July 17, 2014
4:47 a.m.
On Thu, 17 Jul 2014 05:58:03 +0800, Amerei Acuna said:
I'm writing a custom PCI driver for a hobby endpoint. Due to some "special", possibly unique, circumstance, I need to determine if two devices form a pair. As I'm using a PCI switch to connect these two devices, I'm thinking on the possibility of checking if the two devices share a common pci-pci bridge (or finding the least common ancestor in a directed graph).
What happens if your two devices and a totally unrelated PCI device are all three downstream of the same PCI bridge?