[Xen-devel] [PATCH] x86/mwait_idle: support Intel Atom Processor C2000 product family

["Jan Beulich" <JBeulich@xxxxxxxx>]

From: Len Brown <len.brown@xxxxxxxxx>

Support the "Intel(R) Atom(TM) Processor C2000 Product Family",
formerly code-named Avoton.  It is based on the next generation
Intel Atom processor architecture, formerly code-named Silvermont.

Signed-off-by: Len Brown <len.brown@xxxxxxxxx>
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

--- a/xen/arch/x86/cpu/mwait-idle.c
+++ b/xen/arch/x86/cpu/mwait-idle.c
@@ -1,7 +1,7 @@
 /*
  * mwait_idle.c - native hardware idle loop for modern processors
  *
- * Copyright (c) 2010, Intel Corporation.
+ * Copyright (c) 2013, Intel Corporation.
  * Len Brown <len.brown@xxxxxxxxx>
  *
  * This program is free software; you can redistribute it and/or modify it
@@ -301,6 +301,22 @@ static const struct cpuidle_state atom_c
        {}
 };
 
+static const struct cpuidle_state avn_cstates[] = {
+       {
+               .name = "C1-AVN",
+               .flags = MWAIT2flg(0x00),
+               .exit_latency = 2,
+               .target_residency = 2,
+       },
+       {
+               .name = "C6-AVN",
+               .flags = MWAIT2flg(0x51) | CPUIDLE_FLAG_TLB_FLUSHED,
+               .exit_latency = 15,
+               .target_residency = 45,
+       },
+       {}
+};
+
 static void mwait_idle(void)
 {
        unsigned int cpu = smp_processor_id();
@@ -436,6 +452,11 @@ static const struct idle_cpu idle_cpu_hs
        .disable_promotion_to_c1e = 1,
 };
 
+static const struct idle_cpu idle_cpu_avn = {
+       .state_table = avn_cstates,
+       .disable_promotion_to_c1e = 1,
+};
+
 #define ICPU(model, cpu) { 6, model, &idle_cpu_##cpu }
 
 static struct intel_idle_id {
@@ -459,6 +480,7 @@ static struct intel_idle_id {
        ICPU(0x3f, hsw),
        ICPU(0x45, hsw),
        ICPU(0x46, hsw),
+       ICPU(0x4d, avn),
        {}
 };

Attachment: x86-mwait-idle-AtomC2000.patch
Description: Text document

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