drm/ttm: simplify memory accounting for ttm user v2

Provide helper function to compute the kernel memory size needed
for each buffer object. Move all the accounting inside ttm, simplifying
driver and avoiding code duplication accross them.

v2 fix accounting of ghost object, one would have thought that i
   would have run into the issue since a longtime but it seems
   ghost object are rare when you have plenty of vram ;)

Signed-off-by: Jerome Glisse <jglisse@redhat.com>
Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.c b/drivers/gpu/drm/nouveau/nouveau_bo.c
index d6326af9fcc..7ac7bc3a8de 100644
--- a/drivers/gpu/drm/nouveau/nouveau_bo.c
+++ b/drivers/gpu/drm/nouveau/nouveau_bo.c
@@ -93,6 +93,7 @@ nouveau_bo_new(struct drm_device *dev, int size, int align,
 {
         struct drm_nouveau_private *dev_priv = dev->dev_private;
         struct nouveau_bo *nvbo;
+        size_t acc_size;
         int ret;
 
         nvbo = kzalloc(sizeof(struct nouveau_bo), GFP_KERNEL);
@@ -115,9 +116,12 @@ nouveau_bo_new(struct drm_device *dev, int size, int align,
         nvbo->bo.mem.num_pages = size >> PAGE_SHIFT;
         nouveau_bo_placement_set(nvbo, flags, 0);
 
+        acc_size = ttm_bo_dma_acc_size(&dev_priv->ttm.bdev, size,
+                                       sizeof(struct nouveau_bo));
+
         ret = ttm_bo_init(&dev_priv->ttm.bdev, &nvbo->bo, size,
                           ttm_bo_type_device, &nvbo->placement,
-                          align >> PAGE_SHIFT, 0, false, NULL, size,
+                          align >> PAGE_SHIFT, 0, false, NULL, acc_size,
                           nouveau_bo_del_ttm);
         if (ret) {
                 /* ttm will call nouveau_bo_del_ttm if it fails.. */