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Commit 471036b2 authored by Suravee Suthikulpanit's avatar Suravee Suthikulpanit Committed by Marc Zyngier
Browse files

acpi: pci: Setup MSI domain for ACPI based pci devices 



This patch introduces pci_msi_register_fwnode_provider() for irqchip
to register a callback, to provide a way to determine appropriate MSI
domain for a pci device.

It also introduces pci_host_bridge_acpi_msi_domain(), which returns
the MSI domain of the specified PCI host bridge with DOMAIN_BUS_PCI_MSI
bus token. Then, it is assigned to pci device.

Reviewed-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
Acked-by: default avatarBjorn Helgaas <bhelgaas@google.com>
Acked-by: default avatarRafael J. Wysocki <rjw@rjwysocki.net>
Signed-off-by: default avatarSuravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>
Signed-off-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
parent 9f9499ae

drivers/pci/pci-acpi.c

+42 −0
Original line number Diff line number Diff line
@@ -9,7 +9,9 @@ 


#include <linux/delay.h>

#include <linux/init.h>

#include <linux/irqdomain.h>

#include <linux/pci.h>

#include <linux/msi.h>

#include <linux/pci_hotplug.h>

#include <linux/module.h>

#include <linux/pci-aspm.h>
@@ -689,6 +691,46 @@ static struct acpi_bus_type acpi_pci_bus = { 
	.cleanup = pci_acpi_cleanup,

};





static struct fwnode_handle *(*pci_msi_get_fwnode_cb)(struct device *dev);



/**

 * pci_msi_register_fwnode_provider - Register callback to retrieve fwnode

 * @fn:       Callback matching a device to a fwnode that identifies a PCI

 *            MSI domain.

 *

 * This should be called by irqchip driver, which is the parent of

 * the MSI domain to provide callback interface to query fwnode.

 */

void

pci_msi_register_fwnode_provider(struct fwnode_handle *(*fn)(struct device *))

{

	pci_msi_get_fwnode_cb = fn;

}



/**

 * pci_host_bridge_acpi_msi_domain - Retrieve MSI domain of a PCI host bridge

 * @bus:      The PCI host bridge bus.

 *

 * This function uses the callback function registered by

 * pci_msi_register_fwnode_provider() to retrieve the irq_domain with

 * type DOMAIN_BUS_PCI_MSI of the specified host bridge bus.

 * This returns NULL on error or when the domain is not found.

 */

struct irq_domain *pci_host_bridge_acpi_msi_domain(struct pci_bus *bus)

{

	struct fwnode_handle *fwnode;



	if (!pci_msi_get_fwnode_cb)

		return NULL;



	fwnode = pci_msi_get_fwnode_cb(&bus->dev);

	if (!fwnode)

		return NULL;



	return irq_find_matching_fwnode(fwnode, DOMAIN_BUS_PCI_MSI);

}



static int __init acpi_pci_init(void)

{

	int ret;

drivers/pci/probe.c

+2 −0
Original line number Diff line number Diff line
@@ -672,6 +672,8 @@ static struct irq_domain *pci_host_bridge_msi_domain(struct pci_bus *bus) 
	 * should be called from here.

	 */

	d = pci_host_bridge_of_msi_domain(bus);

	if (!d)

		d = pci_host_bridge_acpi_msi_domain(bus);



	return d;

}

include/linux/irqdomain.h

+5 −0
Original line number Diff line number Diff line
@@ -410,6 +410,11 @@ static inline bool irq_domain_is_hierarchy(struct irq_domain *domain) 
static inline void irq_dispose_mapping(unsigned int virq) { }

static inline void irq_domain_activate_irq(struct irq_data *data) { }

static inline void irq_domain_deactivate_irq(struct irq_data *data) { }

static inline struct irq_domain *irq_find_matching_fwnode(

	struct fwnode_handle *fwnode, enum irq_domain_bus_token bus_token)

{

	return NULL;

}

#endif /* !CONFIG_IRQ_DOMAIN */



#endif /* _LINUX_IRQDOMAIN_H */

include/linux/pci.h

+10 −0
Original line number Diff line number Diff line
@@ -1946,6 +1946,16 @@ static inline struct irq_domain * 
pci_host_bridge_of_msi_domain(struct pci_bus *bus) { return NULL; }

#endif  /* CONFIG_OF */



#ifdef CONFIG_ACPI

struct irq_domain *pci_host_bridge_acpi_msi_domain(struct pci_bus *bus);



void

pci_msi_register_fwnode_provider(struct fwnode_handle *(*fn)(struct device *));

#else

static inline struct irq_domain *

pci_host_bridge_acpi_msi_domain(struct pci_bus *bus) { return NULL; }

#endif



#ifdef CONFIG_EEH

static inline struct eeh_dev *pci_dev_to_eeh_dev(struct pci_dev *pdev)

{