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 Ol??k: > 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 D?nzer <michel at daenzer.net> wrote: >> On 15.06.2014 21:48, Christian K?nig wrote: >>> Am 13.06.2014 23:31, schrieb Alex Deucher: >>>> On Fri, Jun 13, 2014 at 11:45 AM, Christian K?nig >>>> <deathsimple at vodafone.de> 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 D?nzer | http://www.amd.com >> Libre software enthusiast | Mesa and X developer >> _______________________________________________ >> dri-devel mailing list >> dri-devel at lists.freedesktop.org >> http://lists.freedesktop.org/mailman/listinfo/dri-devel
