linux-kernel - Re: [Nouveau] [PATCH v2 2/3] drm/ttm: introduce dma cache sync helpers

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Message-ID: <20140626161055.GX32514@n2100.arm.linux.org.uk>
Date:	Thu, 26 Jun 2014 17:10:55 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Alexandre Courbot <gnurou@...il.com>
Cc:	Stéphane Marchesin 
	<stephane.marchesin@...il.com>,
	Lucas Stach <l.stach@...gutronix.de>,
	Maarten Lankhorst <maarten.lankhorst@...onical.com>,
	"nouveau@...ts.freedesktop.org" <nouveau@...ts.freedesktop.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	Ben Skeggs <bskeggs@...hat.com>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [Nouveau] [PATCH v2 2/3] drm/ttm: introduce dma cache sync
	helpers

On Thu, Jun 26, 2014 at 11:53:20PM +0900, Alexandre Courbot wrote:
> We don't plan to rely on CMA for too long. IOMMU support is on the way
> and should make our life easier, although no matter the source of
> memory, we will still have the issue of the lowmem mappings.

When it comes to DMA memory, talking about lowmem vs highmem is utterly
meaningless.

The lowmem/highmem split is entirely a software concept and is completely
adjustable.  An extreme example is that you can boot any platform with
more than 32MB of memory with 32MB of lowmem and the remainder as
highmem.

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