Messages in this thread Patch in this message |  | | From | "Chang S. Bae" <> | Subject | [PATCH v5 19/28] x86/cpufeatures/amx: Enumerate Advanced Matrix Extension (AMX) feature bits | Date | Sun, 23 May 2021 12:32:50 -0700 |
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Intel's Advanced Matrix Extension (AMX) is a new 64-bit extended feature consisting of two-dimensional registers and an accelerator unit. The first implementation of the latter is the tile matrix multiply unit (TMUL). TMUL performs SIMD dot-products on four bytes (INT8) or two bfloat16 floating-point (BF16) elements.
Here enumerate this hardware capability to be shown as 'amx_tile', 'amx_bf16', and 'amx_int8' in /proc/cpuinfo.
Signed-off-by: Chang S. Bae <chang.seok.bae@intel.com> Reviewed-by: Len Brown <len.brown@intel.com> Cc: x86@kernel.org Cc: linux-kernel@vger.kernel.org --- Changes from v4: * Massaged the changelog a bit. --- arch/x86/include/asm/cpufeatures.h | 3 +++ arch/x86/kernel/cpu/cpuid-deps.c | 3 +++ 2 files changed, 6 insertions(+)
diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h index 67a9e5282128..a4fb3ca76929 100644 --- a/arch/x86/include/asm/cpufeatures.h +++ b/arch/x86/include/asm/cpufeatures.h @@ -385,7 +385,10 @@ #define X86_FEATURE_TSXLDTRK (18*32+16) /* TSX Suspend Load Address Tracking */ #define X86_FEATURE_PCONFIG (18*32+18) /* Intel PCONFIG */ #define X86_FEATURE_ARCH_LBR (18*32+19) /* Intel ARCH LBR */ +#define X86_FEATURE_AMX_BF16 (18*32+22) /* AMX BF16 Support */ #define X86_FEATURE_AVX512_FP16 (18*32+23) /* AVX512 FP16 */ +#define X86_FEATURE_AMX_TILE (18*32+24) /* AMX tile Support */ +#define X86_FEATURE_AMX_INT8 (18*32+25) /* AMX INT8 Support */ #define X86_FEATURE_SPEC_CTRL (18*32+26) /* "" Speculation Control (IBRS + IBPB) */ #define X86_FEATURE_INTEL_STIBP (18*32+27) /* "" Single Thread Indirect Branch Predictors */ #define X86_FEATURE_FLUSH_L1D (18*32+28) /* Flush L1D cache */ diff --git a/arch/x86/kernel/cpu/cpuid-deps.c b/arch/x86/kernel/cpu/cpuid-deps.c index 7f891d2eb52e..9a520ab259ac 100644 --- a/arch/x86/kernel/cpu/cpuid-deps.c +++ b/arch/x86/kernel/cpu/cpuid-deps.c @@ -76,6 +76,9 @@ static const struct cpuid_dep cpuid_deps[] = { { X86_FEATURE_SGX1, X86_FEATURE_SGX }, { X86_FEATURE_SGX2, X86_FEATURE_SGX1 }, { X86_FEATURE_XFD, X86_FEATURE_XSAVE }, + { X86_FEATURE_AMX_TILE, X86_FEATURE_XSAVE }, + { X86_FEATURE_AMX_INT8, X86_FEATURE_AMX_TILE }, + { X86_FEATURE_AMX_BF16, X86_FEATURE_AMX_TILE }, {} }; -- 2.17.1
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