<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?
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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
<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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<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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<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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