From patchwork Mon Sep 2 04:24:36 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Parav Pandit X-Patchwork-Id: 11125969 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 920E71399 for ; Mon, 2 Sep 2019 04:25:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 712E522CF7 for ; Mon, 2 Sep 2019 04:25:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729576AbfIBEY5 (ORCPT ); Mon, 2 Sep 2019 00:24:57 -0400 Received: from mail-il-dmz.mellanox.com ([193.47.165.129]:35703 "EHLO mellanox.co.il" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1729565AbfIBEY4 (ORCPT ); Mon, 2 Sep 2019 00:24:56 -0400 Received: from Internal Mail-Server by MTLPINE1 (envelope-from parav@mellanox.com) with ESMTPS (AES256-SHA encrypted); 2 Sep 2019 07:24:53 +0300 Received: from sw-mtx-036.mtx.labs.mlnx (sw-mtx-036.mtx.labs.mlnx [10.12.150.149]) by labmailer.mlnx (8.13.8/8.13.8) with ESMTP id x824OeRP001225; Mon, 2 Sep 2019 07:24:51 +0300 From: Parav Pandit To: alex.williamson@redhat.com, jiri@mellanox.com, kwankhede@nvidia.com, cohuck@redhat.com, davem@davemloft.net Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, Parav Pandit Subject: [PATCH v3 5/5] mtty: Optionally support mtty alias Date: Sun, 1 Sep 2019 23:24:36 -0500 Message-Id: <20190902042436.23294-6-parav@mellanox.com> X-Mailer: git-send-email 2.19.2 In-Reply-To: <20190902042436.23294-1-parav@mellanox.com> References: <20190826204119.54386-1-parav@mellanox.com> <20190902042436.23294-1-parav@mellanox.com> MIME-Version: 1.0 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Provide a module parameter to set alias length to optionally generate mdev alias. Example to request mdev alias. $ modprobe mtty alias_length=12 Make use of mtty_alias() API when alias_length module parameter is set. Signed-off-by: Parav Pandit --- Changelog: v1->v2: - Added mdev_alias() usage sample --- samples/vfio-mdev/mtty.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/samples/vfio-mdev/mtty.c b/samples/vfio-mdev/mtty.c index 92e770a06ea2..075d65440bc0 100644 --- a/samples/vfio-mdev/mtty.c +++ b/samples/vfio-mdev/mtty.c @@ -150,6 +150,10 @@ static const struct file_operations vd_fops = { .owner = THIS_MODULE, }; +static unsigned int mtty_alias_length; +module_param_named(alias_length, mtty_alias_length, uint, 0444); +MODULE_PARM_DESC(alias_length, "mdev alias length; default=0"); + /* function prototypes */ static int mtty_trigger_interrupt(const guid_t *uuid); @@ -770,6 +774,9 @@ static int mtty_create(struct kobject *kobj, struct mdev_device *mdev) list_add(&mdev_state->next, &mdev_devices_list); mutex_unlock(&mdev_list_lock); + if (mtty_alias_length) + dev_dbg(mdev_dev(mdev), "alias is %s\n", mdev_alias(mdev)); + return 0; } @@ -1410,6 +1417,11 @@ static struct attribute_group *mdev_type_groups[] = { NULL, }; +static unsigned int mtty_get_alias_length(void) +{ + return mtty_alias_length; +} + static const struct mdev_parent_ops mdev_fops = { .owner = THIS_MODULE, .dev_attr_groups = mtty_dev_groups, @@ -1422,6 +1434,7 @@ static const struct mdev_parent_ops mdev_fops = { .read = mtty_read, .write = mtty_write, .ioctl = mtty_ioctl, + .get_alias_length = mtty_get_alias_length }; static void mtty_device_release(struct device *dev)