQ priority masking", 2484 .capability = ARM64_HAS_IRQ_PRIO_MASKING, 2485 .type = ARM64_CPUCAP_STRICT_BOOT_CPU_FEATURE, 2486 .matches = can_use_gic_priorities, 2487 .sys_reg = SYS_ID_AA64PFR0_EL1, 2488 .field_pos = ID_AA64PFR0_GIC_SHIFT, 2489 .field_width = 4, 2490 .sign = FTR_UNSIGNED, 2491 .min_field_value = 1, 2492 }, 2493 #endif 2494 #ifdef CONFIG_ARM64_E0PD 2495 { 2496 .desc = "E0PD", 2497 .capability = ARM64_HAS_E0PD, 2498 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2499 .sys_reg = SYS_ID_AA64MMFR2_EL1, 2500 .sign = FTR_UNSIGNED, 2501 .field_width = 4, 2502 .field_pos = ID_AA64MMFR2_E0PD_SHIFT, 2503 .matches = has_cpuid_feature, 2504 .min_field_value = 1, 2505 .cpu_enable = cpu_enable_e0pd, 2506 }, 2507 #endif 2508 { 2509 .desc = "Random Number Generator", 2510 .capability = ARM64_HAS_RNG, 2511 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2512 .matches = has_cpuid_feature, 2513 .sys_reg = SYS_ID_AA64ISAR0_EL1, 2514 .field_pos = ID_AA64ISAR0_EL1_RNDR_SHIFT, 2515 .field_width = 4, 2516 .sign = FTR_UNSIGNED, 2517 .min_field_value = 1, 2518 }, 2519 #ifdef CONFIG_ARM64_BTI 2520 { 2521 .desc = "Branch Target Identification", 2522 .capability = ARM64_BTI, 2523 #ifdef CONFIG_ARM64_BTI_KERNEL 2524 .type = ARM64_CPUCAP_STRICT_BOOT_CPU_FEATURE, 2525 #else 2526 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2527 #endif 2528 .matches = has_cpuid_feature, 2529 .cpu_enable = bti_enable, 2530 .sys_reg = SYS_ID_AA64PFR1_EL1, 2531 .field_pos = ID_AA64PFR1_BT_SHIFT, 2532 .field_width = 4, 2533 .min_field_value = ID_AA64PFR1_BT_BTI, 2534 .sign = FTR_UNSIGNED, 2535 }, 2536 #endif 2537 #ifdef CONFIG_ARM64_MTE 2538 { 2539 .desc = "Memory Tagging Extension", 2540 .capability = ARM64_MTE, 2541 .type = ARM64_CPUCAP_STRICT_BOOT_CPU_FEATURE, 2542 .matches = has_cpuid_feature, 2543 .sys_reg = SYS_ID_AA64PFR1_EL1, 2544 .field_pos = ID_AA64PFR1_MTE_SHIFT, 2545 .field_width = 4, 2546 .min_field_value = ID_AA64PFR1_MTE, 2547 .sign = FTR_UNSIGNED, 2548 .cpu_enable = cpu_enable_mte, 2549 }, 2550 { 2551 .desc = "Asymmetric MTE Tag Check Fault", 2552 .capability = ARM64_MTE_ASYMM, 2553 .type = ARM64_CPUCAP_BOOT_CPU_FEATURE, 2554 .matches = has_cpuid_feature, 2555 .sys_reg = SYS_ID_AA64PFR1_EL1, 2556 .field_pos = ID_AA64PFR1_MTE_SHIFT, 2557 .field_width = 4, 2558 .min_field_value = ID_AA64PFR1_MTE_ASYMM, 2559 .sign = FTR_UNSIGNED, 2560 }, 2561 #endif /* CONFIG_ARM64_MTE */ 2562 { 2563 .desc = "RCpc load-acquire (LDAPR)", 2564 .capability = ARM64_HAS_LDAPR, 2565 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2566 .sys_reg = SYS_ID_AA64ISAR1_EL1, 2567 .sign = FTR_UNSIGNED, 2568 .field_pos = ID_AA64ISAR1_EL1_LRCPC_SHIFT, 2569 .field_width = 4, 2570 .matches = has_cpuid_feature, 2571 .min_field_value = 1, 2572 }, 2573 #ifdef CONFIG_ARM64_SME 2574 { 2575 .desc = "Scalable Matrix Extension", 2576 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2577 .capability = ARM64_SME, 2578 .sys_reg = SYS_ID_AA64PFR1_EL1, 2579 .sign = FTR_UNSIGNED, 2580 .field_pos = ID_AA64PFR1_SME_SHIFT, 2581 .field_width = 4, 2582 .min_field_value = ID_AA64PFR1_SME, 2583 .matches = has_cpuid_feature, 2584 .cpu_enable = sme_kernel_enable, 2585 }, 2586 /* FA64 should be sorted after the base SME capability */ 2587 { 2588 .desc = "FA64", 2589 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2590 .capability = ARM64_SME_FA64, 2591 .sys_reg = SYS_ID_AA64SMFR0_EL1, 2592 .sign = FTR_UNSIGNED, 2593 .field_pos = ID_AA64SMFR0_EL1_FA64_SHIFT, 2594 .field_width = 1, 2595 .min_field_value = ID_AA64SMFR0_EL1_FA64_IMP, 2596 .matches = has_cpuid_feature, 2597 .cpu_enable = fa64_kernel_enable, 2598 }, 2599 #endif /* CONFIG_ARM64_SME */ 2600 { 2601 .desc = "WFx with timeout", 2602 .capability = ARM64_HAS_WFXT, 2603 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2604 .sys_reg = SYS_ID_AA64ISAR2_EL1, 2605 .sign = FTR_UNSIGNED, 2606 .field_pos = ID_AA64ISAR2_EL1_WFxT_SHIFT, 2607 .field_width = 4, 2608 .matches = has_cpuid_feature, 2609 .min_field_value = ID_AA64ISAR2_EL1_WFxT_IMP, 2610 }, 2611 { 2612 .desc = "Trap EL0 IMPLEMENTATION DEFINED functionality", 2613 .capability = ARM64_HAS_TIDCP1, 2614 .type = ARM64_CPUCAP_SYSTEM_FEATURE, 2615 .sys_reg = SYS_ID_AA64MMFR1_EL1, 2616 .sign = FTR_UNSIGNED, 2617 .field_pos = ID_AA64MMFR1_TIDCP1_SHIFT, 2618 .field_width = 4, 2619 .min_field_value = ID_AA64MMFR1_TIDCP1_IMP, 2620 .matches = has_cpuid_feature, 2621 .cpu_enable = cpu_trap_el0_impdef, 2622 }, 2623 {}, 2624 }; 2625 2626 #define HWCAP_CPUID_MATCH(reg, field, width, s, min_value) \ 