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 X-Spam-Level: X-Spam-Status: No, score=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3B3EFCA9EC0 for ; Mon, 28 Oct 2019 12:38:14 +0000 (UTC) Received: from mail.linuxfoundation.org (mail.linuxfoundation.org [140.211.169.12]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 0D471208C0 for ; Mon, 28 Oct 2019 12:38:14 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0D471208C0 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=iommu-bounces@lists.linux-foundation.org Received: from mail.linux-foundation.org (localhost [127.0.0.1]) by mail.linuxfoundation.org (Postfix) with ESMTP id DCBAA10BC; Mon, 28 Oct 2019 12:38:13 +0000 (UTC) Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTPS id 953D2B1F for ; Mon, 28 Oct 2019 12:38:12 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from verein.lst.de (verein.lst.de [213.95.11.211]) by smtp1.linuxfoundation.org (Postfix) with ESMTPS id 2F03B87B for ; Mon, 28 Oct 2019 12:38:12 +0000 (UTC) Received: by verein.lst.de (Postfix, from userid 2407) id F170068B05; Mon, 28 Oct 2019 13:38:05 +0100 (CET) Date: Mon, 28 Oct 2019 13:38:05 +0100 From: "hch@lst.de" To: Laurentiu Tudor Subject: Re: [PATCH v2 1/3] dma-mapping: introduce new dma unmap and sync api variants Message-ID: <20191028123805.GA25160@lst.de> References: <20191024124130.16871-1-laurentiu.tudor@nxp.com> <20191024124130.16871-2-laurentiu.tudor@nxp.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20191024124130.16871-2-laurentiu.tudor@nxp.com> User-Agent: Mutt/1.5.17 (2007-11-01) Cc: Ioana Ciocoi Radulescu , "davem@davemloft.net" , "netdev@vger.kernel.org" , Madalin Bucur , "linux-kernel@vger.kernel.org" , Leo Li , "iommu@lists.linux-foundation.org" , Ioana Ciornei , "robin.murphy@arm.com" , "hch@lst.de" X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: iommu-bounces@lists.linux-foundation.org Errors-To: iommu-bounces@lists.linux-foundation.org On Thu, Oct 24, 2019 at 12:41:41PM +0000, Laurentiu Tudor wrote: > From: Laurentiu Tudor > > Introduce a few new dma unmap and sync variants that, on top of the > original variants, return the virtual address corresponding to the > input dma address. > In order to implement this a new dma map op is added and used: > void *get_virt_addr(dev, dma_handle); > It does the actual conversion of an input dma address to the output > virtual address. We'll definitively need an implementation for dma-direct at least as well. Also as said previously we need a dma_can_unmap_by_dma_addr() or similar helper that tells the driver beforehand if this works, so that the driver can either use a sub-optimal workaround or fail the probe if this functionality isn't implemented. _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu