From patchwork Mon Mar 10 21:03:36 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Lucero Palau, Alejandro" X-Patchwork-Id: 14010713 Received: from NAM02-BN1-obe.outbound.protection.outlook.com (mail-bn1nam02on2078.outbound.protection.outlook.com [40.107.212.78]) (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 B18831EF37B; Mon, 10 Mar 2025 21:04:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=40.107.212.78 ARC-Seal: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741640666; cv=fail; b=aBH7CnSVeunZJ+pd68f4tBusGvMv9ElBdIuW5Wz7jE93Vu9SDW6FRHwMMbxua2eclNvmDj1DgsmDphTp93Ryo5HTnh31GGM7PplAIU1M2nA5zLTr0QC7uBjIGaUDPK+BemXHRbNkGYsZC5os/OW1TIb7dAdmsh+yQ5uV3ssntyE= ARC-Message-Signature: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741640666; c=relaxed/simple; bh=gcPP27FovahU3/3ERI6OXGtxsmauR2oa6hgUm2Z1mEQ=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=WPkV6NL3JrOEKmmmhc/Fyv7SwMwxKiMXu+krra9+w78/WwZ5XqT8hrozRTcDUb26uOJNR9Ysvxt1odlww2t/q3ccZQF/5RfAzgP7a3m9HxcuZ+hMkp2ChMZvVe+0yAHvzPu51nbg9k4I1L+RBWC/N8vXZd5ZmS7Imk1UN03LxoM= 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=OjDyuV/W; arc=fail smtp.client-ip=40.107.212.78 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="OjDyuV/W" ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=F4A5xXAGJgcmcFSAP7BFqpF51gdxvPTU2cmjtOqMwCzPWNiyu8ac53czqecwj7krhhek/DVXqullPx6SZ8mmEvR5P1KJpXBblu0ebKKE3pYfcgnEfAuaRYOSTx5Fn+5RRMo2bRIW+u9JPL6cnxZBKbUEBQIYmE9IgZgDMH1ybC1DAnA5N4HsT6XvmzaJDKlC38LXHQEKIWYbDZtaXUEIl8LiOfy5mhkbRbYlzKlSAw0EEqPwzuS0Rs11MujZ3WIVjSUtwugqWP9q5NTXvpx/vwtw2VZ3pwQivpw/O2uZ4EuXgMh19DmTd1GCoPWAtdYfA4vpKXoBhFIh3FtcqwIuow== 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=nQDK6LBtBLaWpKS+JpqlMcFHS49iDyfoS3qqXzfd/Z8=; b=Rho7tqONsfAM792Qbv6Okrscf+kuE5ZU7el3CdDpkXKNP+DZS1J6gZSai2QU8X8yhdUJnV13KmTMuUrNEIozzX7suSx0/pzmRRvfLKCdSYfPCXgHiQxqBsEVJhP6Qw2Nr/RidLH/Sog851jhM94iLJwaTXcejDfF6xKjmQsFeEBIWES80wPCnfGNOYVYufk9axa7mjIAuO9jMegsDdhlXJSSQvtLRoYvnpiFD7ItCOGi80GzTfuL7FaQi33m8aRmuW75xGz2QqCGFZDr2iVFRCGcSFZvZO2dS8fINhlvo3d73eZ2YfP9GnEsW64DCcZsBJcWkq1hOCaNcV5dte75Gg== 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=nQDK6LBtBLaWpKS+JpqlMcFHS49iDyfoS3qqXzfd/Z8=; b=OjDyuV/WN2+ySTuZ07obpZ4jOY3x5ohlYnl0xgFLPDTFetc3jK1vopClPBNbPt6FZkXcQvm8mx8aDGZyfaXBdGP+bC8TedGJYtAdc0wzCYx9z5W8yyZXNZBS/iDBa9bgrRQkvybIvdjdWg7zhWC90z7KqPSxmq5xT5nx6XvWsUg= Received: from BYAPR07CA0048.namprd07.prod.outlook.com (2603:10b6:a03:60::25) by CY3PR12MB9577.namprd12.prod.outlook.com (2603:10b6:930:109::10) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8511.27; Mon, 10 Mar 2025 21:04:21 +0000 Received: from SJ5PEPF000001D1.namprd05.prod.outlook.com (2603:10b6:a03:60:cafe::e7) by BYAPR07CA0048.outlook.office365.com (2603:10b6:a03:60::25) with Microsoft SMTP Server (version=TLS1_3, cipher=TLS_AES_256_GCM_SHA384) id 15.20.8511.26 via Frontend Transport; Mon, 10 Mar 2025 21:04:20 +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=SATLEXMB03.amd.com; pr=C Received: from SATLEXMB03.amd.com (165.204.84.17) by SJ5PEPF000001D1.mail.protection.outlook.com (10.167.242.53) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.8534.20 via Frontend Transport; Mon, 10 Mar 2025 21:04:20 +0000 Received: from SATLEXMB05.amd.com (10.181.40.146) by SATLEXMB03.amd.com (10.181.40.144) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.39; Mon, 10 Mar 2025 16:04:18 -0500 Received: from SATLEXMB04.amd.com (10.181.40.145) by SATLEXMB05.amd.com (10.181.40.146) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.39; Mon, 10 Mar 2025 16:04:18 -0500 Received: from xcbalucerop40x.xilinx.com (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.39 via Frontend Transport; Mon, 10 Mar 2025 16:04:16 -0500 From: To: , , , , , , , , CC: Alejandro Lucero , Zhi Wang , "Jonathan Cameron" Subject: [PATCH v11 19/23] cxl: add region flag for precluding a device memory to be used for dax Date: Mon, 10 Mar 2025 21:03:36 +0000 Message-ID: <20250310210340.3234884-20-alejandro.lucero-palau@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20250310210340.3234884-1-alejandro.lucero-palau@amd.com> References: <20250310210340.3234884-1-alejandro.lucero-palau@amd.com> Precedence: bulk X-Mailing-List: linux-cxl@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Received-SPF: None (SATLEXMB05.amd.com: alejandro.lucero-palau@amd.com does not designate permitted sender hosts) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ5PEPF000001D1:EE_|CY3PR12MB9577:EE_ X-MS-Office365-Filtering-Correlation-Id: 4bdb7480-d401-429c-2a48-08dd60172078 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700013|1800799024|82310400026|7416014|376014; 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:CAL;SFV:NSPM;H:SATLEXMB03.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(36860700013)(1800799024)(82310400026)(7416014)(376014);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Mar 2025 21:04:20.0019 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 4bdb7480-d401-429c-2a48-08dd60172078 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=[SATLEXMB03.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SJ5PEPF000001D1.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY3PR12MB9577 From: Alejandro Lucero By definition a type2 cxl device will use the host managed memory for specific functionality, therefore it should not be available to other uses. However, a dax interface could be just good enough in some cases. Add a flag to a cxl region for specifically state to not create a dax device. Allow a Type2 driver to set that flag at region creation time. Signed-off-by: Alejandro Lucero Reviewed-by: Zhi Wang Reviewed-by: Jonathan Cameron Reviewed-by: Ben Cheatham --- drivers/cxl/core/region.c | 10 +++++++++- drivers/cxl/cxl.h | 3 +++ include/cxl/cxl.h | 3 ++- 3 files changed, 14 insertions(+), 2 deletions(-) diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c index e6fbe00d0623..7f832cb1db51 100644 --- a/drivers/cxl/core/region.c +++ b/drivers/cxl/core/region.c @@ -3651,12 +3651,14 @@ __construct_new_region(struct cxl_root_decoder *cxlrd, * cxl_create_region - Establish a region given an endpoint decoder * @cxlrd: root decoder to allocate HPA * @cxled: endpoint decoder with reserved DPA capacity + * @no_dax: if true no DAX device should be created * * Returns a fully formed region in the commit state and attached to the * cxl_region driver. */ struct cxl_region *cxl_create_region(struct cxl_root_decoder *cxlrd, - struct cxl_endpoint_decoder *cxled, int ways) + struct cxl_endpoint_decoder *cxled, int ways, + bool no_dax) { struct cxl_region *cxlr; @@ -3673,6 +3675,9 @@ struct cxl_region *cxl_create_region(struct cxl_root_decoder *cxlrd, return ERR_PTR(-ENODEV); } + if (no_dax) + set_bit(CXL_REGION_F_NO_DAX, &cxlr->flags); + return cxlr; } EXPORT_SYMBOL_NS_GPL(cxl_create_region, "CXL"); @@ -3835,6 +3840,9 @@ static int cxl_region_probe(struct device *dev) if (rc) return rc; + if (test_bit(CXL_REGION_F_NO_DAX, &cxlr->flags)) + return 0; + switch (cxlr->mode) { case CXL_PARTMODE_PMEM: return devm_cxl_add_pmem_region(cxlr); diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h index c35620c24c8f..2eb927c9229c 100644 --- a/drivers/cxl/cxl.h +++ b/drivers/cxl/cxl.h @@ -405,6 +405,9 @@ struct cxl_region_params { */ #define CXL_REGION_F_NEEDS_RESET 1 +/* Allow Type2 drivers to specify if a dax region should not be created. */ +#define CXL_REGION_F_NO_DAX 2 + /** * struct cxl_region - CXL region * @dev: This region's device diff --git a/include/cxl/cxl.h b/include/cxl/cxl.h index 9212d3780a5a..f54d8c72bc79 100644 --- a/include/cxl/cxl.h +++ b/include/cxl/cxl.h @@ -260,7 +260,8 @@ struct cxl_endpoint_decoder *cxl_request_dpa(struct cxl_memdev *cxlmd, resource_size_t alloc); int cxl_dpa_free(struct cxl_endpoint_decoder *cxled); struct cxl_region *cxl_create_region(struct cxl_root_decoder *cxlrd, - struct cxl_endpoint_decoder *cxled, int ways); + struct cxl_endpoint_decoder *cxled, int ways, + bool no_dax); int cxl_accel_region_detach(struct cxl_endpoint_decoder *cxled); #endif