linux-kernel - Re: [patch 5/8] [Intel IOMMU] Graphics driver workarounds to provide unity map

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Date:	Tue, 10 Apr 2007 02:07:02 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	hch@...radead.org
Cc:	ashok.raj@...el.com, linux-kernel@...r.kernel.org, akpm@...l.org,
	ak@...e.de, gregkh@...e.de, muli@...ibm.com,
	asit.k.mallick@...el.com, suresh.b.siddha@...el.com,
	anil.s.keshavamurthy@...el.com, arjan@...ux.intel.com,
	shaohua.li@...el.com
Subject: Re: [patch 5/8] [Intel IOMMU] Graphics driver workarounds to
 provide unity map

From: Christoph Hellwig <hch@...radead.org>
Date: Tue, 10 Apr 2007 09:33:51 +0100

> On Mon, Apr 09, 2007 at 02:55:57PM -0700, Ashok Raj wrote:
> > Most GFX drivers don't call standard PCI DMA APIs to allocate DMA buffer,
> > Such drivers will be broken with IOMMU enabled. To workaround this issue, 
> > we added two options.
> 
> All drm drivers do it.  If the usual out of tree crap vendors are too
> stupid for their own sake it's their fault.
> 
> So NACK to this patch.

That's my feeling as well, everything we care about should be using
the proper APIs or else what is the point of them...
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