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Message-ID: <aJGM2zXS6hOLDFm1@vaman>
Date: Tue, 5 Aug 2025 10:17:59 +0530
From: Vinod Koul <vkoul@...nel.org>
To: Joris Verhaegen <verhaegen@...gle.com>
Cc: Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
Liam Girdwood <lgirdwood@...il.com>,
Mark Brown <broonie@...nel.org>,
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>, 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,
Miller Liang <millerliang@...gle.com>
Subject: Re: [PATCH v4 2/3] ALSA: compress_offload: Add
SNDRV_COMPRESS_TSTAMP64 ioctl
On 01-08-25, 10:27, Joris Verhaegen wrote:
> The previous patch introduced the internal infrastructure for handling
> 64-bit timestamps. This patch exposes this capability to user-space.
>
> Define the new ioctl command SNDRV_COMPRESS_TSTAMP64, which allows
> applications to fetch the overflow-safe struct snd_compr_tstamp64.
>
> The ioctl dispatch table is updated to handle the new command by
> calling a new snd_compr_tstamp64 handler, while the legacy path is
> renamed to snd_compr_tstamp32 for clarity.
>
> This patch bumps the SNDRV_COMPRESS_VERSION to 0.4.0.
>
> Reviewed-by: Miller Liang <millerliang@...gle.com>
> Tested-by: Joris Verhaegen <verhaegen@...gle.com>
> Signed-off-by: Joris Verhaegen <verhaegen@...gle.com>
> ---
> include/uapi/sound/compress_offload.h | 5 +++--
> sound/core/compress_offload.c | 19 +++++++++++++------
> 2 files changed, 16 insertions(+), 8 deletions(-)
>
> diff --git a/include/uapi/sound/compress_offload.h b/include/uapi/sound/compress_offload.h
> index abd0ea3f86ee..70b8921601f9 100644
> --- a/include/uapi/sound/compress_offload.h
> +++ b/include/uapi/sound/compress_offload.h
> @@ -13,8 +13,7 @@
> #include <sound/asound.h>
> #include <sound/compress_params.h>
>
> -
> -#define SNDRV_COMPRESS_VERSION SNDRV_PROTOCOL_VERSION(0, 3, 0)
> +#define SNDRV_COMPRESS_VERSION SNDRV_PROTOCOL_VERSION(0, 4, 0)
> /**
> * struct snd_compressed_buffer - compressed buffer
> * @fragment_size: size of buffer fragment in bytes
> @@ -208,6 +207,7 @@ struct snd_compr_task_status {
> * Note: only codec params can be changed runtime and stream params cant be
> * SNDRV_COMPRESS_GET_PARAMS: Query codec params
> * SNDRV_COMPRESS_TSTAMP: get the current timestamp value
> + * SNDRV_COMPRESS_TSTAMP64: get the current timestamp value in 64 bit format
> * SNDRV_COMPRESS_AVAIL: get the current buffer avail value.
> * This also queries the tstamp properties
> * SNDRV_COMPRESS_PAUSE: Pause the running stream
> @@ -230,6 +230,7 @@ struct snd_compr_task_status {
> struct snd_compr_metadata)
> #define SNDRV_COMPRESS_TSTAMP _IOR('C', 0x20, struct snd_compr_tstamp)
> #define SNDRV_COMPRESS_AVAIL _IOR('C', 0x21, struct snd_compr_avail)
> +#define SNDRV_COMPRESS_TSTAMP64 _IOR('C', 0x22, struct snd_compr_tstamp64)
> #define SNDRV_COMPRESS_PAUSE _IO('C', 0x30)
> #define SNDRV_COMPRESS_RESUME _IO('C', 0x31)
> #define SNDRV_COMPRESS_START _IO('C', 0x32)
> diff --git a/sound/core/compress_offload.c b/sound/core/compress_offload.c
> index d3164aa07158..445220fdb6a0 100644
> --- a/sound/core/compress_offload.c
> +++ b/sound/core/compress_offload.c
> @@ -736,18 +736,23 @@ snd_compr_set_metadata(struct snd_compr_stream *stream, unsigned long arg)
> return retval;
> }
>
> -static inline int
> -snd_compr_tstamp(struct snd_compr_stream *stream, unsigned long arg)
> +static inline int snd_compr_tstamp(struct snd_compr_stream *stream,
> + unsigned long arg, bool is_32bit)
> {
> struct snd_compr_tstamp64 tstamp64 = { 0 };
> struct snd_compr_tstamp tstamp32 = { 0 };
> + const void *copy_from = &tstamp64;
> + size_t copy_size = sizeof(tstamp64);
> int ret;
>
> ret = snd_compr_update_tstamp(stream, &tstamp64);
> if (ret == 0) {
> - snd_compr_tstamp32_from_64(&tstamp32, &tstamp64);
> - ret = copy_to_user((struct snd_compr_tstamp __user *)arg,
> - &tstamp32, sizeof(tstamp32)) ?
> + if (is_32bit) {
> + snd_compr_tstamp32_from_64(&tstamp32, &tstamp64);
> + copy_from = &tstamp32;
> + copy_size = sizeof(tstamp32);
> + }
Most of the applications and people would be 32bit right now and we
expect this to progressively change, but then this imposes a penalty as
default path is 64 bit, since we expect this ioctl to be called very
frequently, should we do this optimization for 64bit here?
> + ret = copy_to_user((void __user *)arg, copy_from, copy_size) ?
> -EFAULT :
> 0;
> }
> @@ -1327,7 +1332,9 @@ static long snd_compr_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
>
> switch (cmd) {
> case SNDRV_COMPRESS_TSTAMP:
> - return snd_compr_tstamp(stream, arg);
> + return snd_compr_tstamp(stream, arg, true);
> + case SNDRV_COMPRESS_TSTAMP64:
> + return snd_compr_tstamp(stream, arg, false);
> case SNDRV_COMPRESS_AVAIL:
> return snd_compr_ioctl_avail(stream, arg);
> case SNDRV_COMPRESS_PAUSE:
> --
> 2.50.1.565.gc32cd1483b-goog
--
~Vinod
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