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arm64/hwcap: Describe 2024 dpISA extensions to userspace

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The 2024 dpISA introduces a number of architecture features all of which
only add new instructions so only require the addition of hwcaps and ID
register visibility.

Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20250107-arm64-2024-dpisa-v5-3-7578da51fc3d@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Mark Brown
2025-01-07 22:59:43 +00:00
committed by Will Deacon
parent 47e4717eb6
commit 819935464c
5 changed files with 126 additions and 0 deletions
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50
Documentation/arch/arm64/elf_hwcaps.rst
View File

@@ -174,6 +174,56 @@ HWCAP_GCS
Functionality implied by ID_AA64PFR1_EL1.GCS == 0b1, as
described by Documentation/arch/arm64/gcs.rst.
HWCAP_CMPBR
Functionality implied by ID_AA64ISAR2_EL1.CSSC == 0b0010.
HWCAP_FPRCVT
Functionality implied by ID_AA64ISAR3_EL1.FPRCVT == 0b0001.
HWCAP_F8MM8
Functionality implied by ID_AA64FPFR0_EL1.F8MM8 == 0b0001.
HWCAP_F8MM4
Functionality implied by ID_AA64FPFR0_EL1.F8MM4 == 0b0001.
HWCAP_SVE_F16MM
Functionality implied by ID_AA64PFR0_EL1.SVE == 0b0001 and
ID_AA64ZFR0_EL1.F16MM == 0b0001.
HWCAP_SVE_ELTPERM
Functionality implied by ID_AA64PFR0_EL1.SVE == 0b0001 and
ID_AA64ZFR0_EL1.ELTPERM == 0b0001.
HWCAP_SVE_AES2
Functionality implied by ID_AA64PFR0_EL1.SVE == 0b0001 and
ID_AA64ZFR0_EL1.AES == 0b0011.
HWCAP_SVE_BFSCALE
Functionality implied by ID_AA64PFR0_EL1.SVE == 0b0001 and
ID_AA64ZFR0_EL1.B16B16 == 0b0010.
HWCAP_SVE2P2
Functionality implied by ID_AA64PFR0_EL1.SVE == 0b0001 and
ID_AA64ZFR0_EL1.SVEver == 0b0011.
HWCAP_SME2P2
Functionality implied by ID_AA64SMFR0_EL1.SMEver == 0b0011.
HWCAP_SME_SBITPERM
Functionality implied by ID_AA64SMFR0_EL1.SBitPerm == 0b1.
HWCAP_SME_AES
Functionality implied by ID_AA64SMFR0_EL1.AES == 0b1.
HWCAP_SME_SFEXPA
Functionality implied by ID_AA64SMFR0_EL1.SFEXPA == 0b1.
HWCAP_SME_STMOP
Functionality implied by ID_AA64SMFR0_EL1.STMOP == 0b1.
HWCAP_SME_SMOP4
Functionality implied by ID_AA64SMFR0_EL1.SMOP4 == 0b1.
HWCAP2_DCPODP
Functionality implied by ID_AA64ISAR1_EL1.DPB == 0b0010.

