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staging: erofs: fix warning Comparison to bool
[linux/fpc-iii.git] / arch / arm64 / kernel / cpufeature.c
blobca27e08e3d8a7ea96fd209064e02efd05add7827
1 /*
2 * Contains CPU feature definitions
3 *
4 * Copyright (C) 2015 ARM Ltd.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
17 */
18
19 #define pr_fmt(fmt) "CPU features: " fmt
20
21 #include <linux/bsearch.h>
22 #include <linux/cpumask.h>
23 #include <linux/crash_dump.h>
24 #include <linux/sort.h>
25 #include <linux/stop_machine.h>
26 #include <linux/types.h>
27 #include <linux/mm.h>
28 #include <linux/cpu.h>
29 #include <asm/cpu.h>
30 #include <asm/cpufeature.h>
31 #include <asm/cpu_ops.h>
32 #include <asm/fpsimd.h>
33 #include <asm/mmu_context.h>
34 #include <asm/processor.h>
35 #include <asm/sysreg.h>
36 #include <asm/traps.h>
37 #include <asm/virt.h>
38
39 /* Kernel representation of AT_HWCAP and AT_HWCAP2 */
40 static unsigned long elf_hwcap __read_mostly;
41
42 #ifdef CONFIG_COMPAT
43 #define COMPAT_ELF_HWCAP_DEFAULT \
44 (COMPAT_HWCAP_HALF|COMPAT_HWCAP_THUMB|\
45 COMPAT_HWCAP_FAST_MULT|COMPAT_HWCAP_EDSP|\
46 COMPAT_HWCAP_TLS|COMPAT_HWCAP_VFP|\
47 COMPAT_HWCAP_VFPv3|COMPAT_HWCAP_VFPv4|\
48 COMPAT_HWCAP_NEON|COMPAT_HWCAP_IDIV|\
49 COMPAT_HWCAP_LPAE)
50 unsigned int compat_elf_hwcap __read_mostly = COMPAT_ELF_HWCAP_DEFAULT;
51 unsigned int compat_elf_hwcap2 __read_mostly;
52 #endif
53
54 DECLARE_BITMAP(cpu_hwcaps, ARM64_NCAPS);
55 EXPORT_SYMBOL(cpu_hwcaps);
56 static struct arm64_cpu_capabilities const __ro_after_init *cpu_hwcaps_ptrs[ARM64_NCAPS];
57
58 /* Need also bit for ARM64_CB_PATCH */
59 DECLARE_BITMAP(boot_capabilities, ARM64_NPATCHABLE);
60
61 /*
62 * Flag to indicate if we have computed the system wide
63 * capabilities based on the boot time active CPUs. This
64 * will be used to determine if a new booting CPU should
65 * go through the verification process to make sure that it
66 * supports the system capabilities, without using a hotplug
67 * notifier.
68 */
69 static bool sys_caps_initialised;
70
71 static inline void set_sys_caps_initialised(void)
72 {
73 sys_caps_initialised = true;
74 }
75
76 static int dump_cpu_hwcaps(struct notifier_block *self, unsigned long v, void *p)
77 {
78 /* file-wide pr_fmt adds "CPU features: " prefix */
79 pr_emerg("0x%*pb\n", ARM64_NCAPS, &cpu_hwcaps);
80 return 0;
81 }
82
83 static struct notifier_block cpu_hwcaps_notifier = {
84 .notifier_call = dump_cpu_hwcaps
85 };
86
87 static int __init register_cpu_hwcaps_dumper(void)
88 {
89 atomic_notifier_chain_register(&panic_notifier_list,
90 &cpu_hwcaps_notifier);
91 return 0;
92 }
93 __initcall(register_cpu_hwcaps_dumper);
94
95 DEFINE_STATIC_KEY_ARRAY_FALSE(cpu_hwcap_keys, ARM64_NCAPS);
96 EXPORT_SYMBOL(cpu_hwcap_keys);
97
98 #define __ARM64_FTR_BITS(SIGNED, VISIBLE, STRICT, TYPE, SHIFT, WIDTH, SAFE_VAL) \
99 { \
100 .sign = SIGNED, \
101 .visible = VISIBLE, \
102 .strict = STRICT, \
103 .type = TYPE, \
104 .shift = SHIFT, \
105 .width = WIDTH, \
106 .safe_val = SAFE_VAL, \
107 }
108
109 /* Define a feature with unsigned values */
110 #define ARM64_FTR_BITS(VISIBLE, STRICT, TYPE, SHIFT, WIDTH, SAFE_VAL) \
111 __ARM64_FTR_BITS(FTR_UNSIGNED, VISIBLE, STRICT, TYPE, SHIFT, WIDTH, SAFE_VAL)
112
113 /* Define a feature with a signed value */
114 #define S_ARM64_FTR_BITS(VISIBLE, STRICT, TYPE, SHIFT, WIDTH, SAFE_VAL) \
115 __ARM64_FTR_BITS(FTR_SIGNED, VISIBLE, STRICT, TYPE, SHIFT, WIDTH, SAFE_VAL)
116
117 #define ARM64_FTR_END \
118 { \
119 .width = 0, \
120 }
121
122 /* meta feature for alternatives */
123 static bool __maybe_unused
124 cpufeature_pan_not_uao(const struct arm64_cpu_capabilities *entry, int __unused);
125
126 static void cpu_enable_cnp(struct arm64_cpu_capabilities const *cap);
127
128 /*
129 * NOTE: Any changes to the visibility of features should be kept in
130 * sync with the documentation of the CPU feature register ABI.
131 */
132 static const struct arm64_ftr_bits ftr_id_aa64isar0[] = {
133 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_TS_SHIFT, 4, 0),
134 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_FHM_SHIFT, 4, 0),
135 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_DP_SHIFT, 4, 0),
136 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_SM4_SHIFT, 4, 0),
137 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_SM3_SHIFT, 4, 0),
138 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_SHA3_SHIFT, 4, 0),
139 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_RDM_SHIFT, 4, 0),
140 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_ATOMICS_SHIFT, 4, 0),
141 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_CRC32_SHIFT, 4, 0),
142 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_SHA2_SHIFT, 4, 0),
143 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_SHA1_SHIFT, 4, 0),
144 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_AES_SHIFT, 4, 0),
145 ARM64_FTR_END,
146 };
147
148 static const struct arm64_ftr_bits ftr_id_aa64isar1[] = {
149 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_SB_SHIFT, 4, 0),
150 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_PTR_AUTH),
151 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_GPI_SHIFT, 4, 0),
152 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_PTR_AUTH),
153 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_GPA_SHIFT, 4, 0),
154 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_LRCPC_SHIFT, 4, 0),
155 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_FCMA_SHIFT, 4, 0),
156 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_JSCVT_SHIFT, 4, 0),
157 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_PTR_AUTH),
158 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_API_SHIFT, 4, 0),
159 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_PTR_AUTH),
160 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_APA_SHIFT, 4, 0),
161 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_DPB_SHIFT, 4, 0),
162 ARM64_FTR_END,
163 };
164
165 static const struct arm64_ftr_bits ftr_id_aa64pfr0[] = {
166 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64PFR0_CSV3_SHIFT, 4, 0),
167 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64PFR0_CSV2_SHIFT, 4, 0),
168 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR0_DIT_SHIFT, 4, 0),
169 ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE),
170 FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR0_SVE_SHIFT, 4, 0),
171 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR0_RAS_SHIFT, 4, 0),
172 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR0_GIC_SHIFT, 4, 0),
173 S_ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR0_ASIMD_SHIFT, 4, ID_AA64PFR0_ASIMD_NI),
174 S_ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR0_FP_SHIFT, 4, ID_AA64PFR0_FP_NI),
175 /* Linux doesn't care about the EL3 */
176 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64PFR0_EL3_SHIFT, 4, 0),
177 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR0_EL2_SHIFT, 4, 0),
178 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR0_EL1_SHIFT, 4, ID_AA64PFR0_EL1_64BIT_ONLY),
179 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR0_EL0_SHIFT, 4, ID_AA64PFR0_EL0_64BIT_ONLY),
180 ARM64_FTR_END,
181 };
182
183 static const struct arm64_ftr_bits ftr_id_aa64pfr1[] = {
184 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR1_SSBS_SHIFT, 4, ID_AA64PFR1_SSBS_PSTATE_NI),
185 ARM64_FTR_END,
186 };
187
188 static const struct arm64_ftr_bits ftr_id_aa64zfr0[] = {
189 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_SM4_SHIFT, 4, 0),
190 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_SHA3_SHIFT, 4, 0),
191 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_BITPERM_SHIFT, 4, 0),
192 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_AES_SHIFT, 4, 0),
193 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_SVEVER_SHIFT, 4, 0),
194 ARM64_FTR_END,
195 };
196
197 static const struct arm64_ftr_bits ftr_id_aa64mmfr0[] = {
198 S_ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_TGRAN4_SHIFT, 4, ID_AA64MMFR0_TGRAN4_NI),
199 S_ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_TGRAN64_SHIFT, 4, ID_AA64MMFR0_TGRAN64_NI),
200 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_TGRAN16_SHIFT, 4, ID_AA64MMFR0_TGRAN16_NI),
201 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_BIGENDEL0_SHIFT, 4, 0),
202 /* Linux shouldn't care about secure memory */
203 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_SNSMEM_SHIFT, 4, 0),
204 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_BIGENDEL_SHIFT, 4, 0),
205 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_ASID_SHIFT, 4, 0),
206 /*
207 * Differing PARange is fine as long as all peripherals and memory are mapped
208 * within the minimum PARange of all CPUs
209 */
210 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_PARANGE_SHIFT, 4, 0),
211 ARM64_FTR_END,
212 };
213
214 static const struct arm64_ftr_bits ftr_id_aa64mmfr1[] = {
215 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_PAN_SHIFT, 4, 0),
216 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_LOR_SHIFT, 4, 0),
217 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_HPD_SHIFT, 4, 0),
218 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_VHE_SHIFT, 4, 0),
219 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_VMIDBITS_SHIFT, 4, 0),
220 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_HADBS_SHIFT, 4, 0),
221 ARM64_FTR_END,
222 };
223
224 static const struct arm64_ftr_bits ftr_id_aa64mmfr2[] = {
225 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_FWB_SHIFT, 4, 0),
226 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_AT_SHIFT, 4, 0),
227 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_LVA_SHIFT, 4, 0),
228 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_IESB_SHIFT, 4, 0),
229 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_LSM_SHIFT, 4, 0),
230 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_UAO_SHIFT, 4, 0),
231 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_CNP_SHIFT, 4, 0),
232 ARM64_FTR_END,
233 };
234
235 static const struct arm64_ftr_bits ftr_ctr[] = {
236 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_EXACT, 31, 1, 1), /* RES1 */
237 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, CTR_DIC_SHIFT, 1, 1),
238 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, CTR_IDC_SHIFT, 1, 1),
239 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_HIGHER_SAFE, CTR_CWG_SHIFT, 4, 0),
240 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_HIGHER_SAFE, CTR_ERG_SHIFT, 4, 0),
241 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, CTR_DMINLINE_SHIFT, 4, 1),
242 /*
243 * Linux can handle differing I-cache policies. Userspace JITs will
244 * make use of *minLine.
245 * If we have differing I-cache policies, report it as the weakest - VIPT.
246 */
247 ARM64_FTR_BITS(FTR_VISIBLE, FTR_NONSTRICT, FTR_EXACT, 14, 2, ICACHE_POLICY_VIPT), /* L1Ip */
248 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, CTR_IMINLINE_SHIFT, 4, 0),
249 ARM64_FTR_END,
250 };
251
252 struct arm64_ftr_reg arm64_ftr_reg_ctrel0 = {
253 .name = "SYS_CTR_EL0",
254 .ftr_bits = ftr_ctr
255 };
256
257 static const struct arm64_ftr_bits ftr_id_mmfr0[] = {
258 S_ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 28, 4, 0xf), /* InnerShr */
259 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 24, 4, 0), /* FCSE */
260 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, 20, 4, 0), /* AuxReg */
261 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 16, 4, 0), /* TCM */
262 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 12, 4, 0), /* ShareLvl */
263 S_ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 8, 4, 0xf), /* OuterShr */
264 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 4, 4, 0), /* PMSA */
265 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 0, 4, 0), /* VMSA */
266 ARM64_FTR_END,
267 };
268
269 static const struct arm64_ftr_bits ftr_id_aa64dfr0[] = {
270 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_EXACT, 36, 28, 0),
271 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64DFR0_PMSVER_SHIFT, 4, 0),
272 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64DFR0_CTX_CMPS_SHIFT, 4, 0),
273 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64DFR0_WRPS_SHIFT, 4, 0),
274 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64DFR0_BRPS_SHIFT, 4, 0),
275 /*
276 * We can instantiate multiple PMU instances with different levels
277 * of support.
