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Jan Beulich

2011-Aug-22 06:39 UTC

[Xen-devel] [PATCH] ACPI: add _PDC input override mechanism

In order to have Dom0 call _PDC with input fully representing Xen''s
capabilities, and in order to avoid building knowledge of Xen
implementation details into Dom0, this provides a mechanism by which
the Dom0 kernel can, once it filled the _PDC input buffer according to
its own knowledge, present the buffer to Xen to apply overrides for
the parts of the C-, P-, and T-state management that it controls. This
is particularly to address the dependency of Xen using MWAIT to enter
certain C-states on the availability of the break-on-interrupt
extension (which the Dom0 kernel should have no need to know about).

The patch, in order to apply correctly, depends on the one titled "pm:
don''t truncate processors'' ACPI IDs to 8 bits" sent at
the end of last
week.

Signed-off-by: Jan Beulich <jbeulich@novell.com>

--- a/xen/arch/ia64/linux-xen/acpi.c
+++ b/xen/arch/ia64/linux-xen/acpi.c
@@ -241,6 +241,13 @@ int get_cpu_id(u32 acpi_id)
 
 	return -1;
 }
+
+int arch_acpi_set_pdc_bits(u32 acpi_id, u32 *pdc, u32 mask)
+{
+	pdc[2] |= ACPI_PDC_EST_CAPABILITY_SMP & mask;
+	return 0;
+}
+
 #endif
 
 static int __init
--- a/xen/arch/x86/acpi/cpu_idle.c
+++ b/xen/arch/x86/acpi/cpu_idle.c
@@ -643,12 +643,6 @@ static int cpuidle_init_cpu(int cpu)
     return 0;
 }
 
-#define CPUID_MWAIT_LEAF (5)
-#define CPUID5_ECX_EXTENSIONS_SUPPORTED (0x1)
-#define CPUID5_ECX_INTERRUPT_BREAK      (0x2)
-
-#define MWAIT_ECX_INTERRUPT_BREAK       (0x1)
-
 #define MWAIT_SUBSTATE_MASK (0xf)
 #define MWAIT_SUBSTATE_SIZE (4)
 
--- a/xen/arch/x86/acpi/lib.c
+++ b/xen/arch/x86/acpi/lib.c
@@ -81,3 +81,47 @@ unsigned int acpi_get_processor_id(unsig
 
 	return INVALID_ACPIID;
 }
+
+static void get_mwait_ecx(void *info)
+{
+	*(u32 *)info = cpuid_ecx(CPUID_MWAIT_LEAF);
+}
+
+int arch_acpi_set_pdc_bits(u32 acpi_id, u32 *pdc, u32 mask)
+{
+	unsigned int cpu = get_cpu_id(acpi_id);
+	struct cpuinfo_x86 *c;
+	u32 ecx;
+
+	if (!(acpi_id + 1))
+		c = &boot_cpu_data;
+	else if (cpu >= NR_CPUS || !cpu_online(cpu))
+		return -EINVAL;
+	else
+		c = cpu_data + cpu;
+
+	pdc[2] |= ACPI_PDC_C_CAPABILITY_SMP & mask;
+
+	if (cpu_has(c, X86_FEATURE_EST))
+		pdc[2] |= ACPI_PDC_EST_CAPABILITY_SWSMP & mask;
+
+	if (cpu_has(c, X86_FEATURE_ACPI))
+		pdc[2] |= ACPI_PDC_T_FFH & mask;
+
+	/*
+	 * If mwait/monitor or its break-on-interrupt extension are
+	 * unsupported, Cx_FFH will be disabled.
+	 */
+	if (!cpu_has(c, X86_FEATURE_MWAIT) ||
+	    c->cpuid_level < CPUID_MWAIT_LEAF)
+		ecx = 0;
+	else if (c == &boot_cpu_data || cpu == smp_processor_id())
+		ecx = cpuid_ecx(CPUID_MWAIT_LEAF);
+	else
+		on_selected_cpus(cpumask_of(cpu), get_mwait_ecx, &ecx, 1);
+	if (!(ecx & CPUID5_ECX_EXTENSIONS_SUPPORTED) ||
+	    !(ecx & CPUID5_ECX_INTERRUPT_BREAK))
+		pdc[2] &= ~(ACPI_PDC_C_C1_FFH | ACPI_PDC_C_C2C3_FFH);
+
+	return 0;
+}
--- a/xen/arch/x86/platform_hypercall.c
+++ b/xen/arch/x86/platform_hypercall.c
@@ -416,6 +416,15 @@ ret_t do_platform_op(XEN_GUEST_HANDLE(xe
             ret = -EINVAL;
             break;
 
