Re: pcie hotplug driver probe is not getting called

[Bjorn Helgaas <helgaas@kernel.org>]

On Fri, Sep 27, 2024 at 08:50:41PM +0530, Maverickk 78 wrote:
> Hello
> 
> Debugging a downstream port with slot capabilities indicating hotplug
> capability is advertised in pci capability(id =0x10) .
> 
> None of the hotplug driver is getting invoked.
> 
> I assume pciehp_probe should've been called because its associated
> with ".port_type = PCIE_ANY_PORT," in the pcie_port_service_driver
> structure.
> 
> I assumed SHPC shpc_probe function would be called because the pci_id
> table has PCI_CLASS_BRIDGE_PCI_NORMAL, but nothing related to hotplug
> drivers is seen in the ftrace or dmesg.
> 
> Tried "pciehp.pciehp_force=1 pciehp.pciehp_debug=1" in the command
> line but no luck
> 
> As part of port initialization if the hotplug capability is indicated
> in the capability register the hotplug drivers should have been
> invoked, but looks like its not the case.

I would expect pciehp to work in this case, but there is some
negotiation between the OS and the firmware to figure out which
owns it.

I assume you have CONFIG_PCIEPORTBUS and CONFIG_HOTPLUG_PCI_PCIE
enabled?  Can you supply the dmesg log and output of "sudo lspci -vv"?

Bjorn