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359b7064 MZ |
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 | ||
9cdf8ec4 | 19 | #define pr_fmt(fmt) "CPU features: " fmt |
359b7064 | 20 | |
3c739b57 SP |
21 | #include <linux/bsearch.h> |
22 | #include <linux/sort.h> | |
359b7064 MZ |
23 | #include <linux/types.h> |
24 | #include <asm/cpu.h> | |
25 | #include <asm/cpufeature.h> | |
dbb4e152 | 26 | #include <asm/cpu_ops.h> |
338d4f49 | 27 | #include <asm/processor.h> |
cdcf817b | 28 | #include <asm/sysreg.h> |
359b7064 | 29 | |
9cdf8ec4 SP |
30 | unsigned long elf_hwcap __read_mostly; |
31 | EXPORT_SYMBOL_GPL(elf_hwcap); | |
32 | ||
33 | #ifdef CONFIG_COMPAT | |
34 | #define COMPAT_ELF_HWCAP_DEFAULT \ | |
35 | (COMPAT_HWCAP_HALF|COMPAT_HWCAP_THUMB|\ | |
36 | COMPAT_HWCAP_FAST_MULT|COMPAT_HWCAP_EDSP|\ | |
37 | COMPAT_HWCAP_TLS|COMPAT_HWCAP_VFP|\ | |
38 | COMPAT_HWCAP_VFPv3|COMPAT_HWCAP_VFPv4|\ | |
39 | COMPAT_HWCAP_NEON|COMPAT_HWCAP_IDIV|\ | |
40 | COMPAT_HWCAP_LPAE) | |
41 | unsigned int compat_elf_hwcap __read_mostly = COMPAT_ELF_HWCAP_DEFAULT; | |
42 | unsigned int compat_elf_hwcap2 __read_mostly; | |
43 | #endif | |
44 | ||
45 | DECLARE_BITMAP(cpu_hwcaps, ARM64_NCAPS); | |
46 | ||
4f0a606b | 47 | #define __ARM64_FTR_BITS(SIGNED, STRICT, TYPE, SHIFT, WIDTH, SAFE_VAL) \ |
3c739b57 | 48 | { \ |
4f0a606b | 49 | .sign = SIGNED, \ |
3c739b57 SP |
50 | .strict = STRICT, \ |
51 | .type = TYPE, \ | |
52 | .shift = SHIFT, \ | |
53 | .width = WIDTH, \ | |
54 | .safe_val = SAFE_VAL, \ | |
55 | } | |
56 | ||
4f0a606b SP |
57 | /* Define a feature with signed values */ |
58 | #define ARM64_FTR_BITS(STRICT, TYPE, SHIFT, WIDTH, SAFE_VAL) \ | |
59 | __ARM64_FTR_BITS(FTR_SIGNED, STRICT, TYPE, SHIFT, WIDTH, SAFE_VAL) | |
60 | ||
61 | /* Define a feature with unsigned value */ | |
62 | #define U_ARM64_FTR_BITS(STRICT, TYPE, SHIFT, WIDTH, SAFE_VAL) \ | |
63 | __ARM64_FTR_BITS(FTR_UNSIGNED, STRICT, TYPE, SHIFT, WIDTH, SAFE_VAL) | |
64 | ||
3c739b57 SP |
65 | #define ARM64_FTR_END \ |
66 | { \ | |
67 | .width = 0, \ | |
68 | } | |
69 | ||
70 | static struct arm64_ftr_bits ftr_id_aa64isar0[] = { | |
71 | ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 32, 32, 0), | |
72 | ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, ID_AA64ISAR0_RDM_SHIFT, 4, 0), | |
73 | ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 24, 4, 0), | |
74 | ARM64_FTR_BITS(FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_ATOMICS_SHIFT, 4, 0), | |
75 | ARM64_FTR_BITS(FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_CRC32_SHIFT, 4, 0), | |
76 | ARM64_FTR_BITS(FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_SHA2_SHIFT, 4, 0), | |
77 | ARM64_FTR_BITS(FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_SHA1_SHIFT, 4, 0), | |
78 | ARM64_FTR_BITS(FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_AES_SHIFT, 4, 0), | |
79 | ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 0, 4, 0), /* RAZ */ | |
80 | ARM64_FTR_END, | |
81 | }; | |
82 | ||
83 | static struct arm64_ftr_bits ftr_id_aa64pfr0[] = { | |
84 | ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 32, 32, 0), | |
85 | ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 28, 4, 0), | |
86 | ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, ID_AA64PFR0_GIC_SHIFT, 4, 0), | |
87 | ARM64_FTR_BITS(FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR0_ASIMD_SHIFT, 4, ID_AA64PFR0_ASIMD_NI), | |
88 | ARM64_FTR_BITS(FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR0_FP_SHIFT, 4, ID_AA64PFR0_FP_NI), | |
89 | /* Linux doesn't care about the EL3 */ | |
90 | ARM64_FTR_BITS(FTR_NONSTRICT, FTR_EXACT, ID_AA64PFR0_EL3_SHIFT, 4, 0), | |
91 | ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, ID_AA64PFR0_EL2_SHIFT, 4, 0), | |
92 | ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, ID_AA64PFR0_EL1_SHIFT, 4, ID_AA64PFR0_EL1_64BIT_ONLY), | |
93 | ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, ID_AA64PFR0_EL0_SHIFT, 4, ID_AA64PFR0_EL0_64BIT_ONLY), | |
94 | ARM64_FTR_END, | |
95 | }; | |
96 | ||
97 | static struct arm64_ftr_bits ftr_id_aa64mmfr0[] = { | |
98 | ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 32, 32, 0), | |
99 | ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, ID_AA64MMFR0_TGRAN4_SHIFT, 4, ID_AA64MMFR0_TGRAN4_NI), | |
100 | ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, ID_AA64MMFR0_TGRAN64_SHIFT, 4, ID_AA64MMFR0_TGRAN64_NI), | |
101 | ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, ID_AA64MMFR0_TGRAN16_SHIFT, 4, ID_AA64MMFR0_TGRAN16_NI), | |
102 | ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, ID_AA64MMFR0_BIGENDEL0_SHIFT, 4, 0), | |
103 | /* Linux shouldn't care about secure memory */ | |
104 | ARM64_FTR_BITS(FTR_NONSTRICT, FTR_EXACT, ID_AA64MMFR0_SNSMEM_SHIFT, 4, 0), | |
105 | ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, ID_AA64MMFR0_BIGENDEL_SHIFT, 4, 0), | |
106 | ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, ID_AA64MMFR0_ASID_SHIFT, 4, 0), | |
107 | /* | |
108 | * Differing PARange is fine as long as all peripherals and memory are mapped | |
109 | * within the minimum PARange of all CPUs | |
110 | */ | |
