1 S/390 common I/O-Layer - command line parameters and /proc entries
2 ==================================================================
3
4 Command line parameters
5 -----------------------
6
7 * cio_msg = yes | no
8
9 Determines whether information on found devices and sensed device
10 characteristics should be shown during startup, i. e. messages of the types
11 "Detected device 0.0.4711 on subchannel 0.0.0042" and "SenseID: Device
12 0.0.4711 reports: ...".
13
14 Default is off.
15
16
17 * cio_ignore = {all} |
18 {<device> | <range of devices>} |
19 {!<device> | !<range of devices>}
20
21 The given devices will be ignored by the common I/O-layer; no detection
22 and device sensing will be done on any of those devices. The subchannel to
23 which the device in question is attached will be treated as if no device was
24 attached.
25
26 An ignored device can be un-ignored later; see the "/proc entries"-section for
27 details.
28
29 The devices must be given either as bus ids (0.0.abcd) or as hexadecimal
30 device numbers (0xabcd or abcd, for 2.4 backward compatibility).
31 You can use the 'all' keyword to ignore all devices.
32 The '!' operator will cause the I/O-layer to _not_ ignore a device.
33 The command line is parsed from left to right.
34
35 For example,
36 cio_ignore=0.0.0023-0.0.0042,0.0.4711
37 will ignore all devices ranging from 0.0.0023 to 0.0.0042 and the device
38 0.0.4711, if detected.
39 As another example,
40 cio_ignore=all,!0.0.4711,!0.0.fd00-0.0.fd02
41 will ignore all devices but 0.0.4711, 0.0.fd00, 0.0.fd01, 0.0.fd02.
42
43 By default, no devices are ignored.
44
45
46 /proc entries
47 -------------
48
49 * /proc/cio_ignore
50
51 Lists the ranges of devices (by bus id) which are ignored by common I/O.
52
53 You can un-ignore certain or all devices by piping to /proc/cio_ignore.
54 "free all" will un-ignore all ignored devices,
55 "free <device range>, <device range>, ..." will un-ignore the specified
56 devices.
57
58 For example, if devices 0.0.0023 to 0.0.0042 and 0.0.4711 are ignored,
59 - echo free 0.0.0030-0.0.0032 > /proc/cio_ignore
60 will un-ignore devices 0.0.0030 to 0.0.0032 and will leave devices 0.0.0023
61 to 0.0.002f, 0.0.0033 to 0.0.0042 and 0.0.4711 ignored;
62 - echo free 0.0.0041 > /proc/cio_ignore will furthermore un-ignore device
63 0.0.0041;
64 - echo free all > /proc/cio_ignore will un-ignore all remaining ignored
65 devices.
66
67 When a device is un-ignored, device recognition and sensing is performed and
68 the device driver will be notified if possible, so the device will become
69 available to the system.
70
71 You can also add ranges of devices to be ignored by piping to
72 /proc/cio_ignore; "add <device range>, <device range>, ..." will ignore the
73 specified devices.
74
75 Note: While already known devices can be added to the list of devices to be
76 ignored, there will be no effect on then. However, if such a device
77 disappears and then reappeares, it will then be ignored.
78
79 For example,
80 "echo add 0.0.a000-0.0.accc, 0.0.af00-0.0.afff > /proc/cio_ignore"
81 will add 0.0.a000-0.0.accc and 0.0.af00-0.0.afff to the list of ignored
82 devices.
83
84 The devices can be specified either by bus id (0.0.abcd) or, for 2.4 backward
85 compatibilty, by the device number in hexadecimal (0xabcd or abcd).
86
87
88 * /proc/s390dbf/cio_*/ (S/390 debug feature)
89
90 Some views generated by the debug feature to hold various debug outputs.
91
92 - /proc/s390dbf/cio_crw/sprintf
93 Messages from the processing of pending channel report words (machine check
94 handling), which will also show when CONFIG_DEBUG_CRW is defined.
95
96 - /proc/s390dbf/cio_msg/sprintf
97 Various debug messages from the common I/O-layer; generally, messages which
98 will also show when CONFIG_DEBUG_IO is defined.
99
100 - /proc/s390dbf/cio_trace/hex_ascii
101 Logs the calling of functions in the common I/O-layer and, if applicable,
102 which subchannel they were called for, as well as dumps of some data
103 structures (like irb in an error case).
104
105 The level of logging can be changed to be more or less verbose by piping to
106 /proc/s390dbf/cio_*/level a number between 0 and 6; see the documentation on
107 the S/390 debug feature (Documentation/s390/s390dbf.txt) for details.
108
109 * For some of the information present in the /proc filesystem in 2.4 (namely,
110 /proc/subchannels and /proc/chpids), see driver-model.txt.
111 Information formerly in /proc/irq_count is now in /proc/interrupts.
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