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authorChristoph Hellwig <hch@lst.de>2019-10-29 13:01:37 +0300
committerChristoph Hellwig <hch@lst.de>2019-11-11 12:52:15 +0300
commit34dc0ea6bc960f1f57b2148f01a3f4da23f87013 (patch)
treef6d10010989435562d0ece0971ed992febe6c26c /arch/arc
parent4e1003aa56a7d60ddb048e43a7a51368fcfe36af (diff)
downloadlinux-34dc0ea6bc960f1f57b2148f01a3f4da23f87013.tar.xz
dma-direct: provide mmap and get_sgtable method overrides
For dma-direct we know that the DMA address is an encoding of the physical address that we can trivially decode. Use that fact to provide implementations that do not need the arch_dma_coherent_to_pfn architecture hook. Note that we still can only support mmap of non-coherent memory only if the architecture provides a way to set an uncached bit in the page tables. This must be true for architectures that use the generic remap helpers, but other architectures can also manually select it. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Max Filippov <jcmvbkbc@gmail.com>
Diffstat (limited to 'arch/arc')
-rw-r--r--arch/arc/Kconfig1
1 files changed, 0 insertions, 1 deletions
diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig
index 8383155c8c82..4d7b671c8ff4 100644
--- a/arch/arc/Kconfig
+++ b/arch/arc/Kconfig
@@ -6,7 +6,6 @@
config ARC
def_bool y
select ARC_TIMERS
- select ARCH_HAS_DMA_COHERENT_TO_PFN
select ARCH_HAS_DMA_PREP_COHERENT
select ARCH_HAS_PTE_SPECIAL
select ARCH_HAS_SETUP_DMA_OPS