4f0a606b | 111 | U_ARM64_FTR_BITS(FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_PARANGE_SHIFT, 4, 0), |
3c739b57 SP |
112 | ARM64_FTR_END, |
113 | }; | |
114 | ||
115 | static struct arm64_ftr_bits ftr_id_aa64mmfr1[] = { | |
116 | ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 32, 32, 0), | |
117 | ARM64_FTR_BITS(FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_PAN_SHIFT, 4, 0), | |
118 | ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, ID_AA64MMFR1_LOR_SHIFT, 4, 0), | |
119 | ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, ID_AA64MMFR1_HPD_SHIFT, 4, 0), | |
120 | ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, ID_AA64MMFR1_VHE_SHIFT, 4, 0), | |
121 | ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, ID_AA64MMFR1_VMIDBITS_SHIFT, 4, 0), | |
122 | ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, ID_AA64MMFR1_HADBS_SHIFT, 4, 0), | |
123 | ARM64_FTR_END, | |
124 | }; | |
125 | ||
126 | static struct arm64_ftr_bits ftr_ctr[] = { | |
4f0a606b | 127 | U_ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 31, 1, 1), /* RAO */ |
3c739b57 | 128 | ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 28, 3, 0), |
4f0a606b SP |
129 | U_ARM64_FTR_BITS(FTR_STRICT, FTR_HIGHER_SAFE, 24, 4, 0), /* CWG */ |
130 | U_ARM64_FTR_BITS(FTR_STRICT, FTR_LOWER_SAFE, 20, 4, 0), /* ERG */ | |
131 | U_ARM64_FTR_BITS(FTR_STRICT, FTR_LOWER_SAFE, 16, 4, 1), /* DminLine */ | |
3c739b57 SP |
132 | /* |
133 | * Linux can handle differing I-cache policies. Userspace JITs will | |
134 | * make use of *minLine | |
135 | */ | |
4f0a606b | 136 | U_ARM64_FTR_BITS(FTR_NONSTRICT, FTR_EXACT, 14, 2, 0), /* L1Ip */ |
3c739b57 | 137 | ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 4, 10, 0), /* RAZ */ |
4f0a606b | 138 | U_ARM64_FTR_BITS(FTR_STRICT, FTR_LOWER_SAFE, 0, 4, 0), /* IminLine */ |
3c739b57 SP |
139 | ARM64_FTR_END, |
140 | }; | |
141 | ||
142 | static struct arm64_ftr_bits ftr_id_mmfr0[] = { | |
143 | ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 28, 4, 0), /* InnerShr */ | |
144 | ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 24, 4, 0), /* FCSE */ | |
145 | ARM64_FTR_BITS(FTR_NONSTRICT, FTR_LOWER_SAFE, 20, 4, 0), /* AuxReg */ | |
146 | ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 16, 4, 0), /* TCM */ | |
147 | ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 12, 4, 0), /* ShareLvl */ | |
148 | ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 8, 4, 0), /* OuterShr */ | |
149 | ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 4, 4, 0), /* PMSA */ | |
150 | ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 0, 4, 0), /* VMSA */ | |
151 | ARM64_FTR_END, | |
152 | }; | |
153 | ||
154 | static struct arm64_ftr_bits ftr_id_aa64dfr0[] = { | |
155 | ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 32, 32, 0), | |
4f0a606b SP |
156 | U_ARM64_FTR_BITS(FTR_STRICT, FTR_LOWER_SAFE, ID_AA64DFR0_CTX_CMPS_SHIFT, 4, 0), |
157 | U_ARM64_FTR_BITS(FTR_STRICT, FTR_LOWER_SAFE, ID_AA64DFR0_WRPS_SHIFT, 4, 0), | |
158 | U_ARM64_FTR_BITS(FTR_STRICT, FTR_LOWER_SAFE, ID_AA64DFR0_BRPS_SHIFT, 4, 0), | |
159 | U_ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, ID_AA64DFR0_PMUVER_SHIFT, 4, 0), | |
160 | U_ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, ID_AA64DFR0_TRACEVER_SHIFT, 4, 0), | |
161 | U_ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, ID_AA64DFR0_DEBUGVER_SHIFT, 4, 0x6), | |
3c739b57 SP |
162 | ARM64_FTR_END, |
163 | }; | |
164 | ||
165 | static struct arm64_ftr_bits ftr_mvfr2[] = { | |
166 | ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 8, 24, 0), /* RAZ */ | |
167 | ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 4, 4, 0), /* FPMisc */ | |
168 | ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 0, 4, 0), /* SIMDMisc */ | |
169 | ARM64_FTR_END, | |
170 | }; | |
171 | ||
172 | static struct arm64_ftr_bits ftr_dczid[] = { | |
173 | ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 5, 27, 0), /* RAZ */ | |
174 | ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 4, 1, 1), /* DZP */ | |
175 | ARM64_FTR_BITS(FTR_STRICT, FTR_LOWER_SAFE, 0, 4, 0), /* BS */ | |
176 | ARM64_FTR_END, | |
177 | }; | |
178 | ||
179 | ||
180 | static struct arm64_ftr_bits ftr_id_isar5[] = { | |
181 | ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, ID_ISAR5_RDM_SHIFT, 4, 0), | |
182 | ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 20, 4, 0), /* RAZ */ | |
183 | ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, ID_ISAR5_CRC32_SHIFT, 4, 0), | |
184 | ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, ID_ISAR5_SHA2_SHIFT, 4, 0), | |
185 | ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, ID_ISAR5_SHA1_SHIFT, 4, 0), | |
186 | ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, ID_ISAR5_AES_SHIFT, 4, 0), | |
187 | ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, ID_ISAR5_SEVL_SHIFT, 4, 0), | |
188 | ARM64_FTR_END, | |
189 | }; | |
190 | ||
191 | static struct arm64_ftr_bits ftr_id_mmfr4[] = { | |
192 | ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 8, 24, 0), /* RAZ */ | |
193 | ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 4, 4, 0), /* ac2 */ | |
