Re: [Xen-ia64-devel] where's phys_to_machine?

[Tristan Gingold <tgingold@xxxxxxx>]

On Thu, Feb 15, 2007 at 11:15:21AM +0900, Isaku Yamahata wrote:
[...]
> Probably the ia64 counter part is phys_to_machine_for_dma().
> It convers pseudo physical address to machine address.
> In general, device drivers shouldn't call phys_to_machine() directly.
> For dma, device drivers should use dma api.
> For IO area access, device drivers should use ioremap()/iounmap().
> 
> This is only the theory and presumably you already know it.
> The device which you are playing with might have strange aspects,
> I guess.
IIRC the Quadrics cards are designed to be programmed directly by the user.
They therefore have an MMU, which has to be updated.  Not a really simple
driver !

Tristan.

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