powerpc: Call dma_debug_add_bus for PCI and VIO buses

The DMA API debug code has hooks to verify all DMA entries have been
freed at time of hot unplug. We need to call dma_debug_add_bus for
this to work.
Signed-off-by: NAnton Blanchard <anton@samba.org>
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>

arch/powerpc/include/asm/vio.h

@@ -44,6 +44,8 @@
  */
 #define VIO_CMO_MIN_ENT 1562624
 
+extern struct bus_type vio_bus_type;
+
 struct iommu_table;
 
 /*

arch/powerpc/kernel/dma.c

@@ -11,6 +11,8 @@
 #include <linux/gfp.h>
 #include <linux/memblock.h>
 #include <linux/export.h>
+#include <linux/pci.h>
+#include <asm/vio.h>
 #include <asm/bug.h>
 #include <asm/abs_addr.h>
 #include <asm/machdep.h>
@@ -205,7 +207,13 @@ EXPORT_SYMBOL_GPL(dma_get_required_mask);
 
 static int __init dma_init(void)
 {
-       dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES);
+	dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES);
+#ifdef CONFIG_PCI
+	dma_debug_add_bus(&pci_bus_type);
+#endif
+#ifdef CONFIG_IBMVIO
+	dma_debug_add_bus(&vio_bus_type);
+#endif
 
        return 0;
 }

arch/powerpc/kernel/vio.c

@@ -37,8 +37,6 @@
 #include <asm/page.h>
 #include <asm/hvcall.h>
 
-static struct bus_type vio_bus_type;
-
 static struct vio_dev vio_bus_device  = { /* fake "parent" device */
 	.name = "vio",
 	.type = "",
@@ -1580,7 +1578,7 @@ static int vio_hotplug(struct device *dev, struct kobj_uevent_env *env)
 	return 0;
 }
 
-static struct bus_type vio_bus_type = {
+struct bus_type vio_bus_type = {
 	.name = "vio",
 	.dev_attrs = vio_dev_attrs,
 	.uevent = vio_hotplug,