Merge branch 'for-linus' of git://git.open-osd.org/linux-open-osd

[pandora-kernel.git] / Documentation / scsi / hpsa.txt

diff --git a/Documentation/scsi/hpsa.txt b/Documentation/scsi/hpsa.txt
index 880c085..891435a 100644 (file)
--- 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:
   ------------------------------