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Wed, 3 Dec 2025 03:38:26 +0000 Date: Tue, 2 Dec 2025 19:38:18 -0800 From: Alison Schofield To: Pawel Mielimonka CC: , , , , , , , , Subject: Re: [RFC PATCH v1 0/2] cxl/cli: HPA-ordered destroy-region teardown Message-ID: References: <20251125143826.282312-1-pawel.mielimonka@fujitsu.com> Content-Type: text/plain; charset="utf-8" Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20251125143826.282312-1-pawel.mielimonka@fujitsu.com> X-ClientProxiedBy: BYAPR05CA0103.namprd05.prod.outlook.com (2603:10b6:a03:e0::44) To DS4PPF0BAC23327.namprd11.prod.outlook.com (2603:10b6:f:fc02::9) 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: DS4PPF0BAC23327:EE_|PH7PR11MB6354:EE_ X-MS-Office365-Filtering-Correlation-Id: e92a31ad-5432-4d27-c6a0-08de321d6aab X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|376014|1800799024; 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Practically, this means that > region teardown must follow HPA-descending order and must stop as soon > as a gap in the requested suffix is encountered. > > The patch introduces destroy_multiple_regions(), which collects all > regions under a given root decoder, sorts them by HPA, and destroys > only the suffix requested by the user (or all regions in the case of > “all”). The implementation guarantees that only valid teardown > sequences are attempted and prevents decoder state inconsistencies > observed during repeated destroy/create cycles. > > Enable/disable paths and all existing bus/port/decoder filtering > remain unchanged. Hi Pawel, Thanks - this is much needed! It's very valuable that now trying to destroy any region out of order will fail 'gracefully'. This worked for 'all' and needs a small fixup for the decoder option. That's noted in Patch 2 reply. I didn't test the other filtering yet but started updating a unit test to cover these cases. See https://github.com/pmem/ndctl/blob/main/CONTRIBUTING.md for a few housekeeping tips on submitting to NDCTL. -- Alison > > Pawel Mielimonka (2): > cxl/cli: add helpers to collect and sort regions by HPA > cxl/cli: enforce HPA-descending teardown order for destroy-region > > cxl/region.c | 114 +++++++++++++++++++++++++++++++++++++++++++++++++-- > 1 file changed, 111 insertions(+), 3 deletions(-) > > -- > 2.45.1.windows.1 > >