CommonIO
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- S/390 common I/O-Layer - command line parameters and /proc entries
- ==================================================================
- Command line parameters
- -----------------------
- * cio_msg = yes | no
-
- Determines whether information on found devices and sensed device
- characteristics should be shown during startup, i. e. messages of the types
- "Detected device 4711 on subchannel 42" and "SenseID: Device 4711 reports: ...".
- Default is off.
- * cio_notoper_msg = yes | no
- Determines whether messages of the type "Device 4711 became 'not operational'"
- should be shown during startup; after startup, they will always be shown.
-
- Default is on.
- * cio_ignore = <range of device numbers>, <range of device numbers>, ...
- The given device numbers will be ignored by the common I/O-layer; no detection
- and device sensing will be done on any of those devices. The subchannel to
- which the device in question is attached will be treated as if no device was
- attached.
- An ignored device can be un-ignored later; see the "/proc entries"-section for
- details.
- The device numbers must be given hexadecimal.
- For example,
- cio_ignore=0x23-0x42,0x4711
- will ignore all devices with device numbers ranging from 23 to 42 and the
- device with device number 4711, if detected.
- By default, no devices are ignored.
- * cio_proc_devinfo = yes | no
- Determines whether the entries under /proc/deviceinfo/ (see below) should be
- created. Since there are problems with systems with many devices attached, I
- made it configurable.
- Until the problems are dealt with, default is off.
- /proc entries
- -------------
- * /proc/subchannels
- Shows for each subchannel
- - device number
- - device type/model and if applicable control unit type/model
- - whether the device is in use
- - path installed mask, path available mask, path operational mask and last
- path used mask
- - the channel path IDs (chpids)
- * /proc/deviceinfo/
- Shows in subdirectories for each device some characteristics:
- - /proc/deviceinfo/<devno>/chpids:
- the channel path IDs
- - /proc/deviceinfo/<devno>/in_use:
- whether the device is in use
- - /proc/deviceinfo/<devno>/sensedata:
- the device type/model and if applicable control unit type/model of the
- device
- NOTE: Since the number of inodes which can be dynamically allocated by procfs
- is limited, device entries will only be created up to a magic number of
- devices. The kernel will utter a warning that not all entries can be
- created. In this case, you shouldn't use "cio_proc_devinfo=yes" (see
- above).
- * /proc/cio_ignore
- Lists the ranges of device numbers which are ignored by common I/O.
- You can un-ignore certain or all devices by piping to /proc/cio_ignore.
- "free all" will un-ignore all ignored devices,
- "free <devnorange>, <devnorange>, ..." will un-ignore the specified devices.
- For example, if devices 23 to 42 and 4711 are ignored,
- - echo free 0x30-0x32 > /proc/cio_ignore
- will un-ignore devices 30 to 32 and will leave devices 23 to 2F, 33 to 42
- and 4711 ignored;
- - echo free 0x41 > /proc/cio_ignore will furthermore un-ignore device 41;
- - echo free all > /proc/cio_ignore will un-ignore all remaining ignored
- devices.
- When a device is un-ignored, device recognition and sensing is performed and
- the device driver will be notified if possible, so the device will become
- available to the system.
- You can also add ranges of devices to be ignored by piping to
- /proc/cio_ignore; "add <devnorange>, <devnorange>, ..." will ignore the
- specified devices.
- Note: Already known devices cannot be ignored; this also applies to devices
- which are gone after a machine check.
- For example, if device abcd is already known and all other devices a000-afff
- are not known, "echo add 0xa000-0xaccc, 0xaf00-0xafff > /proc/cio_ignore"
- will add af00-afff to the list of ignored devices and skip a000-accc.
- * /proc/s390dbf/cio_*/ (S/390 debug feature)
- Some views generated by the debug feature to hold various debug outputs.
- - /proc/s390dbf/cio_crw/sprintf
- Messages from the processing of pending channel report words (machine check
- handling), which will also show when CONFIG_DEBUG_CRW is defined.
- - /proc/s390dbf/cio_msg/sprintf
- Various debug messages from the common I/O-layer; generally, messages which
- will also show when CONFIG_DEBUG_IO is defined.
- - /proc/s390dbf/cio_trace/hex_ascii
- Logs the calling of functions in the common I/O-layer and, if applicable,
- which subchannel they were called for.
- The level of logging can be changed to be more or less verbose by piping to
- /proc/s390dbf/cio_*/level a number between 0 and 6; see the documentation on
- the S/390 debug feature (Documentation/s390/s390dbf.txt) for details.
- * /proc/irq_count
- This entry counts how many times s390_process_IRQ has been called for each
- CPU. This info is in /proc/interrupts on other architectures.