4 files changed, 89 insertions, 6 deletions

diff --git a/drivers/gpu/drm/rcar-du/rcar_du_drv.c b/drivers/gpu/drm/rcar-du/rcar_du_drv.c
index 62dfd1b66db0..806c68823a28 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_drv.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_drv.c
@@ -529,7 +529,11 @@ DEFINE_DRM_GEM_CMA_FOPS(rcar_du_fops);
 
 static const struct drm_driver rcar_du_driver = {
 	.driver_features	= DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
-	DRM_GEM_CMA_DRIVER_OPS_WITH_DUMB_CREATE(rcar_du_dumb_create),
+	.dumb_create		= rcar_du_dumb_create,
+	.prime_handle_to_fd	= drm_gem_prime_handle_to_fd,
+	.prime_fd_to_handle	= drm_gem_prime_fd_to_handle,
+	.gem_prime_import_sg_table = rcar_du_gem_prime_import_sg_table,
+	.gem_prime_mmap		= drm_gem_prime_mmap,
 	.fops			= &rcar_du_fops,
 	.name			= "rcar-du",
 	.desc			= "Renesas R-Car Display Unit",
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_kms.c b/drivers/gpu/drm/rcar-du/rcar_du_kms.c
index ca29e4a62816..eacb1f17f747 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_kms.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_kms.c
@@ -19,6 +19,7 @@
 #include <drm/drm_vblank.h>
 
 #include <linux/device.h>
+#include <linux/dma-buf.h>
 #include <linux/of_graph.h>
 #include <linux/of_platform.h>
 #include <linux/wait.h>
@@ -325,6 +326,51 @@ const struct rcar_du_format_info *rcar_du_format_info(u32 fourcc)
  * Frame buffer
  */
 
+static const struct drm_gem_object_funcs rcar_du_gem_funcs = {
+	.free = drm_gem_cma_free_object,
+	.print_info = drm_gem_cma_print_info,
+	.get_sg_table = drm_gem_cma_get_sg_table,
+	.vmap = drm_gem_cma_vmap,
+	.mmap = drm_gem_cma_mmap,
+	.vm_ops = &drm_gem_cma_vm_ops,
+};
+
+struct drm_gem_object *rcar_du_gem_prime_import_sg_table(struct drm_device *dev,
+				struct dma_buf_attachment *attach,
+				struct sg_table *sgt)
+{
+	struct rcar_du_device *rcdu = to_rcar_du_device(dev);
+	struct drm_gem_cma_object *cma_obj;
+	struct drm_gem_object *gem_obj;
+	int ret;
+
+	if (!rcar_du_has(rcdu, RCAR_DU_FEATURE_VSP1_SOURCE))
+		return drm_gem_cma_prime_import_sg_table(dev, attach, sgt);
+
+	/* Create a CMA GEM buffer. */
+	cma_obj = kzalloc(sizeof(*cma_obj), GFP_KERNEL);
+	if (!cma_obj)
+		return ERR_PTR(-ENOMEM);
+
+	gem_obj = &cma_obj->base;
+	gem_obj->funcs = &rcar_du_gem_funcs;
+
+	drm_gem_private_object_init(dev, gem_obj, attach->dmabuf->size);
+	cma_obj->map_noncoherent = false;
+
+	ret = drm_gem_create_mmap_offset(gem_obj);
+	if (ret) {
+		drm_gem_object_release(gem_obj);
+		kfree(cma_obj);
+		return ERR_PTR(ret);
+	}
+
+	cma_obj->paddr = 0;
+	cma_obj->sgt = sgt;
+
+	return gem_obj;
+}
+
 int rcar_du_dumb_create(struct drm_file *file, struct drm_device *dev,
 			struct drm_mode_create_dumb *args)
 {
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_kms.h b/drivers/gpu/drm/rcar-du/rcar_du_kms.h
index 8f5fff176754..789154e19535 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_kms.h
+++ b/drivers/gpu/drm/rcar-du/rcar_du_kms.h
@@ -12,10 +12,13 @@
 
 #include <linux/types.h>
 
+struct dma_buf_attachment;
 struct drm_file;
 struct drm_device;
+struct drm_gem_object;
 struct drm_mode_create_dumb;
 struct rcar_du_device;
+struct sg_table;
 
 struct rcar_du_format_info {
 	u32 fourcc;
@@ -34,4 +37,8 @@ int rcar_du_modeset_init(struct rcar_du_device *rcdu);
 int rcar_du_dumb_create(struct drm_file *file, struct drm_device *dev,
 			struct drm_mode_create_dumb *args);
 
+struct drm_gem_object *rcar_du_gem_prime_import_sg_table(struct drm_device *dev,
+				struct dma_buf_attachment *attach,
+				struct sg_table *sgt);
+
 #endif /* __RCAR_DU_KMS_H__ */
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_vsp.c b/drivers/gpu/drm/rcar-du/rcar_du_vsp.c
index 23e41c83c875..b7fc5b069cbc 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_vsp.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_vsp.c
@@ -187,17 +187,43 @@ int rcar_du_vsp_map_fb(struct rcar_du_vsp *vsp, struct drm_framebuffer *fb,
 		       struct sg_table sg_tables[3])
 {
 	struct rcar_du_device *rcdu = vsp->dev;
-	unsigned int i;
+	unsigned int i, j;
 	int ret;
 
 	for (i = 0; i < fb->format->num_planes; ++i) {
 		struct drm_gem_cma_object *gem = drm_fb_cma_get_gem_obj(fb, i);
 		struct sg_table *sgt = &sg_tables[i];
 
-		ret = dma_get_sgtable(rcdu->dev, sgt, gem->vaddr, gem->paddr,
-				      gem->base.size);
-		if (ret)
-			goto fail;
+		if (gem->sgt) {
+			struct scatterlist *src;
+			struct scatterlist *dst;
+
+			/*
+			 * If the GEM buffer has a scatter gather table, it has
+			 * been imported from a dma-buf and has no physical
+			 * address as it might not be physically contiguous.
+			 * Copy the original scatter gather table to map it to
+			 * the VSP.
+			 */
+			ret = sg_alloc_table(sgt, gem->sgt->orig_nents,
+					     GFP_KERNEL);
+			if (ret)
+				goto fail;
+
+			src = gem->sgt->sgl;
+			dst = sgt->sgl;
+			for (j = 0; j < gem->sgt->orig_nents; ++j) {
+				sg_set_page(dst, sg_page(src), src->length,
+					    src->offset);
+				src = sg_next(src);
+				dst = sg_next(dst);
+			}
+		} else {
+			ret = dma_get_sgtable(rcdu->dev, sgt, gem->vaddr,
+					      gem->paddr, gem->base.size);
+			if (ret)
+				goto fail;
+		}
 
 		ret = vsp1_du_map_sg(vsp->vsp, sgt);
 		if (ret) {