1 /* 2 * Contains CPU feature definitions 3 * 4 * Copyright (C) 2015 ARM Ltd. 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program. If not, see <http://www.gnu.org/licenses/>. 17 */ 18 19 #define pr_fmt(fmt) "CPU features: " fmt 20 21 #include <linux/bsearch.h> 22 #include <linux/sort.h> 23 #include <linux/types.h> 24 #include <asm/cpu.h> 25 #include <asm/cpufeature.h> 26 #include <asm/cpu_ops.h> 27 #include <asm/mmu_context.h> 28 #include <asm/processor.h> 29 #include <asm/sysreg.h> 30 #include <asm/virt.h> 31 32 unsigned long elf_hwcap __read_mostly; 33 EXPORT_SYMBOL_GPL(elf_hwcap); 34 35 #ifdef CONFIG_COMPAT 36 #define COMPAT_ELF_HWCAP_DEFAULT \ 37 (COMPAT_HWCAP_HALF|COMPAT_HWCAP_THUMB|\ 38 COMPAT_HWCAP_FAST_MULT|COMPAT_HWCAP_EDSP|\ 39 COMPAT_HWCAP_TLS|COMPAT_HWCAP_VFP|\ 40 COMPAT_HWCAP_VFPv3|COMPAT_HWCAP_VFPv4|\ 41 COMPAT_HWCAP_NEON|COMPAT_HWCAP_IDIV|\ 42 COMPAT_HWCAP_LPAE) 43 unsigned int compat_elf_hwcap __read_mostly = COMPAT_ELF_HWCAP_DEFAULT; 44 unsigned int compat_elf_hwcap2 __read_mostly; 45 #endif 46 47 DECLARE_BITMAP(cpu_hwcaps, ARM64_NCAPS); 48 49 #define __ARM64_FTR_BITS(SIGNED, STRICT, TYPE, SHIFT, WIDTH, SAFE_VAL) \ 50 { \ 51 .sign = SIGNED, \ 52 .strict = STRICT, \ 53 .type = TYPE, \ 54 .shift = SHIFT, \ 55 .width = WIDTH, \ 56 .safe_val = SAFE_VAL, \ 57 } 58 59 /* Define a feature with unsigned values */ 60 #define ARM64_FTR_BITS(STRICT, TYPE, SHIFT, WIDTH, SAFE_VAL) \ 61 __ARM64_FTR_BITS(FTR_UNSIGNED, STRICT, TYPE, SHIFT, WIDTH, SAFE_VAL) 62 63 /* Define a feature with a signed value */ 64 #define S_ARM64_FTR_BITS(STRICT, TYPE, SHIFT, WIDTH, SAFE_VAL) \ 65 __ARM64_FTR_BITS(FTR_SIGNED, STRICT, TYPE, SHIFT, WIDTH, SAFE_VAL) 66 67 #define ARM64_FTR_END \ 68 { \ 69 .width = 0, \ 70 } 71 72 /* meta feature for alternatives */ 73 static bool __maybe_unused 74 cpufeature_pan_not_uao(const struct arm64_cpu_capabilities *entry, int __unused); 75 76 77 static struct arm64_ftr_bits ftr_id_aa64isar0[] = { 78 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 32, 32, 0), 79 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, ID_AA64ISAR0_RDM_SHIFT, 4, 0), 80 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 24, 4, 0), 81 ARM64_FTR_BITS(FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_ATOMICS_SHIFT, 4, 0), 82 ARM64_FTR_BITS(FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_CRC32_SHIFT, 4, 0), 83 ARM64_FTR_BITS(FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_SHA2_SHIFT, 4, 0), 84 ARM64_FTR_BITS(FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_SHA1_SHIFT, 4, 0), 85 ARM64_FTR_BITS(FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_AES_SHIFT, 4, 0), 86 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 0, 4, 0), /* RAZ */ 87 ARM64_FTR_END, 88 }; 89 90 static struct arm64_ftr_bits ftr_id_aa64pfr0[] = { 91 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 32, 32, 0), 92 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 28, 4, 0), 93 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, ID_AA64PFR0_GIC_SHIFT, 4, 0), 94 S_ARM64_FTR_BITS(FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR0_ASIMD_SHIFT, 4, ID_AA64PFR0_ASIMD_NI), 95 S_ARM64_FTR_BITS(FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR0_FP_SHIFT, 4, ID_AA64PFR0_FP_NI), 96 /* Linux doesn't care about the EL3 */ 97 ARM64_FTR_BITS(FTR_NONSTRICT, FTR_EXACT, ID_AA64PFR0_EL3_SHIFT, 4, 0), 98 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, ID_AA64PFR0_EL2_SHIFT, 4, 0), 99 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, ID_AA64PFR0_EL1_SHIFT, 4, ID_AA64PFR0_EL1_64BIT_ONLY), 100 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, ID_AA64PFR0_EL0_SHIFT, 4, ID_AA64PFR0_EL0_64BIT_ONLY), 101 ARM64_FTR_END, 102 }; 103 104 static struct arm64_ftr_bits ftr_id_aa64mmfr0[] = { 105 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 32, 32, 0), 106 S_ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, ID_AA64MMFR0_TGRAN4_SHIFT, 4, ID_AA64MMFR0_TGRAN4_NI), 107 S_ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, ID_AA64MMFR0_TGRAN64_SHIFT, 4, ID_AA64MMFR0_TGRAN64_NI), 108 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, ID_AA64MMFR0_TGRAN16_SHIFT, 4, ID_AA64MMFR0_TGRAN16_NI), 109 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, ID_AA64MMFR0_BIGENDEL0_SHIFT, 4, 0), 110 /* Linux shouldn't care about secure memory */ 111 ARM64_FTR_BITS(FTR_NONSTRICT, FTR_EXACT, ID_AA64MMFR0_SNSMEM_SHIFT, 4, 0), 112 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, ID_AA64MMFR0_BIGENDEL_SHIFT, 4, 0), 113 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, ID_AA64MMFR0_ASID_SHIFT, 4, 0), 114 /* 115 * Differing PARange is fine as long as all peripherals and memory are mapped 116 * within the minimum PARange of all CPUs 117 */ 118 ARM64_FTR_BITS(FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_PARANGE_SHIFT, 4, 0), 119 ARM64_FTR_END, 120 }; 121 122 static struct arm64_ftr_bits ftr_id_aa64mmfr1[] = { 123 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 32, 