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De Francesco" , Terry Bowman , Joshua Hahn , Robert Richter Subject: [PATCH v4 11/14] cxl/atl: Lock decoders that need address translation Date: Mon, 3 Nov 2025 19:47:52 +0100 Message-ID: <20251103184804.509762-12-rrichter@amd.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20251103184804.509762-1-rrichter@amd.com> References: <20251103184804.509762-1-rrichter@amd.com> Precedence: bulk X-Mailing-List: linux-cxl@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain 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: BL6PEPF00022572:EE_|PH8PR12MB7349:EE_ X-MS-Office365-Filtering-Correlation-Id: 49b43941-7602-467e-a797-08de1b09bee8 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|36860700013|7416014|376014|1800799024; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?a7svI22co2l0pjzb6wBMtkn9tV+Aovx7YIjdQrwsMZnJRcrZCiFn2ME7V2O7?= =?us-ascii?Q?suBltz6mjShWQGDgtoeM7L6BS9U89oR4BOKYwq9CeqMggqsxWOI7JrpKAzyR?= =?us-ascii?Q?eoynbweL5fdnPMEvQ6p0AXqfvOQJ5HPn4v5MlOUqlz7LjJ6ocNv17ktefwgW?= =?us-ascii?Q?3RQeGpcM44SIbnQtoNPgEfYCPBzmOM4uaV4Dqnj/wd42B9W5rtbPwL+RAghj?= =?us-ascii?Q?qkc30aiNcZRtN4SjktYvj1GQGwfCZD7hLfbggNDd926jRckeQSkPuHo/Ux/7?= =?us-ascii?Q?ls4XvEDMatdUw24Tag+B7IUvU0ZCpRlku2VZW6vneO72m9PlHfwQpfZOIUh7?= =?us-ascii?Q?lQMWBJINGZ6GMO2kWQ2NOE3n1ao39oDWuJKaobi84qRxuA77znM1h8GAfT+/?= =?us-ascii?Q?MbqlspI/bJpstnEOb/Xzqv4eZYFcZh1V6GozotmM77epxAvhaBioc+WOgD+Q?= =?us-ascii?Q?DYt/42POd55Rio1JI9E5wZ8UWlNEWr4RBWG56bA7k2zdd+KErIqbI7989+of?= =?us-ascii?Q?y6lGXK7VaN6BHhOs2oi5WtHWQ8EDjaqIcWTF9wiMlyG981M2q4V65st6Flpm?= =?us-ascii?Q?1zx/rHn5RG/5QPWRBGqmv2TRXzimtBpIt/kfA8almS7HsFvlf/g/z8A5Jr4S?= =?us-ascii?Q?6aPGJe5Xz3Bvy+K6ban3jhltXwvNiqSSNYD9yZd1LXmk3N2DpblaKDvLVYLI?= =?us-ascii?Q?5Hpp3v2ubT/I5sbBLvbI02wlU15SeJohsAVG3cxc6vf0m+0fAZIbSMHJuQGl?= =?us-ascii?Q?bbQ9VWvOop8TYFtpTjjIp9IdQr4EokLJ4HpjmLvucBUPsPNntHdjRfAnBYmX?= =?us-ascii?Q?wfwLYTVZuuHmaiVcZnQb2S1dCfghqDqS3uzWc6KGf5mC0QOx9r9e1631iSmK?= =?us-ascii?Q?NTvaACcP4jPeKFqqr10ukvf1AXidLicgOIu+jMlRuzcHllefXUhZGGsf0ING?= =?us-ascii?Q?/ZkYdP3gtD5ukSYWdSbLxO8ksPzJUI+VX3qa1UQ/q6b+XAelVpWxxypzcGF6?= =?us-ascii?Q?9fJTrNNvfre8WomOSJBKVuHjlynPNmtpmrBOv1z93iaT6dgYA9/heosi2/HO?= =?us-ascii?Q?nYjNkb84tDO9AZmY4hqy4fYIXkoFYNTbr/Pfknrk74c6n8+0TzzyQqPVzyUO?= =?us-ascii?Q?SagID8zkryjZRlnN82E39bJI1EQX2GLBW4QYSwc+NJyC2UYZqUYAXFvhb28s?= =?us-ascii?Q?VkgI6/L0uBtBwd/00SxNeaygfjJkH77MfvP/ICcQp5ifkvmhEyXRdTl11POA?= =?us-ascii?Q?ScFlvl2ByUWhY1txWCvQ9raOdqN5mw3/O4OZznhpd181UGQlH+G5fUFOqR+B?= =?us-ascii?Q?SiPzX8kZMieYwdCs0YSLXeG6Dc5Ts34V5l+b0CxU1SHdOFiK02xb4g/dN3I/?= =?us-ascii?Q?YuJsHctpmhSzBJEvSJ529xbTH3Du744supg9nU4bblXzahFnH3TZYh32J8Sk?= =?us-ascii?Q?2P0mbw1j4A/urFRbtx99Sa1DAxalaA5rqIaXc8gjlBNSylkwqfcM4DW5jzvx?= =?us-ascii?Q?vmWIGDaVsP5vGZO6JamGMTNT9qeZYcfegHhAPPEIgpH3S1jmBuhCJwifvQr7?= =?us-ascii?Q?OLBo8Ng91CwucGjcRUc=3D?= 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)(36860700013)(7416014)(376014)(1800799024);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 03 Nov 2025 18:49:40.4332 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 49b43941-7602-467e-a797-08de1b09bee8 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: BL6PEPF00022572.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH8PR12MB7349 There is only support to translate addresses from an endpoint to its CXL host bridge, but not in the opposite direction from the bridge to the endpoint. Thus, the endpoint address range cannot be determined and setup manually for a given SPA range of a region. If the endpoint has address translation enabled, lock it to prevent the kernel from reconfiguring it. Reviewed-by: Gregory Price Signed-off-by: Robert Richter --- drivers/cxl/core/atl.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/cxl/core/atl.c b/drivers/cxl/core/atl.c index d6aa7e6d0ac5..5c15e4d12193 100644 --- a/drivers/cxl/core/atl.c +++ b/drivers/cxl/core/atl.c @@ -158,6 +158,16 @@ static int cxl_prm_translate_hpa_range(struct cxl_root *cxl_root, void *data) return -ENXIO; } + /* + * 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 |= CXL_DECODER_F_LOCK; + ctx->hpa_range = hpa_range; ctx->interleave_ways = ways; ctx->interleave_granularity = gran; -- 2.47.3