[PATCH 2/4] drm/xe: add bind time pat index to xe_bo structure

[Juha-Pekka Heikkila]

Add BO bind time pat index member to xe_bo structure and store
pat index from xe_vma to xe_bo.

Signed-off-by: Juha-Pekka Heikkila <juhapekka.heikkila at gmail.com>
---
 drivers/gpu/drm/xe/xe_bo_types.h | 12 ++++++++++++
 drivers/gpu/drm/xe/xe_pt.c       | 22 ++++++++++++++++++----
 2 files changed, 30 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/xe/xe_bo_types.h b/drivers/gpu/drm/xe/xe_bo_types.h
index 14ef13b7b421..6d599f1e846b 100644
--- a/drivers/gpu/drm/xe/xe_bo_types.h
+++ b/drivers/gpu/drm/xe/xe_bo_types.h
@@ -91,6 +91,18 @@ struct xe_bo {
 
 	/** @vram_userfault_link: Link into @mem_access.vram_userfault.list */
 		struct list_head vram_userfault_link;
+
+	/**
+	 * @pat_index: The pat index requested when bind this BO
+	 */
+	u16 pat_index;
+
+	/**
+	 * @has_sealed_pat_index: The pat index is sealed because this BO is
+	 * pinned as framebuffer. This is to prevent flipping compression
+	 * on/off from framebuffers while in use.
+	 */
+	bool has_sealed_pat_index;
 };
 
 #define intel_bo_to_drm_bo(bo) (&(bo)->ttm.base)
diff --git a/drivers/gpu/drm/xe/xe_pt.c b/drivers/gpu/drm/xe/xe_pt.c
index de1030a47588..c72cb75d993c 100644
--- a/drivers/gpu/drm/xe/xe_pt.c
+++ b/drivers/gpu/drm/xe/xe_pt.c
@@ -1208,10 +1208,11 @@ __xe_pt_bind_vma(struct xe_tile *tile, struct xe_vma *vma, struct xe_exec_queue
 	struct dma_fence *fence;
 	struct invalidation_fence *ifence = NULL;
 	struct xe_range_fence *rfence;
+	struct xe_bo *bo = xe_vma_bo(vma);
 	int err;
 
 	bind_pt_update.locked = false;
-	xe_bo_assert_held(xe_vma_bo(vma));
+	xe_bo_assert_held(bo);
 	xe_vm_assert_held(vm);
 
 	vm_dbg(&xe_vma_vm(vma)->xe->drm,
@@ -1252,8 +1253,21 @@ __xe_pt_bind_vma(struct xe_tile *tile, struct xe_vma *vma, struct xe_exec_queue
 		return ERR_PTR(-ENOMEM);
 	}
 
+	/*
+	 * On Xe2 BO which was pinned as framebuffer before with different
+	 * PAT index cannot be bound with different PAT index. This is
+	 * to prevent switching CCS on/off from framebuffers on the fly
+	 * with Xe2.
+	 */
+	if (bo) {
+		if (bo->has_sealed_pat_index && bo->pat_index != vma->pat_index)
+			return ERR_PTR(-EINVAL);
+
+		bo->pat_index = vma->pat_index;
+	}
+
 	fence = xe_migrate_update_pgtables(tile->migrate,
-					   vm, xe_vma_bo(vma), q,
+					   vm, bo, q,
 					   entries, num_entries,
 					   syncs, num_syncs,
 					   &bind_pt_update.base);
@@ -1287,8 +1301,8 @@ __xe_pt_bind_vma(struct xe_tile *tile, struct xe_vma *vma, struct xe_exec_queue
 				   DMA_RESV_USAGE_KERNEL :
 				   DMA_RESV_USAGE_BOOKKEEP);
 
-		if (!xe_vma_has_no_bo(vma) && !xe_vma_bo(vma)->vm)
-			dma_resv_add_fence(xe_vma_bo(vma)->ttm.base.resv, fence,
+		if (!xe_vma_has_no_bo(vma) && !bo->vm)
+			dma_resv_add_fence(bo->ttm.base.resv, fence,
 					   DMA_RESV_USAGE_BOOKKEEP);
 		xe_pt_commit_bind(vma, entries, num_entries, rebind,
 				  bind_pt_update.locked ? &deferred : NULL);
-- 
2.25.1