Re-enumerating the PCIe bus/tree via echo 1 > /sys/bus/pci/rescan is the correct solution. We are using it the same way as you described it. We are using echo 1 > $pcidevice/remove to disconnect the driver from the device and to detach the device from the tree. The driver (xillybus) is not unloaded, just disconnected. A … Read more
Linux kernel point of view A good way to learn something is to interact with it, so let’s use the Linux kernel for that. Here is a minimal PCI example on a QEMU emulated device: https://github.com/cirosantilli/linux-kernel-module-cheat/blob/366b1c1af269f56d6a7e6464f2862ba2bc368062/kernel_module/pci.c The first 64 bytes of the PCI configuration are standardized as: Image from LDD3. So we can see that … Read more