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SubjectRe: [PATCH v2 0/5] ALSA: xen-front: Add Xen para-virtualized frontend driver
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Hello, Juergen!

Thank you very much for reviewing the driver and providing
valuable comments! I will send v3 of the driver once I have
more reviews, especially I hope ALSA community can also take a look

Also, as you suggested on IRC, I will add a patch for adding
myself as sound/xen maintainer.

Thank you,
Oleksandr

On 04/16/2018 09:24 AM, Oleksandr Andrushchenko wrote:
> From: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
>
> Please note: this patch series depends on [3].
>
> This patch series adds support for Xen [1] para-virtualized
> sound frontend driver. It implements the protocol from
> include/xen/interface/io/sndif.h with the following limitations:
> - mute/unmute is not supported
> - get/set volume is not supported
> Volume control is not supported for the reason that most of the
> use-cases (at the moment) are based on scenarious where
> unprivileged OS (e.g. Android, AGL etc) use software mixers.
>
> Both capture and playback are supported.
>
> Corresponding backend, implemented as a user-space application, can be
> found at [2].
>
> Thank you,
> Oleksandr
>
> Changes since v1:
> *****************
>
> 1. Moved driver from sound/drivers to sound/xen
>
> 2. Coding style changes to better meet Linux Kernel
>
> 3. Added 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
>
> 4. Added 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.
>
> [1] https://xenproject.org/
> [2] https://github.com/xen-troops/snd_be
> [3] https://lkml.org/lkml/2018/4/12/522
>
> Oleksandr Andrushchenko (5):
> ALSA: xen-front: Introduce Xen para-virtualized sound frontend driver
> ALSA: xen-front: Read sound driver configuration from Xen store
> ALSA: xen-front: Implement Xen event channel handling
> ALSA: xen-front: Implement handling of shared buffers
> ALSA: xen-front: Implement ALSA virtual sound driver
>
> sound/Kconfig | 2 +
> sound/Makefile | 2 +-
> sound/xen/Kconfig | 10 +
> sound/xen/Makefile | 9 +
> sound/xen/xen_snd_front.c | 410 +++++++++++++++++++
> sound/xen/xen_snd_front.h | 57 +++
> sound/xen/xen_snd_front_alsa.c | 830 ++++++++++++++++++++++++++++++++++++++
> sound/xen/xen_snd_front_alsa.h | 23 ++
> sound/xen/xen_snd_front_cfg.c | 517 ++++++++++++++++++++++++
> sound/xen/xen_snd_front_cfg.h | 46 +++
> sound/xen/xen_snd_front_evtchnl.c | 478 ++++++++++++++++++++++
> sound/xen/xen_snd_front_evtchnl.h | 92 +++++
> sound/xen/xen_snd_front_shbuf.c | 193 +++++++++
> sound/xen/xen_snd_front_shbuf.h | 36 ++
> 14 files changed, 2704 insertions(+), 1 deletion(-)
> create mode 100644 sound/xen/Kconfig
> create mode 100644 sound/xen/Makefile
> create mode 100644 sound/xen/xen_snd_front.c
> create mode 100644 sound/xen/xen_snd_front.h
> create mode 100644 sound/xen/xen_snd_front_alsa.c
> create mode 100644 sound/xen/xen_snd_front_alsa.h
> create mode 100644 sound/xen/xen_snd_front_cfg.c
> create mode 100644 sound/xen/xen_snd_front_cfg.h
> create mode 100644 sound/xen/xen_snd_front_evtchnl.c
> create mode 100644 sound/xen/xen_snd_front_evtchnl.h
> create mode 100644 sound/xen/xen_snd_front_shbuf.c
> create mode 100644 sound/xen/xen_snd_front_shbuf.h
>

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