On 9/10/2024 05:19, Russell Haley wrote:
On 9/5/24 11:30 AM, Mario Limonciello wrote:
From: Mario Limonciello <mario.limonciello@xxxxxxx>
Explain that the sysfs file represents both preferred core being
enabled by the user and supported by the hardware.
Reviewed-by: Gautham R. Shenoy <gautham.shenoy@xxxxxxx>
Signed-off-by: Mario Limonciello <mario.limonciello@xxxxxxx>
---
v2->v3:
* Add tag
---
Documentation/admin-guide/pm/amd-pstate.rst | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/Documentation/admin-guide/pm/amd-pstate.rst b/Documentation/admin-guide/pm/amd-pstate.rst
index e13915c540648..d5c050ea390dc 100644
--- a/Documentation/admin-guide/pm/amd-pstate.rst
+++ b/Documentation/admin-guide/pm/amd-pstate.rst
@@ -263,6 +263,11 @@ lowest non-linear performance in `AMD CPPC Performance Capability
<perf_cap_>`_.)
This attribute is read-only.
+``amd_pstate_hw_prefcore``
+
+Whether the platform supports the preferred core feature and it has been
+enabled. This attribute is read-only.
+
``energy_performance_available_preferences``
A list of all the supported EPP preferences that could be used for
I notice I am confused. If the attribute is read only, how can it be
enabled by the user?
It is enabled by default. It can be disabled by the user via the kernel
command line:
amd_prefcore=disable
This is documented separately in kernel-parameters.txt.
