From patchwork Sat Jan 13 06:52:19 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Kasireddy, Vivek" X-Patchwork-Id: 13518895 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 B48A0C47DA6 for ; Sat, 13 Jan 2024 07:16:57 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 8E7D510E162; Sat, 13 Jan 2024 07:16:45 +0000 (UTC) Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.11]) by gabe.freedesktop.org (Postfix) with ESMTPS id 25F6910E0D5 for ; Sat, 13 Jan 2024 07:16:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1705130200; x=1736666200; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=U5Op4CjhDDAHfKtiDzpe6+9a1b7R8CllBxVTE/TesJE=; b=LIPV9lI1ddzqzSDaqmB6vHtcWxMhZXFfix6AXtTJ3yOPBihmYC2U+SPQ 8LhJSYPtOxStj2X0aOOdR/zdb6ETvzgz5rZY18HQgxh9Mzp6frynneKK2 rRIl+2kdXYzA+se8b04ndEImQISdwxOid9l4FDyVogys/69Oz223ZuubT 67oYQ/dZjaQwxE4EiMjgEHfBWht8IpGb/XX1x3IWFoVvmAcEpyZ0C8MWO XsfVo5++K5VcUQ88xGRmP8VyBZuMo/hFZex0AxNQE5vS/PdeT/KzuyIzp uxExgILbuBH2ruvqEEizEVu9tFg4QqaicrYQIc48nsPE1eLJqUuT45EsR Q==; X-IronPort-AV: E=McAfee;i="6600,9927,10951"; a="6078138" X-IronPort-AV: E=Sophos;i="6.04,191,1695711600"; d="scan'208";a="6078138" Received: from orsmga002.jf.intel.com ([10.7.209.21]) by fmvoesa105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Jan 2024 23:16:39 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10951"; a="783269499" X-IronPort-AV: E=Sophos;i="6.04,191,1695711600"; d="scan'208";a="783269499" Received: from vkasired-desk2.fm.intel.com ([10.105.128.132]) by orsmga002-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Jan 2024 23:16:38 -0800 From: Vivek Kasireddy To: dri-devel@lists.freedesktop.org, linux-mm@kvack.org Subject: [PATCH v11 4/8] udmabuf: Use vmf_insert_pfn and VM_PFNMAP for handling mmap Date: Fri, 12 Jan 2024 22:52:19 -0800 Message-Id: <20240113065223.1532987-5-vivek.kasireddy@intel.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240113065223.1532987-1-vivek.kasireddy@intel.com> References: <20240113065223.1532987-1-vivek.kasireddy@intel.com> MIME-Version: 1.0 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: , Cc: Dongwon Kim , David Hildenbrand , Daniel Vetter , Hugh Dickins , Vivek Kasireddy , Peter Xu , Gerd Hoffmann , Jason Gunthorpe , Junxiao Chang , Mike Kravetz Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Add VM_PFNMAP to vm_flags in the mmap handler to ensure that the mappings would be managed without using struct page. And, in the vm_fault handler, use vmf_insert_pfn to share the page's pfn to userspace instead of directly sharing the page (via struct page *). Cc: David Hildenbrand Cc: Daniel Vetter Cc: Mike Kravetz Cc: Hugh Dickins Cc: Peter Xu Cc: Jason Gunthorpe Cc: Gerd Hoffmann Cc: Dongwon Kim Cc: Junxiao Chang Suggested-by: David Hildenbrand Acked-by: David Hildenbrand Signed-off-by: Vivek Kasireddy --- drivers/dma-buf/udmabuf.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/drivers/dma-buf/udmabuf.c b/drivers/dma-buf/udmabuf.c index c40645999648..820c993c8659 100644 --- a/drivers/dma-buf/udmabuf.c +++ b/drivers/dma-buf/udmabuf.c @@ -35,12 +35,13 @@ 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; if (pgoff >= ubuf->pagecount) return VM_FAULT_SIGBUS; - vmf->page = ubuf->pages[pgoff]; - get_page(vmf->page); - return 0; + + pfn = page_to_pfn(ubuf->pages[pgoff]); + return vmf_insert_pfn(vma, vmf->address, pfn); } static const struct vm_operations_struct udmabuf_vm_ops = { @@ -56,6 +57,7 @@ static int mmap_udmabuf(struct dma_buf *buf, struct vm_area_struct *vma) vma->vm_ops = &udmabuf_vm_ops; vma->vm_private_data = ubuf; + vm_flags_set(vma, VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP); return 0; }