Message ID | b28d4fe49c5fe4e3ece9de789cfd92cfa5b3c16c.1714752293.git.tjeznach@rivosinc.com (mailing list archive) |
---|---|
State | Superseded |
Headers | show |
Series | Linux RISC-V IOMMU Support | expand |
On Sat, May 4, 2024 at 12:13 AM Tomasz Jeznach <tjeznach@rivosinc.com> wrote: > > Advertise IOMMU device and its core API. > Only minimal implementation for single identity domain type, without > per-group domain protection. > > Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com> > Signed-off-by: Tomasz Jeznach <tjeznach@rivosinc.com> > --- > 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 3c5a6b49669d..1f889daffb0e 100644 > --- a/drivers/iommu/riscv/iommu.c > +++ b/drivers/iommu/riscv/iommu.c > @@ -17,6 +17,7 @@ > #include <linux/init.h> > #include <linux/iommu.h> > #include <linux/kernel.h> > +#include <linux/pci.h> > > #include "iommu-bits.h" > #include "iommu.h" > @@ -36,6 +37,60 @@ static void riscv_iommu_disable(struct riscv_iommu_device *iommu) > riscv_iommu_writel(iommu, RISCV_IOMMU_REG_PQCSR, 0); > } > > +static int riscv_iommu_attach_identity_domain(struct iommu_domain *iommu_domain, > + struct device *dev) > +{ > + /* Global pass-through already enabled, do nothing for now. */ > + return 0; > +} > + > +static struct iommu_domain riscv_iommu_identity_domain = { > + .type = IOMMU_DOMAIN_IDENTITY, > + .ops = &(const struct iommu_domain_ops) { > + .attach_dev = 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_phandle_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 = dev_iommu_fwspec_get(dev); > + struct riscv_iommu_device *iommu; > + > + if (!fwspec->iommu_fwnode->dev || !fwspec->num_ids) > + return ERR_PTR(-ENODEV); It seems to me that we might need to ensure fwspec is not NULL before accessing fwspec->iommu_fwnode, otherwise, it will cause NULL pointer dereference. > + > + iommu = dev_get_drvdata(fwspec->iommu_fwnode->dev); > + if (!iommu) > + return ERR_PTR(-ENODEV); > + > + return &iommu->iommu; > +} > + > +static const struct iommu_ops riscv_iommu_ops = { > + .of_xlate = riscv_iommu_of_xlate, > + .identity_domain = &riscv_iommu_identity_domain, > + .def_domain_type = riscv_iommu_device_domain_type, > + .device_group = riscv_iommu_device_group, > + .probe_device = riscv_iommu_probe_device, > +}; > + > static int riscv_iommu_init_check(struct riscv_iommu_device *iommu) > { > u64 ddtp; > @@ -71,6 +126,7 @@ static int riscv_iommu_init_check(struct riscv_iommu_device *iommu) > > void riscv_iommu_remove(struct riscv_iommu_device *iommu) > { > + iommu_device_unregister(&iommu->iommu); > iommu_device_sysfs_remove(&iommu->iommu); > } > > @@ -95,5 +151,15 @@ int riscv_iommu_init(struct riscv_iommu_device *iommu) > return dev_err_probe(iommu->dev, rc, > "cannot register sysfs interface\n"); > > + rc = 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; > } > -- > 2.34.1 > > > _______________________________________________ > linux-riscv mailing list > linux-riscv@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-riscv
On Mon, May 13, 2024 at 10:56 PM Zong Li <zong.li@sifive.com> wrote: > > On Sat, May 4, 2024 at 12:13 AM Tomasz Jeznach <tjeznach@rivosinc.com> wrote: > > > > Advertise IOMMU device and its core API. > > Only minimal implementation for single identity domain type, without > > per-group domain protection. > > > > Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com> > > Signed-off-by: Tomasz Jeznach <tjeznach@rivosinc.com> > > --- > > 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 3c5a6b49669d..1f889daffb0e 100644 > > --- a/drivers/iommu/riscv/iommu.c > > +++ b/drivers/iommu/riscv/iommu.c > > @@ -17,6 +17,7 @@ > > #include <linux/init.h> > > #include <linux/iommu.h> > > #include <linux/kernel.h> > > +#include <linux/pci.h> > > > > #include "iommu-bits.h" > > #include "iommu.h" > > @@ -36,6 +37,60 @@ static void riscv_iommu_disable(struct riscv_iommu_device *iommu) > > riscv_iommu_writel(iommu, RISCV_IOMMU_REG_PQCSR, 0); > > } > > > > +static int riscv_iommu_attach_identity_domain(struct iommu_domain *iommu_domain, > > + struct device *dev) > > +{ > > + /* Global pass-through already enabled, do nothing for now. */ > > + return 0; > > +} > > + > > +static struct iommu_domain riscv_iommu_identity_domain = { > > + .type = IOMMU_DOMAIN_IDENTITY, > > + .ops = &(const struct iommu_domain_ops) { > > + .attach_dev = 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_phandle_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 = dev_iommu_fwspec_get(dev); > > + struct riscv_iommu_device *iommu; > > + > > + if (!fwspec->iommu_fwnode->dev || !fwspec->num_ids) > > + return ERR_PTR(-ENODEV); > > It seems to me that we might need to ensure fwspec is not NULL before > accessing fwspec->iommu_fwnode, otherwise, it will cause NULL pointer > dereference. > Thank you. Fix applied to v5. > > + > > + iommu = dev_get_drvdata(fwspec->iommu_fwnode->dev); > > + if (!iommu) > > + return ERR_PTR(-ENODEV); > > + > > + return &iommu->iommu; > > +} > > + > > +static const struct iommu_ops riscv_iommu_ops = { > > + .of_xlate = riscv_iommu_of_xlate, > > + .identity_domain = &riscv_iommu_identity_domain, > > + .def_domain_type = riscv_iommu_device_domain_type, > > + .device_group = riscv_iommu_device_group, > > + .probe_device = riscv_iommu_probe_device, > > +}; > > + > > static int riscv_iommu_init_check(struct riscv_iommu_device *iommu) > > { > > u64 ddtp; > > @@ -71,6 +126,7 @@ static int riscv_iommu_init_check(struct riscv_iommu_device *iommu) > > > > void riscv_iommu_remove(struct riscv_iommu_device *iommu) > > { > > + iommu_device_unregister(&iommu->iommu); > > iommu_device_sysfs_remove(&iommu->iommu); > > } > > > > @@ -95,5 +151,15 @@ int riscv_iommu_init(struct riscv_iommu_device *iommu) > > return dev_err_probe(iommu->dev, rc, > > "cannot register sysfs interface\n"); > > > > + rc = 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; > > } > > -- > > 2.34.1 > > > > Best, - Tomasz > > _______________________________________________ > > linux-riscv mailing list > > linux-riscv@lists.infradead.org > > http://lists.infradead.org/mailman/listinfo/linux-riscv
diff --git a/drivers/iommu/riscv/iommu.c b/drivers/iommu/riscv/iommu.c index 3c5a6b49669d..1f889daffb0e 100644 --- a/drivers/iommu/riscv/iommu.c +++ b/drivers/iommu/riscv/iommu.c @@ -17,6 +17,7 @@ #include <linux/init.h> #include <linux/iommu.h> #include <linux/kernel.h> +#include <linux/pci.h> #include "iommu-bits.h" #include "iommu.h" @@ -36,6 +37,60 @@ static void riscv_iommu_disable(struct riscv_iommu_device *iommu) riscv_iommu_writel(iommu, RISCV_IOMMU_REG_PQCSR, 0); } +static int riscv_iommu_attach_identity_domain(struct iommu_domain *iommu_domain, + struct device *dev) +{ + /* Global pass-through already enabled, do nothing for now. */ + return 0; +} + +static struct iommu_domain riscv_iommu_identity_domain = { + .type = IOMMU_DOMAIN_IDENTITY, + .ops = &(const struct iommu_domain_ops) { + .attach_dev = 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_phandle_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 = dev_iommu_fwspec_get(dev); + struct riscv_iommu_device *iommu; + + if (!fwspec->iommu_fwnode->dev || !fwspec->num_ids) + return ERR_PTR(-ENODEV); + + iommu = dev_get_drvdata(fwspec->iommu_fwnode->dev); + if (!iommu) + return ERR_PTR(-ENODEV); + + return &iommu->iommu; +} + +static const struct iommu_ops riscv_iommu_ops = { + .of_xlate = riscv_iommu_of_xlate, + .identity_domain = &riscv_iommu_identity_domain, + .def_domain_type = riscv_iommu_device_domain_type, + .device_group = riscv_iommu_device_group, + .probe_device = riscv_iommu_probe_device, +}; + static int riscv_iommu_init_check(struct riscv_iommu_device *iommu) { u64 ddtp; @@ -71,6 +126,7 @@ static int riscv_iommu_init_check(struct riscv_iommu_device *iommu) void riscv_iommu_remove(struct riscv_iommu_device *iommu) { + iommu_device_unregister(&iommu->iommu); iommu_device_sysfs_remove(&iommu->iommu); } @@ -95,5 +151,15 @@ int riscv_iommu_init(struct riscv_iommu_device *iommu) return dev_err_probe(iommu->dev, rc, "cannot register sysfs interface\n"); + rc = 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; }