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authorCornelia Huck <cohuck@de.ibm.com>2005-06-21 20:16:27 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-06-21 22:07:33 -0400
commit6fd6e4a44ff9ff406bcff69050b508f186507df1 (patch)
tree224b28914a10b8c17b57df60624e0f94366a51b8 /Documentation/s390
parent5bdfcfcc0780f58b927a164dfd54d1e1b6767347 (diff)
[PATCH] s390: cio documentation
Some clarifications in the cio documentation. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'Documentation/s390')
-rw-r--r--Documentation/s390/CommonIO16
1 files changed, 9 insertions, 7 deletions
diff --git a/Documentation/s390/CommonIO b/Documentation/s390/CommonIO
index a831d9ae5a5e..59d1166d41ee 100644
--- a/Documentation/s390/CommonIO
+++ b/Documentation/s390/CommonIO
@@ -30,7 +30,7 @@ Command line parameters
30 device numbers (0xabcd or abcd, for 2.4 backward compatibility). 30 device numbers (0xabcd or abcd, for 2.4 backward compatibility).
31 You can use the 'all' keyword to ignore all devices. 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. 32 The '!' operator will cause the I/O-layer to _not_ ignore a device.
33 The order on the command line is not important. 33 The command line is parsed from left to right.
34 34
35 For example, 35 For example,
36 cio_ignore=0.0.0023-0.0.0042,0.0.4711 36 cio_ignore=0.0.0023-0.0.0042,0.0.4711
@@ -72,13 +72,14 @@ Command line parameters
72 /proc/cio_ignore; "add <device range>, <device range>, ..." will ignore the 72 /proc/cio_ignore; "add <device range>, <device range>, ..." will ignore the
73 specified devices. 73 specified devices.
74 74
75 Note: Already known devices cannot be ignored. 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.
76 78
77 For example, if device 0.0.abcd is already known and all other devices 79 For example,
78 0.0.a000-0.0.afff are not known,
79 "echo add 0.0.a000-0.0.accc, 0.0.af00-0.0.afff > /proc/cio_ignore" 80 "echo add 0.0.a000-0.0.accc, 0.0.af00-0.0.afff > /proc/cio_ignore"
80 will add 0.0.a000-0.0.abcc, 0.0.abce-0.0.accc and 0.0.af00-0.0.afff to the 81 will add 0.0.a000-0.0.accc and 0.0.af00-0.0.afff to the list of ignored
81 list of ignored devices and skip 0.0.abcd. 82 devices.
82 83
83 The devices can be specified either by bus id (0.0.abcd) or, for 2.4 backward 84 The devices can be specified either by bus id (0.0.abcd) or, for 2.4 backward
84 compatibilty, by the device number in hexadecimal (0xabcd or abcd). 85 compatibilty, by the device number in hexadecimal (0xabcd or abcd).
@@ -98,7 +99,8 @@ Command line parameters
98 99
99 - /proc/s390dbf/cio_trace/hex_ascii 100 - /proc/s390dbf/cio_trace/hex_ascii
100 Logs the calling of functions in the common I/O-layer and, if applicable, 101 Logs the calling of functions in the common I/O-layer and, if applicable,
101 which subchannel they were called for. 102 which subchannel they were called for, as well as dumps of some data
103 structures (like irb in an error case).
102 104
103 The level of logging can be changed to be more or less verbose by piping to 105 The level of logging can be changed to be more or less verbose by piping to
104 /proc/s390dbf/cio_*/level a number between 0 and 6; see the documentation on 106 /proc/s390dbf/cio_*/level a number between 0 and 6; see the documentation on