linux-kernel - [PATCH] x86/cpufeatures: Enable new AVX512 cpu features

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Date:   Tue,  8 Nov 2016 16:08:44 -0800
From:   Gayatri Kammela <gayatri.kammela@...el.com>
To:     mingo@...e.hu
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        Gayatri Kammela <gayatri.kammela@...el.com>,
        "H . Peter Anvin" <hpa@...ux.intel.com>,
        Ravi Shankar <ravi.v.shankar@...el.com>,
        Fenghua Yu <fenghua.yu@...el.com>
Subject: [PATCH] x86/cpufeatures: Enable new AVX512 cpu features

Modify cpufeatures.h to add new AVX512 instruction groups/features
for enuermation in /proc/cpuinfo: AVX512IFMA and AVX512VBMI

Also modify the xstate.c to clear the flags in
fpu__xstate_clear_all_cpu_caps().

CPUID.(EAX=7,ECX=0):EBX[bit 21] AVX512IFMA
CPUID.(Eax=7,ECX=0):ECX[bit 1]  AVX512VBMI

Detailed information of cpuid bits for the features can be found in
Intel Architecture Instruction Set Extensions Programming Reference.

Cc: H. Peter Anvin <hpa@...ux.intel.com>
Cc: Ravi Shankar <ravi.v.shankar@...el.com>
Cc: Fenghua Yu <fenghua.yu@...el.com>
Signed-off-by: Gayatri Kammela <gayatri.kammela@...el.com>
---
 arch/x86/include/asm/cpufeatures.h | 2 ++
 arch/x86/kernel/fpu/xstate.c       | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h
index 4a413485f9eb..c722fcc18a15 100644
--- a/arch/x86/include/asm/cpufeatures.h
+++ b/arch/x86/include/asm/cpufeatures.h
@@ -225,6 +225,7 @@
 #define X86_FEATURE_RDSEED	( 9*32+18) /* The RDSEED instruction */
 #define X86_FEATURE_ADX		( 9*32+19) /* The ADCX and ADOX instructions */
 #define X86_FEATURE_SMAP	( 9*32+20) /* Supervisor Mode Access Prevention */
+#define X86_FEATURE_AVX512IFMA  ( 9*32+21) /* AVX-512 Integer Fused Multiply-Add instructions */
 #define X86_FEATURE_PCOMMIT	( 9*32+22) /* PCOMMIT instruction */
 #define X86_FEATURE_CLFLUSHOPT	( 9*32+23) /* CLFLUSHOPT instruction */
 #define X86_FEATURE_CLWB	( 9*32+24) /* CLWB instruction */
@@ -279,6 +280,7 @@
 #define X86_FEATURE_AVIC	(15*32+13) /* Virtual Interrupt Controller */
 
 /* Intel-defined CPU features, CPUID level 0x00000007:0 (ecx), word 16 */
+#define X86_FEATURE_AVX512VBMI  (16*32+ 1) /* AVX512 Vector Bit Manipulation instructions*/
 #define X86_FEATURE_PKU		(16*32+ 3) /* Protection Keys for Userspace */
 #define X86_FEATURE_OSPKE	(16*32+ 4) /* OS Protection Keys Enable */
 
diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c
index 4ea2a59483c7..92411568e320 100644
--- a/arch/x86/kernel/fpu/xstate.c
+++ b/arch/x86/kernel/fpu/xstate.c
@@ -56,6 +56,7 @@ void fpu__xstate_clear_all_cpu_caps(void)
 	setup_clear_cpu_cap(X86_FEATURE_AVX);
 	setup_clear_cpu_cap(X86_FEATURE_AVX2);
 	setup_clear_cpu_cap(X86_FEATURE_AVX512F);
+	setup_clear_cpu_cap(X86_FEATURE_AVX512IFMA);
 	setup_clear_cpu_cap(X86_FEATURE_AVX512PF);
 	setup_clear_cpu_cap(X86_FEATURE_AVX512ER);
 	setup_clear_cpu_cap(X86_FEATURE_AVX512CD);
@@ -64,6 +65,7 @@ void fpu__xstate_clear_all_cpu_caps(void)
 	setup_clear_cpu_cap(X86_FEATURE_AVX512VL);
 	setup_clear_cpu_cap(X86_FEATURE_MPX);
 	setup_clear_cpu_cap(X86_FEATURE_XGETBV1);
+	setup_clear_cpu_cap(X86_FEATURE_AVX512VBMI);
 	setup_clear_cpu_cap(X86_FEATURE_PKU);
 }
 
-- 
2.7.4