15
arch/arm64/include/asm/hwcap.h
View File

@@ -93,6 +93,21 @@
#define KERNEL_HWCAP_PACA __khwcap_feature(PACA)
#define KERNEL_HWCAP_PACG __khwcap_feature(PACG)
#define KERNEL_HWCAP_GCS __khwcap_feature(GCS)
#define KERNEL_HWCAP_CMPBR __khwcap_feature(CMPBR)
#define KERNEL_HWCAP_FPRCVT __khwcap_feature(FPRCVT)
#define KERNEL_HWCAP_F8MM8 __khwcap_feature(F8MM8)
#define KERNEL_HWCAP_F8MM4 __khwcap_feature(F8MM4)
#define KERNEL_HWCAP_SVE_F16MM __khwcap_feature(SVE_F16MM)
#define KERNEL_HWCAP_SVE_ELTPERM __khwcap_feature(SVE_ELTPERM)
#define KERNEL_HWCAP_SVE_AES2 __khwcap_feature(SVE_AES2)
#define KERNEL_HWCAP_SVE_BFSCALE __khwcap_feature(SVE_BFSCALE)
#define KERNEL_HWCAP_SVE2P2 __khwcap_feature(SVE2P2)
#define KERNEL_HWCAP_SME2P2 __khwcap_feature(SME2P2)
#define KERNEL_HWCAP_SME_SBITPERM __khwcap_feature(SME_SBITPERM)
#define KERNEL_HWCAP_SME_AES __khwcap_feature(SME_AES)
#define KERNEL_HWCAP_SME_SFEXPA __khwcap_feature(SME_SFEXPA)
#define KERNEL_HWCAP_SME_STMOP __khwcap_feature(SME_STMOP)
#define KERNEL_HWCAP_SME_SMOP4 __khwcap_feature(SME_SMOP4)
#define __khwcap2_feature(x) (const_ilog2(HWCAP2_ ## x) + 64)
#define KERNEL_HWCAP_DCPODP __khwcap2_feature(DCPODP)

15
arch/arm64/include/uapi/asm/hwcap.h
View File

@@ -56,6 +56,21 @@
#define HWCAP_PACA (1 << 30)
#define HWCAP_PACG (1UL << 31)
#define HWCAP_GCS (1UL << 32)
#define HWCAP_CMPBR (1UL << 33)
#define HWCAP_FPRCVT (1UL << 34)
#define HWCAP_F8MM8 (1UL << 35)
#define HWCAP_F8MM4 (1UL << 36)
#define HWCAP_SVE_F16MM (1UL << 37)
#define HWCAP_SVE_ELTPERM (1UL << 38)
#define HWCAP_SVE_AES2 (1UL << 39)
#define HWCAP_SVE_BFSCALE (1UL << 40)
#define HWCAP_SVE2P2 (1UL << 41)
#define HWCAP_SME2P2 (1UL << 42)
#define HWCAP_SME_SBITPERM (1UL << 43)
#define HWCAP_SME_AES (1UL << 44)
#define HWCAP_SME_SFEXPA (1UL << 45)
#define HWCAP_SME_STMOP (1UL << 46)
#define HWCAP_SME_SMOP4 (1UL << 47)
/*
* HWCAP2 flags - for AT_HWCAP2

