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Commit c8f3e518 authored by Jake Oshins's avatar Jake Oshins Committed by Thomas Gleixner
Browse files

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: default avatarJake 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: default avatarThomas Gleixner <tglx@linutronix.de>
parent 9f318e3f

arch/x86/include/asm/msi.h

+6 −0
Original line number Diff line number Diff line 
#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 */

arch/x86/kernel/apic/msi.c

+5 −3
Original line number Diff line number Diff line
@@ -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,

arch/x86/kernel/apic/vector.c

+2 −0
Original line number Diff line number Diff line
@@ -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)

{