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Wed, 2 Jun 2021 11:11:05 +0000 Received: from HQMAIL101.nvidia.com (172.20.187.10) by HQMAIL101.nvidia.com (172.20.187.10) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Wed, 2 Jun 2021 11:11:04 +0000 Received: from r-arch-stor03.mtr.labs.mlnx (172.20.187.5) by mail.nvidia.com (172.20.187.10) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Wed, 2 Jun 2021 11:10:56 +0000 From: Max Gurtovoy To: , , , , CC: , , , , , Max Gurtovoy Subject: [RFC PATCH 0/3] PCI/P2PMEM: introduce pci_p2pdma_align_size API Date: Wed, 2 Jun 2021 14:10:52 +0300 Message-ID: <20210602111055.10480-1-mgurtovoy@nvidia.com> X-Mailer: git-send-email 2.18.1 MIME-Version: 1.0 Content-Type: text/plain X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 8761c5cf-3660-4312-b7ab-08d925b71dcf X-MS-TrafficTypeDiagnostic: DM6PR12MB3259: X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:8882; X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: qAt8o6q6ucgAmo2fFioY0KiqGisUfYRlOm+goakZ3nQdvG6MIvlhJI3t3WSUCOaBhbew+STw3TySyEWUeh1+l+ReyEFy8PLmlW9RBpgJVX9oF3PHBpBBuLdsH0FqVsA4fISth4tsQkFcn0a60CoyciqzPJOTE3Xl/qp2sru2hmnkkgJNkCWwche/b0LXG/gLXcAP03249ySFafrw0BPQj3W1G7HyqEU4h2mb2yD+id5HOlBJXDZRiFM10uSW+2G0ioW/7ea7fu2/3a1ZzKCMqewa9qh85vG6fEEOYNv8UQdDqqb6dg1S7WDAcgCQfAkqflRpM394+8gY5aQX9nzg9/k222Q9l0Ppy7OINjQ1gxQcey32bwd3L3tcM2z7iQpHkcsBx7Xck0zQ9unh16opKclwLgSpxy2gExKYV9MSl+PvPvPtIDOCqB4v/tfTIwSSGHiVXeH5kmTpXOxymX9DQzm/sv4jXqnK90Svty2dXRnMWsJmtkEkVvPs2Z6z8+iZs3jziRCiZvyH6XEV+Xl3n/w0ew9JCgEs9U0oPQU0gtMVRNADIOveeOhPiM+t7RCuJbSWF2QQzJkHEx7lXuiPSXCH/HrNxAG2PpOOvJ+w63jluXseMqjb3Kbcs7pI3galfvCm1KVZ+xOPP5owRljBHbfC4/IWDrl4heTm1N3s9Y8= X-Forefront-Antispam-Report: CIP:216.228.112.36;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:schybrid05.nvidia.com;CAT:NONE;SFS:(4636009)(136003)(346002)(396003)(376002)(39860400002)(36840700001)(46966006)(5660300002)(426003)(2906002)(36756003)(82740400003)(26005)(2616005)(110136005)(36906005)(1076003)(36860700001)(4326008)(70206006)(86362001)(8936002)(316002)(8676002)(70586007)(54906003)(6666004)(356005)(7636003)(47076005)(83380400001)(186003)(478600001)(336012)(107886003)(82310400003)(2101003);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 02 Jun 2021 11:11:05.7172 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 8761c5cf-3660-4312-b7ab-08d925b71dcf X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.112.36];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BN8NAM11FT050.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR12MB3259 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi all, In hotplugged memory (from check_pfn_span function): " Disallow all operations smaller than a sub-section and only allow operations smaller than a section for SPARSEMEM_VMEMMAP. Note that check_hotplug_memory_range() enforces a larger memory_block_size_bytes() granularity for memory that will be marked online, so this check should only fire for direct arch_{add,remove}_memory() users outside of add_memory_resource() " This restriction will disqualify, for example, large NVMe CMBs that might have non power of 2 number of pages (e.g. 32767 pages of 4KB). For these devices, the CMB size will be rounded down from 0x7fff000 to 0x7e00000 but it's better than having un-mapped CMB. If we all agree on the approach, this RFC can assist as-is to these NVMe devices and other P2PMEM devices in the future and can considered for the next merge window. Max Gurtovoy (3): mm,memory_hotplug: export mhp min alignment PCI/P2PMEM: introduce pci_p2pdma_align_size API nvme-pci: align CMB size according to P2PMEM alignment drivers/nvme/host/pci.c | 7 +++++++ drivers/pci/p2pdma.c | 23 +++++++++++++++++++++++ include/linux/memory_hotplug.h | 5 +++++ include/linux/pci-p2pdma.h | 5 +++++ mm/memory_hotplug.c | 33 +++++++++++++++++++-------------- 5 files changed, 59 insertions(+), 14 deletions(-) -- 2.18.1