Hi Marek,
There is a workaround in 3.15 which disables sDMA and uses CP DMA for
copying buffers. It seems to help Christian's machine, but not mine.
With stressing the box with piglit I was able to bring my machine down
with the CP DMA as well, only cherry-picking the "stop poisoning the
GART TLB" really fixed that issue.
But I'm pretty sure that even with "stop poisoning the GART TLB"
back-ported we still have at least one stability issue I can't reproduce.
Christian.
Am 19.06.2014 12:20, schrieb Marek Olšák:
Hi Michel,
3.15 doesn't contain Christian's fix yet, so it should be always
broken for everybody. The fix is currently only in 3.16.
Alternatively, you can cherry-pick the fix to 3.15, but it doesn't
apply cleanly.
There is a workaround in 3.15 which disables sDMA and uses CP DMA for
copying buffers. It seems to help Christian's machine, but not mine.
When I said the kernel driver was broken, I meant that
it was broken *with* the fix applied regardless of which engine was
used for the copying.
Marek
On Thu, Jun 19, 2014 at 3:48 AM, Michel Dänzer <michel@xxxxxxxxxxx> wrote:
On 15.06.2014 21:48, Christian König wrote:
Am 13.06.2014 23:31, schrieb Alex Deucher:
On Fri, Jun 13, 2014 at 11:45 AM, Christian König
<deathsimple@xxxxxxxxxxx> wrote:
Hi Marek,
ah, yes! Piglit in combination with that patch can indeed crash the box.
Going to investigate now that I can reproduce it.
I wonder if it's a clockgating issue with the MC or BIF? You might
try adjusting the rdev->cg_flags (try setting it to 0) in
radeon_asic.c or disabling dpm.
Unfortunately that was just a false alarm.
I was just on a branch which didn't had the "stop poisoning the GART
TLB" patch, after applying this patch I can again let piglit run for the
whole night without a lockup.
No idea what goes wrong when Marek runs piglit, but 3.15.0+"stop
poisoning the GART TLB"+"force_gtt" is rock solid here.
FWIW, 3.15 doesn't survive piglit on my Bonaire either, but 3.14 is
fine. 3.15 seems stable on Kaveri though, but I haven't tried the
force_gtt patch on that yet.
There have also been a number of bug reports about stability regressions
in 3.15 on various SI and CIK cards. It seems likely that at least some
of those are related to this issue as well.
If we can't figure out the problem soon, we probably need to revert the
'Use normal BOs for page tables' and dependent changes at least for 3.15.y?
--
Earthling Michel Dänzer | http://www.amd.com
Libre software enthusiast | Mesa and X developer
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