radeonsi: disallow constant buffers with a 64-bit address in slot 0

State trackers must use a user buffer or const_uploader,
or set pipe_resource::flags same as const_uploader->flags.

Reviewed-by: Samuel Pitoiset <[email protected]>

2 files changed, 9 insertions, 1 deletions

diff --git a/src/gallium/drivers/radeonsi/si_descriptors.c b/src/gallium/drivers/radeonsi/si_descriptors.c
index 009e8031058..96525fd21b0 100644
--- a/src/gallium/drivers/radeonsi/si_descriptors.c
+++ b/src/gallium/drivers/radeonsi/si_descriptors.c
@@ -1214,6 +1214,12 @@ static void si_pipe_set_constant_buffer(struct pipe_context *ctx,
 	if (shader >= SI_NUM_SHADERS)
 		return;
 
+	if (slot == 0 && input && input->buffer &&
+	    !(r600_resource(input->buffer)->flags & RADEON_FLAG_32BIT)) {
+		assert(!"constant buffer 0 must have a 32-bit VM address, use const_uploader");
+		return;
+	}
+
 	slot = si_get_constbuf_slot(slot);
 	si_set_constant_buffer(sctx, &sctx->const_and_shader_buffers[shader],
 			       si_const_and_shader_buffer_descriptors_idx(shader),
diff --git a/src/gallium/drivers/radeonsi/si_get.c b/src/gallium/drivers/radeonsi/si_get.c
index a67daa5eae7..6e6149a39ef 100644
--- a/src/gallium/drivers/radeonsi/si_get.c
+++ b/src/gallium/drivers/radeonsi/si_get.c
@@ -268,12 +268,14 @@ static int si_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
 	case PIPE_CAP_TILE_RASTER_ORDER:
 	case PIPE_CAP_MAX_COMBINED_SHADER_OUTPUT_RESOURCES:
 	case PIPE_CAP_CONTEXT_PRIORITY_MASK:
-	case PIPE_CAP_CONSTBUF0_FLAGS:
 		return 0;
 
 	case PIPE_CAP_FENCE_SIGNAL:
 		return sscreen->info.has_syncobj;
 
+	case PIPE_CAP_CONSTBUF0_FLAGS:
+		return R600_RESOURCE_FLAG_32BIT;
+
 	case PIPE_CAP_NATIVE_FENCE_FD:
 		return sscreen->info.has_fence_to_handle;