swiotlb: Remove external access to io_tlb_start

Add a new function, get_swiotlb_start(), and remove external access to
io_tlb_start, so we can entirely hide struct swiotlb inside of swiotlb.c
in the following patches.

Signed-off-by: Claire Chang <tientzu@chromium.org>

arch/powerpc/platforms/pseries/svm.c

@@ -55,8 +55,8 @@ void __init svm_swiotlb_init(void)
 	if (vstart && !swiotlb_init_with_tbl(vstart, io_tlb_nslabs, false))
 		return;
 
-	if (io_tlb_start)
-		memblock_free_early(io_tlb_start,
+	if (vstart)
+		memblock_free_early(vstart,
 				    PAGE_ALIGN(io_tlb_nslabs << IO_TLB_SHIFT));
 	panic("SVM: Cannot allocate SWIOTLB buffer");
 }

drivers/xen/swiotlb-xen.c

@@ -192,8 +192,8 @@ int __ref xen_swiotlb_init(int verbose, bool early)
 	/*
 	 * IO TLB memory already allocated. Just use it.
 	 */
-	if (io_tlb_start != 0) {
-		xen_io_tlb_start = phys_to_virt(io_tlb_start);
+	if (is_swiotlb_active()) {
+		xen_io_tlb_start = phys_to_virt(get_swiotlb_start());
 		goto end;
 	}
 

include/linux/swiotlb.h

@@ -81,6 +81,7 @@ void __init swiotlb_exit(void);
 unsigned int swiotlb_max_segment(void);
 size_t swiotlb_max_mapping_size(struct device *dev);
 bool is_swiotlb_active(void);
+phys_addr_t get_swiotlb_start(void);
 void __init swiotlb_adjust_size(unsigned long new_size);
 #else
 #define swiotlb_force SWIOTLB_NO_FORCE

kernel/dma/swiotlb.c

@@ -719,6 +719,11 @@ bool is_swiotlb_active(void)
 	return io_tlb_end != 0;
 }
 
+phys_addr_t get_swiotlb_start(void)
+{
+	return io_tlb_start;
+}
+
 #ifdef CONFIG_DEBUG_FS
 
 static int __init swiotlb_create_debugfs(void)