[Bug 67187] New: Radeon HD6950: UVD not responding, trying to reset the VCPU

[Bug 67187] New: Radeon HD6950: UVD not responding, trying to reset the VCPU

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https://bugs.freedesktop.org/show_bug.cgi?id=67187

          Priority: medium
            Bug ID: 67187
          Assignee: dri-devel@lists.freedesktop.org
           Summary: Radeon HD6950: UVD not responding, trying to reset the
                    VCPU
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: h.judt@gmx.at
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Radeon
           Product: DRI

Created attachment 82837
  --> https://bugs.freedesktop.org/attachment.cgi?id=82837&action=edit
dmesg.out

When I thought suspend/resume was finally working, I found these error messages
in dmesg. See file attached, it's dmesg with multiple suspend/resume cycles.
Note I'm using tuxonice patches, but that shouldn't matter. If retesting with
vanilla is required, I can do this of course.

Note: I have the fix from bug #66425 applied.

Linux-3.10.1.

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[Bug 67187] Radeon HD6950: UVD not responding, trying to reset the VCPU

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https://bugs.freedesktop.org/show_bug.cgi?id=67187

Christian König <deathsimple@vodafone.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED

--- Comment #1 from Christian König <deathsimple@vodafone.de> ---
Well that's interesting.

According to your logs it worked the first three times, then it doesn't worked
twelve times and then the VCPU boots again but the IB test fails...

Did you tried playing any video in between?

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[Bug 67187] Radeon HD6950: UVD not responding, trying to reset the VCPU

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https://bugs.freedesktop.org/show_bug.cgi?id=67187

--- Comment #2 from Harald Judt <h.judt@gmx.at> ---
That is likely, but I'm not sure about the influence of this and will
investigate if there is any connection between using vdpau/uvd and
suspend/resume or not.

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[Bug 67187] Radeon HD6950: UVD not responding, trying to reset the VCPU

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--- Comment #3 from Harald Judt <h.judt@gmx.at> ---
Ok, good news first: It doesn't seem to have to do anything with playing videos
using UVD. In fact, playing videos works fine and doesn't have any bad effect
on suspending or hibernating.

But there are worse troubles now. The reason the error messages started to
appear was because I set /sys/power/pm_async to 1 - to make it faster -, albeit
for suspend/resume only. This explains why they appeared only for some cycles.
I've always set pm_async to 0 because of my hibernate/resume problems described
in bug #44772. Before the introduction of UVD support, suspend/resume worked
reliably with pm_async=1. Now that's not the case anymore and pm_async=0 has
become mandatory. But what's worse, even with pm_async set to 0, suspend/resume
doesn't work reliable anymore. Sometimes the monitor simply turns off when
suspending, and the system hangs. Previously, that was only the case with
hibernate/resume at resume time.

Now I wonder... Maybe the card simply takes more time to initialize? At least
the error message states UVD failed to initialize... Is there some way to add a
delay at resuming/initializing, maybe this would help?

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[Bug 67187] Radeon HD6950: UVD not responding, trying to reset the VCPU

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https://bugs.freedesktop.org/show_bug.cgi?id=67187

--- Comment #4 from Harald Judt <h.judt@gmx.at> ---
There is some inconsistency in my testing. As one can deduce from dmesg.out, I
was using tuxonice hybrid suspend/resume (behold the alternating S4/S3 lines)
and that might have a bad influence on in-kernel suspend. Tuxonice or in-kernel
hibernation might be broken, I have seen other issues. I will test this again
properly this or next week, using vanilla, to remove all uncertainties and try
to narrow it down a bit more.

