PCI/MSI: Allow the MSI domain to be device-specific
So far, we've always considered that for a given PCI device, its
MSI controller was either set by the architecture-specific
pcibios hook, or simply inherited from the host bridge.
This doesn't cover things like firmware-defined topologies like
msi-map (DT) or IORT (ACPI), which can provide information about
which MSI controller to use on a per-device basis.
This patch adds the necessary hook into the MSI code to allow this
feature, and provides the msi-map functionnality as a first
implementation.
Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 7c333f8..f14a970 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -1639,6 +1639,14 @@
if (d)
return d;
+ /*
+ * Let's see if we have a firmware interface able to provide
+ * the domain.
+ */
+ d = pci_msi_get_device_domain(dev);
+ if (d)
+ return d;
+
return NULL;
}