In order to populate the PHB msi_domain, use the "msi-parent"
attribute to lookup a corresponding irq domain. If found,
this is our MSI domain.
This gets plugged into the core PCI code.
Signed-off-by: Marc Zyngier <marc.zyngier@xxxxxxx>
---
drivers/pci/of.c | 19 +++++++++++++++++++
drivers/pci/probe.c | 1 +
include/linux/pci.h | 2 ++
3 files changed, 22 insertions(+)
diff --git a/drivers/pci/of.c b/drivers/pci/of.c
index f092993..09df465 100644
--- a/drivers/pci/of.c
+++ b/drivers/pci/of.c
@@ -9,6 +9,7 @@
* 2 of the License, or (at your option) any later version.
*/
+#include <linux/irqdomain.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/of.h>
@@ -59,3 +60,21 @@ struct device_node * __weak pcibios_get_phb_of_node(struct pci_bus *bus)
return of_node_get(bus->bridge->parent->of_node);
return NULL;
}
+
+void pci_set_phb_of_msi_domain(struct pci_bus *bus)
+{
+#ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
+ struct device_node *np;
+ struct irq_domain *d;
+
+ if (!bus->dev.of_node)
+ return;
+ np = of_parse_phandle(bus->dev.of_node, "msi-parent", 0);
+ if (!np)
+ return;
+ d = irq_find_matching_host(np, DOMAIN_BUS_PCI_MSI);
+ if (!d)
+ d = irq_find_host(np);
+ dev_set_msi_domain(&bus->dev, d);
+#endif
+}
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 376f6fa..c80626f 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -663,6 +663,7 @@ static void pci_set_bus_speed(struct pci_bus *bus)
void __weak pcibios_set_host_bridge_msi_domain(struct pci_bus *bus)
{
+ pci_set_phb_of_msi_domain(bus);
}
static void pci_set_bus_msi_domain(struct pci_bus *bus)
diff --git a/include/linux/pci.h b/include/linux/pci.h
index fe0825f..b3ad3d4 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1846,6 +1846,7 @@ void pci_set_of_node(struct pci_dev *dev);
void pci_release_of_node(struct pci_dev *dev);
void pci_set_bus_of_node(struct pci_bus *bus);
void pci_release_bus_of_node(struct pci_bus *bus);
+void pci_set_phb_of_msi_domain(struct pci_bus *bus);
/* Arch may override this (weak) */
struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus);
@@ -1868,6 +1869,7 @@ static inline void pci_set_bus_of_node(struct pci_bus *bus) { }
static inline void pci_release_bus_of_node(struct pci_bus *bus) { }
static inline struct device_node *
pci_device_to_OF_node(const struct pci_dev *pdev) { return NULL; }
+static inline void pci_set_phb_of_msi_domain(struct pci_bus *bus) { }
#endif /* CONFIG_OF */
#ifdef CONFIG_EEH
--
2.1.4
--
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