linux-kernel - Re: Driver: PCIe: 'pci_map_sg' returning invalid bus address?

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Date:	Sat, 14 Aug 2010 16:25:52 +0100
From:	Evan Lavelle <sa212+lkml@...onix.com>
To:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Driver: PCIe: 'pci_map_sg' returning invalid bus address?

Thanks guys. I had to get this working quickly so I just stuck with my 
bounce buffer code. I'm not sure that it's technically a 'bounce 
buffer'; it just so happens that 'pci_alloc_consistent' returns an 
address in the low 32 bits. This may stop working if the user installs 
more than 4Gig of memory but I can live with that for now. Performance 
isn't great (~110Mbytes/s on 4-channel PCIe) but it's good enough.

It's disappointing that LDD didn't have anything to say about this; it's 
pretty fundamental to DMA on x86_32 and PAE.

Thanks -

Evan
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