Commit-ID: b2eba39bcab9d60a6c3b80c7fc2f3dacb77eeaae
Gitweb: http://git.kernel.org/tip/b2eba39bcab9d60a6c3b80c7fc2f3dacb77eeaae
Author: Marc Zyngier <marc.zyngier@xxxxxxx>
AuthorDate: Mon, 23 Nov 2015 08:26:05 +0000
Committer: Marc Zyngier <marc.zyngier@xxxxxxx>
CommitDate: Wed, 16 Dec 2015 15:29:44 +0000
genirq/msi: Make the .prepare callback reusable
The .prepare callbacks are so far only called from msi_domain_alloc_irqs.
In order to reuse that code, split that code and create a
msi_domain_prepare_irqs function that the existing code can call into.
Signed-off-by: Marc Zyngier <marc.zyngier@xxxxxxx>
---
include/linux/msi.h | 4 ++++
kernel/irq/msi.c | 18 +++++++++++++++---
2 files changed, 19 insertions(+), 3 deletions(-)
diff --git a/include/linux/msi.h b/include/linux/msi.h
index f71a25e..1c0bb2c 100644
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -279,6 +279,10 @@ struct irq_domain *platform_msi_create_irq_domain(struct fwnode_handle *fwnode,
int platform_msi_domain_alloc_irqs(struct device *dev, unsigned int nvec,
irq_write_msi_msg_t write_msi_msg);
void platform_msi_domain_free_irqs(struct device *dev);
+
+/* When an MSI domain is used as an intermediate domain */
+int msi_domain_prepare_irqs(struct irq_domain *domain, struct device *dev,
+ int nvec, msi_alloc_info_t *args);
#endif /* CONFIG_GENERIC_MSI_IRQ_DOMAIN */
#ifdef CONFIG_PCI_MSI_IRQ_DOMAIN
diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c
index 6b0c0b7..9a85613 100644
--- a/kernel/irq/msi.c
+++ b/kernel/irq/msi.c
@@ -252,6 +252,20 @@ struct irq_domain *msi_create_irq_domain(struct fwnode_handle *fwnode,
&msi_domain_ops, info);
}
+int msi_domain_prepare_irqs(struct irq_domain *domain, struct device *dev,
+ int nvec, msi_alloc_info_t *arg)
+{
+ struct msi_domain_info *info = domain->host_data;
+ struct msi_domain_ops *ops = info->ops;
+ int ret;
+
+ ret = ops->msi_check(domain, info, dev);
+ if (ret == 0)
+ ret = ops->msi_prepare(domain, dev, nvec, arg);
+
+ return ret;
+}
+
/**
* msi_domain_alloc_irqs - Allocate interrupts from a MSI interrupt domain
* @domain: The domain to allocate from
@@ -270,9 +284,7 @@ int msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev,
struct msi_desc *desc;
int i, ret, virq = -1;
- ret = ops->msi_check(domain, info, dev);
- if (ret == 0)
- ret = ops->msi_prepare(domain, dev, nvec, &arg);
+ ret = msi_domain_prepare_irqs(domain, dev, nvec, &arg);
if (ret)
return ret;
--
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