linux-kernel - [PATCH v8 5/7] PCI: irqdomain: Look up IRQ domain by fwnode

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Message-Id: <1449690525-5240-6-git-send-email-jakeo@microsoft.com>
Date:	Wed,  9 Dec 2015 19:48:43 +0000
From:	jakeo@...rosoft.com
To:	gregkh@...uxfoundation.org, kys@...rosoft.com,
	linux-kernel@...r.kernel.org, devel@...uxdriverproject.org,
	olaf@...fle.de, apw@...onical.com, vkuznets@...hat.com,
	tglx@...utronix.de, haiyangz@...rosoft.com, marc.zyngier@....com,
	bhelgaas@...gle.com, linux-pci@...r.kernel.org
Cc:	Jake Oshins <jakeo@...rosoft.com>
Subject: [PATCH v8 5/7] PCI: irqdomain: Look up IRQ domain by fwnode_handle

From: Jake Oshins <jakeo@...rosoft.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@...rosoft.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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