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caab277b | 1 | // SPDX-License-Identifier: GPL-2.0-only |
359b7064 MZ |
2 | /* |
3 | * Contains CPU feature definitions | |
4 | * | |
5 | * Copyright (C) 2015 ARM Ltd. | |
a2a69963 WD |
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. | |
433022b5 WD |
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. | |
359b7064 MZ |
61 | */ |
62 | ||
9cdf8ec4 | 63 | #define pr_fmt(fmt) "CPU features: " fmt |
359b7064 | 64 | |
3c739b57 | 65 | #include <linux/bsearch.h> |
2a6dcb2b | 66 | #include <linux/cpumask.h> |
5ffdfaed | 67 | #include <linux/crash_dump.h> |
3c739b57 | 68 | #include <linux/sort.h> |
2a6dcb2b | 69 | #include <linux/stop_machine.h> |
359b7064 | 70 | #include <linux/types.h> |
2077be67 | 71 | #include <linux/mm.h> |
a111b7c0 | 72 | #include <linux/cpu.h> |
359b7064 MZ |
73 | #include <asm/cpu.h> |
74 | #include <asm/cpufeature.h> | |
dbb4e152 | 75 | #include <asm/cpu_ops.h> |
2e0f2478 | 76 | #include <asm/fpsimd.h> |
13f417f3 | 77 | #include <asm/mmu_context.h> |
338d4f49 | 78 | #include <asm/processor.h> |
cdcf817b | 79 | #include <asm/sysreg.h> |
77c97b4e | 80 | #include <asm/traps.h> |
d88701be | 81 | #include <asm/virt.h> |
359b7064 | 82 | |
aec0bff7 AM |
83 | /* Kernel representation of AT_HWCAP and AT_HWCAP2 */ |
84 | static unsigned long elf_hwcap __read_mostly; | |
9cdf8ec4 SP |
85 | |
86 | #ifdef CONFIG_COMPAT | |
87 | #define COMPAT_ELF_HWCAP_DEFAULT \ | |
88 | (COMPAT_HWCAP_HALF|COMPAT_HWCAP_THUMB|\ | |
89 | COMPAT_HWCAP_FAST_MULT|COMPAT_HWCAP_EDSP|\ | |
7559950a | 90 | COMPAT_HWCAP_TLS|COMPAT_HWCAP_IDIV|\ |
9cdf8ec4 SP |
91 | COMPAT_HWCAP_LPAE) |
92 | unsigned int compat_elf_hwcap __read_mostly = COMPAT_ELF_HWCAP_DEFAULT; | |
93 | unsigned int compat_elf_hwcap2 __read_mostly; | |
94 | #endif | |
95 | ||
96 | DECLARE_BITMAP(cpu_hwcaps, ARM64_NCAPS); | |
4b65a5db | 97 | EXPORT_SYMBOL(cpu_hwcaps); |
82a3a21b | 98 | static struct arm64_cpu_capabilities const __ro_after_init *cpu_hwcaps_ptrs[ARM64_NCAPS]; |
9cdf8ec4 | 99 | |
0ceb0d56 DT |
100 | /* Need also bit for ARM64_CB_PATCH */ |
101 | DECLARE_BITMAP(boot_capabilities, ARM64_NPATCHABLE); | |
102 | ||
09e3c22a MB |
103 | bool arm64_use_ng_mappings = false; |
104 | EXPORT_SYMBOL(arm64_use_ng_mappings); | |
105 | ||
8f1eec57 DM |
106 | /* |
107 | * Flag to indicate if we have computed the system wide | |
108 | * capabilities based on the boot time active CPUs. This | |
109 | * will be used to determine if a new booting CPU should | |
110 | * go through the verification process to make sure that it | |
111 | * supports the system capabilities, without using a hotplug | |
b51c6ac2 SP |
112 | * notifier. This is also used to decide if we could use |
113 | * the fast path for checking constant CPU caps. | |
8f1eec57 | 114 | */ |
b51c6ac2 SP |
115 | DEFINE_STATIC_KEY_FALSE(arm64_const_caps_ready); |
116 | EXPORT_SYMBOL(arm64_const_caps_ready); | |
117 | static inline void finalize_system_capabilities(void) | |
8f1eec57 | 118 | { |
b51c6ac2 | 119 | static_branch_enable(&arm64_const_caps_ready); |
8f1eec57 DM |
120 | } |
121 | ||
638d5031 | 122 | void dump_cpu_features(void) |
8effeaaf MR |
123 | { |
124 | /* file-wide pr_fmt adds "CPU features: " prefix */ | |
125 | pr_emerg("0x%*pb\n", ARM64_NCAPS, &cpu_hwcaps); | |
8effeaaf | 126 | } |
8effeaaf | 127 | |
efd9e03f CM |
128 | DEFINE_STATIC_KEY_ARRAY_FALSE(cpu_hwcap_keys, ARM64_NCAPS); |
129 | EXPORT_SYMBOL(cpu_hwcap_keys); | |
130 | ||
fe4fbdbc | 131 | #define __ARM64_FTR_BITS(SIGNED, VISIBLE, STRICT, TYPE, SHIFT, WIDTH, SAFE_VAL) \ |
3c739b57 | 132 | { \ |
4f0a606b | 133 | .sign = SIGNED, \ |
fe4fbdbc | 134 | .visible = VISIBLE, \ |
3c739b57 SP |
135 | .strict = STRICT, \ |
136 | .type = TYPE, \ | |
137 | .shift = SHIFT, \ | |
138 | .width = WIDTH, \ | |
139 | .safe_val = SAFE_VAL, \ | |
140 | } | |
141 | ||
0710cfdb | 142 | /* Define a feature with unsigned values */ |
fe4fbdbc SP |
143 | #define ARM64_FTR_BITS(VISIBLE, STRICT, TYPE, SHIFT, WIDTH, SAFE_VAL) \ |
144 | __ARM64_FTR_BITS(FTR_UNSIGNED, VISIBLE, STRICT, TYPE, SHIFT, WIDTH, SAFE_VAL) | |
4f0a606b | 145 | |
0710cfdb | 146 | /* Define a feature with a signed value */ |
fe4fbdbc SP |
147 | #define S_ARM64_FTR_BITS(VISIBLE, STRICT, TYPE, SHIFT, WIDTH, SAFE_VAL) \ |
148 | __ARM64_FTR_BITS(FTR_SIGNED, VISIBLE, STRICT, TYPE, SHIFT, WIDTH, SAFE_VAL) | |
0710cfdb | 149 | |
3c739b57 SP |
150 | #define ARM64_FTR_END \ |
151 | { \ | |
152 | .width = 0, \ | |
153 | } | |
154 | ||
70544196 JM |
155 | /* meta feature for alternatives */ |
156 | static bool __maybe_unused | |
92406f0c SP |
157 | cpufeature_pan_not_uao(const struct arm64_cpu_capabilities *entry, int __unused); |
158 | ||
5ffdfaed | 159 | static void cpu_enable_cnp(struct arm64_cpu_capabilities const *cap); |
70544196 | 160 | |
3ff047f6 ADK |
161 | static bool __system_matches_cap(unsigned int n); |
162 | ||
4aa8a472 SP |
163 | /* |
164 | * NOTE: Any changes to the visibility of features should be kept in | |
165 | * sync with the documentation of the CPU feature register ABI. | |
166 | */ | |
5e49d73c | 167 | static const struct arm64_ftr_bits ftr_id_aa64isar0[] = { |
1a50ec0b | 168 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_RNDR_SHIFT, 4, 0), |
7cd51a5a | 169 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_TLB_SHIFT, 4, 0), |
7206dc93 | 170 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_TS_SHIFT, 4, 0), |
3b3b6810 | 171 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_FHM_SHIFT, 4, 0), |
5bdecb79 SP |
172 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_DP_SHIFT, 4, 0), |
173 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_SM4_SHIFT, 4, 0), | |
174 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_SM3_SHIFT, 4, 0), | |
175 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_SHA3_SHIFT, 4, 0), | |
176 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_RDM_SHIFT, 4, 0), | |
fe4fbdbc SP |
177 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_ATOMICS_SHIFT, 4, 0), |
178 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_CRC32_SHIFT, 4, 0), | |
179 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_SHA2_SHIFT, 4, 0), | |
180 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_SHA1_SHIFT, 4, 0), | |
181 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_AES_SHIFT, 4, 0), | |
3c739b57 SP |
182 | ARM64_FTR_END, |
183 | }; | |
184 | ||
c8c3798d | 185 | static const struct arm64_ftr_bits ftr_id_aa64isar1[] = { |
d4209d8b SP |
186 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_I8MM_SHIFT, 4, 0), |
187 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_DGH_SHIFT, 4, 0), | |
188 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_BF16_SHIFT, 4, 0), | |
189 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_SPECRES_SHIFT, 4, 0), | |
bd4fb6d2 | 190 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_SB_SHIFT, 4, 0), |
7230f7e9 | 191 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_FRINTTS_SHIFT, 4, 0), |
6984eb47 MR |
192 | ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_PTR_AUTH), |
193 | FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_GPI_SHIFT, 4, 0), | |
194 | ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_PTR_AUTH), | |
195 | FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_GPA_SHIFT, 4, 0), | |
5bdecb79 SP |
196 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_LRCPC_SHIFT, 4, 0), |
197 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_FCMA_SHIFT, 4, 0), | |
198 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_JSCVT_SHIFT, 4, 0), | |
6984eb47 MR |
199 | ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_PTR_AUTH), |
200 | FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_API_SHIFT, 4, 0), | |
201 | ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_PTR_AUTH), | |
202 | FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_APA_SHIFT, 4, 0), | |
5bdecb79 | 203 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_DPB_SHIFT, 4, 0), |
c8c3798d SP |
204 | ARM64_FTR_END, |
205 | }; | |
206 | ||
5e49d73c | 207 | static const struct arm64_ftr_bits ftr_id_aa64pfr0[] = { |
179a56f6 | 208 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64PFR0_CSV3_SHIFT, 4, 0), |
0f15adbb | 209 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64PFR0_CSV2_SHIFT, 4, 0), |
7206dc93 | 210 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR0_DIT_SHIFT, 4, 0), |
2c9d45b4 | 211 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64PFR0_AMU_SHIFT, 4, 0), |
011e5f5b AK |
212 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR0_MPAM_SHIFT, 4, 0), |
213 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64PFR0_SEL2_SHIFT, 4, 0), | |
3fab3999 DM |
214 | ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), |
215 | FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR0_SVE_SHIFT, 4, 0), | |
64c02720 | 216 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR0_RAS_SHIFT, 4, 0), |
5bdecb79 | 217 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR0_GIC_SHIFT, 4, 0), |
fe4fbdbc SP |
218 | S_ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR0_ASIMD_SHIFT, 4, ID_AA64PFR0_ASIMD_NI), |
219 | S_ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR0_FP_SHIFT, 4, ID_AA64PFR0_FP_NI), | |
5bdecb79 | 220 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64PFR0_EL3_SHIFT, 4, 0), |
98448cdf WD |
221 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64PFR0_EL2_SHIFT, 4, 0), |
222 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64PFR0_EL1_SHIFT, 4, ID_AA64PFR0_EL1_64BIT_ONLY), | |
223 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64PFR0_EL0_SHIFT, 4, ID_AA64PFR0_EL0_64BIT_ONLY), | |
3c739b57 SP |
224 | ARM64_FTR_END, |
225 | }; | |
226 | ||
d71be2b6 | 227 | static const struct arm64_ftr_bits ftr_id_aa64pfr1[] = { |
14e270fa AK |
228 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR1_MPAMFRAC_SHIFT, 4, 0), |
229 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR1_RASFRAC_SHIFT, 4, 0), | |
d71be2b6 | 230 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR1_SSBS_SHIFT, 4, ID_AA64PFR1_SSBS_PSTATE_NI), |
8ef8f360 DM |
231 | ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_BTI), |
232 | FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR1_BT_SHIFT, 4, 0), | |
d71be2b6 WD |
233 | ARM64_FTR_END, |
234 | }; | |
235 | ||
06a916fe | 236 | static const struct arm64_ftr_bits ftr_id_aa64zfr0[] = { |
d4209d8b SP |
237 | ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), |
238 | FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_F64MM_SHIFT, 4, 0), | |
239 | ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), | |
240 | FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_F32MM_SHIFT, 4, 0), | |
241 | ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), | |
242 | FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_I8MM_SHIFT, 4, 0), | |
ec52c713 JG |
243 | ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), |
244 | FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_SM4_SHIFT, 4, 0), | |
245 | ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), | |
246 | FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_SHA3_SHIFT, 4, 0), | |
d4209d8b SP |
247 | ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), |
248 | FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_BF16_SHIFT, 4, 0), | |
ec52c713 JG |
249 | ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), |
250 | FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_BITPERM_SHIFT, 4, 0), | |
251 | ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), | |
252 | FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_AES_SHIFT, 4, 0), | |
253 | ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), | |
254 | FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_SVEVER_SHIFT, 4, 0), | |
06a916fe DM |
255 | ARM64_FTR_END, |
256 | }; | |
257 | ||
5e49d73c | 258 | static const struct arm64_ftr_bits ftr_id_aa64mmfr0[] = { |
bc67f10a AK |
259 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_ECV_SHIFT, 4, 0), |
260 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_FGT_SHIFT, 4, 0), | |
261 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_EXS_SHIFT, 4, 0), | |
b130a8f7 MZ |
262 | /* |
263 | * Page size not being supported at Stage-2 is not fatal. You | |
264 | * just give up KVM if PAGE_SIZE isn't supported there. Go fix | |
265 | * your favourite nesting hypervisor. | |
266 | * | |
267 | * There is a small corner case where the hypervisor explicitly | |
268 | * advertises a given granule size at Stage-2 (value 2) on some | |
269 | * vCPUs, and uses the fallback to Stage-1 (value 0) for other | |
270 | * vCPUs. Although this is not forbidden by the architecture, it | |
271 | * indicates that the hypervisor is being silly (or buggy). | |
272 | * | |
273 | * We make no effort to cope with this and pretend that if these | |
274 | * fields are inconsistent across vCPUs, then it isn't worth | |
275 | * trying to bring KVM up. | |
276 | */ | |
277 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_EXACT, ID_AA64MMFR0_TGRAN4_2_SHIFT, 4, 1), | |
278 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_EXACT, ID_AA64MMFR0_TGRAN64_2_SHIFT, 4, 1), | |
279 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_EXACT, ID_AA64MMFR0_TGRAN16_2_SHIFT, 4, 1), | |
5717fe5a WD |
280 | /* |
281 | * We already refuse to boot CPUs that don't support our configured | |
282 | * page size, so we can only detect mismatches for a page size other | |
283 | * than the one we're currently using. Unfortunately, SoCs like this | |
284 | * exist in the wild so, even though we don't like it, we'll have to go | |
285 | * along with it and treat them as non-strict. | |
286 | */ | |
287 | S_ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_TGRAN4_SHIFT, 4, ID_AA64MMFR0_TGRAN4_NI), | |
288 | S_ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_TGRAN64_SHIFT, 4, ID_AA64MMFR0_TGRAN64_NI), | |
289 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_TGRAN16_SHIFT, 4, ID_AA64MMFR0_TGRAN16_NI), | |
290 | ||
5bdecb79 | 291 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_BIGENDEL0_SHIFT, 4, 0), |
3c739b57 | 292 | /* Linux shouldn't care about secure memory */ |
5bdecb79 SP |
293 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_SNSMEM_SHIFT, 4, 0), |
294 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_BIGENDEL_SHIFT, 4, 0), | |
295 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_ASID_SHIFT, 4, 0), | |
3c739b57 SP |
296 | /* |
297 | * Differing PARange is fine as long as all peripherals and memory are mapped | |
298 | * within the minimum PARange of all CPUs | |
299 | */ | |
fe4fbdbc | 300 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_PARANGE_SHIFT, 4, 0), |
3c739b57 SP |
301 | ARM64_FTR_END, |
302 | }; | |
303 | ||
5e49d73c | 304 | static const struct arm64_ftr_bits ftr_id_aa64mmfr1[] = { |
853772ba AK |
305 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_ETS_SHIFT, 4, 0), |
306 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_TWED_SHIFT, 4, 0), | |
307 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_XNX_SHIFT, 4, 0), | |
308 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_HIGHER_SAFE, ID_AA64MMFR1_SPECSEI_SHIFT, 4, 0), | |
fe4fbdbc | 309 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_PAN_SHIFT, 4, 0), |
5bdecb79 SP |
310 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_LOR_SHIFT, 4, 0), |
311 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_HPD_SHIFT, 4, 0), | |
312 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_VHE_SHIFT, 4, 0), | |
313 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_VMIDBITS_SHIFT, 4, 0), | |
314 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_HADBS_SHIFT, 4, 0), | |
3c739b57 SP |
315 | ARM64_FTR_END, |
316 | }; | |
317 | ||
5e49d73c | 318 | static const struct arm64_ftr_bits ftr_id_aa64mmfr2[] = { |
3e6c69a0 | 319 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_E0PD_SHIFT, 4, 0), |
