From: Jaroslav Kysela <perex@perex.cz>
To: ALSA development <alsa-devel@alsa-project.org>
Cc: Baolin Wang <baolin.wang@linaro.org>,
Takashi Iwai <tiwai@suse.de>, Phil Burk <philburk@google.com>,
Zach Riggle <riggle@google.com>, Mark Brown <broonie@kernel.org>,
Leo Yan <leo.yan@linaro.org>
Subject: [PATCH 0/2 v4] ALSA: pcm: anonymous dup implementation
Date: Mon, 4 Feb 2019 10:39:08 +0100 [thread overview]
Message-ID: <20190204093910.23878-1-perex@perex.cz> (raw)
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
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
Cc: Phil Burk <philburk@google.com>
Cc: Zach Riggle <riggle@google.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Baolin Wang <baolin.wang@linaro.org>
Jaroslav Kysela (2):
ALSA: pcm: implement the anonymous dup (inode file descriptor)
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 | 97 ++++++++++++++++++++++++++++++++++++++++++---
6 files changed, 110 insertions(+), 19 deletions(-)
--
2.13.6
next reply other threads:[~2019-02-04 9:39 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-04 9:39 Jaroslav Kysela [this message]
2019-02-04 9:39 ` [PATCH 1/2] ALSA: pcm: implement the anonymous dup (inode file descriptor) Jaroslav Kysela
2019-02-04 9:39 ` [PATCH 2/2] ALSA: pcm: implement the mmap buffer mode for the anonymous dup Jaroslav Kysela
2019-02-04 10:48 ` Takashi Iwai
2019-02-07 17:41 ` [PATCH 0/2 v4] ALSA: pcm: anonymous dup implementation Phil Burk
2019-02-07 17:53 ` Jaroslav Kysela
2019-02-08 15:57 ` Phil Burk
2019-03-26 14:09 ` Mark Brown
2019-03-26 14:13 ` Takashi Iwai
2019-03-26 14:27 ` Phil Burk
2019-03-26 14:41 ` Jaroslav Kysela
2019-04-23 18:08 ` Takashi Iwai
2019-04-23 20:11 ` Phil Burk
2019-04-23 20:25 ` Takashi Iwai
2020-06-08 13:45 ` Mark Brown
2020-06-08 17:49 ` Phil Burk
2020-06-10 23:10 ` Phil Burk
2020-06-12 16:59 ` Mark Brown
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