+        case XEN_PM_PDC:
+        {
+            XEN_GUEST_HANDLE(uint32) pdc;
+
+            guest_from_compat_handle(pdc, op->u.set_pminfo.u.pdc);
+            ret = acpi_set_pdc_bits(op->u.set_pminfo.id, pdc);
+        }
+        break;
+
         default:
             ret = -EINVAL;
             break;
--- a/xen/drivers/acpi/pmstat.c
+++ b/xen/drivers/acpi/pmstat.c
@@ -517,3 +517,34 @@ int do_pm_op(struct xen_sysctl_pm_op *op
 
     return ret;
 }
+
+int acpi_set_pdc_bits(u32 acpi_id, XEN_GUEST_HANDLE(uint32) pdc)
+{
+    u32 bits[3];
+    int ret;
+
+    if ( copy_from_guest(bits, pdc, 2) )
+        ret = -EFAULT;
+    else if ( bits[0] != ACPI_PDC_REVISION_ID || !bits[1] )
+        ret = -EINVAL;
+    else if ( copy_from_guest_offset(bits + 2, pdc, 2, 1) )
+        ret = -EFAULT;
+    else
+    {
+        u32 mask = 0;
+
+        if ( xen_processor_pmbits & XEN_PROCESSOR_PM_CX )
+            mask |= ACPI_PDC_C_MASK | ACPI_PDC_SMP_C1PT;
+        if ( xen_processor_pmbits & XEN_PROCESSOR_PM_PX )
+            mask |= ACPI_PDC_P_MASK | ACPI_PDC_SMP_C1PT;
+        if ( xen_processor_pmbits & XEN_PROCESSOR_PM_TX )
+            mask |= ACPI_PDC_T_MASK | ACPI_PDC_SMP_C1PT;
+        bits[2] &= (ACPI_PDC_C_MASK | ACPI_PDC_P_MASK | ACPI_PDC_T_MASK |
+                    ACPI_PDC_SMP_C1PT) & ~mask;
+        ret = arch_acpi_set_pdc_bits(acpi_id, bits, mask);
+    }
+    if ( !ret )
+        ret = copy_to_guest_offset(pdc, 2, bits + 2, 1);
+
+    return ret;
+}
--- a/xen/include/acpi/cpufreq/processor_perf.h
+++ b/xen/include/acpi/cpufreq/processor_perf.h
@@ -3,10 +3,10 @@
 
 #include <public/platform.h>
 #include <public/sysctl.h>
+#include <xen/acpi.h>
 
 #define XEN_PX_INIT 0x80000000
 
-int get_cpu_id(u32);
 int powernow_cpufreq_init(void);
 unsigned int powernow_register_driver(void);
 unsigned int get_measured_perf(unsigned int cpu, unsigned int flag);
--- a/xen/include/acpi/pdc_intel.h
+++ b/xen/include/acpi/pdc_intel.h
@@ -4,6 +4,8 @@
 #ifndef __PDC_INTEL_H__
 #define __PDC_INTEL_H__
 
+#define ACPI_PDC_REVISION_ID		1
+
 #define ACPI_PDC_P_FFH			(0x0001)
 #define ACPI_PDC_C_C1_HALT		(0x0002)
 #define ACPI_PDC_T_FFH			(0x0004)
@@ -14,6 +16,7 @@
 #define ACPI_PDC_SMP_T_SWCOORD		(0x0080)
 #define ACPI_PDC_C_C1_FFH		(0x0100)
 #define ACPI_PDC_C_C2C3_FFH		(0x0200)
+#define ACPI_PDC_SMP_P_HWCOORD		(0x0800)
 
 #define ACPI_PDC_EST_CAPABILITY_SMP	(ACPI_PDC_SMP_C1PT | \
 					 ACPI_PDC_C_C1_HALT | \
@@ -22,6 +25,7 @@
 #define ACPI_PDC_EST_CAPABILITY_SWSMP	(ACPI_PDC_SMP_C1PT | \
 					 ACPI_PDC_C_C1_HALT | \
 					 ACPI_PDC_SMP_P_SWCOORD | \
+					 ACPI_PDC_SMP_P_HWCOORD | \
 					 ACPI_PDC_P_FFH)
 
