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From: Ricardo Neri <ricardo.neri-calderon@linux.intel.com>
To: x86@kernel.org, Borislav Petkov <bp@suse.de>,
	Ingo Molnar <mingo@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>
Cc: Len Brown <len.brown@intel.com>,
	"Ravi V. Shankar" <ravi.v.shankar@intel.com>,
	linux-kernel@vger.kernel.org, Andy Lutomirski <luto@kernel.org>,
	Tony Luck <tony.luck@intel.com>,
	"Peter Zijlstra (Intel)" <peterz@infradead.org>,
	Ricardo Neri <ricardo.neri-calderon@linux.intel.com>
Subject: [PATCH 0/3] x86: Add initial support to discover Intel hybrid CPUs
Date: Fri,  2 Oct 2020 13:19:28 -0700	[thread overview]
Message-ID: <20201002201931.2826-1-ricardo.neri-calderon@linux.intel.com> (raw)

Add support to discover and enumerate CPUs in Intel hybrid parts. A hybrid
part has CPUs with more than one type of micro-architecture. Thus, certain
features may only be present in a specific CPU type.

It is useful to know the type of CPUs present in a system. For instance,
perf may need to handle CPUs differently depending on the type of micro-
architecture. Decoding machine check error logs may need the additional
micro-architecture type information, so include that in the log.

A hybrid part can be identified by reading a new CPUID feature bit.
Likewise, CPUID contains information about the CPU type as well as a new
native model ID. Details can be found in the Intel manual (SDM, [1]).

This series adds support for Intel hybrid parts in two areas: a) adding
the hybrid feature bit as well as struct cpuinfo_x86; and b) decode machine
check errors on hybrid parts.

A later submission will use the proposed functionality to expose the CPU
topology to user space.

Thanks and BR,
Ricardo

[1].
https://software.intel.com/content/dam/develop/public/us/en/documents/325462-sdm-vol-1-2abcd-3abcd.pdf
Vol 2. Section 3.2.CPUID leaf 0x1a

Ricardo Neri (3):
  x86/cpufeatures: Enumerate hybrid CPU feature bit
  x86/cpu: Describe hybrid CPUs in cpuinfo_x86
  x86/mce: include type of core when reporting a machine check error

 arch/x86/include/asm/cpufeatures.h |  1 +
 arch/x86/include/asm/processor.h   | 13 +++++++++++++
 arch/x86/include/uapi/asm/mce.h    |  1 +
 arch/x86/kernel/cpu/common.c       |  5 +++++
 arch/x86/kernel/cpu/mce/core.c     |  7 +++++++
 5 files changed, 27 insertions(+)

-- 
2.17.1


             reply	other threads:[~2020-10-02 20:17 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-02 20:19 Ricardo Neri [this message]
2020-10-02 20:19 ` [PATCH 1/3] x86/cpufeatures: Enumerate hybrid CPU feature bit Ricardo Neri
2020-10-02 20:19 ` [PATCH 2/3] x86/cpu: Describe hybrid CPUs in cpuinfo_x86 Ricardo Neri
2020-10-02 20:34   ` Borislav Petkov
2020-10-02 21:02     ` Ricardo Neri
2020-10-02 21:03       ` Borislav Petkov
2020-10-02 23:41         ` Ricardo Neri
2020-10-02 20:19 ` [PATCH 3/3] x86/mce: include type of core when reporting a machine check error Ricardo Neri
2020-10-03  1:39 ` [PATCH 0/3] x86: Add initial support to discover Intel hybrid CPUs Thomas Gleixner
2020-10-03  2:17   ` Luck, Tony
2020-10-03  9:04     ` Borislav Petkov
2020-10-06  0:24       ` Ricardo Neri
2020-10-03 10:46     ` Thomas Gleixner
2020-10-03 14:39       ` Peter Zijlstra
2020-10-06  0:21       ` Ricardo Neri

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