Re: [RFC PATCH v5 0/3] vfio: platform: return device properties for a platform device

[Christoffer Dall <christoffer.dall@linaro.org>]

[why are you top-posting?]

On Mon, Oct 05, 2015 at 11:42:38AM +0200, Baptiste Reynal wrote:
> In this patch series we want to wrap an already available kernel
> interface to expose a device property to userspace, 

which 'already available kernel interface' is that exactly?

> in order to keep
> the code lighter on the userspace. We need those properties in VFIO as

I'm not sure I agree with your 'need those properties in VFIO' statement
here, can you elaborate?

> VFIO grants the possibility to develop userspace drivers.
> 
> The sysfs doesn't seems to be ready for this kind of usage. We can
> only find raw data that require heavy parsing. Here we retrieve
> directly usable data and it can be extended later according to new
> needs (as it is already done with ACPI).

Why couldn't you expose this kind of data through sysfs instead of VFIO
and independently of VFIO?  Would that be more wrong/difficult/whatever?

> 
> This interface has been developed for VFIO and is currently bound to
> it, though there is no special dependencies with it. We could make it
> more generic, but I can only think of VFIO to use it.

Thanks,
-Christoffer