From 4b43f1cd70df69c99aeee9758c16f4de913c7bad Mon Sep 17 00:00:00 2001 From: Mark Rutland Date: Mon, 30 Jan 2023 14:54:27 +0000 Subject: [PATCH] arm64: make ARM64_HAS_GIC_PRIO_MASKING depend on ARM64_HAS_GIC_CPUIF_SYSREGS Currently the arm64_cpu_capabilities structure for ARM64_HAS_GIC_PRIO_MASKING open-codes the same CPU field definitions as the arm64_cpu_capabilities structure for ARM64_HAS_GIC_CPUIF_SYSREGS, so that can_use_gic_priorities() can use has_useable_gicv3_cpuif(). This duplication isn't ideal for the legibility of the code, and sets a bad example for any ARM64_HAS_GIC_* definitions added by subsequent patches. Instead, have ARM64_HAS_GIC_PRIO_MASKING check for the ARM64_HAS_GIC_CPUIF_SYSREGS cpucap, and add a comment explaining why this is safe. Subsequent patches will use the same pattern where one cpucap depends upon another. There should be no functional change as a result of this patch. Signed-off-by: Mark Rutland Reviewed-by: Marc Zyngier Cc: Mark Brown Cc: Will Deacon Link: https://lore.kernel.org/r/20230130145429.903791-4-mark.rutland@arm.com Signed-off-by: Catalin Marinas --- arch/arm64/kernel/cpufeature.c | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-) diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index afd547a5309c..515975f42d03 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -2046,7 +2046,15 @@ early_param("irqchip.gicv3_pseudo_nmi", early_enable_pseudo_nmi); static bool can_use_gic_priorities(const struct arm64_cpu_capabilities *entry, int scope) { - return enable_pseudo_nmi && has_useable_gicv3_cpuif(entry, scope); + /* + * ARM64_HAS_GIC_CPUIF_SYSREGS has a lower index, and is a boot CPU + * feature, so will be detected earlier. + */ + BUILD_BUG_ON(ARM64_HAS_GIC_PRIO_MASKING <= ARM64_HAS_GIC_CPUIF_SYSREGS); + if (!cpus_have_cap(ARM64_HAS_GIC_CPUIF_SYSREGS)) + return false; + + return enable_pseudo_nmi; } #endif @@ -2537,11 +2545,6 @@ static const struct arm64_cpu_capabilities arm64_features[] = { .capability = ARM64_HAS_GIC_PRIO_MASKING, .type = ARM64_CPUCAP_STRICT_BOOT_CPU_FEATURE, .matches = can_use_gic_priorities, - .sys_reg = SYS_ID_AA64PFR0_EL1, - .field_pos = ID_AA64PFR0_EL1_GIC_SHIFT, - .field_width = 4, - .sign = FTR_UNSIGNED, - .min_field_value = 1, }, #endif #ifdef CONFIG_ARM64_E0PD -- 2.25.1