[Bug 95017] [drm:radeon_ib_ring_tests] *ERROR* radeon: failed testing IB on GFX ring (-35).

[Bug 95017] [drm:radeon_ib_ring_tests] *ERROR* radeon: failed testing IB on GFX ring (-35).

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Alex Deucher <alexdeucher@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|xorg-driver-ati@lists.x.org |dri-devel@lists.freedesktop
                   |                            |.org
         QA Contact|xorg-team@lists.x.org       |
            Version|6.9.0                       |unspecified
          Component|Driver/Radeon               |DRM/Radeon
            Product|xorg                        |DRI

--- Comment #2 from Alex Deucher <alexdeucher@gmail.com> ---
Does disabling AGP help?  Load the radeon module with agpmode=-1

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[Bug 95017] [drm:radeon_ib_ring_tests] *ERROR* radeon: failed testing IB on GFX ring (-35).

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--- Comment #3 from Mathieu Malaterre <mathieu.malaterre@gmail.com> ---
Indeed that solve the symptoms. I discover this was also documented here:

https://wiki.debian.org/PowerPC/FAQ#How_do_I_get_graphics_working.3F

[...]
image=/boot/vmlinux
        label=Linux
        read-only
        initrd=/boot/initrd.img
        append="radeon.agpmode=-1 modprobe.blacklist=ams"
[...]

I am not sure what the 'ams' thingy is doing, but I am using it over here.

The funny thing is that dragging window and moving them around makes the
pointer and the window out-of-sync. Still usable though after a while.

If AGP is simply not supported on PowerPC, it would be nice to have a clearer
message (or at least a warning).

Thanks

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--- Comment #4 from Michel Dänzer <michel@daenzer.net> ---
(In reply to Mathieu Malaterre from comment #3)
> If AGP is simply not supported on PowerPC, it would be nice to have a
> clearer message (or at least a warning).

It is supported, it's just unstable on many PowerMacs.

A patch disabling AGP by default on PowerMacs or even PPC in general probably
wouldn't be rejected. :)

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--- Comment #5 from Mathieu Malaterre <mathieu.malaterre@gmail.com> ---
Created attachment 123411
  --> https://bugs.freedesktop.org/attachment.cgi?id=123411&action=edit
default to PCI for PowerPC

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--- Comment #6 from Mathieu Malaterre <mathieu.malaterre@gmail.com> ---
(In reply to Michel Dänzer from comment #4)
> (In reply to Mathieu Malaterre from comment #3)
> > If AGP is simply not supported on PowerPC, it would be nice to have a
> > clearer message (or at least a warning).
> 
> It is supported, it's just unstable on many PowerMacs.
> 
> A patch disabling AGP by default on PowerMacs or even PPC in general
> probably wouldn't be rejected. :)

Something like the patch: defaulttopci_powerpc.patch ? Should I submit it first
on mesa-dev ?

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--- Comment #7 from Ilia Mirkin <imirkin@alum.mit.edu> ---
FWIW on nouveau we just default agpmode=0 in a #ifdef __powerpc__. Perhaps the
same thing can work for radeon.

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--- Comment #8 from Mathieu Malaterre <mathieu.malaterre@gmail.com> ---
(In reply to Ilia Mirkin from comment #7)
> FWIW on nouveau we just default agpmode=0 in a #ifdef __powerpc__. Perhaps
> the same thing can work for radeon.

Well radeon_agpmode is already set to 0 already[*]. My patch force to PCI(-1)
when user did not specify any value.

[*]https://github.com/torvalds/linux/blob/master/drivers/gpu/drm/radeon/radeon_drv.c#L173

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--- Comment #9 from Ilia Mirkin <imirkin@alum.mit.edu> ---
(In reply to Mathieu Malaterre from comment #8)
> (In reply to Ilia Mirkin from comment #7)
> > FWIW on nouveau we just default agpmode=0 in a #ifdef __powerpc__. Perhaps
> > the same thing can work for radeon.
> 
> Well radeon_agpmode is already set to 0 already[*]. My patch force to
> PCI(-1) when user did not specify any value.
> 
> [*]https://github.com/torvalds/linux/blob/master/drivers/gpu/drm/radeon/
> radeon_drv.c#L173

Oh, the logic is flipped from nouveau... on nouveau, -1 == autodetect and 0 ==
no agp. So in your case, just set it to -1 instead of 0 for powerpc. i.e.

#ifdef __powerpc__
int radeon_agpmode = -1;
#else
int radeon_agpmode = 0;
#endif

or something similar.

