drm/i915: split PIN_GLOBAL out from PIN_MAPPABLE

With abitrary pin flags it makes sense to split out a "please bind
this into global gtt" from the "please allocate in the mappable
range".

Use this unconditionally in our global gtt pin helper since this is
what its callers want. Later patches will drop PIN_MAPPABLE where it's
not strictly needed.
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_drv.h

@@ -2078,6 +2078,7 @@ void i915_gem_vma_destroy(struct i915_vma *vma);
 
 #define PIN_MAPPABLE 0x1
 #define PIN_NONBLOCK 0x2
+#define PIN_GLOBAL 0x4
 int __must_check i915_gem_object_pin(struct drm_i915_gem_object *obj,
 				     struct i915_address_space *vm,
 				     uint32_t alignment,
@@ -2286,7 +2287,7 @@ i915_gem_obj_ggtt_pin(struct drm_i915_gem_object *obj,
 		      uint32_t alignment,
 		      unsigned flags)
 {
-	return i915_gem_object_pin(obj, obj_to_ggtt(obj), alignment, flags);
+	return i915_gem_object_pin(obj, obj_to_ggtt(obj), alignment, flags | PIN_GLOBAL);
 }
 
 /* i915_gem_context.c */

drivers/gpu/drm/i915/i915_gem.c

@@ -3838,7 +3838,7 @@ i915_gem_object_pin(struct drm_i915_gem_object *obj,
 	struct i915_vma *vma;
 	int ret;
 
-	if (WARN_ON(flags & PIN_MAPPABLE && !i915_is_ggtt(vm)))
+	if (WARN_ON(flags & (PIN_GLOBAL | PIN_MAPPABLE) && !i915_is_ggtt(vm)))
 		return -EINVAL;
 
 	vma = i915_gem_obj_to_vma(obj, vm);
@@ -3872,7 +3872,7 @@ i915_gem_object_pin(struct drm_i915_gem_object *obj,
 	vma = i915_gem_obj_to_vma(obj, vm);
 
 	vma->bind_vma(vma, obj->cache_level,
-		      flags & PIN_MAPPABLE ? GLOBAL_BIND : 0);
+		      flags & PIN_GLOBAL ? GLOBAL_BIND : 0);
 
 	i915_gem_obj_to_vma(obj, vm)->pin_count++;
 	if (flags & PIN_MAPPABLE)

drivers/gpu/drm/i915/i915_gem_execbuffer.c

@@ -558,7 +558,7 @@ i915_gem_execbuffer_reserve_vma(struct i915_vma *vma,
 		flags |= PIN_MAPPABLE;
 
 	if (entry->flags & EXEC_OBJECT_NEEDS_GTT)
-		flags |= PIN_MAPPABLE;
+		flags |= PIN_GLOBAL;
 
 	ret = i915_gem_object_pin(obj, vma->vm, entry->alignment, flags);
 	if (ret)