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client-ip=165.204.84.17; helo=satlexmb07.amd.com; pr=C Received: from satlexmb07.amd.com (165.204.84.17) by DS3PEPF0000C37E.mail.protection.outlook.com (10.167.23.8) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9723.19 via Frontend Transport; Sun, 22 Mar 2026 19:54:04 +0000 Received: from ethanolx50f7host.amd.com (10.180.168.240) by satlexmb07.amd.com (10.181.42.216) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.17; Sun, 22 Mar 2026 14:54:01 -0500 From: Smita Koralahalli To: , , , , CC: Ard Biesheuvel , Alison Schofield , Vishal Verma , "Ira Weiny" , Dan Williams , Jonathan Cameron , Yazen Ghannam , Dave Jiang , Davidlohr Bueso , Matthew Wilcox , Jan Kara , "Rafael J . Wysocki" , Len Brown , Pavel Machek , Li Ming , Jeff Johnson , "Ying Huang" , Yao Xingtao , Peter Zijlstra , Greg Kroah-Hartman , Nathan Fontenot , Terry Bowman , Robert Richter , Benjamin Cheatham , Zhijian Li , Borislav Petkov , Smita Koralahalli , Tomasz Wolski Subject: [PATCH v8 9/9] dax/hmem: Reintroduce Soft Reserved ranges back into the iomem tree Date: Sun, 22 Mar 2026 19:53:42 +0000 Message-ID: <20260322195343.206900-10-Smita.KoralahalliChannabasappa@amd.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20260322195343.206900-1-Smita.KoralahalliChannabasappa@amd.com> References: <20260322195343.206900-1-Smita.KoralahalliChannabasappa@amd.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 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: DS3PEPF0000C37E:EE_|LV2PR12MB5989:EE_ X-MS-Office365-Filtering-Correlation-Id: 9db0729a-279d-4fea-e6c6-08de884cc59b X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|82310400026|7416014|1800799024|36860700016|13003099007|56012099003|22082099003|18002099003; X-Microsoft-Antispam-Message-Info: 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 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)(376014)(82310400026)(7416014)(1800799024)(36860700016)(13003099007)(56012099003)(22082099003)(18002099003);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 6a3jV6/SeRU4lhnHYtanlnfyDebfZKFb1jjuuZnjaWjQdd7N5VKlEjbMxz2oaD122LvdcxqKv7a+GExVoaMQsaENBddq+pioWP9Ov4SP4eDdDKiwL2peeI6gprgJ0AEbW93v4HHU2JaK7a32QZs2+zZnCJb7G2t81wkQxy5wHBXs7+4RJ8lG0hAbuqrEp08lK0PN+YsTZkzE3a3othhEkcP2V/2xREKMa5zfM03G5SJvjiox8sVHHCGF4efZHh+IZvhwRaCwMngK4nLvE1mKq+wFrR2MGe5zAISZ7ZPql4SK/bP/eVdIDc9cWcdEFpiJjWxmInUXa1HMsPhnMDcvW8TUoONTnU5iv35Hvy/yhz/L7U9JipBFKDJAoTFITR3eKvCoO1/BM4xGM+CBmC9cGvPLAynKS1TNjiYdNrYtXRYus877AvDWYzKYsc0Jsw51 X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 22 Mar 2026 19:54:04.6884 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 9db0729a-279d-4fea-e6c6-08de884cc59b 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: DS3PEPF0000C37E.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: LV2PR12MB5989 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Reworked from a patch by Alison Schofield Reintroduce Soft Reserved range into the iomem_resource tree for HMEM to consume. This restores visibility in /proc/iomem for ranges actively in use, while avoiding the early-boot conflicts that occurred when Soft Reserved was published into iomem before CXL window and region discovery. Link: https://lore.kernel.org/linux-cxl/29312c0765224ae76862d59a17748c8188f= b95f1.1692638817.git.alison.schofield@intel.com/ Co-developed-by: Alison Schofield Signed-off-by: Alison Schofield Co-developed-by: Zhijian Li Signed-off-by: Zhijian Li Signed-off-by: Smita Koralahalli Reviewed-by: Dave Jiang Reviewed-by: Jonathan Cameron Reviewed-by: Dan Williams --- drivers/dax/hmem/hmem.c | 31 ++++++++++++++++++++++++++++++- 1 file changed, 30 insertions(+), 1 deletion(-) diff --git a/drivers/dax/hmem/hmem.c b/drivers/dax/hmem/hmem.c index 9ceda6b5cadf..b590e1251bb8 100644 --- a/drivers/dax/hmem/hmem.c +++ b/drivers/dax/hmem/hmem.c @@ -76,6 +76,33 @@ void dax_hmem_flush_work(void) } EXPORT_SYMBOL_GPL(dax_hmem_flush_work); =20 +static void remove_soft_reserved(void *r) +{ + remove_resource(r); + kfree(r); +} + +static int add_soft_reserve_into_iomem(struct device *host, + const struct resource *res) +{ + int rc; + + struct resource *soft __free(kfree) =3D kmalloc_obj(*soft); + if (!soft) + return -ENOMEM; + + *soft =3D DEFINE_RES_NAMED_DESC(res->start, (res->end - res->start + 1), + "Soft Reserved", IORESOURCE_MEM, + IORES_DESC_SOFT_RESERVED); + + rc =3D insert_resource(&iomem_resource, soft); + if (rc) + return rc; + + return devm_add_action_or_reset(host, remove_soft_reserved, + no_free_ptr(soft)); +} + static int __hmem_register_device(struct device *host, int target_nid, const struct resource *res) { @@ -88,7 +115,9 @@ static int __hmem_register_device(struct device *host, i= nt target_nid, if (rc !=3D REGION_INTERSECTS) return 0; =20 - /* TODO: Add Soft-Reserved memory back to iomem */ + rc =3D add_soft_reserve_into_iomem(host, res); + if (rc) + return rc; =20 id =3D memregion_alloc(GFP_KERNEL); if (id < 0) { --=20 2.17.1