Hi Marek & Alex,
I've found the issue why forcefully evicting page tables sometimes
crashes the box.
Well this is a typical hexdump page table before it is moved to GART:
000117f000 02914061 00000000
000117f008 02915061 00000000
000117f010 02916061 00000000
000117f018 02917061 00000000
000117f020 02918061 00000000
And it looks like this when it comes back:
0006102000 00000000 00000000
*
Ideas? I don't really have an explanation for this. Moving buffers
around otherwise seems to work perfectly fine.
Thanks,
Christian.
Am 28.05.2014 12:38, schrieb Christian König:
I already tried a similar patch as well, without any more noticeable
crashes. But going to give this another round with your patch and
openarena.
Thanks,
Christian.
Am 27.05.2014 23:55, schrieb Marek Olšák:
Hi Christian,
I test on Bonaire (ChipID = 0x665c). Unfortunately, the hangs are not
fixed yet. They are very rare and very random. Therefore, I have come
up with a patch which evicts page tables between IBs. See the
attachment. With that patch applied, the system starts fine, compiz
and glxgears work, but once I start playing openarena, it locks up
pretty quickly.
The patch shouldn't do anything in theory, because pages are moved
back to VRAM immediately after that. However, the VRAM address of page
tables may end up being different from before, which might be the root
cause.
Marek
On Wed, May 14, 2014 at 2:11 PM, Christian König
<deathsimple@xxxxxxxxxxx> wrote:
Crap, any chance you can narrow it down a bit more?
I've just tried a piglit quick test on my Bonaire and it seems to work
perfectly fine.
What hw do you test on?
Regards,
Christian.
Am 13.05.2014 23:21, schrieb Marek Olšák:
Hi Christian,
Even though some regressions are fixed by these patches:
drm/radeon: fix page directory update size estimation
drm/radeon: fix buffer placement under memory pressure v2
and indeed, the texelFetch tests no longer hang, there is one more
hang which needs to be fixed. :( All I know is the exact same commit
causes it and it can only be reproduced by running whole piglit with
concurrency enabled.
My kernel git log:
* 2ba22c8 - drm/radeon: fix buffer placement under memory pressure v2
(10 hours ago) <Christian König>
* 3af91e5 - drm/radeon: fix page directory update size estimation (21
hours ago) <Christian König>
* 6d2f294 - drm/radeon: use normal BOs for the page tables v4 (2
months ago) <Christian König>
* fa68834 - drm/radeon: further cleanup vm flushing & fencing (2
months ago) <Christian König>
fa68834 doesn't hang, but 2ba22c8 hangs, which means 6d2f294 or either
of the two fixes is the first bad commit.
Marek
On Fri, May 9, 2014 at 8:03 PM, Marek Olšák <maraeo@xxxxxxxxx> wrote:
Hi Christian,
This commit which first appeared in 3.15-rc1 causes hangs on Bonaire:
commit 6d2f2944e95e504a7d33385eeeb9bb7fcca72592
Author: Christian König <christian.koenig@xxxxxxx>
Date: Thu Feb 20 13:42:17 2014 +0100
drm/radeon: use normal BOs for the page tables v4
No need to make it more complicated than necessary,
just allocate the page tables as normal BO and
flush whenever the address change.
v2: update comments and function name
v3: squash bug fixes, page directory and tables patch
v4: rebased on Mareks changes
Signed-off-by: Christian König <christian.koenig@xxxxxxx>
Reverting the commit gives me a lot of merge conflicts.
The simplest way to reproduce the hangs is to run piglit with these
parameters:
-t texelFetch.fs
Some of the tests allocate a lot of MSAA textures and the tests also
run in parallel, which creates a lot of memory pressure and probably
causes buffer evictions.
Any idea what is wrong with it?
Thanks,
Marek
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