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Fri, 12 Jun 2026 18:16:05 +0000 Date: Fri, 12 Jun 2026 11:16:00 -0700 From: Alison Schofield To: Richard Cheng CC: , , , , , , , , , , , , , Subject: Re: [PATCH v4 2/2] tools/testing/cxl: Enable zero sized decoder under hb0 Message-ID: References: <20260607081345.61954-1-icheng@nvidia.com> <20260607081345.61954-3-icheng@nvidia.com> Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20260607081345.61954-3-icheng@nvidia.com> X-ClientProxiedBy: SJ0PR05CA0047.namprd05.prod.outlook.com (2603:10b6:a03:33f::22) To DS4PPF0BAC23327.namprd11.prod.outlook.com (2603:10b6:f:fc02::9) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS4PPF0BAC23327:EE_|SA2PR11MB5180:EE_ X-MS-Office365-Filtering-Correlation-Id: 02ce51e6-1ced-4064-99be-08dec8aeaaa6 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|1800799024|7416014|366016|23010399003|6133799003|18002099003|22082099003|56012099006|11063799006|4143699003; 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cxl_test needs to exercise that path. > > Add a mock_zero_size_decoders module parameter (default off). When set, > the special endpoints under host-bridge0 (cxl_mem.0 and cxl_mem.4) commit > decoders 1 and 2 as zero-size + locked above the decoder[0] auto-region, > mirrored on the parent switch and host bridge. commit_end then lands on a > decoder with no DPA resource, exercising the new enumeration and > poison-by-endpoint paths. > > Gating keeps the default topology, shared by the rest of the cxl suite, > unchanged. Can you add a unit test case for this? I think it makes sense in cxl-topology.sh. Perhaps before or after the work on the default cxl-test topology, load this new topo up and validate the zero size decoders are as expected.