In many cases there isn't enough room in the snapshot region to
store all the IBs from the hanging context. Only store the
last IB1 to be executed (per the CP_IB1_BASE register) and any IB2s
within that IB1 - all other IBs in the hanging context are
marked as GPU objects. The downside to this approach is that after
a system crash, only the snapshot region can be assured to be recovered
from a RAM dump; the list of GPU objects might be skipped. This is
why the critical IBs go in the snapshot to ensure that no matter what
at least the last buffers to execute before the hang are recovered.
The upside is this reduces the pressure on the snapshot region size and
ensures that more of the state can be recovered under normal
circumstances.
Change-Id: Ic0dedbada7869c7f5cc03ed2ed58e996294c1e8c
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
f99f5a66b7