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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: Lorenzo Pieralisi <lpieralisi@kernel.org>
Reviewed-by: Marc 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: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Lorenzo Pieralisi 2025-07-03 12:25:15 +02:00 committed by Marc Zyngier
parent 31fd3becb9
commit cd0ec59aff
2 changed files with 21 additions and 0 deletions
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20
drivers/pci/msi/irqdomain.c
View File

@ -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

1
include/linux/msi.h
View File

@ -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)