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dma-direct: add a CONFIG_ARCH_HAS_DMA_ALLOC symbol

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Instead of using arch_dma_alloc if none of the generic coherent
allocators are used, require the architectures to explicitly opt into
providing it.  This will used to deal with the case of m68knommu and
coldfire where we can't do any coherent allocations whatsoever, and
also makes it clear that arch_dma_alloc is a last resort.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Reviewed-by: Greg Ungerer <gerg@linux-m68k.org>
Tested-by: Greg Ungerer <gerg@linux-m68k.org>
This commit is contained in:
Christoph Hellwig
2023-10-05 09:05:36 +02:00
parent da323d4640
commit 2c8ed1b960
5 changed files with 14 additions and 10 deletions
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9
kernel/dma/Kconfig
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@@ -144,6 +144,15 @@ config DMA_DIRECT_REMAP
select DMA_COHERENT_POOL
select DMA_NONCOHERENT_MMAP
#
# Fallback to arch code for DMA allocations. This should eventually go away.
#
config ARCH_HAS_DMA_ALLOC
depends on !ARCH_HAS_DMA_SET_UNCACHED
depends on !DMA_DIRECT_REMAP
depends on !DMA_GLOBAL_POOL
bool
config DMA_CMA
bool "DMA Contiguous Memory Allocator"
depends on HAVE_DMA_CONTIGUOUS && CMA