diff options
Diffstat (limited to 'arch/tile/kernel/pci-dma.c')
| -rw-r--r-- | arch/tile/kernel/pci-dma.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/arch/tile/kernel/pci-dma.c b/arch/tile/kernel/pci-dma.c index 09b58703a..b6bc0547a 100644 --- a/arch/tile/kernel/pci-dma.c +++ b/arch/tile/kernel/pci-dma.c @@ -583,6 +583,35 @@ struct dma_map_ops *gx_hybrid_pci_dma_map_ops; EXPORT_SYMBOL(gx_legacy_pci_dma_map_ops); EXPORT_SYMBOL(gx_hybrid_pci_dma_map_ops); +int dma_set_mask(struct device *dev, u64 mask) +{ + struct dma_map_ops *dma_ops = get_dma_ops(dev); + + /* + * For PCI devices with 64-bit DMA addressing capability, promote + * the dma_ops to hybrid, with the consistent memory DMA space limited + * to 32-bit. For 32-bit capable devices, limit the streaming DMA + * address range to max_direct_dma_addr. + */ + if (dma_ops == gx_pci_dma_map_ops || + dma_ops == gx_hybrid_pci_dma_map_ops || + dma_ops == gx_legacy_pci_dma_map_ops) { + if (mask == DMA_BIT_MASK(64) && + dma_ops == gx_legacy_pci_dma_map_ops) + set_dma_ops(dev, gx_hybrid_pci_dma_map_ops); + else if (mask > dev->archdata.max_direct_dma_addr) + mask = dev->archdata.max_direct_dma_addr; + } + + if (!dev->dma_mask || !dma_supported(dev, mask)) + return -EIO; + + *dev->dma_mask = mask; + + return 0; +} +EXPORT_SYMBOL(dma_set_mask); + #ifdef CONFIG_ARCH_HAS_DMA_SET_COHERENT_MASK int dma_set_coherent_mask(struct device *dev, u64 mask) { |