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From: Amit Daniel Kachhap <amit.kachhap@arm.com>
To: linux-arm-kernel@lists.infradead.org
Cc: Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	Amit Daniel Kachhap <amit.kachhap@arm.com>
Subject: [PATCH 6/8] arm64: Add compat hwcap I8MM
Date: Wed, 26 Oct 2022 11:28:11 +0530	[thread overview]
Message-ID: <20221026055813.13484-7-amit.kachhap@arm.com> (raw)
In-Reply-To: <20221026055813.13484-1-amit.kachhap@arm.com>

This hwcap is added earlier for 32-bit native arm kernel and hence the
corresponding changes added in 32-bit compat arm64 kernel for similar
user interface. Int8 matrix multiplication is a feature (FEAT_AA32I8MM)
present in AArch32 state of Armv8 and is identified by ISAR6.I8MM register.
Similar feature (FEAT_I8MM) exist for AArch64 state and is already
advertised in arm64 kernel.

Signed-off-by: Amit Daniel Kachhap <amit.kachhap@arm.com>
---
 arch/arm64/include/asm/hwcap.h | 1 +
 arch/arm64/kernel/cpufeature.c | 3 ++-
 arch/arm64/kernel/cpuinfo.c    | 1 +
 3 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/include/asm/hwcap.h b/arch/arm64/include/asm/hwcap.h
index 62e7eadecb30..d2ef58f95b48 100644
--- a/arch/arm64/include/asm/hwcap.h
+++ b/arch/arm64/include/asm/hwcap.h
@@ -36,6 +36,7 @@
 #define COMPAT_HWCAP_ASIMDDP	(1 << 24)
 #define COMPAT_HWCAP_ASIMDFHM	(1 << 25)
 #define COMPAT_HWCAP_ASIMDBF16	(1 << 26)
+#define COMPAT_HWCAP_I8MM	(1 << 27)
 
 #define COMPAT_HWCAP2_AES	(1 << 0)
 #define COMPAT_HWCAP2_PMULL	(1 << 1)
diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index 213f41cb477b..b17c4de13e01 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -527,7 +527,7 @@ static const struct arm64_ftr_bits ftr_id_mmfr5[] = {
 };
 
 static const struct arm64_ftr_bits ftr_id_isar6[] = {
-	ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR6_I8MM_SHIFT, 4, 0),
+	ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR6_I8MM_SHIFT, 4, 0),
 	ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR6_BF16_SHIFT, 4, 0),
 	ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR6_SPECRES_SHIFT, 4, 0),
 	ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR6_SB_SHIFT, 4, 0),
@@ -2852,6 +2852,7 @@ static const struct arm64_cpu_capabilities compat_elf_hwcaps[] = {
 	HWCAP_CAP(SYS_ID_ISAR6_EL1, ID_ISAR6_DP_SHIFT, 4, FTR_UNSIGNED, 1, CAP_COMPAT_HWCAP, COMPAT_HWCAP_ASIMDDP),
 	HWCAP_CAP(SYS_ID_ISAR6_EL1, ID_ISAR6_FHM_SHIFT, 4, FTR_UNSIGNED, 1, CAP_COMPAT_HWCAP, COMPAT_HWCAP_ASIMDFHM),
 	HWCAP_CAP(SYS_ID_ISAR6_EL1, ID_ISAR6_BF16_SHIFT, 4, FTR_UNSIGNED, 1, CAP_COMPAT_HWCAP, COMPAT_HWCAP_ASIMDBF16),
+	HWCAP_CAP(SYS_ID_ISAR6_EL1, ID_ISAR6_I8MM_SHIFT, 4, FTR_UNSIGNED, 1, CAP_COMPAT_HWCAP, COMPAT_HWCAP_I8MM),
 #endif
 	{},
 };
diff --git a/arch/arm64/kernel/cpuinfo.c b/arch/arm64/kernel/cpuinfo.c
index a76e66947bcb..4cb3f089f1ad 100644
--- a/arch/arm64/kernel/cpuinfo.c
+++ b/arch/arm64/kernel/cpuinfo.c
@@ -148,6 +148,7 @@ static const char *const compat_hwcap_str[] = {
 	[COMPAT_KERNEL_HWCAP(ASIMDDP)]	= "asimddp",
 	[COMPAT_KERNEL_HWCAP(ASIMDFHM)]	= "asimdfhm",
 	[COMPAT_KERNEL_HWCAP(ASIMDBF16)]	= "asimdbf16",
+	[COMPAT_KERNEL_HWCAP(I8MM)]		= "i8mm",
 };
 
 #define COMPAT_KERNEL_HWCAP2(x)	const_ilog2(COMPAT_HWCAP2_ ## x)
-- 
2.17.1


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  parent reply	other threads:[~2022-10-26  6:00 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-10-26  5:58 [PATCH 0/8] arm64: Expose compat Armv8 AArch32 features Amit Daniel Kachhap
2022-10-26  5:58 ` [PATCH 1/8] arm64: cpufeature: Fix the visibility of compat hwcaps Amit Daniel Kachhap
2022-10-26 15:15   ` James Morse
2022-11-02 10:47     ` Amit Kachhap
2022-11-01 19:07   ` Catalin Marinas
2022-10-26  5:58 ` [PATCH 2/8] arm64: Add compat hwcap FPHP and ASIMDHP Amit Daniel Kachhap
2022-11-09 18:00   ` Will Deacon
2022-11-10  4:18     ` Amit Kachhap
2022-11-15 15:32       ` Catalin Marinas
2022-10-26  5:58 ` [PATCH 3/8] arm64: Add compat hwcap ASIMDDP Amit Daniel Kachhap
2022-10-26  5:58 ` [PATCH 4/8] arm64: Add compat hwcap ASIMDFHM Amit Daniel Kachhap
2022-10-26  5:58 ` [PATCH 5/8] arm64: Add compat hwcap ASIMDBF16 Amit Daniel Kachhap
2022-10-26  5:58 ` Amit Daniel Kachhap [this message]
2022-10-26  5:58 ` [PATCH 7/8] arm64: Add compat hwcap SB Amit Daniel Kachhap
2022-10-26  5:58 ` [PATCH 8/8] arm64: Add compat hwcap SSBS Amit Daniel Kachhap

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