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Message-id: <1352109631-3385-7-git-send-email-b.zolnierkie@samsung.com>
Date: Mon, 05 Nov 2012 11:00:17 +0100
From: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
To: linux-kernel@...r.kernel.org
Cc: djbw@...com, dwmw2@...radead.org, hskinnemoen@...il.com,
iws@...o.caltech.edu, vinod.koul@...el.com, vipin.kumar@...com,
t.figa@...sung.com, kyungmin.park@...sung.com,
Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Subject: [PATCH 06/20] DMA: do DMA unmap in core for MEMCPY operations
Add dma_src, dma_dst and dma_len to struct dma_async_tx_descriptor
for storing DMA mapping data and convert core DMA engine code
(dma_async_memcpy_buf_to_buf(), dma_async_memcpy_buf_to_pg() and
dma_async_memcpy_pg_to_pg()) to do DMA unmapping itself using
the ->callback functionality.
Cc: Vinod Koul <vinod.koul@...el.com>
Cc: Tomasz Figa <t.figa@...sung.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@...sung.com>
---
drivers/dma/dmaengine.c | 62 +++++++++++++++++++++++++++++++++++++++++------
include/linux/dmaengine.h | 6 +++++
2 files changed, 60 insertions(+), 8 deletions(-)
diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
index a815d44..1b9c02a 100644
--- a/drivers/dma/dmaengine.c
+++ b/drivers/dma/dmaengine.c
@@ -853,6 +853,15 @@ void dma_async_device_unregister(struct dma_device *device)
}
EXPORT_SYMBOL(dma_async_device_unregister);
+static void dma_async_memcpy_buf_to_buf_cb(void *dma_async_param)
+{
+ struct dma_async_tx_descriptor *tx = dma_async_param;
+ struct dma_device *dev = tx->chan->device;
+
+ dma_unmap_single(dev->dev, tx->dma_src, tx->dma_len, DMA_TO_DEVICE);
+ dma_unmap_single(dev->dev, tx->dma_dst, tx->dma_len, DMA_FROM_DEVICE);
+}
+
/**
* dma_async_memcpy_buf_to_buf - offloaded copy between virtual addresses
* @chan: DMA channel to offload copy to
@@ -877,9 +886,8 @@ dma_async_memcpy_buf_to_buf(struct dma_chan *chan, void *dest,
dma_src = dma_map_single(dev->dev, src, len, DMA_TO_DEVICE);
dma_dest = dma_map_single(dev->dev, dest, len, DMA_FROM_DEVICE);
- flags = DMA_CTRL_ACK |
- DMA_COMPL_SRC_UNMAP_SINGLE |
- DMA_COMPL_DEST_UNMAP_SINGLE;
+ flags = DMA_CTRL_ACK | DMA_COMPL_SKIP_SRC_UNMAP |
+ DMA_COMPL_SKIP_DEST_UNMAP;
tx = dev->device_prep_dma_memcpy(chan, dma_dest, dma_src, len, flags);
if (!tx) {
@@ -888,7 +896,13 @@ dma_async_memcpy_buf_to_buf(struct dma_chan *chan, void *dest,
return -ENOMEM;
}
- tx->callback = NULL;
+ tx->dma_src = dma_src;
+ tx->dma_dst = dma_dest;
+ tx->dma_len = len;
+
+ tx->callback = dma_async_memcpy_buf_to_buf_cb;
+ tx->callback_param = tx;
+
cookie = tx->tx_submit(tx);
preempt_disable();
@@ -900,6 +914,15 @@ dma_async_memcpy_buf_to_buf(struct dma_chan *chan, void *dest,
}
EXPORT_SYMBOL(dma_async_memcpy_buf_to_buf);
+static void dma_async_memcpy_buf_to_pg_cb(void *dma_async_param)
+{
+ struct dma_async_tx_descriptor *tx = dma_async_param;
+ struct dma_device *dev = tx->chan->device;
+
+ dma_unmap_single(dev->dev, tx->dma_src, tx->dma_len, DMA_TO_DEVICE);
+ dma_unmap_page(dev->dev, tx->dma_dst, tx->dma_len, DMA_FROM_DEVICE);
+}
+
/**
* dma_async_memcpy_buf_to_pg - offloaded copy from address to page
* @chan: DMA channel to offload copy to
