arm64: Call swiotlb_init() instead of swiotlb_init_with_default_size()

Following commit 74838b7 (swiotlb: add the late swiotlb initialization
function with iotlb memory) the swiotlb_init_with_default_size() is a
static function. This patch changes the arm64 code to call
swiotlb_init() instead and use the default size of 64MB. It is assumed
that AArch64 platforms have enough RAM to afford the pre-allocated
swiotlb memory. It also removes the #ifdef around this call since
CONFIG_SWIOTLB is always enabled.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

arch/arm64/mm/dma-mapping.c

@@ -61,12 +61,10 @@ static struct dma_map_ops arm64_swiotlb_dma_ops = {
 	.mapping_error = swiotlb_dma_mapping_error,
 };
 
-void __init swiotlb_init_with_default_size(size_t default_size, int verbose);
-
-void __init arm64_swiotlb_init(size_t max_size)
+void __init arm64_swiotlb_init(void)
 {
 	dma_ops = &arm64_swiotlb_dma_ops;
-	swiotlb_init_with_default_size(min((size_t)SZ_64M, max_size), 1);
+	swiotlb_init(1);
 }
 
 #define PREALLOC_DMA_DEBUG_ENTRIES	4096

arch/arm64/mm/init.c

@@ -301,10 +301,7 @@ void __init mem_init(void)
 	unsigned long reserved_pages, free_pages;
 	struct memblock_region *reg;
 
-#if CONFIG_SWIOTLB
-	extern void __init arm64_swiotlb_init(size_t max_size);
-	arm64_swiotlb_init(max_pfn << (PAGE_SHIFT - 1));
-#endif
+	arm64_swiotlb_init();
 
 	max_mapnr   = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
 

arch/arm64/mm/mm.h

@@ -1,2 +1,3 @@
 extern void __flush_dcache_page(struct page *page);
 extern void __init bootmem_init(void);
+extern void __init arm64_swiotlb_init(void);