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cpufreq: governor: Make governor private data per-policy 

Some fields in struct od_cpu_dbs_info_s and struct cs_cpu_dbs_info_s
are only used for a limited set of CPUs.  Namely, if a policy is
shared between multiple CPUs, those fields will only be used for one
of them (policy->cpu).  This means that they really are per-policy
rather than per-CPU and holding room for them in per-CPU data
structures is generally wasteful.  Also moving those fields into
per-policy data structures will allow some significant simplifications
to be made going forward.

For this reason, introduce struct cs_policy_dbs_info and
struct od_policy_dbs_info to hold those fields.  Define each of the
new structures as an extension of struct policy_dbs_info (such that
struct policy_dbs_info is embedded in each of them) and introduce
new ->alloc and ->free governor callbacks to allocate and free
those structures, respectively, such that ->alloc() will return
a pointer to the struct policy_dbs_info embedded in the allocated
data structure and ->free() will take that pointer as its argument.

With that, modify the code accessing the data fields in question
in per-CPU data objects to look for them in the new structures
via the struct policy_dbs_info pointer available to it and drop
them from struct od_cpu_dbs_info_s and struct cs_cpu_dbs_info_s.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
This commit is contained in:
Rafael J. Wysocki 2016-02-18 18:40:14 +01:00
parent d1db75fffc
commit 7d5a9956af
6 changed files with 87 additions and 28 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/cpufreq/amd_freq_sensitivity.c
View File

@ -21,7 +21,7 @@
#include <asm/msr.h>
#include <asm/cpufeature.h>
#include "cpufreq_governor.h"
#include "cpufreq_ondemand.h"
#define MSR_AMD64_FREQ_SENSITIVITY_ACTUAL 0xc0010080
#define MSR_AMD64_FREQ_SENSITIVITY_REFERENCE 0xc0010081
@ -48,8 +48,7 @@ static unsigned int amd_powersave_bias_target(struct cpufreq_policy *policy,
struct policy_dbs_info *policy_dbs = policy->governor_data;
struct dbs_data *od_data = policy_dbs->dbs_data;
struct od_dbs_tuners *od_tuners = od_data->tuners;
struct od_cpu_dbs_info_s *od_info =
dbs_governor_of(policy)->get_cpu_dbs_info_s(policy->cpu);
struct od_policy_dbs_info *od_info = to_dbs_info(policy_dbs);
if (!od_info->freq_table)
return freq_next;

34
drivers/cpufreq/cpufreq_conservative.c
View File

@ -14,6 +14,17 @@
#include <linux/slab.h>
#include "cpufreq_governor.h"
struct cs_policy_dbs_info {
struct policy_dbs_info policy_dbs;
unsigned int down_skip;
unsigned int requested_freq;
};
static inline struct cs_policy_dbs_info *to_dbs_info(struct policy_dbs_info *policy_dbs)
{
return container_of(policy_dbs, struct cs_policy_dbs_info, policy_dbs);
}
/* Conservative governor macros */
#define DEF_FREQUENCY_UP_THRESHOLD (80)
#define DEF_FREQUENCY_DOWN_THRESHOLD (20)
@ -48,8 +59,8 @@ static inline unsigned int get_freq_target(struct cs_dbs_tuners *cs_tuners,
*/
static unsigned int cs_dbs_timer(struct cpufreq_policy *policy)
{
struct cs_cpu_dbs_info_s *dbs_info = &per_cpu(cs_cpu_dbs_info, policy->cpu);
struct policy_dbs_info *policy_dbs = policy->governor_data;
struct cs_policy_dbs_info *dbs_info = to_dbs_info(policy_dbs);
struct dbs_data *dbs_data = policy_dbs->dbs_data;
struct cs_dbs_tuners *cs_tuners = dbs_data->tuners;
unsigned int load = dbs_update(policy);
@ -238,6 +249,19 @@ static struct attribute *cs_attributes[] = {
/************************** sysfs end ************************/
static struct policy_dbs_info *cs_alloc(void)
{
struct cs_policy_dbs_info *dbs_info;
dbs_info = kzalloc(sizeof(*dbs_info), GFP_KERNEL);
return dbs_info ? &dbs_info->policy_dbs : NULL;
}
static void cs_free(struct policy_dbs_info *policy_dbs)
{
kfree(to_dbs_info(policy_dbs));
}
static int cs_init(struct dbs_data *dbs_data, bool notify)
{
struct cs_dbs_tuners *tuners;
@ -276,7 +300,7 @@ static void cs_exit(struct dbs_data *dbs_data, bool notify)
static void cs_start(struct cpufreq_policy *policy)
{
struct cs_cpu_dbs_info_s *dbs_info = &per_cpu(cs_cpu_dbs_info, policy->cpu);
struct cs_policy_dbs_info *dbs_info = to_dbs_info(policy->governor_data);
dbs_info->down_skip = 0;
dbs_info->requested_freq = policy->cur;
@ -294,6 +318,8 @@ static struct dbs_governor cs_dbs_gov = {
.kobj_type = { .default_attrs = cs_attributes },
.get_cpu_cdbs = get_cpu_cdbs,
.gov_dbs_timer = cs_dbs_timer,
.alloc = cs_alloc,
.free = cs_free,
.init = cs_init,
.exit = cs_exit,
.start = cs_start,
@ -305,9 +331,8 @@ static int dbs_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
void *data)
{
struct cpufreq_freqs *freq = data;
struct cs_cpu_dbs_info_s *dbs_info =
&per_cpu(cs_cpu_dbs_info, freq->cpu);
struct cpufreq_policy *policy = cpufreq_cpu_get_raw(freq->cpu);
struct cs_policy_dbs_info *dbs_info;
if (!policy)
return 0;
@ -316,6 +341,7 @@ static int dbs_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
if (policy->governor != CPU_FREQ_GOV_CONSERVATIVE)
return 0;
dbs_info = to_dbs_info(policy->governor_data);
/*
* we only care if our internally tracked freq moves outside the 'valid'
* ranges of frequency available to us otherwise we do not change it