2627 .matches = has_cpuid_feature, \ 2628 .sys_reg = reg, \ 2629 .field_pos = field, \ 2630 .field_width = width, \ 2631 .sign = s, \ 2632 .min_field_value = min_value, 2633 2634 #define __HWCAP_CAP(name, cap_type, cap) \ 2635 .desc = name, \ 2636 .type = ARM64_CPUCAP_SYSTEM_FEATURE, \ 2637 .hwcap_type = cap_type, \ 2638 .hwcap = cap, \ 2639 2640 #define HWCAP_CAP(reg, field, width, s, min_value, cap_type, cap) \ 2641 { \ 2642 __HWCAP_CAP(#cap, cap_type, cap) \ 2643 HWCAP_CPUID_MATCH(reg, field, width, s, min_value) \ 2644 } 2645 2646 #define HWCAP_MULTI_CAP(list, cap_type, cap) \ 2647 { \ 2648 __HWCAP_CAP(#cap, cap_type, cap) \ 2649 .matches = cpucap_multi_entry_cap_matches, \ 2650 .match_list = list, \ 2651 } 2652 2653 #define HWCAP_CAP_MATCH(match, cap_type, cap) \ 2654 { \ 2655 __HWCAP_CAP(#cap, cap_type, cap) \ 2656 .matches = match, \ 2657 } 2658 2659 #ifdef CONFIG_ARM64_PTR_AUTH 2660 static const struct arm64_cpu_capabilities ptr_auth_hwcap_addr_matches[] = { 2661 { 2662 HWCAP_CPUID_MATCH(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_EL1_APA_SHIFT, 2663 4, FTR_UNSIGNED, 2664 ID_AA64ISAR1_EL1_APA_PAuth) 2665 }, 2666 { 2667 HWCAP_CPUID_MATCH(SYS_ID_AA64ISAR2_EL1, ID_AA64ISAR2_EL1_APA3_SHIFT, 2668 4, FTR_UNSIGNED, ID_AA64ISAR2_EL1_APA3_PAuth) 2669 }, 2670 { 2671 HWCAP_CPUID_MATCH(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_EL1_API_SHIFT, 2672 4, FTR_UNSIGNED, ID_AA64ISAR1_EL1_API_PAuth) 2673 }, 2674 {}, 2675 }; 2676 2677 static const struct arm64_cpu_capabilities ptr_auth_hwcap_gen_matches[] = { 2678 { 2679 HWCAP_CPUID_MATCH(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_EL1_GPA_SHIFT, 2680 4, FTR_UNSIGNED, ID_AA64ISAR1_EL1_GPA_IMP) 2681 }, 2682 { 2683 HWCAP_CPUID_MATCH(SYS_ID_AA64ISAR2_EL1, ID_AA64ISAR2_EL1_GPA3_SHIFT, 2684 4, FTR_UNSIGNED, ID_AA64ISAR2_EL1_GPA3_IMP) 2685 }, 2686 { 2687 HWCAP_CPUID_MATCH(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_EL1_GPI_SHIFT, 2688 4, FTR_UNSIGNED, ID_AA64ISAR1_EL1_GPI_IMP) 2689 }, 2690 {}, 2691 }; 2692 #endif 2693 2694 static const struct arm64_cpu_capabilities arm64_elf_hwcaps[] = { 2695 HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_EL1_AES_SHIFT, 4, FTR_UNSIGNED, 2, CAP_HWCAP, KERNEL_HWCAP_PMULL), 2696 HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_EL1_AES_SHIFT, 4, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_AES), 2697 HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_EL1_SHA1_SHIFT, 4, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_SHA1), 2698 HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_EL1_SHA2_SHIFT, 4, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_SHA2), 2699 HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_EL1_SHA2_SHIFT, 4, FTR_UNSIGNED, 2, CAP_HWCAP, KERNEL_HWCAP_SHA512), 2700 HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_EL1_CRC32_SHIFT, 4, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_CRC32), 2701 HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_EL1_ATOMIC_SHIFT, 4, FTR_UNSIGNED, 2, CAP_HWCAP, KERNEL_HWCAP_ATOMICS), 2702 HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_EL1_RDM_SHIFT, 4, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_ASIMDRDM), 2703 HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_EL1_SHA3_SHIFT, 4, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_SHA3), 2704 HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_EL1_SM3_SHIFT, 4, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_SM3), 2705 HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_EL1_SM4_SHIFT, 4, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_SM4), 2706 HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_EL1_DP_SHIFT, 4, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_ASIMDDP), 2707 HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_EL1_FHM_SHIFT, 4, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_ASIMDFHM), 2708 HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_EL1_TS_SHIFT, 4, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_FLAGM), 2709 HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_EL1_TS_SHIFT, 4, FTR_UNSIGNED, 2, CAP_HWCAP, KERNEL_HWCAP_FLAGM2), 2710 HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_EL1_RNDR_SHIFT, 4, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_RNG), 2711 HWCAP_CAP(SYS_ID_AA64PFR0_EL1, ID_AA64PFR0_FP_SHIFT, 4, FTR_SIGNED, 0, CAP_HWCAP, KERNEL_HWCAP_FP), 2712 HWCAP_CAP(SYS_ID_AA64PFR0_EL1, ID_AA64PFR0_FP_SHIFT, 