linux-kernel - [PATCH 01/11] dmaengine: add context parameter to prep_slave_sg and prep_dma

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Date:	Thu,  2 Feb 2012 16:32:11 -0500
From:	Alexandre Bounine <alexandre.bounine@....com>
To:	vinod.koul@...el.com, dan.j.williams@...el.com,
	linux-kernel@...r.kernel.org
Cc:	Alexandre Bounine <alexandre.bounine@....com>,
	akpm@...ux-foundation.org, Jassi Brar <jaswinder.singh@...aro.org>,
	Russell King <rmk@....linux.org.uk>,
	Kumar Gala <galak@...nel.crashing.org>,
	Matt Porter <mporter@...nel.crashing.org>,
	Li Yang <leoli@...escale.com>
Subject: [PATCH 01/11] dmaengine: add context parameter to prep_slave_sg and prep_dma_cyclic

Add context parameter to device_prep_slave_sg() and device_prep_dma_cyclic()
interfaces to allow passing client/target specific information associated
with the data transfer.

Signed-off-by: Alexandre Bounine <alexandre.bounine@....com>
Cc: Jassi Brar <jaswinder.singh@...aro.org>
Cc: Russell King <rmk@....linux.org.uk> 
Cc: Kumar Gala <galak@...nel.crashing.org>
Cc: Matt Porter <mporter@...nel.crashing.org>
Cc: Li Yang <leoli@...escale.com>
---
 include/linux/dmaengine.h |   10 ++++++----
 1 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index 679b349..2251bfa 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -575,10 +575,11 @@ struct dma_device {
 	struct dma_async_tx_descriptor *(*device_prep_slave_sg)(
 		struct dma_chan *chan, struct scatterlist *sgl,
 		unsigned int sg_len, enum dma_transfer_direction direction,
-		unsigned long flags);
+		unsigned long flags, void *context);
 	struct dma_async_tx_descriptor *(*device_prep_dma_cyclic)(
 		struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len,
-		size_t period_len, enum dma_transfer_direction direction);
+		size_t period_len, enum dma_transfer_direction direction,
+		void *context);
 	struct dma_async_tx_descriptor *(*device_prep_interleaved_dma)(
 		struct dma_chan *chan, struct dma_interleaved_template *xt,
 		unsigned long flags);
@@ -607,12 +608,13 @@ static inline int dmaengine_slave_config(struct dma_chan *chan,
 
 static inline struct dma_async_tx_descriptor *dmaengine_prep_slave_single(
 	struct dma_chan *chan, void *buf, size_t len,
-	enum dma_transfer_direction dir, unsigned long flags)
+	enum dma_transfer_direction dir, unsigned long flags, void *context)
 {
 	struct scatterlist sg;
 	sg_init_one(&sg, buf, len);
 
-	return chan->device->device_prep_slave_sg(chan, &sg, 1, dir, flags);
+	return chan->device->device_prep_slave_sg(chan, &sg, 1, dir, flags,
+						  context);
 }
 
 static inline int dmaengine_terminate_all(struct dma_chan *chan)
-- 
1.7.8.4

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