356fdfbe AK |
320 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_EVT_SHIFT, 4, 0), |
321 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_BBM_SHIFT, 4, 0), | |
322 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_TTL_SHIFT, 4, 0), | |
e48d53a9 | 323 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_FWB_SHIFT, 4, 0), |
356fdfbe | 324 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_IDS_SHIFT, 4, 0), |
7206dc93 | 325 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_AT_SHIFT, 4, 0), |
356fdfbe AK |
326 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_ST_SHIFT, 4, 0), |
327 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_NV_SHIFT, 4, 0), | |
328 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_CCIDX_SHIFT, 4, 0), | |
5bdecb79 | 329 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_LVA_SHIFT, 4, 0), |
9d3f8881 | 330 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_IESB_SHIFT, 4, 0), |
5bdecb79 SP |
331 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_LSM_SHIFT, 4, 0), |
332 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_UAO_SHIFT, 4, 0), | |
333 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_CNP_SHIFT, 4, 0), | |
406e3087 JM |
334 | ARM64_FTR_END, |
335 | }; | |
336 | ||
5e49d73c | 337 | static const struct arm64_ftr_bits ftr_ctr[] = { |
6ae4b6e0 SD |
338 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_EXACT, 31, 1, 1), /* RES1 */ |
339 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, CTR_DIC_SHIFT, 1, 1), | |
340 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, CTR_IDC_SHIFT, 1, 1), | |
147b9635 WD |
341 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_HIGHER_OR_ZERO_SAFE, CTR_CWG_SHIFT, 4, 0), |
342 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_HIGHER_OR_ZERO_SAFE, CTR_ERG_SHIFT, 4, 0), | |
6ae4b6e0 | 343 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, CTR_DMINLINE_SHIFT, 4, 1), |
3c739b57 SP |
344 | /* |
345 | * Linux can handle differing I-cache policies. Userspace JITs will | |
ee7bc638 | 346 | * make use of *minLine. |
155433cb | 347 | * If we have differing I-cache policies, report it as the weakest - VIPT. |
3c739b57 | 348 | */ |
8d3154af | 349 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_NONSTRICT, FTR_EXACT, CTR_L1IP_SHIFT, 2, ICACHE_POLICY_VIPT), /* L1Ip */ |
4c4a39dd | 350 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, CTR_IMINLINE_SHIFT, 4, 0), |
3c739b57 SP |
351 | ARM64_FTR_END, |
352 | }; | |
353 | ||
675b0563 AB |
354 | struct arm64_ftr_reg arm64_ftr_reg_ctrel0 = { |
355 | .name = "SYS_CTR_EL0", | |
356 | .ftr_bits = ftr_ctr | |
357 | }; | |
358 | ||
5e49d73c | 359 | static const struct arm64_ftr_bits ftr_id_mmfr0[] = { |
8d3154af AK |
360 | S_ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR0_INNERSHR_SHIFT, 4, 0xf), |
361 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR0_FCSE_SHIFT, 4, 0), | |
362 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_MMFR0_AUXREG_SHIFT, 4, 0), | |
363 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR0_TCM_SHIFT, 4, 0), | |
364 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR0_SHARELVL_SHIFT, 4, 0), | |
365 | S_ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR0_OUTERSHR_SHIFT, 4, 0xf), | |
366 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR0_PMSA_SHIFT, 4, 0), | |
367 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR0_VMSA_SHIFT, 4, 0), | |
3c739b57 SP |
368 | ARM64_FTR_END, |
369 | }; | |
370 | ||
5e49d73c | 371 | static const struct arm64_ftr_bits ftr_id_aa64dfr0[] = { |
8d3154af | 372 | S_ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64DFR0_DOUBLELOCK_SHIFT, 4, 0), |
fe4fbdbc SP |
373 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64DFR0_PMSVER_SHIFT, 4, 0), |
374 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64DFR0_CTX_CMPS_SHIFT, 4, 0), | |
375 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64DFR0_WRPS_SHIFT, 4, 0), | |
376 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64DFR0_BRPS_SHIFT, 4, 0), | |
b20d1ba3 WD |
377 | /* |
378 | * We can instantiate multiple PMU instances with different levels | |
379 | * of support. | |
fe4fbdbc SP |
380 | */ |
381 | S_ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_EXACT, ID_AA64DFR0_PMUVER_SHIFT, 4, 0), | |
382 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_EXACT, ID_AA64DFR0_TRACEVER_SHIFT, 4, 0), | |
383 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_EXACT, ID_AA64DFR0_DEBUGVER_SHIFT, 4, 0x6), | |
3c739b57 SP |
384 | ARM64_FTR_END, |
385 | }; | |
386 | ||
5e49d73c | 387 | static const struct arm64_ftr_bits ftr_mvfr2[] = { |
8d3154af AK |
388 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, MVFR2_FPMISC_SHIFT, 4, 0), |
389 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, MVFR2_SIMDMISC_SHIFT, 4, 0), | |
3c739b57 SP |
390 | ARM64_FTR_END, |
391 | }; | |
392 | ||
5e49d73c | 393 | static const struct arm64_ftr_bits ftr_dczid[] = { |
8d3154af AK |
394 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_EXACT, DCZID_DZP_SHIFT, 1, 1), |
395 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, DCZID_BS_SHIFT, 4, 0), | |
3c739b57 SP |
396 | ARM64_FTR_END, |
397 | }; | |
398 | ||
2a5bc6c4 AK |
399 | static const struct arm64_ftr_bits ftr_id_isar0[] = { |
400 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR0_DIVIDE_SHIFT, 4, 0), | |
401 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR0_DEBUG_SHIFT, 4, 0), | |
402 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR0_COPROC_SHIFT, 4, 0), | |
403 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR0_CMPBRANCH_SHIFT, 4, 0), | |
404 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR0_BITFIELD_SHIFT, 4, 0), | |
405 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR0_BITCOUNT_SHIFT, 4, 0), | |
406 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR0_SWAP_SHIFT, 4, 0), | |
407 | ARM64_FTR_END, | |
408 | }; | |
3c739b57 | 409 | |
5e49d73c | 410 | static const struct arm64_ftr_bits ftr_id_isar5[] = { |
5bdecb79 SP |
411 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR5_RDM_SHIFT, 4, 0), |
412 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR5_CRC32_SHIFT, 4, 0), | |
413 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR5_SHA2_SHIFT, 4, 0), | |
414 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR5_SHA1_SHIFT, 4, 0), | |
415 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR5_AES_SHIFT, 4, 0), | |
416 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR5_SEVL_SHIFT, 4, 0), | |
3c739b57 SP |
417 | ARM64_FTR_END, |
418 | }; | |
419 | ||
5e49d73c | 420 | static const struct arm64_ftr_bits ftr_id_mmfr4[] = { |
fcd65353 AK |
421 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR4_EVT_SHIFT, 4, 0), |
422 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR4_CCIDX_SHIFT, 4, 0), | |
423 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR4_LSM_SHIFT, 4, 0), | |
424 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR4_HPDS_SHIFT, 4, 0), | |
425 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR4_CNP_SHIFT, 4, 0), | |
426 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR4_XNX_SHIFT, 4, 0), | |
8d3154af AK |
427 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR4_AC2_SHIFT, 4, 0), |
428 | ||
fcd65353 AK |
429 | /* |
430 | * SpecSEI = 1 indicates that the PE might generate an SError on an | |
431 | * external abort on speculative read. It is safe to assume that an | |
432 | * SError might be generated than it will not be. Hence it has been | |
433 | * classified as FTR_HIGHER_SAFE. | |
434 | */ | |
435 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_HIGHER_SAFE, ID_MMFR4_SPECSEI_SHIFT, 4, 0), | |
3c739b57 SP |
436 | ARM64_FTR_END, |
437 | }; | |
438 | ||
0113340e WD |
439 | static const struct arm64_ftr_bits ftr_id_isar4[] = { |
440 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR4_SWP_FRAC_SHIFT, 4, 0), | |
441 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR4_PSR_M_SHIFT, 4, 0), | |
442 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR4_SYNCH_PRIM_FRAC_SHIFT, 4, 0), | |
443 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR4_BARRIER_SHIFT, 4, 0), | |
444 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR4_SMC_SHIFT, 4, 0), | |
445 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR4_WRITEBACK_SHIFT, 4, 0), | |
446 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR4_WITHSHIFTS_SHIFT, 4, 0), | |
447 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR4_UNPRIV_SHIFT, 4, 0), | |
448 | ARM64_FTR_END, | |
449 | }; | |
450 | ||
152accf8 AK |
451 | static const struct arm64_ftr_bits ftr_id_mmfr5[] = { |
452 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR5_ETS_SHIFT, 4, 0), | |
453 | ARM64_FTR_END, | |
454 | }; | |
455 | ||
8e3747be AK |
456 | static const struct arm64_ftr_bits ftr_id_isar6[] = { |
457 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR6_I8MM_SHIFT, 4, 0), | |
458 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR6_BF16_SHIFT, 4, 0), | |
459 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR6_SPECRES_SHIFT, 4, 0), | |
460 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR6_SB_SHIFT, 4, 0), | |
461 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR6_FHM_SHIFT, 4, 0), | |
462 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR6_DP_SHIFT, 4, 0), | |
463 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR6_JSCVT_SHIFT, 4, 0), | |
464 | ARM64_FTR_END, | |
465 | }; | |
466 | ||
5e49d73c | 467 | static const struct arm64_ftr_bits ftr_id_pfr0[] = { |
0ae43a99 AK |
468 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR0_DIT_SHIFT, 4, 0), |
469 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_PFR0_CSV2_SHIFT, 4, 0), | |
8d3154af AK |
470 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR0_STATE3_SHIFT, 4, 0), |
471 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR0_STATE2_SHIFT, 4, 0), | |
472 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR0_STATE1_SHIFT, 4, 0), | |
473 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR0_STATE0_SHIFT, 4, 0), | |
3c739b57 SP |
474 | ARM64_FTR_END, |
475 | }; | |
476 | ||
0113340e WD |
477 | static const struct arm64_ftr_bits ftr_id_pfr1[] = { |
478 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR1_GIC_SHIFT, 4, 0), | |
479 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR1_VIRT_FRAC_SHIFT, 4, 0), | |
480 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR1_SEC_FRAC_SHIFT, 4, 0), | |
481 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR1_GENTIMER_SHIFT, 4, 0), | |
482 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR1_VIRTUALIZATION_SHIFT, 4, 0), | |
483 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR1_MPROGMOD_SHIFT, 4, 0), | |
484 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR1_SECURITY_SHIFT, 4, 0), | |
485 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR1_PROGMOD_SHIFT, 4, 0), | |
486 | ARM64_FTR_END, | |
487 | }; | |
488 | ||
16824085 AK |
489 | static const struct arm64_ftr_bits ftr_id_pfr2[] = { |
490 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR2_SSBS_SHIFT, 4, 0), | |
491 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_PFR2_CSV3_SHIFT, 4, 0), | |
492 | ARM64_FTR_END, | |
493 | }; | |
494 | ||
5e49d73c | 495 | static const struct arm64_ftr_bits ftr_id_dfr0[] = { |
1ed1b90a | 496 | /* [31:28] TraceFilt */ |
8d3154af AK |
497 | S_ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_DFR0_PERFMON_SHIFT, 4, 0xf), |
498 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_DFR0_MPROFDBG_SHIFT, 4, 0), | |
499 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_DFR0_MMAPTRC_SHIFT, 4, 0), | |
500 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_DFR0_COPTRC_SHIFT, 4, 0), | |
501 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_DFR0_MMAPDBG_SHIFT, 4, 0), | |
502 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_DFR0_COPSDBG_SHIFT, 4, 0), | |
503 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_DFR0_COPDBG_SHIFT, 4, 0), | |
e5343503 SP |
504 | ARM64_FTR_END, |
505 | }; | |
506 | ||
dd35ec07 AK |
507 | static const struct arm64_ftr_bits ftr_id_dfr1[] = { |
508 | S_ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_DFR1_MTPMU_SHIFT, 4, 0), | |
509 | ARM64_FTR_END, | |
510 | }; | |
511 | ||
2e0f2478 DM |
512 | static const struct arm64_ftr_bits ftr_zcr[] = { |
513 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, | |
514 | ZCR_ELx_LEN_SHIFT, ZCR_ELx_LEN_SIZE, 0), /* LEN */ | |
515 | ARM64_FTR_END, | |
516 | }; | |
517 | ||
3c739b57 SP |
518 | /* |
519 | * Common ftr bits for a 32bit register with all hidden, strict | |
520 | * attributes, with 4bit feature fields and a default safe value of | |
521 | * 0. Covers the following 32bit registers: | |
2a5bc6c4 | 522 | * id_isar[1-4], id_mmfr[1-3], id_pfr1, mvfr[0-1] |
3c739b57 | 523 | */ |
5e49d73c | 524 | static const struct arm64_ftr_bits ftr_generic_32bits[] = { |
fe4fbdbc SP |
525 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 28, 4, 0), |
526 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 24, 4, 0), | |
527 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 20, 4, 0), | |
528 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 16, 4, 0), | |
529 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 12, 4, 0), | |
530 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 8, 4, 0), | |
531 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 4, 4, 0), | |
532 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 0, 4, 0), | |
3c739b57 SP |
533 | ARM64_FTR_END, |
534 | }; | |
535 | ||
eab43e88 SP |
536 | /* Table for a single 32bit feature value */ |
537 | static const struct arm64_ftr_bits ftr_single32[] = { | |
fe4fbdbc | 538 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_EXACT, 0, 32, 0), |
3c739b57 SP |
539 | ARM64_FTR_END, |
540 | }; | |
541 | ||
eab43e88 | 542 | static const struct arm64_ftr_bits ftr_raz[] = { |
3c739b57 SP |
543 | ARM64_FTR_END, |
544 | }; | |
545 | ||
6f2b7eef AB |
546 | #define ARM64_FTR_REG(id, table) { \ |
547 | .sys_id = id, \ | |
548 | .reg = &(struct arm64_ftr_reg){ \ | |
3c739b57 SP |
549 | .name = #id, \ |
550 | .ftr_bits = &((table)[0]), \ | |
6f2b7eef | 551 | }} |
3c739b57 | 552 | |
6f2b7eef AB |
553 | static const struct __ftr_reg_entry { |
554 | u32 sys_id; | |
555 | struct arm64_ftr_reg *reg; | |
556 | } arm64_ftr_regs[] = { | |
3c739b57 SP |
557 | |
558 | /* Op1 = 0, CRn = 0, CRm = 1 */ | |
559 | ARM64_FTR_REG(SYS_ID_PFR0_EL1, ftr_id_pfr0), | |
0113340e | 560 | ARM64_FTR_REG(SYS_ID_PFR1_EL1, ftr_id_pfr1), |
e5343503 | 561 | ARM64_FTR_REG(SYS_ID_DFR0_EL1, ftr_id_dfr0), |
3c739b57 SP |
562 | ARM64_FTR_REG(SYS_ID_MMFR0_EL1, ftr_id_mmfr0), |
563 | ARM64_FTR_REG(SYS_ID_MMFR1_EL1, ftr_generic_32bits), | |
564 | ARM64_FTR_REG(SYS_ID_MMFR2_EL1, ftr_generic_32bits), | |
565 | ARM64_FTR_REG(SYS_ID_MMFR3_EL1, ftr_generic_32bits), | |
566 | ||
567 | /* Op1 = 0, CRn = 0, CRm = 2 */ | |
2a5bc6c4 | 568 | ARM64_FTR_REG(SYS_ID_ISAR0_EL1, ftr_id_isar0), |
3c739b57 SP |
569 | ARM64_FTR_REG(SYS_ID_ISAR1_EL1, ftr_generic_32bits), |
570 | ARM64_FTR_REG(SYS_ID_ISAR2_EL1, ftr_generic_32bits), | |
571 | ARM64_FTR_REG(SYS_ID_ISAR3_EL1, ftr_generic_32bits), | |
0113340e | 572 | ARM64_FTR_REG(SYS_ID_ISAR4_EL1, ftr_id_isar4), |
3c739b57 SP |
573 | ARM64_FTR_REG(SYS_ID_ISAR5_EL1, ftr_id_isar5), |
574 | ARM64_FTR_REG(SYS_ID_MMFR4_EL1, ftr_id_mmfr4), | |
8e3747be | 575 | ARM64_FTR_REG(SYS_ID_ISAR6_EL1, ftr_id_isar6), |
3c739b57 SP |
576 | |
577 | /* Op1 = 0, CRn = 0, CRm = 3 */ | |
578 | ARM64_FTR_REG(SYS_MVFR0_EL1, ftr_generic_32bits), | |
579 | ARM64_FTR_REG(SYS_MVFR1_EL1, ftr_generic_32bits), | |
580 | ARM64_FTR_REG(SYS_MVFR2_EL1, ftr_mvfr2), | |
16824085 | 581 | ARM64_FTR_REG(SYS_ID_PFR2_EL1, ftr_id_pfr2), |
dd35ec07 | 582 | ARM64_FTR_REG(SYS_ID_DFR1_EL1, ftr_id_dfr1), |
152accf8 | 583 | ARM64_FTR_REG(SYS_ID_MMFR5_EL1, ftr_id_mmfr5), |
3c739b57 SP |
584 | |
585 | /* Op1 = 0, CRn = 0, CRm = 4 */ | |
