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| author | Takashi Iwai <tiwai@suse.de> | 2022-11-12 09:47:18 +0100 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2022-11-12 09:48:51 +0100 |
| commit | 9d8e536d36e75e76614fe09ffab9a1df95b8b666 (patch) | |
| tree | dfc3999923e3facea7df340060046d41e01dfe15 | |
| parent | 9a5523f72bd2b0d66eef3d58810c6eb7b5ffc143 (diff) | |
| download | lwn-9d8e536d36e75e76614fe09ffab9a1df95b8b666.tar.gz lwn-9d8e536d36e75e76614fe09ffab9a1df95b8b666.zip | |
ALSA: memalloc: Try dma_alloc_noncontiguous() at first
The latest fix for the non-contiguous memalloc helper changed the
allocation method for a non-IOMMU system to use only the fallback
allocator. This should have worked, but it caused a problem sometimes
when too many non-contiguous pages are allocated that can't be treated
by HD-audio controller.
As a quirk workaround, go back to the original strategy: use
dma_alloc_noncontiguous() at first, and apply the fallback only when
it fails, but only for non-IOMMU case.
We'll need a better fix in the fallback code as well, but this
workaround should paper over most cases.
Fixes: 9736a325137b ("ALSA: memalloc: Don't fall back for SG-buffer with IOMMU")
Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lore.kernel.org/r/CAHk-=wgSH5ubdvt76gNwa004ooZAEJL_1Q-Fyw5M2FDdqL==dg@mail.gmail.com
Link: https://lore.kernel.org/r/20221112084718.3305-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
| -rw-r--r-- | sound/core/memalloc.c | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/sound/core/memalloc.c b/sound/core/memalloc.c index 6a81aaab25ab..ba095558b6d1 100644 --- a/sound/core/memalloc.c +++ b/sound/core/memalloc.c @@ -542,8 +542,10 @@ static void *snd_dma_noncontig_alloc(struct snd_dma_buffer *dmab, size_t size) struct sg_table *sgt; void *p; + sgt = dma_alloc_noncontiguous(dmab->dev.dev, size, dmab->dev.dir, + DEFAULT_GFP, 0); #ifdef CONFIG_SND_DMA_SGBUF - if (!get_dma_ops(dmab->dev.dev)) { + if (!sgt && !get_dma_ops(dmab->dev.dev)) { if (dmab->dev.type == SNDRV_DMA_TYPE_DEV_WC_SG) dmab->dev.type = SNDRV_DMA_TYPE_DEV_WC_SG_FALLBACK; else @@ -551,9 +553,6 @@ static void *snd_dma_noncontig_alloc(struct snd_dma_buffer *dmab, size_t size) return snd_dma_sg_fallback_alloc(dmab, size); } #endif - - sgt = dma_alloc_noncontiguous(dmab->dev.dev, size, dmab->dev.dir, - DEFAULT_GFP, 0); if (!sgt) return NULL; |