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| author |   Vineet Gupta <vgupta@synopsys.com> | 2016-03-14 15:03:59 +0530 |
|---|---|---|
| committer | Vineet Gupta <vgupta@synopsys.com> | 2016-03-19 14:34:08 +0530 |
| commit | d98a15a5653bfae5bccc68a06a60ccf035b2c4cc (patch) | |
| tree | 4e4c11c4c5bff82b61e44f6066ed8af6755add2b /arch | |
| parent | ARC: build: Turn off -Wmaybe-uninitialized for ARC gcc 4.8 (diff) | |
| download | linux-dev-d98a15a5653bfae5bccc68a06a60ccf035b2c4cc.tar.xz linux-dev-d98a15a5653bfae5bccc68a06a60ccf035b2c4cc.zip | |
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arc/mm/dma.c | 25 |
1 files changed, 17 insertions, 8 deletions
diff --git a/arch/arc/mm/dma.c b/arch/arc/mm/dma.c index 01eaf88bf821..6cf1d924209a 100644 --- a/arch/arc/mm/dma.c +++ b/arch/arc/mm/dma.c @@ -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)); } /* |