diff options
| author | Tony Luck <tony.luck@intel.com> | 2025-12-17 09:21:11 -0800 |
|---|---|---|
| committer | Borislav Petkov (AMD) <bp@alien8.de> | 2026-01-09 23:38:32 +0100 |
| commit | 842e7f97d71a4116a650ec0045d6444b4377b512 (patch) | |
| tree | 7713700681f0c469e782e969910a63f2146f38c2 /Documentation/admin-guide | |
| parent | f4e0cd80d3e7c31327459008b01d63804838a89d (diff) | |
x86/resctrl: Add energy/perf choices to rdt boot option
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
Diffstat (limited to 'Documentation/admin-guide')
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index a8d0afde7f85..abd77f39c783 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -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): |