From: Jake Oshins <jakeo@xxxxxxxxxxxxx>
The Linux kernel already has the concept of IRQ domain, wherein a component
can expose a set of IRQs which are managed by a particular interrupt controller
chip or other subsystem. The PCI driver exposes the notion of an IRQ domain
for Message-Signaled Interrupts (MSI) from PCI Express devices. This patch
exposes the functions which are necessary to do this within a module, rather
than just linked into the kernel itself.
I felt it made more sense to deliver an MSI IRQ domain as a module both so that
the code wouldn't be loaded except when needed and also because the driver
which needs this (which is the next patch in this series) is a module and itself
depends on another module.
Signed-off-by: Jake Oshins <jakeo@xxxxxxxxxxxxx>
---
arch/x86/kernel/apic/vector.c | 2 ++
drivers/pci/msi.c | 1 +
kernel/irq/chip.c | 1 +
3 files changed, 4 insertions(+)
diff --git a/arch/x86/kernel/apic/vector.c b/arch/x86/kernel/apic/vector.c
index f47069e..67f7e68 100644
--- a/arch/x86/kernel/apic/vector.c
+++ b/arch/x86/kernel/apic/vector.c
@@ -29,6 +29,7 @@ struct apic_chip_data {
};
struct irq_domain *x86_vector_domain;
+EXPORT_SYMBOL_GPL(x86_vector_domain);
static DEFINE_RAW_SPINLOCK(vector_lock);
static cpumask_var_t vector_cpumask;
static struct irq_chip lapic_controller;
@@ -66,6 +67,7 @@ struct irq_cfg *irqd_cfg(struct irq_data *irq_data)
return data ? &data->cfg : NULL;
}
+EXPORT_SYMBOL_GPL(irqd_cfg);
struct irq_cfg *irq_cfg(unsigned int irq)
{
diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 566de05..b118be1 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -1276,6 +1276,7 @@ struct irq_domain *pci_msi_create_irq_domain(struct device_node *node,
return msi_create_irq_domain(node, info, parent);
}
+EXPORT_SYMBOL_GPL(pci_msi_create_irq_domain);
/**
* pci_msi_domain_alloc_irqs - Allocate interrupts for @dev in @domain
diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index 76f199d..3c82c44 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -935,6 +935,7 @@ void irq_chip_ack_parent(struct irq_data *data)
data = data->parent_data;
data->chip->irq_ack(data);
}
+EXPORT_SYMBOL_GPL(irq_chip_ack_parent);
/**
* irq_chip_mask_parent - Mask the parent interrupt
--
1.9.1
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