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PM / devfreq: passive: Keep cpufreq_policy for possible cpus

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The passive governor requires the cpu data to get the next target frequency
of devfreq device if depending on cpu. In order to reduce the unnecessary
memory data, keep cpufreq_policy data for possible cpus instead of NR_CPU.

Tested-by: Chen-Yu Tsai <wenst@chromium.org>
Tested-by: Johnson Wang <johnson.wang@mediatek.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
This commit is contained in:
Chanwoo Choi 2022-04-27 03:49:19 +09:00
parent 05723e7123
commit 26984d9d58
3 changed files with 64 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/devfreq/governor.h
View File

@ -49,6 +49,7 @@
/**
* struct devfreq_cpu_data - Hold the per-cpu data
* @node: list node
* @dev: reference to cpu device.
* @first_cpu: the cpumask of the first cpu of a policy.
* @opp_table: reference to cpu opp table.
@ -60,6 +61,8 @@
* This is auto-populated by the governor.
*/
struct devfreq_cpu_data {
struct list_head node;
struct device *dev;
unsigned int first_cpu;

75
drivers/devfreq/governor_passive.c
View File

@ -1,4 +1,4 @@
// SPDX-License-Identifier: GPL-2.0-only
// SPDX-License-Identifier: GPL-2.0-only
/*
* linux/drivers/devfreq/governor_passive.c
*
@ -18,6 +18,22 @@
#define HZ_PER_KHZ 1000
static struct devfreq_cpu_data *
get_parent_cpu_data(struct devfreq_passive_data *p_data,
struct cpufreq_policy *policy)
{
struct devfreq_cpu_data *parent_cpu_data;
if (!p_data || !policy)
return NULL;
list_for_each_entry(parent_cpu_data, &p_data->cpu_data_list, node)
if (parent_cpu_data->first_cpu == cpumask_first(policy->related_cpus))
return parent_cpu_data;
return NULL;
}
static unsigned long get_target_freq_by_required_opp(struct device *p_dev,
struct opp_table *p_opp_table,
struct opp_table *opp_table,
@ -51,14 +67,24 @@ static int get_target_freq_with_cpufreq(struct devfreq *devfreq,
struct devfreq_passive_data *p_data =
(struct devfreq_passive_data *)devfreq->data;
struct devfreq_cpu_data *parent_cpu_data;
struct cpufreq_policy *policy;
unsigned long cpu, cpu_cur, cpu_min, cpu_max, cpu_percent;
unsigned long dev_min, dev_max;
unsigned long freq = 0;
int ret = 0;
for_each_online_cpu(cpu) {
parent_cpu_data = p_data->parent_cpu_data[cpu];
if (!parent_cpu_data || parent_cpu_data->first_cpu != cpu)
policy = cpufreq_cpu_get(cpu);
if (!policy) {
ret = -EINVAL;
continue;
}
parent_cpu_data = get_parent_cpu_data(p_data, policy);
if (!parent_cpu_data) {
cpufreq_cpu_put(policy);
continue;
}
/* Get target freq via required opps */
cpu_cur = parent_cpu_data->cur_freq * HZ_PER_KHZ;
@ -67,6 +93,7 @@ static int get_target_freq_with_cpufreq(struct devfreq *devfreq,
devfreq->opp_table, &cpu_cur);
if (freq) {
*target_freq = max(freq, *target_freq);
cpufreq_cpu_put(policy);
continue;
}
@ -81,9 +108,10 @@ static int get_target_freq_with_cpufreq(struct devfreq *devfreq,
freq = dev_min + mult_frac(dev_max - dev_min, cpu_percent, 100);
*target_freq = max(freq, *target_freq);
cpufreq_cpu_put(policy);
}
return 0;
return ret;
}
static int get_target_freq_with_devfreq(struct devfreq *devfreq,
@ -168,12 +196,11 @@ static int cpufreq_passive_notifier_call(struct notifier_block *nb,
unsigned int cur_freq;
int ret;
if (event != CPUFREQ_POSTCHANGE || !freqs ||
