Re: [PATCH 1/5 v2] dma-mapping: add generic dma_get_page_shift API
From: Michael Ellerman <mpe@ellerman.id.au>
Date: 2015-10-06 03:43:40
Also in:
linux-nvme, lkml
On Fri, 2015-10-02 at 13:11 -0700, Nishanth Aravamudan wrote:
quoted hunk ↗ jump to hunk
Drivers like NVMe need to be able to determine the page size used for DMA transfers. Add a new API that defaults to return PAGE_SHIFT on all architectures. Signed-off-by: Nishanth Aravamudan <redacted>diff --git a/include/asm-generic/dma-mapping-common.h b/include/asm-generic/dma-mapping-common.h index b1bc954..86e4e97 100644 --- a/include/asm-generic/dma-mapping-common.h +++ b/include/asm-generic/dma-mapping-common.h@@ -355,4 +355,11 @@ static inline int dma_set_mask(struct device *dev, u64 mask) } #endif +#ifndef HAVE_ARCH_DMA_GET_PAGE_SHIFT +static inline unsigned long dma_get_page_shift(struct device *dev) +{ + return PAGE_SHIFT; +} +#endif + #endif
Adding Arnd who is asm-generic maintainer. Arnd/Christoph can one of you give us an ack for this patch? cheers