Linux-libre 4.2-gnu

1 files changed, 500 insertions, 152 deletions

diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 800a025dd..fed748311 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -352,7 +352,9 @@ static struct drm_mode_object *_object_find(struct drm_device *dev,
 	if (obj && obj->id != id)
 		obj = NULL;
 	/* don't leak out unref'd fb's */
-	if (obj && (obj->type == DRM_MODE_OBJECT_FB))
+	if (obj &&
+	    (obj->type == DRM_MODE_OBJECT_FB ||
+	     obj->type == DRM_MODE_OBJECT_BLOB))
 		obj = NULL;
 	mutex_unlock(&dev->mode_config.idr_mutex);
 
@@ -377,7 +379,7 @@ struct drm_mode_object *drm_mode_object_find(struct drm_device *dev,
 
 	/* Framebuffers are reference counted and need their own lookup
 	 * function.*/
-	WARN_ON(type == DRM_MODE_OBJECT_FB);
+	WARN_ON(type == DRM_MODE_OBJECT_FB || type == DRM_MODE_OBJECT_BLOB);
 	obj = _object_find(dev, id, type);
 	return obj;
 }
@@ -686,6 +688,7 @@ int drm_crtc_init_with_planes(struct drm_device *dev, struct drm_crtc *crtc,
 
 	if (drm_core_check_feature(dev, DRIVER_ATOMIC)) {
 		drm_object_attach_property(&crtc->base, config->prop_active, 0);
+		drm_object_attach_property(&crtc->base, config->prop_mode_id, 0);
 	}
 
 	return 0;
@@ -1289,6 +1292,29 @@ unsigned int drm_plane_index(struct drm_plane *plane)
 EXPORT_SYMBOL(drm_plane_index);
 
 /**
+ * drm_plane_from_index - find the registered plane at an index
+ * @dev: DRM device
+ * @idx: index of registered plane to find for
+ *
+ * Given a plane index, return the registered plane from DRM device's
+ * list of planes with matching index.
+ */
+struct drm_plane *
+drm_plane_from_index(struct drm_device *dev, int idx)
+{
+	struct drm_plane *plane;
+	unsigned int i = 0;
+
+	list_for_each_entry(plane, &dev->mode_config.plane_list, head) {
+		if (i == idx)
+			return plane;
+		i++;
+	}
+	return NULL;
+}
+EXPORT_SYMBOL(drm_plane_from_index);
+
+/**
  * drm_plane_force_disable - Forcibly disable a plane
  * @plane: plane to disable
  *
@@ -1429,6 +1455,13 @@ static int drm_mode_create_standard_properties(struct drm_device *dev)
 		return -ENOMEM;
 	dev->mode_config.prop_active = prop;
 
+	prop = drm_property_create(dev,
+			DRM_MODE_PROP_ATOMIC | DRM_MODE_PROP_BLOB,
+			"MODE_ID", 0);
+	if (!prop)
+		return -ENOMEM;
+	dev->mode_config.prop_mode_id = prop;
+
 	return 0;
 }
 
@@ -1711,82 +1744,6 @@ void drm_reinit_primary_mode_group(struct drm_device *dev)
 EXPORT_SYMBOL(drm_reinit_primary_mode_group);
 