194 | ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 0, 4, 0), /* RAZ */ | |
195 | ARM64_FTR_END, | |
196 | }; | |
197 | ||
198 | static struct arm64_ftr_bits ftr_id_pfr0[] = { | |
199 | ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 16, 16, 0), /* RAZ */ | |
200 | ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 12, 4, 0), /* State3 */ | |
201 | ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 8, 4, 0), /* State2 */ | |
202 | ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 4, 4, 0), /* State1 */ | |
203 | ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 0, 4, 0), /* State0 */ | |
204 | ARM64_FTR_END, | |
205 | }; | |
206 | ||
207 | /* | |
208 | * Common ftr bits for a 32bit register with all hidden, strict | |
209 | * attributes, with 4bit feature fields and a default safe value of | |
210 | * 0. Covers the following 32bit registers: | |
211 | * id_isar[0-4], id_mmfr[1-3], id_pfr1, mvfr[0-1] | |
212 | */ | |
213 | static struct arm64_ftr_bits ftr_generic_32bits[] = { | |
214 | ARM64_FTR_BITS(FTR_STRICT, FTR_LOWER_SAFE, 28, 4, 0), | |
215 | ARM64_FTR_BITS(FTR_STRICT, FTR_LOWER_SAFE, 24, 4, 0), | |
216 | ARM64_FTR_BITS(FTR_STRICT, FTR_LOWER_SAFE, 20, 4, 0), | |
217 | ARM64_FTR_BITS(FTR_STRICT, FTR_LOWER_SAFE, 16, 4, 0), | |
218 | ARM64_FTR_BITS(FTR_STRICT, FTR_LOWER_SAFE, 12, 4, 0), | |
219 | ARM64_FTR_BITS(FTR_STRICT, FTR_LOWER_SAFE, 8, 4, 0), | |
220 | ARM64_FTR_BITS(FTR_STRICT, FTR_LOWER_SAFE, 4, 4, 0), | |
221 | ARM64_FTR_BITS(FTR_STRICT, FTR_LOWER_SAFE, 0, 4, 0), | |
222 | ARM64_FTR_END, | |
223 | }; | |
224 | ||
225 | static struct arm64_ftr_bits ftr_generic[] = { | |
226 | ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 0, 64, 0), | |
227 | ARM64_FTR_END, | |
228 | }; | |
229 | ||
230 | static struct arm64_ftr_bits ftr_generic32[] = { | |
231 | ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 0, 32, 0), | |
232 | ARM64_FTR_END, | |
233 | }; | |
234 | ||
235 | static struct arm64_ftr_bits ftr_aa64raz[] = { | |
236 | ARM64_FTR_BITS(FTR_STRICT, FTR_EXACT, 0, 64, 0), | |
237 | ARM64_FTR_END, | |
238 | }; | |
239 | ||
240 | #define ARM64_FTR_REG(id, table) \ | |
241 | { \ | |
242 | .sys_id = id, \ | |
243 | .name = #id, \ | |
244 | .ftr_bits = &((table)[0]), \ | |
245 | } | |
246 | ||
247 | static struct arm64_ftr_reg arm64_ftr_regs[] = { | |
248 | ||
249 | /* Op1 = 0, CRn = 0, CRm = 1 */ | |
250 | ARM64_FTR_REG(SYS_ID_PFR0_EL1, ftr_id_pfr0), | |
251 | ARM64_FTR_REG(SYS_ID_PFR1_EL1, ftr_generic_32bits), | |
252 | ARM64_FTR_REG(SYS_ID_DFR0_EL1, ftr_generic_32bits), | |
253 | ARM64_FTR_REG(SYS_ID_MMFR0_EL1, ftr_id_mmfr0), | |
254 | ARM64_FTR_REG(SYS_ID_MMFR1_EL1, ftr_generic_32bits), | |
255 | ARM64_FTR_REG(SYS_ID_MMFR2_EL1, ftr_generic_32bits), | |
256 | ARM64_FTR_REG(SYS_ID_MMFR3_EL1, ftr_generic_32bits), | |
257 | ||
258 | /* Op1 = 0, CRn = 0, CRm = 2 */ | |
259 | ARM64_FTR_REG(SYS_ID_ISAR0_EL1, ftr_generic_32bits), | |
260 | ARM64_FTR_REG(SYS_ID_ISAR1_EL1, ftr_generic_32bits), | |
261 | ARM64_FTR_REG(SYS_ID_ISAR2_EL1, ftr_generic_32bits), | |
262 | ARM64_FTR_REG(SYS_ID_ISAR3_EL1, ftr_generic_32bits), | |
263 | ARM64_FTR_REG(SYS_ID_ISAR4_EL1, ftr_generic_32bits), | |
264 | ARM64_FTR_REG(SYS_ID_ISAR5_EL1, ftr_id_isar5), | |
265 | ARM64_FTR_REG(SYS_ID_MMFR4_EL1, ftr_id_mmfr4), | |
266 | ||
267 | /* Op1 = 0, CRn = 0, CRm = 3 */ | |
268 | ARM64_FTR_REG(SYS_MVFR0_EL1, ftr_generic_32bits), | |
269 | ARM64_FTR_REG(SYS_MVFR1_EL1, ftr_generic_32bits), | |
270 | ARM64_FTR_REG(SYS_MVFR2_EL1, ftr_mvfr2), | |
271 | ||
272 | /* Op1 = 0, CRn = 0, CRm = 4 */ | |
273 | ARM64_FTR_REG(SYS_ID_AA64PFR0_EL1, ftr_id_aa64pfr0), | |
274 | ARM64_FTR_REG(SYS_ID_AA64PFR1_EL1, ftr_aa64raz), | |
275 | ||
276 | /* Op1 = 0, CRn = 0, CRm = 5 */ | |
277 | ARM64_FTR_REG(SYS_ID_AA64DFR0_EL1, ftr_id_aa64dfr0), | |
278 | ARM64_FTR_REG(SYS_ID_AA64DFR1_EL1, ftr_generic), | |
279 | ||
280 | /* Op1 = 0, CRn = 0, CRm = 6 */ | |
281 | ARM64_FTR_REG(SYS_ID_AA64ISAR0_EL1, ftr_id_aa64isar0), | |
282 | ARM64_FTR_REG(SYS_ID_AA64ISAR1_EL1, ftr_aa64raz), | |
283 | ||
284 | /* Op1 = 0, CRn = 0, CRm = 7 */ | |
285 | ARM64_FTR_REG(SYS_ID_AA64MMFR0_EL1, ftr_id_aa64mmfr0), | |
286 | ARM64_FTR_REG(SYS_ID_AA64MMFR1_EL1, ftr_id_aa64mmfr1), | |
287 | ||
288 | /* Op1 = 3, CRn = 0, CRm = 0 */ | |
289 | ARM64_FTR_REG(SYS_CTR_EL0, ftr_ctr), | |
290 | ARM64_FTR_REG(SYS_DCZID_EL0, ftr_dczid), | |
291 | ||
292 | /* Op1 = 3, CRn = 14, CRm = 0 */ | |
293 | ARM64_FTR_REG(SYS_CNTFRQ_EL0, ftr_generic32), | |
294 | }; | |
295 | ||
296 | static int search_cmp_ftr_reg(const void *id, const void *regp) | |
297 | { | |
298 | return (int)(unsigned long)id - (int)((const struct arm64_ftr_reg *)regp)->sys_id; | |
299 | } | |
300 | ||
301 | /* | |
302 | * get_arm64_ftr_reg - Lookup a feature register entry using its | |
303 | * sys_reg() encoding. With the array arm64_ftr_regs sorted in the | |
304 | * ascending order of sys_id , we use binary search to find a matching | |
305 | * entry. | |
306 | * | |
307 | * returns - Upon success, matching ftr_reg entry for id. | |
308 | * - NULL on failure. It is upto the caller to decide | |
309 | * the impact of a failure. | |
310 | */ | |
311 | static struct arm64_ftr_reg *get_arm64_ftr_reg(u32 sys_id) | |