586 | ARM64_FTR_REG(SYS_ID_AA64PFR0_EL1, ftr_id_aa64pfr0), | |
d71be2b6 | 587 | ARM64_FTR_REG(SYS_ID_AA64PFR1_EL1, ftr_id_aa64pfr1), |
06a916fe | 588 | ARM64_FTR_REG(SYS_ID_AA64ZFR0_EL1, ftr_id_aa64zfr0), |
3c739b57 SP |
589 | |
590 | /* Op1 = 0, CRn = 0, CRm = 5 */ | |
591 | ARM64_FTR_REG(SYS_ID_AA64DFR0_EL1, ftr_id_aa64dfr0), | |
eab43e88 | 592 | ARM64_FTR_REG(SYS_ID_AA64DFR1_EL1, ftr_raz), |
3c739b57 SP |
593 | |
594 | /* Op1 = 0, CRn = 0, CRm = 6 */ | |
595 | ARM64_FTR_REG(SYS_ID_AA64ISAR0_EL1, ftr_id_aa64isar0), | |
c8c3798d | 596 | ARM64_FTR_REG(SYS_ID_AA64ISAR1_EL1, ftr_id_aa64isar1), |
3c739b57 SP |
597 | |
598 | /* Op1 = 0, CRn = 0, CRm = 7 */ | |
599 | ARM64_FTR_REG(SYS_ID_AA64MMFR0_EL1, ftr_id_aa64mmfr0), | |
600 | ARM64_FTR_REG(SYS_ID_AA64MMFR1_EL1, ftr_id_aa64mmfr1), | |
406e3087 | 601 | ARM64_FTR_REG(SYS_ID_AA64MMFR2_EL1, ftr_id_aa64mmfr2), |
3c739b57 | 602 | |
2e0f2478 DM |
603 | /* Op1 = 0, CRn = 1, CRm = 2 */ |
604 | ARM64_FTR_REG(SYS_ZCR_EL1, ftr_zcr), | |
605 | ||
3c739b57 | 606 | /* Op1 = 3, CRn = 0, CRm = 0 */ |
675b0563 | 607 | { SYS_CTR_EL0, &arm64_ftr_reg_ctrel0 }, |
3c739b57 SP |
608 | ARM64_FTR_REG(SYS_DCZID_EL0, ftr_dczid), |
609 | ||
610 | /* Op1 = 3, CRn = 14, CRm = 0 */ | |
eab43e88 | 611 | ARM64_FTR_REG(SYS_CNTFRQ_EL0, ftr_single32), |
3c739b57 SP |
612 | }; |
613 | ||
614 | static int search_cmp_ftr_reg(const void *id, const void *regp) | |
615 | { | |
6f2b7eef | 616 | return (int)(unsigned long)id - (int)((const struct __ftr_reg_entry *)regp)->sys_id; |
3c739b57 SP |
617 | } |
618 | ||
619 | /* | |
3577dd37 AK |
620 | * get_arm64_ftr_reg_nowarn - Looks up a feature register entry using |
621 | * its sys_reg() encoding. With the array arm64_ftr_regs sorted in the | |
622 | * ascending order of sys_id, we use binary search to find a matching | |
3c739b57 SP |
623 | * entry. |
624 | * | |
625 | * returns - Upon success, matching ftr_reg entry for id. | |
626 | * - NULL on failure. It is upto the caller to decide | |
627 | * the impact of a failure. | |
628 | */ | |
3577dd37 | 629 | static struct arm64_ftr_reg *get_arm64_ftr_reg_nowarn(u32 sys_id) |
3c739b57 | 630 | { |
6f2b7eef AB |
631 | const struct __ftr_reg_entry *ret; |
632 | ||
633 | ret = bsearch((const void *)(unsigned long)sys_id, | |
3c739b57 SP |
634 | arm64_ftr_regs, |
635 | ARRAY_SIZE(arm64_ftr_regs), | |
636 | sizeof(arm64_ftr_regs[0]), | |
637 | search_cmp_ftr_reg); | |
6f2b7eef AB |
638 | if (ret) |
639 | return ret->reg; | |
640 | return NULL; | |
3c739b57 SP |
641 | } |
642 | ||
3577dd37 AK |
643 | /* |
644 | * get_arm64_ftr_reg - Looks up a feature register entry using | |
645 | * its sys_reg() encoding. This calls get_arm64_ftr_reg_nowarn(). | |
646 | * | |
647 | * returns - Upon success, matching ftr_reg entry for id. | |
648 | * - NULL on failure but with an WARN_ON(). | |
649 | */ | |
650 | static struct arm64_ftr_reg *get_arm64_ftr_reg(u32 sys_id) | |
651 | { | |
652 | struct arm64_ftr_reg *reg; | |
653 | ||
654 | reg = get_arm64_ftr_reg_nowarn(sys_id); | |
655 | ||
656 | /* | |
657 | * Requesting a non-existent register search is an error. Warn | |
658 | * and let the caller handle it. | |
659 | */ | |
660 | WARN_ON(!reg); | |
661 | return reg; | |
662 | } | |
663 | ||
5e49d73c AB |
664 | static u64 arm64_ftr_set_value(const struct arm64_ftr_bits *ftrp, s64 reg, |
665 | s64 ftr_val) | |
3c739b57 SP |
666 | { |
667 | u64 mask = arm64_ftr_mask(ftrp); | |
668 | ||
669 | reg &= ~mask; | |
670 | reg |= (ftr_val << ftrp->shift) & mask; | |
671 | return reg; | |
672 | } | |
673 | ||
5e49d73c AB |
674 | static s64 arm64_ftr_safe_value(const struct arm64_ftr_bits *ftrp, s64 new, |
675 | s64 cur) | |
3c739b57 SP |
676 | { |
677 | s64 ret = 0; | |
678 | ||
679 | switch (ftrp->type) { | |
680 | case FTR_EXACT: | |
681 | ret = ftrp->safe_val; | |
682 | break; | |
683 | case FTR_LOWER_SAFE: | |
684 | ret = new < cur ? new : cur; | |
685 | break; | |
147b9635 WD |
686 | case FTR_HIGHER_OR_ZERO_SAFE: |
687 | if (!cur || !new) | |
688 | break; | |
df561f66 | 689 | fallthrough; |
3c739b57 SP |
690 | case FTR_HIGHER_SAFE: |
691 | ret = new > cur ? new : cur; | |
692 | break; | |
693 | default: | |
694 | BUG(); | |
695 | } | |
696 | ||
697 | return ret; | |
698 | } | |
699 | ||
3c739b57 SP |
700 | static void __init sort_ftr_regs(void) |
701 | { | |
c6c83d75 AK |
702 | unsigned int i; |
703 | ||
704 | for (i = 0; i < ARRAY_SIZE(arm64_ftr_regs); i++) { | |
705 | const struct arm64_ftr_reg *ftr_reg = arm64_ftr_regs[i].reg; | |
706 | const struct arm64_ftr_bits *ftr_bits = ftr_reg->ftr_bits; | |
707 | unsigned int j = 0; | |
708 | ||
709 | /* | |
710 | * Features here must be sorted in descending order with respect | |
711 | * to their shift values and should not overlap with each other. | |
712 | */ | |
713 | for (; ftr_bits->width != 0; ftr_bits++, j++) { | |
714 | unsigned int width = ftr_reg->ftr_bits[j].width; | |
715 | unsigned int shift = ftr_reg->ftr_bits[j].shift; | |
716 | unsigned int prev_shift; | |
717 | ||
718 | WARN((shift + width) > 64, | |
719 | "%s has invalid feature at shift %d\n", | |
720 | ftr_reg->name, shift); | |
721 | ||
722 | /* | |
723 | * Skip the first feature. There is nothing to | |
724 | * compare against for now. | |
725 | */ | |
726 | if (j == 0) | |
727 | continue; | |
728 | ||
729 | prev_shift = ftr_reg->ftr_bits[j - 1].shift; | |
730 | WARN((shift + width) > prev_shift, | |
731 | "%s has feature overlap at shift %d\n", | |
732 | ftr_reg->name, shift); | |
733 | } | |
6f2b7eef | 734 | |
c6c83d75 AK |
735 | /* |
736 | * Skip the first register. There is nothing to | |
737 | * compare against for now. | |
738 | */ | |
739 | if (i == 0) | |
740 | continue; | |
741 | /* | |
742 | * Registers here must be sorted in ascending order with respect | |
743 | * to sys_id for subsequent binary search in get_arm64_ftr_reg() | |
744 | * to work correctly. | |
745 | */ | |
6f2b7eef | 746 | BUG_ON(arm64_ftr_regs[i].sys_id < arm64_ftr_regs[i - 1].sys_id); |
c6c83d75 | 747 | } |
3c739b57 SP |
748 | } |
749 | ||
750 | /* | |
751 | * Initialise the CPU feature register from Boot CPU values. | |
752 | * Also initiliases the strict_mask for the register. | |
b389d799 MR |
753 | * Any bits that are not covered by an arm64_ftr_bits entry are considered |
754 | * RES0 for the system-wide value, and must strictly match. | |
3c739b57 SP |
755 | */ |
756 | static void __init init_cpu_ftr_reg(u32 sys_reg, u64 new) | |
757 | { | |
758 | u64 val = 0; | |
759 | u64 strict_mask = ~0x0ULL; | |
fe4fbdbc | 760 | u64 user_mask = 0; |
b389d799 MR |
761 | u64 valid_mask = 0; |
762 | ||
5e49d73c | 763 | const struct arm64_ftr_bits *ftrp; |
3c739b57 SP |
764 | struct arm64_ftr_reg *reg = get_arm64_ftr_reg(sys_reg); |
765 | ||
3577dd37 AK |
766 | if (!reg) |
767 | return; | |
3c739b57 | 768 | |
24b2cce9 | 769 | for (ftrp = reg->ftr_bits; ftrp->width; ftrp++) { |
b389d799 | 770 | u64 ftr_mask = arm64_ftr_mask(ftrp); |
3c739b57 SP |
771 | s64 ftr_new = arm64_ftr_value(ftrp, new); |
772 | ||
773 | val = arm64_ftr_set_value(ftrp, val, ftr_new); | |
b389d799 MR |
774 | |
775 | valid_mask |= ftr_mask; | |
3c739b57 | 776 | if (!ftrp->strict) |
b389d799 | 777 | strict_mask &= ~ftr_mask; |
fe4fbdbc SP |
778 | if (ftrp->visible) |
779 | user_mask |= ftr_mask; | |
780 | else | |
781 | reg->user_val = arm64_ftr_set_value(ftrp, | |
782 | reg->user_val, | |
783 | ftrp->safe_val); | |
3c739b57 | 784 | } |
b389d799 MR |
785 | |
786 | val &= valid_mask; | |
787 | ||
3c739b57 SP |
788 | reg->sys_val = val; |
789 | reg->strict_mask = strict_mask; | |
fe4fbdbc | 790 | reg->user_mask = user_mask; |
3c739b57 SP |
791 | } |
792 | ||
1e89baed | 793 | extern const struct arm64_cpu_capabilities arm64_errata[]; |
82a3a21b SP |
794 | static const struct arm64_cpu_capabilities arm64_features[]; |
795 | ||
796 | static void __init | |
797 | init_cpu_hwcaps_indirect_list_from_array(const struct arm64_cpu_capabilities *caps) | |
798 | { | |
799 | for (; caps->matches; caps++) { | |
800 | if (WARN(caps->capability >= ARM64_NCAPS, | |
801 | "Invalid capability %d\n", caps->capability)) | |
802 | continue; | |
803 | if (WARN(cpu_hwcaps_ptrs[caps->capability], | |
804 | "Duplicate entry for capability %d\n", | |
805 | caps->capability)) | |
806 | continue; | |
807 | cpu_hwcaps_ptrs[caps->capability] = caps; | |
808 | } | |
809 | } | |
810 | ||
811 | static void __init init_cpu_hwcaps_indirect_list(void) | |
812 | { | |
813 | init_cpu_hwcaps_indirect_list_from_array(arm64_features); | |
814 | init_cpu_hwcaps_indirect_list_from_array(arm64_errata); | |
815 | } | |
816 | ||
fd9d63da | 817 | static void __init setup_boot_cpu_capabilities(void); |
1e89baed | 818 | |
3c739b57 SP |
819 | void __init init_cpu_features(struct cpuinfo_arm64 *info) |
820 | { | |
821 | /* Before we start using the tables, make sure it is sorted */ | |
822 | sort_ftr_regs(); | |
823 | ||
824 | init_cpu_ftr_reg(SYS_CTR_EL0, info->reg_ctr); | |
825 | init_cpu_ftr_reg(SYS_DCZID_EL0, info->reg_dczid); | |
826 | init_cpu_ftr_reg(SYS_CNTFRQ_EL0, info->reg_cntfrq); | |
827 | init_cpu_ftr_reg(SYS_ID_AA64DFR0_EL1, info->reg_id_aa64dfr0); | |
828 | init_cpu_ftr_reg(SYS_ID_AA64DFR1_EL1, info->reg_id_aa64dfr1); | |
829 | init_cpu_ftr_reg(SYS_ID_AA64ISAR0_EL1, info->reg_id_aa64isar0); | |
830 | init_cpu_ftr_reg(SYS_ID_AA64ISAR1_EL1, info->reg_id_aa64isar1); | |
831 | init_cpu_ftr_reg(SYS_ID_AA64MMFR0_EL1, info->reg_id_aa64mmfr0); | |
832 | init_cpu_ftr_reg(SYS_ID_AA64MMFR1_EL1, info->reg_id_aa64mmfr1); | |
406e3087 | 833 | init_cpu_ftr_reg(SYS_ID_AA64MMFR2_EL1, info->reg_id_aa64mmfr2); |
3c739b57 SP |
834 | init_cpu_ftr_reg(SYS_ID_AA64PFR0_EL1, info->reg_id_aa64pfr0); |
835 | init_cpu_ftr_reg(SYS_ID_AA64PFR1_EL1, info->reg_id_aa64pfr1); | |
2e0f2478 | 836 | init_cpu_ftr_reg(SYS_ID_AA64ZFR0_EL1, info->reg_id_aa64zfr0); |
a6dc3cd7 SP |
837 | |
838 | if (id_aa64pfr0_32bit_el0(info->reg_id_aa64pfr0)) { | |
839 | init_cpu_ftr_reg(SYS_ID_DFR0_EL1, info->reg_id_dfr0); | |
dd35ec07 | 840 | init_cpu_ftr_reg(SYS_ID_DFR1_EL1, info->reg_id_dfr1); |
a6dc3cd7 SP |
841 | init_cpu_ftr_reg(SYS_ID_ISAR0_EL1, info->reg_id_isar0); |
842 | init_cpu_ftr_reg(SYS_ID_ISAR1_EL1, info->reg_id_isar1); | |
843 | init_cpu_ftr_reg(SYS_ID_ISAR2_EL1, info->reg_id_isar2); | |
844 | init_cpu_ftr_reg(SYS_ID_ISAR3_EL1, info->reg_id_isar3); | |
845 | init_cpu_ftr_reg(SYS_ID_ISAR4_EL1, info->reg_id_isar4); | |
846 | init_cpu_ftr_reg(SYS_ID_ISAR5_EL1, info->reg_id_isar5); | |
8e3747be | 847 | init_cpu_ftr_reg(SYS_ID_ISAR6_EL1, info->reg_id_isar6); |
a6dc3cd7 SP |
848 | init_cpu_ftr_reg(SYS_ID_MMFR0_EL1, info->reg_id_mmfr0); |
849 | init_cpu_ftr_reg(SYS_ID_MMFR1_EL1, info->reg_id_mmfr1); | |
850 | init_cpu_ftr_reg(SYS_ID_MMFR2_EL1, info->reg_id_mmfr2); | |
851 | init_cpu_ftr_reg(SYS_ID_MMFR3_EL1, info->reg_id_mmfr3); | |
858b8a80 | 852 | init_cpu_ftr_reg(SYS_ID_MMFR4_EL1, info->reg_id_mmfr4); |
152accf8 | 853 | init_cpu_ftr_reg(SYS_ID_MMFR5_EL1, info->reg_id_mmfr5); |
a6dc3cd7 SP |
854 | init_cpu_ftr_reg(SYS_ID_PFR0_EL1, info->reg_id_pfr0); |
855 | init_cpu_ftr_reg(SYS_ID_PFR1_EL1, info->reg_id_pfr1); | |
16824085 | 856 | init_cpu_ftr_reg(SYS_ID_PFR2_EL1, info->reg_id_pfr2); |
a6dc3cd7 SP |
857 | init_cpu_ftr_reg(SYS_MVFR0_EL1, info->reg_mvfr0); |
858 | init_cpu_ftr_reg(SYS_MVFR1_EL1, info->reg_mvfr1); | |
859 | init_cpu_ftr_reg(SYS_MVFR2_EL1, info->reg_mvfr2); | |
860 | } | |
861 | ||
2e0f2478 DM |
862 | if (id_aa64pfr0_sve(info->reg_id_aa64pfr0)) { |
863 | init_cpu_ftr_reg(SYS_ZCR_EL1, info->reg_zcr); | |
864 | sve_init_vq_map(); | |
865 | } | |
5e91107b | 866 | |
82a3a21b SP |
867 | /* |
868 | * Initialize the indirect array of CPU hwcaps capabilities pointers | |
869 | * before we handle the boot CPU below. | |
870 | */ | |
871 | init_cpu_hwcaps_indirect_list(); | |
872 | ||
5e91107b | 873 | /* |
fd9d63da SP |
874 | * Detect and enable early CPU capabilities based on the boot CPU, |
875 | * after we have initialised the CPU feature infrastructure. | |
5e91107b | 876 | */ |
fd9d63da | 877 | setup_boot_cpu_capabilities(); |
3c739b57 SP |
878 | } |
879 | ||
3086d391 | 880 | static void update_cpu_ftr_reg(struct arm64_ftr_reg *reg, u64 new) |
3c739b57 | 881 | { |
5e49d73c | 882 | const struct arm64_ftr_bits *ftrp; |
3c739b57 SP |
883 | |
884 | for (ftrp = reg->ftr_bits; ftrp->width; ftrp++) { | |
885 | s64 ftr_cur = arm64_ftr_value(ftrp, reg->sys_val); | |
886 | s64 ftr_new = arm64_ftr_value(ftrp, new); | |
887 | ||
888 | if (ftr_cur == ftr_new) | |
889 | continue; | |
890 | /* Find a safe value */ | |
891 | ftr_new = arm64_ftr_safe_value(ftrp, ftr_new, ftr_cur); | |
892 | reg->sys_val = arm64_ftr_set_value(ftrp, reg->sys_val, ftr_new); | |
893 | } | |
894 | ||
895 | } | |
896 | ||
3086d391 | 897 | static int check_update_ftr_reg(u32 sys_id, int cpu, u64 val, u64 boot) |
cdcf817b | 898 | { |
3086d391 SP |
899 | struct arm64_ftr_reg *regp = get_arm64_ftr_reg(sys_id); |
900 | ||
3577dd37 AK |
901 | if (!regp) |
902 | return 0; | |
903 | ||
3086d391 SP |
904 | update_cpu_ftr_reg(regp, val); |
905 | if ((boot & regp->strict_mask) == (val & regp->strict_mask)) | |
906 | return 0; | |
907 | pr_warn("SANITY CHECK: Unexpected variation in %s. Boot CPU: %#016llx, CPU%d: %#016llx\n", | |
908 | regp->name, boot, cpu, val); | |
909 | return 1; | |
910 | } | |
911 | ||
eab2f926 WD |
912 | static void relax_cpu_ftr_reg(u32 sys_id, int field) |
913 | { | |
914 | const struct arm64_ftr_bits *ftrp; | |
915 | struct arm64_ftr_reg *regp = get_arm64_ftr_reg(sys_id); | |
916 | ||
3577dd37 | 917 | if (!regp) |
eab2f926 WD |
918 | return; |
919 | ||
920 | for (ftrp = regp->ftr_bits; ftrp->width; ftrp++) { | |
921 | if (ftrp->shift == field) { | |
922 | regp->strict_mask &= ~arm64_ftr_mask(ftrp); | |
923 | break; | |
924 | } | |
925 | } | |
926 | ||
927 | /* Bogus field? */ | |
928 | WARN_ON(!ftrp->width); | |
929 | } | |
930 | ||
1efcfe79 WD |
931 | static int update_32bit_cpu_features(int cpu, struct cpuinfo_arm64 *info, |
932 | struct cpuinfo_arm64 *boot) | |
933 | { | |
934 | int taint = 0; | |
935 | u64 pfr0 = read_sanitised_ftr_reg(SYS_ID_AA64PFR0_EL1); | |
936 | ||
937 | /* | |
938 | * If we don't have AArch32 at all then skip the checks entirely | |
939 | * as the register values may be UNKNOWN and we're not going to be | |
940 | * using them for anything. | |
941 | */ | |
942 | if (!id_aa64pfr0_32bit_el0(pfr0)) | |
943 | return taint; | |
944 | ||
eab2f926 WD |
945 | /* |
946 | * If we don't have AArch32 at EL1, then relax the strictness of | |
947 | * EL1-dependent register fields to avoid spurious sanity check fails. | |
948 | */ | |
949 | if (!id_aa64pfr0_32bit_el1(pfr0)) { | |
950 | relax_cpu_ftr_reg(SYS_ID_ISAR4_EL1, ID_ISAR4_SMC_SHIFT); | |
951 | relax_cpu_ftr_reg(SYS_ID_PFR1_EL1, ID_PFR1_VIRT_FRAC_SHIFT); | |
952 | relax_cpu_ftr_reg(SYS_ID_PFR1_EL1, ID_PFR1_SEC_FRAC_SHIFT); | |
953 | relax_cpu_ftr_reg(SYS_ID_PFR1_EL1, ID_PFR1_VIRTUALIZATION_SHIFT); | |
954 | relax_cpu_ftr_reg(SYS_ID_PFR1_EL1, ID_PFR1_SECURITY_SHIFT); | |
955 | relax_cpu_ftr_reg(SYS_ID_PFR1_EL1, ID_PFR1_PROGMOD_SHIFT); | |
956 | } | |
957 | ||
1efcfe79 WD |
958 | taint |= check_update_ftr_reg(SYS_ID_DFR0_EL1, cpu, |
959 | info->reg_id_dfr0, boot->reg_id_dfr0); | |
dd35ec07 AK |
960 | taint |= check_update_ftr_reg(SYS_ID_DFR1_EL1, cpu, |
961 | info->reg_id_dfr1, boot->reg_id_dfr1); | |
1efcfe79 WD |
962 | taint |= check_update_ftr_reg(SYS_ID_ISAR0_EL1, cpu, |
963 | info->reg_id_isar0, boot->reg_id_isar0); | |
964 | taint |= check_update_ftr_reg(SYS_ID_ISAR1_EL1, cpu, | |
965 | info->reg_id_isar1, boot->reg_id_isar1); | |
966 | taint |= check_update_ftr_reg(SYS_ID_ISAR2_EL1, cpu, | |
967 | info->reg_id_isar2, boot->reg_id_isar2); | |
968 | taint |= check_update_ftr_reg(SYS_ID_ISAR3_EL1, cpu, | |
969 | info->reg_id_isar3, boot->reg_id_isar3); | |
970 | taint |= check_update_ftr_reg(SYS_ID_ISAR4_EL1, cpu, | |
971 | info->reg_id_isar4, boot->reg_id_isar4); | |
972 | taint |= check_update_ftr_reg(SYS_ID_ISAR5_EL1, cpu, | |
