<thecycoone>
sway crashes (in panfrost) after exiting dosbox-staging with SDL_VIDEODRIVER=wayland, default config
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<icecream95>
thecycoone: 3283c7f4dad ("panfrost: Inline reference counting routines") is the first bad commit
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<tomeu>
robmur01: alyssa: iirc, kernelci is testing s2ram on kevins
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<chewitt>
I made progress with XU4 .. the regulator thing is apparently nothing more than deferred probe
<chewitt>
board boots, attempts to start Kodi
<chewitt>
and then typically faults and locks up
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<chewitt>
so I guess that's the status of T628 support :)
<chewitt>
if anyone has any hacky stuff in a branch somewhere that might help .. I'm all ears
<chewitt>
if not .. off to blob I must go
<chewitt>
not trying to guilt or anything (not that it would work) .. happier to see progress on bifrost !
<daniels>
chewitt: yeah, to be honest, T6xx hasn't seen any movement in a long time, and that it's regressed isn't surprising. but otoh ... this is your chance to get into Panfrost development! :)
<chewitt>
I'm awesome at one-liner stuff like adding missing GPU IDs
<chewitt>
Sadly.. that's about yer lot with me and code
<chewitt>
If it can be scripted and packaged via bash, I'm fine
<daniels>
hey, everyone has to start somewhere
<chewitt>
the moment alyssa starts talking about triangles and swizzles .. there's a whoshing noise as the conversation goes over my head :)
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<tomeu>
alyssa: I'm a bit confused regarding the place of shader_type in the blend descriptor
<tomeu>
if it's about the shader, then why is it in the other member of the union?
<tomeu>
it made more sense to me when it was next to unk2, outside the union
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<alyssa>
thecycoone: icecream: Fix is coming, possibly already landed.
<alyssa>
chewitt: wdym?
<alyssa>
Swizzles are just maps between finite sets.
<alyssa>
Or linear operators on R^4 if you prefer.
<chewitt>
see, you already lost me :)
<chewitt>
ignore, I was just doing a partial "train of thought" thing earlier while poking this XU4 board
<chewitt>
was hoping to use panfrost, but doesn't look possible
<alyssa>
tomeu: shader_type specifies the type of gl_FragColor as outputted by the fragment shader
<alyssa>
so that the Bifrost fixed-function blend hw can ingest that gl_FragColor, convert it into its native format, and do blending.
<thecycoone>
thanks alyssa
<alyssa>
but if a blend shader is used, there's no fixed-function. On Midgard that means gl_FragColor is pushed straight from fragment to blend. If Bifrost is the same, that means the hardware doesn't care about the fragment shader type -- instead, *we* are the ones who have to care (so we have to key the blend shader appropriately)
<alyssa>
As for the output of the blend shader, that's forced to be the native format of the render target, since all the usual format conversion hw is bypassed. Again, that's a software key.
<alyssa>
So it makes sense to be inside the union, it only matters when there's no blend shader.
<cwabbott>
alyssa: actually no, bifrost has a typed tile load/tile store instruction
<cwabbott>
that uses the blend descriptor iirc
<alyssa>
.....Great.
<cwabbott>
no more packing/unpacking things manually!
<alyssa>
Oh, actually that *is* great ^_^
<alyssa>
I mean, Midgard has that too for a subset of formats, but the format is an argument to the instruction, no cmdstreaming.
<cwabbott>
unless I missed something and some stupid formats are unsupported, ofc
<cwabbott>
but iirc the blend shader doesn't have the type at all
<alyssa>
but... the rt format is *definitely* inside the union.
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<alyssa>
(the fixed/blendshader one I mean)
<cwabbott>
I mean, it's not in the shader itself
<cwabbott>
also, you may have noticed that on the blob, the blend instruction writes to R48 or something like that
<alyssa>
Yeah
<cwabbott>
it turns out that BRANCH is actually secretly a call instruction
<cwabbott>
and R48 is the return offset
<cwabbott>
err, BLEND is secretly a call instruction
<cwabbott>
blend shaders end with BRANCH R48
<alyssa>
Wild, but unsurprising given Midgard's stuff.
<alyssa>
I have long suspected r1.w on midgard to be something like that
<tomeu>
alyssa: well, that makes everything suddenly much clearer :p
<alyssa>
tomeu: sorry :P
<tomeu>
thought it was the gl_FragColor of the blend shader, so the resolve engine would know what to do with it :p
<tomeu>
ah ok, was wondering if some scene in glmark2 was triggering it
<alyssa>
thankfully no
<alyssa>
I don't see how RT format is passed.
<alyssa>
Uh maybe I do
<alyssa>
cwabbott: This is insanely subtle, but yes, it's in the blend shader :)
<alyssa>
the tib store instruction op197e8 takes a 64-bit constant
<alyssa>
lower 32-bit I'm just seeing as 0xff000000
<alyssa>
but upper 32-bit is (format << 12)
<cwabbott>
oh, huh
<alyssa>
(you know what else is 12-bits? swizzles. so I bet that's the swizzle on G71 -- swizzles were removed from later bifrost.)
<alyssa>
same deal with the tib load op196e8
<alyssa>
To be more specific, op196e8 is a 3-src
<alyssa>
(0x196e8 >> 6) = 5 == uniform/const hi
<alyssa>
clause type 10,
<alyssa>
tomeu: so inside the union indeed :-)
<ente>
alyssa: thanks for the midgard/bifrost writeup btw
<ente>
it's interesting to see what the differences are and how the architectures work without getting my hands dirty just yet
<ente>
I've poked around in the gitlab before but reading an article is easier to wrap my head around as an outsider
<alyssa>
ente: :)
<alyssa>
The glaring omission in the article is the difference in scheduling ("clauses" for bifrost)
<alyssa>
but saving that for when I write a scheduler and blog about it :P
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<Lyude>
alyssa: going to start getting my odroid-n2 setup now, curious - were you able to get any of the closed mali blobs running on it?
<HdkR>
N2 image ships with closed blobs running on it
<Lyude>
alright cool, so I guess I can use that if I need to grab any disasm
<Lyude>
glad to finally be joining in the fun :)
<alyssa>
Lyude: I never tried
<Lyude>
chewitt, narmstrong - yes, your uboot image does support bootefi :)
<Lyude>
(also thanks!)
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<Lyude>
hey chewitt/narmstrong: I've got a backup plan for getting this odroid setup, but I was wondering if you guys knew whether or not building a uboot with spi support is possible (and where the instructions are for signing uboot builds?)
<Lyude>
going to give a small try on seeing if I can gewt the bootloader on there so I can just use plain old gpt partitioning on the emmc, but if that doesn't work I'll just go the route I did with the vim2 (don't use a paritioning table, build a custom fedora kernel with cmdline partitioning support and use that so that everything just lives on the emmc)
<alyssa>
Nothing like random tests failing on hardware I don't have.
<Lyude>
alyssa: what hw?
<alyssa>
t760
<Lyude>
damn, don't have that either :S
<icecream95>
alyssa: Is this the mod6 branch?
<alyssa>
icecream95: Indeed
<alyssa>
It's definitely passing on rk3399
<icecream95>
I can reproduce the failure
<alyssa>
icecream95: Do you mind sending a dump from MIDGARD_MESA_DEBUG=shaders? thank you :)
<alyssa>
My best guess is some UB somewhere is leading to 32-bit issues