This GPU has a larger instruction store, so more memory
needs to be reserved for saving shader state when context
switching.
The initial vertex and pixel partitioning of the
instruction store also needs to be different.
Write the retired timestamp into the expected location. This fixes
userspace crashes after resume when the retired timestamp is read
as 0 instead of the expected last timestamp.
Userspace will set a flag in the context if preambles are in use. If
they are, we can safely skip save and restore commands for the
context. GMEM save/restore is still required. To improve performance,
preamble commands are skipped when the context hasn't changed since
the last issueibcmds.
from Code Aurora