7
drivers/cpufreq/cpufreq_governor.c
View File

@ -385,8 +385,8 @@ static struct policy_dbs_info *alloc_policy_dbs_info(struct cpufreq_policy *poli
struct policy_dbs_info *policy_dbs;
int j;
/* Allocate memory for the common information for policy->cpus */
policy_dbs = kzalloc(sizeof(*policy_dbs), GFP_KERNEL);
/* Allocate memory for per-policy governor data. */
policy_dbs = gov->alloc();
if (!policy_dbs)
return NULL;
@ -421,7 +421,7 @@ static void free_policy_dbs_info(struct cpufreq_policy *policy,
j_cdbs->policy_dbs = NULL;
j_cdbs->update_util.func = NULL;
}
kfree(policy_dbs);
gov->free(policy_dbs);
}
static int cpufreq_governor_init(struct cpufreq_policy *policy)
@ -582,7 +582,6 @@ static int cpufreq_governor_start(struct cpufreq_policy *policy)
static int cpufreq_governor_stop(struct cpufreq_policy *policy)
{
gov_cancel_work(policy);
return 0;
}

9
drivers/cpufreq/cpufreq_governor.h
View File

@ -157,17 +157,10 @@ struct cpu_dbs_info {
struct od_cpu_dbs_info_s {
struct cpu_dbs_info cdbs;
struct cpufreq_frequency_table *freq_table;
unsigned int freq_lo;
unsigned int freq_lo_delay_us;
unsigned int freq_hi_delay_us;
unsigned int sample_type:1;
};
struct cs_cpu_dbs_info_s {
struct cpu_dbs_info cdbs;
unsigned int down_skip;
unsigned int requested_freq;
};
/* Per policy Governors sysfs tunables */
@ -193,6 +186,8 @@ struct dbs_governor {
struct cpu_dbs_info *(*get_cpu_cdbs)(int cpu);
unsigned int (*gov_dbs_timer)(struct cpufreq_policy *policy);
struct policy_dbs_info *(*alloc)(void);
void (*free)(struct policy_dbs_info *policy_dbs);
int (*init)(struct dbs_data *dbs_data, bool notify);
void (*exit)(struct dbs_data *dbs_data, bool notify);
void (*start)(struct cpufreq_policy *policy);

