Re: linux-4.4 bisected: kwin5 stuck on kde5 loading screen with radeon

From	Mario Kleiner <mario.kleiner.de@gmail.com>
Newsgroups	linux.kernel
Subject	Re: linux-4.4 bisected: kwin5 stuck on kde5 loading screen with radeon
Date	2016-01-23 19:30 +0100
Message-ID	<qUb6G-6FS-5@gated-at.bofh.it> (permalink)
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On 01/22/2016 07:29 PM, Mario Kleiner wrote:
>
>
> On 01/22/2016 04:18 PM, Ville Syrjälä wrote:
>> On Fri, Jan 22, 2016 at 12:06:00PM +0900, Michel Dänzer wrote:
>>>
>>> [ Trimming KDE folks from Cc ]
>>>
>>> On 21.01.2016 19:09, Daniel Vetter wrote:
>>>> On Thu, Jan 21, 2016 at 05:36:46PM +0900, Michel Dänzer wrote:
>>>>> On 21.01.2016 16:58, Daniel Vetter wrote:
>>>>>>
>>>>>> Can you please point me at the vblank on/off jump bug please?
>>>>>
>>>>> AFAIR I originally reported it in response to
>>>>> http://lists.freedesktop.org/archives/dri-devel/2015-August/087841.html
>>>>>
>>>>> , but I can't find that in the archives, so maybe that was just on
>>>>> IRC.
>>>>> See
>>>>> http://lists.freedesktop.org/archives/dri-devel/2016-January/099122.html
>>>>>
>>>>> . Basically, I ran into the bug fixed by your patch because the
>>>>> counter
>>>>> jumped forward on every DPMS off, so it hit the 32-bit boundary after
>>>>> just a few days.
>>>>
>>>> Ok, so just uncovered the overflow bug.
>>>
>>> Not sure what you mean by "just", but to be clear: The drm_vblank_on/off
>>> counter jumping bug (similar to the bug this thread is about), which
>>> exposed the overflow bug, is still alive and kicking in 4.5. It seems
>>> to happen when turning off the CRTC:
>>>
>>> [drm:drm_update_vblank_count] updating vblank count on crtc 0:
>>> current=218104694, diff=0, hw=916 hw_last=916
>>> [drm:radeon_get_vblank_counter_kms] crtc 0: dist from vblank start 3
>>> [drm:drm_calc_vbltimestamp_from_scanoutpos] crtc 0 : v 0x7
>>> p(2199,-45)@ 7304.307354 -> 7304.308006 [e 0 us, 0 rep]
>>> [drm:radeon_get_vblank_counter_kms] crtc 0: dist from vblank start 3
>>> [drm:drm_update_vblank_count] updating vblank count on crtc 0:
>>> current=218104694, diff=16776301, hw=1 hw_last=916
>>
>> Not sure what bug we're talking about here, but here the hw counter
>> clearly jumps backwards.
>>
>>> [drm:radeon_get_vblank_counter_kms] Query failed! stat 3
>>> [drm:radeon_get_vblank_counter_kms] Query failed! stat 3
>>> [drm:drm_update_vblank_count] updating vblank count on crtc 1:
>>> current=0, diff=0, hw=0 hw_last=0
>>> [drm:radeon_get_vblank_counter_kms] Query failed! stat 3
>>> [drm:radeon_get_vblank_counter_kms] Query failed! stat 3
>>> [drm:drm_update_vblank_count] updating vblank count on crtc 2:
>>> current=0, diff=0, hw=0 hw_last=0
>>> [drm:radeon_get_vblank_counter_kms] Query failed! stat 3
>>> [drm:radeon_get_vblank_counter_kms] Query failed! stat 3
>>> [drm:drm_update_vblank_count] updating vblank count on crtc 3:
>>> current=0, diff=0, hw=0 hw_last=0
>>> [drm:radeon_get_vblank_counter_kms] Query failed! stat 1
>>> [drm:drm_calc_vbltimestamp_from_scanoutpos] crtc 0 : v 0x1 p(0,0)@
>>> 7304.317140 -> 7304.317140 [e 0 us, 0 rep]
>>> [drm:radeon_get_vblank_counter_kms] Query failed! stat 1
>>> [drm:drm_update_vblank_count] updating vblank count on crtc 0:
>>> current=234880995, diff=16777215, hw=0 hw_last=1
>>
>> Same here.
>>
>> These things just don't happen on i915 because drm_vblank_off() and
>> drm_vblank_on() are always called around the times when the hw counter
>> might get reset. Or at least that's how it should be.
>>
>
> Fwiw, testing the HD-57570 single display with my patch that uses
> drm_vblank_off/on() in the DPMS OFF/ON path of radeon-kms does show
> hardware counter reset to zero as expected, but no jumps of software
> vblank counter. So with that vblank_off/on placement it seems to work
> nicely here.
>
> -mario
>

I spoke too early. The jump doesn't happen when i change video modes - 
video resolution / refresh rate etc, despite hw counter reset. But if i 
just disable and then reenable a display, the software counter jumps.

