[Xen-devel] [PATCH] mwait-idle: support for Intel Xeon Phi Processor x200 Product Family

["Jan Beulich" <JBeulich@xxxxxxxx>]

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@xxxxxxxxx>
[micah.barany@xxxxxxxxx: adjusted values of residency and latency]
Signed-off-by: Micah Barany <micah.barany@xxxxxxxxx>
[Linux commit: 281baf7a702693deaa45c98ef0c5161006b48257]
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

--- a/xen/arch/x86/cpu/mwait-idle.c
+++ b/xen/arch/x86/cpu/mwait-idle.c
@@ -574,6 +574,22 @@ static const struct cpuidle_state avn_cs
        {}
 };
 
+static const struct cpuidle_state knl_cstates[] = {
+       {
+               .name = "C1-KNL",
+               .flags = MWAIT2flg(0x00),
+               .exit_latency = 1,
+               .target_residency = 2,
+       },
+       {
+               .name = "C6-KNL",
+               .flags = MWAIT2flg(0x10) | CPUIDLE_FLAG_TLB_FLUSHED,
+               .exit_latency = 120,
+               .target_residency = 500,
+       },
+       {}
+};
+
 static void mwait_idle(void)
 {
        unsigned int cpu = smp_processor_id();
@@ -748,6 +764,10 @@ static const struct idle_cpu idle_cpu_av
        .disable_promotion_to_c1e = 1,
 };
 
+static const struct idle_cpu idle_cpu_knl = {
+       .state_table = knl_cstates,
+};
+
 #define ICPU(model, cpu) \
     { X86_VENDOR_INTEL, 6, model, X86_FEATURE_MONITOR, \
         &idle_cpu_##cpu}
@@ -780,6 +800,7 @@ static const struct x86_cpu_id intel_idl
        ICPU(0x56, bdw),
        ICPU(0x4e, skl),
        ICPU(0x5e, skl),
+       ICPU(0x57, knl),
        {}
 };

Attachment: x86-mwait-idle-Xeon-Phi-x200.patch
Description: Text document

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