linux-kernel - [PATCH -mm 4/7] dma-mapping.h: add dma_set_coherent

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Date:	Fri, 12 Feb 2010 18:33:29 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	linux-kernel@...r.kernel.org
Cc:	akpm@...ux-foundation.org, fujita.tomonori@....ntt.co.jp,
	James Bottomley <James.Bottomley@...e.de>,
	"David S. Miller" <davem@...emloft.net>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Russell King <linux@....linux.org.uk>
Subject: [PATCH -mm 4/7] dma-mapping.h: add dma_set_coherent_mask

dma_set_coherent_mask corresponds to pci_set_consistent_dma_mask. This
is necessary to move to the generic device model DMA API from the PCI
bus specific API in the long term.

dma_set_coherent_mask works in the exact same way that
pci_set_consistent_dma_mask does. So this patch also changes
pci_set_consistent_dma_mask to call dma_set_coherent_mask.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Cc: James Bottomley <James.Bottomley@...e.de>
Cc: David S. Miller <davem@...emloft.net>
Cc: Jesse Barnes <jbarnes@...tuousgeek.org>
Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc: Russell King <linux@....linux.org.uk>
---
 Documentation/DMA-API.txt   |   10 ++++++++++
 drivers/pci/pci.c           |    7 +++----
 include/linux/dma-mapping.h |    8 ++++++++
 3 files changed, 21 insertions(+), 4 deletions(-)

diff --git a/Documentation/DMA-API.txt b/Documentation/DMA-API.txt
index bd34a62..d7d9eef 100644
--- a/Documentation/DMA-API.txt
+++ b/Documentation/DMA-API.txt
@@ -167,6 +167,16 @@ parameters if it is.
 
 Returns: 0 if successful and a negative error if not.
 
+int
+dma_set_coherent_mask(struct device *dev, u64 mask)
+int
+pci_set_consistent_dma_mask(struct pci_device *dev, u64 mask)
+
+Checks to see if the mask is possible and updates the device
+parameters if it is.
+
+Returns: 0 if successful and a negative error if not.
+
 u64
 dma_get_required_mask(struct device *dev)
 
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 5c881e9..aacb86f 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -2131,12 +2131,11 @@ pci_set_dma_mask(struct pci_dev *dev, u64 mask)
 int
 pci_set_consistent_dma_mask(struct pci_dev *dev, u64 mask)
 {
-	if (!pci_dma_supported(dev, mask))
-		return -EIO;
+	int ret = dma_set_coherent_mask(&dev->dev, mask);
+	if (ret)
+		return ret;
 
-	dev->dev.coherent_dma_mask = mask;
 	dev_dbg(&dev->dev, "using %dbit consistent DMA mask\n", fls64(mask));
-
 	return 0;
 }
 #endif
diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index 86e7dc3..599d8e4 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -127,6 +127,14 @@ static inline u64 dma_get_mask(struct device *dev)
 	return DMA_BIT_MASK(32);
 }
 
+static inline int dma_set_coherent_mask(struct device *dev, u64 mask)
+{
+	if (!dma_supported(dev, mask))
+		return -EIO;
+	dev->coherent_dma_mask = mask;
+	return 0;
+}
+
 extern u64 dma_get_required_mask(struct device *dev);
 
 static inline unsigned int dma_get_max_seg_size(struct device *dev)
-- 
1.5.6.5

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