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

[Nath, Arindam]

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