David Brownell wrote:
>
> For OHCI another way to solve the done_list bus_to_virt isssue:
>
> struct td {
> ...
> struct td *dma_hash; /* grows size 64 -> 68/72 */
> dma_addr_t dma_addr; /* ... 72 */
> };
>
> #define TD_HASH_SIZE 53 /* prime */
> struct ohci {
> ...
> struct td *dma_hash [TD_HASH_SIZE];
> };
>
> static inline td *dma_to_td (struct ohci *ohci, u32 dma)
> {
> struct td *td;
> td = ohci->dma_hash[(dma>>SOME_SHIFT)%TD_HASH_SIZE];
> while (td && td->dma_addr != dma) td = td->dma_hash;
> return td;
> }
>
> Hashes maintained in td_alloc and td_free. Seems familiar.
> Brad, Steve -- that kind of thing? It'd be great to see a patch
> along these lines. I think Roman's right: most systems won't
> have many tds active at a time. Usually one td per urb.
>
Ok, thats a good starting point, but I also like Alans idea
to hash just the page addresses.
- Roman
> - Dave
>
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