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| author | Anshuman Khandual <anshuman.khandual@arm.com> | 2020-05-19 15:10:42 +0530 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2020-05-21 15:47:11 +0100 |
| commit | dd35ec07045753adcc86f89d485e589d860e298f (patch) | |
| tree | 05404e21fac8de6fb1c8cc8db86c9265c814829d /arch/arm64/kernel/cpuinfo.c | |
| parent | 16824085a7dd426408d4403284374da90671e749 (diff) | |
| download | lwn-dd35ec07045753adcc86f89d485e589d860e298f.tar.gz lwn-dd35ec07045753adcc86f89d485e589d860e298f.zip | |
arm64/cpufeature: Introduce ID_DFR1 CPU register
This adds basic building blocks required for ID_DFR1 CPU register which
provides top level information about the debug system in AArch32 state.
We hide the register from KVM guests, as we don't emulate the 'MTPMU'
feature.
This is added per ARM DDI 0487F.a specification.
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: James Morse <james.morse@arm.com>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: kvmarm@lists.cs.columbia.edu
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Suggested-by: Will Deacon <will@kernel.org>
Reviewed-by : Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Link: https://lore.kernel.org/r/1589881254-10082-6-git-send-email-anshuman.khandual@arm.com
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'arch/arm64/kernel/cpuinfo.c')
| -rw-r--r-- | arch/arm64/kernel/cpuinfo.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm64/kernel/cpuinfo.c b/arch/arm64/kernel/cpuinfo.c index cb79b083f97f..50a281703d9d 100644 --- a/arch/arm64/kernel/cpuinfo.c +++ b/arch/arm64/kernel/cpuinfo.c @@ -362,6 +362,7 @@ static void __cpuinfo_store_cpu(struct cpuinfo_arm64 *info) /* Update the 32bit ID registers only if AArch32 is implemented */ if (id_aa64pfr0_32bit_el0(info->reg_id_aa64pfr0)) { info->reg_id_dfr0 = read_cpuid(ID_DFR0_EL1); + info->reg_id_dfr1 = read_cpuid(ID_DFR1_EL1); info->reg_id_isar0 = read_cpuid(ID_ISAR0_EL1); info->reg_id_isar1 = read_cpuid(ID_ISAR1_EL1); info->reg_id_isar2 = read_cpuid(ID_ISAR2_EL1); |