34
drivers/cpufreq/cpufreq_ondemand.c
View File

@ -16,7 +16,8 @@
#include <linux/percpu-defs.h>
#include <linux/slab.h>
#include <linux/tick.h>
#include "cpufreq_governor.h"
#include "cpufreq_ondemand.h"
/* On-demand governor macros */
#define DEF_FREQUENCY_UP_THRESHOLD (80)
@ -69,9 +70,8 @@ static unsigned int generic_powersave_bias_target(struct cpufreq_policy *policy,
unsigned int freq_hi, freq_lo;
unsigned int index = 0;
unsigned int delay_hi_us;
struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info,
policy->cpu);
struct policy_dbs_info *policy_dbs = policy->governor_data;
struct od_policy_dbs_info *dbs_info = to_dbs_info(policy_dbs);
struct dbs_data *dbs_data = policy_dbs->dbs_data;
struct od_dbs_tuners *od_tuners = dbs_data->tuners;
@ -114,10 +114,9 @@ static unsigned int generic_powersave_bias_target(struct cpufreq_policy *policy,
static void ondemand_powersave_bias_init(struct cpufreq_policy *policy)
{
unsigned int cpu = policy->cpu;
struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, cpu);
struct od_policy_dbs_info *dbs_info = to_dbs_info(policy->governor_data);
dbs_info->freq_table = cpufreq_frequency_get_table(cpu);
dbs_info->freq_table = cpufreq_frequency_get_table(policy->cpu);
dbs_info->freq_lo = 0;
}
@ -144,8 +143,8 @@ static void dbs_freq_increase(struct cpufreq_policy *policy, unsigned int freq)
*/
static void od_update(struct cpufreq_policy *policy)
{
struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, policy->cpu);
struct policy_dbs_info *policy_dbs = dbs_info->cdbs.policy_dbs;
struct policy_dbs_info *policy_dbs = policy->governor_data;
struct od_policy_dbs_info *dbs_info = to_dbs_info(policy_dbs);
struct dbs_data *dbs_data = policy_dbs->dbs_data;
struct od_dbs_tuners *od_tuners = dbs_data->tuners;
unsigned int load = dbs_update(policy);
@ -182,7 +181,7 @@ static unsigned int od_dbs_timer(struct cpufreq_policy *policy)
{
struct policy_dbs_info *policy_dbs = policy->governor_data;
struct dbs_data *dbs_data = policy_dbs->dbs_data;
struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, policy->cpu);
struct od_policy_dbs_info *dbs_info = to_dbs_info(policy_dbs);
int sample_type = dbs_info->sample_type;
/* Common NORMAL_SAMPLE setup */
@ -347,6 +346,19 @@ static struct attribute *od_attributes[] = {
/************************** sysfs end ************************/
static struct policy_dbs_info *od_alloc(void)
{
struct od_policy_dbs_info *dbs_info;
dbs_info = kzalloc(sizeof(*dbs_info), GFP_KERNEL);
return dbs_info ? &dbs_info->policy_dbs : NULL;
}
static void od_free(struct policy_dbs_info *policy_dbs)
{
kfree(to_dbs_info(policy_dbs));
}
static int od_init(struct dbs_data *dbs_data, bool notify)
{
struct od_dbs_tuners *tuners;
@ -395,7 +407,7 @@ static void od_exit(struct dbs_data *dbs_data, bool notify)
static void od_start(struct cpufreq_policy *policy)
{
struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, policy->cpu);
struct od_policy_dbs_info *dbs_info = to_dbs_info(policy->governor_data);
dbs_info->sample_type = OD_NORMAL_SAMPLE;
ondemand_powersave_bias_init(policy);
@ -417,6 +429,8 @@ static struct dbs_governor od_dbs_gov = {
.kobj_type = { .default_attrs = od_attributes },
.get_cpu_cdbs = get_cpu_cdbs,
.gov_dbs_timer = od_dbs_timer,
.alloc = od_alloc,
.free = od_free,
.init = od_init,
.exit = od_exit,
.start = od_start,

26
drivers/cpufreq/cpufreq_ondemand.h Normal file
View File

@ -0,0 +1,26 @@
/*
* Header file for CPUFreq ondemand governor and related code.
*
* Copyright (C) 2016, Intel Corporation
* Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
*
* 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.
*/
#include "cpufreq_governor.h"
struct od_policy_dbs_info {
struct policy_dbs_info policy_dbs;
struct cpufreq_frequency_table *freq_table;
unsigned int freq_lo;
unsigned int freq_lo_delay_us;
unsigned int freq_hi_delay_us;
unsigned int sample_type:1;
};
static inline struct od_policy_dbs_info *to_dbs_info(struct policy_dbs_info *policy_dbs)
{
return container_of(policy_dbs, struct od_policy_dbs_info, policy_dbs);
}