From nobody Tue Feb 10 05:17:03 2026 Received: from BN1PR04CU002.outbound.protection.outlook.com (mail-eastus2azon11010040.outbound.protection.outlook.com [52.101.56.40]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4C22132E757; Thu, 22 Jan 2026 04:56:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=52.101.56.40 ARC-Seal: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769057775; cv=fail; b=uQ48eq5ahWRq61aFFdLWT4KLrF/xafV+pcsdoVo3MVhV1ZYvBPOg2DudED65ZvcA92ke5Sk9vQVdEvrpwtBiPHhHcZ2b0994oyjaLDo4sE9K/i/AV4KIv9EVduybdl7F9c3sClbVDQC4YACZeJLlb9CtZLK1Jg4lV6AaZ0Av1hk= ARC-Message-Signature: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769057775; c=relaxed/simple; bh=Yp2RmsT2/A6pqE02FU3hd1IN9L2R6jX8r/GKWSy9Z7M=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=pPa2b3hug3TxgYxUq93Nl/+RZGBUrqkEsLIgGkT2ogr//N7Gxta6VseFHBH5WJVnpyOiW1i5bAM0sBu/sutz8SCU0k+Ph2bp5T2HgzbKqDY3RmtCJETmbKlGO+kQMtg7uQ7VZ+LH3zVERWrfUbNaYtJkaNY694G+69eTo8w9cTM= ARC-Authentication-Results: i=2; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amd.com; spf=fail smtp.mailfrom=amd.com; dkim=pass (1024-bit key) header.d=amd.com header.i=@amd.com header.b=NHtaRJzT; arc=fail smtp.client-ip=52.101.56.40 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amd.com Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=amd.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=amd.com header.i=@amd.com header.b="NHtaRJzT" ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=ML2wO+F/kG6xLAiT/lUnMJAJTo249CmtcAVQJn4Rtsz8YpVFnTQgXeB0wCMLA29VU/nIWP+YJw8Kpg5trx21H5CvcG/B6iWHbJaS0G6mzvIZ0WneBGJ/xmUFjB7tJwu7mTR2E5u6obfNyozeXQCVvkPNTJdIXgx8VXR3Uvh1WqA28SjILZIw3BFT69IWW0K+lcX9poS09Akrgzwl/T4ZUxcJ88rKCpTHr19fLeXuQdxtLQ/CCyBKa5KvWiHw0HC9yfB1oMYScjIEGMLQD8kCaXE5GXROg4onj9pQr7t0Sxzyt2LrpUgNPX+FiCfYEVnSlSGghDSddt+kraqb1TnoFQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=g3nTSAVrzuX2EDjOyZDApiZXz/wmVpFG8hwYvGzVtd8=; b=E4bQFswjsqxuvIjPpheDK+12eABHZs96yuQfsxKTWqk7W+1CrBYqOvYjGDQscY/7ZfQHiCACI7M/ciaBPfKarcNEDhcfadXEv5fTz3x3Tq3YvbwdbIQGHx2T48RlF9Z/put0Ty13YRpyonzExJaxQJSjMpXYkOTuXlBIfusOTengTkEKafihbWXBi7/LMRAv8vR0ATOl2GtuDdgL3ZnvoTr3Yrbn/RLekh/mByVrorVNrP0MKrRh4oeht9Pi4Vs5fbFsd7LualpK3yeKcMsoZxkcY2YkS3In0/LJARtZG8F5ruUNrYENhIuu+fpirjdx09qocSYb8oZlUWPQU3f8xQ== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 165.204.84.17) smtp.rcpttodomain=vger.kernel.org smtp.mailfrom=amd.com; dmarc=pass (p=quarantine sp=quarantine pct=100) action=none header.from=amd.com; dkim=none (message not signed); arc=none (0) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amd.