diff options
Diffstat (limited to 'arch/powerpc/kernel/dma.c')
| -rw-r--r-- | arch/powerpc/kernel/dma.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/dma.c b/arch/powerpc/kernel/dma.c index 4f0959fbfbee..503093efa202 100644 --- a/arch/powerpc/kernel/dma.c +++ b/arch/powerpc/kernel/dma.c @@ -170,6 +170,45 @@ int dma_set_mask(struct device *dev, u64 dma_mask) } EXPORT_SYMBOL(dma_set_mask); +u64 dma_get_required_mask(struct device *dev) +{ + struct dma_map_ops *dma_ops = get_dma_ops(dev); + u64 mask, end = 0; + + if (ppc_md.dma_get_required_mask) + return ppc_md.dma_get_required_mask(dev); + + if (unlikely(dma_ops == NULL)) + return 0; + +#ifdef CONFIG_PPC64 + else if (dma_ops == &dma_iommu_ops) + return dma_iommu_get_required_mask(dev); +#endif +#ifdef CONFIG_SWIOTLB + else if (dma_ops == &swiotlb_dma_ops) { + u64 max_direct_dma_addr = dev->archdata.max_direct_dma_addr; + + end = memblock_end_of_DRAM(); + if (max_direct_dma_addr && end > max_direct_dma_addr) + end = max_direct_dma_addr; + end += get_dma_offset(dev); + } +#endif + else if (dma_ops == &dma_direct_ops) + end = memblock_end_of_DRAM() + get_dma_offset(dev); + else { + WARN_ONCE(1, "%s: unknown ops %p\n", __func__, dma_ops); + end = memblock_end_of_DRAM(); + } + + mask = 1ULL << (fls64(end) - 1); + mask += mask - 1; + + return mask; +} +EXPORT_SYMBOL_GPL(dma_get_required_mask); + static int __init dma_init(void) { dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES); |