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dma-mapping: consolidate the dma mmap implementations

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The only functional differences (modulo a few missing fixes in the arch
code) is that architectures without coherent caches need a hook to
convert a virtual or dma address into a pfn, given that we don't have
the kernel linear mapping available for the otherwise easy virt_to_page
call.  As a side effect we can support mmap of the per-device coherent
area even on architectures not providing the callback, and we make
previous dangerous default methods dma_common_mmap actually save for
non-coherent architectures by rejecting it without the right helper.

In addition to that we need a hook so that some architectures can
override the protection bits when mmaping a dma coherent allocations.

Signed-off-by: Christoph Hellwig <[email protected]>
Acked-by: Paul Burton <[email protected]> # MIPS parts
This commit is contained in:
Christoph Hellwig 2018-09-11 08:55:28 +02:00
commit 58b0440663
16 changed files with 58 additions and 106 deletions
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2
drivers/xen/swiotlb-xen.c
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@ -662,7 +662,7 @@ xen_swiotlb_dma_mmap(struct device *dev, struct vm_area_struct *vma,
return xen_get_dma_ops(dev)->mmap(dev, vma, cpu_addr,
dma_addr, size, attrs);
#endif
return dma_common_mmap(dev, vma, cpu_addr, dma_addr, size);
return dma_common_mmap(dev, vma, cpu_addr, dma_addr, size, attrs);
}
/*