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=-7.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS autolearn=ham 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 1C272C282CE for ; Fri, 5 Apr 2019 18:08:46 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id DFDBF2146F for ; Fri, 5 Apr 2019 18:08:45 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="mspqHLZC" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org DFDBF2146F Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender:Content-Type: Content-Transfer-Encoding:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:Date:Message-ID:From: References:To:Subject:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=xf9ubo86FmkE7nz5Tp3HepWWHSdvZxeOqRBuZzDrGS8=; b=mspqHLZClmbtoGCyoPmKIvWLz lne836jIRBUXOsZwiW2GxzzKEvVpnpgynacrRAcj1vhm3Iz2WThV2CXbZrNkgzC2+/BnOm2O+i/Lf S4jKQGuGNaD2cKm8HcoE2l03d7c5Ny6cxpohDT7/2zro/nZ4TMr2Iw8wWtzHUirV1Jm5dntikgwMG TD7i5VW5I1a1AJAP4lhfpKBNu5rTv7pZlS9+LVyoYyuNtBTTMuH1k+prY5v68uwtaPhMkKLfxbqt3 Cq00hW62YV5cWHB6eN15v8bbfoKOFs7luJqMKnKfWEW8iDS/4wZsZhwG+yljyg7nd+YnV6Ynrz6av tJ50N0c5Q==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1hCTGa-0004Tj-A8; Fri, 05 Apr 2019 18:08:40 +0000 Received: from usa-sjc-mx-foss1.foss.arm.com ([217.140.101.70] helo=foss.arm.com) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1hCTGX-0004TI-Js for linux-arm-kernel@lists.infradead.org; Fri, 05 Apr 2019 18:08:39 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 1C688168F; Fri, 5 Apr 2019 11:08:37 -0700 (PDT) Received: from [10.1.196.75] (e110467-lin.cambridge.arm.com [10.1.196.75]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id B863D3F557; Fri, 5 Apr 2019 11:08:35 -0700 (PDT) Subject: Re: [PATCH 06/21] dma-iommu: use for_each_sg in iommu_dma_alloc To: Christoph Hellwig References: <20190327080448.5500-1-hch@lst.de> <20190327080448.5500-7-hch@lst.de> From: Robin Murphy Message-ID: Date: Fri, 5 Apr 2019 19:08:34 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: <20190327080448.5500-7-hch@lst.de> Content-Language: en-GB X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190405_110837_651216_7A2481A2 X-CRM114-Status: GOOD ( 23.94 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Tom Lendacky , Catalin Marinas , Joerg Roedel , Will Deacon , linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, linux-arm-kernel@lists.infradead.org Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 27/03/2019 08:04, Christoph Hellwig wrote: > arch_dma_prep_coherent can handle physically contiguous ranges larger > than PAGE_SIZE just fine, which means we don't need a page-based > iterator. Heh, I got several minutes into writing a "but highmem..." reply before finding csky's arch_dma_prep_coherent() implementation. And of course that's why it specifically takes a page instead of any addresses. In hindsight I now have no idea why I didn't just write the flush_page() logic to work that way in the first place... Reviewed-by: Robin Murphy > Signed-off-by: Christoph Hellwig > --- > drivers/iommu/dma-iommu.c | 14 +++++--------- > 1 file changed, 5 insertions(+), 9 deletions(-) > > diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c > index 77d704c8f565..f915cb7c46e6 100644 > --- a/drivers/iommu/dma-iommu.c > +++ b/drivers/iommu/dma-iommu.c > @@ -577,15 +577,11 @@ struct page **iommu_dma_alloc(struct device *dev, size_t size, gfp_t gfp, > goto out_free_iova; > > if (!(prot & IOMMU_CACHE)) { > - struct sg_mapping_iter miter; > - /* > - * The CPU-centric flushing implied by SG_MITER_TO_SG isn't > - * sufficient here, so skip it by using the "wrong" direction. > - */ > - sg_miter_start(&miter, sgt.sgl, sgt.orig_nents, SG_MITER_FROM_SG); > - while (sg_miter_next(&miter)) > - arch_dma_prep_coherent(miter.page, PAGE_SIZE); > - sg_miter_stop(&miter); > + struct scatterlist *sg; > + int i; > + > + for_each_sg(sgt.sgl, sg, sgt.orig_nents, i) > + arch_dma_prep_coherent(sg_page(sg), sg->length); > } > > if (iommu_map_sg(domain, iova, sgt.sgl, sgt.orig_nents, prot) > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel