intel_idle: Support for Intel Xeon Phi Processor x200 Product Family

Enables "Intel(R) Xeon Phi(TM) Processor x200 Product Family" support,
formerly code-named KNL. It is based on modified Intel Atom Silvermont
microarchitecture.

Signed-off-by: Dasaratharaman Chandramouli <dasaratharaman.chandramouli@intel.com>
[micah.barany@intel.com: adjusted values of residency and latency]
Signed-off-by: Micah Barany <micah.barany@intel.com>
[hubert.chrzaniuk@intel.com: removed deprecated CPUIDLE_FLAG_TIME_VALID flag]
Signed-off-by: Hubert Chrzaniuk <hubert.chrzaniuk@intel.com>
Signed-off-by: Pawel Karczewski <pawel.karczewski@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 25 insertions, 0 deletions

diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c
index 146eed70bdf4..ba947df5a8c7 100644
--- a/drivers/idle/intel_idle.c
+++ b/drivers/idle/intel_idle.c
@@ -716,6 +716,26 @@ static struct cpuidle_state avn_cstates[] = {
         {
                 .enter = NULL }
 };
+static struct cpuidle_state knl_cstates[] = {
+        {
+                .name = "C1-KNL",
+                .desc = "MWAIT 0x00",
+                .flags = MWAIT2flg(0x00),
+                .exit_latency = 1,
+                .target_residency = 2,
+                .enter = &intel_idle,
+                .enter_freeze = intel_idle_freeze },
+        {
+                .name = "C6-KNL",
+                .desc = "MWAIT 0x10",
+                .flags = MWAIT2flg(0x10) | CPUIDLE_FLAG_TLB_FLUSHED,
+                .exit_latency = 120,
+                .target_residency = 500,
+                .enter = &intel_idle,
+                .enter_freeze = intel_idle_freeze },
+        {
+                .enter = NULL }
+};
 
 /**
  * intel_idle
@@ -890,6 +910,10 @@ static const struct idle_cpu idle_cpu_avn = {
         .disable_promotion_to_c1e = true,
 };
 
+static const struct idle_cpu idle_cpu_knl = {
+        .state_table = knl_cstates,
+};
+
 #define ICPU(model, cpu) \
         { X86_VENDOR_INTEL, 6, model, X86_FEATURE_MWAIT, (unsigned long)&cpu }
 
@@ -921,6 +945,7 @@ static const struct x86_cpu_id intel_idle_ids[] __initconst = {
         ICPU(0x56, idle_cpu_bdw),
         ICPU(0x4e, idle_cpu_skl),
         ICPU(0x5e, idle_cpu_skl),
+        ICPU(0x57, idle_cpu_knl),
         {}
 };
 MODULE_DEVICE_TABLE(x86cpu, intel_idle_ids);