Re: [PATCH] swiotlb: fix dma_alloc_coherent allocation failures with swiotlb

[Andi Kleen]

Joerg Roedel <joerg.roedel@xxxxxxx> writes:

> The SWIOTLB version of dma_alloc_coherent allocates all memory with
> GFP_DMA unconditionally. This leads sometimes unnecessary to allocation
> failures. This patch makes the allocation strategy to use the DMA32 zone
> first if this is possible. The changes are boot tested on AMD64 and
> compile tested for i386 and IA64.

The high level dma_alloc_coherent() does that anyways.

The swiotlb fallback really should only allocate from the swiotlb,
nowhere else.

-Andi
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