x86: use cpuid to check MWAIT support for C1

cpuid(0x05) provides extended information about MWAIT in EDX when bit
0 of ECX is set. Bit 4-7 of EDX determine whether MWAIT is supported
for C1. C1E enabled CPUs have these bits set to 0.

Based on an earlier patch from Andi Kleen.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 20 insertions, 8 deletions

diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index b3078f4ce25b..fe415ba606e0 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -122,19 +122,31 @@ static void poll_idle(void)
  *
  * idle=mwait overrides this decision and forces the usage of mwait.
  */
+
+#define MWAIT_INFO                      0x05
+#define MWAIT_ECX_EXTENDED_INFO         0x01
+#define MWAIT_EDX_C1                    0xf0
+
 static int __cpuinit mwait_usable(const struct cpuinfo_x86 *c)
 {
+        u32 eax, ebx, ecx, edx;
+
         if (force_mwait)
                 return 1;
 
-        if (c->x86_vendor == X86_VENDOR_AMD) {
-                switch(c->x86) {
-                case 0x10:
-                case 0x11:
-                        return 0;
-                }
-        }
-        return 1;
+        if (c->cpuid_level < MWAIT_INFO)
+                return 0;
+
+        cpuid(MWAIT_INFO, &eax, &ebx, &ecx, &edx);
+        /* Check, whether EDX has extended info about MWAIT */
+        if (!(ecx & MWAIT_ECX_EXTENDED_INFO))
+                return 1;
+
+        /*
+         * edx enumeratios MONITOR/MWAIT extensions. Check, whether
+         * C1  supports MWAIT
+         */
+        return (edx & MWAIT_EDX_C1);
 }
 
 void __cpuinit select_idle_routine(const struct cpuinfo_x86 *c)