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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>,
	Linus Walleij <linus.walleij@linaro.org>,
	Amit Daniel Kachhap <amit.kachhap@arm.com>
Subject: [PATCH v2 6/7] arm64: Add compat hwcap SB
Date: Wed, 11 Jan 2023 11:07:05 +0530	[thread overview]
Message-ID: <20230111053706.13994-7-amit.kachhap@arm.com> (raw)
In-Reply-To: <20230111053706.13994-1-amit.kachhap@arm.com>

This hwcap was added for 32-bit native arm kernel by commit
3bda6d884897 ("ARM: 9273/1: Add hwcap for Speculation Barrier(SB)")
and hence the corresponding changes added in 32-bit compat arm64 kernel.

Speculation Barrier is a feature(FEAT_SB) present in both AArch32 and
AArch64 state. This hwcap is already advertised in native 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 da7687efd1ae..f2bcf4255f97 100644
--- a/arch/arm64/include/asm/hwcap.h
+++ b/arch/arm64/include/asm/hwcap.h
@@ -43,6 +43,7 @@
 #define COMPAT_HWCAP2_SHA1	(1 << 2)
 #define COMPAT_HWCAP2_SHA2	(1 << 3)
 #define COMPAT_HWCAP2_CRC32	(1 << 4)
+#define COMPAT_HWCAP2_SB	(1 << 5)
 
 #ifndef __ASSEMBLY__
 #include <linux/log2.h>
diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index 46998bbba6ff..8adbafbdf1da 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -532,7 +532,7 @@ static const struct arm64_ftr_bits ftr_id_isar6[] = {
 	ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR6_EL1_I8MM_SHIFT, 4, 0),
 	ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR6_EL1_BF16_SHIFT, 4, 0),
 	ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR6_EL1_SPECRES_SHIFT, 4, 0),
-	ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR6_EL1_SB_SHIFT, 4, 0),
+	ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR6_EL1_SB_SHIFT, 4, 0),
 	ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR6_EL1_FHM_SHIFT, 4, 0),
 	ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR6_EL1_DP_SHIFT, 4, 0),
 	ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR6_EL1_JSCVT_SHIFT, 4, 0),
@@ -2875,6 +2875,7 @@ static const struct arm64_cpu_capabilities compat_elf_hwcaps[] = {
 	HWCAP_CAP(SYS_ID_ISAR5_EL1, ID_ISAR5_EL1_CRC32_SHIFT, 4, FTR_UNSIGNED, 1, CAP_COMPAT_HWCAP2, COMPAT_HWCAP2_CRC32),
 	HWCAP_CAP(SYS_ID_ISAR6_EL1, ID_ISAR6_EL1_DP_SHIFT, 4, FTR_UNSIGNED, 1, CAP_COMPAT_HWCAP, COMPAT_HWCAP_ASIMDDP),
 	HWCAP_CAP(SYS_ID_ISAR6_EL1, ID_ISAR6_EL1_FHM_SHIFT, 4, FTR_UNSIGNED, 1, CAP_COMPAT_HWCAP, COMPAT_HWCAP_ASIMDFHM),
+	HWCAP_CAP(SYS_ID_ISAR6_EL1, ID_ISAR6_EL1_SB_SHIFT, 4, FTR_UNSIGNED, 1, CAP_COMPAT_HWCAP2, COMPAT_HWCAP2_SB),
 	HWCAP_CAP(SYS_ID_ISAR6_EL1, ID_ISAR6_EL1_BF16_SHIFT, 4, FTR_UNSIGNED, 1, CAP_COMPAT_HWCAP, COMPAT_HWCAP_ASIMDBF16),
 	HWCAP_CAP(SYS_ID_ISAR6_EL1, ID_ISAR6_EL1_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 2af73bc14775..d2b41f2544f5 100644
--- a/arch/arm64/kernel/cpuinfo.c
+++ b/arch/arm64/kernel/cpuinfo.c
@@ -161,6 +161,7 @@ static const char *const compat_hwcap2_str[] = {
 	[COMPAT_KERNEL_HWCAP2(SHA1)]	= "sha1",
 	[COMPAT_KERNEL_HWCAP2(SHA2)]	= "sha2",
 	[COMPAT_KERNEL_HWCAP2(CRC32)]	= "crc32",
+	[COMPAT_KERNEL_HWCAP2(SB)]	= "sb",
 };
 #endif /* CONFIG_COMPAT */
 
-- 
2.17.1


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  parent reply	other threads:[~2023-01-11  5:39 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-01-11  5:36 [PATCH v2 0/7] arm64: Expose compat Armv8 AArch32 features Amit Daniel Kachhap
2023-01-11  5:37 ` [PATCH v2 1/7] arm64: Add compat hwcap FPHP and ASIMDHP Amit Daniel Kachhap
2023-01-11 20:07   ` Mark Brown
2023-01-11  5:37 ` [PATCH v2 2/7] arm64: Add compat hwcap ASIMDDP Amit Daniel Kachhap
2023-01-11 20:11   ` Mark Brown
2023-01-11  5:37 ` [PATCH v2 3/7] arm64: Add compat hwcap ASIMDFHM Amit Daniel Kachhap
2023-01-19 15:02   ` Mark Brown
2023-01-11  5:37 ` [PATCH v2 4/7] arm64: Add compat hwcap ASIMDBF16 Amit Daniel Kachhap
2023-01-19 15:03   ` Mark Brown
2023-01-11  5:37 ` [PATCH v2 5/7] arm64: Add compat hwcap I8MM Amit Daniel Kachhap
2023-01-19 15:04   ` Mark Brown
2023-01-11  5:37 ` Amit Daniel Kachhap [this message]
2023-01-19 15:06   ` [PATCH v2 6/7] arm64: Add compat hwcap SB Mark Brown
2023-01-11  5:37 ` [PATCH v2 7/7] arm64: Add compat hwcap SSBS Amit Daniel Kachhap
2023-01-19 15:06   ` Mark Brown
2023-01-11 13:49 ` [PATCH v2 0/7] arm64: Expose compat Armv8 AArch32 features Mark Brown
2023-01-12  5:12   ` Amit Daniel Kachhap
2023-01-20 16:58 ` Catalin Marinas

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