diff options
Diffstat (limited to 'drivers/iommu/iova.c')
| -rw-r--r-- | drivers/iommu/iova.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/iommu/iova.c b/drivers/iommu/iova.c index a3dbba8caa19..9dd8208312c2 100644 --- a/drivers/iommu/iova.c +++ b/drivers/iommu/iova.c @@ -55,12 +55,20 @@ void free_iova_mem(struct iova *iova) } 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; } |