MSI Interrupts - 4.1 English

DMA/Bridge Subsystem for PCI Express Product Guide (PG195)

Document ID
PG195
Release Date
2023-11-24
Version
4.1 English

For MSI interrupts, you can select from 1 to 32 vectors in the PCIe Misc tab under MSI Capabilities, which consists of a maximum of 16 usable DMA interrupt vectors and a maximum of 16 usable user interrupt vectors. The Linux operating system (OS) supports only 1 vector. Other operating systems might support more vectors and you can program different vectors values in the IRQ Block Channel Vector (see IRQ Block Channel Vector Number (0xA0)) and in the IRQ Block User Vector (see IRQ Block User Vector Number (0x80)) to represent different interrupt sources. The AMD Linux driver supports only 1 MSI vector.