linux-kernel - [PATCH 1/2] turbostat: Read extended processor family from CPUID

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Date:   Tue, 17 Jul 2018 21:36:41 -0400
From:   Calvin Walton <calvin.walton@...stin.ca>
To:     linux-kernel@...r.kernel.org,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Len Brown <len.brown@...el.com>
Cc:     Calvin Walton <calvin.walton@...stin.ca>
Subject: [PATCH 1/2] turbostat: Read extended processor family from CPUID

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.
---
 tools/power/x86/turbostat/turbostat.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/power/x86/turbostat/turbostat.c b/tools/power/x86/turbostat/turbostat.c
index bd9c6b31a504..f404d67fda92 100644
--- a/tools/power/x86/turbostat/turbostat.c
+++ b/tools/power/x86/turbostat/turbostat.c
@@ -4031,7 +4031,9 @@ void process_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 || family >= 0xf)
 		model += ((fms >> 16) & 0xf) << 4;
 
 	if (!quiet) {
-- 
2.18.0