312 | { | |
313 | return bsearch((const void *)(unsigned long)sys_id, | |
314 | arm64_ftr_regs, | |
315 | ARRAY_SIZE(arm64_ftr_regs), | |
316 | sizeof(arm64_ftr_regs[0]), | |
317 | search_cmp_ftr_reg); | |
318 | } | |
319 | ||
320 | static u64 arm64_ftr_set_value(struct arm64_ftr_bits *ftrp, s64 reg, s64 ftr_val) | |
321 | { | |
322 | u64 mask = arm64_ftr_mask(ftrp); | |
323 | ||
324 | reg &= ~mask; | |
325 | reg |= (ftr_val << ftrp->shift) & mask; | |
326 | return reg; | |
327 | } | |
328 | ||
329 | static s64 arm64_ftr_safe_value(struct arm64_ftr_bits *ftrp, s64 new, s64 cur) | |
330 | { | |
331 | s64 ret = 0; | |
332 | ||
333 | switch (ftrp->type) { | |
334 | case FTR_EXACT: | |
335 | ret = ftrp->safe_val; | |
336 | break; | |
337 | case FTR_LOWER_SAFE: | |
338 | ret = new < cur ? new : cur; | |
339 | break; | |
340 | case FTR_HIGHER_SAFE: | |
341 | ret = new > cur ? new : cur; | |
342 | break; | |
343 | default: | |
344 | BUG(); | |
345 | } | |
346 | ||
347 | return ret; | |
348 | } | |
349 | ||
350 | static int __init sort_cmp_ftr_regs(const void *a, const void *b) | |
351 | { | |
352 | return ((const struct arm64_ftr_reg *)a)->sys_id - | |
353 | ((const struct arm64_ftr_reg *)b)->sys_id; | |
354 | } | |
355 | ||
356 | static void __init swap_ftr_regs(void *a, void *b, int size) | |
357 | { | |
358 | struct arm64_ftr_reg tmp = *(struct arm64_ftr_reg *)a; | |
359 | *(struct arm64_ftr_reg *)a = *(struct arm64_ftr_reg *)b; | |
360 | *(struct arm64_ftr_reg *)b = tmp; | |
361 | } | |
362 | ||
363 | static void __init sort_ftr_regs(void) | |
364 | { | |
365 | /* Keep the array sorted so that we can do the binary search */ | |
366 | sort(arm64_ftr_regs, | |
367 | ARRAY_SIZE(arm64_ftr_regs), | |
368 | sizeof(arm64_ftr_regs[0]), | |
369 | sort_cmp_ftr_regs, | |
370 | swap_ftr_regs); | |
371 | } | |
372 | ||
373 | /* | |
374 | * Initialise the CPU feature register from Boot CPU values. | |
375 | * Also initiliases the strict_mask for the register. | |
376 | */ | |
377 | static void __init init_cpu_ftr_reg(u32 sys_reg, u64 new) | |
378 | { | |
379 | u64 val = 0; | |
380 | u64 strict_mask = ~0x0ULL; | |
381 | struct arm64_ftr_bits *ftrp; | |
382 | struct arm64_ftr_reg *reg = get_arm64_ftr_reg(sys_reg); | |
383 | ||
384 | BUG_ON(!reg); | |
385 | ||
386 | for (ftrp = reg->ftr_bits; ftrp->width; ftrp++) { | |
387 | s64 ftr_new = arm64_ftr_value(ftrp, new); | |
388 | ||
389 | val = arm64_ftr_set_value(ftrp, val, ftr_new); | |
390 | if (!ftrp->strict) | |
391 | strict_mask &= ~arm64_ftr_mask(ftrp); | |
392 | } | |
393 | reg->sys_val = val; | |
394 | reg->strict_mask = strict_mask; | |
395 | } | |
396 | ||
397 | void __init init_cpu_features(struct cpuinfo_arm64 *info) | |
398 | { | |
399 | /* Before we start using the tables, make sure it is sorted */ | |
400 | sort_ftr_regs(); | |
401 | ||
402 | init_cpu_ftr_reg(SYS_CTR_EL0, info->reg_ctr); | |
403 | init_cpu_ftr_reg(SYS_DCZID_EL0, info->reg_dczid); | |
404 | init_cpu_ftr_reg(SYS_CNTFRQ_EL0, info->reg_cntfrq); | |
405 | init_cpu_ftr_reg(SYS_ID_AA64DFR0_EL1, info->reg_id_aa64dfr0); | |
406 | init_cpu_ftr_reg(SYS_ID_AA64DFR1_EL1, info->reg_id_aa64dfr1); | |
407 | init_cpu_ftr_reg(SYS_ID_AA64ISAR0_EL1, info->reg_id_aa64isar0); | |
408 | init_cpu_ftr_reg(SYS_ID_AA64ISAR1_EL1, info->reg_id_aa64isar1); | |
409 | init_cpu_ftr_reg(SYS_ID_AA64MMFR0_EL1, info->reg_id_aa64mmfr0); | |
410 | init_cpu_ftr_reg(SYS_ID_AA64MMFR1_EL1, info->reg_id_aa64mmfr1); | |
411 | init_cpu_ftr_reg(SYS_ID_AA64PFR0_EL1, info->reg_id_aa64pfr0); | |
412 | init_cpu_ftr_reg(SYS_ID_AA64PFR1_EL1, info->reg_id_aa64pfr1); | |
413 | init_cpu_ftr_reg(SYS_ID_DFR0_EL1, info->reg_id_dfr0); | |
414 | init_cpu_ftr_reg(SYS_ID_ISAR0_EL1, info->reg_id_isar0); | |
415 | init_cpu_ftr_reg(SYS_ID_ISAR1_EL1, info->reg_id_isar1); | |
416 | init_cpu_ftr_reg(SYS_ID_ISAR2_EL1, info->reg_id_isar2); | |
417 | init_cpu_ftr_reg(SYS_ID_ISAR3_EL1, info->reg_id_isar3); | |
418 | init_cpu_ftr_reg(SYS_ID_ISAR4_EL1, info->reg_id_isar4); | |
419 | init_cpu_ftr_reg(SYS_ID_ISAR5_EL1, info->reg_id_isar5); | |
420 | init_cpu_ftr_reg(SYS_ID_MMFR0_EL1, info->reg_id_mmfr0); | |
421 | init_cpu_ftr_reg(SYS_ID_MMFR1_EL1, info->reg_id_mmfr1); | |
422 | init_cpu_ftr_reg(SYS_ID_MMFR2_EL1, info->reg_id_mmfr2); | |
423 | init_cpu_ftr_reg(SYS_ID_MMFR3_EL1, info->reg_id_mmfr3); | |
424 | init_cpu_ftr_reg(SYS_ID_PFR0_EL1, info->reg_id_pfr0); | |
425 | init_cpu_ftr_reg(SYS_ID_PFR1_EL1, info->reg_id_pfr1); | |
426 | init_cpu_ftr_reg(SYS_MVFR0_EL1, info->reg_mvfr0); | |
427 | init_cpu_ftr_reg(SYS_MVFR1_EL1, info->reg_mvfr1); | |
428 | init_cpu_ftr_reg(SYS_MVFR2_EL1, info->reg_mvfr2); | |
3c739b57 SP |
429 | } |
430 | ||
3086d391 | 431 | static void update_cpu_ftr_reg(struct arm64_ftr_reg *reg, u64 new) |
3c739b57 SP |
432 | { |
433 | struct arm64_ftr_bits *ftrp; | |
3c739b57 SP |
434 | |
435 | for (ftrp = reg->ftr_bits; ftrp->width; ftrp++) { | |
436 | s64 ftr_cur = arm64_ftr_value(ftrp, reg->sys_val); | |
437 | s64 ftr_new = arm64_ftr_value(ftrp, new); | |
438 | ||
439 | if (ftr_cur == ftr_new) | |
440 | continue; | |
441 | /* Find a safe value */ | |
