minigbm: More sophisticated gbm_bo_map/gbm_bo_unmap

We previously added the gbm_bo_map/gbm_bo_unmap (see CL:393927)
entry points since we wanted to do driver-specific detiling during
screenshot capture tests.  We ignored most the parameters and mapped
the entire buffer.  This CL adds the ability to:

1) Return the starting address within a byte given a specific x, y
   in the buffer.

2) Handle the case where there are more than one kernel buffers
   per buffer object.  Currently, only the Exynos driver would use
   this capability.

BUG=chromium:653284
TEST=Ran cros_gralloc with modified code

CQ-DEPEND=CL:393927

Change-Id: I19d75d2f16489c0184e96305fb643f18477e1cdb
Reviewed-on: https://chromium-review.googlesource.com/395066
Commit-Ready: Gurchetan Singh <gurchetansingh@chromium.org>
Tested-by: Gurchetan Singh <gurchetansingh@chromium.org>
Reviewed-by: Stéphane Marchesin <marcheu@chromium.org>

1 files changed, 3 insertions, 1 deletions

diff --git a/rockchip.c b/rockchip.c
index ae6c15b..ae0b25f 100644
--- a/rockchip.c
+++ b/rockchip.c
@@ -50,7 +50,7 @@ static int rockchip_bo_create(struct bo *bo, uint32_t width, uint32_t height,
 	return 0;
 }
 
-static void *rockchip_bo_map(struct bo *bo)
+static void *rockchip_bo_map(struct bo *bo, struct map_info *data, size_t plane)
 {
 	int ret;
 	struct drm_rockchip_gem_map_off gem_map;
@@ -66,6 +66,8 @@ static void *rockchip_bo_map(struct bo *bo)
 		return MAP_FAILED;
 	}
 
+	data->length = bo->total_size;
+
 	return mmap(0, bo->total_size, PROT_READ | PROT_WRITE, MAP_SHARED,
 		    bo->drv->fd, gem_map.offset);
 }