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    Subject[PATCH v2 10/11] arm64: edit zone_dma_bits to fine tune dma-direct min mask
    Date
    With the introduction of ZONE_DMA in arm64 devices are not forced to
    support 32 bit DMA masks. We have to inform dma-direct of this
    limitation whenever it happens.

    Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
    ---

    Changes in v2:
    - Make sure to filter the higher part of arm64_dma_phys_limit
    - Rename variable to zone_dma_bits

    arch/arm64/mm/init.c | 5 ++++-
    1 file changed, 4 insertions(+), 1 deletion(-)

    diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
    index c51ce79b692b..c5e619f21ad8 100644
    --- a/arch/arm64/mm/init.c
    +++ b/arch/arm64/mm/init.c
    @@ -22,6 +22,7 @@
    #include <linux/of_fdt.h>
    #include <linux/dma-mapping.h>
    #include <linux/dma-contiguous.h>
    +#include <linux/dma-direct.h>
    #include <linux/efi.h>
    #include <linux/swiotlb.h>
    #include <linux/vmalloc.h>
    @@ -437,8 +438,10 @@ void __init arm64_memblock_init(void)

    early_init_fdt_scan_reserved_mem();

    - if (IS_ENABLED(CONFIG_ZONE_DMA))
    + if (IS_ENABLED(CONFIG_ZONE_DMA)) {
    arm64_dma_phys_limit = max_zone_dma_phys();
    + zone_dma_bits = ilog2((arm64_dma_phys_limit - 1) & GENMASK_ULL(31, 0)) + 1;
    + }

    if (IS_ENABLED(CONFIG_ZONE_DMA32))
    arm64_dma32_phys_limit = max_zone_dma32_phys();
    --
    2.22.0
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