442 | ftr_new = arm64_ftr_safe_value(ftrp, ftr_new, ftr_cur); | |
443 | reg->sys_val = arm64_ftr_set_value(ftrp, reg->sys_val, ftr_new); | |
444 | } | |
445 | ||
446 | } | |
447 | ||
3086d391 | 448 | static int check_update_ftr_reg(u32 sys_id, int cpu, u64 val, u64 boot) |
cdcf817b | 449 | { |
3086d391 SP |
450 | struct arm64_ftr_reg *regp = get_arm64_ftr_reg(sys_id); |
451 | ||
452 | BUG_ON(!regp); | |
453 | update_cpu_ftr_reg(regp, val); | |
454 | if ((boot & regp->strict_mask) == (val & regp->strict_mask)) | |
455 | return 0; | |
456 | pr_warn("SANITY CHECK: Unexpected variation in %s. Boot CPU: %#016llx, CPU%d: %#016llx\n", | |
457 | regp->name, boot, cpu, val); | |
458 | return 1; | |
459 | } | |
460 | ||
461 | /* | |
462 | * Update system wide CPU feature registers with the values from a | |
463 | * non-boot CPU. Also performs SANITY checks to make sure that there | |
464 | * aren't any insane variations from that of the boot CPU. | |
465 | */ | |
466 | void update_cpu_features(int cpu, | |
467 | struct cpuinfo_arm64 *info, | |
468 | struct cpuinfo_arm64 *boot) | |
469 | { | |
470 | int taint = 0; | |
471 | ||
472 | /* | |
473 | * The kernel can handle differing I-cache policies, but otherwise | |
474 | * caches should look identical. Userspace JITs will make use of | |
475 | * *minLine. | |
476 | */ | |
477 | taint |= check_update_ftr_reg(SYS_CTR_EL0, cpu, | |
478 | info->reg_ctr, boot->reg_ctr); | |
479 | ||
480 | /* | |
481 | * Userspace may perform DC ZVA instructions. Mismatched block sizes | |
482 | * could result in too much or too little memory being zeroed if a | |
483 | * process is preempted and migrated between CPUs. | |
484 | */ | |
485 | taint |= check_update_ftr_reg(SYS_DCZID_EL0, cpu, | |
486 | info->reg_dczid, boot->reg_dczid); | |
487 | ||
488 | /* If different, timekeeping will be broken (especially with KVM) */ | |
489 | taint |= check_update_ftr_reg(SYS_CNTFRQ_EL0, cpu, | |
490 | info->reg_cntfrq, boot->reg_cntfrq); | |
491 | ||
492 | /* | |
493 | * The kernel uses self-hosted debug features and expects CPUs to | |
494 | * support identical debug features. We presently need CTX_CMPs, WRPs, | |
495 | * and BRPs to be identical. | |
496 | * ID_AA64DFR1 is currently RES0. | |
497 | */ | |
498 | taint |= check_update_ftr_reg(SYS_ID_AA64DFR0_EL1, cpu, | |
499 | info->reg_id_aa64dfr0, boot->reg_id_aa64dfr0); | |
500 | taint |= check_update_ftr_reg(SYS_ID_AA64DFR1_EL1, cpu, | |
501 | info->reg_id_aa64dfr1, boot->reg_id_aa64dfr1); | |
502 | /* | |
503 | * Even in big.LITTLE, processors should be identical instruction-set | |
504 | * wise. | |
505 | */ | |
506 | taint |= check_update_ftr_reg(SYS_ID_AA64ISAR0_EL1, cpu, | |
507 | info->reg_id_aa64isar0, boot->reg_id_aa64isar0); | |
508 | taint |= check_update_ftr_reg(SYS_ID_AA64ISAR1_EL1, cpu, | |
509 | info->reg_id_aa64isar1, boot->reg_id_aa64isar1); | |
510 | ||
511 | /* | |
512 | * Differing PARange support is fine as long as all peripherals and | |
513 | * memory are mapped within the minimum PARange of all CPUs. | |
514 | * Linux should not care about secure memory. | |
515 | */ | |
516 | taint |= check_update_ftr_reg(SYS_ID_AA64MMFR0_EL1, cpu, | |
517 | info->reg_id_aa64mmfr0, boot->reg_id_aa64mmfr0); | |
518 | taint |= check_update_ftr_reg(SYS_ID_AA64MMFR1_EL1, cpu, | |
519 | info->reg_id_aa64mmfr1, boot->reg_id_aa64mmfr1); | |
520 | ||
521 | /* | |
522 | * EL3 is not our concern. | |
523 | * ID_AA64PFR1 is currently RES0. | |
524 | */ | |
525 | taint |= check_update_ftr_reg(SYS_ID_AA64PFR0_EL1, cpu, | |
526 | info->reg_id_aa64pfr0, boot->reg_id_aa64pfr0); | |
527 | taint |= check_update_ftr_reg(SYS_ID_AA64PFR1_EL1, cpu, | |
528 | info->reg_id_aa64pfr1, boot->reg_id_aa64pfr1); | |
529 | ||
530 | /* | |
531 | * If we have AArch32, we care about 32-bit features for compat. These | |
532 | * registers should be RES0 otherwise. | |
533 | */ | |
534 | taint |= check_update_ftr_reg(SYS_ID_DFR0_EL1, cpu, | |
535 | info->reg_id_dfr0, boot->reg_id_dfr0); | |
536 | taint |= check_update_ftr_reg(SYS_ID_ISAR0_EL1, cpu, | |
537 | info->reg_id_isar0, boot->reg_id_isar0); | |
538 | taint |= check_update_ftr_reg(SYS_ID_ISAR1_EL1, cpu, | |
539 | info->reg_id_isar1, boot->reg_id_isar1); | |
540 | taint |= check_update_ftr_reg(SYS_ID_ISAR2_EL1, cpu, | |
541 | info->reg_id_isar2, boot->reg_id_isar2); | |
542 | taint |= check_update_ftr_reg(SYS_ID_ISAR3_EL1, cpu, | |
543 | info->reg_id_isar3, boot->reg_id_isar3); | |
544 | taint |= check_update_ftr_reg(SYS_ID_ISAR4_EL1, cpu, | |
545 | info->reg_id_isar4, boot->reg_id_isar4); | |
546 | taint |= check_update_ftr_reg(SYS_ID_ISAR5_EL1, cpu, | |
547 | info->reg_id_isar5, boot->reg_id_isar5); | |
548 | ||
549 | /* | |
550 | * Regardless of the value of the AuxReg field, the AIFSR, ADFSR, and | |
551 | * ACTLR formats could differ across CPUs and therefore would have to | |
552 | * be trapped for virtualization anyway. | |
553 | */ | |
554 | taint |= check_update_ftr_reg(SYS_ID_MMFR0_EL1, cpu, | |
555 | info->reg_id_mmfr0, boot->reg_id_mmfr0); | |
556 | taint |= check_update_ftr_reg(SYS_ID_MMFR1_EL1, cpu, | |
557 | info->reg_id_mmfr1, boot->reg_id_mmfr1); | |
558 | taint |= check_update_ftr_reg(SYS_ID_MMFR2_EL1, cpu, | |
