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Subject[PATCH 03/10] irqchip/irq-gic-v3-its-pci-msi: Remove domain init order dependencies
Date
Use new irq_domain_request_host_*() interface which allows independent
parent and child initialization using an irq domain request handler.
This makes it possible to move its initialization to a later point
during boot. All domains can be initialized in the same initcall level
then.

Signed-off-by: Robert Richter <rrichter@cavium.com>
---
drivers/irqchip/irq-gic-v3-its-pci-msi.c | 66 ++++++++++++++++++--------------
1 file changed, 38 insertions(+), 28 deletions(-)

diff --git a/drivers/irqchip/irq-gic-v3-its-pci-msi.c b/drivers/irqchip/irq-gic-v3-its-pci-msi.c
index 8d6d009d1d58..7d7366d55d34 100644
--- a/drivers/irqchip/irq-gic-v3-its-pci-msi.c
+++ b/drivers/irqchip/irq-gic-v3-its-pci-msi.c
@@ -116,27 +116,50 @@ static struct of_device_id its_device_id[] = {
{},
};

-static int __init its_pci_msi_init_one(struct fwnode_handle *handle,
- const char *name)
+static int __init its_pci_create_irq_domain(struct irq_domain *parent,
+ void *priv)
{
- struct irq_domain *parent;
+ char *name = priv;
+ int err = 0;

- parent = irq_find_matching_fwnode(handle, DOMAIN_BUS_NEXUS);
- if (!parent || !msi_get_domain_info(parent)) {
- pr_err("%s: Unable to locate ITS domain\n", name);
- return -ENXIO;
+ if (!msi_get_domain_info(parent)) {
+ err = -ENODEV;
+ goto out;
}

- if (!pci_msi_create_irq_domain(handle, &its_pci_msi_domain_info,
+ if (!pci_msi_create_irq_domain(parent->fwnode, &its_pci_msi_domain_info,
parent)) {
- pr_err("%s: Unable to create PCI domain\n", name);
- return -ENOMEM;
+ err = -ENOMEM;
+ goto out;
}

- return 0;
+ pr_info("PCI/MSI: %s domain created\n", name);
+out:
+ if (err)
+ pr_err("PCI/MSI: Failed to create %s domain: %d\n", name, err);
+
+ kfree(name);
+ return err;
+}
+
+static int __init its_pci_msi_init_one(struct fwnode_handle *handle,
+ const char *name)
+{
+ void *priv = kstrdup(name, GFP_KERNEL);
+ int err;
+
+ err = irq_domain_request_fwnode(handle, DOMAIN_BUS_NEXUS,
+ its_pci_create_irq_domain, name, priv);
+ if (err) {
+ pr_err("PCI/MSI: Failed to register %s domain: %d\n",
+ name, err);
+ kfree(priv);
+ }
+
+ return err;
}

-static int __init its_pci_of_msi_init(void)
+static void __init its_pci_of_msi_init(void)
{
struct device_node *np;

@@ -147,13 +170,8 @@ static int __init its_pci_of_msi_init(void)
if (!of_property_read_bool(np, "msi-controller"))
continue;

- if (its_pci_msi_init_one(of_node_to_fwnode(np), np->full_name))
- continue;
-
- pr_info("PCI/MSI: %pOF domain created\n", np);
+ its_pci_msi_init_one(of_node_to_fwnode(np), np->full_name);
}
-
- return 0;
}

#ifdef CONFIG_ACPI
@@ -177,32 +195,24 @@ its_pci_msi_parse_madt(struct acpi_subtable_header *header,
}

err = its_pci_msi_init_one(dom_handle, node_name);
- if (!err)
- pr_info("PCI/MSI: %s domain created\n", node_name);
-
out:
kfree(node_name);
return err;
}

-static int __init its_pci_acpi_msi_init(void)
+static void __init its_pci_acpi_msi_init(void)
{
acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_TRANSLATOR,
its_pci_msi_parse_madt, 0);
- return 0;
}
#else
-static int __init its_pci_acpi_msi_init(void)
-{
- return 0;
-}
+static void __init its_pci_acpi_msi_init(void) { }
#endif

static int __init its_pci_msi_init(void)
{
its_pci_of_msi_init();
its_pci_acpi_msi_init();
-
return 0;
}
early_initcall(its_pci_msi_init);
--
2.11.0
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