#dri-devel on 2023-04-28 — irc logs at oftc.irclog.whitequark.org

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03:51 <hays> when you all are blackbox reversing a GPU driver.... is there a libera channel for that kind of thing? particularly as it generalizes to other related drivers like neural net hardware showing up on some of these SOCs

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07:46 <MrCooper> karolherbst: CI is a big motivator for moving to gitlab though

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09:14 <MrCooper> janesma: FYI, pushing to merge-requests/<number>/head doesn't modify the MR source branch

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09:48 <javierm> jadahl: is there a place were I can read what is needed in the atomic mode settings API to have this "cursor hotspot" support that's needed to remove virt-gpu from mutter's atomic deny list ?

09:49 <javierm> jadahl: I know that you already discussed this with Bilal a little bit, but I'm trying to understand what exactly entails

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09:51 <javierm> jadahl: oh, I see there was a series posted by Zack some time ago: https://lore.kernel.org/all/20220613104529.25fc650a@eldfell/T/

09:56 <emersion> javierm: yeah the Zack series was the latest work on this

09:56 <emersion> javierm: see in particular the replies by Pekka/Jonas/me

09:57 <emersion> i think the consensus from user-space was that we want a cap for user-space to opt-in

09:57 <javierm> emersion: yeah, I'm reading the thread now

09:57 <javierm> makes sense for user-space to opt-in IMO

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10:04 <jadahl> that thread is good to read indeed

10:11 <javierm> jadahl: indeed I just pointed out to Bilal because it explains in great detail what these cursor hotposts are, I wasn't familiar with that concept

10:11 <javierm> emersion: I didn't know that there was a SW fallback

10:11 <javierm> then the driver doesn't expose a cursor plane

10:11 <emersion> yeah, pretty sure all compositors have this

10:12 <javierm> emersion: as Zack mentioned mutter adds it in a deny list. That's how I noticed this, because fixed virtio-gpu to properlty report FB_DAMAGE_CLIPS but didn't work due using the legacy API

10:13 <javierm> for now I patched mutter to remove it but of course have issues with the guest cursor

10:13 <danvet> javierm, if it's all wired up properly then should work with legacy dirtyfb ioctl too

10:13 <javierm> danvet: damage clipping you mean?

10:14 <javierm> hmm, but unsure if makes sense to invest in wiring that. I prefer to push Zack's series forward and have atomic mode settings with virtio-gpu :)

10:17 <javierm> emersion: I don't fully understand Zack pushback to your proposal, since old user-space will keep using the legacy API anyways...

10:17 <javierm> so what could be the drawback of hiding the cursor plane if user-space doesn't opt-in ?

10:18 <emersion> i think Zack wants to force all user-space to properly set the cursor plane's hotspot always

10:18 <emersion> on atomic

10:20 <javierm> emersion: yeah but if you need to modify user-space anyways to set the new mouse cursor hotspot info, then what's the problem with also set the cap ?

10:20 <emersion> yup

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10:21 <emersion> and the cap allows user-space using atomic but not hotspot-aware to display properly

10:21 <javierm> emersion: and yeah, SW cursor fallback is slower but at the very least old user-space that doesn't set the cursor hotspot info can do that and have a functional driver

10:21 <emersion> indeed, slow better than incorrect

10:21 <javierm> so hiding the (broken) cursor plane makes totally sense to me

10:22 <emersion> well, glad we all agree :)

10:22 <javierm> emersion: it seems Zack doesn't though :) but I haven't finished reading the thread yet

10:22 <emersion> i think at the end Zack ended up agreeing somewhat iirc

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10:25 <javierm> emersion: Ok, let me read the rest and I think Bilal or me can re-spin a v2 with your suggestions and resend

10:25 <emersion> nice!

10:29 <emersion> swick[m]: \o/ https://a.uguu.se/lTYVZJmv.png

10:29 <emersion> this is in the HDMI 2.1 VSDB

10:30 <emersion> a bit worried that it's 0 to say "i don't flicker"

10:30 <emersion> (so maybe sinks set it incorrectly)

10:30 <emersion> but at least it's there

10:33 <swick[m]> nice. now we need the same for everything that's not HDMI

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10:33 <swick[m]> and somehow get manufacturers to actually use it :s

10:34 <swick[m]> btw, I'm on PTO right now, back on monday for work

10:37 <emersion> swick[m]: maybe we can hope that the HDMI VSDB gets advertised on DP as well?

10:37 <emersion> ah, feel free to ignore me then!

