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=-16.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,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 D3526C43617 for ; Mon, 10 May 2021 10:50:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B11F1619C8 for ; Mon, 10 May 2021 10:50:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233162AbhEJKvv (ORCPT ); Mon, 10 May 2021 06:51:51 -0400 Received: from mail.kernel.org ([198.145.29.99]:33618 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233523AbhEJKuL (ORCPT ); Mon, 10 May 2021 06:50:11 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 7F592619E6; Mon, 10 May 2021 10:39:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1620643151; bh=iHP5PI9dFvN+iJnh0PXIZUJf03sir2CeqLFELWPo6tY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=0GCazAY9pfKHc0EoCAwl3N4DTXm6+AcdHmhLAsaZyfFcELsuMmr2xyS7C2dFneEs+ BdjRdGmdZ2TVU7S2DR0w9puuxiQ3dmFVILzZaR/0z0iklsTVi7gNUxpok/3SoknZgw 1HNGXdgx3Jc2rz5ThJFKjBhP+S3e/rTKummAFl0g= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Reinette Chatre , Babu Moger , Fenghua Yu , Shuah Khan , Sasha Levin Subject: [PATCH 5.10 163/299] selftests/resctrl: Fix incorrect parsing of iMC counters Date: Mon, 10 May 2021 12:19:20 +0200 Message-Id: <20210510102010.340979798@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210510102004.821838356@linuxfoundation.org> References: <20210510102004.821838356@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: stable@vger.kernel.org From: Fenghua Yu [ Upstream commit d81343b5eedf84be71a4313e8fd073d0c510afcf ] iMC (Integrated Memory Controller) counters are usually at "/sys/bus/event_source/devices/" and are named as "uncore_imc_". num_of_imcs() function tries to count number of such iMC counters so that it could appropriately initialize required number of perf_attr structures that could be used to read these iMC counters. num_of_imcs() function assumes that all the directories under this path that start with "uncore_imc" are iMC counters. But, on some systems there could be directories named as "uncore_imc_free_running" which aren't iMC counters. Trying to read from such directories will result in "not found file" errors and MBM/MBA tests will fail. Hence, fix the logic in num_of_imcs() such that it looks at the first character after "uncore_imc_" to check if it's a numerical digit or not. If it's a digit then the directory represents an iMC counter, else, skip the directory. Reported-by: Reinette Chatre Tested-by: Babu Moger Signed-off-by: Fenghua Yu Signed-off-by: Shuah Khan Signed-off-by: Sasha Levin --- tools/testing/selftests/resctrl/resctrl_val.c | 22 +++++++++++++++++-- 1 file changed, 20 insertions(+), 2 deletions(-) diff --git a/tools/testing/selftests/resctrl/resctrl_val.c b/tools/testing/selftests/resctrl/resctrl_val.c index aed71fd0713b..5478c23c62ba 100644 --- a/tools/testing/selftests/resctrl/resctrl_val.c +++ b/tools/testing/selftests/resctrl/resctrl_val.c @@ -221,8 +221,8 @@ static int read_from_imc_dir(char *imc_dir, int count) */ static int num_of_imcs(void) { + char imc_dir[512], *temp; unsigned int count = 0; - char imc_dir[512]; struct dirent *ep; int ret; DIR *dp; @@ -230,7 +230,25 @@ static int num_of_imcs(void) dp = opendir(DYN_PMU_PATH); if (dp) { while ((ep = readdir(dp))) { - if (strstr(ep->d_name, UNCORE_IMC)) { + temp = strstr(ep->d_name, UNCORE_IMC); + if (!temp) + continue; + + /* + * imc counters are named as "uncore_imc_", hence + * increment the pointer to point to . Note that + * sizeof(UNCORE_IMC) would count for null character as + * well and hence the last underscore character in + * uncore_imc'_' need not be counted. + */ + temp = temp + sizeof(UNCORE_IMC); + + /* + * Some directories under "DYN_PMU_PATH" could have + * names like "uncore_imc_free_running", hence, check if + * first character is a numerical digit or not. + */ + if (temp[0] >= '0' && temp[0] <= '9') { sprintf(imc_dir, "%s/%s/", DYN_PMU_PATH, ep->d_name); ret = read_from_imc_dir(imc_dir, count); -- 2.30.2