linux/sound/hda/Kconfig
Takashi Iwai c31427d0d2 ALSA: hda: No preallocation on x86 platforms
Like many other drivers, HD-audio drivers also do PCM buffer
preallocation to assure the buffer pages allocated at the early boot
stage.  This step is useful for platforms that may fail to allocate
the PCM hardware buffers -- which is mostly for either large
continuous pages or with the specific DMA mask (like emu10k1).

OTOH, when a buffer is allocated as SG-buffer and the DMA mask is
either 32 or 64 bits, the allocation almost never fails unless it hits
the real OOM situation.  In such a case, we don't need the
preallocation inevitably unlike the cases above.

That said, we may drop the preallocation for HD-audio that does
allocate via SG-buffers, and the patch achieves it.

However, there is one caveat: the buffer allocation behavior depends
on CONFIG_SND_DMA_SGBUF, and it falls back to the continuous pages
when it's not set.  And, currently this SG buffer allocation is
enabled only on x86 platforms.  So, covering those fall-outs, the
patch adjusts CONFIG_SND_HDA_PREALLOC_SIZE depending on the condition,
and keeps the old behavior as-is for non-x86 platforms.

On x86, the kconfig item is no longer adjustable but always set to
zero for disabling the preallocation.  You can still enable the
preallocation via procfs interface at any time later, too.

Link: https://lore.kernel.org/r/20200120124423.11862-2-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2020-01-21 07:12:08 +01:00

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# SPDX-License-Identifier: GPL-2.0-only
config SND_HDA_CORE
tristate
select REGMAP
config SND_HDA_DSP_LOADER
bool
config SND_HDA_ALIGNED_MMIO
bool
config SND_HDA_COMPONENT
bool
config SND_HDA_I915
bool
select SND_HDA_COMPONENT
config SND_HDA_EXT_CORE
tristate
select SND_HDA_CORE
config SND_HDA_PREALLOC_SIZE
int "Pre-allocated buffer size for HD-audio driver" if !SND_DMA_SGBUF
range 0 32768
default 0 if SND_DMA_SGBUF
default 64 if !SND_DMA_SGBUF
help
Specifies the default pre-allocated buffer-size in kB for the
HD-audio driver. A larger buffer (e.g. 2048) is preferred
for systems using PulseAudio. The default 64 is chosen just
for compatibility reasons.
On x86 systems, the default is zero as we need no preallocation.
Note that the pre-allocation size can be changed dynamically
via a proc file (/proc/asound/card*/pcm*/sub*/prealloc), too.
config SND_INTEL_NHLT
bool
# this config should be selected only for Intel ACPI platforms.
# A fallback is provided so that the code compiles in all cases.
config SND_INTEL_DSP_CONFIG
tristate
select SND_INTEL_NHLT if ACPI
# this config should be selected only for Intel DSP platforms.
# A fallback is provided so that the code compiles in all cases.