ChanServ changed the topic of #dri-devel to: <ajax> nothing involved with X should ever be unable to find a bar
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<Kayden> on what now?
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<imirkin> dcbaker: like the list of video frames? it's here:
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<robclark> pinchartl: hmm, do any drivers support R8 or R16 scanout? I could kinda imagine that those formats are only defined for the benefit of userspace (ie. for things like nv12 fallback samples-as-two-textures).. does any driver support R8/R16 greyscale scanout? I've not seen greyscale displays since the dark old ages of giant glass tubes.. but I guess if you have a use-case defining more drm fourcc's is ok
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<pinchartl> robclark: I have a use case on the camera side :-)
<robclark> hmm, ok.. I think you should assume anything missing in drm_fourcc.h is just things no one else needed yet, and send a patch to add what you need ;-)
<pinchartl> ok. I'll prototype first, and eventually send a patch then
<pinchartl> thanks for the feedback
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<robclark> np
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<anholt> jekstrand: I'm heading out camping tomorrow, not sure if I'll have time to check on or push any MRs.
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<glennk> robclark, R8 scanout = C8 with an identity color map?
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<pq> glennk, that's what I'd guess, but at least with C8 you know what color you get. If you scan out R8, do you get gray shades or red shades? :-)
<pq> hmm, wonder what the EDID colorimetry for a monochrome non-gray display would look like...
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<pq> if it was a monochrome display, then all chromaticities and white point would be the same point, right?
<pq> but if it's single-channel di-chromatic, like white/blue...
<glennk> can toss in C12 format which some ancient hardware supported
<pq> clearly we need I12 and L12 formats
<pq> ..not
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<emersion> dj-death: mind if i just merge this MR?
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<mriesch> hi all. i am trying to port a minimal driver for the rockchip vop2 from the sdk to mainline and i am stuck at the point where the framebuffer dev should probe. the error message is "Cannot find any crtc or sizes"
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<mriesch> apparently, all mode_set are zero so who sets these in the first place?
<danvet> probe callbacks on the connecor provide the mode list
<danvet> fill_modes callback
<danvet> plus helper mentioned in there
<danvet> plus well everything linked from there should get you started
<tzimmermann> airlied, danvet, drm-misc-next-fixes is empty. no PR this week
<danvet> mriesch, also I strongly recommend you bring up your driver without fbdev/fbcon at first
<danvet> and just use kms interface directly with maybe modetest or whatever from libdrm
<danvet> or igt tests
<mriesch> danvet, thanks for the pointer(s)
<danvet> the locking with fbdev on top is nasty and often means you just die silently
<mriesch> danvet and thanks for the hint. actually, i am just trying to bring the connector up to test the recent dw_hdmi patches
<mriesch> everything else is a plus at the moment :-)
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<dj-death> emersion: looks fine to me
<emersion> alright, thanks!
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<airlied> a
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<MrCooper> let me one-up that: b
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<icecream95> å
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<hakzsam> jekstrand: any reasons why OpAtomicISub is emitted as atomic_add+ineg? same question for inc/dec. Note that AMD has instructions for them, so maybe we could introduce atomic sub/inc/dec and lower for hw that don't support them?
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<jekstrand> hakzsam: First off, I think the canonicalization helps with optimization. If you did have atomic_sub, you'd want to switch to it late to remove the neg, not use it right away in case someone was doing atomic_sub(p, -x).
<jekstrand> hakzsam: Also, the assumption is the atomic is massivly more expensive than the ineg so why bother
<jekstrand> But we could have an optimization for it.
<jekstrand> As for inc/dec, we figured that you can detect atomic_add(p, -1) easily enough in the back-end that it wasn't worth the bother. We do in our back-end compiler.
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<jekstrand> But if someone wanted to make that a NIR pass, I guess I wouldn't be opposed.
<hakzsam> yeah, it can also be done in ACO and seems actually simpler that adding new intrinsics all over :)
<jekstrand> :)
<jekstrand> Yeah, adding new atomic intrinsics is such a pain...
