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/* Copyright (c) 2019 The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that 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.
*
* RMNET Data Smart Hash stamping solution
*
*/
#include <linux/module.h>
#include "rmnet_shs.h"
#include "rmnet_shs_freq.h"
#include <linux/cpufreq.h>
#include <linux/cpu.h>
#define MAX_FREQ INT_MAX
#define MIN_FREQ 0
#define BOOST_FREQ MAX_FREQ
struct cpu_freq {
unsigned int freq_floor;
unsigned int freq_ceil;
};
unsigned int rmnet_shs_freq_enable __read_mostly = 1;
module_param(rmnet_shs_freq_enable, uint, 0644);
MODULE_PARM_DESC(rmnet_shs_freq_enable, "Enable/disable freq boost feature");
struct workqueue_struct *shs_boost_wq;
static DEFINE_PER_CPU(struct cpu_freq, cpu_boosts);
static struct work_struct boost_cpu;
static int rmnet_shs_freq_notify(struct notifier_block *nb,
unsigned long val,
void *data)
{
struct cpufreq_policy *policy = data;
unsigned int cpu = policy->cpu;
struct cpu_freq *boost = &per_cpu(cpu_boosts, cpu);
switch (val) {
case CPUFREQ_ADJUST:
if (rmnet_shs_freq_enable) {
cpufreq_verify_within_limits(policy,
boost->freq_floor,
MAX_FREQ);
trace_rmnet_freq_update(cpu, policy->min,
policy->max);
}
break;
}
return NOTIFY_OK;
}
static struct notifier_block freq_boost_nb = {
.notifier_call = rmnet_shs_freq_notify,
};
static void update_cpu_policy(struct work_struct *work)
{
unsigned int i;
get_online_cpus();
for_each_online_cpu(i) {
cpufreq_update_policy(i);
}
put_online_cpus();
}
void rmnet_shs_reset_freq(void)
{
struct cpu_freq *boost;
int i;
for_each_possible_cpu(i) {
boost = &per_cpu(cpu_boosts, i);
boost->freq_floor = MIN_FREQ;
boost->freq_ceil = MAX_FREQ;
}
}
void rmnet_shs_boost_cpus(void)
{
struct cpu_freq *boost;
int i;
for_each_possible_cpu(i) {
if ((1 << i) & PERF_MASK)
continue;
boost = &per_cpu(cpu_boosts, i);
boost->freq_floor = BOOST_FREQ;
boost->freq_ceil = MAX_FREQ;
trace_rmnet_freq_boost(i, boost->freq_floor);
}
if (work_pending(&boost_cpu))
return;
if (shs_boost_wq)
queue_work(shs_boost_wq, &boost_cpu);
}
void rmnet_shs_reset_cpus(void)
{
struct cpu_freq *boost;
int i;
for_each_possible_cpu(i) {
if ((1 << i) & PERF_MASK)
continue;
boost = &per_cpu(cpu_boosts, i);
boost->freq_floor = MIN_FREQ;
boost->freq_ceil = MAX_FREQ;
trace_rmnet_freq_reset(i, boost->freq_floor);
}
if (work_pending(&boost_cpu))
return;
if (shs_boost_wq)
queue_work(shs_boost_wq, &boost_cpu);
}
int rmnet_shs_freq_init(void)
{
if (!shs_boost_wq)
shs_boost_wq = alloc_workqueue("shs_boost_wq", WQ_HIGHPRI, 0);
if (!shs_boost_wq)
return -EFAULT;
INIT_WORK(&boost_cpu, update_cpu_policy);
if (rmnet_shs_freq_enable)
cpufreq_register_notifier(&freq_boost_nb,
CPUFREQ_POLICY_NOTIFIER);
rmnet_shs_reset_freq();
return 0;
}
int rmnet_shs_freq_exit(void)
{
rmnet_shs_reset_freq();
cancel_work_sync(&boost_cpu);
if (shs_boost_wq) {
destroy_workqueue(shs_boost_wq);
shs_boost_wq = NULL;
}
if (rmnet_shs_freq_enable)
cpufreq_unregister_notifier(&freq_boost_nb,
CPUFREQ_POLICY_NOTIFIER);
return 0;
}
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