 #define ACPI_PDC_C_CAPABILITY_SMP	(ACPI_PDC_SMP_C2C3  | \
@@ -30,4 +34,17 @@
 					 ACPI_PDC_C_C1_FFH  | \
 					 ACPI_PDC_C_C2C3_FFH)
 
+#define ACPI_PDC_C_MASK			(ACPI_PDC_C_C1_HALT | \
+					 ACPI_PDC_C_C1_FFH | \
+					 ACPI_PDC_SMP_C2C3 | \
+					 ACPI_PDC_SMP_C_SWCOORD | \
+					 ACPI_PDC_C_C2C3_FFH)
+
+#define ACPI_PDC_P_MASK			(ACPI_PDC_P_FFH | \
+					 ACPI_PDC_SMP_P_SWCOORD | \
+					 ACPI_PDC_SMP_P_HWCOORD)
+
+#define ACPI_PDC_T_MASK			(ACPI_PDC_T_FFH | \
+					 ACPI_PDC_SMP_T_SWCOORD)
+
 #endif				/* __PDC_INTEL_H__ */
--- a/xen/include/asm-x86/cpufeature.h
+++ b/xen/include/asm-x86/cpufeature.h
@@ -152,6 +152,10 @@
 #define boot_cpu_has(bit)	test_bit(bit, boot_cpu_data.x86_capability)
 #define cpufeat_mask(idx)       (1u << ((idx) & 31))
 
+#define CPUID_MWAIT_LEAF                5
+#define CPUID5_ECX_EXTENSIONS_SUPPORTED 0x1
+#define CPUID5_ECX_INTERRUPT_BREAK      0x2
+
 #ifdef __i386__
 #define cpu_has_vme		boot_cpu_has(X86_FEATURE_VME)
 #define cpu_has_de		boot_cpu_has(X86_FEATURE_DE)
--- a/xen/include/public/platform.h
+++ b/xen/include/public/platform.h
@@ -304,6 +304,7 @@ DEFINE_XEN_GUEST_HANDLE(xenpf_getidletim
 #define XEN_PM_CX   0
 #define XEN_PM_PX   1
 #define XEN_PM_TX   2
+#define XEN_PM_PDC  3
 
 /* Px sub info type */
 #define XEN_PX_PCT   1
@@ -401,6 +402,7 @@ struct xenpf_set_processor_pminfo {
     union {
         struct xen_processor_power          power;/* Cx: _CST/_CSD */
         struct xen_processor_performance    perf; /* Px: _PPC/_PCT/_PSS/_PSD */
+        XEN_GUEST_HANDLE(uint32)            pdc;  /* _PDC */
     } u;
 };
 typedef struct xenpf_set_processor_pminfo xenpf_set_processor_pminfo_t;
--- a/xen/include/xen/acpi.h
+++ b/xen/include/xen/acpi.h
@@ -322,6 +322,8 @@ static inline int acpi_boot_table_init(v
 
 #endif 	/*!CONFIG_ACPI_BOOT*/
 
+int get_cpu_id(u32 acpi_id);
+
 unsigned int acpi_register_gsi (u32 gsi, int edge_level, int active_high_low);
 int acpi_gsi_to_irq (u32 gsi, unsigned int *irq);
 
@@ -358,6 +360,9 @@ static inline unsigned int acpi_get_csta
 static inline void acpi_set_cstate_limit(unsigned int new_limit) { return; }
 #endif
 
+int acpi_set_pdc_bits(u32 acpi_id, XEN_GUEST_HANDLE(uint32));
+int arch_acpi_set_pdc_bits(u32 acpi_id, u32 *, u32 mask);
+
 #ifdef CONFIG_ACPI_NUMA
 int acpi_get_pxm(acpi_handle handle);
 #else




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Tian, Kevin

2011-Aug-23 04:36 UTC

head link

[Xen-devel] RE: [PATCH] ACPI: add _PDC input override mechanism

> From: Jan Beulich [mailto:JBeulich@novell.com]
> Sent: Monday, August 22, 2011 2:40 PM
> 
> In order to have Dom0 call _PDC with input fully representing
Xen''s
> capabilities, and in order to avoid building knowledge of Xen
> implementation details into Dom0, this provides a mechanism by which
> the Dom0 kernel can, once it filled the _PDC input buffer according to
> its own knowledge, present the buffer to Xen to apply overrides for
> the parts of the C-, P-, and T-state management that it controls. This
> is particularly to address the dependency of Xen using MWAIT to enter
> certain C-states on the availability of the break-on-interrupt
> extension (which the Dom0 kernel should have no need to know about).
> 
> The patch, in order to apply correctly, depends on the one titled "pm:
> don''t truncate processors'' ACPI IDs to 8 bits" sent
at the end of last
> week.
> 
> Signed-off-by: Jan Beulich <jbeulich@novell.com>
looks good to me.