32, 0), 124 ARM64_FTR_BITS(FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_PAN_SHIFT, 4, 0), 125 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, ID_AA64MMFR1_LOR_SHIFT, 4, 0), 126 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, ID_AA64MMFR1_HPD_SHIFT, 4, 0), 127 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, ID_AA64MMFR1_VHE_SHIFT, 4, 0), 128 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, ID_AA64MMFR1_VMIDBITS_SHIFT, 4, 0), 129 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, ID_AA64MMFR1_HADBS_SHIFT, 4, 0), 130 ARM64_FTR_END, 131 }; 132 133 static struct arm64_ftr_bits ftr_id_aa64mmfr2[] = { 134 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, ID_AA64MMFR2_LVA_SHIFT, 4, 0), 135 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, ID_AA64MMFR2_IESB_SHIFT, 4, 0), 136 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, ID_AA64MMFR2_LSM_SHIFT, 4, 0), 137 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, ID_AA64MMFR2_UAO_SHIFT, 4, 0), 138 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, ID_AA64MMFR2_CNP_SHIFT, 4, 0), 139 ARM64_FTR_END, 140 }; 141 142 static struct arm64_ftr_bits ftr_ctr[] = { 143 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 31, 1, 1), /* RAO */ 144 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 28, 3, 0), 145 ARM64_FTR_BITS(FTR_STRICT, FTR_HIGHER_SAFE, 24, 4, 0), /* CWG */ 146 ARM64_FTR_BITS(FTR_STRICT, FTR_LOWER_SAFE, 20, 4, 0), /* ERG */ 147 ARM64_FTR_BITS(FTR_STRICT, FTR_LOWER_SAFE, 16, 4, 1), /* DminLine */ 148 /* 149 * Linux can handle differing I-cache policies. Userspace JITs will 150 * make use of *minLine 151 */ 152 ARM64_FTR_BITS(FTR_NONSTRICT, FTR_EXACT, 14, 2, 0), /* L1Ip */ 153 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 4, 10, 0), /* RAZ */ 154 ARM64_FTR_BITS(FTR_STRICT, FTR_LOWER_SAFE, 0, 4, 0), /* IminLine */ 155 ARM64_FTR_END, 156 }; 157 158 static struct arm64_ftr_bits ftr_id_mmfr0[] = { 159 S_ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 28, 4, 0xf), /* InnerShr */ 160 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 24, 4, 0), /* FCSE */ 161 ARM64_FTR_BITS(FTR_NONSTRICT, FTR_LOWER_SAFE, 20, 4, 0), /* AuxReg */ 162 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 16, 4, 0), /* TCM */ 163 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 12, 4, 0), /* ShareLvl */ 164 S_ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 8, 4, 0xf), /* OuterShr */ 165 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 4, 4, 0), /* PMSA */ 166 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 0, 4, 0), /* VMSA */ 167 ARM64_FTR_END, 168 }; 169 170 static struct arm64_ftr_bits ftr_id_aa64dfr0[] = { 171 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 32, 32, 0), 172 ARM64_FTR_BITS(FTR_STRICT, FTR_LOWER_SAFE, ID_AA64DFR0_CTX_CMPS_SHIFT, 4, 0), 173 ARM64_FTR_BITS(FTR_STRICT, FTR_LOWER_SAFE, ID_AA64DFR0_WRPS_SHIFT, 4, 0), 174 ARM64_FTR_BITS(FTR_STRICT, FTR_LOWER_SAFE, ID_AA64DFR0_BRPS_SHIFT, 4, 0), 175 S_ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, ID_AA64DFR0_PMUVER_SHIFT, 4, 0), 176 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, ID_AA64DFR0_TRACEVER_SHIFT, 4, 0), 177 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, ID_AA64DFR0_DEBUGVER_SHIFT, 4, 0x6), 178 ARM64_FTR_END, 179 }; 180 181 static struct arm64_ftr_bits ftr_mvfr2[] = { 182 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 8, 24, 0), /* RAZ */ 183 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 4, 4, 0), /* FPMisc */ 184 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 0, 4, 0), /* SIMDMisc */ 185 ARM64_FTR_END, 186 }; 187 188 static struct arm64_ftr_bits ftr_dczid[] = { 189 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 5, 27, 0), /* RAZ */ 190 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 4, 1, 1), /* DZP */ 191 ARM64_FTR_BITS(FTR_STRICT, FTR_LOWER_SAFE, 0, 4, 0), /* BS */ 192 ARM64_FTR_END, 193 }; 194 195 196 static struct arm64_ftr_bits ftr_id_isar5[] = { 197 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, ID_ISAR5_RDM_SHIFT, 4, 0), 198 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 20, 4, 0), /* RAZ */ 199 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, ID_ISAR5_CRC32_SHIFT, 4, 0), 200 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, ID_ISAR5_SHA2_SHIFT, 4, 0), 201 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, ID_ISAR5_SHA1_SHIFT, 4, 0), 202 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, ID_ISAR5_AES_SHIFT, 4, 0), 203 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, ID_ISAR5_SEVL_SHIFT, 4, 0), 204 ARM64_FTR_END, 205 }; 206 207 static struct arm64_ftr_bits ftr_id_mmfr4[] = { 208 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 8, 24, 0), /* RAZ */ 209 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 4, 4, 0), /* ac2 */ 210 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 0, 4, 0), /* RAZ */ 211 ARM64_FTR_END, 212 }; 213 214 static struct arm64_ftr_bits ftr_id_pfr0[] = { 215 