linux-kernel - [PATCH 16/24] arm64: cpucaps: Add GCIE capability

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Message-Id: <20250408-gicv5-host-v1-16-1f26db465f8d@kernel.org>
Date: Tue, 08 Apr 2025 12:50:15 +0200
From: Lorenzo Pieralisi <lpieralisi@...nel.org>
To: Marc Zyngier <maz@...nel.org>, Thomas Gleixner <tglx@...utronix.de>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>
Cc: Sascha Bischoff <sascha.bischoff@....com>, 
 Timothy Hayes <timothy.hayes@....com>, linux-arm-kernel@...ts.infradead.org, 
 linux-kernel@...r.kernel.org, devicetree@...r.kernel.org, 
 Lorenzo Pieralisi <lpieralisi@...nel.org>
Subject: [PATCH 16/24] arm64: cpucaps: Add GCIE capability

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

Signed-off-by: Lorenzo Pieralisi <lpieralisi@...nel.org>
Cc: Will Deacon <will@...nel.org>
Cc: Catalin Marinas <catalin.marinas@....com>
Cc: Marc Zyngier <maz@...nel.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 9c4d6d552b25cb3a31d1fb267bd73d3f82513e69..8c60591633f3d435ad9b80a10e484f26af328964 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 = "GCIE",
+		.type = ARM64_CPUCAP_STRICT_BOOT_CPU_FEATURE,
+		.capability = ARM64_HAS_GCIE,
+		.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 772c1b008e437ed34cedb1c0f663c4dcea8f6759..e87e4bc2501f6b86352c03bd35adf33c160a577c 100644
--- a/arch/arm64/tools/cpucaps
+++ b/arch/arm64/tools/cpucaps
@@ -29,6 +29,7 @@ HAS_EVT
 HAS_FPMR
 HAS_FGT
 HAS_FPSIMD
+HAS_GCIE
 HAS_GCS
 HAS_GENERIC_AUTH
 HAS_GENERIC_AUTH_ARCH_QARMA3

-- 
2.48.0