From: Jason Andryuk <jandryuk@gmail.com>
To: intel-gfx@lists.freedesktop.org,
xen-devel <xen-devel@lists.xenproject.org>
Subject: i915 dma faults on Xen
Date: Wed, 14 Oct 2020 15:28:46 -0400 [thread overview]
Message-ID: <CAKf6xpv-LRCuo-qHHWMuukYtvJiR-i+-YhLUOZeqoAFd-=swEQ@mail.gmail.com> (raw)
Hi,
Bug opened at https://gitlab.freedesktop.org/drm/intel/-/issues/2576
I'm seeing DMA faults for the i915 graphics hardware on a Dell
Latitude 5500. These were captured when I plugged into a Dell
Thunderbolt dock with two DisplayPort monitors attached. Xen 4.12.4
staging and Linux 5.4.70 (and some earlier versions).
Oct 14 18:41:49.056490 kernel:[ 85.570347] [drm:gen8_de_irq_handler
[i915]] *ERROR* Fault errors on pipe A: 0x00000080
Oct 14 18:41:49.056494 kernel:[ 85.570395] [drm:gen8_de_irq_handler
[i915]] *ERROR* Fault errors on pipe A: 0x00000080
Oct 14 18:41:49.056589 VM hypervisor: (XEN) [VT-D]DMAR:[DMA Read]
Request device [0000:00:02.0] fault addr 39b5845000, iommu reg =
ffff82c00021d000
Oct 14 18:41:49.056594 VM hypervisor: (XEN) [VT-D]DMAR: reason 06 -
PTE Read access is not set
Oct 14 18:41:49.056784 kernel:[ 85.570668] [drm:gen8_de_irq_handler
[i915]] *ERROR* Fault errors on pipe A: 0x00000080
Oct 14 18:41:49.056789 kernel:[ 85.570687] [drm:gen8_de_irq_handler
[i915]] *ERROR* Fault errors on pipe A: 0x00000080
Oct 14 18:41:49.056885 VM hypervisor: (XEN) [VT-D]DMAR:[DMA Read]
Request device [0000:00:02.0] fault addr 4238d0a000, iommu reg =
ffff82c00021d000
Oct 14 18:41:49.056890 VM hypervisor: (XEN) [VT-D]DMAR: reason 06 -
PTE Read access is not set
They repeat. In the log attached to
https://gitlab.freedesktop.org/drm/intel/-/issues/2576, they start at
"Oct 14 18:41:49.056589" and continue until I unplug the dock around
"Oct 14 18:41:54.801802".
I've also seen similar messages when attaching the laptop's HDMI port
to a 4k monitor. The eDP display by itself seems okay.
I tried Fedora 31 & 32 live images with intel_iommu=on, so no Xen, and
didn't see any errors
This is a kernel & xen log with drm.debug=0x1e. It also includes some
application (glass) logging when it changes resolutions which seems to
set off the DMA faults. 5500-igfx-messages-kern-xen-glass
Running xen with iommu=no-igfx disables the iommu for the i915
graphics and no faults are reported. However, that breaks some other
devices (Dell Latitude 7200 and 5580) giving a black screen with:
Oct 10 13:24:37.022117 kernel:[ 14.884759] i915 0000:00:02.0: Failed
to idle engines, declaring wedged!
Oct 10 13:24:37.022118 kernel:[ 14.964794] i915 0000:00:02.0: Failed
to initialize GPU, declaring it wedged!
Any suggestions welcome.
Thanks,
Jason
next reply other threads:[~2020-10-14 19:29 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-14 19:28 Jason Andryuk [this message]
2020-10-14 19:37 ` i915 dma faults on Xen Andrew Cooper
2020-10-15 11:31 ` Roger Pau Monné
2020-10-15 15:16 ` Jason Andryuk
2020-10-15 16:38 ` Tamas K Lengyel
2020-10-15 17:13 ` Jason Andryuk
2021-02-19 17:33 ` tboot UEFI and Xen (was Re: i915 dma faults on Xen) Jason Andryuk
2020-10-16 16:23 ` i915 dma faults on Xen Jason Andryuk
2020-10-21 9:58 ` Roger Pau Monné
2020-10-21 10:33 ` Jan Beulich
2020-10-21 10:51 ` Roger Pau Monné
2020-10-21 12:45 ` Jason Andryuk
2020-10-21 12:52 ` Jan Beulich
2020-10-21 13:36 ` Jason Andryuk
2020-10-21 13:59 ` Jan Beulich
2021-02-19 17:30 ` Jason Andryuk
2021-02-22 10:18 ` Roger Pau Monné
2021-02-22 12:49 ` Jason Andryuk
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to='CAKf6xpv-LRCuo-qHHWMuukYtvJiR-i+-YhLUOZeqoAFd-=swEQ@mail.gmail.com' \
--to=jandryuk@gmail.com \
--cc=intel-gfx@lists.freedesktop.org \
--cc=xen-devel@lists.xenproject.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).