 /**
- * drm_crtc_convert_to_umode - convert a drm_display_mode into a modeinfo
- * @out: drm_mode_modeinfo struct to return to the user
- * @in: drm_display_mode to use
- *
- * Convert a drm_display_mode into a drm_mode_modeinfo structure to return to
- * the user.
- */
-static void drm_crtc_convert_to_umode(struct drm_mode_modeinfo *out,
-				      const struct drm_display_mode *in)
-{
-	WARN(in->hdisplay > USHRT_MAX || in->hsync_start > USHRT_MAX ||
-	     in->hsync_end > USHRT_MAX || in->htotal > USHRT_MAX ||
-	     in->hskew > USHRT_MAX || in->vdisplay > USHRT_MAX ||
-	     in->vsync_start > USHRT_MAX || in->vsync_end > USHRT_MAX ||
-	     in->vtotal > USHRT_MAX || in->vscan > USHRT_MAX,
-	     "timing values too large for mode info\n");
-
-	out->clock = in->clock;
-	out->hdisplay = in->hdisplay;
-	out->hsync_start = in->hsync_start;
-	out->hsync_end = in->hsync_end;
-	out->htotal = in->htotal;
-	out->hskew = in->hskew;
-	out->vdisplay = in->vdisplay;
-	out->vsync_start = in->vsync_start;
-	out->vsync_end = in->vsync_end;
-	out->vtotal = in->vtotal;
-	out->vscan = in->vscan;
-	out->vrefresh = in->vrefresh;
-	out->flags = in->flags;
-	out->type = in->type;
-	strncpy(out->name, in->name, DRM_DISPLAY_MODE_LEN);
-	out->name[DRM_DISPLAY_MODE_LEN-1] = 0;
-}
-
-/**
- * drm_crtc_convert_umode - convert a modeinfo into a drm_display_mode
- * @out: drm_display_mode to return to the user
- * @in: drm_mode_modeinfo to use
- *
- * Convert a drm_mode_modeinfo into a drm_display_mode structure to return to
- * the caller.
- *
- * Returns:
- * Zero on success, negative errno on failure.
- */
-static int drm_crtc_convert_umode(struct drm_display_mode *out,
-				  const struct drm_mode_modeinfo *in)
-{
-	if (in->clock > INT_MAX || in->vrefresh > INT_MAX)
-		return -ERANGE;
-
-	if ((in->flags & DRM_MODE_FLAG_3D_MASK) > DRM_MODE_FLAG_3D_MAX)
-		return -EINVAL;
-
-	out->clock = in->clock;
-	out->hdisplay = in->hdisplay;
-	out->hsync_start = in->hsync_start;
-	out->hsync_end = in->hsync_end;
-	out->htotal = in->htotal;
-	out->hskew = in->hskew;
-	out->vdisplay = in->vdisplay;
-	out->vsync_start = in->vsync_start;
-	out->vsync_end = in->vsync_end;
-	out->vtotal = in->vtotal;
-	out->vscan = in->vscan;
-	out->vrefresh = in->vrefresh;
-	out->flags = in->flags;
-	out->type = in->type;
-	strncpy(out->name, in->name, DRM_DISPLAY_MODE_LEN);
-	out->name[DRM_DISPLAY_MODE_LEN-1] = 0;
-
-	return 0;
-}
-
-/**
  * drm_mode_getresources - get graphics configuration
  * @dev: drm device for the ioctl
  * @data: data pointer for the ioctl
@@ -2012,7 +1969,7 @@ int drm_mode_getcrtc(struct drm_device *dev,
 		crtc_resp->x = crtc->primary->state->src_x >> 16;
 		crtc_resp->y = crtc->primary->state->src_y >> 16;
 		if (crtc->state->enable) {
-			drm_crtc_convert_to_umode(&crtc_resp->mode, &crtc->state->mode);
+			drm_mode_convert_to_umode(&crtc_resp->mode, &crtc->state->mode);
 			crtc_resp->mode_valid = 1;
 
 		} else {
@@ -2022,7 +1979,7 @@ int drm_mode_getcrtc(struct drm_device *dev,
 		crtc_resp->x = crtc->x;
 		crtc_resp->y = crtc->y;
 		if (crtc->enabled) {
-			drm_crtc_convert_to_umode(&crtc_resp->mode, &crtc->mode);
+			drm_mode_convert_to_umode(&crtc_resp->mode, &crtc->mode);
 			crtc_resp->mode_valid = 1;
 
 		} else {
@@ -2179,7 +2136,7 @@ int drm_mode_getconnector(struct drm_device *dev, void *data,
 			if (!drm_mode_expose_to_userspace(mode, file_priv))
 				continue;
 
-			drm_crtc_convert_to_umode(&u_mode, mode);
+			drm_mode_convert_to_umode(&u_mode, mode);
 			if (copy_to_user(mode_ptr + copied,
 					 &u_mode, sizeof(u_mode))) {
 				ret = -EFAULT;
@@ -2793,18 +2750,12 @@ int drm_mode_setcrtc(struct drm_device *dev, void *data,
 			goto out;
 		}
 
