[PATCH 4.16 56/64] x86/intel_rdt: Enable CMT and MBM on new Skylake stepping

[Greg Kroah-Hartman]

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

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

From: Tony Luck <tony.luck@xxxxxxxxx>

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@xxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Fenghua Yu <fenghua.yu@xxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx # v4.14
Cc: Vikas Shivappa <vikas.shivappa@xxxxxxxxxxxxxxx>
Link: https://lkml.kernel.org/r/20180608160732.9842-1-tony.luck@xxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 arch/x86/kernel/cpu/intel_rdt.c |    2 ++
 1 file changed, 2 insertions(+)

--- 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");
 	}
 }