[SCSI] hpsa: export resettable host attribute
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>
diff --git a/Documentation/scsi/hpsa.txt b/Documentation/scsi/hpsa.txt
index 880c085..891435a 100644
--- a/Documentation/scsi/hpsa.txt
+++ b/Documentation/scsi/hpsa.txt
@@ -45,6 +45,7 @@
/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 @@
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:
------------------------------