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>
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@ -1653,6 +1653,27 @@ int intel_ring_begin(struct intel_ring_buffer *ring,
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return 0;
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}
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/* Align the ring tail to a cacheline boundary */
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int intel_ring_cacheline_align(struct intel_ring_buffer *ring)
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{
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int num_dwords = (64 - (ring->tail & 63)) / sizeof(uint32_t);
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int ret;
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if (num_dwords == 0)
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return 0;
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ret = intel_ring_begin(ring, num_dwords);
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if (ret)
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return ret;
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while (num_dwords--)
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intel_ring_emit(ring, MI_NOOP);
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intel_ring_advance(ring);
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return 0;
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}
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void intel_ring_init_seqno(struct intel_ring_buffer *ring, u32 seqno)
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{
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struct drm_i915_private *dev_priv = ring->dev->dev_private;
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@ -233,6 +233,7 @@ intel_write_status_page(struct intel_ring_buffer *ring,
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void intel_cleanup_ring_buffer(struct intel_ring_buffer *ring);
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int __must_check intel_ring_begin(struct intel_ring_buffer *ring, int n);
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int __must_check intel_ring_cacheline_align(struct intel_ring_buffer *ring);
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static inline void intel_ring_emit(struct intel_ring_buffer *ring,
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u32 data)
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{
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