cciss: 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: Jens Axboe <jaxboe@fusionio.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/Documentation/ABI/testing/sysfs-bus-pci-devices-cciss b/Documentation/ABI/testing/sysfs-bus-pci-devices-cciss
index 4f29e5f1ebfa..f5bb0a3bb8c0 100644
--- a/Documentation/ABI/testing/sysfs-bus-pci-devices-cciss
+++ b/Documentation/ABI/testing/sysfs-bus-pci-devices-cciss
@@ -59,3 +59,15 @@ Kernel Version: 2.6.31
 Contact:        iss_storagedev@hp.com
 Description:    Displays the usage count (number of opens) of logical drive Y
                 of controller X.
+
+Where:          /sys/bus/pci/devices/<dev>/ccissX/resettable
+Date:           February 2011
+Kernel Version: 2.6.38
+Contact:        iss_storagedev@hp.com
+Description:    Value of 1 indicates the controller can honor the reset_devices
+                kernel parameter.  Value of 0 indicates reset_devices cannot be
+                honored.  This is to allow, for example, kexec tools to be able
+                to warn the user if they designate an unresettable device as
+                a dump device, as kdump requires resetting the device in order
+                to work reliably.
+