drm/i915: Replace some open-coded i915_coherent_map_type()

A few callsites were deciding on using WC or WB maps based on
HAS_LLC(), so replace them with the equivalent helper function
i915_coherent_map_type().
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20181001194447.29910-1-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/intel_ringbuffer.c

@@ -1023,8 +1023,7 @@ i915_emit_bb_start(struct i915_request *rq,
 int intel_ring_pin(struct intel_ring *ring)
 {
 	struct i915_vma *vma = ring->vma;
-	enum i915_map_type map =
-		HAS_LLC(vma->vm->i915) ? I915_MAP_WB : I915_MAP_WC;
+	enum i915_map_type map = i915_coherent_map_type(vma->vm->i915);
 	unsigned int flags;
 	void *addr;
 	int ret;

drivers/gpu/drm/i915/selftests/intel_hangcheck.c

@@ -76,7 +76,7 @@ static int hang_init(struct hang *h, struct drm_i915_private *i915)
 	h->seqno = memset(vaddr, 0xff, PAGE_SIZE);
 
 	vaddr = i915_gem_object_pin_map(h->obj,
-					HAS_LLC(i915) ? I915_MAP_WB : I915_MAP_WC);
+					i915_coherent_map_type(i915));
 	if (IS_ERR(vaddr)) {
 		err = PTR_ERR(vaddr);
 		goto err_unpin_hws;
@@ -234,7 +234,7 @@ hang_create_request(struct hang *h, struct intel_engine_cs *engine)
 			return ERR_CAST(obj);
 
 		vaddr = i915_gem_object_pin_map(obj,
-						HAS_LLC(h->i915) ? I915_MAP_WB : I915_MAP_WC);
+						i915_coherent_map_type(h->i915));
 		if (IS_ERR(vaddr)) {
 			i915_gem_object_put(obj);
 			return ERR_CAST(vaddr);

drivers/gpu/drm/i915/selftests/intel_lrc.c

@@ -49,7 +49,7 @@ static int spinner_init(struct spinner *spin, struct drm_i915_private *i915)
 	}
 	spin->seqno = memset(vaddr, 0xff, PAGE_SIZE);
 
-	mode = HAS_LLC(i915) ? I915_MAP_WB : I915_MAP_WC;
+	mode = i915_coherent_map_type(i915);
 	vaddr = i915_gem_object_pin_map(spin->obj, mode);
 	if (IS_ERR(vaddr)) {
 		err = PTR_ERR(vaddr);