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Wed, 14 Jan 2026 03:20:07 +0000 Date: Tue, 13 Jan 2026 19:20:04 -0800 From: Alison Schofield To: Robert Richter CC: Vishal Verma , Ira Weiny , Dan Williams , Jonathan Cameron , Dave Jiang , "Davidlohr Bueso" , , , Gregory Price , "Fabio M. De Francesco" , Terry Bowman , Joshua Hahn Subject: Re: [PATCH v9 08/13] cxl: Introduce callback for HPA address ranges translation Message-ID: References: <20260110114705.681676-1-rrichter@amd.com> <20260110114705.681676-9-rrichter@amd.com> Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20260110114705.681676-9-rrichter@amd.com> X-ClientProxiedBy: BY5PR16CA0014.namprd16.prod.outlook.com (2603:10b6:a03:1a0::27) To SJ5PPF0D43D62C4.namprd11.prod.outlook.com (2603:10b6:a0f:fc02::80b) 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: SJ5PPF0D43D62C4:EE_|PH0PR11MB7166:EE_ X-MS-Office365-Filtering-Correlation-Id: 0f60929a-4281-45a9-2a4c-08de531bd157 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|1800799024|366016; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?Z7JVnIm7B4JsVc7dpuRo2RUFHjRmiHI5JqXD9/MShe6Ue+5D2mUPMXs7wp/m?= =?us-ascii?Q?8o1R+Dqk3NL+6b5EKT70VWfLLm6g4sYh0lOxDJIJfj2LSmjPzpFB49pfzW0S?= =?us-ascii?Q?qXcLYgL8VrEyDSEccnH4p0RkfwyERQXLG5s81+ecyS2+/vQXJnTt9ocdDHUW?= =?us-ascii?Q?5Jqy9jFuLWAjSXhxH6+rFRzVTTSIQiSJcxFmTSQkJtNcOczPj5PV+so6r+Fm?= =?us-ascii?Q?BX6W9EopbJ0Of63irMQlZ9aE182/611ZFZ02AK8cQz9HLBmoLtiXqP27rYSC?= =?us-ascii?Q?H8voQVNLhDfh4kXiMPEcO0a4Ziy0YEAopUB5P3KvAfTUIOpMfsPidZh+ynMu?= =?us-ascii?Q?3FUXraG4lynKhF9V0vcteZbrTga4hhhjqujoJyBCEJMKi37pGGd2dQQm2FLd?= =?us-ascii?Q?lHz5RWVWC5plZxd3aOHem9INzxfHPhovgI/3afGs3/1I/TFQyLc8gRn56InD?= =?us-ascii?Q?qEtK8FDxVYHtXzSR4pU+NcKbotid2Dhedbn85L+FQ2j0hlk8buD1ooP7Jspv?= =?us-ascii?Q?Xq/XgcUJ9pDhQCEmvoQrfnPxLWA7uiOKrxcKG4uzbwJfO7zTQ2wFWxudClzP?= =?us-ascii?Q?sH7XcRybnfA7YhV/aGnSH3DMJGQ5F9ich6wT3FI/k8tKBN0RzwaOU9t8dQ2k?= =?us-ascii?Q?tB1QeuuCeHoc3ycbmPfTMFz0yG8h3D/1+b7YsQS/y9Hq7NYBQT7VhE6ZMG0A?= =?us-ascii?Q?FzQDg1GjXxT/lZBVueoykq/CwYQSl8sVIPVzQAeQ78iO+KJWAeC74RNjsRcg?= =?us-ascii?Q?X9wSPwxY4ykxZaFZJL9QhJq4/CGbwHAoIBKCMRv4p7pD0ORsv3l+wNfJedya?= =?us-ascii?Q?0cGlYt1AHvW2C1IP0RZplJW/fBOA48yStcaYqz+iFcs2j+7xDN8CKcMpPiH2?