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From: Evan Lavelle <sa212+lkml@cyconix.com>
To: LKML <linux-kernel@vger.kernel.org>
Subject: Re: Driver: PCIe: 'pci_map_sg' returning invalid bus address?
Date: Sat, 14 Aug 2010 16:25:52 +0100	[thread overview]
Message-ID: <4C66B580.5060606@cyconix.com> (raw)
In-Reply-To: <4C5002AD.6070206@cyconix.com>

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

  parent reply	other threads:[~2010-08-14 15:25 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-07-28 10:13 Driver: PCIe: 'pci_map_sg' returning invalid bus address? Evan Lavelle
2010-08-04  9:26 ` Evan Lavelle
2010-08-04 10:08   ` FUJITA Tomonori
2010-08-04 11:22     ` Evan Lavelle
2010-08-04 12:03       ` FUJITA Tomonori
2010-08-04 14:51         ` Konrad Rzeszutek Wilk
2010-08-13  1:35           ` Yuhong Bao
2010-08-14 15:25 ` Evan Lavelle [this message]
2010-08-16  3:31   ` Robert Hancock

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