diff options
Diffstat (limited to 'arch/powerpc/kernel/dma-swiotlb.c')
| -rw-r--r-- | arch/powerpc/kernel/dma-swiotlb.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/dma-swiotlb.c b/arch/powerpc/kernel/dma-swiotlb.c index 4295e0b94b2..1ebc9189aad 100644 --- a/arch/powerpc/kernel/dma-swiotlb.c +++ b/arch/powerpc/kernel/dma-swiotlb.c @@ -24,6 +24,21 @@ unsigned int ppc_swiotlb_enable; +static u64 swiotlb_powerpc_get_required(struct device *dev) +{ + u64 end, mask, 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); + + mask = 1ULL << (fls64(end) - 1); + mask += mask - 1; + + return mask; +} + /* * At the moment, all platforms that use this code only require * swiotlb to be used if we're operating on HIGHMEM. Since @@ -44,6 +59,7 @@ struct dma_map_ops swiotlb_dma_ops = { .sync_sg_for_cpu = swiotlb_sync_sg_for_cpu, .sync_sg_for_device = swiotlb_sync_sg_for_device, .mapping_error = swiotlb_dma_mapping_error, + .get_required_mask = swiotlb_powerpc_get_required, }; void pci_dma_dev_setup_swiotlb(struct pci_dev *pdev) |