linux-kernel - Re: [PATCH v2 01/47] kernel: Add support for poweroff handler call chain

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Date:	Tue, 21 Oct 2014 11:34:05 +0200
From:	Johan Hovold <johan@...nel.org>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
	Alan Cox <gnomes@...rguk.ukuu.org.uk>,
	Alexander Graf <agraf@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Heiko Stuebner <heiko@...ech.de>,
	Lee Jones <lee.jones@...aro.org>,
	Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
	Philippe Rétornaz 
	<philippe.retornaz@...il.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Romain Perier <romain.perier@...il.com>
Subject: Re: [PATCH v2 01/47] kernel: Add support for poweroff handler call
 chain

On Mon, Oct 20, 2014 at 09:12:17PM -0700, Guenter Roeck wrote:

> v2:
> - poweroff -> power_off

Do you want to stick to power[-_ ]off consistently throughout?

> - Add defines for default priorities
> - Use raw notifiers protected by spinlocks instead of atomic notifiers
> - Add register_poweroff_handler_simple
> - Add devm_register_power_off_handler
> 
>  include/linux/pm.h              |  22 ++++
>  kernel/power/Makefile           |   1 +
>  kernel/power/poweroff_handler.c | 252 ++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 275 insertions(+)
>  create mode 100644 kernel/power/poweroff_handler.c
> 
> diff --git a/include/linux/pm.h b/include/linux/pm.h
> index 383fd68..7e0cb36 100644
> --- a/include/linux/pm.h
> +++ b/include/linux/pm.h
> @@ -34,7 +34,29 @@
>  extern void (*pm_power_off)(void);
>  extern void (*pm_power_off_prepare)(void);
>  
> +/*
> + * Callbacks to manage poweroff handlers

power-off

> + */
> +
> +struct notifier_block;
>  struct device; /* we have a circular dep with device.h */
> +
> +int register_power_off_handler(struct notifier_block *);
> +int devm_register_power_off_handler(struct device *, struct notifier_block *);
> +int register_power_off_handler_simple(void (*function)(void), int priority);
> +int unregister_power_off_handler(struct notifier_block *);
> +void do_kernel_power_off(void);
> +bool have_kernel_power_off(void);
> +
> +/*
> + * Pre-defined poweroff handler priorities

power-off

> + */
> +#define POWEROFF_PRIORITY_FALLBACK	0
> +#define POWEROFF_PRIORITY_LOW		64
> +#define POWEROFF_PRIORITY_DEFAULT	128
> +#define POWEROFF_PRIORITY_HIGH		192
> +#define POWEROFF_PRIORITY_HIGHEST	255

I think at least these ones should match the interface function and have
a POWER_OFF_PRIORITY_ prefix.

> +
>  #ifdef CONFIG_VT_CONSOLE_SLEEP
>  extern void pm_vt_switch_required(struct device *dev, bool required);
>  extern void pm_vt_switch_unregister(struct device *dev);
> diff --git a/kernel/power/Makefile b/kernel/power/Makefile
> index 29472bf..4d9f0c7 100644
> --- a/kernel/power/Makefile
> +++ b/kernel/power/Makefile
> @@ -2,6 +2,7 @@
>  ccflags-$(CONFIG_PM_DEBUG)	:= -DDEBUG
>  
>  obj-y				+= qos.o
> +obj-y				+= poweroff_handler.o
>  obj-$(CONFIG_PM)		+= main.o
>  obj-$(CONFIG_VT_CONSOLE_SLEEP)	+= console.o
>  obj-$(CONFIG_FREEZER)		+= process.o
> diff --git a/kernel/power/poweroff_handler.c b/kernel/power/poweroff_handler.c
> new file mode 100644
> index 0000000..aeb4736
> --- /dev/null
> +++ b/kernel/power/poweroff_handler.c

power_off_handler.c?

> @@ -0,0 +1,252 @@
> +/*
> + * linux/kernel/power/poweroff_handler.c - Poweroff handling functions
> + *
> + * Copyright (c) 2014 Guenter Roeck
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public Licence
> + * as published by the Free Software Foundation; either version
> + * 2 of the Licence, or (at your option) any later version.
> + */
> +
> +#define pr_fmt(fmt)	"poweroff: " fmt

power-off:?

There's a bunch of these introduced by the driver patches as well (e.g.
poweroff_nb).

Johan
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