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I have a PCIe (ver 2) linux system. I want to find out how many PCIe lanes were negotiated and are being used between my device and the host controller . (I do not know how many lanes my device supports or how many lanes the slot has)

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lspci -vv should give you this information, look for the "Width" part in the LnkCap section.

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    Note that "LnkCap" is the capability of the slot, and "LnkSta" is the actual status of the card. I had to run this as root to get the link info.
    – Nattgew
    Nov 19, 2016 at 17:02

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