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Diffstat (limited to 'drivers/iommu/iommu.c')
-rw-r--r--drivers/iommu/iommu.c20
1 files changed, 15 insertions, 5 deletions
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 02e4313..1bd6335 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -1143,14 +1143,24 @@ size_t default_iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
{
struct scatterlist *s;
size_t mapped = 0;
- unsigned int i;
+ unsigned int i, min_pagesz;
int ret;
- for_each_sg(sg, s, nents, i) {
- phys_addr_t phys = page_to_phys(sg_page(s));
+ if (unlikely(domain->ops->pgsize_bitmap == 0UL))
+ return 0;
- /* We are mapping on page boundarys, so offset must be 0 */
- if (s->offset)
+ min_pagesz = 1 << __ffs(domain->ops->pgsize_bitmap);
+
+ for_each_sg(sg, s, nents, i) {
+ phys_addr_t phys = page_to_phys(sg_page(s)) + s->offset;
+
+ /*
+ * We are mapping on IOMMU page boundaries, so offset within
+ * the page must be 0. However, the IOMMU may support pages
+ * smaller than PAGE_SIZE, so s->offset may still represent
+ * an offset of that boundary within the CPU page.
+ */
+ if (!IS_ALIGNED(s->offset, min_pagesz))
goto out_err;
ret = iommu_map(domain, iova + mapped, phys, s->length, prot);