OSDN Git Service
i965: Reserve batchbuffer space for a closing MI_REPORT_PERF_COUNT.
In order to use the Observability Architecture effectively, we'll need
to take snapshots of the OA counters via MI_REPORT_PERF_COUNT at the
start and end of each batch.
Experimentation reveals that we need to flush before and after each
MI_REPORT_PERF_COUNT to get working values. For simplicitly, I chose to
use intel_batchbuffer_emit_mi_flush(), which unfortunately expands to
triple pipe controls on Sandybridge.
We may want to start computing per-generation reserved batch space to
avoid the insanity of Sandybridge's PIPE_CONTROL cost. That said, much
of this cost existed before I rewrote the query object support to use
hardware contexts, so it's at least not entirely new.
Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Eric Anholt <eric@anholt.net>