From: Amit Daniel Kachhap <amit.kachhap@arm.com>
To: Russell King <linux@armlinux.org.uk>
Cc: patches@armlinux.org.uk, linux-arm-kernel@lists.infradead.org,
Amit Daniel Kachhap <amit.kachhap@arm.com>
Subject: [PATCH 6/8] ARM: vfp: Add hwcap for FEAT_AA32I8MM
Date: Wed, 26 Oct 2022 11:19:59 +0530 [thread overview]
Message-ID: <20221026055001.12986-7-amit.kachhap@arm.com> (raw)
In-Reply-To: <20221026055001.12986-1-amit.kachhap@arm.com>
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.
Signed-off-by: Amit Daniel Kachhap <amit.kachhap@arm.com>
---
arch/arm/include/uapi/asm/hwcap.h | 1 +
arch/arm/kernel/setup.c | 1 +
arch/arm/vfp/vfpmodule.c | 6 ++++++
3 files changed, 8 insertions(+)
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 231d885ad4b5..de2d85ddec8d 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 {
--
2.17.1
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next prev parent reply other threads:[~2022-10-26 5:52 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-26 5:49 [PATCH 0/8] ARM: Expose Armv8 AArch32 features via hwcap Amit Daniel Kachhap
2022-10-26 5:49 ` [PATCH 1/8] ARM: Define Armv8 registers in AArch32 state Amit Daniel Kachhap
2022-10-26 5:49 ` [PATCH 2/8] ARM: vfp: Add hwcap FPHP and ASIMDHP for FEAT_FP16 Amit Daniel Kachhap
2022-10-26 5:49 ` [PATCH 3/8] ARM: vfp: Add hwcap for FEAT_DotProd Amit Daniel Kachhap
2022-10-26 5:49 ` [PATCH 4/8] ARM: vfp: Add hwcap for FEAT_FHM Amit Daniel Kachhap
2022-10-26 5:49 ` [PATCH 5/8] ARM: vfp: Add hwcap for FEAT_AA32BF16 Amit Daniel Kachhap
2022-10-26 5:49 ` Amit Daniel Kachhap [this message]
2022-10-26 5:50 ` [PATCH 7/8] ARM: Add hwcap for Speculation Barrier(SB) Amit Daniel Kachhap
2022-11-16 14:06 ` Linus Walleij
2022-11-17 10:19 ` Amit Daniel Kachhap
2022-11-17 11:14 ` Robin Murphy
2022-10-26 5:50 ` [PATCH 8/8] ARM: Add hwcap for Speculative Store Bypassing Safe Amit Daniel Kachhap
2022-11-16 13:51 ` [PATCH 0/8] ARM: Expose Armv8 AArch32 features via hwcap Linus Walleij
2022-11-17 6:19 ` Amit Kachhap
2022-11-21 19:04 ` Russell King (Oracle)
2022-11-22 12:24 ` Amit Daniel Kachhap
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