[PATCH V5 3/7] irqchip, GICv3, ITS: Cleanup for ITS domain initialization.

Tomasz Nowicki
2016-05-31T11:20:11Z

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>
---
drivers/irqchip/irq-gic-v3-its.c | 57 ++++++++++++++++++++++++----------------
1 file changed, 34 insertions(+), 23 deletions(-)

diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 6bd881b..cb33c92 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -1463,13 +1463,37 @@ 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;
@@ -1560,28 +1584,9 @@ 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);
@@ -1632,6 +1637,12 @@ 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);
}

--
1.9.1