The PCI device may have a DMA requester on another bus, such as VMD
subdevices needing to use the VMD endpoint. This case requires the real
DMA device when mapping to IOMMU.
Signed-off-by: Jon Derrick <jonathan.derrick@xxxxxxxxx>
---
drivers/iommu/intel-iommu.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 0c8d81f..01a1b0f 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -782,6 +782,8 @@ static struct intel_iommu *device_to_iommu(struct device *dev, u8 *bus, u8 *devf
return NULL;
#endif
+ pdev = pci_real_dma_dev(dev);
+
/* VFs aren't listed in scope tables; we need to look up
* the PF instead to find the IOMMU. */
pf_pdev = pci_physfn(pdev);
@@ -2428,6 +2430,13 @@ static struct dmar_domain *find_domain(struct device *dev)
dev->archdata.iommu == DUMMY_DEVICE_DOMAIN_INFO))
return NULL;
+ if (dev_is_pci(dev)) {
+ struct pci_dev *pdev;
+
+ pdev = pci_real_dma_dev(to_pci_dev(dev));
+ dev = &pdev->dev;
+ }
+
/* No lock here, assumes no domain exit in normal case */
info = dev->archdata.iommu;
if (likely(info))
--
1.8.3.1