31
arch/arm64/kernel/cpufeature.c
View File

@@ -268,6 +268,7 @@ static const struct arm64_ftr_bits ftr_id_aa64isar2[] = {
};
static const struct arm64_ftr_bits ftr_id_aa64isar3[] = {
ARM64_FTR_BITS(FTR_VISIBLE, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64ISAR3_EL1_FPRCVT_SHIFT, 4, 0),
ARM64_FTR_BITS(FTR_VISIBLE, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64ISAR3_EL1_FAMINMAX_SHIFT, 4, 0),
ARM64_FTR_END,
};
@@ -317,6 +318,8 @@ static const struct arm64_ftr_bits ftr_id_aa64zfr0[] = {
FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_EL1_F64MM_SHIFT, 4, 0),
ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE),
FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_EL1_F32MM_SHIFT, 4, 0),
ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE),
FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_EL1_F16MM_SHIFT, 4, 0),
ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE),
FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_EL1_I8MM_SHIFT, 4, 0),
ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE),
@@ -329,6 +332,8 @@ static const struct arm64_ftr_bits ftr_id_aa64zfr0[] = {
FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_EL1_BF16_SHIFT, 4, 0),
ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE),
FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_EL1_BitPerm_SHIFT, 4, 0),
ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE),
FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_EL1_EltPerm_SHIFT, 4, 0),
ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE),
FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_EL1_AES_SHIFT, 4, 0),
ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE),
@@ -373,6 +378,16 @@ static const struct arm64_ftr_bits ftr_id_aa64smfr0[] = {
FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_SF8DP4_SHIFT, 1, 0),
ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME),
FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_SF8DP2_SHIFT, 1, 0),
ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME),
FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_SBitPerm_SHIFT, 1, 0),
ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME),
FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_AES_SHIFT, 1, 0),
ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME),
FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_SFEXPA_SHIFT, 1, 0),
ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME),
FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_STMOP_SHIFT, 1, 0),
ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SME),
FTR_STRICT, FTR_EXACT, ID_AA64SMFR0_EL1_SMOP4_SHIFT, 1, 0),
ARM64_FTR_END,
};
@@ -381,6 +396,8 @@ static const struct arm64_ftr_bits ftr_id_aa64fpfr0[] = {
ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_EXACT, ID_AA64FPFR0_EL1_F8FMA_SHIFT, 1, 0),
ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_EXACT, ID_AA64FPFR0_EL1_F8DP4_SHIFT, 1, 0),
ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_EXACT, ID_AA64FPFR0_EL1_F8DP2_SHIFT, 1, 0),
ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_EXACT, ID_AA64FPFR0_EL1_F8MM8_SHIFT, 1, 0),
ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_EXACT, ID_AA64FPFR0_EL1_F8MM4_SHIFT, 1, 0),
ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_EXACT, ID_AA64FPFR0_EL1_F8E4M3_SHIFT, 1, 0),
ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_EXACT, ID_AA64FPFR0_EL1_F8E5M2_SHIFT, 1, 0),
ARM64_FTR_END,
@@ -3092,12 +3109,15 @@ static const struct arm64_cpu_capabilities arm64_elf_hwcaps[] = {
HWCAP_CAP(ID_AA64MMFR2_EL1, AT, IMP, CAP_HWCAP, KERNEL_HWCAP_USCAT),
#ifdef CONFIG_ARM64_SVE
HWCAP_CAP(ID_AA64PFR0_EL1, SVE, IMP, CAP_HWCAP, KERNEL_HWCAP_SVE),
HWCAP_CAP_MATCH_ID(has_sve_feature, ID_AA64ZFR0_EL1, SVEver, SVE2p2, CAP_HWCAP, KERNEL_HWCAP_SVE2P2),
HWCAP_CAP_MATCH_ID(has_sve_feature, ID_AA64ZFR0_EL1, SVEver, SVE2p1, CAP_HWCAP, KERNEL_HWCAP_SVE2P1),
