drm/i915: Force ww lock for i915_gem_object_ggtt_pin_ww, v2.

We will need the lock to unbind the vma, and wait for bind to complete.
Remove the special casing for the !ww path, and force ww locking for all.

Changes since v1:
- Pass err to for_i915_gem_ww handling for -EDEADLK handling.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211216142749.1966107-6-maarten.lankhorst@linux.intel.com

drivers/gpu/drm/i915/i915_drv.h

@@ -1869,13 +1869,10 @@ i915_gem_object_ggtt_pin_ww(struct drm_i915_gem_object *obj,
 			    const struct i915_ggtt_view *view,
 			    u64 size, u64 alignment, u64 flags);
 
-static inline struct i915_vma * __must_check
+struct i915_vma * __must_check
 i915_gem_object_ggtt_pin(struct drm_i915_gem_object *obj,
 			 const struct i915_ggtt_view *view,
-			 u64 size, u64 alignment, u64 flags)
-{
-	return i915_gem_object_ggtt_pin_ww(obj, NULL, view, size, alignment, flags);
-}
+			 u64 size, u64 alignment, u64 flags);
 
 int i915_gem_object_unbind(struct drm_i915_gem_object *obj,
 			   unsigned long flags);

drivers/gpu/drm/i915/i915_gem.c

@@ -877,6 +877,8 @@ i915_gem_object_ggtt_pin_ww(struct drm_i915_gem_object *obj,
 	struct i915_vma *vma;
 	int ret;
 
+	GEM_WARN_ON(!ww);
+
 	if (flags & PIN_MAPPABLE &&
 	    (!view || view->type == I915_GGTT_VIEW_NORMAL)) {
 		/*
@@ -936,10 +938,7 @@ new_vma:
 			return ERR_PTR(ret);
 	}
 
-	if (ww)
-		ret = i915_vma_pin_ww(vma, ww, size, alignment, flags | PIN_GLOBAL);
-	else
-		ret = i915_vma_pin(vma, size, alignment, flags | PIN_GLOBAL);
+	ret = i915_vma_pin_ww(vma, ww, size, alignment, flags | PIN_GLOBAL);
 
 	if (ret)
 		return ERR_PTR(ret);
@@ -959,6 +958,29 @@ new_vma:
 	return vma;
 }
 
+struct i915_vma * __must_check
+i915_gem_object_ggtt_pin(struct drm_i915_gem_object *obj,
+			 const struct i915_ggtt_view *view,
+			 u64 size, u64 alignment, u64 flags)
+{
+	struct i915_gem_ww_ctx ww;
+	struct i915_vma *ret;
+	int err;
+
+	for_i915_gem_ww(&ww, err, true) {
+		err = i915_gem_object_lock(obj, &ww);
+		if (err)
+			continue;
+
+		ret = i915_gem_object_ggtt_pin_ww(obj, &ww, view, size,
+						  alignment, flags);
+		if (IS_ERR(ret))
+			err = PTR_ERR(ret);
+	}
+
+	return err ? ERR_PTR(err) : ret;
+}
+
 int
 i915_gem_madvise_ioctl(struct drm_device *dev, void *data,
 		       struct drm_file *file_priv)