linux/drivers/xen/pcpu.c

/******************************************************************************
 * pcpu.c
 * Management physical cpu in dom0, get pcpu info and provide sys interface
 *
 * Copyright (c) 2012 Intel Corporation
 * Author: Liu, Jinsong <[email protected]>
 * Author: Jiang, Yunhong <[email protected]>
 *
 * 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) …

#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>

#ifdef CONFIG_ACPI
#include <acpi/processor.h>
#endif

/*
 * @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 { … };

static const struct bus_type xen_pcpu_subsys = …;

static DEFINE_MUTEX(xen_pcpu_lock);

static LIST_HEAD(xen_pcpus);

static int xen_pcpu_down(uint32_t cpu_id)
{ … }

static int xen_pcpu_up(uint32_t cpu_id)
{ … }

static ssize_t online_show(struct device *dev,
			   struct device_attribute *attr,
			   char *buf)
{ … }

static ssize_t __ref online_store(struct device *dev,
				  struct device_attribute *attr,
				  const char *buf, size_t count)
{ … }
static DEVICE_ATTR_RW(online);

static struct attribute *pcpu_dev_attrs[] = …;

static umode_t pcpu_dev_is_visible(struct kobject *kobj,
				   struct attribute *attr, int idx)
{ … }

static const struct attribute_group pcpu_dev_group = …;

static const struct attribute_group *pcpu_dev_groups[] = …;

static bool xen_pcpu_online(uint32_t flags)
{ … }

static void pcpu_online_status(struct xenpf_pcpuinfo *info,
			       struct pcpu *pcpu)
{ … }

static struct pcpu *get_pcpu(uint32_t cpu_id)
{ … }

static void pcpu_release(struct device *dev)
{ … }

static void unregister_and_remove_pcpu(struct pcpu *pcpu)
{ … }

static int register_pcpu(struct pcpu *pcpu)
{ … }

static struct pcpu *create_and_register_pcpu(struct xenpf_pcpuinfo *info)
{ … }

/*
 * Caller should hold the xen_pcpu_lock
 */
static int sync_pcpu(uint32_t cpu, uint32_t *max_cpu)
{ … }

/*
 * Sync dom0's pcpu information with xen hypervisor's
 */
static int xen_sync_pcpus(void)
{ … }

static void xen_pcpu_work_fn(struct work_struct *work)
{ … }
static DECLARE_WORK(xen_pcpu_work, xen_pcpu_work_fn);

static irqreturn_t xen_pcpu_interrupt(int irq, void *dev_id)
{ … }

static int __init xen_pcpu_init(void)
{ … }
arch_initcall(xen_pcpu_init);

#ifdef CONFIG_ACPI
bool __init xen_processor_present(uint32_t acpi_id)
{ … }

void xen_sanitize_proc_cap_bits(uint32_t *cap)
{ … }
#endif