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=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED 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 72ED4C43441 for ; Tue, 13 Nov 2018 21:49:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 34860223C8 for ; Tue, 13 Nov 2018 21:49:46 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 34860223C8 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727080AbeKNHts convert rfc822-to-8bit (ORCPT ); Wed, 14 Nov 2018 02:49:48 -0500 Received: from mga18.intel.com ([134.134.136.126]:25377 "EHLO mga18.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725783AbeKNHts (ORCPT ); Wed, 14 Nov 2018 02:49:48 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by orsmga106.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 13 Nov 2018 13:49:42 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.56,229,1539673200"; d="scan'208";a="280836002" Received: from orsmsx103.amr.corp.intel.com ([10.22.225.130]) by fmsmga006.fm.intel.com with ESMTP; 13 Nov 2018 13:49:41 -0800 Received: from orsmsx105.amr.corp.intel.com ([169.254.2.237]) by ORSMSX103.amr.corp.intel.com ([169.254.5.166]) with mapi id 14.03.0415.000; Tue, 13 Nov 2018 13:49:40 -0800 From: "Yu, Fenghua" To: "Moger, Babu" , "tglx@linutronix.de" , "mingo@redhat.com" , "bp@alien8.de" , "corbet@lwn.net" , "Chatre, Reinette" , "peterz@infradead.org" , "gregkh@linuxfoundation.org" , "davem@davemloft.net" , "akpm@linux-foundation.org" CC: "hpa@zytor.com" , "x86@kernel.org" , "mchehab+samsung@kernel.org" , "arnd@arndb.de" , "kstewart@linuxfoundation.org" , "pombredanne@nexb.com" , "rafael@kernel.org" , "kirill.shutemov@linux.intel.com" , "Luck, Tony" , "qianyue.zj@alibaba-inc.com" , "Shen, Xiaochen" , "pbonzini@redhat.com" , "Singh, Brijesh" , "Hurwitz, Sherry" , "dwmw2@infradead.org" , "Lendacky, Thomas" , "luto@kernel.org" , "joro@8bytes.org" , "jannh@google.com" , "vkuznets@redhat.com" , "rian@alum.mit.edu" , "jpoimboe@redhat.com" , "linux-kernel@vger.kernel.org" , "linux-doc@vger.kernel.org" , "Yu, Fenghua" Subject: RE: [PATCH v7 11/13] arch/x86: Introduce QOS feature for AMD Thread-Topic: [PATCH v7 11/13] arch/x86: Introduce QOS feature for AMD Thread-Index: AQHUeG4uwPRu5I4I10iY3UihB8yywKVOQg0A Date: Tue, 13 Nov 2018 21:49:40 +0000 Message-ID: <3E5A0FA7E9CA944F9D5414FEC6C71220985A6664@ORSMSX105.amr.corp.intel.com> References: <20181109205153.14811-1-babu.moger@amd.com> <20181109205153.14811-12-babu.moger@amd.com> In-Reply-To: <20181109205153.14811-12-babu.moger@amd.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-titus-metadata-40: eyJDYXRlZ29yeUxhYmVscyI6IiIsIk1ldGFkYXRhIjp7Im5zIjoiaHR0cDpcL1wvd3d3LnRpdHVzLmNvbVwvbnNcL0ludGVsMyIsImlkIjoiZjZjYjg2OTItNjZlOC00MjZiLTk2Y2MtZWZhMWU2MThlOGZmIiwicHJvcHMiOlt7Im4iOiJDVFBDbGFzc2lmaWNhdGlvbiIsInZhbHMiOlt7InZhbHVlIjoiQ1RQX05UIn1dfV19LCJTdWJqZWN0TGFiZWxzIjpbXSwiVE1DVmVyc2lvbiI6IjE3LjEwLjE4MDQuNDkiLCJUcnVzdGVkTGFiZWxIYXNoIjoiUUgwM1BHS1ZNY3FEdm1ZTzkwNndQeTZJVXZQWHgwcUI3M1NPajV1enVydUlob3ZGOFBBUlwvZE54clhnK0ZcL2NnIn0= x-ctpclassification: CTP_NT dlp-product: dlpe-windows dlp-version: 11.0.400.15 dlp-reaction: no-action x-originating-ip: [10.22.254.138] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 8BIT MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > From: Moger, Babu [mailto:Babu.Moger@amd.com] > Subject: [PATCH v7 11/13] arch/x86: Introduce QOS feature for AMD > The specification for this feature is available at > https://developer.amd.com/wp-content/resources/56375.pdf > +bool cbm_validate_amd(char *buf, u32 *data, struct rdt_resource *r) { > + if (val > r->default_ctrl) { > + rdt_last_cmd_puts("mask out of range\n"); > + return false; > + } If val is zero, then this closid cannot allocate any cache line. I'm wondering: does that mean the tasks running with this closid directly access memory without cache? Is there any usage for this situation? Thanks. -Fenghua