linux-kernel - Re: [PATCH v8 1/5] PM / Runtime: Add getter for querying the IRQ safe option

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20141031142241.GA17547@amd>
Date:	Fri, 31 Oct 2014 15:22:41 +0100
From:	Pavel Machek <pavel@....cz>
To:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <len.brown@...el.com>,
	Jonathan Corbet <corbet@....net>,
	Russell King <linux@....linux.org.uk>,
	Dan Williams <dan.j.williams@...el.com>,
	Vinod Koul <vinod.koul@...el.com>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Alan Stern <stern@...land.harvard.edu>,
	linux-pm@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, dmaengine@...r.kernel.org,
	Lars-Peter Clausen <lars@...afoo.de>,
	Michal Simek <michal.simek@...inx.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Subject: Re: [PATCH v8 1/5] PM / Runtime: Add getter for querying the IRQ
 safe option

On Fri 2014-10-31 10:14:55, Krzysztof Kozlowski wrote:
> On pon, 2014-10-20 at 11:04 +0200, Krzysztof Kozlowski wrote:
> > Add a simple getter pm_runtime_is_irq_safe() for querying whether runtime
> > PM IRQ safe was set or not.
> > 
> > Various bus drivers implementing runtime PM may use choose to suspend
> > differently based on IRQ safeness status of child driver (e.g. do not
> > unprepare the clock if IRQ safe is not set).
> > 
> > Signed-off-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
> > Reviewed-by: Ulf Hansson <ulf.hansson@...aro.org>
> 
> Rafael, Len, Pavel,
> 
> Is proposed API ok? Do you have any comments?
> 
> I'll upload whole patchset to Russell's patch tracking system. However
> an ack from PM maintainer is probably needed.

I don't like the API. Having callbacks work in different context (irq
/ noirq) based on what another function reports is ugly.

What is the penalty if we always decide callbacks are not IRQ safe?
								Pavel

> > --- a/Documentation/power/runtime_pm.txt
> > +++ b/Documentation/power/runtime_pm.txt
> > @@ -468,6 +468,10 @@ drivers/base/power/runtime.c and include/linux/pm_runtime.h:
> >      - set the power.irq_safe flag for the device, causing the runtime-PM
> >        callbacks to be invoked with interrupts off
> >  
> > +  bool pm_runtime_is_irq_safe(struct device *dev);
> > +    - return true if power.irq_safe flag was set for the device, causing
> > +      the runtime-PM callbacks to be invoked with interrupts off
> > +
> >    void pm_runtime_mark_last_busy(struct device *dev);
> >      - set the power.last_busy field to the current time
> >  
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/