4, FTR_SIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_FPHP), 2713 HWCAP_CAP(SYS_ID_AA64PFR0_EL1, ID_AA64PFR0_ASIMD_SHIFT, 4, FTR_SIGNED, 0, CAP_HWCAP, KERNEL_HWCAP_ASIMD), 2714 HWCAP_CAP(SYS_ID_AA64PFR0_EL1, ID_AA64PFR0_ASIMD_SHIFT, 4, FTR_SIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_ASIMDHP), 2715 HWCAP_CAP(SYS_ID_AA64PFR0_EL1, ID_AA64PFR0_DIT_SHIFT, 4, FTR_SIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_DIT), 2716 HWCAP_CAP(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_EL1_DPB_SHIFT, 4, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_DCPOP), 2717 HWCAP_CAP(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_EL1_DPB_SHIFT, 4, FTR_UNSIGNED, 2, CAP_HWCAP, KERNEL_HWCAP_DCPODP), 2718 HWCAP_CAP(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_EL1_JSCVT_SHIFT, 4, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_JSCVT), 2719 HWCAP_CAP(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_EL1_FCMA_SHIFT, 4, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_FCMA), 2720 HWCAP_CAP(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_EL1_LRCPC_SHIFT, 4, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_LRCPC), 2721 HWCAP_CAP(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_EL1_LRCPC_SHIFT, 4, FTR_UNSIGNED, 2, CAP_HWCAP, KERNEL_HWCAP_ILRCPC), 2722 HWCAP_CAP(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_EL1_FRINTTS_SHIFT, 4, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_FRINT), 2723 HWCAP_CAP(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_EL1_SB_SHIFT, 4, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_SB), 2724 HWCAP_CAP(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_EL1_BF16_SHIFT, 4, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_BF16), 2725 HWCAP_CAP(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_EL1_BF16_SHIFT, 4, FTR_UNSIGNED, 2, CAP_HWCAP, KERNEL_HWCAP_EBF16), 2726 HWCAP_CAP(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_EL1_DGH_SHIFT, 4, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_DGH), 2727 HWCAP_CAP(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_EL1_I8MM_SHIFT, 4, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_I8MM), 2728 HWCAP_CAP(SYS_ID_AA64MMFR2_EL1, ID_AA64MMFR2_AT_SHIFT, 4, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_USCAT), 2729 #ifdef CONFIG_ARM64_SVE 2730 HWCAP_CAP(SYS_ID_AA64PFR0_EL1, ID_AA64PFR0_SVE_SHIFT, 4, FTR_UNSIGNED, ID_AA64PFR0_SVE, CAP_HWCAP, KERNEL_HWCAP_SVE), 2731 HWCAP_CAP(SYS_ID_AA64ZFR0_EL1, ID_AA64ZFR0_EL1_SVEver_SHIFT, 4, FTR_UNSIGNED, ID_AA64ZFR0_EL1_SVEver_SVE2, CAP_HWCAP, KERNEL_HWCAP_SVE2), 2732 HWCAP_CAP(SYS_ID_AA64ZFR0_EL1, ID_AA64ZFR0_EL1_AES_SHIFT, 4, FTR_UNSIGNED, ID_AA64ZFR0_EL1_AES_IMP, CAP_HWCAP, KERNEL_HWCAP_SVEAES), 2733 HWCAP_CAP(SYS_ID_AA64ZFR0_EL1, ID_AA64ZFR0_EL1_AES_SHIFT, 4, FTR_UNSIGNED, ID_AA64ZFR0_EL1_AES_PMULL128, CAP_HWCAP, KERNEL_HWCAP_SVEPMULL), 2734 HWCAP_CAP(SYS_ID_AA64ZFR0_EL1, ID_AA64ZFR0_EL1_BitPerm_SHIFT, 4, FTR_UNSIGNED, ID_AA64ZFR0_EL1_BitPerm_IMP, CAP_HWCAP, KERNEL_HWCAP_SVEBITPERM), 2735 HWCAP_CAP(SYS_ID_AA64ZFR0_EL1, ID_AA64ZFR0_EL1_BF16_SHIFT, 4, FTR_UNSIGNED, ID_AA64ZFR0_EL1_BF16_IMP, CAP_HWCAP, KERNEL_HWCAP_SVEBF16), 2736 HWCAP_CAP(SYS_ID_AA64ZFR0_EL1, ID_AA64ZFR0_EL1_SHA3_SHIFT, 4, FTR_UNSIGNED, ID_AA64ZFR0_EL1_SHA3_IMP, CAP_HWCAP, KERNEL_HWCAP_SVESHA3), 2737 HWCAP_CAP(SYS_ID_AA64ZFR0_EL1, ID_AA64ZFR0_EL1_SM4_SHIFT, 4, FTR_UNSIGNED, ID_AA64ZFR0_EL1_SM4_IMP, CAP_HWCAP, KERNEL_HWCAP_SVESM4), 2738 HWCAP_CAP(SYS_ID_AA64ZFR0_EL1, ID_AA64ZFR0_EL1_I8MM_SHIFT, 4, FTR_UNSIGNED, ID_AA64ZFR0_EL1_I8MM_IMP, CAP_HWCAP, KERNEL_HWCAP_SVEI8MM), 2739 HWCAP_CAP(SYS_ID_AA64ZFR0_EL1, ID_AA64ZFR0_EL1_F32MM_SHIFT, 4, FTR_UNSIGNED, ID_AA64ZFR0_EL1_F32MM_IMP, CAP_HWCAP, KERNEL_HWCAP_SVEF32MM), 2740 HWCAP_CAP(SYS_ID_AA64ZFR0_EL1, ID_AA64ZFR0_EL1_F64MM_SHIFT, 4, FTR_UNSIGNED, ID_AA64ZFR0_EL1_F64MM_IMP, CAP_HWCAP, KERNEL_HWCAP_SVEF64MM), 2741 #endif 2742 HWCAP_CAP(SYS_ID_AA64PFR1_EL1, ID_AA64PFR1_SSBS_SHIFT, 4, FTR_UNSIGNED, ID_AA64PFR1_SSBS_PSTATE_INSNS, CAP_HWCAP, KERNEL_HWCAP_SSBS), 2743 #ifdef CONFIG_ARM64_BTI 2744 HWCAP_CAP(SYS_ID_AA64PFR1_EL1, ID_AA64PFR1_BT_SHIFT, 4, FTR_UNSIGNED, ID_AA64PFR1_BT_BTI, CAP_HWCAP, KERNEL_HWCAP_BTI), 2745 #endif 2746 #ifdef CONFIG_ARM64_PTR_AUTH 2747 HWCAP_MULTI_CAP(ptr_auth_hwcap_addr_matches, CAP_HWCAP, KERNEL_HWCAP_PACA), 2748 HWCAP_MULTI_CAP(ptr_auth_hwcap_gen_matches, CAP_HWCAP, KERNEL_HWCAP_PACG), 2749 #endif 2750 #ifdef CONFIG_ARM64_MTE 2751 HWCAP_CAP(SYS_ID_AA64PFR1_EL1, ID_AA64PFR1_MTE_SHIFT, 