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Tue, 10 Nov 2026 16:05:56 -0800 (PST) Received: from localhost.localdomain ([183.96.175.225]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3b1838e616dsm474361a91.4.2026.11.10.16.05.53 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Tue, 10 Nov 2026 16:05:55 -0800 (PST) From: Joonho Lee To: linux-sound@vger.kernel.org Cc: tiwai@suse.com, perex@perex.cz, anton.yakovlev@opensynergy.com, mst@redhat.com, virtualization@lists.linux.dev, linux-kernel@vger.kernel.org, corbet@lwn.net, skhan@linuxfoundation.org, rdunlap@infradead.org, linux-doc@vger.kernel.org, Joonho Lee Subject: [PATCH v24 02/16] ALSA: pcm: report partial progress under the stream lock Date: Wed, 11 Nov 2026 09:05:29 +0900 Message-ID: <20261111000543.28550-3-mynameisjune111@gmail.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20261111000543.28550-1-mynameisjune111@gmail.com> References: <20261111000543.28550-1-mynameisjune111@gmail.com> X-Mailing-List: virtualization@lists.linux.dev List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Allow a driver to publish subperiod progress under the PCM stream lock without generating a period timer notification. Use the ordinary pointer update, XRUN and wakeup path. Capture DRAINING can publish its final tail while playback and other inactive states retain their existing behavior. Assisted-by: LLM Signed-off-by: Joonho Lee --- include/sound/pcm.h | 1 + sound/core/pcm_lib.c | 24 ++++++++++++++++++++++++ 2 files changed, 25 insertions(+) diff --git a/include/sound/pcm.h b/include/sound/pcm.h --- a/include/sound/pcm.h +++ b/include/sound/pcm.h @@ -1182,6 +1182,7 @@ int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg); void snd_pcm_period_elapsed_under_stream_lock(struct snd_pcm_substream *substream); +void snd_pcm_progress_under_stream_lock(struct snd_pcm_substream *substream); void snd_pcm_period_elapsed(struct snd_pcm_substream *substream); snd_pcm_sframes_t __snd_pcm_lib_xfer(struct snd_pcm_substream *substream, void *buf, bool interleaved, diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c --- a/sound/core/pcm_lib.c +++ b/sound/core/pcm_lib.c @@ -1919,6 +1919,30 @@ EXPORT_SYMBOL(snd_pcm_period_elapsed_under_stream_lock); /** + * snd_pcm_progress_under_stream_lock - Report progress without a period IRQ + * @substream: PCM substream + * + * Context: PCM stream lock held, with no driver pointer or trigger locks held. + * Updates the pointer and wakes readers for partial-period transfers. Capture + * streams may report their final tail while DRAINING. Unlike a period + * notification, this does not imply an elapsed period or tick the PCM timer. + * The same pointer, trigger and timestamp callbacks may be invoked. + */ +void snd_pcm_progress_under_stream_lock(struct snd_pcm_substream *substream) +{ + if (PCM_RUNTIME_CHECK(substream)) + return; + if (!snd_pcm_running(substream) && + !(substream->stream == SNDRV_PCM_STREAM_CAPTURE && + substream->runtime->state == SNDRV_PCM_STATE_DRAINING)) + return; + snd_pcm_update_hw_ptr(substream); + snd_kill_fasync(substream->runtime->fasync, SIGIO, POLL_IN); +} +EXPORT_SYMBOL_GPL(snd_pcm_progress_under_stream_lock); + + +/** * snd_pcm_period_elapsed() - update the status of runtime for the next period by acquiring lock of * PCM substream. * @substream: the instance of PCM substream.