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dma-mapping: move swiotlb arch helpers to a new header

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phys_to_dma, dma_to_phys and dma_capable are helpers published by
architecture code for use of swiotlb and xen-swiotlb only.  Drivers are
not supposed to use these directly, but use the DMA API instead.

Move these to a new asm/dma-direct.h helper, included by a
linux/dma-direct.h wrapper that provides the default linear mapping
unless the architecture wants to override it.

In the MIPS case the existing dma-coherent.h is reused for now as
untangling it will take a bit of work.

Signed-off-by: Christoph Hellwig <[email protected]>
Acked-by: Robin Murphy <[email protected]>
This commit is contained in:
Christoph Hellwig 2018-01-10 16:21:13 +01:00
commit ea8c64ace8
34 changed files with 165 additions and 195 deletions
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2
drivers/xen/swiotlb-xen.c
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@ -36,7 +36,7 @@
#define pr_fmt(fmt) "xen:" KBUILD_MODNAME ": " fmt
#include <linux/bootmem.h>
#include <linux/dma-mapping.h>
#include <linux/dma-direct.h>
#include <linux/export.h>
#include <xen/swiotlb-xen.h>
#include <xen/page.h>