cpufreq: intel_pstate: Add Skylake servers support

Currently intel_pstate can function only in HWP mode on Skylake servers.
When HWP feature is not enabled on the processor then acpi-cpufreq is
driver is used.

Based on the power and performance tests using intel_pstate scaling
algorithm the results are comparable. But intel_pstate brings in
additional features:
 - Display of turbo frequency range, which many users like to see
 - Place limits in the turbo frequency range when platform allows

Since these tests are done only using non PID algorithm introduced in
kernel version 4.14, this patch is not a backport candidate. So each user
has to carefully weigh the benefits before he backports.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index 3b6616b15c598fe2c9e0787ce00cf198038acadb..7edf7a0e5a96ac988b546476c06077e2aca483ae 100644 (file)
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -1620,6 +1620,7 @@ static const struct x86_cpu_id intel_pstate_cpu_ids[] = {
        ICPU(INTEL_FAM6_XEON_PHI_KNM,           knl_funcs),
        ICPU(INTEL_FAM6_ATOM_GOLDMONT,          core_funcs),
        ICPU(INTEL_FAM6_ATOM_GEMINI_LAKE,       core_funcs),
+       ICPU(INTEL_FAM6_SKYLAKE_X,              core_funcs),
        {}
 };
 MODULE_DEVICE_TABLE(x86cpu, intel_pstate_cpu_ids);