<hakzsam> quite
<HdkR> Need an atomic_not IR op so llvmpipe can emit optimal atomic not on x86 ;)
<HdkR> oop, messed up. s/not/neg/g
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<dschuermann> hakzsam: the AMD inc/dec have conditional semantics and don't exactly match the SPIR-V semantics
<jekstrand> What sort of conditional semantics?
<hakzsam> dschuermann: yeah, I figured that
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<dschuermann> jekstrand: MEM[ADDR] = (tmp >= DATA) ? 0 : tmp + 1;
<dschuermann> so, for plain inc, you'd need to pass DATA=-1u
<jekstrand> ah
<dschuermann> which isn't really beneficial over passing DATA=1 and using add ;)
<jekstrand> Yup. Ours don't have such semantics so it lets us use a shorter message
<cwabbott> jekstrand: i think is ready for review again
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<mriesch> danvet: i disabled the framebuffer emulation as you suggested and tried to set a mode with modetest. but i think the underlying problem still remains and no modesets are reported by the encoder
<mriesch> i traced it down a bit and it seems that the encoder is not enabled to begin with. who or what should enable the encoder?
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* alyssa studies GenXML
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<jekstrand> cwabbott: One potential bug and 3 nits. Otherwise, first two look good, I think.
<alyssa> @intel people - For significant chunks of per-gen code that is the same for all versions before X and for all versions after X, does it make sense to special case only compiling it twice instead of for every single gen and having tons of duplicated symbols?
<mriesch> ok, to be precise we were talking about connectors before. the connector is present, but the helper .get_modes is never called. so i think i am asking which entity should call it at which point
<pq> 3 nits is pretty dim. *badabum tshhh*
<alyssa> I'm worried about regressing driver code size from duplicating everything 5x all of a sudden
<alyssa> also worried about compile
<emersion> you're the only one in the room who knows about colorimetry, pq!
<cwabbott> jekstrand: i just checked and all the _imm builder helpers use uint64_t
<pq> emersion, aaha! Evidently I'm not. :-D
<jekstrand> cwabbott: Really?
<cwabbott> yup
<jekstrand> Ok, then. Ignore that.
<jekstrand> I thought through it at one point in time and made a careful choice based on C sign extension rules. Let's keep consistent with past me.
<cwabbott> nir_iadd_imm, nir_isub_imm, nir_imul_imm, nir_imm_intN_t do at least
<jekstrand> Yup
<cwabbott> jekstrand: damn, making me put on my thinking cap :)
<jekstrand> ?
<cwabbott> with your bug
<cwabbott> this whole mask thing is just really really fiddly
<cwabbott> jekstrand: ok, updated again
<jekstrand> Yeah
<jekstrand> It si
<jekstrand> is
<jekstrand> cwabbott: sure it's lt and not le?
<jekstrand> Oh, wait... you flipped arguments around. Gotta think
<cwabbott> yeah, there's no nir_ugt
<cwabbott> maybe we should have that as a builder thing
<jekstrand> One of the few reasons I wish NIR was C++: We could make builder helpers take immediates and SSA defs in the same argument.
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<jekstrand> cwabbott: Yeah, having builder things for those would be nice
<alyssa> jekstrand: Please read some LLVM source code and reconsider your wishes 😋
<jekstrand> alyssa: I did say "few"
<alyssa> 😉
<alyssa> One of the many reasons I wish NIR were Rust...
<alyssa> ("Please read 'Learning Rust With Entirely Too Many Linked Lists' and reconsider")
<jekstrand> I've read that post.
<HdkR> C11 has way to do function overloading with _Generic
<jekstrand> Yeah.... no.
<alyssa> ld: error: undefined symbol: panfrost_pipe_format_v7
<alyssa> erg
<jekstrand> I guess we could make some of the builder helpers do. They are auto-generated. But also, no.
