ALSA: hda - Add tracepoints to HD-audio controller driver

Add a couple of tracepoints to snd-hda-intel for tracing the position
and the trigger timings.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/hda/Makefile

@@ -8,6 +8,7 @@ snd-hda-codec-$(CONFIG_SND_HDA_INPUT_BEEP) += hda_beep.o
 
 # for trace-points
 CFLAGS_hda_codec.o := -I$(src)
+CFLAGS_hda_intel.o := -I$(src)
 
 snd-hda-codec-realtek-objs :=	patch_realtek.o
 snd-hda-codec-cmedia-objs :=	patch_cmedia.o

sound/pci/hda/hda_intel.c

@@ -527,6 +527,9 @@ struct azx {
 	struct list_head list;
 };
 
+#define CREATE_TRACE_POINTS
+#include "hda_intel_trace.h"
+
 /* driver types */
 enum {
 	AZX_DRIVER_ICH,
@@ -2059,6 +2062,9 @@ static int azx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 	int rstart = 0, start, nsync = 0, sbits = 0;
 	int nwait, timeout;
 
+	azx_dev = get_azx_dev(substream);
+	trace_azx_pcm_trigger(chip, azx_dev, cmd);
+
 	switch (cmd) {
 	case SNDRV_PCM_TRIGGER_START:
 		rstart = 1;
@@ -2231,6 +2237,7 @@ static unsigned int azx_get_position(struct azx *chip,
 {
 	unsigned int pos;
 	int stream = azx_dev->substream->stream;
+	int delay = 0;
 
 	switch (chip->position_fix[stream]) {
 	case POS_FIX_LPIB:
@@ -2264,7 +2271,6 @@ static unsigned int azx_get_position(struct azx *chip,
 	    chip->position_fix[stream] == POS_FIX_POSBUF &&
 	    (chip->driver_caps & AZX_DCAPS_COUNT_LPIB_DELAY)) {
 		unsigned int lpib_pos = azx_sd_readl(azx_dev, SD_LPIB);
-		int delay;
 		if (stream == SNDRV_PCM_STREAM_PLAYBACK)
 			delay = pos - lpib_pos;
 		else
@@ -2279,6 +2285,7 @@ static unsigned int azx_get_position(struct azx *chip,
 		azx_dev->substream->runtime->delay =
 			bytes_to_frames(azx_dev->substream->runtime, delay);
 	}
+	trace_azx_get_position(chip, azx_dev, pos, delay);
 	return pos;
 }
 

sound/pci/hda/hda_intel_trace.h

@@ -0,0 +1,62 @@
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM hda_intel
+#define TRACE_INCLUDE_FILE hda_intel_trace
+
+#if !defined(_TRACE_HDA_INTEL_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_HDA_INTEL_H
+
+#include <linux/tracepoint.h>
+
+struct azx;
+struct azx_dev;
+
+TRACE_EVENT(azx_pcm_trigger,
+
+	TP_PROTO(struct azx *chip, struct azx_dev *dev, int cmd),
+
+	TP_ARGS(chip, dev, cmd),
+
+	TP_STRUCT__entry(
+		__field( int, card )
+		__field( int, idx )
+		__field( int, cmd )
+	),
+
+	TP_fast_assign(
+		__entry->card = (chip)->card->number;
+		__entry->idx = (dev)->index;
+		__entry->cmd = cmd;
+	),
+
+	TP_printk("[%d:%d] cmd=%d", __entry->card, __entry->idx, __entry->cmd)
+);
+
+TRACE_EVENT(azx_get_position,
+
+    TP_PROTO(struct azx *chip, struct azx_dev *dev, unsigned int pos, unsigned int delay),
+
+	    TP_ARGS(chip, dev, pos, delay),
+
+	TP_STRUCT__entry(
+		__field( int, card )
+		__field( int, idx )
+		__field( unsigned int, pos )
+		__field( unsigned int, delay )
+	),
+
+	TP_fast_assign(
+		__entry->card = (chip)->card->number;
+		__entry->idx = (dev)->index;
+		__entry->pos = pos;
+		__entry->delay = delay;
+	),
+
+	TP_printk("[%d:%d] pos=%u, delay=%u", __entry->card, __entry->idx, __entry->pos, __entry->delay)
+);
+
+#endif /* _TRACE_HDA_INTEL_H */
+
+/* This part must be outside protection */
+#undef TRACE_INCLUDE_PATH
+#define TRACE_INCLUDE_PATH .
+#include <trace/define_trace.h>