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Thu, 27 Jun 2024 01:09:58 +0000 Date: Wed, 26 Jun 2024 18:09:55 -0700 From: Dan Williams To: "Fabio M. De Francesco" , "Alison Schofield" , Dan Williams CC: Davidlohr Bueso , Jonathan Cameron , Dave Jiang , "Vishal Verma" , Ira Weiny , "Dan Williams" , , Subject: Re: [PATCH] cxl/acpi: Warn on unsupported platform config detection Message-ID: <667cbbe3139b7_4fe7f294b5@dwillia2-xfh.jf.intel.com.notmuch> References: <20240619125949.167936-1-fabio.m.de.francesco@linux.intel.com> <667b649a3a2d_5639294a3@dwillia2-xfh.jf.intel.com.notmuch> <5714543.ZASKD2KPVS@fdefranc-mobl3> Content-Type: text/plain; charset="utf-8" Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <5714543.ZASKD2KPVS@fdefranc-mobl3> X-ClientProxiedBy: MW4PR03CA0246.namprd03.prod.outlook.com (2603:10b6:303:b4::11) To PH8PR11MB8107.namprd11.prod.outlook.com (2603:10b6:510:256::6) Precedence: bulk X-Mailing-List: linux-cxl@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PH8PR11MB8107:EE_|PH7PR11MB7124:EE_ X-MS-Office365-Filtering-Correlation-Id: 1cad4c50-70b1-42bf-6f7b-08dc9645dc9c X-LD-Processed: 46c98d88-e344-4ed4-8496-4ed7712e255d,ExtAddr X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|376014|1800799024; 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De Francesco wrote: > On Wednesday, June 26, 2024 2:45:14 AM GMT+2 Dan Williams wrote: > > Alison Schofield wrote: > > > On Wed, Jun 19, 2024 at 02:59:41PM +0200, Fabio M. De Francesco wrote: > > > > > > Fabio, > > > > > > cxl/acpi does a lot of platform config work. "...unsupported platform > > > config detection" gives no hint that this is about CHBS's or an eRCD. > > > Please offer something more specific. Thanks. > > > > The message specifies "mixed Virtual Host and Restricted CXL Host > > hierarchy" as the conflict. The relationship between RCH and eRCDs is an > > exercise for the reader, and CHBS is an ACPI detail that really should > > not be emitted in an error message. So I am struggling to imagine what a > > more specific error message would be without paragraphs of backstory. > > > > All that is needed here is just enough words for when someone posts a > > problem to the list that someone savvy can go "ah, you fell into this > > specification hole where CXL 2.0 root port registers are difficult to > > associate with an RCH config, thanks for the report now we know that > > Linux needs to worry about this case". > > > I think that Alison raised a good point. > > If you have nothing against it, I'll change the subject line to: "cxl/acpi: > Warn on mixed VH and eRCH hierarchies" > > How about that change? Just, s/eRCH/RCH/, but other than that looks fine to me. However, I thought this comment was about the error message not the patch subject.