Commit-ID: c8f3e518d3444ee9200a4987421fcee60f768f11
Gitweb: http://git.kernel.org/tip/c8f3e518d3444ee9200a4987421fcee60f768f11
Author: Jake Oshins <jakeo@xxxxxxxxxxxxx>
AuthorDate: Thu, 10 Dec 2015 17:52:59 +0000
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Sun, 20 Dec 2015 12:40:49 +0100
x86/irq: Export functions to allow MSI domains in modules
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 creating a MSI IRQ domain within a module.
[ tglx: Split it into x86 and core irq parts ]
Signed-off-by: Jake Oshins <jakeo@xxxxxxxxxxxxx>
Cc: gregkh@xxxxxxxxxxxxxxxxxxx
Cc: kys@xxxxxxxxxxxxx
Cc: devel@xxxxxxxxxxxxxxxxxxxxxx
Cc: olaf@xxxxxxxxx
Cc: apw@xxxxxxxxxxxxx
Cc: vkuznets@xxxxxxxxxx
Cc: haiyangz@xxxxxxxxxxxxx
Cc: marc.zyngier@xxxxxxx
Cc: bhelgaas@xxxxxxxxxx
Link: http://lkml.kernel.org/r/1449769983-12948-4-git-send-email-jakeo@xxxxxxxxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
arch/x86/include/asm/msi.h | 6 ++++++
arch/x86/kernel/apic/msi.c | 8 +++++---
arch/x86/kernel/apic/vector.c | 2 ++
3 files changed, 13 insertions(+), 3 deletions(-)
diff --git a/arch/x86/include/asm/msi.h b/arch/x86/include/asm/msi.h
index 93724cc..eb4b09b 100644
--- a/arch/x86/include/asm/msi.h
+++ b/arch/x86/include/asm/msi.h
@@ -1,7 +1,13 @@
#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);
+
+void pci_msi_set_desc(msi_alloc_info_t *arg, struct msi_desc *desc);
+
#endif /* _ASM_X86_MSI_H */
diff --git a/arch/x86/kernel/apic/msi.c b/arch/x86/kernel/apic/msi.c
index 5f1feb6..ade2532 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);
@@ -113,11 +113,13 @@ 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)
+void pci_msi_set_desc(msi_alloc_info_t *arg, struct msi_desc *desc)
{
arg->msi_hwirq = pci_msi_domain_calc_hwirq(arg->msi_dev, desc);
}
+EXPORT_SYMBOL_GPL(pci_msi_set_desc);
static struct msi_domain_ops pci_msi_domain_ops = {
.get_hwirq = pci_msi_get_hwirq,
diff --git a/arch/x86/kernel/apic/vector.c b/arch/x86/kernel/apic/vector.c
index 861bc59..908cb37 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)
{
--
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