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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<karolherbst> airlied: any
<karolherbst> airlied: do you have LLVM assertions enabled?
<karolherbst> because it's an assert inside LLVM
<karolherbst> might as well be an LLVM bug
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<airlied> karolherbst: and it didn't happen with llvm17?
<karolherbst> correct
<karolherbst> I'm on LLVM 55172b7005a6f972272f6d79f2b0d15063bc1b1c btw
<airlied> I did get a crash on lgamma test that was more out there
<karolherbst> but anyway, looks like some LLVM pass doing weird things
<airlied> LLVM ERROR: Instruction Combining did not reach a fixpoint after 1 iterations
<airlied> don't think that's a friday thing to tackle
<airlied> okay this build should have debug and asserts
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<tleydxdy> so, if I initialize a buffer in vulkan and read the content without initializing it. would I potentially read content leftover from other processes?
<airlied> karolherbst: got LLVM_ENABLE_EXPENSIVE_CHECKS on?
<karolherbst> good question
<karolherbst> nope, it's off
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<alyssa> gfxstrand: AGX has imad
<alyssa> but it also allows a left-shift on the addend, so I have a special imadshl_agx for it
<Sachiel> intel had imad too
<Sachiel> but raja didn't like it
<dcbaker> Sachiel: I see what you did there
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<jenatali> tleydxdy: on Windows at least, no
<tleydxdy> what about on linux? I'm pretty sure with e.g. X sometimes I would see an application display some leftover from other application when it first start for example.
<tleydxdy> so I'm tending towards that vram content are not being cleaned up by linux
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<tleydxdy> but I want to confirm this...
<airlied> yes on Linux in some cases
<tleydxdy> what prompted my train of thought is this, my first reaction was "so what if local mem is leaky, vram is already leaky" https://blog.trailofbits.com/2024/01/16/leftoverlocals-listening-to-llm-responses-through-leaked-gpu-local-memory/
<tleydxdy> then I wonder if application can guard against vram leak. I'm pretty sure they can't cus kernel can swap out their buffer without application knowing
<tleydxdy> what's the situation on system memory then, do kernel (or is there a kconfig) that let kernel zero out pages before giving it to userspace?
<airlied> yeah system memory is zeroed
<tleydxdy> hmm is that the default?
<airlied> yes
<tleydxdy> cool
<tleydxdy> ig maybe a patch to zero out vram would be interesting?
<tleydxdy> do kernel at least zero the vram when it migrates a bo?
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<airlied> I think there are some bits around for amdgpu
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<airlied> it's not really one place to do it, it's a per-driver thing
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<tleydxdy> maybe a ttm callback to clear bo?
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<gfxstrand> alyssa: NV also has funny shift things on adds
<gfxstrand> What's with that?
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<dolphin> airlied: sent drm-intel-next-fixes (yeah, was looking to do it yesterday but ran out of time)
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<MrCooper> tleydxdy airlied: see https://patchwork.freedesktop.org/series/127807/ ; once that lands, making amdgpu finally always clear BOs should be essentially a flip of a switch away
<MrCooper> tleydxdy: note that user-space drivers may re-use BOs from a local cache instead of allocating from the kernel, in which case it's the user-space driver's responsibility (at least it shouldn't leak anything from other processes though)
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<tleydxdy> MrCooper: very cool
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<jani> daniels: istr asking this before, but don't recall the answer... is it possible to set up git pre-receive hooks on gitlab based repos? I'm thinking /git/drm/drm-intel.git/hooks/pre-receive and dim "--push-option fdo.pushedWithDim=this-was-pushed-with-dim-and-not-manually"
<jani> demarchi: ^
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<daniels> jani: oh, that's a really good point
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<demarchi> daniels: afair it's possible for self hosted
<demarchi> ops, that should be to jani ^
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<gfxstrand> Are messages to mesa-dev getting through? Or are the archives just slow?
<daniels> gfxstrand: what are you expecting to see that isn't there?
<daniels> the last I see both in my inbox and in the archives is https://lists.freedesktop.org/archives/mesa-dev/2024-January/226100.html
<daniels> ah I see, you sent a message but it was moderated since the address wasn't a list member
<daniels> released it now
<gfxstrand> Ugh... I must have my old e-mail address in the list
<gfxstrand> I can fix that
<daniels> np, it's allowlisted now
<gfxstrand> perils of silently switching e-mail addresses. I hit a different one today with my old @collabora e-mail.
* mattst88 checks mesa-dev and sees email about mesa not building with... python 2.6?!
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<Calandracas> just want to confirm: rusticl doesn't support online compilation of clcpp?
<Calandracas> Its not a problem, I can still run the sources through clang and llvm-spirv, just a minor convinience while developing
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<mattst88> kisak: I was looking at https://lists.freedesktop.org/archives/mesa-dev/2024-January/226102.html -- looks like a different issue
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<apinheiro> gfxstrand, I just checked and skimmed your email. Really interesting (thanks btw), and we would really answer it. But having said so ... any reasonable reply would need to wait until Monday, as is midnight now, and I prefer to have a fresh mind before answering. That also include Iago is really good at fully disconnecting on weekends.
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