1 files changed, 9 insertions, 5 deletions

diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index 71145f952070..ae85da6307bb 100644
--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c
@@ -33,6 +33,7 @@
 #include <linux/dma-mapping.h>
 #include <linux/dma-contiguous.h>
 #include <linux/efi.h>
+#include <linux/swiotlb.h>
 
 #include <asm/fixmap.h>
 #include <asm/memory.h>
@@ -45,6 +46,7 @@
 #include "mm.h"
 
 phys_addr_t memstart_addr __read_mostly = 0;
+phys_addr_t arm64_dma_phys_limit __read_mostly;
 
 #ifdef CONFIG_BLK_DEV_INITRD
 static int __init early_initrd(char *p)
@@ -85,7 +87,7 @@ static void __init zone_sizes_init(unsigned long min, unsigned long max)
 
         /* 4GB maximum for 32-bit only capable devices */
         if (IS_ENABLED(CONFIG_ZONE_DMA)) {
-                max_dma = PFN_DOWN(max_zone_dma_phys());
+                max_dma = PFN_DOWN(arm64_dma_phys_limit);
                 zone_size[ZONE_DMA] = max_dma - min;
         }
         zone_size[ZONE_NORMAL] = max - max_dma;
@@ -156,8 +158,6 @@ early_param("mem", early_mem);
 
 void __init arm64_memblock_init(void)
 {
-        phys_addr_t dma_phys_limit = 0;
-
         memblock_enforce_memory_limit(memory_limit);
 
         /*
@@ -174,8 +174,10 @@ void __init arm64_memblock_init(void)
 
         /* 4GB maximum for 32-bit only capable devices */
         if (IS_ENABLED(CONFIG_ZONE_DMA))
-                dma_phys_limit = max_zone_dma_phys();
-        dma_contiguous_reserve(dma_phys_limit);
+                arm64_dma_phys_limit = max_zone_dma_phys();
+        else
+                arm64_dma_phys_limit = PHYS_MASK + 1;
+        dma_contiguous_reserve(arm64_dma_phys_limit);
 
         memblock_allow_resize();
         memblock_dump_all();
@@ -276,6 +278,8 @@ static void __init free_unused_memmap(void)
  */
 void __init mem_init(void)
 {
+        swiotlb_init(1);
+
         set_max_mapnr(pfn_to_page(max_pfn) - mem_map);
 
 #ifndef CONFIG_SPARSEMEM_VMEMMAP