linux-kernel - Re: [PATCH 4/4] arm64: gicv3: its: Increase FORCE_MAX

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Date:	Tue, 12 May 2015 13:30:57 +0100
From:	Will Deacon <will.deacon@....com>
To:	Robert Richter <robert.richter@...iumnetworks.com>
Cc:	Robert Richter <rric@...nel.org>,
	Marc Zyngier <Marc.Zyngier@....com>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Tirumalesh Chalamarla <tchalamarla@...ium.com>,
	Radha Mohan Chintakuntla <rchintakuntla@...ium.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 4/4] arm64: gicv3: its: Increase FORCE_MAX_ZONEORDER for
 Cavium ThunderX

On Mon, May 11, 2015 at 10:14:38AM +0100, Robert Richter wrote:
> On 05.05.15 11:53:29, Will Deacon wrote:
> > On Sun, May 03, 2015 at 09:49:32PM +0100, Robert Richter wrote:
> > > From: Radha Mohan Chintakuntla <rchintakuntla@...ium.com>
> > > 
> > > In case of ARCH_THUNDER, there is a need to allocate the GICv3 ITS table
> > > which is bigger than the allowed max order. So we are forcing it only in
> > > case of 4KB page size.
> > 
> > Does this problem disappear if the ITS driver uses dma_alloc_coherent
> > instead? That would also allow us to remove the __flush_dcache_area abuse
> > from the driver.
> 
> __get_free_pages() is also used internally in dma_alloc_coherent().
> 
> There is another case if the device brings dma mem with it. I am not
> sure if it would be possible to assign some phys memory via devicetree
> to the interrupt controller and then assign that range for its table
> allocation.
> 
> Another option would be to allocate a hugepage. This would require
> setting up hugepages during boottime. I need to figure out whether
> that could work.
> 
> What about on the remaining 3 patches?

Marc would be the best guy to review those, but he's on holiday for a couple
of weeks at the moment.

Will
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