Re: [Xen-devel] vsnd issue

[Oleksandr Grytsov <al1img@xxxxxxxxx>]

On Mon, Nov 25, 2019 at 2:25 PM Peng Fan <peng.fan@xxxxxxx> wrote:
>
> > Cc: sstabellini@xxxxxxxxxx; julien@xxxxxxx; xen-devel@xxxxxxxxxxxxx
> > Subject: Re: [Xen-devel] vsnd issue
> >
> > On 11/25/19 12:40 PM, Artem Mygaiev wrote:
> > > Hello Peng Fan
> > >
> > > Please contact Oleksandr Andrushchenko (added to this thread) on this
> > > issue.
> > >
> > >   -- Artem
> > >
> > > On Mon, 2019-11-25 at 10:24 +0000, Julien Grall wrote:
> > >> On 25/11/2019 10:19, Peng Fan wrote:
> > >>> Hi All,
> > >> Hi,
> > >>
> > >>> I am trying vsnd from xen-troops with xen 4.13 and Linux 5.4, but
> > >>> domu reports:
> > >> xen-troops is not part of Xen Project. Please contact the owner of
> > >> the repo for any help here.
> > >>
> > >> I have CCed Artem who should be able to point to the author of vsnd.
> > >>
> > >> Best regards,
> > >>
> > >>> aplay compl.mp3
> > Hm, could you please try the same with wav and not mp3 and get back with
> > the logs?
>
> Same issue.
> aplay hu01_48k.wav
> ALSA lib 
> ../../../alsa-lib-1.1.9/src/pcm/pcm_direct.c:1156:(snd1_pcm_direct_initialize_slave)
>  slave plugin does not support mmap interleaved or mmap noninterleaved access
> ALSA lib ../../../alsa-lib-1.1.9/src/pcm/pcm_dmix.c:1120:(snd_pcm_dmix_open) 
> unable to initialize slave
> aplay: main:828: audio open error: Invalid argument
>
> Is there any limitation with current vsnd? Is there any plan to upstream 
> libxenbe and snd_be
> to xen?
>
> Thanks,
> Peng.
>
> > >>> ALSA lib ../../../alsa-lib-
> > >>> 1.1.9/src/pcm/pcm_direct.c:1156:(snd1_pcm_direct_initialize_slave)
> > >>> slave plugin does not support mmap interleaved or mmap
> > >>> noninterleaved access
> > ALSA frontend does not support mmap because of [1], so this is expected
> > >>> ALSA lib ../../../alsa-lib-
> > >>> 1.1.9/src/pcm/pcm_dmix.c:1120:(snd_pcm_dmix_open) unable to
> > >>> initialize slave
> > >>> aplay: main:828: audio open error: Invalid argument
> > >>>
> > >>> When executing aplay in domu, dom0 side log:
> > >>> root@imx8qmmek:~# 13.11.19 08:24:57.484 | XenEvtchn       | DBG
> > -
> > >>> Event received, port: 10
> > >>> 13.11.19 08:24:57.491 | StreamRing      | DBG - Request received,
> > >>> id: alsa<hw:2;0>, cmd:9
> > >>> 13.11.19 08:24:57.500 | CommandHandler  | DBG - Handle command
> > >>> [QUERY_HW_PARAM]
> > >>> 13.11.19 08:24:57.508 | AlsaPcm         | DBG - Query pcm device
> > >>> hw:2,0 for HW parameters
> > >>> 13.11.19 08:24:57.516 | CommandHandler  | DBG - Return status: [0]
> > >>> 13.11.19 08:24:57.523 | XenEvtchn       | DBG - Notify event
> > >>> channel, port: 10
> > >>> 13.11.19 08:24:57.531 | XenEvtchn       | DBG - Event received,
> > >>> port: 10
> > >>> 13.11.19 08:24:57.538 | StreamRing      | DBG - Request received,
> > >>> id: alsa<hw:2;0>, cmd:9
> > >>> 13.11.19 08:24:57.546 | CommandHandler  | DBG - Handle command
> > >>> [QUERY_HW_PARAM]
> > >>> 13.11.19 08:24:57.554 | AlsaPcm         | DBG - Query pcm device
> > >>> hw:2,0 for HW parameters
> > >>> 13.11.19 08:24:57.563 | CommandHandler  | DBG - Return status: [0]
> > >>> 13.11.19 08:24:57.570 | XenEvtchn       | DBG - Notify event
> > >>> channel, port: 10
> > >>> 13.11.19 08:24:57.577 | XenEvtchn       | DBG - Event received,
> > >>> port: 10
> > >>> 13.11.19 08:24:57.584 | StreamRing      | DBG - Request received,
> > >>> id: alsa<hw:2;0>, cmd:9
> > >>> 13.11.19 08:24:57.593 | CommandHandler  | DBG - Handle command
> > >>> [QUERY_HW_PARAM]
> > >>> 13.11.19 08:24:57.601 | AlsaPcm         | DBG - Query pcm device
> > >>> hw:2,0 for HW parameters
> > >>> 13.11.19 08:24:57.610 | CommandHandler  | DBG - Return status: [0]
> > >>> 13.11.19 08:24:57.616 | XenEvtchn       | DBG - Notify event
> > >>> channel, port: 10
> > >>> 13.11.19 08:24:57.624 | XenEvtchn       | DBG - Event received,
> > >>> port: 10
> > >>> 13.11.19 08:24:57.631 | StreamRing      | DBG - Request received,