<alyssa> alyssa@maud:~/mesa/build/src/panfrost/lib$ nm libpan-format-v7.a | tail -n 1
<alyssa> 0000000000000000 R panfrost_pipe_format_7
<alyssa> it's right there! :<
<alyssa> .....oh i missed a v
* alyssa shows herself out
<ccr> just today I was staring at a piece of Perl code that had a syntax error and it took several minutes to "see" that I had written ~= instead of =~
<jenatali> Clang and GCC support attribute((overloadable)) in C, but MSVC doesn't have an equivalent unfortunately
<JoshuaAshton> MSVC has no stdatomic.h either :(
<JoshuaAshton> We have to roll our own really cursed atomic impl in vkd3d-proton
<jekstrand> This is why people should use clang on Windows. :P
<alyssa> jekstrand: 2nded
<tango_> we need a language haflway between C and C++
<JoshuaAshton> Maybe Microsoft should ship that by default and make it default then :frog:
<HdkR> ooo, __attribute__((overloadable)) is cute
<JoshuaAshton> LTO (LTCG) is still entirely broken in MSVC and produces complete garbage on any project you through at it :-/
<tango_> was overloadable introduced with opencl support in clang?
<tango_> because opencl c has lots of overloaded functions
<jekstrand> __attribute__((overloadable)) is how it's done for OpenCL C, yes.
<jekstrand> If jenatali would have just implemented CLOn12 using MSVC as the front-end, we might have these nice toys. :-P
<jekstrand> Who am I kidding? They would have implemented it for OpenCL C and then still not allowed it with regular C.
<jenatali> I don't even want to think about that...
<alyssa> tango_: C+
<jenatali> JoshuaAshton: We use LTCG for D3D, and I haven't heard of any problems with getting garbage out
<JoshuaAshton> You must be very very lucky, I have had a success rate of 0
<alyssa> tango_: incidentally, the maximal grade of any CS assignment written using it
<tango_> 8-D
<JoshuaAshton> same goes with a bunch of my other game dev friends
<jenatali> Weird, what kinds of garbage?
<tango_> the real question is which parts to choose. I'm not even sure what your complaints about LLVM's usage of C++ was, for example
<jenatali> Like, inefficient garbage? Or incorrect garbage?
<JoshuaAshton> incorrect
<tango_> (that was for alyssa)
<JoshuaAshton> If I enable LTCG in one of my projects, for some reason the mouse gets trapped in the centre of the screen and I can't look around ingame anymore
<jenatali> Was that recent? If so, absolutely file feedback on that, the compiler teams take that pretty seriously
<JoshuaAshton> It's been around for yeeears
<alyssa> tango_: oh that was just a dig at llvm's aesthetics
<tango_> alyssa: I must confess I've never looked at its internals. I'm just happy it compiles our cuda code producing 3x faster kernels
<ccr> always better not to look behind the curtain
<tango_> if that comes at the cost of the llvm source code itself being the most horrible code ever written, I'm OK with that
<tango_> ccr: then again, our code would probably offend alyssa's sense of taste too
<alyssa> almost certainly
<jekstrand> LLVM certainly isn't the most horrible code ever written (have you looked at dEQP?) and there are definitely some gems in there, but it can be pretty intractable in places too.
<alyssa> examples of good code to me:
<alyssa> - most of NIR
<alyssa> - anything written by anholt
<alyssa> - that's it tbh
<tango_> alyssa: it's all C++ with several layers of indirections, conditional inheritans and enable_ifs ALL AROUND
<jekstrand> alyssa: Don't look at our vec4 compiler if you want to keep that 2nd one intact. :)
<tango_> inheritance, too
<alyssa> jekstrand: Heh
<HdkR> Don't need enable_if with C++20 concepts. Instead you get require require ;)
<tango_> HdkR: lol
<tango_> HdkR: our C++ standard choice is dictated by nvidia
<tango_> we only migrated to C++11 like two years ago
* jekstrand barely even knows last decade's C++, much less this modern stuff.
