Function Level Reset notification to Linux PCIe device driver

rgag · 04-09-2021, 04:58 AM

This query is regarding Function level reset feature for SRIOV. As per code in Linux PCIe driver the function level reset is done by writing 1 to reset under sysfs interface:

echo 1 > /sys/bus/pci/devices/pci_interface_id/reset

As function level reset is not triggered via the PCIe device driver how PCIe device driver can get the notification of the function level reset(FLR)?

smallpond · 04-09-2021, 07:44 AM

Edit: corrected description.

PCIe function level reset is standard for all devices as setting a register bit in a PCIe control register. This means the individual driver is not involved. It would depend on the individual device whether it would get an interrupt or detect the change through some other mechanism.