= =?us-ascii?Q?uz9nLAPiF9zwV1Y57ru+aHU2yvN+izZiCWD0YcGSKFyBKWsfTKfzwTUrki1q?= =?us-ascii?Q?DUlEfrW9IvJO6+uzFLQmUCjegy7bh8bKA+K7hdZAazk7Ig6mtNNwZ7QQta87?= =?us-ascii?Q?iyBP1fT31TdehjdypJNVvreLmanuujUDAQugvn13GFSByqvwrkE1Ko7bbuaM?= =?us-ascii?Q?IVXFmreJQj1+3xgGVctX+ZS7K+kfalxFj4XBl3cd2xYaRT7QnltmWWi1SNAv?= =?us-ascii?Q?py74DnEJUvaFuLuO4+9QNMiLGnDdOWy7/HDfDeM99H6D06YXR2aDRRE4bXQY?= =?us-ascii?Q?Qo6m/bMCKPPWCLgHdP93MWZFICBAh36QgKabEKYYCqXi8hAuA73hZCVQUE2L?= =?us-ascii?Q?t6IOBpJ+JtGEkJFq5e03LXedt6aEnDzcKA/QVBz2Z9NVyxiHmeOThZBCCDkF?= =?us-ascii?Q?eSHdeFYZviVdaDcMeEbXLj2FKPrhtS59jD9+ezVRm/OtZ+ngZvmZ8YFv+Abd?= =?us-ascii?Q?HR1bZFLgACUX6AO0MrvV4ScyFF2+cpKYOUokLWRF5XeOmHHcEBUSjfuSA7Ku?= =?us-ascii?Q?UH5D5G0VWWtfF/7trWCH5w6hQd8b7WhE?= X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:SJ5PPF0D43D62C4.namprd11.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(376014)(1800799024)(366016);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?rK+FOw0RgBvM9+T8mnES4NDqSpi8n75XVvTYLlDrMxJGWp7P9O7KPP1Pgeqn?= =?us-ascii?Q?8tu+Qe3uh+1wRfUduoLgO9lRfL10PI5cNnGuYkhCfHWCC63Ndx9xC2AsWTkh?= =?us-ascii?Q?Def4dPLviORndHEeC1FiwZnupF7T5MhFLVNdy+hPnWdXPXJJQiYNoPRzYNBy?= =?us-ascii?Q?LQHQe2GQklk0WuB8nbPkAj8b27leEIdD3K6sYNm5TBIBrsFT2Lhkf+c5F5Ou?= =?us-ascii?Q?QlbyraEtcO5/hh5SEY82lgaFRmzMeKHPNG+oz8IeL3RS+/KwJA2ft328tCyK?= =?us-ascii?Q?mW9Tict1xAwcCWwq29SRwnJgJchpqoemUFrUQ9j/QMZ1mZtRQi854Gokchyk?= =?us-ascii?Q?F7a7D7NNdnC3cXVDUlKrCJB+IcDLOjm/jthwe626uEhFlQfV/rn3Z2uRZ5C9?= =?us-ascii?Q?UDaTMLlXZtTipCUWg2SSvWmzSbOkTBICRdEZaNGOzv+fHqPGqRodAFp7iEBJ?= =?us-ascii?Q?q1GJ2WtaDfNQcn5HZ7DE1nLELB8ivDYp4UullenBVtjLgUooiHeIJHFKb/Q5?= =?us-ascii?Q?X0HcLwkC/VGKeFORsIPa8EyzgAQFNnssoILWEx6kjqPLQmS0Y1tecIn4gjey?= =?us-ascii?Q?QjzHwRDvRPrU4Yej+nyMQ3aaM6iq8KxMKkBIy0gkyBz4YyE0jZ2j6BfH8IBQ?= =?us-ascii?Q?qwlnrFrRYISp58v4YwpOonXBLCgH40xbB9mP8Z6EMjb+Gi3bvy/Xngzyz+iN?= =?us-ascii?Q?7tBcRYlrTcDA81OYls0z3Tl5lAXJ7eeDUQ3etGYFbJ8ETQaMg/D8xaLvIxFt?= =?us-ascii?Q?q6K5mGwlDFuKWSb5Os7oz3zQdUbCfkfolctTbSTHJwTZr7Cci+BRo28oOSEv?= =?us-ascii?Q?M7vh/tx85zqT55TpOabekJ7p45XRMF42qbZki5FTrmC+lUvVOWnhlVGxNl2j?= =?us-ascii?Q?tlqN3m7Or1GBjfsz65V2FpDpm7oH3PmKb2UuhIAbk2xOU1anbij0Gq6FLlDN?= =?us-ascii?Q?