[RFC PATCH 04/18] drm/ttm: Add driver funcs for uneviction control

[Friedrich Vock]

Provides fine-grained control for drivers over which buffers should be
considered when attempting to undo evictions.

Signed-off-by: Friedrich Vock <friedrich.vock at gmx.de>
---
 include/drm/ttm/ttm_device.h | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/include/drm/ttm/ttm_device.h b/include/drm/ttm/ttm_device.h
index baa264efe483d..283795d674189 100644
--- a/include/drm/ttm/ttm_device.h
+++ b/include/drm/ttm/ttm_device.h
@@ -133,6 +133,29 @@ struct ttm_device_funcs {
 	void (*evict_flags)(struct ttm_buffer_object *bo,
 			    struct ttm_placement *placement);

+	/**
+	 * struct ttm_bo_driver member uneviction_valuable
+	 *
+	 * @bo: the buffer object to be unevicted
+	 *
+	 * Check with the driver if it is valuable to unevict a BO,
+	 * that is to move it back to its placecment before it was
+	 * evicted.
+	 */
+	bool (*uneviction_valuable)(struct ttm_buffer_object *bo);
+	/**
+	 * struct ttm_bo_driver member evict_flags:
+	 *
+	 * @bo: the buffer object that can be unevicted
+	 * @dest: The placement for the unevicted buffer
+	 *
+	 * This should not cause multihop evictions, and the core will warn
+	 * if one is proposed.
+	 */
+
+	void (*unevict_flags)(struct ttm_buffer_object *bo,
+			      struct ttm_placement *dest);
+
 	/**
 	 * struct ttm_bo_driver member move:
 	 *
--
2.44.0