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dma-mapping: remove the {alloc,free}_noncoherent methods

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It turns out allowing non-contigous allocations here was a rather bad
idea, as we'll now need to define ways to get the pages for mmaping
or dma_buf sharing.  Revert this change and stick to the original
concept.  A different API for the use case of non-contigous allocations
will be added back later.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Tomasz Figa <tfiga@chromium.org>
Tested-by: Ricardo Ribalda <ribalda@chromium.org>:wq
This commit is contained in:
Christoph Hellwig
2020-11-24 16:38:40 +01:00
parent 9dc00b25ea
commit 81d88ce550
5 changed files with 36 additions and 122 deletions
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17
include/linux/dma-mapping.h
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@@ -263,10 +263,19 @@ struct page *dma_alloc_pages(struct device *dev, size_t size,
dma_addr_t *dma_handle, enum dma_data_direction dir, gfp_t gfp);
void dma_free_pages(struct device *dev, size_t size, struct page *page,
dma_addr_t dma_handle, enum dma_data_direction dir);
void *dma_alloc_noncoherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, enum dma_data_direction dir, gfp_t gfp);
void dma_free_noncoherent(struct device *dev, size_t size, void *vaddr,
dma_addr_t dma_handle, enum dma_data_direction dir);
static inline void *dma_alloc_noncoherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, enum dma_data_direction dir, gfp_t gfp)
{
struct page *page = dma_alloc_pages(dev, size, dma_handle, dir, gfp);
return page ? page_address(page) : NULL;
}
static inline void dma_free_noncoherent(struct device *dev, size_t size,
void *vaddr, dma_addr_t dma_handle, enum dma_data_direction dir)
{
dma_free_pages(dev, size, virt_to_page(vaddr), dma_handle, dir);
}
static inline dma_addr_t dma_map_single_attrs(struct device *dev, void *ptr,
size_t size, enum dma_data_direction dir, unsigned long attrs)