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Message-ID: <20161025153828.4815.11023.stgit@ahduyck-blue-test.jf.intel.com>
Date: Tue, 25 Oct 2016 11:38:29 -0400
From: Alexander Duyck <alexander.h.duyck@...el.com>
To: netdev@...r.kernel.org, intel-wired-lan@...ts.osuosl.org,
linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc: brouer@...hat.com, Rich Felker <dalias@...c.org>,
davem@...emloft.net, Yoshinori Sato <ysato@...rs.sourceforge.jp>,
linux-sh@...r.kernel.org
Subject: [net-next PATCH 19/27] arch/sh: 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.
Cc: Yoshinori Sato <ysato@...rs.sourceforge.jp>
Cc: Rich Felker <dalias@...c.org>
Cc: linux-sh@...r.kernel.org
Signed-off-by: Alexander Duyck <alexander.h.duyck@...el.com>
---
arch/sh/kernel/dma-nommu.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/arch/sh/kernel/dma-nommu.c b/arch/sh/kernel/dma-nommu.c
index eadb669..47fee3b 100644
--- a/arch/sh/kernel/dma-nommu.c
+++ b/arch/sh/kernel/dma-nommu.c
@@ -18,7 +18,9 @@ static dma_addr_t nommu_map_page(struct device *dev, struct page *page,
dma_addr_t addr = page_to_phys(page) + offset;
WARN_ON(size == 0);
- dma_cache_sync(dev, page_address(page) + offset, size, dir);
+
+ if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
+ dma_cache_sync(dev, page_address(page) + offset, size, dir);
return addr;
}
@@ -35,7 +37,8 @@ static int nommu_map_sg(struct device *dev, struct scatterlist *sg,
for_each_sg(sg, s, nents, i) {
BUG_ON(!sg_page(s));
- dma_cache_sync(dev, sg_virt(s), s->length, dir);
+ if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
+ dma_cache_sync(dev, sg_virt(s), s->length, dir);
s->dma_address = sg_phys(s);
s->dma_length = s->length;
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