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Subject[PATCH v2 10/14] arm: dma-mapping: Invoke dma offset func if needed
Date
Just like dma_pfn_offset, another offset is added to the dma/phys
translation if there happen to be multiple regions that have different
mapping offsets.

Signed-off-by: Jim Quinlan <james.quinlan@broadcom.com>
---
arch/arm/include/asm/dma-mapping.h | 13 ++++++++++---
1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/arch/arm/include/asm/dma-mapping.h b/arch/arm/include/asm/dma-mapping.h
index bdd80ddbca34..811389b4fb29 100644
--- a/arch/arm/include/asm/dma-mapping.h
+++ b/arch/arm/include/asm/dma-mapping.h
@@ -35,8 +35,12 @@ static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
#ifndef __arch_pfn_to_dma
static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn)
{
- if (dev)
+ if (dev) {
+ /* This should compile out if !CONFIG_DMA_PFN_OFFSET_MAP */
+ pfn -= dma_pfn_offset_from_phys_addr(dev, PFN_PHYS(pfn));
+
pfn -= dev->dma_pfn_offset;
+ }
return (dma_addr_t)__pfn_to_bus(pfn);
}

@@ -44,9 +48,12 @@ static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr)
{
unsigned long pfn = __bus_to_pfn(addr);

- if (dev)
- pfn += dev->dma_pfn_offset;
+ if (dev) {
+ /* This should compile out if !CONFIG_DMA_PFN_OFFSET_MAP */
+ pfn += dma_pfn_offset_from_dma_addr(dev, addr);

+ pfn += dev->dma_pfn_offset;
+ }
return pfn;
}

--
2.17.1
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