Find out PCI(e) ID of a working PCI(e) device, in this case a USB controller

I inserted a mPCIe card - a USB controller - into one of my computers mPCIe slots. Attached USB devices are shown by lsusb and everything is working fine. Now I'm running KVM/qemu and I want to pass-through not just single USB devices but the USB controller as PCIe device to a virtual machine - as I already did with on-board NICs (also PCIe). So I figured the USB controller is announcing itself as a PCI connected device when calling lspci - but it isn't:

# lspci
00:00.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 16h (Models 30h-3fh) Processor Root Complex
00:00.2 IOMMU: Advanced Micro Devices, Inc. [AMD] Mullins IOMMU
00:02.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 16h (Models 30h-3fh) Host Bridge
00:02.2 PCI bridge: Advanced Micro Devices, Inc. [AMD] Family 16h Processor Functions 5:1
00:02.3 PCI bridge: Advanced Micro Devices, Inc. [AMD] Family 16h Processor Functions 5:1
00:02.4 PCI bridge: Advanced Micro Devices, Inc. [AMD] Family 16h Processor Functions 5:1
00:08.0 Encryption controller: Advanced Micro Devices, Inc. [AMD] Kabini/Mullins PSP-Platform Security Processor
00:10.0 USB controller: Advanced Micro Devices, Inc. [AMD] FCH USB XHCI Controller (rev 11)
00:11.0 SATA controller: Advanced Micro Devices, Inc. [AMD] FCH SATA Controller [IDE mode] (rev 39)
00:13.0 USB controller: Advanced Micro Devices, Inc. [AMD] FCH USB EHCI Controller (rev 39)
00:14.0 SMBus: Advanced Micro Devices, Inc. [AMD] FCH SMBus Controller (rev 42)
00:14.3 ISA bridge: Advanced Micro Devices, Inc. [AMD] FCH LPC Bridge (rev 11)
00:14.7 SD Host controller: Advanced Micro Devices, Inc. [AMD] FCH SD Flash Controller (rev 01)
00:18.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 16h (Models 30h-3fh) Processor Function 0
00:18.1 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 16h (Models 30h-3fh) Processor Function 1
00:18.2 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 16h (Models 30h-3fh) Processor Function 2
00:18.3 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 16h (Models 30h-3fh) Processor Function 3
00:18.4 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 16h (Models 30h-3fh) Processor Function 4
00:18.5 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 16h (Models 30h-3fh) Processor Function 5
01:00.0 Ethernet controller: Intel Corporation I210 Gigabit Network Connection (rev 03)
02:00.0 Ethernet controller: Intel Corporation I210 Gigabit Network Connection (rev 03)
03:00.0 Ethernet controller: Intel Corporation I210 Gigabit Network Connection (rev 03)

The computer is a PC engines APU2 embedded computer, AMD based (https://www.pcengines.ch/apu2.htm) - running Debian Linux. lsusb shows the connected USB devices being connected to the USB controller in question. Question: How can I find out which PCI(e) ID/device my USB controller is connected to in order to know which one to pass-through so it pops up in my virtual machine as native PCI(e) device? I figured potentially by the USB bus ID of what lsusb spits out - however that's as far as I got.