On Sun, 2003-05-18 at 04:29, Arjan van de Ven wrote:
> An interface like
>
> #define PCI_DMA_64BIT 0xffffffffffffffffULL
> #define PCI_DMA_32BIT 0xffffffffULL
This we can add now.
> void pci_set_dma_capabilities(device,
> u64 streaming_mask, u64 persistent_mask);
> u64 pci_get_effective_streaming_mask(device);
> u64 pci_get_effective_persistent_mask(device);
>
I see the value in this for weird mask devices, but I don't think it's a
"must fix" for 2.6 since the weird mask devices can advertise a lower
standard supported mask.
The aic driver, for instance, seems to have a 39 bit addressing range
(it uses 32 bit addr and 32 bit len descriptors, but reduces len to 24
bits to steal the extra byte for 7 bits extra addressing). However, it
is forced to request the full 64 bit address mask---I've never worked
out what will happen to it on a machine with more than 512GB memory.
The lack of a coherent_mask is causing breakage on some platforms, so
putting it in is a 2.6 must fix thing.
James
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This archive was generated by hypermail 2b29 : Fri May 23 2003 - 22:00:29 EST