diff options
Diffstat (limited to 'sys/dev/pci/drm/i915/intel_ringbuffer.c')
| -rw-r--r-- | sys/dev/pci/drm/i915/intel_ringbuffer.c | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/sys/dev/pci/drm/i915/intel_ringbuffer.c b/sys/dev/pci/drm/i915/intel_ringbuffer.c index 7c70127ea44..57ab540dd18 100644 --- a/sys/dev/pci/drm/i915/intel_ringbuffer.c +++ b/sys/dev/pci/drm/i915/intel_ringbuffer.c @@ -1,4 +1,4 @@ -/* $OpenBSD: intel_ringbuffer.c,v 1.19 2014/03/24 17:06:49 kettenis Exp $ */ +/* $OpenBSD: intel_ringbuffer.c,v 1.20 2014/03/30 00:58:24 jsg Exp $ */ /* * Copyright © 2008-2010 Intel Corporation * @@ -1483,6 +1483,27 @@ int intel_ring_begin(struct intel_ring_buffer *ring, return 0; } +/* Align the ring tail to a cacheline boundary */ +int intel_ring_cacheline_align(struct intel_ring_buffer *ring) +{ + int num_dwords = (64 - (ring->tail & 63)) / sizeof(uint32_t); + int ret; + + if (num_dwords == 0) + return 0; + + ret = intel_ring_begin(ring, num_dwords); + if (ret) + return ret; + + while (num_dwords--) + intel_ring_emit(ring, MI_NOOP); + + intel_ring_advance(ring); + + return 0; +} + void intel_ring_advance(struct intel_ring_buffer *ring) { struct drm_i915_private *dev_priv = ring->dev->dev_private; |