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De Francesco" , Terry Bowman , Joshua Hahn , Robert Richter Subject: [PATCH v8 08/13] cxl: Introduce callback for HPA address ranges translation Date: Tue, 9 Dec 2025 19:06:44 +0100 Message-ID: <20251209180659.208842-9-rrichter@amd.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20251209180659.208842-1-rrichter@amd.com> References: <20251209180659.208842-1-rrichter@amd.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: satlexmb08.amd.com (10.181.42.217) To satlexmb07.amd.com (10.181.42.216) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: MWH0EPF000989E6:EE_|DM4PR12MB6135:EE_ X-MS-Office365-Filtering-Correlation-Id: 941406db-9206-4b54-b83c-08de374df39f X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700013|1800799024|376014|7416014|82310400026; X-Microsoft-Antispam-Message-Info: =?utf-8?B?S3pWTzRjUjUrM0N2NW03QnA4bkdDNE1ham1reGJNTjNnVTlEV2c5aGZKbTdB?= =?utf-8?B?aXlkYXRVY0xMS1VwRVdQbS9UOUJtNVhTM1NNV0xIcjBUa2dwVW9oemphQ3B3?= =?utf-8?B?L1IzUFRBVVRrV3RrTTV0WTk0S1NDc0l3V0pDVnZ5UG5HZEtTUWpzTTVlSTNn?= =?utf-8?B?RlBMeW93eEthMXduQy8vYTdoRkdQZ1A2Q0dva0VVOUdqYTFHbHpYYXVFYkxQ?= =?utf-8?B?YU55aDRnbWVkTVdRQXRzZW5yRm41WlZ1VjVMbVZQd3Z5Q3dxQ2RJVXFka3U5?= =?utf-8?B?cUZCVjhGOGJYcXZyek9KaDVGT05KeVBBcG16cXFDa3RuSjk5QXIyQmJXODc2?= =?utf-8?B?TzJUeEhITGc2Q1ZBSkdlNzV5eU9IZktrbVBNcWpJTmtGMmpPdTJPeC9FdHNZ?= =?utf-8?B?ajJoU1Ayb1o0NkhRSk1NWVpNd1Nxbzc3YzJxWDdOaXRuMXFEcUVYUklnSXR6?= =?utf-8?B?cTdjS0ZIUklpTWppN04rVExOVSt0M21UNHV3TDZ4eHVjcVBMME1NR0w2dTF6?= =?utf-8?B?RE12U2MzR0F5ZTMzWVk5WCtnbU9aVElsWExVaHRETlJUWm5PcmJzYnRTVXk4?= =?utf-8?B?VXBZM25PVS9ZVG5CL2RlSWphR1ZyZW5xKzBmSnJwMnpCZjFNNDJSZU13bitr?= =?utf-8?B?Q204K1E5ZjVrTFZ2RENicWd3bmpob3h3bHNDUU5uWnJtK3VrcEpESzFVaE5k?= =?utf-8?B?aW1KbTJpNTg3WnRibnVJa2V3bC9KdXpWUHp1UGEvMVJ5MkUrLzBZN1p2dzRw?= =?utf-8?B?Tkx5bHFUVVFjdVNBUEEzNU9mVXA4TDBBYXpLSlN1Y2JHT29ZNHpSUWxEZlRF?= =?utf-8?B?aXlITUJYWGltTFZ6SXV2Zm05eGI5ZmV3eUdLWEdsSzRSN3JrcW41NFliWUl2?= =?utf-8?B?Z2NkSFZJUjZyaVZIMFJYcHp2S0tQTzVOR2JFUHlDL0h3TWxzVmQvMWQzRjFY?= =?utf-8?B?KyttRmlnVWVWWUt6dzRJbzhzcjIvbEs2SGczeVJ4S1hac3k1R3VxV01KMXRZ?= =?utf-8?B?NHU5bVR5anpWN1Y2bHh5dVdSQVZKcVRlUGZMUnNoMnA2cDlMWWZFdUZrNVVz?= =?utf-8?B?Sis1ZEYyMlZMUUpFSlg4bDlsWGxVSVNzcm5vLzQrc3hEUUkxM0VMSkJMSzIy?= =?utf-8?B?bzl3WEY3QkVNRlp0YVFVRHp4RWtiOE5CQStUcVZEYVJQeWdFY3BJSXJCcVlD?= =?utf-8?B?RGlhY0Q0SHE2Z3YzeEIrMG5RMUZOSjgxNGw5VEtoMHo2QXI4MmdYbEhwQ0pt?= =?utf-8?B?U0lVR3VEMHloU1NYOFp1R2FQeGowSE5qM29YL2p5cXhkbG1PcFBjY1FQanB2?= =?utf-8?B?SmpsUE9NbmFEWVRkbUpoRDNXN3FudEdpVVE0bjdyU21Vc3krbVVsU0M0Si9j?= =?utf-8?B?MCtrc2xXMVdXbE1tdFV3cXlWSDFncnNZOEx0K0l5c2hhTGI0d1VmWU5ucHNH?= =?utf-8?B?cE9WQi9BaW9QT3N1NTRYQ0Y5VmErRysybE84ZGpiNlN6Ty95bWxYUFRwRjZY?= =?utf-8?B?c0Z0bHhIZ0Qzbm4yVGNFaHBxeEFrREhLRnZveHg4eE85b0ZCdWgxbTJBOGlm?= =?utf-8?B?RHlIRzFJYmdESXRQT0Jidm41TUhIR2xnOFhtdmtaVndndW0rTER0dzEvdEQv?= =?utf-8?B?d2I5dlpja1BtYXRVNDVRT3kxNXdROSsxcjZnZWpibEdiUXVyNDJoUjB5bGc4?= =?utf-8?B?cUJ1SCtjQ2dnSzM5cmZGZVY1MlNpTFdlRktZSkZqRURTcHhWNitubXhrWjJ6?= =?utf-8?B?TWhVZkVWZDlyNHFhNFg0MlcrVi9jNkYwZlJZb3QzMEMyK3d0RGJMeitDWjc5?