Thanks
Kevin
> 
> --- a/xen/arch/ia64/linux-xen/acpi.c
> +++ b/xen/arch/ia64/linux-xen/acpi.c
> @@ -241,6 +241,13 @@ int get_cpu_id(u32 acpi_id)
> 
>  	return -1;
>  }
> +
> +int arch_acpi_set_pdc_bits(u32 acpi_id, u32 *pdc, u32 mask)
> +{
> +	pdc[2] |= ACPI_PDC_EST_CAPABILITY_SMP & mask;
> +	return 0;
> +}
> +
>  #endif
> 
>  static int __init
> --- a/xen/arch/x86/acpi/cpu_idle.c
> +++ b/xen/arch/x86/acpi/cpu_idle.c
> @@ -643,12 +643,6 @@ static int cpuidle_init_cpu(int cpu)
>      return 0;
>  }
> 
> -#define CPUID_MWAIT_LEAF (5)
> -#define CPUID5_ECX_EXTENSIONS_SUPPORTED (0x1)
> -#define CPUID5_ECX_INTERRUPT_BREAK      (0x2)
> -
> -#define MWAIT_ECX_INTERRUPT_BREAK       (0x1)
> -
>  #define MWAIT_SUBSTATE_MASK (0xf)
>  #define MWAIT_SUBSTATE_SIZE (4)
> 
> --- a/xen/arch/x86/acpi/lib.c
> +++ b/xen/arch/x86/acpi/lib.c
> @@ -81,3 +81,47 @@ unsigned int acpi_get_processor_id(unsig
> 
>  	return INVALID_ACPIID;
>  }
> +
> +static void get_mwait_ecx(void *info)
> +{
> +	*(u32 *)info = cpuid_ecx(CPUID_MWAIT_LEAF);
> +}
> +
> +int arch_acpi_set_pdc_bits(u32 acpi_id, u32 *pdc, u32 mask)
> +{
> +	unsigned int cpu = get_cpu_id(acpi_id);
> +	struct cpuinfo_x86 *c;
> +	u32 ecx;
> +
> +	if (!(acpi_id + 1))
> +		c = &boot_cpu_data;
> +	else if (cpu >= NR_CPUS || !cpu_online(cpu))
> +		return -EINVAL;
> +	else
> +		c = cpu_data + cpu;
> +
> +	pdc[2] |= ACPI_PDC_C_CAPABILITY_SMP & mask;
> +
> +	if (cpu_has(c, X86_FEATURE_EST))
> +		pdc[2] |= ACPI_PDC_EST_CAPABILITY_SWSMP & mask;
> +
> +	if (cpu_has(c, X86_FEATURE_ACPI))
> +		pdc[2] |= ACPI_PDC_T_FFH & mask;
> +
> +	/*
> +	 * If mwait/monitor or its break-on-interrupt extension are
> +	 * unsupported, Cx_FFH will be disabled.
> +	 */
> +	if (!cpu_has(c, X86_FEATURE_MWAIT) ||
> +	    c->cpuid_level < CPUID_MWAIT_LEAF)
> +		ecx = 0;
> +	else if (c == &boot_cpu_data || cpu == smp_processor_id())
> +		ecx = cpuid_ecx(CPUID_MWAIT_LEAF);
> +	else
> +		on_selected_cpus(cpumask_of(cpu), get_mwait_ecx, &ecx, 1);
> +	if (!(ecx & CPUID5_ECX_EXTENSIONS_SUPPORTED) ||
> +	    !(ecx & CPUID5_ECX_INTERRUPT_BREAK))
> +		pdc[2] &= ~(ACPI_PDC_C_C1_FFH | ACPI_PDC_C_C2C3_FFH);
> +
> +	return 0;
> +}
> --- a/xen/arch/x86/platform_hypercall.c
> +++ b/xen/arch/x86/platform_hypercall.c
> @@ -416,6 +416,15 @@ ret_t do_platform_op(XEN_GUEST_HANDLE(xe
>              ret = -EINVAL;
>              break;
> 
> +        case XEN_PM_PDC:
> +        {
> +            XEN_GUEST_HANDLE(uint32) pdc;
> +
> +            guest_from_compat_handle(pdc, op->u.set_pminfo.u.pdc);
> +            ret = acpi_set_pdc_bits(op->u.set_pminfo.id, pdc);
> +        }
> +        break;
> +
>          default:
