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Sat, 10 Feb 2024 06:39:39 +0000 Date: Fri, 9 Feb 2024 22:39:37 -0800 From: Dan Williams To: Shiyang Ruan , , CC: , Subject: RE: [RFC PATCH 2/5] cxl/core: introduce cxl_memdev_dpa_to_hpa() Message-ID: <65c71a295f47f_d2d42942c@dwillia2-xfh.jf.intel.com.notmuch> References: <20240209115417.724638-1-ruansy.fnst@fujitsu.com> <20240209115417.724638-5-ruansy.fnst@fujitsu.com> Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20240209115417.724638-5-ruansy.fnst@fujitsu.com> X-ClientProxiedBy: MW4PR04CA0161.namprd04.prod.outlook.com (2603:10b6:303:85::16) 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_|PH7PR11MB6032:EE_ X-MS-Office365-Filtering-Correlation-Id: d93180b4-8227-4c61-4df5-08dc2a030e4f X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?z18/UonYCXjXwotV8ROoaSbOkB//ta66HIrVYXqw/4p/24FjRPk31CpCWKpp?= =?us-ascii?Q?OKcph+yjS5XR5bbr1a4HZ/1QpjuFJRuNm/M6FUSTSZW30M6naH3vnc88zpMF?= =?us-ascii?Q?c0NIXE9I9lRUw/2NO3KxzrK2U03m1kcR0viIxuf8agoBt9ZMJ5GJtcMcKcai?= =?us-ascii?Q?95fKI2WZqtH48RSzuFXeaQlcePYMb/jMvT9bcWdFSvpTIXqrqZqK5wt+zf6f?= =?us-ascii?Q?IY9KBg24MHzZgQaIuw8paIad1ynKlsAcllF2JVjgzPPctANHDUclQQBF6NQ3?= =?us-ascii?Q?BBa851uDhNzSR2L784Oh6PEjZ9thKAWMrsyD1w9XCgcypxxKlKfVJFLpWBtF?= =?us-ascii?Q?dLzKzDaLaOhBZHFAEe3CoYYIgJ3mrYneLidsg4jiqs1rHAQkaDRqvccBPbxN?= =?us-ascii?Q?AxbwHXapnKMvCnhrYu7hhv1NqykXUoeZIBk/YQ+ukhEMgrL6I48MjK3RczMd?= =?us-ascii?Q?wdFtwcskrmDXdC8ILsqPf41matTNRhOvizhvNdpwRkBXoEt5/1kvGiMV5rAi?= =?us-ascii?Q?V9kcJ4D1qP2mKCKp+AMea+xETL5UeE8LbAfpyBa4LCznVyAdO7M/UBpGdgnN?= =?us-ascii?Q?PXMfOF6uaAALCkw+zDK7uA3KWe7t01M8e2lZXj9JHH0jIIPAqQjNfdj6WnV4?= =?us-ascii?Q?S/WRRW8nBY8pc+XMr9cE1rND/txEZhqctMVSvY6RBFd/m2RvOjGSg3fGQN2W?= =?us-ascii?Q?Scqus+gKIVyVxLIed0EPlsmBDvetYjH4A36ve+pVgZAHAk6OsR2y11y8C0Ub?= =?us-ascii?Q?unFBdkPRqxIkEqkt8hcEQQ3qKufSCYEUDe9oXG2yP/tDUccHscHv0KVHLEZe?= =?us-ascii?Q?SZOMDFeNCz5L90eYbeZogcT7VD3HXkx7N287y2HTrRght4SmVLzR9DfS5xFF?= =?us-ascii?Q?s9M9XuQDFADM5CpHIf1ht+LPUqwOH+4ap6WvI3icjs1mIoe2alqcm3msCdxR?= =?us-ascii?Q?tTPErOFCt4xQTnStyc2nI27OCzSPDfBGqHBegWuRJAuPyk4Tyy2UxRekWfjU?= =?us-ascii?Q?3j3bumyNHh/LrYno6IKda2Gv8btfKksVL+DXbL0MPz5rIgaDMI3TQpw9Ar/T?= =?us-ascii?Q?vrQD5nMywWfLe9DUz/eZjN0OowUkz1XXcao0UVCTpBvItkG8+SvKQGXOvgGS?= =?us-ascii?Q?STdRuJYPWjaome7Jy2pN4toqiMkljrNSNKMmbRS334RobhdQ6uZ7VraF6PlF?