linux-imx

/******************************************************************************

 * pcpu.c

 * Management physical cpu in dom0, get pcpu info and provide sys interface

 *

 * Copyright (c) 2012 Intel Corporation

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

 * Author: Jiang, Yunhong <yunhong.jiang@intel.com>

 *

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

 * modify it under the terms of the GNU General Public License version 2

 * as published by the Free Software Foundation; or, when distributed

 * separately from the Linux kernel or incorporated into other

 * software packages, subject to the following license:

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this source file (the "Software"), to deal in the Software without

 * restriction, including without limitation the rights to use, copy, modify,

 * merge, publish, distribute, sublicense, and/or sell copies of the Software,

 * and to permit persons to whom the Software is furnished to do so, subject to

 * the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING

 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS

 * IN THE SOFTWARE.

 */

​

#define pr_fmt(fmt) "xen_cpu: " fmt

​

#include <linux/interrupt.h>

#include <linux/spinlock.h>

#include <linux/cpu.h>

#include <linux/stat.h>

#include <linux/capability.h>

​

#include <xen/xen.h>

#include <xen/acpi.h>

#include <xen/xenbus.h>

#include <xen/events.h>

#include <xen/interface/platform.h>

#include <asm/xen/hypervisor.h>

#include <asm/xen/hypercall.h>

​

​

/*

 * @cpu_id: Xen physical cpu logic number

 * @flags: Xen physical cpu status flag

 * - XEN_PCPU_FLAGS_ONLINE: cpu is online

 * - XEN_PCPU_FLAGS_INVALID: cpu is not present

 */

struct pcpu {

    struct list_head list;

    struct device dev;

    uint32_t cpu_id;

    uint32_t flags;

};

​

static struct bus_type xen_pcpu_subsys = {

    .name = "xen_cpu",

    .dev_name = "xen_cpu",

};

​

static DEFINE_MUTEX(xen_pcpu_lock);

​

static LIST_HEAD(xen_pcpus);

​

static int xen_pcpu_down(uint32_t cpu_id)

{

    struct xen_platform_op op = {

        .cmd            = XENPF_cpu_offline,

        .interface_version  = XENPF_INTERFACE_VERSION,

        .u.cpu_ol.cpuid     = cpu_id,

    };

​

    return HYPERVISOR_platform_op(&op);

}

​

static int xen_pcpu_up(uint32_t cpu_id)

{

    struct xen_platform_op op = {

        .cmd            = XENPF_cpu_online,

        .interface_version  = XENPF_INTERFACE_VERSION,

        .u.cpu_ol.cpuid     = cpu_id,

    };

​

    return HYPERVISOR_platform_op(&op);