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This driver allows sending DMA traffic over XDomain connection. Specifically over a loopback connection using either a Thunderbolt/USB4 cable that is connected back to the host router port, or a special loopback dongle that has RX and TX lines crossed. This can be useful at manufacturing floor to check whether Thunderbolt/USB4 ports are functional. The driver exposes debugfs directory under the XDomain service that can be used to configure the driver, start the test and check the results. If a loopback dongle is used the steps to send and receive 1000 packets can be done like: # modprobe thunderbolt_dma_test # echo 1000 > /sys/kernel/debug/thunderbolt/<service_id>/dma_test/packets_to_receive # echo 1000 > /sys/kernel/debug/thunderbolt/<service_id>/dma_test/packets_to_send # echo 1 > /sys/kernel/debug/thunderbolt/<service_id>/dma_test/test # cat /sys/kernel/debug/thunderbolt/<service_id>/dma_test/status When a cable is connected back to host then there are two Thunderbolt services, one is configured for receiving (does not matter which one): # modprobe thunderbolt_dma_test # echo 1000 > /sys/kernel/debug/thunderbolt/<service_a>/dma_test/packets_to_receive # echo 1 > /sys/kernel/debug/thunderbolt/<service_a>/dma_test/test The other one for sending: # echo 1000 > /sys/kernel/debug/thunderbolt/<service_b>/dma_test/packets_to_send # echo 1 > /sys/kernel/debug/thunderbolt/<service_b>/dma_test/test Results can be read from both services status attributes. Signed-off-by: Isaac Hazan <isaac.hazan@intel.com> Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Acked-by: Yehezkel Bernat <YehezkelShB@gmail.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
12 lines
537 B
Makefile
12 lines
537 B
Makefile
# SPDX-License-Identifier: GPL-2.0-only
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obj-${CONFIG_USB4} := thunderbolt.o
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thunderbolt-objs := nhi.o nhi_ops.o ctl.o tb.o switch.o cap.o path.o tunnel.o eeprom.o
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thunderbolt-objs += domain.o dma_port.o icm.o property.o xdomain.o lc.o tmu.o usb4.o
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thunderbolt-objs += nvm.o retimer.o quirks.o
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thunderbolt-${CONFIG_ACPI} += acpi.o
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thunderbolt-$(CONFIG_DEBUG_FS) += debugfs.o
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thunderbolt-${CONFIG_USB4_KUNIT_TEST} += test.o
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thunderbolt_dma_test-${CONFIG_USB4_DMA_TEST} += dma_test.o
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obj-$(CONFIG_USB4_DMA_TEST) += thunderbolt_dma_test.o
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