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Takashi Iwai 95b30a4312 ALSA: pcm: Set per-card upper limit of PCM buffer allocations 
[ Upstream commit d4cfb30fce03093ad944e0b44bd8f40bdad5330e ]

Currently, the available buffer allocation size for a PCM stream
depends on the preallocated size; when a buffer has been preallocated,
the max buffer size is set to that size, so that application won't
re-allocate too much memory.  OTOH, when no preallocation is done,
each substream may allocate arbitrary size of buffers as long as
snd_pcm_hardware.buffer_bytes_max allows -- which can be quite high,
HD-audio sets 1GB there.

It means that the system may consume a high amount of pages for PCM
buffers, and they are pinned and never swapped out.  This can lead to
OOM easily.

For avoiding such a situation, this patch adds the upper limit per
card.  Each snd_pcm_lib_malloc_pages() and _free_pages() calls are
tracked and it will return an error if the total amount of buffers
goes over the defined upper limit.  The default value is set to 32MB,
which should be really large enough for usual operations.

If larger buffers are needed for any specific usage, it can be
adjusted (also dynamically) via snd_pcm.max_alloc_per_card option.
Setting zero there means no chceck is performed, and again, unlimited
amount of buffers are allowed.

Link: https://lore.kernel.org/r/20200120124423.11862-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Stable-dep-of: bd55842ed998 ("ALSA: pcm: Fix potential data race at PCM memory allocation helpers")
Signed-off-by: Sasha Levin <sashal@kernel.org>
2023-08-30 16:27:22 +02:00
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ac97 ASoC: ac97: convert to SPDX identifiers 2018-07-02 10:56:09 +01:00
sof Merge branch 'asoc-5.4' into asoc-next 2019-09-09 14:55:20 +01:00
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core.h ALSA: pcm: Set per-card upper limit of PCM buffer allocations 2023-08-30 16:27:22 +02:00
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dmaengine_pcm.h ASoC: dmaengine: Remove unused SND_DMAENGINE_PCM_FLAG_CUSTOM_CHANNEL_NAME flag 2019-02-14 16:17:35 +00:00
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hda_chmap.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
hda_codec.h ALSA: hda: fix jack detection with Realtek codecs when in D3 2020-10-29 09:57:25 +01:00
hda_component.h i915/snd_hdac: I915 subcomponent for the snd_hdac 2019-02-08 16:58:59 +01:00
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hda_i915.h ALSA: hda: Make audio component support more generic 2018-07-17 22:25:48 +02:00
hda_register.h ALSA: hdac: clear link output stream mapping 2019-10-07 03:58:48 +02:00
hda_regmap.h ALSA: hda: Manage concurrent reg access more properly 2020-05-27 17:46:37 +02:00
hda_verbs.h ALSA: hda: add verbs for stripe control 2019-01-14 19:52:23 +01:00
hdaudio_ext.h ALSA/ASoC: hda: move/rename snd_hdac_ext_stop_streams to hdac_stream.c 2023-01-18 11:41:39 +01:00
hdaudio.h ALSA: hda: add snd_hdac_stop_streams() helper 2023-01-18 11:41:39 +01:00
hdmi-codec.h ASoC: hdmi-codec: Add an op to set callback function for plug event 2019-09-09 14:50:03 +01:00
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jack.h ALSA: jack: Access input_dev under mutex 2022-06-14 18:11:25 +02:00
l3.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
madera-pdata.h ASoC: madera: Update SPDX headers 2019-06-26 12:27:50 +01:00
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pcm.h ALSA: pcm: fix undefined behavior in bit shift for SNDRV_PCM_RATE_KNOT 2023-01-18 11:41:04 +01:00
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