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=g3nTSAVrzuX2EDjOyZDApiZXz/wmVpFG8hwYvGzVtd8=; b=NHtaRJzTjkGNSe4WdPC4+9F47LzJV/UvOj4fU15xG1rEGrivIpIhw54Qcp8BobS3TGa0o172xkN0xqVisv7ONwCXM753+BwDpS77JBRW2wHvYiU4pAZ2fHPioOWIrEmkwBjTDv6dc/EC3I5zzqC5F2/er33P47y6GfINQDGq1EM= Received: from CH3P221CA0026.NAMP221.PROD.OUTLOOK.COM (2603:10b6:610:1e7::27) by IA1PR12MB9529.namprd12.prod.outlook.com (2603:10b6:208:592::17) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9542.9; Thu, 22 Jan 2026 04:56:03 +0000 Received: from DS3PEPF000099E1.namprd04.prod.outlook.com (2603:10b6:610:1e7:cafe::ad) by CH3P221CA0026.outlook.office365.com (2603:10b6:610:1e7::27) with Microsoft SMTP Server (version=TLS1_3, cipher=TLS_AES_256_GCM_SHA384) id 15.20.9542.11 via Frontend Transport; Thu, 22 Jan 2026 04:56:03 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 165.204.84.17) smtp.mailfrom=amd.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=amd.com; Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=satlexmb07.amd.com; pr=C Received: from satlexmb07.amd.com (165.204.84.17) by DS3PEPF000099E1.mail.protection.outlook.com (10.167.17.196) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9542.4 via Frontend Transport; Thu, 22 Jan 2026 04:56:02 +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; Wed, 21 Jan 2026 22:56:00 -0600 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 v5 7/7] dax/hmem: Reintroduce Soft Reserved ranges back into the iomem tree Date: Thu, 22 Jan 2026 04:55:43 +0000 Message-ID: <20260122045543.218194-8-Smita.KoralahalliChannabasappa@amd.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20260122045543.218194-1-Smita.KoralahalliChannabasappa@amd.com> References: <20260122045543.218194-1-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: DS3PEPF000099E1:EE_|IA1PR12MB9529:EE_ X-MS-Office365-Filtering-Correlation-Id: dfe248b8-4c8a-41cb-3e84-08de59728ae7 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|36860700013|82310400026|376014|7416014|13003099007; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?QzWNTBK/3cVNexX9wt182EZkrRhPkfSzavty3AsoiO9ah7F7i2XWLpMbwcjB?= =?us-ascii?Q?jhSbuAsETDrgvpiSe7kBahjYHAJ98rQymeb/1/wLeQLfXT2fT67zli78O6Ql?= =?us-ascii?Q?d5Vf6XEmYiqx5wKD/awWHYZaMG5WAKLTo5YPRHgwpWs6rMwwHxlfZK9wttrJ?= =?us-ascii?Q?B/petbumfb7NsVQFm5ZWR4X4bCPQnWRAN/ARFA5xodrqZ00ELCOxEmwGhRHj?= =?us-ascii?Q?hKYvZDW2oXrrWiVcTF14e1qx+GSjHPxFdbciLAWysf89u7QEsaEvNZ6Ks5wY?= =?us-ascii?Q?HF+wshUrBtljR82qfP9IvsIH/wG/F5f5XPXmk4K/E1Sg9ADexMyCKGMBicS8?= =?us-ascii?Q?sll6VtyLjXbEwR46vWc92Uc5qoJZ8Ese/7+tuKHjogbl9hVLAMZhiW7eNutK?= =?us-ascii?Q?GmlnXE6alRrWyb9mp1oLbu0a/+zIza86BJw/TW1myCNmp1nFIwYCrfFT8HRS?