Commit-ID: 0abce64a55ae44d39b92f8e672736f4f324e610f
Gitweb: http://git.kernel.org/tip/0abce64a55ae44d39b92f8e672736f4f324e610f
Author: Marc Zyngier <marc.zyngier@xxxxxxx>
AuthorDate: Fri, 23 Jun 2017 21:42:57 +0100
Committer: Marc Zyngier <marc.zyngier@xxxxxxx>
CommitDate: Wed, 23 Aug 2017 11:09:14 +0100
genirq: Let irq_set_vcpu_affinity() iterate over hierarchy
When assigning an interrupt to a vcpu, it is not unlikely that
the level of the hierarchy implementing irq_set_vcpu_affinity
is not the top level (think a generic MSI domain on top of a
virtualization aware interrupt controller).
In such a case, let's iterate over the hierarchy until we find
an irqchip implementing it.
Reviewed-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Marc Zyngier <marc.zyngier@xxxxxxx>
---
kernel/irq/manage.c | 14 ++++++++++++--
1 file changed, 12 insertions(+), 2 deletions(-)
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 1d1a5b9..573dc52 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -400,8 +400,18 @@ int irq_set_vcpu_affinity(unsigned int irq, void *vcpu_info)
return -EINVAL;
data = irq_desc_get_irq_data(desc);
- chip = irq_data_get_irq_chip(data);
- if (chip && chip->irq_set_vcpu_affinity)
+ do {
+ chip = irq_data_get_irq_chip(data);
+ if (chip && chip->irq_set_vcpu_affinity)
+ break;
+#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
+ data = data->parent_data;
+#else
+ data = NULL;
+#endif
+ } while (data);
+
+ if (data)
ret = chip->irq_set_vcpu_affinity(data, vcpu_info);
irq_put_desc_unlock(desc, flags);
--
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