[SCSI] scsi_dh_rdac: changes for rdac debug logging

Patch to add debugging stuff for rdac device handler.
- Added a bit mask "module parameter" rdac_logging with 2 bits for each type
  of logging.
- currently defined only two types of logging(failover and sense logging). Can
  be enhanced later if required.
- By default only failover logging is enabled which is equivalent of current
  logging.

Signed-off-by: Babu Moger <babu.moger@lsi.com>
Reviewed-by: Vijay Chauhan <vijay.chauhan@lsi.com>
Reviewed-by: Bob Stankey <Robert.stankey@lsi.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

1 files changed, 46 insertions, 5 deletions

diff --git a/drivers/scsi/device_handler/scsi_dh_rdac.c b/drivers/scsi/device_handler/scsi_dh_rdac.c
index 9f1c4c2df924..11c89311427e 100644
--- a/drivers/scsi/device_handler/scsi_dh_rdac.c
+++ b/drivers/scsi/device_handler/scsi_dh_rdac.c
@@ -201,6 +201,31 @@ static const char *lun_state[] =
 static LIST_HEAD(ctlr_list);
 static DEFINE_SPINLOCK(list_lock);
 
+/*
+ * module parameter to enable rdac debug logging.
+ * 2 bits for each type of logging, only two types defined for now
+ * Can be enhanced if required at later point
+ */
+static int rdac_logging = 1;
+module_param(rdac_logging, int, S_IRUGO|S_IWUSR);
+MODULE_PARM_DESC(rdac_logging, "A bit mask of rdac logging levels, "
+                "Default is 1 - failover logging enabled, "
+                "set it to 0xF to enable all the logs");
+
+#define RDAC_LOG_FAILOVER       0
+#define RDAC_LOG_SENSE          2
+
+#define RDAC_LOG_BITS           2
+
+#define RDAC_LOG_LEVEL(SHIFT)  \
+        ((rdac_logging >> (SHIFT)) & ((1 << (RDAC_LOG_BITS)) - 1))
+
+#define RDAC_LOG(SHIFT, sdev, f, arg...) \
+do { \
+        if (unlikely(RDAC_LOG_LEVEL(SHIFT))) \
+                sdev_printk(KERN_INFO, sdev, RDAC_NAME ": " f "\n", ## arg); \
+} while (0);
+
 static inline struct rdac_dh_data *get_rdac_data(struct scsi_device *sdev)
 {
         struct scsi_dh_data *scsi_dh_data = sdev->scsi_dh_data;
@@ -469,6 +494,7 @@ static int mode_select_handle_sense(struct scsi_device *sdev,
 {
         struct scsi_sense_hdr sense_hdr;
         int err = SCSI_DH_IO, ret;
+        struct rdac_dh_data *h = get_rdac_data(sdev);
 
         ret = scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE, &sense_hdr);
         if (!ret)
@@ -497,11 +523,14 @@ static int mode_select_handle_sense(struct scsi_device *sdev,
                         err = SCSI_DH_RETRY;
                 break;
         default:
-                sdev_printk(KERN_INFO, sdev,
-                            "MODE_SELECT failed with sense %02x/%02x/%02x.\n",
-                            sense_hdr.sense_key, sense_hdr.asc, sense_hdr.ascq);
+                break;
         }
 
+        RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, "
+                "MODE_SELECT returned with sense %02x/%02x/%02x",
+                (char *) h->ctlr->array_name, h->ctlr->index,
+                sense_hdr.sense_key, sense_hdr.asc, sense_hdr.ascq);
+
 done:
         return err;
 }
@@ -518,7 +547,9 @@ retry:
         if (!rq)
                 goto done;
 
-        sdev_printk(KERN_INFO, sdev, "%s MODE_SELECT command.\n",
+        RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, "
+                "%s MODE_SELECT command",
+                (char *) h->ctlr->array_name, h->ctlr->index,
                 (retry_cnt == RDAC_RETRY_COUNT) ? "queueing" : "retrying");
 
         err = blk_execute_rq(q, NULL, rq, 1);
@@ -528,8 +559,12 @@ retry:
                 if (err == SCSI_DH_RETRY && retry_cnt--)
                         goto retry;
         }
-        if (err == SCSI_DH_OK)
+        if (err == SCSI_DH_OK) {
                 h->state = RDAC_STATE_ACTIVE;
+                RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, "
+                                "MODE_SELECT completed",
+                                (char *) h->ctlr->array_name, h->ctlr->index);
+        }
 
 done:
         return err;
@@ -567,6 +602,12 @@ static int rdac_check_sense(struct scsi_device *sdev,
                                 struct scsi_sense_hdr *sense_hdr)
 {
         struct rdac_dh_data *h = get_rdac_data(sdev);
+
+        RDAC_LOG(RDAC_LOG_SENSE, sdev, "array %s, ctlr %d, "
+                        "I/O returned with sense %02x/%02x/%02x",
+                        (char *) h->ctlr->array_name, h->ctlr->index,
+                        sense_hdr->sense_key, sense_hdr->asc, sense_hdr->ascq);
+
         switch (sense_hdr->sense_key) {
         case NOT_READY:
                 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x01)