278 */
279 S_ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_EXACT, ID_AA64DFR0_PMUVER_SHIFT, 4, 0),
280 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_EXACT, ID_AA64DFR0_TRACEVER_SHIFT, 4, 0),
281 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_EXACT, ID_AA64DFR0_DEBUGVER_SHIFT, 4, 0x6),
282 ARM64_FTR_END,
283 };
284
285 static const struct arm64_ftr_bits ftr_mvfr2[] = {
286 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 4, 4, 0), /* FPMisc */
287 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 0, 4, 0), /* SIMDMisc */
288 ARM64_FTR_END,
289 };
290
291 static const struct arm64_ftr_bits ftr_dczid[] = {
292 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_EXACT, 4, 1, 1), /* DZP */
293 ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, 0, 4, 0), /* BS */
294 ARM64_FTR_END,
295 };
296
297
298 static const struct arm64_ftr_bits ftr_id_isar5[] = {
299 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR5_RDM_SHIFT, 4, 0),
300 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR5_CRC32_SHIFT, 4, 0),
301 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR5_SHA2_SHIFT, 4, 0),
302 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR5_SHA1_SHIFT, 4, 0),
303 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR5_AES_SHIFT, 4, 0),
304 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR5_SEVL_SHIFT, 4, 0),
305 ARM64_FTR_END,
306 };
307
308 static const struct arm64_ftr_bits ftr_id_mmfr4[] = {
309 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 4, 4, 0), /* ac2 */
310 ARM64_FTR_END,
311 };
312
313 static const struct arm64_ftr_bits ftr_id_pfr0[] = {
314 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 12, 4, 0), /* State3 */
315 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 8, 4, 0), /* State2 */
316 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 4, 4, 0), /* State1 */
317 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 0, 4, 0), /* State0 */
318 ARM64_FTR_END,
319 };
320
321 static const struct arm64_ftr_bits ftr_id_dfr0[] = {
322 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 28, 4, 0),
323 S_ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 24, 4, 0xf), /* PerfMon */
324 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 20, 4, 0),
325 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 16, 4, 0),
326 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 12, 4, 0),
327 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 8, 4, 0),
328 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 4, 4, 0),
329 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 0, 4, 0),
330 ARM64_FTR_END,
331 };
332
333 static const struct arm64_ftr_bits ftr_zcr[] = {
334 ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE,
335 ZCR_ELx_LEN_SHIFT, ZCR_ELx_LEN_SIZE, 0), /* LEN */
336 ARM64_FTR_END,
337 };
338
339 /*
340 * Common ftr bits for a 32bit register with all hidden, strict
341 * attributes, with 4bit feature fields and a default safe value of
342 * 0. Covers the following 32bit registers:
343 * id_isar[0-4], id_mmfr[1-3], id_pfr1, mvfr[0-1]
344 */
345 static const struct arm64_ftr_bits ftr_generic_32bits[] = {
346 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 28, 4, 0),
347 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 24, 4, 0),
348 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 20, 4, 0),
349 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 16, 4, 0),
350 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 12, 4, 0),
351 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 8, 4, 0),
352 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 4, 4, 0),
353 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 0, 4, 0),
354 ARM64_FTR_END,
355 };
356
357 /* Table for a single 32bit feature value */
358 static const struct arm64_ftr_bits ftr_single32[] = {
359 ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_EXACT, 0, 32, 0),
360 ARM64_FTR_END,
361 };
362
363 static const struct arm64_ftr_bits ftr_raz[] = {
364 ARM64_FTR_END,
365 };
366
367 #define ARM64_FTR_REG(id, table) { \
368 .sys_id = id, \
369 .reg = &(struct arm64_ftr_reg){ \
370 .name = #id, \
371 .ftr_bits = &((table)[0]), \
372 }}
373
374 static const struct __ftr_reg_entry {
375 u32 sys_id;
376 struct arm64_ftr_reg *reg;
377 } arm64_ftr_regs[] = {
378
379 /* Op1 = 0, CRn = 0, CRm = 1 */
380 ARM64_FTR_REG(SYS_ID_PFR0_EL1, ftr_id_pfr0),
381 ARM64_FTR_REG(SYS_ID_PFR1_EL1, ftr_generic_32bits),
382 ARM64_FTR_REG(SYS_ID_DFR0_EL1, ftr_id_dfr0),
383 ARM64_FTR_REG(SYS_ID_MMFR0_EL1, ftr_id_mmfr0),
384 ARM64_FTR_REG(SYS_ID_MMFR1_EL1, ftr_generic_32bits),
385 ARM64_FTR_REG(SYS_ID_MMFR2_EL1, ftr_generic_32bits),
386 ARM64_FTR_REG(SYS_ID_MMFR3_EL1, ftr_generic_32bits),
387
388 /* Op1 = 0, CRn = 0, CRm = 2 */
389 ARM64_FTR_REG(SYS_ID_ISAR0_EL1, ftr_generic_32bits),
390 ARM64_FTR_REG(SYS_ID_ISAR1_EL1, ftr_generic_32bits),
391 ARM64_FTR_REG(SYS_ID_ISAR2_EL1, ftr_generic_32bits),
392 ARM64_FTR_REG(SYS_ID_ISAR3_EL1, ftr_generic_32bits),
393 ARM64_FTR_REG(SYS_ID_ISAR4_EL1, ftr_generic_32bits),
394 ARM64_FTR_REG(SYS_ID_ISAR5_EL1, ftr_id_isar5),
395 ARM64_FTR_REG(SYS_ID_MMFR4_EL1, ftr_id_mmfr4),
396
397 /* Op1 = 0, CRn = 0, CRm = 3 */
398 ARM64_FTR_REG(SYS_MVFR0_EL1, ftr_generic_32bits),
399 ARM64_FTR_REG(SYS_MVFR1_EL1, ftr_generic_32bits),
400 ARM64_FTR_REG(SYS_MVFR2_EL1, ftr_mvfr2),
401
402 /* Op1 = 0, CRn = 0, CRm = 4 */
403 ARM64_FTR_REG(SYS_ID_AA64PFR0_EL1, ftr_id_aa64pfr0),
404 ARM64_FTR_REG(SYS_ID_AA64PFR1_EL1, ftr_id_aa64pfr1),
405 ARM64_FTR_REG(SYS_ID_AA64ZFR0_EL1, ftr_id_aa64zfr0),
406
407 /* Op1 = 0, CRn = 0, CRm = 5 */
408 ARM64_FTR_REG(SYS_ID_AA64DFR0_EL1, ftr_id_aa64dfr0),
409 ARM64_FTR_REG(SYS_ID_AA64DFR1_EL1, ftr_raz),
410
411 /* Op1 = 0, CRn = 0, CRm = 6 */
412 ARM64_FTR_REG(SYS_ID_AA64ISAR0_EL1, ftr_id_aa64isar0),
413 ARM64_FTR_REG(SYS_ID_AA64ISAR1_EL1, ftr_id_aa64isar1),
414
415 /* Op1 = 0, CRn = 0, CRm = 7 */
416 ARM64_FTR_REG(SYS_ID_AA64MMFR0_EL1, ftr_id_aa64mmfr0),
417 ARM64_FTR_REG(SYS_ID_AA64MMFR1_EL1, ftr_id_aa64mmfr1),
418 ARM64_FTR_REG(SYS_ID_AA64MMFR2_EL1, ftr_id_aa64mmfr2),
419
420 /* Op1 = 0, CRn = 1, CRm = 2 */
421 ARM64_FTR_REG(SYS_ZCR_EL1, ftr_zcr),
422
423 /* Op1 = 3, CRn = 0, CRm = 0 */
424 { SYS_CTR_EL0, &arm64_ftr_reg_ctrel0 },
425 ARM64_FTR_REG(SYS_DCZID_EL0, ftr_dczid),
426
427 /* Op1 = 3, CRn = 14, CRm = 0 */
428 ARM64_FTR_REG(SYS_CNTFRQ_EL0, ftr_single32),
429 };
430
431 static int search_cmp_ftr_reg(const void *id, const void *regp)
432 {
433 return (int)(unsigned long)id - (int)((const struct __ftr_reg_entry *)regp)->sys_id;
434 }
435
436 /*
437 * get_arm64_ftr_reg - Lookup a feature register entry using its
438 * sys_reg() encoding. With the array arm64_ftr_regs sorted in the
439 * ascending order of sys_id , we use binary search to find a matching
440 * entry.
441 *
442 * returns - Upon success, matching ftr_reg entry for id.
443 * - NULL on failure. It is upto the caller to decide
444 * the impact of a failure.
445 */
446 static struct arm64_ftr_reg *get_arm64_ftr_reg(u32 sys_id)
447 {
448 const struct __ftr_reg_entry *ret;
449
450 ret = bsearch((const void *)(unsigned long)sys_id,
451 arm64_ftr_regs,
452 ARRAY_SIZE(arm64_ftr_regs),
453 sizeof(arm64_ftr_regs[0]),
454 search_cmp_ftr_reg);
455 if (ret)
456 return ret->reg;
457 return NULL;
458 }
459
460 static u64 arm64_ftr_set_value(const struct arm64_ftr_bits *ftrp, s64 reg,
461 s64 ftr_val)
462 {
463 u64 mask = arm64_ftr_mask(ftrp);
464
465 reg &= ~mask;
466 reg |= (ftr_val << ftrp->shift) & mask;
467 return reg;
468 }
469
470 static s64 arm64_ftr_safe_value(const struct arm64_ftr_bits *ftrp, s64 new,
471 s64 cur)
472 {
473 s64 ret = 0;
474
475 switch (ftrp->type) {
476 case FTR_EXACT:
477 ret = ftrp->safe_val;
478 break;
479 case FTR_LOWER_SAFE:
480 ret = new < cur ? new : cur;
481 break;
482 case FTR_HIGHER_SAFE:
483 ret = new > cur ? new : cur;
484 break;
485 default:
486 BUG();
487 }
488
489 return ret;
490 }
491
492 static void __init sort_ftr_regs(void)
493 {
494 int i;
495
496 /* Check that the array is sorted so that we can do the binary search */
497 for (i = 1; i < ARRAY_SIZE(arm64_ftr_regs); i++)
498 BUG_ON(arm64_ftr_regs[i].sys_id < arm64_ftr_regs[i - 1].sys_id);
499 }
500
501 /*
502 * Initialise the CPU feature register from Boot CPU values.
503 * Also initiliases the strict_mask for the register.
504 * Any bits that are not covered by an arm64_ftr_bits entry are considered
505 * RES0 for the system-wide value, and must strictly match.
