From mboxrd@z Thu Jan 1 00:00:00 1970 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=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 B4F38C433EF for ; Mon, 6 Sep 2021 01:31:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9D7E160F43 for ; Mon, 6 Sep 2021 01:31:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241594AbhIFBcx (ORCPT ); Sun, 5 Sep 2021 21:32:53 -0400 Received: from mail.kernel.org ([198.145.29.99]:47508 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1351400AbhIFBa1 (ORCPT ); Sun, 5 Sep 2021 21:30:27 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id AF2C66120F; Mon, 6 Sep 2021 01:23:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1630891421; bh=/RylU52czDfaiM3F7W790mWH3u6dY9JBCjKLFY6ARfk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Hvho3ub29dmDd81BF+g0N2o6ORK2gN8tsjE494AI+nSlR41sse13300rPFL1rMes7 BmihYNxt0UePXTPslpOEWo2N2X+TjtKctl8LFY5QAammseMF+ticgicYZ1BSVbCRHp IoVYR/eJxpnFwoov0Gx0IndDFWkN2Tkq/bG0dO7JL7jPyyW+ocF29Hcrr3b03JdPo2 SgUSgd/fvwvPdb8CUWE/tcwPAPP4m6qajOjMGKUuBCtMNJdME0onr6v6V9yUY5YDgz z54T8TJs26ISkRbgb3v08BJpeNZN1HtWjYDaGH8GR9KySJb1OMATvbfF6P2vj9cKpc hwkhstxrIp+pQ== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Vineeth Vijayan , Peter Oberparleiter , Vasily Gorbik , Sasha Levin , linux-s390@vger.kernel.org Subject: [PATCH AUTOSEL 4.19 15/23] s390/cio: add dev_busid sysfs entry for each subchannel Date: Sun, 5 Sep 2021 21:23:14 -0400 Message-Id: <20210906012322.930668-15-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210906012322.930668-1-sashal@kernel.org> References: <20210906012322.930668-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit 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 825a8f2703b4..6efe50d70c4b 100644 --- a/drivers/s390/cio/css.c +++ b/drivers/s390/cio/css.c @@ -364,9 +364,26 @@ 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); -- 2.30.2