https://bugs.freedesktop.org/show_bug.cgi?id=83500

--- Comment #2 from Grigori Goronzy greg@chown.ath.cx --- Created attachment 105755 --> https://bugs.freedesktop.org/attachment.cgi?id=105755&action=edit Better fix

This is a possibly better fix that only disables DMA if 1D tiling is involved. Please give it a try.

https://bugs.freedesktop.org/show_bug.cgi?id=83500

--- Comment #4 from Christian König deathsimple@vodafone.de --- (In reply to comment #3)

Anyway, in the command stream dump you provided before, it looked like the tiling parameters were totally bogus, mostly all 0. I suspect this needs more investigation.

Yeah, that's what I noticed immediately as well. Maybe attach a gdb to X, set a breakpoint to si_dma_copy_tile and check what those parameters usually look like.

If they aren't usually all zero (which is likely) we should figure out why they are zero in this special case.

https://bugs.freedesktop.org/show_bug.cgi?id=83500

--- Comment #6 from Grigori Goronzy greg@chown.ath.cx --- The tiling parameters don't look bogus and they certainly aren't zero. In the dumped IB there's mt = 1, num_banks = 3, tile_split = 3 in DW 7. Looking at DW 3, there is array_mode = 2, bankw = 0, bankh = 0, mtilea = 0. That might as well be completely wrong for the given surface, but it's not bogus in the sense that the values are invalid.

At first I thought bankw/bankh/mtilea being all set to zero was strange, but this seems to match how libdrm sets up 1D tiled surfaces.

For reference, this is the IB we're talking about: http://pastebin.com/jFWk9bU5

https://bugs.freedesktop.org/show_bug.cgi?id=83500

--- Comment #8 from Christian König deathsimple@vodafone.de --- Oh, yeah you're right got that wrong as well.

But what I hoped to have checked as well is that it sounded like this copy command worked correctly in 90% of all cases and only in a minority just locked up.

Is that correct? Or in other words what makes this special case lock up? Does it work for other resolutions? etc...

https://bugs.freedesktop.org/show_bug.cgi?id=83500

Michel Dänzer michel@daenzer.net changed:

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

--- Comment #10 from Michel Dänzer michel@daenzer.net --- Module: Mesa Branch: master Commit: ae4536b4f71cbe76230ea7edc7eb4d6041e651b4 URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=ae4536b4f71cbe76230ea7edc7e...

Author: Michel Dänzer michel.daenzer@amd.com Date: Tue Nov 11 16:10:20 2014 +0900

radeonsi: Disable asynchronous DMA except for PIPE_BUFFER