506 */
507 static void __init init_cpu_ftr_reg(u32 sys_reg, u64 new)
508 {
509 u64 val = 0;
510 u64 strict_mask = ~0x0ULL;
511 u64 user_mask = 0;
512 u64 valid_mask = 0;
513
514 const struct arm64_ftr_bits *ftrp;
515 struct arm64_ftr_reg *reg = get_arm64_ftr_reg(sys_reg);
516
517 BUG_ON(!reg);
518
519 for (ftrp = reg->ftr_bits; ftrp->width; ftrp++) {
520 u64 ftr_mask = arm64_ftr_mask(ftrp);
521 s64 ftr_new = arm64_ftr_value(ftrp, new);
522
523 val = arm64_ftr_set_value(ftrp, val, ftr_new);
524
525 valid_mask |= ftr_mask;
526 if (!ftrp->strict)
527 strict_mask &= ~ftr_mask;
528 if (ftrp->visible)
529 user_mask |= ftr_mask;
530 else
531 reg->user_val = arm64_ftr_set_value(ftrp,
532 reg->user_val,
533 ftrp->safe_val);
534 }
535
536 val &= valid_mask;
537
538 reg->sys_val = val;
539 reg->strict_mask = strict_mask;
540 reg->user_mask = user_mask;
541 }
542
543 extern const struct arm64_cpu_capabilities arm64_errata[];
544 static const struct arm64_cpu_capabilities arm64_features[];
545
546 static void __init
547 init_cpu_hwcaps_indirect_list_from_array(const struct arm64_cpu_capabilities *caps)
548 {
549 for (; caps->matches; caps++) {
550 if (WARN(caps->capability >= ARM64_NCAPS,
551 "Invalid capability %d\n", caps->capability))
552 continue;
553 if (WARN(cpu_hwcaps_ptrs[caps->capability],
554 "Duplicate entry for capability %d\n",
555 caps->capability))
556 continue;
557 cpu_hwcaps_ptrs[caps->capability] = caps;
558 }
559 }
560
561 static void __init init_cpu_hwcaps_indirect_list(void)
562 {
563 init_cpu_hwcaps_indirect_list_from_array(arm64_features);
564 init_cpu_hwcaps_indirect_list_from_array(arm64_errata);
565 }
566
567 static void __init setup_boot_cpu_capabilities(void);
568
569 void __init init_cpu_features(struct cpuinfo_arm64 *info)
570 {
571 /* Before we start using the tables, make sure it is sorted */
572 sort_ftr_regs();
573
574 init_cpu_ftr_reg(SYS_CTR_EL0, info->reg_ctr);
575 init_cpu_ftr_reg(SYS_DCZID_EL0, info->reg_dczid);
576 init_cpu_ftr_reg(SYS_CNTFRQ_EL0, info->reg_cntfrq);
577 init_cpu_ftr_reg(SYS_ID_AA64DFR0_EL1, info->reg_id_aa64dfr0);
578 init_cpu_ftr_reg(SYS_ID_AA64DFR1_EL1, info->reg_id_aa64dfr1);
579 init_cpu_ftr_reg(SYS_ID_AA64ISAR0_EL1, info->reg_id_aa64isar0);
580 init_cpu_ftr_reg(SYS_ID_AA64ISAR1_EL1, info->reg_id_aa64isar1);
581 init_cpu_ftr_reg(SYS_ID_AA64MMFR0_EL1, info->reg_id_aa64mmfr0);
582 init_cpu_ftr_reg(SYS_ID_AA64MMFR1_EL1, info->reg_id_aa64mmfr1);
583 init_cpu_ftr_reg(SYS_ID_AA64MMFR2_EL1, info->reg_id_aa64mmfr2);
584 init_cpu_ftr_reg(SYS_ID_AA64PFR0_EL1, info->reg_id_aa64pfr0);
585 init_cpu_ftr_reg(SYS_ID_AA64PFR1_EL1, info->reg_id_aa64pfr1);
586 init_cpu_ftr_reg(SYS_ID_AA64ZFR0_EL1, info->reg_id_aa64zfr0);
587
588 if (id_aa64pfr0_32bit_el0(info->reg_id_aa64pfr0)) {
589 init_cpu_ftr_reg(SYS_ID_DFR0_EL1, info->reg_id_dfr0);
590 init_cpu_ftr_reg(SYS_ID_ISAR0_EL1, info->reg_id_isar0);
591 init_cpu_ftr_reg(SYS_ID_ISAR1_EL1, info->reg_id_isar1);
592 init_cpu_ftr_reg(SYS_ID_ISAR2_EL1, info->reg_id_isar2);
593 init_cpu_ftr_reg(SYS_ID_ISAR3_EL1, info->reg_id_isar3);
594 init_cpu_ftr_reg(SYS_ID_ISAR4_EL1, info->reg_id_isar4);
595 init_cpu_ftr_reg(SYS_ID_ISAR5_EL1, info->reg_id_isar5);
596 init_cpu_ftr_reg(SYS_ID_MMFR0_EL1, info->reg_id_mmfr0);
597 init_cpu_ftr_reg(SYS_ID_MMFR1_EL1, info->reg_id_mmfr1);
598 init_cpu_ftr_reg(SYS_ID_MMFR2_EL1, info->reg_id_mmfr2);
599 init_cpu_ftr_reg(SYS_ID_MMFR3_EL1, info->reg_id_mmfr3);
600 init_cpu_ftr_reg(SYS_ID_PFR0_EL1, info->reg_id_pfr0);
601 init_cpu_ftr_reg(SYS_ID_PFR1_EL1, info->reg_id_pfr1);
602 init_cpu_ftr_reg(SYS_MVFR0_EL1, info->reg_mvfr0);
603 init_cpu_ftr_reg(SYS_MVFR1_EL1, info->reg_mvfr1);
604 init_cpu_ftr_reg(SYS_MVFR2_EL1, info->reg_mvfr2);
605 }
606
607 if (id_aa64pfr0_sve(info->reg_id_aa64pfr0)) {
608 init_cpu_ftr_reg(SYS_ZCR_EL1, info->reg_zcr);
609 sve_init_vq_map();
610 }
611
612 /*
613 * Initialize the indirect array of CPU hwcaps capabilities pointers
614 * before we handle the boot CPU below.
615 */
616 init_cpu_hwcaps_indirect_list();
617
618 /*
619 * Detect and enable early CPU capabilities based on the boot CPU,
620 * after we have initialised the CPU feature infrastructure.
621 */
622 setup_boot_cpu_capabilities();
623 }
624
625 static void update_cpu_ftr_reg(struct arm64_ftr_reg *reg, u64 new)
626 {
627 const struct arm64_ftr_bits *ftrp;
628
629 for (ftrp = reg->ftr_bits; ftrp->width; ftrp++) {
630 s64 ftr_cur = arm64_ftr_value(ftrp, reg->sys_val);
631 s64 ftr_new = arm64_ftr_value(ftrp, new);
632
633 if (ftr_cur == ftr_new)
634 continue;
635 /* Find a safe value */
636 ftr_new = arm64_ftr_safe_value(ftrp, ftr_new, ftr_cur);
637 reg->sys_val = arm64_ftr_set_value(ftrp, reg->sys_val, ftr_new);
638 }
639
640 }
641
642 static int check_update_ftr_reg(u32 sys_id, int cpu, u64 val, u64 boot)
643 {
644 struct arm64_ftr_reg *regp = get_arm64_ftr_reg(sys_id);
645
646 BUG_ON(!regp);
647 update_cpu_ftr_reg(regp, val);
648 if ((boot & regp->strict_mask) == (val & regp->strict_mask))
649 return 0;
650 pr_warn("SANITY CHECK: Unexpected variation in %s. Boot CPU: %#016llx, CPU%d: %#016llx\n",
651 regp->name, boot, cpu, val);
652 return 1;
653 }
654
655 /*
656 * Update system wide CPU feature registers with the values from a
657 * non-boot CPU. Also performs SANITY checks to make sure that there
658 * aren't any insane variations from that of the boot CPU.
659 */
660 void update_cpu_features(int cpu,
661 struct cpuinfo_arm64 *info,
662 struct cpuinfo_arm64 *boot)
663 {
664 int taint = 0;
665
666 /*
667 * The kernel can handle differing I-cache policies, but otherwise
668 * caches should look identical. Userspace JITs will make use of
669 * *minLine.
670 */
671 taint |= check_update_ftr_reg(SYS_CTR_EL0, cpu,
672 info->reg_ctr, boot->reg_ctr);
673
674 /*
675 * Userspace may perform DC ZVA instructions. Mismatched block sizes
676 * could result in too much or too little memory being zeroed if a
677 * process is preempted and migrated between CPUs.
678 */
679 taint |= check_update_ftr_reg(SYS_DCZID_EL0, cpu,
680 info->reg_dczid, boot->reg_dczid);
681
682 /* If different, timekeeping will be broken (especially with KVM) */
683 taint |= check_update_ftr_reg(SYS_CNTFRQ_EL0, cpu,
684 info->reg_cntfrq, boot->reg_cntfrq);
685
686 /*
687 * The kernel uses self-hosted debug features and expects CPUs to
688 * support identical debug features. We presently need CTX_CMPs, WRPs,
689 * and BRPs to be identical.
690 * ID_AA64DFR1 is currently RES0.
691 */
692 taint |= check_update_ftr_reg(SYS_ID_AA64DFR0_EL1, cpu,
693 info->reg_id_aa64dfr0, boot->reg_id_aa64dfr0);
694 taint |= check_update_ftr_reg(SYS_ID_AA64DFR1_EL1, cpu,
695 info->reg_id_aa64dfr1, boot->reg_id_aa64dfr1);
696 /*
697 * Even in big.LITTLE, processors should be identical instruction-set
698 * wise.
699 */
700 taint |= check_update_ftr_reg(SYS_ID_AA64ISAR0_EL1, cpu,
701 info->reg_id_aa64isar0, boot->reg_id_aa64isar0);
702 taint |= check_update_ftr_reg(SYS_ID_AA64ISAR1_EL1, cpu,
703 info->reg_id_aa64isar1, boot->reg_id_aa64isar1);
704
705 /*
706 * Differing PARange support is fine as long as all peripherals and
707 * memory are mapped within the minimum PARange of all CPUs.
708 * Linux should not care about secure memory.
709 */
710 taint |= check_update_ftr_reg(SYS_ID_AA64MMFR0_EL1, cpu,
711 info->reg_id_aa64mmfr0, boot->reg_id_aa64mmfr0);
712 taint |= check_update_ftr_reg(SYS_ID_AA64MMFR1_EL1, cpu,
713 info->reg_id_aa64mmfr1, boot->reg_id_aa64mmfr1);
714 taint |= check_update_ftr_reg(SYS_ID_AA64MMFR2_EL1, cpu,
715 info->reg_id_aa64mmfr2, boot->reg_id_aa64mmfr2);
716
717 /*
718 * EL3 is not our concern.
719 */
720 taint |= check_update_ftr_reg(SYS_ID_AA64PFR0_EL1, cpu,
721 info->reg_id_aa64pfr0, boot->reg_id_aa64pfr0);
722 taint |= check_update_ftr_reg(SYS_ID_AA64PFR1_EL1, cpu,
723 info->reg_id_aa64pfr1, boot->reg_id_aa64pfr1);
724
725 taint |= check_update_ftr_reg(SYS_ID_AA64ZFR0_EL1, cpu,
726 info->reg_id_aa64zfr0, boot->reg_id_aa64zfr0);
727
728 /*
729 * If we have AArch32, we care about 32-bit features for compat.
730 * If the system doesn't support AArch32, don't update them.
731 */
732 if (id_aa64pfr0_32bit_el0(read_sanitised_ftr_reg(SYS_ID_AA64PFR0_EL1)) &&
733 id_aa64pfr0_32bit_el0(info->reg_id_aa64pfr0)) {
734
735 taint |= check_update_ftr_reg(SYS_ID_DFR0_EL1, cpu,
736 info->reg_id_dfr0, boot->reg_id_dfr0);
737 taint |= check_update_ftr_reg(SYS_ID_ISAR0_EL1, cpu,
738 info->reg_id_isar0, boot->reg_id_isar0);
739 taint |= check_update_ftr_reg(SYS_ID_ISAR1_EL1, cpu,
740 info->reg_id_isar1, boot->reg_id_isar1);
741 taint |= check_update_ftr_reg(SYS_ID_ISAR2_EL1, cpu,
742 info->reg_id_isar2, boot->reg_id_isar2);
743 taint |= check_update_ftr_reg(SYS_ID_ISAR3_EL1, cpu,
744 info->reg_id_isar3, boot->reg_id_isar3);
745 taint |= check_update_ftr_reg(SYS_ID_ISAR4_EL1, cpu,
746 info->reg_id_isar4, boot->reg_id_isar4);
747 taint |= check_update_ftr_reg(SYS_ID_ISAR5_EL1, cpu,
748 info->reg_id_isar5, boot->reg_id_isar5);
749
750 /*
751 * Regardless of the value of the AuxReg field, the AIFSR, ADFSR, and
752 * ACTLR formats could differ across CPUs and therefore would have to
753 * be trapped for virtualization anyway.
754 */
755 taint |= check_update_ftr_reg(SYS_ID_MMFR0_EL1, cpu,
756 info->reg_id_mmfr0, boot->reg_id_mmfr0);
757 taint |= check_update_ftr_reg(SYS_ID_MMFR1_EL1, cpu,
758 info->reg_id_mmfr1, boot->reg_id_mmfr1);
759 taint |= check_update_ftr_reg(SYS_ID_MMFR2_EL1, cpu,
760 info->reg_id_mmfr2, boot->reg_id_mmfr2);
761 taint |= check_update_ftr_reg(SYS_ID_MMFR3_EL1, cpu,
762 info->reg_id_mmfr3, boot->reg_id_mmfr3);
763 taint |= check_update_ftr_reg(SYS_ID_PFR0_EL1, cpu,
764 info->reg_id_pfr0, boot->reg_id_pfr0);
765 taint |= check_update_ftr_reg(SYS_ID_PFR1_EL1, cpu,
766 info->reg_id_pfr1, boot->reg_id_pfr1);
767 taint |= check_update_ftr_reg(SYS_MVFR0_EL1, cpu,
768 info->reg_mvfr0, boot->reg_mvfr0);
769 taint |= check_update_ftr_reg(SYS_MVFR1_EL1, cpu,
770 info->reg_mvfr1, boot->reg_mvfr1);
771 taint |= check_update_ftr_reg(SYS_MVFR2_EL1, cpu,
772 info->reg_mvfr2, boot->reg_mvfr2);
773 }
774
775 if (id_aa64pfr0_sve(info->reg_id_aa64pfr0)) {
776 taint |= check_update_ftr_reg(SYS_ZCR_EL1, cpu,
777 info->reg_zcr, boot->reg_zcr);
778
779 /* Probe vector lengths, unless we already gave up on SVE */
780 if (id_aa64pfr0_sve(read_sanitised_ftr_reg(SYS_ID_AA64PFR0_EL1)) &&
781 !sys_caps_initialised)
782 sve_update_vq_map();
783 }
784
785 /*
786 * Mismatched CPU features are a recipe for disaster. Don't even
787 * pretend to support them.
