How to read PCI config of another device

NTDEV
1

Hello guys,

I need to read the config of another PCI device, because my own device
provides functionality that duplicates that of the other device, but
I only want my driver to expose the functionality if the user has
disabled it in the other device by setting a bit. Is this a good
reason to want to read the other device’s config?

I know the other device’s PCI vendor/device IDs and want the driver
to be WDM and work in any WDM OS.

  1. use cf8/cfc - too dirty

  2. find the FDO of the PCI bus, created by the PCI bus driver,
    send it “query device bus relations” and find the other device’s
    PDO - don’t know how to find the PCI FDO.

Any other ideas?

Thank you very much!

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2

Hello guys,

I need to read the config of another PCI device, because my own device
provides functionality that duplicates that of the other device, but
I only want my driver to expose the functionality if the user has
disabled it in the other device by setting a bit. Is this a good
reason to want to read the other device’s config?

I know the other device’s PCI vendor/device IDs and want the driver
to be WDM and work in any WDM OS.

I see the following options:

  1. use cf8/cfc - too dirty

  2. find the FDO of the PCI bus, created by the PCI bus driver,
    send it “query device bus relations” and find the other device’s
    PDO - don’t know how to find the PCI FDO.

Any other ideas?

Thank you very much!

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