Messages in this thread |  | | Subject | Re: [PATCH v2 0/5] ALSA: xen-front: Add Xen para-virtualized frontend driver | From | Oleksandr Andrushchenko <> | Date | Wed, 18 Apr 2018 18:15:46 +0300 |
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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]. The dependency is now merged into Xen kernel tree [4] for-linus-4.17 > > 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 > [4] https://git.kernel.org/pub/scm/linux/kernel/git/xen/tip.git/commit/?h=for-linus-4.17&id=cd6e992b3aab072cc90839508aaf5573c8f7e066
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