ath10k: Add wrapper function to ath10k debug

ath10k_dbg() is called in ath10k_process_rx() with huge set of arguments
which is causing CPU overhead even when debug_mask is not set.
Good improvement was observed in the receive side performance when call
to ath10k_dbg() is avoided in the RX path.

Since currently all debug messages are sent via tracing infrastructure,
we cannot entirely avoid calling ath10k_dbg. Therefore, call to
ath10k_dbg() is made conditional based on tracing config in the driver.

Trasmit performance remains unchanged with this patch; below are some
experimental results with this patch and tracing disabled.

mesh mode:

		w/o this patch          with this patch
Traffic       TP      CPU Usage      TP      CPU usage

TCP          840Mbps    76.53%      960Mbps    78.14%
UDP          1030Mbps   74.58%      1132Mbps   74.31%

Infra mode:

		w/o this patch          with this patch
Traffic        TP      CPU Usage      TP      CPU usage

TCP Rx       1241Mbps   80.89%      1270Mbps   73.50%
UDP Rx       1433Mbps   81.77%      1472Mbps   72.80%

Tested platform	: IPQ8064
hardware used	: QCA9984
firmware ver	: ver 10.4-3.5.3-00057

Signed-off-by: Kan Yan <kyan@chromium.org>
Signed-off-by: Venkateswara Naralasetty <vnaralas@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

diff --git a/drivers/net/wireless/ath/ath10k/core.c b/drivers/net/wireless/ath/ath10k/core.c
index 61ef903..770ddc7 100644 (file)
--- a/drivers/net/wireless/ath/ath10k/core.c
+++ b/drivers/net/wireless/ath/ath10k/core.c
@@ -26,6 +26,8 @@
 #include "coredump.h"
 
 unsigned int ath10k_debug_mask;
+EXPORT_SYMBOL(ath10k_debug_mask);
+
 static unsigned int ath10k_cryptmode_param;
 static bool uart_print;
 static bool skip_otp;

diff --git a/drivers/net/wireless/ath/ath10k/debug.c b/drivers/net/wireless/ath/ath10k/debug.c
index 740781f..bd2b562 100644 (file)
--- a/drivers/net/wireless/ath/ath10k/debug.c
+++ b/drivers/net/wireless/ath/ath10k/debug.c
@@ -2664,8 +2664,8 @@ void ath10k_debug_unregister(struct ath10k *ar)
 #endif /* CONFIG_ATH10K_DEBUGFS */
 
 #ifdef CONFIG_ATH10K_DEBUG
-void ath10k_dbg(struct ath10k *ar, enum ath10k_debug_mask mask,
-               const char *fmt, ...)
+void __ath10k_dbg(struct ath10k *ar, enum ath10k_debug_mask mask,
+                 const char *fmt, ...)
 {
        struct va_format vaf;
        va_list args;
@@ -2682,7 +2682,7 @@ void ath10k_dbg(struct ath10k *ar, enum ath10k_debug_mask mask,
 
        va_end(args);
 }
-EXPORT_SYMBOL(ath10k_dbg);
+EXPORT_SYMBOL(__ath10k_dbg);
 
 void ath10k_dbg_dump(struct ath10k *ar,
                     enum ath10k_debug_mask mask,
@@ -2695,7 +2695,7 @@ void ath10k_dbg_dump(struct ath10k *ar,
 
        if (ath10k_debug_mask & mask) {
                if (msg)
-                       ath10k_dbg(ar, mask, "%s\n", msg);
+                       __ath10k_dbg(ar, mask, "%s\n", msg);
 
                for (ptr = buf; (ptr - buf) < len; ptr += 16) {
                        linebuflen = 0;

diff --git a/drivers/net/wireless/ath/ath10k/debug.h b/drivers/net/wireless/ath/ath10k/debug.h
index db78e85..a5b2039 100644 (file)
--- a/drivers/net/wireless/ath/ath10k/debug.h
+++ b/drivers/net/wireless/ath/ath10k/debug.h
@@ -240,18 +240,18 @@ void ath10k_sta_update_rx_tid_stats_ampdu(struct ath10k *ar,
 #endif /* CONFIG_MAC80211_DEBUGFS */
 
 #ifdef CONFIG_ATH10K_DEBUG
-__printf(3, 4) void ath10k_dbg(struct ath10k *ar,
-                              enum ath10k_debug_mask mask,
-                              const char *fmt, ...);
+__printf(3, 4) void __ath10k_dbg(struct ath10k *ar,
+                                enum ath10k_debug_mask mask,
+                                const char *fmt, ...);
 void ath10k_dbg_dump(struct ath10k *ar,
                     enum ath10k_debug_mask mask,
                     const char *msg, const char *prefix,
                     const void *buf, size_t len);
 #else /* CONFIG_ATH10K_DEBUG */
 
-static inline int ath10k_dbg(struct ath10k *ar,
-                            enum ath10k_debug_mask dbg_mask,
-                            const char *fmt, ...)
+static inline int __ath10k_dbg(struct ath10k *ar,
+                              enum ath10k_debug_mask dbg_mask,
+                              const char *fmt, ...)
 {
        return 0;
 }
@@ -263,4 +263,14 @@ static inline void ath10k_dbg_dump(struct ath10k *ar,
 {
 }
 #endif /* CONFIG_ATH10K_DEBUG */
+
+/* Avoid calling __ath10k_dbg() if debug_mask is not set and tracing
+ * disabled.
+ */
+#define ath10k_dbg(ar, dbg_mask, fmt, ...)                     \
+do {                                                           \
+       if ((ath10k_debug_mask & dbg_mask) ||                   \
+           trace_ath10k_log_dbg_enabled())                     \
+               __ath10k_dbg(ar, dbg_mask, fmt, ##__VA_ARGS__); \
+} while (0)
 #endif /* _DEBUG_H_ */

diff --git a/drivers/net/wireless/ath/ath10k/trace.c b/drivers/net/wireless/ath/ath10k/trace.c
index 3ecdff1..c7d4c97 100644 (file)
--- a/drivers/net/wireless/ath/ath10k/trace.c
+++ b/drivers/net/wireless/ath/ath10k/trace.c
@@ -7,3 +7,4 @@
 
 #define CREATE_TRACE_POINTS
 #include "trace.h"
+EXPORT_SYMBOL(__tracepoint_ath10k_log_dbg);

diff --git a/drivers/net/wireless/ath/ath10k/trace.h b/drivers/net/wireless/ath/ath10k/trace.h
index ba977bb..ab91645 100644 (file)
--- a/drivers/net/wireless/ath/ath10k/trace.h
+++ b/drivers/net/wireless/ath/ath10k/trace.h
@@ -29,7 +29,11 @@ static inline u32 ath10k_frm_hdr_len(const void *buf, size_t len)
 #if !defined(CONFIG_ATH10K_TRACING)
 #undef TRACE_EVENT
 #define TRACE_EVENT(name, proto, ...) \
-static inline void trace_ ## name(proto) {}
+static inline void trace_ ## name(proto) {} \
+static inline bool trace_##name##_enabled(void) \
+{                                              \
+       return false;                           \
+}
 #undef DECLARE_EVENT_CLASS
 #define DECLARE_EVENT_CLASS(...)
 #undef DEFINE_EVENT