From 1d9f3e20a56d33e55748552aeec597f58542f92d Mon Sep 17 00:00:00 2001
From: Tony Luck <tony.luck@intel.com>
Date: Fri, 8 Jun 2018 09:07:32 -0700
Subject: [PATCH] x86/intel_rdt: Enable CMT and MBM on new Skylake stepping
New stepping of Skylake has fixes for cache occupancy and memory
bandwidth monitoring.
Update the code to enable these by default on newer steppings.
Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: stable@vger.kernel.org # v4.14
Cc: Vikas Shivappa <vikas.shivappa@linux.intel.com>
Link: https://lkml.kernel.org/r/20180608160732.9842-1-tony.luck@intel.com
---
arch/x86/kernel/cpu/intel_rdt.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/x86/kernel/cpu/intel_rdt.c b/arch/x86/kernel/cpu/intel_rdt.c
index 589b948e6e01f..316a8875bd906 100644
--- a/arch/x86/kernel/cpu/intel_rdt.c
+++ b/arch/x86/kernel/cpu/intel_rdt.c
@@ -821,6 +821,8 @@ static __init void rdt_quirks(void)
case INTEL_FAM6_SKYLAKE_X:
if (boot_cpu_data.x86_stepping <= 4)
set_rdt_options("!cmt,!mbmtotal,!mbmlocal,!l3cat");
+ else
+ set_rdt_options("!l3cat");
}
}
--
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