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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4FA29C41513 for ; Mon, 14 Aug 2023 06:45:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229882AbjHNGpZ (ORCPT ); Mon, 14 Aug 2023 02:45:25 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33420 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234034AbjHNGpT (ORCPT ); Mon, 14 Aug 2023 02:45:19 -0400 Received: from mgamail.intel.com (mgamail.intel.com [192.55.52.93]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F26C1E5C; Sun, 13 Aug 2023 23:45:18 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1691995519; x=1723531519; h=message-id:date:mime-version:cc:subject:to:references: from:in-reply-to:content-transfer-encoding; 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13 Aug 2023 23:44:52 -0700 Message-ID: Date: Mon, 14 Aug 2023 14:44:50 +0800 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:102.0) Gecko/20100101 Thunderbird/102.14.0 Cc: baolu.lu@linux.intel.com, Dmitry Osipenko , Marek Szyprowski , Nicolin Chen , Niklas Schnelle , Steven Price , Thierry Reding Subject: Re: [PATCH v6 20/25] iommu/sun50i: Add an IOMMU_IDENTITIY_DOMAIN Content-Language: en-US To: Jason Gunthorpe , Andy Gross , Alim Akhtar , Bjorn Andersson , AngeloGioacchino Del Regno , Baolin Wang , Christophe Leroy , Gerald Schaefer , Heiko Stuebner , iommu@lists.linux.dev, Jernej Skrabec , Jonathan Hunter , Joerg Roedel , Kevin Tian , Konrad Dybcio , Krzysztof Kozlowski , linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, linux-mediatek@lists.infradead.org, linux-rockchip@lists.infradead.org, linux-s390@vger.kernel.org, linux-samsung-soc@vger.kernel.org, linux-sunxi@lists.linux.dev, linux-tegra@vger.kernel.org, Russell King , linuxppc-dev@lists.ozlabs.org, Matthias Brugger , Matthew Rosato , Michael Ellerman , Nicholas Piggin , Orson Zhai , Rob Clark , Robin Murphy , Samuel Holland , Thierry Reding , Krishna Reddy , Chen-Yu Tsai , Will Deacon , Yong Wu , Chunyan Zhang References: <20-v6-e8114faedade+425-iommu_all_defdom_jgg@nvidia.com> From: Baolu Lu In-Reply-To: <20-v6-e8114faedade+425-iommu_all_defdom_jgg@nvidia.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org On 2023/8/3 8:08, Jason Gunthorpe wrote: > Prior to commit 1b932ceddd19 ("iommu: Remove detach_dev callbacks") the > sun50i_iommu_detach_device() function was being called by > ops->detach_dev(). > > This is an IDENTITY domain so convert sun50i_iommu_detach_device() into > sun50i_iommu_identity_attach() and a full IDENTITY domain and thus hook it > back up the same was as the old ops->detach_dev(). > > Signed-off-by: Jason Gunthorpe > --- > drivers/iommu/sun50i-iommu.c | 26 +++++++++++++++++++------- > 1 file changed, 19 insertions(+), 7 deletions(-) > > diff --git a/drivers/iommu/sun50i-iommu.c b/drivers/iommu/sun50i-iommu.c > index 74c5cb93e90027..0bf08b120cf105 100644 > --- a/drivers/iommu/sun50i-iommu.c > +++ b/drivers/iommu/sun50i-iommu.c > @@ -757,21 +757,32 @@ static void sun50i_iommu_detach_domain(struct sun50i_iommu *iommu, > iommu->domain = NULL; > } > > -static void sun50i_iommu_detach_device(struct iommu_domain *domain, > - struct device *dev) > +static int sun50i_iommu_identity_attach(struct iommu_domain *identity_domain, > + struct device *dev) > { > - struct sun50i_iommu_domain *sun50i_domain = to_sun50i_domain(domain); > struct sun50i_iommu *iommu = dev_iommu_priv_get(dev); > + struct sun50i_iommu_domain *sun50i_domain; > > dev_dbg(dev, "Detaching from IOMMU domain\n"); > > - if (iommu->domain != domain) > - return; > + if (iommu->domain == identity_domain) > + return 0; > > + sun50i_domain = to_sun50i_domain(iommu->domain); > if (refcount_dec_and_test(&sun50i_domain->refcnt)) > sun50i_iommu_detach_domain(iommu, sun50i_domain); > + return 0; > } Does iommu->domain need to be set to identity_domain before returning? Best regards, baolu