kernel.git/include/sound/pcm.h, branch linux-5.5.y

ALSA: pcm: Add the support for sync-stop operation

2019-11-20T18:39:54Z

The standard programming model of a PCM sound driver is to process snd_pcm_period_elapsed() from an interrupt handler. When a running stream is stopped, PCM core calls the trigger-STOP PCM ops, sets the stream state to SETUP, and moves on to the next step. This is performed in an atomic manner -- this could be called from the interrupt context, after all. The problem is that, if the stream goes further and reaches to the CLOSE state immediately, the stream might be still being processed in snd_pcm_period_elapsed() in the interrupt context, and hits a NULL dereference. Such a crash happens because of the atomic operation, and we can't wait until the stream-stop finishes. For addressing such a problem, this commit adds a new PCM ops, sync_stop. This gets called at the appropriate places that need a sync with the stream-stop, i.e. at hw_params, prepare and hw_free. Some drivers already have a similar mechanism implemented locally, and we'll refactor the code later. Link: https://lore.kernel.org/r/20191117085308.23915-7-tiwai@suse.de Signed-off-by: Takashi Iwai

ALSA: pcm: Move PCM_RUNTIME_CHECK() macro into local header

2019-11-20T18:39:54Z

It should be used only in the PCM core code locally. Link: https://lore.kernel.org/r/20191117085308.23915-6-tiwai@suse.de Signed-off-by: Takashi Iwai

ALSA: pcm: Introduce managed buffer allocation mode

2019-11-20T18:39:54Z

This patch adds the support for the feature to automatically allocate and free PCM buffers, so called "managed buffer allocation" mode. It's set up via new PCM helpers, snd_pcm_set_managed_buffer() and snd_pcm_set_managed_buffer_all(), both of which correspond to the existing preallocator helpers, snd_pcm_lib_preallocate_pages() and snd_pcm_lib_preallocate_pages_for_all(). When the new helper is used, it not only performs the pre-allocation of buffers, but also it manages to call snd_pcm_lib_malloc_pages() before the PCM hw_params ops and snd_lib_pcm_free() after the PCM hw_free ops inside PCM core, respectively. This allows drivers to drop the explicit calls of the memory allocation / release functions, and it will be a good amount of code reduction in the end of this patch series. When the PCM substream is set to the managed buffer allocation mode, the managed_buffer_alloc flag is set in the substream object. Since some drivers want to know when a buffer is newly allocated or re-allocated at hw_params callback (e.g. want to set up the additional stuff for the given buffer only at allocation time), now PCM core turns on buffer_changed flag when the buffer has changed. The standard conversions to use the new API will be straightforward: - Replace snd_pcm_lib_preallocate*() calls with the corresponding snd_pcm_set_managed_buffer*(); the arguments should be unchanged - Drop superfluous snd_pcm_lib_malloc() and snd_pcm_lib_free() calls; the check of snd_pcm_lib_malloc() returns should be replaced with the check of runtime->buffer_changed flag. - If hw_params or hw_free becomes empty, drop them from PCM ops Link: https://lore.kernel.org/r/20191117085308.23915-2-tiwai@suse.de Signed-off-by: Takashi Iwai

ALSA: pcm: Unexport snd_pcm_sgbuf_ops_page

2019-11-09T17:02:53Z

The helper is no longer referred after the recent code refactoring. Drop the export for saving some bits and future misuse. Acked-by: Mark Brown Link: https://lore.kernel.org/r/20191108094641.20086-9-tiwai@suse.de Signed-off-by: Takashi Iwai

ALSA: pcm: add support for 352.8KHz and 384KHz sample rate

2019-08-28T10:53:49Z

Most of the modern codecs supports 352.8KHz and 384KHz sample rates. Currenlty HW params fails to set 352.8Kz and 384KHz sample rate as these are not in known rates list. Add these new rates to known list to allow them. This patch also adds defines in pcm.h so that drivers can use it. Signed-off-by: Vidyakumar Athota Signed-off-by: Banajit Goswami Signed-off-by: Srinivas Kandagatla Link: https://lore.kernel.org/r/20190822095653.7200-2-srinivas.kandagatla@linaro.org Signed-off-by: Mark Brown

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156

2019-05-30T18:26:35Z

Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 59 temple place suite 330 boston ma 02111 1307 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1334 file(s). Signed-off-by: Thomas Gleixner Reviewed-by: Allison Randal Reviewed-by: Richard Fontana Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de Signed-off-by: Greg Kroah-Hartman

ALSA: pcm: Fix function name in kernel-doc comment

2019-03-13T20:26:32Z

Signed-off-by: Ricardo Biehl Pasquali Signed-off-by: Takashi Iwai

ALSA: pcm: Define snd_pcm_lib_preallocate_*() as returning void

2019-02-08T13:24:12Z

Now all callers no longer check the return value from snd_pcm_lib_preallocate_pages() and co, let's make them to return void, so that any new code won't fall into the same pitfall. Reviewed-by: Jaroslav Kysela Signed-off-by: Takashi Iwai

Merge branch 'topic/pcm-lock-refactor' into for-next

2019-01-24T13:46:21Z

Pull PCM lock refactoring. Signed-off-by: Takashi Iwai

ALSA: pcm: Simplify proc file destruction

2019-01-24T13:40:25Z

The proc files are recursively freed by calling with the root snd_info_entry object, so we don't have to keep each object for releasing one by one. Move the release of the PCM stream proc root at the beginning, so that we can remove the redundant code and resource. Signed-off-by: Takashi Iwai