linux-kernel - Re: [PATCH v2 01/30] pm: Improve EXPORT_*_DEV_PM

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Message-ID: <20220813154902.32f86ee2@jic23-huawei>
Date:   Sat, 13 Aug 2022 15:49:02 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     Lee Jones <lee.jones@...aro.org>, linux-kernel@...r.kernel.org,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        linux-pm <linux-pm@...r.kernel.org>
Subject: Re: [PATCH v2 01/30] pm: Improve EXPORT_*_DEV_PM_OPS macros

On Mon,  8 Aug 2022 19:40:38 +0200
Paul Cercueil <paul@...pouillou.net> wrote:

> Update the _EXPORT_DEV_PM_OPS() internal macro. It was not used anywhere
> outside pm.h and pm_runtime.h, so it is safe to update it.
> 
> Before, this macro would take a few parameters to be used as sleep and
> runtime callbacks. This made it unsuitable to use with different
> callbacks, for instance the "noirq" ones.
> 
> It is now semantically different: instead of creating a conditionally
> exported dev_pm_ops structure, it only contains part of the definition.
> 
> This macro should however never be used directly (hence the trailing
> underscore). Instead, the following four macros are provided:
> - EXPORT_DEV_PM_OPS(name)
> - EXPORT_GPL_DEV_PM_OPS(name)
> - EXPORT_NS_DEV_PM_OPS(name, ns)
> - EXPORT_NS_GPL_DEV_PM_OPS(name, ns)
> 
> For instance, it is now possible to conditionally export noirq
> suspend/resume PM functions like this:
> 
> EXPORT_GPL_DEV_PM_OPS(foo_pm_ops) = {
>     NOIRQ_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn)
> };
> 
> The existing helper macros EXPORT_*_SIMPLE_DEV_PM_OPS() and
> EXPORT_*_RUNTIME_DEV_PM_OPS() have been updated to use these new macros.
> 
> Signed-off-by: Paul Cercueil <paul@...pouillou.net>
Looks good to me and much nicer than me making the situation worse
as I did in the proposal to have a macro that took even more callbacks
as it's parameters.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>

