diff -ru usr/src/nv/nv-linux.h usr/src/nv.1175225/nv-linux.h
--- usr/src/nv/nv-linux.h	2004-11-03 22:53:00.000000000 +0100
+++ usr/src/nv.1175225/nv-linux.h	2004-12-21 21:03:33.000000000 +0100
@@ -533,6 +533,7 @@
  */
 #if defined(CONFIG_SWIOTLB)
 #define NV_SWIOTLB 1
+#define NV_SWIOTLB_MAX_RETRIES 16
 extern int nv_swiotlb;
 #endif
 
@@ -950,10 +951,48 @@
     sg_ptr->offset = (unsigned long)base & ~PAGE_MASK;
     sg_ptr->length  = num_pages * PAGE_SIZE;
 
+#if defined(NV_SWIOTLB)
+    i = NV_SWIOTLB_MAX_RETRIES;
+    do {
+        if (pci_map_sg(dev, sg_ptr, 1, PCI_DMA_BIDIRECTIONAL) == 0)
+            return 1;
+
+        if (sg_ptr->dma_address & ~PAGE_MASK)
+        {
+            struct scatterlist sg_tmp;
+            pci_unmap_sg(dev, sg_ptr, num_pages, PCI_DMA_BIDIRECTIONAL);
+
+            memset(&sg_tmp, 0, sizeof(struct scatterlist));
+            sg_tmp.page = sg_ptr->page;
+            sg_tmp.offset = sg_ptr->offset;
+            sg_tmp.length = 2048;
+
+            if (pci_map_sg(dev, &sg_tmp, 1, PCI_DMA_BIDIRECTIONAL) == 0)
+                return 1;
+
+            if (pci_map_sg(dev, sg_ptr, 1, PCI_DMA_BIDIRECTIONAL) == 0)
+            {
+                pci_unmap_sg(dev, &sg_tmp, num_pages, PCI_DMA_BIDIRECTIONAL);
+                return 1;
+            }
+
+            pci_unmap_sg(dev, &sg_tmp, num_pages, PCI_DMA_BIDIRECTIONAL);
+        }
+    } while (i-- && sg_ptr->dma_address & ~PAGE_MASK);
+#else
     if (pci_map_sg(dev, sg_ptr, 1, PCI_DMA_BIDIRECTIONAL) == 0)
     {
         return 1;
     }
+#endif
+
+    if (sg_ptr->dma_address & ~PAGE_MASK)
+    {
+        nv_printf(NV_DBG_ERRORS,
+            "NVRM: VM: nv_sg_map_buffer: failed to obtain aligned mapping\n");
+        pci_unmap_sg(dev, sg_ptr, num_pages, PCI_DMA_BIDIRECTIONAL);
+        return 1;
+    }
 
     NV_FIXUP_SWIOTLB_VIRT_ADDR_BUG(sg_ptr->dma_address);