Commit 94d0657f authored by Joey Gouly's avatar Joey Gouly Committed by Catalin Marinas
Browse files

arm64: add FEAT_LSE128 HWCAP 



Add HWCAP for FEAT_LSE128 (128-bit Atomic instructions).

Signed-off-by: default avatarJoey Gouly <joey.gouly@arm.com>
Cc: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20231003124544.858804-2-joey.gouly@arm.com


Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent 80652cc0

Documentation/arch/arm64/elf_hwcaps.rst

+3 −0
Original line number Diff line number Diff line
@@ -314,6 +314,9 @@ HWCAP2_SVE_B16B16 
HWCAP2_LRCPC3

    Functionality implied by ID_AA64ISAR1_EL1.LRCPC == 0b0011.



HWCAP2_LSE128

    Functionality implied by ID_AA64ISAR0_EL1.Atomic == 0b0011.



4. Unused AT_HWCAP bits

-----------------------

arch/arm64/include/asm/hwcap.h

+1 −0
Original line number Diff line number Diff line
@@ -141,6 +141,7 @@ 
#define KERNEL_HWCAP_HBC		__khwcap2_feature(HBC)

#define KERNEL_HWCAP_SVE_B16B16		__khwcap2_feature(SVE_B16B16)

#define KERNEL_HWCAP_LRCPC3		__khwcap2_feature(LRCPC3)

#define KERNEL_HWCAP_LSE128		__khwcap2_feature(LSE128)



/*

 * This yields a mask that user programs can use to figure out what

arch/arm64/include/uapi/asm/hwcap.h

+1 −0
Original line number Diff line number Diff line
@@ -106,5 +106,6 @@ 
#define HWCAP2_HBC		(1UL << 44)

#define HWCAP2_SVE_B16B16	(1UL << 45)

#define HWCAP2_LRCPC3		(1UL << 46)

#define HWCAP2_LSE128		(1UL << 47)



#endif /* _UAPI__ASM_HWCAP_H */

arch/arm64/kernel/cpufeature.c

+1 −0
Original line number Diff line number Diff line
@@ -2789,6 +2789,7 @@ static const struct arm64_cpu_capabilities arm64_elf_hwcaps[] = { 
	HWCAP_CAP(ID_AA64ISAR0_EL1, SHA2, SHA512, CAP_HWCAP, KERNEL_HWCAP_SHA512),

	HWCAP_CAP(ID_AA64ISAR0_EL1, CRC32, IMP, CAP_HWCAP, KERNEL_HWCAP_CRC32),

	HWCAP_CAP(ID_AA64ISAR0_EL1, ATOMIC, IMP, CAP_HWCAP, KERNEL_HWCAP_ATOMICS),

	HWCAP_CAP(ID_AA64ISAR0_EL1, ATOMIC, FEAT_LSE128, CAP_HWCAP, KERNEL_HWCAP_LSE128),

	HWCAP_CAP(ID_AA64ISAR0_EL1, RDM, IMP, CAP_HWCAP, KERNEL_HWCAP_ASIMDRDM),

	HWCAP_CAP(ID_AA64ISAR0_EL1, SHA3, IMP, CAP_HWCAP, KERNEL_HWCAP_SHA3),

	HWCAP_CAP(ID_AA64ISAR0_EL1, SM3, IMP, CAP_HWCAP, KERNEL_HWCAP_SM3),

arch/arm64/kernel/cpuinfo.c

+1 −0
Original line number Diff line number Diff line
@@ -129,6 +129,7 @@ static const char *const hwcap_str[] = { 
	[KERNEL_HWCAP_HBC]		= "hbc",

	[KERNEL_HWCAP_SVE_B16B16]	= "sveb16b16",

	[KERNEL_HWCAP_LRCPC3]		= "lrcpc3",

	[KERNEL_HWCAP_LSE128]		= "lse128",

};



#ifdef CONFIG_COMPAT