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dma-direct: factor out a dma_direct_alloc_from_pool helper

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This ensures dma_direct_alloc_pages will use the right gfp mask, as
well as keeping the code for that common between the two allocators.

Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Christoph Hellwig 2020-10-07 11:06:09 +02:00
parent 08a89c2830
commit 5b138c534f
1 changed files with 20 additions and 19 deletions
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39
kernel/dma/direct.c
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@ -147,6 +147,22 @@ static struct page *__dma_direct_alloc_pages(struct device *dev, size_t size,
return page;
}
static void *dma_direct_alloc_from_pool(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t gfp)
{
struct page *page;
u64 phys_mask;
void *ret;
gfp |= dma_direct_optimal_gfp_mask(dev, dev->coherent_dma_mask,
&phys_mask);
page = dma_alloc_from_pool(dev, size, &ret, gfp, dma_coherent_ok);
if (!page)
return NULL;
*dma_handle = phys_to_dma_direct(dev, page_to_phys(page));
return ret;
}
void *dma_direct_alloc(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
{
@ -163,17 +179,8 @@ void *dma_direct_alloc(struct device *dev, size_t size,
if (attrs & DMA_ATTR_NO_WARN)
gfp |= __GFP_NOWARN;
if (dma_should_alloc_from_pool(dev, gfp, attrs)) {
u64 phys_mask;
gfp |= dma_direct_optimal_gfp_mask(dev, dev->coherent_dma_mask,
&phys_mask);
page = dma_alloc_from_pool(dev, size, &ret, gfp,
dma_coherent_ok);
if (!page)
return NULL;
goto done;
}
if (dma_should_alloc_from_pool(dev, gfp, attrs))
return dma_direct_alloc_from_pool(dev, size, dma_handle, gfp);
/* we always manually zero the memory once we are done */
page = __dma_direct_alloc_pages(dev, size, gfp & ~__GFP_ZERO);
@ -298,13 +305,8 @@ struct page *dma_direct_alloc_pages(struct device *dev, size_t size,
struct page *page;
void *ret;
if (dma_should_alloc_from_pool(dev, gfp, 0)) {
page = dma_alloc_from_pool(dev, size, &ret, gfp,
dma_coherent_ok);
if (!page)
return NULL;
goto done;
}
if (dma_should_alloc_from_pool(dev, gfp, 0))
return dma_direct_alloc_from_pool(dev, size, dma_handle, gfp);
page = __dma_direct_alloc_pages(dev, size, gfp);
if (!page)
@ -327,7 +329,6 @@ struct page *dma_direct_alloc_pages(struct device *dev, size_t size,
goto out_free_pages;
}
memset(ret, 0, size);
done:
*dma_handle = phys_to_dma_direct(dev, page_to_phys(page));
return page;
out_free_pages: