On 21/07/22 15:54, Ajay Garg wrote: > Any pointers please? > > Thanks and Regards, > Ajay > > On Wed, Jul 13, 2022 at 11:48 PM Bjorn Helgaas <helgaas@xxxxxxxxxx> 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)? There are no virtual PCIe endpoint controllers in Linux. >>> >>> Or there must be a real additional controller for pci-endpoint purpose? right, there should be an endpoint controller and the driver for it should register with the Linux endpoint framework. >>> If yes, then : >>> >>> * I guess no listing is expected currently, as my machine has just >>> one controller (as pci-host). correct. >>> >>> * Is there a way to have an additional virtual pci-controller? Not sure what exactly your use case is. All it's going to need is the driver to use devm_pci_epc_create() to register a endpoint controller. You can refer existing endpoint controller drivers https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/pci/controller/cadence/pcie-cadence-ep.c https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/pci/controller/dwc/pcie-designware-ep.c Thanks, Kishon
