amd-pstate: Switch to amd-pstate by default on some Server platforms

Currently the default cpufreq driver for all the AMD EPYC servers is
acpi-cpufreq. Going forward, switch to amd-pstate as the default
driver on the AMD EPYC server platforms with CPU family 0x1A or
higher. The default mode will be active mode.

Testing shows that amd-pstate with active mode and performance
governor provides comparable or better performance per-watt against
acpi-cpufreq + performance governor.

Likewise, amd-pstate with active mode and powersave governor with the
energy_performance_preference=power (EPP=255) provides comparable or
better performance per-watt against acpi-cpufreq + schedutil governor
for a wide range of workloads.

Users can still revert to using acpi-cpufreq driver on these platforms
with the "amd_pstate=disable" kernel commandline parameter.

Signed-off-by: Swapnil Sapkal <swapnil.sapkal@amd.com>
Signed-off-by: Gautham R. Shenoy <gautham.shenoy@amd.com>
Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
Link: https://lore.kernel.org/r/20241021101836.9047-3-gautham.shenoy@amd.com
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>

diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
index 23349f50c83ebddc8683826ef2e73a55c9ab9bf2..3c14962adeb22773e4ceb90ace0ab66ce22b4e81 100644 (file)
--- a/drivers/cpufreq/amd-pstate.c
+++ b/drivers/cpufreq/amd-pstate.c
@@ -1832,10 +1832,10 @@ static int __init amd_pstate_init(void)
        if (cppc_state == AMD_PSTATE_UNDEFINED) {
                /* Disable on the following configs by default:
                 * 1. Undefined platforms
-                * 2. Server platforms
+                * 2. Server platforms with CPUs older than Family 0x1A.
                 */
                if (amd_pstate_acpi_pm_profile_undefined() ||
-                   amd_pstate_acpi_pm_profile_server()) {
+                   (amd_pstate_acpi_pm_profile_server() && boot_cpu_data.x86 < 0x1A)) {
                        pr_info("driver load is disabled, boot with specific mode to enable this\n");
                        return -ENODEV;
                }