[PATCH 1/4] dma: add dma_get_required_mask_from_max_pfn()

From: David Vrabel
Date: Fri Dec 05 2014 - 09:09:16 EST


A generic dma_get_required_mask() is useful even for architectures (such
as ia64) that define ARCH_HAS_GET_REQUIRED_MASK.

Signed-off-by: David Vrabel <david.vrabel@xxxxxxxxxx>
Reviewed-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
---
drivers/base/platform.c | 10 ++++++++--
include/linux/dma-mapping.h | 1 +
2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index b2afc29..f9f3930 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -1009,8 +1009,7 @@ int __init platform_bus_init(void)
return error;
}

-#ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK
-u64 dma_get_required_mask(struct device *dev)
+u64 dma_get_required_mask_from_max_pfn(struct device *dev)
{
u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT);
u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT));
@@ -1028,6 +1027,13 @@ u64 dma_get_required_mask(struct device *dev)
}
return mask;
}
+EXPORT_SYMBOL_GPL(dma_get_required_mask_from_max_pfn);
+
+#ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK
+u64 dma_get_required_mask(struct device *dev)
+{
+ return dma_get_required_mask_from_max_pfn(dev);
+}
EXPORT_SYMBOL_GPL(dma_get_required_mask);
#endif

diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index d5d3881..6e2fdfc 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -127,6 +127,7 @@ static inline int dma_coerce_mask_and_coherent(struct device *dev, u64 mask)
return dma_set_mask_and_coherent(dev, mask);
}

+extern u64 dma_get_required_mask_from_max_pfn(struct device *dev);
extern u64 dma_get_required_mask(struct device *dev);

#ifndef set_arch_dma_coherent_ops
--
1.7.10.4

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