@@ -925,7 +948,8 @@ dma_async_memcpy_buf_to_pg(struct dma_chan *chan, struct page *page,
dma_src = dma_map_single(dev->dev, kdata, len, DMA_TO_DEVICE);
dma_dest = dma_map_page(dev->dev, page, offset, len, DMA_FROM_DEVICE);
- flags = DMA_CTRL_ACK | DMA_COMPL_SRC_UNMAP_SINGLE;
+ flags = DMA_CTRL_ACK | DMA_COMPL_SKIP_SRC_UNMAP |
+ DMA_COMPL_SKIP_DEST_UNMAP;
tx = dev->device_prep_dma_memcpy(chan, dma_dest, dma_src, len, flags);
if (!tx) {
@@ -934,7 +958,13 @@ dma_async_memcpy_buf_to_pg(struct dma_chan *chan, struct page *page,
return -ENOMEM;
}
- tx->callback = NULL;
+ tx->dma_src = dma_src;
+ tx->dma_dst = dma_dest;
+ tx->dma_len = len;
+
+ tx->callback = dma_async_memcpy_buf_to_pg_cb;
+ tx->callback_param = tx;
+
cookie = tx->tx_submit(tx);
preempt_disable();
@@ -946,6 +976,15 @@ dma_async_memcpy_buf_to_pg(struct dma_chan *chan, struct page *page,
}
EXPORT_SYMBOL(dma_async_memcpy_buf_to_pg);
+static void dma_async_memcpy_pg_to_pg_cb(void *dma_async_param)
+{
+ struct dma_async_tx_descriptor *tx = dma_async_param;
+ struct dma_device *dev = tx->chan->device;
+
+ dma_unmap_page(dev->dev, tx->dma_src, tx->dma_len, DMA_TO_DEVICE);
+ dma_unmap_page(dev->dev, tx->dma_dst, tx->dma_len, DMA_FROM_DEVICE);
+}
+
/**
* dma_async_memcpy_pg_to_pg - offloaded copy from page to page
* @chan: DMA channel to offload copy to
@@ -974,7 +1013,8 @@ dma_async_memcpy_pg_to_pg(struct dma_chan *chan, struct page *dest_pg,
dma_src = dma_map_page(dev->dev, src_pg, src_off, len, DMA_TO_DEVICE);
dma_dest = dma_map_page(dev->dev, dest_pg, dest_off, len,
DMA_FROM_DEVICE);
- flags = DMA_CTRL_ACK;
+ flags = DMA_CTRL_ACK | DMA_COMPL_SKIP_SRC_UNMAP |
+ DMA_COMPL_SKIP_DEST_UNMAP;
tx = dev->device_prep_dma_memcpy(chan, dma_dest, dma_src, len, flags);
if (!tx) {
@@ -983,7 +1023,13 @@ dma_async_memcpy_pg_to_pg(struct dma_chan *chan, struct page *dest_pg,
return -ENOMEM;
}
- tx->callback = NULL;
+ tx->dma_src = dma_src;
+ tx->dma_dst = dma_dest;
+ tx->dma_len = len;
+
+ tx->callback = dma_async_memcpy_pg_to_pg_cb;
+ tx->callback_param = tx;
+
cookie = tx->tx_submit(tx);
preempt_disable();
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index d3201e4..8741d57 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -402,6 +402,9 @@ typedef void (*dma_async_tx_callback)(void *dma_async_param);
* @phys: physical address of the descriptor
* @chan: target channel for this operation
* @tx_submit: set the prepared descriptor(s) to be executed by the engine
+ * @dma_src: DMA source address (needed for DMA unmap)
+ * @dma_dst: DMA destination address (needed for DMA unmap)
+ * @dma_len: DMA length (needed for DMA unmap)
* @callback: routine to call after this operation is complete
* @callback_param: general parameter to pass to the callback routine
* ---async_tx api specific fields---
@@ -415,6 +418,9 @@ struct dma_async_tx_descriptor {
dma_addr_t phys;
struct dma_chan *chan;
dma_cookie_t (*tx_submit)(struct dma_async_tx_descriptor *tx);
+ dma_addr_t dma_src;
+ dma_addr_t dma_dst;
+ size_t dma_len;
dma_async_tx_callback callback;
void *callback_param;
#ifdef CONFIG_ASYNC_TX_ENABLE_CHANNEL_SWITCH
--
1.8.0
--
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