973 | info->reg_id_isar5, boot->reg_id_isar5); | |
974 | taint |= check_update_ftr_reg(SYS_ID_ISAR6_EL1, cpu, | |
975 | info->reg_id_isar6, boot->reg_id_isar6); | |
976 | ||
977 | /* | |
978 | * Regardless of the value of the AuxReg field, the AIFSR, ADFSR, and | |
979 | * ACTLR formats could differ across CPUs and therefore would have to | |
980 | * be trapped for virtualization anyway. | |
981 | */ | |
982 | taint |= check_update_ftr_reg(SYS_ID_MMFR0_EL1, cpu, | |
983 | info->reg_id_mmfr0, boot->reg_id_mmfr0); | |
984 | taint |= check_update_ftr_reg(SYS_ID_MMFR1_EL1, cpu, | |
985 | info->reg_id_mmfr1, boot->reg_id_mmfr1); | |
986 | taint |= check_update_ftr_reg(SYS_ID_MMFR2_EL1, cpu, | |
987 | info->reg_id_mmfr2, boot->reg_id_mmfr2); | |
988 | taint |= check_update_ftr_reg(SYS_ID_MMFR3_EL1, cpu, | |
989 | info->reg_id_mmfr3, boot->reg_id_mmfr3); | |
858b8a80 AK |
990 | taint |= check_update_ftr_reg(SYS_ID_MMFR4_EL1, cpu, |
991 | info->reg_id_mmfr4, boot->reg_id_mmfr4); | |
152accf8 AK |
992 | taint |= check_update_ftr_reg(SYS_ID_MMFR5_EL1, cpu, |
993 | info->reg_id_mmfr5, boot->reg_id_mmfr5); | |
1efcfe79 WD |
994 | taint |= check_update_ftr_reg(SYS_ID_PFR0_EL1, cpu, |
995 | info->reg_id_pfr0, boot->reg_id_pfr0); | |
996 | taint |= check_update_ftr_reg(SYS_ID_PFR1_EL1, cpu, | |
997 | info->reg_id_pfr1, boot->reg_id_pfr1); | |
16824085 AK |
998 | taint |= check_update_ftr_reg(SYS_ID_PFR2_EL1, cpu, |
999 | info->reg_id_pfr2, boot->reg_id_pfr2); | |
1efcfe79 WD |
1000 | taint |= check_update_ftr_reg(SYS_MVFR0_EL1, cpu, |
1001 | info->reg_mvfr0, boot->reg_mvfr0); | |
1002 | taint |= check_update_ftr_reg(SYS_MVFR1_EL1, cpu, | |
1003 | info->reg_mvfr1, boot->reg_mvfr1); | |
1004 | taint |= check_update_ftr_reg(SYS_MVFR2_EL1, cpu, | |
1005 | info->reg_mvfr2, boot->reg_mvfr2); | |
1006 | ||
1007 | return taint; | |
1008 | } | |
1009 | ||
3086d391 SP |
1010 | /* |
1011 | * Update system wide CPU feature registers with the values from a | |
1012 | * non-boot CPU. Also performs SANITY checks to make sure that there | |
1013 | * aren't any insane variations from that of the boot CPU. | |
1014 | */ | |
1015 | void update_cpu_features(int cpu, | |
1016 | struct cpuinfo_arm64 *info, | |
1017 | struct cpuinfo_arm64 *boot) | |
1018 | { | |
1019 | int taint = 0; | |
1020 | ||
1021 | /* | |
1022 | * The kernel can handle differing I-cache policies, but otherwise | |
1023 | * caches should look identical. Userspace JITs will make use of | |
1024 | * *minLine. | |
1025 | */ | |
1026 | taint |= check_update_ftr_reg(SYS_CTR_EL0, cpu, | |
1027 | info->reg_ctr, boot->reg_ctr); | |
1028 | ||
1029 | /* | |
1030 | * Userspace may perform DC ZVA instructions. Mismatched block sizes | |
1031 | * could result in too much or too little memory being zeroed if a | |
1032 | * process is preempted and migrated between CPUs. | |
1033 | */ | |
1034 | taint |= check_update_ftr_reg(SYS_DCZID_EL0, cpu, | |
1035 | info->reg_dczid, boot->reg_dczid); | |
1036 | ||
1037 | /* If different, timekeeping will be broken (especially with KVM) */ | |
1038 | taint |= check_update_ftr_reg(SYS_CNTFRQ_EL0, cpu, | |
1039 | info->reg_cntfrq, boot->reg_cntfrq); | |
1040 | ||
1041 | /* | |
1042 | * The kernel uses self-hosted debug features and expects CPUs to | |
1043 | * support identical debug features. We presently need CTX_CMPs, WRPs, | |
1044 | * and BRPs to be identical. | |
1045 | * ID_AA64DFR1 is currently RES0. | |
1046 | */ | |
1047 | taint |= check_update_ftr_reg(SYS_ID_AA64DFR0_EL1, cpu, | |
1048 | info->reg_id_aa64dfr0, boot->reg_id_aa64dfr0); | |
1049 | taint |= check_update_ftr_reg(SYS_ID_AA64DFR1_EL1, cpu, | |
1050 | info->reg_id_aa64dfr1, boot->reg_id_aa64dfr1); | |
1051 | /* | |
1052 | * Even in big.LITTLE, processors should be identical instruction-set | |
1053 | * wise. | |
1054 | */ | |
1055 | taint |= check_update_ftr_reg(SYS_ID_AA64ISAR0_EL1, cpu, | |
1056 | info->reg_id_aa64isar0, boot->reg_id_aa64isar0); | |
1057 | taint |= check_update_ftr_reg(SYS_ID_AA64ISAR1_EL1, cpu, | |
1058 | info->reg_id_aa64isar1, boot->reg_id_aa64isar1); | |
1059 | ||
1060 | /* | |
1061 | * Differing PARange support is fine as long as all peripherals and | |
1062 | * memory are mapped within the minimum PARange of all CPUs. | |
1063 | * Linux should not care about secure memory. | |
1064 | */ | |
1065 | taint |= check_update_ftr_reg(SYS_ID_AA64MMFR0_EL1, cpu, | |
1066 | info->reg_id_aa64mmfr0, boot->reg_id_aa64mmfr0); | |
1067 | taint |= check_update_ftr_reg(SYS_ID_AA64MMFR1_EL1, cpu, | |
1068 | info->reg_id_aa64mmfr1, boot->reg_id_aa64mmfr1); | |
406e3087 JM |
1069 | taint |= check_update_ftr_reg(SYS_ID_AA64MMFR2_EL1, cpu, |
1070 | info->reg_id_aa64mmfr2, boot->reg_id_aa64mmfr2); | |
3086d391 | 1071 | |
3086d391 SP |
1072 | taint |= check_update_ftr_reg(SYS_ID_AA64PFR0_EL1, cpu, |
1073 | info->reg_id_aa64pfr0, boot->reg_id_aa64pfr0); | |
1074 | taint |= check_update_ftr_reg(SYS_ID_AA64PFR1_EL1, cpu, | |
1075 | info->reg_id_aa64pfr1, boot->reg_id_aa64pfr1); | |
1076 | ||
2e0f2478 DM |
1077 | taint |= check_update_ftr_reg(SYS_ID_AA64ZFR0_EL1, cpu, |
1078 | info->reg_id_aa64zfr0, boot->reg_id_aa64zfr0); | |
1079 | ||
2e0f2478 DM |
1080 | if (id_aa64pfr0_sve(info->reg_id_aa64pfr0)) { |
1081 | taint |= check_update_ftr_reg(SYS_ZCR_EL1, cpu, | |
1082 | info->reg_zcr, boot->reg_zcr); | |
1083 | ||
1084 | /* Probe vector lengths, unless we already gave up on SVE */ | |
1085 | if (id_aa64pfr0_sve(read_sanitised_ftr_reg(SYS_ID_AA64PFR0_EL1)) && | |
b51c6ac2 | 1086 | !system_capabilities_finalized()) |
2e0f2478 DM |
1087 | sve_update_vq_map(); |
1088 | } | |
1089 | ||
1efcfe79 WD |
1090 | /* |
1091 | * This relies on a sanitised view of the AArch64 ID registers | |
1092 | * (e.g. SYS_ID_AA64PFR0_EL1), so we call it last. | |
1093 | */ | |
1094 | taint |= update_32bit_cpu_features(cpu, info, boot); | |
1095 | ||
3086d391 SP |
1096 | /* |
1097 | * Mismatched CPU features are a recipe for disaster. Don't even | |
1098 | * pretend to support them. | |
1099 | */ | |
8dd0ee65 WD |
1100 | if (taint) { |
1101 | pr_warn_once("Unsupported CPU feature variation detected.\n"); | |
1102 | add_taint(TAINT_CPU_OUT_OF_SPEC, LOCKDEP_STILL_OK); | |
1103 | } | |
cdcf817b SP |
1104 | } |
1105 | ||
46823dd1 | 1106 | u64 read_sanitised_ftr_reg(u32 id) |
b3f15378 SP |
1107 | { |
1108 | struct arm64_ftr_reg *regp = get_arm64_ftr_reg(id); | |
1109 | ||
3577dd37 AK |
1110 | if (!regp) |
1111 | return 0; | |
b3f15378 SP |
1112 | return regp->sys_val; |
1113 | } | |
359b7064 | 1114 | |
965861d6 MR |
1115 | #define read_sysreg_case(r) \ |
1116 | case r: return read_sysreg_s(r) | |
1117 | ||
92406f0c | 1118 | /* |
46823dd1 | 1119 | * __read_sysreg_by_encoding() - Used by a STARTING cpu before cpuinfo is populated. |
92406f0c SP |
1120 | * Read the system register on the current CPU |
1121 | */ | |
46823dd1 | 1122 | static u64 __read_sysreg_by_encoding(u32 sys_id) |
92406f0c SP |
1123 | { |
1124 | switch (sys_id) { | |
965861d6 MR |
1125 | read_sysreg_case(SYS_ID_PFR0_EL1); |
1126 | read_sysreg_case(SYS_ID_PFR1_EL1); | |
16824085 | 1127 | read_sysreg_case(SYS_ID_PFR2_EL1); |
965861d6 | 1128 | read_sysreg_case(SYS_ID_DFR0_EL1); |
dd35ec07 | 1129 | read_sysreg_case(SYS_ID_DFR1_EL1); |
965861d6 MR |
1130 | read_sysreg_case(SYS_ID_MMFR0_EL1); |
1131 | read_sysreg_case(SYS_ID_MMFR1_EL1); | |
1132 | read_sysreg_case(SYS_ID_MMFR2_EL1); | |
1133 | read_sysreg_case(SYS_ID_MMFR3_EL1); | |
858b8a80 | 1134 | read_sysreg_case(SYS_ID_MMFR4_EL1); |
152accf8 | 1135 | read_sysreg_case(SYS_ID_MMFR5_EL1); |
965861d6 MR |
1136 | read_sysreg_case(SYS_ID_ISAR0_EL1); |
1137 | read_sysreg_case(SYS_ID_ISAR1_EL1); | |
1138 | read_sysreg_case(SYS_ID_ISAR2_EL1); | |
1139 | read_sysreg_case(SYS_ID_ISAR3_EL1); | |
1140 | read_sysreg_case(SYS_ID_ISAR4_EL1); | |
1141 | read_sysreg_case(SYS_ID_ISAR5_EL1); | |
8e3747be | 1142 | read_sysreg_case(SYS_ID_ISAR6_EL1); |
965861d6 MR |
1143 | read_sysreg_case(SYS_MVFR0_EL1); |
1144 | read_sysreg_case(SYS_MVFR1_EL1); | |
1145 | read_sysreg_case(SYS_MVFR2_EL1); | |
1146 | ||
1147 | read_sysreg_case(SYS_ID_AA64PFR0_EL1); | |
1148 | read_sysreg_case(SYS_ID_AA64PFR1_EL1); | |
78ed70bf | 1149 | read_sysreg_case(SYS_ID_AA64ZFR0_EL1); |
965861d6 MR |
1150 | read_sysreg_case(SYS_ID_AA64DFR0_EL1); |
1151 | read_sysreg_case(SYS_ID_AA64DFR1_EL1); | |
1152 | read_sysreg_case(SYS_ID_AA64MMFR0_EL1); | |
1153 | read_sysreg_case(SYS_ID_AA64MMFR1_EL1); | |
1154 | read_sysreg_case(SYS_ID_AA64MMFR2_EL1); | |
1155 | read_sysreg_case(SYS_ID_AA64ISAR0_EL1); | |
1156 | read_sysreg_case(SYS_ID_AA64ISAR1_EL1); | |
1157 | ||
1158 | read_sysreg_case(SYS_CNTFRQ_EL0); | |
1159 | read_sysreg_case(SYS_CTR_EL0); | |
1160 | read_sysreg_case(SYS_DCZID_EL0); | |
1161 | ||
92406f0c SP |
1162 | default: |
1163 | BUG(); | |
1164 | return 0; | |
1165 | } | |
1166 | } | |
1167 | ||
963fcd40 MZ |
1168 | #include <linux/irqchip/arm-gic-v3.h> |
1169 | ||
18ffa046 JM |
1170 | static bool |
1171 | feature_matches(u64 reg, const struct arm64_cpu_capabilities *entry) | |
1172 | { | |
28c5dcb2 | 1173 | int val = cpuid_feature_extract_field(reg, entry->field_pos, entry->sign); |
18ffa046 JM |
1174 | |
1175 | return val >= entry->min_field_value; | |
1176 | } | |
1177 | ||
da8d02d1 | 1178 | static bool |
92406f0c | 1179 | has_cpuid_feature(const struct arm64_cpu_capabilities *entry, int scope) |
da8d02d1 SP |
1180 | { |
1181 | u64 val; | |
94a9e04a | 1182 | |
92406f0c SP |
1183 | WARN_ON(scope == SCOPE_LOCAL_CPU && preemptible()); |
1184 | if (scope == SCOPE_SYSTEM) | |
46823dd1 | 1185 | val = read_sanitised_ftr_reg(entry->sys_reg); |
92406f0c | 1186 | else |
46823dd1 | 1187 | val = __read_sysreg_by_encoding(entry->sys_reg); |
92406f0c | 1188 | |
da8d02d1 SP |
1189 | return feature_matches(val, entry); |
1190 | } | |
338d4f49 | 1191 | |
92406f0c | 1192 | static bool has_useable_gicv3_cpuif(const struct arm64_cpu_capabilities *entry, int scope) |
963fcd40 MZ |
1193 | { |
1194 | bool has_sre; | |
1195 | ||
92406f0c | 1196 | if (!has_cpuid_feature(entry, scope)) |
963fcd40 MZ |
1197 | return false; |
1198 | ||
1199 | has_sre = gic_enable_sre(); | |
1200 | if (!has_sre) | |
1201 | pr_warn_once("%s present but disabled by higher exception level\n", | |
1202 | entry->desc); | |
1203 | ||
1204 | return has_sre; | |
1205 | } | |
1206 | ||
92406f0c | 1207 | static bool has_no_hw_prefetch(const struct arm64_cpu_capabilities *entry, int __unused) |
d5370f75 WD |
1208 | { |
1209 | u32 midr = read_cpuid_id(); | |
d5370f75 WD |
1210 | |
1211 | /* Cavium ThunderX pass 1.x and 2.x */ | |
b99286b0 | 1212 | return midr_is_cpu_model_range(midr, MIDR_THUNDERX, |
fa5ce3d1 RR |
1213 | MIDR_CPU_VAR_REV(0, 0), |
1214 | MIDR_CPU_VAR_REV(1, MIDR_REVISION_MASK)); | |
d5370f75 WD |
1215 | } |
1216 | ||
82e0191a SP |
1217 | static bool has_no_fpsimd(const struct arm64_cpu_capabilities *entry, int __unused) |
1218 | { | |
46823dd1 | 1219 | u64 pfr0 = read_sanitised_ftr_reg(SYS_ID_AA64PFR0_EL1); |
82e0191a SP |
1220 | |
1221 | return cpuid_feature_extract_signed_field(pfr0, | |
1222 | ID_AA64PFR0_FP_SHIFT) < 0; | |
1223 | } | |
1224 | ||
6ae4b6e0 | 1225 | static bool has_cache_idc(const struct arm64_cpu_capabilities *entry, |
8ab66cbe | 1226 | int scope) |
6ae4b6e0 | 1227 | { |
8ab66cbe SP |
1228 | u64 ctr; |
1229 | ||
1230 | if (scope == SCOPE_SYSTEM) | |
1231 | ctr = arm64_ftr_reg_ctrel0.sys_val; | |
1232 | else | |
1602df02 | 1233 | ctr = read_cpuid_effective_cachetype(); |
8ab66cbe SP |
1234 | |
1235 | return ctr & BIT(CTR_IDC_SHIFT); | |
6ae4b6e0 SD |
1236 | } |
1237 | ||
1602df02 SP |
1238 | static void cpu_emulate_effective_ctr(const struct arm64_cpu_capabilities *__unused) |
1239 | { | |
1240 | /* | |
1241 | * If the CPU exposes raw CTR_EL0.IDC = 0, while effectively | |
1242 | * CTR_EL0.IDC = 1 (from CLIDR values), we need to trap accesses | |
1243 | * to the CTR_EL0 on this CPU and emulate it with the real/safe | |
1244 | * value. | |
1245 | */ | |
1246 | if (!(read_cpuid_cachetype() & BIT(CTR_IDC_SHIFT))) | |
1247 | sysreg_clear_set(sctlr_el1, SCTLR_EL1_UCT, 0); | |
1248 | } | |
1249 | ||
6ae4b6e0 | 1250 | static bool has_cache_dic(const struct arm64_cpu_capabilities *entry, |
8ab66cbe | 1251 | int scope) |
6ae4b6e0 | 1252 | { |
8ab66cbe SP |
1253 | u64 ctr; |
1254 | ||
1255 | if (scope == SCOPE_SYSTEM) | |
1256 | ctr = arm64_ftr_reg_ctrel0.sys_val; | |
1257 | else | |
1258 | ctr = read_cpuid_cachetype(); | |
1259 | ||
1260 | return ctr & BIT(CTR_DIC_SHIFT); | |
6ae4b6e0 SD |
1261 | } |
1262 | ||
5ffdfaed VM |
1263 | static bool __maybe_unused |
1264 | has_useable_cnp(const struct arm64_cpu_capabilities *entry, int scope) | |
1265 | { | |
1266 | /* | |
1267 | * Kdump isn't guaranteed to power-off all secondary CPUs, CNP | |
1268 | * may share TLB entries with a CPU stuck in the crashed | |
1269 | * kernel. | |
1270 | */ | |
1271 | if (is_kdump_kernel()) | |
1272 | return false; | |
1273 | ||
1274 | return has_cpuid_feature(entry, scope); | |
1275 | } | |
1276 | ||
09e3c22a MB |
1277 | /* |
1278 | * This check is triggered during the early boot before the cpufeature | |
1279 | * is initialised. Checking the status on the local CPU allows the boot | |
1280 | * CPU to detect the need for non-global mappings and thus avoiding a | |
1281 | * pagetable re-write after all the CPUs are booted. This check will be | |
1282 | * anyway run on individual CPUs, allowing us to get the consistent | |
1283 | * state once the SMP CPUs are up and thus make the switch to non-global | |
1284 | * mappings if required. | |
1285 | */ | |
1286 | bool kaslr_requires_kpti(void) | |
1287 | { | |
09e3c22a MB |
1288 | if (!IS_ENABLED(CONFIG_RANDOMIZE_BASE)) |
1289 | return false; | |
1290 | ||
1291 | /* | |
1292 | * E0PD does a similar job to KPTI so can be used instead | |
1293 | * where available. | |
1294 | */ | |
1295 | if (IS_ENABLED(CONFIG_ARM64_E0PD)) { | |
a569f5f3 WD |
1296 | u64 mmfr2 = read_sysreg_s(SYS_ID_AA64MMFR2_EL1); |
1297 | if (cpuid_feature_extract_unsigned_field(mmfr2, | |
1298 | ID_AA64MMFR2_E0PD_SHIFT)) | |
09e3c22a MB |
1299 | return false; |
1300 | } | |
1301 | ||
1302 | /* | |
1303 | * Systems affected by Cavium erratum 24756 are incompatible | |
1304 | * with KPTI. | |
1305 | */ | |
ebac96ed | 1306 | if (IS_ENABLED(CONFIG_CAVIUM_ERRATUM_27456)) { |
09e3c22a MB |
1307 | extern const struct midr_range cavium_erratum_27456_cpus[]; |
1308 | ||
ebac96ed WD |
1309 | if (is_midr_in_range_list(read_cpuid_id(), |
1310 | cavium_erratum_27456_cpus)) | |
1311 | return false; | |
09e3c22a | 1312 | } |
09e3c22a MB |
1313 | |
1314 | return kaslr_offset() > 0; | |
1315 | } | |
1316 | ||
1b3ccf4b | 1317 | static bool __meltdown_safe = true; |
ea1e3de8 WD |
1318 | static int __kpti_forced; /* 0: not forced, >0: forced on, <0: forced off */ |
1319 | ||
1320 | static bool unmap_kernel_at_el0(const struct arm64_cpu_capabilities *entry, | |
d3aec8a2 | 1321 | int scope) |
ea1e3de8 | 1322 | { |
be5b2998 SP |
1323 | /* List of CPUs that are not vulnerable and don't need KPTI */ |
1324 | static const struct midr_range kpti_safe_list[] = { | |
1325 | MIDR_ALL_VERSIONS(MIDR_CAVIUM_THUNDERX2), | |
1326 | MIDR_ALL_VERSIONS(MIDR_BRCM_VULCAN), | |
31d868c4 | 1327 | MIDR_ALL_VERSIONS(MIDR_BRAHMA_B53), |
2a355ec2 WD |
1328 | MIDR_ALL_VERSIONS(MIDR_CORTEX_A35), |
1329 | MIDR_ALL_VERSIONS(MIDR_CORTEX_A53), | |
1330 | MIDR_ALL_VERSIONS(MIDR_CORTEX_A55), | |
1331 | MIDR_ALL_VERSIONS(MIDR_CORTEX_A57), | |
1332 | MIDR_ALL_VERSIONS(MIDR_CORTEX_A72), | |
1333 | MIDR_ALL_VERSIONS(MIDR_CORTEX_A73), | |
0ecc471a | 1334 | MIDR_ALL_VERSIONS(MIDR_HISI_TSV110), |
918e1946 | 1335 | MIDR_ALL_VERSIONS(MIDR_NVIDIA_CARMEL), |
f4617be3 SPR |
1336 | MIDR_ALL_VERSIONS(MIDR_QCOM_KRYO_3XX_SILVER), |
1337 | MIDR_ALL_VERSIONS(MIDR_QCOM_KRYO_4XX_SILVER), | |
71c751f2 | 1338 | { /* sentinel */ } |
be5b2998 | 1339 | }; |
a111b7c0 | 1340 | char const *str = "kpti command line option"; |
1b3ccf4b JL |
1341 | bool meltdown_safe; |
1342 | ||