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 16, 16, 0), /* RAZ */ 216 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 12, 4, 0), /* State3 */ 217 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 8, 4, 0), /* State2 */ 218 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 4, 4, 0), /* State1 */ 219 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 0, 4, 0), /* State0 */ 220 ARM64_FTR_END, 221 }; 222 223 static struct arm64_ftr_bits ftr_id_dfr0[] = { 224 ARM64_FTR_BITS(FTR_STRICT, FTR_LOWER_SAFE, 28, 4, 0), 225 S_ARM64_FTR_BITS(FTR_STRICT, FTR_LOWER_SAFE, 24, 4, 0xf), /* PerfMon */ 226 ARM64_FTR_BITS(FTR_STRICT, FTR_LOWER_SAFE, 20, 4, 0), 227 ARM64_FTR_BITS(FTR_STRICT, FTR_LOWER_SAFE, 16, 4, 0), 228 ARM64_FTR_BITS(FTR_STRICT, FTR_LOWER_SAFE, 12, 4, 0), 229 ARM64_FTR_BITS(FTR_STRICT, FTR_LOWER_SAFE, 8, 4, 0), 230 ARM64_FTR_BITS(FTR_STRICT, FTR_LOWER_SAFE, 4, 4, 0), 231 ARM64_FTR_BITS(FTR_STRICT, FTR_LOWER_SAFE, 0, 4, 0), 232 ARM64_FTR_END, 233 }; 234 235 /* 236 * Common ftr bits for a 32bit register with all hidden, strict 237 * attributes, with 4bit feature fields and a default safe value of 238 * 0. Covers the following 32bit registers: 239 * id_isar[0-4], id_mmfr[1-3], id_pfr1, mvfr[0-1] 240 */ 241 static struct arm64_ftr_bits ftr_generic_32bits[] = { 242 ARM64_FTR_BITS(FTR_STRICT, FTR_LOWER_SAFE, 28, 4, 0), 243 ARM64_FTR_BITS(FTR_STRICT, FTR_LOWER_SAFE, 24, 4, 0), 244 ARM64_FTR_BITS(FTR_STRICT, FTR_LOWER_SAFE, 20, 4, 0), 245 ARM64_FTR_BITS(FTR_STRICT, FTR_LOWER_SAFE, 16, 4, 0), 246 ARM64_FTR_BITS(FTR_STRICT, FTR_LOWER_SAFE, 12, 4, 0), 247 ARM64_FTR_BITS(FTR_STRICT, FTR_LOWER_SAFE, 8, 4, 0), 248 ARM64_FTR_BITS(FTR_STRICT, FTR_LOWER_SAFE, 4, 4, 0), 249 ARM64_FTR_BITS(FTR_STRICT, FTR_LOWER_SAFE, 0, 4, 0), 250 ARM64_FTR_END, 251 }; 252 253 static struct arm64_ftr_bits ftr_generic[] = { 254 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 0, 64, 0), 255 ARM64_FTR_END, 256 }; 257 258 static struct arm64_ftr_bits ftr_generic32[] = { 259 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 0, 32, 0), 260 ARM64_FTR_END, 261 }; 262 263 static struct arm64_ftr_bits ftr_aa64raz[] = { 264 ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 0, 64, 0), 265 ARM64_FTR_END, 266 }; 267 268 #define ARM64_FTR_REG(id, table) \ 269 { \ 270 .sys_id = id, \ 271 .name = #id, \ 272 .ftr_bits = &((table)[0]), \ 273 } 274 275 static struct arm64_ftr_reg arm64_ftr_regs[] = { 276 277 /* Op1 = 0, CRn = 0, CRm = 1 */ 278 ARM64_FTR_REG(SYS_ID_PFR0_EL1, ftr_id_pfr0), 279 ARM64_FTR_REG(SYS_ID_PFR1_EL1, ftr_generic_32bits), 280 ARM64_FTR_REG(SYS_ID_DFR0_EL1, ftr_id_dfr0), 281 ARM64_FTR_REG(SYS_ID_MMFR0_EL1, ftr_id_mmfr0), 282 ARM64_FTR_REG(SYS_ID_MMFR1_EL1, ftr_generic_32bits), 283 ARM64_FTR_REG(SYS_ID_MMFR2_EL1, ftr_generic_32bits), 284 ARM64_FTR_REG(SYS_ID_MMFR3_EL1, ftr_generic_32bits), 285 286 /* Op1 = 0, CRn = 0, CRm = 2 */ 287 ARM64_FTR_REG(SYS_ID_ISAR0_EL1, ftr_generic_32bits), 288 ARM64_FTR_REG(SYS_ID_ISAR1_EL1, ftr_generic_32bits), 289 ARM64_FTR_REG(SYS_ID_ISAR2_EL1, ftr_generic_32bits), 290 ARM64_FTR_REG(SYS_ID_ISAR3_EL1, ftr_generic_32bits), 291 ARM64_FTR_REG(SYS_ID_ISAR4_EL1, ftr_generic_32bits), 292 ARM64_FTR_REG(SYS_ID_ISAR5_EL1, ftr_id_isar5), 293 ARM64_FTR_REG(SYS_ID_MMFR4_EL1, ftr_id_mmfr4), 294 295 /* Op1 = 0, CRn = 0, CRm = 3 */ 296 ARM64_FTR_REG(SYS_MVFR0_EL1, ftr_generic_32bits), 297 ARM64_FTR_REG(SYS_MVFR1_EL1, ftr_generic_32bits), 298 ARM64_FTR_REG(SYS_MVFR2_EL1, ftr_mvfr2), 299 300 /* Op1 = 0, CRn = 0, CRm = 4 */ 301 ARM64_FTR_REG(SYS_ID_AA64PFR0_EL1, ftr_id_aa64pfr0), 302 ARM64_FTR_REG(SYS_ID_AA64PFR1_EL1, ftr_aa64raz), 303 304 /* Op1 = 0, CRn = 0, CRm = 5 */ 305 ARM64_FTR_REG(SYS_ID_AA64DFR0_EL1, ftr_id_aa64dfr0), 306 ARM64_FTR_REG(SYS_ID_AA64DFR1_EL1, ftr_generic), 307 308 /* Op1 = 0, CRn = 0, CRm = 6 */ 309 ARM64_FTR_REG(SYS_ID_AA64ISAR0_EL1, ftr_id_aa64isar0), 310 ARM64_FTR_REG(SYS_ID_AA64ISAR1_EL1, ftr_aa64raz), 311 312 /* Op1 = 0, CRn = 0, CRm = 7 */ 313 ARM64_FTR_REG(SYS_ID_AA64MMFR0_EL1, ftr_id_aa64mmfr0), 314 ARM64_FTR_REG(SYS_ID_AA64MMFR1_EL1, ftr_id_aa64mmfr1), 315 ARM64_FTR_REG(SYS_ID_AA64MMFR2_EL1, ftr_id_aa64mmfr2), 316 317 /* Op1 = 3, CRn = 0, CRm = 0 */ 318 ARM64_FTR_REG(SYS_CTR_EL0, ftr_ctr), 319 ARM64_FTR_REG(SYS_DCZID_EL0, ftr_dczid), 320 321 /* Op1 = 3, CRn = 14, CRm = 0 */ 322 ARM64_FTR_REG(SYS_CNTFRQ_EL0, ftr_generic32), 323 }; 324 325 static int search_cmp_ftr_reg(const void *id, const void *regp) 326 { 327 return (int)(unsigned long)id - (int)((const struct arm64_ftr_reg *)regp)->sys_id; 328 } 329 330 /* 331 * get_arm64_ftr_reg - Lookup a feature register entry using its 332 * sys_reg() encoding. With the array arm64_ftr_regs sorted in the 333 * ascending order of sys_id , we use binary search to find a matching 334 * entry. 335 * 336 * returns - Upon success, matching ftr_reg entry for id. 337 * - NULL on failure. It is upto the caller to decide 338 * the impact of a failure. 