[SCSI] hpsa: Add transport_mode host attribute in /sys

Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

2 files changed, 22 insertions, 1 deletions

diff --git a/Documentation/scsi/hpsa.txt b/Documentation/scsi/hpsa.txt
index b14e6ee00a95..880c085b951b 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*/transport_mode
 
   the host "rescan" attribute is a write only attribute.  Writing to this
   attribute will cause the driver to scan for new, changed, or removed devices
@@ -61,6 +62,10 @@ HPSA specific entries in /sys
         root@host:/sys/class/scsi_host/host4# cat firmware_revision
         7.14
 
+  The transport_mode indicates whether the controller is in "performant"
+  or "simple" mode.  This is controlled by the "hpsa_simple_mode" module
+  parameter.
+
   HPSA specific disk attributes:
   ------------------------------
 
diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
index 66ccacfffd51..563d439c2f46 100644
--- a/drivers/scsi/hpsa.c
+++ b/drivers/scsi/hpsa.c
@@ -161,6 +161,8 @@ static ssize_t host_show_firmware_revision(struct device *dev,
              struct device_attribute *attr, char *buf);
 static ssize_t host_show_commands_outstanding(struct device *dev,
              struct device_attribute *attr, char *buf);
+static ssize_t host_show_transport_mode(struct device *dev,
+        struct device_attribute *attr, char *buf);
 static void hpsa_update_scsi_devices(struct ctlr_info *h, int hostno);
 static ssize_t host_store_rescan(struct device *dev,
          struct device_attribute *attr, const char *buf, size_t count);
@@ -192,6 +194,8 @@ static DEVICE_ATTR(firmware_revision, S_IRUGO,
         host_show_firmware_revision, NULL);
 static DEVICE_ATTR(commands_outstanding, S_IRUGO,
         host_show_commands_outstanding, NULL);
+static DEVICE_ATTR(transport_mode, S_IRUGO,
+        host_show_transport_mode, NULL);
 
 static struct device_attribute *hpsa_sdev_attrs[] = {
         &dev_attr_raid_level,
@@ -204,6 +208,7 @@ static struct device_attribute *hpsa_shost_attrs[] = {
         &dev_attr_rescan,
         &dev_attr_firmware_revision,
         &dev_attr_commands_outstanding,
+        &dev_attr_transport_mode,
         NULL,
 };
 
@@ -313,6 +318,18 @@ static ssize_t host_show_commands_outstanding(struct device *dev,
         return snprintf(buf, 20, "%d\n", h->commands_outstanding);
 }
 
+static ssize_t host_show_transport_mode(struct device *dev,
+        struct device_attribute *attr, char *buf)
+{
+        struct ctlr_info *h;
+        struct Scsi_Host *shost = class_to_shost(dev);
+
+        h = shost_to_hba(shost);
+        return snprintf(buf, 20, "%s\n",
+                h->transMethod == CFGTBL_Trans_Performant ?
+                        "performant" : "simple");
+}
+
 /* Enqueuing and dequeuing functions for cmdlists. */
 static inline void addQ(struct list_head *list, struct CommandList *c)
 {
@@ -3768,7 +3785,6 @@ static int __devinit hpsa_init_one(struct pci_dev *pdev,
         h->pdev = pdev;
         h->busy_initializing = 1;
         h->intr_mode = hpsa_simple_mode ? SIMPLE_MODE_INT : PERF_MODE_INT;
-        printk(KERN_WARNING "hpsa_simple_mode is %d\n", hpsa_simple_mode);
         INIT_LIST_HEAD(&h->cmpQ);
         INIT_LIST_HEAD(&h->reqQ);
         spin_lock_init(&h->lock);