2024-05-27 16:44:01

by Tero Kristo

Subject: [PATCH 0/6] Intel Performance Limit Reasons support

Hello,

This series adds support for the Intel PLR (Performance Limit Reasons).
PLR provides status information for Intel HW performance events,
exported via debugfs within the existing TPMI hierarchy. The status bits
are sticky, and they can be cleared by writing "0" to the corresponding
debugfs files.

-Tero

2024-05-27 17:52:27

by Tero Kristo

Subject: [PATCH 6/6] doc: TPMI: Add entry for Performance Limit Reasons

Describe the new 'plr' (Performance Limit Reasons) directory contents under
the main TPMI debugfs folder.

Reviewed-by: Andy Shevchenko <[email protected]>
Reviewed-by: Ilpo Järvinen <[email protected]>
Signed-off-by: Tero Kristo <[email protected]>
---
Documentation/ABI/testing/debugfs-tpmi | 9 +++++++++
1 file changed, 9 insertions(+)

diff --git a/Documentation/ABI/testing/debugfs-tpmi b/Documentation/ABI/testing/debugfs-tpmi
index 597f0475fe6e..4daa9ecd7918 100644
--- a/Documentation/ABI/testing/debugfs-tpmi
+++ b/Documentation/ABI/testing/debugfs-tpmi
@@ -29,3 +29,12 @@ Example:
echo 0,0x20,0xff > mem_write
echo 1,64,64 > mem_write
Users: Debugging, any user space test suite
+
+What: /sys/kernel/debug/tpmi-<n>/plr/domain<n>/status
+Date: Aug 2024
+KernelVersion: 6.11
+Contact: Tero Kristo <[email protected]>
+Description:
+Shows the currently active Performance Limit Reasons for die level and the
+individual CPUs under the die. The contents of this file are sticky, and
+clearing all the statuses can be done by writing "0\n" to this file.
--
2.43.1