788 */
789 if (taint) {
790 pr_warn_once("Unsupported CPU feature variation detected.\n");
791 add_taint(TAINT_CPU_OUT_OF_SPEC, LOCKDEP_STILL_OK);
792 }
793 }
794
795 u64 read_sanitised_ftr_reg(u32 id)
796 {
797 struct arm64_ftr_reg *regp = get_arm64_ftr_reg(id);
798
799 /* We shouldn't get a request for an unsupported register */
800 BUG_ON(!regp);
801 return regp->sys_val;
802 }
803
804 #define read_sysreg_case(r) \
805 case r: return read_sysreg_s(r)
806
807 /*
808 * __read_sysreg_by_encoding() - Used by a STARTING cpu before cpuinfo is populated.
809 * Read the system register on the current CPU
810 */
811 static u64 __read_sysreg_by_encoding(u32 sys_id)
812 {
813 switch (sys_id) {
814 read_sysreg_case(SYS_ID_PFR0_EL1);
815 read_sysreg_case(SYS_ID_PFR1_EL1);
816 read_sysreg_case(SYS_ID_DFR0_EL1);
817 read_sysreg_case(SYS_ID_MMFR0_EL1);
818 read_sysreg_case(SYS_ID_MMFR1_EL1);
819 read_sysreg_case(SYS_ID_MMFR2_EL1);
820 read_sysreg_case(SYS_ID_MMFR3_EL1);
821 read_sysreg_case(SYS_ID_ISAR0_EL1);
822 read_sysreg_case(SYS_ID_ISAR1_EL1);
823 read_sysreg_case(SYS_ID_ISAR2_EL1);
824 read_sysreg_case(SYS_ID_ISAR3_EL1);
825 read_sysreg_case(SYS_ID_ISAR4_EL1);
826 read_sysreg_case(SYS_ID_ISAR5_EL1);
827 read_sysreg_case(SYS_MVFR0_EL1);
828 read_sysreg_case(SYS_MVFR1_EL1);
829 read_sysreg_case(SYS_MVFR2_EL1);
830
831 read_sysreg_case(SYS_ID_AA64PFR0_EL1);
832 read_sysreg_case(SYS_ID_AA64PFR1_EL1);
833 read_sysreg_case(SYS_ID_AA64DFR0_EL1);
834 read_sysreg_case(SYS_ID_AA64DFR1_EL1);
835 read_sysreg_case(SYS_ID_AA64MMFR0_EL1);
836 read_sysreg_case(SYS_ID_AA64MMFR1_EL1);
837 read_sysreg_case(SYS_ID_AA64MMFR2_EL1);
838 read_sysreg_case(SYS_ID_AA64ISAR0_EL1);
839 read_sysreg_case(SYS_ID_AA64ISAR1_EL1);
840
841 read_sysreg_case(SYS_CNTFRQ_EL0);
842 read_sysreg_case(SYS_CTR_EL0);
843 read_sysreg_case(SYS_DCZID_EL0);
844
845 default:
846 BUG();
847 return 0;
848 }
849 }
850
851 #include <linux/irqchip/arm-gic-v3.h>
852
853 static bool
854 feature_matches(u64 reg, const struct arm64_cpu_capabilities *entry)
855 {
856 int val = cpuid_feature_extract_field(reg, entry->field_pos, entry->sign);
857
858 return val >= entry->min_field_value;
859 }
860
861 static bool
862 has_cpuid_feature(const struct arm64_cpu_capabilities *entry, int scope)
863 {
864 u64 val;
865
866 WARN_ON(scope == SCOPE_LOCAL_CPU && preemptible());
867 if (scope == SCOPE_SYSTEM)
868 val = read_sanitised_ftr_reg(entry->sys_reg);
869 else
870 val = __read_sysreg_by_encoding(entry->sys_reg);
871
872 return feature_matches(val, entry);
873 }
874
875 static bool has_useable_gicv3_cpuif(const struct arm64_cpu_capabilities *entry, int scope)
876 {
877 bool has_sre;
878
879 if (!has_cpuid_feature(entry, scope))
880 return false;
881
882 has_sre = gic_enable_sre();
883 if (!has_sre)
884 pr_warn_once("%s present but disabled by higher exception level\n",
885 entry->desc);
886
887 return has_sre;
888 }
889
890 static bool has_no_hw_prefetch(const struct arm64_cpu_capabilities *entry, int __unused)
891 {
892 u32 midr = read_cpuid_id();
893
894 /* Cavium ThunderX pass 1.x and 2.x */
895 return MIDR_IS_CPU_MODEL_RANGE(midr, MIDR_THUNDERX,
896 MIDR_CPU_VAR_REV(0, 0),
897 MIDR_CPU_VAR_REV(1, MIDR_REVISION_MASK));
898 }
899
900 static bool has_no_fpsimd(const struct arm64_cpu_capabilities *entry, int __unused)
901 {
902 u64 pfr0 = read_sanitised_ftr_reg(SYS_ID_AA64PFR0_EL1);
903
904 return cpuid_feature_extract_signed_field(pfr0,
905 ID_AA64PFR0_FP_SHIFT) < 0;
906 }
907
908 static bool has_cache_idc(const struct arm64_cpu_capabilities *entry,
909 int scope)
910 {
911 u64 ctr;
912
913 if (scope == SCOPE_SYSTEM)
914 ctr = arm64_ftr_reg_ctrel0.sys_val;
915 else
916 ctr = read_cpuid_effective_cachetype();
917
918 return ctr & BIT(CTR_IDC_SHIFT);
919 }
920
921 static void cpu_emulate_effective_ctr(const struct arm64_cpu_capabilities *__unused)
922 {
923 /*
924 * If the CPU exposes raw CTR_EL0.IDC = 0, while effectively
925 * CTR_EL0.IDC = 1 (from CLIDR values), we need to trap accesses
926 * to the CTR_EL0 on this CPU and emulate it with the real/safe
927 * value.
928 */
929 if (!(read_cpuid_cachetype() & BIT(CTR_IDC_SHIFT)))
930 sysreg_clear_set(sctlr_el1, SCTLR_EL1_UCT, 0);
931 }
932
933 static bool has_cache_dic(const struct arm64_cpu_capabilities *entry,
934 int scope)
935 {
936 u64 ctr;
937
938 if (scope == SCOPE_SYSTEM)
939 ctr = arm64_ftr_reg_ctrel0.sys_val;
940 else
941 ctr = read_cpuid_cachetype();
942
943 return ctr & BIT(CTR_DIC_SHIFT);
944 }
945
946 static bool __maybe_unused
947 has_useable_cnp(const struct arm64_cpu_capabilities *entry, int scope)
948 {
949 /*
950 * Kdump isn't guaranteed to power-off all secondary CPUs, CNP
951 * may share TLB entries with a CPU stuck in the crashed
952 * kernel.
953 */
954 if (is_kdump_kernel())
955 return false;
956
957 return has_cpuid_feature(entry, scope);
958 }
959
960 static bool __meltdown_safe = true;
961 static int __kpti_forced; /* 0: not forced, >0: forced on, <0: forced off */
962
963 static bool unmap_kernel_at_el0(const struct arm64_cpu_capabilities *entry,
964 int scope)
965 {
966 /* List of CPUs that are not vulnerable and don't need KPTI */
967 static const struct midr_range kpti_safe_list[] = {
968 MIDR_ALL_VERSIONS(MIDR_CAVIUM_THUNDERX2),
969 MIDR_ALL_VERSIONS(MIDR_BRCM_VULCAN),
970 MIDR_ALL_VERSIONS(MIDR_CORTEX_A35),
971 MIDR_ALL_VERSIONS(MIDR_CORTEX_A53),
972 MIDR_ALL_VERSIONS(MIDR_CORTEX_A55),
973 MIDR_ALL_VERSIONS(MIDR_CORTEX_A57),
974 MIDR_ALL_VERSIONS(MIDR_CORTEX_A72),
975 MIDR_ALL_VERSIONS(MIDR_CORTEX_A73),
976 MIDR_ALL_VERSIONS(MIDR_HISI_TSV110),
977 { /* sentinel */ }
978 };
979 char const *str = "kpti command line option";
980 bool meltdown_safe;
981
982 meltdown_safe = is_midr_in_range_list(read_cpuid_id(), kpti_safe_list);
983
984 /* Defer to CPU feature registers */
985 if (has_cpuid_feature(entry, scope))
986 meltdown_safe = true;
987
988 if (!meltdown_safe)
989 __meltdown_safe = false;
990
991 /*
992 * For reasons that aren't entirely clear, enabling KPTI on Cavium
993 * ThunderX leads to apparent I-cache corruption of kernel text, which
994 * ends as well as you might imagine. Don't even try.
995 */
996 if (cpus_have_const_cap(ARM64_WORKAROUND_CAVIUM_27456)) {
997 str = "ARM64_WORKAROUND_CAVIUM_27456";
998 __kpti_forced = -1;
999 }
1000
1001 /* Useful for KASLR robustness */
1002 if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && kaslr_offset() > 0) {
1003 if (!__kpti_forced) {
1004 str = "KASLR";
1005 __kpti_forced = 1;
1006 }
1007 }
1008
1009 if (cpu_mitigations_off() && !__kpti_forced) {
1010 str = "mitigations=off";
1011 __kpti_forced = -1;
1012 }
1013
1014 if (!IS_ENABLED(CONFIG_UNMAP_KERNEL_AT_EL0)) {
1015 pr_info_once("kernel page table isolation disabled by kernel configuration\n");
1016 return false;
1017 }
1018
1019 /* Forced? */
1020 if (__kpti_forced) {
1021 pr_info_once("kernel page table isolation forced %s by %s\n",
1022 __kpti_forced > 0 ? "ON" : "OFF", str);
1023 return __kpti_forced > 0;
1024 }
1025
1026 return !meltdown_safe;
1027 }
1028
1029 #ifdef CONFIG_UNMAP_KERNEL_AT_EL0
1030 static void
1031 kpti_install_ng_mappings(const struct arm64_cpu_capabilities *__unused)
1032 {
1033 typedef void (kpti_remap_fn)(int, int, phys_addr_t);
1034 extern kpti_remap_fn idmap_kpti_install_ng_mappings;
1035 kpti_remap_fn *remap_fn;
1036
1037 static bool kpti_applied = false;
1038 int cpu = smp_processor_id();
1039
1040 /*
1041 * We don't need to rewrite the page-tables if either we've done
1042 * it already or we have KASLR enabled and therefore have not
1043 * created any global mappings at all.
1044 */
1045 if (kpti_applied || kaslr_offset() > 0)
1046 return;
1047
1048 remap_fn = (void *)__pa_symbol(idmap_kpti_install_ng_mappings);
1049
1050 cpu_install_idmap();
1051 remap_fn(cpu, num_online_cpus(), __pa_symbol(swapper_pg_dir));
1052 cpu_uninstall_idmap();
1053
1054 if (!cpu)
1055 kpti_applied = true;
1056
1057 return;
1058 }
1059 #else
1060 static void
1061 kpti_install_ng_mappings(const struct arm64_cpu_capabilities *__unused)
1062 {
1063 }
1064 #endif /* CONFIG_UNMAP_KERNEL_AT_EL0 */
1065
1066 static int __init parse_kpti(char *str)
1067 {
1068 bool enabled;
1069 int ret = strtobool(str, &enabled);
1070
1071 if (ret)
1072 return ret;
1073
1074 __kpti_forced = enabled ? 1 : -1;
1075 return 0;
1076 }
1077 early_param("kpti", parse_kpti);
1078
1079 #ifdef CONFIG_ARM64_HW_AFDBM
1080 static inline void __cpu_enable_hw_dbm(void)
1081 {
1082 u64 tcr = read_sysreg(tcr_el1) | TCR_HD;
1083
1084 write_sysreg(tcr, tcr_el1);
1085 isb();
1086 }
1087
1088 static bool cpu_has_broken_dbm(void)
1089 {
1090 /* List of CPUs which have broken DBM support. */
1091 static const struct midr_range cpus[] = {
1092 #ifdef CONFIG_ARM64_ERRATUM_1024718
1093 MIDR_RANGE(MIDR_CORTEX_A55, 0, 0, 1, 0), // A55 r0p0 -r1p0
1094 #endif
1095 {},
1096 };
1097
1098 return is_midr_in_range_list(read_cpuid_id(), cpus);
1099 }
1100
1101 static bool cpu_can_use_dbm(const struct arm64_cpu_capabilities *cap)
1102 {
1103 return has_cpuid_feature(cap, SCOPE_LOCAL_CPU) &&
1104 !cpu_has_broken_dbm();
1105 }
1106
1107 static void cpu_enable_hw_dbm(struct arm64_cpu_capabilities const *cap)
1108 {
1109 if (cpu_can_use_dbm(cap))
1110 __cpu_enable_hw_dbm();
1111 }
1112
1113 static bool has_hw_dbm(const struct arm64_cpu_capabilities *cap,
1114 int __unused)
1115 {
1116 static bool detected = false;
1117 /*
1118 * DBM is a non-conflicting feature. i.e, the kernel can safely
1119 * run a mix of CPUs with and without the feature. So, we
1120 * unconditionally enable the capability to allow any late CPU
1121 * to use the feature. We only enable the control bits on the
1122 * CPU, if it actually supports.
