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dma-direct: use phys_to_dma

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This means it uses whatever linear remapping scheme that the architecture
provides is used in the generic dma_direct ops.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Vladimir Murzin <vladimir.murzin@arm.com>
This commit is contained in:
Christoph Hellwig 2017-12-22 11:29:51 +01:00
parent 002e67454f
commit 2e86a04780
1 changed files with 7 additions and 11 deletions
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18
lib/dma-direct.c
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@ -1,12 +1,11 @@
// SPDX-License-Identifier: GPL-2.0 // SPDX-License-Identifier: GPL-2.0
/* /*
* lib/dma-noop.c * DMA operations that map physical memory directly without using an IOMMU or
* * flushing caches.
* DMA operations that map to physical addresses without flushing memory.
*/ */
#include <linux/export.h> #include <linux/export.h>
#include <linux/mm.h> #include <linux/mm.h>
#include <linux/dma-mapping.h> #include <linux/dma-direct.h>
#include <linux/scatterlist.h> #include <linux/scatterlist.h>
#include <linux/pfn.h> #include <linux/pfn.h>
@ -17,7 +16,7 @@ static void *dma_direct_alloc(struct device *dev, size_t size,
ret = (void *)__get_free_pages(gfp, get_order(size)); ret = (void *)__get_free_pages(gfp, get_order(size));
if (ret) if (ret)
*dma_handle = virt_to_phys(ret) - PFN_PHYS(dev->dma_pfn_offset); *dma_handle = phys_to_dma(dev, virt_to_phys(ret));
return ret; return ret;
} }
@ -32,7 +31,7 @@ static dma_addr_t dma_direct_map_page(struct device *dev, struct page *page,
unsigned long offset, size_t size, enum dma_data_direction dir, unsigned long offset, size_t size, enum dma_data_direction dir,
unsigned long attrs) unsigned long attrs)
{ {
return page_to_phys(page) + offset - PFN_PHYS(dev->dma_pfn_offset); return phys_to_dma(dev, page_to_phys(page)) + offset;
} }
static int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl, static int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl,
@ -42,12 +41,9 @@ static int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl,
struct scatterlist *sg; struct scatterlist *sg;
for_each_sg(sgl, sg, nents, i) { for_each_sg(sgl, sg, nents, i) {
dma_addr_t offset = PFN_PHYS(dev->dma_pfn_offset);
void *va;
BUG_ON(!sg_page(sg)); BUG_ON(!sg_page(sg));
va = sg_virt(sg);
sg_dma_address(sg) = (dma_addr_t)virt_to_phys(va) - offset; sg_dma_address(sg) = phys_to_dma(dev, sg_phys(sg));
sg_dma_len(sg) = sg->length; sg_dma_len(sg) = sg->length;
} }