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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 11/25] iommu/tegra-smmu: Implement an IDENTITY 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: <11-v6-e8114faedade+425-iommu_all_defdom_jgg@nvidia.com> From: Baolu Lu In-Reply-To: <11-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-s390@vger.kernel.org On 2023/8/3 8:07, Jason Gunthorpe wrote: > What tegra-smmu does during tegra_smmu_set_platform_dma() is actually > putting the iommu into identity mode. > > Move to the new core support for ARM_DMA_USE_IOMMU by defining > ops->identity_domain. > > Signed-off-by: Jason Gunthorpe > --- > drivers/iommu/tegra-smmu.c | 37 ++++++++++++++++++++++++++++++++----- > 1 file changed, 32 insertions(+), 5 deletions(-) > > diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c > index 1cbf063ccf147a..f63f1d4f0bd10f 100644 > --- a/drivers/iommu/tegra-smmu.c > +++ b/drivers/iommu/tegra-smmu.c > @@ -511,23 +511,39 @@ static int tegra_smmu_attach_dev(struct iommu_domain *domain, > return err; > } > > -static void tegra_smmu_set_platform_dma(struct device *dev) > +static int tegra_smmu_identity_attach(struct iommu_domain *identity_domain, > + struct device *dev) > { > struct iommu_domain *domain = iommu_get_domain_for_dev(dev); > struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); > - struct tegra_smmu_as *as = to_smmu_as(domain); > - struct tegra_smmu *smmu = as->smmu; > + struct tegra_smmu_as *as; > + struct tegra_smmu *smmu; > unsigned int index; > > if (!fwspec) > - return; > + return -ENODEV; > > + if (domain == identity_domain || !domain) > + return 0; > + > + as = to_smmu_as(domain); > + smmu = as->smmu; > for (index = 0; index < fwspec->num_ids; index++) { > tegra_smmu_disable(smmu, fwspec->ids[index], as->id); > tegra_smmu_as_unprepare(smmu, as); > } > + return 0; > } > > +static struct iommu_domain_ops tegra_smmu_identity_ops = { > + .attach_dev = tegra_smmu_identity_attach, > +}; > + > +static struct iommu_domain tegra_smmu_identity_domain = { > + .type = IOMMU_DOMAIN_IDENTITY, > + .ops = &tegra_smmu_identity_ops, > +}; > + > static void tegra_smmu_set_pde(struct tegra_smmu_as *as, unsigned long iova, > u32 value) > { > @@ -962,11 +978,22 @@ static int tegra_smmu_of_xlate(struct device *dev, > return iommu_fwspec_add_ids(dev, &id, 1); > } > > +static int tegra_smmu_def_domain_type(struct device *dev) > +{ > + /* > + * FIXME: For now we want to run all translation in IDENTITY mode, due > + * to some device quirks. Better would be to just quirk the troubled > + * devices. > + */ > + return IOMMU_DOMAIN_IDENTITY; > +} Hope somebody can fix this later on. Reviewed-by: Lu Baolu Best regards, baolu