[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 #42 from Ben Widawsky <ben at bwidawsk.net> ---
SNA_POWERSAVE effects a good amount more than what I initially thought.
1. Potentially extra flushing.
2. Prefer blit ring over render ring.

Corruption itself looks like X-tiled cachelines. And the changes in SNA totally
effect cacheline behavior; blitter uses different caches, extra flushing does
extra flushes :)

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.

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