-		ret = drm_crtc_convert_umode(mode, &crtc_req->mode);
+		ret = drm_mode_convert_umode(mode, &crtc_req->mode);
 		if (ret) {
 			DRM_DEBUG_KMS("Invalid mode\n");
 			goto out;
 		}
 
-		mode->status = drm_mode_validate_basic(mode);
-		if (mode->status != MODE_OK) {
-			ret = -EINVAL;
-			goto out;
-		}
-
 		drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
 
 		/*
@@ -3307,6 +3258,50 @@ static int framebuffer_check(const struct drm_mode_fb_cmd2 *r)
 				      r->modifier[i], i);
 			return -EINVAL;
 		}
+
+		/* modifier specific checks: */
+		switch (r->modifier[i]) {
+		case DRM_FORMAT_MOD_SAMSUNG_64_32_TILE:
+			/* NOTE: the pitch restriction may be lifted later if it turns
+			 * out that no hw has this restriction:
+			 */
+			if (r->pixel_format != DRM_FORMAT_NV12 ||
+					width % 128 || height % 32 ||
+					r->pitches[i] % 128) {
+				DRM_DEBUG_KMS("bad modifier data for plane %d\n", i);
+				return -EINVAL;
+			}
+			break;
+
+		default:
+			break;
+		}
+	}
+
+	for (i = num_planes; i < 4; i++) {
+		if (r->modifier[i]) {
+			DRM_DEBUG_KMS("non-zero modifier for unused plane %d\n", i);
+			return -EINVAL;
+		}
+
+		/* Pre-FB_MODIFIERS userspace didn't clear the structs properly. */
+		if (!(r->flags & DRM_MODE_FB_MODIFIERS))
+			continue;
+
+		if (r->handles[i]) {
+			DRM_DEBUG_KMS("buffer object handle for unused plane %d\n", i);
+			return -EINVAL;
+		}
+
+		if (r->pitches[i]) {
+			DRM_DEBUG_KMS("non-zero pitch for unused plane %d\n", i);
+			return -EINVAL;
+		}
+
+		if (r->offsets[i]) {
+			DRM_DEBUG_KMS("non-zero offset for unused plane %d\n", i);
+			return -EINVAL;
+		}
 	}
 
 	return 0;
@@ -4205,43 +4200,291 @@ done:
 	return ret;
 }
 
-static struct drm_property_blob *
+/**
+ * drm_property_create_blob - Create new blob property
+ *
+ * Creates a new blob property for a specified DRM device, optionally
+ * copying data.
+ *
+ * @dev: DRM device to create property for
+ * @length: Length to allocate for blob data
+ * @data: If specified, copies data into blob
+ *
+ * Returns:
+ * New blob property with a single reference on success, or an ERR_PTR
+ * value on failure.
+ */
+struct drm_property_blob *
 drm_property_create_blob(struct drm_device *dev, size_t length,
 			 const void *data)
 {
 	struct drm_property_blob *blob;
 	int ret;
 
-	if (!length || !data)
-		return NULL;
+	if (!length)
+		return ERR_PTR(-EINVAL);
 
 	blob = kzalloc(sizeof(struct drm_property_blob)+length, GFP_KERNEL);
 	if (!blob)
-		return NULL;
+		return ERR_PTR(-ENOMEM);
+
+	/* This must be explicitly initialised, so we can safely call list_del
+	 * on it in the removal handler, even if it isn't in a file list. */
+	INIT_LIST_HEAD(&blob->head_file);
+	blob->length = length;
+	blob->dev = dev;
+
+	if (data)
+		memcpy(blob->data, data, length);
+
+	mutex_lock(&dev->mode_config.blob_lock);
 
 	ret = drm_mode_object_get(dev, &blob->base, DRM_MODE_OBJECT_BLOB);
 	if (ret) {
 		kfree(blob);
-		return NULL;
+		mutex_unlock(&dev->mode_config.blob_lock);
+		return ERR_PTR(-EINVAL);
 	}
 