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[Bug 67187] Radeon HD6950: UVD not responding, trying to reset the VCPU

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https://bugs.freedesktop.org/show_bug.cgi?id=67187

--- Comment #5 from Harald Judt <h.judt@gmx.at> ---
Created attachment 83279
  --> https://bugs.freedesktop.org/attachment.cgi?id=83279&action=edit
dmesg.out

Ok, I gave it a try with new vanilla 3.11-rc3. It ends with the following error
message, though I'm not sure it isn't simply a follow-up problem caused by
previous errors:

[ 2203.028013] [drm:r600_ring_test] *ERROR* radeon: ring 0 test failed
(scratch(0x8504)=0xCAFEDEAD)

As you can deduce from the dmesg.out file attached to the bug report, the first
few tries work ok. The problem seems to be more easily reproducible (but not
restricted to that) when pm_async is enabled. I'm not yet sure it happens with
pm_async off, but by experience, the chances that it does are very likely.

What is a bit strange is that the message "entering sleep state S4" never
appears in the dmesg.out. This _could_ be because I issued "echo reboot >
/sys/power/disk". However, this is about hibernate/resume, as you can see when
you look at the pm messages.

I believe the main problem occurs already at suspend time, because when it
happens, suspend always takes longer than usual, hanging a bit with the monitor
turned off. However, there are no error messages to be found in the log, only
when resuming. Perhaps I should use no_suspend_console and/or net_console.

Also note how the UVD initialization fails, then the machine continues booting
and later you can hibernate again, which will restore UVD but cause the ring 0
failure with CAFEDEAD. At first, the screen is blank, then shows an animated
nostalgic noise picture similar to analog tv that has no reception. The machine
is still responsive and one can ssh in.

Is there perhaps an option to enable for more debugging messages that could
give more insight?

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[Bug 67187] Radeon HD6950: UVD not responding, trying to reset the VCPU

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https://bugs.freedesktop.org/show_bug.cgi?id=67187

--- Comment #6 from Harald Judt <h.judt@gmx.at> ---
Note that the cayman: "suspending"/"suspend complete" and "resuming"/"resume
complete" functions are only simple printks I added to the begin and end of the
cayman_suspend/cayman_resume functions.

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--- Comment #7 from Harald Judt <h.judt@gmx.at> ---
Further tests show:

* the 0xCAFEDEAD seems to have been a one-time error that usually does not
occur
* in case of problems, "UVD not responding" does not always appear and is
successfully initialized, but the ring 5 error usually does
  radeon 0000:01:00.0: GPU lockup (waiting for 0x0000000000000008 last fence id
0x0000000000000006)
  [drm:r600_uvd_ib_test] *ERROR* radeon: fence wait failed (-35).
  [drm:radeon_ib_ring_tests] *ERROR* radeon: failed testing IB on ring 5 (-35).
* it does not always hang when suspending, yet resume might still fail
* enabling pm_async makes suspend/resume fail sometimes with "uvd not
responding", while the process appears to be quite stable with pm_async
deactivated (may only be harder to reproduce, still needs more testing)
* hibernate/resume will fail with pm_async deactivated sometimes, and pretty
reliably with pm_async enabled

Pretty weird...

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https://bugs.freedesktop.org/show_bug.cgi?id=67187

--- Comment #8 from Harald Judt <h.judt@gmx.at> ---
Finally! I've pulled
http://cgit.freedesktop.org/~agd5f/linux/log/?h=drm-fixes-3.11 for rc3 and
reliability of suspending and hibernating has improved *a lot*. The machine
will even hibernate and resume with successfully with pm_async=1 now. There was
only one time that a similar error message occurred in 1 out of 18 attempts,
this time only slightly different from the other errors:

[ 4379.361691] radeon 0000:01:00.0: GPU lockup CP stall for more than 10000msec
[ 4379.361692] radeon 0000:01:00.0: GPU lockup (waiting for 0x0000000000000026
last fence id 0x0000000000000024)
[ 4379.361693] [drm:r600_uvd_ib_test] *ERROR* radeon: fence wait failed (-35).
[ 4379.361695] [drm:radeon_ib_ring_tests] *ERROR* radeon: failed testing IB on
ring 5 (-35).

Let's see how more often this will occur. Apart from this one failure (I hope
it was only bad luck) it works very well now. Thanks for the improvements.

