What does this MR do and why?
pvr: Fix csb control stream extension
Previously we reserved space for a stream link and whenever we ran out of space in the current bo, allocated a new one, and emitted a link to it. This is problematic as stream links can only be emitted at state update boundaries so the handling could have produced a corrupted control stream.
That's fixed by using a
relocation_mark set by the driver to
indicate where a state update was last started, so csb can relocate
the whole update into the new bo and link to it.
Signed-off-by: Karmjit Mahil Karmjit.Mahil@imgtec.com