drm/i915/display: handle migration for dpt

On platforms like DG2, it looks like the dpt path here is missing the
migrate-to-lmem step on discrete platforms.

v2:
  - Move the vma_pin() under the for_i915_gem_ww(), otherwise the
    object can be moved after dropping the lock and then doing the pin.

Fixes: 33e7a97 ("drm/i915/xelpd: First stab at DPT support")
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Jianshui Yu <jianshui.yu@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Nirmoy Das <nirmoy.das@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221004131916.233474-2-matthew.auld@intel.com

drivers/gpu/drm/i915/display/intel_fb_pin.c

@@ -26,40 +26,55 @@ intel_pin_fb_obj_dpt(struct drm_framebuffer *fb,
 	struct drm_device *dev = fb->dev;
 	struct drm_i915_private *dev_priv = to_i915(dev);
 	struct drm_i915_gem_object *obj = intel_fb_obj(fb);
+	struct i915_gem_ww_ctx ww;
 	struct i915_vma *vma;
 	u32 alignment;
 	int ret;
 
+	/*
+	 * We are not syncing against the binding (and potential migrations)
+	 * below, so this vm must never be async.
+	 */
+	GEM_WARN_ON(vm->bind_async_flags);
+
 	if (WARN_ON(!i915_gem_object_is_framebuffer(obj)))
 		return ERR_PTR(-EINVAL);
 
 	alignment = 4096 * 512;
 
 	atomic_inc(&dev_priv->gpu_error.pending_fb_pin);
 
-	ret = i915_gem_object_lock_interruptible(obj, NULL);
-	if (!ret) {
+	for_i915_gem_ww(&ww, ret, true) {
+		ret = i915_gem_object_lock(obj, &ww);
+		if (ret)
+			continue;
+
+		if (HAS_LMEM(dev_priv)) {
+			ret = i915_gem_object_migrate(obj, &ww, INTEL_REGION_LMEM_0);
+			if (ret)
+				continue;
+		}
+
 		ret = i915_gem_object_set_cache_level(obj, I915_CACHE_NONE);
-		i915_gem_object_unlock(obj);
-	}
-	if (ret) {
-		vma = ERR_PTR(ret);
-		goto err;
-	}
+		if (ret)
+			continue;
 
-	vma = i915_vma_instance(obj, vm, view);
-	if (IS_ERR(vma))
-		goto err;
+		vma = i915_vma_instance(obj, vm, view);
+		if (IS_ERR(vma)) {
+			ret = PTR_ERR(vma);
+			continue;
+		}
 
-	if (i915_vma_misplaced(vma, 0, alignment, 0)) {
-		ret = i915_vma_unbind_unlocked(vma);
-		if (ret) {
-			vma = ERR_PTR(ret);
-			goto err;
+		if (i915_vma_misplaced(vma, 0, alignment, 0)) {
+			ret = i915_vma_unbind(vma);
+			if (ret)
+				continue;
 		}
-	}
 
-	ret = i915_vma_pin(vma, 0, alignment, PIN_GLOBAL);
+		ret = i915_vma_pin_ww(vma, &ww, 0, alignment, PIN_GLOBAL);
+		if (ret)
+			continue;
+	}
 	if (ret) {
 		vma = ERR_PTR(ret);
 		goto err;