arch/s390/pci.rst

1 .. SPDX-License-Identifier: GPL-2.0
8         - Pierre Morel
17 -----------------------
25   Ignore the RID field and force use of one PCI domain per PCI function.
28 ---------------
36   - /sys/kernel/debug/s390dbf/pci_msg/sprintf
52   The slot entries are set up using the function identifier (FID) of the
53   PCI function. The format depicted as XXXXXXXX above is 8 hexadecimal digits
56   - /sys/bus/pci/slots/XXXXXXXX/power
58   A physical function that currently supports a virtual function cannot be
64   - function_id
65     A zPCI function identifier that uniquely identifies the function in the Z server.
67   - function_handle
68     Low-level identifier used for a configured PCI function.
71   - pchid
72     Model-dependent location of the I/O adapter.
74   - pfgid
75     PCI function group ID, functions that share identical functionality
79   - vfn
80     The virtual function number, from 1 to N for virtual functions,
83   - pft
84     The PCI function type
86   - port
87     The port corresponds to the physical port the function is attached to.
88     It also gives an indication of the physical function a virtual function
91   - uid
98   - uid_is_unique
102   - pfip/segmentX
103     The segments determine the isolation of a function.
104     They correspond to the physical path to the function.
110 The PCI address consists of four parts: domain, bus, device and function,
113 * When not using multi-functions (norid is set, or the firmware does not
114   support multi-functions):
116   - There is only one function per domain.
118   - The domain is set from the zPCI function's UID as defined during the
121 * When using multi-functions (norid parameter is not set),
124   - There is still only one bus per domain.
126   - There can be up to 256 functions per bus.
128   - The domain part of the address of all functions for
129     a multi-Function device is set from the zPCI function's UID as defined
130     in the LPAR creation for the function zero.
132   - New functions will only be ready for use after the function zero
133     (the function with devfn 0) has been enumerated.