On 7/22/20 7:45 AM, Limonciello, Mario wrote:
-----Original Message-----
From: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
Sent: Tuesday, July 21, 2020 6:07 PM
To: Limonciello, Mario; Joerg Roedel
Cc: baolu.lu@xxxxxxxxxxxxxxx; Ashok Raj; linux-kernel@xxxxxxxxxxxxxxx;
stable@xxxxxxxxxxxxxxx; Koba Ko; iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx
Subject: Re: [PATCH 1/1] iommu/vt-d: Skip TE disabling on quirky gfx dedicated
iommu
[EXTERNAL EMAIL]
Hi Limonciello,
On 7/21/20 10:44 PM, Limonciello, Mario wrote:
-----Original Message-----
From: iommu<iommu-bounces@xxxxxxxxxxxxxxxxxxxxxxxxxx> On Behalf Of Lu
Baolu
Sent: Monday, July 20, 2020 7:17 PM
To: Joerg Roedel
Cc: Ashok Raj;linux-kernel@xxxxxxxxxxxxxxx;stable@xxxxxxxxxxxxxxx; Koba
Ko;iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx
Subject: [PATCH 1/1] iommu/vt-d: Skip TE disabling on quirky gfx dedicated
iommu
The VT-d spec requires (10.4.4 Global Command Register, TE field) that:
Hardware implementations supporting DMA draining must drain any in-flight
DMA read/write requests queued within the Root-Complex before completing
the translation enable command and reflecting the status of the command
through the TES field in the Global Status register.
Unfortunately, some integrated graphic devices fail to do so after some
kind of power state transition. As the result, the system might stuck in
iommu_disable_translation(), waiting for the completion of TE transition.
This provides a quirk list for those devices and skips TE disabling if
the qurik hits.
Fixes:https://bugzilla.kernel.org/show_bug.cgi?id=208363
That one is for TGL.
I think you also want to add this one for ICL:
Fixes:https://bugzilla.kernel.org/show_bug.cgi?id=206571
Do you mean someone have tested that this patch also fixes the problem
described in 206571?
Yes, confusingly https://bugzilla.kernel.org/show_bug.cgi?id=208363#c31 actually
is the XPS 9300 ICL system and issue.
I also have a private confirmation from another person that it resolves it for
them on another ICL platform.
Okay! Thank you very much! I just posted v2 with this tag added.
Best regards,
baolu
