From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id AED05C433F5 for ; Thu, 17 Mar 2022 16:13:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236442AbiCQQOx (ORCPT ); Thu, 17 Mar 2022 12:14:53 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58882 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236408AbiCQQOp (ORCPT ); Thu, 17 Mar 2022 12:14:45 -0400 Received: from na01-obe.outbound.protection.outlook.com (mail-eus2azon11020021.outbound.protection.outlook.com [52.101.56.21]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 41D03381A1; Thu, 17 Mar 2022 09:13:28 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=D0XUdOPuwLZ8xC6HhysLCejSgCpB0BaxKTNaSKDH9u8gphuCjGm9PPDg7XaG5QRLIkRCxVSfz9JB6Rl7GRxExOmeYmswiHyuBbtUUxVCr/rOghb0lNetWg3XxPqpSUlkmibsM2iFULQx6Wf9ZLDMfDiTso7W5+yHpsFO93QxFalS1hzDlbWHF5tVjP7YpL4qZuqClQLG8ADpF4SU8MbQ7x8ZHXVpTdrkHlqf8W4dMDsVKCxKakuI/wvcf05u1/C2HiVn622g95dN26GbwY4nT1xq/qw5XKOf7BUGMAnkklV5e4LRjAQj4vaYJKYKs4D6oBEfnwyuwlrV5qwqE0JaRA== 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=TMBkvB8XqJXPIW9KcFtQrPV7sFII7sr9r1YK92fPbUg=; b=VBxbGBjt/2YkPUB7PrjK2SU0vVyRFAmBZMjwNzu0Joa3bqVg9GtBP50LImtJjI4gLwlLb5UPfTabFsO+YZ5uNbWZ8h1TXyIAljt4vSTFuV8jM/fyIwnk1rCjV/qbMckU2g2AkVO/aDG4UHEoGQPvWfFF/gzF1WPVKkhSTxOzMqCC6EQ8/kqrKYJy3f0EGTeJGXmq4rUmoy3b0lR9UxMYP/IjcVwjE739ZLpTtZko9ssTUONNXsEhuk3XgDra2CRdwxAoDPLT5GomiQKsfK8Q/YtrI+r4OukFBC81E12LH5S1huuUyue8uI0+QaBynTAQHYqkK0ML0p2dHvDsnx1YxQ== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=microsoft.com; dmarc=pass action=none header.from=microsoft.com; dkim=pass header.d=microsoft.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=TMBkvB8XqJXPIW9KcFtQrPV7sFII7sr9r1YK92fPbUg=; b=dkDavD1FvmusPuQ6fUI/IYFBt8jEmGBHKTm+RrvAMycyf35y5UlBKJF5fEFXmTOGbu0VNIPJzuKwylizlWgTERLPToyMOmSs4kGe8LPpbX160flUUkTDlOEXq2SWUBOfE6NpRjqHF5ENx0tWu4stK8f2UbCRRFBq+yag9UxKsgw= Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=microsoft.com; Received: from DM6PR21MB1514.namprd21.prod.outlook.com (2603:10b6:5:22d::11) by BL0PR2101MB0995.namprd21.prod.outlook.com (2603:10b6:207:36::29) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5081.15; Thu, 17 Mar 2022 16:13:24 +0000 Received: from DM6PR21MB1514.namprd21.prod.outlook.com ([fe80::8c81:f644:fc1c:1357]) by DM6PR21MB1514.namprd21.prod.outlook.com ([fe80::8c81:f644:fc1c:1357%4]) with mapi id 15.20.5102.007; Thu, 17 Mar 2022 16:13:24 +0000 From: Michael Kelley To: sthemmin@microsoft.com, kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, rafael@kernel.org, lenb@kernel.org, lorenzo.pieralisi@arm.com, robh@kernel.org, kw@linux.com, bhelgass@google.com, hch@lst.de, m.szyprowski@samsung.com, robin.murphy@arm.com, linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-pci@vger.kernel.org, iommu@lists.linux-foundation.org Cc: mikelley@microsoft.com Subject: [PATCH 4/4] PCI: hv: Propagate coherence from VMbus device to PCI device Date: Thu, 17 Mar 2022 09:12:43 -0700 Message-Id: <1647533563-2170-5-git-send-email-mikelley@microsoft.