1343 | meltdown_safe = is_midr_in_range_list(read_cpuid_id(), kpti_safe_list); | |
1344 | ||
1345 | /* Defer to CPU feature registers */ | |
1346 | if (has_cpuid_feature(entry, scope)) | |
1347 | meltdown_safe = true; | |
1348 | ||
1349 | if (!meltdown_safe) | |
1350 | __meltdown_safe = false; | |
179a56f6 | 1351 | |
6dc52b15 MZ |
1352 | /* |
1353 | * For reasons that aren't entirely clear, enabling KPTI on Cavium | |
1354 | * ThunderX leads to apparent I-cache corruption of kernel text, which | |
1355 | * ends as well as you might imagine. Don't even try. | |
1356 | */ | |
1357 | if (cpus_have_const_cap(ARM64_WORKAROUND_CAVIUM_27456)) { | |
1358 | str = "ARM64_WORKAROUND_CAVIUM_27456"; | |
1359 | __kpti_forced = -1; | |
1360 | } | |
1361 | ||
1b3ccf4b | 1362 | /* Useful for KASLR robustness */ |
c2d92353 | 1363 | if (kaslr_requires_kpti()) { |
1b3ccf4b JL |
1364 | if (!__kpti_forced) { |
1365 | str = "KASLR"; | |
1366 | __kpti_forced = 1; | |
1367 | } | |
1368 | } | |
1369 | ||
a111b7c0 JP |
1370 | if (cpu_mitigations_off() && !__kpti_forced) { |
1371 | str = "mitigations=off"; | |
1372 | __kpti_forced = -1; | |
1373 | } | |
1374 | ||
1b3ccf4b JL |
1375 | if (!IS_ENABLED(CONFIG_UNMAP_KERNEL_AT_EL0)) { |
1376 | pr_info_once("kernel page table isolation disabled by kernel configuration\n"); | |
1377 | return false; | |
1378 | } | |
1379 | ||
6dc52b15 | 1380 | /* Forced? */ |
ea1e3de8 | 1381 | if (__kpti_forced) { |
6dc52b15 MZ |
1382 | pr_info_once("kernel page table isolation forced %s by %s\n", |
1383 | __kpti_forced > 0 ? "ON" : "OFF", str); | |
ea1e3de8 WD |
1384 | return __kpti_forced > 0; |
1385 | } | |
1386 | ||
1b3ccf4b | 1387 | return !meltdown_safe; |
ea1e3de8 WD |
1388 | } |
1389 | ||
1b3ccf4b | 1390 | #ifdef CONFIG_UNMAP_KERNEL_AT_EL0 |
c0cda3b8 DM |
1391 | static void |
1392 | kpti_install_ng_mappings(const struct arm64_cpu_capabilities *__unused) | |
f992b4df WD |
1393 | { |
1394 | typedef void (kpti_remap_fn)(int, int, phys_addr_t); | |
1395 | extern kpti_remap_fn idmap_kpti_install_ng_mappings; | |
1396 | kpti_remap_fn *remap_fn; | |
1397 | ||
f992b4df WD |
1398 | int cpu = smp_processor_id(); |
1399 | ||
b89d82ef WD |
1400 | /* |
1401 | * We don't need to rewrite the page-tables if either we've done | |
1402 | * it already or we have KASLR enabled and therefore have not | |
1403 | * created any global mappings at all. | |
1404 | */ | |
09e3c22a | 1405 | if (arm64_use_ng_mappings) |
c0cda3b8 | 1406 | return; |
f992b4df WD |
1407 | |
1408 | remap_fn = (void *)__pa_symbol(idmap_kpti_install_ng_mappings); | |
1409 | ||
1410 | cpu_install_idmap(); | |
1411 | remap_fn(cpu, num_online_cpus(), __pa_symbol(swapper_pg_dir)); | |
1412 | cpu_uninstall_idmap(); | |
1413 | ||
1414 | if (!cpu) | |
09e3c22a | 1415 | arm64_use_ng_mappings = true; |
f992b4df | 1416 | |
c0cda3b8 | 1417 | return; |
f992b4df | 1418 | } |
1b3ccf4b JL |
1419 | #else |
1420 | static void | |
1421 | kpti_install_ng_mappings(const struct arm64_cpu_capabilities *__unused) | |
1422 | { | |
1423 | } | |
1424 | #endif /* CONFIG_UNMAP_KERNEL_AT_EL0 */ | |
f992b4df | 1425 | |
ea1e3de8 WD |
1426 | static int __init parse_kpti(char *str) |
1427 | { | |
1428 | bool enabled; | |
1429 | int ret = strtobool(str, &enabled); | |
1430 | ||
1431 | if (ret) | |
1432 | return ret; | |
1433 | ||
1434 | __kpti_forced = enabled ? 1 : -1; | |
1435 | return 0; | |
1436 | } | |
b5b7dd64 | 1437 | early_param("kpti", parse_kpti); |
ea1e3de8 | 1438 | |
05abb595 SP |
1439 | #ifdef CONFIG_ARM64_HW_AFDBM |
1440 | static inline void __cpu_enable_hw_dbm(void) | |
1441 | { | |
1442 | u64 tcr = read_sysreg(tcr_el1) | TCR_HD; | |
1443 | ||
1444 | write_sysreg(tcr, tcr_el1); | |
1445 | isb(); | |
1446 | } | |
1447 | ||
ece1397c SP |
1448 | static bool cpu_has_broken_dbm(void) |
1449 | { | |
1450 | /* List of CPUs which have broken DBM support. */ | |
1451 | static const struct midr_range cpus[] = { | |
1452 | #ifdef CONFIG_ARM64_ERRATUM_1024718 | |
1453 | MIDR_RANGE(MIDR_CORTEX_A55, 0, 0, 1, 0), // A55 r0p0 -r1p0 | |
9b23d95c SPR |
1454 | /* Kryo4xx Silver (rdpe => r1p0) */ |
1455 | MIDR_REV(MIDR_QCOM_KRYO_4XX_SILVER, 0xd, 0xe), | |
ece1397c SP |
1456 | #endif |
1457 | {}, | |
1458 | }; | |
1459 | ||
1460 | return is_midr_in_range_list(read_cpuid_id(), cpus); | |
1461 | } | |
1462 | ||
05abb595 SP |
1463 | static bool cpu_can_use_dbm(const struct arm64_cpu_capabilities *cap) |
1464 | { | |
ece1397c SP |
1465 | return has_cpuid_feature(cap, SCOPE_LOCAL_CPU) && |
1466 | !cpu_has_broken_dbm(); | |
05abb595 SP |
1467 | } |
1468 | ||
1469 | static void cpu_enable_hw_dbm(struct arm64_cpu_capabilities const *cap) | |
1470 | { | |
1471 | if (cpu_can_use_dbm(cap)) | |
1472 | __cpu_enable_hw_dbm(); | |
1473 | } | |
1474 | ||
1475 | static bool has_hw_dbm(const struct arm64_cpu_capabilities *cap, | |
1476 | int __unused) | |
1477 | { | |
1478 | static bool detected = false; | |
1479 | /* | |
1480 | * DBM is a non-conflicting feature. i.e, the kernel can safely | |
1481 | * run a mix of CPUs with and without the feature. So, we | |
1482 | * unconditionally enable the capability to allow any late CPU | |
1483 | * to use the feature. We only enable the control bits on the | |
1484 | * CPU, if it actually supports. | |
1485 | * | |
1486 | * We have to make sure we print the "feature" detection only | |
1487 | * when at least one CPU actually uses it. So check if this CPU | |
1488 | * can actually use it and print the message exactly once. | |
1489 | * | |
1490 | * This is safe as all CPUs (including secondary CPUs - due to the | |
1491 | * LOCAL_CPU scope - and the hotplugged CPUs - via verification) | |
1492 | * goes through the "matches" check exactly once. Also if a CPU | |
1493 | * matches the criteria, it is guaranteed that the CPU will turn | |
1494 | * the DBM on, as the capability is unconditionally enabled. | |
1495 | */ | |
1496 | if (!detected && cpu_can_use_dbm(cap)) { | |
1497 | detected = true; | |
1498 | pr_info("detected: Hardware dirty bit management\n"); | |
1499 | } | |
1500 | ||
1501 | return true; | |
1502 | } | |
1503 | ||
1504 | #endif | |
1505 | ||
2c9d45b4 IV |
1506 | #ifdef CONFIG_ARM64_AMU_EXTN |
1507 | ||
1508 | /* | |
1509 | * The "amu_cpus" cpumask only signals that the CPU implementation for the | |
1510 | * flagged CPUs supports the Activity Monitors Unit (AMU) but does not provide | |
1511 | * information regarding all the events that it supports. When a CPU bit is | |
1512 | * set in the cpumask, the user of this feature can only rely on the presence | |
1513 | * of the 4 fixed counters for that CPU. But this does not guarantee that the | |
1514 | * counters are enabled or access to these counters is enabled by code | |
1515 | * executed at higher exception levels (firmware). | |
1516 | */ | |
1517 | static struct cpumask amu_cpus __read_mostly; | |
1518 | ||
1519 | bool cpu_has_amu_feat(int cpu) | |
1520 | { | |
1521 | return cpumask_test_cpu(cpu, &amu_cpus); | |
1522 | } | |
1523 | ||
cd0ed03a IV |
1524 | /* Initialize the use of AMU counters for frequency invariance */ |
1525 | extern void init_cpu_freq_invariance_counters(void); | |
1526 | ||
2c9d45b4 IV |
1527 | static void cpu_amu_enable(struct arm64_cpu_capabilities const *cap) |
1528 | { | |
1529 | if (has_cpuid_feature(cap, SCOPE_LOCAL_CPU)) { | |
1530 | pr_info("detected CPU%d: Activity Monitors Unit (AMU)\n", | |
1531 | smp_processor_id()); | |
1532 | cpumask_set_cpu(smp_processor_id(), &amu_cpus); | |
cd0ed03a | 1533 | init_cpu_freq_invariance_counters(); |
2c9d45b4 IV |
1534 | } |
1535 | } | |
1536 | ||
1537 | static bool has_amu(const struct arm64_cpu_capabilities *cap, | |
1538 | int __unused) | |
1539 | { | |
1540 | /* | |
1541 | * The AMU extension is a non-conflicting feature: the kernel can | |
1542 | * safely run a mix of CPUs with and without support for the | |
1543 | * activity monitors extension. Therefore, unconditionally enable | |
1544 | * the capability to allow any late CPU to use the feature. | |
1545 | * | |
1546 | * With this feature unconditionally enabled, the cpu_enable | |
1547 | * function will be called for all CPUs that match the criteria, | |
1548 | * including secondary and hotplugged, marking this feature as | |
1549 | * present on that respective CPU. The enable function will also | |
1550 | * print a detection message. | |
1551 | */ | |
1552 | ||
1553 | return true; | |
1554 | } | |
1555 | #endif | |
1556 | ||
12eb3691 WD |
1557 | #ifdef CONFIG_ARM64_VHE |
1558 | static bool runs_at_el2(const struct arm64_cpu_capabilities *entry, int __unused) | |
1559 | { | |
1560 | return is_kernel_in_hyp_mode(); | |
1561 | } | |
1562 | ||
c0cda3b8 | 1563 | static void cpu_copy_el2regs(const struct arm64_cpu_capabilities *__unused) |
6d99b689 JM |
1564 | { |
1565 | /* | |
1566 | * Copy register values that aren't redirected by hardware. | |
1567 | * | |
1568 | * Before code patching, we only set tpidr_el1, all CPUs need to copy | |
1569 | * this value to tpidr_el2 before we patch the code. Once we've done | |
1570 | * that, freshly-onlined CPUs will set tpidr_el2, so we don't need to | |
1571 | * do anything here. | |
1572 | */ | |
e9ab7a2e | 1573 | if (!alternative_is_applied(ARM64_HAS_VIRT_HOST_EXTN)) |
6d99b689 | 1574 | write_sysreg(read_sysreg(tpidr_el1), tpidr_el2); |
6d99b689 | 1575 | } |
12eb3691 | 1576 | #endif |
6d99b689 | 1577 | |
e48d53a9 MZ |
1578 | static void cpu_has_fwb(const struct arm64_cpu_capabilities *__unused) |
1579 | { | |
1580 | u64 val = read_sysreg_s(SYS_CLIDR_EL1); | |
1581 | ||
1582 | /* Check that CLIDR_EL1.LOU{U,IS} are both 0 */ | |
1583 | WARN_ON(val & (7 << 27 | 7 << 21)); | |
1584 | } | |
1585 | ||
8f04e8e6 WD |
1586 | #ifdef CONFIG_ARM64_SSBD |
1587 | static int ssbs_emulation_handler(struct pt_regs *regs, u32 instr) | |
1588 | { | |
1589 | if (user_mode(regs)) | |
1590 | return 1; | |
1591 | ||
74e24828 | 1592 | if (instr & BIT(PSTATE_Imm_shift)) |
8f04e8e6 WD |
1593 | regs->pstate |= PSR_SSBS_BIT; |
1594 | else | |
1595 | regs->pstate &= ~PSR_SSBS_BIT; | |
1596 | ||
1597 | arm64_skip_faulting_instruction(regs, 4); | |
1598 | return 0; | |
1599 | } | |
1600 | ||
1601 | static struct undef_hook ssbs_emulation_hook = { | |
74e24828 SP |
1602 | .instr_mask = ~(1U << PSTATE_Imm_shift), |
1603 | .instr_val = 0xd500401f | PSTATE_SSBS, | |
8f04e8e6 WD |
1604 | .fn = ssbs_emulation_handler, |
1605 | }; | |
1606 | ||
1607 | static void cpu_enable_ssbs(const struct arm64_cpu_capabilities *__unused) | |
1608 | { | |
1609 | static bool undef_hook_registered = false; | |
27e6e7d6 | 1610 | static DEFINE_RAW_SPINLOCK(hook_lock); |
8f04e8e6 | 1611 | |
27e6e7d6 | 1612 | raw_spin_lock(&hook_lock); |
8f04e8e6 WD |
1613 | if (!undef_hook_registered) { |
1614 | register_undef_hook(&ssbs_emulation_hook); | |
1615 | undef_hook_registered = true; | |
1616 | } | |
27e6e7d6 | 1617 | raw_spin_unlock(&hook_lock); |
8f04e8e6 WD |
1618 | |
1619 | if (arm64_get_ssbd_state() == ARM64_SSBD_FORCE_DISABLE) { | |
1620 | sysreg_clear_set(sctlr_el1, 0, SCTLR_ELx_DSSBS); | |
1621 | arm64_set_ssbd_mitigation(false); | |
1622 | } else { | |
1623 | arm64_set_ssbd_mitigation(true); | |
1624 | } | |
1625 | } | |
1626 | #endif /* CONFIG_ARM64_SSBD */ | |
1627 | ||
b8925ee2 WD |
1628 | #ifdef CONFIG_ARM64_PAN |
1629 | static void cpu_enable_pan(const struct arm64_cpu_capabilities *__unused) | |
1630 | { | |
1631 | /* | |
1632 | * We modify PSTATE. This won't work from irq context as the PSTATE | |
1633 | * is discarded once we return from the exception. | |
1634 | */ | |
1635 | WARN_ON_ONCE(in_interrupt()); | |
1636 | ||
1637 | sysreg_clear_set(sctlr_el1, SCTLR_EL1_SPAN, 0); | |
1638 | asm(SET_PSTATE_PAN(1)); | |
1639 | } | |
1640 | #endif /* CONFIG_ARM64_PAN */ | |
1641 | ||
1642 | #ifdef CONFIG_ARM64_RAS_EXTN | |
1643 | static void cpu_clear_disr(const struct arm64_cpu_capabilities *__unused) | |
1644 | { | |
1645 | /* Firmware may have left a deferred SError in this register. */ | |
1646 | write_sysreg_s(0, SYS_DISR_EL1); | |
1647 | } | |
1648 | #endif /* CONFIG_ARM64_RAS_EXTN */ | |
1649 | ||
6984eb47 | 1650 | #ifdef CONFIG_ARM64_PTR_AUTH |
cfef06bd KM |
1651 | static bool has_address_auth(const struct arm64_cpu_capabilities *entry, |
1652 | int __unused) | |
1653 | { | |
1654 | return __system_matches_cap(ARM64_HAS_ADDRESS_AUTH_ARCH) || | |
1655 | __system_matches_cap(ARM64_HAS_ADDRESS_AUTH_IMP_DEF); | |
1656 | } | |
1657 | ||
1658 | static bool has_generic_auth(const struct arm64_cpu_capabilities *entry, | |
1659 | int __unused) | |
75031975 | 1660 | { |
cfef06bd KM |
1661 | return __system_matches_cap(ARM64_HAS_GENERIC_AUTH_ARCH) || |
1662 | __system_matches_cap(ARM64_HAS_GENERIC_AUTH_IMP_DEF); | |
75031975 | 1663 | } |
6984eb47 MR |
1664 | #endif /* CONFIG_ARM64_PTR_AUTH */ |
1665 | ||
3e6c69a0 MB |
1666 | #ifdef CONFIG_ARM64_E0PD |
1667 | static void cpu_enable_e0pd(struct arm64_cpu_capabilities const *cap) | |
1668 | { | |
1669 | if (this_cpu_has_cap(ARM64_HAS_E0PD)) | |
1670 | sysreg_clear_set(tcr_el1, 0, TCR_E0PD1); | |
1671 | } | |
1672 | #endif /* CONFIG_ARM64_E0PD */ | |
1673 | ||
b90d2b22 | 1674 | #ifdef CONFIG_ARM64_PSEUDO_NMI |
bc3c03cc JT |
1675 | static bool enable_pseudo_nmi; |
1676 | ||
1677 | static int __init early_enable_pseudo_nmi(char *p) | |
1678 | { | |
1679 | return strtobool(p, &enable_pseudo_nmi); | |
1680 | } | |
1681 | early_param("irqchip.gicv3_pseudo_nmi", early_enable_pseudo_nmi); | |
1682 | ||
b90d2b22 JT |
1683 | static bool can_use_gic_priorities(const struct arm64_cpu_capabilities *entry, |
1684 | int scope) | |
1685 | { | |
bc3c03cc | 1686 | return enable_pseudo_nmi && has_useable_gicv3_cpuif(entry, scope); |
b90d2b22 JT |
1687 | } |
1688 | #endif | |
1689 | ||
8ef8f360 DM |
1690 | #ifdef CONFIG_ARM64_BTI |
1691 | static void bti_enable(const struct arm64_cpu_capabilities *__unused) | |
1692 | { | |
1693 | /* | |
1694 | * Use of X16/X17 for tail-calls and trampolines that jump to | |
1695 | * function entry points using BR is a requirement for | |
1696 | * marking binaries with GNU_PROPERTY_AARCH64_FEATURE_1_BTI. | |
1697 | * So, be strict and forbid other BRs using other registers to | |
1698 | * jump onto a PACIxSP instruction: | |
1699 | */ | |
1700 | sysreg_clear_set(sctlr_el1, 0, SCTLR_EL1_BT0 | SCTLR_EL1_BT1); | |
1701 | isb(); | |
1702 | } | |
1703 | #endif /* CONFIG_ARM64_BTI */ | |
1704 | ||
8c176e16 ADK |
1705 | /* Internal helper functions to match cpu capability type */ |
1706 | static bool | |
1707 | cpucap_late_cpu_optional(const struct arm64_cpu_capabilities *cap) | |
1708 | { | |
1709 | return !!(cap->type & ARM64_CPUCAP_OPTIONAL_FOR_LATE_CPU); | |
1710 | } | |
1711 | ||
1712 | static bool | |
1713 | cpucap_late_cpu_permitted(const struct arm64_cpu_capabilities *cap) | |
1714 | { | |
1715 | return !!(cap->type & ARM64_CPUCAP_PERMITTED_FOR_LATE_CPU); | |
1716 | } | |
1717 | ||
deeaac51 KM |
1718 | static bool |
1719 | cpucap_panic_on_conflict(const struct arm64_cpu_capabilities *cap) | |
1720 | { | |
1721 | return !!(cap->type & ARM64_CPUCAP_PANIC_ON_CONFLICT); | |
1722 | } | |
1723 | ||
359b7064 | 1724 | static const struct arm64_cpu_capabilities arm64_features[] = { |
94a9e04a MZ |
1725 | { |
1726 | .desc = "GIC system register CPU interface", | |
1727 | .capability = ARM64_HAS_SYSREG_GIC_CPUIF, | |
c9bfdf73 | 1728 | .type = ARM64_CPUCAP_STRICT_BOOT_CPU_FEATURE, |
963fcd40 | 1729 | .matches = has_useable_gicv3_cpuif, |
da8d02d1 SP |
1730 | .sys_reg = SYS_ID_AA64PFR0_EL1, |
1731 | .field_pos = ID_AA64PFR0_GIC_SHIFT, | |
ff96f7bc | 1732 | .sign = FTR_UNSIGNED, |
18ffa046 | 1733 | .min_field_value = 1, |
94a9e04a | 1734 | }, |
338d4f49 JM |
1735 | #ifdef CONFIG_ARM64_PAN |
1736 | { | |
1737 | .desc = "Privileged Access Never", | |
1738 | .capability = ARM64_HAS_PAN, | |
5b4747c5 | 1739 | .type = ARM64_CPUCAP_SYSTEM_FEATURE, |
da8d02d1 SP |
1740 | .matches = has_cpuid_feature, |
1741 | .sys_reg = SYS_ID_AA64MMFR1_EL1, | |
1742 | .field_pos = ID_AA64MMFR1_PAN_SHIFT, | |
