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Date: Mon, 3 Aug 2015 10:12:49 +0200
From: Joerg Roedel <joro@8bytes.org>
To: Andreas Hartmann <andihartmann@freenet.de>
Cc: Mikulas Patocka <mpatocka@redhat.com>,
	iommu@lists.linux-foundation.org, Leo Duran <leo.duran@amd.com>,
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	Milan Broz <mbroz@redhat.com>, Jens Axboe <axboe@fb.com>,
	linux-pci <linux-pci@vger.kernel.org>
Subject: Re: [dm-devel] AMD-Vi IO_PAGE_FAULTs and ata3.00: failed command:
 READ FPDMA QUEUED errors since Linux 4.0
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On Sun, Aug 02, 2015 at 08:48:06PM +0200, Andreas Hartmann wrote:
> >>https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=34b48db66e08ca1c1bc07cf305d672ac940268dc
> >>
> >>block: remove artifical max_hw_sectors cap

Looking at the patch, it seems to me that it just uncovered a bug
elsewhere. It looks like an underlying driver doesn't expect the
big io-requests that the patch enables and does not dma-map the whole
target buffer, causing the IO_PAGE_FAULTs later.


	Joerg