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dma-direct: handle DMA_ATTR_NO_KERNEL_MAPPING in common code

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DMA_ATTR_NO_KERNEL_MAPPING is generally implemented by allocating
normal cacheable pages or CMA memory, and then returning the page
pointer as the opaque handle.  Lift that code from the xtensa and
generic dma remapping implementations into the generic dma-direct
code so that we don't even call arch_dma_alloc for these allocations.

Signed-off-by: Christoph Hellwig <[email protected]>
This commit is contained in:
Christoph Hellwig 2019-06-14 16:17:27 +02:00
commit d98849aff8
4 changed files with 19 additions and 18 deletions
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8
arch/xtensa/kernel/pci-dma.c
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@ -167,10 +167,6 @@ void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *handle,
*handle = phys_to_dma(dev, page_to_phys(page));
if (attrs & DMA_ATTR_NO_KERNEL_MAPPING) {
return page;
}
#ifdef CONFIG_MMU
if (PageHighMem(page)) {
void *p;
@ -196,9 +192,7 @@ void arch_dma_free(struct device *dev, size_t size, void *vaddr,
unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT;
struct page *page;
if (attrs & DMA_ATTR_NO_KERNEL_MAPPING) {
page = vaddr;
} else if (platform_vaddr_uncached(vaddr)) {
if (platform_vaddr_uncached(vaddr)) {
page = virt_to_page(platform_vaddr_to_cached(vaddr));
} else {
#ifdef CONFIG_MMU