rds: Provision to allow all trace points at module load time

By default, the RDS module is enabled to print only a subset of
trace prints during module load time. By setting flag 'RDS_RTD_ALL'
in 'rds_rt_debug_bitmap' module param, this patch allows the user
to enable all the logs at module load time.

Note: If debug level is changed without 'RDS_RTD_ALL' bit, then it will
first disable all RDS trace points and enable only bits given in the new
debug bitmap.

Orabug: 35916076

Signed-off-by: Arumugam Kolappan <[email protected]>
Reviewed-by: Alan Maguire <[email protected]>
Reviewed-by: Håkon Bugge <[email protected]>

Author: Arumugam Kolappan

net/rds/af_rds.c

@@ -118,13 +118,21 @@ static struct rt_debug_tp rt_debug_tp_map[] = {
 	    "rds_ib_flow_cntrl_advertise_credits", NULL }},
 	{ RDS_RTD_RDMA_IB,
 	  { "rds_ib_add_device", "rds_ib_remove_device", NULL }},
+	{ RDS_RTD_ALL,
+	  { NULL } },
 };
 
 /* Enable all tracepoints associated with RDS_RTD_ flags that are set. */
 void rds_rt_debug_tp_enable(void)
 {
 	int enable, i, j;
 
+	if (kernel_rds_rt_debug_bitmap & RDS_RTD_ALL) {
+		trace_set_clr_event("rds", NULL, 1);
+		return;
+	}
+
+	trace_set_clr_event("rds", NULL, 0);
 	for (i = 0; i < ARRAY_SIZE(rt_debug_tp_map); i++) {
 		enable = (kernel_rds_rt_debug_bitmap &
 			  rt_debug_tp_map[i].flag) != 0;

net/rds/rds.h

@@ -93,6 +93,7 @@ enum {
 
 	/* bit 20 ~ 31 are module specific bits */
 	RDS_RTD_RDMA_IB			= 1 << 23,	/* 0x800000   */
+	RDS_RTD_ALL			= 1 << 31,	/* Enable All */
 };
 
 /* XXX is there one of these somewhere? */