[SPARC64]: Remove PGLIST_NENTS PCI IOMMU mapping limitation on SUN4V.

Use a batching queue system for IOMMU mapping setup,
with a page sized batch.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 8 insertions, 3 deletions

diff --git a/arch/sparc64/kernel/pci_sun4v_asm.S b/arch/sparc64/kernel/pci_sun4v_asm.S
index 424db6526648..6604fdbf746c 100644
--- a/arch/sparc64/kernel/pci_sun4v_asm.S
+++ b/arch/sparc64/kernel/pci_sun4v_asm.S
@@ -11,14 +11,19 @@
          * %o3: io_attributes
          * %o4: io_page_list phys address
          *
-         * returns %o0: num ttes mapped
+         * returns %o0: -status if status was non-zero, else
+         *         %o0: num pages mapped
          */
         .globl  pci_sun4v_iommu_map
 pci_sun4v_iommu_map:
+        mov     %o5, %g1
         mov     HV_FAST_PCI_IOMMU_MAP, %o5
         ta      HV_FAST_TRAP
-        retl
-         mov    %o1, %o0
+        brnz,pn %o0, 1f
+         sub    %g0, %o0, %o0
+        mov     %o1, %o0
+1:      retl
+         nop
 
         /* %o0: devhandle
          * %o1: tsbid