From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from DM1PR04CU001.outbound.protection.outlook.com (mail-centralusazon11010012.outbound.protection.outlook.com [52.101.61.12]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 41CEE495536; Tue, 12 May 2026 09:26:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=52.101.61.12 ARC-Seal:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778578020; cv=fail; b=d+uXK6jY1EzWZlF+Ddkhm/GdP2IiJMiD18a4mToJBxyve9pnwdUYgIt33bbwBQlHddd16qmHMyShpgdTZ28wkwzzRu0o+Op/Cyv30nJpiKM/pkymMJXr1wqPZbCfB1Zxue+qKdrtlPVNeDiyTKboDzI4iupREC2W1RHNfSGTPe8= ARC-Message-Signature:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778578020; c=relaxed/simple; bh=fHHDICTr3QauDlGSuKegg3JeYTsmwhSBNipYjAUziMw=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=tm/kVg8icuGrqMNX+ge9ioyPyKzb986lgXTI2SlTVUNCBuOMNx6RVAUe+juR3xE/sZYqfRUoGhUe8fY5Z04JWgq9rnIygN5kdYTCF4ZHXWNR2otIAru7nGeOIWUtI3XRog9CF3MeuNUKbXe2gKQmLyk59chKSglc5tMZ2FgyeEQ= ARC-Authentication-Results:i=2; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amd.com; spf=fail smtp.mailfrom=amd.com; dkim=pass (1024-bit key) header.d=amd.com header.i=@amd.com header.b=EyNYaZPT; arc=fail smtp.client-ip=52.101.61.12 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amd.com Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=amd.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=amd.com header.i=@amd.com header.b="EyNYaZPT" ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=ctObjcaqr3QYyL9SIkksIKYYr0gU2p1PG/uu2ljwFAn42bziSFMI41QEoE3JwCYBeum/RilNxysCwBdJN4+SLYy9rZkaV5oW3fSOSz6wfsJML9lHHiUZYmtWgHJMGtoYGxRZIYYnebcwB56iR1ZFCQFz4DcHt5Bha+2B/ZIHTTiaa1NyZKikPegxP+QuWhWd+dbtTpHa/SE1+gmTPQyoKL6pdsgntmFkcggvv6RTXxmuP88ee3nlSSCvCDe5ETmfxx5fEbcz0vP5GuctiSZTQyAt1yIMi+GA+joaLAA/GPpATwHZuK9ElSnSDt9xQChTgq3EDTwRLVOeziMdITUwQw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; 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=1euzOzKj8BBLSvKPplBHbMvjen22ygwoXLFjJGRLhWM=; b=HPUV3FdmdS863xA0F9M5/4JJbDcEzGd58UDMLUP6HXP56eCuQ4MZZ+YTWNaukIXDm+UajBqZpnE9IQuJt+5Q9Zo7lqaqsZp0egYTxuAoAsi0Q3+17oHHZL0B2OyVgjO8YbmwqM1TzOhGFob0c+kTU5s4i8lUlduebotPv9ixhmNeFNEkxsB3XrFjjxroY4Lm6UYtZlHCplsFXyaxpMI1lopXQwwDtz0+iblwlmoiRj9FoVwcrwVRi6NJPnFSPdhe8ZOReI5a8SXJZkxo/SvtElaYHOjSEx2R5+9E2ntVH2oWGDGfs3LeoPdvecoJM17B4bCZsrkZOSwXCk4AJxO/Jg== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 165.204.84.17) smtp.rcpttodomain=ziepe.ca smtp.mailfrom=amd.com; dmarc=pass (p=quarantine sp=quarantine pct=100) action=none header.from=amd.com; dkim=none (message not signed); arc=none (0) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amd.