diff options
Diffstat (limited to 'arch/arm64/kernel/cpuinfo.c')
| -rw-r--r-- | arch/arm64/kernel/cpuinfo.c | 23 |
1 files changed, 21 insertions, 2 deletions
diff --git a/arch/arm64/kernel/cpuinfo.c b/arch/arm64/kernel/cpuinfo.c index 504fdaa8367e..57b641747534 100644 --- a/arch/arm64/kernel/cpuinfo.c +++ b/arch/arm64/kernel/cpuinfo.c @@ -18,6 +18,7 @@ #include <asm/cachetype.h> #include <asm/cpu.h> #include <asm/cputype.h> +#include <asm/cpufeature.h> #include <linux/bitops.h> #include <linux/bug.h> @@ -111,6 +112,15 @@ static void cpuinfo_sanity_check(struct cpuinfo_arm64 *cur) diff |= CHECK(cntfrq, boot, cur, cpu); /* + * The kernel uses self-hosted debug features and expects CPUs to + * support identical debug features. We presently need CTX_CMPs, WRPs, + * and BRPs to be identical. + * ID_AA64DFR1 is currently RES0. + */ + diff |= CHECK(id_aa64dfr0, boot, cur, cpu); + diff |= CHECK(id_aa64dfr1, boot, cur, cpu); + + /* * Even in big.LITTLE, processors should be identical instruction-set * wise. */ @@ -143,7 +153,12 @@ static void cpuinfo_sanity_check(struct cpuinfo_arm64 *cur) diff |= CHECK(id_isar3, boot, cur, cpu); diff |= CHECK(id_isar4, boot, cur, cpu); diff |= CHECK(id_isar5, boot, cur, cpu); - diff |= CHECK(id_mmfr0, boot, cur, cpu); + /* + * Regardless of the value of the AuxReg field, the AIFSR, ADFSR, and + * ACTLR formats could differ across CPUs and therefore would have to + * be trapped for virtualization anyway. + */ + diff |= CHECK_MASK(id_mmfr0, 0xff0fffff, boot, cur, cpu); diff |= CHECK(id_mmfr1, boot, cur, cpu); diff |= CHECK(id_mmfr2, boot, cur, cpu); diff |= CHECK(id_mmfr3, boot, cur, cpu); @@ -155,7 +170,7 @@ static void cpuinfo_sanity_check(struct cpuinfo_arm64 *cur) * pretend to support them. */ WARN_TAINT_ONCE(diff, TAINT_CPU_OUT_OF_SPEC, - "Unsupported CPU feature variation."); + "Unsupported CPU feature variation.\n"); } static void __cpuinfo_store_cpu(struct cpuinfo_arm64 *info) @@ -165,6 +180,8 @@ static void __cpuinfo_store_cpu(struct cpuinfo_arm64 *info) info->reg_dczid = read_cpuid(DCZID_EL0); info->reg_midr = read_cpuid_id(); + info->reg_id_aa64dfr0 = read_cpuid(ID_AA64DFR0_EL1); + info->reg_id_aa64dfr1 = read_cpuid(ID_AA64DFR1_EL1); info->reg_id_aa64isar0 = read_cpuid(ID_AA64ISAR0_EL1); info->reg_id_aa64isar1 = read_cpuid(ID_AA64ISAR1_EL1); info->reg_id_aa64mmfr0 = read_cpuid(ID_AA64MMFR0_EL1); @@ -186,6 +203,8 @@ static void __cpuinfo_store_cpu(struct cpuinfo_arm64 *info) info->reg_id_pfr1 = read_cpuid(ID_PFR1_EL1); cpuinfo_detect_icache_policy(info); + + check_local_cpu_errata(); } void cpuinfo_store_cpu(void) |