1123 *
1124 * We have to make sure we print the "feature" detection only
1125 * when at least one CPU actually uses it. So check if this CPU
1126 * can actually use it and print the message exactly once.
1127 *
1128 * This is safe as all CPUs (including secondary CPUs - due to the
1129 * LOCAL_CPU scope - and the hotplugged CPUs - via verification)
1130 * goes through the "matches" check exactly once. Also if a CPU
1131 * matches the criteria, it is guaranteed that the CPU will turn
1132 * the DBM on, as the capability is unconditionally enabled.
1133 */
1134 if (!detected && cpu_can_use_dbm(cap)) {
1135 detected = true;
1136 pr_info("detected: Hardware dirty bit management\n");
1137 }
1138
1139 return true;
1140 }
1141
1142 #endif
1143
1144 #ifdef CONFIG_ARM64_VHE
1145 static bool runs_at_el2(const struct arm64_cpu_capabilities *entry, int __unused)
1146 {
1147 return is_kernel_in_hyp_mode();
1148 }
1149
1150 static void cpu_copy_el2regs(const struct arm64_cpu_capabilities *__unused)
1151 {
1152 /*
1153 * Copy register values that aren't redirected by hardware.
1154 *
1155 * Before code patching, we only set tpidr_el1, all CPUs need to copy
1156 * this value to tpidr_el2 before we patch the code. Once we've done
1157 * that, freshly-onlined CPUs will set tpidr_el2, so we don't need to
1158 * do anything here.
1159 */
1160 if (!alternative_is_applied(ARM64_HAS_VIRT_HOST_EXTN))
1161 write_sysreg(read_sysreg(tpidr_el1), tpidr_el2);
1162 }
1163 #endif
1164
1165 static void cpu_has_fwb(const struct arm64_cpu_capabilities *__unused)
1166 {
1167 u64 val = read_sysreg_s(SYS_CLIDR_EL1);
1168
1169 /* Check that CLIDR_EL1.LOU{U,IS} are both 0 */
1170 WARN_ON(val & (7 << 27 | 7 << 21));
1171 }
1172
1173 #ifdef CONFIG_ARM64_SSBD
1174 static int ssbs_emulation_handler(struct pt_regs *regs, u32 instr)
1175 {
1176 if (user_mode(regs))
1177 return 1;
1178
1179 if (instr & BIT(PSTATE_Imm_shift))
1180 regs->pstate |= PSR_SSBS_BIT;
1181 else
1182 regs->pstate &= ~PSR_SSBS_BIT;
1183
1184 arm64_skip_faulting_instruction(regs, 4);
1185 return 0;
1186 }
1187
1188 static struct undef_hook ssbs_emulation_hook = {
1189 .instr_mask = ~(1U << PSTATE_Imm_shift),
1190 .instr_val = 0xd500401f | PSTATE_SSBS,
1191 .fn = ssbs_emulation_handler,
1192 };
1193
1194 static void cpu_enable_ssbs(const struct arm64_cpu_capabilities *__unused)
1195 {
1196 static bool undef_hook_registered = false;
1197 static DEFINE_SPINLOCK(hook_lock);
1198
1199 spin_lock(&hook_lock);
1200 if (!undef_hook_registered) {
1201 register_undef_hook(&ssbs_emulation_hook);
1202 undef_hook_registered = true;
1203 }
1204 spin_unlock(&hook_lock);
1205
1206 if (arm64_get_ssbd_state() == ARM64_SSBD_FORCE_DISABLE) {
1207 sysreg_clear_set(sctlr_el1, 0, SCTLR_ELx_DSSBS);
1208 arm64_set_ssbd_mitigation(false);
1209 } else {
1210 arm64_set_ssbd_mitigation(true);
1211 }
1212 }
1213 #endif /* CONFIG_ARM64_SSBD */
1214
1215 #ifdef CONFIG_ARM64_PAN
1216 static void cpu_enable_pan(const struct arm64_cpu_capabilities *__unused)
1217 {
1218 /*
1219 * We modify PSTATE. This won't work from irq context as the PSTATE
1220 * is discarded once we return from the exception.
1221 */
1222 WARN_ON_ONCE(in_interrupt());
1223
1224 sysreg_clear_set(sctlr_el1, SCTLR_EL1_SPAN, 0);
1225 asm(SET_PSTATE_PAN(1));
1226 }
1227 #endif /* CONFIG_ARM64_PAN */
1228
1229 #ifdef CONFIG_ARM64_RAS_EXTN
1230 static void cpu_clear_disr(const struct arm64_cpu_capabilities *__unused)
1231 {
1232 /* Firmware may have left a deferred SError in this register. */
1233 write_sysreg_s(0, SYS_DISR_EL1);
1234 }
1235 #endif /* CONFIG_ARM64_RAS_EXTN */
1236
1237 #ifdef CONFIG_ARM64_PTR_AUTH
1238 static void cpu_enable_address_auth(struct arm64_cpu_capabilities const *cap)
1239 {
1240 sysreg_clear_set(sctlr_el1, 0, SCTLR_ELx_ENIA | SCTLR_ELx_ENIB |
1241 SCTLR_ELx_ENDA | SCTLR_ELx_ENDB);
1242 }
1243 #endif /* CONFIG_ARM64_PTR_AUTH */
1244
1245 #ifdef CONFIG_ARM64_PSEUDO_NMI
1246 static bool enable_pseudo_nmi;
1247
1248 static int __init early_enable_pseudo_nmi(char *p)
1249 {
1250 return strtobool(p, &enable_pseudo_nmi);
1251 }
1252 early_param("irqchip.gicv3_pseudo_nmi", early_enable_pseudo_nmi);
1253
1254 static bool can_use_gic_priorities(const struct arm64_cpu_capabilities *entry,
1255 int scope)
1256 {
1257 return enable_pseudo_nmi && has_useable_gicv3_cpuif(entry, scope);
1258 }
1259 #endif
1260
1261 static const struct arm64_cpu_capabilities arm64_features[] = {
1262 {
1263 .desc = "GIC system register CPU interface",
1264 .capability = ARM64_HAS_SYSREG_GIC_CPUIF,
1265 .type = ARM64_CPUCAP_STRICT_BOOT_CPU_FEATURE,
1266 .matches = has_useable_gicv3_cpuif,
1267 .sys_reg = SYS_ID_AA64PFR0_EL1,
1268 .field_pos = ID_AA64PFR0_GIC_SHIFT,
1269 .sign = FTR_UNSIGNED,
1270 .min_field_value = 1,
1271 },
1272 #ifdef CONFIG_ARM64_PAN
1273 {
1274 .desc = "Privileged Access Never",
1275 .capability = ARM64_HAS_PAN,
1276 .type = ARM64_CPUCAP_SYSTEM_FEATURE,
1277 .matches = has_cpuid_feature,
1278 .sys_reg = SYS_ID_AA64MMFR1_EL1,
1279 .field_pos = ID_AA64MMFR1_PAN_SHIFT,
1280 .sign = FTR_UNSIGNED,
1281 .min_field_value = 1,
1282 .cpu_enable = cpu_enable_pan,
1283 },
1284 #endif /* CONFIG_ARM64_PAN */
1285 #if defined(CONFIG_AS_LSE) && defined(CONFIG_ARM64_LSE_ATOMICS)
1286 {
1287 .desc = "LSE atomic instructions",
1288 .capability = ARM64_HAS_LSE_ATOMICS,
1289 .type = ARM64_CPUCAP_SYSTEM_FEATURE,
1290 .matches = has_cpuid_feature,
1291 .sys_reg = SYS_ID_AA64ISAR0_EL1,
1292 .field_pos = ID_AA64ISAR0_ATOMICS_SHIFT,
1293 .sign = FTR_UNSIGNED,
1294 .min_field_value = 2,
1295 },
1296 #endif /* CONFIG_AS_LSE && CONFIG_ARM64_LSE_ATOMICS */
1297 {
1298 .desc = "Software prefetching using PRFM",
1299 .capability = ARM64_HAS_NO_HW_PREFETCH,
1300 .type = ARM64_CPUCAP_WEAK_LOCAL_CPU_FEATURE,
1301 .matches = has_no_hw_prefetch,
1302 },
1303 #ifdef CONFIG_ARM64_UAO
1304 {
1305 .desc = "User Access Override",
1306 .capability = ARM64_HAS_UAO,
1307 .type = ARM64_CPUCAP_SYSTEM_FEATURE,
1308 .matches = has_cpuid_feature,
1309 .sys_reg = SYS_ID_AA64MMFR2_EL1,
1310 .field_pos = ID_AA64MMFR2_UAO_SHIFT,
1311 .min_field_value = 1,
1312 /*
1313 * We rely on stop_machine() calling uao_thread_switch() to set
1314 * UAO immediately after patching.
1315 */
1316 },
1317 #endif /* CONFIG_ARM64_UAO */
1318 #ifdef CONFIG_ARM64_PAN
1319 {
1320 .capability = ARM64_ALT_PAN_NOT_UAO,
1321 .type = ARM64_CPUCAP_SYSTEM_FEATURE,
1322 .matches = cpufeature_pan_not_uao,
1323 },
1324 #endif /* CONFIG_ARM64_PAN */
1325 #ifdef CONFIG_ARM64_VHE
1326 {
1327 .desc = "Virtualization Host Extensions",
1328 .capability = ARM64_HAS_VIRT_HOST_EXTN,
1329 .type = ARM64_CPUCAP_STRICT_BOOT_CPU_FEATURE,
1330 .matches = runs_at_el2,
1331 .cpu_enable = cpu_copy_el2regs,
1332 },
1333 #endif /* CONFIG_ARM64_VHE */
1334 {
1335 .desc = "32-bit EL0 Support",
1336 .capability = ARM64_HAS_32BIT_EL0,
1337 .type = ARM64_CPUCAP_SYSTEM_FEATURE,
1338 .matches = has_cpuid_feature,
1339 .sys_reg = SYS_ID_AA64PFR0_EL1,
1340 .sign = FTR_UNSIGNED,
1341 .field_pos = ID_AA64PFR0_EL0_SHIFT,
1342 .min_field_value = ID_AA64PFR0_EL0_32BIT_64BIT,
1343 },
1344 {
1345 .desc = "Kernel page table isolation (KPTI)",
1346 .capability = ARM64_UNMAP_KERNEL_AT_EL0,
1347 .type = ARM64_CPUCAP_BOOT_RESTRICTED_CPU_LOCAL_FEATURE,
1348 /*
1349 * The ID feature fields below are used to indicate that
1350 * the CPU doesn't need KPTI. See unmap_kernel_at_el0 for
1351 * more details.
