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[0/2] ALSA: memalloc: Fix for Xen PV and non-IOMMU systems

Message ID 20230124092744.27370-1-tiwai@suse.de
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Series ALSA: memalloc: Fix for Xen PV and non-IOMMU systems | expand

Message

Takashi Iwai Jan. 24, 2023, 9:27 a.m. UTC 
Hi,

this is a patch series to address the recent regression on Xen PV (and
possibly non-IOMMU) systems about the SG-buffer memory allocation.
We switched to use dma_alloc_noncontiguous() as hoped it handling
everything right, but it turned out that this doesn't work always.
So this is one step back, use the explicit SG-buffer with
dma_alloc_coherent() calls, but in a bit more optimized ways, and also
applying only for those systems.


Takashi

===

Takashi Iwai (2):
  ALSA: memalloc: Explicit SG-allocations for Xen PV and non-IOMMU
    systems
  ALSA: memalloc: Use coherent DMA allocation for fallback again

 sound/core/memalloc.c | 68 +++++++++++++++++++++++++++++++++----------
 1 file changed, 53 insertions(+), 15 deletions(-)