tests: basic ring<->cpu and ring<->ring tests

Using a dummy reloc that doesn't matter to trick the kernel into
synchroizing the rings.

v2: properly apply MI_NOOP workaround to MI_FLUSH_DW and
switch to MI_COND_BATCH_BUFFER_END as a dummy command on the
render ring to avoid PIPE_CONTROL errata.

v3: somebody clever decided that in C, you cound from 1,
i.e. I915_EXEC_RENDER == 1. It works now ...

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

tests/Makefile.am

@@ -46,6 +46,8 @@ TESTS = getversion \
 	gem_storedw_loop_blt \
 	gem_storedw_loop_bsd \
 	gem_storedw_batches_loop \
+	gem_dummy_reloc_loop \
+	gem_ring_sync_loop \
 	$(NULL)
 
 HANG = \