-	blob->length = length;
+	kref_init(&blob->refcount);
 
-	memcpy(blob->data, data, length);
+	list_add_tail(&blob->head_global,
+	              &dev->mode_config.property_blob_list);
+
+	mutex_unlock(&dev->mode_config.blob_lock);
 
-	list_add_tail(&blob->head, &dev->mode_config.property_blob_list);
 	return blob;
 }
+EXPORT_SYMBOL(drm_property_create_blob);
 
-static void drm_property_destroy_blob(struct drm_device *dev,
-			       struct drm_property_blob *blob)
+/**
+ * drm_property_free_blob - Blob property destructor
+ *
+ * Internal free function for blob properties; must not be used directly.
+ *
+ * @kref: Reference
+ */
+static void drm_property_free_blob(struct kref *kref)
 {
-	drm_mode_object_put(dev, &blob->base);
-	list_del(&blob->head);
+	struct drm_property_blob *blob =
+		container_of(kref, struct drm_property_blob, refcount);
+
+	WARN_ON(!mutex_is_locked(&blob->dev->mode_config.blob_lock));
+
+	list_del(&blob->head_global);
+	list_del(&blob->head_file);
+	drm_mode_object_put(blob->dev, &blob->base);
+
 	kfree(blob);
 }
 
 /**
+ * drm_property_unreference_blob - Unreference a blob property
+ *
+ * Drop a reference on a blob property. May free the object.
+ *
+ * @blob: Pointer to blob property
+ */
+void drm_property_unreference_blob(struct drm_property_blob *blob)
+{
+	struct drm_device *dev;
+
+	if (!blob)
+		return;
+
+	dev = blob->dev;
+
+	DRM_DEBUG("%p: blob ID: %d (%d)\n", blob, blob->base.id, atomic_read(&blob->refcount.refcount));
+
+	if (kref_put_mutex(&blob->refcount, drm_property_free_blob,
+			   &dev->mode_config.blob_lock))
+		mutex_unlock(&dev->mode_config.blob_lock);
+	else
+		might_lock(&dev->mode_config.blob_lock);
+
+}
+EXPORT_SYMBOL(drm_property_unreference_blob);
+
+/**
+ * drm_property_unreference_blob_locked - Unreference a blob property with blob_lock held
+ *
+ * Drop a reference on a blob property. May free the object. This must be
+ * called with blob_lock held.
+ *
+ * @blob: Pointer to blob property
+ */
+static void drm_property_unreference_blob_locked(struct drm_property_blob *blob)
+{
+	if (!blob)
+		return;
+
+	DRM_DEBUG("%p: blob ID: %d (%d)\n", blob, blob->base.id, atomic_read(&blob->refcount.refcount));
+
+	kref_put(&blob->refcount, drm_property_free_blob);
+}
+
+/**
+ * drm_property_destroy_user_blobs - destroy all blobs created by this client
+ * @dev:       DRM device
+ * @file_priv: destroy all blobs owned by this file handle
+ */
+void drm_property_destroy_user_blobs(struct drm_device *dev,
+				     struct drm_file *file_priv)
+{
+	struct drm_property_blob *blob, *bt;
+
+	mutex_lock(&dev->mode_config.blob_lock);
+
+	list_for_each_entry_safe(blob, bt, &file_priv->blobs, head_file) {
+		list_del_init(&blob->head_file);
+		drm_property_unreference_blob_locked(blob);
+	}
+
+	mutex_unlock(&dev->mode_config.blob_lock);
+}
+
+/**
+ * drm_property_reference_blob - Take a reference on an existing property
+ *
+ * Take a new reference on an existing blob property.
+ *
+ * @blob: Pointer to blob property
+ */
+struct drm_property_blob *drm_property_reference_blob(struct drm_property_blob *blob)
+{
+	DRM_DEBUG("%p: blob ID: %d (%d)\n", blob, blob->base.id, atomic_read(&blob->refcount.refcount));
+	kref_get(&blob->refcount);
+	return blob;
+}
+EXPORT_SYMBOL(drm_property_reference_blob);
+
+/*
+ * Like drm_property_lookup_blob, but does not return an additional reference.
+ * Must be called with blob_lock held.
+ */
+static struct drm_property_blob *__drm_property_lookup_blob(struct drm_device *dev,
+							    uint32_t id)
+{
+	struct drm_mode_object *obj = NULL;
+	struct drm_property_blob *blob;
+
+	WARN_ON(!mutex_is_locked(&dev->mode_config.blob_lock));
+
+	mutex_lock(&dev->mode_config.idr_mutex);
+	obj = idr_find(&dev->mode_config.crtc_idr, id);
+	if (!obj || (obj->type != DRM_MODE_OBJECT_BLOB) || (obj->id != id))
+		blob = NULL;
+	else
+		blob = obj_to_blob(obj);
+	mutex_unlock(&dev->mode_config.idr_mutex);
+
+	return blob;
+}
+
+/**
+ * drm_property_lookup_blob - look up a blob property and take a reference
