3 files changed, 9 insertions, 3 deletions
diff --git a/src/gallium/drivers/radeonsi/si_pipe.c b/src/gallium/drivers/radeonsi/si_pipe.c
index 5d7837dd116..676d199618b 100644
--- a/src/gallium/drivers/radeonsi/si_pipe.c
+++ b/src/gallium/drivers/radeonsi/si_pipe.c
@@ -829,6 +829,8 @@ struct pipe_screen *radeonsi_screen_create(struct radeon_winsys *ws,
 		(sscreen->debug_flags & DBG(DCC_MSAA) ||
 		 sscreen->info.chip_class == VI);
 
+	sscreen->cpdma_prefetch_writes_memory = sscreen->info.chip_class <= VI;
+
 	(void) mtx_init(&sscreen->shader_parts_mutex, mtx_plain);
 	sscreen->use_monolithic_shaders =
 		(sscreen->debug_flags & DBG(MONOLITHIC_SHADERS)) != 0;
diff --git a/src/gallium/drivers/radeonsi/si_pipe.h b/src/gallium/drivers/radeonsi/si_pipe.h
index 7a099376021..3a959f98da5 100644
--- a/src/gallium/drivers/radeonsi/si_pipe.h
+++ b/src/gallium/drivers/radeonsi/si_pipe.h
@@ -123,6 +123,7 @@ struct si_screen {
 	bool				has_rbplus;     /* if RB+ registers exist */
 	bool				rbplus_allowed; /* if RB+ is allowed */
 	bool				dcc_msaa_allowed;
+	bool				cpdma_prefetch_writes_memory;
 
 	struct slab_parent_pool		pool_transfers;
 
diff --git a/src/gallium/drivers/radeonsi/si_shader.c b/src/gallium/drivers/radeonsi/si_shader.c
index 6a1293b99d1..5da9ec0bf54 100644
--- a/src/gallium/drivers/radeonsi/si_shader.c
+++ b/src/gallium/drivers/radeonsi/si_shader.c
@@ -5057,9 +5057,12 @@ int si_shader_binary_upload(struct si_screen *sscreen, struct si_shader *shader)
 
 	r600_resource_reference(&shader->bo, NULL);
 	shader->bo = (struct r600_resource*)
-		     pipe_buffer_create(&sscreen->b, 0,
-					PIPE_USAGE_IMMUTABLE,
-					align(bo_size, SI_CPDMA_ALIGNMENT));
+		     si_aligned_buffer_create(&sscreen->b,
+					      sscreen->cpdma_prefetch_writes_memory ?
+						0 : R600_RESOURCE_FLAG_READ_ONLY,
+                                              PIPE_USAGE_IMMUTABLE,
+                                              align(bo_size, SI_CPDMA_ALIGNMENT),
+                                              256);
 	if (!shader->bo)
 		return -ENOMEM;