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linux-stable/include/sound
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Takashi Iwai d4cfb30fce ALSA: pcm: Set per-card upper limit of PCM buffer allocations 
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>
2020-01-21 07:11:55 +01:00
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ac97 ASoC: ac97: convert to SPDX identifiers 2018-07-02 10:56:09 +01:00
sof ASoC: SOF: ipc: introduce message for DSP power gating 2019-10-28 14:43:31 +00:00
ac97_codec.h ALSA: ac97: Treat snd_ac97_bus_ops as const 2020-01-03 09:24:08 +01:00
aci.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ad1816a.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
ad1843.h
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aess.h
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alc5623.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
asequencer.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
asound.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
asoundef.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
compress_driver.h ALSA: compress: Fix regression on compressed capture streams 2019-07-23 12:07:22 +02:00
control.h ALSA: control: Add verification for kctl accesses 2020-01-04 09:37:59 +01:00
core.h ALSA: pcm: Set per-card upper limit of PCM buffer allocations 2020-01-21 07:11:55 +01:00
cs35l33.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
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cs35l36.h ASoC: cs35l36: Add support for Cirrus CS35L36 Amplifier 2019-02-08 13:00:28 +00:00
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designware_i2s.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
dmaengine_pcm.h ASoC: pcm_dmaengine: Extract snd_dmaengine_pcm_refine_runtime_hwparams 2019-10-01 12:18:25 +01:00
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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: Unify get_response handling 2019-12-13 14:36:52 +01:00
hda_component.h i915/snd_hdac: I915 subcomponent for the snd_hdac 2019-02-08 16:58:59 +01:00
hda_hwdep.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 32 2019-05-24 17:27:10 +02:00
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 2020-01-13 13:40:41 +01:00
hda_verbs.h ALSA: hda: add verbs for stripe control 2019-01-14 19:52:23 +01:00
hdaudio.h Merge branch 'for-linus' into for-next 2020-01-20 11:44:51 +01:00
hdaudio_ext.h ALSA: hda: Direct MMIO accesses 2019-08-08 16:36:18 +02:00
hdmi-codec.h ASoC: hdmi-codec: Add an op to set callback function for plug event 2019-09-09 14:50:03 +01:00
hwdep.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
i2c.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
info.h ALSA: info: Make snd_info_entry_ops as const 2020-01-03 09:24:18 +01:00
initval.h ALSA: Allow const arrays for legacy resource management helpers 2020-01-05 16:14:26 +01:00
intel-dsp-config.h ALSA: hda: add Intel DSP configuration / probe code 2019-10-23 06:31:37 +02:00
intel-nhlt.h ALSA: hda: intel-nhlt: handle NHLT VENDOR_DEFINED DMIC geometry 2019-07-31 15:46:00 +02:00
jack.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
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
max9768.h
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max98095.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
memalloc.h ALSA: memalloc: Drop snd_dma_pci_data() macro 2019-11-11 09:14:07 +01:00
minors.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
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pcm-indirect.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 61 2019-05-24 17:36:45 +02:00
pcm.h ALSA: Avoid using timespec for struct snd_pcm_status 2019-12-11 22:06:15 +01:00
pcm_drm_eld.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pcm_iec958.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
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pxa2xx-lib.h ASoC: pxa: remove snd_pcm_ops 2019-10-08 13:47:20 +01:00
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rt5682.h ASoC: rt5682: improve the sensitivity of push button 2019-10-30 14:13:21 +00:00
s3c24xx_uda134x.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
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seq_midi_emul.h ALSA: seq: Constify struct snd_midi_op 2020-01-03 09:24:19 +01:00
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simple_card.h ASoC: simple-card: convert to SPDX identifiers 2018-07-02 10:52:47 +01:00
simple_card_utils.h Merge branch 'for-5.4' of https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound into asoc-5.5 2019-11-06 16:29:34 +00:00
snd_wavefront.h ASoC: Updates for v4.15 2017-11-13 15:45:57 +01:00
soc-acpi-intel-match.h ASoC: Intel: acpi-match: split CNL tables in three 2019-11-12 12:09:36 +00:00
soc-acpi.h ASoC: Intel: skl-hda-dsp-generic: use snd-hda-codec-hdmi 2019-10-29 17:31:54 +00:00
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soc-dai.h ASoC: soc-dai: use bit field for bus_control 2019-08-22 18:30:26 +01:00
soc-dapm.h Merge branch 'asoc-5.4' into asoc-next 2019-09-09 14:55:20 +01:00
soc-dpcm.h ASoC: soc-dpcm: tidyup for_each_dpcm_xx() macro 2019-10-25 11:06:35 +01:00
soc-topology.h ASoC: topology: unload physical dai link in remove 2019-02-04 11:59:30 +01:00
soc.h ASoC: core: Init pcm runtime work early to avoid warnings 2019-12-04 11:15:30 +00:00
sof.h ASoC: SOF: support alternate list of machines 2019-10-07 19:43:40 +01:00
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