HWCAP_CAP_MATCH_ID(has_sve_feature, ID_AA64ZFR0_EL1, SVEver, SVE2, CAP_HWCAP, KERNEL_HWCAP_SVE2),
HWCAP_CAP_MATCH_ID(has_sve_feature, ID_AA64ZFR0_EL1, AES, IMP, CAP_HWCAP, KERNEL_HWCAP_SVEAES),
HWCAP_CAP_MATCH_ID(has_sve_feature, ID_AA64ZFR0_EL1, AES, PMULL128, CAP_HWCAP, KERNEL_HWCAP_SVEPMULL),
HWCAP_CAP_MATCH_ID(has_sve_feature, ID_AA64ZFR0_EL1, AES, AES2, CAP_HWCAP, KERNEL_HWCAP_SVE_AES2),
HWCAP_CAP_MATCH_ID(has_sve_feature, ID_AA64ZFR0_EL1, BitPerm, IMP, CAP_HWCAP, KERNEL_HWCAP_SVEBITPERM),
HWCAP_CAP_MATCH_ID(has_sve_feature, ID_AA64ZFR0_EL1, B16B16, IMP, CAP_HWCAP, KERNEL_HWCAP_SVE_B16B16),
HWCAP_CAP_MATCH_ID(has_sve_feature, ID_AA64ZFR0_EL1, B16B16, BFSCALE, CAP_HWCAP, KERNEL_HWCAP_SVE_BFSCALE),
HWCAP_CAP_MATCH_ID(has_sve_feature, ID_AA64ZFR0_EL1, BF16, IMP, CAP_HWCAP, KERNEL_HWCAP_SVEBF16),
HWCAP_CAP_MATCH_ID(has_sve_feature, ID_AA64ZFR0_EL1, BF16, EBF16, CAP_HWCAP, KERNEL_HWCAP_SVE_EBF16),
HWCAP_CAP_MATCH_ID(has_sve_feature, ID_AA64ZFR0_EL1, SHA3, IMP, CAP_HWCAP, KERNEL_HWCAP_SVESHA3),
@@ -3105,6 +3125,8 @@ static const struct arm64_cpu_capabilities arm64_elf_hwcaps[] = {
HWCAP_CAP_MATCH_ID(has_sve_feature, ID_AA64ZFR0_EL1, I8MM, IMP, CAP_HWCAP, KERNEL_HWCAP_SVEI8MM),
HWCAP_CAP_MATCH_ID(has_sve_feature, ID_AA64ZFR0_EL1, F32MM, IMP, CAP_HWCAP, KERNEL_HWCAP_SVEF32MM),
HWCAP_CAP_MATCH_ID(has_sve_feature, ID_AA64ZFR0_EL1, F64MM, IMP, CAP_HWCAP, KERNEL_HWCAP_SVEF64MM),
HWCAP_CAP_MATCH_ID(has_sve_feature, ID_AA64ZFR0_EL1, F16MM, IMP, CAP_HWCAP, KERNEL_HWCAP_SVE_F16MM),
HWCAP_CAP_MATCH_ID(has_sve_feature, ID_AA64ZFR0_EL1, EltPerm, IMP, CAP_HWCAP, KERNEL_HWCAP_SVE_ELTPERM),
#endif
#ifdef CONFIG_ARM64_GCS
HWCAP_CAP(ID_AA64PFR1_EL1, GCS, IMP, CAP_HWCAP, KERNEL_HWCAP_GCS),
@@ -3124,6 +3146,7 @@ static const struct arm64_cpu_capabilities arm64_elf_hwcaps[] = {
HWCAP_CAP(ID_AA64MMFR0_EL1, ECV, IMP, CAP_HWCAP, KERNEL_HWCAP_ECV),
HWCAP_CAP(ID_AA64MMFR1_EL1, AFP, IMP, CAP_HWCAP, KERNEL_HWCAP_AFP),
HWCAP_CAP(ID_AA64ISAR2_EL1, CSSC, IMP, CAP_HWCAP, KERNEL_HWCAP_CSSC),
HWCAP_CAP(ID_AA64ISAR2_EL1, CSSC, CMPBR, CAP_HWCAP, KERNEL_HWCAP_CMPBR),
HWCAP_CAP(ID_AA64ISAR2_EL1, RPRFM, IMP, CAP_HWCAP, KERNEL_HWCAP_RPRFM),
HWCAP_CAP(ID_AA64ISAR2_EL1, RPRES, IMP, CAP_HWCAP, KERNEL_HWCAP_RPRES),
HWCAP_CAP(ID_AA64ISAR2_EL1, WFxT, IMP, CAP_HWCAP, KERNEL_HWCAP_WFXT),
@@ -3133,6 +3156,7 @@ static const struct arm64_cpu_capabilities arm64_elf_hwcaps[] = {
HWCAP_CAP(ID_AA64PFR1_EL1, SME, IMP, CAP_HWCAP, KERNEL_HWCAP_SME),
HWCAP_CAP(ID_AA64SMFR0_EL1, FA64, IMP, CAP_HWCAP, KERNEL_HWCAP_SME_FA64),
HWCAP_CAP(ID_AA64SMFR0_EL1, LUTv2, IMP, CAP_HWCAP, KERNEL_HWCAP_SME_LUTV2),
HWCAP_CAP(ID_AA64SMFR0_EL1, SMEver, SME2p2, CAP_HWCAP, KERNEL_HWCAP_SME2P2),
HWCAP_CAP(ID_AA64SMFR0_EL1, SMEver, SME2p1, CAP_HWCAP, KERNEL_HWCAP_SME2P1),
HWCAP_CAP(ID_AA64SMFR0_EL1, SMEver, SME2, CAP_HWCAP, KERNEL_HWCAP_SME2),
HWCAP_CAP(ID_AA64SMFR0_EL1, I16I64, IMP, CAP_HWCAP, KERNEL_HWCAP_SME_I16I64),
@@ -3150,6 +3174,13 @@ static const struct arm64_cpu_capabilities arm64_elf_hwcaps[] = {
HWCAP_CAP(ID_AA64SMFR0_EL1, SF8FMA, IMP, CAP_HWCAP, KERNEL_HWCAP_SME_SF8FMA),
HWCAP_CAP(ID_AA64SMFR0_EL1, SF8DP4, IMP, CAP_HWCAP, KERNEL_HWCAP_SME_SF8DP4),
HWCAP_CAP(ID_AA64SMFR0_EL1, SF8DP2, IMP, CAP_HWCAP, KERNEL_HWCAP_SME_SF8DP2),
HWCAP_CAP(ID_AA64SMFR0_EL1, SF8MM8, IMP, CAP_HWCAP, KERNEL_HWCAP_SME_SF8MM8),
HWCAP_CAP(ID_AA64SMFR0_EL1, SF8MM4, IMP, CAP_HWCAP, KERNEL_HWCAP_SME_SF8MM4),
HWCAP_CAP(ID_AA64SMFR0_EL1, SBitPerm, IMP, CAP_HWCAP, KERNEL_HWCAP_SME_SBITPERM),
HWCAP_CAP(ID_AA64SMFR0_EL1, AES, IMP, CAP_HWCAP, KERNEL_HWCAP_SME_AES),
HWCAP_CAP(ID_AA64SMFR0_EL1, SFEXPA, IMP, CAP_HWCAP, KERNEL_HWCAP_SME_SFEXPA),
HWCAP_CAP(ID_AA64SMFR0_EL1, STMOP, IMP, CAP_HWCAP, KERNEL_HWCAP_SME_STMOP),
HWCAP_CAP(ID_AA64SMFR0_EL1, SMOP4, IMP, CAP_HWCAP, KERNEL_HWCAP_SME_SMOP4),
#endif /* CONFIG_ARM64_SME */
HWCAP_CAP(ID_AA64FPFR0_EL1, F8CVT, IMP, CAP_HWCAP, KERNEL_HWCAP_F8CVT),
HWCAP_CAP(ID_AA64FPFR0_EL1, F8FMA, IMP, CAP_HWCAP, KERNEL_HWCAP_F8FMA),

