Re: [PATCHv3 08/16] staging: vme_user: provide DMA functionality

[Dmitry Kalinkin]

> On 07 Jul 2015, at 15:51, Alessio Igor Bogani <alessioigorbogani@xxxxxxxxx> wrote:
> 
<snip>
>> Current VME stack links windows not to the boards, but to device drivers.
>> Driver
>> could potentially minimise window usage within itâs scope (any sort of
>> window
>> reusing, like mapping whole A16 once to be used with all boards), but this
>> wonât
>> work across multiple drivers. Even if all of your drivers are window-wise
>> economic,
>> they will still need some amount of windows per each driver. Not that we
>> have that
>> many kernel drivers...
> 
> Yes you can share a window/image between all boards of the same type
> (in effect we are porting our drivers in this way) *but* it isn't the
> expected way to work (see Documentation/vme_api.txt struct
> vme_driver's probe() and match() functions and the GE PIO2 VME
> driver).
And vme_pio2 canât handle more than 8 boards. This shows that the current
design needs some adjustments. Also would be great if probe() and match()
allowed for void *private data field.

Cheers,
Dmitry--
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