sparc64: Enable sun4v dma ops to use IOMMU v2 APIs

Add Hypervisor IOMMU v2 APIs pci_iotsb_map(), pci_iotsb_demap() and
enable sun4v dma ops to use IOMMU v2 API for all PCIe devices with
64bit DMA mask.

Signed-off-by: Tushar Dave <tushar.n.dave@oracle.com>
Reviewed-by: chris hyser <chris.hyser@oracle.com>
Acked-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Author: tndave

arch/sparc/include/asm/hypervisor.h

@@ -2377,6 +2377,12 @@ unsigned long sun4v_vintr_set_target(unsigned long dev_handle,
  *	iotsb_index	Zero-based IOTTE number within an IOTSB.
  */
 
+/* The index_count argument consists of two fields:
+ * bits 63:48 #iottes and bits 47:0 iotsb_index
+ */
+#define HV_PCI_IOTSB_INDEX_COUNT(__iottes, __iotsb_index) \
+	(((u64)(__iottes) << 48UL) | ((u64)(__iotsb_index)))
+
 /* pci_iotsb_conf()
  * TRAP:	HV_FAST_TRAP
  * FUNCTION:	HV_FAST_PCI_IOTSB_CONF