diff options
| author | Takashi Sakamoto <o-takashi@sakamocchi.jp> | 2017-06-07 08:46:43 +0900 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2017-06-07 10:48:56 +0200 |
| commit | be4e31dab0e14c1f6fa5c03b33056058b93316e2 (patch) | |
| tree | b959f6ae7e69de8948fa1c2536d6aea6bd2a57ed /sound/core/pcm_native.c | |
| parent | d7f910bfedd863d13ea320030fe98e42d0938ed5 (diff) | |
ALSA: pcm: tracepoints for refining PCM parameters
When working for devices which support configurable modes for its data
transmission or which consists of several components, developers are
likely to use rules of parameters of PCM substream. However, there's no
infrastructure to assist their work.
In old days, ALSA PCM core got a local 'RULES_DEBUG' macro to debug
refinement of parameters for PCM substream. Although this is merely a
makeshift. With some modifications, we get the infrastructure.
This commit is for the purpose. Refinement of mask/interval type of
PCM parameters is probed as tracepoint events as 'hw_mask_param' and
'hw_interval_param' on existent 'snd_pcm' subsystem.
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/core/pcm_native.c')
| -rw-r--r-- | sound/core/pcm_native.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c index bf5d0f2acfb9..b98b3ccde4f0 100644 --- a/sound/core/pcm_native.c +++ b/sound/core/pcm_native.c @@ -39,6 +39,9 @@ #include "pcm_local.h" +#define CREATE_TRACE_POINTS +#include "pcm_param_trace.h" + /* * Compatibility */ @@ -279,6 +282,9 @@ int snd_pcm_hw_refine(struct snd_pcm_substream *substream, unsigned int stamp = 2; int changed, again; + struct snd_mask __maybe_unused old_mask; + struct snd_interval __maybe_unused old_interval; + params->info = 0; params->fifo_size = 0; if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS)) @@ -294,6 +300,9 @@ int snd_pcm_hw_refine(struct snd_pcm_substream *substream, return -EINVAL; if (!(params->rmask & (1 << k))) continue; + + if (trace_hw_mask_param_enabled()) + old_mask = *m; #ifdef RULES_DEBUG pr_debug("%s = ", snd_pcm_hw_param_names[k]); pr_cont("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]); @@ -302,6 +311,8 @@ int snd_pcm_hw_refine(struct snd_pcm_substream *substream, #ifdef RULES_DEBUG pr_cont("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]); #endif + trace_hw_mask_param(substream, k, 0, &old_mask, m); + if (changed) params->cmask |= 1 << k; if (changed < 0) @@ -314,6 +325,9 @@ int snd_pcm_hw_refine(struct snd_pcm_substream *substream, return -EINVAL; if (!(params->rmask & (1 << k))) continue; + + if (trace_hw_interval_param_enabled()) + old_interval = *i; #ifdef RULES_DEBUG pr_debug("%s = ", snd_pcm_hw_param_names[k]); if (i->empty) @@ -333,6 +347,8 @@ int snd_pcm_hw_refine(struct snd_pcm_substream *substream, i->openmin ? '(' : '[', i->min, i->max, i->openmax ? ')' : ']'); #endif + trace_hw_interval_param(substream, k, 0, &old_interval, i); + if (changed) params->cmask |= 1 << k; if (changed < 0) @@ -359,6 +375,15 @@ int snd_pcm_hw_refine(struct snd_pcm_substream *substream, } if (!doit) continue; + + if (trace_hw_mask_param_enabled()) { + if (hw_is_mask(r->var)) + old_mask = *hw_param_mask(params, r->var); + } + if (trace_hw_interval_param_enabled()) { + if (hw_is_interval(r->var)) + old_interval = *hw_param_interval(params, r->var); + } #ifdef RULES_DEBUG pr_debug("Rule %d [%p]: ", k, r->func); if (r->var >= 0) { @@ -394,6 +419,14 @@ int snd_pcm_hw_refine(struct snd_pcm_substream *substream, } pr_cont("\n"); #endif + if (hw_is_mask(r->var)) { + trace_hw_mask_param(substream, r->var, k + 1, + &old_mask, hw_param_mask(params, r->var)); + } + if (hw_is_interval(r->var)) { + trace_hw_interval_param(substream, r->var, k + 1, + &old_interval, hw_param_interval(params, r->var)); + } rstamps[k] = stamp; if (changed && r->var >= 0) { params->cmask |= (1 << r->var); |