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Sun, 1 Dec 2024 02:38:02 -0800 From: Yonatan Maman To: , , , , , , , , , , , , , , , , Subject: [RFC 3/5] IB/core: P2P DMA for device private pages Date: Sun, 1 Dec 2024 12:36:57 +0200 Message-ID: <20241201103659.420677-4-ymaman@nvidia.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241201103659.420677-1-ymaman@nvidia.com> References: <20241201103659.420677-1-ymaman@nvidia.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 X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BL02EPF0001A0FA:EE_|IA1PR12MB7688:EE_ X-MS-Office365-Filtering-Correlation-Id: ad54d123-a9c9-4cc4-275a-08dd11f443c8 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|82310400026|1800799024|36860700013|921020; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?KZmezP+Wq3JGWwEB6N2WfTCFWHXrLwv6y4ywRh7UDxP1riQyHowo0PqAEKLN?= =?us-ascii?Q?gkvKmbu7GXRKLQOLbYdmny38oYZjVTmGWWfICCTb7xFQmtziftdTch5u9//d?= =?us-ascii?Q?HUqYpFlG3Wmj2SKp2fabhu5Rf47KRSWos9iYi+QHlsPNSYrE/m2HtMhcjZVF?= =?us-ascii?Q?lTkvbcEcZ49KhFZyC5u3blC3tQhHarQdfbArMDq2DN+XqUUyq8Ph6Jcr470V?= =?us-ascii?Q?sxuiD3FB4J4TtFPNhCI56HyzBF52Ks+FpEREKeto+ItnWsA2Oa884y0d/zsN?= =?us-ascii?Q?iejgvcgE8CAnVPIBEHRy2NICJ3EC1Z8aXHwktsHbYn2iMIg32NmYUR/xPjY9?= =?us-ascii?Q?mbAePwr/WoHkZnU8y+odqIUsy/epypEPqh123pLnw4GmPZEbLIa+3jUe9GaJ?= =?us-ascii?Q?bUgfRBWxWCW9k8xmd660o+jt8yQJLAQmb/fxG7nEp7QQLpPCbmclIFEkIFXp?= =?us-ascii?Q?Jp/jMMFmmv63aHkjAACwtIrbGSDUpJFHCPWBe8eSr9qk7N2U6TB4MAGwqq4Z?= =?us-ascii?Q?3BRCwQzZRdsVku+yvQ/ooqEa1ukT96ontW0U6ONKkkt41v8KbnEX5a9VsPHJ?= =?us-ascii?Q?TuNn2F4/T3sKRbbGimdGDHQAMmkvwtIDZGSBRSdgzbvNnlHMSVhteiQwcLYY?= =?us-ascii?Q?BvWD9eNyI+a6IBf3jzl4DJNookWHeOOQQWWMgxeBZskaJjgqrd1IB+QB6P2X?= =?us-ascii?Q?BWo1POzLuJ67VQMKp7pAwL/QLJ3GUB+5W4YWBytOMamvWPjamGL68mVzw0eB?= =?us-ascii?Q?B8K6/G1GKhWQuOc0UXf47SfDN1XhWms3wGASdVzSXgqsWMYQ0mtHaL5XqY9x?= =?us-ascii?Q?BXyyQI58le43hx+8XfWDSGJvAX47B6+DItbrjugC8KTKDpz7R4DdFnddtVBq?= =?us-ascii?Q?HfgDLV2oG7WzCPDc1zuFvBdxJ7dk8IOX3rxKYdOHlbkOOS1cZXCr+AAuLnke?= =?us-ascii?Q?LToXDOwLuVASYPxmq6/5LYtpFirYtaHsXnx6nFEcobnel2JXnRv4zUyMDWFC?= =?us-ascii?Q?En2684DiFv40aSZ1ns71shiHfxQDWjvaLnrst1SobrkjUOeLRfnzW4wn5K8I?= =?us-ascii?Q?jGtovmhS839NstxI0/gxlXjCHODaqblTBVKtXLJPSJB7oX19XUR+ebj9t4yc?= =?us-ascii?Q?xqYBotFhKQ3LBifRuE71Cw2PVC7Bs4YF8jiIfIqqkb/WafICTe0HIco8D71B?= =?us-ascii?Q?Xms9vLPeC9qIwC0lUaAJ8TC1UQxAeQIFRvE//JcJUY8QBAdmF9LVMySen1fV?= =?us-ascii?Q?cTWdLdzZAndu60Irp8XKfC841fsIKFjh5y3eyGVv9VKm2+PHRlQkWQmJyvkM?= =?us-ascii?Q?rA8q3LzO9RSAj9wQqfO2Ptv339a4A1jJ0CNOuqDbQEoAgWaSoDdlsX9RhHb3?= =?us-ascii?Q?tkhmvCTJOk9mIVQAePaID/mbywlkVM2ssdWRrmjeUroF+m9DZKRTxEw2uDhi?= =?us-ascii?Q?IzdU9EUyJBFKIFt9YtQ1J7yquiKICbIwpyaO987Y7hwwoNWdaU6P4A=3D=3D?= X-Forefront-Antispam-Report: CIP:216.228.118.233;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc7edge2.nvidia.com;CAT:NONE;SFS:(13230040)(376014)(7416014)(82310400026)(1800799024)(36860700013)(921020);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 01 Dec 2024 10:38:16.1486 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: ad54d123-a9c9-4cc4-275a-08dd11f443c8 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.233];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BL02EPF0001A0FA.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA1PR12MB7688 Content-Type: text/plain; charset="utf-8" From: Yonatan Maman Add Peer-to-Peer (P2P) DMA request for hmm_range_fault calling, utilizing capabilities introduced in mm/hmm. By setting range.default_flags to HMM_PFN_REQ_FAULT | HMM_PFN_REQ_TRY_P2P, HMM attempts to initiate P2P DMA connections for device private pages (instead of page fault handling). This enhancement utilizes P2P DMA to reduce performance overhead during data migration between devices (e.g., GPU) and system memory, providing performance benefits for GPU-centric applications that utilize RDMA and device private pages. Signed-off-by: Yonatan Maman Signed-off-by: Gal Shalom --- drivers/infiniband/core/umem_odp.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/infiniband/core/umem_odp.c b/drivers/infiniband/core/u= mem_odp.c index 51d518989914..4c2465b9bdda 100644 --- a/drivers/infiniband/core/umem_odp.c +++ b/drivers/infiniband/core/umem_odp.c @@ -332,6 +332,10 @@ int ib_umem_odp_map_dma_and_lock(struct ib_umem_odp *u= mem_odp, u64 user_virt, range.default_flags |=3D HMM_PFN_REQ_WRITE; } =20 + if (access_mask & HMM_PFN_ALLOW_P2P) + range.default_flags |=3D HMM_PFN_ALLOW_P2P; + + range.pfn_flags_mask =3D HMM_PFN_ALLOW_P2P; range.hmm_pfns =3D &(umem_odp->map.pfn_list[pfn_start_idx]); timeout =3D jiffies + msecs_to_jiffies(HMM_RANGE_DEFAULT_TIMEOUT); =20 --=20 2.34.1