From nobody Sun Oct 5 14:30:47 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; dmarc=pass(p=quarantine dis=none) header.from=kernel.org ARC-Seal: i=1; a=rsa-sha256; t=1754311898; cv=none; d=zohomail.com; s=zohoarc; b=MGpK/O9FG/wGBeGlB4EumcJ1m5yvvrOmgI9aB/U9LsEN3/AiRy1yl1qczCpQj1uXSG/8SoZTQNv7AVVZ8DV8s02ALttBQ+QTbTBGb20NVezYbkxm+TY30dZ5TnnWpnfMMdzB+Eu+ANMaa9KJTwxDuxPBTHmSu8Q0EG9kJF9JMOE= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1754311898; h=Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=6HioLDHG809Vrmu++exqw36yATpmFSDSvFtTDDJtgR8=; b=A82YUMLkSD8UayS0A3FgKGjKqAPJ6lN2JpWmDIbkfGMWlg0/nquTpeR9/TcfZDWvSBj8RKluN2bmdWbrJJ/Hvpa773dcts8CdT4UpnojVKn5AxfUGYZC1YXj0MR658yY4dI7vuhUjDi268o68nXmo/aNXYhlIa61cLz6aE2lA38= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; dmarc=pass header.from= (p=quarantine dis=none) Return-Path: Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) by mx.zohomail.com with SMTPS id 1754311898698398.48493125052505; Mon, 4 Aug 2025 05:51:38 -0700 (PDT) Received: from list by lists.xenproject.org with outflank-mailman.1069219.1433096 (Exim 4.92) (envelope-from ) id 1uiuf2-0004SQ-P9; Mon, 04 Aug 2025 12:51:28 +0000 Received: by outflank-mailman (output) from mailman id 1069219.1433096; Mon, 04 Aug 2025 12:51:28 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uiuf2-0004SH-KP; Mon, 04 Aug 2025 12:51:28 +0000 Received: by outflank-mailman (input) for mailman id 1069219; Mon, 04 Aug 2025 12:51:27 +0000 Received: from se1-gles-flk1-in.inumbo.com ([94.247.172.50] helo=se1-gles-flk1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uiuXl-0006V7-OS for xen-devel@lists.xenproject.org; Mon, 04 Aug 2025 12:43:57 +0000 Received: from nyc.source.kernel.org (nyc.source.kernel.org [147.75.193.91]) by se1-gles-flk1.inumbo.com (Halon) with ESMTPS id aeec951e-7130-11f0-b898-0df219b8e170; Mon, 04 Aug 2025 14:43:56 +0200 (CEST) Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by nyc.source.kernel.org (Postfix) with ESMTP id 52057A55826; Mon, 4 Aug 2025 12:43:55 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 91EBCC4CEF0; Mon, 4 Aug 2025 12:43:53 +0000 (UTC) X-Outflank-Mailman: Message body and most headers restored to incoming version X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: aeec951e-7130-11f0-b898-0df219b8e170 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1754311435; bh=j/IXC/mk0CucPDkDZSOLBQ/UHxOlDcVl+SoZNP0e+X0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ihw3Mu90j8p2iuP5oqZQ0qRYRAR/2eX9T50SB8VLM/IpeY+W5wW61GhW3av4wc29C 5rQPXs1M+s6jjy1+nIw6SWxZuIavX26CaEl38gSuxVMHKz9Ozga++BdX/JbT+AreaD thi1puaSRP5nUcta2FCkabbmnkHrUDPmtBsN8oUFKF0vUAnM1ZHd3jM+br9WjySLQ8 NTL3Vo53fSv59+EK2VgBP0cZFK4osZ7IM6oRQqchl8AnWygksQAVNXy453HYzPo2QW I3SOs53kRy1kdIAph2yeNZ5VK6beeqdsIxQeMAXinFMWTJElchVQzM+2upe9a5Me8M xXtsI8WERuQcg== From: Leon Romanovsky To: Marek Szyprowski Cc: Leon Romanovsky , Jason Gunthorpe , Abdiel Janulgue , Alexander Potapenko , Alex Gaynor , Andrew Morton , Christoph Hellwig , Danilo Krummrich , iommu@lists.linux.dev, Jason Wang , Jens Axboe , Joerg Roedel , Jonathan Corbet , Juergen Gross , kasan-dev@googlegroups.com, Keith Busch , linux-block@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-nvme@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, linux-trace-kernel@vger.kernel.org, Madhavan Srinivasan , Masami Hiramatsu , Michael Ellerman , "Michael S. Tsirkin" , Miguel Ojeda , Robin Murphy , rust-for-linux@vger.kernel.org, Sagi Grimberg , Stefano Stabellini , Steven Rostedt , virtualization@lists.linux.dev, Will Deacon , xen-devel@lists.xenproject.org Subject: [PATCH v1 09/16] dma-mapping: handle MMIO flow in dma_map|unmap_page Date: Mon, 4 Aug 2025 15:42:43 +0300 Message-ID: <152745932ce4200e4baaedcc59ef45c230e47896.1754292567.git.leon@kernel.org> X-Mailer: git-send-email 2.50.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @kernel.org) X-ZM-MESSAGEID: 1754311901139124100 Content-Type: text/plain; charset="utf-8" From: Leon Romanovsky Extend base DMA page API to handle MMIO flow. Signed-off-by: Leon Romanovsky --- kernel/dma/mapping.c | 24 ++++++++++++++++++++---- 1 file changed, 20 insertions(+), 4 deletions(-) diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c index 709405d46b2b4..f5f051737e556 100644 --- a/kernel/dma/mapping.c +++ b/kernel/dma/mapping.c @@ -158,6 +158,7 @@ dma_addr_t dma_map_page_attrs(struct device *dev, struc= t page *page, { const struct dma_map_ops *ops =3D get_dma_ops(dev); phys_addr_t phys =3D page_to_phys(page) + offset; + bool is_mmio =3D attrs & DMA_ATTR_MMIO; dma_addr_t addr; =20 BUG_ON(!valid_dma_direction(dir)); @@ -166,12 +167,23 @@ dma_addr_t dma_map_page_attrs(struct device *dev, str= uct page *page, return DMA_MAPPING_ERROR; =20 if (dma_map_direct(dev, ops) || - arch_dma_map_phys_direct(dev, phys + size)) + (!is_mmio && arch_dma_map_phys_direct(dev, phys + size))) addr =3D dma_direct_map_phys(dev, phys, size, dir, attrs); else if (use_dma_iommu(dev)) addr =3D iommu_dma_map_phys(dev, phys, size, dir, attrs); - else + else if (is_mmio) { + if (!ops->map_resource) + return DMA_MAPPING_ERROR; + + addr =3D ops->map_resource(dev, phys, size, dir, attrs); + } else { + /* + * All platforms which implement .map_page() don't support + * non-struct page backed addresses. + */ addr =3D ops->map_page(dev, page, offset, size, dir, attrs); + } + kmsan_handle_dma(phys, size, dir); trace_dma_map_phys(dev, phys, addr, size, dir, attrs); debug_dma_map_phys(dev, phys, size, dir, addr, attrs); @@ -184,14 +196,18 @@ void dma_unmap_page_attrs(struct device *dev, dma_add= r_t addr, size_t size, enum dma_data_direction dir, unsigned long attrs) { const struct dma_map_ops *ops =3D get_dma_ops(dev); + bool is_mmio =3D attrs & DMA_ATTR_MMIO; =20 BUG_ON(!valid_dma_direction(dir)); if (dma_map_direct(dev, ops) || - arch_dma_unmap_phys_direct(dev, addr + size)) + (!is_mmio && arch_dma_unmap_phys_direct(dev, addr + size))) dma_direct_unmap_phys(dev, addr, size, dir, attrs); else if (use_dma_iommu(dev)) iommu_dma_unmap_phys(dev, addr, size, dir, attrs); - else + else if (is_mmio) { + if (ops->unmap_resource) + ops->unmap_resource(dev, addr, size, dir, attrs); + } else ops->unmap_page(dev, addr, size, dir, attrs); trace_dma_unmap_phys(dev, addr, size, dir, attrs); debug_dma_unmap_phys(dev, addr, size, dir); --=20 2.50.1