linux-kernel - Re: using DMA-API on ARM

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Date:	Mon, 8 Dec 2014 17:50:16 +0100
From:	Johannes Stezenbach <js@...21.net>
To:	Catalin Marinas <catalin.marinas@....com>
Cc:	Russell King <linux@....linux.org.uk>,
	"brcm80211-dev-list@...adcom.com" <brcm80211-dev-list@...adcom.com>,
	linux-wireless <linux-wireless@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Arend van Spriel <arend@...adcom.com>,
	David Miller <davem@...emloft.net>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: using DMA-API on ARM

On Mon, Dec 08, 2014 at 03:55:57PM +0000, Catalin Marinas wrote:
> On Mon, Dec 08, 2014 at 12:55:38PM +0000, Johannes Stezenbach wrote:
> > On Fri, Dec 05, 2014 at 06:53:03PM +0000, Catalin Marinas wrote:
> > > 
> > > BTW, if you really have a PL310-like L2 cache, have a look at some
> > > patches (I've seen similar symptoms) and make sure your configuration is
> > > correct:
> > > 
> > > http://www.arm.linux.org.uk/developer/patches/viewpatch.php?id=6395/1
> > > 
> > > http://www.arm.linux.org.uk/developer/patches/viewpatch.php?id=6529/1
> > > 
> > > The first one is vexpress specific. The second one was eventually
> > > discarded by Russell (I don't remember the reason, I guess it's because
> > > SoC code is supposed to set the right bits in there anyway). In your
> > > case, such bits may be set up by firmware, so Linux cannot fix anything
> > > up.
> > 
> > How do you avoid the unpredictable behavior mentioned in the
> > PL310 TRM when the Shared Attribute Invalidate Enable bit is set?
> > http://infocenter.arm.com/help/topic/com.arm.doc.ddi0246h/Ceggcfcj.html
> 
> So you talk about "Shared Attribute _Invalidate_ Enable" (bit 13) while
> I talk about "Shared Attribute _Override_ Enable" (bit 22).
> 
> In addition, Shared _Invalidate_ behaviour can only be enabled if Shared
> Attribute _Override_ Enable bit is not set.

Yeah, I got confused, sorry for the noise.

Thanks,
Johannes
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