[RFC PATCH 13/18] drm/ttm: Implement ttm_bo_update_priority

[Friedrich Vock]

Used to dynamically adjust priorities of buffers at runtime, to react to
changes in memory pressure/usage patterns.

Signed-off-by: Friedrich Vock <friedrich.vock at gmx.de>
---
 drivers/gpu/drm/ttm/ttm_bo.c | 17 +++++++++++++++++
 include/drm/ttm/ttm_bo.h     |  2 ++
 2 files changed, 19 insertions(+)

diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index eae54cd4a7ce9..6ac939c58a6b8 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -112,6 +112,23 @@ void ttm_bo_set_bulk_move(struct ttm_buffer_object *bo,
 }
 EXPORT_SYMBOL(ttm_bo_set_bulk_move);

+void ttm_bo_update_priority(struct ttm_buffer_object *bo, unsigned int new_prio)
+{
+	struct ttm_resource_manager *man;
+
+	if (!bo->resource)
+		return;
+
+	man = ttm_manager_type(bo->bdev, bo->resource->mem_type);
+
+	spin_lock(&bo->bdev->lru_lock);
+	ttm_resource_del_bulk_move(bo->resource, bo);
+	bo->priority = new_prio;
+	ttm_resource_add_bulk_move(bo->resource, bo);
+	spin_unlock(&bo->bdev->lru_lock);
+}
+EXPORT_SYMBOL(ttm_bo_update_priority);
+
 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
 				  struct ttm_resource *mem, bool evict,
 				  struct ttm_operation_ctx *ctx,
diff --git a/include/drm/ttm/ttm_bo.h b/include/drm/ttm/ttm_bo.h
index 91299a3b6fcfa..51040bc443ea0 100644
--- a/include/drm/ttm/ttm_bo.h
+++ b/include/drm/ttm/ttm_bo.h
@@ -359,6 +359,8 @@ static inline void *ttm_kmap_obj_virtual(struct ttm_bo_kmap_obj *map,
 	return map->virtual;
 }

+void ttm_bo_update_priority(struct ttm_buffer_object *bo,
+			    unsigned int new_prio);

 int ttm_bo_wait_ctx(struct ttm_buffer_object *bo,
 		    struct ttm_operation_ctx *ctx);
--
2.44.0