[Xen-devel] [PATCH 2/3] mwait-idle: add support for AMD processors

["Woods, Brian" <Brian.Woods@xxxxxxx>]

Newer AMD processors (F17h) have mwait support.  Add some checks to make
sure vendor specific code is run correctly and some infrastructure to
facilitate adding AMD processors.

Signed-off-by: Brian Woods <brian.woods@xxxxxxx>
---
 xen/arch/x86/cpu/mwait-idle.c | 25 +++++++++++++++++++++++--
 1 file changed, 23 insertions(+), 2 deletions(-)

diff --git a/xen/arch/x86/cpu/mwait-idle.c b/xen/arch/x86/cpu/mwait-idle.c
index a063e39d60..1036c8b101 100644
--- a/xen/arch/x86/cpu/mwait-idle.c
+++ b/xen/arch/x86/cpu/mwait-idle.c
@@ -979,6 +979,13 @@ static const struct x86_cpu_id intel_idle_ids[] 
__initconstrel = {
        {}
 };
 
+#define ACPU(family, model, cpu) \
+       { X86_VENDOR_AMD, family, model, X86_FEATURE_ALWAYS, &idle_cpu_##cpu}
+
+static const struct x86_cpu_id amd_idle_ids[] __initconstrel = {
+       {}
+};
+
 /*
  * ivt_idle_state_table_update(void)
  *
@@ -1115,6 +1122,9 @@ static void __init sklh_idle_state_table_update(void)
  */
 static void __init mwait_idle_state_table_update(void)
 {
+       if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD)
+               return;
+
        switch (boot_cpu_data.x86_model) {
        case 0x3e: /* IVT */
                ivt_idle_state_table_update();
@@ -1126,13 +1136,24 @@ static void __init mwait_idle_state_table_update(void)
        case 0x5e: /* SKL-H */
                sklh_idle_state_table_update();
                break;
-       }
+       }
 }
 
 static int __init mwait_idle_probe(void)
 {
        unsigned int eax, ebx, ecx;
-       const struct x86_cpu_id *id = x86_match_cpu(intel_idle_ids);
+       const struct x86_cpu_id *id;
+
+       switch (boot_cpu_data.x86_vendor) {
+       case X86_VENDOR_INTEL:
+               id = x86_match_cpu(intel_idle_ids);
+               break;
+       case X86_VENDOR_AMD:
+               id = x86_match_cpu(amd_idle_ids);
+               break;
+       default:
+               id = NULL;
+       }
 
        if (!id) {
                pr_debug(PREFIX "does not run on family %d model %d\n",
-- 
2.11.0


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