Commit cd0ec59a authored by Lorenzo Pieralisi's avatar Lorenzo Pieralisi Committed by Marc Zyngier
Browse files

PCI/MSI: Add pci_msi_map_rid_ctlr_node() helper function 



IRQchip drivers need a PCI/MSI function to map a RID to a MSI
controller deviceID namespace and at the same time retrieve the
struct device_node pointer of the MSI controller the RID is mapped
to.

Add pci_msi_map_rid_ctlr_node() to achieve this purpose.

Cc  Bjorn Helgaas <bhelgaas@google.com>

Signed-off-by: default avatarLorenzo Pieralisi <lpieralisi@kernel.org>
Reviewed-by: default avatarMarc Zyngier <maz@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20250703-gicv5-host-v7-25-12e71f1b3528@kernel.org


Signed-off-by: default avatarMarc Zyngier <maz@kernel.org>
parent 31fd3bec

drivers/pci/msi/irqdomain.c

+20 −0
Original line number Diff line number Diff line
@@ -427,6 +427,26 @@ u32 pci_msi_domain_get_msi_rid(struct irq_domain *domain, struct pci_dev *pdev) 
	return rid;

}



/**

 * pci_msi_map_rid_ctlr_node - Get the MSI controller node and MSI requester id (RID)

 * @pdev:	The PCI device

 * @node:	Pointer to store the MSI controller device node

 *

 * Use the firmware data to find the MSI controller node for @pdev.

 * If found map the RID and initialize @node with it. @node value must

 * be set to NULL on entry.

 *

 * Returns: The RID.

 */

u32 pci_msi_map_rid_ctlr_node(struct pci_dev *pdev, struct device_node **node)

{

	u32 rid = pci_dev_id(pdev);



	pci_for_each_dma_alias(pdev, get_msi_id_cb, &rid);



	return of_msi_xlate(&pdev->dev, node, rid);

}



/**

 * pci_msi_get_device_domain - Get the MSI domain for a given PCI device

 * @pdev:	The PCI device

include/linux/msi.h

+1 −0
Original line number Diff line number Diff line
@@ -705,6 +705,7 @@ struct irq_domain *pci_msi_create_irq_domain(struct fwnode_handle *fwnode, 
					     struct msi_domain_info *info,

					     struct irq_domain *parent);

u32 pci_msi_domain_get_msi_rid(struct irq_domain *domain, struct pci_dev *pdev);

u32 pci_msi_map_rid_ctlr_node(struct pci_dev *pdev, struct device_node **node);

struct irq_domain *pci_msi_get_device_domain(struct pci_dev *pdev);

#else /* CONFIG_PCI_MSI */

static inline struct irq_domain *pci_msi_get_device_domain(struct pci_dev *pdev)