}
void
-init_iova_domain(struct iova_domain *iovad, unsigned long start_pfn,
- unsigned long pfn_32bit)
+init_iova_domain(struct iova_domain *iovad, unsigned long granule,
+ unsigned long start_pfn, unsigned long pfn_32bit)
{
+ /*
+ * IOVA granularity will normally be equal to the smallest
+ * supported IOMMU page size; both *must* be capable of
+ * representing individual CPU pages exactly.
+ */
+ BUG_ON((granule > PAGE_SIZE) || !is_power_of_2(granule));
+
spin_lock_init(&iovad->iova_rbtree_lock);
iovad->rbroot = RB_ROOT;
iovad->cached32_node = NULL;
+ iovad->granule = granule;
iovad->start_pfn = start_pfn;
iovad->dma_32bit_pfn = pfn_32bit;
}