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[PATCH] s390: cio documentation

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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>
This commit is contained in:
Cornelia Huck 2005-06-21 17:16:27 -07:00 committed by Linus Torvalds
parent 5bdfcfcc07
commit 6fd6e4a44f
1 changed files with 9 additions and 7 deletions
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16
Documentation/s390/CommonIO
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@ -30,7 +30,7 @@ Command line parameters
device numbers (0xabcd or abcd, for 2.4 backward compatibility). device numbers (0xabcd or abcd, for 2.4 backward compatibility).
You can use the 'all' keyword to ignore all devices. You can use the 'all' keyword to ignore all devices.
The '!' operator will cause the I/O-layer to _not_ ignore a device. The '!' operator will cause the I/O-layer to _not_ ignore a device.
The order on the command line is not important. The command line is parsed from left to right.
For example, For example,
cio_ignore=0.0.0023-0.0.0042,0.0.4711 cio_ignore=0.0.0023-0.0.0042,0.0.4711
@ -72,13 +72,14 @@ Command line parameters
/proc/cio_ignore; "add <device range>, <device range>, ..." will ignore the /proc/cio_ignore; "add <device range>, <device range>, ..." will ignore the
specified devices. specified devices.
Note: Already known devices cannot be ignored. Note: While already known devices can be added to the list of devices to be
ignored, there will be no effect on then. However, if such a device
disappears and then reappeares, it will then be ignored.
For example, if device 0.0.abcd is already known and all other devices For example,
0.0.a000-0.0.afff are not known,
"echo add 0.0.a000-0.0.accc, 0.0.af00-0.0.afff > /proc/cio_ignore" "echo add 0.0.a000-0.0.accc, 0.0.af00-0.0.afff > /proc/cio_ignore"
will add 0.0.a000-0.0.abcc, 0.0.abce-0.0.accc and 0.0.af00-0.0.afff to the will add 0.0.a000-0.0.accc and 0.0.af00-0.0.afff to the list of ignored
list of ignored devices and skip 0.0.abcd. devices.
The devices can be specified either by bus id (0.0.abcd) or, for 2.4 backward The devices can be specified either by bus id (0.0.abcd) or, for 2.4 backward
compatibilty, by the device number in hexadecimal (0xabcd or abcd). compatibilty, by the device number in hexadecimal (0xabcd or abcd).
@ -98,7 +99,8 @@ Command line parameters
- /proc/s390dbf/cio_trace/hex_ascii - /proc/s390dbf/cio_trace/hex_ascii
Logs the calling of functions in the common I/O-layer and, if applicable, Logs the calling of functions in the common I/O-layer and, if applicable,
which subchannel they were called for. which subchannel they were called for, as well as dumps of some data
structures (like irb in an error case).
The level of logging can be changed to be more or less verbose by piping to 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 /proc/s390dbf/cio_*/level a number between 0 and 6; see the documentation on