[PATCH v6 05/15] swiotlb: Add a new get_io_tlb_mem getter

[Claire Chang]

On Mon, May 10, 2021 at 11:03 PM Christoph Hellwig <hch at lst.de> wrote:
>
> > +static inline struct io_tlb_mem *get_io_tlb_mem(struct device *dev)
> > +{
> > +#ifdef CONFIG_DMA_RESTRICTED_POOL
> > +     if (dev && dev->dma_io_tlb_mem)
> > +             return dev->dma_io_tlb_mem;
> > +#endif /* CONFIG_DMA_RESTRICTED_POOL */
> > +
> > +     return io_tlb_default_mem;
>
> Given that we're also looking into a not addressing restricted pool
> I'd rather always assign the active pool to dev->dma_io_tlb_mem and
> do away with this helper.

Where do you think is the proper place to do the assignment? First
time calling swiotlb_map? or in of_dma_configure_id?