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Subject[PATCH 2/4]: Change msi to support the Mbigen interrupt
This patch is applied to support the interrupts from Mbigen.

As a interrupt controller, Mbigen is used as a child domain of MSI
domain just like pci device.

Change log:
--add IRQ_DOMAIN_FLAG_MBIGEN to presents the interrupt from mbigen
--add function is_mbigen_domain to check the interrupt domain
--modified irq_chip_write_msi_msg to use the different message write function
for interrupt from mbigen

Signed-off-by: Ma Jun <majun258@huawei.com>
---
include/linux/irqdomain.h | 2 +-
include/linux/msi.h | 1 +
kernel/irq/msi.c | 22 +++++++++++++++++++++-
3 files changed, 23 insertions(+), 2 deletions(-)
mode change 100644 => 100755 include/linux/msi.h
mode change 100644 => 100755 kernel/irq/msi.c

diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h
index 676d730..cb6b33a 100644
--- a/include/linux/irqdomain.h
+++ b/include/linux/irqdomain.h
@@ -136,7 +136,7 @@ enum {

/* Core calls alloc/free recursive through the domain hierarchy. */
IRQ_DOMAIN_FLAG_AUTO_RECURSIVE = (1 << 1),
-
+ IRQ_DOMAIN_FLAG_MBIGEN = (1 << 2),
/*
* Flags starting from IRQ_DOMAIN_FLAG_NONCORE are reserved
* for implementation specific purposes and ignored by the
diff --git a/include/linux/msi.h b/include/linux/msi.h
old mode 100644
new mode 100755
index 8ac4a68..3e2b6c7
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -239,5 +239,6 @@ irq_hw_number_t pci_msi_domain_calc_hwirq(struct pci_dev *dev,
int pci_msi_domain_check_cap(struct irq_domain *domain,
struct msi_domain_info *info, struct device *dev);
#endif /* CONFIG_PCI_MSI_IRQ_DOMAIN */
+bool is_mbigen_domain(struct irq_data *data);

#endif /* LINUX_MSI_H */
diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c
old mode 100644
new mode 100755
index 474de5c..1dba07e
--- a/kernel/irq/msi.c
+++ b/kernel/irq/msi.c
@@ -31,11 +31,31 @@ void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg)
}
EXPORT_SYMBOL_GPL(get_cached_msi_msg);

+bool is_mbigen_domain(struct irq_data *data)
+{
+ int virq;
+ struct irq_domain *domain;
+ struct irq_data *source_irq_data;
+
+ virq = data->irq;
+ source_irq_data = irq_get_irq_data(virq);
+ domain = source_irq_data->domain;
+
+ if (domain->flags & IRQ_DOMAIN_FLAG_MBIGEN)
+ return true;
+ else
+ return false;
+
+}
+
#ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
static inline void irq_chip_write_msi_msg(struct irq_data *data,
struct msi_msg *msg)
{
- data->chip->irq_write_msi_msg(data, msg);
+ if (is_mbigen_domain(data))
+ data->chip->irq_write_mbi_msg(data, msg);
+ else
+ data->chip->irq_write_msi_msg(data, msg);
}

/**
--
1.7.1




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