> ---
> Cc: Jonathan Cameron <jic23@...nel.org>
> Cc: Rafael J. Wysocki <rafael@...nel.org>
> Cc: linux-pm <linux-pm@...r.kernel.org>
> 
>  include/linux/pm.h         | 37 +++++++++++++++++++++++--------------
>  include/linux/pm_runtime.h | 20 ++++++++++++--------
>  2 files changed, 35 insertions(+), 22 deletions(-)
> 
> diff --git a/include/linux/pm.h b/include/linux/pm.h
> index 871c9c49ec9d..93cd34f00822 100644
> --- a/include/linux/pm.h
> +++ b/include/linux/pm.h
> @@ -375,19 +375,20 @@ const struct dev_pm_ops name = { \
>  }
>  
>  #ifdef CONFIG_PM
> -#define _EXPORT_DEV_PM_OPS(name, suspend_fn, resume_fn, runtime_suspend_fn, \
> -			   runtime_resume_fn, idle_fn, sec, ns)		\
> -	_DEFINE_DEV_PM_OPS(name, suspend_fn, resume_fn, runtime_suspend_fn, \
> -			   runtime_resume_fn, idle_fn); \
> -	__EXPORT_SYMBOL(name, sec, ns)
> +#define _EXPORT_DEV_PM_OPS(name, sec, ns)				\
> +	const struct dev_pm_ops name;					\
> +	__EXPORT_SYMBOL(name, sec, ns);					\
> +	const struct dev_pm_ops name
>  #else
> -#define _EXPORT_DEV_PM_OPS(name, suspend_fn, resume_fn, runtime_suspend_fn, \
> -			   runtime_resume_fn, idle_fn, sec, ns) \
> -static __maybe_unused _DEFINE_DEV_PM_OPS(__static_##name, suspend_fn, \
> -					 resume_fn, runtime_suspend_fn, \
> -					 runtime_resume_fn, idle_fn)
> +#define _EXPORT_DEV_PM_OPS(name, sec, ns)				\
> +	static __maybe_unused const struct dev_pm_ops __static_##name
>  #endif
>  
> +#define EXPORT_DEV_PM_OPS(name) _EXPORT_DEV_PM_OPS(name, "", "")
> +#define EXPORT_GPL_DEV_PM_OPS(name) _EXPORT_DEV_PM_OPS(name, "_gpl", "")
> +#define EXPORT_NS_DEV_PM_OPS(name, ns) _EXPORT_DEV_PM_OPS(name, "", #ns)
> +#define EXPORT_NS_GPL_DEV_PM_OPS(name, ns) _EXPORT_DEV_PM_OPS(name, "_gpl", #ns)
> +
>  /*
>   * Use this if you want to use the same suspend and resume callbacks for suspend
>   * to RAM and hibernation.
> @@ -399,13 +400,21 @@ static __maybe_unused _DEFINE_DEV_PM_OPS(__static_##name, suspend_fn, \
>  	_DEFINE_DEV_PM_OPS(name, suspend_fn, resume_fn, NULL, NULL, NULL)
>  
>  #define EXPORT_SIMPLE_DEV_PM_OPS(name, suspend_fn, resume_fn) \
> -	_EXPORT_DEV_PM_OPS(name, suspend_fn, resume_fn, NULL, NULL, NULL, "", "")
> +	EXPORT_DEV_PM_OPS(name) = { \
> +		SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) \
> +	}
>  #define EXPORT_GPL_SIMPLE_DEV_PM_OPS(name, suspend_fn, resume_fn) \
> -	_EXPORT_DEV_PM_OPS(name, suspend_fn, resume_fn, NULL, NULL, NULL, "_gpl", "")
> +	EXPORT_GPL_DEV_PM_OPS(name) = { \
> +		SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) \
> +	}
>  #define EXPORT_NS_SIMPLE_DEV_PM_OPS(name, suspend_fn, resume_fn, ns)	\
> -	_EXPORT_DEV_PM_OPS(name, suspend_fn, resume_fn, NULL, NULL, NULL, "", #ns)
> +	EXPORT_NS_DEV_PM_OPS(name, ns) = { \
> +		SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) \
> +	}
>  #define EXPORT_NS_GPL_SIMPLE_DEV_PM_OPS(name, suspend_fn, resume_fn, ns)	\
> -	_EXPORT_DEV_PM_OPS(name, suspend_fn, resume_fn, NULL, NULL, NULL, "_gpl", #ns)
> +	EXPORT_NS_GPL_DEV_PM_OPS(name, ns) = { \
> +		SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) \
> +	}
>  
>  /* Deprecated. Use DEFINE_SIMPLE_DEV_PM_OPS() instead. */
>  #define SIMPLE_DEV_PM_OPS(name, suspend_fn, resume_fn) \
> diff --git a/include/linux/pm_runtime.h b/include/linux/pm_runtime.h
> index 9e4d056967c6..ba2077d9e366 100644
> --- a/include/linux/pm_runtime.h
> +++ b/include/linux/pm_runtime.h
> @@ -40,17 +40,21 @@
>  			   resume_fn, idle_fn)
>  
>  #define EXPORT_RUNTIME_DEV_PM_OPS(name, suspend_fn, resume_fn, idle_fn) \
> -	_EXPORT_DEV_PM_OPS(name, pm_runtime_force_suspend, pm_runtime_force_resume, \
> -			   suspend_fn, resume_fn, idle_fn, "", "")
> +	EXPORT_DEV_PM_OPS(name) = { \
> +		RUNTIME_PM_OPS(suspend_fn, resume_fn, idle_fn) \
> +	}
>  #define EXPORT_GPL_RUNTIME_DEV_PM_OPS(name, suspend_fn, resume_fn, idle_fn) \
> -	_EXPORT_DEV_PM_OPS(name, pm_runtime_force_suspend, pm_runtime_force_resume, \
> -			   suspend_fn, resume_fn, idle_fn, "_gpl", "")
> +	EXPORT_GPL_DEV_PM_OPS(name) = { \
> +		RUNTIME_PM_OPS(suspend_fn, resume_fn, idle_fn) \
> +	}
>  #define EXPORT_NS_RUNTIME_DEV_PM_OPS(name, suspend_fn, resume_fn, idle_fn, ns) \
> -	_EXPORT_DEV_PM_OPS(name, pm_runtime_force_suspend, pm_runtime_force_resume, \
> -			   suspend_fn, resume_fn, idle_fn, "", #ns)
> +	EXPORT_NS_DEV_PM_OPS(name, ns) = { \
> +		RUNTIME_PM_OPS(suspend_fn, resume_fn, idle_fn) \
> +	}
>  #define EXPORT_NS_GPL_RUNTIME_DEV_PM_OPS(name, suspend_fn, resume_fn, idle_fn, ns) \
> -	_EXPORT_DEV_PM_OPS(name, pm_runtime_force_suspend, pm_runtime_force_resume, \
> -			   suspend_fn, resume_fn, idle_fn, "_gpl", #ns)
> +	EXPORT_NS_GPL_DEV_PM_OPS(name, ns) = { \
> +		RUNTIME_PM_OPS(suspend_fn, resume_fn, idle_fn) \
> +	}
>  
>  #ifdef CONFIG_PM
>  extern struct workqueue_struct *pm_wq;