[PATCH v2 2/9] cpufreq: amd_pstate: add module parameter to load amd pstate EPP driver

From: Perry Yuan
Date: Sun Oct 09 2022 - 03:11:34 EST


The amd_pstate mode parameter will allow user to select which amd pstate
working mode as booting mode, amd_pstate instance or amd_pstate_epp instance.

1) amd_pstate instance is depending on the target operation mode.
2) amd_pstate_epp instance is depending on the set_policy operation mode.It
is also called active mode that AMD SMU has EPP algorithm to control the
CPU runtime frequency according to the EPP set value and workload.

Signed-off-by: Perry Yuan <Perry.Yuan@xxxxxxx>
---
drivers/cpufreq/amd-pstate.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
index f52b8f2fe529..14a275c22aff 100644
--- a/drivers/cpufreq/amd-pstate.c
+++ b/drivers/cpufreq/amd-pstate.c
@@ -63,6 +63,10 @@ module_param(shared_mem, bool, 0444);
MODULE_PARM_DESC(shared_mem,
"enable amd-pstate on processors with shared memory solution (false = disabled (default), true = enabled)");

+static bool epp_enabled = false;
+module_param(epp_enabled, bool, 0444);
+MODULE_PARM_DESC(epp_enabled, "Enable energy performance preference (EPP) control");
+
static struct cpufreq_driver amd_pstate_driver;

/**
--
2.34.1