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([2a01:e0a:59e:9d80:527b:9dff:feef:3874]) by smtp.gmail.com with ESMTPSA id v8sm2207321wrt.12.2021.09.22.06.42.56 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 22 Sep 2021 06:42:57 -0700 (PDT) Reply-To: eric.auger@redhat.com Subject: Re: [RFC 09/20] iommu: Add page size and address width attributes To: Liu Yi L , alex.williamson@redhat.com, jgg@nvidia.com, hch@lst.de, jasowang@redhat.com, joro@8bytes.org Cc: jean-philippe@linaro.org, kevin.tian@intel.com, parav@mellanox.com, lkml@metux.net, pbonzini@redhat.com, lushenming@huawei.com, corbet@lwn.net, ashok.raj@intel.com, yi.l.liu@linux.intel.com, jun.j.tian@intel.com, hao.wu@intel.com, dave.jiang@intel.com, jacob.jun.pan@linux.intel.com, kwankhede@nvidia.com, robin.murphy@arm.com, kvm@vger.kernel.org, iommu@lists.linux-foundation.org, dwmw2@infradead.org, linux-kernel@vger.kernel.org, baolu.lu@linux.intel.com, david@gibson.dropbear.id.au, nicolinc@nvidia.com References: <20210919063848.1476776-1-yi.l.liu@intel.com> <20210919063848.1476776-10-yi.l.liu@intel.com> From: Eric Auger Message-ID: Date: Wed, 22 Sep 2021 15:42:55 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.10.1 MIME-Version: 1.0 In-Reply-To: <20210919063848.1476776-10-yi.l.liu@intel.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Content-Language: en-US Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, On 9/19/21 8:38 AM, Liu Yi L wrote: > From: Lu Baolu > > This exposes PAGE_SIZE and ADDR_WIDTH attributes. The iommufd could use > them to define the IOAS. > > Signed-off-by: Lu Baolu > --- > include/linux/iommu.h | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/include/linux/iommu.h b/include/linux/iommu.h > index 943de6897f56..86d34e4ce05e 100644 > --- a/include/linux/iommu.h > +++ b/include/linux/iommu.h > @@ -153,9 +153,13 @@ enum iommu_dev_features { > /** > * enum iommu_devattr - Per device IOMMU attributes > * @IOMMU_DEV_INFO_FORCE_SNOOP [bool]: IOMMU can force DMA to be snooped. > + * @IOMMU_DEV_INFO_PAGE_SIZE [u64]: Page sizes that iommu supports. > + * @IOMMU_DEV_INFO_ADDR_WIDTH [u32]: Address width supported. I think this deserves additional info. What address width do we talk about, input, output, what stage if the IOMMU does support multiple stages Thanks Eric > */ > enum iommu_devattr { > IOMMU_DEV_INFO_FORCE_SNOOP, > + IOMMU_DEV_INFO_PAGE_SIZE, > + IOMMU_DEV_INFO_ADDR_WIDTH, > }; > > #define IOMMU_PASID_INVALID (-1U)