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Subject[PATCH 2/2] intel_idle: Support for Intel Xeon Phi Processor x200 Product Family
Date
From: Dasaratharaman Chandramouli <dasaratharaman.chandramouli@intel.com>

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>
---
drivers/idle/intel_idle.c | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)

diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c
index 146eed70b..ba947df 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);
--
2.7.1.339.g0233b80
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