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https://bugs.launchpad.net/ubuntu/+source/linux/+bug/247148

SRU justification:

Impact: Using SWIOMMU unnecessarily causes "out of space" errors and
subsequently causes corruptions in software RAID (and probably also caused the
problems mentioned in
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/238118/comments/9).


Fix: (taken from the Xen changelog) This patch adds a new check,
check_pages_physically_contiguous(), to the test for pages stradding page
boundaries both in swiotlb_map_sg() and dma_map_sg(), to capture these ranges
and map them directly via virt_to_bus() mapping rather than through the swiotlb.


Testcase: IO errors when doing increased workload on SCSI drives (see bug report)

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Stefan Bader wrote:
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/247148
>
> SRU justification:
>
> Impact: Using SWIOMMU unnecessarily causes "out of space" errors and
> subsequently causes corruptions in software RAID (and probably also
> caused the problems mentioned in
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/238118/comments/9).
>
> Fix: (taken from the Xen changelog) This patch adds a new check,
> check_pages_physically_contiguous(), to the test for pages stradding
> page boundaries both in swiotlb_map_sg() and dma_map_sg(), to capture
> these ranges and map them directly via virt_to_bus() mapping rather than
> through the swiotlb.
>
> Testcase: IO errors when doing increased workload on SCSI drives (see
> bug report)
>

ACK - the test results look good.

rtg
--
Tim Gardner tim.gardner@canonical.com

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