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[SCSI] hpsa: export resettable host attribute

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This attribute, requested by Redhat, allows kexec-tools to know
whether the controller can honor the reset_devices kernel parameter
and actually reset the controller.  For kdump to work properly it
is necessary that the reset_devices parameter be honored.  This
attribute enables kexec-tools to warn the user if they attempt to
designate a non-resettable controller as the dump device.

Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
Stephen M. Cameron
2011-03-09 17:00:06 -06:00
committed by James Bottomley
parent 3f5eac3a04
commit 941b1cdae8
2 changed files with 53 additions and 0 deletions
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12
Documentation/scsi/hpsa.txt
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@ -45,6 +45,7 @@ HPSA specific entries in /sys
/sys/class/scsi_host/host*/rescan
/sys/class/scsi_host/host*/firmware_revision
/sys/class/scsi_host/host*/resettable
/sys/class/scsi_host/host*/transport_mode
the host "rescan" attribute is a write only attribute. Writing to this
@ -66,6 +67,17 @@ HPSA specific entries in /sys
or "simple" mode. This is controlled by the "hpsa_simple_mode" module
parameter.
The "resettable" read-only attribute indicates whether a particular
controller is able to honor the "reset_devices" kernel parameter. If the
device is resettable, this file will contain a "1", otherwise, a "0". This
parameter is used by kdump, for example, to reset the controller at driver
load time to eliminate any outstanding commands on the controller and get the
controller into a known state so that the kdump initiated i/o will work right
and not be disrupted in any way by stale commands or other stale state
remaining on the controller from the previous kernel. This attribute enables
kexec tools to warn the user if they attempt to designate a device which is
unable to honor the reset_devices kernel parameter as a dump device.
HPSA specific disk attributes:
------------------------------