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authorFlorian Fainelli2021-03-18 21:03:33 -0700
committerKonrad Rzeszutek Wilk2021-03-19 05:00:18 +0000
commitfcf044891c84e38fc90eb736b818781bccf94e38 (patch)
tree4f6af8d4dab1566a3e9b3a64d563e2aad61ef836 /arch/arm/mm
parent2cbc2776efe4faed0e17c48ae076aa03a0fcc61f (diff)
ARM: Qualify enabling of swiotlb_init()
We do not need a SWIOTLB unless we have DRAM that is addressable beyond the arm_dma_limit. Compare max_pfn with arm_dma_pfn_limit to determine whether we do need a SWIOTLB to be initialized. Fixes: ad3c7b18c5b3 ("arm: use swiotlb for bounce buffering on LPAE configs") Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'arch/arm/mm')
-rw-r--r--arch/arm/mm/init.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
index 828a2561b229..8356bf1daa28 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);