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Taking BusID output from lspci and storing in a variable

I am trying to get the BusID's of each video card stored in a server and putting them in a variable each to be used for an input to a simple find and replace perl script. How would I go about getting ...
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Map PCIe slot number (or BDF) to device number or vice versa

Is there any way to know the drive number from BDF or slot number of a PCIe or vice versa? Suppose I have four PCIe drives attached to my system. And I know their BDF's, I want to know each of the ...
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Can I Intentionally Disable PCIe Lanes? Or lower PCIe Width?

I am doing some testing on my server and want to lower the width to my PCIe device (or its PCIe bridge). In case it is relevant, I figured out how to lower my speed based on the PCI Spec with Linux'...