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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: Vineet Gupta <vgupta@synopsys.com>
This commit is contained in:
Vineet Gupta 2016-03-14 15:03:59 +05:30
parent a69fe1a2c9
commit d98a15a565
1 changed files with 17 additions and 8 deletions
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25
arch/arc/mm/dma.c
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@ -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));
}
/*