[PATCH v11 12/13] drm/xe: Do not use stolen memory for DPT on IGFX and AuxCCS

[Tvrtko Ursulin]

With DPT in stolen memory there are occasional pipe crc IGT failures in
tests such as kms_flip_tiling. Allocate a normal system memory object
instead.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at igalia.com>
---
 drivers/gpu/drm/xe/display/xe_fb_pin.c | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/xe/display/xe_fb_pin.c b/drivers/gpu/drm/xe/display/xe_fb_pin.c
index dc912864407e..f605c06f3e51 100644
--- a/drivers/gpu/drm/xe/display/xe_fb_pin.c
+++ b/drivers/gpu/drm/xe/display/xe_fb_pin.c
@@ -183,6 +183,20 @@ static void ggtt_flush_writes(struct xe_ggtt *ggtt)
 	}
 }
 
+static bool try_dpt_stolen(const struct intel_framebuffer *fb, struct xe_bo *bo)
+{
+	/*
+	 * XXX: DPT in stolen memory on IGFX platforms (at least Alderlake)
+	 * suffers from occasional pipe crc IGT failures in tests such as
+	 * kms_flip_tiling.
+	 */
+	if (intel_fb_is_ccs_modifier(fb->base.modifier) &&
+	    !xe_bo_is_vram(bo) && !xe_bo_is_stolen(bo))
+		return false;
+
+	return true;
+}
+
 static int __xe_pin_fb_vma_dpt(const struct intel_framebuffer *fb,
 			       const struct i915_gtt_view *view,
 			       struct i915_vma *vma,
@@ -192,7 +206,7 @@ static int __xe_pin_fb_vma_dpt(const struct intel_framebuffer *fb,
 	struct xe_tile *tile0 = xe_device_get_root_tile(xe);
 	struct xe_ggtt *ggtt = tile0->mem.ggtt;
 	struct drm_gem_object *obj = intel_fb_bo(&fb->base);
-	struct xe_bo *bo = gem_to_xe_bo(obj), *dpt;
+	struct xe_bo *bo = gem_to_xe_bo(obj), *dpt = ERR_PTR(-EINVAL);
 	u32 dpt_size, size = bo->ttm.base.size;
 
 	if (view->type == I915_GTT_VIEW_NORMAL)
@@ -213,7 +227,7 @@ static int __xe_pin_fb_vma_dpt(const struct intel_framebuffer *fb,
 						      XE_BO_FLAG_GGTT |
 						      XE_BO_FLAG_PAGETABLE,
 						      alignment);
-	else
+	else if (try_dpt_stolen(fb, bo))
 		dpt = xe_bo_create_pin_map_at_aligned(xe, tile0, NULL,
 						      dpt_size,  ~0ull,
 						      ttm_bo_type_kernel,
-- 
2.48.0