= =?us-ascii?Q?1MeKRN1gO6iijG2u50ajnbs9izMNvznk/dHWpALftWgQus/Q+HDlCFCfsz1/?= =?us-ascii?Q?Fu8fGekEJaX/FVaeDIpuAk5nidahtI2qArsFJQpnpgmXLBYRRMCIYyJf6fxA?= =?us-ascii?Q?havzbLhQZ71sgPKUK7LlgZ0+zaW4CZe0Hk/5UNE20qm3ekKBjl/BO88dbfPT?= =?us-ascii?Q?dpMSrj7lhBmGAwlduu6Mx5I4Elv738BxROTTOrVrSY6K23cngeFXDejqb5iH?= =?us-ascii?Q?pnIDZhxm5hk+uXEiDXLu1V6XciL+yhz4j8IQdjKNhkazq5KjW3V0UuO7Gzhf?= =?us-ascii?Q?AL0yd4QV/Dhwsuv0yMush2kDnVfwGRymQ8E4Vb1GxbLAIJNanMEPGGaL+EI7?= =?us-ascii?Q?stxPHdP7UlEhfpwpxtXXmbI531a4upT/HPpqKmgr8WezDahr7gbgrnLmXjIV?= =?us-ascii?Q?SQ=3D=3D?= X-MS-Exchange-CrossTenant-Network-Message-Id: d93180b4-8227-4c61-4df5-08dc2a030e4f X-MS-Exchange-CrossTenant-AuthSource: PH8PR11MB8107.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Feb 2024 06:39:39.4170 (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: Y6L9OYk1filfmSIE2e0+MULIj8xZ0kHKzyfWFGW5kpbf1AhZa+k1fBoEJlvms3q7CKHkTYrz2M0WQRQFPOTwZVZy1u0ygVCL1kTygPGGYmY= X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR11MB6032 X-OriginatorOrg: intel.com Shiyang Ruan wrote: > When a memdev is assigned to a region, its Device Physical Address will be > mapped to Host Physical Address. Introduce this helper function to > translate HPA from a given memdev and its DPA. > > Signed-off-by: Shiyang Ruan > --- > drivers/cxl/core/memdev.c | 12 ++++++++++++ > drivers/cxl/cxlmem.h | 1 + > 2 files changed, 13 insertions(+) > > diff --git a/drivers/cxl/core/memdev.c b/drivers/cxl/core/memdev.c > index dae8802ecdb0..c304e709ef0e 100644 > --- a/drivers/cxl/core/memdev.c > +++ b/drivers/cxl/core/memdev.c > @@ -319,6 +319,18 @@ static int cxl_validate_poison_dpa(struct cxl_memdev *cxlmd, u64 dpa) > return 0; > } > > +phys_addr_t cxl_memdev_dpa_to_hpa(struct cxl_memdev *cxlmd, u64 dpa) > +{ > + struct cxl_region *cxlr = cxl_dpa_to_region(cxlmd, dpa); > + > + if (cxlr) > + return cxlr->params.res->start + dpa; > + else { > + dev_dbg(&cxlmd->dev, "device belongs to no region.\n"); > + return 0; > + } > +} Hmm no, I would not say memdevs are assigned to regions, *endpoint decoders* are assigned to regions. cxl_dpa_to_region() is only an internal helper when the endpoint decoder is unknown. Otherwise endpoint decoders have a direct-link to their region, if mapped. See usage of "cxled->cxld.region".