linux-kernel - [tip: perf/core] x86/cpufeatures: Enumerate Intel Hybrid Technology feature bit

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Date:   Tue, 20 Apr 2021 10:46:49 -0000
From:   "tip-bot2 for Ricardo Neri" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Tony Luck <tony.luck@...el.com>,
        Len Brown <len.brown@...el.com>, Borislav Petkov <bp@...e.de>,
        x86@...nel.org, linux-kernel@...r.kernel.org
Subject: [tip: perf/core] x86/cpufeatures: Enumerate Intel Hybrid Technology
 feature bit

The following commit has been merged into the perf/core branch of tip:

Commit-ID:     a161545ab53b174c016b0eb63c2895266665d2f6
Gitweb:        https://git.kernel.org/tip/a161545ab53b174c016b0eb63c2895266665d2f6
Author:        Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
AuthorDate:    Mon, 12 Apr 2021 07:30:41 -07:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Mon, 19 Apr 2021 20:03:23 +02:00

x86/cpufeatures: Enumerate Intel Hybrid Technology feature bit

Add feature enumeration to identify a processor with Intel Hybrid
Technology: one in which CPUs of more than one type are the same package.
On a hybrid processor, all CPUs support the same homogeneous (i.e.,
symmetric) instruction set. All CPUs enumerate the same features in CPUID.
Thus, software (user space and kernel) can run and migrate to any CPU in
the system as well as utilize any of the enumerated features without any
change or special provisions. The main difference among CPUs in a hybrid
processor are power and performance properties.

Signed-off-by: Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Reviewed-by: Tony Luck <tony.luck@...el.com>
Reviewed-by: Len Brown <len.brown@...el.com>
Acked-by: Borislav Petkov <bp@...e.de>
Link: https://lkml.kernel.org/r/1618237865-33448-2-git-send-email-kan.liang@linux.intel.com
---
 arch/x86/include/asm/cpufeatures.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h
index cc96e26..1ba4a6e 100644
--- a/arch/x86/include/asm/cpufeatures.h
+++ b/arch/x86/include/asm/cpufeatures.h
@@ -374,6 +374,7 @@
 #define X86_FEATURE_MD_CLEAR		(18*32+10) /* VERW clears CPU buffers */
 #define X86_FEATURE_TSX_FORCE_ABORT	(18*32+13) /* "" TSX_FORCE_ABORT */
 #define X86_FEATURE_SERIALIZE		(18*32+14) /* SERIALIZE instruction */
+#define X86_FEATURE_HYBRID_CPU		(18*32+15) /* "" This part has CPUs of more than one type */
 #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 */