From edc0f494ed966e39e5619be7cdaeb9873e1f4fe1 Mon Sep 17 00:00:00 2001 From: Isaac Hazan Date: Thu, 24 Sep 2020 11:44:02 +0300 Subject: thunderbolt: Add DMA traffic test driver 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//dma_test/packets_to_receive # echo 1000 > /sys/kernel/debug/thunderbolt//dma_test/packets_to_send # echo 1 > /sys/kernel/debug/thunderbolt//dma_test/test # cat /sys/kernel/debug/thunderbolt//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//dma_test/packets_to_receive # echo 1 > /sys/kernel/debug/thunderbolt//dma_test/test The other one for sending: # echo 1000 > /sys/kernel/debug/thunderbolt//dma_test/packets_to_send # echo 1 > /sys/kernel/debug/thunderbolt//dma_test/test Results can be read from both services status attributes. Signed-off-by: Isaac Hazan Signed-off-by: Mika Westerberg Acked-by: Yehezkel Bernat Reviewed-by: Greg Kroah-Hartman --- drivers/thunderbolt/Makefile | 3 +++ 1 file changed, 3 insertions(+) (limited to 'drivers/thunderbolt/Makefile') diff --git a/drivers/thunderbolt/Makefile b/drivers/thunderbolt/Makefile index 571537371072..7aa48f6c41d9 100644 --- a/drivers/thunderbolt/Makefile +++ b/drivers/thunderbolt/Makefile @@ -7,3 +7,6 @@ thunderbolt-objs += nvm.o retimer.o quirks.o thunderbolt-${CONFIG_ACPI} += acpi.o thunderbolt-$(CONFIG_DEBUG_FS) += debugfs.o thunderbolt-${CONFIG_USB4_KUNIT_TEST} += test.o + +thunderbolt_dma_test-${CONFIG_USB4_DMA_TEST} += dma_test.o +obj-$(CONFIG_USB4_DMA_TEST) += thunderbolt_dma_test.o -- cgit