X-Git-Url: https://git.kernelconcepts.de/?a=blobdiff_plain;f=arch%2Farm64%2Fkernel%2Fcpufeature.c;h=305f30dc9e633fe86947621e54d802744e59df52;hb=bdc15ce316507225587552a3e63e7e09d94b81be;hp=3c9aed32f70b2113773f671053a0f6ac87632b4a;hpb=1b3dfde386b7c72b8f5430dc40eee538eb40c948;p=karo-tx-linux.git

diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index 3c9aed32f70b..305f30dc9e63 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -23,6 +23,8 @@
 #include <asm/cpufeature.h>
 #include <asm/processor.h>
 
+#include <linux/irqchip/arm-gic-v3.h>
+
 static bool
 feature_matches(u64 reg, const struct arm64_cpu_capabilities *entry)
 {
@@ -45,11 +47,26 @@ __ID_FEAT_CHK(id_aa64pfr0);
 __ID_FEAT_CHK(id_aa64mmfr1);
 __ID_FEAT_CHK(id_aa64isar0);
 
+static bool has_useable_gicv3_cpuif(const struct arm64_cpu_capabilities *entry)
+{
+	bool has_sre;
+
+	if (!has_id_aa64pfr0_feature(entry))
+		return false;
+
+	has_sre = gic_enable_sre();
+	if (!has_sre)
+		pr_warn_once("%s present but disabled by higher exception level\n",
+			     entry->desc);
+
+	return has_sre;
+}
+
 static const struct arm64_cpu_capabilities arm64_features[] = {
 	{
 		.desc = "GIC system register CPU interface",
 		.capability = ARM64_HAS_SYSREG_GIC_CPUIF,
-		.matches = has_id_aa64pfr0_feature,
+		.matches = has_useable_gicv3_cpuif,
 		.field_pos = 24,
 		.min_field_value = 1,
 	},