[Bug 98322] QXL drm driver regression in 4.7

[Bug 98322] QXL drm driver regression in 4.7

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https://bugs.freedesktop.org/show_bug.cgi?id=98322

            Bug ID: 98322
           Summary: QXL drm driver regression in 4.7
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/other
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: tiwai@suse.de

Since 4.7 kernel, qxl drm driver spews the errors when using VT:

 kernel: [TTM] Buffer eviction failed
 kernel: qxl 0000:00:02.0: object_init failed for (4026540032, 0x00000001)
 kernel: [drm:qxl_alloc_bo_reserved [qxl]] *ERROR* failed to allocate VRAM BO

In my test case, just install a QEMU/KVM VM with QXL interface, login GUI, and
then switch to VT1.  At login there, the error appears repeatedly.

4.6 kernel works fine.

The git bisection spotted that it was introduced by
6819c3c2517604f979da3de773f2420e07dd4f4b
    drm/qxl: Use drm_fb_helper deferred_io support

This was originally reported for opensuse TW:
  https://bugzilla.suse.com/show_bug.cgi?id=1003298

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[Bug 98322] QXL drm driver regression in 4.7

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https://bugs.freedesktop.org/show_bug.cgi?id=98322

--- Comment #1 from Takashi Iwai <tiwai@suse.de> ---
OK, I found out the culprit.  It's the race of dirty update callback and the
dirty clip update.  The schedule_work() in drm_fb_helper_dirty() must be inside
the spinlock.  Otherwise the concurrent calls may conflict, one clears the clip
while the another is called after that with the cleared clip area.

I'll post the patch soon later.

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[Bug 98322] QXL drm driver regression in 4.7

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https://bugs.freedesktop.org/show_bug.cgi?id=98322

--- Comment #2 from David C. Rankin <drankinatty@suddenlinkmail.com> ---
I can confirm this bug remains in the 4.8 kernel as well. KVM with Archlinux
guest (virt-manager defaults, except for window scaling) results in the
following message displayed between every command:

[TTM] Byffer eviction failed
qxl 0000:00:02:0: object_init failed for (402650032, 0x00000001)
[drm:qxl_alloc_bo_reserved [qxl1] *ERROR* failed to allocate VRAM BO

Arch kernel package: linux-4.8.2-1-x86_64.pkg.tar.xz

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[Bug 98322] QXL drm driver regression in 4.7

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https://bugs.freedesktop.org/show_bug.cgi?id=98322

Martin Peres <martin.peres@free.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |INVALID

--- Comment #3 from Martin Peres <martin.peres@free.fr> ---
Hi,

Freedesktop's Bugzilla instance is EOLed and open bugs are about to be migrated
to http://gitlab.freedesktop.org.

To avoid migrating out of date bugs, I am now closing all the bugs that did not
see any activity in the past year. If the issue is still happening, please
create a new bug in the relevant project at https://gitlab.freedesktop.org/drm
(use misc by default).

Sorry about the noise!

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