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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>
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7cdd8d7313
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1 changed files with 8 additions and 4 deletions
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@ -189,6 +189,7 @@ static void xrun(struct snd_pcm_substream *substream)
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#define XRUN_LOG_CNT 10
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struct hwptr_log_entry {
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unsigned int in_interrupt;
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unsigned long jiffies;
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snd_pcm_uframes_t pos;
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snd_pcm_uframes_t period_size;
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@ -204,7 +205,7 @@ struct snd_pcm_hwptr_log {
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};
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static void xrun_log(struct snd_pcm_substream *substream,
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snd_pcm_uframes_t pos)
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snd_pcm_uframes_t pos, int in_interrupt)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct snd_pcm_hwptr_log *log = runtime->hwptr_log;
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@ -220,6 +221,7 @@ static void xrun_log(struct snd_pcm_substream *substream,
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return;
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}
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entry = &log->entries[log->idx];
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entry->in_interrupt = in_interrupt;
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entry->jiffies = jiffies;
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entry->pos = pos;
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entry->period_size = runtime->period_size;
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@ -246,9 +248,11 @@ static void xrun_log_show(struct snd_pcm_substream *substream)
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entry = &log->entries[idx];
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if (entry->period_size == 0)
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break;
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snd_printd("hwptr log: %s: j=%lu, pos=%ld/%ld/%ld, "
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snd_printd("hwptr log: %s: %sj=%lu, pos=%ld/%ld/%ld, "
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"hwptr=%ld/%ld\n",
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name, entry->jiffies, (unsigned long)entry->pos,
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name, entry->in_interrupt ? "[Q] " : "",
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entry->jiffies,
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(unsigned long)entry->pos,
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(unsigned long)entry->period_size,
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(unsigned long)entry->buffer_size,
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(unsigned long)entry->old_hw_ptr,
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@ -326,7 +330,7 @@ static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream,
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}
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pos -= pos % runtime->min_align;
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if (xrun_debug(substream, XRUN_DEBUG_LOG))
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xrun_log(substream, pos);
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xrun_log(substream, pos, in_interrupt);
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hw_base = runtime->hw_ptr_base;
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new_hw_ptr = hw_base + pos;
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if (in_interrupt) {
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