[SCSI] qla2xxx: Basic infrastructure for dynamic logging.

This patch adds the dynamic logging framework to the qla2xxx driver.
The user will be able to change the logging levels on the fly i.e.
without load/unload of the driver. This also enables logging to be
enabled for a particular section of the driver such as initialization,
device discovery etc.

Signed-off-by: Saurav Kashyap <saurav.kashyap@qlogic.com>
Signed-off-by: Giridhar Malavali <giridhar.malavali@qlogic.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

1 files changed, 15 insertions, 2 deletions

diff --git a/drivers/scsi/qla2xxx/qla_os.c b/drivers/scsi/qla2xxx/qla_os.c
index f461925a9dfc..8aa05c87b653 100644
--- a/drivers/scsi/qla2xxx/qla_os.c
+++ b/drivers/scsi/qla2xxx/qla_os.c
@@ -35,6 +35,10 @@ static struct kmem_cache *srb_cachep;
  * CT6 CTX allocation cache
  */
 static struct kmem_cache *ctx_cachep;
+/*
+ * error level for logging
+ */
+int ql_errlev = ql_log_all;
 
 int ql2xlogintimeout = 20;
 module_param(ql2xlogintimeout, int, S_IRUGO);
@@ -69,8 +73,17 @@ MODULE_PARM_DESC(ql2xallocfwdump,
 int ql2xextended_error_logging;
 module_param(ql2xextended_error_logging, int, S_IRUGO|S_IWUSR);
 MODULE_PARM_DESC(ql2xextended_error_logging,
-                "Option to enable extended error logging, "
-                "Default is 0 - no logging. 1 - log errors.");
+                "Option to enable extended error logging,\n"
+                "\t\tDefault is 0 - no logging.  0x40000000 - Module Init & Probe.\n"
+                "\t\t0x20000000 - Mailbox Cmnds. 0x10000000 - Device Discovery.\n"
+                "\t\t0x08000000 - IO tracing.    0x04000000 - DPC Thread.\n"
+                "\t\t0x02000000 - Async events.  0x01000000 - Timer routines.\n"
+                "\t\t0x00800000 - User space.    0x00400000 - Task Management.\n"
+                "\t\t0x00200000 - AER/EEH.       0x00100000 - Multi Q.\n"
+                "\t\t0x00080000 - P3P Specific.  0x00040000 - Virtual Port.\n"
+                "\t\t0x00020000 - Buffer Dump.   0x00010000 - Misc.\n"
+                "\t\t0x7fffffff - For enabling all logs, can be too many logs.\n"
+                "\t\tDo LOGICAL OR of the value to enable more than one level");
 
 int ql2xshiftctondsd = 6;
 module_param(ql2xshiftctondsd, int, S_IRUGO);