linux-imx

/*

 * xen-acpi-pad.c - Xen pad interface

 *

 * Copyright (c) 2012, Intel Corporation.

 *    Author: Liu, Jinsong <jinsong.liu@intel.com>

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms and conditions of the GNU General Public License,

 * version 2, as published by the Free Software Foundation.

 *

 * This program is distributed in the hope it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for

 * more details.

 */

​

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

​

#include <linux/kernel.h>

#include <linux/types.h>

#include <linux/acpi.h>

#include <xen/xen.h>

#include <xen/interface/version.h>

#include <xen/xen-ops.h>

#include <asm/xen/hypercall.h>

​

#define ACPI_PROCESSOR_AGGREGATOR_CLASS "acpi_pad"

#define ACPI_PROCESSOR_AGGREGATOR_DEVICE_NAME "Processor Aggregator"

#define ACPI_PROCESSOR_AGGREGATOR_NOTIFY 0x80

static DEFINE_MUTEX(xen_cpu_lock);

​

static int xen_acpi_pad_idle_cpus(unsigned int idle_nums)

{

    struct xen_platform_op op;

​

    op.cmd = XENPF_core_parking;

    op.u.core_parking.type = XEN_CORE_PARKING_SET;

    op.u.core_parking.idle_nums = idle_nums;

​

    return HYPERVISOR_platform_op(&op);

}

​

static int xen_acpi_pad_idle_cpus_num(void)

{

    struct xen_platform_op op;

​

    op.cmd = XENPF_core_parking;

    op.u.core_parking.type = XEN_CORE_PARKING_GET;

​

    return HYPERVISOR_platform_op(&op)

           ?: op.u.core_parking.idle_nums;

}

​

/*

 * Query firmware how many CPUs should be idle

 * return -1 on failure

 */

static int acpi_pad_pur(acpi_handle handle)

{

    struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};

    union acpi_object *package;

    int num = -1;

​