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Wysocki" , Len Brown , Pavel Machek , Li Ming , Jeff Johnson , "Ying Huang" , Yao Xingtao , Peter Zijlstra , Greg KH , Nathan Fontenot , Smita Koralahalli , Terry Bowman , Robert Richter , Benjamin Cheatham , Zhijian Li , "Borislav Petkov" , Ard Biesheuvel Subject: [PATCH v2 5/5] dax/hmem: Reintroduce Soft Reserved ranges back into the iomem tree Date: Tue, 30 Sep 2025 04:28:14 +0000 Message-ID: <20250930042814.213912-6-Smita.KoralahalliChannabasappa@amd.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20250930042814.213912-1-Smita.KoralahalliChannabasappa@amd.com> References: <20250930042814.213912-1-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: 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: CY4PEPF0000EE3F:EE_|MN0PR12MB6002:EE_ X-MS-Office365-Filtering-Correlation-Id: 49c11f2e-a27a-487f-e7c6-08ddffd9d0b0 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|1800799024|36860700013|7416014|376014|13003099007; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?BMhv/C58fLyIYI4he7xntNUBpSE0uwJAmVMe3YkkZvIUr8tr7WPq+IeaACMN?= =?us-ascii?Q?UGHrcaFU3V0KnPGrMYYLcv0Pmdpo37X6dWafx+BmQVWeT7WmI/d+nJuqIaj4?= =?us-ascii?Q?sITm/8cn2Sdw+nRhznl8WpTUHviD8BLVjcPYLnLgVXvWOwV38T/hnWTXr/Ct?= =?us-ascii?Q?QyRK5WayY9SDgPvb4Cqr4fSWz8pTWVavrfS3ZajnBCezII0dwiSiFHDV5Re0?= =?us-ascii?Q?P9Shr7EYwyOZ7fqk2QvT1XlmG4YdR1aj+gnqB2AjlimoL01AxVTNH187NNiJ?= =?us-ascii?Q?h6JdU8rJiH1O3qssv5paCuff5nCILLyhw1XK/s2VFOeq2EJ/FOhh8sLkzK/Q?= =?us-ascii?Q?LVTV+GWstRW4Bf2CpxK/OMll0Rj4vWffPbQBIJb2jsEAcslJagJTO91DdnfU?= =?us-ascii?Q?LLQJkNqbgxyvNAGr97PcWpcEbNK0MrGa0OdbQRLEVIxW1ZFRRIQvDoy64xv1?= =?us-ascii?Q?x6MRTpKoLabk76LBaooiD4+wZcvk+Qz/VCSpfAIXSkAisQjpyimI3JAwq/vr?= =?us-ascii?Q?NvCVoDo3vdw8d7eG89x9Lg4OWHciJCf1541iNgsFnV2dwvZWuqTE6Ya7U8dm?= =?us-ascii?Q?r32C/xtCJz6z5DztwxImnsgKlecB2SgJUtsjpM9SVb68K3+/9qIhWee+rtR7?= =?us-ascii?Q?BSbEoAuWisyzC0wBWLjIkj/3Xe5Y+yQyjcLXphOxFAmFmLWP7ViLePncGzdW?= =?us-ascii?Q?yDufY2Fho/Z9wwnpkBu8gWX5bLIpQoAwiGMazj3qrNu0FYtCIDTqEEj92oij?= =?us-ascii?Q?CwKaNCehEYkjY8kYEzuPZPWR7fVDHhstezVAsLiCx3Cdf4TcdN9Orq2m4FPp?= =?us-ascii?Q?yYd0OjAJM7Y/MLcNA6LVJFJ80ImFs9aCC5cHYyfRYDVuTytd2Cp1F/LiJIoM?= =?us-ascii?Q?7+cWge7HNLQg73MWV8U5pckLKWzRZupy9M0NHvGOFqsZfCeSy2JzlYSx35oS?= =?us-ascii?Q?PMNGfRo0LfeOtXBq0OkxX/4l2qnmTWyE4b7nC4YLvE0s8RwYGR78kdwsDnVI?= =?us-ascii?Q?tshTvHTMZ3Vv2/f08oWZKG1hREZ6K5whyxjDofdniCKszuaPKSgf2JwobChL?= =?us-ascii?Q?xMynsyFrRSG8KqyKJK+jzRk69A9I6MKLoxuE8fEqm3LLXE24rymDScTgdAHx?= =?us-ascii?Q?wKcRuqHAfds4wPfVjI7FDG29zx5zh8dgHlkGhCiiO5hPKns87sTwdcS5Vbfn?= =?us-ascii?Q?tmv/IONBL95budYdVjhzosKi4rPKPnmGfWnVhKZTUFIEhMATOvbqIZR67QeK?= =?us-ascii?Q?O6UXV+SEqeSMylvt7aPwfg9UjJYEZ5LnUPe0IunfAmU9Z75sRMIu2XK13237?= =?us-ascii?Q?AUqSz0PvKjQWT4J5J8JfUhYEwoABauHy8FhLm3E1VkjM5R74RBk40hJB7agx?= =?us-ascii?Q?TjIDXK8fxirCohc7Zn1vv8Y6HqCuZ/iCvZa6s8zReCyzpH74G0mb21tc2l4Z?= =?us-ascii?Q?ASlipJ20ytzQ0sa5Rntf51v0pMpCW45jWGJ4wbq1vTBzfytGFK/QAIJ9cR2m?= =?us-ascii?Q?mJwd7XFKTuG48aHNAWT2KTjuqcLpNdjaYCNw?= 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)(1800799024)(36860700013)(7416014)(376014)(13003099007);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 30 Sep 2025 04:28:33.0201 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 49c11f2e-a27a-487f-e7c6-08ddffd9d0b0 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: CY4PEPF0000EE3F.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN0PR12MB6002 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 dax_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 --- drivers/dax/hmem/hmem.c | 32 +++++++++++++++++++++++++++++++- 1 file changed, 31 insertions(+), 1 deletion(-) diff --git a/drivers/dax/hmem/hmem.c b/drivers/dax/hmem/hmem.c index 0498cb234c06..9dc6eb15c4d2 100644 --- a/drivers/dax/hmem/hmem.c +++ b/drivers/dax/hmem/hmem.c @@ -93,6 +93,34 @@ static void process_defer_work(struct work_struct *_work) walk_hmem_resources(&pdev->dev, handle_deferred_cxl); } =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) +{ + struct resource *soft __free(kfree) =3D + kzalloc(sizeof(*soft), GFP_KERNEL); + int rc; + + 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) { @@ -125,7 +153,9 @@ static int hmem_register_device(struct device *host, in= t 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