src/kernel/linux/v4.19/Documentation/PCI/endpoint/pci-test-howto.txt

			    PCI TEST USERGUIDE
		    Kishon Vijay Abraham I <kishon@ti.com>

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.

1. Endpoint Device

1.1 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

1.2 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

1.3 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

1.4 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 16 > functions/pci_epf_test/func1/msi_interrupts
	# echo 8 > functions/pci_epf_test/func1/msix_interrupts

1.5 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.

1.6 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

2. RootComplex Device

2.1 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

2.2 Using Endpoint Test function Device

pcitest.sh added in tools/pci/ can be used to run all the default PCI endpoint
tests. Before pcitest.sh can be used pcitest.c should be compiled using the
following commands.

	cd <kernel-dir>
	make headers_install ARCH=arm
	arm-linux-gnueabihf-gcc -Iusr/include tools/pci/pcitest.c -o pcitest
	cp pcitest  <rootfs>/usr/sbin/
	cp tools/pci/pcitest.sh <rootfs>

2.2.1 pcitest.sh Output
	# ./pcitest.sh
	BAR tests

	BAR0:           OKAY
	BAR1:           OKAY
	BAR2:           OKAY
	BAR3:           OKAY
	BAR4:           NOT OKAY
	BAR5:           NOT OKAY

	Interrupt tests

	SET IRQ TYPE TO LEGACY:         OKAY
	LEGACY IRQ:     NOT OKAY
	SET IRQ TYPE TO MSI:            OKAY
	MSI1:           OKAY
	MSI2:           OKAY
	MSI3:           OKAY
	MSI4:           OKAY
	MSI5:           OKAY
	MSI6:           OKAY
	MSI7:           OKAY
	MSI8:           OKAY
	MSI9:           OKAY
	MSI10:          OKAY
	MSI11:          OKAY
	MSI12:          OKAY
	MSI13:          OKAY
	MSI14:          OKAY
	MSI15:          OKAY
	MSI16:          OKAY
	MSI17:          NOT OKAY
	MSI18:          NOT OKAY
	MSI19:          NOT OKAY
	MSI20:          NOT OKAY
	MSI21:          NOT OKAY
	MSI22:          NOT OKAY
	MSI23:          NOT OKAY
	MSI24:          NOT OKAY
	MSI25:          NOT OKAY
	MSI26:          NOT OKAY
	MSI27:          NOT OKAY
	MSI28:          NOT OKAY
	MSI29:          NOT OKAY
	MSI30:          NOT OKAY
	MSI31:          NOT OKAY
	MSI32:          NOT OKAY
	SET IRQ TYPE TO MSI-X:          OKAY
	MSI-X1:         OKAY
	MSI-X2:         OKAY
	MSI-X3:         OKAY
	MSI-X4:         OKAY
	MSI-X5:         OKAY
	MSI-X6:         OKAY
	MSI-X7:         OKAY
	MSI-X8:         OKAY
	MSI-X9:         NOT OKAY
	MSI-X10:        NOT OKAY
	MSI-X11:        NOT OKAY
	MSI-X12:        NOT OKAY
	MSI-X13:        NOT OKAY
	MSI-X14:        NOT OKAY
	MSI-X15:        NOT OKAY
	MSI-X16:        NOT OKAY
	[...]
	MSI-X2047:      NOT OKAY
	MSI-X2048:      NOT OKAY

	Read Tests

	SET IRQ TYPE TO MSI:            OKAY
	READ (      1 bytes):           OKAY
	READ (   1024 bytes):           OKAY
	READ (   1025 bytes):           OKAY
	READ (1024000 bytes):           OKAY
	READ (1024001 bytes):           OKAY

	Write Tests

	WRITE (      1 bytes):          OKAY
	WRITE (   1024 bytes):          OKAY
	WRITE (   1025 bytes):          OKAY
	WRITE (1024000 bytes):          OKAY
	WRITE (1024001 bytes):          OKAY

	Copy Tests

	COPY (      1 bytes):           OKAY
	COPY (   1024 bytes):           OKAY
	COPY (   1025 bytes):           OKAY
	COPY (1024000 bytes):           OKAY
	COPY (1024001 bytes):           OKAY