Hi, On 11/5/18 8:34 AM, Lu Baolu wrote: > Add the response to IOMMU_DEV_ATTR_AUXD_CAPABILITY capability query > through iommu_get_dev_attr().
commit title: Advertise auxiliary domain capability? > > Cc: Ashok Raj <[email protected]> > Cc: Jacob Pan <[email protected]> > Cc: Kevin Tian <[email protected]> > Signed-off-by: Lu Baolu <[email protected]> > Signed-off-by: Liu Yi L <[email protected]> > --- > drivers/iommu/intel-iommu.c | 38 +++++++++++++++++++++++++++++++++++++ > 1 file changed, 38 insertions(+) > > diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c > index 5e149d26ea9b..298f7a3fafe8 100644 > --- a/drivers/iommu/intel-iommu.c > +++ b/drivers/iommu/intel-iommu.c > @@ -5167,6 +5167,24 @@ static phys_addr_t intel_iommu_iova_to_phys(struct > iommu_domain *domain, > return phys; > } > > +static inline bool scalable_mode_support(void) > +{ > + struct dmar_drhd_unit *drhd; > + struct intel_iommu *iommu; > + bool ret = true; > + > + rcu_read_lock(); > + for_each_active_iommu(iommu, drhd) { > + if (!sm_supported(iommu)) { > + ret = false; > + break; > + } > + } > + rcu_read_unlock(); > + > + return ret; > +} > + > static bool intel_iommu_capable(enum iommu_cap cap) > { > if (cap == IOMMU_CAP_CACHE_COHERENCY) > @@ -5331,6 +5349,25 @@ struct intel_iommu *intel_svm_device_to_iommu(struct > device *dev) > } > #endif /* CONFIG_INTEL_IOMMU_SVM */ > > +static int intel_iommu_get_dev_attr(struct device *dev, > + enum iommu_dev_attr attr, void *data) > +{ > + int ret = 0; > + bool *auxd_capable; nit: could be local to the case as other cases may use other datatypes. > + > + switch (attr) { > + case IOMMU_DEV_ATTR_AUXD_CAPABILITY: > + auxd_capable = data; > + *auxd_capable = scalable_mode_support(); > + break; > + default: > + ret = -EINVAL; > + break; > + } > + > + return ret; > +} > + > const struct iommu_ops intel_iommu_ops = { > .capable = intel_iommu_capable, > .domain_alloc = intel_iommu_domain_alloc, > @@ -5345,6 +5382,7 @@ const struct iommu_ops intel_iommu_ops = { > .get_resv_regions = intel_iommu_get_resv_regions, > .put_resv_regions = intel_iommu_put_resv_regions, > .device_group = pci_device_group, > + .get_dev_attr = intel_iommu_get_dev_attr, > .pgsize_bitmap = INTEL_IOMMU_PGSIZES, > }; > > Thanks Eric _______________________________________________ iommu mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/iommu
