ath6kl: add tracing support and tracing points for wmi packets

Add basic tracing infrastructure support to ath6kl and which can be
enabled with CONFIG_ATH6KL_TRACING.

Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>

6 files changed, 125 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath6kl/Kconfig b/drivers/net/wireless/ath/ath6kl/Kconfig
index 26c4b7220859..6971b7a395fe 100644
--- a/drivers/net/wireless/ath/ath6kl/Kconfig
+++ b/drivers/net/wireless/ath/ath6kl/Kconfig
@@ -31,6 +31,15 @@ config ATH6KL_DEBUG
         ---help---
           Enables debug support
 
+config ATH6KL_TRACING
+        bool "Atheros ath6kl tracing support"
+        depends on ATH6KL
+        depends on EVENT_TRACING
+        ---help---
+          Select this to ath6kl use tracing infrastructure.
+
+          If unsure, say Y to make it easier to debug problems.
+
 config ATH6KL_REGDOMAIN
         bool "Atheros ath6kl regdomain support"
         depends on ATH6KL
diff --git a/drivers/net/wireless/ath/ath6kl/Makefile b/drivers/net/wireless/ath/ath6kl/Makefile
index cab0ec0d5380..dc2b3b46781e 100644
--- a/drivers/net/wireless/ath/ath6kl/Makefile
+++ b/drivers/net/wireless/ath/ath6kl/Makefile
@@ -35,10 +35,15 @@ ath6kl_core-y += txrx.o
 ath6kl_core-y += wmi.o
 ath6kl_core-y += core.o
 ath6kl_core-y += recovery.o
+
 ath6kl_core-$(CONFIG_NL80211_TESTMODE) += testmode.o
+ath6kl_core-$(CONFIG_ATH6KL_TRACING) += trace.o
 
