linux-kernel - Re: [RFC] Simple userspace interface for PCI drivers

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Date:	Fri, 1 Sep 2006 11:16:58 -0700
From:	Greg KH <gregkh@...e.de>
To:	Andi Kleen <ak@...e.de>
Cc:	Matt Porter <mporter@...eddedalley.com>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [RFC] Simple userspace interface for PCI drivers

On Thu, Aug 31, 2006 at 03:49:10PM +0200, Andi Kleen wrote:
> Matt Porter <mporter@...eddedalley.com> writes:
> > 
> > What about portable access to the PCI DMA API from userspace? 
> 
> We'll definitely need this for X11 anyways. Currently it is not
> possible to run the standard X server with a IOMMU that isolates
> the graphics card because it has no way to get at the GPU MMIO
> registers then.
> 
> My long-term plan was to integrate it in /sys/bus/pci mmaps
> (together with PAT etc.). When you mmap it there the kernel
> allocates a DMA mapping and then frees it on unmap.

That sounds very reasonable, looking forward to it.

thanks,

greg k-h
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