= =?utf-8?B?ZmdIelZKVGZwTVN2b2dnbGFGcHBnblRoV1VIZTNZYzFtNklhZ1diaXRJa0gv?= =?utf-8?B?cTdLRDRYbEVKbm55bGg4bW9JSmRGYTE2MGtTamdNdk8wMnhRMVBDMXNWWTZy?= =?utf-8?B?djR0YVRwTTVybUlUek54UjR2Lzg0MWxiZ3dIVllxemcrb3hVVGc5aUYrS0pH?= =?utf-8?B?VFpydHlCUU4zekxmNXJkUUIxMjYwSVNzYVFhWjg5VmJ2aHExRmtwNndnWWdn?= =?utf-8?B?ZjN5NEFQSEM1TGxSd3dsVXRLUE5LVmZHeEJyRzlHTlAvbTV1UktRUkhPNVhV?= =?utf-8?Q?JsLs=3D?= X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:satlexmb07.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(36860700013)(1800799024)(376014)(7416014)(82310400026);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 Dec 2025 18:08:27.1207 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 941406db-9206-4b54-b83c-08de374df39f X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[satlexmb07.amd.com] X-MS-Exchange-CrossTenant-AuthSource: MWH0EPF000989E6.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR12MB6135 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: Dave Jiang Reviewed-by: Jonathan Cameron Tested-by: Gregory Price Signed-off-by: Robert Richter --- drivers/cxl/core/region.c | 24 ++++++++++++++++++++++++ drivers/cxl/cxl.h | 1 + 2 files changed, 25 insertions(+) diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c index e4efb281def4..c7ac78f1b644 100644 --- a/drivers/cxl/core/region.c +++ b/drivers/cxl/core/region.c @@ -3480,6 +3480,15 @@ static int match_root_decoder(struct device *dev, co= nst void *data) return range_contains(r1, r2); } =20 +static int cxl_root_setup_translation(struct cxl_root *cxl_root, + struct cxl_region_context *ctx) +{ + if (!cxl_root->ops.translation_setup_root) + return 0; + + return cxl_root->ops.translation_setup_root(cxl_root, ctx); +} + /* * Note, when finished with the device, drop the reference with * put_device() or use the put_cxl_root_decoder helper. @@ -3492,6 +3501,21 @@ get_cxl_root_decoder(struct cxl_endpoint_decoder *cx= led, struct cxl_port *port =3D cxled_to_port(cxled); struct cxl_root *cxl_root __free(put_cxl_root) =3D find_cxl_root(port); struct device *cxlrd_dev; + int rc; + + /* + * Adjust the endpoint's HPA range and interleaving + * configuration to the root decoder=E2=80=99s memory space before + * setting up the root decoder. + */ + rc =3D cxl_root_setup_translation(cxl_root, ctx); + if (rc) { + dev_err(cxlmd->dev.parent, + "%s:%s Failed to setup translation for address range %#llx:%#llx\n", + dev_name(&cxlmd->dev), dev_name(&cxled->cxld.dev), + ctx->hpa_range.start, ctx->hpa_range.end); + return ERR_PTR(rc); + } =20 cxlrd_dev =3D device_find_child(&cxl_root->port.dev, &ctx->hpa_range, match_root_decoder); diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h index 0e15dc6e169f..8ea334d81edf 100644 --- a/drivers/cxl/cxl.h +++ b/drivers/cxl/cxl.h @@ -652,6 +652,7 @@ struct cxl_root_ops { int (*qos_class)(struct cxl_root *cxl_root, struct access_coordinate *coord, int entries, int *qos_class); + int (*translation_setup_root)(struct cxl_root *cxl_root, void *data); }; =20 /** --=20 2.47.3