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| author | Amit Daniel Kachhap <amit.kachhap@arm.com> | 2022-11-17 08:58:31 +0300 |
|---|---|---|
| committer | Russell King (Oracle) <rmk+kernel@armlinux.org.uk> | 2022-11-28 14:57:34 +0300 |
| commit | 956ca3a4eb81c1b8cc3226af3083847544dcb098 (patch) | |
| tree | 85ca472cbbdea50bcd6d191bc04b85a3c454af75 | |
| parent | 23b6d4ad6e7a3028dd88aff7e2b0e5a81da8565e (diff) | |
| download | linux-956ca3a4eb81c1b8cc3226af3083847544dcb098.tar.xz | |
ARM: 9272/1: vfp: Add hwcap for FEAT_AA32I8MM
Int8 matrix multiplication (FEAT_AA32I8MM) is a feature present in AArch32 state for Armv8 and is represented by ISAR6.I8MM identification register.
This feature denotes the presence of VSMMLA, VSUDOT, VUMMLA, VUSMMLA and
VUSDOT instructions and hence adding a hwcap will enable the userspace
to check it before trying to use those instructions.
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Amit Daniel Kachhap <amit.kachhap@arm.com>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
| -rw-r--r-- | arch/arm/include/uapi/asm/hwcap.h | 1 | ||||
| -rw-r--r-- | arch/arm/kernel/setup.c | 1 | ||||
| -rw-r--r-- | arch/arm/vfp/vfpmodule.c | 6 |
3 files changed, 8 insertions, 0 deletions
diff --git a/arch/arm/include/uapi/asm/hwcap.h b/arch/arm/include/uapi/asm/hwcap.h index 14e260e2d6d0..46833c668ec2 100644 --- a/arch/arm/include/uapi/asm/hwcap.h +++ b/arch/arm/include/uapi/asm/hwcap.h @@ -33,6 +33,7 @@ #define HWCAP_ASIMDDP (1 << 24) #define HWCAP_ASIMDFHM (1 << 25) #define HWCAP_ASIMDBF16 (1 << 26) +#define HWCAP_I8MM (1 << 27) /* * HWCAP2 flags - for elf_hwcap2 (in kernel) and AT_HWCAP2 diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c index 070067cb6c77..5807fa021785 100644 --- a/arch/arm/kernel/setup.c +++ b/arch/arm/kernel/setup.c @@ -1254,6 +1254,7 @@ static const char *hwcap_str[] = { "asimddp", "asimdfhm", "asimdbf16", + "i8mm", NULL }; diff --git a/arch/arm/vfp/vfpmodule.c b/arch/arm/vfp/vfpmodule.c index ff574cb8a0b9..281110423871 100644 --- a/arch/arm/vfp/vfpmodule.c +++ b/arch/arm/vfp/vfpmodule.c @@ -857,6 +857,12 @@ static int __init vfp_init(void) */ if (cpuid_feature_extract_field(isar6, 20) == 0x1) elf_hwcap |= HWCAP_ASIMDBF16; + /* + * Check for the presence of Advanced SIMD and floating point + * Int8 matrix multiplication instructions instructions. + */ + if (cpuid_feature_extract_field(isar6, 24) == 0x1) + elf_hwcap |= HWCAP_I8MM; /* Extract the architecture version on pre-cpuid scheme */ } else { |