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SubjectRe: dma_mask limited to 32-bits with OF platform device
On Wed, Feb 12, 2020 at 02:04:31PM +0000, Robin Murphy wrote:
>> For now, let's say that we limit dma-ranges to 4GB size. with "dma-ranges
>> = <0x00000000 0x00000000 0x1 0x00000000>;"
>> Then, dma_bus_limit is set correctly to 0xffffffff, SATA driver sets masks
>> to 64-bit as IP supports that.
>>
>> [   13.306847] ahci 4a140000.sata: dma_mask 0xffffffffffffffff,
>> coherent_mask 0xffffffffffffffff, dma_bus_limit 0xffffffff
>>
>> However, the SATA controller still tries to do DMA above 32-bits.
>> dma_alloc() doesn't seem to be taking dma_bus_limit into account?
>
> Yay ARM LPAE... Peter and Christoph have already been playing whack-a-mole
> with other bugs under that config - is this with or without SWIOTLB? (and
> whichever way, does the other work any better?)

Hmm. ARM LPAE still uses the arm legacy dma alloc coherent, and that
might not be taking the dma_bus_limit into account. Let me check..

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