@@ -63,6 +63,11 @@ 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 replace = false;
+module_param(replace, bool, 0444);
+MODULE_PARM_DESC(replace,
+ "replace other cpufreq drivers upon init if necessary");
+
static struct cpufreq_driver amd_pstate_driver;
/**
@@ -598,9 +603,11 @@ static int __init amd_pstate_init(void)
return -ENODEV;
}
- /* don't keep reloading if cpufreq_driver exists */
- if (cpufreq_get_current_driver())
- return -EEXIST;
+ if (cpufreq_get_current_driver()) {
+ ret = replace ? cpufreq_unregister_driver(NULL) : -EEXIST;
+ if (ret)
+ return ret;
+ }
/* capability check */
if (boot_cpu_has(X86_FEATURE_CPPC)) {
`amd-pstate` can be compiled as a module. This however can be a deficiency because `acpi-cpufreq` will be loaded earlier when compiled into the kernel meaning `amd-pstate` doesn't get a chance. `acpi-cpufreq` is also unable to be unloaded in this circumstance. To better improve the usability of `amd-pstate` when compiled as a module, add an optional module parameter that will force it to replace other cpufreq drivers at startup. Signed-off-by: Mario Limonciello <mario.limonciello@amd.com> --- drivers/cpufreq/amd-pstate.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-)