4, FTR_UNSIGNED, ID_AA64PFR1_MTE, CAP_HWCAP, KERNEL_HWCAP_MTE), 2752 HWCAP_CAP(SYS_ID_AA64PFR1_EL1, ID_AA64PFR1_MTE_SHIFT, 4, FTR_UNSIGNED, ID_AA64PFR1_MTE_ASYMM, CAP_HWCAP, KERNEL_HWCAP_MTE3), 2753 #endif /* CONFIG_ARM64_MTE */ 2754 HWCAP_CAP(SYS_ID_AA64MMFR0_EL1, ID_AA64MMFR0_ECV_SHIFT, 4, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_ECV), 2755 HWCAP_CAP(SYS_ID_AA64MMFR1_EL1, ID_AA64MMFR1_AFP_SHIFT, 4, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_AFP), 2756 HWCAP_CAP(SYS_ID_AA64ISAR2_EL1, ID_AA64ISAR2_EL1_RPRES_SHIFT, 4, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_RPRES), 2757 HWCAP_CAP(SYS_ID_AA64ISAR2_EL1, ID_AA64ISAR2_EL1_WFxT_SHIFT, 4, FTR_UNSIGNED, ID_AA64ISAR2_EL1_WFxT_IMP, CAP_HWCAP, KERNEL_HWCAP_WFXT), 2758 #ifdef CONFIG_ARM64_SME 2759 HWCAP_CAP(SYS_ID_AA64PFR1_EL1, ID_AA64PFR1_SME_SHIFT, 4, FTR_UNSIGNED, ID_AA64PFR1_SME, CAP_HWCAP, KERNEL_HWCAP_SME), 2760 HWCAP_CAP(SYS_ID_AA64SMFR0_EL1, ID_AA64SMFR0_EL1_FA64_SHIFT, 1, FTR_UNSIGNED, ID_AA64SMFR0_EL1_FA64_IMP, CAP_HWCAP, KERNEL_HWCAP_SME_FA64), 2761 HWCAP_CAP(SYS_ID_AA64SMFR0_EL1, ID_AA64SMFR0_EL1_I16I64_SHIFT, 4, FTR_UNSIGNED, ID_AA64SMFR0_EL1_I16I64_IMP, CAP_HWCAP, KERNEL_HWCAP_SME_I16I64), 2762 HWCAP_CAP(SYS_ID_AA64SMFR0_EL1, ID_AA64SMFR0_EL1_F64F64_SHIFT, 1, FTR_UNSIGNED, ID_AA64SMFR0_EL1_F64F64_IMP, CAP_HWCAP, KERNEL_HWCAP_SME_F64F64), 2763 HWCAP_CAP(SYS_ID_AA64SMFR0_EL1, ID_AA64SMFR0_EL1_I8I32_SHIFT, 4, FTR_UNSIGNED, ID_AA64SMFR0_EL1_I8I32_IMP, CAP_HWCAP, KERNEL_HWCAP_SME_I8I32), 2764 HWCAP_CAP(SYS_ID_AA64SMFR0_EL1, ID_AA64SMFR0_EL1_F16F32_SHIFT, 1, FTR_UNSIGNED, ID_AA64SMFR0_EL1_F16F32_IMP, CAP_HWCAP, KERNEL_HWCAP_SME_F16F32), 2765 HWCAP_CAP(SYS_ID_AA64SMFR0_EL1, ID_AA64SMFR0_EL1_B16F32_SHIFT, 1, FTR_UNSIGNED, ID_AA64SMFR0_EL1_B16F32_IMP, CAP_HWCAP, KERNEL_HWCAP_SME_B16F32), 2766 HWCAP_CAP(SYS_ID_AA64SMFR0_EL1, ID_AA64SMFR0_EL1_F32F32_SHIFT, 1, FTR_UNSIGNED, ID_AA64SMFR0_EL1_F32F32_IMP, CAP_HWCAP, KERNEL_HWCAP_SME_F32F32), 2767 #endif /* CONFIG_ARM64_SME */ 2768 {}, 2769 }; 2770 2771 #ifdef CONFIG_COMPAT 2772 static bool compat_has_neon(const struct arm64_cpu_capabilities *cap, int scope) 2773 { 2774 /* 2775 * Check that all of MVFR1_EL1.{SIMDSP, SIMDInt, SIMDLS} are available, 2776 * in line with that of arm32 as in vfp_init(). We make sure that the 2777 * check is future proof, by making sure value is non-zero. 2778 */ 2779 u32 mvfr1; 2780 2781 WARN_ON(scope == SCOPE_LOCAL_CPU && preemptible()); 2782 if (scope == SCOPE_SYSTEM) 2783 mvfr1 = read_sanitised_ftr_reg(SYS_MVFR1_EL1); 2784 else 2785 mvfr1 = read_sysreg_s(SYS_MVFR1_EL1); 2786 2787 return cpuid_feature_extract_unsigned_field(mvfr1, MVFR1_SIMDSP_SHIFT) && 2788 cpuid_feature_extract_unsigned_field(mvfr1, MVFR1_SIMDINT_SHIFT) && 2789 cpuid_feature_extract_unsigned_field(mvfr1, MVFR1_SIMDLS_SHIFT); 2790 } 2791 #endif 2792 2793 static const struct arm64_cpu_capabilities compat_elf_hwcaps[] = { 2794 #ifdef CONFIG_COMPAT 2795 HWCAP_CAP_MATCH(compat_has_neon, CAP_COMPAT_HWCAP, COMPAT_HWCAP_NEON), 2796 HWCAP_CAP(SYS_MVFR1_EL1, MVFR1_SIMDFMAC_SHIFT, 4, FTR_UNSIGNED, 1, CAP_COMPAT_HWCAP, COMPAT_HWCAP_VFPv4), 2797 /* Arm v8 mandates MVFR0.FPDP == {0, 2}. So, piggy back on this for the presence of VFP support */ 2798 HWCAP_CAP(SYS_MVFR0_EL1, MVFR0_FPDP_SHIFT, 4, FTR_UNSIGNED, 2, CAP_COMPAT_HWCAP, COMPAT_HWCAP_VFP), 2799 HWCAP_CAP(SYS_MVFR0_EL1, MVFR0_FPDP_SHIFT, 4, FTR_UNSIGNED, 2, CAP_COMPAT_HWCAP, COMPAT_HWCAP_VFPv3), 2800 HWCAP_CAP(SYS_ID_ISAR5_EL1, ID_ISAR5_AES_SHIFT, 4, FTR_UNSIGNED, 2, CAP_COMPAT_HWCAP2, COMPAT_HWCAP2_PMULL), 2801 HWCAP_CAP(SYS_ID_ISAR5_EL1, ID_ISAR5_AES_SHIFT, 4, FTR_UNSIGNED, 1, CAP_COMPAT_HWCAP2, COMPAT_HWCAP2_AES), 2802 HWCAP_CAP(SYS_ID_ISAR5_EL1, ID_ISAR5_SHA1_SHIFT, 4, FTR_UNSIGNED, 1, CAP_COMPAT_HWCAP2, COMPAT_HWCAP2_SHA1), 2803 HWCAP_CAP(SYS_ID_ISAR5_EL1, ID_ISAR5_SHA2_SHIFT, 4, FTR_UNSIGNED, 1, CAP_COMPAT_HWCAP2, COMPAT_HWCAP2_SHA2), 2804 HWCAP_CAP(SYS_ID_ISAR5_EL1, ID_ISAR5_CRC32_SHIFT, 4, FTR_UNSIGNED, 1, CAP_COMPAT_HWCAP2, COMPAT_HWCAP2_CRC32), 2805 #endif 2806 {}, 2807 }; 2808 2809 static void cap_set_elf_hwcap(const struct arm64_cpu_capabilities *cap) 2810 { 2811 switch (cap->hwcap_type) { 2812 case CAP_HWCAP: 2813 cpu_set_feature(cap->hwcap); 2814 break; 2815 #ifdef CONFIG_COMPAT 2816 case CAP_COMPAT_HWCAP: 2817 compat_elf_hwcap |= (u32)cap->hwcap; 2818 break; 2819 case CAP_COMPAT_HWCAP2: 2820 compat_elf_hwcap2 |= (u32)cap->hwcap; 2821 break; 2822 #endif 2823 default: 2824 WARN_ON(1); 2825 break; 2826 } 2827 } 2828 2829 /* Check if we have a particular