From patchwork Fri Feb 23 08:00:21 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vidya Sagar X-Patchwork-Id: 1903116 Return-Path: X-Original-To: incoming-dt@patchwork.ozlabs.org Delivered-To: patchwork-incoming-dt@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=Nvidia.com header.i=@Nvidia.com header.a=rsa-sha256 header.s=selector2 header.b=t6+3MI2c; dkim-atps=neutral Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=2604:1380:45e3:2400::1; helo=sv.mirrors.kernel.org; envelope-from=devicetree+bounces-45105-incoming-dt=patchwork.ozlabs.org@vger.kernel.org; receiver=patchwork.ozlabs.org) Received: from sv.mirrors.kernel.org (sv.mirrors.kernel.org [IPv6:2604:1380:45e3:2400::1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (secp384r1)) (No client certificate requested) by legolas.ozlabs.org (Postfix) with ESMTPS id 4Th2Wt1B1Gz23l1 for ; Fri, 23 Feb 2024 19:01:14 +1100 (AEDT) Received: from smtp.subspace.kernel.org (wormhole.subspace.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by sv.mirrors.kernel.org (Postfix) with ESMTPS id 876A6284247 for ; Fri, 23 Feb 2024 08:01:12 +0000 (UTC) Received: from localhost.localdomain (localhost.localdomain [127.0.0.1]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 3FC75168C4; Fri, 23 Feb 2024 08:01:06 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=Nvidia.com header.i=@Nvidia.com header.b="t6+3MI2c" X-Original-To: devicetree@vger.kernel.org Received: from NAM04-MW2-obe.outbound.protection.outlook.com (mail-mw2nam04on2056.outbound.protection.outlook.com [40.107.101.56]) (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 861F09455; Fri, 23 Feb 2024 08:01:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=40.107.101.56 ARC-Seal: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708675265; cv=fail; b=V9efAdqIvKcwM8369OI4FJYzxES2257HoGbFkAU7G1pp8uYx6xsQTcEFdWr48XrkmFgR/ILk6JiVkqE+6DPqMQg02ukkQD2lF2A47H7el2kBkMGOXpuFrxZ2oILyWSRxV38PxryIx4RdmYXg7GikSIXOXbH5tqWdseHDHFQdTMo= ARC-Message-Signature: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708675265; c=relaxed/simple; bh=i6wbDy7hv/RL0xCSQmB32T514/A9Ju1Y8CVq8IHZqg0=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=fNVtoJQxKHlRLaXpJKOCrBdrF+zgWYAI6fzBv48VCiIY8FpUB0UxsnkopyvHvdq71YGa4HIHzIgQc64UyOpAaZ1QKbLUo+dN8osak8qdCq1B3qI6LYB8h8oXWAL5h+ZebJW2EZajVZeYpIpFU6yGgEuogrTeV3QfstKgmRmhseg= ARC-Authentication-Results: i=2; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=nvidia.com; spf=fail smtp.mailfrom=nvidia.com; dkim=pass (2048-bit key) header.d=Nvidia.com header.i=@Nvidia.com header.b=t6+3MI2c; arc=fail smtp.client-ip=40.107.101.56 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=nvidia.com Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=nvidia.com ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=BDwGQqGQbapY5ESxPMtYMv0B09abuvgseZmoMIZA+Aiaai/JfPUaTqoWMZ4SfOR16ii3/HGXPDES0V5z+BNhd5BeUd0XPXus/Tf5PP8sFlei9FqkAOpwRSz8k1MstfbDK/gzhT+7o6/5q5vwbdAPWnqngfYwXJLI6g+3m0ZdwEpx+u+dZ+3M53fM44FGmaGMmln8fk1E8KrDqc/ZTAuoz7lSrkzmv72ljXK/pUM7/e2ie78Lk4X8Yf4MjzY4bSUTscBPufIDzbXZbJMrYiVwSOoFJEy0CM7TcWxoDfH7UHJWDfDXgbozKwkjc/K26mn17hs0BXf5vGPhv6Z2oKjAKg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; 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=HU8upKrV3q24FJE1fhuhGdFYswCFBHRRDgJEboD4/9E=; b=ATL+76O0wfnxiRvfm6A7lKUW61L+WGWnXRQbjriFg7gdkRyX4gKL+5e89IEnbBQ02BlmPs+YU53uZpuAhlnApUccB0fO134nj7Y0u4aJ5ZYhjY6XSFu89BIHP6PhKwQLKG7jv9+qg1LaaUVLzWOaz1UbEyT58hAf/dyQM0LmYKEh9FcAn6c4pxx/R67sWqs4l9ZtoWYNw89fM3ytM+a6X7lQnLBVs6fDoMdqMTsKj1AoE0icRm9WzLRMTfmSx4BNifX8f5yrM9rOyaUN37Gf+sO2dLmXTqjheKUtF+w9l1aLsMUURe7Zc7Aq3Ss2hDWd1ujwC9BrHvhzEHRJwCrybA== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 216.228.117.161) smtp.rcpttodomain=google.com smtp.mailfrom=nvidia.com; dmarc=pass (p=reject sp=reject pct=100) action=none header.from=nvidia.com; dkim=none (message not signed); arc=none (0) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=Nvidia.