X-Git-Url: https://git.proxmox.com/?a=blobdiff_plain;f=arch%2Fpowerpc%2Fkernel%2Fiommu.c;h=685a4767b72238e7264d13fb3f5a8b1021efb467;hb=55c891852012bbc90899472a494d73d09ed9a2c5;hp=5f202a566ec5f0296a22a71ac238a63a6a90ba7f;hpb=03daa36f089f31002a2d0fb22088d3ebe3e28d98;p=mirror_ubuntu-zesty-kernel.git

diff --git a/arch/powerpc/kernel/iommu.c b/arch/powerpc/kernel/iommu.c
index 5f202a566ec5..685a4767b722 100644
--- a/arch/powerpc/kernel/iommu.c
+++ b/arch/powerpc/kernel/iommu.c
@@ -1004,6 +1004,31 @@ long iommu_tce_xchg(struct iommu_table *tbl, unsigned long entry,
 }
 EXPORT_SYMBOL_GPL(iommu_tce_xchg);
 
+#ifdef CONFIG_PPC_BOOK3S_64
+long iommu_tce_xchg_rm(struct iommu_table *tbl, unsigned long entry,
+		unsigned long *hpa, enum dma_data_direction *direction)
+{
+	long ret;
+
+	ret = tbl->it_ops->exchange_rm(tbl, entry, hpa, direction);
+
+	if (!ret && ((*direction == DMA_FROM_DEVICE) ||
+			(*direction == DMA_BIDIRECTIONAL))) {
+		struct page *pg = realmode_pfn_to_page(*hpa >> PAGE_SHIFT);
+
+		if (likely(pg)) {
+			SetPageDirty(pg);
+		} else {
+			tbl->it_ops->exchange_rm(tbl, entry, hpa, direction);
+			ret = -EFAULT;
+		}
+	}
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(iommu_tce_xchg_rm);
+#endif
+
 int iommu_take_ownership(struct iommu_table *tbl)
 {
 	unsigned long flags, i, sz = (tbl->it_size + 7) >> 3;