From 941b1cdae83039c99fc5c1884a98d2afd39760e5 Mon Sep 17 00:00:00 2001 From: "Stephen M. Cameron" Date: Wed, 9 Mar 2011 17:00:06 -0600 Subject: [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 Signed-off-by: James Bottomley --- Documentation/scsi/hpsa.txt | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'Documentation/scsi') diff --git a/Documentation/scsi/hpsa.txt b/Documentation/scsi/hpsa.txt index 880c085b951b..891435a72fce 100644 --- a/Documentation/scsi/hpsa.txt +++ b/Documentation/scsi/hpsa.txt @@ -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: ------------------------------ -- cgit v1.2.3-59-g8ed1b