HWCAP enabled */ 2830 static bool cpus_have_elf_hwcap(const struct arm64_cpu_capabilities *cap) 2831 { 2832 bool rc; 2833 2834 switch (cap->hwcap_type) { 2835 case CAP_HWCAP: 2836 rc = cpu_have_feature(cap->hwcap); 2837 break; 2838 #ifdef CONFIG_COMPAT 2839 case CAP_COMPAT_HWCAP: 2840 rc = (compat_elf_hwcap & (u32)cap->hwcap) != 0; 2841 break; 2842 case CAP_COMPAT_HWCAP2: 2843 rc = (compat_elf_hwcap2 & (u32)cap->hwcap) != 0; 2844 break; 2845 #endif 2846 default: 2847 WARN_ON(1); 2848 rc = false; 2849 } 2850 2851 return rc; 2852 } 2853 2854 static void setup_elf_hwcaps(const struct arm64_cpu_capabilities *hwcaps) 2855 { 2856 /* We support emulation of accesses to CPU ID feature registers */ 2857 cpu_set_named_feature(CPUID); 2858 for (; hwcaps->matches; hwcaps++) 2859 if (hwcaps->matches(hwcaps, cpucap_default_scope(hwcaps))) 2860 cap_set_elf_hwcap(hwcaps); 2861 } 2862 2863 static void update_cpu_capabilities(u16 scope_mask) 2864 { 2865 int i; 2866 const struct arm64_cpu_capabilities *caps; 2867 2868 scope_mask &= ARM64_CPUCAP_SCOPE_MASK; 2869 for (i = 0; i < ARM64_NCAPS; i++) { 2870 caps = cpu_hwcaps_ptrs[i]; 2871 if (!caps || !(caps->type & scope_mask) || 2872 cpus_have_cap(caps->capability) || 2873 !caps->matches(caps, cpucap_default_scope(caps))) 2874 continue; 2875 2876 if (caps->desc) 2877 pr_info("detected: %s\n", caps->desc); 2878 cpus_set_cap(caps->capability); 2879 2880 if ((scope_mask & SCOPE_BOOT_CPU) && (caps->type & SCOPE_BOOT_CPU)) 2881 set_bit(caps->capability, boot_capabilities); 2882 } 2883 } 2884 2885 /* 2886 * Enable all the available capabilities on this CPU. The capabilities 2887 * with BOOT_CPU scope are handled separately and hence skipped here. 2888 */ 2889 static int cpu_enable_non_boot_scope_capabilities(void *__unused) 2890 { 2891 int i; 2892 u16 non_boot_scope = SCOPE_ALL & ~SCOPE_BOOT_CPU; 2893 2894 for_each_available_cap(i) { 2895 const struct arm64_cpu_capabilities *cap = cpu_hwcaps_ptrs[i]; 2896 2897 if (WARN_ON(!cap)) 2898 continue; 2899 2900 if (!(cap->type & non_boot_scope)) 2901 continue; 2902 2903 if (cap->cpu_enable) 2904 cap->cpu_enable(cap); 2905 } 2906 return 0; 2907 } 2908 2909 /* 2910 * Run through the enabled capabilities and enable() it on all active 2911 * CPUs 2912 */ 2913 static void __init enable_cpu_capabilities(u16 scope_mask) 2914 { 2915 int i; 2916 const struct arm64_cpu_capabilities *caps; 2917 bool boot_scope; 2918 2919 scope_mask &= ARM64_CPUCAP_SCOPE_MASK; 2920 boot_scope = !!(scope_mask & SCOPE_BOOT_CPU); 2921 2922 for (i = 0; i < ARM64_NCAPS; i++) { 2923 unsigned int num; 2924 2925 caps = cpu_hwcaps_ptrs[i]; 2926 if (!caps || !(caps->type & scope_mask)) 2927 continue; 2928 num = caps->capability; 2929 if (!cpus_have_cap(num)) 2930 continue; 2931 2932 /* Ensure cpus_have_const_cap(num) works */ 2933 static_branch_enable(&cpu_hwcap_keys[num]); 2934 2935 if (boot_scope && caps->cpu_enable) 2936 /* 2937 * Capabilities with SCOPE_BOOT_CPU scope are finalised 2938 * before any secondary CPU boots. Thus, each secondary 2939 * will enable the capability as appropriate via 2940 * check_local_cpu_capabilities(). The only exception is 2941 * the boot CPU, for which the capability must be 2942 * enabled here. This approach avoids costly 2943 * stop_machine() calls for this case. 2944 */ 2945 caps->cpu_enable(caps); 2946 } 2947 2948 /* 2949 * For all non-boot scope capabilities, use stop_machine() 2950 * as it schedules the work allowing us to modify PSTATE, 2951 * instead of on_each_cpu() which uses an IPI, giving us a 2952 * PSTATE that disappears when we return. 2953 */ 2954 if (!boot_scope) 2955 stop_machine(cpu_enable_non_boot_scope_capabilities, 2956 NULL, cpu_online_mask); 2957 } 2958 2959 /* 2960 * Run through the list of capabilities to check for conflicts. 2961 * If the system has already detected a capability, take necessary 2962 * action on this CPU. 2963 */ 2964 static void verify_local_cpu_caps(u16 scope_mask) 2965 { 2966 int i; 2967 bool cpu_has_cap, system_has_cap; 2968 const struct arm64_cpu_capabilities *caps; 2969 2970 scope_mask &= ARM64_CPUCAP_SCOPE_MASK; 2971 2972 for (i = 0; i < ARM64_NCAPS; i++) { 2973 caps = cpu_hwcaps_ptrs[i]; 2974 if (!caps || !