+ * @dev: drm device
+ * @id: id of the blob property
+ *
+ * If successful, this takes an additional reference to the blob property.
+ * callers need to make sure to eventually unreference the returned property
+ * again, using @drm_property_unreference_blob.
+ */
+struct drm_property_blob *drm_property_lookup_blob(struct drm_device *dev,
+					           uint32_t id)
+{
+	struct drm_property_blob *blob;
+
+	mutex_lock(&dev->mode_config.blob_lock);
+	blob = __drm_property_lookup_blob(dev, id);
+	if (blob) {
+		if (!kref_get_unless_zero(&blob->refcount))
+			blob = NULL;
+	}
+	mutex_unlock(&dev->mode_config.blob_lock);
+
+	return blob;
+}
+EXPORT_SYMBOL(drm_property_lookup_blob);
+
+/**
+ * drm_property_replace_global_blob - atomically replace existing blob property
+ * @dev: drm device
+ * @replace: location of blob property pointer to be replaced
+ * @length: length of data for new blob, or 0 for no data
+ * @data: content for new blob, or NULL for no data
+ * @obj_holds_id: optional object for property holding blob ID
+ * @prop_holds_id: optional property holding blob ID
+ * @return 0 on success or error on failure
+ *
+ * This function will atomically replace a global property in the blob list,
+ * optionally updating a property which holds the ID of that property. It is
+ * guaranteed to be atomic: no caller will be allowed to see intermediate
+ * results, and either the entire operation will succeed and clean up the
+ * previous property, or it will fail and the state will be unchanged.
+ *
+ * If length is 0 or data is NULL, no new blob will be created, and the holding
+ * property, if specified, will be set to 0.
+ *
+ * Access to the replace pointer is assumed to be protected by the caller, e.g.
+ * by holding the relevant modesetting object lock for its parent.
+ *
+ * For example, a drm_connector has a 'PATH' property, which contains the ID
+ * of a blob property with the value of the MST path information. Calling this
+ * function with replace pointing to the connector's path_blob_ptr, length and
+ * data set for the new path information, obj_holds_id set to the connector's
+ * base object, and prop_holds_id set to the path property name, will perform
+ * a completely atomic update. The access to path_blob_ptr is protected by the
+ * caller holding a lock on the connector.
+ */
+static int drm_property_replace_global_blob(struct drm_device *dev,
+                                            struct drm_property_blob **replace,
+                                            size_t length,
+                                            const void *data,
+                                            struct drm_mode_object *obj_holds_id,
+                                            struct drm_property *prop_holds_id)
+{
+	struct drm_property_blob *new_blob = NULL;
+	struct drm_property_blob *old_blob = NULL;
+	int ret;
+
+	WARN_ON(replace == NULL);
+
+	old_blob = *replace;
+
+	if (length && data) {
+		new_blob = drm_property_create_blob(dev, length, data);
+		if (IS_ERR(new_blob))
+			return PTR_ERR(new_blob);
+	}
+
+	/* This does not need to be synchronised with blob_lock, as the
+	 * get_properties ioctl locks all modesetting objects, and
+	 * obj_holds_id must be locked before calling here, so we cannot
+	 * have its value out of sync with the list membership modified
+	 * below under blob_lock. */
+	if (obj_holds_id) {
+		ret = drm_object_property_set_value(obj_holds_id,
+						    prop_holds_id,
+						    new_blob ?
+						        new_blob->base.id : 0);
+		if (ret != 0)
+			goto err_created;
+	}
+
+	if (old_blob)
+		drm_property_unreference_blob(old_blob);
+
+	*replace = new_blob;
+
+	return 0;
+
+err_created:
+	drm_property_unreference_blob(new_blob);
+	return ret;
+}
+
+/**
  * drm_mode_getblob_ioctl - get the contents of a blob property value
  * @dev: DRM device
  * @data: ioctl data
@@ -4267,7 +4510,8 @@ int drm_mode_getblob_ioctl(struct drm_device *dev,
 		return -EINVAL;
 
