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dma-direct: factor out a helper for DMA_ATTR_NO_KERNEL_MAPPING allocations

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[ Upstream commit d541ae55d5 ]

Split the code for DMA_ATTR_NO_KERNEL_MAPPING allocations into a separate
helper to make dma_direct_alloc a little more readable.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Christoph Hellwig 2021-10-18 13:08:07 +02:00 • committed by Justin Hammond
parent 8e41adb963
commit a4be532a68
1 changed files with 20 additions and 11 deletions
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31
kernel/dma/direct.c
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@ -149,6 +149,24 @@ static void *dma_direct_alloc_from_pool(struct device *dev, size_t size,
return ret;
}
static void *dma_direct_alloc_no_mapping(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t gfp)
{
struct page *page;
page = __dma_direct_alloc_pages(dev, size, gfp & ~__GFP_ZERO);
if (!page)
return NULL;
/* remove any dirty cache lines on the kernel alias */
if (!PageHighMem(page))
arch_dma_prep_coherent(page, size);
/* return the page pointer as the opaque cookie */
*dma_handle = phys_to_dma_direct(dev, page_to_phys(page));
return page;
}
void *dma_direct_alloc(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
{
@ -161,17 +179,8 @@ void *dma_direct_alloc(struct device *dev, size_t size,
gfp |= __GFP_NOWARN;
if ((attrs & DMA_ATTR_NO_KERNEL_MAPPING) &&
!force_dma_unencrypted(dev) && !is_swiotlb_for_alloc(dev)) {
page = __dma_direct_alloc_pages(dev, size, gfp & ~__GFP_ZERO);
if (!page)
return NULL;
/* remove any dirty cache lines on the kernel alias */
if (!PageHighMem(page))
arch_dma_prep_coherent(page, size);
*dma_handle = phys_to_dma_direct(dev, page_to_phys(page));
/* return the page pointer as the opaque cookie */
return page;
}
!force_dma_unencrypted(dev) && !is_swiotlb_for_alloc(dev))
return dma_direct_alloc_no_mapping(dev, size, dma_handle, gfp);
if (!IS_ENABLED(CONFIG_ARCH_HAS_DMA_SET_UNCACHED) &&
!IS_ENABLED(CONFIG_DMA_DIRECT_REMAP) &&