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, 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 09741C4360C for ; Mon, 10 May 2021 12:22:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D777961601 for ; Mon, 10 May 2021 12:22:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345318AbhEJMWV (ORCPT ); Mon, 10 May 2021 08:22:21 -0400 Received: from mail.kernel.org ([198.145.29.99]:46208 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236932AbhEJLLA (ORCPT ); Mon, 10 May 2021 07:11:00 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 89B24613D3; Mon, 10 May 2021 11:05:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1620644756; bh=T54aLA5wD0D6/LLW3960542PD7sKXeumim8pBYl7Fos=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=XPwrnewayjP/PbYkKjoKWQPrBEPKnABqeM/UPfRRNSZ1aCaknP/M8U0dnf0S6tZil bF+VjTGPzFkgltFqK7THtkq2MhYq0FuN6EUSROPnH3ohORQKQjMzfQ7J+rwcGR6ZjM SjJpBDLn3utjzyAOUXVEkbfEwnXJOOw18slZLkWo= 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 5.12 211/384] selftests/resctrl: Use resctrl/info for feature detection Date: Mon, 10 May 2021 12:20:00 +0200 Message-Id: <20210510102021.850812603@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210510102014.849075526@linuxfoundation.org> References: <20210510102014.849075526@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: Fenghua Yu [ Upstream commit ee0415681eb661efa1eb2db7acc263f2c7df1e23 ] Resctrl test suite before running any unit test (like cmt, cat, mbm and mba) should first check if the feature is enabled (by kernel and not just supported by H/W) on the platform or not. validate_resctrl_feature_request() is supposed to do that. This function intends to grep for relevant flags in /proc/cpuinfo but there are several issues here 1. validate_resctrl_feature_request() calls fgrep() to get flags from /proc/cpuinfo. But, fgrep() can only return a string with maximum of 255 characters and hence the complete cpu flags are never returned. 2. The substring search logic is also busted. If strstr() finds requested resctrl feature in the cpu flags, it returns pointer to the first occurrence. But, the logic negates the return value of strstr() and hence validate_resctrl_feature_request() returns false if the feature is present in the cpu flags and returns true if the feature is not present. 3. validate_resctrl_feature_request() checks if a resctrl feature is reported in /proc/cpuinfo flags or not. Having a cpu flag means that the H/W supports the feature, but it doesn't mean that the kernel enabled it. A user could selectively enable only a subset of resctrl features using kernel command line arguments. Hence, /proc/cpuinfo isn't a reliable source to check if a feature is enabled or not. The 3rd issue being the major one and fixing it requires changing the way validate_resctrl_feature_request() works. Since, /proc/cpuinfo isn't the right place to check if a resctrl feature is enabled or not, a more appropriate place is /sys/fs/resctrl/info directory. Change validate_resctrl_feature_request() such that, 1. For cat, check if /sys/fs/resctrl/info/L3 directory is present or not 2. For mba, check if /sys/fs/resctrl/info/MB directory is present or not 3. For cmt, check if /sys/fs/resctrl/info/L3_MON directory is present and check if /sys/fs/resctrl/info/L3_MON/mon_features has llc_occupancy 4. For mbm, check if /sys/fs/resctrl/info/L3_MON directory is present and check if /sys/fs/resctrl/info/L3_MON/mon_features has mbm__bytes Please note that only L3_CAT, L3_CMT, MBA and MBM are supported. CDP and L2 variants can be added later. 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.h | 6 ++- tools/testing/selftests/resctrl/resctrlfs.c | 52 ++++++++++++++++----- 2 files changed, 46 insertions(+), 12 deletions(-) diff --git a/tools/testing/selftests/resctrl/resctrl.h b/tools/testing/selftests/resctrl/resctrl.h index 36da6136af96..9dcc96e1ad3d 100644 --- a/tools/testing/selftests/resctrl/resctrl.h +++ b/tools/testing/selftests/resctrl/resctrl.h @@ -28,6 +28,10 @@ #define RESCTRL_PATH "/sys/fs/resctrl" #define PHYS_ID_PATH "/sys/devices/system/cpu/cpu" #define CBM_MASK_PATH "/sys/fs/resctrl/info" +#define L3_PATH "/sys/fs/resctrl/info/L3" +#define MB_PATH "/sys/fs/resctrl/info/MB" +#define L3_MON_PATH "/sys/fs/resctrl/info/L3_MON" +#define L3_MON_FEATURES_PATH "/sys/fs/resctrl/info/L3_MON/mon_features" #define PARENT_EXIT(err_msg) \ do { \ @@ -79,7 +83,7 @@ int remount_resctrlfs(bool mum_resctrlfs); int get_resource_id(int cpu_no, int *resource_id); int umount_resctrlfs(void); int validate_bw_report_request(char *bw_report); -bool validate_resctrl_feature_request(char *resctrl_val); +bool validate_resctrl_feature_request(const char *resctrl_val); char *fgrep(FILE *inf, const char *str); int taskset_benchmark(pid_t bm_pid, int cpu_no); void run_benchmark(int signum, siginfo_t *info, void *ucontext); diff --git a/tools/testing/selftests/resctrl/resctrlfs.c b/tools/testing/selftests/resctrl/resctrlfs.c index 4174e48e06d1..b57170f53861 100644 --- a/tools/testing/selftests/resctrl/resctrlfs.c +++ b/tools/testing/selftests/resctrl/resctrlfs.c @@ -616,26 +616,56 @@ char *fgrep(FILE *inf, const char *str) * validate_resctrl_feature_request - Check if requested feature is valid. * @resctrl_val: Requested feature * - * Return: 0 on success, non-zero on failure + * Return: True if the feature is supported, else false */ -bool validate_resctrl_feature_request(char *resctrl_val) +bool validate_resctrl_feature_request(const char *resctrl_val) { - FILE *inf = fopen("/proc/cpuinfo", "r"); + struct stat statbuf; bool found = false; char *res; + FILE *inf; - if (!inf) + if (!resctrl_val) return false; - res = fgrep(inf, "flags"); - - if (res) { - char *s = strchr(res, ':'); + if (remount_resctrlfs(false)) + return false; - found = s && !strstr(s, resctrl_val); - free(res); + if (!strncmp(resctrl_val, CAT_STR, sizeof(CAT_STR))) { + if (!stat(L3_PATH, &statbuf)) + return true; + } else if (!strncmp(resctrl_val, MBA_STR, sizeof(MBA_STR))) { + if (!stat(MB_PATH, &statbuf)) + return true; + } else if (!strncmp(resctrl_val, MBM_STR, sizeof(MBM_STR)) || + !strncmp(resctrl_val, CMT_STR, sizeof(CMT_STR))) { + if (!stat(L3_MON_PATH, &statbuf)) { + inf = fopen(L3_MON_FEATURES_PATH, "r"); + if (!inf) + return false; + + if (!strncmp(resctrl_val, CMT_STR, sizeof(CMT_STR))) { + res = fgrep(inf, "llc_occupancy"); + if (res) { + found = true; + free(res); + } + } + + if (!strncmp(resctrl_val, MBM_STR, sizeof(MBM_STR))) { + res = fgrep(inf, "mbm_total_bytes"); + if (res) { + free(res); + res = fgrep(inf, "mbm_local_bytes"); + if (res) { + found = true; + free(res); + } + } + } + fclose(inf); + } } - fclose(inf); return found; } -- 2.30.2