linux-kernel - [PATCH 2/4]: Change msi to support the Mbigen interrupt

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Message-ID: <55692C2D.50005@huawei.com>
Date:	Sat, 30 May 2015 11:19:09 +0800
From:	"majun (F)" <majun258@...wei.com>
To:	catalin Marinas <Catalin.Marinas@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	Will Deacon <Will.Deacon@....com>,
	Mark Rutland <mark.rutland@....com>,
	Marc Zyngier <marc.zyngier@....com>
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@...wei.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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