[PATCH v2 2/7] arm64: Add compat hwcap ASIMDDP

[Amit Daniel Kachhap]

This hwcap was added earlier for 32-bit native arm kernel by commit
62ea0d873af3 ("ARM: 9269/1: vfp: Add hwcap for FEAT_DotProd") and hence the
corresponding changes added in 32-bit compat arm64 kernel for similar user
interfaces.

Advanced Dot product is a feature (FEAT_DotProd) present in both
AArch32/AArch64 state for Armv8 and is already advertised in native arm64
kernel.

Signed-off-by: Amit Daniel Kachhap <amit.kachhap at 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 8d0d412aba3c..d3d8a992ab05 100644
--- a/arch/arm64/include/asm/hwcap.h
+++ b/arch/arm64/include/asm/hwcap.h
@@ -33,6 +33,7 @@
 #define COMPAT_HWCAP_EVTSTRM	(1 << 21)
 #define COMPAT_HWCAP_FPHP	(1 << 22)
 #define COMPAT_HWCAP_ASIMDHP	(1 << 23)
+#define COMPAT_HWCAP_ASIMDDP	(1 << 24)
 
 #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 4c589ff7e5ea..e213a3fcbb9b 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -534,7 +534,7 @@ static const struct arm64_ftr_bits ftr_id_isar6[] = {
 	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_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR6_EL1_FHM_SHIFT, 4, 0),
-	ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR6_EL1_DP_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),
 	ARM64_FTR_END,
 };
@@ -2873,6 +2873,7 @@ static const struct arm64_cpu_capabilities compat_elf_hwcaps[] = {
 	HWCAP_CAP(SYS_ID_ISAR5_EL1, ID_ISAR5_EL1_SHA1_SHIFT, 4, FTR_UNSIGNED, 1, CAP_COMPAT_HWCAP2, COMPAT_HWCAP2_SHA1),
 	HWCAP_CAP(SYS_ID_ISAR5_EL1, ID_ISAR5_EL1_SHA2_SHIFT, 4, FTR_UNSIGNED, 1, CAP_COMPAT_HWCAP2, COMPAT_HWCAP2_SHA2),
 	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),
 #endif
 	{},
 };
diff --git a/arch/arm64/kernel/cpuinfo.c b/arch/arm64/kernel/cpuinfo.c
index 195b44a99f5d..e94eb1a4f1f4 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(EVTSTRM)]	= "evtstrm",
 	[COMPAT_KERNEL_HWCAP(FPHP)]	= "fphp",
 	[COMPAT_KERNEL_HWCAP(ASIMDHP)]	= "asimdhp",
+	[COMPAT_KERNEL_HWCAP(ASIMDDP)]	= "asimddp",
 };
 
 #define COMPAT_KERNEL_HWCAP2(x)	const_ilog2(COMPAT_HWCAP2_ ## x)
-- 
2.17.1