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1647533563-2170-1-git-send-email-mikelley@microsoft.com> References: <1647533563-2170-1-git-send-email-mikelley@microsoft.com> Content-Type: text/plain X-ClientProxiedBy: MW3PR06CA0007.namprd06.prod.outlook.com (2603:10b6:303:2a::12) To DM6PR21MB1514.namprd21.prod.outlook.com (2603:10b6:5:22d::11) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: d4cff443-a6ff-451c-1ab7-08da08310fc9 X-MS-TrafficTypeDiagnostic: BL0PR2101MB0995:EE_ X-MS-Exchange-AtpMessageProperties: SA|SL X-Microsoft-Antispam-PRVS: 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:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:DM6PR21MB1514.namprd21.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230001)(4636009)(366004)(451199009)(83380400001)(186003)(26005)(4326008)(8676002)(2616005)(8936002)(66946007)(66476007)(66556008)(107886003)(38100700002)(38350700002)(316002)(36756003)(10290500003)(6486002)(86362001)(5660300002)(921005)(6512007)(82960400001)(7416002)(82950400001)(6506007)(2906002)(508600001)(6666004)(52116002);DIR:OUT;SFP:1102; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?wpa7za5s+S79bphKolbPoSax4gOtIK9fIyPAJIfMpadwHMiv0Qggvg/4aJLQ?= =?us-ascii?Q?WuYuRJ+ouTQ3JJ1dWC5ZpiAJt4AtnKKFwWzvqrdr2Z8RnokxbTE7YcSSKpP0?= =?us-ascii?Q?DeLfsDi5y2AJfN/7C9UGY1mWaV7bqpQEF03iMUE+NdgrLHQmMZyuIQpJLCZc?= =?us-ascii?Q?M5RHWzXBQRAbe0ZCRIFuL99kwPVzImWWb0/Ccnn2EifrQ+WVet/6Mc+qH3rA?= =?us-ascii?Q?CLxAD4sQ2LuPk4L7YNNLLm/l7FdW3jJ61/UAB46+XJK6dArPmmEBJfVjcPg0?= =?us-ascii?Q?swFMWPTd0Fs96SYp1Vt2QGjlpC5LUz6nj+To7VrMndaDWrbqDzW1lqcHfpJA?= =?us-ascii?Q?g1qec4PT9z/nMb+DL6o/KqmGZlKuDsDUq6y4sVp3mqrMVWW6m684rNSF+Enn?= =?us-ascii?Q?P+dCtQ20zDBMtq1ELNqFTvZU+Y32xMhemt28x7yh2tw+5pmQn62BYp7oU0O6?= =?us-ascii?Q?OwixHT8KTTUVL2qjGSlk/3Dhs/BIG6HXDf1wcyWI5/SVr1yf9q+vRfRL8wkH?= =?us-ascii?Q?ywwshmPJrPCTbZfkCrWS4VQyXmq1TcRaDEcHQGwYPAaJRsyLN8U+64cO4TeC?= =?us-ascii?Q?7FvUSPXRq4eGaG70FDs6lAyWMTNMcPRCj8EIjKHjZdJXnjqqhaF/ebSVEEHn?= =?us-ascii?Q?CJdUPOcCjNm5zIVcQwmYGFEmrFJDHNQKuFtRRf+Juz7clBUrdUqrAWeK2uAp?= =?us-ascii?Q?SdFFOX+OeLGIYNyDa1hpPFLmwuY4DrdXgA8L/WC8JbZN3JAnHdw9tUeAq2av?= =?us-ascii?Q?zjNq9Eg8C1FEL5aN2vrFLkJOq014JNwQYPrtXaorMzxeOb2D4XT5FbYhw916?= =?us-ascii?Q?+ReYKuPo8lxk2DCbJNun+9QmOYpTBjRD01VK2EEmRSmuN35KISo/2wTlXThg?= =?us-ascii?Q?n8Pmxp7fz46jpOdFwK3yDjUO9vsZztL43W0zNivTW+mezsLWVeV57VUkJlpi?= =?us-ascii?Q?6xjMd2kBZv2ayVqqQ7KxE6a8LDBD86168+7vLFnlpkofD5C+5yUOLwwxM91m?= =?us-ascii?Q?dv1iT7B1M8syLq7BjiMthy8TVRW4iRkGdNWid76Yhf1ZLDca6uC4LuSQN2gw?= =?us-ascii?Q?0BBhhFvCCcFmvzZ3RCbFH4jrPK1Pss80jb+f3Tb4M/UL5Nohj5NYXJr25ZoW?= =?us-ascii?Q?A/H5nigs5seymNNrOEusXtYezut+ouEYLu6VYMNALtq8l4FVCp35okmHqjUC?= =?us-ascii?Q?x9lLQb+q6SzIIfaHc5NXI4rLkRgGs0l6717c7LjaCD87gc4cLpHi4fUb0lpZ?= =?us-ascii?Q?jmwRsh+oFiEZ8gUc4J2E0AKFbXVNaLv9K3Xk0fJN3EbAUgfZWv1IaShut3k/?= =?us-ascii?Q?k8Dmw+JccrZVZGkQiqTih3fScVl3EBmBOfvq8lDYSwysRcTc6MYC8fK8jZey?= =?us-ascii?Q?PsHyOWTehpDB4e3yKtKBXO4DTh94NE5qFpFC3Vr5bJoHmevSOqKWUN8UOQhm?