(caps->type & scope_mask)) 2975 continue; 2976 2977 cpu_has_cap = caps->matches(caps, SCOPE_LOCAL_CPU); 2978 system_has_cap = cpus_have_cap(caps->capability); 2979 2980 if (system_has_cap) { 2981 /* 2982 * Check if the new CPU misses an advertised feature, 2983 * which is not safe to miss. 2984 */ 2985 if (!cpu_has_cap && !cpucap_late_cpu_optional(caps)) 2986 break; 2987 /* 2988 * We have to issue cpu_enable() irrespective of 2989 * whether the CPU has it or not, as it is enabeld 2990 * system wide. It is upto the call back to take 2991 * appropriate action on this CPU. 2992 */ 2993 if (caps->cpu_enable) 2994 caps->cpu_enable(caps); 2995 } else { 2996 /* 2997 * Check if the CPU has this capability if it isn't 2998 * safe to have when the system doesn't. 2999 */ 3000 if (cpu_has_cap && !cpucap_late_cpu_permitted(caps)) 3001 break; 3002 } 3003 } 3004 3005 if (i < ARM64_NCAPS) { 3006 pr_crit("CPU%d: Detected conflict for capability %d (%s), System: %d, CPU: %d\n", 3007 smp_processor_id(), caps->capability, 3008 caps->desc, system_has_cap, cpu_has_cap); 3009 3010 if (cpucap_panic_on_conflict(caps)) 3011 cpu_panic_kernel(); 3012 else 3013 cpu_die_early(); 3014 } 3015 } 3016 3017 /* 3018 * Check for CPU features that are used in early boot 3019 * based on the Boot CPU value. 3020 */ 3021 static void check_early_cpu_features(void) 3022 { 3023 verify_cpu_asid_bits(); 3024 3025 verify_local_cpu_caps(SCOPE_BOOT_CPU); 3026 } 3027 3028 static void 3029 __verify_local_elf_hwcaps(const struct arm64_cpu_capabilities *caps) 3030 { 3031 3032 for (; caps->matches; caps++) 3033 if (cpus_have_elf_hwcap(caps) && !caps->matches(caps, SCOPE_LOCAL_CPU)) { 3034 pr_crit("CPU%d: missing HWCAP: %s\n", 3035 smp_processor_id(), caps->desc); 3036 cpu_die_early(); 3037 } 3038 } 3039 3040 static void verify_local_elf_hwcaps(void) 3041 { 3042 __verify_local_elf_hwcaps(arm64_elf_hwcaps); 3043 3044 if (id_aa64pfr0_32bit_el0(read_cpuid(ID_AA64PFR0_EL1))) 3045 __verify_local_elf_hwcaps(compat_elf_hwcaps); 3046 } 3047 3048 static void verify_sve_features(void) 3049 { 3050 u64 safe_zcr = read_sanitised_ftr_reg(SYS_ZCR_EL1); 3051 u64 zcr = read_zcr_features(); 3052 3053 unsigned int safe_len = safe_zcr & ZCR_ELx_LEN_MASK; 3054 unsigned int len = zcr & ZCR_ELx_LEN_MASK; 3055 3056 if (len < safe_len || vec_verify_vq_map(ARM64_VEC_SVE)) { 3057 pr_crit("CPU%d: SVE: vector length support mismatch\n", 3058 smp_processor_id()); 3059 cpu_die_early(); 3060 } 3061 3062 /* Add checks on other ZCR bits here if necessary */ 3063 } 3064 3065 static void verify_sme_features(void) 3066 { 3067 u64 safe_smcr = read_sanitised_ftr_reg(SYS_SMCR_EL1); 3068 u64 smcr = read_smcr_features(); 3069 3070 unsigned int safe_len = safe_smcr & SMCR_ELx_LEN_MASK; 3071 unsigned int len = smcr & SMCR_ELx_LEN_MASK; 3072 3073 if (len < safe_len || vec_verify_vq_map(ARM64_VEC_SME)) { 3074 pr_crit("CPU%d: SME: vector length support mismatch\n", 3075 smp_processor_id()); 3076 cpu_die_early(); 3077 } 3078 3079 /* Add checks on other SMCR bits here if necessary */ 3080 } 3081 3082 static void verify_hyp_capabilities(void) 3083 { 3084 u64 safe_mmfr1, mmfr0, mmfr1; 3085 int parange, ipa_max; 3086 unsigned int safe_vmid_bits, vmid_bits; 3087 3088 if (!IS_ENABLED(CONFIG_KVM)) 3089 return; 3090 3091 safe_mmfr1 = read_sanitised_ftr_reg(SYS_ID_AA64MMFR1_EL1); 3092 mmfr0 = read_cpuid(ID_AA64MMFR0_EL1); 3093 mmfr1 = read_cpuid(ID_AA64MMFR1_EL1); 3094 3095 /* Verify VMID bits */ 3096 safe_vmid_bits = get_vmid_bits(safe_mmfr1); 3097 vmid_bits = get_vmid_bits(mmfr1); 3098 if (vmid_bits < safe_vmid_bits) { 3099 pr_crit("CPU%d: VMID width mismatch\n", smp_processor_id()); 3100 cpu_die_early(); 3101 } 3102 3103 /* Verify IPA range */ 3104 parange = cpuid_feature_extract_unsigned_field(mmfr0, 3105 ID_AA64MMFR0_PARANGE_SHIFT); 3106 ipa_max = id_aa64mmfr0_parange_to_phys_shift(parange); 3107 if (ipa_max < get_kvm_ipa_limit()) { 3108 pr_crit("CPU%d: IPA range mismatch\n", smp_processor_id()); 3109 cpu_die_early(); 3110 } 3111 } 3112 3113 /* 3114 * Run through the enabled system capabilities and enable() it on this CPU. 3115 * The capabilities were decided based on the available CPUs at the boot time. 3116 * Any new CPU should match the system wide status of the capability. If the 3117 * new CPU doesn't have a capability which the system now has enabled, we 3118 * cannot do anything to fix it up and could cause unexpected failures. So 3119 * we park the CPU. 3120 */ 3121 static void verify_local_cpu_capabilities(void) 3122 { 3123 /* 3124 * The capabilities with SCOPE_BOOT_CPU are checked from 3125 * check_early_cpu_features(), as they need to be verified 3126 * on all secondary CPUs. 3127 */ 3128 verify_local_cpu_caps(SCOPE_ALL & ~SCOPE_BOOT_CPU); 3129 verify_local_elf_hwcaps(); 3130 3131 if (system_supports_sve()) 3132 verify_sve_features(); 3133 3134 if (system_supports_sme()) 3135 verify_sme_features(); 3136 3137 if (is_hyp_mode_available()) 3138 verify_hyp_capabilities(); 3139 } 3140 3141 void check_local_cpu_capabilities(void) 3142 { 3143 /* 3144 * All secondary CPUs should conform to the early CPU features 3145 * in use by the kernel based on boot CPU. 3146 */ 3147 check_early_cpu_features(); 3148 3149 /* 3150 * If we haven't finalised the system capabilities, this CPU gets 3151 * a chance to update the errata work arounds and local features. 