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X-IronPort-AV: E=McAfee;i="6600,9927,10801"; a="369445399" X-IronPort-AV: E=Sophos;i="6.01,171,1684825200"; d="scan'208";a="369445399" Received: from orsmga004.jf.intel.com ([10.7.209.38]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 Aug 2023 23:45:05 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10801"; a="856979583" X-IronPort-AV: E=Sophos;i="6.01,171,1684825200"; d="scan'208";a="856979583" Received: from blu2-mobl.ccr.corp.intel.com (HELO [10.254.215.205]) ([10.254.215.205]) by orsmga004-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 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 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 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: Thierry Reding , Niklas Schnelle , Steven Price , Nicolin Chen , Dmitry Osipenko , baolu.lu@linux.intel.com, Marek Szyprowski Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" 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