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>
diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index 35658f4..eeed7aeb 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -556,6 +556,44 @@
#define to_hba(n) container_of(n, struct ctlr_info, dev)
#define to_drv(n) container_of(n, drive_info_struct, dev)
+/* List of controllers which cannot be reset on kexec with reset_devices */
+static u32 unresettable_controller[] = {
+ 0x324a103C, /* Smart Array P712m */
+ 0x324b103C, /* SmartArray P711m */
+ 0x3223103C, /* Smart Array P800 */
+ 0x3234103C, /* Smart Array P400 */
+ 0x3235103C, /* Smart Array P400i */
+ 0x3211103C, /* Smart Array E200i */
+ 0x3212103C, /* Smart Array E200 */
+ 0x3213103C, /* Smart Array E200i */
+ 0x3214103C, /* Smart Array E200i */
+ 0x3215103C, /* Smart Array E200i */
+ 0x3237103C, /* Smart Array E500 */
+ 0x323D103C, /* Smart Array P700m */
+ 0x409C0E11, /* Smart Array 6400 */
+ 0x409D0E11, /* Smart Array 6400 EM */
+};
+
+static int ctlr_is_resettable(struct ctlr_info *h)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(unresettable_controller); i++)
+ if (unresettable_controller[i] == h->board_id)
+ return 0;
+ return 1;
+}
+
+static ssize_t host_show_resettable(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct ctlr_info *h = to_hba(dev);
+
+ return snprintf(buf, 20, "%d\n", ctlr_is_resettable(h));
+}
+static DEVICE_ATTR(resettable, S_IRUGO, host_show_resettable, NULL);
+
static ssize_t host_store_rescan(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
@@ -741,6 +779,7 @@
static struct attribute *cciss_host_attrs[] = {
&dev_attr_rescan.attr,
+ &dev_attr_resettable.attr,
NULL
};