From: Martin Schwidefsky <schwidefsky@de.ibm.com>
To: akpm@osdl.org, linux-kernel@vger.kernel.org
Subject: [patch 2/11] s390: cio documentation.
Date: Wed, 1 Jun 2005 20:02:26 +0200 [thread overview]
Message-ID: <20050601180226.GB6418@localhost.localdomain> (raw)
[patch 2/11] s390: cio documentation.
From: Cornelia Huck <cohuck@de.ibm.com>
Some clarifications in the cio documentation.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diffstat:
Documentation/s390/CommonIO | 16 +++++++++-------
1 files changed, 9 insertions(+), 7 deletions(-)
diff -urpN linux-2.6/Documentation/s390/CommonIO linux-2.6-patched/Documentation/s390/CommonIO
--- linux-2.6/Documentation/s390/CommonIO 2005-03-02 08:38:26.000000000 +0100
+++ linux-2.6-patched/Documentation/s390/CommonIO 2005-06-01 19:43:15.000000000 +0200
@@ -30,7 +30,7 @@ Command line parameters
device numbers (0xabcd or abcd, for 2.4 backward compatibility).
You can use the 'all' keyword to ignore all devices.
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,
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
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
- 0.0.a000-0.0.afff are not known,
+ For example,
"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
- list of ignored devices and skip 0.0.abcd.
+ will add 0.0.a000-0.0.accc and 0.0.af00-0.0.afff to the list of ignored
+ devices.
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).
@@ -98,7 +99,8 @@ Command line parameters
- /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.
+ 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
/proc/s390dbf/cio_*/level a number between 0 and 6; see the documentation on
reply other threads:[~2005-06-01 18:22 UTC|newest]
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