From d97ed3396399126cfca1e12e2b2e2d8bbc4924e5 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Wed, 4 Aug 2010 15:18:13 +0100 Subject: [PATCH] drm/i915: Move ringbuffer accounting to begin/advance. As we check that the ringbuffer will not wrap upon emission, we do not need to check that incrementing the tail wrapped every time. However, we do upon advancing just in case the tail is now pointing at the very end of the ring. Likewise we can account for the space used during emission in begin() and avoid decrementing it for every emit. Signed-off-by: Chris Wilson Signed-off-by: Eric Anholt --- drivers/gpu/drm/i915/intel_ringbuffer.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c index df8302a11eb5..7ab72af045ec 100644 --- a/drivers/gpu/drm/i915/intel_ringbuffer.c +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c @@ -731,6 +731,8 @@ void intel_ring_begin(struct drm_device *dev, intel_wrap_ring_buffer(dev, ring); if (unlikely(ring->space < n)) intel_wait_ring_buffer(dev, ring, n); + + ring->space -= n; } void intel_ring_emit(struct drm_device *dev, @@ -739,13 +741,12 @@ void intel_ring_emit(struct drm_device *dev, unsigned int *virt = ring->virtual_start + ring->tail; *virt = data; ring->tail += 4; - ring->tail &= ring->size - 1; - ring->space -= 4; } void intel_ring_advance(struct drm_device *dev, struct intel_ring_buffer *ring) { + ring->tail &= ring->size - 1; ring->advance_ring(dev, ring); }