[PATCH v2 2/4] PCI/MSI: Add startup/shutdown for per device domains
From: Wei Fang
Date: Wed Aug 27 2025 - 06:00:18 EST
We found an issue that the ENETC network port of our i.MX95 platform
(arm64) does not work based the latest linux-next tree. According to
my observation, the MSI-X interrupts statistics from
"cat /proc/interrupts" are all 0.
root@imx95evk:~# cat /proc/interrupts | grep eth0
123: 0 0 0 0 0 0 ITS-PCI-MSIX-0002:00:00.0 1 Edge eth0-rxtx0
124: 0 0 0 0 0 0 ITS-PCI-MSIX-0002:00:00.0 2 Edge eth0-rxtx1
125: 0 0 0 0 0 0 ITS-PCI-MSIX-0002:00:00.0 3 Edge eth0-rxtx2
126: 0 0 0 0 0 0 ITS-PCI-MSIX-0002:00:00.0 4 Edge eth0-rxtx3
127: 0 0 0 0 0 0 ITS-PCI-MSIX-0002:00:00.0 5 Edge eth0-rxtx4
128: 0 0 0 0 0 0 ITS-PCI-MSIX-0002:00:00.0 6 Edge eth0-rxtx5
So I reverted this patch and then the MSI-X interrupts return to normal.
root@imx95evk:~# cat /proc/interrupts | grep eth0
123: 4365 0 0 0 0 0 ITS-PCI-MSIX-0002:00:00.0 1 Edge eth0-rxtx0
124: 0 194 0 0 0 0 ITS-PCI-MSIX-0002:00:00.0 2 Edge eth0-rxtx1
125: 0 0 227 0 0 0 ITS-PCI-MSIX-0002:00:00.0 3 Edge eth0-rxtx2
126: 0 0 0 219 0 0 ITS-PCI-MSIX-0002:00:00.0 4 Edge eth0-rxtx3
127: 0 0 0 0 176 0 ITS-PCI-MSIX-0002:00:00.0 5 Edge eth0-rxtx4
128: 0 0 0 0 0 233 ITS-PCI-MSIX-0002:00:00.0 6 Edge eth0-rxtx5
It looks like that this patch causes this issue, but I don't know about
the PCI MSI driver, so please help investigate this issue, thanks.