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Diffstat (limited to 'drivers/thunderbolt/Kconfig')
| -rw-r--r-- | drivers/thunderbolt/Kconfig | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/thunderbolt/Kconfig b/drivers/thunderbolt/Kconfig index 0abdb69ee9f4..8bf4ecf7f76e 100644 --- a/drivers/thunderbolt/Kconfig +++ b/drivers/thunderbolt/Kconfig @@ -18,6 +18,24 @@ menuconfig USB4 if USB4 +config USB4_PCIE_TUNNELING + bool "Allow PCI Express tunneling over USB4 fabric" + depends on PCI + default y + help + USB4 and Thunderbolt devices typically include PCIe switch + with a number of PCIe endpoints such as USB host controllers, + GPUs and network adapters. These are made available to the + host system through PCIe tunneling. These can use DMA and + therefore have access to the host memory which is typically + guarded by an IOMMU. This option allows disabling PCIe + tunneling completely. + + For devices to be usable it is recommended to say Y here. + + Note this only works with systems that use Software Based + Connection Manager (this is most USB4 hosts). + config USB4_DEBUGFS_WRITE bool "Enable write by debugfs to configuration spaces (DANGEROUS)" help |