iwlwifi: pcie: add TPT oriented prints

Currently there is no way to debug RX/TX paths using prints
without harming tpt. Add prints to debug RX allocation path.
We can still get 1.9 gbps with those on.

Signed-off-by: Sara Sharon <[email protected]>
Signed-off-by: Luca Coelho <[email protected]>

drivers/net/wireless/intel/iwlwifi/iwl-debug.h

@@ -1,6 +1,7 @@
 /******************************************************************************
  *
  * Copyright(c) 2003 - 2014 Intel Corporation. All rights reserved.
+ * Copyright (C) 2018 Intel Corporation
  *
  * Portions of this file are derived from the ipw3945 project.
  *
@@ -159,7 +160,7 @@ do {                                            			\
 /* 0x000F0000 - 0x00010000 */
 #define IWL_DL_FW		0x00010000
 #define IWL_DL_RF_KILL		0x00020000
-#define IWL_DL_FW_ERRORS	0x00040000
+#define IWL_DL_TPT		0x00040000
 /* 0x00F00000 - 0x00100000 */
 #define IWL_DL_RATE		0x00100000
 #define IWL_DL_CALIB		0x00200000
@@ -193,7 +194,6 @@ do {                                            			\
 #define IWL_DEBUG_CALIB(p, f, a...)	IWL_DEBUG(p, IWL_DL_CALIB, f, ## a)
 #define IWL_DEBUG_FW(p, f, a...)	IWL_DEBUG(p, IWL_DL_FW, f, ## a)
 #define IWL_DEBUG_RF_KILL(p, f, a...)	IWL_DEBUG(p, IWL_DL_RF_KILL, f, ## a)
-#define IWL_DEBUG_FW_ERRORS(p, f, a...)	IWL_DEBUG(p, IWL_DL_FW_ERRORS, f, ## a)
 #define IWL_DEBUG_DROP(p, f, a...)	IWL_DEBUG(p, IWL_DL_DROP, f, ## a)
 #define IWL_DEBUG_DROP_LIMIT(p, f, a...)	\
 		IWL_DEBUG_LIMIT(p, IWL_DL_DROP, f, ## a)
@@ -215,6 +215,7 @@ do {                                            			\
 #define IWL_DEBUG_DEV_RADIO(p, f, a...)	IWL_DEBUG_DEV(p, IWL_DL_RADIO, f, ## a)
 #define IWL_DEBUG_POWER(p, f, a...)	IWL_DEBUG(p, IWL_DL_POWER, f, ## a)
 #define IWL_DEBUG_11H(p, f, a...)	IWL_DEBUG(p, IWL_DL_11H, f, ## a)
+#define IWL_DEBUG_TPT(p, f, a...)	IWL_DEBUG(p, IWL_DL_TPT, f, ## a)
 #define IWL_DEBUG_RPM(p, f, a...)	IWL_DEBUG(p, IWL_DL_RPM, f, ## a)
 #define IWL_DEBUG_LAR(p, f, a...)	IWL_DEBUG(p, IWL_DL_LAR, f, ## a)
 

drivers/net/wireless/intel/iwlwifi/pcie/rx.c

@@ -540,7 +540,7 @@ static void iwl_pcie_rx_allocator(struct iwl_trans *trans)
 	struct list_head local_empty;
 	int pending = atomic_read(&rba->req_pending);
 
-	IWL_DEBUG_RX(trans, "Pending allocation requests = %d\n", pending);
+	IWL_DEBUG_TPT(trans, "Pending allocation requests = %d\n", pending);
 
 	/* If we were scheduled - there is at least one request */
 	spin_lock(&rba->lock);
@@ -598,9 +598,10 @@ static void iwl_pcie_rx_allocator(struct iwl_trans *trans)
 
 		if (!pending) {
 			pending = atomic_read(&rba->req_pending);
-			IWL_DEBUG_RX(trans,
-				     "Got more pending allocation requests = %d\n",
-				     pending);
+			if (pending)
+				IWL_DEBUG_TPT(trans,
+					      "Got more pending allocation requests = %d\n",
+					      pending);
 		}
 
 		spin_lock(&rba->lock);
@@ -619,7 +620,7 @@ static void iwl_pcie_rx_allocator(struct iwl_trans *trans)
 	list_splice_tail(&local_empty, &rba->rbd_empty);
 	spin_unlock(&rba->lock);
 
-	IWL_DEBUG_RX(trans, "%s, exit.\n", __func__);
+	IWL_DEBUG_TPT(trans, "%s, exit.\n", __func__);
 }
 
 /*
@@ -1429,6 +1430,9 @@ static void iwl_pcie_rx_handle(struct iwl_trans *trans, int queue)
 			     !emergency)) {
 			iwl_pcie_rx_move_to_allocator(rxq, rba);
 			emergency = true;
+			IWL_DEBUG_TPT(trans,
+				      "RX path is in emergency. Pending allocations %d\n",
+				      rb_pending_alloc);
 		}
 
 		IWL_DEBUG_RX(trans, "Q %d: HW = %d, SW = %d\n", rxq->id, r, i);
@@ -1458,8 +1462,12 @@ static void iwl_pcie_rx_handle(struct iwl_trans *trans, int queue)
 			count++;
 			if (count == 8) {
 				count = 0;
-				if (rb_pending_alloc < rxq->queue_size / 3)
+				if (rb_pending_alloc < rxq->queue_size / 3) {
+					IWL_DEBUG_TPT(trans,
+						      "RX path exited emergency. Pending allocations %d\n",
+						      rb_pending_alloc);
 					emergency = false;
+				}
 
 				rxq->read = i;
 				spin_unlock(&rxq->lock);