When a secondary command buffer is encountered, insert an event that
links to the new batch.
This commit leaves intel_measure timestamp buffer objects mmapped,
which is more efficient than mapping/unmapping several times. With
the BOs mapped at all times, timestamp buffers can be managed directly
by intel_measure, where it will iterate over timestamps of linked
secondary buffers.
With timestamp buffers managed by intel_measure, a more efficient and
accurate check for render completion can be moved into intel_measure
from anv/iris.
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Acked-by: Kenneth Graunke <kenneth@whitecape.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7354>
