linux-kernel - [PATCH 3.18 27/56] tools/power turbostat: Read extended processor family from CPUID

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Message-Id: <20180903164925.442941866@linuxfoundation.org>
Date:   Mon,  3 Sep 2018 18:49:17 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Calvin Walton <calvin.walton@...stin.ca>,
        Len Brown <len.brown@...el.com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 3.18 27/56] tools/power turbostat: Read extended processor family from CPUID

3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Calvin Walton <calvin.walton@...stin.ca>

[ Upstream commit 5aa3d1a20a233d4a5f1ec3d62da3f19d9afea682 ]

This fixes the reported family on modern AMD processors (e.g. Ryzen,
which is family 0x17). Previously these processors all showed up as
family 0xf.

See the document
https://support.amd.com/TechDocs/56255_OSRR.pdf
section CPUID_Fn00000001_EAX for how to calculate the family
from the BaseFamily and ExtFamily values.

This matches the code in arch/x86/lib/cpu.c

Signed-off-by: Calvin Walton <calvin.walton@...stin.ca>
Signed-off-by: Len Brown <len.brown@...el.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 tools/power/x86/turbostat/turbostat.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/tools/power/x86/turbostat/turbostat.c
+++ b/tools/power/x86/turbostat/turbostat.c
@@ -2009,7 +2009,9 @@ void check_cpuid()
 	family = (fms >> 8) & 0xf;
 	model = (fms >> 4) & 0xf;
 	stepping = fms & 0xf;
-	if (family == 6 || family == 0xf)
+	if (family == 0xf)
+		family += (fms >> 20) & 0xff;
+	if (family >= 6)
 		model += ((fms >> 16) & 0xf) << 4;
 
 	if (verbose)