[PATCH v3 5/8] drm/xe: Handle DPT in system memory

[Tvrtko Ursulin]

If DPT is allocated from system memory it will be created in the default
write-back cached mode. This means we need to flush it after populating
otherwise nothing works.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at igalia.com>
---
 drivers/gpu/drm/xe/display/xe_fb_pin.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/xe/display/xe_fb_pin.c b/drivers/gpu/drm/xe/display/xe_fb_pin.c
index bf47ba38e1e5..d11a003880dc 100644
--- a/drivers/gpu/drm/xe/display/xe_fb_pin.c
+++ b/drivers/gpu/drm/xe/display/xe_fb_pin.c
@@ -3,6 +3,7 @@
  * Copyright © 2021 Intel Corporation
  */
 
+#include <drm/drm_cache.h>
 #include <drm/ttm/ttm_bo.h>
 
 #include "i915_vma.h"
@@ -206,6 +207,8 @@ static int __xe_pin_fb_vma_dpt(const struct intel_framebuffer *fb,
 
 	if (dpt->vmap.is_iomem && !xe_bo_is_vram(bo))
 		ggtt_flush_writes(tile0->mem.ggtt);
+	else if (!xe_bo_is_vram(dpt) && !xe_bo_is_stolen(dpt))
+		drm_clflush_virt_range(dpt->vmap.vaddr, dpt_size);
 
 	vma->dpt = dpt;
 	vma->node = dpt->ggtt_node[tile0->id];
-- 
2.48.0