[PATCH 1/2] drm/ttm: add lru notify to bo driver

[Chunming Zhou]

allow driver do somethings when lru changed.

Change-Id: Ie82053da49272881d4b52b1c406f7c221a3fcadf
Signed-off-by: Chunming Zhou <david1.z...@amd.com>
---
 drivers/gpu/drm/ttm/ttm_bo.c    | 11 +++++++----
 include/drm/ttm/ttm_bo_driver.h |  9 +++++++++
 2 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index 0ec08394e17a..ed79ea0291b7 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -198,19 +198,22 @@ static void ttm_bo_ref_bug(struct kref *list_kref)
 
 void ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
 {
+       struct ttm_bo_device *bdev = bo->bdev;
+       bool notify = false;
+
        if (!list_empty(&bo->swap)) {
                list_del_init(&bo->swap);
                kref_put(&bo->list_kref, ttm_bo_ref_bug);
+               notify = true;
        }
        if (!list_empty(&bo->lru)) {
                list_del_init(&bo->lru);
                kref_put(&bo->list_kref, ttm_bo_ref_bug);
+               notify = true;
        }
 
-       /*
-        * TODO: Add a driver hook to delete from
-        * driver-specific LRU's here.
-        */
+       if (notify && bdev->driver->lru_notify)
+               bdev->driver->lru_notify(bo);
 }
 
 void ttm_bo_del_sub_from_lru(struct ttm_buffer_object *bo)
diff --git a/include/drm/ttm/ttm_bo_driver.h b/include/drm/ttm/ttm_bo_driver.h
index 1021106438b2..85a9b97e1c9d 100644
--- a/include/drm/ttm/ttm_bo_driver.h
+++ b/include/drm/ttm/ttm_bo_driver.h
@@ -381,6 +381,15 @@ struct ttm_bo_driver {
         */
        int (*access_memory)(struct ttm_buffer_object *bo, unsigned long offset,
                             void *buf, int len, int write);
+
+       /**
+        * struct ttm_bo_driver member lru_notify
+        *
+        * @bo: the buffer object to be add
+        *
+        * send lru changed event to driver.
+        */
+       void (*lru_notify)(struct ttm_buffer_object *bo);
 };
 
 /**
-- 
2.17.1

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