From patchwork Mon Sep 9 09:18:39 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Huan Yang X-Patchwork-Id: 13796488 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id ACFE0ECE57B for ; Mon, 9 Sep 2024 09:19:17 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id C323F10E347; Mon, 9 Sep 2024 09:19:14 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=vivo.com header.i=@vivo.com header.b="fSpub4LG"; dkim-atps=neutral Received: from APC01-PSA-obe.outbound.protection.outlook.com (mail-psaapc01on2043.outbound.protection.outlook.com [40.107.255.43]) by gabe.freedesktop.org (Postfix) with ESMTPS id 5E92810E341 for ; Mon, 9 Sep 2024 09:19:13 +0000 (UTC) ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=VK+Sypy38ttK0ZDJ6rNgFj10cJdcw+TKFH9Eeq2Ifotev3eqbpd0sZjrgZ5DlolQ7V8fLdMAelnhG0F3ND87a/QxUwOBIpORXns149VGPo2uaY5R6zgwDQ8r9V+4VDCx6IgCnBgA5y0eDI5T1yzLTY1XgYhmGYIVr36GSArlRHoaJAporaGwgIEX6/6ZNraJ0NxLCOfJOhdXMN5btKdoGPmt7KBvA4K2WBvwBzy4GWZVi607fKP5KHEFrchWzawtaQ2SUp5WHvcya957V3BwDf5DZh56q0gHEQOhim0A3BqSvBSLiJ4o2lKyAYJgZW9fkKbvcRVm9gDwcu+KxiO9ag== 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=93hIlXR6rTCFIQW+5KF6L9/Zv17kVZyN1YP+CsH762Y=; b=IBJq46i+MDJIrHpwc8Xbk+MqNZThsVd6uFadfEfiiHTw2K32sdOA+fYu/VoSdxZWemRrsO78erN82WKy5+a8DmgYWigjKFWVolCQrb5psdqbEt1w1frldnAazxXvJ8AOXkzKas20yd9fxw0h7cVbEkc0IOKpbzW4nTLsxdzHTDBuLDJhIoCnBDh3gNYbkKO61/yU29gSskLWZdPLDtjSzsmMXACCT055jfQxXvr7EwuUJa4P9Fh4x0YtUNCYDUGQqUPcuLeDlN/4pdfL8q67Mr8wHIZrRizDebNcQse05ICLol9UibWsHpBYK2SxC90NmKWsTS4uV8hrrnBWLxDkOw== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=vivo.com; dmarc=pass action=none header.from=vivo.com; dkim=pass header.d=vivo.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=vivo.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=93hIlXR6rTCFIQW+5KF6L9/Zv17kVZyN1YP+CsH762Y=; b=fSpub4LGlr02q2ajoJGRIOQOcZ4PN18Ph2nmDzUv8xbLsAUl09kjLmNUhcWUIFQykTiQQuU436Dj67t7UNXdfR2PcxtNCo8I59zgUgO8g3cHKKt+9z05OlVDIjSNXDd2Lmbf25Zk3ziLBOx6zIk9ErLXVkH78jULcMecoeNftyA9xeQCmLYMjjbaYSsbVKRo73wa9vY8cPhOK3H1JBVgesuNzIPHJhbfIyrUnF+9bOfxjaGIxL+xYoTM7bbN2AKE1xjYp6R0k/F8pKJUolHM5c2NT0fasamHdP1DkeYPLscoAQ8Nxu5LcqU9xlXIca9xKhRnLodEtHAV6sJdSX+CNw== Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=vivo.com; Received: from PUZPR06MB5676.apcprd06.prod.outlook.com (2603:1096:301:f8::10) by JH0PR06MB7180.apcprd06.prod.outlook.com (2603:1096:990:98::11) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7918.27; Mon, 9 Sep 2024 09:19:08 +0000 Received: from PUZPR06MB5676.apcprd06.prod.outlook.com ([fe80::a00b:f422:ac44:636f]) by PUZPR06MB5676.apcprd06.prod.outlook.com ([fe80::a00b:f422:ac44:636f%6]) with mapi id 15.20.7939.017; Mon, 9 Sep 2024 09:19:08 +0000 From: Huan Yang To: vivek.kasireddy@intel.com, Sumit Semwal , =?utf-8?q?Christian_K=C3=B6nig?