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=HU8upKrV3q24FJE1fhuhGdFYswCFBHRRDgJEboD4/9E=; b=t6+3MI2coVIFvmlqGN2frTyZGZ4NS2EOTTEfU1ql2C7ElDBAcxLzv4Ly+1kN3pdlJbYVoQ8+htkJNTObfHecz/gIohHThsFJrmOwx/tYv5cuYL5ptRzyd6S8v457itTRNh08WPqK0HZ5VHNPeBVdVPCmV1LlQ+fDbXyDkr2Pv5gamh2swXRKF2rsOTKMAh/rQnRSJNCARli797NweY2UDce61B077QVN0MuVPcB6cVY75NxaGUGjElNWKeY2+nida/rMOGP1puUGHOf0W2XVOc97mKmRJoSLTWBhxE7uHPKQoY5a3k9tShUwLI/tYEdZ7Js/yXzEMOBNQ7/o4XBW+Q== Received: from BLAPR03CA0071.namprd03.prod.outlook.com (2603:10b6:208:329::16) by SJ2PR12MB9240.namprd12.prod.outlook.com (2603:10b6:a03:563::13) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7316.24; Fri, 23 Feb 2024 08:01:00 +0000 Received: from BL6PEPF0001AB55.namprd02.prod.outlook.com (2603:10b6:208:329:cafe::7f) by BLAPR03CA0071.outlook.office365.com (2603:10b6:208:329::16) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7292.44 via Frontend Transport; Fri, 23 Feb 2024 08:00:59 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 216.228.117.161) smtp.mailfrom=nvidia.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=nvidia.com; Received-SPF: Pass (protection.outlook.com: domain of nvidia.com designates 216.228.117.161 as permitted sender) receiver=protection.outlook.com; client-ip=216.228.117.161; helo=mail.nvidia.com; pr=C Received: from mail.nvidia.com (216.228.117.161) by BL6PEPF0001AB55.mail.protection.outlook.com (10.167.241.7) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7292.25 via Frontend Transport; Fri, 23 Feb 2024 08:00:59 +0000 Received: from rnnvmail201.nvidia.com (10.129.68.8) by mail.nvidia.com (10.129.200.67) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.41; Fri, 23 Feb 2024 00:00:30 -0800 Received: from rnnvmail203.nvidia.com (10.129.68.9) by rnnvmail201.nvidia.com (10.129.68.8) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1258.12; Fri, 23 Feb 2024 00:00:28 -0800 Received: from vidyas-desktop.nvidia.com (10.127.8.9) by mail.nvidia.com (10.129.68.9) with Microsoft SMTP Server id 15.2.1258.12 via Frontend Transport; Fri, 23 Feb 2024 00:00:24 -0800 From: Vidya Sagar To: , , , , , , , CC: , , , , , , , , , , Subject: [PATCH V4] PCI: Add support for preserving boot configuration Date: Fri, 23 Feb 2024 13:30:21 +0530 Message-ID: <20240223080021.1692996-1-vidyas@nvidia.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20240222124110.2681455-1-vidyas@nvidia.com> References: <20240222124110.2681455-1-vidyas@nvidia.com> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-NVConfidentiality: public X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BL6PEPF0001AB55:EE_|SJ2PR12MB9240:EE_ X-MS-Office365-Filtering-Correlation-Id: 88fc817f-d7f9-4873-a1c8-08dc34459286 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.117.161;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge2.nvidia.com;CAT:NONE;SFS:(13230031)(36860700004)(46966006)(40470700004);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 23 Feb 2024 08:00:59.2171 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 88fc817f-d7f9-4873-a1c8-08dc34459286 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.161];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BL6PEPF0001AB55.