From patchwork Thu Jan 25 11:10:55 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Maciej Wieczor-Retman X-Patchwork-Id: 767851 Received: from mgamail.intel.com (mgamail.intel.com [192.55.52.88]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id F01DF51C20; Thu, 25 Jan 2024 11:11:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.55.52.88 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706181075; cv=none; b=ftXSwv2feydq3QG2go/H/0QdeDi/bhxTgMjxRRm26unpin85tr8zmxlKmRaMFuOZ/848pn1kL4XLGYPAiRwi2FvK918Tpo/ICzcaDHHaCpIDDg3m+1RZApKjY+27y/4gd8tgpnma06UJs3RyzeM7eujWTwlEx9LZkLbU98Wq0Ew= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706181075; c=relaxed/simple; bh=33NHf8hKMsj/l+cEJaT9H1sPZXBn7CyH0lKsCXmRwnY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=XBiiepnmm8KvuzurBWcvCORJyf63cyDSGj/YXT9o5dAgGxsCqLLAdkRshTuAeyJnsOX2kqWxxAZFX+CVWdNGt52nnDsH45GsWniAGQadAl8sg3T9p2PVffFiooJOgNMa8lzjEgMB1+lvvvH0oa4eKs5JhkNktuVJeFxClnKEceA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=RkoI9W8M; arc=none smtp.client-ip=192.55.52.88 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="RkoI9W8M" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1706181074; x=1737717074; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=33NHf8hKMsj/l+cEJaT9H1sPZXBn7CyH0lKsCXmRwnY=; b=RkoI9W8Mz63QrjvG0brad1lZBbN6GfOeMDx/c0mMn40K0aeDT6FPfhKX BNkMAuK86Rp76B6PSrKSQ+ABUrblXjHHsOQGUZM0FtXKtO6CGXt4QJH5Q yCNflk1ywWurGCDcQUdxWZXUxZobJhQOmBlKuF9ohSx3mqVFrbkH0C4MO 7lPg8bO0X88L0pwfHr3AkSXVFrCyf9E+DuHf9ItRkStgYRzbLPxlQbgI6 bLF+Be1HV3wvEOt+Ds04jRuFs6vPuQBhA6IWh9BTMxCj4gI1vJm4NbzA+ HzN14ptn+VOj9tnPPf+Xy5kN6eoGpKPUJOumnWPjhtJawvvUDUb267wym Q==; X-IronPort-AV: E=McAfee;i="6600,9927,10962"; a="433286699" X-IronPort-AV: E=Sophos;i="6.05,216,1701158400"; d="scan'208";a="433286699" Received: from orsmga003.jf.intel.com ([10.7.209.27]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 Jan 2024 03:11:13 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10962"; a="736286620" X-IronPort-AV: E=Sophos;i="6.05,216,1701158400"; d="scan'208";a="736286620" Received: from apejovix-mobl1.ger.corp.intel.com (HELO wieczorr-mobl1.intel.com) ([10.213.0.239]) by orsmga003-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 Jan 2024 03:11:10 -0800 From: Maciej Wieczor-Retman To: reinette.chatre@intel.com, fenghua.yu@intel.com, shuah@kernel.org Cc: linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, ilpo.jarvinen@linux.intel.com Subject: [PATCH v3 2/5] selftests/resctrl: Add helpers for the non-contiguous test Date: Thu, 25 Jan 2024 12:10:55 +0100 Message-ID: <85b1efc3ddd698b3ac81aa72a6dc987ee17da3e2.1706180726.git.maciej.wieczor-retman@intel.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 The CAT non-contiguous selftests have to read the file responsible for reporting support of non-contiguous CBMs in kernel (resctrl). Then the test compares if that information matches what is reported by CPUID output. Add a generic helper function to read an unsigned number from a file in /sys/fs/resctrl/info//. Signed-off-by: Maciej Wieczor-Retman --- Changelog v3: - Rewrite patch message. - Add documentation and rewrote the function. (Reinette) Changelog v2: - Add this patch. tools/testing/selftests/resctrl/resctrl.h | 1 + tools/testing/selftests/resctrl/resctrlfs.c | 39 +++++++++++++++++++++ 2 files changed, 40 insertions(+) diff --git a/tools/testing/selftests/resctrl/resctrl.h b/tools/testing/selftests/resctrl/resctrl.h index a1462029998e..5116ea082d03 100644 --- a/tools/testing/selftests/resctrl/resctrl.h +++ b/tools/testing/selftests/resctrl/resctrl.h @@ -162,6 +162,7 @@ unsigned int count_contiguous_bits(unsigned long val, unsigned int *start); int get_full_cbm(const char *cache_type, unsigned long *mask); int get_mask_no_shareable(const char *cache_type, unsigned long *mask); int get_cache_size(int cpu_no, const char *cache_type, unsigned long *cache_size); +int resource_info_unsigned_get(const char *resource, const char *filename, unsigned int *val); void ctrlc_handler(int signum, siginfo_t *info, void *ptr); int signal_handler_register(void); void signal_handler_unregister(void); diff --git a/tools/testing/selftests/resctrl/resctrlfs.c b/tools/testing/selftests/resctrl/resctrlfs.c index 5750662cce57..cb5147c5f9a9 100644 --- a/tools/testing/selftests/resctrl/resctrlfs.c +++ b/tools/testing/selftests/resctrl/resctrlfs.c @@ -249,6 +249,45 @@ static int get_bit_mask(const char *filename, unsigned long *mask) return 0; } +/* + * resource_info_unsigned_get - Read an unsigned value from a file in + * /sys/fs/resctrl/info/RESOURCE/FILENAME + * @resource: Resource name that matches directory names in + * /sys/fs/resctrl/info + * @filename: Filename of a file located in a directory specified with the + * 'resource' variable. + * @val: Variable where the read value is saved on success. + * + * Return: = 0 on success, < 0 on failure. On success the read value is saved into the 'val' + * variable. + */ +int resource_info_unsigned_get(const char *resource, const char *filename, + unsigned int *val) +{ + char reason[128], file_path[PATH_MAX]; + FILE *fp; + + snprintf(file_path, sizeof(file_path), "%s/%s/%s", INFO_PATH, resource, + filename); + + fp = fopen(file_path, "r"); + if (!fp) { + snprintf(reason, sizeof(reason), "Error in opening %s file\n", filename); + ksft_perror(reason); + return -1; + } + + if (fscanf(fp, "%u", val) <= 0) { + snprintf(reason, sizeof(reason), "Could not get %s's contents\n", filename); + ksft_perror(reason); + fclose(fp); + return -1; + } + + fclose(fp); + return 0; +} + /* * create_bit_mask- Create bit mask from start, len pair * @start: LSB of the mask