mt76: mt7615: add tracing support

Introduce token tracing support in mt7615_mac_tx_free routine

Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt7615/Makefile

@@ -2,5 +2,7 @@
 
 obj-$(CONFIG_MT7615E) += mt7615e.o
 
+CFLAGS_trace.o := -I$(src)
+
 mt7615e-y := pci.o init.o dma.o eeprom.o main.o mcu.o mac.o \
-	     debugfs.o
+	     debugfs.o trace.o

drivers/net/wireless/mediatek/mt76/mt7615/mac.c

@@ -12,6 +12,7 @@
 #include "mt7615.h"
 #include "../trace.h"
 #include "../dma.h"
+#include "mt7615_trace.h"
 #include "mac.h"
 
 #define to_rssi(field, rxv)		((FIELD_GET(field, rxv) - 220) / 2)
@@ -1300,13 +1301,17 @@ void mt7615_mac_tx_free(struct mt7615_dev *dev, struct sk_buff *skb)
 
 	count = FIELD_GET(MT_TX_FREE_MSDU_ID_CNT, le16_to_cpu(free->ctrl));
 	for (i = 0; i < count; i++) {
+		u16 token = le16_to_cpu(free->token[i]);
+
 		spin_lock_bh(&dev->token_lock);
-		txwi = idr_remove(&dev->token, le16_to_cpu(free->token[i]));
+		txwi = idr_remove(&dev->token, token);
 		spin_unlock_bh(&dev->token_lock);
 
 		if (!txwi)
 			continue;
 
+		trace_mac_tx_free(dev, token);
+
 		mt7615_txp_skb_unmap(mdev, txwi);
 		if (txwi->skb) {
 			mt76_tx_complete_skb(mdev, txwi->skb);

drivers/net/wireless/mediatek/mt76/mt7615/mt7615_trace.h

+/* SPDX-License-Identifier: ISC */
+/*
+ * Copyright (C) 2019 Lorenzo Bianconi <lorenzo@kernel.org>
+ */
+
+#if !defined(__MT7615_TRACE_H) || defined(TRACE_HEADER_MULTI_READ)
+#define __MT7615_TRACE_H
+
+#include <linux/tracepoint.h>
+#include "mt7615.h"
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM mt7615
+
+#define MAXNAME		32
+#define DEV_ENTRY	__array(char, wiphy_name, 32)
+#define DEV_ASSIGN	strlcpy(__entry->wiphy_name,	\
+				wiphy_name(mt76_hw(dev)->wiphy), MAXNAME)
+#define DEV_PR_FMT	"%s"
+#define DEV_PR_ARG	__entry->wiphy_name
+
+#define TOKEN_ENTRY	__field(u16, token)
+#define TOKEN_ASSIGN	__entry->token = token
+#define TOKEN_PR_FMT	" %d"
+#define TOKEN_PR_ARG	__entry->token
+
+DECLARE_EVENT_CLASS(dev_token,
+	TP_PROTO(struct mt7615_dev *dev, u16 token),
+	TP_ARGS(dev, token),
+	TP_STRUCT__entry(
+		DEV_ENTRY
+		TOKEN_ENTRY
+	),
+	TP_fast_assign(
+		DEV_ASSIGN;
+		TOKEN_ASSIGN;
+	),
+	TP_printk(
+		DEV_PR_FMT TOKEN_PR_FMT,
+		DEV_PR_ARG, TOKEN_PR_ARG
+	)
+);
+
+DEFINE_EVENT(dev_token, mac_tx_free,
+	TP_PROTO(struct mt7615_dev *dev, u16 token),
+	TP_ARGS(dev, token)
+);
+
+#endif
+
+#undef TRACE_INCLUDE_PATH
+#define TRACE_INCLUDE_PATH .
+#undef TRACE_INCLUDE_FILE
+#define TRACE_INCLUDE_FILE mt7615_trace
+
+#include <trace/define_trace.h>

drivers/net/wireless/mediatek/mt76/mt7615/trace.c

+// SPDX-License-Identifier: ISC
+/*
+ * Copyright (C) 2019 Lorenzo Bianconi <lorenzo@kernel.org>
+ */
+
+#include <linux/module.h>
+
+#ifndef __CHECKER__
+#define CREATE_TRACE_POINTS
+#include "mt7615_trace.h"
+
+#endif