linux-kernel - [PATCH v1 0/4] ALSA: compress_offload: Add 64-bit safe timestamp API

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Message-ID: <20250711082441.4193295-1-verhaegen@google.com>
Date: Fri, 11 Jul 2025 09:24:32 +0100
From: George Verhaegen <verhaegen@...gle.com>
To: Vinod Koul <vkoul@...nel.org>, Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>, 
	Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>, 
	Charles Keepax <ckeepax@...nsource.cirrus.com>, 
	Richard Fitzgerald <rf@...nsource.cirrus.com>, David Rhodes <david.rhodes@...rus.com>, 
	Cezary Rojewski <cezary.rojewski@...el.com>, Peter Ujfalusi <peter.ujfalusi@...ux.intel.com>, 
	Bard Liao <yung-chuan.liao@...ux.intel.com>, 
	Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>, 
	Kai Vehmanen <kai.vehmanen@...ux.intel.com>, 
	Pierre-Louis Bossart <pierre-louis.bossart@...ux.dev>, Srinivas Kandagatla <srini@...nel.org>, 
	Daniel Baluta <daniel.baluta@....com>, Orson Zhai <orsonzhai@...il.com>, 
	Baolin Wang <baolin.wang@...ux.alibaba.com>, Chunyan Zhang <zhang.lyra@...il.com>, 
	Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>, Masami Hiramatsu <mhiramat@...nel.org>
Cc: Joris Verhaegen <verhaegen@...gle.com>, kernel-team@...roid.com, 
	linux-sound@...r.kernel.org, linux-kernel@...r.kernel.org, 
	patches@...nsource.cirrus.com, linux-arm-msm@...r.kernel.org, 
	sound-open-firmware@...a-project.org, linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v1 0/4] ALSA: compress_offload: Add 64-bit safe timestamp API

From: Joris Verhaegen <verhaegen@...gle.com>

The current compress offload timestamping API relies on
struct snd_compr_tstamp, whose cumulative counters like
copied_total are defined as __u32. On long-running high-resolution
audio streams, these 32-bit counters can overflow,
causing incorrect availability calculations.

This patch series introduces a parallel, 64-bit safe API to solve
this problem while maintaining perfect backward compatibility with the
existing UAPI. A new pointer64 operation and corresponding ioctls
are added to allow the kernel to track counters using u64 and expose
these full-width values to user-space.

The series is structured as follows:

Patch 1: Introduces the new internal pointer64 op, refactors the
core logic to use it, and defines the new UAPI structs.

Patch 2: Exposes the SNDRV_COMPRESS_TSTAMP64 ioctl.

Patch 3: Exposes the corresponding SNDRV_COMPRESS_AVAIL64 ioctl.

Patch 4: Implements the new .pointer64 operation in various ASoC
drivers that support compress offload.

This series has been tested on a Pixel 9 device. All compress offload
use cases, including long-running playback, were verified to work
correctly with the new 64-bit API, and no regressions were observed
when using the legacy API.

Thanks,
George (Joris) Verhaegen

Signed-off-by: Joris Verhaegen <verhaegen@...gle.com>

---

Joris Verhaegen (4):
  ALSA: compress_offload: Add 64-bit safe timestamp infrastructure
  ALSA: compress_offload: Add SNDRV_COMPRESS_TSTAMP64 ioctl
  ALSA: compress_offload: Add SNDRV_COMPRESS_AVAIL64 ioctl
  ASoC: codecs: Implement 64-bit pointer operation

 include/sound/compress_driver.h               |   3 +
 include/sound/soc-component.h                 |   5 +
 include/sound/soc-dai.h                       |   6 +
 include/uapi/sound/compress_offload.h         |  32 +++
 sound/core/compress_offload.c                 | 210 ++++++++++++++----
 sound/soc/codecs/cs47l15.c                    |   1 +
 sound/soc/codecs/cs47l24.c                    |   1 +
 sound/soc/codecs/cs47l35.c                    |   1 +
 sound/soc/codecs/cs47l85.c                    |   1 +
 sound/soc/codecs/cs47l90.c                    |   1 +
 sound/soc/codecs/cs47l92.c                    |   1 +
 sound/soc/codecs/wm5102.c                     |   1 +
 sound/soc/codecs/wm5110.c                     |   1 +
 sound/soc/codecs/wm_adsp.c                    |  53 ++++-
 sound/soc/codecs/wm_adsp.h                    |   3 +
 .../intel/atom/sst-mfld-platform-compress.c   |  17 +-
 sound/soc/intel/atom/sst-mfld-platform.h      |   2 +
 sound/soc/intel/atom/sst/sst_drv_interface.c  |  43 +++-
 sound/soc/qcom/qdsp6/q6asm-dai.c              |  41 +++-
 sound/soc/soc-component.c                     |  20 ++
 sound/soc/soc-compress.c                      |  21 ++
 sound/soc/soc-dai.c                           |  14 ++
 sound/soc/sof/compress.c                      |  44 +++-
 sound/soc/sprd/sprd-pcm-compress.c            |  28 ++-
 sound/soc/sprd/sprd-pcm-dma.h                 |   2 +-
 sound/soc/uniphier/aio-compress.c             |  40 +++-
 26 files changed, 503 insertions(+), 89 deletions(-)

-- 
2.50.0.727.gbf7dc18ff4-goog