[00/24] ALSA: Generic PCM copy ops using sockptr_t

  Hi,

this is a patch set to clean up the PCM copy ops using sockptr_t as a
"universal" pointer, inspired by the recent patch from Andy
Shevchenko:
  https://lore.kernel.org/r/20230721100146.67293-1-andriy.shevchenko@linux.intel.com

Even though it sounds a bit weird, sockptr_t is a generic type that is
used already in wide ranges, and it can fit our purpose, too.  With
sockptr_t, the former split of copy_user and copy_kernel PCM ops can
be unified again gracefully.

The patch set introduces the new PCM ops, converting users, and drops
the old PCM ops.  Most of conversions are straightforward, simply
replacing copy_*_user() with copy_*_sockptr() variants.

Note that the conversion in ASoC will fix a potential problem of ASoC
PCM that has been for long time.  Since ASoC component takes care of
only copy_user, the conversion form/to kernel space might have been
missing.  With this patch set, both cases are handled with sockptr_t
by a single callback.

The patches are lightly tested (with a faked PCM copy implementation
on HD-audio), while most of patches are only compile-tested.


Takashi

===

Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Andrey Utkin <andrey_utkin@fastmail.com>
Cc: Anton Sviridenko <anton@corp.bluecherry.net>
Cc: Arnaud Pouliquen <arnaud.pouliquen@foss.st.com>
Cc: Banajit Goswami <bgoswami@quicinc.com>
Cc: Bluecherry Maintainers <maintainers@bluecherrydvr.com>
Cc: Claudiu Beznea <claudiu.beznea@microchip.com>
Cc: Ismael Luceno <ismael@iodev.co.uk>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: Mark Brown <broonie@kernel.org>
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>
Cc: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
Cc: Olivier Moysan <olivier.moysan@foss.st.com>
Cc: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Cc: linux-media@vger.kernel.org
Cc: xen-devel@lists.xenproject.org

===

Takashi Iwai (24):
  ALSA: pcm: Add copy ops with universal sockptr_t
  ALSA: core: Add memory copy helpers between sockptr and iomem
  ALSA: dummy: Convert to generic PCM copy ops
  ALSA: gus: Convert to generic PCM copy ops
  ALSA: emu8000: Convert to generic PCM copy ops
  ALSA: es1938: Convert to generic PCM copy ops
  ALSA: korg1212: Convert to generic PCM copy ops
  ALSA: nm256: Convert to generic PCM copy ops
  ALSA: rme32: Convert to generic PCM copy ops
  ALSA: rme96: Convert to generic PCM copy ops
  ALSA: hdsp: Convert to generic PCM copy ops
  ALSA: rme9652: Convert to generic PCM copy ops
  ALSA: sh: Convert to generic PCM copy ops
  ALSA: xen: Convert to generic PCM copy ops
  ALSA: pcmtest: Update comment about PCM copy ops
  media: solo6x10: Convert to generic PCM copy ops
  ASoC: component: Add generic PCM copy ops
  ASoC: mediatek: Convert to generic PCM copy ops
  ASoC: qcom: Convert to generic PCM copy ops
  ASoC: dmaengine: Convert to generic PCM copy ops
  ASoC: dmaengine: Use sockptr_t for process callback, too
  ALSA: doc: Update description for the new PCM copy ops
  ASoC: pcm: Drop obsoleted PCM copy_user ops
  ALSA: pcm: Drop obsoleted PCM copy_user and copy_kernel ops

 .../kernel-api/writing-an-alsa-driver.rst     | 59 +++++---------
 drivers/media/pci/solo6x10/solo6x10-g723.c    | 41 ++--------
 include/sound/dmaengine_pcm.h                 |  2 +-
 include/sound/pcm.h                           | 12 +--
 include/sound/soc-component.h                 | 14 ++--
 sound/core/memory.c                           | 39 +++++++++
 sound/core/pcm_lib.c                          | 81 +++++++++----------
 sound/core/pcm_native.c                       |  2 +-
 sound/drivers/dummy.c                         | 12 +--
 sound/drivers/pcmtest.c                       |  2 +-
 sound/isa/gus/gus_pcm.c                       | 23 +-----
 sound/isa/sb/emu8000_pcm.c                    | 79 +++++-------------
 sound/pci/es1938.c                            | 31 ++-----
 sound/pci/korg1212/korg1212.c                 | 46 +++--------
 sound/pci/nm256/nm256.c                       | 42 ++--------
 sound/pci/rme32.c                             | 50 +++---------
 sound/pci/rme96.c                             | 48 +++--------
 sound/pci/rme9652/hdsp.c                      | 42 ++--------
 sound/pci/rme9652/rme9652.c                   | 46 ++---------
 sound/sh/sh_dac_audio.c                       | 25 +-----
 sound/soc/atmel/mchp-pdmc.c                   |  2 +-
 sound/soc/mediatek/common/mtk-btcvsd.c        | 22 ++---
 sound/soc/qcom/lpass-platform.c               | 12 +--
 sound/soc/soc-component.c                     | 10 +--
 sound/soc/soc-generic-dmaengine-pcm.c         | 18 ++---
 sound/soc/soc-pcm.c                           |  4 +-
 sound/soc/stm/stm32_sai_sub.c                 |  2 +-
 sound/xen/xen_snd_front_alsa.c                | 55 +++----------
 28 files changed, 251 insertions(+), 570 deletions(-)