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Commit 043b42bc authored by Alexander Duyck's avatar Alexander Duyck Committed by Linus Torvalds
Browse files

arch/openrisc: add option to skip DMA sync as a part of mapping 

This change allows us to pass DMA_ATTR_SKIP_CPU_SYNC which allows us to
avoid invoking cache line invalidation if the driver will just handle it
via a sync_for_cpu or sync_for_device call.

Link: http://lkml.kernel.org/r/20161110113524.76501.87966.stgit@ahduyck-blue-test.jf.intel.com


Signed-off-by: default avatarAlexander Duyck <alexander.h.duyck@intel.com>
Cc: Jonas Bonn <jonas@southpole.se>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent abdf4799

arch/openrisc/kernel/dma.c

+3 −0
Original line number Diff line number Diff line
@@ -141,6 +141,9 @@ or1k_map_page(struct device *dev, struct page *page, 
	unsigned long cl;

	dma_addr_t addr = page_to_phys(page) + offset;



	if (attrs & DMA_ATTR_SKIP_CPU_SYNC)

		return addr;



	switch (dir) {

	case DMA_TO_DEVICE:

		/* Flush the dcache for the requested range */