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,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,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 628A7C07E9E for ; Mon, 12 Jul 2021 07:16:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4B8F96157E for ; Mon, 12 Jul 2021 07:16:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242310AbhGLHTB (ORCPT ); Mon, 12 Jul 2021 03:19:01 -0400 Received: from mail.kernel.org ([198.145.29.99]:53294 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233379AbhGLGxF (ORCPT ); Mon, 12 Jul 2021 02:53:05 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 9DDF361283; Mon, 12 Jul 2021 06:50:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1626072617; bh=YKAMSYzA1036o9x61Hxa0VrxHLMVvLdRs/KNHYKJQgc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=CslTnn1JDxCt3W9Dy3Di8Fyl0TwlCdrVV8gm7+VPkJZhOxOz9Yim0hBY5HNyeNLuv +pPkbE/rX+4UPl0zkZy258CJlMS9x1vrJ2oYjRzv3BPbAMp/tm2rlR2nC03IGklDyO fxJTS8BKC2iouOcPdMzPaxByVoBkRPeSIY/8YEwg= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Vaibhav Jain , Dan Williams , Michael Ellerman , Sasha Levin Subject: [PATCH 5.10 556/593] powerpc/papr_scm: Make perf_stats invisible if perf-stats unavailable Date: Mon, 12 Jul 2021 08:11:56 +0200 Message-Id: <20210712060955.652625073@linuxfoundation.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210712060843.180606720@linuxfoundation.org> References: <20210712060843.180606720@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Vaibhav Jain [ Upstream commit ed78f56e1271f108e8af61baeba383dcd77adbec ] In case performance stats for an nvdimm are not available, reading the 'perf_stats' sysfs file returns an -ENOENT error. A better approach is to make the 'perf_stats' file entirely invisible to indicate that performance stats for an nvdimm are unavailable. So this patch updates 'papr_nd_attribute_group' to add a 'is_visible' callback implemented as newly introduced 'papr_nd_attribute_visible()' that returns an appropriate mode in case performance stats aren't supported in a given nvdimm. Also the initialization of 'papr_scm_priv.stat_buffer_len' is moved from papr_scm_nvdimm_init() to papr_scm_probe() so that it value is available when 'papr_nd_attribute_visible()' is called during nvdimm initialization. Even though 'perf_stats' attribute is available since v5.9, there are no known user-space tools/scripts that are dependent on presence of its sysfs file. Hence I dont expect any user-space breakage with this patch. Fixes: 2d02bf835e57 ("powerpc/papr_scm: Fetch nvdimm performance stats from PHYP") Signed-off-by: Vaibhav Jain Reviewed-by: Dan Williams Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20210513092349.285021-1-vaibhav@linux.ibm.com Signed-off-by: Sasha Levin --- Documentation/ABI/testing/sysfs-bus-papr-pmem | 8 +++-- arch/powerpc/platforms/pseries/papr_scm.c | 35 +++++++++++++------ 2 files changed, 29 insertions(+), 14 deletions(-) diff --git a/Documentation/ABI/testing/sysfs-bus-papr-pmem b/Documentation/ABI/testing/sysfs-bus-papr-pmem index 8316c33862a0..0aa02bf2bde5 100644 --- a/Documentation/ABI/testing/sysfs-bus-papr-pmem +++ b/Documentation/ABI/testing/sysfs-bus-papr-pmem @@ -39,9 +39,11 @@ KernelVersion: v5.9 Contact: linuxppc-dev , linux-nvdimm@lists.01.org, Description: (RO) Report various performance stats related to papr-scm NVDIMM - device. Each stat is reported on a new line with each line - composed of a stat-identifier followed by it value. Below are - currently known dimm performance stats which are reported: + device. This attribute is only available for NVDIMM devices + that support reporting NVDIMM performance stats. Each stat is + reported on a new line with each line composed of a + stat-identifier followed by it value. Below are currently known + dimm performance stats which are reported: * "CtlResCt" : Controller Reset Count * "CtlResTm" : Controller Reset Elapsed Time diff --git a/arch/powerpc/platforms/pseries/papr_scm.c b/arch/powerpc/platforms/pseries/papr_scm.c index 0693bc8d70ac..057acbb9116d 100644 --- a/arch/powerpc/platforms/pseries/papr_scm.c +++ b/arch/powerpc/platforms/pseries/papr_scm.c @@ -868,6 +868,20 @@ static ssize_t flags_show(struct device *dev, } DEVICE_ATTR_RO(flags); +static umode_t papr_nd_attribute_visible(struct kobject *kobj, + struct attribute *attr, int n) +{ + struct device *dev = kobj_to_dev(kobj); + struct nvdimm *nvdimm = to_nvdimm(dev); + struct papr_scm_priv *p = nvdimm_provider_data(nvdimm); + + /* For if perf-stats not available remove perf_stats sysfs */ + if (attr == &dev_attr_perf_stats.attr && p->stat_buffer_len == 0) + return 0; + + return attr->mode; +} + /* papr_scm specific dimm attributes */ static struct attribute *papr_nd_attributes[] = { &dev_attr_flags.attr, @@ -877,6 +891,7 @@ static struct attribute *papr_nd_attributes[] = { static struct attribute_group papr_nd_attribute_group = { .name = "papr", + .is_visible = papr_nd_attribute_visible, .attrs = papr_nd_attributes, }; @@ -892,7 +907,6 @@ static int papr_scm_nvdimm_init(struct papr_scm_priv *p) struct nd_region_desc ndr_desc; unsigned long dimm_flags; int target_nid, online_nid; - ssize_t stat_size; p->bus_desc.ndctl = papr_scm_ndctl; p->bus_desc.module = THIS_MODULE; @@ -963,16 +977,6 @@ static int papr_scm_nvdimm_init(struct papr_scm_priv *p) list_add_tail(&p->region_list, &papr_nd_regions); mutex_unlock(&papr_ndr_lock); - /* Try retriving the stat buffer and see if its supported */ - stat_size = drc_pmem_query_stats(p, NULL, 0); - if (stat_size > 0) { - p->stat_buffer_len = stat_size; - dev_dbg(&p->pdev->dev, "Max perf-stat size %lu-bytes\n", - p->stat_buffer_len); - } else { - dev_info(&p->pdev->dev, "Dimm performance stats unavailable\n"); - } - return 0; err: nvdimm_bus_unregister(p->bus); @@ -1050,6 +1054,7 @@ static int papr_scm_probe(struct platform_device *pdev) struct papr_scm_priv *p; u8 uuid_raw[UUID_SIZE]; const char *uuid_str; + ssize_t stat_size; uuid_t uuid; int rc; @@ -1133,6 +1138,14 @@ static int papr_scm_probe(struct platform_device *pdev) p->res.name = pdev->name; p->res.flags = IORESOURCE_MEM; + /* Try retrieving the stat buffer and see if its supported */ + stat_size = drc_pmem_query_stats(p, NULL, 0); + if (stat_size > 0) { + p->stat_buffer_len = stat_size; + dev_dbg(&p->pdev->dev, "Max perf-stat size %lu-bytes\n", + p->stat_buffer_len); + } + rc = papr_scm_nvdimm_init(p); if (rc) goto err2; -- 2.30.2