Introduce a helper function for drivers to use when updating an
iommu_iotlb_gather structure in response to an ->unmap() call, rather
than having to open-code the logic in every page-table implementation.
Signed-off-by: Will Deacon <w...@kernel.org>
---
include/linux/iommu.h | 31 +++++++++++++++++++++++++++++++
1 file changed, 31 insertions(+)
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 6cdd2e261ee3..95442de75a71 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -451,6 +451,31 @@ static inline void iommu_tlb_sync(struct iommu_domain
*domain,
iommu_iotlb_gather_init(iotlb_gather);
}
+static inline void iommu_iotlb_gather_add_page(struct iommu_domain *domain,
+ struct iommu_iotlb_gather
*gather,
+ unsigned long iova, size_t size)
+{
+ unsigned long start = iova, end = start + size;
+
+ /*
+ * If the new page is disjoint from the current range or is mapped at
+ * a different granularity, then sync the TLB so that the gather
+ * structure can be rewritten.
+ */
+ if (gather->pgsize != size ||
+ end < gather->start || start > gather->end) {
+ if (gather->pgsize)
+ iommu_tlb_sync(domain, gather);
+ gather->pgsize = size;
+ }
+
+ if (gather->end < end)
+ gather->end = end;
+
+ if (gather->start > start)
+ gather->start = start;
+}
+
/* PCI device grouping function */
extern struct iommu_group *pci_device_group(struct device *dev);
/* Generic device grouping function */
@@ -760,6 +785,12 @@ static inline void iommu_iotlb_gather_init(struct
iommu_iotlb_gather *gather)
{
}
+static inline void iommu_iotlb_gather_add_page(struct iommu_domain *domain,
+ struct iommu_iotlb_gather
*gather,
+ unsigned long iova, size_t size)
+{
+}
+
static inline void iommu_device_unregister(struct iommu_device *iommu)
{
}
--
2.11.0
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