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 C3C0CC433EF for ; Mon, 6 Sep 2021 01:36:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A8CF26008E for ; Mon, 6 Sep 2021 01:36:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241256AbhIFBgo (ORCPT ); Sun, 5 Sep 2021 21:36:44 -0400 Received: from mail.kernel.org ([198.145.29.99]:46932 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239839AbhIFB3C (ORCPT ); Sun, 5 Sep 2021 21:29:02 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 00617610FD; Mon, 6 Sep 2021 01:23:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1630891388; bh=AcB6rgKsnEZum9fY6eXTrB/nElr4h8DulqdY1j98qa0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=n+dD692hVZFSWfpLmWacEIjZC8h7VMEsDiFvoMqxzIRFI2oTHpSdG1eIB0ZfMr1N4 hO2jckouSEqBIbwAqFxmu2RnfI7sTTmilCj9h33vXN1++dMq2aszX005qPgSLUvQTX kUQmHpGGrZ3BNU0El5XWZzc5504IBmXC+v40VVRVlrXnXIeGNbk9d0XQFnuUH3xluo uPMyqleesRGYyZaNA9rYNrQnpQyDiIZ1a08S5QcEJW3oRhgxMzMOtw42UiZZg9MvG7 ylydpnO0/IMyfpKDwAIvdyCXWKSxHWInVNc1cERniPAz/jn8mCFCtkzcO7SBfHKCvg 98eFMLsA45Hlg== 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 5.4 20/30] s390/cio: add dev_busid sysfs entry for each subchannel Date: Sun, 5 Sep 2021 21:22:33 -0400 Message-Id: <20210906012244.930338-20-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210906012244.930338-1-sashal@kernel.org> References: <20210906012244.930338-1-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-kernel@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 5734a78dbb8e..7950ac59b174 100644 --- a/drivers/s390/cio/css.c +++ b/drivers/s390/cio/css.c @@ -426,9 +426,26 @@ 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