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dma-mapping: add (back) arch_dma_mark_clean for ia64

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Add back a hook to optimize dcache flushing after reading executable
code using DMA.  This gets ia64 out of the business of pretending to
be dma incoherent just for this optimization.

Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Christoph Hellwig
2020-08-17 16:41:50 +02:00
parent ef1a85b6ca
commit abdaf11ac1
7 changed files with 23 additions and 17 deletions
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3
include/linux/dma-direct.h
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@@ -150,6 +150,9 @@ static inline void dma_direct_sync_single_for_cpu(struct device *dev,
if (unlikely(is_swiotlb_buffer(paddr)))
swiotlb_tbl_sync_single(dev, paddr, size, dir, SYNC_FOR_CPU);
if (dir == DMA_FROM_DEVICE)
arch_dma_mark_clean(paddr, size);
}
static inline dma_addr_t dma_direct_map_page(struct device *dev,

8
include/linux/dma-noncoherent.h
View File

@@ -108,6 +108,14 @@ static inline void arch_dma_prep_coherent(struct page *page, size_t size)
}
#endif /* CONFIG_ARCH_HAS_DMA_PREP_COHERENT */
#ifdef CONFIG_ARCH_HAS_DMA_MARK_CLEAN
void arch_dma_mark_clean(phys_addr_t paddr, size_t size);
#else
static inline void arch_dma_mark_clean(phys_addr_t paddr, size_t size)
{
}
#endif /* ARCH_HAS_DMA_MARK_CLEAN */
void *arch_dma_set_uncached(void *addr, size_t size);
void arch_dma_clear_uncached(void *addr, size_t size);