[PATCH v2 3/9] drm/tegra: gem: Remove premature import restrictions

[Thierry Reding]

From: Thierry Reding <treding at nvidia.com>

All the display related blocks on Tegra require contiguous memory. Using
the DMA API, there is no knowing at import time which device will end up
using the buffer, so it's not known whether or not an IOMMU will be used
to map the buffer.

Move the check for non-contiguous buffers/mappings to the tegra_dc_pin()
function which is now the earliest point where it is known if a DMA BUF
can be used by the given device or not.

v2: add check for contiguous buffer/mapping in tegra_dc_pin()

Reviewed-by: Daniel Vetter <daniel.vetter at ffwll.ch>
Signed-off-by: Thierry Reding <treding at nvidia.com>
---
 drivers/gpu/drm/tegra/gem.c   |  7 -------
 drivers/gpu/drm/tegra/plane.c | 11 +++++++++++
 2 files changed, 11 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/tegra/gem.c b/drivers/gpu/drm/tegra/gem.c
index 6dfad56eee2b..bc15b430156d 100644
--- a/drivers/gpu/drm/tegra/gem.c
+++ b/drivers/gpu/drm/tegra/gem.c
@@ -440,13 +440,6 @@ static struct tegra_bo *tegra_bo_import(struct drm_device *drm,
 		err = tegra_bo_iommu_map(tegra, bo);
 		if (err < 0)
 			goto detach;
-	} else {
-		if (bo->sgt->nents > 1) {
-			err = -EINVAL;
-			goto detach;
-		}
-
-		bo->iova = sg_dma_address(bo->sgt->sgl);
 	}
 
 	bo->gem.import_attach = attach;
diff --git a/drivers/gpu/drm/tegra/plane.c b/drivers/gpu/drm/tegra/plane.c
index 163b590be224..cadcdd9ea427 100644
--- a/drivers/gpu/drm/tegra/plane.c
+++ b/drivers/gpu/drm/tegra/plane.c
@@ -129,6 +129,17 @@ static int tegra_dc_pin(struct tegra_dc *dc, struct tegra_plane_state *state)
 				goto unpin;
 			}
 
+			/*
+			 * The display controller needs contiguous memory, so
+			 * fail if the buffer is discontiguous and we fail to
+			 * map its SG table to a single contiguous chunk of
+			 * I/O virtual memory.
+			 */
+			if (err > 1) {
+				err = -EINVAL;
+				goto unpin;
+			}
+
 			state->iova[i] = sg_dma_address(sgt->sgl);
 			state->sgt[i] = sgt;
 		} else {
-- 
2.23.0