From: Jake Oshins <jakeo@xxxxxxxxxxxxx>
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@xxxxxxxxxxxxx>
---
arch/x86/include/asm/pci.h | 4 +++-
drivers/pci/probe.c | 11 +++++++++++
include/asm-generic/pci.h | 4 ++++
3 files changed, 18 insertions(+), 1 deletion(-)
diff --git a/arch/x86/include/asm/pci.h b/arch/x86/include/asm/pci.h
index 10213a1..fb74453 100644
--- a/arch/x86/include/asm/pci.h
+++ b/arch/x86/include/asm/pci.h
@@ -45,11 +45,13 @@ static inline int pci_proc_domain(struct pci_bus *bus)
#endif
#ifdef CONFIG_PCI_MSI_IRQ_DOMAIN
-static inline void *pci_fwnode(struct pci_bus *bus)
+static inline void *_pci_root_bus_fwnode(struct pci_bus *bus)
{
struct pci_sysdata *sd = bus->sysdata;
return sd->fwnode;
}
+
+#define pci_root_bus_fwnode _pci_root_bus_fwnode
#endif
/* Can be used to override the logic in pci_scan_bus for skipping
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index f441d1b..60e50a8 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -671,6 +671,17 @@ 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 && pci_root_bus_fwnode(bus)) {
+ d = irq_find_matching_fwnode(pci_root_bus_fwnode(bus),
+ DOMAIN_BUS_PCI_MSI);
+ }
+#endif
+
return d;
}
diff --git a/include/asm-generic/pci.h b/include/asm-generic/pci.h
index f24bc51..3fde985 100644
--- a/include/asm-generic/pci.h
+++ b/include/asm-generic/pci.h
@@ -21,4 +21,8 @@ static inline int pci_get_legacy_ide_irq(struct pci_dev *dev, int channel)
#define PCI_DMA_BUS_IS_PHYS (1)
#endif
+#ifndef pci_root_bus_fwnode
+#define pci_root_bus_fwnode(bus) ((void)(bus),NULL)
+#endif
+
#endif /* _ASM_GENERIC_PCI_H */
--
1.9.1
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