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ2PR12MB9240 Add support for preserving the boot configuration done by the platform firmware per host bridge basis, based on the presence of 'linux,pci-probe-only' property in the respective PCI host bridge device-tree node. It also unifies the ACPI and DT based boot flows in this regard. Signed-off-by: Vidya Sagar --- V4: * Addressed Bjorn's review comments V3: * Unified ACPI and DT flows as part of addressing Bjorn's review comments V2: * Addressed issues reported by kernel test robot drivers/acpi/pci_root.c | 12 ------- drivers/pci/controller/pci-host-common.c | 4 --- drivers/pci/of.c | 21 +++++++++++ drivers/pci/probe.c | 46 ++++++++++++++++++------ include/linux/of_pci.h | 6 ++++ 5 files changed, 62 insertions(+), 27 deletions(-) diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c index 84030804a763..ddc2b3e89111 100644 --- a/drivers/acpi/pci_root.c +++ b/drivers/acpi/pci_root.c @@ -1008,7 +1008,6 @@ struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root, int node = acpi_get_node(device->handle); struct pci_bus *bus; struct pci_host_bridge *host_bridge; - union acpi_object *obj; info->root = root; info->bridge = device; @@ -1050,17 +1049,6 @@ struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root, if (!(root->osc_ext_control_set & OSC_CXL_ERROR_REPORTING_CONTROL)) host_bridge->native_cxl_error = 0; - /* - * Evaluate the "PCI Boot Configuration" _DSM Function. If it - * exists and returns 0, we must preserve any PCI resource - * assignments made by firmware for this host bridge. - */ - obj = acpi_evaluate_dsm(ACPI_HANDLE(bus->bridge), &pci_acpi_dsm_guid, 1, - DSM_PCI_PRESERVE_BOOT_CONFIG, NULL); - if (obj && obj->type == ACPI_TYPE_INTEGER && obj->integer.value == 0) - host_bridge->preserve_config = 1; - ACPI_FREE(obj); - acpi_dev_power_up_children_with_adr(device); pci_scan_child_bus(bus); diff --git a/drivers/pci/controller/pci-host-common.c b/drivers/pci/controller/pci-host-common.c index 6be3266cd7b5..e2602e38ae45 100644 --- a/drivers/pci/controller/pci-host-common.c +++ b/drivers/pci/controller/pci-host-common.c @@ -73,10 +73,6 @@ int pci_host_common_probe(struct platform_device *pdev) if (IS_ERR(cfg)) return PTR_ERR(cfg); - /* Do not reassign resources if probe only */ - if (!pci_has_flag(PCI_PROBE_ONLY)) - pci_add_flags(PCI_REASSIGN_ALL_BUS); - bridge->sysdata = cfg; bridge->ops = (struct pci_ops *)&ops->pci_ops; bridge->msi_domain = true; diff --git a/drivers/pci/of.c b/drivers/pci/of.c index 51e3dd0ea5ab..f0f1156040a5 100644 --- a/drivers/pci/of.c +++ b/drivers/pci/of.c @@ -258,6 +258,27 @@ void of_pci_check_probe_only(void) } EXPORT_SYMBOL_GPL(of_pci_check_probe_only); +/** + * of_pci_bridge_preserve_resources - Return true if the boot configuration + * needs to be preserved + * @node: Device tree node with the domain information. + * + * This function looks for "linux,pci-probe-only" property for a given + * PCI controller's node and returns true if found. Having this property + * for a PCI controller ensures that the kernel doesn't reconfigure the + * BARs and bridge windows that are already done by the platform firmware. + * NOTE: The scope of "linux,pci-probe-only" defined within a PCI bridge device + * is limited to the hierarchy under that particular bridge device. whereas + * the scope of "linux,pci-probe-only" defined within chosen node is + * system wide. + * + * Return: true if the property exists false otherwise. + */ +bool of_pci_bridge_preserve_resources(struct device_node *node) +{ + return