ff96f7bc | 1743 | .sign = FTR_UNSIGNED, |
338d4f49 | 1744 | .min_field_value = 1, |
c0cda3b8 | 1745 | .cpu_enable = cpu_enable_pan, |
338d4f49 JM |
1746 | }, |
1747 | #endif /* CONFIG_ARM64_PAN */ | |
395af861 | 1748 | #ifdef CONFIG_ARM64_LSE_ATOMICS |
2e94da13 WD |
1749 | { |
1750 | .desc = "LSE atomic instructions", | |
1751 | .capability = ARM64_HAS_LSE_ATOMICS, | |
5b4747c5 | 1752 | .type = ARM64_CPUCAP_SYSTEM_FEATURE, |
da8d02d1 SP |
1753 | .matches = has_cpuid_feature, |
1754 | .sys_reg = SYS_ID_AA64ISAR0_EL1, | |
1755 | .field_pos = ID_AA64ISAR0_ATOMICS_SHIFT, | |
ff96f7bc | 1756 | .sign = FTR_UNSIGNED, |
2e94da13 WD |
1757 | .min_field_value = 2, |
1758 | }, | |
395af861 | 1759 | #endif /* CONFIG_ARM64_LSE_ATOMICS */ |
d5370f75 WD |
1760 | { |
1761 | .desc = "Software prefetching using PRFM", | |
1762 | .capability = ARM64_HAS_NO_HW_PREFETCH, | |
5c137714 | 1763 | .type = ARM64_CPUCAP_WEAK_LOCAL_CPU_FEATURE, |
d5370f75 WD |
1764 | .matches = has_no_hw_prefetch, |
1765 | }, | |
57f4959b JM |
1766 | #ifdef CONFIG_ARM64_UAO |
1767 | { | |
1768 | .desc = "User Access Override", | |
1769 | .capability = ARM64_HAS_UAO, | |
5b4747c5 | 1770 | .type = ARM64_CPUCAP_SYSTEM_FEATURE, |
57f4959b JM |
1771 | .matches = has_cpuid_feature, |
1772 | .sys_reg = SYS_ID_AA64MMFR2_EL1, | |
1773 | .field_pos = ID_AA64MMFR2_UAO_SHIFT, | |
1774 | .min_field_value = 1, | |
c8b06e3f JM |
1775 | /* |
1776 | * We rely on stop_machine() calling uao_thread_switch() to set | |
1777 | * UAO immediately after patching. | |
1778 | */ | |
57f4959b JM |
1779 | }, |
1780 | #endif /* CONFIG_ARM64_UAO */ | |
70544196 JM |
1781 | #ifdef CONFIG_ARM64_PAN |
1782 | { | |
1783 | .capability = ARM64_ALT_PAN_NOT_UAO, | |
5b4747c5 | 1784 | .type = ARM64_CPUCAP_SYSTEM_FEATURE, |
70544196 JM |
1785 | .matches = cpufeature_pan_not_uao, |
1786 | }, | |
1787 | #endif /* CONFIG_ARM64_PAN */ | |
830dcc9f | 1788 | #ifdef CONFIG_ARM64_VHE |
d88701be MZ |
1789 | { |
1790 | .desc = "Virtualization Host Extensions", | |
1791 | .capability = ARM64_HAS_VIRT_HOST_EXTN, | |
830dcc9f | 1792 | .type = ARM64_CPUCAP_STRICT_BOOT_CPU_FEATURE, |
d88701be | 1793 | .matches = runs_at_el2, |
c0cda3b8 | 1794 | .cpu_enable = cpu_copy_el2regs, |
d88701be | 1795 | }, |
830dcc9f | 1796 | #endif /* CONFIG_ARM64_VHE */ |
042446a3 SP |
1797 | { |
1798 | .desc = "32-bit EL0 Support", | |
1799 | .capability = ARM64_HAS_32BIT_EL0, | |
5b4747c5 | 1800 | .type = ARM64_CPUCAP_SYSTEM_FEATURE, |
042446a3 SP |
1801 | .matches = has_cpuid_feature, |
1802 | .sys_reg = SYS_ID_AA64PFR0_EL1, | |
1803 | .sign = FTR_UNSIGNED, | |
1804 | .field_pos = ID_AA64PFR0_EL0_SHIFT, | |
1805 | .min_field_value = ID_AA64PFR0_EL0_32BIT_64BIT, | |
1806 | }, | |
540f76d1 WD |
1807 | #ifdef CONFIG_KVM |
1808 | { | |
1809 | .desc = "32-bit EL1 Support", | |
1810 | .capability = ARM64_HAS_32BIT_EL1, | |
1811 | .type = ARM64_CPUCAP_SYSTEM_FEATURE, | |
1812 | .matches = has_cpuid_feature, | |
1813 | .sys_reg = SYS_ID_AA64PFR0_EL1, | |
1814 | .sign = FTR_UNSIGNED, | |
1815 | .field_pos = ID_AA64PFR0_EL1_SHIFT, | |
1816 | .min_field_value = ID_AA64PFR0_EL1_32BIT_64BIT, | |
1817 | }, | |
1818 | #endif | |
ea1e3de8 | 1819 | { |
179a56f6 | 1820 | .desc = "Kernel page table isolation (KPTI)", |
ea1e3de8 | 1821 | .capability = ARM64_UNMAP_KERNEL_AT_EL0, |
d3aec8a2 SP |
1822 | .type = ARM64_CPUCAP_BOOT_RESTRICTED_CPU_LOCAL_FEATURE, |
1823 | /* | |
1824 | * The ID feature fields below are used to indicate that | |
1825 | * the CPU doesn't need KPTI. See unmap_kernel_at_el0 for | |
1826 | * more details. | |
1827 | */ | |
1828 | .sys_reg = SYS_ID_AA64PFR0_EL1, | |
1829 | .field_pos = ID_AA64PFR0_CSV3_SHIFT, | |
1830 | .min_field_value = 1, | |
ea1e3de8 | 1831 | .matches = unmap_kernel_at_el0, |
c0cda3b8 | 1832 | .cpu_enable = kpti_install_ng_mappings, |
ea1e3de8 | 1833 | }, |
82e0191a SP |
1834 | { |
1835 | /* FP/SIMD is not implemented */ | |
1836 | .capability = ARM64_HAS_NO_FPSIMD, | |
449443c0 | 1837 | .type = ARM64_CPUCAP_BOOT_RESTRICTED_CPU_LOCAL_FEATURE, |
82e0191a SP |
1838 | .min_field_value = 0, |
1839 | .matches = has_no_fpsimd, | |
1840 | }, | |
d50e071f RM |
1841 | #ifdef CONFIG_ARM64_PMEM |
1842 | { | |
1843 | .desc = "Data cache clean to Point of Persistence", | |
1844 | .capability = ARM64_HAS_DCPOP, | |
5b4747c5 | 1845 | .type = ARM64_CPUCAP_SYSTEM_FEATURE, |
d50e071f RM |
1846 | .matches = has_cpuid_feature, |
1847 | .sys_reg = SYS_ID_AA64ISAR1_EL1, | |
1848 | .field_pos = ID_AA64ISAR1_DPB_SHIFT, | |
1849 | .min_field_value = 1, | |
1850 | }, | |
b9585f53 AM |
1851 | { |
1852 | .desc = "Data cache clean to Point of Deep Persistence", | |
1853 | .capability = ARM64_HAS_DCPODP, | |
1854 | .type = ARM64_CPUCAP_SYSTEM_FEATURE, | |
1855 | .matches = has_cpuid_feature, | |
1856 | .sys_reg = SYS_ID_AA64ISAR1_EL1, | |
1857 | .sign = FTR_UNSIGNED, | |
1858 | .field_pos = ID_AA64ISAR1_DPB_SHIFT, | |
1859 | .min_field_value = 2, | |
1860 | }, | |
d50e071f | 1861 | #endif |
43994d82 DM |
1862 | #ifdef CONFIG_ARM64_SVE |
1863 | { | |
1864 | .desc = "Scalable Vector Extension", | |
5b4747c5 | 1865 | .type = ARM64_CPUCAP_SYSTEM_FEATURE, |
43994d82 | 1866 | .capability = ARM64_SVE, |
43994d82 DM |
1867 | .sys_reg = SYS_ID_AA64PFR0_EL1, |
1868 | .sign = FTR_UNSIGNED, | |
1869 | .field_pos = ID_AA64PFR0_SVE_SHIFT, | |
1870 | .min_field_value = ID_AA64PFR0_SVE, | |
1871 | .matches = has_cpuid_feature, | |
c0cda3b8 | 1872 | .cpu_enable = sve_kernel_enable, |
43994d82 DM |
1873 | }, |
1874 | #endif /* CONFIG_ARM64_SVE */ | |
64c02720 XX |
1875 | #ifdef CONFIG_ARM64_RAS_EXTN |
1876 | { | |
1877 | .desc = "RAS Extension Support", | |
1878 | .capability = ARM64_HAS_RAS_EXTN, | |
5b4747c5 | 1879 | .type = ARM64_CPUCAP_SYSTEM_FEATURE, |
64c02720 XX |
1880 | .matches = has_cpuid_feature, |
1881 | .sys_reg = SYS_ID_AA64PFR0_EL1, | |
1882 | .sign = FTR_UNSIGNED, | |
1883 | .field_pos = ID_AA64PFR0_RAS_SHIFT, | |
1884 | .min_field_value = ID_AA64PFR0_RAS_V1, | |
c0cda3b8 | 1885 | .cpu_enable = cpu_clear_disr, |
64c02720 XX |
1886 | }, |
1887 | #endif /* CONFIG_ARM64_RAS_EXTN */ | |
2c9d45b4 IV |
1888 | #ifdef CONFIG_ARM64_AMU_EXTN |
1889 | { | |
1890 | /* | |
1891 | * The feature is enabled by default if CONFIG_ARM64_AMU_EXTN=y. | |
1892 | * Therefore, don't provide .desc as we don't want the detection | |
1893 | * message to be shown until at least one CPU is detected to | |
1894 | * support the feature. | |
1895 | */ | |
1896 | .capability = ARM64_HAS_AMU_EXTN, | |
1897 | .type = ARM64_CPUCAP_WEAK_LOCAL_CPU_FEATURE, | |
1898 | .matches = has_amu, | |
1899 | .sys_reg = SYS_ID_AA64PFR0_EL1, | |
1900 | .sign = FTR_UNSIGNED, | |
1901 | .field_pos = ID_AA64PFR0_AMU_SHIFT, | |
1902 | .min_field_value = ID_AA64PFR0_AMU, | |
1903 | .cpu_enable = cpu_amu_enable, | |
1904 | }, | |
1905 | #endif /* CONFIG_ARM64_AMU_EXTN */ | |
6ae4b6e0 SD |
1906 | { |
1907 | .desc = "Data cache clean to the PoU not required for I/D coherence", | |
1908 | .capability = ARM64_HAS_CACHE_IDC, | |
5b4747c5 | 1909 | .type = ARM64_CPUCAP_SYSTEM_FEATURE, |
6ae4b6e0 | 1910 | .matches = has_cache_idc, |
1602df02 | 1911 | .cpu_enable = cpu_emulate_effective_ctr, |
6ae4b6e0 SD |
1912 | }, |
1913 | { | |
1914 | .desc = "Instruction cache invalidation not required for I/D coherence", | |
1915 | .capability = ARM64_HAS_CACHE_DIC, | |
5b4747c5 | 1916 | .type = ARM64_CPUCAP_SYSTEM_FEATURE, |
6ae4b6e0 SD |
1917 | .matches = has_cache_dic, |
1918 | }, | |
e48d53a9 MZ |
1919 | { |
1920 | .desc = "Stage-2 Force Write-Back", | |
1921 | .type = ARM64_CPUCAP_SYSTEM_FEATURE, | |
1922 | .capability = ARM64_HAS_STAGE2_FWB, | |
1923 | .sys_reg = SYS_ID_AA64MMFR2_EL1, | |
1924 | .sign = FTR_UNSIGNED, | |
1925 | .field_pos = ID_AA64MMFR2_FWB_SHIFT, | |
1926 | .min_field_value = 1, | |
1927 | .matches = has_cpuid_feature, | |
1928 | .cpu_enable = cpu_has_fwb, | |
1929 | }, | |
552ae76f MZ |
1930 | { |
1931 | .desc = "ARMv8.4 Translation Table Level", | |
1932 | .type = ARM64_CPUCAP_SYSTEM_FEATURE, | |
1933 | .capability = ARM64_HAS_ARMv8_4_TTL, | |
1934 | .sys_reg = SYS_ID_AA64MMFR2_EL1, | |
1935 | .sign = FTR_UNSIGNED, | |
1936 | .field_pos = ID_AA64MMFR2_TTL_SHIFT, | |
1937 | .min_field_value = 1, | |
1938 | .matches = has_cpuid_feature, | |
1939 | }, | |
b620ba54 ZY |
1940 | { |
1941 | .desc = "TLB range maintenance instructions", | |
1942 | .capability = ARM64_HAS_TLB_RANGE, | |
1943 | .type = ARM64_CPUCAP_SYSTEM_FEATURE, | |
1944 | .matches = has_cpuid_feature, | |
1945 | .sys_reg = SYS_ID_AA64ISAR0_EL1, | |
1946 | .field_pos = ID_AA64ISAR0_TLB_SHIFT, | |
1947 | .sign = FTR_UNSIGNED, | |
1948 | .min_field_value = ID_AA64ISAR0_TLB_RANGE, | |
1949 | }, | |
05abb595 SP |
1950 | #ifdef CONFIG_ARM64_HW_AFDBM |
1951 | { | |
1952 | /* | |
1953 | * Since we turn this on always, we don't want the user to | |
1954 | * think that the feature is available when it may not be. | |
1955 | * So hide the description. | |
1956 | * | |
1957 | * .desc = "Hardware pagetable Dirty Bit Management", | |
1958 | * | |
1959 | */ | |
1960 | .type = ARM64_CPUCAP_WEAK_LOCAL_CPU_FEATURE, | |
1961 | .capability = ARM64_HW_DBM, | |
1962 | .sys_reg = SYS_ID_AA64MMFR1_EL1, | |
1963 | .sign = FTR_UNSIGNED, | |
1964 | .field_pos = ID_AA64MMFR1_HADBS_SHIFT, | |
1965 | .min_field_value = 2, | |
1966 | .matches = has_hw_dbm, | |
1967 | .cpu_enable = cpu_enable_hw_dbm, | |
1968 | }, | |
1969 | #endif | |
86d0dd34 AB |
1970 | { |
1971 | .desc = "CRC32 instructions", | |
1972 | .capability = ARM64_HAS_CRC32, | |
1973 | .type = ARM64_CPUCAP_SYSTEM_FEATURE, | |
1974 | .matches = has_cpuid_feature, | |
1975 | .sys_reg = SYS_ID_AA64ISAR0_EL1, | |
1976 | .field_pos = ID_AA64ISAR0_CRC32_SHIFT, | |
1977 | .min_field_value = 1, | |
1978 | }, | |
4f9f4964 | 1979 | #ifdef CONFIG_ARM64_SSBD |
d71be2b6 WD |
1980 | { |
1981 | .desc = "Speculative Store Bypassing Safe (SSBS)", | |
1982 | .capability = ARM64_SSBS, | |
1983 | .type = ARM64_CPUCAP_WEAK_LOCAL_CPU_FEATURE, | |
1984 | .matches = has_cpuid_feature, | |
1985 | .sys_reg = SYS_ID_AA64PFR1_EL1, | |
1986 | .field_pos = ID_AA64PFR1_SSBS_SHIFT, | |
1987 | .sign = FTR_UNSIGNED, | |
1988 | .min_field_value = ID_AA64PFR1_SSBS_PSTATE_ONLY, | |
8f04e8e6 | 1989 | .cpu_enable = cpu_enable_ssbs, |
d71be2b6 | 1990 | }, |
5ffdfaed VM |
1991 | #endif |
1992 | #ifdef CONFIG_ARM64_CNP | |
1993 | { | |
1994 | .desc = "Common not Private translations", | |
1995 | .capability = ARM64_HAS_CNP, | |
1996 | .type = ARM64_CPUCAP_SYSTEM_FEATURE, | |
1997 | .matches = has_useable_cnp, | |
1998 | .sys_reg = SYS_ID_AA64MMFR2_EL1, | |
1999 | .sign = FTR_UNSIGNED, | |
2000 | .field_pos = ID_AA64MMFR2_CNP_SHIFT, | |
2001 | .min_field_value = 1, | |
2002 | .cpu_enable = cpu_enable_cnp, | |
2003 | }, | |
8f04e8e6 | 2004 | #endif |
bd4fb6d2 WD |
2005 | { |
2006 | .desc = "Speculation barrier (SB)", | |
2007 | .capability = ARM64_HAS_SB, | |
2008 | .type = ARM64_CPUCAP_SYSTEM_FEATURE, | |
2009 | .matches = has_cpuid_feature, | |
2010 | .sys_reg = SYS_ID_AA64ISAR1_EL1, | |
2011 | .field_pos = ID_AA64ISAR1_SB_SHIFT, | |
2012 | .sign = FTR_UNSIGNED, | |
2013 | .min_field_value = 1, | |
2014 | }, | |
6984eb47 MR |
2015 | #ifdef CONFIG_ARM64_PTR_AUTH |
2016 | { | |
2017 | .desc = "Address authentication (architected algorithm)", | |
2018 | .capability = ARM64_HAS_ADDRESS_AUTH_ARCH, | |
6982934e | 2019 | .type = ARM64_CPUCAP_BOOT_CPU_FEATURE, |
6984eb47 MR |
2020 | .sys_reg = SYS_ID_AA64ISAR1_EL1, |
2021 | .sign = FTR_UNSIGNED, | |
2022 | .field_pos = ID_AA64ISAR1_APA_SHIFT, | |
2023 | .min_field_value = ID_AA64ISAR1_APA_ARCHITECTED, | |
2024 | .matches = has_cpuid_feature, | |
2025 | }, | |
2026 | { | |
2027 | .desc = "Address authentication (IMP DEF algorithm)", | |
2028 | .capability = ARM64_HAS_ADDRESS_AUTH_IMP_DEF, | |
6982934e | 2029 | .type = ARM64_CPUCAP_BOOT_CPU_FEATURE, |
6984eb47 MR |
2030 | .sys_reg = SYS_ID_AA64ISAR1_EL1, |
2031 | .sign = FTR_UNSIGNED, | |
2032 | .field_pos = ID_AA64ISAR1_API_SHIFT, | |
2033 | .min_field_value = ID_AA64ISAR1_API_IMP_DEF, | |
2034 | .matches = has_cpuid_feature, | |
cfef06bd KM |
2035 | }, |
2036 | { | |
2037 | .capability = ARM64_HAS_ADDRESS_AUTH, | |
6982934e | 2038 | .type = ARM64_CPUCAP_BOOT_CPU_FEATURE, |
cfef06bd | 2039 | .matches = has_address_auth, |
6984eb47 MR |
2040 | }, |
2041 | { | |
2042 | .desc = "Generic authentication (architected algorithm)", | |
2043 | .capability = ARM64_HAS_GENERIC_AUTH_ARCH, | |
2044 | .type = ARM64_CPUCAP_SYSTEM_FEATURE, | |
2045 | .sys_reg = SYS_ID_AA64ISAR1_EL1, | |
2046 | .sign = FTR_UNSIGNED, | |
2047 | .field_pos = ID_AA64ISAR1_GPA_SHIFT, | |
2048 | .min_field_value = ID_AA64ISAR1_GPA_ARCHITECTED, | |
2049 | .matches = has_cpuid_feature, | |
2050 | }, | |
2051 | { | |
2052 | .desc = "Generic authentication (IMP DEF algorithm)", | |
2053 | .capability = ARM64_HAS_GENERIC_AUTH_IMP_DEF, | |
2054 | .type = ARM64_CPUCAP_SYSTEM_FEATURE, | |
2055 | .sys_reg = SYS_ID_AA64ISAR1_EL1, | |
2056 | .sign = FTR_UNSIGNED, | |
2057 | .field_pos = ID_AA64ISAR1_GPI_SHIFT, | |
2058 | .min_field_value = ID_AA64ISAR1_GPI_IMP_DEF, | |
2059 | .matches = has_cpuid_feature, | |
2060 | }, | |
cfef06bd KM |
2061 | { |
2062 | .capability = ARM64_HAS_GENERIC_AUTH, | |
2063 | .type = ARM64_CPUCAP_SYSTEM_FEATURE, | |
2064 | .matches = has_generic_auth, | |
2065 | }, | |
6984eb47 | 2066 | #endif /* CONFIG_ARM64_PTR_AUTH */ |
b90d2b22 JT |
2067 | #ifdef CONFIG_ARM64_PSEUDO_NMI |
2068 | { | |
2069 | /* | |
2070 | * Depends on having GICv3 | |
2071 | */ | |
2072 | .desc = "IRQ priority masking", | |
2073 | .capability = ARM64_HAS_IRQ_PRIO_MASKING, | |
2074 | .type = ARM64_CPUCAP_STRICT_BOOT_CPU_FEATURE, | |
2075 | .matches = can_use_gic_priorities, | |
2076 | .sys_reg = SYS_ID_AA64PFR0_EL1, | |
2077 | .field_pos = ID_AA64PFR0_GIC_SHIFT, | |
2078 | .sign = FTR_UNSIGNED, | |
2079 | .min_field_value = 1, | |
2080 | }, | |
3e6c69a0 MB |
2081 | #endif |
2082 | #ifdef CONFIG_ARM64_E0PD | |
2083 | { | |
2084 | .desc = "E0PD", | |
2085 | .capability = ARM64_HAS_E0PD, | |
2086 | .type = ARM64_CPUCAP_SYSTEM_FEATURE, | |
2087 | .sys_reg = SYS_ID_AA64MMFR2_EL1, | |
2088 | .sign = FTR_UNSIGNED, | |
2089 | .field_pos = ID_AA64MMFR2_E0PD_SHIFT, | |
2090 | .matches = has_cpuid_feature, | |
2091 | .min_field_value = 1, | |
2092 | .cpu_enable = cpu_enable_e0pd, | |
2093 | }, | |
bc206065 | 2094 | #endif |
1a50ec0b RH |
2095 | #ifdef CONFIG_ARCH_RANDOM |
2096 | { | |
2097 | .desc = "Random Number Generator", | |
2098 | .capability = ARM64_HAS_RNG, | |
2099 | .type = ARM64_CPUCAP_SYSTEM_FEATURE, | |
2100 | .matches = has_cpuid_feature, | |
2101 | .sys_reg = SYS_ID_AA64ISAR0_EL1, | |
2102 | .field_pos = ID_AA64ISAR0_RNDR_SHIFT, | |
2103 | .sign = FTR_UNSIGNED, | |
2104 | .min_field_value = 1, | |
2105 | }, | |
8ef8f360 DM |
2106 | #endif |
2107 | #ifdef CONFIG_ARM64_BTI | |
2108 | { | |
2109 | .desc = "Branch Target Identification", | |
2110 | .capability = ARM64_BTI, | |
c8027285 MB |
2111 | #ifdef CONFIG_ARM64_BTI_KERNEL |
2112 | .type = ARM64_CPUCAP_STRICT_BOOT_CPU_FEATURE, | |
2113 | #else | |
8ef8f360 | 2114 | .type = ARM64_CPUCAP_SYSTEM_FEATURE, |
c8027285 | 2115 | #endif |
8ef8f360 DM |
2116 | .matches = has_cpuid_feature, |
2117 | .cpu_enable = bti_enable, | |
2118 | .sys_reg = SYS_ID_AA64PFR1_EL1, | |
2119 | .field_pos = ID_AA64PFR1_BT_SHIFT, | |
2120 | .min_field_value = ID_AA64PFR1_BT_BTI, | |
2121 | .sign = FTR_UNSIGNED, | |
2122 | }, | |
b90d2b22 | 2123 | #endif |
359b7064 MZ |
2124 | {}, |
2125 | }; | |
2126 | ||
1e013d06 WD |
2127 | #define HWCAP_CPUID_MATCH(reg, field, s, min_value) \ |
2128 | .matches = has_cpuid_feature, \ | |
2129 | .sys_reg = reg, \ | |
2130 | .field_pos = field, \ | |
2131 | .sign = s, \ | |
2132 | .min_field_value = min_value, | |
2133 | ||
2134 | #define __HWCAP_CAP(name, cap_type, cap) \ | |
2135 | .desc = name, \ | |
2136 | .type = ARM64_CPUCAP_SYSTEM_FEATURE, \ | |
2137 | .hwcap_type = cap_type, \ | |
2138 | .hwcap = cap, \ | |
2139 | ||