559 | info->reg_id_mmfr2, boot->reg_id_mmfr2); | |
560 | taint |= check_update_ftr_reg(SYS_ID_MMFR3_EL1, cpu, | |
561 | info->reg_id_mmfr3, boot->reg_id_mmfr3); | |
562 | taint |= check_update_ftr_reg(SYS_ID_PFR0_EL1, cpu, | |
563 | info->reg_id_pfr0, boot->reg_id_pfr0); | |
564 | taint |= check_update_ftr_reg(SYS_ID_PFR1_EL1, cpu, | |
565 | info->reg_id_pfr1, boot->reg_id_pfr1); | |
566 | taint |= check_update_ftr_reg(SYS_MVFR0_EL1, cpu, | |
567 | info->reg_mvfr0, boot->reg_mvfr0); | |
568 | taint |= check_update_ftr_reg(SYS_MVFR1_EL1, cpu, | |
569 | info->reg_mvfr1, boot->reg_mvfr1); | |
570 | taint |= check_update_ftr_reg(SYS_MVFR2_EL1, cpu, | |
571 | info->reg_mvfr2, boot->reg_mvfr2); | |
572 | ||
573 | /* | |
574 | * Mismatched CPU features are a recipe for disaster. Don't even | |
575 | * pretend to support them. | |
576 | */ | |
577 | WARN_TAINT_ONCE(taint, TAINT_CPU_OUT_OF_SPEC, | |
578 | "Unsupported CPU feature variation.\n"); | |
cdcf817b SP |
579 | } |
580 | ||
b3f15378 SP |
581 | u64 read_system_reg(u32 id) |
582 | { | |
583 | struct arm64_ftr_reg *regp = get_arm64_ftr_reg(id); | |
584 | ||
585 | /* We shouldn't get a request for an unsupported register */ | |
586 | BUG_ON(!regp); | |
587 | return regp->sys_val; | |
588 | } | |
359b7064 | 589 | |
963fcd40 MZ |
590 | #include <linux/irqchip/arm-gic-v3.h> |
591 | ||
18ffa046 JM |
592 | static bool |
593 | feature_matches(u64 reg, const struct arm64_cpu_capabilities *entry) | |
594 | { | |
595 | int val = cpuid_feature_extract_field(reg, entry->field_pos); | |
596 | ||
597 | return val >= entry->min_field_value; | |
598 | } | |
599 | ||
da8d02d1 SP |
600 | static bool |
601 | has_cpuid_feature(const struct arm64_cpu_capabilities *entry) | |
602 | { | |
603 | u64 val; | |
94a9e04a | 604 | |
da8d02d1 SP |
605 | val = read_system_reg(entry->sys_reg); |
606 | return feature_matches(val, entry); | |
607 | } | |
338d4f49 | 608 | |
963fcd40 MZ |
609 | static bool has_useable_gicv3_cpuif(const struct arm64_cpu_capabilities *entry) |
610 | { | |
611 | bool has_sre; | |
612 | ||
2dc10ad8 | 613 | if (!has_cpuid_feature(entry)) |
963fcd40 MZ |
614 | return false; |
615 | ||
616 | has_sre = gic_enable_sre(); | |
617 | if (!has_sre) | |
618 | pr_warn_once("%s present but disabled by higher exception level\n", | |
619 | entry->desc); | |
620 | ||
621 | return has_sre; | |
622 | } | |
623 | ||
d5370f75 WD |
624 | static bool has_no_hw_prefetch(const struct arm64_cpu_capabilities *entry) |
625 | { | |
626 | u32 midr = read_cpuid_id(); | |
627 | u32 rv_min, rv_max; | |
628 | ||
629 | /* Cavium ThunderX pass 1.x and 2.x */ | |
630 | rv_min = 0; | |
631 | rv_max = (1 << MIDR_VARIANT_SHIFT) | MIDR_REVISION_MASK; | |
632 | ||
633 | return MIDR_IS_CPU_MODEL_RANGE(midr, MIDR_THUNDERX, rv_min, rv_max); | |
634 | } | |
635 | ||
359b7064 | 636 | static const struct arm64_cpu_capabilities arm64_features[] = { |
94a9e04a MZ |
637 | { |
638 | .desc = "GIC system register CPU interface", | |
639 | .capability = ARM64_HAS_SYSREG_GIC_CPUIF, | |
963fcd40 | 640 | .matches = has_useable_gicv3_cpuif, |
da8d02d1 SP |
641 | .sys_reg = SYS_ID_AA64PFR0_EL1, |
642 | .field_pos = ID_AA64PFR0_GIC_SHIFT, | |
18ffa046 | 643 | .min_field_value = 1, |
94a9e04a | 644 | }, |
338d4f49 JM |
645 | #ifdef CONFIG_ARM64_PAN |
646 | { | |
647 | .desc = "Privileged Access Never", | |
648 | .capability = ARM64_HAS_PAN, | |
da8d02d1 SP |
649 | .matches = has_cpuid_feature, |
650 | .sys_reg = SYS_ID_AA64MMFR1_EL1, | |
651 | .field_pos = ID_AA64MMFR1_PAN_SHIFT, | |
338d4f49 JM |
652 | .min_field_value = 1, |
653 | .enable = cpu_enable_pan, | |
654 | }, | |
655 | #endif /* CONFIG_ARM64_PAN */ | |
2e94da13 WD |
656 | #if defined(CONFIG_AS_LSE) && defined(CONFIG_ARM64_LSE_ATOMICS) |
657 | { | |
658 | .desc = "LSE atomic instructions", | |
659 | .capability = ARM64_HAS_LSE_ATOMICS, | |
da8d02d1 SP |
660 | .matches = has_cpuid_feature, |
661 | .sys_reg = SYS_ID_AA64ISAR0_EL1, | |
662 | .field_pos = ID_AA64ISAR0_ATOMICS_SHIFT, | |
2e94da13 WD |
663 | .min_field_value = 2, |
664 | }, | |
665 | #endif /* CONFIG_AS_LSE && CONFIG_ARM64_LSE_ATOMICS */ | |
d5370f75 WD |
666 | { |
667 | .desc = "Software prefetching using PRFM", | |
668 | .capability = ARM64_HAS_NO_HW_PREFETCH, | |
669 | .matches = has_no_hw_prefetch, | |
670 | }, | |
359b7064 MZ |
671 | {}, |
672 | }; | |
673 | ||
37b01d53 SP |
674 | #define HWCAP_CAP(reg, field, min_value, type, cap) \ |
675 | { \ | |
676 | .desc = #cap, \ | |
677 | .matches = has_cpuid_feature, \ | |
678 | .sys_reg = reg, \ | |
679 | .field_pos = field, \ | |
680 | .min_field_value = min_value, \ | |
681 | .hwcap_type = type, \ | |
682 | .hwcap = cap, \ | |
683 | } | |
684 | ||
685 | static const struct arm64_cpu_capabilities arm64_hwcaps[] = { | |
686 | HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_AES_SHIFT, 2, CAP_HWCAP, HWCAP_PMULL), | |
687 | HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_AES_SHIFT, 1, CAP_HWCAP, HWCAP_AES), | |
688 | HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_SHA1_SHIFT, 1, CAP_HWCAP, HWCAP_SHA1), | |
689 | HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_SHA2_SHIFT, 1, CAP_HWCAP, HWCAP_SHA2), | |