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=1euzOzKj8BBLSvKPplBHbMvjen22ygwoXLFjJGRLhWM=; b=EyNYaZPTYkolIO8FRjbFljkIpwvRLY+XSnb9HVOpHbK0LQr0Q1fPrZE6p5ncYH/1KeFu4nIvP6C1pjZg8StHZSlMrK9OxntTBrOQHg5mCJDK6ZLnm78RiElz7+qDtes3576JyfZ7Nn8rxyebXlwP6sLguSTNXT4TkO+FoNmxBto= Received: from BL0PR02CA0093.namprd02.prod.outlook.com (2603:10b6:208:51::34) by LV8PR12MB9133.namprd12.prod.outlook.com (2603:10b6:408:188::15) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9891.23; Tue, 12 May 2026 09:26:51 +0000 Received: from BL02EPF00021F6F.namprd02.prod.outlook.com (2603:10b6:208:51:cafe::54) by BL0PR02CA0093.outlook.office365.com (2603:10b6:208:51::34) with Microsoft SMTP Server (version=TLS1_3, cipher=TLS_AES_256_GCM_SHA384) id 15.20.9913.11 via Frontend Transport; Tue, 12 May 2026 09:26:51 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 165.204.84.17) smtp.mailfrom=amd.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=amd.com; 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=satlexmb08.amd.com; pr=C Received: from satlexmb08.amd.com (165.204.84.17) by BL02EPF00021F6F.mail.protection.outlook.com (10.167.249.11) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.25.13 via Frontend Transport; Tue, 12 May 2026 09:26:51 +0000 Received: from satlexmb10.amd.com (10.181.42.219) by satlexmb08.amd.com (10.181.42.217) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.41; Tue, 12 May 2026 04:26:50 -0500 Received: from satlexmb07.amd.com (10.181.42.216) by satlexmb10.amd.com (10.181.42.219) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.41; Tue, 12 May 2026 04:26:50 -0500 Received: from xhdipdslab46.xilinx.com (10.180.168.240) by satlexmb07.amd.com (10.181.42.216) with Microsoft SMTP Server id 15.2.2562.41 via Frontend Transport; Tue, 12 May 2026 04:26:47 -0500 From: Abhijit Gangurde To: , , , , , , , CC: , , , , , Abhijit Gangurde Subject: [for-next v2 3/4] RDMA/ionic: map PHC state into user space Date: Tue, 12 May 2026 14:56:22 +0530 Message-ID: <20260512092623.1157199-4-abhijit.gangurde@amd.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260512092623.1157199-1-abhijit.gangurde@amd.com> References: <20260512092623.1157199-1-abhijit.gangurde@amd.com> Precedence: bulk X-Mailing-List: linux-rdma@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BL02EPF00021F6F:EE_|LV8PR12MB9133:EE_ X-MS-Office365-Filtering-Correlation-Id: dc951c5a-ea86-47cc-dfac-08deb008995e X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|376014|36860700016|1800799024|82310400026|18002099003|22082099003|56012099003|11063799003; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:satlexmb08.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(7416014)(376014)(36860700016)(1800799024)(82310400026)(18002099003)(22082099003)(56012099003)(11063799003);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: