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client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C Received: from SATLEXMB04.amd.com (165.204.84.17) by SJ5PEPF000001D0.mail.protection.outlook.com (10.167.242.52) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.8207.12 via Frontend Transport; Wed, 27 Nov 2024 05:48:28 +0000 Received: from BLR-L-BHARARAO.amd.com (10.180.168.240) 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, 26 Nov 2024 23:48:22 -0600 From: Bharata B Rao To: , , , CC: , , , , , , , , , , , , , Bharata B Rao Subject: [RFC PATCH 1/1] block/ioctl: Add an ioctl to enable large folios for block buffered IO path Date: Wed, 27 Nov 2024 11:17:37 +0530 Message-ID: <20241127054737.33351-2-bharata@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241127054737.33351-1-bharata@amd.com> References: <20241127054737.33351-1-bharata@amd.com> Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: SATLEXMB04.amd.com (10.181.40.145) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ5PEPF000001D0:EE_|CH3PR12MB8355:EE_ X-MS-Office365-Filtering-Correlation-Id: 71a54189-ff83-4cd6-d561-08dd0ea71e24 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|1800799024|36860700013|82310400026; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 27 Nov 2024 05:48:28.2973 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 71a54189-ff83-4cd6-d561-08dd0ea71e24 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: SJ5PEPF000001D0.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH3PR12MB8355 In order to experiment using large folios for block devices read/write operations, expose an ioctl that userspace can selectively use on the raw block devices. For the write path, this forces iomap layer to provision large folios (via iomap_file_buffered_write()). Signed-off-by: Bharata B Rao --- block/ioctl.c | 8 ++++++++ include/uapi/linux/fs.h | 2 ++ 2 files changed, 10 insertions(+) diff --git a/block/ioctl.c b/block/ioctl.c index 6554b728bae6..6af26a08ef34 100644 --- a/block/ioctl.c +++ b/block/ioctl.c @@ -548,6 +548,12 @@ static int blkdev_bszset(struct file *file, blk_mode_t mode, return ret; } +static int blkdev_set_large_folio(struct block_device *bdev) +{ + mapping_set_large_folios(bdev->bd_mapping); + return 0; +} + /* * Common commands that are handled the same way on native and compat * user space. Note the separate arg/argp parameters that are needed @@ -632,6 +638,8 @@ static int blkdev_common_ioctl(struct block_device *bdev, blk_mode_t mode, return blkdev_pr_preempt(bdev, mode, argp, true); case IOC_PR_CLEAR: return blkdev_pr_clear(bdev, mode, argp); + case BLKSETLFOLIO: + return blkdev_set_large_folio(bdev); default: return -ENOIOCTLCMD; } diff --git a/include/uapi/linux/fs.h b/include/uapi/linux/fs.h index 753971770733..5c8a326b68a1 100644 --- a/include/uapi/linux/fs.h +++ b/include/uapi/linux/fs.h @@ -203,6 +203,8 @@ struct fsxattr { #define BLKROTATIONAL _IO(0x12,126) #define BLKZEROOUT _IO(0x12,127) #define BLKGETDISKSEQ _IOR(0x12,128,__u64) +#define BLKSETLFOLIO _IO(0x12, 129) + /* * A jump here: 130-136 are reserved for zoned block devices * (see uapi/linux/blkzoned.h)