 obj-$(CONFIG_ATH6KL_SDIO) += ath6kl_sdio.o
 ath6kl_sdio-y += sdio.o
 
 obj-$(CONFIG_ATH6KL_USB) += ath6kl_usb.o
 ath6kl_usb-y += usb.o
+
+# for tracing framework to find trace.h
+CFLAGS_trace.o := -I$(src)
diff --git a/drivers/net/wireless/ath/ath6kl/trace.c b/drivers/net/wireless/ath/ath6kl/trace.c
new file mode 100644
index 000000000000..4118a29500c1
--- /dev/null
+++ b/drivers/net/wireless/ath/ath6kl/trace.c
@@ -0,0 +1,18 @@
+/*
+ * Copyright (c) 2012 Qualcomm Atheros, Inc.
+ *
+ * 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.
+ */
+
+#define CREATE_TRACE_POINTS
+#include "trace.h"
diff --git a/drivers/net/wireless/ath/ath6kl/trace.h b/drivers/net/wireless/ath/ath6kl/trace.h
new file mode 100644
index 000000000000..07876190ce05
--- /dev/null
+++ b/drivers/net/wireless/ath/ath6kl/trace.h
@@ -0,0 +1,87 @@
+#if !defined(_ATH6KL_TRACE_H) || defined(TRACE_HEADER_MULTI_READ)
+
+#include <net/cfg80211.h>
+#include <linux/skbuff.h>
+#include <linux/tracepoint.h>
+#include "wmi.h"
+
+#if !defined(_ATH6KL_TRACE_H)
+static inline unsigned int ath6kl_get_wmi_id(void *buf, size_t buf_len)
+{
+        struct wmi_cmd_hdr *hdr = buf;
+
+        if (buf_len < sizeof(*hdr))
+                return 0;
+
+        return le16_to_cpu(hdr->cmd_id);
+}
+#endif /* __ATH6KL_TRACE_H */
+
+#define _ATH6KL_TRACE_H
+
+/* create empty functions when tracing is disabled */
+#if !defined(CONFIG_ATH6KL_TRACING)
+#undef TRACE_EVENT
+#define TRACE_EVENT(name, proto, ...) \
+static inline void trace_ ## name(proto) {}
+#endif /* !CONFIG_ATH6KL_TRACING || __CHECKER__ */
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM ath6kl
+
+TRACE_EVENT(ath6kl_wmi_cmd,
+        TP_PROTO(void *buf, size_t buf_len),
+
+        TP_ARGS(buf, buf_len),
+
+        TP_STRUCT__entry(
+                __field(unsigned int, id)
+                __field(size_t, buf_len)
+                __dynamic_array(u8, buf, buf_len)
+        ),
+
+        TP_fast_assign(
+                __entry->id = ath6kl_get_wmi_id(buf, buf_len);
+                __entry->buf_len = buf_len;
+                memcpy(__get_dynamic_array(buf), buf, buf_len);
+        ),
+
+        TP_printk(
+                "id %d len %d",
+                __entry->id, __entry->buf_len
+        )
+);
+
+TRACE_EVENT(ath6kl_wmi_event,
+        TP_PROTO(void *buf, size_t buf_len),
+
+        TP_ARGS(buf, buf_len),
+
+        TP_STRUCT__entry(
+                __field(unsigned int, id)
+                __field(size_t, buf_len)
+                __dynamic_array(u8, buf, buf_len)
+        ),
+
+        TP_fast_assign(
+                __entry->id = ath6kl_get_wmi_id(buf, buf_len);
+                __entry->buf_len = buf_len;
+                memcpy(__get_dynamic_array(buf), buf, buf_len);
+        ),
+
+        TP_printk(
+                "id %d len %d",
+                __entry->id, __entry->buf_len
+        )
+);
+
+#endif /* _ ATH6KL_TRACE_H || TRACE_HEADER_MULTI_READ*/
+
+/* we don't want to use include/trace/events */
+#undef TRACE_INCLUDE_PATH
+#define TRACE_INCLUDE_PATH .
+#undef TRACE_INCLUDE_FILE
+#define TRACE_INCLUDE_FILE trace
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
diff --git a/drivers/net/wireless/ath/ath6kl/txrx.c b/drivers/net/wireless/ath/ath6kl/txrx.c
index 78b369286579..43dbdaadf577 100644
--- a/drivers/net/wireless/ath/ath6kl/txrx.c
+++ b/drivers/net/wireless/ath/ath6kl/txrx.c
@@ -20,6 +20,7 @@
 #include "core.h"
 #include "debug.h"
 #include "htc-ops.h"
+#include "trace.h"
 
 /*
  * tid - tid_mux0..tid_mux3
@@ -288,6 +289,8 @@ int ath6kl_control_tx(void *devt, struct sk_buff *skb,
         int status = 0;
         struct ath6kl_cookie *cookie = NULL;
 
+        trace_ath6kl_wmi_cmd(skb->data, skb->len);
+
         if (WARN_ON_ONCE(ar->state == ATH6KL_STATE_WOW)) {
                 dev_kfree_skb(skb);
                 return -EACCES;
diff --git a/drivers/net/wireless/ath/ath6kl/wmi.c b/drivers/net/wireless/ath/ath6kl/wmi.c
index d76b5bd81a0d..31a308103f4c 100644
--- a/drivers/net/wireless/ath/ath6kl/wmi.c
+++ b/drivers/net/wireless/ath/ath6kl/wmi.c
@@ -20,6 +20,7 @@
 #include "core.h"
 #include "debug.h"
 #include "testmode.h"
+#include "trace.h"
 #include "../regd.h"
 #include "../regd_common.h"
 
@@ -4086,6 +4087,8 @@ int ath6kl_wmi_control_rx(struct wmi *wmi, struct sk_buff *skb)
                 return -EINVAL;
         }
 
+        trace_ath6kl_wmi_event(skb->data, skb->len);
+
         return ath6kl_wmi_proc_events(wmi, skb);
 }