339 */ 340 static struct arm64_ftr_reg *get_arm64_ftr_reg(u32 sys_id) 341 { 342 return bsearch((const void *)(unsigned long)sys_id, 343 arm64_ftr_regs, 344 ARRAY_SIZE(arm64_ftr_regs), 345 sizeof(arm64_ftr_regs[0]), 346 search_cmp_ftr_reg); 347 } 348 349 static u64 arm64_ftr_set_value(struct arm64_ftr_bits *ftrp, s64 reg, s64 ftr_val) 350 { 351 u64 mask = arm64_ftr_mask(ftrp); 352 353 reg &= ~mask; 354 reg |= (ftr_val << ftrp->shift) & mask; 355 return reg; 356 } 357 358 static s64 arm64_ftr_safe_value(struct arm64_ftr_bits *ftrp, s64 new, s64 cur) 359 { 360 s64 ret = 0; 361 362 switch (ftrp->type) { 363 case FTR_EXACT: 364 ret = ftrp->safe_val; 365 break; 366 case FTR_LOWER_SAFE: 367 ret = new < cur ? new : cur; 368 break; 369 case FTR_HIGHER_SAFE: 370 ret = new > cur ? new : cur; 371 break; 372 default: 373 BUG(); 374 } 375 376 return ret; 377 } 378 379 static int __init sort_cmp_ftr_regs(const void *a, const void *b) 380 { 381 return ((const struct arm64_ftr_reg *)a)->sys_id - 382 ((const struct arm64_ftr_reg *)b)->sys_id; 383 } 384 385 static void __init swap_ftr_regs(void *a, void *b, int size) 386 { 387 struct arm64_ftr_reg tmp = *(struct arm64_ftr_reg *)a; 388 *(struct arm64_ftr_reg *)a = *(struct arm64_ftr_reg *)b; 389 *(struct arm64_ftr_reg *)b = tmp; 390 } 391 392 static void __init sort_ftr_regs(void) 393 { 394 /* Keep the array sorted so that we can do the binary search */ 395 sort(arm64_ftr_regs, 396 ARRAY_SIZE(arm64_ftr_regs), 397 sizeof(arm64_ftr_regs[0]), 398 sort_cmp_ftr_regs, 399 swap_ftr_regs); 400 } 401 402 /* 403 * Initialise the CPU feature register from Boot CPU values. 404 * Also initiliases the strict_mask for the register. 405 */ 406 static void __init init_cpu_ftr_reg(u32 sys_reg, u64 new) 407 { 408 u64 val = 0; 409 u64 strict_mask = ~0x0ULL; 410 struct arm64_ftr_bits *ftrp; 411 struct arm64_ftr_reg *reg = get_arm64_ftr_reg(sys_reg); 412 413 BUG_ON(!reg); 414 415 for (ftrp = reg->ftr_bits; ftrp->width; ftrp++) { 416 s64 ftr_new = arm64_ftr_value(ftrp, new); 417 418 val = arm64_ftr_set_value(ftrp, val, ftr_new); 419 if (!ftrp->strict) 420 strict_mask &= ~arm64_ftr_mask(ftrp); 421 } 422 reg->sys_val = val; 423 reg->strict_mask = strict_mask; 424 } 425 426 void __init init_cpu_features(struct cpuinfo_arm64 *info) 427 { 428 /* Before we start using the tables, make sure it is sorted */ 429 sort_ftr_regs(); 430 431 init_cpu_ftr_reg(SYS_CTR_EL0, info->reg_ctr); 432 init_cpu_ftr_reg(SYS_DCZID_EL0, info->reg_dczid); 433 init_cpu_ftr_reg(SYS_CNTFRQ_EL0, info->reg_cntfrq); 434 init_cpu_ftr_reg(SYS_ID_AA64DFR0_EL1, info->reg_id_aa64dfr0); 435 init_cpu_ftr_reg(SYS_ID_AA64DFR1_EL1, info->reg_id_aa64dfr1); 436 init_cpu_ftr_reg(SYS_ID_AA64ISAR0_EL1, info->reg_id_aa64isar0); 437 init_cpu_ftr_reg(SYS_ID_AA64ISAR1_EL1, info->reg_id_aa64isar1); 438 init_cpu_ftr_reg(SYS_ID_AA64MMFR0_EL1, info->reg_id_aa64mmfr0); 439 init_cpu_ftr_reg(SYS_ID_AA64MMFR1_EL1, info->reg_id_aa64mmfr1); 440 init_cpu_ftr_reg(SYS_ID_AA64MMFR2_EL1, info->reg_id_aa64mmfr2); 441 init_cpu_ftr_reg(SYS_ID_AA64PFR0_EL1, info->reg_id_aa64pfr0); 442 init_cpu_ftr_reg(SYS_ID_AA64PFR1_EL1, info->reg_id_aa64pfr1); 443 444 if (id_aa64pfr0_32bit_el0(info->reg_id_aa64pfr0)) { 445 init_cpu_ftr_reg(SYS_ID_DFR0_EL1, info->reg_id_dfr0); 446 init_cpu_ftr_reg(SYS_ID_ISAR0_EL1, info->reg_id_isar0); 447 init_cpu_ftr_reg(SYS_ID_ISAR1_EL1, info->reg_id_isar1); 448 init_cpu_ftr_reg(SYS_ID_ISAR2_EL1, info->reg_id_isar2); 449 init_cpu_ftr_reg(SYS_ID_ISAR3_EL1, info->reg_id_isar3); 450 init_cpu_ftr_reg(SYS_ID_ISAR4_EL1, info->reg_id_isar4); 451 init_cpu_ftr_reg(SYS_ID_ISAR5_EL1, info->reg_id_isar5); 452 init_cpu_ftr_reg(SYS_ID_MMFR0_EL1, info->reg_id_mmfr0); 453 init_cpu_ftr_reg(SYS_ID_MMFR1_EL1, info->reg_id_mmfr1); 454 init_cpu_ftr_reg(SYS_ID_MMFR2_EL1, info->reg_id_mmfr2); 455 init_cpu_ftr_reg(SYS_ID_MMFR3_EL1, info->reg_id_mmfr3); 456 init_cpu_ftr_reg(SYS_ID_PFR0_EL1, info->reg_id_pfr0); 457 init_cpu_ftr_reg(SYS_ID_PFR1_EL1, info->reg_id_pfr1); 458 init_cpu_ftr_reg(SYS_MVFR0_EL1, info->reg_mvfr0); 459 init_cpu_ftr_reg(SYS_MVFR1_EL1, info->reg_mvfr1); 460 init_cpu_ftr_reg(SYS_MVFR2_EL1, info->reg_mvfr2); 461 } 462 463 } 464 465 static void update_cpu_ftr_reg(struct arm64_ftr_reg *reg, u64 new) 466 { 467 struct arm64_ftr_bits *ftrp; 468 469 for (ftrp = reg->ftr_bits; ftrp->width; ftrp++) { 470 s64 ftr_cur = arm64_ftr_value(ftrp, reg->sys_val); 471 s64 ftr_new = arm64_ftr_value(ftrp, new); 472 473 if (ftr_cur == ftr_new) 474 continue; 475 /* Find a safe value */ 476 ftr_new = arm64_ftr_safe_value(ftrp, ftr_new, ftr_cur); 477 reg->sys_val = arm64_ftr_set_value(ftrp, reg->sys_val, ftr_new); 478 } 479 480 } 481 482 static int check_update_ftr_reg(u32 sys_id, int cpu, u64 val, u64 boot) 483 { 484 struct arm64_ftr_reg *regp = get_arm64_ftr_reg(sys_id); 485 486 BUG_ON(!regp); 487 update_cpu_ftr_reg(regp, val); 488 if ((boot & regp->strict_mask) == (val & regp->strict_mask)) 489 return 0; 490 pr_warn("SANITY CHECK: Unexpected variation in %s. Boot CPU: %#016llx, CPU%d: %#016llx\n", 491 regp->name, boot, cpu, val); 492 return 1; 493 } 494 495 /* 496 * Update system wide CPU feature registers with the values from a 497 * non-boot CPU. Also performs SANITY checks to make sure that there 498 * aren't any insane variations from that of the boot CPU. 499 */ 500 void update_cpu_features(int cpu, 501 struct cpuinfo_arm64 *info, 502 struct cpuinfo_arm64 *boot) 503 { 504 int taint = 0; 505 506 /* 507 * The kernel can handle differing I-cache policies, but otherwise 508 * caches should look identical. Userspace JITs will make use of 509 * *minLine. 