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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<Ermine> I didn't quite get it what "Scanout buffer". As far as I understand, it means framebuffer which device will send to the screen. But this definition means there can be at most one scanout buffer per display, and that seems wrong
<Ermine> (sorry if my understanding is really wild)
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<K900> In what context?
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<Ermine> Oh, there are different meainings...
<K900> In general, there is no fixed "scanout buffer" on modern GPUs
<K900> The display hardware just reads from somewhere in VRAM
<K900> But also this just feels like a very XY question
<Ermine> I'm not trying to solve anything now, just clarifying terminology
<K900> Well, did I answer your question then?
<MrCooper> Ermine: "scanout buffer" is generally used to refer to a buffer which is currently being scanned out by a display plane
<MrCooper> or which is intended to be scanned out
<javierm> Ermine: I guess is in the context of simpledrm? (since you asked about simpledrm before)
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<Ermine> javierm: no, it's unrelated
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<Ermine> K900: sorry, but not quite
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<Ermine> MrCooper: thank you!
<K900> The real answer is "it's complicated" because GPUs do all kinds of compositing and postprocessing in hardware
<K900> So there may not even be a Scanout Buffer containing exactly what the display sees
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<Ermine> got it
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<Ermine> Actually there are slides on this topic which describes those... My bad
<K900> Just keep in mind that whatever slides you find will probably be describing specific hardwre
<K900> s/hardwre/hardware/
<K900> Even if they don't say exactly what hardware they're describing
<MrCooper> K900: scanout buffer is a generic concept, not a HW-specific one
<K900> Yes, but slides describing a specific scanout pipeline will be pretty specific to the hardware
<Ermine> "framebuffers -> plane -> CRTC -> encoder -> connector -> display" seems generic
<K900> At that level of abstraction, more or less, yes
<K900> But the exact operations supported in the pipeline will differ a lot
<K900> And some steps may be skipped especially on mobile
<Ermine> but it seems like the abstraction DRM maintains
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<K900> Yes, but not all hardware will have support for planes
<K900> And some hardware will actually have the CRTC and encoder as one thing
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<Ermine> https://docs.kernel.org/gpu/drm-internals.html#memory-manager-initialization --- seems like some invalid link resulted in "See ? for details."
<Ermine> Ah, it is just plain "?" in the doc source
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