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--- Comment #10 from Rui Salvaterra <rsalvaterra@gmail.com> ---
(In reply to Michel Dänzer from comment #4)
> (In reply to Mathieu Malaterre from comment #3)
> > If AGP is simply not supported on PowerPC, it would be nice to have a
> > clearer message (or at least a warning).
> 
> It is supported, it's just unstable on many PowerMacs.
> 
> A patch disabling AGP by default on PowerMacs or even PPC in general
> probably wouldn't be rejected. :)

Hi, Michel


I don't understand. I know about the coherency issues on some UniNorth bridges
(DMA writes through the GART going directly to RAM, IIRC), but how did OS X
cope with them? Did it also disable AGP transfers? If not, what can be done to
fix this bug for real, instead of working around it? (I have a very vague
memory that these hangs didn't happen before KMS, but I may be completely
wrong.)
Also, on a somewhat related note, there are still issues with the Radeon (R600,
not SI) DRM on big endian, as for
https://bugs.freedesktop.org/show_bug.cgi?id=95015.


Thanks,

Rui

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--- Comment #11 from erhard_f@mailbox.org ---
Also been hit by this bug on 2 of my 3 machines: PowerMac 7,3 (A1047) w. Radeon
9600 Pro and PowerBook 5,6 (A1106).

My PowerBook 5,8 (A1138) magically works with AGP! Which is interesting because
both the 5,6 and the 5,8 use a Mobility Radeon 9700.

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--- Comment #12 from Mathieu Malaterre <mathieu.malaterre@gmail.com> ---
Patch has been submitted to mesa-dev:

https://lists.freedesktop.org/archives/mesa-dev/2016-May/115453.html

and Reviewed-By Christian König

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--- Comment #13 from Mathieu Malaterre <mathieu.malaterre@gmail.com> ---
Patch has also been submitted to dri-devel:

https://lists.freedesktop.org/archives/dri-devel/2016-May/107479.html

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--- Comment #14 from erhard_f@mailbox.org ---
It seems the patches to force Radeon cards into PCI-mode (or force it via
radeon.agpmode=-1) are no definitive solution. My G4 and G5 Macs hold out
longer running X but sooner or later a hard lock is unavoidable. Tested this on
a recent software stack: 4.8.1-kernel, xorg-server-1.18.4, xf86-video-ati-7.7.1
and mesa-12.0.3.

See my comment at Bug 94877.

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--- Comment #15 from erhard_f@mailbox.org ---
Played around a bit with xorg and kernel options on my G5 and worked out that I
can drive the Radeon 9650 at AGP x8 if I disable DRI completely via Option
"NoAccel" "true" in /etc/xorg.conf.

I had no GPU-lockups since then and xorg is much more responsive despite
lacking DRI hardware acceleration (radeon.agpmode=-1 with DRI enabled).

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--- Comment #16 from erhard_f@mailbox.org ---
linux-4.8.3-gentoo # dmesg | grep -i agp
[    0.000000] Found U3-AGP PCI host bridge.  Firmware bus number: 240->255
[   79.271669] Linux agpgart interface v0.103
[   79.286888] agpgart-uninorth 0000:f0:0b.0: Apple U3H chipset
[   79.300467] agpgart-uninorth 0000:f0:0b.0: configuring for size idx: 64
[   79.308235] agpgart-uninorth 0000:f0:0b.0: AGP aperture is 256M @ 0x0
[   82.883029] agpgart-uninorth 0000:f0:0b.0: putting AGP V3 device into 8x
mode
[   82.883040] radeon 0000:f0:10.0: putting AGP V3 device into 8x mode

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--- Comment #17 from Michel Dänzer <michel@daenzer.net> ---
(In reply to erhard_f from comment #15)
> Played around a bit with xorg and kernel options on my G5 and worked out
> that I can drive the Radeon 9650 at AGP x8 if I disable DRI completely via
> Option "NoAccel" "true" in /etc/xorg.conf.
> 
> I had no GPU-lockups since then

Sure, because you're not actually using the problematic AGP functionality. :)


> and xorg is much more responsive despite lacking DRI hardware acceleration
> (radeon.agpmode=-1 with DRI enabled).

FWIW, the value of the radeon.agpmode parameter shouldn't matter if you disable
DRI (which BTW means no GPU hardware acceleration can be used at all).

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--- Comment #18 from erhard_f@mailbox.org ---
> FWIW, the value of the radeon.agpmode parameter shouldn't matter if you disable
> DRI (which BTW means no GPU hardware acceleration can be used at all).

Yep. And I was astonished to see the desktop running faster actually. ;)

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--- Comment #19 from Simon <sur3@gmx.de> ---
*** Bug 95177 has been marked as a duplicate of this bug. ***

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Simon <sur3@gmx.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |sur3@gmx.de

--- Comment #20 from Simon <sur3@gmx.de> ---
Created attachment 142691
  --> https://bugs.freedesktop.org/attachment.cgi?id=142691&action=edit
dmesg

I think I have the same error with my Radeon HD 4670 on x64_64 arch with linux,
I attached my dmesg with the error in the end.

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Simon <sur3@gmx.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Hardware|PowerPC                     |All

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--- Comment #21 from Simon <sur3@gmx.de> ---
nothing seems to help, I tried agpmode=-1, disabling glamor that didnt help and
Option "NoAccel" "true" wont let me login on the grafical user interface at
all.

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

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

--- Comment #22 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/711.

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