On 21/04/2019 02:17, Lu Baolu wrote:
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...@linux.intel.com>
---
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);
Nit: this would probably be more efficient on most architectures as:
if (domain)
return domain->pgsize_bitmap & -domain->pgsize_bitmap;
I'd also suggest s/minimal/min/ in the name, just to stop it getting too
long. Otherwise, though, I like the idea, and there's at least one other
place (in iommu-dma) that can make use of it straight away.
Robin.
+
+ 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
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