 	drm_modeset_lock_all(dev);
-	blob = drm_property_blob_find(dev, out_resp->blob_id);
+	mutex_lock(&dev->mode_config.blob_lock);
+	blob = __drm_property_lookup_blob(dev, out_resp->blob_id);
 	if (!blob) {
 		ret = -ENOENT;
 		goto done;
@@ -4283,14 +4527,123 @@ int drm_mode_getblob_ioctl(struct drm_device *dev,
 	out_resp->length = blob->length;
 
 done:
+	mutex_unlock(&dev->mode_config.blob_lock);
 	drm_modeset_unlock_all(dev);
 	return ret;
 }
 
 /**
+ * drm_mode_createblob_ioctl - create a new blob property
+ * @dev: DRM device
+ * @data: ioctl data
+ * @file_priv: DRM file info
+ *
+ * This function creates a new blob property with user-defined values. In order
+ * to give us sensible validation and checking when creating, rather than at
+ * every potential use, we also require a type to be provided upfront.
+ *
+ * Called by the user via ioctl.
+ *
+ * Returns:
+ * Zero on success, negative errno on failure.
+ */
+int drm_mode_createblob_ioctl(struct drm_device *dev,
+			      void *data, struct drm_file *file_priv)
+{
+	struct drm_mode_create_blob *out_resp = data;
+	struct drm_property_blob *blob;
+	void __user *blob_ptr;
+	int ret = 0;
+
+	if (!drm_core_check_feature(dev, DRIVER_MODESET))
+		return -EINVAL;
+
+	blob = drm_property_create_blob(dev, out_resp->length, NULL);
+	if (IS_ERR(blob))
+		return PTR_ERR(blob);
+
+	blob_ptr = (void __user *)(unsigned long)out_resp->data;
+	if (copy_from_user(blob->data, blob_ptr, out_resp->length)) {
+		ret = -EFAULT;
+		goto out_blob;
+	}
+
+	/* Dropping the lock between create_blob and our access here is safe
+	 * as only the same file_priv can remove the blob; at this point, it is
+	 * not associated with any file_priv. */
+	mutex_lock(&dev->mode_config.blob_lock);
+	out_resp->blob_id = blob->base.id;
+	list_add_tail(&file_priv->blobs, &blob->head_file);
+	mutex_unlock(&dev->mode_config.blob_lock);
+
+	return 0;
+
+out_blob:
+	drm_property_unreference_blob(blob);
+	return ret;
+}
+
+/**
+ * drm_mode_destroyblob_ioctl - destroy a user blob property
+ * @dev: DRM device
+ * @data: ioctl data
+ * @file_priv: DRM file info
+ *
+ * Destroy an existing user-defined blob property.
+ *
+ * Called by the user via ioctl.
+ *
+ * Returns:
+ * Zero on success, negative errno on failure.
+ */
+int drm_mode_destroyblob_ioctl(struct drm_device *dev,
+			       void *data, struct drm_file *file_priv)
+{
+	struct drm_mode_destroy_blob *out_resp = data;
+	struct drm_property_blob *blob = NULL, *bt;
+	bool found = false;
+	int ret = 0;
+
+	if (!drm_core_check_feature(dev, DRIVER_MODESET))
+		return -EINVAL;
+
+	mutex_lock(&dev->mode_config.blob_lock);
+	blob = __drm_property_lookup_blob(dev, out_resp->blob_id);
+	if (!blob) {
+		ret = -ENOENT;
+		goto err;
+	}
+
+	/* Ensure the property was actually created by this user. */
+	list_for_each_entry(bt, &file_priv->blobs, head_file) {
+		if (bt == blob) {
+			found = true;
+			break;
+		}
+	}
+
+	if (!found) {
+		ret = -EPERM;
+		goto err;
+	}
+
+	/* We must drop head_file here, because we may not be the last
+	 * reference on the blob. */
+	list_del_init(&blob->head_file);
+	drm_property_unreference_blob_locked(blob);
+	mutex_unlock(&dev->mode_config.blob_lock);
+
+	return 0;
+
+err:
+	mutex_unlock(&dev->mode_config.blob_lock);
+	return ret;
+}
+
+/**
  * drm_mode_connector_set_path_property - set tile property on connector
  * @connector: connector to set property on.
- * @path: path to use for property.
+ * @path: path to use for property; must not be NULL.
  *
  * This creates a property to expose to userspace to specify a
  * connector path. This is mainly used for DisplayPort MST where
@@ -4304,17 +4657,14 @@ int drm_mode_connector_set_path_property(struct drm_connector *connector,
 					 const char *path)
 {
 	struct drm_device *dev = connector->dev;
-	size_t size = strlen(path) + 1;
 	int ret;
 
