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 <andriy.shevchenko@linux.intel.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Tero Kristo <tero.kristo@linux.intel.com>
Link: https://lore.kernel.org/r/20240527133400.483634-7-tero.kristo@linux.intel.com
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

diff --git a/Documentation/ABI/testing/debugfs-tpmi b/Documentation/ABI/testing/debugfs-tpmi
index 597f0475fe6ebef6ac48b3b5da1c7ae925a61f50..c493a1403d2f301d4dfdeb48dbf43550a717eca8 100644 (file)
--- 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 <tero.kristo@linux.intel.com>
+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.