drm: Check against color expansion in drm_mm_reserve_node()

Use the color_adjust callback when reserving a node to check if
inserting a node into this hole requires any additional space, and so if
that space then conflicts with an existing allocation.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: dri-devel@lists.freedesktop.org
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20161123141118.23876-2-chris@chris-wilson.co.uk

diff --git a/drivers/gpu/drm/drm_mm.c b/drivers/gpu/drm/drm_mm.c
index f8eebbde376e55fd81eb4e826e251f651dc03565..025dcd8cadcb632e73c88cf28786d25cf45ad161 100644 (file)
--- a/drivers/gpu/drm/drm_mm.c
+++ b/drivers/gpu/drm/drm_mm.c
@@ -306,6 +306,7 @@ int drm_mm_reserve_node(struct drm_mm *mm, struct drm_mm_node *node)
        u64 end = node->start + node->size;
        struct drm_mm_node *hole;
        u64 hole_start, hole_end;
+       u64 adj_start, adj_end;
 
        if (WARN_ON(node->size == 0))
                return -EINVAL;
@@ -327,9 +328,13 @@ int drm_mm_reserve_node(struct drm_mm *mm, struct drm_mm_node *node)
        if (!hole->hole_follows)
                return -ENOSPC;
 
-       hole_start = __drm_mm_hole_node_start(hole);
-       hole_end = __drm_mm_hole_node_end(hole);
-       if (hole_start > node->start || hole_end < end)
+       adj_start = hole_start = __drm_mm_hole_node_start(hole);
+       adj_end = hole_end = __drm_mm_hole_node_end(hole);
+
+       if (mm->color_adjust)
+               mm->color_adjust(hole, node->color, &adj_start, &adj_end);
+
+       if (adj_start > node->start || adj_end < end)
                return -ENOSPC;
 
        node->mm = mm;