[PATCH v4 17/26] arm64: cpucaps: Add GICv5 CPU interface (GCIE) capability

Lorenzo Pieralisi
2025-05-13T18:32:19Z

Implement the GCIE capability as a strict boot cpu capability to
detect whether architectural GICv5 support is available in HW.

Plug it in with a naming consistent with the existing GICv3
CPU interface capability.

Signed-off-by: Lorenzo Pieralisi <lpieralisi@kernel.org>
Cc: Will Deacon <will@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Marc Zyngier <maz@kernel.org>
---
arch/arm64/kernel/cpufeature.c | 7 +++++++
arch/arm64/tools/cpucaps | 1 +
2 files changed, 8 insertions(+)

diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index cbb49de451f45fbee3100ea01e77b06352bd55ac..4d5163a20ee0fb09380ea5f1f2d37afb7257edfb 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -3041,6 +3041,13 @@ static const struct arm64_cpu_capabilities arm64_features[] = {
.matches = has_pmuv3,
},
#endif
+ {
+ .desc = "GICv5 CPU interface",
+ .type = ARM64_CPUCAP_STRICT_BOOT_CPU_FEATURE,
+ .capability = ARM64_HAS_GICV5_CPUIF,
+ .matches = has_cpuid_feature,
+ ARM64_CPUID_FIELDS(ID_AA64PFR2_EL1, GCIE, IMP)
+ },
{},
};

diff --git a/arch/arm64/tools/cpucaps b/arch/arm64/tools/cpucaps
index 860ec49cc0530885c138b7dc7f67d58cd69b2593..c36f4165e2bb460abde81baf453199f62dd265b0 100644
--- a/arch/arm64/tools/cpucaps
+++ b/arch/arm64/tools/cpucaps
@@ -35,6 +35,7 @@ HAS_GENERIC_AUTH_ARCH_QARMA3
HAS_GENERIC_AUTH_ARCH_QARMA5
HAS_GENERIC_AUTH_IMP_DEF
HAS_GICV3_CPUIF
+HAS_GICV5_CPUIF
HAS_GIC_PRIO_MASKING
HAS_GIC_PRIO_RELAXED_SYNC
HAS_HCR_NV1

--
2.48.0