iommu/amd: flush IOTLB for specific domains only (v2)

[Joseph Salisbury]

On 05/15/2018 04:03 AM, Nath, Arindam wrote:
> Adding Tom.
>
> Hi Joe,
>
> My original patch was never accepted. Tom and Joerg worked on another patch series which was supposed to fix the issue in question in addition to do some code cleanups. I believe their patches are already in the mainline. If I remember correctly, one of the patches disabled PCI ATS for the graphics card which was causing the issue.
>
> Do you still see the issue with latest mainline kernel?
>
> BR,
> Arindam
>
> -----Original Message-----
> From: Joseph Salisbury [mailto:joseph.salisbury at canonical.com] 
> Sent: Tuesday, May 15, 2018 1:17 AM
> To: Nath, Arindam <Arindam.Nath at amd.com>
> Cc: iommu at lists.linux-foundation.org; Bridgman, John <John.Bridgman at amd.com>; joro at 8bytes.org; amd-gfx at lists.freedesktop.org; drake at endlessm.com; stein12c at gmail.com; Suthikulpanit, Suravee <Suravee.Suthikulpanit at amd.com>; Deucher, Alexander <Alexander.Deucher at amd.com>; Kuehling, Felix <Felix.Kuehling at amd.com>; linux at endlessm.com; michel at daenzer.net; 1747463 at bugs.launchpad.net
> Subject: iommu/amd: flush IOTLB for specific domains only (v2)
>
> Hello Arindam,
>
> There is a bug report[0] that you created a patch[1] for a while back. However, the patch never landed in mainline.  There is a bug reporter in Ubuntu[2] that is affected by this bug and is willing to test the patch.  I attempted to build a test kernel with the patch, but it does not apply to currently mainline cleanly.  Do you still think this patch may resolve this bug?  If so, is there a version of your patch available that will apply to current mainline?
>
> Thanks,
>
> Joe
>
> [0] https://bugs.freedesktop.org/show_bug.cgi?id=101029
> [1] https://patchwork.freedesktop.org/patch/157327/
> [2] http://pad.lv/1747463
>
Hi Arindam,

Thanks for the feedback.  Yes, the latest mainline kernel was tested,
and it is reported the bug still happens in the Ubuntu kernel bug[0]. 
Is there any specific diagnostic info we can collect that might help?

Thanks,

Joe

[0] http://pad.lv/1747463