.. SPDX-License-Identifier: GPL-2.0 =================== PCI Test User Guide =================== :Author: Kishon Vijay Abraham I This document is a guide to help users use pci-epf-test function driver and pci_endpoint_test host driver for testing PCI. The list of steps to be followed in the host side and EP side is given below. Endpoint Device =============== Endpoint Controller Devices --------------------------- To find the list of endpoint controller devices in the system:: # ls /sys/class/pci_epc/ 51000000.pcie_ep If PCI_ENDPOINT_CONFIGFS is enabled:: # ls /sys/kernel/config/pci_ep/controllers 51000000.pcie_ep Endpoint Function Drivers ------------------------- To find the list of endpoint function drivers in the system:: # ls /sys/bus/pci-epf/drivers pci_epf_test If PCI_ENDPOINT_CONFIGFS is enabled:: # ls /sys/kernel/config/pci_ep/functions pci_epf_test Creating pci-epf-test Device ---------------------------- PCI endpoint function device can be created using the configfs. To create pci-epf-test device, the following commands can be used:: # mount -t configfs none /sys/kernel/config # cd /sys/kernel/config/pci_ep/ # mkdir functions/pci_epf_test/func1 The "mkdir func1" above creates the pci-epf-test function device that will be probed by pci_epf_test driver. The PCI endpoint framework populates the directory with the following configurable fields:: # ls functions/pci_epf_test/func1 baseclass_code interrupt_pin progif_code subsys_id cache_line_size msi_interrupts revid subsys_vendorid deviceid msix_interrupts subclass_code vendorid The PCI endpoint function driver populates these entries with default values when the device is bound to the driver. The pci-epf-test driver populates vendorid with 0xffff and interrupt_pin with 0x0001:: # cat functions/pci_epf_test/func1/vendorid 0xffff # cat functions/pci_epf_test/func1/interrupt_pin 0x0001 Configuring pci-epf-test Device ------------------------------- The user can configure the pci-epf-test device using configfs entry. In order to change the vendorid and the number of MSI interrupts used by the function device, the following commands can be used:: # echo 0x104c > functions/pci_epf_test/func1/vendorid # echo 0xb500 > functions/pci_epf_test/func1/deviceid # echo 32 > functions/pci_epf_test/func1/msi_interrupts # echo 2048 > functions/pci_epf_test/func1/msix_interrupts Binding pci-epf-test Device to EP Controller -------------------------------------------- In order for the endpoint function device to be useful, it has to be bound to a PCI endpoint controller driver. Use the configfs to bind the function device to one of the controller driver present in the system:: # ln -s functions/pci_epf_test/func1 controllers/51000000.pcie_ep/ Once the above step is completed, the PCI endpoint is ready to establish a link with the host. Start the Link -------------- In order for the endpoint device to establish a link with the host, the _start_ field should be populated with '1':: # echo 1 > controllers/51000000.pcie_ep/start RootComplex Device ================== lspci Output ------------ Note that the devices listed here correspond to the value populated in 1.4 above:: 00:00.0 PCI bridge: Texas Instruments Device 8888 (rev 01) 01:00.0 Unassigned class [ff00]: Texas Instruments Device b500 Using Endpoint Test function Device ----------------------------------- Kselftest added in tools/testing/selftests/pci_endpoint can be used to run all the default PCI endpoint tests. To build the Kselftest for PCI endpoint subsystem, the following commands should be used:: # cd # make -C tools/testing/selftests/pci_endpoint or if you desire to compile and install in your system:: # cd # make -C tools/testing/selftests/pci_endpoint INSTALL_PATH=/usr/bin install The test will be located in /usr/bin/ Kselftest Output ~~~~~~~~~~~~~~~~ :: # pci_endpoint_test TAP version 13 1..16 # Starting 16 tests from 9 test cases. # RUN pci_ep_bar.BAR0.BAR_TEST ... # OK pci_ep_bar.BAR0.BAR_TEST ok 1 pci_ep_bar.BAR0.BAR_TEST # RUN pci_ep_bar.BAR1.BAR_TEST ... # OK pci_ep_bar.BAR1.BAR_TEST ok 2 pci_ep_bar.BAR1.BAR_TEST # RUN pci_ep_bar.BAR2.BAR_TEST ... # OK pci_ep_bar.BAR2.BAR_TEST ok 3 pci_ep_bar.BAR2.BAR_TEST # RUN pci_ep_bar.BAR3.BAR_TEST ... # OK pci_ep_bar.BAR3.BAR_TEST ok 4 pci_ep_bar.BAR3.BAR_TEST # RUN pci_ep_bar.BAR4.BAR_TEST ... # OK pci_ep_bar.BAR4.BAR_TEST ok 5 pci_ep_bar.BAR4.BAR_TEST # RUN pci_ep_bar.BAR5.BAR_TEST ... # OK pci_ep_bar.BAR5.BAR_TEST ok 6 pci_ep_bar.BAR5.BAR_TEST # RUN pci_ep_basic.CONSECUTIVE_BAR_TEST ... # OK pci_ep_basic.CONSECUTIVE_BAR_TEST ok 7 pci_ep_basic.CONSECUTIVE_BAR_TEST # RUN pci_ep_basic.LEGACY_IRQ_TEST ... # OK pci_ep_basic.LEGACY_IRQ_TEST ok 8 pci_ep_basic.LEGACY_IRQ_TEST # RUN pci_ep_basic.MSI_TEST ... # OK pci_ep_basic.MSI_TEST ok 9 pci_ep_basic.MSI_TEST # RUN pci_ep_basic.MSIX_TEST ... # OK pci_ep_basic.MSIX_TEST ok 10 pci_ep_basic.MSIX_TEST # RUN pci_ep_data_transfer.memcpy.READ_TEST ... # OK pci_ep_data_transfer.memcpy.READ_TEST ok 11 pci_ep_data_transfer.memcpy.READ_TEST # RUN pci_ep_data_transfer.memcpy.WRITE_TEST ... # OK pci_ep_data_transfer.memcpy.WRITE_TEST ok 12 pci_ep_data_transfer.memcpy.WRITE_TEST # RUN pci_ep_data_transfer.memcpy.COPY_TEST ... # OK pci_ep_data_transfer.memcpy.COPY_TEST ok 13 pci_ep_data_transfer.memcpy.COPY_TEST # RUN pci_ep_data_transfer.dma.READ_TEST ... # OK pci_ep_data_transfer.dma.READ_TEST ok 14 pci_ep_data_transfer.dma.READ_TEST # RUN pci_ep_data_transfer.dma.WRITE_TEST ... # OK pci_ep_data_transfer.dma.WRITE_TEST ok 15 pci_ep_data_transfer.dma.WRITE_TEST # RUN pci_ep_data_transfer.dma.COPY_TEST ... # OK pci_ep_data_transfer.dma.COPY_TEST ok 16 pci_ep_data_transfer.dma.COPY_TEST # PASSED: 16 / 16 tests passed. # Totals: pass:16 fail:0 xfail:0 xpass:0 skip:0 error:0 Testcase 16 (pci_ep_data_transfer.dma.COPY_TEST) will fail for most of the DMA capable endpoint controllers due to the absence of the MEMCPY over DMA. For such controllers, it is advisable to skip this testcase using this command:: # pci_endpoint_test -f pci_ep_bar -f pci_ep_basic -v memcpy -T COPY_TEST -v dma