Hello, I am seeing an apparent issue with PCIe MSI interrupts and I-pipe when trying to move to a newer kernel and I-pipe patch.
The issue is as soon as a PCIe MSI interrupt occurs, the system hangs with no message output on the serial console or in /var/log/messages. The platform I am working on is a "i.MX 6 Quad" and I am upgrading from a 4.14.62 kernel and I-pipe patch with Xenomai 3.07 to 5.4.151 kernel and I-pipe patch with Xenomai 3.2.1. Our FPGA is connected to the i.MX 6 via PCIe and generates PCIe MSI interrupts to the CPU from, for example, an Altera Triple-Speed MAC. I have stable system running for some time with Linux 4.14.62 with Xenomai 3.07 although I did need to patch the PCIe driver [1]. Also some time back, I tried to move to 4.14.110 with I-pipe and also saw same scenario of my system hanging on the first PCIe MSI interrupt so I backed out back to 4.14.62. Now I am trying to move to 5.4.151, but see the same hang. Before I dive into analyzing the hang, I wanted to ask: What are other people's experiences with using PCIe MSI interrupts and I-pipe? I am thinking of trying 5.10.103 Dovetail to see if I still see the problem. Would this be recommended? Thanks, Scott [1] https://xenomai.org/pipermail/xenomai/2021-August/046138.html
