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Implement the doorbell feature by mapping the EP's MSI interrupt controller message address to a dedicated BAR. The EPF driver should pass the actual message data to be written to the message address by the host through implementation-specific logic. Signed-off-by: Frank Li <Frank.Li@nxp.com> [mani: minor code cleanups and reworded commit message] Signed-off-by: Manivannan Sadhasivam <mani@kernel.org> [bhelgaas: fix kernel-doc] Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Tested-by: Niklas Cassel <cassel@kernel.org> Link: https://patch.msgid.link/20250710-ep-msi-v21-3-57683fc7fb25@nxp.com