arm64: Implement custom mmap functions for dma mapping

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The current dma_ops do not specify an mmap function so maping
falls back to the default implementation. There are at least
two issues with using the default implementation:

1) The pgprot is always pgprot_noncached (strongly ordered)
memory even with coherent operations
2) dma_common_mmap calls virt_to_page on the remapped non-coherent
address which leads to invalid memory being mapped.

Fix both these issue by implementing a custom mmap function which
correctly accounts for remapped addresses and sets vm_pg_prot
appropriately.

Signed-off-by: Laura Abbott <lauraa@codeaurora.org>
[catalin.marinas@arm.com: replaced "arm64_" with "__" prefix for consistency]
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

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Laura Abbott 2014-03-14 19:52:23 +00:00 • committed by Catalin Marinas

parent 31b1e940c5

commit 6e8d7968e9

1 changed files with 44 additions and 0 deletions

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arch/arm64/mm/dma-mapping.c

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