-	connector->path_blob_ptr = drm_property_create_blob(connector->dev,
-							    size, path);
-	if (!connector->path_blob_ptr)
-		return -EINVAL;
-
-	ret = drm_object_property_set_value(&connector->base,
-					    dev->mode_config.path_property,
-					    connector->path_blob_ptr->base.id);
+	ret = drm_property_replace_global_blob(dev,
+	                                       &connector->path_blob_ptr,
+	                                       strlen(path) + 1,
+	                                       path,
+	                                       &connector->base,
+	                                       dev->mode_config.path_property);
 	return ret;
 }
 EXPORT_SYMBOL(drm_mode_connector_set_path_property);
@@ -4333,16 +4683,16 @@ EXPORT_SYMBOL(drm_mode_connector_set_path_property);
 int drm_mode_connector_set_tile_property(struct drm_connector *connector)
 {
 	struct drm_device *dev = connector->dev;
-	int ret, size;
 	char tile[256];
-
-	if (connector->tile_blob_ptr)
-		drm_property_destroy_blob(dev, connector->tile_blob_ptr);
+	int ret;
 
 	if (!connector->has_tile) {
-		connector->tile_blob_ptr = NULL;
-		ret = drm_object_property_set_value(&connector->base,
-						    dev->mode_config.tile_property, 0);
+		ret  = drm_property_replace_global_blob(dev,
+		                                        &connector->tile_blob_ptr,
+		                                        0,
+		                                        NULL,
+		                                        &connector->base,
+		                                        dev->mode_config.tile_property);
 		return ret;
 	}
 
@@ -4351,16 +4701,13 @@ int drm_mode_connector_set_tile_property(struct drm_connector *connector)
 		 connector->num_h_tile, connector->num_v_tile,
 		 connector->tile_h_loc, connector->tile_v_loc,
 		 connector->tile_h_size, connector->tile_v_size);
-	size = strlen(tile) + 1;
-
-	connector->tile_blob_ptr = drm_property_create_blob(connector->dev,
-							    size, tile);
-	if (!connector->tile_blob_ptr)
-		return -EINVAL;
 
