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Tue, 24 Mar 2020 07:55:17 +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 whitealder.osuosl.org (Postfix) with ESMTPS id 0070E87AC5 for ; Tue, 24 Mar 2020 07:55:16 +0000 (UTC) Received: by verein.lst.de (Postfix, from userid 2407) id 038C268BFE; Tue, 24 Mar 2020 08:55:15 +0100 (CET) Date: Tue, 24 Mar 2020 08:55:14 +0100 From: Christoph Hellwig To: "Aneesh Kumar K.V" Subject: Re: [PATCH 1/2] dma-mapping: add a dma_ops_bypass flag to struct device Message-ID: <20200324075514.GK23447@lst.de> References: <20200320141640.366360-1-hch@lst.de> <20200320141640.366360-2-hch@lst.de> <2f31d0dd-aa7e-8b76-c8a1-5759fda5afc9@ozlabs.ru> <20200323083705.GA31245@lst.de> <20200323085059.GA32528@lst.de> <87sghz2ibh.fsf@linux.ibm.com> <20200323172256.GB31269@lst.de> <87pnd22rke.fsf@linux.ibm.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <87pnd22rke.fsf@linux.ibm.com> User-Agent: Mutt/1.5.17 (2007-11-01) Cc: Greg Kroah-Hartman , Robin Murphy , linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, linuxppc-dev@lists.ozlabs.org, Christoph Hellwig X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 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 Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" On Tue, Mar 24, 2020 at 12:00:09PM +0530, Aneesh Kumar K.V wrote: > dma_addr_t dma_direct_map_page(struct device *dev, struct page *page, > unsigned long offset, size_t size, enum dma_data_direction dir, > unsigned long attrs) > { > phys_addr_t phys = page_to_phys(page) + offset; > dma_addr_t dma_addr = phys_to_dma(dev, phys); > > if (unlikely(!dma_capable(dev, dma_addr, size, true))) { > return iommu_map(dev, phys, size, dir, attrs); > > return DMA_MAPPING_ERROR; If powerpc hardware / firmware people really come up with crap that stupid you'll have to handle it yourself and will always pay the indirect call penality. _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu 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=-2.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 4C48AC4332B for ; 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Tue, 24 Mar 2020 18:55:18 +1100 (AEDT) Received: by verein.lst.de (Postfix, from userid 2407) id 038C268BFE; Tue, 24 Mar 2020 08:55:15 +0100 (CET) Date: Tue, 24 Mar 2020 08:55:14 +0100 From: Christoph Hellwig To: "Aneesh Kumar K.V" Subject: Re: [PATCH 1/2] dma-mapping: add a dma_ops_bypass flag to struct device Message-ID: <20200324075514.GK23447@lst.de> References: <20200320141640.366360-1-hch@lst.de> <20200320141640.366360-2-hch@lst.de> <2f31d0dd-aa7e-8b76-c8a1-5759fda5afc9@ozlabs.ru> <20200323083705.GA31245@lst.de> <20200323085059.GA32528@lst.de> <87sghz2ibh.fsf@linux.ibm.com> <20200323172256.GB31269@lst.de> <87pnd22rke.fsf@linux.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <87pnd22rke.fsf@linux.ibm.com> User-Agent: Mutt/1.5.17 (2007-11-01) X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Alexey Kardashevskiy , Greg Kroah-Hartman , Joerg Roedel , Robin Murphy , linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, linuxppc-dev@lists.ozlabs.org, Christoph Hellwig , Lu Baolu Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Tue, Mar 24, 2020 at 12:00:09PM +0530, Aneesh Kumar K.V wrote: > dma_addr_t dma_direct_map_page(struct device *dev, struct page *page, > unsigned long offset, size_t size, enum dma_data_direction dir, > unsigned long attrs) > { > phys_addr_t phys = page_to_phys(page) + offset; > dma_addr_t dma_addr = phys_to_dma(dev, phys); > > if (unlikely(!dma_capable(dev, dma_addr, size, true))) { > return iommu_map(dev, phys, size, dir, attrs); > > return DMA_MAPPING_ERROR; If powerpc hardware / firmware people really come up with crap that stupid you'll have to handle it yourself and will always pay the indirect call penality. 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=-2.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 E3A05C4332B for ; Tue, 24 Mar 2020 07:55:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C183120724 for ; Tue, 24 Mar 2020 07:55:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727547AbgCXHzQ (ORCPT ); Tue, 24 Mar 2020 03:55:16 -0400 Received: from verein.lst.de ([213.95.11.211]:34316 "EHLO verein.lst.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727426AbgCXHzQ (ORCPT ); Tue, 24 Mar 2020 03:55:16 -0400 Received: by verein.lst.de (Postfix, from userid 2407) id 038C268BFE; Tue, 24 Mar 2020 08:55:15 +0100 (CET) Date: Tue, 24 Mar 2020 08:55:14 +0100 From: Christoph Hellwig To: "Aneesh Kumar K.V" Cc: Alexey Kardashevskiy , Christoph Hellwig , iommu@lists.linux-foundation.org, linuxppc-dev@lists.ozlabs.org, Lu Baolu , Greg Kroah-Hartman , Joerg Roedel , Robin Murphy , linux-kernel@vger.kernel.org Subject: Re: [PATCH 1/2] dma-mapping: add a dma_ops_bypass flag to struct device Message-ID: <20200324075514.GK23447@lst.de> References: <20200320141640.366360-1-hch@lst.de> <20200320141640.366360-2-hch@lst.de> <2f31d0dd-aa7e-8b76-c8a1-5759fda5afc9@ozlabs.ru> <20200323083705.GA31245@lst.de> <20200323085059.GA32528@lst.de> <87sghz2ibh.fsf@linux.ibm.com> <20200323172256.GB31269@lst.de> <87pnd22rke.fsf@linux.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <87pnd22rke.fsf@linux.ibm.com> User-Agent: Mutt/1.5.17 (2007-11-01) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Mar 24, 2020 at 12:00:09PM +0530, Aneesh Kumar K.V wrote: > dma_addr_t dma_direct_map_page(struct device *dev, struct page *page, > unsigned long offset, size_t size, enum dma_data_direction dir, > unsigned long attrs) > { > phys_addr_t phys = page_to_phys(page) + offset; > dma_addr_t dma_addr = phys_to_dma(dev, phys); > > if (unlikely(!dma_capable(dev, dma_addr, size, true))) { > return iommu_map(dev, phys, size, dir, attrs); > > return DMA_MAPPING_ERROR; If powerpc hardware / firmware people really come up with crap that stupid you'll have to handle it yourself and will always pay the indirect call penality.