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=-6.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable 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 410F4C3F2D1 for ; Wed, 4 Mar 2020 14:09:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1418220848 for ; Wed, 4 Mar 2020 14:09:50 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="g8SWXvPT" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726440AbgCDOJt (ORCPT ); Wed, 4 Mar 2020 09:09:49 -0500 Received: from mail-wr1-f68.google.com ([209.85.221.68]:35838 "EHLO mail-wr1-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726275AbgCDOJt (ORCPT ); Wed, 4 Mar 2020 09:09:49 -0500 Received: by mail-wr1-f68.google.com with SMTP id r7so2583700wro.2 for ; Wed, 04 Mar 2020 06:09:48 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=EpXtvX1PfW3FZz13OtRHOjQvZ2fsaz2TnoP+n0E2ZUg=; b=g8SWXvPTyPZzLcsUAC4+i3gEYS7VjOjujoBVioj8kKYK73oXfKh+MAvo8mRWnu071C gxiMmhvSdwjKzrw34AWvhgikZX0Hrhz4jre0uVLyzI7CZYL/VDsf5gHJObclPdLagxZi s+6qEVWA3DXyXew+YkVb+rgAVC49YN8D3mPAbPfbz2b2vq1fO6ty0UB+H65pdv6FjJ6Y v3/70bPC/jxD75YgWO2V9B7pyWv0bv8SImmbScC8XftPtCDEBeJXHlj8SYkcVTIy6y7V 32lZyBoyNgNFy1f0QHfB5NbM0+cCHEojMhPDvMZmAXMM6fqrb+f7yzzdQe1b3vIru/ak r5Hg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=EpXtvX1PfW3FZz13OtRHOjQvZ2fsaz2TnoP+n0E2ZUg=; b=m7XUKefnW9HwPXgzLZSL8fyPsx+w7mrq04IfSavFSAF2xb2k3sizSl4GrA4zksh4La WV3JBioSbCN8R4OtZmJ+6wcWRtbLhkyTb/vanJhCtF5X5FDZev3xXtp5Yj0izT0cDDvd wfVKIJpriMRYIesKEBre8wJcsu/0TrpoxLZA1q7vkBJpZd0utuHXPoGn4EOevJITvQBh Tmwcx6oAcomTwz5sDmG+IkR++Q9MmykfFnVmlkd2lcYBcIT5fCeR4QP2q86YTbtJJmyn PLpiRVc9M0g6Ltdua0bD0/xjNom/CafC9bsbOX3aWNM91Iit16XHDo1lK9/Xg6wM8XeV DLJQ== X-Gm-Message-State: ANhLgQ3E+qo8FxYYIY/X85VcvpBcAJemMJpfnjfSOZvRnR4VXJlP6+3M cIVt1HqIgnSxdhJOESaBeHAzKg== X-Google-Smtp-Source: ADFU+vtZMIq6Jg8tdrdLMObmNELyKi8gzYZ2wKQ8Qt7PTkGgWzXVAaeuMwK7RkrXzELghSD1BcL3DQ== X-Received: by 2002:adf:e542:: with SMTP id z2mr4532686wrm.150.1583330987727; Wed, 04 Mar 2020 06:09:47 -0800 (PST) Received: from myrica ([2001:171b:c9a8:fbc0:116c:c27a:3e7f:5eaf]) by smtp.gmail.com with ESMTPSA id q12sm41792293wrg.71.2020.03.04.06.09.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 04 Mar 2020 06:09:46 -0800 (PST) Date: Wed, 4 Mar 2020 15:09:40 +0100 From: Jean-Philippe Brucker To: Xu Zaibo Cc: iommu@lists.linux-foundation.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-pci@vger.kernel.org, linux-mm@kvack.org, mark.rutland@arm.com, kevin.tian@intel.com, Jean-Philippe Brucker , catalin.marinas@arm.com, robin.murphy@arm.com, robh+dt@kernel.org, zhangfei.gao@linaro.org, will@kernel.org, christian.koenig@amd.com Subject: Re: [PATCH v4 23/26] iommu/arm-smmu-v3: Add stall support for platform devices Message-ID: <20200304140940.GC646000@myrica> References: <20200224182401.353359-1-jean-philippe@linaro.org> <20200224182401.353359-24-jean-philippe@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org On Wed, Feb 26, 2020 at 04:44:53PM +0800, Xu Zaibo wrote: > Hi, > > > On 2020/2/25 2:23, Jean-Philippe Brucker wrote: > > From: Jean-Philippe Brucker > > > > The SMMU provides a Stall model for handling page faults in platform > > devices. It is similar to PCI PRI, but doesn't require devices to have > > their own translation cache. Instead, faulting transactions are parked and > > the OS is given a chance to fix the page tables and retry the transaction. > > > > Enable stall for devices that support it (opt-in by firmware). When an > > event corresponds to a translation error, call the IOMMU fault handler. If > > the fault is recoverable, it will call us back to terminate or continue > > the stall. > > > > Signed-off-by: Jean-Philippe Brucker > > --- > > drivers/iommu/arm-smmu-v3.c | 271 ++++++++++++++++++++++++++++++++++-- > > drivers/iommu/of_iommu.c | 5 +- > > include/linux/iommu.h | 2 + > > 3 files changed, 269 insertions(+), 9 deletions(-) > > > > diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c > > index 6a5987cce03f..da5dda5ba26a 100644 > > --- a/drivers/iommu/arm-smmu-v3.c > > +++ b/drivers/iommu/arm-smmu-v3.c > > @@ -374,6 +374,13 @@ > > #define CMDQ_PRI_1_GRPID GENMASK_ULL(8, 0) > > #define CMDQ_PRI_1_RESP GENMASK_ULL(13, 12) > [...] > > +static int arm_smmu_page_response(struct device *dev, > > + struct iommu_fault_event *unused, > > + struct iommu_page_response *resp) > > +{ > > + struct arm_smmu_cmdq_ent cmd = {0}; > > + struct arm_smmu_master *master = dev_iommu_fwspec_get(dev)->iommu_priv; > Here can use 'dev_to_master' ? Certainly, good catch Thanks, Jean