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Message-ID: <aJGNgphPCTuE7FFD@vaman>
Date: Tue, 5 Aug 2025 10:20:10 +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 3/3] ALSA: compress_offload: Add
SNDRV_COMPRESS_AVAIL64 ioctl
On 01-08-25, 10:27, Joris Verhaegen wrote:
> The previous patch introduced a 64-bit timestamp ioctl
> (SNDRV_COMPRESS_TSTAMP64). To provide a consistent API, this patch
> adds a corresponding 64-bit version of the SNDRV_COMPRESS_AVAIL ioctl.
>
> A new struct snd_compr_avail64 is added to the UAPI, which includes
> the 64-bit timestamp. The existing ioctl implementation is refactored
> to handle both the 32-bit and 64-bit variants.
>
> 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 | 11 +++++++
> sound/core/compress_offload.c | 45 +++++++++++++++++----------
> 2 files changed, 40 insertions(+), 16 deletions(-)
>
> diff --git a/include/uapi/sound/compress_offload.h b/include/uapi/sound/compress_offload.h
> index 70b8921601f9..26f756cc2e62 100644
> --- a/include/uapi/sound/compress_offload.h
> +++ b/include/uapi/sound/compress_offload.h
> @@ -84,6 +84,16 @@ struct snd_compr_avail {
> struct snd_compr_tstamp tstamp;
> } __attribute__((packed, aligned(4)));
>
> +/**
> + * struct snd_compr_avail64 - avail descriptor with tstamp in 64 bit format
> + * @avail: Number of bytes available in ring buffer for writing/reading
> + * @tstamp: timestamp information
> + */
> +struct snd_compr_avail64 {
> + __u64 avail;
> + struct snd_compr_tstamp64 tstamp;
> +} __attribute__((packed, aligned(4)));
> +
> enum snd_compr_direction {
> SND_COMPRESS_PLAYBACK = 0,
> SND_COMPRESS_CAPTURE,
> @@ -231,6 +241,7 @@ struct snd_compr_task_status {
> #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_AVAIL64 _IOR('C', 0x23, struct snd_compr_avail64)
> #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 445220fdb6a0..4d3cf49c0c47 100644
> --- a/sound/core/compress_offload.c
> +++ b/sound/core/compress_offload.c
> @@ -203,13 +203,10 @@ static int snd_compr_update_tstamp(struct snd_compr_stream *stream,
> }
>
> static size_t snd_compr_calc_avail(struct snd_compr_stream *stream,
> - struct snd_compr_avail *avail)
> + struct snd_compr_avail64 *avail)
> {
> - struct snd_compr_tstamp64 tstamp64 = { 0 };
> -
> memset(avail, 0, sizeof(*avail));
> - snd_compr_update_tstamp(stream, &tstamp64);
> - snd_compr_tstamp32_from_64(&avail->tstamp, &tstamp64);
> + snd_compr_update_tstamp(stream, &avail->tstamp);
> /* Still need to return avail even if tstamp can't be filled in */
>
> if (stream->runtime->total_bytes_available == 0 &&
> @@ -233,32 +230,47 @@ static size_t snd_compr_calc_avail(struct snd_compr_stream *stream,
> }
>
> avail->avail = stream->runtime->total_bytes_available -
> - stream->runtime->total_bytes_transferred;
> + stream->runtime->total_bytes_transferred;
Lets not do formatting changes in current patch please
> if (stream->direction == SND_COMPRESS_PLAYBACK)
> avail->avail = stream->runtime->buffer_size - avail->avail;
>
> - pr_debug("ret avail as %llu\n", avail->avail);
> + pr_debug("ret avail as %zu\n", (size_t)avail->avail);
> return avail->avail;
> }
>
> static inline size_t snd_compr_get_avail(struct snd_compr_stream *stream)
> {
> - struct snd_compr_avail avail;
> + struct snd_compr_avail64 avail;
>
> return snd_compr_calc_avail(stream, &avail);
> }
>
> -static int
> -snd_compr_ioctl_avail(struct snd_compr_stream *stream, unsigned long arg)
> +static void snd_compr_avail32_from_64(struct snd_compr_avail *avail32,
> + const struct snd_compr_avail64 *avail64)
> {
> - struct snd_compr_avail ioctl_avail;
> + avail32->avail = avail64->avail;
> + snd_compr_tstamp32_from_64(&avail32->tstamp, &avail64->tstamp);
> +}
> +
> +static int snd_compr_ioctl_avail(struct snd_compr_stream *stream,
> + unsigned long arg, bool is_32bit)
> +{
> + struct snd_compr_avail64 ioctl_avail64;
> + struct snd_compr_avail ioctl_avail32;
> size_t avail;
> + const void *copy_from = &ioctl_avail64;
> + size_t copy_size = sizeof(ioctl_avail64);
>
> if (stream->direction == SND_COMPRESS_ACCEL)
> return -EBADFD;
>
> - avail = snd_compr_calc_avail(stream, &ioctl_avail);
> - ioctl_avail.avail = avail;
> + avail = snd_compr_calc_avail(stream, &ioctl_avail64);
> + ioctl_avail64.avail = avail;
> + if (is_32bit) {
> + snd_compr_avail32_from_64(&ioctl_avail32, &ioctl_avail64);
> + copy_from = &ioctl_avail32;
> + copy_size = sizeof(ioctl_avail32);
> + }
Same comment as previous patch
>
> switch (stream->runtime->state) {
> case SNDRV_PCM_STATE_OPEN:
> @@ -269,8 +281,7 @@ snd_compr_ioctl_avail(struct snd_compr_stream *stream, unsigned long arg)
> break;
> }
>
> - if (copy_to_user((__u64 __user *)arg,
> - &ioctl_avail, sizeof(ioctl_avail)))
> + if (copy_to_user((__u64 __user *)arg, copy_from, copy_size))
> return -EFAULT;
> return 0;
> }
> @@ -1336,7 +1347,9 @@ static long snd_compr_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
> case SNDRV_COMPRESS_TSTAMP64:
> return snd_compr_tstamp(stream, arg, false);
> case SNDRV_COMPRESS_AVAIL:
> - return snd_compr_ioctl_avail(stream, arg);
> + return snd_compr_ioctl_avail(stream, arg, true);
> + case SNDRV_COMPRESS_AVAIL64:
> + return snd_compr_ioctl_avail(stream, arg, false);
> case SNDRV_COMPRESS_PAUSE:
> return snd_compr_pause(stream);
> case SNDRV_COMPRESS_RESUME:
> --
> 2.50.1.565.gc32cd1483b-goog
--
~Vinod
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