1What: /sys/devices/pciDDDD:BB 2 /sys/devices/.../pciDDDD:BB 3Contact: linux-pci@vger.kernel.org 4Description: 5 A PCI host bridge device parents a PCI bus device topology. PCI 6 controllers may also parent host bridges. The DDDD:BB format 7 conveys the PCI domain (ACPI segment) number and root bus number 8 (in hexadecimal) of the host bridge. Note that the domain number 9 may be larger than the 16-bits that the "DDDD" format implies 10 for emulated host-bridges. 11 12What: pciDDDD:BB/firmware_node 13Contact: linux-pci@vger.kernel.org 14Description: 15 (RO) Symlink to the platform firmware device object "companion" 16 of the host bridge. For example, an ACPI device with an _HID of 17 PNP0A08 (/sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00). See 18 /sys/devices/pciDDDD:BB entry for details about the DDDD:BB 19 format. 20 21What: pciDDDD:BB/streamH.R.E 22Contact: linux-pci@vger.kernel.org 23Description: 24 (RO) When a platform has established a secure connection, PCIe 25 IDE, between two Partner Ports, this symlink appears. A stream 26 consumes a Stream ID slot in each of the Host bridge (H), Root 27 Port (R) and Endpoint (E). The link points to the Endpoint PCI 28 device in the Selective IDE Stream pairing. Specifically, "R" 29 and "E" represent the assigned Selective IDE Stream Register 30 Block in the Root Port and Endpoint, and "H" represents a 31 platform specific pool of stream resources shared by the Root 32 Ports in a host bridge. See /sys/devices/pciDDDD:BB entry for 33 details about the DDDD:BB format. 34 35What: pciDDDD:BB/available_secure_streams 36Contact: linux-pci@vger.kernel.org 37Description: 38 (RO) When a host bridge has Root Ports that support PCIe IDE 39 (link encryption and integrity protection) there may be a 40 limited number of Selective IDE Streams that can be used for 41 establishing new end-to-end secure links. This attribute 42 decrements upon secure link setup, and increments upon secure 43 link teardown. The in-use stream count is determined by counting 44 stream symlinks. See /sys/devices/pciDDDD:BB entry for details 45 about the DDDD:BB format. 46