690 | HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_CRC32_SHIFT, 1, CAP_HWCAP, HWCAP_CRC32), | |
691 | HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_ATOMICS_SHIFT, 2, CAP_HWCAP, HWCAP_ATOMICS), | |
fe80f9f2 SP |
692 | HWCAP_CAP(SYS_ID_AA64PFR0_EL1, ID_AA64PFR0_FP_SHIFT, 0, CAP_HWCAP, HWCAP_FP), |
693 | HWCAP_CAP(SYS_ID_AA64PFR0_EL1, ID_AA64PFR0_ASIMD_SHIFT, 0, CAP_HWCAP, HWCAP_ASIMD), | |
37b01d53 SP |
694 | #ifdef CONFIG_COMPAT |
695 | HWCAP_CAP(SYS_ID_ISAR5_EL1, ID_ISAR5_AES_SHIFT, 2, CAP_COMPAT_HWCAP2, COMPAT_HWCAP2_PMULL), | |
696 | HWCAP_CAP(SYS_ID_ISAR5_EL1, ID_ISAR5_AES_SHIFT, 1, CAP_COMPAT_HWCAP2, COMPAT_HWCAP2_AES), | |
697 | HWCAP_CAP(SYS_ID_ISAR5_EL1, ID_ISAR5_SHA1_SHIFT, 1, CAP_COMPAT_HWCAP2, COMPAT_HWCAP2_SHA1), | |
698 | HWCAP_CAP(SYS_ID_ISAR5_EL1, ID_ISAR5_SHA2_SHIFT, 1, CAP_COMPAT_HWCAP2, COMPAT_HWCAP2_SHA2), | |
699 | HWCAP_CAP(SYS_ID_ISAR5_EL1, ID_ISAR5_CRC32_SHIFT, 1, CAP_COMPAT_HWCAP2, COMPAT_HWCAP2_CRC32), | |
700 | #endif | |
701 | {}, | |
702 | }; | |
703 | ||
a7c61a34 | 704 | static void __init cap_set_hwcap(const struct arm64_cpu_capabilities *cap) |
37b01d53 SP |
705 | { |
706 | switch (cap->hwcap_type) { | |
707 | case CAP_HWCAP: | |
708 | elf_hwcap |= cap->hwcap; | |
709 | break; | |
710 | #ifdef CONFIG_COMPAT | |
711 | case CAP_COMPAT_HWCAP: | |
712 | compat_elf_hwcap |= (u32)cap->hwcap; | |
713 | break; | |
714 | case CAP_COMPAT_HWCAP2: | |
715 | compat_elf_hwcap2 |= (u32)cap->hwcap; | |
716 | break; | |
717 | #endif | |
718 | default: | |
719 | WARN_ON(1); | |
720 | break; | |
721 | } | |
722 | } | |
723 | ||
724 | /* Check if we have a particular HWCAP enabled */ | |
3d6d1035 | 725 | static bool __maybe_unused cpus_have_hwcap(const struct arm64_cpu_capabilities *cap) |
37b01d53 SP |
726 | { |
727 | bool rc; | |
728 | ||
729 | switch (cap->hwcap_type) { | |
730 | case CAP_HWCAP: | |
731 | rc = (elf_hwcap & cap->hwcap) != 0; | |
732 | break; | |
733 | #ifdef CONFIG_COMPAT | |
734 | case CAP_COMPAT_HWCAP: | |
735 | rc = (compat_elf_hwcap & (u32)cap->hwcap) != 0; | |
736 | break; | |
737 | case CAP_COMPAT_HWCAP2: | |
738 | rc = (compat_elf_hwcap2 & (u32)cap->hwcap) != 0; | |
739 | break; | |
740 | #endif | |
741 | default: | |
742 | WARN_ON(1); | |
743 | rc = false; | |
744 | } | |
745 | ||
746 | return rc; | |
747 | } | |
748 | ||
a7c61a34 | 749 | static void __init setup_cpu_hwcaps(void) |
37b01d53 SP |
750 | { |
751 | int i; | |
752 | const struct arm64_cpu_capabilities *hwcaps = arm64_hwcaps; | |
753 | ||
754 | for (i = 0; hwcaps[i].desc; i++) | |
755 | if (hwcaps[i].matches(&hwcaps[i])) | |
756 | cap_set_hwcap(&hwcaps[i]); | |
757 | } | |
758 | ||
ce8b602c | 759 | void update_cpu_capabilities(const struct arm64_cpu_capabilities *caps, |
359b7064 MZ |
760 | const char *info) |
761 | { | |
762 | int i; | |
763 | ||
764 | for (i = 0; caps[i].desc; i++) { | |
765 | if (!caps[i].matches(&caps[i])) | |
766 | continue; | |
767 | ||
768 | if (!cpus_have_cap(caps[i].capability)) | |
769 | pr_info("%s %s\n", info, caps[i].desc); | |
770 | cpus_set_cap(caps[i].capability); | |
771 | } | |
ce8b602c SP |
772 | } |
773 | ||
774 | /* | |
dbb4e152 SP |
775 | * Run through the enabled capabilities and enable() it on all active |
776 | * CPUs | |
ce8b602c | 777 | */ |
a7c61a34 JZ |
778 | static void __init |
779 | enable_cpu_capabilities(const struct arm64_cpu_capabilities *caps) | |
ce8b602c SP |
780 | { |
781 | int i; | |
1c076303 | 782 | |
dbb4e152 SP |
783 | for (i = 0; caps[i].desc; i++) |
784 | if (caps[i].enable && cpus_have_cap(caps[i].capability)) | |
785 | on_each_cpu(caps[i].enable, NULL, true); | |
786 | } | |
787 | ||
788 | #ifdef CONFIG_HOTPLUG_CPU | |
789 | ||
790 | /* | |
791 | * Flag to indicate if we have computed the system wide | |
792 | * capabilities based on the boot time active CPUs. This | |
793 | * will be used to determine if a new booting CPU should | |
794 | * go through the verification process to make sure that it | |
795 | * supports the system capabilities, without using a hotplug | |
796 | * notifier. | |
797 | */ | |
798 | static bool sys_caps_initialised; | |
799 | ||
800 | static inline void set_sys_caps_initialised(void) | |
801 | { | |
802 | sys_caps_initialised = true; | |
803 | } | |
804 | ||
da8d02d1 SP |
805 | /* |
806 | * __raw_read_system_reg() - Used by a STARTING cpu before cpuinfo is populated. | |
807 | */ | |
808 | static u64 __raw_read_system_reg(u32 sys_id) | |
809 | { | |
810 | switch (sys_id) { | |
0f54b14e JM |
811 | case SYS_ID_PFR0_EL1: return read_cpuid(SYS_ID_PFR0_EL1); |
812 | case SYS_ID_PFR1_EL1: return read_cpuid(SYS_ID_PFR1_EL1); | |
813 | case SYS_ID_DFR0_EL1: return read_cpuid(SYS_ID_DFR0_EL1); | |
814 | case SYS_ID_MMFR0_EL1: return read_cpuid(SYS_ID_MMFR0_EL1); | |
815 | case SYS_ID_MMFR1_EL1: return read_cpuid(SYS_ID_MMFR1_EL1); | |
816 | case SYS_ID_MMFR2_EL1: return read_cpuid(SYS_ID_MMFR2_EL1); | |
817 | case SYS_ID_MMFR3_EL1: return read_cpuid(SYS_ID_MMFR3_EL1); | |
818 | case SYS_ID_ISAR0_EL1: return read_cpuid(SYS_ID_ISAR0_EL1); | |
819 | case SYS_ID_ISAR1_EL1: return read_cpuid(SYS_ID_ISAR1_EL1); | |
