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irqchip/gicv3-its: Cleanup for ITS domain initialization 

There is no point to initialize ITS without having msi-controller
property in corresponding DT node. However, its_probe is checking
msi-controller presence at the end, so we can save our time and do that
check prior to its_probe call. Also, for the code clarity purpose,
we put domain initialization to separate function.

Signed-off-by: Tomasz Nowicki <tn@semihalf.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Reviewed-by: Hanjun Guo <hanjun.guo@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Tomasz Nowicki 2016-09-12 20:32:23 +02:00 committed by Marc Zyngier
parent be2021baee
commit d14ae5e6ba
1 changed files with 34 additions and 23 deletions
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57
drivers/irqchip/irq-gic-v3-its.c
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@ -1614,13 +1614,37 @@ static void its_enable_quirks(struct its_node *its)
gic_enable_quirks(iidr, its_quirks, its);
}
static int its_init_domain(struct device_node *node, struct its_node *its,
struct irq_domain *parent)
{
struct irq_domain *inner_domain;
struct msi_domain_info *info;
info = kzalloc(sizeof(*info), GFP_KERNEL);
if (!info)
return -ENOMEM;
inner_domain = irq_domain_add_tree(node, &its_domain_ops, its);
if (!inner_domain) {
kfree(info);
return -ENOMEM;
}
inner_domain->parent = parent;
inner_domain->bus_token = DOMAIN_BUS_NEXUS;
info->ops = &its_msi_domain_ops;
info->data = its;
inner_domain->host_data = info;
return 0;
}
static int __init its_probe(struct device_node *node,
struct irq_domain *parent)
{
struct resource res;
struct its_node *its;
void __iomem *its_base;
struct irq_domain *inner_domain;
u32 val;
u64 baser, tmp;
int err;
@ -1712,28 +1736,9 @@ static int __init its_probe(struct device_node *node,
writeq_relaxed(0, its->base + GITS_CWRITER);
writel_relaxed(GITS_CTLR_ENABLE, its->base + GITS_CTLR);
if (of_property_read_bool(node, "msi-controller")) {
struct msi_domain_info *info;
info = kzalloc(sizeof(*info), GFP_KERNEL);
if (!info) {
err = -ENOMEM;
goto out_free_tables;
}
inner_domain = irq_domain_add_tree(node, &its_domain_ops, its);
if (!inner_domain) {
err = -ENOMEM;
kfree(info);
goto out_free_tables;
}
inner_domain->parent = parent;
inner_domain->bus_token = DOMAIN_BUS_NEXUS;
info->ops = &its_msi_domain_ops;
info->data = its;
inner_domain->host_data = info;
}
err = its_init_domain(node, its, parent);
if (err)
goto out_free_tables;
spin_lock(&its_lock);
list_add(&its->entry, &its_nodes);
@ -1784,6 +1789,12 @@ int __init its_init(struct device_node *node, struct rdists *rdists,
for (np = of_find_matching_node(node, its_device_id); np;
np = of_find_matching_node(np, its_device_id)) {
if (!of_property_read_bool(np, "msi-controller")) {
pr_warn("%s: no msi-controller property, ITS ignored\n",
np->full_name);
continue;
}
its_probe(np, parent_domain);
}