1352 */
1353 .sys_reg = SYS_ID_AA64PFR0_EL1,
1354 .field_pos = ID_AA64PFR0_CSV3_SHIFT,
1355 .min_field_value = 1,
1356 .matches = unmap_kernel_at_el0,
1357 .cpu_enable = kpti_install_ng_mappings,
1358 },
1359 {
1360 /* FP/SIMD is not implemented */
1361 .capability = ARM64_HAS_NO_FPSIMD,
1362 .type = ARM64_CPUCAP_SYSTEM_FEATURE,
1363 .min_field_value = 0,
1364 .matches = has_no_fpsimd,
1365 },
1366 #ifdef CONFIG_ARM64_PMEM
1367 {
1368 .desc = "Data cache clean to Point of Persistence",
1369 .capability = ARM64_HAS_DCPOP,
1370 .type = ARM64_CPUCAP_SYSTEM_FEATURE,
1371 .matches = has_cpuid_feature,
1372 .sys_reg = SYS_ID_AA64ISAR1_EL1,
1373 .field_pos = ID_AA64ISAR1_DPB_SHIFT,
1374 .min_field_value = 1,
1375 },
1376 {
1377 .desc = "Data cache clean to Point of Deep Persistence",
1378 .capability = ARM64_HAS_DCPODP,
1379 .type = ARM64_CPUCAP_SYSTEM_FEATURE,
1380 .matches = has_cpuid_feature,
1381 .sys_reg = SYS_ID_AA64ISAR1_EL1,
1382 .sign = FTR_UNSIGNED,
1383 .field_pos = ID_AA64ISAR1_DPB_SHIFT,
1384 .min_field_value = 2,
1385 },
1386 #endif
1387 #ifdef CONFIG_ARM64_SVE
1388 {
1389 .desc = "Scalable Vector Extension",
1390 .type = ARM64_CPUCAP_SYSTEM_FEATURE,
1391 .capability = ARM64_SVE,
1392 .sys_reg = SYS_ID_AA64PFR0_EL1,
1393 .sign = FTR_UNSIGNED,
1394 .field_pos = ID_AA64PFR0_SVE_SHIFT,
1395 .min_field_value = ID_AA64PFR0_SVE,
1396 .matches = has_cpuid_feature,
1397 .cpu_enable = sve_kernel_enable,
1398 },
1399 #endif /* CONFIG_ARM64_SVE */
1400 #ifdef CONFIG_ARM64_RAS_EXTN
1401 {
1402 .desc = "RAS Extension Support",
1403 .capability = ARM64_HAS_RAS_EXTN,
1404 .type = ARM64_CPUCAP_SYSTEM_FEATURE,
1405 .matches = has_cpuid_feature,
1406 .sys_reg = SYS_ID_AA64PFR0_EL1,
1407 .sign = FTR_UNSIGNED,
1408 .field_pos = ID_AA64PFR0_RAS_SHIFT,
1409 .min_field_value = ID_AA64PFR0_RAS_V1,
1410 .cpu_enable = cpu_clear_disr,
1411 },
1412 #endif /* CONFIG_ARM64_RAS_EXTN */
1413 {
1414 .desc = "Data cache clean to the PoU not required for I/D coherence",
1415 .capability = ARM64_HAS_CACHE_IDC,
1416 .type = ARM64_CPUCAP_SYSTEM_FEATURE,
1417 .matches = has_cache_idc,
1418 .cpu_enable = cpu_emulate_effective_ctr,
1419 },
1420 {
1421 .desc = "Instruction cache invalidation not required for I/D coherence",
1422 .capability = ARM64_HAS_CACHE_DIC,
1423 .type = ARM64_CPUCAP_SYSTEM_FEATURE,
1424 .matches = has_cache_dic,
1425 },
1426 {
1427 .desc = "Stage-2 Force Write-Back",
1428 .type = ARM64_CPUCAP_SYSTEM_FEATURE,
1429 .capability = ARM64_HAS_STAGE2_FWB,
1430 .sys_reg = SYS_ID_AA64MMFR2_EL1,
1431 .sign = FTR_UNSIGNED,
1432 .field_pos = ID_AA64MMFR2_FWB_SHIFT,
1433 .min_field_value = 1,
1434 .matches = has_cpuid_feature,
1435 .cpu_enable = cpu_has_fwb,
1436 },
1437 #ifdef CONFIG_ARM64_HW_AFDBM
1438 {
1439 /*
1440 * Since we turn this on always, we don't want the user to
1441 * think that the feature is available when it may not be.
1442 * So hide the description.
1443 *
1444 * .desc = "Hardware pagetable Dirty Bit Management",
1445 *
1446 */
1447 .type = ARM64_CPUCAP_WEAK_LOCAL_CPU_FEATURE,
1448 .capability = ARM64_HW_DBM,
1449 .sys_reg = SYS_ID_AA64MMFR1_EL1,
1450 .sign = FTR_UNSIGNED,
1451 .field_pos = ID_AA64MMFR1_HADBS_SHIFT,
1452 .min_field_value = 2,
1453 .matches = has_hw_dbm,
1454 .cpu_enable = cpu_enable_hw_dbm,
1455 },
1456 #endif
1457 {
1458 .desc = "CRC32 instructions",
1459 .capability = ARM64_HAS_CRC32,
1460 .type = ARM64_CPUCAP_SYSTEM_FEATURE,
1461 .matches = has_cpuid_feature,
1462 .sys_reg = SYS_ID_AA64ISAR0_EL1,
1463 .field_pos = ID_AA64ISAR0_CRC32_SHIFT,
1464 .min_field_value = 1,
1465 },
1466 #ifdef CONFIG_ARM64_SSBD
1467 {
1468 .desc = "Speculative Store Bypassing Safe (SSBS)",
1469 .capability = ARM64_SSBS,
1470 .type = ARM64_CPUCAP_WEAK_LOCAL_CPU_FEATURE,
1471 .matches = has_cpuid_feature,
1472 .sys_reg = SYS_ID_AA64PFR1_EL1,
1473 .field_pos = ID_AA64PFR1_SSBS_SHIFT,
1474 .sign = FTR_UNSIGNED,
1475 .min_field_value = ID_AA64PFR1_SSBS_PSTATE_ONLY,
1476 .cpu_enable = cpu_enable_ssbs,
1477 },
1478 #endif
1479 #ifdef CONFIG_ARM64_CNP
1480 {
1481 .desc = "Common not Private translations",
1482 .capability = ARM64_HAS_CNP,
1483 .type = ARM64_CPUCAP_SYSTEM_FEATURE,
1484 .matches = has_useable_cnp,
1485 .sys_reg = SYS_ID_AA64MMFR2_EL1,
1486 .sign = FTR_UNSIGNED,
1487 .field_pos = ID_AA64MMFR2_CNP_SHIFT,
1488 .min_field_value = 1,
1489 .cpu_enable = cpu_enable_cnp,
1490 },
1491 #endif
1492 {
1493 .desc = "Speculation barrier (SB)",
1494 .capability = ARM64_HAS_SB,
1495 .type = ARM64_CPUCAP_SYSTEM_FEATURE,
1496 .matches = has_cpuid_feature,
1497 .sys_reg = SYS_ID_AA64ISAR1_EL1,
1498 .field_pos = ID_AA64ISAR1_SB_SHIFT,
1499 .sign = FTR_UNSIGNED,
1500 .min_field_value = 1,
1501 },
1502 #ifdef CONFIG_ARM64_PTR_AUTH
1503 {
1504 .desc = "Address authentication (architected algorithm)",
1505 .capability = ARM64_HAS_ADDRESS_AUTH_ARCH,
1506 .type = ARM64_CPUCAP_SYSTEM_FEATURE,
1507 .sys_reg = SYS_ID_AA64ISAR1_EL1,
1508 .sign = FTR_UNSIGNED,
1509 .field_pos = ID_AA64ISAR1_APA_SHIFT,
1510 .min_field_value = ID_AA64ISAR1_APA_ARCHITECTED,
1511 .matches = has_cpuid_feature,
1512 .cpu_enable = cpu_enable_address_auth,
1513 },
1514 {
1515 .desc = "Address authentication (IMP DEF algorithm)",
1516 .capability = ARM64_HAS_ADDRESS_AUTH_IMP_DEF,
1517 .type = ARM64_CPUCAP_SYSTEM_FEATURE,
1518 .sys_reg = SYS_ID_AA64ISAR1_EL1,
1519 .sign = FTR_UNSIGNED,
1520 .field_pos = ID_AA64ISAR1_API_SHIFT,
1521 .min_field_value = ID_AA64ISAR1_API_IMP_DEF,
1522 .matches = has_cpuid_feature,
1523 .cpu_enable = cpu_enable_address_auth,
1524 },
1525 {
1526 .desc = "Generic authentication (architected algorithm)",
1527 .capability = ARM64_HAS_GENERIC_AUTH_ARCH,
1528 .type = ARM64_CPUCAP_SYSTEM_FEATURE,
1529 .sys_reg = SYS_ID_AA64ISAR1_EL1,
1530 .sign = FTR_UNSIGNED,
1531 .field_pos = ID_AA64ISAR1_GPA_SHIFT,
1532 .min_field_value = ID_AA64ISAR1_GPA_ARCHITECTED,
1533 .matches = has_cpuid_feature,
1534 },
1535 {
1536 .desc = "Generic authentication (IMP DEF algorithm)",
1537 .capability = ARM64_HAS_GENERIC_AUTH_IMP_DEF,
1538 .type = ARM64_CPUCAP_SYSTEM_FEATURE,
1539 .sys_reg = SYS_ID_AA64ISAR1_EL1,
1540 .sign = FTR_UNSIGNED,
1541 .field_pos = ID_AA64ISAR1_GPI_SHIFT,
1542 .min_field_value = ID_AA64ISAR1_GPI_IMP_DEF,
1543 .matches = has_cpuid_feature,
1544 },
1545 #endif /* CONFIG_ARM64_PTR_AUTH */
1546 #ifdef CONFIG_ARM64_PSEUDO_NMI
1547 {
1548 /*
1549 * Depends on having GICv3
1550 */
1551 .desc = "IRQ priority masking",
1552 .capability = ARM64_HAS_IRQ_PRIO_MASKING,
1553 .type = ARM64_CPUCAP_STRICT_BOOT_CPU_FEATURE,
1554 .matches = can_use_gic_priorities,
1555 .sys_reg = SYS_ID_AA64PFR0_EL1,
1556 .field_pos = ID_AA64PFR0_GIC_SHIFT,
1557 .sign = FTR_UNSIGNED,
1558 .min_field_value = 1,
1559 },
1560 #endif
1561 {},
1562 };
1563
1564 #define HWCAP_CPUID_MATCH(reg, field, s, min_value) \
1565 .matches = has_cpuid_feature, \
1566 .sys_reg = reg, \
1567 .field_pos = field, \
1568 .sign = s, \
1569 .min_field_value = min_value,
1570
1571 #define __HWCAP_CAP(name, cap_type, cap) \
1572 .desc = name, \
1573 .type = ARM64_CPUCAP_SYSTEM_FEATURE, \
1574 .hwcap_type = cap_type, \
1575 .hwcap = cap, \
1576
1577 #define HWCAP_CAP(reg, field, s, min_value, cap_type, cap) \
1578 { \
1579 __HWCAP_CAP(#cap, cap_type, cap) \
1580 HWCAP_CPUID_MATCH(reg, field, s, min_value) \
1581 }
1582
1583 #define HWCAP_MULTI_CAP(list, cap_type, cap) \
1584 { \
1585 __HWCAP_CAP(#cap, cap_type, cap) \
1586 .matches = cpucap_multi_entry_cap_matches, \
1587 .match_list = list, \
1588 }
1589
1590 #ifdef CONFIG_ARM64_PTR_AUTH
1591 static const struct arm64_cpu_capabilities ptr_auth_hwcap_addr_matches[] = {
1592 {
1593 HWCAP_CPUID_MATCH(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_APA_SHIFT,
1594 FTR_UNSIGNED, ID_AA64ISAR1_APA_ARCHITECTED)
1595 },
1596 {
1597 HWCAP_CPUID_MATCH(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_API_SHIFT,
1598 FTR_UNSIGNED, ID_AA64ISAR1_API_IMP_DEF)
1599 },
1600 {},
1601 };
1602
1603 static const struct arm64_cpu_capabilities ptr_auth_hwcap_gen_matches[] = {
1604 {
1605 HWCAP_CPUID_MATCH(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_GPA_SHIFT,
1606 FTR_UNSIGNED, ID_AA64ISAR1_GPA_ARCHITECTED)
1607 },
1608 {
1609 HWCAP_CPUID_MATCH(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_GPI_SHIFT,
1610 FTR_UNSIGNED, ID_AA64ISAR1_GPI_IMP_DEF)
1611 },
1612 {},
1613 };
1614 #endif
1615
1616 static const struct arm64_cpu_capabilities arm64_elf_hwcaps[] = {
1617 HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_AES_SHIFT, FTR_UNSIGNED, 2, CAP_HWCAP, KERNEL_HWCAP_PMULL),
1618 HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_AES_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_AES),
1619 HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_SHA1_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_SHA1),
1620 HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_SHA2_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_SHA2),
1621 HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_SHA2_SHIFT, FTR_UNSIGNED, 2, CAP_HWCAP, KERNEL_HWCAP_SHA512),
1622 HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_CRC32_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_CRC32),
1623 HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_ATOMICS_SHIFT, FTR_UNSIGNED, 2, CAP_HWCAP, KERNEL_HWCAP_ATOMICS),
1624 HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_RDM_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_ASIMDRDM),
1625 HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_SHA3_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_SHA3),
