diff options
| author | Frank Li <Frank.Li@nxp.com> | 2025-04-14 14:30:59 -0400 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2025-05-07 17:49:24 +0200 |
| commit | f1680d9081e161925c3aca81231ee867c95890b0 (patch) | |
| tree | 0c89067ac010265a936f90dc3d8dbe3c6c096117 | |
| parent | a6aed6b9c79e57064fa8c028662214b436578e80 (diff) | |
irqchip/gic-v3-its: Add support for device tree msi-map and msi-mask
Some platform devices create child devices dynamically and require the
parent device's msi-map to map device IDs to actual sideband information.
A typical use case is using ITS as a PCIe Endpoint Controller(EPC)'s
doorbell function, where PCI hosts send TLP memory writes to the EP
controller. The EP controller converts these writes to AXI transactions
and appends platform-specific sideband information.
EPC's DTS will provide such information by msi-map and msi-mask. A
simplified dts as
pcie-ep@10000000 {
...
msi-map = <0 &its 0xc 8>;
^^^ 0xc is implement defined sideband information,
which append to AXI write transaction.
^ 0 is function index.
msi-mask = <0x7>
}
Check msi-map if msi-parent missed to keep compatility with existing systems.
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/20250414-ep-msi-v18-5-f69b49917464@nxp.com
| -rw-r--r-- | drivers/irqchip/irq-gic-v3-its-msi-parent.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/irqchip/irq-gic-v3-its-msi-parent.c b/drivers/irqchip/irq-gic-v3-its-msi-parent.c index bdb04c808148..68f9ba4085ce 100644 --- a/drivers/irqchip/irq-gic-v3-its-msi-parent.c +++ b/drivers/irqchip/irq-gic-v3-its-msi-parent.c @@ -118,6 +118,14 @@ static int of_pmsi_get_dev_id(struct irq_domain *domain, struct device *dev, index++; } while (!ret); + if (ret) { + struct device_node *np = NULL; + + ret = of_map_id(dev->of_node, dev->id, "msi-map", "msi-map-mask", &np, dev_id); + if (np) + of_node_put(np); + } + return ret; } |