= =?us-ascii?Q?GYq6l+T7BlvadEQAZ8kKGFjr1/d4uIH/0v4BS0gHu1pEeC3kceX/pw=3D=3D?= X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: d4cff443-a6ff-451c-1ab7-08da08310fc9 X-MS-Exchange-CrossTenant-AuthSource: DM6PR21MB1514.namprd21.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 17 Mar 2022 16:13:23.8587 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: 7hTbIRfFZ8ioxq3ygHo1svUQtGR4o2oQK6kuWh0plS6lQfsFeL7XGAj+35Jc5FU9sCVsnzCCUMk8HSLrSpzhPw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL0PR2101MB0995 Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org PCI pass-thru devices in a Hyper-V VM are represented as a VMBus device and as a PCI device. The coherence of the VMbus device is set based on the VMbus node in ACPI, but the PCI device has no ACPI node and defaults to not hardware coherent. This results in extra software coherence management overhead on ARM64 when devices are hardware coherent. Fix this by propagating the coherence of the VMbus device to the PCI device. There's no effect on x86/x64 where devices are always hardware coherent. Signed-off-by: Michael Kelley --- drivers/pci/controller/pci-hyperv.c | 17 +++++++++++++---- 1 file changed, 13 insertions(+), 4 deletions(-) diff --git a/drivers/pci/controller/pci-hyperv.c b/drivers/pci/controller/pci-hyperv.c index ae0bc2f..14276f5 100644 --- a/drivers/pci/controller/pci-hyperv.c +++ b/drivers/pci/controller/pci-hyperv.c @@ -49,6 +49,7 @@ #include #include #include +#include #include /* @@ -2142,9 +2143,9 @@ static void hv_pci_remove_slots(struct hv_pcibus_device *hbus) } /* - * Set NUMA node for the devices on the bus + * Set NUMA node and DMA coherence for the devices on the bus */ -static void hv_pci_assign_numa_node(struct hv_pcibus_device *hbus) +static void hv_pci_assign_properties(struct hv_pcibus_device *hbus) { struct pci_dev *dev; struct pci_bus *bus = hbus->bridge->bus; @@ -2167,6 +2168,14 @@ static void hv_pci_assign_numa_node(struct hv_pcibus_device *hbus) numa_map_to_online_node( hv_dev->desc.virtual_numa_node)); + /* + * On ARM64, propagate the DMA coherence from the VMbus device + * to the corresponding PCI device. On x86/x64, these calls + * have no effect because DMA is always hardware coherent. + */ + dev_set_dma_coherent(&dev->dev, + dev_is_dma_coherent(&hbus->hdev->device)); + put_pcichild(hv_dev); } } @@ -2191,7 +2200,7 @@ static int create_root_hv_pci_bus(struct hv_pcibus_device *hbus) return error; pci_lock_rescan_remove(); - hv_pci_assign_numa_node(hbus); + hv_pci_assign_properties(hbus); pci_bus_assign_resources(bridge->bus); hv_pci_assign_slots(hbus); pci_bus_add_devices(bridge->bus); @@ -2458,7 +2467,7 @@ static void pci_devices_present_work(struct work_struct *work) */ pci_lock_rescan_remove(); pci_scan_child_bus(hbus->bridge->bus); - hv_pci_assign_numa_node(hbus); + hv_pci_assign_properties(hbus); hv_pci_assign_slots(hbus); pci_unlock_rescan_remove(); break; -- 1.8.3.1