+jln7UnH6SFl+MCEtUpqlwo6g9qInDTJIqj9xLZ4OYTrM22NlNV7UYmKt+Qr?= =?us-ascii?Q?oWmiiuM92L9lWJ6haxEcCnyxO9A+Jh4lsezdfGYsK7plnW8/j1eCuQn30FBc?= =?us-ascii?Q?KI7V5wiE6qbP/V5xCs4yxey1dpjoQYlclAagCZpsgt7RALOErAfJI7+WbFy2?= =?us-ascii?Q?ES0j4fUqx8pOnec4rPx1cpXpMSGHW/Eqj/vGvp7rhk5CP3TP7IlQLiJLZdUH?= =?us-ascii?Q?VH9TwYc/R+I362zXzeIkPGwUIOSeQb0d5JBibFAwPR3CEjWxHaNQoP4y31E4?= =?us-ascii?Q?ahgM81DEXVdwMdNIHyVVXrTa3M9a/m/tZb1vWoRLqZscNbhHARrGLBbQ2Bj1?= =?us-ascii?Q?RXr43toGPgX/xLotGOBl1cEhCIA9ShSWnjvK7s1D0ASwrLv5be+/qqiWu9bo?= =?us-ascii?Q?O5pF3Uud5ej9Z0mHjkS2ChTSSu9SGwigv3RN30AAo4UP8ju8eAuBLUzWcjos?= =?us-ascii?Q?U+FDuGEwn1HqzHq/MGhVx2PGgmtx9br3tyRp5L2Oi0AXVcgM/qNVEQ2Eb+kx?= =?us-ascii?Q?CkYhO4IW9sPueNaWOJjLeyZXRjPypLHePXNptMKMWTDyg1Q2hoYN0Ajsb0tk?= =?us-ascii?Q?q2qEJfEimxj3D//gvygTijBOtwvs8Vosd/v0ay43i2zLaBCyR8QQiHe0uYga?= =?us-ascii?Q?Kx/EBahMmAnk2V28IzAtnURoYSmPxbbO78txhynvxIc+62R5LTyN6rjSVWIP?= =?us-ascii?Q?oH8q304KtMioTTOFhrbXYYtr+M0X/sD0BN3rpeIKsd8oQzy1BGbgtTJLJlFm?= =?us-ascii?Q?3vqqkVxhIjNtJ3u6kiFJrpKUp36aTSc=3D?= X-MS-Exchange-CrossTenant-Network-Message-Id: 0f60929a-4281-45a9-2a4c-08de531bd157 X-MS-Exchange-CrossTenant-AuthSource: SJ5PPF0D43D62C4.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 14 Jan 2026 03:20:07.6742 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: xEXhuHK8yP+u9WmB9hbJERwfqsza1hv5X7zXE/CnQZkPsIqIF1uK1JfXbUrRLLQuZRIFmSMl54y+n+Eb+AbF8+t2DPQE/OWA2avUSoAUnNw= X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH0PR11MB7166 X-OriginatorOrg: intel.com On Sat, Jan 10, 2026 at 12:46:53PM +0100, Robert Richter wrote: > Introduce a callback to translate an endpoint's HPA range to the > address range of the root port which is the System Physical Address > (SPA) range used by a region. The callback can be set if a platform > needs to handle address translation. > > The callback is attached to the root port. An endpoint's root port can > easily be determined in the PCI hierarchy without any CXL specific > knowledge. This allows the early use of address translation for CXL > enumeration. Address translation is esp. needed for the detection of > the root decoders. Thus, the callback is embedded in struct > cxl_root_ops instead of struct cxl_rd_ops. Reviewed-by: Alison Schofield