[Bug 82889] New: [drm:si_dpm_set_power_state] *ERROR* si_disable_ulv failed

[Bug 82889] New: [drm:si_dpm_set_power_state] *ERROR* si_disable_ulv failed

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=82889

          Priority: medium
            Bug ID: 82889
          Assignee: dri-devel@lists.freedesktop.org
           Summary: [drm:si_dpm_set_power_state] *ERROR* si_disable_ulv
                    failed
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: mmstickman@gmail.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: git
         Component: Drivers/Gallium/radeonsi
           Product: Mesa

Yet another bug I've encountered on my Radeon HD 7950 with kernel 3.16.

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[Bug 82889] [drm:si_dpm_set_power_state] *ERROR* si_disable_ulv failed

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https://bugs.freedesktop.org/show_bug.cgi?id=82889

Michel Dänzer <michel@daenzer.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Product|Mesa                        |DRI
            Version|git                         |unspecified
          Component|Drivers/Gallium/radeonsi    |DRM/Radeon

--- Comment #1 from Michel Dänzer <michel@daenzer.net> ---
Please attach the dmesg output.

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[Bug 82889] [drm:si_dpm_set_power_state] *ERROR* si_disable_ulv failed

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https://bugs.freedesktop.org/show_bug.cgi?id=82889

--- Comment #2 from mmstickman@gmail.com ---
Created attachment 105003
  --> https://bugs.freedesktop.org/attachment.cgi?id=105003&action=edit
dmesg

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[Bug 82889] [drm:si_dpm_set_power_state] *ERROR* si_disable_ulv failed

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https://bugs.freedesktop.org/show_bug.cgi?id=82889

--- Comment #3 from Alex Deucher <agd5f@yahoo.com> ---
Is this a regression?  If so, can you bisect?

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[Bug 82889] [drm:si_dpm_set_power_state] *ERROR* si_disable_ulv failed

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https://bugs.freedesktop.org/show_bug.cgi?id=82889

--- Comment #4 from mmstickman@gmail.com ---
I'm not sure if it is a regression or simply a new feature that doesn't work. I
don't recall seeing the message in kernel 3.14 or prior. I don't have any
experience in bisecting.

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[Bug 82889] [drm:si_dpm_set_power_state] *ERROR* si_disable_ulv failed

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https://bugs.freedesktop.org/show_bug.cgi?id=82889

--- Comment #5 from Samir Ibradžić <sibradzic@gmail.com> ---
Created attachment 105455
  --> https://bugs.freedesktop.org/attachment.cgi?id=105455&action=edit
Radeon dpm hang

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[Bug 82889] [drm:si_dpm_set_power_state] *ERROR* si_disable_ulv failed

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https://bugs.freedesktop.org/show_bug.cgi?id=82889

--- Comment #6 from Samir Ibradžić <sibradzic@gmail.com> ---
Created attachment 105456
  --> https://bugs.freedesktop.org/attachment.cgi?id=105456&action=edit
Radeon dpm success

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[Bug 82889] [drm:si_dpm_set_power_state] *ERROR* si_disable_ulv failed

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https://bugs.freedesktop.org/show_bug.cgi?id=82889

--- Comment #7 from Samir Ibradžić <sibradzic@gmail.com> ---
I see this happening on Radeon HD 7950, kernel 3.13, which has the radeon dpm
enabled by dafault. It is intermittent, happens on ~30% boots, and causes hang
followed by reboot (no panic or oops msgs). Unfortunately, I could only catch
the dmesg output via serial, when my machine hangs, kernel logs are not even
saved to the disk.

Now, I see "[drm:si_dpm_set_power_state] *ERROR* si_disable_ulv failed" on
serial only when ignore_loglevel kernel parameter is unset. Machine will hang
ad reboot each time I spot it.
I attached here the dmesg with ignore_loglevel and drm.debug=1 params, both
failure and ok cases, for comparison. When failing, the machine just hangs
breefly, and reboots, right after "[drm]    pitch is 7680" message.

With radeon.dpm=0 parameter, this problem NEVER happns!

