linux-kernel - [PATCH v4 02/26] arm64: cpufeature: Add cpufeature for IRQ priority masking

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Date:   Fri, 25 May 2018 10:49:08 +0100
From:   Julien Thierry <julien.thierry@....com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, daniel.thompson@...aro.org,
        joel@...lfernandes.org, marc.zyngier@....com, mark.rutland@....com,
        christoffer.dall@....com, james.morse@....com,
        catalin.marinas@....com, will.deacon@....com,
        Julien Thierry <julien.thierry@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>
Subject: [PATCH v4 02/26] arm64: cpufeature: Add cpufeature for IRQ priority masking

Add a cpufeature indicating whether a cpu supports masking interrupts
by priority.

Signed-off-by: Julien Thierry <julien.thierry@....com>
Cc: Catalin Marinas <catalin.marinas@....com>
Cc: Will Deacon <will.deacon@....com>
Cc: Marc Zyngier <marc.zyngier@....com>
Cc: Suzuki K Poulose <suzuki.poulose@....com>
---
 arch/arm64/include/asm/cpucaps.h |  3 ++-
 arch/arm64/kernel/cpufeature.c   | 15 +++++++++++++++
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/include/asm/cpucaps.h b/arch/arm64/include/asm/cpucaps.h
index bc51b72..cd8f9ed 100644
--- a/arch/arm64/include/asm/cpucaps.h
+++ b/arch/arm64/include/asm/cpucaps.h
@@ -48,7 +48,8 @@
 #define ARM64_HAS_CACHE_IDC			27
 #define ARM64_HAS_CACHE_DIC			28
 #define ARM64_HW_DBM				29
+#define ARM64_HAS_IRQ_PRIO_MASKING		30
 
-#define ARM64_NCAPS				30
+#define ARM64_NCAPS				31
 
 #endif /* __ASM_CPUCAPS_H */
diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index e03e897..a177104 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -1202,6 +1202,21 @@ static void cpu_copy_el2regs(const struct arm64_cpu_capabilities *__unused)
 		.cpu_enable = cpu_enable_hw_dbm,
 	},
 #endif
+#ifdef CONFIG_USE_ICC_SYSREGS_FOR_IRQFLAGS
+	{
+		/*
+		 * Depends on having GICv3
+		 */
+		.desc = "IRQ priority masking",
+		.capability = ARM64_HAS_IRQ_PRIO_MASKING,
+		.type = ARM64_CPUCAP_STRICT_BOOT_CPU_FEATURE,
+		.matches = has_useable_gicv3_cpuif,
+		.sys_reg = SYS_ID_AA64PFR0_EL1,
+		.field_pos = ID_AA64PFR0_GIC_SHIFT,
+		.sign = FTR_UNSIGNED,
+		.min_field_value = 1,
+	},
+#endif
 	{},
 };
 
-- 
1.9.1