Wei, Gang
2009-Feb-26 13:03 UTC
[Xen-devel] [PATCH 3/4] ACPI: Backport to support ACPI throttling s/w coordination
ACPI: Backport to support ACPI throttling s/w coordination
commit 3abbd337c60591305cbfeb984ff2922c175be37f
Author: Zhao Yakui <yakui.zhao@intel.com>
Date: Mon Jan 28 13:53:21 2008 +0800
ACPI: Set _PSD ACPI_PDC_SMP_T_SWCOORD
The ACPI_PDC_SMP_T_SWCOORD bit is set by and OS that is capable of
native ACPI throttling software coordination for mutli-processors
using the _TSD information.
Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
Signed-off-by: Wei Gang <gang.wei@intel.com>
diff -r 4d75cddbbe14 arch/i386/kernel/acpi/processor.c
--- a/arch/i386/kernel/acpi/processor.c Tue Feb 24 19:54:08 2009 +0800
+++ b/arch/i386/kernel/acpi/processor.c Tue Feb 24 20:06:20 2009 +0800
@@ -46,6 +46,12 @@ static void init_intel_pdc(struct acpi_p
buf[1] = 1;
buf[2] = ACPI_PDC_C_CAPABILITY_SMP;
+ /*
+ * The default of PDC_SMP_T_SWCOORD bit is set for intel x86 cpu so
+ * that OSPM is capable of native ACPI throttling software
+ * coordination using BIOS supplied _TSD info.
+ */
+ buf[2] |= ACPI_PDC_SMP_T_SWCOORD;
if (cpu_has(c, X86_FEATURE_EST))
buf[2] |= ACPI_PDC_EST_CAPABILITY_SWSMP;
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xensource.com
http://lists.xensource.com/xen-devel