> > >>> id: alsa<hw:2;0>, cmd:9
> > >>> 13.11.19 08:24:57.640 | CommandHandler  | DBG - Handle command
> > >>> [QUERY_HW_PARAM]
> > >>> 13.11.19 08:24:57.647 | AlsaPcm         | DBG - Query pcm device
> > >>> hw:2,0 for HW parameters
> > >>> 13.11.19 08:24:57.656 | CommandHandler  | DBG - Return status: [0]
> > >>> 13.11.19 08:24:57.663 | XenEvtchn       | DBG - Notify event
> > >>> channel, port: 10
> > >>> 13.11.19 08:24:57.671 | XenEvtchn       | DBG - Event received,
> > >>> port: 10
> > >>> 13.11.19 08:24:57.678 | StreamRing      | DBG - Request received,
> > >>> id: alsa<hw:2;0>, cmd:9
> > >>> 13.11.19 08:24:57.686 | CommandHandler  | DBG - Handle command
> > >>> [QUERY_HW_PARAM]
> > >>> 13.11.19 08:24:57.694 | AlsaPcm         | DBG - Query pcm device
> > >>> hw:2,0 for HW parameters
> > >>> 13.11.19 08:24:57.703 | CommandHandler  | DBG - Return status: [0]
> > >>> 13.11.19 08:24:57.709 | XenEvtchn       | DBG - Notify event
> > >>> channel, port: 10
> > >>>
> > >>>
> > >>> My xl.cfg:
> > >>>       vsnd = [
> > >>>           ['CARD, short-name=Main,
> > sample-formats=s16_le;s8;u32_be',
> > >>>               'PCM, name=Main',
> > >>>                   'STREAM, unique-id=alsa<hw:2;0>, type=p',
> > >>>                   'STREAM, unique-id=alsa<hw:2;1>, type=c,
> > channels-
> > >>> max=2'
> > >>>           ],
> > >>>       ]
> > Config seems to be ok
> > >>> The audio device on my board:
> > >>> aplay -l
> > >>> **** List of PLAYBACK Hardware Devices **** card 0: imxaudmix
> > >>> [imx-audmix], device 0: HiFi-AUDMIX-FE (*) []
> > >>>     Subdevices: 1/1
> > >>>     Subdevice #0: subdevice #0
> > >>> card 0: imxaudmix [imx-audmix], device 1: HiFi-AUDMIX-FE (*) []
> > >>>     Subdevices: 1/1
> > >>>     Subdevice #0: subdevice #0
> > >>> card 1: cs42888audio [cs42888-audio], device 0: HiFi cs42888-0 [HiFi
> > >>> cs42888-0]
> > >>>     Subdevices: 1/1
> > >>>     Subdevice #0: subdevice #0
> > >>> card 1: cs42888audio [cs42888-audio], device 1: HiFi-ASRC-FE (*) []
> > >>>     Subdevices: 1/1
> > >>>     Subdevice #0: subdevice #0
> > >>> card 2: wm8960audio [wm8960-audio], device 0: HiFi wm8960-hifi-0 []
> > >>>     Subdevices: 0/1
> > >>>     Subdevice #0: subdevice #0
> > >>>
> > >>> Is there something wrong in my configuration?
> > >>>
> > >>> Thanks,
> > >>> Peng.
> > >>>
> > >>> _______________________________________________
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> > >>>
> > ldefense.com%2Fv3%2F__https%3A%2F%2Flists.xenproject.org%2Fmailman
> > %2
> > >>>
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> > >>>
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> > Cpeng.
> > >>>
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> > b4c6fa
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> > >>> 7oBisDswR93cknmIpMaAcF70HqGKns%3D&amp;reserved=0
> > >>>
> > >>>
> > >>
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> > 7Cp
> > >
> > eng.fan%40nxp.com%7Ca70282eacf484b0c054408d77196071d%7C686ea1d
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> > https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Felixir.b
> > ootlin.com%2Flinux%2Fv5.4-rc8%2Fsource%2Fsound%2Fxen%2Fxen_snd_fro
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Hi Peng,

When you use ALSA as sound backend on Dom0, HW parameters introduced
in xl.cfg must match ones that real HW has, e.g. format, rate, num channels,
buffer size.

1. You could check your real HW by playing the file on Dom0:

 aplay -D hw:2,0 sound.wav --dump-hw-params

See supported formats, channels, rate and buffer in bytes.
Then update xl.cfg accordingly.

Also make sure that aplay works as expected on your Dom0.

2. I don't see any errors in the sndbe log, could you provide log with place
    where the error occurs.

3. You can use pulseaudio as sound backend on Dom0. Pulseaudio doesn't
require exact matching of real HW params.

-- 
Best Regards,
Oleksandr Grytsov.

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