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 for making an MSI IRQ domain within
a module.
The same goal could be accomplished by building an MSI IRQ domain for Hyper-V
into the kernel itself, but this would have required pulling in a lot of other
code which currently exists in modules, and it seemed cleaner to avoid that.
Signed-off-by: Jake Oshins <jakeo@xxxxxxxxxxxxx>
---
arch/x86/include/asm/msi.h | 4 ++++
arch/x86/kernel/apic/msi.c | 5 +++--
arch/x86/kernel/apic/vector.c | 2 ++
drivers/pci/msi.c | 2 ++
kernel/irq/chip.c | 1 +
5 files changed, 12 insertions(+), 2 deletions(-)
diff --git a/arch/x86/include/asm/msi.h b/arch/x86/include/asm/msi.h
index 93724cc..e8b7924 100644
--- a/arch/x86/include/asm/msi.h
+++ b/arch/x86/include/asm/msi.h
@@ -1,7 +1,11 @@
#ifndef _ASM_X86_MSI_H
#define _ASM_X86_MSI_H
#include <asm/hw_irq.h>
+#include <asm/irqdomain.h>
typedef struct irq_alloc_info msi_alloc_info_t;
+int pci_msi_prepare(struct irq_domain *domain, struct device *dev, int nvec,
+ msi_alloc_info_t *arg);
+
#endif /* _ASM_X86_MSI_H */
diff --git a/arch/x86/kernel/apic/msi.c b/arch/x86/kernel/apic/msi.c
index 5f1feb6..bdb28fc 100644
--- a/arch/x86/kernel/apic/msi.c
+++ b/arch/x86/kernel/apic/msi.c
@@ -96,8 +96,8 @@ static irq_hw_number_t pci_msi_get_hwirq(struct msi_domain_info *info,
return arg->msi_hwirq;
}
-static int pci_msi_prepare(struct irq_domain *domain, struct device *dev,
- int nvec, msi_alloc_info_t *arg)
+int pci_msi_prepare(struct irq_domain *domain, struct device *dev, int nvec,
+ msi_alloc_info_t *arg)
{
struct pci_dev *pdev = to_pci_dev(dev);
struct msi_desc *desc = first_pci_msi_entry(pdev);
@@ -113,6 +113,7 @@ static int pci_msi_prepare(struct irq_domain *domain, struct device *dev,
return 0;
}
+EXPORT_SYMBOL_GPL(pci_msi_prepare);
static void pci_msi_set_desc(msi_alloc_info_t *arg, struct msi_desc *desc)
{
diff --git a/arch/x86/kernel/apic/vector.c b/arch/x86/kernel/apic/vector.c
index 1bbd0fe..b16d915 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 c7ad8ce..1aaa26d 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -1119,6 +1119,7 @@ struct pci_dev *msi_desc_to_pci_dev(struct msi_desc *desc)
{
return to_pci_dev(desc->dev);
}
+EXPORT_SYMBOL(msi_desc_to_pci_dev);
void *msi_desc_to_pci_sysdata(struct msi_desc *desc)
{
@@ -1274,6 +1275,7 @@ struct irq_domain *pci_msi_create_irq_domain(struct device_node *node,
domain->bus_token = DOMAIN_BUS_PCI_MSI;
return domain;
}
+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 6e40a95..b0d9ecd 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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