From c31427d0d21e198c74d5d92082c4b8194b257f82 Mon Sep 17 00:00:00 2001 From: Takashi Iwai Date: Mon, 20 Jan 2020 13:44:23 +0100 Subject: [PATCH] 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 --- sound/hda/Kconfig | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/sound/hda/Kconfig b/sound/hda/Kconfig index b0c88fe..4ca6b09 100644 --- a/sound/hda/Kconfig +++ b/sound/hda/Kconfig @@ -21,14 +21,16 @@ config SND_HDA_EXT_CORE select SND_HDA_CORE config SND_HDA_PREALLOC_SIZE - int "Pre-allocated buffer size for HD-audio driver" + int "Pre-allocated buffer size for HD-audio driver" if !SND_DMA_SGBUF range 0 32768 - default 64 + 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. -- 2.7.4