linux-imx

// SPDX-License-Identifier: GPL-2.0

/*

 * Arch specific cpu topology information

 *

 * Copyright (C) 2016, ARM Ltd.

 * Written by: Juri Lelli, ARM Ltd.

 */

​

#include <linux/acpi.h>

#include <linux/arch_topology.h>

#include <linux/cpu.h>

#include <linux/cpufreq.h>

#include <linux/device.h>

#include <linux/of.h>

#include <linux/slab.h>

#include <linux/string.h>

#include <linux/sched/topology.h>

#include <linux/cpuset.h>

​

DEFINE_PER_CPU(unsigned long, freq_scale) = SCHED_CAPACITY_SCALE;

​

void arch_set_freq_scale(struct cpumask *cpus, unsigned long cur_freq,

             unsigned long max_freq)

{

    unsigned long scale;

    int i;

​

    scale = (cur_freq << SCHED_CAPACITY_SHIFT) / max_freq;

​

    for_each_cpu(i, cpus)

        per_cpu(freq_scale, i) = scale;

}

​

static DEFINE_MUTEX(cpu_scale_mutex);

DEFINE_PER_CPU(unsigned long, cpu_scale) = SCHED_CAPACITY_SCALE;

​

void topology_set_cpu_scale(unsigned int cpu, unsigned long capacity)

{

    per_cpu(cpu_scale, cpu) = capacity;

}

​

static ssize_t cpu_capacity_show(struct device *dev,

                 struct device_attribute *attr,

                 char *buf)

{

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

​

    return sprintf(buf, "%lu\n", topology_get_cpu_scale(NULL, cpu->dev.id));

}

​

static void update_topology_flags_workfn(struct work_struct *work);

static DECLARE_WORK(update_topology_flags_work, update_topology_flags_workfn);

​

static ssize_t cpu_capacity_store(struct device *dev,

                  struct device_attribute *attr,

                  const char *buf,

                  size_t count)

{

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

    int this_cpu = cpu->dev.id;

    int i;

    unsigned long new_capacity;

    ssize_t ret;