Commit 9b4a824b authored by Jon Derrick's avatar Jon Derrick Committed by Lorenzo Pieralisi
Browse files

iommu/vt-d: Use Real PCI DMA device for IRTE 

VMD retransmits child device MSI-X with the VMD endpoint's requester-id.
In order to support direct interrupt remapping of VMD child devices,
ensure that the IRTE is programmed with the VMD endpoint's requester-id
using pci_real_dma_dev().

Link: https://lore.kernel.org/r/20210210161315.316097-2-jonathan.derrick@intel.com


Signed-off-by: default avatarJon Derrick <jonathan.derrick@intel.com>
Signed-off-by: default avatarLorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: default avatarLu Baolu <baolu.lu@linux.intel.com>
Acked-by: default avatarJoerg Roedel <jroedel@suse.de>
parent a38fd874

drivers/iommu/intel/irq_remapping.c

+2 −1
Original line number Diff line number Diff line
@@ -1280,7 +1280,8 @@ static void intel_irq_remapping_prepare_irte(struct intel_ir_data *data, 
		break;

	case X86_IRQ_ALLOC_TYPE_PCI_MSI:

	case X86_IRQ_ALLOC_TYPE_PCI_MSIX:

		set_msi_sid(irte, msi_desc_to_pci_dev(info->desc));

		set_msi_sid(irte,

			    pci_real_dma_dev(msi_desc_to_pci_dev(info->desc)));

		break;

	default:

		BUG_ON(1);