From patchwork Wed Mar 17 02:22:53 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Fenghua Yu X-Patchwork-Id: 403518 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=-16.8 required=3.0 tests=BAYES_00, 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 9A838C2BA1E for ; Wed, 17 Mar 2021 02:25:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7EAE064F9D for ; Wed, 17 Mar 2021 02:25:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231148AbhCQCZG (ORCPT ); Tue, 16 Mar 2021 22:25:06 -0400 Received: from mga01.intel.com ([192.55.52.88]:55652 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230468AbhCQCYg (ORCPT ); Tue, 16 Mar 2021 22:24:36 -0400 IronPort-SDR: hkEOyDxdn4rtkpow6/K/nEJW1DKrVRdkyOz4tdnRUd26JdEHHqi4af6wVgjJhuTsxSOjqRL0+W w7Y0msXkK8MQ== X-IronPort-AV: E=McAfee;i="6000,8403,9925"; a="209328722" X-IronPort-AV: E=Sophos;i="5.81,254,1610438400"; d="scan'208";a="209328722" Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Mar 2021 19:24:34 -0700 IronPort-SDR: q2z2iOEjVwZXGL4isgWc4m2ByFV5d6LNblQk4iJWOX6mAAb5A4s1+lrAkM79qIQ6kn50XVx0rZ TvaILrSc8kSw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.81,254,1610438400"; d="scan'208";a="440290296" Received: from otcwcpicx3.sc.intel.com ([172.25.55.73]) by FMSMGA003.fm.intel.com with ESMTP; 16 Mar 2021 19:24:34 -0700 From: Fenghua Yu To: "Shuah Khan" , "Tony Luck" , "Reinette Chatre" , "Babu Moger" , "Ravi V Shankar" Cc: "linux-kselftest" , "linux-kernel" , Fenghua Yu Subject: [PATCH v6 19/21] selftests/resctrl: Fix incorrect parsing of iMC counters Date: Wed, 17 Mar 2021 02:22:53 +0000 Message-Id: <20210317022255.2536745-20-fenghua.yu@intel.com> X-Mailer: git-send-email 2.31.0 In-Reply-To: <20210317022255.2536745-1-fenghua.yu@intel.com> References: <20210317022255.2536745-1-fenghua.yu@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org 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 --- 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 5dfae51133bc..20d457c47ded 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);