1626 HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_SM3_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_SM3),
1627 HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_SM4_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_SM4),
1628 HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_DP_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_ASIMDDP),
1629 HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_FHM_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_ASIMDFHM),
1630 HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_TS_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_FLAGM),
1631 HWCAP_CAP(SYS_ID_AA64PFR0_EL1, ID_AA64PFR0_FP_SHIFT, FTR_SIGNED, 0, CAP_HWCAP, KERNEL_HWCAP_FP),
1632 HWCAP_CAP(SYS_ID_AA64PFR0_EL1, ID_AA64PFR0_FP_SHIFT, FTR_SIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_FPHP),
1633 HWCAP_CAP(SYS_ID_AA64PFR0_EL1, ID_AA64PFR0_ASIMD_SHIFT, FTR_SIGNED, 0, CAP_HWCAP, KERNEL_HWCAP_ASIMD),
1634 HWCAP_CAP(SYS_ID_AA64PFR0_EL1, ID_AA64PFR0_ASIMD_SHIFT, FTR_SIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_ASIMDHP),
1635 HWCAP_CAP(SYS_ID_AA64PFR0_EL1, ID_AA64PFR0_DIT_SHIFT, FTR_SIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_DIT),
1636 HWCAP_CAP(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_DPB_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_DCPOP),
1637 HWCAP_CAP(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_DPB_SHIFT, FTR_UNSIGNED, 2, CAP_HWCAP, KERNEL_HWCAP_DCPODP),
1638 HWCAP_CAP(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_JSCVT_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_JSCVT),
1639 HWCAP_CAP(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_FCMA_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_FCMA),
1640 HWCAP_CAP(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_LRCPC_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_LRCPC),
1641 HWCAP_CAP(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_LRCPC_SHIFT, FTR_UNSIGNED, 2, CAP_HWCAP, KERNEL_HWCAP_ILRCPC),
1642 HWCAP_CAP(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_SB_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_SB),
1643 HWCAP_CAP(SYS_ID_AA64MMFR2_EL1, ID_AA64MMFR2_AT_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_USCAT),
1644 #ifdef CONFIG_ARM64_SVE
1645 HWCAP_CAP(SYS_ID_AA64PFR0_EL1, ID_AA64PFR0_SVE_SHIFT, FTR_UNSIGNED, ID_AA64PFR0_SVE, CAP_HWCAP, KERNEL_HWCAP_SVE),
1646 HWCAP_CAP(SYS_ID_AA64ZFR0_EL1, ID_AA64ZFR0_SVEVER_SHIFT, FTR_UNSIGNED, ID_AA64ZFR0_SVEVER_SVE2, CAP_HWCAP, KERNEL_HWCAP_SVE2),
1647 HWCAP_CAP(SYS_ID_AA64ZFR0_EL1, ID_AA64ZFR0_AES_SHIFT, FTR_UNSIGNED, ID_AA64ZFR0_AES, CAP_HWCAP, KERNEL_HWCAP_SVEAES),
1648 HWCAP_CAP(SYS_ID_AA64ZFR0_EL1, ID_AA64ZFR0_AES_SHIFT, FTR_UNSIGNED, ID_AA64ZFR0_AES_PMULL, CAP_HWCAP, KERNEL_HWCAP_SVEPMULL),
1649 HWCAP_CAP(SYS_ID_AA64ZFR0_EL1, ID_AA64ZFR0_BITPERM_SHIFT, FTR_UNSIGNED, ID_AA64ZFR0_BITPERM, CAP_HWCAP, KERNEL_HWCAP_SVEBITPERM),
1650 HWCAP_CAP(SYS_ID_AA64ZFR0_EL1, ID_AA64ZFR0_SHA3_SHIFT, FTR_UNSIGNED, ID_AA64ZFR0_SHA3, CAP_HWCAP, KERNEL_HWCAP_SVESHA3),
1651 HWCAP_CAP(SYS_ID_AA64ZFR0_EL1, ID_AA64ZFR0_SM4_SHIFT, FTR_UNSIGNED, ID_AA64ZFR0_SM4, CAP_HWCAP, KERNEL_HWCAP_SVESM4),
1652 #endif
1653 HWCAP_CAP(SYS_ID_AA64PFR1_EL1, ID_AA64PFR1_SSBS_SHIFT, FTR_UNSIGNED, ID_AA64PFR1_SSBS_PSTATE_INSNS, CAP_HWCAP, KERNEL_HWCAP_SSBS),
1654 #ifdef CONFIG_ARM64_PTR_AUTH
1655 HWCAP_MULTI_CAP(ptr_auth_hwcap_addr_matches, CAP_HWCAP, KERNEL_HWCAP_PACA),
1656 HWCAP_MULTI_CAP(ptr_auth_hwcap_gen_matches, CAP_HWCAP, KERNEL_HWCAP_PACG),
1657 #endif
1658 {},
1659 };
1660
1661 static const struct arm64_cpu_capabilities compat_elf_hwcaps[] = {
1662 #ifdef CONFIG_COMPAT
1663 HWCAP_CAP(SYS_ID_ISAR5_EL1, ID_ISAR5_AES_SHIFT, FTR_UNSIGNED, 2, CAP_COMPAT_HWCAP2, COMPAT_HWCAP2_PMULL),
1664 HWCAP_CAP(SYS_ID_ISAR5_EL1, ID_ISAR5_AES_SHIFT, FTR_UNSIGNED, 1, CAP_COMPAT_HWCAP2, COMPAT_HWCAP2_AES),
1665 HWCAP_CAP(SYS_ID_ISAR5_EL1, ID_ISAR5_SHA1_SHIFT, FTR_UNSIGNED, 1, CAP_COMPAT_HWCAP2, COMPAT_HWCAP2_SHA1),
1666 HWCAP_CAP(SYS_ID_ISAR5_EL1, ID_ISAR5_SHA2_SHIFT, FTR_UNSIGNED, 1, CAP_COMPAT_HWCAP2, COMPAT_HWCAP2_SHA2),
1667 HWCAP_CAP(SYS_ID_ISAR5_EL1, ID_ISAR5_CRC32_SHIFT, FTR_UNSIGNED, 1, CAP_COMPAT_HWCAP2, COMPAT_HWCAP2_CRC32),
1668 #endif
1669 {},
1670 };
1671
1672 static void __init cap_set_elf_hwcap(const struct arm64_cpu_capabilities *cap)
1673 {
1674 switch (cap->hwcap_type) {
1675 case CAP_HWCAP:
1676 cpu_set_feature(cap->hwcap);
1677 break;
1678 #ifdef CONFIG_COMPAT
1679 case CAP_COMPAT_HWCAP:
1680 compat_elf_hwcap |= (u32)cap->hwcap;
1681 break;
1682 case CAP_COMPAT_HWCAP2:
1683 compat_elf_hwcap2 |= (u32)cap->hwcap;
1684 break;
1685 #endif
1686 default:
1687 WARN_ON(1);
1688 break;
1689 }
1690 }
1691
1692 /* Check if we have a particular HWCAP enabled */
1693 static bool cpus_have_elf_hwcap(const struct arm64_cpu_capabilities *cap)
1694 {
1695 bool rc;
1696
1697 switch (cap->hwcap_type) {
1698 case CAP_HWCAP:
1699 rc = cpu_have_feature(cap->hwcap);
1700 break;
1701 #ifdef CONFIG_COMPAT
1702 case CAP_COMPAT_HWCAP:
1703 rc = (compat_elf_hwcap & (u32)cap->hwcap) != 0;
1704 break;
1705 case CAP_COMPAT_HWCAP2:
1706 rc = (compat_elf_hwcap2 & (u32)cap->hwcap) != 0;
1707 break;
1708 #endif
1709 default:
1710 WARN_ON(1);
1711 rc = false;
1712 }
1713
1714 return rc;
1715 }
1716
1717 static void __init setup_elf_hwcaps(const struct arm64_cpu_capabilities *hwcaps)
1718 {
1719 /* We support emulation of accesses to CPU ID feature registers */
1720 cpu_set_named_feature(CPUID);
1721 for (; hwcaps->matches; hwcaps++)
1722 if (hwcaps->matches(hwcaps, cpucap_default_scope(hwcaps)))
1723 cap_set_elf_hwcap(hwcaps);
1724 }
1725
1726 static void update_cpu_capabilities(u16 scope_mask)
1727 {
1728 int i;
1729 const struct arm64_cpu_capabilities *caps;
1730
1731 scope_mask &= ARM64_CPUCAP_SCOPE_MASK;
1732 for (i = 0; i < ARM64_NCAPS; i++) {
1733 caps = cpu_hwcaps_ptrs[i];
1734 if (!caps || !(caps->type & scope_mask) ||
1735 cpus_have_cap(caps->capability) ||
1736 !caps->matches(caps, cpucap_default_scope(caps)))
1737 continue;
1738
1739 if (caps->desc)
1740 pr_info("detected: %s\n", caps->desc);
1741 cpus_set_cap(caps->capability);
1742
1743 if ((scope_mask & SCOPE_BOOT_CPU) && (caps->type & SCOPE_BOOT_CPU))
1744 set_bit(caps->capability, boot_capabilities);
1745 }
1746 }
1747
1748 /*
1749 * Enable all the available capabilities on this CPU. The capabilities
1750 * with BOOT_CPU scope are handled separately and hence skipped here.
1751 */
1752 static int cpu_enable_non_boot_scope_capabilities(void *__unused)
1753 {
1754 int i;
1755 u16 non_boot_scope = SCOPE_ALL & ~SCOPE_BOOT_CPU;
1756
1757 for_each_available_cap(i) {
1758 const struct arm64_cpu_capabilities *cap = cpu_hwcaps_ptrs[i];
1759
1760 if (WARN_ON(!cap))
1761 continue;
1762
1763 if (!(cap->type & non_boot_scope))
1764 continue;
1765
1766 if (cap->cpu_enable)
1767 cap->cpu_enable(cap);
1768 }
1769 return 0;
1770 }
1771
1772 /*
1773 * Run through the enabled capabilities and enable() it on all active
1774 * CPUs
1775 */
1776 static void __init enable_cpu_capabilities(u16 scope_mask)
1777 {
1778 int i;
1779 const struct arm64_cpu_capabilities *caps;
1780 bool boot_scope;
1781
1782 scope_mask &= ARM64_CPUCAP_SCOPE_MASK;
1783 boot_scope = !!(scope_mask & SCOPE_BOOT_CPU);
1784
1785 for (i = 0; i < ARM64_NCAPS; i++) {
1786 unsigned int num;
1787
1788 caps = cpu_hwcaps_ptrs[i];
1789 if (!caps || !(caps->type & scope_mask))
1790 continue;
1791 num = caps->capability;
1792 if (!cpus_have_cap(num))
1793 continue;
1794
1795 /* Ensure cpus_have_const_cap(num) works */
1796 static_branch_enable(&cpu_hwcap_keys[num]);
1797
1798 if (boot_scope && caps->cpu_enable)
1799 /*
1800 * Capabilities with SCOPE_BOOT_CPU scope are finalised
1801 * before any secondary CPU boots. Thus, each secondary
1802 * will enable the capability as appropriate via
1803 * check_local_cpu_capabilities(). The only exception is
1804 * the boot CPU, for which the capability must be
1805 * enabled here. This approach avoids costly
1806 * stop_machine() calls for this case.
1807 */
1808 caps->cpu_enable(caps);
1809 }
1810
1811 /*
1812 * For all non-boot scope capabilities, use stop_machine()
1813 * as it schedules the work allowing us to modify PSTATE,
1814 * instead of on_each_cpu() which uses an IPI, giving us a
1815 * PSTATE that disappears when we return.
1816 */
1817 if (!boot_scope)
1818 stop_machine(cpu_enable_non_boot_scope_capabilities,
1819 NULL, cpu_online_mask);
1820 }
1821
1822 /*
1823 * Run through the list of capabilities to check for conflicts.
1824 * If the system has already detected a capability, take necessary
1825 * action on this CPU.
1826 *
1827 * Returns "false" on conflicts.
1828 */
1829 static bool verify_local_cpu_caps(u16 scope_mask)
1830 {
1831 int i;
1832 bool cpu_has_cap, system_has_cap;
1833 const struct arm64_cpu_capabilities *caps;
1834
1835 scope_mask &= ARM64_CPUCAP_SCOPE_MASK;
1836
1837 for (i = 0; i < ARM64_NCAPS; i++) {
1838 caps = cpu_hwcaps_ptrs[i];
1839 if (!caps || !(caps->type & scope_mask))
1840 continue;
1841
1842 cpu_has_cap = caps->matches(caps, SCOPE_LOCAL_CPU);
1843 system_has_cap = cpus_have_cap(caps->capability);
1844
1845 if (system_has_cap) {
1846 /*
1847 * Check if the new CPU misses an advertised feature,
1848 * which is not safe to miss.
1849 */
1850 if (!cpu_has_cap && !cpucap_late_cpu_optional(caps))
1851 break;
1852 /*
1853 * We have to issue cpu_enable() irrespective of
1854 * whether the CPU has it or not, as it is enabeld
1855 * system wide. It is upto the call back to take
1856 * appropriate action on this CPU.
