| Subject | Re: [RFC PATCH v3 4/6] swiotlb: Add restricted DMA alloc/free support. | From | Florian Fainelli <> | Date | Tue, 12 Jan 2021 15:41:46 -0800 |
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On 1/5/21 7:41 PM, Claire Chang wrote: > Add the functions, swiotlb_alloc and swiotlb_free to support the > memory allocation from restricted DMA pool. > > Signed-off-by: Claire Chang <tientzu@chromium.org> > ---
[snip]
> diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c > index 30ccbc08e229..126e9b3354d6 100644 > --- a/kernel/dma/direct.c > +++ b/kernel/dma/direct.c > @@ -137,6 +137,11 @@ void *dma_direct_alloc(struct device *dev, size_t size, > void *ret; > int err; > > +#ifdef CONFIG_SWIOTLB > + if (unlikely(dev->dma_io_tlb_mem)) > + return swiotlb_alloc(dev, size, dma_handle, attrs); > +#endif
While this is potentially a hot path, I am not sure of the unkikely is warranted, maybe best left as a plain conditional. -- Florian
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