drm/i915: Mappable_end can't ever be > end

Both DRI1 and DRI2 can never specify a mappable size which goes past the
GTT size.  Don't pretend otherwise.

Reviewed-by: Rodrigo Vivi <rodrigo.vivi@gmail.com>
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 3ffcf52..e66c700 100644 (file)
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -536,6 +536,8 @@ void i915_gem_setup_global_gtt(struct drm_device *dev,
        struct drm_i915_gem_object *obj;
        unsigned long hole_start, hole_end;
 
+       BUG_ON(mappable_end > end);
+
        /* Subtract the guard page ... */
        drm_mm_init(&dev_priv->mm.gtt_space, start, end - start - PAGE_SIZE);
        if (!HAS_LLC(dev))
@@ -557,7 +559,7 @@ void i915_gem_setup_global_gtt(struct drm_device *dev,
        dev_priv->mm.gtt_start = start;
        dev_priv->mm.gtt_mappable_end = mappable_end;
        dev_priv->mm.gtt_total = end - start;
-       dev_priv->mm.mappable_gtt_total = min(end, mappable_end) - start;
+       dev_priv->mm.mappable_gtt_total = mappable_end - start;
 
        /* Clear any non-preallocated blocks */
        drm_mm_for_each_hole(entry, &dev_priv->mm.gtt_space,