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xen/acpi: ACPI PAD driver

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PAD is acpi Processor Aggregator Device which provides a control point
that enables the platform to perform specific processor configuration
and control that applies to all processors in the platform.

This patch is to implement Xen acpi pad logic. When running under Xen
virt platform, native pad driver would not work. Instead Xen pad driver,
a self-contained and thin logic level, would take over acpi pad logic.

When acpi pad notify OSPM, xen pad logic intercept and parse _PUR object
to get the expected idle cpu number, and then hypercall to hypervisor.
Xen hypervisor would then do the rest work, say, core parking, to idle
specific number of cpus on its own policy.

Signed-off-by: Jan Beulich <JBeulich@suse.com>
Signed-off-by: Liu Jinsong <jinsong.liu@intel.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Liu, Jinsong
2012-11-08 05:41:13 +00:00
committed by Konrad Rzeszutek Wilk
parent b3e40b72bb
commit 92e3229dcd
4 changed files with 215 additions and 1 deletions
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17
include/xen/interface/platform.h
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@@ -324,6 +324,22 @@ struct xenpf_cpu_ol {
};
DEFINE_GUEST_HANDLE_STRUCT(xenpf_cpu_ol);
/*
* CMD 58 and 59 are reserved for cpu hotadd and memory hotadd,
* which are already occupied at Xen hypervisor side.
*/
#define XENPF_core_parking 60
struct xenpf_core_parking {
/* IN variables */
#define XEN_CORE_PARKING_SET 1
#define XEN_CORE_PARKING_GET 2
uint32_t type;
/* IN variables: set cpu nums expected to be idled */
/* OUT variables: get cpu nums actually be idled */
uint32_t idle_nums;
};
DEFINE_GUEST_HANDLE_STRUCT(xenpf_core_parking);
struct xen_platform_op {
uint32_t cmd;
uint32_t interface_version; /* XENPF_INTERFACE_VERSION */
@@ -341,6 +357,7 @@ struct xen_platform_op {
struct xenpf_set_processor_pminfo set_pminfo;
struct xenpf_pcpuinfo pcpu_info;
struct xenpf_cpu_ol cpu_ol;
struct xenpf_core_parking core_parking;
uint8_t pad[128];
} u;
};