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ARM: 9272/1: vfp: Add hwcap for FEAT_AA32I8MM

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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>
This commit is contained in:
Amit Daniel Kachhap 2022-11-17 06:58:31 +01:00 committed by Russell King (Oracle)
parent 23b6d4ad6e
commit 956ca3a4eb
3 changed files with 8 additions and 0 deletions
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1
arch/arm/include/uapi/asm/hwcap.h
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@ -33,6 +33,7 @@
#define HWCAP_ASIMDDP (1 << 24) #define HWCAP_ASIMDDP (1 << 24)
#define HWCAP_ASIMDFHM (1 << 25) #define HWCAP_ASIMDFHM (1 << 25)
#define HWCAP_ASIMDBF16 (1 << 26) #define HWCAP_ASIMDBF16 (1 << 26)
#define HWCAP_I8MM (1 << 27)
/* /*
* HWCAP2 flags - for elf_hwcap2 (in kernel) and AT_HWCAP2 * HWCAP2 flags - for elf_hwcap2 (in kernel) and AT_HWCAP2

1
arch/arm/kernel/setup.c
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@ -1254,6 +1254,7 @@ static const char *hwcap_str[] = {
"asimddp", "asimddp",
"asimdfhm", "asimdfhm",
"asimdbf16", "asimdbf16",
"i8mm",
NULL NULL
}; };

6
arch/arm/vfp/vfpmodule.c
View File

@ -857,6 +857,12 @@ static int __init vfp_init(void)
*/ */
if (cpuid_feature_extract_field(isar6, 20) == 0x1) if (cpuid_feature_extract_field(isar6, 20) == 0x1)
elf_hwcap |= HWCAP_ASIMDBF16; 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 */ /* Extract the architecture version on pre-cpuid scheme */
} else { } else {