diff options
| author | Ville Syrjälä | 2014-02-11 18:52:05 +0100 |
|---|---|---|
| committer | Daniel Vetter | 2014-02-11 23:00:19 +0100 |
| commit | 753b1ad4a281b0663329409d410243e91825c323 (patch) | |
| tree | d36cdd092349b4b27fbb77e7d09c097e9ff5bd25 /drivers/gpu/drm/i915/intel_ringbuffer.c | |
| parent | drm/i915: Pair va_copy with va_end in i915_error_vprintf (diff) | |
| download | kernel-qcow2-linux-753b1ad4a281b0663329409d410243e91825c323.tar.gz kernel-qcow2-linux-753b1ad4a281b0663329409d410243e91825c323.tar.xz kernel-qcow2-linux-753b1ad4a281b0663329409d410243e91825c323.zip | |
drm/i915: Add intel_ring_cachline_align()
intel_ring_cachline_align() emits MI_NOOPs until the ring tail is
aligned to a cacheline boundary.
Cc: Bjoern C <lkml@call-home.ch>
Cc: Alexandru DAMIAN <alexandru.damian@intel.com>
Cc: Enrico Tagliavini <enrico.tagliavini@gmail.com>
Suggested-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: stable@vger.kernel.org (prereq for the next patch)
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'drivers/gpu/drm/i915/intel_ringbuffer.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_ringbuffer.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c index b7f1742caf87..31b36c5ac894 100644 --- a/drivers/gpu/drm/i915/intel_ringbuffer.c +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c @@ -1653,6 +1653,27 @@ 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_init_seqno(struct intel_ring_buffer *ring, u32 seqno) { struct drm_i915_private *dev_priv = ring->dev->dev_private; |