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Date: Wed, 03 Feb 2016 16:55:35 -0800
From: Saravana Kannan <skannan@...eaurora.org>
To: "Rafael J. Wysocki" <rjw@...ysocki.net>
CC: Linux PM list <linux-pm@...r.kernel.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Viresh Kumar <viresh.kumar@...aro.org>,
Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
Juri Lelli <juri.lelli@....com>,
Steve Muckle <steve.muckle@...aro.org>
Subject: Re: [PATCH 1/11] cpufreq: Clean up default and fallback governor
setup
On 02/03/2016 03:14 PM, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
>
> The preprocessor magic used for setting the default cpufreq governor
> (and for using the performance governor as a fallback one for that
> matter) is really nasty, so replace it with __weak functions and
> overrides.
>
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> ---
> drivers/cpufreq/cpufreq.c | 37 ++++++++++++++++++---------------
> drivers/cpufreq/cpufreq_conservative.c | 10 +++++---
> drivers/cpufreq/cpufreq_ondemand.c | 34 ++++++++++++++++--------------
> drivers/cpufreq/cpufreq_performance.c | 18 ++++++++++++----
> drivers/cpufreq/cpufreq_powersave.c | 10 +++++---
> drivers/cpufreq/cpufreq_userspace.c | 10 +++++---
> include/linux/cpufreq.h | 25 +---------------------
> 7 files changed, 73 insertions(+), 71 deletions(-)
>
> Index: linux-pm/drivers/cpufreq/cpufreq.c
> ===================================================================
> --- linux-pm.orig/drivers/cpufreq/cpufreq.c
> +++ linux-pm/drivers/cpufreq/cpufreq.c
> @@ -1003,6 +1003,11 @@ static int cpufreq_add_dev_interface(str
> return cpufreq_add_dev_symlink(policy);
> }
>
> +__weak struct cpufreq_governor *cpufreq_default_governor(void)
> +{
> + return NULL;
> +}
> +
> static int cpufreq_init_policy(struct cpufreq_policy *policy)
> {
> struct cpufreq_governor *gov = NULL;
> @@ -1012,11 +1017,14 @@ static int cpufreq_init_policy(struct cp
>
> /* Update governor of new_policy to the governor used before hotplug */
> gov = find_governor(policy->last_governor);
> - if (gov)
> + if (gov) {
> pr_debug("Restoring governor %s for cpu %d\n",
> policy->governor->name, policy->cpu);
> - else
> - gov = CPUFREQ_DEFAULT_GOVERNOR;
> + } else {
> + gov = cpufreq_default_governor();
> + if (!gov)
> + return -ENODATA;
> + }
>
> new_policy.governor = gov;
>
> @@ -1964,21 +1972,16 @@ int cpufreq_driver_target(struct cpufreq
> }
> EXPORT_SYMBOL_GPL(cpufreq_driver_target);
>
> +__weak struct cpufreq_governor *cpufreq_fallback_governor(void)
> +{
> + return NULL;
> +}
> +
> static int __cpufreq_governor(struct cpufreq_policy *policy,
> unsigned int event)
> {
> int ret;
>
> - /* Only must be defined when default governor is known to have latency
> - restrictions, like e.g. conservative or ondemand.
