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dma-mapping: bypass indirect calls for dma-direct

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Avoid expensive indirect calls in the fast path DMA mapping
operations by directly calling the dma_direct_* ops if we are using
the directly mapped DMA operations.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>
Tested-by: Jesper Dangaard Brouer <brouer@redhat.com>
Tested-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Christoph Hellwig
2018-12-06 13:39:32 -08:00
parent 190d4e5916
commit 356da6d0cd
20 changed files with 150 additions and 119 deletions
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2
arch/arm/include/asm/dma-mapping.h
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@@ -18,7 +18,7 @@ extern const struct dma_map_ops arm_coherent_dma_ops;
static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
{
return IS_ENABLED(CONFIG_MMU) ? &arm_dma_ops : &dma_direct_ops;
return IS_ENABLED(CONFIG_MMU) ? &arm_dma_ops : NULL;
}
#ifdef __arch_page_to_dma