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| author |   Florian Fainelli <f.fainelli@gmail.com> | 2021-03-18 21:03:33 -0700 |
|---|---|---|
| committer |   Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2021-03-19 05:00:18 +0000 |
| commit | fcf044891c84e38fc90eb736b818781bccf94e38 (patch) | |
| tree | 4f6af8d4dab1566a3e9b3a64d563e2aad61ef836 | |
| parent | swiotlb: remove swiotlb_nr_tbl (diff) | |
| download | linux-dev-fcf044891c84e38fc90eb736b818781bccf94e38.tar.xz linux-dev-fcf044891c84e38fc90eb736b818781bccf94e38.zip | |
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>
| -rw-r--r-- | arch/arm/mm/init.c | 6 |
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); |