linux-kernel - Re: [PATCH 1/1] pci: xgene: Enable huge outbound bar support

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Date:	Fri, 26 Jun 2015 22:43:32 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Duc Dang <dhdang@....com>
Cc:	linux-arm <linux-arm-kernel@...ts.infradead.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Pawel Moll <pawel.moll@....com>,
	Rob Herring <robh+dt@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Kumar Gala <galak@...eaurora.org>,
	Will Deacon <will.deacon@....com>,
	"David S. Miller" <davem@...emloft.net>,
	devicetree@...r.kernel.org, linux-pci@...r.kernel.org,
	patches <patches@....com>, linux-kernel@...r.kernel.org,
	Tanmay Inamdar <tinamdar@....com>
Subject: Re: [PATCH 1/1] pci: xgene: Enable huge outbound bar support

On Friday 26 June 2015 22:35:08 Arnd Bergmann wrote:
> > >
> > > Can you configure one of the two windows as prefetchable for improved performance?
> > >
> > The new huge window will be prefetchable.
> 
> The DT marks it as non-prefetchable, so the kernel will now try to allocate
> space for non-prefetchable BARs from this area, which is a bug. If the second
> memory window is always prefetchable, you have to mark it accordingly in DT,
> to prevent it from being used for normal 64 bit BARs.

Forget what I wrote here, I just remembered that 64-bit BARs are by definition
prefetchable. You should still mark the range accordingly in DT for correct
operation, but it won't be used for non-prefetchable 64-bit BARs if you don't
because they do not exist.

	Arnd
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