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Date: Mon, 10 May 2010 11:50:56 +0900 From: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp> To: stern@...land.harvard.edu Cc: daniel@...aq.de, clemens@...isch.de, tiwai@...e.de, alsa-devel@...a-project.org, gregkh@...e.de, konrad.wilk@...cle.com, linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org, chrisw@...s-sol.org, iommu@...ts.linux-foundation.org, andi@...stfloor.org, pedrib@...il.com, akpm@...ux-foundation.org, dwmw2@...radead.org Subject: Re: [alsa-devel] USB transfer_buffer allocations on 64bit systems On Fri, 7 May 2010 10:51:10 -0400 (EDT) Alan Stern <stern@...land.harvard.edu> wrote: > On Fri, 7 May 2010, Daniel Mack wrote: > > > > At least the audio class and ua101 drivers don't do this and fill the > > > buffers before they are submitted. > > > > Gnaa, you're right. I _thought_ my code does it the way I described, but > > what I wrote is how I _wanted_ to do it, not how it's currently done. I > > have a plan to change this in the future. > > > > So unfortunately, that doesn't explain it either. Sorry for the noise. > > At one point we tried an experiment, printing out the buffer and DMA > addresses. I don't recall seeing anything obviously wrong, but if an > IOMMU was in use then that might not mean anything. Is it possible > that the IOMMU mappings sometimes get messed up for addresses above 4 > GB? You mean that an IOMMU could allocate an address above 4GB wrongly? If so, IIRC, all the IOMMU implementations use dev->dma_mask and dev->coherent_dma_mask properly. And the DMA address space of the majority of IOMMUs are limited less than 4GB. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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