Why there is no pcie dpc_inject?

since 2006 there is aer_inject in linux kernel, why there is no dpc_inject (I guess there will be a reason)? if I want to to simulate or test dpc any suggestions or code available? dpc=Downstream Port Containment

when both aer/dpc enabled:

1.if dpc triggers its interrupt, the error msg will forward to aer, the reverse is false. - is this right?

2.can I use aer_inject to trigger dpc? if not can I hard code to trigger dpc?

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