From: Thomas Gleixner <tglx@linutronix.de>
Date: Wed, 26 Aug 2020 13:16:52 +0200
Subject: PCI_vmd_Mark_VMD_irqdomain_with_DOMAIN_BUS_VMD_MSI
Git-commit: d7f954e54079b4bf6088956d59f43768ec71269a
Patch-mainline: v5.10-rc1
References: jsc#SLE-16823

Devices on the VMD bus use their own MSI irq domain, but it is not
distinguishable from regular PCI/MSI irq domains. This is required
to exclude VMD devices from getting the irq domain pointer set by
interrupt remapping.

Override the default bus token.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Joerg Roedel <jroedel@suse.de>
Link: https://lore.kernel.org/r/20200826112333.047315047@linutronix.de
---
 drivers/pci/controller/vmd.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/drivers/pci/controller/vmd.c
+++ b/drivers/pci/controller/vmd.c
@@ -538,6 +538,12 @@ static int vmd_enable_domain(struct vmd_
 		return -ENODEV;
 	}
 
+	/*
+	 * Override the irq domain bus token so the domain can be distinguished
+	 * from a regular PCI/MSI domain.
+	 */
+	irq_domain_update_bus_token(vmd->irq_domain, DOMAIN_BUS_VMD_MSI);
+
 	pci_add_resource(&resources, &vmd->resources[0]);
 	pci_add_resource_offset(&resources, &vmd->resources[1], offset[0]);
 	pci_add_resource_offset(&resources, &vmd->resources[2], offset[1]);