From: Oleksandr Andrushchenko <Oleksandr_Andrushchenko@epam.com>
To: Takashi Sakamoto <o-takashi@sakamocchi.jp>,
tiwai@suse.com, alsa-devel@alsa-project.org,
linux-kernel@vger.kernel.org, xen-devel@lists.xen.org,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Oleksandr Andrushchenko <andr2000@gmail.com>,
Oleksandr Grytsov <al1img@gmail.com>,
Clemens Ladisch <clemens@ladisch.de>
Subject: Re: [RFC] ALSA: vsnd: Add Xen para-virtualized frontend driver
Date: Thu, 2 Nov 2017 11:55:14 +0200 [thread overview]
Message-ID: <80469e00-fa86-3ecd-6394-43e4aa88b41d@epam.com> (raw)
In-Reply-To: <b229c2d1-7628-d6dd-73f1-94a4a4106f52@sakamocchi.jp>
On 11/02/2017 11:44 AM, Takashi Sakamoto wrote:
> On Oct 30 2017 15:33, Oleksandr Andrushchenko wrote:
>> This is an attempt to summarize previous discussions on Xen para-virtual
>> sound driver.
>>
>> A first attempt has been made to upstream the driver [1] which
>> brought number
>> of fundamental questions, one of the biggest ones was that the
>> frontend driver
>> has no means to synchronize its period elapsed event with the host
>> driver,
>> but uses software emulation on the guest side [2] with a timer.
>> In order to address this a change to the existing Xen para-virtual sound
>> protocol [3] was proposed to fill this gap [4] and remove emulation:
>> 1. Introduced a new event channel from back to front
>> 2. New event with number of bytes played/captured (XENSND_EVT_CUR_POS,
>> to be used for sending snd_pcm_period_elapsed at frontend
>> (in Linux implementation, sent in bytes, not frames to make the protocol
>> generic and consistent)
>> 3. New request for playback/capture control (XENSND_OP_TRIGGER) with
>> start/pause/stop/resume sub-ops.
>>
>> Along with these changes other comments on the driver were addressed,
>> e.g. split into smaller chunks, moved the driver from misc to xen
>> etc. [5].
>>
>> Hope, this helps to get the full picture of what was discussed and
>> makes it
>> possible to move forward: if the approach seems ok, then I'll start
>> upstreaming the changes to the sndif protocol and then will send the
>> updated
>> version of the driver for the further review.
>
> This message has below line in its header.
>
> > In-Reply-To: <e56a09e9-da66-b748-4e82-4b96a18cef32@gmail.com>
>
> This field is defined in RFC822[1], and recent mail clients use this
> header field to associate the message to a message which the field
> indicates. This results in a series of messages, so-called 'message
> thread'. Iwai-san would like you to start a new message thread for
> your topic. Would you please post this message again without the
> header field?
of course, sorry about that
>
> Generally, receiving no reactions means that readers/reviewers don't
> get enough information for your idea yet. (Of course, there's a
> probability that your work attracts no one...) In this case,
> submitting more resources is better, rather than requesting comments
> to them. For instance, you can point links to backend/frontend
> implementation as para-virtualization drivers which use the new
> feature of interface, if you did work for it. Indicating procedure to
> use a series of your work is better for test, if possible.
>
will do
> [1] https://www.ietf.org/rfc/rfc0822.txt
>
> Regards
>
> Takashi Sakamoto
Thank you,
Oleksandr
prev parent reply other threads:[~2017-11-02 9:55 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-07 12:22 [PATCH RESEND1 00/12] ALSA: vsnd: Add Xen para-virtualized frontend driver Oleksandr Andrushchenko
2017-08-07 12:22 ` [PATCH RESEND1 01/12] ALSA: vsnd: Introduce Xen para-virtualized sound " Oleksandr Andrushchenko
2017-08-07 12:22 ` [PATCH RESEND1 02/12] ALSA: vsnd: Implement driver's probe/remove Oleksandr Andrushchenko
2017-08-07 12:22 ` [PATCH RESEND1 03/12] ALSA: vsnd: Implement Xen bus state handling Oleksandr Andrushchenko
2017-08-07 12:22 ` [PATCH RESEND1 04/12] ALSA: vsnd: Read sound driver configuration from Xen store Oleksandr Andrushchenko
2017-08-07 12:22 ` [PATCH RESEND1 05/12] ALSA: vsnd: Implement Xen event channel handling Oleksandr Andrushchenko
2017-08-07 12:22 ` [PATCH RESEND1 06/12] ALSA: vsnd: Implement handling of shared buffers Oleksandr Andrushchenko
2017-08-07 12:22 ` [PATCH RESEND1 07/12] ALSA: vsnd: Introduce ALSA virtual sound driver Oleksandr Andrushchenko
2017-08-07 12:22 ` [PATCH RESEND1 08/12] ALSA: vsnd: Initialize virtul sound card Oleksandr Andrushchenko
2017-08-07 12:22 ` [PATCH RESEND1 09/12] ALSA: vsnd: Add timer for period interrupt emulation Oleksandr Andrushchenko
2017-08-07 12:22 ` [PATCH RESEND1 10/12] ALSA: vsnd: Implement ALSA PCM operations Oleksandr Andrushchenko
2017-08-07 12:22 ` [PATCH RESEND1 11/12] ALSA: vsnd: Implement communication with backend Oleksandr Andrushchenko
2017-08-07 12:22 ` [PATCH RESEND1 12/12] ALSA: vsnd: Introduce Kconfig option to enable Xen PV sound Oleksandr Andrushchenko
2017-08-10 3:14 ` [PATCH RESEND1 00/12] ALSA: vsnd: Add Xen para-virtualized frontend driver Takashi Sakamoto
2017-08-10 8:10 ` Oleksandr Andrushchenko
2017-08-17 10:05 ` [Xen-devel] " Oleksandr Grytsov
2017-08-18 5:43 ` Takashi Sakamoto
2017-08-18 5:56 ` Oleksandr Andrushchenko
2017-08-18 7:17 ` Takashi Sakamoto
2017-08-18 7:23 ` Oleksandr Andrushchenko
2017-08-22 2:43 ` Takashi Sakamoto
2017-08-23 14:51 ` Oleksandr Grytsov
2017-08-24 4:38 ` Takashi Sakamoto
2017-08-24 7:04 ` Oleksandr Andrushchenko
2017-09-04 7:21 ` Oleksandr Andrushchenko
2017-09-05 7:24 ` [alsa-devel] " Clemens Ladisch
2017-09-12 7:52 ` Oleksandr Grytsov
2017-09-19 8:57 ` Oleksandr Andrushchenko
2017-09-26 11:35 ` Oleksandr Andrushchenko
2017-10-04 6:50 ` Oleksandr Andrushchenko
2017-10-13 6:15 ` Oleksandr Andrushchenko
2017-10-30 6:33 ` [RFC] " Oleksandr Andrushchenko
2017-11-02 9:44 ` Takashi Sakamoto
2017-11-02 9:55 ` Oleksandr Andrushchenko [this message]
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