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Commit d98a15a5 authored by Vineet Gupta's avatar Vineet Gupta
Browse files

ARC: dma: Use struct page based page allocator helpers 



vs. the ones which reutne void *, so that we can handle pages > 4GB
in subsequent patches

Also plug a potential page leak in case ioremap fails

Signed-off-by: default avatarVineet Gupta <vgupta@synopsys.com>
parent a69fe1a2

arch/arc/mm/dma.c

+17 −8
Original line number Diff line number Diff line
@@ -24,15 +24,20 @@ 
static void *arc_dma_alloc(struct device *dev, size_t size,

		dma_addr_t *dma_handle, gfp_t gfp, struct dma_attrs *attrs)

{

	void *paddr, *kvaddr;

	unsigned long order = get_order(size);

	struct page *page;

	phys_addr_t paddr;

	void *kvaddr;



	/* This is linear addr (0x8000_0000 based) */

	paddr = alloc_pages_exact(size, gfp);

	if (!paddr)

	page = alloc_pages(gfp, order);

	if (!page)

		return NULL;



	/* This is bus address, platform dependent */

	*dma_handle = (dma_addr_t)paddr;

	/* This is linear addr (0x8000_0000 based) */

	paddr = page_to_phys(page);



	/* For now bus address is exactly same as paddr */

	*dma_handle = paddr;



	/*

	 * IOC relies on all data (even coherent DMA data) being in cache
@@ -51,8 +56,10 @@ static void *arc_dma_alloc(struct device *dev, size_t size, 


	/* This is kernel Virtual address (0x7000_0000 based) */

	kvaddr = ioremap_nocache((unsigned long)paddr, size);

	if (kvaddr == NULL)

	if (kvaddr == NULL) {

		__free_pages(page, order);

		return NULL;

	}



	/*

	 * Evict any existing L1 and/or L2 lines for the backing page
@@ -72,11 +79,13 @@ static void *arc_dma_alloc(struct device *dev, size_t size, 
static void arc_dma_free(struct device *dev, size_t size, void *vaddr,

		dma_addr_t dma_handle, struct dma_attrs *attrs)

{

	struct page *page = virt_to_page(dma_handle);



	if (!dma_get_attr(DMA_ATTR_NON_CONSISTENT, attrs) &&

	    !(is_isa_arcv2() && ioc_exists))

		iounmap((void __force __iomem *)vaddr);



	free_pages_exact((void *)dma_handle, size);

	__free_pages(page, get_order(size));

}



/*