of_property_read_bool(node, "linux,pci-probe-only"); +} + /** * devm_of_pci_get_host_bridge_resources() - Resource-managed parsing of PCI * host bridge resources from DT diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index 795534589b98..c57648084503 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -15,6 +15,7 @@ #include #include #include +#include #include #include #include @@ -877,6 +878,28 @@ static void pci_set_bus_msi_domain(struct pci_bus *bus) dev_set_msi_domain(&bus->dev, d); } +static void pci_check_config_preserve(struct pci_host_bridge *host_bridge) +{ + if (ACPI_HANDLE(&host_bridge->dev)) { + union acpi_object *obj; + + /* + * Evaluate the "PCI Boot Configuration" _DSM Function. If it + * exists and returns 0, we must preserve any PCI resource + * assignments made by firmware for this host bridge. + */ + obj = acpi_evaluate_dsm(ACPI_HANDLE(&host_bridge->dev), &pci_acpi_dsm_guid, 1, + DSM_PCI_PRESERVE_BOOT_CONFIG, NULL); + if (obj && obj->type == ACPI_TYPE_INTEGER && obj->integer.value == 0) + host_bridge->preserve_config = 1; + ACPI_FREE(obj); + } + + if (host_bridge->dev.parent && host_bridge->dev.parent->of_node) + host_bridge->preserve_config = + of_pci_bridge_preserve_resources(host_bridge->dev.parent->of_node); +} + static int pci_register_host_bridge(struct pci_host_bridge *bridge) { struct device *parent = bridge->dev.parent; @@ -971,6 +994,9 @@ static int pci_register_host_bridge(struct pci_host_bridge *bridge) if (nr_node_ids > 1 && pcibus_to_node(bus) == NUMA_NO_NODE) dev_warn(&bus->dev, "Unknown NUMA node; performance will be reduced\n"); + /* Check if the boot configuration by FW needs to be preserved */ + pci_check_config_preserve(bridge); + /* Coalesce contiguous windows */ resource_list_for_each_entry_safe(window, n, &resources) { if (list_is_last(&window->node, &resources)) @@ -3080,20 +3106,18 @@ int pci_host_probe(struct pci_host_bridge *bridge) bus = bridge->bus; + /* If we must preserve the resource configuration, claim now */ + if (pci_has_flag(PCI_PROBE_ONLY) || bridge->preserve_config) + pci_bus_claim_resources(bus); + /* - * We insert PCI resources into the iomem_resource and - * ioport_resource trees in either pci_bus_claim_resources() - * or pci_bus_assign_resources(). + * Assign whatever was left unassigned. If we didn't claim above, + * this will reassign everything. */ - if (pci_has_flag(PCI_PROBE_ONLY)) { - pci_bus_claim_resources(bus); - } else { - pci_bus_size_bridges(bus); - pci_bus_assign_resources(bus); + pci_assign_unassigned_root_bus_resources(bus); - list_for_each_entry(child, &bus->children, node) - pcie_bus_configure_settings(child); - } + list_for_each_entry(child, &bus->children, node) + pcie_bus_configure_settings(child); pci_bus_add_devices(bus); return 0; diff --git a/include/linux/of_pci.h b/include/linux/of_pci.h index 29658c0ee71f..3f3909a5d55d 100644 --- a/include/linux/of_pci.h +++ b/include/linux/of_pci.h @@ -13,6 +13,7 @@ struct device_node *of_pci_find_child_device(struct device_node *parent, unsigned int devfn); int of_pci_get_devfn(struct device_node *np); void of_pci_check_probe_only(void); +bool of_pci_bridge_preserve_resources(struct device_node *node); #else static inline struct device_node *of_pci_find_child_device(struct device_node *parent, unsigned int devfn) @@ -26,6 +27,11 @@ static inline int of_pci_get_devfn(struct device_node *np) } static inline void of_pci_check_probe_only(void) { } + +static inline bool of_pci_bridge_preserve_resources(struct device_node *node) +{ + return false; +} #endif #if IS_ENABLED(CONFIG_OF_IRQ)