Re: [linux-pm] driver power operations (was Re: suspend2 merge)

From: Johannes Berg
Date: Fri Apr 27 2007 - 11:27:59 EST

On Fri, 2007-04-27 at 17:20 +0200, Rafael J. Wysocki wrote:

> I think we can use 'stages' and pass them as arguments to the functions.
> In that case we can have two callbacks for the hibernation (I'd prefer to say
> 'hibernation' instead of 'suspend to disk' from now on), one 'quiesce' callback
> and one 'activate' callback that can be called many times in one
> snapshot/restore cycle with different arguments, for example:

But you're not proposing to add suspend/resume to this interface too, I
hope :)

> quiesce(PREPARE) -- that may be needed for drivers that allocate much memory
> before quiescing devices (if any)
> ...
> quiesce(PRE_SNAPSHOT)
> ...
> ...
> ...
> activate(POST_SNAPSHOT)
> ...
> activate(FINISH)

I'm still not sure I like having to switch on the argument for every
implementation. Is it really worth it?


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