cciss: add transport mode attribute to sys

Signed-off-by: Joseph Handzik <joseph.t.handzik@beardog.cce.hp.com>
Acked-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>

diff --git a/Documentation/ABI/testing/sysfs-bus-pci-devices-cciss b/Documentation/ABI/testing/sysfs-bus-pci-devices-cciss
index f5bb0a3..53d99ed 100644 (file)
--- a/Documentation/ABI/testing/sysfs-bus-pci-devices-cciss
+++ b/Documentation/ABI/testing/sysfs-bus-pci-devices-cciss
@@ -71,3 +71,10 @@ Description: Value of 1 indicates the controller can honor the reset_devices
                a dump device, as kdump requires resetting the device in order
                to work reliably.
 
+Where:         /sys/bus/pci/devices/<dev>/ccissX/transport_mode
+Date:          July 2011
+Kernel Version:        3.0
+Contact:       iss_storagedev@hp.com
+Description:   Value of "simple" indicates that the controller has been placed
+               in "simple mode". Value of "performant" indicates that the
+               controller has been placed in "performant mode".

diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index 61f0b5b..6da7ede 100644 (file)
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -641,6 +641,18 @@ static ssize_t host_store_rescan(struct device *dev,
 }
 static DEVICE_ATTR(rescan, S_IWUSR, NULL, host_store_rescan);
 
+static ssize_t host_show_transport_mode(struct device *dev,
+                                struct device_attribute *attr,
+                                char *buf)
+{
+       struct ctlr_info *h = to_hba(dev);
+
+       return snprintf(buf, 20, "%s\n",
+               h->transMethod & CFGTBL_Trans_Performant ?
+                       "performant" : "simple");
+}
+static DEVICE_ATTR(transport_mode, S_IRUGO, host_show_transport_mode, NULL);
+
 static ssize_t dev_show_unique_id(struct device *dev,
                                 struct device_attribute *attr,
                                 char *buf)
@@ -813,6 +825,7 @@ static DEVICE_ATTR(usage_count, S_IRUGO, cciss_show_usage_count, NULL);
 static struct attribute *cciss_host_attrs[] = {
        &dev_attr_rescan.attr,
        &dev_attr_resettable.attr,
+       &dev_attr_transport_mode.attr,
        NULL
 };