arch/s390/pci.rst

1 .. SPDX-License-Identifier: GPL-2.0
4 S/390 PCI
8         - Pierre Morel
17 -----------------------
21   Do not use PCI Mapped I/O (MIO) instructions.
25   Ignore the RID field and force use of one PCI domain per PCI function.
28 ---------------
36   - /sys/kernel/debug/s390dbf/pci_msg/sprintf
37     Holds messages from the processing of PCI events, like machine check handling
50 * /sys/bus/pci/slots/XXXXXXXX
53   PCI function. The format depicted as XXXXXXXX above is 8 hexadecimal digits
56   - /sys/bus/pci/slots/XXXXXXXX/power
60   echo 0 > /sys/bus/pci/devices/XXXX:XX:XX.X/sriov_numvf
62 * /sys/bus/pci/devices/XXXX:XX:XX.X/
64   - function_id
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
77     A PCI group defines interrupts, IOMMU, IOTLB, and DMA specifics.
79   - vfn
83   - pft
84     The PCI function type
86   - port
91   - uid
98   - uid_is_unique
102   - pfip/segmentX
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
132   - New functions will only be ready for use after the function zero