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--- Comment #9 from Harald Judt <h.judt@gmx.at> ---
Ok, it happened a second time with a similar message; this seems to occur
randomly and unpredictibly as always.

It is definitely a UVD-only issue. I've applied the radeon.no_uvd patch some
guy wrote from here: http://pastebin.com/0mRGb224. Now with uvd turned off, 32
out of 32 attempts have been successful. No more hibernate problems, but UVD
doesn't work of course.

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--- Comment #10 from Christian König <deathsimple@vodafone.de> ---
I'm constantly improving the UVD support for 3.11 (and back porting the fixes
to 3.10).

So please retest with each new release candidate as long a those symptoms
remain.

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Alex Deucher <agd5f@yahoo.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bastian.triller@gmail.com

--- Comment #11 from Alex Deucher <agd5f@yahoo.com> ---
*** Bug 67723 has been marked as a duplicate of this bug. ***

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--- Comment #12 from Harald Judt <h.judt@gmx.at> ---
I've run the tests again with the latest commits pulled from ~agd5f/linux, and
hibernate&suspend/resume seems to work fine now with uvd enabled! That's 12 out
of 12 successful attempts so far, so please let's leave this open for a while
until I have properly tested this in production for three or four days.

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--- Comment #13 from Bastian Triller <bastian.triller@gmail.com> ---
Resume from suspend only works when I have the power plug attached. It doesn't
matter, if I suspended on AC or not as long I have attached it on resume.

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--- Comment #14 from Bastian Triller <bastian.triller@gmail.com> ---
Created attachment 83867
  --> https://bugs.freedesktop.org/attachment.cgi?id=83867&action=edit
dmesg

there was an error on the first suspend:
...
[drm:rv770_stop_dpm] *ERROR* Could not force DPM to low.

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--- Comment #15 from Alex Deucher <agd5f@yahoo.com> ---
(In reply to comment #13)
> Resume from suspend only works when I have the power plug attached. It
> doesn't matter, if I suspended on AC or not as long I have attached it on
> resume.

Does resume work with dpm disabled?  This bug is specifically about UVD.  If
there is an issue with dpm and resume, it should be filed separately.

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--- Comment #16 from Harald Judt <h.judt@gmx.at> ---
Just as I wanted to write that everything works ok with uvd enabled and this
bug can be closed, after the 19th suspend/hibernate attempt the machine failed
to resume, with the screen simply going black and reporting no signal :-(

I've tried to resume from the same image 5 times but to no avail, so I'm back
now with radeon.no_uvd=1 for a while to give it a test with real-world usage
pattern. Just to be sure that this works in all cases too.

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--- Comment #17 from Harald Judt <h.judt@gmx.at> ---
Ok, status update. After 29 successful attempts and an uptime of approx 9.5
days with radeon.no_uvd=1 I am quite confident that the
suspend/hibernate/resume problems can be attributed to the UVD code. While I am
thankful for the new-gained stability, I will continue testing newer release
candidates with UVD enabled next time I have to reboot my machine for system
backup.

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Harald Judt <h.judt@gmx.at> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED

--- Comment #18 from Harald Judt <h.judt@gmx.at> ---
Another status update; I've reenabled UVD after updating to kernel 3.11.4 and
mesa git, and now hibernating and resuming worked without problems for 25
attempts. No more ring 5 test errors. Let's finally declare this fixed, many
thanks!

BTW: UVD works fine except sometimes there seems to be some kind of problem
with initializing; green or pink blocks or strange white/black-patterned lines
appear regardless of the video played, with videos that have been played
flawlessly before. This issue goes away after awhile. I will collect more
information and file a separate bug for this.

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Christian König <deathsimple@vodafone.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |CLOSED

--- Comment #19 from Christian König <deathsimple@vodafone.de> ---
Sounds good, please try the newest 3.12 rc first before opening another bug
report about the playback artifacts.

I've fixed a couple of different bugs in this release and I'm not sure they got
all backported yet.

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