openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

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@microsoft.com>
Cc: gregkh@linuxfoundation.org
Cc: kys@microsoft.com
Cc: devel@linuxdriverproject.org
Cc: olaf@aepfle.de
Cc: apw@canonical.com
Cc: vkuznets@redhat.com
Cc: haiyangz@microsoft.com
Cc: marc.zyngier@arm.com
Cc: bhelgaas@google.com
Link: http://lkml.kernel.org/r/1449769983-12948-4-git-send-email-jakeo@microsoft.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Jake Oshins 2015-12-10 17:52:59 +00:00 committed by Thomas Gleixner
parent 9f318e3fcb
commit c8f3e518d3
3 changed files with 13 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
arch/x86/include/asm/msi.h
View File

@ -1,7 +1,13 @@
#ifndef _ASM_X86_MSI_H #ifndef _ASM_X86_MSI_H
#define _ASM_X86_MSI_H #define _ASM_X86_MSI_H
#include <asm/hw_irq.h> #include <asm/hw_irq.h>
#include <asm/irqdomain.h>
typedef struct irq_alloc_info msi_alloc_info_t; 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 */ #endif /* _ASM_X86_MSI_H */

8
arch/x86/kernel/apic/msi.c
View File

@ -96,8 +96,8 @@ static irq_hw_number_t pci_msi_get_hwirq(struct msi_domain_info *info,
return arg->msi_hwirq; return arg->msi_hwirq;
} }
static int pci_msi_prepare(struct irq_domain *domain, struct device *dev, int pci_msi_prepare(struct irq_domain *domain, struct device *dev, int nvec,
int nvec, msi_alloc_info_t *arg) msi_alloc_info_t *arg)
{ {
struct pci_dev *pdev = to_pci_dev(dev); struct pci_dev *pdev = to_pci_dev(dev);
struct msi_desc *desc = first_pci_msi_entry(pdev); 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; 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); 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 = { static struct msi_domain_ops pci_msi_domain_ops = {
.get_hwirq = pci_msi_get_hwirq, .get_hwirq = pci_msi_get_hwirq,

2
arch/x86/kernel/apic/vector.c
View File

@ -29,6 +29,7 @@ struct apic_chip_data {
}; };
struct irq_domain *x86_vector_domain; struct irq_domain *x86_vector_domain;
EXPORT_SYMBOL_GPL(x86_vector_domain);
static DEFINE_RAW_SPINLOCK(vector_lock); static DEFINE_RAW_SPINLOCK(vector_lock);
static cpumask_var_t vector_cpumask; static cpumask_var_t vector_cpumask;
static struct irq_chip lapic_controller; 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; return data ? &data->cfg : NULL;
} }
EXPORT_SYMBOL_GPL(irqd_cfg);
struct irq_cfg *irq_cfg(unsigned int irq) struct irq_cfg *irq_cfg(unsigned int irq)
{ {