-mario

Thread

linux-4.4 bisected: kwin5 stuck on kde5 loading screen with radeon Vlastimil Babka <vbabka@suse.cz> - 2016-01-15 11:40 +0100
  Re: linux-4.4 bisected: kwin5 stuck on kde5 loading screen with  radeon Ville Syrjälä <ville.syrjala@linux.intel.com> - 2016-01-15 13:30 +0100
    Re: linux-4.4 bisected: kwin5 stuck on kde5 loading screen with  radeon Vlastimil Babka <vbabka@suse.cz> - 2016-01-15 13:50 +0100
    Re: linux-4.4 bisected: kwin5 stuck on kde5 loading screen with  radeon Mario Kleiner <mario.kleiner.de@gmail.com> - 2016-01-16 05:30 +0100
      Re: linux-4.4 bisected: kwin5 stuck on kde5 loading screen with  radeon Vlastimil Babka <vbabka@suse.cz> - 2016-01-18 15:10 +0100
      Re: linux-4.4 bisected: kwin5 stuck on kde5 loading screen with  radeon Vlastimil Babka <vbabka@suse.cz> - 2016-01-20 21:30 +0100
      Re: linux-4.4 bisected: kwin5 stuck on kde5 loading screen with  radeon Mario Kleiner <mario.kleiner.de@gmail.com> - 2016-01-20 21:40 +0100
        Re: linux-4.4 bisected: kwin5 stuck on kde5 loading screen with  radeon Michel Dänzer <michel@daenzer.net> - 2016-01-21 04:50 +0100
          Re: linux-4.4 bisected: kwin5 stuck on kde5 loading screen with  radeon Mario Kleiner <mario.kleiner.de@gmail.com> - 2016-01-21 06:40 +0100
            Re: linux-4.4 bisected: kwin5 stuck on kde5 loading screen with  radeon Michel Dänzer <michel@daenzer.net> - 2016-01-21 07:40 +0100
              Re: linux-4.4 bisected: kwin5 stuck on kde5 loading screen with  radeon Michel Dänzer <michel@daenzer.net> - 2016-01-21 07:50 +0100
                Re: linux-4.4 bisected: kwin5 stuck on kde5 loading screen with  radeon Daniel Vetter <daniel@ffwll.ch> - 2016-01-21 09:00 +0100
                Re: linux-4.4 bisected: kwin5 stuck on kde5 loading screen with  radeon Michel Dänzer <michel@daenzer.net> - 2016-01-21 09:40 +0100
                Re: linux-4.4 bisected: kwin5 stuck on kde5 loading screen with  radeon Daniel Vetter <daniel@ffwll.ch> - 2016-01-21 11:10 +0100
                Re: linux-4.4 bisected: kwin5 stuck on kde5 loading screen with  radeon Michel Dänzer <michel@daenzer.net> - 2016-01-22 04:10 +0100
                Re: linux-4.4 bisected: kwin5 stuck on kde5 loading screen with  radeon Ville Syrjälä <ville.syrjala@linux.intel.com> - 2016-01-22 16:20 +0100
                Re: linux-4.4 bisected: kwin5 stuck on kde5 loading screen with  radeon Mario Kleiner <mario.kleiner.de@gmail.com> - 2016-01-22 19:30 +0100
                Re: linux-4.4 bisected: kwin5 stuck on kde5 loading screen with  radeon Mario Kleiner <mario.kleiner.de@gmail.com> - 2016-01-23 19:30 +0100
                Re: linux-4.4 bisected: kwin5 stuck on kde5 loading screen with  radeon Michel Dänzer <michel@daenzer.net> - 2016-01-25 05:20 +0100
                Re: linux-4.4 bisected: kwin5 stuck on kde5 loading screen with  radeon Mario Kleiner <mario.kleiner.de@gmail.com> - 2016-01-25 14:20 +0100
                Re: linux-4.4 bisected: kwin5 stuck on kde5 loading screen with  radeon Ville Syrjälä <ville.syrjala@linux.intel.com> - 2016-01-25 14:30 +0100
                Re: linux-4.4 bisected: kwin5 stuck on kde5 loading screen with  radeon Mario Kleiner <mario.kleiner.de@gmail.com> - 2016-01-25 14:50 +0100
                Re: linux-4.4 bisected: kwin5 stuck on kde5 loading screen with  radeon Ville Syrjälä <ville.syrjala@linux.intel.com> - 2016-01-25 16:00 +0100
                Re: linux-4.4 bisected: kwin5 stuck on kde5 loading screen with  radeon Mario Kleiner <mario.kleiner.de@gmail.com> - 2016-01-25 17:40 +0100
                Re: linux-4.4 bisected: kwin5 stuck on kde5 loading screen with  radeon Daniel Vetter <daniel@ffwll.ch> - 2016-01-25 20:00 +0100
                Re: linux-4.4 bisected: kwin5 stuck on kde5 loading screen with  radeon Mario Kleiner <mario.kleiner.de@gmail.com> - 2016-01-25 20:40 +0100
                Re: linux-4.4 bisected: kwin5 stuck on kde5 loading screen with  radeon Daniel Vetter <daniel@ffwll.ch> - 2016-01-25 21:40 +0100
                Re: linux-4.4 bisected: kwin5 stuck on kde5 loading screen with  radeon Mario Kleiner <mario.kleiner.de@gmail.com> - 2016-01-25 22:50 +0100
                Re: linux-4.4 bisected: kwin5 stuck on kde5 loading screen with radeon Daniel Vetter <daniel@ffwll.ch> - 2016-01-25 23:10 +0100
              Re: linux-4.4 bisected: kwin5 stuck on kde5 loading screen with  radeon Mario Kleiner <mario.kleiner.de@gmail.com> - 2016-01-21 09:30 +0100
                Re: linux-4.4 bisected: kwin5 stuck on kde5 loading screen with  radeon Vlastimil Babka <vbabka@suse.cz> - 2016-01-21 10:20 +0100

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