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dma-mapping: clearly mark DMA ops as an architecture feature

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DMA ops are a helper for architectures and not for drivers to override
the DMA implementation.

Unfortunately driver authors keep ignoring this.  Make the fact more
clear by renaming the symbol to ARCH_HAS_DMA_OPS and having the two drivers
overriding their dma_ops depend on that.  These drivers should probably be
marked broken, but we can give them a bit of a grace period for that.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com> # for IPU6
Acked-by: Robin Murphy <robin.murphy@arm.com>
This commit is contained in:
Christoph Hellwig
2024-08-28 09:02:47 +03:00
parent 92193b3569
commit de6c85bf91
18 changed files with 41 additions and 26 deletions
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9
kernel/dma/Kconfig
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@@ -11,11 +11,6 @@ config HAS_DMA
config DMA_OPS_HELPERS
bool
config DMA_OPS
depends on HAS_DMA
select DMA_OPS_HELPERS
bool
#
# IOMMU drivers that can bypass the IOMMU code and optionally use the direct
# mapping fast path should select this option and set the dma_ops_bypass
@@ -113,8 +108,8 @@ config DMA_BOUNCE_UNALIGNED_KMALLOC
config DMA_NEED_SYNC
def_bool ARCH_HAS_SYNC_DMA_FOR_DEVICE || ARCH_HAS_SYNC_DMA_FOR_CPU || \
ARCH_HAS_SYNC_DMA_FOR_CPU_ALL || DMA_API_DEBUG || DMA_OPS || \
SWIOTLB
ARCH_HAS_SYNC_DMA_FOR_CPU_ALL || DMA_API_DEBUG || \
ARCH_HAS_DMA_OPS || SWIOTLB
config DMA_RESTRICTED_POOL
bool "DMA Restricted Pool"