Add the response to IOMMU_DEV_ATTR_AUXD_CAPABILITY capability query through iommu_get_dev_attr().
Cc: Ashok Raj <[email protected]> Cc: Jacob Pan <[email protected]> Cc: Kevin Tian <[email protected]> Cc: Liu Yi L <[email protected]> Signed-off-by: Lu Baolu <[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 4b1f7426acea..3133216e5733 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -5170,6 +5170,24 @@ 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) @@ -5334,6 +5352,25 @@ 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; + + 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, @@ -5348,6 +5385,7 @@ 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, }; -- 2.17.1 _______________________________________________ iommu mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/iommu
