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authorMarc Zyngier <marc.zyngier@arm.com>2015-11-23 08:26:06 +0000
committerMarc Zyngier <marc.zyngier@arm.com>2015-12-16 15:29:44 +0000
commit2145ac9310b60c1c11294b7bea10fe154009be1d (patch)
tree8f38f1ae3609004675fbfd55a721d3969f67e670 /kernel/irq
parentb2eba39bcab9d60a6c3b80c7fc2f3dacb77eeaae (diff)
downloadlinux-sh-2145ac9310b60c1c11294b7bea10fe154009be1d.tar.gz
genirq/msi: Add msi_domain_populate_irqs
To be able to allocate interrupts from the MSI layer down, add a new msi_domain_populate_irqs entry point. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'kernel/irq')
-rw-r--r--kernel/irq/msi.c40
1 files changed, 40 insertions, 0 deletions
diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c
index 9a85613d4227..15b249e7c673 100644
--- a/kernel/irq/msi.c
+++ b/kernel/irq/msi.c
@@ -266,6 +266,46 @@ int msi_domain_prepare_irqs(struct irq_domain *domain, struct device *dev,
return ret;
}
+int msi_domain_populate_irqs(struct irq_domain *domain, struct device *dev,
+ int virq, int nvec, msi_alloc_info_t *arg)
+{
+ struct msi_domain_info *info = domain->host_data;
+ struct msi_domain_ops *ops = info->ops;
+ struct msi_desc *desc;
+ int ret = 0;
+
+ for_each_msi_entry(desc, dev) {
+ /* Don't even try the multi-MSI brain damage. */
+ if (WARN_ON(!desc->irq || desc->nvec_used != 1)) {
+ ret = -EINVAL;
+ break;
+ }
+
+ if (!(desc->irq >= virq && desc->irq < (virq + nvec)))
+ continue;
+
+ ops->set_desc(arg, desc);
+ /* Assumes the domain mutex is held! */
+ ret = irq_domain_alloc_irqs_recursive(domain, virq, 1, arg);
+ if (ret)
+ break;
+
+ irq_set_msi_desc_off(virq, 0, desc);
+ }
+
+ if (ret) {
+ /* Mop up the damage */
+ for_each_msi_entry(desc, dev) {
+ if (!(desc->irq >= virq && desc->irq < (virq + nvec)))
+ continue;
+
+ irq_domain_free_irqs_common(domain, desc->irq, 1);
+ }
+ }
+
+ return ret;
+}
+
/**
* msi_domain_alloc_irqs - Allocate interrupts from a MSI interrupt domain
* @domain: The domain to allocate from