15
arch/arm64/kernel/cpuinfo.c
View File

@@ -145,6 +145,21 @@ static const char *const hwcap_str[] = {
[KERNEL_HWCAP_SME_SF8DP4] = "smesf8dp4",
[KERNEL_HWCAP_SME_SF8DP2] = "smesf8dp2",
[KERNEL_HWCAP_POE] = "poe",
[KERNEL_HWCAP_CMPBR] = "cmpbr",
[KERNEL_HWCAP_FPRCVT] = "fprcvt",
[KERNEL_HWCAP_F8MM8] = "f8mm8",
[KERNEL_HWCAP_F8MM4] = "f8mm4",
[KERNEL_HWCAP_SVE_F16MM] = "svef16mm",
[KERNEL_HWCAP_SVE_ELTPERM] = "sveeltperm",
[KERNEL_HWCAP_SVE_AES2] = "sveaes2",
[KERNEL_HWCAP_SVE_BFSCALE] = "svebfscale",
[KERNEL_HWCAP_SVE2P2] = "sve2p2",
[KERNEL_HWCAP_SME2P2] = "sme2p2",
[KERNEL_HWCAP_SME_SBITPERM] = "smesbitperm",
[KERNEL_HWCAP_SME_AES] = "smeaes",
[KERNEL_HWCAP_SME_SFEXPA] = "smesfexpa",
[KERNEL_HWCAP_SME_STMOP] = "smestmop",
[KERNEL_HWCAP_SME_SMOP4] = "smesmop4",
};
#ifdef CONFIG_COMPAT