staging: brcm80211: softmac: added event tracing

Dpc and timer events can now be traced. Combined with Mac80211
driver callback tracing, all entry points into the driver can now
be traced.

Reported-by: Johannes Berg <johannes@sipsolutions.net>
Reviewed-by: Pieter-Paul Giesberts <pieterpg@broadcom.com>
Reviewed-by: Alwin Beukers <alwin@broadcom.com>
Reviewed-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/brcm80211/brcmsmac/Makefile

@@ -42,7 +42,8 @@ BRCMSMAC_OFILES := \
 	otp.o \
 	srom.o \
 	dma.o \
-	nicpci.o
+	nicpci.o \
+	brcms_trace_events.o
 
 MODULEPFX := brcmsmac
 

drivers/staging/brcm80211/brcmsmac/brcms_trace_events.c

@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) 2011 Broadcom Corporation
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+ * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <linux/module.h> /* bug in tracepoint.h, it should include this */
+
+#ifndef __CHECKER__
+#include "mac80211_if.h"
+#define CREATE_TRACE_POINTS
+#include "brcms_trace_events.h"
+#endif

drivers/staging/brcm80211/brcmsmac/brcms_trace_events.h

@@ -0,0 +1,92 @@
+/*
+ * Copyright (c) 2011 Broadcom Corporation
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+ * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM brcmsmac
+
+#if !defined(__TRACE_BRCMSMAC_H) || defined(TRACE_HEADER_MULTI_READ)
+
+#define __TRACE_BRCMSMAC_H
+
+#include <linux/tracepoint.h>
+#include "mac80211_if.h"
+
+#ifndef CONFIG_BRCMDBG
+#undef TRACE_EVENT
+#define TRACE_EVENT(name, proto, ...) \
+static inline void trace_ ## name(proto) {}
+#endif
+
+/*
+ * We define a tracepoint, its arguments, its printk format and its
+ * 'fast binary record' layout.
+ */
+TRACE_EVENT(brcms_timer,
+	/* TPPROTO is the prototype of the function called by this tracepoint */
+	TP_PROTO(struct brcms_timer *t),
+	/*
+	 * TPARGS(firstarg, p) are the parameters names, same as found in the
+	 * prototype.
+	 */
+	TP_ARGS(t),
+	/*
+	 * Fast binary tracing: define the trace record via TP_STRUCT__entry().
+	 * You can think about it like a regular C structure local variable
+	 * definition.
+	 */
+	TP_STRUCT__entry(
+		__field(uint, ms)
+		__field(uint, set)
+		__field(uint, periodic)
+	),
+	TP_fast_assign(
+		__entry->ms = t->ms;
+		__entry->set = t->set;
+		__entry->periodic = t->periodic;
+	),
+	TP_printk(
+		"ms=%u set=%u periodic=%u",
+		__entry->ms, __entry->set, __entry->periodic
+	)
+);
+
+TRACE_EVENT(brcms_dpc,
+	TP_PROTO(unsigned long data),
+	TP_ARGS(data),
+	TP_STRUCT__entry(
+		__field(unsigned long, data)
+	),
+	TP_fast_assign(
+		__entry->data = data;
+	),
+	TP_printk(
+		"data=%p",
+		(void *)__entry->data
+	)
+);
+
+#endif /* __TRACE_BRCMSMAC_H */
+
+#ifdef CONFIG_BRCMDBG
+
+#undef TRACE_INCLUDE_PATH
+#define TRACE_INCLUDE_PATH .
+#undef TRACE_INCLUDE_FILE
+#define TRACE_INCLUDE_FILE brcms_trace_events
+
+#include <trace/define_trace.h>
+
+#endif /* CONFIG_BRCMDBG */

drivers/staging/brcm80211/brcmsmac/mac80211_if.c

@@ -750,7 +750,7 @@ static int brcms_set_hint(struct brcms_info *wl, char *abbrev)
 	return regulatory_hint(wl->pub->ieee_hw->wiphy, abbrev);
 }
 
-static void brcms_dpc(unsigned long data)
+void brcms_dpc(unsigned long data)
 {
 	struct brcms_info *wl;
 
@@ -1430,7 +1430,7 @@ void brcms_down(struct brcms_info *wl)
 /*
 * precondition: perimeter lock is not acquired
  */
-static void _brcms_timer(struct brcms_timer *t)
+void brcms_timer(struct brcms_timer *t)
 {
 	LOCK(t->wl);
 
@@ -1454,9 +1454,9 @@ static void _brcms_timer(struct brcms_timer *t)
 /*
  * is called by the kernel from software irq context
  */
-static void brcms_timer(unsigned long data)
+static void _brcms_timer(unsigned long data)
 {
-	_brcms_timer((struct brcms_timer *) data);
+	brcms_timer((struct brcms_timer *) data);
 }
 
 /*
@@ -1477,7 +1477,7 @@ struct brcms_timer *brcms_init_timer(struct brcms_info *wl,
 
 	init_timer(&t->timer);
 	t->timer.data = (unsigned long) t;
-	t->timer.function = brcms_timer;
+	t->timer.function = _brcms_timer;
 	t->wl = wl;
 	t->fn = fn;
 	t->arg = arg;

drivers/staging/brcm80211/brcmsmac/mac80211_if.h

@@ -101,5 +101,7 @@ extern void brcms_add_timer(struct brcms_info *wl, struct brcms_timer *timer,
 			    uint ms, int periodic);
 extern bool brcms_del_timer(struct brcms_info *wl, struct brcms_timer *timer);
 extern void brcms_msleep(struct brcms_info *wl, uint ms);
+extern void brcms_dpc(unsigned long data);
+extern void brcms_timer(struct brcms_timer *t);
 
 #endif				/* _BRCM_MAC80211_IF_H_ */