drm/ttm: introduce utility function to free an allocated memory node

Existing core code/drivers call drm_mm_put_block on ttm_mem_reg.mm_node
directly.  Future patches will modify TTM behaviour in such a way that
ttm_mem_reg.mm_node doesn't necessarily belong to drm_mm.

Reviewed-by: Jerome Glisse <jglisse@redhat.com>
Acked-by: Thomas Hellström <thellstrom@vmware.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

4 files changed, 20 insertions, 47 deletions

diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.c b/drivers/gpu/drm/nouveau/nouveau_bo.c
index 4e813638bdb..f685f392c22 100644
--- a/drivers/gpu/drm/nouveau/nouveau_bo.c
+++ b/drivers/gpu/drm/nouveau/nouveau_bo.c
@@ -693,12 +693,7 @@ nouveau_bo_move_flipd(struct ttm_buffer_object *bo, bool evict, bool intr,
 
         ret = ttm_bo_move_ttm(bo, evict, no_wait_reserve, no_wait_gpu, new_mem);
 out:
-        if (tmp_mem.mm_node) {
-                spin_lock(&bo->bdev->glob->lru_lock);
-                drm_mm_put_block(tmp_mem.mm_node);
-                spin_unlock(&bo->bdev->glob->lru_lock);
-        }
-
+        ttm_bo_mem_put(bo, &tmp_mem);
         return ret;
 }
 
@@ -731,12 +726,7 @@ nouveau_bo_move_flips(struct ttm_buffer_object *bo, bool evict, bool intr,
                 goto out;
 
 out:
-        if (tmp_mem.mm_node) {
-                spin_lock(&bo->bdev->glob->lru_lock);
-                drm_mm_put_block(tmp_mem.mm_node);
-                spin_unlock(&bo->bdev->glob->lru_lock);
-        }
-
+        ttm_bo_mem_put(bo, &tmp_mem);
         return ret;
 }
 
diff --git a/drivers/gpu/drm/radeon/radeon_ttm.c b/drivers/gpu/drm/radeon/radeon_ttm.c
index 84c53e41a88..cc19aba9bb7 100644
--- a/drivers/gpu/drm/radeon/radeon_ttm.c
+++ b/drivers/gpu/drm/radeon/radeon_ttm.c
@@ -326,14 +326,7 @@ static int radeon_move_vram_ram(struct ttm_buffer_object *bo,
         }
         r = ttm_bo_move_ttm(bo, true, no_wait_reserve, no_wait_gpu, new_mem);
 out_cleanup:
-        if (tmp_mem.mm_node) {
-                struct ttm_bo_global *glob = rdev->mman.bdev.glob;
-
-                spin_lock(&glob->lru_lock);
-                drm_mm_put_block(tmp_mem.mm_node);
-                spin_unlock(&glob->lru_lock);
-                return r;
-        }
+        ttm_bo_mem_put(bo, &tmp_mem);
         return r;
 }
 
@@ -372,14 +365,7 @@ static int radeon_move_ram_vram(struct ttm_buffer_object *bo,
                 goto out_cleanup;
         }
 out_cleanup:
-        if (tmp_mem.mm_node) {
-                struct ttm_bo_global *glob = rdev->mman.bdev.glob;
-
-                spin_lock(&glob->lru_lock);
-                drm_mm_put_block(tmp_mem.mm_node);
-                spin_unlock(&glob->lru_lock);
-                return r;
-        }
+        ttm_bo_mem_put(bo, &tmp_mem);
         return r;
 }
 
diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index cb4cf7ef4d1..80d37b460a8 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -475,11 +475,8 @@ static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo, bool remove_all)
                         list_del_init(&bo->ddestroy);
                         ++put_count;
                 }
-                if (bo->mem.mm_node) {
-                        drm_mm_put_block(bo->mem.mm_node);
-                        bo->mem.mm_node = NULL;
-                }
                 spin_unlock(&glob->lru_lock);
+                ttm_bo_mem_put(bo, &bo->mem);
 
                 atomic_set(&bo->reserved, 0);
 
@@ -621,7 +618,6 @@ static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
                         bool no_wait_reserve, bool no_wait_gpu)
 {
         struct ttm_bo_device *bdev = bo->bdev;
-        struct ttm_bo_global *glob = bo->glob;
         struct ttm_mem_reg evict_mem;
         struct ttm_placement placement;
         int ret = 0;
@@ -667,12 +663,7 @@ static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
         if (ret) {
                 if (ret != -ERESTARTSYS)
                         printk(KERN_ERR TTM_PFX "Buffer eviction failed\n");
-                spin_lock(&glob->lru_lock);
-                if (evict_mem.mm_node) {
-                        drm_mm_put_block(evict_mem.mm_node);
-                        evict_mem.mm_node = NULL;
-                }
-                spin_unlock(&glob->lru_lock);
+                ttm_bo_mem_put(bo, &evict_mem);
                 goto out;
         }
         bo->evicted = true;
@@ -769,6 +760,19 @@ static int ttm_bo_man_get_node(struct ttm_buffer_object *bo,
         return 0;
 }
 
+void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
+{
+        struct ttm_bo_global *glob = bo->glob;
+
+        if (mem->mm_node) {
+                spin_lock(&glob->lru_lock);
+                drm_mm_put_block(mem->mm_node);
+                spin_unlock(&glob->lru_lock);
+                mem->mm_node = NULL;
+        }
+}
+EXPORT_SYMBOL(ttm_bo_mem_put);
+
 /**
  * Repeatedly evict memory from the LRU for @mem_type until we create enough
  * space, or we've evicted everything and there isn't enough space.
diff --git a/drivers/gpu/drm/ttm/ttm_bo_util.c b/drivers/gpu/drm/ttm/ttm_bo_util.c
index 7cffb3e0423..0ebfe0d9493 100644
--- a/drivers/gpu/drm/ttm/ttm_bo_util.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_util.c
@@ -39,14 +39,7 @@
 
 void ttm_bo_free_old_node(struct ttm_buffer_object *bo)
 {
-        struct ttm_mem_reg *old_mem = &bo->mem;
-
-        if (old_mem->mm_node) {
-                spin_lock(&bo->glob->lru_lock);
-                drm_mm_put_block(old_mem->mm_node);
-                spin_unlock(&bo->glob->lru_lock);
-        }
-        old_mem->mm_node = NULL;
+        ttm_bo_mem_put(bo, &bo->mem);
 }
 
 int ttm_bo_move_ttm(struct ttm_buffer_object *bo,