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Wed, 16 Sep 2020 07:11:46 -0700 (PDT) Date: Wed, 16 Sep 2020 16:11:28 +0200 From: Jean-Philippe Brucker To: Zenghui Yu 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, fenghua.yu@intel.com, kevin.tian@intel.com, jacob.jun.pan@linux.intel.com, jgg@ziepe.ca, catalin.marinas@arm.com, joro@8bytes.org, robin.murphy@arm.com, hch@infradead.org, zhangfei.gao@linaro.org, Jonathan.Cameron@huawei.com, felix.kuehling@amd.com, xuzaibo@huawei.com, will@kernel.org, christian.koenig@amd.com, baolu.lu@linux.intel.com Subject: Re: [PATCH v7 18/24] iommu/arm-smmu-v3: Add support for Hardware Translation Table Update Message-ID: <20200916141128.GC5316@myrica> References: <20200519175502.2504091-1-jean-philippe@linaro.org> <20200519175502.2504091-19-jean-philippe@linaro.org> <472fdcf6-f306-60bc-5813-4ad421ee03f2@huawei.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <472fdcf6-f306-60bc-5813-4ad421ee03f2@huawei.com> X-Rspamd-Queue-Id: 145F6100E5A5C X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam03 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Fri, Aug 28, 2020 at 05:28:22PM +0800, Zenghui Yu wrote: > On 2020/5/20 1:54, Jean-Philippe Brucker wrote: > > @@ -4454,6 +4470,12 @@ static int arm_smmu_device_hw_probe(struct arm_smmu_device *smmu) > > smmu->features |= ARM_SMMU_FEAT_E2H; > > } > > + if (reg & (IDR0_HA | IDR0_HD)) { > > + smmu->features |= ARM_SMMU_FEAT_HA; > > + if (reg & IDR0_HD) > > + smmu->features |= ARM_SMMU_FEAT_HD; > > + } > > + > > nitpick: > > As per the IORT spec (DEN0049D, 3.1.1.2 SMMUv3 node, Table 10), the > "HTTU Override" flag of the SMMUv3 node can override the value in > SMMU_IDR0.HTTU. You may want to check this bit before selecting the > {HA,HD} features and shout if there is a mismatch between firmware and > the SMMU implementation. Just like how ARM_SMMU_FEAT_COHERENCY is > selected. Thanks for pointing this out, I didn't know about these flags but have added them to the patch now. Thanks, Jean