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[Bug 82889] [drm:si_dpm_set_power_state] *ERROR* si_disable_ulv failed

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https://bugs.freedesktop.org/show_bug.cgi?id=82889

--- Comment #8 from lorenz.bona@gmail.com ---
Same warning here with 3.17rc5. Building from this repository

http://cgit.freedesktop.org/~agd5f/linux/log/?h=drm-fixes-3.17

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[Bug 82889] [drm:si_dpm_set_power_state] *ERROR* si_disable_ulv failed

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https://bugs.freedesktop.org/show_bug.cgi?id=82889

--- Comment #9 from lorenz.bona@gmail.com ---
Created attachment 106873
  --> https://bugs.freedesktop.org/attachment.cgi?id=106873&action=edit
dmesg | grep drm

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[Bug 82889] [drm:si_dpm_set_power_state] *ERROR* si_disable_ulv failed

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https://bugs.freedesktop.org/show_bug.cgi?id=82889

--- Comment #10 from Alexandre Demers <alexandre.f.demers@gmail.com> ---
Just moved from a 6950 (r600g) to a 7950 (radeonsi) and hit the same error on
kernel 3.17-rc6.

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--- Comment #11 from Alexandre Demers <alexandre.f.demers@gmail.com> ---
Is ULV standing for Ultra-low voltage? If so, isn't this option something meant
to be applied on APU only?

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https://bugs.freedesktop.org/show_bug.cgi?id=82889

--- Comment #12 from Alexandre Demers <alexandre.f.demers@gmail.com> ---
Created attachment 106884
  --> https://bugs.freedesktop.org/attachment.cgi?id=106884&action=edit
journalctl log

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https://bugs.freedesktop.org/show_bug.cgi?id=82889

--- Comment #13 from Alexandre Demers <alexandre.f.demers@gmail.com> ---
I commented out every "return ret;" of si_dpm_set_power_state() in si_dpm.c.
After booting this modified kernel, I can confirm this is the only error
reported in si_dpm_set_power_state(): every other verification passes OK and it
goes down to the very end.

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[Bug 82889] [drm:si_dpm_set_power_state] *ERROR* si_disable_ulv failed

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https://bugs.freedesktop.org/show_bug.cgi?id=82889

--- Comment #14 from Lorenzo Bona <lorenz.bona@gmail.com> ---
(In reply to comment #11)
> Is ULV standing for Ultra-low voltage? If so, isn't this option something
> meant to be applied on APU only?

Mmm don't know. 
Haven't digged more, but my GPU (R7-265) is running hotter than before, always
around 39°-40° (even without any running application).
With the kernel in debian sid, 3.16.X, I can see low temperatures in idle.

I'm unable to trigger this warning booting up with radeon.dpm=0, so I think is
something related to power management.

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[Bug 82889] [drm:si_dpm_set_power_state] *ERROR* si_disable_ulv failed

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https://bugs.freedesktop.org/show_bug.cgi?id=82889

--- Comment #15 from Alexandre Demers <alexandre.f.demers@gmail.com> ---
(In reply to comment #14)
> (In reply to comment #11)
> > Is ULV standing for Ultra-low voltage? If so, isn't this option something
> > meant to be applied on APU only?
> 
> Mmm don't know. 
> Haven't digged more, but my GPU (R7-265) is running hotter than before,
> always around 39°-40° (even without any running application).
> With the kernel in debian sid, 3.16.X, I can see low temperatures in idle.
> 
> I'm unable to trigger this warning booting up with radeon.dpm=0, so I think
> is something related to power management.

Well, according to my journalctl log, it seems to always be triggered after a
power state switching. It doesn't do it from boot (power state 0) to
performance (power state 1), but it is later. Strangely, I see a 
Sep 25 20:28:28 Xander kernel: switching from power state:
Sep 25 20:28:28 Xander kernel:         ui class: performance
...
Sep 25 20:28:28 Xander kernel: switching to power state:
Sep 25 20:28:28 Xander kernel:         ui class: performance

Why would it try to switch from power state 1 to power state 1 (the same power
state)? And why is it at that moment the problem arises? I'll have to do more
tests to see if this behaviour happens each time.

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https://bugs.freedesktop.org/show_bug.cgi?id=82889

--- Comment #16 from Alexandre Demers <alexandre.f.demers@gmail.com> ---
Alex, I think this "ERROR" should be at most a warning: I've been commenting
out the "return ret" when we hit the error, and everything else goes as smooth
as possible.

Also, do you have any clue on the way we should dig to understand why we are
hitting this error? As said by Samir, this appeared with dpm.