2140 | #define HWCAP_CAP(reg, field, s, min_value, cap_type, cap) \ | |
2141 | { \ | |
2142 | __HWCAP_CAP(#cap, cap_type, cap) \ | |
2143 | HWCAP_CPUID_MATCH(reg, field, s, min_value) \ | |
37b01d53 SP |
2144 | } |
2145 | ||
1e013d06 WD |
2146 | #define HWCAP_MULTI_CAP(list, cap_type, cap) \ |
2147 | { \ | |
2148 | __HWCAP_CAP(#cap, cap_type, cap) \ | |
2149 | .matches = cpucap_multi_entry_cap_matches, \ | |
2150 | .match_list = list, \ | |
2151 | } | |
2152 | ||
7559950a SP |
2153 | #define HWCAP_CAP_MATCH(match, cap_type, cap) \ |
2154 | { \ | |
2155 | __HWCAP_CAP(#cap, cap_type, cap) \ | |
2156 | .matches = match, \ | |
2157 | } | |
2158 | ||
1e013d06 WD |
2159 | #ifdef CONFIG_ARM64_PTR_AUTH |
2160 | static const struct arm64_cpu_capabilities ptr_auth_hwcap_addr_matches[] = { | |
2161 | { | |
2162 | HWCAP_CPUID_MATCH(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_APA_SHIFT, | |
2163 | FTR_UNSIGNED, ID_AA64ISAR1_APA_ARCHITECTED) | |
2164 | }, | |
2165 | { | |
2166 | HWCAP_CPUID_MATCH(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_API_SHIFT, | |
2167 | FTR_UNSIGNED, ID_AA64ISAR1_API_IMP_DEF) | |
2168 | }, | |
2169 | {}, | |
2170 | }; | |
2171 | ||
2172 | static const struct arm64_cpu_capabilities ptr_auth_hwcap_gen_matches[] = { | |
2173 | { | |
2174 | HWCAP_CPUID_MATCH(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_GPA_SHIFT, | |
2175 | FTR_UNSIGNED, ID_AA64ISAR1_GPA_ARCHITECTED) | |
2176 | }, | |
2177 | { | |
2178 | HWCAP_CPUID_MATCH(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_GPI_SHIFT, | |
2179 | FTR_UNSIGNED, ID_AA64ISAR1_GPI_IMP_DEF) | |
2180 | }, | |
2181 | {}, | |
2182 | }; | |
2183 | #endif | |
2184 | ||
f3efb675 | 2185 | static const struct arm64_cpu_capabilities arm64_elf_hwcaps[] = { |
aaba098f AM |
2186 | HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_AES_SHIFT, FTR_UNSIGNED, 2, CAP_HWCAP, KERNEL_HWCAP_PMULL), |
2187 | HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_AES_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_AES), | |
2188 | HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_SHA1_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_SHA1), | |
2189 | HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_SHA2_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_SHA2), | |
2190 | HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_SHA2_SHIFT, FTR_UNSIGNED, 2, CAP_HWCAP, KERNEL_HWCAP_SHA512), | |
2191 | HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_CRC32_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_CRC32), | |
2192 | HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_ATOMICS_SHIFT, FTR_UNSIGNED, 2, CAP_HWCAP, KERNEL_HWCAP_ATOMICS), | |
2193 | HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_RDM_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_ASIMDRDM), | |
2194 | HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_SHA3_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_SHA3), | |
2195 | HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_SM3_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_SM3), | |
2196 | HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_SM4_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_SM4), | |
2197 | HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_DP_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_ASIMDDP), | |
2198 | HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_FHM_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_ASIMDFHM), | |
2199 | HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_TS_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_FLAGM), | |
12019374 | 2200 | HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_TS_SHIFT, FTR_UNSIGNED, 2, CAP_HWCAP, KERNEL_HWCAP_FLAGM2), |
1a50ec0b | 2201 | HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_RNDR_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_RNG), |
aaba098f AM |
2202 | HWCAP_CAP(SYS_ID_AA64PFR0_EL1, ID_AA64PFR0_FP_SHIFT, FTR_SIGNED, 0, CAP_HWCAP, KERNEL_HWCAP_FP), |
2203 | HWCAP_CAP(SYS_ID_AA64PFR0_EL1, ID_AA64PFR0_FP_SHIFT, FTR_SIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_FPHP), | |
2204 | HWCAP_CAP(SYS_ID_AA64PFR0_EL1, ID_AA64PFR0_ASIMD_SHIFT, FTR_SIGNED, 0, CAP_HWCAP, KERNEL_HWCAP_ASIMD), | |
2205 | HWCAP_CAP(SYS_ID_AA64PFR0_EL1, ID_AA64PFR0_ASIMD_SHIFT, FTR_SIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_ASIMDHP), | |
2206 | HWCAP_CAP(SYS_ID_AA64PFR0_EL1, ID_AA64PFR0_DIT_SHIFT, FTR_SIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_DIT), | |
2207 | HWCAP_CAP(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_DPB_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_DCPOP), | |
671db581 | 2208 | HWCAP_CAP(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_DPB_SHIFT, FTR_UNSIGNED, 2, CAP_HWCAP, KERNEL_HWCAP_DCPODP), |
aaba098f AM |
2209 | HWCAP_CAP(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_JSCVT_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_JSCVT), |
2210 | HWCAP_CAP(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_FCMA_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_FCMA), | |
2211 | HWCAP_CAP(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_LRCPC_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_LRCPC), | |
2212 | HWCAP_CAP(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_LRCPC_SHIFT, FTR_UNSIGNED, 2, CAP_HWCAP, KERNEL_HWCAP_ILRCPC), | |
ca9503fc | 2213 | HWCAP_CAP(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_FRINTTS_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_FRINT), |
aaba098f | 2214 | HWCAP_CAP(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_SB_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_SB), |
d4209d8b SP |
2215 | HWCAP_CAP(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_BF16_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_BF16), |
2216 | HWCAP_CAP(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_DGH_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_DGH), | |
2217 | HWCAP_CAP(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_I8MM_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_I8MM), | |
aaba098f | 2218 | HWCAP_CAP(SYS_ID_AA64MMFR2_EL1, ID_AA64MMFR2_AT_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_USCAT), |
43994d82 | 2219 | #ifdef CONFIG_ARM64_SVE |
aaba098f | 2220 | HWCAP_CAP(SYS_ID_AA64PFR0_EL1, ID_AA64PFR0_SVE_SHIFT, FTR_UNSIGNED, ID_AA64PFR0_SVE, CAP_HWCAP, KERNEL_HWCAP_SVE), |
06a916fe DM |
2221 | HWCAP_CAP(SYS_ID_AA64ZFR0_EL1, ID_AA64ZFR0_SVEVER_SHIFT, FTR_UNSIGNED, ID_AA64ZFR0_SVEVER_SVE2, CAP_HWCAP, KERNEL_HWCAP_SVE2), |
2222 | HWCAP_CAP(SYS_ID_AA64ZFR0_EL1, ID_AA64ZFR0_AES_SHIFT, FTR_UNSIGNED, ID_AA64ZFR0_AES, CAP_HWCAP, KERNEL_HWCAP_SVEAES), | |
2223 | HWCAP_CAP(SYS_ID_AA64ZFR0_EL1, ID_AA64ZFR0_AES_SHIFT, FTR_UNSIGNED, ID_AA64ZFR0_AES_PMULL, CAP_HWCAP, KERNEL_HWCAP_SVEPMULL), | |
2224 | HWCAP_CAP(SYS_ID_AA64ZFR0_EL1, ID_AA64ZFR0_BITPERM_SHIFT, FTR_UNSIGNED, ID_AA64ZFR0_BITPERM, CAP_HWCAP, KERNEL_HWCAP_SVEBITPERM), | |
d4209d8b | 2225 | HWCAP_CAP(SYS_ID_AA64ZFR0_EL1, ID_AA64ZFR0_BF16_SHIFT, FTR_UNSIGNED, ID_AA64ZFR0_BF16, CAP_HWCAP, KERNEL_HWCAP_SVEBF16), |
06a916fe DM |
2226 | HWCAP_CAP(SYS_ID_AA64ZFR0_EL1, ID_AA64ZFR0_SHA3_SHIFT, FTR_UNSIGNED, ID_AA64ZFR0_SHA3, CAP_HWCAP, KERNEL_HWCAP_SVESHA3), |
2227 | HWCAP_CAP(SYS_ID_AA64ZFR0_EL1, ID_AA64ZFR0_SM4_SHIFT, FTR_UNSIGNED, ID_AA64ZFR0_SM4, CAP_HWCAP, KERNEL_HWCAP_SVESM4), | |
d4209d8b SP |
2228 | HWCAP_CAP(SYS_ID_AA64ZFR0_EL1, ID_AA64ZFR0_I8MM_SHIFT, FTR_UNSIGNED, ID_AA64ZFR0_I8MM, CAP_HWCAP, KERNEL_HWCAP_SVEI8MM), |
2229 | HWCAP_CAP(SYS_ID_AA64ZFR0_EL1, ID_AA64ZFR0_F32MM_SHIFT, FTR_UNSIGNED, ID_AA64ZFR0_F32MM, CAP_HWCAP, KERNEL_HWCAP_SVEF32MM), | |
2230 | HWCAP_CAP(SYS_ID_AA64ZFR0_EL1, ID_AA64ZFR0_F64MM_SHIFT, FTR_UNSIGNED, ID_AA64ZFR0_F64MM, CAP_HWCAP, KERNEL_HWCAP_SVEF64MM), | |
43994d82 | 2231 | #endif |
aaba098f | 2232 | HWCAP_CAP(SYS_ID_AA64PFR1_EL1, ID_AA64PFR1_SSBS_SHIFT, FTR_UNSIGNED, ID_AA64PFR1_SSBS_PSTATE_INSNS, CAP_HWCAP, KERNEL_HWCAP_SSBS), |
8ef8f360 DM |
2233 | #ifdef CONFIG_ARM64_BTI |
2234 | HWCAP_CAP(SYS_ID_AA64PFR1_EL1, ID_AA64PFR1_BT_SHIFT, FTR_UNSIGNED, ID_AA64PFR1_BT_BTI, CAP_HWCAP, KERNEL_HWCAP_BTI), | |
2235 | #endif | |
75031975 | 2236 | #ifdef CONFIG_ARM64_PTR_AUTH |
aaba098f AM |
2237 | HWCAP_MULTI_CAP(ptr_auth_hwcap_addr_matches, CAP_HWCAP, KERNEL_HWCAP_PACA), |
2238 | HWCAP_MULTI_CAP(ptr_auth_hwcap_gen_matches, CAP_HWCAP, KERNEL_HWCAP_PACG), | |
75031975 | 2239 | #endif |
75283501 SP |
2240 | {}, |
2241 | }; | |
2242 | ||
7559950a SP |
2243 | #ifdef CONFIG_COMPAT |
2244 | static bool compat_has_neon(const struct arm64_cpu_capabilities *cap, int scope) | |
2245 | { | |
2246 | /* | |
2247 | * Check that all of MVFR1_EL1.{SIMDSP, SIMDInt, SIMDLS} are available, | |
2248 | * in line with that of arm32 as in vfp_init(). We make sure that the | |
2249 | * check is future proof, by making sure value is non-zero. | |
2250 | */ | |
2251 | u32 mvfr1; | |
2252 | ||
2253 | WARN_ON(scope == SCOPE_LOCAL_CPU && preemptible()); | |
2254 | if (scope == SCOPE_SYSTEM) | |
2255 | mvfr1 = read_sanitised_ftr_reg(SYS_MVFR1_EL1); | |
2256 | else | |
2257 | mvfr1 = read_sysreg_s(SYS_MVFR1_EL1); | |
2258 | ||
2259 | return cpuid_feature_extract_unsigned_field(mvfr1, MVFR1_SIMDSP_SHIFT) && | |
2260 | cpuid_feature_extract_unsigned_field(mvfr1, MVFR1_SIMDINT_SHIFT) && | |
2261 | cpuid_feature_extract_unsigned_field(mvfr1, MVFR1_SIMDLS_SHIFT); | |
2262 | } | |
2263 | #endif | |
2264 | ||
75283501 | 2265 | static const struct arm64_cpu_capabilities compat_elf_hwcaps[] = { |
37b01d53 | 2266 | #ifdef CONFIG_COMPAT |
7559950a SP |
2267 | HWCAP_CAP_MATCH(compat_has_neon, CAP_COMPAT_HWCAP, COMPAT_HWCAP_NEON), |
2268 | HWCAP_CAP(SYS_MVFR1_EL1, MVFR1_SIMDFMAC_SHIFT, FTR_UNSIGNED, 1, CAP_COMPAT_HWCAP, COMPAT_HWCAP_VFPv4), | |
2269 | /* Arm v8 mandates MVFR0.FPDP == {0, 2}. So, piggy back on this for the presence of VFP support */ | |
2270 | HWCAP_CAP(SYS_MVFR0_EL1, MVFR0_FPDP_SHIFT, FTR_UNSIGNED, 2, CAP_COMPAT_HWCAP, COMPAT_HWCAP_VFP), | |
2271 | HWCAP_CAP(SYS_MVFR0_EL1, MVFR0_FPDP_SHIFT, FTR_UNSIGNED, 2, CAP_COMPAT_HWCAP, COMPAT_HWCAP_VFPv3), | |
ff96f7bc SP |
2272 | HWCAP_CAP(SYS_ID_ISAR5_EL1, ID_ISAR5_AES_SHIFT, FTR_UNSIGNED, 2, CAP_COMPAT_HWCAP2, COMPAT_HWCAP2_PMULL), |
2273 | HWCAP_CAP(SYS_ID_ISAR5_EL1, ID_ISAR5_AES_SHIFT, FTR_UNSIGNED, 1, CAP_COMPAT_HWCAP2, COMPAT_HWCAP2_AES), | |
2274 | HWCAP_CAP(SYS_ID_ISAR5_EL1, ID_ISAR5_SHA1_SHIFT, FTR_UNSIGNED, 1, CAP_COMPAT_HWCAP2, COMPAT_HWCAP2_SHA1), | |
2275 | HWCAP_CAP(SYS_ID_ISAR5_EL1, ID_ISAR5_SHA2_SHIFT, FTR_UNSIGNED, 1, CAP_COMPAT_HWCAP2, COMPAT_HWCAP2_SHA2), | |
2276 | HWCAP_CAP(SYS_ID_ISAR5_EL1, ID_ISAR5_CRC32_SHIFT, FTR_UNSIGNED, 1, CAP_COMPAT_HWCAP2, COMPAT_HWCAP2_CRC32), | |
37b01d53 SP |
2277 | #endif |
2278 | {}, | |
2279 | }; | |
2280 | ||
f3efb675 | 2281 | static void __init cap_set_elf_hwcap(const struct arm64_cpu_capabilities *cap) |
37b01d53 SP |
2282 | { |
2283 | switch (cap->hwcap_type) { | |
2284 | case CAP_HWCAP: | |
aaba098f | 2285 | cpu_set_feature(cap->hwcap); |
37b01d53 SP |
2286 | break; |
2287 | #ifdef CONFIG_COMPAT | |
2288 | case CAP_COMPAT_HWCAP: | |
2289 | compat_elf_hwcap |= (u32)cap->hwcap; | |
2290 | break; | |
2291 | case CAP_COMPAT_HWCAP2: | |
2292 | compat_elf_hwcap2 |= (u32)cap->hwcap; | |
2293 | break; | |
2294 | #endif | |
2295 | default: | |
2296 | WARN_ON(1); | |
2297 | break; | |
2298 | } | |
2299 | } | |
2300 | ||
2301 | /* Check if we have a particular HWCAP enabled */ | |
f3efb675 | 2302 | static bool cpus_have_elf_hwcap(const struct arm64_cpu_capabilities *cap) |
37b01d53 SP |
2303 | { |
2304 | bool rc; | |
2305 | ||
2306 | switch (cap->hwcap_type) { | |
2307 | case CAP_HWCAP: | |
aaba098f | 2308 | rc = cpu_have_feature(cap->hwcap); |
37b01d53 SP |
2309 | break; |
2310 | #ifdef CONFIG_COMPAT | |
2311 | case CAP_COMPAT_HWCAP: | |
2312 | rc = (compat_elf_hwcap & (u32)cap->hwcap) != 0; | |
2313 | break; | |
2314 | case CAP_COMPAT_HWCAP2: | |
2315 | rc = (compat_elf_hwcap2 & (u32)cap->hwcap) != 0; | |
2316 | break; | |
2317 | #endif | |
2318 | default: | |
2319 | WARN_ON(1); | |
2320 | rc = false; | |
2321 | } | |
2322 | ||
2323 | return rc; | |
2324 | } | |
2325 | ||
75283501 | 2326 | static void __init setup_elf_hwcaps(const struct arm64_cpu_capabilities *hwcaps) |
37b01d53 | 2327 | { |
77c97b4e | 2328 | /* We support emulation of accesses to CPU ID feature registers */ |
aaba098f | 2329 | cpu_set_named_feature(CPUID); |
75283501 | 2330 | for (; hwcaps->matches; hwcaps++) |
143ba05d | 2331 | if (hwcaps->matches(hwcaps, cpucap_default_scope(hwcaps))) |
75283501 | 2332 | cap_set_elf_hwcap(hwcaps); |
37b01d53 SP |
2333 | } |
2334 | ||
606f8e7b | 2335 | static void update_cpu_capabilities(u16 scope_mask) |
67948af4 | 2336 | { |
606f8e7b | 2337 | int i; |
67948af4 SP |
2338 | const struct arm64_cpu_capabilities *caps; |
2339 | ||
cce360b5 | 2340 | scope_mask &= ARM64_CPUCAP_SCOPE_MASK; |
606f8e7b SP |
2341 | for (i = 0; i < ARM64_NCAPS; i++) { |
2342 | caps = cpu_hwcaps_ptrs[i]; | |
2343 | if (!caps || !(caps->type & scope_mask) || | |
2344 | cpus_have_cap(caps->capability) || | |
cce360b5 | 2345 | !caps->matches(caps, cpucap_default_scope(caps))) |
359b7064 MZ |
2346 | continue; |
2347 | ||
606f8e7b SP |
2348 | if (caps->desc) |
2349 | pr_info("detected: %s\n", caps->desc); | |
75283501 | 2350 | cpus_set_cap(caps->capability); |
0ceb0d56 DT |
2351 | |
2352 | if ((scope_mask & SCOPE_BOOT_CPU) && (caps->type & SCOPE_BOOT_CPU)) | |
2353 | set_bit(caps->capability, boot_capabilities); | |
359b7064 | 2354 | } |
ce8b602c SP |
2355 | } |
2356 | ||
0b587c84 SP |
2357 | /* |
2358 | * Enable all the available capabilities on this CPU. The capabilities | |
2359 | * with BOOT_CPU scope are handled separately and hence skipped here. | |
2360 | */ | |
2361 | static int cpu_enable_non_boot_scope_capabilities(void *__unused) | |
ed478b3f | 2362 | { |
0b587c84 SP |
2363 | int i; |
2364 | u16 non_boot_scope = SCOPE_ALL & ~SCOPE_BOOT_CPU; | |
ed478b3f | 2365 | |
0b587c84 SP |
2366 | for_each_available_cap(i) { |
2367 | const struct arm64_cpu_capabilities *cap = cpu_hwcaps_ptrs[i]; | |
2368 | ||
2369 | if (WARN_ON(!cap)) | |
2370 | continue; | |
c0cda3b8 | 2371 | |
0b587c84 SP |
2372 | if (!(cap->type & non_boot_scope)) |
2373 | continue; | |
2374 | ||
2375 | if (cap->cpu_enable) | |
2376 | cap->cpu_enable(cap); | |
2377 | } | |
c0cda3b8 DM |
2378 | return 0; |
2379 | } | |
2380 | ||
ce8b602c | 2381 | /* |
dbb4e152 SP |
2382 | * Run through the enabled capabilities and enable() it on all active |
2383 | * CPUs | |
ce8b602c | 2384 | */ |
0b587c84 | 2385 | static void __init enable_cpu_capabilities(u16 scope_mask) |
ce8b602c | 2386 | { |
0b587c84 SP |
2387 | int i; |
2388 | const struct arm64_cpu_capabilities *caps; | |
2389 | bool boot_scope; | |
2390 | ||
cce360b5 | 2391 | scope_mask &= ARM64_CPUCAP_SCOPE_MASK; |
0b587c84 | 2392 | boot_scope = !!(scope_mask & SCOPE_BOOT_CPU); |
63a1e1c9 | 2393 | |
0b587c84 SP |
2394 | for (i = 0; i < ARM64_NCAPS; i++) { |
2395 | unsigned int num; | |
2396 | ||
2397 | caps = cpu_hwcaps_ptrs[i]; | |
2398 | if (!caps || !(caps->type & scope_mask)) | |
2399 | continue; | |
2400 | num = caps->capability; | |
2401 | if (!cpus_have_cap(num)) | |
63a1e1c9 MR |
2402 | continue; |
2403 | ||
2404 | /* Ensure cpus_have_const_cap(num) works */ | |
2405 | static_branch_enable(&cpu_hwcap_keys[num]); | |
2406 | ||
0b587c84 | 2407 | if (boot_scope && caps->cpu_enable) |
2a6dcb2b | 2408 | /* |
fd9d63da SP |
2409 | * Capabilities with SCOPE_BOOT_CPU scope are finalised |
2410 | * before any secondary CPU boots. Thus, each secondary | |
2411 | * will enable the capability as appropriate via | |
2412 | * check_local_cpu_capabilities(). The only exception is | |
2413 | * the boot CPU, for which the capability must be | |
2414 | * enabled here. This approach avoids costly | |
2415 | * stop_machine() calls for this case. | |
2a6dcb2b | 2416 | */ |
0b587c84 | 2417 | caps->cpu_enable(caps); |
