linux-kernel - [PATCH v2 2/4] PCI/MSI: Add startup/shutdown for per device domains

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Message-Id: <20250827093911.1218640-1-wei.fang@nxp.com>
Date: Wed, 27 Aug 2025 17:39:11 +0800
From: Wei Fang <wei.fang@....com>
To: inochiama@...il.com
Cc: Jonathan.Cameron@...ei.com,
	bhelgaas@...gle.com,
	dlan@...too.org,
	haiyangz@...rosoft.com,
	jgg@...pe.ca,
	jgross@...e.com,
	linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org,
	looong.bin@...il.com,
	lpieralisi@...nel.org,
	maz@...nel.org,
	nicolinc@...dia.com,
	shradhagupta@...ux.microsoft.com,
	tglx@...utronix.de,
	unicorn_wang@...look.com
Subject: [PATCH v2 2/4] PCI/MSI: Add startup/shutdown for per device domains

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@...95evk:~# 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@...95evk:~# 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.