<jenatali> JoshuaAshton: Btw regarding stdatomic.h, apparently it's happening:
<HdkR> tango_: Sounds like a sucky place to be
<tango_> HdkR: you have no idea how happy I was when we ditched older CUDA versions without C++11 support
<jekstrand> Oh, I've got a pretty good idea. :)
<tango_> and how much cleaner the C++11 stuff is. too bad we haven't finished cleaning up everything
<tango_> now I only need a sycl backend for our stuff, and better opencl support in mesa, and I can be happy
<JoshuaAshton> My favourite part is when spamming volatile fixes LTCG bugs despite none of the code being cross-compilation unit...
<jenatali> C++14 and 17 added a handful of nice features too, and I'm looking forward to starting to use some C++20 eventually
<JoshuaAshton> I wrote a very evil C++20 generic (math) Vector struct
<JoshuaAshton> Surprisingly has much better codegen than doing stuff simply
<tango_> jenatali: for us the real advantage of C++14 is that it ships with some nice type alias templates, but those can be implemented in C++11 too
<alyssa> I like C99
<tango_> JoshuaAshton: evil in what sense?
<alyssa> I try not to use language invented after I was born.
<tango_> alyssa: my clinfo is all C99, if it's any consolation
<JoshuaAshton> tango_: It's all std transform and stuff
<JoshuaAshton> (just for a sideproject of mine)
<tango_> alyssa: but some things would have been much easier to write in C++
<jekstrand> alyssa: If I had those principles, you wouldn't like my code. :P
<alyssa> jekstrand: 👶
<JoshuaAshton> I want to like C but I get bit by so many type safety issues that really make me go Grrrr
<JoshuaAshton> I want typesafe flags
<JoshuaAshton> and other nice things
<tango_> wait you can have constexpr constructors?
<jenatali> Same
<JoshuaAshton> We were bit by a typesafe flag bug today in vkd3d-proton and I am sad there is no compiler extension for this
<jenatali> tango_: Yeah you can do pretty much anything constexpr if you go new enough. Even dynamic memory management (as long as it's trivial)
<tango_> woah
<alyssa> GenXML question -- how do you handle common enums in common code?
<jekstrand> Every time I think C++ gives me type safety, shortly thereafter I try to make some data structure const-correct, pull my hair out, and go back to ignoring it and writing C.
<jekstrand> alyssa: What do you mean?
<alyssa> (Common across hw generations)
<JoshuaAshton> I have never had problems with const-correctness really
<JoshuaAshton> even C has const correctness so :shrug:
<JoshuaAshton> just not as strict...
<alyssa> A function like "map_pipe_format_to_zs_format" returning an enum hw_zs_format, where hw_zs_format is identical across every generation
<jekstrand> C has const. It doesn't have any correctness. :P
<JoshuaAshton> yes :frog:
<alyssa> Does that have to be duplicated for every gen just because hw_zs_format is defined separately in every xml?
<tango_> JoshuaAshton: interesting use of static_assert instead of enable_if for the constructor on line 20
<jekstrand> const-correctness is mostly possible in C++. It just means thinking very hard and typing everything (including all bugs!) at least twice.
<jekstrand> alyssa: Yes
<JoshuaAshton> tango_ I am not familiar with enable_if which is why I didn;t use it
<JoshuaAshton> How would I take advantage of that there?
<jekstrand> alyssa: That's why we have things like our format enum elsewhere.
<alyssa> jekstrand: Hm.
<tango_> JoshuaAshton: enable_if was I think the first C++11 feature I learned. but in constructors it's a PITN to use
<JoshuaAshton> Oh interesting
<JoshuaAshton> I see now
<tango_> JoshuaAshton: so I'm sure that whatever alternative would be aesthetically less pleasing than what you have there
<tango_> JoshuaAshton: enable_if is a godsend if you don't have if constexpr and you want to do template specialization based on partial matching of template argument feature
<JoshuaAshton> Enable if might be better though as it wouldn't trigger the constructor in that case?
