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=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 7B40EC433F5 for ; Mon, 6 Sep 2021 01:22:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 67B98611BF for ; Mon, 6 Sep 2021 01:22:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239478AbhIFBX7 (ORCPT ); Sun, 5 Sep 2021 21:23:59 -0400 Received: from mail.kernel.org ([198.145.29.99]:39010 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239486AbhIFBW4 (ORCPT ); Sun, 5 Sep 2021 21:22:56 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id C5C0061054; Mon, 6 Sep 2021 01:21:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1630891284; bh=CsjYALVIpDrXms1/IH5MyVOgUNBA0DQFj67fi+aflx0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=aRwJRIyZOgSnHudDjs6C1RkJDHTDzWOfH1U22ZyiPe6V1YU7phRouOUoZKeifiJTS smMcjf9vTeOzawODMVu1XyLl1PCj7T3P5EDY02n0BL5ToqvXoITcaXl89W1Fq4PLay RO9I/gYVttpLa6jDUKVEp5B6aYif7PiqSV6QSKMG8o0Ej4ovCAiLzeBz85M74IQG8y 7DFN6YlIk6TzU3YLCkq1mXiuhbUk0+TxxzLBaHNR9riQU4NhNKpwsxxDzsxudb3gWf afkFlOr85KMwfThfvxSo774UdO8R3H5xXWoHSZTuhFvLCtB9/9j4mycHDYRSeRjzpk P8Qrvn3SM1hEA== 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 5.13 25/46] s390/cio: add dev_busid sysfs entry for each subchannel Date: Sun, 5 Sep 2021 21:20:30 -0400 Message-Id: <20210906012052.929174-25-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210906012052.929174-1-sashal@kernel.org> References: <20210906012052.929174-1-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: linux-s390@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); -- 2.30.2