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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. See below figure. =E2=94=8C=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94= =80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2= =94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94= =80=E2=94=80=E2=94=90 =E2=94=82 =E2=94=82 =E2=94=82 PCI Endpoint Controller =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=8C=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2= =94=80=E2=94=90 =E2=94=8C=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2= =94=90 =E2=94=8C=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=90 = =E2=94=82 PCI Bus =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82= =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94= =80=E2=94=80=E2=96=BA =E2=94=82 =E2=94=82Func1=E2=94=82 =E2=94=82Func2= =E2=94=82 ... =E2=94=82Func =E2=94=82 =E2=94=82 TLP Memory =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82= =E2=94=82 =E2=94=82 =E2=94=82 Write Push =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82= =E2=94=82 =E2=94=82 =E2=94=82 DoorBell =E2=94=82 =E2=94=94=E2=94=80=E2=94=AC=E2=94=80=E2=94=AC=E2= =94=80=E2=94=98 =E2=94=94=E2=94=80=E2=94=80=E2=94=AC=E2=94=80=E2=94=80=E2= =94=98 =E2=94=94=E2=94=80=E2=94=80=E2=94=AC=E2=94=80=E2=94=80=E2=94=98 = =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 = =E2=94=82 =E2=94=82 =E2=94=94=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=BC=E2=94= =80=E2=94=BC=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=BC=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2= =94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=BC=E2=94=80=E2=94=80=E2=94= =80=E2=94=80=E2=94=98 sideband =E2=94=82 =E2=94=82 Address=E2=94=82 =E2=94= =82 information =E2=96=BC =E2=96=BC /Data =E2=96=BC =E2=96= =BC =E2=94=8C=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2= =94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94= =80=E2=94=80=E2=94=80=E2=94=90 =E2=94=82 MSI Controller =E2=94=82 =E2=94=94=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2= =94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94= =80=E2=94=80=E2=94=80=E2=94=98 EPC's DTS will provide such information by msi-map and msi-mask. A simplified dts as pcie-ep@10000000 { ... msi-map =3D <0 &its 0xc 8>; ^^^ 0xc is implement defined sideband information, which append to AXI write transaction. ^ 0 is function index. msi-mask =3D <0x7> } Check msi-map if msi-parent missed to keep compatility with existed system. Signed-off-by: Frank Li --- drivers/irqchip/irq-gic-v3-its-msi-parent.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/irqchip/irq-gic-v3-its-msi-parent.c b/drivers/irqchip/= irq-gic-v3-its-msi-parent.c index e150365fbe892..6c7389bb84a4a 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 *domai= n, struct device *dev, index++; } while (!ret); =20 + if (ret) { + struct device_node *np =3D NULL; + + ret =3D of_map_id(dev->of_node, dev->id, "msi-map", "msi-map-mask", &np,= dev_id); + if (np) + of_node_put(np); + } + return ret; } =20 --=20 2.34.1