510 */ 511 taint |= check_update_ftr_reg(SYS_CTR_EL0, cpu, 512 info->reg_ctr, boot->reg_ctr); 513 514 /* 515 * Userspace may perform DC ZVA instructions. Mismatched block sizes 516 * could result in too much or too little memory being zeroed if a 517 * process is preempted and migrated between CPUs. 518 */ 519 taint |= check_update_ftr_reg(SYS_DCZID_EL0, cpu, 520 info->reg_dczid, boot->reg_dczid); 521 522 /* If different, timekeeping will be broken (especially with KVM) */ 523 taint |= check_update_ftr_reg(SYS_CNTFRQ_EL0, cpu, 524 info->reg_cntfrq, boot->reg_cntfrq); 525 526 /* 527 * The kernel uses self-hosted debug features and expects CPUs to 528 * support identical debug features. We presently need CTX_CMPs, WRPs, 529 * and BRPs to be identical. 530 * ID_AA64DFR1 is currently RES0. 531 */ 532 taint |= check_update_ftr_reg(SYS_ID_AA64DFR0_EL1, cpu, 533 info->reg_id_aa64dfr0, boot->reg_id_aa64dfr0); 534 taint |= check_update_ftr_reg(SYS_ID_AA64DFR1_EL1, cpu, 535 info->reg_id_aa64dfr1, boot->reg_id_aa64dfr1); 536 /* 537 * Even in big.LITTLE, processors should be identical instruction-set 538 * wise. 539 */ 540 taint |= check_update_ftr_reg(SYS_ID_AA64ISAR0_EL1, cpu, 541 info->reg_id_aa64isar0, boot->reg_id_aa64isar0); 542 taint |= check_update_ftr_reg(SYS_ID_AA64ISAR1_EL1, cpu, 543 info->reg_id_aa64isar1, boot->reg_id_aa64isar1); 544 545 /* 546 * Differing PARange support is fine as long as all peripherals and 547 * memory are mapped within the minimum PARange of all CPUs. 548 * Linux should not care about secure memory. 549 */ 550 taint |= check_update_ftr_reg(SYS_ID_AA64MMFR0_EL1, cpu, 551 info->reg_id_aa64mmfr0, boot->reg_id_aa64mmfr0); 552 taint |= check_update_ftr_reg(SYS_ID_AA64MMFR1_EL1, cpu, 553 info->reg_id_aa64mmfr1, boot->reg_id_aa64mmfr1); 554 taint |= check_update_ftr_reg(SYS_ID_AA64MMFR2_EL1, cpu, 555 info->reg_id_aa64mmfr2, boot->reg_id_aa64mmfr2); 556 557 /* 558 * EL3 is not our concern. 559 * ID_AA64PFR1 is currently RES0. 560 */ 561 taint |= check_update_ftr_reg(SYS_ID_AA64PFR0_EL1, cpu, 562 info->reg_id_aa64pfr0, boot->reg_id_aa64pfr0); 563 taint |= check_update_ftr_reg(SYS_ID_AA64PFR1_EL1, cpu, 564 info->reg_id_aa64pfr1, boot->reg_id_aa64pfr1); 565 566 /* 567 * If we have AArch32, we care about 32-bit features for compat. 568 * If the system doesn't support AArch32, don't update them. 569 */ 570 if (id_aa64pfr0_32bit_el0(read_system_reg(SYS_ID_AA64PFR0_EL1)) && 571 id_aa64pfr0_32bit_el0(info->reg_id_aa64pfr0)) { 572 573 taint |= check_update_ftr_reg(SYS_ID_DFR0_EL1, cpu, 574 info->reg_id_dfr0, boot->reg_id_dfr0); 575 taint |= check_update_ftr_reg(SYS_ID_ISAR0_EL1, cpu, 576 info->reg_id_isar0, boot->reg_id_isar0); 577 taint |= check_update_ftr_reg(SYS_ID_ISAR1_EL1, cpu, 578 info->reg_id_isar1, boot->reg_id_isar1); 579 taint |= check_update_ftr_reg(SYS_ID_ISAR2_EL1, cpu, 580 info->reg_id_isar2, boot->reg_id_isar2); 581 taint |= check_update_ftr_reg(SYS_ID_ISAR3_EL1, cpu, 582 info->reg_id_isar3, boot->reg_id_isar3); 583 taint |= check_update_ftr_reg(SYS_ID_ISAR4_EL1, cpu, 584 info->reg_id_isar4, boot->reg_id_isar4); 585 taint |= check_update_ftr_reg(SYS_ID_ISAR5_EL1, cpu, 586 info->reg_id_isar5, boot->reg_id_isar5); 587 588 /* 589 * Regardless of the value of the AuxReg field, the AIFSR, ADFSR, and 590 * ACTLR formats could differ across CPUs and therefore would have to 591 * be trapped for virtualization anyway. 592 */ 593 taint |= check_update_ftr_reg(SYS_ID_MMFR0_EL1, cpu, 594 info->reg_id_mmfr0, boot->reg_id_mmfr0); 595 taint |= check_update_ftr_reg(SYS_ID_MMFR1_EL1, cpu, 596 info->reg_id_mmfr1, boot->reg_id_mmfr1); 597 taint |= check_update_ftr_reg(SYS_ID_MMFR2_EL1, cpu, 598 info->reg_id_mmfr2, boot->reg_id_mmfr2); 599 taint |= check_update_ftr_reg(SYS_ID_MMFR3_EL1, cpu, 600 info->reg_id_mmfr3, boot->reg_id_mmfr3); 601 taint |= check_update_ftr_reg(SYS_ID_PFR0_EL1, cpu, 602 info->reg_id_pfr0, boot->reg_id_pfr0); 603 taint |= check_update_ftr_reg(SYS_ID_PFR1_EL1, cpu, 604 info->reg_id_pfr1, boot->reg_id_pfr1); 605 taint |= check_update_ftr_reg(SYS_MVFR0_EL1, cpu, 606 info->reg_mvfr0, boot->reg_mvfr0); 607 taint |= check_update_ftr_reg(SYS_MVFR1_EL1, cpu, 608 info->reg_mvfr1, boot->reg_mvfr1); 609 taint |= check_update_ftr_reg(SYS_MVFR2_EL1, cpu, 610 info->reg_mvfr2, boot->reg_mvfr2); 611 } 612 613 /* 614 * Mismatched CPU features are a recipe for disaster. Don't even 615 * pretend to support them. 616 */ 617 WARN_TAINT_ONCE(taint, TAINT_CPU_OUT_OF_SPEC, 618 "Unsupported CPU feature variation.