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X-IronPort-AV: E=McAfee;i="6600,9927,10782"; a="357971220" X-IronPort-AV: E=Sophos;i="6.01,231,1684825200"; d="scan'208";a="357971220" Received: from orsmga001.jf.intel.com ([10.7.209.18]) by orsmga101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Jul 2023 03:02:25 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10782"; a="761594570" X-IronPort-AV: E=Sophos;i="6.01,231,1684825200"; d="scan'208";a="761594570" Received: from blu2-mobl.ccr.corp.intel.com (HELO [10.254.208.129]) ([10.254.208.129]) by orsmga001-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Jul 2023 03:02:14 -0700 Message-ID: <1d6e3aba-bdbc-7b56-2f9c-eda6017dbbb5@linux.intel.com> Date: Wed, 26 Jul 2023 18:02:12 +0800 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:102.0) Gecko/20100101 Thunderbird/102.13.0 Subject: Re: [PATCH v5 23/25] iommu: Add ops->domain_alloc_paging() 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: <23-v5-d0a204c678c7+3d16a-iommu_all_defdom_jgg@nvidia.com> From: Baolu Lu In-Reply-To: <23-v5-d0a204c678c7+3d16a-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 2023/7/25 1:22, Jason Gunthorpe wrote: > This callback requests the driver to create only a __IOMMU_DOMAIN_PAGING > domain, so it saves a few lines in a lot of drivers needlessly checking > the type. > > More critically, this allows us to sweep out all the > IOMMU_DOMAIN_UNMANAGED and IOMMU_DOMAIN_DMA checks from a lot of the > drivers, simplifying what is going on in the code and ultimately removing > the now-unused special cases in drivers where they did not support > IOMMU_DOMAIN_DMA. > > domain_alloc_paging() should return a struct iommu_domain that is > functionally compatible with ARM_DMA_USE_IOMMU, dma-iommu.c and iommufd. > > Be forwards looking and pass in a 'struct device *' argument. We can > provide this when allocating the default_domain. No drivers will look at > this. > > Tested-by: Steven Price > Tested-by: Marek Szyprowski > Tested-by: Nicolin Chen > Signed-off-by: Jason Gunthorpe > --- > drivers/iommu/iommu.c | 13 ++++++++++--- > include/linux/iommu.h | 3 +++ > 2 files changed, 13 insertions(+), 3 deletions(-) Reviewed-by: Lu Baolu