linux-kernel - [net-next PATCH RFC 06/26] arch/blackfin: Add option to skip sync on DMA map

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Message-ID: <20161024120458.16276.10950.stgit@ahduyck-blue-test.jf.intel.com>
Date:   Mon, 24 Oct 2016 08:04:58 -0400
From:   Alexander Duyck <alexander.h.duyck@...el.com>
To:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org
Cc:     brouer@...hat.com, davem@...emloft.net,
        Steven Miao <realmz6@...il.com>
Subject: [net-next PATCH RFC 06/26] arch/blackfin: Add option to skip sync
 on DMA map

The use of DMA_ATTR_SKIP_CPU_SYNC was not consistent across all of the DMA
APIs in the arch/arm folder.  This change is meant to correct that so that
we get consistent behavior.

Cc: Steven Miao <realmz6@...il.com>
Signed-off-by: Alexander Duyck <alexander.h.duyck@...el.com>
---
 arch/blackfin/kernel/dma-mapping.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/blackfin/kernel/dma-mapping.c b/arch/blackfin/kernel/dma-mapping.c
index 53fbbb6..ed9a6a8 100644
--- a/arch/blackfin/kernel/dma-mapping.c
+++ b/arch/blackfin/kernel/dma-mapping.c
@@ -133,6 +133,10 @@ static void bfin_dma_sync_sg_for_device(struct device *dev,
 
 	for_each_sg(sg_list, sg, nelems, i) {
 		sg->dma_address = (dma_addr_t) sg_virt(sg);
+
+		if (attrs & DMA_ATTR_SKIP_CPU_SYNC)
+			continue;
+
 		__dma_sync(sg_dma_address(sg), sg_dma_len(sg), direction);
 	}
 }
@@ -143,7 +147,8 @@ static dma_addr_t bfin_dma_map_page(struct device *dev, struct page *page,
 {
 	dma_addr_t handle = (dma_addr_t)(page_address(page) + offset);
 
-	_dma_sync(handle, size, dir);
+	if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
+		_dma_sync(handle, size, dir);
 	return handle;
 }