diff options
| author | Amit Daniel Kachhap <amit.kachhap@arm.com> | 2022-11-17 06:32:56 +0100 |
|---|---|---|
| committer | Russell King (Oracle) <rmk+kernel@armlinux.org.uk> | 2022-11-28 11:57:32 +0000 |
| commit | 62ea0d873af3ef0a7e8387b67241ad43e3d377e1 (patch) | |
| tree | 3cd591893eb1559452c8d2a72619434236b1268d | |
| parent | c00a19c8b143db31d660ee965e6a6f782ef090ff (diff) | |
ARM: 9269/1: vfp: Add hwcap for FEAT_DotProd
Advanced Dot product is a feature present in AArch32 state for Armv8 and
is represented by ISAR6 identification register.
This feature denotes the presence of UDOT and SDOT 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.h | 1 | ||||
| -rw-r--r-- | arch/arm/kernel/setup.c | 1 | ||||
| -rw-r--r-- | arch/arm/vfp/vfpmodule.c | 10 |
3 files changed, 12 insertions, 0 deletions
diff --git a/arch/arm/include/uapi/asm/hwcap.h b/arch/arm/include/uapi/asm/hwcap.h index 8b6f690f0ac4..64f3608e6f1b 100644 --- a/arch/arm/include/uapi/asm/hwcap.h +++ b/arch/arm/include/uapi/asm/hwcap.h @@ -30,6 +30,7 @@ #define HWCAP_EVTSTRM (1 << 21) #define HWCAP_FPHP (1 << 22) #define HWCAP_ASIMDHP (1 << 23) +#define HWCAP_ASIMDDP (1 << 24) /* * 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 870e5d5c5b5b..9841b897d476 100644 --- a/arch/arm/kernel/setup.c +++ b/arch/arm/kernel/setup.c @@ -1251,6 +1251,7 @@ static const char *hwcap_str[] = { "evtstrm", "fphp", "asimdhp", + "asimddp", NULL }; diff --git a/arch/arm/vfp/vfpmodule.c b/arch/arm/vfp/vfpmodule.c index 55dcd96c7e3b..70f1e0f4eece 100644 --- a/arch/arm/vfp/vfpmodule.c +++ b/arch/arm/vfp/vfpmodule.c @@ -774,6 +774,7 @@ static int __init vfp_init(void) { unsigned int vfpsid; unsigned int cpu_arch = cpu_architecture(); + unsigned int isar6; /* * Enable the access to the VFP on all online CPUs so the @@ -836,6 +837,15 @@ static int __init vfp_init(void) if (((fmrx(MVFR1) & MVFR1_FPHP_MASK) >> MVFR1_FPHP_BIT) == 0x3) elf_hwcap |= HWCAP_FPHP; } + + /* + * Check for the presence of Advanced SIMD Dot Product + * instructions. + */ + isar6 = read_cpuid_ext(CPUID_EXT_ISAR6); + if (cpuid_feature_extract_field(isar6, 4) == 0x1) + elf_hwcap |= HWCAP_ASIMDDP; + /* Extract the architecture version on pre-cpuid scheme */ } else { if (vfpsid & FPSID_NODOUBLE) { |