63a1e1c9 | 2418 | } |
dbb4e152 | 2419 | |
0b587c84 SP |
2420 | /* |
2421 | * For all non-boot scope capabilities, use stop_machine() | |
2422 | * as it schedules the work allowing us to modify PSTATE, | |
2423 | * instead of on_each_cpu() which uses an IPI, giving us a | |
2424 | * PSTATE that disappears when we return. | |
2425 | */ | |
2426 | if (!boot_scope) | |
2427 | stop_machine(cpu_enable_non_boot_scope_capabilities, | |
2428 | NULL, cpu_online_mask); | |
ed478b3f SP |
2429 | } |
2430 | ||
eaac4d83 SP |
2431 | /* |
2432 | * Run through the list of capabilities to check for conflicts. | |
2433 | * If the system has already detected a capability, take necessary | |
2434 | * action on this CPU. | |
eaac4d83 | 2435 | */ |
deeaac51 | 2436 | static void verify_local_cpu_caps(u16 scope_mask) |
eaac4d83 | 2437 | { |
606f8e7b | 2438 | int i; |
eaac4d83 | 2439 | bool cpu_has_cap, system_has_cap; |
606f8e7b | 2440 | const struct arm64_cpu_capabilities *caps; |
eaac4d83 | 2441 | |
cce360b5 SP |
2442 | scope_mask &= ARM64_CPUCAP_SCOPE_MASK; |
2443 | ||
606f8e7b SP |
2444 | for (i = 0; i < ARM64_NCAPS; i++) { |
2445 | caps = cpu_hwcaps_ptrs[i]; | |
2446 | if (!caps || !(caps->type & scope_mask)) | |
cce360b5 SP |
2447 | continue; |
2448 | ||
ba7d9233 | 2449 | cpu_has_cap = caps->matches(caps, SCOPE_LOCAL_CPU); |
eaac4d83 SP |
2450 | system_has_cap = cpus_have_cap(caps->capability); |
2451 | ||
2452 | if (system_has_cap) { | |
2453 | /* | |
2454 | * Check if the new CPU misses an advertised feature, | |
2455 | * which is not safe to miss. | |
2456 | */ | |
2457 | if (!cpu_has_cap && !cpucap_late_cpu_optional(caps)) | |
2458 | break; | |
2459 | /* | |
2460 | * We have to issue cpu_enable() irrespective of | |
2461 | * whether the CPU has it or not, as it is enabeld | |
2462 | * system wide. It is upto the call back to take | |
2463 | * appropriate action on this CPU. | |
2464 | */ | |
2465 | if (caps->cpu_enable) | |
2466 | caps->cpu_enable(caps); | |
2467 | } else { | |
2468 | /* | |
2469 | * Check if the CPU has this capability if it isn't | |
2470 | * safe to have when the system doesn't. | |
2471 | */ | |
2472 | if (cpu_has_cap && !cpucap_late_cpu_permitted(caps)) | |
2473 | break; | |
2474 | } | |
2475 | } | |
2476 | ||
606f8e7b | 2477 | if (i < ARM64_NCAPS) { |
eaac4d83 SP |
2478 | pr_crit("CPU%d: Detected conflict for capability %d (%s), System: %d, CPU: %d\n", |
2479 | smp_processor_id(), caps->capability, | |
2480 | caps->desc, system_has_cap, cpu_has_cap); | |
eaac4d83 | 2481 | |
deeaac51 KM |
2482 | if (cpucap_panic_on_conflict(caps)) |
2483 | cpu_panic_kernel(); | |
2484 | else | |
2485 | cpu_die_early(); | |
2486 | } | |
eaac4d83 SP |
2487 | } |
2488 | ||
dbb4e152 | 2489 | /* |
13f417f3 SP |
2490 | * Check for CPU features that are used in early boot |
2491 | * based on the Boot CPU value. | |
dbb4e152 | 2492 | */ |
13f417f3 | 2493 | static void check_early_cpu_features(void) |
dbb4e152 | 2494 | { |
13f417f3 | 2495 | verify_cpu_asid_bits(); |
deeaac51 KM |
2496 | |
2497 | verify_local_cpu_caps(SCOPE_BOOT_CPU); | |
dbb4e152 | 2498 | } |
1c076303 | 2499 | |
75283501 SP |
2500 | static void |
2501 | verify_local_elf_hwcaps(const struct arm64_cpu_capabilities *caps) | |
2502 | { | |
2503 | ||
92406f0c SP |
2504 | for (; caps->matches; caps++) |
2505 | if (cpus_have_elf_hwcap(caps) && !caps->matches(caps, SCOPE_LOCAL_CPU)) { | |
75283501 SP |
2506 | pr_crit("CPU%d: missing HWCAP: %s\n", |
2507 | smp_processor_id(), caps->desc); | |
2508 | cpu_die_early(); | |
2509 | } | |
75283501 SP |
2510 | } |
2511 | ||
2e0f2478 DM |
2512 | static void verify_sve_features(void) |
2513 | { | |
2514 | u64 safe_zcr = read_sanitised_ftr_reg(SYS_ZCR_EL1); | |
2515 | u64 zcr = read_zcr_features(); | |
2516 | ||
2517 | unsigned int safe_len = safe_zcr & ZCR_ELx_LEN_MASK; | |
2518 | unsigned int len = zcr & ZCR_ELx_LEN_MASK; | |
2519 | ||
2520 | if (len < safe_len || sve_verify_vq_map()) { | |
d06b76be | 2521 | pr_crit("CPU%d: SVE: vector length support mismatch\n", |
2e0f2478 DM |
2522 | smp_processor_id()); |
2523 | cpu_die_early(); | |
2524 | } | |
2525 | ||
2526 | /* Add checks on other ZCR bits here if necessary */ | |
2527 | } | |
2528 | ||
c73433fc AK |
2529 | static void verify_hyp_capabilities(void) |
2530 | { | |
2531 | u64 safe_mmfr1, mmfr0, mmfr1; | |
2532 | int parange, ipa_max; | |
2533 | unsigned int safe_vmid_bits, vmid_bits; | |
2534 | ||
2535 | if (!IS_ENABLED(CONFIG_KVM) || !IS_ENABLED(CONFIG_KVM_ARM_HOST)) | |
2536 | return; | |
2537 | ||
2538 | safe_mmfr1 = read_sanitised_ftr_reg(SYS_ID_AA64MMFR1_EL1); | |
2539 | mmfr0 = read_cpuid(ID_AA64MMFR0_EL1); | |
2540 | mmfr1 = read_cpuid(ID_AA64MMFR1_EL1); | |
2541 | ||
2542 | /* Verify VMID bits */ | |
2543 | safe_vmid_bits = get_vmid_bits(safe_mmfr1); | |
2544 | vmid_bits = get_vmid_bits(mmfr1); | |
2545 | if (vmid_bits < safe_vmid_bits) { | |
2546 | pr_crit("CPU%d: VMID width mismatch\n", smp_processor_id()); | |
2547 | cpu_die_early(); | |
2548 | } | |
2549 | ||
2550 | /* Verify IPA range */ | |
f73531f0 AK |
2551 | parange = cpuid_feature_extract_unsigned_field(mmfr0, |
2552 | ID_AA64MMFR0_PARANGE_SHIFT); | |
c73433fc AK |
2553 | ipa_max = id_aa64mmfr0_parange_to_phys_shift(parange); |
2554 | if (ipa_max < get_kvm_ipa_limit()) { | |
2555 | pr_crit("CPU%d: IPA range mismatch\n", smp_processor_id()); | |
2556 | cpu_die_early(); | |
2557 | } | |
2558 | } | |
1e89baed | 2559 | |
dbb4e152 SP |
2560 | /* |
2561 | * Run through the enabled system capabilities and enable() it on this CPU. | |
2562 | * The capabilities were decided based on the available CPUs at the boot time. | |
2563 | * Any new CPU should match the system wide status of the capability. If the | |
2564 | * new CPU doesn't have a capability which the system now has enabled, we | |
2565 | * cannot do anything to fix it up and could cause unexpected failures. So | |
2566 | * we park the CPU. | |
2567 | */ | |
c47a1900 | 2568 | static void verify_local_cpu_capabilities(void) |
dbb4e152 | 2569 | { |
fd9d63da SP |
2570 | /* |
2571 | * The capabilities with SCOPE_BOOT_CPU are checked from | |
2572 | * check_early_cpu_features(), as they need to be verified | |
2573 | * on all secondary CPUs. | |
2574 | */ | |
deeaac51 | 2575 | verify_local_cpu_caps(SCOPE_ALL & ~SCOPE_BOOT_CPU); |
ed478b3f | 2576 | |
c47a1900 | 2577 | verify_local_elf_hwcaps(arm64_elf_hwcaps); |
2e0f2478 | 2578 | |
c47a1900 SP |
2579 | if (system_supports_32bit_el0()) |
2580 | verify_local_elf_hwcaps(compat_elf_hwcaps); | |
2e0f2478 DM |
2581 | |
2582 | if (system_supports_sve()) | |
2583 | verify_sve_features(); | |
c73433fc AK |
2584 | |
2585 | if (is_hyp_mode_available()) | |
2586 | verify_hyp_capabilities(); | |
c47a1900 | 2587 | } |
dbb4e152 | 2588 | |
c47a1900 SP |
2589 | void check_local_cpu_capabilities(void) |
2590 | { | |
2591 | /* | |
2592 | * All secondary CPUs should conform to the early CPU features | |
2593 | * in use by the kernel based on boot CPU. | |
2594 | */ | |
13f417f3 SP |
2595 | check_early_cpu_features(); |
2596 | ||
dbb4e152 | 2597 | /* |
c47a1900 | 2598 | * If we haven't finalised the system capabilities, this CPU gets |
fbd890b9 | 2599 | * a chance to update the errata work arounds and local features. |
c47a1900 SP |
2600 | * Otherwise, this CPU should verify that it has all the system |
2601 | * advertised capabilities. | |
dbb4e152 | 2602 | */ |
b51c6ac2 | 2603 | if (!system_capabilities_finalized()) |
ed478b3f SP |
2604 | update_cpu_capabilities(SCOPE_LOCAL_CPU); |
2605 | else | |
c47a1900 | 2606 | verify_local_cpu_capabilities(); |
359b7064 MZ |
2607 | } |
2608 | ||
fd9d63da SP |
2609 | static void __init setup_boot_cpu_capabilities(void) |
2610 | { | |
2611 | /* Detect capabilities with either SCOPE_BOOT_CPU or SCOPE_LOCAL_CPU */ | |
2612 | update_cpu_capabilities(SCOPE_BOOT_CPU | SCOPE_LOCAL_CPU); | |
2613 | /* Enable the SCOPE_BOOT_CPU capabilities alone right away */ | |
2614 | enable_cpu_capabilities(SCOPE_BOOT_CPU); | |
2615 | } | |
2616 | ||
f7bfc14a | 2617 | bool this_cpu_has_cap(unsigned int n) |
8f413758 | 2618 | { |
f7bfc14a SP |
2619 | if (!WARN_ON(preemptible()) && n < ARM64_NCAPS) { |
2620 | const struct arm64_cpu_capabilities *cap = cpu_hwcaps_ptrs[n]; | |
2621 | ||
2622 | if (cap) | |
2623 | return cap->matches(cap, SCOPE_LOCAL_CPU); | |
2624 | } | |
2625 | ||
2626 | return false; | |
8f413758 MZ |
2627 | } |
2628 | ||
3ff047f6 ADK |
2629 | /* |
2630 | * This helper function is used in a narrow window when, | |
2631 | * - The system wide safe registers are set with all the SMP CPUs and, | |
2632 | * - The SYSTEM_FEATURE cpu_hwcaps may not have been set. | |
2633 | * In all other cases cpus_have_{const_}cap() should be used. | |
2634 | */ | |
2635 | static bool __system_matches_cap(unsigned int n) | |
2636 | { | |
2637 | if (n < ARM64_NCAPS) { | |
2638 | const struct arm64_cpu_capabilities *cap = cpu_hwcaps_ptrs[n]; | |
2639 | ||
2640 | if (cap) | |
2641 | return cap->matches(cap, SCOPE_SYSTEM); | |
2642 | } | |
2643 | return false; | |
2644 | } | |
2645 | ||
aec0bff7 AM |
2646 | void cpu_set_feature(unsigned int num) |
2647 | { | |
2648 | WARN_ON(num >= MAX_CPU_FEATURES); | |
2649 | elf_hwcap |= BIT(num); | |
2650 | } | |
2651 | EXPORT_SYMBOL_GPL(cpu_set_feature); | |
2652 | ||
2653 | bool cpu_have_feature(unsigned int num) | |
2654 | { | |
2655 | WARN_ON(num >= MAX_CPU_FEATURES); | |
2656 | return elf_hwcap & BIT(num); | |
2657 | } | |
2658 | EXPORT_SYMBOL_GPL(cpu_have_feature); | |
2659 | ||
2660 | unsigned long cpu_get_elf_hwcap(void) | |
2661 | { | |
2662 | /* | |
2663 | * We currently only populate the first 32 bits of AT_HWCAP. Please | |
2664 | * note that for userspace compatibility we guarantee that bits 62 | |
2665 | * and 63 will always be returned as 0. | |
2666 | */ | |
2667 | return lower_32_bits(elf_hwcap); | |
2668 | } | |
2669 | ||
2670 | unsigned long cpu_get_elf_hwcap2(void) | |
2671 | { | |
2672 | return upper_32_bits(elf_hwcap); | |
2673 | } | |
2674 | ||
ed478b3f SP |
2675 | static void __init setup_system_capabilities(void) |
2676 | { | |
2677 | /* | |
2678 | * We have finalised the system-wide safe feature | |
2679 | * registers, finalise the capabilities that depend | |
fd9d63da SP |
2680 | * on it. Also enable all the available capabilities, |
2681 | * that are not enabled already. | |
ed478b3f SP |
2682 | */ |
2683 | update_cpu_capabilities(SCOPE_SYSTEM); | |
fd9d63da | 2684 | enable_cpu_capabilities(SCOPE_ALL & ~SCOPE_BOOT_CPU); |
ed478b3f SP |
2685 | } |
2686 | ||
9cdf8ec4 | 2687 | void __init setup_cpu_features(void) |
359b7064 | 2688 | { |
9cdf8ec4 | 2689 | u32 cwg; |
9cdf8ec4 | 2690 | |
ed478b3f | 2691 | setup_system_capabilities(); |
75283501 | 2692 | setup_elf_hwcaps(arm64_elf_hwcaps); |
643d703d SP |
2693 | |
2694 | if (system_supports_32bit_el0()) | |
2695 | setup_elf_hwcaps(compat_elf_hwcaps); | |
dbb4e152 | 2696 | |
2e6f549f KC |
2697 | if (system_uses_ttbr0_pan()) |
2698 | pr_info("emulated: Privileged Access Never (PAN) using TTBR0_EL1 switching\n"); | |
2699 | ||
2e0f2478 | 2700 | sve_setup(); |
94b07c1f | 2701 | minsigstksz_setup(); |
2e0f2478 | 2702 | |
dbb4e152 | 2703 | /* Advertise that we have computed the system capabilities */ |
b51c6ac2 | 2704 | finalize_system_capabilities(); |
dbb4e152 | 2705 | |
9cdf8ec4 SP |
2706 | /* |
2707 | * Check for sane CTR_EL0.CWG value. | |
2708 | */ | |
2709 | cwg = cache_type_cwg(); | |
9cdf8ec4 | 2710 | if (!cwg) |
ebc7e21e CM |
2711 | pr_warn("No Cache Writeback Granule information, assuming %d\n", |
2712 | ARCH_DMA_MINALIGN); | |
359b7064 | 2713 | } |
70544196 JM |
2714 | |
2715 | static bool __maybe_unused | |
92406f0c | 2716 | cpufeature_pan_not_uao(const struct arm64_cpu_capabilities *entry, int __unused) |
70544196 | 2717 | { |
3ff047f6 | 2718 | return (__system_matches_cap(ARM64_HAS_PAN) && !__system_matches_cap(ARM64_HAS_UAO)); |
70544196 | 2719 | } |
77c97b4e | 2720 | |
5ffdfaed VM |
2721 | static void __maybe_unused cpu_enable_cnp(struct arm64_cpu_capabilities const *cap) |
2722 | { | |
2723 | cpu_replace_ttbr1(lm_alias(swapper_pg_dir)); | |
2724 | } | |
2725 | ||
77c97b4e SP |
2726 | /* |
2727 | * We emulate only the following system register space. | |
2728 | * Op0 = 0x3, CRn = 0x0, Op1 = 0x0, CRm = [0, 4 - 7] | |
2729 | * See Table C5-6 System instruction encodings for System register accesses, | |
2730 | * ARMv8 ARM(ARM DDI 0487A.f) for more details. | |
2731 | */ | |
2732 | static inline bool __attribute_const__ is_emulated(u32 id) | |
2733 | { | |
2734 | return (sys_reg_Op0(id) == 0x3 && | |
2735 | sys_reg_CRn(id) == 0x0 && | |
2736 | sys_reg_Op1(id) == 0x0 && | |
2737 | (sys_reg_CRm(id) == 0 || | |
2738 | ((sys_reg_CRm(id) >= 4) && (sys_reg_CRm(id) <= 7)))); | |
2739 | } | |
2740 | ||
2741 | /* | |
2742 | * With CRm == 0, reg should be one of : | |
2743 | * MIDR_EL1, MPIDR_EL1 or REVIDR_EL1. | |
2744 | */ | |
2745 | static inline int emulate_id_reg(u32 id, u64 *valp) | |
2746 | { | |
2747 | switch (id) { | |
2748 | case SYS_MIDR_EL1: | |
2749 | *valp = read_cpuid_id(); | |
2750 | break; | |
2751 | case SYS_MPIDR_EL1: | |
2752 | *valp = SYS_MPIDR_SAFE_VAL; | |
2753 | break; | |
2754 | case SYS_REVIDR_EL1: | |
2755 | /* IMPLEMENTATION DEFINED values are emulated with 0 */ | |
2756 | *valp = 0; | |
2757 | break; | |
2758 | default: | |
2759 | return -EINVAL; | |
2760 | } | |
2761 | ||
2762 | return 0; | |
2763 | } | |
2764 | ||
2765 | static int emulate_sys_reg(u32 id, u64 *valp) | |
2766 | { | |
2767 | struct arm64_ftr_reg *regp; | |
2768 | ||
2769 | if (!is_emulated(id)) | |
2770 | return -EINVAL; | |
2771 | ||
2772 | if (sys_reg_CRm(id) == 0) | |
2773 | return emulate_id_reg(id, valp); | |
2774 | ||
3577dd37 | 2775 | regp = get_arm64_ftr_reg_nowarn(id); |
77c97b4e SP |
2776 | if (regp) |
2777 | *valp = arm64_ftr_reg_user_value(regp); | |
2778 | else | |
2779 | /* | |
2780 | * The untracked registers are either IMPLEMENTATION DEFINED | |
2781 | * (e.g, ID_AFR0_EL1) or reserved RAZ. | |
2782 | */ | |
2783 | *valp = 0; | |
2784 | return 0; | |
2785 | } | |
2786 | ||
520ad988 | 2787 | int do_emulate_mrs(struct pt_regs *regs, u32 sys_reg, u32 rt) |
77c97b4e SP |
2788 | { |
2789 | int rc; | |
77c97b4e SP |
2790 | u64 val; |
2791 | ||
77c97b4e SP |
2792 | rc = emulate_sys_reg(sys_reg, &val); |
2793 | if (!rc) { | |
520ad988 | 2794 | pt_regs_write_reg(regs, rt, val); |
6436beee | 2795 | arm64_skip_faulting_instruction(regs, AARCH64_INSN_SIZE); |
77c97b4e | 2796 | } |
77c97b4e SP |
2797 | return rc; |
2798 | } | |
2799 | ||
520ad988 AK |
2800 | static int emulate_mrs(struct pt_regs *regs, u32 insn) |
2801 | { | |
2802 | u32 sys_reg, rt; | |
2803 | ||
2804 | /* | |
2805 | * sys_reg values are defined as used in mrs/msr instruction. | |
2806 | * shift the imm value to get the encoding. | |
2807 | */ | |
2808 | sys_reg = (u32)aarch64_insn_decode_immediate(AARCH64_INSN_IMM_16, insn) << 5; | |
2809 | rt = aarch64_insn_decode_register(AARCH64_INSN_REGTYPE_RT, insn); | |
2810 | return do_emulate_mrs(regs, sys_reg, rt); | |
2811 | } | |
2812 | ||
77c97b4e SP |
2813 | static struct undef_hook mrs_hook = { |
2814 | .instr_mask = 0xfff00000, | |
2815 | .instr_val = 0xd5300000, | |
d64567f6 | 2816 | .pstate_mask = PSR_AA32_MODE_MASK, |
77c97b4e SP |
2817 | .pstate_val = PSR_MODE_EL0t, |
2818 | .fn = emulate_mrs, | |
2819 | }; | |
2820 | ||
2821 | static int __init enable_mrs_emulation(void) | |
2822 | { | |
2823 | register_undef_hook(&mrs_hook); | |
2824 | return 0; | |
2825 | } | |
2826 | ||
c0d8832e | 2827 | core_initcall(enable_mrs_emulation); |
1b3ccf4b JL |
2828 | |
2829 | ssize_t cpu_show_meltdown(struct device *dev, struct device_attribute *attr, | |
2830 | char *buf) | |
2831 | { | |
2832 | if (__meltdown_safe) | |
2833 | return sprintf(buf, "Not affected\n"); | |
2834 | ||
2835 | if (arm64_kernel_unmapped_at_el0()) | |
2836 | return sprintf(buf, "Mitigation: PTI\n"); | |
2837 | ||
2838 | return sprintf(buf, "Vulnerable\n"); | |
2839 | } |