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b=hw62FJPGy7/wwxQnqDuZqiKBJ0/FarpCd/B6mBiWWMtD/nSl9PszJ0WiFguLASK1ipLKs8q4SoBy1iju9wqyN4r63uc+CvL+1eyxwUZZWrmTBHi4vndJ19iQXl57Zu482X676bkBJBY0b+FptA+DvSF6+MpusfgmHk4nF1QJO2EXdJoqZU9FRdkK4ZAACiPIP7f/IpBjhwvTlFK3u9kxr/ILs7qCtO0kCJIEzyfTS3qkgK1M4eWXJGTGOVsmdJOUpVcX/cqJpmCepXunHUzbWR2svq8dRj/rj+gsEzV1p/lgpnxBnAsDpmyXcpofArBJkPAPjrVLIp3u0uxbV7B7CA== 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 TYZPR06MB6402.apcprd06.prod.outlook.com (2603:1096:400:425::6) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7875.27; Thu, 22 Aug 2024 08:44:42 +0000 Received: from PUZPR06MB5676.apcprd06.prod.outlook.com ([fe80::a00b:f422:ac44:636f]) by PUZPR06MB5676.apcprd06.prod.outlook.com ([fe80::a00b:f422:ac44:636f%5]) with mapi id 15.20.7875.019; Thu, 22 Aug 2024 08:44:41 +0000 From: Huan Yang To: 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 , Vivek Kasireddy Subject: [PATCH v4 1/5] udmabuf: direct map pfn when first page fault Date: Thu, 22 Aug 2024 16:43:33 +0800 Message-ID: <20240822084342.1574914-2-link@vivo.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240822084342.1574914-1-link@vivo.com> References: <20240822084342.1574914-1-link@vivo.com> X-ClientProxiedBy: SI1PR02CA0059.apcprd02.prod.outlook.com (2603:1096:4:1f5::19) To PUZPR06MB5676.apcprd06.prod.outlook.com (2603:1096:301:f8::10) Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PUZPR06MB5676:EE_|TYZPR06MB6402:EE_ X-MS-Office365-Filtering-Correlation-Id: 57638795-8c5f-41a3-c021-08dcc286aa2d X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|366016|376014|52116014|38350700014; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 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 X-OriginatorOrg: vivo.com X-MS-Exchange-CrossTenant-Network-Message-Id: 57638795-8c5f-41a3-c021-08dcc286aa2d X-MS-Exchange-CrossTenant-AuthSource: PUZPR06MB5676.apcprd06.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 22 Aug 2024 08:44:41.8227 (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: a0l9MHEH+zOwyOm3wAr5cDeLXM6Gx+svB5rGG2TwcNp219D8CeNUCpKThJdGcOu5BMJNuCHQJNLTRymBryLIxA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: TYZPR06MB6402 The current udmabuf mmap uses a page fault to populate the vma. 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 vma area with pfn when the first page fault trigger, so, any other access will not enter page fault. Suggested-by: Vivek Kasireddy Signed-off-by: Huan Yang --- drivers/dma-buf/udmabuf.c | 26 ++++++++++++++++++++++++-- 1 file changed, 24 insertions(+), 2 deletions(-) diff --git a/drivers/dma-buf/udmabuf.c b/drivers/dma-buf/udmabuf.c index 047c3cd2ceff..0e33d25310ec 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, end, pfn; + vm_fault_t ret; if (pgoff >= ubuf->pagecount) return VM_FAULT_SIGBUS; @@ -51,7 +52,28 @@ 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; + end = vma->vm_end; + addr = vma->vm_start; + + for (; addr < end; pgoff++, addr += PAGE_SIZE) { + if (addr == vmf->address) + continue; + + pfn = folio_pfn(ubuf->folios[pgoff]); + + pfn += ubuf->offsets[pgoff] >> PAGE_SHIFT; + + if (vmf_insert_pfn(vma, addr, pfn) & VM_FAULT_ERROR) + break; + } + + return ret; } static const struct vm_operations_struct udmabuf_vm_ops = {