From ad3c7b18c5b362be5dbd0f2c0bcf1fd5fd659315 Mon Sep 17 00:00:00 2001
From: Christoph Hellwig
Date: Tue, 23 Jul 2019 11:33:12 +0200
Subject: arm: use swiotlb for bounce buffering on LPAE configs

The DMA API requires that 32-bit DMA masks are always supported, but on
arm LPAE configs they do not currently work when memory is present
above 4GB.  Wire up the swiotlb code like for all other architectures
to provide the bounce buffering in that case.

Fixes: 21e07dba9fb11 ("scsi: reduce use of block bounce buffers").
Reported-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Vignesh Raghavendra <vigneshr@ti.com>
---
 arch/arm/mm/init.c | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'arch/arm/mm/init.c')

diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
index 4920a206dce9..16d373d587c4 100644
--- a/arch/arm/mm/init.c
+++ b/arch/arm/mm/init.c
@@ -21,6 +21,7 @@
 #include <linux/dma-contiguous.h>
 #include <linux/sizes.h>
 #include <linux/stop_machine.h>
+#include <linux/swiotlb.h>
 
 #include <asm/cp15.h>
 #include <asm/mach-types.h>
@@ -463,6 +464,10 @@ static void __init free_highpages(void)
  */
 void __init mem_init(void)
 {
+#ifdef CONFIG_ARM_LPAE
+	swiotlb_init(1);
+#endif
+
 	set_max_mapnr(pfn_to_page(max_pfn) - mem_map);
 
 	/* this will put all unused low memory onto the freelists */
-- 
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