Commit a4289dc2 authored by Jake Oshins's avatar Jake Oshins Committed by Thomas Gleixner
Browse files

genirq/msi: 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 4e8dbe9e

drivers/pci/msi.c

+4 −0
Original line number Diff line number Diff line
@@ -257,6 +257,7 @@ void pci_msi_mask_irq(struct irq_data *data) 
{

	msi_set_mask_bit(data, 1);

}

EXPORT_SYMBOL_GPL(pci_msi_mask_irq);



/**

 * pci_msi_unmask_irq - Generic irq chip callback to unmask PCI/MSI interrupts
@@ -266,6 +267,7 @@ void pci_msi_unmask_irq(struct irq_data *data) 
{

	msi_set_mask_bit(data, 0);

}

EXPORT_SYMBOL_GPL(pci_msi_unmask_irq);



void default_restore_msi_irqs(struct pci_dev *dev)

{
@@ -1126,6 +1128,7 @@ 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)

{
@@ -1285,6 +1288,7 @@ struct irq_domain *pci_msi_create_irq_domain(struct fwnode_handle *fwnode, 
	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

kernel/irq/chip.c

+1 −0
Original line number Diff line number Diff line
@@ -950,6 +950,7 @@ 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

kernel/irq/irqdomain.c

+4 −0
Original line number Diff line number Diff line
@@ -60,6 +60,7 @@ struct fwnode_handle *irq_domain_alloc_fwnode(void *data) 
	fwid->fwnode.type = FWNODE_IRQCHIP;

	return &fwid->fwnode;

}

EXPORT_SYMBOL_GPL(irq_domain_alloc_fwnode);



/**

 * irq_domain_free_fwnode - Free a non-OF-backed fwnode_handle
@@ -77,6 +78,7 @@ void irq_domain_free_fwnode(struct fwnode_handle *fwnode) 
	kfree(fwid->name);

	kfree(fwid);

}

EXPORT_SYMBOL_GPL(irq_domain_free_fwnode);



/**

 * __irq_domain_add() - Allocate a new irq_domain data structure
@@ -1013,6 +1015,7 @@ struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain, 


	return NULL;

}

EXPORT_SYMBOL_GPL(irq_domain_get_irq_data);



/**

 * irq_domain_set_hwirq_and_chip - Set hwirq and irqchip of @virq at @domain
@@ -1343,6 +1346,7 @@ struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain, 


	return (irq_data && irq_data->domain == domain) ? irq_data : NULL;

}

EXPORT_SYMBOL_GPL(irq_domain_get_irq_data);



/**

 * irq_domain_set_info - Set the complete data for a @virq in @domain

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