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De Francesco" , Terry Bowman , Joshua Hahn , Robert Richter Subject: [PATCH v3 09/11] cxl/region: Lock decoders that need address translation Date: Fri, 12 Sep 2025 16:45:11 +0200 Message-ID: <20250912144514.526441-10-rrichter@amd.com> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250912144514.526441-1-rrichter@amd.com> References: <20250912144514.526441-1-rrichter@amd.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: satlexmb07.amd.com (10.181.42.216) To satlexmb07.amd.com (10.181.42.216) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SN1PEPF0002636D:EE_|DM6PR12MB4451:EE_ X-MS-Office365-Filtering-Correlation-Id: adc6e995-1ea5-4045-9aa3-08ddf20b1f7e X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|7416014|1800799024|36860700013|376014; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?c5eR1w1Js3PiGnbCg9i7c2ScQfureja1qNUSZorEt1ZW8e1N0iy/9twI69hV?= =?us-ascii?Q?PpIjOJ8uUt27/iU4akt823sQoTFR6DlwvmDREnty1jp/LGV2jW0CWXJ4m4rR?= =?us-ascii?Q?Sc/7r8peXyrPVaTpKlVt3l9XDfSIqN2vIuuluY7WDovb3YxdxUNak7DPIOkq?= =?us-ascii?Q?Qm9HGHNQprn9plXAVM+/QI0+Itx1S9UZu5Ujq5H+uoDruZt9OoSoR+vgjHG5?= =?us-ascii?Q?HMo8ISQbfServPgK790st3YdqEksrxrVfwJk+R3eVmsVsnzmzW00vQ8HVO3A?= =?us-ascii?Q?1FT4HjsGKvXxuuR+3L/264L5NHmlc0oF7LoV/giH/5PT7NkKMYRXk48sP4IN?= =?us-ascii?Q?fBVLx/MbZGzQst3hqWAPkWHJdTe6+NR+TjW6LQxwN8x1w28V+FBeNsy1+N/w?= =?us-ascii?Q?NlFI0i5d4vMZgDDQ8Zd31gMof+R3adeGdLsnLuHYsgVs5scN0w2zUxq3wQ9K?= =?us-ascii?Q?BrmAjQK7hDWhvHktSqGY0w1M7bpfZt4LT4XUGtV34J196BM9811zhCblhUzy?= =?us-ascii?Q?L9lyxTjLWiTbCwv7W1fO0RrRShLV8nwOrv4XvBSYggvZ3ZGHpD+1kVKQCS/e?= =?us-ascii?Q?cUKRVLcLjmGviULNXZd2XlOog8Rg3nDLJoiP7Tc701OZ7kKU+VNNGRS3FxuB?= =?us-ascii?Q?MDAFdEMJFzI/e/mNSoByer/qu7+PY0jFU5j0TEhmD1UTY5odEDF2JXUd+cqr?= =?us-ascii?Q?smbZZJvZ2/jlAKRx/nesGwEGYcy0Tep4gvHrjfeNU1/BxAKYAmSxFBmNiR2v?= =?us-ascii?Q?FYaaJnC/46sCjj5GvlymJYc9W09UZj6Xne856lrRBU46FaND2ihSyHpKKhmu?= =?us-ascii?Q?HfqWYb7OaUXZ4Q8sG3d2+P4+mKLBMO6MnXjGpq2vK/u1rskQRbNDGFV+RSZz?= =?us-ascii?Q?WsG8Qm2Ci8G7XIQDz8RY1HC0Pt2HjJGAergRY1xs/r4TDQI4Abz9oOoEmZBc?= =?us-ascii?Q?y/U5q8RwZJ77nxV5s/U3+O92fKagnx6W5uGGx3q7c2/7Cdxf6aPQUheCSMIM?= =?us-ascii?Q?xz7uekUjBjRiMQurXK2MbIoK7YzmXHaUpCV2/20a8tmMBMQDguk4kXQ600Et?= =?us-ascii?Q?Lm/cU88LoaBBOCJ+gQ5aL/Io+nKZvCC0AgzUqhMgEOHtB791QyzBg+XE7HVX?= =?us-ascii?Q?If84Yhsh5W7huESS2wnKp9HI2dHZivi/N3Bia5QsRXBsdOJrqAqETfeQnZr8?= =?us-ascii?Q?HP0jbfqrQ++U4wt0YIxi/+M3OAcpog2RtBCVSCIcqWkimhPxsaUsHaKWrIqX?= =?us-ascii?Q?FauWhDX4WPmNbvEVKvmjL19vDfu2BnlShURIB+KpCS9E648f71UbVabZ46CD?= =?us-ascii?Q?mhhb/ZQCYlvZn9M7Ho5fTzVHw+aoZ3wyiYkruM967XTJpcwZ2O/wbSWf8pQS?= =?us-ascii?Q?cV6JphXHqAe1hw+y44AftwPAwBrNdgeNy+rP2+PVhmYl1LejdMN/SJapHmgd?= =?us-ascii?Q?XBqFwXJacKRxByRlXMbhizkYmL2lzQhOoaNZpqoUq05mWJbHe7KUa/G4NwYB?= =?us-ascii?Q?B7imShazSM2ufu85CUhD0F+1nVq7XZi0FrOc?= X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:satlexmb07.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(82310400026)(7416014)(1800799024)(36860700013)(376014);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 12 Sep 2025 14:46:14.2687 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: adc6e995-1ea5-4045-9aa3-08ddf20b1f7e 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: SN1PEPF0002636D.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR12MB4451 Content-Type: text/plain; charset="utf-8" There is only support to translate addresses from an endpoint to its parent port, but not in the opposite direction from the parent to the endpoint. Thus, the endpoint address range cannot be determined and setup manually for a given SPA range of a region. If the parent implements the ->to_hpa() callback, address translation is needed. Then, forbid reprogramming of the decoders and lock them. Signed-off-by: Robert Richter Reviewed-by: Gregory Price --- drivers/cxl/core/region.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c index 9fb1e9508213..44ea59252ff0 100644 --- a/drivers/cxl/core/region.c +++ b/drivers/cxl/core/region.c @@ -3497,6 +3497,16 @@ static int setup_address_translation(struct cxl_endp= oint_decoder *cxled, return -ENXIO; } =20 + /* + * There is only support to translate from the endpoint to its + * parent port, but not in the opposite direction from the + * parent to the endpoint. Thus, the endpoint address range + * cannot be determined and setup manually. If the address range + * was translated and modified, forbid reprogramming of the + * decoders and lock them. + */ + cxld->flags |=3D CXL_DECODER_F_LOCK; + ctx->hpa_range =3D range; ctx->interleave_ways =3D ways; ctx->interleave_granularity =3D gran; --=20 2.39.5