3152 * Otherwise, this CPU should verify that it has all the system 3153 * advertised capabilities. 3154 */ 3155 if (!system_capabilities_finalized()) 3156 update_cpu_capabilities(SCOPE_LOCAL_CPU); 3157 else 3158 verify_local_cpu_capabilities(); 3159 } 3160 3161 static void __init setup_boot_cpu_capabilities(void) 3162 { 3163 /* Detect capabilities with either SCOPE_BOOT_CPU or SCOPE_LOCAL_CPU */ 3164 update_cpu_capabilities(SCOPE_BOOT_CPU | SCOPE_LOCAL_CPU); 3165 /* Enable the SCOPE_BOOT_CPU capabilities alone right away */ 3166 enable_cpu_capabilities(SCOPE_BOOT_CPU); 3167 } 3168 3169 bool this_cpu_has_cap(unsigned int n) 3170 { 3171 if (!WARN_ON(preemptible()) && n < ARM64_NCAPS) { 3172 const struct arm64_cpu_capabilities *cap = cpu_hwcaps_ptrs[n]; 3173 3174 if (cap) 3175 return cap->matches(cap, SCOPE_LOCAL_CPU); 3176 } 3177 3178 return false; 3179 } 3180 EXPORT_SYMBOL_GPL(this_cpu_has_cap); 3181 3182 /* 3183 * This helper function is used in a narrow window when, 3184 * - The system wide safe registers are set with all the SMP CPUs and, 3185 * - The SYSTEM_FEATURE cpu_hwcaps may not have been set. 3186 * In all other cases cpus_have_{const_}cap() should be used. 3187 */ 3188 static bool __maybe_unused __system_matches_cap(unsigned int n) 3189 { 3190 if (n < ARM64_NCAPS) { 3191 const struct arm64_cpu_capabilities *cap = cpu_hwcaps_ptrs[n]; 3192 3193 if (cap) 3194 return cap->matches(cap, SCOPE_SYSTEM); 3195 } 3196 return false; 3197 } 3198 3199 void cpu_set_feature(unsigned int num) 3200 { 3201 set_bit(num, elf_hwcap); 3202 } 3203 3204 bool cpu_have_feature(unsigned int num) 3205 { 3206 return test_bit(num, elf_hwcap); 3207 } 3208 EXPORT_SYMBOL_GPL(cpu_have_feature); 3209 3210 unsigned long cpu_get_elf_hwcap(void) 3211 { 3212 /* 3213 * We currently only populate the first 32 bits of AT_HWCAP. Please 3214 * note that for userspace compatibility we guarantee that bits 62 3215 * and 63 will always be returned as 0. 3216 */ 3217 return elf_hwcap[0]; 3218 } 3219 3220 unsigned long cpu_get_elf_hwcap2(void) 3221 { 3222 return elf_hwcap[1]; 3223 } 3224 3225 static void __init setup_system_capabilities(void) 3226 { 3227 /* 3228 * We have finalised the system-wide safe feature 3229 * registers, finalise the capabilities that depend 3230 * on it. Also enable all the available capabilities, 3231 * that are not enabled already. 3232 */ 3233 update_cpu_capabilities(SCOPE_SYSTEM); 3234 enable_cpu_capabilities(SCOPE_ALL & ~SCOPE_BOOT_CPU); 3235 } 3236 3237 void __init setup_cpu_features(void) 3238 { 3239 u32 cwg; 3240 3241 setup_system_capabilities(); 3242 setup_elf_hwcaps(arm64_elf_hwcaps); 3243 3244 if (system_supports_32bit_el0()) { 3245 setup_elf_hwcaps(compat_elf_hwcaps); 3246 elf_hwcap_fixup(); 3247 } 3248 3249 if (system_uses_ttbr0_pan()) 3250 pr_info("emulated: Privileged Access Never (PAN) using TTBR0_EL1 switching\n"); 3251 3252 sve_setup(); 3253 sme_setup(); 3254 minsigstksz_setup(); 3255 3256 /* Advertise that we have computed the system capabilities */ 3257 finalize_system_capabilities(); 3258 3259 /* 3260 * Check for sane CTR_EL0.CWG value. 3261 */ 3262 cwg = cache_type_cwg(); 3263 if (!cwg) 3264 pr_warn("No Cache Writeback Granule information, assuming %d\n", 3265 ARCH_DMA_MINALIGN); 3266 } 3267 3268 static int enable_mismatched_32bit_el0(unsigned int cpu) 3269 { 3270 /* 3271 * The first 32-bit-capable CPU we detected and so can no longer 3272 * be offlined by userspace. -1 indicates we haven't yet onlined 3273 * a 32-bit-capable CPU. 3274 */ 3275 static int lucky_winner = -1; 3276 3277 struct cpuinfo_arm64 *info = &per_cpu(cpu_data, cpu); 3278 bool cpu_32bit = id_aa64pfr0_32bit_el0(info->reg_id_aa64pfr0); 3279 3280 if (cpu_32bit) { 3281 cpumask_set_cpu(cpu, cpu_32bit_el0_mask); 3282 static_branch_enable_cpuslocked(&arm64_mismatched_32bit_el0); 3283 } 3284 3285 if (cpumask_test_cpu(0, cpu_32bit_el0_mask) == cpu_32bit) 3286 return 0; 3287 3288 if (lucky_winner >= 0) 3289 