02:53 <icecream95> Uh, this can't be good: rb_tree_splice: Assertion `u == p->right' failed.

02:54 <icecream95> I think pandecode might be missing locking operations on the BO tree?

02:58 <icecream95> Yeah, that seems to be the problem. Two threads are in panfrost_batch_cleanup at the same time

03:05 <HdkR> oopsies :)

04:09 <icecream95> pan_resource_modifier_convert: Assertion `!rsrc->modifier_constant' failed.

04:10 <icecream95> Let me guess: RGB / sRGB reinterpretation for AFBC again?

04:10 <icecream95> I should submit the patch fixing that...

05:34 <icecream95> What is a writeout bundle doing in a *vertex* shader???

05:38 <icecream95> I guess some lowering pass got broken somehow?

05:40 <icecream95> Seems to be something weird with XFB lowering

05:43 <icecream95> lower_xfb_varying got rewritten recently, interesting

07:58 <icecream95> Oops.. now the nir_lower_io_to_temporaries pass I inserted to fix XFB is breaking other things

08:45 <icecream95> Sigh, even glretrace is crashing

08:45 <icecream95> I'm not having a good day, am I?

20:02 <Didgy> Hello. I am a norwegian student with an interest in getting started with GPU driver development as a hobby. I am most interested in Arm Mali GPUs. I figure I should start by getting an SBC that I can debug and learn from reading the Panfrost driver. Do you have any SBCs to recommend? I was considering the RockPro64, but perhaps there is something running a newer SoC out there?

20:05 <macc24> Didgy: vulkan on midgard would be nice to see ;D

20:06 <macc24> but starting with that in my opinion would be quite hard to someone who hasn't been doing gpu driver dev stuff

20:06 <macc24> i can tell you one thing: avoid exynos

20:07 <Didgy> Rockchip seemed like the most interesting SoCs for now, to my untrained eye

20:08 <macc24> tbh you might want to look into stuff with bifrost or valhall gpus; midgard is quite old

20:11 <Didgy> Well, first I just want to learn how to driver development at all. I don't expect to be able to implement features of my own for a while. But I guess the more modern, the more interesting it is to me

20:11 <HdkR> macc24: Don't get anyone's hopes up about Midgard + Vulkan like that. It's misleading for a newcomer.

20:11 <macc24> i've heard some... things about bifrost architecture, i suggest you wait until someone with actual knowledge on mali gpus comes in

20:12 <macc24> HdkR: ok sorry

20:12 <HdkR> And RK3566 SBC is probably pretty good to tinker with though

20:13 <Didgy> I guess I'm primarily interested in the architectures that PanVk are currently targetting

20:16 <Didgy> Which are mainly for Midgard and Bifrost from what I can tell

20:16 <macc24> bifrost and valhall*

20:16 <HdkR> Yea, target of bifrost and valhall

20:16 <HdkR> Midgard isn't well suited for Vulkan

20:17 <macc24> Didgy: if you got issues running the mainline kernel on rk3566 hardware feel free to hit me up

20:17 <Didgy> Thanks

20:17 <HdkR> The Khadas VIM3 is one of the panvk bringup targets

20:17 <Didgy> May I ask why Midgard is not suited for Vulkan?

20:18 <Didgy> Interesting, I just saw a review of the VIM4

20:19 <HdkR> VIM4 is probably fine as well, Same SoC but beefier

20:20 <HdkR> Midgard not being suited towards Vulkan is mostly just design choices and hardware limitations. It wasn't designed around it so you hit issues.

20:52 <Didgy> Okay, so the RockPro64 is out since it is Midgard based

20:53 <Didgy> The Pine Quartz64 does look interesting. So does the Vim3

21:01 <Didgy> How much RAM do you think I would need? I am thinking no more than 4GB

21:05 <Didgy> I have a feeling I won't be able to get by on just 2GB

21:07 <HdkR> Less RAM just means more pain :P

21:08 <Didgy> So how much do you recommend?

21:11 <HdkR> Worst case you can get by with some swap space on your drive. User choice though, whatever you feel comfortable with

21:12 <Didgy> I'm leaning towards the Vim3

21:12 <HdkR> Vim3 and Vim4 would probably both be good choices

21:12 <Didgy> It ended up a bit more pricey than I expected, but I think anything under 200 euros should be acceptable price for me

21:15 <Didgy> Actually nvm, I'll get the Quartz64 since it's much cheaper. Depending on how well things go with the learning and interest, I can splurge for a more expensive one.

21:20 <Didgy> Or not, since it seems like the software is largely unsupported on it

21:20 <Didgy> Back to Vim3 I guess

21:39 <Didgy> Question: How useful would it be to learn graphics driver dev through the RPi4?

21:42 <HdkR> It would be a learning experience still

21:47 <hexdump0815> Didgy: macc24: just an important note - vim4 is _not_ supported by mainline and a completely different soc as the one in the vim3 which might not be clear from the names - so better avoid the vim4 for now

21:48 <HdkR> Ah, poo.

21:54 <Didgy> What about the ROC-RK3566-PC?

22:00 <Didgy> I can't find anyone actually running Linux on it

22:01 <Didgy> So I guess Vim3 is the safe choice

22:15 <Didgy> The Rock 3A seems interesting too

22:25 <anarsoul> quartzpro64 looks promising, but it's not available yet and it may take a while to get mainline linux working on it

22:32 <icecream95> Didgy: My suggestion for starting driver development is to run as many different games as possible, then report a bug whenever something is broken

22:32 <icecream95> But then try to fix the bug yourself, before whoever looks at the issue report (inevitably me) can fix it themselves

22:32 <icecream95> At least that's how I got started!

22:32 <icecream95> Right now this would work better for OpenGL than Vulkan, though

22:32 <macc24> hexdump0815: well... you're talking to someone who can make it run mainline ;)

22:41 <HdkR> I wonder if when comparing an A55 versus an A73, which would win running x86 emulation. OoO A73, or ARMv8.2 capable A55.

22:42 <macc24> i can run benchmarks

22:42 <HdkR> Try with and without TSO mode enabled please :P

22:44 <macc24> well i don't think i am able to do it until next week or something

22:44 <HdkR> I'm assuming A73 will still win due to no instruction scheduling

22:45 <HdkR> But an interesting comparison between RK3566 and A311D there

22:47 <macc24> i could compare mt8183 and rk3566

22:48 <macc24> and try limiting them to be same frequency and same amount of cores

22:48 <macc24> should be Good Enough™ maybe?

22:48 <HdkR> Sounds reasonable

22:51 <macc24> might run the benchmarks in couple of weeks if i can... ugh personal stuff going on

23:24 <HdkR> https://cdn.discordapp.com/attachments/702130548419723294/978075759824494602/Image_2022-05-22_16-22-59.png Clock speed difference is hard to overcome on my device

23:50 <icecream95> Midgard seems to rasterize triangles starting at the bottom and top and moving inwards

23:50 <icecream95> That matches what I was planning to do for the renderer I'm writing...