On a system with a Mellanox Technologies MT27800 Family [ConnectX-5]
NIC controller containing a power button, hot-plug fails to function
properly.
Normal, expected, scenario:
o Press the OCP NIC's power button;
o Power button LED blinks and turns off (delivering event message
to CPU);
o Verify NIC is offline via 'lspci';
o Remove controller.
Scenario with cmdline parameter 'pcie_port_pm=off':
o Press NIC's power button;
o LED turns off;
o Verify NIC is offline;
o Press power button (in an attempt to hot-add controller);
o NIC is not recognized.
Scenario with no cmdline parameter, or ''pcie_aspm=off', or
'pcie_aspm=off pcie_port_pm=off':
o Press NIC's power button;
o LED continuously flashes;
o Checking via 'lspci' indicates NIC is offline but with LED
flashing, the controller can not be removed.
The 'dmesg', and 'lspci', logs are included within the
associated bugzilla:
https://bugzilla.kernel.org/show_bug.cgi?id=209113
As stated in the bugzilla, I'm relaying all this information second
hand. Hoping to get the affected party involved directly.