\n"); 619 } 620 621 u64 read_system_reg(u32 id) 622 { 623 struct arm64_ftr_reg *regp = get_arm64_ftr_reg(id); 624 625 /* We shouldn't get a request for an unsupported register */ 626 BUG_ON(!regp); 627 return regp->sys_val; 628 } 629 630 /* 631 * __raw_read_system_reg() - Used by a STARTING cpu before cpuinfo is populated. 632 * Read the system register on the current CPU 633 */ 634 static u64 __raw_read_system_reg(u32 sys_id) 635 { 636 switch (sys_id) { 637 case SYS_ID_PFR0_EL1: return read_cpuid(ID_PFR0_EL1); 638 case SYS_ID_PFR1_EL1: return read_cpuid(ID_PFR1_EL1); 639 case SYS_ID_DFR0_EL1: return read_cpuid(ID_DFR0_EL1); 640 case SYS_ID_MMFR0_EL1: return read_cpuid(ID_MMFR0_EL1); 641 case SYS_ID_MMFR1_EL1: return read_cpuid(ID_MMFR1_EL1); 642 case SYS_ID_MMFR2_EL1: return read_cpuid(ID_MMFR2_EL1); 643 case SYS_ID_MMFR3_EL1: return read_cpuid(ID_MMFR3_EL1); 644 case SYS_ID_ISAR0_EL1: return read_cpuid(ID_ISAR0_EL1); 645 case SYS_ID_ISAR1_EL1: return read_cpuid(ID_ISAR1_EL1); 646 case SYS_ID_ISAR2_EL1: return read_cpuid(ID_ISAR2_EL1); 647 case SYS_ID_ISAR3_EL1: return read_cpuid(ID_ISAR3_EL1); 648 case SYS_ID_ISAR4_EL1: return read_cpuid(ID_ISAR4_EL1); 649 case SYS_ID_ISAR5_EL1: return read_cpuid(ID_ISAR4_EL1); 650 case SYS_MVFR0_EL1: return read_cpuid(MVFR0_EL1); 651 case SYS_MVFR1_EL1: return read_cpuid(MVFR1_EL1); 652 case SYS_MVFR2_EL1: return read_cpuid(MVFR2_EL1); 653 654 case SYS_ID_AA64PFR0_EL1: return read_cpuid(ID_AA64PFR0_EL1); 655 case SYS_ID_AA64PFR1_EL1: return read_cpuid(ID_AA64PFR0_EL1); 656 case SYS_ID_AA64DFR0_EL1: return read_cpuid(ID_AA64DFR0_EL1); 657 case SYS_ID_AA64DFR1_EL1: return read_cpuid(ID_AA64DFR0_EL1); 658 case SYS_ID_AA64MMFR0_EL1: return read_cpuid(ID_AA64MMFR0_EL1); 659 case SYS_ID_AA64MMFR1_EL1: return read_cpuid(ID_AA64MMFR1_EL1); 660 case SYS_ID_AA64MMFR2_EL1: return read_cpuid(ID_AA64MMFR2_EL1); 661 case SYS_ID_AA64ISAR0_EL1: return read_cpuid(ID_AA64ISAR0_EL1); 662 case SYS_ID_AA64ISAR1_EL1: return read_cpuid(ID_AA64ISAR1_EL1); 663 664 case SYS_CNTFRQ_EL0: return read_cpuid(CNTFRQ_EL0); 665 case SYS_CTR_EL0: return read_cpuid(CTR_EL0); 666 case SYS_DCZID_EL0: return read_cpuid(DCZID_EL0); 667 default: 668 BUG(); 669 return 0; 670 } 671 } 672 673 #include <linux/irqchip/arm-gic-v3.h> 674 675 static bool 676 feature_matches(u64 reg, const struct arm64_cpu_capabilities *entry) 677 { 678 int val = cpuid_feature_extract_field(reg, entry->field_pos, entry->sign); 679 680 return val >= entry->min_field_value; 681 } 682 683 static bool 684 has_cpuid_feature(const struct arm64_cpu_capabilities *entry, int scope) 685 { 686 u64 val; 687 688 WARN_ON(scope == SCOPE_LOCAL_CPU && preemptible()); 689 if (scope == SCOPE_SYSTEM) 690 val = read_system_reg(entry->sys_reg); 691 else 692 val = __raw_read_system_reg(entry->sys_reg); 693 694 return feature_matches(val, entry); 695 } 696 697 static bool has_useable_gicv3_cpuif(const struct arm64_cpu_capabilities *entry, int scope) 698 { 699 bool has_sre; 700 701 if (!has_cpuid_feature(entry, scope)) 702 return false; 703 704 has_sre = gic_enable_sre(); 705 if (!has_sre) 706 pr_warn_once("%s present but disabled by higher exception level\n", 707 entry->desc); 708 709 return has_sre; 710 } 711 712 static bool has_no_hw_prefetch(const struct arm64_cpu_capabilities *entry, int __unused) 713 { 714 u32 midr = read_cpuid_id(); 715 u32 rv_min, rv_max; 716 717 /* Cavium ThunderX pass 1.x and 2.x */ 718 rv_min = 0; 719 rv_max = (1 << MIDR_VARIANT_SHIFT) | MIDR_REVISION_MASK; 720 721 return MIDR_IS_CPU_MODEL_RANGE(midr, MIDR_THUNDERX, rv_min, rv_max); 722 } 723 724 static bool runs_at_el2(const struct arm64_cpu_capabilities *entry, int __unused) 725 { 726 return is_kernel_in_hyp_mode(); 727 } 728 729 static bool hyp_offset_low(const struct arm64_cpu_capabilities *entry, 730 int __unused) 731 { 732 phys_addr_t idmap_addr = virt_to_phys(__hyp_idmap_text_start); 733 734 /* 735 * Activate the lower HYP offset only if: 736 * - the idmap doesn't clash with it, 737 * - the kernel is not running at EL2. 738 */ 739 return idmap_addr > GENMASK(VA_BITS - 2, 0) && !is_kernel_in_hyp_mode(); 740 } 741 742 static const struct arm64_cpu_capabilities arm64_features[] = { 743 { 744 .desc = "GIC system register CPU interface", 745 .capability = ARM64_HAS_SYSREG_GIC_CPUIF, 746 .def_scope = SCOPE_SYSTEM, 747 .matches = has_useable_gicv3_cpuif, 748 .sys_reg = SYS_ID_AA64PFR0_EL1, 749 .field_pos = ID_AA64PFR0_GIC_SHIFT, 750 .sign = FTR_UNSIGNED, 751 .min_field_value = 1, 752 }, 753 #ifdef CONFIG_ARM64_PAN 754 { 755 .desc = "Privileged Access Never", 756 .capability = ARM64_HAS_PAN, 757 .def_scope = SCOPE_SYSTEM, 758 .matches = has_cpuid_feature, 759 .sys_reg = SYS_ID_AA64MMFR1_EL1, 760 .field_pos = ID_AA64MMFR1_PAN_SHIFT, 761 .sign = FTR_UNSIGNED, 762 .min_field_value = 1, 763 .enable = cpu_enable_pan, 764 }, 765 #endif /* CONFIG_ARM64_PAN */ 766 #if defined(CONFIG_AS_LSE) && defined(CONFIG_ARM64_LSE_ATOMICS) 767 { 768 .desc = "LSE atomic instructions", 769 .capability = ARM64_HAS_LSE_ATOMICS, 770 .def_scope = SCOPE_SYSTEM, 771 .matches = has_cpuid_feature, 772 .sys_reg = SYS_ID_AA64ISAR0_EL1, 773 .field_pos = ID_AA64ISAR0_ATOMICS_SHIFT, 774 .sign = FTR_UNSIGNED, 775 .min_field_value = 2, 776 }, 777 #endif /* CONFIG_AS_LSE && CONFIG_ARM64_LSE_ATOMICS */ 778 { 779 .desc = "Software prefetching using PRFM", 780 .capability = ARM64_HAS_NO_HW_PREFETCH, 781 .def_scope = SCOPE_SYSTEM, 782 .matches = has_no_hw_prefetch, 783 }, 784 #ifdef CONFIG_ARM64_UAO 785 { 786 .desc = "User Access Override", 787 .capability = ARM64_HAS_UAO, 788 .def_scope = SCOPE_SYSTEM, 789 .matches = has_cpuid_feature, 790 .sys_reg = SYS_ID_AA64MMFR2_EL1, 791 .field_pos = ID_AA64MMFR2_UAO_SHIFT, 792 .min_field_value = 1, 793 .enable = cpu_enable_uao, 794 }, 795 #endif /* CONFIG_ARM64_UAO */ 796 #ifdef CONFIG_ARM64_PAN 797 { 798 .capability = ARM64_ALT_PAN_NOT_UAO, 799 .def_scope = SCOPE_SYSTEM, 800 .matches = cpufeature_pan_not_uao, 801 }, 802 #endif /* CONFIG_ARM64_PAN */ 803 { 804 .desc = "Virtualization Host Extensions", 805 .capability = ARM64_HAS_VIRT_HOST_EXTN, 806 .def_scope = SCOPE_SYSTEM, 807 .matches = runs_at_el2, 808 }, 809 { 810 .desc = "32-bit EL0 Support", 811 .capability = ARM64_HAS_32BIT_EL0, 812 .def_scope = SCOPE_SYSTEM, 813 .matches = has_cpuid_feature, 814 .sys_reg = SYS_ID_AA64PFR0_EL1, 815 .sign = FTR_UNSIGNED, 816 .field_pos = ID_AA64PFR0_EL0_SHIFT, 817 .min_field_value = ID_AA64PFR0_EL0_32BIT_64BIT, 818 }, 819 { 820 .desc = "Reduced HYP mapping offset", 821 .capability = ARM64_HYP_OFFSET_LOW, 822 .def_scope = SCOPE_SYSTEM, 823 .matches = hyp_offset_low, 824 }, 825 {}, 826 }; 827 828 #define HWCAP_CAP(reg, field, s, min_value, type, cap) \ 829 { \ 830 .desc = #cap, \ 831 .def_scope = SCOPE_SYSTEM, \ 832 .matches = has_cpuid_feature, \ 833 .sys_reg = reg, \ 834 .field_pos = field, \ 835 .sign = s, \ 836 .min_field_value = min_value, \ 837 .hwcap_type = type, \ 838 .hwcap = cap, \ 839 } 840 841 static const struct arm64_cpu_capabilities arm64_elf_hwcaps[] = { 842 HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_AES_SHIFT, FTR_UNSIGNED, 2, CAP_HWCAP, HWCAP_PMULL), 843 HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_AES_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, HWCAP_AES), 844 HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_SHA1_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, HWCAP_SHA1), 845 HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_SHA2_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, HWCAP_SHA2), 846 HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_CRC32_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, HWCAP_CRC32), 847 HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_ATOMICS_SHIFT, FTR_UNSIGNED, 2, CAP_HWCAP, HWCAP_ATOMICS), 848 HWCAP_CAP(SYS_ID_AA64PFR0_EL1, ID_AA64PFR0_FP_SHIFT, FTR_SIGNED, 0, CAP_HWCAP, HWCAP_FP), 849 HWCAP_CAP(SYS_ID_AA64PFR0_EL1, ID_AA64PFR0_FP_SHIFT, FTR_SIGNED, 1, CAP_HWCAP, HWCAP_FPHP), 850 HWCAP_CAP(SYS_ID_AA64PFR0_EL1, ID_AA64PFR0_ASIMD_SHIFT, FTR_SIGNED, 0, CAP_HWCAP, HWCAP_ASIMD), 851 HWCAP_CAP(SYS_ID_AA64PFR0_EL1, ID_AA64PFR0_ASIMD_SHIFT, FTR_SIGNED, 1, CAP_HWCAP, HWCAP_ASIMDHP), 852 {}, 853 }; 854 855 static const struct arm64_cpu_capabilities compat_elf_hwcaps[] = { 856 #ifdef CONFIG_COMPAT 857 HWCAP_CAP(SYS_ID_ISAR5_EL1, ID_ISAR5_AES_SHIFT, FTR_UNSIGNED, 2, CAP_COMPAT_HWCAP2, COMPAT_HWCAP2_PMULL), 858 HWCAP_CAP(SYS_ID_ISAR5_EL1, ID_ISAR5_AES_SHIFT, FTR_UNSIGNED, 1, CAP_COMPAT_HWCAP2, COMPAT_HWCAP2_AES), 859 HWCAP_CAP(SYS_ID_ISAR5_EL1, ID_ISAR5_SHA1_SHIFT, FTR_UNSIGNED, 1, CAP_COMPAT_HWCAP2, COMPAT_HWCAP2_SHA1), 860 HWCAP_CAP(SYS_ID_ISAR5_EL1, ID_ISAR5_SHA2_SHIFT, FTR_UNSIGNED, 1, CAP_COMPAT_HWCAP2, COMPAT_HWCAP2_SHA2), 861 HWCAP_CAP(SYS_ID_ISAR5_EL1, ID_ISAR5_CRC32_SHIFT, FTR_UNSIGNED, 1, CAP_COMPAT_HWCAP2, COMPAT_HWCAP2_CRC32), 862 #endif 863 {}, 864 }; 865 866 static void __init cap_set_elf_hwcap(const struct arm64_cpu_capabilities *cap) 867 { 868 switch (cap->hwcap_type) { 869 case CAP_HWCAP: 870 elf_hwcap |= cap->hwcap; 871 break; 872 #ifdef CONFIG_COMPAT 873 case CAP_COMPAT_HWCAP: 874 compat_elf_hwcap |= (u32)cap->hwcap; 875 break; 876 case CAP_COMPAT_HWCAP2: 877 compat_elf_hwcap2 |= (u32)cap->hwcap; 878 break; 879 #endif 880 default: 881 WARN_ON(1); 882 break; 883 } 884 } 885 886 /* Check if we have a particular HWCAP enabled */ 887 static bool cpus_have_elf_hwcap(const struct arm64_cpu_capabilities *cap) 888 { 889 bool rc; 890 891 switch (cap->hwcap_type) { 892 case CAP_HWCAP: 893 rc = (elf_hwcap & cap->hwcap) != 0; 894 break; 895 #ifdef CONFIG_COMPAT 896 case CAP_COMPAT_HWCAP: 897 rc = (compat_elf_hwcap & (u32)cap->hwcap) != 0; 898 break; 899 case CAP_COMPAT_HWCAP2: 900 rc = (compat_elf_hwcap2 & (u32)cap->hwcap) != 0; 901 break; 902 #endif 903 default: 904 WARN_ON(1); 905 rc = false; 906 } 907 908 return rc; 909 } 910 911 static void __init setup_elf_hwcaps(const struct arm64_cpu_capabilities *hwcaps) 