x86/intel_rdt: Enable CMT and MBM on new Skylake stepping

commit 1d9f3e20a56d33e55748552aeec597f58542f92d upstream.

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
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/x86/kernel/cpu/intel_rdt.c b/arch/x86/kernel/cpu/intel_rdt.c
index 589b948e6e01f01d7388cca456fbecd6019dbca4..316a8875bd9061207a22eb9de0658a03249a131d 100644 (file)
--- 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");
        }
 }