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<tango_> JoshuaAshton: you're still catching it at compile time, the only difference is what kind of error you get
<JoshuaAshton> true...
* alyssa is super overwhelmed trying to untangle this code
<tango_> JoshuaAshton: with static_assert you get a nice message to your liking, with enable_if you only get errors about constructors not being found
<tango_> which is best ... dunno
<tango_> alyssa: it would be so much easier if it was C++ ...
<tango_> (;-))
<alyssa> tango_: No, it wouldn't.
<tango_> alyssa: I know, I'm joking
<jenatali> tango_: enable_if is good for having 2 implementations of things without constexpr if, not for hiding things in bad cases - static_assert is much better for that
<tango_> JoshuaAshton: you know, I might actually steal this static_assert idea of yours
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<tango_> jenatali: yeah
<JoshuaAshton> nice
<tango_> jenatali: we use enable_if to do partial function template specialization
<JoshuaAshton> also for some reason that dot product produces much better code than just doing a.x * b.x + a.y * b.y + a.z * b.z
<JoshuaAshton> why? who knows!
<JoshuaAshton> on clang its the same
* tango_ is still at the constructors
<JoshuaAshton> on GCC and MSVC it's much better
<tango_> JoshuaAshton: what do you mean by better?
<jenatali> Yeah. I wrote a large mess that implements our entire D3D driver layer by template-generating passthrough functions based on pattern matching function signatures. I'm familiar with enable_if and partial specializations :P
<JoshuaAshton> 4 instruction sshorter :frog:
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<cwabbott> JoshuaAshton: "The old optimizer is extremely sensitive to changes, and getting a fix into 16.11 with a point-fix for this issue would cause additional churn which puts much other code at risk." <- I wonder what lovecraftian horror their old code is that they can't even be confident in bug fixes
<tango_> JoshuaAshton: fma?
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<JoshuaAshton> tango_: What about fma?
<tango_> JoshuaAshton: does your dot implementation produce more compact code because it uses fma more aggressively?
<tango_> also wtf with the float cast for length
<tango_> ok there's only 3 things I don't like about your code: length, normalize and the stream output function
<tango_> everything else is lovely
<JoshuaAshton> Yeah, I'm sorry about the float cast :(
<JoshuaAshton> There is always a chance the length can be fractional so I will probably take the floating point type that fits the best
<JoshuaAshton> ie. float or double :p
<JoshuaAshton> there is lengthSqr if you wanna just get it as the type you put in and deal with it yourself
<JoshuaAshton> normalize could probably use length square
<JoshuaAshton> wait hm
<JoshuaAshton> yeah or something idk, I'll look at it when I touch this silly sideproject again when travelling :)
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<tango_> JoshuaAshton: my objecting to length is that it does * (1.0f/length) instead of just /length. I know why, but I prefer more accurate things
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<tango_> JoshuaAshton: otoh you could do things for more accuracy with a different signature, like using hypot for the accurate length
<tango_> (of course you'd have to implement hypot in the first place)
<JoshuaAshton> std hypot :)
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<JoshuaAshton> but ye
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<tango_> JoshuaAshton: not std hypot of course, you'd have to implement one specific for your types 8-)
<JoshuaAshton> I have learnt not to really trust the std math functions ever
<JoshuaAshton> std::lerp is a fucking joke
<JoshuaAshton> especially the MSVC impl
<tango_> std::abs all components, sort by magnitude in decreasing order, divide by the first, sqrt of the dot product of this, and multiply by the largest
<tango_> should be trivial to implement with transforms 8-)
<tango_> but you stil need a traits structure to tell you what type to use for length
<tango_> or just use double or make it a template parameter defaulting to double
<JoshuaAshton> ehhh, double default pooey, I'd probably take sizeof(T) and choose based on that by default
<tango_> I mean for hypot it makes sense
<tango_> you don't use hypot if you don't want accuracy, because hypot sucks performance-wise
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<mriesch> danvet: turns out the connector does not report the HDMI HPD status correctly. i'll withdraw my question ;-)
<danvet> mriesch, yeah that's all covered with the helpers, it's split into detect and probe iirc
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<mriesch> danvet: OK, thanks. the main issue is the hotplug detection in the rk3568 HDMI driver then. maybe the IP version in this chip needs something extra
<danvet> mriesch, double-check your cable/monitor with another chip first
<danvet> sometimes the hpd just doesn't work ime
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<mriesch> danvet: good point, will check that.