820 | case SYS_ID_ISAR2_EL1: return read_cpuid(SYS_ID_ISAR2_EL1); | |
821 | case SYS_ID_ISAR3_EL1: return read_cpuid(SYS_ID_ISAR3_EL1); | |
822 | case SYS_ID_ISAR4_EL1: return read_cpuid(SYS_ID_ISAR4_EL1); | |
823 | case SYS_ID_ISAR5_EL1: return read_cpuid(SYS_ID_ISAR4_EL1); | |
824 | case SYS_MVFR0_EL1: return read_cpuid(SYS_MVFR0_EL1); | |
825 | case SYS_MVFR1_EL1: return read_cpuid(SYS_MVFR1_EL1); | |
826 | case SYS_MVFR2_EL1: return read_cpuid(SYS_MVFR2_EL1); | |
827 | ||
828 | case SYS_ID_AA64PFR0_EL1: return read_cpuid(SYS_ID_AA64PFR0_EL1); | |
829 | case SYS_ID_AA64PFR1_EL1: return read_cpuid(SYS_ID_AA64PFR0_EL1); | |
830 | case SYS_ID_AA64DFR0_EL1: return read_cpuid(SYS_ID_AA64DFR0_EL1); | |
831 | case SYS_ID_AA64DFR1_EL1: return read_cpuid(SYS_ID_AA64DFR0_EL1); | |
832 | case SYS_ID_AA64MMFR0_EL1: return read_cpuid(SYS_ID_AA64MMFR0_EL1); | |
833 | case SYS_ID_AA64MMFR1_EL1: return read_cpuid(SYS_ID_AA64MMFR1_EL1); | |
834 | case SYS_ID_AA64ISAR0_EL1: return read_cpuid(SYS_ID_AA64ISAR0_EL1); | |
835 | case SYS_ID_AA64ISAR1_EL1: return read_cpuid(SYS_ID_AA64ISAR1_EL1); | |
836 | ||
837 | case SYS_CNTFRQ_EL0: return read_cpuid(SYS_CNTFRQ_EL0); | |
838 | case SYS_CTR_EL0: return read_cpuid(SYS_CTR_EL0); | |
839 | case SYS_DCZID_EL0: return read_cpuid(SYS_DCZID_EL0); | |
da8d02d1 SP |
840 | default: |
841 | BUG(); | |
842 | return 0; | |
843 | } | |
844 | } | |
845 | ||
dbb4e152 SP |
846 | /* |
847 | * Park the CPU which doesn't have the capability as advertised | |
848 | * by the system. | |
849 | */ | |
850 | static void fail_incapable_cpu(char *cap_type, | |
851 | const struct arm64_cpu_capabilities *cap) | |
852 | { | |
853 | int cpu = smp_processor_id(); | |
854 | ||
855 | pr_crit("CPU%d: missing %s : %s\n", cpu, cap_type, cap->desc); | |
856 | /* Mark this CPU absent */ | |
857 | set_cpu_present(cpu, 0); | |
858 | ||
859 | /* Check if we can park ourselves */ | |
860 | if (cpu_ops[cpu] && cpu_ops[cpu]->cpu_die) | |
861 | cpu_ops[cpu]->cpu_die(cpu); | |
862 | asm( | |
863 | "1: wfe\n" | |
864 | " wfi\n" | |
865 | " b 1b"); | |
866 | } | |
1c076303 | 867 | |
dbb4e152 SP |
868 | /* |
869 | * Run through the enabled system capabilities and enable() it on this CPU. | |
870 | * The capabilities were decided based on the available CPUs at the boot time. | |
871 | * Any new CPU should match the system wide status of the capability. If the | |
872 | * new CPU doesn't have a capability which the system now has enabled, we | |
873 | * cannot do anything to fix it up and could cause unexpected failures. So | |
874 | * we park the CPU. | |
875 | */ | |
876 | void verify_local_cpu_capabilities(void) | |
877 | { | |
878 | int i; | |
879 | const struct arm64_cpu_capabilities *caps; | |
880 | ||
881 | /* | |
882 | * If we haven't computed the system capabilities, there is nothing | |
883 | * to verify. | |
884 | */ | |
885 | if (!sys_caps_initialised) | |
886 | return; | |
887 | ||
888 | caps = arm64_features; | |
1c076303 | 889 | for (i = 0; caps[i].desc; i++) { |
da8d02d1 | 890 | if (!cpus_have_cap(caps[i].capability) || !caps[i].sys_reg) |
dbb4e152 SP |
891 | continue; |
892 | /* | |
893 | * If the new CPU misses an advertised feature, we cannot proceed | |
894 | * further, park the cpu. | |
895 | */ | |
da8d02d1 | 896 | if (!feature_matches(__raw_read_system_reg(caps[i].sys_reg), &caps[i])) |
dbb4e152 SP |
897 | fail_incapable_cpu("arm64_features", &caps[i]); |
898 | if (caps[i].enable) | |
899 | caps[i].enable(NULL); | |
1c076303 | 900 | } |
37b01d53 SP |
901 | |
902 | for (i = 0, caps = arm64_hwcaps; caps[i].desc; i++) { | |
903 | if (!cpus_have_hwcap(&caps[i])) | |
904 | continue; | |
905 | if (!feature_matches(__raw_read_system_reg(caps[i].sys_reg), &caps[i])) | |
906 | fail_incapable_cpu("arm64_hwcaps", &caps[i]); | |
907 | } | |
359b7064 MZ |
908 | } |
909 | ||
dbb4e152 SP |
910 | #else /* !CONFIG_HOTPLUG_CPU */ |
911 | ||
912 | static inline void set_sys_caps_initialised(void) | |
913 | { | |
914 | } | |
915 | ||
916 | #endif /* CONFIG_HOTPLUG_CPU */ | |
917 | ||
a7c61a34 | 918 | static void __init setup_feature_capabilities(void) |
359b7064 | 919 | { |
ce8b602c SP |
920 | update_cpu_capabilities(arm64_features, "detected feature:"); |
921 | enable_cpu_capabilities(arm64_features); | |
359b7064 MZ |
922 | } |
923 | ||
9cdf8ec4 | 924 | void __init setup_cpu_features(void) |
359b7064 | 925 | { |
9cdf8ec4 SP |
926 | u32 cwg; |
927 | int cls; | |
928 | ||
dbb4e152 SP |
929 | /* Set the CPU feature capabilies */ |
930 | setup_feature_capabilities(); | |
37b01d53 | 931 | setup_cpu_hwcaps(); |
dbb4e152 SP |
932 | |
933 | /* Advertise that we have computed the system capabilities */ | |
934 | set_sys_caps_initialised(); | |
935 | ||
9cdf8ec4 SP |
936 | /* |
937 | * Check for sane CTR_EL0.CWG value. | |
938 | */ | |
939 | cwg = cache_type_cwg(); | |
940 | cls = cache_line_size(); | |
941 | if (!cwg) | |
942 | pr_warn("No Cache Writeback Granule information, assuming cache line size %d\n", | |
943 | cls); | |
944 | if (L1_CACHE_BYTES < cls) | |
945 | pr_warn("L1_CACHE_BYTES smaller than the Cache Writeback Granule (%d < %d)\n", | |
946 | L1_CACHE_BYTES, cls); | |
359b7064 | 947 | } |