diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/kernel/dma_64.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/arch/powerpc/kernel/dma_64.c b/arch/powerpc/kernel/dma_64.c index 4e655119978..1d1dc76606a 100644 --- a/arch/powerpc/kernel/dma_64.c +++ b/arch/powerpc/kernel/dma_64.c @@ -111,7 +111,11 @@ EXPORT_SYMBOL(dma_iommu_ops); /* * Generic direct DMA implementation + * + * This implementation supports a global offset that can be applied if + * the address at which memory is visible to devices is not 0. */ +unsigned long dma_direct_offset; static void *dma_direct_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle, gfp_t flag) @@ -122,7 +126,7 @@ static void *dma_direct_alloc_coherent(struct device *dev, size_t size, ret = (void *)__get_free_pages(flag, get_order(size)); if (ret != NULL) { memset(ret, 0, size); - *dma_handle = virt_to_abs(ret); + *dma_handle = virt_to_abs(ret) | dma_direct_offset; } return ret; } @@ -137,7 +141,7 @@ static dma_addr_t dma_direct_map_single(struct device *dev, void *ptr, size_t size, enum dma_data_direction direction) { - return virt_to_abs(ptr); + return virt_to_abs(ptr) | dma_direct_offset; } static void dma_direct_unmap_single(struct device *dev, dma_addr_t dma_addr, @@ -152,7 +156,8 @@ static int dma_direct_map_sg(struct device *dev, struct scatterlist *sg, int i; for (i = 0; i < nents; i++, sg++) { - sg->dma_address = page_to_phys(sg->page) + sg->offset; + sg->dma_address = (page_to_phys(sg->page) + sg->offset) | + dma_direct_offset; sg->dma_length = sg->length; } |