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authorAmit Daniel Kachhap <amit.kachhap@arm.com>2022-11-17 08:58:31 +0300
committerRussell King (Oracle) <rmk+kernel@armlinux.org.uk>2022-11-28 14:57:34 +0300
commit956ca3a4eb81c1b8cc3226af3083847544dcb098 (patch)
tree85ca472cbbdea50bcd6d191bc04b85a3c454af75
parent23b6d4ad6e7a3028dd88aff7e2b0e5a81da8565e (diff)
downloadlinux-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.h1
-rw-r--r--arch/arm/kernel/setup.c1
-rw-r--r--arch/arm/vfp/vfpmodule.c6
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 {