panfrost: Stub out panfrost_bo_cache_evict

This destructor will be used to legitimately free the BOs, now that a BO
free with cacheable=0 is only a "fake" free.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>

src/gallium/drivers/panfrost/pan_bo_cache.c

@@ -47,4 +47,17 @@ panfrost_bo_cache_put(
         return false;
 }
 
+/* Evicts all BOs from the cache. Called during context
+ * destroy or during low-memory situations (to free up
+ * memory that may be unused by us just sitting in our
+ * cache, but still reserved from the perspective of the
+ * OS) */
+
+void
+panfrost_bo_cache_evict_all(
+                struct panfrost_screen *screen)
+{
+        /* Stub */
+        return;
+}
 

src/gallium/drivers/panfrost/pan_screen.c

@@ -443,6 +443,7 @@ static void
 panfrost_destroy_screen(struct pipe_screen *pscreen)
 {
         struct panfrost_screen *screen = pan_screen(pscreen);
+        panfrost_bo_cache_evict_all(screen);
         ralloc_free(screen);
 }
 

src/gallium/drivers/panfrost/pan_screen.h

@@ -171,5 +171,8 @@ panfrost_bo_cache_put(
                 struct panfrost_screen *screen,
                 struct panfrost_bo *bo);
 
+void
+panfrost_bo_cache_evict_all(
+                struct panfrost_screen *screen);
 
 #endif /* PAN_SCREEN_H */