[PATCH xserver 1/2] modesetting: Fix reverse prime partial update issues on secondary GPU outputs

[Eric Anholt]

Hans de Goede <hdegoede at redhat.com> writes:

> When using reverse prime we do 2 copies, 1 from the primary GPU's
> framebuffer to a shared pixmap and 1 from the shared pixmap to the
> secondary GPU's framebuffer.
>
> This means that on the primary GPU side the copy MUST be finished,
> before we start the second copy (before the secondary GPU's driver
> starts processing the damage on the shared pixmap).
>
> This fixes secondary outputs sometimes showning (some) old fb contents,
> because of the 2 copies racing with each other, for an example of
> what this looks like see:

Is working around the fact that the primary and secondary aren't
cooperating on dmabuf fencing?  Should they be doing that instead?

Or would glamor_flush be sufficient?
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