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dma-direct: factor the swiotlb code out of __dma_direct_alloc_pages

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Add a new helper to deal with the swiotlb case.  This keeps the code
nicely boundled and removes the not required call to
dma_direct_optimal_gfp_mask for the swiotlb case.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
This commit is contained in:
Christoph Hellwig 2021-10-21 09:39:12 +02:00
parent f5d3939a59
commit aea7e2a86a
1 changed files with 15 additions and 9 deletions
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24
kernel/dma/direct.c
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@ -102,6 +102,18 @@ static void __dma_direct_free_pages(struct device *dev, struct page *page,
dma_free_contiguous(dev, page, size);
}
static struct page *dma_direct_alloc_swiotlb(struct device *dev, size_t size)
{
struct page *page = swiotlb_alloc(dev, size);
if (page && !dma_coherent_ok(dev, page_to_phys(page), size)) {
swiotlb_free(dev, page, size);
return NULL;
}
return page;
}
static struct page *__dma_direct_alloc_pages(struct device *dev, size_t size,
gfp_t gfp)
{
@ -111,17 +123,11 @@ static struct page *__dma_direct_alloc_pages(struct device *dev, size_t size,
WARN_ON_ONCE(!PAGE_ALIGNED(size));
if (is_swiotlb_for_alloc(dev))
return dma_direct_alloc_swiotlb(dev, size);
gfp |= dma_direct_optimal_gfp_mask(dev, dev->coherent_dma_mask,
&phys_limit);
if (is_swiotlb_for_alloc(dev)) {
page = swiotlb_alloc(dev, size);
if (page && !dma_coherent_ok(dev, page_to_phys(page), size)) {
__dma_direct_free_pages(dev, page, size);
return NULL;
}
return page;
}
page = dma_alloc_contiguous(dev, size, gfp);
if (page && !dma_coherent_ok(dev, page_to_phys(page), size)) {
dma_free_contiguous(dev, page, size);