return 0; 3290 3291 /* 3292 * We've detected a mismatch. We need to keep one of our CPUs with 3293 * 32-bit EL0 online so that is_cpu_allowed() doesn't end up rejecting 3294 * every CPU in the system for a 32-bit task. 3295 */ 3296 lucky_winner = cpu_32bit ? cpu : cpumask_any_and(cpu_32bit_el0_mask, 3297 cpu_active_mask); 3298 get_cpu_device(lucky_winner)->offline_disabled = true; 3299 setup_elf_hwcaps(compat_elf_hwcaps); 3300 elf_hwcap_fixup(); 3301 pr_info("Asymmetric 32-bit EL0 support detected on CPU %u; CPU hot-unplug disabled on CPU %u\n", 3302 cpu, lucky_winner); 3303 return 0; 3304 } 3305 3306 static int __init init_32bit_el0_mask(void) 3307 { 3308 if (!allow_mismatched_32bit_el0) 3309 return 0; 3310 3311 if (!zalloc_cpumask_var(&cpu_32bit_el0_mask, GFP_KERNEL)) 3312 return -ENOMEM; 3313 3314 return cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, 3315 "arm64/mismatched_32bit_el0:online", 3316 enable_mismatched_32bit_el0, NULL); 3317 } 3318 subsys_initcall_sync(init_32bit_el0_mask); 3319 3320 static void __maybe_unused cpu_enable_cnp(struct arm64_cpu_capabilities const *cap) 3321 { 3322 cpu_replace_ttbr1(lm_alias(swapper_pg_dir), idmap_pg_dir); 3323 } 3324 3325 /* 3326 * We emulate only the following system register space. 3327 * Op0 = 0x3, CRn = 0x0, Op1 = 0x0, CRm = [0, 4 - 7] 3328 * See Table C5-6 System instruction encodings for System register accesses, 3329 * ARMv8 ARM(ARM DDI 0487A.f) for more details. 3330 */ 3331 static inline bool __attribute_const__ is_emulated(u32 id) 3332 { 3333 return (sys_reg_Op0(id) == 0x3 && 3334 sys_reg_CRn(id) == 0x0 && 3335 sys_reg_Op1(id) == 0x0 && 3336 (sys_reg_CRm(id) == 0 || 3337 ((sys_reg_CRm(id) >= 4) && (sys_reg_CRm(id) <= 7)))); 3338 } 3339 3340 /* 3341 * With CRm == 0, reg should be one of : 3342 * MIDR_EL1, MPIDR_EL1 or REVIDR_EL1. 3343 */ 3344 static inline int emulate_id_reg(u32 id, u64 *valp) 3345 { 3346 switch (id) { 3347 case SYS_MIDR_EL1: 3348 *valp = read_cpuid_id(); 3349 break; 3350 case SYS_MPIDR_EL1: 3351 *valp = SYS_MPIDR_SAFE_VAL; 3352 break; 3353 case SYS_REVIDR_EL1: 3354 /* IMPLEMENTATION DEFINED values are emulated with 0 */ 3355 *valp = 0; 3356 break; 3357 default: 3358 return -EINVAL; 3359 } 3360 3361 return 0; 3362 } 3363 3364 static int emulate_sys_reg(u32 id, u64 *valp) 3365 { 3366 struct arm64_ftr_reg *regp; 3367 3368 if (!is_emulated(id)) 3369 return -EINVAL; 3370 3371 if (sys_reg_CRm(id) == 0) 3372 return emulate_id_reg(id, valp); 3373 3374 regp = get_arm64_ftr_reg_nowarn(id); 3375 if (regp) 3376 *valp = arm64_ftr_reg_user_value(regp); 3377 else 3378 /* 3379 * The untracked registers are either IMPLEMENTATION DEFINED 3380 * (e.g, ID_AFR0_EL1) or reserved RAZ. 3381 */ 3382 *valp = 0; 3383 return 0; 3384 } 3385 3386 int do_emulate_mrs(struct pt_regs *regs, u32 sys_reg, u32 rt) 3387 { 3388 int rc; 3389 u64 val; 3390 3391 rc = emulate_sys_reg(sys_reg, &val); 3392 if (!rc) { 3393 pt_regs_write_reg(regs, rt, val); 3394 arm64_skip_faulting_instruction(regs, AARCH64_INSN_SIZE); 3395 } 3396 return rc; 3397 } 3398 3399 static int emulate_mrs(struct pt_regs *regs, u32 insn) 3400 { 3401 u32 sys_reg, rt; 3402 3403 /* 3404 * sys_reg values are defined as used in mrs/msr instruction. 3405 * shift the imm value to get the encoding. 3406 */ 3407 sys_reg = (u32)aarch64_insn_decode_immediate(AARCH64_INSN_IMM_16, insn) << 5; 3408 rt = aarch64_insn_decode_register(AARCH64_INSN_REGTYPE_RT, insn); 3409 return do_emulate_mrs(regs, sys_reg, rt); 3410 } 3411 3412 static struct undef_hook mrs_hook = { 3413 .instr_mask = 0xffff0000, 3414 .instr_val = 0xd5380000, 3415 .pstate_mask = PSR_AA32_MODE_MASK, 3416 .pstate_val = PSR_MODE_EL0t, 3417 .fn = emulate_mrs, 3418 }; 3419 3420 static int __init enable_mrs_emulation(void) 3421 { 3422 register_undef_hook(&mrs_hook); 3423 return 0; 3424 } 3425 3426 core_initcall(enable_mrs_emulation); 3427 3428 enum mitigation_state arm64_get_meltdown_state(void) 3429 { 3430 if (__meltdown_safe) 3431 return SPECTRE_UNAFFECTED; 3432 3433 if (arm64_kernel_unmapped_at_el0()) 3434 return SPECTRE_MITIGATED; 3435 3436 return SPECTRE_VULNERABLE; 3437 } 3438 3439 ssize_t cpu_show_meltdown(struct device *dev, struct device_attribute *attr, 3440 char *buf) 3441 { 3442 switch (arm64_get_meltdown_state()) { 3443 case SPECTRE_UNAFFECTED: 3444 return sprintf(buf, "Not affected\n"); 3445 3446 case SPECTRE_MITIGATED: 3447 return sprintf(buf, "Mitigation: PTI\n"); 3448 3449 default: 3450 return sprintf(buf, "Vulnerable\n"); 3451 } 3452 } 3453