Merge branch 'stable/for-linus-5.13' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/swiotlb

Pull swiotlb updates from Konrad Rzeszutek Wilk:
 "Christoph Hellwig has taken a cleaver and trimmed off the not-needed
  code and nicely folded duplicate code in the generic framework.

  This lays the groundwork for more work to add extra DMA-backend-ish in
  the future. Along with that some bug-fixes to make this a nice working
  package"

* 'stable/for-linus-5.13' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/swiotlb:
  swiotlb: don't override user specified size in swiotlb_adjust_size
  swiotlb: Fix the type of index
  swiotlb: Make SWIOTLB_NO_FORCE perform no allocation
  ARM: Qualify enabling of swiotlb_init()
  swiotlb: remove swiotlb_nr_tbl
  swiotlb: dynamically allocate io_tlb_default_mem
  swiotlb: move global variables into a new io_tlb_mem structure
  xen-swiotlb: remove the unused size argument from xen_swiotlb_fixup
  xen-swiotlb: split xen_swiotlb_init
  swiotlb: lift the double initialization protection from xen-swiotlb
  xen-swiotlb: remove xen_io_tlb_start and xen_io_tlb_nslabs
  xen-swiotlb: remove xen_set_nslabs
  xen-swiotlb: use io_tlb_end in xen_swiotlb_dma_supported
  xen-swiotlb: use is_swiotlb_buffer in is_xen_swiotlb_buffer
  swiotlb: split swiotlb_tbl_sync_single
  swiotlb: move orig addr and size validation into swiotlb_bounce
  swiotlb: remove the alloc_size parameter to swiotlb_tbl_unmap_single
  powerpc/svm: stop using io_tlb_start

1 files changed, 5 insertions, 1 deletions

diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
index 7022b7b5c400..1ba9f9f9dbd8 100644
--- a/arch/arm/mm/init.c
+++ b/arch/arm/mm/init.c
@@ -301,7 +301,11 @@ static void __init free_highpages(void)
 void __init mem_init(void)
 {
 #ifdef CONFIG_ARM_LPAE
-	swiotlb_init(1);
+	if (swiotlb_force == SWIOTLB_FORCE ||
+	    max_pfn > arm_dma_pfn_limit)
+		swiotlb_init(1);
+	else
+		swiotlb_force = SWIOTLB_NO_FORCE;
 #endif
 
 	set_max_mapnr(pfn_to_page(max_pfn) - mem_map);