#asahi-gpu on 2025-04-24 — irc logs at oftc.catirclogs.org

2024-07-16 04:52 ChanServ changed the topic of #asahi-gpu to: Asahi Linux GPU development (no user support, NO binary reversing) | Keep things on topic | GitHub: https://alx.sh/g | Wiki: https://alx.sh/w | Logs: https://alx.sh/l/asahi-gpu

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18:02 <alyssa> Oh jesus

18:02 <alyssa> I just discovered a serious bug affecting both our gl & vk drivers

18:03 <alyssa> only by accident

18:03 <alyssa> jannau: going to retag if it's not too late for today

18:03 <alyssa> this is not a regression or anything but

18:04 <alyssa> "random gpu memory corruption due to a misunderstanding of the hardware" seems like it could explain, some things

18:06 <jannau> alyssa: I have builds in my uapi copr but I wouldn't say too late

18:06 <alyssa> OK

18:07 <jannau> does it make sense to test if it fixes parallel CTS runs

18:09 <alyssa> .....Yeah, it does. I will do that too, thanks

18:10 <alyssa> I don't *think* it will, but, not impossible

18:16 <alyssa> ...Oh shit and I bet I know what that legacy sparse layout is

18:16 <alyssa> and .. probably we should be using it, actually, but one problem at a time

18:16 <alyssa> ahhh

18:16 <alyssa> r/e eureka momenta are rare these days for m1

18:16 <alyssa> but apparently still some things left T_T

18:17 <alyssa> ugh and that's why the blob twiddles the null textures too

18:18 <alyssa> ugh this is insane

18:18 <alyssa> I guess one of Apple's debug tools wants to check whether null textures are ever accessed

18:20 <alyssa> [GPUDebug] Null texture access executing kernel function "ColorCorrection" encoder: "Keyframing.SurfaceWarpFuser.InverseWarpKeyframe", dispatch: 2

18:20 <alyssa> https://developer.apple.com/forums/thread/727492

18:20 <alyssa> ahahah

18:20 <alyssa> well, I'm glad there's a reason for all this craziness.

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18:31 <alyssa> https://rosenzweig.io/0001-asahi-do-not-use-Null-layout.patch the fix

18:34 <alyssa> oh interesting looking a bit more carefully

18:34 <alyssa> this shouldn't affect vk in practice, due to a happy accident with the memory layout chosen

18:34 <alyssa> but gl, yeah, gl has got to be broken

18:34 <alyssa> (this also means it doesn't fix CTS)

18:36 <alyssa> cts'ing now, will retag soon

18:54 <jannau> new build underway

19:01 <alyssa> CTS passed

19:03 <alyssa> anyway, that explains why my unrelated $day_job work was randomly faulting

19:03 <alyssa> back to work

19:03 <alyssa> dogfooding \o/

19:07 <jannau> tagged the kernel with the uapi, expecting bug reports any minute

19:17 <alyssa> heheh fair enough

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