From patchwork Mon Sep 13 13:11:19 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 510515 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D82D0C433EF for ; Mon, 13 Sep 2021 14:25:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C210760F26 for ; Mon, 13 Sep 2021 14:25:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244813AbhIMO0d (ORCPT ); Mon, 13 Sep 2021 10:26:33 -0400 Received: from mail.kernel.org ([198.145.29.99]:45414 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1345503AbhIMOWs (ORCPT ); Mon, 13 Sep 2021 10:22:48 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 4DE6A61390; Mon, 13 Sep 2021 13:47:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1631540868; bh=CsjYALVIpDrXms1/IH5MyVOgUNBA0DQFj67fi+aflx0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=tydI5aZsouYmNqP47syYmiAY1sNCrDB/m5GLUzWG63Tnh0WJGuHkaZs+sQ2wTw2X4 yTcl4u/cz5dC7y6iz0zmCZjlwJ4GhRSPzvUBwi8VWj7ZAXoNixmsAc8Rpmaod1FOCC jD+gcqFomIvJgRHOu5cKxqFgIIjYh1RKX0Ody3E4= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Vineeth Vijayan , Peter Oberparleiter , Vasily Gorbik , Sasha Levin Subject: [PATCH 5.14 025/334] s390/cio: add dev_busid sysfs entry for each subchannel Date: Mon, 13 Sep 2021 15:11:19 +0200 Message-Id: <20210913131114.263107419@linuxfoundation.org> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210913131113.390368911@linuxfoundation.org> References: <20210913131113.390368911@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Vineeth Vijayan [ Upstream commit d3683c055212bf910d4e318f7944910ce10dbee6 ] Introduce dev_busid, which exports the device-id associated with the io-subchannel (and message-subchannel). The dev_busid indicates that of the device which may be physically installed on the corrosponding subchannel. The dev_busid value "none" indicates that the subchannel is not valid, there is no I/O device currently associated with the subchannel. The dev_busid information would be helpful to write device-specific udev-rules associated with the subchannel. The dev_busid interface would be available even when the sch is not bound to any driver or if there is no operational device connected on it. Hence this attribute can be used to write udev-rules which are specific to the device associated with the subchannel. Signed-off-by: Vineeth Vijayan Reviewed-by: Peter Oberparleiter Signed-off-by: Vasily Gorbik Signed-off-by: Sasha Levin --- drivers/s390/cio/css.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c index a974943c27da..9fcdb8d81eee 100644 --- a/drivers/s390/cio/css.c +++ b/drivers/s390/cio/css.c @@ -430,9 +430,26 @@ static ssize_t pimpampom_show(struct device *dev, } static DEVICE_ATTR_RO(pimpampom); +static ssize_t dev_busid_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct subchannel *sch = to_subchannel(dev); + struct pmcw *pmcw = &sch->schib.pmcw; + + if ((pmcw->st == SUBCHANNEL_TYPE_IO || + pmcw->st == SUBCHANNEL_TYPE_MSG) && pmcw->dnv) + return sysfs_emit(buf, "0.%x.%04x\n", sch->schid.ssid, + pmcw->dev); + else + return sysfs_emit(buf, "none\n"); +} +static DEVICE_ATTR_RO(dev_busid); + static struct attribute *io_subchannel_type_attrs[] = { &dev_attr_chpids.attr, &dev_attr_pimpampom.attr, + &dev_attr_dev_busid.attr, NULL, }; ATTRIBUTE_GROUPS(io_subchannel_type);