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x86/resctrl: Add energy/perf choices to rdt boot option

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Legacy resctrl features are enumerated by X86_FEATURE_* flags. These may be
overridden by quirks to disable features in the case of errata.  Users can use
kernel command line options to either disable a feature, or to force enable
a feature that was disabled by a quirk.

A different approach is needed for hardware features that do not have an
X86_FEATURE_* flag.

Update parsing of the "rdt=" boot parameter to call the telemetry driver
directly to handle new "perf" and "energy" options that controls activation of
telemetry monitoring of the named type. By itself a "perf" or "energy" option
controls the forced enabling or disabling (with ! prefix) of all event groups
of the named type. A ":guid" suffix allows for fine grained control per event
group.

  [ bp: s/intel_aet_option/intel_handle_aet_option/g ]

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Link: https://lore.kernel.org/20251217172121.12030-1-tony.luck@intel.com
This commit is contained in:
Tony Luck
2025-12-17 09:21:11 -08:00
committed by Borislav Petkov (AMD)
parent f4e0cd80d3
commit 842e7f97d7
4 changed files with 48 additions and 1 deletions
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7
Documentation/admin-guide/kernel-parameters.txt
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@@ -6325,9 +6325,14 @@ Kernel parameters
rdt= [HW,X86,RDT]
Turn on/off individual RDT features. List is:
cmt, mbmtotal, mbmlocal, l3cat, l3cdp, l2cat, l2cdp,
mba, smba, bmec, abmc, sdciae.
mba, smba, bmec, abmc, sdciae, energy[:guid],
perf[:guid].
E.g. to turn on cmt and turn off mba use:
rdt=cmt,!mba
To turn off all energy telemetry monitoring and ensure that
perf telemetry monitoring associated with guid 0x12345
is enabled use:
rdt=!energy,perf:0x12345
reboot= [KNL]
Format (x86 or x86_64):