912 { 913 for (; hwcaps->matches; hwcaps++) 914 if (hwcaps->matches(hwcaps, hwcaps->def_scope)) 915 cap_set_elf_hwcap(hwcaps); 916 } 917 918 void update_cpu_capabilities(const struct arm64_cpu_capabilities *caps, 919 const char *info) 920 { 921 for (; caps->matches; caps++) { 922 if (!caps->matches(caps, caps->def_scope)) 923 continue; 924 925 if (!cpus_have_cap(caps->capability) && caps->desc) 926 pr_info("%s %s\n", info, caps->desc); 927 cpus_set_cap(caps->capability); 928 } 929 } 930 931 /* 932 * Run through the enabled capabilities and enable() it on all active 933 * CPUs 934 */ 935 void __init enable_cpu_capabilities(const struct arm64_cpu_capabilities *caps) 936 { 937 for (; caps->matches; caps++) 938 if (caps->enable && cpus_have_cap(caps->capability)) 939 on_each_cpu(caps->enable, NULL, true); 940 } 941 942 /* 943 * Flag to indicate if we have computed the system wide 944 * capabilities based on the boot time active CPUs. This 945 * will be used to determine if a new booting CPU should 946 * go through the verification process to make sure that it 947 * supports the system capabilities, without using a hotplug 948 * notifier. 949 */ 950 static bool sys_caps_initialised; 951 952 static inline void set_sys_caps_initialised(void) 953 { 954 sys_caps_initialised = true; 955 } 956 957 /* 958 * Check for CPU features that are used in early boot 959 * based on the Boot CPU value. 960 */ 961 static void check_early_cpu_features(void) 962 { 963 verify_cpu_run_el(); 964 verify_cpu_asid_bits(); 965 } 966 967 static void 968 verify_local_elf_hwcaps(const struct arm64_cpu_capabilities *caps) 969 { 970 971 for (; caps->matches; caps++) 972 if (cpus_have_elf_hwcap(caps) && !caps->matches(caps, SCOPE_LOCAL_CPU)) { 973 pr_crit("CPU%d: missing HWCAP: %s\n", 974 smp_processor_id(), caps->desc); 975 cpu_die_early(); 976 } 977 } 978 979 static void 980 verify_local_cpu_features(const struct arm64_cpu_capabilities *caps) 981 { 982 for (; caps->matches; caps++) { 983 if (!cpus_have_cap(caps->capability)) 984 continue; 985 /* 986 * If the new CPU misses an advertised feature, we cannot proceed 987 * further, park the cpu. 988 */ 989 if (!caps->matches(caps, SCOPE_LOCAL_CPU)) { 990 pr_crit("CPU%d: missing feature: %s\n", 991 smp_processor_id(), caps->desc); 992 cpu_die_early(); 993 } 994 if (caps->enable) 995 caps->enable(NULL); 996 } 997 } 998 999 /* 1000 * Run through the enabled system capabilities and enable() it on this CPU. 1001 * The capabilities were decided based on the available CPUs at the boot time. 1002 * Any new CPU should match the system wide status of the capability. If the 1003 * new CPU doesn't have a capability which the system now has enabled, we 1004 * cannot do anything to fix it up and could cause unexpected failures. So 1005 * we park the CPU. 1006 */ 1007 void verify_local_cpu_capabilities(void) 1008 { 1009 1010 check_early_cpu_features(); 1011 1012 /* 1013 * If we haven't computed the system capabilities, there is nothing 1014 * to verify. 1015 */ 1016 if (!sys_caps_initialised) 1017 return; 1018 1019 verify_local_cpu_errata(); 1020 verify_local_cpu_features(arm64_features); 1021 verify_local_elf_hwcaps(arm64_elf_hwcaps); 1022 if (system_supports_32bit_el0()) 1023 verify_local_elf_hwcaps(compat_elf_hwcaps); 1024 } 1025 1026 static void __init setup_feature_capabilities(void) 1027 { 1028 update_cpu_capabilities(arm64_features, "detected feature:"); 1029 enable_cpu_capabilities(arm64_features); 1030 } 1031 1032 /* 1033 * Check if the current CPU has a given feature capability. 1034 * Should be called from non-preemptible context. 1035 */ 1036 bool this_cpu_has_cap(unsigned int cap) 1037 { 1038 const struct arm64_cpu_capabilities *caps; 1039 1040 if (WARN_ON(preemptible())) 1041 return false; 1042 1043 for (caps = arm64_features; caps->desc; caps++) 1044 if (caps->capability == cap && caps->matches) 1045 return caps->matches(caps, SCOPE_LOCAL_CPU); 1046 1047 return false; 1048 } 1049 1050 void __init setup_cpu_features(void) 1051 { 1052 u32 cwg; 1053 int cls; 1054 1055 /* Set the CPU feature capabilies */ 1056 setup_feature_capabilities(); 1057 enable_errata_workarounds(); 1058 setup_elf_hwcaps(arm64_elf_hwcaps); 1059 1060 if (system_supports_32bit_el0()) 1061 setup_elf_hwcaps(compat_elf_hwcaps); 1062 1063 /* Advertise that we have computed the system capabilities */ 1064 set_sys_caps_initialised(); 1065 1066 /* 1067 * Check for sane CTR_EL0.CWG value. 1068 */ 1069 cwg = cache_type_cwg(); 1070 cls = cache_line_size(); 1071 if (!cwg) 1072 pr_warn("No Cache Writeback Granule information, assuming cache line size %d\n", 1073 cls); 1074 if (L1_CACHE_BYTES < cls) 1075 pr_warn("L1_CACHE_BYTES smaller than the Cache Writeback Granule (%d < %d)\n", 1076 L1_CACHE_BYTES, cls); 1077 } 1078 1079 static bool __maybe_unused 1080 cpufeature_pan_not_uao(const struct arm64_cpu_capabilities *entry, int __unused) 1081 { 1082 return (cpus_have_cap(ARM64_HAS_PAN) && !cpus_have_cap(ARM64_HAS_UAO)); 1083 } 1084