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

aegl · KAGA-KOKO · commit 1d9f3e20a56d · 2018-06-09T16:04:34.000+02:00
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
diff --git 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");
 	}
 }
 

Original file line number	Diff line number	Diff line change
`@@ -821,6 +821,8 @@ static __init void rdt_quirks(void)`
`821`	`821`	`case INTEL_FAM6_SKYLAKE_X:`
`822`	`822`	`if (boot_cpu_data.x86_stepping <= 4)`
`823`	`823`	`set_rdt_options("!cmt,!mbmtotal,!mbmlocal,!l3cat");`
	`824`	`+ else`
	`825`	`+ set_rdt_options("!l3cat");`
`824`	`826`	`}`
`825`	`827`	`}`
`826`	`828`