[Bug 102543] [BAT][HSW] igt@tools_test@tools_test - Unclaimed read from register 0x[4c]400c

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=102543

--- Comment #7 from Chris Wilson  ---
(In reply to Martin Peres from comment #6)
> Thanks Chris! I will close this bug.
> 
> What about https://bugs.freedesktop.org/show_bug.cgi?id=102249 though? Could
> the patch you sent fix this too?

It's not intended to have any effect for any test except for tools_test; but
drv_suspend/forcewake, pm_rpm/debugfs-forcewake-user, gem_exec_latency,
gem_exec_parse, gem_workarounds and pm_lsps also poke around with registers
under forcewake - any may end up polluting the mmio debugger. #102249 looks
clear of outside influence.

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[Bug 102543] [BAT][HSW] igt@tools_test@tools_test - Unclaimed read from register 0x[4c]400c

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=102543

Martin Peres  changed:

   What|Removed |Added

 Status|NEW |RESOLVED
 Resolution|--- |FIXED

--- Comment #6 from Martin Peres  ---
Thanks Chris! I will close this bug.

What about https://bugs.freedesktop.org/show_bug.cgi?id=102249 though? Could
the patch you sent fix this too?

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[Bug 102543] [BAT][HSW] igt@tools_test@tools_test - Unclaimed read from register 0x[4c]400c

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=102543

Martin Peres  changed:

   What|Removed |Added

 Status|RESOLVED|CLOSED

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[Bug 102543] [BAT][HSW] igt@tools_test@tools_test - Unclaimed read from register 0x[4c]400c

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=102543

--- Comment #5 from Chris Wilson  ---
commit d7a133d886b45651e36e7065998b1413d379ac1f
Author: Chris Wilson 
Date:   Thu Sep 7 14:44:41 2017 +0100

drm/i915: Disable mmio debugging during user access

If the user bypasses i915 and accesses mmio directly, that easily
confuses our automatic mmio debugging (any error we then detect is
likely to be as a result of the user). Since we expect userspace to open
debugfs/i915_forcewake_user if i915.ko is loaded and they want mmio
access, that makes the opportune time to disable our debugging for
duration of the bypass.

v2: Move the fiddling of uncore internals to uncore.c

The issue in intel_reg_dump is still there, just not triggering a kernel
warning.

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[Bug 102543] [BAT][HSW] igt@tools_test@tools_test - Unclaimed read from register 0x[4c]400c

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=102543

--- Comment #4 from Chris Wilson  ---
E.g. https://patchwork.freedesktop.org/series/29935/

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[Bug 102543] [BAT][HSW] igt@tools_test@tools_test - Unclaimed read from register 0x[4c]400c

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=102543

--- Comment #3 from Chris Wilson  ---
>From our pov, no. The highlighted commit was just the merge to 4.13. But the
failure does depend upon i915 doing something during the test, but the test
itself bypasses i915 for direct hw access.

What we could do is to disable automatic mmio checking if user forcewake is
taken. Then clear any errors upon release.

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[Bug 102543] [BAT][HSW] igt@tools_test@tools_test - Unclaimed read from register 0x[4c]400c

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=102543

--- Comment #2 from Martin Peres  ---
The test has been passing recently. Has anything changed?

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[Bug 102543] [BAT][HSW] igt@tools_test@tools_test - Unclaimed read from register 0x[4c]400c

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=102543

Chris Wilson  changed:

   What|Removed |Added

  Component|DRM/Intel   |IGT
   Assignee|intel-gfx-bugs@lists.freede |dri-devel@lists.freedesktop
   |sktop.org   |.org
 QA Contact|intel-gfx-bugs@lists.freede |
   |sktop.org   |

--- Comment #1 from Chris Wilson  ---
That looks entirely to be a test bug, intel_reg_read reading unknown registers
which is then caught by the kernel on its next mmio. Since the kernel is not
aware of a third party messing around with registers, it takes the blame upon
itself.

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