linux-kernel - Re: [RFC][PATCH 1/3] PM: Introduce new top level suspend and hibernation callbacks (rev. 4)

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Message-Id: <200803271733.14480.rjw@sisk.pl>
Date:	Thu, 27 Mar 2008 17:33:13 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	benh@...nel.crashing.org
Cc:	Alexey Starikovskiy <astarikovskiy@...e.de>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Greg KH <greg@...ah.com>, Len Brown <lenb@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	David Brownell <david-b@...bell.net>,
	Pavel Machek <pavel@....cz>, Oliver Neukum <oliver@...kum.org>
Subject: Re: [RFC][PATCH 1/3] PM: Introduce new top level suspend and hibernation callbacks (rev. 4)

On Thursday, 27 of March 2008, Benjamin Herrenschmidt wrote:
> 
> On Thu, 2008-03-27 at 02:23 +0100, Rafael J. Wysocki wrote:
> > On Thursday, 27 of March 2008, Benjamin Herrenschmidt wrote:
> > > 
> > > > > There is absolutely no point getting a second struct anymore.
> > > > 
> > > > I obviously disagree with that opinion, so please elaborate.
> > > 
> > > Well, what does it bring you ? Why can't it be one struct ? To save
> > > space in the data area ?
> > 
> > Mostly, but not only that.
> > 
> > There are users of 'struct pm_ops' that aren't even supposed to define the
> > _noirq callbacks (device types and device classes), so I thought it would be
> > better to introduce a separate _noirq struct after all.
> 
> Make sense... USB has no use of noirq for example.

Well, FWIW, we can also do something like this:

struct pm_ops {
	int (*prepare)(struct device *dev);
	void (*complete)(struct device *dev);
	int (*suspend)(struct device *dev);
	int (*resume)(struct device *dev);
	int (*freeze)(struct device *dev);
	int (*thaw)(struct device *dev);
	int (*poweroff)(struct device *dev);
	int (*restore)(struct device *dev);
};

struct pm_ext_ops {
	struct pm_ops base;
	int (*suspend_noirq)(struct device *dev);
	int (*resume_noirq)(struct device *dev);
	int (*freeze_noirq)(struct device *dev);
	int (*thaw_noirq)(struct device *dev);
	int (*poweroff_noirq)(struct device *dev);
	int (*restore_noirq)(struct device *dev);
};

and use 'struct pm_ext_ops' for the entities that may need to implement the
_noirq callbacks.  This way we'll avoid the duplication of "_noirq" in the code
pointed to by Alex and there will be one "pm" pointer per bus type, device
type, device class, etc.

Thoughts?

Thanks,
Rafael
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