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[PATCH v9 5/7] PCI: irqdomain: Look up IRQ domain by fwnode_handle

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From: Jake Oshins <jakeo@microsoft.com>

This patch adds a second way of finding an IRQ domain associated with
a root PCI bus.  After looking to see if one can be found through
the OF tree, it attempts to look up the IRQ domain through an
fwnode_handle stored in the pci_sysdata struct.

Signed-off-by: Jake Oshins <jakeo@microsoft.com>
---
 drivers/pci/probe.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 750f907..c6369dd 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -674,6 +674,20 @@ static struct irq_domain *pci_host_bridge_msi_domain(struct pci_bus *bus)
 	 */
 	d = pci_host_bridge_of_msi_domain(bus);
 
+#ifdef CONFIG_PCI_MSI_IRQ_DOMAIN
+	/*
+	 * If no IRQ domain was found via the OF tree, try looking it up
+	 * directly through the fwnode_handle.
+	 */
+	if (!d) {
+		struct fwnode_handle *fwnode = pci_root_bus_fwnode(bus);
+
+		if (fwnode)
+			d = irq_find_matching_fwnode(fwnode,
+						     DOMAIN_BUS_PCI_MSI);
+	}
+#endif
+
 	return d;
 }
 
-- 
1.9.1

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[PATCH v9 0/7] PCI: hv: New paravirtual PCI front-end for Hyper-V VMs jakeo@microsoft.com - 2015-12-10 00:00 +0100
  [PATCH v9 3/7] PCI: Make it possible to implement a PCI MSI IRQ Domain in a module. jakeo@microsoft.com - 2015-12-10 00:00 +0100
  [PATCH v9 4/7] PCI: Add fwnode_handle to pci_sysdata jakeo@microsoft.com - 2015-12-10 00:00 +0100
  [PATCH v9 1/7] drivers:hv: Export a function that maps Linux CPU num onto Hyper-V proc num jakeo@microsoft.com - 2015-12-10 00:00 +0100
  [PATCH v9 5/7] PCI: irqdomain: Look up IRQ domain by fwnode_handle jakeo@microsoft.com - 2015-12-10 00:00 +0100
  [PATCH v9 2/7] drivers:hv: Export hv_do_hypercall() jakeo@microsoft.com - 2015-12-10 00:00 +0100
  [PATCH v9 6/7] drivers:hv: Define the channel type of Hyper-V PCI Express pass-through jakeo@microsoft.com - 2015-12-10 00:00 +0100

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