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

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Date:	Tue, 5 May 2015 11:53:29 +0100
From:	Will Deacon <will.deacon@....com>
To:	Robert Richter <rric@...nel.org>
Cc:	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>,
	Robert Richter <rrichter@...ium.com>
Subject: Re: [PATCH 4/4] arm64: gicv3: its: Increase FORCE_MAX_ZONEORDER for
 Cavium ThunderX

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.

Will
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