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Date: Wed, 5 Jun 2024 12:57:46 -0700 Message-Id: <530cd10360e180a3b8303319ac40a998312e02b0.1717612299.git.tjeznach@rivosinc.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Advertise IOMMU device and its core API. Only minimal implementation for single identity domain type, without per-group domain protection. Reviewed-by: Lu Baolu Reviewed-by: Zong Li Signed-off-by: Tomasz Jeznach --- drivers/iommu/riscv/iommu.c | 66 +++++++++++++++++++++++++++++++++++++ 1 file changed, 66 insertions(+) diff --git a/drivers/iommu/riscv/iommu.c b/drivers/iommu/riscv/iommu.c index 223314f7ed0a..c54088bf138f 100644 --- a/drivers/iommu/riscv/iommu.c +++ b/drivers/iommu/riscv/iommu.c @@ -17,6 +17,7 @@ #include #include #include +#include =20 #include "iommu-bits.h" #include "iommu.h" @@ -36,6 +37,60 @@ static void riscv_iommu_disable(struct riscv_iommu_devic= e *iommu) riscv_iommu_writel(iommu, RISCV_IOMMU_REG_PQCSR, 0); } =20 +static int riscv_iommu_attach_identity_domain(struct iommu_domain *iommu_d= omain, + struct device *dev) +{ + /* Global pass-through already enabled, do nothing for now. */ + return 0; +} + +static struct iommu_domain riscv_iommu_identity_domain =3D { + .type =3D IOMMU_DOMAIN_IDENTITY, + .ops =3D &(const struct iommu_domain_ops) { + .attach_dev =3D riscv_iommu_attach_identity_domain, + } +}; + +static int riscv_iommu_device_domain_type(struct device *dev) +{ + return IOMMU_DOMAIN_IDENTITY; +} + +static struct iommu_group *riscv_iommu_device_group(struct device *dev) +{ + if (dev_is_pci(dev)) + return pci_device_group(dev); + return generic_device_group(dev); +} + +static int riscv_iommu_of_xlate(struct device *dev, const struct of_phandl= e_args *args) +{ + return iommu_fwspec_add_ids(dev, args->args, 1); +} + +static struct iommu_device *riscv_iommu_probe_device(struct device *dev) +{ + struct iommu_fwspec *fwspec =3D dev_iommu_fwspec_get(dev); + struct riscv_iommu_device *iommu; + + if (!fwspec || !fwspec->iommu_fwnode->dev || !fwspec->num_ids) + return ERR_PTR(-ENODEV); + + iommu =3D dev_get_drvdata(fwspec->iommu_fwnode->dev); + if (!iommu) + return ERR_PTR(-ENODEV); + + return &iommu->iommu; +} + +static const struct iommu_ops riscv_iommu_ops =3D { + .of_xlate =3D riscv_iommu_of_xlate, + .identity_domain =3D &riscv_iommu_identity_domain, + .def_domain_type =3D riscv_iommu_device_domain_type, + .device_group =3D riscv_iommu_device_group, + .probe_device =3D riscv_iommu_probe_device, +}; + static int riscv_iommu_init_check(struct riscv_iommu_device *iommu) { u64 ddtp; @@ -74,6 +129,7 @@ static int riscv_iommu_init_check(struct riscv_iommu_dev= ice *iommu) =20 void riscv_iommu_remove(struct riscv_iommu_device *iommu) { + iommu_device_unregister(&iommu->iommu); iommu_device_sysfs_remove(&iommu->iommu); } =20 @@ -99,5 +155,15 @@ int riscv_iommu_init(struct riscv_iommu_device *iommu) return dev_err_probe(iommu->dev, rc, "cannot register sysfs interface\n"); =20 + rc =3D iommu_device_register(&iommu->iommu, &riscv_iommu_ops, iommu->dev); + if (rc) { + dev_err_probe(iommu->dev, rc, "cannot register iommu interface\n"); + goto err_remove_sysfs; + } + return 0; + +err_remove_sysfs: + iommu_device_sysfs_remove(&iommu->iommu); + return rc; } --=20 2.34.1