[S390] zfcp: Report microcode level through service level interface

Register zfcp with the new /proc/service_level interface to report the
FCP microcode level. When the adapter goes offline or a channel path
disappears, zfcp unregisters, since the microcode version might change
and zfcp does not know about it.

Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

3 files changed, 20 insertions, 2 deletions

diff --git a/drivers/s390/scsi/zfcp_aux.c b/drivers/s390/scsi/zfcp_aux.c
index 3d4e3e3f3fc0..fc4a28953824 100644
--- a/drivers/s390/scsi/zfcp_aux.c
+++ b/drivers/s390/scsi/zfcp_aux.c
@@ -26,6 +26,7 @@
  */
 
 #include <linux/miscdevice.h>
+#include <linux/seq_file.h>
 #include "zfcp_ext.h"
 
 static char *device;
@@ -436,6 +437,16 @@ static void _zfcp_status_read_scheduler(struct work_struct *work)
                                              stat_work));
 }
 
+static void zfcp_print_sl(struct seq_file *m, struct service_level *sl)
+{
+        struct zfcp_adapter *adapter =
+                container_of(sl, struct zfcp_adapter, service_level);
+
+        seq_printf(m, "zfcp: %s microcode level %x\n",
+                   dev_name(&adapter->ccw_device->dev),
+                   adapter->fsf_lic_version);
+}
+
 /**
  * zfcp_adapter_enqueue - enqueue a new adapter to the list
  * @ccw_device: pointer to the struct cc_device
@@ -500,6 +511,8 @@ int zfcp_adapter_enqueue(struct ccw_device *ccw_device)
         INIT_WORK(&adapter->stat_work, _zfcp_status_read_scheduler);
         INIT_WORK(&adapter->scan_work, _zfcp_scan_ports_later);
 
+        adapter->service_level.seq_print = zfcp_print_sl;
+
         /* mark adapter unusable as long as sysfs registration is not complete */
         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
 
diff --git a/drivers/s390/scsi/zfcp_def.h b/drivers/s390/scsi/zfcp_def.h
index 9ce4c75bd190..e19e46ae4a68 100644
--- a/drivers/s390/scsi/zfcp_def.h
+++ b/drivers/s390/scsi/zfcp_def.h
@@ -33,6 +33,7 @@
 #include <asm/qdio.h>
 #include <asm/debug.h>
 #include <asm/ebcdic.h>
+#include <asm/sysinfo.h>
 #include "zfcp_dbf.h"
 #include "zfcp_fsf.h"
 
@@ -515,6 +516,7 @@ struct zfcp_adapter {
         struct fsf_qtcb_bottom_port *stats_reset_data;
         unsigned long           stats_reset;
         struct work_struct      scan_work;
+        struct service_level    service_level;
         atomic_t                qdio_outb_full;    /* queue full incidents */
 };
 
diff --git a/drivers/s390/scsi/zfcp_erp.c b/drivers/s390/scsi/zfcp_erp.c
index c557ba34e1aa..174d29ce2a69 100644
--- a/drivers/s390/scsi/zfcp_erp.c
+++ b/drivers/s390/scsi/zfcp_erp.c
@@ -1281,10 +1281,13 @@ static void zfcp_erp_action_cleanup(struct zfcp_erp_action *act, int result)
                 break;
 
         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
-                if (result != ZFCP_ERP_SUCCEEDED)
+                if (result != ZFCP_ERP_SUCCEEDED) {
+                        unregister_service_level(&adapter->service_level);
                         zfcp_erp_rports_del(adapter);
-                else
+                } else {
+                        register_service_level(&adapter->service_level);
                         schedule_work(&adapter->scan_work);
+                }
                 zfcp_adapter_put(adapter);
                 break;
         }