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<enunes> hi all, I have been doing some work to enable CI for lima again. I created a lava setup with a few boards following and I think it is ready for some initial tests now. who can help me with the next steps?
<enunes> anholt maybe ?
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<agd5f> mriesch, some board vendors may not wire up the pins correctly as well.
<mriesch> agd5f: hmm... i'll have a look at that as well
<anholt> enunes: if you mean the runner registration, I'm gone for a few days so maybe hit up daniels or bentiss for registration token and sanity checking your runnerrs.
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* jekstrand assigns "Drop" to marge
<jekstrand> It's got 6 👍, 3 🎉, and an ack.
<daniels> enunes: o/
<daniels> nice to see it!
<daniels> jekstrand: it has every positive emoji from me as well
<jekstrand> :D
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<daniels> ^ including that
<bl4ckb0ne> nice diff
<jekstrand> bl4ckb0ne: For better or worse, that won't make a dent in my stats. :-/
<bl4ckb0ne> anyway it deserves a little rocket emoji
<jekstrand> Feel free to give it one. :)
<jekstrand> Oh, so you did. :D
<bl4ckb0ne> :)
<enunes> daniels anholt awesome, thank you! so I would like some additional feedback before actually adding it
<daniels> enunes: do yo uhave a MR link?
<enunes> so my setup has a network with the lava master, a separate arm64 node that is what I intend to register as the runner, and 3 boards to be controlled by that runner
<enunes> should I do it like that with 1 runner and parallel: 3 ?
<jekstrand> Goodbye, and good riddance!
<enunes> I would also need meson-gxl-s805x-libretech-ac.dtb available in the CI archives, so I believe I need to change that tag to force a new container image to be generated?
<enunes> and the tag I would add to the runner is mesa-ci-aarch64-lava-lima
<daniels> enunes: correct you do, and I would also make it parallel 4 just so you can parallelise container/artifact transfer against LAVA execution
<daniels> you can add tags with the gitlab-runner registration
<daniels> is $DEQP_PARALLEL right for your board? you want to have it at roughly the number of cores available per-device, but if they have low memory, capped at whatever number stops you from OOMing
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<enunes> hm I didn't look much into that one, these boards dont have that much memory so maybe 1-2 would be better there
<daniels> well yeah, whatever the highest number is which will get them through without banging into the OOM killer :)
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<enunes> I see in the scripts and existing lava jobs there is a lot of handling for caching things locally, is it ok if I dont have that?
<daniels> enunes: sure, that's fine - it used to be pretty critical for reducing transfer, but these days it's a time optimisation for not pulling large rootfs over the Atlantic multiple times
<daniels> I can share our nginx config with you if you like; it's a pretty trivial caching proxy
<enunes> alright good to know, I think for now I will skip that, with my tests so far it has been only a few seconds to download the images
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<daniels> yeah, that doesn't seem like a bottleneck tbh :)
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<jekstrand> krh: Thought you wouldn't care to know that, aparently, there are less than 3k lines of your code left in src/intel
* jekstrand is running git blame stats just for giggles.
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<enunes> daniels: I submit , will use that to try a few validation runs before removing WIP
<enunes> thanks for the help so far
<daniels> enunes: np, great to see it back! I've flipped notifications on for it, but do please ping me when you're confident with it and ready for review :)
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