HxP9dKsl2je8eBv8u6eweYxidIamk/joyqmwxg0c4YyZ5e+cK5MQJkmTF8t7ovKZIEi9dAJI1dYlL8R1/h4UOxse79P/j5qtNwJtHdStfZtyY42sdd5VtbgntsaGdXF7smTFBt433Z9kx2tL8OHICuSSHU4YcciIrcVDJdpu/bg/DjkTnQnAOMUuW49kvxVecBUbVjYVmCcSGjJGnmB3LB6BwDou4VNCyBFcWtyGlinfDCqMPVbP/dWfranB2Btu5WSLMDyA7aHpNzg2du2t/GKHYivZNizqwnhQYnxI/V2kNppnc539K+9CzJAM6/E27VjogUQcZBWuhBfHu1Hnsgdmt5aXc/O2v59yLCzkzPm4bbmChJjmvpsHBQSl6UgQqLrsKXW9hbLVpiy3GDg6E/8V5zJP1lztQ+h11tTh4z8dqbK+lxpyc3wOsYPIbIIW X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 12 May 2026 09:26:51.2217 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: dc951c5a-ea86-47cc-dfac-08deb008995e 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=[satlexmb08.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BL02EPF00021F6F.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: LV8PR12MB9133 Enable user space applications to access the PHC state page when firmware RDMA completion timestamp is supported. This mapping allows user space to convert RDMA completion timestamps to system wall time without kernel transitions, minimizing latency overhead. Applications can directly read the PHC state through mmap, enabling efficient timestamp correlation for precision timing applications. Co-developed-by: Allen Hubbe Signed-off-by: Allen Hubbe Signed-off-by: Abhijit Gangurde --- .../infiniband/hw/ionic/ionic_controlpath.c | 36 ++++++++++++++++++- drivers/infiniband/hw/ionic/ionic_ibdev.h | 2 ++ drivers/infiniband/hw/ionic/ionic_lif_cfg.c | 2 ++ drivers/infiniband/hw/ionic/ionic_lif_cfg.h | 1 + include/uapi/rdma/ionic-abi.h | 1 + 5 files changed, 41 insertions(+), 1 deletion(-) diff --git a/drivers/infiniband/hw/ionic/ionic_controlpath.c b/drivers/infiniband/hw/ionic/ionic_controlpath.c index 7051a81cca94..aceeea605acd 100644 --- a/drivers/infiniband/hw/ionic/ionic_controlpath.c +++ b/drivers/infiniband/hw/ionic/ionic_controlpath.c @@ -391,6 +391,16 @@ int ionic_alloc_ucontext(struct ib_ucontext *ibctx, struct ib_udata *udata) goto err_mmap_dbell; } + if (dev->lif_cfg.phc_state) { + ctx->mmap_phc = ionic_mmap_entry_insert(ctx, PAGE_SIZE, 0, + IONIC_MMAP_PHC, + &resp.phc_offset); + if (!ctx->mmap_phc) { + rc = -ENOMEM; + goto err_mmap_phc; + } + } + resp.page_shift = PAGE_SHIFT; resp.dbell_offset = db_phys & ~PAGE_MASK; @@ -414,13 +424,15 @@ int ionic_alloc_ucontext(struct ib_ucontext *ibctx, struct ib_udata *udata) if (dev->lif_cfg.rq_expdb) resp.expdb_qtypes |= IONIC_EXPDB_RQ; - rc = ib_copy_to_udata(udata, &resp, sizeof(resp)); + rc = ib_respond_udata(udata, resp); if (rc) goto err_resp; return 0; err_resp: + rdma_user_mmap_entry_remove(ctx->mmap_phc); +err_mmap_phc: rdma_user_mmap_entry_remove(ctx->mmap_dbell); err_mmap_dbell: ionic_put_dbid(dev, ctx->dbid); @@ -433,10 +445,26 @@ void ionic_dealloc_ucontext(struct ib_ucontext *ibctx) struct ionic_ibdev *dev = to_ionic_ibdev(ibctx->device); struct ionic_ctx *ctx = to_ionic_ctx(ibctx); + rdma_user_mmap_entry_remove(ctx->mmap_phc); rdma_user_mmap_entry_remove(ctx->mmap_dbell); ionic_put_dbid(dev, ctx->dbid); } +static int ionic_mmap_phc_stage(struct ionic_ibdev *dev, + struct vm_area_struct *vma) +{ + if (!