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The limited number of link-encryption (IDE) streams that a given set of host bridges supports is a platform specific detail. Provide pci_ide_init_nr_streams() as a generic facility for either platform TSM drivers, or PCI core native IDE, to report the number available streams. After invoking pci_ide_init_nr_streams() an "available_secure_streams" attribute appears in PCI host bridge sysfs to convey that count. Introduce a device-type, @pci_host_bridge_type, now that both a release method and sysfs attribute groups are being specified for all 'struct pci_host_bridge' instances. Cc: Bjorn Helgaas <bhelgaas@google.com> Cc: Lukas Wunner <lukas@wunner.de> Cc: Samuel Ortiz <sameo@rivosinc.com> Cc: Alexey Kardashevskiy <aik@amd.com> Cc: Xu Yilun <yilun.xu@linux.intel.com> Acked-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com> Link: https://patch.msgid.link/20251031212902.2256310-9-dan.j.williams@intel.com Signed-off-by: Dan Williams <dan.j.williams@intel.com>
46 lines
2.0 KiB
Plaintext
46 lines
2.0 KiB
Plaintext
What: /sys/devices/pciDDDD:BB
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/sys/devices/.../pciDDDD:BB
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Contact: linux-pci@vger.kernel.org
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Description:
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A PCI host bridge device parents a PCI bus device topology. PCI
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controllers may also parent host bridges. The DDDD:BB format
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conveys the PCI domain (ACPI segment) number and root bus number
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(in hexadecimal) of the host bridge. Note that the domain number
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may be larger than the 16-bits that the "DDDD" format implies
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for emulated host-bridges.
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What: pciDDDD:BB/firmware_node
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Contact: linux-pci@vger.kernel.org
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Description:
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(RO) Symlink to the platform firmware device object "companion"
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of the host bridge. For example, an ACPI device with an _HID of
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PNP0A08 (/sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00). See
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/sys/devices/pciDDDD:BB entry for details about the DDDD:BB
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format.
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What: pciDDDD:BB/streamH.R.E
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Contact: linux-pci@vger.kernel.org
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Description:
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(RO) When a platform has established a secure connection, PCIe
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IDE, between two Partner Ports, this symlink appears. A stream
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consumes a Stream ID slot in each of the Host bridge (H), Root
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Port (R) and Endpoint (E). The link points to the Endpoint PCI
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device in the Selective IDE Stream pairing. Specifically, "R"
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and "E" represent the assigned Selective IDE Stream Register
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Block in the Root Port and Endpoint, and "H" represents a
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platform specific pool of stream resources shared by the Root
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Ports in a host bridge. See /sys/devices/pciDDDD:BB entry for
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details about the DDDD:BB format.
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What: pciDDDD:BB/available_secure_streams
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Contact: linux-pci@vger.kernel.org
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Description:
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(RO) When a host bridge has Root Ports that support PCIe IDE
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(link encryption and integrity protection) there may be a
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limited number of Selective IDE Streams that can be used for
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establishing new end-to-end secure links. This attribute
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decrements upon secure link setup, and increments upon secure
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link teardown. The in-use stream count is determined by counting
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stream symlinks. See /sys/devices/pciDDDD:BB entry for details
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about the DDDD:BB format.
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