-	ret = drm_object_property_set_value(&connector->base,
-					    dev->mode_config.tile_property,
-					    connector->tile_blob_ptr->base.id);
+	ret = drm_property_replace_global_blob(dev,
+	                                       &connector->tile_blob_ptr,
+	                                       strlen(tile) + 1,
+	                                       tile,
+	                                       &connector->base,
+	                                       dev->mode_config.tile_property);
 	return ret;
 }
 EXPORT_SYMBOL(drm_mode_connector_set_tile_property);
@@ -4380,33 +4727,22 @@ int drm_mode_connector_update_edid_property(struct drm_connector *connector,
 					    const struct edid *edid)
 {
 	struct drm_device *dev = connector->dev;
-	size_t size;
+	size_t size = 0;
 	int ret;
 
 	/* ignore requests to set edid when overridden */
 	if (connector->override_edid)
 		return 0;
 
-	if (connector->edid_blob_ptr)
-		drm_property_destroy_blob(dev, connector->edid_blob_ptr);
-
-	/* Delete edid, when there is none. */
-	if (!edid) {
-		connector->edid_blob_ptr = NULL;
-		ret = drm_object_property_set_value(&connector->base, dev->mode_config.edid_property, 0);
-		return ret;
-	}
-
-	size = EDID_LENGTH * (1 + edid->extensions);
-	connector->edid_blob_ptr = drm_property_create_blob(connector->dev,
-							    size, edid);
-	if (!connector->edid_blob_ptr)
-		return -EINVAL;
-
-	ret = drm_object_property_set_value(&connector->base,
-					       dev->mode_config.edid_property,
-					       connector->edid_blob_ptr->base.id);
+	if (edid)
+		size = EDID_LENGTH * (1 + edid->extensions);
 
+	ret = drm_property_replace_global_blob(dev,
+					       &connector->edid_blob_ptr,
+	                                       size,
+	                                       edid,
+	                                       &connector->base,
+	                                       dev->mode_config.edid_property);
 	return ret;
 }
 EXPORT_SYMBOL(drm_mode_connector_update_edid_property);
@@ -4447,8 +4783,18 @@ bool drm_property_change_valid_get(struct drm_property *property,
 			valid_mask |= (1ULL << property->values[i]);
 		return !(value & ~valid_mask);
 	} else if (drm_property_type_is(property, DRM_MODE_PROP_BLOB)) {
-		/* Only the driver knows */
-		return true;
+		struct drm_property_blob *blob;
+
+		if (value == 0)
+			return true;
+
+		blob = drm_property_lookup_blob(property->dev, value);
+		if (blob) {
+			*ref = &blob->base;
+			return true;
+		} else {
+			return false;
+		}
 	} else if (drm_property_type_is(property, DRM_MODE_PROP_OBJECT)) {
 		/* a zero value for an object property translates to null: */
 		if (value == 0)
@@ -4484,7 +4830,8 @@ void drm_property_change_valid_put(struct drm_property *property,
 	if (drm_property_type_is(property, DRM_MODE_PROP_OBJECT)) {
 		if (property->values[0] == DRM_MODE_OBJECT_FB)
 			drm_framebuffer_unreference(obj_to_fb(ref));
-	}
+	} else if (drm_property_type_is(property, DRM_MODE_PROP_BLOB))
+		drm_property_unreference_blob(obj_to_blob(ref));
 }
 
 /**
@@ -5430,6 +5777,7 @@ void drm_mode_config_init(struct drm_device *dev)
 	drm_modeset_lock_init(&dev->mode_config.connection_mutex);
 	mutex_init(&dev->mode_config.idr_mutex);
 	mutex_init(&dev->mode_config.fb_lock);
+	mutex_init(&dev->mode_config.blob_lock);
 	INIT_LIST_HEAD(&dev->mode_config.fb_list);
 	INIT_LIST_HEAD(&dev->mode_config.crtc_list);
 	INIT_LIST_HEAD(&dev->mode_config.connector_list);
@@ -5493,8 +5841,8 @@ void drm_mode_config_cleanup(struct drm_device *dev)
 	}
 
 	list_for_each_entry_safe(blob, bt, &dev->mode_config.property_blob_list,
-				 head) {
-		drm_property_destroy_blob(dev, blob);
+				 head_global) {
+		drm_property_unreference_blob(blob);
 	}
 
 	/*