linux-kernel - Re: Error: DMA: Out of SW-IOMMU space [was: External USB drives become unresponsive after few hours.]

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Date:	Fri, 17 Apr 2015 17:14:20 +0200
From:	Dorian Gray <yourfavouritegod@...il.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc:	Alexander Duyck <alexander.duyck@...il.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Suman Tripathi <stripathi@....com>,
	iommu@...ts.linux-foundation.org,
	USB list <linux-usb@...r.kernel.org>,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: Error: DMA: Out of SW-IOMMU space [was: External USB drives
 become unresponsive after few hours.]

On 16 April 2015 at 20:42, Konrad Rzeszutek Wilk <konrad.wilk@...cle.com> wrote:
> And easier way is to compile the kernel with CONFIG_DMA_API_DEBUG
> and then load the attached module.
>
> That should tell you who and what else is holding on the buffers.

Ok, I have compiled 3.19.4 w/ CONFIG_DMA_API_DEBUG=y + the module you sent me.
Now, I'm not sure if I've done it right - I waited until the error
occured and then modprobe'd dump_dma.
I have attached the kernel log, but it tells me not much, if anything...

Thanks again.
Jake

Download attachment "dump_dma.log.tar.bz2" of type "application/x-bzip2" (72777 bytes)