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| author | Lorenzo Pieralisi <lpieralisi@kernel.org> | 2025-07-03 12:25:14 +0200 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2025-07-08 18:35:52 +0100 |
| commit | 31fd3becb920e0b31b99cf202ace637f75dd7e78 (patch) | |
| tree | e1189c39607415e98d75cb8768e046278cab285e /drivers/of | |
| parent | 03a28dc39838e67164728ad410081352b1589d78 (diff) | |
| download | net-31fd3becb920e0b31b99cf202ace637f75dd7e78.tar.gz | |
of/irq: Add of_msi_xlate() helper function
Add an of_msi_xlate() helper that maps a device ID and returns
the device node of the MSI controller the device ID is mapped to.
Required by core functions that need an MSI controller device node
pointer at the same time as a mapped device ID, of_msi_map_id() is not
sufficient for that purpose.
Signed-off-by: Lorenzo Pieralisi <lpieralisi@kernel.org>
Reviewed-by: Marc Zyngier <maz@kernel.org>
Cc: Rob Herring <robh@kernel.org>
Cc: Marc Zyngier <maz@kernel.org>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://lore.kernel.org/r/20250703-gicv5-host-v7-24-12e71f1b3528@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>
Diffstat (limited to 'drivers/of')
| -rw-r--r-- | drivers/of/irq.c | 22 |
1 files changed, 17 insertions, 5 deletions
diff --git a/drivers/of/irq.c b/drivers/of/irq.c index f8ad79b9b1c914..74aaea61de13c9 100644 --- a/drivers/of/irq.c +++ b/drivers/of/irq.c @@ -670,8 +670,20 @@ err: } } -static u32 __of_msi_map_id(struct device *dev, struct device_node **np, - u32 id_in) +/** + * of_msi_xlate - map a MSI ID and find relevant MSI controller node + * @dev: device for which the mapping is to be done. + * @msi_np: Pointer to store the MSI controller node + * @id_in: Device ID. + * + * Walk up the device hierarchy looking for devices with a "msi-map" + * property. If found, apply the mapping to @id_in. @msi_np pointed + * value must be NULL on entry, if an MSI controller is found @msi_np is + * initialized to the MSI controller node with a reference held. + * + * Returns: The mapped MSI id. + */ +u32 of_msi_xlate(struct device *dev, struct device_node **msi_np, u32 id_in) { struct device *parent_dev; u32 id_out = id_in; @@ -682,7 +694,7 @@ static u32 __of_msi_map_id(struct device *dev, struct device_node **np, */ for (parent_dev = dev; parent_dev; parent_dev = parent_dev->parent) if (!of_map_id(parent_dev->of_node, id_in, "msi-map", - "msi-map-mask", np, &id_out)) + "msi-map-mask", msi_np, &id_out)) break; return id_out; } @@ -700,7 +712,7 @@ static u32 __of_msi_map_id(struct device *dev, struct device_node **np, */ u32 of_msi_map_id(struct device *dev, struct device_node *msi_np, u32 id_in) { - return __of_msi_map_id(dev, &msi_np, id_in); + return of_msi_xlate(dev, &msi_np, id_in); } /** @@ -719,7 +731,7 @@ struct irq_domain *of_msi_map_get_device_domain(struct device *dev, u32 id, { struct device_node *np = NULL; - __of_msi_map_id(dev, &np, id); + of_msi_xlate(dev, &np, id); return irq_find_matching_host(np, bus_token); } |