>              ret = -EINVAL;
>              break;
> --- a/xen/drivers/acpi/pmstat.c
> +++ b/xen/drivers/acpi/pmstat.c
> @@ -517,3 +517,34 @@ int do_pm_op(struct xen_sysctl_pm_op *op
> 
>      return ret;
>  }
> +
> +int acpi_set_pdc_bits(u32 acpi_id, XEN_GUEST_HANDLE(uint32) pdc)
> +{
> +    u32 bits[3];
> +    int ret;
> +
> +    if ( copy_from_guest(bits, pdc, 2) )
> +        ret = -EFAULT;
> +    else if ( bits[0] != ACPI_PDC_REVISION_ID || !bits[1] )
> +        ret = -EINVAL;
> +    else if ( copy_from_guest_offset(bits + 2, pdc, 2, 1) )
> +        ret = -EFAULT;
> +    else
> +    {
> +        u32 mask = 0;
> +
> +        if ( xen_processor_pmbits & XEN_PROCESSOR_PM_CX )
> +            mask |= ACPI_PDC_C_MASK | ACPI_PDC_SMP_C1PT;
> +        if ( xen_processor_pmbits & XEN_PROCESSOR_PM_PX )
> +            mask |= ACPI_PDC_P_MASK | ACPI_PDC_SMP_C1PT;
> +        if ( xen_processor_pmbits & XEN_PROCESSOR_PM_TX )
> +            mask |= ACPI_PDC_T_MASK | ACPI_PDC_SMP_C1PT;
> +        bits[2] &= (ACPI_PDC_C_MASK | ACPI_PDC_P_MASK |
> ACPI_PDC_T_MASK |
> +                    ACPI_PDC_SMP_C1PT) & ~mask;
> +        ret = arch_acpi_set_pdc_bits(acpi_id, bits, mask);
> +    }
> +    if ( !ret )
> +        ret = copy_to_guest_offset(pdc, 2, bits + 2, 1);
> +
> +    return ret;
> +}
> --- a/xen/include/acpi/cpufreq/processor_perf.h
> +++ b/xen/include/acpi/cpufreq/processor_perf.h
> @@ -3,10 +3,10 @@
> 
>  #include <public/platform.h>
>  #include <public/sysctl.h>
> +#include <xen/acpi.h>
> 
>  #define XEN_PX_INIT 0x80000000
> 
> -int get_cpu_id(u32);
>  int powernow_cpufreq_init(void);
>  unsigned int powernow_register_driver(void);
>  unsigned int get_measured_perf(unsigned int cpu, unsigned int flag);
> --- a/xen/include/acpi/pdc_intel.h
> +++ b/xen/include/acpi/pdc_intel.h
> @@ -4,6 +4,8 @@
>  #ifndef __PDC_INTEL_H__
>  #define __PDC_INTEL_H__
> 
> +#define ACPI_PDC_REVISION_ID		1
> +
>  #define ACPI_PDC_P_FFH			(0x0001)
>  #define ACPI_PDC_C_C1_HALT		(0x0002)
>  #define ACPI_PDC_T_FFH			(0x0004)
> @@ -14,6 +16,7 @@
>  #define ACPI_PDC_SMP_T_SWCOORD		(0x0080)
>  #define ACPI_PDC_C_C1_FFH		(0x0100)
>  #define ACPI_PDC_C_C2C3_FFH		(0x0200)
> +#define ACPI_PDC_SMP_P_HWCOORD		(0x0800)
> 
>  #define ACPI_PDC_EST_CAPABILITY_SMP	(ACPI_PDC_SMP_C1PT | \
>  					 ACPI_PDC_C_C1_HALT | \
> @@ -22,6 +25,7 @@
>  #define ACPI_PDC_EST_CAPABILITY_SWSMP	(ACPI_PDC_SMP_C1PT | \
>  					 ACPI_PDC_C_C1_HALT | \
>  					 ACPI_PDC_SMP_P_SWCOORD | \
> +					 ACPI_PDC_SMP_P_HWCOORD | \
>  					 ACPI_PDC_P_FFH)
> 
>  #define ACPI_PDC_C_CAPABILITY_SMP	(ACPI_PDC_SMP_C2C3  | \
> @@ -30,4 +34,17 @@
