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In PCM interface/protocol for userspace, parameters of runtime for PCM substream is decided by an interaction between applications and ALSA PCM core. In former commits, some tracepoints were added to probe a part of the interaction. This commit adds a documentation about the interaction and the tracepoints. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Signed-off-by: Takashi Iwai <tiwai@suse.de>