[alsa-devel] [PATCH RESEND] xen/sndif: Sync up with the canonical definition in Xen

[Konrad Rzeszutek Wilk]

On Thu, Apr 12, 2018 at 01:46:33PM -0400, Boris Ostrovsky wrote:
> On 04/12/2018 01:26 PM, Oleksandr Andrushchenko wrote:
> > This is the sync up with the canonical definition of the sound
> > protocol in Xen:
> >
> > 1. Protocol version was referenced in the protocol description,
> >    but missed its definition. Fixed by adding a constant
> >    for current protocol version.
> >
> > 2. Some of the request descriptions have "reserved" fields
> >    missed: fixed by adding corresponding entries.
> >
> > 3. Extend the size of the requests and responses to 64 octets.
> >    Bump protocol version to 2.
> >
> > 4. Add explicit back and front synchronization
> >    In order to provide explicit synchronization between backend and
> >    frontend the following changes are introduced in the protocol:
> >     - add new ring buffer for sending asynchronous events from
> >       backend to frontend to report number of bytes played by the
> >       frontend (XENSND_EVT_CUR_POS)
> >     - introduce trigger events for playback control: start/stop/pause/resume
> >     - add "req-" prefix to event-channel and ring-ref to unify naming
> >       of the Xen event channels for requests and events
> >
> > 5. Add explicit back and front parameter negotiation
> >    In order to provide explicit stream parameter negotiation between
> >    backend and frontend the following changes are introduced in the protocol:
> >    add XENSND_OP_HW_PARAM_QUERY request to read/update
> >    configuration space for the parameters given: request passes
> >    desired parameter's intervals/masks and the response to this request
> >    returns allowed min/max intervals/masks to be used.
> >
> > Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko at epam.com>
> > Signed-off-by: Oleksandr Grytsov <oleksandr_grytsov at epam.com>
> > Cc: Konrad Rzeszutek Wilk <konrad.wilk at oracle.com>
> > Cc: Takashi Iwai <tiwai at suse.de>
> > ---
> 
> Reviewed-by: Boris Ostrovsky <boris.ostrovsky at oracle.com>
> 
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk at oracle.com>

Thank you!