mirror of
https://github.com/torvalds/linux.git
synced 2024-12-09 20:51:43 +00:00
edc0f494ed
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>
48 lines
1.5 KiB
Plaintext
48 lines
1.5 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0-only
|
|
menuconfig USB4
|
|
tristate "Unified support for USB4 and Thunderbolt"
|
|
depends on PCI
|
|
select APPLE_PROPERTIES if EFI_STUB && X86
|
|
select CRC32
|
|
select CRYPTO
|
|
select CRYPTO_HASH
|
|
select NVMEM
|
|
help
|
|
USB4 and Thunderbolt driver. USB4 is the public specification
|
|
based on the Thunderbolt 3 protocol. This driver is required if
|
|
you want to hotplug Thunderbolt and USB4 compliant devices on
|
|
Apple hardware or on PCs with Intel Falcon Ridge or newer.
|
|
|
|
To compile this driver a module, choose M here. The module will be
|
|
called thunderbolt.
|
|
|
|
if USB4
|
|
|
|
config USB4_DEBUGFS_WRITE
|
|
bool "Enable write by debugfs to configuration spaces (DANGEROUS)"
|
|
help
|
|
Enables writing to device configuration registers through
|
|
debugfs interface.
|
|
|
|
Only enable this if you know what you are doing! Never enable
|
|
this for production systems or distro kernels.
|
|
|
|
config USB4_KUNIT_TEST
|
|
bool "KUnit tests"
|
|
depends on KUNIT=y
|
|
|
|
config USB4_DMA_TEST
|
|
tristate "DMA traffic test driver"
|
|
depends on DEBUG_FS
|
|
help
|
|
This allows sending and receiving DMA traffic through loopback
|
|
connection. Loopback connection can be done by either special
|
|
dongle that has TX/RX lines crossed, or by simply connecting a
|
|
cable back to the host. Only enable this if you know what you
|
|
are doing. Normal users and distro kernels should say N here.
|
|
|
|
To compile this driver a module, choose M here. The module will be
|
|
called thunderbolt_dma_test.
|
|
|
|
endif # USB4
|