ALSA: sound, core, pcm_lib: xrun_log: log also in_interrupt
When debugging pcm drivers I found the "period" or "hw" prefix printed
by either XRUN_DEBUG_PERIODUPDATE or XRUN_DEBUG_PERIODUPDATE events,
respectively to be very useful is observing the interplay between
interrupt-context updates and syscall-context updates.
Similarly, when debugging overruns with XRUN_DEBUG_LOG it is useful to
see the context of the last 10 positions.
Add an in_interrupt member to hwptr_log_entry which stores the value of
the in_interrupt parameter of snd_pcm_update_hw_ptr0 when the log entry
is created. Print a "[Q]" prefix when dumping the log entries if
in_interrupt was true.
Signed-off-by: Ben Gardiner <bengardiner@nanometrics.ca>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c
index 64449cb..c8c8091 100644
--- a/sound/core/pcm_lib.c
+++ b/sound/core/pcm_lib.c
@@ -189,6 +189,7 @@
#define XRUN_LOG_CNT 10
struct hwptr_log_entry {
+ unsigned int in_interrupt;
unsigned long jiffies;
snd_pcm_uframes_t pos;
snd_pcm_uframes_t period_size;
@@ -204,7 +205,7 @@
};
static void xrun_log(struct snd_pcm_substream *substream,
- snd_pcm_uframes_t pos)
+ snd_pcm_uframes_t pos, int in_interrupt)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct snd_pcm_hwptr_log *log = runtime->hwptr_log;
@@ -220,6 +221,7 @@
return;
}
entry = &log->entries[log->idx];
+ entry->in_interrupt = in_interrupt;
entry->jiffies = jiffies;
entry->pos = pos;
entry->period_size = runtime->period_size;
@@ -246,9 +248,11 @@
entry = &log->entries[idx];
if (entry->period_size == 0)
break;
- snd_printd("hwptr log: %s: j=%lu, pos=%ld/%ld/%ld, "
+ snd_printd("hwptr log: %s: %sj=%lu, pos=%ld/%ld/%ld, "
"hwptr=%ld/%ld\n",
- name, entry->jiffies, (unsigned long)entry->pos,
+ name, entry->in_interrupt ? "[Q] " : "",
+ entry->jiffies,
+ (unsigned long)entry->pos,
(unsigned long)entry->period_size,
(unsigned long)entry->buffer_size,
(unsigned long)entry->old_hw_ptr,
@@ -326,7 +330,7 @@
}
pos -= pos % runtime->min_align;
if (xrun_debug(substream, XRUN_DEBUG_LOG))
- xrun_log(substream, pos);
+ xrun_log(substream, pos, in_interrupt);
hw_base = runtime->hw_ptr_base;
new_hw_ptr = hw_base + pos;
if (in_interrupt) {