[PATCH 10/14] drm/xe: Check the PTE local memory bit for initial FB in stolen

[Ville Syrjala <ville.syrjala@linux.intel.com>]

From: Ville Syrjälä <ville.syrjala@linux.intel.com>

Do the PTE local memory bit check also for the case when
the initial FB lives in stolen. We have two cases to worry about
here: MTL+ with LMEMBAR, and pre-MTL with stolen being just
(slightly special) physical memory.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
---
 drivers/gpu/drm/xe/display/xe_initial_plane.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/xe/display/xe_initial_plane.c b/drivers/gpu/drm/xe/display/xe_initial_plane.c
index 0dabc5709d01..d0a9f8599096 100644
--- a/drivers/gpu/drm/xe/display/xe_initial_plane.c
+++ b/drivers/gpu/drm/xe/display/xe_initial_plane.c
@@ -26,9 +26,14 @@ static bool is_pte_local(u64 pte)
 	return pte & XE_GGTT_PTE_DM;
 }
 
+static bool has_lmembar(struct xe_device *xe)
+{
+	return GRAPHICS_VERx100(xe) >= 1270;
+}
+
 static bool need_pte_local(struct xe_device *xe)
 {
-	return IS_DGFX(xe);
+	return IS_DGFX(xe) || has_lmembar(xe);
 }
 
 static struct xe_bo *
@@ -79,6 +84,7 @@ initial_plane_bo(struct xe_device *xe,
 			    &phys_base);
 	} else {
 		struct ttm_resource_manager *stolen;
+		u64 pte;
 
 		stolen = ttm_manager_type(&xe->ttm, XE_PL_STOLEN);
 		if (!stolen) {
@@ -86,6 +92,13 @@ initial_plane_bo(struct xe_device *xe,
 			return NULL;
 		}
 
+		pte = xe_ggtt_read_pte(tile0->mem.ggtt, base);
+
+		if (is_pte_local(pte) != need_pte_local(xe)) {
+			drm_err(&xe->drm, "Initial plane PTE has bad local memory bit\n");
+			return NULL;
+		}
+
 		phys_base = base;
 		flags |= XE_BO_FLAG_STOLEN;
 	}
-- 
2.52.0