Re: [Xen-devel] [PATCH v15] This is the ABI for the two halves of a para-virtualized sound driver to communicate with each to other.

[Oleksandr Andrushchenko <andr2000@xxxxxxxxx>]

On 01/26/2017 01:09 PM, Dario Faggioli wrote:
> On Thu, 2017-01-26 at 12:02 +0200, Oleksandr Andrushchenko wrote:
> > Hi, Konrad!
> >
> > First of all thank you very much for the valuable comments
> >
> > and your time!
> >
> > The number of changes (mostly in description) is going to
> >
> > be huge, so do you think I can publish something like
> >
> > "RFC v16" so we can discuss the updated patch?
> Konrad's call, but why you want to introduce the 'RFC' tag now? I'd
> just go with v16...
no particular reason, will use v16 )
> > On 01/24/2017 09:13 PM, Konrad Rzeszutek Wilk wrote:
> > > On Mon, Dec 05, 2016 at 03:05:29PM +0200, Oleksandr Andrushchenko
> > > wrote:
> > > >   
> > > > + * Example for the frontend running in domain 5, instance of the
> > > > driver
> > > > + * in the front is 0 (single or first PV driver), device id 2,
> > > > + * first stream (0):
> > > > + * /local/domain/<frontend_id>/device/vsnd/<drv_idx>/
> > > > + *         device/<dev_id>/stream/<stream_idx>/type = "p"
> > > > + * /local/domain/5/device/vsnd/0/device/2/stream/0/type = "p"
> > > Why do you need 'device' ?
> > just for clarity: the hierarchy of the sound driver would
> > be that a device may have multiple different streams.
> > So, from readability POV I would still have "device" in place
> >   From xenstore documentation: "Data should generally be
> > human-readable for ease of management and debugging "
> > I assume this also applies to the structure as well
> Perhaps:
>
>   
> /local/domain/<frontend_id>/device/vsnd/<drv_idx>/dev-<dev_id>/stream-<stream_idx>/...
>
> > > Could not this be:
> > >
> > > /local/domain/5/device/vsnd/0/2/stream/0/type = "p" ?
> > then one has to know that "2" stands for device.
> > see above, I would keep "device" here
>   /local/domain/5/device/vsnd/0/dev-2/stream-0/type = "p"
>
> Or, with no '-':
>
>   /local/domain/5/device/vsnd/0/dev2/stream0/type = "p"
>
> Just my 2 cents...
1. Well, the only reason I have "device" here is for clarity
and consistency: sound card owns PCM devices, PCM device owns
streams
We could probably have "pcm-dev" instead of "device" here,
so we do not collide with xen device.
2. "dev-%d" or "dev%d", "stream-%d" or "stream%d"
IMO, we already have indices employed in xenstore,
e.g. "domain/5", not "domain-5" or "domain5"
So, is the PCM device in question any different from domain
from this POV? To me - not, so this is why I use "device/%d"
> Dario
Thank you,
Oleksandr

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