From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756872AbdLTWzX (ORCPT ); Wed, 20 Dec 2017 17:55:23 -0500 Received: from mga03.intel.com ([134.134.136.65]:22024 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755711AbdLTWyn (ORCPT ); Wed, 20 Dec 2017 17:54:43 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.45,433,1508828400"; d="scan'208";a="14007868" From: "Fenghua Yu" To: "Thomas Gleixner" , "Ingo Molnar" , "H. Peter Anvin" , "Tony Luck" , "Shivappa, Vikas" , "Ravi V Shankar" , "Prakhya, Sai Praneeth" , "Chatre, Reinette" , "linux-kernel" , "x86" Cc: Fenghua Yu Subject: [PATCH 6/6] x86/intel_rdt: Turn on/off L2 CDP in kernel parameter Date: Wed, 20 Dec 2017 14:57:24 -0800 Message-Id: <1513810644-78015-7-git-send-email-fenghua.yu@intel.com> X-Mailer: git-send-email 2.5.0 In-Reply-To: <1513810644-78015-1-git-send-email-fenghua.yu@intel.com> References: <1513810644-78015-1-git-send-email-fenghua.yu@intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Fenghua Yu L2 CDP can be turned on or off by kernel parameter "rdt=". If "rdt=l2cdp", L2 CDP is turned on. If "rdt=!l2cdp", L2 CDP is turned off. Signed-off-by: Fenghua Yu --- Documentation/admin-guide/kernel-parameters.txt | 3 ++- arch/x86/kernel/cpu/intel_rdt.c | 2 ++ 2 files changed, 4 insertions(+), 1 deletion(-) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 0549662..077eebc 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -3623,7 +3623,8 @@ rdt= [HW,X86,RDT] Turn on/off individual RDT features. List is: - cmt, mbmtotal, mbmlocal, l3cat, l3cdp, l2cat, mba. + cmt, mbmtotal, mbmlocal, l3cat, l3cdp, l2cat, l2cdp, + mba. E.g. to turn on cmt and turn off mba use: rdt=cmt,!mba diff --git a/arch/x86/kernel/cpu/intel_rdt.c b/arch/x86/kernel/cpu/intel_rdt.c index a739a32..25cfb17 100644 --- a/arch/x86/kernel/cpu/intel_rdt.c +++ b/arch/x86/kernel/cpu/intel_rdt.c @@ -691,6 +691,7 @@ enum { RDT_FLAG_L3_CAT, RDT_FLAG_L3_CDP, RDT_FLAG_L2_CAT, + RDT_FLAG_L2_CDP, RDT_FLAG_MBA, }; @@ -713,6 +714,7 @@ struct rdt_options { RDT_OPT(RDT_FLAG_L3_CAT, "l3cat", X86_FEATURE_CAT_L3), RDT_OPT(RDT_FLAG_L3_CDP, "l3cdp", X86_FEATURE_CDP_L3), RDT_OPT(RDT_FLAG_L2_CAT, "l2cat", X86_FEATURE_CAT_L2), + RDT_OPT(RDT_FLAG_L2_CDP, "l2cdp", X86_FEATURE_CDP_L2), RDT_OPT(RDT_FLAG_MBA, "mba", X86_FEATURE_MBA), }; #define NUM_RDT_OPTIONS ARRAY_SIZE(rdt_options) -- 1.8.3.1