= , Gerd Hoffmann , linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, linux-kernel@vger.kernel.org Cc: opensource.kernel@vivo.com, Huan Yang Subject: [PATCH v6 1/7] udmabuf: pre-fault when first page fault Date: Mon, 9 Sep 2024 17:18:39 +0800 Message-ID: <20240909091851.1165742-2-link@vivo.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240909091851.1165742-1-link@vivo.com> References: <20240909091851.1165742-1-link@vivo.com> X-ClientProxiedBy: SI1PR02CA0011.apcprd02.prod.outlook.com (2603:1096:4:1f7::19) To PUZPR06MB5676.apcprd06.prod.outlook.com (2603:1096:301:f8::10) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PUZPR06MB5676:EE_|JH0PR06MB7180:EE_ X-MS-Office365-Filtering-Correlation-Id: 547b8ed0-d8bd-4b8d-bcae-08dcd0b07595 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; ARA:13230040|366016|1800799024|52116014|376014|38350700014; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255; CTRY:; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:PUZPR06MB5676.apcprd06.prod.outlook.com; PTR:; CAT:NONE; SFS:(13230040)(366016)(1800799024)(52116014)(376014)(38350700014); DIR:OUT; SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: fpI95VbIck56EVrOyABw7n5ijNyOBQ+aBg6AsRrb0hcQ3qQr73G4Biw5YHHnRPtbhG/pNT/CPClHOz2kazusjVLFm1OLqWck8M4O/qSeRF+gHlAFWT7GRE5yU3IrFovVl7YLFWZwjiwvKtCHtZjN79w0/6QiNAwNzt2tHfDWAhugntuoqhh1fqaH0a9PvE00zzaMNyzcbia4G1JiAYq+tnTFU7Ll/9fxqxq++ENeP8gNZKZhrcL00gESDRSoPwRFutuKICQEVcjWH85D0o4Pce5zCloLav7VcWj0v6eBVhOiP1kfgOb4VfcGwxSNWVrD+t0UvDptNvkYVYBrYRfAJgXEY7LTRoNcv+KAr+i1weLnvXyv3PLwiNXfJC2IVRF65loJlYD616NYhlBLO2DWgeyYItqlCPQTH5drhfyr8VcrHd5h5wH5VRpzvHI/pGbSQlCTjM8xrXe0Y/rDHXrLjVusyX1udswgDbpfOhNWKzkIK1p2JoyqWVioxNLiB9mdnCLN4BjQYDeyBUOE5BWar0FvtXHIZ3RUSgOs4ke+S/Rgps6zRe2OeNIsoe3hI5SUNRFh0xWzuHqlKXtgiwZQZo+QRc6glqM6D+FjIbHu4oQtetaoC9wGfInhGS2vqustM07dgZj7JuJ8qaFCy8uKJv6E/LgyCbtDgVuwkhVlAQV+tUzOCb/kRLKAnRcrKVMed79dOE+k8B1Cb99fu5yZVYaoAGcRF3VnzVsq119q6FwdR0KrHStUjZkvM9xrLEojLkbcmGQOtRbRAVOjzE65cEANAQItwNCIPah/LUXt5Takqg6i8XJTsEeBRj/oBPWbxGRpQFo/iR87mI4tkZVQX16Tl+3J2ljfYHhpxw6WRsZAJL66+spnA+OWxKHEShh+TTKN9z4eYtFelT9BHaiwolGadPtPevAw3QFM/uSt0Qp6iTAZ8/l1XRGbDlGcYO3DL0vpFNs64/nicNRQPBoIY3nF2bI0dnDd6p0Ay0VT2nRsVhNvGzwIcZjwW0YYLE9l0l2mFB4Trs1cXvIu+xKuWiLcT/wZaIJSiSU9aXpsWKYPbpAwsjHvnuvFlAYTsir2Sad7HEnu/zE4m3UMIBxLwbsVfW3aTK1EMb22jgRMNhI9n0abwE/CaxgaRiAF0G3VaVXgInt9kLMQg+sCCSNLe+0CNFvDHRQEB1vaDVgJrTZRZj/mt4JPqWZSto76Gmq9ArpEzftIW4Lvqq2f+8fbesCTKiPRX50Gjr1+V5qTAVmlH+6vZDHsP6yVZsOuUgWwy7t2tqN8E35lRRCOeWPwTODgsaO2X0kiWKjW1roq7iPjnzV7NvDbfvmz4JjsO2u0qwc5szfNamDrOeH5916iumW40Eq48q1+k+pQ64WHQrlNXUmtpJdvUIk6jy/rrNWQ62dY982y5aesTW382YaijXpkxoMiD8LNfDaZ5fbRMnZlMtlNyRG9C6/JGNyIWswr/QnjfRz6cdUa+jZ4ZwWE3VU+fcJaD46agK6e3CfPHR6+o9d3QxKqSOktpyAjteVJOvAKZ5KCw8fcE6wybNyJqAeWikiA3XCqp4EGABBuQEvdOtJOR/gJ+WoDBQE5DHzS X-OriginatorOrg: vivo.com X-MS-Exchange-CrossTenant-Network-Message-Id: 547b8ed0-d8bd-4b8d-bcae-08dcd0b07595 X-MS-Exchange-CrossTenant-AuthSource: PUZPR06MB5676.apcprd06.