>  					 ACPI_PDC_C_C1_FFH  | \
>  					 ACPI_PDC_C_C2C3_FFH)
> 
> +#define ACPI_PDC_C_MASK			(ACPI_PDC_C_C1_HALT | \
> +					 ACPI_PDC_C_C1_FFH | \
> +					 ACPI_PDC_SMP_C2C3 | \
> +					 ACPI_PDC_SMP_C_SWCOORD | \
> +					 ACPI_PDC_C_C2C3_FFH)
> +
> +#define ACPI_PDC_P_MASK			(ACPI_PDC_P_FFH | \
> +					 ACPI_PDC_SMP_P_SWCOORD | \
> +					 ACPI_PDC_SMP_P_HWCOORD)
> +
> +#define ACPI_PDC_T_MASK			(ACPI_PDC_T_FFH | \
> +					 ACPI_PDC_SMP_T_SWCOORD)
> +
>  #endif				/* __PDC_INTEL_H__ */
> --- a/xen/include/asm-x86/cpufeature.h
> +++ b/xen/include/asm-x86/cpufeature.h
> @@ -152,6 +152,10 @@
>  #define boot_cpu_has(bit)	test_bit(bit, boot_cpu_data.x86_capability)
>  #define cpufeat_mask(idx)       (1u << ((idx) & 31))
> 
> +#define CPUID_MWAIT_LEAF                5
> +#define CPUID5_ECX_EXTENSIONS_SUPPORTED 0x1
> +#define CPUID5_ECX_INTERRUPT_BREAK      0x2
> +
>  #ifdef __i386__
>  #define cpu_has_vme		boot_cpu_has(X86_FEATURE_VME)
>  #define cpu_has_de		boot_cpu_has(X86_FEATURE_DE)
> --- a/xen/include/public/platform.h
> +++ b/xen/include/public/platform.h
> @@ -304,6 +304,7 @@ DEFINE_XEN_GUEST_HANDLE(xenpf_getidletim
>  #define XEN_PM_CX   0
>  #define XEN_PM_PX   1
>  #define XEN_PM_TX   2
> +#define XEN_PM_PDC  3
> 
>  /* Px sub info type */
>  #define XEN_PX_PCT   1
> @@ -401,6 +402,7 @@ struct xenpf_set_processor_pminfo {
>      union {
>          struct xen_processor_power          power;/* Cx: _CST/_CSD */
>          struct xen_processor_performance    perf; /* Px:
> _PPC/_PCT/_PSS/_PSD */
> +        XEN_GUEST_HANDLE(uint32)            pdc;  /* _PDC */
>      } u;
>  };
>  typedef struct xenpf_set_processor_pminfo xenpf_set_processor_pminfo_t;
> --- a/xen/include/xen/acpi.h
> +++ b/xen/include/xen/acpi.h
> @@ -322,6 +322,8 @@ static inline int acpi_boot_table_init(v
> 
>  #endif 	/*!CONFIG_ACPI_BOOT*/
> 
> +int get_cpu_id(u32 acpi_id);
> +
>  unsigned int acpi_register_gsi (u32 gsi, int edge_level, int
active_high_low);
>  int acpi_gsi_to_irq (u32 gsi, unsigned int *irq);
> 
> @@ -358,6 +360,9 @@ static inline unsigned int acpi_get_csta
>  static inline void acpi_set_cstate_limit(unsigned int new_limit) { return;
}
>  #endif
> 
> +int acpi_set_pdc_bits(u32 acpi_id, XEN_GUEST_HANDLE(uint32));
> +int arch_acpi_set_pdc_bits(u32 acpi_id, u32 *, u32 mask);
> +
>  #ifdef CONFIG_ACPI_NUMA
>  int acpi_get_pxm(acpi_handle handle);
>  #else
> 

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Xen devel - Aug 2011 - [PATCH] ACPI: add _PDC input override mechanism

[Xen-devel] [PATCH] ACPI: add _PDC input override mechanism

[Xen-devel] RE: [PATCH] ACPI: add _PDC input override mechanism