[alsa-devel] [PATCH v6 0/3] ALSA: pcm: anonymous dup implementation

[Takashi Iwai]

On Mon, 04 Feb 2019 19:38:14 +0100,
Jaroslav Kysela wrote:
> 
> This patchset contains the anonymous dup implementation with permissions
> checking for the ALSA's PCM interface in kernel to enable the restricted
> DMA sound buffer sharing for the restricted tasks.
> 
> The code was tested through qemu and it seems to be pretty stable.
> 
> The initial tinyalsa implementation can be found here:
> 
>   https://github.com/perexg/tinyalsa/commits/anondup
> 
> The filtering might be refined. It depends on the real requirements.
> Perhaps, we may create more ioctl groups. Any comments are more than
> welcome.

Is this patchset targeted for 5.1 merge?

I hesitate to merge it for now, as the new API hasn't been tested much
yet...  If it's for 5.1, we need test coverage and more reviews
quickly.


thanks,

Takashi

> 
> v2 of the patches:
> 
> - change clone parameter to subdevice number for the pcm attach
> - change SNDRV_PCM_PERM_MAX to SNDRV_PCM_PERM_MASK
> - the tinyalsa implementation was a little updated (restructured)
> 
> v3 of the patches:
> 
> - group integer declarations in snd_pcm_anonymous_dup()
> - replaced substream->pcm with pcm in snd_pcm_anonymous_dup()
> - added SNDRV_PCM_PERM_RW check for read/write/readv/writev syscalls
> 
> v4 of the patches:
> 
> - more simple restriction control (only two modes - full/buffer)
> - the tinyalsa implementation follows this change
> 
> v5 of the patches:
> 
> - merge pcm_..._mmap_allowed fcns to the snd_pcm_mmap_... fcns
> 
> v6:
> 
> - add proper open_mutex protection for snd_pcm_open_file()
> 
> Cc: Phil Burk <philburk at google.com>
> Cc: Zach Riggle <riggle at google.com>
> Cc: Mark Brown <broonie at kernel.org>
> Cc: Leo Yan <leo.yan at linaro.org>
> Cc: Baolin Wang <baolin.wang at linaro.org>
> 
> Jaroslav Kysela (3):
>   ALSA: pcm: implement the anonymous dup (inode file descriptor)
>   ALSA: pcm: merge pcm_..._mmap_allowed fcns to the snd_pcm_mmap_...
>     fcns
>   ALSA: pcm: implement the mmap buffer mode for the anonymous dup
> 
>  include/sound/pcm.h         |  10 +--
>  include/uapi/sound/asound.h |   6 +-
>  sound/core/oss/pcm_oss.c    |   2 +-
>  sound/core/pcm.c            |  13 ++--
>  sound/core/pcm_compat.c     |   1 +
>  sound/core/pcm_native.c     | 154 +++++++++++++++++++++++++++++++++-----------
>  6 files changed, 133 insertions(+), 53 deletions(-)
> 
> -- 
> 2.13.6
>