linux-imx

// SPDX-License-Identifier: GPL-2.0

/*

 * CPU subsystem support

 */

​

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/init.h>

#include <linux/sched.h>

#include <linux/cpu.h>

#include <linux/topology.h>

#include <linux/device.h>

#include <linux/node.h>

#include <linux/gfp.h>

#include <linux/slab.h>

#include <linux/percpu.h>

#include <linux/acpi.h>

#include <linux/of.h>

#include <linux/cpufeature.h>

#include <linux/tick.h>

#include <linux/pm_qos.h>

#include <linux/sched/isolation.h>

​

#include "base.h"

​

static DEFINE_PER_CPU(struct device *, cpu_sys_devices);

​

static int cpu_subsys_match(struct device *dev, struct device_driver *drv)

{

    /* ACPI style match is the only one that may succeed. */

    if (acpi_driver_match_device(dev, drv))

        return 1;

​

    return 0;

}

​

#ifdef CONFIG_HOTPLUG_CPU

static void change_cpu_under_node(struct cpu *cpu,

            unsigned int from_nid, unsigned int to_nid)

{

    int cpuid = cpu->dev.id;

    unregister_cpu_under_node(cpuid, from_nid);

    register_cpu_under_node(cpuid, to_nid);

    cpu->node_id = to_nid;

}

​

static int cpu_subsys_online(struct device *dev)

{

    struct cpu *cpu = container_of(dev, struct cpu, dev);

    int cpuid = dev->id;

    int from_nid, to_nid;

    int ret;

​

    from_nid = cpu_to_node(cpuid);

    if (from_nid == NUMA_NO_NODE)

        return -ENODEV;

​

    ret = cpu_up(cpuid);

    /*

     * When hot adding memory to memoryless node and enabling a cpu

     * on the node, node number of the cpu may internally change.

     */

    to_nid = cpu_to_node(cpuid);