From mboxrd@z Thu Jan 1 00:00:00 1970 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 03602CA0EFA for ; Thu, 21 Aug 2025 03:44:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=rPawf4MAOK3K2lEjypEKyp/U3T0IFN68PxzTHE3J6/E=; b=v+N9vxCSE3cnn+JGlfyE7Za36Z 5SYZTnTiDW4ZgLbgmN7RM7WB/0MKu/b3rCu8vETDBnh3UXMSSwVqUZprEsR7NTMCpxYUXsfpzDfmC 5vJwnoKei454kAeA8D5ZeFlOKaLEzwjLDH0nVAhw0qmlWDfyWzVGiBZ4hPebfllxZcUy8/P6j5zGE uY7TvlfJ9Hps2EQ82Q+TxrnWPYCH6HX0TubD6I5NxNQ78bcwxdZnHMcLpmBuWhT4SdCDF+pTuoOdC SbIIOEyugNe1Du+B+h9C43XuYM9WKc04viLueR2Y6aC3RLsSwXEGORrXVP4KKN6ryvos4ATOds2xf WX4Sh01Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1uowE4-0000000FhZH-2B81; Thu, 21 Aug 2025 03:44:32 +0000 Received: from tor.source.kernel.org ([2600:3c04:e001:324:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1uoQyh-0000000BHSF-0j7t for linux-nvme@lists.infradead.org; Tue, 19 Aug 2025 18:22:35 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id 594E960209; Tue, 19 Aug 2025 18:22:34 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8557CC4CEF1; Tue, 19 Aug 2025 18:22:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1755627754; bh=VSqn6WSqLVd/XpfzgudXSJRo0uPOQ5wyv2bWmCBBnJg=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=alN6/hwHpvzthoP/KrllDuyPfF9f8yAYQER8+ba4p7ZAaMRpwoXt8rvK6QE3L0ekl bNm+CTndacGb+nR2BKXPNUnvE9okK+nJN6vWKLBypTEbMKpjdWZnobeyYbTdlJBwG3 eQhAlRfAJUiGmqIDHRjbObolLDa17Te4yFQpGASd/eKfIFxPevya5z3Kg7b9O2j2pW xGJZckYIQxAQDMxUtnVFWJEEUia3gPTM6PRono+D9/zC602CQuuuu0N45uS/29jmmO kxle5BpRno+jkLFSoQGxLhrpEA9gCkuIidPS0ZJ3bdNRJ1LR7RUOVZQkLijjuMZ2fZ kFmTbvgXjx5hQ== Date: Tue, 19 Aug 2025 12:22:30 -0600 From: Keith Busch To: Leon Romanovsky Cc: Marek Szyprowski , 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, 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: Re: [PATCH v4 11/16] dma-mapping: export new dma_*map_phys() interface Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Mailman-Approved-At: Wed, 20 Aug 2025 20:44:16 -0700 X-BeenThere: linux-nvme@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org On Tue, Aug 19, 2025 at 08:36:55PM +0300, Leon Romanovsky wrote: > From: Leon Romanovsky > > Introduce new DMA mapping functions dma_map_phys() and dma_unmap_phys() > that operate directly on physical addresses instead of page+offset > parameters. This provides a more efficient interface for drivers that > already have physical addresses available. > > The new functions are implemented as the primary mapping layer, with > the existing dma_map_page_attrs()/dma_map_resource() and > dma_unmap_page_attrs()/dma_unmap_resource() functions converted to simple > wrappers around the phys-based implementations. > > In case dma_map_page_attrs(), the struct page is converted to physical > address with help of page_to_phys() function and dma_map_resource() > provides physical address as is together with addition of DMA_ATTR_MMIO > attribute. > > The old page-based API is preserved in mapping.c to ensure that existing > code won't be affected by changing EXPORT_SYMBOL to EXPORT_SYMBOL_GPL > variant for dma_*map_phys(). Looks good. Reviewed-by: Keith Busch