= =?us-ascii?Q?cznawrRx6K63hH9ubQ1B6nxgi4/PgA4RLqtLCFMGcrkylw5uE5D6ASCRk8TK?= =?us-ascii?Q?YUmrsMW2+YdcIfoDdHeBnWZ2+sXdBFzLd1pfHKPfaPcmFADka7QgCH+2w8LV?= =?us-ascii?Q?tSaPVKKOZEJBIOxUaz5gFCq7Us8gejPhvmhTBkahCoqsnxxznQveKTUcZlUc?= =?us-ascii?Q?C9dX+7T/jS0/iKpK9tboLHelOtTtthP4xjjPEFPOxDC37wGzlExKdXAri6g/?= =?us-ascii?Q?HOzlpIlpjsbX0uysz5QX4XfMMH6e581WHfWB0hJNCNqu+aRvhG+DQmz6tD5A?= =?us-ascii?Q?TBvmC47Uoa4ElQawPje6Q7ApILBjAxQZfedaeebNqVZF/kpuNqJtrCG34lB3?= =?us-ascii?Q?C9B3SioChBEbYZg4etzK7iIgVLWEoHighKLJUbFK8eThryfcZHoybed4qe96?= =?us-ascii?Q?B23l0fMPixm5LnxrBvY9hJzaiX0S4x65qqj2U/Z+jQDPdlay3lLG+2aUYLW4?= =?us-ascii?Q?VCefw7r8dd67rDuAMIJqVoMcgursNHlHMEgzwlR6cTANJtVL6mtgQ3zIFV3X?= =?us-ascii?Q?ZskwJDiv13zSITljRlvE6CvKek/X3nIZzGTB4FZtcj2rnmSbIx1CV3p3fuW2?= =?us-ascii?Q?I5YLc5BBHKtq3EAXLKdw+krIoq3J/SnyVLF3osiJphXm8aLxOarHxlzBhNG7?= =?us-ascii?Q?d2lGnLK/9am0fQqyf0QPQSR2V7kXKPlY9XZG19fqhS3nFJ4HiT/apHNtd+c2?= =?us-ascii?Q?Dm/O69wTi9ASwSqK8i3yCCN8llO9+d64lj+YNTCKeows+ti3g6anEDrxc/te?= =?us-ascii?Q?k9ZpVMC/3obF7JsdXlTVqDOt8XFFeSEYXL3w4dT/CQS8n5eTmzWjZRWuajSH?= =?us-ascii?Q?WkcLAEvUwaUjoYzVxVo2BxxpmScwSdw3A+xtgtCA2Mtv4ccS0v9ku439xxfh?= =?us-ascii?Q?9HDZuQQKq1V1X1jJEqbBZ3vA3CZqzgmGnQ24+tCbbXQav+4XhxI92nE5Tqf0?= =?us-ascii?Q?GQU/S7BBCGnaQx3JWyVxFfCnZFXWuNSc1A++NMdz2fJYm43okHzoL6ghPvUq?= =?us-ascii?Q?iNOMpjnOiu1sfl0O9uGz3Dcwn6CskTjqyW+fQGrC3FVZBL4v2HeE+7rTlAH2?= =?us-ascii?Q?F3lvfWpDDLj1XDw3lvsAkSvCVmr/DQE6ELZLAGDn7tr9jUyMQ3nLoV2T0wFk?= =?us-ascii?Q?o7i3UUOQJgC8PV5wSpFMdV6B9U7MHQI2qkbuJJnpq29WrQvmAjKg4onM367w?= =?us-ascii?Q?nKnWVg=3D=3D?= 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)(1800799024)(36860700013)(82310400026)(376014)(7416014)(13003099007);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 22 Jan 2026 04:56:02.4250 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: dfe248b8-4c8a-41cb-3e84-08de59728ae7 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: DS3PEPF000099E1.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA1PR12MB9529 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 | 32 +++++++++++++++++++++++++++++++- 1 file changed, 31 insertions(+), 1 deletion(-) diff --git a/drivers/dax/hmem/hmem.c b/drivers/dax/hmem/hmem.c index bcb57d8678d7..f3ef4faf158f 100644 --- a/drivers/dax/hmem/hmem.c +++ b/drivers/dax/hmem/hmem.c @@ -64,6 +64,34 @@ struct dax_defer_work { struct work_struct 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) +{ + 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) { @@ -94,7 +122,9 @@ static int hmem_register_device(struct device *host, int= 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