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arm64: add FEAT_LRCPC3 HWCAP 

FEAT_LRCPC3 adds more instructions to support the Release Consistency model.
Add a HWCAP so that userspace can make decisions about instructions it can use.

Signed-off-by: Joey Gouly <joey.gouly@arm.com>
Cc: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20230919162757.2707023-2-joey.gouly@arm.com
[catalin.marinas@arm.com: change the HWCAP number]
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Joey Gouly 2023-09-19 17:27:56 +01:00 committed by Catalin Marinas
parent 3accaef1f6
commit 338a835f40
6 changed files with 8 additions and 0 deletions
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3
Documentation/arch/arm64/elf_hwcaps.rst
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@ -311,6 +311,9 @@ HWCAP2_HBC
HWCAP2_SVE_B16B16
Functionality implied by ID_AA64ZFR0_EL1.B16B16 == 0b0001.
HWCAP2_LRCPC3
Functionality implied by ID_AA64ISAR1_EL1.LRCPC == 0b0011.
4. Unused AT_HWCAP bits
-----------------------

1
arch/arm64/include/asm/hwcap.h
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@ -140,6 +140,7 @@
#define KERNEL_HWCAP_MOPS __khwcap2_feature(MOPS)
#define KERNEL_HWCAP_HBC __khwcap2_feature(HBC)
#define KERNEL_HWCAP_SVE_B16B16 __khwcap2_feature(SVE_B16B16)
#define KERNEL_HWCAP_LRCPC3 __khwcap2_feature(LRCPC3)
/*
* This yields a mask that user programs can use to figure out what

1
arch/arm64/include/uapi/asm/hwcap.h
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@ -105,5 +105,6 @@
#define HWCAP2_MOPS (1UL << 43)
#define HWCAP2_HBC (1UL << 44)
#define HWCAP2_SVE_B16B16 (1UL << 45)
#define HWCAP2_LRCPC3 (1UL << 46)
#endif /* _UAPI__ASM_HWCAP_H */

1
arch/arm64/kernel/cpufeature.c
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@ -2809,6 +2809,7 @@ static const struct arm64_cpu_capabilities arm64_elf_hwcaps[] = {
HWCAP_CAP(ID_AA64ISAR1_EL1, FCMA, IMP, CAP_HWCAP, KERNEL_HWCAP_FCMA),
HWCAP_CAP(ID_AA64ISAR1_EL1, LRCPC, IMP, CAP_HWCAP, KERNEL_HWCAP_LRCPC),
HWCAP_CAP(ID_AA64ISAR1_EL1, LRCPC, LRCPC2, CAP_HWCAP, KERNEL_HWCAP_ILRCPC),
HWCAP_CAP(ID_AA64ISAR1_EL1, LRCPC, LRCPC3, CAP_HWCAP, KERNEL_HWCAP_LRCPC3),
HWCAP_CAP(ID_AA64ISAR1_EL1, FRINTTS, IMP, CAP_HWCAP, KERNEL_HWCAP_FRINT),
HWCAP_CAP(ID_AA64ISAR1_EL1, SB, IMP, CAP_HWCAP, KERNEL_HWCAP_SB),
HWCAP_CAP(ID_AA64ISAR1_EL1, BF16, IMP, CAP_HWCAP, KERNEL_HWCAP_BF16),

1
arch/arm64/kernel/cpuinfo.c
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@ -128,6 +128,7 @@ static const char *const hwcap_str[] = {
[KERNEL_HWCAP_MOPS] = "mops",
[KERNEL_HWCAP_HBC] = "hbc",
[KERNEL_HWCAP_SVE_B16B16] = "sveb16b16",
[KERNEL_HWCAP_LRCPC3] = "lrcpc3",
};
#ifdef CONFIG_COMPAT

1
arch/arm64/tools/sysreg
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@ -1309,6 +1309,7 @@ UnsignedEnum 23:20 LRCPC
0b0000 NI
0b0001 IMP
0b0010 LRCPC2
0b0011 LRCPC3
EndEnum
UnsignedEnum 19:16 FCMA
0b0000 NI