diff options
| author | Mark Brown <broonie@kernel.org> | 2023-09-15 13:18:06 +0100 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2023-09-29 15:56:17 +0100 |
| commit | 5d5b4e8c2d9ec12a5cc013b82c1873cd387e0ddf (patch) | |
| tree | f7705ca29fb1e96d692e1e69e2fbe56ab2dcfd42 | |
| parent | 6465e260f48790807eef06b583b38ca9789b6072 (diff) | |
arm64/sve: Report FEAT_SVE_B16B16 to userspace
SVE 2.1 introduced a new feature FEAT_SVE_B16B16 which adds instructions
supporting the BFloat16 floating point format. Report this to userspace
through the ID registers and hwcap.
Reported-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20230915-arm64-zfr-b16b16-el0-v1-1-f9aba807bdb5@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
| -rw-r--r-- | Documentation/arch/arm64/cpu-feature-registers.rst | 2 | ||||
| -rw-r--r-- | Documentation/arch/arm64/elf_hwcaps.rst | 3 | ||||
| -rw-r--r-- | arch/arm64/include/asm/hwcap.h | 1 | ||||
| -rw-r--r-- | arch/arm64/include/uapi/asm/hwcap.h | 1 | ||||
| -rw-r--r-- | arch/arm64/kernel/cpufeature.c | 3 | ||||
| -rw-r--r-- | arch/arm64/kernel/cpuinfo.c | 1 | ||||
| -rw-r--r-- | arch/arm64/tools/sysreg | 6 |
7 files changed, 16 insertions, 1 deletions
diff --git a/Documentation/arch/arm64/cpu-feature-registers.rst b/Documentation/arch/arm64/cpu-feature-registers.rst index de6d8a4790e2b..44f9bd78539d3 100644 --- a/Documentation/arch/arm64/cpu-feature-registers.rst +++ b/Documentation/arch/arm64/cpu-feature-registers.rst @@ -268,6 +268,8 @@ infrastructure: +------------------------------+---------+---------+ | SHA3 | [35-32] | y | +------------------------------+---------+---------+ + | B16B16 | [27-24] | y | + +------------------------------+---------+---------+ | BF16 | [23-20] | y | +------------------------------+---------+---------+ | BitPerm | [19-16] | y | diff --git a/Documentation/arch/arm64/elf_hwcaps.rst b/Documentation/arch/arm64/elf_hwcaps.rst index 76ff9d7398fda..2ad0a369d96a9 100644 --- a/Documentation/arch/arm64/elf_hwcaps.rst +++ b/Documentation/arch/arm64/elf_hwcaps.rst @@ -308,6 +308,9 @@ HWCAP2_MOPS HWCAP2_HBC Functionality implied by ID_AA64ISAR2_EL1.BC == 0b0001. +HWCAP2_SVE_B16B16 + Functionality implied by ID_AA64ZFR0_EL1.B16B16 == 0b0001. + 4. Unused AT_HWCAP bits ----------------------- diff --git a/arch/arm64/include/asm/hwcap.h b/arch/arm64/include/asm/hwcap.h index 521267478d187..210a41f8b10a9 100644 --- a/arch/arm64/include/asm/hwcap.h +++ b/arch/arm64/include/asm/hwcap.h @@ -139,6 +139,7 @@ #define KERNEL_HWCAP_SME_F16F16 __khwcap2_feature(SME_F16F16) #define KERNEL_HWCAP_MOPS __khwcap2_feature(MOPS) #define KERNEL_HWCAP_HBC __khwcap2_feature(HBC) +#define KERNEL_HWCAP_SVE_B16B16 __khwcap2_feature(SVE_B16B16) /* * This yields a mask that user programs can use to figure out what diff --git a/arch/arm64/include/uapi/asm/hwcap.h b/arch/arm64/include/uapi/asm/hwcap.h index 53026f45a5092..6faf549077c57 100644 --- a/arch/arm64/include/uapi/asm/hwcap.h +++ b/arch/arm64/include/uapi/asm/hwcap.h @@ -104,5 +104,6 @@ #define HWCAP2_SME_F16F16 (1UL << 42) #define HWCAP2_MOPS (1UL << 43) #define HWCAP2_HBC (1UL << 44) +#define HWCAP2_SVE_B16B16 (1UL << 45) #endif /* _UAPI__ASM_HWCAP_H */ diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index 444a73c2e6385..a013dfd5b6e90 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -279,6 +279,8 @@ static const struct arm64_ftr_bits ftr_id_aa64zfr0[] = { ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_EL1_SHA3_SHIFT, 4, 0), ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), + FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_EL1_B16B16_SHIFT, 4, 0), + ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), 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), @@ -2821,6 +2823,7 @@ static const struct arm64_cpu_capabilities arm64_elf_hwcaps[] = { HWCAP_CAP(ID_AA64ZFR0_EL1, AES, IMP, CAP_HWCAP, KERNEL_HWCAP_SVEAES), HWCAP_CAP(ID_AA64ZFR0_EL1, AES, PMULL128, CAP_HWCAP, KERNEL_HWCAP_SVEPMULL), HWCAP_CAP(ID_AA64ZFR0_EL1, BitPerm, IMP, CAP_HWCAP, KERNEL_HWCAP_SVEBITPERM), + HWCAP_CAP(ID_AA64ZFR0_EL1, B16B16, IMP, CAP_HWCAP, KERNEL_HWCAP_SVE_B16B16), HWCAP_CAP(ID_AA64ZFR0_EL1, BF16, IMP, CAP_HWCAP, KERNEL_HWCAP_SVEBF16), HWCAP_CAP(ID_AA64ZFR0_EL1, BF16, EBF16, CAP_HWCAP, KERNEL_HWCAP_SVE_EBF16), HWCAP_CAP(ID_AA64ZFR0_EL1, SHA3, IMP, CAP_HWCAP, KERNEL_HWCAP_SVESHA3), diff --git a/arch/arm64/kernel/cpuinfo.c b/arch/arm64/kernel/cpuinfo.c index 98fda85005353..ea2a319881036 100644 --- a/arch/arm64/kernel/cpuinfo.c +++ b/arch/arm64/kernel/cpuinfo.c @@ -127,6 +127,7 @@ static const char *const hwcap_str[] = { [KERNEL_HWCAP_SME_F16F16] = "smef16f16", [KERNEL_HWCAP_MOPS] = "mops", [KERNEL_HWCAP_HBC] = "hbc", + [KERNEL_HWCAP_SVE_B16B16] = "sveb16b16", }; #ifdef CONFIG_COMPAT diff --git a/arch/arm64/tools/sysreg b/arch/arm64/tools/sysreg index 76ce150e7347e..bb69ab34202b0 100644 --- a/arch/arm64/tools/sysreg +++ b/arch/arm64/tools/sysreg @@ -1026,7 +1026,11 @@ UnsignedEnum 35:32 SHA3 0b0000 NI 0b0001 IMP EndEnum -Res0 31:24 +Res0 31:28 +UnsignedEnum 27:24 B16B16 + 0b0000 NI + 0b0001 IMP +EndEnum UnsignedEnum 23:20 BF16 0b0000 NI 0b0001 IMP |