(vma->vm_flags & VM_SHARED)) + return -EINVAL; + + if (vma->vm_flags & (VM_WRITE | VM_EXEC)) + return -EPERM; + + vm_flags_clear(vma, VM_MAYWRITE); + + return vm_insert_page(vma, vma->vm_start, + virt_to_page(dev->lif_cfg.phc_state)); +} + int ionic_mmap(struct ib_ucontext *ibctx, struct vm_area_struct *vma) { struct ionic_ibdev *dev = to_ionic_ibdev(ibctx->device); @@ -455,6 +483,12 @@ int ionic_mmap(struct ib_ucontext *ibctx, struct vm_area_struct *vma) ionic_entry = container_of(rdma_entry, struct ionic_mmap_entry, rdma_entry); + if (ionic_entry->mmap_flags & IONIC_MMAP_PHC) { + rc = ionic_mmap_phc_stage(dev, vma); + rdma_user_mmap_entry_put(rdma_entry); + return rc; + } + ibdev_dbg(&dev->ibdev, "writecombine? %d\n", ionic_entry->mmap_flags & IONIC_MMAP_WC); if (ionic_entry->mmap_flags & IONIC_MMAP_WC) diff --git a/drivers/infiniband/hw/ionic/ionic_ibdev.h b/drivers/infiniband/hw/ionic/ionic_ibdev.h index 63828240d659..08655c4d8297 100644 --- a/drivers/infiniband/hw/ionic/ionic_ibdev.h +++ b/drivers/infiniband/hw/ionic/ionic_ibdev.h @@ -72,6 +72,7 @@ enum ionic_admin_flags { enum ionic_mmap_flag { IONIC_MMAP_WC = BIT(0), + IONIC_MMAP_PHC = BIT(1), }; struct ionic_mmap_entry { @@ -173,6 +174,7 @@ struct ionic_ctx { struct ib_ucontext ibctx; u32 dbid; struct rdma_user_mmap_entry *mmap_dbell; + struct rdma_user_mmap_entry *mmap_phc; }; struct ionic_tbl_buf { diff --git a/drivers/infiniband/hw/ionic/ionic_lif_cfg.c b/drivers/infiniband/hw/ionic/ionic_lif_cfg.c index f3cd281c3a2f..e3f2df1f9e6a 100644 --- a/drivers/infiniband/hw/ionic/ionic_lif_cfg.c +++ b/drivers/infiniband/hw/ionic/ionic_lif_cfg.c @@ -40,6 +40,8 @@ void ionic_fill_lif_cfg(struct ionic_lif *lif, struct ionic_lif_cfg *cfg) cfg->dbid_count = le32_to_cpu(lif->ionic->ident.dev.ndbpgs_per_lif); cfg->dbpage = lif->kern_dbpage; cfg->intr_ctrl = lif->ionic->idev.intr_ctrl; + if (ident->eth.config.features & cpu_to_le64(IONIC_ETH_HW_RDMA_TIMESTAMP)) + cfg->phc_state = lif->phc->state_page; cfg->db_phys = lif->ionic->bars[IONIC_PCI_BAR_DBELL].bus_addr; diff --git a/drivers/infiniband/hw/ionic/ionic_lif_cfg.h b/drivers/infiniband/hw/ionic/ionic_lif_cfg.h index 20853429f623..2b29e646c193 100644 --- a/drivers/infiniband/hw/ionic/ionic_lif_cfg.h +++ b/drivers/infiniband/hw/ionic/ionic_lif_cfg.h @@ -23,6 +23,7 @@ struct ionic_lif_cfg { u64 __iomem *dbpage; struct ionic_intr __iomem *intr_ctrl; phys_addr_t db_phys; + void *phc_state; u64 page_size_supported; u32 npts_per_lif; diff --git a/include/uapi/rdma/ionic-abi.h b/include/uapi/rdma/ionic-abi.h index 7b589d3e9728..2c70ac149c4f 100644 --- a/include/uapi/rdma/ionic-abi.h +++ b/include/uapi/rdma/ionic-abi.h @@ -48,6 +48,7 @@ struct ionic_ctx_resp { __u8 expdb_qtypes; __u8 rsvd2[3]; + __aligned_u64 phc_offset; }; struct ionic_qdesc { -- 2.43.0