10:39 <emersion> hrm i didn't capture EDIDs on both DP and HDMI during the hackfest

10:39 <emersion> so hard to tell for these displays

10:41 <swick[m]> we should probably have done that in hindsight

10:41 <emersion> maybe we can ask Carlos to do this for us

10:42 <swick[m]> but there are displays without hdmi support and there the vsdp makes no sense

10:42 <danvet> javierm, yeah, should be a one-liner to plug in the compat helper

10:42 <emersion> yes, i agree it's not a very reliable way to find out

10:42 <emersion> maybe i should try to see if DisplayID has anything similar

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10:43 <javierm> danvet: oh, I'll take a look then

10:43 <emersion> but i don't have super high hopes

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10:44 <swick[m]> edid-decode also tells me there is more vrr stuff in the hdmi vsdb

10:44 <swick[m]> Supports media rates below VRRmin (CinemaVRR)

10:44 <swick[m]> Supports negative Mvrr values

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10:45 <emersion> yea i see this in the spec too

10:46 <emersion> the spec is kinda hard to read tbh

10:46 <emersion> many references to variables defined elsewhere

10:52 <danvet> javierm, maybe we should add a warn_once if that isn't set correctly like we have for the missing prop?

10:52 <danvet> since atomic drivers really shouldn't hand-roll this I think

10:53 <danvet> but maybe i915 is a legit enough exception

10:53 <danvet> so maybe could just check that there is a ->dirty callback and not necessarily that it's the default compat helper

10:55 <javierm> danvet: Ok, let me dig that I'm not familiar with the legacy KMS compat layer

10:56 <danvet> drm_atomic_helper_dirtyfb() but with fbdev generic helper you need to call the different setup func for that iirc

10:57 <javierm> danvet: hmm, virtio-gpu already uses it https://elixir.bootlin.com/linux/latest/source/drivers/gpu/drm/virtio/virtgpu_display.c#L63

10:58 <danvet> hm then it should get passed through for legacy kms too

10:58 <danvet> maybe mutter hasn't wired that up?

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10:59 <javierm> danvet: could be, I'll take a look. Bilal asked jadahl (or was Robert Mader?) and pointed out to him about not using the atomic API

10:59 <javierm> BilalElmoussaoui[m]: o/

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11:06 <hch12907> fyi, irc doesn't show Robert and Bilal's messages

11:06 <javierm> :(

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11:08 <hch12907> <karolherbst> "so what's the value discourse..." <- I think fedora wants it because their ML is more forum-y

11:08 <emersion> daniels: do you think we could allow unauth users to talk, it doesn't seem like we have had spam from these in #freedesktop?

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11:11 <hch12907> But even without discourse, gitlab alone is already pretty nice for mesa & drm I think. Discussions can be done using the issue tracker.

11:11 <daniels> emersion: sure, let's give it a try and see what happens - as long as we have the Matrix bridge we're always going to have this frigging problem

11:12 <emersion> yea :/

11:12 <emersion> and lack of SASL on OFTC makes this rather painful

11:12 <emersion> at least we don't kick unauth users

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11:16 <emersion> alright let's see how this goes

11:16 <emersion> will revert if we get spam

11:18 <BilalElmoussaoui[m]> i guess it should work now?

11:18 <emersion> yes

11:18 <javierm> BilalElmoussaoui[m]: welcome to this side of the IM tunnel :)

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11:19 <BilalElmoussaoui[m]> awesome :)

11:19 <daniels> emersion: thanks!

11:22 <mlankhorst> Do i fast forward drm-misc-fixes to drm/drm-next too?

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11:27 <karolherbst> MrCooper: sure, but we can do CI later or people will add CI once we are on gitlab and we can discuss in MRs if proposed ideas are good or not

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17:48 <alyssa> I'm not really sure what's happening with https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/22695

17:48 <alyssa> Got two soft-naks. I don't want to override the objections (because frankly I don't disagree) but I'm not sure where we go from here

17:48 <alyssa> and I can't tell if this is stalled on me needing to change the code or others that haven't reviewed it yet

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18:18 <alyssa> although maybe I do want to do ineg propagation in my backend instead of implementing isub

18:19 <alyssa> so then i can drop isubshl_agx at least, and also don't need to introduce imsub

18:19 <alyssa> gfxstrand: does NVIDIA have imsub?

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18:19 <alyssa> and do you care about having that in NIR rather than ingesting imad(x, y, ineg(z)) into your backend?

18:25 <DUOLabs[m]> I've been trying to integrate venus into QEMU for MacOS, but when I try to run vkcube, all I get is "stuck in ring seqno wait with iter at". Looking at the source code, it's waiting for something, but I'm not sure what.

18:25 <alyssa> oh, woof, apparently I even have (a * b) + (c << #d) in one op

18:26 <alyssa> likely sufficiently obscure it's not worth bothering NIR over though

18:26 <alyssa> unless maybe it comes up with address arithmetic, which is entirely possible.

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18:33 * alyssa writes the neg fusing rules at least

18:33 <alyssa> should cut the NIR side combinatorics in half, at least

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18:53 <alyssa> 6 files changed, 71 insertions(+), 3 deletions(-)

18:53 <alyssa> see this is just an obnoxious amount of code needed for something I can do in 2 lines of opt_algebraic :|

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18:58 <alyssa> IDK. Maybe I want better pattern matching in my backend stuff

18:58 <alyssa> Or maybe lots and lots of NIR opcodes really is ok.

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20:13 <gfxstrand> alyssa: What's imsub?

20:14 <gfxstrand> Oh, yeah, ineg is allowed on the src2 of imad

20:14 <gfxstrand> I'll figure out how to propagate it somehow.

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