!p_data->parent_cpu_data[freqs->policy->cpu])
if (event != CPUFREQ_POSTCHANGE || !freqs)
return 0;
parent_cpu_data = p_data->parent_cpu_data[freqs->policy->cpu];
if (parent_cpu_data->cur_freq == freqs->new)
parent_cpu_data = get_parent_cpu_data(p_data, freqs->policy);
if (!parent_cpu_data || parent_cpu_data->cur_freq == freqs->new)
return 0;
cur_freq = parent_cpu_data->cur_freq;
@ -196,7 +223,7 @@ static int cpufreq_passive_unregister_notifier(struct devfreq *devfreq)
struct devfreq_passive_data *p_data
= (struct devfreq_passive_data *)devfreq->data;
struct devfreq_cpu_data *parent_cpu_data;
int cpu, ret;
int cpu, ret = 0;
if (p_data->nb.notifier_call) {
ret = cpufreq_unregister_notifier(&p_data->nb,
@ -206,16 +233,26 @@ static int cpufreq_passive_unregister_notifier(struct devfreq *devfreq)
}
for_each_possible_cpu(cpu) {
parent_cpu_data = p_data->parent_cpu_data[cpu];
if (!parent_cpu_data)
struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
if (!policy) {
ret = -EINVAL;
continue;
}
parent_cpu_data = get_parent_cpu_data(p_data, policy);
if (!parent_cpu_data) {
cpufreq_cpu_put(policy);
continue;
}
list_del(&parent_cpu_data->node);
if (parent_cpu_data->opp_table)
dev_pm_opp_put_opp_table(parent_cpu_data->opp_table);
kfree(parent_cpu_data);
cpufreq_cpu_put(policy);
}
return 0;
return ret;
}
static int cpufreq_passive_register_notifier(struct devfreq *devfreq)
@ -230,6 +267,9 @@ static int cpufreq_passive_register_notifier(struct devfreq *devfreq)
unsigned int cpu;
int ret;
p_data->cpu_data_list
= (struct list_head)LIST_HEAD_INIT(p_data->cpu_data_list);
p_data->nb.notifier_call = cpufreq_passive_notifier_call;
ret = cpufreq_register_notifier(&p_data->nb, CPUFREQ_TRANSITION_NOTIFIER);
if (ret) {
@ -239,15 +279,18 @@ static int cpufreq_passive_register_notifier(struct devfreq *devfreq)
}
for_each_possible_cpu(cpu) {
if (p_data->parent_cpu_data[cpu])
continue;
policy = cpufreq_cpu_get(cpu);
if (!policy) {
ret = -EPROBE_DEFER;
goto err;
}
parent_cpu_data = get_parent_cpu_data(p_data, policy);
if (parent_cpu_data) {
cpufreq_cpu_put(policy);
continue;
}
parent_cpu_data = kzalloc(sizeof(*parent_cpu_data),
GFP_KERNEL);
if (!parent_cpu_data) {
@ -276,7 +319,7 @@ static int cpufreq_passive_register_notifier(struct devfreq *devfreq)
parent_cpu_data->min_freq = policy->cpuinfo.min_freq;
parent_cpu_data->max_freq = policy->cpuinfo.max_freq;
p_data->parent_cpu_data[cpu] = parent_cpu_data;
list_add_tail(&parent_cpu_data->node, &p_data->cpu_data_list);
cpufreq_cpu_put(policy);
}

4
include/linux/devfreq.h
View File

@ -309,7 +309,7 @@ enum devfreq_parent_dev_type {
* @this: the devfreq instance of own device.
* @nb: the notifier block for DEVFREQ_TRANSITION_NOTIFIER or
* CPUFREQ_TRANSITION_NOTIFIER list.
* @parent_cpu_data: the state min/max/current frequency of all online cpu's.
* @cpu_data_list: the list of cpu frequency data for all cpufreq_policy.
*
* The devfreq_passive_data have to set the devfreq instance of parent
* device with governors except for the passive governor. But, don't need to
@ -329,7 +329,7 @@ struct devfreq_passive_data {
/* For passive governor's internal use. Don't need to set them */
struct devfreq *this;
struct notifier_block nb;
struct devfreq_cpu_data *parent_cpu_data[NR_CPUS];
struct list_head cpu_data_list;
};
#endif