[PATCH v3 01/10] iommu: Add helper to get minimal page size of domain

Lu Baolu
2019-04-21T01:17:10Z

This makes it possible for other modules to know the minimal
page size supported by a domain without the knowledge of the
structure details.

Signed-off-by: Lu Baolu <baolu.lu-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
---
include/linux/iommu.h | 13 +++++++++++++
1 file changed, 13 insertions(+)

diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index a5007d035218..46679ef19b7e 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -377,6 +377,14 @@ static inline void iommu_tlb_sync(struct iommu_domain *domain)
domain->ops->iotlb_sync(domain);
}

+static inline unsigned long domain_minimal_pgsize(struct iommu_domain *domain)
+{
+ if (domain && domain->pgsize_bitmap)
+ return 1 << __ffs(domain->pgsize_bitmap);
+
+ return 0;
+}
+
/* PCI device grouping function */
extern struct iommu_group *pci_device_group(struct device *dev);
/* Generic device grouping function */
@@ -704,6 +712,11 @@ const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode)
return NULL;
}

+static inline unsigned long domain_minimal_pgsize(struct iommu_domain *domain)
+{
+ return 0;
+}
+
#endif /* CONFIG_IOMMU_API */

#ifdef CONFIG_IOMMU_DEBUGFS
--
2.17.1