minigbm: add drv_bo_flush
As an optimization, we would like to separate buffer flush/writeback
and unmap. This patch adds the appropriate entry point in our
internal driver API. Overall, the proposed flow is:
- drv_bo_map(..) creates a mapping and associated metadata
- drv_bo_flush(..) writes memory from any cache or temporary
buffer back to memory
- drv_bo_unmap(..) flushes, and frees the mapping and
associated metadata.
The drv_bo_flush function just does some sanity checks on
the map data at this point, but otherwise is a no-op.
BUG=chromium:764871
TEST=gbmtest, mmap_test -g on eve
Change-Id: If306f066a76bc5e0943c1170e2d6933fa5630eff
Reviewed-on: https://chromium-review.googlesource.com/668218
Commit-Ready: Gurchetan Singh <gurchetansingh@chromium.org>
Tested-by: Gurchetan Singh <gurchetansingh@chromium.org>
Reviewed-by: Stéphane Marchesin <marcheu@chromium.org>
diff --git a/drv.h b/drv.h
index e4678a1..f9a7a87 100644
--- a/drv.h
+++ b/drv.h
@@ -113,7 +113,9 @@
void *drv_bo_map(struct bo *bo, uint32_t x, uint32_t y, uint32_t width, uint32_t height,
uint32_t flags, struct map_info **map_data, size_t plane);
-int drv_bo_unmap(struct bo *bo, struct map_info *map_data);
+int drv_bo_unmap(struct bo *bo, struct map_info *data);
+
+int drv_bo_flush(struct bo *bo, struct map_info *data);
uint32_t drv_bo_get_width(struct bo *bo);