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Commit 8fe301ad authored by Chris Wilson's avatar Chris Wilson Committed by Daniel Vetter
Browse files

drm/i915: Simplify fence finding 



As the fences are stored in LRU order, we can simply reuse the oldest if
we do not have an unused register.

Signed-off-by: default avatarChris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
parent 1c293ea3

drivers/gpu/drm/i915/i915_gem.c

+3 −13
Original line number Diff line number Diff line
@@ -2352,7 +2352,7 @@ static struct drm_i915_fence_reg * 
i915_find_fence_reg(struct drm_device *dev)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	struct drm_i915_fence_reg *reg, *first, *avail;

	struct drm_i915_fence_reg *reg, *avail;

	int i;



	/* First try to find a free reg */
@@ -2370,24 +2370,14 @@ i915_find_fence_reg(struct drm_device *dev) 
		return NULL;



	/* None available, try to steal one or wait for a user to finish */

	avail = first = NULL;

	list_for_each_entry(reg, &dev_priv->mm.fence_list, lru_list) {

		if (reg->pin_count)

			continue;



		if (first == NULL)

			first = reg;



		if (reg->obj->last_fenced_seqno == 0) {

			avail = reg;

			break;

		}

		return reg;

	}



	if (avail == NULL)

		avail = first;



	return avail;

	return NULL;

}



/**