> - That this is the case is already ensured in Kconfig
> - */
> -#ifdef CONFIG_CPU_FREQ_GOV_PERFORMANCE
> - struct cpufreq_governor *gov = &cpufreq_gov_performance;
> -#else
> - struct cpufreq_governor *gov = NULL;
> -#endif
> -
> /* Don't start any governor operations if we are entering suspend */
> if (cpufreq_suspended)
> return 0;
> @@ -1992,12 +1995,14 @@ static int __cpufreq_governor(struct cpu
> if (policy->governor->max_transition_latency &&
> policy->cpuinfo.transition_latency >
> policy->governor->max_transition_latency) {
> - if (!gov)
> - return -EINVAL;
> - else {
> + struct cpufreq_governor *gov = cpufreq_fallback_governor();
> +
> + if (gov) {
> pr_warn("%s governor failed, too long transition latency of HW, fallback to %s governor\n",
> policy->governor->name, gov->name);
> policy->governor = gov;
> + } else {
> + return -EINVAL;
> }
> }
>
> Index: linux-pm/drivers/cpufreq/cpufreq_conservative.c
> ===================================================================
> --- linux-pm.orig/drivers/cpufreq/cpufreq_conservative.c
> +++ linux-pm/drivers/cpufreq/cpufreq_conservative.c
> @@ -26,10 +26,7 @@ static DEFINE_PER_CPU(struct cs_cpu_dbs_
> static int cs_cpufreq_governor_dbs(struct cpufreq_policy *policy,
> unsigned int event);
>
> -#ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE
> -static
> -#endif
> -struct cpufreq_governor cpufreq_gov_conservative = {
> +static struct cpufreq_governor cpufreq_gov_conservative = {
> .name = "conservative",
> .governor = cs_cpufreq_governor_dbs,
> .max_transition_latency = TRANSITION_LATENCY_LIMIT,
> @@ -397,6 +394,11 @@ MODULE_DESCRIPTION("'cpufreq_conservativ
> MODULE_LICENSE("GPL");
>
> #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE
> +struct cpufreq_governor *cpufreq_default_governor(void)
> +{
> + return &cpufreq_gov_conservative;
> +}
> +
> fs_initcall(cpufreq_gov_dbs_init);
> #else
> module_init(cpufreq_gov_dbs_init);
> Index: linux-pm/include/linux/cpufreq.h
> ===================================================================
> --- linux-pm.orig/include/linux/cpufreq.h
> +++ linux-pm/include/linux/cpufreq.h
> @@ -471,29 +471,8 @@ int __cpufreq_driver_target(struct cpufr
> int cpufreq_register_governor(struct cpufreq_governor *governor);
> void cpufreq_unregister_governor(struct cpufreq_governor *governor);
>
> -/* CPUFREQ DEFAULT GOVERNOR */
> -/*
> - * Performance governor is fallback governor if any other gov failed to auto
> - * load due latency restrictions
> - */
> -#ifdef CONFIG_CPU_FREQ_GOV_PERFORMANCE
> -extern struct cpufreq_governor cpufreq_gov_performance;
> -#endif
> -#ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE
> -#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_performance)
> -#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE)
> -extern struct cpufreq_governor cpufreq_gov_powersave;
> -#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_powersave)
> -#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE)
> -extern struct cpufreq_governor cpufreq_gov_userspace;
> -#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_userspace)
> -#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND)
> -extern struct cpufreq_governor cpufreq_gov_ondemand;
> -#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_ondemand)
> -#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE)
> -extern struct cpufreq_governor cpufreq_gov_conservative;
> -#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_conservative)
> -#endif
> +struct cpufreq_governor *cpufreq_default_governor(void);
> +struct cpufreq_governor *cpufreq_fallback_governor(void);
>
> /*********************************************************************
> * FREQUENCY TABLE HELPERS *
> Index: linux-pm/drivers/cpufreq/cpufreq_ondemand.c
> ===================================================================
> --- linux-pm.orig/drivers/cpufreq/cpufreq_ondemand.c
> +++ linux-pm/drivers/cpufreq/cpufreq_ondemand.c
> @@ -553,6 +553,19 @@ static struct common_dbs_data od_dbs_cda
> .mutex = __MUTEX_INITIALIZER(od_dbs_cdata.mutex),
> };
>
> +static int od_cpufreq_governor_dbs(struct cpufreq_policy *policy,
> + unsigned int event)
> +{
> + return cpufreq_governor_dbs(policy, &od_dbs_cdata, event);
> +}
> +
> +static struct cpufreq_governor cpufreq_gov_ondemand = {
> + .name = "ondemand",
> + .governor = od_cpufreq_governor_dbs,
> + .max_transition_latency = TRANSITION_LATENCY_LIMIT,
> + .owner = THIS_MODULE,
> +};
> +
