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| author | Christoph Hellwig <hch@lst.de> | 2018-09-11 08:55:28 +0200 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2018-09-20 09:01:16 +0200 |
| commit | 58b0440663ec11372befb8ead0ee7099d8878590 (patch) | |
| tree | c613ed22ad229e6612d8c71888d2bb8139163ea8 /arch/mips/Kconfig | |
| parent | dma-mapping: merge direct and noncoherent ops (diff) | |
| download | linux-58b0440663ec11372befb8ead0ee7099d8878590.tar.xz linux-58b0440663ec11372befb8ead0ee7099d8878590.zip | |
dma-mapping: consolidate the dma mmap implementations
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 <hch@lst.de>
Acked-by: Paul Burton <paul.burton@mips.com> # MIPS parts
Diffstat (limited to 'arch/mips/Kconfig')
| -rw-r--r-- | arch/mips/Kconfig | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index 96da6e3396e1..77c022e56e6e 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -1116,10 +1116,11 @@ config DMA_PERDEV_COHERENT config DMA_NONCOHERENT bool + select ARCH_HAS_DMA_MMAP_PGPROT select ARCH_HAS_SYNC_DMA_FOR_DEVICE select ARCH_HAS_SYNC_DMA_FOR_CPU select NEED_DMA_MAP_STATE - select DMA_NONCOHERENT_MMAP + select ARCH_HAS_DMA_COHERENT_TO_PFN select DMA_NONCOHERENT_CACHE_SYNC config SYS_HAS_EARLY_PRINTK |