[patch RFC 20/38] PCI: vmd: Mark VMD irqdomain with DOMAIN_BUS_VMD_MSI

Thomas Gleixner
2020-08-21T02:17:47Z

[-- Attachment #1: PCI--vmd--Mark-VMD-irqdomain-with-DOMAIN_BUS_VMD_PCI.patch --]
[-- Type: text/plain, Size: 1100 bytes --]

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>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Jonathan Derrick <jonathan.derrick@intel.com>
Cc: linux-pci@vger.kernel.org
---
drivers/pci/controller/vmd.c | 6 ++++++
1 file changed, 6 insertions(+)

--- a/drivers/pci/controller/vmd.c
+++ b/drivers/pci/controller/vmd.c
@@ -579,6 +579,12 @@ 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]);