qeth: Add new s390 debug feature for each qeth card

This patch adds a debug area for each qeth card. This debug area will replace
various other debug areas that are global for all cards handled by the device
driver. On crash dump analysis this makes life easier when trying to find out
what's going on with an interface. Also, the forest of debug areas for this
device driver is significantly cleared up.

Signed-off-by: Carsten Otte <cotte@de.ibm.com>
Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 31 insertions, 3 deletions

diff --git a/drivers/s390/net/qeth_core.h b/drivers/s390/net/qeth_core.h
index 0d078d4e941d..26fa5aa65209 100644
--- a/drivers/s390/net/qeth_core.h
+++ b/drivers/s390/net/qeth_core.h
@@ -73,6 +73,18 @@ struct qeth_dbf_info {
 #define QETH_DBF_TEXT_(name, level, text...) \
         qeth_dbf_longtext(qeth_dbf[QETH_DBF_##name].id, level, text)
 
+#define QETH_CARD_TEXT(card, level, text) \
+        debug_text_event(card->debug, level, text)
+
+#define QETH_CARD_HEX(card, level, addr, len) \
+        debug_event(card->debug, level, (void *)(addr), len)
+
+#define QETH_CARD_MESSAGE(card, text...) \
+        debug_sprintf_event(card->debug, level, text)
+
+#define QETH_CARD_TEXT_(card, level, text...) \
+        qeth_dbf_longtext(card->debug, level, text)
+
 #define SENSE_COMMAND_REJECT_BYTE 0
 #define SENSE_COMMAND_REJECT_FLAG 0x80
 #define SENSE_RESETTING_EVENT_BYTE 1
@@ -738,6 +750,7 @@ struct qeth_card {
         atomic_t force_alloc_skb;
         struct service_level qeth_service_level;
         struct qdio_ssqd_desc ssqd;
+        debug_info_t *debug;
         struct mutex conf_mutex;
 };
 
diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c
index 57770cc3d562..a06a9b79e336 100644
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -4282,6 +4282,7 @@ static int qeth_core_probe_device(struct ccwgroup_device *gdev)
         struct device *dev;
         int rc;
         unsigned long flags;
+        char dbf_name[20];
 
         QETH_DBF_TEXT(SETUP, 2, "probedev");
 
@@ -4297,6 +4298,17 @@ static int qeth_core_probe_device(struct ccwgroup_device *gdev)
                 rc = -ENOMEM;
                 goto err_dev;
         }
+
+        snprintf(dbf_name, sizeof(dbf_name), "qeth_card_%s",
+                dev_name(&gdev->dev));
+        card->debug = debug_register(dbf_name, 2, 1, 8);
+        if (!card->debug) {
+                QETH_DBF_TEXT_(SETUP, 2, "%s", "qcdbf");
+                rc = -ENOMEM;
+                goto err_card;
+        }
+        debug_register_view(card->debug, &debug_hex_ascii_view);
+
         card->read.ccwdev  = gdev->cdev[0];
         card->write.ccwdev = gdev->cdev[1];
         card->data.ccwdev  = gdev->cdev[2];
@@ -4309,12 +4321,12 @@ static int qeth_core_probe_device(struct ccwgroup_device *gdev)
         rc = qeth_determine_card_type(card);
         if (rc) {
                 QETH_DBF_TEXT_(SETUP, 2, "3err%d", rc);
-                goto err_card;
+                goto err_dbf;
         }
         rc = qeth_setup_card(card);
         if (rc) {
                 QETH_DBF_TEXT_(SETUP, 2, "2err%d", rc);
-                goto err_card;
+                goto err_dbf;
         }
 
         if (card->info.type == QETH_CARD_TYPE_OSN)
@@ -4322,7 +4334,7 @@ static int qeth_core_probe_device(struct ccwgroup_device *gdev)
         else
                 rc = qeth_core_create_device_attributes(dev);
         if (rc)
-                goto err_card;
+                goto err_dbf;
         switch (card->info.type) {
         case QETH_CARD_TYPE_OSN:
         case QETH_CARD_TYPE_OSM:
@@ -4352,6 +4364,8 @@ err_attr:
                 qeth_core_remove_osn_attributes(dev);
         else
                 qeth_core_remove_device_attributes(dev);
+err_dbf:
+        debug_unregister(card->debug);
 err_card:
         qeth_core_free_card(card);
 err_dev:
@@ -4375,6 +4389,7 @@ static void qeth_core_remove_device(struct ccwgroup_device *gdev)
         } else {
                 qeth_core_remove_device_attributes(&gdev->dev);
         }
+        debug_unregister(card->debug);
         write_lock_irqsave(&qeth_core_card_list.rwlock, flags);
         list_del(&card->list);
         write_unlock_irqrestore(&qeth_core_card_list.rwlock, flags);