linux-kernel - Re: No controller seen in /sys/kernel/config/pci

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Message-ID: <CAHP4M8X67WSLMqe2qQrbODrg5oSLvR5fP4JVN+zeQafHizrOXA@mail.gmail.com>
Date:   Thu, 21 Jul 2022 15:54:17 +0530
From:   Ajay Garg <ajaygargnsit@...il.com>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     Kishon Vijay Abraham I <kishon@...com>, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: No controller seen in /sys/kernel/config/pci_ep/controllers

Any pointers please?

Thanks and Regards,
Ajay

On Wed, Jul 13, 2022 at 11:48 PM Bjorn Helgaas <helgaas@...nel.org> wrote:
>
> [+to Kishon, endpoint maintainer, +cc LKML]
>
> On Wed, Jul 13, 2022 at 12:53:06PM +0530, Ajay Garg wrote:
> > Hello everyone.
> >
> > The kernel has been built with :
> >
> > ###################################
> > CONFIG_PCI_ENDPOINT=y
> > CONFIG_PCI_ENDPOINT_CONFIGFS=y
> > CONFIG_PCI_EPF_TEST=y
> > CONFIG_PCI_ENDPOINT_TEST=y
> > ###################################
> >
> >
> > Thereafter, following are seen :
> >
> > ###################################
> > $ sudo mount none /sys/kernel/config/ -t configfs
> > mount: /sys/kernel/config: none already mounted or mount point busy.
> >
> > $ ls -lrth /sys/class/pci_epc/
> > total 0
> >
> > $ ls -lrth /sys/kernel/config
> > total 0
> > drwxr-xr-x 4 root root 0 Jul 13 10:58 pci_ep
> > drwxr-xr-x 2 root root 0 Jul 13 10:58 usb_gadget
> >
> > $ ls -lrth /sys/kernel/config/pci_ep/functions
> > total 0
> > drwxr-xr-x 2 root root 0 Jul 13 10:58 pci_epf_test
> >
> > $ ls -lrth /sys/kernel/config/pci_ep/controllers
> > total 0
> >
> > $
> > ###################################
> >
> > What is being missed?
> >
> > Side Queries : Is the controller that is expected to be listed, a
> > virtual-controller (like the one provided by CONFIG_USB_DUMMY_HCD in
> > case of USB)?
> >
> > Or there must be a real additional controller for pci-endpoint purpose?
> > If yes, then :
> >
> >               * I guess no listing is expected currently, as my machine has just
> >                 one controller (as pci-host).
> >
> >               * Is there a way to have an additional virtual pci-controller?
> >
> >
> > Thanks and Regards,
> > Ajay