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x86/intel_rdt: Add command line parameter to control L2_CDP

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L2 CDP can be controlled 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@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: "Ravi V Shankar" <ravi.v.shankar@intel.com>
Cc: "Tony Luck" <tony.luck@intel.com>
Cc: Vikas" <vikas.shivappa@intel.com>
Cc: Sai Praneeth" <sai.praneeth.prakhya@intel.com>
Cc: Reinette" <reinette.chatre@intel.com>
Link: https://lkml.kernel.org/r/1513810644-78015-7-git-send-email-fenghua.yu@intel.com
This commit is contained in:
Fenghua Yu 2017-12-20 14:57:24 -08:00 committed by Thomas Gleixner
parent 99adde9b37
commit 31516de306
2 changed files with 4 additions and 1 deletions
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3
Documentation/admin-guide/kernel-parameters.txt
View File

@ -3682,7 +3682,8 @@
rdt= [HW,X86,RDT] rdt= [HW,X86,RDT]
Turn on/off individual RDT features. List is: 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: E.g. to turn on cmt and turn off mba use:
rdt=cmt,!mba rdt=cmt,!mba

2
arch/x86/kernel/cpu/intel_rdt.c
View File

@ -691,6 +691,7 @@ enum {
RDT_FLAG_L3_CAT, RDT_FLAG_L3_CAT,
RDT_FLAG_L3_CDP, RDT_FLAG_L3_CDP,
RDT_FLAG_L2_CAT, RDT_FLAG_L2_CAT,
RDT_FLAG_L2_CDP,
RDT_FLAG_MBA, RDT_FLAG_MBA,
}; };
@ -713,6 +714,7 @@ static struct rdt_options rdt_options[] __initdata = {
RDT_OPT(RDT_FLAG_L3_CAT, "l3cat", X86_FEATURE_CAT_L3), 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_L3_CDP, "l3cdp", X86_FEATURE_CDP_L3),
RDT_OPT(RDT_FLAG_L2_CAT, "l2cat", X86_FEATURE_CAT_L2), 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), RDT_OPT(RDT_FLAG_MBA, "mba", X86_FEATURE_MBA),
}; };
#define NUM_RDT_OPTIONS ARRAY_SIZE(rdt_options) #define NUM_RDT_OPTIONS ARRAY_SIZE(rdt_options)