freedreno/a6xx: Allocate and program tessellation buffer

Tessellation needs a couple of buffers that should hold the entire
output from a full VS+TCS draw call.

Signed-off-by: Kristian H. Kristensen <[email protected]>
Acked-by: Eric Anholt <[email protected]>
Reviewed-by: Rob Clark <[email protected]>

3 files changed, 44 insertions, 0 deletions

diff --git a/src/gallium/drivers/freedreno/a6xx/fd6_gmem.c b/src/gallium/drivers/freedreno/a6xx/fd6_gmem.c
index 708347931ac..470e972f9e5 100644
--- a/src/gallium/drivers/freedreno/a6xx/fd6_gmem.c
+++ b/src/gallium/drivers/freedreno/a6xx/fd6_gmem.c
@@ -650,6 +650,8 @@ emit_binning_pass(struct fd_batch *batch)
 	uint32_t x2 = gmem->minx + gmem->width - 1;
 	uint32_t y2 = gmem->miny + gmem->height - 1;
 
+	debug_assert(!batch->tessellation);
+
 	set_scissor(ring, x1, y1, x2, y2);
 
 	emit_marker6(ring, 7);
@@ -1499,6 +1501,27 @@ emit_sysmem_clears(struct fd_batch *batch, struct fd_ringbuffer *ring)
 }
 
 static void
+setup_tess_buffers(struct fd_batch *batch, struct fd_ringbuffer *ring)
+{
+	struct fd_context *ctx = batch->ctx;
+
+	batch->tessfactor_bo = fd_bo_new(ctx->screen->dev,
+			batch->tessfactor_size,
+			DRM_FREEDRENO_GEM_TYPE_KMEM, "tessfactor");
+
+	batch->tessparam_bo = fd_bo_new(ctx->screen->dev,
+			batch->tessparam_size,
+			DRM_FREEDRENO_GEM_TYPE_KMEM, "tessparam");
+
+	OUT_PKT4(ring, REG_A6XX_PC_TESSFACTOR_ADDR_LO, 2);
+	OUT_RELOCW(ring, batch->tessfactor_bo, 0, 0, 0);
+
+	batch->tess_addrs_constobj->cur = batch->tess_addrs_constobj->start;
+	OUT_RELOCW(batch->tess_addrs_constobj, batch->tessparam_bo, 0, 0, 0);
+	OUT_RELOCW(batch->tess_addrs_constobj, batch->tessfactor_bo, 0, 0, 0);
+}
+
+static void
 fd6_emit_sysmem_prep(struct fd_batch *batch)
 {
 	struct pipe_framebuffer_state *pfb = &batch->framebuffer;
@@ -1521,6 +1544,9 @@ fd6_emit_sysmem_prep(struct fd_batch *batch)
 	OUT_RING(ring, A6XX_CP_SET_MARKER_0_MODE(RM6_BYPASS) | 0x10); /* | 0x10 ? */
 	emit_marker6(ring, 7);
 
+	if (batch->tessellation)
+		setup_tess_buffers(batch, ring);
+
 	OUT_PKT7(ring, CP_SKIP_IB2_ENABLE_GLOBAL, 1);
 	OUT_RING(ring, 0x0);
 
diff --git a/src/gallium/drivers/freedreno/freedreno_batch.c b/src/gallium/drivers/freedreno/freedreno_batch.c
index 737a87a8dc6..f0dd8148229 100644
--- a/src/gallium/drivers/freedreno/freedreno_batch.c
+++ b/src/gallium/drivers/freedreno/freedreno_batch.c
@@ -166,6 +166,12 @@ batch_fini(struct fd_batch *batch)
 		batch->tile_fini = NULL;
 	}
 
+	if (batch->tessellation) {
+		fd_bo_del(batch->tessfactor_bo);
+		fd_bo_del(batch->tessparam_bo);
+		fd_ringbuffer_del(batch->tess_addrs_constobj);
+	}
+
 	fd_submit_del(batch->submit);
 
 	util_dynarray_fini(&batch->draw_patches);
diff --git a/src/gallium/drivers/freedreno/freedreno_batch.h b/src/gallium/drivers/freedreno/freedreno_batch.h
index ecee0a87878..5061186f1b5 100644
--- a/src/gallium/drivers/freedreno/freedreno_batch.h
+++ b/src/gallium/drivers/freedreno/freedreno_batch.h
@@ -224,6 +224,18 @@ struct fd_batch {
 
 	/** set of dependent batches.. holds refs to dependent batches: */
 	uint32_t dependents_mask;
+
+	/* Buffer for tessellation engine input
+	 */
+	struct fd_bo *tessfactor_bo;
+	uint32_t tessfactor_size;
+
+	/* Buffer for passing parameters between TCS and TES
+	 */
+	struct fd_bo *tessparam_bo;
+	uint32_t tessparam_size;
+
+	struct fd_ringbuffer *tess_addrs_constobj;
 };
 
 struct fd_batch * fd_batch_create(struct fd_context *ctx, bool nondraw);