linux-kernel - [PATCH 6/6] x86/intel_rdt: Turn on/off L2 CDP in kernel parameter

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Date:   Wed, 20 Dec 2017 14:57:24 -0800
From:   "Fenghua Yu" <fenghua.yu@...el.com>
To:     "Thomas Gleixner" <tglx@...utronix.de>,
        "Ingo Molnar" <mingo@...e.hu>,
        "H. Peter Anvin" <hpa@...ux.intel.com>,
        "Tony Luck" <tony.luck@...el.com>,
        "Shivappa, Vikas" <vikas.shivappa@...el.com>,
        "Ravi V Shankar" <ravi.v.shankar@...el.com>,
        "Prakhya, Sai Praneeth" <sai.praneeth.prakhya@...el.com>,
        "Chatre, Reinette" <reinette.chatre@...el.com>,
        "linux-kernel" <linux-kernel@...r.kernel.org>,
        "x86" <x86@...nel.org>
Cc:     Fenghua Yu <fenghua.yu@...el.com>
Subject: [PATCH 6/6] x86/intel_rdt: Turn on/off L2 CDP in kernel parameter

From: Fenghua Yu <fenghua.yu@...el.com>

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 <fenghua.yu@...el.com>
---
 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