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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 SJ1PEPF000023D8.mail.protection.outlook.com (10.167.244.73) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.7762.1 via Frontend Transport; Tue, 9 Jul 2024 13:36:30 +0000 Received: from SATLEXMB04.amd.com (10.181.40.145) 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; Tue, 9 Jul 2024 08:36:29 -0500 Received: from ubuntu.mshome.net (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server id 15.1.2507.39 via Frontend Transport; Tue, 9 Jul 2024 08:36:28 -0500 From: Stewart Hildebrand To: Bjorn Helgaas CC: Stewart Hildebrand , , Subject: [PATCH 2/6] PCI: restore resource alignment Date: Tue, 9 Jul 2024 09:35:59 -0400 Message-ID: <20240709133610.1089420-3-stewart.hildebrand@amd.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240709133610.1089420-1-stewart.hildebrand@amd.com> References: <20240709133610.1089420-1-stewart.hildebrand@amd.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: None (SATLEXMB04.amd.com: stewart.hildebrand@amd.com does not designate permitted sender hosts) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ1PEPF000023D8:EE_|SN7PR12MB6958:EE_ X-MS-Office365-Filtering-Correlation-Id: 14190bd5-dd53-4dff-b9d0-08dca01c2468 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|376014|82310400026|36860700013; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 Jul 2024 13:36:30.7326 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 14190bd5-dd53-4dff-b9d0-08dca01c2468 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: SJ1PEPF000023D8.namprd21.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN7PR12MB6958 Content-Type: text/plain; charset="utf-8" Devices with alignment specified will lose their alignment in cases when the bridge resources have been released, e.g. due to insufficient bridge window size. Restore the alignment. Signed-off-by: Stewart Hildebrand --- drivers/pci/setup-bus.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c index 23082bc0ca37..ab7510ce6917 100644 --- a/drivers/pci/setup-bus.c +++ b/drivers/pci/setup-bus.c @@ -1594,6 +1594,23 @@ static void __pci_bridge_assign_resources(const stru= ct pci_dev *bridge, } } =20 +static void restore_child_resource_alignment(struct pci_bus *bus) +{ + struct pci_dev *dev; + + list_for_each_entry(dev, &bus->devices, bus_list) { + struct pci_bus *b; + + pci_reassigndev_resource_alignment(dev); + + b =3D dev->subordinate; + if (!b) + continue; + + restore_child_resource_alignment(b); + } +} + #define PCI_RES_TYPE_MASK \ (IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_PREFETCH |\ IORESOURCE_MEM_64) @@ -1648,6 +1665,8 @@ static void pci_bridge_release_resources(struct pci_b= us *bus, r->start =3D 0; r->flags =3D 0; =20 + restore_child_resource_alignment(bus); + /* Avoiding touch the one without PREF */ if (type & IORESOURCE_PREFETCH) type =3D IORESOURCE_PREFETCH; --=20 2.45.2