1857 */
1858 if (caps->cpu_enable)
1859 caps->cpu_enable(caps);
1860 } else {
1861 /*
1862 * Check if the CPU has this capability if it isn't
1863 * safe to have when the system doesn't.
1864 */
1865 if (cpu_has_cap && !cpucap_late_cpu_permitted(caps))
1866 break;
1867 }
1868 }
1869
1870 if (i < ARM64_NCAPS) {
1871 pr_crit("CPU%d: Detected conflict for capability %d (%s), System: %d, CPU: %d\n",
1872 smp_processor_id(), caps->capability,
1873 caps->desc, system_has_cap, cpu_has_cap);
1874 return false;
1875 }
1876
1877 return true;
1878 }
1879
1880 /*
1881 * Check for CPU features that are used in early boot
1882 * based on the Boot CPU value.
1883 */
1884 static void check_early_cpu_features(void)
1885 {
1886 verify_cpu_asid_bits();
1887 /*
1888 * Early features are used by the kernel already. If there
1889 * is a conflict, we cannot proceed further.
1890 */
1891 if (!verify_local_cpu_caps(SCOPE_BOOT_CPU))
1892 cpu_panic_kernel();
1893 }
1894
1895 static void
1896 verify_local_elf_hwcaps(const struct arm64_cpu_capabilities *caps)
1897 {
1898
1899 for (; caps->matches; caps++)
1900 if (cpus_have_elf_hwcap(caps) && !caps->matches(caps, SCOPE_LOCAL_CPU)) {
1901 pr_crit("CPU%d: missing HWCAP: %s\n",
1902 smp_processor_id(), caps->desc);
1903 cpu_die_early();
1904 }
1905 }
1906
1907 static void verify_sve_features(void)
1908 {
1909 u64 safe_zcr = read_sanitised_ftr_reg(SYS_ZCR_EL1);
1910 u64 zcr = read_zcr_features();
1911
1912 unsigned int safe_len = safe_zcr & ZCR_ELx_LEN_MASK;
1913 unsigned int len = zcr & ZCR_ELx_LEN_MASK;
1914
1915 if (len < safe_len || sve_verify_vq_map()) {
1916 pr_crit("CPU%d: SVE: vector length support mismatch\n",
1917 smp_processor_id());
1918 cpu_die_early();
1919 }
1920
1921 /* Add checks on other ZCR bits here if necessary */
1922 }
1923
1924
1925 /*
1926 * Run through the enabled system capabilities and enable() it on this CPU.
1927 * The capabilities were decided based on the available CPUs at the boot time.
1928 * Any new CPU should match the system wide status of the capability. If the
1929 * new CPU doesn't have a capability which the system now has enabled, we
1930 * cannot do anything to fix it up and could cause unexpected failures. So
1931 * we park the CPU.
1932 */
1933 static void verify_local_cpu_capabilities(void)
1934 {
1935 /*
1936 * The capabilities with SCOPE_BOOT_CPU are checked from
1937 * check_early_cpu_features(), as they need to be verified
1938 * on all secondary CPUs.
1939 */
1940 if (!verify_local_cpu_caps(SCOPE_ALL & ~SCOPE_BOOT_CPU))
1941 cpu_die_early();
1942
1943 verify_local_elf_hwcaps(arm64_elf_hwcaps);
1944
1945 if (system_supports_32bit_el0())
1946 verify_local_elf_hwcaps(compat_elf_hwcaps);
1947
1948 if (system_supports_sve())
1949 verify_sve_features();
1950 }
1951
1952 void check_local_cpu_capabilities(void)
1953 {
1954 /*
1955 * All secondary CPUs should conform to the early CPU features
1956 * in use by the kernel based on boot CPU.
1957 */
1958 check_early_cpu_features();
1959
1960 /*
1961 * If we haven't finalised the system capabilities, this CPU gets
1962 * a chance to update the errata work arounds and local features.
1963 * Otherwise, this CPU should verify that it has all the system
1964 * advertised capabilities.
1965 */
1966 if (!sys_caps_initialised)
1967 update_cpu_capabilities(SCOPE_LOCAL_CPU);
1968 else
1969 verify_local_cpu_capabilities();
1970 }
1971
1972 static void __init setup_boot_cpu_capabilities(void)
1973 {
1974 /* Detect capabilities with either SCOPE_BOOT_CPU or SCOPE_LOCAL_CPU */
1975 update_cpu_capabilities(SCOPE_BOOT_CPU | SCOPE_LOCAL_CPU);
1976 /* Enable the SCOPE_BOOT_CPU capabilities alone right away */
1977 enable_cpu_capabilities(SCOPE_BOOT_CPU);
1978 }
1979
1980 DEFINE_STATIC_KEY_FALSE(arm64_const_caps_ready);
1981 EXPORT_SYMBOL(arm64_const_caps_ready);
1982
1983 static void __init mark_const_caps_ready(void)
1984 {
1985 static_branch_enable(&arm64_const_caps_ready);
1986 }
1987
1988 bool this_cpu_has_cap(unsigned int n)
1989 {
1990 if (!WARN_ON(preemptible()) && n < ARM64_NCAPS) {
1991 const struct arm64_cpu_capabilities *cap = cpu_hwcaps_ptrs[n];
1992
1993 if (cap)
1994 return cap->matches(cap, SCOPE_LOCAL_CPU);
1995 }
1996
1997 return false;
1998 }
1999
2000 void cpu_set_feature(unsigned int num)
2001 {
2002 WARN_ON(num >= MAX_CPU_FEATURES);
2003 elf_hwcap |= BIT(num);
2004 }
2005 EXPORT_SYMBOL_GPL(cpu_set_feature);
2006
2007 bool cpu_have_feature(unsigned int num)
2008 {
2009 WARN_ON(num >= MAX_CPU_FEATURES);
2010 return elf_hwcap & BIT(num);
2011 }
2012 EXPORT_SYMBOL_GPL(cpu_have_feature);
2013
2014 unsigned long cpu_get_elf_hwcap(void)
2015 {
2016 /*
2017 * We currently only populate the first 32 bits of AT_HWCAP. Please
2018 * note that for userspace compatibility we guarantee that bits 62
2019 * and 63 will always be returned as 0.
2020 */
2021 return lower_32_bits(elf_hwcap);
2022 }
2023
2024 unsigned long cpu_get_elf_hwcap2(void)
2025 {
2026 return upper_32_bits(elf_hwcap);
2027 }
2028
2029 static void __init setup_system_capabilities(void)
2030 {
2031 /*
2032 * We have finalised the system-wide safe feature
2033 * registers, finalise the capabilities that depend
2034 * on it. Also enable all the available capabilities,
2035 * that are not enabled already.
2036 */
2037 update_cpu_capabilities(SCOPE_SYSTEM);
2038 enable_cpu_capabilities(SCOPE_ALL & ~SCOPE_BOOT_CPU);
2039 }
2040
2041 void __init setup_cpu_features(void)
2042 {
2043 u32 cwg;
2044
2045 setup_system_capabilities();
2046 mark_const_caps_ready();
2047 setup_elf_hwcaps(arm64_elf_hwcaps);
2048
2049 if (system_supports_32bit_el0())
2050 setup_elf_hwcaps(compat_elf_hwcaps);
2051
2052 if (system_uses_ttbr0_pan())
2053 pr_info("emulated: Privileged Access Never (PAN) using TTBR0_EL1 switching\n");
2054
2055 sve_setup();
2056 minsigstksz_setup();
2057
2058 /* Advertise that we have computed the system capabilities */
2059 set_sys_caps_initialised();
2060
2061 /*
2062 * Check for sane CTR_EL0.CWG value.
2063 */
2064 cwg = cache_type_cwg();
2065 if (!cwg)
2066 pr_warn("No Cache Writeback Granule information, assuming %d\n",
2067 ARCH_DMA_MINALIGN);
2068 }
2069
2070 static bool __maybe_unused
2071 cpufeature_pan_not_uao(const struct arm64_cpu_capabilities *entry, int __unused)
2072 {
2073 return (cpus_have_const_cap(ARM64_HAS_PAN) && !cpus_have_const_cap(ARM64_HAS_UAO));
2074 }
2075
2076 static void __maybe_unused cpu_enable_cnp(struct arm64_cpu_capabilities const *cap)
2077 {
2078 cpu_replace_ttbr1(lm_alias(swapper_pg_dir));
2079 }
2080
2081 /*
2082 * We emulate only the following system register space.
2083 * Op0 = 0x3, CRn = 0x0, Op1 = 0x0, CRm = [0, 4 - 7]
2084 * See Table C5-6 System instruction encodings for System register accesses,
2085 * ARMv8 ARM(ARM DDI 0487A.f) for more details.
2086 */
2087 static inline bool __attribute_const__ is_emulated(u32 id)
2088 {
2089 return (sys_reg_Op0(id) == 0x3 &&
2090 sys_reg_CRn(id) == 0x0 &&
2091 sys_reg_Op1(id) == 0x0 &&
2092 (sys_reg_CRm(id) == 0 ||
2093 ((sys_reg_CRm(id) >= 4) && (sys_reg_CRm(id) <= 7))));
2094 }
2095
2096 /*
2097 * With CRm == 0, reg should be one of :
2098 * MIDR_EL1, MPIDR_EL1 or REVIDR_EL1.
2099 */
2100 static inline int emulate_id_reg(u32 id, u64 *valp)
2101 {
2102 switch (id) {
2103 case SYS_MIDR_EL1:
2104 *valp = read_cpuid_id();
2105 break;
2106 case SYS_MPIDR_EL1:
2107 *valp = SYS_MPIDR_SAFE_VAL;
2108 break;
2109 case SYS_REVIDR_EL1:
2110 /* IMPLEMENTATION DEFINED values are emulated with 0 */
2111 *valp = 0;
2112 break;
2113 default:
2114 return -EINVAL;
2115 }
2116
2117 return 0;
2118 }
2119
2120 static int emulate_sys_reg(u32 id, u64 *valp)
2121 {
2122 struct arm64_ftr_reg *regp;
2123
2124 if (!is_emulated(id))
2125 return -EINVAL;
2126
2127 if (sys_reg_CRm(id) == 0)
2128 return emulate_id_reg(id, valp);
2129
2130 regp = get_arm64_ftr_reg(id);
2131 if (regp)
2132 *valp = arm64_ftr_reg_user_value(regp);
2133 else
2134 /*
2135 * The untracked registers are either IMPLEMENTATION DEFINED
2136 * (e.g, ID_AFR0_EL1) or reserved RAZ.
2137 */
2138 *valp = 0;
2139 return 0;
2140 }
2141
2142 int do_emulate_mrs(struct pt_regs *regs, u32 sys_reg, u32 rt)
2143 {
2144 int rc;
2145 u64 val;
2146
2147 rc = emulate_sys_reg(sys_reg, &val);
2148 if (!rc) {
2149 pt_regs_write_reg(regs, rt, val);
2150 arm64_skip_faulting_instruction(regs, AARCH64_INSN_SIZE);
2151 }
2152 return rc;
2153 }
2154
2155 static int emulate_mrs(struct pt_regs *regs, u32 insn)
2156 {
2157 u32 sys_reg, rt;
2158
2159 /*
2160 * sys_reg values are defined as used in mrs/msr instruction.
2161 * shift the imm value to get the encoding.
2162 */
2163 sys_reg = (u32)aarch64_insn_decode_immediate(AARCH64_INSN_IMM_16, insn) << 5;
2164 rt = aarch64_insn_decode_register(AARCH64_INSN_REGTYPE_RT, insn);
2165 return do_emulate_mrs(regs, sys_reg, rt);
2166 }
2167
2168 static struct undef_hook mrs_hook = {
2169 .instr_mask = 0xfff00000,
2170 .instr_val = 0xd5300000,
2171 .pstate_mask = PSR_AA32_MODE_MASK,
2172 .pstate_val = PSR_MODE_EL0t,
2173 .fn = emulate_mrs,
2174 };
2175
2176 static int __init enable_mrs_emulation(void)
2177 {
2178 register_undef_hook(&mrs_hook);
2179 return 0;
2180 }
2181
2182 core_initcall(enable_mrs_emulation);
2183
2184 ssize_t cpu_show_meltdown(struct device *dev, struct device_attribute *attr,
2185 char *buf)
2186 {
2187 if (__meltdown_safe)
2188 return sprintf(buf, "Not affected\n");
2189
2190 if (arm64_kernel_unmapped_at_el0())
2191 return sprintf(buf, "Mitigation: PTI\n");
2192
2193 return sprintf(buf, "Vulnerable\n");
2194 }
Linux with added FPC-III support