[Bug 101691] gfx corruption on windowed 3d-apps running on dGPU

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101691

--- Comment #43 from Michel Dänzer <michel at daenzer.net> ---
(In reply to Ben Widawsky from comment #42)
> WRT https://bugs.freedesktop.org/show_bug.cgi?id=101691#c37. Not entirely
> sure what you're getting at. dma_buf core should be handling the coherency
> between the two parties and it's up to the driver implementation to handle
> map/begin_cpu_access etc. to handle appropriately. Assuming we're talking
> about dma_buf.

The buffers are shared via dma_buf, but there shouldn't be any CPU access to
the shared buffers.

My question is whether the i915 driver programs the GPU to treat the pages of
the buffers imported from amdgpu as cacheable or non-cacheable.

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