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Subject[PATCH v5 04/19] PCI/MSI: Add hooks to populate the msi_domain field
Date
In order to be able to populate the device msi_domain field,
add the necessary hooks to propagate the host bridge msi_domain
across secondary busses to devices.

So far, nobody populates the initial msi_domain.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
---
drivers/pci/probe.c | 42 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 42 insertions(+)

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index cefd636..2fd4f8e 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -661,6 +661,32 @@ static void pci_set_bus_speed(struct pci_bus *bus)
}
}

+static struct irq_domain *pci_host_bridge_msi_domain(struct pci_bus *bus)
+{
+ /*
+ * Any firmware interface that can resolve the msi_domain
+ * should be called from here.
+ */
+
+ return NULL;
+}
+
+static void pci_set_bus_msi_domain(struct pci_bus *bus)
+{
+ struct irq_domain *d;
+
+ /*
+ * Either bus is the root, and we must obtain it from the
+ * firmware, or we inherit it from the bridge device.
+ */
+ if (pci_is_root_bus(bus))
+ d = pci_host_bridge_msi_domain(bus);
+ else
+ d = dev_get_msi_domain(&bus->self->dev);
+
+ dev_set_msi_domain(&bus->dev, d);
+}
+
static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent,
struct pci_dev *bridge, int busnr)
{
@@ -714,6 +740,7 @@ static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent,
bridge->subordinate = child;

add_dev:
+ pci_set_bus_msi_domain(child);
ret = device_register(&child->dev);
WARN_ON(ret < 0);

@@ -1544,6 +1571,17 @@ static void pci_init_capabilities(struct pci_dev *dev)
pci_enable_acs(dev);
}

+static void pci_set_msi_domain(struct pci_dev *dev)
+{
+ /*
+ * If no domain has been set through the pcibios callback,
+ * inherit the default from the bus device.
+ */
+ if (!dev_get_msi_domain(&dev->dev))
+ dev_set_msi_domain(&dev->dev,
+ dev_get_msi_domain(&dev->bus->dev));
+}
+
void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
{
int ret;
@@ -1585,6 +1623,9 @@ void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
ret = pcibios_add_device(dev);
WARN_ON(ret < 0);

+ /* Setup MSI irq domain */
+ pci_set_msi_domain(dev);
+
/* Notifier could use PCI capabilities */
dev->match_driver = false;
ret = device_add(&dev->dev);
@@ -1975,6 +2016,7 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
b->bridge = get_device(&bridge->dev);
device_enable_async_suspend(b->bridge);
pci_set_bus_of_node(b);
+ pci_set_bus_msi_domain(b);

if (!parent)
set_dev_node(b->bridge, pcibus_to_node(b));
--
2.1.4


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