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 Sep 2024 09:19:08.6705 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 923e42dc-48d5-4cbe-b582-1a797a6412ed X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: 5DwNIy56TfWgpzjZsGXBrx6oKRF2yIxXPX+heaJy2srxFJF0R7J/hYghXJ+g4OgdVCdpn87rCzbwCcpodibVqQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: JH0PR06MB7180 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" The current udmabuf mmap only fills the physical memory to the corresponding virtual address when the user actually accesses the virtual address. However, the current udmabuf has already obtained and pinned the folio upon completion of the creation.This means that the physical memory has already been acquired, rather than being accessed dynamically. As a result, the page fault has lost its purpose as a demanding page. Due to the fact that page fault requires trapping into kernel mode and filling in when accessing the corresponding virtual address in mmap, when creating a large size udmabuf, this represents a considerable overhead. This patch fill the pfn into page table, and then pre-fault each pfn into vma, when first access. Notice, if anything wrong , we do not return an error during this pre-fault step. However, an error will be returned if the failure occurs when the addr is truly accessed Suggested-by: Vivek Kasireddy Signed-off-by: Huan Yang Acked-by: Vivek Kasireddy --- drivers/dma-buf/udmabuf.c | 33 +++++++++++++++++++++++++++++++-- 1 file changed, 31 insertions(+), 2 deletions(-) diff --git a/drivers/dma-buf/udmabuf.c b/drivers/dma-buf/udmabuf.c index 047c3cd2ceff..2170d975cc76 100644 --- a/drivers/dma-buf/udmabuf.c +++ b/drivers/dma-buf/udmabuf.c @@ -43,7 +43,8 @@ static vm_fault_t udmabuf_vm_fault(struct vm_fault *vmf) struct vm_area_struct *vma = vmf->vma; struct udmabuf *ubuf = vma->vm_private_data; pgoff_t pgoff = vmf->pgoff; - unsigned long pfn; + unsigned long addr, pfn; + vm_fault_t ret; if (pgoff >= ubuf->pagecount) return VM_FAULT_SIGBUS; @@ -51,7 +52,35 @@ static vm_fault_t udmabuf_vm_fault(struct vm_fault *vmf) pfn = folio_pfn(ubuf->folios[pgoff]); pfn += ubuf->offsets[pgoff] >> PAGE_SHIFT; - return vmf_insert_pfn(vma, vmf->address, pfn); + ret = vmf_insert_pfn(vma, vmf->address, pfn); + if (ret & VM_FAULT_ERROR) + return ret; + + /* pre fault */ + pgoff = vma->vm_pgoff; + addr = vma->vm_start; + + for (; addr < vma->vm_end; pgoff++, addr += PAGE_SIZE) { + if (addr == vmf->address) + continue; + + if (WARN_ON(pgoff >= ubuf->pagecount)) + break; + + pfn = folio_pfn(ubuf->folios[pgoff]); + pfn += ubuf->offsets[pgoff] >> PAGE_SHIFT; + + /** + * If the below vmf_insert_pfn() fails, we do not return an + * error here during this pre-fault step. However, an error + * will be returned if the failure occurs when the addr is + * truly accessed. + */ + if (vmf_insert_pfn(vma, addr, pfn) & VM_FAULT_ERROR) + break; + } + + return ret; } static const struct vm_operations_struct udmabuf_vm_ops = {