> static void od_set_powersave_bias(unsigned int powersave_bias)
> {
> struct cpufreq_policy *policy;
> @@ -604,22 +617,6 @@ void od_unregister_powersave_bias_handle
> }
> EXPORT_SYMBOL_GPL(od_unregister_powersave_bias_handler);
>
> -static int od_cpufreq_governor_dbs(struct cpufreq_policy *policy,
> - unsigned int event)
> -{
> - return cpufreq_governor_dbs(policy, &od_dbs_cdata, event);
> -}
> -
> -#ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND
> -static
> -#endif
> -struct cpufreq_governor cpufreq_gov_ondemand = {
> - .name = "ondemand",
> - .governor = od_cpufreq_governor_dbs,
> - .max_transition_latency = TRANSITION_LATENCY_LIMIT,
> - .owner = THIS_MODULE,
> -};
> -
> static int __init cpufreq_gov_dbs_init(void)
> {
> return cpufreq_register_governor(&cpufreq_gov_ondemand);
> @@ -637,6 +634,11 @@ MODULE_DESCRIPTION("'cpufreq_ondemand' -
> MODULE_LICENSE("GPL");
>
> #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND
> +struct cpufreq_governor *cpufreq_default_governor(void)
> +{
> + return &cpufreq_gov_ondemand;
> +}
> +
> fs_initcall(cpufreq_gov_dbs_init);
> #else
> module_init(cpufreq_gov_dbs_init);
> Index: linux-pm/drivers/cpufreq/cpufreq_performance.c
> ===================================================================
> --- linux-pm.orig/drivers/cpufreq/cpufreq_performance.c
> +++ linux-pm/drivers/cpufreq/cpufreq_performance.c
> @@ -33,10 +33,7 @@ static int cpufreq_governor_performance(
> return 0;
> }
>
> -#ifdef CONFIG_CPU_FREQ_GOV_PERFORMANCE_MODULE
> -static
> -#endif
> -struct cpufreq_governor cpufreq_gov_performance = {
> +static struct cpufreq_governor cpufreq_gov_performance = {
> .name = "performance",
> .governor = cpufreq_governor_performance,
> .owner = THIS_MODULE,
> @@ -52,6 +49,19 @@ static void __exit cpufreq_gov_performan
> cpufreq_unregister_governor(&cpufreq_gov_performance);
> }
>
> +#ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE
> +struct cpufreq_governor *cpufreq_default_governor(void)
> +{
> + return &cpufreq_gov_performance;
> +}
> +#endif
> +#ifndef CONFIG_CPU_FREQ_GOV_PERFORMANCE_MODULE
> +struct cpufreq_governor *cpufreq_fallback_governor(void)
> +{
> + return &cpufreq_gov_performance;
> +}
> +#endif
> +
> MODULE_AUTHOR("Dominik Brodowski <linux@...do.de>");
> MODULE_DESCRIPTION("CPUfreq policy governor 'performance'");
> MODULE_LICENSE("GPL");
> Index: linux-pm/drivers/cpufreq/cpufreq_powersave.c
> ===================================================================
> --- linux-pm.orig/drivers/cpufreq/cpufreq_powersave.c
> +++ linux-pm/drivers/cpufreq/cpufreq_powersave.c
> @@ -33,10 +33,7 @@ static int cpufreq_governor_powersave(st
> return 0;
> }
>
> -#ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE
> -static
> -#endif
> -struct cpufreq_governor cpufreq_gov_powersave = {
> +static struct cpufreq_governor cpufreq_gov_powersave = {
> .name = "powersave",
> .governor = cpufreq_governor_powersave,
> .owner = THIS_MODULE,
> @@ -57,6 +54,11 @@ MODULE_DESCRIPTION("CPUfreq policy gover
> MODULE_LICENSE("GPL");
>
> #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE
> +struct cpufreq_governor *cpufreq_default_governor(void)
> +{
> + return &cpufreq_gov_powersave;
> +}
> +
> fs_initcall(cpufreq_gov_powersave_init);
> #else
> module_init(cpufreq_gov_powersave_init);
> Index: linux-pm/drivers/cpufreq/cpufreq_userspace.c
> ===================================================================
> --- linux-pm.orig/drivers/cpufreq/cpufreq_userspace.c
> +++ linux-pm/drivers/cpufreq/cpufreq_userspace.c
> @@ -89,10 +89,7 @@ static int cpufreq_governor_userspace(st
> return rc;
> }
>
> -#ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE
> -static
> -#endif
> -struct cpufreq_governor cpufreq_gov_userspace = {
> +static struct cpufreq_governor cpufreq_gov_userspace = {
> .name = "userspace",
> .governor = cpufreq_governor_userspace,
> .store_setspeed = cpufreq_set,
> @@ -116,6 +113,11 @@ MODULE_DESCRIPTION("CPUfreq policy gover
> MODULE_LICENSE("GPL");
>
> #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE
> +struct cpufreq_governor *cpufreq_default_governor(void)
> +{
> + return &cpufreq_gov_userspace;
> +}
> +
> fs_initcall(cpufreq_gov_userspace_init);
> #else
> module_init(cpufreq_gov_userspace_init);
>
> --
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> More majordomo info at http://vger.kernel.org/majordomo-info.html
>
Ah, that's so much more cleaner!
Acked-by: Saravana Kannan <skannan@...eaurora.org>
--
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