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https://bugs.freedesktop.org/show_bug.cgi?id=82889

--- Comment #17 from Alex Deucher <agd5f@yahoo.com> ---
Created attachment 107784
  --> https://bugs.freedesktop.org/attachment.cgi?id=107784&action=edit
disable ulv state on SI

(In reply to Alexandre Demers from comment #16)
> Alex, I think this "ERROR" should be at most a warning: I've been commenting
> out the "return ret" when we hit the error, and everything else goes as
> smooth as possible.
> 
> Also, do you have any clue on the way we should dig to understand why we are
> hitting this error? As said by Samir, this appeared with dpm.

It's part of dpm so it only happens when dpm is enabled.  ulv is a special low
power state the card can go to in certain idle cases.

Does the attached patch help?

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[Bug 82889] [drm:si_dpm_set_power_state] *ERROR* si_disable_ulv failed

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https://bugs.freedesktop.org/show_bug.cgi?id=82889

--- Comment #18 from Alexandre Demers <alexandre.f.demers@gmail.com> ---
(In reply to Alex Deucher from comment #17)
> Created attachment 107784 [details] [review]
> disable ulv state on SI
> 
> (In reply to Alexandre Demers from comment #16)
> > Alex, I think this "ERROR" should be at most a warning: I've been commenting
> > out the "return ret" when we hit the error, and everything else goes as
> > smooth as possible.
> > 
> > Also, do you have any clue on the way we should dig to understand why we are
> > hitting this error? As said by Samir, this appeared with dpm.
> 
> It's part of dpm so it only happens when dpm is enabled.  ulv is a special
> low power state the card can go to in certain idle cases.
> 
> Does the attached patch help?

I changed yet again my card and I'm now running a R9 280X. I'll put the old
card in tomorrow to have a look at it.

So ulv is a feature available on both APUs and 7950 (and some other GPUs). Nice
to know.

But is ulv support truly supposed to be available on Tahiti? In fact, prior to
your patch, why is there already a comment "/* XXX disable for A0 tahiti */" in
drivers/gpu/drm/radeon/si_dpm.c but ulv.supported is set to true anyway just on
the next line (the one you propose to change in your patch)? To me, it's like
saying a thing and doing exactly the opposite at the same time, isn't it? Or is
it because there is a special case (Tahiti) that we should be addressing
identified by the comment that we are not?

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--- Comment #19 from Alex Deucher <agd5f@yahoo.com> ---
(In reply to Alexandre Demers from comment #18)
> 
> But is ulv support truly supposed to be available on Tahiti? In fact, prior
> to your patch, why is there already a comment "/* XXX disable for A0 tahiti
> */" in drivers/gpu/drm/radeon/si_dpm.c but ulv.supported is set to true
> anyway just on the next line (the one you propose to change in your patch)?
> To me, it's like saying a thing and doing exactly the opposite at the same
> time, isn't it? Or is it because there is a special case (Tahiti) that we
> should be addressing identified by the comment that we are not?

A0 is first silicon (basically the initial silicon samples we get back from the
fab during bring up).  The issue was fixed in later silicon revisions.  There
usually aren't any A0 boards in the wild.

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--- Comment #20 from Alexandre Demers <alexandre.f.demers@gmail.com> ---
Sadly, I won't be able to test this patch, I had an opportunity to sell my hd
7950. We can keep it open if someone else can test it.

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--- Comment #21 from Lorenzo Bona <lorenz.bona@gmail.com> ---
I've rebuilded today the whole stack (mesa, ddx, drm, xorg, and kernel) with
latest commit. 

Looks like the problem is now solved. Dmesg attached.

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--- Comment #22 from Lorenzo Bona <lorenz.bona@gmail.com> ---
Created attachment 108125
  --> https://bugs.freedesktop.org/attachment.cgi?id=108125&action=edit
dmesg | grep drm

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--- Comment #23 from sean darcy <seandarcy2@gmail.com> ---
I've a kaveri a8-7100. After this patch, is there a way to reenable ulv without
rebuilding drm?

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--- Comment #24 from Alex Deucher <agd5f@yahoo.com> ---
(In reply to sean darcy from comment #23)
> I've a kaveri a8-7100. After this patch, is there a way to reenable ulv
> without rebuilding drm?

This patch and bug have nothing to do with Kaveri.  It's specifically related
Southern Islands GPUs.

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[Bug 82889] [drm:si_dpm_set_power_state] *ERROR* si_disable_ulv failed

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=82889

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

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

--- Comment #25 from Martin Peres <martin.peres@free.fr> ---
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been
closed from further activity.

You can subscribe and participate further through the new bug through this link
to our GitLab instance: https://gitlab.freedesktop.org/drm/amd/issues/518.

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