From patchwork Mon Mar 10 21:03:35 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: 14010710 Received: from NAM12-BN8-obe.outbound.protection.outlook.com (mail-bn8nam12on2074.outbound.protection.outlook.com [40.107.237.74]) (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 28D9B1E835F; Mon, 10 Mar 2025 21:04:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=40.107.237.74 ARC-Seal: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741640663; cv=fail; b=Z3c8kb4x1+QzPPJ0Iy91W28HdMpSYtGn78t6XzO/qQPO98EYCt08O4au3o1y8Q6VDSSxtsO07SQmSXfR5a63+wCT7A9E2ONNaGb2gYACdI8RSjd6l891dj04Q8VqoZ6+lqFOv++jLO5PIm+ewv38Ww/72hZhS86Qji7Jss8uOK8= ARC-Message-Signature: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741640663; c=relaxed/simple; bh=IZlDDA89wTogpnKj4+zXhnJYrfrwsBpuwcfZ4mj78VQ=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=kIQ/xmof+ll2pp4U+GmSN0JS9nF6qGQR26MHuBOJt0U77Zq0qf2tsBvmXMrsxKRv1T9j5M3A085y5zzQTCVoLOGJoxF9qeSovZA7EmZcf1b8T8Rr37CyvY4LVkdkpDLh1o8KLwkI/KCmXzE61SRccPx6YbJZfzGUXW/d+hWIhAY= 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=fwibGEfU; arc=fail smtp.client-ip=40.107.237.74 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="fwibGEfU" ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=rogdD+Lwb99D2ufpyUdsa94p3zD1thyJ//Dj8qundT9oMbRV4Nx9gxEv/lQq5gLOMVqCQ5VqBzgeyqhZfTNN9CEaulct6tWvLhPGUi5g+Op5sNRb0r17Il9K9yGDOnZmQRgQxYvLZWiti2Otszxf59cXCoojX/EgIT2GihM5qhfvNykHgDyHB+QFQcEETKqwfIIZRSy1LtuefxTvKkmqdSkxzDqXXpFbxq/ZIts3d/vci4GYOFoPWTBFOCDdCz49zTUzhPGvPRcbbbbo/EJg3cHAqGQqd5yeMXoL9coEDDFAd/3bLFKYqBZCo9/6xBj5W9ZhYtS5M/ZfH2SoVtdPZw== 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=ZodsISi6aDN9p7SVcn4A48o7yl+V5G3I4T2ZQYePsR4=; b=yalP0LzOEKlxRt1Ou58tAydf48VsH2mnOgu066JjYIJBHh0AqBnPE3I3JKzXgPgsYzG0MNyiBmvH+m6MXPktVQRTJk2d7DqyTC1w2bwZ3Z21ytOLuqvFlySJMcd2GodwXw6ydEJeoJWiE7jHHieiB7Bwkyx1RawOhZu/O8pldKo+j9dpgKxnSnWtuoPy7ahpIBj1aIRhUtNr72FX/yzSkc9oCsaJF1NBrT1OuRZ27RJq/jaXUAsj8svFp67sF0iYrVbXPjWkMcFBs44TdJIgxge8sOGgBiCRLhyXFBcd3YKw0+U+XWIqwUQtbmMCG/K5ngDbTJ0woDAMwEk4ez1zBg== 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=ZodsISi6aDN9p7SVcn4A48o7yl+V5G3I4T2ZQYePsR4=; b=fwibGEfU17YhLg0z8qFA4NESwU4H/g+R2EdvIcBZYjLkHCQcSOQe2rU7edDPrtOw2NnCqsoGbNLUNH2Sf96Wpulza15VtBvsUY0k9aB7efzaDiZPKpeH2FGQwcyc2dkVwPuf8oiebmgvAItTtLb3R0djs4UrzQEB86d5D/O/XEE= Received: from CH0PR04CA0076.namprd04.prod.outlook.com (2603:10b6:610:74::21) by BN7PPF5D27497F1.namprd12.prod.outlook.com (2603:10b6:40f:fc02::6d1) 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 21:04:17 +0000 Received: from CH2PEPF00000147.namprd02.prod.outlook.com (2603:10b6:610:74:cafe::da) by CH0PR04CA0076.outlook.office365.com (2603:10b6:610:74::21) with Microsoft SMTP Server (version=TLS1_3, cipher=TLS_AES_256_GCM_SHA384) id 15.20.8511.27 via Frontend Transport; Mon, 10 Mar 2025 21:04:17 +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=SATLEXMB04.amd.com; pr=C Received: from SATLEXMB04.amd.com (165.204.84.17) by CH2PEPF00000147.mail.protection.outlook.com (10.167.244.104) 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 21:04:17 +0000 Received: from SATLEXMB05.amd.com (10.181.40.146) 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; Mon, 10 Mar 2025 16:04:16 -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 16:04:16 -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 16:04:15 -0500 From: To: , , , , , , , , CC: Alejandro Lucero Subject: [PATCH v11 18/23] cxl: allow region creation by type2 drivers Date: Mon, 10 Mar 2025 21:03:35 +0000 Message-ID: <20250310210340.3234884-19-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: CH2PEPF00000147:EE_|BN7PPF5D27497F1:EE_ X-MS-Office365-Filtering-Correlation-Id: 736f16a1-5056-4d59-cf64-08dd60171ec3 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700013|1800799024|82310400026|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:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(36860700013)(1800799024)(82310400026)(376014);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Mar 2025 21:04:17.2360 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 736f16a1-5056-4d59-cf64-08dd60171ec3 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=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CH2PEPF00000147.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN7PPF5D27497F1 From: Alejandro Lucero Creating a CXL region requires userspace intervention through the cxl sysfs files. Type2 support should allow accelerator drivers to create such cxl region from kernel code. Adding that functionality and integrating it with current support for memory expanders. Based on https://lore.kernel.org/linux-cxl/168592159835.1948938.1647215579839222774.stgit@dwillia2-xfh.jf.intel.com/ Signed-off-by: Alejandro Lucero --- drivers/cxl/core/region.c | 133 +++++++++++++++++++++++++++++++++++--- drivers/cxl/port.c | 5 +- include/cxl/cxl.h | 4 ++ 3 files changed, 133 insertions(+), 9 deletions(-) diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c index e24666a419cd..e6fbe00d0623 100644 --- a/drivers/cxl/core/region.c +++ b/drivers/cxl/core/region.c @@ -2310,6 +2310,17 @@ static int cxl_region_detach(struct cxl_endpoint_decoder *cxled) return rc; } +int cxl_accel_region_detach(struct cxl_endpoint_decoder *cxled) +{ + int rc; + + guard(rwsem_write)(&cxl_region_rwsem); + cxled->part = -1; + rc = cxl_region_detach(cxled); + return rc; +} +EXPORT_SYMBOL_NS_GPL(cxl_accel_region_detach, "CXL"); + void cxl_decoder_kill_region(struct cxl_endpoint_decoder *cxled) { down_write(&cxl_region_rwsem); @@ -2816,6 +2827,14 @@ cxl_find_region_by_name(struct cxl_root_decoder *cxlrd, const char *name) return to_cxl_region(region_dev); } +static void drop_region(struct cxl_region *cxlr) +{ + struct cxl_root_decoder *cxlrd = to_cxl_root_decoder(cxlr->dev.parent); + struct cxl_port *port = cxlrd_to_port(cxlrd); + + devm_release_action(port->uport_dev, unregister_region, cxlr); +} + static ssize_t delete_region_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) @@ -3523,14 +3542,12 @@ static int __construct_region(struct cxl_region *cxlr, return 0; } -/* Establish an empty region covering the given HPA range */ -static struct cxl_region *construct_region(struct cxl_root_decoder *cxlrd, - struct cxl_endpoint_decoder *cxled) +static struct cxl_region *construct_region_begin(struct cxl_root_decoder *cxlrd, + struct cxl_endpoint_decoder *cxled) { struct cxl_memdev *cxlmd = cxled_to_memdev(cxled); - struct cxl_port *port = cxlrd_to_port(cxlrd); struct cxl_dev_state *cxlds = cxlmd->cxlds; - int rc, part = READ_ONCE(cxled->part); + int part = READ_ONCE(cxled->part); struct cxl_region *cxlr; if (part < 0) @@ -3542,13 +3559,23 @@ static struct cxl_region *construct_region(struct cxl_root_decoder *cxlrd, cxled->cxld.target_type); } while (IS_ERR(cxlr) && PTR_ERR(cxlr) == -EBUSY); - if (IS_ERR(cxlr)) { + if (IS_ERR(cxlr)) dev_err(cxlmd->dev.parent, "%s:%s: %s failed assign region: %ld\n", dev_name(&cxlmd->dev), dev_name(&cxled->cxld.dev), __func__, PTR_ERR(cxlr)); - return cxlr; - } + return cxlr; +} + +/* Establish an empty region covering the given HPA range */ +static struct cxl_region *construct_region(struct cxl_root_decoder *cxlrd, + struct cxl_endpoint_decoder *cxled) +{ + struct cxl_port *port = cxlrd_to_port(cxlrd); + struct cxl_region *cxlr; + int rc; + + cxlr = construct_region_begin(cxlrd, cxled); rc = __construct_region(cxlr, cxlrd, cxled); if (rc) { @@ -3559,6 +3586,96 @@ static struct cxl_region *construct_region(struct cxl_root_decoder *cxlrd, return cxlr; } +static struct cxl_region * +__construct_new_region(struct cxl_root_decoder *cxlrd, + struct cxl_endpoint_decoder *cxled, int ways) +{ + struct cxl_memdev *cxlmd = cxled_to_memdev(cxled); + struct cxl_decoder *cxld = &cxlrd->cxlsd.cxld; + struct cxl_region_params *p; + struct cxl_region *cxlr; + int rc; + + cxlr = construct_region_begin(cxlrd, cxled); + if (IS_ERR(cxlr)) + return cxlr; + + guard(rwsem_write)(&cxl_region_rwsem); + + /* + * Sanity check. This should not happen with an accel driver handling + * the region creation. + */ + p = &cxlr->params; + if (p->state >= CXL_CONFIG_INTERLEAVE_ACTIVE) { + dev_err(cxlmd->dev.parent, + "%s:%s: %s unexpected region state\n", + dev_name(&cxlmd->dev), dev_name(&cxled->cxld.dev), + __func__); + rc = -EBUSY; + goto err; + } + + rc = set_interleave_ways(cxlr, ways); + if (rc) + goto err; + + rc = set_interleave_granularity(cxlr, cxld->interleave_granularity); + if (rc) + goto err; + + rc = alloc_hpa(cxlr, resource_size(cxled->dpa_res)); + if (rc) + goto err; + + down_read(&cxl_dpa_rwsem); + rc = cxl_region_attach(cxlr, cxled, 0); + up_read(&cxl_dpa_rwsem); + + if (rc) + goto err; + + rc = cxl_region_decode_commit(cxlr); + if (rc) + goto err; + + p->state = CXL_CONFIG_COMMIT; + + return cxlr; +err: + drop_region(cxlr); + return ERR_PTR(rc); +} + +/** + * cxl_create_region - Establish a region given an endpoint decoder + * @cxlrd: root decoder to allocate HPA + * @cxled: endpoint decoder with reserved DPA capacity + * + * 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_region *cxlr; + + mutex_lock(&cxlrd->range_lock); + cxlr = __construct_new_region(cxlrd, cxled, ways); + mutex_unlock(&cxlrd->range_lock); + + if (IS_ERR(cxlr)) + return cxlr; + + if (device_attach(&cxlr->dev) <= 0) { + dev_err(&cxlr->dev, "failed to create region\n"); + drop_region(cxlr); + return ERR_PTR(-ENODEV); + } + + return cxlr; +} +EXPORT_SYMBOL_NS_GPL(cxl_create_region, "CXL"); int cxl_add_to_region(struct cxl_port *root, struct cxl_endpoint_decoder *cxled) { struct cxl_memdev *cxlmd = cxled_to_memdev(cxled); diff --git a/drivers/cxl/port.c b/drivers/cxl/port.c index d2bfd1ff5492..f352f2b1c481 100644 --- a/drivers/cxl/port.c +++ b/drivers/cxl/port.c @@ -33,6 +33,7 @@ static void schedule_detach(void *cxlmd) static int discover_region(struct device *dev, void *root) { struct cxl_endpoint_decoder *cxled; + struct cxl_memdev *cxlmd; int rc; if (!is_endpoint_decoder(dev)) @@ -42,7 +43,9 @@ static int discover_region(struct device *dev, void *root) if ((cxled->cxld.flags & CXL_DECODER_F_ENABLE) == 0) return 0; - if (cxled->state != CXL_DECODER_STATE_AUTO) + cxlmd = cxled_to_memdev(cxled); + if (cxled->state != CXL_DECODER_STATE_AUTO || + cxlmd->cxlds->type == CXL_DEVTYPE_DEVMEM) return 0; /* diff --git a/include/cxl/cxl.h b/include/cxl/cxl.h index d6b2e803e20b..9212d3780a5a 100644 --- a/include/cxl/cxl.h +++ b/include/cxl/cxl.h @@ -259,4 +259,8 @@ struct cxl_endpoint_decoder *cxl_request_dpa(struct cxl_memdev *cxlmd, bool is_ram, 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); + +int cxl_accel_region_detach(struct cxl_endpoint_decoder *cxled); #endif