[PATCH v4 6/6] arm64: Advertise ARM64_HAS_DCPODP cpu feature
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STALE2756d
SUPERSEDED
From: Andrew Murray <hidden>
Date: 2019-04-03 11:11:50
Also in:
linux-arm-kernel
Subsystem:
arm64 port (aarch64 architecture), the rest · Maintainers:
Catalin Marinas, Will Deacon, Linus Torvalds
Revision v4 of 3 in this series.
Revisions (3)
- v3 [diff vs current]
- v4 current
- v5 [diff vs current]
Advertise ARM64_HAS_DCPODP when both DC CVAP and DC CVADP are supported. Even though we don't use this feature now, we provide it for consistency with DCPOP and anticipate it being used in the future. Signed-off-by: Andrew Murray <redacted> --- arch/arm64/include/asm/cpucaps.h | 3 ++- arch/arm64/kernel/cpufeature.c | 9 +++++++++ 2 files changed, 11 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/include/asm/cpucaps.h b/arch/arm64/include/asm/cpucaps.h
index f6a76e43f39e..defdc67d9ab4 100644
--- a/arch/arm64/include/asm/cpucaps.h
+++ b/arch/arm64/include/asm/cpucaps.h@@ -61,7 +61,8 @@ #define ARM64_HAS_GENERIC_AUTH_ARCH 40 #define ARM64_HAS_GENERIC_AUTH_IMP_DEF 41 #define ARM64_HAS_IRQ_PRIO_MASKING 42 +#define ARM64_HAS_DCPODP 43 -#define ARM64_NCAPS 43 +#define ARM64_NCAPS 44 #endif /* __ASM_CPUCAPS_H */
diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index f8b682a3a9f4..4ee5d63281ae 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c@@ -1340,6 +1340,15 @@ static const struct arm64_cpu_capabilities arm64_features[] = { .field_pos = ID_AA64ISAR1_DPB_SHIFT, .min_field_value = 1, }, + { + .desc = "Data cache clean to Point of Deep Persistence", + .capability = ARM64_HAS_DCPODP, + .type = ARM64_CPUCAP_SYSTEM_FEATURE, + .matches = has_cpuid_feature, + .sys_reg = SYS_ID_AA64ISAR1_EL1, + .field_pos = ID_AA64ISAR1_DPB_SHIFT, + .min_field_value = 2, + }, #endif #ifdef CONFIG_ARM64_SVE {
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2.21.0