On Thursday, December 29, 2016 11:45:03 PM CET Nikita Yushchenko wrote:
quoted hunk ↗ jump to hunk
static int __swiotlb_dma_supported(struct device *hwdev, u64 mask)
{
+#ifdef CONFIG_PCI
+ if (dev_is_pci(hwdev)) {
+ struct pci_dev *pdev = to_pci_dev(hwdev);
+ struct pci_host_bridge *br = pci_find_host_bridge(pdev->bus);
+
+ if (br->dev.dma_mask && (*br->dev.dma_mask) &&
+ (mask & (*br->dev.dma_mask)) != mask)
+ return 0;
+ }
+#endif
if (swiotlb)
return swiotlb_dma_supported(hwdev, mask);
return 1;
I think it's wrong to make this a special case for PCI.
Instead, we should follow the dma-ranges properties during dma_set_mask()
to ensure we don't set a mask that any of the parents up to the root
cannot support.
Arnd