drm/i915/gem: Make i915_gem_object_flush_write_domain() static

flush_write_domain() is only used within the GEM domain management code,
so move it to i915_gem_domain.c and drop the export.

Signed-off-by: Chris Wilson <[e-mail]>
Reviewed-by: Matthew Auld <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/i915/gem/i915_gem_domain.c

···
  */
 
 #include "display/intel_frontbuffer.h"
+#include "gt/intel_gt.h"
 
 #include "i915_drv.h"
 #include "i915_gem_clflush.h"
···
 #include "i915_gem_lmem.h"
 #include "i915_gem_mman.h"
 
+static bool gpu_write_needs_clflush(struct drm_i915_gem_object *obj)
+{
+	return !(obj->cache_level == I915_CACHE_NONE ||
+		 obj->cache_level == I915_CACHE_WT);
+}
+
+static void
+flush_write_domain(struct drm_i915_gem_object *obj, unsigned int flush_domains)
+{
+	struct i915_vma *vma;
+
+	assert_object_held(obj);
+
+	if (!(obj->write_domain & flush_domains))
+		return;
+
+	switch (obj->write_domain) {
+	case I915_GEM_DOMAIN_GTT:
+		spin_lock(&obj->vma.lock);
+		for_each_ggtt_vma(vma, obj) {
+			if (i915_vma_unset_ggtt_write(vma))
+				intel_gt_flush_ggtt_writes(vma->vm->gt);
+		}
+		spin_unlock(&obj->vma.lock);
+
+		i915_gem_object_flush_frontbuffer(obj, ORIGIN_CPU);
+		break;
+
+	case I915_GEM_DOMAIN_WC:
+		wmb();
+		break;
+
+	case I915_GEM_DOMAIN_CPU:
+		i915_gem_clflush_object(obj, I915_CLFLUSH_SYNC);
+		break;
+
+	case I915_GEM_DOMAIN_RENDER:
+		if (gpu_write_needs_clflush(obj))
+			obj->cache_dirty = true;
+		break;
+	}
+
+	obj->write_domain = 0;
+}
+
 static void __i915_gem_object_flush_for_display(struct drm_i915_gem_object *obj)
 {
 	/*
 	 * We manually flush the CPU domain so that we can override and
 	 * force the flush for the display, and perform it asyncrhonously.
 	 */
-	i915_gem_object_flush_write_domain(obj, ~I915_GEM_DOMAIN_CPU);
+	flush_write_domain(obj, ~I915_GEM_DOMAIN_CPU);
 	if (obj->cache_dirty)
 		i915_gem_clflush_object(obj, I915_CLFLUSH_FORCE);
 	obj->write_domain = 0;
···
 	if (ret)
 		return ret;
 
-	i915_gem_object_flush_write_domain(obj, ~I915_GEM_DOMAIN_WC);
+	flush_write_domain(obj, ~I915_GEM_DOMAIN_WC);
 
 	/* Serialise direct access to this object with the barriers for
 	 * coherent writes from the GPU, by effectively invalidating the
···
 	if (ret)
 		return ret;
 
-	i915_gem_object_flush_write_domain(obj, ~I915_GEM_DOMAIN_GTT);
+	flush_write_domain(obj, ~I915_GEM_DOMAIN_GTT);
 
 	/* Serialise direct access to this object with the barriers for
 	 * coherent writes from the GPU, by effectively invalidating the
···
 	if (ret)
 		return ret;
 
-	i915_gem_object_flush_write_domain(obj, ~I915_GEM_DOMAIN_CPU);
+	flush_write_domain(obj, ~I915_GEM_DOMAIN_CPU);
 
 	/* Flush the CPU cache if it's still invalid. */
 	if ((obj->read_domains & I915_GEM_DOMAIN_CPU) == 0) {
···
 			goto out;
 	}
 
-	i915_gem_object_flush_write_domain(obj, ~I915_GEM_DOMAIN_CPU);
+	flush_write_domain(obj, ~I915_GEM_DOMAIN_CPU);
 
 	/* If we're not in the cpu read domain, set ourself into the gtt
 	 * read domain and manually flush cachelines (if required). This
···
 			goto out;
 	}
 
-	i915_gem_object_flush_write_domain(obj, ~I915_GEM_DOMAIN_CPU);
+	flush_write_domain(obj, ~I915_GEM_DOMAIN_CPU);
 
 	/* If we're not in the cpu write domain, set ourself into the
 	 * gtt write domain and manually flush cachelines (as required).

drivers/gpu/drm/i915/gem/i915_gem_object.c

···
 #include <linux/sched/mm.h>
 
 #include "display/intel_frontbuffer.h"
-#include "gt/intel_gt.h"
 #include "i915_drv.h"
 #include "i915_gem_clflush.h"
 #include "i915_gem_context.h"
···
 	 */
 	if (llist_add(&obj->freed, &i915->mm.free_list))
 		queue_work(i915->wq, &i915->mm.free_work);
-}
-
-static bool gpu_write_needs_clflush(struct drm_i915_gem_object *obj)
-{
-	return !(obj->cache_level == I915_CACHE_NONE ||
-		 obj->cache_level == I915_CACHE_WT);
-}
-
-void
-i915_gem_object_flush_write_domain(struct drm_i915_gem_object *obj,
-				   unsigned int flush_domains)
-{
-	struct i915_vma *vma;
-
-	assert_object_held(obj);
-
-	if (!(obj->write_domain & flush_domains))
-		return;
-
-	switch (obj->write_domain) {
-	case I915_GEM_DOMAIN_GTT:
-		spin_lock(&obj->vma.lock);
-		for_each_ggtt_vma(vma, obj) {
-			if (i915_vma_unset_ggtt_write(vma))
-				intel_gt_flush_ggtt_writes(vma->vm->gt);
-		}
-		spin_unlock(&obj->vma.lock);
-
-		i915_gem_object_flush_frontbuffer(obj, ORIGIN_CPU);
-		break;
-
-	case I915_GEM_DOMAIN_WC:
-		wmb();
-		break;
-
-	case I915_GEM_DOMAIN_CPU:
-		i915_gem_clflush_object(obj, I915_CLFLUSH_SYNC);
-		break;
-
-	case I915_GEM_DOMAIN_RENDER:
-		if (gpu_write_needs_clflush(obj))
-			obj->cache_dirty = true;
-		break;
-	}
-
-	obj->write_domain = 0;
 }
 
 void __i915_gem_object_flush_frontbuffer(struct drm_i915_gem_object *obj,

drivers/gpu/drm/i915/gem/i915_gem_object.h

···
 
 void __i915_gem_object_release_map(struct drm_i915_gem_object *obj);
 
-void
-i915_gem_object_flush_write_domain(struct drm_i915_gem_object *obj,
-				   unsigned int flush_domains);
-
 int i915_gem_object_prepare_read(struct drm_i915_gem_object *obj,
 				 unsigned int *needs_clflush);
 int i915_gem_object_prepare_write(struct drm_i915_gem_object *obj,