drm/i915: Remove unused intel_ring_cacheline_align

The last use of intel_ring_cacheline_align() was removed in 2017 by
commit afa8ce5 ("drm/i915: Nuke legacy flip queueing code")

Remove it.

Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
Signed-off-by: Tvrtko Ursulin <tursulin@igalia.com>
Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com>
Signed-off-by: Andi Shyti <andi.shyti@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241227113754.25871-3-tursulin@igalia.com

Author: Dr. David Alan Gilbert

drivers/gpu/drm/i915/gt/intel_ring.c

@@ -308,30 +308,6 @@ u32 *intel_ring_begin(struct i915_request *rq, unsigned int num_dwords)
 	return cs;
 }
 
-/* Align the ring tail to a cacheline boundary */
-int intel_ring_cacheline_align(struct i915_request *rq)
-{
-	int num_dwords;
-	void *cs;
-
-	num_dwords = (rq->ring->emit & (CACHELINE_BYTES - 1)) / sizeof(u32);
-	if (num_dwords == 0)
-		return 0;
-
-	num_dwords = CACHELINE_DWORDS - num_dwords;
-	GEM_BUG_ON(num_dwords & 1);
-
-	cs = intel_ring_begin(rq, num_dwords);
-	if (IS_ERR(cs))
-		return PTR_ERR(cs);
-
-	memset64(cs, (u64)MI_NOOP << 32 | MI_NOOP, num_dwords / 2);
-	intel_ring_advance(rq, cs + num_dwords);
-
-	GEM_BUG_ON(rq->ring->emit & (CACHELINE_BYTES - 1));
-	return 0;
-}
-
 #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
 #include "selftest_ring.c"
 #endif

drivers/gpu/drm/i915/gt/intel_ring.h

@@ -16,7 +16,6 @@ struct intel_ring *
 intel_engine_create_ring(struct intel_engine_cs *engine, int size);
 
 u32 *intel_ring_begin(struct i915_request *rq, unsigned int num_dwords);
-int intel_ring_cacheline_align(struct i915_request *rq);
 
 unsigned int intel_ring_update_space(struct intel_ring *ring);