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| author |  Christoph Hellwig <hch@lst.de>
| 2019-10-29 11:01:37 +0100 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de>
| 2019-11-11 10:52:15 +0100 |
| commit | 34dc0ea6bc960f1f57b2148f01a3f4da23f87013 (patch) | |
| tree | f6d10010989435562d0ece0971ed992febe6c26c /kernel/dma/remap.c | |
| parent | dma-direct: remove the dma_handle argument to __dma_direct_alloc_pages (diff) | |
| download | linux-34dc0ea6bc960f1f57b2148f01a3f4da23f87013.tar.gz linux-34dc0ea6bc960f1f57b2148f01a3f4da23f87013.tar.bz2 linux-34dc0ea6bc960f1f57b2148f01a3f4da23f87013.zip | |
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 'kernel/dma/remap.c')
| -rw-r--r-- | kernel/dma/remap.c | 6 |
1 files changed, 0 insertions, 6 deletions
diff --git a/kernel/dma/remap.c b/kernel/dma/remap.c index 90d5ce77c189..3c49499ee6b0 100644 --- a/kernel/dma/remap.c +++ b/kernel/dma/remap.c @@ -259,10 +259,4 @@ void arch_dma_free(struct device *dev, size_t size, void *vaddr, dma_free_contiguous(dev, page, size); } } - -long arch_dma_coherent_to_pfn(struct device *dev, void *cpu_addr, - dma_addr_t dma_addr) -{ - return __phys_to_pfn(dma_to_phys(dev, dma_addr)); -} #endif /* CONFIG_DMA_DIRECT_REMAP */ |