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arm64: mm: fix DMA zone when dma-ranges is missing

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Some platforms, like Rockchip RK3568 based Odroid M1, do not provide DMA
limits information in device-tree dma-ranges property. Still some device
drivers set DMA limit that relies on DMA zone at low 4GB memory area.
Until commit ba0fb44aed ("dma-mapping: replace zone_dma_bits by
zone_dma_limit"), zone_sizes_init() restricted DMA zone to low 32-bit.

Restore DMA zone 32-bit limit when the platform provides no DMA bus
limit information.

Fixes: ba0fb44aed ("dma-mapping: replace zone_dma_bits by zone_dma_limit")
Reported-by: Marek Szyprowski <m.szyprowski@samsung.com>
Link: https://lore.kernel.org/r/53d988b1-bdce-422a-ae4e-158f305ad703@samsung.com
Suggested-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Baruch Siach 2024-08-28 12:51:24 +03:00 committed by Christoph Hellwig
parent b5c58b2fdc
commit 833bd284a4
1 changed files with 3 additions and 0 deletions
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3
arch/arm64/mm/init.c
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@ -116,6 +116,9 @@ static void __init arch_reserve_crashkernel(void)
static phys_addr_t __init max_zone_phys(phys_addr_t zone_limit)
{
if (zone_limit == PHYS_ADDR_MAX)
zone_limit = U32_MAX;
return min(zone_limit, memblock_end_of_DRAM() - 1) + 1;
}