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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id C23B9CA0EE6 for ; Tue, 19 Aug 2025 18:22:37 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 481A78E0059; Tue, 19 Aug 2025 14:22:37 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 431C48E0003; Tue, 19 Aug 2025 14:22:37 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 284D18E0059; Tue, 19 Aug 2025 14:22:37 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0016.hostedemail.com [216.40.44.16]) by kanga.kvack.org (Postfix) with ESMTP id 16A348E0003 for ; Tue, 19 Aug 2025 14:22:37 -0400 (EDT) Received: from smtpin23.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay07.hostedemail.com (Postfix) with ESMTP id 95EA916019F for ; Tue, 19 Aug 2025 18:22:36 +0000 (UTC) X-FDA: 83794327512.23.1CB38B2 Received: from tor.source.kernel.org (tor.source.kernel.org [172.105.4.254]) by imf03.hostedemail.com (Postfix) with ESMTP id 047732000B for ; Tue, 19 Aug 2025 18:22:34 +0000 (UTC) Authentication-Results: imf03.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b="alN6/hwH"; spf=pass (imf03.hostedemail.com: domain of kbusch@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=kbusch@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1755627755; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=rPawf4MAOK3K2lEjypEKyp/U3T0IFN68PxzTHE3J6/E=; b=i9pGGZpecLrsW1f8Kc4mpM0dbt7+VOe/jCJeCpn7tjpYm6Wk39+0C+HpCzszqiVIJ28pWu WRx456KVvG3fVxem14rgb4tjei2c/tfhNC7JzHuxJUUvNuIRMaR7VkZDCNxryJG70krm3A /8Dq9R4H19H8HHN3ZqQKQfyzKMgTzcY= ARC-Authentication-Results: i=1; imf03.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b="alN6/hwH"; spf=pass (imf03.hostedemail.com: domain of kbusch@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=kbusch@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1755627755; a=rsa-sha256; cv=none; b=jraL+Y65FVXb2M3ck5ZP8+69pOzaQYHRNhaKGJkzZS/T3p0Lkp43h11yqpOFqSVf3rZqEj VkejjQf+TEBTfUze7xbZBJ/f8FWk+/KdvhYVeIZDA5gQ+Xw9QHeJ5FT6yXb/TU1XEk5VsP ZpkYILDr+qxKXxZLmGHE3E2t9LXiTUk= 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-Stat-Signature: sfqsiuwri7r54zb3egm881ixuijgcuie X-Rspam-User: X-Rspamd-Queue-Id: 047732000B X-Rspamd-Server: rspam05 X-HE-Tag: 1755627754-937530 X-HE-Meta: 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 JCh4OFpI Eji+mveuu1OocM/h9VJli99L7gXlbAihgJuZC4scDC51cp7ruMbOH9whPftrTdD7vnb+tIwduVLQymab0ZdVTh7HvhyuHNl5PGbYN4X4+pCfTCMEr6PSPpm/ZPuMjkGtyMbTXg0+tmNnTVsSRjtrJncVRHlr5GARisj24IcARWkKFtkU5smCDIyJQQutVuUKXo3i0lprEvBjU+VgTQgY7jvbdXKIae9BQ1Ju/okCVtkua+Db5blWYiLlvBCscgFx/S9xqirSIqGOhk8+qOZJWJ4QqyUF8FJ4lkOmLlXmN+JH5ebzjAi9aOaib6035XrrI2/U9E+pXogxkiBg1410PcmM4+ZQUceFMTHXlF3ia8iyZ/hBa9mjB1P8KpuUXhrssy99j/KBQWROhTD9lR1K9F5dxc8AkfyVkykl3 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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