From: Joerg Roedel <jroedel@suse.de>
To: Bjorn Helgaas <helgaas@kernel.org>
Cc: Bjorn Helgaas <bhelgaas@google.com>,
linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
Daniel Drake <drake@endlessm.com>,
Alexander Deucher <Alexander.Deucher@amd.com>,
Samuel Sieb <samuel@sieb.net>,
David Woodhouse <dwmw2@infradead.org>
Subject: Re: [PATCH v2] PCI: Add ATS-disable quirk for AMD Stoney GPUs
Date: Fri, 16 Jun 2017 18:29:23 +0200 [thread overview]
Message-ID: <20170616162923.GE25710@suse.de> (raw)
In-Reply-To: <20170615191545.GB12735@bhelgaas-glaptop.roam.corp.google.com>
Hi Bjorn,
On Thu, Jun 15, 2017 at 02:15:45PM -0500, Bjorn Helgaas wrote:
> It was marked "superseded" in patchwork and thus off my radar. I
> don't remember if I did that or why. I changed it back to "New" so I
> won't forget about it.
Great!
> You mention (May 24) the original bug report. Can you include the URL
> for that?
I think there were multiple reports, here is one I could still find:
https://lists.linuxfoundation.org/pipermail/iommu/2017-March/020836.html
> I admit I just don't have warm fuzzies that the problem is well
> understood.
The current understanding (without my ability to debug the hardware
involved) is that the GPU in the Stoney systems gets into a weird state
when ATS invalidations are sent too fast and stops responding to the
iommu.
The iommu then can't complete the invalidation commands and the driver
throws completion-wait loop timeout messages out.
Joerg
next prev parent reply other threads:[~2017-06-16 16:29 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-07 14:32 [PATCH v2] PCI: Add ATS-disable quirk for AMD Stoney GPUs Joerg Roedel
2017-04-07 16:46 ` Deucher, Alexander
2017-05-04 10:21 ` David Woodhouse
2017-05-04 14:41 ` Deucher, Alexander
2017-05-23 19:54 ` Deucher, Alexander
2017-05-24 8:44 ` Joerg Roedel
2017-05-24 10:38 ` David Woodhouse
2017-05-24 12:56 ` Deucher, Alexander
2017-05-26 6:48 ` Samuel Sieb
2017-05-26 11:57 ` Deucher, Alexander
2017-05-26 12:54 ` David Woodhouse
2017-05-26 15:59 ` Deucher, Alexander
2017-04-08 7:41 ` Lukas Wunner
2017-04-20 12:11 ` Joerg Roedel
2017-06-15 17:12 ` Bjorn Helgaas
2017-06-15 14:04 ` Joerg Roedel
2017-06-15 17:01 ` Samuel Sieb
2017-06-15 18:13 ` Deucher, Alexander
2017-06-15 19:15 ` Bjorn Helgaas
2017-06-16 16:29 ` Joerg Roedel [this message]
2017-07-10 16:53 ` Bjorn Helgaas
2017-07-11 11:49 ` Joerg Roedel
2017-07-11 19:08 ` Deucher, Alexander
2017-07-13 2:56 ` Bjorn Helgaas
2017-08-29 20:02 ` Samuel Sieb
2017-08-29 20:49 ` Bjorn Helgaas
2017-08-30 11:44 ` Joerg Roedel
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